A tool replacement and alignment method

Abstract

The invention belongs to the technical field of tool replacement in a nuclear power unit, and discloses a tool replacement and centering method. The tool replacement includes a lifting tool, a guide bolt, a lifting sleeve and a guide seat. One end of the lifting tool is connected to a hoisting device; the guide bolt includes a guide connecting section and a guide extension section that are fixedly connected to each other, and the guide connecting section is detachably connected to the lifting tool; the lifting sleeve is movably sleeved outside the lifting tool and the guide bolt, and the guide extension section extends out of the lifting sleeve; the guide seat is connected to the in-pile instrument grid assembly, and a centering groove is provided. The guide extension section can extend into the centering groove, and the lifting sleeve can be clamped on the guide seat. The tool replacement can solve technical problems such as the difficulty of centering the lifting sleeve and the guide seat of the in-pile instrument grid assembly and the long operation time.

Description

Technical Field

[0001] The invention relates to the technical field of tool replacement in a nuclear power unit, and in particular to a tool replacement and centering method. Background Art

[0002] AP1000 (Advanced Passive PWR, 1000 means the power level is one million kilowatts) is an advanced passive pressurized water reactor nuclear power technology. A nuclear power unit is a basic power generation unit consisting of a reactor and its supporting steam turbine generator unit, as well as the systems and facilities required to maintain their normal operation and ensure safety. The nuclear fuel made of uranium undergoes fission in the equipment inside the nuclear power unit to generate a large amount of heat energy, which is then taken out by water under high pressure to generate steam in the steam generator. The steam drives the steam turbine to rotate with the generator, and electricity is generated continuously.

[0003] The connection of the lifting tool for the in-pile instrument grid assembly of a conventional nuclear power plant is to first align the lifting sleeve and the guide seat, then connect the guide bolt and the guide seat, and finally connect the lifting sleeve and the in-pile instrument grid assembly. However, when centering the lifting sleeve and the guide seat, the centering position is about 7 meters underwater, and there is a problem of insufficient guidance. A deviation of 6.5mm will make it impossible to achieve centering, so the centering is very difficult. In addition, the lifting sleeve is too long and lacks rigidity, making it difficult to adjust the centering. During on-site operation, the centering process of the lifting sleeve and the guide seat takes a long time, and the radiation dose to the personnel is high.

[0004] Therefore, a tool replacement and alignment method is urgently needed to solve the above problems. Summary of the invention

[0005] According to one aspect of the present invention, a replacement tool is provided, which can solve technical problems such as difficulty in centering a lifting sleeve and a guide seat of an in-pile instrument grid assembly and long operation time.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A replacement tool comprises a lifting tool, a guide bolt, a lifting sleeve and a guide seat, wherein one end of the lifting tool is connected to a lifting device; the guide bolt comprises a guide connecting section and a guide extension section which are fixedly connected to each other, and the guide connecting section is detachably connected to the lifting tool; the lifting sleeve is movably sleeved on the outside of the lifting tool and the guide bolt, and the guide extension section extends out of the lifting sleeve; the guide seat is connected to an in-pile instrument grid assembly, and a centering groove is provided, the guide extension section can extend into the centering groove, and the lifting sleeve can be clamped on the guide seat.

[0008] Optionally, the lifting tool includes a fixed lifting section and a lifting connection section, the lifting section is provided with a lifting ear, the lifting ear is connected to the lifting equipment, and the lifting connection section is connected to the guide bolt.

[0009] Optionally, the hoisting section is provided with a support plate, the support plate is mounted on the side of the lifting ear away from the hoisting device, and is clamped on the lifting sleeve.

[0010] Optionally, the guide extension section is provided with an external thread, and the centering groove is provided with an internal thread, and the external thread and the internal thread can be screwed together.

[0011] Optionally, the bottom surface of the centering groove is a conical surface, and the tip of the conical surface is away from the notch of the centering groove.

[0012] Optionally, a connecting device is further included, and the guide connecting section is detachably connected to the lifting tool through the connecting device.

[0013] According to another aspect of the present invention, a centering method is provided, using the replacement tool described in any one of the above solutions, and the centering step includes:

[0014] The guide extension section extends into the centering groove;

[0015] The lifting sleeve moves in a direction toward the guide seat and is clamped on the outside of the guide seat.

[0016] Optionally, a rough centering process is performed before the guide extension section extends into the centering groove, and the lifting equipment drives the guide bolt and the lifting sleeve to move so that the guide bolt faces the centering groove.

[0017] Optionally, the connection position between the guide extension section and the guide connection section is a shoulder structure, and when the lifting sleeve is clamped on the outside of the guide seat, the guide seat abuts against the shoulder structure.

[0018] Optionally, after the lifting sleeve is clamped on the outside of the guide seat, the connecting device is actuated to disconnect the lifting tool and the guide bolt.

[0019] Beneficial effects of the present invention:

[0020] The replacement tool provided by the present invention includes a lifting tool, a guide bolt, a lifting sleeve and a guide seat, one end of the lifting tool is connected to the lifting equipment; the guide bolt includes a guide connecting section and a guide extension section that are fixedly connected to each other, and the guide connecting section is detachably connected to the lifting tool; the lifting sleeve is movably sleeved on the outside of the lifting tool and the guide bolt, and the guide extension section extends out of the lifting sleeve; the guide seat is connected to the in-pile instrument grid assembly, and a centering groove is provided, the guide bolt can be extended into the centering groove, and the lifting sleeve can be clamped on the guide seat. There is no need to align the lifting sleeve with the guide seat, the guide extension section is extended into the centering groove, connected to the guide seat, and then the lifting sleeve is lowered, and can be accurately clamped on the guide seat, which not only realizes the connection between the guide bolt and the guide seat, but also saves the centering process of the lifting sleeve and the guide seat. The replacement tool can solve the technical problems such as the difficulty of centering the lifting sleeve with the guide seat of the in-pile instrument grid assembly and the long operation time.

[0021] The centering method provided by the present invention adopts the replacement tool, thereby eliminating the centering process of the lifting sleeve and the guide seat, avoiding the technical problem that the lifting sleeve and the guide seat are difficult to center, accelerating the centering installation speed, and reducing the radiation dose received by personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the replacement tool provided by an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the second step of the centering method provided by an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the third step of the centering method provided in an embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the fourth step of the centering method provided in an embodiment of the present invention.

[0026] In the figure:

[0027] 100, lifting tool; 110, lifting section; 120, lifting connection section;

[0028] 200, guide bolt; 210, guide connecting section; 220, guide extension section;

[0029] 300, lifting sleeve;

[0030] 400, guide seat; 410, centering groove;

[0031] 500. Connecting device. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] Figure 1 The schematic diagram of the replacement tool structure provided by the embodiment of the present invention is shown. The replacement tool provided by the embodiment of the present invention includes a lifting tool 100, a guide bolt 200, a lifting sleeve 300 and a guide seat 400. The lifting tool 100 is connected to the lifting equipment. The guide bolt 200 is connected to the lifting tool 100. The lifting sleeve 300 is movably sleeved on the outside of the lifting tool 100 and the guide bolt 200. The guide seat 400 is connected to the in-pile instrument grid assembly, the guide bolt 200 can be connected to the guide seat 400, and the lifting sleeve 300 can be clamped on the guide seat 400.

[0037] Specifically, one end of the lifting tool 100 is connected to a lifting device, and the lifting tool can lift the lifting tool 100 to a target location.

[0038] More specifically, the lifting tool 100 includes a lifting section 110 and a lifting connection section 120 that are fixedly connected to each other. The lifting section 110 is provided with a lifting ear that can be connected to a lifting device. The lifting connection section 120 is connected to a guide bolt 200 .

[0039] More specifically, the hoisting section 110 is provided with a support plate, which is installed on the side of the lifting ear away from the hoisting device and is clamped on the lifting sleeve 300, and the lifting sleeve 300 can move along the axial direction of the lifting tool 100. When the support plate is clamped on the lifting sleeve 300, the lifting tool 100 and the lifting sleeve 300 can be transported to the target position at the same time by the lifting device. After both are transported to the target position, the lifting sleeve 300 is pushed downward, and the clamping of the support plate and the lifting sleeve 300 can be released, so that the lifting sleeve 300 is separated from the lifting tool 100.

[0040] Continue to refer to Figure 1 The guide bolt 200 is connected to the lifting tool 100 to provide installation guidance for the lifting tool 100. Specifically, the guide bolt 200 includes a guide connecting section 210 and a guide extension section 220 that are fixedly connected to each other. The guide connecting section 210 is detachably connected to the lifting tool 100, so that the guide bolt 200 can be hoisted to a target position along with the lifting tool 100 and then detached from the lifting tool 100.

[0041] Specifically, the lifting sleeve 300 is sleeved outside the guide bolt 200, and the guide extension section 220 extends out of the lifting sleeve 300. When the guide bolt 200 can be hoisted to the target position following the lifting tool 100, the lifting tool 100, the guide bolt 200 and the lifting sleeve 300 are lowered by the lifting equipment, and the guide extension section 220 first approaches the guide seat 400 and is connected to the guide seat 400, providing a guide for the subsequent lowering of the lifting sleeve 300 and the clamping with the guide seat 400.

[0042] Continue to refer to Figure 1 The guide seat 400 is provided with a centering groove 410 , and the guide bolt 200 can partially extend into the centering groove 410 , thereby realizing the centering and connection between the guide bolt 200 and the guide seat 400 .

[0043] Specifically, the guide extension section 220 is a guide bolt, which is provided with an external thread, and the centering groove 410 is provided with an internal thread. The external thread and the internal thread can be screwed together to stably connect the guide extension section 220 and the centering groove 410 together by screwing.

[0044] Specifically, the bottom surface of the centering groove 410 is a conical surface, the tip of the conical surface is away from the notch of the centering groove 410, and the front end of the guide bolt is a conical tip that matches the conical surface. The conical bottom surface of the groove can provide a receiving cavity for the front end of the guide bolt, increase the connection depth between the guide bolt and the guide seat 400, and ensure the reliability of the installation of the two.

[0045] Continue to refer to Figure 1 The replacement tool provided in this embodiment also includes a connecting device 500, through which the guide connecting section 210 is detachably connected to the lifting tool 100. The connecting device 500 can use a hook assembly in the prior art. The hooks on both sides of the hook assembly are respectively clamped in the end grooves of the lifting connection section 120 and the guide connection section 210, and the central axis is connected to the operating handle, which is located outside the lifting sleeve 300. When the connection between the two needs to be disconnected, the operating handle is operated to drive the hook connected to the guide connection section 210 to rotate so that it is disengaged from the end groove of the guide connection section 210. At this time, the lifting tool 100 is lifted upward to achieve the separation of the guide bolt 200 and the lifting tool 100.

[0046] This embodiment provides a centering method, using the replacement tool, the centering steps include:

[0047] Step 1: Use lifting equipment to transport the lifting tool 100, the guide bolt 200 and the lifting sleeve 300 to the top of the guide seat 400.

[0048] Step 2: perform rough alignment. The hoisting equipment drives the guide bolt 200 and the lifting sleeve 300 to move so that the guide bolt 200 is aligned with the centering groove 410. Figure 2 shown.

[0049] Step 3: The guide extension section 220 extends into the centering groove 410, and the guide extension section 220 is rotated so that it is completely screwed into the centering groove 410. Figure 3 shown.

[0050] Specifically, the connection position between the guide extension section 220 and the guide connecting section 210 is a shoulder structure. When the lifting sleeve 300 is clamped on the outside of the guide seat 400, the guide seat 400 rests against the shoulder structure. The outer wall of the connecting body formed by the outer wall of the guide seat 400 and the outer wall of the guide connecting section 210 is continuous without obvious bosses or depressions.

[0051] Step 4: The lifting sleeve 300 moves in the direction toward the guide seat 400 and is clamped on the outside of the guide seat 400. Figure 4 shown.

[0052] Step 5: After the lifting sleeve 300 is clamped on the outside of the guide seat 400, the operating handle of the connecting device 500 is operated to make it move, disconnect the lifting tool 100 and the guide bolt 200, and complete the connection between the lifting sleeve 300 and the in-pile instrument frame assembly.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A tool replacement, characterized in that: include: A lifting tool (100), one end of the lifting tool (100) being connected to a lifting device; A guide bolt (200), the guide bolt (200) comprising a guide connecting section (210) and a guide extension section (220) which are fixedly connected to each other, and the guide connecting section (210) is detachably connected to the lifting tool (100); A lifting sleeve (300), wherein the lifting sleeve (300) is movably sleeved outside the lifting tool (100) and the guide bolt (200), and the guide extension section (220) extends out of the lifting sleeve (300); The guide seat (400) is connected to the in-pile instrument grid assembly and is provided with a centering groove (410). The guide extension section (220) can extend into the centering groove (410), and the lifting sleeve (300) can be clamped on the guide seat (400).

2. The replacement tool according to claim 1, characterized in that: The lifting tool (100) comprises a fixedly connected lifting section (110) and a lifting connection section (120); the lifting section (110) is provided with a lifting lug, the lifting lug is connected to the lifting device, and the lifting connection section (120) is connected to the guide bolt (200).

3. The replacement tool according to claim 2, characterized in that: The hoisting section (110) is provided with a support plate, which is installed on the side of the lifting ear away from the hoisting device and is clamped on the lifting sleeve (300).

4. The replacement tool according to claim 1, characterized in that: The guide extension section (220) is provided with an external thread, and the centering groove (410) is provided with an internal thread, and the external thread and the internal thread can be threadedly connected to each other.

5. The replacement tool according to claim 1, characterized in that: The bottom surface of the centering groove (410) is a conical surface, and the tip of the conical surface faces away from the notch of the centering groove (410).

6. The replacement tool according to claim 1, characterized in that: It also comprises a connecting device (500), and the guide connecting section (210) is detachably connected to the lifting tool (100) via the connecting device (500).

7. A centering method, characterized in that: Using the replacement tool according to any one of claims 1 to 6, the centering step includes: The guide extension section (220) extends into the centering groove (410); The lifting sleeve (300) moves in a direction toward the guide seat (400) and is clamped on the outside of the guide seat (400).

8. The centering method according to claim 7, characterized in that: A rough centering process is performed before the guide extension section (220) extends into the centering groove (410), and the hoisting equipment drives the guide bolt (200) and the lifting sleeve (300) to move so that the guide bolt (200) faces the centering groove (410).

9. The centering method according to claim 7, characterized in that: The connection position between the guide extension section (220) and the guide connection section (210) is a shoulder structure. When the lifting sleeve (300) is clamped on the outside of the guide seat (400), the guide seat (400) abuts against the shoulder structure.

10. The centering method according to claim 7, characterized in that: The replacement tool also includes a connecting device (500), through which the guide connecting section (210) is detachably connected to the lifting tool (100), and after the lifting sleeve (300) is clamped on the outside of the guide seat (400), the connecting device (500) is actuated to disconnect the connection between the lifting tool (100) and the guide bolt (200).

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