House building wall surface construction flatness measuring device

Abstract

The invention relates to the technical field of building construction detection, in particular to a house building wall surface construction flatness measuring device which comprises a main plate, first rolling wheels are installed at the bottom of the main plate, an adjusting assembly used for adjusting the angle of the main plate is installed at the bottom of the main plate, and the end, away from the main plate, of the adjusting assembly is rotationally connected with an abutting rod used for limiting the main plate. The end, away from the abutting rod, of the main board is rotationally connected with a measuring assembly used for surveying the wall face, and the concave-convex position of the wall face is recorded through the measuring assembly. During use, by arranging the adjusting assembly, the angle of the main board can be detected through the horizontal sensor in the gradienter, when the main board inclines along with the ground, the processing module installed in the horizontal sensor drives the adjusting assembly through the driving module to enable the hydraulic rod to stretch and contract, and when the special-shaped bent plate moves, the angle of the main board can be detected. And the first turning plate and the second turning plate are pulled to turn over, and the height of one end of the bottom of the main board is adjusted till the horizontal sensor detects that the main board is adjusted to be in a horizontal state.

Description

Technical Field

[0001] The invention relates to the field of building construction detection, and in particular to a device for measuring the flatness of a building wall construction. Background Art

[0002] The role of the wall of a building is very diverse and important. It is an important component of the building and plays an important role in load-bearing, enclosure, space division and decoration. It is an indispensable part of the building.

[0003] After a massive search, it was found that the prior art publication number is CN116734710B2, which discloses a device for measuring the flatness of the wall surface of a building, including a moving seat, a detachable vertical ruler is installed on the side wall of the moving seat, and a groove is opened on the side wall of the vertical ruler. A plurality of U-shaped plates are slidably connected inside the groove, and a detection wheel is rotatably provided inside each of the U-shaped plates, and each of the U-shaped plates is installed with a magnetic suction moving mechanism together with the groove. The present invention can measure whether the flatness within a certain square range of the wall surface is qualified. It not only covers the measurement comprehensively, but also does not require multiple readings. It is convenient and simple to operate, has good use effect, and can detect tiny roughness and unevenness of the wall surface such as water ripples and convex particles. At the same time, foreign objects that may be attached to the wall surface can be removed to avoid foreign objects affecting the detection accuracy, and the hollow points of the decorative coating can be detected as much as possible to improve the detection effect of the wall surface.

[0004] Therefore, based on the above search and in combination with the existing ones, the above device cannot be adjusted accordingly according to the inclination angle of the ground during use, resulting in that when the ground is tilted, the above device as a whole follows the ground angle and inclines, making it difficult to ensure its stability and causing an angle between it and the wall, making it impossible to fit, thereby causing the device to be unable to measure the wall. Moreover, after measuring the flatness of the wall, repairs are performed uniformly. This measure is suitable for the case where there are fewer recessed parts on the wall. If the protruding part of the wall accounts for a small proportion, a large amount of material is required to repair the wall, increasing construction costs and construction time. Based on the above problems, the present invention provides a device for measuring the flatness of the wall surface of a building. Summary of the invention

[0005] The purpose of the present invention is to provide a device for measuring the flatness of a building wall surface during construction, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: comprising a mainboard, a roller 1 is installed at the bottom of the mainboard, an adjustment component for adjusting the angle of the mainboard is installed at the bottom of the mainboard, an end of the adjustment component away from the mainboard is rotatably connected to a stop rod for limiting the mainboard, an end of the mainboard away from the stop rod is rotatably connected to a measuring component for surveying the wall surface, and the concave and convex parts of the wall surface are recorded by the measuring component, and a rotating component for driving the measuring component to expand the survey range is installed between the mainboard and the measuring component; The measuring component includes a support rod, which is rotatably connected to the end of the main board away from the support rod. A sliding rod is slidably connected inside the support rod. A pushing component for pushing the rod to move away from the main board is installed at the end of the sliding rod close to the main board. A bar is fixedly installed on the top of the inner cavity of the sliding rod, and a scanning device for counting the bars is installed on the top of the bar.

[0007] Furthermore, the pushing assembly includes a push plate, which is slidably connected to the top of the main board. The end of the push plate close to the sliding rod is fixedly connected with a push block for individually pushing each group of sliding rods to move. The number of push blocks is the same as that of the support rod inner cavity, and a torsion spring is installed to pull the push plate closer to the support rod.

[0008] Furthermore, a limit frame for limiting the position of the slide rod is slidably connected inside the support rod, and a second spring for pushing the limit frame to return to its original position is fixedly connected to the top of the limit frame.

[0009] Furthermore, an insertion rod for limiting the push block is slidably connected inside the support rod, and one end of the insertion rod close to the push block is fixedly connected to the push plate.

[0010] Furthermore, the adjustment component includes a spirit level, which is fixedly mounted on the side end of the outer wall of the main board, and the bottom of the spirit level is rotatably connected to flap one, and flap one is rotatably connected inside, and flap two is rotatably connected inside, and roller two is rotatably connected inside, and the end of flap one away from the support rod is rotatably connected to a hydraulic rod for pushing flap one and flap two to flip.

[0011] Furthermore, the outer wall of the push rod is rotatably connected to a clamp block four for connecting to the main board, and the bottom of the push rod is fixedly connected to a rubber push block for increasing friction.

[0012] Furthermore, the rotating assembly includes a gear, one end of the gear away from the mainboard is fixedly connected to the support rod, the bottom of the gear is meshingly connected to a rack, and the rack is rotatably connected to a pull rod for pulling the rack to move.

[0013] Furthermore, one end of the support rod away from the gear is rotatably connected to a rubber block for direct contact with the wall.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, by setting an adjustment component, the angle of the main board can be detected by the level sensor inside the spirit level. When the main board tilts with the ground, the processing module installed inside the level sensor drives the adjustment component through the driving module to extend and contract the hydraulic rod, so that when the special-shaped bent plate moves, the flap 1 and the flap 2 are pulled to flip, and the height of one end of the bottom of the main board is adjusted until the level sensor detects that the main board is adjusted to a horizontal state.

[0015] 2. When the present invention is used, the flatness of the wall is measured by setting a measuring component, and the concave and convex parts of the wall are recorded by the cooperation of the strips, scanning modules and counting modules. The collected data is then uniformly sorted and played through the display module, thereby helping the staff to view and analyze the proportion of the concave and convex parts of the wall, so as to help the staff to make countermeasures according to the proportion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural cross-sectional view of the support rod of the present invention; Figure 3 It is a schematic diagram of the module of the strip of the present invention; Figure 4 It is a structural schematic diagram of the driving assembly of the present invention; Figure 5 It is a structural schematic diagram of the measuring component of the present invention; Figure 6 It is a structural schematic diagram of the regulating assembly of the present invention; Figure 7 It is a schematic diagram of a module of a hydraulic rod of the present invention; Figure 8 It is a schematic structural diagram of the rotating assembly of the present invention.

[0017] In the figure: 1, main board; 2, adjustment component; 3, roller 1; 4, stop rod; 5, measuring component; 6, rotating component; 7, pushing component; 101, pull plate; 201, flap 1; 202, flap 2; 203, roller 2; 204, hydraulic rod; 205, clamping block 1; 206, special-shaped bending plate; 207, movable block; 208, clamping block 2; 209, clamping block 3; 210, level; 401, clamping block 4; 402, rubber stop block; 501, Sliding rod; 502, bar; 503, scanning device; 504, support rod; 505, sphere; 506, rubber block; 507, limit frame; 508, spring two; 509, square groove; 510, plug block; 511, press block; 601, gear; 602, rack; 603, pull rod; 604, motor; 605, rotating rod; 701, push plate; 702, push block; 703, torsion spring; 704, positioning block; 705, plug rod; 706, spring one. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0019] Example 1: Please refer to Figure 1 - Figure 8 A device for measuring the flatness of a wall surface during construction of a house building comprises a main board 1, a roller 3 is installed at the bottom of the main board 1, an adjusting component 2 for adjusting the angle of the main board 1 is installed at the bottom of the main board 1, and the adjusting component 2 is adjusted to a horizontal state when the device is used, and the end of the adjusting component 2 away from the main board 1 is rotatably connected to a stop rod 4 for limiting the main board 1, and when the stop rod 4 is unfolded, it can be pressed against the ground to prevent the device from moving during the detection process and affecting the detection result, and the end of the main board 1 away from the stop rod 4 is rotatably connected to a measuring component 5 for surveying the wall surface, and the concave and convex parts of the wall surface are recorded by the measuring component 5, and a rotating component 6 for driving the measuring component 5 to expand the survey range is installed between the main board 1 and the measuring component 5; The measuring assembly 5 includes a support rod 504, which is rotatably connected to the end of the main board 1 away from the support rod 4. The support rod 504 is slidably connected to the inside of the support rod 504. There are seven groups of slide rods 501 installed vertically in the inner cavity of the support rod 504, so that when the main board 1 is turned over, the slide rod 501 is driven to turn over. The end of the slide rod 501 close to the main board 1 is installed with a pushing assembly 7 for pushing the slide rod 501 to move away from the main board 1. A bar 502 is fixedly installed on the top of the inner cavity of the slide rod 501. A scanning device 503 for counting the bar 502 is installed on the top of the bar 502. Specifically, the slide rod 50 A spherical groove is provided in the inner cavity of the end away from the main board 1, and a ball 505 is rotatably connected in the inner cavity of the spherical groove. The end of the ball 505 away from the sliding rod 501 is attached to the wall surface, so that when the rotating component 6 drives the sliding rod 501 to rotate, the sliding rod 501 drives the ball 505 to move on the wall surface, thereby increasing the flexibility of the sliding rod 501; when the pushing component 7 pushes the sliding rod 501 to move toward the wall surface, the scanning module installed in the scanning device 503 can be used to record the number of bars 502 moving with the sliding rod 501, and record the values ​​of the concave and convex of the wall according to the bars 502; See also Figure 4 The pushing assembly 7 includes a pushing plate 701, which is slidably connected to the top of the main board 1. One end of the pushing plate 701 close to the sliding rod 501 is fixedly connected with a pushing block 702 for individually pushing each group of sliding rods 501 to move. The number of pushing blocks 702 is the same as that of the sliding rods 501, and the placement positions correspond to each other. The number of pushing blocks 702 and the inner cavity of the support rod 504 are installed with a torsion spring 703 for pulling the pushing plate 701 closer to the support rod 504. Specifically, the pushing plate 701 and the pushing block 702 are fixedly connected by a spring 706; a positioning block 704 for the top of the torsion spring 703 is fixedly connected inside the torsion spring 703, and the positioning block 704 passes through the torsion spring 703 and is fixedly connected to the inner cavity of the support rod 504; It is worth mentioning that the scanning device 503 uses a laser scanner to measure in real time the distance between the end of the sliding rod 501 and the push block 702 after the sliding rod 501 moves and abuts against the wall, and records it through the counting module in the processor. The processed data is usually converted from an analog signal to a digital signal and displayed through a display module. The above structural principle is an existing mature distance measurement method, and the present invention will not be described in detail; See also Figure 5, a limit frame 507 for limiting the position of the slide rod 501 is slidably connected inside the support rod 504, and a spring 508 for pushing the limit frame 507 to reset is fixedly connected to the side end of the limit frame 507. Specifically, a square groove 509 is provided inside the support rod 504, and the limit frame 507 is slidably connected to the inner cavity of the square groove 509. An insert block 510 is fixedly connected to the end of the limit frame 507 close to the slide rod 501, and a pressing block 511 for pushing the limit frame 507 to move toward the spring 508 can be fixedly connected to the end of the limit frame 507 away from the insert block 510. When the pressing block 511 is pushed to push the limit frame 507 to move toward the end of the spring 508, the slide rod 501 is relaxed, so that it loses its limit and slides inside the support rod 504; It is worth mentioning that before releasing the slide bar 501, when the limit frame 507 is against the wall, the distance between the limit frame 507 and the surface of the support rod 504 is the standard value of the wall flatness, and the movement data of the slide bar 501 is recorded based on this as the reference point; According to the above principle, the measured distance between the limit frame 507 and the surface of the support rod 504 is 0.5 mm, and the final measured wall flatness data is shown in the following table: 0.5 mm, and the final measured wall flatness data is shown in the following table:

[0020] Data analysis: According to the above table, it can be seen that the raised part of the wall accounts for a large proportion. Therefore, after the inspection is completed, the concave part of the wall can be repaired, so as to achieve the flatness of the wall while using less materials.

[0021] Data analysis: According to the above table, it can be seen that the concave part of the wall accounts for a large proportion. Therefore, after the inspection is completed, the protruding part of the wall can be removed and then polished to quickly complete the flattening of the wall.

[0022] Example 2: Please refer to Figure 4 , a device for measuring the flatness of wall surface construction of a building, which differs from Example 1 in that a plug rod 705 for limiting the push block 702 is slidably connected inside the support rod 504, and one end of the plug rod 705 close to the push block 702 is fixedly connected to the push plate 701, and a sliding groove is provided in the inner cavity of the support rod 504, and the plug rod 705 is slidably connected in the inner cavity of the sliding groove, so as to limit the push plate 701 and keep the push plate 701 and the support rod 504 always in a parallel state.

[0023] See also Figure 6 - Figure 7The adjustment component 2 includes a level meter 210, a level sensor is installed in the inner cavity of the level meter 210, the level meter 210 is fixedly installed on the side end of the outer wall of the main board 1, the bottom of the level meter 210 is rotatably connected to a flap 1 201, the flap 1 201 is rotatably connected to the bottom of the main board 1, the flap 1 201 is internally rotatably connected to a flap 2 202, the flap 202 is internally rotatably connected to a roller 2 203, and the end of the flap 1 201 away from the lever 4 is rotatably connected to a hydraulic rod 204 for pushing the flap 1 201 and the flap 2 202 to flip, specifically The bottom of the main board 1 is fixedly connected with a clamping block 205, and the inside of the clamping block 205 is fixedly connected with a support shaft 1. The flap 1 201 is sleeved on the outer wall of the support shaft 1 and moves in a fan shape around the support shaft 1; the flap 202 is fixedly connected with the support shaft 2, and the roller 203 is sleeved on the outer wall of the support shaft 2 and rotates around the support shaft 2; the outer wall of the flap 1 201 is rotatably connected with a special-shaped bent plate 206, and the inside of the special-shaped bent plate 206 is rotatably connected with a support shaft 3. The flap 1 201 and the flap 2 202 are both sleeved on the outer wall of the support shaft 3, and the hydraulic rod 204 is close to the flap One end of the plate 1 201 is fixedly connected to the outer wall of the special-shaped curved plate 206, and the end of the hydraulic rod 204 away from the special-shaped curved plate 206 is fixedly connected to the movable block 207, and the outer wall of the movable block 207 is rotatably connected to the clamping block 208, and the clamping block 208 is fixedly connected to the support shaft 4 inside. The movable block 207 is rotatably sleeved on the outer wall of the support shaft 4, so that when the hydraulic rod 204 is extended and contracted, the movable block 207 is driven to rotate around the support shaft 4 inside the clamping block 208; the bottom of the main board 1 is also fixedly connected to the clamping block 3 209, and the clamping block 3 209 is fixedly connected to the support shaft 4 inside. It is connected to a support shaft five, and a roller one 3 is sleeved on the outer wall of the support shaft five; when in use, the spirit level 210 can determine whether the main board 1 is in a horizontal state through the internally installed level sensor. When the main board 1 is tilted, the processing module installed inside the level sensor can drive the hydraulic rod 204 to extend and contract through the driving module, so that when the special-shaped bent plate 206 moves, the flap one 201 and the flap two 202 are pulled to flip, and the bottom height of the main board 1 is adjusted, so that after the main board 1 is adjusted to a horizontal state, the support rod 504 follows the main board 1 to be adjusted to a vertical state.

[0024] See also Figure 6 The outer wall of the push rod 4 is rotatably connected with a clamp block 401 for connecting with the main board 1, and a support shaft 6 is fixedly connected inside the clamp block 401. The push rod 4 is rotatably connected to the outer wall of the support shaft 6, and a pull plate 101 is fixedly connected to the top of the main board 1. The end of the clamp block 401 away from the push rod 4 is fixedly connected to the outer wall of the pull plate 101, and a rubber push block 402 for increasing friction is fixedly connected to the bottom of the push rod 4. The push rod 4 can be flipped and rotated around the support shaft 6 to make the rubber push block 402 abut against the ground to limit the position of the device.

[0025] Example 3: Please refer to Figure 8A device for measuring the flatness of a wall surface during construction of a house building is different from the embodiment 1 in that a rotating assembly 6 comprises a gear 601, an end of the gear 601 away from the main board 1 is fixedly connected to a support rod 504, a rack 602 is meshedly connected to the bottom of the gear 601, the rack 602 is rotatably connected to a pull rod 603 for pulling the rack 602 to move, a special-shaped groove is provided inside the main board 1, a motor 604 is fixedly installed inside the special-shaped groove, the output shaft of the motor 604 is rotatably connected to a rotating rod 605 that rotates around the output shaft of the motor 604, the rotating rod 605 is rotatably connected to the pull rod 603 through a connecting shaft 1, and the pull rod 603 and the rack 602 are rotatably connected through a connecting shaft 2 When the output shaft of the motor 604 drives the rotating rod 605 to rotate, the rotating rod 605 pulls the pull rod 603 to move in two sectors around the connecting axis, and at the same time pulls the rack 602 to move back and forth. Because the number of tooth blocks on the top of the rack 602 is the same as the number of tooth blocks on the outer wall of the gear 601, every time the rotating rod 605 rotates half a circle, the gear 601 can be pulled by the rack 602 to rotate 90°, so that the wall surface can be surveyed when the sliding rod 501 rotates. When the rotating rod 605 continues to rotate for the remaining half a circle, the pull rod 603 can push the rack 602 to move to the other side, so that the gear 601 rotates 180° in the opposite direction, so that the wall surface can be surveyed when the sliding rod 501 rotates.

[0026] See also Figure 8 The end of the support rod 504 away from the gear 601 is rotatably connected to a rubber block 506 for direct contact with the wall. The support rod 504 and the rubber block 506 are connected by a rotating shaft. Since the surface of the rubber block 506 is relatively soft, it can better fit the wall. At the same time, it avoids direct contact between the support rod 504 and the wall, reducing scratches caused by friction between the support rod 504 and the wall.

[0027] The working principle of the present invention is: the device is pushed to the wall, and the limit frame 507 is abutted against the wall surface, so that the support rod 504 is parallel to the wall surface, and the support rod 4 is turned over so that the rubber support block 402 is abutted against the ground, and the device is limited. Then turn on the level meter 210 to make the level sensor detect the angle of the main board 1. When the main board 1 is tilted, the processing module installed inside the level sensor can drive the hydraulic rod 204 to extend and contract through the driving module, so that when the special-shaped curved plate 206 moves, the flap 1 201 and the flap 202 are pulled to flip, and the height of the bottom end of the main board 1 is adjusted to facilitate adjusting the main board 1 to a horizontal state. At the same time, the support rod 504 follows the main board 1 to a vertical state; and by pressing the button 511, the button 511 pushes the plug through the limit frame 507 The block 510 is separated from the inside of the support rod 504, and the torsion spring 703 pulls the push plate 701 to push the slide rod 501 to move toward the wall. Because the wall is uneven, each group of push blocks 702 and spring 1 706 can independently push each group of corresponding slide rods 501 to move. When the scanning device 503 moves, the block 502 installed on the top of the inner cavity will move with it. When the support rods 504 installed inside the slide rod 501 are in contact with the wall, the scanning module can irradiate the number of moving blocks 502, so that the counting module installed inside the scanning module can record them. When the output shaft of the driving motor 604 drives the rotating rod 605 to rotate, the rotating rod 605 pulls the pull rod 603 to move around the connecting shaft in a fan shape, and at the same time pulls the rack 602 to move back and forth. When the rack 602 moves, the gear 601 at the top can drive the support rod 504 to rotate with its fan shape, thereby expanding the survey range of the sliding rod 501. During the flipping process, the sliding rod 501 can slide inside the support rod 504 following the concave and convex parts of the wall. At the same time, the scanning module can continuously irradiate the bar 502, so that the counting module installed inside the scanning module The data are recorded so that the display module can uniformly organize and play the collected data. At the same time, the counting module can record the distance between the end of the sliding rod 501 and the push block 702. The processed data is usually converted from an analog signal to a digital signal and is also displayed through the display module to facilitate the staff to view the calculated data. When the concave part of the wall is larger than the convex part, the convex part can be polished. Conversely, when the concave part of the wall is smaller than the convex part, the concave part can be filled to level the wall.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed in the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for measuring the flatness of a building wall surface, comprising a main board (1), characterized in that: A roller (3) is installed at the bottom of the main board (1); an adjusting component (2) for adjusting the angle of the main board (1) is installed at the bottom of the main board (1); an end of the adjusting component (2) away from the main board (1) is rotatably connected to a stopper (4) for limiting the position of the main board (1); an end of the main board (1) away from the stopper (4) is rotatably connected to a measuring component (5) for surveying the wall surface, and the concave and convex parts of the wall surface are recorded by the measuring component (5); a rotating component (6) for driving the measuring component (5) to expand the survey range is installed between the main board (1) and the measuring component (5); The measuring assembly (5) comprises a support rod (504), the support rod (504) being rotatably connected to an end of the main board (1) away from the support rod (4), a sliding rod (501) being slidably connected inside the support rod (504), a pushing assembly (7) for pushing the sliding rod (501) to move away from the main board (1) being installed at an end of the sliding rod (501) close to the main board (1), a bar (502) being fixedly installed at the top of the inner cavity of the sliding rod (501), and a scanning device (503) for counting the bars (502) being installed at the top of the bars (502).

2. A building construction wall surface flatness measuring device according to claim 1, characterized in that: The pushing assembly (7) comprises a pushing plate (701) which is slidably connected to the top of the main board (1); one end of the pushing plate (701) close to the sliding rod (501) is fixedly connected with a pushing block (702) for individually pushing each group of sliding rods (501) to move; the number of the pushing blocks (702) is the same as that of the support rod (504); and a torsion spring (703) for pulling the pushing plate (701) closer to the support rod (504) is installed in the inner cavity of the support rod (504).

3. A building construction wall surface flatness measuring device according to claim 1, characterized in that: A limit frame (507) for limiting the position of the slide rod (501) is slidably connected inside the support rod (504), and a second spring (508) for pushing the limit frame (507) to return to its original position is fixedly connected to the side end of the limit frame (507).

4. A building construction wall surface flatness measuring device according to claim 1, characterized in that: The support rod (504) is slidably connected inside with an insertion rod (705) for limiting the position of the push block (702), and one end of the insertion rod (705) close to the push block (702) is fixedly connected to the push plate (701).

5. A building construction wall surface flatness measuring device according to claim 1, characterized in that: The adjustment assembly (2) comprises a spirit level (210), the spirit level (210) being fixedly mounted on the outer wall of the main board (1), the bottom of the spirit level (210) being rotatably connected to a flap 1 (201), the interior of the flap 1 (201) being rotatably connected to a flap 2 (202), the interior of the flap 2 (202) being rotatably connected to a roller 2 (203), and the end of the flap 1 (201) away from the stop rod (4) being rotatably connected to a hydraulic rod (204) for pushing the flap 1 (201) and the flap 2 (202) to flip.

6. A building construction wall surface flatness measuring device according to claim 1, characterized in that: The outer wall of the push rod (4) is rotatably connected to a clamp block four (401) for connecting to the main board (1), and the bottom of the push rod (4) is fixedly connected to a rubber push block (402) for increasing friction.

7. A building construction wall surface flatness measuring device according to claim 1, characterized in that: The rotating assembly (6) comprises a gear (601), one end of the gear (601) away from the main board (1) is fixedly connected to the support rod (504), the bottom of the gear (601) is meshingly connected to a rack (602), and the rack (602) is rotatably connected to a pull rod (603) for pulling the rack (602) to move.

8. A building construction wall surface flatness measuring device according to claim 7, characterized in that: One end of the support rod (504) away from the gear (601) is rotatably connected to a rubber block (506) for direct contact with the wall.

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