Manufacturing process of movable and fixed ring beams of stepping type lifting system

Abstract

The invention relates to the technical field of ocean platform self-elevating lifting devices, in particular to a manufacturing process of a movable ring beam and a fixed ring beam of a stepping type lifting system.The ring beam comprises a steel plate, a forge piece, a bolt seat and an oil cylinder pin seat, inner holes of the bolt seat and the oil cylinder pin seat need to be machined, and therefore the position degree and the concentricity of the bolt seat and the oil cylinder pin seat need to be strictly guaranteed; an assembling tool is adopted for assembling a ring beam assembly and components, welding shrinkage allowance needs to be reserved at the relative position between a bolt seat and an oil cylinder pin seat in advance, certain allowance needs to be reserved on the non-machining faces of the bolt seat and the oil cylinder pin seat, the thickness is prevented from being thinned after machining, the oil cylinder pin seat needs to be machined after being welded, and therefore the machining efficiency is improved. After an oil cylinder pin seat and a side plate are welded into an assembly, the assembly needs to be corrected, and a rigid supporting tool needs to be additionally arranged in an opening in a ring beam before a ring beam part is welded. The movable ring beam and the fixed ring beam can be prevented from deforming in the manufacturing process, and the concentricity and the position degree of the movable ring beam and the fixed ring beam after manufacturing are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of self-elevating lifting devices for marine platforms, and in particular to a manufacturing process for movable and fixed ring beams of a step-type lifting system. Background Art

[0002] The step-type lifting system (single pile) is usually composed of a moving ring beam, a fixed ring beam, a balancing assembly, a lifting cylinder assembly, a latch assembly, a hydraulic pump station and an electronic control system. The power is provided by the hydraulic pump station to drive the cylinder to extend or shorten, and act on the platform or the pile leg through the ring beam and the latch assembly to complete the platform's rising and lowering, the pile leg's rising and lowering, pre-loading and pile pulling functions. Summary of the invention

[0003] The purpose of the present invention is to address the defects of the prior art and provide a manufacturing process for the dynamic and fixed ring beams of a step-type lifting system, which can avoid deformation of the dynamic ring beam and the fixed ring beam during the manufacturing process and ensure the concentricity and position of the dynamic ring beam and the fixed ring beam after manufacturing.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A manufacturing process for a moving and fixed ring beam of a step-type lifting system, wherein the ring beam comprises a steel plate, a forging, a latch seat and a cylinder pin seat, the inner holes of the latch seat and the cylinder pin seat both need to be processed, so their position and concentricity need to be strictly guaranteed, and assembly tooling is used to assemble the ring beam components and parts;

[0006] The relative position between the latch seat and the cylinder pin seat needs to reserve a welding shrinkage allowance in advance, and a certain allowance should be reserved for the non-machined surfaces of the latch seat and the cylinder pin seat to prevent the thickness from becoming thinner after machining;

[0007] The cylinder pin seat needs to be processed after welding, and the cylinder pin seat needs to be corrected after being welded to the side plate. Before welding the ring beam component, a rigid support tooling needs to be added to the ring beam.

[0008] The ring beam needs to be aligned and assembled after laying out the ground sample, and the alignment method is to hang a plumb line;

[0009] When processing the ring beam, the cutting line and the inspection line of the guide plate should be marked, and the guide plate should be assembled after cutting according to the cutting line. After the guide plate is welded, the distance between the arc surface and the inspection line should be checked again;

[0010] During the assembly and welding process of the ring beam structure, the ring beam is easily deformed, which affects the subsequent operation of the cylinder pin seat and the balance component. Therefore, anti-deformation tooling is required to be added inside the ring beam before welding, and anti-deformation tooling is required to be added inside the ring beam during the welding process.

[0011] As a preferred technical solution of the present invention, the steel plates with a thickness greater than or equal to 50 mm are subjected to ultrasonic flaw detection on the entire plate, and 10% of the steel plates with a thickness less than 50 mm are subjected to ultrasonic flaw detection on a random basis.

[0012] As a preferred technical solution of the present invention, the steps of hanging the plumb line are as follows:

[0013] S1. When processing the ring beam components, the tooling pad is welded at the bottom of the components for unified reference machining to ensure the verticality of the components during assembly;

[0014] S2. When machining the ring beam components, punch holes with cross center lines on the end faces of the components to ensure the position of the components and the concentricity between the components according to the ground sample line.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention can prevent deformation of the moving ring beam and the fixed ring beam during the manufacturing process, thereby ensuring the concentricity and position accuracy of the moving ring beam and the fixed ring beam after manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a manufacturing flow chart of the ring beam of the present invention;

[0018] Figure 2 is a welding flow chart of the ring beam of the present invention;

[0019] Figure 3 It is an assembly diagram of the assembly tool and the ring beam of the present invention;

[0020] Figure 4 It is an assembly diagram of the latch seat and the anti-deformation tooling of the present invention;

[0021] Figure 5 It is an assembly diagram of the ring beam and the supporting tooling of the present invention;

[0022] Figure 6 It is an assembly diagram of the ring beam and the tooling pad of the present invention;

[0023] Figure 7 It is the general assembly drawing of the ring beam of the present invention. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] Example

[0027] The present invention provides a manufacturing process for the movable and fixed ring beams of a step-by-step lifting system, referring to Figure 1-7 As shown, the ring beam includes a steel plate, a forging, a latch seat and a cylinder pin seat.

[0028] The inner holes of the latch seat and the cylinder pin seat need to be processed, so their position and concentricity must be strictly guaranteed, and assembly tooling is used to assemble the ring beam assembly and components;

[0029] The relative position between the latch seat and the cylinder pin seat needs to reserve a welding shrinkage allowance in advance, and a certain allowance should be reserved for the non-machined surfaces of the latch seat and the cylinder pin seat to prevent the thickness from becoming thinner after machining;

[0030] Control of the size of the opening in the ring beam: the cylinder pin seat needs to be processed after welding, but the side plate is long and has many welds, which makes it easy to deform after welding, thus affecting the assembly of the subsequent processing machine balance components. The cylinder pin seat and the side plate need to be corrected after being welded into an assembly. Before welding the ring beam components, a rigid support tooling needs to be added to the opening in the ring beam;

[0031] The ring beam needs to be aligned and assembled after laying out the ground sample, and the alignment method is to hang a plumb line;

[0032] When processing the ring beam, the cutting line and the inspection line of the guide plate should be marked, and the guide plate should be assembled after cutting according to the cutting line. After the guide plate is welded, the distance between the arc surface and the inspection line should be checked again;

[0033] During the assembly and welding process of the ring beam structure, the ring beam is easily deformed, which affects the subsequent operation of the cylinder pin seat and the balance component. Therefore, anti-deformation tooling is required to be added inside the ring beam before welding, and anti-deformation tooling is required to be added inside the ring beam during the welding process.

[0034] Among them, the steel plates with a thickness greater than or equal to 50 mm are subjected to ultrasonic flaw detection on the entire plate, and the steel plates with a thickness less than 50 mm are subjected to ultrasonic flaw detection on 10% of the samples.

[0035] After the steel plate is cut, the seam area is spot-checked by magnetic particle inspection. No defects such as cracks, delamination, component segregation, and rolling are allowed.

[0036] The steel plate is pretreated after cutting. The oil and moisture are removed from the steel plate before pretreatment. After pretreatment, the steel plate shall not have firm rolling scale and other contaminants. After sandblasting, the surface cleanliness reaches Sa2.5 level in GB8923, and the roughness reaches RY40μm-80μm.

[0037] The steps of hanging the plumb line are as follows:

[0038] S1. When processing the ring beam components, the tooling pad is welded at the bottom of the components for unified reference machining to ensure the verticality of the components during assembly;

[0039] S2. When machining the ring beam components, punch holes with cross center lines on the end faces of the components to ensure the position of the components and the concentricity between the components according to the ground sample line.

[0040] Welding shrinkage allowance:

[0041] 1. Assemble on the platform. Before assembly, check that the flatness of the platform is less than 1 / 1000mm and the overall flatness is less than 2mm. Draw the ground sample line and the center line of the M on the platform. The angle between adjacent center lines is 45°. Draw the assembly position lines of the pin seat, cylinder pin seat and main board. After drawing the lines, use a spirit level to check again.

[0042] 2. After the welding of large structural parts is completed, there will be a certain degree of dimensional shrinkage due to thermal expansion and contraction. The overall inner opening size of the ring beam structural parts assembly is required to be 8mm larger than the theoretical size as a shrinkage allowance.

[0043] The present invention can prevent deformation of the moving ring beam and the fixed ring beam during the manufacturing process, thereby ensuring the concentricity and position accuracy of the moving ring beam and the fixed ring beam after manufacturing.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A manufacturing process for a moving and fixed ring beam of a step-type lifting system, wherein the ring beam comprises a steel plate, a forging, a latch seat and a cylinder pin seat, and is characterized in that: The inner holes of the latch seat and the cylinder pin seat need to be processed, so their position and concentricity must be strictly guaranteed, and assembly tooling is used to assemble the ring beam assembly and components; The relative position between the latch seat and the cylinder pin seat needs to reserve a welding shrinkage allowance in advance, and a certain allowance should be reserved for the non-machined surfaces of the latch seat and the cylinder pin seat to prevent the thickness from becoming thinner after machining; The cylinder pin seat needs to be processed after welding, and the cylinder pin seat needs to be corrected after being welded to the side plate. Before welding the ring beam component, a rigid support tooling needs to be added to the ring beam. The ring beam needs to be aligned and assembled after laying out the ground sample, and the alignment method is to hang a plumb line; When processing the ring beam, the cutting line and the inspection line of the guide plate should be marked, and the guide plate should be assembled after cutting according to the cutting line. After the guide plate is welded, the distance between the arc surface and the inspection line should be checked again; During the assembly and welding process of the ring beam structure, the ring beam is easily deformed, which affects the subsequent operation of the cylinder pin seat and the balance component. Therefore, anti-deformation tooling is required to be added inside the ring beam before welding, and anti-deformation tooling is required to be added inside the ring beam during the welding process.

2. The manufacturing process of the movable and fixed ring beams of the step-type lifting system according to claim 1 is characterized in that: The steel plates with a thickness greater than or equal to 50 mm are subjected to ultrasonic flaw detection on the entire plate, and 10% of the steel plates with a thickness less than 50 mm are subjected to ultrasonic flaw detection on a random basis.

3. The manufacturing process of the movable and fixed ring beams of the step-type lifting system according to claim 1 is characterized in that: The steps of hanging the plumb line are as follows: S1. When processing the ring beam components, the tooling pad is welded at the bottom of the components for unified reference machining to ensure the verticality of the components during assembly; S2. When machining the ring beam components, punch holes with cross center lines on the end faces of the components to ensure the position of the components and the concentricity between the components according to the ground sample line.

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