CN113700700B - Device and method for measuring displacement of piston cylinder of prestressing jack - Google Patents
Device and method for measuring displacement of piston cylinder of prestressing jack Download PDFInfo
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- CN113700700B CN113700700B CN202110993689.2A CN202110993689A CN113700700B CN 113700700 B CN113700700 B CN 113700700B CN 202110993689 A CN202110993689 A CN 202110993689A CN 113700700 B CN113700700 B CN 113700700B
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 39
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- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims description 33
- 238000004891 communication Methods 0.000 claims description 28
- 238000004364 calculation method Methods 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 15
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- 238000000691 measurement method Methods 0.000 claims 2
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Measuring Arrangements Characterized By The Use Of Fluids (AREA)
- Actuator (AREA)
Abstract
The invention belongs to the technical field of prestressed jacks, and particularly discloses a prestressed jack piston cylinder displacement measuring device and a measuring and calculating method. By adopting the technical scheme, the accurate measurement of the stroke displacement of the jack piston cylinder is realized through the cooperation of the modules.
Description
Technical Field
The invention belongs to the technical field of prestressed jacks, and relates to a device and a method for measuring and calculating displacement of a piston cylinder of a prestressed jack.
Background
In engineering construction, the hydraulic jack is used as basic tool equipment and is widely applied to various scenes, such as lifting and translation of a building, supporting of an engineering structure, hoisting and traction of a structural member, various load tests, prestress application of the structural member and the like. In the use process of the jack for general engineering, only unilateral parameter indexes are usually required to be paid attention to, for example, jacking translation only pays attention to displacement indexes, and supporting and hoisting only pays attention to load indexes. The prestressing jack is a special jack for stretching prestressing tendons such as steel strands, the prestressing jack is a through hydraulic double-acting jack, the prestressing jack is matched with a high-pressure oil pump to be used, and stretching and jacking power is provided by high-pressure oil of the high-pressure oil pump. The jack for prestress engineering has strong specificity, and is mainly characterized in the following aspects:
1. dual attributes: the device is not only a construction machine, but also a metering device.
2. Multi-parameter index: load, displacement, operating conditions, operating rate, etc.
In particular, in the aspect of displacement measurement, the contact type additional device is mostly adopted for displacement measurement at present, and the contact type additional device is easy to damage in the use process, so that construction data is incomplete, and difficulty is caused to control of construction quality and generation of a later data report. And the existing displacement measuring device is not suitable for severe and complex working conditions, is inconvenient to install due to the fact that the working space and occasion of the severe and complex working conditions are limited, and is high in cost and unfavorable for use.
Disclosure of Invention
The invention aims to provide a device and a method for measuring and calculating displacement of a piston cylinder of a prestressed jack, which realize accurate measurement of stroke displacement of the piston cylinder of the jack.
In order to achieve the above purpose, the basic scheme of the invention is as follows: the displacement measuring device for the piston cylinder of the prestressed jack comprises a data acquisition module, a data processing module and a central processing module;
the data acquisition module is used for acquiring pressure and flow information of the jack hydraulic system;
the input end of the data processing module is connected with the output end of the data acquisition module, and the data processing module is used for acquiring acquired information and carrying out analog-digital conversion and signal enhancement processing on the information;
the input end of the central processing module is connected with the output end of the data processing module, and the central processing module is used for receiving the processed information and converting the processed information into the stroke displacement of the jack.
The working principle and the beneficial effects of the basic scheme are as follows: the data acquisition module is used for acquiring corresponding data, transmitting data information to the data processing module, converting pressure and flow values into electric signals, enhancing the signals and being beneficial to value transmission. The central processing module analyzes and calculates the acquired pressure and flow information, acquires the stroke displacement of the jack piston cylinder, and realizes the accurate measurement of the stroke displacement of the jack piston cylinder. The pressure and flow volume conversion solves the safety problem and the inaccuracy problem in the manual measurement and direct measurement processes. The technical scheme is also suitable for other severe complex working conditions, especially for occasions in which the displacement measuring device is inconvenient to directly install, but the displacement of the piston of the hydraulic cylinder is required to be measured and positioned or controlled.
Further, the data acquisition module comprises a pressure sensor and a flow sensor, and the pressure sensor and the flow sensor are integrated into a whole or are arranged in a split mode.
The pressure sensor and the flow sensor are integrated into a whole, so that the integrated installation and the disassembly are convenient. The pressure sensor and the flow sensor are arranged in a split mode, and the mounting positions of the pressure sensor and the flow sensor can be flexibly adjusted according to requirements.
Further, the data processing module comprises an analog-to-digital conversion unit and a signal enhancement unit, wherein the input end of the analog-to-digital conversion unit is connected with the output end of the data acquisition module, the output end of the analog-to-digital conversion unit is connected with the input end of the signal enhancement unit, and the output end of the signal enhancement unit is connected with the central processing module.
Analog-to-digital conversion and signal enhancement of the acquired information are sequentially realized, each signal is guaranteed to be preprocessed, and subsequent signal transmission is facilitated.
Further, the intelligent power supply system further comprises a power supply module and a power supply management module, wherein the power supply end of the power supply module is connected with each module respectively, and the control signal output end of the power supply management module is connected with the control end of the power supply module.
The power supply system is adopted, so that the Internet of things terminal in the scheme can be ensured to keep running in the whole construction period, and data can be automatically and continuously collected. The power management module can control the start and stop of the power supply module, is convenient for flexibly controlling the power supply operation of the power supply module, and avoids the influence on the normal operation of other modules caused by the waste of electric quantity or untimely power supply.
Further, the wireless communication system further comprises a communication module, wherein the communication module comprises a wired communication unit or a wireless communication unit, and the communication module is used for transmitting information.
And the wireless communication unit is flexibly used according to the selection of the wired communication unit or the wireless communication unit.
Further, the device also comprises a shell, and each module is arranged in the shell.
The shell is used for protecting equipment and avoiding pollution to the equipment by sewage, dust and the like in the external environment.
Further, a groove is formed in one side of the shell, and the groove can be clamped at an oil inlet of the jack hydraulic system.
The shell is provided with the groove, and the groove is clamped with the oil inlet, so that the positioning is convenient.
The invention also provides a measurement calculation method for the displacement measurement device, which comprises the following steps:
s1, assuming that the pressure at an oil inlet of a jack hydraulic system is certain, namely the compression coefficient is certain, setting k, and establishing a calculation formula of the volume of a medium flowing through an oil inlet of the jack and the elongation of a piston cylinder of the jack:
L＝(ax 2 +bx+c)k
wherein L is the elongation of a jack piston cylinder, x is the volume of a medium flowing through an oil inlet of the jack, and a, b and c are coefficients of regression equations generated by calibration;
s2, setting the fixed extension value of the jack piston cylinder, namely setting the fixed volume of the piston cylinder as V, and establishing a calculation formula of the volume of the medium flowing through the jack oil inlet and the pressure at the jack oil inlet:
where k is a compression coefficient, Δv is a volume change amount, and Δp is a pressure change amount;
s3, acquiring time t 1 And t 2 Corresponding medium flow volume V passing through the oil inlet 1 And V 2 And pressure information F 1 And F 2 Then converting according to the pressure information to obtain pressure information P 1 And P 2 ；
Will V 1 And V 2 Performing difference calculation to obtain DeltaV, and simultaneously adding P 1 And P 2 Performing difference calculation to obtain delta P;
inputting DeltaV and DeltaP into a calculation formula in S2 to obtain k, and inputting k into a calculation formula in S1 to obtain the extension of the jack piston cylinder.
The method is used for converting the pressure and flow volume signals into the displacement signals of the jack piston cylinder, is simple to operate and is beneficial to use.
Drawings
FIG. 1 is a perspective view of a displacement measuring device for a piston cylinder of a prestressing jack according to the present invention;
FIG. 2 is a left side view of the displacement measuring device of the piston cylinder of the prestressing jack of the present invention;
fig. 3 is a cross-sectional view A-A of fig. 2.
Reference numerals in the drawings of the specification include: communication module 1, signal enhancement unit 1.1, fixation nut 1.2, fixed protection seat 1.3, power management module 2, power module 2.1, data acquisition module 3, pressure sensor 3.1, flow sensor 3.2, data processing module 4, shell 5, apron 6, recess 7.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
As shown in fig. 1-3, the present invention discloses a pre-stress jack piston cylinder displacement measuring device,
the hydraulic pressure measuring device comprises a data acquisition module 3, a data processing module 4 and a central processing module, and is used for realizing accurate measurement of the stroke displacement of the jack piston cylinder through hydraulic pressure compensation and flow volume conversion. When the device is used, the jack is connected with the high-pressure oil pump through the high-pressure oil pipe, the device is arranged at a certain position of the oil pipe, and the high-pressure oil pump is started to supply oil to the jack.
The data acquisition module 3 is arranged on an oil pipe passage of the pre-stress jack, non-contact measurement is adopted, and the data acquisition module 3 is used for acquiring pressure and flow information of a hydraulic system of the jack. The data acquisition module 3 comprises a pressure sensor 3.1 (such as a resistance type pressure sensor 3.1) and a flow sensor 3.2, wherein the pressure sensor 3.1 and the flow sensor 3.2 are integrated into a whole or are arranged in a split mode, and the pressure sensor 3.1 and the flow sensor 3.2 can be integrally arranged on a circuit board so as to be convenient to move and install. The monitoring parameters of the flow sensor 3.2 can also be expanded and applied, such as operation state monitoring, fault diagnosis, hydraulic medium monitoring and the like according to the flow parameters.
The input end of the data processing module 4 is electrically connected with the output end of the data acquisition module 3, and the data processing module 4 is used for acquiring acquired information and carrying out analog-digital conversion and signal enhancement processing on the information. The data processing module 4 comprises an analog-digital conversion unit (such as an AD9634BCPZ-170 analog-digital converter) and a signal enhancement unit 1.1 (such as a signal amplifier, a TS-9200 signal enhancer and the like), wherein the input end of the analog-digital conversion unit is electrically connected with the output end of the data acquisition module 3, the output end of the analog-digital conversion unit is electrically connected with the input end of the signal enhancement unit 1.1, and the output end of the signal enhancement unit 1.1 is electrically connected with the central processing module.
The input end of the central processing module is electrically connected with the output end of the data processing module 4, and the central processing module is used for receiving the processed information and calculating and converting the stroke displacement of the jack according to the pressure signal and the flow volume signal.
In a preferred scheme of the invention, the pre-stress jack piston cylinder displacement measuring device also comprises a power supply module 2.1 and a power management module 2, and is used for ensuring power supply. The power supply end of the power supply module 2.1 is respectively and electrically connected with each module, and the control signal output end of the power management module 2 is electrically connected with the control end of the power supply module 2.1 and is used for controlling the starting and stopping of the independent power supply module 2.1. The power supply module 2.1 is a high-energy-density battery, and the power management module 2 can adopt a control switch.
In a preferred scheme of the invention, the pre-stress jack piston cylinder displacement measuring device further comprises a communication module 1, wherein the communication module 1 comprises a wired communication unit or a wireless communication unit, and each module transmits information through the communication module 1. The wired communication unit can adopt line connection modules such as optical fibers, cables and the like, and the wireless communication unit adopts WiFi communication modules, 2G/3G/4G network communication modules and the like. The communication module 1 is also provided with a signal enhancement unit 1.1 for improving the information transmission effect.
As shown in fig. 1 and 2, in a preferred embodiment of the present invention, the pre-stress jack piston cylinder displacement measurement device further includes a housing, each module is disposed in the housing, and the housing can prevent external contaminants from contacting with the pre-stress jack piston cylinder displacement measurement device, thereby protecting the device. The casing includes shell 5 and apron 6, and the casing bottom is equipped with recess 7, and recess 7 joint is in jack hydraulic system's oil inlet department, the installation location of being convenient for. The communication module 1 and the signal enhancement unit 1.1 arranged on the communication module 1 are arranged on the shell 5 through the fixed protection seat 1.3 and the fixed nut 1.2, and the installation is stable.
The invention also provides a measurement calculation method for the displacement measurement device, which comprises the following steps:
s1, assuming that the pressure at an oil inlet of a jack hydraulic system is certain, namely the compression coefficient is certain, setting k, and establishing a calculation formula of the volume of a medium flowing through an oil inlet of the jack and the elongation of a piston cylinder of the jack:
L＝(ax 2 +bx+c)k
wherein L is the elongation of a jack piston cylinder, x is the volume of a medium flowing through an oil inlet of the jack, and a, b and c are coefficients of regression equations generated by calibration;
s2, setting the fixed extension value of the jack piston cylinder, namely setting the fixed volume of the piston cylinder as V, and establishing a calculation formula of the volume of the medium flowing through the jack oil inlet and the pressure at the jack oil inlet:
where k is a compression coefficient, Δv is a volume change amount, and Δp is a pressure change amount;
s3, acquiring time t 1 And t 2 Corresponding medium flow volume V passing through the oil inlet 1 And V 2 And pressure information F 1 And F 2 Then converting according to the pressure information to obtain pressure information P 1 And P 2 ；
Will V 1 And V 2 Performing difference calculation to obtain DeltaV, and simultaneously adding P 1 And P 2 Performing difference calculation to obtain delta P;
inputting DeltaV and DeltaP into a calculation formula in S2 to obtain k, and inputting k into a calculation formula in S1 to obtain the extension of the jack piston cylinder.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. The measuring and calculating method of the pre-stress jack piston cylinder displacement measuring device is characterized by comprising the following steps of:
s1, assuming that the pressure at an oil inlet of a jack hydraulic system is certain, namely the compression coefficient is certain, setting k, and establishing a calculation formula of the volume of a medium flowing through an oil inlet of the jack and the elongation of a piston cylinder of the jack:
L＝(ax 2 +bx+c)k
wherein L is the elongation of a jack piston cylinder, x is the volume of a medium flowing through an oil inlet of the jack, and a, b and c are coefficients of regression equations generated by calibration;
s2, setting the fixed extension value of the jack piston cylinder, namely setting the fixed volume of the piston cylinder as V, and establishing a calculation formula of the volume of the medium flowing through the jack oil inlet and the pressure at the jack oil inlet:
where k is a compression coefficient, Δv is a volume change amount, and Δp is a pressure change amount;
s3, acquiring time t 1 And t 2 The corresponding V: medium flow volume V through volume inlet 1 And V 2 And pressure information F 1 And F 2 And then, according to the pressure information, changing delta to calculate P: obtaining pressure information P 1 And P 2 ；
Will V 1 And V 2 Performing difference calculation to obtain DeltaV, and simultaneously adding P 1 And P 2 Performing difference calculation to obtain delta P;
inputting DeltaV and DeltaP into a calculation formula in S2 to obtain k, and inputting k into a calculation formula in S1 to obtain the elongation of a jack piston cylinder;
the pre-stress jack piston cylinder displacement measuring device comprises a data acquisition module, a data processing module and a central processing module;
the data acquisition module is used for acquiring pressure and flow information of the jack hydraulic system;
the input end of the data processing module is connected with the output end of the data acquisition module, and the data processing module is used for acquiring acquired information and carrying out analog-digital conversion and signal enhancement processing on the information;
the input end of the central processing module is connected with the output end of the data processing module, and the central processing module is used for receiving the processed information and converting the processed information into the stroke displacement of the jack.
2. The method for measuring and calculating the displacement of the piston cylinder of the prestressing jack according to claim 1, wherein the data acquisition module comprises a pressure sensor and a flow sensor which are integrally arranged or separately arranged.
3. The measurement and calculation method of the pre-stress jack piston cylinder displacement measurement device according to claim 1, wherein the data processing module comprises an analog-to-digital conversion unit and a signal enhancement unit, the input end of the analog-to-digital conversion unit is connected with the output end of the data acquisition module, the output end of the analog-to-digital conversion unit is connected with the input end of the signal enhancement unit, and the output end of the signal enhancement unit is connected with the central processing module.
4. The measurement and calculation method of the pre-stress jack piston cylinder displacement measurement device according to claim 1, further comprising a power supply module and a power management module, wherein a power supply end of the power supply module is connected with each module respectively, and a control signal output end of the power management module is connected with a control end of the power supply module.
5. The method of measuring and calculating a displacement measuring device of a piston cylinder of a prestressed jack according to claim 1, further comprising a communication module, wherein the communication module comprises a wired communication unit or a wireless communication unit, and each module transmits information through the communication module.
6. A method of calculating a displacement measurement of a piston cylinder of a prestressed jack according to claim 1, further comprising a housing, each module being disposed within the housing.
7. The method of measuring and calculating the displacement of the piston cylinder of the prestressed jack according to claim 6, wherein a groove is formed on one side of the housing, and the groove can be clamped at the oil inlet of the hydraulic system of the jack.
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| CN202110993689.2A CN113700700B (en) | 2021-08-27 | 2021-08-27 | Device and method for measuring displacement of piston cylinder of prestressing jack |
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| CN202110993689.2A CN113700700B (en) | 2021-08-27 | 2021-08-27 | Device and method for measuring displacement of piston cylinder of prestressing jack |
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| JP2005164449A (en) * | 2003-12-04 | 2005-06-23 | Ishikawajima Harima Heavy Ind Co Ltd | Device for measuring servo-valve characteristics |
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| CN113700700A (en) | 2021-11-26 |
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