Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
  • E02F3/402—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with means for facilitating the loading thereof, e.g. conveyors
  • E02F3/404—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with means for facilitating the loading thereof, e.g. conveyors comprising two parts movable relative to each other, e.g. for gripping
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
  • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
  • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like

Definitions

• the present invention relates to a system for controlling the synchronization of the movements of the different parts of a tool carried by a loader, in particular a front loader.
• a front loader fitted to a tractor has a tool-carrying frame at its free end on which various tools can be locked.
• some combine a claw with a material handling device, such as a bucket.
• the opening or closing of the claw and the modification of the orientation of the bucket, that is to say its dumping or lifting cannot be carried out that successively and independently.
• the fact that the movements of the different parts of a tool cannot be carried out simultaneously makes the operator waste time on work cycles which can be quite short.
• the object of the invention is to solve these problems.
• the invention relates to a system for controlling the synchronization of the movements of a claw and of a handling member such as a bucket, this claw and this handling member constituting a tool carried by a loader, the orientation of the handling member being activated by first control means, the opening and closing of the claw being controlled by second control means.
• said control system comprises means for synchronizing the operation of said first and second control means, so that on the one hand the movements of opening of the claw and tipping of the handling member are are carried out simultaneously and that, on the other hand, the movements for closing the claw and lifting the handling member are also carried out simultaneously. Thanks to this arrangement, the movements of the two parts of the tool can be synchronized, that is to say performed at the same time.
• the first control means are a double-acting hydraulic cylinder, called “tipping”
• the second control means are a cylinder double-acting hydraulic, called “claw”
• the two jacks are mounted in series on a hydraulic supply circuit, via a solenoid valve, so that when the solenoid valve is in the so-called “synchronization” position, the so-called chamber “claw opening” of the claw cylinder is in communication with hydraulic fluid with the so-called "lifting" chamber of the tipping cylinder
• the solenoid valve can occupy two other positions, a so-called “neutral” position in which only the tipping cylinder is supplied with hydraulic liquid to allow only the movements of the handling member and a so-called “claw manipulation” position in which only the claw jack is supplied with hydraulic fluid to allow only the movements of said claw
• said solenoid valve is electrically controlled by means of two separate push-buttons, the first called “synchronization” allowing the passage of said solenoid valve
• FIG. 1 is a general diagram showing a control system according to the state of the art of a loader mounted on an agricultural tractor, this control system being in a position such that only the orientation of the bucket can be modified
• - Figure 2 is a diagram similar to that of Figure 1, the control system being in a position allowing only the movement of the claw
• - Figures 3, 4 and 5 are diagrams similar to that of Figure 1 but showing the control system according to the invention and which show different operating positions of this system, respectively a position in which the operation of the bucket and the claw are synchronized (Figure 3), a position in which only the movements of the bucket are authorized (figure 4) and a position in which only the movements of the claw are authorized (figure 5).
• the reference T denotes an agricultural tractor equipped with a front loader C comprising, in the usual manner, an articulated stretcher B provided at its front end with a tool-carrying frame CP.
• the loader has a pair of lifting cylinders VL (only one of which is visible in the front views corresponding to the figures), which allow the stretcher B to pivot around its axis of articulation X, so as to cause the lifting or lowering the tool O carried by the frame CP.
• the tool O comprises a handling member 2 associated with a claw 3.
• this handling member 2 is a bucket, that is to say a hollow tool or bucket.
• the tool O can also be a silage tool in which the handling member 2 is a vertical flat frame provided at its base with a series of teeth or a fork manure in which the handling member 2 is also a bucket but very little concave also provided with teeth.
• the member 2 was a bucket.
• the loader C also includes a pair of tipping cylinders 1 (only one of which is visible in the figures which are front views), with double effect allowing the tool O to pivot relative to the stretcher B and around a axis Xi.
• the jacks 1 constitute means for controlling the orientation of the bucket 2.
• This jack 1 comprises a piston 10 secured to the tool holder frame CP and a cylinder 11 secured to the stretcher B.
• This jack 1 also has a small chamber 110 (on the side of the piston rod 10) and a large opposite chamber 111.
• the tractor T is equipped with low and high pressure hydraulic sources, respectively BP (atmospheric pressure) and HP (pressure of the order 1.5.10 7 to 2.10 7 Pa).
• Line 8 corresponds to the supply of high pressure liquid and line 9 to return to the tank (low pressure line).
• the conduits 8 and 9 are connected, via a control valve 5 with three positions and an electrovalve EV, on the one hand to the small chamber 110 of the tipping cylinder 1 and on the other hand to its large chamber 111.
• the connections between the control valve 5 and the solenoid valve EV are referenced respectively 81 and 82 and the connections between the solenoid valve EV and the chambers 111 and 110 are referenced respectively 83 and 84.
• the small chamber 110 will be conventionally called “lifting chamber”, because the supply of pressurized liquid in this chamber causes the bucket 2 to be raised.
• the claw 3 is equipped with a pair of jacks 4, hereinafter called “claw jacks" (only one of which is visible in the figures in front view). These jacks constitute means for controlling the opening and closing of the claw 3.
• This double-acting jack 4 comprises a piston 40 integral with the claw
• the jack 4 also has a small chamber 410 on the piston side and a large chamber 411 on the opposite side.
• the conduits 8 and 9 are connected to the claw jack 4, via the control valve 5 and the EV solenoid valve.
• the connections between the EV solenoid valve and the chambers 410 and 411 are respectively referenced 86 and 85.
• the control valve 5 being in the reverse position 52 - the EV solenoid valve being always in the same position - it is possible to bring the liquid into the large chamber 411 of the jack 4 and thus to close the claw 3.
• the small chamber 410 will be conventionally called “claw opening chamber", because the supply of pressurized liquid in this chamber causes the claw to open 3.
• the solenoid valve EV is controlled by a electric switch 700, itself actuated by a push button 70, called “claw activation”.
• the large-scale detail which appears in a circle at the top left of the figures represents a part of the control handle 7 which is provided with the tractor. This handle 7 makes it possible to actuate the control distributor 5.
• the push button 70 is mounted on the handle 7.
• FIG. 3 illustrates the control system according to the invention which makes it possible to solve this problem.
• the tipping cylinder 4 and the claw cylinder 1 are mounted in series on the hydraulic supply circuit, via a three-position solenoid valve 6 which replaces the prior art EV solenoid valve.
• the solenoid valve 6 can be placed in the two so-called positions
• the solenoid valve 6 can also be brought into a third position called “synchronization" referenced 63 and illustrated in Figure 3, in which the claw cylinder 4 and the cylinder tipping 1 are mounted in series on the hydraulic supply circuit. More specifically, the claw opening chamber 410 of the claw cylinder 4 is in communication with hydraulic fluid with the lifting chamber 110 of the cylinder 1, via the solenoid valve 6.
• the solenoid valve 6 is in this synchronization position 63 and that the control distributor 5 is in the active position 51, the hydraulic fluid under pressure is brought into the large chamber 111 of the jack 1.
• the liquid present in the lifting chamber 110 is expelled in the direction of the solenoid valve 6 then is returned via the line 86 to the opening chamber of the claw 410 of the jack 4, before returning to the low pressure tank.
• the opening of the claw 3 is synchronized with the tipping or dumping of the bucket 2.
• the movement of the control valve 5 in the reverse position 52 causes the reverse circulation of the hydraulic fluid and the synchronization of the closing of the claw 3 with the lifting of the bucket 2.
• the solenoid valve 6 is controlled by an electric switch 700 called "claw actuation", in accordance with what has been described previously for the EV solenoid valve and which makes it possible to bring the solenoid valve 6 from neutral position 61 to position 62 of claw handling.
• the solenoid valve 6 is also controlled by a second electrical switch 710 called "synchronization", itself actuated by a push button 71 carried by the control handle 7.
• the synchronization switch 710 makes it possible to bring the solenoid valve 6 from neutral position 61 to synchronization position 63.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Forklifts And Lifting Vehicles (AREA)
• Feeding Of Workpieces (AREA)
• Operation Control Of Excavators (AREA)
• Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
• Automatic Assembly (AREA)
• Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=34945413

Family Applications (1)

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• 2004
  • 2004-04-13 FR FR0403836A patent/FR2868794B1/fr not_active Expired - Fee Related
• 2005
  • 2005-04-12 DE DE602005017133T patent/DE602005017133D1/de active Active
  • 2005-04-12 AT AT05757165T patent/ATE445739T1/de not_active IP Right Cessation
  • 2005-04-12 NZ NZ551238A patent/NZ551238A/en not_active IP Right Cessation
  • 2005-04-12 WO PCT/FR2005/000877 patent/WO2005103394A1/fr active Application Filing
  • 2005-04-12 EP EP05757165A patent/EP1738033B1/de active Active

Non-Patent Citations (1)

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