FR2771256A1 - DEVICE AND METHOD FOR COMPRESSING HARVESTING PRODUCT - Google Patents

Abstract

Device and method for compressing crop product, comprising means for picking up crop product and transporting it to a compression chamber 3, a casing 1 forming the compression chamber 3, a flap 5 pivotally mounted on the casing 1, at least one fluid cylinder 7, 7 'for actuating the shutter 5 and means 12 for controlling the cylinder 7, 7'. An accumulator 19 for accumulating a predetermined volume of pressurized fluid is arranged between an actuating valve 14 and the cylinder 7, 7 '. Application: in particular for the compression of round bales.

Description

Device and method for compressing crop product

  The invention relates to a device for compressing the crop product, in particular in the form of round bales, comprising movens for collecting the crop product and transporting it in a compression chamber, a casing forming the compression chamber. , a flap pivotally mounted on said casing, at least one pressurized fluid cylinder for actuating the flap and

  means for controlling the fluid cylinder.

  Known devices for the compression of crop product have a pick-up drum commonly called pick-up, which picks up the crop product from the ground and transmits it to a rotor conveying the product uniformly in a compression chamber surrounded by a casing. The casing has a flap for opening the casing, so that after the compression operation has been completed, the compressed crop product can be brought out of the casing by opening the flap. To open and close the shutter, the latter is connected to the casing by passing through at least one fluid cylinder. In order to close the shutter, an actuating valve is brought to the closed position, so that the pressurized fluid is sent from a source of pressurized fluid to a first working connection of the fluid jack. During the compression operation, the pressurized fluid cools in the fluid cylinder. The stress on the fluid cylinder increases as the filling of the compression chamber increases, so that the piston of the cylinder is moved. This results in an undesirable opening of the flap

  again during the compression operation.

  The object of the present invention is to improve a device for the compression of crop product such that an opening of a shutter during the compression operation is effectively prevented and that

  the shutter is kept closed reliably.

  For this purpose, on the device according to the invention, a

  accumulator used to accumulate a predetermined volume

  mined with pressurized fluid is placed between the valve

  actuator and the fluid cylinder.

  The invention is based on the observation that the arrangement of an accumulator in the pressurized fluid circuit makes it possible to compensate for the appearance of possible pressure drops during 1 compression oparation. The forecast i oni of accumulated l ate lr with a volume adapted to the size of the fluid cylinder allows cd'intretenir with certtitde a minimum pressure such inside the fluid cylinder that said cylinder is able to resist the thrust antagonist acting in the direction of (opening-e under the effect of filling the compression chamber with the harvested product and the shutter is thus held securely

  in the closed position during the compression operation.

  According to another characteristic of the invention, a non-return valve is disposed between the accumulator and the fluid cylinder, so that when the pressure increases at the end of the compression operation, the fluid cannot escape from the fluid cylinder in

1 accumulator.

  According to another characteristic of the invention, a pressure reducing valve is disposed between the forward pipe and the return pipe, which prevents pressure peaks under the effect of the push that the crop product exerts on the shutter, and therefore an overload of

pressurized fluid circuit.

  Preferably, the accumulator is connected to the outward pipe by which the fluid cylinder can be brought to an extreme position corresponding to the closed position of the flap. The non-return valves can be associated exclusively with a single pressurized fluid line and be arranged reciprocally so that the accumulator can be filled with pressurized fluid in the position of the actuating valve producing the

shutter closing.

  The accumulator, the non-return valves and the pressure limiting valve sound. advantageously arranged

  cofllointemlent in the housing area.

  The invention also relates to a product compression method. harvesting, which guarantees a flexible closure on the side of the cart during the compression of the product

r, c C) 1O t e.

  The process according to the invention is characterized in that a predetermined terminal volume of fluid under pressure is accumulated in a battery ((ulatorl in the po) sitionl for closing the fluid cylinder and that the fluid under pressure is automatically brought from the accumulator into the fluid cylinder as a function of the quantity of fluid under pressure that the fluid cylinder must receive in order to keep the shutter in the closed position. Because the fluid under pressure is accumulated in the flow line, in an accumulator, a possible drop in pressure in the fluid circuit can be quickly compensated for. By choosing the size of the accumulator, it is possible to maintain in the go pipe a minimum pressure ensuring an uninterrupted closing of the

  flap during the compression operation.

  According to another characteristic of the process, the pressurized fluid is brought to the accumulator only in the position of the actuating valve producing closure of the flap and the pressurized fluid accumulated in the accumulator is retained in the valve position actuation producing the opening of the shutter. This allows a simple and economical mode of filling or holding

filling the accumulator.

  Referring to the accompanying drawings, we will describe below

  after in more detail two embodiments of the invention; in the drawings: FIG. 1 is a schematic representation of a device according to the invention with a control circuit according to a first embodiment example, and FIG. 2 represents a circuit of commianide according to a second embodiment example - device The device for compressing the harvested product is (pf) reference produced in the form of a round baler. It includes a casing 1 which initiates a constant volume chamber for the reception of the green product to be compressed. As shown in Figure 1, the housing 2 is mounted on a

  wheeled axle 2 and is pulled r) ar a tractor not shown.

  The casing 1 has at the front in the direction of movement an opening through which the crop product is brought

  in the compression chamber 3 formed by the casing 1.

  To collect the harvested product, the device comprises a pickup drum or pick-up 4 which transports the harvested product, passing through a rotor not shown, in the compression chamber 3 of the casing 1. At the end of the operation compression, the compressed crop is, after pivoting up a rear flap 5 pivotally mounted on the housing 1, ejected from the housing 1 by a

  large opening on the rear side of the device.

  A fluid cylinder produced in the form of a hydraulic cylinder 7, 7 ′ is provided in the area of each of the side walls

  6 of the device for pivoting the rear flap 5.

  The upper free end 8, 8 'of the piston rod 9, 9' of each cylinder 7, 7 'is rigidly fixed to the rear flap 5. The hydraulic cylinders 7, 7' each have

  two working connections 10, 10 'and 11, 11', connected respectively

  tively to the same control circuit 12. The control circuit 12 is connected by a coupler 13 to hydraulic connections of a tractor not shown. A pump, not shown from the tractor, supplies the hydraulic circuit via an actuation valve 14 produced in the form

distributor 4/3.

  At the start of a compression operation, the actuating valve 14 is brought to a position (closed position) producing the closing of the rear flap 5. In this closing position, the fluid is hvrauijl iqlue is e5nvoy aux i 'ac.otrds of t.work 10, 10' by not s health by united leads to ll er 15 which contains uln cl. ap ati-ret-olr 1i céverrotiillable. The hydraulic cylinders 7, 7 ′ are thus brought into a closed position in which the rear flap 5 is applied under prestress against the edge of the rear opening, ur closed (arter 1. At the same time, clu hydraulic fluid can be brought by i a poi.t of bifurcatioon 17 and a non-return valve 20 to an accumulator 19, for the purpose of filling the latter Then, the actuating valve 14 is brought to a neutral median position, as shown. of the device using the tractor, the crop product is gradually transported into the compression chamber 3. Due to the cooling of the hydraulic fluid, the pressure of the latter decreases, however, as the degree of filling compression chamber 3 increases, the

  mechanical stress on the rear flap 5 increases.

  The accumulator 19 supplies the hydraulic fluid necessary to prevent the opening of the rear flap 5 with the formation of a slit through which the crop product could escape from the compression chamber 3, so that the piston rods 9 , 9 'remain in position

  closing, despite the push they undergo. The accumulator 19 therefore compensates for a pressure drop inside the hydraulic circuit and thus prevents inadvertent opening of the rear flap 5.

  Between the accumulator 19 and the supply line 15 is arranged a non-return valve 18 which prevents the hydraulic fluid from escaping into the accumulator 19. At the end of the compression operation, the compressed crop product is bound and after opening the rear flap 5 by actuating the actuating valve 14, the compressed and bound crop product is ejected, in the position of opening the flap through the rear opening & re of the casing 1. For pre'vn ir a increase d. illegal entry. e in the cirri-cotta of comriandoe 12 linei valve, I imitatiJiou of pt-e; si. on 22 is arranged elnt re the cond i iito alle o 15 and ill C (wavy back 21. I, 'op'rateonr is warned by a soinal of the end of operat ion of compre essi oni ui de i' oprat. io d.] iage. By] the subsequent displacement of the actuating valve 14 to its po) sition of fermeturo, the hlydrauli fluid (-e is enlv) ové of the pump to the connections cie work Il, 11 'des hydraulic verinrs 7, 7 ', the non-return valve 16 being unlocked by passing through a control pipe. The hydraulic fluid can then return from the working fittings 10, 10 ′ by the coupler 13 in a non-reservoir

depicted from the tractor.

  In a second embodiment of the device according to FIG. 2, a control circuit 23 is provided with only two non-return valves. The elements of the second embodiment which correspond to those of the first embodiment bear the same references. A bifurcation pipe 25 going to the accumulator 19 starts from an inlet pipe 24 at a bifurcation point 26. The unlockable non-return valve 16 as well as the pressure limiting valve 22 are arranged on the side of the point

  bifurcation 26 facing the hydraulic cylinders 7, 7 '.

  An additional unlockable non-return valve 27 is arranged on the side of the bifurcation point 26 remote from the hydraulic cylinders 7, 7 '. In the case of this control circuit 23, the non-return valve 16 also assumes the function of the non-return valve 20 of the first embodiment. Filling of the accumulator 19 during the compression operation is effectively prevented. In the open position of the actuating valve 14, the non-return valves 16, 27 are unlocked and allow

  thus the hydraulic fluid to return to the tank.

Claims (9)

  1. Device for the compression of crop product, in particular in the form of round bales, comprising means for collecting the crop product and transporting it in a compression chamber, a casing forming the compression chamber, a pivotally mounted flap on said body, at least one pressurized fluid cylinder for actuating the shutter and means for controlling the fluid cylinder, characterized in that an accumulator (19) for accumulating a predetermined volume of pressurized fluid is arranged between an actuation valve (14) and   the pressurized fluid cylinder (7, 7 ').   2. Device according to claim 1, characterized in that a non-return valve (16, 18) is disposed between the accumulator (19) and the pressurized fluid cylinder (7, 7 '). 3. Device according to claim 1 or 2, characterized in that at least one unlockable non-return valve (16, 27) is disposed between the actuating valve   (14) and the pressurized fluid cylinder (7, 7 ').   4. Device according to any one of the claims   1 to 3, characterized in that a pressure limiting valve (22) is arranged between a supply line (15) and a return line (21).   5. Device according to any one of the claims   1 to 4, characterized in that the accumulator (19) is connected to the supply line (15) by which the pressurized fluid cylinder (7, 7 ') capable of being brought to a pressure (7, 7 ') can be brought to an extreme position   corresponding to the closed position of the flap (5).   6. Device according to any one of claims   1 to 5, characterized in that the non-return valves (16, 18 20, 27) are exclusively associated with a single pressurized fluid line (15) and are arranged reciprocally so that the accumulator (19) can be filled with fluid under pressure in position 1.0 of the actuation valve (14) causing the closure of the flap (5).   7. Device according to any one of the claims I to 6, u'aractéri.se in that the accumulator (19), the anlt.iretour valves (16, 18, 20, 27) and the valve l: iniitati:) r pressure (22) ,; have disp Clar; the area of casing (]).   8. Method for compression of rcolt product. dlans a device c onprenant uni e chb'ede conprresioon formed) a '(housing, a pivoting flap closing the l, aite r being before compression brought and maintained under pr' (c) ntraainte in the closed position by actuation of '' at least one pressurized fluid cylinder arranged in a pressurized fluid circuit, characterized in that the pressurized fluid is accumulated in an accumulator (19) connected to the outward pipe (15) used for closing the shutter (5) and that is automatically brought from the accumulator (19) to the pressurized fluid cylinder (7, 7 ') the quantity of pressurized fluid necessary for the cylinder (7, 7') to maintain the shutter closed.   9. Method according to claim 8, characterized in that the accumulator (19) is filled with pressurized fluid in the position of an actuating valve (14) TO (c) 4; alOA tip ainaulLaj ap UoelTS od i e.4uepuodsalIoo 9c3 I, ZLZU01 992: l Xzz