A combined crank-connecting rod mechanism that outputs precise sinusoidal motion

Abstract

The present invention discloses a combined crank-connecting rod mechanism for outputting precise sinusoidal motion law, comprising a first crank-connecting rod mechanism (1), a second crank-connecting rod mechanism (2), a rocking connecting rod (5), a precise output rod (8) and a fixed installation mechanism (13); the first output shaft (3) and one end of the rocking connecting rod (5) are connected via a first sliding connection structure (6); the second output shaft (4) and the other end of the rocking connecting rod (5) are connected and installed via a second sliding connection structure (12); the middle of the rocking connecting rod (5) is connected and installed with the precise output rod (8) via a rotating connection structure (10); the precise output rod (8) is slidably installed and connected to a third linear guide rail (9); the present invention has the beneficial effects of: through the two crank-connecting rod structures, it is possible to output precise sinusoidal motion law, and the present invention is suitable for low-frequency vibration test benches, machine tool reciprocating motion mechanisms, engineering machinery, transportation vehicles, and industrial and mining machinery.

Description

Technical Field

[0001] The invention belongs to the technical field of crank-connecting rod mechanisms, and in particular relates to a combined crank-connecting rod mechanism that outputs precise sinusoidal motion laws. Background Art

[0002] Generally, the motion law of the output end of the crank-connecting rod mechanism is the first curve, and the second curve generated by the swing of the connecting rod is superimposed on the sine curve 22 to output the first curve. However, in some occasions, a more accurate sine curve is required. When the crank-connecting rod mechanism is used to realize reciprocating motion, the motion law is required to be a sine law with higher accuracy, but the curve accuracy is not enough. Therefore, a double crank connection mechanism is proposed to obtain a more accurate sine curve. Summary of the invention

[0003] In view of the above-mentioned deficiencies, the present invention provides a combined crank-connecting rod mechanism that outputs precise sinusoidal motion laws. Through two crank-connecting rod structures, it is possible to output precise sinusoidal motion laws. The mechanism is suitable for low-frequency vibration test benches, machine tool reciprocating motion mechanisms, engineering machinery, transportation vehicles, industrial and mining machinery, and has a wide range of applications and strong practicality.

[0004] The present invention is achieved through the following technical solutions: a combined crank-connecting rod mechanism that outputs precise sinusoidal motion, comprising a first crank-connecting rod mechanism, a second crank-connecting rod mechanism, a rocking connecting rod, a precise output rod and a fixed installation mechanism, wherein the first crank-connecting rod mechanism is provided with a first output shaft, the first output shaft and one end of the rocking connecting rod are connected by a first sliding connection structure, the second crank-connecting rod mechanism is provided with a second output shaft, the second output shaft and the other end of the rocking connecting rod are connected and installed by a second sliding connection structure, the middle of the rocking connecting rod is connected and installed with the precise output rod by a rotating connection structure, the precise output rod is slidably installed and connected to a third linear guide rail, and the first crank-connecting rod mechanism, the second crank-connecting rod mechanism and the third linear guide rail are installed on the fixed installation mechanism.

[0005] As a preferred technical solution of the present invention, the length dimension of the rocking connecting rod between the first sliding connection structure and the rotating connection structure is a first length, and the length dimension of the rocking connecting rod between the rotating connection structure and the second sliding connection structure is a second length, the first length and the second length are equal, and the length range of the first length and the second length is 15mm-3000mm.

[0006] As a preferred technical solution of the present invention, the first crank-connecting rod mechanism also includes a first crank, a first connecting rod, a first crank rotating shaft, and a first linear bearing; the second crank-connecting rod mechanism also includes a second crank, a second connecting rod, a second crank rotating shaft, and a second linear bearing; one end of the first crank and the second crank respectively rotate around the first crank rotating shaft and the second crank rotating shaft; the other ends of the first crank and the second crank are respectively hinged to the first connecting rod and the second connecting rod; the other ends of the first connecting rod and the second connecting rod are respectively hinged to the first output shaft and the second output shaft; the first output shaft and the second output shaft are respectively coaxially connected to install the first linear bearing and the second linear bearing.

[0007] As a preferred technical solution of the present invention, the rotating connection structure includes a mounting hole, a connecting shaft and a connecting bearing. The mounting hole is arranged on the rocking connecting rod, one end of the connecting shaft is fixedly connected to one end of the precision output rod, and the other end of the connecting shaft is arranged in the mounting hole through a connecting bearing.

[0008] As a preferred technical solution of the present invention, the first sliding connection structure and the second sliding connection mechanism each include two sliding bearings, and the two ends of the rocking connection rod are respectively arranged between the two sliding bearings of the first sliding connection structure and the second sliding connection mechanism.

[0009] As a preferred technical solution of the present invention, the plane angle formed by the projections of the first crank rotation axis and the second crank rotation axis has a range of 0°-150°.

[0010] As a preferred technical solution of the present invention, a first transmission wheel is coaxially mounted on one end of the first crank rotating shaft, a second transmission wheel is coaxially mounted on one end of the second crank rotating shaft, and a transmission part is installed between the second transmission wheel and the first transmission wheel.

[0011] As a preferred technical solution of the present invention, the other end of the first crank rotating shaft is connected to a motor and a reducer.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the phases of the first crank-crank connecting rod mechanism and the second crank connecting rod mechanism are shifted by half a circle, that is, when the first crank-crank connecting rod mechanism and the second crank-crank connecting rod mechanism move outward, the second crank-crank connecting rod mechanism and the first crank-crank connecting rod mechanism move inward, and the first crank-crank connecting rod mechanism and the second crank-crank connecting rod mechanism are relatively installed to realize the inversion of the third curve into the fourth curve, and the average value of the first curve and the fourth curve is a sine curve, and the average effect of the first curve and the second curve is realized by swinging the connecting rod. Through the two crank-connecting rod structures, the output of accurate sinusoidal motion law can be realized, which is suitable for low-frequency vibration test benches, machine tool reciprocating motion mechanisms, engineering machinery, transportation tools, industrial and mining machinery, and has a wide range of applications and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 It is a structural schematic diagram of the first crank-connecting rod mechanism and the first crank-connecting rod mechanism in the present invention;

[0015] Figure 3 It is a structural schematic diagram of the first sliding connection structure and the second sliding connection mechanism in the present invention;

[0016] Figure 4 is a schematic diagram of the plane angle between the first crank rotation axis and the second crank rotation axis in the present invention;

[0017] Figure 5 The structure of the first crank shaft and the second crank shaft in the present invention is schematically shown. Figure 1 ;

[0018] Figure 6 The structure of the first crank shaft and the second crank shaft in the present invention is schematically shown. Figure 2 .

[0019] List of reference numerals: 1. first crank-connecting rod mechanism; 2. second crank-connecting rod mechanism; 3. first output shaft; 4. second output shaft; 5. swing connecting rod; 6. first sliding connection structure; 7. first length; 8. precision output rod; 9. third linear guide; 10. rotating connection structure; 11. second length; 12. second sliding connection structure; 13. fixed installation mechanism; 14. first crank; 15. first connecting rod; 16. first linear bearing; 17. second linear bearing; 18. first crank rotating shaft; 19. mounting hole; 20. connecting bearing; 21. connecting shaft; 27. sliding bearing; 28. second crank rotating shaft; 29. ​​second transmission wheel; 30. transmission part; 31. first transmission wheel; 31. first transmission wheel; 32. motor; 33. reducer; 34. second crank; 35. second connecting rod; 36. plane angle. DETAILED DESCRIPTION

[0020] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] like Figure 1The combined crank-connecting rod mechanism for outputting precise sinusoidal motion is characterized in that it comprises a first crank-connecting rod mechanism 1, a second crank-connecting rod mechanism 2, a rocking connecting rod 5, a precise output rod 8 and a fixed mounting mechanism 13; the first crank-connecting rod mechanism 1 is provided with a first output shaft 3, the first output shaft 3 and one end of the rocking connecting rod 5 are connected by a first sliding connection structure 6; the second crank-connecting rod mechanism 2 is provided with a second output shaft 4, the second output shaft 4 and the other end of the rocking connecting rod 5 are connected and installed by a second sliding connection structure 12; the middle of the rocking connecting rod 5 is connected and installed with the precise output rod 8 by a rotating connection structure 10, the precise output rod 8 is slidably installed and connected to a third linear guide rail 9; the first crank-connecting rod mechanism 1, the second crank-connecting rod mechanism 2 and the third linear guide rail 9 are installed on the fixed mounting mechanism 13.

[0022] In order to obtain a sinusoidal curve, the phases of the first crank-connecting rod mechanism 1 and the second crank-connecting rod mechanism 2 are shifted by half a circle, and the output motion law of one of the crank-connecting rod mechanisms is the third curve, that is, when the first crank-connecting rod mechanism and the second crank-connecting rod mechanism move outward, the second crank-connecting rod mechanism and the first crank-connecting rod mechanism move inward, and the first crank-connecting rod mechanism 1 and the second crank-connecting rod mechanism 2 are relatively installed to achieve the inversion of the third curve into the fourth curve, then the average value of the first curve and the fourth curve is a sinusoidal curve, and the average effect of the first curve and the second curve is achieved by swinging the connecting rod 5. Through two crank-connecting rod structures, it is possible to achieve the output of accurate sinusoidal motion law.

[0023] As an embodiment of the present invention, the length dimension of the swing connecting rod 5 between the first sliding connection structure 6 and the rotating connection structure 10 is a first length 7, and the length dimension of the swing connecting rod 5 between the rotating connection structure 10 and the second sliding connection structure 12 is a second length 11, the first length 7 and the second length 11 are equal, and the length range of the first length 7 and the second length 11 is 15mm-3000mm.

[0024] As an embodiment of the present invention, Figure 2As shown, the first crank-connecting rod mechanism 1 also includes a first crank 14, a first connecting rod 15, a first crank rotating shaft 18, and a first linear bearing 16. The second crank-connecting rod mechanism 2 also includes a second crank 34, a second connecting rod 35, a second crank rotating shaft 28, and a second linear bearing 17. One end of the first crank 14 and the second crank 34 rotate around the first crank rotating shaft 18 and the second crank rotating shaft 28 respectively, and the other ends of the first crank 14 and the second crank 34 are respectively hinged to the first connecting rod 15 and the second connecting rod 35. The other ends of the first connecting rod 15 and the second connecting rod 35 are respectively hinged to the first output shaft 3 and the second output shaft 4. The first output shaft 3 and the second output shaft 4 are respectively coaxially connected to install the first linear bearing 16 and the second linear bearing 17.

[0025] As an embodiment of the present invention, Figure 3 As shown, the rotating connection structure 10 includes a mounting hole 19, a connecting shaft 21 and a connecting bearing 20. The mounting hole 19 is arranged on the rocking connecting rod 5, one end of the connecting shaft is fixedly connected to one end of the precision output rod 8, and the other end of the connecting shaft 21 is arranged in the mounting hole 19 through the connecting shaft 20 bearing.

[0026] As an embodiment of the present invention, Figure 4 As shown, the first sliding connection structure 6 and the second sliding connection structure 12 each include two sliding bearings 27 , and the two ends of the rocking connection rod are respectively arranged between the two sliding bearings of the first sliding connection structure 6 and the second sliding connection structure 12 .

[0027] As an embodiment of the present invention, Figure 5 As shown, the plane angle 36 formed by the projections of the first crank rotation axis 18 and the second crank rotation axis 28 is in the range of 0°-150°.

[0028] As an embodiment of the present invention, Figure 6 As shown, a first transmission wheel 31 is coaxially mounted on one end of the first crank rotating shaft 18 , a second transmission wheel 29 is coaxially mounted on one end of the second crank rotating shaft 28 , and a transmission part 30 is mounted between the second transmission wheel 29 and the first transmission wheel 31 .

[0029] As an embodiment of the present invention, the other end of the first crank shaft 18 is connected to a motor 32 and a reducer 33. The motor provides power to drive the first crank shaft 18 to rotate, and then the transmission parts are used to drive the second crank shaft 28 to rotate.

[0030] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A combined crank-connecting rod mechanism that outputs precise sinusoidal motion, characterized in that: The invention comprises a first crank-connecting rod mechanism (1), a second crank-connecting rod mechanism (2), a swing connecting rod (5), a precision output rod (8) and a fixed installation mechanism (13), wherein the first crank-connecting rod mechanism (1) is provided with a first output shaft (3), the first output shaft (3) and one end of the swing connecting rod (5) are connected via a first sliding connection structure (6), the second crank-connecting rod mechanism (2) is provided with a second output shaft (4), the second output shaft (4) and the other end of the swing connecting rod (5) are connected and installed via a second sliding connection structure (12), the middle of the swing connecting rod (5) is connected and installed with the precision output rod (8) via a rotating connection structure (10), the precision output rod (8) is slidably installed and connected to a third linear guide rail (9), and the first crank-connecting rod mechanism (1), the second crank-connecting rod mechanism (2) and the third linear guide rail (9) are installed on the fixed installation mechanism (13); The first crank-connecting rod mechanism (1) further comprises a first crank (14), a first connecting rod (15), a first crank rotating shaft (18), and a first linear bearing (16); the second crank-connecting rod mechanism (2) further comprises a second crank (34), a second connecting rod (35), a second crank rotating shaft (28), and a second linear bearing (17); one end of the first crank (14) and the second crank (34) rotate around the first crank rotating shaft (18) and the second crank rotating shaft (28) respectively; the other ends of the first crank (14) and the second crank (34) are respectively hinged to the first connecting rod (15) and the second connecting rod (35); the other ends of the first connecting rod (15) and the second connecting rod (35) are respectively hinged to the first output shaft (3) and the second output shaft (4); the first output shaft (3) and the second output shaft (4) are respectively coaxially connected to the first linear bearing (16) and the second linear bearing (17).

2. The combined crank-connecting rod mechanism according to claim 1, which outputs precise sinusoidal motion, is characterized in that: The length dimension of the swing connecting rod (5) between the first sliding connection structure (6) and the rotating connection structure (10) is a first length (7), and the length dimension of the swing connecting rod (5) between the rotating connection structure (10) and the second sliding connection structure (12) is a second length (11). The first length (7) and the second length (11) are equal, and the length range of the first length (7) and the second length (11) is 15 mm-3000 mm.

3. The combined crank-connecting rod mechanism for outputting precise sinusoidal motion according to claim 1, characterized in that: The rotary connection structure (10) comprises a mounting hole (19), a connecting shaft (21) and a connecting bearing (20); the mounting hole (19) is arranged on the swing connecting rod (5); one end of the connecting shaft is fixedly connected to one end of the precision output rod (8); and the other end of the connecting shaft (21) is arranged in the mounting hole (19) via a connecting shaft (20) bearing.

4. The combined crank-connecting rod mechanism for outputting precise sinusoidal motion according to claim 1, characterized in that: The first sliding connection structure (6) and the second sliding connection structure (12) each comprise two sliding bearings (27), and the two ends of the rocking connection rod are respectively arranged between the two sliding bearings of the first sliding connection structure (6) and the second sliding connection structure (12).

5. The combined crank-connecting rod mechanism for outputting precise sinusoidal motion according to claim 1, characterized in that: A plane angle (29) formed by projections of the first crank rotation axis (18) and the second crank rotation axis (28), wherein the plane angle (29) ranges from 0° to 150°.

6. The combined crank-connecting rod mechanism for outputting precise sinusoidal motion according to claim 1, characterized in that: A first transmission wheel (31) is coaxially mounted on one end of the first crank rotating shaft (18), a second transmission wheel (29) is coaxially mounted on one end of the second crank rotating shaft (28), and a transmission part (30) is mounted between the second transmission wheel (29) and the first transmission wheel (31).

7. The combined crank-connecting rod mechanism for outputting precise sinusoidal motion according to claim 6, characterized in that: The other end of the first crank shaft is connected to a motor (32) and a reducer (33).

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