Fence wall straightness detection equipment

Abstract

The invention relates to the technical field of wall body detection, and discloses and provides the following technical scheme that the fence wall body straightness detection equipment comprises a wall body; the detection and observation assembly is used for detecting the straightness of the wall body through visual laser; the positioning assembly is used for positioning the position of the detection and observation assembly; the detection and observation assembly comprises an observation device, a laser proofreading device and an imaging device. According to the fence wall straightness detection equipment, straightness detection of laser rays can be carried out on the wall through the arranged detection observation assembly, the laser rays are emitted out along the wall according to the straightness of the laser rays, when the wall is in a non-straight or concave-convex state, the laser rays can directly irradiate the wall, the length of the corresponding light rays on a reference object can be decreased, and the straightness of the laser rays can be detected. Therefore, laser detection on the straightness of the wall body is realized, laser detection is utilized, the overall detection efficiency is extremely high, repeated measurement on multiple directions of the wall body is not needed, and the complexity of wall body measurement is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wall detection, and particularly to a straightness detection device for a fence wall. Background Art

[0002] With the increasing living standards, people have an increasing demand for residential and office buildings. For the safety of daily communities or construction sites, people will set up a fence around the perimeter to play a protective role.

[0003] At present, after the construction of the fence wall, when it is necessary to detect the surface horizontal verticality, a horizontal measuring ruler is used for detection. The detection range is small, and the flatness of the wall surface in a certain area cannot be measured. Therefore, it is impossible to intuitively analyze the horizontal verticality of the entire wall through multi-point data in the same area. Relying solely on the inspectors to obtain data through multiple measurements not only has low detection accuracy, but also is time-consuming and laborious, reducing the detection efficiency. Therefore, a straightness detection device for a fence wall is proposed to solve the above problems. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a straightness detection device for a fence wall, which solves the problems of low efficiency and inability to intuitively and quickly detect the straightness and verticality of the fence wall in the prior art when detecting the straightness of the fence wall.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solution: A straightness detection device for a fence wall, including a wall; a detection and observation component for visually detecting the straightness of the wall with a laser; a positioning component for positioning the position of the detection and observation component; the detection and observation component includes an observation device, a laser alignment device, and an imaging device; the laser alignment device is used to emit laser light to irradiate and align the edge of the wall; the observation device is used to observe the path state of the emitted light in the laser alignment device; the imaging device is used to image the vertical offset degree of the wall; the positioning component includes a centering device and a moving device; the centering device is used to determine whether the detection and observation component is in a vertical state; the moving device is used to drive the overall up and down movement of the laser alignment device to detect the straightness of the upper and lower surfaces of the wall.

[0008] Preferably, the centering device includes a positioning frame. A ball sleeve is connected to the top of the positioning frame. A sphere is movably connected inside the ball sleeve. The lower surface of the sphere is connected to a centering cone through a connecting rod. The upper surface of the sphere is connected to a top cone through a connecting rod. A central rod is connected to the center position of the positioning frame. Three retractable support rods are connected to the lower surface of the positioning frame.

[0009] Preferably, the moving device includes a rotating sleeve. One end of the rotating sleeve is connected to a turntable. The other end of the rotating sleeve is connected to a driving wheel. The surface of the driving wheel is connected to a transmission wheel through a belt drive. A second pulley is connected to the inside of the transmission wheel through a shaft rod. The surface of the second pulley is in transmission connection with the first pulley through a toothed belt. The laser alignment device is arranged on the toothed belt.

[0010] Preferably, a side connecting rod is connected to the positioning frame. A support plate is slidably connected to the surface of the side connecting rod. Both the first pulley and the second pulley are rotatably connected to the support plate. A key shaft is arranged inside the transmission wheel. The key shaft is slidably connected to the transmission wheel through a key groove.

[0011] Preferably, a lead screw is rotatably connected inside the rotating sleeve. The lead screw is in threaded connection with the support plate. A rotating wheel is connected to one end of the lead screw located at the turntable.

[0012] Preferably, the observation device includes an observation tube. A lens and a reflector are sequentially arranged inside the observation tube. One end of the observation tube is connected to an intermediate tube through a corrugated expansion tube. An inclined lens is arranged inside the intermediate tube. A lens is connected to the front of the intermediate tube directly in front of the inclined lens.

[0013] Preferably, the laser alignment device includes a laser generator. The laser generator is connected to the lens through a connecting component. The light emitted by the laser generator forms a horizontal short straight line when irradiating on an object. The laser generator is installed on the toothed belt through a connecting piece. A reference object is arranged on one side of the wall.

[0014] Preferably, the imaging device includes a support plate. The connecting piece is connected to the support plate. A marker pen is installed on the support plate. The end face of the marker pen abuts against a display board. Two support sleeves are arranged on the back of the display board. The two support sleeves are respectively rotatably connected to the side connecting rod and the rotating sleeve.

[0015] Preferably, vertical scale lines and horizontal scale lines are arranged on the display board. When the marker pen moves up and down, a trace line will be left on the display board.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present invention provides a straightness detection device for a fence wall, having the following beneficial effects:

[0018] 1. The straightness detection device for the fence wall can achieve the straightness detection of the wall with laser light through the set detection and observation component. Relying on the flatness of the light, it shoots along the wall. When the wall is not straight or has concavities and convexities, the light will directly shine on the wall, and the corresponding light length on the reference object will become smaller, thus realizing the laser detection of the flatness of the wall. And with the use of laser detection, the overall detection efficiency is extremely high, without the need to repeatedly measure multiple directions of the wall, reducing the complexity of wall measurement.

[0019] 2. The straightness detection device for the fence wall can provide an intuitive line for the difference reference of flatness and perpendicularity through the set imaging device, so as to visually judge which part of the wall is uneven or not straight.

[0020] 3. The straightness detection device for the fence wall can achieve the up and down movement of the laser generator through the set moving device, so as to observe the flatness and perpendicularity of the whole wall up and down.

[0021] 4. The straightness detection device for the fence wall can determine whether the whole detection and observation component is in an inclined or vertical state when located on the ground through the set centering device, avoiding the situation that the later detection results are inaccurate due to the inclination of the detection and observation component itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a straightness detection device for a fence wall proposed by the present invention;

[0023] Figure 2 It is a schematic diagram of the connection structure of the detection and observation component and the positioning component of a straightness detection device for a fence wall proposed by the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the positioning component of a straightness detection device for a fence wall proposed by the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the moving device of a straightness detection device for a fence wall proposed by the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the observation device of a straightness detection device for a fence wall proposed by the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the imaging device of a straightness detection device for a fence wall proposed by the present invention;

[0028] Figure 7Schematic connection structure diagram of a laser generator and a lens of a straightness detection device for a fence wall proposed by the present invention.

[0029] In the figure: 1, wall; 2, detection and observation component; 201, observation tube; 202, lens; 203, reflector; 204, inclined lens; 205, intermediate tube; 206, corrugated expansion tube; 207, lens; 208, laser generator; 209, connecting piece; 210, support plate; 211, marking pen; 212, display board; 213, support sleeve; 3, positioning component; 301, positioning frame; 302, ball sleeve; 303, support rod; 304, centering cone; 305, top cone; 306, central rod; 307, side connecting rod; 308, rotating sleeve; 309, turntable; 310, runner; 311, lead screw; 312, sphere; 313, driving wheel; 314, transmission wheel; 315, support plate; 316, pulley one; 317, pulley two. Specific embodiments

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1-7 , a straightness detection device for a fence wall, comprising a wall 1; a detection and observation component 2 for visually detecting the straightness of the wall 1 by laser; a positioning component 3 for positioning the position of the detection and observation component 2; the detection and observation component 2 includes an observation device, a laser alignment device, and an imaging device; the laser alignment device is used to emit laser light to irradiate and align the edge of the wall 1; the observation device is used to observe the route state of the emitted light in the laser alignment device; the imaging device is used to image the vertical offset degree of the wall 1; the positioning component 3 includes a centering device and a moving device; the centering device is used to determine whether the detection and observation component 2 is in a vertical state; the moving device is used to drive the overall up and down movement of the laser alignment device to detect the straightness of the upper and lower surfaces of the wall 1.

[0032] In this embodiment, the centering device includes a positioning frame 301. A ball sleeve 302 is connected to the top of the positioning frame 301. A sphere 312 is movably connected inside the ball sleeve 302. The lower surface of the sphere 312 is connected to a centering cone 304 through a connecting rod. The upper surface of the sphere 312 is connected to a top cone 305 through a connecting rod. A center rod 306 is connected to the center position of the positioning frame 301. Three retractable support rods 303 are connected to the lower surface of the positioning frame 301. Considering that some ground surfaces are uneven, the centering device is provided. When the positioning frame 301 is located on the ground and in an inclined state, at this time, due to the gravitational force of the centering cone 304, the top cone 305 will not point to the bottom center position of the center rod 306. Because the centering cone 304 is affected by the gravitational force, it will always keep the center of gravity vertically downward. If the positioning frame 301 is inclined, the sphere 312 will rotate inside the ball sleeve 302 and will present a certain angle. So at this time, the top cone 305 will deviate from the inclined center rod 306. Only when the top of the top cone 305 aligns with the bottom center position of the center rod 306, the device will be in an absolutely vertical state with the ground at this time. Therefore, the operator can adjust the length of the support rod 303 according to the eccentric state, or perform the calibration of the laminated sheets.

[0033] Furthermore, the moving device includes a rotating sleeve 308. One end of the rotating sleeve 308 is connected to a turntable 309. The other end of the rotating sleeve 308 is connected to a driving wheel 313. The surface of the driving wheel 313 is connected to a transmission wheel 314 through a belt drive. The inside of the transmission wheel 314 is connected to a second pulley 317 through a shaft rod. The surface of the second pulley 317 is connected to a first pulley 316 through a toothed belt. The laser alignment device is arranged on the toothed belt. Manually rotate the turntable 309, which will drive the rotation of the rotating sleeve 308, and then drive the rotation of the driving wheel 313. The driving wheel 313 will drive the rotation of the transmission wheel 314 through the belt. At this time, the transmission wheel 314 drives the rotation of the second pulley 317 through the shaft rod, and then drives the rotation of the first pulley 316 through the transmission of the toothed belt. At this time, the toothed belt will present an up and down movement. The laser generator 208 is relatively fixedly connected to the toothed belt through a connecting member 209. At this time, the laser generator 208 will drive the lens 207 to perform synchronous up and down movement, so as to detect the upper and lower vertical surfaces of the wall 1.

[0034] Furthermore, a side link 307 is connected to the positioning frame 301. A support plate 315 is slidably connected to the surface of the side link 307. A first pulley 316 and a second pulley 317 are both rotatably connected to the support plate 315. A key shaft is provided inside the transmission wheel 314, and the key shaft is slidably connected to the transmission wheel 314 through a key groove. The main purpose of the side link 307 is to provide limit sliding when the support plate 315 moves horizontally. Through the provided key shaft, since the support plate 315 needs to drive the first pulley 316 and the second pulley 317 to move horizontally, and the position of the transmission wheel 314 is relatively unchanged, when the support plate 315 moves horizontally, the transmission wheel 314 will slide on the key shaft. By using the key groove type sliding, it can not only drive the rotation of the transmission wheel 314, but also control the horizontal movement of the key shaft without affecting the relative position of the transmission wheel 314.

[0035] In addition, a lead screw 311 is rotatably connected inside the rotating sleeve 308. The lead screw 311 is threadedly connected to the support plate 315. A runner 310 is connected to one end of the lead screw 311 located at the turntable 309. The operator can also adjust the overall horizontal movement of the entire detection and observation assembly 2. At this time, the runner 310 needs to be rotated to drive the support plate 315 to move horizontally through the threaded connection method. The horizontal movement of the support plate 315 will drive the entire toothed belt to move horizontally, and then drive the horizontal movement of the laser generator 208. Therefore, if the light length on the reference object changes, by rotating the lead screw 311, the horizontal movement of the laser generator 208 is driven to keep the irradiated light length consistent.

[0036] In addition, the observation device includes an observation tube 201. A lens 202 and a reflector 203 are sequentially arranged inside the observation tube 201. One end of the observation tube 201 is connected to an intermediate tube 205 through a corrugated expansion tube 206. An inclined lens 204 is arranged inside the intermediate tube 205. A lens 207 is connected in front of the inclined lens 204 on the intermediate tube 205. The operator can view from the position of the observation tube 201 through the eyes. By using the cooperative setting of the lens 202, multiple reflector lenses 203 and the inclined lens 204, the irradiation image of the lens 207 is reflected to the end face of the observation tube 201, providing remote magnification viewing for the operator, which is similar to the principle of a "periscope" as a whole.

[0037] It should be noted that the laser alignment device includes a laser generator 208. The laser generator 208 is connected to the lens 207 through a connecting component. The light emitted by the laser generator 208 forms a horizontal short straight line when irradiated on an object. The laser generator 208 is installed on the toothed belt through a connecting piece 209. A reference object is provided on one side of the wall 1. The lateral movement of the laser generator 208 will drive the marker pen 211 on the support plate 210 to move laterally through the connection of the connecting piece 209. Therefore, with the lateral and longitudinal movement of the laser generator 208, the marker pen 211 will draw a marker curve from top to bottom on the display board 212. After the inspector finishes the inspection from top to bottom, the inclination degree of the wall 1 can be directly and visually checked according to the marker curve on the display board 212.

[0038] It is worth mentioning that the imaging device includes a support plate 210. The connecting piece 209 is connected to the support plate 210. A marker pen 211 is installed on the support plate 210. The end face of the marker pen 211 abuts against a display board 212. Two support sleeves 213 are provided on the back of the display board 212. The two support sleeves 213 are respectively rotatably connected to the side connecting rod 307 and the rotating sleeve 308. Through the lateral movement adjustment of the laser generator 208, the lateral movement of the laser generator 208 will drive the marker pen 211 on the support plate 210 to move laterally through the connection of the connecting piece 209. Therefore, with the lateral and longitudinal movement of the laser generator 208, the marker pen 211 will draw a marker curve from top to bottom on the display board 212. After the inspector finishes the inspection from top to bottom, the inclination degree of the wall 1 can be directly and visually checked according to the marker curve on the display board 212.

[0039] In addition, vertical scale lines and horizontal scale lines are provided on the display board 212. The up and down movement of the marker pen 211 will leave a trace line on the display board 212. Through the provided longitudinal and horizontal scale lines, the size of the offset can be directly and visually checked from the trace line left by the marker pen 211, providing a parameter basis.

[0040] Working principle: First, the operator needs to lean the device against one side of the wall 1. If there is a reference object on the other side of the wall 1, there is no need to place a reference object. If there is no reference object, the operator only needs to vertically place a blank board on the other side of the wall 1. Generally, there is a corner wall on the other side of the wall 1, so it is also possible to use the corner wall as a reference object at this time. The purpose of setting the reference object is to enable the subsequent laser light to shine on the reference object for data comparison. Then, the operator turns on the retractable support rod 303 to make the entire device sit on the ground on one side of the wall 1. Since it is considered that some ground surfaces are uneven, a centering device is set. When the positioning frame 301 sits on the ground and is in an inclined state, at this time, due to the gravitational force of the centering cone 304, the top cone 305 will not point to the bottom center position of the central rod 306. Because the centering cone 304 is affected by gravity, it will always keep the center of gravity vertically downward. If the positioning frame 301 is inclined, the sphere 312 will rotate in the ball sleeve 302 and will present a certain angle. Therefore, at this time, the top cone 305 will deviate towards the inclined central rod 306. Only when the top of the top cone 305 aligns with the bottom center position of the central rod 306, the device will be in an absolutely vertical state with the ground. So the operator adjusts the support rod 303 according to the eccentric state for lamination calibration. Then, the device is started, and the laser generator 208 irradiates along the surface of the wall 1 onto the reference object. The light emitted by the laser generator 208 is not a dot-like light spot, but a horizontal light with a certain cross-sectional length, that is, when it shines on the reference object, it is not the existence of a point, but a short straight line. So when the laser light irradiates along the wall surface of the wall 1, the laser light will be mapped on the wall surface and shine on the reference object. If the wall surface is uneven, that is, not straight, for example, a part of the middle of the wall 1 protrudes, at this time, the laser light will directly shine on the convex surface position of the wall 1, and the subsequent wall surface will be blocked by the convex surface, and the light will not be mapped on the wall 1 in a straight line, but will be directly truncated at the convex surface position. Then, the light of the remaining width will shine on the reference object. If it is a concave surface, the light will be mapped on the straight wall surface 1, and the sunken position will also be truncated, but there will be no light in the sunken position. At this time, the operator can intuitively see the position where the light is truncated, and this is the sunken part of the wall 1.If the wall is in a gradually inclined state, a linear reflected light will also appear on the wall 1. At this time, the length of the light on the reference object will become shorter or longer. At this time, the operator can view from the position of the observation tube 201 with the eyes. By using the cooperation of the lens 202, multiple reflecting lenses 203 and the inclined lens 204, the irradiation image of the lens 207 is reflected to the end face of the observation tube 201, providing remote magnification viewing for the operator. The overall principle is similar to that of a "periscope". When the light irradiated by the laser generator 208 on the reference object is short, it means that the right end of the wall 1 is inclined outwards. If the light on the reference object is long, it means that the right end of the wall 1 is inclined inwards. The tester magnifies and views the light on the distant reference object at a fixed point through the light reflection principle of the lens 207. The lens 207 is similar to a telescope, which is convenient for the portable detection of the long wall 1. When it is necessary to detect the verticality of the upper and lower parts of the wall 1, the operator needs to manually rotate the turntable 309 at this time, which will drive the rotation of the rotating sleeve 308, and then drive the rotation of the driving wheel 313. The driving wheel 313 will drive the rotation of the driven wheel 314 through the belt. At this time, the driven wheel 314 drives the rotation of the second pulley 317 through the shaft rod, and then drives the rotation of the first pulley 316 through the transmission of the toothed belt. At this time, the toothed belt will move up and down. The toothed belt is fixedly connected to the laser generator 208 through the connecting piece 209. At this time, the laser generator 208 will move up and down synchronously with the lens 207, and the middle tube 205 will not move synchronously, thus stretching the corrugated telescopic tubes 206 at the upper and lower ends. If the middle tube 205 moves up, it will stretch the lower corrugated telescopic tube 206 and compress and fold the upper corrugated telescopic tube 206, and vice versa. Therefore, when the turntable 309 rotates at a constant speed, the laser generator 208 and the lens 207 will move up and down synchronously. Then the operator will move synchronously with the movement of the lens 207 through the observation tube 201, so as to directly observe the length of the light on the reference object, and judge the verticality state of the wall 1 according to the change of the light length.The operator can also control the overall lateral movement of the entire detection and observation component 2. At this time, the runner 310 needs to be rotated, which drives the support plate 315 to move laterally through the threaded connection method. The lateral movement of the support plate 315 will drive the entire toothed belt to move laterally, and then drive the lateral movement of the laser generator 208. Therefore, if the length of the light on the reference object changes, by rotating the lead screw 311, the lateral movement of the laser generator 208 is driven to keep the length of the irradiated light consistent. Then, continue to rotate the turntable 309 to control the downward movement of the laser generator 208. When the length of the light on the reference object is ensured to be consistent and the wall 1 is inclined, finally, the laser generator 208 will move horizontally left and right. The lateral movement of the laser generator 208 will drive the marker pen 211 on the support plate 210 to move laterally through the connection of the connecting piece 209. Therefore, with the lateral and longitudinal movement of the laser generator 208, the marker pen 211 will draw a marker curve from top to bottom on the display board 212. After the inspector finishes the inspection from top to bottom, the inclination degree of the wall 1 can be directly and visually checked according to the marker curve on the display board 212.

[0041] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

Claims

1. A straightness detection device for a fence wall, characterized in that including a wall body (1); a detection and observation component (2) for visually and laser detecting the straightness of the wall body (1); a positioning component (3) for positioning the position of the detection and observation component (2); the detection and observation component (2) includes an observation device, a laser alignment device and an imaging device; the laser alignment device is used for emitting laser light to irradiate and align the edge of the wall body (1); the observation device is used for observing the route state of the emitted light in the laser alignment device; the imaging device is used for imaging the vertical offset degree of the wall body (1); the positioning component (3) includes a centering device and a moving device; the centering device is used for determining whether the detection and observation component (2) is in a vertical state; the moving device is used for driving the whole laser alignment device to move up and down to detect the straightness of the upper and lower surfaces of the wall body (1).

2. The straightness detection device for a fence wall according to claim 1, wherein: the centering device includes a positioning frame (301), a ball sleeve (302) is connected to the top of the positioning frame (301), a sphere (312) is movably connected inside the ball sleeve (302), the lower surface of the sphere (312) is connected with a centering cone (304) through a connecting rod, the upper surface of the sphere (312) is connected with a top cone (305) through a connecting rod, a central rod (306) is connected to the center position of the positioning frame (301), and three retractable support rods (303) are connected to the lower surface of the positioning frame (301).

3. The straightness detection device for a fence wall according to claim 2, wherein: the moving device includes a rotating sleeve (308), a turntable (309) is connected to one end of the rotating sleeve (308), a driving wheel (313) is connected to the other end of the rotating sleeve (308), a transmission wheel (314) is connected to the surface of the driving wheel (313) through a belt drive, a second belt pulley (317) is connected to the inside of the transmission wheel (314) through a shaft rod, the surface of the second belt pulley (317) is in transmission connection with a first belt pulley (316) through a toothed belt, and the laser alignment device is arranged on the toothed belt.

4. The straightness detection device for a fence wall according to claim 3, characterized in that: a side connecting rod (307) is connected to the positioning frame (301), a support plate (315) is slidably connected to the surface of the side connecting rod (307), the first belt pulley (316) and the second belt pulley (317) are both rotatably connected to the support plate (315), a key shaft is arranged inside the transmission wheel (314), and the key shaft is slidably connected to the transmission wheel (314) through a key groove.

5. The straightness detection device for a fence wall according to claim 4, wherein: a lead screw (311) is rotatably connected to the inside of the rotating sleeve (308), the lead screw (311) is in threaded connection with the support plate (315), and a rotating wheel (310) is connected to one end of the lead screw (311) located at the turntable (309).

6. The straightness detection device for a fence wall according to claim 5, wherein: the observation device includes an observation tube (201), a lens (202) and a reflector (203) are sequentially arranged inside the observation tube (201), one end of the observation tube (201) is connected with an intermediate tube (205) through a corrugated expansion tube (206), an inclined lens (204) is arranged inside the intermediate tube (205), and a lens (207) is connected to the front of the inclined lens (204) on the intermediate tube (205).

7. The straightness detection device for a fence wall according to claim 6, wherein: The laser alignment device includes a laser generator (208), the laser generator (208) is connected to a lens (207) through a connecting member, the light emitted by the laser generator (208) irradiates on an object as a horizontal short straight line, the laser generator (208) is installed on a toothed belt through a connecting piece (209), and a reference object is arranged on one side of the wall body (1).

8. The straightness detection device for a fence wall according to claim 7, characterized in that: The imaging device includes a support plate (210), the connecting piece (209) is connected to the support plate (210), a marker pen (211) is installed on the support plate (210), the end face of the marker pen (211) abuts against a display board (212), and two support sleeves (213) are arranged on the back of the display board (212), and the two support sleeves (213) are respectively rotatably connected to a side connecting rod (307) and a rotating sleeve (308).

9. An apparatus for detecting the straightness of a fence wall according to claim 8, characterized in that: Vertical scale lines and horizontal scale lines are arranged on the display board (212), and the marker pen (211) moving up and down will leave a trace line on the display board (212).

Images