Position design method for pull pin lock hole of swing frame of land leveler

Abstract

The invention discloses a land leveler swing frame pull pin lock hole position design method, and belongs to the technical field of swing frame design, the design method is based on a swing frame mechanism, and the swing frame mechanism comprises a left swing arm, a right swing arm, a lower swing rod, a rear suspension body and a fixed seat; the fixing seat is fixed to one end of the rear suspension body, the two sides of the fixing seat are hinged to the right swing arm and the left swing arm respectively, the two ends of the lower swing rod are hinged to the ends, away from the fixing frame, of the right swing arm and the left swing arm respectively, a plurality of lock holes are formed in the lower swing rod, and a mechanical pin pulling mechanism used for being matched with the lock holes is arranged on the rear suspension body. By establishing a global plane rectangular coordinate system and a motion coordinate system moving along with the lower swing rod, the position of the lock hole after moving along with the right swing arm and the left swing arm is solved. The lock hole position can be rapidly determined according to the scraper knife angle needed by a client, the design method is convenient and practical, the design result is accurate, the design method can be better suitable for the production and preparation situation of a small number of flat bottom machines with variable lock hole positions, and multi-angle work of the scraper knife is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of swing frame design, and in particular to a method for designing the position of a pin lock hole of a swing frame of a grader. Background Art

[0002] A motor grader is a multifunctional engineering machine with a blade as its main working device. The blade of a motor grader can perform operations such as cutting, scraping and leveling the soil. It can also perform operations such as trenching and slope trimming by adjusting the angle between the blade and the ground. The swing frame device of a motor grader is a proprietary device that connects the front frame of the motor grader with the working device. The working posture of the working device is changed by changing the spatial position of the swing frame device and the compound movement of the cylinder assembly.

[0003] The swing frame device of the motor grader generally has two structural forms: an integral type and a connecting rod type. Both structures realize locking of different blade postures by inserting a locking pin into different pin holes. In the swing frame device of the motor grader in the prior art, when the locking pin is separated from the pin hole, the polygon formed by the connecting rod mechanism consisting of the left swing arm, the right swing arm and the lower swing rod is deformed through the combined action of two lifting cylinders and one inclined pull cylinder, so that the lower swing rod with the pin hole moves, so that the target pin hole moves to a position aligned with the locking pin, and then the locking pin extends into the locking hole to realize locking of the blade posture.

[0004] The existing methods for designing and determining the positions of multiple lock holes on the lower swing rod mostly use a pre-installed blade, and after deflecting the blade according to the required angle, the lock hole position is determined by punching a sample according to the position of the lock pin on the lower swing rod at this time; or use software to build a model of the swing frame and the working device, simulate the position of the lock pin on the lower swing rod after the blade is deflected, and then determine the lock hole position. The above method is mostly applicable to the production and preparation of batches of graders with fixed lock hole positions. For the production and preparation of a small number of graders with variable lock hole positions, the above method is time-consuming and labor-intensive, and has poor practicality. Therefore, there is an urgent need for a simple and efficient method to determine the lock hole position according to the required deflection angle of the blade. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for designing the position of the lock hole of the pull pin of the grader swing frame, which can quickly determine the position of the lock hole according to the blade angle required by the customer. The design method is convenient and practical, and the design result is relatively accurate. It can be better applied to the production and preparation of a small number of graders with variable lock hole positions, thereby realizing multi-angle operation of the blade.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a method for designing the position of a pin-pulling lock hole of a grader swing frame, the design method is based on a swing frame mechanism, the swing frame mechanism comprises a left swing arm, a right swing arm, a lower swing rod, a rear suspension and a fixing seat; the fixing seat is fixed to one end of the rear suspension, the two sides of the fixing seat are respectively hinged to the right swing arm and the left swing arm, the two ends of the lower swing rod are respectively hinged to one end of the right swing arm and the left swing arm away from the fixing frame, the left swing arm and the right swing arm are fixed with forks, and the shovel blade is connected to the swing frame mechanism through the forks; a plurality of lock holes are opened on the lower swing rod, and a mechanical pin-pulling mechanism for cooperating with the lock holes is provided on the rear suspension;

[0007] The two hinge points where the two sides of the fixing seat are hinged with the right swing arm and the left swing arm are respectively set as A 1 and A 2 ; Point A 1 and point A 2 The midpoint of the line between is set as point O; point A 1 To point A 2 The distance is set to 2L 1 The two ends of the lower swing rod are respectively connected to the right swing arm and the left swing arm at two hinge points, respectively set as B 1 and B 2 , point B 1 and point B 2 The midpoint of the connection is set as point C; point A 1 To point B 1 The distance is set to L 2 , ∠OA 1 B 1 The supplementary angle of point B is set to α. 1 To B 2 The distance is set to L 3 When the lower swing rod is in a horizontal state, the position of the lower swing rod in this state is assumed to be the initial position, and the mechanical pin pulling mechanism is installed in the middle of the initial position of the lower swing rod;

[0008] The method for designing and determining the position of the keyhole comprises the following steps:

[0009] Step 1: Take point O as the center of the coordinate circle. The direction is the positive direction of the X axis. The direction is the positive direction of the Y axis, and a global plane rectangular coordinate system is established;

[0010] Step 2: Take point C as the coordinate origin. The direction is the positive direction of the X axis, and the initial position The direction is the positive direction of the Y axis, and the motion coordinate system that moves with the swing rod is established:

[0011] Step 3: Let the deflection angle of the right swing arm be β, and get point B 1 The coordinates after deflection by angle β;

[0012] Step 4: In the global plane rectangular coordinate system, take A 2 is the center of the circle, L 2 Build the first circle equation for the radius;

[0013] Step 5: In the global plane rectangular coordinate system, 1 is the center of the circle, L 3 Build the second circle equation for the radius;

[0014] Step 6: Solve the two circle equations in steps 1 and 2 to get point B. 2 The coordinates of

[0015] Step 7: According to point B obtained in step 2 The coordinates of the straight line A 2 B 2 The slope k of , and the coordinates of point C;

[0016] Step 8: The rotation mode of the moving coordinate system relative to the global plane rectangular coordinate system can be obtained according to the slope k, and the translation mode of the moving coordinate system relative to the global plane rectangular coordinate system can be obtained according to the coordinates of point C;

[0017] Step 9: Find the line B after the right swing arm is deflected 1 B 2 Find the point with the horizontal coordinate of on the global plane rectangular coordinate system and set it as point D;

[0018] Step 10: According to the rotation and translation of the motion coordinate system relative to the global plane rectangular coordinate system obtained in the step, the rotated straight line B 1 B 2 As the X-axis of the relative coordinate system, the rotated point C is used as the origin of the relative coordinate system, and then the coordinates of point D in the relative coordinate system are obtained, that is, the position where the hole needs to be punched on the lower swing rod relative to the middle hole is obtained.

[0019] Furthermore, grooves are provided at both ends of the lower swing rod, and one end of the left swing arm, the right swing arm, and the lower swing rod hingedly connected are both located in the grooves.

[0020] Beneficial effects of the present invention:

[0021] The position design method of the lock hole of the pull pin of the leveler swing frame of the present invention can quickly determine the position of the lock hole according to the blade angle requirements required by the customer. The design method is convenient and practical, and the design result is relatively accurate. The result error is within a controllable 1% range. It can be better applied to the production and preparation of a small number of levelers with variable lock hole positions, and realize multi-angle operation of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of the swing frame of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the lower swing rod in the present invention.

[0024] Figure 3 It is a mathematical model diagram of the swing frame in the present invention.

[0025] In the figure: 1, rear suspension; 2, fixed seat; 3, right swing arm; 4, left swing arm; 5, lower swing rod; 51, groove; 6, fork. DETAILED DESCRIPTION

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0027] The invention discloses a method for designing the position of a pin-pulling lock hole of a swing frame of a grader.

[0028] Reference Figure 1 and Figure 2 A method for designing the position of the pin-pulling lock hole of the swing frame of a grader is provided. The method is based on the swing frame mechanism. The swing frame mechanism includes a left swing arm 4, a right swing arm 3, a lower swing rod 5, a rear suspension 1 and a fixed seat 2. The fixed seat 2 is fixed to one end of the rear suspension 1. Both sides of the fixed seat 2 are respectively hinged to the right swing arm 3 and the left swing arm 4. Both ends of the lower swing rod 5 are respectively hinged to the right swing arm 3 and the left swing arm 4 away from the fixed frame. A fork 6 is fixed on the left swing arm 4 and the right swing arm 3. The blade is connected to the swing frame mechanism through the fork 6. Several lock holes are provided on the lower swing rod 5. A mechanical pin-pulling mechanism for cooperating with the lock holes is provided on the rear suspension 1. Grooves 51 are provided at the left and right ends of the lower swing rod 5 to facilitate the assembly of the left swing arm 4 and the right swing arm 3, and at the same time, space is left for the assembly of the mechanical pin-pulling mechanism, which effectively utilizes the number of holes, simplifies the structure of the lower swing rod 5, and improves the stability of the lower swing rod 5.

[0029] Reference Figure 3 The method for designing the position of the lock hole of the swing frame pin includes the following steps:

[0030] The two hinge points on the fixed seat 2 that are hinged to the right swing arm 3 and the left swing arm 4 are respectively set as A 1 and A 2 ; Point A 1 and point A 2 The midpoint of the line between is set as point O; point A 1 To point A 2 The distance is set to 2L 1 ;

[0031] The two hinge points on the lower swing rod 5 that are hinged to the right swing arm 3 and the left swing arm 4 are respectively set as B 1 and B2 , point B 1 and point B 2 The midpoint of the connection is set as point C; point A 1 To point B 1 The distance is set to L 2 , ∠OA 1 B 1 The supplementary angle of point B is set to α. 1 To B 2 The distance is set to L 3 , then L 3 =2L 2 cos α +2L 1 .

[0032] When the working state of the shovel blade is parallel to the ground, that is, when the lower swing arm 5 is in a horizontal state, the position of the lower swing arm 5 in this state is assumed to be the initial position, and the mechanical pin pulling mechanism is installed in the middle of the initial position of the lower swing arm 5, and the first lock hole is punched in the middle of the lower swing arm 5. Based on the initial position, when designing different shovel blade angle working conditions, the rotation angles of the left swing arm 4 and the right swing arm 3 are designed, and the lock hole position on the lower swing arm 5 is designed according to the rotation angle.

[0033] Since the swing frame is a symmetrical structure, only rod A is discussed in this embodiment. 1 B 1 In the case of clockwise deflection at the initial position, the counterclockwise deflection case is the mirror image of the clockwise result.

[0034] The specific keyhole position design method is as follows:

[0035] Step 1: Take point O as the center of the coordinate circle. The direction is the positive direction of the X axis. The direction is the positive direction of the Y axis, and a global plane rectangular coordinate system is established;

[0036] Step 2: Take point C as the coordinate origin. The direction is the positive direction of the X axis, and the initial position The direction is the positive direction of the Y axis, and a motion coordinate system moving with the lower swing rod 5 is established:

[0037] Step 3: Let the deflection angle of the right swing arm 3 be β, and get point B 1 The coordinates after deflection by angle β;

[0038] (X B1 ,Y B1 )=(L 1 +L 2 cos(α-β),L 2 sin(α-β));

[0039] Step 4: In the global plane rectangular coordinate system, take A 2 is the center of the circle, L 2 Build the first circle equation for the radius;

[0040] (X+L 1 ) 2 +Y 2 =L 2 2 ;

[0041] Step 5: In the global plane rectangular coordinate system, 1 is the center of the circle, L 3 Build the second circle equation for the radius;

[0042] (XL 1 -L 2 cos(α-β) 2 +(YL 2 sin(α-β) 2 =L 3 2 ;

[0043] Step 6: Solve the two circle equations in steps 4 and 5 and use the resulting set of solutions as point B. 2 The coordinates (X B2 ,Y B2 );

[0044] Step 7: Based on point B obtained in step 6 2 The coordinates of the straight line A 2 B 2 The slope k of point C can be obtained.

[0045] Step 8: The rotation mode of the moving coordinate system relative to the global plane rectangular coordinate system can be obtained according to the slope k, and the translation mode of the moving coordinate system relative to the global plane rectangular coordinate system can be obtained according to the coordinates of point C;

[0046] Step 9: Find the straight line B after the right swing arm 3 is deflected 1 B 2 On the global plane rectangular coordinate system, the point with a horizontal coordinate of 0 is set as point D. The coordinates of point D are: (X D ,Y D )=(0,Y D );

[0047] Step 10: According to the rotation and translation of the motion coordinate system relative to the global plane rectangular coordinate system obtained in step 8, the rotated straight line B 1 B 2As the X-axis of the relative coordinate system, the rotated point C is used as the origin of the relative coordinate system, and then the coordinates of point D in the relative coordinate system (X D1 ,Y D1 ), that is, the position on the lower swing rod 5 that needs to be punched relative to the middle lock hole is obtained, and the source end design of the lock hole position is realized.

[0048] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for designing the position of the lock hole of the pull pin of the grader swing frame. Features: The design method is based on a swing frame mechanism, wherein the swing frame mechanism comprises a left swing arm (4), a right swing arm (3), a lower swing rod (5), a rear suspension (1) and a fixing seat (2); the fixing seat (2) is fixed to one end of the rear suspension (1), the two sides of the fixing seat (2) are respectively hinged to the right swing arm (3) and the left swing arm (4), the two ends of the lower swing rod (5) are respectively hinged to the ends of the right swing arm (3) and the left swing arm (4) away from the fixing frame, the left swing arm (4) and the right swing arm (3) are fixed with forks (6), and the shovel is connected to the swing frame mechanism through the forks (6); a plurality of lock holes are opened on the lower swing rod (5), and a mechanical pin pulling mechanism for cooperating with the lock holes is provided on the rear suspension (1); The two hinge points on both sides of the fixing seat (2) and the right swing arm (3) and the left swing arm (4) are respectively set as A 1 and A 2 ; Point A 1 and point A 2 The midpoint of the line between is set as point O; point A 1 To point A 2 The distance is set to 2L 1 The two ends of the lower swing rod (5) are respectively hinged to the right swing arm (3) and the left swing arm (4) at two hinge points, which are respectively set as B 1 and B 2 , point B 1 and point B 2 The midpoint of the connection is set as point C; point A 1 To point B 1 The distance is set to L 2 , ∠OA 1 B 1 The supplementary angle of point B is set to α. 1 To B 2 The distance is set to L 3 When the lower swing rod (5) is in a horizontal state, the position of the lower swing rod (5) in this state is assumed to be the initial position, and the mechanical pin pulling mechanism is installed in the middle of the initial position of the lower swing rod (5); The method for designing and determining the position of the keyhole comprises the following steps: Step 1: Take point O as the center of the coordinate circle. The direction is the positive direction of the X axis. The direction is the positive direction of the Y axis, and a global plane rectangular coordinate system is established; Step 2: Take point C as the coordinate origin. The direction is the positive direction of the X axis, and the initial position The direction is the positive direction of the Y axis, and the motion coordinate system moving with the swing rod (5) is established: Step 3: Let the deflection angle of the right swing arm (3) be β, and get point B 1 The coordinates after deflection by angle β; Step 4: In the global plane rectangular coordinate system, take A 2 is the center of the circle, L 2 Build the first circle equation for the radius; Step 5: In the global plane rectangular coordinate system, 1 is the center of the circle, L 3 Build the second circle equation for the radius; Step 6: Solve the two circle equations in steps 4 and 5 to get point B 2 The coordinates of Step 7: Based on point B obtained in step 6 2 The coordinates of the straight line A 2 B 2 The slope k of , and the coordinates of point C; Step 8: The rotation mode of the motion coordinate system relative to the global plane rectangular coordinate system can be obtained according to the slope k, and the translation mode of the motion coordinate system relative to the global plane rectangular coordinate system can be obtained according to the coordinates of point C; Step 9: Find the line B after the right swing arm (3) is deflected. 1 B 2 A point with a horizontal coordinate of 0 on the global plane rectangular coordinate system is set as point D; Step 10: According to the rotation and translation of the motion coordinate system relative to the global plane rectangular coordinate system obtained in step 8, the rotated straight line B 1 B 2 As the X-axis of the relative coordinate system, the rotated point C is used as the origin of the relative coordinate system, and then the coordinates of point D in the relative coordinate system are obtained, that is, the position of the lower swing rod (5) relative to the middle hole to be punched is obtained.

2. A method for designing the position of a lock hole for a swing frame of a motor grader according to claim 1, Features: Grooves (51) are provided at both ends of the lower swing rod (5), and one end of the left swing arm (4) and the right swing arm (3) hinged to the lower swing rod (5) is located in the groove (51).

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