Asphalt concrete shear strength testing device and method

Abstract

The present invention discloses an asphalt concrete shear strength testing device and method, which relates to the technical field of asphalt concrete shear strength testing, including a pressure rod type jack, a guide frame is provided on the upper part of the pressure rod type jack, two movable brackets are symmetrically provided and slidingly provided on the guide frame, a pressure display assembly is fixedly provided at a position below the guide frame near the movable bracket, and shearing and pressing molds are installed on the two movable brackets, and the movable brackets include a movable plate, a support block is provided at the middle position of the side wall of the movable plate, and a curved groove is provided on the side of the support block away from the movable plate, and an angle adjustment seat is slidingly provided in the curved groove, and a curved structure adapted to the curved groove is provided on the angle adjustment seat. The present invention can realize the synchronous approach and separation of the two movable brackets during the operation of the pressure rod type jack, and can quickly perform a pressure test on the sample, and the operation is simple, and it is convenient to synchronously and quickly adjust the angles of the lower template and the upper template.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt concrete shear strength detection technology, and in particular to an asphalt concrete shear strength detection device and method. Background Art

[0002] The shear strength of asphalt concrete refers to the maximum shear stress that asphalt concrete can withstand when subjected to shear force. The shear strength of asphalt concrete is related to its mix ratio, asphalt content, aggregate properties and aggregate distribution. The shear strength of asphalt concrete can be tested by experimental methods. Common experimental methods include direct shear test and ring shear test. The direct shear test is to cut the asphalt concrete sample into a direct shear specimen and apply shear force to measure its shear strength. The ring shear test is to make the asphalt concrete sample into a ring specimen and apply shear force to measure its shear strength. The shear strength of asphalt concrete is related to its use. Generally speaking, the shear strength of road asphalt concrete should meet the corresponding design requirements to ensure the bearing capacity and durability of the road. The shear strength indicators of asphalt concrete commonly used in engineering include shear strength and shear modulus. The shear strength of asphalt concrete can be improved by changing the mix ratio, asphalt content and aggregate properties. Appropriate adjustment of these parameters can improve the shear strength of asphalt concrete, thereby improving its performance and durability.

[0003] Most of the existing asphalt concrete shear strength testing equipment can only perform shear tests in the horizontal direction, which is inconvenient to adjust. In addition, during the test, the mold moves unilaterally, which makes adjustment troublesome. Therefore, an asphalt concrete shear strength testing equipment and method are proposed. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes an asphalt concrete shear strength testing device and method.

[0005] The present invention provides an asphalt concrete shear strength testing device, comprising a pressure rod type jack, a guide frame is provided on the upper part of the pressure rod type jack, two movable brackets are symmetrically provided on the guide frame for sliding, a pressure display component is fixedly provided at a position below the movable bracket on the guide frame, and shearing and pressing molds are installed on the two movable brackets;

[0006] The movable bracket includes a movable plate, a support block is arranged at the middle position of the side wall of the movable plate, a curved groove is arranged on the side of the support block away from the movable plate, an angle adjustment seat is slidably arranged in the curved groove, a curved structure adapted to the curved groove is arranged on the angle adjustment seat, an arc-shaped slider is arranged on the curved surface of the angle adjustment seat, and arc-shaped protrusions are arranged on both sides of the arc-shaped slider, a first curved slideway connected to the curved groove is arranged on the support block, the first curved slideway is adapted to the curved slideway, and the two sides of the first curved slideway are divided into A second arc-shaped slideway is separately provided to match the two arc-shaped protrusions, a circular groove is provided at the middle position below one side of the support block along the width direction of the support block, the circular groove is connected with the second arc-shaped slideway, a clamping assembly for clamping the arc-shaped slider is provided in the circular groove, a linkage bracket assembly for realizing the synchronous approach or separation of the two movable brackets is provided between the two movable brackets, a pressure sensor is fixedly installed between the telescopic end of the pressure rod type jack and the movable plate located below, and the pressure sensor is electrically connected to the pressure display assembly.

[0007] As a further optimization of the technical solution, the present invention provides an asphalt concrete shear strength testing device, wherein the shear-compression mold comprises an upper template and a lower template that are relatively arranged, and shear-compression teeth are arranged on the opposite sides of the lower template and the upper template, and the upper template and the lower template are respectively fixedly connected to two angle adjustment seats.

[0008] As a further optimization of the technical solution, the present invention provides an asphalt concrete shear strength testing device, wherein the guide frame includes a top plate, and vertically arranged metal optical axes are fixedly arranged on both sides of the top plate, side support arms are arranged on the upper parts of both sides of the pressure rod type jack, and the two side support arms are respectively fixedly connected to the lower ends of the two metal optical axes, and a base is arranged below the pressure rod type jack.

[0009] As a further optimization of the technical solution, the present invention provides an asphalt concrete shear strength testing device, wherein guide holes are provided on both sides of the movable plate, the two metal optical axes pass through the two guide holes respectively, optical axis sleeves are provided in the two guide holes, and the movable plate forms a sliding fit with the metal optical axis through the optical axis sleeves.

[0010] As a further optimization of the technical solution, the present invention provides an asphalt concrete shear strength testing device, the pressure display assembly includes a measuring instrument bracket, second guide sleeves are fixed on both sides of the measuring instrument bracket, a sloped portion is provided on one side of the measuring instrument bracket, and a measuring instrument is fixed on the sloped portion, the measuring instrument is connected to a pressure sensor, two of the second guide sleeves are respectively mounted on two metal optical axes, and the two second guide sleeves are fixedly connected to the metal optical axes by fastening bolts.

[0011] In this preferred embodiment, the measuring instrument is a pressure measuring instrument with a screen, which is used in conjunction with a pressure sensor to perform pressure testing. It can provide feedback on the pressure of the shear-compression asphalt concrete specimen and observe the pressure when the asphalt concrete specimen is damaged by shear compression, thereby obtaining shear resistance data.

[0012] As a further optimization of the technical solution, the present invention provides an asphalt concrete shear strength testing device, wherein the clamping assembly includes a horizontal axis, and both ends of the horizontal axis are sleeved with round sleeves, the two round sleeves are respectively inserted into the two ends of two circular through grooves, and a spring is sleeved on the outer wall of the horizontal axis near the position between the two round sleeves, and the two round sleeves are provided with positioning teeth at opposite ends, and both sides of the arc-shaped protrusion are provided with positioning tooth grooves distributed at equal distances, and the positioning tooth grooves are adapted to the arc-shaped protrusions, and guide grooves are provided on the inner sides of the two round sleeves, and two convex pins are provided on the outer side of the horizontal axis, and the two convex pins are respectively slidably set in the two guide grooves, and the guide grooves include a straight groove portion and an oblique groove portion, the oblique groove portion is connected to the straight groove portion, and the oblique groove portion is arranged obliquely to one side of the spring.

[0013] In this preferred embodiment, when the horizontal axis rotates, the protruding pin is driven to fall into the straight groove portion of the guide groove, so that the two circular sleeves are brought closer to each other, thereby cooperating with the two positioning teeth and the arc-shaped protrusion on the arc-shaped slider to clamp the arc-shaped slider in place.

[0014] As a further optimization of the technical solution, the present invention provides an asphalt concrete shear strength testing device, wherein the side wall of the circular sleeve is provided with a guide protrusion along its length direction, the inner wall of the circular through groove is provided with a guide groove matched with the guide protrusion, and the guide protrusion is slidably arranged in the guide groove.

[0015] As a further optimization of the technical solution, the present invention provides an asphalt concrete shear strength testing device, wherein the linkage bracket assembly includes a bow-shaped bracket, both ends of the bow-shaped bracket are provided with a first guide sleeve, and the two first guide sleeves are respectively sleeved on two metal optical axes, a rotating shaft is provided on the side of the bow-shaped bracket close to the movable bracket, and a linkage arm is rotatably provided on the rotating shaft, both ends of the linkage arm are rotatably connected with the rotating arms, and the two rotating arms are fixedly connected to the ends of the two horizontal axes at one end away from the linkage arm, a rotating sleeve is penetrated at the middle position of the linkage arm, and the rotating sleeve forms a rotational fit with the rotating shaft.

[0016] In this preferred scheme, a linkage bracket assembly is set up. When the pressure rod jack pushes one of the lower movable brackets to move upward, the other movable bracket moves downward synchronously during the upward movement due to the setting of the bow bracket, linkage arm and rotating arm. The two movable brackets move closer to each other. When the two movable brackets are close to a certain distance, the convex pins slide in the straight groove part of the guide groove. When the two movable brackets are close to a certain distance, the two convex pins slide into the oblique groove part of the guide groove, driving the two circular sleeves away from each other, thereby realizing the separation of the positioning teeth and the positioning teeth on the arc-shaped slider. At this time, the angle adjustment seat can be rotated to adjust the setting angle of the shearing mold, so that shear tests at different angles can be carried out.

[0017] As a further optimization of the technical solution, an asphalt concrete shear strength testing device of the present invention also includes an angle detection block arranged between the lower template and the upper template, a handrail rod is arranged on one side of the angle detection block, and tooth grooves matching the shear teeth are arranged on the sides of the angle detection block close to the lower template and the upper template, an electronic angle meter is embedded in the middle position of the angle detection block close to the handrail rod, and the sum of the vertical distance from the vertex of the arc surface of the angle adjustment seat to the horizontal plane of the angle adjustment seat, the thickness of the lower template, the thickness of the upper template and the thickness of the angle detection block is equal to the diameter of the corresponding circle of the arc surface of the angle adjustment seat.

[0018] A method for using an asphalt concrete shear strength testing device comprises the following steps:

[0019] Sample testing: Control the compression rod jack to retract, so that there is a distance between the lower template and the upper template for the test block to fit, and then place the test block. Then control the compression rod jack to extend, cooperate with the linkage bracket assembly to achieve the synchronous closeness of the two movable brackets, cooperate with the shearing teeth on the lower template and the upper template to apply pressure to the test block, and observe the pressure data displayed on the pressure display assembly when the sample is damaged;

[0020] Angle adjustment, place the angle detection block between the lower template and the upper template, and align the shearing teeth with the corresponding tooth grooves. During the process, the rotating arm drives the horizontal axis to rotate. When the angle detection block is just clamped, the convex pin falls into the oblique groove part of the guide groove, so that the two circular sleeves move away from each other, releasing the restriction on the movement of the arc slider, and the axis centers corresponding to the arc surfaces of the two angle adjustment seats coincide at this time. Then, the angle detection block can be rotated to adjust the angles of the two angle adjustment seats at the same time. After reaching the appropriate angle, the pressure rod jack is controlled to contract, and the convex pin slides along the oblique groove part of the guide groove into the straight groove part. The two circular sleeves are close to each other, and the positioning tooth grooves and convex pins are set to clamp the arc slider to limit its rotation, so that the lower template and the upper template on the angle adjustment seat maintain a certain angle.

[0021] In summary, the beneficial effects of the present invention are:

[0022] In conjunction with the set linkage bracket assembly, the two movable brackets can be synchronously moved closer and farther away during the operation of the pressure rod jack, and the sample can be quickly pressurized for testing. The operation is simple. At the same time, in conjunction with the set clamping assembly and the angle adjustment seat, the angle between the lower template and the upper template can be adjusted, and the shear strength test can be carried out at different angles. At the same time, in conjunction with the linkage bracket assembly and the angle detection block, the arc slider can be unlocked when the two movable brackets are close to a certain distance, so that the angle of the lower template and the upper template can be adjusted synchronously and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of an asphalt concrete shear strength testing device proposed by the present invention;

[0024] Figure 2 A schematic diagram of the structure of the compression rod jack and the guide frame proposed by the present invention;

[0025] Figure 3 A schematic diagram of the structure of the movable bracket and the linkage bracket assembly proposed by the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the pressure display assembly proposed by the present invention;

[0027] Figure 5 It is a structural schematic diagram of the shearing and pressing die proposed by the present invention;

[0028] Figure 6 A schematic diagram of the structure of the movable bracket proposed by the present invention;

[0029] Figure 7 A schematic diagram of the structure of the movable plate proposed by the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the angle adjustment seat proposed by the present invention;

[0031] Fig. 9 It is a structural schematic diagram of the linkage bracket assembly proposed by the present invention;

[0032] Fig.10 A schematic diagram of the structure of the clamping assembly proposed by the present invention;

[0033] Fig.11 It is a structural schematic diagram of the horizontal axis proposed by the present invention;

[0034] Fig.12 It is a structural schematic diagram of the circular sleeve proposed by the present invention;

[0035] Fig.13 This is a schematic diagram of the two-dimensional development structure of the guide groove proposed by the present invention;

[0036] Fig.14 This is a structural schematic diagram of an installation angle detection block of an asphalt concrete shear strength detection device proposed by the present invention;

[0037] Fig.15 This is a schematic diagram of the structure of the angle detection block proposed by the present invention;

[0038] Fig.16 This is a schematic structural diagram of the angle adjustment seat proposed by the present invention after being rotated to a certain angle.

[0039] In the figure: 1, compression rod jack; 101, base; 102, side support arm; 2, guide frame; 201, metal optical axis; 202, top plate; 3, movable bracket; 301, movable plate; 3011, guide hole; 302, support block; 3021, arc groove; 3022, first arc slide; 3023, second arc slide; 3024, circular through groove; 30241, guide groove; 303, clamping assembly; 3031, round sleeve; 30311, positioning teeth; 30312, guide protrusion; 3032, spring; 3033, horizontal axis; 30331, convex pin; 30333, guide groove; 30 4. Angle adjustment seat; 3041. Arc-shaped protrusion; 3042. Arc-shaped slider; 30421. Positioning tooth groove; 4. Linkage bracket assembly; 401. Bow-shaped bracket; 4011. First guide sleeve; 402. Linkage arm; 4021. Rotating sleeve; 403. Rotating arm; 4042. Rotating axis; 5. Pressure display assembly; 501. Measuring instrument bracket; 5011. Second guide sleeve; 502. Measuring instrument; 6. Pressure sensor; 7. Shearing and pressing mold; 701. Lower mold plate; 702. Upper mold plate; 703. Shearing and pressing teeth; 8. Angle detection block; 801. Handrail; 802. Electronic angle meter; 803. Tooth groove. DETAILED DESCRIPTION

[0040] The following will be combined with the attached embodiment of the present invention Figure 1-Figure 16 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See attached Figure 1 To Attachment Fig.16 , an asphalt concrete shear strength testing device, comprising a pressure rod type jack 1, a guide frame 2 is arranged on the upper part of the pressure rod type jack 1, two movable brackets 3 are symmetrically arranged on the sliding arrangement of the guide frame 2, a pressure display component 5 is fixedly arranged at a position below the movable bracket 3 of the guide frame 2, and a shearing mold 7 is installed on the two movable brackets 3;

[0042] The movable bracket 3 includes a movable plate 301, a support block 302 is arranged at the middle position of the side wall of the movable plate 301, a curved groove 3021 is arranged on the side of the support block 302 away from the movable plate 301, an angle adjustment seat 304 is slidably arranged in the curved groove 3021, and a curved surface structure adapted to the curved groove 3021 is arranged on the angle adjustment seat 304, a curved slider 3042 is arranged on the curved surface of the angle adjustment seat 304, and curved protrusions 3041 are arranged on both sides of the curved slider 3042, a first curved slide 3022 connected to the curved groove 3021 is arranged on the support block 302, the first curved slide 3022 is adapted to the curved slider 3042, and the first A second arc slide 3023 matched with the two arc protrusions 3041 is respectively arranged on both sides of the arc slide 3022, and a circular groove 3024 is arranged at the middle position below one side of the support block 302 along the width direction of the support block 302, and the circular groove 3024 is connected with the second arc slide 3023. A clamping assembly 303 for clamping the arc slider 3042 is arranged in the circular groove 3024, and a linkage bracket assembly 4 for realizing the synchronous approach or separation of the two movable brackets 3 is arranged between the two movable brackets 3, and a pressure sensor 6 is fixedly installed between the telescopic end of the pressure rod type jack 1 and the movable plate 301 located below, and the pressure sensor 6 is electrically connected to the pressure display assembly 5.

[0043] See attached Figure 1 , Attachment Figure 3 and attached Figure 5 The shearing and pressing mold 7 includes an upper mold plate 702 and a lower mold plate 701 that are arranged opposite to each other, and shearing and pressing teeth 703 are arranged on opposite sides of the lower mold plate 701 and the upper mold plate 702, and the upper mold plate 702 and the lower mold plate 701 are fixedly connected to two angle adjustment seats 304 respectively.

[0044] See attached Figure 1 and attached Figure 2 The guide frame 2 includes a top plate 202, and vertically arranged metal optical axes 201 are fixedly arranged on both sides of the top plate 202. Side support arms 102 are arranged on the upper parts of both sides of the pressure rod type jack 1, and the two side support arms 102 are respectively fixedly connected to the lower ends of the two metal optical axes 201, and a base 101 is arranged below the pressure rod type jack 1.

[0045] See attached Figure 1 , Attachment Figure 2 and attached Figure 7Guide holes 3011 are provided on both sides of the movable plate 301, and the two metal optical axes 201 pass through the two guide holes 3011 respectively. Optical axis sleeves are provided in the two guide holes 3011, and the movable plate 301 forms a sliding fit with the metal optical axis 201 through the optical axis sleeves.

[0046] See attached Figure 1 and attached Figure 4 The pressure display assembly 5 includes a measuring instrument bracket 501, and second guide sleeves 5011 are fixed on both sides of the measuring instrument bracket 501. A sloped portion is provided on one side of the measuring instrument bracket 501, and a measuring instrument 502 is fixed on the sloped portion. The measuring instrument 502 is connected to the pressure sensor 6. The two second guide sleeves 5011 are respectively sleeved on the two metal optical axes 201, and the two second guide sleeves 5011 are fixedly connected to the metal optical axes 201 by fastening bolts. The measuring instrument 502 here is a pressure measuring instrument with a screen, which is used in conjunction with the pressure sensor 6 to perform pressure testing. It can feedback the pressure condition of the shear compression asphalt concrete specimen block, observe the pressure when the asphalt concrete specimen block is damaged by shear compression, and thus obtain shear resistance data.

[0047] See attached Figure 6 , Attachment Figure 7 , Attachment Figure 8 , Attachment Fig.10 , Attachment Fig.11 , Attachment Fig.12 and attached Fig.13 The clamping assembly 303 includes a transverse axis 3033, and both ends of the transverse axis 3033 are sleeved with round sleeves 3031, and the two round sleeves 3031 are respectively inserted into the two ends of the two circular through grooves 3024, and the outer wall of the transverse axis 3033 is sleeved with a spring 3032 near the position between the two round sleeves 3031. The two round sleeves 3031 are provided with positioning teeth 30311 at the opposite ends, and both sides of the arc-shaped protrusion 3041 are provided with positioning tooth grooves 30421 distributed at equal distances, and the positioning tooth grooves 30421 are adapted to the arc-shaped protrusion 3041, and the inner sides of the two round sleeves 3031 are provided with guide grooves 30333, two convex pins 30331 are arranged on the outer side of the horizontal axis 3033, and the two convex pins 30331 are respectively slidably arranged in two guide grooves 30333, and the guide groove 30333 includes a straight groove part and an oblique groove part, and the oblique groove part is connected with the straight groove part, and the oblique groove part is arranged obliquely to one side of the spring 3032. Here, when the horizontal axis 3033 rotates, the convex pins 30331 are driven to fall into the straight groove part of the guide groove 30333, so that the two circular sleeves 3031 are close to each other, thereby cooperating with the two positioning teeth 30311 and the arc-shaped protrusion 3041 on the arc-shaped slider 3042 to clamp the arc-shaped slider 3042 in position.

[0048] See attached Figure 7 and attached Fig.10 The side wall of the circular sleeve 3031 is provided with a guide protrusion 30312 along its length direction, and the inner wall of the circular through groove 3024 is provided with a guide groove 30241 adapted to the guide protrusion 30312 , and the guide protrusion 30312 is slidably set in the guide groove 30241 .

[0049] See attached Figure 1 , Attachment Figure 3 and attached Fig. 9 The linkage bracket assembly 4 includes an arched bracket 401, both ends of which are provided with a first guide sleeve 4011, and the two first guide sleeves 4011 are respectively sleeved on the two metal optical axes 201, and the arched bracket 401 is provided with a rotating shaft 4042 on the side close to the movable bracket 3, and a linkage arm 402 is rotatably provided on the rotating shaft 4042, and both ends of the linkage arm 402 are rotatably connected with a rotating arm 403, and the two rotating arms 403 are respectively fixedly connected to the ends of the two transverse shafts 3033 at one end away from the linkage arm 402, and a rotating sleeve 4021 is provided through the middle position of the linkage arm 402, and the rotating sleeve 4021 forms a rotational fit with the rotating shaft 4042, and the coordinated linkage bracket assembly 4, when the pressure rod type jack 1 is pushed When a movable bracket 3 at the bottom moves upward, due to the setting of the bow bracket 401, the linkage arm 402 and the rotating arm 403 during the upward movement, the other movable bracket 3 moves downward synchronously, and the two movable brackets 3 move closer to each other. When the two movable brackets 3 are close to a certain distance, the convex pin 30331 slides in the straight groove part of the guide groove 30333. When the two movable brackets 3 are close to a certain distance, the two convex pins 30331 slide into the oblique groove part of the guide groove 30333, driving the two circular sleeves 3031 to move away from each other, thereby realizing the separation of the positioning teeth 30311 and the positioning tooth grooves 30421 on the arc-shaped slider 3042. At this time, the angle adjustment seat 304 can be rotated to adjust the setting angle of the shearing and pressing mold 7, so that shear tests at different angles can be carried out.

[0050] See attached Fig.14 , Attachment Fig.15 and attached Fig.16 , and also includes an angle detection block 8 arranged between the lower template 701 and the upper template 702, wherein a handrail rod 801 is arranged on one side of the angle detection block 8, and tooth grooves 803 adapted to the shearing teeth 703 are arranged on the sides of the angle detection block 8 close to the lower template 701 and the upper template 702, and an electronic angle meter 802 is embedded in the middle position of the angle detection block 8 close to the handrail rod 801, and the sum of the vertical distance from the arc vertex of the angle adjustment seat 304 to the horizontal plane of the angle adjustment seat 304, the thickness of the lower template 701, the thickness of the upper template 702 and the thickness of the angle detection block 8 is equal to the diameter of the corresponding circle of the arc surface of the angle adjustment seat 304.

[0051] A method for using an asphalt concrete shear strength testing device comprises the following steps:

[0052] Sample testing: Control the compression rod jack 1 to contract, so that a distance for the test block to fit is left between the lower template 701 and the upper template 702, and then place the test block. Then control the compression rod jack 1 to extend, cooperate with the linkage bracket assembly 4, realize the synchronous closeness of the two movable brackets 3, cooperate with the shearing teeth 703 on the lower template 701 and the upper template 702, apply pressure to the test block, and observe the pressure data displayed on the pressure display assembly 5 when the sample is damaged;

[0053] Angle adjustment, place the angle detection block 8 between the lower template 701 and the upper template 702, and align the shearing teeth 703 with the corresponding tooth grooves 803. During the process, the rotating arm 403 drives the horizontal axis 3033 to rotate. When the angle detection block 8 is just clamped, the convex pin 30331 falls into the oblique groove part of the guide groove 30333, so that the two circular sleeves 3031 move away from each other, releasing the activity restriction of the arc-shaped slider 3042, and the axis centers corresponding to the arc surfaces of the two angle adjustment seats 304 are re-aligned at this time. The angles of the two angle adjustment seats 304 can be adjusted by rotating the angle detection block 8. When the appropriate angle is reached, the pressure rod jack 1 is controlled to contract, and the convex pin 30331 slides along the oblique groove portion of the guide groove 30333 into the straight groove portion. The two circular sleeves 3031 are brought close to each other, and the positioning tooth grooves 30421 and the convex pin 30331 are matched to clamp the arc-shaped slider 3042 to limit its rotation, so that the lower template 701 and the upper template 702 on the angle adjustment seat 304 maintain a certain angle.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An asphalt concrete shear strength testing device, comprising a pressure rod jack (1), characterized in that: A guide frame (2) is provided on the upper part of the pressure rod type jack (1), two movable brackets (3) are symmetrically provided on the guide frame (2) for sliding, a pressure display assembly (5) is fixedly provided on the guide frame (2) at a position close to the lower part of the movable bracket (3), and the two movable brackets (3) are installed with shearing and pressing dies (7); The movable bracket (3) comprises a movable plate (301), a support block (302) is arranged at a middle position of a side wall of the movable plate (301), a curved groove (3021) is arranged on a side of the support block (302) away from the movable plate (301), an angle adjustment seat (304) is slidably arranged in the curved groove (3021), a curved surface structure matching the curved groove (3021) is arranged on the angle adjustment seat (304), a curved slider (3042) is arranged on the curved surface of the angle adjustment seat (304), and curved protrusions (3041) are arranged on both sides of the curved slider (3042), a first curved slideway (3022) connected to the curved groove (3021) is arranged on the support block (302), the first curved slideway (3022) matches the curved slider (3042), and the first curved slideway (3022) is adapted to the curved slider (3042). A second arc-shaped slideway (3023) adapted to the two arc-shaped protrusions (3041) is respectively arranged on both sides of an arc-shaped slideway (3022); a circular through groove (3024) is arranged at a middle position below one side of the support block (302) along the width direction of the support block (302); the circular through groove (3024) is connected to the second arc-shaped slideway (3023); a clamping assembly (303) for clamping the arc-shaped slider (3042) is arranged in the circular through groove (3024); a linkage bracket assembly (4) for realizing the synchronous approach or separation of the two movable brackets (3) is arranged between the two movable brackets (3); a pressure sensor (6) is fixedly installed between the telescopic end of the pressure rod type jack (1) and the movable plate (301) located below; the pressure sensor (6) is electrically connected to the pressure display assembly (5); The linkage bracket assembly (4) comprises an arched bracket (401), both ends of the arched bracket (401) are provided with first guide sleeves (4011), and the two first guide sleeves (4011) are respectively sleeved on two metal optical axes (201), a rotating shaft (4042) is provided on the side of the arched bracket (401) close to the movable bracket (3), and a linkage arm (402) is rotatably provided on the rotating shaft (4042), both ends of the linkage arm (402) are rotatably connected to rotating arms (403), the ends of the two rotating arms (403) away from the linkage arm (402) are respectively fixedly connected to the ends of two transverse axes (3033), a rotating sleeve (4021) is provided through the middle position of the linkage arm (402), and the rotating sleeve (4021) and the rotating shaft (4042) form a rotational fit.

2. The asphalt concrete shear strength testing device according to claim 1, characterized in that: The shearing and pressing mould (7) comprises an upper mould plate (702) and a lower mould plate (701) which are arranged opposite to each other, and shearing and pressing teeth (703) are arranged on opposite sides of the lower mould plate (701) and the upper mould plate (702), and the upper mould plate (702) and the lower mould plate (701) are respectively fixedly connected to two angle adjustment seats (304).

3. The asphalt concrete shear strength testing device according to claim 2, characterized in that: The guide frame (2) comprises a top plate (202), and vertically arranged metal optical axes (201) are fixedly arranged on both sides of the top plate (202); side support arms (102) are arranged on the upper parts of both sides of the compression rod type jack (1), and the two side support arms (102) are respectively fixedly connected to the lower ends of the two metal optical axes (201); and a base (101) is arranged below the compression rod type jack (1).

4. The asphalt concrete shear strength testing device according to claim 3 is characterized in that: Guide holes (3011) are provided on both sides of the movable plate (301), the two metal optical axes (201) respectively pass through the two guide holes (3011), optical axis sliding sleeves are provided in the two guide holes (3011), and the movable plate (301) forms a sliding fit with the metal optical axis (201) via the optical axis sliding sleeves.

5. The asphalt concrete shear strength testing device according to claim 3, characterized in that: The pressure display assembly (5) comprises a measuring instrument bracket (501), second guide sleeves (5011) are fixed to both sides of the measuring instrument bracket (501), a bevel portion is provided on one side of the measuring instrument bracket (501), and a measuring instrument (502) is fixed to the bevel portion, the measuring instrument (502) is connected to the pressure sensor (6), two second guide sleeves (5011) are respectively sleeved on two metal optical axes (201), and the two second guide sleeves (5011) are fixedly connected to the metal optical axes (201) by fastening bolts.

6. The asphalt concrete shear strength testing device according to claim 3, characterized in that: The clamping assembly (303) comprises a transverse axis (3033), and both ends of the transverse axis (3033) are sleeved with round sleeves (3031), and the two round sleeves (3031) are respectively inserted into the two ends of the two circular through grooves (3024), and a spring (3032) is sleeved at the position between the two round sleeves (3031) on the outer wall of the transverse axis (3033), and the two round sleeves (3031) are respectively provided with positioning teeth (30311) at opposite ends, and both sides of the arc-shaped protrusion (3041) are provided with positioning teeth distributed at equal distances. The positioning tooth groove (30421) is matched with the arc-shaped protrusion (3041), the inner sides of the two circular sleeves (3031) are provided with guide grooves (30333), the outer side of the horizontal axis (3033) is provided with two convex pins (30331), and the two convex pins (30331) are respectively slidably arranged in the two guide grooves (30333), and the guide groove (30333) includes a straight groove part and an oblique groove part, the oblique groove part is connected with the straight groove part, and the oblique groove part is arranged obliquely to the side of the spring (3032).

7. The asphalt concrete shear strength testing device according to claim 6, characterized in that: The side wall of the circular sleeve (3031) is provided with a guide protrusion (30312) along its length direction, the inner wall of the circular through groove (3024) is provided with a guide groove (30241) adapted to the guide protrusion (30312), and the guide protrusion (30312) is slidably arranged in the guide groove (30241).

8. The asphalt concrete shear strength testing device according to claim 1, characterized in that: The invention also comprises an angle detection block (8) arranged between the lower template (701) and the upper template (702); a handrail rod (801) is arranged on one side of the angle detection block (8); and tooth grooves (803) adapted to the shearing teeth (703) are arranged on the sides of the angle detection block (8) close to the lower template (701) and the upper template (702); an electronic angle meter (802) is embedded in the middle position of the side of the angle detection block (8) close to the handrail rod (801); and the sum of the vertical distance from the vertex of the arc surface of the angle adjustment seat (304) to the horizontal plane of the angle adjustment seat (304), the thickness of the lower template (701), the thickness of the upper template (702) and the thickness of the angle detection block (8) is equal to the diameter of the circle corresponding to the arc surface of the angle adjustment seat (304).

9. The method for using the asphalt concrete shear strength testing device according to claim 8, characterized in that: The steps include: During the test of the sample, the pressure rod jack (1) is controlled to retract, so that a distance for the test block to fit is left between the lower template (701) and the upper template (702), and then the test block is placed. Then, the pressure rod jack (1) is controlled to extend, and the linkage bracket assembly (4) is coordinated to achieve the synchronous approach of the two movable brackets (3), and the shearing teeth (703) on the lower template (701) and the upper template (702) are coordinated to apply pressure to the test block, and the pressure data displayed on the pressure display assembly (5) is observed when the sample is damaged; Angle adjustment, the angle detection block (8) is placed between the lower template (701) and the upper template (702), and the shearing teeth (703) are aligned with the corresponding tooth grooves (803). During the process, the rotating arm (403) drives the horizontal axis (3033) to rotate. When the angle detection block (8) is just clamped, the convex pin (30331) falls into the oblique groove portion of the guide groove (30333), so that the two circular sleeves (3031) move away from each other, releasing the activity restriction of the arc-shaped slider (3042), and the axes corresponding to the arc surfaces of the two angle adjustment seats (304) are now aligned. The angles of the two angle adjustment seats (304) are adjusted by overlapping each other, and then the angle detection block (8) is rotated to adjust the angles of the two angle adjustment seats (304) at the same time. When the appropriate angle is reached, the pressure rod jack (1) is controlled to retract, and the convex pin (30331) slides along the oblique groove portion of the guide groove (30333) into the straight groove portion, and the two circular sleeves (3031) are brought close to each other, and the positioning tooth groove (30421) and the convex pin (30331) are provided to clamp the arc-shaped slider (3042) to limit its rotation, so that the lower template (701) and the upper template (702) on the angle adjustment seat (304) maintain a certain angle.

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