CN114324837A - Contact method concrete expansion and contraction detection device and method based on laser ranging - Google Patents
Contact method concrete expansion and contraction detection device and method based on laser ranging Download PDFInfo
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- 238000012360 testing method Methods 0.000 claims abstract description 74
- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 238000012937 correction Methods 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 6
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
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Abstract
The utility model provides a contact method concrete expansion and contraction detection device and method based on laser ranging, which comprises a base, a laser ranging component, a driving mechanism and a correcting mechanism, wherein the laser ranging component, the driving mechanism and the correcting mechanism are arranged on the base; the driving mechanism and the laser ranging assembly are oppositely arranged on the base to form a placing space of the test piece, and the driving mechanism is used for clamping the test piece; the correcting mechanism is arranged along the setting direction of the test piece. Through setting up aligning gear and can realizing rectifying before measuring at every turn, reduce human error, can guarantee the center pin and in the measuring direction, improved the rate of accuracy that detects.
Description
Technical Field
The disclosure relates to the technical field of concrete deformation detection, in particular to a contact method concrete expansion and contraction detection device and method based on laser ranging.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The concrete expansion and contraction detection device is a special device for measuring the volume or length change of a concrete sample in the hardening process. The concrete material is influenced by the external environment and the characteristics of the material in the early setting stage or the hardening process, and the volume of the concrete material is changed. The volume change of the concrete material can seriously affect the stability, durability and bearing capacity of the concrete structure, thereby threatening the engineering safety.
At present, two different measurement methods, namely a contact method and a non-contact method, are mainly adopted in a common concrete expansion and contraction detection device. The common concrete expansion and contraction instrument based on the contact method comprises a horizontal type instrument and a vertical type instrument. The horizontal concrete expansion and contraction instrument mainly comprises a base, and a positioning upright post, an adjustable upright post, a standard rod and a dial indicator which are fixed on the base. When the testing is carried out, firstly, a standard rod is used for carrying out zero setting of the dial indicator, then, the embedded part measuring head at one end of the concrete test piece is abutted against the groove of the positioning upright post, and the embedded part measuring head at the other end of the test piece is abutted against the measuring head of the dial indicator. And then reflecting the length variation of the concrete sample through the reading change of the dial indicator. When the device is used for measuring the expansion and contraction of the concrete, repeated tests are required to be carried out by workers for many times, and the average value is taken as a final test result. The vertical concrete expansion and contraction instrument mainly comprises a base, supporting legs, a standard rod and a dial indicator. The test method is approximately the same as that of a horizontal concrete expansion and contraction instrument. The difference lies in, need utilize pre-buried bolt to fix the device base with the test piece after accomplishing zero setting work on, later only need read the change of amesdial reading and can survey the expansion shrinkage of concrete.
The above-mentioned horizontal and vertical apparatuses have the following drawbacks: the horizontal concrete expansion and contraction instrument is used, a tester needs to manually place a test piece on the expansion and contraction device base, the central shaft of the concrete test piece central shaft dial gauge cannot be ensured to be in the same vertical plane, and the accuracy of a test result can be obviously influenced. In addition, when the testing method is used, a tester needs to perform repeated tests to obtain a stable value, small differences which are difficult to perceive exist among the tests, so that the relative positions of the concrete test piece and the base during the repeated tests are difficult to keep consistent with the positions during the previous tests, and the final test result can be influenced to a certain extent. Although the vertical concrete expansion and contraction instrument can avoid the problems and reduce accidental errors caused by artificial factors, the test result is more accurate, but the vertical concrete expansion and contraction instrument is greatly influenced by environmental factors, and cannot be used in severe environments such as high temperature, high humidity, low temperature and low pressure or in a dust environment. And the vertical concrete expansion and contraction instrument is extremely sensitive to vibration, and the use environment is relatively limited. No matter whether horizontal concrete expansion and contraction instrument or vertical concrete expansion and contraction instrument needs to use the embedded part for positioning, no matter the embedded part measuring head generates slight position change and dislocation in the concrete pouring and hardening process, or the embedded part and the concrete test piece joint surface generate looseness and slippage, the concrete expansion and contraction measuring work can be greatly influenced. The precision of the two testing devices depends on the precision of the dial indicator to a great extent, the two testing devices can be basically only carried out in the environment of room temperature (20 +/-2) DEG C and relative humidity (60 +/-5)% and the application scene is limited by the environment.
Disclosure of Invention
In order to solve the problems, the invention provides a contact method concrete expansion and contraction detection device and method based on laser ranging.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
one or more embodiments provide a contact method concrete expansion and contraction detection device based on laser ranging, which comprises a base, a laser ranging assembly, a driving mechanism and a correcting mechanism, wherein the laser ranging assembly, the driving mechanism and the correcting mechanism are arranged on the base; the driving mechanism and the laser ranging assembly are oppositely arranged on the base to form a placing space of the test piece, and the driving mechanism is used for clamping the test piece; the correcting mechanism is arranged along the setting direction of the test piece.
One or more embodiments provide a contact method concrete expansion and contraction detection method based on laser ranging, which comprises the following steps:
after starting, entering a correction mode, and controlling the sliding baffle to a set position A according to the reference obtained after correction;
placing the test piece into a placing space on the test device, controlling the motor to work to drive the push rod to act, pushing the baffle plate to move towards the laser emitting device until a pressure signal is obtained, and stopping the driving motor;
controlling a laser emitting device to emit laser, and calculating the distance according to the received reflected light;
calculating the average value of the distances as the length data of the test piece, returning the baffle to a set position, and if the baffle accurately reaches the position A, continuing to measure the test piece; otherwise, entering a correction mode for correction.
Compared with the prior art, the beneficial effect of this disclosure is:
this is disclosed through setting up actuating mechanism and laser rangefinder subassembly relatively on the base, forms the fixed space that the test piece was placed, can guarantee that the position of placing the test piece at every turn is the same, need not all proofread and correct the position at every turn, has reduced artificial error, simultaneously, has set up correction module, can calibrate before measuring at every turn, has further improved measuring accuracy.
Advantages of the present disclosure, as well as advantages of additional aspects, will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure.
Fig. 1 is a front view of a detection device of embodiment 1 of the present disclosure;
fig. 2 is a left side view of the detection apparatus of embodiment 1 of the present disclosure;
fig. 3 is a top view of a detection device of embodiment 1 of the present disclosure;
FIG. 4 is a sectional view taken along line 1-1 in a front view of the detecting unit according to embodiment 1 of the present disclosure;
FIG. 5 is a sectional view taken along line 2-2 in a front view of the detecting unit according to embodiment 1 of the present disclosure;
fig. 6 is a three-dimensional perspective view of a detection device according to embodiment 1 of the present disclosure;
wherein: 1. the device comprises a fixed seat, 2, a base, 3, a Teflon coating, 4, a sliding guide rail, 5, a correcting ruler, 6, a driving motor, 7, a push rod, 8, a baffle, 9, a pressure sensor, 10, a standard block, 11, a laser emitting device, 12, a laser reflecting device, 13, a display screen, 14, a key, 15, a usb interface, 16 and a power supply interface.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments in the present disclosure may be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.
Example 1
In one or more embodiments, as shown in fig. 1 to 6, the contact concrete expansion and contraction detection device based on laser ranging comprises a base 2, a laser ranging assembly, a driving mechanism and a correcting mechanism, wherein the laser ranging assembly, the driving mechanism and the correcting mechanism are arranged on the base 2; the driving mechanism and the laser ranging assembly are oppositely arranged on the base 2 to form a placing space of the test piece, and the driving mechanism is used for clamping the test piece; the correcting mechanism is arranged along the setting direction of the test piece.
This embodiment is through setting up actuating mechanism and laser rangefinder subassembly relatively on base 2, forms the fixed space that the test piece was placed, can guarantee that the position of placing the test piece at every turn is the same, need not all proofread and correct the position at every turn, has reduced artificial error, simultaneously, has set up correction module, can calibrate before measuring at every turn, has further improved measuring accuracy.
In some embodiments, the correcting mechanism includes a standard block 10 and a correcting rule 5 disposed in the test piece setting direction.
Optionally, the calibration ruler 5 is disposed on the side of the base 2.
In some embodiments, the laser ranging assembly includes a laser emitting device 11 and a laser reflecting device 12 between which a test piece or a standard block is disposed.
Optionally, the laser reflection device 12 is connected to an output end of the driving mechanism, and the distance between the laser emission device 11 and the laser reflection device 12 can be changed under the action of the driving mechanism.
The laser ranging assembly further comprises a fixed seat 1 and a baffle plate 8 which are arranged at intervals, wherein the fixed seat 1 is fixedly arranged on the base 2, and the baffle plate 8 is movably arranged on the base 2 and is connected with a driving mechanism; the fixing seat 1 is provided with a laser emitting device 11, the baffle 8 is provided with a laser reflecting device 12, and the laser reflecting device 12 is opposite to the laser reflecting device 11.
Specifically, the laser reflection device 12 may be a reflection prism.
In this embodiment, laser rangefinder can set up laser emitter and receiving arrangement, and this embodiment sets up to prism direct reflection, can reduce the weight of the baffle 8 that removes, improves the flexibility of test, reduces drive arrangement's power take off.
Optionally, the fixing base 1 and the baffle 8 may be set to have any structure with parallel planes opposite to each other, and may be a cube, a cuboid or a cylinder.
Optionally, the number of the laser emitting devices 11 is 4, and the number of the laser reflecting devices 12 is 4.
Optionally, the laser emission module has a full scale of 1000mm and a precision of 20 um. The resulting spot diameter may be 2 mm.
In this embodiment, set up a plurality of laser emission devices 11 and set up a plurality of laser reflection device 12 that correspond on baffle 8 on the corner of fixing base 1, can improve laser rangefinder's measurement accuracy.
In some embodiments, the baffle 8 is movably disposed on the base 2 and can be disposed through a rail, specifically, the base 2 is provided with a sliding guide rail 4, and the lower end surface of the baffle 8 is provided with a groove matched with the sliding guide rail 4. Lubricating oil is coated between the baffle 8 and the sliding guide rail 4.
Furthermore, the distance between the two sliding guide rails 4 is adapted to the width of the test piece to form a clamping groove for clamping the test piece, so that the test piece can be placed between the two guide rails.
The sliding guide rail 4 can be used as a positioning groove, so that the section of a test piece can be parallel to the plane of the baffle and the right side surface of the fixing seat 1 in the laser ranging assembly, the axial line of the test piece is ensured to be coincident with the central axis of the baffle 8 and the central axis of the push rod 7, and the measurement error caused by human factors is reduced. And the preparation of the measuring head of the embedded part is omitted, the measuring error possibly introduced by the measuring head is removed, and the preparation flow of the test piece is simplified.
Further, still be equipped with pressure sensor 9 on the baffle 8 for whether the perception test piece is closely laminated with baffle 8.
Specifically, the sliding guide rail 4 may be a prismatic surface guide rail, the cross-sectional shape of the guide rail is rectangular, and the sliding guide rail is located between the laser distance measuring device and the motor and also serves as a positioning groove.
In some embodiments, the driving mechanism comprises a driving motor 6 and a push rod 7, the push rod is connected with a baffle plate 8 of the laser ranging assembly, and a power output end of the driving motor 6 is connected with the push rod 7.
When the device is used, the motor 6 drives the push rod 7 to stretch and push the baffle 8 to move on the sliding guide rail 4, so that the distance between the laser emitting device 11 and the laser reflecting device 12 is changed.
Further technical scheme, the up end of base 2 can also scribble Teflon coating 3, can reduce the frictional force between test piece and the base to reduce the error that consequently brings.
Optionally, one side of the standard block 10 abuts against the laser ranging assembly, and the other side abuts against the sliding baffle, and the size of the standard block may be a cuboid of 100mm × 520 mm. The correcting ruler 5 is arranged on the front surface of the base 2 and is used for roughly determining the position of the baffle 8 and ensuring that the baffle 8 is vertical. The base 2 may be provided as a tray structure.
In other embodiments, a main controller may be provided, and the main controller is electrically connected with the motor 6 and the pressure sensor 9.
Furthermore, an operating device and a display device can be further arranged, and the operating device and the display device are respectively and electrically connected with the main controller.
The display device may be a display screen 13. And the laser distance measuring module is used for displaying the measured length of the laser distance measuring module. The operating device may be a key 14, and five keys 14 of confirmation, cancellation, stop, previous item and next item may be respectively arranged below the display screen to control the display data.
Optionally, a data transmission interface may also be provided.
Specifically, the data transmission interface may be set as the usb interface 15.
The power supply of the device may be a charging power source, which is connected to an external power source via the power interface 16 for charging.
The working method of the device comprises the following steps:
after the device is started, the device automatically enters a correction mode, and the sliding baffle 8 retracts to a set distance, such as about 600mm, away from the correction ruler 5. The tester slowly places the standard block (with the length of 520mm) on the bottom tray along the sliding guide rail 4, so that the standard block contacts with the right side surface of the fixed seat 1. And then clicking a start button, pushing the baffle plate 8 to move along the sliding guide rail 4 by the telescopic push rod 7, and automatically calibrating the device after the pressure sensor 9 on the baffle plate 8 receives set pressure, and setting the measured distance as a standard distance. Then the device automatically enters a measuring mode, and the sliding baffle plate retracts to 600 mm. The tester corrects at this moment, if find that slide damper and alignment gauge 600mm scale are different greatly, need to correct again. And then placing the test piece on the bottom tray by the same method, testing, exporting data after the test is finished, disconnecting the power supply, and finishing the test.
This embodiment adopts laser rangefinder to carry out the detection of concrete sample length, and the original length of concrete sample can be accurate measure, simultaneously owing to adopt the test method that four laser rangefinder results took the average value, the measuring accuracy has improved 20um, has guaranteed the accuracy of experiment to can use in various environment, receive the restriction degree of environment less.
Example 2
Based on the detection device of embodiment 1, this embodiment provides a contact method concrete expansion and contraction detection method based on laser ranging, which includes the following steps:
In step 1, the position a may be a set distance from the laser emitting device 11, for example, the distance may be 600mm
Specifically, the device is started, and the operator first plugs the power line into the power interface 16 and turns on the power supply of the device. After the device is started, the device automatically enters a correction mode, the sliding baffle 8 retracts to about 600mm, and the device is started.
The correction mode control method comprises the following specific processes:
and 14, setting the average distance value as the length of the standard block, taking the position corresponding to the length as a reference, moving the baffle to a set position B according to the position relation between the standard block and the set position A, finishing correction if the position A and the position B are superposed, and otherwise, adjusting the device.
In this embodiment, the length of the standard block is constant, for example, 520mm may be set, if the detected distance is accurate, the set position a may be reached finally, if the detection is inaccurate, the position a may be deviated finally, at this time, the device needs to be adjusted, if the laser ranging device may be replaced, it may be determined whether the current device is accurate in measurement through correction.
The specific correction process is as follows: the device calibration work is to place one end of the standard block 10 on the base 2 slowly along the sliding guide rail 4, and the left side of the standard block 10 is abutted to the right side face of the fixed seat 1. The staff clicks and begins first, and motor 6 drive telescopic push rod 7 promotes baffle 8 and moves left along sliding guide 4, and motor 6 cuts off the power supply automatically after pressure sensor 9 feels pressure, and laser rangefinder launches the laser, calculates the distance after reflection prism 12 reflects, and the average value that will take four laser emission device calculation results of final device is as standard distance to set up it as standard block 10 original length 520 mm. After the setting is finished, the motor 6 is automatically started, the telescopic push rod 7 is driven to pull the sliding baffle 8 to move rightwards along the sliding guide rail 4 and retreat to the position 600mm away from the scale of the correcting ruler 5, the device automatically enters a measuring mode, a worker takes down the standard block 10, and the calibration work is finished.
In this embodiment, the test piece test work, the test piece placement and the measurement procedure are substantially the same as the device calibration work. The staff clicks earlier and begins, and motor 6 drive telescopic push rod 7 promotes slide damper 8 and moves along sliding guide 8 leftwards, waits that pressure sensor 9 to feel pressure back motor 6 auto-power-off, and laser rangefinder launches laser, calculates the distance after reflection prism reflection, and the device can record four laser emission module 11 measured length data to the average length data of automatic calculation is as final test result. Similarly, after the single measurement is finished, the sliding baffle automatically retracts to the position 600mm of the calibration scale 5. At this moment, the worker needs to observe whether the sliding baffle plate retreats to the position 600mm away from the 5-scale of the correcting ruler. If not, the device start-up work and calibration work need to be performed again. In the test work stage of the test piece, a plurality of test pieces can be tested continuously, and the device can record the measurement results and the final test results of different laser emission modules 11 according to the test sequence. And finishing the test work of the test piece.
And (3) data exporting, wherein a worker inserts the USB flash disk into the usb interface 15, then simultaneously presses the start button and the stop button, the data txt file is automatically exported to the USB flash disk, after waiting for about 10s, the USB flash disk is pulled out, and the data exporting is completed.
And (5) closing the device, wherein the worker pulls out the power line, the device is automatically closed, and the closing of the device is finished.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. Contact method concrete expansion and contraction detection device based on laser rangefinder, characterized by: the device comprises a base, a laser ranging assembly, a driving mechanism and a correcting mechanism, wherein the laser ranging assembly, the driving mechanism and the correcting mechanism are arranged on the base; the driving mechanism and the laser ranging assembly are oppositely arranged on the base to form a placing space of the test piece, and the driving mechanism is used for clamping the test piece; the correcting mechanism is arranged along the setting direction of the test piece.
2. The contact method concrete expansion and contraction detection device based on laser ranging as claimed in claim 1, wherein: the correcting mechanism comprises a standard block and a correcting ruler arranged along the setting direction of the test piece.
3. The contact method concrete expansion and contraction detection device based on laser ranging as claimed in claim 1, wherein: the laser ranging assembly comprises a laser emitting device and a laser reflecting device, a test piece or a standard block is arranged between the laser emitting device and the laser reflecting device, and the laser reflecting device is connected with the output end of the driving mechanism.
4. The contact method concrete expansion and contraction detection device based on laser ranging as claimed in claim 3, wherein: the laser ranging assembly further comprises a fixed seat and a baffle plate which are oppositely arranged at intervals, the fixed seat is fixedly arranged on the base, and the baffle plate is movably arranged on the base and connected with the driving mechanism; the fixing seat is provided with a laser emitting device, the baffle is provided with a laser reflecting device, and the laser reflecting device is opposite to the laser reflecting device.
5. The contact method concrete expansion and contraction detection device based on laser ranging as claimed in claim 4, wherein: the laser reflection device is a reflection prism;
or the laser emitting devices are arranged at the corners of the fixed seat and are one or more, and the laser reflecting devices are arranged corresponding to the laser emitting devices;
or the baffle plate can be movably arranged on the base through a track, the base is provided with a sliding guide rail, and the lower end surface of the baffle plate is provided with a groove matched with the sliding guide rail;
or the distance between the two sliding guide rails is adaptive to the width of the test piece.
6. The contact method concrete expansion and contraction detection device based on laser ranging as claimed in claim 4, wherein: still be equipped with pressure sensor on the baffle for whether the perception test piece laminates with the baffle.
7. The contact method concrete expansion and contraction detection device based on laser ranging as claimed in claim 6, wherein: the pressure sensor is also provided with a main controller which is electrically connected with the pressure sensor;
or the operating device and the display device are respectively electrically connected with the main controller;
or, a data transmission interface is also arranged and electrically connected with the main controller.
8. The contact method concrete expansion and contraction detection device based on laser ranging as claimed in claim 4, wherein: the driving mechanism comprises a driving motor and a push rod, the push rod is connected with a baffle of the laser ranging assembly, and the power output end of the driving motor is connected with the push rod;
or the upper end surface of the base is also coated with a Teflon coating.
9. The contact method concrete expansion and shrinkage detection method based on laser ranging is characterized by comprising the following steps of:
after starting, entering a correction mode, and controlling the sliding baffle to a set position A according to the reference obtained after correction;
placing the test piece into a placing space on the test device, controlling the motor to work to drive the push rod to act, pushing the baffle plate to move towards the laser emitting device until a pressure signal is obtained, and stopping the driving motor;
controlling a laser emitting device to emit laser, and calculating the distance according to the received reflected light;
calculating the average value of the distances as the length data of the test piece, returning the baffle to a set position, and if the baffle accurately reaches the position A, continuing to measure the test piece; otherwise, entering a correction mode for correction.
10. The contact method concrete expansion and contraction detection method based on laser ranging as claimed in claim 9, wherein: the correction mode control method comprises the following specific processes:
when a correction starting signal is obtained, the driving motor works to drive the push rod to act, the baffle is pushed to move towards the laser emitting device, and the driving motor stops until a pressure signal is obtained;
controlling a laser emitting device to emit laser, and calculating the distance according to the received reflected light;
calculating the average value of the distances;
and setting the distance average value as the length of the standard block, taking the position corresponding to the length of the set standard block as a reference, moving the baffle to a set position B according to the position relation between the standard block and the set position A, finishing the correction if the position A and the position B are superposed, and otherwise, adjusting the device.
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| CN117110590A (en) * | 2023-08-31 | 2023-11-24 | 力姆泰克（北京）传动设备股份有限公司 | Multi-degree-of-freedom testing device and method |
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