Tool and method for quickly measuring cylinder axis

Abstract

The present invention relates to the field of measuring the axis of a cylinder, and provides a tool for quickly measuring the axis of a cylinder, comprising: a main body, wherein three bullnose holes are evenly opened along the circumferential direction at the edge of the main body; a laser through hole, wherein the laser through hole is opened at the center of the main body; a laser emitter, wherein the laser emitted by the laser emitter passes through the laser through hole; three pull ropes, wherein one end of each of the three pull ropes is fixed in each of the three bullnose holes; and a pull rope hole, wherein the pull rope hole is opened in the bottom end of the main body, wherein each of the three pull ropes passes through the interior of the main body and extends downward from the pull rope hole to the exterior of the main body. This measuring tool has a simple structure, low production cost, and convenient operation; it can improve the adaptability of the tool and reduce the cost of measurement operations; the adsorption positions of the three adsorption heads can be located sequentially by using the same positioning laser emitter, which can reduce the number of positioning laser emitters, thereby reducing the production cost of the tool.

Description

Technical Field

[0001] The present invention relates to the technical field of cylinder axis measurement, and in particular to a tool and method for quickly measuring the cylinder axis. Background Art

[0002] Coaxiality is simply defined as the degree of deviation between two axes on a part that are required to be aligned. This deviation is typically a combination of three conditions (the reference axis is an ideal straight line): bending, tilt, and offset. Coaxiality error is reflected as the center of the circle on a cross section is not concentric.

[0003] On the other hand, current pressure vessels with structures such as agitators, central tubes, inner cylinders, and nozzles all have coaxial deviation requirements for assembly. Existing measurement tooling has the following drawbacks: Manufacturing and testing typically require the production of dedicated axis measurement tools, which are complex and inefficient. Existing measurement tools are also incapable of adapting to cylinders of varying inner diameters. When measuring cylinders of varying inner diameters, new tools must be used, increasing operational costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a tool and method for quickly measuring the axis of a cylinder, so as to solve the problem that a special axis measuring tool usually needs to be made during manufacturing and inspection, and its measurement method is relatively cumbersome, resulting in low measurement efficiency; the existing measuring tools cannot adapt to cylinders with different inner diameters. When the measurement object is a cylinder with a different inner diameter, a new measuring tool needs to be used, which increases the operating cost.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a tool for quickly measuring the axis of a cylinder, comprising:

[0006] The main body has three bull nose holes evenly arranged on the edge of the main body along the circumferential direction;

[0007] A laser through hole is provided at the center of the main body;

[0008] A laser emitter, wherein a laser line emitted by the laser emitter passes through the laser through-hole;

[0009] Three pull ropes, one end of each of the three pull ropes being fixed in the three bull noses, and each of the three pull ropes passing through the interior of the main body and extending downward to the bottom of the main body;

[0010] Three adsorption heads, the adsorption heads are used to adsorb on the inner wall of the cylinder;

[0011] The first through hole is provided on the adsorption head, and the pull rope is led out from the cow's nostril and passes through the first through hole and then introduced into the cow's nostril.

[0012] Preferably, the main body includes:

[0013] A first cover body, wherein the three bull nose holes are provided at the edge of the first cover body;

[0014] Three rope threading holes, all of which are provided on the first cover body and are connected to the three bull nose holes respectively;

[0015] An arc-shaped through groove, wherein the arc-shaped through groove is provided on the first cover body;

[0016] A drawstring hole is provided on the bottom end of the first cover body, and the drawstring passes through the drawstring hole, the arcuate through groove, and the interior of the drawstring hole in sequence and extends downward to the bottom of the first cover body, and the drawstring hole and the arcuate through groove are interconnected;

[0017] The second cover body is installed on the first cover body, and the rope threading hole, the arc-shaped through groove, and the rope pulling hole are all located between the first cover body and the second cover body.

[0018] Preferably, it also includes:

[0019] a first connecting hole, the first connecting hole being provided on the first cover;

[0020] The second connecting hole is provided on the second cover body, and the first connecting hole and the second connecting hole are connected by screws.

[0021] Preferably, it also includes:

[0022] a positioning bead, the positioning bead being fixed at the center of the first cover;

[0023] The positioning circular hole is opened at the center of the second cover body, and the positioning protrusion and the positioning circular hole cooperate with each other.

[0024] Preferably, it also includes:

[0025] A tensioning clamp is provided on one end of the three draw cords below the draw cord hole.

[0026] Preferably, it also includes:

[0027] a positioning laser emitter, wherein the positioning laser emitter is slidably disposed on a side wall of the second cover;

[0028] Three auxiliary positioning plates, each of which is fixed on the side wall of the second cover, and each of which corresponds to the three bull noses;

[0029] An auxiliary positioning hole is provided on the auxiliary positioning plate, and the laser line emitted by the positioning laser emitter passes through the auxiliary positioning hole.

[0030] Preferably, it also includes:

[0031] an annular slide rail, the annular slide rail being fixed to the side wall of the second cover body, the center of the annular slide rail and the center of the positioning circular hole coinciding with each other;

[0032] The slider is slidably arranged on the annular slide rail, and the positioning laser transmitter is installed on the slider.

[0033] In addition, the present invention also discloses a method for quickly measuring the axis of a cylinder, comprising the following steps:

[0034] S1: Pull the three pull ropes downward from the pull rope hole to the limit position, then pull the three pull ropes out to a certain equal length position and assemble them, and make the length from the assembly position to the main body greater than the inner diameter of the cylinder and less than 1.5 times the inner diameter of the cylinder, and clamp the three pull ropes with a tightening clamp at the assembly position;

[0035] S2: Use three suction heads to pull back the three pull ropes respectively, and evenly adsorb the three suction heads on a certain section of the inner wall of the cylinder. Then use the tensioning clamp to tighten the three pull ropes synchronously. At this time, the center of the laser through-hole is the axis position of the cylinder at this section.

[0036] Preferably, the method further comprises the following steps:

[0037] S3: Use another of the above-mentioned cylinder axis rapid measurement tools to measure the other axis of the cylinder on another cross-section of the cylinder using the same method, adjust the laser emitter so that its laser line passes through the two laser through-holes of the two measurement tools, that is, forming the axis of the cylinder, and finally measure the distance difference between the inner walls of the two ends of the flange and the above-mentioned laser line to measure the coaxiality of the flange and the cylinder.

[0038] Compared with the existing technology, the cylinder axis rapid determination tool and method using the above technical solution has the following beneficial effects:

[0039] 1. During use, first, the staff adjusts the position of the three adsorption heads so that the distance from the three adsorption heads to the edge of the main body is equal, so as to ensure that the main body is located at the center of the circle where the three adsorption heads are located. Secondly, the three adsorption heads are simultaneously adsorbed on a certain cross-sectional circle of the inner wall of the cylinder, and the three adsorption heads are evenly distributed along the circumferential direction; thirdly, another measuring tool is used in the same way at another cross-section of the inner wall of the cylinder; finally, a laser emitter is used to emit a laser line, and the laser line is passed through the two laser through-holes of the two measuring tools. At this time, the laser line is the position of the axis of the cylinder. This measuring tool has a simple structure, low production cost, and is easy to operate;

[0040] Second, the staff member grasps the bottom ends of the three pull ropes and pulls them simultaneously. At this time, the bottom ends of the three pull ropes move downward in the pull rope holes. The three pull ropes move in the three first through holes relative to the three adsorption heads, respectively. The distance between the three adsorption heads and the main body can be adjusted simultaneously, thereby adapting to the axis center measurement operation of cylinders with different inner diameters, improving the adaptability of the tool and reducing the cost of the measurement operation.

[0041] 3. In this device, the top ends of the three pull ropes are fixed in the three nostrils of the cow respectively. The pull ropes are led out from the nostrils and pass through the first through hole before being introduced into the nostrils of the cow. Then, the bottom ends of the pull ropes pass through the rope hole, the arc-shaped through slot, and the rope hole in sequence. Finally, the bottom ends of the pull ropes extend downward from the rope hole to the bottom of the first cover. When the staff pulls the bottom ends of the pull ropes, the middle sections of the pull ropes move in the rope hole, the arc-shaped through slot, and the rope hole to meet the needs of adjusting the position of the suction head.

[0042] 4. During use, the sliding positioning laser emitter can change the position of the positioning laser emitter relative to the second cover body, thereby changing the irradiation position of the laser line emitted by the positioning laser emitter. When the laser line passes through the auxiliary positioning hole, due to the corresponding distribution of the auxiliary positioning plate and the bull nose hole, the position where the laser line is irradiated on the inner wall of the cylinder can indicate the position where the adsorption head needs to be adsorbed, so that the staff can smoothly find the position where the adsorption head needs to be adsorbed. Since the positioning laser emitter always moves on the side wall of the second cover body, the laser line emitted by the positioning laser emitter can be kept on the same cross-section, thereby ensuring that the position where the laser line is irradiated on the inner wall of the cylinder is located in the same cross-section, so that the adsorption positions of the three adsorption heads can be located in the same cross-section, thereby improving the accuracy of the axis measurement operation.

[0043] 5. During use, the staff can push the slider and move it along the annular slide rail to change the position of the positioning laser emitter. The same positioning laser emitter can be used to locate the adsorption positions of the three adsorption heads in sequence, which can reduce the number of positioning laser emitters and thus reduce the production cost of this tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a three-dimensional schematic diagram of embodiment 1.

[0045] Figure 2 This is a front view of the first cover in the first embodiment.

[0046] Figure 3 Schematic cross-sectional view of the first cover body in Example 1.

[0047] Figure 4 This is a front view of the second cover in the first embodiment.

[0048] Figure 5 Schematic cross-sectional view of the second cover body in Example 1.

[0049] Figure 6 It is a cross-sectional schematic diagram of the second cover body in the second embodiment.

[0050] Figure 7 For Example 2 Figure 6 Enlarged schematic diagram of point A in the middle.

[0051] Figure 8 This is a schematic diagram of the usage status in Example 1. DETAILED DESCRIPTION

[0052] The present invention will be further described below with reference to the accompanying drawings.

[0053] Example 1:

[0054] like Figure 1-Figure 3 As shown, a tool for quickly determining the axis of a cylinder comprises:

[0055] The main body 1 has three bull nose holes 111 evenly arranged along the circumferential direction on the edge of the main body 1;

[0056] A laser through hole 117 is provided at the center of the main body 1;

[0057] A laser emitter 7, wherein the laser line emitted by the laser emitter 7 passes through the laser through hole 117;

[0058] Three pull ropes 3, one end of each of the three pull ropes 3 being fixed in the three bull nose holes 111, and each of the three pull ropes 3 passing through the interior of the main body 1 and extending downward to the bottom of the main body 1;

[0059] Three adsorption heads 2, each of which is used to be adsorbed on the inner wall of the cylinder 5;

[0060] The first through hole 21 is provided on the adsorption head 2 . The pull rope 3 is led out from the cow's nostril 111 and passes through the first through hole 21 before being introduced into the cow's nostril 111 .

[0061] During use, the operator first adjusts the positions of the three adsorption heads 2 so that the distances from the three adsorption heads 2 to the edge of the main body 1 are equal, thus ensuring that the main body 1 is located at the center of the circle containing the three adsorption heads 2. Secondly, the three adsorption heads 2 are simultaneously adsorbed on a certain cross-sectional circle on the inner wall of the cylinder 5, with the three adsorption heads 2 evenly distributed along the circumference. Thirdly, another measuring tool is used in the same manner at another cross-sectional area on the inner wall of the cylinder 5. Finally, a laser beam is emitted from the laser emitter 7, and is passed through the two laser through-holes 117 of the two measuring tools. At this point, the laser beam is the axis of the cylinder 5. This measuring tool has a simple structure, low manufacturing cost, and is easy to operate.

[0062] Specifically, the process of adjusting the position of the adsorption head 2 is as follows: the staff grabs the bottom ends of the three pull ropes 3 with their hands and pulls the three pull ropes 3 at the same time. At this time, the bottom ends of the three pull ropes 3 move downward at the same time, wherein the three pull ropes 3 move relative to the three adsorption heads 2 in the three first through holes 21 respectively, and the distance between the three adsorption heads 2 and the main body 1 can be adjusted at the same time, so as to adapt to the axial center measurement operation of cylinders 5 with different inner diameters, improve the adaptability of the tool, and reduce the cost of the measurement operation.

[0063] like Figure 2-Figure 5 As shown, the main body 1 includes:

[0064] The first cover body 11, the three bull nose holes 111 are provided on the edge of the first cover body 11;

[0065] Three rope threading holes 113 , each of which is provided on the first cover 11 and is connected to the three nose holes 111 , respectively;

[0066] An arcuate through slot 114 , the arcuate through slot 114 being provided on the first cover 11 ;

[0067] A drawstring hole 115 is provided at the bottom end of the first cover 11. The drawstring 3 passes through the drawstring hole 113, the arcuate groove 114, and the drawstring hole 115 in sequence and extends downward to the bottom of the first cover 11. The drawstring hole 115 and the arcuate groove 114 are interconnected.

[0068] The second cover body 12 is mounted on the first cover body 11 , and the rope threading hole 113 , the arc-shaped through groove 114 , and the rope pulling hole 115 are all located between the first cover body 11 and the second cover body 12 .

[0069] In this device, the top ends of the three pull ropes 3 are respectively fixed in the three bull nostrils 111. The pull ropes 3 are led out from the bull nostrils 111 and pass through the first through hole 21 and then introduced into the bull nostril 111. Then the bottom ends of the pull ropes 3 pass through the rope hole 113, the arc-shaped through groove 114, and the rope hole 115 in sequence. Finally, the bottom ends of the pull ropes 3 extend downward from the rope hole 115 to the bottom of the first cover body 11. When the staff pulls the bottom end of the pull rope 3, the middle section of the pull rope 3 moves in the rope hole 113, the arc-shaped through groove 114, and the rope hole 115 to meet the needs of position adjustment of the adsorption head 2.

[0070] In addition, the first cover body 11 and the second cover body 12 are docked together so that the pull rope 3 is located between the first cover body 11 and the second cover body 12, ensuring that the pull rope 3 is always located in the rope hole 113, the arc-shaped through groove 114, and the pull rope hole 115, preventing the pull rope 3 from detaching from the first cover body 11 and the second cover body 12, improving the stability of the pull rope 3 when moving, and thereby stably adjusting the position of the adsorption head 2.

[0071] like Figure 2-Figure 5 As shown, it also includes:

[0072] A first connecting hole 112 , which is provided on the first cover 11 ;

[0073] The second connecting hole 122 is provided on the second cover 12 , and the first connecting hole 112 and the second connecting hole 122 are connected by screws.

[0074] In this tool, there are three first connection holes 112 , which are respectively arranged in the three bull nose holes 111 . There are three second connection holes 122 , which are respectively distributed corresponding to the three first connection holes 112 .

[0075] During use, the first cover 11 and the second cover 12 are first joined together, and then the three first connection holes 112 and the three second connection holes 122 are respectively locked with three screws, thereby removably locking the first cover 11 and the second cover 12. When the screws are removed, the first cover 11 and the second cover 12 can be separated, so that the draw cord 3 can be installed inside the draw cord hole 113, the arcuate groove 114, and the draw cord hole 115. After the three draw cords 3 are installed, the first cover 11 and the second cover 12 are locked together with screws to limit the draw cord 3 and prevent it from falling out of the draw cord hole 113, the arcuate groove 114, and the draw cord hole 115, thereby improving the stability of the operation.

[0076] like Figure 2-Figure 5 As shown, it also includes:

[0077] A positioning bead 116 is fixed at the center of the first cover 11;

[0078] The positioning circular hole 121 is provided at the center of the second cover 12 , and the positioning protrusion 116 and the positioning circular hole 121 cooperate with each other.

[0079] When docking the first cover body 11 and the second cover body 12, by sleeve-fitting the positioning circular hole 121 onto the positioning protrusion 116, radial misalignment between the first cover body 11 and the second cover body 12 can be avoided, which has the effect of pre-positioning; then the second cover body 12 is rotated so that the three first connecting holes 112 and the three second connecting holes 122 correspond to each other, and the screws can be locked, which makes the installation operation relatively simple.

[0080] like Figure 1 、 Figure 8 As shown, it also includes:

[0081] The tensioning clamp 4 is provided on one end of the three draw cords 3 below the draw cord hole 115 .

[0082] In this tool, the tensioning clamp 4 is used to clamp the bottom ends of the three pull ropes 3 at the same time, wherein the weight of the tensioning clamp 4 itself is greater than 10 times the sum of the weights of the main body 1 and the three pull ropes 3, and the gravity of the tensioning clamp 4 is less than the adsorption force of a single adsorption head 2, thereby ensuring that the pull ropes 3 can be tightened and not fall off, thereby improving the stability of the tool when measuring the axis.

[0083] Example 2:

[0084] like Figure 6-Figure 7 As shown, this embodiment also includes the following technical contents relative to embodiment 1:

[0085] A positioning laser emitter 83 slidably disposed on a side wall of the second cover 12 ;

[0086] Three auxiliary positioning plates 84 , each of which is fixed to the side wall of the second cover 12 , and each of which corresponds to the three bull nose holes 111 ;

[0087] The auxiliary positioning hole 85 is formed on the auxiliary positioning plate 84 , and the laser line emitted by the positioning laser emitter 83 passes through the auxiliary positioning hole 85 .

[0088] During use, the sliding positioning laser emitter 83 can change the position of the positioning laser emitter 83 relative to the second cover body 12, thereby changing the irradiation position of the laser line emitted by the positioning laser emitter 83. When the laser line passes through the auxiliary positioning hole 85, due to the corresponding distribution of the auxiliary positioning plate 84 and the bull nose hole 111, the position where the laser line is irradiated on the inner wall of the cylinder 5 can indicate the position where the adsorption head 2 needs to be adsorbed, so that the staff can smoothly find the position where the adsorption head 2 needs to be adsorbed.

[0089] In addition, since the positioning laser emitter 83 always moves on the side wall of the second cover body 12, the laser line emitted by the positioning laser emitter 83 can be maintained on the same cross-section, thereby ensuring that the position where the laser line irradiates the inner wall of the cylinder 5 is located within the same cross-section, so that the adsorption positions of the three adsorption heads 2 can be located within the same cross-section, thereby improving the accuracy of the axis measurement operation.

[0090] like Figure 6-Figure 7 As shown, it also includes:

[0091] An annular slide rail 81, the annular slide rail 81 is fixed to the side wall of the second cover 12, and the center of the annular slide rail 81 and the center of the positioning circular hole 121 coincide with each other;

[0092] The slider 82 is slidably arranged on the annular slide rail 81 , and the positioning laser emitter 83 is installed on the slider 82 .

[0093] During use, the staff can push the slider 82 and move the slider 82 along the annular slide rail 81, thereby changing the position of the positioning laser emitter 83. The same positioning laser emitter 83 can be used to locate the adsorption positions of the three adsorption heads 2 in sequence, which can reduce the number of positioning laser emitters 83 and thus reduce the production cost of the tool.

[0094] In addition, the present invention also discloses a method for quickly measuring the axis of a cylinder, comprising the following steps:

[0095] S1: Pull the three pull ropes 3 downward from the pull rope hole 115 to the limit position, then pull the three pull ropes 3 to a certain equal length position and gather them together, and make the length from the gathering position to the main body 1 greater than the inner diameter of the cylinder 5 and less than 1.5 times the inner diameter of the cylinder 5, and clamp the three pull ropes 3 with a tension clamp 4 at the gathering position;

[0096] S2: Use the three adsorption heads 2 to pull back the three pull ropes 3 respectively, and evenly adsorb the three adsorption heads 2 on a certain section of the inner wall of the cylinder 5, and then use the tensioning clamp 4 to synchronously tighten the three pull ropes 3. At this time, the center of the laser through hole 117 is the axial position of the cylinder 5 at this section.

[0097] Preferably, Figure 8 As shown, the following steps are also included:

[0098] S3: Use another of the above-mentioned cylinder axis rapid measurement tools to measure the other axis of the cylinder 5 on another cross-section of the cylinder 5 using the same method, adjust the laser emitter 7 so that its laser line passes through the two laser through holes 117 of the two measurement tools, that is, forming the axis of the cylinder 5, and finally measure the distance difference between the inner walls of the two ends of the flange 6 and the above-mentioned laser line to measure the coaxiality of the flange 6 and the cylinder 5.

[0099] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A tool for quickly measuring the axis of a cylinder, characterized in that: include: A main body (1), wherein three bull nose holes (111) are evenly arranged along the circumferential direction at the edge of the main body (1); A laser through hole (117), wherein the laser through hole (117) is opened at the center of the main body mechanism (1); A laser emitter (7), wherein a laser line emitted by the laser emitter (7) passes through the laser through-hole (117); Three pull ropes (3), one end of each of the three pull ropes (3) is fixed in three bull nose holes (111), and each of the three pull ropes (3) passes through the interior of the main body (1) and extends downward to the bottom of the main body (1); Three adsorption heads (2), the adsorption heads (2) being used to be adsorbed on the inner wall of the cylinder (5); A first through hole (21), wherein the first through hole (21) is provided on the adsorption head (2), and the pull rope (3) is led out from the cow's nostril (111), passes through the first through hole (21), and then is introduced into the cow's nostril (111); The main body (1) comprises: A first cover body (11), wherein the three bull nose holes (111) are provided at the edge of the first cover body (11); Three rope threading holes (113), the three rope threading holes (113) are all opened on the first cover body (11), and the three rope threading holes (113) are respectively connected to the three bull nose holes (111); an arc-shaped through groove (114), wherein the arc-shaped through groove (114) is provided on the first cover body (11); A drawstring hole (115), wherein the drawstring hole (115) is provided on the bottom end of the first cover body (11), and the drawstring (3) passes through the drawstring hole (113), the arc-shaped through groove (114), and the inside of the drawstring hole (115) in sequence and extends downward to the bottom of the first cover body (11), and the drawstring hole (115) and the arc-shaped through groove (114) are interconnected; A second cover body (12), wherein the second cover body (12) is mounted on the first cover body (11), and the rope threading hole (113), the arc-shaped through groove (114), and the rope pulling hole (115) are all located between the first cover body (11) and the second cover body (12).

2. The cylinder axis rapid measurement tool according to claim 1, characterized in that: Also includes: A first connecting hole (112), the first connecting hole (112) being provided on the first cover body (11); A second connecting hole (122), wherein the second connecting hole (122) is provided on the second cover body (12), and the first connecting hole (112) and the second connecting hole (122) are connected via screws.

3. The tool for rapid determination of the axis of a cylinder according to claim 2, characterized in that: Also includes: a positioning convex ring (116), wherein the positioning convex ring (116) is fixed at the center of the first cover body (11); A positioning circular hole (121) is provided at the center of the second cover body (12), and the positioning convex ring (116) and the positioning circular hole (121) cooperate with each other.

4. The tool for rapid determination of the axis of a cylinder according to claim 1, characterized in that: Also includes: A tensioning clamp (4) is provided on one end of the three draw cords (3) located below the draw cord hole (115).

5. The tool for rapid determination of the axis of a cylinder according to claim 1, characterized in that: Also includes: a positioning laser emitter (83), wherein the positioning laser emitter (83) is slidably disposed on a side wall of the second cover (12); Three auxiliary positioning plates (84), the three auxiliary positioning plates (84) are all fixed on the side wall of the second cover (12), and the three auxiliary positioning plates (84) are respectively distributed corresponding to the three bull nose holes (111); An auxiliary positioning hole (85) is provided on the auxiliary positioning plate (84), and the laser line emitted by the positioning laser emitter (83) passes through the auxiliary positioning hole (85).

6. The tool for quickly measuring the axis of a cylinder according to claim 5, characterized in that: Also includes: An annular slide rail (81), the annular slide rail (81) being fixed on the side wall of the second cover body (12), the center of the annular slide rail (81) and the center of the positioning circular hole (121) being coincident with each other; A slider (82) is slidably arranged on the annular slide rail (81), and the positioning laser emitter (83) is mounted on the slider (82).

7. A method for measuring the cylinder axis rapid measurement tool according to claim 4, characterized in that: The steps include: S1: Pull the three pull ropes (3) downward from the pull rope hole (115) to the extreme position, then pull the three pull ropes (3) out to a certain equal length position and gather them together, and make the length from the gathering position to the main body (1) greater than the inner diameter of the cylinder (5) and less than 1.5 times the inner diameter of the cylinder (5), and clamp the three pull ropes (3) with a tension clamp (4) at the gathering position; S2: The three pull ropes (3) are pulled back respectively by the three adsorption heads (2), and the three adsorption heads (2) are evenly adsorbed on a certain section of the inner wall of the cylinder (5), and then the three pull ropes (3) are tightened synchronously by the tensioning clamp (4). At this time, the center of the laser through hole (117) is the axis position of the cylinder (5) at the section.

8. The method for measuring the cylinder axis rapid measurement tool according to claim 7, characterized in that: The following steps are also included: S3: Use another of the aforementioned cylinder axis rapid measurement tools to measure another axis of the cylinder (5) on another cross section of the cylinder (5) in the same manner, adjust the laser emitter (7) so that its laser line passes through the two laser through holes (117) of the two measurement tools, thus forming the axis of the cylinder (5), and finally measure the distance difference between the inner walls of the two ends of the flange (6) and the aforementioned laser line, thereby measuring the coaxiality of the flange (6) and the cylinder (5).

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