Laser positioning pay-off instrument device capable of being adjusted in lifting mode

By designing a laser positioning and setting-off device that can be lifted and lowered, the problem of frequently adjusting the height of the laser during the setting-out process at the construction site is solved, improving work efficiency and accuracy, and reducing construction risks and labor consumption.

CN222393569UActive Publication Date: 2025-01-24CHINA RAILWAY NO 3 GRP CO LTD +1
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Patent Information

Application Number
CN202420884329.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-25
Publication Date
2025-01-24
Estimated Expiration
2034-04-25

AI Technical Summary

Technical Problem

At the construction site, the line release process requires frequent adjustment of the height of the laser instrument, which is time-consuming and labor-intensive, inconvenient to operate and easy to produce errors, increasing construction safety hazards and workload.

Method used

Designed a kind of lifting and adjusting the laser positioning set instrument device, including scale ruler, positioning board, laser bracket, supporting frame, and level positioning of air bubbles. Flexible movement and precise positioning.

Benefits of technology

This device improves the efficiency and accuracy of the launch work, reduces construction time and labor, reduces operating errors and safety hazards, and is suitable for the launch tasks of various construction projects.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a laser positioning pay-off instrument device capable of being adjusted in a lifting mode, and belongs to the technical field of axis positioning of constructional engineering. The laser positioning pay-off instrument device capable of being adjusted in a lifting mode comprises a graduated scale, a positioning plate, a laser instrument support, a supporting frame and a level positioning bubble, the positioning plate is installed on the graduated scale, the laser instrument support is installed on the graduated scale, the graduated scale is installed on the supporting frame, and the laser instrument support is installed on the supporting frame. The level positioning bubble is installed on the supporting frame, and the height of the positioning plate and the height of the laser instrument support can be adjusted. The utility model has the advantages of flexibility, convenience, time saving, labor saving, efficiency improvement, quality guarantee and the like.
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Description

Technical Field

[0001] The utility model relates to the technical field of axis positioning of construction projects, and in particular to a laser positioning and laying-out instrument device capable of lifting and lowering and adjusting. Background Art

[0002] The main project and decoration project layout is based on the building axis (civil engineering reference line) and elevation. The control line that guides the entire construction process according to the design plan layout and space requirements is the positioning line of the decoration control. At the construction site, the contents marked on the drawings are accurately and meticulously laid out on the ground, walls, and top surfaces at a 1:1 ratio. And according to the materials and measurement data shown in the drawings, they are marked, marked, and drawn to check whether the construction site has conflicts with other processes or cannot meet the construction drawings. This is a further test of the design work and a review standard for each process in construction. Due to the space error, pipeline restrictions, or design omissions at the construction site, the layout process must be done and is extremely important.

[0003] Laser marking work needs to be based on a certain reference line (reference object). Every time a marking point is changed, the laser instrument needs to be set up again according to the reference line, which is time-consuming and laborious. In addition, when marking high places such as the main and secondary beams of the main structure, the internal and external walls of the masonry project, the ceiling of the decoration project, the keel, and the gypsum board, it is necessary to step on a ladder to confirm the height of the ceiling, which increases the safety hazards of construction and reduces work efficiency. In particular, the operator needs to use a ruler to constantly adjust the height, which is prone to errors during the adjustment process and increases the workload of the operator. Utility Model Content

[0004] In order to solve the above technical problems, the utility model proposes a laser positioning and laying-out instrument device which can be raised and lowered and adjusted.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A laser positioning and laying-out device that can be raised and lowered and adjusted comprises a scale, a positioning plate, a laser instrument bracket, a support frame and a level positioning bubble, wherein the positioning plate is mounted on the scale, the laser instrument bracket is mounted on the scale, the scale is mounted on the support frame, the level positioning bubble is mounted on the support frame, and the positioning plate and the laser instrument bracket are both arranged to be height-adjustable.

[0007] Furthermore, the gradable ruler includes an outer ruler body and an inner ruler body, the bottom end of the inner ruler body can be lifted and inserted into the interior of the outer ruler body, and both the inner ruler body and the outer ruler body are cylindrical structures, and a ruler positioning component is provided between the inner ruler body and the outer ruler body for fixing the inner ruler body at different heights on the outer ruler body.

[0008] Furthermore, the ruler positioning component includes a ruler body through groove, a ruler body pressure block and a ruler body top screw, wherein the ruler body through groove is opened on one side of the outer ruler body, and the top end of the ruler body through groove passes through the top end of the outer ruler body, the inner end of the ruler body top screw passes through the ruler body through groove and is rotatably installed on the inner ruler body, the ruler body pressure block is threadedly sleeved on the outside of the ruler body top screw, and the ruler body pressure block has an arc structure adapted to the surface of the outer ruler body.

[0009] Furthermore, the positioning plate and the laser instrument bracket both include a lifting sleeve component, wherein the lifting sleeve component includes a sliding sleeve, a first side top screw, a second side top screw and a top screw pressing block, the first side top screw and the second side top screw are both threadedly installed on the sliding sleeve, the first side top screw and the second side top screw are symmetrically distributed, the inner diameter of the sliding sleeve is adapted to the outer diameter of the outer scale body, the top screw pressing block is rotatably installed on the outside of the first side top screw, the top screw pressing block is arranged to be an arc structure adapted to the surface of the inner scale body, the top screw pressing block is located between the inner scale body and the sliding sleeve, and the top screw pressing block is arranged to be adapted to the width of the scale body through groove and aligned with the scale body through groove.

[0010] Furthermore, a scale body strip groove aligned with the scale body through groove is opened on the surface of the inner scale body, and the inner end of the first side top screw passes through the top screw pressing block and is inserted into the scale body strip groove.

[0011] Furthermore, the positioning plate includes an annular plate fixedly arranged on the top of the sliding sleeve, and the inner diameter of the sliding plate is arranged to match the outer diameter of the outer scale body, an annular groove is provided on the upper surface of the annular plate, and a limiting circular plate matching the size of the annular groove is arranged on the top of the inner scale body.

[0012] Further, the laser instrument bracket includes a base plate, a slide plate and a fine-tuning bolt, wherein the base plate includes a first plate body portion, a second plate body portion vertically arranged in the middle of one side of the first plate body portion and a sleeve hole opened on the second plate body portion, and the inner diameter of the sleeve hole is adapted to the outer diameter of the outer ruler body, the second plate body portion is installed on the top end of the sliding sleeve, the slide plate includes a third plate body portion and a fourth plate body portion vertically arranged at the bottom end of the outer side surface of the third plate body portion, the fourth plate body portion is used to install a laser positioning and laying-out instrument, the third plate body portion is slidably installed on the outer side surface of the first plate body portion in the height direction, the fine-tuning bolt is longitudinally arranged and rotatably installed on the third plate body portion, and the fine-tuning bolt is threadedly connected to the first plate body portion.

[0013] Furthermore, a slider is provided on the inner side surface of the third plate body, and a slide groove is provided on the outer side of the first plate body. The slider is slidably arranged in the slide groove. Limiting plates are provided on the upper and lower sides of the inner side surface of the third plate body. The slider is located between the two limiting plates, and the two ends of the fine-tuning bolt are respectively rotatably installed on the two limiting plates.

[0014] Furthermore, the support frame includes a support plate sleeved on the bottom end of the outer ruler body and a plurality of adjusting bolts threadedly penetrated through the support plate and distributed symmetrically in the center.

[0015] The utility model has the following beneficial effects:

[0016] The use of the adjustable laser positioning and laying-out instrument facilitates the laying-out of each sub-project, improves work efficiency, saves time and effort, and can move the laser instrument at any time to adjust the lifting height to lay out the height of any part, which can effectively solve the problems of time-consuming and labor-intensive, inconvenient operation, and the need to constantly confirm and adjust the height. It has the advantages of flexibility, convenience, time-saving and labor-saving, improving efficiency, and ensuring quality. It can be used in the installation and laying-out of templates for main projects, the installation and laying-out of ceiling keels and gypsum boards for decoration and renovation projects, the horizontal positioning of floor tiles, and the height positioning of wall skirt installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model of a laser positioning and laying-out instrument device capable of being raised and lowered and adjusted;

[0018] Figure 2 This utility model Figure 1 A in the enlarged view;

[0019] Figure 3 This utility model Figure 1 Another perspective of the laser positioning and setting-off device that can be raised and lowered;

[0020] Figure 4 This utility model Figure 3 The enlarged view of point B in the figure;

[0021] Figure 5 This utility model Figure 3 The enlarged view of point C in the figure;

[0022] Figure 6 It is a schematic diagram of the scale of the utility model;

[0023] Figure 7 It is a schematic diagram of the lifting sleeve component of the utility model;

[0024] Figure 8 It is a disassembled schematic diagram of the laser instrument bracket of the utility model.

[0025] In the figure: 1. scale; 1.1. outer scale body; 1.2. inner scale body; 2. positioning plate; 2.1. ring plate; 2.2. annular groove; 3. laser instrument bracket; 3.1. fine-tuning bolt; 3.2. first plate body; 3.3. second plate body; 3.4. sleeve hole; 3.5. third plate body; 3.6. fourth plate body; 4. support frame; 4.1. support plate; 4.2. adjusting bolt; 5. level positioning bubble; 6. ruler positioning component; 6.1. ruler body through groove; 6.2. ruler body pressure block; 6.3. ruler body top screw; 7. lifting sleeve component; 7.1. sliding sleeve; 7.2. first side top screw; 7.3. second side top screw; 7.4. top screw pressure block; 8. ruler body strip groove; 9. limiting circular plate; 10. slider; 11. slide groove; 12. limiting plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. 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.

[0027] Reference Figures 1 to 8 As shown, a laser positioning and laying-out device that can be raised and lowered and adjusted includes a scale 1, a positioning plate 2, a laser instrument bracket 3, a support frame 4 and a level positioning bubble 5. The positioning plate 2 is installed on the scale 1, the laser instrument bracket 3 is installed on the scale 1, the scale 1 is installed on the support frame 4, and the level positioning bubble 5 is installed on the support frame 4. The level positioning bubble 5 can ensure the verticality of the scale 1 to ensure the accuracy of the instrument, and the positioning plate 2 and the laser instrument bracket 3 are both arranged to be height-adjustable.

[0028] After the adjustable laser positioning and laying-out device is installed, it is supported and stabilized by the support frame 4, the level positioning bubble 5 is displayed in the center, and after the positioning plate 2 is aligned with the on-site positioning line, the laser instrument is adjusted to the corresponding scale, and finally the laser laying-out work can be carried out. The utility model is suitable for different usage requirements and is simple to operate and convenient to use.

[0029] The scalable ruler 1 includes an outer ruler body 1.1 and an inner ruler body 1.2, the bottom end of the inner ruler body 1.2 can be inserted into the outer ruler body 1.1 by lifting and lowering, and both the inner ruler body 1.2 and the outer ruler body 1.1 are cylindrical structures, and a ruler positioning component 6 for fixing the inner ruler body 1.2 at different heights on the outer ruler body 1.1 is arranged between the inner ruler body 1.2 and the outer ruler body 1.1. The inner ruler body 1.2 can be extended and retracted in the outer ruler body 1.1, and the length of the scale ruler 1 can be adjusted according to the requirements of the drawing, so that the scale ruler 1 can meet the use requirements.

[0030] The ruler positioning component 6 includes a ruler body through groove 6.1, a ruler body pressure block 6.2 and a ruler body top screw 6.3, wherein the ruler body through groove 6.1 is opened on one side of the outer ruler body 1.1, and the top end of the ruler body through groove 6.1 passes through the top end of the outer ruler body 1.1, the inner side end of the ruler body top screw 6.3 passes through the ruler body through groove 6.1 and is rotatably installed on the inner ruler body 1.2, the ruler body pressure block 6.2 is threadedly sleeved on the outside of the ruler body top screw 6.3, and the ruler body pressure block 6.2 has an arc structure adapted to the surface of the outer ruler body 1.1.

[0031] By loosening the ruler body top screw 6.3, the inner ruler body 1.2 can be pulled out to adjust the overall length of the scale 1. Afterwards, the ruler body top screw 6.3 can be screwed in to fix the inner ruler body 1.2 at the adjusted height, thereby fixing the length of the scale 1. The ruler body pressing block 6.2 has a larger contact surface with the outer ruler body 1.1, thereby improving the fixing effect.

[0032] The positioning plate 2 and the laser instrument bracket 3 both include a lifting sleeve component 7, wherein the lifting sleeve component 7 includes a sliding sleeve 7.1, a first side top screw 7.2, a second side top screw 7.3 and a top screw pressing block 7.4. The first side top screw 7.2 and the second side top screw 7.3 are both threadedly installed on the sliding sleeve 7.1, the first side top screw 7.2 and the second side top screw 7.3 are symmetrically distributed, the inner diameter of the sliding sleeve 7.1 is adapted to the outer diameter of the outer scale body 1.1, the top screw pressing block 7.4 is rotatably installed on the outside of the first side top screw 7.2, the top screw pressing block 7.4 is arranged to be an arc structure adapted to the surface of the inner scale body 1.2, the top screw pressing block 7.4 is located between the inner scale body 1.2 and the sliding sleeve 7.1, and the top screw pressing block 7.4 is arranged to be adapted to the width of the scale body through groove 6.1 and aligned with the scale body through groove 6.1.

[0033] The sleeve 7.1 can slide on the outside of the inner scale body 1.2 and the outer scale body 1.1, and thus can adjust the height of the positioning plate 2 and the laser instrument bracket 3 to the greatest extent to meet the engineering requirements to the greatest extent. When the sleeve 7.1 is fixed on the inner scale body 1.2, the second side top screw 7.3 and the top screw pressing block 7.4 are respectively squeezed on both sides of the inner scale body 1.2 to fix the positioning plate 2 and the laser instrument bracket 3. When the sleeve 7.1 is fixed on the outer scale body 1.1, the second side top screw 7.3 abuts against the outside of the outer scale body 1.1, and the top screw pressing block 7.4 abuts against the outside of the inner scale body 1.2 to fix the positioning plate 2 and the laser instrument bracket 3.

[0034] The surface of the inner scale body 1.2 is provided with a scale body strip groove 8 aligned with the scale body through groove 6.1, and the inner side end of the first side top screw 7.2 passes through the top screw pressing block 7.4 and is inserted into the scale body strip groove 8. The first side top screw 7.2 cooperates with the scale body strip groove 8 to fix the positioning plate 2 and the laser instrument bracket 3 on the inner scale body 1.2 in the circumferential direction. In addition, the scale body through groove 6.1 cooperates with the scale body pressing block 6.2 to achieve the fixation of the inner scale body 1.2 and the outer scale body 1.1 in the circumferential direction, and then, the top screw pressing block 7.4 and the scale body through groove 6.1 can always be kept aligned, which facilitates the displacement of the positioning plate 2 and the laser instrument bracket 3 between the inner scale body 1.2 and the outer scale body 1.1.

[0035] The positioning plate 2 includes an annular plate 2.1 fixedly arranged at the top of the sliding sleeve 7.1, and the inner diameter of the slide plate is set to match the outer diameter of the outer ruler body 1.1, and an annular groove 2.2 is provided on the upper surface of the annular plate 2.1, and a limiting circular plate 9 matching the size of the annular groove 2.2 is provided at the top of the inner ruler body 1.2. When the positioning plate 2 is at the highest position of the inner ruler body 1.2, the limiting circular plate 9 is located in the annular groove 2.2, and the top of the inner ruler body 1.2 can be set as the zero scale of the scale line, so as to better adjust the height of the laser instrument bracket 3.

[0036] The laser instrument bracket 3 includes a base plate, a slide plate and a fine-tuning bolt 3.1, wherein the base plate includes a first plate body portion 3.2, a second plate body portion 3.3 vertically arranged in the middle of one side of the first plate body portion 3.2 and a sleeve hole 3.4 opened on the second plate body portion 3.3, and the inner diameter of the sleeve hole 3.4 is adapted to the outer diameter of the outer ruler body 1.1, the second plate body portion 3.3 is installed on the top of the sliding sleeve 7.1, the slide plate includes a third plate body portion 3.5 and a fourth plate body portion 3.6 vertically arranged at the bottom end of the outer side surface of the third plate body portion 3.5, the fourth plate body portion 3.6 is used to install a laser positioning and laying-out instrument, the third plate body portion 3.5 is slidably installed on the outer side surface of the first plate body portion 3.2 in the height direction, the fine-tuning bolt 3.1 is longitudinally arranged and rotatably installed on the third plate body portion 3.5, and the fine-tuning bolt 3.1 is threadedly connected to the first plate body portion 3.2.

[0037] By utilizing the displacement of the sleeve 7.1 on the surface of the inner ruler 1.2 and the outer ruler 1.1, the height of the laser bracket 3 can be quickly adjusted after loosening the first side top screw 7.2 and the second side top screw 7.3. After the laser bracket 3 is adjusted to a rough height, the height of the laser can be finely adjusted by rotating the fine-tuning bolt 3.1 to slowly displace the slide plate on the seat plate. In this way, the height adjustment of the laser bracket 3 is conveniently adjusted by utilizing the combination of quick adjustment and fine adjustment.

[0038] The inner side of the third plate body 3.5 is provided with a slider 10, the outer side of the first plate body 3.2 is provided with a slide groove 11, the slider 10 is slidably arranged in the slide groove 11, and the upper and lower sides of the inner side of the third plate body 3.5 are provided with limit plates 12, the slider 10 is located between the two limit plates 12, and the two ends of the fine-tuning bolt 3.1 are rotatably mounted on the two limit plates 12. The upper and lower limit plates 12 can prevent the slider 10 from escaping from the slide groove 11, so as to prevent the slider from being separated from the seat plate.

[0039] The support frame 4 includes a support plate 4.1 sleeved on the bottom end of the outer ruler body 1.1 and a plurality of adjusting bolts 4.2 threadedly penetrated on the support plate 4.1 and distributed symmetrically in the center. The support plate 4.1 is arranged at the bottom end of the outer ruler body 1.1, so that there is enough space on the outer ruler body 1.1 for large-scale lifting and lowering adjustment of the laser instrument bracket 3 and the positioning plate 2.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser positioning and laying-out device capable of being raised and lowered, characterized in that: The invention comprises a scale (1), a positioning plate (2), a laser instrument bracket (3), a support frame (4) and a level positioning bubble (5), wherein the positioning plate (2) is mounted on the scale (1), the laser instrument bracket (3) is mounted on the scale (1), the scale (1) is mounted on the support frame (4), the level positioning bubble (5) is mounted on the support frame (4), and the positioning plate (2) and the laser instrument bracket (3) are both arranged to be height-adjustable.

2. The laser positioning and laying-out device capable of being raised and lowered according to claim 1 is characterized in that: The scale (1) comprises an outer scale body (1.1) and an inner scale body (1.2); the bottom end of the inner scale body (1.2) can be inserted into the outer scale body (1.1) in a manner of being raised or lowered; the inner scale body (1.2) and the outer scale body (1.1) are both cylindrical structures; and a scale positioning component (6) is provided between the inner scale body (1.2) and the outer scale body (1.1) for fixing the inner scale body (1.2) at different heights on the outer scale body (1.1).

3. The laser positioning and laying-out device capable of being raised and lowered according to claim 2 is characterized in that: The ruler positioning component (6) comprises a ruler body through groove (6.1), a ruler body pressure block (6.2) and a ruler body top screw (6.3), wherein the ruler body through groove (6.1) is opened on one side of the outer ruler body (1.1), and the top end of the ruler body through groove (6.1) passes through the top end of the outer ruler body (1.1), the inner side end of the ruler body top screw (6.3) passes through the ruler body through groove (6.1) and is rotatably mounted on the inner ruler body (1.2), the ruler body pressure block (6.2) is threadedly sleeved on the outside of the ruler body top screw (6.3), and the ruler body pressure block (6.2) presents an arc structure adapted to the surface of the outer ruler body (1.1).

4. The laser positioning and laying-out device capable of being raised and lowered according to claim 3 is characterized in that: The positioning plate (2) and the laser instrument bracket (3) both include a lifting sleeve component (7), wherein the lifting sleeve component (7) includes a sliding sleeve (7.1), a first side top screw (7.2), a second side top screw (7.3) and a top screw pressing block (7.4), the first side top screw (7.2) and the second side top screw (7.3) are both threadedly mounted on the sliding sleeve (7.1), the first side top screw (7.2) and the second side top screw (7.3) are symmetrically distributed, and the inner diameter of the sliding sleeve (7.1) is 1.1mm thick and the inner diameter of the sliding sleeve (7.1) is 1.1mm thick. The outer diameter of the outer ruler (1.1) is adapted, the top screw pressing block (7.4) is rotatably mounted on the outside of the first side top screw (7.2), the top screw pressing block (7.4) is arranged to be an arc structure adapted to the surface of the inner ruler (1.2), the top screw pressing block (7.4) is located between the inner ruler (1.2) and the sliding sleeve (7.1), and the top screw pressing block (7.4) is arranged to be adapted to the width of the ruler body through groove (6.1) and to be aligned with the ruler body through groove (6.1).

5. The laser positioning and laying-out device capable of being raised and lowered according to claim 4 is characterized in that: The surface of the inner ruler (1.2) is provided with a ruler strip groove (8) aligned with the ruler through groove (6.1), and the inner end of the first side top screw (7.2) passes through the top screw pressing block (7.4) and is inserted into the ruler strip groove (8).

6. The laser positioning and laying-out device capable of lifting and lowering according to claim 4 is characterized in that: The positioning plate (2) comprises an annular plate (2.1) fixedly arranged at the top end of the sliding sleeve (7.1), and the inner diameter of the sliding plate is arranged to match the outer diameter of the outer ruler (1.1), an annular groove (2.2) is provided on the upper surface of the annular plate (2.1), and a limiting circular plate (9) matching the size of the annular groove (2.2) is arranged at the top end of the inner ruler (1.2).

7. The laser positioning and laying-out device capable of being raised and lowered according to claim 4 is characterized in that: The laser instrument bracket (3) comprises a base plate, a slide plate and a fine-tuning bolt (3.1), wherein the base plate comprises a first plate body (3.2), a second plate body (3.3) vertically arranged in the middle of one side of the first plate body (3.2), and a sleeve hole (3.4) opened on the second plate body (3.3), and the inner diameter of the sleeve hole (3.4) is matched with the outer diameter of the outer ruler (1.1), the second plate body (3.3) is installed on the top of the sliding sleeve (7.1), and the slide plate comprises a first plate body (3.2), a second plate body (3.3) vertically arranged in the middle of one side of the first plate body (3.2), and a sleeve hole (3.4) opened on the second plate body (3.3), and the inner diameter of the sleeve hole (3.4) is matched with the outer diameter of the outer ruler (1.1), the second plate body (3.3) is installed on the top of the sliding sleeve (7.1), and the slide plate comprises a first The third plate body (3.5) and the fourth plate body (3.6) are vertically arranged at the bottom end of the outer side surface of the third plate body (3.5), and the fourth plate body (3.6) is used to install a laser positioning and laying-out instrument. The third plate body (3.5) is slidably installed on the outer side surface of the first plate body (3.2) in the height direction. The fine-tuning bolt (3.1) is longitudinally arranged and rotatably installed on the third plate body (3.5), and the fine-tuning bolt (3.1) is threadedly connected to the first plate body (3.2).

8. The laser positioning and laying-out device capable of being raised and lowered according to claim 7 is characterized in that: A slider (10) is provided on the inner side surface of the third plate body (3.5), a slide groove (11) is provided on the outer side of the first plate body (3.2), the slider (10) is slidably arranged in the slide groove (11), and limit plates (12) are provided on the upper and lower sides of the inner side surface of the third plate body (3.5), the slider (10) is located between the two limit plates (12), and the two ends of the fine-tuning bolt (3.1) are rotatably mounted on the two limit plates (12) respectively.

9. The laser positioning and laying-out device capable of being raised and lowered according to claim 2, characterized in that: The support frame (4) comprises a support plate (4.1) sleeved on the bottom end of the outer ruler (1.1) and a plurality of adjusting bolts (4.2) threadedly penetrated through the support plate (4.1) and distributed in a centrally symmetrical manner.