Tool and method for taking out inner core of epoxy resin machine mixing pipe of LNG containment system

Abstract

The invention discloses a tool for taking out an inner core of a static mixing pipe of an epoxy resin machine of an LNG (Liquefied Natural Gas) containment system, which comprises a base nut matched with an external thread of an outer pipe of the mixing pipe in size. And the screw is matched with the threads of the base nut, one end of the screw is provided with a screw nut, and the other end of the screw is provided with a rotatable brass top. Through cooperation of the brass top, the plane sealing bearing and the needle roller thrust bearing, the inner core can be rapidly taken out on the premise that the surface and the original precision of the inner core are not damaged, the cleaning efficiency is improved, the service life of the inner core is prolonged, the wear rate of the inner core is reduced, and the safety is improved.

Description

Technical Field

[0001] The invention relates to the field of construction of liquid cargo tanks of LNG containment systems, and in particular to a tool and method for removing an inner core of an epoxy resin machine mixing tube of an LNG containment system. Background Art

[0002] The MARK3 LNG containment system is a new type of LNG maintenance system launched by the French GTT company. Epoxy resin is the most important part of the construction process of the MARK3 LNG containment system cargo tank, which is suitable for -163 degree LNG transportation. During the installation phase of the MARK3 containment system module, the gap between the bulkhead and the module is based on the epoxy resin base to apply the two-component epoxy resin to the module bottom plate. After the resin is cured, it is bonded and filled with loads. Therefore, there are strict testing standards for whether the epoxy resin strip is fully mixed and the hardness meets the standard, as shown in Table 1:

[0003] Table 1 Epoxy resin strip testing standards

[0004]

[0005] In Table 1, if any of the test items fail, the module will be dismantled and reworked, which will bring huge construction cost losses and quality risks to the entire enclosure system. Whether a series of standards for epoxy resin strips are met is strongly dependent on the status of the two-component static mixing tube of the equipment.

[0006] The static mixing tube consists of an outer tube and a spiral inner core. Its function is to supply two-component glue (resin and curing agent / referred to as A material and B material) through the equipment glue pump, and flow A / B materials into the mixing tube through independent hoses according to the set ratio. After being fully stirred by the inner core spiral, the two components are mixed into a curable epoxy resin product. The specific composition of the static mixing is as follows: Figure 1 shown.

[0007] The factors that affect uneven mixing and substandard hardness of the mixer are as follows:

[0008] Because the two components A / B are finally mixed in the mixing tube, hardened residues will be generated in the tube. In actual production, the site must regularly decompose it and clean it with solvent. It was originally cleaned every 16 hours and found that there would still be hardened residues silting up, causing pipeline blockage, resulting in uneven mixing and hardened blockage. Figure 2 As shown. After clogging, a large number of unevenly mixed tiger skin patterns will be produced, affecting the hardness, so the cleaning frequency is shortened to once every 8 hours on site to reduce clogging.

[0009] At present, it is necessary to use an iron rod to insert and a hammer to hammer out the inner core. After increasing the cleaning frequency, each time the inner core is taken out, there will inevitably be solidified glue residue in the gap of the spiral inner core. Over time, the wear of the first spiral section of the inner core will increase synchronously. After a certain extent, uneven mixing, inner core breakage, deformation and jamming of the outer tube wall will occur, resulting in the loss of the mixing tube and increased construction costs. After cleaning 30 times, the inner core is basically worn out and cannot be used.

[0010] The existing removal method is too harmful to the stainless steel inner core, and the force direction is unstable when hammering, which can easily cause the first section of the inner core to be skewed and deformed, or even skewed too much, stuck on the inner wall, permanently blocked, and the iron rod rubbing against the inner wall of the outer tube causes internal wear and other uncontrollable factors, and improper cooperation between personnel can easily cause safety accidents. Therefore, how to accurately and reliably inspect the requirements of the rubber strip without affecting the quality and cycle of the liquid cargo tank containment system, ensure the accuracy of the surface pressure width and cross-sectional area of ​​the rubber strip, and reduce the construction and maintenance costs of LNG are the key issues that need to be broken through at present. Summary of the invention

[0011] In order to solve the above technical problems, the present invention provides a tool and method for removing the inner core of a static mixing tube of an epoxy resin machine in an LNG containment system, which utilizes existing resources, reduces the difficulty of removing the inner core and quality risks, and at the same time reduces the inner core loss rate, saves costs, and improves safety.

[0012] The object of the present invention is achieved through the following technical scheme: a static mixing tube inner core removal tool for an epoxy resin machine of an LNG containment system, comprising:

[0013] The base nut matches the external thread size of the outer tube of the mixing tube.

[0014] The screw rod is matched with the thread of the base nut, a screw nut is arranged at one end of the screw rod, and a rotatable brass head is arranged at the other end of the screw rod.

[0015] Preferably, the interior of the base nut is a T-thread, and the screw is a T screw.

[0016] Preferably, the base nut is made of stainless steel.

[0017] Preferably, the material of the screw is carbon steel.

[0018] Preferably, a plane sealing bearing is arranged between the screw and the brass head for transition fit installation.

[0019] Preferably, a thrust needle roller bearing is arranged between the bottom of the brass pin head and the plane sealing bearing.

[0020] Preferably, a flat washer is provided on each of the upper and lower surfaces of the thrust needle roller bearing.

[0021] In addition to providing a tool for removing the inner core of an epoxy resin machine static mixing tube of an LNG containment system, the present invention further provides a method for removing the inner core of an epoxy resin machine static mixing tube of an LNG containment system using the tool, which specifically includes the following steps:

[0022] Nest the base nut with the outer tube thread of the mixing tube, and initially screw one end of the screw connecting head into the mixing tube through the base nut. Use a wrench to tighten the screw nut, screw the screw further in, push the inner core until the inner core is separated and loosened from the solidified residue, and finally pull out the inner core manually.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] The present invention provides a tool and method for removing the inner core of an epoxy resin machine static mixing tube of an LNG containment system, which belongs to the field of liquid cargo tank construction of a MARK3 type LNG containment system. The inner core can be quickly removed without damaging the surface of the inner core and the original precision, thereby improving the cleaning efficiency of the mixed inner core, extending the service life of the inner core, reducing the wear rate of the inner core, saving costs, and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the static mixing tube structure of an epoxy resin machine;

[0026] Figure 2 This is a schematic diagram of the hardening and blocking of the mixing tube;

[0027] Figure 3 A cross-sectional view of a base nut in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the screw structure in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of a planar sealed bearing in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of a brass plug in an embodiment of the present invention;

[0031] Figure 7 It is a schematic diagram of the structure of a thrust needle roller bearing in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of a transition fit structure in which a plane sealing bearing is arranged between the screw and the brass plug in an embodiment of the present invention;

[0033] Fig. 9 This is a schematic diagram of the connection between the brass plug, the sealed bearing and the screw in an embodiment of the present invention;

[0034] Fig.10This is a schematic diagram of assembling the removal tool and the mixing tube in an embodiment of the present invention.

[0035] In the figure, 1 is a base nut; 2 is a screw; 3 is a screw nut; 4 is a brass head; 5 is a plane sealing bearing; 6 is a thrust needle bearing; 7 is an outer tube of a mixing tube; and 8 is an inner core. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] The technical solution of the present invention provides a static mixing tube inner core removal tool for an epoxy resin machine of an LNG containment system, comprising:

[0038] The base nut 1 matches the external thread size of the mixing tube outer tube 7;

[0039] The screw rod 2 matches with the thread of the base nut 1. A screw nut 3 is arranged at one end of the screw rod 2, and a rotatable brass head 4 is arranged at the other end.

[0040] like Figure 3 to Figure 4 As shown, the base nut 1 has a T thread inside, and the screw 2 is a T screw. The internal thread of the base nut 1 is G1-1 / 4, the depth is 25mm, the external height is 49mm, the matching thread of the T screw is T24*4, and the material of the base nut 1 is stainless steel.

[0041] like Figure 4 As shown, in one embodiment of the invention, the material of the screw rod 2 is carbon steel. The total length of the screw rod 2 is 245 mm, the outer diameter of the thread is T24*4, and the material is carbon steel.

[0042] like Figure 5 As shown, in one embodiment of the invention, a plane sealing bearing 5 is arranged between the screw 2 and the brass head 4 for transitional installation. The plane sealing bearing 5 has a diameter of 24 mm, an inner diameter of 9 mm, and a thickness of 8 mm.

[0043] like Figure 6 As shown, in one embodiment of the present invention, the brass plug 4 embedded in the upper part of the plane sealing bearing 5 is "T"-shaped, with an upper diameter of 27 mm and a thickness of 6 mm, and a lower diameter of 9.07 mm and a thickness of 7 mm.

[0044] like Figure 7As shown, in one embodiment of the present invention, a thrust needle roller bearing 6 is arranged between the bottom of the brass plug 4 and the plane sealing bearing 5. The thrust needle roller bearing 6 has an outer diameter of 24 mm, an inner diameter of 10 mm, and a thickness of 2 mm. There is a plane gasket on each side of the bearing, and the outer diameter of the plane gasket is 24 mm, the inner diameter is 10 mm, and the thickness is 2 mm. In this embodiment, a plane sealing bearing 5 is arranged between the screw 2 and the brass plug 4 for transitional installation, as shown in FIG. Figure 8 shown.

[0045] In addition to providing a tool for removing the inner core of the static mixing tube of the epoxy resin machine of the LNG containment system, the technical solution of the present invention further provides a method for removing the inner core of the static mixing tube of the epoxy resin machine of the LNG containment system using the above tool, which specifically includes the following steps:

[0046] The base nut 1 is threadedly nested with the outer tube 7 of the mixing tube, and one end of the screw 2 connected to the top is initially screwed into the mixing tube through the base nut 1. The screw nut 3 is screwed with a wrench, and the screw 2 is further screwed in to push the inner core 8 until the inner core 8 is separated from the solidified residue and loosened, and finally the inner core 8 is pulled out manually.

[0047] In one embodiment of the present invention, the tooling used for removing and cleaning the inner core of the epoxy resin machine two-component static mixing tube can quickly remove the inner core without damaging the inner core surface and the original precision, thereby improving the cleaning efficiency, extending the service life of the inner core, reducing the inner core wear rate, and improving the safety. The tooling includes a base nut 1 with a T thread in the middle; a T screw rod 2 is matched on the T thread of the base nut 1, and a screw nut 3 is welded at the bottom of the screw rod; a plane sealing bearing 5 is assembled on the top of the screw rod, and a brass top rod 4 is embedded in the upper part of the plane sealing shaft. The brass is relatively soft and will not damage the first section surface of the inner core 9. A thrust needle bearing 6 and two plane gaskets are installed between the lower part of the brass top rod 4 and the plane sealing bearing 5. When the screw rod 2 pushes the inner core 9, only thrust is formed between the brass and the surface of the inner core 9, and no friction is formed. The thrust is formed by the force of the outer tube thread to push the inner core 9 to separate and loosen from the solidified residue. After loosening, only manpower is needed to pull out the inner core, which greatly reduces the wear rate, improves the cleaning efficiency, and improves the safety. This tool is at least applicable to the construction of MARK3 type LNG containment system liquid cargo tanks.

[0048] like Figures 9 and 10As shown, in this embodiment, the size of the external thread of the outer tube 7 of the mixing tube is first measured, and a base nut 1 is made to be sleeved on the tube mouth. Then, the inner diameter of the outer tube is measured to determine the diameter of the tooling plug. The surface of the first section of the mixing core 9 is contacted as much as possible without wearing the inner wall of the outer tube. A T-threaded screw with greater pushing force is used, and a screw nut 3 is welded at the tail to push the screw 2 upward with a wrench. The plug design of the pushing link uses brass material, which is softer and not easy to wear the first section of the mixing core 9. However, when the T-threaded screw is rotated, the brass plug 4 will rotate together to cause torque on the surface of the mixing core 9. Therefore, a plane sealing bearing 5 is used between the T screw and the brass plug 4 for transitional installation. In order to avoid excessive thrust causing the brass plug 4 to get stuck and not rotate, a thrust needle roller bearing 6 is additionally added between the bottom of the brass plug 4 and the plane sealing bearing 5. The inner core 9 is pushed to separate and loosen from the solidified residue without wear. Once pushed, only manpower is needed to pull out the inner core, and the inner core can be quickly removed without damaging the inner core surface and the original precision, thereby improving the cleaning efficiency of the mixed inner core, extending the service life of the inner core, reducing the inner core wear rate, saving costs, and improving safety.

[0049] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A tool for removing the inner core of a static mixing tube of an epoxy resin machine for an LNG containment system, characterized in that: The tooling includes: The base nut (1) matches the external thread size of the mixing tube outer tube (7); The screw rod (2) matches the thread of the base nut (1), one end of the screw rod (2) is provided with a screw rod nut (3), and the other end is provided with a rotatable brass head (4).

2. The LNG containment system epoxy resin machine static mixing tube inner core removal tool as claimed in claim 1, characterized in that: The interior of the base nut (1) is a T-thread, and the screw rod (2) is a T-screw rod.

3. The LNG containment system epoxy resin machine static mixing tube inner core removal tool as claimed in claim 1, characterized in that: The base nut (1) is made of stainless steel.

4. The LNG containment system epoxy resin machine static mixing tube inner core removal tool as claimed in claim 1, characterized in that: The material of the screw rod (2) is carbon steel.

5. The tooling for removing the inner core of the static mixing tube of the epoxy resin machine of the LNG containment system according to claim 1, characterized in that: A plane sealing bearing (5) is arranged between the screw rod (2) and the brass plug (4) for transitional fitting installation.

6. The tooling for removing the inner core of the static mixing tube of the epoxy resin machine of the LNG containment system according to claim 5, characterized in that: A thrust needle roller bearing (6) is arranged between the bottom of the brass pin head (4) and the plane sealing bearing (5).

7. The tooling for removing the inner core of the static mixing tube of the epoxy resin machine of the LNG containment system according to claim 6, characterized in that: A flat washer is provided on each of the upper and lower surfaces of the thrust needle roller bearing (6).

8. A method for removing the inner core of a static mixing tube of an epoxy resin machine of an LNG containment system, characterized in that: The method according to any one of claims 1 to 7 further provides a method for removing the inner core of the static mixing tube of the epoxy resin machine of the LNG containment system by using the above-mentioned LNG containment system epoxy resin machine static mixing tube inner core removal tool, specifically The following steps are involved: The base nut (1) is threadedly nested with the outer tube (7) of the mixing tube, and one end of the screw rod (2) connected to the top is initially screwed into the mixing tube through the base nut (1). The screw rod nut (3) is screwed with a wrench, and the screw rod (2) is further screwed in, pushing the inner core (8) until the inner core (8) is separated from the solidified residue and loosened, and finally the inner core (8) is pulled out manually.

Images