An integral grid cell stop and through gauge for a positioning grid

Abstract

The present invention specifically relates to an integral grid element go-no-go gauge for a positioning grid, which includes a positioning grid element go gauge and a positioning grid element no-go gauge. The positioning grid element go gauge is used to inspect the lower limit value of the inscribed circle diameter range of the positioning grid element, and the positioning grid element no-go gauge is used to inspect the upper limit value of the inscribed circle diameter range of the positioning grid element. The integral grid element go-no-go gauge for a positioning grid provided by the present invention can shorten the inspection efficiency of the inscribed circle diameter of the positioning grid element from about 2 hours to 5 minutes, greatly improving the inspection efficiency, and it is very easy to visually see how many grid element inscribed circle diameters on each grid exceed the tolerance.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear fuel assembly manufacturing, and particularly to an integral grid element go-no-go gauge for a positioning grid. Background Art

[0002] A certain number of fuel rods are arranged at a certain interval (such as 15×15 or 16×16, etc.) and fixed into a bundle, which is called a reactor fuel assembly. The reactor fuel assembly mainly consists of an upper nozzle, a lower nozzle, a positioning grid (also called a mixing grid or a holding grid), a control rod guide tube, and fuel rods.

[0003] Among them, the positioning grid is used to load and position the fuel rods and is composed of a plurality of inner strips and outer strips. The plurality of inner strips are orthogonal to each other to form a grid-like grid structure with a plurality of grid units, and the outer strips are fixedly surrounded outside the inner strips. Except for a few grid units used to set the control rod guide tubes, each of the remaining grid units contains a fuel rod.

[0004] The traditional positioning grid is square or rectangular. Alternatively, a hexagonal structure can be adopted. A positioning grid has a hexagonal structure and is composed of a shroud 1 and a plurality of positioning grid elements 2. The plurality of positioning grid elements 2 are formed into a grid-like grid structure with a plurality of grid units by resistance spot welding, and the shroud 1 is fixedly surrounded outside the positioning grid elements 2. After the positioning grid is spot welded, it is necessary to inspect the inscribed circle diameter of each positioning grid element 2. The inscribed circle of the positioning grid element consists of an inscribed circle formed by 3 protrusions inside the positioning grid element and must be controlled within a certain range.

[0005] The existing method is to inspect one by one with a single go-no-go gauge, and the inspection efficiency is very low. Moreover, due to the complex arrangement of the positioning grid elements, it is very easy to cause missed inspections. Summary of the Invention

[0006] Based on this, in view of the above problems, it is necessary to provide an integral grid element go-no-go gauge for a positioning grid to improve the detection efficiency.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] An integral grid element go-no-go gauge for a positioning grid includes a positioning grid element go gauge and a positioning grid element no-go gauge. The positioning grid element go gauge is used to inspect the lower limit value of the inscribed circle diameter range of the positioning grid element, and the positioning grid element no-go gauge is used to inspect the upper limit value of the inscribed circle diameter range of the positioning grid element.

[0009] Furthermore, the full-size gauge for the positioning grid element includes a first upper disc body, a first lower disc body, and full-size gauge steel balls equal in number to the positioning grid elements. The diameter of the full-size gauge steel balls is the lower limit value within the range of the inscribed circle diameter of the positioning grid element. Both the first upper disc body and the first lower disc body include a first grille plate, which has first grille units equal in number to the positioning grid elements. Each first grille unit is provided with a first grille counterbore, and a full-size gauge steel ball is slidably connected within each first grille counterbore. The first grille counterbores correspond one-to-one with the positioning grid elements.

[0010] Usage steps: Before use, due to the gravitational force of the full-size gauge steel balls themselves, place the full-size gauge steel balls into the first grille counterbores of the first lower disc body from the openings of the first grille counterbores of the first lower disc body, with one full-size gauge steel ball placed in each first grille counterbore of the first lower disc body. During use, the first lower disc body with the full-size gauge steel balls placed therein is at the bottom, the first upper disc body without the full-size gauge steel balls is at the top, and the positioning grid is clamped between the first upper disc body and the first lower disc body. The first grille counterbores of both the first upper disc body and the first lower disc body correspond one-to-one with the positioning grid elements, and both the first upper disc body and the first lower disc body are tightly attached to the positioning grid. Then, turn it over 180 degrees up and down. During the turning process, the positions of the first upper disc body, the first lower disc body, and the positioning grid do not change at all. Under the action of gravity, the full-size gauge steel balls slide out from the outlets of the first grille counterbores of the first upper disc body and enter the corresponding positioning grid elements; after passing through the positioning grid elements and entering the first grille counterbores of the first lower disc body, it indicates that the diameter of the inscribed circle of this positioning grid element is larger than the diameter of the full-size gauge steel ball, while if it does not pass through the positioning grid element, it indicates that the diameter of the inscribed circle of this positioning grid element is smaller than the diameter of the full-size gauge steel ball.

[0011] For the positioning grid elements that do not pass the full-size gauge steel balls, other tools can be used to enlarge the diameter of the inscribed circle of the positioning grid elements until all the full-size gauge steel balls can pass through the positioning grid elements, thereby determining that the diameter of the inscribed circle of each positioning grid element is larger than the diameter of the full-size gauge steel ball.

[0012] Furthermore, the full-size gauge for the positioning grid element further includes a first guide tube positioning post, which is screw-connected to the first lower disc body. During use, the first guide tube positioning post passes through the guide tube grid element of the positioning grid and is screw-connected to the first lower disc body to ensure that during the turning process, the position of the positioning grid and the first lower disc body does not change at all.

[0013] Furthermore, the full-size gauge for the positioning grid element further includes a first positioning pin, which is screw-connected to the first lower disc body. A first positioning hole matching the first positioning pin is provided at the corresponding position of the first upper disc body. During use, the first positioning pin passes through the first positioning hole of the first upper disc body and is screw-connected to the first lower disc body to ensure that during the turning process, the positions of the first upper disc body and the first lower disc body do not change at all.

[0014] Further, in the positioning grid element go - gauge, the size of the first grid plate matches that of the positioning grid.

[0015] Further, in the positioning grid element go - gauge, both the first upper disc body and the first lower disc body further include a first handle. The first handle is a ring uniformly distributed with a number of through - holes, and the ring is inscribed with the first grid plate.

[0016] Further, in the positioning grid element go - gauge, the first grid unit is diamond - shaped.

[0017] Further, in the positioning grid element go - gauge, the first grid plate is made of plexiglass or transparent plastic.

[0018] Further, the positioning grid element no - go - gauge includes a second upper disc body, a second lower disc body, and no - go - gauge steel balls equal in number to the positioning grid elements. The diameter of the no - go - gauge steel balls is the upper limit value within the range of the inscribed - circle diameter of the positioning grid elements. Both the second upper disc body and the second lower disc body include a second grid plate. The second grid plate has second grid units equal in number to the positioning grid elements. Each second grid unit is provided with a second grid counterbore. One no - go - gauge steel ball is slidably connected in each second grid counterbore of the second lower disc body, and the second grid counterbores correspond to the positioning grid elements one by one.

[0019] Usage steps: Before use, due to the gravity of the no - go - gauge steel balls themselves, place the no - go - gauge steel balls into the second grid counterbores of the second lower disc body from the openings of the second grid counterbores of the second lower disc body, with one no - go - gauge steel ball placed in each second grid counterbore of the second lower disc body. During use, the second lower disc body with the no - go - gauge steel balls placed in it is at the bottom, the second upper disc body without the no - go - gauge steel balls placed in it is at the top, and the positioning grid is clamped between the second upper disc body and the second lower disc body. The second grid counterbores of both the second upper disc body and the second lower disc body correspond to the positioning grid elements one by one, and both the second upper disc body and the second lower disc body are closely attached to the positioning grid. Then, turn it over 180 degrees up and down. During the turning process, the positions of the second upper disc body, the second lower disc body, and the positioning grid do not change at all. Under the action of gravity, the no - go - gauge steel balls slide out from the outlets of the second grid counterbores of the second upper disc body and enter the corresponding positioning grid elements; if they pass through the positioning grid elements and then enter the second grid counterbores of the second lower disc body, it indicates that the diameter of the inscribed circle of this positioning grid element is larger than the diameter of the no - go - gauge steel balls, and if they do not pass through the positioning grid elements, it indicates that the diameter of the inscribed circle of this positioning grid element is smaller than the diameter of the no - go - gauge steel balls.

[0020] For the positioning grid element of the no-go steel ball, other tools can be used to reduce its inscribed circle diameter until all the no-go steel balls cannot pass through the positioning grid element, so as to determine that the inscribed circle diameter of each positioning grid element is smaller than the diameter of the no-go steel ball.

[0021] Further, the no-go gauge for the positioning grid element further includes a second guide tube positioning post, which is screwed to the second lower disc body. During use, the second guide tube positioning post passes through the positioning grid guide tube element and is screwed to the second lower disc body to ensure that the positions of the positioning grid and the second lower disc body do not change during the flipping process.

[0022] Further, the no-go gauge for the positioning grid element further includes a second positioning pin, which is screwed to the second lower disc body. A second positioning hole matching the second positioning pin is provided at the corresponding position of the second upper disc body. During use, the second positioning pin passes through the second positioning hole of the second upper disc body and is screwed to the second lower disc body to ensure that the positions of the second upper disc body and the second lower disc body do not change during the flipping process.

[0023] Further, in the no-go gauge for the positioning grid element, the size of the second grid plate matches that of the positioning grid.

[0024] Further, in the no-go gauge for the positioning grid element, both the second upper disc body and the second lower disc body further include a second handle, which is a ring uniformly distributed with a plurality of through holes, and the ring is inscribed with the second grid plate.

[0025] Further, in the no-go gauge for the positioning grid element, the second grid unit is diamond-shaped.

[0026] Further, in the no-go gauge for the positioning grid element, the second grid plate is made of plexiglass or transparent plastic.

[0027] Further, the go steel ball and the no-go steel ball have different colors.

[0028] The beneficial technical effects of the present invention:

[0029] The integrated go-no-go gauge for the positioning grid provided by the present invention can shorten the inspection efficiency of the inscribed circle diameter of the positioning grid element from about 2 hours to 5 minutes, greatly improving the inspection efficiency, and it is very easy to visually see how many grid element inscribed circle diameters on each grid exceed the tolerance. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the positioning grid;

[0031] Figure 2 It is a schematic diagram of the inscribed circle diameter of the positioning grid element;

[0032] Figure 3 Schematic side view of the working state of the through gauge for the positioning grid element

[0033] Figure 4 Schematic side view of the working state of the non-through gauge for the positioning grid element

[0034] Figure 5 Schematic top view of the structure of the through gauge for the positioning grid element

[0035] Figure 6 Schematic top view of the structure of the non-through gauge for the positioning grid element

[0036] Among them, 1. Enclosure plate; 2. Positioning grid element; 3. First upper disk body; 4. First lower disk body; 5. Through gauge steel ball; 6. First grid plate; 7. First grid unit; 8. First grid counterbore; 9. First guide tube positioning column; 10. First positioning pin; 11. First handle; 12. Positioning grid; 13. Second upper disk body; 14. Second lower disk body; 15. Non-through gauge steel ball; 16. Second grid plate; 17. Second grid unit; 18. Second grid counterbore; 19. Second guide tube positioning column; 20. Second positioning pin; 21. Second handle. Specific implementation mode

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Embodiment 1

[0039] The integral non-through and through gauges for the positioning grid element of the present invention are applied to the inspection of the inscribed circle diameter of the positioning grid element 2 of the hexagonal positioning grid 12, and there are 312 positioning grid elements 2 in the hexagonal positioning grid 12.

[0040] An integral non-through and through gauge for a positioning grid element includes a through gauge for the positioning grid element and a non-through gauge for the positioning grid element. The through gauge for the positioning grid element is used to inspect the lower limit value of the inscribed circle diameter range of the positioning grid element 2, and the non-through gauge for the positioning grid element is used to inspect the upper limit value of the inscribed circle diameter range of the positioning grid element 2.

[0041] The through gauge for the positioning grid element includes a first upper disk body 3, a first lower disk body 4, and through gauge steel balls 5 equal in number to the positioning grid elements 2. The diameter of the through gauge steel balls 5 is the lower limit value of the inscribed circle diameter range of the positioning grid element 2. Both the first upper disk body 3 and the first lower disk body 4 include a first grid plate 6. The first grid plate 6 has first grid units 7 equal in number to the positioning grid elements 2. Each first grid unit 7 is provided with a first grid counterbore 8. A through gauge steel ball 5 is slidably connected in each first grid counterbore 8, and the first grid counterbores 8 correspond to the positioning grid elements 2 one by one.

[0042] The positioning grid element go - gauge further includes a first guide tube positioning post 9. The first guide tube positioning post 9 is connected to the first lower disc body 4 by screws. During use, the first guide tube positioning post 9 passes through the guide tube grid element of the positioning grid 12 and is connected to the first lower disc body 4 by screws, ensuring that the positions of the positioning grid 12 and the first lower disc body 4 do not change during the flipping process.

[0043] The positioning grid element go - gauge further includes a first positioning pin 10. The first positioning pin 10 is connected to the first lower disc body 4 by screws. A first positioning hole matching the first positioning pin 10 is provided at the corresponding position of the first upper disc body 3. During use, the first positioning pin 10 passes through the first positioning hole of the first upper disc body 3 and is connected to the first lower disc body 4 by screws, ensuring that the positions of the first upper disc body 3 and the first lower disc body 4 do not change during the flipping process.

[0044] In the positioning grid element go - gauge, the size of the first grid plate 6 matches that of the positioning grid 12.

[0045] In the positioning grid element go - gauge, both the first upper disc body 3 and the first lower disc body 4 further include a first handle 11. The first handle 11 is a ring uniformly distributed with a number of through - holes, and the ring is internally connected to the first grid plate 6.

[0046] In the positioning grid element go - gauge, the first grid unit 7 is diamond - shaped.

[0047] In the positioning grid element go - gauge, the first grid plate 6 is made of plexiglass or transparent plastic.

[0048] Steps for using the positioning grid element no - go and go - gauge:

[0049] Before use, due to the gravitational force of the go - gauge steel ball 5 itself, the go - gauge steel ball 5 is placed into the first grid sink hole 8 of the first lower disc body 4 from the opening of the first grid sink hole 8 of the first lower disc body 4. One go - gauge steel ball 5 is placed in each first grid sink hole 8 of the first lower disc body 4.

[0050] During use, the first lower disk body 4 with the go - gauge steel balls 5 placed therein is at the bottom, the first upper disk body 3 without the go - gauge steel balls 5 is on the top, the positioning grid frame 12 is clamped between the first upper disk body 3 and the first lower disk body 4. The first grid - type sunk holes 8 of the first upper disk body 3 and the first lower disk body 4 correspond one - to - one with the positioning grid frame grid elements 2. Both the first upper disk body 3 and the first lower disk body 4 are closely attached to the positioning grid frame 12. The first positioning pin 10 passes through the first positioning hole of the first upper disk body 3 and is screwed to the first lower disk body 4. The first guide - tube positioning post 9 passes through the guide - tube grid elements of the positioning grid frame 12 and is screwed to the first lower disk body 4. Then, it is flipped 180 degrees up and down. During the flipping process, the positions of the first upper disk body 3, the first lower disk body 4, and the positioning grid frame 12 do not change at all. Under the action of gravity, the go - gauge steel balls 5 slide out from the outlet of the first grid - type sunk holes 8 of the first upper disk body 3 and enter the corresponding positioning grid frame grid elements 2. After passing through the positioning grid frame grid elements 2, they enter the first grid - type sunk holes 8 of the first lower disk body 4, indicating that the inscribed - circle diameter of this positioning grid frame grid element 2 is larger than the diameter of the go - gauge steel ball 5. If they do not pass through the positioning grid frame grid element 2, it indicates that the inscribed - circle diameter of this positioning grid frame grid element 2 is smaller than the diameter of the go - gauge steel ball 5.

[0051] For the positioning grid frame grid elements 2 that the go - gauge steel balls 5 do not pass through, other tools can be used to enlarge the inscribed - circle diameter of the positioning grid frame grid elements 2 until all the go - gauge steel balls 5 can pass through the positioning grid frame grid elements 2, so as to determine that the inscribed - circle diameter of each positioning grid frame grid element 2 is larger than the diameter of the go - gauge steel ball 5.

[0052] The not - go gauge of the positioning grid frame grid elements includes a second upper disk body 13, a second lower disk body 14, and not - go gauge steel balls 15 with the same quantity as the positioning grid frame grid elements 2. The diameter of the not - go gauge steel balls 15 is the upper - limit value within the range of the inscribed - circle diameter of the positioning grid frame grid elements 2. Both the second upper disk body 13 and the second lower disk body 14 include second grid plates 16. The second grid plates 16 have second grid units 17 with the same quantity as the positioning grid frame grid elements 2. Each second grid unit 17 is provided with a second grid - type sunk hole 18. A not - go gauge steel ball 15 is slidably connected in each second grid - type sunk hole 18 of the second lower disk body 14. The second grid - type sunk holes 18 correspond one - to - one with the positioning grid frame grid elements 2.

[0053] The not - go gauge of the positioning grid frame grid elements further includes a second guide - tube positioning post 19. The second guide - tube positioning post 19 is screwed to the second lower disk body 14. During use, the second guide - tube positioning post 19 passes through the guide - tube grid elements of the positioning grid frame 12 and is screwed to the second lower disk body 14 to ensure that during the flipping process, the positions of the positioning grid frame 12 and the second lower disk body 14 do not change at all.

[0054] The stop gauge for the positioning grid element further includes a second positioning pin 20. The second positioning pin 20 is connected to the second lower disc body 14 by screws. A second positioning hole matching the second positioning pin 20 is provided at the corresponding position of the second upper disc body 13. During use, the second positioning pin 20 passes through the second positioning hole of the second upper disc body 13 and is connected to the second lower disc body 14 by screws, ensuring that the positions of the second upper disc body 13 and the second lower disc body 14 do not change at all during the flipping process.

[0055] In the stop gauge for the positioning grid element, the size of the second grid plate 16 matches that of the positioning grid 12.

[0056] In the stop gauge for the positioning grid element, both the second upper disc body 13 and the second lower disc body 14 further include a second handle 21. The second handle 21 is a ring uniformly distributed with a number of through holes, and the ring is internally connected to the second grid plate 16.

[0057] In the stop gauge for the positioning grid element, the second grid unit 17 is diamond-shaped.

[0058] In the stop gauge for the positioning grid element, the second grid plate 16 is made of plexiglass or transparent plastic.

[0059] The steps for using the stop gauge for the positioning grid element are as follows:

[0060] Before use, due to the gravity of the stop gauge steel ball 15 itself, the stop gauge steel ball 15 is placed into the second grid counterbore 18 of the second lower disc body 14 from the opening of the second grid counterbore 18 of the second lower disc body 14, and one stop gauge steel ball 15 is placed in each second grid counterbore 18 of the second lower disc body 14.

[0061] During use, the second lower disc body 14 with the go - no - go ball 15 placed on it is at the bottom, the second upper disc body 13 without the go - no - go ball 15 placed on it is at the top, the positioning grid 12 is clamped between the second upper disc body 13 and the second lower disc body 14. The second grid counterbores 18 of the second upper disc body 13 and the second lower disc body 14 correspond to the positioning grid grid elements 2 one by one. The second upper disc body 13 and the second lower disc body 14 are closely attached to the positioning grid 12. The second positioning pin 20 passes through the second positioning hole of the second upper disc body 13 and is screwed to the second lower disc body 14. The second guide tube positioning post 19 passes through the guide tube grid element of the positioning grid 12 and is screwed to the second lower disc body 14. Then, it is turned over 180 degrees up and down. During the turning process, the positions of the second upper disc body 13, the second lower disc body 14 and the positioning grid 12 do not change at all. Under the action of gravity, the go - no - go ball 15 slides out from the outlet of the second grid counterbore 18 of the second upper disc body 13 and enters the corresponding positioning grid grid element 2. After passing through the positioning grid grid element 2, it enters the second grid counterbore 18 of the second lower disc body 14, indicating that the diameter of the inscribed circle of this positioning grid grid element 2 is larger than the diameter of the go - no - go ball 15, while if it does not pass through the positioning grid grid element 2, it indicates that the diameter of the inscribed circle of this positioning grid grid element 2 is smaller than the diameter of the go - no - go ball 15.

[0062] For the positioning grid grid element 2 through which the go - no - go ball 15 passes, other tools can be used to reduce the diameter of the inscribed circle of the positioning grid grid element 2 until all the go - no - go balls 15 cannot pass through the positioning grid grid element 2, so as to determine that the diameter of the inscribed circle of each positioning grid grid element 2 is smaller than the diameter of the go - no - go ball 15.

[0063] The color of the master ball and the go - no - go ball is different.

[0064] Embodiment 2

[0065] Others are the same as Embodiment 1, the difference is that the positioning grid grid element go - no - go gauge of the present invention is applied to the inspection of the diameter of the inscribed circle of the positioning grid grid element of a square positioning grid.

[0066] Embodiment 3

[0067] Others are the same as Embodiment 1, the difference is that the positioning grid grid element go - no - go gauge of the present invention is applied to the inspection of the diameter of the inscribed circle of the positioning grid grid element of a rectangular positioning grid.

[0068] The integral grid element go - no - go gauge for the positioning grid provided by the present invention can shorten the inspection efficiency of the diameter of the inscribed circle of the positioning grid grid element from about 2 hours to 5 minutes, greatly improving the inspection efficiency, and it is very easy to visually see how many grid element inscribed circle diameters on each grid are out of tolerance.

[0069] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to the appended claims.

Claims

1. An integral grid element go-no-go gauge for a positioning grid, characterized in that, it includes a positioning grid element go-gauge and a positioning grid element no-go gauge. The positioning grid element go-gauge is used to inspect the lower limit value of the inscribed circle diameter range of the positioning grid element, and the positioning grid element no-go gauge is used to inspect the upper limit value of the inscribed circle diameter range of the positioning grid element; the positioning grid element go-gauge includes a first upper disk body, a first lower disk body and go-gauge steel balls equal in number to the positioning grid elements. The diameter of the go-gauge steel balls is the lower limit value of the inscribed circle diameter range of the positioning grid element. Both the first upper disk body and the first lower disk body include a first grid plate. The first grid plate has first grid units equal in number to the positioning grid elements. Each first grid unit is provided with a first grid counterbore. One go-gauge steel ball is slidably connected in each first grid counterbore, and the first grid counterbores correspond to the positioning grid elements one by one; the positioning grid element no-go gauge includes a second upper disk body, a second lower disk body and no-go gauge steel balls equal in number to the positioning grid elements. The diameter of the no-go gauge steel balls is the upper limit value of the inscribed circle diameter range of the positioning grid element. Both the second upper disk body and the second lower disk body include a second grid plate. The second grid plate has second grid units equal in number to the positioning grid elements. Each second grid unit is provided with a second grid counterbore. One no-go gauge steel ball is slidably connected in each second grid counterbore of the second lower disk body, and the second grid counterbores correspond to the positioning grid elements one by one.

2. The integral grid element go-no-go gauge for a positioning grid according to claim 1, characterized in that, the positioning grid element go-gauge further includes a first guide tube positioning post, and the first guide tube positioning post is connected to the first lower disk body by screws; the positioning grid element no-go gauge further includes a second guide tube positioning post, and the second guide tube positioning post is connected to the second lower disk body by screws.

3. The integral grid element go-no-go gauge for a positioning grid according to claim 1, characterized in that, the positioning grid element go-gauge further includes a first positioning pin, and the first positioning pin is connected to the first lower disk body by screws. A first positioning hole matching the first positioning pin is provided at the corresponding position of the first upper disk body; the positioning grid element no-go gauge further includes a second positioning pin, and the second positioning pin is connected to the second lower disk body by screws. A second positioning hole matching the second positioning pin is provided at the corresponding position of the second upper disk body.

4. The integral grid element go-no-go gauge for a positioning grid according to claim 1, characterized in that, in the positioning grid element go-gauge, the size of the first grid plate matches that of the positioning grid; in the positioning grid element no-go gauge, the size of the second grid plate matches that of the positioning grid.

5. The integral grid element go-no-go gauge for a positioning grid according to claim 1, characterized in that, In the locating grid element go - gauge, both the first upper disc body and the first lower disc body further include a first handle. The first handle is a ring uniformly distributed with a plurality of through - holes, and the ring is internally connected to a first grid plate. In the locating grid element not - go - gauge, both the second upper disc body and the second lower disc body further include a second handle. The second handle is a ring uniformly distributed with a plurality of through - holes, and the ring is internally connected to a second grid plate.

6. The integral locating grid element not - go / go - gauge according to claim 1, characterized in that, both the first grid unit and the second grid unit are rhombus - shaped.

7. The integral locating grid element not - go / go - gauge according to claim 1, characterized in that, both the first grid plate and the second grid plate are made of plexiglass or transparent plastic.

8. The integral locating grid element not - go / go - gauge according to any one of claims 1 - 7, characterized in that, the colors of the go - gauge steel ball and the not - go - gauge steel ball are different.

Images