Test device for test piece identification and density detection

Abstract

The utility model discloses a test device for test piece identification and density detection, which comprises a measuring module, a visual sensor, a mechanical grabbing module and a computer, and is characterized in that the measuring module is used for measuring the air mass, the water mass and the surface dry mass of a test piece; the visual sensor is used for acquiring a label-containing image of the test piece and reading size parameters of the test piece; the mechanical grabbing module is used for grabbing and placing a test piece, the measuring module, the visual sensor and the mechanical grabbing module are all connected with the computer, the visual sensor can collect images including serial numbers of the test piece and transmit the images to the computer, and the computer can automatically recognize the serial numbers on the test piece. According to the utility model, the serial number of the test piece can be identified, the density of the test piece can be obtained according to test data, and the problem of excessive repeated manual operation in the existing experiment can be solved.

Description

Technical Field

[0001] The utility model relates to the field of asphalt mixture quality and volume test auxiliary devices, in particular to a test device for specimen identification and density detection. Background Art

[0002] So far, asphalt mixture quality and volume testing has not been digitized and intelligentized. Traditional tests are combined with new automation technologies and methods to save manual repetitive test steps. The "Highway Technical Specifications Asphalt Mixture Test Procedures" contains a method for measuring the density of Marshall specimens of asphalt mixtures. According to its guidance, the density of Marshall specimens can be obtained. Similarly, the density of asphalt mixture beam specimens can be measured. The density measurement includes air mass, water mass and surface dry mass.

[0003] When there are a large number of specimens, there are too many repetitive operations in the existing asphalt mixture specimen density detection test method, which takes up most of the time of the above test. Manual operation is insufficient in the accuracy and efficiency of measuring the specimen density, and there is no automatic identification and detection overall device for asphalt mixture specimen density test. Utility Model Content

[0004] The purpose of the utility model is to provide a test device for automatically identifying asphalt mixture beam specimens and asphalt mixture Marshall specimens and performing density measurement, so as to solve the problem of excessive repeated manual operations in the experiments in the above-mentioned background technology, reduce the number of repeated manual operations in the experiments, and provide a reliable basis for the comprehensive performance evaluation of road materials.

[0005] In order to achieve the purpose of the utility model, the utility model provides a device for automatically identifying the specimen serial number to perform asphalt mixture beam density and Marshall specimen density measurement test, including a measuring module, a visual sensor, a mechanical grabbing module and a computer.

[0006] The measuring module is used to measure the air mass, water mass and surface dry mass of the specimen;

[0007] The visual sensor is used to collect the labeled image of the specimen and read the dimensional parameters of the specimen;

[0008] The mechanical grasping module is used to grasp and place the test piece, and the measuring module, visual sensor and mechanical grasping module are respectively connected to the computer. The visual sensor can collect the image of the test piece including the serial number and transmit the image to the computer, and the computer can automatically identify the serial number on the test piece.

[0009] Preferably, the measuring module includes a load-bearing platform, a weighing instrument and a water container. The weighing instrument is used to bear the load and is set on the load-bearing platform. The water container is located below the load-bearing platform. The water container includes a large water container and a small water container that can be immersed below the horizontal plane of the large water container, and the small water container can be connected to the weighing instrument.

[0010] Preferably, a hook is provided on the weighing instrument, and the small water container is fixed on the weighing instrument via the hook.

[0011] Preferably, a water-absorbing cloth is also provided to measure the surface dry mass of the test piece after the water on the surface of the test piece is dried.

[0012] Preferably, the mechanical grasping module comprises a mechanical arm and a mechanical grasping unit, and the mechanical grasping unit is detachably arranged at the end of the mechanical arm.

[0013] Preferably, the visual sensor is fixed on the top of the bracket, and the image of the test piece is transmitted to the computer through the camera and the serial number is automatically identified.

[0014] Preferably, the visual sensor includes a camera for collecting labeled images of the grasped object so as to obtain the serial number of the specimen, and reads the length, width, height and diameter of the specimen and transmits them to a computer for orderly data entry and volume calculation.

[0015] The computer is used for algorithm execution and data export.

[0016] Preferably, the weighing instrument is an electronic scale, and the electronic scale on the test bench is used to measure the air mass, the water mass, and the surface dry mass of the test piece.

[0017] Preferably, the robotic arm includes a plurality of force transmission rods, and adjacent force transmission rods are connected via a rotating shaft.

[0018] Preferably, the mechanical grasping unit includes a beam specimen grasping unit for grasping and placing beam specimens and a Marshall specimen grasping unit for grasping and placing Marshall specimens, and the corresponding grasping unit type is selected according to different specimens. The mechanical grasping module is used to grasp the specimens, and the corresponding type of mechanical grasping unit can be selected according to different types of specimens.

[0019] Preferably, the small beam specimen grasping unit includes two grasping ends, which are connected by a connecting rod, and a clamping hole is opened at the middle position of the connecting rod, and the small beam specimen grasping unit is connected to the end of the robot arm through the clamping hole; the Marshall specimen grasping unit includes a grasping end and a clamping hole is provided on the grasping end for connecting to the end of the robot arm.

[0020] Preferably, the gripping end portion comprises a gripping end fixing end and two gripping unit finger ends, the two gripping unit finger ends are rotatably arranged at two ends of the gripping end fixing end respectively, and a retractable lock buckle is arranged on the gripping unit finger ends.

[0021] Preferably, the fixing end of the grabbing end is in an arc shape.

[0022] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0023] (1) The device of the utility model can facilitate automatic identification of the test piece serial number by setting a visual sensor, and can facilitate automatic weighing of density measurement by setting a weighing instrument.

[0024] (2) The utility model can realize the automatic sampling, placing and weighing process by providing an automatic specimen grabbing structure consisting of an automatic mechanical arm grabbing hand, a support platform and a force transmission rod.

[0025] (3) The fingertips of the mechanical arm of the utility model are provided with an automatic rebound locking device to prevent the specimen from falling during the picking and placing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, among which:

[0027] Figure 1 A schematic diagram of the overall structure of a test device for specimen identification and density detection provided by an embodiment of the utility model;

[0028] Figure 2 Two types of grabbing end schematic diagrams are provided for the embodiments of the utility model;

[0029] Figure 3 The present invention is a flowchart of the use of a test device for specimen identification and density detection according to an embodiment of the present invention.

[0030] In the figure: robotic arm 1, visual sensor 2, measuring module 3, mechanical grasping unit 4, load-bearing platform 5, weighing instrument 6, computer 7, force transmission rod 8, rotating shaft 9, lock 10, support rod 11, water container 12, large water container 13, small water container 14, small beam specimen grasping unit 20, Marshall specimen grasping unit 21, rotating shaft 22, grasping end fixing end 30, grasping unit finger end 31, absorbent cloth 32, opening 33, hook 34. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] See also Figure 1 The utility model provides an experimental device for automatically identifying asphalt mixture specimens and measuring density, including a measuring module 3, a visual sensor 2, a mechanical grasping module and a computer 7 for data aggregation.

[0034] The measuring module 3 includes a load-bearing platform 5, a weighing instrument 6 and a water container 12. The water container 12 includes a large water container 13 and a small water container 14. The weighing instrument 6 is supported and fixed on the load-bearing platform 5, and is used to measure the air quality, water quality and surface dry quality of the specimen. The water container 12 is located below the load-bearing platform 5. The small water container 14 is located in the center of the large water container 13, immersed below the horizontal plane of the large water container 13, and placed directly below the weighing instrument 6 area in the load-bearing platform 5, so as to facilitate the measurement of the water quality. The weighing instrument 6 is provided with an opening 33, and the opening is fixedly connected to a hook 34 by a steel wire rope. After the aerial weight measurement is completed, the small water container 14 is connected to the bottom of the electronic scale through the hook 34 and the opening 33 of the load-bearing platform 5, water is added to the small water container 14 until the water surface overflows, the weighing instrument 6 is reset to zero, and the mechanical grabbing module 4 takes the test piece from the table and puts it into the small water container 14, and water is added to the small water container 14 again until the water surface overflows (adding water again is to avoid changes in water volume caused by the placement of the test piece and the movement of the mechanical grabbing module, which affects the test accuracy), and a stable reading is output to the computer 7.

[0035] The visual sensor 2, whose camera is fixed on the front of the load-bearing platform 5 through the support rod 11, is connected to the computer 7. When the mechanical grasping module releases the specimen in the weighing area of ​​the weighing instrument 6, the visual sensor 2 captures the image of the grasped specimen with the label and transmits the image to the computer 7. The camera of the visual sensor 2 is also used to read the volume parameters such as the length, width and height of the cuboid and the bottom diameter and side height of the cylinder. The volume of the specimen is calculated based on the obtained volume parameters and transmitted to the computer for identification and serial number entry data. The weighing instrument 6 simultaneously obtains the air mass of the specimen and inputs it into the computer 7. The mechanical grasping module takes the specimen from the weighing instrument 6 and places it on the weighing platform 5. After the air mass measurement, the water mass measurement is performed.

[0036] In some embodiments of the present invention, the visual sensor 2 used is C4G7-24G-E00 COGNEX. Of course, this is just a specific example and is not limited to using only this model of sensor.

[0037] In some embodiments of the present invention, the weighing instrument 6 is an electronic scale.

[0038] The mechanical grasping module is connected to the computer 7. The mechanical grasping module includes a mechanical arm 1 and a mechanical grasping unit 4. The mechanical arm 1 is arranged on the side of the load-bearing platform 5. The mechanical arm 1 includes three force transmission rods 8. The three force transmission rods 8 are installed into the mechanical arm 1 with two first rotating shafts 9. The driving control of the mechanical arm is realized by electric connection or wireless connection. The mechanical grasping unit 4 is detachably arranged at the end of the mechanical arm 1. The mechanical grasping unit 4 includes a small beam specimen grasping unit 20 for grasping and placing small beam specimens and a Marshall specimen grasping unit 21 for grasping and placing Marshall specimens. First, different mechanical grasping units 4 are adjusted according to the test object. If it is a small beam specimen, the small beam specimen grasping unit 20 is selected; if it is a Marshall specimen, the Marshall specimen grasping unit 21 is selected. After selecting the corresponding grasping device, the end of the force transmission rod 8 located at the end of the mechanical arm 1 is clamped.

[0039] In some embodiments of the present invention, the beam specimens are cut from rutting plates.

[0040] In some embodiments of the present invention, a clamping hole is provided on the mechanical grabbing unit 4, and the end of the force transmission rod 8 can be clamped and fixed in the clamping hole.

[0041] In some embodiments of the present invention, the beam specimen grabbing unit 20 includes two grabbing ends, the two grabbing ends are connected by a connecting rod, and a clamping hole is opened at the middle position of the connecting rod.

[0042] In some embodiments of the present invention, the Marshall specimen grasping unit 21 includes a grasping end.

[0043] Among them, the grabbing end includes a grabbing end fixed end 30 and two grabbing unit finger ends 31. The two grabbing unit finger ends 31 are respectively rotatably set at the two ends of the grabbing end fixed end 30 through the second rotating shaft 22, and a clamping hole is opened on the grabbing end fixed end 30 of the Marshall specimen grabbing unit 21. The grabbing unit finger end 31 is provided with a retractable lock buckle 10. The initial position of the lock buckle 10 is to extend out of the grabbing unit finger end 31, and can be retracted into the grabbing unit finger end 31 when under pressure.

[0044] In some embodiments of the present invention, the grab end fixing end 30 is in an arc shape, which provides space between the specimen and the mechanical grab end to prevent the protrusion of particles on the edge of the specimen from affecting the grab stability and mechanical wear. Figure 2 The grabbing end portion includes a long arc-shaped segment (fixed end 30), two short segments (grasping unit finger ends 31) vertically arranged and rotatably connected to the long arc-shaped segment, and a lock buckle 10 arranged on the two short segments.

[0045] In some embodiments of the present invention, the lock buckle 10 is in the shape of a prism with a right triangle as the bottom surface, and a groove is provided on the gripping unit finger end 31, and the lock buckle 10 is telescopically arranged on the groove.

[0046] In some embodiments of the present invention, a water-absorbing cloth 32 is further provided, and the water-absorbing cloth 32 can be placed on the load-bearing platform 5. The surface dry mass of the test piece is measured after the water on the surface of the test piece is wiped dry by the water-absorbing cloth 32.

[0047] After the specimens are neatly arranged, the computer 7 is turned on to activate the program for driving the mechanical arm 1 and the visual sensor 2 (the program is an existing program, and the utility model does not involve improvements to the program). When the mechanical grasping unit 4 grasps the specimen, the lock 10 retracts due to pressure. When the bottom of the specimen touches the bottom of the arc of the grasping device 30 and the height is completely immersed in the grasping unit finger end 31, the lock 10 is no longer under pressure and automatically rebounds. The grasping unit finger end applies inward pressure to achieve stable grasping of the specimen. The computer 7 uses an electric connection or a wireless connection to realize the drive control of the rotating shaft 22. When the test is completed and the specimen needs to be put down, the second rotating shaft 22 of the mechanical grasping unit 4 is controlled to rotate to open the finger end to release the specimen from the grasping end.

[0048] The method for measuring the surface dry mass of the asphalt mixture specimen is as follows: the wiped-off specimen is placed on a weighing instrument 6 to obtain the surface dry mass of the specimen, which is input into a computer 7 ; a mechanical grabbing module takes the specimen from the weighing instrument 6 and places it on a load-bearing platform 5 .

[0049] The density calculation formula of the above specimens is:

[0050] The density of the specimen measured by the surface dry method = air mass / (surface dry mass-water mass) × water density at 25°C;

[0051] Density of specimen measured by volume method = air mass / volume of specimen;

[0052] Where: beam specimen volume = length × height × width, Marshall specimen volume = π / 4 × diameter 2 × Column height.

[0053] The novel automatic specimen identification and density measurement device provided in the above embodiments can save the steps of manually repeating the operation of multiple sets of specimens, avoid the test errors of manual measurement, and provide a more efficient test device for the density test of asphalt mixture beam specimens and Marshall specimens. The utility model device is simple to operate and has strong automation and practicality.

[0054] In order to conduct the test more efficiently, in the process of repetitive density measurement of asphalt mixture specimens, the utility model uses automatic visual counting and connects to weighing equipment for data processing. This device can simplify the automated repeated measurement test process of a large number of specimens, eliminating the need for manual counting and cumbersome data input, and improving the efficiency and accuracy of the test. The manipulator can be connected to grab and place the specimens. For different types of specimens, the corresponding type of mechanical grabbing unit is used. The specimen number is identified and extracted using an image recognition method based on automatic vision. The density and porosity of each specimen are calculated through the mass data of the weighing equipment and the volume data in water, and the data is transmitted to the computer to form a report file.

[0055] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] The circuits and internal electronic components and modules involved in the present invention are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to the software.

[0057] The above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it; although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present utility model application can still be modified, or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present utility model application, which should be included in the scope of the technical solution requested for protection in the present utility model application.

Claims

1. A test device for specimen identification and density detection, characterized in that: It includes a measuring module (3), a visual sensor (2), a mechanical grasping module and a computer (7), The measuring module (3) is used to measure the air mass, water mass and surface dry mass of the test piece; The visual sensor (2) is used to collect the labeled image of the test piece and read the size parameters of the test piece; The mechanical grasping module is used to grasp and place the test piece, and the measuring module (3), the visual sensor (2) and the mechanical grasping module are respectively connected to the computer (7); The measuring module (3) comprises a load-bearing platform (5), a weighing instrument (6) and a water container (12); the weighing instrument (6) is used for bearing and arranged on the load-bearing platform (5); the water container (12) is located below the load-bearing platform (5); the water container (12) comprises a large water container (13) and a small water container (14) capable of being immersed below the horizontal plane of the large water container (13); and the small water container (14) can be connected to the weighing instrument (6).

2. A test device for specimen identification and density detection according to claim 1, characterized in that: A hook (34) is provided on the weighing instrument (6), and the small water container (14) is fixed on the weighing instrument (6) via the hook (34).

3. A test device for specimen identification and density detection according to claim 1, characterized in that: It is also equipped with an absorbent cloth to measure the surface dry mass of the specimen after the water on the surface of the specimen is dried.

4. A test device for specimen identification and density detection according to any one of claims 1 to 3, characterized in that: The mechanical grasping module comprises a mechanical arm (1) and a mechanical grasping unit (4); the mechanical grasping unit (4) is detachably arranged at the end of the mechanical arm (1).

5. A test device for specimen identification and density detection according to claim 4, characterized in that: The mechanical arm (1) comprises a plurality of force transmission rods (8), and adjacent force transmission rods (8) are connected via rotating shafts.

6. A test device for specimen identification and density detection according to claim 4, characterized in that: The mechanical grasping unit (4) comprises a small beam specimen grasping unit (20) for grasping and placing small beam specimens and a Marshall specimen grasping unit (21) for grasping and placing Marshall specimens. The corresponding grasping unit type is selected according to different specimens.

7. A test device for specimen identification and density detection according to claim 6, characterized in that: The beam specimen grasping unit (20) comprises two grasping ends, the two grasping ends are connected by a connecting rod, and a clamping hole is provided at the middle position of the connecting rod, and the beam specimen grasping unit (20) is connected to the end of the mechanical arm by clamping through the clamping hole; the Marshall specimen grasping unit (21) comprises a grasping end and a clamping hole is provided on the grasping end for clamping connection with the end of the mechanical arm.

8. A test device for specimen identification and density detection according to claim 7, characterized in that: The gripping end portion comprises a gripping end portion fixed end (30) and two gripping unit finger ends (31). The two gripping unit finger ends (31) are rotatably arranged at two ends of the gripping end portion fixed end (30), and a retractable lock buckle (10) is arranged on the gripping unit finger ends (31).

9. A test device for specimen identification and density detection according to claim 8, characterized in that: The grabbing end fixing end (30) is in an arc shape.

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