Bridge crack measuring device for bridge engineering

Abstract

The invention provides a bridge crack measuring device for bridge engineering, and belongs to the technical field of bridge engineering crack measurement. The bridge crack measuring device for bridge engineering comprises a vehicle body and rollers, rollers are installed on the vehicle body through the rollers, a driving motor is arranged in the vehicle body, the driving motor drives the rollers to rotate through a transmission system so as to control the rollers to rotate, and a measuring mechanism is arranged on the vehicle body. The measuring mechanism comprises a supporting rod, a sliding rod and a turning plate, and the supporting rod is fixedly installed on the top of the vehicle body. By arranging the measuring mechanism, the first camera can shoot the same crack for multiple times when shooting the crack, the problem that a certain crack cannot be shot clearly due to shaking of the vehicle body is avoided, compared with the prior art, multiple times of shooting of the same crack has a higher error-tolerant rate, and the shooting accuracy of the crack is improved. And mutual comparison can be carried out through multiple times of shooting of the same crack, so that the accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering crack measurement, and in particular to a bridge crack measurement device for bridge engineering. Background Art

[0002] Bridge engineering is a branch of civil engineering, which mainly involves the planning, design, construction, maintenance and management of bridges. In bridge engineering, crack measurement is a vital task. The appearance and development of cracks may be an important signal that the bridge structure is subjected to stress exceeding its bearing capacity. At the same time, cracks are also channels for external corrosive media to enter the interior of concrete. In bridge engineering, the presence of concrete cracks will make it easier for harmful substances such as rainwater and chloride ions to enter the interior of the concrete.

[0003] When the existing equipment is in use, a camera is installed on a mobile device, and the crack is observed and recorded while moving, so as to measure the depth of the crack. However, when moving, the mobile device is in a shaking state, so the image of a crack at a certain place may not be clear. Summary of the invention

[0004] In order to make up for the above deficiencies, the present invention provides a bridge crack measuring device for bridge engineering that overcomes the above technical problems or at least partially solves the above problems.

[0005] The present invention is achieved in that:

[0006] The present invention provides a bridge crack measuring device for bridge engineering, comprising a vehicle body and a rotating roller, wherein a roller is mounted on the vehicle body through the rotating roller, and a measuring mechanism is arranged on the vehicle body, wherein the measuring mechanism comprises:

[0007] A support rod, the support rod is fixedly mounted on the top of the vehicle body, a plurality of the support rods are provided, a rain shield is fixedly mounted on the top of the support rod, and a through cavity is opened on the vehicle body that passes through from top to bottom;

[0008] A slide rod, the slide rod is fixedly mounted on one end of the support rod, a slide plate is slidably sleeved on the surface of the slide rod, a screw rod is rotatably mounted on the bottom of the slide plate, a limit rod is fixedly mounted on the bottom of the slide plate, a lifting plate is sleeved between the screw rod and the limit rod, the lifting plate is threadedly connected to the screw rod, and a flip cavity that passes through from top to bottom is opened on the lifting plate;

[0009] A flip plate is arranged inside the flip cavity, a first camera is installed at the bottom of the flip plate, and a second camera is installed at the top of the flip plate.

[0010] In a preferred solution, a first rotating rod is rotatably mounted on the rear side of one of the support rods, and a second rotating rod is rotatably mounted on the front side of the other support rod. Turntables are fixedly mounted on opposite sides of the first and second rotating rods, and a connecting shaft is fixedly mounted between the two turntables.

[0011] In a preferred solution, a fixed block is fixedly installed on the left side of the skateboard, a connecting rod is arranged on the left side of the fixed block, one end of the connecting rod is rotatably sleeved inside the fixed block, and the other end of the connecting rod is rotatably sleeved on the surface of the connecting shaft.

[0012] In a preferred embodiment, a first slider is rotatably installed at the bottom of the screw rod, a second slider is fixedly installed at the bottom of the limit rod, a limit block is fixedly installed on the opposite side of the first slider and the second slider, a limit groove is provided on the inner wall of the vehicle body, and the limit block is slidably sleeved inside the limit groove.

[0013] In a preferred embodiment, a rotating wheel is fixedly mounted on the surface of the rotating roller and the surface of the first rotating rod, a transmission belt is provided between the rotating roller and the first rotating rod via the rotating wheel sleeve, a servo motor is fixedly mounted on the top of the sliding plate, and the output end of the servo motor is fixedly connected to the top of the screw rod.

[0014] In a preferred embodiment, a flipping mechanism is provided on the lifting plate, and the flipping mechanism includes a flipping rod, and the flipping rod is rotatably installed inside the lifting plate, and the flipping rod is fixedly sleeved inside the flipping plate. A rotating plate is fixedly installed on the left side of the flipping rod, and the rotating plate and the flipping rod are arranged on the same axis. The rotating plate is provided with a plurality of positioning holes that pass through the left and right sides.

[0015] In a preferred solution, a support block is fixedly installed on the top of the lifting plate, a driving rod is provided on the internal sliding sleeve of the support block, a driving frame is fixedly installed on the bottom of the driving rod, a driving groove running through the left and right is opened on the driving frame, a driving shaft is fixedly installed on the left side of the rotating plate, and the driving shaft is slidably sleeved inside the driving groove.

[0016] In a preferred solution, a driving plate is fixedly mounted on the top of the driving rod, a driving spring is fixedly mounted on the bottom of the driving plate, and the other end of the driving spring is fixedly connected to the top of the supporting block.

[0017] In a preferred solution, a non-return mechanism is provided on the lifting plate, and the non-return mechanism includes a ratchet, and the ratchet is fixedly installed on the right side of the flip rod, and a ratchet is rotatably installed on the right side of the lifting plate.

[0018] In a preferred solution, a check block is fixedly installed on the right side of the lifting plate, a check spring is fixedly installed on the left side of the check block, and the other end of the check spring is fixedly connected to the pawl.

[0019] The invention provides a bridge crack measuring device for bridge engineering, and its beneficial effects include:

[0020] 1. By setting up a measuring mechanism, the first camera can take multiple shots of the same crack when taking pictures of the crack, avoiding the problem that a certain crack cannot be photographed clearly due to the shaking of the vehicle body. Compared with the existing technology, multiple shots of the same crack have a higher fault tolerance rate, and multiple shots of the same crack can be compared with each other to improve accuracy.

[0021] 2. By setting a flip mechanism, when the rotating plate rotates, the flip rod is driven to rotate until the flip rod rotates 180 degrees, so that the first camera faces upward and the second camera faces downward. The width of the crack is photographed by the second camera, so that the user does not need to replace another mobile device when photographing the width of the crack. Compared with the existing technology, it saves costs and speeds up the measurement process.

[0022] 3. By setting a check mechanism, when the rotating plate returns to its original position through the rebound force of the driving spring, due to the existence of damping, the driving spring will vibrate back and forth after reaching the highest point, causing the flip rod to rotate back and forth. At this time, the pawl and the ratchet teeth on the ratchet wheel will resist each other, thereby preventing the ratchet wheel from rotating back and forth, thereby improving the stability of the flip plate after flipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall three-dimensional structure provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the overall structure when viewed from above is provided for an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the overall structure of the left side view is provided for an embodiment of the present invention;

[0027] Figure 4 A partial cross-sectional view of a vehicle body is provided for an embodiment of the present invention;

[0028] Figure 5 An exploded view of a connecting shaft and a connecting rod is provided for an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the structure of a flipping mechanism is provided for an embodiment of the present invention;

[0030] Figure 7 A structural schematic diagram of a non-return mechanism is provided for an embodiment of the present invention;

[0031] Figure 8 An exploded view of a flip bar and a lifting plate is provided for an embodiment of the present invention.

[0032] In the figure: 1, vehicle body; 2, roller; 3, roller; 401, support rod; 402, rain shield; 403, through cavity; 404, slide rod; 405, slide plate; 406, screw rod; 407, limit rod; 408, lifting plate; 409, flip cavity; 410, flip plate; 411, first camera; 412, second camera; 413, first rotating rod; 414, second rotating rod; 415, turntable; 416, connecting shaft; 417, fixed block; 418, connecting rod; 4 19. First slider; 420. Second slider; 421. Limit block; 422. Limit slot; 423. Transmission belt; 424. Servo motor; 501. Flip rod; 502. Turn plate; 503. Positioning hole; 504. Support block; 505. Drive rod; 506. Drive frame; 507. Drive slot; 508. Drive shaft; 509. Drive plate; 510. Drive spring; 601. Ratchet; 602. Ratchet; 603. Check block; 604. Check spring. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Reference Figure 1-8The present invention provides a technical solution: a bridge crack measuring device for bridge engineering, comprising a vehicle body 1 and a roller 2, a roller 3 is installed on the vehicle body 1 through the roller 2, a driving motor is arranged inside the vehicle body 1, the driving motor drives the roller 2 to rotate through a transmission system, thereby controlling the rotation of the roller 3, a measuring mechanism is arranged on the vehicle body 1, the measuring mechanism comprises a support rod 401, a slide rod 404 and a flap 410, the support rod 401 is fixedly installed on the top of the vehicle body 1, a plurality of support rods 401 are arranged, a rain shield 402 is fixedly installed on the top of the support rod 401, a through cavity 403 which passes through from top to bottom is opened on the vehicle body 1, the slide rod 404 The slide bar 404 is fixedly mounted at one end of the support rod 401, and a slide plate 405 is slidably sleeved on the surface of the slide bar 404. A screw rod 406 is rotatably mounted at the bottom of the slide plate 405. A limit rod 407 is fixedly mounted at the bottom of the slide plate 405. A lifting plate 408 is sleeved between the screw rod 406 and the limit rod 407. The lifting plate 408 and the screw rod 406 are threadedly connected. A flip cavity 409 that passes through from top to bottom is opened on the lifting plate 408. A flip plate 410 is arranged inside the flip cavity 409. A first camera 411 is installed at the bottom of the flip plate 410. The first camera 411 is a camera device specially used for photographing the depth of the crack. The top of the flip plate 410 is installed There is a second camera 412, which is a camera device specially used to shoot the width of the crack. By setting up a measuring mechanism, the user holds the handrail to control the direction of the vehicle body 1, and drives the roller 3 to rotate through the driving motor to make the vehicle body 1 move leftward along the direction of the crack. When the slide plate 405 reciprocates along the slide bar 404 in the left and right directions, the lifting plate 408 is driven to reciprocate in the left and right directions through the screw rod 406 and the limit rod 407. Since the first camera 411 is installed on the lifting plate 408, the first camera 411 reciprocates in the left and right directions, so that the first camera 411 can measure the width of the crack. When photographing a crack, the same crack can be photographed multiple times to avoid the problem that a crack at a certain location cannot be photographed clearly due to the shaking of the vehicle body 1. Compared with the prior art, multiple photographs of the same crack have a higher fault tolerance rate, and the multiple photographs of the same crack can be compared with each other to improve accuracy. When the screw rod 406 rotates, the screw rod 406 and the lifting plate 408 are threadedly connected, and the limit rod 407 and the lifting plate 408 are slidably connected, so that the lifting plate 408 can be adjusted in the vertical direction, so that the user can adjust the distance between the first camera 411 and the crack as needed;

[0035] Reference Figure 1-8A first rotating rod 413 is rotatably mounted on the rear side of one of the support rods 401, and a second rotating rod 414 is rotatably mounted on the front side of the other support rod 401. A rotating disk 415 is fixedly mounted on the opposite side of the first rotating rod 413 and the second rotating rod 414. A connecting shaft 416 is fixedly mounted between the two rotating disks 415. The connecting shaft 416 is eccentrically arranged relative to the rotating disk 415. A fixed block 417 is fixedly mounted on the left side of the slide plate 405. A connecting rod 418 is arranged on the left side of the fixing block 417. One end of the connecting rod 418 is rotatably sleeved on the fixing block 417. The other end of the connecting rod 418 is rotatably sleeved on the surface of the connecting shaft 416. By setting the rotating disk 415, when the first rotating rod 413 rotates, one of the rotating disks 415 is driven to rotate, and the other rotating disk 415 and the second rotating rod 414 are rotated at the same time through the fixed cooperation of the connecting shaft 416. Due to the eccentric setting of the connecting shaft 416, the connecting shaft 416 squeezes the connecting rod 418, and the connecting rod 418 drives the fixed block 417 and the slide plate 405 to reciprocate in the left and right directions under the limiting cooperation of the sliding rod 404;

[0036] Reference Figure 1-8 A first slider 419 is rotatably mounted at the bottom of the screw rod 406, and a second slider 420 is fixedly mounted at the bottom of the limiting rod 407. A limiting block 421 is fixedly mounted on the opposite sides of the first slider 419 and the second slider 420. A limiting groove 422 is provided on the inner wall of the vehicle body 1, and the limiting block 421 is slidably sleeved inside the limiting groove 422. By arranging the first slider 419 and the second slider 420, the height adjustment of the lifting plate 408 in the vertical direction is limited. The limiting cooperation between the first slider 419 and the second slider 420 prevents the lifting plate 408 from being separated from the screw rod 406.

[0037] Reference Figure 1-8 , the surface of the roller 2 and the surface of the first rotating rod 413 are both fixedly sleeved with a rotating wheel, a transmission belt 423 is provided between the roller 2 and the first rotating rod 413 through the rotating wheel sleeve, a servo motor 424 is fixedly installed on the top of the slide plate 405, and the output end of the servo motor 424 is fixedly connected to the top of the screw rod 406. By setting the transmission belt 423, when the driving motor drives the roller 2 to rotate through the transmission system, the first rotating rod 413 is driven to rotate through the cooperation of the rotating wheel and the transmission belt 423, providing driving force for the first rotating rod 413. The setting of the servo motor 424 allows the user to drive the screw rod 406 to rotate by starting the servo motor 424, providing driving force for the screw rod 406;

[0038] Reference Figure 1-8, a flipping mechanism is provided on the lifting plate 408, and the flipping mechanism includes a flipping rod 501, which is rotatably installed inside the lifting plate 408, and the flipping rod 501 is fixedly sleeved inside the flipping plate 410. A rotating plate 502 is fixedly installed on the left side of the flipping rod 501, and the rotating plate 502 and the flipping rod 501 are arranged on the same axis. A plurality of positioning holes 503 that pass through the left and right are opened on the rotating plate 502, that is, the center of the flipping rod 501 coincides with the center of the rotating plate 502. By setting the flipping mechanism, when the rotating plate 502 rotates, the flipping rod 501 is driven to rotate until the flipping rod 501 rotates 180 degrees, so that the first camera 411 faces upward and the second camera 412 faces downward, and the width of the crack is photographed by the second camera 412, so that the user does not need to replace another mobile device when photographing the width of the crack. Compared with the prior art, it saves costs and speeds up the measurement process;

[0039] Reference Figure 1-8 A support block 504 is fixedly installed on the top of the lifting plate 408, and a driving rod 505 is slidably sleeved inside the support block 504. A driving frame 506 is fixedly installed on the bottom of the driving rod 505. A driving groove 507 that passes through the left and right is opened on the driving frame 506. A driving shaft 508 is fixedly installed on the left side of the rotating plate 502. The driving shaft 508 is slidably sleeved inside the driving groove 507. By setting the driving frame 506, the user rotates the screw rod 406 of the driving rod 505 to move the lifting plate 408 upward. After reaching the preset position, the bottom of the slide plate 405 squeezes the driving plate 509, so that the driving rod 505 drives the driving frame 50 6 moves downward relative to the rotating plate 502, and the inner wall of the driving groove 507 squeezes the driving shaft 508, so that the driving shaft 508 drives the rotating plate 502 to rotate, and compresses the driving spring 510 at the same time. In the initial state, the driving shaft 508 is located at the highest point of the rotating plate 502. When the driving shaft 508 is squeezed by the driving frame 506 and moves to the lowest point of the rotating plate 502, the rotating plate 502 drives the flip rod 501 to rotate 180 degrees, thereby providing a driving force for the flipping of the flip rod 501. A positioning groove is provided on the left side of the lifting plate 408. At this time, the user fixes the rotating plate 502 by inserting a pin into the corresponding positioning hole 503 and the positioning groove;

[0040] Reference Figure 1-8A driving plate 509 is fixedly installed on the top of the driving rod 505, and a driving spring 510 is fixedly installed on the bottom of the driving plate 509. The other end of the driving spring 510 is fixedly connected to the top of the support block 504. By setting the driving plate 509 and the driving spring 510, when the user needs to switch back to the first camera 411, the pin rod is pulled out, and the rebound force of the driving spring 510 causes the rotating plate 502 to rotate 180 degrees again, and drives the driving shaft 508 back to its original position, so that the flip rod 501 drives the flip plate 410 back to its original position, so that the first camera 411 faces downward again;

[0041] Reference Figure 1-8 A non-return mechanism is provided on the lifting plate 408, and the non-return mechanism includes a ratchet 601, which is fixedly installed on the right side of the flip rod 501, and a pawl 602 is rotatably installed on the right side of the lifting plate 408, and a non-return block 603 is fixedly installed on the right side of the lifting plate 408, and a non-return spring 604 is fixedly installed on the left side of the non-return block 603, and the other end of the non-return spring 604 is fixedly connected to the pawl 602. By setting the non-return mechanism, when the rotating plate 502 returns to its original position through the rebound force of the driving spring 510, due to the existence of damping, the driving spring 510 will vibrate back and forth after reaching the highest point, so that the flip rod 501 rotates back and forth. At this time, the pawl 602 and the ratchet teeth on the ratchet 601 are counteracted, thereby preventing the ratchet 601 from rotating back and forth, thereby improving the stability of the flip plate 410 after flipping.

[0042] Specifically, the working process or working principle of the bridge crack measuring device for bridge engineering is as follows: when in use, the user holds the handrail to control the direction of the vehicle body 1, and drives the roller 3 to rotate through the driving motor to make the vehicle body 1 move to the left along the direction of the crack. When the driving motor drives the roller 2 to rotate through the transmission system, the first rotating rod 413 is driven to rotate through the cooperation of the rotating wheel and the transmission belt 423. When the first rotating rod 413 rotates, one of the rotating disks 415 is driven to rotate, and the other rotating disk 415 and the second rotating rod 414 are rotated at the same time through the fixed cooperation of the connecting shaft 416. Due to the eccentric setting of the connecting shaft 416, the connecting shaft 416 squeezes the connecting rod 418, and the connecting rod 418 is limited by the cooperation of the sliding rod 404. 18 drives the fixed block 417 and the slide plate 405 to reciprocate in the left and right directions, and drives the lifting plate 408 to slide back and forth in the left and right directions through the screw rod 406 and the limit rod 407. Since the first camera 411 is installed on the lifting plate 408, the first camera 411 slides back and forth in the left and right directions, so that the first camera 411 can take multiple photos of the same crack when taking photos of the crack. The user starts the servo motor 424 to drive the screw rod 406 to rotate. Through the threaded connection between the screw rod 406 and the lifting plate 408, and the sliding connection between the limit rod 407 and the lifting plate 408, the lifting plate 408 can be adjusted in the vertical direction. The user rotates the screw rod 406 by driving the driving rod 505 When the lifting plate 408 moves upward and reaches the preset position, the bottom of the slide plate 405 squeezes the driving plate 509, so that the driving rod 505 drives the driving frame 506 to move downward relative to the rotating plate 502, and the inner wall of the driving groove 507 squeezes the driving shaft 508, so that the driving shaft 508 drives the rotating plate 502 to rotate, and compresses the driving spring 510 at the same time. In the initial state, the driving shaft 508 is located at the highest point of the rotating plate 502. When the driving shaft 508 is squeezed and moved to the lowest point of the rotating plate 502 by the squeezing of the driving frame 506, the rotating plate 502 drives the flip rod 501 to rotate 180 degrees. At this time, the user fixes the rotating plate 502 by inserting the pin into the corresponding positioning hole 503 and the positioning groove, so that the first camera 411 The front side faces upward and the second camera 412 faces downward. The width of the crack is photographed through the second camera 412. When the user needs to switch back to the first camera 411, the pin is pulled out, and the rotating plate 502 is rotated one hundred and eighty degrees again through the rebound force of the driving spring 510, and the driving shaft 508 is driven back to its original position, so that the flip rod 501 drives the flip plate 410 back to its original position, so that the first camera 411 faces downward again. When the rotating plate 502 returns to its original position through the rebound force of the driving spring 510, due to the existence of damping, the driving spring 510 will vibrate back and forth after reaching the highest point, causing the flip rod 501 to rotate back and forth. At this time, the pawl 602 and the ratchet teeth on the ratchet 601 are resisted, thereby preventing the ratchet 601 from rotating back and forth.

Claims

1. A bridge crack measuring device for bridge engineering, comprising a vehicle body (1) and a rotating roller (2), wherein a roller (3) is mounted on the vehicle body (1) via the rotating roller (2), and characterized in that: The vehicle body (1) is provided with a measuring mechanism, which comprises: A support rod (401), the support rod (401) being fixedly mounted on the top of the vehicle body (1), a plurality of the support rods (401) being provided, a rain shield (402) being fixedly mounted on the top of the support rod (401), and a through cavity (403) penetrating from top to bottom being provided on the vehicle body (1); A slide bar (404), wherein the slide bar (404) is fixedly mounted on one end of the support bar (401), a slide plate (405) is slidably sleeved on the surface of the slide bar (404), a screw rod (406) is rotatably mounted on the bottom of the slide plate (405), a limit rod (407) is fixedly mounted on the bottom of the slide plate (405), a lifting plate (408) is sleeved between the screw rod (406) and the limit rod (407), the lifting plate (408) and the screw rod (406) are threadedly connected, and a turning cavity (409) which passes through from top to bottom is opened on the lifting plate (408); A flip plate (410), the flip plate (410) is arranged inside the flip cavity (409), a first camera (411) is installed at the bottom of the flip plate (410), and a second camera (412) is installed at the top of the flip plate (410).

2. A bridge crack measuring device for bridge engineering according to claim 1, characterized in that: A first rotating rod (413) is rotatably mounted on the rear side of one of the support rods (401), and a second rotating rod (414) is rotatably mounted on the front side of the other support rod (401). A rotating disk (415) is fixedly mounted on the opposite side of the first rotating rod (413) and the second rotating rod (414), and a connecting shaft (416) is fixedly mounted between the two rotating disks (415).

3. The bridge crack measuring device for bridge engineering according to claim 2, characterized in that: A fixed block (417) is fixedly installed on the left side of the slide plate (405), and a connecting rod (418) is arranged on the left side of the fixing block (417). One end of the connecting rod (418) is rotatably sleeved inside the fixing block (417), and the other end of the connecting rod (418) is rotatably sleeved on the surface of the connecting shaft (416).

4. The bridge crack measuring device for bridge engineering according to claim 3, characterized in that: A first slider (419) is rotatably mounted at the bottom of the screw rod (406), a second slider (420) is fixedly mounted at the bottom of the limiting rod (407), a limiting block (421) is fixedly mounted on opposite sides of the first slider (419) and the second slider (420), a limiting groove (422) is provided on the inner wall of the vehicle body (1), and the limiting block (421) is slidably sleeved inside the limiting groove (422).

5. The bridge crack measuring device for bridge engineering according to claim 4, characterized in that: The surfaces of the rotating roller (2) and the first rotating rod (413) are both fixedly sleeved with rotating wheels, a transmission belt (423) is provided between the rotating roller (2) and the first rotating rod (413) via the rotating wheel sleeve, a servo motor (424) is fixedly mounted on the top of the slide plate (405), and an output end of the servo motor (424) is fixedly connected to the top of the lead screw (406).

6. The bridge crack measuring device for bridge engineering according to claim 5, characterized in that: The lifting plate (408) is provided with a flipping mechanism, and the flipping mechanism comprises a flipping rod (501), the flipping rod (501) is rotatably mounted inside the lifting plate (408), the flipping rod (501) is fixedly sleeved inside the flipping plate (410), a rotating plate (502) is fixedly mounted on the left side of the flipping rod (501), the rotating plate (502) and the flipping rod (501) are arranged on the same axis, and a plurality of positioning holes (503) passing through from left to right are opened on the rotating plate (502).

7. The bridge crack measuring device for bridge engineering according to claim 6, characterized in that: A support block (504) is fixedly installed on the top of the lifting plate (408), a driving rod (505) is slidably sleeved inside the support block (504), a driving frame (506) is fixedly installed on the bottom of the driving rod (505), and a driving groove (507) running through the left and right sides is opened on the driving frame (506), and a driving shaft (508) is fixedly installed on the left side of the rotating plate (502), and the driving shaft (508) is slidably sleeved inside the driving groove (507).

8. The bridge crack measuring device for bridge engineering according to claim 7, characterized in that: A driving plate (509) is fixedly mounted on the top of the driving rod (505), a driving spring (510) is fixedly mounted on the bottom of the driving plate (509), and the other end of the driving spring (510) is fixedly connected to the top of the supporting block (504).

9. The bridge crack measuring device for bridge engineering according to claim 8, characterized in that: The lifting plate (408) is provided with a non-return mechanism, the non-return mechanism comprising a ratchet (601), the ratchet (601) is fixedly mounted on the right side of the flip rod (501), and a ratchet pawl (602) is rotatably mounted on the right side of the lifting plate (408).

10. The bridge crack measuring device for bridge engineering according to claim 9, characterized in that: A check block (603) is fixedly installed on the right side of the lifting plate (408), a check spring (604) is fixedly installed on the left side of the check block (603), and the other end of the check spring (604) is fixedly connected to the pawl (602).

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