BE1019639A3 - TYPE MACHINE COMPRISING A HYDRAULIC ENGINE FOR ROTATING A ACCESSORY. - Google Patents

Abstract

The present invention relates to a typical machine comprising at least one hydraulic motor (350) intended to drive an accessory in rotation. According to the invention, the machine comprises a hydraulic distributor (420) provided to reverse the direction of rotation of said hydraulic motor (350), the hydraulic distributor (420) being interposed on the two supply pipes (C3, C4) of said motor. , a control means (450) of said hydraulic distributor (420), the control means (450 being able to sense a pressure difference existing in the fluid circulating in two connecting pipes (C1, C2) between a control valve ( DC) and at least one other motor or hydraulic cylinder, to finish the hydraulic distributor (420) with a bistable control signal In this machine, a simple temporary actuation on the control valve suffices to reverse the direction of rotation of said hydraulic motor. The operator can thus choose the direction of rotation of said motor independently of the direction of operation of the other motor or hydraulic cylinder.

Description

Machine of the type comprising a hydraulic motor for rotation of an accessory

The present invention relates to a machine of the type comprising a hydraulic motor for rotatably driving an accessory. It has been interesting for the applicant to be able to easily reverse the direction of rotation of a hydraulic motor of a machine, for example by operating a control valve for controlling the operation of another engine or hydraulic cylinder.

Such a machine may take the form of a silage bucket for dispensing feed to animals. The bucket is coupled to a machine such as a tractor in order to extract a forage feed such as maize, silage grass from a silo, and load it into the bucket to then take it and distribute it to the animals. .

A dewatering bucket generally comprises a loading bucket, an operating arm that can be moved by at least one hydraulic cylinder and at the end of which is disposed a rotor for extracting material stored in the silo, this rotor being for this purpose, connected to a hydraulic motor to be rotated.

Two methods of filling such a bucket are also known. They are shown in Figs. 1 and 2. In both cases, the unloading bucket G is brought in front of the cutting edge of a silo S after having raised its operating arm B towards its release position, and then the operator , through a control valve present in the machine cab, the operation of the cylinder V so as to lower the maneuver B and the operation of the hydraulic motor M to rotate the rotor R. The movement descent of the arm B is shown by the arrow E.

In the first method, shown in FIG. 1, the hydraulic motor drives the rotor R in a direction of rotation, indicated by the arrow O-, so that it can extract material from the silo in order to propel it downwards, inside the bucket Gc loading.

In the second method, shown in FIG. 2, the hydraulic motor drives the rotor R in the other direction of rotation, indicated by the arrow 0+, where it extracts the material from the silo in order to propel it upwards, in the direction of a deflector D carried by the arm pivoting and which returns the material in the loading bucket Gc.

In the first method, the material is projected, not at the bottom of the bucket, but through its opening, because of the incidence of the teeth at the exit of the silo, so that it forms a pile T which overflows to the outside of the loading bucket Gc. A projection cone N materializes the limits of the product path towards the opening of the bucket Gc. A relatively large proportion of the extracted material can not be removed directly into the well. The operator must intervene to move the bucket and reload the material on the ground.

In the second method, the loading bucket Gc is properly filled because the material is judiciously returned by the deflector D in the bottom of the loading bucket Gc. However, when the heap is taken, the rotor projects up the material that falls on the silo's tarpaulin.

Also, the object of the invention is therefore to propose, in a general manner, a machine of the type comprising a hydraulic motor for driving an accessory, and which it is desired to be able to easily reverse the direction of rotation by using an auxiliary control such as a control distributor capable of controlling the operation of another engine or hydraulic cylinder.

The invention relates, in particular, to a dewatering bucket provided with a filling means which can correctly fill the loading bucket while avoiding the projection of material outside the loading bucket.

The invention further relates to a bucket for allowing the fragmentation of its contents during emptying and in particular a bucket for aeration compost.

For this purpose, there is provided a machine of the type comprising at least one hydraulic motor for rotatably driving an accessory; according to the invention, the machine comprises a hydraulic distributor arranged to reverse the direction of rotation of said hydraulic motor, the hydraulic distributor being interposed on the two supply lines of said motor, a control means of said hydraulic distributor, the control means being capable of sensing a pressure difference existing in the fluid flowing in two connection pipes between a control distributor and at least one other motor or hydraulic cylinder, to supply the hydraulic distributor with a bistable control signal.

In this machine, a simple temporary actuation on the control valve is enough to reverse the direction of rotation of said hydraulic motor. The operator can thus choose the direction of rotation of said motor independently of the direction of operation of the other engine or hydraulic cylinder.

According to an additional feature of the invention, the control means comprises a bidirectional hydraulic actuator connected to the two connecting pipes, a switch and / or a bistable pulse electrical relay arranged so that it can be actuated by said actuator to transmit a signal. bistable and delayed at the hydraulic distributor.

The hydraulic actuator acts as a time delay and works with the hydraulic energy used in the machine.

The duration of the actuator stroke determines the delay of the signal transmitted to the distributor.

The bistable pulse electrical relay provides the distributor with a signal in two stable logic states.

According to an additional feature of the invention, the hydraulic actuator is a double-acting hydraulic cylinder.

A cylinder of relatively small dimensions is suitable for this application.

According to an additional characteristic of the invention, the hydraulic distributor is of the 4/2 type and electrical control.

According to an additional characteristic of the invention, the hydraulic distributor is connected to the connection pipes of the control distributor.

By actuating the control valve, the flow direction of the hydraulic fluid is reversed or stopped through the hydraulic distributor, thus modifying the operation of the hydraulic motor.

In this way it is possible to control with a single control distributor, said hydraulic motor as well as the other motor or hydraulic cylinder.

According to an additional feature of the invention, the machine is in the form of a dewatering bucket or bucket for destructuring its contents during its emptying, comprising a loading / unloading bucket, a maneuvering arm its free end said hydraulic motor for rotating a rotor, the operating arm being hingedly mounted between a release position and a crimping position on the bucket, under the effect of a drive via at least one hydraulic cylinder.

In normal operation, that is to say when the unloading bucket is connected to the control valve, a simple temporary actuation on it is enough to reverse the direction of rotation of said hydraulic motor. The operator can thus choose the direction of rotation of the rotor to successfully load the bucket without any projection of material can be rescheduled on the silo cover.

The transmission of a delayed signal to the distributor gives the rotor time to stop before changing direction. In this way, the water hammers are avoided during the reversing phase of the hydraulic motor by the distributor.

According to an additional feature of the invention, said hydraulic motor and said hydraulic jack for driving the operating arm are connected to a hydraulic unit intended to be connected to the control valve.

According to an additional feature of the invention, a unidirectional flow restrictor is interposed on a supply pipe of said hydraulic motor to reduce the flow in one direction of fluid flow through said hydraulic motor and leave it normal in the other.

According to an additional feature of the invention, the operating arm carries a baffle for returning to the bottom of the bucket of the product extracted from a silo by the rotor in a direction of rotation of said hydraulic motor.

According to an additional feature of the invention, a non-return valve is installed downstream of the distributor on a distributor supply line.

When the cylinder or cylinders are fed in one direction, the hydraulic motor rotates and when they are fed in their other direction, the hydraulic motor is no longer running. We can then raise the maneuver arm without the engine scratching the silo.

According to an additional feature of the invention, a non-return valve is installed downstream of the distributor between the two supply lines so that said hydraulic motor can stop freely when no longer supplied.

According to an additional feature of the invention, the bucket is of the type intended to destructure its contents during its emptying and it comprises two hydraulic motors respectively provided for rotating two rotors held by the operating arm.

Actuating the control valve reverses the direction of rotation of the two hydraulic motors.

According to an additional feature of the invention, the bucket for destructuring its contents during its emptying is in the form of a compost aerating bucket.

The use of a compost aerating bucket accelerates the maturation of the compost.

The characteristics of the invention mentioned above, as well as others, will appear more clearly on reading the following description of an exemplary embodiment, said description being made in connection with the attached drawings, among which: FIG. . 1 is a side view of a first known type of unloading bucket, FIG. 2 is a side view of a second known type of unloading bucket, FIG. 3 is a side view of a silage bucket coupled to a machine, the bucket being provided with a maneuver arm holding a rotor and which is placed in the disengaged position according to the invention, FIG. 4 is a side view of a dewatering bucket according to the invention, FIG. 5 shows a side view of a silage bucket coupled to a machine, the operating arm holding the rotor being placed in a driving position of a slice of a silo, the rotor rotating in one direction according to the invention Fig. 6 shows a side view of a silage bucket coupled to a machine, the operating arm holding the rotor being placed in an intermediate extraction position of a slice of a silo, the rotor rotating in the other direction according to the invention, FIG. 7 shows a side view of a silage bucket coupled to a machine, the operating arm holding the rotor being placed in the folding position on the bucket according to the invention, FIG. 8 shows a view of a hydraulic diagram of a dewatering bucket according to the invention, FIG. 9 shows a view of a hydraulic diagram showing the output of cylinder rods and the rotation of a hydraulic motor in one direction, of a dewatering bucket according to the invention, FIG. 10 is a view of a hydraulic diagram showing the retraction of jack rods from a dewatering bucket and the stopping of a hydraulic motor according to the invention, FIG. 11 shows a view of a hydraulic diagram showing the stopping of the operation of a motor and jacks of a dewatering bucket according to the invention and, FIG. 12 shows a view of a hydraulic diagram showing the output of rods cylinders and the rotation of a hydraulic motor in the other direction of a dewatering bucket according to the invention.

The unloading bucket 100 shown in FIG. 3 is intended to be coupled to a machine E, provided with a lifting means for extracting a feed from a silo S, transport it and distribute it to animals.

It is composed, in FIG. 4, a bucket 200 for loading and unloading its contents and on which is mounted in an articulated manner, an operating arm 300 of a rotor 340 for taking the material on the front of a silo.

The bucket 200 comprises a front wall 202, a back wall 204 joined by a bottom wall 206 and two side walls 208 thus defining a container. This container is provided with a filling opening 210 surrounded between the front walls, dorsal and side walls. A fixing device 220, comprising flanges, is fixed on the back wall 204 to allow coupling of the unloading bucket 100 on the machine.

The operating arm 300 consists of two elements 302 arranged 1 vis-à-vis the other, joined by at least one cross member 304, each element being fixed at one end, and via a joint 306, on a side wall 208, near the free edge of the back wall 204.

The operating arm 300 is moved via at least one hydraulic cylinder 320, of the double-acting type, between a disengagement position visible in this FIG. 4 where the arm is disposed approximately in the extension of the back wall 204 and a folding position, visible in FIG. 7 where the rotor 340 is disposed near the front wall. In this FIG. 4, the cylinder 320 is mounted above the operating arm 300 to leave the filling opening 210 completely clear during the movement of the operating arm 300. When the cylinder rod 320 is retracted, the operating arm 300 is placed in its release position while when it is released, the operating arm is placed in its folding position.

In a preferred embodiment, the operating arm 300 is moved by two hydraulic cylinders 320a and 320b to balance the forces in it. The two cylinders are then connected in parallel as shown in FIG. 8.

Between its two extreme positions, the rotor 340 is able to extract a slice of a silo S in order to transfer the material thus withdrawn inside the bucket 200. Different working positions of the rotor are shown in Figs. 5, 6 and 7.

For this purpose, the rotor 340 is provided, as shown in FIG. 4, a plurality of teeth 342 disposed at the periphery of a cylinder. The rotor 340 is rotatable by means of a hydraulic motor 350 of the two-way flow type placed inside the cylinder. The rotor 340 can thus be driven in one direction of rotation or the other.

The hydraulic cylinders 320 and the hydraulic motor 350 are supplied with hydraulic fluid via the hydraulic circuit of the machine.

In FIG. 8, there are two hydraulic cylinders 320 driving the operating arm, and the hydraulic motor 350 for driving the rotor.

A single DC control distributor placed in the cab of the machine makes it possible to implement the operation of the unloading bucket by connecting, through a hydraulic block 400, the cylinders and the hydraulic motor with a pump P and / or a storage tank RS of the fluid of the hydraulic circuit of the machine E. The DC control valve is preferably of the type 4/3, closed center and manually controlled, as shown in this FIG. 8. The control valve could still be open center type. Π is connected to the hydraulic block 400 through two orifices DI and D2, via two pipes C1 and C2. The hydraulic motor 350 is connected to the hydraulic block 400 through two orifices 351 and 352, via two pipes C3 and C4, while the downstream and upstream chambers of the two hydraulic cylinders 320 are connected to the hydraulic block 400 through respectively two orifices 321 and 322, through two channels C5 and C6.

The orifices 321 and D2, the orifices 322 and DI are connected respectively through the hydraulic block 400 thus allowing the DC control distributor to supply, at the discretion of its control, the rods of the cylinders 320 in their two directions of movement. In the intermediate position of the DC control valve, called "closed center", visible in FIG. 11, any flow of the fluid is interrupted in the unloading bucket to allow its safe transport. The orifice 351 is connected to the orifice 321, and the orifice 352 is connected to the orifice 322 through the hydraulic block 400 thus realizing a parallel connection of the motor 350 with the cylinders 320. The hydraulic block 400 can incorporate other functionalities than that of the simple connection of the cylinders and the hydraulic motor with the control distributor and which are not detailed in this description.

Thus, the control distributor DC can supply, on the one hand, the cylinders 320 so that their rods move in one direction and, on the other hand, the hydraulic motor 350 so that it can rotate in one direction as the arrows F1 and Rt respectively in FIG. 9, while feeding the cylinders 320 so that their rods move in the opposite direction, as indicated by the arrow -F1 in FIG. 10, the hydraulic motor 350 does not rotate.

In Figs. 9, 10, 11 and 12, the flow direction of the hydraulic fluid is symbolized by the arrows I.

In FIG. 8, a hydraulic distributor 420 is interposed on the supply lines C3 and C4 of the hydraulic motor 350 to select a direction of rotation or the opposite direction of rotation of said motor. This distributor is preferably type 4/2, spring return and / or electrically controlled. The hydraulic distributor control 420 is made by means of a delay control means 450 able to detect a differential pressure existing between the hydraulic fluid circulating in the pipes C1 and C2 and to transmit a signal shifted in time to the distributor 420. Thus, it acts as a timer to switch the dispenser 420 into one or other of its positions when a differential pressure is detected. The delayed control of the distributor 420 makes it possible, in the meantime, for the rotor to stop or at least to slow down considerably before a reversal of the direction of rotation of the hydraulic motor 350 is commanded.

The delay control means 450 is composed in this FIG. 8, a bi-directional hydraulic actuator 460 such as a double-acting hydraulic cylinder, a bistable electrical pulse relay 470 and its control pusher 472, and an electrical control 422 of the distributor 420.

The hydraulic cylinder 460 is connected, via two pipes 461 and 462 to respectively the two pipes C1 and C2. Thus, in one of the two operating positions of the control distributor DC, visible in FIG. 10, the rod of the hydraulic cylinder 460 exits, as shown by the arrow F3, and moves the pusher 472 of the relay 470. Indeed, the supply pressure of the cylinders 320 and the motor 350 prevailing in the pipe C2 is greater than the pressure in the return line C1 of the hydraulic fluid, forcing the cylinder rod 460 out. Relay 470 then changes state, i.e., if it were closed, as shown in FIG. 9, it becomes open, as shown in FIG. 12, and vice versa, and feeds or not the electrical control 422 of the distributor 420, which then switches to its other position forcing the hydraulic motor 350, when powered, to change direction of rotation. A new pulse of the hydraulic cylinder 460 on the pusher 472 causes, in the same manner, the change of state of the relay 470 and, consequently, the reversal of the direction of rotation of the hydraulic motor 350.

Note that the output of the cylinder rod 460 is also caused when the DC control valve is tilted to its so-called "closed center" position, visible in FIG. 11, the mass of the moving element of the operating arm suffices to generate, via the jacks 320, a pressure in the pipe C2 which is greater than that prevailing in the pipe Cl, which also causes the exit of the rod hydraulic cylinder 460, as shown by the arrow F3, which can then reverse the state of the impulse bistable electrical relay 470.

In the other operating position of the DC control valve, visible in FIG. 12, the rod of the hydraulic cylinder 460 returns to its retracted position.

It can still be seen in FIG. 9, the presence of a unidirectional flow restrictor 480 interposed on a pipe and here the hydraulic motor supply pipe C3 350 to reduce the flow in a direction of flow of the fluid through said engine and leave it normal in the other. This unidirectional flow restrictor comprises a nozzle connected in parallel on both sides of a non-return valve.

In FIG. 10, and as previously stated, the hydraulic motor 350 does not rotate, while the rods of the cylinders 320 move in the direction indicated by the arrow -Fl. The movement of the cylinders 320 corresponds to the use, the rise of the operating arm 300 in which it is not desired that the rotor can rotate. To avoid this rotation of the rotor, a non-return valve 360 is installed downstream of the distributor 420 on a supply line of the. distributor 420 and here the pipe C3 connected to the orifice 351 of the hydraulic block 400. Thus, when the cylinders 320 are fed in one direction, the hydraulic motor 350 rotates and when they are fed in their other direction, the hydraulic motor does not turn over.

Another check valve 370 is installed downstream of the distributor 420 between the two pipes C3 and C4 so that the hydraulic motor 350 can stop freely when it is no longer powered so as not to risk damaging the associated transmission to this engine. Thanks to this non-return valve, the fluid circulates in a loop in the engine during its stop phase thus forming a hydraulic free wheel.

The operation of the unloading bucket 100 of the invention is as follows. The unloading bucket is splinted to a machine E provided with a lifting arm and is connected with the hydraulic and electrical circuit of the machine. The bucket is brought facing the cutting edge of a silo after raising the operating arm 300 to its disengaged position. The operator actuates the control valve so that the rotor 340 can be rotated in the direction indicated by the arrow Rt in FIG. 5 and that the maneuvering arm 300 initiates a descent movement towards its folding position, as shown by the arrow Ds. In this direction of rotation Rt-, the rotor 340 projects down the material that it has extracted from the silo. There is no more projection of material from above. The hydraulic fluid supplies the hydraulic motor through the unidirectional flow restrictor 480, see FIG. In this regard, the rotor rotates at a reduced speed. During this phase, the operator was able to cleanly top the silo and start filling the bucket. To fill it correctly and at an optimum speed, the operator briefly actuates the DC control valve, either in its "closed center" position or in its other passing position, as shown in FIG. 10. The cylinder rod 460 then exits and actuates the pusher 472 impulse bistable electrical relay 470 which tilts the distributor 420 in its other position.

At the resumption of work, that is to say when the operator controls the descent of the arm by actuating the DC control valve, the hydraulic motor 350 rotates in the opposite direction, as shown in FIG. 12 and at its normal speed. The direction of rotation of the rotor 340 is indicated by the arrow Rt + in this FIG. 12.

In FIG. 6, the extracted material is projected upwards, towards the deflector 308 which projects it, by ricochet in the bottom of the bucket 200 which can then be completely filled. The presence of the deflector also prevents product from being propelled by the top thus avoiding dirtying the tarpaulin.

In the folding position of the arm visible in FIG. 7, the operator chooses, if necessary, to continue filling the bucket 200, or to drive the machine with its bucket loaded to its place of discharge or emptying.

When the operator chooses to raise the operating arm 300, the hydraulic motor 350 is no longer powered and stops itself.

In use, the reversal of the direction of rotation of the hydraulic motor 350 is most often performed when the control distributor DC is in the "closed center" position because of the button operation of this distributor, so that this inversion meaning does not generate jerks, thus preserving the life of the hydraulic motor. A faster reversal of the direction of rotation of the hydraulic motor 350, however, is obtained by briefly raising the maneuvering arm 300.

In addition, the position of the operating arm and cylinders could be reversed, so that the rods of the jacks pull the arm to move it from its release position to its folding position.

The unloading bucket of the invention allows the operator who uses it to reverse the direction of rotation of the hydraulic rotor drive motor by a simple pulse on the control valve De placed in the control gear of the bucket. By alternately selecting the correct direction of rotation, he manages to fill the bucket completely without throwing material over the silo.

The reversal of the direction of rotation of the hydraulic motor is smoothly performed.

In an alternative embodiment of the hydraulic distributor 420, it comprises a light indicator capable of indicating the direction of rotation of the motor.

The invention is not limited to a dewatering bucket but relates to any machine of the type comprising at least one hydraulic motor capable of driving an accessory, and which it is desired to be able to simply reverse the direction of rotation. Such an engine is connected to a hydraulic distributor to reverse the direction of rotation of said hydraulic motor. This hydraulic distributor is connected, for example, to a control valve for controlling the operation of one (or more) other engine (s) or hydraulic cylinder (s). The machine incorporates, again, a control means of said hydraulic distributor, the control means being able to capture a pressure difference existing in the fluid flowing in the two connection pipes of the control distributor to the other motors or hydraulic cylinders for supply the hydraulic distributor with a bistable control signal able to switch it to another state.

To illustrate this, the invention may take the form of a bucket for the fragmentation of its contents during emptying, in particular to ventilate a compost.

Such a bucket for defragmenting consists of a bucket, two rotors rotatably mounted between the two elements of a maneuver arm and which are hingedly attached to the bucket. This cup is described in detail in the patent application published under No. FR-A-2,875,246 filed in the name of the applicant.

Each rotor is rotated through a hydraulic motor.

At least one hydraulic cylinder allows to maneuver the arm between a position where the rotors clear the opening of the bucket and a position where they cover the opening of the bucket.

Another hydraulic cylinder is used to tilt the bucket between a transport position where its opening is disposed approximately in a horizontal plane and a drain position where it is disposed approximately in a vertical plane.

In the approach towards its emptying position, the operator then actuates a distributor for controlling the movement of the actuating cylinder of the arm to move the rotors towards their position of covering the opening and to supply the two drive motors with rotation of the two rotors, so that they are rotated, preferably in the same direction.

The work of the rotors thus allows to destructure, to aerate the contents of the bucket during its emptying.

To modify the work of the rotors, the operator actuates briefly the control valve, which inverts the rotational direction of the rotors, thus allowing, for example, to expel a foreign object such as a troublesome branch prisoner between the two rotors.

Other applications than compost treatment are still possible, such as crushing products for recycling, mixing various products.

Claims (13)

A machine of the type comprising at least one hydraulic motor (350) for rotatably driving an accessory, comprising a hydraulic distributor (420) provided for reversing the direction of rotation of said hydraulic motor (350), the hydraulic distributor (420) being interposed on the two supply lines (C3, C4) of said motor, a control means (450) of said hydraulic distributor (420), characterized in that the control means (450) is able to capture an existing pressure difference in the fluid flowing in two connection pipes (C1, C2) between a control distributor (DC) and at least one other motor or hydraulic cylinder, to supply the hydraulic distributor (420) with a bistable control signal. 2. Machine according to claim 1, characterized in that the control means (450) comprises a bidirectional hydraulic actuator (460) connected to the two connecting pipes (C1, C2), a switch and / or a pulsed bistable electrical relay (470) operably disposed by said actuator (460) for transmitting a bistable and delayed signal to the hydraulic distributor (420). 3. Machine according to claim 2, characterized in that Γ hydraulic actuator is a double-acting hydraulic cylinder (460). 4. Machine according to claim 1, 2 or 3, characterized in that the hydraulic distributor (420) is of the type 4/2 and electrically controlled. 5. Machine according to any one of the preceding claims, characterized in that the hydraulic distributor (420) is connected to the connection pipes (C1, C2) of the control valve (DC). 6. Machine according to any one of the preceding claims, characterized in that it is in the form of a dewatering bucket (100) or a bucket for destructuring its contents during emptying, comprising a bucket ( 200) for loading / unloading, an operating arm (300) holding at its free end said hydraulic motor (350) for rotating a rotor (340), the operating arm (300) being hingedly mounted between a disengagement position and a crimping position on the bucket (200), under the effect of a drive via at least one hydraulic cylinder (320). 7. Bucket (100) according to claim 6, characterized in that said hydraulic motor (350) and said hydraulic cylinder (320) are connected to a hydraulic block (400) to be connected to the control valve (DC). 8. bucket (100) according to claim 6 or 7, characterized in that a unidirectional flow restrictor (480) is interposed on a supply pipe (C3) of said hydraulic motor (350) to reduce the flow in one direction fluid flow through said hydraulic motor and leave it normal in the other. 9. Bucket (100) according to claim 6, 7 or 8, characterized in that the operating arm (300) carries a deflector (308) for returning to the bottom of the bucket (200) of the product extracted from a silo (S) by the rotor (340) in a direction of rotation of said hydraulic motor (350). 10. Bucket (100) according to any one of claims 6 to 9, characterized in that a non-return valve (360) is installed downstream of the distributor (420) on a supply pipe (C3, C4) of the dispenser (420). 11. Bucket (100) according to any one of the preceding claims 6 to 10, characterized in that a non-return valve (370) is installed downstream of the distributor (420) between the two supply lines (C3, C4) for said hydraulic motor (350) to stop freely when no longer supplied. 12. bucket for destructuring its contents during its emptying according to any one of claims 6 to 11, characterized in that it comprises two hydraulic motors respectively for rotating two rotors held by the operating arm. 13. Bucket according to claim 12, characterized in that it is in the form of a compost aerating bucket.