CN103759875B - The device and method of its tension force is calculated by the torsional moment of object - Google Patents
The device and method of its tension force is calculated by the torsional moment of object Download PDFInfo
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Abstract
Torsional moment by object of the present invention calculates the device of its tension force, comprise the quadrilateral frame be made up of entablature, sill, left socle and right support, be characterised in that: entablature, sill all offer the deep-slotted chip breaker matched with rope, rope is provided with the torsion structure be made up of the first clamping plate, the second clamping plate and moment plate, moment plate is provided with strain transducer.Tension force computing method of the present invention comprise: a). stationary rope; B). permanent twist structure; C). rotate torsion structure; D). done work by rope; E). obtain torsional moment; F). calculate the tension force of rope; G). the tension force of rope is judged.Tension force of the present invention calculates apparatus and method, according to the torsional moment of the rope that strain transducer records, accurately, reliably can calculate the size of tension force suffered by rope; When measuring the tension force T of rope is greater than maximum safe tension force and is
time, then send alerting signal, remind staff to take the precautionary measures.
Description
Technical Field
The present invention relates to a device and a method for calculating a tension of an object by using a torsional moment of the object, and more particularly, to a device and a method for calculating a tension of a rope formed by winding fibers by using a torsional moment.
Background
Ropes made of metal wires or chemical fibers are widely used in many fields, such as elevator traction ropes, container suspension ropes, ship traction ropes, etc., and such traction ropes mainly apply tension in their longitudinal directions during operation, which makes them mainly under tension. However, there is no device for effectively and reliably calculating the tension of the rope at present, and when the tension applied by the rope exceeds the maximum range of the bearing tension, effective warning or alarm cannot be given so as to prompt a user to pay attention and take active precautionary measures to avoid dangerous accidents.
For example, in the process of hanging and hoisting goods by using ropes, the phenomenon of 'pressure deviation' often appears, the stress of a certain rope is far greater than that of other ropes, and if the tension state of each rope is not judged in time, the goods are easy to fall off, and safety accidents are caused. For another example, in order to effectively increase the span of a bridge, suspension ropes are used on a plurality of bridges, under the action of different weather conditions such as pedestrians, vehicles and weather, the stress state of each bridge rope is different in different time periods, if the tension state of each rope can not be obtained, the ropes are likely to be in an over-tension state for a long time, and the safety accidents are easily caused.
Disclosure of Invention
The present invention has been made to overcome the above-mentioned problems, and an object of the present invention is to provide a device and a method for calculating the tension of a rope formed by filament winding by using a torsional moment.
The device for calculating the tension of the object through the torsional moment comprises a quadrilateral frame consisting of an upper cross beam, a lower cross beam, a left bracket and a right bracket, wherein the upper cross beam and the lower cross beam are fixed at two ends of the left bracket and the right bracket in parallel; it is characterized in that: arc-shaped grooves matched with the ropes are formed in the upper cross beam and the lower cross beam respectively, an upper fixing plate and a lower fixing plate for fixing the ropes in the arc-shaped grooves are arranged on the upper cross beam and the lower cross beam respectively, and a torsion structure is arranged on the ropes between the upper cross beam and the lower cross beam; the torsion structure consists of a first clamping plate, a second clamping plate and a torque plate, arc-shaped grooves matched with the ropes are formed in the first clamping plate and the second clamping plate, the torque plate is fixed with the first clamping plate and the second clamping plate, and a strain sensor is arranged on the torque plate; the left support and the right support are both provided with positioning grooves matched with the torque plate, and limiting plates for fixing the torque plate are arranged above the positioning grooves.
According to the device for calculating the tension of the object through the torsional moment of the object, the upper fixing plate and the lower fixing plate are respectively fixed with the upper cross beam and the lower cross beam through the fastening bolts, and the first clamping plate and the second clamping plate are fixed together through the fastening bolts; the limiting plate is rotationally fixed on the left support or the right support through the rotating shaft.
The device for calculating the tension of the object through the torsional moment of the object further comprises a circuit part with the functions of acquisition, operation and control, wherein the circuit part comprises a microcontroller, an amplifying circuit, a display circuit and an alarm circuit, the output end of the amplifying circuit is connected with an A/D conversion interface of the microcontroller, the display circuit and the alarm circuit are both connected with the output end of the microcontroller, and the output end of a strain sensor is connected with the input end of the amplifying circuit after passing through a filter circuit.
The invention relates to a method for calculating a tension device of an object through torsional moment of the object, which is characterized in that the distance between an upper cross beam and a lower cross beam is set as 2The torsion structure is arranged at the middle position between the upper cross beam and the lower cross beam, and the rope consists ofA strip of spiral filament; the angle of rotation of the moment plate relative to the initial position isLength of 2In a rope of which the spiral filaments are rotated by an angle of(ii) a The center of the rope between the upper cross beam and the lower cross beam is taken as a coordinate origin o, and the axis of the rope is taken asA z-axis, and establishing a space rectangular coordinate system o-xyz; the tension applied to the rope isWhen it is in use, the corresponding torsional moment isThe maximum safe tension that the rope can bear is set as(ii) a The tension calculation method comprises the following steps: a) the fixing rope is placed in the arc-shaped grooves on the upper cross beam and the lower cross beam and is fixed through the upper fixing plate and the lower fixing plate respectively, so that the rope can move along the length direction of the fixing part of the upper cross beam and the lower cross beam and cannot rotate around the length direction of the fixing part of the upper cross beam and the lower cross beam; b) the fixing and twisting structure is used for placing the first clamping plate and the second clamping plate in the middle of the rope between the upper cross beam and the lower cross beam, enabling the rope to be positioned in the arc-shaped grooves on the first clamping plate and the second clamping plate, and firmly fixing the first clamping plate and the second clamping plate together through fastening bolts so that the rope cannot rotate relative to the first clamping plate and the second clamping plate; c) the rotating and twisting structure rotates along the rotating direction of the rope fibers, the torque plate is placed in the positioning groove on the left support, and the limiting plate rotates to the downward position, so that the limiting effect of the limiting plate on the torque plate is realized; d) the rope is used for drawing the object by doing work, and the rope can be under the action of tension; the moment plate can be deformed when the rope is under tension; e) acquiring the torsion moment, wherein the circuit part acquires the torsion moment by measuring the deformation of the strain sensor, and the torsion moment is set as(ii) a f) Calculating the tension of the rope, calculating the tension of the rope by the formula (1) according to the torsion moment measured in the step e)；
(1)
Wherein,is the first in the ropeThe projection distance of the strip spiral fiber in the xoy plane of the rectangular coordinate system o-xyz from the origin o; g) determining the tension of the rope based on the tension determined in step f)Judgment inequalityWhether the tension is in the safety requirement range is judged, if so, the tension applied to the rope is in the safety requirement range; if the tension is not satisfied, the tension of the rope is beyond the range of safety requirements, and an alarm signal is sent to prompt related personnel.
The invention has the beneficial effects that: the device and the method for calculating the tension of the object through the torsional moment of the object ensure that the rope can be stretched along the length direction of the rope and cannot rotate at the fixed position by fixing the rope on the upper cross beam and the lower cross beam; through set up the torsional structure who comprises first splint, second splint and moment board on the rope, first splint and second splint can realize the firm additional of rope and hold, and are provided with strain sensor on the moment board, and the rope can make strain sensor take place deformation under the effect of tension, consequently according to the torsional moment of the rope that strain sensor surveyed, can accurately, reliably calculate the tensile size that the rope receives.
Through set up constant head tank and limiting plate on left socle and right branch frame, can effectively fix the moment board after the pairing rotation. The invention calculates the tension of an object by the torsional moment of the objectForce measuring device and method, when the measured tension T of the rope is greater than the maximum safe tensionAnd then sending out an alarm signal to remind related workers of paying attention and taking precautionary measures.
Drawings
FIG. 1 is a schematic structural diagram of a device for calculating a tension force of an object by using a torsional moment of the object according to the present invention;
FIG. 2 is a diagram illustrating the state of the tension device of the present invention calculated by the torque of the object;
FIG. 3 is a schematic diagram of a circuit portion of the present invention;
FIG. 4 is a flow chart of a tension calculation method of the present invention.
In the figure: 1 entablature, 2 bottom end rail, 3 left socle, 4 right branch framves, 5 ropes, 6 upper fixed plate, 7 bottom end plate, 8 first splint, 9 second splint, 10 torque plate, 11 strain sensor, 12 fastening bolt, 13 constant head tanks, 14 limiting plates, 15 rotation axes.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, a schematic structural diagram of a tension device for calculating a torsional moment of an object according to the present invention is provided, which includes an upper cross beam 1, a lower cross beam 2, a left bracket 3, a right bracket 4, an upper fixing plate 6, a lower fixing plate 7, a first clamping plate 8, a second clamping plate 9, a moment plate 10, a strain sensor 11, and a fastening bolt 12; the left support 3 and the right support 4 are arranged in parallel, and the upper cross beam 1 and the lower cross beam 2 are respectively fixed at the upper end and the lower end of the left support 3 and the right support 4. Arc-shaped grooves matched with the ropes 5 are formed in the upper cross beam 1 and the lower cross beam 2, and the ropes on the upper cross beam 1 and the lower cross beam 2 are fixed by the upper fixing plate 6 and the lower fixing plate 7 respectively. Arc-shaped grooves matched with the rope 5 are formed in the first clamping plate 8 and the second clamping plate 9, the rope 5 is tightly clamped by the first clamping plate 8 and the second clamping plate 9 through fastening bolts 12, the moment plate 10 is fixed with the first clamping plate 8 and the second clamping plate 9, and the strain sensor 11 is fixed on the moment plate 10; the deformation amount of the moment plate 10 can be measured by the strain sensor 11, and the torsion moment of the moment plate 10 can be obtained.
Constant head tank 13 has all been seted up on shown left socle 3 and the right branch frame 4, and constant head tank 13 is used for cooperateing with the moment board 10 after the rotation, all is provided with limiting plate 14 on the left socle 3 of constant head tank 13 top and the right branch frame 4, and limiting plate 14 carries out the rotation and fixes through rotation axis 15, and limiting plate 14 carries on spacingly to the moment board 10 that enters into in constant head tank 13. As shown in fig. 3, a schematic diagram of a circuit part of the present invention is provided, which includes a microcontroller 18, a filter circuit 16, an amplifier circuit 17, a display circuit 19 and an alarm circuit 20, wherein a signal output by the strain sensor 11 is processed by the filter circuit 16 and then input into the amplifier circuit 17, and the amplifier circuit 17 amplifies the signal and then inputs into the microcontroller 18. The microcontroller 18 carries on A/D conversion to the signal that the amplifying circuit 17 outputs, through the relevant calculation, find the tension magnitude of the rope 5, display the relevant information through the display circuit 19; when the tension of the rope is overlarge, an alarm signal is sent out through an alarm circuit.
In the using process of the device, the rope 5 is firstly placed in the arc-shaped grooves on the upper cross beam 1 and the lower cross beam 2, the upper fixing plate 6 is fixed on the upper cross beam 1 through the fastening bolt 12, and then the rope 5 is tightly pressed in the arc-shaped grooves on the upper cross beam 1, so that the rope 5 at the upper cross beam 1 can be stretched up and down and can not rotate around the axis of the rope 5. Similarly, the lower fixing plate 7 is fixed to the lower cross member 2 by means of a fastening bolt 12 so as to press the rope 5 tightly in the arc-shaped groove of the lower cross member 2, and also so that the rope 5 at the lower cross member 2 can be stretched in its length direction without rotational movement. Then, the first clamping plate 8 and the second clamping plate 9 are placed on both sides of the middle position of the rope 5 between the upper beam 1 and the lower beam 2, and the first clamping plate 8 and the second clamping plate 9 are firmly fixed together by the fastening bolt 12, so that the rope 5 cannot relatively rotate with respect to the first clamping plate 8 and the second clamping plate 9. Finally, the moment plate 10 is placed in the positioning groove 13 on the left bracket 3 by rotating the moment plate 10, and the limiting plate 14 is rotated to limit the moment plate 10, so that the rope 5 between the upper cross beam 1 and the lower cross beam 2 is rotated while being tensioned, and the moment plate 10 has a tendency to return to the initial position. Further, the greater the tensile tension to which the rope 5 is subjected, the greater the tendency of the moment plate 10 to return to the initial position. The strain sensor 11 disposed on the moment plate 10 can measure the magnitude of the moment on the moment plate 10. Therefore, if the relationship between the tension applied to the rope 5 and the torsional moment on the moment plate 10 can be accurately expressed, the tension of the rope 5 can be effectively calculated under the condition that the torsional moment is measured, so as to evaluate the stress of the rope 5.
As shown in FIG. 4, a flow chart of the tension calculation method of the present invention is shown, and the distance between the upper beam 1 and the lower beam 2 is set to 2The torsion structure is arranged at the middle position between the upper beam 1 and the lower beam 2, and the rope 5 is composed ofA strip of spiral filament; the rotation angle of the moment plate 10 with respect to the initial position isLength of 2In a rope of which the spiral filaments are rotated by an angle of(ii) a Establishing a space rectangular coordinate system o-xyz by taking the center of the rope between the upper cross beam and the lower cross beam as a coordinate origin o and the axis of the rope as a z-axis; is arranged on a rope receiverTo a tension ofWhen it is in use, the corresponding torsional moment isThe maximum safe tension that the rope can bear is set as(ii) a The invention relates to a method for calculating a tension device by the torsional moment of an object, which is realized by the following steps:
a) fixing ropes, namely placing the ropes 5 in arc-shaped grooves on the upper cross beam 1 and the lower cross beam 2, and fixing the ropes through an upper fixing plate 6 and a lower fixing plate 7 respectively, so that the ropes can move along the length direction of the fixing positions of the upper cross beam and the lower cross beam and cannot rotate around the length direction of the fixing positions of the upper cross beam and the lower cross beam;
b) a fixed torsion structure, wherein a first clamping plate 8 and a second clamping plate 9 are placed in the middle of a rope between an upper cross beam and a lower cross beam, the rope is positioned in arc-shaped grooves on the first clamping plate and the second clamping plate, and the first clamping plate and the second clamping plate are firmly fixed together through a fastening bolt 12, so that the rope cannot rotate relative to the first clamping plate and the second clamping plate;
c) a rotary torsion structure, which rotates in the rotation direction of the rope fiber, places the torque plate in the positioning groove 13 on the left bracket 3, and rotates the limiting plate 14 to the downward position, so as to realize the limiting effect on the torque plate by using the limiting plate 14;
d) the rope is used for drawing the object by doing work, and the rope can be under the action of tension; the moment plate can be deformed when the rope is under tension;
e) the circuit part measures the deformation of the strain sensor 11 to obtain the torque, and the torque is set as；
f) Calculating the tension of the rope, calculating the tension of the rope by the formula (1) according to the torsion moment measured in the step e)；
(1)
Wherein,is the first in the ropeThe projection distance of the strip spiral fiber in the xoy plane of the rectangular coordinate system o-xyz from the origin o;
the derivation of equation (1) is as follows:
in orthogonal co-ordinate systems o-xyz, of ropes in the direction of the z-axisRotation angle for sliver-spiral filamentLabeling is performed as shown in equation (2):
，，， （2）
wherein, the vector、、Is a unit vector in the directions of the x-axis, the y-axis and the z-axis,the pitch of the spiral fiber filaments;
first, theThe length of the sliver helical filament can be determined by equation (3):
（3）
since H =Substituting equation (3) yields:
（4）
the rotation angle of the rope between the upper beam 1 and the lower beam 2 is setAfter that, the length of the spiral filament becomesThen, thenThe expression of (a) is:
（5）
elongation of spiral filamentComprises the following steps:
（6）
the length of the bottom edge is set toHigh isThe length of the diagonal isThe included angle between the bottom edge and the hypotenuse of the right triangle isThus, it can be seen that:
（7）
amount of elongationCan be approximately expressed as:
（8）
the cross-sectional area of the spiral fiber is set asHas a Young's modulus ofThe elongation of the spiral filament can be determinedAfter deformation, the required tensionComprises the following steps:
（9）
can obtain the unit tangent vector of the spiral fiberComprises the following steps:
（10）
due to the fact thatIs obtained by
（11）
The joint formulae (9), (10) and (11) can give:
（12）
the resultant force of all the helical filaments being the tension to which the rope is subjected；
（13）
Tension acting on the helical filamentsGenerated torqueComprises the following steps:
（14）
substituting equations (2), (9), (10) and (11) into equation (14) can obtain:
（15）
the torsional moments of all helical filaments are:
（16）
elimination of rotation angle by equations (13) and (16)Equation (1) can be derived.
g) Determining the tension of the rope based on the tension determined in step f)Judgment inequalityWhether the tension is in the safety requirement range is judged, if so, the tension applied to the rope is in the safety requirement range; if the tension is not satisfied, the tension of the rope is beyond the range of safety requirements, and an alarm signal is sent to prompt related personnel.
Claims (3)
1. A device for calculating the tension of an object through the torsional moment of the object comprises a quadrilateral frame consisting of an upper beam (1), a lower beam (2), a left bracket (3) and a right bracket (4), wherein the upper beam and the lower beam are fixed at two ends of the left bracket and the right bracket in parallel; the method is characterized in that: arc-shaped grooves matched with the ropes (5) are formed in the upper cross beam and the lower cross beam respectively, an upper fixing plate (6) and a lower fixing plate (7) for fixing the ropes in the arc-shaped grooves are arranged on the upper cross beam and the lower cross beam respectively, and a torsion structure is arranged on the ropes between the upper cross beam and the lower cross beam; the torsion structure consists of a first clamping plate (8), a second clamping plate (9) and a torque plate (10), arc-shaped grooves matched with the ropes are formed in the first clamping plate and the second clamping plate, the torque plate, the first clamping plate and the second clamping plate are fixed, and a strain sensor (11) is arranged on the torque plate; positioning grooves (13) matched with the moment plates are formed in the left support and the right support, and limiting plates (14) for fixing the moment plates are arranged above the positioning grooves;
the strain sensor is characterized by further comprising a circuit part with the functions of acquisition, operation and control, wherein the circuit part comprises a microcontroller (18), an amplifying circuit (17), a display circuit (19) and an alarm circuit (30), the output end of the amplifying circuit is connected with an A/D conversion interface of the microcontroller, the display circuit and the alarm circuit are both connected with the output end of the microcontroller, and the output end of the strain sensor is connected with the input end of the amplifying circuit after passing through a filter circuit.
2. The apparatus for calculating the tension of an object by its torsional moment according to claim 1, wherein: the upper fixing plate (6) and the lower fixing plate (7) are respectively fixed with the upper cross beam (1) and the lower cross beam (2) through fastening bolts (12), and the first clamping plate (8) and the second clamping plate (9) are fixed together through the fastening bolts; the limiting plate (14) is rotationally fixed on the left support (3) or the right support (4) through a rotating shaft (15).
3. A method for calculating a tension device by torsional moment of an object according to claim 1, wherein the distance between the upper beam (1) and the lower beam (2) is set to be 2H, the torsional structure is positioned at the middle position between the upper beam (1) and the lower beam (2), and the rope (5) is composed of N spiral fiber yarns; the rotation angle of the moment plate (10) relative to the initial position isThe rotation angle of the spiral fiber filaments in the rope with the length of 2H is 4k pi; establishing a space rectangular coordinate system o-xyz by taking the center of the rope between the upper cross beam and the lower cross beam as a coordinate origin o and the axis of the rope as a z-axis; when the rope is subjected to a tension of T, the corresponding tension isThe torsion moment is R, and the maximum safe tension born by the rope is Tmax(ii) a The tension calculation method comprises the following steps:
a) fixing the rope, namely placing the rope (5) in arc-shaped grooves on the upper cross beam (1) and the lower cross beam (2), and fixing the rope through an upper fixing plate (6) and a lower fixing plate (7) respectively, so that the rope can move along the length direction of the fixing part of the upper cross beam and the lower cross beam and cannot rotate around the length direction of the fixing part;
b) a fixed torsion structure, wherein a first clamping plate (8) and a second clamping plate (9) are placed in the middle of a rope between the upper cross beam and the lower cross beam, the rope is positioned in arc-shaped grooves in the first clamping plate and the second clamping plate, and the first clamping plate and the second clamping plate are firmly fixed together through a fastening bolt (12) so that the rope cannot rotate relative to the first clamping plate and the second clamping plate;
c) the rotating and twisting structure rotates along the rotating direction of the rope fibers, the torque plate is placed in a positioning groove (13) on the left support (3), and the limiting plate (14) rotates to a downward position, so that the limiting effect on the torque plate is realized by the limiting plate (14);
d) the rope is used for drawing the object by doing work, and the rope can be under the action of tension; the moment plate can be deformed when the rope is under tension;
e) acquiring a torsional moment, wherein the circuit part acquires the torsional moment at the moment by measuring the deformation quantity of the strain sensor (11), and the torsional moment is set as R;
f) calculating the tension of the rope, and calculating the tension T suffered by the rope through a formula (1) according to the torsion moment measured in the step e);
wherein r isiThe distance from the projection distance to the origin o of the ith spiral fiber in the rope in the xoy plane of a rectangular coordinate system o-xyz;
g) determining the tension of the rope, and determining the inequality T not more than T according to the tension T obtained in the step f)maxWhether the tension is in the safety requirement range is judged, if so, the tension applied to the rope is in the safety requirement range; if the tension is not satisfied, the tension of the rope is beyond the range of safety requirements, and an alarm signal is sent to prompt related personnel.
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| CN201410029085.6A CN103759875B (en) | 2014-01-22 | 2014-01-22 | The device and method of its tension force is calculated by the torsional moment of object |
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| CN108763780B (en) * | 2018-05-31 | 2023-02-28 | 南京信息工程大学 | Rope tension measuring method based on Kriging difference algorithm |
| CN110411639B (en) * | 2019-08-30 | 2024-04-09 | 浙江致信智控装备有限公司 | Tension sensor for yarn |
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| DE3713290A1 (en) * | 1987-04-18 | 1988-11-03 | Barmag Barmer Maschf | Yarn tensile strength measuring device having a resiliently movable yarn detector |
| CN100437064C (en) * | 2005-09-30 | 2008-11-26 | 沈阳新光华晨汽车发动机有限公司 | Calibrator for measuring on-line belt tension |
| KR100827713B1 (en) * | 2007-01-12 | 2008-05-07 | (주)에이펙스 솔루션 | Method for calculating tension applied to cable tension sensor and deriving method thereof |
| CN101319945A (en) * | 2008-06-30 | 2008-12-10 | 上海都峰智能科技有限公司 | Three-bar single support type tension measurement method |
| CN101922986B (en) * | 2010-07-20 | 2013-01-16 | 河南恒星钢缆有限公司 | Combined clamp of device for monitoring tension of steel strand |
| CN103359565B (en) * | 2012-04-06 | 2016-04-06 | 富士达株式会社 | The cable strain measuring method of elevator and device |
| CN203396530U (en) * | 2013-08-07 | 2014-01-15 | 浙江富邦集团有限公司 | Leather tension detection device with improved structure |
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