Combined tool for repairing omega-shaped groove of tube socket of nuclear reactor control rod driving mechanism

Abstract

The utility model discloses a combined tool for repairing an omega-shaped groove of a tube socket of a control rod driving mechanism of a nuclear reactor. The combined tool comprises a first blade and a second blade, the first blade comprises a first notch, and the first notch comprises a chisel edge and two side edges; the chisel edge is used for machining the upper plane of the omega-shaped groove; the two side edges are connected to the two opposite sides of the chisel edge and used for removing burrs on the two sides of the omega-shaped groove; the second blade comprises a second notch; an outer circle tool nose used for machining the outer circle of the omega-shaped groove is formed at the end of the first side of the second notch. An inner side tool nose used for machining the inner side of the omega-shaped groove is formed at the end of the second side of the second notch. The device is used for machining and repairing the upper plane, the outer circle and the inner side of the omega-shaped groove of the CRDM pipe seat, is suitable for on-site repairing and machining of the omega-shaped groove of the CRDM pipe seat, and can work under the non-cooling condition.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant maintenance equipment technology, and in particular to a combination tool for repairing the bevel of the tube seat of a nuclear reactor control rod drive mechanism. Background Technology

[0002] Because the CRDM (Control Rod Drive Mechanism) sockets of in-service nuclear power plant units cannot be removed from a specific area, and the sockets themselves are large and densely distributed, conventional equipment and process routes cannot meet the maintenance requirements or enter the area when repairing the Ω-groove of the CRDM sockets.

[0003] Therefore, it is necessary to design a set of special tools to meet the requirements of machining and repairing the Ω bevel of CRDM pipe fittings on-site at nuclear power plants. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a combination tool for repairing the bevel of the tube seat of a nuclear reactor control rod drive mechanism.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to provide a combination tool for repairing the Ω bevel of the CRDM control rod drive mechanism tube seat, including a first blade and a second blade symmetrically arranged on the Ω bevel of the CRDM tube seat;

[0006] The first blade includes a first notch facing the Ω bevel, the first notch including a transverse cutting edge for machining the upper surface of the Ω bevel, and two side cutting edges connected to opposite sides of the transverse cutting edge for removing burrs from both sides of the Ω bevel;

[0007] The second cutting tool includes a second groove facing the Ω bevel; a first side of the second groove corresponds to the outer circle side of the Ω bevel, and the end of the first side forms an outer circle cutting tip for machining the outer circle of the Ω bevel; a second side of the second groove corresponds to the inner side of the Ω bevel, and the end of the second side forms an inner side cutting tip for machining the inner side of the Ω bevel.

[0008] In some embodiments, in the feed direction of the second blade, the length of the first side of the second groove is greater than the length of the second side.

[0009] In some embodiments, the first blade includes a first mounting portion and a first processing portion that are in contact with each other, the first groove is disposed on the side of the first processing portion facing away from the first mounting portion, and the width of the first groove is set to correspond to the thickness of the Ω bevel.

[0010] In some embodiments, the first processing portion includes a first surface and a second surface opposite to each other, the second surface having a recessed chip-breaking groove extending along the width of the second surface, and the first groove opening being disposed at one end of the chip-breaking groove away from the first mounting portion.

[0011] In some embodiments, the bottom surface of the chip breaker groove includes an arcuate surface recessed inward from the second surface and a plane connected to the arcuate surface, the plane extending obliquely and penetrating the side of the first processing portion facing away from the first mounting portion.

[0012] In some embodiments, the first mounting portion is triangular in shape and has a first mounting hole.

[0013] In some embodiments, the second blade includes a second mounting portion and a second processing portion that are in contact with each other, and the second slot is disposed on the side of the second processing portion opposite to the second mounting portion.

[0014] In some embodiments, the first side of the second groove is a straight-edged blade, and the straight-edged blade has an angle with the vertical axis; the second side of the second groove is an arc-shaped blade that mates with the inner side of the Ω-shaped bevel.

[0015] The first side and the second side are respectively connected to the bottom side of the second groove by rounded corners.

[0016] In some embodiments, an upper limit point is provided on the second side near the bottom side, and the horizontal distance between the upper limit point and the outer circular cutting tip corresponds to the thickness of the Ω bevel.

[0017] In some embodiments, the second mounting portion is triangular in shape and has a second mounting hole.

[0018] The beneficial effects of this invention are as follows: By using a combination of the first and second blades, symmetrically arranged above the Ω-groove of the CRDM pipe seat, it is used to process and repair the upper surface, outer circle, and inner side (R groove) of the Ω-groove of the CRDM pipe seat. Burrs can be removed simultaneously during the processing of the upper surface. This invention has the advantages of simple structure, accurate forming dimensions, high interchangeability, and convenient installation. It is suitable for on-site repair processing of the Ω-groove of CRDM pipe seats and can operate under conditions without cooling. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the combined cutting tool on the Ω bevel of a CRDM tube seat according to an embodiment of the present invention;

[0021] Figure 2 This is a front view of the first blade in a combined cutting tool according to an embodiment of the present invention;

[0022] Figure 3 This is a side view of the first blade in a combined cutting tool according to an embodiment of the present invention;

[0023] Figure 4 This is a front view of the second blade in a combined cutting tool according to an embodiment of the present invention. Detailed Implementation

[0024] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] like Figure 1 As shown, a combination tool for repairing the Ω bevel of the CRDM (Control Rod Drive Mechanism) tube seat of a nuclear reactor according to an embodiment of the present invention includes a first blade 10 and a second blade 20 for machining the Ω bevel 110 of the CRDM tube seat 100 of a nuclear reactor.

[0026] The first blade 10 and the second blade 20 are symmetrically arranged on the Ω bevel 110 of the CRDM tube seat 100, and are used in conjunction with a tool drive device to drive the first blade 10 and the second blade 20 to feed and rotate around the circumference of the Ω bevel 110.

[0027] The first cutting blade 10 is used to machine the upper surface 111 of the Ω-bevel 110 and simultaneously remove burrs. (Reference) Figure 1 and Figure 2 The first cutting blade 10 includes a first groove 101, which engages with the Ω-bevel 110 to process the Ω-bevel 110. Taking the first cutting blade 10 above the Ω-bevel 110 as an example, the first groove 101 faces the Ω-bevel 110. The first groove 101 includes a transverse cutting edge 102 and two side cutting edges 103 connected to opposite sides of the transverse cutting edge 102. In the structure of the first groove 101, the transverse cutting edge 102 is the bottom surface of the first groove 101, and the two side cutting edges 103 are opposite sides of the first groove 101.

[0028] Above the Ω bevel 110, the transverse cutting edge 102 is directly opposite the upper plane 111 of the Ω bevel 110. The transverse cutting edge 102 is used to cut the upper plane 111. The two side cutting edges 103 on opposite sides of the transverse cutting edge 102 are used to remove burrs from both sides of the Ω bevel 110 (specifically, both sides of the upper plane 111).

[0029] The width of the first groove 101 (equal to the length of the transverse blade 102) is set to correspond to the thickness of the Ω bevel 110 so that the first groove 101 can fit into the upper end of the Ω bevel 110. While the transverse blade 102 processes the upper plane 111, the two side blades 103 effectively remove burrs, avoiding the distance between the two side blades 103 being too large to fully remove burrs.

[0030] Combination Figures 1 to 3 In one embodiment, the first blade 10 may include a first mounting portion 11 and a first machining portion 12 that are connected to each other. The first mounting portion 11 is used to cooperate with a tool drive device to mount the first blade 10 on the tool drive device. The first machining portion 12 serves as the machining body of the first blade 10, and a first groove 101 is provided on the first machining portion 12.

[0031] exist Figure 2 In the illustrated embodiment, the first mounting portion 11 is triangular in shape, and its one surface and two side surfaces mate with the cutting head mounting position on the cutting tool drive device. The first mounting portion 11 is provided with a first mounting hole 13, which is used to mate with a mounting shaft and fix it at the cutting head mounting position.

[0032] The first blade 10 may be an integral structure. The first mounting part 11 includes opposing first and second surfaces, and the first processing part 12 includes opposing first and second surfaces. The first surface of the first processing part 12 is flush with the first surface of the first mounting part 11, and the second surface of the first processing part 12 is flush with the second surface of the first mounting part 11, so that the first blade 10 has a uniform thickness in the length direction.

[0033] On the first machining section 12, a first groove 101 is provided on the side of the first machining section 12 facing away from the first mounting section 11. The depth of the first groove 101 does not need to be too large, just enough to allow the cross-blade 102 to cut the upper plane 111 and the side blade 103 to remove burrs on both sides of the upper plane 111, without interfering with the outer circle side and the inner R groove 120 of the Ω bevel 110.

[0034] The second surface of the first machining section 12 is provided with a recessed chip breaker groove 14. The chip breaker groove 14 extends along the width of the second surface and can penetrate through two opposite sides of the first machining section 12. A first slot 101 is provided in the chip breaker groove 14 and is located at the end of the chip breaker groove 14 away from the first mounting section 11. The chip breaker groove 14 is used to break the chips along the chip breaker groove 14 and discharge them outward when the chisel edge 102 cuts the upper plane 111 of the Ω bevel 110 to generate chips.

[0035] like Figure 3As shown, the bottom surface of the chip breaker groove 14 includes an arcuate surface 141 recessed inward from the second surface of the first machining part 12 and a plane 142 connected to the arcuate surface 141. The plane 142 extends obliquely and penetrates the side of the first machining part 12 facing away from the first mounting part 11. When the chisel 102 cuts the upper plane 111 of the Ω bevel 110 to generate chips, the chips travel along the plane 142 to the arcuate surface 141. At the arcuate surface 141, the chips can bend outward from the arcuate surface 141 and break off from the upper plane 111 and the first groove 101.

[0036] Preferably, the first groove 101 is eccentrically disposed on the first processing section 12, that is, not located at the center of the first processing section 12. The horizontal distance between the first groove 101 and the adjacent side of the first processing section 12 is less than the width of the R groove 120 inside the Ω bevel 110.

[0037] The second cutting tool 20 is used to cut the outer circle side and the inner R groove 120 of the Ω bevel 110 to achieve the required outer circle size and inner R groove size.

[0038] Combination Figure 1 and Figure 4 The second blade 20 includes a second groove 201, which engages with the Ω bevel 110 to process the Ω bevel 110. Taking the second blade 20 above the Ω bevel 110 as an example, the second groove 201 faces the Ω bevel 110.

[0039] The second groove 201 has a first side 202 and a second side 203, both of which have cutting edges. The first side 202 of the second groove 201 corresponds to the outer circle of the Ω bevel 110, and the end of the first side 202 forms an outer circle cutting tip 204 for cutting the outer circle of the Ω bevel 110. The second side 203 of the second groove 201 corresponds to the inner side of the Ω bevel 110 (within the R groove 120), and the end of the second side 203 forms an inner cutting tip 205 for cutting the inner side of the Ω bevel 110.

[0040] In the feed direction of the second insert 20, the length of the first side 202 of the second groove 201 is greater than the length of the second side 203, such that the outer circular cutting tip 204 at the end of the first side 202 is outside the inner cutting tip 205 at the end of the second side 203. During operation, the second insert 20 first contacts the Ω-groove 110 through the outer circular cutting tip 204 and processes the outer side of the Ω-groove 110 to form the outer circular side, and then the inner cutting tip 205 contacts the inner side of the Ω-groove 110 to process the allowance of the inner R-groove 120. The second side 203 is provided with an upper limit point 200, and the feed stops when the upper limit point 200 descends to the upper plane 111 of the Ω-groove 110.

[0041] In this design, the first side 202 of the second notch 201 is a straight-edged cutting edge, which is inclined relative to the vertical axis (or the axis parallel to the center line of the second insert 20), such that there is an angle α between the straight-edged cutting edge and the vertical axis. This angle α satisfies the requirement that the feed of the second insert 20 drives the outer diameter cutting tip 204 to contact the outer side of the Ω-groove 110 and effectively cut the outer side, forming an outer diameter side with a set radius. Alternatively, the angle α between the straight-edged cutting edge and the vertical axis (or the axis parallel to the center line of the second insert 20) can be 5°.

[0042] The second side 203 of the second groove 201 is an arc-shaped cutting edge that mates with the inner side of the Ω bevel 110. The inner cutting tip 205 cuts the inner side of the Ω bevel 110. As the second insert 20 is fed, the inner cutting tip 205 moves into the R groove 120, and the arc-shaped cutting edge moves accordingly and mates with the inner side of the Ω bevel 110.

[0043] The second groove 201 also has a bottom side 206, which connects the first side 202 and the second side 203. The first side 202 and the second side 203 are respectively connected to the bottom side 206 by rounded corners. The upper limit point 200 is set at the position of the second side 203 near the bottom side 206; when the upper limit point 200 descends to the upper plane 111 of the Ω bevel 110, there is a gap between the bottom side 206 and the upper plane 111.

[0044] The horizontal distance d between the upper limit point 200 and the outer circle tool tip 204 corresponds to the thickness setting of the Ω bevel 110.

[0045] Combination Figure 1 and Figure 4 In one embodiment, the second blade 20 may include a second mounting portion 21 and a second machining portion 22 connected to each other. The second mounting portion 21 is used to cooperate with the tool drive device to mount the second blade 20 on the tool drive device. The second machining portion 22 serves as the machining body of the second blade 20, and a second groove 201 is provided on the second machining portion 22.

[0046] In some embodiments, the second mounting portion 21 is triangular in shape, and the second mounting portion 21 engages with the tool head mounting position on the tool drive device with one surface and two side surfaces. The second mounting portion 21 is provided with a second mounting hole 23, which is used to engage with a mounting shaft and fix it at the tool head mounting position.

[0047] The second blade 20 may be an integral structure. The second mounting part 21 includes opposing first and second surfaces, and the second processing part 22 includes opposing first and second surfaces. The first surface of the second processing part 22 is flush with the first surface of the second mounting part 21, and the second surface of the second processing part 22 is flush with the second surface of the second mounting part 21, so that the second blade 20 has a uniform thickness in the length direction.

[0048] On the second processing section 22, the second slot 201 is provided on the side of the second processing section 22 facing away from the second mounting section 21.

[0049] Preferably, the second groove 201 is eccentrically positioned on the second machining section 22, i.e., not located at the center of the second machining section 22. The inner cutting tip 205 is smoothly connected between the second side 203 and one side of the second machining section 22. The outer cutting tip 204 has a certain horizontal distance from the opposite side of the second machining section 22, and the end of the outer cutting tip 204 away from the first side 202 is connected to the aforementioned opposite side through the side of the second machining section 22 facing away from the second mounting part 21.

[0050] When in use, the combined cutting tool of this utility model is mounted on the cutting head of the cutting tool drive device. The first cutting blade 10 and the second cutting blade 20 are symmetrically distributed on opposite sides of the CRDM tube seat 100 and are positioned above the Ω bevel 110. The cutting tool drive device drives the combined cutting tool to feed (feed direction as follows) Figure 1 (As indicated by the arrow) and rotation. The combined tool is based on the turning principle. During operation, the second insert 20 first contacts the Ω bevel 110 through the outer cutting tip 204 and machines the outer side of the Ω bevel 110 to form the outer circular side. Then, the inner cutting tip 205 contacts the inner side of the Ω bevel 110 to machine the remaining material of the inner R groove 120. The second side 203 has an upper limit point 200. When the upper limit point 200 drops to the upper plane 111 of the Ω bevel 110, the feed stops. The first insert 10 cuts the upper plane 111 of the Ω bevel 110 through the chisel edge 102. The two side edges 103 on opposite sides of the chisel edge 102 simultaneously remove burrs from both sides of the Ω bevel 110 (specifically, both sides of the upper plane 111).

[0051] By arranging the tool drive device, the first insert 10 can be machined slightly after the outer circle of the Ω bevel 110 is machined, and then the first insert 10 and the inner tool tip 205 can simultaneously cut the upper plane 111 of the Ω bevel 110 and the R groove 120 inside the Ω bevel 110.

[0052] This invention can be applied to on-site repair equipment or tools for different types of reactor tube seat Ω-shaped bevels. By combining two types of forming blades, it enables the processing and repair of bevels for thin-walled tubular structures and complex shapes. No cooling is required during use.

[0053] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A combination tool for repairing the bevel of a control rod drive mechanism tube seat in a nuclear reactor, characterized in that, Includes a first blade and a second blade symmetrically arranged on the Ω bevel of the CRDM pipe seat; The first blade includes a first notch facing the Ω bevel, the first notch including a transverse cutting edge for machining the upper surface of the Ω bevel, and two side cutting edges connected to opposite sides of the transverse cutting edge for removing burrs from both sides of the Ω bevel; The second cutting tool includes a second groove facing the Ω bevel; a first side of the second groove corresponds to the outer circle side of the Ω bevel, and the end of the first side forms an outer circle cutting tip for machining the outer circle of the Ω bevel; a second side of the second groove corresponds to the inner side of the Ω bevel, and the end of the second side forms an inner side cutting tip for machining the inner side of the Ω bevel.

2. The nuclear reactor control rod drive mechanism tube seat Ω bevel repair combination tool according to claim 1, characterized in that, In the feed direction of the second blade, the length of the first side of the second groove is greater than the length of the second side.

3. The nuclear reactor control rod drive mechanism tube seat Ω-groove repair combination tool according to claim 1 or 2, characterized in that, The first blade includes a first mounting portion and a first processing portion that are in contact with each other. The first groove is disposed on the side of the first processing portion facing away from the first mounting portion, and the width of the first groove is set to correspond to the thickness of the Ω bevel.

4. The nuclear reactor control rod drive mechanism tube seat Ω bevel repair combination tool according to claim 3, characterized in that, The first processing part includes a first surface and a second surface opposite to each other. The second surface is provided with a concave chip breaking groove that extends along the width of the second surface. The first groove opening is located at one end of the chip breaking groove away from the first mounting part.

5. The nuclear reactor control rod drive mechanism tube seat Ω bevel repair combination tool according to claim 4, characterized in that, The bottom surface of the chip breaking groove includes an arc-shaped surface recessed inward from the second surface and a plane connected to the arc-shaped surface. The plane extends obliquely and penetrates the side of the first processing part away from the first mounting part.

6. The nuclear reactor control rod drive mechanism tube seat Ω-groove repair combination tool according to claim 3, characterized in that, The first mounting part is triangular in shape and has a first mounting hole.

7. The nuclear reactor control rod drive mechanism tube seat Ω-groove repair combination tool according to claim 1 or 2, characterized in that, The second blade includes a second mounting portion and a second processing portion that are in contact with each other, and the second groove is disposed on the side of the second processing portion facing away from the second mounting portion.

8. The nuclear reactor control rod drive mechanism tube seat Ω-groove repair combination tool according to claim 7, characterized in that, The first side of the second groove is a straight-edged blade, and the straight-edged blade has an angle with the vertical axis; the second side of the second groove is an arc-shaped blade that mates with the inner side of the Ω-shaped bevel. The first side and the second side are respectively connected to the bottom side of the second groove by rounded corners.

9. The nuclear reactor control rod drive mechanism tube seat Ω-groove repair combination tool according to claim 8, characterized in that, An upper limit point is provided on the second side near the bottom side, and the horizontal distance between the upper limit point and the outer circular cutting tip corresponds to the thickness of the Ω bevel.

10. The nuclear reactor control rod drive mechanism tube seat Ω-groove repair combination tool according to claim 7, characterized in that, The second mounting part is triangular in shape and has a second mounting hole.

Images