CN113020724A

CN113020724A - Device for repairing threaded hole of flange under working condition of limited space and using method

Info

Publication number: CN113020724A
Application number: CN202110475045.4A
Authority: CN
Inventors: 雷家维; 谢丹; 陈耀茂; 刘远彬; 李萌; 韩峰; 颜建文; 王勇华
Original assignee: Dec Guangzhou Heavy Machinery Co ltd
Current assignee: Dec Guangzhou Heavy Machinery Co ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-06-25

Abstract

The invention belongs to the technical field of threaded hole repair, and particularly provides a repair device for a flange threaded hole under a space-limited working condition and a use method, wherein the repair device mainly comprises a mounting plate and a positioning assembly; the mounting plate is provided with a first through hole, a plurality of second through holes and a repair processing station which is reserved corresponding to the threaded hole to be repaired; the positioning assembly comprises a positioning column piece and at least one double-headed bolt piece, the positioning column piece comprises a positioning end and a fixing end, and the diameter width of the positioning end is matched with the diameter width of the eyelet; the positioning end is inserted into the eyelet, and the fixed end penetrates through the first eyelet and is connected and fixed with the fastener; one end of the stud piece is in threaded connection with the threaded hole, and the other end of the stud piece penetrates through the second through hole and is fixedly connected with the fastener. The invention can effectively ensure the conditions of other threaded holes when the defective threaded hole is repaired, and improve the reliability of the repairing operation of the threaded hole.

Description

Device for repairing threaded hole of flange under working condition of limited space and using method

Technical Field

The invention belongs to the technical field of threaded hole repair, and particularly relates to a repair device for a flange threaded hole under a space-limited working condition and a use method.

Background

The steam generator is one of main equipment of a nuclear island of the nuclear power station, an eyelet is reserved on the steam generator, a connecting flange is arranged at the eyelet, and four connecting threaded holes are formed in the connecting flange around the eyelet. In the actual use process, when a steam generator is transported to a power station and installed in place on site, the situation that a certain threaded hole cannot be normally used due to tooth decay and the like is sometimes found, and the traditional treatment method is generally to ream and tap the threaded hole with problems and then install a threaded sleeve so as to recover the design function of the threaded hole; in the prior art, a prosthetic device and method have also been proposed, as shown in the patent application No. 202010429512.5.

However, in this way, the support plate needs to be fixed by the remaining three intact threaded holes, and the magnetic drill is arranged on the support plate to perform operations such as drilling, reaming, tapping and the like, so that vibration, equipment dead weight and construction risks occurring in the maintenance operation process can be transferred to other intact threaded holes, and the condition of considering one another is easily caused once the operation is not proper; moreover, this phenomenon is more pronounced when the number of problematic screw holes is more than one.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a device and a method for repairing a threaded hole of a flange under a space-limited working condition, which can effectively ensure the conditions of other threaded holes when the threaded hole with the problem is repaired, and improve the reliability of the repairing operation of the threaded hole.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a device for repairing a flange threaded hole under a space-limited working condition comprises a mounting plate and a positioning assembly, wherein the mounting plate is used for mounting and fixing a magnetic drill;

a first through hole is formed in the mounting plate corresponding to the eyelet of the connecting flange, a plurality of second through holes are formed in the mounting plate corresponding to the threaded holes of the connecting flange, and a repair processing station is reserved corresponding to the threaded holes to be repaired;

the positioning assembly comprises a positioning column piece and at least one double-headed bolt piece, the positioning column piece comprises a positioning end and a fixing end, and the diameter width of the positioning end is matched with the diameter width of the eyelet; when the fixing device is in an installation state, the positioning end is inserted into the eyelet, and the fixing end penetrates through the first through hole and is connected and fixed with the fastening piece; one end of the stud piece is in threaded connection with the threaded hole, and the other end of the stud piece penetrates through the second through hole and is fixedly connected with the fastener.

Preferably, the positioning column piece comprises a bolt piece, a follower arranged on the bolt piece in a penetrating way, a first wedge block arranged on the bolt piece in a penetrating way, and a plurality of second wedge blocks matched with the first wedge blocks;

and a sliding inclined surface is arranged between the first wedge block and the second wedge block, the follower can slide to be in contact with the second wedge block along with the rotation of the bolt piece and promote the relative sliding of the second wedge block and the first wedge block, and the outer side surface of the second wedge block can slide to be abutted against the inner wall of the eyelet.

Preferably, the first wedge block is arranged in a frustum shape, and a plurality of first inclined planes are arranged on the outer peripheral surface of the first wedge block around the central axis; the inner side of the second wedge block is provided with a second inclined surface corresponding to the first inclined surface, and the outer side of the second wedge block is provided with an arc-shaped surface matched with the inner wall of the eyelet.

Preferably, one side of the connecting flange, which is far away from the first via hole and the second via hole, is provided with a countersunk structure, the fixed end is fixedly connected with the fastener, and the stud piece is fixedly connected with the fastener and is positioned in the countersunk structure.

Preferably, an auxiliary positioning plate is further arranged between the connecting flange and the mounting plate, and a hollow area is arranged on the auxiliary positioning plate corresponding to the eyelet; the auxiliary positioning plate is coaxially provided with a positioning hole corresponding to the threaded hole, and a guide hole corresponding to the threaded hole to be repaired is coaxially provided.

Preferably, a protrusion is arranged at the position of the eye hole, and a concave surface is arranged on one side, facing the eye hole, of the auxiliary positioning plate and corresponds to the protrusion.

Preferably, a guide block is further disposed corresponding to the guide hole, and the guide block is detachably mounted on the auxiliary positioning plate.

Preferably, a clamping groove is formed in the maintenance processing position corresponding to the guide block, and the guide block is clamped in the clamping groove.

A use method of a device for repairing a flange threaded hole under a space-limited working condition is suitable for the device for repairing the flange threaded hole under the space-limited working condition, and comprises the following steps:

pre-mounting the positioning column on the mounting plate, inserting the positioning end of the positioning column into the eyelet, and arranging the stud member in a perfect threaded hole of at least one of the connecting flanges to pre-mount the mounting plate;

arranging a magnetic drill on the mounting plate, adjusting the coaxiality of a main shaft of the magnetic drill and a threaded hole to be repaired, and then performing reaming and tapping operation step by step;

and after tapping is finished, installing the threaded bushing in the repaired threaded hole, and completing repair operation after the magnetic drill and the installing plate are removed.

Furthermore, when the mounting plate is mounted, an auxiliary positioning plate is arranged between the connecting flange and the mounting plate, a positioning hole is coaxially arranged on the auxiliary positioning plate corresponding to the threaded hole, and the stud member is arranged in the positioning hole in a penetrating manner;

the auxiliary positioning plate is coaxially provided with a guide hole corresponding to the threaded hole to be repaired, a positioning rod is arranged on the magnetic drill before reaming, and the coaxiality of a main shaft of the magnetic drill and the threaded hole to be repaired is adjusted through the assembly relation of the positioning rod and the guide hole;

and a guide block is further arranged corresponding to the guide hole, after the coaxiality of the main shaft of the magnetic drill and the threaded hole to be repaired is determined, the positioning rod is replaced by the expanding drill, and the guide block and the threaded hole to be repaired are subjected to expanding operation sequentially.

Compared with the prior art, the invention has the beneficial effects that:

be provided with ingeniously in this scheme the location post to wide the diameter that sets up the location post into with the eyelet is worth the adaptation, make when treating the rework screw hole and carry out processing operation, the location end of location post supports the contact for inserting the top that sets up in the eyelet in order to form with the eyelet inner wall, thereby can regard as main atress part in order to carry out the power of unloading to equipment such as mounting panel and magnetic drill, because the wide diameter that is greater than the screw hole of eyelet is wide, consequently main atress can fall on the location post, thereby play better guard action to the screw hole that need not to rework, ensure that the state of the screw hole that need not to rework is good.

And add man-hour, only need carry out the installation of stud spare to one of them screw hole, nevertheless the installation of cooperation location post can realize the location installation to the mounting panel, when can guaranteeing the state of intact screw hole, the mode of two point location is more simple and convenient in using, can effectively reduce the operation consuming time to the flexibility is high, can effectively deal with the circumstances when having 2 or 3 screw holes to reprocess simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of the present invention in an operating state.

Fig. 2 is a schematic view of the mounting plate of the present invention looking down.

Fig. 3 is a schematic structural diagram of the mounting plate of the present invention.

Fig. 4 is a schematic view of the structure of the follower of the present invention.

FIG. 5 is a schematic structural view of the first wedge of the present invention.

FIG. 6 is a schematic view of a second wedge of the present invention.

Fig. 7 is a schematic structural view of an auxiliary positioning plate according to the present invention.

Fig. 8 is a schematic view of the construction of the stud member of the present invention.

Fig. 9 is a schematic structural view of the guide block of the present invention.

Wherein:

1-eyelet, 2-connecting flange, 3-mounting plate, 31-countersunk structure, 32-clamping groove, 4-magnetic drill, 41-main shaft, 5-positioning column part, 51-bolt part, 52-follower, 53-first wedge block, 531-first inclined surface, 54-second wedge block, 541-second inclined surface, 542-arc surface, 6-double-head bolt part, 61-convex ring part, 7-auxiliary positioning plate, 71-hollow area, 72-positioning hole, 73-guide hole, 74-backing ring and 8-guide block.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

As shown in fig. 1 to 9, the embodiment provides a device for repairing a threaded hole of a flange under a limited space condition, which is mainly applied to repairing a threaded hole on a connecting flange 2 at an eyelet 1 of a steam generator in a nuclear power station, and specifically includes a mounting plate 3, a positioning assembly and a magnetic drill 4; in this embodiment, the magnetic drill 4 is a mad 800 type magnetic drill.

Mounting panel 3 is a rectangle plate, correspond eyelet 1 on flange 2 on the mounting panel 3 and be provided with first via hole, correspond the screw hole on flange 2 and be provided with a plurality of second via holes and correspond and wait to reprocess the screw hole reservation and be provided with and reprocess the station. In this embodiment, three second via holes are provided, and based on the structural design of the connection flange 2, two of the second via holes are symmetrically disposed on two sides of the eyelet 1 and are disposed on the same straight line as the eyelet 1, and a connecting line between the other second via hole and the eyelet 1 is exactly perpendicular to the straight line, so that the second via hole is disposed on one side of the straight line, and the rework station is disposed on the other side of the straight line.

The positioning assembly comprises a positioning column piece 5 and at least one stud piece 6, the positioning column piece 5 comprises a positioning end and a fixing end, and the diameter width of the positioning end is matched with the diameter width of the eyelet 1; when the positioning device is in an installation state, the positioning end is inserted into the eyelet so that the periphery of the positioning end is in abutting contact with the inner wall of the eyelet 1, and the fixed end penetrates through the first through hole and is connected and fixed with a fastener; one end of the stud member 6 is in threaded connection with the threaded hole, and the other end of the stud member 6 passes through the second through hole and is fixedly connected with a fastener.

As a preferable scheme, the positioning column 5 in this embodiment includes a bolt 51, a follower 52 penetrating through the bolt 51, a first wedge 53 penetrating through the bolt 51, and a plurality of second wedges 54 matching with the first wedges 53; a sliding inclined surface is provided between the first wedge 53 and the second wedge 54, the follower 52 can slide to contact with the second wedge 54 along with the screwing rotation of the bolt piece 51 and promote the relative sliding of the second wedge 54 and the first wedge 53, and the outer side surface of the second wedge 54 can slide to abut against the inner wall of the eyelet 1. Due to the ingenious design of the positioning column piece 5, the relative sliding between the first wedge block 53 and the second wedge block 54 can change the maximum diameter width of the periphery of the positioning column piece 5 through the linkage between the parts, so that in the actual application process, the positioning column piece 5 can adapt to the eyelets 1 with different sizes and the eyelets 1 with different inner wall conditions, and the applicability and the reliability of the repair device are further improved.

Further, the first wedge 53 is disposed in a frustum shape, and a plurality of first inclined surfaces 531 are disposed on an outer peripheral surface of the first wedge 53 around a central axis, in this embodiment, the first inclined surfaces 531 are disposed in a plurality and are uniformly disposed around the central axis of the first wedge 53; a second inclined surface 541 is provided on the inner side of the second wedge 54 corresponding to the first inclined surface 531, and the first inclined surface 531 and the second inclined surface 541 are flush with each other in the attached state. The outer side of the second wedge 54 is preferably set to be an arc-shaped surface 542 matched with the inner wall of the eyelet 1, so that the attaching performance of the outer side surface of the second wedge 54 and the inner wall surface of the eyelet 1 is further improved, the stress surface of the positioning column 5 is enlarged, and the stable stress is ensured.

In addition, first via hole, second via hole are kept away from flange 2's one side is provided with countersunk head structure 31, the stiff end is fixed with being connected of fastener stud spare 6 all is located with being connected of fastener countersunk head structure 31 in, so that mounting panel 3 dorsad flange 2's a side can keep higher roughness, so that magnetic drill 4's installation and adjustment. Wherein, the fastener is a gasket and a nut.

Furthermore, an auxiliary positioning plate 7 is further arranged between the connecting flange 2 and the mounting plate 3, and a hollow area 71 is arranged on the auxiliary positioning plate 7 corresponding to the eyelet 1, so that the positioning column 5 can be conveniently mounted and used; the auxiliary positioning plate 7 is coaxially provided with a positioning hole 72 corresponding to the threaded hole, and a guide hole 73 corresponding to the threaded hole to be repaired. In practical situations, the part of the eyelet 1 and the outer surface of the connecting flange 2 are not a flat surface, but a protrusion is arranged at the part of the eyelet 1, which may affect the stable installation of the mounting plate; therefore, a concave surface is provided on the side of the positioning assistance plate 7 disposed toward the eyelet 1 corresponding to the protrusion, so that the positioning assistance plate 7 can be mounted flush with the eyelet 1, and then the outer side surface of the positioning assistance plate 7 is set to be a flat surface, so as to facilitate the mounting of the mounting plate 3.

As a preferable scheme, a guide block 8 is further disposed corresponding to the guide hole 73, and the guide block 8 is detachably mounted on the auxiliary positioning plate 7, for example, by fastening with a screw. In addition, maintenance processing position department corresponds guide block 7 sets up draw-in groove 32 in addition, guide block 8 is established for the card in the draw-in groove 32, through guide block 8 with fixed mounting between the assistance-localization real-time board 7 guide block 8 with the joint of draw-in groove 32 and mounting panel 3 with fixed mounting between the assistance-localization real-time board 7 to form linkage location, holistic structural stability is higher.

In order to facilitate further understanding of the scheme, in this embodiment, a method for using the device for repairing the flange threaded hole under the space-limited working condition is further provided, and the method is suitable for the device for repairing the flange threaded hole under the space-limited working condition, and specifically includes the following steps:

s10, cleaning the eyelet 1 and a connecting flange 2 at the eyelet 1, and selecting or arranging the stud piece 6, wherein a convex ring part 61 with a smooth outer surface is arranged in the middle of the stud piece 6, and at least one stud piece 6 is installed in one intact threaded hole according to the actual repair condition; in this embodiment, a threaded hole below the eyelet 1 is preferred, which is more protected.

S20, sleeving the auxiliary positioning plate 7 on the stud member 6 corresponding to the eyelet 1, wherein a positioning hole 72 on the auxiliary positioning plate 7 is matched with the convex ring portion 61 on the stud member 6, and in this embodiment, the positioning hole 72 is matched with the diameter width of the convex ring portion 61; and the guide hole 73 of the auxiliary positioning plate 7 is aligned with the threaded hole to be repaired, in this embodiment, the diameter width of the guide hole 73 is preferably larger than that of the threaded hole to be repaired.

S30, pre-mounting the positioning column 5 in the eyelet 1 or on the mounting plate 3, inserting and arranging a positioning end of the positioning column 5 in the eyelet 1, specifically, firstly, extending a cap end of the bolt 51 in the eyelet 1 to enable a threaded end of the bolt 51 to extend out and be arranged as a fixed end, then sequentially penetrating the follower 52 on the bolt 51, flatly placing the second wedge 54 on the first wedge 53, and penetrating the first wedge 53 on the bolt 51 to be sent into the eyelet 1; at this time, in order to avoid that the reaction time of the first wedge 53 and the second wedge 54 is too long or the length of the whole positioning column 5 extending into the eyelet 1 is too short, a backing ring 74 may be further disposed on the outer side of the first wedge 53, and the diameter width of the backing ring 74 may be made to be consistent with the diameter width of the hollow area 71 of the auxiliary positioning plate 7, and the thickness of the backing ring 74 is the sum of the thicknesses of the hollow area 71 and the protrusion of the eyelet 1.

S40, mounting the mounting plate 3, enabling the fixed end to penetrate through the first through hole and the stud piece 6 to penetrate through the second through hole, enabling the fixing end to be pre-fixed to the mounting plate 3 through a fastener and at least one stud piece 6, enabling the first wedge block 53 and the second wedge block 54 to slide relatively through tightening of the fastener and the fixed end, enabling abutting contact between the inner wall of the eyelet 1 to be formed, and completing fastening and mounting of the mounting plate 3.

S50, arranging a magnetic drill 4 on the mounting plate 3, adjusting the coaxiality of a main shaft 41 of the magnetic drill 4 and a threaded hole to be repaired, and then performing reaming and tapping operation step by step; before reaming operation, firstly installing a positioning rod on the magnetic drill 4, adjusting the coaxiality of the main shaft 41 of the magnetic drill 4 and the threaded hole to be repaired through the assembling relation between the positioning rod and the guide hole 73, for example, setting the diameter width of the positioning rod to be matched with the diameter width of the guide hole 73, rotating the positioning rod to be inserted into the guide hole 73, and adjusting the coaxiality of the positioning rod and the inner wall of the guide hole 73 by judging the contact condition between the positioning rod and the inner wall of the guide hole 73; after the coaxiality of the main shaft 41 of the magnetic drill 4 and the threaded hole to be repaired is determined, the positioning rod is replaced by a reamer, and the guide block 8 and the threaded hole to be repaired are sequentially subjected to reaming operation.

S60, when hole expanding operation is carried out, the guide block 8 is installed corresponding to the guide hole 73, wherein a threaded hole can be pre-drilled in the guide block 8, coaxiality between the guide block and the threaded hole in the connecting flange 2 is detected through tools such as a bolt column, and hole expanding operation can be directly carried out after the guide block 8 is installed, so that the whole working hour is saved, and hole expanding is more stable and reliable; in reaming, the amount of single cut should be tightly controlled to ensure the quality of the machining.

S70, after reaming is finished and the size detection is qualified, replacing a screw tap with a reaming drill and installing the reaming drill on a magnetic drill 4, using the magnetic drill 4 to conduct auxiliary guiding to manually complete tapping operation, detecting the threading through a check gauge to be qualified after the threading is finished, installing a threaded bushing in a threaded hole after the threaded hole is cleaned and repaired, and then dismantling auxiliary tools such as the magnetic drill 4 and an installation plate 3 to complete the repair operation.

In this embodiment, the specific structural form of the steam generator can be referred to the prior art, and is not described herein.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A device for repairing a flange threaded hole under a space-limited working condition is characterized by comprising a mounting plate and a positioning assembly, wherein the mounting plate is used for mounting and fixing a magnetic drill;

2. The device for repairing a threaded flange hole under the condition of limited space of claim 1, wherein the positioning column comprises a bolt, a follower penetrating through the bolt, a first wedge penetrating through the bolt, and a plurality of second wedges matched with the first wedges;

3. The repairing device for the flange threaded hole under the working condition of limited space as claimed in claim 2, wherein the first wedge block is arranged in a frustum shape, and a plurality of first inclined planes are arranged on the outer peripheral surface of the first wedge block around the central axis; the inner side of the second wedge block is provided with a second inclined surface corresponding to the first inclined surface, and the outer side of the second wedge block is provided with an arc-shaped surface matched with the inner wall of the eyelet.

4. The device for repairing the threaded hole of the flange under the condition of limited space of any one of claims 1 to 3, wherein countersunk structures are arranged on the sides, away from the connecting flange, of the first through hole and the second through hole, and the fixed end and the fastener are fixedly connected and the stud member and the fastener are fixedly connected and located in the countersunk structures.

5. The device for repairing the threaded hole of the flange under the working condition of limited space as claimed in any one of claims 1 to 3, wherein an auxiliary positioning plate is further arranged between the connecting flange and the mounting plate, and a hollow area is arranged on the auxiliary positioning plate corresponding to the eyelet; the auxiliary positioning plate is coaxially provided with a positioning hole corresponding to the threaded hole, and a guide hole corresponding to the threaded hole to be repaired is coaxially provided.

6. The device for repairing the threaded flange hole under the limited-space working condition as claimed in claim 5, wherein a protrusion is arranged at the position of the eye hole, and a concave surface is arranged on one side, facing the eye hole, of the auxiliary positioning plate, and corresponds to the protrusion.

7. The device of claim 5, wherein a guide block is further arranged corresponding to the guide hole, and the guide block is detachably mounted on the auxiliary positioning plate.

8. The device of claim 7, wherein a clamping groove is formed in the maintenance machining position corresponding to the guide block, and the guide block is clamped in the clamping groove.

9. The use method of the device for repairing the threaded hole of the flange under the limited space working condition is suitable for the device for repairing the threaded hole of the flange under the limited space working condition, which is disclosed by any one of claims 1 to 8, and is characterized by comprising the following steps of:

10. The use method of the device for repairing the threaded hole of the flange under the working condition of limited space according to claim 9, wherein when the mounting plate is mounted, an auxiliary positioning plate is arranged between the connecting flange and the mounting plate, a positioning hole is coaxially arranged on the auxiliary positioning plate corresponding to the threaded hole, and the stud member is arranged in the positioning hole in a penetrating manner;