An extendable concrete, rock core sample surface morphology continuous transmission scanning imaging device and method

Abstract

The application discloses an extendable concrete and rock core sample surface morphology continuous transmission scanning imaging device and method, and belongs to the technical field of rock mass surface morphology optical scanning. The device comprises a base, a hydraulic rod, an arc-shaped support frame, a scanning mechanism and a positioning mechanism. The scanning mechanism moves upward along with the arc-shaped support frame through an adjusting ring, is pushed by a second connecting rod to drive a sliding rod to move the camera unit radially, so that the distance between the camera and the core sample surface is always kept within the focusing range, and the problem that the existing technology cannot adapt to the diameter change of the core sample only by automatic focusing to cause imaging fluctuation is solved. The positioning mechanism can realize self-adaptive adjustment of illumination intensity by linkage of a light shield, a laser range finder can match the scanning speed by linkage of a gearbox, and an extension frame can realize linear butt joint of multiple devices to adapt to continuous scanning of an ultra-long core sample. The application has high imaging definition and high scanning efficiency, and is suitable for core sample digital detection in the fields of water and electricity, traffic and the like.

Description

Technical Field

[0001] This invention relates to the field of core sample surface morphology detection technology, and in particular to a scalable continuous transmission scanning imaging device and method for concrete and rock core sample surface morphology. Background Technology

[0002] In hydropower, transportation, and construction engineering, the quality of concrete structures and rock foundations directly affects the safe operation of the project. Core sampling is one of the most direct and reliable methods for detecting the internal quality of a structure. By scanning and imaging the surface morphology of the core sample, key information such as cracks, voids, delamination, and aggregate distribution can be obtained, providing a basis for project quality assessment. With the development of information technologies such as U3D and digital twin technology, establishing a high-precision digital core sample library has become an indispensable and important component of dam digital twins, placing higher demands on the efficiency, accuracy, and adaptability of core sample scanning imaging. Among these, X-ray transmission scanning and optical appearance morphology scanning of concrete core samples are the main means of establishing a digital core sample library.

[0003] For concrete with a generally uniform distribution of phases but localized non-uniform distribution, larger diameter and longer core samples are more representative of the concrete's composition, phases, and micro- to sub-micro- to macro-structural characteristics. However, the difficulty of drilling, transporting, preserving, and digitally scanning ultra-long core samples increases exponentially, and traditional local scanning and digital stitching methods still have certain drawbacks. When the core sample length exceeds the width of conventional scanning equipment, scanning interruptions are very likely to occur. Furthermore, because the grayscale contrast on the concrete surface is very weak, the positioning effect of the machine vision system is poor, the image stitching speed is slow, and errors are easily accumulated, seriously affecting the subsequent analysis results. Moreover, existing technologies rely solely on the automatic focusing of the camera during scanning imaging, and the camera position is fixed. When the diameter of the core sample changes, the distance between the camera and the core sample changes, and the contradiction between rapid scanning and refocusing is irreconcilable, affecting either image quality or work efficiency.

[0004] In addition, existing technologies have the drawback of fixed illumination intensity: large-diameter core samples are prone to insufficient edge illumination and local shadows, while small-diameter core samples are prone to overexposure, both of which reduce image quality; at the same time, the fixed transport speed makes it impossible to match the sampling density according to the core sample diameter, large-diameter core samples are prone to missed scanning and blurring, and small-diameter core samples have low scanning efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a scalable continuous transmission scanning imaging device and method for concrete and rock core sample surface morphology. It can adaptively adjust the camera position, illumination intensity and transmission speed according to the core sample diameter to ensure imaging quality and scanning efficiency. At the same time, it can be adapted to continuous scanning of ultra-long core samples by docking multiple units.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an expandable continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples, comprising a base, a hydraulic rod installed on the outer wall of the middle part of the base, an arc-shaped support frame fixed to the output end of the hydraulic rod, and a scanning mechanism and a positioning mechanism provided on the arc-shaped support frame; The scanning mechanism includes several equidistant, circumferentially distributed sliding rods that are slidably inserted into the outer wall of an arc-shaped support frame. Each sliding rod has a camera unit installed on the outer wall of one end extending to the inner side of the arc-shaped support frame. Each sliding rod has a second connecting rod rotatably connected to the outer wall of one end located on the outer side of the arc-shaped support frame. An adjusting ring is slidably sleeved on the outer wall of the arc-shaped support frame. The end of each second connecting rod away from the sliding rod is rotatably connected to the outer wall of the adjusting ring. A laser rangefinder for measuring the upward movement distance of the arc-shaped support frame is installed on the bottom outer wall of the arc-shaped support frame. The laser rangefinder is electrically connected to the gearbox via a controller. An inclined block that can abut against the adjusting ring is provided on the outer wall of the base.

[0007] Preferably, the positioning mechanism includes several swing rods rotatably connected to the inner wall of the arc-shaped support frame. Several lighting units are arranged equidistantly in a circular pattern on the inner wall of the arc-shaped support frame. A light shield sleeved on the outside of the lighting unit is rotatably connected to the inner wall of the arc-shaped support frame. A roller for abutting the core sample is rotatably connected to the outer wall of the end of each swing rod near the axis of the arc-shaped support frame.

[0008] Preferably, a plurality of the swing arms are equidistantly distributed in a circle around the axis of the arc-shaped support frame, and a second electric push rod is rotatably connected to the outer wall of one of the swing arms, the output end of the second electric push rod being rotatably connected to the inner wall of the arc-shaped support frame.

[0009] Preferably, a first connecting rod is rotatably connected to the outer wall of each of the swing rods, and the end of each first connecting rod away from the swing rod is rotatably connected to the outer wall of the light shield. The outer wall of the light shield has a plurality of equidistant circumferentially distributed openings.

[0010] Preferably, each of the slide rods has a boss on the outer wall of one end located outside the arc-shaped support frame, and a return spring is provided between the outer wall of each boss and the outer wall of the arc-shaped support frame, with the return spring sleeved on the outer wall of the slide rod.

[0011] Preferably, a pair of conveyor belts symmetrically distributed on both sides of the arc-shaped support frame are provided on the outer wall of the base, a gearbox is installed on the outer wall of the base, the output end of the gearbox is connected to the shaft of the conveyor belt, and a motor is provided at the input end of the gearbox.

[0012] Preferably, a first electric push rod is installed on the outer wall of both ends of the base, and an extension frame is installed on the outer wall of the output end of each first electric push rod. A roller is rotatably connected to the top outer wall of the two extension frames, and the roller and the conveyor belt are located in the same plane.

[0013] Preferably, one of the extension frames has a docking hole on its outer wall, and the other extension frame has a docking post on its outer wall.

[0014] Another aspect of the present invention provides a scalable continuous transmission scanning imaging method for the surface morphology of concrete and rock core samples, comprising the following steps: S1: Based on the length of the core sample to be scanned, at least one scanning imaging device is linearly connected through the docking holes and docking posts of the extension frame; S2: Place the core sample to be scanned on the conveyor belt, making the axis of the core sample parallel to the conveying direction of the conveyor belt; S3: Based on the diameter of the core sample, the arc-shaped support frame is moved upward by a distance equal to the radius of the core sample via a hydraulic rod; S4: During the upward movement of the arc-shaped support frame, the adjusting ring slides laterally along the inclined surface of the inclined block, and pushes the slide rod through the second connecting rod to drive the camera unit to move radially outward, so that the distance between the camera unit and the core sample surface is kept within the focusing range; S5: The laser rangefinder detects the upward movement distance of the arc support frame in real time. The controller controls the gearbox to adjust the conveyor belt speed according to the distance. The larger the core sample diameter, the slower the conveyor speed. S6: Start the second electric push rod to drive the swing arm to swing, so that the roller abuts against the core sample and completes coaxial positioning. At the same time, the swing arm drives the light shield to rotate through the first connecting rod to adjust the lighting intensity of the lighting unit. S7: Start the conveyor belt and all camera units to continuously scan and image the core sample surface.

[0015] Preferably, in step S3, when the core sample is a variable diameter core sample, the change in the core sample diameter is detected in real time by a pressure sensor installed on the roller, and the controller adjusts the extension and retraction of the hydraulic rod in real time according to the pressure signal so that the axis of the arc support frame always coincides with the axis of the core sample. In step S5, the controller has a pre-stored table of the correspondence between the core sample diameter and the conveying speed. When the laser rangefinder detects that the upward movement distance of the arc support frame is h, the controller queries the corresponding table and adjusts the conveying speed of the conveyor belt to v=k / h, where k is a preset constant. In step S7, multiple docked scanning imaging devices achieve conveyor belt speed synchronization and camera unit acquisition synchronization through a synchronization controller, and the scanned images of two adjacent devices are stitched together through preset marker points.

[0016] The present invention has the following beneficial effects: 1. The present invention, through its scanning mechanism, enables the adjusting ring to slide away from the axis of the arc-shaped support frame via a second connecting rod during the upward movement of the adjusting ring. This causes the sliding rod to move the camera unit away from the axis of the arc-shaped support frame. The larger the diameter of the core sample, the farther the camera unit moves away from the axis of the arc-shaped support frame. This ensures that the distance between the core sample and the camera unit remains within the focusing range, thereby guaranteeing the clarity of the scanned image. This avoids the situation in the prior art where the device relies solely on automatic focusing, which cannot adapt to changes in the core sample diameter, resulting in poor imaging effects.

[0017] 2. The present invention increases the width of the device by pushing the extension frame away from the base with the first electric push rod, thereby avoiding the situation where the core sample cannot be smoothly placed on the conveyor belt when it is too long, which greatly improves the applicability of the device. Furthermore, when the length of the core sample exceeds the adjustment range of the extension frame, several devices can be linearly arranged and connected together through the docking holes and docking posts provided on the extension frame, thus making the device suitable for scanning and imaging of ultra-long core samples.

[0018] 3. The present invention, through its positioning mechanism, ensures that during the swing of the aforementioned pendulum, under the action of the first connecting rod, the pendulum pushes the light shield to rotate at a certain angle. Since the opening on the light shield is initially facing the illumination unit, after the light shield rotates, the opening is misaligned with the illumination unit, thus partially blocking the light from the illumination unit. This achieves the effect of changing the illumination intensity. When the core sample diameter is larger, the pendulum drives the roller to contact the core sample earlier, resulting in a smaller rotation angle of the light shield and a smaller degree of occlusion of the illumination unit. At this time, the illumination intensity is greater. Similarly, when the core sample diameter is smaller, the light shield occupies the illumination unit more, resulting in a smaller illumination intensity. This achieves the effect of adaptively adjusting the illumination intensity according to the core sample diameter, avoiding local imaging shadows due to insufficient light coverage when scanning large-diameter core samples, and avoiding image overexposure due to excessive illumination intensity when scanning small-diameter core samples. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a three-dimensional schematic diagram of the overall structure proposed in this invention. Figure 1 ; Figure 2 A three-dimensional schematic diagram of the arc-shaped support frame proposed in this invention. Figure 1 ; Figure 3 A three-dimensional schematic diagram of the arc-shaped support frame proposed in this invention. Figure 2 ; Figure 4This is a three-dimensional cross-sectional view of the light shield proposed in this invention; Figure 5 This is a three-dimensional schematic diagram of the pendulum rod proposed in this invention; Figure 6 This is a three-dimensional schematic diagram of the adjustment ring proposed in this invention; Figure 7 This is a three-dimensional schematic diagram of the overall structure proposed in this invention. Figure 2 .

[0021] In the diagram: 1. Base; 11. Extension frame; 111. First electric push rod; 112. Docking hole; 113. Docking column; 114. Roller; 12. Conveyor belt; 13. Motor; 14. Gearbox; 15. Hydraulic rod; 16. Inclined block; 2. Arc-shaped support frame; 21. Camera unit; 211. Slide rod; 212. Boss; 213. Return spring; 22. Illumination unit; 23. Laser rangefinder; 3. Swing arm; 31. Roller; 32. First connecting rod; 33. Second electric push rod; 4. Sunshade; 41. Opening; 5. Adjusting ring; 51. Second connecting rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] Example 1: Reference Figures 1 to 7 As shown, an expandable continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples includes a base 1. A hydraulic rod 15 is installed on the outer wall of the middle part of the base 1. An arc-shaped support frame 2 is fixed on the outer wall of the output end of the hydraulic rod 15. A scanning mechanism and a positioning mechanism are provided on the arc-shaped support frame 2. A pair of conveyor belts 12 symmetrically distributed on both sides of the arc-shaped support frame 2 are provided on the outer wall of the base 1. A gearbox 14 is installed on the outer wall of the base 1. The output end of the gearbox 14 is connected to the rotating shaft of the conveyor belt 12. A motor 13 is provided at the input end of the gearbox 14. First electric push rods 111 are installed on the outer walls of both ends of the base 1. An extension frame 11 is installed on the outer wall of the output end of each first electric push rod 111. A roller 114 is rotatably connected to the top outer wall of both extension frames 11. The roller 114 and the conveyor belt 12 are located in the same plane. A docking hole 112 is opened on the outer wall of one extension frame 11, and a docking post 113 is provided on the outer wall of the other extension frame 11.

[0024] Furthermore, the scanning mechanism includes several equidistantly distributed circumferentially sliding rods 211 slidably inserted into the outer wall of the arc-shaped support frame 2. A camera unit 21 is mounted on the outer wall of one end of each sliding rod 211 extending to the inner side of the arc-shaped support frame 2. A second connecting rod 51 is rotatably connected to the outer wall of one end of each sliding rod 211 located on the outer side of the arc-shaped support frame 2. An adjusting ring 5 is slidably sleeved on the outer wall of the arc-shaped support frame 2. The end of each second connecting rod 51 away from the sliding rod 211 is rotatably connected to the outer wall of the adjusting ring 5. A laser rangefinder 23 for measuring the upward movement distance of the arc-shaped support frame 2 is installed on the bottom outer wall of the support frame 2. The laser rangefinder 23 is electrically connected to the gearbox 14 through a controller. An inclined block 16 that can abut against the adjusting ring 5 is provided on the outer wall of the base 1. A boss 212 is provided on the outer wall of one end of each slide rod 211 located outside the arc-shaped support frame 2. A return spring 213 is provided between the outer wall of each boss 212 and the outer wall of the arc-shaped support frame 2. The return spring 213 is sleeved on the outer wall of the slide rod 211.

[0025] It should be noted that the gearbox 14 adopts an electromechanical automatic transmission. Based on the traditional dry clutch and manual gear transmission, an electronic control system is added to transform the manual shifting mechanism into an automatic shifting mechanism, thereby realizing a stepped mechanical automatic transmission with automatic shifting. This type of transmission is a relatively mature existing technology and will not be described in detail here. The camera unit 21 is used to take pictures of the core sample surface from all directions to obtain image information of the core sample surface.

[0026] Initially, the hydraulic rod 15 is in a retracted state. At this time, the axis of the arc-shaped support frame 2 and the conveyor belt 12 are in the same plane. Therefore, during operation, by pushing the arc-shaped support frame 2 upward by the hydraulic rod 15, a distance equal to the radius of the core sample is moved, so that the center of the core sample on the conveyor belt 12 is in the same plane as the axis of the arc-shaped support frame 2. Subsequently, under the action of the positioning mechanism, the center of the core sample coincides with the axis of the arc-shaped support frame 2, so that each illumination unit 22 and each camera unit 21 can be distributed equidistantly around the core sample, ensuring the scanning imaging effect. Furthermore, under the support of the hydraulic rod 15, the core sample will not bear the weight of the components on the arc-shaped support frame 2, thereby preventing the core sample from breaking.

[0027] Meanwhile, as the hydraulic rod 15 pushes the arc-shaped support frame 2 upward, the laser rangefinder 23 can measure the upward distance of the arc-shaped support frame 2. The controller converts the measured value into an electrical signal, and then controls the output end of the gearbox 14 to decelerate through the controller signal, thereby reducing the feed speed of the core sample on the conveyor belt 12. This achieves the effect of reducing the scanning speed when the core sample diameter increases, further ensuring the scanning imaging effect. Since the circumferential surface area of ​​the large-diameter core sample is larger, the surface texture, cracks, markers and other features are distributed over a wider range. If the forward speed is too fast, the acquisition frequency of the scanning equipment will not be able to match, resulting in a decrease in the sampling point density per unit length, and surface features will be missed or blurred.

[0028] Furthermore, during the process of the hydraulic rod 15 pushing the arc-shaped support frame 2 upward, the arc-shaped support frame 2 drives the adjusting ring 5 to move upward synchronously. Since, in the initial state, under the action of the return spring 213, the slide rod 211 pushes the camera unit 21 closer to the axis of the arc-shaped support frame 2, and simultaneously, the slide rod 211, through the second connecting rod 51, pushes the adjusting ring 5 to maintain contact with the inclined block 16, thus, during the upward movement of the adjusting ring 5, the adjusting ring 5 can slide laterally along the inclined surface of the inclined block 16. Therefore, the adjusting ring 5, through the second connecting rod 51, pushes the slide rod 211 away from the inclined surface. The sliding of one side of the axis of the arc-shaped support frame 2 causes the slide rod 211 to move the camera unit 21 away from the axis of the arc-shaped support frame 2. This allows the position of the camera unit 21 to be adjusted according to the diameter of the core sample. The larger the diameter of the core sample, the farther the camera unit 21 moves away from the axis of the arc-shaped support frame 2. This ensures that the distance between the core sample and the camera unit 21 is always kept within the focusing range, thereby ensuring the clarity of the scanned image. This avoids the situation in the existing technology where the automatic focusing of the equipment cannot adapt to changes in the diameter of the core sample, resulting in poor imaging effect.

[0029] Furthermore, by pushing the extension frame 11 away from the base 1 with the first electric push rod 111, the width of the device can be increased, thereby avoiding the situation where the core sample cannot be smoothly placed on the conveyor belt 12 when it is too long. This greatly improves the applicability of the device. Moreover, when the length of the core sample exceeds the adjustment range of the extension frame 11, several devices can be linearly arranged and connected together through the docking holes 112 and docking posts 113 provided on the extension frame 11, thus enabling the device to be used for scanning and imaging of ultra-long core samples.

[0030] The positioning mechanism includes several swing rods 3 rotatably connected to the inner wall of the arc-shaped support frame 2. Several lighting units 22 are equidistantly distributed in a circle on the inner wall of the arc-shaped support frame 2. A light shield 4 is rotatably connected to the inner wall of the arc-shaped support frame 2 and sleeved on the outside of the lighting units 22. A roller 31 for abutting the core sample is rotatably connected to the outer wall of the end of each swing rod 3 near the axis of the arc-shaped support frame 2. Several swing rods 3 are equidistantly distributed in a circle around the axis of the arc-shaped support frame 2. A second electric push rod 33 is rotatably connected to the outer wall of one of the swing rods 3. The output end of the second electric push rod 33 is rotatably connected to the inner wall of the arc-shaped support frame 2. A first connecting rod 32 is rotatably connected to the outer wall of each swing rod 3. The end of each first connecting rod 32 away from the swing rod 3 is rotatably connected to the outer wall of the light shield 4. Several equidistantly distributed openings 41 are opened on the outer wall of the light shield 4.

[0031] It should be noted that in the initial state, the second electric push rod 33 is in the retracted state, and the swing rod 3 rotates to the side away from the axis of the arc-shaped support frame 2.

[0032] When the conveyor belt 12 transports the core sample into the arc-shaped support frame 2, the second electric push rod 33 is activated to extend, causing the swing rod 3 to drive the roller 31 to contact the core sample. Under the linkage of the first connecting rod 32 and the light shield 4, all the swing rods 3 move synchronously, so that the equidistantly distributed circumferential swing rods 3 can push the core sample and the arc-shaped support frame 2 to complete coaxial positioning, avoiding deviation during the core sample's forward movement, ensuring the scanning imaging effect. Furthermore, the core sample is supported by the two sections of the conveyor belt 12 and the roller 31 on the swing rod 3, which can prevent the core sample from bending and breaking at the suspended part due to its excessively large length-to-slenderness ratio.

[0033] Simultaneously, during the swing of the aforementioned pendulum 3, under the action of the first connecting rod 32, the pendulum 3 pushes the light shield 4 to rotate at a certain angle. Since the opening 41 on the light shield 4 is directly facing the illumination unit 22 in the initial state, after the light shield 4 rotates, the opening 41 is misaligned with the illumination unit 22, thereby partially blocking the light from the illumination unit 22, thus achieving the effect of changing the illumination intensity. When the core sample diameter is larger, the pendulum 3 drives the roller 31 to contact the core sample earlier, thereby making the rotation angle of the light shield 4 smaller, and thus making the degree of occlusion of the illumination unit 22 by the light shield 4 smaller, and the illumination intensity greater at this time. Similarly, when the core sample diameter is smaller, the degree of occlusion of the illumination unit 22 by the light shield 4 is greater, and the illumination intensity is smaller at this time. This achieves the effect of adaptively adjusting the illumination intensity according to the core sample diameter, avoiding the situation of local imaging shadows due to insufficient light coverage when scanning large-diameter core samples, and avoiding the situation of image exposure due to excessive illumination intensity when scanning small-diameter core samples.

[0034] Working principle of this invention: According to the length of the core sample, several of these devices are connected together in a linear arrangement through the docking holes 112 and docking posts 113 provided on the extension frame 11, and the core sample is placed on the conveyor belt 12. The arc-shaped support frame 2 is pushed upward by the hydraulic rod 15, moving it an upward distance equal to the radius of the core sample. Under the action of the scanning mechanism, the laser rangefinder 23 can measure the upward movement distance of the arc-shaped support frame 2. The controller converts the measured value into an electrical signal, and then controls the output end of the gearbox 14 to decelerate through the controller signal, thereby reducing the feed speed of the core sample on the conveyor belt 12. This achieves the effect of reducing the scanning speed when the core sample diameter increases, further ensuring the scanning imaging effect. Since the circumferential surface area of ​​the large-diameter core sample is larger, the surface texture, cracks, markers and other features are distributed over a wider range. If the forward speed is too fast, the acquisition frequency of the scanning equipment will not be able to match, resulting in a decrease in the sampling point density per unit length, and surface features will be missed or blurred. Furthermore, during the process of the hydraulic rod 15 pushing the arc-shaped support frame 2 upward, the arc-shaped support frame 2 drives the adjusting ring 5 to move upward synchronously. Since, in the initial state, under the action of the return spring 213, the slide rod 211 pushes the camera unit 21 closer to the axis of the arc-shaped support frame 2, and simultaneously, the slide rod 211, through the second connecting rod 51, pushes the adjusting ring 5 to maintain contact with the inclined block 16, thus, during the upward movement of the adjusting ring 5, the adjusting ring 5 can slide laterally along the inclined surface of the inclined block 16. Therefore, the adjusting ring 5, through the second connecting rod 51, pushes the slide rod 211 away from the inclined surface. The sliding of one side of the axis of the arc-shaped support frame 2 causes the slide rod 211 to move the camera unit 21 away from the axis of the arc-shaped support frame 2. This allows the position of the camera unit 21 to be adjusted according to the diameter of the core sample. The larger the diameter of the core sample, the farther the camera unit 21 moves away from the axis of the arc-shaped support frame 2. This ensures that the distance between the core sample and the camera unit 21 is always kept within the focusing range, thereby ensuring the clarity of the scanning image. This avoids the situation in the existing technology where the automatic focusing of the equipment cannot adapt to changes in the diameter of the core sample, resulting in poor imaging effect. Under the action of the positioning mechanism, when the conveyor belt 12 transports the core sample into the arc-shaped support frame 2, the second electric push rod 33 is activated to extend, causing the swing rod 3 to drive the roller 31 to abut against the core sample. The swing rod 3 pushes the light shield 4 to rotate at a certain angle. Since the opening 41 on the light shield 4 is directly opposite the lighting unit 22 in the initial state, after the light shield 4 rotates, the opening 41 is misaligned with the lighting unit 22, thereby partially blocking the light from the lighting unit 22, thus achieving the effect of changing the lighting intensity. When the diameter of the core sample is larger, the swing rod 3 drives the roller 31 to rotate more... The earlier the light shield 4 comes into contact with the core sample, the smaller the rotation angle of the light shield 4, and the less the light shield 4 blocks the illumination unit 22. At this time, the illumination intensity is greater. Similarly, when the core sample diameter is smaller, the light shield 4 blocks the illumination unit 22 more, and the illumination intensity is lower. This achieves the effect of adaptively adjusting the illumination intensity according to the core sample diameter, avoiding the situation of local imaging shadows due to insufficient light coverage when scanning large-diameter core samples, and avoiding the situation of image overexposure due to excessive illumination intensity when scanning small-diameter core samples.

[0035] Example 2: This embodiment provides a scalable continuous transmission scanning imaging method for the surface morphology of concrete and rock core samples, implemented using the device described in Embodiment 1. The specific steps are as follows: S1: Based on the length of the core sample to be scanned, at least one scanning imaging device is linearly connected through the docking hole 112 and docking post 113 of the extension frame 11; S2: Place the core sample to be scanned on the conveyor belt 12, so that the axis of the core sample is parallel to the conveying direction of the conveyor belt 12; S3: Based on the diameter of the core sample, the arc-shaped support frame 2 is driven to move upward by the hydraulic rod 15 by a distance equal to the radius of the core sample; S4: During the upward movement of the arc-shaped support frame 2, the adjusting ring 5 slides laterally along the inclined surface of the inclined block 16, and pushes the slide rod 211 through the second connecting rod 51 to drive the camera unit 21 to move radially outward, so that the distance between the camera unit 21 and the core sample surface is kept within the focusing range. S5: The laser rangefinder 23 detects the upward movement distance of the arc support frame 2 in real time. The controller controls the gearbox 14 to adjust the conveying speed of the conveyor belt 12 according to the distance. The larger the core sample diameter, the slower the conveying speed. S6: Start the second electric push rod 33 to drive the swing rod 3 to swing, so that the roller 31 abuts against the core sample and completes coaxial positioning. At the same time, the swing rod 3 drives the light shield 4 to rotate through the first connecting rod 32, and adjusts the lighting intensity of the lighting unit 22. S7: Start the conveyor belt 12 and all camera units 21 to continuously scan and image the core sample surface.

[0036] Furthermore, in step S3, when the core sample is a variable diameter core sample, the change in the core sample diameter is detected in real time by a pressure sensor installed on the roller 31, and the controller adjusts the extension and retraction of the hydraulic rod 15 in real time according to the pressure signal so that the axis of the arc support frame 2 always coincides with the axis of the core sample.

[0037] Furthermore, in step S5, the controller has a pre-stored table of the correspondence between the core sample diameter and the conveying speed. When the laser rangefinder 23 detects that the upward movement distance of the arc support frame 2 is h, the controller queries the corresponding table and adjusts the conveying speed of the conveyor belt 12 to v=k / h, where k is a preset constant.

[0038] Furthermore, in step S7, multiple docked scanning imaging devices achieve speed synchronization of conveyor belt 12 and acquisition synchronization of camera unit 21 through a synchronization controller, and the scanned images of two adjacent devices are stitched together through preset marker points.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A scalable, continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples, characterized in that, Includes a base (1), a hydraulic rod (15) is installed on the outer wall of the middle part of the base (1), an arc-shaped support frame (2) is fixed at the output end of the hydraulic rod (15), and a scanning mechanism and a positioning mechanism are provided on the arc-shaped support frame (2); The scanning mechanism includes several equidistant circularly distributed sliding rods (211) that are slidably inserted into the outer wall of the arc-shaped support frame (2). Each sliding rod (211) is equipped with a camera unit (21) on the outer wall of one end extending to the inner side of the arc-shaped support frame (2). Each sliding rod (211) is rotatably connected to a second connecting rod (51) on the outer wall of one end located outside the arc-shaped support frame (2). An adjusting ring (5) is slidably sleeved on the outer wall of the arc-shaped support frame (2). The end of each second connecting rod (51) away from the sliding rod (211) is rotatably connected to the outer wall of the adjusting ring (5). A laser rangefinder (23) for measuring the upward movement distance of the arc-shaped support frame (2) is installed on the bottom outer wall of the arc-shaped support frame (2). The laser rangefinder (23) is electrically connected to the gearbox (14) through a controller. An inclined block (16) that can abut against the adjusting ring (5) is provided on the outer wall of the base (1).

2. The scalable continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples according to claim 1, characterized in that: The positioning mechanism includes several swing rods (3) rotatably connected to the inner wall of the arc-shaped support frame (2). Several lighting units (22) are equidistantly distributed in a circle on the inner wall of the arc-shaped support frame (2). A light shield (4) sleeved on the outside of the lighting unit (22) is rotatably connected to the inner wall of the arc-shaped support frame (2). A roller (31) for abutting the core sample is rotatably connected to the outer wall of the end of each swing rod (3) near the axis of the arc-shaped support frame (2).

3. The scalable continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples according to claim 2, characterized in that: Several of the aforementioned swing rods (3) are equidistantly distributed around the axis of the arc-shaped support frame (2), and a second electric push rod (33) is rotatably connected to the outer wall of one of the swing rods (3), and the output end of the second electric push rod (33) is rotatably connected to the inner wall of the arc-shaped support frame (2).

4. The scalable continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples according to claim 3, characterized in that: Each of the swing rods (3) is rotatably connected to a first connecting rod (32) on its outer wall. The end of each first connecting rod (32) away from the swing rod (3) is rotatably connected to the outer wall of the light shield (4). The outer wall of the light shield (4) has a plurality of equidistant circumferentially distributed openings (41).

5. The scalable continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples according to claim 1, characterized in that: Each of the slide rods (211) has a boss (212) on the outer wall of one end of the arc support frame (2). A return spring (213) is provided between the outer wall of each boss (212) and the outer wall of the arc support frame (2). The return spring (213) is sleeved on the outer wall of the slide rod (211).

6. The scalable continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples according to claim 1, characterized in that: A pair of conveyor belts (12) symmetrically distributed on both sides of the arc-shaped support frame (2) are provided on the outer wall of the base (1). A gearbox (14) is installed on the outer wall of the base (1). The output end of the gearbox (14) is connected to the shaft of the conveyor belt (12). A motor (13) is provided at the input end of the gearbox (14).

7. The scalable continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples according to claim 6, characterized in that: The base (1) is equipped with a first electric push rod (111) on both ends of the outer wall. Each first electric push rod (111) is equipped with an extension frame (11) on the outer wall of its output end. The two extension frames (11) are rotatably connected to the top outer wall of each extension frame (11). The roller (114) and the conveyor belt (12) are located in the same plane.

8. The scalable continuous transmission scanning imaging device for the surface morphology of concrete and rock core samples according to claim 7, characterized in that: One of the extension frames (11) has a docking hole (112) on its outer wall, and the other extension frame (11) has a docking post (113) on its outer wall.

9. A scalable continuous transmission scanning imaging method for the surface morphology of concrete and rock core samples, implemented using the continuous transmission scanning imaging device described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Based on the length of the core sample to be scanned, at least one scanning imaging device is linearly connected through the docking hole (112) and docking post (113) of the extension frame (11); S2: Place the core sample to be scanned on the conveyor belt (12) so that the axis of the core sample is parallel to the conveying direction of the conveyor belt (12); S3: Based on the diameter of the core sample, the arc support frame (2) is driven to move upward by a distance equal to the radius of the core sample through the hydraulic rod (15); S4: During the upward movement of the arc support frame (2), the adjusting ring (5) slides laterally along the inclined surface of the inclined block (16), and pushes the slide rod (211) through the second connecting rod (51) to drive the camera unit (21) to move radially outward, so that the distance between the camera unit (21) and the core sample surface is kept within the focusing range; S5: The laser rangefinder (23) detects the upward movement distance of the arc support frame (2) in real time. The controller controls the gearbox (14) to adjust the conveying speed of the conveyor belt (12) according to the distance. The larger the core sample diameter, the slower the conveying speed. S6: Start the second electric push rod (33) to drive the swing rod (3) to swing, so that the roller (31) abuts against the core sample and completes coaxial positioning. At the same time, the swing rod (3) drives the light shield (4) to rotate through the first connecting rod (32) to adjust the lighting intensity of the lighting unit (22). S7: Start the conveyor belt (12) and all camera units (21) to continuously scan and image the core sample surface.

10. The scalable continuous transmission scanning imaging method for the surface morphology of concrete and rock core samples according to claim 9, characterized in that, In step S3, when the core sample is a variable diameter core sample, the change in the core sample diameter is detected in real time by the pressure sensor installed on the roller (31), and the controller adjusts the extension and retraction of the hydraulic rod (15) in real time according to the pressure signal so that the axis of the arc support frame (2) always coincides with the axis of the core sample. In step S5, the controller has a pre-stored table of the correspondence between the core sample diameter and the conveying speed. When the laser rangefinder (23) detects that the upward movement distance of the arc support frame (2) is h, the controller queries the corresponding table and adjusts the conveying speed of the conveyor belt (12) to v=k / h, where k is a preset constant. In step S7, multiple docked scanning imaging devices achieve speed synchronization of the conveyor belt (12) and acquisition synchronization of the camera unit (21) through a synchronization controller, and the scanned images of two adjacent devices are stitched together through preset marker points.

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