A method of stacking pressure vessel closures

Abstract

The present application relates to the technical field of ship pressure vessel manufacturing, and discloses a pressure vessel head stacking method, which comprises the following steps: hoisting a pressure vessel head to a designated position by hoisting equipment; placing a skid ring on the top of the pressure vessel head, wherein the skid ring comprises a connecting rope and a plurality of skid blocks, the skid blocks are arranged on the connecting rope at intervals, and the cross-sectional height of the skid blocks is greater than the height of the lifting lugs on the pressure vessel head; hoisting another pressure vessel head to be stacked on the pressure vessel head by hoisting equipment; and installing a connecting code plate between the upper and lower adjacent pressure vessel heads, wherein the upper part of the connecting code plate is fixedly connected with the upper pressure vessel head, and the lower part of the connecting code plate is fixedly connected with the lower pressure vessel head. The present application can stack pressure vessel heads, thereby improving the utilization rate of site space, reducing the occupation of site resources, and improving the structural stability of the stacked pressure vessel heads.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship pressure vessel manufacturing, in particular to a pressure vessel head stacking method. BACKGROUND

[0002] The pressure vessel head is a semi-finished structural component in the production process of LNG C-type liquid cargo tank, and one C-type LNG liquid cargo tank usually has two heads, and the diameter is generally more than 10m. Due to the reason of production transfer, the pressure vessel head is usually installed with temporary lifting lugs in structure. If two pressure vessel heads are directly stacked, it is extremely easy to cause structural deformation and insufficient stability. Therefore, the pressure vessel head can only be placed in single layer, and a large amount of site space is occupied during stacking. SUMMARY

[0003] The purpose of the present application is to provide a pressure vessel head stacking method, which can stack pressure vessel heads, improve the utilization rate of site space, reduce the occupation of site resources, and has high structural stability when the pressure vessel heads are stacked.

[0004] In order to achieve the above purpose, the present application provides a pressure vessel head stacking method, comprising the following steps:

[0005] Step 1: hoist one pressure vessel head to a designated position by hoisting equipment, and place the pressure vessel head with the plane end downward;

[0006] Step 2: place a skid ring on the top of the pressure vessel head in step 1, so that the placement position of the skid ring is equal to or higher than the position of the lifting lug on the pressure vessel head, wherein the skid ring comprises a connecting rope and a plurality of skid blocks, the plurality of skid blocks are arranged on the connecting rope at intervals, the leading end and the tail end of the connecting rope are connected, and the cross-sectional height of the skid block is greater than the height of the lifting lug on the pressure vessel head;

[0007] Step 3: hoist another pressure vessel head to be stacked on the pressure vessel head in step 2 by hoisting equipment;

[0008] Step 4: install a connecting code plate between the two adjacent pressure vessel heads, the upper part of the connecting code plate is fixedly connected with the upper pressure vessel head, and the lower part of the connecting code plate is fixedly connected with the lower pressure vessel head.

[0009] As a preferred scheme of the present application, the connecting code plate is provided with a plurality of and is arranged at intervals around the outer periphery of the pressure vessel head, the upper part of the connecting code plate is welded with the upper pressure vessel head, and the lower part of the connecting code plate is welded with the lower pressure vessel head.

[0010] As a preferred scheme of the present application, the upper part of the connecting plate is provided with a first reinforcing rib plate on the left and right sides respectively, the first reinforcing rib plate is welded with the upper pressure vessel head, the lower part of the connecting plate is provided with a second reinforcing rib plate on the left and right sides respectively, and the second reinforcing rib plate is welded with the lower pressure vessel head.

[0011] As a preferred scheme of the present application, the upper part of the connecting plate is provided with a first reinforcing rib plate on the left and right sides respectively, the first reinforcing rib plate is welded with the upper pressure vessel head, the lower part of the connecting plate is provided with a second reinforcing rib plate on the left and right sides respectively, and the second reinforcing rib plate is welded with the lower pressure vessel head.

[0012] As a preferred scheme of the present application, in the step 1, the hoisting device hoists and places the pressure vessel head on the gantry stool.

[0013] Compared with the prior art, the method for stacking pressure vessel heads has the following beneficial effects:

[0014] The lifting lugs on the pressure vessel head can avoid structural deformation of the upper pressure vessel head during stacking, effectively protecting the adjacent pressure vessel heads, and the cushion blocks play a buffering role when stacking the next pressure vessel head; the cushion blocks are connected by connecting ropes, which can fix the cushion blocks to reduce displacement of the cushion blocks when stacking the next pressure vessel head, the split arrangement of the multiple cushion blocks can avoid the breakage of the integral structure when stacking the next pressure vessel head, and the length of the connecting rope segment between the adjacent two cushion blocks can be adjusted to adjust the size of the entire cushion ring, so that it is suitable for overlapping and stacking pressure vessel heads of different diameters; the adjacent two pressure vessel heads are installed with the connecting plate, which effectively ensures the stability of the stacked pressure vessel heads; therefore, the present application can stack pressure vessel heads to improve the space utilization and reduce the occupation of site resources, and the structural stability of the stacked pressure vessel heads is high. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below.

[0016] Fig. 1 is a structural schematic view of placing a cushion ring on a pressure vessel head provided by the present application;

[0017] Fig. 2 is a structural schematic view of a pressure vessel head after installing a connecting plate provided by the present application;

[0018] In the figure, 1 is a pressure vessel head; 11 is a lifting lug; 2 is a cushion ring; 21 is a connecting rope; 22 is a cushion block; 3 is a connecting plate; 31 is a first reinforcing rib plate; and 32 is a second reinforcing rib plate. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0020] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0021] As shown in the preferred embodiment of the present application, a method for stacking pressure vessel heads comprises the following steps: Figs. 1-2

[0022] Step 1: hoist one pressure vessel head 1 to a designated position by hoisting equipment, and place the planar end of the pressure vessel head 1 downward; wherein the hoisting equipment hoists and places the pressure vessel head 1 on a gantry stool, and the hoisting equipment is preferably a crane;

[0023] Step 2: place a skid ring 2 on the top of the pressure vessel head 1 in step 1, so that the placement position of the skid ring 2 is equal to or higher than the position of the lifting lug 11 on the pressure vessel head 1 (preferably equal to the position of the lifting lug 11 on the pressure vessel head 1), wherein the skid ring 2 comprises a connecting rope 21 and a plurality of skid blocks 22, the plurality of skid blocks 22 are arranged at intervals on the connecting rope 21, the leading end of the connecting rope 21 is connected to the trailing end of the connecting rope 21, and the cross-sectional height of the skid block 22 is greater than the height of the lifting lug 11 on the pressure vessel head 1;

[0024] Step 3: hoist and stack another pressure vessel head 1 on the pressure vessel head 1 in step 2 by hoisting equipment;

[0025] Step 4: install a connecting code plate 3 between the two adjacent pressure vessel heads 1, the upper part of the connecting code plate 3 is fixedly connected with the upper pressure vessel head 1, and the lower part of the connecting code plate 3 is fixedly connected with the lower pressure vessel head 1. When multiple pressure vessel heads 1 need to be stacked, steps 2-4 are repeated. The number of pressure vessel heads 1 stacked is preferably an even number. In this embodiment, two pressure vessel heads 1 are stacked, which can manufacture a pressure vessel (such as an LNG C-type liquid cargo tank).

[0026] ​Thus, the present application can avoid the structural deformation of the lifting lug 11 on the pressure vessel head 1 to the pressure vessel head 1 stacked above, effectively protect the adjacent pressure vessel heads 1 above and below, and the cushion block 22 plays a buffering role when stacking the next pressure vessel head 1; moreover, the cushion block 22 is connected by the connecting rope 21, which fixes the cushion block 22 to reduce the displacement of the cushion block 22 when stacking the next pressure vessel head 1, and the split type arrangement of the plurality of cushion blocks 22 can avoid the case of breaking the integral structure when stacking the next pressure vessel head 1, in addition, the length of the connecting rope 21 section between the two adjacent cushion blocks 22 can be adjusted to adjust the size of the entire cushion ring 2, so as to be suitable for the overlapping stacking of pressure vessel heads 1 of different diameters; moreover, the two adjacent pressure vessel heads 1 are installed with the connecting code plate 3, which effectively ensures the stability of the pressure vessel head 1 when stacked; it can be seen that the present application can stack the pressure vessel head 1 to improve the space utilization rate and reduce the site resource occupation, and the structure stability of the pressure vessel head 1 when stacked is high and the operation is simple.

[0027] Exemplarily, the connecting code plate 3 is provided with a plurality of and is arranged at intervals around the outer periphery of the pressure vessel head 1, the upper part of the connecting code plate 3 is welded with the pressure vessel head 1 above, and the lower part of the connecting code plate 3 is welded with the pressure vessel head 1 below, which effectively improves the stability of the head stacking and ensures the product quality. When the pressure vessel head 1 is needed to be used, the connecting code plate 3 is detached from the two pressure vessel heads 1, and then it can be used normally.

[0028] Exemplarily, the left and right sides of the upper part of the connecting code plate 3 are respectively provided with first reinforcing rib plates 31, the first reinforcing rib plates 31 are welded with the pressure vessel head 1 above, the left and right sides of the lower part of the connecting code plate 3 are respectively provided with second reinforcing rib plates 32, and the second reinforcing rib plates 32 are welded with the pressure vessel head 1 below, which further improves the connection stability and firmness of the upper and lower parts of the connecting code plate 3 with the two pressure vessel heads 1 above and below.

[0029] Exemplarily, the cushion ring 2 is provided with four cushion blocks 22, and the four cushion blocks 22 are arranged at equal intervals to ensure that the cushion ring 2 can stably support the pressure vessel head 1 above. Preferably, the cushion block 22 is provided with a through hole through which the connecting rope 21 passes, so as to conveniently adjust the position of the cushion block 22 on the connecting rope 21. The connecting rope 21 can be a hemp rope.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] The above is only the preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and replacements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A method of stacking heads of pressure vessels, characterized in that, The method comprises the following steps: Step 1, hoist a pressure vessel head to a designated position by hoisting equipment, and place the planar end of the pressure vessel head downward; Step 2, place a skid ring on the top of the pressure vessel head in step 1, so that the placement position of the skid ring is equal to or higher than the position of the lifting lug on the pressure vessel head, wherein the skid ring comprises a connecting rope and a plurality of skid blocks, the plurality of skid blocks are arranged on the connecting rope at intervals, the skid blocks are provided with through holes through which the connecting rope passes, the leading end and the trailing end of the connecting rope are connected, and the cross-sectional height of the skid blocks is greater than the height of the lifting lug on the pressure vessel head; Step 3, hoist another pressure vessel head to be stacked on the pressure vessel head in step 2 by hoisting equipment; Step 4, install a connecting code plate between the two adjacent pressure vessel heads, the upper part of the connecting code plate is fixedly connected with the upper pressure vessel head, and the lower part of the connecting code plate is fixedly connected with the lower pressure vessel head; wherein a plurality of connecting code plates are arranged at intervals around the outer periphery of the pressure vessel head, the upper part of the connecting code plate is welded with the upper pressure vessel head, the lower part of the connecting code plate is welded with the lower pressure vessel head, the left and right sides of the upper part of the connecting code plate are respectively provided with first reinforcing rib plates which are welded with the upper pressure vessel head, and the left and right sides of the lower part of the connecting code plate are respectively provided with second reinforcing rib plates which are welded with the lower pressure vessel head.

2. The method of stacking heads of pressure vessels as claimed in claim 1, characterized in that, The skid ring is provided with four skid blocks which are arranged at equal intervals.

3. The method of stacking heads of pressure vessels as claimed in claim 1, characterized in that, In step 1, the hoisting equipment hoists and places the pressure vessel head on a gantry stool.

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