A device for measuring the distance across a sphere

Abstract

The present invention provides a device for measuring the cross-ball distance, comprising a measuring rod. One end of the measuring rod is connected with a dial indicator for zero adjustment, and the other end is connected with a measuring base. The measuring head of the dial indicator faces the measuring base. The measuring base is provided with a special-shaped hole, and a measuring ball is arranged in the special-shaped hole. The bottom of the measuring ball protrudes outward relative to the bottom surface of the measuring base. A notch is formed at the corner formed by the inner side surface and the bottom surface of the measuring base to expose the measuring ball. The device for measuring the cross-ball distance provided by the present invention can accurately and quickly measure the axial cross-ball distance from the conical surface step of the fuel channel end component to the end surface.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear industry equipment measurement, and particularly relates to a device for measuring the cross-ball distance. Background Art

[0002] The end components of the heavy water reactor fuel channel form the primary heat transfer system of the primary loop, and have the functions of positioning and supporting the fuel rod bundle and sealing the high-pressure and high-temperature heavy water coolant. As Figure 1 shown, during refueling, the charging and discharging machine relies on the clamping force generated by the nozzle assembly clamping mechanism to make the wedge-shaped claw 2 clamp on the conical surface step of the fuel channel, and the central support cylinder 3 is closely attached to the fuel channel end component 1. Sealing is achieved by relying on the sealing surface of the fuel channel end face, the static sealing ring, and the sealing surface of the central support cylinder. During overhaul, in order to ensure the smoothness of the sealing surface of the fuel channel end component 1, it is necessary to grind the defective sealing surface. After repeated grinding, the fuel channel end component 1 becomes shorter, which will affect the clamping performance of the nozzle assembly 4 and ultimately affect the sealing between the fuel channel end component 1 and the nozzle assembly 4. Therefore, it is necessary to measure the axial distance from the conical surface step of the fuel channel end component to the end face.

[0003] Currently, a depth vernier caliper is used to measure the change before and after grinding by means of the sealing plug step fixed inside the end component to confirm the grinding amount. Since it is obtained indirectly by calculation, this method has a large error, and additionally increases the workload of personnel for repeated confirmation and calculation, increasing the collective dose of the staff.

[0004] According to the design requirements, the measuring ball 5 can be placed at the conical surface step (as Figure 2 shown), and by measuring the axial cross-ball distance from the fuel channel end face to this position, it can be judged whether it meets the requirements for the clamping of the nozzle assembly. The measurement of the cross-ball distance is often used more in the detection of gear transmission system parts. Since a measuring rod is often used for substitution, it is also called the cross-rod distance.

[0005] According to the national standard for the inspection of cylindrical gears - Part 2: Inspection of radial deviation, radial runout, tooth thickness and backlash (GB / TZ18620.2 - 2008 / ISO / TR10064 - 2:1996) description, the cross-ball (rod) distance is to place two measuring balls (rods) in the tooth grooves that are as diametrically opposite as possible, and then measure the cross-ball (rod) dimension to control the tooth thickness. It can also be measured using a spherical probe internal micrometer to measure the minimum dimension between the two measuring balls (rods) placed in the tooth grooves at both ends of the diameter on the end plane.

[0006] According to the structure of the fuel channel and the high radiation environment on site, directly using a measuring ball or measuring rod to implement the measurement is not only difficult to ensure accuracy, but also will significantly increase the radiation dose of personnel. In view of these circumstances, it is urgent to develop a device for measuring the cross-ball distance, so that the axial cross-ball distance from the conical surface step to the end face of the fuel channel end component can be accurately and quickly measured in actual operations. Summary of the invention

[0007] The object of the present invention is to overcome the defects described in the prior art, thereby providing a device for measuring the cross-spherical distance, which can accurately and quickly measure the axial cross-spherical distance from the conical surface step to the end face of the fuel channel end component.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A device for measuring the cross-ball distance comprises a measuring rod, one end of which is connected to a zero-adjusted dial indicator, and the other end is connected to a measuring base, the measuring head of the dial indicator faces the measuring base, the measuring base is provided with a special-shaped hole, a measuring ball is arranged in the special-shaped hole, the bottom of the measuring ball protrudes outwardly relative to the bottom surface of the measuring base, and a notch is provided at a corner formed by the inner side surface of the measuring base and the bottom surface to expose the measuring ball.

[0010] As an implementable manner, an adjusting screw, a spring pressure cover, a spring and a ball holder are arranged in the special-shaped hole from top to bottom, and the ball holder presses the measuring ball downward.

[0011] As an practicable manner, a step is provided in the special-shaped hole to prevent the measuring ball from falling.

[0012] As an implementable manner, the measuring base is provided with two side-by-side and identical special-shaped holes.

[0013] As an practicable manner, the adjusting screw is threadably connected to the special-shaped hole.

[0014] As an implementable manner, the dial indicator is fixed by a clamping screw.

[0015] As an implementable manner, the depth of the notch is smaller than the distance from the axis of the special-shaped hole to the inner side surface.

[0016] As an implementable manner, a dimension calibration block is also included, and the dimension calibration block is used to zero the dial indicator.

[0017] As an implementable manner, the measuring rod is L-shaped.

[0018] As an implementable manner, a threaded hole and a positioning pin hole are provided on the mounting surface of the measuring base.

[0019] Compared with the prior art, a device for measuring the cross-ball distance provided by the present invention has the following beneficial effects:

[0020] A device for measuring the cross-ball distance provided by the present invention includes a measuring rod. One end of the measuring rod is connected with a zero-adjusted dial indicator, and the other end is connected with a measuring base. The dial indicator has been zero-adjusted, and the measuring head of the dial indicator faces the measuring base. The measuring base is provided with a special-shaped hole, and a measuring ball is arranged in the special-shaped hole. The bottom of the measuring ball protrudes outward relative to the bottom surface of the measuring base. A notch is formed at the corner formed by the inner side surface and the bottom surface of the measuring base to expose the measuring ball. Pull the dial indicator outward, move the measuring device for measuring the cross-ball distance to the conical surface step of the fuel channel end component to be measured, and make the measuring head of the dial indicator contact with the end face of the end component, then the reading of the dial indicator can be read, and further the axial cross-ball distance from the conical surface step to the end face of the fuel channel end component can be accurately and quickly measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of the nozzle clamping assembly of the charging and discharging machine clamping on the fuel channel end component in the prior art;

[0023] Figure 2 It is a schematic diagram of measuring the cross-ball distance from the conical surface to the end face of the fuel channel end component of the present invention;

[0024] Figure 3 It is a schematic principle diagram of measuring the cross-ball distance from the conical surface to the end face of the fuel channel end component of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the device for measuring the cross-ball distance provided by the embodiment of the present invention;

[0026] Figure 5 It is a sectional view of the measuring base provided by the embodiment of the present invention;

[0027] Figure 6 It is a top view of the dimension calibration block provided by the embodiment of the present invention;

[0028] Figure 7 It is a top view of the measuring base provided by the embodiment of the present invention;

[0029] Figure 8 is Figure 7 A sectional view along A-A;

[0030] Figure 9 is Figure 7 A view along direction B;

[0031] Figure 10 A schematic structural view of the measuring rod provided by the embodiment of the present invention;

[0032] Figure 11 is Figure 10 A view along direction A;

[0033] Figure 12 is Figure 10 A view along direction B;

[0034] Figure 13 A schematic structural view of the ball support provided by the embodiment of the present invention;

[0035] Figure 14 A schematic structural view of the spring gland provided by the embodiment of the present invention.

[0036] Explanation of reference numerals:

[0037] 1. Fuel channel end component; 2. Wedge-shaped claw; 3. Central support cylinder; 4. Nozzle assembly; 5. Measuring ball; 6. Dial indicator; 7. Compression screw; 8. Measuring rod; 9. Fastening bolt; 10. Measuring base; 11. Adjusting screw; 12. Spring gland; 13. Spring; 14. Ball support; 101. Special-shaped hole; 102. Bottom surface; 103. Inner side surface; 104. Installation surface; 1031. Notch; 1041. Threaded hole; 1042. Positioning pin hole; 15. Dimension calibration block. Detailed implementation manners

[0038] Although the device for measuring the ball-to-ball distance of the present invention can be implemented in many different ways, exemplary embodiments will be described in detail herein with reference to the accompanying drawings. It should be understood that the description herein should be considered as an illustration of the structure of the device for measuring the ball-to-ball distance, and is not intended to limit the protection scope of the present invention to the exemplary embodiments. Therefore, in essence, the description of the accompanying drawings and the detailed implementation manners should be considered for illustration rather than limitation of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "horizontal", etc. herein indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0040] The following will be further described in detail through specific embodiments.

[0041] As Figure 4 shown, the present invention provides a device for measuring the cross-ball distance, including a dial indicator 6, a measuring rod 8 and a measuring base 10. The measuring rod 8 is an L-shaped rod, one end of which is detachably connected to the dial indicator 6, and the other end of which is detachably connected to the measuring base 10. As Figure 5 , Figure 7 , Figure 8 and Figure 9 shown, the measuring base 10 is provided with a special-shaped hole 101, and a measuring ball 5 that can move upward by external force is arranged in the special-shaped hole 101. The measuring ball 5 is introduced into the special-shaped hole 101 from above the special-shaped hole 101, and the measuring ball 5 cannot pass through the bottom (lower part) of the special-shaped hole 101. The bottom of the measuring ball 5 protrudes outward (downward) relative to the bottom surface 102 of the measuring base 10. The inner side surface 103 of the measuring base 10 is perpendicular to the bottom surface 102, and a rectangular notch 1031 (for example, by milling process) is provided at the corner formed by the inner side surface 103 and the bottom surface 102 to expose the side and bottom of the measuring ball 5, so that the side of the measuring ball 5 can abut against the conical surface of the fuel channel end component (as Figure 2 and Figure 3 shown).

[0042] Preferably, as Figure 8 shown, the depth of the notch 1031 is less than the distance from the axis of the special-shaped hole 101 to the inner side surface 103, so that the measuring ball 5 will not slide out of the notch 1031 while exposing the side surface. The measuring ball 5 is a stainless steel ball with a diameter of 0.5 inches and a tolerance grade not lower than GR.40.

[0043] As Figure 4 , Figure 5 , Figure 13 and Figure 14 shown, the special-shaped hole 101 is successively provided with an adjusting screw 11, a spring gland 12, a spring 13 and a ball support 14 from top to bottom. The ball support 14 presses the measuring ball 5 downward through the elastic force of the spring 13. By screwing in or out the adjusting screw 11, the elastic force of the spring 13 is adjusted, and then the measuring ball 5 is pressed or loosened.

[0044] As Figure 8As shown in the figure, the measuring base 10 is provided with a special-shaped hole 101 in the vertical direction. The special-shaped hole 101 includes three sections of holes: an upper section, a middle section, and a lower section. The diameters of these three sections of holes decrease successively from top to bottom. That is to say, there are stepped portions between adjacent two sections of holes. Among them, the diameter of the lower section hole is smaller than the diameter of the measuring ball 5 to prevent the measuring ball 5 from falling from below (that is, the lowest step in the special-shaped hole 101 can block the falling of the measuring ball 5). The diameter of the middle section hole is equal to the diameter of the measuring ball 5, and the diameter of the upper section hole is larger than the diameter of the measuring ball 5. The part of the upper section hole close to the top of the measuring base 10 is provided with internal threads to be threadedly engaged with the external threads of the adjusting screw 11.

[0045] Preferably, the measuring base 10 is provided with 2 special-shaped holes 101. The 2 special-shaped holes 101 are arranged side by side and have the same size and shape, which is conducive to ensuring that the measuring rod 8 is parallel to the central axis of the conical surface during measurement, making the measurement more accurate.

[0046] As Figures 7 to 9 As shown in the figure, 4 threaded holes 1041 and 1 positioning pin hole 1042 are provided on the mounting surface 104 of the measuring base 10 for mounting the measuring rod 8. The 4 threaded holes 1041 are arranged in an array, and the positioning pin hole 1042 is arranged at the geometric center of the 4 threaded holes 1041. The positioning pin (not shown) is lubricated with an anti-seize agent (N-5000) and then installed into the positioning pin hole 1042 of the measuring base 10. Subsequently, the measuring rod 8 is installed on the mounting surface 104 of the measuring base 10 and fastened with the fastening bolt 9.

[0047] As Figures 10 to 12 As shown in the figure, one end of the measuring rod 8 connected to the dial indicator 6 is provided with a U-shaped hole. The dial indicator 6 is installed through the U-shaped hole and fixed by the compression screw 7.

[0048] As Figure 6 As shown in the figure, the size calibration block 15 is in a sheet-like structure or a plate structure, and its thickness is about the radius of the measuring ball 5 (about 0.25 inches). The size calibration block 15 is used to zero the dial indicator 6. The size calibration block 15 is machined from tool steel. The two front lugs are consistent with the measuring ball radius size and tolerance. The distance from the left end of the arc connection line of the two lugs of the size calibration block 15 (i.e., the rightmost end) to the left end is the same as the size of the fuel channel end component.

[0049] Before measurement, the size calibration block 15 is used for zeroing. The specific process is as follows: Loosen the adjusting screw 11 so that the measuring ball 5 moves upward to the middle section of the special-shaped hole 101 (the middle through-hole step). Use the size calibration block 15 to fit with the inner wall of the mounting hole of the measuring ball 5 on the measuring base 10, temporarily acting as the measuring ball for zeroing the dial indicator 6. Then remove the size calibration block 15 and properly tighten the adjusting screw 11 again to adjust the spring force to be moderate, and then the measurement can be started.

[0050] After zero adjustment is completed, pull the dial indicator 6 outwards, and move the device for measuring the ball-to-ball distance of the present invention to the position where measurement is required (such as the conical surface step of the fuel channel end component). Under the pressure of the spring, the two measuring balls 5 are simultaneously tangent to the two surfaces (the bottom surface and the conical surface) at the conical surface step, which can ensure that the measuring rod is parallel to the axis and the measurement is more accurate. Then, after releasing the hand, the measuring head of the dial indicator 6 contacts the end face of the end component, read the dial indicator reading, and compare it with the dimension of the dimension calibration block 15, and obtain the dimension of the ball-to-ball distance through simple addition and subtraction.

[0051] The calculation formula for the axial distance (X) from the step inflection point to the end face is: X = L - R * {1 + tan[(180 - β) / 2]}, where X is also the axial distance between A and B; L is the distance measured by the device for measuring the ball-to-ball distance; β is the conical surface angle; R is the radius of the measuring ball (as Figure 3 shown).

[0052] The above are only specific embodiments 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 those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A device for measuring the distance across a sphere, characterized in that, It includes a measuring rod (8), one end of the measuring rod (8) is connected with a zero-adjusting dial indicator (6), and the other end is connected with a measuring base (10). The measuring head of the dial indicator (6) faces the measuring base (10). The measuring base (10) is provided with 2 identical special-shaped holes (101) arranged side by side to ensure that the measuring rod (8) is parallel to the axis of the conical surface during measurement. The special-shaped hole (101) includes three sections of holes: an upper section, a middle section, and a lower section with diameters decreasing from top to bottom. There is a step between adjacent two sections of holes. A measuring ball (5) is arranged in the special-shaped hole (101). The bottom of the measuring ball (5) protrudes outward relative to the bottom surface (102) of the measuring base (10). A notch (1031) is formed at the corner where the inner side surface (103) of the measuring base (10) and the bottom surface (102) meet to expose the measuring ball (5). An adjusting screw (11), a spring gland (12), a spring (13), and a ball support (14) are sequentially arranged in the special-shaped hole (101) from top to bottom, and the ball support (14) presses the measuring ball (5) downward.

2. The device for measuring the cross-sphere distance according to claim 1, characterized in that, A step is arranged in the special-shaped hole (101) to prevent the measuring ball (5) from falling off.

3. The device for measuring the cross-sphere distance according to claim 1, characterized in that, The adjusting screw (11) is in threaded connection with the special-shaped hole (101).

4. A device for measuring the cross-sphere distance according to claim 1, characterized in that, The dial indicator (6) is fixed by a compression screw (7).

5. The device for measuring the cross-sphere distance according to claim 1, wherein The depth of the notch (1031) is less than the distance from the axis of the special-shaped hole (101) to the inner side surface (103).

6. The device for measuring the cross-sphere distance according to claim 1, characterized in that, It further includes a dimension calibration block (15), and the dimension calibration block (15) is used to zero-adjust the dial indicator (6).

7. The device for measuring the cross-sphere distance according to claim 1, characterized in that, The measuring rod (8) is L-shaped.

8. A device for measuring the distance across a sphere according to claim 1, characterized in that, Threaded holes (1041) and positioning pin holes (1042) are formed on the mounting surface (104) of the measuring base (10).

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