DE3246332A1 - DEVICE FOR REGULATING THE FILLING DEGREE OF THE REMOVAL ELEMENTS OF A BUCKET CHAIN EXCAVATOR FOR GRAINY OR POWDERED SUBSTANCES - Google Patents

Description

Device for regulating the degree of filling of a bucket ladder dredger for granular or powdery substances This method and apparatus are the removal elements preferably a · .. ..- Eimerkettenbagger used "for the. the removal, conveyance and delivery of various aggregates (sand, gravel, etc.) from their stockpile storage locations to the weighing station of a concrete mixing plant »

Some known, non-lifting, horizontally movable bucket chain excavators consist of a frame that is opposite a supporting structure can be moved laterally and is connected to a drive device for lateral movement, which enables at least one heap To approach stored goods, and on the three sockets (disks or pinions), which are arranged at the tips of an obtuse triangle, at least one endless chain is removed, which, driven by a drive device, rotates and on which the buckets or scraper blades are attached, with their front edge on the horizontal leg of the obtuse angle along the floor and on the other leg of the obtuse angle along the slope of the heap or along a sloping ramp.

In general, this frame is rotatable about a significantly vertical one Axis is mounted and is moved by a drive motor or hydraulic actuating cylinder, which makes it possible to move two piles of aggregates, the first one consisting of sand, for example, the second one consisting of gravel .

In any case - regardless of whether the lateral offset of the bucket chain excavator takes place by pivoting or moving and whether this bucket chain excavator only approaches one pile or two piles one after the other - It is important that the bucket chain excavator constantly provides sufficient thrust on the aggregates to be removed exercises so that the removal elements (buckets or scraper shovels) fill correctly and sufficiently to achieve the required throughput to ensure.

An improvement developed for this type of bucket chain excavator is the subject of the application for the French patent No. 81 06665 of April 2, 1981 and makes it possible to operate this bucket chain excavator with exceptional allocation and weighing accuracy.

Because with the not improved bucket chain excavators, the chains run always in the same direction so that the removal elements (bucket

or scraper shovels) every time the bucket ladder excavator has a new one Heap attacks always contain residues of the aggregates from the previous heap. In order to achieve a perfect dosage, the aforementioned extraction elements would have to be empty at this point in time; this can be achieved by the aforementioned improvement will.

According to this improvement is the running direction of the chain drive device reversible so that the buckets or scraper shovels

- circulate in forward direction to a certain amount from a heap remove, drive up the embankment and load the mixing plant, and

- when swiveling the bucket chain excavator backwards to the other heap run around in order to drive down the embankment and empty its contents before the other heap is reached, which it then tackle in the forward run.

Whether it is a bucket chain excavator with buckets or scraper shovels is whether this bucket ladder excavator can be moved laterally by pivoting or moving, whether this lateral offset it enables one or two heaps to be approached, whether such a bucket chain excavator only in the forward direction or whether it works in both directions, whether the drive unit in the latter case is below and behind or arranged above and in front - that is not so important. Because and that has already been mentioned above - the bucket chain excavator must constantly exert a certain pressure on the pile of aggregates to be removed via the drive device for lateral movement, so that the buckets or scraper shovels fill properly. This pressure is essentially variable and of a very great magnitude Depends on the number of parameters that are impossible to get a grip on.

In practice, you will find that the buckets or scraper shovels only fill incompletely if the pressure exerted by the bucket ladder excavator during sideways movement is too low for them to oppose it Overfill if the pressure is too high that the conveyor of the bucket excavator clogs and that of the bucket circulating or scraper blades slide on the drive sockets.

The user is therefore forced to constantly rely on the control of the drive device, which causes the bucket chain excavator to move sideways,

To influence. For example, this drive device consists of a hydraulic motor or a hydraulic cylinder, the user must ceaselessly readjust the pressure and speed valves of the hydraulics, despite the increasing or decreasing resistance of the aggregates to achieve even work.

This readjustment by hand, to which the user is constantly forced is a burden, and even if properly readjusted while the bucket excavator is in operation, the result is but not always fully satisfactory, since the throughput is never even and constant, i.e. never optimal.

The present invention aims to remedy this drawback by eliminating the need for manual intervention and by incorporating extremely simple automation, which is essentially can be attached to the bucket chain excavator and makes it possible to achieve the desired uniform throughput. In addition, is This automatic system means that the machine will no longer come to a standstill due to excessive filling of the buckets or scraper shovels, and the Dead times are still reduced by the fact that now many other processes during the lateral movement of the bucket chain excavator from one Stockpile to another can be carried out.

In order to achieve this aim, a special one is used according to this invention Control device comprising:

- A detector device that detects changes in the deflection of the ascending front strands of the chain or chains depending on the filling level of the buckets or scraper shovels or on changes the swivel position of the buckets when driving up along the same embankment responds due to their filling level, and

- An actuation device, 'which has a trigger that has a reference value defines, on the one hand with the upstream detector device and on the other hand with the downstream drive device cooperates, which makes it possible to move the bucket chain excavator sideways.

In a particularly advantageous embodiment, the detector device has at least one rotating element, such as a pinion, a roller or the like, which opposes the ascending front run the chain or chains or on the conveyor line the bucket between the upper and lower nut (Oberturas and Unterturas) of this strand

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arranged and movably mounted on a holder that, to his To ensure mobility with respect to the frame, guided and preferably is designed as a rocker arm.

The actuator consists of a trigger such as a Microcontact, a distributor, a pedal or other, its movable Scanning part interacts with the detector device, regardless of the type thereof, and its active control part with the drive device is connected via transmission elements such as electrical cables, lines, mechanical linkages or other, depending on whether this drive device works electrically, hydraulically or pneumatically, mechanically or in any other way. Various other features and advantages of the invention will also emerge from the following detailed description. As non-limiting examples, some embodiments of the subject matter of the invention are shown in the accompanying drawings. This drawing shows:

Fig. 1 is a side view of a concrete mixing plant, equipped with a bucket chain excavator, in which the control device, the object of the invention, can be used, Fig. 2 is a schematic view in which - more specifically a Bucket chain excavator is shown, in which two versions of the control device can be used,

3 and 4 are schematic views in which the bucket chain excavator from Fig. 2 the first embodiment of the control device and a variant are shown,

5 shows a partial view of FIGS. 3 and 4 on a larger scale to emphasize the control device,

6 and 7 are analogous views of FIGS. 3 and 5, showing the second embodiment of the control device used on a Bucket excavator, represent.

The concrete mixing plant according to FIG. 1 consists of a supporting structure 1, on which a mixing drum 2 is removed, to the opening of which a distribution chute 3 leads, via a weighing container 4 and a Weighing hopper 5 is fed.

The bunker 5 receives the cement, which is discharged by a discharge screw 6 is withdrawn from a silo 7, which rests on the support structure 1; the weight is displayed on a counter 8.

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The container 4 receives the aggregates by gravity exit from the collecting bunker 9, which is from a bucket chain excavator is fed. This is able to remove certain amounts of different aggregates such as sand or gravel from the two heaps 11 and (Fig. 1} can be seen. The weight picked up by container 4 is displayed on a counter 13.

The bucket chain excavator 10 consists of a frame 14, which is opposite of the supporting structure 1 about two vertically aligned axes 15, 16 is pivotably mounted. The frame 14 is provided with a drive device for its pivoting movement, e.g. a gear motor 17.

The concrete mixing drum 2 is also equipped with a water nozzle which does not appear on the drawing and the flow rate of which is indicated by a meter.
The present invention relates to improvements added to this bucket ladder excavator 10. As can be seen from Fig. 2, the frame 14 of this bucket chain excavator is simplified and consists of a lower rod 19, an inclined rod 20 rising towards the front and a rod 21 which connects the first two together and thus forms a triangle. Three nuts (pinions) 22 to 24 are rotatably mounted on the ends of the rods 19, 20 and are thus located at the tips of an obtuse triangle. Each nut has two rollers for guiding the two chains 25 and 26, which run parallel to one another and are connected to one another in the transverse direction by buckets 27 (. "Fig. 1) or scraper blades 28 (Fig. 2).

The grooves of the nuts may be hollowed out to ensure a safe one To enable the chains to be taken along, regardless of whether they are link, plate or other chains.

The front oblique strand A of the chain 25, the one upwards and forwards is directed, is advantageously supplemented by a stationary inclined ramp 29 which is carried by the frame 14 and parallel to Trumm A is inclined. In this case, the front edge of the bucket or scraper shovels along this inclined ramp, like that that small, mobile piles of aggregates collect in the buckets or against the scraper blades, which normally after conveyed above and thrown into the collecting bunker 9 in the upper area of the conveyor line.

As Fig. 1 now shows, the circulating drive of the chains 25 and taken over by a gear motor and reversing system 42, which is based on the

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inclined rod 20 of the frame is mounted. The driving pinion 43 this system is connected via a power transmission 44 to the driven pinion 45 which is coupled to the front upper nut 23.

The two versions of the control device described below relate to the bucket chain excavator type described above, but can of course also be used for other types.

These versions of the control device work according to a method which consists in automatically driving into the stockpile from the side, to bring the heap to collapse by pushing the bucket chain excavator perpendicular to the direction of rotation of the removal elements, as long as the Extraction elements are not yet sufficiently filled, and this thrust to be weakened or interrupted when the degree of filling is within optimal limits. Since this system works automatically, there is no need Manual intervention and the throughput of the bucket chain excavator remains constant with optimum efficiency.

The control device further comprises a detector device, which on Changes in the deflection of the ascending front strand A of Chain or chains 25, 26 depending on the degree of filling of the buckets or scraper blades or on changes in the pivoting position of the buckets responds when driving up along the same embankment due to its degree of filling. It also includes an actuator that has a Trigger, which defines a reference value with which the change is compared, on the one hand with the upstream detector device and on the other hand cooperates with the downstream drive device 17, which makes it possible to close the bucket chain excavator laterally procedure.

According to the first embodiment shown in FIGS. 3 to 5, the detector device responds to changes in the deflection 52 of the ascending front strand A of the chains 25 and 26 depending on the degree of filling of the buckets 27 or the scratching blades 28.

In the example shown in Fig. 4, the deflection is at a single point between the nuts 22, 23 and preferably recorded at a third of the height. In this case, the detector device has a follower roller 53, which rests against the strand A and is movably mounted on a holder that, to its mobility to ensure against the frame, is performed so that they can move away from the strand or approach it. In this example

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the roller 53, which is replaced by a pinion, a nut or the like can be movably mounted on the end of a lever 54, which in turn is rotatable about an axis 55 of an iron 56, the is positively connected to the frame. Furthermore, an extension of the lever 54 works together with a microcontact 57 that opens the iron 56 is arranged. If the deflection of strand A reinforced by the chain, so the lever 54 tilts. Since this deflection depends on the filling level of the buckets or scraper shovels, it as soon as the degree of filling reaches an optimal value, also an optimal value at which the extension of the lever 54 on which the Follower roller 53 is seated, the microcontact 57 triggers. When the filling level of the buckets or scraper shovels is optimal Exceeds the value, so the microcontact 57 is triggered by the extension of the lever 54, and then the active one switches Control part of this microcontact by sending the electrical signal via cables to the control box of the drive device 17 already mentioned, to the pivoting movement of the bucket chain excavator to stop. If, on the other hand, the degree of filling falls far enough below the above-mentioned optimum value, the extension is removed of the lever 54 from the microcontact 57, which releases the switch box, so that the drive device 17 is approached again, which then causes the bucket chain excavator to pivot again. If the drive device 17 is rotary or linear Hydraulic motor acts - and the same would apply to pneumatic motors - is of course the microcontact 57 through a distributor replaced, the slide of which forms the movable scanning part that cooperates with the lever 54. In this case it is the active one Control part of the distributor via hydraulic or pneumatic lines connected to the engine. Analogously, the drive device can also be a mechanical one, and in this case will the microcontact 57 is replaced by a pedal, the moving part of which is directly connected to the lever 54 and via a mechanical power transmission cooperates with the mentioned drive device. In the example shown in Fig. 5 is a to achieve finer control of the operation of the bucket chain excavator.

In this example, which is a variant of the first embodiment, the detector device consists of two scanning rollers 53.1 and 53.2,

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those at different heights against strand A of the chains 25, 26 to press. These scanning rollers work with the microcontacts using the same means as described in the previous example 57.1 and 57.2 together. These microcontacts 57.1 and 57.2 are set to two different trigger values, which are also correspond to different degrees of filling of the buckets or scraper shovels. Furthermore, the drive device 17, the pivoting of the bucket chain excavator causes two speeds. If the filling level reaches a critical intermediate value, the follower roller 53.1 releases over the Lever 54.1 from the microcontact 57.1, which then controls the drive device 17 switches to low speed. When this degree of filling then reaches a critical maximum value, the follower roller releases 53.2 via the lever 54.2 the microcontact 57.2, which then the drive device 17 switches off and thus stops the bucket chain excavator whose buckets or scraper blades continue to rotate. The filling level increases If this bucket or scraper shovel is removed, the microcontact 57.2 is first released, which causes the drive device to low Speed shifts so that the bucket ladder excavator swings very slowly. If the degree of filling decreases further, the microcontact 57.1 released, which causes the drive device to switch to the so-called fast speed, so that the bucket ladder excavator then pans a little less slowly.

According to the second embodiment shown in FIGS the detector device speaks to changes in the position of the buckets 27, more precisely to changes in their pivoting position their degree of filling.

Because the fuller the buckets are, the stronger they become to the vertical swivel towards Since they hit the inclined ramp 29 with their front edge, the pivot point of the buckets on the chains is all the more off remove the ramp 29 (Fig. 8), the higher the degree of filling, so that the movement of the buckets causes the chains to flex. In order to detect the swivel position of the buckets, it is sufficient to determine the deflection 52 of the strand A of the chain or chains, and for this one only needs to use the same means as for the execution in FIG. 3 and its variant in FIG. 4 is described. These agents can also act directly on the bucket chain, but below

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the requirement that the microcontact itself or through its connections has sufficient release inertia to avoid the influence of the periodic actuation by the successively passing Steam Bucket.

The invention is not limited to the embodiments shown and described in detail, because there are different variants possible without going beyond the scope of the invention.

Claims (3)

PATENT Attorney Ί? A fi Ί Ί. EWALD OPPIRMANN D-6050 OFFENBACH (MAIN) ■ AM WIESENGRUND 35 · TELEPHONE C0611) 864006 · EWOPAT CABLE Lucien Rene Vidal December 14, 1982 51/27 CLAIMS 1. Device for regulating the degree of filling of the extraction elements of a Bucket chain excavator for granular or powdery substances (such as basic aggregates for the production of concrete), this Bucket chain excavator in particular consists of a frame (14) which - preferably by pivoting (16) - with respect to a supporting structure (1) can be moved sideways. This frame is connected to a drive device (17) for lateral movement, whereby at least one heap (11, 12) of the stored goods can be approached. About three nuts (22 to 24) (washers or pinions) attached to the Points of an obtuse triangle are arranged, at least one endless chain (25, 26) is removed on the frame, which, driven by a drive device (42 to 45), revolves and attached to the bucket (27) or scraper blades (28) are with their leading edge on the horizontal leg of the obtuse angle along the bottom and on the other leg of the at an obtuse angle along the slope of the dump or along an inclined ramp (29), indicated by - A detector device (53 to 55), the changes in the deflection of the ascending front run (A) of the chain or chains (25, 26) depending on the filling level of the bucket or scraper blades or on changes in the pivot position of the Bucket responds when driving up along the same embankment due to its filling level, and - An actuating device (57) which, via a trigger, which defines a reference value with which the change is compared on the one hand with the upstream detector device and on the other hand with the downstream drive device (17) cooperates, which makes it possible to move the bucket chain excavator sideways. 2. Control device according to claim 1, characterized in that the Detector device has a rotating element (53) such as a pinion, roller or the like, which against the already - 2 - . 3- called ascending front strand (A) of the chain or chains (25, 26) or on the conveyor line of the bucket between the upper (23) and the lower nut (22) of this strand and arranged is movably mounted on a holder (54) which, in order to ensure its mobility with respect to the frame (14), is guided (55) is and is preferably designed as a rocker arm. 3. Control device according to claim 1, characterized in that the actuation device consists of a trigger such as a microcontact (57), a distributor, a pedal or other, whose movable scanning part with the detector device, independently of the same type, and its active control part interacts with the drive device (17) via transmission parts such as electrical cables, lines, mechanical linkages or other are connected, depending on whether this drive device is electrically, works hydraulically or pneumatically, mechanically or in any other way.