CN107514965B - Crankshaft main journal roundness and crankshaft coaxiality error detection device - Google Patents
Crankshaft main journal roundness and crankshaft coaxiality error detection device Download PDFInfo
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- CN107514965B CN107514965B CN201710731169.8A CN201710731169A CN107514965B CN 107514965 B CN107514965 B CN 107514965B CN 201710731169 A CN201710731169 A CN 201710731169A CN 107514965 B CN107514965 B CN 107514965B
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 38
- 230000008859 change Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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- 238000003754 machining Methods 0.000 description 1
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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
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
- G01B5/201—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures for measuring roundness
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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
- G01B5/003—Measuring of motor parts
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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
The invention discloses a crankshaft main journal roundness and crankshaft coaxiality error detection device, which comprises: a bracket having a support bar and a base; the measuring module is used for measuring the roundness and the coaxiality of the main journal of the crankshaft to be measured; the calibration component is used for calibrating the measurement module before measurement; the tailstock center fixing assembly is used for installing the crankshaft to be tested and the calibration assembly on the bracket; the measuring module measures the roundness and the coaxiality of the main journal of the crankshaft to be measured after calibration so as to perform error detection on the roundness and the coaxiality of the main journal of the crankshaft to be measured. The device for detecting the roundness of the main journal of the crankshaft and the coaxiality error of the crankshaft has the advantages of simple operation, low manufacturing cost, no need of high requirement on detection capability, measurement precision of 0.001mm and capability of meeting the measurement of the roundness and the coaxiality of rotary parts.
Description
Technical Field
The invention belongs to the field of detection devices, and particularly relates to a device for detecting roundness of a main journal of a crankshaft and coaxiality errors of the crankshaft.
Background
The crankshaft of the engine is one of the very important parts in the engine, and is used for converting gas force transmitted by a piston and a connecting rod into torque output so as to drive power tools connected with the crankshaft, such as a flywheel, a front end pulley and the like, and further drive a valve mechanism of the engine and various moving accessories of the engine. Therefore, the rotation of the crankshaft can be said to be the power source of the engine and also the power source of the whole mechanical system.
When the engine works, the crankshaft is under the action of great gas pressure and inertia force to transmit great torque, and meanwhile, the crankshaft is under the action of periodical alternating loads such as tension, compression, bending and torsion, so that high requirements on the machining precision and the assembling precision of the crankshaft are provided. The roundness of the main journal of the crankshaft and the coaxiality precision of the crankshaft are one of very important processing precisions, the crankshaft is assembled in a bearing hole on an engine cylinder body, the roundness of the main journal of the crankshaft influences the assembly clearance with the bearing hole, and the coaxiality precision of the crankshaft influences the running stability of the whole engine.
Usually, the coaxiality error of the main journal of the crankshaft is not more than 0.05mm, and the error is large and called crankshaft bending. When the coaxiality of the crankshaft exceeds an error value, the abrasion of the piston connecting rod group and the cylinder is aggravated, and the gap of a lubricating oil film is influenced, so that the abrasion of a main journal of the crankshaft and a bearing hole on a cylinder body is aggravated, the crankshaft is broken due to fatigue in serious conditions, and the engine is scrapped. Therefore, in a research and development trial-manufacturing stage or a batch production stage (namely before crankshaft assembly), the roundness error and the coaxiality error of the main journal of the crankshaft of each engine need to be detected, and the subsequent assembly with the bearing hole on the cylinder body can be carried out only after the main journal of the crankshaft of each engine is qualified.
Taking a four-cylinder in-line engine as an example, main journals of five gears of a crankshaft are matched with five bearing holes on a cylinder body, the matching clearance needs to be very small, so that a lubricating oil film is formed in front of the main journals of the crankshaft and the bearing holes on the cylinder body in the high-speed running process of the engine, the lubricating oil film reduces the friction coefficient and mechanical loss of the crankshaft, the working efficiency of the engine is improved, the whole engine runs more stably, and the vibration noise is lower.
Chinese patent application publication No. CN106017276A, published as 2016, 10, month, and 12, discloses a tool for detecting the center distance between crankshafts, wherein a roundness error detection device for main journals of crankshafts of an engine is to place the main journals at both ends of a crankshaft on two V-shaped supports on a test flat plate, fix a dial gauge stand on the flat plate, and adjust a gauge stand to align a gauge contact with the main journal of the crankshaft. And calibrating the dial indicator, slowly rotating the crankshaft for a circle by hand, reading the maximum and minimum indicated values of the dial indicator, and taking half of the difference between the maximum and minimum indicated values as the roundness error of the main journal of the crankshaft. The same method is used for measuring the roundness error of each main journal of other gears on the same crankshaft. The roundness error of the main journal of the crankshaft measured by the device is not more than 0.05mm, and the crankshaft is judged to be qualified.
Above-mentioned current crankshaft main journal circularity error detection instrument's simple structure uses a percentage table to install and detects on the percentage table seat. The roundness error of the main journal of one gear on the crankshaft can be measured each time, and when the roundness errors of the main journals of other gears are measured, the dial indicator seat is moved and the pointer of the dial indicator needs to be calibrated again. Therefore, the roundness error of the main journal of each gear on the same crankshaft does not form continuous measuring steps, and the dial indicator also has artificial operation errors in the moving and adjusting processes, so that the final measurement indicating value is greatly influenced, and the measurement precision is reduced. Meanwhile, the crankshaft roundness error measured in the prior art does not have a uniform standard, and the skill levels of measuring personnel are different when the dial indicator is used for measurement, so that the measured data has great fluctuation, and the measurement precision is obviously not enough for the crankshaft roundness which is only allowed to have the error of 0.05 mm.
Disclosure of Invention
In order to solve the problems, the invention provides a device for detecting the roundness of a crankshaft main journal and the coaxiality error of the crankshaft, so as to improve the measurement efficiency and the measurement precision of the roundness of the crankshaft main journal and the coaxiality error of the crankshaft.
The invention provides a crankshaft main journal roundness and crankshaft coaxiality error detection device, which comprises: a bracket having a support bar and a base; the measuring module is used for measuring the roundness and the coaxiality of the main journal of the crankshaft to be measured; the calibration component is used for calibrating the measurement module before measurement; the tailstock center fixing assembly is used for installing the crankshaft to be tested and the calibration assembly on the bracket; the measuring module measures the roundness and the coaxiality of the main journal of the crankshaft to be measured after calibration so as to perform error detection on the roundness and the coaxiality of the main journal of the crankshaft to be measured.
As a further optimization of the invention, the measuring module comprises a first guide rail, the first guide rail is vertically arranged on a base of the bracket, a horizontally arranged beam is movably mounted on the first guide rail, a first measuring meter and a second measuring meter are respectively arranged on two sides of the beam, the beam can vertically move on the first guide rail to drive the first measuring meter and the second measuring meter to move up and down, a second positioning nut capable of limiting the beam is arranged below the beam, and the first measuring meter and the second measuring meter can measure roundness and coaxiality of a main journal of a crankshaft to be measured.
As a further optimization of the present invention, the first measuring meter includes a first measuring rod extending vertically, the end of the first measuring rod has a first measuring head, the second measuring meter includes a second measuring rod extending vertically, the end of the second measuring rod has a second measuring head, and both the first measuring rod and the second measuring rod can move telescopically and vertically to contact or separate from the outer circumferential surface of the crankshaft to be measured, so as to measure and change the measuring position of the crankshaft to be measured.
As a further optimization of the present invention, the measuring module further includes a second rail extending along the transverse direction and disposed on the base of the bracket, a lower end of the first rail is disposed in the second rail and can horizontally move in the second rail, and a third positioning nut is disposed on the first rail and can fixedly connect the lower end of the first rail with the second rail to define the position of the first rail.
As a further optimization of the invention, the support rod of the support is U-shaped and comprises a cross rod and two support legs movably connected with the cross rod, an adjusting groove is arranged on the base of the support, the end parts of the two support legs of the support rod extend into the adjusting groove and can horizontally and transversely move in the adjusting groove, a first positioning nut is sleeved on the support leg of the support rod, and after the width between the two support legs of the support rod is adjusted, the first positioning nut is rotated to position the support leg.
As a further optimization of the invention, the adjusting groove is a strip-shaped adjusting groove or two adjusting grooves which are arranged at intervals and are collinear.
As a further optimization of the invention, the tailstock center fixing component comprises a tailstock component and a center component, the tailstock component is arranged on a supporting leg of the supporting rod, the center component is movably arranged in the tailstock component, two end faces of the calibration component or the crankshaft to be tested are provided with concave holes, and a pointed end of the center component is inserted into the concave holes so as to clamp the calibration component or the crankshaft to be tested from two sides.
As a further optimization of the invention, the concave hole on the calibration component or the crankshaft to be tested is arranged in the center of the end surface so as to ensure that the rotary central axis of the crankshaft to be tested is coaxial with the actual axis of the crankshaft to be tested.
As a further optimization of the invention, the tailstock center fixing assembly further comprises a handle part, the handle part is connected with the center assembly, the handle part is swung to drive the center assembly to rotate in the tailstock assembly, and the center assembly rotates to drive the crankshaft to be measured to rotate, so that the measurement of the roundness of the main journal of the crankshaft to be measured is completed.
As a further optimization of the invention, the calibration assembly is a calibration core rod, the outer diameter of the calibration core rod is the same as the outer diameter of the main journal of the crankshaft to be measured, and the coaxiality grade of the calibration core rod is higher than the tolerance grade requirement of the crankshaft to be measured.
The device for detecting the roundness of the main journal of the crankshaft and the coaxiality error of the crankshaft has the advantages of simple operation, low manufacturing cost, no need of high requirement on detection capability, measurement precision of 0.001mm and capability of meeting the measurement of the roundness and the coaxiality of rotary parts.
The device for detecting the roundness of the main journal of the crankshaft and the coaxiality error of the crankshaft has the following advantages:
1) in the detection process, the crankshaft rotates along the central axis, the detection reference is ensured to be the same as the processing reference, and the measurement error is reduced;
2) the two sets of dial gauges are adopted to measure the sizes of the main journals of the adjacent gears, the measurement efficiency is high, the main journals of the same gear are repeatedly measured to obtain an average value, the measurement error is reduced, and the method is suitable for being used in enterprise workshops and research and development mechanisms;
3) the universality is good, the functions are various, and the main journal roundness and the crankshaft coaxiality error can be measured simultaneously on various crankshafts.
Drawings
FIG. 1 is a schematic structural diagram of a crankshaft main journal roundness and crankshaft coaxiality error detection device provided with a crankshaft to be detected according to the present invention;
FIG. 2 is a schematic structural diagram of the device for detecting the roundness of the main journal of the crankshaft and the coaxiality error of the crankshaft according to the present invention;
fig. 3 is a schematic structural diagram of a measurement module in the device for detecting roundness of a main journal of a crankshaft and coaxiality error of the crankshaft of the present invention.
Description of reference numerals:
10-support rod 101-first positioning nut 11-base 110-adjusting groove 2-measuring module 200-first measuring meter 201-second measuring meter 210-first measuring rod 211-second measuring rod 220-first measuring head 221-second measuring head 23-first guide rail 231-second positioning nut 24-second guide rail 241-third positioning nut 25-beam 30-tailstock assembly 31-tip assembly 32-handle part 40-calibration core rod 50-crankshaft 501-neck to be measured
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The device for detecting the roundness of the main journal of the crankshaft and the coaxiality error of the crankshaft comprises a support, a measuring module 2, a tailstock center fixing assembly and a calibrating assembly, wherein the calibrating assembly and the crankshaft to be detected are installed on the support through the tailstock center fixing assembly, the calibrating assembly can be a calibrating core rod 40 and is used for calibrating the measuring module 2 before measurement, and the measuring module 2 can measure the crankshaft to be detected so as to measure the roundness error and the coaxiality error of the main journal of the crankshaft to be detected, so that whether the crankshaft is qualified is detected.
The support comprises a support rod 10 and a base 11, the support rod 10 comprises two support legs and is U-shaped, a crankshaft to be measured is fixed on the support rod 10 through a tailstock center fixing assembly, and two ends of the lower side of the support rod 10 are connected with the base 11. Preferably, the base 11 is provided with an adjusting groove 110, such as an elongated adjusting groove or two adjusting grooves 110 that are collinear and spaced, two ends of the lower side of the supporting rod 10 can be installed or inserted into the adjusting groove 110 and connected with the base 11 through a first positioning nut 101, the connection between the lower end of the supporting rod 10 and the base 11 can be tightened or loosened by rotating the first positioning nut 101, after the first positioning nut 101 is loosened by rotating, the supporting rod 10 can horizontally/transversely move on the base 11 along the adjusting groove 110, after the moving operation of the supporting rod 10 is completed, the tightening can fixedly connect the lower end of the supporting rod 10 with the base 11 again, so as to adjust the width of the supporting rod 10 (i.e. the distance between the two legs) in the transverse direction, and facilitate the connection of the tip fixing component with the crankshaft to be measured and the calibration core rod 40.
The tailstock center fixing assembly comprises a tailstock assembly 30, a center assembly 31 and a handle portion 32 connected with the center assembly 31, the tailstock assembly is arranged on a supporting leg of the supporting rod, and the center assembly is movably arranged in the tailstock assembly. The tip of the tip assembly 31 is connected with two ends of the calibration core rod 40 or the crankshaft 50 respectively, two end faces of the calibration core rod 40 and the crankshaft 50 are provided with concave holes so as to facilitate the insertion of the tip assembly 31, the calibration core rod 40 and the crankshaft 50 are clamped from two sides, the central hole is coaxial with the central axis of the crankshaft, and the central axis of rotation is ensured to be coaxial with the actual axis of the crankshaft or the calibration core rod. For example, in connection with the side center point of the crankshaft 50, the tip of the tip assembly 31 presses or abuts against the side center point of the crankshaft 50 to fix the alignment core rod 40 or the crankshaft 50 to the support rod 10. Therefore, the crankshaft is clamped by the two groups of tailstock assemblies and the center assembly for measurement, the measurement reference and the processing reference of the crankshaft are unified to be the rotation central axis of the crankshaft, and the handle part arranged on the tailstock assembly can simply drive the crankshaft to rotate around the central axis of the crankshaft.
The calibration core rod 40 is installed on the upper portion of the support rod 10 through the tailstock center fixing component, the tailstock center fixing component is respectively arranged on the two support legs of the support rod 10, the calibration core rod 40 is installed between the two support legs through the tailstock component 30 and the center component 31, so that the calibration core rod 40 is connected with the support rod, and the handle portion 32 is shaken to drive the calibration core rod 40 to rotate. The outer diameter of the calibration core rod 40 is basically the same as the outer diameter of the main journal 501, and the coaxiality grade of the calibration core rod 40 is higher than the tolerance grade requirement of the crankshaft 50 to be measured, so that the calibration function is achieved. The calibration core rod is arranged on the supporting rod, and the measuring head and the measuring meter of the measuring module can be calibrated at any time according to the detection result so as to ensure the data precision in the measuring process.
The crankshaft 50 to be measured is installed in the lower part of the supporting rod 10 through the tailstock center fixing component, the tailstock center fixing component is respectively arranged on the two supporting legs of the supporting rod 10, the tailstock component 30 and the center component 31 can be used for fixing the crankshaft 50 to be measured, the tip of the center component 31 is respectively connected with the two ends of the crankshaft 50 to be measured, for example, the side center of the crankshaft 50 to be measured is connected with the supporting rod, and the handle portion 32 is shaken to drive the crankshaft 50 to be measured to rotate.
As shown in fig. 2-3, the measuring module 2 includes a first guide rail 23, a cross beam 25, a first meter 200, and a second meter 201, wherein the first guide rail 23 is vertically disposed, and the cross beam 25 is horizontally disposed and movably mounted on the first guide rail 23. The first gauge 200 and the second gauge 201 are respectively arranged on two sides of the beam 25, and are preferably symmetrically arranged along the first guide rail 23, and the first gauge 200 and the second gauge 201 are preferably dial gauges with the accuracy of 0.001 mm. The first meter 200 comprises a first measuring rod 210 extending vertically, the end of the first measuring rod 210 is provided with a first measuring head 220, the second meter 201 comprises a second measuring rod 211 extending vertically, the end of the second measuring rod 211 is provided with a second measuring head 221, and both the first measuring rod 210 and the second measuring rod 211 can move telescopically along the vertical direction. The crossbeam 25 can vertically reciprocate on first guide rail 23, is provided with second set nut 231 on the first guide rail 23, and after the height of crossbeam 25 has been adjusted along vertical removal, second set nut 231 can carry out spacingly to the height of crossbeam 25.
Further, the measuring module 2 further includes a second guide rail 24 and a third positioning nut 241, the second guide rail 24 extends transversely and is disposed on the base 11, the lower end of the first guide rail 23 is disposed in the second guide rail 24 and can move horizontally and transversely in the second guide rail 24, the third positioning nut 241 is sleeved on the first guide rail 23, and after the vertically disposed first guide rail 23 moves along the transversely disposed second guide rail 24, the third positioning nut 241 can fixedly connect the lower end of the first guide rail 23 with the second guide rail 24 to define the position of the first guide rail 23.
Therefore, after zero calibration is completed, the measuring head is moved to enable the measuring head to be in contact with the main journal of the crankshaft, the indication value of the measuring meter is observed, and crankshaft coaxiality error detection is completed; the crankshaft 50 is driven to rotate by rotating the handle part, so that the roundness error of the main journal 501 of the adjacent gear can be detected, the measurement precision is improved, and the measurement efficiency is greatly improved.
The use of the device for detecting the roundness of the main journal of the crankshaft and the coaxiality error of the crankshaft comprises the following steps (taking the crankshaft comprising five gears as an example):
firstly, before using the device for detecting the roundness of the main journal of the crankshaft and the coaxiality error of the crankshaft, calibrating the measuring module 2, wherein the calibrating core rod 40 is fixed between the tailstock assembly 30 and the tip assembly 31 on the upper part of the supporting rod 10, and the handle part 32 is ensured to be rotated to drive the calibrating core rod 40 to easily and freely rotate; loosening the second positioning nut 231 to raise the beam 25 to the measurement position along the first guide rail 23, adjusting the extension lengths of the first measuring rod 210 and the second measuring rod 211 to make the first measuring head 220 and the second measuring head 221 respectively contact with the outer circular surface of the calibration mandril 40, rotating the handle part 32 to drive the calibration mandril 40 to rotate for a circle, observing the change of the pointers of the first measuring meter 200 and the second measuring meter 201, and adjusting the pointers of the first measuring meter 200 and the second measuring meter 201 to make them align with the zero scale of the dial.
Then, after the measurement module 2 is zeroed, the crankshaft 50 to be measured is installed between the tailstock assembly 30 and the center assembly 31 at the lower part of the support rod 10, the first positioning nut 101 is loosened to adjust the support, then the first positioning nut 101 is fixed, the second positioning nut 231 is loosened to enable the cross beam 25 to move downwards along the first guide rail 23 until the first measuring head 220 is in contact with the main journal 501 of the first gear of the crankshaft 50, the second measuring head 221 is in contact with the main journal 501 of the second gear of the main shaft 50, the second positioning nut 231 is locked to fix the cross beam 25, the handle portion 32 is manually rotated to enable the crankshaft 50 to rotate for one circle, changes of the first measuring meter 200 and the second measuring meter 201 are observed, the roundness error measurement result takes the rotation center as an axis, and the difference between the maximum indication value and the minimum indication value is the coaxiality error value of.
Finally, the third positioning nut 241 is loosened to slide the first rail 23 on the second rail 24 until the first measuring head contacts with the main journal 501 of the third gear of the main shaft 50, the second measuring head 221 contacts with the main journal 501 of the fourth gear of the crankshaft 50, the third positioning nut 241 is locked to fix the first rail 23, the handle part 32 is operated to rotate the crankshaft 50 for measurement, and the measurement of other adjacent gears is sequentially performed by referring to the above operations, thereby completing the measurement of the whole crankshaft.
Because the diameter of the calibration core rod 40 is the same as the outer diameter of the main journal 501 of the crankshaft 50 to be measured, after the first measuring gauge 200 and the second measuring gauge 201 finish zero calibration, the cross beam 25 can be directly lowered to the lower part of the support rod 10 along the first guide rail 23, so that the first measuring gauge 220 and the second measuring gauge 221 align with the main journals 501 of different gears of the crankshaft 50 to measure, thereby the roundness error of the main journals of two adjacent gears can be measured at one time, and meanwhile, the roundness error of the main journals of two adjacent gears can be repeatedly measured, so that the average value is obtained by measuring for many times, the measurement error is reduced, after the measurement is finished, the measurement tool does not need to be adjusted, the measuring rod only needs to be retracted, the fixing nut is loosened, and then the fixing nut is moved to the next crankshaft main journal measurement position along the horizontal direction of the measurement guide rail, the crankshaft is.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (4)
1. The utility model provides a bent axle main journal circularity and bent axle axiality error detection device which characterized in that includes:
a bracket having a support bar and a base;
the measuring module is used for measuring the roundness and the coaxiality of the main journal of the crankshaft to be measured;
the calibration component is used for calibrating the measurement module before measurement;
the tailstock center fixing assembly is used for installing the crankshaft to be tested and the calibration assembly on the bracket;
the measuring module measures the roundness and the coaxiality of the main journal of the crankshaft to be measured after calibration so as to perform error detection on the roundness and the coaxiality of the main journal of the crankshaft to be measured;
the measuring module comprises a first guide rail, the first guide rail is vertically arranged on a base of the support, a horizontally arranged cross beam is movably mounted on the first guide rail, a first measuring meter and a second measuring meter are respectively arranged on two sides of the cross beam, the cross beam can vertically move on the first guide rail to drive the first measuring meter and the second measuring meter to move up and down, a second positioning nut capable of limiting the cross beam is arranged below the cross beam, and the first measuring meter and the second measuring meter can measure the roundness and the coaxiality of a main journal of a crankshaft to be measured;
the first measuring meter comprises a first measuring rod extending vertically, a first measuring head is arranged at the end part of the first measuring rod, the second measuring meter comprises a second measuring rod extending vertically, a second measuring head is arranged at the end part of the second measuring rod, and the first measuring rod and the second measuring rod can vertically move in a telescopic mode to be in contact with or separated from the outer circular surface of the crankshaft to be measured so as to measure the crankshaft to be measured and change the measuring position;
the measuring module further comprises a second guide rail and a third positioning nut, the second guide rail extends along the transverse direction and is arranged on the base of the support, the lower end of the first guide rail is arranged in the second guide rail and can horizontally and transversely move in the second guide rail, the third positioning nut is sleeved on the first guide rail, and the third positioning nut can fixedly connect the lower end of the first guide rail with the second guide rail so as to limit the position of the first guide rail;
the tailstock center fixing assembly comprises a tailstock assembly and a center assembly, the tailstock assembly is arranged on a supporting leg of the supporting rod, the center assembly is movably arranged in the tailstock assembly, two end faces of the calibration assembly or the crankshaft to be tested are provided with concave holes, and a pointed end of the center assembly is inserted into the concave holes so as to clamp the calibration assembly or the crankshaft to be tested from two sides;
the calibration assembly or the concave hole on the crankshaft to be tested is arranged in the center of the end surface so as to ensure that the rotary central axis of the crankshaft to be tested is coaxial with the actual axis of the crankshaft to be tested;
the tailstock center fixing assembly further comprises a handle portion, the handle portion is connected with the center assembly, the center assembly can be driven to rotate in the tailstock assembly by swinging the handle portion, and the center assembly rotates to drive the crankshaft to be measured to rotate, so that the roundness measurement of the main journal of the crankshaft to be measured is completed.
2. The device for detecting the roundness of the main journal of the crankshaft and the coaxiality error of the crankshaft as claimed in claim 1, wherein the support rod of the support is U-shaped and comprises a cross rod and two legs movably connected with the cross rod, an adjusting groove is formed in a base of the support, the end portions of the two legs of the support rod extend into the adjusting groove and can horizontally and transversely move in the adjusting groove, a first positioning nut is sleeved on the leg of the support rod, and the first positioning nut is rotated to position the leg after the width between the two legs of the support rod is adjusted.
3. The apparatus for detecting roundness of main journal and coaxiality error of crankshaft of claim 2, wherein the adjustment groove is an elongated adjustment groove or two adjustment grooves spaced apart and collinear.
4. The device for detecting the roundness of the main journal of the crankshaft and the error of the coaxiality of the crankshaft as claimed in claim 1, wherein the calibration assembly is a calibration core rod, the outer diameter of the calibration core rod is the same as the outer diameter of the main journal of the crankshaft to be measured, and the coaxiality grade of the calibration core rod is higher than the tolerance grade requirement of the crankshaft to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710731169.8A CN107514965B (en) | 2017-08-23 | 2017-08-23 | Crankshaft main journal roundness and crankshaft coaxiality error detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710731169.8A CN107514965B (en) | 2017-08-23 | 2017-08-23 | Crankshaft main journal roundness and crankshaft coaxiality error detection device |
Publications (2)
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