FR2621446A1 - BALL PRESS PRESS - Google Patents

Abstract

The baler comprises a set of front belts 13 guided on rollers 20, 21 and arranged in a front casing 1, and a set of rear belts 14 guided on rollers 27, 30 and arranged in a rear casing 3 capable of tilting in an unloading position 5. Two sections of belts 24, 26 moving in opposite directions, define a winding chamber 11 and are guided between two intermediate rollers 23, 28 arranged at a small distance from each other on a support part 37 at a certain distance above a feed slot 16, this support part being movably mounted on one of the housing parts so that the intermediate rollers 23, 28 move towards the side. up against the action of a tensioning device of belts 37 to 43 as the diameter of the bale increases. The sections of belts 19, 29 of the two sets of belts 13, 14 opposite to the winding chamber 11 are guided by rollers 20 to 22, 27, 30, 32, 33, to a mobile tensioning roller 31 placed at the interior of the space surrounded by a set of belts, the axes of rotation of these rollers being fixed on the housing parts 1, 3. Application in particular for the formation of round bales of straw or fodder.

Description

The invention relates to a baler for forming round bales

  of straw and fodder, which has a set of forward belts guided on rollers and disposed in a front housing, and a set of back belts guided on rollers and disposed in a rear housing capable of tipping into an unloading position, two stretches of moving belts

  in opposite directions delimiting a winding chamber

  ment and being guided between two intermediate rollers arranged at a small distance from each other on a support part at a distance above a feed slot, this support part being mounted movably on one of the parts of the housing so that the intermediate rollers move upwards against the action of a belt tensioning device

  when the diameter of the ball increases.

  A press-collector of this type is

  example known from EP-A-0 125 719. This press is

  the pick-up machine comprises a set of front belts and a set of rear belts, which are guided by rollers with fixed axes of rotation and partly by moving rollers, so that on the one hand two

  stretches of belts moving in opposite directions

  of the winding chamber and that, on the other hand, there is a reserve of

  sufficient length which is absorbed when the dia-

  the ball increases and the volume of the winding chamber increases accordingly in the

  sections of belts defining the winding chamber

  is lying. The sections of belts moving in opposite directions are guided for this purpose by two intermediate rollers which deviate approximately in a straight line upwards via a linkage

  with parallel articulated arms arranged on the front casing.

  In addition, three moving tension rollers are provided

  to absorb the necessary excess lengths of the belts.

  To obtain the necessary density of the bale after compression, the belts and the support parts of the mobile rollers must be kept under sufficient tension and move only under

  the effect of a predetermined tension during the increase

  the diameter of the bale, four hydraulic cylinder units

being provided for this purpose.

  In the case of known devices, the control means for the expansion of the winding chamber

  and adjusting the density of the ball are very expensive.

  In addition, these devices have the disadvantage that the belts are subjected to alternating flexing,

  which cause significant wear of the composite material

  straps and condition the presence of

  bindings made of "eagle greenhouses" that are sensitive to wear and are not very resistant to traction. In the case of the aforementioned European patent, the direction of flexion alternates

  for example twice during a lap belt.

  According to DE-PS 24 43 838, there is a very simple construction of a round baler, of the type known as the "principle of the fixed chamber", which avoids

  the aforementioned drawbacks, but which nevertheless runs up against

  time, with the currently known means, to limits in terms of a further increase in the density of the bale, desired when using the bales for commercial purposes, and under certain conditions of the harvested product, for example

  in the case of a very dry straw.

  The object of the invention is to improve a round baler of the type indicated at the beginning, so that the aforementioned drawbacks are avoided and the round baler uses the advantages

  of the principle of the fixed chamber.

  To solve this problem and according to the invention it is proposed that the belt sections of the two sets of belts opposite the winding chamber are guided by rollers, to a mobile tensioning roller arranged inside the space. surrounded by a set of belts, the rotation axes of these

  rollers being fixed on the housing parts.

  The configuration of the round baler according to the invention thus comprises only the pair of pressure rollers necessary for high compaction and formed by the intermediate rollers, and another tensioning roller which stores the necessary belt extension without alternating bending of the belt

  and who releases it when needed. The order is made

  kills in a simple way and by a single voltage device, which can also be used simultaneously

  in the case of a hydraulic cylinder unit for

  worm the rear cover. The product is initially loosely wrapped in the initial triangular winding space of constant volume, while the material is then wound tightly around said core when the winding chamber deforms, the core thus being able to be compacted from the outside to the inside. A round bale is obtained having a very small star-shaped bent core which is surrounded by layers of high compactness. The core area of this round bale can also be

easily disaggregated.

  In a preferred embodiment of the invention, the support portion and the tensioner roller are disposed on a common pivot axis. The

  complete control of the expansion of the hoisting chamber

  can be done from one point, for example

a means of tension.

  According to another characteristic of the invention, it is provided that the support portion is composed of two support arms located at a distance from one another and extending forwardly from the pivot axis these arms suppporting at their free end the two intermediate rollers by means of a pivoting support, whereas the tensioning roller is

  connected to the pair of support arms at a certain distance

  below the pivot axis by means of a pair of lever arms. By this arrangement, the two intermediate rollers always rest on the bale, so that, on the one hand, the belts driving the bale reliably support along their entire periphery on the bale and on the other hand , high local pressure can

  be exercised on the ball by the intermediate rollers

diaries.

  An embodiment particularly

  advantage is obtained if the tensioning roller is

  placed on the support part pivotally about an axis coaxial with the pivot axis, so that during the bale forming process, the tensioning roller takes a position defined by a stop, whereas during the raising of the With the rear casing in the unloading position, the tensioner rolls under the action of resilient means in the opposite direction to tension the released belt length of the rear set of belts. In this way the tensioner roller also reliably absorbs excess belt lengths when raising the rear cover and prevents the belts from "slamming" or "popping", so that belt drive is not interrupted during the process. unloading the ball. According to the invention, in the starting position, the intermediate rollers are approximately at the center of a ball of maximum diameter in the winding chamber. The larger starting volume of the winding chamber allows

  belts have a shorter reserve length

  dre. In addition, the uncompressed material which is initially fed into the initially free space can be distributed and then compressed from the outside to the inside, so that no hard core is obtained which

  only disintegrates with difficulty.

  Other features and benefits of

  the invention will appear in the description below.

  In the accompanying drawings, given solely by way of non-limiting examples:

  - Figure 1 is a longitudinal sectional view

  of a round baler according to the invention.

  before the formation of the ball; FIG. 2 is a view similar to FIG.

  Figure 1, representing the state reached during training

  a ball having the maximum diameter; FIG. 3 is a view similar to FIG. 1, the rear casing being raised in position

unloading.

  The round baler has a

  two-part press enclosure, consists of

  a front casing 1 which is fixed on a movable frame 2 and a rear casing 3 which is liftable in

  unloading position 5 about a pivot axis

4.

  The front casing 1 has two front side wall elements 6, which are connected to each other by transverse links. The rear case 3

  has two rear side wall elements 7.

  In the closed position, these have their front edge 8 against the front side wall elements 6. A traction element 9 engages the front casing 1, to make a connection with a tractor, not shown, which pulls the press round bales in the fields in

  the direction indicated by the arrow 10.

  In the press enclosure 1, 3, a

  winding chamber 11, the diameter of which can be

  dir when forming a ball, is delimited downwards by a bottom conveyor 12 and upwards by a set of front belts 13, as well as by a set of back belts 14. The bottom conveyor 12 and the Sets of belts 13, 14 consist of one or more endless belts arranged next to each other, which are driven in a common direction of rotation. These belts can however be made in the form of conveyor chains. At the lowest point of the front of the press enclosure is left

  free a feeding slot 16. A ramas drum-

  sage 17 is mounted at the front and below this slot.

  The set of front belts 13 extends in a parallelogram in a starting position 18 visible in Figure 1, that is to say before the start of the process of formation of the ball. A belt section 19 opposite the winding chamber 1 moves on

  front return rollers 20, 21, whose rotation axes

  are fixed in the front side wall elements 6, on an upper return roller 22, the axis of rotation is fixed in the wall elements

  rear side 7, as well as on an intermediate roller.

  23. A belt section 24 directly defining the winding chamber 11 moves in the direction of the arrow 25 and extends from the forward return roller 20 to the front intermediate roller 23.

  In his starting position 18 also

  In Fig. 1, the backstrap set 14 forms an isosceles triangle. A rear belt section 26 directly defining the winding chamber 11 moves in the opposite direction with respect to the front belt section 24 and extends between a lower return roller 27, the axis of rotation of which is fixed in the rear side wall members 7, and a rear intermediate roller 28. A belt section 29 opposite to the winding chamber 11 first moves upwardly from the rear intermediate roller 28 to an upper return roller 30 of which the axis of rotation is coaxial with the pivot axis 4 of the rear casing 3, and is fixed in the front side wall members 6. From the roller 30, the belt section 29 passes over a tensioning roller 31, which will be described in more detail below, and leads to the lower return roller 27, the axis of rotation is fixed in the rear side wall sections 7. In addition, two support rollers 32, 33 extend further. in the rear side wall sections 7, and prevent mutually contacting the belt section 26 enclosing the bale and the belt section 29

  opposite, as can be seen in Figure 2.

  The intermediate rollers 23, 28 are in the starting position 18 approximately mid-diameter of a ball 34 drawn in Figure 2 to the maximum diameter. They guide between them the two sections of belts 24, 26 moving in opposite directions. The two intermediate rollers 23, 28 are rotatably mounted in a support 35, which is pivotally mounted about an axis 36 located at the free end

  of a support part 37, in the manner of a hung head

  lar. The support portion 37 consists of two support arms 38 that extend from the rear to the front and

  which are each arranged directly on the

  of the two rear side wall elements 7.

  The support arms 38 are connected to each other, so as to rotate together, by a transverse tube 39 which is mounted in the rear side walls 7 so as to pivot about a pivot axis 40, and which extends at both ends outwards in

  crossing these sections. Arms 41 are fixed directly

  outside each sidewall section 7 respectively on each outer end of the tube

  39, and are each connected to a hydraulic cylinder

  42 mounted on a bolt 43 of the wall element

rear side 7 respective.

  Lever arms 44 are pivotally arranged on the transverse tube 39 respectively in close proximity to each rear inner side wall section 7, coaxially with respect to the pivot axis 40, and carry the tension roller 31 to

  a certain distance under the pivot axis 40.

  Each lever arm 44 has a stop 45 which presses on the support arm 38 during the process of forming the bale, as shown in FIG. 2, because of the tension of the belt, so that the part The support 37 and the lever arm 44 of the tension roller 31 move as if they were rigidly connected together. A pull spring 46 engages at one end on the lever arm 44 and at the other

  end on a plate 47 welded to the trans-

  The spring force is sized to be smaller than the tension force of the belts during the bale forming process. Due to the possible elasticities of the belts, the stop 45 may be slightly distant from the support arm 38 in the starting position 18. Before the start of the process of forming the ball all the elements take the starting position

18 of Figure 1.

  The round-baler balers shown are drawn in the fields by a tractor on a straw bucket which is picked up by the pickup drum 17 rotating in the direction of arrow 50, and which is fed through the feeding slot.

  16 in the winding chamber 11.

  The bottom conveyor 12 transports the javelle to the stretch of belts 26 which moves upwards; from this section the product is driven upwards for a certain distance and then is thrown forward by the section of belts 24

  which moves in the direction of the arrow 25, homogenizes

  Thus, in the direction of its width, it is produced because of the relatively large initial volume of the winding chamber 11, and begins to wind in a roll. Due to the feeding of the product, the round bale 34 increases in size until finally reaching its maximum diameter shown in FIG. 2. During the winding process, the intermediate rollers 23, 28 constantly press on the periphery of the ball, exert a downward pressure that can be predetermined by means of the hydraulic cylinders 42, and move upwards

  when the size of the ball grows.

  The axis 36 of the support 35 of the intermediate rolls

  23, 28 moves on this occasion on a path 48 bent backwards, and yields under the initial tension belt length absorbed by the belt section 24 during the process of formation of the ball. The tensioning roller 31 moves, along with the support portion 37, along the path 49 of the position 51 shown in FIG. 1 at the position indicated in FIG. 2. The stops 45 constantly press on the support portion 37 ,

  so that the tensioner roller 31 and the intermediate roller

  intermediate 28 remain at a constant distance from one another, and that the length of the belt required by the belt section 26 is reliably transferred.

  and regular under the initial tension when expanding

the diameter of the ball.

  The round bale 34 shown in FIG. 2 is tied several times by introducing a Miage string strand coming from a binding device not shown, and is then ejected by raising the rear case 3 in the unloading position 5 shown in FIG. Figure 3. Simultaneously with the raising of the rear housing 3, the deflection roller 22 pivots about the pivot axis 4 and thereby releases the length of belt yielded by the intermediate roller 23 during the recovery. In the unloading position 5 of the rear housing 3, the belt length of the belt section 26 which has been released by the ejected round bale is tensioned by the tension roller 31, which moves counter-clockwise during ejection under the action of the force of the tension spring 46, to go to its position in FIG.

  closing the rear case 3, all the elements return-

  are automatically in their starting position 18 of Figure 1, a new cycle of ball formation

can begin.

262 1 446

Claims (13)

  1. Baler-baler for forming round bales of straw and fodder, which has a set of front belts (13) guided on rollers (20, 21) and arranged in a front housing (1), and a set of belts rearward guide (14) guided on rollers (27, 30) and arranged in a rear casing (3) capable of swinging into an unloading position (5), two sections of belts (24, 26) moving in opposite directions delimiting room   winding (11) and being guided between two intermediate rollers   diaries (23, 28) arranged at a short distance one of   the other on a support part (37) at a certain distance   above a feed slot (16), said support portion being movably mounted on one of the housing parts such that the intermediate rollers (23, 28) move upwardly against the action of a belt tensioning device (37 to 43) when the diameter of the bale increases, characterized in that the belt sections (19, 29) of the two sets of belts (13, 14) opposite the chamber winding (11) are   guided by rollers (20 to 22, 27, 30, 32, 33),   than a mobile tensioning roller (31) placed inside the space surrounded by a set of belts, the axes of rotation of these rollers being fixed on the parts of casing (1, 3).   2. Press-collector according to claim 1, characterized in that the tensioning roller (31) is   pivotable with the support portion (37).   3. Baler-baler according to one of the   1 or 2, characterized in that the support part (37) and the tensioning roller (31) are arranged   on a common pivot axis (40).   4. baler according to claim 3, characterized in that the pivot axis (40) is mounted on the rear case (3).   5. Baler-baler according to one of the   1 to 4, characterized in that the tensioning roller (31) is mounted at the top of an isosceles triangle formed in a starting position (18) by the rear set of belts (14), and the base of which is the section   belt (26) delimiting the winding chamber (11).   6. Baler-baler according to one of the   1 to 5, characterized in that the support portion (37) consists of two support arms (38) located at a certain distance from each other and extending forwardly from the axis pivoting means (401), these support arms carrying at their free ends the two intermediate rollers (23, 28) by means of a pivoting support (35), whereas the tensioning roller (31) is connected to the pair of support arms ( 38) at a distance below the pivot axis (40) by means of a pair of levers arms (44).   7. Press-reamer according to one of the   1 to 6, characterized in that the tensioning roller (31) is pivotally arranged on the support part (37) about an axis coaxial with the pivot axis (40), so that during the process for forming the bale, the tensioning roller (31) takes a position defined by a stop (45) and moves in conjunction with the support part (37), whereas, when the rear casing (3) is raised to the unloading position (5), the tensioning roller (31) tilts under the action of resilient means (46) in the opposite direction to tension the belt length liberated from the set of rear belts (14).   8. A baler according to one of the   1 to 7, characterized in that the   intermediate (23) of the front belt set (13) moves along a backward curved path (48)   in the space surrounded by his belts.   9. Baler-baler according to one of the   1 to 8, characterized in that in the posi-   the intermediate rollers (23, 28) are approximately at the center of a bale (34) of maximum diameter winding chamber (11).   10. Press-collector according to claim 1   or one of claims 4 to 9, characterized in that   that each intermediate roller (23, 28) is pivotally mounted on a support part, the two support parts being connected to each other by a coupling bar, and a support part being connected to with the tensioning roller (31).   11. Baler-baler according to one of the   1 to 10, characterized in that the upper return roller (22) of the front belt set (13)   is carried by the rear casing (3).   12. Baler-baler according to one of the   1 to 11, characterized in that the set of belts (14) associated with the tensioning roller (31) has   belts of greater length.   13. Baler-baler according to one of the   1 to 12, characterized in that in the lower zone between the pick-up drum (17) and the lower return roller (27) of the rear casing (3), the winding chamber (11) is delimited by feeding drums, a set of belts (12)   or similar endless feed items.