Municipal bridge crack laser measuring device

Abstract

The invention provides a municipal bridge crack laser measuring device, which is mainly applied to the technical field of length measurement, and is characterized in that a magnetic conductive plate is arranged below an air bag, the air bag is inflated and expanded, so that the magnetic conductive plate is tightly attached to a bent road surface of a bridge, and a magnet is connected to a rotatable disc in a matched manner; the laser range finder is connected to the rotatable disc, the laser range finder and the magnet are arranged on the same plane, and in the process that the laser range finder and the magnet move along the electromagnetic guide rail, by means of magnetic attraction of the magnet and the magnetic conductive plate, the magnet and the magnetic conductive plate are always kept in a vertical state; and then the laser range finder is driven to always keep a state of being perpendicular to the bent road surface of the bridge in the moving process, so that laser beams emitted from the laser range finder cannot be influenced by bending of the road surface of the bridge, and the accuracy of the device for measuring municipal bridge crack length data is improved to a certain extent.

Description

Technical Field

[0001] The present application relates to the technical field of length measurement, and in particular to a laser measuring device for cracks in a municipal bridge. Background Art

[0002] In municipal bridge maintenance projects, accurately measuring parameters such as the width, depth and length of bridge cracks is of vital importance to evaluating the safety and stability of bridges. In the existing technology, when detecting the length of cracks in bridge pavements, laser measuring devices have the advantages of high precision and no damage, and are widely used in bridge crack detection operations.

[0003] In order to ensure smooth drainage of the pavement of existing bridges, the pavement of the bridge is usually a curved structure with a high middle and low sides. When using the existing laser measuring device to measure the length data of cracks on the bridge pavement, the laser rangefinder on the measuring device moves along the direction of the crack extension, and the emission direction of the laser beam is fixed. This results in the laser beam being unable to always remain perpendicular to the curved bridge pavement during the actual measurement process. This situation in which the laser beam is not perpendicular to the pavement will introduce measurement errors and seriously affect the accuracy of the measurement.

[0004] Therefore, developing a laser measuring device that can ensure that the laser beam always remains perpendicular to the bridge pavement on the curved pavement of the bridge has important practical significance for improving the accuracy and reliability of municipal bridge crack measurement, and is one of the key issues that need to be urgently solved in the current field of bridge detection technology. Summary of the invention

[0005] The purpose of the present application is to solve the problem in the prior art that when detecting cracks in municipal bridges, the laser beam cannot always remain perpendicular to the curved bridge pavement during movement, resulting in the measurement accuracy being affected. Compared with the prior art, a municipal bridge crack laser measuring device is provided, comprising a base, a box body is fixedly installed in the base, and an airbag is placed in the box body, a magnetic plate is installed at the bottom of the box body, and one end of the magnetic plate is rotatably connected to the box body, and the other end of the magnetic plate is slidably connected to the box body, an electromagnetic guide rail arranged parallel to the magnetic plate is fixedly installed on the top of the base, and a sliding end of the electromagnetic guide rail is fixed A vertical frame is installed, a first slide is installed on the vertical frame, and a ring sleeve is installed on the first slide, a disc is rotatably installed in the ring sleeve, and a horizontally arranged vertical frame is fixedly installed on the central axis of the disc, the vertical frame is vertically arranged to the electromagnetic guide rail, a second slide is installed on the vertical frame, and a vertically downward laser rangefinder is fixedly installed on the bottom of the second slide, a through groove is opened on the top of the base and is located directly above one side of the magnetic conductive plate, a square tube is fixedly installed on the disc, and an edge rod is inserted in the square tube, a magnet vertically inserted in the through groove is fixedly installed on the bottom end of the edge rod, and the laser rangefinder and the magnet are located on the same plane.

[0006] Furthermore, a square glass block located at the bottom of the laser rangefinder is rotatably mounted on the second slide, and a first servo motor for driving the square glass block to rotate is fixedly mounted on the second slide.

[0007] Furthermore, the prism rod is slidably inserted in the square tube, and a first bolt is screwed on the end wall of the square tube, and the first bolt vertically points to the outer end wall of the prism rod.

[0008] Furthermore, a first screw rod parallel to the vertical frame is rotatably installed in the vertical frame, and the first screw rod is threadedly connected to the first slide, the first slide is slidably connected to the vertical frame, and a second servo motor for driving the first screw rod to rotate is fixedly installed at the top of the vertical frame.

[0009] Furthermore, a second screw rod is rotatably installed in the longitudinal frame and arranged parallel to the second screw rod, and the second screw rod is threadedly connected to the second slide, the second slide is slidably connected to the longitudinal frame, and a third servo motor for driving the second screw rod to rotate is fixedly installed at the end position of the longitudinal frame.

[0010] Furthermore, a hinge is fixedly connected between the sliding end of the electromagnetic guide rail and the bottom end of the vertical frame, the vertical frame is hinged to the sliding end of the electromagnetic guide rail through the hinge, and a second bolt is threadedly screwed between the bottom end of the vertical frame and the sliding end of the electromagnetic guide rail.

[0011] Furthermore, a worm wheel is rotatably connected to the first slide, and the worm wheel is fixedly connected to the ring sleeve, and a worm screw meshing with the worm wheel is rotatably installed on the first slide.

[0012] Furthermore, one end of the edge rod away from the magnet is set as a straight structure, and a buckle adapted to the edge rod is fixedly installed on the top of the base.

[0013] Furthermore, evenly distributed wheels are rotatably mounted at the four corners of the bottom of the base.

[0014] Furthermore, vertically arranged guide rods are fixedly installed at the four corners of the base, and a lifting platform is slidably connected to the guide rods. Four wheels are rotatably installed on the four lifting platforms respectively. Screw sleeves are rotatably installed at the four corners of the base, and a third screw rod arranged parallel to the guide rod is screwed to the inner thread of the screw sleeve. The third screw is fixedly connected to the lifting platform. A transmission belt is commonly connected to the outer sides of the four screw sleeves. A crank is rotatably installed on the top of the base, and the crank is coaxially fixedly connected to the top of one of the screw sleeves.

[0015] Compared with the prior art, the advantages of this application are:

[0016] (1) The present application arranges a magnetic plate below the airbag and inflates the airbag so that the magnetic plate fits tightly on the curved road surface of the bridge. The magnet is connected to a rotatable disk, the laser rangefinder is connected to the rotatable disk, and the laser rangefinder and the magnet are arranged on the same plane. When the laser rangefinder and the magnet move along the electromagnetic guide rail, the magnet is always kept perpendicular to the magnetic plate by virtue of the magnetic attraction between the magnet and the magnetic plate, thereby driving the laser rangefinder to always keep perpendicular to the curved road surface of the bridge during the movement, so that the laser beam emitted from the laser rangefinder will not be affected by the curvature of the bridge road surface, thereby improving the accuracy of the device in measuring the length data of municipal bridge cracks to a certain extent.

[0017] (2) By arranging a rotatable square glass block below the laser rangefinder, the laser beam is refracted and changes its position when passing through the square glass block, and the square glass block is driven to rotate by the first servo motor, so that the range of the laser rangefinder to measure the cracks in the bridge pavement can be adjusted in a small range without changing the position of the laser rangefinder, which is conducive to improving the flexibility of the device in actual use. At the same time, the second screw is driven to rotate by the third servo motor, and the second slide is driven to move along the front and rear direction of the longitudinal frame by means of the threaded connection between the second screw and the second slide, so that the longitudinal position of the laser rangefinder can be greatly changed, which is convenient for the staff to quickly adjust the laser rangefinder to the crack on the bridge pavement according to the extension direction of the crack while the laser rangefinder moves along the electromagnetic guide rail, which is conducive to improving the operational flexibility of the device in actual use.

[0018] (3) The vertical frame is hinged to the sliding end of the electromagnetic guide rail through a hinge and fixed by the threaded connection of the second bolt. The ring sleeve is installed on the first slide through the meshing between the worm wheel and the worm, and is inserted into the square tube in cooperation with the angular rod for sliding. It is screwed and fixed by the first bolt, so that the device can be folded and contracted by adjustment when not in use, which is beneficial to improving the convenience and safety of the device when it is stored. In addition, in the process of adjusting the posture of the ring sleeve, the one-way self-locking property of the meshing transmission of the worm and the worm wheel is used to make the ring sleeve automatically maintain a stable state after adjustment, which can effectively improve the flexibility and stability of the device during the adjustment process.

[0019] (4) By rotating and installing the four wheels at the four corners of the bottom of the base, it is convenient for the staff to move and adjust the position of the device during use. At the same time, the four wheels can be moved upward relative to the base through adjustment and finally stored in the base, so that the magnetic plate installed at the bottom of the base is directly attached to the bridge pavement. When moving, it can be conveniently adjusted with the help of the rolling of the wheels. When measuring, the wheels can be retracted to ensure the stability of the detection, which makes the operation more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a stereoscopic image from the left side when used in this application;

[0021] Figure 2 This is a stereoscopic image from the right side when used in this application;

[0022] Figure 3 This is a stereoscopic image from the bottom perspective when the application is unfolded for use;

[0023] Figure 4 A perspective view of the laser rangefinder and the square glass block for this application;

[0024] Figure 5 This is a three-dimensional diagram of the present application in the stowed state;

[0025] Figure 6 This is a cross-sectional view of the electromagnetic guide rail when the application is deployed and used;

[0026] Figure 7 This is a cross-sectional view of the longitudinal frame when the application is deployed for use;

[0027] Figure 8 This is a cross-sectional view of the third screw when the present application is in use;

[0028] Fig. 9 This is a cross-sectional view of the transmission belt when the present application is in use;

[0029] Fig.10 This is a cross-sectional view of the through slot when the present application is deployed and used.

[0030] Description of the numbers in the figure:

[0031] 1. Base; 101. Box body; 102. Airbag; 103. Magnetic plate; 104. Arc groove; 2. Electromagnetic guide rail; 201. Vertical frame; 202. First slide; 203. Ring sleeve; 204. Disc; 205. Vertical frame; 206. Second slide; 207. Laser rangefinder; 208. Square glass block; 209. First servo motor; 3. Through groove; 301. Square tube; 302. Edge rod; 30 3. Magnet; 304. First bolt; 305. Buckle; 4. First screw; 401. Second servo motor; 402. Second screw; 403. Third servo motor; 5. Hinge; 501. Second bolt; 502. Worm gear; 503. Worm; 6. Wheel; 601. Guide rod; 602. Lifting platform; 603. Screw sleeve; 604. Third screw; 605. Drive belt; 606. Crank handle. DETAILED DESCRIPTION

[0032] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application.

[0033] Embodiment 1:

[0034] The present invention provides a municipal bridge crack laser measurement device, please refer to Figure 1 - Fig.10 , including a base 1, a box body 101 is fixedly installed in the base 1, and an airbag 102 is placed in the box body 101, an air pump is fixedly installed in the base 1, and the air pump is connected to the airbag 102, the top of the airbag 102 is fixedly connected to the top inner end wall of the box body 101, the bottom of the box body 101 is flush with the bottom of the base 1, a magnetic conductive plate 103 is installed at the bottom of the box body 101, and one end of the magnetic conductive plate 103 is rotatably connected to the box body 101, and the other end of the magnetic conductive plate 103 is slidably connected to the box body 101, the bottom of the base 1 and the box body 101 are set as an arc groove 104, an electromagnetic guide rail 2 arranged parallel to the magnetic conductive plate 103 is fixedly installed on the top of the base 1, and a vertical frame 201 arranged vertically is fixedly installed on the sliding end of the electromagnetic guide rail 2, and the vertical frame 201 A first slide 202 is installed on the base 1, and a ring sleeve 203 is installed on the first slide 202. A disc 204 is rotatably installed in the ring sleeve 203, and a horizontally arranged vertical frame 205 is fixedly installed on the central axis of the disc 204, and the vertical frame 205 is vertically arranged with the electromagnetic guide rail 2. A second slide 206 is installed on the vertical frame 205, and a vertically downward laser rangefinder 207 is fixedly installed at the bottom of the second slide 206. A through groove 3 located just above one side of the magnetic conductive plate 103 is opened on the top of the base 1, and a square cylinder 301 is fixedly installed on the disc 204, and a prism 302 is inserted in the square cylinder 301. A magnet 303 vertically inserted in the through groove 3 is fixedly installed on the bottom end of the prism 302, and the laser rangefinder 207 and the magnet 303 are located on the same plane.

[0035] When the device is used, the staff places the device on the bridge pavement to measure the length of the crack on the bridge pavement. The device is placed around the crack to be measured on the bridge pavement and is parallel to the crack on the bridge pavement. Then the staff starts the air pump installed in the base 1 to inflate the air bag 102. With the continuous filling of airflow, the air bag 102 inflates and expands, squeezing the magnetic plate 103 from top to bottom. Since one end of the magnetic plate 103 is rotatably connected to one end of the box body 101, and the other end of the magnetic plate 103 is slidably connected to the box body 101, under the expansion support of the air bag 102, the bottom of the magnetic plate 103 is tightly fitted to the bridge pavement, and finally the magnetic plate 103 forms a curved structure adapted to the curvature of the bridge pavement. Then the staff controls the electromagnetic guide rail 2 to be powered on and started, through the movement of its sliding end, as well as the vertical frame 201 and the longitudinal frame 20 5, driving the laser rangefinder 207 fixed under the second slide 206 to move, and slowly move along the extension direction of the electromagnetic guide rail 2. During the movement of the laser rangefinder 207, the laser rangefinder 207 continuously scans the lower part, and continuously measures the distance between the lower bridge pavement and the laser rangefinder 207. When the laser rangefinder 207 scans the inside of the crack on the bridge pavement, the inside of the crack is below the bridge pavement, which makes the length data obtained by the laser rangefinder 207 scanning the inside of the gap smaller than the length data obtained by the laser rangefinder 207 scanning the bridge pavement. In conjunction with the coordinate positioning of the laser rangefinder 207 during its movement, the obtained data is uploaded to the processor installed in the base 1 for analysis and processing, and the three-dimensional model of the bridge pavement at the component is obtained. Finally, the actual length of the crack is measured on the three-dimensional model of the crack, and the measured crack length is displayed on an external display.

[0036] When the electromagnetic guide rail 2 drives the laser rangefinder 207 to move and measure along its extension direction, it will drive the magnet 303 to move synchronously. Since the disc 204 is rotatably connected to the ring sleeve 203, and the laser rangefinder 207 and the magnet 303 are structurally connected to the disc 204, the lower end of the magnet 303 is magnetically attracted to the magnetic plate 103 at the bottom of the base 1, and under the effect of magnetic attraction, the magnet 303 in continuous movement will always be in a vertical position with the upper surface of the magnetic plate 103, so that the laser beam emitted from the laser rangefinder 207 always remains vertical to the bridge pavement, and will not be affected by the curvature of the bridge pavement, which is conducive to ensuring the accuracy of the measurement data.

[0037] See also Figure 4A square glass block 208 located at the bottom of the laser rangefinder 207 is rotatably mounted on the second slide 206, and a first servo motor 209 for driving the square glass block 208 to rotate is fixedly mounted on the second slide 206. When the device is in use, the laser beam emitted downward from the laser rangefinder 207 is emitted toward one end wall of the square glass block 208, and then emitted through the other end wall symmetrically. The direction in which the laser is emitted from the square glass block 208 is parallel to the direction in which the laser is emitted from the laser rangefinder 207 into the square glass block 208. Then, the first servo motor 209 installed on the second slide 206 is powered on and started, driving the square glass block 208 fixedly connected to its drive shaft to rotate. Since the laser beam passes through the square glass block 208, it will be refracted and change its position. With the square glass block 208 being driven to rotate by the first servo motor 209, the range of the laser rangefinder 207 to measure cracks in the bridge pavement can be adjusted in a small range without changing the position of the laser rangefinder 207, which is conducive to improving the flexibility of the device in actual use.

[0038] See also Figure 1 and Fig.10 The prism 302 is slidably inserted in the square tube 301, and a first bolt 304 is threadedly screwed on the end wall of the square tube 301, and the first bolt 304 is vertically pointed to the outer end wall of the prism 302. When the device is in use, since the prism 302 is slidably inserted in the square tube 301 and fixed by the first bolt 304 threadedly screwed, this allows the staff to flexibly adjust the position of the magnet 303 according to actual needs during use, so that the magnet 303 can cooperate with the magnetic conductive plate 103 attached to the bridge pavement below, so as to better ensure that the laser rangefinder 207 always remains vertical to the bridge pavement during the movement, which is conducive to improving the device to continuously measure the distance length below with the help of the laser rangefinder 207 during the movement, so as to achieve the accuracy of measuring the length of cracks in the bridge pavement.

[0039] See also Figure 1 , Figure 2 , Figure 6 and Figure 7A first screw rod 4 arranged parallel to the vertical frame 201 is rotatably installed in the vertical frame 201, and the first screw rod 4 is threadedly screwed to the first slide 202, the first slide 202 is slidably connected to the vertical frame 201, and a second servo motor 401 for driving the first screw rod 4 to rotate is fixedly installed at the top of the vertical frame 201, a second screw rod 402 arranged parallel to the vertical frame 205 is rotatably installed in the vertical frame 205, and the second screw rod 402 is threadedly screwed to the second slide 206, the second slide 206 is slidably connected to the vertical frame 205, and a second servo motor 401 for driving the second screw rod 40 is fixedly installed at the end position of the vertical frame 205 When the device is used, the second servo motor 401 installed on the vertical frame 201 is powered on and started, driving the first screw 4 fixedly connected to its driving shaft to rotate. With the help of the threaded engagement between the first screw 4 and the first slide 202, the up and down movement direction of the first slide 202 can be controlled by controlling the rotation direction of the second servo motor 401, so as to flexibly adjust the initial position height of the laser rangefinder 207 during the detection process, which is conducive to improving the flexibility of the device in actual use and facilitating flexible response to various different situations.

[0040] When the laser rangefinder 207 is used to measure the distance below, in addition to changing the irradiation position of the laser beam by rotating the square glass block 208 to increase the laser rangefinder 207's measurement of small-scale cracks on the bridge pavement, the third servo motor 403 can also be used to drive the second screw 402 to rotate, greatly changing the longitudinal position of the laser rangefinder 207, and realizing rapid detection of large-span cracks during the movement of the laser rangefinder 207. During this process, the third servo motor 403 is powered on and started, driving the second screw 402 fixedly connected to its drive shaft to rotate, and using the second servo motor 403 to drive the second screw 402 fixedly connected to its drive shaft to rotate. The threaded connection between the screw rod 402 and the second slide 206 drives the second slide 206 to move in the front-to-back direction of the longitudinal frame 205. By controlling the rotation direction of the driving shaft of the third servo motor 403, the front-to-back movement direction of the laser rangefinder 207 can be adjusted, and the position of the laser rangefinder 207 can be quickly adjusted in the longitudinal direction, which is convenient for the staff to quickly adjust the laser rangefinder 207 to the cracks in the bridge pavement according to the extension direction of the cracks while the laser rangefinder 207 moves along the electromagnetic guide rail 2, which is beneficial to improving the operational flexibility of the device during actual use.

[0041] See also Figure 6A hinge 5 is fixedly connected between the sliding end of the electromagnetic guide rail 2 and the bottom end of the vertical frame 201, and the vertical frame 201 is hinged to the sliding end of the electromagnetic guide rail 2 through the hinge 5. A second bolt 501 is threadedly screwed between the bottom end of the vertical frame 201 and the sliding end of the electromagnetic guide rail 2. A worm gear 502 is rotatably connected to the first slide 202, and the worm gear 502 is fixedly connected to the ring sleeve 203. A worm 503 meshing with the worm gear 502 is rotatably installed on the first slide 202, and one end of the edge rod 302 away from the magnet 303 is set to a straight structure, and a buckle 305 adapted to the edge rod 302 is fixedly installed on the top of the base 1.

[0042] When the device is in use, the vertical frame 201 and the sliding end on the electromagnetic guide rail 2 are firmly connected by the second bolt 501. By rotating the second bolt 501, the firm connection between the vertical frame 201 and the sliding end of the electromagnetic guide rail 2 can be released. At this time, with the help of the hinge 5, the vertical frame 201 can be rotated and laid down on the sliding end of the electromagnetic guide rail 2. When the vertical frame 201 is laid down, the staff holds the worm 503 and rotates it. With the help of the teeth meshing between the worm 503 and the worm wheel 502, the worm wheel 502 can be driven to drive the ring sleeve 203 to rotate, and the vertical frame 205 is swung to a state parallel to the vertical frame 201. When the vertical frame 201 is rotated, the staff can rotate the worm 503 and the worm wheel 502. When lying flat on the top of the base 1, the staff can rotate to release the lock of the first bolt 304 on the edge rod 302, and can pull the edge rod 302 out of the square tube 301 and engage it in the buckle 305 to achieve folding and storage of the device. The above-mentioned structural arrangement allows the device to be folded and contracted by adjustment when not in use, which is beneficial to improving the convenience and safety of the device when it is stored. In the process of adjusting the posture of the ring sleeve 203, the one-way self-locking property of the meshing transmission of the worm 503 and the worm wheel 502 is used, so that the ring sleeve 203 automatically maintains a stable state after adjustment, which can effectively improve the flexibility and stability of the device during the adjustment process.

[0043] See also Figure 7 - Fig. 9 The four corners of the bottom of the base 1 are rotatably installed with evenly distributed wheels 6, the four corners of the base 1 are fixedly installed with vertically arranged guide rods 601, and a lifting platform 602 is slidably connected to the guide rods 601, and the four wheels 6 are rotatably installed on the four lifting platforms 602 respectively, and the four corners of the base 1 are rotatably installed with screw sleeves 603, and the inner thread of the screw sleeve 603 is screwed with a third screw rod 604 arranged parallel to the guide rod 601, the third screw rod 604 is fixedly connected to the lifting platform 602, and the outer sides of the four screw sleeves 603 are jointly driven by a transmission belt 605, and a crank handle 606 is rotatably installed on the top of the base 1, and the crank handle 606 is coaxially fixedly connected to the top of one of the screw sleeves 603.

[0044] When the device is in use, the four wheels 6 are rotatably installed at the four corners of the bottom of the base 1, which makes it convenient for the staff to move and adjust the position of the device during use, and the four wheels 6 can be moved upward relative to the base 1 through adjustment, and finally stored in the base 1, so that the magnetic plate 103 installed at the bottom of the base 1 is directly attached to the bridge pavement, and convenient adjustment can be made with the help of the rolling of the wheels 6 during movement. When measuring, the wheels 6 are retracted to ensure the stability of detection, and the operation is flexible and convenient.

[0045] When adjusting the wheel 6, the staff can hold the crank handle 606 and rotate it. The rotation of the crank handle 606 drives one of the screw sleeves 603 to rotate. Under the transmission connection of the transmission belt 605, the four screw sleeves 603 are driven to rotate together. Then, with the help of the threaded connection between the screw sleeve 603 and the third screw rod 604, the third screw rod 604 is driven to move up and down from the screw sleeve 603, thereby adjusting the up and down movement of the wheel 6 rotatably installed on the lifting platform 602, which can effectively improve the operating convenience of the staff when using the device.

[0046] The above are only the best implementation methods adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. A municipal bridge crack laser measuring device, comprising a base (1), characterized in that: A box body (101) is fixedly installed in the base (1), and an air bag (102) is placed in the box body (101); a magnetic conductive plate (103) is installed at the bottom of the box body (101), and one end of the magnetic conductive plate (103) is rotatably connected to the box body (101), and the other end of the magnetic conductive plate (103) is slidably connected to the box body (101); an electromagnetic guide rail (2) arranged parallel to the magnetic conductive plate (103) is fixedly installed on the top of the base (1), and a vertical frame (201) is fixedly installed on the sliding end of the electromagnetic guide rail (2); a first slide (202) is installed on the vertical frame (201), and a ring sleeve (203) is installed on the first slide (202); a disk (204) is rotatably installed in the ring sleeve (203), A horizontally arranged longitudinal frame (205) is fixedly mounted on the central axis of the disc (204), the longitudinal frame (205) being arranged vertically with the electromagnetic guide rail (2), a second slide (206) being mounted on the longitudinal frame (205), and a vertically downward laser rangefinder (207) being fixedly mounted on the bottom of the second slide (206), a through slot (3) being located directly above one side of the magnetic conductive plate (103) being provided on the top of the base (1), a square tube (301) being fixedly mounted on the disc (204), and a prism (302) being inserted into the square tube (301), a magnet (303) being vertically inserted into the through slot (3) being fixedly mounted at the bottom end of the prism (302), and the laser rangefinder (207) and the magnet (303) being located on the same plane.

2. A municipal bridge crack laser measuring device according to claim 1, characterized in that: A square glass block (208) located at the bottom of the laser rangefinder (207) is rotatably mounted on the second slide (206), and a first servo motor (209) for driving the square glass block (208) to rotate is fixedly mounted on the second slide (206).

3. A municipal bridge crack laser measuring device according to claim 1, characterized in that: The prism (302) is slidably inserted into the square tube (301), and a first bolt (304) is threadedly screwed on the end wall of the square tube (301), and the first bolt (304) is vertically pointed to the outer end wall of the prism (302).

4. A municipal bridge crack laser measuring device according to claim 1, characterized in that: A first screw rod (4) arranged parallel to the vertical frame (201) is rotatably mounted in the vertical frame (201), and the first screw rod (4) is threadedly connected to the first slide (202). The first slide (202) is slidably connected to the vertical frame (201), and a second servo motor (401) for driving the first screw rod (4) to rotate is fixedly mounted at the top end of the vertical frame (201).

5. A municipal bridge crack laser measuring device according to claim 1, characterized in that: A second screw rod (402) arranged parallel to the longitudinal frame (205) is rotatably installed in the longitudinal frame (205), and the second screw rod (402) is threadedly connected to the second slide (206). The second slide (206) is slidably connected to the longitudinal frame (205), and a third servo motor (403) for driving the second screw rod (402) to rotate is fixedly installed at the end position of the longitudinal frame (205).

6. A municipal bridge crack laser measuring device according to claim 1, characterized in that: A hinge (5) is fixedly connected between the sliding end of the electromagnetic guide rail (2) and the bottom end of the vertical frame (201); the vertical frame (201) is hingedly connected to the sliding end of the electromagnetic guide rail (2) via the hinge (5); and a second bolt (501) is threadedly screwed between the bottom end of the vertical frame (201) and the sliding end of the electromagnetic guide rail (2).

7. A municipal bridge crack laser measuring device according to claim 6, characterized in that: A worm wheel (502) is rotatably connected to the first slide (202), and the worm wheel (502) is fixedly connected to the ring sleeve (203). A worm (503) meshing with the worm wheel (502) is rotatably mounted on the first slide (202).

8. The municipal bridge crack laser measuring device according to claim 1 is characterized in that: One end of the edge rod (302) away from the magnet (303) is arranged as a straight structure, and a buckle (305) adapted to the edge rod (302) is fixedly mounted on the top of the base (1).

9. The municipal bridge crack laser measuring device according to claim 1, characterized in that: Evenly distributed wheels (6) are rotatably mounted at the four corners of the bottom of the base (1).

10. A municipal bridge crack laser measuring device according to claim 9, characterized in that: A vertically arranged guide rod (601) is fixedly installed at the four corners of the base (1), and a lifting platform (602) is slidably connected to the guide rod (601). The four wheels (6) are rotatably installed on the four lifting platforms (602). A screw sleeve (603) is rotatably installed at the four corners of the base (1), and a third screw rod (604) arranged parallel to the guide rod (601) is screwed to the inner thread of the screw sleeve (603), and the third screw rod (604) is fixedly connected to the lifting platform (602). The outer sides of the four screw sleeves (603) are commonly connected to a transmission belt (605). A crank handle (606) is rotatably installed on the top of the base (1), and the crank handle (606) is coaxially fixedly connected to the top of one of the screw sleeves (603).

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