CN217900757U - Marshall test piece height measurement device - Google Patents
Marshall test piece height measurement device Download PDFInfo
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- CN217900757U CN217900757U CN202221727685.6U CN202221727685U CN217900757U CN 217900757 U CN217900757 U CN 217900757U CN 202221727685 U CN202221727685 U CN 202221727685U CN 217900757 U CN217900757 U CN 217900757U
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Abstract
The utility model relates to a in bituminous mixture experimental facilities technical field, concretely relates to marshall test piece height measurement device, include: the bottom of the first shell is connected with a second shell; one of the laser range finders is distributed in the center of the bottom of the first shell, and the other laser range finders are uniformly distributed on the circumference of the center of the bottom of the first shell; a through hole group is arranged right below the laser range finder and comprises a laser transmitting through hole and a laser receiving through hole; the bottom of the second shell is used for connecting with the top of a Marshall test standard compaction test die. The utility model discloses possess measurement accuracy height, efficient, easy operation and the convenient advantage that removes.
Description
Technical Field
The utility model relates to a in bituminous mixture experimental facilities technical field, especially a marshall test piece height measurement device.
Background
In modern traffic, asphalt pavements are an extremely important component. A large number of tests in the current asphalt mixture specification 'road engineering asphalt and asphalt mixture test procedure' JTG E20-2011 all need to form Marshall test pieces, and the Marshall test is an important test for designing asphalt mixtures in China and is an important basis for determining the designed asphalt-to-stone ratio of asphalt mixtures. The Marshall test has strict requirements on the height of the Marshall test piece, and the Marshall test piece formed by the T0702 standard compaction method meets the requirement of the height of 63.5 +/-1.3 mm. Therefore, when the marshall test piece is prepared by using the marshall compaction tester, the marshall test piece needs to be measured after compaction is finished each time, and whether the marshall test piece meets the standard requirements or not is judged. At present, the height of a Marshall test piece without demoulding is measured by respectively measuring the height difference between the surface of the test piece and the top end of a test mould by a depth vernier caliper, and then the sum of the two height differences is subtracted by the height of the test mould. The measuring method is complex in operation, inconvenient to operate by one hand and low in measuring speed, test errors are increased due to two times of measurement, measuring accuracy is low, and experiment progress is influenced. And if the height of the test piece does not meet the requirements of 63.5mm +/-1.3 mm, the quality of the asphalt mixture for manufacturing the Marshall test piece next time needs to be adjusted according to the relation between the quality and the height, a calculator is needed, the precision is low, the operation is complicated, the obtained test piece is inaccurate in height, and the test result is influenced.
At present, the special Marshall test piece height measuring tool is less, and the problems of low measuring precision and inconvenient operation exist. The device for measuring the height of the Marshall test piece is characterized in that the device for measuring the height of the Marshall test piece is related to the existing Chinese patent document CN205156867U, the height of the Marshall test piece is measured only by fixing the test piece on a workbench when the height of the Marshall test piece is measured, the operation is inconvenient, the workbench is large and needs to be connected with an external power supply, the movement is inconvenient, and the height of the Marshall test piece cannot be measured conveniently. Another chinese patent CN210375001U also adopts a fixed marshall test piece height measuring device, and its working principle is that the compacted and formed marshall test piece is placed on a test bed, one end of a supporting and fixing frame is fixed on the test bed, the other end is connected with a laser distance measuring sensor, the laser distance measuring sensor is placed above the compacted and formed marshall test piece, and the measuring data of the laser distance measuring instrument is single, so that the device is not easy to move, and the measuring precision is not accurate.
SUMMERY OF THE UTILITY MODEL
To the above defect, the utility model aims to provide a marshall test piece height measuring device, through being equipped with first casing, second casing and odd group laser range finder, solve current marshall test piece height measuring device and have that measurement accuracy is not high, complex operation and the slow defect of measuring speed, secondly the bottom of second casing can hit real examination mould top with current marshall test standard and be connected, solved the great not convenient for of current marshall height measuring device and removed, marshall test standard hits real examination mould's single problem of fixed mode.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a marshall test piece height measurement device which characterized in that includes: the bottom of the first shell is connected with a second shell;
one of the laser range finders is distributed at the center of the bottom of the first shell, and the other laser range finders are uniformly distributed on the circumference of the center of the bottom of the first shell; a through hole group is arranged under the laser range finder and comprises a laser transmitting through hole and a laser receiving through hole;
the bottom of the second shell is used for being connected with the top of a Marshall test standard compaction test die.
Preferably, the cross sections of the lower part of the first shell and the second shell are circular, and the outer diameter of the second shell is the same as that of the Marshall test standard striking die.
Preferably, the bottom of the second shell is an annular groove with a concave inner wall, the top of the marshall test standard striking die is provided with an annular protrusion, and the annular protrusion on the top of the marshall test standard striking die is inserted into the annular groove.
Preferably, the depth of the annular groove is consistent with the height of the annular bulge at the top of the Marshall test standard compaction test die; the inner surface of the annular groove and the inner surface of the Marshall test standard compaction test die form a smooth surface.
Preferably, a power supply and a PLC (programmable logic controller) are installed inside the first shell, and a touch display screen, a power switch and a distance measuring button are installed outside the first shell; the power supply, touch-control formula display screen, laser range finder, switch with range finding button with PLC controller electric connection.
Preferably, the inner height of the second shell is 60-80mm.
Preferably, the number of the laser range finders is at least 5, the through holes are at least provided with 5 groups, and each group of the through holes corresponds to the number and the positions of the laser range finders.
Preferably, the first shell is a metal shell, and the second shell is a polybutylene terephthalate plastic shell.
The utility model provides a technical scheme can include following beneficial effect:
1. the utility model discloses a there is odd group's laser range finder at first casing bottom center and central circumference evenly distributed, is equipped with laser emission through-hole and laser receiving through-hole simultaneously under laser range finder, can avoid because the result error that the high error of the different positions of test piece produced, simultaneously the utility model discloses still possess the advantage that measurement accuracy is high, efficient, easy operation and convenient removal.
Secondly, the bottom of second casing can hit real examination mould top with current marshall test standard and be connected, realizes laser range finder and marshall test standard and hits real examination mould's location, places marshall test standard and hit real examination mould's fixed mode for among the prior art at the workstation/examine test table, the utility model discloses a structure is simpler.
2. The connecting structure at the bottom of the second shell is matched with the top structure of the existing Marshall test standard compaction test mold, the structure of the existing Marshall test standard compaction test mold is fully utilized, and meanwhile, the inner surface of the circular groove is connected with the inner surface of the Marshall test standard compaction test mold to form a smooth and non-convex surface, so that the effects of ensuring the measurement precision and simply and conveniently installing the test mold are realized, and the structure of the Marshall test piece height measuring device can be simplified.
3. The first shell is preferably a metal shell which has the characteristics of firmness and scratch resistance; the second shell is preferably a polybutylene terephthalate plastic shell, has the characteristics of high thermal stability, electrical insulation property and compatibility, can effectively cope with the situation that the heating temperature is high before Marshall standard compaction test mold measurement, and prevents the shell from being damaged by high temperature.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a side view of the structure of the present invention;
FIG. 3 is a schematic view of the connection between the present invention and a Marshall test standard compaction test model;
FIG. 4 is a top view of the present invention;
fig. 5 is a bottom view of the structure of the present invention;
fig. 6 is an enlarged schematic view of a set of laser range finders and through holes of the present invention;
fig. 7 is an electrical schematic diagram of the structure of the present invention;
in the figure: the device comprises a first shell 1, a second shell 2, a power supply 3, a touch display screen 4, a laser range finder 5, a laser transmitter mounting through hole 6, a laser receiver mounting through hole 7, a power switch 8, a range button 9, a PLC (programmable logic controller) 10, a Marshall test standard compaction test die 11, a Marshall test piece 12 and a circular groove 13.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
As shown in fig. 1 and 2, an embodiment of the present invention provides a marshall test piece height measuring device, which includes a first housing 1, wherein a second housing 2 is connected to the bottom of the first housing 1;
as shown in fig. 4, the portable electronic device further comprises an odd number of laser range finders 5, wherein one of the laser range finders 5 is distributed at the center of the bottom 1 of the first shell, and the other laser range finders are uniformly distributed on the circumference of the center of the bottom of the first shell 1;
as shown in fig. 6, a through hole group is arranged right below the laser range finder 5, and the through hole group comprises a laser emitting through hole 6 and a laser receiving through hole 7; the bottom of the second housing 2 is adapted to be connected to the top of the marshall test standard pummel jig 11.
As shown in fig. 1, the bottom of the second housing 2 can be connected to the top of the existing marshall test standard striking and testing mold 11, so as to position the laser range finder 5 and the marshall test standard striking and testing mold 11, and compared with the prior art in which the marshall test standard striking and testing mold is placed on a workbench/detection bench, in this embodiment, the positioning of the marshall test standard striking and testing mold 11 is more accurate, and alignment operation is not required during the installation of the marshall test standard striking and testing mold 11, so that the measurement operation is simple and fast. In addition, in this embodiment, during measurement, the marshall test standard striking test die 11 may be used as a base of the marshall test piece height measuring device, based on the weight of the measuring device, the tight connection between the bottom of the second housing 2 and the top of the marshall test standard striking test die 11 is consistent during each measurement, each measurement can ensure that the distance between the laser range finder 5 and the marshall test piece 12 is the same, the conditions for multiple measurements are consistent, and the structure of the marshall test piece height measuring device is simple.
Compared with the existing method for measuring the height of the unmolded Marshall test piece by adopting a depth vernier caliper, the measuring method is complicated and the measuring accuracy is not high; in addition, the conventional Marshall test piece height measuring device has the problems of large size, inconvenience in movement, single measuring data and the like, and has the advantages of high measuring precision, high efficiency, simplicity in operation and convenience in movement.
Based on the fact that the existing marshall test standard compaction test die 11 is cylindrical, the second shell 2 is also limited to be cylindrical, and in order to facilitate the connection and fixation of the device and the marshall test standard compaction test die 11, as shown in fig. 4 and 5, the cross sections of the lower portion of the first shell 1 and the second shell 2 are circular, and the outer diameter of the second shell 2 is the same as the outer diameter of the marshall test standard compaction test die 11. On the other hand, when the Marshall test standard compaction test die 11 is installed, the installation angle of the Marshall test standard compaction test die 11 does not need to be aligned, and the operation is intuitive and simple.
It should be noted that, in order to fully utilize the structure of the actual marshall test standard striking and testing mold 11, the connecting structure at the bottom of the second housing 2 can be matched with the structure at the top of the actual marshall test standard striking and testing mold 11, as shown in fig. 3, the bottom of the second housing 2 is an annular groove 13 with a concave inner wall, and an annular protrusion at the top of the marshall test standard striking and testing mold 11 can be inserted into the annular groove 13, so that the effect of simple and convenient installation of the testing mold can be realized, and the structure of the marshall test piece height measuring device can be simplified.
In order to further improve the bonding effect between the second shell 2 and the marshall test standard compaction test model 11, the depth of the annular groove 13 at the bottom of the second shell 2 is consistent with the height of the annular protrusion at the top of the marshall test standard compaction test model 11, and after installation, the inner surface of the annular groove 13 at the bottom of the second shell 2 and the inner surface of the marshall test standard compaction test model 11 form a smooth surface. It should be noted that, when the measurement is performed, if the joint of the second housing 2 and the test mold has a protruding position, the interference may be caused to the light reflection, and the measurement accuracy is affected, so that the inner surface of the annular groove 13 and the inner surface of the marshall test standard striking test mold 11 are connected to form a smooth surface without protrusions, and the measurement accuracy can be ensured.
In order to simplify the measuring step of testing the height of the Marshall test piece, the power supply 3 and the PLC controller 10 are arranged in the first shell 1 of the utility model, and the touch display screen 4, the power switch 8 and the distance measuring button 9 are arranged outside the first shell 1; the power supply 3, the touch display screen 4, the laser range finder 5, the power switch 8 and the range finding button 9 are electrically connected with the PLC 10.
The power supply 3 supplies power to the PLC 10, the touch display screen 4 and the laser range finder 5, after the power switch 8 is pressed down, the power utilization part starts to be powered on, then the range finding button 9 is pressed down, and the laser range finder 5 can start to measure. The PLC 10 can receive the measurement result of the laser range finder 5, calculate the height of the measured Marshall test piece according to the measurement result, and display the height on the touch display screen 4.
Preferably, power 3 is the battery, because the battery volume is less, and the installation of being convenient for is fixed, is favorable to the removal of equipment, need not to connect fixed power and also can continuously work. Furthermore, the touch display screen 4 can perform parameterization operation, data zero clearing, equipment measurement and other functions through the screen, and measurement results can be observed from the screen more intuitively and are convenient for testers to judge quickly.
It should be noted that in order to provide sufficient distance for laser reflection and ensure measurement accuracy, the internal height of the second housing 2 is 60-80mm. In one embodiment, the internal height of the second housing 2 is preferably 70mm, and the result can be obtained by the calculation formula: the Marshall test standard compaction test die height h1+ the second shell interior height h 2-the Marshall test piece is placed at the installation height h3 of the Marshall test compaction test die-the average distance h4 from the distance meter to the surface of the Marshall test piece = the height of the Marshall test piece.
As shown in fig. 5 and 6, the utility model discloses be provided with 5 even laser range finder 5 of distribution and 5 group's through-holes at least, every group through-hole is corresponding with laser range finder 5's quantity and position. The laser range finder 5 can send out laser from the laser emission through-hole 6 and measure, receives the laser after the reflection through laser receiving through- hole 7, and 5 sets of measured data can be compared automatically to PLC controller 10, obtain average value to reduce the error, measure more accurate marshall test piece height, avoided because the result error that the high error of test piece different positions produced.
The first shell 1 of the utility model is preferably a metal shell, which has the characteristics of firmness and scratch resistance; the second shell 2 is preferably a polybutylene terephthalate plastic shell, has the characteristics of high thermal stability, electrical insulation property and compatibility, and can effectively cope with the situation that the heating temperature is high before Marshall standard compaction test mold measurement, so that the shell is prevented from being damaged by high temperature.
The utility model discloses an operation process as follows:
the utility model is arranged on the top of a Marshall standard compaction test mould, a power switch 8 controls a power supply 3 of the utility model, and the switch needs to be opened before use and closed after use;
after the power supply 3 is started, clicking the touch display screen 4, and inputting the quality of the asphalt mixture used for measuring the height of the Marshall test piece at this time;
the laser range finder 5 starts to work by pressing a range button 9, laser is emitted from a laser emitting through hole 6, passes through a Marshall test standard compaction test die 11 fixed at the bottom of a second shell 2, and then receives the reflected laser through a laser receiving through hole 7, and a PLC controller receives information fed back by the laser range finder through a set formula, namely the height h1 of the Marshall test standard compaction test die and the height h2 of the interior of the second shell, namely the installation height h3 of the Marshall test compaction test die and the average distance h4 from the range finder to the surface of the Marshall test piece = the height of the Marshall test piece, and after calculation through the formula, the height of the Marshall test piece to be measured is displayed on a touch display screen 4; and according to a formula T0702-1 in JTG E20-2011, the optimal asphalt mixture mass = (63.5 mm original mixture mass)/the height of the obtained test piece, so that the optimal mass required by preparing the Marshall test piece from the asphalt mixture is obtained.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and is not to be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.
Claims (8)
1. A Marshall test piece height measurement device, its characterized in that includes:
the bottom of the first shell is connected with a second shell;
one of the laser range finders is distributed in the center of the bottom of the first shell, and the other laser range finders are uniformly distributed on the circumference of the center of the bottom of the first shell;
a through hole group is arranged under the laser range finder and comprises a laser transmitting through hole and a laser receiving through hole;
the bottom of the second shell is used for being connected with the top of a Marshall test standard compaction test die.
2. The device for measuring the height of a marshall test piece according to claim 1, wherein the cross sections of the lower portion of the first shell and the second shell are circular, and the outer diameter of the second shell is the same as the outer diameter of the standard tapping jig of the marshall test.
3. The device for measuring the height of the marshall test piece as claimed in claim 1, wherein the bottom of the second housing is an annular groove with a concave inner wall, the top of the marshall test standard striking die is provided with an annular protrusion, and the annular protrusion on the top of the marshall test standard striking die is inserted into the annular groove.
4. The Marshall test piece height measurement device of claim 3, wherein the depth of the annular groove is consistent with the height of the annular bulge at the top of the Marshall test standard compaction test die;
the inner surface of the annular groove and the inner surface of the Marshall test standard compaction test die form a smooth surface.
5. The Marshall test piece height measuring device of claim 1, wherein a power supply and a PLC controller are installed inside the first shell, and a touch display screen, a power switch and a distance measuring button are installed outside the first shell;
the power supply, touch-control formula display screen, laser range finder, switch with range finding button with PLC controller electric connection.
6. A marshall specimen height measuring device according to claim 1, wherein the internal height of the second housing (2) is 60-80mm.
7. A marshall test piece height measuring device according to claim 1, wherein there are at least 5 laser distance measuring devices (5), and there are at least 5 sets of through holes, each set corresponding to the number and positions of the laser distance measuring devices (5).
8. A marshall test piece height measuring device according to claim 1, wherein the first housing (1) is a metal housing and the second housing (2) is a plastic housing of polybutylene terephthalate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221727685.6U CN217900757U (en) | 2022-07-06 | 2022-07-06 | Marshall test piece height measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221727685.6U CN217900757U (en) | 2022-07-06 | 2022-07-06 | Marshall test piece height measurement device |
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| Publication Number | Publication Date |
|---|---|
| CN217900757U true CN217900757U (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221727685.6U Active CN217900757U (en) | 2022-07-06 | 2022-07-06 | Marshall test piece height measurement device |
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| CN (1) | CN217900757U (en) |
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- 2022-07-06 CN CN202221727685.6U patent/CN217900757U/en active Active
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