Cylinder wall thickness multi-point measuring device

Abstract

The invention discloses a cylinder wall thickness multi-point measuring device, and belongs to the technical field of wall thickness measurement, the cylinder wall thickness multi-point measuring device comprises a supporting table, a first stand column, a second stand column and a measuring mechanism, the supporting table is provided with a groove of a V-shaped structure, two side surfaces of the groove are rotatably provided with rollers, and the supporting table is provided with a first power assembly used for driving one group of rollers to rotate; the time from emission to receiving of the laser beam is measured by means of a timer in the measuring assembly, the displacement variation of the movable rods is measured twice in sequence according to the state that the two movable rods abut against each other and the state that the movable rods abut against the barrel, and therefore the wall thickness of the barrel is calculated, operation is easy and convenient, multi-point measurement can be conducted on the barrel, and the measurement accuracy is improved. In addition, the two groups of measuring assemblies can simultaneously detect the wall thickness of two positions of the cylinder in the same axial direction, so that the measured wall thickness data is more accurate and reliable, and the measuring efficiency is higher.

Description

Technical Field

[0001] The invention discloses a multi-point measuring device for cylinder wall thickness, belonging to the technical field of wall thickness measurement. Background Art

[0002] The function of the cylinder is to provide the pressure-bearing space required by the process. It is one of the most important pressure-bearing components of the pressure vessel. Its inner diameter and volume often need to be determined by process calculations. Cylindrical cylinders (i.e., 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. The two are welded together with welds to form a full cylinder. In some precision equipment, there are higher 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 still gaps in the existing cylinder measurement device, the cylinder cannot be measured quickly and effectively. Simply relying on manual measurement of the wall thickness at both ends of the cylinder, the data is too single. Since the wall thickness in the middle of the cylinder cannot be measured, the data obtained in this way has a large error and is not accurate enough, resulting in little reference value for the data. Summary of the invention

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

[0004] The present invention achieves the above-mentioned purpose through the following technical scheme: a multi-point measuring device for the wall thickness of a cylinder, comprising a support platform, a first column, a second column and a measuring mechanism, the support platform having a V-shaped groove, two groups of screws and guide seats are installed between the first column and the second column, the screw has two sections of threads with opposite rotation directions, the measuring mechanism is provided with two groups, each group of the measuring mechanism includes two groups of measuring components, the measuring components include a slide seat, a movable rod, a limiter, a battery, a laser transmitter, a laser receiver and a timer, a sealed cavity and an installation cavity are provided in the slide seat, one end of the movable rod is slidably arranged in the sealed cavity, and a sealing ring is provided on the movable rod, and the other end of the movable rod is a hemispherical structure, the The laser transmitter and the laser receiver are installed at the bottom of the installation cavity. One end of the limiter is located in the installation cavity, and a reflector is arranged on the limiter. The other end of the limiter is connected to the movable rod, and applies a force to the movable rod to resist the sliding seat. The laser transmitter, the laser receiver and the timer are coupled to the battery. The timer is used to measure the time from the emission to the reception of the laser beam. The two movable rods in the same group of measuring components are arranged close to each other, and the line between the vertices of the two movable rods close to each other passes through the midpoint of the line connecting the centers of the two rollers on both sides of the groove. An air duct connected to the sealing cavity is arranged on the sliding seat. The first column and the second column are also provided with a second power component for driving the two screws to rotate synchronously.

[0005] Preferably, the sliding seat includes a base and a sealing seat. The installation cavity and the sealing cavity are arranged in the sealing seat. The storage battery is installed in the base. A wire passing hole is provided on the sealing seat. An installation plate is arranged in the installation cavity. The laser emitter and the laser receiver are fixed on the installation plate. The guide seat has a sliding groove for the base to slide.

[0006] Preferably, the limiting member includes a limiting bolt and a spring. A ring protrusion is arranged in the middle of the movable rod. One end of the limiting bolt passes through the sealing seat and is fixedly connected to the ring protrusion. The spring is sleeved outside the limiting bolt and applies a force to the limiting bolt to approach the installation plate. The reflecting mirror is fixed on the limiting bolt.

[0007] Preferably, rollers are rotatably arranged on both sides of the groove. A first power assembly for driving one group of rollers to rotate is arranged on the support platform. The first power assembly includes a first motor, a first belt pulley and a first belt. Fixed shafts are connected between multiple rollers on the same side of the groove. Two first belt pulleys are provided and are respectively fixed on the fixed shaft and the output shaft of the first motor. The first belt is sleeved outside the first belt pulleys.

[0008] Preferably, the second power assembly includes a second motor, a second belt pulley and a second belt. The second motor is installed on the first column, and the output shaft of the second motor is fixedly connected to one of the screw rods. Two second belt pulleys are provided and are installed at one ends of the two screw rods close to the second column. The second belt is sleeved outside the two second belt pulleys.

[0009] Preferably, a first positioning column and a second positioning column are arranged on the second column. Two first positioning columns are provided, and the first positioning columns are rotatably connected to the second column. One end of the first positioning column has a limiting boss slidably arranged with the screw rod, and the other end is fixedly connected to the second belt pulley through a bolt. Four second positioning columns are provided and are fixed on the second column through bolts. One ends of two second positioning columns are embedded in the same guide seat. One end of the guide seat away from the second column is fixedly connected to the first column through a bolt. One end of one of the screw rods away from the second column is rotatably connected to the first column, and a limiting column is connected to the screw rod through a bolt. The four ventilation pipes respectively penetrate through the first column and the second column. An air duct is installed on the air duct.

[0010] Preferably, it further includes a data processor and an alarm. The data processor includes a data receiving unit, a data calculating unit, and a comparing unit. The data receiving unit is coupled to the timer and receives two times recorded by the counter in the same set of measuring mechanisms. The data calculating unit is coupled to the data receiving unit and is used to calculate the change amount of the displacements of the two movable rods, so as to calculate the wall thickness of the measuring point of the cylinder body. The comparing unit is coupled to the data calculating unit, compares the wall thickness value of the measuring point of the cylinder body with the standard wall thickness value of the cylinder body. When the difference between the measured wall thickness value of the cylinder body and the standard wall thickness value of the cylinder body exceeds the tolerance range of the wall thickness of the cylinder body, the alarm emits a warning signal.

[0011] Preferably, the method for measuring the wall thickness of the cylinder body includes the following steps: S1: Place the cylinder body to be measured on the support table, drive the roller to rotate by the first power assembly, and let the roller drive the cylinder body to rotate according to preset conditions; S2: Drive the two sets of measuring assemblies by the second power assembly to move to positions close to the first column and the second column, and then introduce gas into the sealing cavity until the vertices of the two movable rods in the same set of measuring mechanisms are in contact. At this time, the timer respectively records two times t1 and t2 for the laser beam to be emitted and received in the same set of measuring mechanisms. After the first measurement is completed, let the gas in the sealing cavity be discharged; S3: Drive the two sets of measuring assemblies by the second power assembly to move to the inner and outer sides of the cylinder body to be measured, and then continue to introduce gas into the sealing cavity until the vertices of the two movable rods in the same set of measuring mechanisms are respectively in contact with the inner wall and the outer wall of the cylinder body. At this time, the timer respectively records two times t3 and t4 for the laser beam to be emitted and received in the same set of measuring mechanisms. After the second measurement is completed, let the gas in the sealing cavity be discharged; S4: The data processor calculates the wall thickness δ1 of the measuring point of the cylinder body = (t1 + t2 - t3 - t4) × V / 2. When the difference between the measured wall thickness value δ1 of the cylinder body and δ0 exceeds the tolerance range of the wall thickness of the cylinder body, the alarm emits a warning signal, where V is the known propagation speed of the laser beam and δ0 is the standard wall thickness of the cylinder body.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting the support table, the measuring assembly, and the second power assembly, the second power assembly drives the measuring assembly to slide horizontally, and the timer measures and records the time for the laser beam to be emitted and received twice, so as to calculate the change amount of the displacements of the two movable rods in the same set of measuring mechanisms, and further obtain the wall thickness of the measuring point of the cylinder body. The operation is simple and convenient.

[0013] 2. By setting the first power component, the first power component can drive the roller to rotate. Relying on the friction between the roller and the cylinder body, the cylinder body can be driven to rotate, so that multi-point measurement can be carried out on the wall thickness at different positions in the circumferential direction of the cylinder body, and the measurement efficiency is higher. At the same time, the two measurement mechanisms can measure the wall thickness at two positions in the axial direction of the cylinder body simultaneously, making the measured wall thickness data more accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural view of a device for multi-point measurement of the wall thickness of a cylinder body according to the present invention; Figure 2 is a cross-sectional view of a device for multi-point measurement of the wall thickness of a cylinder body according to the present invention; Figure 3 is a schematic structural view of the sliding seat and the movable rod in the present invention; Figure 4 is a schematic internal structural view of the sliding seat in the present invention; Figure 5 is a schematic structural view of the second upright post, the first positioning post and the second positioning post in the present invention; Figure 6 is a schematic structural view of the support table and the first power component in the present invention; Reference numerals: 1, support table; 2, second upright post; 3, second power component; 4, guide seat; 5, measurement component; 6, screw; 7, chute; 8, limit post; 9, first upright post; 10, cylinder body; 11, first power component; 12, second belt pulley; 13, second belt; 14, ventilation pipe; 15, first positioning post; 16, movable rod; 17, sliding seat; 18, second motor; 19, limit bolt; 20, annular protrusion; 21, air guide pipe; 22, sealing seat; 23, base; 24, spring; 25, reflector; 26, laser emitter; 27, laser receiver; 28, mounting plate; 29, storage battery; 30, mounting cavity; 31, sealing cavity; 32, sealing ring; 33, second positioning post; 34, limit boss; 35, groove; 36, first motor; 37, fixed shaft; 38, first belt; 39, first belt pulley; 40, roller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] As Figures 1-6As shown in the figure, a multi-point measuring device for the wall thickness of a cylinder body includes a support table 1, a first column 9, a second column 2 and a measuring mechanism. The support table 1 has a groove 35 with a V-shaped structure. The first column 9 and the second column 2 are installed on both sides of the support table 1. Two groups of screw rods 6 and guide seats 4 are installed between the first column 9 and the second column 2. The two groups of screw rods 6 and guide seats 4 are arranged vertically. The screw rod 6 has two threads with opposite helix directions. Two groups of measuring mechanisms are provided. Each group of measuring mechanisms includes two groups of measuring components 5. The measuring component 5 includes a sliding seat 17, a movable rod 16, a limiting member, a storage battery 29, a laser emitter 26, a laser receiver 27 and a timer. A sealing cavity 31 and an installation cavity 30 are arranged in the sliding seat 17. One end of the movable rod 16 is slidably arranged in the sealing cavity 31, and a sealing ring 32 is arranged on the movable rod 16. The other end of the movable rod 16 is a hemispherical structure. The laser emitter 26 and the laser receiver 27 are installed at the bottom of the installation cavity 30. One end of the limiting member is located in the installation cavity 30, and a reflecting mirror 25 is arranged on the limiting member. The other end of the limiting member is connected to the movable rod 16 and applies a force to the movable rod 16 to abut against the sliding seat 17. The storage battery 29 is installed in the sliding seat 17. The laser emitter 26, the laser receiver 27 and the timer are all coupled to the storage battery 29. The timer is used to measure the time from the emission to the reception of the laser beam. The two movable rods 16 in the same group of measuring components 5 are arranged to be close to each other, and the connection line between the apexes of the two mutually approaching ends of the two movable rods 16 passes through the midpoint of the connection line of the centers of the two rollers 40 on both sides of the groove 35. An air duct 21 communicating with the sealing cavity 31 is arranged on the sliding seat 17. A second power assembly 3 for driving the two screw rods 6 to rotate synchronously is further arranged on the first column 9 and the second column 2.

[0017] The sliding seat 17 includes a base 23 and a sealing seat 22. The installation cavity 30 and the sealing cavity 31 are arranged in the sealing seat 22. The storage battery 29 is installed in the base 23. A wire passing hole is arranged on the sealing seat 22. An installation plate 28 is arranged in the installation cavity 30. The laser emitter 26 and the laser receiver 27 are fixed on the installation plate 28. The guide seat 4 has a sliding groove 7 for the base 23 to slide. The sliding seat 17 is set as a split structure, which can facilitate the installation of the measuring component 5. At the same time, the wires connected to the laser emitter 26 and the laser receiver 27 can pass through the wire passing hole and then be connected to the storage battery 29.

[0018] The limiting member includes a limiting bolt 19 and a spring 24. A ring convex 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 convex 20. The spring 24 is sleeved outside the limiting bolt 19 and applies a force to the limiting bolt 19 to approach the mounting plate 28. The rearview mirror 25 is fixed on the limiting bolt 19. The spring 24 can keep the ring convex 20 in contact with the sealing seat 22. After gas is introduced into the sealing cavity 31, the air 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. In this way, one end of the two movable rods 16 can be in contact with each other or one end of the movable rod 16 can be in contact with the cylinder body 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.

[0019] Rollers 40 are rotatably arranged on both sides of the groove 35. A first power assembly 11 for driving one group of rollers 40 to rotate is provided on the support table 1. The first power assembly 11 includes a first motor 36, a first belt pulley 39 and a first belt 38. Fixed shafts 37 are connected between multiple rollers 40 on the same side of the groove 35. Two first belt pulleys 39 are provided and are respectively fixed on the fixed shaft 37 and the output shaft of the first motor 36. The first belt 38 is sleeved outside the first belt pulleys 39. The first motor 36 drives the fixed shaft 37 to rotate by relying on the two first belt pulleys 39 and the first belt 38, so that the rollers 40 on the fixed shaft 37 rotate. In this way, the cylinder body 10 can be driven to rotate, so as to facilitate the multi-point wall thickness measurement of the circumference of the cylinder body 10 by the measuring assembly 5.

[0020] The second power assembly 3 includes a second motor 18, a second belt pulley 12 and a second belt 13. The second motor 18 is installed on the first column 9, and the output shaft of the second motor 18 is fixedly connected to one of the screw rods 6. Two second belt pulleys 12 are provided and are installed at one end of the two screw rods 6 close to the second column 2. The second belt 13 is sleeved outside the two second belt pulleys 12. The second motor 18 drives one of the screw rods 6 to rotate, and the other screw rod 6 can be driven to rotate by relying on the two second belt pulleys 12 and the belt. In this way, the two screw rods 6 can rotate synchronously, so that the sliding seat 17 and the movable rod 16 in the same measuring assembly 5 can keep moving horizontally in synchronization. There are two threads with opposite helix directions on the same screw rod 6. When the screw rod 6 rotates, the two measuring assemblies 5 can move towards each other or away from each other, so as to measure the wall thickness at two positions in the axial direction of the cylinder body 10 at the same time.

[0021] The second upright column 2 is provided with a first positioning column 15 and a second positioning column 33. There are two first positioning columns 15, and the first positioning column 15 is rotatably connected to the second upright column 2. One end of the first positioning column 15 has a limiting boss 34 slidably arranged with the screw rod 6, and the other end is fixedly connected to the second belt pulley 12 through a bolt. There are four second positioning columns 33, which are fixedly arranged on the second upright column 2 through bolts. One end of two second positioning columns 33 is embedded into the same guiding seat 4. One end of the guiding seat 4 away from the second upright column 2 is fixedly connected to the first upright column 9 through a bolt. One end of one screw rod 6 away from the second upright column 2 is rotatably connected to the first upright column 9, and the screw rod 6 is connected with a limiting column 8 through a bolt. Four ventilation pipes 14 respectively penetrate through the first upright column 9 and the second upright column 2. The ventilation pipe 14 is installed on the air duct 21. With this technical solution, the first positioning column 15 and the second positioning column 33 are respectively slidably arranged with the screw rod 6 and the guiding seat 4. During the disassembly and assembly of the cylinder body 10, since the first positioning column 15 and the second positioning column 33 are installed on the second upright column 2, by disassembling the second upright column 2 from the support table 1 and disassembling the air duct 21 and the ventilation pipe 14, the screw rod 6 and the guiding seat 4 can be kept in a suspended state, while the measuring assembly 5 is still installed on the guiding seat 4 and the screw rod 6. Such a design can facilitate the quick replacement of the cylinder body 10 to facilitate the measurement of the wall thicknesses of different cylinder bodies 10.

[0022] It further includes a data processor and an alarm. The data processor includes a data receiving unit, a data calculating unit and a comparing unit. The data receiving unit is coupled to the timer and receives two times recorded by the counter in the same set of measuring mechanisms. The data calculating unit is coupled to the data receiving unit and is used for calculating the change amount of the displacements of the two movable rods 16, so as to calculate the wall thickness of the measuring point of the cylinder body 10. The comparing unit is coupled to the data calculating unit and compares the wall thickness value of the measuring point of the cylinder body 10 with the standard wall thickness value of the cylinder body 10. When the difference between the measured wall thickness value of the cylinder body 10 and the standard wall thickness value of the cylinder body 10 exceeds the tolerance range of the wall thickness of the cylinder body 10, the alarm sends out a warning signal. The method for measuring the wall thickness of the cylinder body 10 includes the following steps: S1: Place the cylinder body 10 to be measured on the support table 1, drive the roller 40 to rotate by the first power assembly 11, and let the roller 40 drive the cylinder body 10 to rotate according to the preset conditions; S2: Drive the two sets of measuring assemblies 5 by the second power assembly 3 to move to a position close to the first upright column 9 and the second upright column 2, and then introduce gas into the sealing cavity 31 until the vertices of the two movable rods 16 in the same set of measuring mechanisms are in contact. At this time, the timer respectively records two times t1 and t2 of the laser beam from emission to reception in the same set of measuring mechanisms. After the first measurement is completed, let the gas in the sealing cavity 31 be discharged; S3: Driven by the second power component 3, the two groups of measuring components 5 move to the inner and outer sides of the cylinder 10 to be measured. Then, continue to introduce gas into the sealing cavity 31 until the vertices of the two movable rods 16 in the same group of measuring mechanisms respectively contact the inner wall and the outer wall of the cylinder 10. At this time, the timer respectively records the two times t3 and t4 from the emission to the reception of the laser beam in the same group of measuring mechanisms. After the second measurement, discharge the gas in the sealing cavity 31; S4: The data processor calculates the wall thickness δ1 of the measuring point of the cylinder 10 = (t1 + t2 - t3 - t4) × V / 2. When the difference between the wall thickness value δ1 measured by the cylinder 10 and δ0 exceeds the tolerance range of the wall thickness of the cylinder 10, the alarm issues a warning signal, where V is the known propagation speed of the laser beam and δ0 is the standard wall thickness of the cylinder 10.

[0023] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0024] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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 the wall thickness of a cylinder body, comprising a support table, a first column, a second column and a measuring mechanism, characterized in that, The support platform has a groove with a V-shaped structure. Two sets of screws and guide seats are installed between the first column and the second column. The screw has two threads with opposite helix directions. Two sets of measuring mechanisms are provided. Each set of the measuring mechanisms includes two sets of measuring components. The measuring component includes a sliding seat, a movable rod, a limiting member, a storage battery, a laser emitter, a laser receiver, and a timer. A sealing cavity and an installation cavity are arranged in the sliding seat. One end of the movable rod is slidably arranged in the sealing cavity, and a sealing ring is arranged on the movable rod. The other end of the movable rod is of a hemispherical structure. The laser emitter and the laser receiver are installed at the bottom of the installation cavity. One end of the limiting member is located in the installation cavity, and a reflecting mirror is arranged on the limiting member. The other end of the limiting member is connected to the movable rod and applies a force to the movable rod to abut against the sliding seat. The laser emitter, the laser receiver, and the timer are all coupled to the storage battery. The timer is used to measure the time from the emission to the reception of the laser beam. The two movable rods in the same set of measuring components are arranged to be close to each other, and the connection line between the apexes of the two mutually close ends of the two movable rods passes through the midpoint of the connection line between the centers of the two rollers on both sides of the groove. An air duct communicating with the sealing cavity is arranged on the sliding seat. A second power component for driving the two screws to rotate synchronously is further arranged on the first column and the second column.

2. The multi-point measuring device for the wall thickness of a cylinder according to claim 1, wherein The sliding seat includes a base and a sealing seat. The installation cavity and the sealing cavity are arranged in the sealing seat. The storage battery is installed in the base. A wire passing hole is arranged on the sealing seat. An installation plate is arranged in the installation cavity. The laser emitter and the laser receiver are fixed on the installation plate. The guide seat has a sliding groove for the base to slide.

3. The multi-point measuring device for the wall thickness of a cylinder according to claim 2, characterized in that, The limiting member includes a limiting bolt and a spring. A ring convex is arranged in the middle of the movable rod. One end of the limiting bolt passes through the sealing seat and is fixedly connected to the ring convex. The spring is sleeved outside the limiting bolt and applies a force to the limiting bolt to be close to the installation plate. The reflecting mirror is fixed on the limiting bolt.

4. A multi-point measuring device for the wall thickness of a cylinder according to claim 1, characterized in that, Rollers are rotatably arranged on both sides of the groove. A first power component for driving one set of the rollers to rotate is arranged on the support platform. The first power component includes a first motor, a first belt pulley, and a first belt. Fixed shafts are connected between the multiple rollers on the same side of the groove. Two first belt pulleys are provided and are respectively fixed on the fixed shaft and the output shaft of the first motor. The first belt is sleeved outside the first belt pulleys.

5. The multi-point measuring device for the wall thickness of a cylinder according to claim 1, wherein The second power component includes a second motor, a second belt pulley, and a second belt. The second motor is installed on the first column, and the output shaft of the second motor is fixedly connected to one of the screws. Two second belt pulleys are provided and are installed at one ends of the two screws close to the second column. The second belt is sleeved outside the two second belt pulleys.

6. The multi-point measuring device for the wall thickness of a cylinder according to claim 5, wherein, A first positioning post and a second positioning post are provided on the second vertical post. There are two first positioning posts, and the first positioning posts are rotatably connected to the second vertical post. One end of the first positioning post has a limiting boss that is slidably arranged with the screw rod, and the other end is fixedly connected to the second belt pulley through a bolt. There are four second positioning posts, which are fixed on the second vertical post through bolts. One end of two of the second positioning posts is embedded in the same guiding seat. The end of the guiding seat away from the second vertical post is fixedly connected to the first vertical post through a bolt. One end of the screw rod away from the second vertical post is rotatably connected to the first vertical post, and a limiting post is connected to the screw rod through a bolt. Four air vent pipes respectively penetrate through the first vertical post and the second vertical post, and an air vent pipe is installed on the air guide pipe.

7. A multi-point measuring device for the wall thickness of a cylinder body according to claim 1, characterized in that, It further includes a data processor and an alarm. The data processor includes a data receiving unit, a data calculating unit, and a comparing 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 calculating unit is coupled to the data receiving unit and is used for calculating the change amount of the displacements of two movable rods, so as to calculate the wall thickness of the measuring point of the cylinder body. The comparing unit is coupled to the data calculating unit, compares the wall thickness value of the measuring point of the cylinder body with the standard wall thickness value of the cylinder body. When the difference between the wall thickness value measured of the cylinder body and the standard wall thickness value of the cylinder body exceeds the tolerance range of the wall thickness of the cylinder body, an early warning signal is sent out by the alarm.

8. The multi-point measuring device for the wall thickness of a cylinder according to claim 7, characterized in that, The method for measuring the wall thickness of the cylinder body includes the following steps: S1: Place the cylinder body to be measured on the support table, drive the roller to rotate by the first power assembly, and let the roller drive the cylinder body to rotate according to preset conditions; S2: Drive the two sets of measuring assemblies by the second power assembly to move to positions close to the first vertical post and the second vertical post, and then introduce gas into the sealing cavity until the vertices of the two movable rods in the same set of measuring mechanisms are in contact. At this time, the timer respectively records two times t1 and t2 of the laser beam from emission to reception in the same set of measuring mechanisms. After the first measurement is completed, let the gas in the sealing cavity be discharged; S3: Drive the two sets of measuring assemblies by the second power assembly to move to the inner side and the outer side of the cylinder body to be measured, and then continue to introduce gas into the sealing cavity until the vertices of the two movable rods in the same set of measuring mechanisms are respectively in contact with the inner wall and the outer wall of the cylinder body. At this time, the timer respectively records two times t3 and t4 of the laser beam from emission to reception in the same set of measuring mechanisms. After the second measurement is completed, let the gas in the sealing cavity be discharged; S4: The data processor calculates the wall thickness δ1 of the measuring point of the cylinder body = (t1 + t2 - t3 - t4) × V / 2. When the difference between the measured wall thickness value δ1 of the cylinder body and δ0 exceeds the tolerance range of the wall thickness of the cylinder body, an early warning signal is sent out by the alarm, where V is the known propagation speed of the laser beam, and δ0 is the standard wall thickness of the cylinder body.

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