An asphalt pavement torsion-shear testing device

Abstract

This utility model discloses an asphalt pavement torsion-shear testing device, relating to the field of asphalt pavement technology. The device includes a base, with a placement platform fixedly connected to the top. A detection anti-displacement component is located at the bottom of the base. The detection anti-displacement component includes a motor, the top of which is fixedly connected to the bottom of the base. A bidirectional lead screw is fixedly connected to the output shaft of the motor. Through the cooperation between the motor, the bidirectional lead screw, and other components within the detection anti-displacement component, this utility model achieves uniform pressure application to both sides of the asphalt material via the design of the bidirectional lead screw and two clamping plates. Uniform pressure application helps ensure consistency and reliability during the testing process, avoiding errors caused by uneven pressure. It allows precise control of the movement of the extrusion rod, compressing the end face of the asphalt material, enabling accurate measurement of the material's torque response.

Description

Technical Field

[0001] This utility model belongs to the field of asphalt pavement technology, and in particular relates to an asphalt pavement torsion and shear detection device. Background Technology

[0002] The asphalt pavement torsion-shear testing device is mainly used to detect the torsional-shear stress that asphalt mixtures may encounter during road use, in order to assess the pavement's resistance to deformation and durability. By simulating torsional-shear deformation under actual traffic loads, the device provides reliable mechanical parameters to help optimize pavement design.

[0003] According to a published disclosure (Publication No.: CN 217738892 U), a torsion-shear testing device for asphalt pavement includes a fixed frame, a handwheel, a torque multiplier, a first flange, and a main shaft. The torque multiplier is installed on the top surface of the fixed frame, the input shaft of the torque multiplier is connected to the handwheel, and the output shaft of the torque multiplier is connected to the main shaft. The first flange is installed at the bottom of the main shaft. The first flange is used to connect a torsion-shear testing mechanism, which rotates synchronously with the main shaft. The torsion-shear testing mechanism is used to test the torsion-shear strength between pavement structural layers.

[0004] In the aforementioned application, the cooperation between components such as the fixing frame, handwheel, and torque multiplier makes it difficult to solve the problem of uniformly applying pressure to both sides of the asphalt material. This makes it difficult to ensure consistency and reliability during the testing process, and the test results are affected by uneven pressure, resulting in errors. Improvements are needed. Utility Model Content

[0005] The purpose of this invention is to provide an asphalt pavement torsion shear detection device, which solves the problem of not being able to apply pressure evenly to both sides of the asphalt material by detecting the interaction between components such as the motor and the bidirectional lead screw inside the anti-displacement component.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to an asphalt pavement torsion-shear testing device, comprising a base, a placement platform fixedly connected to the top of the base, and a detection anti-displacement component disposed at the bottom of the base. The detection anti-displacement component includes a first motor, the top of which is fixedly connected to the bottom of the base. A bidirectional lead screw is fixedly connected to the output shaft of the first motor, and a threaded sleeve is threaded onto the circumferential surface of the bidirectional lead screw. A limit rod is fixedly connected to the side of the first motor, with one end of the limit rod away from the first motor penetrating through the side of the threaded sleeve. A clamping plate is fixedly connected to the top of the placement platform. A horizontal plate is fixedly connected to the top of the horizontal plate, and a rack is slidably connected to the top of the horizontal plate. A second motor is fixedly connected to the top of the horizontal plate, and a gear is fixedly connected to the output shaft of the second motor. A compression rod is fixedly connected to one end of the rack. A torque sensor is disposed at the top of the base.

[0007] Furthermore, the gear and rack mesh with each other, the compression rod is located on the side of the placement platform, and the torque sensor is located on the side of the placement platform. This design is beneficial for driving the rack to move when the gear moves.

[0008] Furthermore, there are two threaded sleeves and clamps, which are symmetrical to each other along the vertical central axis of the placement platform. The placement platform is located on the displacement trajectory of the clamps. This design is beneficial for clamping the circular asphalt material located in the placement platform when the clamps move.

[0009] Furthermore, the placement platform is circular, and the bidirectional lead screw is located at the bottom of the base and the placement platform. The placement platform is located on the displacement trajectory of the extrusion rod. This design helps to avoid affecting the normal rotation of the bidirectional lead screw.

[0010] Furthermore, a heat dissipation assembly is provided on the top of the base. The heat dissipation assembly includes a support rod, one end of which is fixedly connected to the top of the base. A rotating shaft is rotatably connected to one end of the support rod. Blades are fixedly connected to the circumferential surface of the rotating shaft. A support rod is fixedly connected to the circumferential surface of the rotating shaft. An actuating rod is fixedly connected to the top of the clamping plate. By blowing air onto the placement platform, the temperature of the asphalt material under torsional shear deformation is reduced.

[0011] Furthermore, the support rod is located on the displacement trajectory of the trigger rod, the blade is located on the top of the placement platform, and several blades are arranged in a circumferential array on the circumferential surface of the rotating shaft. This design is beneficial for improving wind power.

[0012] Furthermore, a torsion spring is fixedly connected to the circumferential surface of the rotating shaft, and the end of the torsion spring away from the rotating shaft is fixedly connected to one end of the support rod. The design of the torsion spring is beneficial to the automatic reset of the rotating shaft when it is not driven.

[0013] This utility model has the following beneficial effects: 1. This utility model detects the interaction between components such as the motor and the bidirectional lead screw inside the anti-displacement component. It achieves uniform pressure application on both sides of the asphalt material through the design of the bidirectional lead screw and two clamping plates. Uniform pressure application helps to ensure consistency and reliability in the testing process, avoids errors caused by uneven pressure in the test results, and can precisely control the movement of the extrusion rod to extrude the end face of the asphalt material, so that the test can accurately measure the torque response of the material.

[0014] 2. This utility model achieves this by cooperating with the support rods, rotating shafts and other components inside the heat dissipation assembly. When the blades rotate, the wind force generated blows to the top of the asphalt material, reducing the temperature of the asphalt material. By generating wind force to reduce the temperature of the asphalt material, the material can be kept in a relatively stable state, ensuring the stability of the material's physical properties during the test, thereby improving the reliability of the test and making the test results more accurate.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional appearance structure diagram of the present utility model; Figure 2 This utility model Figure 1 A three-dimensional magnified structural diagram of A in the middle; Figure 3 This is a three-dimensional bottom view of the bidirectional lead screw structure of this utility model; Figure 4 This is a three-dimensional top view of the placement platform of this utility model; Figure 5 This is a three-dimensional magnified structural diagram of the blade of this utility model.

[0018] The attached diagram lists the components represented by each number as follows: 1. Base; 2. Placement platform; 3. Detection and anti-displacement component; 31. Motor 1; 32. Two-way lead screw; 33. Threaded sleeve; 34. Limiting rod; 35. Clamping plate; 37. Horizontal plate; 38. Rack; 39. Motor 2; 310. Gear; 311. Pressing rod; 312. Torque sensor; 4. Heat dissipation component; 41. Support rod; 42. Rotating shaft; 43. Blade; 44. Support rod; 45. Actuating rod; 46. Torsion spring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-5 This utility model is an asphalt pavement torsion and shear testing device, including a base 1, a placement platform 2 fixedly connected to the top of the base 1, and a detection and anti-displacement component 3 provided at the bottom of the base 1. The detection and anti-displacement component 3 includes a motor 31, the top of which is fixedly connected to the bottom of the base 1. A bidirectional lead screw 32 is fixedly connected to the output shaft of the motor 31. A threaded sleeve 33 is threadedly connected to the circumferential surface of the bidirectional lead screw 32. A limit rod 34 is fixedly connected to the side of the motor 31. The end of the limit rod 34 away from the motor 31 passes through the side of the threaded sleeve 33. A clamping plate 35 is fixedly connected to the top of the threaded sleeve 33. A horizontal plate 37 is fixedly connected to the top of the placement platform 2. A rack 38 is slidably connected to the top of the horizontal plate 37. A second motor 39 is fixedly connected to the top of the horizontal plate 37. A gear 310 is fixedly connected to the output shaft of the second motor 39. A pressing rod 311 is fixedly connected to one end of the rack 38. A torque sensor 312 is provided at the top of the base 1.

[0021] The gear 310 and rack 38 mesh with each other, the compression rod 311 is located on the side of the placement platform 2, and the torque sensor 312 is located on the side of the placement platform 2. This design is beneficial for driving the rack 38 to move when the gear 310 moves.

[0022] There are two threaded sleeves 33 and clamping plates 35, which are symmetrical to each other along the vertical central axis of the placement platform 2. The placement platform 2 is located on the displacement trajectory of the clamping plate 35. This design is beneficial to clamp the round asphalt material located in the placement platform 2 when the clamping plate 35 moves.

[0023] The placement platform 2 is set in a circular shape, and the bidirectional lead screw 32 is located at the bottom of the base 1 and the placement platform 2. The placement platform 2 is located on the displacement trajectory of the extrusion rod 311. This design is beneficial to avoid affecting the normal rotation of the bidirectional lead screw 32.

[0024] A heat dissipation assembly 4 is provided on the top of the base 1. The heat dissipation assembly 4 includes a support rod 41. One end of the support rod 41 is fixedly connected to the top of the base 1. A rotating shaft 42 is rotatably connected to the other end of the support rod 41. A blade 43 is fixedly connected to the circumferential surface of the rotating shaft 42. A support rod 44 is fixedly connected to the circumferential surface of the rotating shaft 42. An actuating rod 45 is fixedly connected to the top of the clamping plate 35. By blowing air onto the placement platform 2, the temperature of the asphalt material under torsional shear deformation is reduced.

[0025] The support rod 44 is located on the displacement trajectory of the trigger rod 45, and the blade 43 is located on the top of the placement platform 2. Several blades 43 are arranged and are arranged in a circular array on the circumferential surface of the rotating shaft 42. This design is beneficial to improving wind power.

[0026] A torsion spring 46 is fixedly connected to the circumferential surface of the rotating shaft 42. The end of the torsion spring 46 away from the rotating shaft 42 is fixedly connected to one end of the support rod 41. The design of the torsion spring 46 is conducive to the automatic reset of the rotating shaft 42 when it is not driven.

[0027] A specific application of this embodiment is as follows: A sample, typically a disc-shaped asphalt mixture with a diameter of 150mm or 100mm and a thickness of 50mm, is placed in the placement platform 2. Motor 1 31 is started and rotated forward. The forward rotation of motor 1 31 drives the bidirectional lead screw 32 to move relative to each other. This relative movement of the bidirectional lead screw 32 drives the two threaded sleeves 33 and the two clamping plates 35 to move relative to each other. The two clamping plates 35 are located within the placement platform 2. When the two clamping plates 35 move relative to each other, they move towards the center of the placement platform 2. At this time, the asphalt material is placed within the placement platform 2. When the two clamping plates 35 move relative to each other, they apply pressure evenly to both sides of the asphalt material, clamping and limiting its position. Simultaneously, motor 2 39 is started, driving gear 310 to rotate. The gear 310 and rack 38 mesh with each other. When the gear 310 rotates, it drives the rack 38 to move, causing the rack 38 to move the extrusion rod 311 closer to the asphalt material, extruding one end of the asphalt material and testing the torque of the asphalt material. The torque of the asphalt material is detected by the torque sensor 312. Through the design of the bidirectional lead screw 32 and the two clamping plates 35, pressure can be applied evenly to both sides of the asphalt material. This uniform pressure application helps to ensure the consistency and reliability of the test process, avoiding errors caused by uneven pressure. The movement of the extrusion rod 311 can be precisely controlled to extrude the end face of the asphalt material. This control method enables the test to accurately measure the torque response of the material, ensuring the repeatability and reliability of the test.

[0028] The relative movement of the two clamping plates 35 causes the trigger rod 45 to move closer to the placement platform 2. The support rod 44 is located on the movement trajectory of the trigger rod 45. When the trigger rod 45 moves, it squeezes the support rod 44, causing it to displace. This displacement causes the rotating shaft 42 and the blade 43 to rotate. The rotation of the blade 43 generates wind. The blade 43 is located at the top of the placement platform 2. The wind generated by the rotation of the blade 43 blows onto the top of the asphalt material, reducing its temperature. Asphalt material is prone to softening at high temperatures, which may affect the accuracy of road surface testing. By generating wind and reducing the temperature of the asphalt material, the material can be kept in a relatively stable state, ensuring the stability of the material's physical properties during the test, thereby improving the reliability of the test and making the test results more accurate.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A device for torsional shear testing of asphalt pavement comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to a placement platform (2), and the bottom of the base (1) is provided with a detection anti-displacement component (3). The detection anti-displacement component (3) includes a motor (31), the top of which is fixedly connected to the bottom of the base (1). A two-way lead screw (32) is fixedly connected to the output shaft of the motor (31). A threaded sleeve (33) is threadedly connected to the circumferential surface of the two-way lead screw (32). A limit rod (34) is fixedly connected to the side of the motor (31). The end of the limit rod (34) away from the motor (31) passes through the side of the threaded sleeve (33). A clamping plate (35) is fixedly connected to the top of the threaded sleeve (33). A horizontal plate (37) is fixedly connected to the top of the placement platform (2). A rack (38) is slidably connected to the top of the horizontal plate (37). A motor (39) is fixedly connected to the top of the horizontal plate (37). A gear (310) is fixedly connected to the output shaft of the motor (39). A pressing rod (311) is fixedly connected to one end of the rack (38). A torque sensor (312) is provided on the top of the base (1).

2. The asphalt pavement torsion shear detection device according to claim 1, characterized in that, The gear (310) and rack (38) mesh with each other, the extrusion rod (311) is located on the side of the placement platform (2), and the torque sensor (312) is located on the side of the placement platform (2).

3. The asphalt pavement torsion shear detection device according to claim 1, characterized in that, Two threaded sleeves (33) and clamping plates (35) are provided and are symmetrical to each other along the vertical central axis of the placement platform (2). The placement platform (2) is located on the displacement trajectory of the clamping plate (35).

4. The asphalt pavement torsion-shear testing device according to claim 1, characterized in that, The placement platform (2) is circular in shape, the bidirectional lead screw (32) is located at the bottom of the base (1) and the placement platform (2), and the placement platform (2) is located on the displacement trajectory of the extrusion rod (311).

5. The asphalt pavement torsion-shear testing device according to claim 1, characterized in that, The top of the base (1) is provided with a heat dissipation assembly (4), which includes a support rod (41). One end of the support rod (41) is fixedly connected to the top of the base (1), and one end of the support rod (41) is rotatably connected to a rotating shaft (42). A blade (43) is fixedly connected to the circumferential surface of the rotating shaft (42), and a support rod (44) is fixedly connected to the circumferential surface of the rotating shaft (42). An actuating rod (45) is fixedly connected to the top of the clamping plate (35).

6. The asphalt pavement torsion-shear testing device according to claim 5, characterized in that, The support rod (44) is located on the displacement trajectory of the trigger rod (45), the blade (43) is located on the top of the placement platform (2), and there are several blades (43) arranged in a circumferential array on the circumferential surface of the rotating shaft (42).

7. The asphalt pavement torsion-shear testing device according to claim 5, characterized in that, A torsion spring (46) is fixedly connected to the circumferential surface of the rotating shaft (42), and the end of the torsion spring (46) away from the rotating shaft (42) is fixedly connected to one end of the support rod (41).

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