A bridge and tunnel material detection device with a protection structure and a detection method

Abstract

The present invention discloses a bridge and tunnel material detection device with a protection structure and a detection method, including a mounting plate. On one side of the front of the mounting plate, a laser rangefinder is installed. At the bottom end of the mounting plate, a lifting sling is installed. At the lower end of the lifting sling, a connecting plate is installed. The inside of the connecting plate is hollow and a moving guide rail is installed. On both sides of the lower end of the moving guide rail, fixture top plates are provided. In the middle of the lower ends of the fixture top plates, side plates are fixedly connected. On one side of the two side plates facing each other, electric fixtures are provided. A steel pipe to be detected is installed between the two electric fixtures. On one side of the two side plates away from each other, protection mechanisms are provided. The beneficial effects achieved by the present invention include: The present invention is provided with protection mechanisms. In the lifted state, the protection mechanisms control the electric fixtures and the side plates to remain in the state of clamping the steel pipe, and the staff cannot use the control terminal to control the operation of the electric fixtures and the side plates anymore, so there is no risk of the steel pipe falling due to accidental touch.

Description

Technical Field:

[0001] The present invention belongs to the technical field of bridge material testing equipment, and particularly relates to a bridge and tunnel material testing device with a protection structure and a testing method. Background Art:

[0002] When constructing a bridge or tunnel, steel pipes are needed for erection. Before the steel pipes are put into use, it is necessary to detect their surfaces to see if there are any pits or damages to avoid potential safety hazards during subsequent construction. When detecting steel pipes currently, most of them are lifted by a crane and detected by a laser rangefinder. The distance data between the emitting end of the laser rangefinder and various parts of the steel pipe surface is detected and the data is compared. When the difference between the distance data at a certain point and the normal distance is too large, it indicates that there is a pit or damage. However, during the detection, after the steel pipe is clamped and lifted, sometimes due to misoperation, the clamping part of the steel pipe loosens, resulting in the steel pipe falling, which has a great safety hazard. To solve the above problems, a bridge and tunnel material testing device with a protection structure and a testing method are proposed. Summary of the Invention:

[0003] The purpose of the present invention is to provide a bridge and tunnel material testing device with a protection structure and a testing method to solve the above problems.

[0004] To solve the above problems, the present invention provides a technical solution:

[0005] A bridge and tunnel material testing device with a protection structure and a testing method, including a mounting plate. On one side of the front of the mounting plate, a laser rangefinder is installed to detect the distance data between its emitting end and the surface of the steel pipe. At the bottom of the mounting plate, a lifting sling is installed. At the lower end of the lifting sling, a connecting plate is installed. The lifting sling can lift the connecting pipe with the steel pipe, facilitating the movement of the steel pipe to be detected relative to the laser rangefinder. The inside of the connecting plate is hollow and is provided with a moving guide rail. On both sides of the lower end of the moving guide rail, fixture top plates are provided. In the middle of the lower ends of the fixture top plates, side plates are fixedly connected. On the opposite sides of the two side plates, electric clamps are provided. Between the two electric clamps, a steel pipe to be detected is installed. The two ends of the steel pipe to be detected are clamped by the electric clamps, so that the two ends of the steel pipe are limited within the electric clamps. Through the cooperation of the electric clamps and a pair of side plates, the position of the steel pipe can be fixed. On both sides of the two side plates away from each other, protection mechanisms are provided;

[0006] The electric clamps each include a pair of electric telescopic rods for controlling the operation of the clamps. One side of the bottom end of the clamp top plate is respectively equipped with a second switch, and the second switch is used to control the operation of the corresponding pair of electric telescopic rods. The moving guide rail includes a second motor for driving the operation of the guide rail. One side of the bottom end of the connecting plate is equipped with a first switch, and the first switch is used to control the operation of the second motor;

[0007] The protection mechanism includes a first protection plate and a second protection plate. The first protection plate and the second protection plate are respectively fixedly connected to the sides of the two side plates away from each other. The middle of the first protection plate and both sides of the second protection plate are inserted with ejector rods. The bottom ends of the ejector rods are fixedly connected with springs through connecting blocks. The upper ends of the springs are fixedly connected to the bottom ends of the corresponding first protection plate and second protection plate. In the lifted state, the protection mechanism controls the electric clamps and the side plates to remain in the state of clamping the steel pipe, and the staff can no longer use the control terminal to control the operation of the electric clamps and the side plates, and there is no risk of the steel pipe falling caused by accidental touch. In the landed state, the protection state of the protection mechanism is automatically triggered and closed on the plane, and the staff can use the control terminal to control the operation of the electric clamps and the side plates to remove the steel pipe.

[0008] Preferably, a rotating mechanism is provided on the opposite sides of the two side plates. The rotating mechanism includes two circular grooves, and the two circular grooves are respectively opened on the opposite sides of the two side plates. The tooth discs are rotatably connected to the groove walls of the circular grooves. Installation grooves are respectively opened on the lower sides of the groove walls of the circular grooves and gears are arranged in the installation grooves. Driving motors are respectively installed in the middle of the gears. Each gear is meshed with the corresponding tooth disc. A steel pipe to be detected is clamped between the two tooth discs. The steel pipe can be driven to rotate through the rotating mechanism, so that other surfaces of the steel pipe face the laser rangefinder for detection.

[0009] Preferably, a moving mechanism is installed inside the mounting plate. The moving mechanism includes a third motor. The third motor is fixedly connected to one end inside the mounting plate. The output end of the third motor is fixedly connected with a second lead screw. The end of the second lead screw away from the third motor is rotatably connected to the inner end wall of the mounting plate. A slider is threadedly connected to the surface of the second lead screw. The slider extends to the outside of the mounting plate. The laser rangefinder is fixedly connected to the bottom end of the slider. The laser rangefinder can be driven to translate through the moving mechanism, which is convenient for detecting other positions in the horizontal direction of the steel pipe.

[0010] Preferably, the lifting sling includes a first motor fixedly connected to the middle of the bottom end of the mounting plate. The first motor is a double-headed motor, and both ends of the first motor are fixedly connected with connecting rods. Both sides of the bottom end of the mounting plate are fixedly connected with side blocks, and the mutually remote ends of the two connecting rods are rotatably connected to the middle of the corresponding side blocks. The surfaces of the mutually remote sides of the two connecting rods are both wound with lifting ropes, and the lower ends of the two lifting ropes are respectively fixedly connected to both sides of the upper end of the connecting plate. The two lifting ropes can be driven to wind up by the lifting sling to lift the object.

[0011] Preferably, the second motor is fixedly connected to one end inside the connecting plate. The output end of the second motor is fixedly connected with a first lead screw. The end of the first lead screw away from the second motor is rotatably connected to the other end inside the connecting plate. The first lead screw is a bidirectional lead screw, and both sides of the first lead screw are threadedly connected with moving blocks. The lower ends of the moving blocks both penetrate through the bottom wall opening of the connecting plate and are fixedly connected to the corresponding fixture top plates. When the second motor is started, it drives the first lead screw to rotate, and the moving blocks on both sides of the first lead screw move accordingly, driving the corresponding fixture top plates to move.

[0012] Preferably, each electric fixture is formed by docking a pair of arc-shaped clamping plates. Both ends of the steel pipe to be detected are clamped between a pair of arc-shaped clamping plates. Each pair of electric telescopic rods is fixedly connected to both sides of the fixture top plate, and the output end of each electric telescopic rod is fixedly connected to the upper part of the outer side of the corresponding arc-shaped clamping plate. When the electric fixture clamps, each pair of electric telescopic rods operates, driving the corresponding pair of arc-shaped clamping plates to approach each other until they clamp on both sides of the steel pipe, and the clamping can be completed.

[0013] Preferably, the distances between the bottoms of the first switch and the second switch and the upper ends of the corresponding ejector rods are equal. When each ejector rod is squeezed by a plane, the corresponding first switch and second switch are simultaneously squeezed to be turned on.

[0014] According to the detection method of a bridge and tunnel material detection device with a protection structure described above, the following steps are included:

[0015] A1: First, clamp the steel pipe. The two side plates can be driven to approach each other relatively through the moving guide rails, so that the steel pipe is clamped between the two side plates. Then, clamp both ends of the steel pipe to be detected through the electric fixture, so that both ends of the steel pipe are limited within the electric fixture. Through the cooperation of the electric fixture and a pair of side plates, the position of the steel pipe can be fixed;

[0016] A2: The connecting pipe equipped with the steel pipe can be lifted through the lifting sling, and the steel pipe is moved to face the laser rangefinder for detection. The distance data between the emitting end of the laser rangefinder and the surface of the steel pipe is detected. When the difference between the distance data at a certain place on the surface of the steel pipe and the normal distance is too large, it indicates that there are potholes and damages;

[0017] A3: In the lifted state, the ejector rod of the protection mechanism is not squeezed by the plane, the first switch and the second switch are not squeezed, and the circuit will be closed. At this time, the staff cannot use the control terminal to control the operation of the electric fixture and the side plate, and there is no risk of the steel pipe falling due to accidental touch. In the landed state, when the ejector rod is squeezed and moved upward by the plane, it will squeeze the corresponding first switch and second switch. At this time, the first switch and the second switch are squeezed and in the open state, the circuit is connected, and the electric telescopic rod and the second motor can operate. Only then can the staff use the control terminal to control the operation of the electric fixture and the side plate and remove the steel pipe.

[0018] A4: The rotating mechanism can drive the steel pipe to rotate, so that other surfaces of the steel pipe face the laser rangefinder for detection. The moving mechanism drives the laser rangefinder to translate, which is convenient for detecting other lateral positions of the steel pipe, and the detection range is more comprehensive.

[0019] The beneficial effects of the present invention include:

[0020] The present invention is provided with a protection mechanism. In the lifted state, the protection mechanism controls the electric fixture and the side plate to remain in the state of clamping the steel pipe. The staff can no longer use the control terminal to control the operation of the electric fixture and the side plate, and there is no risk of the steel pipe falling due to accidental touch. In the landed state, the plane automatically triggers the closing of the protection state of the protection mechanism, and only then can the staff use the control terminal to control the operation of the electric fixture and the side plate and remove the steel pipe. By setting the rotating mechanism and the moving mechanism, the rotating mechanism can drive the steel pipe to rotate, so that other surfaces of the steel pipe face the laser rangefinder for detection, and the moving mechanism can drive the laser rangefinder to translate, which is convenient for detecting other lateral positions of the steel pipe. Description of the drawings:

[0021] For ease of explanation, the present invention is described in detail by the following specific embodiments and drawings.

[0022] Figure 1 Is the three-dimensional structure schematic diagram of the present invention;

[0023] Figure 2 Is the structure schematic diagram of the connection between the connecting plate and the electric fixture of the present invention;

[0024] Figure 3 Is the structure schematic diagram of the connection of the protection mechanism of the present invention;

[0025] Figure 4 Is the structure schematic diagram of the connection of the side plate of the present invention;

[0026] Figure 5 Is the split structure schematic diagram of the connection of the rotating mechanism of the present invention;

[0027] Figure 6Schematic cross-sectional structure diagram of the connection part of the fixture top plate of the present invention.

[0028] In the figure: 1, mounting plate; 2, laser rangefinder; 3, lifting sling; 31, first motor; 32, connecting rod; 33, lifting rope; 4, connecting plate; 5, moving guide rail; 51, second motor; 52, first switch; 53, first lead screw; 54, moving block; 6, fixture top plate; 7, side plate; 8, electric fixture; 81, electric telescopic rod; 82, arc-shaped clamping plate; 83, second switch; 9, protection mechanism; 91, first protection plate; 92, second protection plate; 93, ejector rod; 94, spring; 10, rotating mechanism; 101, circular groove; 102, toothed disc; 103, gear; 11, moving mechanism; 111, third motor; 112, second lead screw; 113, slider. Specific implementation manners:

[0029] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1

[0031] Please refer to Figure 1-3 , this embodiment provides a bridge and tunnel material detection device and detection method with a protection structure, including a mounting plate 1. A laser rangefinder 2 is installed on one side of the front of the mounting plate 1. The distance data between its emission end and the surface of the steel pipe is detected by the laser rangefinder 2. When the difference between the distance data at a certain point on the surface of the steel pipe and the normal distance is too large, it indicates that there are potholes and damages. A lifting sling 3 is installed at the bottom of the mounting plate 1, and a connecting plate 4 is installed at the lower end of the lifting sling 3. The connecting plate 4 equipped with the steel pipe can be lifted by the lifting sling 3, facilitating the movement of the steel pipe to be detected relative to the laser rangefinder 2. The inside of the connecting plate 4 is hollow and a moving guide rail 5 is installed. Fixture top plates 6 are arranged on both sides at the lower end of the moving guide rail 5. Side plates 7 are fixedly connected to the middle of the lower ends of the fixture top plates 6. The two side plates 7 can be driven to approach each other relatively through the moving guide rail 5, so that the steel pipe is clamped between the two side plates 7. Electric fixtures 8 are arranged on the opposite sides of the two side plates 7. The steel pipe to be detected is installed between the two electric fixtures 8, and the two ends of the steel pipe to be detected are clamped by the electric fixtures 8, so that the two ends of the steel pipe are limited within the electric fixtures 8. Through the cooperation of the electric fixtures 8 and a pair of side plates 7, the position of the steel pipe can be fixed. Only after fixing can the lifting sling 3 be used for lifting. Protection mechanisms 9 are arranged on the opposite sides of the two side plates 7 away from each other. The protection mechanisms 9 protect the fixing parts of the electric fixtures 8 and the side plates 7 to prevent them from moving due to misoperation during lifting, resulting in the falling of the steel pipe.

[0032] The electric fixture 8 includes a pair of electric telescopic rods 81 that control the operation of the fixture. On one side of the bottom end of the fixture top plate 6, a second switch 83 is installed. The second switch 83 is used to control the operation of the corresponding pair of electric telescopic rods 81. The staff controls the operation of the pair of electric telescopic rods 81 through the control terminal, which can drive the electric fixture 8 to open and close. The moving guide rail 5 includes a second motor 51 that drives the operation of the guide rail. On one side of the bottom end of the connecting plate 4, a first switch 52 is installed. The first switch 52 is used to control the operation of the second motor 51. The staff controls the operation of the second motor 51 through the control terminal, which can drive the moving guide rail 5 to operate, so as to move relative to the pair of side plates 7 for clamping or releasing the clamping.

[0033] In the lifted state, sometimes due to the misoperation of the staff on the control terminal, the electric fixture 8 may be opened or the pair of side plates 7 may move away from each other to stop clamping. Therefore, a protection mechanism 9 is provided for protection. The protection mechanism 9 includes a first protection plate 91 and a second protection plate 92. The first protection plate 91 and the second protection plate 92 are respectively fixedly connected to the sides of the two side plates 7 that are away from each other. A push rod 93 is inserted in the middle of the first protection plate 91 and on both sides of the second protection plate 92. The bottom ends of the push rods 93 are fixedly connected with springs 94 through connecting blocks. The upper ends of the springs 94 are fixedly connected to the bottom ends of the corresponding first protection plate 91 and second protection plate 92. The distances between the bottom ends of the first switch 52 and the second switch 83 and the upper ends of the corresponding push rods 93 are equal. When the steel pipe is detected and the lifting sling 3 drives the steel pipe to gradually descend and approach the bottom plane, the bottom plane will squeeze each push rod 93, causing the corresponding spring 94. Then, as the push rod 93 moves upward, it will squeeze the corresponding first switch 52 and second switch 83. At this time, the first switch 52 and the second switch 83 are squeezed and in the open state, the circuit is connected, and the electric telescopic rod 81 and the second motor 51 can operate. At this time, the staff can use the control terminal to open the electric telescopic rod 81 and the second motor 51, so that the electric fixture 8 is opened, and the steel pipe is no longer clamped by the electric fixture 8. At the same time, the pair of side plates 7 move away from each other under the drive of the moving guide rail 5, and the steel pipe is no longer clamped by the pair of side plates 7, and the steel pipe will be released and fall on the plane. When it is necessary to lift the steel pipe for detection again, the staff first uses the control terminal to control the electric fixture 8 and the side plates 7 to clamp the steel pipe, and then lift it. Since the push rod 93 is no longer squeezed by the plane, the first switch 52 and the second switch 83 are no longer squeezed, and the circuit will be closed. At this time, the staff cannot use the control terminal to control the operation of the electric fixture 8 and the side plates 7 anymore, and there is no risk of the steel pipe falling due to accidental touch.

[0034] Embodiment 2

[0035] Please refer to Figure 1 、 Figure 4 and Figure 5, based on the first embodiment, further improvements are made:

[0036] When detecting a steel pipe, it is insufficient to detect only one surface. Therefore, a rotating mechanism 10 is provided on one side opposite to the two side plates 7. The rotating mechanism 10 can drive the steel pipe to rotate, so that other surfaces of the steel pipe face the laser rangefinder 2 for detection. The rotating mechanism 10 includes two circular grooves 101, which are respectively opened on one side opposite to the two side plates 7. Tooth discs 102 are rotatably connected to the walls of the circular grooves 101. Installation grooves are opened on the lower sides of the walls of the circular grooves 101, and gears 103 are arranged in the installation grooves. Driving motors are installed in the middle of each gear 103. Each gear 103 is meshed with the corresponding tooth disc 102. A steel pipe to be detected is clamped between the two tooth discs 102. When using the rotating mechanism 10 for detection, the two gears 103 are driven by the driving motors to rotate simultaneously, and the tooth discs 102 rotate accordingly. Since a pair of tooth discs 102 clamp the two ends of the steel pipe, when the two tooth discs 102 rotate, the steel pipe rotates accordingly, which is convenient for other surfaces of the steel pipe to face the laser rangefinder 2 for detection.

[0037] When detecting a steel pipe, the detection range is not comprehensive when the laser rangefinder 2 is fixedly installed. Therefore, a moving mechanism 11 is installed inside the mounting plate 1. The moving mechanism 11 drives the laser rangefinder 2 to translate, which is convenient for detecting other positions in the horizontal direction of the steel pipe. The moving mechanism 11 includes a third motor 111, which is fixedly connected to one end inside the mounting plate 1. The output end of the third motor 111 is fixedly connected to a second lead screw 112. The end of the second lead screw 112 far from the third motor 111 is rotatably connected to the inner end wall of the mounting plate 1. A slider 113 is threadedly connected to the surface of the second lead screw 112. The slider 113 extends to the outside of the mounting plate 1. The laser rangefinder 2 is fixedly connected to the bottom end of the slider 113. When using the moving mechanism 11 to drive the laser rangefinder 2 for detection, the third motor 111 operates to drive the second lead screw 112 to rotate. When the second lead screw 112 rotates, it drives the slider 113 to move, so that the laser rangefinder 2 can move horizontally to facilitate the detection of each position of the steel pipe.

[0038] Embodiment Three

[0039] Please refer to Figure 1 , based on the first embodiment, further improvements are made:

[0040] Manual lifting is too troublesome. Therefore, the lifting spreader 3 includes a first motor 31, which is fixedly connected to the middle of the bottom end of the mounting plate 1. The first motor 31 is a double-headed motor, and both ends of the first motor 31 are fixedly connected with connecting rods 32. Both sides of the bottom end of the mounting plate 1 are fixedly connected with side blocks, and the mutually remote ends of the two connecting rods 32 are rotatably connected to the middle of the corresponding side blocks. The mutually remote side surfaces of the two connecting rods 32 are both wound with lifting ropes 33, and the lower ends of the two lifting ropes 33 are respectively fixedly connected to both sides of the upper end of the connecting plate 4. When the lifting spreader 3 operates, the first motor 31 is turned on to drive the connecting rods 32 at both ends to rotate, thereby driving the two lifting ropes 33 to wind up for lifting.

[0041] Embodiment 4

[0042] Please refer to Figure 1 、 Figure 2 and Figure 6 On the basis of Embodiment 1, further improvements are made:

[0043] The moving guide rail 5 is driven by a second motor 51, which is fixedly connected to one end inside the connecting plate 4. The output end of the second motor 51 is fixedly connected with a first lead screw 53. The end of the first lead screw 53 away from the second motor 51 is rotatably connected to the other end inside the connecting plate 4. The first lead screw 53 is a bidirectional lead screw, and both sides of the first lead screw 53 are threadedly connected with moving blocks 54. The lower ends of the moving blocks 54 all penetrate through the bottom wall opening of the connecting plate 4 and are fixedly connected with the corresponding fixture top plates 6. When the moving guide rail 5 operates, the second motor 51 is started to drive the first lead screw 53 to rotate, and the moving blocks 54 on both sides of the first lead screw 53 move accordingly, driving the corresponding fixture top plates 6 to move.

[0044] The electric fixture 8 is driven by an electric telescopic rod 81. Each electric fixture 8 is formed by docking a pair of arc-shaped clamping plates 82. Both ends of the steel pipe to be detected are clamped between a pair of arc-shaped clamping plates 82. Each pair of electric telescopic rods 81 is fixedly connected to both sides of the fixture top plate 6, and the output end of each electric telescopic rod 81 is fixedly connected to the upper part outside the corresponding arc-shaped clamping plate 82. When the electric fixture 8 clamps, each pair of electric telescopic rods 81 operates to drive the corresponding pair of arc-shaped clamping plates 82 to approach each other until they are clamped on both sides of the steel pipe, and the clamping can be completed.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A bridge and tunnel material detection device with a protection structure, comprising a mounting plate (1), a laser rangefinder (2) is installed on one side of the front surface of the mounting plate (1), and a lifting sling (3) is installed at the bottom end of the mounting plate (1), characterized in that, A connecting plate (4) is installed at the lower end of the lifting sling (3). The interior of the connecting plate (4) is hollow and a moving guide rail (5) is installed. Clamping plate tops (6) are arranged on both sides of the lower end of the moving guide rail (5). Side plates (7) are fixedly connected to the middle parts of the lower ends of the clamping plate tops (6). Electric clamps (8) are arranged on one side of each pair of opposite side plates (7). A steel pipe to be detected is installed between the two electric clamps (8). Protection mechanisms (9) are arranged on one side of each pair of opposite side plates (7) away from each other. Each of the electric clamps (8) includes a pair of electric telescopic rods (81) for controlling the operation of the clamps. Second switches (83) are installed on one side of the bottom end of each clamping plate top (6). The second switches (83) are used to control the operation of the corresponding pair of electric telescopic rods (81). The moving guide rail (5) includes a second motor (51) for driving the operation of the guide rail. A first switch (52) is installed on one side of the bottom end of the connecting plate (4). The first switch (52) is used to control the operation of the second motor (51). The protection mechanisms (9) include a first protection plate (91) and a second protection plate (92). The first protection plate (91) and the second protection plate (92) are respectively fixedly connected to one side of each pair of opposite side plates (7) away from each other. Thrust rods (93) are inserted in the middle of the first protection plate (91) and on both sides of the second protection plate (92). Springs (94) are fixedly connected to the bottom ends of the thrust rods (93) through connecting blocks. The upper ends of the springs (94) are fixedly connected to the bottom ends of the corresponding first protection plate (91) and second protection plate (92). Each of the electric clamps (8) is formed by butting a pair of arc-shaped clamping plates (82). Both ends of the steel pipe to be detected are clamped between the pair of arc-shaped clamping plates (82). Each pair of electric telescopic rods (81) is fixedly connected to both sides of the clamping plate top (6). The output end of each electric telescopic rod (81) is fixedly connected to the upper part of the outer side of the corresponding arc-shaped clamping plate (82).

2. The bridge and tunnel material detection device with a protection structure according to claim 1, characterized in that: A rotating mechanism (10) is arranged on one side of each pair of opposite side plates (7). The rotating mechanism (10) includes two circular grooves (101). The two circular grooves (101) are respectively opened on one side of each pair of opposite side plates (7). Tooth discs (102) are rotatably connected to the groove walls of the circular grooves (101). Installation grooves are opened on the lower sides of the groove walls of the circular grooves (101) and gears (103) are arranged in the installation grooves. Driving motors are installed in the middle of each of the gears (103). Each of the gears (103) is meshed with the corresponding tooth disc (102). The steel pipe to be detected is clamped between the two tooth discs (102).

3. The bridge and tunnel material detection device with a protection structure according to claim 2, characterized in that: A moving mechanism (11) is installed inside the mounting plate (1). The moving mechanism (11) includes a third motor (111) fixedly connected to one end inside the mounting plate (1). The output end of the third motor (111) is fixedly connected to a second lead screw (112). The end of the second lead screw (112) away from the third motor (111) is rotatably connected to the inner end wall of the mounting plate (1). A slider (113) is threadedly connected to the surface of the second lead screw (112). The slider (113) extends outside the mounting plate (1). The laser rangefinder (2) is fixedly connected to the bottom end of the slider (113).

4. The bridge and tunnel material detection device with a protection structure according to claim 1, characterized in that: The lifting sling (3) includes a first motor (31) fixedly connected to the middle of the bottom end of the mounting plate (1). The first motor (31) is a double-headed motor. Connecting rods (32) are fixedly connected to both ends of the first motor (31). Side blocks are fixedly connected to both sides of the bottom end of the mounting plate (1). The ends of the two connecting rods (32) away from each other are rotatably connected to the middle of the corresponding side blocks. Hoisting ropes (33) are wound around the surfaces of the two connecting rods (32) away from each other. The lower ends of the two hoisting ropes (33) are fixedly connected to both sides of the upper end of the connecting plate (4).

5. The bridge and tunnel material detection device with a protection structure according to claim 1, wherein: A second motor (51) is fixedly connected to one end inside the connecting plate (4). The output end of the second motor (51) is fixedly connected to a first lead screw (53). The end of the first lead screw (53) away from the second motor (51) is rotatably connected to the other end inside the connecting plate (4). The first lead screw (53) is a bidirectional lead screw. Moving blocks (54) are threadedly connected to both sides of the first lead screw (53). The lower ends of the moving blocks (54) penetrate through the openings in the bottom wall of the connecting plate (4) and are fixedly connected to the corresponding fixture top plates (6).

6. The bridge and tunnel material detection device with a protection structure according to claim 1, characterized in that: The distances between the bottom ends of the first switch (52) and the second switch (83) and the upper ends of the corresponding ejector rods (93) are equal.

7. The detection method of a bridge and tunnel material detection device with a protection structure according to claim 3 includes the following steps: A1: First, clamp the steel pipe. The two side plates (7) can be driven to approach each other relatively through the moving guide rail (5), so that the steel pipe is clamped between the two side plates (7). Then, the two ends of the steel pipe to be detected are clamped by the electric fixture (8), so that the two ends of the steel pipe are limited within the electric fixture (8). Through the cooperation of the electric fixture (8) and a pair of side plates (7), the position of the steel pipe can be fixed. A2: The connecting pipe (4) with the steel pipe can be lifted by the lifting sling (3), and the steel pipe is moved to be detected relative to the laser rangefinder (2). The distance data between the emitting end of the laser rangefinder (2) and the surface of the steel pipe is detected. When the difference between the distance data at a certain place on the surface of the steel pipe and the normal distance is too large, it indicates that there is a pit or damage. A3: In the lifted state, the ejector rod (93) of the protection mechanism (9) is not squeezed by the plane, the first switch (52) and the second switch (83) are not squeezed, and the circuit will be closed. At this time, the staff cannot use the control terminal to control the operation of the electric clamp (8) and the side plate (7), and there is no risk of the steel pipe falling due to accidental touch. In the landed state, when the ejector rod (93) is squeezed by the plane and moves upward, it will squeeze the corresponding first switch (52) and second switch (83). At this time, the first switch (52) and the second switch (83) are squeezed and in the open state, the circuit is connected, and the electric telescopic rod (81) and the second motor (51) can operate. Only then can the staff use the control terminal to control the operation of the electric clamp (8) and the side plate (7) to remove the steel pipe. A4: The rotating mechanism (10) can drive the steel pipe to rotate, so that other surfaces of the steel pipe face the laser rangefinder (2) for detection. The moving mechanism (11) drives the laser rangefinder (2) to translate, which is convenient for detecting other lateral positions of the steel pipe, and the detection range is more comprehensive.

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