CN107421425B - Camshaft symmetry detection device and measurement method thereof - Google Patents
Camshaft symmetry detection device and measurement method thereof Download PDFInfo
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- CN107421425B CN107421425B CN201710708295.1A CN201710708295A CN107421425B CN 107421425 B CN107421425 B CN 107421425B CN 201710708295 A CN201710708295 A CN 201710708295A CN 107421425 B CN107421425 B CN 107421425B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B5/252—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
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Abstract
A camshaft symmetry detection device and a measurement method thereof comprise the following steps: the utility model provides a camshaft symmetry detection device, comprises base, front support subassembly, location clamping mechanism, tailstock subassembly, clamp braking mechanism, auxiliary measurement mechanism and linear guide mechanism, and the main characteristics lies in adopting two top, 180 rotatory three-jaw chuck and graduation piece to fix a position, and auxiliary measurement mechanism can cooperate and detect camshaft diameter axiality, camshaft straightness along the axis direction. The specific measurement method comprises the following steps: according to the length of the cam shaft, a fixed center and a floating center are adopted to prop against central holes at two ends of the cam shaft, the cam shaft clamped by the three-jaw chuck is driven by the rotating main shaft to turn over 180 degrees, and whether the symmetry degree of curves at two sides of the cam shaft is qualified or not is measured. The invention has the advantages of simple and reasonable structure, convenient and visual use, time and labor saving and high measurement accuracy, and greatly reduces the operation difficulty and labor intensity of staff.
Description
Technical Field
The invention relates to a detection device, in particular to a camshaft symmetry detection device.
Background
The camshaft is one of the key transmission components applied to the pneumatic drum brake, and the processing quality of the camshaft is a technical index for determining the service life of the camshaft and the braking efficiency of the pneumatic drum brake. In order to ensure the machining precision of the cam shaft, the symmetry degree of the cam curve of the cam shaft needs to be measured after the machining is finished, and the existing detection method mostly needs manual detection, so that the method is time-consuming, labor-consuming, low in efficiency, poor in reliability and poor in measurement accuracy, and is not suitable for mass production detection.
Disclosure of Invention
The camshaft symmetry detection device and the camshaft symmetry detection method have the advantages of simple and reasonable structure, convenient and visual use, time and labor saving and high measurement accuracy, and the operation difficulty and the labor intensity of staff are greatly reduced.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides a camshaft symmetry detection device, includes base, front support subassembly, location clamping mechanism, tailstock subassembly, clamp braking mechanism, auxiliary measurement mechanism and linear guide mechanism, its characterized in that:
The front support assembly comprises a support, a support rod, a clamping block and a dial indicator, wherein the support is fixed at one end of the linear guide rail mechanism through a bolt, the support rod for fixing the clamping block is arranged in a hole at the upper end of the support in an interference fit manner, the clamping block is provided with an unlocking and locking hole A and a locking hole B, the clamping block is locked on the support rod through the locking hole A, and the dial indicator is locked on the clamping block through the locking hole B;
The positioning and clamping mechanism comprises a 60-degree fixed center, a 60-degree floating center, a three-jaw chuck, a rotating main shaft and an indexing block, wherein the 60-degree fixed center is arranged on a support of a front support assembly in an interference fit manner, the 60-degree floating center is arranged in a central hole of the rotating main shaft and is in clearance fit with the central hole of the rotating main shaft, a compression spring for providing floating jacking force is sleeved at the middle section of the 60-degree floating center, and a nut for preventing and adjusting the floating jacking force is arranged at the tail end of the 60-degree floating center;
The tail seat assembly comprises a shell, a rear cover, a bottom plate, a tapered roller bearing, a round nut and a dust ring, wherein the rotary main shaft is supported in a shell hole through the tapered roller bearing, the round nut for adjusting the pretightening force of the bearing is fixed on the tail section of the rotary main shaft and locked by a locking plate, an indexing block is fixed on the shell through a pin shaft bolt and overturned around the pin shaft bolt, the dust ring is added at the front end of the shell, the shell and the bottom plate are welded together, and a slide block for enabling the bottom plate to move along a linear guide rail mechanism is arranged on the lower plane of the bottom plate;
The clamping and braking mechanism comprises two swing clamping blocks arranged at the tail end of a base plate of the tailstock assembly, a left-handed nut and a right-handed nut which are arranged in the swing clamping blocks and have opposite rotation directions and can swing around a pin shaft, a screw rod with left-handed threads and right-handed threads respectively processed at two ends matched with the left-handed nut and the right-handed nut, and a hand wheel arranged on the screw rod, wherein the hand wheel is rotated, the screw rod drives the swing clamping blocks to clamp a guide rail, and the base plate is fixed;
The auxiliary measuring mechanism comprises an auxiliary gauge stand, a sliding block and a linear guide rail mechanism, wherein the sliding block is arranged below the auxiliary gauge stand, so that the auxiliary gauge stand moves along the linear guide rail mechanism, and other measuring and detecting tools can be placed on the auxiliary gauge stand to detect the shaft diameter coaxiality of the camshaft, the straightness of the camshaft along the axis direction and the like;
The linear guide rail mechanism comprises two sets of linear guide rail mechanisms which are parallelly and parallelly arranged on the base, one set of linear guide rail mechanism is matched with the front support assembly, the positioning and clamping mechanism, the tailstock assembly and the clamping and braking mechanism, the other set of linear guide rail mechanism is matched with the auxiliary gauge stand, the linear guide rail mechanism comprises a guide rail and a stop block, the guide rail is fixed on the base through a bolt, and the stop block for preventing the slide block from sliding out of the guide rail is arranged at the tail of the guide rail.
The invention also relates to a measuring method of the camshaft symmetry detecting device, which comprises the following specific measuring steps:
(1) According to the length of the cam shaft, the bottom plate is slid to a proper position of the guide rail, and a hand wheel of the clamping and braking mechanism is rotated to lock the bottom plate on the guide rail;
(2) The fixed center and the floating center are used for supporting the center holes at two ends of the cam shaft, and the three-jaw chuck clamps the tail section of the cam shaft;
(3) The dial indicator is arranged on the clamping block through the locking hole B;
(4) The indexing block full line forcing is buckled with a hard pin at the front end of the rotary main shaft, and a dial indicator measures the numerical value on the curve of the cam shaft;
(5) Lifting the indexing block, and rotating the main shaft to drive the cam shaft clamped by the three-jaw chuck to turn over 180 degrees;
(6) The index block is buckled down, the index block full line forcing is well buckled with a hard pin at the front end of the rotating main shaft, and a dial indicator measures the numerical value on the curve at the other side of the cam shaft;
(7) Comparing the values to obtain whether the symmetry degree of the curves at the two sides of the cam shaft is qualified;
(8) When needed, a magnetic dial indicator seat is placed on the auxiliary indicator seat, the coaxiality of the shaft diameter of the camshaft relative to the central hole is detected, and the straightness of the cam along the axial direction can be checked;
(9) And loosening the three-jaw chuck, and replacing the other camshaft for further inspection.
The beneficial effects obtained by adopting the technical scheme are as follows: the invention has simple structure and convenient operation, and is suitable for on-site batch detection; the universal performance is high, and various camshafts with different lengths and diameters can be detected; the method can simulate the actual use state and has high detection precision.
Drawings
Fig. 1 is a schematic diagram of the front structure of the present invention.
Fig. 2 is a schematic view of the indexing block lifting structure of the present invention.
Fig. 3 is a schematic cross-sectional view of the present invention.
Fig. 4 is a schematic top view of the present invention.
Fig. 5 is a schematic view of the structure of the clamping brake mechanism of the present invention.
Fig. 6 is a schematic view of the linear guide mechanism of the present invention.
FIG. 7 is a cross-sectional view of the structure of FIG. 5 A-A in accordance with the present invention.
In the figure, 1, a base; 2. a support; 3. a support rod; 4. clamping blocks; 5. a dial indicator; 6. fixing a center; 7. a floating center; 8. a three-jaw chuck; 9. rotating the main shaft; 10. a hard pin; 11. an indexing block; 12. a pin bolt; 13. full line forcing; 14. a handle; 15. a housing; 16. a rear cover; 17. a bottom plate; 18. a slide block; 19. a hand wheel; 20. a slide rail; 21. a cam shaft; 22. a compression spring; 23. tapered roller bearings; 24. a round nut; 25. a dust ring; 26. a locking bolt; 27. a locking hole A; 28. a locking hole B; 29. a stop block; 30. an auxiliary gauge stand; 31. swinging the clamping block; 32. a right-handed nut; 33. a left-handed nut; 34. screw rod, 35, pin shaft.
Detailed Description
The following describes in further detail the positions and connection relationships between the components, the actions and the working principles of the components, and the like according to the embodiments of the present invention with reference to the accompanying drawings:
As shown in the figure, the camshaft symmetry degree detection device comprises a base (1), a front support assembly, a positioning and clamping mechanism, a tailstock assembly, a clamping and braking mechanism, an auxiliary measuring mechanism and a linear guide mechanism, wherein the front support assembly comprises a support (2), a support rod (3), a clamp block (4) and a dial indicator (5), the support (2) is fixed at one end of the linear guide mechanism through bolts, a phi 10 support rod (3) for fixing the clamp block (4) is arranged in an upper end hole of the support (2) in an interference fit manner, a phi 10 locking hole A (27) and a phi 8 locking hole B (28) are machined in the clamp block (4), a notch with the width of 2mm is formed in the clamp block, a clamp block is locked on the phi 10 support rod through the phi 10 locking hole A (27), and the dial indicator (5) is locked in the clamp block phi 8 locking hole B (28) through the locking bolts.
The positioning and clamping mechanism comprises a 60-degree fixed center (6), a 60-degree floating center (7), a three-jaw chuck (8), a rotary main shaft (9) and an indexing block (11), wherein the 60-degree fixed center (6) is arranged on the support (2) in an interference fit manner, the 60-degree floating center (7) is arranged in a central hole of the rotary main shaft (9), and is in clearance fit with the central hole of the rotary main shaft (9), the middle section of the 60-degree floating center (7) is sleeved with a compression spring (22) for providing floating jacking force, the tail end is provided with a nut (24) for preventing falling and adjusting the floating jacking force, a three-jaw chuck (8) for fixedly clamping the tail end of the cam shaft is arranged at the front end of the rotary main shaft (9), the rotating main shaft (9) is driven to integrally rotate along with the rotating main shaft (9), the front end of the rotating main shaft (9) is provided with two horizontal holes, two phi 10 hard pins (10) which are overlapped with the indexing block full line forcing (13) are arranged, the overlapped part of the phi 10 hard pins and the indexing block needs to be carefully matched and ground, in order to improve the precision, in the embodiment, the dividing block full line forcing (13) is thinned to 3mm, and the 60-degree fixed center (6), the 60-degree floating center (7), the three-jaw chuck (8), the rotating main shaft (9), the central shaft of the dividing block (11), and the lap joint of the dividing block full line forcing (13) and the hard pin (10) are all positioned on the same straight line and are parallel to the plane of the linear guide rail mechanism;
The tailstock assembly comprises a shell (15), a rear cover (16), a bottom plate (17), a tapered roller bearing (23), a round nut (24) and a dust ring (25), wherein the rotating main shaft (9) is supported in a hole of the shell (15) through the tapered roller bearing (23), the round nut (24) for adjusting the pretightening force of the bearing is fixed on the tail section of the rotating main shaft (9), the tail section is locked by a locking plate, the dividing block (11) is fixed on the shell (15) through a pin shaft bolt (12), the rotating main shaft is overturned around the pin shaft bolt (12), the dust ring (25) is added at the front end of the shell (15), the shell (15) and the bottom plate (17) are welded together, a sliding block (18) for enabling the bottom plate (17) to move along a linear guide rail mechanism is arranged under the bottom plate (17), and the bottom plate (17) can move to a proper position along the linear guide rail due to the great difference of various cam shafts and is locked by a clamping and braking mechanism;
The clamping and braking mechanism comprises two swinging clamping blocks (31) arranged at the tail end of a tailstock assembly bottom plate (17), a left-handed nut (32) and a right-handed nut (33) which are arranged in the swinging clamping blocks and can swing around a pin shaft in opposite rotation directions, a screw (34) which is matched with the left-handed nut (32) and the right-handed nut (33) and is provided with left-handed threads and right-handed threads respectively, and a hand wheel (19) arranged on the screw, wherein the hand wheel (19) is rotated, the screw (34) drives the swinging clamping blocks (31) to clamp a guide rail (20), and the bottom plate (17) is fixed;
The auxiliary sliding assembly comprises an auxiliary gauge stand (30), a sliding block (18) and a linear guide mechanism, the sliding block (18) is arranged under the auxiliary gauge stand (30) to enable the auxiliary gauge stand (30) to move along the linear guide mechanism, and the auxiliary gauge stand (30) can be used for placing other measuring and detecting tools to detect the shaft diameter coaxiality of the camshaft, the straightness of the camshaft along the axis direction and the like.
The linear guide rail mechanism comprises two sets of linear guide rail mechanisms which are parallelly arranged on the base, one set of linear guide rail mechanism is matched with the front support seat assembly, the positioning and clamping mechanism, the tailstock assembly and the clamping and braking mechanism, the other set of linear guide rail mechanism is matched with the auxiliary gauge stand, the linear guide rail mechanism comprises a guide rail (20) and a stop block (29), the guide rail (20) is fixed on the base (1) through bolts, and the stop block (29) for preventing the sliding block (18) from sliding out of the guide rail (20) is arranged at the tail of the guide rail (20).
The invention discloses a camshaft symmetry detection device, which comprises the following specific measurement steps:
(1) According to the length of the cam shaft (21), the bottom plate (17) is slid to the proper position of the guide rail (20), and the hand wheel (19) of the clamping and braking mechanism is rotated to lock the bottom plate (17) on the guide rail (20);
(2) The camshaft (21) is supported by a 60-degree fixed center (6) and a 60-degree floating center (7), and the three-jaw chuck (8) clamps the tail section of the camshaft (21);
(3) The dial indicator (5) is arranged on the clamping block (4) through the locking hole B (28);
(4) The indexing block full line forcing (13) is buckled with the hard pin 10 at the front end of the rotary main shaft 9, and the dial indicator 5 measures the numerical value on the curve of the cam shaft 21;
(5) Lifting the indexing block (11), rotating the rotating main shaft (9) for 180 degrees, driving the cam shaft (21) to turn over by the three-jaw chuck (8), and turning over the two phi 10 hard pins for 180 degrees along with the rotating main shaft;
(6) The index block (11) is buckled down, the index block full line forcing (13) is well buckled with the hard pin (10) at the front end of the rotary main shaft (9), 180-degree index is realized, and a dial indicator (5) is used for measuring the numerical value on the curve at the other side of the cam shaft (21);
(7) Comparing the values to obtain whether the symmetry degree of the curves at the two sides of the cam shaft (21) is qualified;
(8) When needed, a magnetic dial indicator (5) gauge stand is placed on the auxiliary gauge stand (30), the coaxiality of the shaft diameter of the camshaft (21) relative to the central hole is detected, and the straightness of the camshaft (21) along the axial direction can be checked;
(9) And loosening the three-jaw chuck (8), and replacing the other camshaft for further inspection.
Experiments prove that the detection device is applied to links such as camshaft production detection and assembly detection, the symmetrical precision is reliably controlled, and the normal assembly of the brake is ensured.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the specific implementation of the invention is not limited by the foregoing, but rather is within the scope of the invention as long as various modifications are made by the method concept and technical scheme of the invention, or the concept and technical scheme of the invention are directly applied to other occasions without modification.
Claims (1)
1. A measuring method based on a camshaft symmetry detection device is characterized by comprising the following steps:
The camshaft symmetry detection device comprises a base, a front support assembly, a positioning and clamping mechanism, a tailstock assembly, a clamping and braking mechanism, an auxiliary measuring mechanism and a linear guide rail mechanism;
The front support assembly comprises a support, a support rod, a clamping block and a dial indicator, wherein the support is fixed at one end of the linear guide rail mechanism through a bolt, the support rod for fixing the clamping block is arranged in a hole at the upper end of the support in an interference fit manner, the clamping block is provided with an unlocking and locking hole A and a locking hole B, the clamping block is locked on the support rod through the locking hole A, and the dial indicator is locked on the clamping block through the locking hole B;
The positioning and clamping mechanism comprises a 60-degree fixed center, a 60-degree floating center, a three-jaw chuck, a rotary main shaft and an indexing block, wherein the 60-degree fixed center is arranged on a support of the front support assembly in an interference fit manner, the 60-degree floating center is arranged in a central hole of the rotary main shaft and in clearance fit with the central hole of the rotary main shaft, a compression spring for providing floating jacking force is sleeved at the middle section of the 60-degree floating center, and a nut for preventing falling out and adjusting the floating jacking force is arranged at the tail end of the 60-degree floating center; the three-jaw chuck for fixedly clamping the tail end of the cam shaft is arranged at the front end of the rotating main shaft and rotates along with the rotating main shaft, the front end of the rotating main shaft is provided with two horizontal holes, and hard pins which are lapped with full line forcing on the indexing block are arranged in the two horizontal holes; the 60-degree fixed center, the 60-degree floating center, the three-jaw chuck, the rotary main shaft, the central shaft of the indexing block and the lap joint of the indexing block full line forcing and the hard pin are all positioned on the same straight line and are parallel to the plane of the linear guide rail mechanism;
The tail seat assembly comprises a shell, a rear cover, a bottom plate, a tapered roller bearing, a round nut and a dust ring, wherein the rotary main shaft is supported in a shell hole through the tapered roller bearing, the round nut for adjusting the pretightening force of the bearing is fixed on the tail section of the rotary main shaft and locked by a locking plate, an indexing block is fixed on the shell through a pin shaft bolt and overturned around the pin shaft bolt, the dust ring is added at the front end of the shell, the shell and the bottom plate are welded together, and a slide block for enabling the bottom plate to move along a linear guide rail mechanism is arranged on the lower plane of the bottom plate;
The clamping and braking mechanism comprises two swing clamping blocks arranged at the tail end of a bottom plate of the tailstock assembly, a left-handed nut and a right-handed nut which are arranged in the swing clamping blocks and can swing around a pin shaft in opposite rotation directions, a screw rod with left-handed threads and right-handed threads respectively machined at two ends matched with the left-handed nut and the right-handed nut, and a hand wheel arranged on the screw rod;
the auxiliary measuring mechanism comprises an auxiliary gauge stand, a sliding block and a linear guide rail mechanism, wherein the sliding block is arranged below the auxiliary gauge stand, so that the auxiliary gauge stand moves along the linear guide rail mechanism, and other measuring and detecting tools can be placed on the auxiliary gauge stand to detect the shaft diameter coaxiality of the camshaft and the straightness of the camshaft along the axial direction;
The linear guide rail mechanism comprises two sets of linear guide rail mechanisms which are parallelly and parallelly arranged on the base, one set of linear guide rail mechanism is matched with the front support assembly, the positioning and clamping mechanism, the tailstock assembly and the clamping and braking mechanism, the other set of linear guide rail mechanism is matched with the auxiliary gauge stand, the linear guide rail mechanism comprises a guide rail and a stop block, the guide rail is fixed on the base through a bolt, and the stop block for preventing the sliding block from sliding out of the guide rail is arranged at the tail part of the guide rail;
The specific measurement steps comprise:
(1) According to the length of the cam shaft, the bottom plate is slid to a proper position of the guide rail, and a hand wheel of the clamping and braking mechanism is rotated to fix the bottom plate;
(2) The fixed center and the floating center are used for supporting the center holes at two ends of the cam shaft, and the three-jaw chuck clamps the tail section of the cam shaft;
(3) The dial indicator is arranged on the clamping block through the locking hole B;
(4) The indexing block full line forcing is buckled with a hard pin at the front end of the rotary main shaft, and a dial indicator measures the numerical value on the curve of the cam shaft;
(5) Lifting the indexing block, and rotating the main shaft to drive the cam shaft clamped by the three-jaw chuck to turn over 180 degrees;
(6) The index block is buckled down, the index block full line forcing is well buckled with a hard pin at the front end of the rotating main shaft, and a dial indicator measures the numerical value on the curve at the other side of the cam shaft;
(7) Comparing the values to obtain whether the symmetry degree of the curves at the two sides of the cam shaft is qualified;
(8) When needed, a magnetic dial indicator seat is placed on the auxiliary indicator seat, the coaxiality of the shaft diameter of the cam shaft relative to the center hole is detected, and the straightness of the cam along the axial direction can be checked;
(9) And loosening the three-jaw chuck, and replacing the other camshaft for further inspection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710708295.1A CN107421425B (en) | 2017-08-17 | 2017-08-17 | Camshaft symmetry detection device and measurement method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710708295.1A CN107421425B (en) | 2017-08-17 | 2017-08-17 | Camshaft symmetry detection device and measurement method thereof |
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| CN107421425A CN107421425A (en) | 2017-12-01 |
| CN107421425B true CN107421425B (en) | 2024-08-20 |
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| RU190578U1 (en) * | 2018-10-08 | 2019-07-04 | Ростовский вертолетный производственный комплекс, Публичное акционерное общество "Роствертол" имени Б.Н. Слюсаря | Device for checking and adjusting the alignment of the aggregates of the turning machining center |
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| CN201744722U (en) * | 2010-06-08 | 2011-02-16 | 台州今明机床有限公司 | Workpiece centering and clamping mechanism of numeric control cam milling machine |
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| CN207248079U (en) * | 2017-08-17 | 2018-04-17 | 青岛华瑞汽车零部件股份有限公司 | A kind of camshaft device for detecting symmetry degree |
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