CN105874929A - Rotary paddy field laser land leveller - Google Patents

Abstract

The invention relates to a rotary paddy field laser land leveller. The rotary paddy field laser land leveller comprises a suspension bracket, a levelling rotation frame, a synchronous movement rod, a synchronous movement frame and a levelling shovel blade. The levelling rotation frame is connected with the suspension bracket through a bearing block. The rotary paddy field laser land leveller is characterized in that the rotary paddy field laser land leveller further comprises two hinged bases, the lower ends of the hinged bases are fixed to the lower portion of the levelling shovel tool, and the upper ends of the hinged bases are hinged to the synchronous movement frame; the levelling rotation frame, the synchronous movement rod, the synchronous movement frame, the hinged bases, the levelling shovel blade and the levelling rotation frame are hinged in sequence to form a parallelogram mechanism, connection lines between hinge points of the upper end of the levelling shovel blade and hinge points of the hinged bases are on the same side of the parallelogram, and the synchronous movement frame and the levelling rotation frame are arranged vertically; the synchronous movement frame drives a laser receiver to ascend and descend synchronously. The rotary paddy field laser land leveller has the advantages that elevation synchronization of the rotary levelling shovel blade and the translational laser receiver is achieved, and accordingly, levelling accuracy is higher. The rotary paddy field laser land leveller belongs to the technical field of agricultural paddy field plowing machines.

Description

A kind of rotary type paddy field laser flatting machine

Technical field

The present invention relates to a kind of Agricultural Water paddy field tillage machine tool, particularly to a kind of rotary type paddy field laser flatting machine.

Background technology

Currently, in the agricultural irrigation of China, surface irrigation is occupied an leading position, and irrigation water using efficiency is relatively low, Also has bigger water saving potential.Precision land-levelling is the important prerequisite condition improving surface irrigation systematic function One of, it is one of important foundation measure improving Surface irrigation water quality.Laser land leveling system most important feature is Save agricultural water, agricultural water effect, water saving 30%～50% can be improved；Owing to the arable land after smooth is smooth Degree height, is conducive to improving crop irrigation emergence rate, improves the growing environment of crop, improve the yield of agricultural product, High-precision prepartion of land operation, crop yield can improve 20%～30%；After utilizing laser accurate smooth, Use chemical fertilizer and be all stored in crop root, be evenly distributed and do not have fertilizer loss and de-fertile phenomenon, subtracting Few environmental pollution, utilization rate of fertilizer improves 20%.

At present, China's paddy field laser flatting machine is generally by put down hinged with parallel rod end of hydraulic-driven Ground shovel vertically moves up and down, thus realizes the elevation regulation of land level scraper.Owing to land level scraper is heavier, on land level scraper The relative pressure difference risen and decline is relatively big, has a strong impact on the barycentre steadiness of land leveller and shovels elevation pacifically and automatically adjust Joint controls.Therefore, a kind of Novel rice paddy laser flatting machine is needed for paddy field laser flatting machine, to meet water The demand that the accurate laser in field is smooth.

CN103583101A discloses the land level scraper elevation governor motion of a kind of paddy field laser flatting machine, uses flat The elevation of land level scraper is adjusted by row quadrangular mechanism, using land level scraper as of parallel-crank mechanism Limit, it is easy to control and improve the smooth precision of paddy field laser flatting machine.But this structure has a disadvantage in that 1. land level scraper is to rotate and laser pickoff is translation, and the elevation of the change of the elevation of land level scraper and laser pickoff becomes Changing asynchronous, error is bigger.2. level land perching knife cannot fold, and width is relatively big, transport inconvenience.

Summary of the invention

For technical problem present in prior art, it is an object of the invention to: to existing rotary type level land Shovel elevation governor motion carries out structure optimization, it is provided that one makes the change of land level scraper knife up journey high with laser pickoff Cheng Bianhua near-synchronous, the rotary type paddy field laser flatting machine that leveling effect is the most accurate and level land is in hgher efficiency.

In order to achieve the above object, the present invention adopts the following technical scheme that

A kind of rotary type paddy field laser flatting machine, including hanger bracket, leveling rotating turret, the bar that is synchronized with the movement, with Step movement frame, level land perching knife；Leveling rotating turret is connected by bearing block with hanger bracket, it is characterised in that: it Also including two hinged seats, the bottom of the lower end of hinged seat and level land perching knife is fixed, upper end and the frame that is synchronized with the movement Hinged；Leveling rotating turret, the bar that is synchronized with the movement, the frame that is synchronized with the movement, hinged seat turn together with level land perching knife, leveling Moving frame the most hinged composition parallel-crank mechanism, and the hinge of the pin joint of the upper end of level land perching knife and hinged seat The line of contact is positioned on a limit of parallelogram, is synchronized with the movement frame and leveling rotating turret is vertically arranged； The frame that is synchronized with the movement drives laser pickoff synchronization lifting.

The pin joint of leveling rotating turret perching knife pacifically is O, and taking O point is Y-axis positive direction straight up, Being perpendicular to Y-axis and pointing to hanger bracket from the frame that is synchronized with the movement is Z axis positive direction, and the fabric width direction of level land perching knife is X Direction of principal axis, sets up XYZ rectangular coordinate system；In YZ plane, the pin joint of be synchronized with the movement frame and hinged seat For A, the lower shovel face minimum point of level land perching knife is the intersection point C that B, A are perpendicular to shovel face, crosses O point and parallel Hand in shovel face the intersection point of bottom surface of land level scraper be D, β be the angle of OD and Y-axis negative direction, satisfiedAfter optimization Δ T=Tmax-Tmin≤9.5mm, makes the change of land level scraper knife up journey and laser pickoff elevation near-synchronous.Herein Described near-synchronous, refers to the vertical error in working region the least, up to 4.75%.

The frame that is synchronized with the movement is inverted U-shaped；The quantity of hinged seat is two, respectively inverted U-shaped with the frame that is synchronized with the movement Lower end connect.

Level land perching knife include a main perching knife, about two secondary perching knives, two drive about secondary perching knife relative to The folding driving device of main perching knife collapsed forward；The main perching knife being connected with hinged seat is positioned at centre, about two Secondary perching knife lays respectively at the left and right sides of main perching knife, and left and right pair perching knife is connected with main perching knife rotary type.

The fabric width taking main perching knife is X ' axle, and shovel face is X ' Y ' plane, and the front pointing to main perching knife from X ' Y ' plane is The positive direction of Z ' axle, sets up X ' Y ' Z ' rectangular coordinate system；The rotary shaft that the secondary perching knife in left and right rotates relative to main perching knife Line is that L, L are parallel to Y ' Z ' plane, and the angle of the projection that L is on Y ' Z ' and Y ' axle is α, 6 °≤α≤10 °； The secondary perching knife in left and right folds relative to main perching knife forward upward.

Folding driving device is Foldable hydraulic oil cylinder, corresponding about an one secondary perching knife of Foldable hydraulic oil cylinder； One end of Foldable hydraulic oil cylinder is hinged with main perching knife, and the other end is hinged with left and right pair perching knife；Foldable hydraulic oil cylinder Being reduced to the most in short-term, main perching knife is generally aligned in the same plane with left and right pair perching knife；During the elongation of Foldable hydraulic oil cylinder, left and right Secondary perching knife folds to the front of main perching knife, reduces shovel width.

The back side of main perching knife and left and right pair perching knife is equipped with hinged ear, passes through between main perching knife and left and right pair perching knife Hinged ear connects, and main perching knife and Foldable hydraulic oil cylinder are connected by hinged ear, left and right pair perching knife and Foldable hydraulic Oil cylinder is connected by hinged ear.

Hanger bracket is provided with the leveling rotating spindle extended along fore-and-aft direction, equipped with bearing on leveling rotating turret Seat and bearing, by leveling rotating spindle and the cooperation of bearing, leveling rotating turret rotates around leveling rotating spindle； Being also equipped with leveling hydraulic jack on hanger bracket, the telescopic end of leveling hydraulic jack is hinged with leveling rotating turret, When leveling hydraulic jack stretches, leveling rotating turret swings relative to hanger bracket.

A kind of rotary type paddy field laser flatting machine, also includes receptor mounting rod and receptor raise-lower hydraulic oil cylinder； Laser pickoff is fixed on the upper end of the receptor mounting rod being vertically arranged, and is arranged on connecing of being synchronized with the movement on frame Receive the lifting of device raise-lower hydraulic hydraulic oil cylinder driving receptor mounting rod, regulate the phase of laser pickoff and laser plane To position.

Generally speaking, present invention have the advantage that

1. land level scraper elevation governor motion (CN103583101A) of pair existing a kind of paddy field laser flatting machine It is optimized, by arranging hinged seat, the rear end of level land perching knife is declined so that level land perching knife is as parallel One ingredient of quadrangular mechanism is not the most positioned on a limit of parallelogram, thus makes level land perching knife Elevation change with laser pickoff elevation change close proximity to.When it meets specific formulation so that land level scraper The depth displacement of cutter and laser pickoff is minimum, it is achieved the level land perching knife of rotary type and the laser pickoff of translational Being synchronized with the movement of elevation, level land precision is higher.

2. use folding land level scraper knife structure, reduce the purpose that fabric width reaches conveniently to transport.

3. about, secondary perching knife uses the tilting folding mode of forward upward, and during collapsed forward 90 degree, left and right is secondary The point of a knife of perching knife is lifted up, and adds this point of a knife distance to ground, makes point of a knife be more than to the distance on ground Main perching knife, to the distance on ground, protects point of a knife, to reach conveniently to pass in and out paddy field, the purpose of tractor road walking.

4. carrying out hinged fixing by being arranged on the hinged ear at the back side, the hinged ear of upper end is longer, and lower end Hinged ear is shorter, the most i.e. structure can realize the tilting structure of pivot center L easily.

5. use the structure that leveling rotating spindle, bearing, bearing block, leveling hydraulic jack coordinate, and by inclining Angle transducer is exchanged the inclination angle of flat turn moving frame and is measured, and adjusts the position of leveling rotating turret in real time, is allowed to begin It is maintained at horizontal level eventually.

6. the lifting of laser pickoff, convenient regulation laser pick-off is automatically controlled by receptor raise-lower hydraulic oil cylinder The relative altitude of the laser plane that device and generating laser are set up, it is achieved land leveller operator are on seat Can arrange and regulate, save the time, improve working performance.

Accompanying drawing explanation

Fig. 1 is the side view of the present invention.

Fig. 2 is the axonometric chart of the present invention.

Fig. 3 is the use state diagram of folding level land perching knife, and in this figure, angle is 0 degree, i.e. only with front The mode that side folds.

Fig. 4 is the schematic diagram of the oblique fold mode of level land perching knife.

Fig. 5 a is the explosive view of the oblique fold structure of level land perching knife.

Fig. 5 b is the installation diagram of Fig. 5 a.

Fig. 6 is the use state diagram of folding level land perching knife, and in this figure, angle is more than 0 degree, before i.e. using The mode folded over.

Fig. 7 is the schematic diagram of parallel-crank mechanism.

Wherein, in figure, 1 be hanger bracket, 2 be level land perching knife, 3 be leveling rotating turret, 4 for being synchronized with the movement Frame, 5 be the bar that is synchronized with the movement, 6 be main perching knife, 7 be left and right pair perching knife, 8 be Foldable hydraulic oil cylinder, 9 be height Journey cylinder bracket, 10 be bearing block, 11 be leveling rotating spindle, 12 be elevation hydraulic jack, 13 for connecing Receive device mounting rod, 14 be receptor raise-lower hydraulic oil cylinder, 15 for laser pickoff, 16 be generating laser, 17 it is leveling hydraulic jack, 18 be laser signal, 19 is trifilar suspension, 20 is hinged seat, 21 is dilatory Machine trailing wheel, 22 be hinged ear, 23 for putting forth effort swash plate.

Detailed description of the invention

Come that the present invention will be further described in detail below.

A kind of rotary type paddy field laser flatting machine, including level land perching knife, leveling rotating turret, the frame that is synchronized with the movement, Be synchronized with the movement bar and five parts of hanger bracket, also includes two hinged seats.Set the shovel being parallel to level land perching knife Width direction is X-axis, and vertical direction is Y-axis, and being perpendicular to X/Y plane and pointing to trifilar suspension direction is Z axis, sets up XYZ rectangular coordinate system.Setting the shovel width direction being parallel to level land perching knife as X ' axle, the shovel face of level land perching knife is Y ' axle, The direction being perpendicular to X ' Y ' plane sensing level land perching knife dead ahead is Z ' axle, sets up X ' Y ' Z ' rectangular coordinate system.

Level land perching knife includes a main perching knife, about two secondary perching knives and two Foldable hydraulic oil cylinders.Main perching knife Left side and right side all include the hinged ear hinged with left and right pair perching knife and hinged with Foldable hydraulic oil cylinder hinged Ear, hinged ear that left and right pair perching knife bag is hinged with main perching knife and the hinged ear hinged with Foldable hydraulic oil cylinder.Main The hinged ear of perching knife and the hinged ear hinged formation pivot center L, L of left and right pair perching knife be parallel to Y ' Z ' plane and The projection in Y ' Z ' face and the angle of Y ' are that α, i.e. L design for tilting.Hinged ear is positioned at main perching knife and left and right pair shovel The back side of cutter, in the one group of hinged ear constituting a pivot center, under the length of the hinged ear of upper end is more than The length of the hinged ear of end, therefore pivot center upper end is more than pivot center lower end to shovel face to the distance in shovel face Distance.The secondary perching knife in left and right is arranged in main perching knife lateral symmetry.

Under the effect of Foldable hydraulic oil cylinder, left and right pair perching knife folds relative to main perching knife forward upward.When During farm work, two Foldable hydraulic oil cylinders are reduced to the shortest, and left and right pair perching knife fully opens and is in same with main perching knife One plane.The secondary perching knife in left and right and main perching knife are respectively provided with and put forth effort swash plate, when left and right pair perching knife fully opens, and main shovel The swash plate of putting forth effort putting forth effort swash plate and left and right pair perching knife of cutter is fitted completely, plays effect that is spacing and that put forth effort, makes Two Foldable hydraulic oil cylinders do not stress when grading operation.When two Foldable hydraulic oil cylinders reach the longest, left and right is secondary Perching knife forward upward 90 ° folding.Main perching knife and the pivot center of left and right pair perching knife, folding ram and main perching knife Pivot center hands over the shovel face of level land perching knife to be α, and after making the 90 ° of foldings forward of the secondary perching knife in left and right, its bottom surface is relative to master Perching knife bottom surface is at an angle, when land leveller is lifted up by tractor three-point hitch, secondary about increase Perching knife point of a knife and ground distance.The secondary perching knife in left and right 90 ° of foldings and angle α forward realize level land perching knife and fold to reduce Fabric width, reaches conveniently to pass in and out the purposes such as paddy field, tractor road walking and transport.

The upper end of level land perching knife is hinged with the lower end of leveling rotating turret, and the axis of its hinged place is parallel with X-axis； Elevation cylinder bracket is positioned in the middle part of leveling rotating turret, and its one end is fixed with leveling rotating turret, the other end and elevation The upper end thereof of hydraulic jack, the lower end of elevation hydraulic jack is then hinged with the middle part of main perching knife；By height The telescopic drive level land perching knife of journey hydraulic jack rotates upwardly and downwardly around level land perching knife axis hinged with leveling rotating turret, Thus regulate the bottom surface of level land perching knife and the relative altitude in mud face, it is achieved the elevation regulation of paddy field laser flatting machine. Rotating around hinged axis and realize elevation regulation, not only the stress of elevation hydraulic jack is little, and elevation hydraulic pressure The response speed of oil cylinder faster, the linearity good, improve accuracy for vertical control, it is achieved precisely level land.

The frame that is synchronized with the movement is inverted U-shaped, vertical connecting rod lower end, left and right two and the upper end thereof of hinged seat, is synchronized with the movement One end of bar is hinged with the frame that is synchronized with the movement, and the other end is hinged with leveling rotating turret, so that leveling rotating turret, Level land perching knife together with hinged seat, be synchronized with the movement frame and the bar that is synchronized with the movement by the composition parallelogram that is hinged Mechanism.The frame that is synchronized with the movement during land level scraper swivel is dynamic remains vertical, and the elevation of level land perching knife becomes Change amount is identical with the elevation variable quantity of the frame that is synchronized with the movement, so that the elevation change of level land perching knife can pass through laser Receptor is measured and is accurately obtained.The upper end of hinged seat is hinged with the frame that is synchronized with the movement, and lower end is fixed with level land perching knife, Thus the lower end of level land perching knife is sunk, it is allowed to both become an ingredient of parallel-crank mechanism, again It is not positioned on a limit of parallelogram.The design of hinged seat need to meet following formula:

$T=Y_A-Y_B=-\sqrt{{(AC-BD)}^2+{(OD-BC)}^2}cos\[\mathrm{\β}+\arctan \left(\frac{AC-BD}{OD-BD}\right)\]+\sqrt{({\mathrm{OD}}^2+{\mathrm{DB}}^2)}cos(\mathrm{\β}-\arctan \frac{BD}{OD})$

Δ T=Tmax-Tmin, wherein, T is that the pin joint perching knife bottom surface pacifically of hinged seat is at the coordinate of Y direction Difference, Δ T is the depth displacement of the land level scraper knife up journey in land level scraper knife up journey slewing area and laser pickoff, high Path difference is equal to zero, and the elevation change making level land perching knife is identical with the elevation change of laser pickoff.

Receptor raise-lower hydraulic oil cylinder is fixed in the middle part of the cross bar of the frame that is synchronized with the movement, receptor mounting rod and reception Device raise-lower hydraulic oil cylinder is threaded connection fixing, and laser pickoff is installed in the upper end of receptor mounting rod.Connect Receive the relative of the device raise-lower hydraulic oil cylinder laser plane that conveniently regulation laser pickoff is set up with generating laser Highly, it is achieved land leveller operator arrange on seat and regulate, save the time, improve working performance.

Hanger bracket front end is provided with trifilar suspension, is connected with tractor three-point hitch.Hanger bracket rear end sets Being equipped with the leveling rotating spindle being parallel to Z axis, leveling rotating spindle is by bearing and bearing block and leveling rotating turret Connect.The parts such as hydraulic system and gearbox are placed at the middle part of hanger bracket.

Leveling rotating turret is connected with the leveling rotating spindle rotary type of hanger bracket rear end by bearing, and bearing block is solid Being scheduled in the middle part of leveling rotating turret, leveling hydraulic jack is arranged on hanger bracket, on the right side of lower end and leveling rotating turret Hinged, make leveling rotating turret remain level when operation by the flexible of leveling hydraulic jack, synchronize Movement frame and laser pickoff remain vertical.

Level land perching knife remains level when operation, measures tractor or hanger bracket by obliquity sensor Cross dip, keeps level, leveling hydraulic jack by controlling leveling hydraulic jack telescopic adjustment level land perching knife Elongation form closed loop control by displacement sensor.

Level land perching knife when passing in and out paddy field, transport, for reduce fabric width need about secondary perching knife collapsed forward, again by In time paddy field laser flatting machine complete machine being improved when tractor three-point hitch, paddy field laser flatting machine complete machine Turn forward α degree, and the distance overhead of the left and right pair perching knife perching knife point after folding is whole less than paddy field laser flatting machine The hoisting depth of machine, and reduce further along with the increase of left and right pair perching knife fabric width, the even secondary perching knife in left and right Point of a knife contact ground, cause pass in and out paddy field difficulty or cannot normally use, as shown in Figure 3.

As shown in Fig. 4, Fig. 5 a, Fig. 5 b, when elevation hydraulic jack reaches the longest, level land perching knife is in vertically Position, now for making the secondary perching knife in left and right fold with α degree forward, the most main perching knife and the rotary shaft of left and right pair perching knife Line becomes α degree angle with main perching knife vertical plane intersection direction, and during for ensureing that level land perching knife is opened, left and right pair perching knife shovels Face is coplanar with main perching knife shovel face, then when left and right pair perching knife shovel face is in same plane with main perching knife shovel face, main Perching knife pin joint axis, pair perching knife pin joint axis, left and right are parallel to each other and common in the projection of YOZ plane Line；For making the secondary perching knife in left and right can not interfere 90 ° of foldings forward, the now axis of the hinged ear of folding ram Line is parallel to YOZ plane and is α with the angle in shovel face, and when about Foldable hydraulic hydraulic oil cylinder driving, secondary perching knife is around hinged Point axis rotates after 90 °, left and right pair perching knife and main perching knife angle α, is i.e. α with Z axis positive direction angle；For About when making the secondary perching knife in left and right open, secondary perching knife sideline overlaps with main perching knife sideline, and left and right pair shovels hinged ear axis Line is equal to the distance in sideline to distance ear hinged with the main perching knife axis in shovel sideline；As shown in Figure 6, reach Both reduce the purpose that fabric width reaches conveniently to transport, make again complete machine be stowed time machine three-point hitch carries and fold After the parallel ground of pair perching knife, left and right or toward upwarping certain angle, increase secondary perching knife point of a knife and ground about land level scraper Identity distance from.

Field work: generating laser is horizontally mounted, and by rotating its laser signal launched, be sharp A datum plane set up by optical receiver, and this datum plane remains constant in the course of the work.Due to paddy field Mud foot soft or hard is different, is uneven, and when the tractor of mounting laser flatting machine is at field work, fuselage is agree Surely can be fluctuated or tilt.When fuselage uprises compared with initial plane, terminate under laser pickoff Receive laser signal, and be converted into the signal of telecommunication, control the elongation of elevation hydraulic jack and drive land level scraper to decline, make Level land perching knife and laser pickoff remain on original working face.When tilting, pass through leveling Hydraulic jack stretches, and regulation leveling rotating turret and level land perching knife remain at horizontal level.Because elevation liquid Compressing cylinder drives main perching knife to rotate, then is driven the frame entirety that is synchronized with the movement to keep vertical motion by hinged seat 0, Rotation around O point is converted into the translation of the frame in the vertical direction that is synchronized with the movement by main perching knife, inherently makes level land The change of perching knife elevation is inconsistent with the change of laser pickoff elevation, thus causes bigger level land error；Such as Fig. 7 Shown in, for making level land error diminish, hinged seat need to meet:

$T=Y_A-Y_B=-\sqrt{{(AC-BD)}^2+{(OD-BC)}^2}cos\[\mathrm{\β}+\arctan \left(\frac{AC-BD}{OD-BD}\right)\]+\sqrt{({\mathrm{OD}}^2+{\mathrm{DB}}^2)}cos(\mathrm{\β}-\arctan \frac{BD}{OD})$

Δ T=Tmax-Tmin, wherein, T is that hinged seat pin joint shovels the bottom surface coordinate difference in Y direction pacifically, Δ T is the depth displacement of the land level scraper knife up journey in land level scraper knife up journey slewing area and laser pickoff, depth displacement The change of land level scraper knife up journey can be made identical with laser pickoff elevation change equal to zero.And Δ T can only take in reality Ensure to be synchronized with the movement the stability of motion of frame and the optimal solution on the premise of getting rid of the interference between component, excellent After change, the pin joint of hinged seat makes the change of land level scraper knife up journey and receptor elevation change Delta T≤9.5mm, and whole Elevation regulation region is 400mm, and error is only 4.75%, negligible, so can be by land level scraper after You Huaing Knife up journey is considered as Complete Synchronization motion with the regulation motion of laser pickoff elevation.

Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-mentioned reality Execute the restriction of example, the change made under other any spirit without departing from the present invention and principle, modification, Substitute, combine, simplify, all should be the substitute mode of equivalence, within being included in protection scope of the present invention.

Claims (9)

1. a rotary type paddy field laser flatting machine, including hanger bracket, leveling rotating turret, the bar that is synchronized with the movement, synchronization Movement frame, level land perching knife；Leveling rotating turret is connected by bearing block with hanger bracket, it is characterised in that: it is also Including two hinged seats, the bottom of the lower end of hinged seat and level land perching knife is fixed, upper end and the frame hinge that is synchronized with the movement Connect；Leveling rotating turret, the bar that is synchronized with the movement, the frame that is synchronized with the movement, hinged seat rotate together with level land perching knife, leveling Frame the most hinged composition parallel-crank mechanism, and the pin joint of the upper end of level land perching knife and hinged seat is hinged The line of point is positioned on a limit of parallelogram, is synchronized with the movement frame and leveling rotating turret is vertically arranged；With Step movement frame drives laser pickoff synchronization lifting.

2. according to a kind of rotary type paddy field laser flatting machine described in claim 1, it is characterised in that: leveling rotates The pin joint of frame perching knife pacifically is O, takes O point straight up for Y-axis positive direction, be perpendicular to Y-axis from It is Z axis positive direction that the frame that is synchronized with the movement points to hanger bracket, and the fabric width direction of level land perching knife is X-direction, sets up XYZ rectangular coordinate system；In YZ plane, the pin joint of be synchronized with the movement frame and hinged seat is A, land level scraper The lower shovel face minimum point of cutter is the intersection point C that B, A are perpendicular to shovel face, crosses O point and is parallel to friendship level land, shovel face The intersection point of bottom surface of shovel be D, β be the angle of OD and Y-axis negative direction, satisfiedAfter optimization Δ T=Tmax-Tmin≤9.5mm, makes the change of land level scraper knife up journey and laser pickoff elevation near-synchronous.

3. according to a kind of rotary type paddy field laser flatting machine described in claim 1, it is characterised in that: described synchronization Movement frame is inverted U-shaped；The quantity of hinged seat is two, and the inverted U-shaped lower end with the frame that is synchronized with the movement connects respectively Connect.

4. according to a kind of rotary type paddy field laser flatting machine described in claim 1, it is characterised in that: described level land Perching knife include a main perching knife, about two secondary perching knives, two drive about secondary perching knife relative to main perching knife to The folding driving device of front folding；The main perching knife being connected with hinged seat is positioned at centre, and about two secondary perching knives divide It is not positioned at the left and right sides of main perching knife, and left and right pair perching knife is connected with main perching knife rotary type.

5. according to a kind of rotary type paddy field laser flatting machine described in claim 4, it is characterised in that: take main perching knife Fabric width be X ' axle, shovel face is X ' Y ' plane, from X ' Y ' plane point to main perching knife the positive direction that front is Z ' axle, Set up X ' Y ' Z ' rectangular coordinate system；The secondary perching knife in left and right is that L, L are parallel relative to the pivot center that main perching knife rotates In Y ' Z ' plane, and the angle of the projection that L is on Y ' Z ' and Y ' axle is α, 6 °≤α≤10 °；The secondary perching knife phase in left and right Main perching knife forward upward is folded.

6. according to a kind of rotary type paddy field laser flatting machine described in claim 4, it is characterised in that: described folding Driving means is Foldable hydraulic oil cylinder, corresponding about an one secondary perching knife of Foldable hydraulic oil cylinder；Foldable hydraulic One end of oil cylinder is hinged with main perching knife, and the other end is hinged with left and right pair perching knife；Foldable hydraulic oil cylinder is reduced to the shortest Time, main perching knife is generally aligned in the same plane with left and right pair perching knife；Foldable hydraulic oil cylinder elongation time, left and right pair perching knife to The front of main perching knife folds, and reduces shovel width.

7. according to a kind of rotary type paddy field laser flatting machine described in claim 6, it is characterised in that: described main shovel The back side of cutter and left and right pair perching knife is equipped with hinged ear, between main perching knife and left and right pair perching knife by hinged ear even Connecing, main perching knife and Foldable hydraulic oil cylinder are connected by hinged ear, and left and right pair perching knife and Foldable hydraulic oil cylinder pass through Hinged ear connects.

8. according to a kind of rotary type paddy field laser flatting machine described in claim 1, it is characterised in that: described suspension Frame is provided with the leveling rotating spindle extended along fore-and-aft direction, equipped with bearing block and bearing on leveling rotating turret, By leveling rotating spindle and the cooperation of bearing, leveling rotating turret rotates around leveling rotating spindle；On hanger bracket Being also equipped with leveling hydraulic jack, the telescopic end of leveling hydraulic jack is hinged with leveling rotating turret, leveling hydraulic pressure When oil cylinder stretches, leveling rotating turret swings relative to hanger bracket.

9. according to a kind of rotary type paddy field laser flatting machine described in claim 1, it is characterised in that: it also includes connecing Receive device mounting rod and receptor raise-lower hydraulic oil cylinder；Laser pickoff is fixed on the receptor being vertically arranged and installs The upper end of bar, is arranged on the liter of the receptor raise-lower hydraulic hydraulic oil cylinder driving receptor mounting rod being synchronized with the movement on frame Fall, regulates the relative position of laser pickoff and laser plane.