Marking device for building decoration engineering design

By designing a marking device that integrates a base, rectangular frame, and servo motor, the problems of inconvenience in carrying laser line markers and dust splashing are solved, enabling multi-functional use and a cleaner environment, and improving the service life and construction safety of laser line markers.

CN121803752APending Publication Date: 2026-04-07GUANGXI POLYTECHNIC VOCATIONAL & TECH SCHOOL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-06-16
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Existing laser line markers are inconvenient to carry, easily damaged, have limited functionality, and generate dust during drilling, which affects the environment and health.

Method used

A multifunctional marking device was designed, including a base, a rectangular frame, a servo motor, a material storage mechanism, and a collection mechanism. The height of the laser marking instrument can be adjusted by sliding the support frame, and it integrates drilling and spraying functions, while the material storage mechanism helps to reduce dust.

Benefits of technology

It enables safe portability and multi-functional use of laser line markers, reduces dust splashing, and improves service life and the cleanliness of the construction environment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a marking device for building decoration engineering design, which comprises a base, brake pulleys are slidably arranged at four corners of the top of the base, a rectangular frame is arranged at the tops of the four groups of brake pulleys, and second threaded rods are in threaded connection with two sides of the top of the rectangular frame. A mounting frame is arranged in the middle of the top of the base. The supporting frames slide in the mounting sliding grooves, the two supporting frames extend upwards to drive the laser line marking instrument to move out of the interior of the storage frame, the upward moving height of the laser line marking instrument can be controlled through the supporting frames, the height of the laser line marking instrument can be adjusted at will, and meanwhile after use, the laser line marking instrument can be conveniently stored. The supporting frame slides into the mounting sliding groove, meanwhile, the mounting frame is driven to move into the storage frame, storage of the laser line marking instrument is completed, the relative safety of the laser line marking instrument can be fully guaranteed, damage to the laser line marking instrument is reduced, and the service life of the laser line marking instrument is prolonged.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marking device, in particular to a marking device based on building decoration and renovation engineering design. BACKGROUND

[0002] Building decoration refers to the use of stone, wood and other building materials to build a kind of object for people to live and use, and the use of various materials to beautify and improve the external appearance or internal environment, so as to make it more emotional and have residential and commercial value. Before the design of building decoration, a laser line marker is often used to mark on the wall to facilitate the neatness of tiling or other decorative materials. The laser line marker is an instrument for correcting straightness, which uses a semiconductor pumped laser as a light source, and can emit a high collimation point light source after a group of lenses are combined and integrated, and can form a uniform light after being scattered by a special prism.

[0003] The current marking device has certain deficiencies:

[0004] 1. The existing laser line marker is directly installed on a tripod for use, but when carrying and storing the laser line marker, the tripod cannot be well stored, so it is inconvenient to carry. At the same time, the laser line marker is directly exposed to the outside, which makes the laser line marker vulnerable to external impact and easy to be damaged.

[0005] 2. At the same time, the existing marking device only has a single function. When drilling and marking a specific position, it is necessary to use multiple tools to drill and mark the required position, which is inconvenient. Some need to mark the required position by spraying paint.

[0006] 3. At the same time, when drilling, a large amount of debris will be generated, causing dust to fly everywhere. The flying dust will scatter in the surrounding environment, and the accumulation of dust will not only affect the surrounding environment, but also cause the construction personnel to inhale a large amount of dust, affecting the health of the construction personnel. SUMMARY

[0007] The purpose of the present application is to provide a marking device based on building decoration and renovation engineering design to solve the problems raised in the background.

[0008] In order to achieve the above object, the present application provides the following technical scheme: based on the building decoration engineering design with marking device, including base, the top of the base four corners is provided with brake pulley, four groups brake pulley top is provided with rectangular frame, the both sides of the top of the rectangular frame are threadedly connected with second threaded rod, the middle position of the top of the base is provided with mounting frame, the middle position of the top of the mounting frame is provided with receiving frame, the middle position of the inside top of the mounting frame is provided with servo motor, the output end of the servo motor is provided with rectangular rod, the outside top of the rectangular rod is provided with transmission sleeve, the outside top and bottom of the transmission sleeve are provided with connecting bearing and driving gear respectively, one side of the connecting bearing is provided with metal pull rod, the bottom of the rectangular rod is provided with drill head, both sides of the inside of the mounting frame are provided with storage mechanism, both ends of the mounting frame are provided with receiving mechanism.

[0009] Preferably, the storage mechanism includes storage bin, electromagnetic valve, flow guide plate, water outlet pipe, fixed plate, driven gear, internal thread sleeve, piston and first threaded rod, the two sides of the storage bin are located inside the mounting frame, the bottom of the two groups of storage bins is provided with water outlet pipe, the bottom of the two groups of water outlet pipes is provided with flow guide plate, the top of the outside of the two groups of water outlet pipes is provided with electromagnetic valve, the top of the two groups of fixed plates is located inside the mounting frame, the inside of the two groups of fixed plates is rotatably provided with internal thread sleeve, the bottom of the outside of the internal thread sleeve is provided with driven gear, the inside of the internal thread sleeve is threadedly connected with first threaded rod, the bottom of the first threaded rod is provided with piston.

[0010] Preferably, the receiving mechanism includes mounting sliding groove, mounting bracket, laser line instrument, support plate, baffle, through groove, support frame and first rack, the top of the two groups of mounting sliding grooves is located at both ends of the mounting frame, the inside of the mounting sliding groove is slidably provided with support frame, the inside of the two groups of support frames is provided with through groove, the two ends of the side of the two groups of support frames away from each other are provided with first rack, the top of the inside of the support frame is slidably provided with baffle, the top of the side of the two groups of support frames close to each other is rotatably provided with support plate, the bottom of the support plate is provided with mounting bracket, the bottom of the mounting bracket is provided with laser line instrument, the top of the side of the inside of the mounting sliding groove close to each other is provided with locking mechanism.

[0011] Preferably, the locking mechanism includes mounting sleeve, clamping plate, connecting spring, clamping plate and second rack, the top of the side of the mounting sleeve is located at the side of the mounting sliding groove, one side of the inside of the mounting sleeve is provided with connecting spring, one side of the connecting spring is provided with telescopic rod, one side of the telescopic rod is provided with clamping plate, the two ends of the side of the clamping plate close to the mounting sleeve are provided with second rack.

[0012] Preferably, one side of the mounting sleeve penetrates the inside of the through slot, and the mounting sleeve and the through slot slide relative to each other.

[0013] Preferably, the second rack is opposite the toothed surface of the first rack, and the second rack and the first rack are engaged with each other.

[0014] Preferably, the two groups of fixing plates and driven gears are located at different levels, and the two groups of driven gears are engaged with the driving gear.

[0015] Preferably, one side of the mounting frame is provided with a vertical slot, the metal pull rod slides in the inside of the vertical slot, and the top and bottom of the vertical slot are provided with magnets.

[0016] Preferably, the bottom of the outside of the second threaded rod is provided with a bearing, and the bottom of the bearing is connected with the top of the base.

[0017] Preferably, a large number of water outlet holes are distributed on the bottom of the guide plate, and a circular hole is arranged at the middle position in the inside of the guide plate.

[0018] Compared with the prior art, the present application provides a marking device based on building decoration engineering design, which has the following advantages:

[0019] 1、The support frame slides in the inside of the installation sliding groove, so that the support frame can extend from the inside of the installation sliding groove, and the two groups of support frames extending upwards can drive the laser line instrument to move out of the inside of the storage frame, the height of the laser line instrument moving upwards can be controlled by the support frame, when the support frame drives the laser line instrument to move to the appropriate position, the support frame is fixed by the engagement of the two groups of second racks on the installation sleeve and the two groups of first racks on the support frame, the height of the laser line instrument can be adjusted at will, after use, the support frame is slid into the inside of the installation sliding groove, and the mounting frame is driven to move into the inside of the storage frame, the laser line instrument is stored, the relative safety of the laser line instrument can be fully ensured, the damage of the laser line instrument is reduced, and the service life of the laser line instrument is improved.

[0020] 2. This invention utilizes a storage bin and a drill head located inside the mounting frame. When drilling is required at a specific location, a servo motor drives the rectangular rod and the drill head to rotate simultaneously. This high-speed rotation of the drill head, along with the simultaneous rotation of two sets of second threaded rods, causes the rectangular frame to move upwards due to the threading action. The rectangular frame then drives four sets of brake pulleys upwards, causing the drill head to move downwards relative to the ground for drilling. Simultaneously, the driving gear meshes with the driven gear on the right, causing the piston to move downwards. This forces the coating inside the driven gear to be squeezed into the water outlet pipe and then sprayed through holes in the guide plate to mark the desired location. This enhances the functionality of the device and makes the marking device more practical.

[0021] 3. This invention incorporates a storage mechanism inside the mounting frame, allowing one set of storage bins to be filled with water. When the drill bit is drilling into the ground, the drive gear can be moved to the same height as the driven gear on the left, causing them to mesh. Simultaneously, as the drill bit drills, it rotates the driven gear on the left, causing the first threaded rod on the left to move the piston on the left downwards. This moves the water inside the storage bins, along with the solenoid valve and water outlet pipe, to the interior of the guide plate. The water is then sprayed out through the water outlet holes inside the guide plate, reducing dust around the drill bit and minimizing its spread into the surrounding environment, thus ensuring a clean drilling environment. Attached Figure Description

[0022] Figure 1 This is a front sectional view of the present invention;

[0023] Figure 2 This is a top sectional view of the mounting frame of the present invention;

[0024] Figure 3 This is a front sectional view of the mounting frame of the present invention;

[0025] Figure 4 This is a side view of the mounting frame of the present invention;

[0026] Figure 5 This is a schematic diagram of the locking mechanism of the present invention.

[0027] In the diagram: 1. Base; 2. Storage mechanism; 201. Storage bin; 202. Solenoid valve; 203. Guide plate; 204. Water outlet pipe; 205. Fixing plate; 206. Driven gear; 207. Internal threaded sleeve; 208. Piston; 209. First threaded rod; 3. Storage mechanism; 301. Mounting slide; 302. Mounting bracket; 303. Laser marker; 304. Support plate; 305. Baffle; 306. Through groove; 307. 1. Support frame; 308. First rack; 4. Locking mechanism; 401. Mounting sleeve; 402. Telescopic rod; 403. Connecting spring; 404. Clamping plate; 405. Second rack; 5. Brake pulley; 6. Drill head; 7. Rectangular frame; 8. Drive gear; 9. Metal tie rod; 10. Servo motor; 11. Connecting bearing; 12. Rectangular rod; 13. Transmission sleeve; 14. Mounting frame; 15. Storage frame; 16. Second threaded rod. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-5 The present invention provides a technical solution: a marking device for architectural decoration and renovation engineering design, comprising a base 1, brake pulleys 5 slidably arranged at the four corners of the top of the base 1, a rectangular frame 7 arranged at the top of the four sets of brake pulleys 5, a second threaded rod 16 threadedly connected to the two sides of the top of the rectangular frame 7, an installation frame 14 arranged at the middle position of the top of the base 1, a storage frame 15 arranged at the middle position of the top of the installation frame 14, a servo motor 10 arranged at the middle position of the top inside the installation frame 14, a rectangular rod 12 arranged at the output end of the servo motor 10, a transmission sleeve 13 sleeved on the top of the outer side of the rectangular rod 12, a connecting bearing 11 and a drive gear 8 respectively arranged at the top and bottom of the outer side of the transmission sleeve 13, a metal pull rod 9 arranged on one side of the connecting bearing 11, a drill head 6 arranged at the bottom of the rectangular rod 12, a material storage mechanism 2 arranged on both sides inside the installation frame 14, and a storage mechanism 3 arranged at both ends of the installation frame 14.

[0030] As a preferred embodiment, the storage mechanism 2 includes a storage bin 201, a solenoid valve 202, a guide plate 203, a water outlet pipe 204, a fixing plate 205, a driven gear 206, an internally threaded sleeve 207, a piston 208, and a first threaded rod 209. The storage bin 201 has two sides located inside the mounting frame 14. Water outlet pipes 204 are located at the bottom of the two sets of storage bins 201, and guide plates 203 are located at the bottom of the two sets of water outlet pipes 204. A solenoid valve 202 is provided on the top of the outer side of the 4. The fixing plate 205 is provided with two sets of tops located on both sides inside the mounting frame 14. The two sets of fixing plates 205 are rotatably provided with internal threaded sleeves 207. A driven gear 206 is provided on the bottom of the outer side of the internal threaded sleeve 207. The internal thread of the internal threaded sleeve 207 is connected to a first threaded rod 209. A piston 208 is provided at the bottom of the first threaded rod 209, so that the device can perform spray marking and dust reduction during drilling.

[0031] As a preferred embodiment, the storage mechanism 3 includes a mounting slide 301, a mounting frame 302, a laser marker 303, a support plate 304, a baffle 305, a through groove 306, a support frame 307, and a first rack 308. The mounting slide 301 has two sets of tops located at both ends of the mounting frame 14. The support frame 307 is slidably arranged inside the mounting slide 301. The through groove 306 is opened inside the two sets of support frames 307. The first rack 308 is arranged at both ends of the two sets of support frames 307 on the side away from each other. The baffle 305 is slidably arranged at the top inside the support frame 307. The support plate 304 is rotatably arranged at the top of the two sets of support frames 307 on the side close to each other. The mounting frame 302 is arranged at the bottom of the support plate 304. The laser marker 303 is arranged at the bottom of the mounting frame 302. The locking mechanism 4 is arranged at the top of the two sets of support frames 301 on the side close to each other, which can adjust the height of the laser marker 303 and store it.

[0032] As a preferred embodiment, the locking mechanism 4 includes a mounting sleeve 401, a locking plate 404, a connecting spring 403, a locking plate 404, and a second rack 405. The mounting sleeve 401 is located at the top of one side of the mounting groove 301. A connecting spring 403 is provided on one side inside the mounting sleeve 401. A telescopic rod 402 is provided on one side of the connecting spring 403. A locking plate 404 is provided on one side of the telescopic rod 402. The second rack 405 is provided at both ends of the locking plate 404 near the mounting sleeve 401, which can fix and lock the support frame 307.

[0033] As a preferred embodiment, one side of the mounting sleeve 401 extends through the interior of the through groove 306, and the mounting sleeve 401 and the through groove 306 slide against each other, making the movement of the support frame 307 more stable.

[0034] As a preferred embodiment, the tooth surfaces of the second rack 405 and the first rack 308 are opposite each other, and the second rack 405 and the first rack 308 mesh with each other, so that the support frame 307 can be fixed at any time.

[0035] As a preferred embodiment, the two sets of fixed plates 205 and driven gears 206 are located at different horizontal heights, and both sets of driven gears 206 mesh with the driving gear 8.

[0036] As a preferred embodiment, a vertical groove is provided on one side of the mounting frame 14, the metal pull rod 9 slides inside the vertical groove, and magnets are provided at the top and bottom of the vertical groove so that the metal pull rod 9 can be fixed.

[0037] As a preferred embodiment, a bearing is provided at the bottom of the outer side of the second threaded rod 16, and the bottom of the bearing is connected to the top of the base 1, which enables the second threaded rod 16 to rotate stably.

[0038] As a preferred embodiment, the bottom of the guide plate 203 is provided with a large number of water outlet holes, and a round hole is provided in the middle position inside the guide plate 203, which can make the water flow out evenly.

[0039] Example 1, such as Figures 1-5 As shown, when it is necessary to spray markings on the ground, the meshing state between the drive gear 8 and the driven gear 206 needs to be changed. The metal lever 9 is pushed down, causing the connecting bearing 11 and the transmission sleeve 13 to slide down on the outside of the rectangular rod 12. The drive gear 8 is driven to mesh with the driven gear 206 on the right side through the transmission sleeve 13. At this time, the servo motor 10 is turned on, and the drive gear 8 is driven to rotate through the transmission sleeve 13, thereby causing the driven gear 206 and the internal threaded sleeve 207 to rotate. The paint inside the storage bin 201 on the right side can be squeezed out by the piston 208 and sprayed out through the water outlet on the guide plate 203.

[0040] Example 2, as Figures 3-4As shown, when the laser marking device 303 needs to be stored, the two sets of baffles 305 are pulled out from inside the support frame 307, the support plate 304 is rotated 180 degrees, and the baffles 305 are reinserted into the support frame 307. At this time, the two sets of clamping plates 404 are pulled away from the mounting sleeve 401, so that the second rack 405 on the clamping plate 404 contacts and meshes with the first rack 308. At this time, the two sets of support frames 307 are released from fixation, and the support frame 307 is moved downward. Through the support plate 304, the mounting frame 302 and the laser marking device 303 are moved into the storage frame 15. At this time, the two sets of clamping plates 404 are released. Under the tension of the connecting spring 403, the clamping plates 404 are reset, causing the second rack 405 to mesh with the first rack 308, fixing the two sets of support frames 307, and completing the storage.

[0041] Working principle: First, sufficient water and paint are added to the inside of the storage bins 201 respectively. Water is added to the left storage bin 201, and paint is added to the right storage bin 201. When drilling is required on the ground, the metal lever 9 is moved to cause the connecting bearing 11 and the transmission sleeve 13 to slide on the outside of the rectangular rod 12, thereby adjusting the height of the drive gear 8 so that the drive gear 8 is at the same height as the driven gear 206 on the left. The drive gear 8 and the driven gear 206 on the left mesh. At this time, the servo motor 10 is turned on to drive the rectangular rod 12 to rotate. The rectangular rod 12 drives the drive gear 8 to rotate through the transmission sleeve 13, and the drive gear 8 drives the driven gear 206 to rotate. Driven gear 206 drives internal threaded sleeve 207 to rotate, causing first threaded rod 209 to move downward. As a result, piston 208 moves downward inside storage bin 201 along with first threaded rod 209, causing water inside storage bin 201 to be squeezed into guide plate 203 and then sprayed around drill head 6 through water outlet holes on guide plate 203. At this time, the two sets of second threaded rods 16 are rotated, causing the two sets of rectangular frames 7 to move upward outside the second threaded rods 16, thereby causing brake pulley 5 to move upward inside base 1, causing base 1 to move downward as a whole, so that drill head 6 gradually comes into contact with the ground to drill, but brake pulley 5 will always be in contact with the ground to ensure the stability of the device.

[0042] When the laser marking device 303 is needed, pull the two sets of clamping plates 404 away from the mounting sleeve 401, so that the second rack 405 on the clamping plate 404 engages with the first rack 308. At this time, the two sets of support frames 307 are released from fixation. Pull the support frames 307 upward, and the mounting frame 302 and the laser marking device 303 will move out of the storage frame 15 through the support plate 304. When the support frame 307 is moved to the appropriate position, the two sets of clamping plates 404 are then... 4. Release the spring 403, causing the clamping plate 404 to reset, which in turn causes the second rack 405 to mesh with the first rack 308, fixing the two sets of support frames 307. Then, pull the two sets of baffles 305 out of the support frame 307, rotate the support plate 304 180 degrees so that the laser marking instrument 303 is placed upwards, and then reinsert the baffles 305 into the support frame 307 so that the two sets of baffles 305 limit and support the support plate 304.

[0043] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A marking device for architectural decoration and renovation engineering design, comprising a base (1), characterized in that: Brake pulleys (5) are slidably arranged at the four corners of the top of the base (1). A rectangular frame (7) is provided on the top of the four sets of brake pulleys (5). The two sides of the top of the rectangular frame (7) are threadedly connected to the second threaded rods (16). An installation frame (14) is provided at the middle position of the top of the base (1). A storage frame (15) is provided at the middle position of the top of the installation frame (14). A servo motor (10) is provided at the middle position of the top inside the installation frame (14). The servo motor (10) has... A rectangular rod (12) is provided at the output end. A transmission sleeve (13) is sleeved on the top of the outer side of the rectangular rod (12). A connecting bearing (11) and a drive gear (8) are respectively provided on the top and bottom of the outer side of the transmission sleeve (13). A metal pull rod (9) is provided on one side of the connecting bearing (11). A drill bit (6) is provided at the bottom of the rectangular rod (12). A material storage mechanism (2) is provided on both sides inside the mounting frame (14). A storage mechanism (3) is provided at both ends of the mounting frame (14).

2. The marking device for architectural decoration and renovation engineering design according to claim 1, characterized in that: The storage mechanism (2) includes a storage bin (201), a solenoid valve (202), a guide plate (203), a water outlet pipe (204), a fixed plate (205), a driven gear (206), an internal threaded sleeve (207), a piston (208), and a first threaded rod (209). The storage bin (201) has two sides located inside the mounting frame (14). The bottom of the two sets of storage bins (201) is provided with a water outlet pipe (204), and the bottom of the two sets of water outlet pipes (204) is provided with a guide plate (203). Solenoid valves (202) are provided on the top of the two sets of water outlet pipes (204) on the outside. The fixing plate (205) is provided with two sets of tops located on both sides inside the mounting frame (14). The two sets of fixing plates (205) are rotatably provided with internal threaded sleeves (207). A driven gear (206) is provided on the bottom of the outer side of the internal threaded sleeve (207). The internal thread of the internal threaded sleeve (207) is connected to a first threaded rod (209). A piston (208) is provided at the bottom of the first threaded rod (209).

3. The marking device for architectural decoration and renovation engineering design according to claim 1, characterized in that: The storage mechanism (3) includes a mounting slide (301), a mounting bracket (302), a laser marker (303), a support plate (304), a baffle (305), a through groove (306), a support frame (307), and a first rack (308). The mounting slide (301) has two sets of supports located at the top of both ends of the mounting frame (14). The support frame (307) is slidably arranged inside the mounting slide (301). The two sets of support frames (307) have through grooves (306) inside them. The support frame (307) has a first rack (308) at both ends on the opposite side. A baffle (305) is slidably provided on the top inside the support frame (307). A support plate (304) is rotatably provided on the top of the two sets of support frames (307) on the opposite side. A mounting frame (302) is provided at the bottom of the support plate (304). A laser marking instrument (303) is provided at the bottom of the mounting frame (302). A locking mechanism (4) is provided on the top of the mounting groove (301) on the opposite side.

4. The marking device for architectural decoration and renovation engineering design according to claim 3, characterized in that: The locking mechanism (4) includes a mounting sleeve (401), a locking plate (404), a connecting spring (403), a locking plate (404), and a second rack (405). The mounting sleeve (401) is located at the top of one side of the mounting groove (301). A connecting spring (403) is provided on one side inside the mounting sleeve (401). A telescopic rod (402) is provided on one side of the connecting spring (403). A locking plate (404) is provided on one side of the telescopic rod (402). A second rack (405) is provided at both ends of the locking plate (404) near the mounting sleeve (401).

5. The marking device for architectural decoration and renovation engineering design according to claim 4, characterized in that: One side of the mounting sleeve (401) penetrates the interior of the through groove (306), and the mounting sleeve (401) and the through groove (306) slide against each other.

6. The marking device for architectural decoration and renovation engineering design according to claim 4, characterized in that: The tooth surfaces of the second rack (405) and the first rack (308) are opposite each other, and the second rack (405) and the first rack (308) mesh with each other.

7. The marking device for architectural decoration and renovation engineering design according to claim 2, characterized in that: The two sets of fixed plates (205) and driven gears (206) are located at different horizontal heights, and both sets of driven gears (206) mesh with the driving gear (8).

8. The marking device for architectural decoration and renovation engineering design according to claim 1, characterized in that: A vertical groove is provided on one side of the mounting frame (14), the metal pull rod (9) slides inside the vertical groove, and magnets are provided at the top and bottom of the vertical groove.

9. The marking device for architectural decoration and renovation engineering design according to claim 1, characterized in that: The bottom of the outer side of the second threaded rod (16) is provided with a bearing, and the bottom of the bearing is connected to the top of the base (1).

10. The marking device for architectural decoration and renovation engineering design according to claim 2, characterized in that: The bottom of the guide plate (203) is provided with a large number of water outlet holes, and a round hole is provided in the middle position inside the guide plate (203).