A land grader

Abstract

The present invention discloses a land leveler, which includes a land leveler, a connecting frame, an upper bracket, a lower bracket, an upper and lower bracket connecting assembly, a height adjustment driving mechanism and a horizontal adjustment mechanism. The upper bracket can be connected to the connecting frame in an up-and-down rotational manner, the upper end of the upper and lower bracket connecting assembly is connected to the upper bracket in an up-and-down rotational manner, the lower end of the upper and lower bracket connecting assembly can be connected to the lower bracket in an up-and-down rotational manner, the lower bracket can be connected to the connecting frame in an up-and-down rotational manner and in an left-and-right rotational manner, the connecting frame, the upper bracket, the lower bracket and the upper and lower bracket connecting assembly are connected to form a first parallelogram, the height adjustment driving mechanism is used to drive the upper bracket to rotate up and down relative to the connecting frame, the land leveler is arranged at the lower side of the rear end of the lower bracket, and the horizontal adjustment mechanism is used to drive the lower bracket to rotate left and right relative to the upper bracket. The present invention can adjust the height and levelness of the land leveler during the land leveling process, so that the ground flatness formed after the operation is completed is good.

Description

Technical Field

[0001] The invention relates to a motor grader. Background Art

[0002] Graders are used to level paddy fields. Since the hard bottom layer of paddy fields is uneven, the wheel depth of the tractor used to drive the grader is inconsistent, causing the height of the grader blade suspended on the tractor relative to the paddy field tillage layer to change, making it easy for the grader blade to be in an uneven state with one end higher than the other.

[0003] Chinese patent CN103583101A discloses a land leveling blade elevation adjustment mechanism of a paddy field laser land leveler, comprising: a land leveling blade, a land leveling blade rotating frame, a suspension mounting frame, a synchronous parallel rod, a synchronous motion frame, an elevation cylinder bracket, an elevation cylinder and a receiver mounting rod. The suspension mounting frame, the land leveling blade rotating frame, the synchronous motion frame and the synchronous parallel rod constitute a parallelogram mechanism.

[0004] The invention adjusts the height of the leveling blade by controlling the deformation of the parallelogram mechanism, but cannot adjust the horizontality of the leveling blade. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a land leveler which can adjust both the height and the level of the land leveling blade.

[0006] In order to solve the above technical problems, the present invention includes a leveling shovel, a connecting frame, an upper bracket, a lower bracket, an upper and lower bracket connecting assembly, a height adjustment drive mechanism and a horizontal adjustment mechanism. The upper bracket and the connecting frame can be connected to each other in an up-and-down manner. The upper end of the upper and lower bracket connecting assembly is connected to the upper bracket in an up-and-down manner. The lower end of the upper and lower bracket connecting assembly is connected to the lower bracket in an up-and-down manner. The lower bracket and the connecting frame can be connected to each other in an up-and-down manner. The connecting frame, the upper bracket, the lower bracket and the upper and lower bracket connecting assembly are connected to form a first parallelogram. The height adjustment drive mechanism is used to drive the upper bracket to rotate up and down relative to the connecting frame. The leveling shovel is arranged on the lower side of the rear end of the lower bracket. The horizontal adjustment mechanism is used to drive the lower bracket to rotate left and right relative to the upper bracket.

[0007] To facilitate assembly, the middle part of the front end of the lower bracket is connected to the connecting frame through a first universal joint, the lower end of the upper and lower bracket connecting assembly is connected to the lower bracket through a second universal joint, and the front end of the upper bracket is rotatably connected to the connecting frame through a pin shaft.

[0008] For the convenience of control, the height adjustment driving mechanism is an upper bracket lifting cylinder, and the two ends of the upper bracket lifting cylinder are respectively hingedly connected to the connecting frame and the upper bracket.

[0009] In order to facilitate the adjustment of the horizontality of the leveling shovel, the horizontal adjustment mechanism includes two crank arms and two upper and lower bracket adjustment rods, the corners of the two crank arms are hinged to the left and right sides of the upper bracket respectively, and one end of each crank arm is hinged to the left and right sides of the lower bracket through the upper and lower bracket adjustment rods respectively, and the connection points between the two crank arms, the two upper and lower bracket adjustment rods and the lower bracket form a second parallelogram, the other ends of the two crank arms are connected through left and right balancing rods, the two crank arms are hinged to the left and right balancing rods, and the connection points between the two crank arms, the left and right balancing rods and the upper bracket form a third parallelogram, and a crank arm driving mechanism is connected between one of the crank arms and the upper bracket to drive the crank arm to rotate relative to the upper bracket.

[0010] In order to facilitate the control of the rotation of the crank arm, the crank arm driving mechanism is a lower bracket swing driving cylinder or an electric push rod, and the two ends of the crank arm driving mechanism are respectively hinged to the crank arm and the upper bracket.

[0011] In order to facilitate installation, a support is fixed on the upper bracket, and the crank arm driving mechanism is hingedly connected to the support.

[0012] In order to facilitate the adjustment of the horizontality of the leveling shovel, the horizontal adjustment mechanism includes two crank arms and two upper and lower bracket adjustment rods, the corners of the two crank arms are hinged on the left and right sides of the upper bracket respectively, and one end of each crank arm is hinged to the left and right sides of the lower bracket through the upper and lower bracket adjustment rods respectively, and the connection points between the two crank arms, the two upper and lower bracket adjustment rods and the lower bracket form a second parallelogram, and the other ends of the two crank arms are connected through the double-extension rod lower bracket swing drive cylinder, and the two crank arms are hinged to the two ends of the double-extension rod lower bracket swing drive cylinder respectively, and the connection points between the two crank arms, the double-extension rod lower bracket swing drive cylinder and the upper bracket form a third parallelogram, and the cylinder body of the double-extension rod lower bracket swing drive cylinder is connected to the upper bracket up and down in a sliding manner through a connecting seat.

[0013] In order to achieve automatic height adjustment, a height detector is provided on the upper bracket, the height detector is connected to a controller, and a height adjustment drive mechanism is connected to the controller. The controller is used to control the action of the height adjustment drive mechanism according to a detection signal from the height detector.

[0014] In order to achieve automatic adjustment of the horizontality, a level detector is provided on the lower bracket, the level detector is connected to the controller, the level adjustment mechanism is connected to the controller, and the controller is used to control the action of the level adjustment mechanism according to the detection signal of the level detector.

[0015] In order to facilitate installation on a tractor, the connecting frame is a three-point suspension frame.

[0016] The beneficial effects of the present invention are as follows: the present invention designs the lower bracket for carrying the leveling shovel into a structure that can rotate up and down and left and right, so that the lower bracket can swing up and down and left and right, and the height of the leveling shovel can be adjusted by controlling the up and down rotation of the lower bracket, and the levelness of the leveling shovel can be adjusted by controlling the left and right rotation of the lower bracket. The present invention can adjust the height and levelness of the leveling shovel during the leveling process, so that the ground formed after the operation is completed has good flatness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the main structure of Example 1 of the present invention;

[0018] Figure 2 is a schematic diagram of the top view of the structure of Example 1 of the present invention (the horizontal adjustment mechanism is not shown);

[0019] Figure 3 is a schematic diagram of the rear view structure of Example 1 of the present invention;

[0020] Figure 4 is a rear view structural schematic diagram of Example 2 of the present invention;

[0021] In the figure: 1. three-point suspension frame, 2. front swing support point of lower bracket, 3. rear swing support point of lower bracket, 4. lower bracket, 5. upper bracket, 6. level detector, 7. height detector, 8. upper and lower bracket connecting assembly, 9. leveling shovel, 10. front end mounting seat of upper bracket, 11. front end mounting seat of lower bracket, 12. rear end fixing seat of upper bracket, 13. rear end fixing seat of lower bracket, 14. connecting seat, 15. left and right balancing connecting rods, 16. lower bracket swing drive cylinder or electric push rod, 17. double extension rod lower bracket swing drive cylinder, 18. crank arm, 19. upper and lower bracket adjustment rod, 20. upper bracket lifting cylinder. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1 , Figure 2 and Figure 3The grader shown includes a grader 9, a connecting frame, an upper bracket 5, a lower bracket 4, an upper and lower bracket connecting assembly 8, a height adjustment drive mechanism and a horizontal adjustment mechanism. The connecting frame adopts a three-point suspension frame 1, and an upper bracket front end mounting seat 10 and a lower bracket front end mounting seat 11 are fixed on the connecting frame. The upper bracket 5 is connected to the upper bracket front end mounting seat 10 by a pin shaft and can be rotated up and down. An upper bracket rear end fixing seat 12 is fixed to the rear end of the upper bracket 5. The upper end of the upper and lower bracket connecting assembly 8 is connected to the upper bracket rear end fixing seat 12 and can be rotated up and down. A lower bracket rear end fixing seat 13 is fixed to the rear end of the lower bracket 4. The lower end of the upper and lower bracket connecting assembly 8 can be connected to the lower bracket rear end fixing seat 13 and can be rotated up and down and left and right. The connecting assembly 8 and the rear end fixing seat 13 of the lower bracket are connected through the second universal joint to form the rear swing support point 3 of the lower bracket. The lower bracket 4 and the front end mounting seat 11 of the lower bracket can be rotated up and down and left and right through the first universal joint to form the front swing support point 2 of the lower bracket. The connecting frame, the upper bracket 5, the lower bracket 4 and the upper and lower bracket connecting assembly 8 are connected to form a first parallelogram. The height adjustment drive mechanism is used to drive the upper bracket 5 to rotate up and down relative to the connecting frame. The height adjustment drive mechanism is the upper bracket lifting cylinder 20. The two ends of the upper bracket lifting cylinder 20 are respectively hinged to connect the connecting frame and the upper bracket 5. The leveling shovel 9 is arranged on the lower side of the rear end of the lower bracket 4. The horizontal adjustment mechanism is used to drive the lower bracket 4 to rotate left and right relative to the upper bracket 5. The deformation of the first parallelogram is controlled by the extension and contraction of the upper bracket lifting cylinder 20, thereby controlling the height of the leveling shovel. The connecting frame can also adopt other forms as long as the upper bracket 5, the lower bracket 4 and the upper bracket lifting cylinder 20 can be installed.

[0025] The horizontal adjustment mechanism includes two crank arms 18 and two upper and lower bracket adjustment rods 19. The corners of the two crank arms 18 are respectively hinged to the left and right sides of the upper bracket 5. One end of each of the two crank arms 18 is respectively hinged to the left and right sides of the lower bracket 4 through the upper and lower bracket adjustment rods 19. The connection points between the two crank arms 18, the two upper and lower bracket adjustment rods 19 and the lower bracket 4 form a second parallelogram. The other ends of the two crank arms 18 are connected through the double-extended rod lower bracket swing drive cylinder 17. The two crank arms 18 are respectively hinged to the two ends of the double-extended rod lower bracket swing drive cylinder 17. The connection points between the two crank arms 18, the double-extended rod lower bracket swing drive cylinder 17 and the upper bracket 5 form a third parallelogram. The cylinder body of the double-extended rod lower bracket swing drive cylinder 17 is connected to the upper bracket 5 by sliding up and down through the connecting seat 14. The double-extended rod lower bracket swing drive cylinder 17 is a cylinder with piston rods fixed on both sides of the piston and two piston rods extending from both ends of the cylinder body. In the present invention, other cylinders use cylinders with only one piston rod. Two U-shaped slide grooves are provided on the connecting seat 14, and a clamping shaft is fixed on each side of the cylinder body of the double-extended rod lower bracket swing driving cylinder 17. The cylinder body is inserted into the connecting seat 14, and the two clamping shafts slide up and down respectively and are clamped in the two slide grooves, so that the cylinder body can only slide up and down in the connecting seat 14 but cannot move left and right.

[0026] This specific embodiment also includes a controller, a height detector 7 and a level detector 6. The height detector 7 is arranged on the upper bracket 5, and the level detector 6 is arranged on the lower bracket 4. The upper bracket lifting cylinder 20, the double-extended rod lower bracket swing driving cylinder 17, the height detector 7 and the level detector 6 are connected to the controller. The controller is used to control the upper bracket lifting cylinder 20 according to the detection signal of the height detector 7 and to control the double-extended rod lower bracket swing driving cylinder 17 according to the detection signal of the level detector 6. The double-extended rod lower bracket swing driving cylinder 17 can control the lower bracket 4 to swing left and right around the lower bracket front swing support point 2 and the lower bracket rear swing support point 3. The controller, the height detector 7 and the level detector 6 all use existing electrical components.

[0027] Working principle: first determine a reference height. When the height detected by the height detector 7 is greater than the reference height, the controller controls the upper bracket lifting cylinder 20 to contract, so that the rear end of the upper bracket 5 rotates downward, and drives the lower bracket 4 and the leveling shovel 9 to rotate downward together, so that the height of the leveling shovel 9 is adjusted downward, until the height detected by the height detector 7 reaches the reference height. When the height detected by the height detector 7 is less than the reference height, the controller controls the upper bracket lifting cylinder 20 to extend, so that the rear end of the upper bracket 5 rotates upward, and drives the lower bracket 4 and the leveling shovel 9 to rotate upward together, so that the height of the leveling shovel 9 is adjusted upward, until the height detected by the height detector 7 reaches the reference height. When the level detector 6 detects that the left side is too high, the controller controls the piston rod of the double-extended lower bracket swing drive cylinder 17 to move to the left, so that the left crank arm pushes the left upper and lower bracket adjustment rod 19 downward, and at the same time, the right crank arm pushes the right upper and lower bracket adjustment rod 19 upward, so that the lower bracket 4 rotates downward on the left side and upward on the right side until the level detector 6 detects that it is horizontal. When the level detector 6 detects that the right side is too high, the controller controls the piston rod of the double-extend rod lower bracket swing driving cylinder 17 to move to the right, so that the left crank arm pushes the left upper and lower bracket adjustment rod 19 to move up, and at the same time, the right crank arm pushes the right upper and lower bracket adjustment rod 19 to move down, so that the left side of the lower bracket 4 rotates upward and the right side downward until the level detector 6 detects that it is horizontal.

[0028] Example 2

[0029] like Figure 4As shown, the difference between this specific example and Example 1 is that the structure of the horizontal adjustment mechanism is different. The horizontal adjustment mechanism of this specific embodiment includes two crank arms 18 and two upper and lower bracket adjustment rods 19, the corners of the two crank arms 18 are respectively hinged to the left and right sides of the upper bracket 5, and one end of each of the two crank arms is respectively hinged to the left and right sides of the lower bracket 4 through the upper and lower bracket adjustment rods 19, and the connection points between the two crank arms 18, the two upper and lower bracket adjustment rods 19 and the lower bracket 4 form a second parallelogram, and the other ends of the two crank arms 18 are connected through the left and right balance links 15, and the two crank arms 18 are hinged to the left and right balance links 15, and the connection points between the two crank arms 18, the left and right balance links 15 and the upper bracket 5 form a third parallelogram, and a lower bracket swing driving cylinder or electric push rod 16 that drives the crank arm 18 to rotate relative to the upper bracket 5 is connected between one of the crank arms 18 and the upper bracket 5, and a support is fixed on the upper bracket 5, and the two ends of the lower bracket swing driving cylinder or electric push rod 16 are respectively hinged to the crank arm 18 and the support. This specific embodiment controls the levelness of the left and right sides of the leveling blade 9 by controlling the action of the lower bracket swing drive cylinder or the electric push rod 16. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0030] In this patent, the orientation is described with the connecting frame as the front, the upper and lower bracket connecting components as the rear, the front and rear facades on both sides in the horizontal direction as the left and right, the upper bracket as the upper, and the lower bracket as the bottom. Up and down rotation refers to rotation around the axis extending in the left and right directions, and left and right rotation refers to rotation around the axis extending in the front and rear directions.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

Claims

1. A motor grader, characterized in that: The invention comprises a leveling shovel, a connecting frame, an upper bracket, a lower bracket, an upper and lower bracket connecting assembly, a height adjustment driving mechanism and a horizontal adjustment mechanism. The upper bracket and the connecting frame can be connected to each other in an upward and downward rotation manner. The upper end of the upper and lower bracket connecting assembly is connected to the upper bracket in an upward and downward rotation manner. The lower end of the upper and lower bracket connecting assembly can be connected to the lower bracket in an upward and downward rotation manner. The lower bracket and the connecting frame can be connected to each other in an upward and downward rotation manner. The connecting frame, the upper bracket, the lower bracket and the upper and lower bracket connecting assembly are connected to form a first parallelogram. The height adjustment driving mechanism is used to drive the upper bracket to rotate up and down relative to the connecting frame. The leveling shovel is arranged on the lower side of the rear end of the lower bracket. The horizontal adjustment mechanism is used to drive the lower bracket to rotate left and right relative to the upper bracket. The horizontal adjustment mechanism comprises two crank arms and two upper and lower The bracket adjustment rod, the corners of the two crank arms are hinged on the left and right sides of the upper bracket respectively, and one end of the two crank arms is hinged to the left and right sides of the lower bracket through the upper and lower bracket adjustment rods respectively. The connection points between the two crank arms, the two upper and lower bracket adjustment rods and the lower bracket form a second parallelogram, and the other ends of the two crank arms are connected through left and right balancing links. The two crank arms are hinged to the left and right balancing links, and the connection points between the two crank arms, the left and right balancing links and the upper bracket form a third parallelogram, and a crank arm driving mechanism for driving the crank arm to rotate relative to the upper bracket is connected between one of the crank arms and the upper bracket; the middle part of the front end of the lower bracket is connected to the connecting frame through a first universal joint, the lower end of the upper and lower bracket connecting assembly is connected to the lower bracket through a second universal joint, and the front end of the upper bracket is rotatably connected to the connecting frame through a pin shaft.

2. The motor grader according to claim 1, characterized in that: The height adjustment driving mechanism is an upper bracket lifting cylinder, and the two ends of the upper bracket lifting cylinder are respectively hingedly connected to the connecting frame and the upper bracket.

3. The motor grader according to claim 1, characterized in that: The crank arm driving mechanism is a lower bracket swing driving oil cylinder or an electric push rod, and the two ends of the crank arm driving mechanism are respectively hinged to the crank arm and the upper bracket.

4. The motor grader according to claim 3, characterized in that: A support is fixed on the upper bracket, and the crank arm driving mechanism is hingedly connected to the support.

5. The motor grader according to any one of claims 1 to 4, characterized in that: The upper bracket is provided with a height detector, the height detector is connected to a controller, the height adjustment drive mechanism is connected to the controller, and the controller is used to control the action of the height adjustment drive mechanism according to a detection signal of the height detector.

6. The motor grader according to claim 5, characterized in that: The lower bracket is provided with a level detector, the level detector is connected to a controller, the level adjustment mechanism is connected to the controller, and the controller is used to control the action of the level adjustment mechanism according to a detection signal of the level detector.

7. The motor grader according to any one of claims 1 to 4, characterized in that: The connecting frame is a three-point suspension frame.

8. A motor grader, characterized in that: The shovel is arranged on the lower side of the rear end of the lower bracket, and the horizontal adjustment mechanism is used to drive the lower bracket to rotate left and right relative to the upper bracket; the horizontal adjustment mechanism includes two crank arms and two upper and lower bracket adjustment rods, and two upper and lower bracket adjustment rods are provided. The corners of the crank arms are hinged on the left and right sides of the upper bracket respectively, and one end of each of the two crank arms is hinged to the left and right sides of the lower bracket through the upper and lower bracket adjustment rods respectively, and the connection points between the two crank arms, the two upper and lower bracket adjustment rods and the lower bracket form a second parallelogram, and the other ends of the two crank arms are connected through the double-extension rod lower bracket swing driving cylinder, and the two crank arms are hinged to the two ends of the double-extension rod lower bracket swing driving cylinder respectively, and the connection points between the two crank arms, the double-extension rod lower bracket swing driving cylinder and the upper bracket form a third parallelogram, and the cylinder body of the double-extension rod lower bracket swing driving cylinder is connected to the upper bracket up and down through a connecting seat; the middle part of the front end of the lower bracket is connected to the connecting frame through a first universal joint, the lower end of the upper and lower bracket connecting assembly is connected to the lower bracket through a second universal joint, and the front end of the upper bracket is rotatably connected to the connecting frame through a pin shaft.

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