CN113758802B - Automatic detection device for structural strength of asphalt pavement - Google Patents
Automatic detection device for structural strength of asphalt pavement Download PDFInfo
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- CN113758802B CN113758802B CN202111045010.3A CN202111045010A CN113758802B CN 113758802 B CN113758802 B CN 113758802B CN 202111045010 A CN202111045010 A CN 202111045010A CN 113758802 B CN113758802 B CN 113758802B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an automatic detection device for the structural strength of an asphalt pavement, which comprises a pressurizing table, a pressurizing device, an upper pressing plate, a lower pressing plate, an upper pressing plate lifting system, a test piece taking and placing system, a test piece conveying system and a test piece centering system, wherein the upper pressing plate lifting system is used for lifting the test piece; the upper pressing plate lifting system can automatically separate the upper pressing plate from the lower pressing plate, the test piece conveying system conveys the test piece to the test piece taking and placing frame of the test piece taking and placing system through the conveying belt, the test piece taking and placing system automatically places the test piece between the upper pressing plate and the lower pressing plate or takes out the test piece from the upper pressing plate and the lower pressing plate, and the automatic centering system adjusts and maintains the axle center of the test piece and the axle center of the upper pressing plate and the lower pressing plate on the same plane through the two clamping plates. The invention can realize the automatic detection of the test piece and improve the detection precision.
Description
Technical Field
The invention belongs to the technical field of road construction, and relates to a device for automatically detecting the structural strength of an asphalt pavement.
Background
After the rolling of the asphalt pavement is completed, the structural strength (modulus) of the pavement needs to be detected. The normal detection method is that test pieces with certain specification and quantity are drilled on the road surface, the test pieces are placed into a special detection device, a splitting test is carried out according to T0716 procedure, so that the maximum load is obtained, and then the compressive strength of the test pieces is calculated according to a splitting tensile strength formula. The test pieces are typically cylindrical in shape and require testing of multiple test pieces for each test.
The existing detection device is shown in fig. 1, and comprises a pressurizing table 1, wherein the top surfaces of two ends of the pressurizing table are respectively provided with a stand column 2, the upper ends of the two stand columns are fixedly provided with a top plate 3, and the bottom surface of the top plate is provided with a pressure sensor 4; the middle of the top surface of the pressurizing table is provided with a pressurizing device 5, a lower pressing plate 6 is arranged above the pressurizing device, the top surface of the lower pressing plate is provided with a lower pressing bar 7, an upper pressing plate 8 is arranged above the lower pressing plate, and the bottom surface of the upper pressing plate is provided with an upper pressing bar 9 which is opposite to the lower pressing bar; two pressing plate guide rods 10 are fixedly arranged at two ends of the lower pressing plate, and the upper pressing plate is slidably sleeved on the two pressing plate guide rods 10.
As shown in fig. 2, the upper platen 8 is lifted upward, the test piece 11 is placed between the upper and lower press bars 9 and 7 of the upper and lower platens, and the pressurizing device 5 pushes the lower platen 6 upward to pressurize the test piece 11.
The existing detection device and detection mode have the following problems:
(1) The upper pressing plate is required to be lifted upwards manually, the test piece is placed between the upper pressing plate and the lower pressing plate, after one test piece is detected, the test piece is taken out manually and then is placed into the other test piece, the test piece is taken out and placed manually, and the degree of automation is low;
(2) When pressurizing, the axis of the test piece and the central line of the upper pressing strip and the lower pressing strip are on the same plane vertical to the horizontal plane, but when the test piece is manually placed, the test piece is easy to deviate due to manual observation errors, and the accuracy of the detection result is affected.
Disclosure of Invention
The invention aims to solve the problems and provide an automatic detection device for the structural strength of an asphalt pavement, which improves the detection efficiency and the detection precision.
The technical scheme of the invention is as follows:
the automatic detection device for the structural strength of the asphalt pavement comprises a pressurizing table, wherein the top surfaces of two ends of the pressurizing table are respectively provided with an upright post, the upper ends of the two upright posts are fixedly provided with a top plate, and a pressure sensor is arranged in the middle of the bottom surface of the top plate; a pressurizing device is arranged in the middle of the top surface of the pressurizing table, a lower pressing plate is arranged at the top of the pressurizing device, a lower pressing strip is arranged on the top surface of the lower pressing plate, an upper pressing plate is arranged above the lower pressing plate, and an upper pressing strip which is opposite to the lower pressing strip is arranged on the bottom surface of the upper pressing plate; two ends of the lower pressing plate are respectively fixedly provided with a guide rod, and the upper pressing plate is movably sleeved on the two guide rods, and is characterized in that: still include top board operating system, test piece get put system, test piece transport system and test piece centering system, wherein:
the upper pressing plate lifting system comprises two supporting rods which vertically penetrate through two ends of the lower pressing plate, the supporting rods are sleeves provided with internal threads, the lower pressing plate can slide up and down along the two supporting rods, the upper ends of the two supporting rods are fixedly connected with the bottom surfaces of the two ends of the upper pressing plate, the lower ends of the two supporting rods are respectively connected with a height adjusting screw rod through the internal threads in a threaded manner, the two height adjusting screw rods are respectively connected with a first motor which drives the height adjusting screw rods to rotate, and the two first motors are fixed on the pressurizing table;
the test piece taking and placing system comprises a test piece taking and placing frame and a test piece taking and placing frame rotating system; the test piece taking and placing rack rotating system comprises a rod gear, two ends of a rotating shaft of the rod gear are respectively inserted into two side walls of the mounting groove, and a second motor for driving the rod gear to rotate is arranged on a rotating shaft at one end of the mounting groove; two vertical rods are arranged in front of the rod-type gear, the lower ends of the two vertical rods are respectively fixed on the bottom surface of the mounting groove, a cross beam is rotatably arranged between the upper ends of the two vertical rods, two ends of the cross beam are respectively provided with a rotating shaft, the rotating shafts at the two ends of the cross beam respectively penetrate through the outer sides of the two vertical rods and are respectively and fixedly connected with a driven gear, and the two driven gears are respectively meshed with the rod-type gear; the test piece taking and placing frame comprises a first cross rod and a second cross rod which are parallel to the cross beam, a main connecting rod which is perpendicular to the first cross rod and the second cross rod is fixedly connected between the first cross rod and the second cross rod, the main connecting rod is a sleeve pipe provided with internal threads, a bracket lifting screw rod which is perpendicular to the cross beam is arranged in the middle of the cross beam in a penetrating way, one end of the bracket lifting screw rod is positioned at one side of the cross beam, which faces the mounting groove, and is connected with a third motor which drives the bracket lifting screw rod to rotate, and the other end of the bracket lifting screw rod penetrates through the first cross rod and is in threaded connection with the internal threads of the main connecting rod; the side, opposite to the first cross rod, of the second cross rod is fixedly connected with 3 test piece receiving rods parallel to the main connecting rod, and the 3 test piece receiving rods are arranged in parallel and have a certain interval; the top surface of the second cross rod is connected with two fixed supporting rods perpendicular to the test piece receiving rod, the lower ends of the two fixed supporting rods are fixedly connected with the second cross rod, one sides of the two fixed supporting rods, which face the test piece receiving rod, are longitudinally provided with a sliding groove respectively, sliding supporting rods parallel to the fixed supporting rods are arranged along the sliding groove, the sliding supporting rods are provided with a sliding block which is limited in the sliding groove and can slide along the sliding groove, a sliding screw rod is arranged in the sliding groove, the sliding screw rod is in threaded rotation connection with the sliding block, one end of the sliding screw rod penetrates through the bottom surface of the second cross rod, and is connected with a fourth motor for driving the sliding screw rod to rotate; the distance between the two sliding support rods is smaller than the diameter of the asphalt pavement structural strength detection test piece, and a test piece pushing plate is fixedly connected between the lower ends of the two sliding support rods; the sum of the thicknesses of the support rods and the sliding support rods is smaller than the height of the lower pressing strip;
the test piece conveying system comprises 4 small conveyor belts which are arranged in parallel, a certain gap is reserved between every two adjacent conveyor belts, and 3 test piece receiving rods of the test piece taking and placing frame are respectively positioned in the 3 gaps among the 4 conveyor belts along the direction parallel to the conveyor belts in a horizontal state;
the test piece centering system comprises two clamping plates, wherein the two clamping plates are perpendicular to the lower pressing plate and are symmetrically arranged on two sides of the lower pressing bar on the top surface of the lower pressing plate; two strip-shaped sliding holes perpendicular to the lower pressing strips are respectively formed in the two sides of the lower pressing strips on the lower pressing plate, two sliding blocks penetrating to the bottom surface of the lower pressing plate through the strip-shaped sliding holes are arranged at the bottom of each clamping plate, and each sliding block is fixedly connected with a nut on the bottom surface of the lower pressing plate; two double-headed screws are arranged on the bottom surface of the lower pressing plate along the direction parallel to the strip-shaped sliding holes, the screw thread directions of the two ends of the double-headed screws are opposite, and the two ends of each double-headed screw are respectively in screw connection with two opposite nuts at the bottoms of the two clamping plates; one end of each double-end screw is also connected with a fifth motor for driving the double-end screw to rotate.
The invention has the following advantages:
(1) The test piece can be automatically placed in the detection device, and the test piece is automatically taken out after the detection is finished, so that the automation of the test piece detection process is realized;
(2) The test piece can be accurately positioned between the upper pressing bar and the lower pressing bar, the influence of position errors on the detection result is reduced, and the detection precision is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art asphalt pavement structural strength detection apparatus;
FIG. 2 is a schematic diagram of the working state of a prior art asphalt pavement structural strength detection device;
FIG. 3 is a schematic view of the invention from the left front perspective;
fig. 4 is a schematic perspective view of the present invention from the right front;
FIG. 5 is a schematic view showing a state in which the specimen taking and placing rack is rotated upward by a certain angle;
FIG. 6 is an enlarged view of a portion of the specimen handling rack and the specimen handling rack rotation system;
FIG. 7 is a schematic view showing a state in which the transfer system transfers the test piece to the test piece taking and placing rack;
fig. 8 is a schematic view showing a state in which the specimen taking and placing rack feeds the specimen between the upper and lower pressing plates.
Detailed Description
As shown in fig. 3, 4, 5 and 6, the automatic detection device for the structural strength of the asphalt pavement provided by the invention comprises a pressurizing table 1, wherein the top surfaces of two ends of the pressurizing table are respectively provided with an upright post 2, the upper ends of the two upright posts are fixedly provided with a top plate 3, and the middle of the bottom surface of the top plate is provided with a pressure sensor 4; the middle of the top surface of the pressurizing table is provided with a pressurizing device 5, the top of the pressurizing device is provided with a lower pressing plate 6, the top surface of the lower pressing plate is provided with a lower pressing bar 7, an upper pressing plate 8 is arranged above the lower pressing plate, and the bottom surface of the upper pressing plate is provided with an upper pressing bar 9 which is opposite to the lower pressing bar; two ends of the lower pressing plate are respectively fixedly provided with a pressing plate guide rod 10, and the upper pressing plate 8 is movably sleeved on the two pressing plate guide rods 10; still include top board operating system, test piece get put system, test piece transport system and test piece centering system, wherein:
the upper pressing plate lifting system comprises two supporting rods 12 which vertically penetrate through two ends of the lower pressing plate 6, the supporting rods 12 are sleeves provided with internal threads, the lower pressing plate can slide up and down along the two supporting rods, the upper ends of the two supporting rods 12 are fixedly connected with the bottom surfaces of the two ends of the upper pressing plate 8, the lower ends of the two supporting rods are respectively connected with a height adjusting screw 13 through the internal threads in a threaded manner, the two height adjusting screws 13 are respectively connected with a first motor 14 which drives the height adjusting screws to rotate, and the two first motors 14 are fixed on the pressurizing table 1;
the test piece taking and placing system comprises a test piece taking and placing frame and a test piece taking and placing frame rotating system; the test piece taking and placing rack rotating system comprises a rod gear 16, two ends of a rotating shaft of the rod gear 16 are respectively inserted into two side walls of the mounting groove 15, and a second motor 17 for driving the rod gear to rotate is arranged on a rotating shaft at one end of the mounting groove; two vertical rods 18 are arranged in front of the rod-type gear, the lower ends of the two vertical rods 18 are respectively fixed on the bottom surface of the mounting groove 15, a cross beam 19 is rotatably arranged between the upper ends of the two vertical rods, two ends of the cross beam are respectively provided with a rotating shaft, the rotating shafts at the two ends of the cross beam 19 respectively penetrate through the outer sides of the two vertical rods and are respectively and fixedly connected with a driven gear 20, and the two driven gears 20 are respectively meshed with the rod-type gear 16; the test piece taking and placing frame comprises a first cross rod 21 and a second cross rod 22 which are parallel to the cross beam, a main connecting rod 23 which is perpendicular to the first cross rod and the second cross rod is fixedly connected between the first cross rod and the second cross rod, the main connecting rod 23 is a sleeve pipe provided with internal threads, a bracket lifting screw 24 which is perpendicular to the cross beam is arranged in the middle of the cross beam 19 in a penetrating way, one end of the bracket lifting screw 24 is positioned at one side of the cross beam, which faces towards the mounting groove, and is connected with a third motor 25 which drives the bracket lifting screw to rotate, and the other end of the bracket lifting screw 24 penetrates through the first cross rod and is in threaded connection with the internal threads of the main connecting rod 23; the side of the second cross bar 22, which is opposite to the first cross bar, is fixedly connected with 3 test piece receiving bars 26,3 which are parallel to the main connecting bar 23, and the test piece receiving bars are arranged in parallel and have a certain interval; the top surface of the second cross rod 22 is connected with two fixed supporting rods 27 perpendicular to the test piece receiving rod, the lower ends of the two fixed supporting rods 27 are fixedly connected with the second cross rod, one sides of the two fixed supporting rods, which face the test piece receiving rod, are longitudinally provided with a sliding groove 28 respectively, sliding supporting rods 29 parallel to the fixed supporting rods are arranged along the sliding groove, the sliding supporting rods 29 are provided with a sliding block which is limited in the sliding groove and can slide along the sliding groove, a sliding screw rod (the sliding block and the sliding screw rod are not shown in the drawing) is arranged in the sliding groove, the sliding screw rod is in threaded rotation connection with the sliding block, one end of the sliding screw rod penetrates through the bottom surface of the second cross rod, and a fourth motor 30 for driving the sliding screw rod to rotate is connected; the distance between the two sliding support rods 29 is smaller than the diameter of the asphalt pavement structural strength detection test piece, and a test piece push plate 31 is fixedly connected between the lower ends of the two sliding support rods 29;
the test piece conveying system comprises 4 small conveyor belts 32 which are arranged in parallel, a certain gap is reserved between every two adjacent conveyor belts, and 3 test piece receiving rods 26 of the test piece taking and placing frame are respectively positioned in the 3 gaps among the 4 conveyor belts along the direction parallel to the conveyor belts 32 in a horizontal state;
the test piece centering system comprises two clamping plates 33, wherein the two clamping plates 33 are perpendicular to the lower pressing plate 6 and are symmetrically arranged on two sides of the lower pressing bar 7 on the top surface of the lower pressing plate; two strip-shaped sliding holes 34 perpendicular to the lower pressing strips are respectively formed in the two sides of the lower pressing strips on the lower pressing plate, two sliding blocks 35 penetrating to the bottom surface of the lower pressing plate through the strip-shaped sliding holes are arranged at the bottom of each clamping plate, and each sliding block is fixedly connected with a nut 36 on the bottom surface of the lower pressing plate; two double-headed screws 37 are arranged on the bottom surface of the lower pressing plate along the direction parallel to the strip-shaped sliding holes, the screw thread directions of the two ends of the double-headed screws are opposite, and the two ends of each double-headed screw 37 are respectively in screw connection with two opposite nuts 36 at the bottoms of the two clamping plates; one end of each double-ended screw is also connected with a fifth motor 38 for driving the double-ended screw to rotate.
According to the structure, the upper pressing plate lifting system drives the height adjusting screw rod to rotate through the first motor, and the height of the supporting rod can be adjusted, so that the upper pressing plate is controlled to lift; the test piece taking and placing frame rotating system drives the rod-type gear to rotate through the second motor, and the rod-type gear drives the driven gear to rotate, so that the test piece taking and placing frame is driven to rotate, the test piece receiving rod of the test piece taking and placing frame can rotate from a horizontal state to a state perpendicular to a horizontal plane, and meanwhile, the fixed supporting rod and the sliding supporting rod rotate to the horizontal state due to the state perpendicular to the horizontal plane; when the test piece receiving rod is in a state of being vertical to the horizontal plane, the third motor drives the support lifting screw to rotate, the height of the test piece taking and placing frame is increased or decreased, and when the fixed supporting rod and the sliding supporting rod are in a horizontal state, the fourth motor drives the sliding screw to rotate, so that the sliding supporting rod slides back and forth along the fixed supporting rod; the fifth motor of the test piece centering system drives the double-headed screw to rotate, so that the two clamping plates are simultaneously close to each other and far away from each other.
In the practice of the present invention, the cross section of the support rod 12 may be configured to be non-circular in order to reduce the force on the upper end of the support rod as the height adjustment screw rotates.
The rod gear 16 adopted by the invention has a specific structure that a rod with a circular gear cross section is arranged, and two ends of the rod are respectively provided with a rotating shaft and are connected with two side walls of a mounting groove on the pressurizing table.
In the implementation of the invention, the driven gear 20 can adopt an arc gear, the arc gear is 1/4 to 1/2 of a round gear, and the circle centers of the arcs of the two arc gears are fixedly connected with the rotating shafts at the two ends of the cross beam respectively; one end of the arc gear is provided with a limiting block 39 which extends outwards along the radius of the arc for a certain length, when the test piece receiving rod 26 of the test piece taking and placing rack is in a horizontal state, the radian from the meshing part of the arc gear and the rod gear to the limiting block is 90 degrees, the maximum rotation angle of the arc gear is ensured to be 90 degrees, and the test piece receiving rod of the test piece taking and placing rack is prevented from continuing to rotate after rotating from the horizontal state to a state vertical to the horizontal plane.
In the implementation of the present invention, an auxiliary connecting rod 40 may be respectively disposed at two sides of the main connecting rod 23 between the first cross rod 21 and the second cross rod 22, the auxiliary connecting rod 40 is a sleeve with a cavity inside, two support lifting guide rods 41 are disposed on the cross beam 19, one ends of the two support lifting guide rods 41 are fixedly connected with the cross beam, and the other ends of the two support lifting guide rods are respectively movably inserted into the cavities of the two auxiliary connecting rods 40. The auxiliary connecting rod can be stressed together with the main connecting rod when the test piece taking and placing frame rotates, so that the structural strength of the test piece taking and placing frame is enhanced, and meanwhile, the lifting of the test piece taking and placing frame is guided.
When the invention is implemented, the sum of the thicknesses of the support rods and the sliding support rods is smaller than the height of the lower pressing strip.
When the invention is embodied, the centering system is arranged, and the test piece is clamped by the two clamping plates, so that the bottom surface of the upper pressing strip and the top surface of the lower pressing strip are outwards protruding cambered surfaces, the contact parts of the upper pressing strip and the lower pressing strip are in line contact, and the compressive strength of the test piece can be detected more accurately.
The working process of the invention is as follows:
as shown in fig. 7 and 8, the first motor 14 lifts the supporting rod 12 to lift the upper pressing plate 8 to a distance between the upper pressing plate 9 and the lower pressing plate 7 which is larger than the diameter of the test piece; the test piece receiving rod 26 of the test piece taking and placing frame is in a horizontal state, the test piece 11 is conveyed to the top surface of the test piece receiving rod 26 by the conveyor belt 32 in a posture that the axis is vertical to the test piece receiving rod, the driven wheel 20 is driven by the second motor 17 to rotate 90 degrees through the rod gear 16, the posture of the test piece is converted into a state of being supported by the sliding supporting rods 29 in two horizontal states, the height of the test piece taking and placing frame is adjusted by the third motor 25 through rotating the bracket lifting screw 24, the height of the bottom surface of the test piece is higher than the height of the top surface of the lower pressing strip on the lower pressing plate, the fourth motor 30 drives the two sliding supporting rods to slide forwards along the fixed supporting rods, and the test piece 11 is conveyed between the upper pressing plate 8 and the lower pressing plate 6 together with the sliding supporting rods through the push plate 31; then the third motor reduces the height of the test piece taking and placing frame until the test piece contacts with the lower pressing strip on the lower pressing plate, the fifth motor 38 drives the two clamping plates 33 of the centering system to move relatively to clamp the test piece, and at the moment, the connecting line between the central lines of the upper pressing strip and the lower pressing strip passes through the axis of the test piece, namely the test piece is completely centered; and then the two sliding support rods are withdrawn between the upper pressing plate and the lower pressing plate through the fourth motor 30, the pressurizing device 5 pushes the lower pressing plate 6 upwards, the test piece 11 is pressurized according to the regulations, and the maximum load data which can be born by the test piece is obtained.
After the test piece pressurization test is finished, the test piece is taken out according to the reverse sequence of the test piece conveying process between the upper pressing plate and the lower pressing plate, and is conveyed back to the test piece storage place through the conveying belt, and then the next test piece detection is carried out.
Claims (6)
1. The automatic detection device for the structural strength of the asphalt pavement comprises a pressurizing table, wherein the top surfaces of two ends of the pressurizing table are respectively provided with an upright post, the upper ends of the two upright posts are fixedly provided with a top plate, and a pressure sensor is arranged in the middle of the bottom surface of the top plate; a pressurizing device is arranged in the middle of the top surface of the pressurizing table, a lower pressing plate is arranged at the top of the pressurizing device, a lower pressing strip is arranged on the top surface of the lower pressing plate, an upper pressing plate is arranged above the lower pressing plate, and an upper pressing strip which is opposite to the lower pressing strip is arranged on the bottom surface of the upper pressing plate; two ends of the lower pressing plate are respectively fixedly provided with a guide rod, and the upper pressing plate is movably sleeved on the two guide rods, and is characterized in that: still include top board operating system, test piece get put system, test piece transport system and test piece centering system, wherein:
the upper pressing plate lifting system comprises two supporting rods which vertically penetrate through two ends of the lower pressing plate, the supporting rods are sleeves provided with internal threads, the lower pressing plate can slide up and down along the two supporting rods, the upper ends of the two supporting rods are fixedly connected with the bottom surfaces of the two ends of the upper pressing plate, the lower ends of the two supporting rods are respectively connected with a height adjusting screw rod through the internal threads in a threaded manner, the two height adjusting screw rods are respectively connected with a first motor which drives the height adjusting screw rods to rotate, and the two first motors are fixed on the pressurizing table;
the test piece taking and placing system comprises a test piece taking and placing frame and a test piece taking and placing frame rotating system; the test piece taking and placing rack rotating system comprises a rod gear, two ends of a rotating shaft of the rod gear are respectively inserted into two side walls of the mounting groove, and a second motor for driving the rod gear to rotate is arranged on a rotating shaft at one end of the mounting groove; two vertical rods are arranged in front of the rod-type gear, the lower ends of the two vertical rods are respectively fixed on the bottom surface of the mounting groove, a cross beam is rotatably arranged between the upper ends of the two vertical rods, two ends of the cross beam are respectively provided with a rotating shaft, the rotating shafts at the two ends of the cross beam respectively penetrate through the outer sides of the two vertical rods and are respectively and fixedly connected with a driven gear, and the two driven gears are respectively meshed with the rod-type gear; the test piece taking and placing frame comprises a first cross rod and a second cross rod which are parallel to the cross beam, a main connecting rod which is perpendicular to the first cross rod and the second cross rod is fixedly connected between the first cross rod and the second cross rod, the main connecting rod is a sleeve pipe provided with internal threads, a bracket lifting screw rod which is perpendicular to the cross beam is arranged in the middle of the cross beam in a penetrating way, one end of the bracket lifting screw rod is positioned at one side of the cross beam, which faces the mounting groove, and is connected with a third motor which drives the bracket lifting screw rod to rotate, and the other end of the bracket lifting screw rod penetrates through the first cross rod and is in threaded connection with the internal threads of the main connecting rod; the side, opposite to the first cross rod, of the second cross rod is fixedly connected with 3 test piece receiving rods parallel to the main connecting rod, and the 3 test piece receiving rods are arranged in parallel and have a certain interval; the top surface of the second cross rod is connected with two fixed supporting rods perpendicular to the test piece receiving rod, the lower ends of the two fixed supporting rods are fixedly connected with the second cross rod, one sides of the two fixed supporting rods, which face the test piece receiving rod, are longitudinally provided with a sliding groove respectively, sliding supporting rods parallel to the fixed supporting rods are arranged along the sliding groove, the sliding supporting rods are provided with a sliding block which is limited in the sliding groove and can slide along the sliding groove, a sliding screw rod is arranged in the sliding groove, the sliding screw rod is in threaded rotation connection with the sliding block, one end of the sliding screw rod penetrates through the bottom surface of the second cross rod, and is connected with a fourth motor for driving the sliding screw rod to rotate; the distance between the two sliding support rods is smaller than the diameter of the asphalt pavement structural strength detection test piece, and a test piece pushing plate is fixedly connected between the lower ends of the two sliding support rods; the sum of the thicknesses of the support rods and the sliding support rods is smaller than the height of the lower pressing strip;
the test piece conveying system comprises 4 small conveyor belts which are arranged in parallel, a certain gap is reserved between every two adjacent conveyor belts, and 3 test piece receiving rods of the test piece taking and placing frame are respectively positioned in the 3 gaps among the 4 conveyor belts along the direction parallel to the conveyor belts in a horizontal state;
the test piece centering system comprises two clamping plates, wherein the two clamping plates are perpendicular to the lower pressing plate and are symmetrically arranged on two sides of the lower pressing bar on the top surface of the lower pressing plate; two strip-shaped sliding holes perpendicular to the lower pressing strips are respectively formed in the two sides of the lower pressing strips on the lower pressing plate, two sliding blocks penetrating to the bottom surface of the lower pressing plate through the strip-shaped sliding holes are arranged at the bottom of each clamping plate, and each sliding block is fixedly connected with a nut on the bottom surface of the lower pressing plate; two double-headed screws are arranged on the bottom surface of the lower pressing plate along the direction parallel to the strip-shaped sliding holes, the screw thread directions of the two ends of the double-headed screws are opposite, and the two ends of each double-headed screw are respectively in screw connection with two opposite nuts at the bottoms of the two clamping plates; one end of each double-end screw is also connected with a fifth motor for driving the double-end screw to rotate.
2. The automatic detection device for structural strength of asphalt pavement according to claim 1, wherein: the cross section of the supporting rod is non-circular.
3. The automatic detection device for structural strength of asphalt pavement according to claim 1, wherein: the rod gear is a rod member with a round gear in cross section.
4. The automatic detection device for structural strength of asphalt pavement according to claim 1, wherein: the driven gear is an arc gear which is 1/4 to 1/2 of a round gear, and the circle centers of the two arc gears are fixedly connected with the rotating shafts at the two ends of the cross beam respectively; one end of the arc gear is provided with a limiting block which extends outwards along the radius of the arc, and the radian from the meshing part of the arc gear and the rod gear to the limiting block is 90 degrees when the test piece receiving rod of the test piece taking and placing rack is in a horizontal state.
5. The automatic detection device for structural strength of asphalt pavement according to claim 1, wherein: an auxiliary connecting rod is respectively arranged on two sides of the main connecting rod between the first cross rod and the second cross rod, the auxiliary connecting rod is a sleeve with a cavity inside, two support lifting guide rods are arranged on the cross beam, one ends of the two support lifting guide rods are fixedly connected with the cross beam, and the other ends of the two support lifting guide rods are respectively movably inserted into the cavities of the two auxiliary connecting rods.
6. The automatic detection device for structural strength of asphalt pavement according to claim 1, wherein: the bottom surface of the upper pressing strip and the top surface of the lower pressing strip are cambered surfaces protruding outwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045010.3A CN113758802B (en) | 2021-09-07 | 2021-09-07 | Automatic detection device for structural strength of asphalt pavement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045010.3A CN113758802B (en) | 2021-09-07 | 2021-09-07 | Automatic detection device for structural strength of asphalt pavement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113758802A CN113758802A (en) | 2021-12-07 |
| CN113758802B true CN113758802B (en) | 2023-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111045010.3A Active CN113758802B (en) | 2021-09-07 | 2021-09-07 | Automatic detection device for structural strength of asphalt pavement |
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| CN (1) | CN113758802B (en) |
Citations (9)
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