CN112033602A - High-strength bolt ultrasonic axial force coefficient field calibration system - Google Patents
High-strength bolt ultrasonic axial force coefficient field calibration system Download PDFInfo
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- CN112033602A CN112033602A CN202011013575.9A CN202011013575A CN112033602A CN 112033602 A CN112033602 A CN 112033602A CN 202011013575 A CN202011013575 A CN 202011013575A CN 112033602 A CN112033602 A CN 112033602A
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- axial force
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- strength bolt
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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Abstract
The invention discloses a high-strength bolt ultrasonic axial force coefficient field calibration system, which mainly comprises: load temperature control device, portable hydraulic pump, portable host computer, its characterized in that: the loading temperature control device comprises a hollow hydraulic cylinder, a heater, an annular strain gauge, a wire passing gasket and an ultrasonic transducer, the portable hydraulic pump is connected with the hollow hydraulic cylinder, and the portable host is connected with the annular strain gauge, the heater and the ultrasonic transducer. The invention adopts a portable hydraulic pump loading mode and an electric heating film heating mode, and can realize the field calibration of the ultrasonic axial force coefficient and the temperature coefficient of the high-strength bolt.
Description
Technical Field
The invention relates to the field of ultrasonic measurement of axial force of bolts, in particular to a high-strength bolt ultrasonic axial force coefficient field calibration system.
Background
The bolt ultrasonic axial force measuring technology obtains the real elongation of the bolt by measuring the flight time of ultrasonic waves in the bolt, and then converts the real axial force of the bolt, and has the advantages of high precision and good reliability. At present, the technology is gradually popularized and applied in the fields of automobiles, bridges, wind power and the like in China. However, the mapping relationship between the time of flight of the ultrasonic wave within the bolt and the true axial force is affected by the bolt itself. Generally, before the axial force measurement is carried out, the axial force coefficient and the temperature coefficient of bolts of the same type and the same batch need to be calibrated. High strength bolts, typically used in large structures, need to withstand stresses of tens of tons. The calibration of the high-strength bolt is generally carried out in a laboratory through a drawing press machine and a high-low temperature test box, the process is complex, the equipment is huge, and the calibration cannot be carried out on the construction site.
An existing portable ultrasonic detection coefficient calibration device for bolt fastening force, such as CN110967143A, a chinese patent of invention, provides a portable ultrasonic detection coefficient calibration device for bolt fastening force, which includes a bolt fastening force generation device and an ultrasonic signal detection system. The bolt fastening force generating device consists of a bolt pre-tightening and loading module and a stopping module and is used for realizing the pre-tightening and loading process of a bolt to be calibrated; the ultrasonic signal detection system consists of an industrial control computer, a pulse transceiving and data acquisition card, a coaxial radio frequency switch and a time-sharing transverse-longitudinal wave integrated probe, and is used for exciting and receiving ultrasonic pulse echoes inside a bolt to be calibrated so as to realize calibration of the ultrasonic detection coefficient of the bolt fastening force.
The device has the following defects: the adopted fastening force generating device is of a box type electric control screw loading structure, and is difficult to meet the large-tonnage loading requirement of high-strength bolts of large-scale structures such as a wind generating set and the like; the calibrated parameter is only the axial force coefficient, and the temperature coefficient cannot be calibrated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and designs a high-strength bolt ultrasonic axial force coefficient field calibration system which is used for solving the problem of field calibration of the high-strength bolt ultrasonic axial force coefficient of large-scale equipment such as a wind power generation set. The device adopts portable hydraulic pump axial force loading mode and electric heat membrane heating mode, compact structure, light in weight can carry to the job site and carry out supersound axial force coefficient and temperature coefficient to the bolt and mark.
The technical scheme adopted by the invention is as follows:
the system mainly comprises a loading temperature control device, a portable hydraulic pump and a portable host.
The loading temperature control device comprises a hollow hydraulic cylinder, a heater, an annular strain gauge, a wire passing gasket and an ultrasonic transducer. Furthermore, the hollow hydraulic cylinder is connected with the portable hydraulic pump, so that hydraulic stretching force is applied to the bolt penetrating through the hollow hydraulic cylinder; the heater comprises an electric heating film and a thermocouple resistor, the electric heating film is coated on the screw to heat the screw, and the thermocouple resistor is attached to the inner side of the heating film to measure the temperature of the bolt; the annular strain gauge is sleeved on the screw and arranged between the screw head and the hollow hydraulic cylinder, so that the high-precision measurement of the axial force is realized; the wire passing gasket is sleeved on the screw rod, the end face of the wire passing gasket is provided with a wire passing groove, and the wire passing groove is arranged between the nut and the hollow hydraulic cylinder so as to realize that the heater power supply measuring line penetrates out of the wire passing groove; the ultrasonic transducer is adhered to the end face of the screw through a coupling agent to realize ultrasonic transmission and reception.
The portable hydraulic pump is connected with the hollow hydraulic cylinder to provide high-pressure hydraulic pressure for the loading temperature control device.
The portable host comprises a temperature measurement control module, an axial force measurement control module, an ultrasonic excitation measurement module and a calculation display module. Furthermore, the temperature measurement control module is connected with the heater to realize temperature measurement and temperature regulation of the heater; the axial force measurement control module is connected with the annular strain gauge to realize high-precision measurement of axial strain and conversion calculation of axial force; the ultrasonic measurement module is connected with the ultrasonic transducer to realize the calculation and measurement of the flight time of the ultrasonic wave; the calculation display module realizes the display and fitting calculation of parameters such as flight time, axial force, temperature and the like, and displays and stores the ultrasonic axial force coefficient and the temperature coefficient.
The invention has the beneficial effects that:
(1) the system is integrated, simple in structure, portable and suitable for field calibration.
(2) And a portable hydraulic loading device is adopted to realize the on-site ultrasonic axial force coefficient calibration of the high-strength bolt.
(3) The temperature control of the bolt on site is realized by adopting electric heating film heating and thermocouple resistance temperature measurement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a system configuration of an ultrasonic axial force coefficient on-site calibration system for a high-strength bolt according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a loading temperature control device of an ultrasonic axial force coefficient on-site calibration system for a high-strength bolt according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a disassembled structure of a loading temperature control device of an ultrasonic axial force coefficient on-site calibration system for a high-strength bolt according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a heater of an ultrasonic axial force coefficient field calibration system for a high-strength bolt according to an embodiment of the invention.
FIG. 5 is a schematic diagram of a line-passing gasket of an ultrasonic axial force coefficient field calibration system for a high-strength bolt according to an embodiment of the invention.
FIG. 6 is a functional block diagram of a portable host of an ultrasonic axial force coefficient field calibration system for a high-strength bolt according to an embodiment of the present invention.
The reference numbers:
1-ultrasonic transducer, 2-nut, 3-heater, 4-hollow hydraulic cylinder, 5-annular strain gauge, 6-screw, 7-wire-passing gasket, 8-heating film, 9-thermocouple resistor, 10-wire-passing groove, 11-ultrasonic excitation measuring module, 12-temperature measuring control module, 13-axial force measuring control module, 14-calculation display module, 110-loading temperature control device, 120-portable hydraulic pump, 130-portable host computer
Detailed Description
To make the objects, solutions and advantages of the present invention clearer, embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout.
The following describes an ultrasonic axial force coefficient field calibration system for a high-strength bolt according to an embodiment of the invention with reference to the accompanying drawings.
As shown in fig. 1, an ultrasonic axial force coefficient on-site calibration system for a high-strength bolt according to an embodiment of the present invention includes three major parts, namely, a loading temperature control device 110, a portable hydraulic pump 120, and a portable host 130.
Referring to fig. 1, portable hydraulic pump 120 is a manual portable hydraulic pump, and is connected to load thermostat 110 to provide high-pressure hydraulic pressure to load thermostat 110.
In some embodiments, the portable hydraulic pump may be a portable electrically-powered hydraulic pump.
Referring to fig. 2, 3, 4, and 5, the loading temperature control device includes: the ultrasonic transducer comprises an ultrasonic transducer 1, a heater 3, a hollow hydraulic cylinder 4, an annular strain gauge 5 and a wire passing gasket 7. The ultrasonic transducer 1 is connected with the end face of the screw 6 through a coupling agent, so that the transmission and the reception of ultrasonic waves are realized; the heater 3 comprises an electric heating film 8 and a thermistor 9, and is coated on the screw 6 to realize heating and temperature measurement of the screw 6; the hollow hydraulic cylinder 4 is sleeved on the screw 6 and is arranged between the screw 6 and the nut 2, so that the axial stretching loading of the screw 6 is realized; the annular strain gauge 5 is sleeved on the screw 6 and is arranged between the hollow hydraulic cylinder 4 and the big end of the screw 6, so that the axial force measurement of the screw 6 is realized; the wire passing gasket 7 is sleeved on the screw rod and is arranged between the hollow hydraulic cylinder 4 and the nut 2, so that the power supply and measurement lines of the heater 3 penetrate out of the wire passing groove 10.
As shown in fig. 6, portable host 130 includes: the ultrasonic testing device comprises an ultrasonic excitation measuring module 11, a temperature measuring control module 12, an axial force measuring control module 13 and a calculating and displaying module 14. The ultrasonic excitation measurement module 11 is connected with an ultrasonic transducer to measure the flight time of ultrasonic waves; the temperature measurement control module 12 is connected with the heater 3 to realize temperature measurement and temperature regulation of the heater 3; the axial force measurement control module 13 is connected with the annular strain gauge 5 to realize high-precision measurement of axial strain and conversion calculation of axial force; and the calculation display module 14 is used for displaying parameters such as flight time, axial force, temperature and the like, and fitting and calculating an axial force coefficient and a temperature coefficient and displaying the axial force coefficient and the temperature coefficient.
As an example, the working principle of the present embodiment is as follows:
firstly, all modules are connected: as shown in fig. 1 and 6, the portable hydraulic pump 120 is connected to the hollow hydraulic cylinder 4 of the load temperature control device 110 through a pipeline. The heater 3 is wrapped around the screw 6. According to the figure 6, the annular strain gauge 5, the wire passing gasket 7 and the hollow hydraulic cylinder 4 are sleeved in the screw rod 6 in sequence, the connecting wire of the heater 3 penetrates out of the wire passing gasket 7, and then the nut 2 is screwed down. And smearing coupling agent on the end face of the screw, and pressing the ultrasonic transducer 1 on the coupling agent. The ultrasonic transducer 1 is connected with an ultrasonic excitation measuring module 11, a connecting wire of the heater 3 passes through a wire passing groove 7 to be connected with a temperature measuring control module 12, and the annular strain gauge 5 is connected with an axial force measuring control module 13.
When the axial force coefficient is calibrated, the portable hydraulic pump 120 is pressurized, the hollow hydraulic cylinder 4 extends out, the screw 6 is stretched, and the portable host 130 acquires data through the ultrasonic transducer 1, the annular strain gasket 5 and the heater 3, and converts the data to obtain the ultrasonic flight time, the axial force and the temperature. The portable host stores the acquired data in the memory, and calculates and displays the axial force fitting result and stores the axial force fitting result in the hard disk after the measurement is finished.
When the temperature coefficient is calibrated, the portable hydraulic pump 6 pressurizes to a fixed pressure, and the portable host 130 controls the heater 3 to heat up. The portable host computer acquires data through the ultrasonic transducer 1, the annular strain gasket 5 and the heater 3, and converts the data to obtain the ultrasonic flight time, the axial force and the temperature. The portable host stores the acquired data in the memory, and calculates and displays the temperature fitting result and stores the temperature fitting result in the hard disk after the measurement is finished.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (5)
1. The utility model provides a high strength bolt supersound axle force coefficient field calibration system, mainly includes: load temperature control device, portable hydraulic pump, portable host computer, its characterized in that: the loading temperature control device comprises a hollow hydraulic cylinder, a heater, an annular strain gauge, a wire passing gasket and an ultrasonic transducer, the portable hydraulic pump is connected with the hollow hydraulic cylinder, and the portable host is connected with the annular strain gauge, the heater and the ultrasonic transducer.
2. The ultrasonic axial force coefficient field calibration system for the high-strength bolt as recited in claim 1, wherein the heater comprises an electrothermal film and a thermocouple resistor, and the electrothermal film and the thermocouple resistor are coated on the screw to realize heating and temperature measurement of the screw.
3. The on-site calibration system for the ultrasonic axial force coefficient of the high-strength bolt as recited in claim 1, wherein the wire passing gasket comprises a wire passing groove for allowing a heater wire to pass out.
4. The ultrasonic on-site axial force coefficient calibration system for the high-strength bolt as claimed in claim 1, wherein the portable host comprises a temperature measurement control module, an axial force measurement control module, an ultrasonic measurement module and a calculation display module.
5. The ultrasonic axial force coefficient field calibration system for the high-strength bolt according to claim 1 is characterized in that: the system adopts a portable hydraulic pump and a hollow hydraulic cylinder to realize the field loading of the axial force of the bolt, and adopts an electric heating film and a thermocouple resistor to realize the field control of the temperature.
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CN202011013575.9A CN112033602A (en) | 2020-09-24 | 2020-09-24 | High-strength bolt ultrasonic axial force coefficient field calibration system |
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CN202011013575.9A CN112033602A (en) | 2020-09-24 | 2020-09-24 | High-strength bolt ultrasonic axial force coefficient field calibration system |
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Citations (7)
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US4292835A (en) * | 1980-02-25 | 1981-10-06 | Raymond Engineering, Inc. | Calibration apparatus and method for strain measuring instruments |
CN200985797Y (en) * | 2006-07-28 | 2007-12-05 | 北京中煤矿山工程有限公司 | Anchor rod preloader |
CN102213628A (en) * | 2011-04-08 | 2011-10-12 | 武汉钢铁(集团)公司 | Site testing method for anchoring force of glass fiber reinforced plastic anchor rod |
CN106249777A (en) * | 2016-09-29 | 2016-12-21 | 合肥工业大学 | A kind of surface temperature control system of ultrasonic probe |
CN110374003A (en) * | 2019-07-04 | 2019-10-25 | 中铁大桥科学研究院有限公司 | A kind of cord clip of suspension bridge screw rod axle power synchronous construction system and its application method |
CN111238702A (en) * | 2020-04-07 | 2020-06-05 | 国电科学技术研究院有限公司 | Bolt axial stress testing device and testing method based on ultrasonic measurement |
CN111693190A (en) * | 2020-08-06 | 2020-09-22 | 浙江中自庆安新能源技术有限公司 | Bolt axial stress measuring device and method based on ultrasonic waves |
-
2020
- 2020-09-24 CN CN202011013575.9A patent/CN112033602A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4292835A (en) * | 1980-02-25 | 1981-10-06 | Raymond Engineering, Inc. | Calibration apparatus and method for strain measuring instruments |
CN200985797Y (en) * | 2006-07-28 | 2007-12-05 | 北京中煤矿山工程有限公司 | Anchor rod preloader |
CN102213628A (en) * | 2011-04-08 | 2011-10-12 | 武汉钢铁(集团)公司 | Site testing method for anchoring force of glass fiber reinforced plastic anchor rod |
CN106249777A (en) * | 2016-09-29 | 2016-12-21 | 合肥工业大学 | A kind of surface temperature control system of ultrasonic probe |
CN110374003A (en) * | 2019-07-04 | 2019-10-25 | 中铁大桥科学研究院有限公司 | A kind of cord clip of suspension bridge screw rod axle power synchronous construction system and its application method |
CN111238702A (en) * | 2020-04-07 | 2020-06-05 | 国电科学技术研究院有限公司 | Bolt axial stress testing device and testing method based on ultrasonic measurement |
CN111693190A (en) * | 2020-08-06 | 2020-09-22 | 浙江中自庆安新能源技术有限公司 | Bolt axial stress measuring device and method based on ultrasonic waves |
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Application publication date: 20201204 |