CN114046934A - Crankshaft static unbalance measuring device and measuring method thereof - Google Patents
Crankshaft static unbalance measuring device and measuring method thereof Download PDFInfo
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- CN114046934A CN114046934A CN202111280121.2A CN202111280121A CN114046934A CN 114046934 A CN114046934 A CN 114046934A CN 202111280121 A CN202111280121 A CN 202111280121A CN 114046934 A CN114046934 A CN 114046934A
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- crankshaft
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/12—Static balancing; Determining position of centre of gravity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/02—Details of balancing machines or devices
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Abstract
A crankshaft static unbalance measuring device and a measuring method thereof relate to a crankshaft measuring device and a measuring method. Two supports are fixed on the bottom plate in parallel, two rollers are installed on the top of each support in a rotating mode, the four rollers are arranged in a rectangular mode and bear the two ends of the crankshaft to be measured at the same height, the crankshaft to be measured can rotate by taking the axis of the crankshaft to be measured as the center, and the magnetic weights are fixed on the crankshaft to be measured in an adsorbing mode. Calculating and manufacturing magnetic weights with corresponding weights, adjusting the crankshaft to be measured to four postures respectively, measuring the direction of the static unbalance according to the posture with the highest rotation speed, fixing the magnetic weights on the direction of the crankshaft to be measured opposite to the static unbalance in an adsorption manner, rotating the crankshaft to be measured to the posture with the highest speed again, and determining that the static unbalance is qualified if the rotation direction of the crankshaft to be measured is changed, or else, determining that the static unbalance is unqualified. The crankshaft static unbalance measuring device is simple in structure, can quickly and accurately measure whether the crankshaft static unbalance is qualified or not, and is suitable for being directly used in a production field.
Description
Technical Field
The invention relates to a crankshaft measuring device and a crankshaft measuring method, in particular to a crankshaft static unbalance measuring device and a crankshaft static unbalance measuring method, and belongs to the technical field of production and detection of engine parts.
Background
The crankshaft is the most important part of the engine, and the crankshaft bears the force transmitted by the connecting rod and converts the force into torque, the torque is output through the crankshaft and drives other accessories on the engine to work, and therefore, the quality of the crankshaft directly influences the performance of the engine.
The measurement of the crankshaft static unbalance amount is an indispensable measurement means in a quality inspection link, and the current methods for measuring the crankshaft static unbalance amount comprise two methods: the device can only measure the direction of the static unbalance amount, cannot accurately judge whether the static unbalance amount is qualified, and can measure the size of the static balance according to the lever principle.
Therefore, a measuring device which is simple in structure, suitable for being directly used in a production field and capable of rapidly and accurately measuring whether the static unbalance of the crankshaft is qualified or not is urgently needed.
Disclosure of Invention
The invention aims to provide a crankshaft static unbalance measuring device and a measuring method thereof, which have simple structure, can quickly and accurately measure whether the crankshaft static unbalance is qualified or not, and are suitable for being directly used in a production field.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a bent axle static unbalance amount measuring device, includes bottom plate, magnetic weight, two supports and four gyro wheels, two fixed supports, every are in parallel fixed on the bottom plate two gyro wheels of installation are rotated at the support top, leave the interval between two gyro wheels, four gyro wheels are the rectangle and arrange and can bear the both ends of the bent axle that awaits measuring at the same height, the bent axle that awaits measuring can use its axis to rotate as the center on four gyro wheels, the magnetic weight can adsorb to be fixed on the bent axle that awaits measuring.
A measuring method of a crankshaft static unbalance measuring device comprises the following steps:
the method comprises the following steps: calculating the weight of the magnetic weight according to the geometric dimension of the crankshaft to be measured and the static unbalance tolerance, and manufacturing the magnetic weight with the corresponding weight;
step two: placing two ends of a crankshaft to be tested on the four rollers;
step three: selecting one direction of a crankshaft to be tested as a reference, respectively adjusting the reference to four postures of 90-degree vertical upward, 0-degree horizontal direction, 45-degree inclined upward and 135-degree inclined upward according to the rotation angle, and visually recording the rotation speed and the rotation direction of the crankshaft to be tested under the four postures;
step four: measuring the direction of the static unbalance of the crankshaft to be measured according to the posture with the highest rotation speed and the corresponding rotation direction in the four postures in the step three;
step five: fixing the magnetic weight manufactured in the first step in a direction opposite to the crankshaft to be measured in an angle of 180 degrees with the static unbalance in an adsorption manner;
step six: rotating the crankshaft to be tested again to the direction corresponding to the posture with the highest rotating speed in the fourth step;
step seven: if the rotating direction of the crankshaft to be measured changes, the static unbalance amount of the crankshaft to be measured is qualified, otherwise, the static unbalance amount of the crankshaft to be measured is unqualified.
Compared with the prior art, the invention has the beneficial effects that: the crankshaft static unbalance measuring device is simple in structure, easy to produce and manufacture, simple and understandable in measurement, capable of rapidly and accurately measuring whether the crankshaft static unbalance is qualified or not by adjusting the crankshaft to be measured to four postures to observe and measure the direction of the static unbalance, adsorbing and fixing the magnetic weights with the corresponding weights calculated in advance in the direction of the crankshaft to be measured relative to the static unbalance, and finally changing the rotation direction of the crankshaft to be measured, low in cost, high in measurement efficiency, suitable for being directly used in a production field, and high in popularization and application value.
Drawings
FIG. 1 is a front view of a crankshaft static unbalance amount measuring device of the present invention;
FIG. 2 is a side view of a crankshaft static imbalance measuring device of the present invention;
FIG. 3 is a schematic diagram of the present invention illustrating the rotation angle of the crankshaft to be measured and the marking of the reference line;
FIG. 4 is a schematic view of attitude 1 of the crankshaft under test of the present invention;
FIG. 5 is a schematic view of attitude 2 of the crankshaft under test of the present invention;
FIG. 6 is a schematic view of attitude 3 of the crankshaft under test of the present invention;
FIG. 7 is a schematic view of attitude 4 of the crankshaft under test of the present invention;
FIG. 8 is a first schematic diagram illustrating the determination of whether the static unbalance amount of the crankshaft under test is qualified according to the present invention;
fig. 9 is a second schematic diagram illustrating the determination of whether the static unbalance amount of the crankshaft to be measured is qualified according to the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
As shown in fig. 1-2, a crankshaft static unbalance measuring device comprises a bottom plate 1, a magnetic weight 5, two brackets 2 and four rollers 3, two brackets 2 are fixed on the bottom plate 1 in parallel, the distance between the brackets 2 is determined according to the geometric dimension of a crankshaft 6 to be measured, two rollers 3 are rotatably arranged at the top of each bracket 2, two pin shafts 4 can be horizontally fixed on the top of the bracket 2, the rollers 3 are coaxially and rotatably arranged on the corresponding pin shafts 4 through bearings, a space is left between the two rollers 3, the distance between the two rollers 3 is also determined according to the geometric dimension of the crankshaft 6 to be measured, the four rollers 3 are arranged in a rectangular shape at the same height and can bear the two ends of the crankshaft 6 to be measured, the crankshaft 6 to be measured can rotate on the four rollers 3 by taking the axes thereof as the center, and the magnetic weights 5 can be adsorbed and fixed on the crankshaft 6 to be measured.
As shown in fig. 3 to 9, a measuring method of a crankshaft static unbalance measuring apparatus includes the steps of:
the method comprises the following steps: calculating the weight of the magnetic weight 5 according to the geometric dimension and the static unbalance tolerance of the crankshaft 6 to be measured, manufacturing the magnetic weight 5 with corresponding weight, taking the example that the magnetic weight 5 is fixedly adsorbed at the flange shaft neck of the crankshaft 6 to be measured, wherein the gyration radius of the flange shaft neck of the crankshaft 6 to be measured is 41.5mm, the static unbalance tolerance is 100g.cm, the weight of the magnetic weight 5 is 100g.cm/41.5mm, and 24.09g can be taken;
step two: placing two ends of a crankshaft 6 to be tested on the four rollers 3;
step three: selecting one direction of a crankshaft 6 to be measured as a reference, and adjusting the reference to four postures of 90-degree vertical upward, 0-degree horizontal direction, 45-degree inclined upward and 135-degree inclined upward according to the rotation angle and shown in fig. 4-7, respectively, visually recording the rotation speed and the rotation direction of the crankshaft 6 to be measured under the four postures (the rotation speed is obviously greater than that of the other three postures under the posture with poor static balance), for convenience of description, stipulating the static unbalance direction of the crankshaft 6 to be measured and marking a reference line 7 according to the posture with poor static balance shown in fig. 3, marking the crankshaft 6 to be measured with 0 degrees, 45 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees and 315 degrees along the clockwise direction according to the rotation angle, selecting the 90-degree direction as the reference, and drawing a reference line 7 on the surface of the crankshaft 6 to be measured so as to facilitate observation;
step four: specifically, with reference to fig. 3 to 7, if the crankshaft 6 to be measured in the posture 1 rotates counterclockwise, the static unbalance of the crankshaft 6 to be measured is in the direction of 0 ° in fig. 3, if the crankshaft 6 to be measured in the posture 1 rotates clockwise, the static unbalance of the crankshaft 6 to be measured is in the direction of 180 ° in fig. 3, if the crankshaft 6 to be measured in the posture 2 rotates counterclockwise, the static unbalance of the crankshaft 6 to be measured is in the direction of 90 ° in fig. 3, if the crankshaft 6 to be measured in the posture 2 rotates clockwise, the static unbalance of the crankshaft 6 to be measured is in the direction of 270 ° in fig. 3, and if the crankshaft 6 to be measured in the posture 3 rotates counterclockwise, the static unbalance of the crankshaft 6 to be measured is in the direction of 45 ° in fig. 3, if the crankshaft 6 to be measured rotates clockwise under the posture 3, the direction of the static unbalance amount of the crankshaft 6 to be measured is 225 degrees in the figure 3, if the crankshaft 6 to be measured rotates counterclockwise under the posture 4, the direction of the static unbalance amount of the crankshaft 6 to be measured is 315 degrees in the figure 3, and if the crankshaft 6 to be measured rotates clockwise under the posture 4, the direction of the static unbalance amount of the crankshaft 6 to be measured is 135 degrees in the figure 3;
step five: fixing the magnetic weight 5 manufactured in the step one in a direction opposite to the crankshaft 6 to be measured in an angle of 180 degrees with the static unbalance in an adsorption manner;
step six: rotating the crankshaft 6 to be tested again to the direction corresponding to the posture with the highest rotating speed in the fourth step;
step seven: referring to fig. 8 to 9, if the rotation direction of the crankshaft 6 to be measured changes, the static unbalance amount of the crankshaft 6 to be measured is qualified, otherwise, the static unbalance amount is not qualified.
Furthermore, in the step one, the magnetic weights 5 can be manufactured in a grading mode according to the static unbalance tolerance, the magnetic weights 5 manufactured in a grading mode are formed by combining a plurality of small magnetic weights, and the weights of the magnetic weights 5 with the weights larger than, equal to and smaller than the calculated weights can be obtained through the combination of different numbers of the small magnetic weights. The weight of the magnetic weight 5 is equal to the calculated weight of the magnetic weight 5 to meet the measurement requirement, and the weight of the magnetic weight 5 is greater than or less than the calculated weight of the magnetic weight 5, the range of the static unbalance amount of the crankshaft 6 to be measured can be further determined by gradually increasing or decreasing the weight of the magnetic weight 5, and then the range of the eccentric amount of the gravity center of the crankshaft 6 to be measured is calculated according to the range of the static unbalance amount of the crankshaft 6 to be measured, for example, the crankshaft 6 to be measured is 10kg in weight, the static unbalance amount is 50 g.cm-100 g.cm, and the eccentric amount of the gravity center of the crankshaft 6 to be measured is 50 g.cm-100 g.cm/10 kg-0.05 mm-0.10 mm, so that the processing program can be adjusted according to the value.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A crankshaft static unbalance measuring device is characterized in that: including bottom plate (1), magnetic weight (5), two supports (2) and four gyro wheels (3), two fixed supports (2) are arranged side by side on bottom plate (1), every support (2) top is rotated and is installed two gyro wheels (3), leave the interval between two gyro wheels (3), four gyro wheels (3) are the rectangle and arrange and can bear the both ends of the bent axle (6) that await measuring at the same height, bent axle (6) that await measuring can use its axis to rotate as the center on four gyro wheels (3), magnetic weight (5) can adsorb and fix on bent axle (6) that await measuring.
2. A crankshaft static unbalance measuring apparatus according to claim 1, wherein: two pin shafts (4) are horizontally fixed at the top of the support (2), and the roller (3) is coaxially and rotatably arranged on the corresponding pin shaft (4) through a bearing.
3. A measuring method of a crankshaft static unbalance measuring apparatus according to claim 1, characterized in that: the measuring method comprises the following steps:
the method comprises the following steps: calculating the weight of the magnetic weight (5) according to the geometric dimension and the static unbalance tolerance of the crankshaft (6) to be measured, and manufacturing the magnetic weight (5) with the corresponding weight;
step two: placing two ends of a crankshaft (6) to be tested on the four rollers (3);
step three: selecting one direction of the crankshaft (6) to be tested as a reference, adjusting the reference to four postures of 90-degree vertical upward, 0-degree horizontal direction, 45-degree inclined upward and 135-degree inclined upward according to the rotation angle, and visually recording the rotation speed and the rotation direction of the crankshaft (6) to be tested under the four postures;
step four: measuring the direction of the static unbalance of the crankshaft (6) to be measured according to the posture with the highest rotation speed and the corresponding rotation direction in the four postures in the step three;
step five: fixing the magnetic weight (5) manufactured in the first step in a direction opposite to the crankshaft (6) to be measured in an angle of 180 degrees with the static unbalance in an adsorption manner;
step six: rotating the crankshaft (6) to be tested again to the direction corresponding to the posture with the highest rotating speed in the fourth step;
step seven: if the rotating direction of the crankshaft (6) to be measured changes, the static unbalance amount of the crankshaft (6) to be measured is qualified, otherwise, the static unbalance amount is unqualified.
4. A measuring method according to claim 3, characterized in that: the magnetic weights (5) are manufactured in a grading mode according to the static unbalance tolerance in the first step, the magnetic weights (5) manufactured in a grading mode are formed by combining a plurality of small magnetic weights, and the weights of the magnetic weights (5) which are larger than, equal to and smaller than the calculated weight can be obtained through the combination of different numbers of the small magnetic weights.
5. The measurement method according to claim 3 or 4, characterized in that: and after the reference is selected in the third step, drawing a reference line (7) on the surface of the crankshaft (6) to be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111280121.2A CN114046934B (en) | 2021-10-28 | 2021-10-28 | Crankshaft static unbalance measuring device and measuring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111280121.2A CN114046934B (en) | 2021-10-28 | 2021-10-28 | Crankshaft static unbalance measuring device and measuring method thereof |
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| CN113405724A (en) * | 2021-07-30 | 2021-09-17 | 青岛德盛机械制造有限公司 | Crankshaft static balance detection device |
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