CN216558734U

CN216558734U - Double-extensometer reinforcing steel bar residual deformation measuring device

Info

Publication number: CN216558734U
Application number: CN202220117050.8U
Authority: CN
Inventors: 林潇; 陈海生; 张海鑫; 李闯
Original assignee: Suzhou Tiema Automation Technology Co ltd
Current assignee: Suzhou Tiema Automation Technology Co ltd
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-05-17
Anticipated expiration: 2032-01-17

Abstract

The application relates to a two extensometers reinforcing bar residual deformation measuring device, include: the measuring instrument comprises a shell, a main control board arranged in the shell and a panel arranged on the shell, wherein two sensor interfaces connected with the main control board are arranged on the shell; the power supply assembly supplies power to the measuring instrument; the two extensometers are connected with the two sensor interfaces in a one-to-one manner; the two extensometers are symmetrically arranged on the steel bar to be measured and measure the residual deformation value of the steel bar to be measured; after the main control board receives the voltage signals sent by the two extensometers, the digital-to-analog conversion circuit unit converts the voltage signals into residual deformation code values and sends the residual deformation code values to the touch screen for displaying. Through two extensometers measurement residual deformation, simple structure, convenient operation and measurement accuracy are high, and after the measurement was accomplished, the touch-sensitive screen can show residual deformation numerical value, raises the efficiency.

Description

Double-extensometer reinforcing steel bar residual deformation measuring device

Technical Field

The utility model relates to a double-extensometer reinforcing steel bar residual deformation measuring device, and belongs to the technical field of reinforcing steel bar detection equipment.

Background

The residual deformation of the steel bar is also called unrecoverable deformation, the steel bar deforms when loaded, the deformation can only be partially recovered after unloading, and the deformation which cannot be recovered is called residual deformation. The working principle of the steel bar mechanical connection technology is that force is transmitted through the mechanical meshing action of the steel bars and the connecting pieces or the pressure bearing action of the end faces of the steel bars. The method has the advantages of simple process, industrial production, small environmental pollution, stable and reliable joint quality, steel and energy conservation and the like, and is widely applied to building engineering. The national people's republic of China industry standard JGJ107-2010 technical Specification for mechanical connection of reinforcing steel bars sets a regulation on the performance index of the detection of the residual deformation of the mechanical connection of the reinforcing steel bars.

The existing measuring method for residual deformation generally adopts the steps of dotting or marking the gauge length of the steel bar, and then performing a tensile test on the steel bar. And (4) subtracting the original gauge length from the measured distance between the dotting line and the scribing line to obtain a residual deformation value. This method requires manual measurement and calculation of the residual deformation value. An auxiliary measuring device is also adopted, for example, a measuring device adopting a displacement sensor is adopted, the displacement sensor measuring device needs to be installed and clamped according to the original dotting or marking position, and the assembly and disassembly are not very convenient; the whole device is provided with screws of different models, wrenches of different models are used for fastening, the operation is complex, the loading and unloading time is prolonged, and the measurement accuracy is low.

Disclosure of Invention

Therefore, the utility model aims to provide the reinforcing steel bar residual deformation measuring device which is simple to operate and high in measuring precision.

In order to achieve the purpose, the utility model provides the following technical scheme: a double extensometer reinforcing bar residual deformation measuring device includes:

the measuring instrument comprises a shell, a main control board arranged in the shell and a panel arranged on the shell, wherein two sensor interfaces connected with the main control board are arranged on the shell, a first serial port and a digital-to-analog conversion circuit unit are arranged on the main control board, a touch screen is embedded on the panel, and the touch screen is connected with the main control board through the first serial port;

the power supply assembly supplies power to the measuring instrument; and

the two extensometers are connected with the two sensor interfaces in a one-to-one manner; the two extensometers are symmetrically arranged on the steel bar to be measured and measure the residual deformation value of the steel bar to be measured; after the main control board receives the voltage signals sent by the two extensometers, the digital-to-analog conversion circuit unit converts the voltage signals into residual deformation code values and sends the residual deformation code values to the touch screen for displaying.

Further, the power supply assembly is a lithium battery pack and/or an external power supply arranged in the shell.

Furthermore, a charging interface connected with the lithium battery pack and a switch for connecting or disconnecting the external power supply and the lithium battery pack are arranged on the shell.

And the control end is connected with the main control board through the other serial port.

Furthermore, the measuring instrument further comprises a plurality of mechanical keys arranged on the panel and a key circuit board arranged below the mechanical keys, and the key circuit board is connected with the main control board.

Further, the gauge length of the two extensometers is adjustable.

The utility model has the beneficial effects that: this application is installed in the both sides of reinforcing bar through setting up two extensometers symmetries and is measured the residual deformation value of reinforcing bar, the main control board receives two behind the voltage signal that the extensometer sent, digital-to-analog conversion circuit unit converts voltage signal into residual deformation sign value and sends for the touch-sensitive screen shows. Because the principle of extensometer is simple, simple to operate and detection accuracy is high for measuring device's simple structure, convenient operation and measurement accuracy are high, and simultaneously through setting up the touch-sensitive screen, after the measurement is accomplished, the data that the reinforcing bar residual deformation that the touch-sensitive screen can direct display measurement obtained improves measurement of efficiency.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

Fig. 1 is a schematic cross-sectional structure view of a device for measuring residual deformation of a steel bar with two extensometers according to an embodiment of the present invention;

FIG. 2 is a schematic view of the measuring instrument shown in FIG. 1;

fig. 3 is a schematic view of another view of the measuring instrument shown in fig. 2.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

Referring to fig. 1 and 2, a device for measuring residual deformation of a reinforcing bar with two extensometers according to an embodiment of the present invention includes a measuring instrument 10, a power supply assembly 50, and two extensometers 30. The measuring instrument 10 comprises a shell 1, a main control board 2 arranged in the shell 1 and a panel 3 arranged on the shell 1, wherein two sensor interfaces (not shown) connected with the main control board 2 are arranged on the shell 1, a first serial port (not shown) and a digital-to-analog conversion circuit unit (not shown) are arranged on the main control board 2, a touch screen 31 is embedded on the panel 3, and the touch screen 31 is connected with the main control board 2 through the first serial port. The power supply assembly 50 supplies power to the measuring instrument 10. The two extensometers 30 and the two sensor interfaces are connected in a one-to-one manner; the two extensometers 30 are symmetrically arranged on a steel bar to be measured (not shown) and measure the residual deformation value of the steel bar to be measured; after the main control board 2 receives the voltage signals sent by the two extensometers 30, the digital-to-analog conversion circuit unit converts the voltage signals into residual deformation code values and sends the residual deformation code values to the touch screen 31 for displaying. Because the principle of extensometer 30 is simple, simple to operate and detection accuracy is high for this two extensometer reinforcing bar residual deformation measuring device's simple structure, convenient operation and measurement accuracy are high, and simultaneously through setting up touch-sensitive screen 31, after the measurement is accomplished, touch-sensitive screen 31 can the direct display measured residual deformation's data, improves measurement of efficiency.

It should be noted that, the extensometer 30 is a prior art device, and the extensometer 30 is an instrument for measuring the line deformation between two points of a member and other objects, and is generally composed of three parts, namely a sensor, an amplifier and a recorder. The sensor is in direct contact with the member being measured. The initial distance between two points to be measured on the component is the gauge length, and the change of the gauge length is the line deformation. The member is deformed, the sensor is deformed, the deformation is converted into mechanical, optical, electrical, acoustic and other information, the amplifier amplifies the micro signal output by the sensor, and the recorder directly displays or automatically records the amplified signal. In this embodiment, the amplified signal is transmitted to the main control board 2 through two sensor interfaces. When the two extensometers 30 are used for measurement, the two extensometers need to be symmetrically installed on two sides of the steel bar to be measured, the tensile force arranged on the steel bar to be measured is loaded to 60% of the yield strength from the set initial force value, and then the average value of the data measured by the two extensometers 30 is the residual deformation parameter of the steel bar to be measured after the tensile force is unloaded to the initial force value. The digital-to-analog conversion circuit unit is a device or circuit for converting discrete digital quantity into analog quantity with variable connection by adopting the prior art, and the principle, composition and function of the digital-to-analog conversion circuit unit are well known to those skilled in the art and are not described herein again.

The first serial port adopts the prior art, and the serial port is also called a serial communication interface or a serial communication interface and is an expansion interface adopting a serial communication mode. The main control board 2 and the touch screen 31 perform data interaction through the first serial port. The serial port is characterized in that the communication line is simple, two-way communication can be realized only by one pair of transmission lines, so that the cost is greatly reduced, and the working principle and the structure of the serial port are well known by those skilled in the art and are not described herein in detail.

The touch screen 31 is a conventional touch screen or touch panel, and is an inductive liquid crystal display device capable of receiving input signals such as a touch, and when a graphical button on the screen is touched, the tactile feedback system on the screen can drive various connecting devices according to a pre-programmed program, and a vivid video effect is produced by the liquid crystal display screen. In this embodiment, the touch screen 31 is internally provided with embedded software, which can implement functions such as data processing, result display, report processing, test setting, etc., the dual extensometer reinforcing steel bar residual deformation measurement device displays a residual deformation value on the touch screen 31 through a graphical interface, which is a computer operation user interface displayed in a graphical manner.

In the present embodiment, the power supply assembly 50 is a lithium battery pack 51 and an external power supply 52 disposed in the housing 1. Specifically, the case 1 is provided with a charging interface 53 connected to the lithium battery pack 51 and a switch 54 for connecting or disconnecting the external power supply 52 to or from the lithium battery pack 51. Lithium cell group 51 sets up in casing 1, can directly give measuring instrument 10 power supply, and external power source 52 is connected with measuring instrument 10 through charging interface 53, and it can charge or directly give measuring instrument 10 power supply for lithium cell group 51. Through setting up lithium cell group 51 and external power source 52 cooperation and using for measuring instrument 10 has dual power supply protection, and lithium cell group 51 can store the electric energy, and when lithium cell group 51 electric quantity exhausts, can give measuring instrument 10 power supply and charge for lithium cell group 51 through external power source 52, avoids influencing the use because of having a power failure or lithium cell group 51 electric quantity exhausts.

In this embodiment, two extensometers reinforcing bar residual deformation measuring device still includes control end 100, is provided with the second serial ports 11 of being connected with main control board 2 on the casing 1, and control end 100 passes through second serial ports 11 with main control board 2 and is connected. The control end 100 can be a computer or a mobile phone by adopting the prior art, the control end 100 is connected with the second serial port 11, so that the main control board 2 can be connected and communicated with the special software of the control end 100, the loading process and the residual deformation parameter acquisition are synchronously completed and recorded, a report is generated at the same time, and the measurement efficiency is further improved.

The measuring instrument 10 further includes a plurality of mechanical keys 32 disposed on the panel 3 and a key circuit board (not shown) disposed below the mechanical keys 32, and the key circuit board is connected to the main control board 2. Specifically, the key circuit board is disposed below the mechanical key 32 to sense when the mechanical key 32 is pressed and determine which of the pressed mechanical keys 32 is pressed, so that the main control board 2 can collect the state of the mechanical key 32 in real time. Through setting up mechanical button 32 and touch-sensitive screen 31 cooperation use to when making touch-sensitive screen 31 trouble, can play dual guarantee's effect through mechanical button 32 control measuring instrument 10.

It should be noted that the main control board 2 further includes a main chip basic circuit unit, a battery charging/discharging management circuit unit, a serial port communication circuit unit, an input circuit unit and an output circuit unit, wherein the battery charging/discharging circuit unit is used for calculating the SOC electric quantity parameter of the lithium battery pack 51 in real time; the input circuit unit is used for acquiring the state of the mechanical key 32 and the charge-discharge state parameters of the lithium battery pack 51 in real time. The output circuit controls the touch screen 31 to supply power according to the SOC electric quantity parameter of the lithium battery pack 51; the serial communication circuit unit is used for realizing information bidirectional intercommunication between the touch screen 31 and the main control board 2 and between the control terminal 100 and the main control board 2. The collected relevant parameters can be displayed through the touch screen 31, so that the user can know the use condition of the measuring instrument 10 and the measurement data of the two extensometers 30 conveniently.

The gauge length of the two extensometers 30 is adjustable. In this embodiment, the gauge length adjusting range of the two extensometers 30 is 50mm to 260mm, and the gauge length of the two extensometers 30 can be set to be 1 to 6 times of the diameter of the steel bar to be measured. The gauge length is used for determining the original length of the part of the steel bar to be measured with the strain or length change of the steel bar to be measured, the gauge lengths of the two extensometers 30 are adjustable, so that the extensometers can be suitable for steel bars with more sizes, the use efficiency is improved, and meanwhile, the corresponding gauge length value is adjusted according to different steel bars to be measured, and the measurement accuracy can be further improved.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. The utility model provides a two extensometers reinforcing bar residual deformation measuring device which characterized in that includes:

the power supply assembly supplies power to the measuring instrument; and

2. The device for measuring the residual deformation of the reinforcing steel bar by the double extensometers as recited in claim 1, wherein the power supply assembly comprises a lithium battery pack and an external power supply which are arranged in the shell.

3. The device for measuring the residual deformation of the reinforcing steel bar with the double extensometers as recited in claim 2, wherein the shell is provided with a charging interface connected with the lithium battery pack and a switch for connecting or disconnecting the external power supply with the lithium battery pack.

4. The device for measuring the residual deformation of the steel bar by the double extensometers as recited in claim 1, further comprising a control end, wherein the shell is provided with a second serial port connected with the main control board, and the control end is connected with the main control board through the second serial port.

5. The device for measuring the residual deformation of the reinforcing steel bar by the double extensometers as recited in claim 1, wherein the measuring instrument further comprises a plurality of mechanical keys arranged on the panel and a key circuit board arranged below the mechanical keys, and the key circuit board is connected with the main control board.

6. The apparatus of claim 1, wherein the gauge length of the two extensometers is adjustable.