Pipe saddle opening scribing device and method

Abstract

The invention provides a pipe saddle opening scribing device and method in the field of pipelines. A pipe is located on a pipe base, a concentric circle laser transmitter cantilever is arranged on the side face of the pipe base, a concentric circle laser transmitter is assembled on the concentric circle laser transmitter cantilever, and the concentric circle laser transmitter projects concentric circles on the pipe. The method includes the following steps that firstly, a pipe base is selected, the diameter of the outer circle of the end face of a pipe is measured through a vernier caliper, and the size of the selected fixed pipe base or movable pipe base is determined; 2, a concentric circle laser transmitter is installed, and the concentric circle laser transmitter is installed on the pipe base; thirdly, a pipe is installed, the pipe and a pipe base are fixed, and after the position of the pipe is adjusted, a concentric circle laser transmitter is turned on to project concentric circles to the pipe; and step 4, adjusting the size of the concentric circle and scribing the pipe, adjusting the size of the concentric circle to a proper size, and scribing according to the projection of the concentric circle to complete the operation.

Description

Technical Field

[0001] The invention relates to saddle mouth marking in the field of pipes, and in particular to a pipe saddle mouth marking device and method. Background Art

[0002] The shipbuilding industry is complex in construction, with diverse piping systems and a complicated working environment. Construction involves cutting and welding saddle mouths for pipes of various calibers and materials. Before construction, CNC saddle cutting machines are generally used to prefabricate saddle mouths for pipes. However, some pipes do not meet the prefabrication conditions or require subsequent modifications, requiring on-site sampling and on-site saddle mouth production.

[0003] However, the inventors of this application found that the above technology has at least the following technical problems in the process of implementing the technical solution of the invention in the embodiment of this application: At present, on-site production generally uses paper templates or cuts the saddle mouth after calculating the positioning and marking. The efficiency and accuracy of a single construction are not high. At the same time, the template needs to be remade for each construction and the template cannot be reused, resulting in a waste of resources. The existing construction method is not suitable for batch operations. Summary of the invention

[0004] In order to solve the deficiencies in the prior art and to solve the problem of high-precision positioning and marking of the pipe saddle mouth, the embodiment of the present application provides a pipe saddle mouth marking device and method. The method uses a pipe saddle mouth marking device to project concentric circles onto the pipe using a concentric circle laser emitter, thereby solving the technical problem of pipe saddle mouth marking.

[0005] The solution adopted by the embodiment of the present application to solve the technical problem is: A pipe saddle mouth marking device comprises a concentric circle laser emitter cantilever, a pipe base and a concentric circle laser emitter; The pipe base includes fixed pipe base and mobile pipe base; the fixed pipe base and mobile pipe base need to be adapted according to the pipe and working conditions; The fixed tube base adopts a V-shaped structure and has an automatic centering function to ensure that the center line of the tube coincides with the center line of the fixed tube base when the tube is placed on the fixed tube base; the side of the fixed tube base has a through hole for connecting and fixing with the cantilever of the concentric circle laser emitter, and the straight-line distance between the fixed tube base and the cantilever of the concentric circle laser emitter along the Y-axis direction of the tube can be changed by changing the through hole; The movable tube base can replace the fixed tube base for movement; the movable tube base adopts a V-shaped design as a whole, with through holes reserved on the side, which can be used not only to fix the cantilever of the concentric laser emitter, but also to position it with the tube fixing parts; The pipe fixing part is a conventional metal pipe clamp with a hole on the side of the metal pipe clamp, which can be directly fixed to the movable pipe base by bolts or steel wires; The cantilever of the concentric circle laser transmitter has the function of lifting and lowering. At the same time, a straight line laser transmitter is equipped on its column to assist in confirming the center point of the saddle mouth. The concentric circle laser transmitter is a five-ring concentric circle laser transmitter, which is convenient for adjusting the circle and can also ensure that the circular laser is projected vertically on the tube according to the observed distance between the concentric circles; the laser of the concentric circle laser transmitter has three colors: red, green and blue. The laser color is adapted according to the environment and the color of the processed tube. If necessary, the surface of the tube is colored or the ambient light is blocked to improve the clarity of the laser projection, ensuring that the laser is clearly visible when projected on the outer wall of the tube; Among them, the tube is located on the tube base, and a concentric circle laser emitter cantilever is arranged on the side of the tube base. The concentric circle laser emitter is equipped with a concentric circle laser emitter on the concentric circle laser emitter cantilever. The center line of the V-shaped surface of the tube base coincides with the center point of the concentric circle laser emitter to ensure that the saddle mouth on the tube is not eccentric. The saddle mouth size D is confirmed according to the construction requirements, so that the concentric circle laser emitter projects the concentric circle on the tube to coincide with D. The overlapping laser projections are used for sequential marking to achieve saddle mouth marking.

[0006] Furthermore, the number and position of the pipe fixings are adjusted according to working conditions.

[0007] Furthermore, the fixed pipe base has sliding elements or lubricants added to the contact surface between the inner side of the base and the pipe. The sliding elements include rollers, plane bearings and roller bearings, and the lubricants include lubricating oil and grease.

[0008] Furthermore, the movable pipe base has a flexible protective material, such as a rubber, silicone and a thin copper sheet, added to the inner side of the base in contact with the pipe.

[0009] In order to further solve the technical problem to be solved by the embodiment of the present application, a pipe saddle mouth marking method provided in the embodiment of the present application includes the following steps: Step 1: Select a pipe base, use a vernier caliper to measure the outer diameter of the pipe end face, and determine the size of the selected fixed pipe base or mobile pipe base; Step 2: Install the concentric circle laser transmitter on the tube base; Step 3: Install the tube, fix the tube to the tube base, adjust the position of the tube, turn on the concentric circle laser emitter 3 and project the concentric circles onto the tube; Step 4: Adjust the size of the concentric circles and mark the tube. Adjust the size of the concentric circles to the appropriate size, mark according to the projection of the concentric circles, and complete the task.

[0010] Furthermore, in step two, concentric circle laser transmitters generally use green light or blue light outdoors. Similarly, if the color of the outer wall of the tube is reddish such as copper, green light or blue light is used. In most cases, red light is recommended. If all three types of lighting are not ideal, the outer wall of the tube is painted. White or black spray paint can be used to increase the clarity of the projected laser to ensure the accuracy of the marking. Similarly, when necessary, in order to increase the clarity of the projected laser, it is recommended to block the natural light and lighting in the working environment with baffles and enclosures.

[0011] Furthermore, in step three, a straight line laser emitter is added to the center point of the cantilever column of the concentric circle laser emitter to assist in projection, and the projected straight line directly intersects with the tube; the center line of the V-shaped surface of the base coincides with the center point of the concentric circle laser emitter to ensure that the saddle mouth on the tube is not eccentric.

[0012] Furthermore, in step four, based on the spacing between the five concentric circles projected by the concentric circle laser transmitter, ensure that the circular laser is projected vertically onto the pipe to avoid skewness to ensure the accuracy of the saddle mouth marking; confirm the saddle mouth size D according to the construction requirements, make the size of the concentric circles projected on the pipe coincide with D, and use the overlapping laser projections to perform sequential marking to achieve saddle mouth marking.

[0013] Positive effects: One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. Since the embodiment of the present application adopts a technical means of adopting a V-shaped structure in the pipe base and coinciding the center line of the pipe with the center line of the fixed pipe base, the center line of the pipe coincides with the center point of the concentric circle laser emitter, and the concentric circle laser emitter projects the concentric circles on the pipe to coincide with the saddle line, which effectively solves the technical problem of saddle mouth marking in the prior art, and then realizes the technical effect of sequential marking using overlapping laser projections to achieve saddle mouth marking.

[0014] 2. Since the embodiments of the present application adopt the technical means of adding sliding elements or lubricants to the contact surface between the inner side of the fixed pipe base and the pipe, and adding flexible protective materials to the contact surface between the inner side of the base and the pipe of the movable pipe base, the technical problem of saddle mouth scribing in the prior art is effectively solved, thereby achieving the technical effect of avoiding scratches and crushing on the pipe surface and reducing damage to the pipe surface.

[0015] 3. Since the embodiment of the present application adopts a technical means of providing a straight line laser emitter for auxiliary projection at the center point of the cantilever column of the concentric circle laser emitter, the straight line projected by the straight line laser emitter directly intersects with the pipe, the relative distance between the starting position and the ending position of the saddle mouth is equal to D, and the center point O is aligned with the cantilever of the concentric circle laser emitter in the X-axis direction, which effectively solves the technical problem of saddle mouth marking in the prior art, and thus achieves the technical effect of accurately confirming the center point O of the saddle mouth.

[0016] 4. Since the embodiment of the present application adopts the technical means that the cantilever of the concentric circle laser emitting device has a lifting function, when the concentric circle laser emitter is raised on the Z axis, the size becomes larger, and when it is lowered on the Z axis, the size becomes smaller. The projection of the concentric circle on the tube changes with the relative distance between the concentric circle laser emitter and the tube, and the size of the concentric circle is adjusted to an appropriate size. The change of D is achieved by adjusting the Z axis distance, which effectively solves the technical problem of saddle mouth marking in the prior art, and thus achieves the technical effect of keeping the size of the saddle mouth D basically the same.

[0017] 5. Since the embodiment of the present application adopts the technical means of concentric circle laser emitters with three colors of red, blue and green light, green light or blue light is generally used outdoors. Similarly, if the color of the outer wall of the tube is reddish such as copper, green light or blue light is used. In most cases, red light is recommended, which effectively solves the technical problem of saddle mouth marking in the prior art. The red light has higher indicativeness and human visual recognition, thereby achieving the technical effect of ensuring the accuracy of marking.

[0018] 6. Since the embodiment of the present application uses a concentric circle laser emitter, if all three types of lighting are not ideal, the outer wall of the tube is colored by spraying white or black self-paint, or the natural light and lights in the working environment are blocked, and the technical means of blocking with baffles and enclosures are used to effectively solve the technical problems of saddle mouth marking in the prior art, and increase the clarity of the projected laser to ensure the accuracy of marking. At the same time, the clarity of the laser projection is increased by the light difference, thereby achieving the technical effect of improving the accuracy of saddle line marking.

[0019] The invention is suitable for application as a pipe saddle mouth marking device and method. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1This is a schematic diagram of a fixed saddle mouth marking device according to this embodiment; Figure 2 This is a front view of the fixed saddle mouth marking device of this embodiment; Figure 3 This is a side view of the fixed saddle mouth marking device of this embodiment; Figure 4 This is a top view of the fixed saddle mouth marking device of this embodiment; Figure 5 This is a schematic diagram of a mobile saddle mouth marking device according to this embodiment; Figure 6 This is a front view of the mobile saddle mouth marking device of this embodiment; Figure 7 It is a side view of the mobile saddle mouth marking device of this embodiment; Figure 8 This is a top view of the mobile saddle mouth marking device of this embodiment; Fig. 9 This is a schematic diagram of laser concentric circles in this embodiment; Fig.10 These are reference values ​​for the basic dimensions of the laser concentric circles in this embodiment.

[0022] In the figure, 1. Concentric circle laser emitter cantilever; 2. Fixed tube base; 3. Concentric circle laser emitter; 4. Tube fixing part; 5. Movable tube base. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Although the embodiments of the present invention have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0024] As shown in the figure, a pipe saddle mouth marking device includes a concentric circle laser emitter cantilever 1, a pipe base and a concentric circle laser emitter 3; The pipe base includes a fixed pipe base 2 and a movable pipe base 5; the fixed pipe base 2 and the movable pipe base 5 need to be adapted according to the pipe and the working conditions; The fixed pipe base 2 adopts a V-shaped structure and has an automatic self-aligning function to ensure that the center line of the pipe coincides with the center line of the fixed pipe base 2 when the pipe is placed on the fixed pipe base 2; if the pipe diameter and weight are large, the contact surface between the fixed pipe base 2 and the pipe can be increased by rolling bearings to adopt a rolling pipe mounting method; the side of the fixed pipe base 2 has a through hole for connecting and fixing with the concentric circle laser transmitter cantilever 1, and the linear distance between the fixed pipe base 2 and the concentric circle laser transmitter cantilever 1 along the Y-axis direction of the pipe can be changed by changing the through hole; The movable tube base 5 can replace the fixed tube base 2 for movement; the movable tube base 5 adopts a V-shaped design as a whole, but the length and height are reduced compared with the fixed tube base 2 to reduce the weight, and a through hole is reserved on the side of the movable tube base 5, which can not only be used to fix the concentric circle laser transmitter cantilever 1, but also can be used for positioning with the tube fixing piece 4; The pipe fixing part 4 is a conventional metal pipe clamp with a hole on the side of the metal pipe clamp, which can be directly fixed to the movable pipe base 5 by bolts or steel wires to ensure that the entire movable pipe base 5 is fixed to the pipe as a whole. The use of the metal pipe clamp can make the movable pipe base 5 directly fixed to the pipe. When the pipe is suspended in the air, the device can also be used by riding on the pipe, which effectively increases the working range of the device and is not limited by the pipe. The number and position of the pipe fixing part 4 are adjusted according to the working conditions. The cantilever 1 of the concentric circle laser transmitter is a column frame with adjustable vertical height. It can be adjusted by screw, plug-in or hydraulic lifting, as long as the vertical lifting function of the Z axis is guaranteed; the side column of the cantilever 1 of the concentric circle laser transmitter needs to reserve a certain distance from the side of the fixed pipe base 2 to avoid interference with the column of the cantilever 1 of the concentric circle laser transmitter when the large-diameter pipe is placed on the pipe base; the cantilever 1 of the concentric circle laser transmitter device has a lifting function, and a straight line laser transmitter is selected on its column to assist in confirming the center point of the saddle mouth; The concentric circle laser emitter 3 is a five-ring concentric circle laser emitting device, which is convenient for adjusting the circle and can also ensure that the circular laser is projected vertically on the pipe according to the observed spacing between the concentric circles, so as to ensure the accuracy of the saddle mouth marking and avoid skew; the concentric circle laser emitter 3 is powered by a DC low voltage of 5V to ensure safety, and its outer shell is cylindrical, which is convenient for installation and ensures concentricity. The laser of the concentric circle laser emitter 3 has three colors: red, green and blue. The laser color is adapted according to the environment and the appearance color of the processed pipe. If necessary, the surface of the pipe is colored or the ambient light is blocked to improve the clarity of the laser projection, ensuring that the laser is clearly visible when projected onto the outer wall of the pipe; Among them, the pipe is located on the pipe base, and a concentric circle laser emitter cantilever 1 is arranged on the side of the pipe base. A concentric circle laser emitter 3 is installed on the concentric circle laser emitter cantilever 1. The center line of the V-shaped surface of the pipe base coincides with the center point of the concentric circle laser emitter 3 to ensure that the saddle mouth on the pipe is not eccentric. The saddle mouth size D is confirmed according to the construction requirements, so that the concentric circle laser emitter 3 projects the concentric circle on the pipe to coincide with D, and the overlapping laser projections are used for sequential marking to achieve saddle mouth marking.

[0025] A method for marking a pipe saddle mouth comprises the following steps: Step 1: Select a pipe base, use a vernier caliper to measure the outer diameter of the pipe end face, and determine the size of the selected fixed pipe base 2 or movable pipe base 5. The fixed pipe base 2 can add sliding elements or lubricants on the inner side of the base and the contact surface with the pipe to facilitate the adjustment of the size of the pipe in the Y-axis direction. The sliding elements include rollers, plane bearings and roller bearings, and the lubricants include lubricating oil and grease. Step 2, install the concentric circle laser emitter 3, install the concentric circle laser emitter 3 on the pipe base, and pay attention to the working environment lighting and the color of the outer wall of the pipe when selecting the concentric circle laser emitter 3. In this embodiment, the concentric circle laser emitter 3 has three colors: red light, blue light, and green light. Generally, green light or blue light is used outdoors. Similarly, if the outer wall color of the pipe is reddish such as copper, green light or blue light is used. In most cases, it is recommended to use red light. The indicative property of red light and human visual recognition are higher. If the three types of lighting are not ideal, the outer wall of the pipe is colored. White or black spray paint can be sprayed to increase the clarity of the projected laser to ensure the accuracy of the marking. Similarly, in order to increase the clarity of the projected laser when necessary, it is recommended to block the natural light and lights in the working environment, and use baffles and enclosures to block them, so as to increase the clarity of the laser projection through the light difference; Step three, install the pipe and fix the pipe to the pipe base. If you choose a mobile pipe base 5, you need to confirm the starting and ending positions of the saddle mouth before fixing the pipe to avoid adjustment after fixing. Confirm the saddle mouth D according to the on-site construction requirements, draw a straight line along the Y axis at the highest point of the pipe, and then mark the starting position, ending position and center point O of the saddle mouth on the line. The relative distance between the starting position and the ending position is equal to D. Note that the center point O is aligned with the concentric circle laser transmitter cantilever 1 in the X-axis direction. To facilitate finding and marking point O, add a straight line laser transmitter at the center point position on the column of the concentric circle laser transmitter cantilever 1 to assist in projection. Projection The straight line directly intersects with the pipe, and it is not drawn in the diagram because it has no effect on the basic steps of the whole method; if a fixed pipe base 2 is selected, it is only necessary to place the pipe naturally on the fixed pipe base 2. If a mobile pipe base 5 is selected, it is necessary to use a pipe fixing member 4 to fix the pipe to the mobile pipe base 5. In the diagram, one pipe fixing member 4 is selected. In actual situations, multiple pipe fixing members 4 can be selected to ensure the reliability of the fixation. After fixation, it is necessary to ensure that the connection between the pipe and the mobile pipe base 5 is reliable. At the same time, in order to avoid scratching or crushing the pipe, the mobile pipe base 5 and the pipe can directly increase flexible protective materials, such as rubber, silicone and thin copper skin; Step 4: Adjust the size of the concentric circles on the tube base and mark the tube. Adjust the size of the concentric circles to an appropriate size. The display size of the concentric circles on the tube, i.e., the projection size, changes with the relative distance between the concentric circle laser emitter 3 and the tube. When the concentric circle laser emitter 3 is raised on the Z axis, the size becomes larger, and when it is lowered on the Z axis, the size becomes smaller. It is this characteristic that makes this method widely applicable. The change of D can be achieved by adjusting the Z axis distance. The size of the actual cut saddle mouth is basically different. This method solves a series of problems caused by the change of the saddle mouth D. Fig.10 It is a reference table of the projection distance and the size of the concentric circles of a type of concentric circle laser transmitter 3. In actual situations, as long as the concentric circles cover D, it will be fine. Because we have selected a concentric circle laser transmitter 3 with five concentric circles, it is not only convenient for the projection marking of the circles, but also can be used to refer to whether the relative position of the pipe and the device is vertical. If it is found that the relative distance between the concentric circles has changed, it means that the device is not installed correctly and needs to be reinstalled and adjusted. The concentric circles need to be projected vertically to the pipe to ensure the size of the saddle mouth. If the concentric circles are tilted, there will be obvious deformation. After adjusting the Z axis, fix the Z axis. The fixing method is not marked in the attached figure of the manual. Bolts can be inserted into the reserved holes for fixing, or other structures with lifting functions can be selected. Mark points according to the projection of the concentric circles on the pipe, connect the points into lines, realize the marking function, and complete the operation.

[0026] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: Since the tube base adopts a V-shaped structure, the center line of the tube coincides with the center line of the fixed tube base, so the center line of the tube coincides with the center point of the concentric circle laser emitter 3. The concentric circle laser emitter 3 projects the concentric circles onto the tube to coincide with the saddle line, and then uses the overlapping laser projections to mark in sequence, thereby achieving saddle mouth marking.

[0027] Since sliding elements or lubricants are added to the fixed pipe base 2 on the inner side of the base in contact with the pipe, the sliding elements include rollers, plane bearings and roller bearings, and the lubricants include lubricating oil and grease; the movable pipe base 5 adds flexible protective materials such as rubber, silicone and thin copper sheet on the inner side of the base in contact with the pipe; therefore, scratches and crushing of the pipe surface can be avoided and damage to the pipe surface can be reduced.

[0028] Since a straight line laser transmitter is provided at the center point of the column of the concentric circle laser transmitter cantilever 1 to assist in projection, the projected straight line directly intersects with the tube, so the starting position, the ending position and the center point O of the saddle mouth, where the relative distance between the starting position and the ending position is equal to D, the center point O is aligned with the concentric circle laser transmitter cantilever 1 in the X-axis direction, and the center point O of the saddle mouth is accurately confirmed.

[0029] Since the cantilever 1 of the concentric circle laser emitting device has a lifting function, when the concentric circle laser emitter 3 is raised on the Z axis, its size becomes larger, and when it is lowered on the Z axis, its size becomes smaller. Therefore, the projection of the concentric circle on the pipe changes with the relative distance between the concentric circle laser emitter 3 and the pipe, thereby adjusting the size of the concentric circle to an appropriate size. By adjusting the Z axis distance to realize the change of D, the size of the actual cut saddle mouth D is basically the same.

[0030] Since the concentric circle laser emitter 3 has three colors of red, blue and green, green or blue light is generally used outdoors. Similarly, if the outer wall color of the tube is reddish such as copper, green or blue light is used. In most cases, red light is recommended. Therefore, red light has higher indicativeness and human visual recognition, ensuring the accuracy of marking.

[0031] If the three types of illumination of the concentric circle laser emitter 3 are not ideal, the outer wall of the tube is colored by spraying white or black self-painted paint, or the natural light and lamplight in the working environment are blocked by using baffles and enclosures; therefore, the clarity of the projected laser is increased to ensure the accuracy of the marking, and at the same time, the clarity of the laser projection is increased by the light difference.

[0032] It is worth noting that the contents not described in detail in the specification belong to the prior art known to those skilled in the art, and the model parameters of the concentric circle laser emitter 3 and the tube fixture 4 are not specifically limited and can be determined using conventional equipment. In this technical solution, the electrical control components not mentioned are not shown in the figure because they belong to the prior art and will not be described here.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. 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 pipe saddle mouth marking device, characterized by: It comprises a concentric circle laser emitter cantilever (1), a tube base and a concentric circle laser emitter (3); The pipe base includes a fixed pipe base (2) and a movable pipe base (5); the fixed pipe base (2) and the movable pipe base (5) need to be adapted according to the pipe and the operating conditions; The fixed tube base (2) adopts a V-shaped structure and has an automatic centering function, ensuring that the center line of the tube coincides with the center line of the fixed tube base (2) when the tube is placed on the fixed tube base (2); the side of the fixed tube base (2) has a through hole for connecting and fixing with the concentric circle laser emitter cantilever (1), and the straight-line distance between the fixed tube base (2) and the concentric circle laser emitter cantilever (1) along the tube Y-axis direction can be changed by changing the through hole; The movable tube base (5) can replace the fixed tube base (2) for movement; the movable tube base (5) is designed in a V-shape as a whole, and a through hole is reserved on the side, which can be used not only to fix the cantilever (1) of the concentric circle laser emitter, but also to position it with the tube fixing member (4); The pipe fixing member (4) is a conventional metal pipe clamp having a hole on the side of the metal pipe clamp, and can be directly fixed to the movable pipe base (5) by bolts or steel wires; The concentric circle laser transmitter cantilever (1) has a lifting function, and a straight line laser transmitter is optionally provided on its column to assist in confirming the center point of the saddle mouth; The concentric circle laser emitter (3) is a five-ring concentric circle laser emitter, which is convenient for adjusting the circle and can also ensure that the circular laser is vertically projected on the tube according to the observed spacing between the concentric circles; the laser of the concentric circle laser emitter (3) has three colors: red light, green light, and blue light. The laser color is adapted according to the environment and the color of the processed tube surface. If necessary, the surface of the tube is colored or the ambient light is shielded to improve the clarity of the laser projection, ensuring that the laser is clearly visible when projected on the outer wall of the tube; The pipe is seated on a pipe base, a concentric circle laser emitter cantilever (1) is arranged on the side of the pipe base, a concentric circle laser emitter (3) is mounted on the concentric circle laser emitter cantilever (1), a center line of the V-shaped surface of the pipe base coincides with a center point of the concentric circle laser emitter (3) to ensure that the saddle mouth on the pipe is not eccentric, the saddle mouth size D is confirmed according to construction requirements, the concentric circle projected by the concentric circle laser emitter (3) on the pipe is coincident with D, and sequential marking is performed using the coincident laser projections to achieve saddle mouth marking.

2. A pipe saddle marking device according to claim 1, characterized in that: The number and position of the pipe fixing parts (4) are adjusted according to working conditions.

3. The pipe saddle marking device according to claim 1, characterized in that: The fixed pipe base (2) has a sliding element or lubricant added to the inner side of the base on the contact surface with the pipe. The sliding element includes a roller, a plane bearing and a roller bearing. The lubricant includes lubricating oil and grease.

4. The pipe saddle marking device according to claim 1, characterized in that: The movable pipe base (5) has a flexible protective material added to the inner side of the base on the contact surface with the pipe, such as rubber, silica gel and thin copper sheet.

5. A method for marking a pipe saddle mouth, characterized by: The device according to any one of claims 1 to 4 comprises the following steps: Step 1: Select a pipe base, use a vernier caliper to measure the outer diameter of the pipe end face, and determine the size of the selected fixed pipe base or mobile pipe base; Step 2: Install the concentric circle laser emitter (3), and install the concentric circle laser emitter (3) on the pipe base; Step 3: Install the tube, fix the tube to the tube base, adjust the position of the tube, turn on the concentric circle laser emitter (3) and project the concentric circle onto the tube; Step 4: Adjust the size of the concentric circles and mark the tube. Adjust the size of the concentric circles to the appropriate size, mark according to the projection of the concentric circles, and complete the task.

6. A method for marking a pipe saddle mouth according to claim 5, characterized in that: In the step 2, the concentric circle laser emitter (3) generally uses green light or blue light outdoors. Similarly, if the color of the outer wall of the tube is reddish such as copper, green light or blue light is used. In most cases, red light is recommended. If all three types of light are not ideal, the outer wall of the tube is painted. White or black spray paint can be sprayed to increase the clarity of the projected laser to ensure the accuracy of the marking. Similarly, when necessary, in order to increase the clarity of the projected laser, it is recommended to block the natural light and lighting in the working environment by using baffles or enclosures.

7. A pipe saddle marking method according to claim 5, characterized in that: In the step 3, a straight line laser emitter is added at the center point of the column of the concentric circle laser emitter cantilever (1) to assist in projection, and the projected straight line directly intersects with the tube; the center line of the V-shaped surface of the base coincides with the center point of the concentric circle laser emitter (3) to ensure that the saddle mouth on the tube is not eccentric.

8. A method for marking a pipe saddle mouth according to claim 5, characterized in that: In the fourth step, the circular laser is vertically projected onto the pipe according to the spacing between the five concentric circles projected by the concentric circle laser emitter (3), avoiding skewness to ensure the accuracy of the saddle mouth marking. The saddle mouth size D is confirmed according to the construction requirements, so that the size of the concentric circles projected onto the pipe coincides with D, and the overlapping laser projections are used to perform sequential marking to achieve the saddle mouth marking.

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