Device for testing anti-shearing performance of composite rubber and plastic modified asphalt stress absorbing layer

Abstract

The utility model discloses a composite rubber and plastic modified asphalt stress absorbing layer anti-shearing performance testing device, which relates to the technical field of asphalt performance testing and comprises a testing device box body, a servo motor is arranged at the top of the testing device box body, and a control panel is arranged on one side of the testing device box body. A shear loading assembly and a supporting mechanism used for fixing a test piece are arranged on the inner side of the testing device box body, a transmission lead screw is arranged on the shear loading assembly, one end of the transmission lead screw is connected with the output end of a servo motor to achieve vertical sliding in the testing device box body, and a loading wheel is arranged at the other end of the transmission lead screw. And a pressure sensor is arranged at the connection position of the loading wheel and the transmission screw rod and is electrically connected with the control panel. The testing device is simple in structure and low in manufacturing cost, the control panel displays the loading force on the test piece in real time, meanwhile, the change of different shearing angles can be realized by adjusting the wedge-shaped block in the supporting mechanism, the testing device does not need to be replaced, and the testing efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bitumen performance test technical field especially is related to composite type rubber plastic modified bitumen stress absorbing layer shear performance testing device. BACKGROUND

[0002] At present, the common asphalt concrete shear test methods at home and abroad mainly have triaxial test, Superpave shear test, coaxial shear test and rotary shear test. But triaxial test is complex in test operation, so application is less. Superpave shear test must use Superpave shear tester, and it is expensive, not suitable for wide range of popularization and application. Meanwhile, in the prior art, the shear angle is fixed, and the stress state between layers is fixed. If the interlayer shear strength of pavement structure under different stress states is analyzed and evaluated, different angle oblique shear testing devices need to be replaced, and the test efficiency is reduced. Therefore, a composite type rubber plastic modified bitumen stress absorbing layer shear performance testing device which can efficiently test the shear strength of asphalt concrete and is low in manufacturing cost is urgently needed. SUMMARY

[0003] The utility model discloses a composite type rubber plastic modified bitumen stress absorbing layer shear performance testing device, which is simple in structure and low in manufacturing cost. The wedge-shaped block in the supporting mechanism can change the shear angle without replacing the testing device, effectively improving the test efficiency.

[0004] To achieve the above object, the utility model provides a composite type rubber plastic modified bitumen stress absorbing layer shear performance testing device, including testing device box, the top of testing device box is provided with servo motor, one side of testing device box is provided with control panel, the inside of testing device box is provided with shearing loading assembly and the supporting mechanism for fixed test piece, be provided with transmission screw rod on shearing loading assembly, the one end of transmission screw rod is connected with the output of servo motor and realizes the up and down sliding in testing device box, the other end of transmission screw rod is provided with loading wheel, and be provided with pressure sensor at the connecting position of loading wheel and transmission screw rod, pressure sensor is connected with control panel electricity.

[0005] Preferably, the two supporting mechanisms are symmetrically installed on the inner bottom of the testing device box, and each includes a supporting block, a fixed seat, and a wedge-shaped block for adjusting the height thereof. The bottom surface of the supporting block is slidably connected with the inclined surface of the wedge-shaped block. The fixed seat is provided with an adjusting screw on one side. The fixed seat and the wedge-shaped block are slidably connected through the adjusting screw.

[0006] Preferably, the top of the fixing base is provided with a sliding groove, and the bottom of the supporting block is provided with a guide rod, and the supporting block is realized up and down sliding in the sliding groove through the guide rod.

[0007] Preferably, the top of the supporting block is provided with a rectangular groove for fixing the test piece, and the distance between the two rectangular grooves is matched with the length of the test piece.

[0008] Preferably, the loading wheel is cylindrical, and the material of the loading wheel is one of high-strength stainless steel and alloy steel resistant to high pressure.

[0009] Preferably, the test device box is a high-low temperature test box.

[0010] Therefore, the composite rubber-plastic modified asphalt stress absorbing layer shear resistance performance testing device with the above structure has the following beneficial effects compared with the prior art.

[0011] The utility model discloses simple structure, low cost, and the control panel real -time's display to the loading force of test piece, and simultaneously through the wedge-shaped block in adjusting support mechanism can realize the change of different shear angles and need not to replace testing device, improve the test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the overall structure schematic view of the composite rubber-plastic modified asphalt stress absorbing layer shear resistance performance testing device embodiment of the utility model.

[0013] Figure 2 It is the supporting mechanism three-dimensional model of the composite rubber-plastic modified asphalt stress absorbing layer shear resistance performance testing device embodiment of the utility model.

[0014] REFERENCE NUMERALS:

[0015] 1, test device box;2, support mechanism;201, fixing base;202, supporting block;203, wedge-shaped block;204, adjusting screw;205, guide rod;206, rectangular groove;3, shear loading assembly;4, loading wheel;5, transmission screw;6, pressure sensor;7, servo motor;8, control panel;9, test piece. DETAILED DESCRIPTION

[0016] The technical scheme of the utility model is further illustrated by the drawings and embodiments.

[0017] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the ordinary meaning as understood by a person of ordinary skill in the art to which the present application pertains. The terms "first", "second", and similar terms used in the present application do not denote any order, quantity, or importance, but are used to distinguish different components. The terms "comprise", "comprising", and similar terms mean that the elements or objects before the word encompass the elements or objects listed after the word, and equivalents thereof, and do not exclude other elements or objects. The terms "connected" or "connected" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right", and the like are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0018] Embodiment

[0019] Please refer to Figure 1 For the overall structure of the composite rubber modified asphalt stress absorbing layer shear resistance testing device embodiment of the present application, a testing device box 1 is provided with a servo motor 7 at the top, the testing device box 1 is a high-low temperature test box, and a control panel 8 is provided on one side of the testing device box 1, a shear loading assembly 3 and a support mechanism 2 for fixing the test piece 9 are provided on the inner side of the testing device box 1, two support mechanisms 2 are respectively symmetrically installed on the inner side bottom of the testing device box 1, a transmission screw rod 5 is provided on the shear loading assembly 3, one end of the transmission screw rod 5 is connected with the output end of the servo motor 7 to realize up and down sliding movement in the testing device box 1, the other end of the transmission screw rod 5 is provided with a loading wheel 4, wherein the loading wheel 4 is cylindrical, the material of the loading wheel 4 is one of high-pressure resistant high-strength stainless steel and alloy steel, and a pressure sensor 6 is provided at the connecting position of the loading wheel 4 and the transmission screw rod 5, the pressure sensor 6 is electrically connected with the control panel 8, the transmission screw rod 5 drives the loading wheel 4 to move downward to the surface of the test piece 9 and applies pressure to it for shear test, the shear force in the whole process is transmitted to the control panel 8 through the pressure sensor 6, the control panel 8 displays the loading force on the test piece 9 in real time, which is convenient for judging the ultimate shear force of the test piece 9, and the whole testing device has simple structure and low manufacturing cost.

[0020] Please refer to Figure 2The utility model discloses a support mechanism three-dimensional model of composite rubber plastic modified asphalt stress absorption layer shear resistance testing device embodiment, and its support mechanism 2 includes support block 202, fixed base 201 and the wedge block 203 for adjusting its height, the bottom surface of support block 202 and the inclined surface of wedge block 203 are slidably connected, and one side of fixed base 201 is provided with adjusting screw 204, and fixed base 201 and wedge block 203 are slidably connected through adjusting screw 204. The top of fixed base 201 is provided with a sliding slot, the bottom of support block 202 is provided with guide rod 205, and support block 202 is slid up and down in the sliding slot through guide rod 205. The top of support block 202 is provided with rectangular recess 206 for fixing test piece 9, and the distance between the two rectangular recesses 206 is adapted to the length of test piece 9. In the test, test piece 9 is supported between the two rectangular recesses 206, is clamped in rectangular recess 206 and is limited, when the shear resistance of test piece 9 needs to be tested at different angles, only need to rotate adjusting screw 204 on fixed base 201, the height of support block 202 is adjusted through the front and back sliding of wedge block 203, and then the shear angle of test piece 9 can be changed without replacing the testing device, and the test efficiency is improved.

[0021] Therefore, the height of the support block can be changed through the adjusting screw of the support mechanism, the shear angle can be changed without replacing the testing device, and the test efficiency is improved. The utility model has simple structure and low manufacturing cost, and the control panel of the utility model can display the pressure received by the test piece in real time, test the shear force received by the test piece in real time, and facilitate the judgment of the ultimate shear force of the test piece.

[0022] Finally, it should be noted that: the above embodiments are only used to illustrate the technical scheme of the utility model and not to limit it, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: its still can modify or equivalent replacement to the technical scheme of the utility model, and these modifications or equivalent replacements also can not make the modified technical scheme deviate from the spirit and scope of the technical scheme of the utility model.

Claims

1. A composite rubber-modified asphalt stress-absorbing layer shear resistance testing device, characterized in that: The device includes a testing device housing. A servo motor is mounted on the top of the housing, and a control panel is mounted on one side. A shear loading assembly and a support mechanism for fixing the specimen are mounted inside the housing. A transmission screw is mounted on the shear loading assembly. One end of the transmission screw is connected to the output end of the servo motor to allow it to slide up and down within the testing device housing. A loading wheel is mounted on the other end of the transmission screw, and a pressure sensor is mounted at the connection point between the loading wheel and the transmission screw. The pressure sensor is electrically connected to the control panel.

2. The composite rubber-plastic modified asphalt stress-absorbing layer shear resistance testing device according to claim 1, characterized in that: The two support mechanisms are symmetrically installed on the inner bottom of the test device housing, and include a support block, a fixed seat, and a wedge block for adjusting its height. The bottom surface of the support block is slidably connected to the inclined surface of the wedge block. An adjusting screw is provided on one side of the fixed seat, and the fixed seat and the wedge block are slidably connected by the adjusting screw.

3. The composite rubber-plastic modified asphalt stress-absorbing layer shear resistance testing device according to claim 2, characterized in that: The top of the fixed base is provided with a sliding groove, and the bottom of the support block is provided with a guide rod. The support block can slide up and down in the sliding groove through the guide rod.

4. The composite rubber-plastic modified asphalt stress-absorbing layer shear resistance testing device according to claim 3, characterized in that: The top of the support block is provided with a rectangular groove for fixing the specimen, and the distance between the two rectangular grooves is adapted to the length of the specimen.

5. The composite rubber-plastic modified asphalt stress-absorbing layer shear resistance testing device according to claim 4, characterized in that: The loading wheel is cylindrical and is made of either high-strength stainless steel or alloy steel that is resistant to high pressure.

6. The composite rubber-plastic modified asphalt stress-absorbing layer shear resistance testing device according to claim 5, characterized in that: The test device enclosure is a high and low temperature test chamber.

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