Method and device for blind measurement of inner hole of underwater vertical deep hole channel of heavy water reactor

Abstract

The invention provides a blind measurement method for an inner hole of an underwater vertical deep hole channel of a heavy water reactor. The blind measurement method comprises the following steps: establishing a measurement zero reference surface; a working platform is established by taking a measurement zero reference surface as a reference, and three references are carried on the working platform; establishing an axis system with the measurement zero reference surface on the working platform; measuring the distance between the pre-measuring hole and the measuring zero reference surface; and measuring the diameter of the pre-measuring hole, wherein the diameter value is equal to the outer diameter value of a certain step of the inner diameter gauge. The invention further provides a heavy water reactor underwater vertical deep hole channel inner hole blind measurement device which comprises a working platform, a measuring scale, a positioning gauge and an inner diameter gauge. The device can safely and accurately measure the inner diameter size of the vertical deep hole channel in the heavy water reactor underwater high-irradiation environment, realizes blind measurement of the inner hole of the vertical deep hole channel in nuclear power heavy water reactor high-irradiation, remote and underwater measurement, realizes accurate contact measurement, is high in accuracy, is far away from the high-irradiation environment to the greatest extent, and greatly reduces the irradiation dose of operators.

Description

Technical Field

[0001] The invention relates to the technical field of heavy water reactor channel measurement, and in particular to a method and a device for blindly measuring the inner hole of an underwater vertical deep channel of a heavy water reactor. Background Art

[0002] In an existing vertical deep channel, when a positioning piece needs to be installed at a certain position of the channel to fix certain equipment, the diameter of the inner hole at this position of the channel needs to be measured.

[0003] At present, the commonly used deep hole inner diameter measurement methods are laser measurement method and mechanical measurement method. The principle of laser measurement method is that the laser transmitter emits a laser beam to illuminate the wall of the hole to be measured, and the receiver lens gathers the light reflected by the target and focuses it on the photosensitive element. Based on the principle of laser ranging triangulation measurement, the light path is changed by refraction and reflection to achieve the measurement of the inner diameter of the hole. Mechanical measurement method is a contact measurement method, which uses the displacement sensor probe rod of the measuring head to contact the inner wall of the deep hole to be measured, extracts the detection signal multiple times, and uses digital processing technology to convert the signal into a digital signal to obtain the measurement result.

[0004] There are a large number of narrow channels in the core of a nuclear power heavy water reactor that are more than ten meters deep and vertically pass through the heavy water environment of the reactor core. The diameters of these channels vary, and the diameters of the steps at different depths are different. Since the unit has been in operation for more than ten years, these channels may be deformed under long-term irradiation, and the relevant structural dimensions may be inconsistent with the original design parameters. Before using these channels, the size of their corresponding inner holes must be measured.

[0005] The commonly used laser measurement method and mechanical measurement method cannot be used to measure the inner hole of the deep channel of the heavy water reactor for the following reasons:

[0006] First, the laser measurement method is based on the principle of laser reflection. The flow of heavy water moderator in the reactor produces turbulence, which will greatly reduce the precision and accuracy of the measurement. The hole is more than ten meters deep and the peripheral dose rate is as high as 10 6 Gy / h. Existing radiation-resistant cameras cannot enter the core and cannot determine whether the laser reaches the exact position of the measured hole.

[0007] Second, the mechanical measurement method head sensor will reduce its measurement accuracy or even fail in the environment of heavy water moderator and high radiation; the complex head structure will bring out a large amount of high-dose rate heavy water moderator, threatening the life safety of the operator.

[0008] Conventional measurement methods can no longer meet the needs, and it is necessary to invent a new safe and accurate measurement method and equipment to meet the needs of high-irradiation, long-distance, underwater, and blind vertical deep channel measurements of nuclear power heavy water reactors. Summary of the invention

[0009] The purpose of the present invention is to provide a method and device for blindly measuring the inner hole of an underwater vertical deep channel of a heavy water reactor, which solves the problem of safely and accurately measuring the inner diameter size of the vertical deep channel in an underwater high-irradiation environment of a heavy water reactor.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A method for blindly detecting the inner hole of an underwater vertical deep channel of a heavy water reactor comprises the following steps:

[0012] Step 1: Establish the measurement zero reference plane;

[0013] Step 2: Using the measurement zero reference plane as the reference, establish a working platform with three references on it;

[0014] Step 3: Establish an axis system with the measurement zero reference plane on the working platform;

[0015] Step 4: Measure the distance between the pre-measurement hole and the measurement zero reference plane;

[0016] Step 5: Measure the diameter of the pre-measured hole. The expression of the diameter value is: diameter value = outer diameter value of a certain step of the inner diameter gauge.

[0017] In step 1, an extension device is set up based on the upper surface of the predicted measurement channel, the axis of the extension device coincides with the axis of the predicted measurement channel, and the upper surface of the extension device is perpendicular to the axis, which is used as the measurement zero reference plane.

[0018] In step 2, the first datum, the second datum, and the third datum are mounted on the working platform. The cross-sections of the three datums are parallel to the measurement zero datum plane. Bushings are vertically installed on each datum plane. The axes of the three bushings are coaxial, and the three bushings can slide freely on their respective datum planes.

[0019] Furthermore, the distance h between two adjacent benchmarks satisfies h=H / D, wherein H is the theoretical height of the predicted measuring hole from the zero base surface, and D is the diameter of the predicted measuring hole 2.

[0020] In step 3, the axis system for measuring the zero reference plane includes the axis of the coaxial stepped holes with different diameters, the axis of the eccentric holes with the same diameter but different axes, and the axis of the eccentric holes with different diameters and different axes.

[0021] In step 4, use a height measuring ruler and a positioning gauge for measurement. The measuring ruler passes through the first, second, and third datum upper sleeves of the working platform from top to bottom, and descends along the axis of the measured channel until the front positioning gauge stops at the upper step of the predicted measuring hole. At this time, the measured zero reference plane corresponds to a certain scale value on the measuring ruler. This value is the depth value of the predicted measuring hole from the zero reference plane.

[0022] In step 5, use the same measuring ruler to replace the positioning gauge with the inner diameter gauge, measure the inner diameter of the predicted measuring hole, and pass the measuring ruler through the first datum, the second datum, and the third datum upper sleeve of the working platform from top to bottom. When a certain step of the inner diameter gauge is the same as the predicted measuring hole diameter, the measuring ruler stops descending. At this time, the measured zero reference surface corresponds to a certain scale value on the measuring ruler. According to the scale value, it is calculated which step of the inner diameter gauge is the same as the predicted measuring hole diameter, thereby obtaining the predicted measuring hole diameter size.

[0023] Furthermore, under the same measurement depth, the step diameter D of the inner diameter gauge n With step height L n The relationship is as follows:

[0024] L n =0.8cm, when D = φ5cm~φ8cm;

[0025] L n =1.2cm, when D = φ8.5cm~φ12cm;

[0026] L n =1.5cm, when D = φ12.5cm~φ16cm;

[0027] L n =2cm, when D = φ16.5cm~φ20cm;

[0028] L n =2.3cm, when D =φ20.5cm~φ25cm.

[0029] Furthermore, when the measuring depth changes, the height L of each step of the inner diameter gauge n The height H from the zero base surface of the measured hole satisfies L n =H / 10; the decreasing difference of each step diameter of the inner diameter gauge D n -D n-1 The height H of the zero base surface measured from the pre-measured hole satisfies (3~5) / 1000=(D n -D n-1 ) / 2H.

[0030] In addition, the present invention provides a blind detection device for the inner hole of an underwater vertical deep channel of a heavy water reactor, comprising:

[0031] The extension device is installed on the upper plane of the pre-measured hole, the axis of the extension device coincides with the axis of the pre-measured hole, and the upper plane of the extension device is perpendicular to the axis of the pre-measured hole;

[0032] The working platform is equipped with the first datum, the second datum and the third datum. The cross-sections of the three datums are parallel to the measurement zero datum plane. Axle sleeves are vertically installed on each datum plane. The axes of the three sleeves are coaxial and the three sleeves can slide freely on their respective datum planes.

[0033] The measuring ruler is composed of several sections of rods with precise scales, which are assembled together axially and radially from head to tail according to the measurement requirements;

[0034] The positioning gauge has a tail end that is detachably assembled with the measuring ruler in the axial and radial directions, a head that is wide at the top and narrow at the bottom, a wide end with a diameter larger than the predicted measuring hole, and a narrow end with a diameter smaller than the predicted measuring hole;

[0035] The tail end of the inside diameter gauge is the same as that of the positioning gauge, and it can be detachably assembled with the measuring ruler axially and radially. The head consists of a series of steps with decreasing sizes from top to bottom. The value of the distance between the mounting surface of the inside diameter gauge and a certain step surface is the same as the value of the distance between the mounting surface of the positioning gauge and the positioning step.

[0036] Compared with the prior art, the method and device for blind detection of the inner hole of the underwater vertical deep channel of a heavy water reactor provided by the present invention has the following beneficial effects:

[0037] The present invention can safely and accurately measure the inner diameter of a vertical deep channel in a heavy water reactor underwater high-irradiation environment, realize blind measurement of the inner hole of a vertical deep channel in a nuclear power heavy water reactor with high irradiation, long distance and underwater measurement, precise contact measurement with high accuracy, and maximum distance from the high-irradiation environment, greatly reducing the radiation dose of operators.

[0038] The present invention establishes a measurement system for blind measurement of inner holes at any depth of a vertical deep channel, and comprehensively summarizes the inner diameter measurement methods and related parameter selection of holes with different diameters (according to the summarized formulas, different parameters can be substituted to obtain the selection of other parameters under different conditions), which is convenient for targeted specific measurement and has guiding significance for various deep hole blind measurements in the future. The present invention provides a method for measuring the diameter of a hole using different tools through steps 1 to 5.

[0039] Furthermore, the present invention obtains the inner diameter gauge step diameter D n With step height L n The setting of the internal hole diameter and its relationship with the theoretical diameter D of the measured hole provide a theoretical basis for the measurement of various internal hole diameters.

[0040] Furthermore, the present invention obtains the height L of each step of the inner diameter gauge n The relationship formula between the measured hole and the zero base surface height H is set to provide a theoretical basis for measuring the internal hole diameters of various depths.

[0041] Furthermore, the present invention obtains the decreasing difference D of each step diameter of the inner diameter gauge n -Dn-1 The relationship formula between the height H of the zero base surface and the predicted hole provides a theoretical basis for measuring the diameter of internal holes at various depths. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the present invention, the drawings required for the description are briefly introduced below.

[0043] Figure 1 It is a schematic diagram of a vertical deep channel of a heavy water reactor in the prior art;

[0044] Figure 2 for Figure 1 The enlarged view of point Ⅰ in the middle;

[0045] Figure 3 for Figure 1 The enlarged view of the middle II;

[0046] Figure 4 A schematic diagram of the relationship between the pre-measured channel and the zero reference plane provided by the present invention;

[0047] Figure 5 A schematic diagram of a working platform provided by the present invention;

[0048] Figure 6 A schematic diagram of the positional relationship between the pre-measurement hole and the positioning gauge provided by the present invention;

[0049] Figure 7 A schematic diagram of the connection between the measuring ruler and the positioning gauge provided by the present invention;

[0050] Figure 8 A schematic diagram of the connection between the measuring ruler and the inner diameter gauge provided by the present invention;

[0051] Fig. 9 A schematic diagram of the dimensions of the inner diameter gauge provided by the present invention, wherein Dx is the diameter of the step of the inner diameter gauge; Lx is the length of the step of the inner diameter gauge, wherein x means an arbitrary or random step of the inner diameter gauge;

[0052] Fig.10 A schematic diagram of a blind hole detection method for a pre-measurement hole provided by the present invention;

[0053] Fig.11 for Fig.10 Enlarged view of point III in the middle.

[0054] Description of reference numerals:

[0055] 1. Pre-measurement channel; 2. Pre-measurement hole; 3. Extension device; 4. Zero reference plane; 5. Working platform; 6. First reference; 7. Second reference; 8. Third reference; 9. Measuring ruler; 10. Positioning gauge; 11. Inner diameter gauge; 12. Bushing. DETAILED DESCRIPTION

[0056] The following is further explained in detail through specific implementation methods.

[0057] like Figures 2 to 11 As shown, the present invention provides a method for blindly detecting the inner hole of an underwater vertical deep channel of a heavy water reactor, and the steps are as follows:

[0058] Step 1: Establish the measurement zero reference plane 4 as the reference plane for subsequent measurements. Figure 1 The axis of the pre-measured hole 1 is extended upward, and a reference plane is established perpendicular to the extended axis as the measurement zero reference plane 4. The upper surface of the pre-measured hole 1 has different shapes, and the inclined or shaped surface cannot be used as the measurement reference plane. Therefore, it is necessary to establish an upward extension device 3 on the basis of the upper surface of the pre-measured hole 1, and the axis of the extension device 3 coincides with the axis of the pre-measured hole 1. The upper surface of the extension device 3 is perpendicular to the axis, which is used as the measurement zero reference plane 4 for measurement.

[0059] Step 2: With the measurement zero reference plane 4 as the reference, establish a working platform 5. This platform carries three references, namely the first reference 6, the second reference 7, and the third reference 8: the three reference cross-sections are parallel to the measurement zero reference plane 4, and the axes of the sleeves 12 installed vertically on the reference planes are coaxial during installation and can slide freely on their respective reference planes. After sliding, the axes are parallel. The distance h between the three reference planes depends on the depth H and diameter D of the measured hole, and the relationship between the three satisfies the following relationship:

[0060] h=H / D

[0061] Where h is the distance between three adjacent benchmarks (meters);

[0062] H is the theoretical height (m) of the pre-measurement hole 2 from the zero base surface 4;

[0063] D is the diameter of the predicted measuring hole 2 (cm).

[0064] Step 3: Establish an axis system with the measurement zero reference plane 4 on the work platform 5. With the zero reference plane 4 as the reference, establish the axis system reference: The conditions of the pre-measured holes 1 vary, and they are roughly divided into coaxial stepped holes with different diameters, eccentric holes with the same diameter but different axes, or different diameters but different axes. The axes of these holes are parallel to each other and perpendicular to the measurement zero reference plane 4, and can all be classified as the axis system of the measured hole.

[0065] Step 4: Measure the distance between the predicted hole 2 and the zero reference plane 4. Taking the axis system of the predicted hole 1 as the reference, first measure the precise height of the predicted hole 2 from the zero reference plane: the measuring ruler 9 and the positioning gauge 10 are installed together, and the height measuring ruler 9 and the positioning gauge 10 are used for measurement, wherein the height measuring ruler 9 is composed of several sections of rods with precise scales. According to the measurement requirements, the axial and radial directions between the head and the tail are assembled together with high precision to form a standard measuring ruler of sufficient length for a unique axis. The diameter of the measuring ruler 9 is the same as the inner diameter of the shaft sleeve 12. The positioning gauge 10 is installed at the front end of the height measuring ruler, and its head is wide at the top and narrow at the bottom. The diameter of the wide end is larger than the measured hole, and the diameter of the narrow end is smaller than the predicted hole 2.

[0066] The measuring ruler 9 passes through the sleeve 12 on the first datum 6, the second datum 7, and the third datum 8 of the working platform, and descends along the axis of the measured channel 1 until the front positioning gauge 10 stops at the upper step of the pre-measured hole 2. At this time, the measured zero reference surface 4 corresponds to a certain scale value on the measuring ruler 9, and this value is the depth value of the pre-measured hole 2 from the zero reference surface 4.

[0067] Step 5: Measure the diameter of the pre-measured hole 2. The same shaft system datum, the same measuring ruler 9, with the inner diameter gauge 11, measure the inner diameter of the pre-measured hole 2: Use the same working platform 5, first datum 6, second datum 7, third datum 8, shaft sleeve 12 and measuring ruler 9. The front positioning gauge 10 is replaced with the inner diameter gauge 11. The inner diameter gauge 11 consists of multiple steps with decreasing size from top to bottom: D n , D n-1 , D n-2 ......D......D p-2 , D p-1 , D p , the height of each step is L n , L n-1 , L n- 2......L......L p-2 , L p-1 , L p . D is the theoretical diameter of the predicted hole 2. The distance between the mounting surface of the inner diameter gauge 11 and the step surface D (the cylindrical step with a diameter of D) is the same as the distance between the mounting surface of the positioning gauge 10 and the positioning step. When a step of the inner diameter gauge 11 is the same as the diameter of the predicted hole 2, the measuring ruler 9 stops descending. At this time, the measuring zero reference surface 4 corresponds to a scale value on the measuring ruler 9. Based on this scale value, it is possible to calculate which step of the inner diameter gauge 11 is the same as the diameter of the predicted hole 2, thereby obtaining the diameter of the predicted hole 2.

[0068] Among them, under the same measurement depth, the inner diameter gauge 11 step diameter D n With step height L n Setting, step height L nThe relationship between the theoretical diameter D of the predicted hole and the predicted hole diameter D is as follows:

[0069] L n =0.8cm, when D = φ5cm~φ8cm;

[0070] L n =1.2cm, when D = φ8.5cm~φ12cm;

[0071] L n =1.5cm, when D = φ12.5cm~φ16cm;

[0072] L n =2cm, when D = φ16.5cm~φ20cm;

[0073] L n =2.3cm, when D =φ20.5cm~φ25cm.

[0074] When the diameter of the pre-measured hole remains unchanged and the measured depth changes, the height of each step of the inner diameter gauge 11 is L n There is the following corresponding relationship with the height H of the measured hole from the zero base surface (it should be noted that the above formula is how to select Ln when the predicted hole diameter is different at the same measurement depth; the following formula is how to select Ln when the predicted hole diameter remains unchanged and the measurement depth changes):

[0075] L n =H / 10

[0076] Among them, L n The unit is centimeters; the unit of H is meters.

[0077] Internal diameter gauge 11, the decreasing difference of each step diameter D n -D n-1 The following corresponding relationship exists between the height H of the zero base surface 4 measured from the pre-measured hole 2:

[0078] (3~5) / 1000=(D n -D n-1 ) / 2H

[0079] Among them, D n -D n-1 The unit is millimeters; the unit of H is meters.

[0080] Measure the diameter of the predicted hole, and the expression of the diameter value is: predicted hole diameter value = outer diameter value Dx of a certain step of the inner diameter gauge.

[0081] In addition, the present invention also provides a blind detection device for the inner hole of an underwater vertical deep channel of a heavy water reactor, comprising an extension device 3, a working platform 5, a measuring ruler 9, a positioning gauge 10, and an inner diameter gauge 11.

[0082] The overall structure of the extension device 3 is a stainless steel hollow cylindrical structure with a positioning flange at the bottom, which can be installed on the upper end surface of the pre-measurement channel 1. It is installed on the upper plane of the pre-measurement channel 1, with the axis coinciding with the axis of the pre-measurement hole 2, and the upper plane is perpendicular to the axis of the pre-measurement hole 2, which serves as the measurement zero reference plane 4.

[0083] The working platform 5 is installed on the artificial operation platform of the heavy water reactor where the deep channel is located, and the bottom surface of the platform is lower than the extension device 3. The working platform 5 is an aluminum alloy assembly structure, consisting of a bottom plate, a column and three reference platforms. The working platform 5 is equipped with three reference platforms: the first reference 6, the second reference 7, and the third reference 8. The three reference platforms are parallel to the zero reference plane 4 respectively. The shaft sleeves 12 vertically installed on the reference planes 6, 7, and 8 are coaxial and can slide freely on their respective reference planes. After sliding, the axes of the shaft sleeves are parallel.

[0084] The measuring ruler 9 is composed of several sections of rods with precise scales, which are assembled together according to the measurement requirements with high axial and radial precision (axial and radial straightness with 0.3 mm / 12 m precision) to form a standard measuring ruler of sufficient length with a single axis. The diameter of the measuring ruler 9 is the same as the inner diameter of the shaft sleeve 12.

[0085] The positioning gauge 10 is a coaxial solid cylinder with two different diameters. The end with the larger diameter can be connected to the measuring ruler by a thread. It is assembled with the measuring ruler 9 with high axial and radial precision (straightness 0.3 mm / 12 m accuracy). The outer diameter of the end with the larger diameter is larger than the predicted measuring hole, and the outer diameter of the end with the smaller diameter is smaller than the predicted measuring hole. A positioning step surface is formed between the cylinder with the larger diameter and the cylinder with the smaller diameter.

[0086] The inner diameter gauge 11 is a solid cylinder with multiple coaxial sections and different diameters. The tail end is the same as the tail end of the positioning gauge 10, and can be assembled with the measuring ruler 9 in the axial and radial directions with high precision. The head is composed of a series of steps with decreasing sizes from top to bottom. The distance between the mounting surface of the inner diameter gauge 11 and a certain step surface is the same as the distance between the mounting surface of the positioning gauge 10 and the positioning step.

[0087] For example, Figures 1 to 4 As shown, the inner diameter of the hole 2 at some positions of the pre-measured channel 1 (pre-measured heavy water reactor vertical deep channel) is different in size, the depth is uncertain, and the position of the plane on the channel is uncertain or it is a special-shaped surface, which cannot be used as a measurement reference surface. Therefore, an upward extension is established on the upper surface of the pre-measured channel 1, and an extension device 3 is installed. The axis of the extension device 3 coincides with the axis of the measured hole 2, and the upper plane of the extension device 3 is perpendicular to the axis of the measured hole 2. The upper plane of the extension device 3 is used as the zero reference surface 4 for measurement.

[0088] like Figure 5As shown, a working platform 5 is established, and three reference platforms are mounted on the platform: the first reference 6, the second reference 7, and the third reference 8. The three reference surfaces are parallel to the measurement zero reference surface 4, and the axes of the three positioning sleeves 12 are coaxial, and are parallel or coaxial with the extension line of the axis of the measured hole 2. The distance h between the three reference surfaces depends on the depth H and the diameter D of the measured hole, and the relationship between the three satisfies the following relationship:

[0089] h=H / D

[0090] Where h is the distance between three adjacent benchmarks (meters);

[0091] H is the theoretical height (m) of the pre-measurement hole 2 from the zero base surface 4;

[0092] D is the diameter of the predicted measuring hole 2 (cm).

[0093] The theoretical value of the diameter of the predicted measuring hole 2 is φ13.5 cm, the theoretical height of the predicted measuring hole 2 from the zero base surface 4 is 15 m, and the distance h between the three reference surfaces is 0.9 m.

[0094] like Figures 6 to 8 As shown, based on the axis system of the predicted measuring hole 2, first measure the precise height of the predicted measuring hole 2 from the zero reference plane 4: use a measuring ruler 9 and a positioning gauge 10, where the measuring ruler 9 is composed of several sections of rods with precise scales. According to the measurement requirements, the axial and radial directions between the head and tail are assembled together with high precision to form a standard measuring ruler of sufficient length for a unique axis. The diameter of the measuring ruler is the same as the inner diameter of the sleeve 12. The positioning gauge 10 is installed at the front end of the height measuring ruler, and its head is wide at the top and narrow at the bottom. The diameter of the wide end is larger than the measured hole, and the diameter of the narrow end is smaller than the predicted measuring hole 2. The diameter of the predicted measuring channel 1 is φ162mm, and the theoretical value of the diameter of the predicted measuring hole 2 is φ135mm. The large diameter of the positioning gauge head is φ160mm, and the small diameter is φ125mm.

[0095] The measuring ruler 9 is restrained by the sleeve 12 on the first datum 6, the second datum 7, and the third datum 8 of the working platform, and descends along the measured channel 1 until the front positioning gauge 10 stops at the upper step of the pre-measured hole 2. At this time, the measured zero reference surface 4 corresponds to a certain scale value on the measuring ruler 9, and this value is the depth value of the pre-measured hole 2 from the zero reference surface 4. The measured depth value is 9062mm.

[0096] like Figures 9 to 11 As shown, the same shaft system reference is used, with the same measuring ruler 9 and the inner diameter gauge 11, to measure the inner diameter of the pre-measured hole 2: the same working platform 5, reference 678, shaft sleeve 12 and measuring ruler 9 are used. The front positioning gauge 10 is replaced with the inner diameter gauge 11. The inner diameter gauge 11 consists of multiple steps with decreasing size from top to bottom: D n , D n-1 , D n-2......D......D p-2 , D p-1 , D p , the height of each step is L n , L n-1 , L n-2 ......L......L p-2 , L p-1 , L p . (D is the theoretical diameter value of the predicted measuring hole 2).

[0097] According to the inner diameter gauge 11 step diameter D n With step height L n The setting of has the following relationship with the D value of the measured hole:

[0098] L n =0.8cm, when D = φ5cm~φ8cm;

[0099] L n =1.2cm, when D = φ8.5cm~φ12cm;

[0100] L n =1.5cm, when D = φ12.5cm~φ16cm;

[0101] L n =2cm, when D = φ16.5cm~φ20cm;

[0102] L n =2.3cm, when D =φ20.5cm~φ25cm.

[0103] The inner diameter gauge has a total of six steps, with diameters of φ135.2mm, φ135.1mm, φ135mm, φ134.9mm, φ134.8mm, and φ134.7mm respectively.

[0104] According to the inner diameter gauge 11, the diameter of each step decreases by the difference D n -D n-1 The following corresponding relationship exists between the height H of the pre-measured hole 2 and the zero base surface 4:

[0105] (3~5) / 1000=(D n -D n-1 ) / 2H

[0106] Among them, D n -D n-1 The unit is millimeters; the unit of H is meters.

[0107] The corresponding step lengths are 1.5 cm.

[0108] The distance between the mounting surface of the inner diameter gauge 11 and the step surface D is the same as the distance between the mounting surface of the positioning gauge 10 and the positioning step. When a certain step of the inner diameter gauge 11 is the same as the actual diameter of the predicted hole 2, the measuring ruler 9 stops descending, and the zero reference surface 4 corresponds to a certain scale value on the measuring ruler 9. According to this scale value, it can be calculated which step of the inner diameter gauge 11 is the same as the diameter of the predicted hole 2, thereby obtaining the diameter of the predicted hole 2. The actual measured height value is 9077mm. According to the length of the step of the inner diameter gauge 11, which is 1.5cm, the actual diameter of the predicted hole 2 is φ134.9mm.

[0109] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for blindly testing the inner hole of an underwater vertical deep channel of a heavy water reactor, characterized in that: The following steps are involved: Step 1: Establish the measurement zero reference plane; Step 2: Using the measurement zero reference plane as the reference, establish a working platform with three references on it; Step 3: Establish an axis system with the measurement zero reference plane on the working platform; Step 4: Measure the distance between the pre-measurement hole and the measurement zero reference plane; Step 5: Measure the diameter of the predicted hole. The expression of the diameter value is: predicted hole diameter value = outer diameter value Dx of a certain step of the inner diameter gauge.

2. The method for blindly testing the inner hole of an underwater vertical deep channel of a heavy water reactor according to claim 1, characterized in that: In step 1, an extension device is set up based on the upper surface of the predicted measurement channel, the axis of the extension device coincides with the axis of the predicted measurement channel, and the upper surface of the extension device is perpendicular to the axis, which is used as the measurement zero reference plane.

3. The method for blindly testing the inner hole of an underwater vertical deep channel of a heavy water reactor according to claim 1, characterized in that: In step 2, the first datum, the second datum, and the third datum are mounted on the working platform. The cross-sections of the three datums are parallel to the measurement zero datum plane. Bushings are vertically installed on each datum plane. The axes of the three bushings are coaxial, and the three bushings can slide freely on their respective datum planes.

4. The method for blindly testing the inner hole of an underwater vertical deep channel of a heavy water reactor according to claim 3, characterized in that: The distance h between two adjacent benchmarks satisfies h=H / D, where H is the theoretical height of the predicted measuring hole from the zero base surface, and D is the diameter of the predicted measuring hole 2.

5. The method for blindly testing the inner hole of an underwater vertical deep channel of a heavy water reactor according to claim 1, characterized in that: In step 3, the axis system for measuring the zero reference plane includes the axis of the coaxial stepped holes with different diameters, the axis of the eccentric holes with the same diameter but different axes, and the axis of the eccentric holes with different diameters but different axes.

6. The method for blindly testing the inner hole of an underwater vertical deep channel of a heavy water reactor according to claim 1, characterized in that: In step 4, use a height measuring ruler and a positioning gauge for measurement. The measuring ruler passes through the first, second, and third datum upper sleeves of the working platform from top to bottom, and descends along the axis of the measured channel until the front positioning gauge stops at the upper step of the predicted measuring hole. At this time, the measured zero reference plane corresponds to a certain scale value on the measuring ruler. This value is the depth value of the predicted measuring hole from the zero reference plane.

7. The method for blindly testing the inner hole of an underwater vertical deep channel of a heavy water reactor according to claim 6, characterized in that: In step 5, use the same measuring ruler to replace the positioning gauge with the inner diameter gauge, measure the inner diameter of the predicted measuring hole, and the measuring ruler passes through the first datum, the second datum, and the third datum upper sleeve of the working platform from top to bottom. When a certain step of the inner diameter gauge is the same as the predicted measuring hole diameter, the measuring ruler stops descending. At this time, the measured zero reference surface corresponds to a certain scale value on the measuring ruler. According to the scale value, it is calculated which step of the inner diameter gauge is the same as the predicted measuring hole diameter, thereby obtaining the predicted measuring hole diameter size.

8. The method for blindly testing the inner hole of an underwater vertical deep channel of a heavy water reactor according to claim 7, characterized in that: Under the condition of the same measuring depth, the step diameter D of the inner diameter gauge n With step height L n The relationship is as follows: L n =0.8cm, when D = φ5cm~φ8cm; L n =1.2cm, when D = φ8.5cm~φ12cm; L n =1.5cm, when D = φ12.5cm~φ16cm; L n =2cm, when D = φ16.5cm~φ20cm; L n =2.3cm, when D =φ20.5cm~φ25cm.

9. The method for blindly testing the inner hole of an underwater vertical deep channel of a heavy water reactor according to claim 8, characterized in that: When the measuring depth changes, the height L of each step of the inner diameter gauge n The height H from the zero base surface of the measured hole satisfies L n =H / 10; the decreasing difference of each step diameter of the inner diameter gauge D n -D n-1 The height H of the zero base surface measured from the pre-measured hole satisfies (3~5) / 1000=(D n -D n-1 ) / 2H.

10. A blind detection device for the inner hole of an underwater vertical deep channel of a heavy water reactor, characterized in that: include: The extension device is installed on the upper plane of the pre-measured hole, the axis of the extension device coincides with the axis of the pre-measured hole, and the upper plane of the extension device is perpendicular to the axis of the pre-measured hole; The working platform is equipped with the first datum, the second datum and the third datum. The cross-sections of the three datums are parallel to the measurement zero datum plane. Axle sleeves are vertically installed on each datum plane. The axes of the three sleeves are coaxial and the three sleeves can slide freely on their respective datum planes. The measuring ruler is composed of several sections of rods with precise scales, which are assembled together axially and radially from head to tail according to the measurement requirements; The positioning gauge has a tail end that is detachably assembled with the measuring ruler in the axial and radial directions, a head that is wide at the top and narrow at the bottom, a wide end with a diameter larger than the predicted measuring hole, and a narrow end with a diameter smaller than the predicted measuring hole; The tail end of the inside diameter gauge is the same as that of the positioning gauge, and it can be detachably assembled with the measuring ruler axially and radially. The head consists of a series of steps with decreasing sizes from top to bottom. The value of the distance between the mounting surface of the inside diameter gauge and a certain step surface is the same as the value of the distance between the mounting surface of the positioning gauge and the positioning step.

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