A device for detecting the thickness of road concrete

Abstract

This invention provides a road concrete thickness detection device, belonging to the field of concrete road testing technology. The road concrete thickness detection device provided in this embodiment includes a positioning platform, a concrete core sampling mechanism, a lifting drive mechanism, and a thickness measurement component. The concrete core sampling mechanism is movably mounted on the positioning platform, and the lifting drive mechanism is also mounted on the positioning platform. The power output end of the lifting drive mechanism is connected to the concrete core sampling mechanism, enabling the lifting drive mechanism to drive the concrete core sampling mechanism to move up and down. This road concrete thickness detection device eliminates the need for hammering to remove the columnar concrete core sample from the core sampling cylinder, allowing direct measurement of the thickness of the columnar concrete core sample inside the core sampling cylinder. This effectively avoids the problem that hammering to remove the columnar concrete core sample easily causes breakage, affecting the accuracy of the concrete thickness measurement.

Description

Technical Field

[0001] This utility model belongs to the technical field of concrete road testing equipment, and in particular, relates to a road concrete thickness testing device. Background Technology

[0002] Before construction, the thickness, hardness, and other parameters of the concrete are often limited to ensure the quality of the concrete road construction. Therefore, after the concrete road construction is completed, a method of drilling core samples at multiple points along selected road sections is typically used to accurately measure the thickness of the concrete.

[0003] Currently, core sampling is typically performed on concrete roads using a core drill with a cutter head. As the motor drives the core drill to rotate, the cutter head cuts the concrete, gradually collecting the columnar concrete core sample inside the drill. However, when it's necessary to measure the thickness of the columnar concrete core sample, the cutter head usually needs to be removed from the core drill, and the sample needs to be forced out of the drill by tapping. However, tapping can easily break the columnar concrete core sample, affecting the accuracy of the concrete thickness measurement. Utility Model Content

[0004] Based on the aforementioned problems in the prior art, the purpose of this utility model embodiment is to provide a road concrete thickness detection device that can directly detect concrete thickness without removing the columnar concrete core sample from the core sampling tube, thereby solving the technical problem in the prior art where removing the columnar concrete core sample from the core sampling tube by tapping easily causes the columnar concrete core sample to break, affecting the accuracy of concrete thickness detection.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a road concrete thickness detection device, comprising:

[0006] Positioning platform;

[0007] The concrete core sampling mechanism is mounted on the positioning platform and can move up and down.

[0008] A lifting drive mechanism is mounted on the positioning platform. The power output end of the lifting drive mechanism is connected to the concrete core sampling mechanism, enabling the lifting drive mechanism to drive the concrete core sampling mechanism to move up and down.

[0009] A thickness measuring component is used to measure the thickness of the concrete core sample taken out by the concrete core sampling mechanism;

[0010] The concrete core sampling mechanism includes a lifting platform that can move up and down inside the positioning frame, a core sampling cylinder that is rotatably mounted on the lifting platform and vertically positioned, a cutter head fixedly mounted at the bottom opening of the core sampling cylinder, and a drive motor that drives the core sampling cylinder to rotate. The drive motor is fixedly mounted on the lifting platform. The thickness measuring component includes a fixed seat at the top opening of the core sampling cylinder, a rigid piston slidably mounted in the core sampling cylinder, a sliding rod inserted in the core sampling cylinder, and a graduated rod-shaped measuring ruler. The fixed seat has a sliding hole for slidingly mounting the sliding rod. The first end of the sliding rod is located inside the core sampling cylinder and connected to the rigid piston. The second end of the sliding rod passes through the sliding hole and extends outside the core sampling cylinder. The outer circumferential surface of the sliding rod slides in contact with the inner wall of the sliding hole. The bottom end of the rod-shaped measuring ruler is connected to the sliding rod. The bottom surface of the rigid piston is flush with the bottom end surface of the core sampling cylinder.

[0011] Furthermore, the road concrete thickness detection device also includes a guide assembly for guiding the lifting platform to move up and down. The guide assembly includes multiple guide cylinders connected to the lifting platform and multiple guide columns connected to the positioning frame. The guide columns and guide cylinders are arranged in a one-to-one correspondence. The axial direction of each guide column is parallel to the axial direction of the core sampling cylinder, and each guide cylinder is slidably fitted onto the corresponding guide column.

[0012] Furthermore, the multiple guide columns are distributed at circumferential intervals along the lifting platform.

[0013] Furthermore, the positioning platform includes a first positioning platform for supporting and positioning on the concrete road surface, a plurality of vertical support columns arranged vertically and at intervals on the first positioning platform, and a second positioning platform arranged parallel to and at intervals with the first positioning platform. The plurality of vertical support columns are respectively fixedly connected to the second positioning platform. The first positioning platform is provided with a first through hole for the core-taking cylinder and / or the cylinder cutter head to pass through.

[0014] Furthermore, the road concrete thickness detection device also includes an elastic component for elastically lifting the lifting platform toward the second positioning platform, wherein the first end of the elastic component abuts against the first positioning platform, and the second end of the elastic component abuts against the lifting platform and / or the guide cylinder.

[0015] Furthermore, the elastic component includes a plurality of first helical springs, each of which is correspondingly arranged with a guide post. Each first helical spring is sleeved on the corresponding guide post, with the first end of each first helical spring abutting against the first positioning platform and the second end of each first helical spring abutting against the bottom end of the lifting platform and / or the corresponding guide cylinder.

[0016] Furthermore, the lifting drive mechanism includes multiple electric cylinders, the cylinder body of each electric cylinder is fixedly connected to the positioning platform, and the telescopic rod of each electric cylinder is connected to the lifting platform.

[0017] Furthermore, the concrete core sampling mechanism also includes a gear transmission mechanism that drives the motor shaft of the drive motor to the core sampling cylinder. The gear transmission mechanism includes a driven gear fixedly mounted on the core sampling cylinder and / or the fixed base and a driving gear fixedly mounted on the motor shaft of the drive motor. The driving gear meshes with the driven gear.

[0018] Furthermore, the number of driving gears is set to be multiple, and the number of drive motors is the same as the number of driving gears. The driving gears are arranged in a one-to-one correspondence with the drive motors, and each driving gear is fixedly mounted on the motor shaft of the corresponding drive motor. The multiple driving gears mesh with the driven gears respectively.

[0019] Furthermore, the thickness measuring assembly also includes a second helical spring for elastically abutting the rigid piston toward the bottom opening of the core sample tube, and a movable ring plate slidably fitted on the sliding rod and located in the core sample tube. The first end of the second helical spring abuts against the rigid piston, and the second end of the second helical spring abuts against the movable ring plate, which abuts against the fixed seat.

[0020] Compared with the prior art, one or more technical solutions in the embodiments of this utility model have at least one of the following beneficial effects:

[0021] In this embodiment of the road concrete thickness detection device, after the core sampling mechanism obtains a complete columnar concrete core sample, the entire core sampling mechanism is moved above the concrete road surface by a lifting drive mechanism. The core sampler head is then detached from the core sampling cylinder. The entire device is then moved to a flat concrete road surface, and the lifting drive mechanism drives the core sampling mechanism downwards until the bottom surface of the core sampling cylinder is flush with the concrete road surface. At this point, the bottom of the columnar concrete core sample inside the core sampling cylinder rests against the concrete road surface. During this process, the distance the columnar concrete core sample moves to push the rigid piston can be measured using a rod-shaped measuring ruler. This distance is equal to the thickness of the columnar concrete core sample inside the core sampling cylinder. This eliminates the need for hammering to remove the columnar concrete core sample from the core sampling cylinder, allowing direct measurement of its thickness. This effectively avoids the problem of sample breakage and inaccurate concrete thickness detection caused by hammering. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A three-dimensional structural schematic diagram of the road concrete thickness detection device provided by this utility model;

[0024] Figure 2 A cross-sectional structural schematic diagram of the road concrete thickness detection device provided by this utility model;

[0025] Figure 3 A three-dimensional structural diagram of the positioning platform provided by this utility model;

[0026] Figure 4 A three-dimensional structural schematic diagram of the concrete core sampling mechanism provided by this utility model;

[0027] Figure 5 An assembly drawing of the thickness measuring component provided by this utility model;

[0028] Figure 6 Assembly drawing of the concrete core sampling mechanism and thickness measurement component provided by this utility model;

[0029] Figure 7 for Figure 6 A cross-sectional view of the concrete core sampling mechanism and thickness measurement components in their initial state;

[0030] Figure 8 for Figure 6 A cross-sectional view of the concrete core sampling mechanism and thickness measurement component in measurement mode;

[0031] Figure 9 An exploded view of the road concrete thickness detection device provided by this utility model.

[0032] The following are the labeling elements in the figure:

[0033] 1-Positioning platform; 11-First positioning platform; 12-Vertical support column; 13-Second positioning platform; 14-First through hole; 15-Second through hole;

[0034] 2-Concrete coring mechanism; 21-Lifting platform; 22-Coring cylinder; 23-Cylinder cutter head; 24-Drive motor; 25-Gear transmission mechanism; 251-Driven gear; 252-Driving gear;

[0035] 3-Lifting drive mechanism; 31-Electric cylinder;

[0036] 4-Thickness measuring assembly; 41-Fixed base; 411-Sliding hole; 42-Rigid piston; 43-Sliding rod; 44-Rod-shaped measuring scale; 45-Second helical spring; 46-Modible ring plate;

[0037] 5-Guide assembly; 51-Guide cylinder; 52-Guide post;

[0038] 6-Elastic component; 61-First helical spring;

[0039] 7-Bearing; 8-Columnar concrete core sample; 9-Road surface. Detailed Implementation

[0040] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0041] It should be noted that when an element is referred to as "connected to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to or indirectly connected to the other element. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "attached" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0043] Please refer to the following: Figures 1 to 9 The road concrete thickness detection device provided in this embodiment of the present invention will now be described. Please refer to the following for further details. Figure 1 , Figure 2 and Figure 3 The road concrete thickness detection device provided in this embodiment includes a positioning frame 1, a concrete core sampling mechanism 2, a lifting drive mechanism 3, and a thickness measuring component 4. The concrete core sampling mechanism 2 is movably mounted on the positioning frame 1. The lifting drive mechanism 3 is mounted on the positioning frame 1, and its power output end is connected to the concrete core sampling mechanism 2, enabling it to drive the core sampling mechanism 2 to move up and down. The thickness measuring component 4 is mounted on the concrete core sampling mechanism 2 and is used to measure the thickness of the concrete core sample taken out by the core sampling mechanism 2. Further details can be found in the reference [reference needed]. Figure 4 and Figure 5The concrete core sampling mechanism 2 includes a lifting platform 21, a core sampling cylinder 22, a core cutter head 23, and a drive motor 24 for driving the core sampling cylinder 22 to rotate. The core sampling cylinder 22 and the core cutter head 23 are detachably connected by bolts or other connecting parts. The lifting platform 21 is installed inside the positioning frame 1 and can move up and down. The core sampling cylinder 22 is rotatably installed on the lifting platform 21 through a bearing 7. The core sampling cylinder 22 is installed in a vertical position. The core cutter head 23 is fixedly installed at the bottom opening of the core sampling cylinder 22. The drive motor 24 is fixedly installed on the lifting platform 21, and the motor shaft of the drive motor 24 is connected to the core sampling cylinder 22 for transmission. The thickness measuring assembly 4 includes a fixed base 41, a rigid piston 42, a sliding rod 43, and a graduated rod-shaped measuring ruler 44. The fixed base 41 is located at the top opening of the core sampling cylinder 22. The rigid piston 42 is slidably disposed in the core sampling cylinder 22. The sliding rod 43 is inserted into the core sampling cylinder 22. The fixed base 41 is provided with a sliding hole 411 for slidingly installing the sliding rod 43. The first end of the sliding rod 43 is located inside the core sampling cylinder 22 and is connected to the rigid piston 42. The second end of the sliding rod 43 passes through the sliding hole 411 and extends out of the core sampling cylinder 22. The outer peripheral surface of the sliding rod 43 slides in contact with the inner wall of the sliding hole 411. The bottom end of the rod-shaped measuring ruler 44 is connected to the sliding rod 43. The bottom surface of the rigid piston 42 is flush with the bottom end surface of the core sampling cylinder 22. It should be noted that the positioning stand 1 is equipped with an indicator structure that can indicate the scale on the rod-shaped measuring ruler 44, so that the user can accurately read the corresponding scale value on the rod-shaped measuring ruler 44. The indicator structure can be a pointer, a marking groove, or a marking protrusion, etc.

[0044] The working principle of the road concrete thickness detection device provided in this embodiment of the utility model is as follows: the concrete core sampling mechanism 2 is positioned in the selected section of the completed concrete road by the positioning platform 1, the drive motor 24 drives the core sampling cylinder 22 to rotate, and the core sampling cylinder 22 drives the cylinder cutter head 23 to rotate and cut the concrete. At the same time, the lifting drive mechanism 3 drives the entire concrete core sampling mechanism 2 to move downward, so that the concrete core sample cut into a column shape by the cylinder cutter head 23 is gradually collected in the core sampling cylinder 22. After the core sampling mechanism 2 obtains a complete columnar concrete core sample 8, the lifting drive mechanism 3 drives the entire core sampling mechanism 2 upward until the cutter head 23 on the core sampling cylinder 22 moves above the concrete road surface. The cutter head 23 is then removed from the core sampling cylinder 22. The entire road concrete thickness detection device is moved to a flat concrete road surface. Next, the lifting drive mechanism 3 drives the entire core sampling mechanism 2 downward until the bottom surface of the core sampling cylinder 22 is flush with the concrete road surface. At this point, the bottom of the columnar concrete core sample 8 inside the core sampling cylinder 22 rests against the concrete road surface 9. Figure 8As shown. During the core sampling process, the columnar concrete core sample 8 inside the core sampling cylinder 22 continuously pushes the rigid piston 42 upward. The rigid piston 42 drives the sliding rod 43 to slide upward along the axial direction. The sliding rod 43 then drives the rod-shaped measuring ruler 44 to move upward along the axial direction of the sliding rod 43. At this time, by reading the scale value of the rod-shaped measuring ruler 44 before core sampling and the scale value of the rod-shaped measuring ruler 44 after core sampling, the distance that the columnar concrete core sample 8 pushes the rigid piston 42 can be calculated. This distance is equal to the thickness of the columnar concrete core sample 8 inside the core sampling cylinder 22. In this way, the thickness of the columnar concrete core sample 8 inside the core sampling cylinder 22 can be measured without knocking it out. This effectively avoids the problem that knocking out the columnar concrete core sample 8 can easily cause it to break, thus affecting the accuracy of the concrete thickness measurement. In addition, after the thickness measurement of the columnar concrete core sample 8 is completed, the rigid piston 42 can be pushed out of the core sampling tube 22 by pressing down the rod-shaped measuring ruler 44 until the columnar concrete core sample 8 is separated from the core sampling tube 22. This helps to ensure the integrity of the columnar concrete core sample 8 and facilitates the re-measurement of the columnar concrete core sample 8 in the later stage.

[0045] Compared with the prior art, the road concrete thickness detection device provided in this embodiment of the utility model, after the concrete core sampling mechanism 2 obtains a complete columnar concrete core sample 8, is driven by the lifting drive mechanism 3 to move the entire concrete core sampling mechanism 2 above the concrete road surface, and the cutter head 23 is removed from the core sampling cylinder 22. Then, the entire road concrete thickness detection device is moved to a flat concrete road, and then the lifting drive mechanism 3 drives the entire concrete core sampling mechanism 2 downward until the bottom end face of the core sampling cylinder 22 is flush with the concrete road surface. At this time, the bottom of the columnar concrete core sample 8 in the core sampling cylinder 22 abuts against the concrete road surface. During this process, the moving distance of the columnar concrete core sample 8 pushing the rigid piston 42 in the core sampling cylinder 22 can be measured by the rod-shaped measuring ruler 44. The moving distance of the rigid piston 42 is equal to the thickness of the columnar concrete core sample 8 in the core sampling cylinder 22. In this way, the thickness of the columnar concrete core sample 8 can be directly measured without having to knock it out of the core sampling tube 22. This effectively avoids the problem that knocking out the columnar concrete core sample 8 can easily cause it to break and affect the accuracy of the concrete thickness measurement.

[0046] Please refer to the following: Figure 1 , Figure 2 and Figure 9In some embodiments, the road concrete thickness detection device further includes a guide assembly 5 for guiding the lifting platform 21 to move up and down. The guide assembly includes multiple guide cylinders 51 connected to the lifting platform 21 and multiple guide columns 52 connected to the positioning frame 1. The guide columns 52 are arranged one-to-one with the guide cylinders 51, and the axial direction of each guide column 52 is parallel to the axial direction of the core sampling cylinder 22. Each guide cylinder 51 is slidably fitted onto the corresponding guide column 52. In this embodiment, during the process of the lifting drive mechanism 3 driving the lifting platform 21 to move up and down, the guide assembly 5, formed by the cooperation of multiple guide columns 52 and multiple guide sleeves, guides the lifting platform 21 to move up and down, which helps to improve the stability of the lifting platform 21.

[0047] Please refer to the following: Figure 1 and Figure 2 In some embodiments, multiple guide columns 52 are distributed at intervals along the circumference of the lifting platform 21 to further improve the stability of the lifting platform 21 during lifting.

[0048] Please refer to the following: Figure 1 , Figure 2 and Figure 3 In some embodiments, the positioning platform 1 includes a first positioning platform 11 for supporting and positioning on the concrete road surface, a plurality of vertical support columns 12 vertically and spaced apart on the first positioning platform 11, and a second positioning platform 13 parallel to and spaced apart from the first positioning platform 11. The plurality of vertical support columns 12 are respectively fixedly connected to the second positioning platform 13. The entire concrete core sampling mechanism 2 is located between the first positioning platform 11 and the second positioning platform 13. The first positioning platform 11 is provided with a first through hole 14 for the core sampling cylinder 22 and / or the core cutting head 23 to pass through. The diameter of the first through hole 14 is slightly larger than the diameter of the core sampling cylinder 22, so that the first through hole 14 can guide the core sampling cylinder 22 to move up and down, so as to avoid the core sampling cylinder 22 tilting during the core sampling process and affecting the core sampling. The second positioning platform 13 is provided with a second through hole 15 for the sliding rod 43 and / or the rod-shaped measuring ruler 44 to pass through.

[0049] Please refer to the following: Figure 2 , Figure 7 and Figure 9In some embodiments, the road concrete thickness detection device further includes an elastic component 6 for elastically lifting the lifting platform 21 toward the second positioning platform 13. The first end of the elastic component 6 abuts against the first positioning platform 11, and the second end abuts against the lifting platform 21 and / or the guide cylinder 51. In this embodiment, the elastic component 6 elastically lifts the lifting platform 21 toward the second positioning platform 13, providing a buffering effect during the downward movement of the lifting platform 21 driven by the lifting drive mechanism 3. Furthermore, when the lifting drive mechanism 3 stops working, the elastic force of the elastic component 6 can reset the lifting platform 21, thereby allowing the entire concrete core sampling mechanism 2 to automatically move above the concrete road surface.

[0050] Please refer to the following: Figure 1 , Figure 2 and Figure 9 In some embodiments, the elastic component 6 includes a plurality of first helical springs 61, which are arranged one-to-one with the guide post 52. Each first helical spring 61 is sleeved on the corresponding guide post 52. The first end of each first helical spring 61 abuts against the first positioning platform 11, and the second end of each first helical spring 61 abuts against the bottom end of the lifting platform 21 and / or the corresponding guide cylinder 51.

[0051] Please refer to the following: Figure 1 , Figure 2 and Figure 9 In some embodiments, the lifting drive mechanism 3 includes multiple electric cylinders 31, the cylinder body of each electric cylinder 31 being fixedly connected to the positioning platform 1, and the telescopic rod of each electric cylinder 31 being connected to the lifting platform 21. It should be noted that the multiple electric cylinders 31 are evenly distributed along the circumference of the lifting platform 21, which helps to improve the balance of force on the lifting platform 21. Furthermore, the electric cylinders 31 can also be replaced by linear drive mechanisms such as electric push rods.

[0052] Please refer to the following: Figure 1 , Figure 4 and Figure 9 In some embodiments, the concrete core sampling mechanism 2 further includes a gear transmission mechanism 25 that drives the motor shaft of the drive motor 24 to the core sampling cylinder 22. The gear transmission mechanism 25 includes a driven gear 251 fixedly mounted on the core sampling cylinder 22 and / or the fixed base 41, and a driving gear 252 fixedly mounted on the motor shaft of the drive motor 24. The driving gear 252 meshes with the driven gear 251. In this embodiment, the gear transmission mechanism 25 drives the motor shaft of the drive motor 24 to the core sampling cylinder 22, which helps to reduce the overall size of the concrete core sampling mechanism 2 and improves the transmission efficiency.

[0053] Please refer to the following: Figure 1 , Figure 2 and Figure 4 In some embodiments, the number of driving gears 252 is set to multiple, and the number of drive motors 24 is the same as the number of driving gears 252. Each driving gear 252 corresponds to one drive motor 24, and each driving gear 252 is fixedly mounted on the motor shaft of the corresponding drive motor 24. The multiple driving gears 252 mesh with driven gears 251 respectively, and the multiple driving gears 252 are evenly spaced along the circumference of the driven gears 251. In this embodiment, by synchronously driving the driven gears 251 with multiple drive motors 24, the power of a single drive motor 24 can be reduced accordingly.

[0054] Please refer to the following: Figure 5 , Figure 6 and Figure 7 In some embodiments, the thickness measuring assembly 4 further includes a second helical spring 45 for elastically abutting the rigid piston 42 toward the bottom opening of the core tube 22, and a movable ring plate 46 slidably fitted on the sliding rod 43 and located in the core tube 22. The first end of the second helical spring 45 abuts against the rigid piston 42, and the second end of the second helical spring 45 abuts against the movable ring plate 46, which abuts against the fixed seat 41. In this embodiment, on the one hand, the rigid piston 42 can be pressed against the top of the columnar concrete core sample 8 by the second helical spring 45 to prevent gaps from forming between the rigid piston 42 and the columnar concrete core sample 8, which would affect the accuracy of the concrete thickness measurement; on the other hand, the rigid piston 42 can push the rigid piston 42 by the second helical spring 45. After the thickness measurement of the columnar concrete core sample 8 is completed, the rigid piston 42 can automatically push the columnar concrete core sample 8 out of the core sampling tube 22 until the columnar concrete core sample 8 is separated from the core sampling tube 22. This helps to ensure the integrity of the columnar concrete core sample 8 and facilitates the re-measurement of the columnar concrete core sample 8 in the later stage.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A road concrete thickness detection device, characterized in that, include: Positioning platform; The concrete core sampling mechanism is mounted on the positioning platform and can move up and down. A lifting drive mechanism is mounted on the positioning platform. The power output end of the lifting drive mechanism is connected to the concrete core sampling mechanism so that the lifting drive mechanism can drive the concrete core sampling mechanism to move up and down. as well as A thickness measuring component is used to measure the thickness of the concrete core sample taken out by the concrete core sampling mechanism; The concrete core sampling mechanism includes a lifting platform that can move up and down inside the positioning frame, a core sampling cylinder that is rotatably mounted on the lifting platform and vertically positioned, a cutter head fixedly mounted at the bottom opening of the core sampling cylinder, and a drive motor that drives the core sampling cylinder to rotate. The drive motor is fixedly mounted on the lifting platform. The thickness measuring component includes a fixed seat at the top opening of the core sampling cylinder, a rigid piston slidably mounted in the core sampling cylinder, a sliding rod inserted in the core sampling cylinder, and a graduated rod-shaped measuring ruler. The fixed seat has a sliding hole for slidingly mounting the sliding rod. The first end of the sliding rod is located inside the core sampling cylinder and connected to the rigid piston. The second end of the sliding rod passes through the sliding hole and extends outside the core sampling cylinder. The outer circumferential surface of the sliding rod slides in contact with the inner wall of the sliding hole. The bottom end of the rod-shaped measuring ruler is connected to the sliding rod. The bottom surface of the rigid piston is flush with the bottom end surface of the core sampling cylinder.

2. The road concrete thickness detection device as described in claim 1, characterized in that, The road concrete thickness detection device also includes a guide assembly for guiding the lifting platform to move up and down. The guide assembly includes multiple guide cylinders connected to the lifting platform and multiple guide columns connected to the positioning frame. The guide columns and guide cylinders are arranged in a one-to-one correspondence. The axial direction of each guide column is parallel to the axial direction of the core sampling cylinder, and each guide cylinder is slidably fitted onto the corresponding guide column.

3. The road concrete thickness detection device as described in claim 2, characterized in that, The guide columns are distributed at intervals along the circumference of the lifting platform.

4. The road concrete thickness detection device as described in claim 2, characterized in that, The positioning frame includes a first positioning platform for supporting and positioning on the concrete road surface, a plurality of vertical support columns arranged vertically and at intervals on the first positioning platform, and a second positioning platform arranged parallel to and at intervals with the first positioning platform. The plurality of vertical support columns are respectively fixedly connected to the second positioning platform. The first positioning platform is provided with a first through hole for the core-taking cylinder and / or the cylinder cutter head to pass through.

5. The road concrete thickness detection device as described in claim 4, characterized in that, The road concrete thickness detection device further includes an elastic component for elastically lifting the lifting platform toward the second positioning platform. The first end of the elastic component abuts against the first positioning platform, and the second end of the elastic component abuts against the lifting platform and / or the guide cylinder.

6. The road concrete thickness detection device as described in claim 5, characterized in that, The elastic component includes a plurality of first helical springs, each of which is correspondingly arranged with a guide post. Each first helical spring is sleeved on the corresponding guide post. The first end of each first helical spring abuts against the first positioning platform, and the second end of each first helical spring abuts against the bottom end of the lifting platform and / or the corresponding guide cylinder.

7. The road concrete thickness detection device as described in claim 1, characterized in that, The lifting drive mechanism includes multiple electric cylinders, the cylinder body of each electric cylinder is fixedly connected to the positioning platform, and the telescopic rod of each electric cylinder is connected to the lifting platform.

8. The road concrete thickness detection device as described in claim 1, characterized in that, The concrete core sampling mechanism further includes a gear transmission mechanism that drives the motor shaft of the drive motor to the core sampling cylinder. The gear transmission mechanism includes a driven gear fixedly mounted on the core sampling cylinder and / or the fixed base and a driving gear fixedly mounted on the motor shaft of the drive motor. The driving gear meshes with the driven gear.

9. The road concrete thickness detection device as described in claim 8, characterized in that, The number of driving gears is set to multiple, and the number of drive motors is the same as the number of driving gears. The driving gears and drive motors are arranged in a one-to-one correspondence. Each driving gear is fixedly mounted on the motor shaft of the corresponding drive motor, and the multiple driving gears mesh with the driven gears respectively.

10. The road concrete thickness detection device as described in any one of claims 1 to 9, characterized in that, The thickness measuring assembly further includes a second helical spring for elastically abutting the rigid piston toward the bottom opening of the core tube, and a movable ring plate slidably fitted on the sliding rod and located in the core tube. The first end of the second helical spring abuts against the rigid piston, and the second end of the second helical spring abuts against the movable ring plate, which abuts against the fixed seat.

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