Stretching head structure for viscosity and toughness test of high-viscosity asphalt

Abstract

The utility model provides a stretching head structure for a viscosity and toughness test of high-viscosity asphalt, which relates to the technical field of asphalt tests and comprises a sample container and a connecting sleeve, a connecting rod is inserted into the inner surface of the connecting sleeve, and the bottom of the connecting rod is fixedly connected with a stretching head body. According to the utility model, the stretching head body can be accurately aligned with the center of a sample container under the matching of the support frame, the positioning hole and the positioning rod, and the position of the connecting rod in the connecting sleeve can be adjusted under the matching of the spring, the limiting rod, the adjusting hole and the sliding rod, so that the position of the stretching head body is adjusted; by adopting clamping adjustment, the problem that threaded connection needs to be replaced after being used for multiple times is avoided, under the assistance of the semi-sphere and the arc-shaped groove, the contact area between the stretching head body and an asphalt sample is increased, a certain stress dispersion effect can be achieved in the stretching process, and therefore the testing accuracy and stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of asphalt testing, in particular to a tensile head structure for high-viscosity asphalt viscosity-toughness testing. Background Art

[0002] The asphalt viscosity-toughness test is a typical test for evaluating the modification effect of modified asphalt. It was originally used to evaluate SBS modified asphalt, and later expanded to evaluate high-viscosity modified asphalt for drainage asphalt pavement. Generally, the test temperature is required to be 25°C, the tensile speed is 500mm / min, and the stretching is terminated when it reaches 300mm. During the test, a large load is shown at the beginning, and then there is a longer deformation section. The test can obtain two evaluation parameters: viscosity-toughness and toughness. Among them, viscosity-toughness reflects the maximum tensile deformation capacity of asphalt, and toughness can measure the ability of asphalt to delay damage and resist fracture after tensile yield.

[0003] In the prior art, such as Chinese patent publication No. CN219715152U, a high-viscosity asphalt viscosity and toughness detection device includes a sample container detachably connected to a detector, and also includes: a positioning plate installed on the sample container, wherein a positioning sleeve is fixedly connected to the positioning plate, and a stretching semi-spherical head is slidably connected to the positioning sleeve; the stretching semi-spherical head includes a stretching rod, and a semi-spherical seat is fixedly connected to the bottom of the stretching rod, and an annular groove is provided on the semi-spherical seat, and the axis of the annular groove coincides with the axis of the stretching rod; the utility model can avoid the problem that the adhesion between the asphalt and the semi-spherical seat is destroyed first and the true viscosity and toughness of the asphalt cannot be accurately obtained by providing an annular groove on the semi-spherical seat, thereby expanding the applicability of the viscosity and toughness test to high-viscosity asphalt.

[0004] In the above patent, by providing an annular groove on the hemispherical seat, the adhesion between the asphalt and the hemispherical seat can be prevented from being destroyed first, thereby expanding the applicability of the adhesion-toughness test to high-viscosity asphalt. However, when adjusting the height of the ball head, nuts and stretching rods are used for thread fixing and adjustment. After multiple adjustments, the threads will be worn and damaged, and the components need to be replaced, increasing maintenance costs. Utility Model Content

[0005] The purpose of the present utility model is to solve the problem in the above-mentioned patent that by providing an annular groove on the semi-spherical seat, the adhesion between the asphalt and the semi-spherical seat can be avoided from being destroyed first, thereby expanding the applicability of the viscosity-toughness test to high-viscosity asphalt. However, when adjusting the height of the ball head, a nut and a stretching rod are used for thread fixing and adjustment. After multiple adjustments, the thread will be worn and damaged, and the components need to be replaced, which increases the maintenance cost. A stretching head structure for a high-viscosity asphalt viscosity-toughness test is proposed.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a stretching head structure for high-viscosity asphalt toughness test, comprising: a sample container and a connecting sleeve, a connecting rod is inserted into the inner surface of the connecting sleeve, the bottom of the connecting rod is fixedly connected to the stretching head body, the outer surface of the stretching head body is evenly fixedly connected to a plurality of semi-circular balls, the outer surface of the stretching head body is provided with arc grooves near the positions of the plurality of semi-circular balls, the front surface of the connecting rod is provided with a plurality of adjustment holes, the outer surface of the connecting rod is fixedly connected to an adjustment cylinder near the bottom, the front end face of the adjustment cylinder is movably penetrated by a sliding rod, and the rear end face of the sliding rod is fixedly connected to a limiting rod.

[0007] Preferably, a spring is sleeved on the outer surface of the limiting rod, and the outer surface of the limiting rod and the inner surface of the adjusting cylinder are slidably arranged.

[0008] Preferably, one end of the spring is fixedly connected to an inner wall of one side of the adjusting cylinder, and the other end of the spring is fixedly connected to a front end surface of the limiting rod.

[0009] Preferably, the limiting rod is matched with a plurality of adjustment holes, and the top of the sample container is symmetrically fixedly connected with a positioning rod.

[0010] Preferably, the bottom of the connecting sleeve is fixedly connected to a support frame, and the top of the support frame is provided with a plurality of positioning holes.

[0011] Preferably, the inner surface of the support frame matches the outer surface of the connecting rod, and the plurality of positioning holes are matched with the two positioning rods.

[0012] Preferably, an auxiliary rod is fixedly connected to the outer surface of the connecting rod near the bottom.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are:

[0014] 1. In the present invention, the cooperation of the support frame, the positioning hole and the positioning rod enables the stretching head body to be accurately aligned with the center of the sample container. The cooperation of the spring, the limit rod, the adjustment hole and the sliding rod allows the position of the connecting rod in the connecting sleeve to be adjusted, thereby adjusting the position of the stretching head body. The snap-fit adjustment avoids the problem of threaded connection requiring replacement after repeated use. With the assistance of the semi-circular ball and the arc-shaped groove, the contact area between the stretching head body and the asphalt sample is increased, which can play a certain stress dispersion role during the stretching process, thereby improving the accuracy and stability of the test.

[0015] 2. In the present invention, when adjusting the position of the connecting rod, the connecting rod can be lifted by the auxiliary rod, making it more convenient to adjust the position of the connecting rod in the connecting sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional diagram of a tensile head structure for a high-viscosity asphalt viscosity-toughness test proposed in the utility model;

[0017] Figure 2 This is a partial structural expansion diagram of a tensile head structure for a high-viscosity asphalt viscosity-toughness test proposed in the utility model;

[0018] Figure 3 This is a schematic diagram of the main structure of a stretching head for a high-viscosity asphalt viscosity-toughness test proposed in the utility model;

[0019] Figure 4 This is a partial structural cross-sectional view of a tensile head structure for a high-viscosity asphalt viscosity-toughness test proposed in the utility model;

[0020] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0021] Legend: 1. Sample container; 2. Support frame; 3. Connecting sleeve; 4. Positioning hole; 5. Auxiliary rod; 6. Connecting rod; 7. Positioning rod; 8. Adjustment hole; 9. Stretching head body; 10. Semi-circular ball; 11. Arc groove; 12. Adjustment cylinder; 13. Sliding rod; 14. Spring; 15. Limit rod. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0024] Example 1, as Figure 1-Figure 5As shown, the utility model provides a stretching head structure for high-viscosity asphalt viscosity toughness test, including: a sample container 1 and a connecting sleeve 3, the inner surface of the connecting sleeve 3 is inserted with a connecting rod 6, the bottom of the connecting rod 6 is fixedly connected to a stretching head body 9, the outer surface of the stretching head body 9 is evenly fixedly connected with a plurality of semi-circular balls 10, the outer surface of the stretching head body 9 is provided with arc grooves 11 near the positions of the plurality of semi-circular balls 10, the front surface of the connecting rod 6 is provided with a plurality of adjustment holes 8, the outer surface of the connecting sleeve 3 is fixedly connected with an adjustment cylinder 12 near the bottom, the front end surface of the adjustment cylinder 12 is movably penetrated by a sliding rod 13, and the rear end surface of the sliding rod 13 is fixed There is a limit rod 15 fixedly connected, and the outer surface of the limit rod 15 is sleeved with a spring 14. The outer surface of the limit rod 15 is slidably arranged with the inner surface of the adjusting tube 12. One end of the spring 14 is fixedly connected to the inner wall of one side of the adjusting tube 12, and the other end of the spring 14 is fixedly connected to the front end face of the limit rod 15. The limit rod 15 is matched with multiple adjustment holes 8. The top of the sample container 1 is symmetrically fixedly connected with a positioning rod 7, and the bottom of the connecting sleeve 3 is fixedly connected with a support frame 2. A plurality of positioning holes 4 are opened on the top of the support frame 2. The inner surface of the support frame 2 cooperates with the outer surface of the connecting rod 6, and the plurality of positioning holes 4 are matched with the two positioning rods 7.

[0025] The effect achieved by the entire embodiment 1 is that the asphalt to be tested is placed in the sample container 1, and then the positioning hole 4 on the support frame 2 is aligned with the positioning rod 7, so that the stretching head body 9 can be accurately aligned with the center of the sample container 1 to avoid offset during the stretching process, and then the hook on the connecting sleeve 3 is connected to the detector pull rod hook for testing. Before the test, the sliding rod 13 is pulled outward to drive the limit rod 15 to move outward along the adjustment tube 12, and the spring 14 is compressed at the same time, so that the limit rod 15 is disengaged from the adjustment hole 8, so that the connecting rod 6 can move in the connecting sleeve 3. After the adjustment is completed, the sliding rod 13 is released, and the limit rod 15 is driven to move backward under the restoring force of the spring 14. The limiting rod 15 is inserted into the corresponding adjustment hole 8 and engaged to complete the fixation of the connecting rod 6. After the limiting rod 15 is inserted into different adjustment holes 8, the position of the stretching head body 9 is adjusted so that the top plane of the stretching head body 9 is flush with or slightly submerged in the upper surface of the asphalt sample. During the stretching test, with the assistance of the arc groove 11 and the semicircular ball 10 on the outside of the stretching head body 9, the contact area between the stretching head body 9 and the asphalt sample is increased, and the adhesion between the asphalt sample and the stretching head body 9 is enhanced, which helps to prevent the sample from falling off from the stretching head body 9 during the stretching process. The design of the arc groove 11 can play a certain stress dispersion role during the stretching process, thereby improving the accuracy of the test.

[0026] Example 2, as Figure 1-Figure 5As shown, the auxiliary rod 5 is fixedly connected to the outer surface of the connecting rod 6 near the bottom.

[0027] The effect achieved by the entire embodiment 2 is that, through the setting of the auxiliary rod 5, when adjusting the position of the connecting rod 6, the connecting rod 6 can be lifted by the auxiliary rod 5, making it more convenient to adjust the position of the connecting rod 6 in the connecting sleeve 3.

[0028] Working principle: Place the asphalt to be tested in the sample container 1, and then align the positioning hole 4 on the support frame 2 with the positioning rod 7 so that the stretching head body 9 can be accurately aligned with the center of the sample container 1 to avoid offset during the stretching process, and then connect the hook on the connecting sleeve 3 to the detector pull rod hook for testing. Before testing, pull the sliding rod 13 outward to drive the limit rod 15 to move outward along the adjustment tube 12, and compress the spring 14 to disengage the limit rod 15 from the adjustment hole 8, so that the connecting rod 6 can be moved in the connecting sleeve 3 through the auxiliary rod 5. After the adjustment is completed, release the sliding rod 13, and under the restoring force of the spring 14, drive the limit rod 15 to move backward. The limiting rod 15 is inserted into the corresponding adjustment hole 8 and engaged to complete the fixation of the connecting rod 6. After the limiting rod 15 is inserted into different adjustment holes 8, the position of the stretching head body 9 is adjusted so that the top plane of the stretching head body 9 is flush with or slightly submerged in the upper surface of the asphalt sample. During the stretching test, with the assistance of the arc groove 11 and the semicircular ball 10 on the outside of the stretching head body 9, the contact area between the stretching head body 9 and the asphalt sample is increased, and the adhesion between the asphalt sample and the stretching head body 9 is enhanced, which helps to prevent the sample from falling off from the stretching head body 9 during the stretching process. The design of the arc groove 11 can play a certain stress dispersion role during the stretching process, thereby improving the accuracy of the test.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A tensile head structure for high-viscosity asphalt viscosity-toughness testing, characterized in that: include: A sample container (1) and a connecting sleeve (3), wherein a connecting rod (6) is inserted into the inner surface of the connecting sleeve (3), a stretching head body (9) is fixedly connected to the bottom of the connecting rod (6), a plurality of semicircular balls (10) are evenly fixedly connected to the outer surface of the stretching head body (9), arc grooves (11) are provided on the outer surface of the stretching head body (9) near the positions of the plurality of semicircular balls (10), a plurality of adjustment holes (8) are provided on the front surface of the connecting rod (6), an adjustment cylinder (12) is fixedly connected to the outer surface of the connecting sleeve (3) near the bottom, a sliding rod (13) is movably passed through the front end surface of the adjusting cylinder (12), and a limiting rod (15) is fixedly connected to the rear end surface of the sliding rod (13).

2. The tensile head structure for high-viscosity asphalt viscosity-toughness testing according to claim 1, characterized in that: The outer surface of the limiting rod (15) is sleeved with a spring (14), and the outer surface of the limiting rod (15) and the inner surface of the regulating cylinder (12) are slidably arranged.

3. The tensile head structure for high-viscosity asphalt viscosity-toughness testing according to claim 2, characterized in that: One end of the spring (14) is fixedly connected to an inner wall of one side of the regulating cylinder (12), and the other end of the spring (14) is fixedly connected to the front end surface of the limiting rod (15).

4. The tensile head structure for high-viscosity asphalt viscosity-toughness testing according to claim 3, characterized in that: The limiting rod (15) is matched with a plurality of adjustment holes (8), and the top of the sample container (1) is symmetrically fixedly connected with a positioning rod (7).

5. The tensile head structure for high-viscosity asphalt viscosity-toughness testing according to claim 4, characterized in that: The bottom of the connecting sleeve (3) is fixedly connected to a support frame (2), and a plurality of positioning holes (4) are provided on the top of the support frame (2).

6. The tensile head structure for high-viscosity asphalt viscosity-toughness testing according to claim 5, characterized in that: The inner surface of the support frame (2) matches the outer surface of the connecting rod (6), and the plurality of positioning holes (4) and the two positioning rods (7) are arranged in a matching manner.

7. The tensile head structure for high-viscosity asphalt viscosity-toughness testing according to claim 6, characterized in that: An auxiliary rod (5) is fixedly connected to the outer surface of the connecting rod (6) near the bottom.

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