CN114046934B - 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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- CN114046934B CN114046934B CN202111280121.2A CN202111280121A CN114046934B CN 114046934 B CN114046934 B CN 114046934B CN 202111280121 A CN202111280121 A CN 202111280121A CN 114046934 B CN114046934 B CN 114046934B
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- crankshaft
- static unbalance
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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
-
- 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
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 rotatably mounted at the top of each support, four rollers are arranged in a rectangular shape and bear two ends of a crankshaft to be tested at the same height, the crankshaft to be tested can rotate by taking the axis of the crankshaft to be tested as the center, and the magnetic weights are adsorbed and fixed on the crankshaft to be tested. Calculating and manufacturing magnetic weights with corresponding weights, respectively adjusting the crankshaft to be measured to four postures, measuring the direction of the static unbalance according to the posture with the fastest rotation speed, adsorbing and fixing the magnetic weights in the direction of the crankshaft to be measured opposite to the static unbalance, rotating the magnetic weights to the posture with the fastest rotation speed again, and if the rotation direction of the crankshaft to be measured changes, the static unbalance is qualified, otherwise, the crankshaft to be measured is disqualified. The device has a simple structure, can rapidly and accurately measure whether the static unbalance of the crankshaft is qualified or not, and is suitable for being directly used on a production site.
Description
Technical Field
The invention relates to a crankshaft measuring device and a measuring method, in particular to a crankshaft static unbalance measuring device and a measuring method thereof, and belongs to the technical field of production and detection of engine parts.
Background
The crankshaft is the most important component in an engine, and it receives the force from the connecting rod and converts it into torque, and outputs and drives other accessories on the engine to work through the crankshaft, so the quality of the crankshaft directly affects the performance of the engine.
The measurement of the static unbalance of the crankshaft is an indispensable measurement means in a quality inspection link, and two methods for measuring the static unbalance of the crankshaft exist at present: a common static balance frame is provided, the device can only measure the direction of static unbalance amount, can not accurately judge whether the static unbalance amount is qualified, and the device can measure the static balance amount according to the lever principle, but has complex general structure, low measurement efficiency and is not suitable for direct use in a production field.
Therefore, a measuring device with a simple 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 needed.
Disclosure of Invention
The invention aims to provide a crankshaft static unbalance measuring device and a measuring method thereof, which have simple structures, can rapidly 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 above purpose, the invention adopts the following technical scheme:
the utility model provides a crankshaft static unbalance measuring device, includes bottom plate, magnetism weight, two supports and four gyro wheels, two supports are fixed side by side on the bottom plate, every two gyro wheels of support top rotation installation, leave the interval between two gyro wheels, four gyro wheels are the rectangle and arrange and can bear the weight of the both ends of treating the crankshaft that awaits measuring at same height, the crankshaft that awaits measuring can rotate on four gyro wheels with its axis as the center, magnetism weight can adsorb to be fixed on the crankshaft that awaits measuring.
A measuring method of a crankshaft static unbalance measuring device comprises the following steps:
step one: 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 four rollers;
step three: selecting one direction of a crankshaft to be tested as a reference, and respectively adjusting the reference to four postures of 90-degree vertical upwards, 0-degree horizontal direction, 45-degree inclined upwards and 135-degree inclined upwards 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 static unbalance of the crankshaft to be measured according to the gesture with the highest rotation speed in the four gestures in the third step and the corresponding rotation direction;
step five: the magnetic weight manufactured in the first step is adsorbed and fixed on the direction that the crankshaft to be tested is 180 degrees opposite to the static unbalance;
step six: rotating the crankshaft to be tested to the direction corresponding to the gesture with the highest rotation speed in the fourth step again;
step seven: if the rotation direction of the crankshaft to be tested changes, the static unbalance of the crankshaft to be tested is qualified, otherwise, the static unbalance of the crankshaft to be tested is disqualified.
Compared with the prior art, the invention has the beneficial effects that: the invention has simple structure, easy production and manufacture, simple and easy measurement, and can quickly and accurately measure whether the static unbalance of the crankshaft 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 pre-calculated corresponding weights in the direction of the crankshaft to be measured opposite to the static unbalance and finally changing the rotation direction of the crankshaft to be measured.
Drawings
FIG. 1 is a front view of a crankshaft static unbalance measurement device of the present invention;
FIG. 2 is a side view of the crankshaft static unbalance measurement device of the present invention;
FIG. 3 is a schematic representation of the marking of the crankshaft rotation angle and the reference line to be measured in accordance with the present invention;
FIG. 4 is a schematic view of the attitude 1 of the crankshaft under test of the present invention;
FIG. 5 is a schematic view of the attitude 2 of the crankshaft under test of the present invention;
FIG. 6 is a schematic view of the attitude 3 of the crankshaft under test of the present invention;
FIG. 7 is a schematic view of the attitude 4 of the crankshaft under test of the present invention;
FIG. 8 is a diagram showing a first determination of whether the static unbalance amount of the crankshaft to be measured is acceptable according to the present invention;
fig. 9 is a second schematic diagram for determining whether the static unbalance amount of the crankshaft to be tested is acceptable or not.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are all within the protection scope of the present invention.
As shown in fig. 1-2, the static unbalance measuring device for the crankshaft comprises a bottom plate 1, magnetic weights 5, two supports 2 and four rollers 3, wherein the two supports 2 are fixed on the bottom plate 1 in parallel, the distance between the supports 2 is determined according to the geometric dimension of the crankshaft 6 to be measured, each support 2 is provided with the two rollers 3 in a rotating mode, specifically, two pin shafts 4 can be horizontally fixed on the tops of the supports 2, the rollers 3 are coaxially arranged on the corresponding pin shafts 4 in a rotating mode through bearings, an interval is reserved between the two rollers 3, the distance between the two rollers 3 is determined according to the geometric dimension of the crankshaft 6 to be measured, the four rollers 3 are arranged in a rectangular mode and can bear the two ends of the crankshaft 6 to be measured at the same height, the crankshaft 6 to be measured can rotate on the four rollers 3 by taking the axis of the crankshaft 3 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 device includes the steps of:
step one: calculating the weight of the magnetic weight 5 through the geometric dimension of the crankshaft 6 to be tested and the tolerance of the static unbalance, and manufacturing the magnetic weight 5 with the corresponding weight, taking the adsorption and fixation of the magnetic weight 5 at the flange journal of the crankshaft 6 to be tested as an example, wherein the radius of gyration of the flange journal of the crankshaft 6 to be tested is 41.5mm, the tolerance of the static unbalance is 100g.cm, and 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 the crankshaft 6 to be measured as a reference, respectively adjusting the reference to four postures of 90 degrees vertical upwards, 0 degrees horizontal direction, 45 degrees inclined upwards and 135 degrees inclined upwards according to the rotation angle as shown in fig. 4-7, visually recording the rotation speed and the rotation direction of the crankshaft 6 to be measured (the rotation speed is obviously higher than that of the other three postures in the postures with poor static balance) in the four postures, prescribing and marking the static unbalance direction of the crankshaft 6 to be measured according to the reference line 7 as shown in fig. 3, respectively marking the crankshaft 6 to be measured as 0 degree, 45 degree, 90 degree, 135 degree, 180 degree 225 degree, 270 degree and 315 degree according to the rotation angle along the clockwise direction, 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 be convenient for observation;
step four: according to the gesture and the corresponding rotation direction of the fastest rotation speed of the four gestures of the third step, the direction of the static unbalance amount of the crankshaft 6 to be measured is measured, specifically, in combination with fig. 3 to 7, if the crankshaft 6 to be measured rotates anticlockwise in gesture 1, the direction of the static unbalance amount of the crankshaft 6 to be measured is 0 DEG in fig. 3, if the crankshaft 6 to be measured rotates clockwise in gesture 1, the direction of the static unbalance amount of the crankshaft 6 to be measured is 180 DEG in fig. 3, if the crankshaft 6 to be measured rotates anticlockwise in gesture 2, the direction of the static unbalance amount of the crankshaft 6 to be measured is 90 DEG in fig. 3, if the crankshaft 6 to be measured rotates clockwise in gesture 2, the direction of the static unbalance amount of the crankshaft 6 to be measured is 270 DEG in fig. 3, if the crankshaft 6 to be measured rotates anticlockwise in gesture 3, the direction of the crankshaft 6 to be measured is 45 DEG in fig. 3, if the crankshaft 6 to be measured rotates clockwise in gesture 3, the direction of the static unbalance amount of the crankshaft 6 to be measured is 225 DEG in fig. 3, the direction of the crankshaft 6 to be measured is anticlockwise in gesture 4, and the direction of the crankshaft 6 to be measured is 315 DEG in the direction of the anticlockwise direction of the crankshaft 6 to be measured in gesture 3;
step five: the magnetic weight 5 manufactured in the first step is adsorbed and fixed on the direction of 180 degrees opposite to the static unbalance of the crankshaft 6 to be tested;
step six: rotating the crankshaft 6 to be tested again to the direction corresponding to the gesture with the highest rotation speed in the fourth step;
step seven: as shown in fig. 8 to 9, if the rotation direction of the crankshaft 6 to be measured is changed, the static unbalance amount of the crankshaft 6 to be measured is qualified, and otherwise, the static unbalance amount is not qualified.
Further, in the first step, the magnetic weights 5 may be manufactured according to the static unbalance tolerance, the magnetic weights 5 manufactured in a grading manner are formed by combining a plurality of small magnetic weights, and the weights of the magnetic weights 5 obtained by calculation can be obtained by combining different numbers of the small magnetic weights. The weight of the calculated magnetic weight 5 is greater than or less than the calculated weight of the magnetic weight 5 to meet the above measurement requirement, the static unbalance range 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 gravity center eccentric range of the crankshaft 6 to be measured is calculated according to the static unbalance range of the crankshaft 6 to be measured, for example, the weight of the crankshaft 6 to be measured is 10kg, the static unbalance is 50 g.cm-100 g.cm, the gravity center eccentric of the crankshaft 6 to be measured is 50 g.cm-100 g.cm/10 kg=0.05 mm-0.10 mm, and the processing procedure is convenient to 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 characteristics 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. A measuring method of a crankshaft static unbalance measuring device is characterized in that: the measuring device comprises a bottom plate (1), magnetic weights (5), two supports (2) and four rollers (3), wherein the two supports (2) are fixed on the bottom plate (1) in parallel, each support (2) is provided with two rollers (3) in a rotating mode at the top, an interval is reserved between the two rollers (3), the four rollers (3) are arranged in a rectangular mode and can bear two ends of a crankshaft (6) to be measured at the same height, the crankshaft (6) to be measured can rotate on the four rollers (3) by taking the axis of the crankshaft (3) as the center, the magnetic weights (5) can be adsorbed and fixed on the crankshaft (6) to be measured, and the measuring method comprises the following steps:
step one: calculating the weight of the magnetic weight (5) through 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, and respectively adjusting the reference to four postures of 90 degrees vertical upwards, 0 degrees horizontal direction, 45 degrees inclined upwards and 135 degrees inclined upwards 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 static unbalance of the crankshaft (6) to be measured according to the gesture with the highest rotation speed in the four gestures and the corresponding rotation direction;
step five: the magnetic weight (5) manufactured in the first step is adsorbed and fixed on the direction of 180 degrees opposite to the static unbalance of the crankshaft (6) to be tested;
step six: rotating the crankshaft (6) to be tested to the direction corresponding to the gesture with the highest rotation speed in the fourth step again;
step seven: if the rotation direction of the crankshaft (6) to be tested is changed, the static unbalance of the crankshaft (6) to be tested is qualified, otherwise, the static unbalance is disqualified.
2. The measurement method of a crankshaft static unbalance measurement device according to claim 1, characterized in that: two pin shafts (4) are horizontally fixed at the top of the support (2), and the idler wheels (3) are coaxially and rotatably arranged on the corresponding pin shafts (4) through bearings.
3. The measurement method of a crankshaft static unbalance measurement device according to claim 1, characterized in that: in the first step, the magnetic weights (5) are manufactured according to static unbalance tolerance grading, the graded magnetic weights (5) are formed by combining a plurality of small magnetic weights, and the weights of the magnetic weights (5) with 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.
4. A measuring method of a crankshaft static unbalance measuring device according to claim 1 or 3, characterized in that: and step three, after a reference is selected, a reference line (7) is drawn on the surface of the crankshaft (6) to be tested.
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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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| CN114046934A CN114046934A (en) | 2022-02-15 |
| CN114046934B true CN114046934B (en) | 2023-09-22 |
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| JPS63186120A (en) * | 1987-01-29 | 1988-08-01 | Shimadzu Corp | Method for measuring unbalance of crank shaft |
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| CN104502023A (en) * | 2014-12-17 | 2015-04-08 | 天润曲轴股份有限公司 | Crankshaft dynamic balance testing and calibration method |
| WO2017186062A1 (en) * | 2016-04-29 | 2017-11-02 | 郭卫建 | Method for obtaining position of mass centre of unbalanced weight |
| CN109341952A (en) * | 2018-10-09 | 2019-02-15 | 上海大众动力总成有限公司 | A kind of dynamically balanced dynamic adjustment central hole location degree method of raising engine crankshaft |
| 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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2021
- 2021-10-28 CN CN202111280121.2A patent/CN114046934B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63186120A (en) * | 1987-01-29 | 1988-08-01 | Shimadzu Corp | Method for measuring unbalance of crank shaft |
| JP2004045386A (en) * | 2002-05-16 | 2004-02-12 | Kokusai Keisokki Kk | Apparatus and method for testing rotary balance of crankshaft |
| EP1870181A1 (en) * | 2006-06-22 | 2007-12-26 | Peugeot Citroen Automobiles SA | Method of manufacturing a crankshaft |
| CN201680947U (en) * | 2010-05-13 | 2010-12-22 | 上海申联试验机厂有限公司 | Crankshaft equilibrator |
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| CN102172779A (en) * | 2010-12-31 | 2011-09-07 | 哈尔滨东安汽车动力股份有限公司 | Fully-automatic balancing weight reducing machine tool process and computing method thereof |
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| CN103292960A (en) * | 2013-06-17 | 2013-09-11 | 第一拖拉机股份有限公司 | Operation method for internal combustion engine crankshaft balancing mechanism with preset amount of unbalance |
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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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