Tube plate tube hole groove depth and coaxiality measuring device and measuring method

Abstract

The invention discloses a tube plate tube hole groove depth and coaxiality measuring device and method.The measuring device comprises a support, a five-direction measuring base, a dial indicator body, a measuring needle and a spring, the support comprises a mandrel, an upper flat plate and a vertical plate, the upper flat plate is provided with a shaft hole, and the vertical plate is provided with a shaft hole; the upper flat plate is sleeved on the measuring rod of the dial indicator body through the shaft hole, the spring and the five-direction measuring seat are sequentially sleeved on the measuring rod of the dial indicator body and located below the upper flat plate, the measuring pin is installed on the side edge of the five-direction measuring seat so that the measuring pin is perpendicular to the measuring rod of the dial indicator body, and the axis of the mandrel is parallel to the axis of the upper flat plate. A key groove is formed in the lower end of the mandrel and used for containing the probe. The device and the method for measuring the depth and the coaxiality of the groove of the tube hole of the tube plate are simple and convenient, and can realize the measurement of the depth and the coaxiality of the groove of a part.

Description

Technical Field

[0001] This invention relates to a device for measuring the depth and coaxiality of tube hole grooves in tube sheets, belonging to the field of nuclear power equipment technology. Background Technology

[0002] High-temperature gas-cooled reactors are currently the most advanced fourth-generation nuclear power technology in the world, characterized by inherent safety features, long design life, high operating temperature, and high manufacturing standards and technical requirements.

[0003] Compared to the steam generators of the previous three generations of nuclear power systems, the steam generator of the high-temperature gas-cooled reactor has two additional annular grooves in the main steam tube sheet. The dimensions of these annular grooves have high requirements. During the manufacturing and quality inspection process, the dimensions of these annular grooves need to be accurately measured to ensure the safe use of the high-temperature gas-cooled reactor.

[0004] However, existing dial gauges can only measure the inner diameter of the entire circumference and have insufficient range, making them difficult to remove. In addition, they cannot directly measure the depth of the groove. If the groove depth is calculated by dividing the difference between the two inner diameters by 2, the measurement error is large due to the concentricity of the grooves, which is difficult to meet the testing requirements.

[0005] Therefore, it is necessary to conduct in-depth research on existing measuring devices for tube hole depth and coaxiality in order to solve the above problems. Summary of the Invention

[0006] To overcome the above problems, in-depth research was conducted, and a device for measuring the depth and coaxiality of tube hole grooves in tube sheets was designed. This device includes a support 1, a five-axis measuring base 2, a dial indicator body 31, a measuring stylus 32, and a spring 4.

[0007] The support 1 includes a spindle 11, an upper plate 12, and a vertical plate 13. The upper plate 12 is provided with a shaft hole 121, through which the upper plate 12 is sleeved onto the measuring rod of the dial indicator body 31.

[0008] The spring 4 and the five-way measuring base 2 are sequentially sleeved on the measuring rod of the dial indicator body 31 and are located below the upper plate 12.

[0009] The probe 32 is mounted on the side of the five-way measuring base 2, such that the probe 32 is perpendicular to the measuring rod of the dial indicator body 31.

[0010] The axis of the mandrel 11 is parallel to the axis of the upper plate 12. A keyway 111 is provided at the lower end of the mandrel 11 to accommodate the probe 32.

[0011] In a preferred embodiment, the mandrel 11 is cylindrical, and the diameter of the mandrel cross section corresponds to the diameter of the tube hole 9.

[0012] In a preferred embodiment, the shaft hole 121 is perpendicular to the axis of the mandrel 11 and the two axes intersect.

[0013] In a preferred embodiment, a threaded hole 122 is provided on the side wall of the upper plate 12. The threaded hole 122 communicates with the shaft hole 121. The support 1 locks the dial indicator body 31 through the engagement of the threaded hole 122 and the bolt.

[0014] In a preferred embodiment, the measuring device further includes a probe thread adapter 5 for extending the length of the probe.

[0015] In a preferred embodiment, the difference between the radius of the probe's ball head and the radius of the probe's post is greater than the maximum depth of the groove inside the tube hole by at least 0.4 mm.

[0016] In a preferred embodiment, an adjusting shim 6 is provided between the upper plate 12 and the five-way measuring base 2. The preload of the spring is adjusted by selecting a reasonable adjusting shim thickness.

[0017] This invention also discloses a method for measuring the depth and coaxiality of tube hole grooves in a tube sheet, using the measuring device described above, and comprising the following steps:

[0018] Press the five-way probe upwards to fully insert the ball head of the probe into the keyway of the spindle;

[0019] Insert the mandrel into the tube hole and loosen the five-way probe base so that the probe ball head can fully contact the tube hole wall;

[0020] Zero the dial indicator;

[0021] Slowly push the measuring device so that the probe ball head enters the inner groove area;

[0022] Rotate the measuring device one revolution and record the maximum and minimum values ​​of the dial indicator during the process. Based on the maximum and minimum values, obtain the depth of the inner groove and the coaxiality of the inner groove.

[0023] In a preferred embodiment, the depth of the groove is expressed as:

[0024] D = [Xmin ~ Xmax];

[0025] Where D represents the depth of the groove, Xmin represents the minimum value of the dial gauge, and Xmax represents the maximum value of the dial gauge.

[0026] In a preferred embodiment, the coaxiality of the inner groove is expressed as:

[0027] δ=Xmax - Xmin

[0028] Where δ represents the coaxiality δ of the inner groove.

[0029] The beneficial effects of this invention include:

[0030] 1) The device is simple, convenient, and easy to operate; it can be completed by one person independently.

[0031] 2) The device has high detection efficiency, is easy to implement, and has high accuracy;

[0032] 3) It can measure the depth of grooves and coaxiality of parts. Attached Figure Description

[0033] Figure 1 A front view schematic diagram of a tube sheet tube hole groove depth and coaxiality measuring device according to a preferred embodiment of the present invention is shown.

[0034] Figure 2 A side view schematic diagram of a tube sheet bore groove depth and coaxiality measuring device according to a preferred embodiment of the present invention is shown.

[0035] Figure 3 A side view schematic diagram of the support for a tube sheet bore groove depth and coaxiality measuring device according to a preferred embodiment of the present invention is shown.

[0036] Figure 4 A top view schematic diagram of a support for a tube sheet bore groove depth and coaxiality measuring device according to a preferred embodiment of the present invention is shown.

[0037] Figure 5 A schematic front view of the tube hole structure of a tube sheet tube hole groove depth and coaxiality measuring device according to a preferred embodiment of the present invention is shown.

[0038] Figure 6 A side cross-sectional view of the tube hole structure of a tube sheet tube hole groove depth and coaxiality measuring device according to a preferred embodiment of the present invention is shown.

[0039] Figure 7 , Figure 8 A schematic flowchart of a method for measuring the depth and coaxiality of tube hole grooves in a tube sheet according to a preferred embodiment of the present invention is shown.

[0040] Explanation of icon numbers:

[0041] 1-Support;

[0042] 2-Five-axis measuring base;

[0043] 4-Spring;

[0044] 5-Probe thread adapter;

[0045] 6-Adjusting shims;

[0046] 7-Fixing ring;

[0047] 9-Pipe hole;

[0048] 11-Mandrel;

[0049] 12-On a flat surface;

[0050] 13-Upright board;

[0051] 31 - Main body of the percentage table;

[0052] 32-Probe;

[0053] 91 - Inner groove;

[0054] 111-Keyway;

[0055] 121 - Shaft hole;

[0056] 122 - Threaded hole. Detailed Implementation

[0057] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent.

[0058] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0059] The present invention provides a device for measuring the depth and coaxiality of the tube hole groove in a tube sheet, which is used to measure the depth of the groove in the tube hole of the main steam tube sheet of a high-temperature gas-cooled reactor and the concentricity between two grooves.

[0060] The main steam tube sheet structure of the steam generator in a high-temperature gas-cooled reactor is as follows: Figure 5 As shown, there are multiple tube holes 9 on the tube sheet, and each tube hole 9 has two annular grooves 91, as shown. Figure 6 As shown, during the manufacturing and quality inspection process, it is necessary to measure the dimensions and concentricity of the inner groove.

[0061] According to the present invention, a device for measuring the depth and coaxiality of tube hole grooves in a tube sheet is provided, such as... Figure 1 , Figure 2 As shown, it includes a support 1, a five-way measuring base 2, a dial indicator body 31, a measuring stylus 32, and a spring 4, wherein,

[0062] The support 1 includes a spindle 11, an upper plate 12, and a vertical plate 13, as follows: Figure 3 , Figure 4 As shown, the upper plate 12 is provided with a shaft hole 121, through which the upper plate 12 is sleeved onto the measuring rod of the dial indicator body 31.

[0063] The spring 4 and the five-way measuring base 2 are sequentially sleeved on the measuring rod of the dial indicator body 31 and are located below the upper plate 12.

[0064] The probe 32 is mounted on the side of the five-way measuring base 2, such that the probe 32 is perpendicular to the measuring rod of the dial indicator body 31.

[0065] The axis of the mandrel 11 is parallel to the axis of the upper plate 12. A keyway 111 is provided at the lower end of the mandrel 11 to accommodate the probe 32. Figure 1 As shown.

[0066] Preferably, the upright plate is perpendicular to the upper plate 12.

[0067] The five-axis probe 2 is a common structure used in coordinate measuring machines for mounting and positioning probes. It has mounting holes in multiple directions. In this invention, the five-axis probe only needs to have mounting holes in two directions, vertical and horizontal, and its specific structure is not limited.

[0068] The probe is a measuring probe for a dial indicator. The front end of the probe is a ball head, and the rear end is connected to the five-way measuring base 2 via a thread.

[0069] According to the present invention, after pressing the five-way probe 2 upward, the probe 32 retracts into the keyway 111 of the mandrel, allowing the mandrel to extend into the tube hole 9, as shown. Figure 7 As shown. Further, when the mandrel extends into the tube hole, the ball head of the probe 32, under the action of the spring 4, presses tightly against the tube hole to measure the inner diameter of the tube hole; changing the position of the mandrel allows the ball head of the probe 32 to enter the inner wall of the groove, as shown. Figure 8 As shown, the inner diameter of the groove is measured by a rotating measuring device, and the depth of the groove is determined based on the results of the two measurements.

[0070] Preferably, the mandrel 11 is cylindrical, and the diameter of the mandrel cross section corresponds to the diameter of the tube hole 9. More preferably, the diameter of the mandrel cross section and the diameter of the tube hole 9 are clearance-fitted, with a clearance of 0.02~0.03mm.

[0071] According to the present invention, the shaft hole 121 is perpendicular to the axis of the mandrel 11 and the two axes intersect.

[0072] In a preferred embodiment, a threaded hole 122 is provided on the side wall of the upper plate 12. The threaded hole 122 communicates with the shaft hole 121. The support 1 locks the dial indicator body 31 through the cooperation of the threaded hole 122 and the fastening bolt.

[0073] Obviously, the length direction of the keyway 111 is parallel to the axis of the mandrel. The width and depth of the keyway are slightly larger than the diameter of the probe head. The depth of the keyway is sufficient to allow the probe to be completely submerged in the mandrel when the five-way probe seat is pressed. The length of the keyway is slightly larger than the length of the probe.

[0074] In a preferred embodiment, the measuring device further includes a probe thread adapter 5 for extending the length of the probe and increasing the depth to which the probe penetrates the pipe hole. One end of the probe thread adapter is an external thread, and the other end is an internal thread.

[0075] Preferably, the thread is an M2 interface.

[0076] Preferably, the probe thread adapter is a cylinder with a major diameter of its external thread smaller than the outer diameter of the cylinder. The external thread of the probe thread adapter matches the threaded through hole at the center of the upper and lower planes of the five-way measuring base. The length of the external thread of the probe thread adapter is greater than the distance between the upper and lower planes of the five-way measuring base and slightly less than the sum of the distance between the upper and lower planes of the five-way measuring base and the length of the internal thread at the lower end of the dial indicator. This allows the probe to be securely fastened to the measuring rod of the dial indicator.

[0077] In a preferred embodiment, the difference between the radius of the probe's ball head and the radius of the probe's column is at least 0.4 mm greater than the maximum depth of the groove in the tube hole, to prevent the ball head from failing to contact the groove wall and to ensure that the probe can accurately measure the depth of the groove.

[0078] In a preferred embodiment, an adjusting shim 6 is provided between the upper plate 12 and the five-way measuring base 2. By selecting a reasonable adjusting shim thickness, the preload of the spring is adjusted so that when the measuring device is in a vertical free state, the spring is in contact with the lower surface of the five-way base without measuring force, and the axis of the probe extends beyond the outer wall of the support spindle. Figure 2 As shown,

[0079] In a preferred embodiment, a fixing ring 7 is provided between the upper plate 12 and the five-way measuring base 2. The adjusting shim 6 and the fixing ring 7 are located at both ends of the spring 4, respectively, to increase the contact area at the end of the spring, thereby improving the stability of the device.

[0080] This invention also discloses a method for measuring the depth and coaxiality of tube hole grooves in a tube sheet, which uses the aforementioned measuring device and includes the following steps:

[0081] Press the five-way probe upwards to fully insert the ball head of the probe into the keyway of the spindle;

[0082] Insert the mandrel into the tube bore, loosen the five-way probe base, and ensure the probe ball head fully contacts the tube bore wall. Figure 7 As shown;

[0083] Zero the dial indicator;

[0084] Slowly push the measuring device so that the probe ball head enters the inner groove area, as... Figure 8 As shown;

[0085] Rotate the measuring device one revolution and record the maximum value Xmax and minimum value Xmin of the dial gauge during the process. Based on the maximum and minimum values, obtain the depth of the inner groove and the coaxiality of the inner groove.

[0086] According to the present invention, the depth of the inner groove is expressed as:

[0087] D = [Xmin ~ Xmax];

[0088] Where D represents the depth of the groove, Xmin represents the minimum value of the dial gauge, and Xmax represents the maximum value of the dial gauge.

[0089] According to the present invention, the coaxiality of the inner groove is expressed as:

[0090] δ=Xmax - Xmin

[0091] Where δ represents the coaxiality δ of the inner groove.

[0092] Using the same method, the depth and coaxiality of another groove were measured.

[0093] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of this invention, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0094] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0095] The present invention has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present invention based on these embodiments, all of which fall within the scope of protection of the present invention.

Claims

1. A device for measuring the depth and coaxiality of tube hole grooves in a tube sheet, characterized in that, It includes a support (1), a five-axis measuring base (2), a dial indicator body (31), a measuring stylus (32), and a spring (4), among which, The support (1) includes a spindle (11), an upper plate (12), and a vertical plate (13). The upper plate (12) is provided with a shaft hole (121). The upper plate (12) is fitted onto the measuring rod of the dial indicator body (31) through the shaft hole (121). The spring (4) and the five-way measuring base (2) are sequentially sleeved on the measuring rod of the dial indicator body (31) and located below the upper plate (12). The probe (32) is mounted on the side of the five-way measuring base (2), such that the probe (32) is perpendicular to the measuring rod of the dial indicator body (31). The axis of the mandrel (11) is parallel to the axis of the upper plate (12), and a keyway (111) is provided at the lower end of the mandrel (11) to accommodate the probe (32).

2. The tube sheet bore groove depth and coaxiality measuring device according to claim 1, characterized in that, The mandrel (11) is cylindrical, and the diameter of the mandrel cross section corresponds to the diameter of the tube hole (9).

3. The tube sheet bore groove depth and coaxiality measuring device according to claim 1, characterized in that, The shaft hole (121) is perpendicular to the axis of the mandrel (11) and the two axes intersect.

4. The tube sheet bore groove depth and coaxiality measuring device according to claim 1, characterized in that, A threaded hole (122) is provided on the side wall of the upper plate (12). The threaded hole (122) is connected to the shaft hole (121). The support (1) locks the dial indicator body (31) through the cooperation of the threaded hole (122) and the bolt.

5. The tube sheet bore groove depth and coaxiality measuring device according to claim 1, characterized in that, The measuring device also includes a probe thread adapter (5) for extending the length of the probe.

6. The tube sheet bore groove depth and coaxiality measuring device according to claim 1, characterized in that, The difference between the radius of the probe's ball head and the radius of the probe's column is at least 0.4 mm greater than the maximum depth of the groove inside the tube hole.

7. The tube sheet bore groove depth and coaxiality measuring device according to claim 1, characterized in that, An adjusting shim (6) is provided between the upper plate (12) and the five-way measuring base (2). The preload of the spring is adjusted by selecting a reasonable adjusting shim thickness.

8. A method for measuring the depth and coaxiality of tube hole grooves in a tube sheet, using the measuring device described in any one of claims 1-7, characterized in that... Includes the following steps: Press the five-way probe upwards to fully insert the ball head of the probe into the keyway of the spindle; Insert the mandrel into the tube hole and loosen the five-way probe base so that the probe ball head can fully contact the tube hole wall; Zero the dial indicator; Slowly push the measuring device so that the probe ball head enters the inner groove area; Rotate the measuring device one revolution and record the maximum and minimum values ​​of the dial indicator during the process. Based on the maximum and minimum values, obtain the depth of the inner groove and the coaxiality of the inner groove.

9. The method for measuring the depth and coaxiality of the tube hole groove in a tube sheet according to claim 8, characterized in that, The depth of the groove is expressed as: D = [Xmin ~ Xmax]; Where D represents the depth of the groove, Xmin represents the minimum value of the dial gauge, and Xmax represents the maximum value of the dial gauge.

10. The method for measuring the depth and coaxiality of the tube hole groove in a tube sheet according to claim 9, characterized in that, The coaxiality of the inner groove is expressed as δ=Xmax - Xmin Where δ represents the coaxiality δ of the inner groove.

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