CN105874929B - A kind of rotary type paddy field laser flatting machine - Google Patents

Abstract

The invention relates to a rotary paddy field laser grader, which includes a suspension frame, a leveling turret, a synchronous movement rod, a synchronous movement frame, and a leveling blade; the leveling turret is connected to the suspension frame through a bearing seat, and is characterized in that: It also includes two articulated seats, the lower end of which is fixed to the lower part of the leveling blade, and the upper end is hinged to the synchronous movement frame; the leveling turret, the synchronous movement rod, the synchronous movement frame, the articulated seat together with the leveling blade and the leveling turret The parallelogram mechanism is hinged sequentially, and the connection line between the hinge point of the upper end of the leveling blade and the hinge point of the hinge seat is located on one side of the parallelogram, and the synchronous motion frame and the leveling turret are vertically arranged; the synchronous motion frame drives the laser The receiver rises and falls synchronously. The invention realizes the synchronization of the elevation of a rotating type leveling blade and a translation type laser receiver, and has higher leveling precision, and belongs to the technical field of agricultural paddy field tillage equipment.

Description

A rotary paddy field laser grader

technical field

The invention relates to an agricultural paddy field cultivating machine tool, in particular to a rotary paddy field laser grader.

Background technique

At present, in my country's agricultural irrigation, surface irrigation is dominant, but the utilization rate of irrigation water is low, and there is still a great potential for water saving. Fine land leveling is one of the important prerequisites for improving the performance of surface irrigation systems, and it is one of the important basic measures to improve the quality of surface irrigation. The most important feature of the laser leveling system is to save agricultural water, which can improve the effect of agricultural water use and save water by 30% to 50%. Because of the high flatness of the cultivated land after leveling, it is beneficial to improve the emergence rate of crop irrigation, improve the growth environment of crops, and improve the quality of agricultural products. With high-precision land leveling operations, the crop yield can be increased by 20% to 30%; after using laser precision leveling, the applied chemical fertilizers are stored in the roots of the crops, and the distribution is even without fertilizer loss and defertilization, reducing environmental pollution. Pollution, fertilizer utilization increased by 20%.

At present, the laser graders for paddy fields in my country generally move vertically up and down through hydraulic drive and the leveler shovel hinged at the end of the parallel connecting rod, so as to realize the elevation adjustment of the leveler. Because the grader is heavy, the relative pressure difference between the rise and fall of the grader is relatively large, which seriously affects the stability of the center of gravity of the grader and the automatic adjustment control of the height of the grader. Therefore, a new type of laser leveler for paddy fields is needed to meet the needs of precise laser leveling for paddy fields.

CN103583101A discloses a leveling shovel elevation adjustment mechanism of a paddy field laser grader. A parallelogram mechanism is used to adjust the elevation of the leveling shovel, and the leveling shovel is used as one side of the parallelogram mechanism, which is easy to control and improve the leveling accuracy of the paddy field laser leveler . However, this structure has the following disadvantages: 1. The shovel rotates while the laser receiver moves in translation, so the elevation change of the shovel and the elevation change of the laser receiver are asynchronous, resulting in large errors. 2. The flat ground blade cannot be folded, the width is large, and transportation is inconvenient.

Contents of the invention

Aiming at the technical problems existing in the prior art, the object of the present invention is to: optimize the structure of the existing rotary leveling blade elevation adjustment mechanism, and provide a method for approximately synchronizing the elevation change of the leveling blade and the elevation change of the laser receiver. A rotary paddy field laser grader with more accurate results and higher leveling efficiency.

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

A rotary paddy field laser grader, including a suspension frame, a leveling turret, a synchronous movement rod, a synchronous movement frame, and a leveling blade; the leveling turret is connected to the suspension frame through a bearing seat, and it is characterized in that it also includes two A hinged seat, the lower end of the hinged seat is fixed to the lower part of the leveling blade, and the upper end is hinged to the synchronous movement frame; the leveling turret, the synchronous movement rod, the synchronous movement frame, the hinged seat, the leveling blade, and the leveling turret are hinged in turn to form Parallelogram mechanism, and the connection line between the hinge point of the upper end of the leveling blade and the hinge point of the hinge seat is located on one side of the parallelogram, the synchronous movement frame and the leveling turret are vertically arranged; the synchronous movement frame drives the laser receiver to synchronize lift.

The hinge point of the leveling turret and the flat blade is O, and the positive direction of the Y-axis is vertically upward after taking the O point, and the positive direction of the Z-axis is perpendicular to the Y-axis from the synchronous motion frame to the suspension frame, and the width of the flat blade The direction is the X-axis direction, and the XYZ Cartesian coordinate system is established; on the YZ plane, the hinge point of the synchronous motion frame and the hinged seat is A, the lowest point of the lower shovel surface of the flat blade is B, and the intersection point C of A perpendicular to the shovel surface, The intersection point passing through point O and parallel to the shovel surface and the bottom surface of the flat shovel is D, and β is the angle between OD and the negative direction of the Y axis, satisfying After optimization, ΔT=Tmax-Tmin≤9.5mm, so that the elevation change of the leveling blade is approximately synchronized with the elevation of the laser receiver. The approximate synchronization mentioned here means that the elevation error in the working area is very small, up to 4.75%.

The synchronous movement frame is in the shape of an inverted U; the number of hinge seats is two, which are respectively connected with the lower ends of the inverted U shape of the synchronous movement frame.

The leveling blade includes a main blade, two left and right auxiliary blades, and two folding drive devices that drive the left and right auxiliary blades to fold forward relative to the main blade; the main blade connected to the hinge seat is located in the middle, and the two left and right The auxiliary blades are respectively located on the left and right sides of the main blade, and the left and right auxiliary blades are rotatably connected with the main blade.

Take the width of the main shovel as the X' axis, the shovel surface as the X'Y' plane, pointing from the X'Y' plane to the front of the main shovel as the positive direction of the Z' axis, and establish the X'Y'Z' rectangular coordinates system; the rotation axis of the left and right auxiliary blades relative to the main blade is L, L is parallel to the Y'Z' plane, and the angle between the projection of L on Y'Z' and the Y' axis is α, 6°≤ α≤10°; the left and right auxiliary blades are folded forward and upward relative to the main blade.

The folding driving device is a folding hydraulic cylinder, and one folding hydraulic cylinder corresponds to a left and right auxiliary blade; one end of the folding hydraulic cylinder is hinged to the main blade, and the other end is hinged to the left and right auxiliary blades; when the folding hydraulic cylinder is shortened to the shortest, the main blade Located on the same plane as the left and right auxiliary blades; when the folding hydraulic cylinder is extended, the left and right auxiliary blades fold toward the front of the main blade to reduce the width of the blade.

There are hinged ears on the back of the main blade and the left and right auxiliary blades. The main blade and the left and right auxiliary blades are connected by hinged ears. The main blade and the folding hydraulic cylinder are connected by hinged ears. The cylinders are connected by hinged ears.

The suspension frame is provided with a leveling and rotating main shaft extending along the front and rear directions, and the leveling turret is equipped with bearing seats and bearings. Through the cooperation of the leveling and rotating main shaft and the bearing, the leveling turret rotates around the leveling and rotating main shaft; the suspension frame A leveling hydraulic cylinder is also installed on the top, and the telescopic end of the leveling hydraulic cylinder is hinged with the leveling turret. When the leveling hydraulic cylinder is telescopic, the leveling turret swings left and right relative to the suspension frame.

A rotary paddy field laser grader, which also includes a receiver mounting rod and a receiver lifting hydraulic cylinder; the laser receiver is fixed on the upper end of the vertical receiver mounting rod, and the receiver lifting hydraulic cylinder is installed on a synchronous movement frame Drive the rise and fall of the receiver mounting rod to adjust the relative position of the laser receiver and the laser plane.

Generally speaking, the present invention has following advantages:

1. Optimize the leveling blade elevation adjustment mechanism (CN103583101A) of an existing paddy field laser grader. By setting the hinged seat, the rear end of the leveling blade is lowered, so that the leveling blade is used as a component of the parallelogram mechanism But it is not located on one side of the parallelogram, so that the elevation change of the leveling blade and the elevation change of the laser receiver are as close as possible. When it satisfies a specific formula, the elevation difference between the leveling blade and the laser receiver is minimized, and the synchronous movement of the elevation of the rotary leveling blade and the translational laser receiver is realized, and the leveling accuracy is higher.

2. The foldable flat blade structure is adopted to reduce the width to facilitate transportation.

3. The left and right auxiliary blades adopt the forward and upward inclined folding method. When folding forward 90 degrees, the tip of the left and right auxiliary blades is lifted upwards, increasing the distance from the blade tip to the ground, so that the distance between the blade tip and the ground The distance is greater than the distance from the main shovel to the ground to protect the tip of the blade so as to facilitate walking in and out of paddy fields and mechanical farming roads.

4. Hinged and fixed by the hinged lugs arranged on the back, the hinged lugs at the upper end are longer, while the hinged lugs at the lower end are shorter, so that the inclined structure of the rotation axis L can be realized with a simple structure.

5. Adopt the structure of leveling and rotating main shaft, bearing, bearing seat, and leveling hydraulic cylinder, and measure the inclination angle of the leveling turret through the inclination sensor, and adjust the position of the leveling turret in real time to keep it in a horizontal position all the time .

6. The lifting hydraulic cylinder of the receiver automatically controls the lifting of the laser receiver, which is convenient to adjust the relative height of the laser plane established by the laser receiver and the laser transmitter, so that the operator of the grader can set and adjust it on the seat, saving time , improve work efficiency.

Description of drawings

Figure 1 is a side view of the present invention.

Fig. 2 is a perspective view of the present invention.

Fig. 3 is a diagram of the use state of the foldable leveling blade. In this diagram, the included angle is 0 degrees, that is, only the front folding method is adopted.

Fig. 4 is a schematic diagram of the oblique folding method of the flat blade.

Figure 5a is an exploded view of the tilted folded configuration of the grading blade.

Figure 5b is an assembled view of Figure 5a.

Fig. 6 is a diagram of the use state of the foldable leveling blade. In this diagram, the included angle is greater than 0 degrees, that is, the front and upper folds are adopted.

Fig. 7 is a schematic diagram of a parallelogram mechanism.

Among them, in the figure, 1 is the suspension frame, 2 is the ground blade, 3 is the leveling turret, 4 is the synchronous movement frame, 5 is the synchronous movement rod, 6 is the main blade, 7 is the left and right auxiliary blades, 8 is the Folding hydraulic cylinder, 9 is the elevation cylinder support, 10 is the bearing seat, 11 is the leveling and rotating main shaft, 12 is the elevation hydraulic cylinder, 13 is the receiver installation rod, 14 is the receiver lifting hydraulic cylinder, 15 is the laser receiver, 16 17 is a leveling hydraulic cylinder, 18 is a laser signal, 19 is a three-point suspension, 20 is an articulated seat, 21 is a tractor rear wheel, 22 is an articulated ear, and 23 is a swash plate.

Detailed ways

The present invention will be described in further detail below.

A rotary paddy field laser grader comprises five parts, a leveling blade, a leveling turret, a synchronous movement frame, a synchronous movement rod and a suspension frame, and also includes two hinged seats. Set the shovel width direction parallel to the flat blade as the X axis, the vertical direction as the Y axis, and the direction perpendicular to the XY plane pointing to the three-point suspension as the Z axis, and establish an XYZ rectangular coordinate system. Set the shovel width direction parallel to the flat blade as the X′ axis, the shovel surface of the flat blade as the Y’ axis, and the direction perpendicular to the X’Y’ plane pointing to the front of the flat blade as the Z’ axis, and establish X’ Y'Z' Cartesian coordinate system.

The flat ground blade includes a main blade, two left and right auxiliary blades and two folding hydraulic cylinders. The left and right sides of the main blade include the hinged ears hinged with the left and right auxiliary blades and the hinged ears with the folding hydraulic cylinder, the left and right auxiliary blades are hinged with the main blade and the hinged ears with the folding hydraulic cylinder Hinged ears. The hinged ears of the main blade and the hinged ears of the left and right auxiliary blades are hinged to form a rotation axis L, which is parallel to the Y'Z' plane and the angle between the projection on the Y'Z' plane and Y' is α, that is, L is the inclination style design. The hinged ears are located on the back of the main blade and the left and right auxiliary blades. In a group of hinged ears that form a rotation axis, the length of the upper hinged ear is greater than the length of the lower hinged ear, so the distance from the upper end of the rotation axis to the shovel surface is greater than The distance from the lower end of the rotation axis to the shovel surface. The left and right auxiliary blades are arranged symmetrically on both sides of the main blade.

Under the action of the folding hydraulic cylinder, the left and right auxiliary blades are folded forward and upward relative to the main blade. When working in the field, the two folding hydraulic cylinders are shortened to the shortest, and the left and right auxiliary blades are fully opened to be on the same plane as the main blade. The left and right auxiliary blades and the main blade are equipped with force slanting plates. When the left and right auxiliary blades are fully opened, the force slanting plates of the main blade and the left and right auxiliary blades are completely fitted together to play the role of limit and force , so that the two folding hydraulic cylinders are not stressed when working on flat ground. When the two folding hydraulic oil cylinders are extended to the longest, the left and right auxiliary blades are folded forward and upward at 90°. The rotation axis of the main blade and the left and right auxiliary blades, the rotation axis of the folding oil cylinder and the main blade intersect the shovel surface of the ground blade as α, so that the bottom surface of the left and right auxiliary blades is relative to the bottom surface of the main blade after being folded forward by 90° At an angle of α, when the grader is lifted upwards through the tractor's three-point suspension mechanism, the distance between the left and right auxiliary blade tips and the ground is increased. The left and right auxiliary blades are folded forward at 90° and the angle α realizes the folding of the blades on the flat ground to reduce the width and achieve the purpose of convenient entry and exit of paddy fields, machine-cultivated roads, and transportation.

The upper end of the leveling blade is hinged to the lower end of the leveling turret, and the central axis of the hinge is parallel to the X axis; the elevation cylinder bracket is located in the middle of the leveling turret, one end is fixed to the leveling turret, and the other end is connected to the elevation hydraulic cylinder The upper end of the hydraulic cylinder is hinged, while the lower end of the elevation hydraulic cylinder is hinged with the middle of the main blade; the telescopic drive of the elevation hydraulic cylinder drives the leveling blade to rotate up and down around the axis of the hinge between the leveling blade and the leveling turret, thereby adjusting the leveling blade. The relative height between the bottom surface and the mud surface realizes the elevation adjustment of the paddy field laser grader. Rotating around the hinged central axis to achieve height adjustment, not only the force of the height hydraulic cylinder is small, but also the response speed of the height hydraulic cylinder is faster and the linearity is good, which improves the precision of height control and realizes accurate leveling.

The synchronous movement frame is in an inverted U shape, the lower ends of the left and right vertical connecting rods are hinged with the upper end of the hinged seat, one end of the synchronous movement rod is hinged with the synchronous movement frame, and the other end is hinged with the leveling turret, so that the leveling turret can be leveled The shovel together with the hinged seat, the synchronous movement frame and the synchronous movement bar form a parallelogram mechanism by being mutually hinged. During the rotation of the leveling blade, the synchronous motion frame is always kept vertical, and the elevation change of the leveling blade is the same as that of the synchronous motion frame, so that the elevation change of the leveling blade can be accurately measured by the laser receiver. The upper end of the articulated seat is hinged with the synchronous movement frame, and the lower end is fixed with the leveling blade, so that the lower end of the leveling blade is sunk, so that it becomes an integral part of the parallelogram mechanism and is not located on one side of the parallelogram. The design of the hinged seat needs to satisfy the following formula:

ΔT=Tmax-Tmin, where T is the coordinate difference between the hinge point of the hinge seat and the bottom surface of the flat blade in the Y-axis direction, and ΔT is the elevation difference between the elevation of the flat blade and the laser receiver within the elevation rotation range of the flat blade, The elevation difference equals zero, making the elevation change of the grading blade the same as the elevation change of the laser receiver.

The receiver lifting hydraulic cylinder is fixed on the middle part of the cross bar of the synchronous movement frame, the receiver mounting rod and the receiver lifting hydraulic cylinder are fixed through threaded connection, and the laser receiver is installed on the upper end of the receiver mounting rod. The receiver lifting hydraulic cylinder is convenient to adjust the relative height of the laser plane established by the laser receiver and the laser transmitter, so that the operator of the motor grader can set and adjust it on the seat, saving time and improving work efficiency.

The front end of the suspension frame is provided with a three-point suspension, which is connected with the three-point suspension mechanism of the tractor. The rear end of the suspension frame is provided with a leveling and rotating main shaft parallel to the Z axis, and the leveling and rotating main shaft is connected with the leveling turret through a bearing and a bearing seat. The middle part of the suspension frame places components such as the hydraulic system and the gearbox.

The leveling turret is rotationally connected with the leveling and rotating main shaft at the rear end of the suspension frame through bearings, the bearing seat is fixed in the middle of the leveling turret, the leveling hydraulic cylinder is installed on the suspension frame, and the lower end is hinged to the right side of the leveling turret. The expansion and contraction of the leveling hydraulic cylinder keeps the leveling turret always horizontal during operation, and the synchronous movement frame and laser receiver are always kept vertical.

The leveling blade is always kept level during operation, the lateral inclination of the tractor or the suspension frame is measured by the inclination sensor, and the leveling blade is adjusted by controlling the expansion and contraction of the leveling hydraulic cylinder to maintain the level, and the elongation of the leveling hydraulic cylinder is measured by the displacement sensor to form a closed loop control.

When the leveling blade enters and exits the paddy field and is transported, in order to reduce the width, the left and right auxiliary blades need to be folded forward, and because when the three-point suspension mechanism of the tractor raises the whole paddy field laser grader, the paddy field laser grader tilts forward α degree, the distance from the tip of the folded left and right auxiliary blades to the ground is less than the lifting height of the paddy field laser grader, and further decreases with the increase of the width of the left and right auxiliary blades, and even the distance between the left and right auxiliary blades The tip of the knife touches the ground, making it difficult or impossible to get in and out of the paddy field, as shown in Figure 3.

As shown in Figure 4, Figure 5a, and Figure 5b, when the elevation hydraulic cylinder is extended to the longest, the flat blade is in a vertical position. At this time, in order to make the left and right auxiliary blades fold forward at α degrees, the main blade and The rotation axes of the left and right auxiliary blades form an angle of α with the direction of the vertical plane intersection of the main blade. When the shovel surface of the shovel is on the same plane as the shovel surface of the main shovel, the central axis of the hinge point of the main shovel and the central axis of the hinge point of the left and right auxiliary blades are parallel to each other and the projections on the YOZ plane are collinear; Interference occurs and folds forward 90°. At this time, the central axis of the hinge ear of the folding cylinder is parallel to the YOZ plane and the included angle with the shovel surface is α. When the folding hydraulic cylinder drives the left and right auxiliary blades to rotate 90° around the central axis of the hinge point, The angle between the left and right auxiliary blades and the main blade is α, that is, the angle with the positive direction of the Z axis is α; in order to make the left and right auxiliary blades coincide with the main blade when the left and right auxiliary blades are opened, the hinge ear axis of the left and right auxiliary blades The distance to the sideline of the shovel is equal to the distance from the central axis of the hinged ear of the main blade to the sideline; as shown in Figure 6, the purpose of reducing the width and facilitating transportation is achieved, and the whole machine is lifted by the three-point suspension mechanism of the tractor. After folding, the left and right auxiliary blades are parallel to the ground or tilted up at a certain angle to increase the distance between the tip of the left and right auxiliary blades of the leveling shovel and the ground.

Field work: The laser transmitter is installed horizontally, and by rotating the laser signal it emits, a reference plane is established for the laser receiver, and this reference plane remains unchanged during the working process. Due to the difference in softness and hardness of paddy field mud feet and unevenness, when the tractor attached to the laser grader is working in the field, the body will definitely fluctuate up and down or tilt left and right. When the fuselage becomes higher than the initial plane, the lower end of the laser receiver receives the laser signal and converts it into an electrical signal, which controls the elevation hydraulic cylinder to extend and drive the leveling blade down, so that the leveling blade and the laser receiver are always kept at the original position on the working plane. When tilting left and right, adjust the leveling turret and leveling blade to always maintain a horizontal position through the expansion and contraction of the leveling hydraulic cylinder. Because the elevation hydraulic cylinder drives the main blade to rotate, and then drives the synchronous motion frame to maintain vertical movement through the hinged seat 0, the main blade converts the rotation around point O into the translation of the synchronous motion frame in the vertical direction, which must be The elevation change of the leveling blade is inconsistent with the elevation change of the laser receiver, resulting in a large leveling error; as shown in Figure 7, in order to make the leveling error smaller, the hinged seat needs to meet:

ΔT=Tmax-Tmin, where T is the coordinate difference between the hinge point of the hinge seat and the bottom surface of the flat blade in the Y-axis direction, and ΔT is the elevation difference between the flat blade elevation and the laser receiver within the elevation rotation range of the flat blade, and the elevation difference Equal to zero to make the grading blade elevation change the same as the laser receiver elevation change. In reality, ΔT can only be the optimal solution under the premise of ensuring the stability of the motion of the synchronous motion frame and eliminating the interference between components. After optimizing the hinge point of the hinged seat, the elevation change of the flat ground blade and the elevation change of the receiver ΔT≤ 9.5mm, while the entire height adjustment area is 400mm, the error is only 4.75%, which is negligible, so after optimization, the leveling blade height and the laser receiver height adjustment movement can be regarded as completely synchronous motion.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (8)

1. a kind of rotary type paddy field laser flatting machine, including hanger bracket, rotating turret is leveled, bar is moved synchronously, moves synchronously frame, is flat Ground perching knife；Leveling rotating turret is connect with hanger bracket by bearing block, it is characterised in that: it further includes two hinged seats, hinged seat Lower end and the lower part of level land perching knife fix, upper end with to move synchronously frame hinged；Leveling rotating turret moves synchronously bar, synchronous fortune Moving frame, hinged seat successively hingedly form parallelogram mechanism, and the upper end of level land perching knife together with level land perching knife, leveling rotating turret Hinge joint and the line of hinge joint of hinged seat be located in a line of parallelogram, move synchronously frame and leveling rotating turret It is vertically arranged；It moves synchronously frame and drives laser pickoff synchronization lifting；

The hinge joint for leveling rotating turret pacifically perching knife is O, and took O point is Y-axis positive direction straight up, perpendicular to Y-axis from same Walking movement frame and being directed toward hanger bracket is Z axis positive direction, and the breadth direction of level land perching knife is X-direction, establishes XYZ rectangular coordinate system； In YZ plane, the hinge joint for moving synchronously frame and hinged seat is A, and the lower shovel face minimum point of level land perching knife is B, and A is perpendicular to shovel The intersection point C in face, crossing O point and being parallel to shovel face to hand over the intersection point of the bottom surface of land level scraper is D, and β is the angle of OD and Y-axis negative direction, full FootOptimization Δ T=Tmax-Tmin≤9.5mm afterwards makes the variation of land level scraper knife up journey and laser pickoff elevation near-synchronous.

2. a kind of rotary type paddy field laser flatting machine described in accordance with the claim 1, it is characterised in that: the frame that moves synchronously is in It is inverted U-shaped；The quantity of hinged seat is two, is connect respectively with the inverted U-shaped lower end for moving synchronously frame.

3. a kind of rotary type paddy field laser flatting machine described in accordance with the claim 1, it is characterised in that: the level land perching knife includes One main perching knife, two or so secondary perching knives, two secondary perching knives in driving left and right drive dress relative to the folding of main perching knife collapsed forward It sets；The main perching knife connecting with hinged seat is located at centre, and two or so secondary perching knives are located at the left and right sides of main perching knife, and left and right Secondary perching knife is connect with main perching knife rotary type.

4. a kind of rotary type paddy field laser flatting machine described in accordance with the claim 3, it is characterised in that: the breadth for taking main perching knife is X ' axis, shovel face are X ' Y ' plane, are the positive direction of Z ' axis from the front that X ' Y ' plane is directed toward main perching knife, establish the right angle X ' Y ' Z ' seat Mark system；The pivot center that the secondary perching knife in left and right is rotated relative to main perching knife is L, and L is parallel to Y ' Z ' plane, and throwing of the L on Y ' Z ' The angle of shadow and Y ' axis is α, 6 °≤α≤10 °；The secondary perching knife in left and right is folded relative to main perching knife forward upward.

5. a kind of rotary type paddy field laser flatting machine described in accordance with the claim 3, it is characterised in that: the folding driving device For Foldable hydraulic oil cylinder, corresponding one or so secondary perching knife of a Foldable hydraulic oil cylinder；One end of Foldable hydraulic oil cylinder and main perching knife Hingedly, the other end and the secondary perching knife in left and right are hinged；Foldable hydraulic oil cylinder is reduced to most in short-term, and main perching knife is located at same with the secondary perching knife in left and right Plane；When Foldable hydraulic oil cylinder extends, the secondary perching knife in left and right is folded to the front of main perching knife, reduces shovel width.

6. a kind of rotary type paddy field laser flatting machine according to claim 5, it is characterised in that: the main perching knife and left and right The back side of secondary perching knife is equipped with hinged ear, is connected between the secondary perching knife of main perching knife and left and right by hinged ear, main perching knife and folding liquid Compressing cylinder is connected by hinged ear, and the secondary perching knife in left and right is connected with Foldable hydraulic oil cylinder by hinged ear.

7. a kind of rotary type paddy field laser flatting machine described in accordance with the claim 1, it is characterised in that: the hanger bracket is equipped with The leveling rotation main shaft extended along anteroposterior direction, levels and bearing block and bearing is housed on rotating turret, rotate main shaft by leveling With the cooperation of bearing, rotating turret is leveled around leveling and rotates main axis；It is also equipped with leveling hydraulic cylinder on hanger bracket, levels liquid The telescopic end of compressing cylinder and leveling rotating turret are hinged, when leveling hydraulic cylinder is flexible, level rotating turret relative to hanger bracket or so It swings.

8. a kind of rotary type paddy field laser flatting machine described in accordance with the claim 1, it is characterised in that: it further includes receiver peace Fill bar and receiver raise-lower hydraulic oil cylinder；Laser pickoff is fixed on the upper end for the receiver mounting rod being vertically arranged, and is mounted on The lifting for moving synchronously the receiver raise-lower hydraulic oil cylinder driving receiver mounting rod on frame, adjusts laser pickoff and laser is flat The relative position in face.