A portable installation and adjustable roughness pipe and method of use

Abstract

This invention discloses a portable, adjustable-roughness pipe and its usage method, comprising a sandwich pipe, a roughness adjustment mechanism, and a control system. The roughness adjustment mechanism and control system work together to first collect roughness data for the desired simulated location. The control system then determines the length of the solid rod of each roughness adjustment mechanism extending into the pipe. The control system then controls each roughness adjustment mechanism to control the length of the solid rod extending into the pipe, thereby simulating pipes with different roughness levels and providing a precise simulation environment for subsequent ventilation experiments. During pipe connection, the control system enables magnetic contact between flanges one and two of adjacent sandwich pipes, and a flexible sealing cover extends to create a seal, achieving rapid connection between adjacent sandwich pipes. After the ventilation experiment is completed, each sandwich pipe can be quickly disassembled and separated for easy subsequent transportation.

Description

Technical Field

[0001] This invention relates to a portable, adjustable-roughness pipe and its usage method, belonging to the technical field of pipes for mine ventilation experiments. Background Technology

[0002] In mine ventilation research, ventilation experimental devices are particularly important. As unique underground spaces, mines have complex and variable ventilation environments that directly affect miners' safety and mine production efficiency. Traditional field testing methods are limited by the harsh conditions of the underground environment, making it difficult to achieve comprehensive observation and analysis of the ventilation process. Ventilation experimental devices, on the other hand, can reproduce the key characteristics of underground ventilation through simulation in a surface laboratory, allowing researchers to conduct experiments in a safer and more controlled environment.

[0003] The core advantage of the ventilation experimental device lies in the repeatability and adjustability of its pipes. By precisely controlling experimental conditions, such as the roughness of the pipe's inner wall, researchers can simulate different ventilation scenarios and explore the impact of ventilation parameters on the mine environment. Patent application CN201410279496 provides a pipe connection structure and a pipe incorporating this structure. However, this solution only serves to provide a portable connection for the pipe and cannot change the roughness of the pipe's inner wall, thus failing to meet the need to simulate different inner wall roughness levels. Therefore, designing a pipe that is both portable and capable of simultaneously changing the inner wall roughness to meet the requirements of ventilation experiments is the technical problem this invention aims to solve. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a portable and adjustable-roughness pipe and its usage method, which can simulate pipe wall surfaces with different roughness to meet different ventilation test requirements. At the same time, it is easy to carry and transport, and can be quickly installed and disassembled.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a portable and adjustable roughness pipe, comprising multiple interlayer pipes, multiple roughness adjustment mechanisms and a control system, wherein each interlayer pipe is provided with multiple roughness adjustment mechanisms.

[0006] The sandwiched pipe has a flange 1 fixed at one end and a telescopic connecting mechanism at the other end. The flange 1 is made of magnetic material. The telescopic connecting mechanism includes a flange 2, an electromagnet 1, multiple springs 1, and a flexible sealing cover. The flange 2 is movably connected to the other end of the sandwiched pipe through multiple springs 1, allowing the flange 2 to move relative to the other end of the sandwiched pipe. The flexible sealing cover wraps around multiple springs 1, and its two ends are respectively sealed to the flange 2 and the other end of the sandwiched pipe. The flexible sealing cover can extend or fold as the flange 2 moves. The electromagnet 1 is mounted on the flange 2. When the two sandwiched pipes are connected, the electromagnet 1 of one sandwiched pipe is activated, so that the magnetic attraction force generated between it and the flange 1 of the other sandwiched pipe is greater than the deformation force of the spring 1. At this time, the flange 2 moves closer and closer to the flange 1 until it is pressed into contact.

[0007] The sandwiched pipe is composed of an inner tube and an outer tube nested together, forming a sandwich between them. The roughness adjustment mechanism includes a fixed base, an electromagnet, a movable plate, a solid rod, and a spring. The fixed base is fixed inside the sandwich, and the spring is installed between the movable plate and the fixed base to allow the movable plate to move relative to the fixed base. A through hole is opened on the inner tube, and one end of the solid rod extends into the through hole, while the other end is fixed to the movable plate. The movable plate is made of magnetic material, and the electromagnet is installed on the fixed base. When the spring is not under force, the inner wall of the inner tube is flush with one end of the solid rod. When roughness adjustment is required, the electromagnet is activated, and the magnetic repulsive force on the movable plate is greater than the deformation force of the spring. At this time, the movable plate drives one end of the solid rod to extend into the inner tube through the through hole.

[0008] The control system includes a magnetic controller and a main unit. The main unit is connected to electromagnet one and is used to control the opening and closing of electromagnet one. The main unit is connected to electromagnet two through the magnetic controller and is used to control the magnitude of the magnetic force generated by electromagnet two.

[0009] Furthermore, the flange is made of a ferromagnetic material, such as iron, cobalt, or nickel. This material is readily available and structurally stable, and can achieve the required magnetic attraction effect during use, effectively reducing production costs while ensuring the stability of the pipeline connection.

[0010] Furthermore, sealing sponge is installed around the contact surface between flange two and flange one to improve sealing performance after the two are pressed into contact.

[0011] Furthermore, the number of through holes on the inner tube is the same as the number of solid rods. This ensures that each through hole is sealed with a solid rod, preventing airflow from entering the interlayer during ventilation experiments and thus distorting the experimental data.

[0012] Furthermore, both spring one and spring two are tension springs. Tension springs have a better ability to restore tension force, ensuring the restoration effect.

[0013] The specific steps for using the aforementioned portable and adjustable-roughness pipe are as follows:

[0014] Step 1: Pipe Assembly and Disassembly: When assembling the pipes, first determine the required number of interlayer pipes. Then, arrange all interlayer pipes in a straight line with a certain distance between them. Initially, spring 1 of each interlayer pipe is in an unstretched state, and the flexible sealing cover is folded. The main unit controls electromagnet 1 to open, generating magnetic force. This causes the magnetic attraction between electromagnet 1 of each interlayer pipe and flange 1 of the adjacent interlayer pipe to exceed the deformation force of spring 1. Spring 1 then stretches and increases its deformation force, and flange 2 moves closer to flange 1 until they are pressed into contact. Simultaneously, the flexible sealing cover extends with flange 2, sealing the two interlayer pipes and completing the pipe assembly process. During subsequent ventilation experiments, electromagnet 1 remains open. When disassembling the pipes, the main unit controls electromagnet 1 to close. The magnetic attraction between electromagnet 1 and the adjacent interlayer pipes disappears. Flange 2 of each interlayer pipe, under the deformation force of spring 1, begins to move away from flange 1 until spring 1 returns to its initial state. Simultaneously, the flexible sealing cover folds with flange 2, completing the pipe disassembly and facilitating subsequent transportation or replacement of the interlayer pipes.

[0015] Step 2: Determine the insertion length of the solid rod in this simulation: First, obtain the required surface roughness data for the simulated wall. Use a surface roughness meter to measure and calculate four data points: the arithmetic mean roughness Ra, the root mean square roughness Rq, the average height of ten points Rz, and the maximum peak distance Rmax of the simulated wall. Record the changes in the instrument tip height to draw the surface profile. The relevant calculation formulas are as follows:

[0016] I. Arithmetic mean roughness:

[0017] Where: Y i is the vertical distance from the (i)th point on the surface profile to the baseline, and n is the number of data points within the sampling length;

[0018] II. Root mean square roughness:

[0019] Where: Y i is the vertical distance from the (i)th point on the surface profile to the baseline, and n is the number of data points within the sampling length;

[0020] III. Average height at ten points:

[0021] Where: P i V is the height of the i-th peak. j It is the depth of the j-th valley;

[0022] IV. The steps for calculating the maximum peak distance Rmax are as follows:

[0023] ① Select a sufficiently long evaluation length on the surface to be tested, which includes several consecutive sampling lengths;

[0024] ② Draw the surface contour line along this evaluation length. This line represents the change in height of the surface in the vertical direction.

[0025] ③ Identify the highest point (peak) and the lowest point (valley) from the surface profile;

[0026] ④ Measure the vertical distance between these two points, that is, the distance from the peak to the valley, to obtain the maximum peak distance Rmax;

[0027] After summarizing the four data obtained above, input them into the host. After processing the input data, the host determines the insertion length of the solid rod of each roughness adjustment mechanism in the inner tube of each interlayer pipe.

[0028] Step 3: Changing the roughness of the pipe interior: Initially, one end of all solid rods is flush with the inner wall of the inner pipe, which is smooth at this time. When it is necessary to change the roughness of the pipe interior, the main unit controls the magnetic force of the electromagnets of each roughness adjustment mechanism according to the insertion length of each solid rod determined in Step 2 through a magnetic controller. The moving plates of each roughness adjustment mechanism are driven by magnetic repulsion to extend one end of the solid rod through the through hole into the inner pipe. The insertion length of each solid rod is controlled according to the magnitude of the magnetic repulsion force, so that the inner wall of the pipe presents the same roughness structure as the actual construction site to be simulated, providing an accurate simulation environment for subsequent ventilation experiments. Finally, after the ventilation experiment, the ventilation data under the current roughness condition is obtained. After completion, the electromagnets are closed. At this time, the magnetic repulsion force disappears, and the moving plates are driven by the deformation and reset force of the springs to retract one end of the solid rod into the through hole, completing the reset process.

[0029] Step 4: Obtain ventilation test data under different conditions: Repeat step 2 to obtain the insertion length of each solid rod corresponding to other required simulation positions, or set different roughness and use the process in step 2 to obtain the corresponding insertion length of each solid rod. Repeat step 3 respectively to obtain ventilation data under different roughness conditions.

[0030] Compared with the prior art, the present invention adopts a combination of multiple sandwiched pipes, multiple roughness adjustment mechanisms and a control system, which has the following advantages:

[0031] 1. In this invention, the roughness adjustment mechanism and the control system work together. First, roughness data of the required simulation location is collected and output to the control system. The control system can determine the length of the solid rod of each roughness adjustment mechanism extending into the pipe. Then, the control system controls the magnitude of the magnetic repulsion force of the electromagnet in each roughness adjustment mechanism, thereby controlling the length of the solid rod extending into the pipe. This results in the same roughness structure on the inner wall of the pipe as the actual construction site being simulated, providing an accurate simulation environment for subsequent ventilation experiments. Furthermore, the roughness of the pipe can be adjusted by changing the length of the solid rod as needed, thereby obtaining ventilation data under different roughness conditions.

[0032] 2. In this invention, multiple interlayer pipes and a control system work together. When connecting pipes, the control system opens an electromagnet to make the flanges of two adjacent interlayer pipes magnetically contact each other and extend the flexible sealing cover to seal, thus achieving a quick connection between adjacent interlayer pipes. After the ventilation test is completed, the electromagnet is closed and the spring can drive the flange to reset, realizing the quick disassembly and separation of each interlayer pipe, which is convenient for subsequent transportation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the connection process of the present invention;

[0034] Figure 2 This is a schematic diagram of the roughness adjustment mechanism in this invention;

[0035] Figure 3 This is a schematic diagram of the roughness adjustment process in this invention.

[0036] In the diagram: 1: sandwiched pipe; 2: flange two; 3: flange one; 4: spring one; 5: flexible sealing cover; 6: magnetic controller; 7: spring two; 8: main unit; 9: sealing sponge; 10: solid rod; 11: fixed base; 12: moving plate; 13: electromagnet two. Detailed Implementation

[0037] The present invention will be further described below.

[0038] like Figure 1 As shown, a portable and adjustable roughness pipe includes multiple interlayer pipes 1, multiple roughness adjustment mechanisms and a control system, wherein each interlayer pipe 1 is provided with multiple roughness adjustment mechanisms.

[0039] One end of the interlayer pipe 1 is fixed with a flange 3, and the other end is equipped with a retractable connecting mechanism. The flange 3 is made of magnetic material. The retractable connecting mechanism includes a flange 2, an electromagnet, multiple springs 4, and a flexible sealing cover 5. The flange 2 is movably connected to the other end of the interlayer pipe 1 through multiple springs 4, allowing the flange 2 to move relative to the other end of the interlayer pipe 1. The flexible sealing cover 5 wraps around multiple springs 4, and its two ends are respectively sealed to the flange 2 and the other end of the interlayer pipe 1. The flexible sealing cover 5 can extend or fold as the flange 2 moves. The electromagnet is mounted on the flange 2. When the two interlayer pipes 1 are connected, the electromagnet of one interlayer pipe 1 is activated, so that the magnetic attraction force generated between it and the flange 3 of the other interlayer pipe 1 is greater than the deformation force of the spring 4. At this time, the flange 2 continuously moves closer to the flange 3 until it is pressed into contact. The contact surface between the flange 2 and the flange 3 is equipped with sealing sponge 9 to improve the sealing performance after the two are pressed into contact.

[0040] The sandwiched pipe 1 is composed of an inner pipe and an outer pipe nested together, forming a sandwich between them; for example Figure 2 As shown, the roughness adjustment mechanism includes a fixed base 11, an electromagnet 13, a movable plate 12, a solid rod 10, and a spring 7. The fixed base 11 is fixed inside the interlayer, and the spring 7 is installed between the movable plate 12 and the fixed base 11 to allow the movable plate 12 to move relative to the fixed base 11. Through holes are formed in the inner tube, and the number of through holes is the same as the number of solid rods 10. Each through hole is sealed by a solid rod 10 to prevent airflow from entering the interlayer through the through holes during ventilation experiments, thus preventing data distortion. One end of the solid rod 10 extends into the through hole, and the other end is fixed to the movable plate 12. The movable plate 12 is made of magnetic material (i.e., the magnetic pole of the movable plate 12 facing the electromagnet 13 is the same as the magnetic pole of the electromagnet 13 after it is energized, for example, both are N poles or S poles; this ensures that the movable plate 12 is subjected to magnetic repulsion force after the electromagnet 13 is energized). The electromagnet 13 is mounted on the fixed base 11. When the spring 7 is not under force, the inner wall of the inner tube is flush with one end of the solid rod 10, such as... Figure 3 As shown, when roughness adjustment is required, electromagnet 13 is turned on, and the magnetic repulsive force on the moving plate 12 is greater than the deformation force of spring 7. At this time, the moving plate 12 drives one end of the solid rod 10 to extend into the inner tube through the through hole.

[0041] The control system includes a magnetic controller 6 and a host 8. The host 8 is connected to electromagnet 1 and is used to control the opening and closing of electromagnet 1. The host 8 is connected to electromagnet 2 13 through the magnetic controller 6 and is used to control the magnitude of the magnetic force generated by electromagnet 2 13.

[0042] As an improvement of this invention, flange 3 is made of a ferromagnetic material, such as iron, cobalt, or nickel. This material is readily available and structurally stable, achieving the desired magnetic attraction effect during use, effectively reducing production costs while ensuring the stability of the pipe connection. Springs 1 and 2 are both tension springs. Tension springs have a better ability to reset tensile forces, ensuring a better reset effect.

[0043] The specific steps for using the aforementioned portable and adjustable-roughness pipe are as follows:

[0044] Step 1: Pipe Assembly and Disassembly: During pipe assembly, first determine the required number of interlayer pipes 1. Then, place all interlayer pipes 1 in a straight line with a certain distance between them. Initially, the springs of each interlayer pipe 1 are in an unstretched state, and the flexible sealing cover 5 is folded. The main unit 8 controls the electromagnet 1 to open. At this time, the electromagnet 1 generates magnetic force, making the magnetic attraction between the electromagnet 1 of each interlayer pipe 1 and the flange 3 of the adjacent interlayer pipe 1 greater than the deformation force of the spring 1. The spring 1 then stretches and increases the deformation force, and the flange 2 continuously moves closer to the flange 3 until it is compressed. The flexible sealing cover 5 moves and extends with flange 2 to seal the two sandwich pipes 1, completing the pipe assembly process. During the subsequent ventilation test, the electromagnet 1 is kept in the open state. When the pipe is disassembled, the host 8 controls the electromagnet 1 to close. At this time, the magnetic attraction between the electromagnet 1 and the adjacent sandwich pipe 1 disappears. The flange 2 of each sandwich pipe 1 begins to move away from the flange 3 under the deformation force of the spring 1 until the spring 1 returns to its initial state. At the same time, the flexible sealing cover 5 moves and folds with flange 2, completing the pipe disassembly, which is convenient for subsequent transportation or replacement of sandwich pipes.

[0045] Step 2: Determine the insertion length of the solid rod in this simulation: First, obtain the required surface roughness data for the simulated wall. Use a surface roughness meter to measure and calculate four data points: the arithmetic mean roughness Ra, the root mean square roughness Rq, the average height of ten points Rz, and the maximum peak distance Rmax of the simulated wall. Record the changes in the instrument tip height to draw the surface profile. The relevant calculation formulas are as follows:

[0046] I. Arithmetic mean roughness:

[0047] Where: Y i is the vertical distance from the (i)th point on the surface profile to the baseline, and n is the number of data points within the sampling length;

[0048] II. Root mean square roughness:

[0049] Where: Y iis the vertical distance from the (i)th point on the surface profile to the baseline, and n is the number of data points within the sampling length;

[0050] III. Average height at ten points:

[0051] Where: P i V is the height of the i-th peak. j It is the depth of the j-th valley;

[0052] IV. The steps for calculating the maximum peak distance Rmax are as follows:

[0053] ① Select a sufficiently long evaluation length on the surface to be tested, which includes several consecutive sampling lengths;

[0054] ② Draw the surface contour line along this evaluation length. This line represents the change in height of the surface in the vertical direction.

[0055] ③ Identify the highest point (peak) and the lowest point (valley) from the surface profile;

[0056] ④ Measure the vertical distance between these two points, that is, the distance from the peak to the valley, to obtain the maximum peak distance Rmax;

[0057] After summarizing the four data obtained above, input them into host 8. After processing the input data, host 8 determines the insertion length of the solid rod 10 of each roughness adjustment mechanism in the inner tube of each interlayer pipe 1.

[0058] Step 3: Changing the roughness of the pipe: Initially, one end of all solid rods 10 is flush with the inner wall of the inner pipe, which is smooth at this time. When it is necessary to change the roughness of the pipe wall, the main unit 8 controls the magnetic force of the electromagnets 13 of each roughness adjustment mechanism through the magnetic controller 6 according to the extension length of each solid rod 10 determined in Step 2. The moving plate 12 of each roughness adjustment mechanism is driven by the magnetic repulsion force to extend one end of the solid rod 10 into the inner pipe through the through hole. The extension length of each solid rod 10 is controlled according to the magnitude of the magnetic repulsion force, so that the inner wall of the pipe presents the same roughness structure as the actual construction site to be simulated, providing an accurate simulation environment for subsequent ventilation experiments. Finally, after the ventilation experiment, the ventilation data under the current roughness condition is obtained. After completion, the electromagnets 13 are turned off. At this time, the magnetic repulsion force disappears, and the moving plate 12 is driven by the deformation and reset force of the spring 7 to retract one end of the solid rod 10 into the through hole, completing the reset process and facilitating the next use.

[0059] Step 4: Obtain ventilation test data under different conditions: Repeat step 2 to obtain the insertion length of each solid rod 10 corresponding to other required simulation positions, or set different roughness and use the process in step 2 to obtain the insertion length of each solid rod 10. Repeat step 3 respectively to obtain ventilation data under different roughness conditions.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A portable, installable pipe with adjustable roughness, characterized in that, It includes multiple interlayer pipes, multiple roughness adjustment mechanisms and a control system, with multiple roughness adjustment mechanisms installed in each interlayer pipe; The sandwiched pipe has a flange 1 fixed at one end and a telescopic connecting mechanism at the other end. The flange 1 is made of magnetic material. The telescopic connecting mechanism includes a flange 2, an electromagnet 1, multiple springs 1, and a flexible sealing cover. The flange 2 is movably connected to the other end of the sandwiched pipe through multiple springs 1, allowing the flange 2 to move relative to the other end of the sandwiched pipe. The flexible sealing cover wraps around multiple springs 1, and its two ends are respectively sealed to the flange 2 and the other end of the sandwiched pipe. The flexible sealing cover can extend or fold as the flange 2 moves. The electromagnet 1 is mounted on the flange 2. When the two sandwiched pipes are connected, the electromagnet 1 of one sandwiched pipe is activated, so that the magnetic attraction force generated between it and the flange 1 of the other sandwiched pipe is greater than the deformation force of the spring 1. At this time, the flange 2 moves closer and closer to the flange 1 until it is pressed into contact. The sandwiched pipe consists of an inner tube and an outer tube nested together, forming a sandwich between them. The roughness adjustment mechanism includes a fixed base, an electromagnet, a movable plate, a solid rod, and a spring. The fixed base is fixed inside the sandwiched pipe, and the spring is installed between the movable plate and the fixed base to allow the movable plate to move relative to the fixed base. A through hole is opened on the inner tube, and one end of the solid rod extends into the through hole, while the other end is fixed to the movable plate. The movable plate is made of magnetic material, and the electromagnet is installed on the fixed base. When the spring is not under force, the inner wall of the inner tube is flush with one end of the solid rod. When roughness adjustment is required, the electromagnet is activated, and the magnetic repulsive force on the movable plate is greater than the deformation force of the spring. At this time, the movable plate drives one end of the solid rod to extend into the inner tube through the through hole. The number of through holes on the inner tube is the same as the number of solid rods. The control system includes a magnetic controller and a main unit. The main unit is connected to electromagnet one and is used to control the opening and closing of electromagnet one. The main unit is connected to electromagnet two through the magnetic controller and is used to control the magnitude of the magnetic force generated by electromagnet two.

2. The portable and adjustable roughness pipe according to claim 1, characterized in that, The flange is made of ferromagnetic material.

3. The portable and adjustable roughness pipe according to claim 1, characterized in that, The contact surfaces of flange two and flange one are surrounded by sealing sponge, which is used to improve the sealing performance after the two are pressed into contact.

4. The portable and adjustable roughness pipe according to claim 1, characterized in that, Both spring one and spring two are tension springs.

5. A method of using a portable, adjustable-roughness pipe according to any one of claims 1 to 4, characterized in that, The specific steps are as follows: Step 1: Pipe Assembly and Disassembly: When assembling the pipes, first determine the required number of interlayer pipes. Then, arrange all interlayer pipes in a straight line with a certain distance between them. Initially, spring 1 of each interlayer pipe is in an unstretched state, and the flexible sealing cover is folded. The main unit controls electromagnet 1 to open, generating magnetic force. This causes the magnetic attraction between electromagnet 1 of each interlayer pipe and flange 1 of the adjacent interlayer pipe to exceed the deformation force of spring 1. Spring 1 then stretches and increases its deformation force, and flange 2 moves closer to flange 1 until they are pressed into contact. Simultaneously, the flexible sealing cover extends with flange 2, sealing the two interlayer pipes and completing the pipe assembly process. During subsequent ventilation experiments, electromagnet 1 remains open. When disassembling the pipes, the main unit controls electromagnet 1 to close. The magnetic attraction between electromagnet 1 and the adjacent interlayer pipes disappears. Flange 2 of each interlayer pipe, under the deformation force of spring 1, begins to move away from flange 1 until spring 1 returns to its initial state. Simultaneously, the flexible sealing cover folds with flange 2, completing the pipe disassembly and facilitating subsequent transportation or replacement of the interlayer pipes. Step 2: Determine the insertion length of the solid rod in this simulation: First, obtain the required surface roughness data for the simulated wall. Use a surface roughness meter to measure and calculate four data points: the arithmetic mean roughness Ra, the root mean square roughness Rq, the average height of ten points Rz, and the maximum peak distance Rmax of the simulated wall. Record the changes in the instrument tip height to draw the surface profile. The relevant calculation formulas are as follows: I. Arithmetic mean roughness: ; Where: Y i is the vertical distance from the i-th point on the surface profile to the baseline, and n is the number of data points within the sampling length; II. Root mean square roughness: ; Where: Y i is the vertical distance from the i-th point on the surface profile to the baseline, and n is the number of data points within the sampling length; III. Average height at ten points: ; Where: P i V is the height of the i-th peak. j It is the depth of the j-th valley; IV. The steps for calculating the maximum peak distance Rmax are as follows: ① Select an evaluation length on the surface to be tested. The evaluation length includes several consecutive sampling lengths. ② On the evaluation length, draw the surface contour line, which represents the height change of the surface under test in the vertical direction; ③ Identify the highest point (peak) and the lowest point (valley) from the surface profile; ④ Measure the vertical distance between these two points, that is, the distance from the peak to the valley, to obtain the maximum peak distance Rmax; After summarizing the four data obtained above, input them into the host. After processing the input data, the host determines the insertion length of the solid rod of each roughness adjustment mechanism in the inner tube of each interlayer pipe. Step 3: Changing the roughness of the pipe: Initially, one end of all solid rods is flush with the inner wall of the inner pipe, which is smooth at this time. When it is necessary to change the roughness of the pipe wall, the main unit controls the magnetic force of the electromagnet of each roughness adjustment mechanism through the magnetic controller according to the insertion length of each solid rod determined in Step 2. The moving plate of each roughness adjustment mechanism is driven by magnetic repulsion to insert one end of the solid rod into the inner pipe through the through hole. The insertion length of each solid rod is controlled according to the magnitude of the magnetic repulsion force it receives. This results in the same roughness structure of the pipe wall as the actual construction site to be simulated, providing an accurate simulation environment for subsequent ventilation experiments. Finally, ventilation data under the current roughness condition is obtained after the ventilation experiment. Step 4: Obtain ventilation test data under different conditions: Repeat step 2 to obtain the insertion length of each solid rod corresponding to other required simulation positions, or set different roughness and use the process in step 2 to obtain the corresponding insertion length of each solid rod. Repeat step 3 respectively to obtain ventilation data under different roughness conditions.

Images