Lifting and positioning device and assembly method for special-shaped thick-walled stainless steel head

Abstract

The present invention discloses a lifting and positioning device and an assembly method for a special-shaped thick-walled stainless steel head, wherein the lifting and positioning device comprises a hanger, a cushion block assembly and an adjustable pull rod; the lifting and positioning device of the present invention can prevent the flange surface of the head from being deformed by force and can achieve the purpose of adjusting the horizontality of the head during the lifting and lifting process; the head assembly method of the present invention can make the horizontality of the head and the coaxiality of the head and the lower supporting plate meet the requirements by adopting the lifting and positioning device and the guide member, thereby improving the assembly efficiency and assembly accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power, and in particular to a lifting and positioning device for a special-shaped thick-walled stainless steel head and an assembly method. Background Art

[0002] The head is an important component of a pressurized water reactor nuclear reactor. When in use, the head needs to be assembled on the lower support plate of the cylinder of the hanging basket of the internal components of the reactor. Therefore, the lifting and positioning device and installation method of the head have always been an important research direction.

[0003] Existing head lifting equipment or devices are mostly fixed and lifted by the head flange surface, so the flange is prone to deformation during lifting or assembly. In addition, during the lifting and installation process, the horizontality of the head and the coaxiality requirements of the connection holes between the head and the lower support plate cannot be met, which can easily cause the head and the lower support plate to get stuck, affecting the assembly accuracy and assembly efficiency.

[0004] Therefore, it is urgent to provide a lifting and positioning device and an assembly method for a special-shaped thick-walled stainless steel head to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problems and to provide a lifting and positioning device and an assembly method for a special-shaped thick-walled stainless steel head. The lifting and positioning device can realize the lifting of the head and ensure the horizontality of the head by means of a lifting frame, a plurality of pad block assemblies and an adjustable pull rod; the head assembly method of the present invention can make the horizontality of the head and the coaxiality of the head and the lower supporting plate meet the requirements by adopting the lifting and positioning device and the positioning part of the present invention, thereby improving the assembly efficiency.

[0006] In order to achieve the above-mentioned purpose, the lifting and positioning device and assembly method of the special-shaped thick-walled stainless steel head described in the present invention adopt the following technical solutions.

[0007] The present invention provides a lifting and positioning device for a special-shaped thick-walled stainless steel head, which is used for lifting the head. The head includes a plurality of first water flow holes. The lifting and positioning device includes: a hanger, which is arranged at a fixed position; a plurality of pad block assemblies, which are configured to be installed on the first water flow holes of the head and are used for connecting the head with the lifting and positioning device; and a plurality of adjustable pull rods, each of the plurality of adjustable pull rods is respectively connected to the lifting frame and one of the pad block assemblies; and the adjustable pull rods drive the head to be lifted.

[0008] Further, the pad block assembly includes: a first pad block and a second pad block, which respectively cooperate and abut with the relative areas of the inner side surface of the head and the outer side surface of the head; and a connecting piece, which passes through the first water flow hole of the head, and the two ends of the connecting piece are respectively connected to the first pad block and the second pad block; and the first pad block or the second pad block is connected to the adjustable pull rod.

[0009] Furthermore, outer dimensions of the first cushion block and the second cushion block are respectively larger than inner diameters of the first water flow holes.

[0010] Furthermore, a handle is provided on the first cushion block and / or the second cushion block, and the handle is used to adjust the positions of the first cushion block and the second cushion block.

[0011] Furthermore, the adjustable pull rod includes a lifting pull rod and a manual hoist, one end of the lifting pull rod is connected to the lifting frame through the manual hoist, and the other end of the lifting pull rod is connected to the cushion block assembly.

[0012] Furthermore, the lifting frame includes a cross frame and a plurality of vertical columns, wherein the cross frame and the vertical columns are substantially perpendicular and are installed on a device or a position through the vertical columns.

[0013] The present invention also provides a head assembly method for assembling the head and the lower support plate of the internal component, wherein the head comprises a plurality of first water flow holes and mounting holes, and the lower support plate comprises a second water flow hole and a centering ring hole, and the assembly method comprises the following steps:

[0014] S1. Provide a guide member and the lifting and positioning device;

[0015] S2. Arrangement and installation: Arrangement and installation of the end cap, the internal components, the lifting and positioning device and the guide member are completed, wherein: the internal components are arranged above the end cap, the lifting frame is arranged above the internal components, the cushion block assembly is installed on the first water flow hole of the end cap, the adjustable pull rod passes through the second water flow hole, and the adjustable pull rod is respectively connected to the lifting frame and the cushion block assembly, and the guide member is installed in the middle ring hole and passes toward the end cap;

[0016] S3, lifting and assembling: lifting the head until it is in contact with the lower support plate and completing the fastening of the head and the lower support plate through the mounting hole and the centering ring hole.

[0017] Further, in step S2, the head, the in-pile components, the lifting and positioning device, and the guide are arranged and installed in the following manner:

[0018] The step of placing the end cap and installing the cushion block assembly on the first water flow hole thereof;

[0019] The step of placing the in-pile components, wherein the in-pile components are placed above the head;

[0020] The step of installing the lifting frame, wherein the lifting frame is installed on a side of the lower support plate away from the end cap;

[0021] A step of installing the adjustable pull rod, wherein the adjustable pull rod passes through the second water flow hole of the lower support plate and is respectively connected to the lifting frame and the cushion block assembly; and

[0022] The step of installing the guide member, wherein the guide member is installed in the middle ring hole and passes through the side facing the head.

[0023] Furthermore, the arrangement and installation of the lifting frame, the column and the adjustable pull rod further comprises the following steps:

[0024] Before the step of installing the adjustable pull rod, a protective sleeve is installed in the second water flow hole of the lower support plate.

[0025] Further, the lifting and assembling step includes the following steps:

[0026] S31, lifting the head and allowing the guide member to enter the corresponding installation hole;

[0027] S32, continue to lift the end cap until the end cap abuts against the lower support plate; and

[0028] S33, removing the guide member and fixing it through the mounting hole and the centering ring hole.

[0029] The beneficial effects of the lifting and positioning device and the assembly method of the present invention are:

[0030] The lifting and positioning device described in the present invention can realize the lifting and lifting of the head through the joint action of a lifting frame, multiple pad block assemblies and an adjustable pull rod; the lifting and positioning device described in the present invention can avoid the problem of force deformation of the head flange surface by using the pad block assembly installed on the head as the force point of the lifting force; the lifting and positioning device described in the present invention can achieve the purpose of adjusting the horizontality of the head during the lifting process through the adjustable pull rod; the lifting and positioning device described in the present invention has a reasonable structure and layout, and can effectively improve the assembly accuracy.

[0031] By adopting the lifting and positioning device and installing the guide member on the lower support plate, the head installation method of the present invention can avoid flange surface deformation, continuously adjust the horizontality of the head during the assembly process, and make the coaxiality of the head and the lower support plate meet the assembly requirements, thereby improving assembly efficiency and assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0033] Figure 1 The figure is a schematic diagram of the arrangement of the lifting and positioning device of the special-shaped thick-walled stainless steel head, the head and the internal components of the pile according to the present invention.

[0034] Figure 2 for Figure 1 A magnified view of local details.

[0035] Figure 3 It is a schematic diagram of the lifting frame.

[0036] The reference numerals in the accompanying drawings are:

[0037] 10. Lifting frame;

[0038] 11. Horizontal frame;

[0039] 111, bracket;

[0040] 112. Reinforcement strips;

[0041] 12. Pillar;

[0042] 20. Adjustable pull rod;

[0043] 21. Lifting rod;

[0044] 22. Manual hoist;

[0045] 30. Pad assembly;

[0046] 31. The first pad;

[0047] 32. Second pad;

[0048] 33. Connectors;

[0049] 34. Handle;

[0050] 40. Head sealing;

[0051] 50. Lower support plate;

[0052] 51. Guide member;

[0053] 52. Protective cover;

[0054] 60. Storage rack;

[0055] 61. Increase the height of the support. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0060] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0061] Figure 1 The figure is a schematic diagram of the arrangement of the lifting and positioning device of the special-shaped thick-walled stainless steel head, the head and the internal components of the pile according to the present invention. Figure 2 for Figure 1 A magnified view of the local details. Figure 3 It is a schematic diagram of the lifting frame.

[0062] like Figure 1 As shown, the present invention provides a lifting and positioning device for a special-shaped thick-walled stainless steel head (hereinafter referred to as the lifting and positioning device), which can be used for lifting and lifting the head 40, wherein the head 40 includes a plurality of first water flow holes.

[0063] Please continue to refer to Figure 1 The lifting and positioning device for the special-shaped thick-walled stainless steel head of the present invention comprises a lifting frame 10, a plurality of adjustable tie rods 20 and a plurality of cushion block assemblies 30. The lifting frame 10 is arranged at a fixed position. The plurality of cushion block assemblies 30 are configured to be installed on the first water flow hole of the head 40 for connecting the head 40 and the lifting and positioning device. The adjustable tie rod 20 is respectively connected to the lifting frame 10 and a cushion block assembly 30, and the head 40 can be lifted by operating the adjustable tie rod 20.

[0064] It can be seen that the lifting and positioning device for the special-shaped thick-walled stainless steel head described in the present invention can avoid deformation of the flange surface of the head 40 by adopting the pad block assembly 30 that can be installed on the first water flow hole as the connection point of the head 40 and the point of application of the lifting force; in addition, by adopting the adjustable pull rod 20, the lifting and positioning device for the special-shaped thick-walled stainless steel head described in the present invention can adjust the horizontality of the head 40 during the lifting and lifting process of the head 40, so that the horizontality meets the assembly requirements of the head 40.

[0065] like Figure 1 and Figure 3 As shown, the lifting frame 10 is arranged at a fixed position. That is, the lifting frame 10 can fix the lifting and positioning device at a device or a position. In a specific implementation, the lifting frame 10 is mainly used to connect the adjustable pull rod 20 to ensure the overall rigidity of the lifting and positioning device.

[0066] Please continue to refer to Figure 1 and Figure 3 In this embodiment, the lifting frame 10 includes a cross frame 11 and a plurality of vertical poles 12, wherein the cross frame 11 is substantially perpendicular to the plurality of vertical poles 12 and is mounted on a fixed position or fixed device through the vertical poles 12.

[0067] like Figure 3 As shown, the horizontal frame 11 includes a "cross"-shaped bracket 111 and a reinforcement strip 112 connected between adjacent sides of the bracket 111. The vertical rod 12 is a vertical rod-shaped member.

[0068] In a specific implementation, the cross frame 11 is a welded part. The vertical rod 12 is connected to the lower support plate 50 and the cross frame 11 by bolts.

[0069] like Figure 1 and Figure 2 As shown, the plurality of pad block assemblies 30 are configured to be installed on the first water flow hole of the head 40 and used for connecting the head 40 and the lifting and positioning device. Specifically, the plurality of pad block assemblies 30 are used for the connection point between the lifting and positioning device and the head 40 and the lifting force application point.

[0070] like Figure 1 and Figure 2 As shown, each of the cushion block assemblies 30 includes a first cushion block 31 , a second cushion block 32 and a connecting member 33 .

[0071] like Figure 1 and Figure 2As shown, the first cushion block 31 and the second cushion block 32 respectively abut against the inner side surface of the head 40 and the outer side surface of the head 40. Specifically, the first cushion block 31 and the second cushion block 32 are respectively located at the inner and outer sides of the head 40 and are in contact with the head 40 through shape matching.

[0072] like Figure 1 and Figure 2 As shown, in this embodiment, the head 40 is a convex head. The first cushion block 31 and the second cushion block 32 respectively match and contact with the concave surface (corresponding to the inner side surface) and the convex surface (corresponding to the outer side surface) of the convex head.

[0073] like Figure 1 and Figure 2 As shown, the connecting member 33 passes through the first water flow hole of the head 40, and the two ends of the connecting member 33 are respectively connected to the first cushion block 31 and the second cushion block 32. That is, through the connecting member 33, the first cushion block 31 and the second cushion block 32 are respectively fixed to the two sides of the head 40, so that the cushion block assembly 30 is installed on the head 40.

[0074] Specifically, the outer dimensions of the first cushion block 31 and the second cushion block 32 are respectively larger than the inner diameter of the first water flow hole, so as to ensure the installation effect and stability of the cushion block assembly 30 on the head 40 .

[0075] In a specific implementation, the connecting member 33 may be a bolt. The bolt is threadedly connected to the first cushion block 31 and the second cushion block 32 respectively, so as to facilitate the disassembly and installation of the cushion block assembly 30.

[0076] Specifically, the lifting and positioning device further includes a plurality of buffer pads, which are arranged on the side of the first cushion block 31 and the second cushion block 32 facing the end cap 40 , and are used to prevent the surface of the end cap 40 from being damaged.

[0077] In a specific implementation, each of the buffer pads is matched with the shape of the sealing head 40 and the first cushion block 31 or the second cushion block 32 to ensure sufficient surface contact.

[0078] Specifically, a connecting screw hole is provided on the first cushion block 31 or the second cushion block 32, and the adjustable tie rod 20 is screwed to the first cushion block 31 or the second cushion block 32 through the connecting screw hole. In specific implementation, it can be set according to the assembly requirements of the head 40 and the internal components.

[0079] Specifically, a handle 34 is provided on the first cushion block 31 and the second cushion block 32, respectively, and the handle 34 is used to adjust the position of the first cushion block 31 and the second cushion block 32. Through the handle 34, the relative position of the first cushion block 31 or the second cushion block 32 and the connecting member 33 and the head 40 can be adjusted respectively to prevent uneven force on the inner and outer sides of the head 40 from causing surface damage.

[0080] like Figure 1 As shown, two ends of each adjustable tie rod 20 are respectively connected to the lifting frame 10 and a cushion block assembly 30, and the adjustable tie rod 20 can drive the sealing head 40 to lift.

[0081] like Figure 1 As shown, the adjustable tie rod 20 includes a lifting tie rod 21 and a manual hoist 22. One end of the lifting tie rod 21 is connected to the lifting frame 10 through the manual hoist 22, and the other end of the lifting tie rod 21 is connected to a cushion block assembly 30. The head 40 can be lifted or hoisted by operating the manual hoist 22; in addition, the level of the head 40 can be continuously adjusted during the lifting process through the manual hoist 22, so that the head 40 can be in contact with the bottom surface of the lower support plate 50.

[0082] In a specific implementation, the manual hoist 22 is connected to the lifting frame 10 via a lifting eye nut installed on the lifting frame 10 .

[0083] The present invention also provides a method for assembling a head, the method for assembling a head 40 with a lower support plate 50 of an internal component, wherein the head 40 includes a plurality of first water flow holes and mounting holes, and the lower support plate 50 includes a second water flow hole and a centering ring hole, and the method for assembling comprises the following steps:

[0084] S1, providing a guide member and any one of the above described lifting and positioning devices;

[0085] S2, arrangement and installation: completing the arrangement and installation of the head, the internal components, the lifting and positioning device and the guide member;

[0086] S3, lifting and assembling: lifting the head until it is in contact with the lower support plate and fixing it through the mounting hole and the centering ring hole.

[0087] like Figure 1As shown, in step S2, the arrangement structure of the head 40, the in-pile components, the lifting and positioning device and the guide member is as follows: the in-pile components are placed correspondingly above the head 40, the lifting frame 10 is arranged above the in-pile components, and the cushion block assembly 30 is installed on the first water flow hole of the head 40; the adjustable pull rod 20 passes through the second water flow hole of the lower support plate 50, and the adjustable pull rod 20 is respectively connected to the lifting frame 10 and the cushion block assembly 30, and the guide member 51 is installed in the middle ring hole and passes through toward the head 40.

[0088] Specifically, the head, the internal components, the lifting and positioning device and the guide are installed in the following way to realize the arrangement structure:

[0089] a. placing the end cap and installing the pad assembly on the first water flow hole;

[0090] b. a step of placing the in-pile components, wherein the in-pile components are placed above the end cap;

[0091] c. The step of installing the lifting frame, wherein the lifting frame is installed on a side of the lower support plate away from the end cap;

[0092] d. a step of installing the adjustable pull rod, wherein the adjustable pull rod passes through the second water flow hole of the lower support plate and is respectively connected to the lifting frame and the cushion block assembly; and

[0093] e. The step of installing the guide member, wherein the guide member is installed in the centering ring hole and passes through the side facing the head.

[0094] Specifically, the lower support plate 50 further includes a protective cover 52, and the above-mentioned installation method further includes the following steps: before step d, the protective cover is installed in the second water flow hole of the lower support plate, and the adjustable pull rod 20 passes through the protective cover. By installing the protective cover, the adjustable pull rod 20 or the lifting pull rod 21 can be prevented from damaging the second water flow hole of the lower support plate 50 during the lifting process.

[0095] In a specific implementation, the protective sleeve is made of a polyethylene sleeve.

[0096] Specifically, in step a, the sealing head 40 can be placed on a storage rack 60 , and correspondingly, the lower support plate 50 is placed on the heightened support 61 of the storage rack 60 .

[0097] In the step e, the guide member 51 may be a guide pin, and the guide pin may be threadedly connected to the centering ring hole of the head 40 to facilitate the removal and installation of the guide member 51 in subsequent steps.

[0098] In step S3, the lifting assembly is performed in the following manner:

[0099] S31, lifting the head and allowing the guide member to enter the corresponding installation hole;

[0100] S32, continue to lift the end cap until the end cap abuts against the lower support plate; and

[0101] S33, removing the guide member and fixing the head and the lower support plate through the mounting hole and the centering ring hole.

[0102] In the step S31, the sealing head 40 is slowly lifted, and the levelness of the sealing head 40 can be adjusted by the adjustable pull rod 20 to ensure that each of the guide members 51 can enter into its corresponding mounting hole.

[0103] In the step S33 , after the guide member 51 is removed, the fastening bolts may be installed to complete the assembly of the head 40 and the lower support plate 50 .

[0104] By adding the guide member 51 for guidance, the centering ring hole of the lower support plate 50 can be introduced into the corresponding mounting hole on the head 40, which can prevent the centering ring from getting stuck during the lifting process of the head 40, ensure the coaxiality of the head 40 and the lower support plate 50, and improve the assembly accuracy and transfer efficiency.

[0105] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0106] The above is a detailed introduction to the lifting and positioning device and assembly method of a special-shaped thick-walled stainless steel head provided in an embodiment of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical scheme and core idea of ​​the present invention. Ordinary technical personnel in this field should understand that they can still modify the technical schemes recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the present invention.

Claims

1. A lifting and positioning device for a special-shaped thick-walled stainless steel head, used for lifting a head (40), wherein the head (40) comprises a plurality of first water flow holes, characterized in that: The lifting and positioning device comprises: A hanger (10) is arranged at a fixed position; a plurality of cushion block assemblies (30) configured to be mounted on the first water flow hole of the sealing head and used for connecting the sealing head (40) with the lifting and positioning device; and A plurality of adjustable tie rods (20), each of the plurality of adjustable tie rods (20) being connected to the lifting frame (10) and a cushion block assembly (30) respectively; and the adjustable tie rods (20) drive the sealing head (40) to be lifted; The adjustable pull rod (20) comprises a lifting pull rod (21) and a manual hoist (22), one end of the lifting pull rod (21) is connected to the lifting frame (10) through the manual hoist (22), and the other end of the lifting pull rod (21) is connected to a cushion block assembly (30); The pad block assembly (30) includes: a first pad block (31) and a second pad block (32), which respectively cooperate and abut with the relative areas of the inner side surface of the head (40) and the outer side surface of the head (40); and a connecting member (33) which passes through the first water flow hole of the head (40), and the two ends of the connecting member (33) are respectively connected to the first pad block (31) and the second pad block (32); the first pad block (31) is connected to the adjustable pull rod (20) or the second pad block (32) is connected to the adjustable pull rod (20); and a handle (34) is provided on the first pad block (31) and / or the second pad block (32), and the handle (34) is used to adjust the positions of the first pad block (31) and the second pad block (32).

2. The lifting and positioning device according to claim 1, characterized in that: The outer dimensions of the first cushion block (31) and the second cushion block (32) are respectively larger than the inner diameter of the first water flow hole.

3. The lifting and positioning device according to claim 1, characterized in that: The lifting frame (10) comprises a cross frame (11) and a plurality of vertical columns (12); the cross frame (11) and the vertical columns (12) are substantially vertical and are installed at a fixed position via the vertical columns (12).

4. A head assembly method for assembling a head (40) and a lower support plate (50) of an internal component, wherein the head (40) comprises a mounting hole and a plurality of first water flow holes, and the lower support plate comprises a second water flow hole and a centering ring hole, characterized in that: The assembly method comprises the following steps: S1. Provide a guide member and the lifting and positioning device according to any one of claims 1 to 3; S2. Arrangement and installation: Arrangement and installation of the end cap, the in-pile component, the lifting and positioning device, and the guide member are completed, wherein: the in-pile component is arranged above the end cap, the lifting frame is arranged above the in-pile component, the cushion block assembly is installed on the first water flow hole of the end cap, the adjustable pull rod passes through the second water flow hole, and the adjustable pull rod is respectively connected to the lifting frame and the cushion block assembly, and the guide member is installed in the centering ring hole and passes toward the end cap; In step S2, the head, the internal components, the lifting and positioning device, and the guide are arranged and installed in the following manner: The step of placing the end cap and installing the cushion block assembly on the first water flow hole thereof; The step of placing the in-pile components, wherein the in-pile components are correspondingly placed above the head; The step of installing the lifting frame, wherein the lifting frame is installed on a side of the lower support plate away from the end cap; A step of installing the adjustable pull rod, wherein the adjustable pull rod passes through the second water flow hole of the lower support plate and is respectively connected to the lifting frame and the cushion block assembly; and The step of installing the guide member, wherein the guide member is installed in the centering ring hole and passes through the side facing the head; S3, lifting and assembling: lifting the head until it is in contact with the lower support plate and completing the fastening of the head and the lower support plate through the mounting hole and the centering ring hole.

5. The head assembly method according to claim 4, characterized in that: The arrangement and installation of the lifting and positioning device also includes the following steps: Before the step of installing the adjustable pull rod, a protective sleeve is installed in the second water flow hole of the lower support plate.

6. The head assembly method according to claim 4, characterized in that: The lifting and assembling step comprises the following steps: S31, lifting the head and allowing the guide member to enter the corresponding installation hole; S32, continue to lift the end cap until the end cap abuts against the lower support plate; and S33, removing the guide member and fixing it through the mounting hole and the centering ring hole.

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