DE723936C - Device for taking samples - Google Patents

Description

Device for taking samples The invention relates to a device which is used to take samples from a belt conveyor 0. Like. Delivered goods, in particular hard coal, is determined.

There are facilities for taking samples from a good or Turbidity jet known, in which a circumferential collecting vessel in a horizontal plane is provided.

This is coupled to the drive by a helical spring. Short A stop is placed in front of the point where the collecting vessel has reached the jet, which holds the collecting vessel in place while the spring is tensioned at the same time. After a the lock is released automatically after a certain time, whereupon the collecting vessel through the good or turbidity jet shoots through. The good or the cloudy, which thereby arise hits the side wall of the collecting vessel, is knocked out of the jet, splashes around and - pollutes the sampler environment.

A sampler has also been described in which a diversion chute is attached to a vertical shaft. This is frictionally connected to an electric motor in connection, in the circuit of which a changeover switch is provided. By a mechanical Transmission is the changeover switch every time the diversion chute through the stream of goods has passed through, operated independently and thereby the direction of rotation of the motor reversed. This sampler requires a complicated mechanical transmission. In addition, it is the speed at which the deflection chute moves through the flow of goods is, relatively small, because of the positive connection between the deflection chute and motor, large acceleration forces at the start and end of the movement are avoided have to.

In a further known device for taking samples is a diverting chute that runs straight through a freely sloping flow of material is attached to a rocker arm that can be moved in a vertical plane. This is through a change gear that is automatically controlled, non-positive with connected to a uniformly driven pulley. This facility too is very complicated and the swing movement due to the frictional connection also only slightly.

The invention avoids the nuisance of these known devices by the fact that?> the rocker arm can be moved between two fixed stops and is attached to the upper extension is overweight beyond its pivot point and that a periodically actuated device is provided on each side of the rocker is that the rocker alternately gives a shock, so that these each off one is brought into the other end position.

In the drawing is an exemplary device according to the invention shown, namely Fig. I shows a side view of the sampler, Fig. 2 a section along the line A-J of Fig. 1, Fig. 3 a plan for Fig. I, Fig. 4, 5 and 6 different positions of the sampler during operation, Fig. Figure 7 shows a diversion chute on a larger scale and in perspective.

A housing a covers one of the rocker arm b and the crank c existing centric crank loop. The pin d of the crank c is in an the swing arm incorporated backdrop. The crank is fixed with an angle lever f connected, which is displaced on the axis. At the bottom of the swing arm is a diversion chute h attached. The diversion chute is through the side walls h1, and 112 (Fig. 7) limited and designed to be open at the top and at the rear.

The rocker is extended upwards over its pivot point i and carries at the upper end an overweight k, which between the two fixed stops b1. b2 is movable. There is a stop block at each of the free arm ends f1 and J2 of the angle lever f m1 or SZ2 attached. A pendulum n is also rotatably arranged about the crank axis g. This pendulum carries a sliding weight p at the free end, which between the stops o and oil (Fig. I) is displaceable. Another crank is on the crank axis g r rotatably mounted, the crank pin s of which protrudes into the range of motion of the pendulum. The crank r is designed as a worm wheel, which with the worm (Fig. 2) in Engagement is. A ratchet sits on the worm shaft kl outside the housing a t, in which the latch u engages. The I (on the left stands with a push rod v an eccentric w in connection, which is on the shaft x of the limlenkrolle y at the throwing end a belt conveyor is attached.

In Figs. 1 to 3 the deflection chute is in the left one Quiet and turning point. In this position, the arm J1 of the Willlielhebelsf is with the Block m1 in standby position. The weight p lies on the inner stop o, on.

During the conveyor operation, the worm gear is designed Crank r set in slow turns; the crank pin s takes the pendulum n with. When the crank pin moves the pendulum a little beyond the upper middle position it falls down freely and the sliding weight p hits the block on the lever arm (dot-dash position in Fig. 2). The blow given will the arm J1 carried along by the pendulum weight. The crank turns c and forces the swing arm to deflect b. The pendulum weight is such that whose kinetic and potential energy pushes the rocker beyond its central position promoted. Once over. brought out the central position, the rocker is of the Overweight k pulled into the right turning and resting position (Fig. 4 and,), in the the excess weight rests against the stop b2.

During the movement process, the sliding weight p slips after it has been reached a corresponding inclination of the pendulum 11 to the outside and lies on the Stop o on.

This means that the sliding weight is outside the contact area the blocks m1 and> 112 and comes to temporarily in its lower middle position Standstill (Fig. 4).

The deflection chute moves with the swing deflection with great Speed across the flow of material falling from the discharge roller y of the conveyor. The entrance opening of the diversion chute is dimensioned in this way. that they move with you Security covers the entire cross section of the material flow, so that the removed Samples also the actual composition and nature of the funded Reproduce good. The goods falling into the chute from above are turned towards the rear derived into box c. The catch is located under the chute and can be removed and is emptied after each swing or after several swing and put back in its place.

As soon as the crank pin s has caught up with the pendulum again, it will up in the in oj. 5 position shown.

If the pendulum is now a little wider, i.e. H. from the central position moved out, it falls down again freely and leads the next - swinging movement a. With this swingarm The deflection chute moves exactly as it should lt from right to left through the falling material flow and removes it in the a -new sample. Here the pin d must be the larger lower one Run through the crank circuit. For this reason it is advisable to take precautions to ensure that the pendulum remains in contact with the arm for as long as possible, which is now in the position previously held by the arm. This is because of this achieves that the block nt2 is pointed in a wedge shape and in a notch of the sliding weight p engages (dash-dotted pendulum position in Fig. 5).

With this configuration, the sliding weight remains above the lower one The middle position of the pendulum n is in contact with the block and only then slides outwards to the stop o when the pendulum swings back, whereupon it is at its deepest Situation comes to a standstill (Fig. 6). Because of the falling weight given force impulse, the rocker arm is in turn brought out via its central position and pulled by the excess weight into the wrapping layer in which it is attached to the log bt creates. The crank pin s moves the pendulum back out of the lower middle position into the upper middle position, whereby the sampler again the in the Fig. I and 2 assumes the initial position shown.

The chronological sequence of the Schwingenhewegung and thus the Sampling is determined by the rotation time of the crank pin. This time can go through at will. the choice of gear ratio and the respective To be adapted to the circumstances.

In the device according to the invention it is possible to use the rocker with the diversion chute in a shaft with completely closed side walls to accommodate, so that pollution of the environment is avoided.

Claims (2)

PATENT CLAIMS: I. Apparatus for taking samples from a on belt conveyors 0 a deflection chute attached to a rocker arm that can be moved in a vertical plane is passed transversely through the freely falling crop flow, characterized in that, that the rocker (b) between two fixed stops (b1, b2) movable and on the The upper extension is provided with an excess weight (k) beyond its pivot point (i) is and that a periodically operated device is provided on each side of the rocker is that the rocker alternately gives a shock, so that these each off one is brought into the other end position. 2. Apparatus according to claim I, characterized in that the rocker (b) is provided with a gate (e) in which the pin (d) of a crank (c) is guided is that the crank is firmly connected to an equiaxed angle lever, that on the crank axle (g) a temporarily driven by another crank (r), with a sliding weight (p) provided pendulum (> t) is arranged such that the sliding weight when the pendulum falls from the upper middle position opens one arm (each or 2) of the angle lever, initially takes it along and approximately in the lowest pendulum position slips outwards, causing the pendulum to move the contact area of the angle lever arrives, and that the arms of the angle lever are offset from one another so that a lever arm in each end position of the rocker in standby position to take up the sliding weight falling with the pendulum stands.