A probe positioning device for concrete crack depth detection

Abstract

The application belongs to the technical field of building construction quality detection, and particularly relates to a probe positioning device for concrete crack depth detection, which comprises a scale plate, the scale plate is made of flexible rubber material, an inflation groove is formed in the back wall of the scale plate, an inflation air bag is fixedly connected to the inner wall of the inflation groove, a side wall on one side of the inflation air bag is fixedly connected with an inflation pipe, one end of the inflation pipe away from the inflation air bag extends out of the scale plate, and a one-way valve is arranged in the inflation pipe. When the placement position of the probe around the concrete crack is determined, the two probes and the crack section to be detected can be vertically placed, the depth data of the crack can be accurately obtained by the probe, the measurement accuracy of the ultrasonic probe is ensured, and when the crack on the curved surface of the concrete building surface is detected, the positioning device can be attached to the curved surface of the concrete building, so that the interference of the curved surface of the concrete on the detection accuracy, stability and integrity is solved.

Description

Technical Field

[0001] This invention belongs to the field of building construction quality inspection technology, and in particular relates to a probe positioning device for detecting the depth of concrete cracks. Background Technology

[0002] Currently, the ultrasonic single-sided flat measurement method is the most common non-destructive testing method for crack depth detection. During the test, two probes are placed on the concrete surface on both sides of the crack, with the crack location as the center, for measurement. To improve the accuracy of the test, multiple measurements are taken at different intervals on both sides of the crack. This requires manually marking lines on the concrete surface beforehand to determine the measurement points, and then applying a coupling agent to the corresponding positions to facilitate the ultrasonic probe's detection. However, the coupling agent can easily cover the marked measurement points, which can cause dimensional deviations in the probe position and affect the accuracy of crack detection. For example, the probe positioning device for concrete crack depth detection proposed in patent publication number CN113587865B.

[0003] The propagation of cracks on the concrete surface is the result of the combined effects of uneven internal and external stress distribution, complex constraint conditions, and differences in material properties. Its propagation path has a significant "preferentiality" and will preferentially extend along the area with the most significant stress concentration and the weakest material strength. When the stress direction or weak area changes abruptly, the crack direction will also change accordingly. This directly leads to the problem that cracks on the concrete surface generally have a large degree of curvature and are difficult to predict in terms of direction.

[0004] Traditional probe positioning devices exhibit significant limitations in addressing this characteristic: Firstly, their angle and position require manual adjustment, which can easily lead to "asymmetrical distribution of the two probes relative to the crack in the vertical direction." This improper distribution can cause the angle between the sound wave propagation direction and the crack to be too large, resulting not only in a significant weakening of the diffraction wave signal but also in the possibility that the sound wave passes directly through the crack without diffraction, ultimately leading to "missed crack detection." Secondly, some concrete structures have curved crack areas with irregular crack directions, while traditional probe positioning components are made of rigid materials that cannot effectively conform to the curved building surface, thus severely affecting the efficiency of determining the probe placement position and further restricting the accuracy and timeliness of crack detection.

[0005] To address this issue, a probe positioning device for detecting the depth of concrete cracks is proposed. Summary of the Invention

[0006] The purpose of this invention is to address the above-mentioned problems by providing a probe positioning device for detecting the depth of concrete cracks.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a probe positioning device for detecting the depth of concrete cracks, comprising a scale plate made of flexible rubber, an inflation groove formed on the rear side wall of the scale plate, an inflation airbag fixedly connected to the inner wall of the inflation groove, an inflation tube fixedly connected to one side wall of the inflation airbag, an end of the inflation tube away from the inflation airbag extending out of the scale plate and having a one-way valve inside, a deflation tube fixedly connected to the side wall of the inflation airbag away from the inflation tube, an end of the deflation tube away from the inflation airbag extending out of the scale plate and having a cap threadedly connected to it, a support groove formed on the rear side wall of the scale plate above the inflation groove, a rubber tube fixedly connected to the inner wall of the support groove, the rubber tube being filled with electrorheological fluid, and further comprising:

[0008] The distance-fixing component, located on the front side wall of the scale plate, is used to determine the placement position of the two ultrasonic probes;

[0009] A fixing component is provided on the side wall of the scale plate for fixing the position of the scale plate;

[0010] The detection component, located on the right side of the front sidewall of the scale plate, is used to detect the wear degree of the two probes.

[0011] Preferably, the distance-fixing assembly includes multiple distance-fixing posts fixedly connected to the front sidewall of the scale plate. A limiting post is fixedly connected to the end of each distance-fixing post away from the scale plate. Two limiting sleeves that match the limiting posts are placed on the front sidewall of the scale plate. A support plate is fixedly connected to the front sidewall of each limiting sleeve. A clamping ring is fixedly connected to the lower end of the support plate. A through hole is opened on the lower sidewall of the clamping ring, and a clamping pin is movably inserted into the through hole. The upper end of the clamping pin is located inside the clamping ring and is fixedly connected to a clamping plate. The lower end of the clamping pin passes through the clamping ring and is fixedly connected to a pull plate. The same spring is fixedly connected between the pull plate and the clamping ring.

[0012] Preferably, the fixing assembly includes a fixing plate fixedly connected to the front sidewall of the scale plate, a fixing frame fixedly connected to the lower end of the fixing plate, a first wedge plate inserted into the fixing frame, a threaded opening at the lower end of the fixing frame, and a fixing bolt threaded into the threaded opening to fix the first wedge plate in the fixing frame. A square plate is fixedly connected to the upper sidewall of the scale plate, a fixing post is fixedly connected to the front sidewall of the square plate, an adjusting ring is rotatably connected to the outer wall of the fixing post via a bearing, a positioning bolt is threaded to the sidewall of the adjusting ring, an adjusting pin is fixedly connected to the sidewall of the adjusting ring, an installation ring is fixedly connected to the end of the adjusting pin away from the adjusting ring, a fixing cylinder is rotatably connected to the inner wall of the installation ring via a bearing, a through-hole is opened on both the upper and lower sidewalls of the fixing cylinder, and the same vertical rod is movably inserted into both through-holes. The lower end of the vertical rod extends out of the fixing cylinder and is fixedly connected to a second wedge plate. A lifting ring is fixedly sleeved on the rod wall of the vertical rod located inside the fixing cylinder, and the same spring is fixedly connected between the lifting ring and the fixing cylinder.

[0013] Preferably, the detection assembly includes a detection plate fixedly connected to the front sidewall of the scale plate, two insert rings fixedly connected to the front sidewall of the detection plate, a detection crack is provided in the middle of the detection plate, the two insert rings are symmetrically arranged about the detection crack, and a friction ring is fixedly connected to the inner wall of the insert ring.

[0014] Preferably, a laser generator and a laser receiver are fixedly connected to the upper side wall of the scale plate, and the laser generator and laser receiver are symmetrically arranged about the fixed plate.

[0015] Preferably, the lower side wall of the limiting sleeve is provided with a locking hole, and a locking pin is inserted into the locking hole. The side wall of the limiting post is provided with a locking groove that matches the locking pin. The lower end of the locking pin is fixedly connected to a horizontal plate, and the horizontal plate and the limiting sleeve are fixedly connected with the same spring.

[0016] Preferably, a microcontroller is fixedly connected to the right side wall of the scale plate, and the laser receiver is electrically connected to the microcontroller.

[0017] Preferably, a buzzer is fixedly connected to the right side wall of the scale plate, and the buzzer is electrically connected to the microcontroller.

[0018] Compared with existing technologies, the advantages of a probe positioning device for detecting the depth of concrete cracks are:

[0019] 1. By using the fixed and distance-fixed components, when determining the placement position of the probe around the concrete crack, the two probes and the crack segment to be measured can be placed perpendicularly, allowing the probes to accurately acquire the depth data of the crack and ensuring the measurement accuracy of the ultrasonic probe.

[0020] 2. By using a set scale plate, inflation groove, inflation airbag, inflation tube, one-way valve, deflation tube, cap, support groove, and rubber tube, the positioning device can fit the curved concrete building surface when detecting cracks, thus solving the interference of curved concrete shape on the detection accuracy, stability, and integrity.

[0021] 3. With the set detection components, after the two ultrasonic probes have finished working, the ultrasonic probes can be stored away, and the wear degree of the ultrasonic probes can be detected, thereby ensuring the working quality of the ultrasonic probes. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a probe positioning device for detecting the depth of concrete cracks provided by the present invention;

[0023] Figure 2 This is a partial front view of a probe positioning device for detecting the depth of concrete cracks provided by the present invention;

[0024] Figure 3 This is a schematic diagram of the fixing method of the first wedge plate in a probe positioning device for detecting the depth of concrete cracks provided by the present invention;

[0025] Figure 4 This is a schematic diagram of the connection method of the second wedge plate in a probe positioning device for detecting the depth of concrete cracks provided by the present invention.

[0026] Figure 5 This is a schematic diagram of the internal structure of the fixing cylinder in a probe positioning device for detecting the depth of concrete cracks provided by the present invention;

[0027] Figure 6 This is a schematic diagram of the internal structure of the limiting sleeve in a probe positioning device for detecting the depth of concrete cracks provided by the present invention.

[0028] Figure 7 This is a schematic diagram of the surface structure of the clamping ring in a probe positioning device for detecting the depth of concrete cracks provided by the present invention;

[0029] Figure 8 This is a schematic diagram of the detection component in a probe positioning device for detecting the depth of concrete cracks provided by the present invention;

[0030] Figure 9 This is a partial rear view of the scale plate in a probe positioning device for detecting the depth of concrete cracks provided by the present invention.

[0031] In the diagram: 1. Scale plate, 2. Inflation groove, 3. Inflation airbag, 4. Inflation tube, 5. One-way valve, 6. Deflator tube, 7. Cap, 8. Support groove, 9. Rubber tube, 10. Distance assembly, 101. Distance post, 102. Limiting post, 11. Limiting sleeve, 12. Support plate, 13. Clamping ring, 14. Clamping pin, 15. Clamping plate, 16. Pull plate, 17. Fixing assembly, 171. Fixing plate, 172. Fixing frame, 18. First wedge plate, 19. Fixing bolt, 20. Square plate, 21. Fixing post, 22. Adjusting ring, 23. Positioning bolt, 24. Adjusting pin, 25. Mounting ring, 26. Fixing cylinder, 27. Vertical rod, 28. Second wedge plate, 29. Lifting ring, 30. Detection assembly, 301. Detection plate, 302. Insert ring, 31. Crack detection, 32. Friction ring, 33. Laser generator, 34. Laser receiver, 35. Locking pin, 36. Horizontal plate, 37. Microcontroller, 38. Buzzer. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] like Figures 1-9 As shown, a probe positioning device for detecting the depth of concrete cracks includes a scale plate 1 made of flexible rubber. An inflation groove 2 is formed on the rear side wall of the scale plate 1. An inflation airbag 3 is fixedly connected to the inner wall of the inflation groove 2. An inflation tube 4 is fixedly connected to one side wall of the inflation airbag 3. The end of the inflation tube 4 away from the inflation airbag 3 extends out of the scale plate 1 and has a one-way valve 5 inside. A deflation tube 6 is fixedly connected to the side wall of the inflation airbag 3 away from the inflation tube 4. The end of the deflation tube 6 away from the inflation airbag 3 extends out of the scale plate 1 and is threadedly connected to a cap 7. A support groove 8 is formed on the rear side wall of the scale plate 1 above the inflation groove 2. A rubber tube 9 is fixedly connected to the inner wall of the support groove 8. The rubber tube 9 is filled with electrorheological fluid. The device also includes:

[0034] The distance-fixing assembly 10, disposed on the front sidewall of the scale plate 1, is used to determine the placement position of the two ultrasonic probes. The distance-fixing assembly 10 includes multiple distance-fixing posts 101 fixedly connected to the front sidewall of the scale plate 1. A limiting post 102 is fixedly connected to the end of the distance-fixing post 101 away from the scale plate 1. Two limiting sleeves 11 that match the limiting posts 102 are placed on the front sidewall of the scale plate 1. A support plate 12 is fixedly connected to the front sidewall of the limiting sleeve 11. A clamping ring 13 is fixedly connected to the lower end of the support plate 12. A through hole is opened on the lower sidewall of the clamping ring 13, and a clamping pin 14 is movably inserted into the through hole. The upper end of the clamping pin 14 is located inside the clamping ring 13 and is fixedly connected to the clamping plate 15. The lower end of the clamping pin 14 passes through the clamping ring 13 and is fixedly connected to the pull plate 16. The pull plate 16 and the clamping ring 13 are fixedly connected to the same spring. The lower side wall of the limiting sleeve 11 is provided with a locking hole, and a locking pin 35 is inserted into the locking hole. The side wall of the limiting post 102 is provided with a locking groove that matches the locking pin 35. The lower end of the locking pin 35 is fixedly connected to the horizontal plate 36. The horizontal plate 36 and the limiting sleeve 11 are fixedly connected to the same spring, which can help the operator determine the placement position of the ultrasonic probe.

[0035] The fixing component 17 is disposed on the side wall of the scale plate 1 and is used to fix the position of the scale plate 1;

[0036] The detection assembly 30 is located on the right side of the front sidewall of the scale plate 1 and is used to detect the wear degree of the two probes. The detection assembly 30 includes a detection plate 301 fixedly connected to the front sidewall of the scale plate 1. Two insert rings 302 are fixedly connected to the front sidewall of the detection plate 301. A detection crack 31 is opened in the middle of the detection plate 301. The two insert rings 302 are symmetrically arranged about the detection crack 31. A friction ring 32 is fixedly connected to the inner wall of the insert rings 302, which can detect the working performance of the ultrasonic probe.

[0037] The fixing assembly 17 includes a fixing plate 171 fixedly connected to the front sidewall of the scale plate 1. A fixing frame 172 is fixedly connected to the lower end of the fixing plate 171. A first wedge plate 18 is inserted into the fixing frame 172. A threaded opening is provided at the lower end of the fixing frame 172, and a fixing bolt 19 is threaded into the threaded opening. The first wedge plate 18 is fixed in the fixing frame 172 by the fixing bolt 19. A square plate 20 is fixedly connected to the upper sidewall of the scale plate 1. A fixing post 21 is fixedly connected to the front sidewall of the square plate 20. An adjusting ring 22 is rotatably connected to the outer wall of the fixing post 21 through a bearing. A positioning device is threadedly connected to the sidewall of the adjusting ring 22. Bolt 23 and adjusting ring 22 are fixedly connected to the side wall of adjusting pin 24. The end of adjusting pin 24 away from adjusting ring 22 is fixedly connected to mounting ring 25. The inner wall of mounting ring 25 is rotatably connected to fixed cylinder 26 through bearing. The upper and lower side walls of fixed cylinder 26 are provided with openings, and the same vertical rod 27 is movably inserted into the two openings. The lower end of vertical rod 27 extends out of fixed cylinder 26 and is fixedly connected to second wedge plate 28. The rod wall of vertical rod 27 located in fixed cylinder 26 is fixedly sleeved with lifting ring 29. The same spring is fixedly connected between lifting ring 29 and fixed cylinder 26, which can fix the position of scale plate 1.

[0038] A laser generator 33 and a laser receiver 34 are fixedly connected to the upper side wall of the scale plate 1. The laser generator 33 and the laser receiver 34 are symmetrically arranged about the fixed plate 171, which can help the operator judge the bending state of the scale plate 1. A microcontroller 37 is fixedly connected to the right side wall of the scale plate 1. The laser receiver 34 and the microcontroller 37 are electrically connected. A buzzer 38 is fixedly connected to the right side wall of the scale plate 1. The buzzer 38 and the microcontroller 37 are electrically connected. When air is inflated into the airbag 3 through the inflation tube 4, the airbag 3 will drive the scale plate 1 to return to a flat state. When the scale plate 1 returns to a flat state, the laser signal emitted by the laser generator 33 will be received by the laser receiver 34. The laser receiver 34 will then control the buzzer 38 to emit a prompt sound through the microcontroller 37 to remind the operator that the scale plate 1 has returned to a flat state. The operator can then stop inflating the airbag 3.

[0039] The operating principle of this invention is explained as follows: When the operator inspects the crack, a first wedge plate 18 of appropriate size (there are multiple first wedge plates 18) is selected according to the length of the straight section of the crack 31 to be inspected. Then, the first wedge plate 18 is inserted into the crack to be inspected and struck with a hard object. Next, the fixing frame 172 is fitted onto the outside of the first wedge plate 18, and the upper end of the first wedge plate 18 is inserted into the groove formed by the two limiting blocks on the inner wall of the fixing frame 172 (see reference). Figure 2 and Figure 3Then rotate the fixing bolt 19 to fix the first wedge plate 18. At this time, the first wedge plate 18 and the fixing plate 171 are on the same straight line, and the fixing plate 171 and the scale plate 1 are perpendicular to each other, so that the first wedge plate 18 and the scale plate 1 are perpendicular to each other, and the first wedge plate 18 is inserted into the crack to be measured, so that the scale plate 1 and the crack to be measured are perpendicular to each other.

[0040] Next, the operator can manually rotate the adjusting pin 24 and the fixing cylinder 26 to move the second wedge plate 28 to another section of the crack, allowing the second wedge plate 28 to insert into the crack. Then, the operator can use a hard object to strike the vertical rod 27. The impact force of the strike will be transmitted through the vertical rod 27 to the second wedge plate 28, causing the second wedge plate 28 to insert into another section of the crack. The vertical rod 27 applies pressure to the fixing cylinder 26 through the spring below the lifting ring 29, causing the fixing cylinder 26 to transmit pressure to the scale plate 1 through the adjusting pin 24, adjusting ring 22, fixing column 21, and square plate 20, gradually causing the scale plate 1 to conform to the concrete structure. Once the operator sees the scale plate 1 conforming to the structure, they can stop striking the vertical rod 27. Then, the fixing column 21 and adjusting ring 22 are fixed with positioning bolts 23, and the mounting ring 25 and fixing cylinder 26 are relatively fixed with bolts (see reference). Figure 2 (The bolts that fix the mounting ring 25 and the fixing cylinder 26 have been drawn), thereby fixing the scale plate 1 to the outside of the gap. Then, the operator can rotate and open the cap 7 to release the gas inside the inflatable airbag 3. Then, manually bend the scale plate 1. Since the scale plate 1 is made of flexible rubber, it can be bent at will, so that the scale plate 1 fits the surface of the curved concrete building. Then, connect the wires on both sides of the rubber tube 9 to the external power supply. Under the action of the electric field, the electrorheological fluid in the rubber tube 9 will exhibit a viscoelastic state similar to a solid, thereby keeping the scale plate 1 in the corresponding fit.

[0041] Next, the operator loosens the fixing bolt 19 to remove the first wedge plate 18 from the fixing frame 172, and pulls the pull plate 16. The pull plate 16 drives the clamping plate 15 to move downward through the clamping pin 14. Then, the ultrasonic probe is inserted into the clamping ring 13, and the pull plate 16 is released. Under the action of the spring tension, the pull plate 16 drives the clamping plate 15 through the clamping pin 14 to clamp and fix the ultrasonic probe. The other ultrasonic probe is installed in the same way. Then, the two limiting sleeves 11 are placed on the limiting post 102 at the corresponding position (the scale plate 1 has a scale on its surface to assist the operator in placing the ultrasonic probe). The two ultrasonic probes can then be installed at the corresponding position of the crack, so that the crack can be detected by the two ultrasonic probes.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 kind of probe positioning device for concrete crack depth detection, including scale board (1), the scale board (1) is made of flexible rubber material, the rear wall of the scale board (1) is equipped with inflation groove (2), the inner wall of the inflation groove (2) is fixedly connected with inflation air bag (3), the side wall of inflation air bag (3) side is fixedly connected with inflation tube (4), the end of inflation tube (4) away from inflation air bag (3) extends out of scale board (1), and inside is equipped with check valve (5), the side wall of inflation air bag (3) side away from inflation tube (4) is fixedly connected with deflation tube (6), the end of deflation tube (6) away from inflation air bag (3) extends out of scale board (1), and is threadedly connected with cap (7), the rear wall of the scale board (1) is equipped with support groove (8) above inflation groove (2), the inner wall of the support groove (8) is fixedly connected with rubber tube (9), the rubber tube (9) is filled with electrorheological fluid, it is characterized by, Also include: Distance component (10) is arranged in the front side wall of the scale board (1), for determining the placement position of two ultrasonic probes; Fixed component (17) is arranged in the side wall of the scale board (1), for fixing the position of the scale board (1); Detection component (30) is arranged in the right side of the front side wall of the scale board (1), for detecting the wear degree of two probes, the distance component (10) includes a plurality of distance columns (101) fixedly connected to the front side wall of the scale board (1), the end of the distance column (101) away from the scale board (1) is fixedly connected with a limiting column (102), the front side wall of the scale board (1) is placed with two limiting sleeves (11) matched with the limiting column (102), the front side wall of the limiting sleeve (11) is fixedly connected with a support plate (12), the lower end of the support plate (12) is fixedly connected with a clamping ring (13), the lower side wall of the clamping ring (13) is provided with a through hole, and the clamping pin (14) is movably inserted into the through hole, the upper end of the clamping pin (14) is located in the clamping ring (13), and the clamping plate (15) is fixedly connected, the lower end of the clamping pin (14) passes through the clamping ring (13), and the pull plate (16) is fixedly connected, the same spring is fixedly connected between the pull plate (16) and the clamping ring (13), the fixed component (17) includes a fixed plate (171) fixedly connected to the front side wall of the scale board (1), the lower end of the fixed plate (171) is fixedly connected with a fixed frame (172), the first wedge plate (18) is inserted into the fixed frame (172), the lower end of the fixed frame (172) is provided with a threaded hole, and the fixed bolt (19) is threadedly connected in the threaded hole, the first wedge plate (18) is fixed in the fixed frame (172) by the fixed bolt (19), the upper side wall of the scale board (1) is fixedly connected with a square plate (20), the front side wall of the square plate (20) is fixedly connected with a fixed column (21), the outer wall of the fixed column (21) is rotatably connected with an adjusting ring (22) through a bearing, the side wall of the adjusting ring (22) is threadedly connected with a positioning bolt (23), the side wall of the adjusting ring (22) is fixedly connected with an adjusting pin (24), the end of the adjusting pin (24) away from the adjusting ring (22) is fixedly connected with a mounting ring (25), the inner wall of the mounting ring (25) is rotatably connected with a fixed cylinder (26) through a bearing, the upper and lower side walls of the fixed cylinder (26) are provided with through holes, and the same vertical rod (27) is movably inserted into the two through holes, the lower end of the vertical rod (27) extends out of the fixed cylinder (26) and is fixedly connected with a second wedge plate (28), the rod wall of the vertical rod (27) in the fixed cylinder (26) is fixedly sleeved with a lifting ring (29), and the same spring is fixedly connected between the lifting ring (29) and the fixed cylinder (26).

2. The probe positioning device for detecting a depth of a crack in concrete according to claim 1, wherein The detection assembly (30) comprises a detection plate (301) fixedly connected to the front side wall of the scale plate (1), the front side wall of the detection plate (301) is fixedly connected with two insertion rings (302), a detection crack (31) is arranged at the middle position of the detection plate (301), and the two insertion rings (302) are symmetrically arranged about the detection crack (31); and the inner wall of the insertion ring (302) is fixedly connected with a friction ring (32).

3. The probe positioning device for concrete crack depth detection according to claim 1, wherein The upper side wall of the scale plate (1) is fixedly connected with a laser generator (33) and a laser receiver (34), and the laser generator (33) and the laser receiver (34) are symmetrically arranged about the fixed plate (171).

4. The probe positioning device for concrete crack depth detection according to claim 1, characterized in that, The lower side wall of the limiting sleeve (11) is provided with a locking hole, and a locking pin (35) is inserted into the locking hole; the side wall of the limiting column (102) is provided with a locking groove matched with the locking pin (35); the lower end of the locking pin (35) is fixedly connected with a horizontal plate (36); and the horizontal plate (36) and the limiting sleeve (11) are fixedly connected with the same spring.

5. The probe positioning device for detecting a depth of a crack in concrete according to claim 3, wherein The right side wall of the scale plate (1) is fixedly connected with a microcontroller (37), and the laser receiver (34) and the microcontroller (37) are electrically connected.

6. The probe positioning device for concrete crack depth detection according to claim 5, wherein The right side wall of the scale plate (1) is fixedly connected with a buzzer (38), and the buzzer (38) and the microcontroller (37) are electrically connected.

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