CN113700700A - Device and method for measuring displacement of piston cylinder of prestress jack - Google Patents
Device and method for measuring displacement of piston cylinder of prestress jack Download PDFInfo
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- CN113700700A CN113700700A CN202110993689.2A CN202110993689A CN113700700A CN 113700700 A CN113700700 A CN 113700700A CN 202110993689 A CN202110993689 A CN 202110993689A CN 113700700 A CN113700700 A CN 113700700A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 37
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- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims description 33
- 238000004891 communication Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 18
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- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000003921 oil Substances 0.000 description 24
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- 238000012544 monitoring process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- 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
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- 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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- Measuring Arrangements Characterized By The Use Of Fluids (AREA)
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Abstract
The invention belongs to the technical field of prestressed jacks and particularly discloses a device for measuring displacement of a piston cylinder of a prestressed jack 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 displacement of a piston cylinder of a prestressed jack.
Background
In engineering construction, the hydraulic jack is widely applied to various scenes such as jacking translation of buildings, supporting of engineering structures, hoisting and traction of structural members, various types of load tests, prestress application of structures and the like as basic tool equipment. In the use process of the general jack for engineering use, unilateral parameter indexes are usually only required to be concerned, such as a displacement index is only concerned in jacking translation, and a load index is only concerned in supporting and hoisting. The prestressed jack is a special jack for tensioning prestressed tendons such as steel strands, the prestressed jack is a through hydraulic double-acting jack, the prestressed jack needs to be matched with a high-pressure oil pump for use, and the power for tensioning and jacking is provided by high-pressure oil of the high-pressure oil pump. The jack used for the prestress engineering has strong specificity, and is mainly characterized in the following aspects:
1. the dual attributes are: it is a construction machine and a measuring device.
2. Multi-parameter indexes are as follows: load, displacement, operating conditions, operating rate, etc.
Particularly, in the aspect of displacement measurement, at present, a contact type additional device is mostly adopted for displacement measurement, and the contact type additional device is easy to damage in the using process, so that the construction data is incomplete, and the control of the construction quality and the generation of a later data report form are difficult. And current displacement measurement device is not suitable for abominable complicated operating mode, because the operation space of abominable complicated operating mode, occasion restriction are many, and the installation of being inconvenient, with high costs is unfavorable for the use.
Disclosure of Invention
The invention aims to provide a device and a method for measuring and calculating the displacement of a piston cylinder of a prestressed jack, which are used for realizing the accurate measurement of the stroke displacement of the piston cylinder of the jack.
In order to achieve the purpose, the basic scheme of the invention is as follows: a displacement measuring device for a piston cylinder of a prestress 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 performing analog-to-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, data information is transmitted to the data processing module, pressure and flow numerical values are converted into electric signals, the signals are enhanced, and numerical value transmission is facilitated. And 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 conversion of pressure and flow volume solves the safety problem and inaccuracy problem in the manual measurement and direct measurement process. The technical scheme is also suitable for other severe complex working conditions, particularly occasions where the displacement measuring device is inconvenient to directly install but the displacement of the piston of the hydraulic oil cylinder needs to be measured, 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 integrally arranged or separately arranged.
The pressure sensor and the flow sensor are integrated into a whole, so that the integral installation and disassembly are convenient. The pressure sensor and the flow sensor are arranged in a split mode, so that the mounting positions of the pressure sensor and the flow sensor can be flexibly adjusted according to needs.
Furthermore, 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.
The analog-to-digital conversion and signal enhancement of the acquired information are sequentially realized, each signal is ensured to be preprocessed, and the subsequent signal transmission is facilitated.
The power supply module 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, and the control signal output end of the power supply management module is connected with the control end of the power supply module.
And a power supply system is adopted to ensure that the Internet of things terminal keeps running and automatically and continuously acquires data in the whole construction period. The power management module can control the start and stop of the power supply module, so that the power supply operation of the power supply module can be flexibly controlled, and the influence on the normal operation of other modules due to the waste of electric quantity or the untimely power supply is avoided.
The system further comprises a communication module, wherein the communication module comprises a wired communication unit or a wireless communication unit, and each module carries out information transmission through the communication module.
According to the selection of the wired communication unit or the wireless communication unit, the use is flexible.
Further, still include the casing, each module all sets up in the casing.
The shell is used for protecting equipment and avoiding the pollution of sewage, dust and the like in the external environment.
Furthermore, a groove is formed in one side of the shell and can be clamped at an oil inlet of the hydraulic system of the jack.
The shell is provided with a groove, and the groove is clamped with the oil inlet so as to be convenient for positioning.
The invention also provides a measurement calculation method for the displacement measurement device, which comprises the following steps:
s1, assuming that the pressure at the oil inlet of the jack hydraulic system is certain, namely the compression coefficient is certain, setting the pressure as k, and establishing a calculation formula of the volume of a medium flowing through the oil inlet of the jack and the elongation of a piston cylinder of the jack:
L＝(ax2+bx+c)k
wherein L is the elongation of a piston cylinder of the jack, x is the volume of a medium flowing through an oil inlet of the jack, and a, b and c are coefficients of a regression equation generated by calibration;
s2, setting the extension value of the piston cylinder of the jack to be fixed, namely the volume of the piston cylinder to be constant, setting the volume to be V, and establishing a calculation formula of the volume of the medium flowing through the oil inlet of the jack and the pressure intensity at the oil inlet of the jack:
wherein k is a compression coefficient, Δ V is a volume change amount, and Δ P is a pressure change amount;
s3, obtaining time t1And t2Corresponding volume V of medium flow through the oil inlet1And V2And pressure information F1And F2Then, the pressure information P is obtained by conversion according to the pressure information1And P2；
Will V1And V2Calculating difference to obtain Δ V, and calculating P1And P2Calculating difference to obtain delta P;
and inputting the delta V and the delta P into a calculation formula in S2 to obtain k, and inputting the k into a calculation formula in S1 to obtain the elongation of the piston cylinder of the jack.
The method is used for converting the pressure and flow volume signals into jack piston cylinder displacement signals, 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 pre-stressed jack according to the present invention;
FIG. 2 is a left side view of the displacement measuring device of the piston cylinder of the pre-stress jack of the present invention;
fig. 3 is a 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
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1-3, the invention discloses a displacement measuring device for a piston cylinder of a prestress jack,
the device comprises a data acquisition module 3, a data processing module 4 and a central processing module, and the accurate measurement of the stroke displacement of a piston cylinder of the jack is realized 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 installed 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 prestress jack and adopts non-contact measurement, 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 (adopting a resistance type pressure sensor 3.1) and a flow sensor 3.2, the pressure sensor 3.1 and the flow sensor 3.2 are integrally arranged or separately arranged, and the pressure sensor 3.1 and the flow sensor 3.2 can be integrally arranged on a circuit board and are convenient to move and install. The monitoring parameters of the flow sensor 3.2 can be expanded and applied, such as running 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 performing analog-to-digital conversion and signal enhancement processing on the information. The data processing module 4 comprises an analog-to-digital conversion unit (for example, an AD9634BCPZ-170 analog-to-digital converter is adopted) and a signal enhancement unit 1.1 (for example, a signal amplifier, a TS-9200 signal enhancer and the like), wherein the input end of the analog-to-digital conversion unit is electrically connected with the output end of the data acquisition module 3, the output end of the analog-to-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 travel displacement of the jack according to the pressure signal and the flow volume signal.
In a preferred scheme of the invention, the displacement measuring device for the piston cylinder of the prestress jack further comprises a power supply module 2.1 and a power supply management module 2, which are used for ensuring power supply. The power supply end of the power supply module 2.1 is electrically connected with each module respectively, 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 used for controlling the start and stop of the independent power supply module 2.1. The power supply module 2.1 adopts a high energy density battery, and the power management module 2 can adopt a control switch.
In a preferred scheme of the invention, the displacement measuring device for the piston cylinder of the prestress jack further comprises a communication module 1, wherein the communication module 1 comprises a wired communication unit or a wireless communication unit, and each module carries out information transmission through the communication module 1. The wired communication unit can adopt line connection modules such as optical fibers and cables, and the wireless communication unit adopts a WiFi communication module and a 2G/3G/4G network communication module. 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 device for measuring displacement of a piston cylinder of a jack further includes a housing, each module is disposed in the housing, and the housing can prevent external contaminants from contacting the device for measuring displacement of a piston cylinder of a jack, thereby protecting the device. The casing includes shell 5 and apron 6, and the casing bottom is equipped with recess 7, but 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 protective seat 1.3 and the fixed screw cap 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 the oil inlet of the jack hydraulic system is certain, namely the compression coefficient is certain, setting the pressure as k, and establishing a calculation formula of the volume of a medium flowing through the oil inlet of the jack and the elongation of a piston cylinder of the jack:
L＝(ax2+bx+c)k
wherein L is the elongation of a piston cylinder of the jack, x is the volume of a medium flowing through an oil inlet of the jack, and a, b and c are coefficients of a regression equation generated by calibration;
s2, setting the extension value of the piston cylinder of the jack to be fixed, namely the volume of the piston cylinder to be constant, setting the volume to be V, and establishing a calculation formula of the volume of the medium flowing through the oil inlet of the jack and the pressure intensity at the oil inlet of the jack:
wherein k is a compression coefficient, Δ V is a volume change amount, and Δ P is a pressure change amount;
s3, obtaining time t1And t2Corresponding volume V of medium flow through the oil inlet1And V2And pressure information F1And F2Then, the pressure information P is obtained by conversion according to the pressure information1And P2；
Will V1And V2Calculating difference to obtain Δ V, and calculating P1And P2Calculating difference to obtain delta P;
and inputting the delta V and the delta P into a calculation formula in S2 to obtain k, and inputting the k into a calculation formula in S1 to obtain the elongation of the piston cylinder of the jack.
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 do not necessarily 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.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A displacement measuring device for a piston cylinder of a prestress jack is characterized by comprising 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 performing analog-to-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 pre-stress jack piston cylinder displacement measuring device of claim 1, wherein the data acquisition module comprises a pressure sensor and a flow sensor, and the pressure sensor and the flow sensor are integrated or arranged separately.
3. The pre-stress jack piston cylinder displacement measuring device of claim 1, wherein the data processing module comprises an analog-to-digital conversion unit and a signal enhancement unit, an input end of the analog-to-digital conversion unit is connected with an output end of the data acquisition module, an output end of the analog-to-digital conversion unit is connected with an input end of the signal enhancement unit, and an output end of the signal enhancement unit is connected with the central processing module.
4. The device of claim 1, further comprising a power module and a power management module, wherein a power supply terminal of the power module is connected to each module, and a control signal output terminal of the power management module is connected to a control terminal of the power module.
5. The pre-stress jack piston cylinder displacement measurement device of claim 1, further comprising a communication module, the communication module comprising a wired communication unit or a wireless communication unit, each module performing information transmission through the communication module.
6. The pre-stress jack piston cylinder displacement measurement device of claim 1, further comprising a housing, each module disposed within the housing.
7. The device of claim 6, wherein the housing has a groove on one side, the groove being adapted to engage an oil inlet of a jack hydraulic system.
8. A measurement calculation method for the displacement measuring device according to any one of claims 1 to 7, characterized by comprising the steps of:
s1, assuming that the pressure at the oil inlet of the jack hydraulic system is certain, namely the compression coefficient is certain, setting the pressure as k, and establishing a calculation formula of the volume of a medium flowing through the oil inlet of the jack and the elongation of a piston cylinder of the jack:
L＝(ax2+bx+c)k
wherein L is the elongation of a piston cylinder of the jack, x is the volume of a medium flowing through an oil inlet of the jack, and a, b and c are coefficients of a regression equation generated by calibration;
s2, setting the extension value of the piston cylinder of the jack to be fixed, namely the volume of the piston cylinder to be constant, setting the volume to be V, and establishing a calculation formula of the volume of the medium flowing through the oil inlet of the jack and the pressure intensity at the oil inlet of the jack:
wherein k is a compression coefficient, Δ V is a volume change amount, and Δ P is a pressure change amount;
s3, obtaining time t1And t2Corresponding volume V of medium flow through the oil inlet1And V2And pressure information F1And F2Then, the pressure information P is obtained by conversion according to the pressure information1And P2；
Will V1And V2Calculating difference to obtain Δ V, and calculating P1And P2Calculating difference to obtain delta P;
and inputting the delta V and the delta P into a calculation formula in S2 to obtain k, and inputting the k into a calculation formula in S1 to obtain the elongation of the piston cylinder 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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| CN113700700B CN113700700B (en) | 2024-04-05 |
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| US20010037689A1 (en) * | 2000-03-08 | 2001-11-08 | Krouth Terrance F. | Hydraulic actuator piston measurement apparatus and method |
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