CN110752550B - Multi-pulley arrangement method for steering field - Google Patents
Multi-pulley arrangement method for steering field Download PDFInfo
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- CN110752550B CN110752550B CN201911022335.2A CN201911022335A CN110752550B CN 110752550 B CN110752550 B CN 110752550B CN 201911022335 A CN201911022335 A CN 201911022335A CN 110752550 B CN110752550 B CN 110752550B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
- H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
Abstract
The invention discloses a multi-pulley arrangement method for a steering field, which is characterized by comprising the following steps of: the method comprises the following steps: determining the position of a steering field according to the positions of the traction field and the tension field, and measuring a steering angle alpha; step two: determining the number of pulleys in the steering field according to the steering angle alpha; step three: and determining the position relation of the pulleys according to the steering angle alpha and the number of the pulleys. After the steering angle is determined, the number of the pulleys can be rapidly determined and the relative position of each pulley can be further determined, so that only a small number of single pulleys are needed to be carried when a steering field is arranged, the transportation and installation cost is obviously reduced, the standard steering field arrangement can be flexibly carried out according to the actual steering angle, the enveloping angles of the pulleys are equal on the premise of meeting the requirement of special mountainous terrain, the stress of the pulleys is uniform, the running safety of the steering field is improved, and the pulleys and cables are effectively protected.
Description
Technical Field
The invention relates to the technical field of electric power erection engineering, in particular to a multi-pulley arrangement method for a steering field.
Background
In the southwest region, large hydropower stations are mostly built in deep mountains and canyons, and accordingly, more and more power transmission lines are built in high mountains and high mountains.
The tension paying-off is an erection construction method which enables the laid conductor to keep certain tension in the whole process of paying-off and to be separated from the ground and be in an overhead state, the tension paying-off is required to be adopted in power line engineering of more than 110KV according to line acceptance regulations of national grid companies, and the optical cable or the conductor is not allowed to be in contact with the ground in the paying-off process.
With the development and construction of southwest hydropower, more and more transmission lines are provided for 'west and east power transmission', the transmission lines mostly pass through mountainous areas and mountains, in the process of tension stringing, the selection of a traction field and a tension field is difficult, generally, the traction field or the tension field cannot be set when a line center line is paid off, and a steering pulley is needed to be adopted to arrange the steering field to avoid obstacles and reduce the cutting of a large number of trees, so that the construction scheme is more perfect and ideal.
With the gradual maturity of the construction technology of the ultrahigh voltage overhead transmission line in the power grid construction, the development of the construction technology of the overhead transmission line in China enters a new period. Tension paying-off is also performed from initial manual lead paying-off to mechanical construction as the most important process of overhead transmission line construction.
Patent CN104917103A discloses a three coaster unwrapping wire support frames of corner tower tension unwrapping wire, this support frame are isosceles triangle's truss structure, all are provided with a coaster on the three summit of triangle-shaped truss, guarantee that three coaster atress is balanced, stability is good, have reduced the potential safety hazard, have improved the quality and the efficiency of unwrapping wire simultaneously. However, the support frame is limited to be used by three pulleys due to the determination of the truss structure, so that the steering field can only complete steering at 60-90 degrees, the application range is obviously reduced, and the support frame cannot flexibly adapt to complex terrains in mountainous areas. In addition, the design that each tackle is parallel to the horizontal plane in the truss structure enables the running board to be prone to large angle difference when passing through the tackle, the angle difference not only enables the cable to be separated from the tackle, but also enables the tackle to be uneven in stress, the tackle is prone to damage, and potential safety hazards are caused.
Disclosure of Invention
The invention aims to provide a method for arranging multiple pulleys in a steering field, which solves the problem that the number of the pulleys and the relative positions of the pulleys cannot be flexibly, normatively and standardizedly set according to the steering angles of a traction field and a tension field in the prior art, can better adapt to the complex landform in a mountainous area, and is convenient for quickly realizing the arrangement of the steering field.
Another object of the present invention is to provide a multi-block layout method in a steering field, which enables each block to have an initial posture by adjusting an angle between the block and a horizontal plane after determining the number of blocks and a plane position of each block according to a steering angle, so as to reduce an angle difference between the block and a running board, ensure that a cable does not turn over and wear to a large extent when the running board works, and largely prevent the cable from jumping a groove.
The invention is realized by the following technical scheme:
a method of arranging a plurality of sheaves in a steering field, comprising the steps of:
the method comprises the following steps: determining the position of a steering field according to the positions of the traction field and the tension field, and measuring a steering angle alpha;
step two: determining the number of pulleys in the steering field according to the steering angle alpha;
step three: and determining the position relation of the pulleys according to the steering angle alpha and the number of the pulleys.
In the prior art, the three-pulley pay-off support frame disclosed by the invention application CN104917103A standardizes and standardizes the relative distance between three pulleys and the enveloping angle of each pulley, ensures balanced stress and good stability of the three pulleys, reduces potential safety hazards, and simultaneously improves pay-off quality and efficiency. However, the support frame is limited to three pulleys due to the determination of the truss structure, so that the steering field can only complete steering at 60-90 degrees, the application range is obviously reduced, and the support frame cannot flexibly adapt to complex terrains in mountainous areas.
Therefore, when a steering field is arranged in a mountain area, various trusses with different specifications, such as two pulleys, three pulleys and four pulleys, need to be carried, so that the transportation and installation cost is high, and the pulleys are only suitable for being used on a flat ground. In the construction, also according to staff's experience arrange the relative position of a plurality of coasters in the place of turning to, but this kind of setting mode is nonstandard, and is not normal, and the envelope angle of each coaster is inconsistent, leads to the coaster atress uneven and damage easily, has the potential safety hazard, simultaneously, needs debug the coaster position repeatedly after the installation, and the installation effectiveness is low.
Therefore, the invention provides a multi-pulley arrangement method for a steering field, which is suitable for complex terrains in mountainous areas, wherein the relative positions of pulleys in the steering field are reasonably set, so that the enveloping angles of the pulleys do not exceed 30 degrees, the stress of the pulleys is uniform, the pulley installation can be quickly and efficiently completed, and the construction efficiency is obviously improved.
Specifically, the position of the steering field is determined according to the obstacles and areas to be avoided by combining the positions of the traction field and the tension field. After confirmation of the steering field, the steering angle α is measured. The measurement of the steering angle is prior art, for example, a measurement point a is randomly selected in the steering field, a theodolite or a hypothetical theodolite is set at the measurement point a, and the steering angle α of the traction field and the tension field is measured.
And after the steering angle alpha is obtained, determining the number of the pulleys in the steering field according to the size of the steering angle alpha. In order to make the enveloping angle not greater than 30 DEG, the relation between the number n of pulleys and the steering angle alpha satisfies the relation
And the value of n is rounded up. Thus, it is possible to provideWhen the steering angle α is smaller than 30 °, the number of trolleys in the steering field is one, when the steering angle α is larger than 30 ° and smaller than 60 °, the number of trolleys in the steering field is two, and so on.
After the number of the pulleys is determined, the relative position relation of the pulleys can be determined through the steering angle alpha and the number of the pulleys. The relation between the number and the position of the pulleys is as follows: when the number of the pulleys in the steering field is odd, the circle center of the middle steering pulley is positioned on an angular bisector of a supplementary angle of the steering angle, the rest pulleys are divided into a plurality of rows, each row comprises two pulleys, and the two pulleys in the same row are symmetrically arranged about the angular bisector; when the number of the pulleys in the steering field is even, the pulleys are divided into a plurality of rows, each row of pulleys comprises two pulleys, and the two pulleys in the same row are symmetrical about an angular bisector of a supplementary angle of the steering angle. Preferably, the distance between the centers of circles of two adjacent pulleys is equal.
After the positions of the pulleys are determined, the trusses of the pulleys are fixed with the ground, and then the arrangement of the multiple pulleys in the steering field is completed.
Through the setting, after confirming the angle of turning to size, can confirm the quantity of coaster fast and further confirm the relative position of each coaster, make when arranging the place of turning to, only need carry a small amount of single coaster, the transportation installation cost has significantly been reduced, can also carry out the standard according to the nimble ground of the angle of turning to size of reality, the standard place of turning to arranges, under the prerequisite that satisfies the special topography requirement in mountain area, the envelope angle of each coaster equals, the coaster atress is even, the security of the place of turning to operation has been improved, coaster and cable have been protected effectively.
As a preferred embodiment of the invention, the value of the steering angle alpha is between 30 and 120 degrees. When the steering angle is less than 30 degrees, the steering can be completed by using a single pulley; and the construction situation in which the steering angle is more than 120 deg. occurs less frequently in the actual situation. For a steering angle alpha between 30-120 deg.. When alpha is more than or equal to 30 degrees and less than or equal to 60 degrees, the number of the pulleys is two, and the two pulleys are symmetrically arranged about an angular bisector of a supplementary angle gamma of a steering angle alpha; when alpha is more than or equal to 60 degrees and less than or equal to 90 degrees, the number of the pulleys is three, the circle centers of the three pulleys form an isosceles triangle, the angle bisector of the angle gamma is collinear with the symmetry axis of the isosceles triangle, and the pulley positioned in the middle is closer to the measuring point A than the inlet wire pulleys and the outlet wire pulleys on the two sides; when alpha is more than or equal to 90 degrees and less than or equal to 120 degrees, the number of the pulleys is four, the circle centers of the four pulleys form an isosceles trapezoid, the angle bisector of the angle gamma is collinear with the symmetry axis of the isosceles trapezoid, and the two pulleys positioned in the middle are closer to the measuring point A than the inlet wire pulleys and the outlet wire pulleys positioned on the two sides. Preferably, when the number of the pulleys is four, the length of the upper side of the isosceles trapezoid is equal to the length of the waist, that is, the distance between the circle centers of two adjacent pulleys is equal. By means of the arrangement, when the multiple pulleys of the steering field are arranged, a worker can quickly determine the overall position layout of the pulleys, and the arrangement efficiency of the steering field is further improved.
After the overall position relation of the pulleys is determined, the position relation of the pulleys is adjusted according to the number of the different pulleys and the actual steering angle, the pulleys are accurately placed and installed, further rapid and standardized pulley arrangement is achieved, the stress of the pulleys is more uniform, and the safety of operation of a steering field is improved.
Specifically, when the number of the pulleys is two, the third step specifically comprises the following steps:
(S11) symmetrically arranging the first block and the second block with respect to a bisector of the supplementary angle γ;
(S12) adjusting the positions of the first tackle and the second tackle so that the distance d between the center of the first tackle and the center of the second tackle is:
wherein d isABThe distance between the midpoint B of the connecting line of the circle center of the first pulley and the circle center of the second pulley and the measuring point A is shown, and r is the radius of the pulley. dABThe value of (A) is artificially determined according to the actual working condition and the position of the measuring point. By the above relation, the distance d between the circle centers of the two pulleys is along with dABThe size of the cable is increased, and the cable is ensured to be provided by each tackle while the steering angle is maintainedSufficient tension. Preferably, for a two-pulley system, dABIs 1000 mm.
When the number of the pulleys is three, the third step specifically comprises the following steps:
(S21) symmetrically arranging a first pulley and a second pulley about an angle bisector of the compensation angle gamma, wherein the first pulley is an incoming pulley, the second pulley is an outgoing pulley, and a connecting line of circle centers of the first pulley and the second pulley forms the bottom side of an isosceles triangle;
(S22) adjusting the positions of the first block and the second block so that the length d of the base of the isosceles triangle is:
wherein d isABThe distance between the midpoint B of the connecting line of the circle center of the first pulley and the circle center of the second pulley and the measuring point A is shown, and r is the radius of the pulley. dABThe value of (A) is artificially determined according to the actual working condition and the position of the measuring point. By the relation, the distance d between the circle centers of the first pulley and the second pulley is along with dABThe first block and the second block can maintain the steering angle and ensure that the cable has sufficient tension. Preferably, for a three-pulley system, dABIs 1500 mm.
(S23) placing the circle center of the third pulley on the angular bisector of the supplementary angle gamma, wherein the distance S from the circle center of the third pulley to the midpoint B of the connecting line of the circle center of the first pulley and the circle center of the second pulley is as follows:
in the formula, the distance s from the circle center of the third pulley to the middle point B of the connecting line of the circle center of the first pulley and the circle center of the second pulley is also the height of an isosceles triangle formed by the three pulleys.
When the number of the pulleys is four, the third step specifically comprises the following steps:
(S31) symmetrically arranging a first pulley and a second pulley about an angle bisector of the compensation angle gamma, wherein the first pulley is a wire inlet pulley, the second pulley is a wire outlet pulley, and a connecting line of circle centers of the first pulley and the second pulley forms the lower edge of an isosceles trapezoid;
(S32) adjusting the positions of the first block and the second block so that the length d of the lower side of the isosceles trapezoid is:
wherein d isABThe distance between the midpoint B of the connecting line of the circle center of the first pulley and the circle center of the second pulley and the measuring point A is shown, and r is the radius of the pulley. dABThe value of (A) is artificially determined according to the actual working condition and the position of the measuring point. By the relation, the distance d between the circle centers of the first pulley and the second pulley is along with dABThe first block and the second block can maintain the steering angle and ensure that the cable has sufficient tension. Preferably, for a four pulley system, dABIs 2000 mm.
(S33) symmetrically arranging a third pulley and a fourth pulley about an angle bisector of the compensation angle gamma, wherein the circle centers of the third pulley and the fourth pulley are connected to form the upper side of an isosceles trapezoid;
(S34) adjusting the distance between the third block and the fourth block so that the length l of the upper side of the isosceles trapezoid is:
(S35) adjusting the positions of the third block and the fourth block so that the height S of the isosceles trapezoid is:
through the calculation mode, after the steering angle and the number of the pulleys are determined, the position relation of each pulley relative to the measuring point and the distance between the pulleys can be quickly determined, and workers can conveniently arrange and install the pulleys quickly, uniformly and standardly. And the stress of each pulley is more uniform due to the position relation, and the running safety of a steering field is improved.
In actual operation, the walking board entering the turning field is not perpendicular to the horizontal plane, but forms a certain included angle with the horizontal plane. Therefore, if the trolley is arranged parallel to the horizontal plane, an angular difference must exist between the running board and the trolley. When the angle difference is great, not only lead to the cable to break away from in the coaster, the coaster atress is uneven moreover, and the coaster damages easily, causes the potential safety hazard.
In order to solve the problems, the invention provides a preferable arrangement mode of the multi-block of the steering field. After the relative position of each pulley is determined and the corresponding truss is fixed on the ground, the included angle theta between the pulleys and the horizontal plane and the included angle between the hanging rope and the horizontal plane are adjusted according to the pulling force at the hoisting point of the pulleys, the pulling force at the hanging point and the pressure of the cable on the pulleys
Make each coaster possess initial gesture, this initial gesture is close with the entering angle of walking the board, has reduced the angle difference of coaster with walking the board, can guarantee to walk the board at the during operation, and the cable can not take place the upset and the wearing and tearing of big degree, has also avoided the cable to jump the groove simultaneously at to a great extent, further improves the security of turning to the operation of field.
Specifically, when the number of the pulleys is two, the included angle theta between the pulleys and the horizontal plane, and the included angle between the lifting rope and the horizontal plane
The following formula is used to simultaneously obtain:
FH＝2F×cos((180°-β)/2)
wherein, FHFor cable to tackle pressure, FSIs the pulling force at the hoisting point of the pulley, FTThe pulling force at the hanging point of the pulley is beta, the steering angle of a single pulley is beta, F is the traction force of a cable, m is the mass of the pulley, and g is the acceleration of gravity; the tension F at the hanging point of the pulley is read by arranging tension sensors at the hanging point and the hanging pointTAnd the pulling force F at the hoisting point of the pulleySAnd acquiring the cable traction force F through a tractor of the traction field.
When the number of the pulleys is three, the included angle theta between the pulleys and the horizontal plane and the included angle between the lifting rope and the horizontal plane
The following formula is used to simultaneously obtain:
FH＝2F×cos((180°-β)/2)
wherein, FHFor cable to tackle pressure, FSIs the pulling force at the hoisting point of the pulley, FTThe pulling force at the hanging point of the pulley is beta, the steering angle of a single pulley is beta, F is the traction force of a cable, m is the mass of the pulley, and g is the acceleration of gravity; the tension F at the hanging point of the pulley is read by arranging tension sensors at the hanging point and the hanging pointTAnd the pulling force F at the hoisting point of the pulleySAnd acquiring the cable traction force F through a tractor of the traction field.
When the number of the pulleys is four, the included angle theta between the pulleys and the horizontal plane and the included angle between the lifting rope and the horizontal plane
The following formula is used to simultaneously obtain:
FH＝2F×cos((180°-β)/2)
wherein, FHFor cable to tackle pressure, FSIs the pulling force at the hoisting point of the pulley, FTThe pulling force at the hanging point of the pulley is beta, the steering angle of a single pulley is beta, F is the traction force of a cable, m is the mass of the pulley, and g is the acceleration of gravity; the tension F at the hanging point of the pulley is read by arranging tension sensors at the hanging point and the hanging pointTAnd the pulling force F at the hoisting point of the pulleySAnd acquiring the cable traction force F through a tractor of the traction field.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. after the steering angle is determined, the number of the pulleys can be rapidly determined and the relative position of each pulley can be further determined, so that only a small number of single pulleys are needed to be carried when a steering field is arranged, the transportation and installation cost is obviously reduced, the standard steering field can be flexibly arranged according to the actual steering angle, the enveloping angles of the pulleys are equal on the premise of meeting the requirement of special terrain in mountainous areas, the stress of the pulleys is uniform, the running safety of the steering field is improved, and the pulleys and cables are effectively protected;
2. according to the invention, when the number of the pulleys in the steering field is preliminarily determined to be two, three or four according to the size of the steering angle, the whole pulleys in the steering field are in a linear, isosceles triangular or isosceles trapezoid layout, so that a worker can quickly determine the whole position layout of the pulleys when arranging the multiple pulleys in the steering field, and the arrangement efficiency of the steering field is further improved;
3. according to the invention, aiming at a two-pulley, three-pulley and four-pulley system in a steering field, the position relation of each pulley relative to a measuring point and the distance between the pulleys are quickly calculated by using the steering angle and the number of the pulleys, so that workers can quickly, uniformly and standardly arrange and install the pulleys, and the obtained position relation enables the stress of each pulley to be more uniform, and the running safety of the steering field is improved;
4. the invention determines the relative position of each pulley, fixes the corresponding truss on the ground, and adjusts the included angle theta between the pulley and the horizontal plane and the included angle between the hanging rope and the horizontal plane according to the pulling force at the hoisting point of the pulley, the pulling force at the hanging point and the pressure of the cable to the pulley
Make each coaster possess initial gesture, this initial gesture is close with the entering angle of walking the board, has reduced the angle difference of coaster with walking the board, can guarantee to walk the board at the during operation, and the cable can not take place the upset and the wearing and tearing of big degree, has also avoided the cable to jump the groove simultaneously at to a great extent, further improves the security of turning to the operation of field.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a block flow diagram of an embodiment of the present invention;
FIG. 2 is a schematic plan view of two trolleys according to an embodiment of the invention;
FIG. 3 is a schematic plan view of three trolleys according to an embodiment of the invention;
FIG. 4 is a schematic plan view of four trolleys according to an embodiment of the invention;
FIG. 5 is a schematic view of the adjustment of the angle of the trolley in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Example 1:
a method of arranging a multi-block in a steering field as shown in fig. 1, comprising the steps of:
the method comprises the following steps: determining the position of a steering field according to the positions of the traction field and the tension field, and measuring a steering angle alpha;
determining the position of a steering field according to the position of an obstacle and an area to be avoided by combining the positions of the traction field and the tension field; after confirming the steering field, measuring a steering angle alpha;
step two: determining the number of pulleys in the steering field according to the steering angle alpha;
after the steering angle alpha is obtained, the number of the trolleys in the steering field is determined according to the size of the steering angle alpha, and in order to enable the envelope angle not to be larger than 30 degrees, the relation between the number n of the trolleys and the steering angle alpha meets the relational expression
And the value of n is rounded upwards;
step three: determining the position relation of the pulleys according to the steering angle alpha and the number of the pulleys;
the relation between the number and the position of the pulleys is as follows: when the number of the pulleys in the steering field is odd, the circle center of the middle steering pulley is positioned on an angular bisector of a supplementary angle of the steering angle, the rest pulleys are divided into a plurality of rows, each row comprises two pulleys, and the two pulleys in the same row are symmetrically arranged about the angular bisector; when the number of the pulleys in the steering field is even, the pulleys are divided into a plurality of rows, each row of pulleys comprises two pulleys, and the two pulleys in the same row are symmetrical about an angular bisector of a supplementary angle of the steering angle.
After the positions of the pulleys are determined, the trusses of the pulleys are fixed with the ground, and then the arrangement of the multiple pulleys in the steering field is completed.
In some embodiments, the distance between the centers of two adjacent pulleys is equal.
Example 2:
as shown in fig. 2 to 4, on the basis of the embodiment 1, when the angle α is more than or equal to 30 ° and less than or equal to 60 °, the number of the pulleys is two, and the two pulleys are symmetrically arranged about the bisector of the supplementary angle γ of the steering angle α; when alpha is more than or equal to 60 degrees and less than or equal to 90 degrees, the number of the pulleys is three, the circle centers of the three pulleys form an isosceles triangle, and the angle bisector of the angle gamma is collinear with the symmetry axis of the isosceles triangle; when alpha is more than or equal to 90 degrees and less than or equal to 120 degrees, the number of the pulleys is four, the circle centers of the four pulleys form an isosceles trapezoid, and the angle bisector of the angle gamma is collinear with the symmetry axis of the isosceles trapezoid.
By means of the arrangement, when the multiple pulleys of the steering field are arranged, a worker can quickly determine the overall position layout of the pulleys, and the arrangement efficiency of the steering field is further improved.
Example 3:
as shown in fig. 2, when the number of the pulleys is two, the third step specifically includes the following steps:
(S11) symmetrically arranging the first block and the second block with respect to a bisector of the supplementary angle γ;
(S12) adjusting the positions of the first pulley and the second pulley so that the center O of the first pulley is1And the center O of the second pulley2The distance d between is:
wherein d isABIs the center O of the first pulley1And the center O of the second pulley2The distance between the midpoint B of the connecting line and the measuring point A, and r is the radius of the pulley. dABThe value of (A) is artificially determined according to the actual working condition and the position of the measuring point.
Example 4:
as shown in fig. 3, when the number of the pulleys is three, the third step specifically includes the following steps:
(S21) symmetrically arranging a first tackle and a second tackle about an angular bisector of the supplementary angle gamma, wherein the first tackle is an incoming line tackle, the second tackle is an outgoing line tackle, and the circle center O of the first tackle1And the center O of the second pulley2The connecting lines form the bottom edge of an isosceles triangle;
(S22) adjusting the positions of the first block and the second block so that the length d of the base of the isosceles triangle is:
wherein d isABIs the center O of the first pulley1And the center O of the second pulley2The distance between the midpoint B of the connecting line and the measuring point A, and r is the radius of the pulley;
(S23) centering on center O of third pulley3Is placed on the angular bisector of the supplementary angle gamma and the circle center O of the third pulley3To the center O of the first pulley1And the center O of the second pulley2The distance s of the midpoint B of the connecting line is:
in the above formula, the center of the third pulley is O3To the center O of the first pulley1And the center O of the second pulley2The distance s of the middle point B of the connecting line is also the height of an isosceles triangle formed by the three pulleys.
Example 5:
as shown in fig. 4, when the number of the pulleys is four, the third step specifically includes the following steps:
(S31) symmetrically arranging a first tackle and a second tackle about an angular bisector of the supplementary angle gamma, wherein the first tackle is an incoming line tackle, the second tackle is an outgoing line tackle, and the circle center O of the first tackle1And the center O of the second pulley2The connecting line of the lower part of the isosceles trapezoid forms the lower edge of the isosceles trapezoid;
(S32) adjusting the positions of the first block and the second block so that the length d of the lower side of the isosceles trapezoid is:
wherein d isABIs the center O of the first pulley1And the center O of the second pulley2The distance between the midpoint B of the connecting line and the measuring point A, and r is the radius of the pulley.
(S33) symmetrically arranging the third block and the fourth block with respect to the bisector of the supplementary angle γ, wherein the center O of the third block is the center of the circle3And the center O of the fourth pulley4The connection of the two parts forms the upper edge of an isosceles trapezoid;
(S34) adjusting the distance between the third block and the fourth block so that the length l of the upper side of the isosceles trapezoid is:
(S35) adjusting the positions of the third block and the fourth block so that the height S of the isosceles trapezoid is:
example 6:
after a turning field is selected, selecting a proper distance d from a measuring point A to a midpoint B of an incoming line tackle and an outgoing line tackle according to the working condition of the turning fieldABAnd then, calculating by the calculation method in the embodiment 3-5 to obtain various parameters of the layout field, and further obtaining the position relation of various pulleys in the turning field when the two-pulley system, the three-pulley system and the four-pulley system are adopted. Table 1 shows the turns at a plurality of steering anglesThe position relation of each pulley in the radial field, wherein the radius r of each pulley is 660mm, and the calculation result is shown in table 1:
table 1:
the position relation of each tackle relative to the measuring point and the distance between the tackles are quickly calculated by utilizing the size of the steering angle and the number of the tackles, so that the tackles can be quickly, uniformly and standardly arranged and installed by workers, the stress of the tackles is more uniform due to the obtained position relation, and the running safety of a steering field is improved.
Example 7:
as shown in fig. 1 and 5, the method further includes a fourth step, where the fourth step includes: adjusting the included angle theta between the pulley and the horizontal plane and the included angle between the hanging rope and the horizontal plane
When the number of the pulleys is two, the included angle theta between the pulleys and the horizontal plane and the included angle between the lifting rope and the horizontal plane
The following formula is used to simultaneously obtain:
FH＝2F×cos((180°-β)/2)
when the number of the pulleys is three, the included angle theta between the pulleys and the horizontal plane and the included angle between the lifting rope and the horizontal plane
The following formula is used to simultaneously obtain:
FH＝2F×cos((180°-β)/2)
when the number of the pulleys is four, the included angle theta between the pulleys and the horizontal plane and the included angle between the lifting rope and the horizontal plane
The following formula is used to simultaneously obtain:
FH＝2F×cos((180°-β)/2)
wherein, FHFor cable to tackle pressure, FSIs the pulling force at the hoisting point of the pulley, FTThe pulling force at the hanging point of the pulley is beta, the steering angle of a single pulley is beta, F is the traction force of a cable, m is the mass of the pulley, and g is the acceleration of gravity; the tension F at the hanging point of the pulley is read by arranging tension sensors at the hanging point and the hanging pointTAnd the pulling force F at the hoisting point of the pulleySAnd acquiring the cable traction force F through a tractor of the traction field.
Preferably, the included angle theta between each pulley and the horizontal plane and the included angle theta between the lifting rope of each pulley and the horizontal plane in the same system
Are all consistent.
Under the working condition, the included angle psi between the tackle hanging rope and the horizontal plane is equal to the included angle theta between the tackle and the horizontal plane, so that only the included angle theta between the tackle and the horizontal plane and the included angle theta between the lifting rope and the horizontal plane need to be adjusted when the initial state is adjusted
Example 8:
as shown in FIG. 5, the traction force F of the cable is obtained by the traction machine in the traction field to obtain the cable-to-pulley pressure FHAnd then the tension F at the hanging point of the pulley is obtained by a tension sensor arranged at the hanging pointTThe tension F at the hoisting point of the trolley is measured by the tension sensor arranged at the hoisting pointSThen, the initial state of each sheave block in the turning field can be obtained for different turning angles by using the calculation formula in embodiment 7. Table 2 shows the angle theta between each trolley and the horizontal plane in the turning field and the angle theta between the lifting rope of each trolley and the horizontal plane at a plurality of turning angles
The mass m of the pulley is 30kg, and the calculation result is shown in Table 2:
table 2:
calculating to obtain the included angle theta between each pulley and the horizontal plane and the included angle between the lifting rope of each pulley and the horizontal plane
Then, correspondingly adjusting the included angle between the pulley and the horizontal plane and the included angle between the lifting rope and the horizontal plane
Make each coaster possess initial gesture, this initial gesture is close with the entering angle of walking the board, has reduced the angle difference of coaster with walking the board, can guarantee to walk the board at the during operation, and the cable can not take place the upset and the wearing and tearing of big degree, has also avoided the cable to jump the groove simultaneously at to a great extent, further improves the security of turning to the operation of field.
As used herein, "first," "second," "third," "fourth," etc. (e.g., first head block, second head block, third head block, fourth head block, etc.) merely distinguish the respective components for clarity of description and are not intended to limit any order or to emphasize importance, etc. Further, the term "connected" used herein may be either directly connected or indirectly connected via other components without being particularly described.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A method of arranging a plurality of sheaves in a turning field, comprising the steps of:
the method comprises the following steps: determining the position of a steering field according to the positions of the traction field and the tension field, and measuring a steering angle alpha;
step two: determining the number of pulleys in the steering field according to the steering angle alpha;
step three: determining the position relation of the pulleys according to the steering angle alpha and the number of the pulleys;
step four: adjusting the included angle theta between the pulley and the horizontal plane and the included angle between the hanging rope and the horizontal plane
The number of the pulleys is 2 or 3One or 4;
1) when the number of the pulleys is two, the included angle theta between the pulleys and the horizontal plane and the included angle between the lifting rope and the horizontal plane
The following equation is used to obtain:
FH＝2F×cos((180°-β)/2)
wherein, FHFor cable to tackle pressure, FSIs the pulling force at the hoisting point of the pulley, FTThe pulling force at the hanging point of the pulley is beta, the steering angle of a single pulley is beta, F is the traction force of a cable, m is the mass of the pulley, and g is the acceleration of gravity; the tension F at the hanging point of the pulley is read by arranging tension sensors at the hanging point and the hanging pointTAnd the pulling force F at the hoisting point of the pulleySAcquiring a cable traction force F through a tractor of a traction field;
2) when the number of the pulleys is three, the included angle theta between the pulleys and the horizontal plane and the included angle between the lifting rope and the horizontal plane
The following equation is used to obtain:
FH＝2F×cos((180°-β)/2)
wherein, FHFor cable to tackle pressure, FSIs the pulling force at the hoisting point of the pulley, FTThe pulling force at the hanging point of the pulley is beta, the steering angle of a single pulley is beta, F is the traction force of a cable, m is the mass of the pulley, and g is the acceleration of gravity; the tension F at the hanging point of the pulley is read by arranging tension sensors at the hanging point and the hanging pointTAnd the pulling force F at the hoisting point of the pulleySAcquiring a cable traction force F through a tractor of a traction field;
3) when the number of the pulleys is four, the included angle theta between the pulleys and the horizontal plane and the included angle between the lifting rope and the horizontal plane
The following equation is used to obtain:
FH＝2F×cos((180°-β)/2)
wherein, FHFor cable to tackle pressure, FSIs the pulling force at the hoisting point of the pulley, FTThe pulling force at the hanging point of the pulley is beta, the steering angle of a single pulley is beta, F is the traction force of a cable, m is the mass of the pulley, and g is the acceleration of gravity; the tension F at the hanging point of the pulley is read by arranging tension sensors at the hanging point and the hanging pointTAnd the pulling force F at the hoisting point of the pulleySAnd acquiring the cable traction force F through a tractor of the traction field.
2. A steering field multiple block arrangement method according to claim 1, wherein when 30 ° ≦ α ≦ 60 °, the number of blocks is two, the two blocks are symmetrically disposed with respect to an angle bisector of a supplementary angle γ of a steering angle α; when alpha is more than or equal to 60 degrees and less than or equal to 90 degrees, the number of the pulleys is three, the circle centers of the three pulleys form an isosceles triangle, and the angle bisector of the angle gamma is collinear with the symmetry axis of the isosceles triangle; when alpha is more than or equal to 90 degrees and less than or equal to 120 degrees, the number of the pulleys is four, the circle centers of the four pulleys form an isosceles trapezoid, and the angle bisector of the angle gamma is collinear with the symmetry axis of the isosceles trapezoid.
3. The method for arranging multiple pulleys in a steering field according to claim 2, wherein when the number of the pulleys is two, the third step comprises the steps of:
(S11) symmetrically arranging the first block and the second block with respect to a bisector of the supplementary angle γ;
(S12) adjusting the positions of the first tackle and the second tackle so that the distance d between the center of the first tackle and the center of the second tackle is:
wherein d isABD is the distance between the midpoint B of the connecting line of the circle center of the first pulley and the circle center of the second pulley and the measuring point AABThe value of (a) is artificially determined according to the actual working condition and the position of the measuring point, and r is the radius of the pulley.
4. A method of arranging a plurality of sheaves in a steering field according to claim 2, wherein when the number of sheaves is three, said step three comprises the steps of:
(S21) symmetrically arranging a first pulley and a second pulley about an angle bisector of the compensation angle gamma, wherein the first pulley is an incoming pulley, the second pulley is an outgoing pulley, and a connecting line of circle centers of the first pulley and the second pulley forms the bottom side of an isosceles triangle;
(S22) adjusting the positions of the first block and the second block so that the length d of the base of the isosceles triangle is:
wherein d isABD is the distance between the midpoint B of the connecting line of the circle center of the first pulley and the circle center of the second pulley and the measuring point AABThe value of (a) is artificially determined according to the actual working condition and the position of the measuring point, and r is the radius of the pulley;
(S23) placing the circle center of the third pulley on the angular bisector of the supplementary angle gamma, wherein the distance S from the circle center of the third pulley to the midpoint B of the connecting line of the circle center of the first pulley and the circle center of the second pulley is as follows:
5. a method for arranging multiple sheaves in a steering field according to claim 2, wherein when the number of sheaves is four, the third step comprises the steps of:
(S31) symmetrically arranging a first pulley and a second pulley about an angle bisector of the compensation angle gamma, wherein the first pulley is a wire inlet pulley, the second pulley is a wire outlet pulley, and a connecting line of circle centers of the first pulley and the second pulley forms the lower edge of an isosceles trapezoid;
(S32) adjusting the positions of the first block and the second block so that the length d of the lower side of the isosceles trapezoid is:
wherein d isABD is the distance between the midpoint B of the connecting line of the circle center of the first pulley and the circle center of the second pulley and the measuring point AABThe value of (a) is artificially determined according to the actual working condition and the position of the measuring point, and r is the radius of the pulley;
(S33) symmetrically arranging a third pulley and a fourth pulley about an angle bisector of the compensation angle gamma, wherein the circle centers of the third pulley and the fourth pulley are connected to form the upper side of an isosceles trapezoid;
(S34) adjusting the distance between the third block and the fourth block so that the length l of the upper side of the isosceles trapezoid is:
(S35) adjusting the positions of the third block and the fourth block so that the height S of the isosceles trapezoid is:
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