A flatness detection device for construction engineering

Abstract

The application discloses a flatness detection device for building engineering and relates to the technical field of flatness detection, which comprises a moving frame, a fixed frame fixedly installed at the bottom of the moving frame, a roller rotatably installed on the inner wall of the fixed frame, a recess formed in the surface of the moving frame, a measuring plate fixedly installed on the inner wall of the recess, a sensor fixedly installed on the inner wall of the recess, a square sliding block fixedly installed on the surface of the measuring plate, an L-shaped frame fixedly installed at the bottom of the square sliding block, an L-shaped pull rod installed on the top of the square sliding block, and a measuring pulley rotatably installed on the inner wall of the L-shaped frame.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flatness detection, in particular to a flatness detection device for building engineering. BACKGROUND

[0002] In the construction industry, after the completion of ground building, the flatness detection needs to be carried out, and the deviation value and the design deviation range are compared to determine whether the construction quality meets the standard, so as to facilitate the normal progress of the next construction process of the building engineering.

[0003] The patent with patent number CN216205977U relates to a flatness detection device for building engineering, which comprises a mobile base, a measuring sleeve rod is fixed on the outer side wall of the front side of the mobile base, a mobile measuring rod is slidably connected to the bottom of the measuring sleeve rod, fixed sliding grooves are formed in the inner cavity of the measuring sleeve rod, a lifting slide block is fixed on the top of the mobile measuring rod and is slidably connected with the fixed sliding grooves, the lifting slide block is elastically connected with the inner cavity of the measuring sleeve rod through an extension spring, a pulley mounting seat is fixed on the bottom of the mobile measuring rod, a measuring pulley is installed on the bottom of the pulley mounting seat, and a positioning detection mechanism is arranged on the top of the mobile base.

[0004] In the above-mentioned patent, the lifting slide block is lifted by the measuring pulley, the lifting distance is recorded, and the position of the protrusion is marked on the detection tape, if the ground is depressed, the lifting slide block is lowered by the measuring pulley, the lowering distance is recorded, and the position of the depression is marked on the detection tape, which is convenient for subsequent repair. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a flatness detection device for building engineering, which solves the problems raised in the above background.

[0006] To achieve the above object, the application is implemented by the following technical solutions: A flatness detection device for construction engineering, comprising: a moving frame, a fixed frame is fixedly installed at the bottom of the moving frame, a roller is rotatably installed on the inner wall of the fixed frame, a recess is formed on the surface of the moving frame, a measuring plate is fixedly installed on the inner wall of the recess, a sensor is fixedly installed on the inner wall of the recess, a square slide is fixedly installed on the surface of the measuring plate, an L-shaped frame is fixedly installed at the bottom of the square slide, an L-shaped pull rod is installed at the top of the square slide, and a measuring pulley is rotatably installed on the inner wall of the L-shaped frame; a detection device is arranged on the surface of the measuring plate, the detection device comprises a square frame, a rotating plate, a push plate, a sliding plate, a rotating plate, a limiting plate, a square block, a sliding block, a connecting plate and an L-shaped plate, the measuring pulley is in contact with the ground, and when a protrusion or a depression is encountered, the measuring pulley is pushed to move upwards or downwards, the upward or downward movement of the measuring pulley drives the L-shaped frame to move upwards or downwards, and the upward or downward movement of the L-shaped frame drives the square slide to move upwards or downwards, the square frame is fixedly installed at the bottom of the moving frame, the rotating plate is rotatably installed on the inner wall of the square frame, the push plate is fixedly installed at the bottom of the rotating plate, the sliding plate is slidably installed at the bottom of the square frame, the rotating plate is rotatably installed at the bottom of the sliding plate, the limiting plate is fixedly installed at the bottom of the sliding plate, the square block is fixedly installed on the surface of the L-shaped frame, the sliding block is slidably installed on the inner wall of the square frame, the connecting plate is fixedly installed on the surface of the sliding block, and the L-shaped plate is fixedly installed at the top of the sliding plate; the connecting plate moves away from the square block, which pushes the L-shaped plate to move away from the square block, and the movement of the L-shaped plate away from the square block drives the sliding plate to move away from the square block.

[0007] According to the above technical solutions, a spring is arranged between the measuring plate and the square slide, the square slide is reset by the spring, a torsion spring is arranged between the rotating plate and the square frame, the rotating plate is reset by the torsion spring, a spring is arranged between the sliding plate and the square frame, the sliding plate is reset by the spring, a spring is arranged between the sliding block and the square frame, the sliding block is reset by the spring, and a torsion spring is arranged between the rotating plate and the sliding plate, the rotating plate is reset by the torsion spring.

[0008] According to the above technical solutions, a marking device for marking uneven ground is arranged on the measuring plate, a limiting device is arranged on the marking device, the marking device comprises a connecting frame, a rotating wheel and a measuring slide plate, the measuring pulley moves upwards or downwards when contacting a protrusion or a depression, which drives the connecting frame to move upwards or downwards, and the upward or downward movement of the connecting frame drives the rotating wheel to move upwards or downwards, the connecting frame is fixedly installed on the surface of the square slide, the rotating wheel is rotatably installed on the inner wall of the connecting frame, and the measuring slide plate is slidably installed on the surface of the measuring plate.

[0009] According to the technical scheme, the L-shaped frame surface is slidably installed with an L-shaped rod, the L-shaped rod surface is fixedly installed with an L-shaped short plate, the L-shaped frame interior is slidably installed with a sliding rod, the sliding rod top is fixedly installed with a trapezoidal plate, the sliding rod bottom is fixedly installed with an elastic telescopic rod, and the elastic telescopic rod free end is fixedly installed with a marker pen. The trapezoidal plate downward movement drives the sliding rod to move downward, the sliding rod downward movement drives the elastic telescopic rod to move downward, and the elastic telescopic rod downward movement drives the marker pen to move downward.

[0010] According to the technical scheme, the measuring slide and the measuring plate are provided with the fourth spring, the L-shaped frame and the L-shaped rod are provided with the fifth spring, and the L-shaped frame and the sliding rod are provided with the sixth spring.

[0011] According to the technical scheme, the limiting device comprises a sliding seat, a rotating plate, a limiting block, a short plate and an elastic telescopic plate. The L-shaped pull rod is moved upward to drive the contact to rotate. The rotating plate is pushed to rotate upward. When the L-shaped pull rod is separated from the rotating plate, the sliding seat is slidably installed on the surface of the measuring plate, the rotating plate is rotatably installed on the surface of the sliding seat, the limiting block is fixedly installed on the circumferential surface of the rotating plate, the short plate is fixedly installed on the top of the sliding seat, and the elastic telescopic plate is fixedly installed on the surface of the measuring plate.

[0012] According to the technical scheme, the elastic telescopic plate free end is fixedly installed with an L-shaped long plate, the L-shaped long plate far side from the elastic telescopic plate is fixedly installed with a trapezoidal block, the measuring slide surface is fixedly installed with a baffle, the baffle is moved to the measuring plate middle part to drive the baffle to move to the measuring plate middle part, the baffle is moved to the measuring plate middle part to drive the trapezoidal block and the L-shaped long plate to move upward, and the L-shaped long plate upward movement drives the elastic telescopic plate free end to move upward.

[0013] According to the technical scheme, the sliding seat and the measuring plate are provided with the seventh spring, the rotating plate and the sliding seat are provided with the third torsional spring, and the sliding seat is reset by the seventh spring and the rotating plate is reset by the third torsional spring.

[0014] The application provides a flatness detection device for building engineering. The device has the following advantages:

[0015] (1) In this invention, when the measuring pulley contacts the ground and encounters a protrusion or depression, it will push the measuring pulley to move up or down. The height of the square slider rising or falling will be displayed on the measuring plate. At the same time, the limiting plate will limit the rotating plate in one direction. The rotating plate limits the rotating plate to prevent the rotating plate from rotating when pushing excessively heavy materials, which would affect the detection effect. The L-shaped plate moving away from the square block will drive the sliding plate to move away from the square block. The sliding plate moving away from the square block will drive the rotating plate to release the limit on the rotating plate, so that the first torsion spring drives the rotating plate to reset, which improves the protection of the equipment and increases its service life.

[0016] (2) In this invention, the measuring slide moves away from the rotating wheel when the rotating wheel moves up or down. The height of the rotating wheel rises or falls in conjunction with the sensor to detect the height of the protrusion or depression. At the same time, the sliding rod moves down, which drives the elastic telescopic rod to move down. The elastic telescopic rod moves down, which drives the marking pen to move down. The marking pen moves down and contacts the ground, leaving a mark on the ground, which is convenient for subsequent workers to process.

[0017] (3) In this invention, the rotating plate is limited by the limiting block to prevent the L-shaped pull rod from moving downward. When the equipment needs to be used, the sliding seat is moved away from the L-shaped pull rod by sliding the sliding seat, which will release the limitation on the L-shaped pull rod. When the short plate is separated from the free end of the elastic telescopic plate, the elastic force of the elastic telescopic plate itself will drive the free end of the elastic telescopic plate to reset and limit the short plate. It is not necessary to pull the sliding seat by hand all the time, which improves the applicability. At the same time, the upward movement of the L-shaped long plate will drive the free end of the elastic telescopic plate to move upward. The upward movement of the free end of the elastic telescopic plate will release the limitation on the short plate, so that the short plate and the sliding seat are reset, which is convenient for subsequent use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the square frame of the present invention;

[0021] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of section A in the middle;

[0022] Figure 5 This is a schematic diagram of the marking device structure of the present invention;

[0023] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of section B;

[0024] Figure 7 For the application limit device structure schematic diagram;

[0025] Figure 8 For the application Figure 7 C part structure amplification schematic diagram.

[0026] Figure: 1, mobile frame; 2, fixed frame; 3, roller; 4, measuring plate; 41, sensor; 5, square slider; 6, L-shaped frame; 7, measuring pulley; 8, square frame; 9, rotating plate; 10, push plate; 11, sliding plate; 12, rotating plate; 13, limit plate; 14, square block; 15, sliding block; 16, connecting plate; 17, L-shaped plate; 181, connecting frame; 182, rotating wheel; 183, measuring slide; 184, L-shaped rod; 185, L-shaped short plate; 186, sliding rod; 187, trapezoidal plate; 188, elastic telescopic rod; 189, marker pen; 1810, L-shaped pull rod; 191, sliding seat; 192, rotating plate; 193, limit block; 194, short plate; 195, elastic telescopic plate; 196, L-shaped long plate; 197, trapezoidal block; 198, baffle. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0028] Please refer to Figures 1-4One embodiment of the present application is: a flatness detection device for construction engineering, comprising: a moving frame 1, a fixed frame 2 is fixedly installed at the bottom of the moving frame 1, a roller 3 is rotatably installed on the inner wall of the fixed frame 2, a recess is formed on the surface of the moving frame 1, a measuring plate 4 is fixedly installed on the inner wall of the recess, a sensor 41 is fixedly installed on the inner wall of the recess, a square slide 5 is fixedly installed on the surface of the measuring plate 4, an L-shaped frame 6 is fixedly installed at the bottom of the square slide 5, an L-shaped pull rod 1810 is installed at the top of the square slide 5, and a measuring pulley 7 is rotatably installed on the inner wall of the L-shaped frame 6; a detection device is arranged on the surface of the measuring plate 4, and the detection device comprises a square frame 8, a rotating plate 9, a push plate 10, a sliding plate 11, a rotating plate 12, a limiting plate 13, a square block 14, a sliding block 15, a connecting plate 16 and an L-shaped plate 17, the push plate 10 can block the impurities in front of the measuring pulley 7, preventing the impurities from lifting the measuring pulley 7 and affecting the detection result, the square frame 8 is fixedly installed at the bottom of the moving frame 1, the rotating plate 9 is rotatably installed on the inner wall of the square frame 8, the push plate 10 is fixedly installed at the bottom of the rotating plate 9, the sliding plate 11 is slidingly installed at the bottom of the square frame 8, the rotating plate 12 is rotatably installed at the bottom of the sliding plate 11, the limiting plate 13 is fixedly installed at the bottom of the sliding plate 11, the square block 14 is fixedly installed on the surface of the L-shaped frame 6, the sliding block 15 is slidingly installed on the inner wall of the square frame 8, the connecting plate 16 is fixedly installed on the surface of the sliding block 15, and the L-shaped plate 17 is fixedly installed at the top of the sliding plate 11; moving the sliding plate 11 away from the square block 14 can drive the rotating plate 12 to release the limiting of the rotating plate 9, thereby improving the protection of the equipment and prolonging the service life.

[0029] A first spring is arranged between the measuring plate 4 and the square slide 5, the square slide 5 is reset by the first spring, a first torsional spring is arranged between the rotating plate 9 and the square frame 8, the rotating plate 9 is reset by the first torsional spring, a second spring is arranged between the sliding plate 11 and the square frame 8, the sliding plate 11 is reset by the second spring, a third spring is arranged between the sliding block 15 and the square frame 8, the sliding block 15 is reset by the third spring, and a second torsional spring is arranged between the rotating plate 12 and the sliding plate 11, the rotating plate 12 is reset by the second torsional spring.

[0030] The working principle of the embodiment is as follows: when the measuring pulley 7 is in contact with the ground, the measuring pulley 7 is pushed to move upward or downward when encountering a protruding or recessed place, the L-shaped frame 6 is driven to move upward or downward by the upward or downward movement of the measuring pulley 7, the square-shaped sliding block 5 is driven to move upward or downward by the upward or downward movement of the L-shaped frame 6, the height of the upward or downward movement of the square-shaped sliding block 5 is displayed on the measuring plate 4, and meanwhile, the rotating plate 9 is pushed to rotate downward when detection is performed, the rotating plate 9 is driven to rotate downward, the push plate 10 is driven to rotate downward, the impurities in front of the measuring pulley 7 are blocked by the push plate 10, the impurities are prevented from lifting the measuring pulley 7 to affect the detection result, the rotating plate 9 is driven to rotate when the rotating plate 9 is separated from the rotating plate 12, the second torsional spring drives the reset, the rotating plate 12 is one-way limited by the limiting plate 13, the rotating plate 9 is limited by the rotating plate 12, the rotating plate 9 is prevented from rotating when a material is pushed too hard to affect the detection effect, the L-shaped pull rod 1810 is pulled to move upward when not in use, the L-shaped pull rod 1810 is driven to move upward, the square-shaped sliding block 5 and the L-shaped frame 6 are driven to move upward by the upward movement of the L-shaped pull rod 1810, the square-shaped block 14 is driven to move upward by the upward movement of the L-shaped frame 6, the sliding block 15 is driven to move away from the square-shaped block 14 by the upward movement of the square-shaped block 14, the connecting plate 16 is driven to move away from the square-shaped block 14 by the movement of the sliding block 15, the L-shaped plate 17 is driven to move away from the square-shaped block 14 by the movement of the connecting plate 16, the sliding plate 11 is driven to move away from the square-shaped block 14 by the movement of the L-shaped plate 17, the rotating plate 12 is driven to release the limiting of the rotating plate 9 by the movement of the sliding plate 11, the first torsional spring drives the rotating plate 9 to reset, the protection of the equipment is improved, and the service life is improved.

[0031] Please refer to Figures 1-7 On the basis of the above embodiment, in another embodiment of the present application, a marking device for marking uneven ground is arranged on the measuring plate 4, a limiting device is arranged on the marking device, the marking device comprises a connecting frame 181, a rotating wheel 182 and a measuring slide plate 183, the connecting frame 181 is fixedly installed on the surface of the square-shaped sliding block 5, the rotating wheel 182 is rotatably installed on the inner wall of the connecting frame 181, and the measuring slide plate 183 is slidably installed on the surface of the measuring plate 4; the measuring slide plate 183 is driven to move away from the rotating wheel 182, the height of the upward or downward movement of the rotating wheel 182 is detected by the sensor 41.

[0032] The L-shaped rod 184 is slidably installed on the surface of the L-shaped frame 6, the L-shaped short plate 185 is fixedly installed on the surface of the L-shaped rod 184, the sliding rod 186 is slidably installed in the L-shaped frame 6, the trapezoidal plate 187 is fixedly installed on the top of the sliding rod 186, the elastic telescopic rod 188 is fixedly installed at the bottom of the sliding rod 186, and the marker pen 189 is fixedly installed at the free end of the elastic telescopic rod 188. The marker pen 189 is moved downward to contact the ground, and leaves marks on the ground, which is convenient for subsequent workers to process.

[0033] The fourth spring is arranged between the measuring slide plate 183 and the measuring plate 4, the fourth spring drives the measuring slide plate 183 to reset, the fifth spring is arranged between the L-shaped frame 6 and the L-shaped rod 184, the fifth spring drives the L-shaped rod 184 to reset, and the sixth spring is arranged between the L-shaped frame 6 and the sliding rod 186. The sixth spring drives the sliding rod 186 to reset.

[0034] The limiting device comprises a sliding seat 191, a rotating plate 192, a limiting block 193, a short plate 194 and an elastic telescopic plate 195, the sliding seat 191 is slidably installed on the surface of the measuring plate 4, the rotating plate 192 is rotatably installed on the surface of the sliding seat 191, the limiting block 193 is fixedly installed on the circumferential surface of the rotating plate 192, the short plate 194 is fixedly installed on the top of the sliding seat 191, the elastic telescopic plate 195 is fixedly installed on the surface of the measuring plate 4, and the limiting block 193 limits the rotating plate 192. The L-shaped pull rod 1810 is prevented from moving downward.

[0035] The L-shaped long plate 196 is fixedly installed at the free end of the elastic telescopic plate 195, the trapezoidal block 197 is fixedly installed on the side, away from the elastic telescopic plate 195, of the L-shaped long plate 196, the baffle 198 is fixedly installed on the surface of the measuring slide plate 183, and the free end of the elastic telescopic plate 195 moves upward to release the limiting of the short plate 194, so that the short plate 194 and the sliding seat 191 reset, and subsequent use is facilitated.

[0036] The seventh spring is arranged between the sliding seat 191 and the measuring plate 4, the seventh spring drives the sliding seat 191 to reset, the third torsional spring is arranged between the rotating plate 192 and the sliding seat 191, and the third torsional spring drives the rotating plate 192 to reset.

[0037] When the measuring pulley 7 contacts the concave part of the convex part, the measuring pulley 7 moves up or down, which drives the connecting frame 181 to move up or down, and the connecting frame 181 drives the rotating wheel 182 to move up or down, which drives the measuring slide plate 183 to move away from the rotating wheel 182, and the measuring slide plate 183 moves away from the rotating wheel 182, which drives the L-shaped rod 184 to move away from the rotating wheel 182, and the L-shaped rod 184 drives the L-shaped short plate 185 to move away from the rotating wheel 182, which drives the trapezoidal plate 187 to move down, and the trapezoidal plate 187 drives the sliding rod 186 to move down, which drives the elastic telescopic rod 188 to move down, and the elastic telescopic rod 188 drives the marker pen 189 to move down, which contacts the ground and leaves marks on the ground, facilitating subsequent workers to handle.

[0038] When the L-shaped pull rod 1810 moves up and contacts the rotating plate 192, the rotating plate 192 is pushed to rotate upward, and when the L-shaped pull rod 1810 is separated from the rotating plate 192, the third torsional spring drives the rotating plate 192 to reset, and the limiting block 193 limits the rotating plate 192 to prevent the L-shaped pull rod 1810 from moving downward. When the device is needed, the sliding seat 191 is slid to move away from the L-shaped pull rod 1810, which releases the limitation of the L-shaped pull rod 1810, and the sliding seat 191 drives the short plate 194 to move away from the L-shaped pull rod 1810, which contacts the free end of the elastic telescopic plate 195, and the short plate 194 drives the free end of the elastic telescopic plate 195 to move upward. When the short plate 194 is separated from the free end of the elastic telescopic plate 195, the elastic force of the elastic telescopic plate 195 drives the free end of the elastic telescopic plate 195 to reset and limit the short plate 194, so that the hand does not need to be pulled all the time, improving the applicability. At the same time, the L-shaped pull rod 1810 resets to release the extrusion of the measuring slide plate 183, and the measuring slide plate 183 moves to the middle of the measuring plate 4, which drives the baffle 198 to move to the middle of the measuring plate 4, and the baffle 198 drives the trapezoidal block 197 and the L-shaped long plate 196 to move upward, which drives the free end of the elastic telescopic plate 195 to move upward, and the free end of the elastic telescopic plate 195 releases the limitation of the short plate 194, so that the short plate 194 and the sliding seat 191 reset, facilitating subsequent use.

[0039] While embodiments of the present application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and spirit of the present application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents.

Claims

1. A flatness testing device for building construction, characterized in that, The utility model relates to a movable frame (1), the movable frame (1) bottom fixed mounting has fixed frame (2), the fixed frame (2) inner wall rotationally installed have gyro wheel (3), the movable frame (1) surface is set with recess, the recess inner wall fixed mounting has measuring board (4), the recess inner wall fixed mounting has sensor (41), the measuring board (4) surface fixed mounting has square slide (5), square slide (5) bottom fixed mounting has L shape frame (6), square slide (5) top installation has L shape pull rod (1810), the L shape frame (6) inner wall rotationally installed have measuring pulley (7); Detection device, the detection device sets up on measuring board (4) surface, the detection device includes square frame (8), rotationally installed board (9), push board (10), sliding board (11), rotationally installed board (12), limiting board (13), square block (14), sliding block (15), connecting plate (16) and L shape board (17), square frame (8) fixed mounting is at movable frame (1) bottom, rotationally installed board (9) is installed in square frame (8) inner wall, push board (10) fixed mounting is at rotationally installed board (9) bottom, sliding board (11) sliding installation is at square frame (8) bottom, rotationally installed board (12) is installed in sliding board (11) bottom, limiting board (13) fixed mounting is at sliding board (11) bottom, square block (14) fixed mounting is at L shape frame (6) surface, sliding block (15) sliding installation is in square frame (8) inner wall, connecting plate (16) fixed mounting is at sliding block (15) surface, L shape board (17) fixed mounting is at sliding board (11) top; Wherein, the measuring board (4) is provided with the marking device for marking uneven ground, the marking device is provided with the limiting device; The marking device includes connecting frame (181), rotating wheel (182) and measuring slide (183), the connecting frame (181) is fixedly installed on the surface of square slide (5), the rotating wheel (182) is rotatably installed in the inner wall of connecting frame (181), and the measuring slide (183) is slidably installed on the surface of measuring board (4); The surface of the L-shaped frame (6) is slidably installed with an L-shaped rod (184), the surface of the L-shaped rod (184) is fixedly installed with an L-shaped short plate (185), the inside of the L-shaped frame (6) is slidably installed with a sliding rod (186), the top of the sliding rod (186) is fixedly installed with a trapezoidal plate (187), the bottom of the sliding rod (186) is fixedly installed with an elastic telescopic rod (188), and the free end of the elastic telescopic rod (188) is fixedly installed with a marking pen (189); ​ The limiting device includes a sliding seat (191), a rotating plate (192), a limiting block (193), a short plate (194) and an elastic telescopic plate (195), the sliding seat (191) is slidingly installed on the surface of the measuring plate (4), the rotating plate (192) is rotatably installed on the surface of the sliding seat (191), the limiting block (193) is fixedly installed on the circumferential surface of the rotating plate (192), the short plate (194) is fixedly installed on the top of the sliding seat (191), and the elastic telescopic plate (195) is fixedly installed on the surface of the measuring plate (4). The free end of the elastic telescopic plate (195) is fixedly installed with an L-shaped long plate (196), one side of the L-shaped long plate (196) away from the elastic telescopic plate (195) is fixedly installed with a trapezoidal block (197), and the surface of the measuring sliding plate (183) is fixedly installed with a baffle (198).

2. The flatness detection device for construction engineering according to claim 1, characterized in that: A first spring is arranged between the measuring plate (4) and the square sliding block (5), a first torsional spring is arranged between the rotating plate (9) and the square frame (8), a second spring is arranged between the sliding plate (11) and the square frame (8), a third spring is arranged between the sliding block (15) and the square frame (8), and a second torsional spring is arranged between the rotating plate (12) and the sliding plate (11).

3. The flatness detection device for construction engineering according to claim 2, characterized in that: A fourth spring is arranged between the measuring sliding plate (183) and the measuring plate (4), a fifth spring is arranged between the L-shaped frame (6) and the L-shaped rod (184), and a sixth spring is arranged between the L-shaped frame (6) and the sliding rod (186).

4. The flatness detection device for construction engineering according to claim 3, characterized in that: A seventh spring is arranged between the sliding seat (191) and the measuring plate (4), and a third torsional spring is arranged between the rotating plate (192) and the sliding seat (191).

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