CN109269437B - Detection method for braking belt of belt brake - Google Patents
Detection method for braking belt of belt brake Download PDFInfo
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- CN109269437B CN109269437B CN201810791539.1A CN201810791539A CN109269437B CN 109269437 B CN109269437 B CN 109269437B CN 201810791539 A CN201810791539 A CN 201810791539A CN 109269437 B CN109269437 B CN 109269437B
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- band
- braking
- brake
- brake band
- platform
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
Abstract
The invention discloses a method for detecting a brake band of a band brake, and belongs to the technical field of marine machinery. The detection method comprises the following steps: providing a platform, and drawing the outline of an action object of a brake band on the platform; placing the brake band on a platform, wherein the projection of at least one point on the action surface of the brake band on the platform is superposed with the contour of an action object of the brake band, and the projections of other points on the action surface of the brake band on the platform are positioned outside the contour of the action object of the brake band; dividing the braking band into a plurality of sections, wherein the arc length of each section of the braking band is less than or equal to a set length; measuring the maximum distance between the projection of the two ends of each section of the braking band on the platform and the outline of an action object of the braking band; when the maximum values of the maximum distances measured by the brake belts at all sections are within the set range, determining that the brake belts are qualified; and determining that the braking belt is unqualified when at least one of the maximum values of the maximum distances measured by the braking belts in each section is out of the set range. The invention can realize the detection of the brake band.
Description
Technical Field
The invention relates to the technical field of marine machinery, in particular to a method for detecting a braking belt of a belt brake.
Background
Windlass (english) is a mechanical device used for ship mooring and anchor dropping, and is usually installed on the main deck of the ship head and tail for receiving and releasing anchor and anchor chain (or cable). The band brake is an important component of the windlass and produces a braking effect by means of the contraction of the braking band around the brake wheel of the windlass. The rationality of the design of the band brake and the accuracy of manufacture directly affect the reliability of the use of the windlass.
The band brake mainly comprises a brake drum, a brake band, a hydraulic cylinder, a piston and the like. If the brake band is not manufactured properly, the actual radian of the brake band can deviate from the designed theoretical radian seriously, so that a larger gap exists between the brake band and a brake wheel of the anchor lifter or the contact is uneven, and further, when the anchor lifter is operated in a braking mode, the brake band cannot hold the brake wheel of the anchor lifter tightly, the rotation of the anchor lifter cannot be stopped in time by the band brake, and the potential safety hazards of breaking off of an anchor chain and galloping of a vehicle exist. Therefore, designing a braking band with an appropriate arc is the basis for safe operation of the windlass, and manufacturing a braking band with a precise arc is the key for safe operation of the windlass.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
at present, the brake band can be optimally designed through theoretical calculation or a finite element simulation mode, and the brake band with proper radian can be completely designed. However, the brake band manufactured by design currently lacks a recognized and feasible method for detection, and cannot determine whether to manufacture a brake band with accurate radian.
Disclosure of Invention
The embodiment of the invention provides a method for detecting a braking belt of a belt brake, which can solve the problems that the prior art lacks a recognized and feasible method for detecting the braking belt of the belt brake and cannot determine the manufacturing accuracy of the braking belt. The technical scheme is as follows:
the embodiment of the invention provides a method for detecting a braking belt of a belt brake, which comprises the following steps:
providing a platform, wherein the platform is drawn with the outline of an action object of a brake band;
placing the braking band on the platform, wherein the projection of at least one point on the action surface of the braking band on the platform is superposed with the contour of the action object of the braking band, and the projection of other points on the action surface of the braking band on the platform is positioned outside the contour of the action object of the braking band;
dividing the braking band into a plurality of sections, wherein the arc length of each section of the braking band is less than or equal to a set length;
measuring the maximum distance between the projection of the two ends of each section of the braking belt on the platform and the outline of the action object of the braking belt;
when the maximum value of the maximum distance measured by each section of the braking belt is within a set range, determining that the braking belt is qualified;
determining that the braking band is disqualified when at least one of the maximum values of the maximum distances measured by the braking band for each segment is outside a set range.
Optionally, said dividing said braking band into a plurality of segments comprises:
the brake band is segmented from both ends of the brake band to the middle of the brake band.
Optionally, the measuring a maximum distance between a projection of both ends of each segment of the braking band on the platform and a contour of an acting object of the braking band includes:
drawing a connecting line between the end part of the brake band and the center of the contour of the action object of the brake band on the platform to obtain an intersection point of the connecting line and the contour of the action object of the brake band;
setting the corner of the ruler with the right angle on the intersection point;
and measuring the maximum gap between the braking belt and the ruler with the right angle by using a ruler with the length measurement, and taking the maximum gap as the maximum distance between the projection of the end part of the braking belt on the platform and the contour of the action object of the braking belt.
Optionally, when one end of a segment of the braking band is an end point of the whole braking band, the detection method further includes:
selecting at least one measuring line on the action surface of the brake band, wherein connecting lines of all points on the same measuring line and the center of the contour of an action object of the brake band are on the same plane vertical to the horizontal plane;
measuring the maximum distance between the projection of the point on each of the measuring lines on the platform and the contour of the acting object of the braking band.
Optionally, when the maximum distance between the projection of the middle of a segment of the braking band on the platform and the contour of the acting object of the braking band is greater than the maximum distance between the projection of the two ends of the braking band on the platform and the contour of the acting object of the braking band, the detection method further includes:
selecting at least one measuring line on the action surface of the brake band, wherein connecting lines of all points on the same measuring line and the center of the contour of an action object of the brake band are on the same plane vertical to the horizontal plane;
measuring the maximum distance between the projection of the point on each of the measuring lines on the platform and the contour of the acting object of the braking band.
Optionally, when the maximum distance between the projections of the two ends of the braking band on the platform and the contour of the action object of the braking band is outside the set range, the detection method further includes:
selecting at least one measuring line on the action surface of the brake band, wherein connecting lines of all points on the same measuring line and the center of the contour of an action object of the brake band are on the same plane vertical to the horizontal plane;
measuring the maximum distance between the projection of the point on each of the measuring lines on the platform and the contour of the acting object of the braking band.
Optionally, when one end of a segment of the braking band is an end point of the whole braking band, the detection method further includes:
determining that the braking band is disqualified when at least one of the minimum values of the maximum distances measured by the braking band for each segment is outside the set range.
Optionally, the detection method further includes:
measuring the height of the protrusion or the depth of the depression on the active surface of the braking band;
when the height of the bulge or the depth of the recess on the action surface of the brake band is smaller than or equal to a set threshold value, determining that the brake band is qualified;
and when the height of the bulge or the depth of the depression on the action surface of the brake band is greater than a set threshold value, determining that the brake band is unqualified.
Optionally, after determining that the braking band is unqualified, the detection method further comprises:
and baking the outer side of the brake band by adopting flame, and correcting the brake band.
Optionally, after determining that the braking band is unqualified, the detection method further comprises:
and a pressure reducing jack is adopted to act on the outer side of the brake band to correct the brake band.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the method comprises the steps of providing a platform with a drawn contour of an action object of a brake band, placing the brake band on the platform, enabling projection of at least one point on an action surface of the brake band on the platform to coincide with the contour of the action object of the brake band, enabling projection of other points on the action surface of the brake band on the platform to be located outside the contour of the action object of the brake band, dividing the brake band into a plurality of sections with arc lengths smaller than or equal to a set length, measuring the maximum distance between projection of two ends of each section of the brake band on the platform and the contour of the action object of the brake band, determining whether the brake band is qualified according to the fact that whether the measured maximum distance is within a set range, detecting manufacturing accuracy of the brake band, avoiding the unqualified brake band from being installed on a brake wheel, and guaranteeing effectiveness of anchor machine braking.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a brake band of a band brake according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting a braking band of a band brake according to an embodiment of the present invention;
FIG. 3 is a side view of a platform outlining an active object having a braking band provided by an embodiment of the present invention;
FIG. 4 is a top view of a platform outlined with an active object of a braking band provided by an embodiment of the present invention;
FIG. 5 is a side view of a platform with a brake band positioned therein according to an embodiment of the present invention;
FIG. 6 is a top view of a platform with a brake band positioned therein according to an embodiment of the present invention;
FIG. 7 is a schematic illustration of the present invention with both ends of the brake band segmented;
FIG. 8 is a schematic illustration of the present invention with both ends of the brake band segmented;
FIG. 9 is a schematic view of the measurement of the straight edge with the maximum clearance between the braking band and the square at different positions as provided by the embodiment of the invention;
FIG. 10 is a schematic view of the measurement of the straight edge with the maximum clearance between the braking band and the square at different positions provided by embodiments of the invention;
FIG. 11 is a schematic view of a measurement of a straightedge with a depression in the brake band provided by an embodiment of the present invention;
FIG. 12 is a schematic view of a measurement of a straightedge with a projection on the brake band provided by an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a brake mechanism controlling a brake band according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The structure of the band brake band applied to the method for detecting the band brake band provided by the embodiment of the invention is described below with reference to fig. 1.
Fig. 1 is a schematic structural diagram of a braking band of a band brake provided in an embodiment of the present invention. Referring to fig. 1, the braking band 10 includes at least one segment of braking band 11, and the braking band 11 is arc-shaped to be sleeved outside the braking wheel 20 of the windlass, so that the braking wheel 20 is locked during the braking operation of the windlass, thereby achieving the braking effect. When the brake band 10 includes at least two brake bands 11, the at least two brake bands 11 can be connected in sequence, and the centers of the brake bands 11 coincide, so as to achieve the same effect as the whole brake band 11 (the arc length of the whole brake band 11 is equal to the sum of the arc lengths of the at least two brake bands 11).
Specifically, both ends of each section of brake band 11 are provided with connecting ear plates 12, and the connecting ear plates 12 are provided with pin holes 13. The pin hole 13 in one connecting lug plate 12 on one section of brake band 11 is aligned with the pin hole 13 in one connecting lug plate 12 on the other section of brake band 11, and a pin shaft is inserted into the two aligned pin holes 13, so that the two sections of brake bands 11 can be hinged together. For example, the brake band shown in fig. 1 comprises two brake bands 11, respectively referred to as first brake band and second brake band; the two ends of the two-end brake band 11 are respectively provided with a connecting ear plate 12 which is respectively called as a first connecting ear plate and a second connecting ear plate; the connecting lug plate 12 is provided with a pin hole 13. The pin holes 13 formed in the second connecting lug plate of the first brake band are aligned with the pin holes 13 formed in the first connecting lug plate of the second brake band, and the pin shafts are inserted into the two aligned pin holes 13, so that the first brake band can be hinged to the second brake band.
In practical applications, as shown in fig. 1, the pin hole 13 is usually opened on the connecting ear plate 12 near the end of the brake band 11, and the width W of the connecting ear plate 12 can be gradually reduced from the end of the brake band 11 to the middle of the brake band 11, so as to optimize the strength of the connecting ear plate.
In addition, the attachment ears 12 at both ends A, B of brake band 10 are adapted to be connected to a braking mechanism and to reduce or increase the distance D between the ends A, B of brake band 10 under the action of the braking mechanism. If the distance D between the two ends A, B of the braking band 10 is reduced, the braking band 10 is tightened to lock the braking wheel 20 for braking; if the distance D between ends A, B of braking band 10 is increased, braking band 10 is released and braking wheel 20 can rotate normally.
In the specific implementation, when brake band 10 includes a length of brake band 11, connecting ear plates 12 disposed at two ends of brake band 11 are connecting ear plates 12 at two ends A, B of brake band 10. When brake band 10 includes at least two segments of brake bands 11, the connecting lugs 12 at the ends of two brake bands 11 not connected to other brake bands 11 are the connecting lugs 12 at both ends A, B of brake band 10. Also exemplified in the brake band of fig. 1, the first engaging lug of the first brake band and the second engaging lug of the second brake band are the engaging lugs 12 at both ends A, B of brake band 10, respectively.
In practical applications, a hanging member, such as an ear plate with a through hole, may be disposed at the middle of the braking band 11 to facilitate the movement of the braking band.
The embodiment of the invention provides a method for detecting a brake band of a band brake, which is suitable for detecting the brake band of the band brake shown in figure 1. Fig. 2 is a flowchart of a method for detecting a braking band of a band brake according to an embodiment of the present invention, and referring to fig. 2, the method includes:
step 101: a platform is provided.
In this embodiment, the platform is outlined with the acting object of the braking band. Specifically, the platform is painted with the contour of the brake wheel of the windlass. Because the band brake utilizes the tightening of brake band and locks the braked wheel when carrying out the braking to the windlass, consequently detect the brake band on the platform of the profile of drawing the braked wheel, be favorable to confirming the braking effect of brake band, and then confirm the accuracy nature that the brake band was made.
Fig. 3 is a side view of a platform outlining an active object with a braking band in accordance with an embodiment of the present invention. Referring to fig. 3, the upper surface of the platform 30 is a plane parallel to the horizontal plane, so that the acting object of the braking band can be drawn on the platform, and meanwhile, the occurrence of detection errors can be avoided, and the detection accuracy is improved. Fig. 4 is a top view of a platform for outlining an object of action of a braking band according to an embodiment of the present invention, and referring to fig. 4, the upper surface of the platform 30 is outlined with a braking wheel 20.
Optionally, before the step 101, the detecting method may further include:
and drawing the outline of the action object of the braking band on the platform.
When the band brake braking band is detected for the first time, a platform for drawing the outline of the braking object with the braking band does not exist, so that the platform needs to be found first, the outline of the acting object of the braking band is drawn on the platform, the platform for drawing the outline of the braking object with the braking band is obtained, and the band brake braking band is detected. When the band brake band is detected again after the band brake band is detected for the first time, the band brake band may be detected directly using the platform on which the contour of the braking object of the brake band is drawn, which is obtained when the band brake band is detected for the first time.
In a specific implementation, the brake band is in the shape of an arc, so that the contour of the target of the brake band is specifically a circle with a certain radius or diameter. When the contour of the acting object of the brake band is drawn on the platform, the size (diameter or radius) of the acting object of the brake band can be obtained first, and then the circle is drawn on the platform according to the obtained size to form the contour of the acting object of the brake band.
For example, a measuring point is selected at the edge of an action object of the brake band, and the starting end of the length measuring tool is fixed on the measuring point; moving the length measuring tool, finding out the maximum value in the distance between the measuring point and each point on the edge of the action object of the brake band, and taking the found maximum value as the diameter of the action object of the brake band; and according to a conversion formula between the diameter and the radius of the circle, the radius of the acting object of the braking belt is obtained from the diameter of the acting object of the braking belt, so that the size of the acting object of the braking belt is obtained.
Then, selecting a fixed point on the platform, and fixing one end of the rope on the fixed point; straightening the rope, selecting a moving point on the rope, wherein the length of the rope between the moving point and the fixed point is equal to the radius of an acting object of the brake band; and in the process of rotating the moving point, drawing the motion trail of the moving point on the platform by adopting a drawing tool, thereby forming the outline of an action object of the brake band on the platform according to the obtained size.
Step 102: the brake band is placed on the platform.
In this embodiment, the projection of at least one point on the application surface of the braking band on the platform coincides with the contour of the application object of the braking band, and the projections of the other points on the application surface of the braking band on the platform lie outside the contour of the application object of the braking band. The other points on the acting surface of the brake band are points other than the points of the working surface of the brake band, the projection of which on the platform coincides with the contour of the acting object of the brake band.
In practical applications, when the brake band comprises at least two segments of brake band, only one segment of brake band can be placed on the platform at a time for testing. When a section of brake band is placed on the platform, the brake band can be moved, so that the projection of the middle point of the brake band on the platform is superposed with the contour of the action object of the brake band, and the projections of the two ends of the brake band on the platform are positioned outside the contour of the action object of the brake band, thereby quickly placing the brake band on the proper position of the platform. It is also possible to move the brake band so that the two ends of the brake band are as close as possible to the contour of the object of action of the brake band and the distance between the two ends of the brake band and the center of the contour of the object of action of the brake band is equal to place the brake band in the right position on the platform.
Fig. 5 is a side view of a platform with a brake band placed thereon according to an embodiment of the present invention, and referring to fig. 5, brake band 10 is placed on the upper surface of platform 30. Fig. 6 is a top view of a platform with a braking band placed thereon according to an embodiment of the present invention, and referring to fig. 6, the projection of the point at the middle of braking band 10 on platform 30 coincides with the contour of braking wheel 20, and the projection of the points at the two ends of braking band 10 on platform 30 is outside the contour of braking wheel 20.
Since the braking band acts on the acting object from the outside of the acting object, the braking band is normally located outside the acting object. If the projection of at least one point on the action surface of the brake band on the platform is located in the contour of the action object of the brake band, which is inconsistent with the actual situation, the placement position of the brake band needs to be adjusted until the projection of at least one point on the action surface of the brake band on the platform is overlapped with the contour of the action object of the brake band, and the projection of other points on the action surface of the brake band on the platform is located outside the contour of the action object of the brake band.
If the projections of at least one point on the application surface of the brake band on the platform lie within the contour of the application object of the brake band in the case of a projection of at least one point on the application surface of the brake band on the platform in all the placement positions on the platform of the brake band coinciding with the contour of the application object of the brake band, this indicates that there is a problem with the manufacture of the brake band or that there is a problem with the drawing of the contour of the application object of the brake band. A further check can be made at this point to determine whether there is a problem with the manufacture of the brake band or a problem with the drawing of the contour of the acting object of the brake band.
In one implementation of this embodiment, the length measuring tool may be used to detect whether the distance between the center (i.e., the fixed point) of the contour of the acting object of the braking band and each point on the contour of the acting object of the braking band is equal to the radius of the acting object of the braking band; if the distance between the center of the contour of the action object of the braking band and at least one point on the contour of the action object of the braking band is not equal to the radius of the action object of the braking band, determining that the drawing of the contour of the action object of the braking band has a problem, and modifying the contour of the action object of the braking band drawn on the platform or redrawing the contour of the action object of the braking band on the platform; otherwise, if the distance between the center of the contour of the action object of the braking band and all points on the contour of the action object of the braking band is equal to the radius of the action object of the braking band, it is determined that the drawing of the contour of the action object of the braking band is not problematic, and that there is a problem with the manufacture of the braking band. The realization method has high accuracy of judgment results.
In practical application, after the contour of the action object of the braking band is drawn on the platform, whether the drawing of the contour of the action object of the braking band has a problem can be determined directly by adopting the implementation mode. If it is determined that there is no problem with the drawing of the outline of the action object of the braking band, the braking band is again placed on the platform. In this way, if in all the positions of placement of the braking band on the platform, in the case where the projection of at least one point on the application surface of the braking band on the platform coincides with the contour of the object of action of the braking band, and the projection of at least one point of the other points on the application surface of the braking band on the platform lies within the contour of the object of action of the braking band, it is possible to eliminate the case where the drawing of the contour of the object of action of the braking band is problematic, and it is directly determined that there is a problem with the manufacture of the braking band.
For another example, the length measuring tool may be further adapted to detect whether a distance between a point on the action surface of the brake band, which is projected on the platform and located within the contour of the action object of the brake band, and a center (i.e., a fixed point) of the contour of the action object of the brake band is smaller than a radius of the action object of the brake band; determining that there is a problem with the manufacture of the braking band if the distance between the point on the active surface of the braking band that the projection on the platform lies within the contour of the object of action of the braking band and the center of the contour of the object of action of the braking band is less than the radius of the object of action of the braking band; conversely, if the distance between the point on the active surface of the braking band, whose projection on the platform lies within the contour of the object of action of the braking band, and the center of the contour of the object of action of the braking band is greater than or equal to the radius of the object of action of the braking band, it is determined that there is a problem in the drawing of the contour of the object of action of the braking band. This implementation is simpler and more convenient in operation.
Optionally, the detection method may further include:
measuring distances a and b between two ends of the braking band and a symmetrical axis of the braking band, and distances c and d between two ends of the braking band and a perpendicular line of the symmetrical axis of the braking band, wherein the symmetrical axis of the braking band and the perpendicular line of the symmetrical axis of the braking band intersect at the center of the contour of an action object of the braking band;
the distance between the two ends of the braking band and the axis of symmetry of the braking band is compared with a first theoretical value and the distance between the two ends of the braking band and the perpendicular to the axis of symmetry of the braking band is compared with a second theoretical value.
It can be preliminarily determined that there is a problem in the manufacture of the brake band if the difference between the distance between the one end of the brake band and the symmetry axis of the brake band and the first theoretical value is outside the set range or the difference between the distance between the one end of the brake band and the perpendicular to the symmetry axis of the brake band and the second theoretical value is outside the set range. Conversely, if the difference between the distance between the two ends of the braking band and the axis of symmetry of the braking band and the first theoretical value is within the set range and the distance between the two ends of the braking band and the perpendicular to the axis of symmetry of the braking band and the second theoretical value is within the set range, it can be preliminarily determined that there is no problem in the manufacture of the braking band.
In practical application, the symmetry axis and the perpendicular line of the symmetry axis can be drawn on the platform in advance, the braking band is placed on the platform according to the symmetry axis and the perpendicular line of the symmetry axis, and the distances a and b between the two ends of the braking band and the symmetry axis of the braking band and the distances c and d between the two ends of the braking band and the perpendicular line of the symmetry axis of the braking band are measured.
When the brake band comprises at least two brake bands, the distances a, b between the ends of the brake bands and the symmetry axis of the brake bands, and the distances c, d between the ends of the brake bands and the perpendicular to the symmetry axis of the brake bands (see fig. 6) can be measured by placing only one brake band on the platform at a time.
Step 103: the braking band is divided into a plurality of segments.
In this embodiment, the arc length of each band is less than or equal to the set length. The braking belt is divided into a plurality of sections with radian not exceeding the set length, so that different positions on the braking belt can be detected respectively, and the accuracy of the detection result is improved.
Specifically, the set length may be 40mm to 60mm, preferably 50 mm. On one hand, the excessive number of the divided sections and the overlarge workload caused by the too short set length can be avoided; on the other hand, the detection result is not accurate due to the fact that the set length is too long and partial position omission is caused.
In practical applications, the brake band can be segmented from both ends of the brake band to the middle of the brake band, i.e. the arc length of the segmented both ends of the brake band is equal to the set length. When the brake band comprises at least two sections of brake bands, the two ends of the brake band are segmented to the middle of the brake band, and the arc length of the segmented two ends of the brake band is equal to the set length.
Fig. 7 and 8 are schematic diagrams of the two ends of the brake band being segmented according to the embodiment of the present invention, referring to fig. 7 and 8, the arc length of the two ends of the brake band 11 after being segmented is equal to the set length L.
Step 104: the maximum distance S (shown in fig. 7 and 8) between the projections of the two ends of each band on the platform and the contour of the object of action of the band is measured.
In this embodiment, the maximum distance between the projection of the end of the braking band on the platform and the contour of the acting object of the braking band is the maximum distance between the intersection point of the connecting line between the end of the braking band and the center of the contour of the acting object of the braking band and the projection of the end of the braking band on the platform.
In practical application, a connecting line between the end of the brake band and the center of the contour of the action object of the brake band can be drawn on the platform, so that an intersection point between the connecting line between the end of the brake band and the center of the contour of the action object of the brake band and the contour of the action object of the brake band is obtained; then, the corner of the square (or the right-angle triangle) is arranged on the intersection point of the connecting line of the end part of the brake belt and the center of the contour of the action object of the brake belt and the contour of the action object of the brake belt; and finally, measuring the maximum gap between the brake band and the square by using a ruler (or a vernier caliper), namely the maximum distance between the projection of the end part of the brake band on the platform and the contour of an action object of the brake band.
Fig. 9 and 10 are schematic views of measurements of the straight edge at different positions of the maximum clearance between the braking band and the square provided by embodiments of the invention. Referring to fig. 9 and 10, the corner of the square 40 is located on the contour of the brake wheel 20, and the end of the square 40 parallel to the horizontal plane extends away from the brake band 10, and the end of the square 40 perpendicular to the horizontal plane extends away from the platform 30. The maximum clearance between the braking band and the square can be obtained by moving the starting point of the straight edge 50 up and down against the active surface of the braking band 10.
Optionally, when one end of one segment of the brake band is an end point of the whole brake band, the detection method may further include:
selecting at least one measuring line on the action surface of the section of the brake band, wherein connecting lines of all points on the same measuring line and the center of the outline of an action object of the brake band are on the same plane vertical to the horizontal plane;
the maximum distance between the projection of the point on each measuring line on the platform and the contour of the object of action of the braking band is measured.
Because the maximum distance between the projection of the end point of the whole braking band on the platform and the outline of the action object of the braking band is usually larger, the measuring line is additionally added, and the detection accuracy is favorably improved.
The maximum distance between the projection of the point on the measuring line on the platform and the contour of the action object of the brake band is the maximum distance between the intersection point of the plane where the connecting line of each point on the measuring line and the center of the contour of the action object of the brake band is located and the contour of the action object of the brake band and the projection of each point on the measuring line on the platform.
In practical application, a connecting line of a point on a measuring line, which is intersected with the platform, and the center of the contour of the action object of the brake band is drawn on the platform, so that the intersection point of a plane, in which the connecting line of each point on the measuring line and the center of the contour of the action object of the brake band is located, and the contour of the action object of the brake band is obtained; then, the corner of the square (or the right-angle triangle) is arranged on the intersection point of the plane where the connecting line of each point on the measuring line and the center of the contour of the action object of the brake band is located and the contour of the action object of the brake band; and finally, measuring the maximum gap between the brake band and the square by using a ruler (or a vernier caliper), namely the maximum distance between the projection of the point on the measuring line on the platform and the contour of the action object of the brake band.
Optionally, when the maximum distance between the projection of the middle of a section of the braking band on the platform and the contour of the acting object of the braking band is greater than the maximum distance between the projection of the two ends of the section of the braking band on the platform and the contour of the acting object of the braking band, the detection method may further include:
selecting at least one measuring line on the action surface of the section of the brake band, wherein connecting lines of all points on the same measuring line and the center of the outline of an action object of the brake band are on the same plane vertical to the horizontal plane;
the maximum distance between the projection of the point on each measuring line on the platform and the contour of the object of action of the braking band is measured.
The distance between the middle part and the outline of the action object of the brake band is larger, so that the measurement of the middle part is correspondingly increased, and the detection accuracy is improved.
Optionally, when the maximum distance between the projections of the two ends of the braking band on the platform and the contour of the acting object of the braking band is outside the set range, the detection method may further include:
selecting at least one measuring line on the action surface of the section of the brake band, wherein connecting lines of all points on the same measuring line and the center of the outline of an action object of the brake band are on the same plane vertical to the horizontal plane;
the maximum distance between the projection of the point on each measuring line on the platform and the contour of the object of action of the braking band is measured.
If the maximum distance between the projections of the two ends of a section of the braking band on the platform and the contour of the acting object of the braking band is outside the set range, the section of the braking band may have problems in the whole section or just in the end section. When the unqualified brake band is corrected, the unqualified section in the brake band is usually corrected, so that the measurement of the middle part is correspondingly increased, and the correction accuracy is improved.
Step 105: and when the maximum value of the maximum distance measured by each section of the braking belt is within the set range, determining that the braking belt is qualified.
Step 106: and determining that the braking belt is unqualified when at least one of the maximum values of the maximum distances measured by the braking belts in each section is out of the set range.
The embodiment of the invention provides a platform for drawing the contour of an action object of a brake band, the brake band is placed on the platform, the projection of at least one point on the action surface of the brake band on the platform is superposed with the contour of the action object of the brake band, the projection of other points on the action surface of the brake band on the platform is positioned outside the contour of the action object of the brake band, the brake band is divided into a plurality of sections with arc length less than or equal to a set length, the maximum distance between the projection of two ends of each section of the brake band on the platform and the contour of the action object of the brake band is measured, whether the brake band is qualified or not is determined according to whether the measured maximum distance is in a set range, the detection of the manufacturing accuracy of the brake band is realized, the unqualified brake band can be prevented from being installed on a brake wheel, and the effectiveness of the anchor brake is ensured.
Optionally, when one end of one segment of the brake band is an end point of the whole brake band, the detection method may further include:
and determining that the braking band is unqualified when at least one of the minimum values of the maximum distances measured by each section of the braking band is out of the set range.
Since the maximum distance between the projection of the end point of the whole braking band on the platform and the contour of the action object of the braking band is usually larger, if the minimum value of the maximum distance measured by each section of the braking band is out of the set range, although the braking effect is not influenced, the normal operation of the braking wheel is influenced because the braking effect is too good.
Specifically, when one end of a section of the brake band is an end point of the whole brake band, the set range may be 1.5mm to 2.5 mm; when neither end of a segment of the braking band is an end point of the entire braking band, the set range may be 1mm or less.
Optionally, the detection method may further include:
measuring the height of the protrusion or the depth of the depression on the active surface of the braking band;
when the height of the bulge or the depth of the recess on the action surface of the brake band is less than or equal to a set threshold value, determining that the brake band is qualified;
and when the height of the bulge or the depth of the depression on the action surface of the brake band is greater than a set threshold value, determining that the brake band is unqualified.
Specifically, the set threshold may be 0.5 mm.
Because the convex or concave of the action surface of the braking belt can influence the braking effect of the braking belt, the measurement of the height of the convex or concave is increased, and the detection accuracy can be improved.
In practical application, the square (or the square) can be abutted against the brake band; if a gap exists between the square and the braking band, the braking band is provided with a bulge or a depression; and then measuring the maximum gap between the braking band and the square by using a ruler (or a vernier caliper), namely the height of the bulge or the depth of the depression.
Fig. 11 and 12 are schematic views of measurements taken with a straight edge with depressions and protrusions on the braking band, respectively, provided by an embodiment of the invention. Referring to fig. 11 and 12, square 40 is positioned against braking band 10 with the end of square 40 parallel to the horizontal plane extending away from braking band 10 and the end of square 40 perpendicular to the horizontal plane extending away from platform 30. The maximum clearance between the braking band and the square can be obtained by moving the starting point of the straight edge 50 up and down against the active surface of the braking band 10.
In practical applications, the detection method can be performed when the brake band is in a released state or in a tightened state, and at this time, the brake band needs to be tightened by using a brake mechanism. Fig. 13 is a schematic structural diagram of a brake band controlled by a brake mechanism according to an embodiment of the present invention. Referring to fig. 13, the brake mechanism 60 includes a first link 61, a second link 62, and a bidirectional screw 63. The first end of the first connecting piece 61 is sleeved on the first end of the bidirectional screw 63, and the second end of the first connecting piece 61 is hinged with the first end of the brake band 10; the first end of the second connecting member 62 is sleeved on the second end of the bidirectional screw 63, and the second end of the second connecting member 62 is hinged with the second end of the brake band 10. By rotating the bidirectional screw 63, the distance between the first connecting rod 61 and the second connecting rod 62 can be increased or decreased, and further the distance between the first end and the second end of the brake band 10 is increased or decreased, so that the brake band is tightened or loosened.
In one implementation manner of this embodiment, after determining that the braking band is unqualified, the detection method may further include:
and (4) baking the outer side of the brake band by adopting flame to correct the brake band.
In another implementation manner of this embodiment, after determining that the braking band is unqualified, the detection method may further include:
and a pressure reducing jack is adopted to act on the outer side of the brake band to correct the brake band.
Both of the above two implementations can correct an unqualified braking band to make the braking band qualified. That is, after the correction of the brake band that is not qualified, the brake band is detected again by the above method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method of detecting a braking band of a band brake, the method comprising:
providing a platform, wherein the platform is drawn with the outline of an action object of a brake band;
placing the braking band on the platform, wherein the projection of at least one point on the action surface of the braking band on the platform is superposed with the contour of the action object of the braking band, and the projection of other points on the action surface of the braking band on the platform is positioned outside the contour of the action object of the braking band;
dividing the braking band into a plurality of sections, wherein the arc length of each section of the braking band is less than or equal to a set length;
measuring the maximum distance S between the projection of the two ends of each section of the braking belt on the platform and the outline of an action object of the braking belt;
when the maximum value of the maximum distance S corresponding to each section of the braking belt is within a set range, determining that the braking belt is qualified;
and when at least one of the maximum values of the maximum distances S corresponding to the brake bands of all the sections is out of a set range, determining that the brake bands are unqualified.
2. The method of detecting according to claim 1, wherein said dividing said braking band into a plurality of segments comprises:
the brake band is segmented from both ends of the brake band to the middle of the brake band.
3. The method for detecting according to claim 1 or 2, wherein said measuring a maximum distance between a projection of the two ends of each segment of the braking band on the platform and the contour of the acting object of the braking band comprises:
drawing a connecting line between the end part of the brake band and the center of the contour of the action object of the brake band on the platform to obtain an intersection point of the connecting line and the contour of the action object of the brake band;
setting the corner of the ruler with the right angle on the intersection point;
and measuring the maximum gap between the braking belt and the ruler with the right angle by using a ruler with the length measurement, and taking the maximum gap as the maximum distance between the projection of the end part of the braking belt on the platform and the contour of the action object of the braking belt.
4. The detection method according to claim 1 or 2, wherein when one end of a segment of the brake band is an end point of the entire brake band, the detection method further comprises:
selecting at least one measuring line on the action surface of the brake band, wherein connecting lines of all points on the same measuring line and the center of the contour of an action object of the brake band are on the same plane vertical to the horizontal plane;
measuring the maximum distance between the projection of the point on each of the measuring lines on the platform and the contour of the acting object of the braking band.
5. The detection method according to claim 1 or 2, characterized in that when the maximum distance between the projection of the middle of a segment of the braking band on the platform and the contour of the object of action of the braking band is greater than the maximum distance between the projections of the two ends of the braking band on the platform and the contour of the object of action of the braking band, the detection method further comprises:
selecting at least one measuring line on the action surface of the brake band, wherein connecting lines of all points on the same measuring line and the center of the contour of an action object of the brake band are on the same plane vertical to the horizontal plane;
measuring the maximum distance between the projection of the point on each of the measuring lines on the platform and the contour of the acting object of the braking band.
6. The detection method according to claim 1 or 2, wherein when the maximum distance between the projections of the two ends of a segment of the braking band on the platform and the contour of the acting object of the braking band is outside the set range, the detection method further comprises:
selecting at least one measuring line on the action surface of the brake band, wherein connecting lines of all points on the same measuring line and the center of the contour of an action object of the brake band are on the same plane vertical to the horizontal plane;
measuring the maximum distance between the projection of the point on each of the measuring lines on the platform and the contour of the acting object of the braking band.
7. The detection method according to claim 1 or 2, wherein when one end of a segment of the brake band is an end point of the entire brake band, the detection method further comprises:
determining that the braking band is disqualified when at least one of the minimum values of the maximum distances measured by the braking band for each segment is outside the set range.
8. The detection method according to claim 1 or 2, characterized in that the detection method further comprises:
measuring the height of the protrusion or the depth of the depression on the active surface of the braking band;
when the height of the bulge or the depth of the recess on the action surface of the brake band is smaller than or equal to a set threshold value, determining that the brake band is qualified;
and when the height of the bulge or the depth of the depression on the action surface of the brake band is greater than a set threshold value, determining that the brake band is unqualified.
9. The detection method according to claim 1 or 2, wherein after determining that the braking band is not qualified, the detection method further comprises:
and baking the outer side of the brake band by adopting flame, and correcting the brake band.
10. The detection method according to claim 1 or 2, wherein after determining that the braking band is not qualified, the detection method further comprises:
and a pressure reducing jack is adopted to act on the outer side of the brake band to correct the brake band.
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| CN201810791539.1A CN109269437B (en) | 2018-07-18 | 2018-07-18 | Detection method for braking belt of belt brake |
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| CN201810791539.1A CN109269437B (en) | 2018-07-18 | 2018-07-18 | Detection method for braking belt of belt brake |
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| CN109269437A CN109269437A (en) | 2019-01-25 |
| CN109269437B true CN109269437B (en) | 2020-08-07 |
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