FR2650723A1 - METHOD FOR CONTROLLING THE SHARP OF STRAWBERRY-STRAW KNIVES - Google Patents

Abstract

Method characterized in that: the proportion of the surfaces of the chopper knives to the total rotating surface lying in the cutting plane is determined without contact for sharp chopper knives and is stored; the quota thus memorized, measured for sharp chopper knives, is compared with the quota determined during operation; when crossing down a fixed limit value for the reduction of this quota, a signal is sent to the operator, a stop device is actuated, or else a sharpening device is put into service. Methods of controlling the sharpness of chopper knives are disclosed.

Description

"Process for controlling the cutting edge of chopping knives."

  The invention relates to a method for controlling the cutting edge of straw-chopping knives, in particular for chopper-pickers, while these knives are mounted on the machine. In addition, the method can be implemented for all knives which are fixed on rotational basic structures

  and which are set with respect to the cutting plane.

  The sharpness of the sharp edges of the chopping knives

  straw is decisive for the quality of the chopped product and determining for the quality of the chopped product

  and for the energy consumption of the straw chopper.

  This consideration is particularly important for high power self-driving choppers. But specifically, in the case of forage harvesters, the control of the sharp edges of the chopping knives is made very difficult because of the characteristics of construction, so much so that until now only a subjective evaluation by visual control in association with the experience of the operator. The control of the chopping knives is consequently always linked to a decommissioning of the machine and causes periods of stopping. Due to the poor accessibility to the straw-chopping knives, there is at the same time

risks of major accidents.

  Due to the different cutting characteristics of the harvesting products, the research undertaken to evaluate the sharpness of the straw-chopping knives via the power

  straw hatch did not succeed.

Purpose of the invention -

  The object of the invention is to create a method for controlling the cutting edges of straw-chopping knives, whereby the cutting edge of the chopping knives at a given time can be determined objectively without loss of time, while excluding

  accident risks for operators.

  Presentation of the nature of the invention -

  The problem posed to the invention is to create a method for controlling the cutting edges of the straw-chopping knives, in particular for chopper-type pickers, when these knives are mounted on the machine, and are adjusted with respect to the cutting plane on a cutting structure. rotatably mounted base, process whereby knife edges can be accurately evaluated during operation of the chopper without intervention

physical of the operator.

  This problem is solved, according to the invention, in that: a) While the chop-straw device is rotating, the share of the surfaces of the chopper-cutters lying in the cutting plane to the total surface rotating in the cutting plane, is determined without contact for sharp chopping knives and stored, b) this share is again determined continuously or at intervals during the operation of the chopper-straw device (c) the share thus stored, measured for sharp choppers, is compared with the participation determined during operation, (d) when crossing downwards a fixed limit value for the decrease in that quota -part, a signal is sent to the operator, a stop device is actuated, or a device

grinding is put into operation.

  According to another characteristic of the invention, the share of the surfaces of the straw-chopping knives to a total measurement time is

determined.

  To determine the cutting edges of the straw-chopping knives, the geometric modification of the straw-and-straw knives placed obliquely with respect to the cutting edge is used. When wear occurs on the cutting edge of the chopping knife, the length of the chopping knife surface in the cutting plane decreases. This can be measured by detecting the participation in length

  or in time of this surface of chopping knives

  straw in relation to the total length or the total measuring time. The measured values are applied to an electronic unit with a memory capacity for further processing. For the measurement, it is advantageous to use electrical emitters operating without contact, insensitive to pollution, in particular fast emitters operating according to the

inductive or magnetic principle.

  The limit value is then determined in advance by tests on the state of wear of the cutting edge, from which the quality of the chopped product is unacceptably poor, while the energy consumption of the chaff-straw strongly increase. This limit value is provided as

  constant to the electronic unit.

  Thanks to the solution according to the invention, on the one hand the availability of the straw chopper is increased, and on the other hand, the energy consumption of the chopper is lowered, thanks to the improvement of the chopping capacity. cutting as a result of the timely regrinding of the chopping knives, in combination with appropriate adjustment of the cutting interval with respect to the fixed counter knife. Thanks to the information provided to the operator by display means at the service station, the invention ultimately results in a reduction of the risk of accidents. The invention will be explained in more detail

  hereinafter with reference to an exemplary embodiment.

  At a short distance above the rotating envelope of a straw-chopper drum, a fast inductive emitter is arranged. For sharp chopping knives, for example immediately after grinding, the length share is determined in the form of a quota in time of the passage of the chopping knife under the transmitter, at the time of sharpening. total measurement, and is memorized

in an electronic unit.

  The transmitter then controls a gate circuit that applies to a counter the pulses of a frequency generator. The cutting edge of the chopping knife delivers the starting signal and the rear edge of the surface of the chopping knife lying in the cutting plane delivers the stop signal for counting the pulses. A second counter records the pulses of the total measurement time, and after the measurement, the results of the counters are divided, exploited with respect to the

  exceeding the limit value, and stored.

  This measurement is repeated at intervals of time during the operation of the chopper, and symbolically indicated to the operator as the current state of the cutting edge, If the comparison ratio, because of the quota going to s 'lessening straw-chopping knives, decreasing to a previously fixed and programmed limit value, an acoustic and optical symbolic signal is generated which requires the operator to stop the process of

  operation and to sharpen the chopping knives

  Straw. In combination with known solutions for automatic sharpening and adjustment of the opposing knives, the entire process for creating optimal cutting conditions is likely to be automated in that the signal thus triggered is used itself or by involving the operator to stop the straw chopper with a waiting time allowing the preparation of the harvesting product already collected, the commissioning of the sharpening device and the setting following the knives

antagonists.

Claims (3)

  1.- A method for controlling the cutting edge of straw-chopping knives, in particular for chopper scrapers, while they are mounted on the machine, and that these knives are adjusted relative to the cutting plane on a base structure mounted so rotatable, characterized in that: a) while the straw-chopper is rotating, the proportion of the chopping-knife-edge surfaces lying in the cutting plane to the total rotating surface being in the cutting plane is determined without contact for sharp chopping knives and is stored, b) this quota is again determined continuously or at intervals during the operation of the chopper device, c) the quotation -part thus stored, measured for sharp chopping knives, is compared with the share determined during operation, d) when crossing down a fixed limit value of the diminuti this share, a signal is sent to the operator, a stop device is actuated, or a device grinding is put into operation.   2. A process according to claim 1, characterized in that the quota of the surfaces of the straw-chopping knives to a total measurement time is determined. 3. A process according to claim 1, characterized in that for the measurement of the electrical emitters operating without contact, insensitive to pollution, including fast emitters operating according to the inductive principle and magnetic.