Preparation method and pressing mechanism for dihedral insulating plate of LNG membrane land storage tank

Abstract

A preparation method and a pressing mechanism for a dihedral insulating plate of an LNG membrane land storage tank. The pressing mechanism comprises a pressing device and an assembly mold (2), the pressing device comprising a pressing frame (1) and a cylinder mechanism, the assembly mold (2) comprising a planar portion (21) and an inclined portion (22), a top surface of the planar portion (21) being in a horizontal state, and a top surface of the inclined portion (22) being inclined upward from inside to outside; the pressing frame (1) is provided with a first longitudinal frame (11) and a second longitudinal frame (12) at two ends thereof, respectively, an edge part of the planar portion (21) of the assembly mold (2) protruding upward to form a limiting part (23), the assembly mold (2) being placed on the pressing frame (1), the limiting part (23) leaning against the first longitudinal frame (11), and the cylinder mechanism being disposed on the second longitudinal frame (12).

Description

Preparation method and pressing mechanism of dihedral insulation plate for LNG membrane land tank Technical Field

[0001] The present invention belongs to the field of liquefied natural gas, and in particular relates to a preparation method and a pressing mechanism of a dihedral insulating plate of an LNG film-type land tank. Background Art

[0002] LNG (liquefied natural gas) membrane-type land tank is a special equipment used to store and transport liquefied natural gas. The LNG membrane-type land tank consists of 56 walls forming a circular tank body. A dihedral insulation board with a 174° angle needs to be installed between adjacent walls, which is called a 174 dihedron. The structural composition of the 174 dihedron is shown in Figures 1 and 2. The middle is a reinforced polyurethane foam board, and plywood is bonded to the upper and lower surfaces of the foam board. The existing preparation method is to first prepare a foam board with a specified angle and four plywood boards in a V-shape, and then apply glue to the four plywood boards and bond them to the foam board. Two of the plywood boards are assembled to form a whole plywood board covering the upper and lower surfaces of the foam board. Then, a pressing process is performed to press and fix the two assembled plywood boards to the upper and lower surfaces of the foam board.

[0003] This method for preparing dihedral insulating panels has many drawbacks, as follows:

[0004] 1. Since both foam boards and plywood are special-shaped structures, the processing of foam boards and plywood takes a lot of time;

[0005] 2. Plywood needs to be chamfered for assembly. In addition, the special-shaped structures of foam boards and plywood make it difficult to achieve efficient mass production of foam boards and plywood, and the processing accuracy cannot be guaranteed;

[0006] 3. Due to the special-shaped structures of foam boards and plywood, they cannot be pressed together by conventional presses. A special pressing die needs to be added to the press, which not only increases the difficulty and cost of the pressing operation, but also makes the pressing effect unstable, making it difficult to achieve the ideal pressing effect.

[0007] 4. Due to the large errors in the size and chamfering of plywood, it is difficult to achieve high-precision docking of two plywood sheets on the same side, and it is impossible to ensure that the plywood joint seam is 0, which means that the appearance cannot be guaranteed and the performance of the dihedral insulation board will be affected;

[0008] 5. Since foam boards and plywood are both special-shaped structures, the utilization rate of raw materials during the processing is very low, which will waste a lot of raw materials.

[0009] Summary of the Invention

[0010] Purpose of the invention: In order to overcome the deficiencies in the prior art, a method for preparing dihedral insulation panels for LNG thin-film land tanks and a pressing mechanism are provided. This method changes the preparation process of the dihedral insulation panels and eliminates the need to process special-shaped foam panels and plywood. The method is not only very suitable for mass production and can significantly improve the preparation efficiency and productivity of the dihedral insulation panels, but also ensures the pressing effect of the plywood on the foam panel and the assembly and docking accuracy, thereby guaranteeing the performance of the dihedral insulation panels.

[0011] Technical solution: To achieve the above-mentioned purpose, the present invention provides a pressing mechanism for the dihedral insulating plates of LNG membrane-type land tanks, comprising a pressing device and an assembly mold, the pressing device comprising a pressing frame and a cylinder mechanism arranged on the pressing frame, the assembly mold comprising a plane portion and an inclined portion, the top surface of the plane portion is horizontal, and the top surface of the inclined portion is inclined upward from the inside to the outside, a first longitudinal frame and a second longitudinal frame are respectively provided at both ends of the pressing frame, the edge of the plane portion of the assembly mold protrudes upward to form a limit portion, the assembly mold is placed on the pressing frame, the limit portion leans against the first longitudinal frame, the cylinder mechanism is arranged on the second longitudinal frame, the assembly mold is used to place the dihedral insulating plates to be pressed, and the cylinder mechanism is used to press the dihedral insulating plates on the assembly mold.

[0012] Furthermore, the inclination angle between the inclined portion and the flat portion is 6 degrees.

[0013] Furthermore, a glue groove is provided at the connection between the inclined portion and the flat portion.

[0014] Furthermore, the cylinder mechanism includes several cylinders, a three-way reversing valve and a pressure reducing valve group, the three-way reversing valve and the pressure reducing valve group are installed on the second longitudinal frame, the cylinder is installed on the second longitudinal frame through the cylinder base, the pressure reducing valve group is used to set the air pressure, and the three-way reversing valve is used to switch the operating state of the cylinder.

[0015] Furthermore, a pad is provided at the end of the cylinder, and the pad is used to fit with the dihedral insulating plate.

[0016] Furthermore, support legs are provided at the four corners of the bottom of the pressing frame, and positioning pins that cooperate with the supporting legs are provided on the pressing frame. By inserting the positioning pins into the supporting legs, the position of the pressing frame can be stabilized, so that multiple pressing frames can be stacked together without sliding, thereby reducing the space occupied.

[0017] Furthermore, a forklift fork sleeve is provided at the bottom of the pressing frame to facilitate the movement of the pressing frame by a forklift.

[0018] Furthermore, the angle between the cylinder and the horizontal line is 6 degrees, ensuring that the thrust direction of the cylinder corresponds to the inclination of the second single-leg board, and the thrust direction and the second single-leg board are in a horizontal state, ensuring the best pressing effect.

[0019] The present invention provides a method for preparing a dihedral insulating plate for an LNG thin-film land tank, comprising the following steps:

[0020] S1: Two pieces of plywood and one piece of foam board are glued on the middle line and then pressed flat on a press to form a rectangular insulation board raw material;

[0021] S2: symmetrically chamfer both sides of the insulation board raw material to form beveled sides, and cut the middle of the plywood on the insulation board raw material to form a chamfer;

[0022] S3: Cutting the insulation board raw material into two pieces in the middle according to the chamfer to form a first single-leg board and a second single-leg board;

[0023] S4: Apply glue to the oblique sides of the first single-leg board and the second single-leg board;

[0024] S5: hoisting the first single-leg board and the second single-leg board onto the flat surface and the inclined surface of the assembly mold respectively, so that the inclined sides of the first single-leg board and the second single-leg board are attached together;

[0025] S6: According to the pressure required for pressing, the cylinder pressure is converted, the pressure reducing valve group is adjusted to the converted set pressure, and the three-way reversing valve is turned to the cylinder push side, so that the piston rod of the cylinder performs the pushing work, so that the pad is first attached to the outer side of the second single leg board, and then the second single leg board and the first single leg board are pressed together under the thrust of the piston rod;

[0026] S7: The glue between the first single-leg plate and the second single-leg plate is cured under a set pressure environment. After the curing time is up, the dihedral insulation plate can be removed.

[0027] Furthermore, after the glue is cured in step S7, the three-way reversing valve is turned to the inward retraction side of the cylinder, the cylinder performs the action of retracting the piston rod, the pad leaves the second single-leg plate, and the dihedral insulation plate is removed from the assembly mold.

[0028] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0029] 1. Both plywood and foam board only need to be made into a flat structure, and do not need to be processed into a special-shaped structure. Plywood also needs to be pre-processed with chamfers, which makes the processing of plywood and foam board very suitable for mass production and can greatly improve the preparation efficiency and productivity of dihedral insulation boards.

[0030] 2. There is no problem with processing accuracy of plywood and foam board, and there is no problem with docking accuracy of plywood. Ensuring that the plywood joint seam is 0 can also ensure the combination accuracy of plywood and foam board, and ensure the performance and appearance integrity of the two-sided insulation board.

[0031] 3. Since both plywood and foam board are flat plate structures, conventional presses can be accurately pressed without the need for auxiliary molds. This not only ensures the stability of the pressing and the pressing effect, but also reduces the difficulty and cost of the pressing operation.

[0032] 4. Since both plywood and foam board are flat board structures, the utilization rate of raw materials used in processing is greatly improved, saving a large amount of board raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic diagram of the three-dimensional structure of a conventional dihedral insulating plate;

[0034] FIG2 is a schematic diagram of the planar structure of a conventional dihedral insulating plate;

[0035] FIG3 is a schematic diagram of the structural combination of insulation board wool;

[0036] FIG4 is a schematic diagram of the insulation board raw material after trimming and cutting;

[0037] Figure 5 is a schematic structural diagram of a pressing mechanism;

[0038] FIG6 is a schematic diagram of the state of the pressing mechanism when performing pressing;

[0039] FIG7 is a schematic diagram of the three-dimensional structure of a dihedral insulating plate prepared in the present invention;

[0040] FIG8 is a schematic diagram of the planar structure of the dihedral insulating plate prepared in the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0042] The present invention provides a method for preparing a dihedral insulating plate for an LNG thin-film land tank, comprising the following steps:

[0043] S1: Preparation of insulation board raw materials

[0044] As shown in FIG3 , first, a first plywood 104, a second plywood 105, and a foam board 103 are prepared. The first plywood 104, the second plywood 105, and the foam board 103 are all rectangular planar board structures. The thicknesses of the first plywood 104 and the second plywood 105 are 12 mm and 9 mm, respectively. The widths of the first plywood 104, the second plywood 105, and the foam board 103 are the same, all 1.1 m. The foam board 103 is a reinforced polyurethane foam board.

[0045] The first plywood 104, the second plywood 105, and the foam board 103 are glued on the middle automatic line and then fed into a press to form a rectangular insulation board raw material;

[0046] S2: Edge cutting and chamfering of insulation board raw materials

[0047] 4, the insulation board raw material on both sides of the symmetrical chamfered to form a slope of 3 degrees of the side, the first plywood 104 and the second plywood 105 in the middle of the cut to form a chamfer;

[0048] S3: Cutting of insulation board raw materials

[0049] The insulation board raw material is cut into two in the middle to form a first single-leg board 101 and a second single-leg board 102, as shown in FIG4 ;

[0050] S4: Glue coating

[0051] Apply glue to the oblique sides of the first single-leg board 101 and the second single-leg board 102;

[0052] S5: Pressing and positioning

[0053] As shown in Figure 5, the present invention provides a pressing mechanism for a dihedral insulating plate of an LNG film-type land tank, comprising a pressing device and an assembly mold 2, the pressing device comprising a pressing frame 1 and a cylinder mechanism arranged on the pressing frame 1, the assembly mold 2 comprising a plane portion 21 and an inclined portion 22, the top surface of the plane portion 21 is horizontal, the top surface of the inclined portion 22 is inclined upward from the inside to the outside, the inclination of the inclined portion 22 and the plane portion 21 is 6 degrees, a glue groove 16 is provided at the connection between the inclined portion 22 and the plane portion 21, a first longitudinal frame 11 and a second longitudinal frame 12 are respectively provided at both ends of the pressing frame 1, the edge of the plane portion 21 of the assembly mold 2 protrudes upward to form a limit portion 23, and the assembly mold The tool 2 is placed on the pressing frame 1, the limiting part 23 leans against the first longitudinal frame 11, the cylinder mechanism includes 5 cylinders 3, a three-way reversing valve 4 and a pressure reducing valve group 5, the three-way reversing valve 4 and the pressure reducing valve group 5 are installed on the second longitudinal frame 12, the cylinder 3 is installed on the second longitudinal frame 12 through the cylinder base 6, the end of the piston rod of the cylinder 3 is provided with a pad 7, the angle between the cylinder 3 and the horizontal line is 6 degrees, the pressure reducing valve group 5 is used to set the air pressure, the three-way reversing valve 4 is used to switch the operating state of the cylinder 3, and support legs 13 are provided at the four corners of the bottom of the pressing frame 1. The pressing frame 1 is provided with a positioning slightly 14 that cooperates with the support legs 13, and the bottom of the pressing frame 1 is provided with a forklift fork sleeve 15;

[0054] As shown in FIG6 , the first single leg board 101 and the second single leg board 102 are hoisted on the flat portion 21 and the inclined portion 22 of the assembly mold 2, respectively, so that the oblique sides of the first single leg board 101 and the second single leg board 102 are attached together. At this time, the first single leg board 101 is in a horizontal state, and the inclination angle of the second single leg board 102 to the first single leg board 101 is 6 degrees.

[0055] S6: Pressing execution

[0056] The required pressure for pressing is converted into cylinder pressure, and the pressure reducing valve group 5 is adjusted to the converted set cylinder pressure (unit pressure 1.0 bar). The three-way reversing valve 4 is turned to the outward pushing side of the cylinder 3, so that the piston rod of the cylinder 3 performs the pushing work, so that the backing plate 7 is first attached to the outer side of the second single leg board 102. Then, under the thrust of the piston rod, the second single leg board 102 and the first single leg board 101 are pressed together;

[0057] S7: Pressing is completed

[0058] The glue between the first single-leg plate 101 and the second single-leg plate 102 is cured under a set pressure environment. The curing time is set according to the polymerization reaction time of the glue at different temperatures, and is generally not less than 8 hours. After the curing time is up, the three-way reversing valve 4 is turned to the inward retraction side of the cylinder 3, and the cylinder 3 performs the action of recovering the piston rod. The pad 7 leaves the second single-leg plate 102, and the dihedral insulating plate is removed from the assembly mold 2.

[0059] During the pressing and curing process of the glue, some of the glue will be squeezed out and fall into the glue connection groove 16 . After the dihedral insulation board is removed, the staff needs to clean the glue in the glue connection groove 16 .

[0060] The final prepared dihedral insulation board is shown in Figures 7 and 8. The first single-leg board 101 and the second single-leg board 102 are pressed and spliced ​​together. There is a splicing surface 106 between the first single-leg board 101 and the second single-leg board 102. The overall dihedral insulation board is at an angle of 174°.

[0061] In this embodiment, the above-mentioned solution of the present invention is compared with the existing preparation solution as shown in Figures 1 and 2, which has the following advantages:

[0062] 1. Both plywood and foam board only need to be made into a flat structure, and do not need to be processed into a special-shaped structure. Plywood also needs to be pre-processed with chamfers, which makes the processing of plywood and foam board very suitable for mass production and can greatly improve the preparation efficiency and productivity of dihedral insulation boards.

[0063] 2. There is no problem with processing accuracy of plywood and foam board, and there is no problem with docking accuracy of plywood. Ensuring that the plywood joint seam is 0 can also ensure the combination accuracy of plywood and foam board, and ensure the performance and appearance integrity of the two-sided insulation board.

[0064] 3. Since both plywood and foam board are flat plate structures, conventional presses can be accurately pressed without the need for auxiliary molds. This not only ensures the stability of the pressing and the pressing effect, but also reduces the difficulty and cost of the pressing operation.

[0065] 4. Since both plywood and foam board are flat board structures, the utilization rate of raw materials used in processing is greatly improved, saving a large amount of board raw materials.

Claims

1. A pressing mechanism for a dihedral insulating plate of an LNG film-type land tank, characterized in that: It includes a pressing device and an assembly mold, the pressing device includes a pressing frame and a cylinder mechanism arranged on the pressing frame, the assembly mold includes a plane part and an inclined part, the top surface of the plane part is in a horizontal state, and the top surface of the inclined part is inclined upward from the inside to the outside, the two ends of the pressing frame are respectively provided with a first longitudinal frame and a second longitudinal frame, the edge of the plane part of the assembly mold protrudes upward to form a limiting part, the assembly mold is placed on the pressing frame, the limiting part leans against the first longitudinal frame, the cylinder mechanism is arranged on the second longitudinal frame, the assembly mold is used to place the two-sided insulating plate to be pressed, and the cylinder mechanism is used to press the two-sided insulating plate on the assembly mold.

2. The pressing mechanism of the dihedral insulating plate of the LNG membrane type land tank according to claim 1 is characterized in that: The inclination angle between the inclined portion and the flat portion is 6 degrees.

3. A pressing mechanism for a dihedral insulating plate of an LNG membrane-type land tank according to claim 1 or 2, characterized in that: A glue connection groove is provided at the connection between the inclined portion and the flat portion.

4. The pressing mechanism of the dihedral insulating plate of the LNG membrane type land tank according to claim 1 is characterized in that: The cylinder mechanism includes a plurality of cylinders, a three-way reversing valve and a pressure reducing valve group, wherein the three-way reversing valve and the pressure reducing valve group are installed on a second longitudinal frame, and the cylinder is installed on the second longitudinal frame through a cylinder base, the pressure reducing valve group is used to set the air pressure, and the three-way reversing valve is used to switch the operating state of the cylinder.

5. The pressing mechanism of the dihedral insulating plate of the LNG membrane type land tank according to claim 4 is characterized in that: A backing plate is provided at the end of the cylinder, and the backing plate is used to fit with the dihedral insulating plate.

6. The pressing mechanism of the dihedral insulating plate of the LNG membrane type land tank according to claim 1 is characterized in that: Support legs are arranged at the four corners of the bottom of the pressing frame, and positioning pins matched with the supporting legs are arranged on the pressing frame.

7. The pressing mechanism of the dihedral insulating plate of the LNG membrane type land tank according to claim 6 is characterized in that: A forklift fork tooth sleeve is arranged at the bottom of the pressing frame.

8. The pressing mechanism of the dihedral insulating plate of the LNG membrane type land tank according to claim 4 is characterized in that: The angle between the cylinder and the horizontal line is 6 degrees.

9. A method for preparing a dihedral insulating plate for an LNG film-type land tank, characterized in that: The steps include: S1: Two pieces of plywood and one piece of foam board are glued in the middle by an automatic line and then pressed into a press to form a rectangular insulation board raw material; S2: symmetrically chamfering the two sides of the insulation board raw material to form oblique side edges, and cutting the middle of the plywood on the insulation board raw material to form a chamfer; S3: Cutting the insulation board raw material into two pieces in the middle according to the chamfer to form a first single-leg board and a second single-leg board; S4: Apply glue to the oblique sides of the first single-leg board and the second single-leg board; S5: The first single-leg plate and the second single-leg plate are hoisted on the flat surface and the inclined surface of the assembly mold respectively, so that the first The oblique sides of the first single-leg board and the second single-leg board are attached together; S6: according to the pressure required for pressing, convert it into the cylinder pressure, adjust the pressure reducing valve group to the converted set air pressure, turn the three-way reversing valve to the cylinder push side, so that the piston rod of the cylinder performs the pushing work, so that the pad is firstly attached to the outer side of the second single leg board, and then the second single leg board and the first single leg board are pressed together under the thrust of the piston rod; S7: The glue between the first single-leg plate and the second single-leg plate is cured under a set pressure environment, and the dihedral insulating plate can be removed after the curing time is up.

10. The method for preparing a dihedral insulating plate for an LNG film-type land tank according to claim 9, characterized in that: After the glue is cured in step S7, the three-way reversing valve is turned to the inner side of the cylinder, the cylinder performs the action of recovering the piston rod, the pad leaves the second single-leg plate, and the dihedral insulating plate is removed from the assembly mold.

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