A multi-point measuring device for cylinder wall thickness

Abstract

This invention discloses a multi-point measuring device for cylinder wall thickness, belonging to the field of wall thickness measurement technology. It includes a support platform, a first column, a second column, and a measuring mechanism. The support platform has a V-shaped groove, with rollers rotatably mounted on both sides of the groove. A first power component is provided on the support platform to drive one set of rollers to rotate. This invention relies on a timer in the measuring component to determine the time from laser beam emission to reception. Based on the states of the two movable rods contacting each other and the movable rods contacting the cylinder, the change in displacement of the movable rods is measured twice, thereby calculating the wall thickness of the cylinder. The operation is simple and convenient, and it can perform multi-point measurements on the cylinder. Furthermore, the two sets of measuring components can simultaneously detect the wall thickness at two positions along the same axis of the cylinder, making the measured wall thickness data more accurate and reliable, and increasing measurement efficiency.

Description

Technical Field

[0001] This invention discloses a multi-point measuring device for cylindrical wall thickness, belonging to the field of wall thickness measurement technology. Background Technology

[0002] The function of the cylinder is to provide the pressure-bearing space required by the process, and it is one of the most important pressure-bearing components of a pressure vessel. Its inner diameter and volume often need to be determined by process calculations. Cylindrical cylinders (i.e., round cylinders) and spherical cylinders are the most commonly used cylinder structures in engineering. For cylinders with larger diameters, steel plates can be rolled into cylinders on a plate rolling machine or pressed into two semi-cylinders on a hydraulic press, and then welded together to form a complete cylinder. In some precision equipment, there are high requirements for the wall thickness of the cylinder. Due to the limitations of the processing method, the wall thickness needs to be measured after the cylinder is produced. However, because there are currently no measuring devices for cylinders, it is not possible to quickly and effectively measure the cylinder. Relying solely on manual measurement of the wall thickness at both ends of the cylinder provides too limited data. Since the wall thickness in the middle of the cylinder cannot be measured, the data obtained is prone to errors and is not accurate enough, resulting in limited reference value. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art and to provide a multi-point measuring device for cylinder wall thickness.

[0004] This invention achieves the above-mentioned objective through the following technical solution: a multi-point measuring device for cylinder wall thickness, comprising a support platform, a first column, a second column, and a measuring mechanism. The support platform has a V-shaped groove. Two sets of screws and guide seats are installed between the first and second columns. The screws have two sections of threads with opposite directions. The measuring mechanism is provided in two sets, each set including two sets of measuring components. The measuring components include a slide, a movable rod, a limiting component, a battery, a laser emitter, a laser receiver, and a timer. The slide has a sealing cavity and a mounting cavity. One end of the movable rod is slidably disposed in the sealing cavity and has a sealing ring. The other end of the movable rod has a hemispherical structure. The laser emitter and laser receiver are installed at the bottom of the mounting cavity. One end of the limiting member is located inside the mounting cavity and is equipped with a reflector. The other end of the limiting member is connected to the movable rod and applies an abutment force to the movable rod against the slide. The laser emitter, laser receiver, and timer are all coupled to a battery. The timer is used to measure the time from laser beam emission to reception. The two movable rods in the same set of measuring components are arranged close to each other, and the line connecting the apexes of the two movable rods passes through the midpoint of the line connecting the centers of the two rollers on both sides of the groove. The slide is equipped with a vent pipe communicating with the sealing cavity. The first and second columns are also equipped with a second power assembly for driving the two screws to rotate synchronously.

[0005] Preferably, the slide includes a base and a sealing seat, the mounting cavity and the sealing cavity are disposed in the sealing seat, the battery is installed in the base, the sealing seat is provided with a wire hole, the mounting cavity is provided with a mounting plate, the laser emitter and the laser receiver are fixed on the mounting plate, and the guide seat has a sliding groove for the base to slide.

[0006] Preferably, the limiting component includes a limiting bolt and a spring, the middle part of the movable rod is provided with an annular protrusion, one end of the limiting bolt passes through the sealing seat and is fixedly connected to the annular protrusion, the spring is sleeved on the outside of the limiting bolt and applies a force close to the mounting plate to the limiting bolt, and the reflector is fixed on the limiting bolt.

[0007] Preferably, rollers are rotatably provided on both sides of the groove, and a first power assembly for driving one set of rollers to rotate is provided on the support platform. The first power assembly includes a first motor, a first pulley and a first belt. A fixed shaft connects the multiple rollers located on the same side of the groove. There are two first pulleys, which are respectively fixed on the fixed shaft and the output shaft of the first motor. The first belt is sleeved on the outside of the first pulley.

[0008] Preferably, the second power assembly includes a second motor, a second pulley, and a second belt. The second motor is mounted on the first column, and the output shaft of the second motor is fixedly connected to one of the screws. There are two second pulleys, which are mounted on the ends of the two screws near the second column. The second belt is sleeved on the outside of the two second pulleys.

[0009] Preferably, the second column is provided with a first positioning post and a second positioning post. There are two first positioning posts, and the first positioning posts are rotatably connected to the second column. One end of the first positioning post has a limiting boss that slides with the screw, and the other end is fixedly connected to the second pulley by a bolt. There are four second positioning posts, which are fixed to the second column by bolts. One end of two second positioning posts is embedded in the same guide seat. The end of the guide seat away from the second column is fixedly connected to the first column by bolts. One of the screws is rotatably connected to the first column away from the second column, and the screw is connected to the limiting post by bolts. A vent pipe is installed on the air guide pipe, and the four vent pipes are respectively installed through the first column and the second column.

[0010] Preferably, the device further includes a data processor and an alarm. The data processor includes a data receiving unit, a data calculation unit, and a comparison unit. The data receiving unit is coupled to a timer and receives two times recorded by a counter in the same set of measuring mechanisms. The data calculation unit is coupled to the data receiving unit and is used to calculate the change in displacement of the two moving rods, thereby calculating the wall thickness at the cylinder measurement point. The comparison unit is coupled to the data calculation unit and compares the wall thickness value at the cylinder measurement point with the standard wall thickness value of the cylinder. When the difference between the measured wall thickness value and the standard wall thickness value exceeds the tolerance range of the cylinder wall thickness, the alarm issues a warning signal.

[0011] Preferably, the method for measuring the wall thickness of the cylinder includes the following steps:

[0012] S1: Place the cylinder to be tested on the support platform, and drive the roller to rotate by the first power component, so that the roller drives the cylinder to rotate according to the preset conditions;

[0013] S2: The second power component drives the two sets of measuring components to move to a position close to the first column and the second column, and then gas is introduced into the sealed cavity until the tops of the two movable rods in the same set of measuring mechanisms touch. At this time, the timer records the two times t1 and t2 from the emission to the reception of the laser beam in the same set of measuring mechanisms. After the first measurement is completed, the gas in the sealed cavity is discharged.

[0014] S3: The second power component drives the two sets of measuring components to move to the inner and outer sides of the cylinder to be measured. Then, gas is continuously introduced into the sealed cavity until the apexes of the two moving rods in the same set of measuring mechanisms touch the inner and outer walls of the cylinder respectively. At this time, the timer records the two times t3 and t4 from the emission to the reception of the laser beam in the same set of measuring mechanisms. After the second measurement is completed, the gas in the sealed cavity is discharged.

[0015] S4: The data processor calculates the wall thickness δ1 = (t1 + t2 - t3 - t4) × V / 2 at the cylinder measurement point. When the difference between the measured wall thickness δ1 and δ0 exceeds the tolerance range of the cylinder wall thickness, the alarm will issue a warning signal, where V is the known laser beam propagation speed and δ0 is the standard wall thickness of the cylinder.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By setting up a support platform, a measuring component, and a second power component, the measuring component is driven to slide horizontally by the second power component, and the timer measures and records the time from laser beam emission to reception twice, thereby calculating the change in displacement of the two moving rods in the same measuring mechanism, and thus obtaining the wall thickness of the cylinder measuring point. The operation is simple and convenient.

[0018] 2. By setting up a first power component, the first power component can drive the roller to rotate. Relying on the friction between the roller and the cylinder, the cylinder is driven to rotate. This allows for multi-point measurement of the wall thickness at different positions along the circumference of the cylinder, resulting in higher measurement efficiency. At the same time, the two sets of measuring mechanisms can simultaneously measure the wall thickness at two positions along the axial direction of the cylinder, making the measured wall thickness data more accurate and reliable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a multi-point measuring device for cylinder wall thickness according to the present invention;

[0020] Figure 2 This is a cross-sectional view of a multi-point measuring device for cylinder wall thickness according to the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the slide and the movable rod in this invention;

[0022] Figure 4 This is a schematic diagram of the internal structure of the slide block in this invention;

[0023] Figure 5 This is a schematic diagram of the structure of the second column, the first positioning column, and the second positioning column in this invention;

[0024] Figure 6 This is a schematic diagram of the structure of the support platform and the first power assembly in this invention;

[0025] Reference numerals in the attached drawings: 1. Support platform; 2. Second column; 3. Second power assembly; 4. Guide seat; 5. Measuring assembly; 6. Screw; 7. Slide groove; 8. Limiting post; 9. First column; 10. Cylinder; 11. First power assembly; 12. Second pulley; 13. Second belt; 14. Vent pipe; 15. First positioning post; 16. Movable rod; 17. Slide seat; 18. Second motor; 19. Limiting bolt; 20. Ring protrusion; 21. Air duct; 22. Sealing seat; 23. Base; 24. Spring; 25. Reflector; 26. Laser emitter; 27. Laser receiver; 28. Mounting plate; 29. ​​Battery; 30. Mounting cavity; 31. Sealing cavity; 32. Sealing ring; 33. Second positioning post; 34. Limiting boss; 35. Groove; 36. First motor; 37. Fixed shaft; 38. First belt; 39. First pulley; 40. Roller. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figures 1-6 As shown, a multi-point measuring device for cylinder wall thickness includes a support platform 1, a first column 9, a second column 2, and a measuring mechanism. The support platform 1 has a V-shaped groove 35. The first column 9 and the second column 2 are installed on both sides of the support platform 1, and two sets of screws 6 and guide seats 4 are installed between the first column 9 and the second column 2. The two sets of screws 6 and guide seats 4 are arranged vertically. The screws 6 have two sections of threads with opposite directions. The measuring mechanism is provided in two sets, each set including two sets of measuring components 5. The measuring components 5 include a slide 17, a movable rod 16, a limiting component, a battery 29, a laser emitter 26, a laser receiver 27, and a timer. The slide 17 is provided with a sealing cavity 31 and a mounting cavity 30. One end of the movable rod 16 is slidably disposed in the sealing cavity 31, and the movable rod 16 has a sealing ring 32. The other end of the movable rod 16 is a hemispherical structure. The structure includes a laser emitter 26 and a laser receiver 27 mounted at the bottom of the mounting cavity 30. One end of a limiting member is located inside the mounting cavity 30 and is equipped with a reflector 25. The other end of the limiting member is connected to a movable rod 16 and applies a force to the movable rod 16 against the slide 17. A battery 29 is installed inside the slide 17. The laser emitter 26, the laser receiver 27, and the timer are all coupled to the battery 29. The timer is used to measure the time from laser beam emission to reception. The two movable rods 16 in the same set of measuring components 5 are arranged close to each other, and the line connecting the two movable rods 16 at their close ends passes through the midpoint of the line connecting the centers of the two rollers 40 on both sides of the groove 35. A vent pipe 21 communicating with the sealing cavity 31 is provided on the slide 17. A second power component 3 for driving the two screws 6 to rotate synchronously is also provided on the first column 9 and the second column 2.

[0028] The slide 17 includes a base 23 and a sealing seat 22. The mounting cavity 30 and the sealing cavity 31 are disposed in the sealing seat 22. The battery 29 is installed in the base 23. The sealing seat 22 is provided with a wire hole. The mounting cavity 30 is provided with a mounting plate 28. The laser emitter 26 and the laser receiver 27 are fixed on the mounting plate 28. The guide seat 4 has a sliding groove 7 for the base 23 to slide. The slide 17 is configured as a split structure, which can facilitate the installation of the measuring component 5. At the same time, the wires connecting the laser emitter 26 and the laser receiver 27 can pass through the wire hole and be connected to the battery 29.

[0029] The limiting components include a limiting bolt 19 and a spring 24. A ring protrusion 20 is provided in the middle of the movable rod 16. One end of the limiting bolt 19 passes through the sealing seat 22 and is fixedly connected to the ring protrusion 20. The spring 24 is sleeved on the outside of the limiting bolt 19 and applies a force close to the mounting plate 28 to the limiting bolt 19. The reflector 25 is fixed on the limiting bolt 19. The spring 24 can keep the ring protrusion 20 in contact with the sealing seat 22. When gas is introduced into the sealing cavity 31, the gas pressure in the sealing cavity 31 increases, thereby pushing the movable rod 16 and the limiting bolt 19 to slide, so that the spring 24 is compressed. This allows one end of the two movable rods 16 to contact each other or one end of the movable rod 16 to contact the cylinder 10. When the gas in the sealing cavity 31 is discharged, the spring 24 will drive the limiting bolt 19 and the movable rod 16 to reset.

[0030] Rollers 40 are rotatably mounted on both sides of the groove 35. A first power assembly 11 is mounted on the support platform 1 to drive one set of rollers 40 to rotate. The first power assembly 11 includes a first motor 36, a first pulley 39, and a first belt 38. A fixed shaft 37 connects the multiple rollers 40 located on the same side of the groove 35. There are two first pulleys 39, which are fixed on the fixed shaft 37 and the output shaft of the first motor 36, respectively. The first belt 38 is sleeved on the outside of the first pulleys 39. The first motor 36 drives the fixed shaft 37 to rotate by the two first pulleys 39 and the first belt 38, which causes the rollers 40 on the fixed shaft 37 to rotate. This drives the cylinder 10 to rotate, thereby facilitating the measurement assembly 5 to perform multi-point wall thickness measurement on the circumference of the cylinder 10.

[0031] The second power assembly 3 includes a second motor 18, a second pulley 12, and a second belt 13. The second motor 18 is mounted on the first column 9, and the output shaft of the second motor 18 is fixedly connected to one of the screws 6. There are two second pulleys 12, which are installed on the two screws 6 near the second column 2. The second belt 13 is sleeved on the outside of the two second pulleys 12. The second motor 18 drives one of the screws 6 to rotate, and the other screw 6 can be driven to rotate by the two second pulleys 12 and the belt. In this way, the two screws 6 can rotate synchronously, so that the slide 17 and the movable rod 16 in the same measuring assembly 5 can maintain synchronous horizontal movement. The same screw 6 has two sections of threads with opposite directions of rotation. When the screw 6 rotates, it can make the two sets of measuring assemblies 5 move in a direction that is closer to each other or further away from each other. In this way, the wall thickness of the cylinder 10 can be measured at two positions in the axial direction at the same time.

[0032] The second column 2 is provided with a first positioning post 15 and a second positioning post 33. There are two first positioning posts 15, which are rotatably connected to the second column 2. One end of the first positioning post 15 has a limiting boss 34 that slides with the screw 6, and the other end is fixedly connected to the second pulley 12 by bolts. There are four second positioning posts 33, which are fixed to the second column 2 by bolts. One end of two second positioning posts 33 is embedded in the same guide seat 4. The end of the guide seat 4 away from the second column 2 is fixedly connected to the first column 9 by bolts. One end of the screw 6 away from the second column 2 is rotatably connected to the first column 9, and the screw 6 is connected to a limiting post by bolts. 8. A ventilation pipe 14 is installed on the air guide pipe 21. The four ventilation pipes 14 pass through the first column 9 and the second column 2 respectively. With this technical solution, the first positioning column 15 and the second positioning column 33 are slidably set with the screw 6 and the guide seat 4 respectively. During the disassembly and assembly of the cylinder 10, since the first positioning column 15 and the second positioning column 33 are installed on the second column 2, by removing the second column 2 from the support platform 1 and removing the air guide pipe 21 and the ventilation pipe 14, the screw 6 and the guide seat 4 can be kept in a suspended state, while the measuring component 5 is still installed on the guide seat 4 and the screw 6. This design can facilitate the quick replacement of the cylinder 10 to facilitate the measurement of different cylinder wall thicknesses.

[0033] It also includes a data processor and an alarm. The data processor includes a data receiving unit, a data calculation unit, and a comparison unit. The data receiving unit is coupled to a timer and receives two times recorded by a counter in the same set of measuring mechanisms. The data calculation unit is coupled to the data receiving unit and is used to calculate the change in displacement of the two movable rods 16, thereby calculating the wall thickness at the measuring point of the cylinder 10. The comparison unit is coupled to the data calculation unit and compares the wall thickness value at the measuring point of the cylinder 10 with the standard wall thickness value of the cylinder 10. When the difference between the measured wall thickness value of the cylinder 10 and the standard wall thickness value of the cylinder 10 exceeds the tolerance range of the wall thickness of the cylinder 10, the alarm issues a warning signal. The method for measuring the wall thickness of the cylinder 10 includes the following steps:

[0034] S1: Place the cylinder 10 to be tested on the support platform 1, and drive the roller 40 to rotate by the first power component 11, so that the roller 40 drives the cylinder 10 to rotate according to the preset conditions;

[0035] S2: The second power component 3 drives the two sets of measuring components 5 to move to a position close to the first column 9 and the second column 2, and then gas is introduced into the sealed cavity 31 until the apexes of the two movable rods 16 in the same set of measuring mechanisms touch. At this time, the timer records the two times t1 and t2 from the emission to the reception of the laser beam in the same set of measuring mechanisms. After the first measurement is completed, the gas in the sealed cavity 31 is discharged.

[0036] S3: The second power component 3 drives the two sets of measuring components 5 to move to the inner and outer sides of the cylinder 10 to be measured. Then, gas is continuously introduced into the sealed cavity 31 until the apexes of the two movable rods 16 in the same measuring mechanism touch the inner and outer walls of the cylinder 10 respectively. At this time, the timer records the two times t3 and t4 from the emission to the reception of the laser beam in the same measuring mechanism. After the second measurement is completed, the gas in the sealed cavity 31 is discharged.

[0037] S4: The data processor calculates the wall thickness δ1 of the cylinder 10 at the measurement point as δ1 = (t1 + t2 - t3 - t4) × V / 2. When the difference between the measured wall thickness values ​​δ1 and δ0 of the cylinder 10 exceeds the tolerance range of the wall thickness of the cylinder 10, the alarm will issue a warning signal, where V is the known laser beam propagation speed and δ0 is the standard wall thickness of the cylinder 10.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-point measuring device for cylinder wall thickness, comprising a support platform, a first column, a second column, and a measuring mechanism, characterized in that, The support platform has a V-shaped groove. Two sets of screws and guide seats are installed between the first and second columns. The screws have two sections of threads with opposite directions. Two sets of measuring mechanisms are provided, each set including two sets of measuring components. Each measuring component includes a slide, a movable rod, a limiting member, a battery, a laser emitter, a laser receiver, and a timer. The slide has a sealed cavity and a mounting cavity. One end of the movable rod is slidably disposed within the sealed cavity and has a sealing ring. The other end of the movable rod has a hemispherical structure. The laser emitter and laser receiver are installed at the bottom of the mounting cavity. One end of the limiting member is located within the mounting cavity and has a reflector. The other end of the limiting member is connected to... The movable rods are connected and exert a force against the slide block. The laser emitter, laser receiver, and timer are all coupled to the battery. The timer is used to measure the time from laser beam emission to reception. Two movable rods in the same set of measuring components are arranged close to each other, and the line connecting the two movable rods at their close ends passes through the midpoint of the line connecting the centers of the two rollers on both sides of the groove. The slide block is provided with a vent pipe communicating with the sealing cavity. The first and second columns are also provided with a second power component for driving the two screws to rotate synchronously. The slide block includes a base and a sealing seat. The mounting cavity and the sealing cavity are located in the sealing seat. The battery is installed in the base. The sealing seat is provided with a wire hole. The mounting cavity is provided with... The system includes a mounting plate on which the laser emitter and receiver are fixed. The guide seat has a sliding groove for the base to slide. Rollers are rotatably mounted on both sides of the groove. A first power assembly for driving one set of rollers is mounted on the support platform. The first power assembly includes a first motor, a first pulley, and a first belt. A fixed shaft connects multiple rollers located on the same side of the groove. Two first pulleys are provided and fixed to the fixed shaft and the output shaft of the first motor, respectively. The first belt is sleeved on the outside of the first pulleys. The second power assembly includes a second motor, a second pulley, and a second belt. The second motor is mounted on a first column, and its output shaft is fixedly connected to one of the screws. Two second pulleys are provided and installed on the ends of two screws near the second column. The second belt is sleeved on the outside of the two second pulleys. The second column is provided with two first positioning posts and two first positioning posts rotatably connected to the second column. One end of each first positioning post has a limiting boss that slides with the screw, and the other end is fixedly connected to the second pulley by bolts. Four second positioning posts are provided and fixed to the second column by bolts. One end of two second positioning posts is embedded in the same guide seat. The end of the guide seat away from the second column is fixedly connected to the first column by bolts. One end of the screw away from the second column is rotatably connected to the first column.Furthermore, the screw is connected to a limit post via bolts, and a vent pipe is installed on the air guide pipe. Four vent pipes are respectively installed through the first and second columns.

2. The multi-point measuring device for cylinder wall thickness according to claim 1, characterized in that, The limiting component includes a limiting bolt and a spring. The middle part of the movable rod is provided with an annular protrusion. One end of the limiting bolt passes through the sealing seat and is fixedly connected to the annular protrusion. The spring is sleeved on the outside of the limiting bolt and applies a force close to the mounting plate to the limiting bolt. The reflector is fixed on the limiting bolt.

3. The multi-point measuring device for cylinder wall thickness according to claim 1, characterized in that, It also includes a data processor and an alarm. The data processor includes a data receiving unit, a data calculation unit, and a comparison unit. The data receiving unit is coupled to a timer and receives two times recorded by a counter in the same set of measuring mechanisms. The data calculation unit is coupled to the data receiving unit and is used to calculate the change in displacement of the two moving rods, thereby calculating the wall thickness at the cylinder measurement point. The comparison unit is coupled to the data calculation unit and compares the wall thickness value at the cylinder measurement point with the standard wall thickness value of the cylinder. When the difference between the measured wall thickness value and the standard wall thickness value exceeds the tolerance range of the cylinder wall thickness, the alarm issues a warning signal.

4. The multi-point measuring device for cylinder wall thickness according to claim 3, characterized in that, The method for measuring the wall thickness of the cylinder includes the following steps: S1: Place the cylinder to be tested on the support platform, and drive the roller to rotate by the first power component, so that the roller drives the cylinder to rotate according to the preset conditions; S2: The second power component drives the two sets of measuring components to move to a position close to the first column and the second column, and then gas is introduced into the sealed cavity until the tops of the two movable rods in the same set of measuring mechanisms touch. At this time, the timer records the two times t1 and t2 from the emission to the reception of the laser beam in the same set of measuring mechanisms. After the first measurement is completed, the gas in the sealed cavity is discharged. S3: The second power component drives the two sets of measuring components to move to the inner and outer sides of the cylinder to be measured. Then, gas is continuously introduced into the sealed cavity until the apexes of the two moving rods in the same set of measuring mechanisms touch the inner and outer walls of the cylinder respectively. At this time, the timer records the two times t3 and t4 from the emission to the reception of the laser beam in the same set of measuring mechanisms. After the second measurement is completed, the gas in the sealed cavity is discharged. S4: The data processor calculates the wall thickness δ1 = (t1 + t2 - t3 - t4) × V / 2 at the cylinder measurement point. When the difference between the measured wall thickness δ1 and δ0 exceeds the tolerance range of the cylinder wall thickness, the alarm will issue a warning signal, where V is the known laser beam propagation speed and δ0 is the standard wall thickness of the cylinder.

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