Full-hydraulic self-propelled mowing and windrower controlled by positive and negative screw rods

Abstract

The invention belongs to the technical field of mowing and windrowers, and provides a full-hydraulic self-propelled mowing and windrower controlled by positive and negative screw rods, comprising: a body in which a walking control assembly is mounted; the walking control assembly comprises a full-hydraulic steering gear box, a main hydraulic pump, a hydraulic motor, a positive and negative screw rod, a left moving assembly, a left hydraulic pump, a right moving assembly and a right hydraulic pump, the hydraulic motor is controlled by the full-hydraulic steering gear box through the main hydraulic pump, and the positive and negative screw rod is mounted at an output shaft of the hydraulic motor; the left moving assembly and the right moving assembly are symmetrically arranged relative to the positive and negative screw rod and are in control connection with the left hydraulic pump and the right hydraulic pump respectively; according to the invention, by adopting a mechanical and electro-hydraulic control mode, the dependence on complex and expensive electronic elements is reduced, so that the manufacturing cost is greatly reduced; and when faults occur, common agricultural machinery maintenance personnel can check and repair most faults, so that the maintenance cost is greatly reduced, and the downtime is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of mowing and sun-drying machines, in particular to a full hydraulic self-propelled mowing and sun-drying machine controlled by forward and reverse screw rods. Background Art

[0002] With the continuous advancement of large-scale and intensive agricultural operations, higher and higher requirements are placed on the efficiency, performance and degree of automation of agricultural machinery. As an important link in agricultural production, mowing and drying operations have a direct impact on the subsequent processing and storage of agricultural products. The control system of the fully hydraulic self-propelled mower and sun-dryer uses electronic components such as computer boards, sensors, solenoid valves or electro-hydraulic proportional valves to accurately control the flow of the hydraulic pump through positive and negative screw rods, thereby achieving precise control of the travel of the mower and sun-dryer. The advantage is that the control accuracy is high, and the travel parameters can be accurately adjusted according to different operation requirements. The operation is easy and the operator can easily achieve complex travel movements by operating the travel hand steering wheel.

[0003] The existing self-propelled mower and windrow control system is expensive. Once a failure occurs, it requires professional electronic technicians to use specialized testing equipment and maintenance tools to repair it. It is difficult for ordinary agricultural machinery maintenance personnel to handle it. This has affected the equipment's reliability and timeliness of maintenance to a certain extent, and increased users' usage costs and downtime.

[0004] Therefore, those skilled in the art have proposed a fully hydraulic self-propelled lawn mower controlled by a forward and reverse screw rod to solve the problems raised by the background art. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a fully hydraulic self-propelled mower and windrower controlled by forward and reverse screw rods to solve the problems of high cost of control systems of self-propelled mower and windrowers in the prior art and difficulty for ordinary agricultural machinery maintenance personnel to handle faults.

[0006] A fully hydraulic self-propelled grass cutting and sun drying machine controlled by forward and reverse screw rods, comprising: a machine body, wherein a travel control component is installed in the machine body;

[0007] The travel control component includes a full hydraulic steering machine, a main hydraulic pump, a hydraulic motor, a forward and reverse screw rod, a left shift component, a left hydraulic pump, a right shift component and a right hydraulic pump. The full hydraulic steering machine controls the hydraulic motor through the main hydraulic pump, and the forward and reverse screw rod is installed at the output shaft of the hydraulic motor; the left shift component and the right shift component are symmetrically arranged about the forward and reverse screw rod, and the left shift component and the right shift component are respectively controlled and connected to the left hydraulic pump and the right hydraulic pump.

[0008] Preferably, the right shift assembly includes a cylindrical screw sleeve, a positioning screw, a connecting frame and a control handle; the cylindrical screw sleeve is threadedly engaged with the circumference of the positive and negative screw rods, a connecting frame is fixedly installed on the upper surface of the cylindrical screw sleeve, a control handle is installed on the connecting frame, the control handle connecting end is connected to the right hydraulic pump control end, a left hydraulic motor and a right hydraulic motor are installed in the body, and the right hydraulic pump is connected to the right hydraulic motor oil pipe.

[0009] Preferably, the left-shift assembly and the right-shift assembly have the same structure and are symmetrically arranged, the control handle connecting end of the left-shift assembly is connected to the control end of the left hydraulic pump, and the left hydraulic pump is connected to the left hydraulic motor oil pipe.

[0010] Preferably, a positioning screw is installed between the connecting frame and the cylindrical nut sleeve.

[0011] Preferably, the left hydraulic motor is connected to the left driving wheel of the machine body, and the right hydraulic motor is connected to the right driving wheel of the machine body.

[0012] Preferably, two sets of universal wheels are installed at the rear of the machine body frame.

[0013] Preferably, the left hydraulic pump and the right hydraulic pump are both servo bidirectional closed plunger variable displacement pumps.

[0014] Preferably, electric push rods are installed at the ends of the positive and negative screw rods.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention reduces the reliance on complex and expensive electronic components by adopting a forward and reverse screw control method; the hydraulic pump is controlled by a simple mechanical structure such as a full hydraulic steering machine, a hydraulic motor, and a forward and reverse screw, and its structure is relatively simple, and the difficulty of the manufacturing process is reduced, thereby greatly reducing the manufacturing cost; and when a fault occurs, ordinary agricultural machinery maintenance personnel can use their basic maintenance skills for mechanical structures and hydraulic systems and conventional tools to troubleshoot and repair most faults. There is no need to rely on professional electronic technicians and specialized electronic testing equipment like program electronic control equipment, which greatly reduces maintenance costs and reduces downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the walking control assembly of the present invention;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the positive and negative screw rods.

[0020] In the figure:

[0021] 10. Machine body; 11. Travel control assembly; 12. Universal wheel; 1. Full hydraulic steering machine; 2. Main hydraulic pump; 3. Hydraulic motor; 4. Forward and reverse screws; 501. Left hydraulic pump; 502. Left hydraulic motor; 601. Right hydraulic pump; 602. Right hydraulic motor; 7. Left shift assembly; 8. Right shift assembly; 801. Cylindrical screw sleeve; 802. Positioning screw; 803. Connecting frame; 804. Control handle; 9. Electric push rod. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0023] Embodiment 1: As shown in the attached Figure 1 To Attachment Figure 3 As shown: The present invention provides a fully hydraulic self-propelled grass cutting and drying machine controlled by a forward and reverse screw rod, comprising a machine body 10 and a travel control assembly 11;

[0024] A walking control assembly 11 is installed in the machine body 10;

[0025] The travel control component 11 includes a full hydraulic steering machine 1, a main hydraulic pump 2, a hydraulic motor 3, a forward and reverse screw rod 4, a left shift component 7, a left hydraulic pump 501, a right shift component 8 and a right hydraulic pump 601. The full hydraulic steering machine 1 controls the hydraulic motor 3 through the main hydraulic pump 2, and the forward and reverse screw rod 4 is installed at the output shaft of the hydraulic motor 3; the left shift component 7 and the right shift component 8 are symmetrically arranged about the forward and reverse screw rod 4, and the left shift component 7 and the right shift component 8 are respectively controlled and connected to the left hydraulic pump 501 and the right hydraulic pump 601.

[0026] The right shift component 8 includes a cylindrical screw sleeve 801, a positioning screw 802, a connecting frame 803 and a control handle 804; the cylindrical screw sleeve 801 is threadedly matched with the 4 sides of the forward and reverse screw rods, the connecting frame 803 is fixedly installed on the upper surface of the cylindrical screw sleeve 801, the positioning screw 802 is installed between the connecting frame 803 and the cylindrical screw sleeve 801, the connecting frame 803 is installed with a control handle 804, the connecting end of the control handle 804 is connected to the control end of the right hydraulic pump 601, the left hydraulic motor 502 and the right hydraulic motor 602 are installed in the body 10, and the right hydraulic pump 601 is connected to the right hydraulic motor 602 oil pipe; the left hydraulic pump 501 and the right hydraulic pump 601 both adopt servo bidirectional closed plunger variable pumps, the left hydraulic motor 502 and the right hydraulic motor 602 are both travel motors, and use plunger motors.

[0027] The left shift assembly 7 and the right shift assembly 8 have the same structure and are symmetrically arranged. The control handle connection end of the left shift assembly 7 is connected to the control end of the left hydraulic pump 501, and the left hydraulic pump 501 is connected to the oil pipe of the left hydraulic motor 502.

[0028] The left hydraulic motor 502 is connected to the left driving wheel of the machine body 10 and the left travel reducer, the right hydraulic motor 602 is connected to the right driving wheel of the machine body 10 and the right travel reducer, and two sets of universal wheels 12 are installed at the rear of the frame of the machine body 10.

[0029] An electric push rod 9 is installed at the end of the forward and reverse screw rod 4; the forward and reverse screw rod 4 can also be pulled by pulling a wire or a shift fork.

[0030] A displacement control valve is installed between the control handle 804 and the right hydraulic pump 601 , and a closed-loop hydraulic system is used between the left hydraulic pump 501 , the right hydraulic pump 601 and the left hydraulic motor 502 and the right hydraulic motor 602 .

[0031] When the stepless travel handle in the machine body 10 is in the middle position and the full hydraulic steering machine 1 is controlled to rotate left, the rotation signal of the full hydraulic steering machine 1 is processed by the main hydraulic pump 2 and the hydraulic motor 3 is controlled to start rotating left.

[0032] The rotation of the hydraulic motor 3 drives the forward and reverse screw rods 4 to rotate, and the threads on the forward and reverse screw rods 4 cooperate with the cylindrical screw sleeves 801 on the left and right sides; due to the rotation of the screw rod, the cylindrical screw sleeve 801 on the left side will move to the left along the screw rod, and the cylindrical screw sleeve 801 on the right side will move to the right; the cylindrical screw sleeve 801 is connected to the hydraulic pump control handle through the connecting frame 803, so the left movement of the left cylindrical screw sleeve 801 will drive the control handle of the left hydraulic pump 501 to move to the left, and at the same time, the right movement of the right cylindrical screw sleeve 801 will drive the control handle of the right hydraulic pump 601 to move to the right;

[0033] When the control handle of the left hydraulic pump 501 moves to the left, its displacement control valve moves accordingly, so that the left hydraulic pump 501A port discharges high-pressure oil to the left hydraulic motor 502, and the left hydraulic motor 502 starts to rotate to the left; at the same time, the control handle of the right hydraulic pump 601 moves to the right, oil is discharged from the right hydraulic pump 601B port, and the right hydraulic motor 602 starts to rotate to the right.

[0034] Under the action of the hydraulic pump and the travel motor, the left driving wheel rotates backward due to the left rotation of the left hydraulic motor 502, and the right driving wheel rotates forward due to the right rotation of the right hydraulic motor 602. Such rotation in different directions enables the universal wheel 12 at the rear of the machine body 10 to rotate 360 ​​degrees to the left along with the driving wheel, thereby realizing the 360-degree leftward rotation of the windrower.

[0035] When the stepless handle is in the middle position, the full hydraulic steering machine 1 is controlled to rotate rightward, which is similar to the principle of the above-mentioned leftward rotation, but the direction of action is opposite; at this time, the rotation signal of the full hydraulic steering machine 1 is processed by the main hydraulic pump, and the hydraulic motor 3 will rotate rightward accordingly, and the motor rotation direction is opposite to that of the full hydraulic steering machine, thereby driving the forward and reverse screw rods 4 to rotate, so that the left cylindrical screw sleeve 801 moves to the right and the right cylindrical screw sleeve 801 moves to the left. This will cause the left hydraulic pump 501 to control the handle to move right, and the right hydraulic pump 601 to control the handle to move left, so that the left hydraulic pump 501B port discharges oil, the left hydraulic motor 502 rotates to the right, and the right driving wheel rotates backward; the right hydraulic pump 601A port discharges oil, the right hydraulic motor 602 rotates to the left, and the left driving wheel rotates forward; finally, the universal wheel 12 at the back rotates 360 degrees to the right with the driving wheel, realizing a 360-degree circle to the right.

[0036] Embodiment 2: When the full hydraulic steering machine 1 is in the middle position and the stepless handle walking handle moves forward, the stepless handle outputs a servo signal, which controls the extension and retraction of the electric push rod 9 through the computer board, pulling the bidirectional screw rod 4 or moving the whole to the right through the pull wire. Since the bidirectional screw rod 4 and the hydraulic motor 3 are telescopically connected, the bidirectional screw rod 4 has a rotation function and can adapt to the extension and retraction of the electric push rod 9 or the pull wire.

[0037] The action of the electric push rod 9 pushes the two sets of control handles 804 to move to the right at the same time, which causes the two oil pumps to discharge oil from port B at the same time; according to the working principle of the hydraulic pump, at this time, the left hydraulic motor 502 and the right hydraulic motor 602 will both rotate to the right, thereby driving the two drive wheels to rotate forward at the same time, realizing the forward movement of the windrower.

[0038] When the full hydraulic steering machine 1 is in the middle position and the stepless handle moves backward, the signal output by the stepless handle is processed by the computer board to control the electric push rod 9 or the pull wire to work in the reverse direction, pushing the control handle 804 to move left, causing the two oil pumps to change the oil outlet state, thereby causing the two drive wheels to rotate backward, realizing the backward movement of the windrower.

[0039] When the stepless travel handle is in the forward position, the full hydraulic steering machine 1 rotates to the left. In the above linkage process, the forward and reverse screws 4 drive the left hydraulic pump 501 control handle to move to the left and the right hydraulic pump 601 control handle to move to the right. For the left hydraulic pump 501, the left movement of the control handle will cause its B port flow rate to decrease. According to the relationship between the hydraulic pump displacement and flow rate and the speed formula of the hydraulic motor, the motor speed is proportional to the hydraulic pump flow rate, and the speed of the left hydraulic motor 502 decreases; while the right movement of the right hydraulic pump 601 control handle increases the oil volume at its B port, and the speed of the right hydraulic motor 602 increases.

[0040] In this way, the speed of the driving wheel on the left side becomes slower and the speed of the driving wheel on the right side becomes faster, thereby realizing the left turning of the windrower.

[0041] Similarly, when the steering wheel is turned right, the speed of the right hydraulic motor 602 slows down and the speed of the left hydraulic motor 502 speeds up, thus achieving rightward steering. Through the linkage of the forward and reverse screw rods and the hydraulic pump control handle, the flow of the hydraulic pump is accurately adjusted, thereby controlling the speed of the travel motor, thus achieving precise steering control of the windrower during driving.

[0042] The mower and sundryer adopts a unique forward and reverse screw rod plus electro-hydraulic control method, which successfully solves the problem of accurate control of two pumps. The rotation of the travel motor is controlled by the full hydraulic steering machine, and the motor drives the forward and reverse screw rods 4 to rotate to accurately control the flow of the two hydraulic pumps. Compared with the servo proportional valve plus program control method adopted abroad, the control accuracy is not much different. During the travel of the mower and sundryer, both the stability of straight-line driving and the accuracy of steering can be effectively guaranteed, and it can better adapt to the requirements of path and operation accuracy in complex farmland operation environments. For example, when operating on narrow ridges or irregular plots, it can accurately turn, turn around on the spot, and move forward and backward, thereby reducing misoperation and damage to crops and improving operation quality.

[0043] The operating process is greatly simplified. Various travel actions can be achieved by easily operating the stepless handle and steering gear. For example, during steering operation, the hydraulic pump flow is precisely adjusted through the steering gear and the stepless travel handle, so that the left and right drive wheels can rotate at different speeds, thereby easily completing the steering action without the need to pull the travel handle laboriously like traditional mechanical control methods.

[0044] By controlling the electric push rod or pull wire through the stepless handle, the flow of the two pumps can be increased or decreased at the same time, and the two drive wheels can be accelerated or decelerated at the same time. The operator can flexibly adjust the travel speed of the windrower according to actual operation needs. The operation is light and flexible, which effectively reduces the labor intensity of the operator, improves the operation efficiency, reduces the fatigue caused by long-term operation, and enables the operator to focus more on controlling the operation quality.

[0045] The price of a servo-controlled and program-controlled self-propelled mower and sun-dryer is as high as over 1 million to 2 million. The mechanical and electro-hydraulic control method adopted in this mower and sun-dryer is relatively simple in structure, and uses conventional and low-cost components. The hydraulic pump and motor are both Danfoss agricultural machinery pumps, which are cheap and have a large market share and simple mechanical structures. The manufacturing cost of the whole machine is about 200,000, which lowers the threshold for equipment procurement, is conducive to increasing the market penetration rate of products, and promotes the promotion and application of agricultural mechanization on a wider range.

[0046] Due to the use of relatively simple and mature mechanical and electro-hydraulic control principles, it has relatively fewer failure points compared to complex program electronic control systems. In addition, it is simple. When a failure occurs, it does not require professional electronic technicians and expensive testing equipment for maintenance. Ordinary agricultural machinery maintenance personnel can diagnose and repair most faults with conventional maintenance tools and experience, which greatly reduces the maintenance cost and downtime of the equipment and ensures the continuity of agricultural production.

[0047] The conventional closed-loop hydraulic system used in the present mower and sun-drying machine is mainly composed of hydraulic pumps (left hydraulic pump 501 and right hydraulic pump 601), hydraulic motors (left hydraulic motor 502 and right hydraulic motor 602), pipelines and related control valves and other components; in this closed loop, the hydraulic oil circulates between the pump and the motor to form a relatively closed oil circuit system.

[0048] Take Danfoss' agricultural machinery pump as an example. When the control handle of the hydraulic pump is in different positions, the working state of the internal components such as the swash plate or plunger changes, thereby realizing the oil suction and oil pressure process. For example, when the control handle is moved to the left, the pump's port A will output oil and port B will return oil; when it is moved to the right, port A will return oil and port B will output oil; when in the middle position, neither port A nor port B will output oil. This manual servo control method can accurately adjust the pump's displacement according to the displacement of the control handle, thereby controlling the output hydraulic oil flow and pressure.

[0049] The high-pressure oil output by the hydraulic pump is transported to the hydraulic motor through the pipeline. The rotor inside the hydraulic motor begins to rotate under the action of the high-pressure oil, converting the hydraulic energy into mechanical energy, thereby driving the drive wheel connected to it to rotate, and realizing the walking movement of the windrower. For example, when the left hydraulic pump A port outputs high-pressure oil to the left hydraulic motor, the left hydraulic motor begins to rotate to the left, driving the left drive wheel to move; when the right hydraulic pump B port outputs oil to the right hydraulic motor, the right hydraulic motor rotates to the right, driving the right drive wheel to move. The two work together to achieve different walking states such as turning or straight driving;

[0050] The closed-loop hydraulic system is also equipped with components such as pressure control valves to adjust system pressure and provide overload protection. When the system pressure exceeds the set value, the pressure control valve will open to allow part of the hydraulic oil to flow back to the tank or perform other pressure adjustment operations to prevent the system from damaging components due to excessive pressure. For example, when the windrower encounters greater resistance or overload, the pressure control valve can respond in time to protect components such as the hydraulic pump, motor, and pipelines from damage, while maintaining the basic operating functions of the system to ensure that the windrower operates within a safe range of operating conditions.

[0051] In addition, filters and other components in the system can filter the hydraulic oil, remove impurities, ensure the cleanliness of the hydraulic oil, extend the service life of system components, and further improve the reliability and stability of the closed-loop hydraulic system.

[0052] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present invention.

[0053] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0057] In the drawings of the embodiments disclosed in the present invention, only the structures involved in the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0058] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully hydraulic self-propelled mower and windrower controlled by forward and reverse screws, characterized in that: include: A machine body (10), wherein a walking control component (11) is installed in the machine body (10); A travel control assembly (11), the travel control assembly (11) comprising a full hydraulic steering machine (1), a main hydraulic pump (2), a hydraulic motor (3), a forward and reverse screw rod (4), a left shift assembly (7), a left hydraulic pump (501), a right shift assembly (8) and a right hydraulic pump (601), wherein the full hydraulic steering machine (1) controls the hydraulic motor (3) through the main hydraulic pump (2), and the forward and reverse screw rod (4) is installed at the output shaft of the hydraulic motor (3); the left shift assembly (7) and the right shift assembly (8) are symmetrically arranged with respect to the forward and reverse screw rod (4), and the left shift assembly (7) and the right shift assembly (8) are respectively connected to the left hydraulic pump (501) and the right hydraulic pump (601) for control.

2. A fully hydraulic self-propelled grass cutting and drying machine controlled by forward and reverse screw rods as claimed in claim 1, characterized in that: The right shift assembly (8) comprises a cylindrical screw sleeve (801), a positioning screw (802), a connecting frame (803) and a control handle (804); the cylindrical screw sleeve (801) is threadedly engaged with the circumference of the forward and reverse screw rods (4); the connecting frame (803) is fixedly mounted on the upper surface of the cylindrical screw sleeve (801); the connecting frame (803) is mounted with a control handle (804); the connecting end of the control handle (804) is connected to the control end of the right hydraulic pump (601); a left hydraulic motor (502) and a right hydraulic motor (602) are mounted in the machine body (10); the right hydraulic pump (601) is connected to the oil pipe of the right hydraulic motor (602).

3. A fully hydraulic self-propelled grass cutting and drying machine controlled by forward and reverse screw rods as claimed in claim 2, characterized in that: The left shift assembly (7) and the right shift assembly (8) have the same structure and are symmetrically arranged. The control handle connection end of the left shift assembly (7) is connected to the control end of the left hydraulic pump (501), and the left hydraulic pump (501) is connected to the oil pipe of the left hydraulic motor (502).

4. A fully hydraulic self-propelled grass cutting and drying machine controlled by forward and reverse screw rods as claimed in claim 3, characterized in that: A positioning screw (802) is installed between the connecting frame (803) and the cylindrical nut (801).

5. A fully hydraulic self-propelled grass cutting and drying machine controlled by forward and reverse screw rods as claimed in claim 2 or 4, characterized in that: The left hydraulic motor (502) is connected to the left driving wheel of the machine body (10), and the right hydraulic motor (602) is connected to the right driving wheel of the collective (10).

6. A fully hydraulic self-propelled grass cutting and drying machine controlled by forward and reverse screw rods as claimed in claim 5, characterized in that: Two sets of universal wheels (12) are installed at the rear of the frame of the machine body (10).

7. A fully hydraulic self-propelled grass cutting and drying machine controlled by forward and reverse screw rods as claimed in claim 2, characterized in that: The left hydraulic pump (501) and the right hydraulic pump (601) are both servo bidirectional closed plunger variable displacement pumps.

8. A fully hydraulic self-propelled grass cutting and drying machine controlled by forward and reverse screw rods as claimed in claim 7, characterized in that: An electric push rod (9) is installed at the end of the forward and reverse screw rods (4).

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