CN107664599B - Method and device for judging tensile fracture of asphalt - Google Patents
Method and device for judging tensile fracture of asphalt Download PDFInfo
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- CN107664599B CN107664599B CN201710530800.8A CN201710530800A CN107664599B CN 107664599 B CN107664599 B CN 107664599B CN 201710530800 A CN201710530800 A CN 201710530800A CN 107664599 B CN107664599 B CN 107664599B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000003825 pressing Methods 0.000 claims abstract description 16
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- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 9
- 238000000691 measurement method Methods 0.000 description 4
- 238000011179 visual inspection Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
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- 230000000977 initiatory effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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Abstract
The patent provides a method and a device for judging asphalt tensile fracture. The device comprises a laser ranging module, an auxiliary connecting piece, a structured light measuring module, a rotating table bracket, a host, an external button, a moving table, a fixed table, a water tank, a recording button and a controller; the external button comprises an external button shell, an external button motor and an external button pressing piece; the external button motor is connected with the external button pressing piece, and the external button pressing piece is connected with the recording button; the recording button and the external button pressing piece are connected with the controller. This patent has realized the real-time judgement of pitch fracture in the pitch stretching process, can be applied to and not limited to various pitch ductility test device. This patent has realized automatic pitch fracture judgement, can avoid having reduced test cost owing to the error that manual monitoring brought, has improved work efficiency. The non-contact fracture judgment method adopted by the method improves the judgment accuracy of the original tension sensor method and improves the response speed.
Description
Technical Field
This patent belongs to pitch ductility test field.
Background
Technical terminology
Asphalt ductility: also called asphalt ductility value, the length in centimeters (cm) of an asphalt sample of a predetermined form when stretched at a predetermined temperature and at a predetermined speed to break.
Asphalt ductility instrument: the asphalt ductility tester is also called an asphalt ductility tester and a low-temperature asphalt ductility tester, and is suitable for measuring asphalt ductility and also suitable for testing elastic recovery tests of modified asphalt.
Asphalt sample: asphalt samples for asphalt ductility experiments.
Impact signal: the impact signal is a signal with short acting time and larger acting value, and is represented in the patent, and the signal with the amplitude of more than 20mm at a certain moment in the output distance information being larger than that at the adjacent moment (+ -1 s) when the structural light measuring module measures.
Asphalt ductility is an important indicator for evaluating asphalt plasticity and low temperature performance of asphalt. The ductility value of asphalt has a great influence on the performance of asphalt mixtures. In the use process of the asphalt pavement, when the ductility of asphalt is attenuated to a certain value, the low-temperature deformability required by the pavement cannot be met, and diseases are easy to occur under the action of loads and the like. Studies have shown that pavement cracking readily occurs when the ductility of asphalt at 15 ℃ is reduced to about 5 cm.
The asphalt ductility tester is a special instrument for measuring asphalt ductility and elastic recovery deformation capacity, and consists of a ductility tester controller, a test die and a bottom plate. Asphalt ductility was measured according to the measurement methods prescribed in national standards "asphalt ductility measurement method (GB/T4508-2010) and" Highway base and pavement on-site test procedure (JTGE 60-2008).
The asphalt ductility instrument consists of a stretching device (comprising a movable table and a fixed table), a controller (comprising a value indicating system, a water tank temperature control device, a speed control device and a recording button) and a water tank; the test mold consists of 2 arc end molds and 2 side molds, and is divided into an 8-shaped test mold and a straight line test mold according to purposes. The working principle is as follows: and (3) injecting a melted asphalt material sample into a test mold, cooling and forming, curing for a certain time at a certain test temperature, loading the test mold onto a test mold fixing plate (column) of a ductility tester, driving a moving table to move forward at a certain speed by a motor until the test piece stretches to fracture, and recording the stretching length at the moment, wherein the stretching speed is regulated by controlling the motor, the test temperature is controlled by a constant temperature device, and the stretching length is displayed as an indication value of the ductility tester by a pointer scale or a digital form. Asphalt ductility depends on the properties of the asphalt itself, and is related to factors such as test temperature, drawing speed, bath warm-up time, and bath density.
Implementation scheme of the prior art
1) Visual inspection method
The current method for judging asphalt fracture on an asphalt ductility meter is mainly a visual inspection method. Namely, the process of stretching asphalt in the asphalt ductility instrument is observed through human eyes, and when the asphalt is observed to be broken, a recording button is pressed down to record the current asphalt ductility value.
2) Tension sensor assay
When the asphalt ductility machine stretches, asphalt stretching force is transmitted to the tension sensor through a test die, the tension sensor can output a tension value after being stretched, and asphalt breakage is judged when the tension value is 0.
The prior art has the following disadvantages:
1) The accuracy of judging breakage is low. Because the measurement accuracy of the tension sensor is limited, the measurement accuracy of the asphalt ductility meter with the tension sensor is only 0.1N at present, and when asphalt is stretched to a certain length, the diameter of the finest part of the asphalt is about 0.5mm, and the tensile force of the asphalt is far less than 0.01N at the moment, and misjudgment can be generated when the tension sensor is used for measuring the tensile force. If the tensile force of the asphalt is 0.08N when the asphalt is stretched to a certain length but not broken, the asphalt is judged to be in a broken state when the asphalt is not broken in the tensioning process. Similarly, if the current commonly used visual inspection method is used for fracture judgment, the human eyes cannot accurately identify the fracture due to the small pitch fracture distance at the moment of pitch fracture, so that the occurrence of fracture cannot be timely judged. The relevant criteria in our country indicate that the value of the selection response for an adult aged 20-39 years (i.e. presenting a stimulus for the time interval from when the test sees or hears the stimulus to when it reacts immediately) is of the excellent grade, 0.39 seconds. The relevant standard prescribes that the stretching speed of the asphalt ductility machine is generally 50mm/min when in operation, and the error caused by manual operation of the common experimenter is far more than 0.325mm.
2) The existing automatic fracture judgment technology depends on factory preassembly of an asphalt ductility meter. In the prior art, a tension sensor is required to be installed during instrument production to realize fracture judgment, and old equipment cannot be upgraded and modified.
Disclosure of Invention
The invention realizes the automatic judgment of asphalt fracture in the asphalt stretching process, realizes the timely and accurate judgment of asphalt stretching fracture, realizes the upgrading and reconstruction of old equipment, and can be suitable for most asphalt ductility apparatuses.
The device for the method mainly comprises a laser ranging module, an auxiliary connecting piece, a structured light measuring module, a rotating table bracket, a host machine, an external button and the like, wherein a hardware connection diagram is shown in the accompanying drawing
Shown in fig. 2.
1. A device for pitch tensile fracture judges, its characterized in that: the device comprises a laser ranging module, an auxiliary connecting piece, a structured light measuring module, a rotating table bracket, a host, an external button, a moving table, a fixed table, a water tank, a recording button and a controller; the external button comprises an external button shell, an external button motor and an external button pressing piece. The external button motor is connected with the external button pressing piece, and the external button pressing piece is connected with the recording button. The recording button and the external button pressing piece are connected with the controller;
the structured light measurement module includes a structured light emitting portion and a structured light receiving portion. The host computer is connected with the laser ranging module, the host computer is connected with the structured light measuring module, the host computer is connected with the rotating table, and the host computer is connected with the external button.
The laser ranging module is arranged on the movable table through an auxiliary connecting piece and is opposite to the fixed table, the structured light measuring module is arranged on the rotating table, and the rotating table is connected with the host through a rotating table bracket; the host is arranged on the fixed table; the rotating table can drive the structured light measuring module to rotate,
the host adopts a computer or a microcomputer;
the laser ranging module is realized by a laser ranging sensor.
The structure light emitting part adopts a laser as a light source, and a cylindrical lens group is arranged in front of the light source to adjust light beams so as to realize structure light output; a structured light receiving section employing a two-dimensional digital sensor or a camera;
the host computer can adopt a computer or a microcomputer, and is used for realizing data storage, rotation control, button pressing control and the like.
The structured light measuring module is mainly composed of a structured light emitting portion, a structured light receiving portion, and the like, as shown in fig. 3.
Wherein 3-1 is a structural light emitting part, which can adopt a light source such as a semiconductor laser, and the like, and a cylindrical mirror group is arranged in front of the light source to adjust light beams so as to realize structural light output; 3-2 is a structured light receiving section, which may be a two-dimensional digital sensor or a camera; 3-3 is structured light; 9 is a stretched asphalt sample; 8-6 is the bottom surface of the water tank.
The laser ranging module can be realized by a laser ranging sensor.
The host computer is connected with the laser ranging module, the host computer is connected with the structured light measuring module, the host computer is connected with the rotating table, and the host computer is connected with the external button.
The laser ranging module is arranged on the mobile station and is opposite to the fixed station, so that the distance between the laser ranging module and the fixed station opposite to one side of the laser ranging module can be measured.
The rotating table can drive the structured light measuring module to rotate, and the rotating table drives the structured light measuring module to rotate in a clockwise direction and a counterclockwise direction when the device is observed from the side surface (shown in fig. 1).
When the asphalt ductility apparatus is in operation, a predetermined amount of water is injected into the water tank, the asphalt sample is placed between the fixed stage and the movable stage, and the movable stage moves at a constant rate to stretch the asphalt sample.
The flow chart of the technical scheme of the method is shown in fig. 3.
Fig. 4 a is a schematic diagram of initial state information in the water tank obtained by pre-scanning, and b is a schematic diagram of working state information in the water tank. The schematic diagram is only a part of data measured by the structured light measuring module, reflects the change condition of the measured data of the position where the stretched asphalt exists, and the slope of a line segment and the type of the line segment in the diagram cannot completely contain all possible data change curves, and is only the schematic diagram. In the figure, t is time, and d is distance information measured by the structured light measuring module.
Impact signal: the impact signal is a signal with short acting time and larger acting value, and is represented in the patent, and the signal with the amplitude of more than 20mm at a certain moment in the output distance information being larger than that at the adjacent moment (+ -1 s) when the structural light measuring module measures.
The overall technical scheme of the measuring method is realized as follows:
(1) As illustrated in the accompanying drawings
(2) FIG. 2 shows a laser ranging module mounted on a mobile station, a structured light measuring module mounted on a fixed station, and an auxiliary connector adjusted to enable the initial position of the structured light measuring module to face the edge of the fixed station, so that the light emitted by the laser ranging module can vertically hit the side of the fixed station facing the laser ranging module.
(3) Initiating a pre-scan of the device described in this patent: under the condition that an asphalt sample is not placed, the laser ranging module continuously measures the distance value between the mobile station and the fixed station and transmits the distance value to the host computer, the host computer automatically calculates the angle range of the rotating table which needs to rotate according to the distance data measured by the laser ranging module, and the rotating table is controlled to drive the structured light measuring module to rotate, so that light emitted by the structured light measuring module can sweep all areas between the mobile station and the fixed station. The structured light measuring module transmits the measured data to the host computer, and the host computer calculates according to the distance data of the laser ranging module and the measured data of the structured light measuring module to obtain the initial state information in the water tank. Thus completing one pre-scan.
(4) After the pre-scanning is completed, the mobile station is restored to the initial position, and the data recorded by the controller are cleared.
(5) The external button is connected to the recording button, so that the controller can record the asphalt ductility value at the time when the external button works.
(6) The device provided by the patent is restored to an initial state by the structured light measuring module, the laser ranging module and the rotating table.
(7) Asphalt samples were mounted on the mobile and stationary stations.
(8) The scanning function of the device described in this patent is activated. Under the condition that an asphalt sample is placed, the laser ranging module continuously measures the distance value between the mobile station and the fixed station and transmits the distance value to the host computer, the host computer automatically calculates the angle range of the rotating table which needs to rotate according to the distance data measured by the laser ranging module, and the rotating table is controlled to drive the structured light measuring module to rotate, so that light emitted by the structured light measuring module can sweep all areas between the mobile station and the fixed station. As shown in fig. 1, the structured light emitted from the structured light measuring module is irradiated onto the bottom surface of the water tank and the asphalt sample, and the structured light is reflected back and received by the structured light receiving portion. The structured light measuring module transmits the measured data to the host computer, and the host computer calculates according to the distance data of the laser ranging module and the measured data of the structured light measuring module to obtain the initial state information in the water tank. Thus completing one scan.
(9) When the mobile station slowly moves, the laser ranging module continuously measures and obtains displacement data and transmits the displacement data to the host computer, the host computer controls the rotating table to rotate according to the displacement data, and the rotating table drives the structured light measuring module to rotate, so that the structured light measuring module can sweep all areas between the fixed table and the mobile station, namely, all areas where asphalt is stretched. The structured light measuring module continuously scans in a reciprocating manner, so that the tensile state of asphalt is accurately monitored.
(10) As shown in fig. 3, the host computer judges according to the working state information in the water tank output by the structured light measurement module, and if an impact signal appears in the working state information relative to the initial state information, the host computer can be regarded as detecting asphalt fracture, triggers the external button to press, and controls the controller to record the asphalt ductility value.
(11) If the asphalt is not broken, scanning is continued.
Drawings
FIG. 1 is a schematic diagram of hardware connections for a device
In the figure, 1 is a laser ranging module, 2 is an auxiliary connecting piece, 3 is a structured light measuring module, 4 is a rotating table, 5 is a rotating table support, 6 is a host, and an external button consists of 7-1, 7-2 and 7-3, wherein 7-1 is an external button shell, 7-2 is an external button motor, and 7-3 is an external button pressing piece. 8-1 is a mobile station, 8-2 is a fixed station, 8-3 is a water tank, 8-4 is a recording button, and 8-5 is a controller. 8-1, 8-2, 8-3, 8-4, 8-5 are part of the components of the asphalt ductility apparatus.
FIG. 2 is a schematic diagram of a structured light measurement module
FIG. 3 is a flow chart of the technical scheme
FIG. 4 is a schematic diagram of fracture judgment
Technical solution flowchart of the embodiment of FIG. 5
Detailed Description
This patent can be used to monitor the fracture of pitch in the pitch stretching process to the pitch ductility of control controller record fracture moment, its flow chart is as in fig. 5:
(1) As illustrated in the accompanying drawings
(2) FIG. 2 shows a laser ranging module mounted on a mobile station, a structured light measuring module mounted on a fixed station, and an auxiliary connector adjusted to enable the initial position of the structured light measuring module to face the edge of the fixed station, so that the light emitted by the laser ranging module can vertically hit the side of the fixed station facing the laser ranging module.
(3) Initiating a pre-scan of the device described in this patent: under the condition that an asphalt sample is not placed, the laser ranging module continuously measures the distance value between the mobile station and the fixed station and transmits the distance value to the host computer, the host computer automatically calculates the angle range of the rotating table which needs to rotate according to the distance data measured by the laser ranging module, and the rotating table is controlled to drive the structured light measuring module to rotate, so that light emitted by the structured light measuring module can sweep all areas between the mobile station and the fixed station. The structured light measuring module transmits the measured data to the host computer, and the host computer calculates according to the distance data of the laser ranging module and the measured data of the structured light measuring module to obtain the initial state information in the water tank. Thus completing one pre-scan.
(4) After the pre-scanning is completed, the mobile station is restored to the initial position, and the data recorded by the controller are cleared.
(5) Install external button to the record button for external button push piece can press the record button when moving down, makes the controller note the asphalt ductility value at that time. The device provided by the patent is restored to an initial state by the structured light measuring module, the laser ranging module and the rotating table.
(6) Asphalt samples were mounted on the mobile and stationary stations.
(7) The device scanning function is started. The scanning function of the device described in this patent is activated. Under the condition that an asphalt sample is placed, the laser ranging module continuously measures the distance value between the mobile station and the fixed station and transmits the distance value to the host computer, the host computer automatically calculates the angle range of the rotating table which needs to rotate according to the distance data measured by the laser ranging module, and the rotating table is controlled to drive the structured light measuring module to rotate, so that light emitted by the structured light measuring module can sweep all areas between the mobile station and the fixed station. The structured light emitted by the structured light measuring module irradiates the bottom surface of the water tank and the asphalt sample, and the structured light is reflected back and received by the structured light receiving part. The structured light measuring module transmits the measured data to the host computer, and the host computer calculates according to the distance data of the laser ranging module and the measured data of the structured light measuring module to obtain the initial state information in the water tank. Thus completing one scan.
(8) When the mobile station moves, the laser ranging module continuously measures and obtains displacement data and transmits the displacement data to the host computer, the host computer controls the rotating table to rotate according to the displacement data, and the rotating table drives the structured light measuring module to rotate, so that the structured light measuring module can sweep all areas between the fixed table and the mobile station, namely, all areas where asphalt is stretched. The structured light measuring module continuously scans in a reciprocating manner, so that the tensile state of asphalt is accurately monitored.
(9) As shown in fig. 5, the host machine determines according to the working state information in the water tank output by the structured light measurement module, if the working state information is found to be an impact signal relative to the initial state information, the host machine can be regarded as finding an asphalt fracture signal, otherwise, the host machine continues to monitor.
(10) If the asphalt is detected to be broken, the host controls the external button motor to rotate.
(11) The external button motor drives the external button pressing piece to move downwards when rotating, and the external button pressing piece is pressed to the recording button after moving downwards for a certain distance.
(12) The controller records the then-current asphalt ductility value.
This patent has realized the real-time judgement of pitch fracture in the pitch stretching process.
The asphalt ductility test fixture has excellent applicability and can be applied to and is not limited to various asphalt ductility test devices.
This patent has realized automatic pitch fracture judgement, can avoid because the error that manual monitoring brought.
The cost of artifical participation experiment has been saved to this patent, has reduced test cost, has improved work efficiency.
The non-contact fracture judgment method adopted by the method improves the judgment accuracy of the original tension sensor method and improves the response speed.
The device can be applied to upgrading and reconstruction of old equipment, is convenient to install, and does not need to return the equipment to a manufacturer for reconstruction.
This patent has realized the judgement of pitch tensile fracture.
At present, no effective asphalt tensile fracture automatic judging method for an asphalt ductility instrument exists. The tension sensor has limited precision in detecting tension, the response minimum tension is 0.1N, and according to experimental research, the tension is 0 after asphalt is stretched to a certain length, but asphalt is not broken.
Because the water tank needs to be filled with water when the extensometer works, refraction generated by light rays of the structured light propagating in the water area can influence the measurement result. In order to avoid the influence of refraction, this patent carries out the prescan to the basin of not installing the pitch sample at first, has obtained the inside initial state information of basin, detects the interior operating condition information of basin of installing the pitch sample again.
The information amplitude obtained by the structured light measuring module is higher than the amplitude of the non-installed asphalt sample, which can be obtained in the scanning state of the installed asphalt test. When asphalt breaks, the working state information generates an impact signal. The impact signal is generated as follows: when the asphalt is not broken, the structured light measurement module can scan to obtain a continuous smooth curve which is generated because the elongated asphalt formed by stretching obstructs the transmission of structured light in the water tank. When the asphalt is broken, a gap is cut off in the middle of the elongated asphalt formed by stretching, and the structured light can irradiate to the bottom of the water tank through the gap, so that the structured light measuring module can scan to obtain a continuous curve, and an impact signal exists on the curve. According to domestic relevant standard requirements, when the asphalt ductility meter works, the distance between asphalt and the bottom of the water tank is not less than 250mm, and the distance between asphalt and the water surface is not less than 250mm, so that the amplitude of the impact signal is about 250mm greater than that of a curve near the impact signal. Therefore, the distance measurement resolution of the structured light measurement module is only lower than 250mm, and the cost of the patent is reduced.
The fracture condition of the asphalt sample can be judged according to the generation and the amplitude of the impact signal. Because the structured light measurement module monitors the asphalt status in a scanning manner, the patent can detect once the asphalt is subjected to fine fracture separation.
According to domestic test specifications and the sizes of the existing product models, asphalt is broken when the tensile distance of the asphalt ductility meter in working is 1000mm, at the moment, the rotating table drives the structured light measuring module to rotate in a rotating range, the structured light measuring module can reciprocally rotate for not less than 5 times within 1 second, and namely, the whole working process measurement can be completed every 0.1 second. The measuring frequency of the structured light measuring module can reach more than 50kHz, namely 50000 times per second, so that the minimum unit of the asphalt stretched to be 1000mm long, which is scanned by the structured light measuring module, is 1000 mm/50000/10=0.2 mm, and the minimum unit of the asphalt stretched to be 1000mm long, which is scanned by the structured light measuring module, only needs 0.00002 s. Obviously, in the optimal condition, the device can judge that the asphalt breaks after the asphalt breaks for 0.00002 s.
The measurement model of the ductility value of the asphalt ductility meter is delta D=D i -D 0 Which is provided withMiddle DeltaD i D for judging the indication error of the ductility value recorded when the fracture occurs i To determine the measured value of ductility recorded at break, D 0 To judge the standard value of the ductility recorded at the time of fracture. Each influence factor of the measurement model is independent, and the synthetic variance is obtained as follows:and C 1 ＝1，C 2 = -1. Through repeated experiments and combined with relevant literature in China, the maximum allowable error of fracture judgment by using human eyes is found>0.325mm; u (D) of asphalt ductility apparatus 0 ) =0.1 mm. Visual inspection is carried out to determine that the synthetic standard uncertainty of the asphalt ductility value when asphalt breaks is +.>Taking k=2, the spread uncertainty of the measurement result is 0.68mm.
Adopt this patent to carry out the fracture judgement in the pitch stretching process, its model is the same above. Maximum allowable error u (D) 0 ) 0.2mm, the uncertainty of the synthesis standard isTaking k=2, the extended uncertainty of the measurement results using this patent is 0.44mm.
When the device is used for measuring the ductility value in the stretching process of the asphalt ductility meter, the expansion uncertainty of the measurement result is 0.65 of the expansion uncertainty of the visual measurement method, and obviously, the performance of the device is far better than that of the visual measurement method.
This patent can work with original asphalt ductility appearance cooperation. The installation of this patent does not involve the direct transformation to original pitch ductility appearance, can very convenient install on pitch ductility appearance. The external button of this patent design can be applicable to the outside push button of most instruments, triggers original device and carries out corresponding operation after realizing that external device measures the result.
Claims (5)
1. A device for pitch tensile fracture judges, its characterized in that: the device comprises a laser ranging module, an auxiliary connecting piece, a structured light measuring module, a rotating table bracket, a host, an external button, a moving table, a fixed table, a water tank, a recording button and a controller; the external button comprises an external button shell, an external button motor and an external button pressing piece; the external button motor is connected with the external button pressing piece, and the external button pressing piece is connected with the recording button; the recording button and the external button pressing piece are connected with the controller;
the structured light measuring module includes a structured light emitting portion and a structured light receiving portion; the host is connected with the laser ranging module, the host is connected with the structured light measuring module, the host is connected with the rotating table, and the host is connected with the external button;
the laser ranging module is arranged on the movable table through an auxiliary connecting piece and is opposite to the fixed table, the structured light measuring module is arranged on the rotating table, and the rotating table is connected with the host through a rotating table bracket; the host is arranged on the fixed table; the rotating table can drive the structured light measuring module to rotate.
2. The apparatus of claim 1, wherein the host computer is a computer or a microcomputer.
3. The apparatus of claim 1, wherein the laser ranging module is implemented with a laser ranging sensor.
4. The apparatus of claim 1, wherein the structured light emitting section employs a laser as a light source, and a cylindrical mirror group is installed in front of the light source to perform beam adjustment, thereby realizing structured light output; and the structure light receiving part adopts a two-dimensional digital sensor or a camera.
5. The method for applying the device of claim 1, wherein the implementation process is as follows:
(1) The method comprises the steps that a laser ranging module is installed on a mobile station, a structural light measuring module is installed on a fixed station, the structural light measuring module is adjusted to enable the initial position of the structural light measuring module to be opposite to the edge of the fixed station, and an auxiliary connecting piece is adjusted to enable light emitted by the laser ranging module to vertically strike the front side of the fixed station opposite to the laser ranging module;
(2) Starting pre-scanning: under the condition that an asphalt sample is not placed, the laser ranging module continuously measures the distance value between the mobile station and the fixed station and transmits the distance value to the host, the host automatically calculates the angle range of the rotating station to be rotated according to the distance data measured by the laser ranging module, and the rotating station is controlled to drive the structured light measuring module to rotate, so that light emitted by the structured light measuring module can sweep all areas between the mobile station and the fixed station; the structured light measuring module transmits the measured data to the host computer, and the host computer calculates according to the distance data of the laser ranging module and the measured data of the structured light measuring module to obtain initial state information in the water tank; thus completing one pre-scanning;
(3) After the pre-scanning is completed, the mobile station is restored to the initial position, and the data recorded by the controller are cleared;
(4) The external button is connected to the recording button, so that the controller can record the asphalt ductility value at the time when the external button works;
(5) Restoring the initial state of the structured light measuring module, the laser ranging module and the rotating table;
(6) Placing the asphalt sample between a fixed table and a movable table, wherein the movable table moves at a constant speed, and stretching the asphalt sample;
(7) Starting scanning; under the condition that an asphalt sample is placed, the laser ranging module continuously measures the distance value between the mobile station and the fixed station and transmits the distance value to the host, the host automatically calculates the angle range of the rotating station to be rotated according to the distance data measured by the laser ranging module, and the rotating station is controlled to drive the structured light measuring module to rotate, so that light emitted by the structured light measuring module can sweep all areas between the mobile station and the fixed station; the structured light emitted by the structured light measuring module irradiates the bottom surface of the water tank and the asphalt sample, and the structured light is reflected back and received by the structured light receiving part; the structured light measuring module transmits the measured data to the host computer, and the host computer calculates according to the distance data of the laser ranging module and the measured data of the structured light measuring module to obtain initial state information in the water tank; thus completing one scanning;
(8) When the mobile station moves, the laser ranging module continuously measures to obtain displacement data and transmits the displacement data to the host, the host controls the rotating table to rotate according to the displacement data, and the rotating table drives the structured light measuring module to rotate, so that the structured light measuring module can sweep all areas between the fixed table and the mobile station, namely all areas where asphalt is stretched; the structure light measuring module continuously scans in a reciprocating manner to ensure that the tensile state of asphalt is accurately monitored;
(9) The host judges according to the working state information in the water tank output by the structured light measuring module, if the working state information is found to have an impact signal relative to the initial state information, the host considers that asphalt is found to be broken, an external button is triggered to press down, and the controller is controlled to record an asphalt ductility value; the impact signal is a signal with the amplitude of more than 20mm in which the amplitude of a certain moment appearing in the output distance information is larger than that of the adjacent moment, namely + -1 s, when the structural light measuring module measures;
(10) If the asphalt is not broken, scanning is continued.
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| CN112146977A (en) * | 2020-08-05 | 2020-12-29 | 中交基础设施养护集团宁夏工程有限公司 | Performance detector special for asphalt and detection method thereof |
| CN112763137A (en) * | 2020-12-09 | 2021-05-07 | 松诺盟科技有限公司 | Calibration method of pressure sensor |
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