Special tool for mounting and dismounting inner inserting plate of evaporator applied to nuclear power station

Abstract

The utility model relates to a special tool for mounting and dismounting an inner inserting plate of an evaporator applied to a nuclear power station, which is used for mounting and dismounting the inner inserting plate of the evaporator and comprises a bolt fixing base, a hinge, a fixed guide rod and a fixed claw, one end of the hinge is connected with the bolt fixing base; one end of the fixed guide rod is connected with the other end of the hinge; a threaded section is arranged at the other end of the fixed guide rod; the fixed guide rod is connected with a fixed claw; the fixed claw is connected with the threaded section of the fixed guide rod; the fixing claws abut against the evaporator inner inserting plate. Compared with the prior art, the special tool for mounting and dismounting the inner inserting plate of the evaporator applied to the nuclear power station can solve the problems that the inner inserting plate of a steam generator is difficult to dismount and mount, easily causes equipment and personal injury, is difficult to dismount and the like, easily forms standard maintenance specifications, and easily implements operation procedures.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power evaporator inspection tools, in particular to a special tool for installing and disassembling an inner plug plate in a nuclear power plant evaporator. Background Technique

[0002] An evaporator is provided in the unit of a nuclear power plant. Each evaporator has primary and secondary side manhole doors, and the structure is in two layers: the first layer is an inner plug plate, which is fixed inside the manhole seat by multiple (usually 3 - 6) (φ0.5 inch) hexagon socket head cap screws; the second layer is a manhole cover plate, which is fixed outside the manhole seat by multiple (usually 12 - 24) (φ1.875 inch) hexagon bolts. The evaporator is disassembled and cooperated with the in-service inspection work every 1.5 years. During the overhaul period, as an important nuclear-grade equipment, the evaporator must be overhauled and the primary and secondary side manhole doors must be removed during each fuel cycle to conduct in-service inspection on the internal heat transfer tubes of the evaporator. Traditional disassembly method: Two people cooperate to wear radiation protection supplies and use a hexagon socket head cap wrench for disassembly. The disadvantage of this method is that since the personnel need to wear 2 layers of protective gloves and there is no fixing measure outside the inner plug plate, it is easy to cause the inner plug plate to fall off and damage the sealing surface, seriously affecting the equipment sealing quality, and the operation is laborious, increasing the difficulty of overhaul during maintenance. At the same time, the radioactive dose of the overhaul equipment is relatively high, increasing the irradiation dose of the maintenance personnel.

[0003] Currently, during the process of removing the inner plug plate of the primary side cold leg manhole of the evaporator during overhaul, due to possible mistakes in personnel cooperation and the heavy equipment, the sealing surface of the inner plug plate may be damaged.

[0004] Therefore, how to standardize the behavior of maintenance personnel during the disassembly and overhaul of the primary and secondary manhole inner plug plates of the evaporator and effectively disassemble the inner plug plate to prevent damage to the equipment sealing surface is an urgent problem to be solved. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the defects existing in the above-mentioned prior art and provide a special tool for installing and disassembling an inner plug plate of an evaporator applied in a nuclear power plant. By setting a bolt fixing base, a hinge, a fixed guide rod, and a fixed claw, it can solve the problems of difficult disassembly and installation of the inner plug plate of the steam generator, easy cause of equipment and personal injuries, difficult disassembly, etc., easily form a standard maintenance specification, and easily implement it into the operation procedure. The purpose of the utility model can be realized by the following technical solutions:

[0006] The purpose of the present utility model is to provide a special tool for the installation and disassembly of the inner insert plate in an evaporator applied in a nuclear power plant, which is used for the installation and disassembly of the inner insert plate of the evaporator. The special tool for installation and disassembly includes a bolt fixing base, a hinge, a fixed guide rod, and a fixed claw; one end of the hinge is connected to the bolt fixing base; one end of the fixed guide rod is connected to the other end of the hinge; the other end of the fixed guide rod is provided with a threaded section; a fixed claw is connected to the fixed guide rod; the fixed claw is connected to the threaded section of the fixed guide rod; the fixed claw abuts against the inner insert plate of the evaporator.

[0007] Further, a plurality of fixed guide rods are provided, and a plurality of fixed claws correspond to the fixed guide rods one by one; the plurality of fixed claws respectively abut against the inner insert plate of the evaporator along the circumferential direction of the inner insert plate of the evaporator to fix the inner insert plate of the evaporator.

[0008] Further, 3 fixed guide rods are provided, and 3 fixed claws correspond to the fixed guide rods one by one; the 3 fixed guide rods are arranged in the same plane, and the angle between two adjacent fixed guide rods is 120°; the 3 fixed claws respectively abut against the inner insert plate of the evaporator along the circumferential direction of the inner insert plate of the evaporator to fix the inner insert plate of the evaporator.

[0009] Further, the fixed claw includes a first limiting portion and a second limiting portion connected to the first limiting portion; an internal threaded hole is formed in the first limiting portion to be connected to the threaded section of the fixed guide rod through the internal threaded hole.

[0010] Further, the second limiting portion is in the shape of a circular sheet, and the first limiting portion is in the shape of a cylinder.

[0011] Further, the diameter of the second limiting portion is larger than the diameter of the first limiting portion; the first limiting portion is used for limiting the outer circular circumference of the inner insert plate of the evaporator, and the first limiting portion is used for limiting the circular surface of the inner insert plate of the evaporator.

[0012] Further, the hinge includes a first connecting portion, a connecting portion, and a second connecting portion; the first connecting portion and the second connecting portion are respectively arranged at both ends of the connecting portion; the fixed guide rod is connected to the first connecting portion; the bolt fixing base is connected to the second connecting portion.

[0013] Further, the first connecting portion is in the shape of a cylinder, and the fixed guide rod is connected to the side surface of the cylindrical first connecting portion; the second connecting portion includes two ear plates, and a pin shaft is connected between the ear plates to be hinged to the bolt fixing base.

[0014] Further, the bolt fixing base includes a base plate, a manhole connection bolt, and a connection plate; the bolt fixing base is connected to the evaporator manhole seat; the manhole connection bolt is connected to the base plate; the manhole connection bolt is used to connect the base plate of the bolt fixing base and the manhole of the evaporator manhole seat; the connection plate is connected to the base plate; the connection plate is connected to the hinge.

[0015] Further, to avoid the problem of rusting during long-term storage and meet the requirements of foreign object prevention and nuclear cleanliness when used in nuclear power plants, this tool is made of stainless steel, with excellent mechanical properties, ensuring good structural integrity and load-bearing capacity of the tool. At the same time, it protects the sealing surface of the inner insert in the evaporator from being damaged. The bolt fixing base is a stainless steel bolt fixing base; the hinge is a stainless steel hinge; the fixed guide rod is a stainless steel fixed guide rod; the fixed claw is a stainless steel fixed claw.

[0016] Further, the evaporator includes an evaporator manhole seat and an evaporator inner insert connected to the evaporator manhole seat; there is an evaporator opening on the evaporator manhole seat; the evaporator inner insert covers the upper part of the evaporator opening, and the evaporator inner insert is connected to the evaporator manhole seat by screws; there are multiple manholes arranged circumferentially outside the evaporator opening.

[0017] Further, the number of the manholes is usually 12 - 24, and the number of the manholes does not affect the use of the special tool for installing and disassembling the evaporator inner insert in the nuclear power plant application of this application.

[0018] Further, the length of the fixed guide rod is 300 mm.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1) A special tool for installing and disassembling the evaporator inner insert in a nuclear power plant application provided by this technical solution can solve the problems of difficult disassembly and installation of the inner insert in the steam generator, which are prone to cause equipment and personal injuries and difficult disassembly, etc. It is easy to form a standard maintenance specification and easy to implement into the operation procedure.

[0021] 2) A special tool for installing and disassembling the evaporator inner insert in a nuclear power plant application provided by this technical solution is convenient for installation and disassembly and is relatively stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an installation schematic diagram of the special tool for installing and disassembling the evaporator inner insert in a nuclear power plant application in the embodiment of the utility model.

[0023] Figure 2Schematic diagram of the installation of the inner insert plate of the evaporator applied in a nuclear power plant in the embodiment of the present utility model, showing the installation diagram of the opening of the lower evaporator.

[0024] Figure 3 Schematic three-dimensional structure of the special tool for installing and disassembling the inner insert plate of the evaporator applied in a nuclear power plant in the embodiment of the present utility model Figure 1 (For a clearer display of the structure, the inner insert plate of the evaporator is set to be transparently displayed, which does not mean that the inner insert plate of the evaporator itself is made of a transparent material).

[0025] Figure 4 Schematic three-dimensional structure of the special tool for installing and disassembling the inner insert plate of the evaporator applied in a nuclear power plant in the embodiment of the present utility model Figure 2 .

[0026] Figure 5 Schematic diagram of the cooperation between the fixed claw of the special tool for installing and disassembling the inner insert plate of the evaporator applied in a nuclear power plant in the embodiment of the present utility model and the positive direction of the inner insert plate of the evaporator (the complete structure of the inner insert plate of the evaporator is not shown, which does not affect the understanding of the cooperation part).

[0027] Wherein:

[0028] 1. Bolt fixed base; 1-1. Substrate; 1-2. Manhole connection bolt; 1-3. Connecting plate; 2. Hinge; 2-1. First connecting part; 2-2. Connecting part; 2-3. Second connecting part; 3. Fixed guide rod; 3-1. Threaded section; 4. Fixed claw; 4-1. First limiting part; 4-2. Second limiting part; 4-3. Internal threaded hole; 5. Inner insert plate of evaporator; 6. Evaporator manhole seat; 6-1. Manhole; 6-2. Evaporator opening. Specific implementation mode

[0029] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Features such as component models, material names, and connection structures that are not clearly stated in the present technical solution are regarded as common technical features disclosed in the prior art.

[0030] In the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components; "up", "down", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] It should be noted that in the present utility model, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0032] The following will further elaborate on the content of the present utility model in conjunction with specific embodiments.

[0033] Embodiment

[0034] As Figures 1 to 5 shown, in this embodiment, a special tool for installing and disassembling an inner insert plate of an evaporator applied in a nuclear power plant is used for installing and disassembling the inner insert plate 5 of the evaporator. The special tool for installing and disassembling includes a bolt fixing base 1, a hinge 2, a fixed guide rod 3, and a fixed claw 4; one end of the hinge 2 is connected to the bolt fixing base 1; one end of the fixed guide rod 3 is connected to the other end of the hinge 2; the other end of the fixed guide rod 3 is provided with a threaded section 3-1; a fixed claw 4 is connected to the fixed guide rod 3; the fixed claw 4 is connected to the threaded section 3-1 of the fixed guide rod 3; the fixed claw 4 abuts against the inner insert plate 5 of the evaporator.

[0035] Three fixed guide rods 3 are provided, and three fixed claws 4 correspond to the fixed guide rods 3 one by one; the three fixed guide rods 3 are arranged in the same plane, and the angle between two adjacent fixed guide rods 3 is 120°; the three fixed claws 4 respectively abut against the inner insert plate 5 of the evaporator along the circumferential direction of the inner insert plate 5 of the evaporator to fix the inner insert plate 5 of the evaporator.

[0036] The fixed claw 4 includes a first limiting portion 4-1 and a second limiting portion 4-2 connected to the first limiting portion 4-1; an internal threaded hole 4-3 is formed in the first limiting portion 4-1 to be connected to the threaded section 3-1 of the fixed guide rod 3 through the internal threaded hole 4-3.

[0037] The second limiting portion 4-2 is in the shape of a circular sheet, and the first limiting portion 4-1 is a cylindrical opening.

[0038] The diameter of the second limiting part 4-2 is larger than that of the first limiting part 4-1; the first limiting part 4-1 is used to limit the outer circumference of the inner insert plate 5 of the evaporator, and the first limiting part 4-1 is used to limit the circular surface of the inner insert plate 5 of the evaporator.

[0039] The hinge 2 includes a first connecting part 2-1, a connecting part 2-2, and a second connecting part 2-3; the first connecting part 2-1 and the second connecting part 2-3 are respectively arranged at both ends of the connecting part 2-2; the fixed guide rod 3 is connected to the first connecting part 2-1; the bolt fixing base 1 is connected to the second connecting part 2-3.

[0040] The first connecting part 2-1 is cylindrical, and the fixed guide rod 3 is connected to the side surface of the cylindrical first connecting part 2-1; the second connecting part 2-3 includes two ear plates, and a pin shaft is connected between the ear plates to be hinged to the bolt fixing base 1.

[0041] The bolt fixing base 1 includes a base plate 1-1, a manhole connecting bolt 1-2, and a connecting plate 1-3; the bolt fixing base 1 is connected to the evaporator manhole seat 6; the manhole connecting bolt 1-2 is connected to the base plate 1-1; the manhole connecting bolt 1-2 is used to connect the base plate 1-1 of the bolt fixing base 1 and the manhole 6-1 of the evaporator manhole seat 6; the connecting plate 1-3 is connected to the base plate 1-1; the connecting plate 1-3 is connected to the hinge 2.

[0042] To avoid the problem of rusting during long-term storage and meet the requirements of foreign object prevention and nuclear cleanliness when used in a nuclear power plant, this tool is made of stainless steel, preferably 304 stainless steel, with excellent mechanical properties, ensuring good structural integrity and load-bearing capacity of the tool. At the same time, it protects the sealing surface of the inner insert plate 5 of the evaporator from being damaged. The bolt fixing base 1 is a stainless steel bolt fixing base; the hinge 2 is a stainless steel hinge; the fixed guide rod 3 is a stainless steel fixed guide rod; the fixed claw 4 is a stainless steel fixed claw.

[0043] The evaporator includes an evaporator manhole seat 6 and an inner insert plate 5 of the evaporator connected to the evaporator manhole seat 6; an evaporator opening 6-2 is provided on the evaporator manhole seat 6; the inner insert plate 5 of the evaporator covers above the evaporator opening 6-2, and the inner insert plate 5 of the evaporator is connected to the evaporator manhole seat 6 by screws or bolts; a plurality of manholes 6-1 are arranged circumferentially outside the evaporator opening 6-2.

[0044] Connection holes corresponding to two adjacent manholes 6-1 are provided on the base plate 1-1, and the connection holes are used for the manhole connecting bolts 1-2 to pass through, so that the manhole connecting bolts 1-2 can be connected to the manholes 6-1 after passing through the connection holes.

[0045] The fixed guide rod 3 is 300 mm long.

[0046] The working method of the special tool for installing and disassembling the inner insert plate in the evaporator applied in the above nuclear power plant includes the following steps:

[0047] 1. Fix the base 1 with bolts, and install the base plate 1-1 on the evaporator manhole seat 6 through the manhole connection bolt 1-2;

[0048] 2. Clamp the outer circumference of the inner insert plate 5 of the evaporator with the first limiting part 4-1 of the 3 fixing claws 4, and clamp the circular surface of the inner insert plate 5 of the evaporator with the second limiting part 4-2;

[0049] 3. In actual operation, one person can fix the special tool for installing and disassembling the inner insert plate in the evaporator applied in the nuclear power plant, and another person can slowly remove the screws (or bolts) used to fix the inner insert plate 5 on the inner insert plate 5 of the evaporator, so that the inner insert plate 5 is completely separated from the evaporator manhole seat 6, and the inner insert plate 5 is driven to leave the evaporator manhole seat 6 by the rotation of the hinge 2.

[0050] Observe the special tool for installing and disassembling the inner insert plate in the evaporator applied in the nuclear power plant during the operation process to determine that the disassembly requirements are met.

[0051] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present utility model according to the disclosure of the present utility model should be within the protection scope of the present utility model.

Claims

1. A special tool for installing and removing an evaporator inner plug-in board used in a nuclear power plant, used for installing and removing an evaporator inner plug-in board (5), characterized in that: The special installation and removal tool comprises a bolt fixing base (1), a hinge (2), a fixing guide rod (3), and a fixing claw (4); One end of the hinge (2) is connected to a bolt-fixed base (1); One end of the fixed guide rod (3) is connected to the other end of the hinge (2); The other end of the fixed guide rod (3) is provided with a threaded section (3-1); The fixed guide rod (3) is connected with a fixed claw (4); The fixing claw (4) is connected to the threaded section (3-1) of the fixing guide rod (3); The fixing claw (4) abuts against the evaporator inner insert plate (5).

2. The special tool for installing and removing the evaporator inner plug-in board used in a nuclear power plant according to claim 1, characterized in that: A plurality of fixed guide rods (3) are provided, and a plurality of fixed claws (4) correspond one to one with the fixed guide rods (3); A plurality of fixing claws (4) are respectively in contact with the evaporator inner insert plate (5) along the circumference of the evaporator inner insert plate (5) to fix the evaporator inner insert plate (5).

3. The special tool for installing and removing the evaporator inner plug-in board used in a nuclear power plant according to claim 2, characterized in that: Three fixed guide rods (3) are provided, and the three fixed claws (4) correspond to the fixed guide rods (3) one by one; The three fixed guide rods (3) are arranged in the same plane, and the angle between two adjacent fixed guide rods (3) is 120°; The three fixing claws (4) are respectively in contact with the evaporator inner insert plate (5) along the circumference of the evaporator inner insert plate (5) to fix the evaporator inner insert plate (5).

4. The special tool for installing and removing the evaporator inner plug-in board used in a nuclear power plant according to claim 1, characterized in that: The fixing claw (4) comprises a first limiting portion (4-1) and a second limiting portion (4-2) connected to the first limiting portion (4-1); An internal thread hole (4-3) is formed on the first limiting portion (4-1) so as to be connected to the threaded section (3-1) of the fixed guide rod (3) through the internal thread hole (4-3).

5. The special tool for installing and removing the evaporator inner plug-in board used in a nuclear power plant according to claim 4, characterized in that: The diameter of the second limiting portion (4-2) is greater than the diameter of the first limiting portion (4-1); The first limiting portion (4-1) is used to limit the outer circumference of the evaporator inner insert plate (5), and the first limiting portion (4-1) is used to limit the circular surface of the evaporator inner insert plate (5).

6. The special tool for installing and removing the evaporator inner plug-in board used in a nuclear power plant according to claim 1, characterized in that: The hinge (2) comprises a first connecting portion (2-1), a connecting portion (2-2), and a second connecting portion (2-3); The first connecting portion (2-1) and the second connecting portion (2-3) are respectively arranged at two ends of the connecting portion (2-2); The fixed guide rod (3) is connected to the first connecting portion (2-1); The bolt fixing base (1) is connected to the second connecting part (2-3).

7. A special tool for installing and removing the evaporator inner plug-in board used in a nuclear power plant according to claim 6, characterized in that: The first connecting portion (2-1) is cylindrical, and the fixed guide rod (3) is connected to the side surface of the cylindrical first connecting portion (2-1); The second connecting part (2-3) comprises two ear plates, and a pin is connected between the ear plates to be hinged with the bolt fixing base (1).

8. The special tool for installing and removing the inner plug board of the evaporator used in a nuclear power plant according to claim 1, characterized in that: The bolt fixing base (1) comprises a base plate (1-1), manhole connecting bolts (1-2), and a connecting plate (1-3); The bolt fixing base (1) is connected to the manhole seat (6) of the evaporator; The manhole connecting bolts (1-2) are connected to the base plate (1-1); The manhole connecting bolts (1-2) are used to connect the base plate (1-1) of the bolt fixing base (1) and the manhole (6-1) of the evaporator manhole seat (6); The connecting plate (1-3) is connected to the base plate (1-1); The connecting plate (1-3) is connected to the hinge (2).

9. The special tool for installing and removing the evaporator inner plug-in board used in a nuclear power plant according to claim 1, characterized in that: The bolt fixing base (1) is a stainless steel bolt fixing base; The hinge (2) is a stainless steel hinge; The fixed guide rod (3) is a stainless steel fixed guide rod; The fixing claw (4) is a stainless steel fixing claw.

10. The special tool for installing and removing the evaporator inner plug-in board used in a nuclear power plant according to claim 1, characterized in that: The evaporator comprises an evaporator manhole seat (6) and an evaporator inner plug-in plate (5) connected to the evaporator manhole seat (6); An evaporator opening (6-2) is provided on the evaporator manhole seat (6); The evaporator inner insert plate (5) covers the top of the evaporator opening (6-2); A plurality of holes (6-1) are arranged in a circumferential direction outside the evaporator opening (6-2).

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