Device for measuring inner diameter of small-size deep hole and synchronously detecting defects of inner wall of small-size deep hole

Abstract

The invention belongs to the field of precision measurement and electromagnetic nondestructive testing, and discloses a small-size deep hole inner diameter measurement and inner wall defect synchronous detection device, which comprises a fixed sleeve, an inner diameter measurement assembly and an inner wall defect detection assembly, and is characterized in that the fixed sleeve is used for fixing the inner diameter measurement assembly and the inner wall defect detection assembly; the inner diameter measuring assembly is driven by the rotation driving mechanism and the first fixing sleeve to move in the axial direction of the to-be-measured hole, and the inner diameter of the to-be-measured hole within the full length is measured in a rotating mode. The inner wall defect detection assembly is used for moving along the axis of the to-be-detected hole under driving of the first fixing sleeve and detecting the inner wall defect of the to-be-detected hole. According to the invention, each element is fixed on the fixed sleeve matched with the inner diameter of the to-be-detected hole, and each element is driven by the fixed sleeve to go deep into the hole during measurement, so that the problems of insufficient adaptability of the size of a traditional probe and the inner diameter of a pipeline, difficulty in going deep into a slender pipeline and jamming of the probe are solved, the detection efficiency is improved, and full-length continuous detection is realized.

Description

Technical Field

[0001] This invention belongs to the field of precision measurement and electromagnetic non-destructive testing technology, specifically relating to a device for simultaneous detection of inner diameter and inner wall defects in small-sized deep holes. Background Technology

[0002] Against the backdrop of global energy structure transformation and low-carbon development, nuclear power, as a clean and efficient energy source, occupies a crucial position in the power supply system. The stable operation of nuclear power reactors is directly related to energy security and public safety, and heat exchanger pipes, as core components of the reactor's thermal cycle system, undertake the important functions of heat exchange and medium transmission. The integrity of their inner walls is a key factor in ensuring the safe operation of the reactor.

[0003] These types of pipes are mostly deep-hole components (small inner diameter: φ8-15mm, hole depth: 200-1000mm), operating under extreme conditions of high temperature, high pressure, strong radiation, and corrosive media for extended periods. They are highly susceptible to internal wall defects (such as cracks, pits, and thinning) due to fatigue wear, corrosion, and stress concentration. If these defects are not detected and allowed to spread in time, they can lead to media leakage, a sharp drop in heat exchange efficiency, and even serious safety accidents. Therefore, regular and accurate inspection of the internal wall defects of heat exchanger tubes is a core requirement for the maintenance and safety management of nuclear power equipment.

[0004] Currently, the detection technology for defects in the inner wall of deep-hole components mainly relies on traditional ultrasonic testing and eddy current testing. However, these testing methods have certain limitations. For example, the probe size is not well adapted to the inner diameter of the pipe, making it difficult to penetrate into the interior of slender pipes, or it is prone to jamming when moving inside the pipe, making it impossible to conduct continuous full-length testing, resulting in low efficiency. Furthermore, the detection accuracy is limited, and the ability to identify micro-cracks (such as defects with a length of less than 0.5 mm) is weak, making it easy to miss detections.

[0005] For measuring the inner diameter of deep-hole components, the most widely used methods currently include industrial endoscopy, eddy current testing, ultrasonic testing, and flexible magnetic particle or penetrant testing. Industrial endoscopes allow direct observation through optical imaging, but the miniature lenses are prone to tremors during long-distance movement, limiting image stability and resolution. Eddy current testing alone suffers from strong interference signals due to minute changes in probe distance within the narrow hole, making the results difficult to interpret. Ultrasonic testing can theoretically detect internal defects; however, traditional ultrasonic testing requires a coupling agent to conduct sound waves, making it difficult to achieve uniform and stable coupling in long, narrow holes. Furthermore, sound waves attenuate significantly over long distances, and the weak beam energy of the miniature probe results in a low signal-to-noise ratio, making defect signals easily obscured by complex geometric echoes. Flexible magnetic particle or penetrant testing methods are cumbersome, cause significant contamination, and are only effective for surface-opening defects; their final observation still depends on the performance of the endoscope.

[0006] Therefore, there is an urgent need for a detection device that can continuously perform full-length detection of deep-hole components, is not prone to jamming, and has high detection accuracy and efficiency. Summary of the Invention

[0007] The purpose of this invention is to solve the above-mentioned technical problems and provide a device for simultaneous measurement of the inner diameter and detection of inner wall defects in small-sized deep holes, so as to simultaneously measure the inner diameter of deep hole components and detect their inner wall defects.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0009] A device for measuring the inner diameter and detecting inner wall defects in small-sized deep holes includes a fixed sleeve assembly, an inner diameter measuring assembly, and an inner wall defect detection assembly.

[0010] The fixed sleeve assembly includes a first fixed sleeve and a second fixed sleeve, which are coaxially connected by a connector; the first fixed sleeve can move linearly along the axial direction of the hole to be tested.

[0011] The inner diameter measuring assembly includes a laser displacement meter, a reflector, and a rotary drive mechanism. The laser displacement meter extends into the first fixed sleeve, and the rotary drive mechanism is located in the second fixed sleeve with a reflector installed at its output end. The reflector is located in the measuring space formed between the first and second fixed sleeves. The reflecting surface of the reflector faces the inner wall of the hole to be measured. Driven by the rotary drive mechanism, the inner diameter measuring assembly rotates circumferentially along the hole to be measured, and the laser displacement meter measures the circumferential inner diameter of the hole. Simultaneously, driven by the first fixed sleeve, it moves axially along the hole to measure the inner diameter over the entire length of the hole.

[0012] The inner wall defect detection component is mounted on the second fixed sleeve and moves axially along the hole to be tested under the drive of the first fixed sleeve to detect defects in the inner wall of the hole.

[0013] The detection device described in this invention is mainly used to measure small-sized deep-hole components, which are holes with a diameter φ of 8-15mm and a depth of 200-1000mm.

[0014] Therefore, the outer diameters of the first and second fixing sleeves are the same, both being 6.5-13.5 mm.

[0015] In one feasible approach, the first fixed sleeve is driven to move axially along the hole to be tested by a feeding mechanism.

[0016] Furthermore, both the rotary drive mechanism and the feed mechanism are equipped with encoders.

[0017] Furthermore, the reflector is mounted on a reflector mount located at the output end of the rotary drive mechanism; the reflective surface of the reflector faces the laser emitting end of the laser displacement meter, reflecting the laser at a 45° angle.

[0018] In one feasible embodiment, the inner wall defect detection assembly includes an eddy current probe disposed at one end of the second fixed sleeve away from the first fixed sleeve; the eddy current probe is wound within a groove formed on the outer wall of the second fixed sleeve.

[0019] Furthermore, the eddy current probe is a Bobbin probe.

[0020] In one feasible embodiment, the device for measuring the inner diameter of small deep holes and detecting inner wall defects further includes a centering wheel assembly disposed inside a second fixed sleeve. The centering wheel assembly circumferentially abuts against the inner wall of the hole to be measured, thereby ensuring that the second fixed sleeve and the first fixed sleeve are smoothly fed axially within the hole to be measured.

[0021] Furthermore, the centering wheel assembly includes a mounting base, a telescopic rod, and a centering wheel:

[0022] The mounting base is disposed at the end of the second fixed sleeve away from the first fixed sleeve and is detachably connected to the second fixed sleeve. The mounting base is coaxially disposed with the second fixed sleeve. The mounting base includes a base and a support frame disposed at the center of the base.

[0023] The telescopic rods are at least three in number and are evenly distributed around the circumference of the support frame. The telescopic rods are telescopically installed in the mounting holes of the support frame in a direction perpendicular to the axis of the support frame.

[0024] The centering wheel is located at the end of the telescopic rod, and the axis of the centering wheel is perpendicular to the telescopic rod's extension direction. A through hole corresponding to the centering wheel is provided on the side wall of the second fixing sleeve, and the centering wheel can extend out of the through hole through the telescopic rod.

[0025] Furthermore, the telescopic rod includes a rod body and a compression spring. The rod body includes a connecting end and a free end. The connecting end is movably connected to the mounting base. The compression spring is sleeved on the rod body near the connecting end. The free end is connected to a centering wheel.

[0026] Furthermore, the aforementioned device for measuring the inner diameter of small deep holes and detecting inner wall defects also includes a first and a second wire-collecting slip ring; the first wire-collecting slip ring is coaxially connected to the laser displacement gauge; the second wire-collecting slip ring is sleeved on the outside of the rotary drive mechanism, and the outer wall of the second wire-collecting slip ring is interference-fitted with the inner wall of the second fixed sleeve; the output wire of the rotary drive mechanism is connected to the stator in the second wire-collecting slip ring, and the rotor wire of the second wire-collecting slip ring is connected to the rotor wire of the first wire-collecting slip ring.

[0027] The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes provided by this invention has the following beneficial effects:

[0028] 1. The device for simultaneous detection of inner diameter and inner wall defects in small-sized deep holes provided by the present invention integrates inner diameter measurement and inner wall defect detection elements and fixes each element on a fixed sleeve that is adapted to the inner diameter of the hole to be measured. During measurement, the fixed sleeve drives each element to penetrate into the hole, which solves the problems of insufficient adaptability of traditional probe size to pipe inner diameter, difficulty in penetrating into slender pipes, and probe jamming, improves detection efficiency, and realizes continuous detection of the entire length.

[0029] 2. The device for measuring the inner diameter of small deep holes and simultaneously detecting inner wall defects provided by the present invention uses a rotating reflector. Only one set of reflectors is used to complete the circumferential scanning of the laser optical path and measure the inner diameter. Compared with the existing technology of multiple laser emitting units or gear transmission multi-reflector designs, this device has a simple structure and is easy to operate. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the device for simultaneous detection of inner diameter and inner wall defects in small-sized deep holes according to the present invention.

[0031] Figure 2 for Figure 1 Internal structure diagram at point A;

[0032] Figure 3 This is a schematic diagram of the measurement component.

[0033] Figure 4 This is a schematic diagram of the overall structure of the centering wheel assembly;

[0034] Figure 5 This is a schematic diagram illustrating the combination of the present invention for measuring the inner diameter of small deep holes and the synchronous detection device for inner wall defects when used to measure deep hole components.

[0035] Reference numerals: 1. Fixed sleeve assembly; 11. First fixed sleeve; 12. Second fixed sleeve; 121. Through hole; 2. Connector; 21. Light-transmitting opening; 22. Wire groove; 3. Inner diameter measuring assembly; 31. Laser displacement gauge; 32. Reflector; 33. Rotary drive mechanism; 4. Inner wall defect detection assembly; 5. Hole to be measured; 6. Centering wheel assembly; 61. Mounting seat; 611. Base; 612. Support frame; 62. Telescopic rod; 621. Rod body; 622. Compression spring; 63. Centering wheel; 7. First wire feed slip ring; 8. Second wire feed slip ring; 9. Feed mechanism; 91. Feed motor; 92. Fixed seat; 93. Slider; 94. Guide rod; 10. Flange; 100. Mounting sleeve. Detailed Implementation

[0036] The following will be combined with the appendix Figure 1-5 The technical solutions of the various embodiments of the present invention have been clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] Example

[0038] This embodiment details a device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes.

[0039] like Figure 1 and Figure 3 As shown, a device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes includes a fixed sleeve assembly 1, an inner diameter measurement assembly 3, and an inner wall defect detection assembly 4.

[0040] The fixed sleeve assembly 1 is used to fix the inner diameter measuring assembly 3 and the inner wall defect detection assembly 4. It includes a first fixed sleeve 11 and a second fixed sleeve 12. The first fixed sleeve 11 and the second fixed sleeve 12 are coaxially connected by a connector 2. For ease of replacement and maintenance, the first fixed sleeve 11 and the second fixed sleeve 12 are preferably detachably connected.

[0041] This can be understood as follows: the rear end of the second fixing sleeve 12 is connected to the front end of the first fixing sleeve 11, and the first fixing sleeve 11 and the second fixing sleeve 12 are coaxially connected through the connector 2. Figure 2As shown, connector 2 is a hollow connecting rod. A ring of protrusions is provided on the outer peripheral walls of both ends of the hollow connecting rod. Grooves that match the protrusions are provided on the inner peripheral walls of the first fixing sleeve 11 and the second fixing sleeve 12. The three components are coaxially connected through the grooves and protrusions, and the first fixing sleeve 11, the second fixing sleeve 12, and the hollow connecting rod can rotate relative to each other through the grooves and protrusions. In use, the second fixing sleeve 12 and the first fixing sleeve 11 need to be sequentially inserted into the test hole 5 and moved linearly along the axial direction of the test hole 5.

[0042] In this invention, a small-sized deep hole refers to a hole 5 to be tested with an inner diameter φ of 8-15mm and a depth of 200-1000mm. The detection device is used to measure the inner diameter of the hole 5 to be tested and to detect defects in the inner wall of the hole 5 to be tested. Therefore, the first fixed sleeve 11 and the second fixed sleeve 12 are preferably the same in outer diameter, both being 6.5-13.5mm.

[0043] To enable the testing device to feed along the axis of the test hole 5, the first fixed sleeve 11 is driven to move axially along the test hole 5 by the feeding mechanism 9. Specifically, the feeding mechanism 9 is connected to the rear end of the first fixed sleeve 11 via a flange 10. More specifically, as... Figure 1 As shown, the feed mechanism 9 includes a feed motor 91, a fixed base 92 with a slide rail, a slider 93 adapted to the slide rail, and a guide rod 94. The slider 93 is connected to the flange 10. The feed motor 91 drives the slider 93 to move along the slide rail, the slider 93 drives the flange 10, and the flange 10 then drives the entire measuring device to move.

[0044] Furthermore, both the rotary drive mechanism 33 and the feed mechanism 9 are equipped with encoders.

[0045] Specifically, the rotary drive mechanism 33 is equipped with a rotary encoder, the rotary drive mechanism 33 is a coreless motor, and the feed mechanism 9 is equipped with a feed encoder; the feed motor can be a regular motor. In this way, the rotary encoder provides real-time feedback on the rotation speed and angle of the coreless motor, ensuring that the laser accurately completes continuous acquisition of the inner diameter data for one revolution (360°) during the rotation of the reflector 32. Furthermore, the feed encoder and rotary encoder form a closed-loop collaborative control system. The rotary encoder ensures no blind spots in circumferential detection, while the feed encoder controls the axial feed accuracy (the minimum feed amount matches the laser sampling frequency). The two work together to precisely alternate between circumferential rotation and axial feed motion, ultimately achieving continuous detection of the entire length of the deep-hole component without any omissions.

[0046] Combined Figure 2 and Figure 3As shown, the inner diameter measuring component 3 includes a laser displacement meter 31, a reflector 32, and a rotary drive mechanism 33. The laser displacement meter 31 extends into the first fixed sleeve 11 through a mounting sleeve 100, and the mounting sleeve 100 is interference-fitted with the first fixed sleeve 11. The rotary drive mechanism 33 is located in the second fixed sleeve 12, and the output end is equipped with a reflector 32. The reflector 32 is located in the measuring space formed between the first fixed sleeve 11 and the second fixed sleeve 12. The reflecting surface of the reflector 32 faces the inner wall of the hole to be measured 5. Under the drive of the rotary drive mechanism 33, the inner diameter measuring component 3 rotates circumferentially along the hole to be measured 5. The laser displacement meter 31 realizes the circumferential inner diameter measurement of the hole to be measured 5. At the same time, under the drive of the first fixed sleeve 11, it moves axially along the hole to be measured 5 to realize the inner diameter measurement of the entire length of the hole to be measured 5.

[0047] Here, the laser displacement meter 31 adopts the laser displacement meter in the prior art.

[0048] like Figure 1 As shown, the reflector 32 is mounted on the reflector mount (not shown in the figure) at the output end of the rotary drive mechanism 33. The reflecting surface of the reflector 32 faces the laser emitting end of the laser displacement meter 31 and reflects the laser at a 45° angle.

[0049] Specifically, the reflector 32 is an isosceles triangular prism, with its inclined surface serving as the reflecting surface, facing the laser emitting end of the laser displacement meter 31. The center of the inclined surface of the isosceles triangular prism is the laser incident point. The reflector base is interference-fitted and fixed to the hollow connecting rod. The reflector 32 is mounted on the reflector base and is located inside the hollow connecting rod. A light-transmitting opening 21 is provided on the side wall of the hollow connecting rod so that the laser reflected by the reflector 32 passes through the light-transmitting opening 21 and strikes the inner wall of the hole to be measured 5. When measuring the inner diameter, the rotary drive mechanism 33 drives the reflector 32 and the hollow connecting rod to rotate. The laser emitted from the laser displacement meter 31 strikes the reflector 32, and the reflector 32 then reflects the laser at a 45° angle onto the inner wall of the hole to be measured 5. Driven by the rotary drive mechanism 33, the inner diameter is measured by rotation.

[0050] The rotary drive mechanism 33 can be any drive mechanism that can drive the reflector 32 to rotate. Preferably, the rotary drive mechanism 33 is a rotary motor that is simple in structure and easy to operate.

[0051] When measuring the inner diameter, the laser emitted from the laser displacement meter 31 is incident on the center of the inclined surface of the isosceles triangular prism. The laser is reflected at 45° from the center of the inclined surface of the isosceles triangular prism and is directed perpendicularly to the inner wall of the hole to be measured 5. Driven by the rotation drive mechanism 33, the isosceles triangular prism rotates around the axis of the hole to be measured 5. The laser that is continuously incident on the inclined surface is continuously directed perpendicularly to the inner wall of the hole to be measured 5. After the reflector 32 rotates once, the laser displacement meter 31 collects the inner diameter of the hole to be measured 5 for one revolution.

[0052] Compared to existing technologies that typically require multiple laser emitting units or gear-driven multi-mirror designs when measuring the inner diameter of small deep holes, this device has a simple structure and is easy to operate.

[0053] For example Figure 1 As shown, the inner wall defect detection component 4 is mounted on the second fixed sleeve 12 and is used to move along the axial direction of the hole to be tested 5 under the drive of the first fixed sleeve 11 to detect defects in the inner wall of the hole to be tested 5.

[0054] Specifically, the inner wall defect detection component 4 includes an eddy current probe. In order to improve the efficiency of detecting minute defects, the eddy current probe is preferably a bobbin probe, which is located at the end of the second fixed sleeve 12 away from the first fixed sleeve 11.

[0055] More specifically, a groove is provided on the outer peripheral wall of the second fixed sleeve 12 away from the first fixed sleeve 11, and the eddy current probe is arranged around the groove formed on the outer peripheral wall of the second fixed sleeve 12. In this way, by adjusting the frequency, it can detect deep defects in the low frequency band and shallow defects in the high frequency band.

[0056] It should be noted that, to avoid interference from laser reflection during inner diameter measurement caused by the signal transmission line and conductive wire of the bobbin probe, thus affecting the accuracy of the inner diameter measurement, the bobbin probe of this invention can wirelessly receive signals. When the bobbin probe transmits signals via a wired connection, the wire transmission can be achieved through the following configuration of a first and a second wire slip ring.

[0057] To ensure smooth axial feeding of the second fixed sleeve 12 and the first fixed sleeve 11 within the test hole 5, one feasible solution is as follows: Figure 4 and Figure 5 As shown, the device for measuring the inner diameter of small deep holes and simultaneously detecting inner wall defects also includes a centering wheel assembly 6. The centering wheel assembly 6 is disposed inside the second fixed sleeve 12. The centering wheel assembly 6 abuts against the inner wall of the hole to be measured 5 in a circumferential manner, ensuring that the second fixed sleeve 12 and the first fixed sleeve 11 are smoothly fed axially inside the hole to be measured 5.

[0058] Specifically, the centering wheel assembly 6 includes a mounting base 61, a telescopic rod 62, and a centering wheel 63.

[0059] The mounting base 61 is located at one end of the second fixing sleeve 12 away from the first fixing sleeve 11 and is detachably connected to the second fixing sleeve 12. The mounting base 61 is coaxially arranged with the second fixing sleeve 12. The mounting base 61 includes a base 611 and a support frame 612 located at the center of the base 611.

[0060] Specifically, the base 611 and the support frame 612 can be fixedly connected by welding or other methods, or they can be detachably connected by bolts or other methods. For ease of replacement and maintenance, the base 611, the support frame 612, and the second fixing sleeve 12 are preferably detachably connected by threads. The support frame 612 can be a symmetrical structure such as a cylinder or an equilateral triangular prism. To fit the second fixing sleeve 12, the support frame 612 is preferably a cylinder.

[0061] There are at least three telescopic rods 62. According to the principle of three-point centering, the three telescopic rods 62 are evenly distributed around the support frame 612. The telescopic rods 62 are telescopically installed in the mounting holes opened in the support frame 612 in a direction perpendicular to the axis of the support frame 612.

[0062] Specifically, such as Figure 4 As shown, the telescopic rod 62 includes a rod body 621 and a compression spring 622. The rod body 621 includes a connecting end and a free end. The connecting end is movably connected to the support frame 612. The compression spring 622 is sleeved on the rod body 621 near the connecting end. The free end is connected to the centering wheel 63.

[0063] Combination Figure 1 As shown, a centering wheel 63 is located at the end of the telescopic rod 62. The axis of the centering wheel 63 is perpendicular to the telescopic direction of the telescopic rod 62. A through hole 121 corresponding to the centering wheel 63 is provided on the side wall of the second fixed sleeve 12. The centering wheel 63 can extend out of the through hole 121 through the telescopic rod 62.

[0064] This can be understood as follows: In the initial state, the centering wheel 63 extends out of the through hole 121, and the outer diameter of the ring formed by the three centering wheels 63 is larger than the inner diameter of the hole 5 to be measured. In the working state, the second fixing sleeve 12 extends into the hole 5 to be measured. Under the pressure of the hole 5, the centering wheel 63 is squeezed into the through hole 121 until the circumference of the centering wheel 63 is in contact with the inner wall of the hole 5. During the process of the centering wheel 63 being squeezed into the through hole 121, the centering wheel 63 drives the telescopic rod 62 to move radially along the support frame 612. When the telescopic rod 62 moves to its limit position, the centering wheel 63 compresses the compression spring 622. Under the action of the compression spring 622, the three centering wheels 63 are tightly pressed against the inner wall of the hole 5 to be measured, thus achieving centering of the entire device.

[0065] To avoid problems such as the rotary drive mechanism 33 rotating and winding, and the rotary drive mechanism 33's wiring blocking the laser emitted by the laser displacement meter 31 during the entire use of the device, such as Figure 1-2As shown, the entire device also includes a first slip ring 7 and a second slip ring 8; the output wire of the rotary drive mechanism 33 is connected to the stator in the second slip ring 8, the rotor output wire of the second slip ring 8 is connected to the rotor output wire of the first slip ring 7, and the stator output wire of the first slip ring 7 is connected to an external controller and power supply. Thus, during the measurement process, while the rotary drive mechanism 33 drives the reflector 32 to rotate, the first slip ring 7 and the second slip ring 8 drive the wiring to rotate, thereby avoiding obstruction of the laser emitted by the laser displacement gauge 31 and achieving effective measurement of the inner diameter of small-sized deep holes.

[0066] In a specific implementation, the first cable-collecting slip ring 7 is coaxially connected to the mounting sleeve 100 of the laser displacement gauge 31. For example, the stator of the first cable-collecting slip ring 7 can be coaxially connected to the mounting sleeve 100. The second cable-collecting slip ring 8 is sleeved on the outside of the rotary drive mechanism 33, and the outer wall of the second cable-collecting slip ring 8 is interference-fitted with the inner wall of the second fixed sleeve 12. The rotary drive mechanism 33 can be fixed inside the second fixed sleeve 12 by a bracket.

[0067] It should be noted that, in order to avoid interference from laser reflection during inner diameter measurement caused by the wires of the slip ring 7 and the limiting slip ring 8, thus affecting the accuracy of the inner diameter measurement, such as... Figure 1 and Figure 2 As shown, on the outer wall of the connector 2, there are two wire grooves 22 along the axial direction of the connector 2. They are arranged symmetrically with the axial direction of the connector 2 as the line of symmetry.

[0068] When using the device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes as described in this invention, the specific operations include the following:

[0069] S1, Assemble the entire testing device:

[0070] The centering wheel assembly 6, the inner diameter measuring assembly 3, and the inner wall defect detection assembly 4 are connected and fixed to the first fixed sleeve 11 and the second fixed sleeve 12. The end of the first fixed sleeve 11 away from the second fixed sleeve 12 is connected to the feeding mechanism 9. Then, the end of the second fixed sleeve 12 away from the first fixed sleeve 11 is inserted into the hole to be tested 5.

[0071] S2, simultaneously performs inner diameter measurement and inner wall defect detection:

[0072] Start the eddy current probe and feed mechanism 9. The feed mechanism 9 drives the eddy current probe to feed along the axis of the hole to be tested 5. During the feeding process, the eddy current probe generates an alternating magnetic field through alternating current, which induces eddy currents in the hole to be tested 5. When there is a defect, the eddy current distribution changes, resulting in a change in the composite magnetic field after the magnetic field is superimposed. Defect identification is achieved by analyzing the voltage signal output by the eddy current probe.

[0073] Simultaneously, the laser displacement meter 31 and the rotary drive mechanism 33 are activated. The rotary drive mechanism 33 drives the reflector 32 to rotate around the axis of the hole to be measured 5. The point laser emitted by the laser displacement meter 31 is reflected by the reflector 32 and is directed vertically toward the inner wall of the hole to be measured 5, so as to perform a rotational measurement of the inner diameter of the hole to be measured 5.

[0074] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention, and should be understood that the scope of protection of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed in this invention without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A device for simultaneous measurement of the inner diameter and detection of inner wall defects in small-sized deep holes, characterized in that, It includes a fixed sleeve assembly (1), an inner diameter measuring assembly (3), and an inner wall defect detection assembly (4): The fixed sleeve assembly (1) includes a first fixed sleeve (11) and a second fixed sleeve (12), which are coaxially connected by a connector (2); the first fixed sleeve (11) can move linearly along the axial direction of the hole to be tested (5). The inner diameter measuring component (3) includes a laser displacement meter (31), a reflector (32), and a rotary drive mechanism (33). The laser displacement meter (31) extends into the first fixed sleeve (11). The rotary drive mechanism (33) is located in the second fixed sleeve (12) and the output end is equipped with a reflector (32). The reflector (32) is located in the measuring space formed between the first fixed sleeve (11) and the second fixed sleeve (12). The reflector (32) faces the inner wall of the hole to be measured. Under the drive of the rotary drive mechanism (33), the inner diameter measuring component (3) rotates circumferentially along the hole to be measured (5) and realizes the circumferential inner diameter measurement of the hole to be measured (5) through the laser displacement meter (31). At the same time, under the drive of the first fixed sleeve (11), it moves axially along the hole to be measured (5) to realize the inner diameter measurement of the hole to be measured (5) over its entire length. The inner wall defect detection component (4) is mounted on the second fixed sleeve (12) and moves along the axial direction of the hole to be tested (5) under the drive of the first fixed sleeve (11) to detect the inner wall defects of the hole to be tested (5).

2. The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes according to claim 1, characterized in that, The outer diameters of the first fixed sleeve (11) and the second fixed sleeve (12) are the same, both being 6.5-13.5 mm.

3. The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes according to claim 1, characterized in that, The first fixed sleeve (11) is driven to move axially along the hole to be tested (5) by the feeding mechanism (9).

4. The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes according to claim 3, characterized in that, Both the rotary drive mechanism (33) and the feed mechanism (9) are equipped with encoders.

5. The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes according to claim 1, characterized in that, The reflector (32) is mounted on a reflector mount at the output end of the rotary drive mechanism (33); the reflective surface of the reflector (32) faces the laser emitting end of the laser displacement meter (31) and reflects the laser at a 45° angle.

6. The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes according to claim 1, characterized in that, The inner wall defect detection component (4) includes an eddy current probe, which is disposed at one end of the second fixed sleeve (12) away from the first fixed sleeve (11); the eddy current probe is wound in a groove formed on the outer side wall of the second fixed sleeve (12).

7. The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes according to any one of claims 1-6, characterized in that, It also includes a centering wheel assembly (6), which is disposed inside the second fixed sleeve (12). The centering wheel assembly (6) is circumferentially abutted against the inner wall of the hole to be tested (5) to ensure that the second fixed sleeve (12) and the first fixed sleeve (11) are smoothly axially fed inside the hole to be tested (5).

8. The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes according to claim 7, characterized in that, The centering wheel assembly (6) includes a mounting base (61), a telescopic rod (62), and a centering wheel (63): The mounting base (61) is located at one end of the second fixed sleeve (12) away from the first fixed sleeve (11) and is detachably connected to the second fixed sleeve (12). The mounting base (61) is coaxially arranged with the second fixed sleeve (12). The mounting base (61) includes a base (611) and a support frame (612) located at the center of the base (611). There are at least three telescopic rods (62), which are evenly distributed around the support frame (612). The telescopic rods (62) are telescopically installed in the mounting holes of the support frame (612) in a direction perpendicular to the axis of the support frame (612). The centering wheel (63) is located at the end of the telescopic rod (62). The axis of the centering wheel (63) is perpendicular to the telescopic direction of the telescopic rod (62). A through hole (121) corresponding to the centering wheel (63) is provided on the side wall of the second fixed sleeve (12). The centering wheel (63) extends out of the through hole (121) through the telescopic rod (62).

9. The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes according to claim 8, characterized in that, The telescopic rod (62) includes a rod body (621) and a compression spring (622). The rod body (621) includes a connecting end and a free end. The connecting end is movably connected to the support frame (612). The compression spring (622) is sleeved on the rod body (621) near the connecting end. The free end is connected to the centering wheel (63).

10. The device for simultaneous measurement of inner diameter and detection of inner wall defects in small-sized deep holes according to claim 7, characterized in that, It also includes a first wire-collecting slip ring (7) and a second wire-collecting slip ring (8); the first wire-collecting slip ring (7) is coaxially connected to the laser displacement meter (31); the second wire-collecting slip ring (8) is sleeved on the outside of the rotary drive mechanism (33), and the outer wall of the second wire-collecting slip ring (8) is interference-fitted with the inner wall of the second fixed sleeve (12); the output wire of the rotary drive mechanism (33) is connected to the stator in the second wire-collecting slip ring (8), and the rotor wire of the second wire-collecting slip ring (8) is connected to the rotor wire of the first wire-collecting slip ring (7).

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