DE2834931A1 - Self-loading trailer pick=up - has chopping knives swung into working position in elevator shaft by hydraulic ram - Google Patents

Abstract

The mechanism moves the knives of a chopping mechanism into the working position in a self-loading trailer. The knives hinge alongside each other on a spindle in the elevator shaft, and being held in the working position by locking devices with overload protection. The knives are swung into position by a hydraulic ram, typically that of the pick-up mechanism, the latter having a linkage with lugs engaging the knives comprising a sideplate. The swing arm is coupled by a pin working in an elongated hole to a lever turning the shaft on which the lugs are mounted.

Description

The invention relates to a device for engaging the knives of a cutting unit on a loading wagon with a receiving device, with knives lying next to one another, pivotable about an axis in a conveyor shaft, which are held in the working position by locks with overload protection devices.

From DE-OS 1 916 046 a cutting unit has become known which consists of a plurality of knives lying next to one another, which can be pivoted about an axis in a conveying shaft. They are individually held in the working position by locking devices with overload protection devices. Stones or other foreign objects that hit a knife trigger the overload protection device and the knife is swiveled out. It must be re-indented by hand. However, this is only possible if the conveyor shaft has been emptied beforehand, since the resistance of the material to be shredded is so great that it cannot be overcome by hand. It has also already been proposed to swivel the knives back into the working position by spring pressure after evasive action due to an overload. In order to ensure that the knives can evade when overloaded by falling rocks or the like, the spring must not, however, be made so strong that it can also pivot the knife in question back into the filled conveyor shaft.

Both in the case of knives to be re-engaged by hand and those which are acted upon by spring force, the loading wagon must therefore be stopped and the conveyor shaft emptied in order to bring the knives back into working position if one or more knives have been triggered. However, the resulting longer work interruptions are not economically justifiable.

The invention is based on the object of creating a device with which the knives can be brought into or back into the position of use even when the conveyor shaft is full.

According to the invention, this object is achieved in that a hydraulic piston-cylinder unit is used to engage the knives in the conveying shaft. In this way, the high pressure can be applied in a simple manner, which is required to engage the knives when the conveyor shaft is filled.

In an embodiment of the invention, it is proposed that the piston-cylinder unit with which the recording device of the loading trolley is operated hydraulically, also to use for engaging the knife. By eliminating an additional piston-cylinder unit, significant savings are achieved.

A linkage with drivers for engaging the knives is advantageously articulated on the receiving device.

In a preferred embodiment, the linkage is hinged to at least one side cheek of the receiving device provided with a swivel arm via a bolt / slot connection and engages a lever arm which is rotatably mounted about an axis with which drivers for the knives are firmly connected.

When the pick-up device is swiveled up hydraulically, the knives are brought into working position. The bolt / slot connection has the effect that, within certain limits, the recording device can be adapted to different ground conditions without the drivers also being actuated via the linkage. Since, depending on the degree of comminution desired, all or only a certain number of knives are to be pivoted into the conveying shaft, the drivers are designed according to the invention so that they can optionally be brought into the pivoting range behind the knives to be engaged.

In a structurally particularly simple and trouble-free design, forks are provided at each of the free ends of the drivers, in which forks provided with locking devices can be displaced transversely to the drivers and the knives. The bolts can be moved and locked in such a way that they protrude into the swivel area behind the knife to be engaged or not. So it can beforehand, depending on the number of knives that are to be swiveled into the conveyor shaft, to the corresponding drivers, the bolts are locked into the position in which they protrude into the swivel area behind the knives. When the hydraulic piston-cylinder unit is actuated, the drivers then bring the desired number of knives into the working position via the extended bolts. When the hydraulic piston-cylinder unit of the recording device is used to actuate the driver, the work flow does not normally need to be interrupted when a knife is swiveled out due to overload. The lifting of the recording device, which is usually required at the end of the field, also actuates the drivers via the articulated linkage, so that any knives that have been disengaged can be brought back into the position of use.

Since several knives lying next to one another are seldom disengaged at the same time due to overload, the short-term deterioration in the degree of comminution is slight.

Further details, advantages and features of the invention emerge from the following description and the drawing, to which express reference is made with regard to all details not described in the text.

It shows

1 shows a schematic side view of the engagement device according to the invention;

FIG. 2 shows a schematic cross section according to A A in FIG. 1.

Above and behind a square profile 1 to which knives 2 are movably articulated, a transverse shaft 3 is rotatably arranged in the side walls of the conveying shaft 4a. A lever arm 5 is attached to the left end of the transverse shaft 3 in relation to the direction of travel. On the lever arm 5, one end is one

Linkage 6 articulated. The other end of the rod 6 is articulated to one of the side cheeks 8 of a receiving device 9 via an elongated hole connection 7. The lateral cheeks 8 are mounted such that they can pivot about a pivot axis 10, so that the receiving device 9 can be lifted out with the aid of a hydraulic piston-cylinder unit 11.

The elongated hole connection 7 of the rod 6 is formed from an elongated hole 12 through which a bolt 13 passes. The bolt 13 is an integral part of a swivel arm 14 of the lateral cheek 8 of the receiving device 9, which is on the left in the direction of travel.

The length of the elongated hole 12 is dimensioned such that the receiving device 9 can adapt well to the ground surface during operation without the linkage 6 being adjusted. When the hydraulic piston-cylinder unit 11 is actuated, the receiving device 9 is rotated clockwise about the pivot axis 10, that is to say is lifted out. The pivot arm 14 consequently pulls the linkage 6 downwards, so that the transverse shaft 3 is rotated counterclockwise via the lever arm 5.

A number of drivers 15 are connected to the transverse shaft 3 in a rotationally fixed manner. The arrangement of each driver 15 is made in such a way that it - seen in a rear view - runs parallel to the knife 2 assigned to it, but is slightly offset laterally in relation to this. The top end of the driver 15 forms a U-shaped receptacle for a spring-loaded bolt 16. Via an adjusting toggle 17, the bolt 16 can be axially displaced against the spring action and at the same time rotated. In this way, the bolt can be brought into a disengaged position, which is shown graphically in FIG. 2 on the driver 15 on the right. In this position, the adjusting toggle 17 engages in a rearwardly open, U-shaped pocket.

The bolts 16 of each driver 15 can occupy two positions due to the arrangement described above: In a first position they cut the plane of the associated knife 2, while in the second position they completely change the position of the associated knife 2 when the transverse shaft 3 rotates leave unaffected.

the mode of operation of the subject matter of the invention is as follows:

If the crop is to be cut very short, for example for silage purposes, all knives 2 (approx. 10 knives and more) are swiveled into their working position shown in FIG. 1 in the conveying shaft 4a. If one of the knives 2 comes into contact with a foreign body, it automatically swivels out of the conveying shaft 4a after a response wave has been exceeded. The arrangement according to the invention was created so that the operator does not have to bring this knife 2 back into its working position by hand with considerable effort, which would also only be possible after the loading space has been completely emptied. By lifting out the receiving device 9, the knives 2 can be returned to their operating position after actuation of the hydraulic piston-cylinder unit 11. However, this only happens when the bolts 16 of the drivers 15 intersect the knife planes.

If only coarse shredding of the crop is desired, only individual knives 2, e.g. only every second knife 2, are swiveled into the conveying shaft 4a. The knives 2 not involved in the cutting process remain in their non-use position outside the conveying shaft 4a. So that when the lifting of the receiving device 9 caused pivoting of all drivers 15, only those knives 2 that are to be involved in the cutting process are swiveled in again, the bolts 16 of the drivers 15, which are assigned to the knives 2 that are not to be used, are in their non-engagement position (see FIG. 2 driver 15 on the right) brought.

For the transmission of force from the receiving device 9 to the lever arm 5, instead of a rigid linkage 6, a cable pull can also be used. The articulation to the bolt 13 can take place via a round eyelet to reduce wear. The unevenness of the floor is compensated for by a slight sagging of the cable.

drawing

List of reference symbols

1 square profile

2 knives

3 cross shaft

4a conveyor shaft

5 lever arm

6 rods

7 slot connection

8 cheek

9 Pick-up device

10 swivel axis

11 piston-cylinder unit

12 elongated hole

13 bolts

14 swivel arm

15 carriers

16 bolts

17 control knobs

Claims (6)

1. A device for engaging the knife of a cutting unit on a loading wagon with recording device, with side by side, pivotable about an axis in a conveyor shaft knives, which are held in the working position by locks with overload protection, characterized in that for engaging the knife (2) in the Conveying shaft (4a) a hydraulic piston-cylinder unit (11) is provided. 2. Apparatus according to claim 1, characterized in that the hydraulic piston-cylinder unit (11) is formed by the hydraulic piston-cylinder unit of the receiving device (9). 3. Apparatus according to claim 2, characterized in that a linkage (6) with drivers (15) for engaging the knife (2) is articulated on the receiving device (9). 4. Apparatus according to claim 2 and 3, characterized in that the linkage (6) is articulated on at least one with a pivot arm (14) provided side cheek (8) of the recording device (9) via a bolt / slot connection (13/7) and engages on a lever arm (5) which is rotatably mounted about an axis (3) to which drivers (15) for the knives (2) are firmly connected. 5. Apparatus according to claim 1, 2, 3 and / or 4, characterized in that the driver (15) can optionally be brought into the pivoting range behind the knife (2) to be engaged. 6. Apparatus according to claim 1, 2, 3, 4 and / or 5, characterized in that in each case at the free ends of the driver (15) in forks (15a) with locking devices (17) provided bolts (16) transversely to the drivers (15) and the knives (2) are displaceable.