FR2574620A1 - DELESTAGE DEVICE FOR CUTTING TABLES OF AGRICULTURAL HARVESTERS - Google Patents

Abstract

A. WEIGHTING DEVICE FOR CUTTING TABLES OF AGRICULTURAL HARVESTERS. B. CHARACTERIZED IN THAT A COUPLING ROD 10 IS PIVOTALLY FIXED TO THE BASE MACHINE 2 IN A BRACKET 9 AND AT THE OTHER END TO A SWIVEL LEVER 12, ONE OR MORE TENSION SPRINGS 18 AND A TENSION ROD CONNECTORS 13 ARE PLACED IN A SWIVELING WAY ON THE SWIVEL LEVER 12 AND THE CONNECTION ROD 13 MOVES APPROXIMATELY IN THE DIRECTION OF THE LENGTH OF THE PENSION SPRING OR THE PENSION SPRINGS 18. C. THE INVENTION CONCERNS AGRICULTURAL HARVESTERS.

Description

i Load shedding device for cutting tables of agricultural harvesters

  The invention relates to a load shedding device-

  for cutting tables of agricultural harvesters that

  can rotate in two planes around a semi-

  carried to the lower part of the base machine or conveyor of the basic machine to follow the soil profile. These cutting tables are used in particular

on combine harvesters.

  To achieve, with cutting tables of this type, mower bars in particular, to a cut as close as possible to the ground, they are guided on the ground by means of pads. The pads follow the profile of the ground. In particular, for cutting tables of large cutting width, it is necessary in this case, that the cutting tables can follow the profile of the ground, on the one hand, in the plane parallel to the direction of the walk

  and, on the other hand, transversely to the direc-

  the march. In this case, it is generally necessary to

  that the load with which the cutting table is on the ground is as low as possible to prevent settling of the ground, high wear of the pads and high resistance to walking. To achieve this low load on the ground, various solutions are used.

  for unloading cutting tables in the direction of the ground.

  A solution is known from patent DE-GM 66 05 471. In this case, the reduction of the bearing load on the ground is achieved by a system of tension springs disposed in an auxiliary frame between the base machine and the pivoting conveyor of the basic machine, to which is securely coupled the cutting table. This solution has great disadvantages. On the one hand, the spring system must be very powerful and, with that, must be of massive constitution, because it must support the conveyor in addition to the cutting table. On the other hand, it achieves an optimal bearing load on the ground only in a position of the cutting table. The bearing load on the ground changes continuously with the lifting or lowering of the cutting table following the ground. As a result, important wear phenomena of the pads, settling of the ground near the pads,

  and high resistance to walking.

  In DE 94 725, it is described that the

  cutting table is resting down on a semi-

  carried on the conveyor of the basic machine and that it

  is pointed upwards by an auxiliary frame

  lant and sliding. For the reduction of the bearing load on the ground, traction springs, which are articulated on the conveyor are attached to the auxiliary frame. In this solution, the mass of the cutting table needs only partly to be rectified but, as in DE GM 66 05 471, the bearing load on the ground of the cutting table varies, in this case also, according to the position of the latter during the oscillation in the plane parallel to the direction of the march. Thus, the disadvantages already mentioned remain. In both solutions, the causes lie in an insufficient possibility of compensation of the shedding force exerted with the load-bearing processes on the ground of the cutting tables or cutting tables and the conveyor which actually occur in the different positions of the cutting table when

follows the ground.

  Another disadvantage of the load shedding device according to the DD 94 725 patent lies in the fact that, when the cutting table is raised in a very high position, which is well above the working area and which is required, for example when moving or removing the cutting table on a transport trolley or removing additional assembly elements

  are essential for securing the cutting table to

voyeur.

  The object of the invention is to provide a device

  load-shedding device for cutting tables which ensures a low and constant load on the ground in the whole working area of the cutting table and, with it, low ground settling, low resistance to walking and low wear of the pads. The load shedding device must be of economical manufacture and must be universally usable for different cutting tables. In addition, the expenditure for the attachment of the cutting table to the conveyor, at its highest position,

must be diminished.

  The object of the invention is to provide a device

  load shedding system for cutting tables that can be pivoted

  in two planes around a semi-span point at the bottom of the base machine or on a conveyor of the base machine, in which the load shedding force exactly follows the evolution of the support load on the floor of the cutting table that actually occurs in the working area thereof and which sets the cutting table in the highest position to the conveyor without

  additional assembly elements. In addition, the

  The load shedding system must be of simple construction.

  This is achieved according to the invention in that a coupling rod is fixed in a support on the base machine or on the conveyor pivotally and at the other end is fixed by a pivot to a pivoting lever , one or more tension springs and a connecting rod are pivotally mounted on the pivoting lever, the tension spring or the tension springs are pivotally attached to the support and the connecting rod moves approximately in the direction of the length of the tension spring or the tension springs. The load-shedding device according to the invention is arranged on the basic machine, or on the conveyor

  of the basic machine, in a plane parallel to the direction

  the step at a distance from the semi-reach point and is hingedly attached to the cutting table by the connecting rod. When following the ground in the plane parallel to the direction of travel, the cutting table swings around the semi-bearing joint, which corresponds to the level of the

  connecting rod with an approximate back and forth movement

  in the sense of the length of the load-shedding device. In this, the number of tension springs and their tension are chosen so that the working point of the cutting table remains a minimum load on the ground of the cutting table. Thanks to the pivoting around the semi-span point, this load on the ground varies because the center of gravity of the cutting table is

  moves relative to the semi-span point. This evolution

  Bearing load on the ground gives a curve with regard to the pivoting stroke or starting stroke. But, at the same time, during the pivoting, by the connecting rod of the unloading device, the pivoting lever thereof moves, whereby the force of

  shedding of the tension spring or tractive springs

  is amended. Thanks to an appropriate articulation of the connecting rod and the tension spring or the tension springs to the pivoting lever, it is then possible to adapt the linear evolution of the load shedding force of the tension spring to the evolution of the load of support on the ground. During an oscillation of the

  cutting table transversely to the direction

  the load on the ground does not vary, because the unloading device, thanks to the single rear support on the base machine or on the base machine's conveyor, can follow this movement without that there is a displacement of the pivoting lever. he

  in this respect, it is sensible that the distance between

  coupling of the connecting rod on the cutting table and

  the support is equal to several times the deviation of os-

  possible oscillation transversely to the running direction of the cutting table at the joint

connecting rod.

  When the cutting table is raised to the position

  the center of gravity moves so far backwards beyond the semi-reach point that, from a certain lifting height above the working area, the load shedding force predominates. As a result, the cutting table is drawn against

  the basic machine or its conveyor. For a good function

  According to the invention, the load shedding springs are taken in a rocker and the rocker is hingedly attached to the pivoting lever. In order to adapt the shedding force of the different cutting tables, it is furthermore appropriate for the rocker or the tensioning spring to have a pivot pin which can slide in the radially pivoting lever approximately radially.

  relative to the pivot, for example by means of a threaded rod.

  A last advantageous configuration of the dis-

  positive load shedding according to the invention consists in the fact that, to adapt exactly the evolution of the linear load shedding force of the tension spring to the evolution of the non-linear bearing load on the ground, the pivot pin of the rocker or traction spring is located

  at a greater radial distance from the pivot than the articu-

  The connection rod and pivot pin, pivot and hinge of the connecting rod form the vertices of a triangle in the pivoting lever. With the invention, there is provided a load shedding device for oscillating cutting tables in two planes, whereby the load on the ground is constantly low throughout the working area. By this fact, the wear of the pads is

  reduced soil settlements are reduced and the resistance

  walking is lessened. This last advantage leads to fuel economy. By adjusting the tension spring or the tension springs in

  the pivoting lever, it is possible to use universal-

  the load shedding device for cutting tables

  different without the need for a transformation.

  Finally, to fix, when raised, the cutting table to the basic machine or to its conveyor,

  no additional assembly is needed.

Example of embodiment.

  The invention and illustrated hereinafter in more detail with the aid of an exemplary embodiment and the drawings which accompany it, among which: FIG. 1 represents a kinematic diagram

  a conveyor with a coupled mower bar and

shedding power; -

  FIG. 2 represents the device for

in the unloading position,

  FIG. 3 represents the device for

  in fully loaded position.

  On the conveyor 1 of a basic machine 2, no

  shown in more detail, for example from a harvester-

  thresher, is mounted a cutting table 3. The conveyor 1 is pivotally attached to the basic machine 2 in

  the supports 4. Two hydraulic cylinders 5, for the pivo-

  1 of the conveyor 1, are articulated between the latter and the basic machine 2. The cutting table 3, for example a mower bar with a cutting bar 6, is coupled at its lower rear middle part by a point

  of semi-span 7 that can pivot in two planes, with

  voyeur 1. In addition, the cutting table 3 has, in accordance

  a frame 8 disposed in a nearly vertical plane.

  At the end of the conveyor 1, on the side of the base machine, is located in the middle of its upper face, a support 9. In the support 9, is pivotally attached a coupling rod 10. At the At the front end, on the side of the cutting table, a pivoting lever 12 is hingedly connected to the coupling rod by a pivot 11. The pivoting lever 12 has a triangular configuration, the pivot 11 being placed at an angle. In the corner making

  facing the support 9 is articulated a connecting rod 13.

  In the remaining angle is placed, so as to be able to slide

  in a slot 14 extending substantially radially relative to the pivot 12, a pivot pin 15 through which passes a threaded rod 16 supported by the pivoting lever 12. This pivot pin 15 is in all cases to a greater distance from the pivot 11 than the articulation of the connecting rod 13. On this pivot pin 15 is articulated a rocker 17 in the head of which two traction springs 18 are hung by their opposite ends in a plate of support 19 on the support 9. The connecting rod 13 moves from the articulation of the pivoting lever 12 in extension of the connecting pin to the support 9 towards the front, to the frame 8 of the cutting table 3 o it s interlocking

to a fixing pin 20.

  It must be understood that the description

  above has been given for illustrative and non-limiting purposes only and any variations or modifications may be made without departing from the general framework

  of the present invention as defined above.

R E V E N D ICAT I 0 N S

  1) Load shedding device for cutting tables of agricultural harvesters which can pivot in two planes around a lower semi-feed point on the base machine or on a conveyor of the basic machine, characterized in that a coupling rod (10) is pivotally attached to the base machine (2) or conveyor (1) in a carrier (9) and is attached at the other end to a pivoting lever (12) by a pivot ( 11), one or more tension springs (18) and a connecting rod (13) are pivotally placed on the pivoting lever (12), the tension spring or the tension springs (18) are attached to the way

  swivel and connecting rod (13) moves approximately

  in the sense of the length of the spring of

  traction or traction springs (18).

  2) Load shedding device according to the claim

  1, characterized in that the traction springs (18) are taken in a rocker (17) and the rocker (17).

  is hingedly attached to the pivoting lever (12).

  3) Load shedding device according to the claim

  1 or 2, characterized in that the rocker (17) or the tension spring (18) has a pivot pin (15) which can slide in the pivoting lever (12) in such a way that

  approximately radial with respect to the pivot (11).

  4) Discharging device according to the claim

  1, characterized in that the pivot pin (15) of the rocker (17) or of the tension spring (18) is at a greater radial distance from the pivot (11) than the articulation of the connecting rod. (13) and that pivot pin (15), pivot (11) and articulation of the connecting rod (13) form in the pivoting lever (12) the

vertices of a triangle.