CN215281777U - Blind plate dismounting tool for reactor control rod driving mechanism - Google Patents
Blind plate dismounting tool for reactor control rod driving mechanism Download PDFInfo
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- CN215281777U CN215281777U CN202121276798.4U CN202121276798U CN215281777U CN 215281777 U CN215281777 U CN 215281777U CN 202121276798 U CN202121276798 U CN 202121276798U CN 215281777 U CN215281777 U CN 215281777U
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- blind plate
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- threaded hole
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Abstract
The utility model belongs to the technical field of mechanical equipment extracting tools, in particular to a reactor control rod driving mechanism blind plate extracting tool, which comprises a positioning support circular plate, a rotary pull rod, a sleeve and a grabbing and buckling mechanism; the positioning support circular plate is provided with a middle threaded hole, the side wall of the rotary pull rod is provided with threads matched with the middle threaded hole, the rotary pull rod is positioned in the middle threaded hole and is in threaded fit with the middle threaded hole, the rotary pull rod is perpendicular to the positioning support circular plate, the sleeve is sleeved on the rotary pull rod, the sleeve is in clearance fit with the rotary pull rod, the sleeve is positioned on the lower portion of the positioning support circular plate, the bottom end of the rotary pull rod is provided with a stopping portion, and the grabbing and buckling mechanism is connected with the outer side wall of the sleeve. Aim at solves when lacking suitable instrument, dismantles inefficiency, and can not guarantee operating quality, causes the problem of influence to equipment.
Description
Technical Field
The utility model belongs to the technical field of mechanical equipment extracting tool, concretely relates to reactor control rod drive mechanism blind plate extracting tool to and adopt the blind plate dismantlement method of this instrument.
Background
The biggest difference between a nuclear power plant and a thermal power plant and a hydropower station is that a nuclear reactor is designed, a VVER (B-428) type reactor is provided with 121 control rod driving mechanisms, 121 connecting pipe flanges 2 are arranged on a reactor top cover pipe body 1 and used for installing the control rod driving mechanisms, 103 driving mechanisms are usually installed, blind plates 5 are installed on 18 top cover connecting pipe flanges 2 for sealing, and the blind plates are fastened by blind plate bolts 3 and blind plate nuts 4 (figure 1). When the reactor is disassembled and overhauled, the blind plate 5 needs to be disassembled, and then the reactor is reassembled after service inspection. After long-time high-temperature and high-pressure operation (321 ℃/15.7MPa), the sealing gaskets 6 between the blind plate 5 and the pipe connecting flange 2 are adhered and rubbed, the blind plate 5 is very difficult to disassemble, due to the lack of a proper tool, the blind plate 5 is disassembled by utilizing a hoisting hole (figure 2) on the top of the blind plate 5, a cantilever crane is used for upwards pulling, and then a copper bar is manually used for knocking and vibrating, so that the blind plate 5 is slowly loosened and separated from the pipe connecting flange 2. The method for disassembling the blind plate 5 is easy to cause the blind plate 5 to deflect, and the sealing surfaces of the flange 2 of the connecting pipe and the blind plate 5 are damaged by pulling, thereby causing adverse effects on the sealing of the reactor; the cantilever crane is lifted upwards and the copper rod vibrates, so that a welding seam between the pipe body 1 of the butt joint pipe and the top cover of the reactor is influenced to a certain degree; in addition, due to the low efficiency of the disassembly of the blind plate 5, the overhaul period of the nuclear power plant is prolonged, and meanwhile, the operators are subjected to more radiation doses in a high-radiation environment.
Based on the method for disassembling the VVER (B-428) type reactor driving mechanism blind plate 5, the overhaul period of a nuclear power plant and the quality of maintenance work are influenced, and a special tool for disassembling the blind plate 5 is necessary to be designed, so that the quality of the maintenance work is ensured, and the working efficiency is improved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses there is the dismantlement inefficiency to the current dismantlement mode of reactor control rod drive mechanism blind plate, and dismantles the problem that the in-process easily produces harmful effects to the leakproofness, provides a reactor control rod drive mechanism blind plate extracting tool to and adopt the blind plate dismantlement method of this instrument, when aim at solves and lacks suitable instrument, dismantle inefficiency, and can not guarantee operating mass, cause the problem of influence to equipment.
The utility model discloses a following technical scheme realizes:
the blind plate dismounting tool for the reactor control rod driving mechanism comprises a positioning support circular plate, a rotary pull rod, a sleeve and a catching mechanism; the positioning support circular plate is provided with a middle threaded hole, the side wall of the rotary pull rod is provided with threads matched with the middle threaded hole, the rotary pull rod is positioned in the middle threaded hole, the rotary pull rod is in threaded fit with the middle threaded hole, the rotary pull rod is perpendicular to the positioning support circular plate, the sleeve is sleeved on the rotary pull rod, the sleeve is in clearance fit with the rotary pull rod, a stopping portion is arranged at the bottom end of the rotary pull rod, the sleeve is positioned above the stopping portion below the positioning support circular plate, and the grabbing and buckling mechanism is connected with the outer side wall of the sleeve. According to the scheme, the blind plate bolts are used as supporting points, so that the weak welding joints such as a pipe connecting flange are prevented from being adversely affected, and the sealing performance of the system is guaranteed; in addition, this scheme adopts the structural principle that the screw rod promoted, dismantles efficiency and obtains promoting greatly.
Preferably, the buckle grabbing mechanism comprises a chain plate and a pulling claw, the top end of the chain plate is hinged with the outer side wall of the sleeve, the bottom end of the chain plate is hinged with the top end of the pulling claw, and the bottom end of the pulling claw is provided with a claw tip end facing the inner side. The two ends of the chain plate structure are hinged, so that the claw tip of the pull claw can be matched with a blind plate to be disassembled, and the efficiency of disassembling and improving acting force is higher.
Furthermore, the buckle grabbing mechanisms are provided with 3 groups, and the 3 groups of buckle grabbing mechanisms are uniformly distributed in a 120-degree angle circumference manner. This scheme adopts 3 groups to grab to detain the mechanism and can firmly grab to detain and treat and dismantle the blind plate.
According to the preferable scheme, the blind plate disassembling tool further comprises an adjusting bolt, the positioning supporting circular plate is provided with a peripheral threaded hole, the adjusting bolt is located in the peripheral threaded hole, the adjusting bolt is in threaded fit with the peripheral threaded hole, and the adjusting bolt corresponds to the blind plate bolt in position. The scheme provides a structural scheme for keeping the positioning support circular plate and the blind plate to be detached parallel, and further avoids the risk that the structure is influenced due to uneven stress.
Furthermore, the bottom of the adjusting bolt is provided with a limiting sleeve, and the limiting sleeve is in clearance fit with the blind plate bolt. During blind plate bolt embedding position sleeve, the instrument position remains stable in the dismantlement process.
Preferably, the positioning support circular plate is provided with lightening holes, and the lightening holes are positioned between the middle threaded holes and the peripheral threaded holes. The lightening holes can ensure the structural strength and reduce unnecessary material usage, thereby reducing the total weight of the blind plate disassembling tool.
Preferably, the top of the rotating pull rod is provided with an anti-rotating structure, and a wrench and the like can be adopted to provide torque to rotate the rotating pull rod.
Furthermore, the blind plate disassembling tool further comprises a force application handle, the anti-rotation structure of the rotary pull rod is of a rectangular cross section structure, the middle part of the force application handle is provided with a rectangular hollow part matched with the anti-rotation structure in shape, and the rectangular hollow part of the force application handle is sleeved on the anti-rotation structure of the rotary pull rod and fastened through a rotary pull rod nut. Supporting application of force handle has been add to this scheme, and direct rotatory application of force handle need not extra appurtenance during the use, and convenient operation and work efficiency are higher.
The scheme also provides a method for disassembling the blind plate of the control rod driving mechanism of the reactor, and the method for disassembling the blind plate of the control rod driving mechanism of the reactor comprises the following steps:
the method comprises the following steps: the positioning supporting circular plate is placed on the blind plate bolt, and the blind plate bolt is used as a lifting supporting point, so that the influence of stress on the system structure on the sealing performance is avoided;
step two: placing the claw tip of the pulling claw at the bottom of the edge of the blind plate to be disassembled; if the tip of the claw can not touch the bottom of the edge of the blind plate, the force application handle is rotated to enable the rotary pull rod to move downwards;
step three: the positioning supporting circular plate takes the blind plate bolt as a supporting point, the force application handle is rotated to enable the rotary pull rod to move upwards, and the rotary pull rod drives the sleeve, the chain plate and the pull claw to move upwards in sequence, so that the blind plate is lifted and detached. This scheme adopts the mode that the screw rod promoted, convenient operation dismantles efficiency and can greatly promote.
Preferably, the first step further comprises a horizontal adjustment process, wherein the blind plate bolt is placed in the adjusting bolt limiting sleeve, and the adjusting bolt is rotated to enable the positioning supporting circular plate to be parallel to the blind plate to be disassembled. In order to enable the acting force for lifting the blind plate to be perpendicular to the blind plate and avoid the adverse effect on the system structure caused by uneven slope of the acting force, the scheme adjusts the levelness of the positioning supporting circular plate through the adjusting bolt.
To sum up, compared with the prior art, the utility model, have following advantage and beneficial effect: the utility model discloses a special blind plate extracting tool of design reactor control rod drive mechanism has promoted when dismantling efficiency, dismantles the in-process and does not have the influence to system architecture to do not influence system architecture's leakproofness, guarantee operating mass with rated load.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is an assembly view of a flange and blind flange configuration of an embodiment.
FIG. 2 is a sectional view of an embodiment of a blind structure.
FIG. 3 is a side view block diagram of an embodiment blind plate removal tool.
FIG. 4 is a perspective view of the blind plate removal tool according to one embodiment.
FIG. 5 is a lower side view of the blind extractor of the present embodiment.
FIG. 6 is a schematic diagram of an embodiment blind plate removal tool.
Reference numbers and corresponding part names: 1-pipe body, 2-pipe connecting flange, 3-blind nut, 4-blind bolt, 5-blind plate and 6-sealing washer; 7-a blind plate disassembling tool, 701-a positioning supporting circular plate, 702-a rotary pull rod, 703-a sleeve, 704-a chain plate, 705-a pulling claw, 706-an adjusting bolt and 707-a force application handle.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it should be understood that the terms "front", "back", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the present invention.
The present embodiment has to dismantle inefficiency to the current dismantlement mode of reactor control rod drive mechanism blind plate, and dismantles the problem that the in-process easily produces harmful effects to the leakproofness, provides a reactor control rod drive mechanism blind plate extracting tool to and adopt the blind plate dismantlement method of this instrument, when aim at solve and lack suitable instrument, dismantle inefficiency, and can not guarantee operating quality, cause the problem of influence to equipment.
The embodiment is realized by the following technical scheme:
a reactor control rod drive mechanism blind plate removal tool 7 is provided, as shown in FIGS. 3-5, comprising a positioning support circular plate 701, a rotation pull rod 702, a sleeve 703, a catch mechanism 704 and 705; the positioning supporting circular plate 701 is provided with a middle threaded hole, the side wall of the rotating pull rod 702 is provided with threads matched with the middle threaded hole, the rotating pull rod 702 is located in the middle threaded hole, the rotating pull rod 702 is in threaded fit with the middle threaded hole, the rotating pull rod 702 is perpendicular to the positioning supporting circular plate 701, the sleeve 703 is sleeved on the rotating pull rod 702, the sleeve 703 is in clearance fit with the rotating pull rod 702, the bottom end of the rotating pull rod 702 is provided with a stopping portion to prevent the sleeve 703 from being separated from the bottom end, the sleeve 703 is located above the stopping portion below the positioning supporting circular plate 701, and the grabbing and buckling mechanism 704 is connected with the outer side wall of the sleeve 703. The positioning support disk 701 serves two purposes: firstly, the blind plate disassembling tool 7 is positioned on the blind plate 5 in the center; the other is a force support to transmit the lifting force of the sleeve 703 to the catch mechanism 704 and 705. According to the scheme, the blind plate bolts 4 are used as supporting points, so that the weak welding joints such as the pipe connecting flange 2 are prevented from being adversely affected, and the system tightness is guaranteed; in addition, this scheme adopts the structural principle that the screw rod promoted, dismantles efficiency and obtains promoting greatly.
As shown in fig. 3-5, the catch mechanism of this embodiment includes a link plate 704 and a pull claw 705, the top end of the link plate 704 is hinged to the outer side wall of the sleeve 703 through a hinge ring structure, the bottom end of the link plate 704 is hinged to the top end of the pull claw 705 through a hinge ring, the hinge part is hinged through a hinge hole and a bolt M8, and the bottom end of the pull claw 705 is provided with a claw tip facing inward and capable of penetrating into the gap between the blind plate 5 and the pipe connecting flange 2. The function of the sleeve 703 is two-fold: firstly, the rotating pull rod 702 is connected to convert the rotating torque into the upward lifting force of the sleeve; secondly, the chain plate 704 and the pulling claw 705 are connected, and lifting force is uniformly distributed at an angle of 120 degrees. Two ends of the chain plate 704 structure are hinged, so that the claw tip of the pulling claw 705 can be matched with the blind plate 5 to be disassembled, and the efficiency of disassembling and improving acting force is higher. Further, the catching mechanisms 704 and 705 are provided with 3 groups, and the 3 groups of catching mechanisms are circumferentially and uniformly distributed at an angle of 120 degrees. This scheme adopts 3 groups to grab to detain the mechanism and can firmly grab to detain and treat and dismantle blind plate 5.
As shown in fig. 3 to 5, the blind plate removing tool 7 of this embodiment further includes an adjusting bolt 706, the positioning supporting circular plate 701 is provided with a peripheral threaded hole, the adjusting bolt 706 is located in the peripheral threaded hole, the adjusting bolt 706 is in threaded fit with the peripheral threaded hole, and the adjusting bolt 706 corresponds to the blind plate bolt 4 in position. The adjusting bolt 706 serves two purposes: firstly, positioning a blind plate disassembling tool 7 on a blind plate 5; and secondly, adjusting the levelness of the blind plate disassembling tool 7 to keep the lifting direction of the blind plate disassembling tool vertical to the blind plate 5. The scheme provides a structural scheme for keeping the positioning support circular plate 701 and the blind plate 5 to be detached parallel, and further avoids the risk that the structure is influenced due to uneven stress. Further, as shown in fig. 5, the bottom of the adjusting bolt 706 is provided with a stop collar, and the stop collar is in clearance fit with the blind bolt 4. The blind plate bolt 4 is embedded into the positioning sleeve, and the position of the tool is kept stable in the dismounting process. In addition, as shown in fig. 4 to 5, the positioning support circular plate 701 is provided with lightening holes between the central threaded hole and the peripheral threaded hole. The unnecessary material use is reduced when guaranteeing structural strength, alleviates blind plate extracting tool 7's total weight.
As shown in fig. 3-4, the rotation-preventing structure is provided at the top of the rotation-preventing structure, and a wrench or the like can be used to provide torque to rotate the rotation-preventing structure 702. The blind plate removal tool 7 of the embodiment further comprises a force application handle 707, the anti-rotation structure of the rotating pull rod 702 is a rectangular cross-section structure, the middle part of the force application handle 707 is provided with a rectangular hollow part matched with the anti-rotation structure in shape, and the rectangular hollow part of the force application handle 707 is sleeved on the anti-rotation structure of the rotating pull rod 702 and fastened through a rotating pull rod nut. This scheme has add supporting application of force handle 707 and has given rotation pull rod 702 to apply torque, and direct rotation application of force handle 707 need not extra appurtenance during the use, and convenient operation and work efficiency are higher.
The embodiment also provides a method for disassembling the blind plate of the control rod drive mechanism of the reactor, and the method for disassembling the blind plate of the control rod drive mechanism of the reactor 7 comprises the following steps as shown in fig. 6: before use, the blind plate disassembling tool 7 is checked and confirmed to be intact, and the whole blind plate disassembling tool is free from deformation and defect
The method comprises the following steps: the positioning supporting circular plate 701 is placed on the blind plate bolt 4, and the blind plate bolt 4 is used as a lifting supporting point, so that the influence of stress on the system structure on the sealing performance is avoided;
step two: placing the claw tip of the pulling claw 705 at the bottom of the edge of the blind plate 5 to be disassembled; if the tip of the claw can not touch the bottom of the edge of the blind plate 5, the force application handle 707 is rotated to move the rotary pull rod 702 downwards;
step three: the positioning supporting circular plate 701 takes the blind plate bolt 4 as a supporting point, the force application handle 707 is rotated to move the rotating pull rod 702 upwards, and the rotating pull rod 702 drives the sleeve 703, the chain plate 704 and the pull claw 705 to move upwards in sequence, so that the blind plate 5 is lifted and detached. This scheme adopts the mode that the screw rod promoted, convenient operation dismantles efficiency and can greatly promote.
Preferably, in the step one, a horizontal adjustment procedure is further included, the blind plate bolt 4 is placed in a limiting sleeve of the adjusting bolt 706, and the adjusting bolt 706 is rotated to enable the positioning supporting circular plate 701 to be parallel to the blind plate 5 to be detached. In order to enable the acting force for lifting the blind plate to be perpendicular to the blind plate 5 and avoid adverse effects on the system structure caused by uneven acting force inclination, the levelness of the positioning support circular plate 701 is adjusted by the adjusting bolt 706.
In summary, in the present embodiment, by designing the dedicated blind plate removal tool for the reactor control rod drive mechanism, the torque applied to the rotation tie rod 702 by the force application handle 707 is converted into an upward lifting force of the sleeve 703 through the positioning support circular plate 701. When having promoted dismantlement efficiency, there is not the influence to system architecture among the dismantlement process to do not influence system architecture's leakproofness, guarantee operating mass with rated load.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The blind plate dismounting tool for the reactor control rod driving mechanism is characterized by comprising a positioning support circular plate, a rotary pull rod, a sleeve and a catching mechanism; the positioning support circular plate is provided with a middle threaded hole, the side wall of the rotary pull rod is provided with threads matched with the middle threaded hole, the rotary pull rod is positioned in the middle threaded hole, the rotary pull rod is in threaded fit with the middle threaded hole, the rotary pull rod is perpendicular to the positioning support circular plate, the sleeve is sleeved on the rotary pull rod, the sleeve is in clearance fit with the rotary pull rod, a stopping portion is arranged at the bottom end of the rotary pull rod, the sleeve is positioned above the stopping portion below the positioning support circular plate, and the grabbing and buckling mechanism is connected with the outer side wall of the sleeve.
2. The reactor control rod drive mechanism blind plate removal tool of claim 1, wherein the catch mechanism comprises a flight and a pull pawl, a flight top end is hinged to the sleeve outer sidewall, a flight bottom end is hinged to the pull pawl top end, and the pull pawl bottom end is provided with an inwardly facing pawl tip.
3. The reactor control rod drive mechanism blind plate removal tool of claim 1 or 2, wherein 3 groups of the catch mechanisms are provided, and the 3 groups of catch mechanisms are circumferentially and uniformly distributed at an angle of 120 degrees.
4. The reactor control rod drive mechanism blind plate removal tool of claim 2, further comprising an adjusting bolt, wherein the positioning support circular plate is provided with a peripheral threaded hole, the adjusting bolt is located in the peripheral threaded hole, the adjusting bolt is in threaded fit with the peripheral threaded hole, and the adjusting bolt corresponds to the blind plate bolt in position.
5. The reactor control rod drive mechanism blind plate removal tool of claim 4, wherein the bottom of the adjusting bolt is provided with a stop collar, and the stop collar is in clearance fit with the blind plate bolt.
6. The reactor control rod drive mechanism blind plate removal tool as set forth in claim 4 or 5, wherein the positioning support circular plate is provided with lightening holes, and the lightening holes are located between the central threaded hole and the peripheral threaded holes.
7. The reactor control rod drive mechanism blind plate removal tool of claim 5, wherein the top of the tie rod is provided with an anti-rotation structure.
8. The reactor control rod drive mechanism blind plate disassembly tool of claim 7, further comprising a force application handle, wherein the rotation prevention structure of the rotating pull rod is a rectangular cross-section structure, a rectangular hollow part matched with the rotation prevention structure in shape is arranged in the middle of the force application handle, and the rectangular hollow part of the force application handle is sleeved on the rotation prevention structure of the rotating pull rod and is fastened through a nut of the rotating pull rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121276798.4U CN215281777U (en) | 2021-06-08 | 2021-06-08 | Blind plate dismounting tool for reactor control rod driving mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121276798.4U CN215281777U (en) | 2021-06-08 | 2021-06-08 | Blind plate dismounting tool for reactor control rod driving mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215281777U true CN215281777U (en) | 2021-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121276798.4U Active CN215281777U (en) | 2021-06-08 | 2021-06-08 | Blind plate dismounting tool for reactor control rod driving mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215281777U (en) |
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2021
- 2021-06-08 CN CN202121276798.4U patent/CN215281777U/en active Active
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