• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A baler (10) contains a bale chamber (26) for compressing crop material into bales (42), with a floor (42), a ceiling (44), and two walls (46, 48). A plunger (30) forces harvest material into the bale chamber (26). An actuator system (50) presses the ceiling (44) and the walls (46, 48) of the bale chamber (26) inwards. At least one retractable friction block mounted in the ceiling and / or in one or both walls (46, 48) is used to increase the compression and density of the crop. The friction block (72) extends inward to increase the decreased pressure exerted against the ceiling (44) or the walls (46, 48) by the crop during its bay formation, or during the inward movement of the ceiling (44) ) or the walls (46, 48) through the actuator system (50).
    公开号:BE1022884B1
    申请号:E2015/0184
    申请日:2015-07-03
    公开日:2016-10-05
    发明作者:Sven Monbaliu
    申请人:Cnh Industrial Belgium Nv；
    IPC主号:
    专利说明:

    RETRACTABLE BLOCKS IN THE DOORS OF A LARGE VTERK ANTEB ALENP ERS
    BACKGROUND OF THE INVENTION
    This invention relates to balers for use in agriculture (hereinafter referred to simply as balers) and more particularly to a baler with retractable friction blocks in the ceiling and in the walls of the bale chamber.
    Balers are used in agriculture to assemble and package harvest material to facilitate storage and handling of the harvest material for later use. In the case of hay, a mower-conditioner is usually used to cut the harvest material and prepare it to dry in windrows. In the case of straw, a combine harvester unloads harvested material that is not grain from the rear of the combine, which forms the straw (eg wheat or oat straw) that will be picked up by the baler. The cut harvest material is usually raked and dried, and a baler, such as a large square baler or a round baler, travels astride and along the windrows to pick up the bales and make them into bales.
    In the case of a large square baler, a pick-up unit at the front of the baler collects the harvested material from the ground, cut into windrows. The pick-up unit contains a pick-up roller and may optionally contain other components such as lateral shields, unilaterally supported short jacks, a windshield etc. A packer unit is used to feed the harvest material from the pick-up unit to a tube or pre-compression chamber. The packer unit forms a plug of harvest material within the pre-compression chamber which is then transferred to a main bale chamber. For this discussion, the load of harvest material in the pre-compression chamber will be called a "plug", and the load of harvest material after being compressed within the main bale chamber will be called a "slice". Typically, such a packer unit includes teeth or forks to move the harvest material from the pick-up unit into the pre-compression chamber. Instead of a packer unit, the use of a rotor cutting unit is also known which can chop the harvest material into smaller pieces.
    A filling unit transfers the plug of harvesting material in loads from the pre-compression chamber to the main bale chamber. Typically, such a filling unit contains filling forks that are used to transfer the plug of harvest material from the pre-compression chamber to the main bale chamber, synchronous with the reciprocating movement of a plunger within the main bale chamber. In the main bale chamber, after the plug of material has been moved into the main bale chamber, the plunger compresses the plug of harvest material into a slice against previously formed slices to form a bale, and at the same time, the bale gradually moves to the exit end of the bale chamber.
    The bale chamber usually contains three moving walls, namely the top and the two sides, which can be positioned by two hydraulically controlled actuators connected to a positioning mechanism. The pressure exerted by the walls of the bale chamber determines the frictional force required to overcome static friction and to move the slices in the chamber. An increased force to move the slices causes the plunger to press the slices closer together, thereby producing a bale with a higher density.
    When enough slices have been added and the bale reaches a full (or other predetermined) size, a number of knots are activated that wrap rope, yarn or the like around the bale and tie it while the bale is still in the main bale chamber. The rope is cut and the formed bale is ejected from the back of the baler when a new bale is formed.
    Under normal circumstances, this arrangement works well if the frictional force of the ceiling and walls against the bale being compressed provides the necessary back pressure to achieve the desired density of harvest material in the bale. However, under difficult bale-forming conditions, insufficient back pressure may be present near the inlet end of the bale chamber closest to the plunger. As a result, the harvest material can expand in the direction of the plunger after the plunger has compressed it. In addition, the ceiling can be depressed too low by the hydraulically controlled actuators, resulting in a bad bale shape, and failure of the twine by re-expansion of the harvest material due to insufficient compression after the bale leaves the large square baler. Similarly, one or both walls can be pressed in too far inwards by the hydraulically controlled actuators, with similar results.
    What is required according to the prior art is a way to increase the back pressure on the bale while the bale is being formed and compressed near the entrance end of the bale chamber closest to the plunger, so that the bale has the full cross section of the bale bale chamber, and to achieve greater compression and higher density of the harvest material.
    SUMMARY OF THE INVENTION
    This invention provides such a way to increase the back pressure on the bale while the bale is being formed and compressed near the entrance end of the bale chamber closest to the plunger.
    In one form, the invention is directed to a baler that contains a bale chamber for compressing harvest material into bales. The bale room contains a floor, a ceiling and two walls. A plunger borders the bale chamber and forces harvest material into it. An actuator system presses the ceiling and the two walls of the bale chamber inwards against the harvest material while it is pressed into bales. At least one retractable friction block is arranged in the ceiling and / or in one or both walls, and is used to increase the compression and density of the harvest material at the entrance end of the bale chamber. The at least one retractable friction block can be operated to be extended inwards to enhance the movement inwards of the ceiling or walls by the actuator system.
    An advantage of this invention is that it results in higher compression of the harvest material in the bale, which leads to a higher bale density. Another advantage of this invention is that failure of the twine rope occurs, which often happens when an insufficiently compressed and poorly shaped bale expands again after the bale has left the large square baler.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The above and other features and advantages of this invention and the way to achieve them will become more apparent and the invention will be better understood by reference to the following description of an embodiment of the invention, together with the accompanying drawings, characterized in that :
    Figure 1 is a cut-away perspective view showing the internal action of a large square baler containing a bale chamber;
    Figure 2 is a partial exploded view illustrating the bale chamber of Figure 1;
    Figure 3 is a perspective view of the bale chamber of a large square baler according to a representative embodiment of the invention;
    Figure 4 is a rear view of the bale chamber of a large square baler according to a representative embodiment of the invention;
    Figure 5 is a perspective view of the ceiling and walls of a large square baler with retractable friction blocks according to a representative embodiment of the invention;
    Figure 6 is a side view of the ceiling of a large square baler with retractable friction blocks according to a representative embodiment of the invention;
    Figure 7 is a perspective view of retractable friction blocks according to a representative embodiment of the invention;
    Figure 8 is a perspective view of the ceiling of a large square baler with retractable friction blocks according to a representative embodiment of the invention;
    Figure 9 is another perspective view of the ceiling of a large square baler with retractable friction blocks according to a representative embodiment of the invention;
    Figure 10 is a rear view of the ceiling of a large square baler with retractable friction blocks according to a representative embodiment of the invention;
    Figure 11 is a bottom view of the ceiling of a large square baler with retractable friction blocks according to a representative embodiment of the invention; and
    Figure 12 is a view of the inside of a wall of a large square baler with retractable friction blocks according to a representative embodiment of the invention.
    Corresponding references (numbers and / or letters) indicate corresponding parts throughout all the different views. The examples set forth herein illustrate embodiments of the invention and such examples should not be construed as limiting the scope of the invention in any way.
    DETAILED DESCRIPTION OF THE INVENTION
    Referring now to the drawings and more particularly to Figure 1, a harvesting machine is shown in the form of a large square baler 10. Figure 1 is an exploded perspective view showing the internal action of a large square baler 10. The large square baler 10 operates with a two-stage supply system. Harvesting material is lifted from windrows by means of a pick-up unit 12 and supplied to the large square baler 10. The pick-up unit 12 includes a rotating pick-up roller 14 with tines 16 that move the crop backwards to a packer unit 18. An optional pair of unilaterally supported short jacks (one of which is shown but not numbered) is positioned above the rotating pick-up roller 14 laterally around the harvesting material to move inwards. The packer unit 18 includes packer teeth 20 which press the crop into a pre-compression chamber 22 to form a plug of harvest material. The packer teeth 20 entwine the crop and pack it together in the pre-compression chamber 22. The pre-compression chamber 22 and the packer teeth 20 act as the first step of compressing the crop.
    Once the pressure in the pre-compression chamber 22 reaches a predetermined measured value, a filling unit 24 moves the plug of crop from the pre-compression chamber 22 to a bale chamber 26. The filling unit 24 comprises filling forks 28 which directly press the plug of crop up to a plunger 30, which within the bale chamber 26 moves back and forth and compresses the plug of crop into a slice. The filling forks 28 return to their original stationary condition after the plug of material has been moved into the bale chamber 26. The plunger 30 compresses the crop plugs to form a bale, and at the same time, the bale gradually moves to an exit end 32 of the bale chamber 26. The bale chamber 26 and the plunger 30 function as a second stage for compressing the crop. When enough slices have been added and the bale has reached a full (or other predetermined) size, the knots 34 are operated which tie rope around the bale while it is still in the bale chamber 26. Needles 36 raise the lower rope to the knots 34 after which the knotting process takes place. The rope is cut and the formed bale is ejected from a discharge ramp 38 when a new bale is formed.
    Referring now to Figure 2, a particular frame of the large square baler 10 is disclosed with the bale chamber 26 illustrated in an exploded view. Bale chamber 26 is defined by a floor 42, a ceiling 44 and walls 46, 48. Ceiling 44 of the bale chamber 26 is sometimes referred to as the "upper door" in the prior art, and walls 46, 48 are sometimes referred to as the state of the technique is called "side doors". For the sake of clarity in this application, however, the terms "ceiling" and "walls" will be used, although it is to be understood that the respective terms are interchangeable. For this discussion, floor 42 will be considered fixed with respect to the frame, and ceiling 44 and walls 46, 48 are movable by the action of a density ring actuator system 50. The bale chamber 26 has a cross-section that is variable as determined by density ring actuator system 50. The ceiling 44 and the walls 46, 48 are shown in Figure 2 in the expanded state thereby creating a widening so that a bale can easily pass through the bale chamber 26. In normal use, the bale chamber 26 is positioned by the density ring actuator system 50 such that it narrows, leading to a decreasing cross-section as the bale moves through the bale chamber 26. Controlling the cross-section of the bale chamber 26 results in controlling the density of the bale that is formed in the bale chamber 26, since a more narrowly narrowed configuration increases the resistance to bale movement.
    The floor 42, the ceiling 44 and the walls 46, 48 each contain at least one structural element 52 which extends along a bale forming direction 70. The structural elements 52 comprise the bale and serve to limit the movement of the bale as it moves through the bale chamber 26. Each of the structural elements 52 includes a compression zone 64 whose inner surface narrows inward toward the bale chamber 26, and a holding zone 68 where the inner surface becomes wider with respect to the bale chamber 26. In practice, the actuator system 50 holds the density ring the ceiling 44 and the walls 46, 48 at a slight angle inwards, so that the constriction of the compression zone 64 is somewhat more pronounced, and the widening of the holding zone 68 is reduced so that it becomes more or less parallel to the bale forming direction 70.
    For the sake of clarity, the plunger 30, also referred to as compression or compression device 30, is not shown in Figure 2. The plunger 30 presses the plug against the preformed slices and thus causes a movement of the forming bale in the bale forming direction 70. This compression of the harvest material in the bale, more specifically in the compression zone 64, results in a force which via the harvest material transferred to the structural elements 52. When the plunger 30 withdraws, there is a certain resilience of parts of the bale and the resulting reduced force on the bale is also felt by the structural elements 52. The structural elements 52 are retained by support elements illustrated here as the support elements 54 and 60, which hold the structural elements 52 connected to the ceiling 44, and the support elements 56 and 58, which hold the structural elements 52 connected to the wall 48. In such a way, the structural elements 52 connected to the wall 46 are limited in their movements.
    With reference to Figures 3 and 4, the operation of the bale chamber 26 of the large square baler 10 is further detailed.
    As can be seen, the density ring actuator system 50 is operated by at least one hydraulic ring 62 of the density ring, as shown in Figure 3 as two such hydraulic ring cylinders 62 of the density ring, positioned on each wall 46, 48. The actuator system 50 of the density ring presses the structural element 52 of both the ceiling 44 and the walls 46, 48 inwards. These pivot downwardly around support elements 58 and 60 (see Figure 2) at the entry end 40 of the bale chamber 26 closest to the plunger 30 (see Figure 1). This downward force generated by the density ring actuator system 50 produces a frictional force between the ceiling 44 and the walls 46, 48 and the bale that is compressed when slices are added to it and when the plunger 30 pushes it through the bale chamber 26.
    Under normal circumstances, this arrangement works well if the frictional force of the ceiling 44 and the walls 46, 48 against the bale being compressed, in particular in the compression zone 64, generates the back pressure necessary to achieve the desired density of the crop material in the to achieve. However, under difficult baling conditions, there may be insufficient back pressure in the compression zone 64 in the vicinity of the entry end 40 of the bale chamber 26 that is closest to the plunger 30. As a result, the harvest material can expand in the direction of the plunger after the plunger has compressed it. In addition, the ceiling 44 can be depressed too low by the density ring actuator system 50, resulting in a bad bale shape, and the twine collapses when the bale leaves the large square baler 10 at the time the harvest material re-expands due to insufficient compression during the bale formation. Similarly, one or both walls 46, 48 can be pressed in too far inwards by the density ring actuator system 50, with similar results.
    The problem is due to the fact that the angle between the compression zone 64 and the holding zone 68 is too small for some circumstances. In good conditions with a good top filling of harvesting material, the inner surface of the ceiling 44 and the walls 46, 48 in the holding zone 68 will generally run parallel to the floor 42 in the bale forming direction 70. Because the top filling of harvesting material is good, sufficient force exerted on the harvest material while it is formed into a bale in the compression zone 64 near the entrance end 40 of the bale chamber 26 that is closest to the plunger 30. However, if the top filling of the harvest material is insufficient, then the amount of force that can be applied to the harvest material in the compression zone 64 may also become insufficient for good compression and bale formation.
    Under difficult bale forming conditions, it is advantageous to increase the angle of narrowing of both the ceiling 44 and the walls 46, 48 to achieve earlier contact with the crop and to increase compression and back pressure to ensure good bale formation. However, both the ceiling 44 and the walls 46, 48 are made in one piece so that, by using the density ring actuator system 50 to increase the constriction in the compression zone 64, the force also increases and the cross-section decreases, in particular the heights of the ceiling 44 in the retaining zone 68 near the exit end 32.
    The inventors have found that by increasing the counter pressure on the bale while the bale is being formed and compressed in the vicinity of the entry end 40 of the bale chamber 26 that is closest to the plunger 30, a greater compression and a higher density becomes such that the bale fills the entire cross-section of the bale chamber 26. As a result, the ceiling 44 and the walls 46, 48 can produce the appropriate resistance under the pressure generated by the density ring actuator system 50.
    To achieve this, retractable friction blocks 72 are provided which extend through structural elements 52 of the ceiling 44 and / or the walls 46, 48, behind a bend 66 (see Figure 6), indicate a transition between the compression zone 64 of the bale chamber 26 and the retention zone 68 of the bale chamber 26. Each retractable friction block 72 is operated by the associated hydraulic cylinder 74. The retractable friction blocks 72 pivot to create a restriction against the passage of harvest material while being compressed and to act as a pawl around the prevent backward movement of the crop material when the plunger 30 is withdrawn. Furthermore, the reaction forces of the retractable friction blocks 72 against the harvest material help to keep the ceiling 44 and the walls 46, 48 in a normal position, that is, not excessively downward or inward as would otherwise be the case under certain bale forming conditions or harvest material conditions. When using the retractable friction blocks 72, the blocks will press on the slab in the bale chamber 26 and, as a reaction to this force, they will push the ceiling 44 and / or the walls 46, 48 out and return them back to a normal position. In this way, the necessary pressure to be generated by the density ring actuator system 50 can still be achieved, but it is transmitted to the crop via the friction blocks 72. The position of the retractable friction blocks 72 behind the bend 66 is preferred since in this position the amount of force applied to the slab will have the most impact on the repositioning of the ceiling 44 and / or the walls 46, 48. An operating system 100 is connected to the hydraulic cylinders 74 of the retractable blocks, which electric, electronic, hydraulic or a combination thereof. For the sake of simplicity, the operating system 100 shown in Figure 3 is shown as being connected to a cylinder of the wall 48, but it is understood that the operating system 100 is connected to each hydraulic cylinder 74 of each retractable block . The operating system 100 can be operated to extend the retractable friction blocks 72 if the conditions of the harvesting material with regard to bale formation tend to cause the harvesting material not to fill the full cross-section of the bale chamber 26 or if insufficient compression and density occur. The operating system 100 can be operated to extend all retractable friction blocks 72 together, or, more preferably, it can be operated such that it extends a subset of retractable friction blocks 72, such as those in the ceiling 44 or in one or both walls 46, 48 or even a part of the friction blocks 72 in the ceiling 44 and / or in one or both walls 46, 48.
    In particular, if the harvest material tends not to fill the bale chamber 26 against the ceiling 44, or tends to create insufficient density at the top thereof, the ceiling 44 will tend to sink too low below the pressure of the density ring actuator system 50. The operating system 100 senses this, by means of position sensors 92 and extends the upper retractable friction blocks 72. This causes the ceiling 44 to be pushed upward by the reaction force of the upper retractable friction blocks 72, and results in a better bale formation and a more desired density of the crop material at the top of the bale. It also allows the bale to fill its entire cross-section so that under pressure created by the density ring actuator system 50, the ceiling 44 can again generate the appropriate resistance with the desired back pressure as a result.
    Similarly, if the harvest material tends not to fill the bale chamber 26 against one of the walls 46, 48, or tends to achieve insufficient density on that side, the respective wall 46, 48 will tend to to move too far in under pressure from the density ring actuator system 50. The operating system 100 also feels this by means of. position sensors 94 and extends the retractable friction blocks 72 into said wall 46, 48. This again results in the respective wall 46, 48 being forced out by the reaction force of the retractable friction blocks 72, and results in a better bale formation and a more desired density of the harvest material along that side of the bale. It also makes it possible to form the bale so that it reaches its full cross-section so that the respective wall 46, 48 can again generate the appropriate resistance under the pressure generated by the density ring actuator system 50.
    It can thus be seen that the operating system 100 can establish a relationship between the pressure in the hydraulic cylinders 74 of the retractable block and the downward or inward position of the respective ceiling 44 or the respective wall 46, 48. In other words, the operating system 100 responds to an exaggerated downward or inward position of the respective ceiling 44 or walls 46, 48, by increasing the pressure in the corresponding hydraulic cylinders 74 of the retractable blocks. Alternatively, the operating system 100 may respond to too low a pressure exerted by the bale against the respective ceiling 44 or the respective walls 46, 48 by increasing the pressure in the corresponding hydraulic cylinders 74 of the retractable blocks.
    This can be achieved by applying at least two different working pressures in the corresponding sets of hydraulic cylinders 74 of the retractable blocks, one for the ceiling 44, and another working pressure for the walls 46, 48. Alternatively, this can be achieved by using three different operating pressures can be operated in the corresponding sets of hydraulic cylinders 74 of the retractable blocks, one for the ceiling 44, another operating pressure for one wall 46 and a third for the other wall 48. But also now this can be done completely hydraulically by the operating system 100 happening or by a combination of electrical, electronic and / or hydraulic controls connected to the hydraulic cylinders 74 of the retractable blocks. Alternatively, each hydraulic cylinder 74 of the retractable blocks can operate with an individual operating pressure to enable individual operation of the blocks 74.
    The hydraulic cylinders 74 of the retractable blocks or the hydraulic controls connected thereto can be equipped with one or more hydraulic buffer vessels 102 and / or pressure relief valves 104. In this way, the hydraulic buffer vessel 102 can collide the plunger 30 against the bale. compensate by slightly retracting the retractable friction blocks 72 and thereby limiting the forces experienced by the retractable friction blocks 72, the plunger 30 and the other parts of the large square baler 10. Similarly, the pressure relief valves 104 can limit such excessive pressure should this occur.
    With reference to Figures 5 to 12, the operation of the retractable friction blocks 72 is shown in more detail. Each retractable friction block 72 pivots around an associated hinge 80 and includes a lever arm 82. The retractable friction block 72 either comes flush with the inner surface of the ceiling 44 or the wall 46, 48, or extends into the bale chamber 26 depending on the position of the retractable block hydraulic cylinder 74 operating via the lever arm 82. Note that some of the retractable friction blocks 72 rotate inward when the retractable block hydraulic cylinders 74 extend, for example, those mounted in the ceiling 44 while some of the retractable friction blocks 72 rotate inward when the hydraulic cylinders 74 of the retractable blocks retract, for example, those mounted in the walls 46, 48. However, any combination of pressure and tension arrangements can be considered as desired. The retractable friction block 72 is in a recess 76 on the inside of the structural element 52, and the lever arm 82 extends through a slot 78 in the opposite side of the structural element 52. The hydraulic cylinder 74 of the retractable block is further attached to a cylinder mounting bracket 84. The retractable friction block 72 is generally placed closer to the bend 66 in the bale chamber 26 than at the exit end 32 of the bale chamber 26, the bend 66 indicating a transition between the compression zone 64 of the bale chamber 26 and the holding zone 68 of the bale chamber 26.
    Each retractable friction block 72 can be equipped with a sensor that provides control system 100 with information about its position. This can be a position sensor inside the hydraulic cylinder 74 of the retractable block (not shown). As an alternative example, it may be an angle sensor 86 connected to the retractable friction block 72 by an angle sensor connecting rod 88 connected to the lever arm 82. The angle sensor 86 is mounted on an angle sensor bracket 90 and can be connected to the operating system 100 (not shown in Figures 5 to 12). In this way, information regarding the position of each retractable friction block 72, alone or in combination with information regarding the pressure in the hydraulic cylinders 74 of the retractable blocks, concerning the downward or inward position of the respective ceiling 44 or the respective walls 46, 48, and / or information regarding the pressure in the hydraulic cylinders 62 of the density ring (not shown in Figures 5 to 12), are used by the operating system 100 to operate the retractable friction blocks 72 and / or the hydraulic cylinders 62 of the density ring.
    Although this invention has been described with respect to at least one embodiment, this invention can be further modified to include other embodiments, such as actuator types other than hydraulic actuators, e.g., pneumatic or electric. Another such alternative embodiment may be the use of a hand-operated device such as a rod, the length of which is adjustable by the user, instead of hydraulic cylinders to operate the hydraulic cylinders of the retractable blocks. This patent application is therefore intended to cover all variations and uses or modifications of the invention by making use of its general principles. Furthermore, this patent application is intended to cover such deviations from this disclosure that are possible within known or customary practices of the prior art to which this invention relates and which fall within the limits of the appended claims.
    权利要求:
    Claims (15)
    [1]
    CONCLUSIONS
    A baler for agricultural use (10), comprising: a bale chamber (26) for baling crop material into bales, the bale chamber (26) having a bottom (42), a ceiling (44) and two walls (46) , 48); a plunger (30) adjacent to the bale chamber (26) to force the harvest material into the bale chamber (26); an actuator system (50) that is operated to press the ceiling (44) and the two walls (46, 48) inwards against the harvest material while being made into a bale; at least one retractable friction block (72) mounted in the ceiling and / or in a wall (46, 46) to increase the compression and density of the crop material at the entry end (40) of the bale chamber (26) characterized by: the at least one retractable friction block (72) can be operated to be extended inwards to enhance the movement inwards of the ceiling (44) or walls (46, 48) by actuator system (50).
    [2]
    Baler (10) according to claim 1, characterized in that the ceiling (44) and / or the two walls (46, 48) contain a compression zone (64) and a holding zone (68) defined by a bend (66), wherein the at least one retractable friction block (72) is disposed in the retaining zone (68) of the ceiling (44) and / or the two walls (46, 48).
    [3]
    The baler (10) according to claim 2, characterized in that: the at least one retractable friction block (72) is placed in a holding zone (68) closer to the bend (66) in the ceiling (44) and / or the two walls (46) , 48) from the bale chamber (26) then at an exit end (32) from the bale chamber (26).
    [4]
    The baler (10) according to claims 1 to 3, characterized in that: the at least one retractable friction block (72) is operated by an actuator (74) that operates with a fluid.
    [5]
    The baler (10) according to claims 1-4, characterized in that: the at least one retractable friction block (72) is operated by a hydraulic cylinder (74).
    [6]
    The baler (10) according to claims 1-5, characterized in that: the at least one retractable friction block (72) is operated by an operating system (100).
    [7]
    The baler (10) according to claim 6, characterized in that: the operating system (100) is fully hydraulic or is a combination of an electrical and a hydraulic control.
    [8]
    Baler (10) according to claims 1 to 7, characterized in that: the at least one retractable friction block (72) further comprises: - at least one retractable friction block (72) arranged in the ceiling (44) of the bale chamber (26) ); - at least one retractable friction block (72) disposed on the first wall (46) of the bale chamber (26); and - at least one retractable friction block (72) disposed in a second wall (48) of the bale chamber (26);
    [9]
    A baler (10) according to claim 8, characterized in that: all friction blocks (72) arranged in the ceiling (44) of the bale chamber (26) can be operated to extend and retract together; all friction blocks (72) arranged in the first wall (46) of the bale chamber (26) can be operated to retract and extend together again; and all friction blocks (72) disposed in the second wall (46) of the bale chamber (26) can be operated to retract and extend together again;
    [10]
    The baler (10) according to claim 8, characterized in that: all friction blocks (72) can be operated to extend individually and retract.
    [11]
    The baler (10) according to claim 8, characterized in that: each retractable friction block (72) is operated by hydraulic cylinders (74), two different operating pressures being applied to the hydraulic cylinders (74), one operating pressure being applied to the hydraulic cylinders (74) to operate the retractable friction blocks (72) arranged in the ceiling (44) of the bale chamber (26), and a different operating pressure is applied to the hydraulic cylinders (74) around the retractable friction blocks (72) to be arranged in the walls (46, 48) of the bale chamber (26); and wherein any working pressure can be applied to increase the inward movement of the ceiling (44) or walls (46, 48) through the actuator system (50).
    [12]
    The baler (10) according to claim 8, characterized in that: each retractable friction block (72) is operated by hydraulic cylinders (74), wherein three different operating pressures are applied to the hydraulic cylinders (74), one operating pressure being applied to the hydraulic cylinders (74) to operate the retractable friction blocks (72) arranged in the ceiling (44) of the bale chamber (26) and a different operating pressure is applied to the hydraulic cylinders (74) around the retractable friction blocks (72) operating in the first wall (46) of the bale chamber (26), and a different operating pressure is applied to the hydraulic cylinders (74) around the retractable friction blocks (72) located in the second wall (48) of the bale chamber (26) are operable; and wherein any working pressure can be applied to increase the inward movement of the ceiling (44) or walls (46, 48) through the actuator system (50).
    [13]
    The baler (10) according to one or more of the preceding claims, characterized in that: the at least one retractable friction block (72) is further equipped with at least one hydraulic buffer vessel (102) and a pressure relief device (104) to collide the plunger (30) to compensate against the bale by allowing the at least one retractable friction block (72) to retract to limit forces against the at least one retractable friction block (72).
    [14]
    The baler (10) according to one or more of the preceding claims, characterized in that: the at least one retractable friction block (72) is further provided with a position sensor (86).
    [15]
    Method for operating the baler (10) according to one or more of the preceding claims, the method comprising the following steps: - determining an inward displacement of the ceiling (44) and / or the two walls (46, 48); and - increasing an inward pressure and / or an inward rotation of the at least one retractable friction block (72) based on the inward movement of the ceiling (44) and / or the two walls (46, 48).
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    PCT/EP2016/065540| WO2017005635A1|2015-07-03|2016-07-01|Retractable blocks in the doors of a large square baler|
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