CA2936463C - Apparatus and method for measuring the tension of cables supporting a scaffold in a shaft - Google Patents
Apparatus and method for measuring the tension of cables supporting a scaffold in a shaft Download PDFInfo
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- CA2936463C CA2936463C CA2936463A CA2936463A CA2936463C CA 2936463 C CA2936463 C CA 2936463C CA 2936463 A CA2936463 A CA 2936463A CA 2936463 A CA2936463 A CA 2936463A CA 2936463 C CA2936463 C CA 2936463C
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Disclosed is an on-line detection device for the tension of suspension ropes (2) or stabilising ropes (3) in a construction vertical shaft, the device mainly being composed of tension detection devices (4) arranged on masts (6) and a steel wire rope frequency detection portion arranged on the surface of a shaft opening. The tension detection devices mainly comprise inclined surface supports (4-3) fixed on the masts (6) of sheaves (5), pressure sensors (4-2) fixedly mounted on inclined surfaces of the inclined surface supports (4-3) and bearing supports (4-1) fixedly connected to the pressure sensors (4-2). The steel wire rope frequency detection portion mainly comprises frequency detection devices (7) and a signal collector used for collecting frequency signals. The propagation frequency of vibration waves on a steel wire rope is periodically detected via a steel wire rope frequency detection device (7) arranged on a shaft cover platform (8), and the tension of the steel wire rope is obtained via the steel wire rope length I and the rope density p, effectively preventing measurement errors caused by an overturning moment of a bearing base, and thereby correcting the pressure sensor. The on-line detection device is simple in structure, convenient to operate, capable of real-time detection and easy to install, removal of the stabilising ropes is not necessary. measurement is accurate, and signal transmission is convenient. Also disclosed is an on-line detection method for the tension of the suspension ropes (2) or the stabilising ropes (3) in the construction vertical shaft using the on-line detection device.
Description
APPARATUS AND METHOD FOR MEASURING THE TENSION
OF CABLES SUPPORTING A SCAFFOLD IN A SHAFT
FIELD OF THE INVENTION
The present invention relates to an apparatus for measuring the tension on cables in a vertical shaft.
BACKGROUND OF THE INVENTION
At present, the suspension force on a scaffold suspended in a vertical shaft is measured by means of tension measuring devices located at the joint between stabilizing cables and the scaffold. However, during installation, first the stabilizing cables have to be removed, and the tension measuring device has to be treated for dust protection and water-proofing. Since the scaffold will be at a lower position in the shaft as construction proceeds, there will be higher tension on the cables. Consequently, the cables will have a high torque, and will twist violently when they are being removed, possibly causing injuries to workers and twisting of the scaffold because of unbalanced stress. Moreover, the tension measuring device must be installed between the cables and the scaffold in the initial stage of shaft construction, it is difficult to transfer signals from the underground area to the shaft mouth, and it is difficult to effect real-time tension measurement. As well as the tension measuring device approach, a steel cable tension measuring device can be clamped onto the steel cable, and the suspension force of the hanging scaffold measured indirectly by measuring the force acting laterally on the cable, or a measuring device for measuring longitudinal deformation of the steel cable can be clamped onto the cable to measure the suspension force of the hanging scaffold indirectly. However, the indirect measurement approach by measuring the lateral force with a device clamped onto the cable is convenient only for thinner steel cables. For thicker suspension and stabilizing cables, the lateral force is very high and the measurement may be inaccurate because of the short distance and high rigidity.
At the same time, the cable may be damaged because it is bent too much. If a measuring device for measuring the longitudinal deformation of the cable is clamped onto the cable to measure the tension indirectly, a set of wireless node transmission devices must be added in order to improve the measurement of cable tension in the hoisting system. That brings a challenge to tension measuring cost control.
SUMMARY OF THE INVENTION
Technical problem: To overcome the drawbacks in prior art systems, the present invention provides an apparatus and method for measuring suspension and stabilizing cable tension in a vertical shaft. The apparatus is structurally simple, does not require moving the stabilizing cables and is easy to operate.
The method can measure tension accurately in real time.
Technical scheme: The apparatus for measuring tension of a suspension or stabilizing cable in a vertical shaft of the present invention comprises an apparatus for measuring the tension on a suspension or stabilizing cable in a vertical shaft comprising a signal processor (9), a shaft lid (8), a frame (6) mounted on the shaft lid (8), a sheave (5) mounted on the frame (6); a winch (10) mounted on the frame (6) beneath and spaced apart from the sheave (5); a cable with one end fixed to
OF CABLES SUPPORTING A SCAFFOLD IN A SHAFT
FIELD OF THE INVENTION
The present invention relates to an apparatus for measuring the tension on cables in a vertical shaft.
BACKGROUND OF THE INVENTION
At present, the suspension force on a scaffold suspended in a vertical shaft is measured by means of tension measuring devices located at the joint between stabilizing cables and the scaffold. However, during installation, first the stabilizing cables have to be removed, and the tension measuring device has to be treated for dust protection and water-proofing. Since the scaffold will be at a lower position in the shaft as construction proceeds, there will be higher tension on the cables. Consequently, the cables will have a high torque, and will twist violently when they are being removed, possibly causing injuries to workers and twisting of the scaffold because of unbalanced stress. Moreover, the tension measuring device must be installed between the cables and the scaffold in the initial stage of shaft construction, it is difficult to transfer signals from the underground area to the shaft mouth, and it is difficult to effect real-time tension measurement. As well as the tension measuring device approach, a steel cable tension measuring device can be clamped onto the steel cable, and the suspension force of the hanging scaffold measured indirectly by measuring the force acting laterally on the cable, or a measuring device for measuring longitudinal deformation of the steel cable can be clamped onto the cable to measure the suspension force of the hanging scaffold indirectly. However, the indirect measurement approach by measuring the lateral force with a device clamped onto the cable is convenient only for thinner steel cables. For thicker suspension and stabilizing cables, the lateral force is very high and the measurement may be inaccurate because of the short distance and high rigidity.
At the same time, the cable may be damaged because it is bent too much. If a measuring device for measuring the longitudinal deformation of the cable is clamped onto the cable to measure the tension indirectly, a set of wireless node transmission devices must be added in order to improve the measurement of cable tension in the hoisting system. That brings a challenge to tension measuring cost control.
SUMMARY OF THE INVENTION
Technical problem: To overcome the drawbacks in prior art systems, the present invention provides an apparatus and method for measuring suspension and stabilizing cable tension in a vertical shaft. The apparatus is structurally simple, does not require moving the stabilizing cables and is easy to operate.
The method can measure tension accurately in real time.
Technical scheme: The apparatus for measuring tension of a suspension or stabilizing cable in a vertical shaft of the present invention comprises an apparatus for measuring the tension on a suspension or stabilizing cable in a vertical shaft comprising a signal processor (9), a shaft lid (8), a frame (6) mounted on the shaft lid (8), a sheave (5) mounted on the frame (6); a winch (10) mounted on the frame (6) beneath and spaced apart from the sheave (5); a cable with one end fixed to
2 the winch (10) and a second end running over the sheave (5) in an inclined manner and then extending vertically into the shaft and connected to a scaffold (1) in the shaft; a tension measuring device (4) mounted on the frame (6) including a bearing pedestal (4-1), a pressure measuring device (4-2), and a bevelled support (4-
3) fixed to the frame (6), the pressure measuring device (4-2) and the bearing pedestal (4-1) are mounted on the shaft of the sheave (5) and fixed on the bevelled support (4-3); and a frequency measuring device (7) clamping the cable mounted on the shaft lid (8) for transmitting wireless signals to the signal processor (9), which processes the signals and carries out tension calculations.
The angle of inclination of the top surface of the bevelled support is one-half of the angle between the inclined section of the suspension or stabilizing cable running between a winch and a sheave and the vertical section of the cable.
The frequency measuring device comprises two vibration blocks arranged symmetrically on the opposite sides of a suspension or stabilizing cable, an accelerometer fixedly mounted at the outer side of one of the vibration blocks, a wireless transmitter on the accelerometer, a plurality of wheels between the vibration blocks tightly clamping the suspension or stabilizing cable, springs extending between the upper part and lower ends of the vibration blocks, and movable translational wheels on the bottom of the vibration blocks clamped to a tracks on the shaft.
A method of measuring the tension in a suspension or stabilizing cable in a vertical shaft using the above-described apparatus, wherein the tension T on the cable is measured in real time by the pressure measuring device, and the tension T on the cable is measured at regular intervals using the frequency measuring apparatus, and the tension measured by the frequency measuring device is used to correct the pressure measuring device, comprising the following steps:
a) measuring the tension on the cable using the pressure measuring device in real time when the tension on the cable acts on the bearing pedestal via the hoisting sheave. The force acting on the device is transferred to the pressure measuring device that is fixedly connected to the bearing pedestal.
If the angle between the inclined section of the cable and the vertical section of the cable is a, the tension of the cable is T, it is seen from the force composition principle that the pressure acting on the pressure measuring device perpendicular to the surface of the pressure measuring device, the pressure F measured by the pressure measuring device is:
a F =2T = cos ¨) ,2 and thus, the tension T of the suspension cable or stabilizing cable is:
F
T= 2cos(¨a`
2j b) measuring the tension on the cable using the frequency measuring device at regular intervals. Since the translational wheels clamp into the track on the shaft lid, the frequency measuring device can move only horizontally. The
The angle of inclination of the top surface of the bevelled support is one-half of the angle between the inclined section of the suspension or stabilizing cable running between a winch and a sheave and the vertical section of the cable.
The frequency measuring device comprises two vibration blocks arranged symmetrically on the opposite sides of a suspension or stabilizing cable, an accelerometer fixedly mounted at the outer side of one of the vibration blocks, a wireless transmitter on the accelerometer, a plurality of wheels between the vibration blocks tightly clamping the suspension or stabilizing cable, springs extending between the upper part and lower ends of the vibration blocks, and movable translational wheels on the bottom of the vibration blocks clamped to a tracks on the shaft.
A method of measuring the tension in a suspension or stabilizing cable in a vertical shaft using the above-described apparatus, wherein the tension T on the cable is measured in real time by the pressure measuring device, and the tension T on the cable is measured at regular intervals using the frequency measuring apparatus, and the tension measured by the frequency measuring device is used to correct the pressure measuring device, comprising the following steps:
a) measuring the tension on the cable using the pressure measuring device in real time when the tension on the cable acts on the bearing pedestal via the hoisting sheave. The force acting on the device is transferred to the pressure measuring device that is fixedly connected to the bearing pedestal.
If the angle between the inclined section of the cable and the vertical section of the cable is a, the tension of the cable is T, it is seen from the force composition principle that the pressure acting on the pressure measuring device perpendicular to the surface of the pressure measuring device, the pressure F measured by the pressure measuring device is:
a F =2T = cos ¨) ,2 and thus, the tension T of the suspension cable or stabilizing cable is:
F
T= 2cos(¨a`
2j b) measuring the tension on the cable using the frequency measuring device at regular intervals. Since the translational wheels clamp into the track on the shaft lid, the frequency measuring device can move only horizontally. The
4 clamping wheels are rotatably mounted on the vibration blocks, and the clamping springs pull the blocks towards each other pressing the wheels against the cable whereby the steel cable can move only vertically. The accelerometer is mounted outside of one of the vibration blocks and transmits lateral vibration acceleration signals of the cable to the signal processor via the wireless transmitter on the accelerometer. The signal processor processes the signals to obtain the lateral vibration frequency w of the suspension cable or stabilizing cable, and then calculates the tension of T of the steel cable according to the length I of the cable during measurement and the density p of the steel wire cable using the equation:
T = ___________________________________ w + pg1 c) comparing the tension measured by the pressure measuring device with the tension measured by the frequency measuring device, thus determining whether the pressure measuring device is inaccurate and has to be adjusted or replaced if the difference between the two tension values is higher than 20%.
Beneficial effects: with the above-described apparatus and method, the suspension or stabilizing cable tension measuring device can effectively avoid measurement errors incurred by the upsetting moment of the bearing pedestal.
In addition, a frequency measuring device mounted on the shaft lid is used to
T = ___________________________________ w + pg1 c) comparing the tension measured by the pressure measuring device with the tension measured by the frequency measuring device, thus determining whether the pressure measuring device is inaccurate and has to be adjusted or replaced if the difference between the two tension values is higher than 20%.
Beneficial effects: with the above-described apparatus and method, the suspension or stabilizing cable tension measuring device can effectively avoid measurement errors incurred by the upsetting moment of the bearing pedestal.
In addition, a frequency measuring device mounted on the shaft lid is used to
5 measure the tension of the steel cable on a regular basis to correct the tension result of the pressure measuring device. Thus, inaccurate tension measurement results caused by a faulty pressure measuring device operating in real time can be avoided. The apparatus is simple in structure, convenient to operate, capable of performing real time measuring, easy and convenient to install without removing stabilizing cable, accurate in measurements and convenient for signal transmission.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic cross section of a vertical shaft;
Fig. 2 is a schematic front view of a pressure measuring device; and;
Fig. 3 is a schematic front view of a frequency measuring device In the drawings: 1 is a suspended scaffold, 2 is a suspension cable, 3 is a stabilizing cable, 4 is a tension measuring device, 4-1 is a bearing pedestal, 4-2 is a pressure measuring device, 4-3 is a bevelled support, 4-4 is a bolt; 5 is a sheave, 6 is a frame, 7 is a frequency measuring device, 7-1 is a vibration block, 7-2 is an accelerometer, 7-3 is a clamping spring, 7-4 is a clamping wheel, 7-5 is a translational wheel, 8 is a shaft lid, 9 is a signal processor and 10 is a winch.
DETAILED DESCRIPTION OF THE INVENTION
The suspension and stabilizing cable tension measuring device apparatus for use in a vertical shaft including a signal processor 9, a shaft lid 8, a frame 6 mounted on the shaft lid 8, a plurality of spaced apart hoisting sheaves 5 mounted on the frame 6, and a plurality of suspension cables 2 and stabilizing cables 3 with one of their ends fixed to winches 10 and the other ends running over the sheaves
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic cross section of a vertical shaft;
Fig. 2 is a schematic front view of a pressure measuring device; and;
Fig. 3 is a schematic front view of a frequency measuring device In the drawings: 1 is a suspended scaffold, 2 is a suspension cable, 3 is a stabilizing cable, 4 is a tension measuring device, 4-1 is a bearing pedestal, 4-2 is a pressure measuring device, 4-3 is a bevelled support, 4-4 is a bolt; 5 is a sheave, 6 is a frame, 7 is a frequency measuring device, 7-1 is a vibration block, 7-2 is an accelerometer, 7-3 is a clamping spring, 7-4 is a clamping wheel, 7-5 is a translational wheel, 8 is a shaft lid, 9 is a signal processor and 10 is a winch.
DETAILED DESCRIPTION OF THE INVENTION
The suspension and stabilizing cable tension measuring device apparatus for use in a vertical shaft including a signal processor 9, a shaft lid 8, a frame 6 mounted on the shaft lid 8, a plurality of spaced apart hoisting sheaves 5 mounted on the frame 6, and a plurality of suspension cables 2 and stabilizing cables 3 with one of their ends fixed to winches 10 and the other ends running over the sheaves
6 in an inclined manner, i.e., inclined upwardly with respect to the vertical from the winches 10 to the sheaves 5, and then extending over the sheaves and vertically into the shaft. The cables are connected to a suspended scaffold 1 in the shaft. A
tension measuring device 4 is mounted on the frame 6 at each sheave 5. The 5 tension measuring device 4 includes a bearing pedestal 4-1, a pressure measuring device 4-2, and a bevelled support 4-3, wherein the bevelled support 4-3 is connected to the frame 6 by bolts 4-4. The pressure measuring device 4-2 and the bearing pedestal 4-1 located on the rotating shaft of the sheave 5 are fixed on the bevelled support 4-3. The pressure measuring device 4-2 is mounted on the bevelled support 4-3 by bolts 4-4. The bearing pedestal 4-1 is connected to the pressure measuring device 4-2. The angle of inclination of the top surface of the bevelled support 4-3 relative to the horizontal is one-half of the angle between the inclined section of the cable 2 or 3 and the vertical section of the cable 2 or 3. The pressure measuring device 4-2 and the bearing pedestal 4-1 on the shaft of the sheave 5 are fixed on the inclined top surface of the bevelled support 4-3.
Frequency measuring devices 7 that clamp the suspension cables 2 and 3 are mounted on the shaft lid 8. Each frequency measuring device 7 includes a vibration block 7-1 located on each side of the cable 2 or 3, and an accelerometer
tension measuring device 4 is mounted on the frame 6 at each sheave 5. The 5 tension measuring device 4 includes a bearing pedestal 4-1, a pressure measuring device 4-2, and a bevelled support 4-3, wherein the bevelled support 4-3 is connected to the frame 6 by bolts 4-4. The pressure measuring device 4-2 and the bearing pedestal 4-1 located on the rotating shaft of the sheave 5 are fixed on the bevelled support 4-3. The pressure measuring device 4-2 is mounted on the bevelled support 4-3 by bolts 4-4. The bearing pedestal 4-1 is connected to the pressure measuring device 4-2. The angle of inclination of the top surface of the bevelled support 4-3 relative to the horizontal is one-half of the angle between the inclined section of the cable 2 or 3 and the vertical section of the cable 2 or 3. The pressure measuring device 4-2 and the bearing pedestal 4-1 on the shaft of the sheave 5 are fixed on the inclined top surface of the bevelled support 4-3.
Frequency measuring devices 7 that clamp the suspension cables 2 and 3 are mounted on the shaft lid 8. Each frequency measuring device 7 includes a vibration block 7-1 located on each side of the cable 2 or 3, and an accelerometer
7-2 mounted outside of one of the vibration blocks 7-1. The accelerometer is provided with a wireless transmitter. A plurality of wheels 7-4 clamping cable 2 or 3 rotatably mounted on the insides of the vibration blocks 7-1. Clamping springs extend between the upper and lower ends of the vibration blocks 7-1. Movable translational wheels 7-5 clamped into a track on the shaft lid 8 are located on the bottoms of the vibration blocks 7-1. The frequency measuring devices 7 transmit wireless signals to the signal processor 9, which processes the signals and carries out tension calculations.
The tension T on a suspension or stabilizing cable is measured using the above-described apparatus in real time by the pressure measuring device 4-2, and at regular intervals by the frequency measuring device 7. The obtained tension result from the device 7 is used to correct the measurement of the pressure measuring device 4-2 by the following steps:
a) the tension of the suspension cable 2 or 3 is measured by the pressure measuring device 4-2 in real time: when the tension of the suspension cable 2 or 3 acts on the bearing pedestal 4-1 via the sheave 5, the downward force is transferred to the pressure measuring device 4-2. If the angle between the inclined section and the vertical section of the cable 2 or 3 is a, the tension of the cable 2 or 3 is T, it is seen from the force composition principle that the pressure acting on the pressure measuring device 4-2 perpendicular to the surface of the device 4-2 (i.e, the pressure F measured by the pressure measuring device 4-2) is:
F ¨ 2T = cos( a ) and thus, the tension T on the cable 2 or 3 is:
T= _________________________________________ 2cos ic12)
The tension T on a suspension or stabilizing cable is measured using the above-described apparatus in real time by the pressure measuring device 4-2, and at regular intervals by the frequency measuring device 7. The obtained tension result from the device 7 is used to correct the measurement of the pressure measuring device 4-2 by the following steps:
a) the tension of the suspension cable 2 or 3 is measured by the pressure measuring device 4-2 in real time: when the tension of the suspension cable 2 or 3 acts on the bearing pedestal 4-1 via the sheave 5, the downward force is transferred to the pressure measuring device 4-2. If the angle between the inclined section and the vertical section of the cable 2 or 3 is a, the tension of the cable 2 or 3 is T, it is seen from the force composition principle that the pressure acting on the pressure measuring device 4-2 perpendicular to the surface of the device 4-2 (i.e, the pressure F measured by the pressure measuring device 4-2) is:
F ¨ 2T = cos( a ) and thus, the tension T on the cable 2 or 3 is:
T= _________________________________________ 2cos ic12)
8 . .
b) detecting the tension of the cable 2 or 3 using the frequency measuring device 7 at regular intervals. Since the translational wheels 7-5 clamp into the track of the shaft lid 8, the frequency measuring device 7 can move only horizontally. The clamping wheels 7-4 are rotatably mounted on the vibration blocks 7-1. The clamping springs 7-3 clamp the wheels 7-4 against the two sides of the steel cable, whereby the steel cable can move in the vertical direction only. The accelerometer 7-2 is mounted outside of one of the vibration blocks 7-1 and transmits lateral vibration acceleration signals of the cable 2 or 3 to the signal processor 9 via the wireless transmitter on the accelerometer. The signal processor 9 processes the signals to obtain the lateral vibration frequency w of the cable 2 or 3, and then calculates the tension T of the cable according to the length I of the suspension cable 2 or stabilizing cable 3 during measurement and the density p of the cable using the equation:
,42(02 T = Pz2 __________________________________ + pgl c) the tension measured by the pressure measuring device 4-2 is compared with the tension measured by the frequency measuring device 7, thus determining whether the pressure measuring device 4-2 is inaccurate and needs to be adjusted or replaced if the difference between the two tension measurements is higher than 20%.
b) detecting the tension of the cable 2 or 3 using the frequency measuring device 7 at regular intervals. Since the translational wheels 7-5 clamp into the track of the shaft lid 8, the frequency measuring device 7 can move only horizontally. The clamping wheels 7-4 are rotatably mounted on the vibration blocks 7-1. The clamping springs 7-3 clamp the wheels 7-4 against the two sides of the steel cable, whereby the steel cable can move in the vertical direction only. The accelerometer 7-2 is mounted outside of one of the vibration blocks 7-1 and transmits lateral vibration acceleration signals of the cable 2 or 3 to the signal processor 9 via the wireless transmitter on the accelerometer. The signal processor 9 processes the signals to obtain the lateral vibration frequency w of the cable 2 or 3, and then calculates the tension T of the cable according to the length I of the suspension cable 2 or stabilizing cable 3 during measurement and the density p of the cable using the equation:
,42(02 T = Pz2 __________________________________ + pgl c) the tension measured by the pressure measuring device 4-2 is compared with the tension measured by the frequency measuring device 7, thus determining whether the pressure measuring device 4-2 is inaccurate and needs to be adjusted or replaced if the difference between the two tension measurements is higher than 20%.
9 Fig. 1 is a schematic cross section of a vertical shaft. In Fig. 2, a hoisting sheave 5 divides the suspension cable 2 or the stabilizing cable 3 into an inclined section and a vertical section. The bevelled support 4-3 is such that the angle a between the inclined section of the suspension cable 2 or the stabilizing cable 3 and the vertical section must be ascertained in advance, so that the angle of inclination of the top surface of the bevelled support 4-3 is a. The support 4-3 is mounted on the frame 5 using bolts 4-4 and nuts, and then the bearing pedestal 1 of the sheave 5 is mounted on the inclined top surface of the bevelled support 4-3. The angle between the inclined section and the vertical section of the cable 2 or 3 is bisected by a line perpendicular to the top surface of the support. The pressure measured by the pressure measuring device 4-2 is the resultant force of the vertical section and the inclined section, i.e.;
F =2T = cos 1 and the tension T on the cable 2 or 3 is:
T= _______________________________________ 2cos(a ¨2) As shown in Fig. 3, since the translational wheels 7-5 clamp into the track of the shaft lid 8, the frequency measuring device 7 can move only horizontally.
The clamping wheels 7-4 are rotatably mounted on the vibration blocks 7-1, and the clamping springs 7-3 bias the vibration blocks 7-1 toward each other so that the wheels 7-4 permit the steel cable to move in the vertical direction only. The accelerometer 7-2 is mounted outside of one vibration block 7-1 for transmitting the lateral vibration acceleration signals of the cable 2 or 3 to the signal processor 9 via a wireless transmitter. The program in the signal processor 9 receives the signals, processes the signals according to the length I of the cable 2 or 3 and the density p of the cable to determine the tension of the cable using the following equation::
T - P12 6)2 Pg1 Jr The tension measurement is carried out on a regular basis to ensure the accuracy of the tension measured by the pressure measuring device 4.
F =2T = cos 1 and the tension T on the cable 2 or 3 is:
T= _______________________________________ 2cos(a ¨2) As shown in Fig. 3, since the translational wheels 7-5 clamp into the track of the shaft lid 8, the frequency measuring device 7 can move only horizontally.
The clamping wheels 7-4 are rotatably mounted on the vibration blocks 7-1, and the clamping springs 7-3 bias the vibration blocks 7-1 toward each other so that the wheels 7-4 permit the steel cable to move in the vertical direction only. The accelerometer 7-2 is mounted outside of one vibration block 7-1 for transmitting the lateral vibration acceleration signals of the cable 2 or 3 to the signal processor 9 via a wireless transmitter. The program in the signal processor 9 receives the signals, processes the signals according to the length I of the cable 2 or 3 and the density p of the cable to determine the tension of the cable using the following equation::
T - P12 6)2 Pg1 Jr The tension measurement is carried out on a regular basis to ensure the accuracy of the tension measured by the pressure measuring device 4.
Claims (4)
1. An apparatus for measuring the tension on a suspension or stabilizing cable in a vertical shaft comprising a signal processor (9), a shaft lid (8), a frame (6) mounted on the shaft lid (8), a sheave (5) mounted on the frame (6); a winch (10) mounted on the frame (6) beneath and spaced apart from the sheave (5); a cable with one end fixed to the winch (10) and a second end running over the sheave (5) in an inclined manner and then extending vertically into the shaft and connected to a scaffold (1) in the shaft; a tension measuring device (4) mounted on the frame (6) including a bearing pedestal (4-1), a pressure measuring device (4-2), and a bevelled support (4-3) fixed to the frame (6), the pressure measuring device (4-2) and the bearing pedestal (4-1) are mounted on the shaft of the sheave (5) and fixed on the bevelled support (4-3); and a frequency measuring device (7) clamping the cable mounted on the shaft lid (8) for transmitting wireless signals to the signal processor (9), which processes the signals and carries out tension calculations.
2. The tension measuring apparatus of claim 1, wherein the angle of inclination of a top surface of the support (4-3) relative to the horizontal is one-half of the angle between an inclined section of the cable and a vertical section of the cable (2).
3. The tension measuring apparatus of claim 1, wherein the frequency detection device (7) comprises two vibration blocks (7-1) located on opposite sides of the cable (3); an accelerometer (7-2) mounted outside of one of the vibration blocks (7-1) with a wireless transmitter; a plurality of clamping wheels (7-4) rotatable on the inside of the vibration blocks (7-1) clamped against the cable;
clamping springs (7-3) extend between upper and lower ends of the vibration blocks (7-1); and translational wheels (7-5) on the bottoms of the vibration blocks (7-1) connected to and movable on a track on the shaft lid (8).
clamping springs (7-3) extend between upper and lower ends of the vibration blocks (7-1); and translational wheels (7-5) on the bottoms of the vibration blocks (7-1) connected to and movable on a track on the shaft lid (8).
4. A method for measuring the tension on a suspension or stabilizing cable in a vertical shaft using the apparatus of any one of claims 1 to 3, including the steps of measuring the tension T on the cable in real time using the pressure measuring device (4-2); measuring the tension T on the cable at regular intervals using the frequency detection device (7); and comparing the tension measured by the frequency detection device (7) with the tension measured using the pressure measuring device to determine whether the pressure sensing device (4) is inaccurate and needs to be adjusted or replaced if the difference between the two tension measurements is greater than 20%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410623945.9A CN104374508B (en) | 2014-11-07 | 2014-11-07 | A kind of construction vertical suspension rope and steady rope tension on-line measuring device and method |
| CN201410623945.9 | 2014-11-07 | ||
| PCT/CN2015/081598 WO2016070626A1 (en) | 2014-11-07 | 2015-06-17 | On-line detection device and method for tension of suspension ropes or stabilising ropes in construction vertical shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2936463A1 CA2936463A1 (en) | 2016-05-12 |
| CA2936463C true CA2936463C (en) | 2019-07-30 |
Family
ID=52553559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2936463A Expired - Fee Related CA2936463C (en) | 2014-11-07 | 2015-06-17 | Apparatus and method for measuring the tension of cables supporting a scaffold in a shaft |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN104374508B (en) |
| CA (1) | CA2936463C (en) |
| WO (1) | WO2016070626A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104374508B (en) * | 2014-11-07 | 2016-08-31 | 中国矿业大学 | A kind of construction vertical suspension rope and steady rope tension on-line measuring device and method |
| CN106052931B (en) * | 2016-05-18 | 2018-09-14 | 中国矿业大学 | Multi-rope hoisting steel wire rope tension self-balancing test bed and method |
| CN106930521B (en) * | 2017-05-02 | 2018-11-27 | 中国矿业大学 | A kind of ultra-deep construction vertical parallel connection suspension platform location regulating system and method |
| CN107806927B (en) * | 2017-10-16 | 2023-11-07 | 中国电子科技集团公司第十六研究所 | Stirling refrigerator micro-vibration output multi-point suspension system and detection method thereof |
| CN110155904B (en) * | 2018-11-27 | 2020-11-03 | 中国国际海运集装箱(集团)股份有限公司 | Elevator and elevator steel wire rope tension reduction control method |
| US11661312B2 (en) | 2019-01-29 | 2023-05-30 | Otis Elevator Company | Hoisting rope monitoring device |
| CN113602520B (en) * | 2021-07-27 | 2023-03-14 | 中航西安飞机工业集团股份有限公司 | Flexible large-span weak-rigidity light component overturning device and using method |
| CN115183983B (en) * | 2022-09-13 | 2022-11-15 | 中国航空工业集团公司沈阳空气动力研究所 | Control surface hinge moment balance verification loading device |
| CN117129072B (en) * | 2023-10-25 | 2024-02-02 | 创新精密（苏州）有限公司 | Rotating shaft vibration detection device |
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| JPH08136371A (en) * | 1994-11-08 | 1996-05-31 | Sony Corp | Apparatus for measuring tension of running band-shaped body |
| JPH09196783A (en) * | 1996-01-23 | 1997-07-31 | Tsubakimoto Chain Co | Apparatus for measuring tension |
| CN201126388Y (en) * | 2007-11-26 | 2008-10-01 | 中国重型机械研究院 | On-line tension detection device |
| CN101368860B (en) * | 2008-09-12 | 2010-09-01 | 江苏工业学院 | Method for correcting FFT data in stayed-cable force of stayed-cable bridge detected by frequency method |
| CN101726383B (en) * | 2009-12-11 | 2011-03-16 | 太原理工大学 | Multi-rope winder steel wire rope tension test method |
| CN201611292U (en) * | 2010-02-10 | 2010-10-20 | 常州市赛嘉机械有限公司 | Yarn tension measurement apparatus |
| CN102906001B (en) * | 2010-05-27 | 2015-08-26 | 通力股份公司 | Elevator and elevator rope control monitor unit |
| CN103162890A (en) * | 2011-12-19 | 2013-06-19 | 西北机器有限公司 | Twenty-high rolling mill tension measuring device |
| CN103017966A (en) * | 2012-12-10 | 2013-04-03 | 大连博控科技股份有限公司 | Pressure sensing mechanism for detecting tensile force of cable |
| CN103359645B (en) * | 2013-07-08 | 2015-12-09 | 中国矿业大学 | Automatic tension adjusting system and method for guide rope of flexible cable suspension platform |
| CN103776577B (en) * | 2014-01-03 | 2016-05-04 | 中国矿业大学 | Steady rope tension checkout gear and the detection method of construction vertical hanging scaffold |
| CN204314004U (en) * | 2014-11-07 | 2015-05-06 | 中国矿业大学 | A kind of construction vertical suspension rope and steady rope tension on-line measuring device |
| CN104374508B (en) * | 2014-11-07 | 2016-08-31 | 中国矿业大学 | A kind of construction vertical suspension rope and steady rope tension on-line measuring device and method |
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2014
- 2014-11-07 CN CN201410623945.9A patent/CN104374508B/en active Active
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2015
- 2015-06-17 WO PCT/CN2015/081598 patent/WO2016070626A1/en active Application Filing
- 2015-06-17 CA CA2936463A patent/CA2936463C/en not_active Expired - Fee Related
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| CN104374508A (en) | 2015-02-25 |
| CN104374508B (en) | 2016-08-31 |
| CA2936463A1 (en) | 2016-05-12 |
| WO2016070626A1 (en) | 2016-05-12 |
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