Claims:We claim:
1. An integrated hitch control system for laser land leveller (151) operations in agricultural vehicles, comprising of : atleast a laser transmitter (152), positioned on the farm land (153), wherein said laser transmitter (152) emits the laser beam (154); a hitch frame (159), positioned at the trailing end of the agricultural vehicle (157), wherein said hitch frame (159) is connected to the single hitch point of the tractor; a scrapper bucket (161), detachably coupled to one end of the said hitch frame (159); a mast unit (158), positioned on the scrapper bucket (161); an adjustable rod (160), positioned at the top end of the mast unit (158); an electric motor (156), positioned at the bottom end of the mast unit (158), wherein operating height of the said adjusting rod (160) is controlled via the said electric motor (156); atleast a laser receiver (155), positioned on the mast unit (158), Wherein said laser receiver (155) is operatively affixed to the top end of the said adjustable rod (160); a hydraulic cylinder (162), positioned at the trailing end of the scrapper bucket (161), wherein said hydraulic cylinder (162) is positioned in-between the said scrapper bucket (161) and a trailing wheel axle (163), wherein said hydraulic cylinder (162) is fluidly coupled to the said scrapper bucket (161); a control valve (167), operatively coupled to the said hydraulic cylinder (162), wherein said control valve (167) is also operatively coupled to the three point linkage hitch system; an electronic control unit (ECU) (164) for data processing, positioned in connection with the said control valve (167), wherein said ECU (164) actuates the said control valve (167); and a control panel (165),is directly linked to communicate with the said ECU (164), Wherein said ECU (164) receives inputs from the control panel (165), wherein said control panel (165) is provided with a user interface structure for laser land leveler control and three point linkage hitch control.

2. An integrated hitch control system for laser land leveller (151) operations, as claimed in claim 1, wherein said laser transmitter (152) is positioned at the reference point on the farm land (153).

3. An integrated hitch control system for laser land leveller (151) operations, as claimed in claim 1, Wherein said laser transmitter (152) emits laser signal (154) in a horizontal plane.

4. An integrated hitch control system for laser land leveller (151) operations, as claimed in claim 1, Wherein said laser transmitter (152) emits the laser signal (154) in a rotating horizontal plane at fixed speed, wherein said angle of rotation ranges from 0° to 360°.
5. An integrated hitch control system for laser land leveller (151) operations, as claimed in claim 1, wherein said adjustable rod (160) is a vertically extendable rod.

6. An integrated hitch control system for laser land leveller (151) operations, as claimed in claim 1, wherein said adjustable rod (160) is a telescopically extendable rod.

7. An integrated hitch control system for laser land leveller (151) operations, as claimed in claim 1, wherein said laser receiver (155) is vertically adaptable, wherein height of the said laser receiver (155) is adjusted by varying the vertical height of the adjustable rod (160) by means of the electric motor (156).

8. An integrated hitch control system for laser land leveller (151) operations, as claimed in claim 1, wherein said control valve (162) is a three point linkage hitch system control valve.

9. An integrated hitch control system for laser land leveller (151) operations, as claimed in claim 1, wherein said hydraulic cylinder (162) is a single acting cylinder.

10. An integrated hitch control system for laser land leveller (151) operations, as claimed in claim 1, wherein said control panel (165) is a unified control panel for hitch control system and laser land leveling system.

11. A method of operation of the land leveller implement controlled via the integrated hitch control system (151), comprises steps of :
a) pre-calibrating the electronic control unit (164) with desired uniform leveling height of the farm land (153), wherein said uniform reference height is the mean point of laser receiver (155) vertical reception zone, wherein said reference height is adjusted by adjusting the vertical height of the laser receiver(155) through varying the adjustable rod (160) height;
b) transmitting of laser signals (154) from the laser transmitter (152), wherein said laser signals (154) are emitting in the form of a laser beam;
c) receiving/sensing the transmitted laser signals (154) by the laser receiver (155), wherein said laser receiver (155) is mounted on the mast unit (158) wherein height of the said laser receiver (155) is adjusted by varying the vertical height of the adjustable rod (160) ;
d) transmitting the received signals to the electronic control unit (164), wherein said signals are transmitted by the laser receiver in the form of data to the electronic control unit (164);
e) processing of the received data by the electronic control unit (164), wherein said data is processed with respect to the pre-calibrated reference height for uniform leveling of the farm land;
f) actuating the hydraulic cylinder (162) based on the resulting processed data signal received from the electronic control unit (164), wherein said actuation of hydraulic cylinder (162) via the control valve (167) maintains the scrapper bucket (161) at a desired height, wherein said desired height of the scrapper bucket is calculated based on the laser signal received by the laser receiver (155) and the pre-calibrated reference height ;
g) controlling the scrapper bucket (161) at the desired height in accordance with the control valve (167) actuation by means of the said hydraulic cylinder (162), wherein said scrapper bucket (161) is controlled by controlling the hydraulic fluid flow in the hydraulic cylinder (162); and
h) leveling the farm land uniformly at the desired height level by means of controlling the scrapper bucket (161).

12. A method of operation of the land leveller implement controlled via the integrated hitch control system (151), as claimed in claim 11, wherein said control valve (162) is a three point linkage hitch control valve.

13. A method of operation of the land leveller implement controlled via the integrated hitch control system (151), as claimed in claim 11, wherein said hydraulic cylinder (162) is a single acting cylinder.

14. A method of operation of the land leveller implement controlled via the integrated hitch control system (151), as claimed in claim 12, wherein said scrapper bucket (161) is controlled by controlling the hydraulic fluid flow in the hydraulic cylinder(162).

15. A method of operation of the land leveller implement controlled via the integrated hitch control system (151), wherein said mode of operation of the land leveller implement is selected from automatic, and/or manual. , Description:INTEGRATED HITCH CONTROL SYSTEM FOR LASER GUIDED LAND LEVELER OPERATION AND METHOD THEREOF
FILED OF THE INVENTION
The present invention generally relates to agricultural farm implements, in particular the present invention is related to a laser land leveller implement controlled via the hitch control hydraulic system of the agricultural vehicles.
BACKGROUND OF THE INVENTION
Land leveler is a high-speed, efficient, high-precision and multi-purpose earthwork engineering machinery, employed in operations such as ground levelling, ditching, slope scraping, soil pushing, loosening, compacting, distributing, mixing and the like. Land leveller acts as one of the important engineering implement in large-area constructions such as mine construction, road construction, water conservancy construction, farmland improvement etc.
In particular, in farmland operations land levelling is an essential process where the farm land is maintained at one particular uniform level for efficient irrigation. Land levelling is a vital operation in soil preparation which is performed after pulverization of the soil by primary and secondary tillage implement. Land levelling operation is capable of improving surface flatness of farmland not only improves water usage efficiency and water distribution, but also reduces soil erosion, increases crop yield, reduces fertilizer usage and it is important to improve the ground irrigation method. Conventional land leveling method uses grader as earth working implement for shaping and leveling operations. These graders consist of a flat shovel installed between the front and rear axles of the machine body having a flexible movement and convenient operation. These graders are widely used in large construction environments such as highways and airports. For rural roads and small area land, manual leveling is often used due to site limitation. Thus the conventional land levelling techniques including artificial vision leveling, flat-floor machinery, grader implement and the like, has several disadvantages such as low working efficiency, high labour intensity, complicated machinery, high manufacturing cost, large implement body not suitable for small-area land operations, and poor flatness during levelling.
In recent times laser land leveler is used for arranging and leveling the land along the farmland plane by the aid of the laser emitter and the laser receiver. Laser land leveler is a novel product which applies laser and hydraulic technology to soil preparation operation, precise agricultural machines, and is an advanced land preparation machine. The laser land leveler is mainly composed of a laser emitter, a laser receiver, a control box, a hydraulic control mechanism and a soil scraping shovel. The laser beam is radiated in the horizontal direction at a fixed height on the farm field, and the work is performed using a horizontal plane created by the laser beam as a reference. Functioning of the laser land leveller includes, transmitting the laser beam emitted in the horizontal direction to the beam receiver provided in the land levelling equipment, the receiver sends the laser strike position to the automatic control unit and transforming the received signal into electrical signals for controlling the hitch control valves for adjusting the levelling blade height by lifting or lowering the scraping shovel. The scraping bucket is operated according to the relative position of the laser beam. The operator must simply drive the agricultural vehicle during the operation.
Generally the agricultural land leveler implements are trailed type towed machine, partially self supported, and it is attached to the tractor through single hitch point (Trailer Hitch point). In existing state of the art systems the laser land leveler implements are operated through the auxiliary hydraulics and separate actuation system comprising of external control box and solenoid valve assembly. The following prior-art documents disclose the same.
Chinese patent document 103931290 discloses a laser land leveler and a control system thereof. The laser land leveler comprises a laser emitter, a laser receiver, an angle sensor, a controller, a mast, a hydraulic system and an actuating device, wherein the laser receiver and the angle sensor are arranged on the mast to send instructions to the controller, the hydraulic system can drive the actuating device to adjust the position of a land leveling shovel according to the operation instructions sent by the controller, and the actuating device can adjust the horizontal position of the land leveling shovel to enable the laser land leveler to have a function of automatically adjusting the horizontal position of the land leveling shovel. The control system used here is an independent auxiliary system.
Chinese patent document 107989086 discloses a laser land leveler comprising of a laser transmitter and a land leveler, wherein a laser receiver, a control cabinet, a hydraulic system, scrapers and land wheels are arranged on the land leveler; the laser receiver is connected with the land leveler through a supporting rod; the laser receiver is connected with the control cabinet; the hydraulic system comprises a hydraulic box; the hydraulic box communicates with hydraulic telescopic rods; a hydraulic control valve is arranged on the hydraulic box; the hydraulic control valve controls extension and retraction of the hydraulic telescopic rods; the scrapers are fixedly connected through supporting beams; one ends of the hydraulic telescopic rods are connected with the supporting beams. Here the land leveler is operated with a dedicated control box and hydraulic system for controlling its operation.
Another Chinese patent document 203369061 provides a double-control laser land leveler comprises a traction transmission device, a land leveling device, a control device, a laser emitting device and a laser receiving device, wherein the traction transmission device is connected with the land leveling device; the control device is used for controlling the laser receiving device and the land leveling device to lift; the laser emitting device is used for emitting laser beams and forming laser swinging surfaces; the laser receiving device is used for receiving laser signals and conducting contrastive analysis on the laser signals. Here two laser receiver units and a separate laser land leveller control unit is provided for the operation of the laser land leveller.
All of the above cited prior-art documents uses a separate control unit for hydraulics which is external to the tractor hitch control system for operating and controlling the laser land leveller implement. These control units, hydraulic cylinders and actuators are peripheral and acts as an additional unit on the agricultural vehicle, increasing its load and manufacturing cost. Since these laser land levellers are trailed type and are usually attached to the tractor single hitch point, there is a need in the art for an integrated hitch control system which controls the operation of both the three-point hitch linkage system and the laser land leveller implement system.
The present invention provides an integrated hydraulic hitch control system for laser land leveller implement, where the land leveller implement is controlled via the tractor three point linkage control system. The hydraulic system in the agricultural vehicle which is used for controlling the three point linkage mechanism is used for controlling the laser guided land leveler implement eliminating the need of additional solenoid valve and control unit. The lifting and lowering of the laser land leveler implement is performed by a single acting hydraulic cylinder which is actuated through tractor hitch control system. Further the present invention provides a unified control valve, ECU and control panel with common user interface for laser land leveller implement and tractor hitch control system. The laser land leveller implement control function is an additional feature to the existing tractor hitch control system.
OBJECTIVES OF THE INVENTION
In view of the deficiencies of the prior art, the object of the present invention is to provide an integrated hitch control hydraulic system for operating and controlling the laser land leveller implement, which solves the problem of the above-mentioned state of the art laser land levelers.
The main objective of the present invention is to provide an integrated hydraulic hitch control system for laser land leveller implement, where the land leveller implement is controlled via the tractor three point linkage control system.
Another objective of the present invention is to provide an integrated hitch control system for agricultural vehicle where the hydraulic system used for controlling the three point linkage mechanism is used for controlling the laser guided land leveler implement.
Another objective of the present invention is to provide an integrated hydraulic hitch control system for laser land leveller implement which eliminates the need of additional solenoid valve and control unit for actuating the laser land leveller implement.
Still another objective of the present invention is to provide an integrated hydraulic hitch control system for laser land leveller implement which uses single acting hydraulic cylinder for lifting and lowering the laser land leveler implement.
Yet another objective of the present invention is to provide an integrated hydraulic hitch control system for laser land leveller implement with unified control valve for three point linkage control and laser land leveler implement control applications.
Yet another objective of the present invention is to provide an integrated hydraulic hitch control system for laser land leveller implement with unified electronic control unit for hitch control system and laser land leveler implement system.
Yet another objective of the present invention is to provide an integrated hydraulic hitch control system for laser land leveller implement with unified control panel with user interface for laser land leveler implement system and tractor hitch control system.
Final objective of the present invention is to provide an optimized laser guided land levelling system with electro-hydraulic three point linkage hitch control system.
Accordingly, it is desirable to provide in an agricultural vehicle such as tractor, an integrated hitch control system for laser land leveller implement, where the land leveller implement is controlled via the tractor three point linkage control system eliminating the need of additional hydraulic control valve and control unit for actuating the laser land leveller implement. Furthermore, other desirable features and characteristics of the devices, systems and methods of the herein described exemplary embodiments will become apparent from the subsequent detailed description and the appended claims, taken in conjunction with the accompanying drawings and the foregoing technical field and background.
SUMMARY OF THE INVENTION
The present invention provides an integrated electro hydraulic hitch control system for operating and controlling the laser land leveller implement (151), comprises of : atleast a laser transmitter (152), positioned on the farm land (153) emitting the laser beam (154); a hitch frame (159), positioned at the trailing end of the agricultural vehicle (157), wherein said hitch frame (159) is connected to the vehicle single hitch point; a scrapper bucket (161), detachably coupled to trailing end of the said hitch frame (159); a mast unit (158) positioned on the scrapper bucket (161); an adjustable rod (160), positioned at the top end of the mast unit (158); an electric motor (156), positioned at the bottom end of the mast unit (158), wherein operating height of the said adjusting rod (160) is regulated via the said electric motor (156); atleast a laser receiver (155), positioned on the mast unit (158), Wherein said laser receiver (155) is operatively affixed to the top end of the said adjustable rod (160);; a hydraulic cylinder (162), positioned at the trailing end of the scrapper bucket (161), wherein said hydraulic cylinder (162) is fluidly coupled to the said scrapper bucket (161); a control valve (167) operatively coupled to the said hydraulic cylinder (162), wherein said control valve (167) is also operatively coupled to the three point linkage system which is provided with a mechanical and hydraulic unit; an electronic control unit (ECU) (164) positioned in connection with the said control valve (167); and a control panel (165), positioned to communicate with the said ECU (164).
In an embodiment of the present invention, land leveller implement is controlled via the tractor three point linkage control system. The hydraulic system used for controlling the three point linkage mechanism is used for controlling the laser guided land leveler implement. This eliminates the need of additional hydraulic control valve and electronic control unit for operating the laser land leveller implement.
In an embodiment of the present invention, the integrated hydraulic hitch control system for laser land leveller implement is provided with a unified control valve for three point linkage control and laser land leveler implement control applications. The unified electronic control unit (ECU) controls the operations of both the hitch control system and laser land leveler implement system of the agricultural vehicle.
In an embodiment of the present invention, the integrated hydraulic hitch control system for laser land leveller implement is provided with a unified control panel with user interface for both laser land leveler implement system and tractor hitch control system.
An embodiment of the present invention provides the method of operation of the land leveller implement (151) controlled via an integrated hitch control system, comprises steps of :
a) pre-calibrating the electronic control unit (164) with desired uniform leveling of the farm land (153), wherein said uniform reference height is the mean point of laser receiver (155) vertical reception zone;
b) transmitting laser signals (154) from the laser transmitter (152);
c) receiving/sensing the transmitted laser signals (154) by the laser receiver (155);
d) transmitting the laser signal strike position information on the receiver to the electronic control unit (164);
e) processing of the received data by the electronic control unit (164), wherein said data is processed with respect to the pre-calibrated reference height for uniform leveling of the farm land;
f) actuating the control valve (167) based on the resulting processed data signal received from the electronic control unit (164), wherein said actuation of control valve (167) operates the said hydraulic cylinder (162) thereby maintaining the scrapper bucket (161) at a desired height;
g) controlling the scrapper bucket (161) at the desired height in accordance with the control valve (167) actuation; and
h) leveling the farm land uniformly at the desired height level by means of controlling the scrapper bucket (161).
In an embodiment of the present invention, wherein said mode of operation of the land leveller implement controlled via an integrated hitch control system (151) is selected from automatic, and/or manual.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 represents the land leveller implement controlled via an integrated hitch control hydraulic system for agricultural vehicles according to the present invention.
Figure 2 represents the scrapper bucket positioned at the trailing end of the agricultural vehicle according to the present invention.
Figure 3 depicts the unified control panel with user interface for laser land leveler implement system and agricultural vehicle hitch control system according to the present invention.
While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THEINVENTION WITH RESPECT TO DRAWINGS
The present invention as embodied by an “Integrated hitch control hydraulics for laser guided land leveler operation and method thereof" succinctly fulfils the above-mentioned need(s) in the art. The present invention has objective(s) arising as a result of the above-mentioned need(s), said objective(s) being enumerated below. In as much as the objective(s) of the present invention are enumerated, it will be obvious to a person skilled in the art that, the enumerated objective(s) are not exhaustive of the present invention in its entirety, and are enclosed solely for the purpose of illustration. Further, the present invention encloses within its scope and purview, any structural alternative(s) and/or any functional equivalent(s) even though, such structural alternative(s) and/or any functional equivalent(s) are not mentioned explicitly herein or elsewhere, in the present disclosure. The present invention therefore encompasses also, any improvisation(s)/modification(s) applied to the structural alternative(s)/functional alternative(s) within its scope and purview. The present invention may be embodied in other specific form(s) without departing from the spirit or essential attributes thereof.
Throughout this specification, the use of the word "comprise" and variations such as "comprises" and "comprising" may imply the inclusion of an element or elements not specifically recited.
The present invention aims to overcome the defects of the existing laser land leveler implement by providing an integrated hitch control hydraulics for laser land leveller implement, where the land leveller implement is controlled via the tractor three point linkage control system eliminating the need of additional hydraulic control valve and electronic control unit for operating the laser land leveller implement.
According to the present invention as shown on Fig.1, land leveller implement controlled via an integrated hitch control system (151), comprises of : atleast a laser transmitter (152), positioned on the farm land (153), wherein said laser transmitter (152) emits the laser beam (154); a hitch frame (159), positioned at the trailing end of the agricultural vehicle (157), wherein said hitch frame (159) is connected to the single hitch point of the tractor; a scrapper bucket (161), detachably coupled to one end of the said hitch frame (159); a mast unit (158), positioned on the scrapper bucket (161); an adjustable rod (160), positioned at the top end of the mast unit (158); an electric motor (156), positioned at the bottom end of the mast unit (158), wherein operating height of the said adjusting rod (160) is controlled via the said electric motor (156); atleast a laser receiver (155), positioned on the mast unit (158), wherein said laser receiver (155) is operatively affixed to the top end of the said adjustable rod (160); a hydraulic cylinder (162), positioned at the trailing end of the scrapper bucket (161), as shown in Fig 2 the hydraulic cylinder (162) is placed in-between the said scrapper bucket (161) and a trailing wheel axle (163), wherein said hydraulic cylinder (162) is fluidly coupled to the said scrapper bucket (161); a control valve (167) operatively coupled to the said hydraulic cylinder (162), wherein said control valve (167) is also operatively coupled to the three point linkage hitch system provided with a mechanical and a hydraulic unit; an electronic control unit (ECU) (164) for data processing, positioned in connection with the said control valve (167), wherein said ECU (164) actuates the said control valve (167); and a control panel (165), is directly linked to communicate with the said ECU (164) , Wherein said ECU (164) receives inputs from the control panel (165), wherein said control panel (165) is provided with a user interface structure for laser land leveler control and three point linkage hitch control.
In the preferred embodiment of the present invention, wherein said laser transmitter (152) is positioned at the reference point on the farm land (153). Wherein said laser transmitter (152) emits the laser signal (154) in a horizontal plane at fixed rotating speed. Wherein said laser transmitter (152) emits the laser signal (154) in a rotating horizontal plane, wherein said angle of rotation ranges from 0° to 360°.
In the preferred embodiment of the present invention, wherein said laser signal (154) is transmitted from the transmitter (152) to the laser receiver (155) positioned on mast unit (158) with clear line of sight without any hindrance or obstacle in its travel path.
In the preferred embodiment of the present invention, wherein said adjustable rod (160) is a vertically extendable rod. Wherein said adjustable rod (160) is telescopically extendable rod. Wherein operating height of the said adjustable rod (160) is regulated via the said electric motor (156).
In the preferred embodiment of the present invention, wherein the height of the said laser receiver (155) is adjusted by varying the vertical height of the adjustable rod (160).
In the preferred embodiment of the present invention, wherein said control valve (167) is a three point hitch system control valve.
In the preferred embodiment of the present invention, wherein said control valve (167) is actuated by means of the signal received from the Electronic control unit (164). Wherein said control valve (167) operates the scrapper bucket (161) at the desired height and position in accordance with the processed control signals received from the ECU (164). Wherein height of the scrapper bucket (161) is controlled by controlling the hydraulic fluid flow into and from the hydraulic single acting cylinder (162).
In the preferred embodiment of the present invention, wherein said control panel (165) is a unified control panel for hitch control system and laser land leveling system. Wherein said control panel (165) enables the operator to provide inputs. As shown in Fig. 3, the said control panel (165) is provided with, a user interface (1) for mode selection, wherein said mode is selected from lift, stop and/or control mode; a user interface (2) for enabling/disabling laser land leveling mode; a user interface (3) for manual override selection; a plurality of user interface (1 -7) for three point linkage control, wherein said plurality of user interface (1-7) for three point linkage control is activated when the land leveling operation is disabled.
In an embodiment of the present invention, method of operation of the land leveller implement controlled via an integrated hitch control system (151), comprises steps of :
a) pre-calibrating the electronic control unit (164) with desired uniform leveling height of the farm land (153), wherein said uniform reference height is the mean point of laser receiver (155) vertical reception zone, wherein said reference height is adjusted by adjusting the vertical height of the laser receiver(155) through varying the adjustable rod (160) height;
b) transmitting the laser signals (154) from the laser transmitter (152), wherein said laser signals (154) are emitting in the form of a laser beam;
c) receiving/sensing the transmitted laser signals (154) by the laser receiver (155), wherein said laser receiver (155) is mounted on the mast unit (158) wherein height of the said laser receiver (155) is adjusted by varying the vertical height of the adjustable rod (160) ;
d) transmitting the received signals to the electronic control unit (164), wherein said signals are transmitted by the laser receiver in the form of data to the electronic control unit (164);
e) processing of the received data by the electronic control unit (164), wherein said data is processed with respect to the pre-calibrated reference height for uniform leveling of the farm land;
f) actuating the hydraulic cylinder (162) based on the resulting processed data signal received from the electronic control unit (164), wherein said actuation of hydraulic cylinder (162) via the control valve (167) maintains the scrapper bucket (161) at a desired height, wherein said desired height of the scrapper bucket is calculated based on the laser signal received by the laser receiver (155) and the pre-calibrated reference height ;
g) controlling the scrapper bucket (161) at the desired height in accordance with the control valve (167) actuation by means of the said hydraulic cylinder (162), wherein said scrapper bucket (161) is controlled by controlling the hydraulic fluid flow in the hydraulic cylinder (162); and
h) leveling the farm land uniformly at the desired height level by means of controlling the scrapper bucket (161).
In the preferred embodiment of the present invention, wherein said laser transmitter (152) emits the laser signal (154) in a horizontal plane. wherein said laser transmitter (152) emits the laser signal in a rotating horizontal plane at fixed speed, wherein said angle of rotation ranges from 0° to 360°.
In the preferred embodiment of the present invention, wherein said laser signal (154) is transmitted from the laser transmitter (152) to the laser receiver (155) positioned on the mast unit (158) with clear line of sight without any hindrance or obstacle in its travel path.
In the preferred embodiment of the present invention, wherein said control valve (167) is a three point hitch linkage control valve.
In the preferred embodiment of the present invention, wherein said hydraulic cylinder (162) is a single acting cylinder. wherein height of the scrapper bucket (161) is controlled by controlling the hydraulic fluid flow into and from the hydraulic single acting cylinder.
In the preferred embodiment of the present invention, wherein said mode of operation of the land leveller implement is selected from automatic, and/or manual.
EXAMPLE 1
In automatic laser land leveler mode, the electronic control unit (164) is pre-calibrating with a desired uniform leveling of the farm land, this reference height is the mean point of the laser receiver (155) vertical reception zone. The laser signals (154) are transmitted from laser transmitter (152) positioned on the farm land (153), said laser signals (154) are emitting in the form of a rotating laser beam. The laser receiver (155) mounted on the mast unit (158) senses the transmitted laser signals. The laser receiver senses the laser strike point and sends this strike position information to the electronic control unit (164). The electronic control unit (164) processes this data and actuates the control valve (167) to maintain the scrapper bucket (161) at desired height with reference to the laser beam striking point on the laser receiver and reference height, wherein said scrapper bucket (161) is operated by the said hydraulic single acting cylinder. The scrapper bucket (161) height is controlled by providing/draining hydraulic flow in hydraulic single acting cylinder. In automatic laser land leveling mode, the electronic control unit (164) actuates the tractor three point linkage hitch system control valve to maintain the laser strike point on laser receiver at center from its overall vertical reception zone. In automatic control mode, the manual override switch is used to override the automatic control of scrapper bucket at desired height. The scrapper bucket starts lifting when the manual override switch is pressed and resume to automatic control function of maintaining the scrapper bucket at desired height once the manual override switch actuation is released. This feature is given for reducing the tractor load by lifting the scrapper bucket. The automatic control function of land levelling resumes once if the operator releases the switch.
EXAMPLE 2
In manual mode, the control valve (167) is operated by pressing the mode switch (1) for lifting, stopping and/or control mode/Lowering the scrapper bucket. This lifting and lowering is performed by manually observing the grade status in the laser receiver (155).
It will be apparent to a person skilled in the art that the above description is for illustrative purposes only and should not be considered as limiting. Various modifications, additions, alterations, and improvements without deviating from the spirit and the scope of the invention may be made by a person skilled in the art.