Disassembling and assembling tool for hand hole plug on secondary side of steam generator

Abstract

The utility model discloses a steam generator secondary side hand hole plug assembling and disassembling tool which comprises a main rod used for being inserted into a plug. The rotating handle is used for rotating the main rod, and the rotating handle is mounted at one end of the main rod; the compression limiting mechanism is used for compressing the plug, and the compression limiting mechanism is mounted on the main rod; the main rod is inserted into the plug, then the plug is compressed through the compression mechanism, and finally the main rod is rotated through the rotating handle, so that the plug can be pulled out from the secondary side hand hole of the steam generator, and the problems that the plug of the secondary side hand hole of the steam generator is difficult to disassemble and assemble and a heat transfer pipe is damaged are solved. And meanwhile, the working efficiency, safety and reliability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam generator technical field especially relates to a steam generator secondary side hand hole blockage dismounting tool. BACKGROUND

[0002] Nuclear power plant EPR unit one steam generator secondary side hand hole sealing blockage has eight, every round overhaul all opens the hand hole and carries out steam generator secondary side flushing, ITV inspection and foreign matter catching work, divides into three different specifications, and the size, compression force and distance from steam generator heat pipe of each specification are different, especially single layer coaming type and partition plate type hand hole sealing blockage size is long, compression spring is thick, and compression force is big, lead to blockage dismounting difficulty, high risk, require high to special dismounting tool.

[0003] The blockage dismounting special tool equipped by the original manufacturer is not only inconvenient to operate due to the design defects, but also one blockage dismounting special tool is consumed for every two steam generator hand hole blockages, so that the special tool equipped by the original manufacturer has been completely damaged before the overhaul. Therefore, the dismounting tool is independently reformed and optimized to fundamentally eliminate the use risk and defects of the blockage dismounting special tool. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to provide a steam generator secondary side hand hole blockage dismounting tool which is convenient and safe to operate and avoids the risk of bumping the heat pipe.

[0005] The utility model adopts the technical scheme that:

[0006] A steam generator secondary side hand hole blockage dismounting tool, comprising:

[0007] A main rod is used for inserting into the blockage.

[0008] A rotating handle is used for rotating the main rod, and the rotating handle is installed at one end of the main rod.

[0009] A compression limiting mechanism is used for compressing the blockage, and the compression limiting mechanism is installed on the main rod.

[0010] Further, in the steam generator secondary side hand hole blockage dismounting tool, preferably, the compression limiting mechanism comprises a pressing piece for limiting the blockage and a compression assembly installed on the main rod and moving towards the pressing piece to compress the blockage.

[0011] Further, in the steam generator secondary side hand hole blockage dismounting tool, preferably, the compression assembly comprises a sleeve mounted on the main rod and moving towards the abutting member to compress the blockage, and a pushing member mounted on the main rod and pushing the sleeve to move.

[0012] Further, in the steam generator secondary side hand hole blockage dismounting tool, preferably, the compression assembly further comprises a stroke limiting member limiting the stroke of the pushing member and limiting the insertion depth of the main rod into the blockage.

[0013] Further, in the steam generator secondary side hand hole blockage dismounting tool, preferably, the pushing member comprises a threaded cylinder screwed on the main rod and a rotating handle mounted on the outer wall of the threaded cylinder.

[0014] Further, in the steam generator secondary side hand hole blockage dismounting tool, preferably, the sleeve is provided with a baffle at each end thereof, and the baffles abut against the blockage and the pushing member.

[0015] Further, in the steam generator secondary side hand hole blockage dismounting tool, preferably, the abutting member is detachably connected, movably connected or fixedly connected to one end of the main rod.

[0016] Further, in the steam generator secondary side hand hole blockage dismounting tool, preferably, the main rod is further provided with a scale safety mechanism limiting the insertion depth of the main rod into the blockage.

[0017] Further, in the steam generator secondary side hand hole blockage dismounting tool, preferably, the scale installation mechanism comprises shallow scale mark lines and deep scale mark lines provided on the main rod to measure the insertion depth of the blockage.

[0018] Further, in the steam generator secondary side hand hole blockage dismounting tool, preferably, the main rod comprises a lead screw segment matched with the pushing member and an insertion segment inserted into the blockage, and one end of the insertion segment is in a semispherical structure.

[0019] The present application has the following beneficial effects: the main rod is inserted into the blockage, then the blockage is compressed by the compression mechanism, and finally the blockage is pulled out of the steam generator secondary side hand hole by rotating the handle to rotate the main rod, thereby solving the problem of dismounting the steam generator secondary side hand hole blockage and the risk of bumping the heat transfer pipe, and improving the work efficiency and safety and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below in combination with the drawings and embodiments, wherein:

[0021] Fig. 1is a first view angle structure schematic diagram of a steam generator secondary side hand hole block dismounting tool in some embodiments of the utility model;

[0022] Fig. 2 is a main view angle structure schematic diagram of a steam generator secondary side hand hole block dismounting tool in some embodiments of the utility model.

[0023] The label explanation in the schematic diagram is as follows:

[0024] 1, main rod, 11, screw rod section, 12, insertion section, 2, rotating handle, 3, abutting piece, 4, compression assembly, 41, sleeve, 411, baffle, 42, pushing piece, 421, threaded cylinder, 422, rotating handle, 43, stroke piece, 5, shallow scale mark line, 6, deep scale mark line. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, objectives and effects of the utility model, the specific implementation mode of the utility model will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or position relations indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or position relations shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the technical scheme, and do not indicate that the indicated device or element must have a particular direction, therefore, it cannot be understood as a limitation on the utility model.

[0026] It should also be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "setting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. When an element is referred to as "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there can be one or more intermediate elements. The terms "first", "second", "third" and the like are only for the convenience of describing the technical scheme, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly included one or more of the features. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0027] In the following description, specific details are set forth in order to provide a thorough understanding of the embodiments of the application. However, persons having ordinary skill in the art will readily understand that the application can be practiced without these specific details, or with an equivalent set of details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the application.

[0028] The technical solution adopted by the utility model to solve its technical problems is:

[0029] As Figs. 1-2 shown, some embodiments of the utility model disclose a steam generator secondary side hand hole blockage dismounting tool, the steam generator secondary side hand hole blockage dismounting tool includes main rod 1, rotating handle 2 and compression limiting mechanism, main rod 1 is used to insert into blockage;Rotating handle 2 for rotating main rod 1 is installed at one end of main rod 1;Compression limiting mechanism for compressing blockage is installed on main rod 1.

[0030] In some embodiments, the front end of main rod 1 is inserted into blockage, then the blockage is compressed by using compression limiting mechanism, then main rod 1 and blockage are rotated by rotating handle 2 at the end, so that blockage is separated from the limiting of steam generator secondary side hand hole, finally main rod 1 is pulled out to separate blockage from steam generator secondary side hand hole.

[0031] In some embodiments, rotating handle 2 is installed on main rod 1 at ninety degrees.

[0032] Compression limiting mechanism includes abutting member 3 for limiting blockage installed on main rod 1, compression assembly 4 for compressing blockage installed on main rod 1 and moving to the direction of abutting member 3.

[0033] In some embodiments, abutting member 3 is installed at the front end of main rod 1, abutting member 3 is perpendicular to main rod 1, main rod 1 is rotated a circle after passing through blockage, so that abutting member 3 abuts and limits the bottom of blockage, so that compression assembly 4 moves to the direction of abutting member 3, and blockage is compressed by the putting of compression assembly 4 to abutting member 3.

[0034] Abutting member 3 is detachably connected, movably connected or fixedly connected at one end of main rod 1.

[0035] In some embodiments, abutting member 3 is a pin, and the pin is welded at the front end of main rod 1, so that the pin falls into the inside of evaporator.

[0036] Compression assembly 4 includes sleeve 41 for compressing blockage installed on main rod 1 and moving to the direction of abutting member 3, and pushing member 42 for pushing sleeve 41 to move installed on main rod 1.

[0037] In some embodiments, the sleeve 41 is fitted over the outside of the main rod 1, and the operator moves the pusher 42 toward the clamping member 3. The pusher 42 moves against the sleeve 41 to compress the blockage.

[0038] In some embodiments, the pusher 42 may also be a cylinder, an electric guide rail, etc., and the sleeve 41 is pushed by mechanical equipment.

[0039] In some embodiments, the pusher 42 and the sleeve 41 are connected, and the pusher 42 and the sleeve 41 are integrally formed.

[0040] In some embodiments, the pusher 42 is threadedly mounted on the main rod 1, and the sleeve 41 is slidably mounted on the main rod 1. The main rod 1 is threadedly engaged with the pusher 42. Rotating the pusher 42 causes it to move on the main rod 1, thereby pushing the sleeve 41 to move.

[0041] The compression assembly 4 also includes a stroke limiter for the pusher 42 and a stroke member 43 for limiting the insertion depth of the main rod 1 into the plug.

[0042] In some embodiments, a travel member 43 is provided at the rear end of the main rod 1 to limit the pusher 42. The shape and size of the pusher 42 are larger than the secondary side hand hole or the plugged insertion hole. This limits the insertion distance of the main rod 1 and prevents the main rod 1 from extending too deep and hitting the heat transfer tube, thus damaging the heat transfer tube.

[0043] The pusher 42 includes a threaded cylinder 421 screwed onto the main rod 1 and a rotating handle 422 mounted on the outer wall of the threaded cylinder 421.

[0044] In some embodiments, threads are provided on the inner wall of the threaded cylinder 421 and on the outer wall of the main rod 1. Rotating the threaded cylinder 421 can move it forward and backward on the main rod 1 to push the sleeve 41 to move.

[0045] In some embodiments, three rotating handles 422 are provided. The three rotating handles 422 are inclinedly arranged on the outer wall of the threaded cylinder 421 and have an airplane wing structure, which facilitates the rotation by personnel.

[0046] Both ends of the sleeve 41 are respectively equipped with baffles 411 that abut against the blocking and pushing member 42.

[0047] In some embodiments, the shape and size of the baffle 411 are larger than that of the sleeve 41, which facilitates increasing the contact area between the sleeve 41 and the pusher 42 and the block.

[0048] like Fig. 1 As shown, the main rod 1 is also equipped with a scale safety mechanism that limits the insertion depth of the main rod 1 into the plug.

[0049] In some embodiments, the scale safety mechanism facilitates observation of the depth of insertion of the main rod 1 into the plug, when the depth of insertion of the main rod 1 into the plug reaches the scale safety mechanism, at this time, the insertion of the main rod 1 has reached the position and does not need to continue to extend. Reducing the need to measure the depth of insertion each time, reducing the working time, and improving the work efficiency.

[0050] The scale installation mechanism includes shallow scale mark lines 5 and deep scale mark lines 6 respectively arranged on the main rod 1 for measuring the depth of insertion of the plug.

[0051] In some embodiments, the shallow scale mark lines 5 are drawn at the front end of the main rod 1 at 150 mm, which is used for insertion of short plugs. The deep scale mark lines 6 are drawn at the front end of the main rod 1 at 220 mm, which is used for insertion of long plugs. The distance of the shallow scale mark lines 5 and the deep scale mark lines 6 from the main rod 1 is not limited, and can be determined according to the actual use range.

[0052] In some embodiments, an upper trigger sensor can also be arranged at the shallow scale mark lines 5 and the deep scale mark lines 6, when the depth of insertion reaches the trigger sensor, the trigger sensor will alarm to remind the worker.

[0053] In some embodiments, a fluorescent device or a light device can be arranged at the shallow scale mark lines 5 and the deep scale mark lines 6 to avoid darkness inside the steam generator, which is not convenient for observation.

[0054] As shown in Fig. 2 The main rod 1 includes a lead screw segment 11 matched with the pusher 42 and an insertion segment 12 inserted into the plug, and one end of the insertion segment 12 is in a semispherical fillet structure.

[0055] In some embodiments, the semispherical fillet structure avoids scratching the heat transfer pipe by the end of the main rod 1 after extending into the plug, which causes damage.

[0056] The secondary side hand hole plug dismounting tool of the steam generator will be further described below in combination with the use process.

[0057] In use, the front end of the main rod 1 passes through the plug along the insertion hole of the plug, when the depth of insertion of the main rod 1 reaches the shallow scale mark lines 5 or the deep scale mark lines 6, at this time, the insertion has reached the position, then the pusher 42 is rotated to compress the plug against the sleeve 41. After the compression is completed, the main rod 1 is rotated by the rotating handle 2, the main rod 1 drives the plug to rotate one circle, at this time, the plug loses the limit of the secondary side hand hole, and finally the main rod 1 is pulled to remove the plug from the secondary side hand hole of the steam generator.

[0058] It can be understood that the above embodiments only express the preferred embodiments of the utility model, the description is more specific and detailed, but it can not be understood as the limitation of the utility model patent scope; it should be pointed out that for ordinary skilled person in the art, the above technical features can be freely combined without departing from the concept of the utility model, and a number of modifications and improvements can be made, which belong to the protection scope of the utility model; therefore, any equivalent transformation and modification within the scope of the utility model patent claim should belong to the scope of the utility model patent claim.

Claims

1. A secondary side handhole plug dismounting tool for a steam generator, characterized by, The utility model relates to a kind of plug insertion depth limiting mechanism, including: Main rod, for inserting plug; Rotary handle, for rotating the rotary handle of the main rod is installed on one end of the main rod; And Compression limiting mechanism, for the compression of the plug The compression limiting mechanism is installed on the main rod.

2. The secondary side handhole plug removal tool of claim 1, wherein: The compression limiting mechanism includes the abutting member for limiting the plug installed on the main rod, the compression assembly for the compression of the plug is installed on the main rod and moves to the direction of the abutting member.

3. The secondary side handhole plug removal tool of claim 2, wherein: The compression assembly includes sleeve, which is installed on the main rod and moves to the direction of the abutting member to compress the plug, and pusher, which is installed on the main rod and pushes the sleeve to move.

4. The secondary side handhole plug removal tool of claim 3, wherein: The compression assembly further includes stroke limiting member for limiting the stroke of the pusher and depth limiting member for limiting the depth of the main rod inserted into the plug.

5. The secondary side handhole plug removal tool of claim 3, wherein: The pusher includes threaded cylinder screwed on the main rod and rotating handle installed on the outer wall of the threaded cylinder.

6. The secondary side handhole plug removal tool of claim 3, wherein: Both ends of the sleeve are respectively provided with baffle for abutting the plug and pusher.

7. The secondary side handhole plug removal tool of claim 2, wherein: The abutting member is detachably connected, movably connected or fixedly connected to one end of the main rod.

8. The secondary side handhole plug removal tool of claim 1, wherein: The main rod is further provided with scale safety mechanism for limiting the depth of the main rod inserted into the plug.

9. The secondary side handhole plug removal tool of claim 8, wherein: The scale installation mechanism includes shallow scale mark line and deep scale mark line respectively provided on the main rod for measuring the depth of the plug inserted into.

10. The secondary side handhole plug removal tool of claim 3, wherein: The main rod includes screw segment matched with the pusher and insertion segment inserted into the plug, and one end of the insertion segment is in hemispherical round corner structure.

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