Polishing device for joint welding seam toe end of LNG transportation ship body structure
By designing a mobile bracket support grinder, the smooth movement of both sides of the weld is achieved by using rubber rollers, which solves the problem of low weld grinding efficiency in the prior art, and significantly improves the grinding efficiency and fatigue life of weld connections.
Patent Information
- Application Number
- CN202421616670.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The prior art lacks a fast and effective weld toe grinding device, resulting in limited efficiency in improving the fatigue life of the weld at the node of the LNG transport hull structure, and on-site grinding consumes a lot of labor and energy.
A grinding device for the toe end of the node weld of the LNG transport hull structure including a grinder and a moving bracket is designed. The supporting frame is formed by parallel cross rods and vertical rods, and the smooth movement of both sides of the weld is achieved through rubber rollers, combined with adjustment. The frame and limit pin ensure consistency in polishing and reduce labor intensity.
The grinder is able to move rapidly and linearly along the weld by moving the bracket, which significantly improves the grinding efficiency and reduces the grinding time per meter of weld by half, avoids excessive grinding and improves the fatigue life of weld connections.
Smart Images
Figure CN222199935U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of shipbuilding, in particular to a device for grinding the toe end of a weld at a node of a LNG transport ship structure. Background Art
[0002] The global LNG shipping market is very vast, and domestic shipyards are increasingly involved in the construction of LNG carriers. LNG carriers usually require full ship fatigue analysis.
[0003] There are generally two ways to improve the fatigue life of some hull structure nodes in the existing technology. One is to change the corresponding structural nodes and change the force mode by changing the structure, so as to improve the fatigue life; changing the corresponding structural nodes and changing the force mode by changing the structure to improve the fatigue life will have the risk of increasing the weight of the hull structure and affect the weight of the entire ship. The other is to grind the toe of the weld at the node and increase the fatigue life by changing the connection between the toe of the weld and the base material. This method can avoid adding structure or optimizing structure to improve fatigue life.
[0004] As for grinding the toe of the weld at the node, there is currently no fast grinding tooling equipment, and the most primitive method is usually used on site for grinding, which consumes a lot of manpower and energy. Summary of the invention
[0005] In order to increase the fatigue life of welds at ship structure nodes and improve the efficiency of weld grinding, the utility model aims to provide a device for grinding the toe end of welds at ship structure nodes of an LNG transport ship.
[0006] The technical solution adopted by the utility model is:
[0007] The LNG transport ship structure node weld toe grinding device comprises a grinder and a mobile bracket for installing the grinder, wherein the mobile bracket comprises a pair of parallel horizontal cross bars, the pair of cross bars are connected by a plurality of connecting rods to form a support frame, the connecting rods are perpendicular to the cross bars and are welded and fixed to the cross bars; a pair of the cross bars are provided with mounting grooves in the middle, the mounting part of the grinder cooperates with and is fixedly connected to the mounting grooves of the cross bars; the pair of cross bars are respectively connected to at least one vertical pole, and the ends of the cross bars are connected to the vertical poles. A cross bar roller is installed through a rotating shaft, and the cross bar roller is set horizontally or at an acute angle to the horizontal plane. A vertical pole roller is installed at the lower end of each vertical pole through a rotating shaft. The vertical pole roller is set vertically, and the rotating shaft corresponding to the vertical pole roller is perpendicular to the weld; a penetrating mounting hole is set on the cross bar along its length direction, and the upper section of the vertical pole is inserted into the corresponding mounting hole. The upper section of the vertical pole is provided with a plurality of limiting holes evenly distributed along its height direction, and a limiting pin is installed on the side of the cross bar, and the limiting pin corresponds to the limiting hole.
[0008] Furthermore, the cross bar roller at the end of the cross bar is installed on the adjustment frame, and the adjustment frame is installed on the end of the cross bar by bolts; both ends of the adjustment frame are provided with U-shaped openings, one end of the adjustment frame is sleeved on the end of the cross bar through the U-shaped opening and fixed with bolts passing through the U-shaped opening and the cross bar, and the cross bar roller is rotatably supported in the U-shaped opening at the other end of the adjustment frame through a rotating shaft.
[0009] Furthermore, the vertical poles and the horizontal poles are both square tubes, the inner dimensions of the mounting holes correspond to the outer dimensions of the vertical poles, and the vertical poles connected by the two horizontal poles are arranged correspondingly.
[0010] Furthermore, the vertical rod and the horizontal rod rollers are distributed on both sides of the grinder.
[0011] Furthermore, the vertical rod roller and the horizontal rod roller are respectively supported on the hull structure surface on both sides of the weld to be ground.
[0012] Furthermore, the vertical rod rollers and the horizontal rod rollers are rubber rollers.
[0013] Furthermore, the width of the mounting groove is greater than the width of the mounting portion of the grinder, and the mounting portion is mounted in cooperation with the waist-shaped groove on the mounting groove by means of bolts.
[0014] After adopting the above technical scheme, the beneficial effects of the utility model are:
[0015] By designing a mobile bracket to support the grinder and using the mobile bracket to achieve rapid linear movement of the grinder along the weld, the grinding speed can be effectively increased and the labor intensity of the grinding work can be reduced. The grinding time for each meter of the weld is reduced by more than half, which improves efficiency. Since the mobile bracket is supported on both sides of the weld and can move horizontally and smoothly through rollers, the consistency of weld grinding can be ensured, over-grinding can be prevented, and weld repair and re-grinding caused by over-grinding can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] Figure 2 It is a top view of the utility model.
[0018] Figure 3 It is a working schematic diagram of the utility model.
[0019] In the figure: grinder 1, movable bracket 2, cross bar 3, connecting rod 4, vertical rod 5, welding seam 6, cross bar roller 7, mounting hole 8, limit pin 9, vertical rod roller 10, adjustment frame 11, mounting groove 12, mounting part 13. DETAILED DESCRIPTION
[0020] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings:
[0021] like Figure 1 As shown, the LNG transport ship structure node weld toe grinding device is composed of a grinder 1 and a mobile bracket 2 for installing the grinder 1.
[0022] The mobile bracket 2 includes a pair of parallel horizontal cross bars 3, which are connected by a plurality of equally spaced connecting rods 4, which are perpendicular to the cross bars 3 and welded to the cross bars 3 to form a support frame. The walking function of the mobile bracket is composed of a vertical rod 5 connected to one end of the cross bar 3 and a cross bar roller 7 installed at the other end of the cross bar 3.
[0023] A plurality of vertically penetrating mounting holes 8 are provided on the crossbar 3 along its length direction. The mounting holes 8 are used to install the vertical poles 5. Both the vertical poles 5 and the crossbar 3 are square tubes. The upper section of the vertical pole 5 is inserted into the corresponding mounting hole 8. The inner dimension of the mounting hole 8 corresponds to the outer dimension of the vertical pole 5. The upper section of the vertical pole 5 is provided with a plurality of limit holes evenly distributed along its height direction. The side of the crossbar 3 is provided with a pin hole corresponding to the mounting hole and a horizontal limit pin 9 is inserted. The limit pin 9 can be a spring pin. After the vertical pole 5 is inserted into the mounting hole 8 of the crossbar 3, the limit pin 9 is matched with the limit hole to limit the vertical pole 5. The lower end of the vertical pole 5 is installed with a vertical pole roller 10 through a rotating shaft. The vertical pole roller 10 is a rubber roller. The vertical pole roller 10 is vertically arranged and rolls with the horizontal surface on one side of the weld 6. The rotating shaft corresponding to the vertical pole roller 10 is perpendicular to the length direction of the weld 6. The positions of the vertical poles 5 connected to the two crossbars 3 correspond, and the corresponding vertical poles are connected and fixed by a connecting rod. One or two vertical poles 5 are installed on the same horizontal pole 3 .
[0024] A crossbar roller 7 is installed at one end of the crossbar 3 away from the vertical rod. The crossbar roller 7 is a rubber roller. The crossbar roller 7 is rotatably supported at the end of the crossbar 3 through a rotating shaft. The crossbar roller 7 is horizontally arranged and rolls with the vertical surface or inclined surface on the other side of the weld 6. Considering the existence of an inclined surface on one side of the weld 6, in order to ensure the verticality of the crossbar roller and the inclined surface, and the adjustment of the position of the mobile bracket 2 relative to the weld 6, the crossbar roller 7 is installed on the adjustment frame 11. Both ends of the adjustment frame 11 are provided with U-shaped openings. One end of the adjustment frame 11 is sleeved on the end of the crossbar 3 through the U-shaped opening and can be adjusted and fixed by bolts passing through the U-shaped opening and the crossbar. The crossbar roller 7 is rotatably supported in the U-shaped opening at the other end of the adjustment frame 11 through a rotating shaft. The angle of the adjustment frame can be adjusted according to the inclination angle of the inclined surface, so that the crossbar roller and the inclined surface remain vertical. The position of the mobile bracket 2 relative to the weld 6 can also be changed by adjusting the angle of the adjustment frame.
[0025] A mounting groove 12 is machined in the middle of a pair of cross bars 3. The mounting portion 13 of the grinder 1 is matched with and fixedly connected to the mounting groove 12 of the cross bar 3. The width of the mounting groove is greater than the width of the mounting portion 13 of the grinder. A waist-shaped groove is machined in the mounting groove 12. The mounting portion 13 is fixed by bolts passing through the waist-shaped groove. The position of the grinder 1 can be adjusted along the waist-shaped groove to facilitate alignment with the weld 6. At the same time, by adjusting the height of the vertical pole 5 and the angle of the adjustment frame 11, the grinding head of the grinder 1 is in contact with the weld 6 to ensure the degree of grinding and avoid over-grinding. The mobile bracket is pushed along the weld 6, and the mobile bracket drives the grinder 1 to grind along the weld 6, thereby reducing labor intensity and improving grinding efficiency.
Claims
1. An LNG transport ship structure node weld toe grinding device, comprising a grinder and a mobile bracket for installing the grinder, characterized in that: The movable bracket comprises a pair of horizontal cross bars arranged in parallel, the pair of cross bars are connected by multiple connecting rods to form a supporting frame, the connecting rods are perpendicular to the cross bars and are welded and fixed between the cross bars; a mounting groove is provided in the middle part of the pair of cross bars, and the mounting part of the grinder cooperates with and is fixedly connected to the mounting groove of the cross bars; a pair of cross bars are respectively connected to at least one vertical upright pole, the end of the cross bar is equipped with a cross bar roller through a rotating shaft, the cross bar roller is arranged horizontally or at an acute angle to the horizontal plane, the lower end of each upright pole is respectively equipped with an upright pole roller through a rotating shaft, the upright pole roller is arranged vertically, and the rotating shaft corresponding to the upright pole roller is perpendicular to the weld; a penetrating mounting hole is provided on the cross bar along its length direction, the upper section of the upright pole is inserted into the corresponding mounting hole, the upper section of the upright pole is provided with a plurality of limit holes evenly distributed along its height direction, and a limit pin is installed on the side of the cross bar, and the limit pin cooperates with the limit hole accordingly.
2. The LNG transport ship structure node weld toe grinding device according to claim 1 is characterized in that: The cross bar roller at the end of the cross bar is installed on the adjustment frame, and the adjustment frame is installed on the end of the cross bar by bolts; both ends of the adjustment frame are provided with U-shaped openings, one end of the adjustment frame is sleeved on the end of the cross bar through the U-shaped opening and fixed by bolts passing through the U-shaped opening and the cross bar, and the cross bar roller is rotatably supported in the U-shaped opening at the other end of the adjustment frame through a rotating shaft.
3. The LNG transport ship structure node weld toe grinding device according to claim 1 is characterized in that: The vertical poles and the horizontal poles are both square tubes, the inner dimensions of the mounting holes correspond to the outer dimensions of the vertical poles, and the vertical poles connected by the two horizontal poles are arranged correspondingly.
4. The LNG transport ship structure node weld toe grinding device according to claim 3 is characterized in that: The vertical rod and the horizontal rod rollers are distributed on both sides of the grinder.
5. The LNG transport ship structure node weld toe grinding device according to claim 1 is characterized in that: The vertical rod roller and the horizontal rod roller are respectively supported on the hull structure surface at both sides of the weld to be ground.
6. The LNG transport ship structure node weld toe grinding device according to claim 1 is characterized in that: The vertical rod rollers and the horizontal rod rollers are rubber rollers.
7. The LNG transport ship structure node weld toe grinding device according to claim 1 is characterized in that: The width of the mounting groove is greater than the width of the mounting portion of the grinder, and the mounting portion is mounted in cooperation with the waist-shaped groove on the mounting groove through bolts.