An asphalt concrete shrinkage test device

Abstract

The application discloses a kind of asphalt concrete shrinkage test device, it is related to test device technical field, including frame and concrete workpiece, frame inside is provided with conveying part, conveying part is used to convey concrete workpiece, one side of frame is provided with fixing frame, shrinkage test assembly is set on the fixing frame, shrinkage test assembly is set between the side and top of fixing frame and it is L type distribution, cooperate the rotation of concrete workpiece, the low-temperature shrinkage test change of concrete workpiece top and side is covered mobile type measurement.The asphalt concrete shrinkage test device, through the side wall trajectory drawing piece and the top trajectory drawing piece simultaneously to the side and top of concrete workpiece Covering type trajectory drawing measurement, can obtain the shrinkage information of concrete surface all-around, avoid the data deviation possibly brought by single direction measurement, greatly improve the comprehensiveness and accuracy of measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test devices, in particular to a bituminous concrete shrinkage test device. BACKGROUND

[0002] In the field of road engineering, construction engineering, etc., bituminous concrete is a widely used material, and its performance stability and reliability are crucial. Among them, the shrinkage characteristics of bituminous concrete are one of the key factors affecting its performance and durability. Bituminous concrete will shrink and deform under the influence of factors such as temperature changes, load actions, and time elapses. If this shrinkage is not effectively controlled, it will lead to cracks, potholes and other diseases on the road surface, seriously affecting the service life of the road and driving safety. Therefore, accurately measuring and analyzing the shrinkage of bituminous concrete is of great significance for in-depth study of its shrinkage characteristics, optimization of material formulation, and improvement of construction technology.

[0003] At present, there are some bituminous concrete shrinkage test devices on the market. These devices can measure the shrinkage of bituminous concrete to some extent. Most of the existing bituminous concrete shrinkage test devices use single-direction measurement methods, such as measuring the shrinkage of the side or top of the bituminous concrete test piece. This single-direction measurement method has obvious limitations. Since the shrinkage of bituminous concrete is a complex three-dimensional process, the shrinkage degree and regularity in different directions may differ. Single-direction measurement cannot fully obtain the shrinkage information of the surface of bituminous concrete, which may lead to measurement errors and cannot accurately reflect the actual shrinkage of bituminous concrete, thereby affecting the in-depth study of the shrinkage characteristics of bituminous concrete and the accuracy of subsequent material research and engineering application.

[0004] In terms of measurement efficiency, some existing test devices also have shortcomings. Some devices need to manually adjust the position of the measurement component when measuring different positions of the bituminous concrete test piece, which not only increases the complexity and labor intensity of the operation, but also may lead to inaccurate measurement positions due to human factors, affecting the systematicness and integrity of the measurement. Moreover, the manual intervention method makes the measurement process time-consuming, reducing the overall measurement efficiency and failing to meet the needs of large-scale testing and rapid data acquisition. SUMMARY

[0005] In view of the shortcomings of the prior art, the present application provides a bituminous concrete shrinkage test device to solve the technical problems mentioned in the background.

[0006] In order to achieve the above object, the present application is realized by the following technical scheme: a kind of asphalt concrete shrinkage test device, including frame and concrete workpiece, the inside of frame is provided with conveying part, conveying part is used to convey concrete workpiece, one side of frame is provided with fixed frame, shrinkage test subassembly is arranged on the fixed frame side and top between and is L type distribution, cooperation concrete workpiece rotates, the change of low-temperature shrinkage test of concrete workpiece top and side is covered and moves and measures;

[0007] Shrinkage test subassembly includes the side wall trajectory drawing piece of being provided in the fixed frame side and the top trajectory drawing piece of being provided in the fixed frame top, side wall trajectory drawing piece and top trajectory drawing piece are same structure, and it is L type distribution, while the connecting end of both is provided with power transmission part, i.e. under the action of power transmission part, it is guaranteed that side wall trajectory drawing piece and top trajectory drawing piece both synchronous operation, the side of concrete workpiece and top surface are measured by shrinkage change trajectory drawing.

[0008] As further preferred of the present technical solution, top trajectory drawing piece includes fixed rod fixedly installed on fixed frame, moving block is transversely slidably connected on fixed rod, support block is fixedly installed on one side of moving block, slide rod is slidably connected on both sides of support block, connecting plate is fixedly connected on the bottom end of slide rod, and first damping spring is arranged between connecting plate and support block and is sleeved on slide rod, detection rod is arranged on one side of connecting plate, and ball is arranged at the end of detection rod, and ball and the top surface of concrete workpiece are in rolling contact.

[0009] As further preferred of the present technical solution, top trajectory drawing piece further includes unwinding roller and winding roller rotatably installed on moving block, recording paper is arranged on unwinding roller, one end of recording paper is connected with winding roller, marking pen is fixedly connected on the top of slide rod, and marking pen and recording paper are in perpendicular distribution state.

[0010] As further preferred of the present technical solution, power transmission part includes driving motor fixedly installed on fixed frame, connecting rod is fixedly connected on the output end of driving motor, connecting shaft is drivingly connected with connecting rod through first synchronous belt pulley transmission part, connecting shaft is rotatably installed on fixed frame, adjusting gear is fixedly connected on the top of connecting shaft, vertical rod is rotatably installed on one side of connecting shaft, switching gear is fixedly connected on the bottom end of vertical rod and is matched with adjusting gear, second bevel gear is fixedly connected on vertical rod, first bevel gear is meshingly connected on one side of second bevel gear, reciprocating screw rod is fixedly connected on the axis of first bevel gear, reciprocating screw rod is rotatably installed on fixed frame, and moving block is threadedly connected with reciprocating screw rod.

[0011] As a further preferred embodiment of the present technical solution, the connecting rod top is fixedly connected with a first spline rod, the first spline rod top is slidingly connected with a connecting block in the vertical direction, the connecting block top is fixedly connected with a control rod, the connecting block two sides are provided with air cylinders fixedly installed on the fixed frame, the air cylinder output end is fixedly connected with a sleeve, and the sleeve is rotationally connected with the connecting block.

[0012] As a further preferred embodiment of the present technical solution, the fixed frame top is fixedly connected with an extension rod, the extension rod bottom is rotationally connected with a movable column, the movable column and the control rod are located at the same axis position, and a third damping spring is sleeved on the extension rod.

[0013] As a further preferred embodiment of the present technical solution, the rack one side top is fixedly installed with a positioning block, the positioning block upper and lower ends are slidingly connected with control plates, the two control plates are rotationally connected with first rotating rods, the first rotating rod outer wall is fixedly connected with a first cleaning roller for cleaning the concrete workpiece side wall, the control plate is fixedly installed with a fixed seat, the fixed seat is provided with a second spline rod, the second spline rod is rotationally installed on the positioning block, the second spline rod other end is fixedly connected with a second rotating rod, and the second rotating rod outer wall is fixedly connected with a second cleaning roller for cleaning the concrete workpiece top.

[0014] As a further preferred embodiment of the present technical solution, the first rotating rod top is fixedly connected with a fourth bevel gear, the fixed seat outer wall is rotationally connected with a third bevel gear meshing with the fourth bevel gear, the third bevel gear is transversely slidingly connected with the second spline rod, and the first rotating rod top is drivingly connected with the connecting rod through a second synchronous belt pulley transmission member.

[0015] As a further preferred embodiment of the present technical solution, the fixed seat one end is fixedly connected with a sliding rod slidingly installed on the positioning block, and a second damping spring is provided between the fixed seat and the positioning block and sleeved on the sliding rod.

[0016] Compared with the prior art, the present technical solution has the following beneficial effects:

[0017] The side wall trajectory drawing piece and the top trajectory drawing piece simultaneously cover the side and top of the concrete workpiece, so that the comprehensive shrinkage information of the concrete surface can be obtained, the data deviation caused by single direction measurement can be avoided, and the comprehensiveness and accuracy of measurement are greatly improved; during the circumferential rotation of the concrete workpiece, the ball at the end of the detection rod is in real-time close contact with the surface, and the marker pen synchronously draws a trajectory on the recording paper, so that the dynamic and continuous monitoring of the concrete shrinkage is realized, the small changes in the concrete shrinkage process can be captured in time, and rich data support is provided for in-depth research on the concrete shrinkage characteristics; the transmission system composed of the driving motor, the adjusting gear and the switching gear automatically adjusts the position of the detection rod on the concrete surface after the concrete workpiece rotates one circle, so that the device can sequentially measure different positions on the concrete surface without manual intervention, the measurement efficiency is improved, and the systematicness and integrity of measurement are ensured; by comparing the measurement trajectories before and after the low-temperature test and calculating the data difference, the shrinkage of the concrete in the low-temperature environment can be directly obtained, and the intuitive data presentation mode is convenient for researchers to quickly understand the low-temperature performance change of the concrete, so as to provide a strong decision basis for the research and development, improvement and engineering application of the concrete material.

[0018] The connecting rod drives the first rotating rod and the first cleaning roller to rotate through the second synchronous pulley transmission, so that the side wall of the concrete workpiece is cleaned; at the same time, the second spline rod, the second rotating rod and the second cleaning roller are driven to rotate through the transmission of the fourth bevel gear and the third bevel gear meshing on the first rotating rod, so that the top of the concrete workpiece is cleaned, the synchronous cleaning of the side wall and the top of the concrete workpiece is realized, the accuracy of the detection results such as subsequent shrinkage measurement is avoided due to the adhesion of impurities on the concrete surface, and the reliability of the detection data is ensured, the first cleaning roller and the second cleaning roller continuously rotate during the circumferential rotation of the concrete workpiece, so that the surface of the concrete workpiece can be continuously cleaned, the concrete surface is kept clean during the whole measurement process, a stable environment condition is provided for accurate measurement, and the first cleaning roller can always maintain the relative positional relationship with the side wall of the concrete workpiece, so that the first cleaning roller can closely adhere to the side wall for effective cleaning regardless of the position change of the concrete workpiece during rotation, and the adaptability and flexibility of the cleaning device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 It is Figure 1 a schematic diagram of the structure of the side surface;

[0021] Figure 3Structure diagram of top trajectory drawing piece in the application;

[0022] Figure 4 Structure diagram of power transmission piece in the application;

[0023] Figure 5 Structure diagram of first spline rod and connection block in the application;

[0024] Figure 6 Structure diagram of first cleaning roller, second cleaning roller and concrete workpiece in the application;

[0025] Figure 7 Structure diagram of positioning block, first cleaning roller and second cleaning roller in the application;

[0026] Figure 8 Structure diagram of control board, first rotating rod, second spline rod and second rotating rod in the application.

[0027] In the figure: 1, rack; 2, conveying piece; 3, concrete workpiece; 4, fixing frame; 5, shrinkage test assembly; 51, fixed rod; 52, moving block; 53, reciprocating screw rod; 54, supporting block; 55, sliding rod; 56, connecting plate; 57, detection rod; 58, first damping spring; 59, unwinding roller; 510, recording paper; 511, winding roller; 512, first bevel gear; 513, vertical rod; 514, second bevel gear; 515, switching gear; 516, driving motor; 517, connecting rod; 518, connecting shaft; 519, first synchronous belt wheel transmission piece; 520, adjusting gear; 521, first spline rod; 522, air cylinder; 523, connection block; 524, sleeve; 525, control rod; 526, positioning block; 527, control board; 528, first rotating rod; 529, first cleaning roller; 530, second rotating rod; 531, second cleaning roller; 532, fixed seat; 533, third bevel gear; 534, fourth bevel gear; 535, sliding rod; 536, second damping spring; 537, telescopic rod; 538, movable column; 539, third damping spring; 540, second spline rod; 541, second synchronous belt wheel transmission piece; 542, marker pen. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the application.

[0029] Embodiment one: combined with the description of the drawings, Figures 1-8As shown, the present application provides a technical scheme: a kind of asphalt concrete shrinkage test device, including rack 1 and concrete workpiece 3, the inside of rack 1 is provided with conveying part 2, conveying part 2 is used to convey concrete workpiece 3, one side of rack 1 is provided with fixed frame 4, fixed frame 4 is provided with shrinkage test assembly 5, shrinkage test assembly 5 is arranged between the side and top of fixed frame 4 and is L type distribution, cooperation concrete workpiece 3 rotation, the low-temperature shrinkage test change of the top and side of concrete workpiece 3 is covered and moves and measures;

[0030] Shrinkage test assembly 5 includes the side wall trajectory drawing piece of being provided in the side of fixed frame 4 and the top trajectory drawing piece of being provided in the top of fixed frame 4, side wall trajectory drawing piece and top trajectory drawing piece structure are same, and it is L type distribution, while the connecting end of two is provided with power transmission part, i.e. under the action of power transmission part, ensure that side wall trajectory drawing piece and top trajectory drawing piece both synchronous operation, the side and top of concrete workpiece 3 are measured to draw and measure the shrinkage change trajectory;

[0031] Top trajectory drawing piece includes fixed rod 51 fixedly installed on fixed frame 4, moving block 52 is connected in sliding mode on fixed rod 51, moving block 52 one side is fixedly installed with support block 54, support block 54 both sides are slidably connected with slide rod 55, the bottom end of slide rod 55 is fixedly connected with connecting plate 56, and first damping spring 58 is arranged between connecting plate 56 and support block 54 and is sleeved on slide rod 55, under the elastic force of first damping spring 58, connecting plate 56, detection rod 57 are pushed to one side of concrete workpiece 3, so that the ball at the end of detection rod 57 is located on the surface of concrete workpiece 3, one side of connecting plate 56 is provided with detection rod 57, detection rod 57 end is provided with ball, and ball and the top surface of concrete workpiece 3 are in rolling contact, when concrete workpiece 3 rotates, the ball at the end of detection rod 57 is located on the surface of concrete workpiece 3 and slides, since concrete workpiece 3 appears shrinkage, so as to drive detection rod 57 synchronous movement, so that detection rod 57 drives connecting plate 56, slide rod 55, marker pen 542 synchronous movement, so that marker pen 542 is located on the record paper 510 and slides and records;

[0032] The top trajectory drawing piece further comprises a pay-off roller 59 and a take-up roller 511 rotatably installed on the moving block 52, the pay-off roller 59 is provided with a recording paper roll 510, one end of the recording paper roll 510 is connected with the take-up roller 511, the top of the slide rod 55 is fixedly connected with a marking pen 542, and the marking pen 542 is in a vertically distributed state with the recording paper roll 510, that is, when the detection rod 57 elastically stretches and contracts, the marking pen 542 is synchronously driven to slide on the recording paper roll 510, so as to draw the corresponding concrete shrinkage change, and the take-up roller 511 is used to wind the recording paper roll 510 on the pay-off roller 59, so that the recording paper roll 510 moves and draws on the recording paper roll 510 during winding;

[0033] The power transmission member comprises a driving motor 516 fixedly installed on the fixed frame 4, a connecting rod 517 fixedly connected to the output end of the driving motor 516, a connecting shaft 518 in driving connection with the connecting rod 517 through a first synchronous belt wheel transmission member 519, the connecting shaft 518 being rotatably installed on the fixed frame 4, an adjusting gear 520 fixedly connected to the top of the connecting shaft 518, the number of gears of the adjusting gear 520 can be selected according to the actual required moving distance of the detection rod 57, a vertical rod 513 rotatably installed on the rack 1 being arranged on one side of the connecting shaft 518, a switching gear 515 fixedly connected to the bottom end of the vertical rod 513 and matched with the adjusting gear 520, a second bevel gear 514 fixedly connected to the vertical rod 513, the first bevel gear 512 being in meshing connection with one side of the second bevel gear 514, the first bevel gear 512 being fixedly connected to the shaft center of the reciprocating lead screw 53, the reciprocating lead screw 53 being rotatably installed on the fixed frame 4, and the moving block 52 being in screw connection with the reciprocating lead screw 53.

[0034] In the embodiment of the present application, by driving the concrete workpiece 3 to rotate circumferentially, the ball at the end of the detection rod 57 moves on the surface of the circumferentially rotating concrete workpiece 3, when the detection rod 57 elastically stretches and contracts, the marker pen 542 is simultaneously driven to slide on the recording paper 510, thereby drawing the corresponding concrete shrinkage change; when the concrete workpiece 3 rotates one round, by starting the driving motor 516 to drive the connecting rod 517 to rotate synchronously, the connecting rod 517 drives the connecting shaft 518 and the adjusting gear 520 to rotate synchronously through the first synchronous belt transmission member 519, when the adjusting gear 520 rotates to mesh with the switching gear 515, the switching gear 515, the vertical rod 513 and the second bevel gear 514 can be driven to rotate synchronously, the second bevel gear 514 drives the meshed first bevel gear 512 and the reciprocating lead screw 53 to rotate, so that the rotating reciprocating lead screw 53 drives the moving block 52 to move, so that the moving block 52 drives the supporting block 54, the slide rod 55, the connecting plate 56, the detection rod 57, the marker pen 542, the unwinding roller 59, the winding roller 511 and the recording paper 510 to move synchronously, thereby adjusting the position of the detection rod 57 on the surface of the concrete workpiece 3, when the adjusting gear 520 rotates to not mesh with the switching gear 515, the moving block 52, the supporting block 54, the slide rod 55, the connecting plate 56, the detection rod 57, the marker pen 542, the unwinding roller 59, the winding roller 511 and the recording paper 510 do not change the synchronous moving position, that is, it is understood that after the concrete workpiece 3 rotates one round, the moving mapping is carried out by the marker pen 542, and the position of the detection rod 57 on the concrete workpiece 3 is adjusted when the concrete workpiece 3 rotates one round, so that the shrinkage mapping of different positions on the surface of the concrete workpiece 3 can be carried out, and thus the side wall trajectory drawing member and the top trajectory drawing member can cover the side and top of the concrete workpiece 3 again for trajectory drawing measurement;

[0035] When the connecting rod 517 rotates, the connecting shaft 518 is driven to rotate synchronously through the first synchronous belt transmission member 519, the connecting shaft 518 drives the adjusting gear 520 to rotate synchronously, when the adjusting gear 520 rotates to mesh with the switching gear 515, the switching gear 515, the vertical rod 513 and the second bevel gear 514 can be driven to rotate, the second bevel gear 514 drives the meshed first bevel gear 512 and the reciprocating lead screw 53 to rotate, so that the reciprocating lead screw 53 drives the moving block 52 to move, so that the moving block 52 drives the supporting block 54, the slide rod 55, the connecting plate 56, the detection rod 57, the unwinding roller 59, the winding roller 511 and the recording paper 510 to move synchronously with the marker pen 542, and the marker pen 542 moves on the recording paper 510 to draw;

[0036] The side wall trajectory drawing piece and the top trajectory drawing piece are used to perform overlaid trajectory drawing measurement on the side and top of the concrete workpiece 3, and then the data is recorded. Then, after the concrete is placed in a low-temperature environment for a test time, the side wall trajectory drawing piece and the top trajectory drawing piece are used to perform overlaid trajectory drawing measurement again on the side and top of the concrete workpiece 3. The trajectories drawn in two times are compared, and then the data difference is calculated, so as to accurately obtain the shrinkage of the concrete in the low-temperature test.

[0037] The side wall trajectory drawing piece and the top trajectory drawing piece are used to perform overlaid trajectory drawing measurement on the side and top of the concrete workpiece 3, and then the data is recorded. Then, after the concrete is placed in a low-temperature environment for a test time, the side wall trajectory drawing piece and the top trajectory drawing piece are used to perform overlaid trajectory drawing measurement again on the side and top of the concrete workpiece 3. The trajectories drawn in two times are compared, and then the data difference is calculated, so as to accurately obtain the shrinkage of the concrete in the low-temperature test. In the circumferential rotation process of the concrete workpiece 3, the end ball of the detection rod 57 is in real-time contact with the surface and moves synchronously, and the marker pen 542 draws a trajectory on the recording paper 510 at the same time, so that dynamic and continuous monitoring of the concrete shrinkage is realized. This monitoring method can timely capture the tiny changes in the concrete shrinkage process, and provides rich data support for in-depth study of the shrinkage characteristics of the concrete. The transmission system composed of the driving motor 516, the adjusting gear 520 and the switching gear 515 automatically adjusts the position of the detection rod 57 on the concrete surface after the concrete workpiece rotates one circle, so that the device can sequentially measure different positions on the concrete surface without manual intervention, thereby improving the measurement efficiency and ensuring the systematicness and integrity of the measurement. By comparing the measurement trajectories before and after the low-temperature test and calculating the data difference, the shrinkage of the concrete in the low-temperature environment can be directly obtained, and this intuitive data presentation method facilitates researchers to quickly understand the low-temperature performance changes of the concrete, thereby providing a strong decision basis for the research, improvement and engineering application of the concrete material.

[0038] Embodiment two: combined with Figure 4 , Figure 5As shown, on the basis of embodiment one, the top of the connecting rod 517 is fixedly connected with a first spline rod 521, the top of the first spline rod 521 is slidably connected with a connecting block 523 in the vertical direction, the top of the connecting block 523 is fixedly connected with a control rod 525, and the top of the control rod 525 can be provided with a corresponding rectangular plate according to the size of the concrete workpiece 3, that is, when the control rod 525 moves upward, the rectangular plate is in contact with the bottom of the concrete workpiece 3, thereby conveniently and stably driving the concrete workpiece 3 to rotate in a circle, and it is noted that the present application does not provide a corresponding rectangular plate, and the two sides of the connecting block 523 are provided with air cylinders 522 fixedly installed on the fixed frame 4, the output end of the air cylinder 522 is fixedly connected with a sleeve 524, and the sleeve 524 is rotatably connected with the connecting block 523, and the sleeve 524, the connecting block 523 and the control rod 525 can be synchronously moved by opening the air cylinder 522, and the connecting block 523 moves up and down while always maintaining the sliding connection with the first spline rod 521 in the vertical direction.

[0039] The top of the fixed frame 4 is fixedly connected with an extension rod 537, the bottom of the extension rod 537 is rotatably connected with a movable column 538, the movable column 538 is located at the same axis position as the control rod 525, and a third damping spring 539 is sleeved on the extension rod 537, and under the elastic force of the third damping spring 539, the movable column 538 can be pushed to move downward.

[0040] In the embodiment of the present application, when it is necessary to drive the concrete workpiece 3 to rotate, the sleeve 524, the connecting block 523 and the control rod 525 are driven to move upward by opening the air cylinder 522, so that the control rod 525 pushes the concrete workpiece 3 to move upward, so that the top of the concrete workpiece 3 is in contact with the movable column 538 and compresses the third damping spring 539, and then when the connecting rod 517 and the first spline rod 521 are driven to rotate by the driving motor 516, the first spline rod 521 can drive the connecting block 523 and the control rod 525 to rotate synchronously, so that the control rod 525 drives the concrete workpiece 3 to rotate in a circle.

[0041] Embodiment three: combined with Figure 1 , Figure 4 , Figure 6 , Figure 7 , Figure 8As shown, on the basis of embodiment two, the top of one side of the rack 1 is fixedly provided with a positioning block 526, slidingly connected with a control plate 527 at the upper and lower ends of the positioning block 526, and the control plate 527 is provided with a rounded corner close to one end of the concrete workpiece 3, so as to facilitate the subsequent rotation of the concrete workpiece 3, and the two control plates 527 are rotatably connected with a first rotating rod 528, and the outer wall of the first rotating rod 528 is fixedly connected with a first cleaning roller 529 for cleaning the side wall of the concrete workpiece 3, and the control plate 527 is fixedly provided with a fixed seat 532, and the fixed seat 532 is provided with a second spline rod 540, and the fixed seat 532 is sleeved on the second spline rod 540, and when the control plate 527 moves laterally, the fixed seat 532 can slide on the second spline rod 540 without affecting the rotation of the second spline rod 540, and the second spline rod 540 is rotatably installed on the positioning block 526, and the other end of the second spline rod 540 is fixedly connected with a second rotating rod 530, and the outer wall of the second rotating rod 530 is fixedly connected with a second cleaning roller 531 for cleaning the top of the concrete workpiece 3;

[0042] The top of the first rotating rod 528 is fixedly connected with a fourth bevel gear 534, the outer wall of the fixed seat 532 is rotatably connected with a third bevel gear 533 engaged with the fourth bevel gear 534, and the third bevel gear 533 is laterally slidably connected with the second spline rod 540, and the top of the first rotating rod 528 is drivingly connected with the connecting rod 517 through a second synchronous belt transmission member 541;

[0043] One end of the fixed seat 532 is fixedly connected with a sliding rod 535 slidingly installed on the positioning block 526, and the fixed seat 532 and the positioning block 526 are provided with a second damping spring 536 sleeved on the sliding rod 535, and under the elastic force of the second damping spring 536, the end of the control plate 527 can be pushed to abut against the outer wall of the concrete workpiece 3.

[0044] In the embodiment of the application, when the connecting rod 517 rotates, the first rotating rod 528 can be driven to rotate synchronously through the second synchronous belt transmission member 541, the first rotating rod 528 drives the first cleaning roller 529 to rotate, so that the first cleaning roller 529 cleans the side wall of the concrete workpiece 3;

[0045] Meanwhile, the first rotating rod 528 rotates to drive the second spline rod 540, the second rotating rod 530 and the second cleaning roller 531 to rotate synchronously through the engaged fourth bevel gear 534 and third bevel gear 533, so that the second cleaning roller 531 cleans the top of the concrete workpiece 3;

[0046] When the concrete workpiece 3 rotates, the side wall of the concrete workpiece 3 is in contact with the control plate 527, so that the concrete workpiece 3 can drive the control plate 527 to move synchronously when rotating, so that the control plate 527 drives the first rotating rod 528, the first cleaning roller 529, the fixed seat 532, the sliding rod 535, the fourth bevel gear 534 and the third bevel gear 533 to move synchronously, so as to ensure the relative position relationship between the first cleaning roller 529 and the side wall of the concrete workpiece 3, and ensure the cleaning of the first cleaning roller 529 to the side wall of the concrete workpiece 3.

[0047] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An asphalt concrete shrinkage test device comprising a frame (1) and a concrete workpiece (3), characterised in that: The rack (1) is provided with a conveying part (2) on the inner side, the conveying part (2) is used for conveying the concrete workpiece (3), one side of the rack (1) is provided with a fixing frame (4), the fixing frame (4) is provided with a shrinkage test assembly (5), the shrinkage test assembly (5) is arranged between the side and the top of the fixing frame (4) and is distributed in an L shape, and the shrinkage test assembly (5) is matched with the rotation of the concrete workpiece (3) to cover and move to measure the low-temperature shrinkage test change of the top and the side of the concrete workpiece (3); The shrinkage test assembly (5) comprises a side wall trajectory drawing part arranged on the side of the fixing frame (4) and a top trajectory drawing part arranged on the top of the fixing frame (4), the side wall trajectory drawing part and the top trajectory drawing part are the same in structure and are distributed in an L shape, and the connecting ends of the two are provided with a power transmission part, that is, under the action of the power transmission part, the synchronous operation of the side wall trajectory drawing part and the top trajectory drawing part is ensured, and the shrinkage change trajectory of the side and the top of the concrete workpiece (3) is measured; The top trajectory drawing part comprises a fixed rod (51) fixedly installed on the fixing frame (4), a moving block (52) transversely and slidably connected to the fixed rod (51), a supporting block (54) fixedly installed on one side of the moving block (52), slide rods (55) slidably connected to the two sides of the supporting block (54), a connecting plate (56) fixedly connected to the bottom ends of the slide rods (55), a first damping spring (58) arranged between the connecting plate (56) and the supporting block (54) and sleeved on the slide rods (55), a detection rod (57) arranged on one side of the connecting plate (56), and a ball arranged at the end of the detection rod (57) and in rolling contact with the top surface of the concrete workpiece (3); The power transmission part comprises a driving motor (516) fixedly installed on the fixing frame (4), a connecting rod (517) fixedly connected to the output end of the driving motor (516), a connecting shaft (518) in transmission connection with the connecting rod (517) through a first synchronous belt transmission part (519), the connecting shaft (518) being rotatably installed on the fixing frame (4), an adjusting gear (520) fixedly connected to the top of the connecting shaft (518), a vertical rod (513) rotatably installed on the rack (1) and arranged on one side of the connecting shaft (518), a switching gear (515) fixedly connected to the bottom end of the vertical rod (513) and matched with the adjusting gear (520), a second bevel gear (514) fixedly connected to the vertical rod (513), a first bevel gear (512) in meshing connection with one side of the second bevel gear (514), a reciprocating screw rod (53) fixedly connected to the shaft center of the first bevel gear (512), and the reciprocating screw rod (53) being rotatably installed on the fixing frame (4) and in threaded connection with the moving block (52). The top of the connecting rod (517) is fixedly connected with a first spline rod (521), the top of the first spline rod (521) is slidably connected with a connecting block (523), the top of the connecting block (523) is fixedly connected with a control rod (525), both sides of the connecting block (523) are provided with air cylinders (522) fixedly installed on the fixed frame (4), the output end of the air cylinder (522) is fixedly connected with a sleeve (524), and the sleeve (524) is rotatably connected with the connecting block (523).

2. An asphalt concrete shrinkage test device according to claim 1, wherein: The top trajectory drawing piece further comprises a pay-off roller (59) and a winding roller (511) rotatably installed on the moving block (52), the pay-off roller (59) is provided with a recording paper roll (510), one end of the recording paper roll (510) is connected with the winding roller (511), the top of the sliding rod (55) is fixedly connected with a marking pen (542), and the marking pen (542) and the recording paper roll (510) are in a vertically distributed state.

3. An asphalt concrete shrinkage test device according to claim 2, wherein: The top of the fixed frame (4) is fixedly connected with a telescopic rod (537), the bottom of the telescopic rod (537) is rotatably connected with a movable column (538), the movable column (538) is located at the same axis position as the control rod (525), and a third damping spring (539) is sleeved on the telescopic rod (537).

4. An asphalt concrete shrinkage test device according to claim 3, wherein: The top of one side of the rack (1) is fixedly installed with a positioning block (526), the positioning block (526) is slidably connected with control plates (527) at the upper and lower ends, two control plates (527) are rotatably connected with first rotating rods (528), the first rotating rods (528) are fixedly connected with first cleaning rollers (529) for cleaning the side walls of the concrete workpiece (3), the control plates (527) are fixedly installed with fixed seats (532), the fixed seats (532) are provided with second spline rods (540), the second spline rods (540) are rotatably installed on the positioning block (526), the second spline rods (540) are fixedly connected with second rotating rods (530) at the other ends, and the second rotating rods (530) are fixedly connected with second cleaning rollers (531) for cleaning the top of the concrete workpiece (3).

5. An asphalt concrete shrinkage test apparatus as claimed in claim 4, wherein: The top of the first rotating rod (528) is fixedly connected with a fourth bevel gear (534), the outer wall of the fixed seat (532) is rotatably connected with a third bevel gear (533) engaged with the fourth bevel gear (534), the third bevel gear (533) is slidably connected with the second spline rod (540) in the transverse direction, and the top of the first rotating rod (528) is drivingly connected with the connecting rod (517) through a second synchronous belt pulley transmission member (541).

6. An asphalt concrete shrinkage test device according to claim 5, wherein: One end of the fixed seat (532) is fixedly connected with a sliding rod (535) slidably installed on the positioning block (526), and a second damping spring (536) is sleeved on the sliding rod (535) and arranged between the fixed seat (532) and the positioning block (526).

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