Asphalt material strain tensile test device

Abstract

The utility model discloses a strain tensile test device for an asphalt material. The strain tensile test device comprises a fixed handle, a movable handle, a tension detection unit, a driving unit and a microscopic imaging device used for acquiring an image of a sample to be detected. A fixed clamping part is arranged at the front end of the fixed handle, a movable clamping part is arranged at the front end of the movable handle, and the fixed clamping part and the movable clamping part are symmetrically clamped at the two ends of a sample to be tested; the movable handle is in sliding connection with the fixed handle; the driving unit is used for driving the movable handle to slide back and forth along the fixed handle so as to adjust the distance between the fixed clamping part and the movable clamping part; the tension detection unit is connected between the fixed clamping part and the movable clamping part and used for detecting the tension between the fixed clamping part and the movable clamping part.

Description

Technical Field

[0001] The utility model relates to a field, in particular to an asphalt material strain tensile testing device. Background Art

[0002] Asphalt strain extension is an extension of asphalt's fundamental metric—ductility. The magnitude of strain can be used to determine asphalt's fundamental properties. Currently, asphalt strain extension testing primarily uses asphalt extension equipment to analyze the ductility changes of various modified asphalts, while ignoring the crack changes in the material itself during the extension process.

[0003] In order to analyze the crack extension of asphalt during the tensile change process, patent CN113281190B discloses a direct tensile test device for hydraulic asphalt concrete, including a first tensile clamp 3 and a second tensile clamp 34, the first tensile clamp 3 and the second tensile clamp 34 are opposite to each other, and the test piece 6 is clamped between the first tensile clamp 3 and the second tensile clamp 34; the first tensile clamp 3 includes a C-type clamp 22 and side plates 21 located on both sides of the C-type clamp 22, the side plates 21 and the C-type clamp 22 are connected by bolts 35, the bottom of the C-type clamp 22 is also provided with a screw hole, a screw rod is embedded in the screw hole, and the end of the first floating ball joint (4) away from the first sliding T-row connector 2 is fixedly connected to the first tensile clamp 3 by the screw rod; the second tensile clamp 34 has the same structure as the first tensile clamp 3, the bottom of the second tensile clamp 34 is connected to a Y-type joint 26 through a screw hole, the open end of the Y-type joint 26 is embedded with an I-type joint 27, and also includes a cylindrical pin 9, the Cylindrical pins 9 pass through Y-joint 26 and I-joint 27 in sequence to secure them. The end of I-joint 27 away from Y-joint 26 is connected to the end of second floating ball joint 5 away from second sliding T-connector 2. The diameter of the screw rods of Y-joint 26 and I-joint 27 is no less than 20 mm. Specimen 6 is a dumbbell-shaped specimen. The height and width dimensions (b) of the specimen's test area are 3 to 5 times the maximum aggregate size, and the aspect ratio (l / b) of the test area is 1.2 to 1. 5, the ratio of the total length L of the specimen to the middle width b of the test area is 3.5-4.5, the ratio of the total length L to the width B of the end of the specimen is 2.5-3, and the side slope n is 2.5-4; the specimen 6 is located between the first tensile clamp 3 and the second tensile clamp 34, one end of the specimen 6 is embedded in the C-type clamp 22 of the clamp, and the specimen 6 is fixed to the C-type clamp 22 by a strong adhesive layer 24. A 1mm-2mm thick rubber pad 25 is also provided between the side plate 21 and the specimen 6.

[0004] However, the tensile testing apparatus disclosed in the aforementioned patent is complex and cumbersome to operate, making it difficult to quickly and accurately calibrate the crack area. Furthermore, the specimen 6 in the referenced document is fixed to the C-shaped fixture 22 via a strong adhesive layer 24, making it difficult to remove the specimen after the tensile test or to observe it during the test. Utility Model Content

[0005] The purpose of the utility model is to provide an asphalt material strain tensile testing device to solve the problems of the existing asphalt material strain tensile testing device having a complex structure and troublesome operation.

[0006] In order to solve the above technical problems, the present invention provides an asphalt material strain tensile testing device, comprising a fixed handle, a movable handle, a tension detection unit and a driving unit;

[0007] The front end of the fixed handle is provided with a fixed clamping part, and the front end of the movable handle is provided with a movable clamping part, and the fixed clamping part and the movable clamping part are symmetrically clamped at both ends of the sample to be tested;

[0008] A movable handle is slidably connected to the fixed handle; a driving unit is used to drive the movable handle to slide back and forth along the fixed handle to adjust the distance between the fixed clamping portion and the movable clamping portion;

[0009] The tension detection unit is connected between the fixed clamping part and the movable clamping part, and is used for detecting the tension between the fixed clamping part and the movable clamping part.

[0010] Furthermore, the fixed clamping part includes a C-shaped fixed clamping body and a first stretching part and a second stretching part arranged at both ends of the fixed clamping body. The first stretching part and the second stretching part respectively protrude from the middle side of the two ends of the fixed clamping body and act on the H-shaped recessed part of the sample to be tested.

[0011] Furthermore, the movable clamping part includes a C-shaped movable clamping body and a third stretching part and a fourth stretching part arranged at both ends of the movable clamping body. The third stretching part and the fourth stretching part respectively protrude from the middle side of the two ends of the movable clamping body and act on the H-shaped recessed part of the sample to be tested.

[0012] Furthermore, the fixed clamping part is provided with a first stretching part on one side fixedly connected to the fixed handle, and the movable clamping part is provided with a third stretching part on one side fixedly connected to the movable handle; the first stretching part is provided with a first groove body that is recessed toward the side away from the third stretching part on a side facing the third stretching part, and the third stretching part is provided with a second groove body that is recessed toward the side away from the first stretching part on a side facing the first stretching part, the first groove body and the second groove body are buckled together to form an equipment installation groove, the tension detection unit is installed in the equipment installation groove, and the two tension transmission parts of the tension detection unit are fixedly connected to the inner walls of the first groove body and the second groove body respectively.

[0013] Furthermore, a slide groove is provided on the side of the fixed handle facing the movable handle, and a slide rail is provided on the movable handle to cooperate with the slide groove. The fixed handle and the movable handle are slidingly connected through the mutually cooperating slide grooves and slide rails; the driving unit includes a screw and a screw driver, one end of the screw extends through the movable handle into the first groove body and is rotatably connected to the first stretching part, and the other end of the screw extends to the outside of the movable handle and is connected to the screw driver.

[0014] Furthermore, the screw driver is a screw that is fixedly connected.

[0015] Furthermore, the fixed clamping body, the first stretching portion, the second stretching portion and the fixed handle are integrally formed.

[0016] Furthermore, the movable clamping body, the third stretching portion, the fourth stretching portion and the movable handle are integrally formed.

[0017] Furthermore, a digital display module connected to the tension detection unit signal is provided on a side of the fixed handle away from the fixed clamping portion.

[0018] Furthermore, the device also includes a microscopic imaging device for collecting images of the sample to be tested.

[0019] The beneficial effects of the utility model are:

[0020] 1. By adopting a fixed handle and a movable handle that can slide relative to each other, and driving the movable handle to slide back and forth along the fixed handle through a driving unit, the distance between the fixed clamping part and the movable clamping part can be adjusted, thereby adjusting the force exerted by the fixed clamping part and the movable clamping part on the test piece. The device has a simple structure and is very easy to operate. Only the driving unit needs to be adjusted to adjust the tension of the sample to be tested.

[0021] 2. A first stretching action portion and a second stretching action portion are respectively provided at both ends of the fixed clamping body to act on the H-shaped recessed portion of the sample to be tested, and a third stretching action portion and a fourth stretching action portion are respectively provided at both ends of the movable clamping body to act on the H-shaped recessed portion of the sample to be tested; when conducting a tensile test, the two vertical parts of the sample to be tested are respectively placed in the C-shaped fixed clamping body and the movable clamping body, and then the stretching action portion directly applies a tensile force to the two vertical parts of the sample to be tested; the sample to be tested in the present application can be directly placed between the fixed clamping portion and the movable clamping portion, and does not need to be aligned and fixed using glue, which greatly facilitates the installation and removal of the sample to be tested.

[0022] 3. By setting up an equipment installation slot and installing the tension detection unit in the equipment installation slot, the tension detection unit can be protected during non-testing periods. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to represent the same or similar parts. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 It is a structural schematic diagram when the fixed clamping part and the movable clamping part are close to each other.

[0025] Figure 2 It is a structural diagram when the fixed clamping part and the movable clamping part are separated from each other.

[0026] Figure 3 It is a structural schematic diagram of the fixed handle and the fixed clamping part.

[0027] Figure 4 It is a structural diagram of the movable handle and the movable clamping part.

[0028] Figure 5 Schematic diagram of the structure of the sample to be tested.

[0029] Among them: 1. Fixed handle; 11. First stretching part; 111. First groove; 12. Fixed clamping part; 13. Second stretching part; 14. Slide; 2. Movable handle; 21. Third stretching part; 211. Second groove; 22. Movable clamping part; 23. Fourth stretching part; 24. Slide rail; 3. Screw; 31. Twist; 4. Equipment installation slot; 5. Tension sensor; 6. Digital display module. DETAILED DESCRIPTION

[0030] like Figure 1 and Figure 2 The asphalt material strain tensile testing device shown includes a fixed handle 1, a movable handle 2, a tension detection unit and a driving unit; the front end of the fixed handle 1 is provided with a fixed clamping part 12, and the front end of the movable handle 2 is provided with a movable clamping part 22, and the fixed clamping part 12 and the movable clamping part 22 are symmetrically clamped at both ends of the sample to be tested; the movable handle 2 is slidingly connected to the fixed handle 1; the driving unit is used to drive the movable handle 2 to slide back and forth along the fixed handle 1 so as to adjust the distance between the fixed clamping part 12 and the movable clamping part 22; the tension detection unit is connected between the fixed clamping part 12 and the movable clamping part 22, and is used to detect the tension between the fixed clamping part 12 and the movable clamping part 22.

[0031] The present application adopts a fixed handle 1 and a movable handle 2 that can slide relative to each other, and drives the movable handle 2 to slide back and forth along the fixed handle 1 through a driving unit to adjust the distance between the fixed clamping part 12 and the movable clamping part 22, thereby adjusting the force exerted by the fixed clamping part 12 and the movable clamping part 22 on the test piece. The device has a simple structure and is very easy to operate. The tension of the sample to be tested can be adjusted by simply adjusting the driving unit.

[0032] According to one embodiment of the present application, Figure 3 As shown, the fixed clamping portion 12 includes a C-shaped fixed clamping body and a first stretching portion 11 and a second stretching portion 13 provided at both ends of the fixed clamping body. The first stretching portion 11 and the second stretching portion 13 protrude from one side of the middle of the two ends of the fixed clamping body and act on the H-shaped sample to be tested (such as Figure 5 The angles between the first and second stretching portions 11, 13 and the C-shaped fixed clamping body are right angles, which are suitable for the H-shaped sample to be tested. During the stretching process, the first and second stretching portions 11, 13 apply force to the vertical portion of the sample to be tested on the same side as the fixed clamping portion 12.

[0033] According to one embodiment of the present application, Figure 4 As shown, the movable clamping portion 22 includes a C-shaped movable clamping body and a third stretching portion 21 and a fourth stretching portion 23 disposed at either end of the movable clamping body. The third stretching portion 21 and the fourth stretching portion 23 protrude from one side of the center of the movable clamping body and act on the recessed portion of the H-shaped sample to be tested. Similarly, the angles between the third stretching portion 21 and the fourth stretching portion 23 and the C-shaped fixed clamping body are right angles that are compatible with the H-shaped sample to be tested. During the stretching process, the third stretching portion 21 and the fourth stretching portion 23 apply force to the vertical portion of the sample to be tested on the same side as the movable clamping portion 22.

[0034] In the present application, a first stretching portion 11 and a second stretching portion 13 are respectively provided at both ends of the fixed clamping body to act on the H-shaped recessed portion of the sample to be tested, and a third stretching portion 21 and a fourth stretching portion 23 are respectively provided at both ends of the movable clamping body to act on the H-shaped recessed portion of the sample to be tested. When conducting a tensile test, the two vertical parts of the sample to be tested are respectively placed in the C-shaped fixed clamping body and the movable clamping body, and then the stretching portions are directly used to apply a tensile force to the two vertical parts of the sample to be tested. The sample to be tested in the present application can be directly placed between the fixed clamping portion 12 and the movable clamping portion 22, and does not need to be aligned and fixed using glue, which greatly facilitates the installation and removal of the sample to be tested.

[0035] According to one embodiment of the present application, the fixed clamping portion 12 includes a first tensile portion 11 on one side fixedly connected to the fixed handle 1, and the movable clamping portion 22 includes a third tensile portion 21 on one side fixedly connected to the movable handle 2. A first groove 111 is provided on the side of the first tensile portion 11 facing the third tensile portion 21, recessed away from the third tensile portion 21. A second groove 211 is provided on the side of the third tensile portion 21 facing the first tensile portion 11, recessed away from the first tensile portion 11. The first groove 111 and the second groove 211 engage to form a device mounting groove 4. The tension detection unit is mounted within the device mounting groove 4, and the two tension transmission portions of the tension detection unit are fixedly connected to the inner walls of the first groove 111 and the second groove 211, respectively. By providing the device mounting groove 4 and installing the tension detection unit within the device mounting groove 4, the tension detection unit can be protected during non-testing periods. The tension detection unit includes a tension sensor 5 and two tension transmission parts connected to the tension sensor 5, which are respectively connected to the first slot body 111 and the second slot body 211 through a tension spring.

[0036] According to one embodiment of the present application, a slide groove 14 is provided on the side of the fixed handle 1 facing the movable handle 2, and a slide rail 24 is provided on the movable handle 2 to cooperate with the slide groove 14. The fixed handle 1 and the movable handle 2 are slidingly connected through the mutually cooperating slide grooves 14 and slide rails 24; the driving unit includes a screw rod 3 and a screw 3 driver, one end of the screw rod 3 passes through the movable handle 2 and extends into the first groove body 111 and is rotatably connected to the first stretching part 11, and the other end of the screw rod 3 extends to the outside of the movable handle 2 and is connected to the screw driver.

[0037] According to one embodiment of the present application, the screw driver is a screw 31 fixedly connected to the screw 3. The tester can manually adjust the rotation of the screw 3 by screwing 31, thereby driving the movable handle 2 to slide along the fixed handle 1. When the screw 31 is rotated clockwise, the device is used to apply stress to the sample to be tested, causing the sample to be stretched and strained, and the value on the digital display module increases accordingly; when it is rotated counterclockwise, the device is restored to its initial state, and the value returns to 0. In addition to manual operation, the screw 3 can also be driven by a motor.

[0038] According to one embodiment of the present application, the fixed clamping body, the first stretching portion 11 , the second stretching portion 13 and the movable handle 2 are integrally formed.

[0039] According to one embodiment of the present application, the movable clamping body, the third stretching portion 21 , the fourth stretching portion 23 and the movable handle 2 are integrally formed.

[0040] According to one embodiment of the present application, a digital display module 6 connected to the tension detection unit signal is provided on the side of the fixed handle 1 away from the fixed clamping portion 12. The digital display module 6 can display the data detected by the tension detection unit in real time.

[0041] According to one embodiment of the present application, the device also includes a microscopic imaging device for capturing images of the sample to be tested. This microscopic imaging device not only facilitates the observation and acquisition of clear asphalt cracks, but also enables direct image transmission to a computer, enabling rapid demarcation and quantification of crack area using the computer system and ImageView software.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A strain tensile testing device for asphalt materials, characterized in that: It includes a fixed handle, a movable handle, a tension detection unit and a driving unit; The front end of the fixed handle is provided with a fixed clamping portion, and the front end of the movable handle is provided with a movable clamping portion, and the fixed clamping portion and the movable clamping portion are symmetrically clamped at both ends of the sample to be tested; The movable handle is slidably connected to the fixed handle; the driving unit is used to drive the movable handle to slide back and forth along the fixed handle to adjust the distance between the fixed clamping part and the movable clamping part; The tension detection unit is connected between the fixed clamping part and the movable clamping part, and is used to detect the tension between the fixed clamping part and the movable clamping part.

2. The asphalt material strain tensile testing device according to claim 1, characterized in that: The fixed clamping part includes a C-shaped fixed clamping body and a first stretching part and a second stretching part arranged at both ends of the fixed clamping body. The first stretching part and the second stretching part respectively protrude from the middle side of the two ends of the fixed clamping body and act on the H-shaped recessed part of the sample to be tested.

3. The asphalt material strain tensile testing device according to claim 2, characterized in that: The movable clamping part includes a C-shaped movable clamping body and a third stretching part and a fourth stretching part arranged at both ends of the movable clamping body. The third stretching part and the fourth stretching part respectively protrude from the middle side of the two ends of the movable clamping body to act on the H-shaped recessed part of the sample to be tested.

4. The asphalt material strain tensile testing device according to claim 3, characterized in that: The fixed clamping part is provided with a first stretching part on one side which is fixedly connected to the fixed handle, and the movable clamping part is provided with a third stretching part on one side which is fixedly connected to the movable handle; the first stretching part is provided with a first groove body which is recessed toward the side away from the third stretching part on a side facing the third stretching part, and the third stretching part is provided with a second groove body which is recessed toward the side away from the first stretching part on a side facing the first stretching part, the first groove body and the second groove body are buckled together to form an equipment installation groove, the tension detection unit is installed in the equipment installation groove, and the two tension transmission parts of the tension detection unit are fixedly connected to the inner walls of the first groove body and the second groove body respectively.

5. The asphalt material strain tensile testing device according to claim 4, characterized in that: A slide groove is provided on the side of the fixed handle facing the movable handle, and a slide rail is provided on the movable handle to cooperate with the slide groove. The fixed handle and the movable handle are slidingly connected through the mutually cooperating slide groove and slide rail; the driving unit includes a screw and a screw driver, one end of the screw passes through the movable handle and extends into the first groove body and is rotatably connected to the first stretching part, and the other end of the screw extends to the outside of the movable handle and is connected to the screw driver.

6. The asphalt material strain tensile testing device according to claim 5, characterized in that: The screw driver is a screw that is fixedly connected.

7. The asphalt material strain tensile testing device according to claim 5, characterized in that: The fixed clamping body, the first stretching portion, the second stretching portion and the fixed handle are integrally formed.

8. The asphalt material strain tensile testing device according to claim 6, characterized in that: The movable clamping body, the third stretching portion, the fourth stretching portion and the movable handle are integrally formed.

9. The asphalt material strain tensile testing device according to claim 1, characterized in that: A digital display module connected to the tension detection unit signal is provided on a side of the fixed handle away from the fixed clamping portion.

10. The asphalt material strain tensile testing device according to claim 1, characterized in that: The device also includes a microscopic imaging device for collecting images of the sample to be tested.

Images