Asphalt pavement asphalt content detection device

Abstract

The invention relates to the technical field of asphalt pavement construction, and discloses an asphalt pavement asphalt content detection device which comprises a supporting moving assembly, a sampling barrel, a first sampling hole and a second sampling hole, the first sampling hole and the second sampling hole are formed in the sampling barrel, a driving downward moving assembly is arranged in the supporting moving assembly, and the driving downward moving assembly is fixedly connected with the outer wall of the sampling barrel; a sampling pipe slidably penetrates through the inner wall of the first sampling hole, the upper end of the sampling pipe penetrates out of the sampling barrel and extends to the outside, a one-way sampling feeding mechanism is arranged at the lower end in the sampling pipe, a supporting frame is fixedly arranged at the upper end of the outer wall of the sampling barrel, an electric push rod is fixedly arranged at the top of the supporting frame, and a control motor is fixedly arranged at the tail end of an output shaft of the electric push rod; a rotating rod is fixedly arranged on an output shaft of the control motor. According to the asphalt content detection device for the asphalt pavement, different sampling operations can be adopted according to internal sampling extension of the asphalt pavement, multi-point convenient sampling of the asphalt pavement is realized, and the asphalt content detection precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt pavement construction, in particular to an asphalt content detection device for an asphalt pavement. Background Art

[0002] Asphalt is the binder in asphalt mixture. The appropriate asphalt content can ensure that the mixture has sufficient bonding strength and that the aggregate particles are tightly bonded. In order to ensure that the road surface has sufficient bearing capacity and stability, it is necessary to effectively test the asphalt content inside the road surface during the asphalt filter cotton construction process.

[0003] At present, for the detection of asphalt content inside asphalt, the corresponding detection components are generally extended into the interior of the road surface for sampling. For example, the patent document with announcement number CN219391475U discloses an asphalt content detection device for asphalt road surface. The detection device first controls the extension and retraction of the first telescopic component through the control panel, so that the metal temperature sensing probe is extended into the asphalt layer to detect the temperature. When the temperature reaches the specified temperature, the second drive motor is controlled to drive the sampling component to move downward to the asphalt layer or to a depth of cm or even several millimeters. At this time, the second telescopic component is controlled to drive the first piston and the second piston to move upward to extract the asphalt into the storage hole. After the extraction is completed, the rotating motor is controlled to drive the bottom plate to rotate, so that the storage hole and the sampling hole are misaligned, thereby preventing the asphalt in the storage hole from leaking.

[0004] However, the above device has the following defects when used: First, since the bottom of the sampling component is flat, it is difficult to insert the sampling component into the road surface. At the same time, since the internal viscosity of the asphalt pavement increases in the later stage of formation, the extraction effect is poor only by the piston, and the sampling volume is small. Secondly, since the asphalt pavement is a multi-layer structure composed of asphalt binder, aggregate, etc., the surface aggregate is distributed relatively loosely, making it easier to sample and test. However, the deep layer of the pavement has a relatively tight internal structure due to the long-term compaction of vehicle loads, making it impossible for the sampling component to continuously and stably extend into the interior of the pavement for deep sampling, which reduces the sampling effect and makes it impossible to perform multi-point more accurate sampling and testing on the asphalt pavement, reducing the detection effect. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides an asphalt pavement asphalt content detection device that can extend deep into the asphalt pavement for rapid sampling and detection, thereby improving detection accuracy and solving the problem that the prior device cannot extend deep into the asphalt for rapid sampling.

[0006] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an asphalt content detection device for an asphalt pavement, comprising a supporting and moving assembly, a sampling barrel, and a first sampling hole and a second sampling hole opened inside the sampling barrel, wherein a driving and moving assembly is provided inside the supporting and moving assembly, and the driving and moving assembly is fixedly connected to the outer wall of the sampling barrel; A sampling tube is slidably penetrated through the inner wall of the first sampling hole, the upper end of the sampling tube passes through the sampling barrel and extends to the outside, and a one-way sampling and feeding mechanism is provided at the inner lower end of the sampling tube; A support frame is fixedly provided at the upper end of the outer wall of the sampling barrel, an electric push rod is fixedly provided on the top of the support frame, a control motor is fixedly provided at the end of the output shaft of the electric push rod, a rotating rod is fixedly provided on the output shaft of the control motor, a rod wall of the rotating rod extends into the second sampling hole, and a spiral conveying blade is fixedly provided thereon; Grooves are provided on both sides of the lower end of the sampling barrel, and a control sampling mechanism is provided inside the grooves.

[0007] Preferably, the control sampling mechanism comprises a mounting shell, the mounting shell is Zenerly arranged in the groove, a pressure sensor is fixedly arranged on the inner wall of the mounting shell, an extrusion airbag is fixedly embedded at the opening of the mounting shell, and the extrusion airbag contacts and cooperates with the detection end of the pressure sensor; A PLC controller is fixedly provided at the upper end of the side of the support frame. The PLC controller and the pressure sensor are connected by a control cable. The extrusion airbag can accurately sense the pressure change and transmit the pressure signal to the pressure sensor. The electric push rod and the control motor are controlled by the PLC controller, so that the sampling barrel can rotate and sample after entering deep into the asphalt, so that the spiral conveying blade can be quickly inserted for stable sampling, thereby improving the versatility of sampling.

[0008] Preferably, the driving downward moving assembly includes a control electric cylinder and a support plate, the control electric cylinder is fixedly arranged on the top of the support plate, the end of the output shaft of the control electric cylinder is fixedly provided with a drive plate, and the drive plate is fixedly sleeved on the outer lower end of the sampling barrel.

[0009] Preferably, the supporting movable assembly includes a movable frame, the lower end of the upper side of the movable frame is fixedly connected to the supporting plate, a plurality of universal wheels are fixedly provided at the bottom of the movable frame, and the plurality of universal wheels are arranged in a triangular symmetrical manner. The universal wheels and the movable frame can stably support the entire device, making it convenient to move the device to any position for rapid sampling and detection.

[0010] Preferably, the one-way sampling and feeding mechanism comprises two symmetrically arranged one-way cover plates, the two one-way cover plates are both arranged at the lower end of the inner line of the sampling tube, the two one-way cover plates are hingedly matched with the inner wall of the sampling tube on the sides away from each other, and the bottoms of the two one-way cover plates are both in contact with a limit plate, and the limit plate is fixedly connected to the bottom of the sampling tube. Under the action of extrusion, after the asphalt sample enters the sampling tube, the one-way cover plate cannot rotate downward under the support of the limit plate, and the asphalt sample in the sampling tube is stably supported and preserved; An extraction detection mechanism for limiting the position of the sampling tube is provided between the upper end of the sampling tube and the top of the sampling barrel.

[0011] Preferably, the extraction and detection mechanism includes a vertical rod, a torsion spring and a clamping plate, an annular clamping groove is opened at the outer upper end of the sampling tube, the vertical rod is fixedly arranged on the top of the sampling barrel, the clamping plate is rotatably sleeved on the outer side of the vertical rod, the end of the clamping plate away from the vertical rod is arranged in an arc shape, and is clamped in the annular clamping groove, the torsion spring is sleeved on the outer side of the vertical rod, and the two ends of the torsion spring are respectively fixedly connected to the vertical rod and the clamping plate, and the plug-in cooperation of the clamping plate and the annular clamping groove can fix the position of the sampling tube, so that the sampling tube can maintain stability during the sampling process, and after the sampling is completed, it can be away from the sampling barrel and the internal sample can be taken out for rapid testing.

[0012] Preferably, a material blocking ring is fixedly provided on the top of the sampling barrel, and the material blocking ring is sleeved on the outer side of the spiral conveying blade. The PLC controller is connected and cooperated with the electric push rod and the control motor through cables, so that various signals can be effectively transmitted to complete convenient sampling.

[0013] Preferably, the mounting shell and the sampling barrel are screwed together with bolts, and the longitudinal section of the extrusion airbag is elliptical. Since the air content inside the airbag is fixed, the elliptical setting can enable one side of the airbag to be squeezed and the other side to fail, thereby pushing the pressure sensor, making it easier for the pressure sensor to monitor the pressure signal in time and control the rotation and extension of the spiral conveying blade.

[0014] (III) Beneficial effects Compared with the prior art, the present invention provides a device for detecting asphalt content in asphalt pavement, which has the following beneficial effects: 1. Through the sampling barrel, the first sampling hole, the second sampling hole, the support frame, the electric push rod, the control motor, the spiral conveying blade and the control sampling mechanism, as the sampling barrel is extended into the asphalt, when it enters the surface layer of the road surface, the sampling barrel is moved down and squeezed to make the sample enter the sampling tube to complete the sampling. As the insertion distance of the sampling barrel increases, the insertion pressure is monitored by the pressure sensor, and when the pressure gradually increases, the spiral conveying blade is controlled to move down and extend into the road surface, so that the deep sample is spirally conveyed out of the sampling barrel, which improves the diversity of asphalt sampling inside the asphalt, thereby improving the detection accuracy.

[0015] 2. The sampling position of the sampling tube is determined by the sampling tube, the one-way sampling feeding mechanism and the extraction and detection mechanism, and the one-way sampling feeding mechanism can prevent the sample from falling after it enters the sampling tube by squeezing. After the sampling tube is taken out of the sampling barrel, the internal sample can be quickly taken out and tested, thereby improving the stability of sample extraction; 3. Through the support moving component and the driving downward moving component, the whole device can be conveniently moved through the support moving component, so that multi-point sampling of the asphalt pavement can be carried out. At the same time, the driving downward moving component can control the longitudinal movement of the sampling barrel to enter the interior of the pavement for rapid sampling of asphalt samples, thereby improving the convenience of sampling work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an asphalt content detection device for an asphalt pavement proposed by the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the sampling barrel in the present invention; Figure 3 for Figure 1 Internal cross-sectional view of the middle sampling barrel; Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the sampling tube; Figure 5 for Figure 2 A schematic diagram of the top view of the sampling barrel; Figure 6 for Figure 1 Schematic diagram of the internal structure of the central control sampling mechanism.

[0017] In the figure: 1 sampling barrel, 2 first sampling hole, 3 second sampling hole, 4 sampling tube, 5 support frame, 6 electric push rod, 7 control motor, 8 rotating rod, 9 spiral conveying blade, 10 mounting shell, 11 pressure sensor, 12 extrusion airbag, 13 PLC controller, 14 control electric cylinder, 15 support plate, 16 driving plate, 17 moving frame, 18 universal wheel, 19 one-way cover plate, 20 limit plate, 21 vertical rod, 22 torsion spring, 23 clamping plate, 24 annular clamping groove, 25 baffle ring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0019] See also Figure 1-6 , an asphalt content detection device for an asphalt pavement, comprising a supporting moving component, a sampling barrel 1, and a first sampling hole 2 and a second sampling hole 3 opened inside the sampling barrel 1, a driving downward moving component is arranged inside the supporting moving component, the driving downward moving component is fixedly connected to the outer wall of the sampling barrel 1, a sampling tube 4 is slidably penetrated through the inner wall of the first sampling hole 2, the upper end of the sampling tube 4 passes through the sampling barrel 1 and extends to the outside, and a one-way sampling and feeding mechanism is arranged at the lower end of the inner part of the sampling tube 4; A support frame 5 is fixedly provided at the upper end of the outer wall of the sampling barrel 1, an electric push rod 6 is fixedly provided at the top of the support frame 5, a control motor 7 is fixedly provided at the end of the output shaft of the electric push rod 6, a rotating rod 8 is fixedly provided at the output shaft of the control motor 7, the rod wall of the rotating rod 8 extends into the second sampling hole 3, and a spiral conveying blade 9 is fixedly provided; Grooves are provided on both sides of the lower end of the sampling barrel 1, and a control sampling mechanism is provided inside the groove. The control sampling mechanism includes a mounting shell 10, and the mounting shell 10 is Zener-mounted in the groove. A pressure sensor 11 is fixedly provided on the inner wall of the mounting shell 10, and an extrusion airbag 12 is fixedly embedded at the opening of the mounting shell 10. The mounting shell 10 and the sampling barrel 1 are screwed together by bolts. The longitudinal section of the extrusion airbag 12 is elliptical, and the extrusion airbag 12 contacts and cooperates with the detection end of the pressure sensor 11. A PLC controller 13 is fixedly provided on the upper end of the side of the support frame 5, and the PLC controller 13 and the pressure sensor 11 are connected by a control cable. A material blocking ring 25 is fixedly provided on the top of the sampling barrel 1, and the material blocking ring 25 is sleeved on the outer side of the spiral conveying blade 9. The PLC controller 13 is connected and cooperated with the electric push rod 6 and the control motor 7 through cables.

[0020] When sampling, first move the device to the designated position, then drive the sampling barrel 1 downward, so that the bottom of the sampling barrel 1 is slowly inserted into the surface layer of the asphalt, and as the sampling barrel 1 is inserted, under the action of squeezing, part of the internal aggregate of the asphalt passes through the first sampling hole 2 and enters the sampling tube 4 for collection, and as the bottom of the sampling barrel 1 continues to extend, since the deep inside of the asphalt is compacted more tightly under the action of the load, the internal asphalt squeezes the outer wall of the sampling barrel 1 during the penetration of the sampling barrel 1, and the squeezing effect is transmitted to the squeezing airbag 12, and the air content inside the squeezing airbag 12 is fixed, so that when the outer side of the squeezing airbag 12 is squeezed, the inner side of the squeezing airbag 12 expands outward to squeeze the pressure sensor 11, so that the pressure sensor 11 monitors the pressure signal and transmits the pressure signal to the PLC controller 13 through the control cable, so that the PLC controller 13 transmits the control signal to the control motor 6 and the electric push rod 7, so that the control motor 6 drives the rotating rod 8 and the spiral conveying blade 9 to rotate, and the deep sampling barrel 1 is pushed by the electric push rod 7. At this time, the sampling barrel 1 is fixed in position, and the spiral conveying blade 9 slowly moves down and quickly inserts into the deep asphalt under the action of the spiral. At this time, under the rotation of the spiral conveying blade 9, the deep asphalt moves slowly upward through the conveying blade and moves to the retaining ring 25, thereby completing the sampling work. After the multi-point sampling is completed, the sampling barrel 1 moves up, and as the pressure decreases, the pressure sensor 11 does not detect the pressure and controls the spiral conveying blade 9 to move up and return to its original position.

[0021] In order to enable the device to move to the designated sampling position, the sampling barrel 1 can slowly penetrate into the asphalt to take samples, and Figure 1-3 As shown, the supporting moving assembly includes a moving frame 17, the upper lower end of the moving frame 17 is fixedly connected to the supporting plate 15, a plurality of universal wheels 18 are fixedly provided at the bottom of the moving frame 17, and the plurality of universal wheels 18 are arranged in a triangular symmetry. The driving downward moving assembly includes a control electric cylinder 14 and a supporting plate 15, the control electric cylinder 14 is fixedly provided on the top of the supporting plate 15, a driving plate 16 is fixedly provided at the end of the output shaft of the control electric cylinder 14, and the driving plate 16 is fixedly sleeved on the outer lower end of the sampling barrel 1.

[0022] Before sampling, the device can be moved to the surface of the asphalt pavement and to the designated sampling position by the support of the mobile frame 17 and the multiple universal wheels 18 at the bottom. At the beginning of the detection, the drive plate 16 is pushed by controlling the start of the electric cylinder 14. Since the drive plate 16 is connected to the sampling barrel 1, the sampling barrel 1 can be stably moved downward and inserted into the asphalt to perform sampling and subsequent rapid detection.

[0023] In order to preserve the samples stably and take them out for convenient testing after sampling, Figure 3-5As shown, the one-way sampling and feeding mechanism includes two symmetrically arranged one-way cover plates 19, both of which are arranged at the lower end of the inner line of the sampling tube 4, and the two one-way cover plates 19 are hingedly matched with the inner wall of the sampling tube 4 on the sides away from each other, and the bottoms of the two one-way cover plates 19 are both in contact with a limit plate 20, and the limit plate 20 is fixedly connected to the bottom of the sampling tube 4; An extraction detection mechanism for limiting the position of the sampling tube 4 is provided between the upper end of the sampling tube 4 and the top of the sampling barrel 1. The extraction detection mechanism includes a vertical rod 21, a torsion spring 22 and a clamping plate 23. An annular clamping groove 24 is provided at the outer upper end of the sampling tube 4. The vertical rod 21 is fixedly arranged on the top of the sampling barrel 1. The clamping plate 23 is rotatably sleeved on the outer side of the vertical rod 21. The end of the clamping plate 23 away from the vertical rod 21 is arranged in an arc shape and is clamped in the annular clamping groove 25. The torsion spring 22 is sleeved on the outer side of the vertical rod 21. The two ends of the torsion spring 22 are respectively fixedly connected to the vertical rod 21 and the clamping plate 23.

[0024] When the sampling barrel 1 is inserted into the road surface, the sampling barrel 1 is in close contact with the inside of the road surface, and the first sampling hole 2 is opened. At this time, under the action of squeezing, the asphalt sample slowly enters the sampling hole 2 and pushes the one-way cover 19. At this time, the sample enters the sampling tube 4. After the sampling work is completed, the card plate 23 can be pushed so that the card plate 23 rotates around the vertical rod 21 and twists the torsion spring 22 at the same time. At this time, the card plate 23 is pulled out of the annular groove 24, so that the sampling tube 4 is not restricted and can be pulled out from the first sampling hole 2. During the pulling out process of the sampling tube 4, the one-way cover 19 is supported by the bottom limit plate 20 and cannot rotate downward. At this time, the asphalt sample in the sampling tube 4 cannot fall and is effectively preserved, which is convenient for the subsequent removal of the sample for stable testing.

[0025] In summary, when the asphalt pavement asphalt content detection device is used, the device can be moved to the surface of the asphalt pavement and to the designated sampling position by the mobile support of the mobile frame 17 and the plurality of universal wheels 18 at the bottom. When the detection starts, the driving plate 16 is pushed by controlling the start of the electric cylinder 14. Since the driving plate 16 is connected to the sampling barrel 1, the sampling barrel 1 can move downward stably at this time, so that the bottom of the sampling barrel 1 is slowly inserted into the surface layer of the asphalt. As the sampling barrel 1 is inserted, under the action of squeezing, part of the internal aggregate of the asphalt passes through the first sampling hole 2 and enters the sampling tube 4 to be collected. As the bottom of the sampling barrel 1 continues to extend, the asphalt is compacted more tightly under the action of the load, so that during the penetration of the sampling barrel 1, the internal asphalt squeezes the outer wall of the sampling barrel 1 and transmits the squeezing effect to the squeezing airbag 12. The air content inside the squeezing airbag 12 is fixed, so that when the outer side of the squeezing airbag 12 is squeezed, the inner side of the squeezing airbag 12 expands outward to squeeze the pressure sensor 11, so that the pressure sensor 11 The pressure signal is monitored and transmitted to the PLC controller 13 through the control cable, so that the PLC controller 13 transmits the control signal to the control motor 6 and the electric push rod 7, so that the control motor 6 drives the rotating rod 8 and the spiral conveying blade 9 to rotate, and the deep sampling barrel 1 is pushed by the electric push rod 7. At this time, the sampling barrel 1 is fixed, and the spiral conveying blade 9 slowly moves down and quickly inserts into the deep asphalt under the action of the spiral. At this time, under the rotation of the spiral conveying blade 9, the deep asphalt moves to the material blocking ring 25 through the slow upward movement of the conveying blade, thereby completing the sampling work. After the multi-point sampling is completed, the sampling barrel 1 moves up, and as the pressure decreases, the pressure sensor 11 does not detect the pressure and controls the spiral conveying blade 9 to move up and return to its original position; When the sampling barrel 1 is inserted into the road surface, the sampling barrel 1 is in close contact with the inside of the road surface, and the first sampling hole 2 is opened. At this time, under the action of squeezing, the asphalt sample slowly enters the sampling hole 2 and pushes the one-way cover 19. At this time, the sample enters the sampling tube 4. After the sampling work is completed, the card plate 23 can be pushed to rotate the card plate 23 around the vertical rod 21 and twist the torsion spring 22 at the same time. At this time, the card plate 23 is pulled out of the annular groove 24, so that the sampling tube 4 is not restricted and can be pulled out from the first sampling hole 2. During the pulling out process of the sampling tube 4, the one-way cover 19 is supported by the bottom limit plate 20 and cannot rotate downward. At this time, the asphalt sample in the sampling tube 4 cannot fall and is effectively preserved, which is convenient for the subsequent removal of the sample for stable testing.

[0026] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An asphalt content detection device for an asphalt pavement, comprising a supporting moving assembly, a sampling barrel (1), and a first sampling hole (2) and a second sampling hole (3) provided inside the sampling barrel (1), characterized in that: A driving downward moving assembly is provided inside the supporting moving assembly, and the driving downward moving assembly is fixedly connected to the outer wall of the sampling barrel (1); A sampling tube (4) is slidably penetrated through the inner wall of the first sampling hole (2), the upper end of the sampling tube (4) passes through the sampling barrel (1) and extends to the outside, and a one-way sampling and feeding mechanism is provided at the lower end of the interior of the sampling tube (4); A support frame (5) is fixedly provided at the upper end of the outer wall of the sampling barrel (1), an electric push rod (6) is fixedly provided at the top of the support frame (5), a control motor (7) is fixedly provided at the end of the output shaft of the electric push rod (6), a rotating rod (8) is fixedly provided at the output shaft of the control motor (7), a rod wall of the rotating rod (8) extends into the second sampling hole (3) and is fixedly sleeved with a spiral conveying blade (9); Grooves are provided on both sides of the lower end of the sampling barrel (1), and a control sampling mechanism is provided inside the groove.

2. The asphalt content detection device for asphalt pavement according to claim 1 is characterized by: The control sampling mechanism comprises a mounting shell (10), the mounting shell (10) is Zener-mounted in the groove, a pressure sensor (11) is fixedly mounted on the inner wall of the mounting shell (10), an extrusion airbag (12) is fixedly embedded at the opening of the mounting shell (10), and the extrusion airbag (12) contacts and cooperates with a detection end of the pressure sensor (11); A PLC controller (13) is fixedly provided on the upper end of the side of the support frame (5), and the PLC controller (13) and the pressure sensor (11) are connected by a control cable.

3. The asphalt content detection device for asphalt pavement according to claim 1 is characterized by: The driving downward movement assembly comprises a control electric cylinder (14) and a support plate (15), wherein the control electric cylinder (14) is fixedly arranged on the top of the support plate (15), and a drive plate (16) is fixedly arranged at the end of the output shaft of the control electric cylinder (14), and the drive plate (16) is fixedly sleeved on the outer lower end of the sampling barrel (1).

4. The asphalt content detection device for asphalt pavement according to claim 1 is characterized by: The supporting moving assembly comprises a moving frame (17), the lower end of the upper side of the moving frame (17) being fixedly connected to the supporting plate (15), and a plurality of universal wheels (18) being fixedly provided at the bottom of the moving frame (17), the plurality of universal wheels (18) being arranged in a triangular symmetry.

5. The asphalt content detection device for asphalt pavement according to claim 1 is characterized by: The one-way sampling and feeding mechanism comprises two symmetrically arranged one-way cover plates (19), the two one-way cover plates (19) are both arranged at the lower end of the inner line of the sampling tube (4), the two one-way cover plates (19) are both hingedly matched with the inner wall of the sampling tube (4) on the sides away from each other, and the bottoms of the two one-way cover plates (19) are both in contact with a limit plate (20), and the limit plate (20) is fixedly connected to the bottom of the sampling tube (4); An extraction detection mechanism for limiting the position of the sampling tube (4) is provided between the upper end of the sampling tube (4) and the top of the sampling barrel (1).

6. The asphalt content detection device for asphalt pavement according to claim 5 is characterized by: The extraction detection mechanism comprises a vertical rod (21), a torsion spring (22) and a clamping plate (23); an annular clamping groove (24) is provided at the outer upper end of the sampling tube (4); the vertical rod (21) is fixedly arranged on the top of the sampling barrel (1); the clamping plate (23) is rotatably sleeved on the outer side of the vertical rod (21); one end of the clamping plate (23) away from the vertical rod (21) is arranged in an arc shape and is clamped in the annular clamping groove (25); the torsion spring (22) is sleeved on the outer side of the vertical rod (21); and the two ends of the torsion spring (22) are respectively fixedly connected to the vertical rod (21) and the clamping plate (23).

7. The asphalt content detection device for asphalt pavement according to claim 2 is characterized by: A material blocking ring (25) is fixedly provided on the top of the sampling barrel (1), and the material blocking ring (25) is sleeved on the outer side of the spiral conveying blade (9). The PLC controller (13) is connected to the electric push rod (6) and the control motor (7) via cables.

8. The asphalt content detection device for asphalt pavement according to claim 2 is characterized by: The mounting shell (10) and the sampling barrel (1) are fixed by bolts, and the longitudinal section of the extrusion airbag (12) is elliptical.

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