Sound wave detection equipment for mural hollowing

Abstract

The embodiment of the utility model discloses sound wave detection equipment for mural hollowing, which is used for researching mural hollowing damage and providing quantifiable reference data for mural health diagnosis, repair and protection, and relates to the technical field of nondestructive detection. The sound wave detection equipment comprises a sound wave detection mechanism, a lifting translation mechanism and a portal frame; a lifting translation mechanism is fixedly mounted on a frame of the portal frame, and a sound wave detection mechanism is fixedly mounted on the lifting translation mechanism; wherein the sound wave detection mechanism comprises a bottom plate, a sound wave emission device, a distance measurement device, a first control device and a second control device; a first supporting plate is fixedly installed on the lower portion of the bottom plate, a second supporting plate is fixedly installed on the upper portion of the bottom plate, and a partition plate is arranged between the first supporting plate and the second supporting plate. The embodiment of the utility model is suitable for the detection scene of the mural hollowing damage.

Description

Technical Field

[0001] The utility model relates to the technical field of non-destructive testing, in particular to an acoustic wave detection device for hollowing of murals. Background Art

[0002] As a treasure of history and culture, murals contain rich historical information on humanities, religion, economy, life, etc. However, after thousands of years of wind and rain, murals have different degrees of damage, among which cracking, peeling, pigment layer shedding, blisters, fissures, salt frost, and alkali can be seen directly, while mural hollowing mainly occurs between the ground layer and the support. Due to the loss or weakening of the bonding performance, the ground layer is partially separated from the support, which is not directly visible in the mural damage. In addition, hollowing can cause the surface of the mural to crack and bulge, resulting in large-scale falling off of the mural, which is not conducive to the scientific protection of the mural. Therefore, it is necessary to scientifically and rationally conduct defect characteristics research on mural hollowing to provide a scientific basis for the restoration and protection of mural cultural relics;

[0003] Practice has shown that the traditional method of knocking on walls to identify sound defects is very practical and effective in determining whether murals have hollowing defects. However, this method currently relies on personal inference, which is subject to significant subjective influence and prone to misjudgment. Unlike direct detection methods based on knocking, this method uses sound waves to stimulate the murals and studies their response at different frequencies. Utility Model Content

[0004] In view of this, the utility model proposes an acoustic wave detection device for mural hollowing, which can study the response of murals at different frequencies and provide a quantifiable reference basis for the health diagnosis, restoration and protection of murals.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An embodiment of the utility model provides an acoustic wave detection device for hollowing of murals, the device comprising: an acoustic wave detection mechanism, a lifting and translation mechanism and a gantry; the lifting and translation mechanism is fixedly mounted on the frame of the gantry, and the acoustic wave detection mechanism is fixedly mounted on the lifting and translation mechanism; wherein the acoustic wave detection mechanism comprises: a base plate, an acoustic wave emitting device, a distance measuring device, a first control device and a second control device; a first support plate is fixedly mounted on the lower part of the base plate, a second support plate is fixedly mounted on the upper part, and a partition is provided between the first support plate and the second support plate; the acoustic wave emitting device is fixedly connected to the first support plate, the distance measuring device is fixedly connected to the partition, and the front end of the distance measuring device and the front end of the acoustic wave directing device are aligned on a plane perpendicular to the first support plate; the first control device is fixedly connected to the second support plate, and the second control device is fixedly connected to the partition.

[0007] Optionally, the sound wave emitting device includes: a cylinder, a speaker, a sound wave directing device, and a power amplifier; the cylinder is disposed between the first support plate and the partition plate and fixedly connected to the first support plate; the speaker and the sound wave directing device are an integrated structure, disposed inside the cylinder, and both ends extend through the outer surface of the cylinder; the front end of the sound wave directing device and the front end of the ranging device are aligned on a plane perpendicular to the first support plate;

[0008] The sound wave emitting device also includes: a sliding module; the sliding module includes: a push rod, a sliding platform, a sliding platform fixing part and a cylinder; the push rod is slidably connected to the sliding platform and can be used to assist the sound wave direction-directing device to achieve sound wave emission distance control; the sliding platform is fixedly connected to the sliding platform fixing part and the cylinder, and the sliding platform fixing part and the cylinder are an integrated structure and are electrically connected to the second control device; the sliding module is arranged between the sound wave emitting device and the base plate, and is fixedly connected to the first support plate through the sliding platform fixing part.

[0009] Optionally, the speaker and the sound wave directing device are an integrated structure, extending out of both sides of the cylinder, and limiting members are provided on both sides; a return spring is fixedly connected to the inside of the cylinder; the sound wave directing device extends out of the outer surface of the cylinder through the return spring, and the power amplifier is installed on the outer surface of the cylinder.

[0010] Optionally, a first buffer pad is provided on the sound wave directing device at the contact point with the return spring, and a second buffer pad is provided at the contact point with the left limit member, for buffering the movement of the speaker and the sound wave directing device.

[0011] Optionally, the sound wave detection mechanism also includes: a data acquisition device; the data acquisition device includes: an acoustic sensor, a sensor fixing and adjustment module, and a data acquisition instrument; the sensor is fixedly connected to the sensor fixing and adjustment module and connected to the data acquisition instrument; the data acquisition instrument is placed outside the sound wave detection equipment for mural hollowing and is connected to a computer; the data acquisition device is used to control the triggering of the data acquisition instrument to collect sound wave data through the sensor while the first control device controls the sound wave emitting device to emit sound waves to detect murals.

[0012] Optionally, the sensor fixing and adjustment module includes: a base, a first connecting rod, a second connecting rod, a connecting piece, a fastener, and a sensor fixing component; the base is fixedly arranged on the bottom plate, and a fixing groove connected to the first connecting rod is provided on the base; the first end of the first connecting rod is connected to the fixing groove, and the second end is connected to the first side of the connecting piece; the second connecting rod is vertically connected to the second side of the connecting piece; the sensor fixing component is connected to the second connecting rod, which is used to fix the acoustic sensor connected to the data acquisition instrument; the fasteners are provided on the side of the fixing groove and at both ends of the connecting piece, for fastening the connecting rod.

[0013] Optionally, the lifting and translation mechanism includes: a slide rail, a lifting component, a translation component and a motor; the motor is fixedly arranged on the outside of the slide rail and is electrically connected to the first control device; the slide rail includes a vertical slide rail and a horizontal slide rail, and the lifting component is connected to the vertical slide rail; the translation component is connected to the horizontal slide rail, and the horizontal slide rail is horizontally arranged on the vertical slide rail through the lifting component; the lifting component and the translation component are also connected to a motor that drives the lifting component and the translation component to move.

[0014] Optionally, the gantry is a profile, and corner seats are fixedly connected to the four corners of the gantry for connecting the profile; universal wheels are fixedly connected to both sides of the bottom of the gantry for achieving free movement of the acoustic wave detection equipment for hollowing of murals.

[0015] Optionally, the first support plate, the partition plate and the second support plate are fixed by columns.

[0016] The utility model provides an acoustic wave detection device for hollowing of murals. The acoustic wave detection mechanism is fixedly connected to a lifting and translation mechanism and a gantry in sequence. The acoustic wave detection mechanism comprises a base plate, an acoustic wave emitting device, a distance measuring device, a first control device, and a second control device. The acoustic wave detection mechanism is moved by the lifting and translation mechanism to facilitate better data collection. The first control device controls the acoustic wave emitting device to operate, and the second control device controls the distance measuring device to collect and analyze data, and draws a hollowing defect map of the mural. Therefore, the mural is stimulated by the acoustic wave detection mechanism, the response of the mural at different frequencies is studied, and a quantitative evaluation method corresponding to the actual situation is given. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure of an acoustic wave detection device for hollowing of murals provided in one embodiment of the present utility model;

[0019] Figure 2 A schematic diagram of the structure of an acoustic wave detection mechanism provided in one embodiment of the present utility model;

[0020] Figure 3 A schematic structural diagram of a sound wave emitting device provided in one embodiment of the present utility model;

[0021] Figure 4 A right side view of the sound wave emitting device provided in one embodiment of the present utility model;

[0022] Figure 5 A schematic structural diagram of a sound wave emitting device provided in another embodiment of the present invention;

[0023] Figure 6 A schematic structural diagram of an acoustic wave detection device for hollowing of murals provided in yet another embodiment of the present invention;

[0024] Figure 7 A schematic diagram of a mural acoustic wave detection method provided by an embodiment of the present utility model;

[0025] In the figure: 1. acoustic wave detection mechanism; 2. lifting and translation mechanism; 3. gantry; 4. bottom plate; 5. acoustic wave emitting device; 6. distance measuring device; 7. first control device; 8. second control device; 9. first support plate; 10. second support plate; 11. partition; 12. through hole; 13. cylinder; 14. speaker; 15. acoustic wave directing device; 16. sliding module; 17. push rod; 18. sliding platform; 19. sliding platform fixing member; 20. cylinder; 21. limit member; 211. limit pin hole; 212. limit ring; 22. return spring; 23. power amplifier; 24. first buffer pad; 25. second buffer pad; 26. sensor fixing and adjustment module; 27. base; 271. Fixing slot; 28. First connecting rod; 29. ​​Second connecting rod; 30. Connecting piece; 31. Fastener; 311. First fastening screw; 312. Steering screw; 313. Second fastening screw; 32. Sensor fixing part; 33. Slide rail; 331. Vertical slide rail; 332. Horizontal slide rail; 34. Lifting part; 35. Translation part; 36 (361 and 362) motor; 37. Angle seat; 38. Universal wheel; 39. Column. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0028] The embodiment of the present utility model provides an acoustic wave detection device for mural hollowing, which can study the response to mural hollowing diseases at different frequencies and provide a quantifiable reference basis for the health diagnosis, repair and protection of murals.

[0029] The present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0030] See Figure 1 、 Figure 2The embodiment of the utility model provides an acoustic wave detection device for hollowing of murals, comprising: an acoustic wave detection mechanism 1, a lifting and translation mechanism 2 and a gantry 3; the lifting and translation mechanism 2 is fixedly mounted on the frame of the gantry 3, and the acoustic wave detection mechanism 1 is fixedly mounted on the lifting and translation mechanism 2; wherein the acoustic wave detection mechanism 1 comprises: a base plate 4, an acoustic wave emitting device 5, a distance measuring device 6, a first control device 7, and a second control device 8; a first support plate 9 is fixedly mounted on the lower part of the base plate 4, a second support plate 10 is fixedly mounted on the upper part, and a partition plate 11 is provided between the first support plate and the second support plate; the acoustic wave emitting device 5 is fixedly connected to the first support plate 9, and the distance measuring device 6 is fixedly connected to the partition plate 11; the first control device 7 is fixedly connected to the second support plate 10, and the second control device 8 is fixedly connected to the partition plate 11;

[0031] Among them, the bottom plate and the fixed plate are both provided with through holes 12 for fixing the acoustic wave detection mechanism 1 to the lifting and translation mechanism 2 by fasteners, and the fasteners can be fastening components such as bolts and screws; the second support plate is an L-shaped steel plate, and the first support plate, the partition plate and the second support plate are arranged in parallel from bottom to top, and the partition plate is arranged in the left area between the first support plate and the second support plate; the acoustic wave emitting device 5 is fixedly connected to the left area of ​​the first support plate 9, that is, just below the partition plate 11, and the ranging device 6 is fixedly connected to the front end of the partition plate 11, and the front end of the ranging device 6 and the front end of the acoustic wave emitting device 5 are perpendicular to the first support plate. The first control device 7 is fixedly connected to the second support plate 10, and the second control device 8 is fixedly connected to the rear end of the partition 11. The first control device 7 is electrically connected to the sound wave emitting device 5 through the power amplifier 23 to control the sound wave emitting device 5 to emit sound waves; the second control device 8 is electrically connected to the distance measuring device 6 to control the distance measuring device 6 to measure the distance to the mural; wherein, the distance measuring device in the embodiment of the utility model can be a distance measuring device such as a distance measuring sensor, which will not be described in detail here.

[0032] The utility model provides an acoustic wave detection device for hollowing of murals. The acoustic wave detection mechanism is fixedly connected to a lifting and translation mechanism and a gantry in sequence. The acoustic wave detection mechanism comprises a base plate, an acoustic wave emitting device, a distance measuring device, a first control device, and a second control device. The acoustic wave detection mechanism is moved by the lifting and translation mechanism to facilitate better data collection. The first control device controls the acoustic wave emitting device to operate, and the second control device controls the distance measuring device to collect and analyze data, and draws a hollowing defect map of the mural. Therefore, the mural is stimulated by the acoustic wave detection mechanism, the response of the mural at different frequencies is studied, and a quantitative evaluation method corresponding to the actual situation is given.

[0033] See Figure 2 、 Figure 3In some embodiments, the sound wave emitting device 5 includes: a cylinder 13, a speaker 14, a sound wave directing device 15, and a power amplifier 23; the cylinder 13 is disposed between the first support plate 9 and the partition plate 11 and is fixedly connected to the first support plate 9; the speaker 14 and the sound wave directing device 15 are an integrated structure, disposed inside the cylinder 13, and both ends thereof pass through the outer surface of the cylinder 13; the front end of the sound wave directing device 15 and the front end of the ranging device 6 are aligned on a plane perpendicular to the first support plate 9;

[0034] The sound wave emitting device 5 also includes: a sliding module 16; the sliding module 16 includes: a push rod 17, a sliding platform 18, a sliding platform fixing part 19 and a cylinder 20; the push rod 17 is slidingly connected to the sliding platform 18, and can be used to assist the sound wave directing device 15 to realize the sound wave emission distance control; the sliding platform 18 is fixedly connected to the sliding platform fixing part 19 and the cylinder 20, and the sliding platform fixing part 19 and the cylinder 20 are an integrated structure and are electrically connected to the second control device 9; the sliding module 16 is arranged between the sound wave emitting device and the base plate, and is fixedly connected to the first support plate through the sliding platform fixing part 19.

[0035] The sliding module 16 of this embodiment is arranged at the rear end of the sound wave emitting device 5 and is fixedly connected to the first support plate 9 through the sliding platform fixing member 19. The distance data from the mural to the sound wave detection mechanism 1 is measured by the distance measuring device 6. The second control device 8 controls the push rod 17 on the sliding platform 18 to slide forward by controlling the air flow and exhaust of the cylinder 20, pushing the speaker 14 and the sound wave directing device 15 forward, and adjusting the distance between the speaker 14 and the sound wave directing device 15 so that the position from the mural is fixed each time working.

[0036] Specifically, before performing mural hollowing detection, the sound wave frequency range of the sound wave emitting device 5 and the target distance to the mural are predetermined to ensure that the position of the mural is fixed each time it is stimulated; when performing mural hollowing detection, the second control device 8 is first used to control the distance measuring device 6 to measure the distance from the sound wave directing device 15 to the mural. If the mural is dented or other reasons cause the target distance from the sound wave directing device 15 to the mural to change, the second control device 8 controls the cylinder 20 of the sliding module 16, thereby controlling the push rod 17 to start working, pushing the speaker 14 and the sound wave directing device 15 forward, so that the distance from the sound wave directing device 15 to the mural is the target distance, ensuring that the target distance is the same each time the sound wave is excited. When the work within the specific frequency range is completed, the second control device 8 controls the cylinder 20 to reset the push rod 17 and wait for the next grid change to work.

[0037] See Figure 3In some embodiments, the speaker 14 and the sound wave directing device 15 are an integrated structure, extending out of both sides of the cylinder 13, and both sides are provided with limit members 21 (211 and 212); a return spring 22 is fixedly connected to the inside of the cylinder 13; the sound wave directing device 15 extends out of the outer surface of the cylinder 13 through the return spring 22, and the power amplifier 23 is installed on the outer surface of the cylinder 13; wherein, the limit member includes a limit pin hole 211 and a limit ring 212, and the limit pin hole is opened at one end of the cylinder facing outward and does not pass through the surface of the cylinder 13.

[0038] See Figure 3 、 Figure 4 In some embodiments, a first buffer pad 24 is provided on the sound wave directing device 15 at the contact point with the return spring 22, and a second buffer pad 25 is provided at the contact point with the left limit member, for cushioning the movement of the speaker 14 and the sound wave directing device 15; wherein the material of the buffer pad includes rubber, thereby reducing the noise generated by the collision with the limit member and preventing interference when collecting sound data.

[0039] Specifically, the sound wave frequency range of the sound wave emitting device 5 and the target distance to the mural are predetermined to ensure that the position of the mural is fixed each time it is stimulated; when working, the sound wave emitting device 5 is used to stimulate the mural for detection. During the detection, the second control device 8 is first used to control the distance measuring device 6 to measure the distance from the sound wave directing device 15 to the mural. When it is detected that the target distance from the sound wave directing device 15 to the mural changes, the second control device 8 controls the cylinder 20 of the sliding module 16, thereby controlling the push rod 17 to start working and push the sound wave directing device 15 forward so that the distance from the sound wave directing device 15 to the mural is the target distance, ensuring that the target distance is the same during each detection. During this process, the reset spring 22 is compressed. When the work within the specific frequency range is completed, the second control device 8 controls the cylinder 20 to realize the reset of the push rod 17. The reset spring 22 assists the reset of the sound wave directing device 15. The first buffer pad 24 and the second buffer pad 25 buffer the movement of the speaker 14 and the sound wave directing device 15 to prevent interference when collecting sound data. Waiting for the next grid change to work; after adjusting to the target distance, the first control device 7 is electrically connected to the sound wave emitting device 5 through the power amplifier 23 to control the sound wave emitting device 5 to emit sound waves of a specified waveform within a certain frequency range.

[0040] In some embodiments, the acoustic wave detection mechanism 1 also includes: a data acquisition device (not shown in the figure); the data acquisition device includes: an acoustic sensor (not shown in the figure), a sensor fixing and adjustment module 26, and a data acquisition instrument (not shown in the figure); the acoustic sensor is fixedly connected to the sensor fixing and adjustment module 26 and connected to the data acquisition instrument; the data acquisition instrument can be set outside the acoustic wave detection equipment according to the needs of the on-site use environment, and connected to an external computer for data processing. The data acquisition instrument and the acoustic sensor are connected by a cable, which can trigger the data acquisition instrument to collect data while realizing acoustic wave detection.

[0041] In some embodiments, the sensor fixing and adjustment module 26 includes: a base 27, a first connecting rod 28, a second connecting rod 29, a connector 30, a fastener 31, and a sensor fixing component 32; the base 27 is fixedly arranged on the bottom plate 4, and a fixing groove 271 connected to the first connecting rod 28 is provided on the base 27; the first end of the first connecting rod 28 is connected to the fixing groove, and the second end is connected to the first side of the connector 30; the second connecting rod 29 is vertically connected to the second side of the connector 30; the second connecting rod 29 is connected to the sensor fixing component 32 for fixing the acoustic sensor connected to the data acquisition instrument The fastener 31 is provided on the side of the fixing groove 271 and at both ends of the connecting member 30 for fastening the connecting rod; the fastener 31 includes: a first fastening screw 311, a steering screw 312 and a second fastening screw 313; the first fastening screw 311 is provided on the side of the fixing groove 271 and on both sides of the connecting member 30 for fastening the connecting rod; the steering screw 312 is provided at the lower end of the connecting member 30 for realizing relative rotation between the first side and the second side of the connecting member 30; the second fastening screw 313 is provided on the top of the sensor fixing component 32 for fixing the acoustic sensor connected to the data acquisition instrument.

[0042] See Figure 2 、 Figure 5In this embodiment, the sensor fixing and adjustment module 26 is arranged on the right side of the bottom plate 4 and the first support plate 9, and the base 27 is fixed to the bottom plate 4 by bolts. The base 27 is provided with a fixing groove 271, and the first end of the first connecting rod 28 can be inserted into the fixing groove 271. The remaining length of the first connecting rod 28 can be adjusted by the depth of the insertion. The other end of the first connecting rod 28 is connected to the connecting piece 30. The connecting piece 30 can change the position of the sensor fixing component connected to the second connecting rod 29 by changing the position of the remaining length set on the first connecting rod 28; the second connecting rod 29 is connected to the connecting rod On the other side of the connector 30 opposite the first connecting rod 28, fasteners 31 are located on the sides of the fixing slot and at both ends of the connector 30, used to tighten the connecting rod and adjust the distance between the connecting rods to adjust the position of the sensor fixing component. A first fastening screw 311 is located on the sides of the fixing slot 271 and on both sides of the connector 30, used to tighten the connecting rod. A steering screw 312 is located at the lower end of the connector 30, used to enable relative rotation between the first and second sides of the connector 30. A second fastening screw 313 is located at the top of the sensor fixing component 32, used to secure the acoustic sensor connected to the data acquisition device. The first and second connecting rods 28 and 29 can rotate within the connector 30, allowing the acoustic sensor to be fixed at different angles. Specifically, the data acquisition device is used to collect data when the sound wave emitting device 5 excites the mural. The acoustic sensor is fixed in a suitable position by pre-installing the connecting rod, the connecting piece 30 and the sensor fixing component 32. When the first control device 7 controls the sound wave emitting device 5 to emit sound waves, the sensor in the sensor fixing component 32 is controlled by an external computer to operate and collect detection data.

[0043] In other embodiments, the second connecting rod 29 is further connected to other connecting members, and other connecting members are further connected to other connecting rods, so as to fix the data acquisition device at different positions.

[0044] In this embodiment, see Figure 5 As shown, a sensor fixing component 32 is connected to the second connecting rod. An acoustic sensor is fixed in sensor fixing component 32. The acoustic sensor can be a high-precision sound pressure sensor. The sensor is connected to the data acquisition device via a cable, which can trigger the data acquisition device to collect data while performing sound wave detection. In some embodiments, by adding connectors 30 and connecting rods, multiple sensor fixing components 32 can be fixed in different positions, enabling multi-sensor data collection and improving on-site detection efficiency.

[0045] See Figure 1 、 Figure 6In some embodiments, the lifting and translation mechanism 2 includes: a slide rail 33, a lifting component 34, a translation component 35 and a motor 36; the motor 36 (361 and 362) is fixedly arranged on the outside of the slide rail 33 and is electrically connected to the first control device 7; the slide rail 33 includes a vertical slide rail 331 and a horizontal slide rail 332, and the lifting component 34 is connected to the vertical slide rail 331; the translation component 35 is connected to the horizontal slide rail 332, and the horizontal slide rail 332 is horizontally arranged on the vertical slide rail 331 through the lifting component 34; the lifting component 34 and the translation component 35 are also connected to the motor 36 that drives the lifting component and the translation component to move.

[0046] In this embodiment, see Figure 6 As shown, the slide rails 33 of the lifting and translation mechanism 2 include vertical slide rails 331 fixed to the frames on both sides of the gantry 3 and horizontal slide rails 332 arranged laterally on the vertical slide rails 331. Both ends of each slide rail 33 are provided with limit members to ensure safe sliding on the slide rails 33. A lifting member 34 is installed on the vertical slide rail 331, and a translation member 35 is installed on the horizontal slide rail 332. A motor 36 is also fixedly provided on the outer side of each slide rail 33.

[0047] Specifically, the lifting and translation mechanism 2 is used to assist the lifting and translation of the acoustic wave detection mechanism 1. The lifting and translation of the acoustic wave detection mechanism 1 is realized by controlling the movement of the lifting component 34 on the vertical slide rail 331 by the motor 36, and the translation of the acoustic wave detection mechanism 1 is realized by controlling the movement of the translation component 35 on the horizontal slide rail 332 by the motor 36.

[0048] See Figure 1 、 Figure 6 In some embodiments, the gantry 3 is a profile, and the four corners of the gantry 3 are fixedly connected with corner seats 37 for connecting the profile; both sides of the bottom of the gantry 3 are fixedly connected with universal wheels 38 for realizing the free movement of the acoustic wave detection equipment for hollowing of murals; wherein, the use of corner seats can ensure the load-bearing capacity while taking into account the stability of the gantry support; the use of universal wheels on both sides of the bottom realizes the free movement of the gantry on the placement surface.

[0049] See Figure 2 In some embodiments, the first support plate 9, the partition plate 11 and the second support plate 10 are fixed by pillars 39; in this way, the use of pillars for fixing can improve the stability of the ultrasonic frequency sweep detection equipment, and at the same time, the height and width can be flexibly adjusted according to actual usage needs, making it convenient to place equipment with multiple functions.

[0050] It should be understood that operators can achieve acoustic wave detection of mural hollowing at a higher distance by adding profiles to the gantry in the vertical direction according to the needs of the on-site environment. Example 2

[0051] A method for detecting hollowing in a mural with an acoustic wave may be implemented using the mural hollowing detection device of the above embodiment. The method of this embodiment may include the following steps:

[0052] S11. Determine a grid size based on the expected hollowing accuracy of the mural, divide the mural area to be tested into grids based on the grid size, and determine the horizontal and vertical movement distances of the acoustic wave detection mechanism on the lifting and translation mechanism;

[0053] S12, moving the acoustic wave detection device for mural hollowing to the front of the mural area to be detected, and adjusting the front end of the acoustic wave directional device to align with the center of the first target detection grid at a target distance; the target distance is a predetermined distance between the front end of the acoustic wave directional device and the mural to be detected;

[0054] S13, obtaining the distance from the front end of the acoustic wave direction-finding device to the first target detection grid by a distance-measuring device, and adjusting the moving distance of the acoustic wave direction-finding device according to the difference between the target distance and the distance from the front end of the acoustic wave direction-finding device to the first target detection grid, so that the distance from the front end of the acoustic wave direction-finding device to the first target detection grid is the target distance;

[0055] S14, starting the sound wave emitting device and the data collecting device, emitting sound waves of a specific waveform and frequency within a specific range to each mural in the first target detection grid and collecting data;

[0056] S15. After the first target detection grid is completed, move to the next target detection grid according to a predetermined moving distance. After moving to the designated target detection grid, transmit and sample the sound waves according to the target distance so that the position of each sound wave emission is fixed until the sound wave emission and data collection of the murals of all target detection grids are completed;

[0057] S16. Process the collected data to obtain damage indicators corresponding to all target detection grids, and draw a mural hollowing disease defect map based on the damage indicators corresponding to each grid.

[0058] In this embodiment, see Figure 7As shown, before performing acoustic wave detection on the mural to be tested, the appropriate grid size is determined in advance according to the size of the mural area to be tested and the expected hollowing accuracy of the mural, and the mural area to be tested is gridded in a contactless and pollution-free manner according to the grid size. When gridding, the mural area to be tested can be gridded by projecting a laser grid on the mural using a laser, and the error between the actual grid size and the target grid size is controlled within an allowable range. The naming rules of the grid data are determined according to the grid data, for example, "NAXY" represents the sub-grid of the Xth row and Yth column in the Nth column grid A, and the actual distance between each grid is determined to determine the location of the acoustic wave detection mechanism 1 on the lifting level. The horizontal or vertical moving distance of each movement on the moving mechanism 2 is connected to the first control device, the second control device and the data acquisition instrument on the computer, and the moving distance data is set in the first control device 7 according to the grid data; the acoustic wave detection device for mural hollowing is moved to the front of the mural area to be detected, and the acoustic wave detection device is adjusted to align the target distance with the center of the first target detection grid. The target distance is the distance between the front end of the acoustic wave directional device and the mural to be detected, which is usually 1 to 2 cm and is determined according to the on-site conditions; the distance from the front end of the acoustic wave directional device to the target detection grid is obtained by the distance measuring device, and the distance from the front end of the acoustic wave directional device to the first target detection grid is obtained according to the target distance and the distance from the front end of the acoustic wave directional device to the first target detection grid. The difference between the distances is adjusted by the push rod to adjust the moving distance of the sound wave direction device so that the target distance from the sound wave detection equipment to the mural to be detected is the same; the push rod is reset after completing the target detection grid; at the same time, the distance between the sensor and the mural to be detected is determined, and the relative position with the center of the target detection grid is fixed; at this time, the first control device controls the operation of the sound wave emitting device through the power amplifier, and emits sound waves of a specific range, frequency and waveform to the murals in the target detection grid one by one. At the same time, when the first control system issues a start instruction, the computer triggers the data acquisition instrument to collect data through the sensor, and emits sound waves to the murals in the first target detection grid and collects detection data; in the first target detection grid After the grid is completed, it moves to the next target detection grid according to the predetermined horizontal or vertical moving distance. After moving to the designated target detection grid, it performs sampling in a specific range at the same distance as the first target detection grid, so that the position of each sound wave emission is fixed until the sound wave emission and data collection of the murals in all target detection grids are completed; finally, the collected detection data are subjected to noise filtering, pre-emphasis and other processing, and the damage indicators of each grid are obtained through frequency domain analysis, and finally a disease defect map of the mural hollowing detection results is drawn, so that the mural is stimulated by the acoustic wave detection mechanism, the response of the mural at different frequencies is studied, and a quantitative evaluation method corresponding to the actual situation is given.

[0059] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0060] The above content has briefly described the embodiments of the present invention in detail. Those skilled in the art can design and modify the device and its usage within the scope of the present invention according to on-site construction conditions.

[0061] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0062] For the convenience of description, when referring to a system, server, etc., it may be described separately by function as various units / modules. Of course, when implementing the present invention, the functions of each unit / module can be implemented in the same or multiple software and / or hardware.

[0063] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium, and when executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An acoustic wave detection device for hollowing of murals, characterized in that: include: Acoustic wave detection mechanism, lifting and translation mechanism and gantry; A lifting and translation mechanism is fixedly installed on the frame of the gantry, and an acoustic wave detection mechanism is fixedly installed on the lifting and translation mechanism; Among them, the sound wave detection mechanism includes: a base plate, a sound wave emitting device, a ranging device, a first control device, and a second control device; a first support plate is fixedly installed at the lower part of the base plate, and a second support plate is fixedly installed at the upper part, and a partition is provided between the first support plate and the second support plate; the sound wave emitting device is fixedly connected to the first support plate, and the ranging device is fixedly connected to the partition; the first control device is fixedly connected to the second support plate, and the second control device is fixedly connected to the partition.

2. The acoustic wave detection device for mural hollowing according to claim 1 is characterized in that: The sound wave emitting device includes: a cylinder, a speaker, a sound wave directing device, and a power amplifier; the cylinder is disposed between the first support plate and the partition plate and is fixedly connected to the first support plate; the speaker and the sound wave directing device are an integrated structure, disposed inside the cylinder, and both ends extend through the outer surface of the cylinder; the front end of the sound wave directing device and the front end of the ranging device are aligned on a plane perpendicular to the first support plate; The sound wave emitting device also includes: a sliding module; the sliding module includes: a push rod, a sliding platform, a sliding platform fixing part and a cylinder; the push rod is slidably connected to the sliding platform and can be used to assist the sound wave direction-directing device to achieve sound wave emission distance control; the sliding platform is fixedly connected to the sliding platform fixing part and the cylinder, and the sliding platform fixing part and the cylinder are an integrated structure and are electrically connected to the second control device; the sliding module is arranged between the sound wave emitting device and the base plate, and is fixedly connected to the first support plate through the sliding platform fixing part.

3. The acoustic wave detection device for mural hollowing according to claim 2 is characterized in that: The speaker and the sound wave directing device are an integrated structure, extending out of both sides of the cylinder, and both sides are provided with limit members; a return spring is fixedly connected to the inside of the cylinder; the sound wave directing device extends out of the outer surface of the cylinder through the return spring, and the power amplifier is installed on the outer surface of the cylinder.

4. The acoustic wave detection device for mural hollowing according to claim 3 is characterized in that: A first buffer pad is provided on the sound wave directing device at the contact point with the return spring, and a second buffer pad is provided at the contact point with the left limiter, for buffering the movement of the speaker and the sound wave directing device.

5. The acoustic wave detection device for mural hollowing according to claim 1 is characterized in that: The acoustic wave detection mechanism further includes: a data acquisition device; The data acquisition device includes: an acoustic sensor, a sensor fixing and adjustment module, and a data acquisition instrument; the sensor is fixedly connected to the sensor fixing and adjustment module and connected to the data acquisition instrument; the data acquisition instrument is placed outside the sound wave detection equipment for mural hollowing and connected to a computer; the data acquisition device is used to control the triggering of the data acquisition instrument to collect sound wave data through the sensor while the first control device controls the sound wave emitting device to emit sound waves to detect murals.

6. The acoustic wave detection device for mural hollowing according to claim 5, characterized in that: The sensor fixing and adjusting module includes: a base, a first connecting rod, a second connecting rod, a connecting piece, a fastener, and a sensor fixing component; The base is fixedly arranged on the bottom plate, and a fixing groove connected to the first connecting rod is provided on the base; the first end of the first connecting rod is connected to the fixing groove, and the second end is connected to the first side of the connecting member; the second connecting rod is vertically connected to the second side of the connecting member; the sensor fixing component is connected to the second connecting rod, which is used to fix the acoustic sensor connected to the data acquisition instrument; the fasteners are provided on the side of the fixing groove and at both ends of the connecting member, and are used to fasten the connecting rods.

7. The acoustic wave detection device for hollowing of murals according to claim 1, characterized in that: The lifting and translation mechanism includes: a slide rail, a lifting component, a translation component and a motor; the motor is fixedly arranged on the outside of the slide rail and is electrically connected to the first control device; the slide rail includes a vertical slide rail and a horizontal slide rail, and the lifting component is connected to the vertical slide rail; the translation component is connected to the horizontal slide rail, and the horizontal slide rail is horizontally arranged on the vertical slide rail through the lifting component; the lifting component and the translation component are also connected to a motor that drives the lifting component and the translation component to move.

8. The acoustic wave detection device for mural hollowing according to claim 1, characterized in that: The gantry is a profile, and corner seats are fixedly connected to the four corners of the gantry for connecting the profile; universal wheels are fixedly connected to both sides of the bottom of the gantry for realizing the free movement of the acoustic wave detection equipment for mural hollowing.

9. The acoustic wave detection device for hollowing of murals according to claim 1, characterized in that: The first support plate, the partition plate and the second support plate are fixed by pillars.

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