FR2472342A1 - - Google Patents

Abstract

THE INVENTION RELATES TO A SCARIFIER DEVICE. IT RELATES TO A DEVICE HAVING A LINKAGE 5 IN THE FORM OF A QUADRILATER CONTROLLED BY A START-UP DEVICE 16 IN THE FORM OF A HYDRAULIC CYLINDER PLACED BETWEEN A LOWER SWIVEL ARM 6 AND A MOBILE FRAME 2 FOR TOOL SUPPORT. A HYDRAULIC CIRCUIT ALLOWS THE OPERATOR TO CHOOSE DIFFERENT TOOL MOVEMENTS. APPLICATION TO EARTH MOVING EQUIPMENT USED FOR SCARIFICATION.

Description

The present invention relates to a scarifier or picker device

  intended to be mounted on an earthmoving machine, for example a tractor or other vehicle, for performing soil digging operations.

  A scarifier device or a comedian

  essentially carries a linkage having a fixed frame mounted on the vehicle, a movable frame or tool support to which a tool is attached, and one or more arms which provide the articulated mounting of the frame carrying the tool on the fixed frame. An example scarifier device allows the tool to perform one or more geometric movements as described below. A first movement, considered radial,

  includes moving one or more points of

  til following a substantially circular path around a suitable horizontal axis of rotation through

  a point of the fixed frame. Thanks to this movement, the

  The working part of the tool can penetrate the ground and

  can follow a trajectory with practically

  me from an arc. A second movement, called

  The angle of incidence riation comprises the rotation of the mobile frame about an axis passing through the mobile frame itself and perpendicular to the plane in which

  the radial movement takes place. This movement modifies the

  angle of incidence of the working part of the tool and

  of the ground. Finally, a third movement, called

  parallelogram, includes the movement of the tool support frame and consequently the tool

  so that the angle of incidence of the part of

  tool and soil remains virtually unchanged.

  Thanks to this last movement, the tool tends to penetrate

  in the soil along a curved path whose curvature

  depends on the size of the different organs of the

  linkage. When these bodies form a parallelogram

  true, the angle of incidence remains constant.

  Known scarifying devices can

  be distinguished from each other according to the structure

  the mounting frame of the movable frame on the fixed frame, and the configuration of the control device, usually hydraulic, which ensures the movement of the linkage. In the known devices, the three aforementioned types of movement can not be implemented precisely or,

  in another form, these movements are not entirely

  They are independent of each other because the structure of the linkage or the type of control used is opposed to it. Finally, some devices require

  relatively complex structures for the implementation

  necessary movement. We already know different linkages for scarifying devices and different devices for controlling the movement of the linkage, including hydraulic devices. United States Patents 3,503,456, 3,527,308,

  3,973,632 and 4,031,964 represent various types of trin-

  glories and hydraulic devices that control

movement.

  The invention relates to a scarification device

  intended for earth-moving machinery or other

  hicle, comprising a linkage in the form of a

  articulated drilatère. A first pair of opposite sides of the quadrilateral is delimited by a movable frame or tool support and a fixed frame which provides the

  rigid mounting of the device on the machine or machine.

  The other opposite sides of the quadrilateral are formed by lower and upper pivoting arms, each articulated on the fixed and movable frame. The linkage is controlled by an actuator that is hinged between the lower pivot arm and the movable or tool support frame. This upper pivoting arm may advantageously comprise a second actuation device, controlled by a fluid and articulated between

  the fixed and mobile chassis. The Hybrid Control System

  hydraulics allows the linkage to perform a radial movement, allows a variation of the angle of incidence of the tool with the ground and allows further movement

in parallelogram.

  The invention therefore relates to a scari-

  driver or picker to be mounted on a trac-

  or another similar vehicle.

  It also relates to a device picheur

  having a parallelogram linkage.

  It also relates to a device that picks

  allows a radial movement, a parallel movement

  gram and a variation of the angle of incidence of the scarifier tool. Other features and benefits of

  the invention will emerge more clearly from the description which will

  follow, with reference to the accompanying drawings in which: - Figure 1 is a side elevation of an embodiment of the invention wherein the scarifying tool is shown in the lowered position in the ground; - Figure 2 is a side elevation of a second embodiment of the device according to the invention wherein the upper pivot arm of the linkage comprises a hydraulic actuation device; FIG. 3 is an end view of the scarifying device of FIG. 2;

  FIG. 4 is a diagram of the hydraulic circuit

  1 used to control the embodiment of the invention shown in FIG. 1; and FIGS. 5 to 7 are diagrams of hydraulic circuits used to control the embodiment

shown in Figure 2.

  Reference is first made to FIG. 1 which represents a scarifier device, generally referred to as 1, which comprises a movable support frame 2, to which one or more tools 3 are attached, and a fixed frame 4 intended to be mounted on a machine or machine (normally at the rear of it). A linkage 5 connects the mobile frame to the fixed frame 4 so that the mobile frame can move relative to the fixed frame. The linkage comprises substantially at least one lower arm 6 which is articulated at a first end at a pivot point 7 on the fixed frame 4 and at the other end at a pivot point 8 on the movable frame 2. As indicated in Figures 1 and 2, the lower arm has two longitudinal members

  9 rigidly connected by a cross-member 10. The rod

  5 also has an upper arm 13, one of which

  The first end is articulated at a point 14 on the fixed frame 4, and the other end is articulated at a pivot point 15 on the movable frame 2. In the embodiment shown in FIG.

  upper 13 has a single rod placed conveniently

  in a vertical plane which is equidistant from the

longitudinal ganes 9.

  The assembly formed by the two arms 6 and 13 and the frames 2 and 4 therefore constitutes a linkage linkage parallelogram intended to cause the displacement of the frame 2 of tool support in a vertical plane, the tool retaining substantially the same angle affect

with the ground.

  As clearly indicated in FIG. 1, the distance between the points 7 and 8 of articulation of the lower arm is greater than the distance between

  between points 14 and 15 of articulation of the upper arm

  13. The use of the elements of this structure

  geometry and the proper selection of other di-

  mensions of the parallelogram elements allow the prior selection of any variation of the position

  angular angle y of the tool 3 relative to the ground.

  In the case of the embodiment shown, it is

  it is appropriate that the angle of incidence

  the tool varies between 40, from a first posi-

  where the tool 3 is at its maximum depth

  male, and 450, when the tool 3 is at ground level

  as shown in broken lines in FIG.

  The linkage 5 is controlled by an actuation device itself controlled by a fluid, for example hydraulic cylinders 16. Each of the cylinders has a tubular casing or cylinder articulated at a pivot point 17 on the arm 6, and a rod 18 which can slide in the case and which is articulated in

  a point 19 on the mobile chassis 2. Item 17 of

  and placed on a projected projecting portion

  passing vertically above the arm 6 and is disposed close to the point 7 of articulation of the arm 6 on the fixed frame. The position of point 17 with respect to point 7 is chosen so that the point

  17 is above item 7 as clearly indicated.

  Figure 1. The point of articulation is

  placed between the points 7 and 8 of articulation of the arm 9.

  The point of articulation is chosen so that it

  located above the point at which the arm 13 is

  2. Each of the hinge points 19 is formed on a lug or a support 21, fixed rigidly to the frame 2, so that the convenience

  of operation of the whole is increased.

  In the embodiment shown, the lower arm 6 comprises a buffer element or support 22 intended to bear against a stop or a seat

  23 of the fixed frame 8 when the chassis

  bile 2 moves to its upper limit

  shown in broken lines in FIG.

  Figure 4 schematically shows the cir-

  controlled hydraulic control of the device described. The

  circuit includes a central hydraulic unit not re-

  presented for transmitting fluid under pres-

  ducted or piped 25, to the cylinders

  16, and to evacuate the fluid through a pipe or pipe-

  A distributor 28 is mounted between the conduits 25, 26 and the cylinders 16 and is connected by pipe portions or pipes 29 and 30 to the chambers 40, 41 adjacent to the head and adjacent to the stem. of each of the cylinders. The dispenser 28 can take at least two different positions, each of which modifies the fluid circulation conditions between the different ducts 25, 26 and 29, as described.

in the following.

  As clearly shown in Figure 2, the arm 13 of the linkage connecting the movable frame 2 to the fixed frame 4 can be replaced by a second hydraulic cylinder 32. A first end of the housing or the cylinder of this cylinder is articulated to a point 14 on the fixed frame 4 and a first end of the rod 33 of the piston is articulated at a point 15 on the movable frame 2. As a result, the hydraulic cylinder 32 (which is articulated to the points of articulation of the upper arm 13 on the frame 2 and 4) equates geometrically to

arm 13.

  In the embodiment of FIG. 2, the first and the second hydraulic cylinders 16 and 32

  may be ordered by one or other of two cir-

  hydraulic cookers shown in Figures 5 and 7.

  In Figure 5, the two cylinders 16 are controlled by a distributor 28 quite similar to the one we have

  described with reference to FIG. 4. The jack 32 is

  mandated by a second distributor 34 mounted between the first

  first distributor and the parts 35 and 36 of piping which are respectively connected to the chamber 39 adjacent to the rod and to the chamber 38 adjacent to the cylinder head

  32. The dispenser 34 can take practically two

  shown in Figures 5 and 6 respectively.

  in order to determine two different conditions of

  operation described below.

  The hydraulic circuit of FIG. 7 corresponds exactly to that of FIG. 5, but the distributor 34 is replaced by a distributor 37 which can take three

  different operating positions.

  We now consider the operation of the device according to the invention. We first consider the

  embodiment of Figure 1, from the

  lower limit of the linkage 5, the tool 3 then being at its maximum depth in the ground as

  shown in Figure 1. When the tool has to be

  raised, the distributor 28 (FIG. 4) is controlled by shifting to the right in this FIG. 4 so that it hydraulically connects the pipe portion 25 and the portion 29, so that fluid under pressure

  penetrates the chambers 40 of the cylinders 16. Simultaneously

  piping 26 is connected to the pipe 30 if

  although the fluid of the chambers 41 of the cylinders 16 may

  in this way, the rod 18 of each of the cylinders 16 moves to the right in FIG. 1 and rotates the pivoting arms 6 and 13 in the counter-clockwise direction so that the mobile frame 2 is raised The limit position reached at the end of this movement is shown in broken lines. In a very similar manner, the cylinders 16 can be controlled using the distributor 28 so that they

lower the chassis 2.

  Thus, the scarifier device according to

  vention performs a parallelogram motion in which the tool 3 moves vertically while its

  angle of incidence with the ground remains almost constant.

  It appears that the proper selection of the dimensions of the various elements forming the articulated parallelogram which regulates the movement of the tool allows

  obtaining any desired variation in the angle of in-

  the presence of the tool along its path. We consider

  in this respect, that its dimensions should be chosen

  so that the angle of incidence y varies between 40 and when it passes from its maximum driving position in the ground to the position of contact with the

ground surface.

  In the embodiment of FIG.

247234X

  can get two different modes of operation in addition to the one that ensures parallelogram movement

  described with reference to the embodiment of FIG.

  A first mode again includes the movement of the tool following the parallelogram movement, but with a predetermined angle of incidence y for the tool

  chosen by the operator according to the work, to be

  kill and which is maintained unchanged during the movement

  parallelogram. A predetermined angle of inci-

  The dence of the tool is first fixed by control of the distributor 34, moved from the configuration shown in Figure 5 to that of Figure 6. As shown in the latter figure, electrical connections are provided through the distributor 34 is between parts 29 and 35, 29 'and 36 and 30' and 30 of conduit. In this way, the hydraulic cylinder 32 is connected in series with the two hydraulic cylinders 16. The distributor 28 is then controlled by displacement towards

  the right in Figure 6 so that it connects hydraulic-

  ducts 25 and 29 'on the one hand and 26 and 30' on the other hand. The pressurized fluid reaches the head chamber 38 of the jack 32 and escapes from the chamber 39 of the rod towards the head chambers 40 of the cylinders 16. The fluid coming from the chambers 41 of the rod of the cylinders 16 is

  then directed to the tank 27.

  The distributor 34 is then brought back into the

  position of Figure 5 in which no food

  fluid flow to the head chamber 38 and no

  fluid cuation of the chamber 39 of the cylinder rod 32 are not possible. As a result, the jack 32 acts as a rigid arm of predetermined length. In addition, the control of the distributor 28 in the manner described above with reference to the first embodiment allows the setting of the hydraulic cylinders 16

  in any desired predetermined position.

  A second mode of operation comprises the parallelogram movement with simultaneous pivoting of the frame 2 about the axis of the hinge 8. The distributor 34 is moved to the position of Figure 6 and remains in this position. Given

  that the cylinders 32 and 16 are mounted in seies, the com-

  30 of the distributor 28 by displacement to the left then causes the pivoting of the tool 3 around the

  point 8 of articulation, when entering the ground.

  This particular mode of operation can be useful

in special circumstances.

  A third mode of operation of the

  FIG. 2 can be obtained by using the hydraulic circuit of FIG. 7. It should be noted that when the distributor 37 is moved to the position shown in this figure and when the distributor

  28 is shifted to the left in Figure 7, the parts

  29 'and 30' of ducts are connected to the parts and 36 respectively so that pressurized fluid reaches the chamber 39 placed on the side of the rod 32 of the cylinder, the fluid being removed from the chamber 38 placed on the side of the cylinder head 32. The parts

  29 and 30 piping, for this configuration, res-

  are then closed and prevent any transmission of

  fluid to chambers 40 and 41 or from chambers

  40 and 41 of the cylinders 16. In this way, the assembly

  comprising the lower arm 6, the chassis 2 and the

  16 act as a rigid structure and pivot around the point 7, under the control of the hydraulic cylinder 32. In this way, one obtains an operation with radial movement, that is to say in which the tip of the tool 3 follows a circular path around the

point 7 of articulation.

  It is understood that the invention has been described and shown only as a preferred example and that we can bring any technical equivalence in its constituent elements without exiting

of its frame.

247Z342

Claims (12)

  1. Scarifier device for terrace gear-   of the type which comprises a linkage (5) in the form of an articulated quadrilateral, having a movable frame (2) on which a scarifier tool is fixed, a frame   (4) mounted on the machine and two pivoting arms sensi-   parallel (6, 13) upper and lower,   each at a point on the fixed frame and in   a point on the movable frame, said scarifi-   characterized in that   the linkage (5) is controlled by a device   actuator (16) which is itself controlled by a fluid, and comprises joints (17, 19) connecting the actuating device to the lower pivoting arm and to the mobile chassis.   2. Scarifying device according to claim 1, characterized in that the actuating device (16) comprises a hydraulic cylinder having a rod attached to a piston and a housing, and the hinge (19) ensures the connection of the rod piston to the movable frame (2) and the hinge (17) connects the housing of the   cylinder at the lower pivoting arm (6).   3. scarifying device according to claim 1, characterized in that the articulation (17) of the lower pivoting arm (6) on the actuating device is placed between the points (7, 8) of articulation of the lower pivoting arm on the fixed and mobile chassis (2, 4)   and above the point of articulation of the pivoting arm on the fixed frame.   4. Scarifying device according to claim 3, characterized in that the articulation (19) of the device (16) for actuation on the movable frame (2) is placed above the point of articulation of the pivoting arm.   upper (13) on the mobile frame (2).   Scarifying device according to claim 4, characterized in that the distance between the articulation points of the lower pivoting arm (6) on the fixed and movable chassis (2, 4) is greater than the distance between the dots. articulation of   upper swivel arm (13) on these fixed and   bile. 6. scarifying device according to claim 1, characterized in that the movable frame (2) has a scarifying tool (3) which is fixed on it, the tool being movable between a first position in which it has   maximum depth in the soil and a second   where the tool is at an angle of incidence of approximately 5 between the first and the the second position.   Scarifying device according to Claim 1, characterized in that the upper pivoting arm (13) comprises a second actuating device (32). controlled by a fluid.   8. Scarifying device according to claim 7, characterized in that the second actuating device (32) comprises a hydraulic cylinder having a rod   piston and a casing, the piston rod being articu-   on the mobile frame (2) and the housing on the chassis fixed (4).   Scarifying device according to claim 1,   characterized in that the lower pivoting arm (6) comprises   takes at least two longitudinal members connected rigidly   to each other and the activation device   (16) is placed between the two members and the movable frame.   Scarifying device according to claim 9,   characterized in that the second setting device   tion (32) is placed between the longitudinal members.   11. Hydraulic control circuit of a scarifier device attached to an earth-moving machine, of the type which comprises a linkage having a movable frame on which a working tool is fixed, a fixed frame and upper and lower pivoting arms, a first device of   actuated by a fluid and placed between the   sis and the lower swivel arm, the first one   Positive activation with two chambers intended for   receiving and evacuating fluid, the upper swivel arm   apparatus comprising a second fluid controlled actuator having two chambers for receiving and discharging fluid, said hydraulic circuit being characterized by comprising a first distributor (34) having a first position in which fluid is transmitted to one of the chambers of the second actuator (32) and is evacuated from the other of the chambers so that the length of the upper swivel arm can be selectively adjusted, the first manifold (34) having a second position in which the hydraulic fluid can not be transmitted to the chambers of the second actuator (32) or removed from these chambers so that the upper pivoting arm maintains its predetermined length,   a second distributor (28) for transmitting   put hydraulic fluid through the first   first distributor (34) to one of the chambers of the first actuator (16) and to evacuate fluid from the other of the chambers of the first actuator so that the height of the scarifier device is adjusted during a parallelogram motion during which the distance between the points   articulation of each of the pivoting arms remains   aunt and the angle of incidence of the tool relative to the ground has a substantially predetermined value which depends   the predetermined length of the second half device   in action controlled by a fluid, and the first distributor (34), when in   its first position, transmits fluid evacuated by the se-   the actuating device (32) to one of the chambers   of the first actuating device while the fluid is simultaneously evacuated from the other of the chambers   the first device of action so that the   The angle of impact of the tool relative to the ground varies during   moving the first actuator.   Scarifying device according to Claim 11, characterized in that the first distributor (37)   has a third position in which the hydraulic fluid   lique is transmitted to one of the chambers of the second   activation device (32) and is evacuated from the other chamber, and in which the hydraulic fluid can not be transmitted to the chambers of the first   activation (16) or evacuated from these chambers.