DD289917A5 - METHOD AND DEVICE FOR TROUBLESHOOTING CONTROL OF BALING PRESSES WITH TWO-TABLE BINDING - Google Patents

Abstract

Method and device for deformity control on balers with two-thread binding refer to agricultural machinery. The thread length of the upper thread of each available binding apparatus, which is trailed only after a trouble-free sequence of the preceding binding process, is detected individually. In each case, a detection signal is formed and accumulated in memories. Upon reaching a predetermined setpoint value of the thread length, a signal is forwarded to a common, also the number of Verdichtungshuebe detecting comparison element. Only then is a signal passed on to a signaling device when at least one detection signal of the thread length has not reached the preset value. {Baler; Two string ties; Binding system; Method; Device; Lack binding control; Thread brake; Upper thread; Sensor; Storage; Limit signal formation; Signaling device}

Description

For this 2 pages drawings

Field of application of the invention

The method and the device for detecting faulty bindings is used on balers, preferably on large mobile balers for crops, whose binding device works with upper and lower thread (two-thread binding principle).

Characteristic of the known state of the art

In a known solution of a tractor-related large baler with six-fold binding the position of the upper thread tensioner is made visible by means of signal discs. During trouble-free operation, all six upper thread tensioners and thus also the signal disks move synchronously. In a disruption of the binding process, the corresponding signal disc no longer follows the uniform motion of the other five.

The disadvantage is that the tractor driver must constantly follow the movements of the signal discs. This must be seen regularly in the rearview mirror. This additional load can lead to quality defects and impaired productivity in Preßballenhersteliang.

Another solution is described in U.S. Patent Nos. 4,753,464 and 4,753,463. They include a device by which it can be detected by mechanical means whether the yarn paths are properly around the finished bale.

Accordingly, electrical signals are supplied, which are microcomputer-aided evaluated by a second device and trigger a faulty optical and audible warning of the tractor.

Compared to the former solution has the decisive advantage that the tractor is no longer distracted by additional observation of the signaling device.

However, the device for detecting the closed thread loops is an additional mechanical construction, each consisting of a stylus, the associated mechanism for moving the styli and a respective switching device. This device increases the mechanical complexity of the binding device and is itself sine another sources of interference.

However, it is necessary because in mobile square bales of binding security is of great importance.

Faulty bindings caused by technical problems with the binding system or the lack of binding agents must be recognized immediately, otherwise the efficiency of the presses can not be utilized.

Object of the invention

The object of the invention is to provide a method and a device for controlling the binding process for balers working according to the two-thread principle, which relieves the tractor operator in its control activity.

Explanation of the essence of the invention

The invention is based on the object to develop a method for mismatch control of balers with bifurcation that when dispensing with additional mechanical work elements a reliable control of the binding process takes place and only when Fehlbrndung the bale a signal to the tractor is given and to create a device which is less prone to failure under the conditions of the agricultural conditions and requires no additional expenditure of mechanically moving parts.

The object is procedurally taking advantage of the fact that in the Zweifadenbindeprinzip at any possible binding disorder in the consequence of the tightening of the upper thread from the thread reservoir fails, thereby achieved that the movement of the existing upper thread brakes is detected individually and in each case a b'rfassungssignal is formed. When a predetermined nominal value of the upper thread length is reached, a signal is forwarded to a common comparison element which also detects the number of compression strokes of the presso. If, after a certain, preselectable number of Preßhüben after each binding process not a true, vorwählbaro length of thread was pulled out of the upper thread reservoir of each binding device, there is a disturbance of the previous binding process. After reaching the preset value of the compression strokes, a signal is only formed and forwarded to an optical and / or acoustic warning device if one or more detection signals of the thread length have not reached the predetermined desired value After each binding operation, the stores for the thread lengths and the press-stroke counter are reset so that the checking process starts again The device according to the invention has mechanical elements which are moved by the tightening of the upper threads Preferably, the elements are the existing in the known Zweifadenbindevorrichtungen upper thread brakes, consisting of two gears which are engaged and between which the upper thread is pulled through, and their teeth by ge suitable sensors, preferably non-contact switches, are scanned. All sensors are each connected to a memory, preferably counters, which on reaching a preselectable memory contents an output signal n runs. The memory is provided with a common comparator, preferably AND or OR circuit, which directly, or via a gate with a Counter with limit value formation for the press strokes verbundei. is. Furthermore, a connection from the comparison element or the gate circuit preferably via a negator to the acoustic and / or optical signal device. A switch actuated by the binding device is coupled to the thread length memories and the compression stroke counter.

The operation of the device according to the invention is the following:

At each binding operation, first, by the action of a switch actuated by the needle shaft, the stores for the drawn thread length are cleared, and the counter for the compression strokes is set to zero. During the subsequent press strokes for the formation of the next bale, the upper thread tensioners are brought into the track position. Only then does the re-tightening of the Oborfadons from the reservoir, whereby the thread brake gets into Bewepung. If at each binding apparatus a certain length of thread has passed the brake, the associated memories provide a signal to the comparator, which in this case forms an output signal. The inverter causes no signal to be forwarded to the warning device when the gate is opened by the counter of the compression strokes if one or more stores for the thread length do not form an output signal. In the event that the corresponding threads were not tightened, no signal is produced at the output of the comparator. As a result, the negator forms a signal that passes the gate circuit after the predetermined number of compression strokes and activates the signaling device.

embodiment The invention will be explained in more detail using an exemplary embodiment. In the accompanying drawings show Fig. 1: Upper thread brake with sensor Fig. 2: Functional diagram of the device according to the invention

The upper thread brakes 12, which are required for the function of Zweifadenbindesystems a square block baler, are shown in FIG. 1 with sensors 1, z. B. inductive proximity initiators, so provided that they are confirmed by the teeth of the yarn brake 12. The number of output pulses of the sensors 1 is in direct proportion to the drawn upper thread length. Each sensor 1 is assigned a counter 2, which supplies an output signal from a specific counter reading, which is supplied to the common comparison element, in the example an AND circuit 3. The output of the comparator 3 is connected via a negator 7 to a gate circuit 4 which is connected to the counter of the compression strokes 5, which also provides a signal from a certain count and thus the gate 4 for passing the negated output signal of the AND circuit. 3 opens.

The input pulses for the counter 5 are from a switch 6, ι. B. inductive proximity, delivered, which is actuated once by the crankshaft of the press at each compression stroke. The output of the gate 4 is connected to the optical signal device 8 and a counter 9 with the acoustic signaling device 10. For reasons of ergonomics, the counting member 9 limits the acoustic signal, which must be very intense, so that the tractor noises are reliably ignored.

For the purpose of resetting the counters 2 and 5 they are connected to a switch 11, in the example also an inductive proximity initiator, which is confirmed by the needle shaft and thus deletes the counts of the counters 2 and 5 in each binding process.

The execution is preferably fully electronic. The I. Λ the advantage that no moving elements (such. As relays, mech. Counter) are present, their use is always problematic on mobile agricultural machinery.

Further advantages are the low space and energy requirements. Due to the variety of variants in the use of electronic Logigschaltungen it is possible to implement other circuit arrangements that meet the method claim. As an example may be mentioned that the counters 2 are connected so that the output signal is already negated. The Vergleichgllod 3 is then elno OR circuit, and the negator 7 can be omitted. Furthermore, there is the possibility of additionally connecting the outputs of the counters 2 to an optical signal device, so that in the case of a faulty binding it is also indicated which binding device is disturbed.

Claims (4)

1. A method for mismatch control on balers with two-thread binding, characterized gekonnzeichnet that the thread length of only after a trouble-free expiration of the previous binding process trailed upper thread (13) of each existing binding apparatus is detected individually, each formed a detection signal and accumulated in memories (2), When a predetermined nominal value of the thread length has been reached, a signal is forwarded to a common comparison element (3) which also detects the number of compression strokes, so that, after reaching a predetermined nominal value of the compression strokes, a signal is formed and sent to an optical and / or acoustic warning device ( 8 and / or 10) is forwarded if one or more detection signals of the thread length has not reached the predetermined desired value. 2. Apparatus for mismatch control on balers with two-thread binding, characterized in that existing mechanical and of the trailing upper threads (13) movable elements one ^; ndeapparates, are provided with sensors 1, which are connected to cumulative memories and Grenzwertsignalbildung (2), which is followed by a common comparison element (3), which is optionally connected via a negator (7) to a gate circuit (4) with a counter for compression strokes and limiting signal formation (5) is in communication, wherein the output of the gate circuit {· ') to an optical and / or acoustic signaling device (8) and / or (10) is connected. 3. A device according to claim 2, characterized in that the memory (2) and the counter for the compression strokes (5) are connected to a operated at each binding process and thus the memory contents deleting switching device (11). 4. Apparatus according to claim 2, characterized in that special of trailing upper thread (13) movable elements are provided, which are connected to a cumulative memory with Grenzwertsignalbildung (2).