Intelligent stern tube concentricity measuring tool

Abstract

An intelligent stern tube concentricity measuring tool disclosed by the present invention comprises a fixed ring, a central base and a flange tool, the fixed ring is fixedly provided with three groups of inner supporting arms and three groups of electric cylinders, the three groups of inner supporting arms are uniformly distributed at intervals along the circumferential direction of the fixed ring, and the central base is fixedly provided with a flange. The three sets of electric cylinders are evenly distributed in the circumferential direction of the fixing ring at intervals, a rotating motor is installed on the center base, an output shaft of the rotating motor is fixedly connected with a fixing platform, and a concentricity measuring instrument is placed on the fixing platform. According to the technical scheme, the tool is simple in center positioning mode and suitable for stern tubes with different inner diameters, the concentricity measuring instrument is fixed through a fixing platform in a negative pressure adsorption mode and is convenient to mount and dismount, a laser transmitter and a laser receiver jointly form a stern tube slope measuring mechanism, external force is applied to the tool, and the concentricity measuring instrument can be conveniently mounted and dismounted. The tool can be driven to move back and forth.

Description

Technical Field

[0001] The present invention relates to the technical field of stern tube concentricity measurement, and in particular to an intelligent ship stern tube concentricity measurement tool. Background Art

[0002] The stern tube is a crucial piece of equipment purchased during shipbuilding, with every ship having one or two. Smart ship stern tubes are advanced systems that integrate sensors, data acquisition systems, and intelligent algorithms to monitor the operating status of the stern tube and propeller shaft in real time (e.g., vibration, temperature, pressure, and alignment accuracy), enabling predictive maintenance and automated optimization. Their core goal is to reduce mechanical failures, extend service life, and lower operational costs. Currently under construction, smart ships have two sets of stern tubes: an integral bow stern tube and a separate stern tube. Concentricity measurements are performed during stern tube in-warehouse inspection and before and after epoxy coating during installation on the slipway. Concentricity measurements are also required to verify that the stern tube slope meets the drawing requirements. Excessively large or small stern tube slopes can cause overheating in the stern tube, which can lead to damage in severe cases. It can even cause the stern shaft to break, resulting in a loss of propulsion and immobilization, potentially causing a major safety incident or significant economic loss.

[0003] When measuring stern tube concentricity, the shapes and sizes of stern tubes vary across different ship types, and the existing concentricity measuring instrument's base cannot measure the concentricity of all stern tubes. The inside diameter of a smart stern tube is significantly smaller than that of a conventional stern tube. The existing rectangular flatbed concentricity measurement fixture is too long, and the receiver cannot fit on the fixture. The locking bolts are too large, leaving little room for tightening them, making it difficult to tighten them by hand. The inner bore of the stern tube has a slope, but without a measuring reference at either end, the slope cannot be measured.

[0004] Therefore, we proposed an intelligent stern tube concentricity measurement tool to solve the above problems. Summary of the Invention

[0005] Technical issues solved: In response to the shortcomings of the existing technology, the present invention provides an intelligent stern tube concentricity measurement tool. The center positioning method of the tool is simple and it is applicable to stern tubes with different inner diameters. The fixing platform fixes the concentricity measuring instrument by negative pressure adsorption, which facilitates the installation and disassembly of the concentricity measuring instrument. The laser transmitter and the laser receiver together constitute the stern tube slope measurement mechanism. Applying external force to the tool can drive the tool to move forward and backward, solving the technical problems mentioned in the background technology.

[0006] Technical solution: To achieve the above object, the present invention is implemented through the following technical solutions: An intelligent stern tube concentricity measuring tool, comprising a fixing ring, a center base and a flange tool, wherein an inner support arm and an electric cylinder are fixedly arranged on the fixing ring, the inner support arm is provided with three groups, the electric cylinder is provided with three groups, the three groups of inner support arms are evenly spaced along the circumferential direction of the fixing ring, and the three groups of electric cylinders are evenly spaced along the circumferential direction of the fixing ring, the inner support arm comprises a fixing cylinder, the fixing cylinder is equipped with a spring, one end of the spring is fixedly connected to a sliding rod, and the sliding rod is slidably connected to the fixing cylinder, one end of the sliding rod is provided with a first inner support head, and one end of the electric cylinder push rod is fixedly connected to a second inner support head, the fixation and pre-positioning of the tooling are achieved by the three groups of inner support arms, and then the second inner support head is driven by the three groups of electric cylinders. The inner support head performs automatic calibration and positioning. A rotating motor is installed on the center base. The output shaft of the rotating motor is fixedly connected to a fixed platform. A concentricity measuring instrument is placed on the fixed platform. The rotating motor drives the measuring probe to perform circular motion with the center of the center base as the base point, and applies a certain external force to the tooling, which can drive the tooling to move back and forth to achieve the measurement of the concentricity of different positions of the stern tube. A mounting frame is fixedly provided on the center base, and a laser transmitter is installed on the mounting frame. The flange tooling is installed on the stern tube copper sleeve, and a laser receiver is installed on the flange tooling. The laser transmitter and the laser receiver together constitute a stern tube slope measurement mechanism. The laser transmitter emits a horizontal laser beam as a reference, and the laser receiver receives the laser spot.

[0007] In one possible implementation, the concentricity measuring instrument includes a measuring probe, one end of which is in contact with the inner wall of the stern tube. The contact between the measuring probe of the concentricity measuring instrument and the inner wall of the stern tube is adjusted to perform contact concentricity measurement, and the probe contacts the measured surface and moves synchronously with the displacement of the tooling.

[0008] In one possible implementation, the fixed platform includes an adsorption platform, a negative pressure pump assembly is installed on the lower end surface of the adsorption platform, and a plurality of groups of negative pressure adsorption holes are provided on the upper end surface of the adsorption platform. The concentricity measuring instrument is stabilized by relying on the negative pressure adsorption force generated by the plurality of groups of negative pressure adsorption holes, without the need to use fasteners such as screws, thereby avoiding the phenomenon that the bolts cannot be tightened manually because the locking bolts are too large and the space for tightening the bolts is relatively small.

[0009] In one possible implementation, a connecting shaft is welded and fixed on the adsorption platform, and the output shaft of the rotating motor is fixedly connected to the connecting shaft of the adsorption platform via a coupling. The rotating motor drives the measuring probe to perform circular motion with the center of the center base as the base point, and the measuring probe measures the concentricity of the stern tube during the circular motion.

[0010] In one possible implementation, a center positioning frame is fixedly provided on the flange tooling, the laser receiver is mounted on the center positioning frame, the laser transmitter emits a horizontal laser beam as a reference, the laser receiver receives the laser spot, and calculates the offset through the change in the spot position to achieve slope measurement.

[0011] In one possible implementation, the flange tooling includes a mounting lug with a mounting hole formed thereon. The flange tooling is fixedly connected to the stern tube by bolts. The flange tooling is processed based on the outer diameter of the copper sleeves of the left and right stern tubes of the smart ship stern. The center line of the inner hole of the flange tooling is the same as the center line of the stern tube.

[0012] In a possible implementation, one end of the spring is fixedly connected to the inner wall of the fixed cylinder, the other end of the spring is fixedly connected to the sliding rod, and one end of the sliding rod is slidably embedded in the interior of the fixed cylinder.

[0013] In a possible implementation, the central base includes a control panel, a first inner support head at one end of the inner support arm contacts the inner wall of the stern tube, and a second inner support head at one end of the electric cylinder contacts the inner wall of the stern tube.

[0014] In one possible implementation, the first inner support head includes a first limit card seat and a first ball, the first ball is rollingly connected to the first limit card seat, and the first ball can roll relative to the first limit card seat. When the first inner support head contacts the inner wall of the stern tube, a certain external force is applied to the tooling, which can drive the tooling to move along the center line of the stern tube.

[0015] In one possible implementation, the second inner support head includes a second limit card seat and a second ball, and the second ball is rollingly connected to the second limit card seat. The second ball can roll relative to the second limit card seat. When the second inner support head contacts the inner wall of the stern tube, a certain external force is applied to the tooling, which can drive the tooling to move along the center line of the stern tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes the fixation and pre-positioning of the tooling through three groups of inner support arms, and then drives the second inner support head through three groups of electric cylinders to perform automatic calibration and positioning. Then, the concentricity measuring instrument for measurement is placed on a fixed platform, and the contact between the measuring probe of the concentricity measuring instrument and the inner wall of the stern tube is adjusted to perform contact concentricity measurement. The rotating motor drives the measuring probe to perform circular motion with the center of the center base as the base point. The measuring probe measures the concentricity of the stern tube during the circular motion. The center positioning method of the tooling is simple and is applicable to stern tubes with different inner diameters.

[0017] The fixing platform of the present invention fixes the concentricity measuring instrument by negative pressure adsorption, relying on the negative pressure adsorption force generated by multiple groups of negative pressure adsorption holes to achieve the stability of the concentricity measuring instrument. When installing and fixing the concentricity measuring instrument, there is no need to use fasteners such as screws, which makes the installation and disassembly of the concentricity measuring instrument convenient, and avoids the occurrence of the phenomenon that the bolt cannot be tightened manually because the locking bolt is too large and the space for tightening the bolt is relatively small.

[0018] The laser transmitter and laser receiver of the present invention together constitute a stern tube slope measurement mechanism. The laser transmitter emits a horizontal laser beam as a reference, and the laser receiver receives the laser spot. The offset is calculated based on the change in the spot position. The laser transmitter and laser receiver can achieve slope measurement from micrometer to arc second levels through non-contact, high-sensitivity spot offset detection.

[0019] The present invention applies a certain external force to the tooling to drive the tooling to move forward and backward, thereby realizing the measurement of the concentricity of different positions of the stern tube, thereby improving the measurement efficiency and the flexibility of the tooling during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.

[0021] Figure 1 It is a side view structural schematic diagram of the present invention; Figure 2 is another side view structural schematic diagram of the present invention; Figure 3 is a side view of the present invention; Figure 4 Schematic diagram of the structure of the inner support arm of the present invention; Figure 5 It is a schematic diagram of the installation of the present invention; Figure 6 Schematic diagram of the installation of the concentricity measuring instrument of the present invention; Figure 7 It is a structural schematic diagram of the fixed platform of the present invention; Figure 8 This is a schematic diagram of the side view structure of the flange tooling of the present invention; Figure 9 This is another side view of the flange fixture of the present invention; Figure 10 for Figure 1 A partial enlarged view of area A in the middle.

[0022] In the figure: 1. Fixed ring; 2. Center base; 3. Inner support arm; 4. Electric cylinder; 5. Fixed platform; 6. Rotating motor; 7. Laser transmitter; 8. Flange tooling; 9. Laser receiver; 10. Concentricity measuring instrument; 101. Measuring probe; 21. Mounting frame; 22. Control panel; 31. First inner support head; 32. Fixed cylinder; 33. Sliding rod; 34. Spring; 311. First limit holder; 312. First ball; 41. Second inner support head; 411. Second limit holder; 412. Second ball; 51. Adsorption platform; 52. Negative pressure pump assembly; 53. Negative pressure adsorption hole; 54. Connecting shaft; 81. Center positioning frame; 82. Mounting lug. DETAILED DESCRIPTION

[0023] The embodiment of the present application provides an intelligent stern tube concentricity measurement tool. The center positioning method of the tool is simple and suitable for stern tubes with different inner diameters. The fixing platform fixes the concentricity measuring instrument by negative pressure adsorption, which facilitates the installation and disassembly of the concentricity measuring instrument. The laser transmitter and the laser receiver together constitute the stern tube slope measurement mechanism. Applying external force to the tool can drive the tool to move forward and backward, thereby solving the technical problems mentioned in the background technology.

[0024] The technical solution in the embodiments of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows: Example 1: See also Figure 1-10 The present invention provides a technical solution: an intelligent stern tube concentricity measurement tool, comprising a fixing ring 1, a center base 2 and a flange tool 8, wherein an inner support arm 3 and an electric cylinder 4 are fixedly arranged on the fixing ring 1, the inner support arm 3 is provided in three groups, the electric cylinder 4 is provided in three groups, the three groups of inner support arms 3 are evenly spaced along the circumferential direction of the fixing ring 1, the three groups of electric cylinders 4 are evenly spaced along the circumferential direction of the fixing ring 1, the inner support arm 3 includes a fixing cylinder 32, the fixing cylinder 32 has a spring 34 built in, one end of the spring 34 is fixedly connected to the sliding Rod 33, and the sliding rod 33 is slidably connected to the fixed cylinder 32, one end of the sliding rod 33 is provided with a first inner support head 31, one end of the push rod of the electric cylinder 4 is fixedly connected to the second inner support head 41, a rotating motor 6 is installed on the central base 2, the output shaft of the rotating motor 6 is fixedly connected to the fixed platform 5, a concentricity measuring instrument 10 is placed on the fixed platform 5, a mounting frame 21 is fixedly provided on the central base 2, a laser transmitter 7 is installed on the mounting frame 21, a flange tooling 8 is installed on the stern tube copper sleeve, and a laser receiver 9 is installed on the flange tooling 8.

[0025] Three groups of evenly spaced inner support arms 3 constitute a pre-fixing mechanism. When the tooling is placed in the inner diameter of the stern tube, the first inner support heads 31 of the three groups of inner support arms 3 are in contact with the inner wall of the stern tube. The first inner support heads 31 are subjected to external force, which is synchronously applied to the spring 34 through the slide rod 33. The spring 34 is compressed, and part of the slide rod 33 is correspondingly embedded in the fixing tube 32. It is adaptively adjusted according to the inner diameter of the stern tube, and the fixation and pre-positioning of the tooling are achieved through the three groups of inner support arms 3.

[0026] Three groups of evenly spaced electric cylinders 4 and second inner support heads 41 constitute a calibration mechanism. When the electric cylinder 4 is working, it drives the second inner support head 41 at one end thereof to move. The three groups of electric cylinders 4 work synchronously, driving the three groups of second inner support heads 41 to move synchronously, so that the three groups of second inner support heads 41 are in contact with the inner wall of the stern tube. Three-point internal support is achieved through the three groups of second inner support heads 41, and automatic calibration is achieved. After calibration, the center base 2 is located at the center position of the inner diameter of the stern tube and coincides with the center line of the stern tube.

[0027] In some examples, the concentricity measuring instrument 10 includes a measuring probe 101 , one end of which is in contact with the inner wall of the stern tube.

[0028] After being pre-positioned by three sets of inner support arms 3, the three sets of electric cylinders 4 are used for automatic calibration and positioning. Then, the concentricity measuring instrument 10 for measurement is placed on the fixed platform 5. The contact between the measuring probe 101 of the concentricity measuring instrument 10 and the inner wall of the stern tube is adjusted to perform contact concentricity measurement. The probe 101 contacts the surface to be measured and moves synchronously with the displacement of the tooling.

[0029] In some examples, the fixed platform 5 includes an adsorption platform 51 , a negative pressure pump assembly 52 is installed on the lower end surface of the adsorption platform 51 , and a plurality of negative pressure adsorption holes 53 are provided on the upper end surface of the adsorption platform 51 .

[0030] The fixing method of the fixed platform 5 for the concentricity measuring instrument 10 is negative pressure adsorption type fixing. When the negative pressure pump assembly 52 is working, the multiple groups of negative pressure adsorption holes 53 on the upper end surface of the fixed platform 5 generate negative pressure adsorption force. When the concentricity measuring instrument 10 is placed on the fixed platform 5, the bottom of the concentricity measuring instrument 10 is tightly attached to the upper end surface of the adsorption platform 51. Relying on the negative pressure adsorption force generated by the multiple groups of negative pressure adsorption holes 53, the concentricity measuring instrument 10 is stabilized. When installing and fixing the concentricity measuring instrument 10, there is no need to use fasteners such as screws, which makes it easy to install and disassemble the concentricity measuring instrument 10 and avoids the occurrence of the phenomenon that the locking bolt is too large and the space for tightening the bolt is relatively small, making it impossible to tighten the bolt manually.

[0031] In some examples, a connecting shaft 54 is welded and fixed on the adsorption platform 51 , and the output shaft of the rotary motor 6 is fixedly connected to the connecting shaft 54 of the adsorption platform 51 via a coupling. When the rotary motor 6 is working, it drives the connecting shaft 54 to rotate.

[0032] When the rotating motor 6 is working, it can drive the fixed platform 5 to rotate relative to the center base 2. When the concentricity measuring instrument 10 is placed on the fixed platform 5, the concentricity measuring instrument 10 follows the fixed platform 5 and rotates relative to the center base 2 synchronously. That is, the measuring probe 101 is driven by the rotating motor 6 to rotate relative to the center base 2. The position of the measuring probe 101 is controlled by the rotation direction and number of rotations of the output shaft of the rotating motor 6. The rotating motor 6 drives the measuring probe 101 to perform circular motion with the center of the center base 2 as the base point. During the circular motion, the measuring probe 101 senses the displacement change of the measured surface and calculates its offset from the reference axis, thereby evaluating the concentricity error. Through displacement perception and signal conversion, the geometric deviation is converted into quantifiable data.

[0033] In some examples, a center positioning frame 81 is fixedly provided on the flange tooling 8 , and the laser receiver 9 is mounted on the center positioning frame 81 .

[0034] The laser receiver 9 is mounted and fixed at the center position of the center positioning frame 81. The flange tooling 8 is mounted and fixed on the stern tube copper sleeve. The flange tooling 8 is machined based on the outer diameter of the copper sleeves of the left and right stern tubes of the intelligent ship. The centerline of the inner hole of the flange tooling 8 is consistent with the centerline of the stern tube. The slope of the intelligent ship's stern tube can be measured using the inner hole of the flange tooling 8 as a reference. The laser transmitter 7 is mounted and fixed on the mounting frame 21, which is fixed on the central base 2. The central base 2 is the center of the tooling. That is, the laser transmitter 7 is mounted at the center position of the tooling, consistent with the centerline of the stern tube. The laser transmitter 7 and laser receiver 9 together constitute the stern tube slope measurement mechanism. The laser transmitter 7 emits a horizontal laser beam as a reference, and the laser receiver 9 receives the laser spot and calculates the offset based on the change in the spot position. The laser transmitter 7 and laser receiver 9 can achieve slope measurement from micrometers to arc seconds through non-contact, high-sensitivity spot offset detection.

[0035] In some examples, the flange tooling 8 includes a mounting lug 82, which has a mounting hole. The flange tooling 8 is fixed to the stern tube by bolts. The flange tooling 8 is processed based on the outer diameter of the copper sleeves of the left and right stern tubes of the smart ship stern. The flange tooling 8 is adapted to the stern tube, which facilitates the installation and disassembly of the flange tooling 8.

[0036] In some examples, one end of the spring 34 is fixedly connected to the inner wall of the fixed tube 32, and the other end of the spring 34 is fixedly connected to the slide rod 33, and one end of the slide rod 33 is slidably embedded in the interior of the fixed tube 32. The spring 34 will be compressed when subjected to external force. When the spring 34 is compressed, one end of the slide rod 33 slides accordingly along the fixed tube 32, and the extended length of the slide rod 33 relative to the fixed tube 32 is adjusted accordingly. The overall tooling is suitable for stern tubes with different inner diameters, has high versatility, and can realize the measurement of the concentricity of different stern tubes.

[0037] In some examples, the central base 2 includes a control panel 22, a first inner support head 31 at one end of the inner support arm 3 is in contact with the inner wall of the stern tube, and a second inner support head 41 at one end of the electric cylinder 4 is in contact with the inner wall of the stern tube. The start and stop of the electric cylinder 4 and the rotating motor 6 are controlled by the control panel 22. The central base 2 has a built-in power module to provide stable power support for the tooling, and the tooling can be connected to an external power supply.

[0038] By adopting the above technical solutions: The tooling is fixed and pre-positioned by three groups of inner support arms 3, and then the second inner support head 41 is driven by three groups of electric cylinders 4 for automatic calibration and positioning. Then, the concentricity measuring instrument 10 for measurement is placed on the fixed platform 5, and the contact between the measuring probe 101 of the concentricity measuring instrument 10 and the inner wall of the stern tube is adjusted to perform contact concentricity measurement. The rotary motor 6 drives the measuring probe 101 to perform circular motion with the center of the center base 2 as the base point. The measuring probe 101 measures the concentricity of the stern tube during the circular motion. The center positioning method of the tooling is simple and applicable to stern tubes with different inner diameters.

[0039] The fixing method of the fixing platform 5 for the concentricity measuring instrument 10 is negative pressure adsorption type fixing, relying on the negative pressure adsorption force generated by multiple groups of negative pressure adsorption holes 53 to achieve the stability of the concentricity measuring instrument 10. When installing and fixing the concentricity measuring instrument 10, there is no need to use fasteners such as screws, which facilitates the installation and disassembly of the concentricity measuring instrument 10 and avoids the occurrence of the phenomenon that the locking bolt is too large and the space for tightening the bolt is relatively small, making it impossible to tighten the bolt manually.

[0040] The laser emitter 7 and the laser receiver 9 together constitute the stern tube slope measurement mechanism. The laser emitter 7 emits a horizontal laser beam as a reference, and the laser receiver 9 receives the laser spot and calculates the offset through the change in the spot position. The laser emitter 7 and the laser receiver 9 can achieve slope measurement from micron level to arc second level through non-contact, high-sensitivity spot offset detection.

[0041] Example 2: Based on Example 1, this example introduces the specific structure of the first inner support head 31 and the second inner support head 41 in an intelligent stern tube concentricity measurement tool. The first inner support head 31 includes a first limit seat 311 and a first ball 312. The first ball 312 is rollingly connected to the first limit seat 311.

[0042] In some examples, the second inner support head 41 includes a second position-limiting seat 411 and a second rolling ball 412 , and the second rolling ball 412 is in rolling connection with the second position-limiting seat 411 .

[0043] The first ball 312 can roll relative to the first limit holder 311. When the first inner support head 31 contacts the inner wall of the stern tube, a certain external force is applied to the tooling, which can drive the tooling to move along the center line of the stern tube. The second ball 412 can roll relative to the second limit holder 411. When the second inner support head 41 contacts the inner wall of the stern tube, a certain external force is applied to the tooling, which can drive the tooling to move along the center line of the stern tube.

[0044] By adopting the above technical solutions: Applying a certain external force to the tooling can drive the tooling to move forward and backward, realizing the measurement of the concentricity of different positions of the stern tube, thereby improving the measurement efficiency and the flexibility of the tooling during use.

[0045] Finally, it should be noted that the above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all embodiments. However, obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An intelligent stern tube concentricity measurement tool, comprising a fixing ring (1), a center base (2) and a flange tool (8), characterized in that: An inner support arm (3) and an electric cylinder (4) are fixedly provided on the fixed ring (1). The inner support arm (3) is provided in three groups, and the electric cylinder (4) is provided in three groups. The three groups of inner support arms (3) are evenly distributed along the circumferential direction of the fixed ring (1). The three groups of electric cylinders (4) are evenly distributed along the circumferential direction of the fixed ring (1). The inner support arm (3) includes a fixed cylinder (32). The fixed cylinder (32) has a spring (34) built therein. One end of the spring (34) is fixedly connected to a sliding rod (33), and the sliding rod (33) is slidably connected to the fixed cylinder (32). A first inner support head (31) is provided at one end of the rod (33), one end of the push rod of the electric cylinder (4) is fixedly connected to a second inner support head (41), a rotating motor (6) is installed on the central base (2), an output shaft of the rotating motor (6) is fixedly connected to a fixed platform (5), a concentricity measuring instrument (10) is placed on the fixed platform (5), a mounting frame (21) is fixedly provided on the central base (2), a laser transmitter (7) is installed on the mounting frame (21), the flange tooling (8) is installed on the stern tube copper sleeve, and a laser receiver (9) is installed on the flange tooling (8).

2. The intelligent stern tube concentricity measurement tool according to claim 1, characterized in that: The concentricity measuring instrument (10) comprises a measuring probe (101), one end of the measuring probe (101) being in contact with the inner wall of the stern tube.

3. The intelligent stern tube concentricity measurement tool according to claim 1, characterized in that: The fixed platform (5) comprises an adsorption platform (51), a negative pressure pump assembly (52) is installed on the lower end surface of the adsorption platform (51), and a plurality of groups of negative pressure adsorption holes (53) are provided on the upper end surface of the adsorption platform (51).

4. The intelligent stern tube concentricity measurement tool according to claim 3, characterized in that: A connecting shaft (54) is welded and fixed on the adsorption platform (51), and the output shaft of the rotating motor (6) and the connecting shaft (54) of the adsorption platform (51) are fixedly connected via a coupling.

5. The intelligent stern tube concentricity measurement tool according to claim 1, characterized in that: A center positioning frame (81) is fixedly provided on the flange tooling (8), and the laser receiver (9) is mounted on the center positioning frame (81).

6. The intelligent stern tube concentricity measurement tool according to claim 1, characterized in that: The flange fixture (8) comprises a mounting lug (82), a mounting hole is provided on the mounting lug (82), and the flange fixture (8) is fixedly connected to the stern tube via bolts.

7. The intelligent stern tube concentricity measurement tool according to claim 1, characterized in that: One end of the spring (34) is fixedly connected to the inner wall of the fixed cylinder (32), and the other end of the spring (34) is fixedly connected to the slide rod (33), and one end of the slide rod (33) is slidably embedded in the interior of the fixed cylinder (32).

8. The intelligent stern tube concentricity measurement tool according to claim 1, characterized in that: The central base (2) includes a control panel (22), a first inner support head (31) at one end of the inner support arm (3) contacts the inner wall of the stern tube, and a second inner support head (41) at one end of the electric cylinder (4) contacts the inner wall of the stern tube.

9. The intelligent stern tube concentricity measurement tool according to claim 1, characterized in that: The first inner support head (31) comprises a first position-limiting clamping seat (311) and a first rolling ball (312), and the first rolling ball (312) is rollingly connected to the first position-limiting clamping seat (311).

10. The intelligent stern tube concentricity measurement tool according to claim 1, characterized in that: The second inner support head (41) comprises a second position-limiting clamping seat (411) and a second rolling ball (412), and the second rolling ball (412) is rollingly connected to the second position-limiting clamping seat (411).

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