CN113405435B - Measuring method for rapidly detecting deflection of pulley steel cable - Google Patents
Measuring method for rapidly detecting deflection of pulley steel cable Download PDFInfo
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- CN113405435B CN113405435B CN202110531423.6A CN202110531423A CN113405435B CN 113405435 B CN113405435 B CN 113405435B CN 202110531423 A CN202110531423 A CN 202110531423A CN 113405435 B CN113405435 B CN 113405435B
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- pulley
- steel cable
- deflection
- steel
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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
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
Abstract
The utility model belongs to the technical field of aviation measurement, and relates to a measurement method for rapidly detecting deflection of pulley steel cables. The utility model can rapidly determine the separation point of the steel cable and the pulley groove and the size of the separation point of the steel cable distance. The portable detection tool is clamped on the pulley rotating shaft, the side face of the detection tool is tightly attached to the outer side face of the pulley, the deflection displacement of the steel rope from the pulley groove separation point is converted into the deflection displacement of the steel rope separation point to the detection tool, the steel rope separation point, the steel rope and the detection tool form a triangular relationship, the thickness of the pulley and the diameter of the steel rope are known, the detection length of the detection tool is obtained through conversion of the triangular function relationship, and the deflection of the pulley steel rope can be judged to be not more than 2 degrees only if the inner side face of the length range of the detection tool is not contacted with the steel rope. The method is suitable for judging and detecting pulleys and steel ropes of different types and specifications of various systems.
Description
Technical Field
The utility model belongs to the technical field of aviation measurement, and relates to a measurement method for rapidly detecting deflection of pulley steel cables.
Background
During the installation and debugging process of the control system, the Y9 type platform aircraft needs to detect whether the deflection of the pulley passing steel cable on the aircraft relative to the pulley groove symmetry plane meets the requirements: the technical requirement is that the center line of the steel cable should coincide with the pulley groove plane. The allowable deflection of the steel rope to the pulley groove symmetry plane should not exceed 2 degrees, namely, the point A on the steel rope, which is 100mm far away from the separation point of the steel rope and the pulley groove, is pulled to the pulley groove symmetry plane, and when the center line of the steel rope is coincident with the pulley groove symmetry plane, the displacement of the point A should not be more than 3.5mm. Because the symmetrical plane of the pulley groove and the offset angle of the central line of the steel cable form a three-dimensional space position in the installation process, the separation point of the steel cable and the pulley groove is a variable, the separation points of the steel cables with different winding shapes on the pulleys are different, and an accurate relative measurement base point cannot be determined on an airplane.
The utility model discloses a pulley steel cable deflection measuring instrument, which is disclosed in China patent publication No. CN109827496A, publication No. 2019, and publication No. 05 and 31, wherein an L-shaped deflector rod is rotatably arranged on a deflector rod turntable, a dial is rotatably arranged on the deflector rod, the dial can be shown when the L-shaped deflector rod rotates, the initial position of the L-shaped deflector rod is positioned on the symmetrical plane of a pulley groove, and whether the deflection degree of the central part of a steel cable and the symmetrical plane of the pulley groove meets the deflection requirement is checked in a dial degree mode through mechanical deflection. The disadvantages (drawbacks) are: 1. the measuring instrument is complex to manufacture and assemble, high in precision requirement and high in cost, and 2, the measuring is completed through a complex calculation process, so that whether the deflection of the steel cable meets the requirement cannot be intuitively judged.
Disclosure of Invention
1.1, technical requirement the cable centreline should coincide with pulley groove plane. The allowable deflection of the rope to the pulley groove symmetry plane should not exceed 2 deg., i.e. the point on the rope 100mm away from the point of separation of the rope from the pulley groove should be no more than 3.5mm from the pulley groove symmetry plane.
1.2, because the symmetrical plane of the pulley groove and the offset angle of the central line of the steel cable form a three-dimensional space position in the installation process, the separation point of the steel cable and the pulley groove is a variable, the separation points of the steel cables with different winding shapes on the pulleys are different, an accurate relative measurement base point cannot be determined on an airplane, and the specific offset point position cannot be determined.
Technical proposal
A measuring method for rapidly detecting the deflection of a pulley steel cable comprises the following steps:
2.1, determination of the separation point of the steel rope and the pulley groove: according to the utility model, through analysis, no matter how the steel cable is wound, the separation point of the steel cable and the pulley groove is always on the central axis of the pulley, and the separation point of the steel cable, namely the pulley tangential point, is obtained.
2.2, because the deflection angle of the steel cable on the machine can not be directly measured, the utility model is a method for reversely pushing whether the deflection amount of the steel cable relative to the symmetrical plane of the pulley groove meets the requirement by converting the maximum deflection angle of the steel cable to the symmetrical plane of the pulley groove by 2 degrees into the length of the contact point of the steel cable to the pulley groove from the separation point of the pulley side, and according to the separation point of the steel cable, namely the pulley contact point, the measuring position of the separation point of the steel cable from the pulley groove can be converted into the measuring position of the center of the pulley shaft, and because the distance of the steel cable from the center of the pulley shaft and the pulley size are limited, the auxiliary measurement is needed by a detection tool in order to ensure the deflection size of the deflection point of the steel cable from the center of the pulley shaft and the deflection point to the pulley side.
According to the pulley thickness H and the steel rope diameter d, the positions of the extending end length L of the detection tool, which are not contacted with the side surface of the steel rope, are obtained through trigonometric function relation conversion, and the detection tool is qualified.
The specific operation steps on the machine are as follows:
1) When the machine is started up for detection, the semicircular bayonet at the front end of the detection tool is clamped on the outer shaft of the pulley (as shown in figure 6)
2) Rotating the detection tool around the pulley shaft to the upper edge of the extending end of the tool and keeping parallel to the steel rope
3) Ensure that the side surface of the detection tool is tightly attached to the side surface of the pulley
4) Checking that if the side surface of the extending end of the detection tool is not contacted with the steel rope, the deflection of the steel rope to the symmetry plane of the pulley groove is not more than 2 degrees; if contacted, the rope proved to be deflected more than 2 ° from the pulley groove symmetry plane.
The measuring method is specifically as follows:
calculating the included angle between the contact point of the detection tool and the side surface of the steel cable and the maximum deflection angle of the steel cable by 2 DEG
cos2°≈0.999 ②
Pushing out from (2):
pushing out from (1) (2) (3):
the following steps are obtained: given the pulley thickness H and the wire diameter d, the wire deflection is determined to be less than 2 ° as long as the detection tool l=length does not contact the wire.
The radius R of the bayonet at the front section of the tool is the same as the radius R of the pulley shaft,
the height h from the upper edge of the detecting end of the detecting tool to the center of the rotating shaft should not be smaller than the radius of the steel cable plus the radius of the pulley inner wheel groove,
the height h1 from the lower edge of the detection end of the detection tool to the center of the rotating shaft is not greater than the radius of the inner wheel groove,
the extension end L of the detection tool can be calculated according to the thickness of the pulley and the diameter of the steel rope to be made into a fixed length or made into a sliding detection with a scale pattern,
the thickness can be fixed according to the actual condition of the space on the machine, and the pulley outer edge radius R1 is set according to the maximum outer circle radius of the pulley, so that the detection tool is convenient to detect when being attached to the pulley side face.
The height h from the upper edge of the detection end of the detection tool to the center of the rotating shaft=the height h1 from the lower edge of the detection end of the detection tool to the center of the rotating shaft plus the diameter of the steel cable.
Technical effects
1. The utility model can rapidly determine the size of the separation point between the steel cable and the pulley groove and the separation point between the steel cable and the pulley groove;
2. quickly determining a measurement datum point, and converting three-dimensional space measurement into two-dimensional plane measurement through a detection tool;
3. the utility model is suitable for judging and detecting pulleys and steel ropes with different types and specifications of various systems;
4. the auxiliary detection tool is simple to manufacture, low in cost, small and exquisite, portable and simple to operate;
5. one person can operate alone, and the measurement is performed immediately, so that the method is convenient and quick.
Drawings
FIG. 1 is a cable offset plot;
FIG. 2 is a graph of a wire rope separation point analysis;
FIG. 3 is a schematic measurement diagram;
FIG. 4 is a conversion chart of the measurement method;
1-pulley thickness H, 2-wire rope diameter d, inspection tool inspection end L
FIG. 5 is a diagram of a detection tool;
fig. 6 is a diagram of the use of the inspection tool.
Detailed Description
The utility model is described in further detail below with reference to fig. 1-6 and the detailed description:
determination of the separation point of the steel rope and the pulley groove: according to the utility model, through analysis, no matter how the steel cable is wound, the separation point of the steel cable and the pulley groove is always on the central axis of the pulley, and the separation point of the steel cable, namely the pulley tangential point, is obtained.
The utility model relates to a method for reversely pushing the allowable deflection quantity of a steel cable relative to a pulley groove symmetry plane to meet the requirement by converting the allowable deflection maximum angle 2 degrees of the steel cable to the pulley groove symmetry plane into the length of the contact point of the steel cable to the pulley side surface and the pulley groove separation point, wherein the measurement position of the steel cable from the pulley groove separation point can be converted into the measurement position of the steel cable from the pulley shaft center according to the steel cable separation point, namely the pulley contact point.
According to the pulley thickness H and the steel rope diameter d, the positions of the extending end length L of the detection tool, which are not contacted with the side surface of the steel rope, are obtained through trigonometric function relation conversion, and the detection tool is qualified.
1) The diameter of the steel rope is phi 3.6, and the thickness of the pulley is HB5-54-80 and 11mm.
When the steel cable deviates from the central line by 2 degrees, the center of the steel cable deviates by H/2 when a point which is L mm away from the separation point of the steel cable and the pulley groove on the steel cable just contacts with the detection tool; since the diameter of the steel cable is phi 3.6mm, the gap between the point on the steel cable, which is far from the separation point L mm of the steel cable and the pulley groove, and the plane is
I.e. the actual cable deflection of the point on the cable which is L mm away from the separation point of the cable from the pulley groove is less than 3.7mm from the detection tool contact point, according to L < 100 (H-d)/7=100 (11-3.6)/7=105.7, the length can be rounded, e.g. l=106 mm, for the detection tool production while improving the detection accuracy. So long as itThe detection tool does not contact the wire rope for a length of 106mm, i.e. the deflection of the wire rope does not exceed 2 °.
2) The diameter of the steel rope is phi 3, and the thickness of the pulley is HB5-54-70 and 10mm.
When the steel cable deviates from the central line by 2 degrees, the center of the steel cable deviates by H/2 when a point which is L mm away from the separation point of the steel cable and the pulley groove on the steel cable just contacts with the detection tool; since the diameter of the steel cable is phi 3.6mm, the gap between the point on the steel cable, which is far from the separation point L mm of the steel cable and the pulley groove, and the plane is
I.e. the actual cable deflection of the point on the cable which is L mm away from the point of separation of the cable from the pulley groove is less than 3.5mm from the point of contact of the detection tool, according to L < 100 (H-d)/7=100 (10-3)/7=100, as long as the detection tool does not contact the cable for a length of 100mm, i.e. the cable deflection does not exceed 2 °.
Claims (7)
1. The measuring method for rapidly detecting the deflection of the pulley steel cable is characterized by comprising the following steps of:
1) Determination of the separation point of the steel rope and the pulley groove: through analysis, no matter how the steel cable is wound, the separation point of the steel cable and the pulley groove is always on the central axis of the pulley, and the separation point of the steel cable, namely the pulley tangential point, is obtained;
2) Because the deflection angle of the steel cable on the machine cannot be directly measured, the maximum deflection angle of the steel cable to the symmetrical plane of the pulley groove is converted into the length of the steel cable deflection to the distance from the contact point of the pulley side surface to the pulley groove, whether the allowable deflection amount of the steel cable relative to the symmetrical plane of the pulley groove meets the requirement is reversely pushed, the measuring position of the steel cable from the pulley groove is converted into the measuring position of the steel cable from the center of the pulley shaft according to the steel cable separation point, namely the pulley contact point, the distance from the center of the steel cable from the pulley shaft and the pulley size are limited and cannot be directly measured, and auxiliary measurement is carried out by means of a detection tool in order to ensure the deflection dimension from the center distance from the steel cable deflection point to the pulley shaft and the deflection point to the pulley side surface;
according to the pulley thickness H and the steel cable diameter d, converting through a trigonometric function relationship to obtain the positions of the length L of the extending end of the detection tool, which are not contacted with the side surface of the steel cable, and obtaining the qualified positions; the specific operation steps on the machine are as follows:
1) When the machine is on-line for detection, the semicircular bayonet at the front end of the detection tool is clamped on the outer shaft of the pulley;
2) Rotating the detection tool around the pulley shaft until the upper edge of the extending end of the tool is parallel to the trend of the steel cable;
3) Ensuring that the side surface of the detection tool is tightly attached to the side surface of the pulley;
4) Checking that if the side surface of the extending end of the detection tool is not contacted with the steel rope, the deflection of the steel rope to the symmetry plane of the pulley groove is not more than 2 degrees, and if the side surface of the extending end of the detection tool is contacted with the steel rope, the deflection of the steel rope to the symmetry plane of the pulley groove is more than 2 degrees;
the measuring method is specifically as follows:
calculating the included angle between the contact point of the detection tool and the side surface of the steel cable and the maximum deflection angle of the steel cable by 2 DEG
cos2°≈0.999 ②
Pushing out from (2):
pushing out from (1) (2) (3):
the following steps are obtained: given the pulley thickness H and the wire diameter d, the wire deflection is determined to be less than 2 ° as long as the detection tool l=length does not contact the wire.
2. The method of claim 1, wherein the radius R of the front end of the inspection tool is the same as the radius of the pulley shaft.
3. The method of claim 1, wherein the height h from the upper edge of the detecting end of the detecting tool to the center of the rotating shaft is not smaller than the radius of the rope plus the radius of the groove in the pulley.
4. The method of claim 1, wherein the height h1 from the lower edge of the detecting end of the detecting tool to the center of the rotating shaft is not greater than the radius of the inner race.
5. A method of measuring a pulley cable deflection as in claim 1 wherein the measuring tool extension L is calculated to be either fixed length or scale-like slip based on the pulley thickness and cable diameter.
6. The method for measuring the deflection of the pulley steel cable according to claim 1, wherein the thickness of the pulley is fixed according to the actual condition of the space on the machine, and the radius R1 of the outer edge of the pulley is set according to the maximum outer circle radius of the pulley.
7. The method of claim 1, wherein the height h from the upper edge of the detecting means to the center of the shaft = the height h1 from the lower edge of the detecting means to the center of the shaft plus the diameter of the rope.
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| CN202110531423.6A CN113405435B (en) | 2021-05-14 | 2021-05-14 | Measuring method for rapidly detecting deflection of pulley steel cable |
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| CN113405435B true CN113405435B (en) | 2023-06-23 |
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2021
- 2021-05-14 CN CN202110531423.6A patent/CN113405435B/en active Active
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