A pressure vessel top cover and internal component guide device and hoisting method

Abstract

The present invention provides a pressure vessel top cover and a guide device for a pile internal component, comprising a telescopic head, a set screw and a guide rod. The telescopic head is connected to the guide rod through a set screw. The telescopic head is provided with a long groove, a short groove, a wrench hole, a set bolt hole on the telescopic head and a set bolt hole under the telescopic head. The guide rod is provided with a long tapered column, a short tapered column, a set bolt hole under the guide rod and a set bolt hole on the guide rod. The guide device has two states: 1) original state: the set screw passes through the set bolt hole on the telescopic head and the set bolt hole on the guide rod at the same time, thereby connecting the guide rod with the telescopic head. 2) extended state: the set screw passes through the set bolt hole under the guide rod and the set screw hole under the telescopic head at the same time, thereby connecting the guide rod with the telescopic head. The present invention also provides a method for hoisting a pressure vessel top cover and a pile internal component. The present invention simplifies the maintenance process, shortens the hoisting period of the pressure vessel switch cover, and reduces the radiation dose of personnel.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical maintenance, and in particular relates to a pressure vessel top cover and a pile internal component guide device and a hoisting method. Background Art

[0002] The lifting of the pressure vessel top cover and internal components is the main line of work in the overhaul of nuclear power plant pressure vessels. In order to ensure that the lifting process of large parts effectively avoids contact with various easy-to-touch points that may cause damage to equipment, two lengths of guide columns are currently configured in the core maintenance to lift the upper internal components, lower internal components, and reactor pressure vessel top cover assemblies.

[0003] The design length of the long guide column is 9500mm, and the design length of the short guide column is 5465mm. The short guide column is required when lifting the top cover, and the long guide column is required when lifting the lower pile internal components. The entire maintenance process requires repeated replacement of the long and short guide columns three times, which consumes a lot of time and manpower and material costs.

[0004] Therefore, it is urgent to design an improved lifting device and lifting method that can be used for the lifting of the top cover and the lower reactor internal components at the same time, without the need for repeated replacement, thereby shortening the main line maintenance period and reducing the radiation dose of the workers. Summary of the invention

[0005] The main purpose of the present invention is to provide a pressure vessel top cover and internal component guide device and hoisting method, which can be used for hoisting the top cover and lower internal components at the same time without repeated replacement.

[0006] The technical solution adopted by the present invention is:

[0007] A pressure vessel top cover and a guide device for internal components of a pile, comprising a lifting lug, a telescopic head, a set screw and a guide rod.

[0008] The lifting lug is placed on the top of the pressure vessel cover and the guide device of the internal component, and is threadedly connected to the telescopic head. The telescopic head is connected to the guide rod through a set screw.

[0009] The top of the telescopic head is the upper end face, and the bottom is the lower end face. The distance between the upper end face and the lower end face of the telescopic head is 950mm.

[0010] The telescopic head is provided with a long groove and a short groove, wherein the long groove is 700 mm away from the lower end surface of the telescopic head, and the short groove is 200 mm away from the lower end surface of the telescopic head.

[0011] The expansion head is also provided with a wrench hole, a tightening bolt hole on the expansion head and a tightening bolt hole on the expansion head. The wrench hole is 80mm away from the upper end face of the expansion head; the tightening bolt hole on the expansion head is 150mm away from the upper end face of the expansion head; the tightening bolt hole on the expansion head is 700mm away from the upper end face of the expansion head.

[0012] The set screw passes through the set bolt hole under the telescopic head and is connected with the guide rod.

[0013] The top of the guide rod is the upper end face, the bottom is the lower end face, the lower reference surface of the guide rod is close to the lower end face, and the lower reference surface of the guide rod is 850mm away from the upper end face.

[0014] The guide rod is also provided with a long tapered column and a short tapered column. The distance between the top surface of the long tapered column and the lower reference surface of the guide rod is 700 mm, and the distance between the top surface of the short tapered column and the lower reference surface of the guide rod is 200 mm.

[0015] The guide rod is also provided with a lower fixing bolt hole of the guide rod and an upper fixing bolt hole of the guide rod, wherein the distance between the lower fixing bolt hole of the guide rod and the lower reference surface of the guide rod is 750mm, and the distance between the upper fixing bolt hole of the guide rod and the lower reference surface of the guide rod is 800mm.

[0016] Furthermore, the pressure vessel top cover and the internal component guide device are also provided with a guide rod wrench, which is used to pull the telescopic head to rotate horizontally after lifting the telescopic head.

[0017] The guide rod spanner is 400 mm long and 20 mm in diameter. The guide rod spanner matches the size of the spanner hole. The guide rod spanner is inserted into the spanner hole.

[0018] The nominal diameters of the tightening bolt holes on the expansion head, the tightening bolt holes under the expansion head, the tightening bolt holes under the guide rod and the tightening bolt holes on the guide rod are all 22mm.

[0019] The specification of the set screw is M20×50.

[0020] The pressure vessel top cover and the internal component guide device have two states:

[0021] 1. Original state: The set screw passes through the set bolt hole on the telescopic head and the set bolt hole on the guide rod at the same time, thereby connecting the guide rod to the telescopic head.

[0022] 2. Extension state: The set screw passes through the set bolt hole under the guide rod and the set screw hole under the telescopic head at the same time, thereby connecting the guide rod and the telescopic head.

[0023] The present invention also provides a method for hoisting a pressure vessel top cover and a pile internal component, comprising the following steps:

[0024] (1) Step 1: When hoisting the reactor top cover assembly, use the original pressure vessel top cover and the guide device for the internal components:

[0025] a) Check to ensure that the short groove of the telescopic head fits snugly with the short tapered column of the guide rod;

[0026] b) Check to ensure that the set screws have been fully screwed into the set bolt holes on the telescopic head and the set bolt holes on the guide rod.

[0027] (2) Step 2: Hoist the upper internals and continue to use the original pressure vessel top cover and internals guide device;

[0028] (3) Step 3: Hoisting the lower internals Using the extended pressure vessel top cover and internals guide device:

[0029] a) Remove the set screws;

[0030] b) Lift the lifting lugs so that the lower end surface of the telescopic head is 20-130mm higher than the plane where the long conical column of the guide rod is located;

[0031] c) Insert the wrench into the wrench hole of the telescopic head and rotate it 45° clockwise or counterclockwise horizontally;

[0032] d) Lower the lifting lugs so that the short groove of the telescopic head fits into the long tapered column of the guide rod;

[0033] e) Install the set screws to fix the set bolt holes under the telescopic head with the set bolt holes under the guide rod.

[0034] (4) Step 4: Reinstall the lower internals and continue to use the extended pressure vessel cover and internals guide device:

[0035] a) Check to ensure that the short groove of the telescopic head fits snugly into the long tapered column of the guide rod;

[0036] b) Ensure that the set screws are fully screwed into the set bolt holes under the telescopic head and the set bolt holes under the guide rod.

[0037] (5) Step 5: Reinstall the upper internals using the original pressure vessel top cover and internals guide device:

[0038] a) Remove the set screws;

[0039] b) Lift the lifting lugs so that the lower end surface of the telescopic head is 20-130mm higher than the plane where the long conical column of the guide rod is located;

[0040] c) Use the guide rod wrench to insert into the wrench hole of the telescopic head, and rotate the wrench 45° clockwise or counterclockwise horizontally;

[0041] d) Drop the lifting lugs so that the short groove of the telescopic head fits with the short tapered column of the guide rod, and the long groove of the telescopic head fits with the long tapered column of the guide rod;

[0042] e) Install the set screws to fix the set bolt holes on the telescopic head and the set bolt holes on the guide rod.

[0043] (6) Step 6: Reinstall the pressure vessel top cover assembly and continue to use the original pressure vessel top cover and internal component guide device:

[0044] a) Check to ensure that the short groove of the telescopic head fits snugly with the short tapered column of the guide rod;

[0045] b) Check to ensure that the long groove of the telescopic head fits snugly with the long tapered column of the guide rod;

[0046] Check to ensure that the set screws are fully screwed into the set bolt holes on the telescopic head and the set bolt holes on the guide rod.

[0047] The beneficial effects achieved by the present invention are:

[0048] It avoids the use of lifting equipment for transportation and repeated lifting in and out during the replacement of long and short guide columns under different working conditions, simplifies the maintenance workflow, shortens the lifting period for opening and closing the pressure vessel cover, and reduces the radiation dose to personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the structure of the pressure vessel top cover and the guide device of the internal components in the extended state;

[0050] Figure 2 It is a schematic diagram of the original structure of the pressure vessel top cover and the guide device of the internal components;

[0051] Figure 3 It is a schematic diagram of the cross-sectional structure in the AA direction.

[0052] Among them: 1 is a lifting ear; 2 is a guide rod wrench; 3 is a telescopic head; 4 is a set screw; 5 is a guide rod; 6 is a short groove; 7 is a long groove; 8 is a set bolt hole under the telescopic head; 9 is a set bolt hole on the telescopic head; 10 is a wrench hole; 11 is a reference surface under the guide rod; 12 is a set bolt hole under the guide rod; 13 is a set bolt hole on the guide rod; 14 is a long tapered column; 15 is a short tapered column. DETAILED DESCRIPTION

[0053] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] like Figure 1-Figure 3 As shown, the present invention provides a pressure vessel top cover and internal component guide device, including a lifting lug 1, a telescopic head 3, a set screw 4 and a guide rod 5.

[0055] The lifting lug 1 is placed on the top of the pressure vessel cover and the guide device of the internal component, and is threadedly connected to the telescopic head 3. The telescopic head 3 is connected to the guide rod 5 through a set screw 4.

[0056] The top of the telescopic head 3 is the upper end face, and the bottom is the lower end face. The distance between the upper end face and the lower end face of the telescopic head 3 is 950 mm.

[0057] The telescopic head 3 is provided with a long groove 7 and a short groove 6. The long groove 7 is 700 mm away from the lower end surface of the telescopic head 3, and the short groove 6 is 200 mm away from the lower end surface of the telescopic head 3.

[0058] The telescopic head 3 is also provided with a wrench hole 10, a tightening bolt hole 9 on the telescopic head and a tightening bolt hole 8 under the telescopic head. The wrench hole 10 is 80 mm away from the upper end face of the telescopic head 3; the tightening bolt hole 9 on the telescopic head is 150 mm away from the upper end face of the telescopic head 3; the tightening bolt hole 8 under the telescopic head is 700 mm away from the upper end face of the telescopic head 3.

[0059] The top of the guide rod 5 is the upper end surface, and the bottom is the lower end surface. The lower reference surface 11 of the guide rod is close to the lower end surface, and the lower reference surface 11 of the guide rod is 850 mm away from the upper end surface.

[0060] The guide rod 5 is also provided with a long tapered column 14 and a short tapered column 15. The distance between the top surface of the long tapered column 14 and the lower reference surface 11 of the guide rod is 700 mm, and the distance between the top surface of the short tapered column 15 and the lower reference surface 11 of the guide rod is 200 mm.

[0061] The guide rod 5 is also provided with a lower guide rod fixing bolt hole 12 and an upper guide rod fixing bolt hole 13, wherein the lower guide rod fixing bolt hole 12 is 750 mm away from the lower guide rod reference surface 11, and the upper guide rod fixing bolt hole 13 is 800 mm away from the lower guide rod reference surface 11.

[0062] Furthermore, the pressure vessel top cover and the internal component guide device are also provided with a guide rod wrench 2, which is used to lift the telescopic head 3 and then drive the telescopic head 3 to rotate horizontally.

[0063] The guide rod spanner 2 has a length of 400 mm and a diameter of 20 mm. The guide rod spanner 2 matches the size of the spanner hole 10. The guide rod spanner 2 is inserted into the spanner hole 10.

[0064] The nominal diameters of the tightening bolt hole 9 on the telescopic head, the tightening bolt hole 8 under the telescopic head, the tightening bolt hole 12 under the guide rod and the tightening bolt hole 13 on the guide rod are all 22 mm.

[0065] The specification of the set screw 4 is M20×50.

[0066] The pressure vessel top cover and the internal component guide device have two states:

[0067] 1. Original state: The set screw 4 passes through the set bolt hole 9 on the telescopic head and the set bolt hole 13 on the guide rod at the same time, thereby connecting the guide rod 5 to the telescopic head 3.

[0068] 2. Elongated state: the set screw 4 passes through the lower set bolt hole 12 of the guide rod and the lower set bolt hole 8 of the telescopic head at the same time, thereby connecting the guide rod 5 with the telescopic head 3.

[0069] The present invention also provides a method for hoisting a pressure vessel top cover and a pile internal component, comprising the following steps:

[0070] Step 1: When hoisting the reactor cover assembly, use the original pressure vessel cover and the guide device for the internal components:

[0071] a) Check to ensure that the short groove 6 of the telescopic head 3 fits the short tapered column 15 of the guide rod 5;

[0072] b) Check to ensure that the set screw 4 has been completely screwed into the set bolt hole 9 on the telescopic head and the set bolt hole 13 on the guide rod.

[0073] Step 2: Hoist the upper internals and continue to use the pressure vessel top cover and internals guide device in their original state;

[0074] Step 3: Lifting the lower internals Using the extended pressure vessel top cover and internals guide device:

[0075] a) Remove the set screw 4;

[0076] b) lifting the lifting lug 1, so that the lower end surface of the telescopic head 3 is 20-130 mm higher than the plane where the long conical column 14 of the guide rod is located;

[0077] c) Use the guide rod wrench 2 to insert into the wrench hole 10 of the telescopic head 3, and rotate it horizontally clockwise or counterclockwise by 45°;

[0078] d) lowering the lifting lug 1 so that the short groove 6 of the telescopic head 3 fits into the long tapered column 14 of the guide rod 5;

[0079] e) Install the set screw 4 to fix the lower set bolt hole 8 of the telescopic head with the lower set bolt hole 12 of the guide rod.

[0080] Step 4: Reinstall the lower internals and continue to use the extended pressure vessel cover and internals guide device:

[0081] a) Check to ensure that the short groove 6 of the telescopic head 3 fits the long tapered column 14 of the guide rod 5;

[0082] b) Ensure that the set screw 4 has been completely screwed into the set bolt hole 8 under the telescopic head and the set bolt hole 12 under the guide rod.

[0083] Step 5: Reinstall the upper internals using the original pressure vessel top cover and internals guide device:

[0084] a) Remove the set screw 4;

[0085] b) Lift the lifting lug 1 so that the lower end surface of the telescopic head 3 is 20-130 mm higher than the plane where the long conical column 14 of the guide rod is located;

[0086] c) Use the guide rod wrench 2 to insert the wrench hole 10 of the telescopic head 3, and rotate the wrench 45° clockwise or counterclockwise horizontally;

[0087] d) lowering the lifting lug 1 so that the short groove 6 of the telescopic head 3 fits with the short tapered column 15 of the guide rod 5, and the long groove 7 of the telescopic head 3 fits with the long tapered column 14 of the guide rod 5;

[0088] e) Install the set screw 4 to fix the set bolt hole 9 on the telescopic head and the set bolt hole 13 on the guide rod.

[0089] Step 6: Reinstall the pressure vessel top cover assembly and continue to use the original pressure vessel top cover and internal component guide device:

[0090] a) Check to ensure that the short groove 6 of the telescopic head 3 fits the short tapered column 15 of the guide rod 5;

[0091] b) Check to ensure that the long groove 7 of the telescopic head 3 fits the long tapered column 14 of the guide rod 5;

[0092] Check to ensure that the set screw 4 has been completely screwed into the set bolt hole 9 on the telescopic head and the set bolt hole 13 on the guide rod.

[0093] The beneficial effects achieved by the present invention are:

[0094] It avoids the use of lifting equipment for transportation and repeated lifting in and out during the replacement of long and short guide columns under different working conditions, simplifies the maintenance workflow, shortens the lifting period for opening and closing the pressure vessel cover, and reduces the radiation dose to personnel.

Claims

1. A pressure vessel top cover and internal component guide device, characterized in that: The invention comprises a lifting lug (1), a telescopic head (3), a set screw (4) and a guide rod (5), wherein the lifting lug (1) is placed on the top of the pressure vessel top cover and the top of the guide device for the internal component of the pile, and is connected to the telescopic head (3) by a threaded connection, and the telescopic head (3) is connected to the guide rod (5) by the set screw (4); the top of the telescopic head (3) is the upper end face, and the bottom is the lower end face, and the distance between the upper end face and the lower end face of the telescopic head (3) is 950 mm. The telescopic head (3) is also provided with a long The telescopic head (3) is provided with a groove (7) and a short groove (6), wherein the long groove (7) is 700 mm away from the lower end surface of the telescopic head (3), and the short groove (6) is 200 mm away from the lower end surface of the telescopic head (3); the telescopic head (3) is further provided with a wrench hole (10), a tightening bolt hole (9) on the telescopic head, and a tightening bolt hole (8) under the telescopic head; wherein the wrench hole (10) is 80 mm away from the upper end surface of the telescopic head (3); the tightening bolt hole (9) on the telescopic head and the upper end surface of the telescopic head (3) are in contact with each other. The distance between the upper end face and the lower end face of the telescopic head (3) is 150 mm; the distance between the tightening bolt hole (8) at the lower end face of the telescopic head (3) and the upper end face is 700 mm; the top of the guide rod (5) is the upper end face, the bottom is the lower end face, the lower reference face (11) of the guide rod is close to the lower end face, and the lower reference face (11) of the guide rod is 850 mm away from the upper end face; the guide rod (5) is also provided with a long conical column (14) and a short conical column (15), and the top face of the long conical column (14) is 100 mm away from the lower reference face (11) of the guide rod The distance between the top surface of the short conical column (15) and the lower reference surface (11) of the guide rod is 700 mm, and the distance between the top surface of the short conical column (15) and the lower reference surface (11) of the guide rod is 200 mm; the guide rod (5) is further provided with a lower guide rod fixing bolt hole (12) and an upper guide rod fixing bolt hole (13), wherein the distance between the lower guide rod fixing bolt hole (12) and the lower reference surface (11) of the guide rod is 750 mm, and the distance between the upper guide rod fixing bolt hole (13) and the lower reference surface (11) of the guide rod is 800 mm; The pressure vessel top cover and the in-core component guide device have two states: 1) an original state: the set screw (4) simultaneously passes through the set bolt hole (9) on the telescopic head and the set bolt hole (13) on the guide rod, thereby connecting the guide rod (5) to the telescopic head (3); 2) an extended state: the set screw (4) simultaneously passes through the set bolt hole (12) under the guide rod and the set bolt hole (8) under the telescopic head, thereby connecting the guide rod (5) to the telescopic head (3).

2. The pressure vessel top cover and internal component guide device according to claim 1, characterized in that: The pressure vessel top cover and the internal component guide device are also provided with a guide rod wrench (2). The guide rod wrench (2) has a length of 400 mm and a diameter of 20 mm. The guide rod wrench (2) matches the size of the wrench hole (10), and the guide rod wrench (2) is inserted into the wrench hole (10).

3. The pressure vessel top cover and internal component guide device according to claim 2, characterized in that: The nominal diameters of the tightening bolt hole (9) on the telescopic head, the tightening bolt hole (8) below the telescopic head, the tightening bolt hole (12) below the guide rod, and the tightening bolt hole (13) on the guide rod are all 22 mm; the specification of the tightening screw (4) is M20×50.

4. A method for hoisting a pressure vessel top cover and a pile internal component using the pressure vessel top cover and pile internal component guide device as claimed in claim 3, characterized in that: The following steps are involved: (1) Step 1: When hoisting the reactor top cover assembly, use the original pressure vessel top cover and the guide device for the internal components: a) Check to ensure that the short groove (6) of the telescopic head (3) fits snugly with the short tapered column (15) of the guide rod (5); b) Check to ensure that the set screw (4) has been fully screwed into the set screw hole (9) on the telescopic head and the set screw hole (13) on the guide rod; (2) Step 2: Hoist the upper internals and continue to use the original pressure vessel top cover and internals guide device; (3) Step 3: Lifting the lower internals Using the extended pressure vessel top cover and internals guide device: a) Remove the set screw (4); b) lifting the lifting lug (1) so that the lower end surface of the telescopic head (3) is 20-130 mm higher than the plane where the long conical column (14) of the guide rod (5) is located; c) Use the guide rod wrench (2) to insert into the wrench hole (10) of the telescopic head (3), and rotate it 45° clockwise or counterclockwise horizontally; d) lowering the lifting lug (1) so that the short groove (6) of the telescopic head (3) fits into the long tapered column (14) of the guide rod (5); e) Install the set screw (4) to fix the set screw hole (8) under the telescopic head with the set screw hole (12) under the guide rod; (4) Step 4: Reinstall the lower internals and continue to use the extended pressure vessel cover and internals guide device: a) Check to ensure that the short groove (6) of the telescopic head (3) fits snugly with the long tapered column (14) of the guide rod (5); b) Ensure that the set screw (4) has been fully screwed into the set screw hole (8) under the telescopic head and the set screw hole (12) under the guide rod; (5) Step 5: Reinstall the upper internals using the original pressure vessel top cover and internals guide device: a) Remove the set screw (4); b) lifting the lifting lug (1) so that the lower end surface of the telescopic head (3) is 20-130 mm higher than the plane where the long conical column (14) of the guide rod is located; c) Use the guide rod wrench (2) to insert the wrench hole (10) of the telescopic head (3), and rotate the wrench 45° clockwise or counterclockwise horizontally; d) lowering the lifting lug (1) so that the short groove (6) of the telescopic head (3) fits with the short conical column (15) of the guide rod (5), and the long groove (7) of the telescopic head (3) fits with the long conical column (14) of the guide rod (5); e) Install the set screw (4) to fix the set bolt hole (9) on the telescopic head and the set bolt hole (13) on the guide rod; (6) Step 6: Reinstall the pressure vessel top cover assembly and continue to use the original pressure vessel top cover and internal component guide device: a) Check to ensure that the short groove (6) of the telescopic head (3) fits snugly with the short tapered column (15) of the guide rod (5); b) Check to ensure that the long groove (7) of the telescopic head (3) fits the long tapered column (14) of the guide rod (5); Check to make sure that the set screw (4) is fully screwed into the set screw hole (9) on the telescopic head and the set screw hole (13) on the guide rod.

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