Underwater composite material protective cover mold and modular preparation method of protective cover

Abstract

The present invention discloses a mold for an underwater composite material protective cover and a modular production method for the protective cover, belonging to the technical field of composite material protective cover production. The mold comprises a separately arranged end cover male mold and a middle cover male mold; the end cover male mold is provided with a first width scale mark; the end cover male mold can be reassembled and spliced ​​to form an end cover female mold, which can be reassembled to form the end cover of the underwater composite material protective cover; the middle cover male mold is provided with a second width scale mark; the middle cover male mold can be reassembled and spliced ​​to form a middle cover female mold, which can be reassembled to form the middle cover of the underwater composite material protective cover. The present invention can solve the problems of existing protective cover molds, such as high cost, high energy consumption, and the inability to use a single mold for multiple purposes, thereby effectively saving manufacturing costs and shortening production cycles.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material protective cover preparation, and in particular to an underwater composite material protective cover mold and a modular preparation method of the protective cover. Background Art

[0002] Underwater production systems, seabed observation networks and other equipment deployed on the seabed involved in the field of marine engineering are under long-term threats from fallen objects in the water and dragged fishing nets. Once damaged, repairs are complex and costly, and may cause related system facilities to malfunction. Therefore, underwater equipment usually requires the arrangement of protective structures.

[0003] Currently, steel structure protection devices are mostly used in the protection of underwater oil and gas production facilities, which have problems such as large structural size, high weight, need for anode corrosion protection, and high cost.

[0004] Although the emerging composite material protective cover can effectively solve the above problems to a certain extent, it faces the problem of being unable to achieve multiple uses with one mold. For different protected objects, targeted customized design and mold manufacturing are required. The product delivery time is long, the design and mold costs are high, and the design and mold cannot be reused.

[0005] However, with the in-depth advancement and rapid development of marine engineering, the structures and sizes of underwater production systems are diverse and most of them are large structures. The unique mold can no longer meet the needs of the rapid development of composite material protective covers. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a modular preparation method for an underwater composite material protective cover mold and a protective cover; the modular preparation method for an underwater composite material protective cover mold and a protective cover can solve the problems of high cost, high energy consumption, and inability to use one mold for multiple purposes of the existing protective cover mold, thereby effectively saving manufacturing costs and shortening the production cycle.

[0007] In order to solve the above technical problems, the present invention provides an underwater composite material protective cover mold, comprising an end cover positive mold and a middle cover positive mold arranged in a split manner;

[0008] The end cover male mold includes a first male mold left end, a first male mold middle section and a first male mold right end, and a first width scale line is provided on the edge of the convex surface of the first male mold middle section;

[0009] The left end of the first male mold can be turned into a left end of a first female mold of equal length and width, the middle section of the first male mold can be turned into a plurality of middle sections of the first female mold of equal length and unequal width, the right end of the first male mold can be turned into a right end of a first female mold of equal length and width, the left end of the first female mold, the middle section of the first female mold and the right end of the first female mold are spliced ​​together to form an end cover female mold, and the end cover female mold can be turned into an end cover of the underwater composite material protective cover;

[0010] The middle cover male mold includes a second male mold left end, a second male mold middle section and a second male mold right end, and a second width scale line is provided on the edge of the convex surface of the second male mold middle section;

[0011] The left end of the second male mold can be turned into the left end of the second female mold of equal length and width, the middle section of the second male mold can be turned into several second female mold middle sections of equal length but different width, the right end of the second male mold can be turned into the right end of the second female mold of equal length and width, the left end of the second female mold, the middle section of the second female mold and the right end of the second female mold are spliced ​​to obtain the middle cover female mold, and the middle cover female mold can be turned into the middle cover of the underwater composite material protective cover.

[0012] Through the above design, the present invention can more easily produce end cover female molds and middle cover female molds of different widths, and further produce the underwater composite material protective covers of different widths.

[0013] In a further improvement of the present invention, a first assembly bolt hole positioning line and a first support and fixing frame connection bolt hole positioning line are provided on the convex edge of the end cover positive mold; a second assembly bolt hole positioning line and a second support and fixing frame connection bolt hole positioning line are provided on the convex edge of the middle cover positive mold.

[0014] Through the above design, the present invention can more conveniently locate the bolt holes for assembling the end cover negative mold inverted protective cover and the bolt holes for connecting the support fixing frame, and locate the bolt holes for assembling the middle cover negative mold inverted protective cover and the bolt holes for connecting the support fixing frame.

[0015] In a further improvement of the present invention, the convex surface of the end cover male mold is provided with a lifting ear hole positioning line and / or a guide column positioning line and / or a reinforcing rib positioning line and / or a hose end positioning line and / or an ROV gripper positioning line and / or a locking hatch positioning line.

[0016] Through the above design, the present invention can more conveniently print the ear hole positioning line, guide column positioning line, reinforcement rib positioning line, hose end positioning line, ROV gripper positioning line and locking door positioning line for the end cover female mold.

[0017] In a further improvement of the present invention, an inspection door positioning line and / or a reinforcement rib positioning line are provided on the convex surface of the middle cover male mold.

[0018] Through the above design, the present invention can more conveniently print the inspection door positioning line and the reinforcement rib positioning line for the middle cover negative mold.

[0019] On one hand, the present invention provides a modular preparation method for an underwater composite material protective cover, which is prepared using the above-mentioned underwater composite material protective cover mold, comprising the following steps:

[0020] Step S1, remaking the end cover female mold in sections;

[0021] The left end of the first female mold is turned over on the left end of the first male mold of the end cover male mold; the middle section of the first female mold of the selected width is turned over on the middle section of the first male mold of the end cover male mold according to the width requirement of the product end cover; the right end of the first female mold is turned over on the right end of the first male mold of the end cover male mold;

[0022] Step S2, splicing the end cover female mold;

[0023] Splicing the left end of the first female mold, the middle section of the first female mold, and the right end of the first female mold to obtain an end cover female mold;

[0024] Step S3, remaking the end cover of the underwater composite material protective cover;

[0025] The end cover of the underwater composite material protective cover is obtained by replicating on the end cover female mold;

[0026] Step S4, remaking the middle cover female mold in sections;

[0027] The left end of the second female mold is turned over on the left end of the second male mold of the middle cover male mold; the middle section of the second female mold of the selected width is turned over on the middle section of the second male mold of the middle cover male mold according to the width requirement of the middle cover of the product; the right end of the second female mold is turned over on the right end of the second male mold of the middle cover male mold;

[0028] Step S5, splicing the middle cover female mold;

[0029] Splicing the left end of the second female mold, the middle section of the second female mold and the right end of the second female mold to obtain a middle cover female mold;

[0030] Step S6, remaking the middle cover of the underwater composite material protective cover;

[0031] The middle cover of the underwater composite material protective cover is obtained by turning the middle cover on the middle cover female mold;

[0032] Step S7, splicing with composite material protective cover underwater;

[0033] The end covers of the underwater composite material protective cover and the middle cover of the underwater composite material protective cover are spliced ​​together to obtain the underwater composite material protective cover.

[0034] Through the above design, this solution can more conveniently prepare underwater composite material protective covers.

[0035] In a further improvement of the present invention, the end cover female mold splicing in step S2 includes the following steps:

[0036] Covering the back of the joint seam: After the end cover female mold is turned over in sections on the end cover male mold, the left end of the turned first female mold, the middle section of the first female mold, and the right end of the first female mold are sequentially connected, and the back of the joint seam between the left end of the first female mold and the middle section of the first female mold, and the back of the joint seam between the middle section of the first female mold and the right end of the first female mold are respectively covered with fiberglass cloth or aluminum foil;

[0037] Filling the joints: filling the joints between the left end of the first female mold and the middle section of the first female mold, and the joints between the middle section of the first female mold and the right end of the first female mold with materials, and heating and curing them;

[0038] Splicing seam paving: Place fiberglass cloth on both sides of each splicing seam filler, place the pouring auxiliary material, and cover with vacuum bag film;

[0039] Joint filling: Fill the fiberglass cloth with resin to soak the fiberglass cloth with resin;

[0040] The joint seam is solidified by heating and solidifying, and demoulding is performed after solidification is completed. The left end of the first female mold, the middle section of the first female mold and the right end of the first female mold are spliced ​​together to obtain an end cover female mold.

[0041] Through the above design, this solution can more easily splice the left end of the first female mold, the middle section of the first female mold and the right end of the first female mold.

[0042] In a further improvement of the present invention, the middle cover female mold splicing in step S5 includes the following steps:

[0043] Covering the back of the joint: After the middle cover female mold is remade in sections on the middle cover male mold, the left end of the remade second female mold, the middle section of the second female mold, and the right end of the second female mold are sequentially connected, and the back of the joint between the left end of the second female mold and the middle section of the second female mold, and the back of the joint between the middle section of the second female mold and the right end of the second female mold are respectively covered with fiberglass cloth or aluminum foil;

[0044] Filling the joints: filling the joints between the left end of the second female mold and the middle section of the second female mold, and between the middle section of the second female mold and the right end of the second female mold with materials, and heating and curing them;

[0045] Splicing seam paving: Place fiberglass cloth on both sides of each splicing seam filler, place the pouring auxiliary material, and cover with vacuum bag film;

[0046] Joint filling: Fill the fiberglass cloth with resin to soak the fiberglass cloth with resin;

[0047] The joint seam is cured by heating and curing, and demoulding is performed after the curing is completed. The left end of the second female mold, the middle section of the second female mold and the right end of the second female mold are spliced ​​together to obtain a middle cover female mold.

[0048] Through the above design, this solution can more easily splice the left end of the second female mold, the middle section of the second female mold and the right end of the second female mold to obtain the middle cover female mold.

[0049] Another aspect of the present invention provides an underwater composite material protective cover mold, comprising an end cover positive mold and a middle cover positive mold arranged in a split manner;

[0050] The end cover positive mold can be turned over to obtain an end cover negative mold of equal length and width, and the end cover negative mold can be turned over to obtain the end cover of the underwater composite material protective cover;

[0051] The convex surface of the middle cover positive mold is provided with several second assembly bolt hole positioning lines in the length direction. The middle cover positive mold can be reproduced to obtain several middle cover negative molds of equal width and unequal length. The middle cover negative mold can be reproduced to obtain the middle cover of the underwater composite material protective cover.

[0052] Through the above design, the present invention can more easily produce end cover female molds and middle cover female molds of different lengths, and then produce underwater composite material protective covers of different lengths.

[0053] In a further improvement of the present invention, a first assembly bolt hole positioning line and a first support and fixing frame connection bolt hole positioning line are provided on the convex edge of the end cover positive mold; a second assembly bolt hole positioning line and a second support and fixing frame connection bolt hole positioning line are provided on the convex edge of the middle cover positive mold.

[0054] Through the above design, the present invention can more conveniently locate the bolt holes for assembling the end cover negative mold inverted protective cover and the bolt holes for connecting the support fixing frame, and locate the bolt holes for assembling the middle cover negative mold inverted protective cover and the bolt holes for connecting the support fixing frame.

[0055] In a further improvement of the present invention, the convex surface of the end cover male mold is provided with a lifting ear hole positioning line and / or a guide column positioning line and / or a reinforcing rib positioning line and / or a hose end positioning line and / or an ROV gripper positioning line and / or a locking hatch positioning line.

[0056] Through the above design, the present invention can more conveniently print the ear hole positioning line, guide column positioning line, reinforcement rib positioning line, hose end positioning line, ROV gripper positioning line, and locking door positioning line for the end cover female mold.

[0057] In a further improvement of the present invention, a second assembly bolt hole positioning line and a second support fixing frame connection bolt hole positioning line are provided on the convex edge of the middle cover positive mold.

[0058] Through the above design, the present invention can more conveniently imprint the bolt hole positioning lines for assembling the protective cover and the supporting fixing frame connecting bolt hole positioning lines for the middle cover female mold.

[0059] In a further improvement of the present invention, an inspection door positioning line and / or a reinforcement rib positioning line are provided on the convex surface of the middle cover male mold.

[0060] Through the above design, the present invention can more conveniently print the inspection door positioning line and the reinforcement rib positioning line for the middle cover negative mold.

[0061] On one hand, the present invention provides a modular preparation method for an underwater composite material protective cover, which is prepared using the above-mentioned underwater composite material protective cover mold, comprising the following steps:

[0062] Step S1, remaking the end cover female mold;

[0063] Turning the end cover female mold on the end cover male mold;

[0064] Step S2, remaking the end cover of the underwater composite material protective cover;

[0065] The end cover of the underwater composite material protective cover is obtained by replicating on the end cover female mold;

[0066] Step S3, remaking the middle cover female mold;

[0067] According to the length requirement of the middle cover of the product, a middle cover female mold of the selected length is made on the middle cover male mold;

[0068] Step S4, remaking the middle cover of the underwater composite material protective cover;

[0069] The middle cover of the underwater composite material protective cover is obtained by turning the middle cover on the middle cover female mold;

[0070] Step S5, splicing with composite material protective cover underwater;

[0071] The end covers of the underwater composite material protective cover and the middle cover of the underwater composite material protective cover are spliced ​​together to obtain the underwater composite material protective cover.

[0072] Through the above design, this solution can be more convenient for preparing underwater composite material protective covers.

[0073] Compared with the prior art, the present invention has the following beneficial effects:

[0074] The present invention can solve the problems of high cost, high energy consumption and inability to use one mold for multiple purposes in existing protective cover molds, thereby effectively saving manufacturing costs and shortening the production cycle.

[0075] The present invention designs the protective cover mold as a split end cover positive mold and a middle cover positive mold, and then reproduces the end cover negative molds and the middle cover negative molds of different widths as needed, as well as reproduces the end cover negative molds of the same length and the middle cover negative molds of different lengths, thereby achieving the purpose of reproducing protective covers of different widths or different lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] In order to more clearly illustrate the background technology or the technical solution of the present invention, the following is a brief introduction to the drawings used in conjunction with the prior art or specific implementation methods; obviously, the structures, proportions, sizes, etc. depicted in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0077] Figure 1 This is a schematic diagram of the end cover male mold structure of Example 1 of the specific implementation method of the present invention.

[0078] Figure 2 This is a schematic diagram of the structure of the middle cover male mold of Example 1 of the specific implementation method of the present invention.

[0079] Figure 3 This is a schematic diagram of the end cover male mold structure of Example 2 of the specific implementation method of the present invention.

[0080] Figure 4 This is a schematic diagram of the middle cover positive mold structure of Example 2 of the specific implementation method of the present invention.

[0081] Figure 5 This is a schematic structural diagram of the underwater composite material protective cover prepared by the present invention.

[0082] As shown in the figure: 1-left end of the first male mold; 2-middle section of the first male mold; 3-right end of the first male mold; 4-first width scale line; 5-left end of the second male mold; 6-middle section of the second male mold; 7-right end of the second male mold; 8-second width scale line; 9-first assembly bolt hole positioning line; 10-first support and fixing frame connection bolt hole positioning line; 11-lifting ear hole positioning line; 12-guide column positioning line; 13-reinforcement rib positioning line; 14-hose end positioning line; 15-ROV gripper positioning line; 16-locking hatch positioning line; 17-second assembly bolt hole positioning line; 18-second support and fixing frame connection bolt hole positioning line; 19-inspection hatch positioning line; 100-end cover of underwater composite material protective cover; 101-first assembly bolt hole; 200-middle cover of underwater composite material protective cover; 201-second assembly bolt hole. DETAILED DESCRIPTION

[0083] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative work should fall within the scope of protection of the present invention.

[0084] At the same time, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like cited in this specification to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying 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 operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. Changes or adjustments to their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0085] At the same time, in the description of this specification, it should be noted that, unless otherwise clearly stipulated and limited, the terms "install", "connect", and "connect" 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, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on specific circumstances.

[0086] Although the emerging composite material protective cover can effectively solve many problems of steel structure protection devices to a certain extent, it faces the current situation that it cannot achieve multiple uses with one mold. For different protected objects, targeted customized design and mold manufacturing are required. The product delivery time is long, the design and mold opening costs are high, and the design and mold cannot be reused.

[0087] However, with the in-depth advancement and rapid development of marine engineering, the structures and sizes of underwater production systems are diverse and most of them are large structures. The unique mold can no longer meet the needs of the rapid development of composite material protective covers.

[0088] Therefore, the design concept of this application is to use a set of positive molds (split end cover positive mold and middle cover positive mold) to segmentally remake female molds of different widths and lengths, and freely switch and assemble to achieve directional changes in the length and width of the protective cover product, saving the investment cost of the mold, while reducing the protective cover design and production line manufacturing cycle, so that the protective cover production can quickly switch production lines according to market changes. The preferred schemes for each positioning line and scale line in this application can be set using the etching process in the existing technology; the remaking of this application refers to the vacuum-assisted resin infusion molding process.

[0089] Example 1

[0090] like Figure 1 and Figure 2 As shown, the present invention provides an underwater composite material protective cover mold, comprising an end cover positive mold and a middle cover positive mold which are arranged in a split manner;

[0091] The end cover male mold includes a first male mold left end 1, a first male mold middle section 2 and a first male mold right end 3, and a first width scale line 4 is etched on the edge of the convex surface of the first male mold middle section 2;

[0092] The left end 1 of the first male mold can be converted into a left end of a first female mold of equal length and width. The middle section 2 of the first male mold can be converted into a plurality of middle sections of the first female mold of equal length and unequal width. The right end 3 of the first male mold can be converted into a right end of a first female mold of equal length and width. The left end of the first female mold, the middle section of the first female mold and the right end of the first female mold are spliced ​​together to form an end cover female mold. The end cover female mold can be converted into an end cover 100 of the underwater composite material protective cover.

[0093] The middle cover male mold includes a second male mold left end 5, a second male mold middle section 6 and a second male mold right end 7, and a second width scale line 8 is etched on the edge of the convex surface of the second male mold middle section 6;

[0094] The left end 5 of the second male mold can be turned into the left end of the second female mold of equal length and width, the middle section 6 of the second male mold can be turned into several second female mold middle sections of equal length but unequal width, the right end 7 of the second male mold can be turned into the right end of the second female mold of equal length and width, the left end of the second female mold, the middle section of the second female mold and the right end of the second female mold are spliced ​​to obtain the middle cover female mold, and the middle cover female mold can be turned into the middle cover 200 of the underwater composite material protective cover.

[0095] In the figure, x represents the width direction, and y represents the length direction; the design range of the end cover male mold length is 3-6m, and the design range of the width is 10-30m. The width design can meet the width requirements of 3-10 sets of protective covers. It can be divided into three parts along the width direction: the left end 1 of the first male mold, the middle section 2 of the first male mold, and the right end 3 of the first male mold (the middle section 2 of the first male mold is located between the two reinforcing rib positioning lines 13).

[0096] The left end 1 of the first male mold and the right end 3 of the first male mold are equal in length and width, and are approximately axially symmetrical. The middle section 2 of the first male mold meets the width requirements of 3-10 sets of protective covers. A plurality of first width scale lines 4 are etched on the edge of the middle section 2 of the first male mold. The left end 1 of the first male mold and the right end 3 of the first male mold can be respectively converted into the left end and the right end of the first female mold of equal length and width. The middle section 2 of the first male mold can be converted into several middle sections of the first female mold of equal length and unequal width (such as Figure 1 As shown, the first female mold middle section with width a1, width a2 and width a3 can be obtained. The first width scale lines 4 in the figure only give two examples. The user can use them according to needs, or decide the number of first width scale lines 4 according to their own needs, or directly use tools such as rulers to perform on-site measurements to limit the width of the first female mold middle section. The left end of the first female mold, the right end of the first female mold and the first female mold middle sections with different widths can be connected to obtain complete end cover female molds with different widths, and then the end cover female mold can be turned to obtain an end cover product (end cover of a composite material protective cover for underwater use), thereby realizing one mold for multiple systems in the width direction of the end cover male mold.

[0097] The length design range of the middle cover male mold is 3-6m, and the width design range is 10-30m. The width design can meet the width requirements of 3-10 sets of protective covers. It can be divided into three parts along the width direction: the left end 5 of the second male mold, the middle section 6 of the second male mold, and the right end 7 of the second male mold (the middle section 6 of the second male mold is located between the two reinforcement rib positioning lines 13).

[0098] The left end 5 of the second male mold and the right end 7 of the second male mold are equal in length and width, and are approximately axially symmetrical. The middle section 6 of the second male mold meets the width requirements of 3-10 sets of protective covers. A plurality of second width scale lines 8 are etched on the edge of the middle section 6 of the second male mold. The left end 5 of the second male mold and the right end 7 of the second male mold can be respectively converted into the left end and the right end of the second female mold with equal length and width. The middle section 6 of the second male mold can be converted into several middle sections of the second female mold with equal length and unequal width (such as Figure 2 As shown, the second female mold middle section with width b1, width b2 and width b3 can be obtained. The second width scale lines 8 in the figure only give two examples. The user can use them according to needs, or decide the number of second width scale lines 8 according to their own needs, or directly use tools such as rulers to conduct on-site measurements to limit the width of the second female mold middle section. The left end of the second female mold, the right end of the second female mold and the second female mold middle sections of different widths can be connected to obtain complete middle cover female molds of different widths, and then the middle cover female mold can be turned to obtain the middle cover product (the middle cover of the composite material protective cover for underwater use), thereby realizing one mold for multiple systems in the width direction of the middle cover male mold.

[0099] Wherein, a first assembly bolt hole positioning line 9 and a first support fixing frame connection bolt hole positioning line 10 are etched on the convex edge of the end cover male mold.

[0100] The end cover positive mold has a raised profile similar to that of the underwater composite material protective cover product, and bolt hole positioning lines are etched around it. One side in the width direction is the first assembly bolt hole positioning line 9, with a diameter of 24mm and a hole spacing of 300mm. Its function is to be copied and inverted on the end cover negative mold, and then copied and inverted on the end cover 100 of the underwater composite material protective cover, thereby realizing the assembly of the various parts of the underwater composite material protective cover into a complete composite material shell protective cover through bolts.

[0101] The other three sides are the first support and fixing frame connection bolt hole positioning lines 10, with a diameter of 38mm and a hole spacing of 500mm. Its function is to be reversed and imprinted on the end cover negative mold, and then reversed and imprinted on the end cover 100 of the underwater composite material protective cover, thereby realizing the connection between the oil and gas equipment support and fixing frame and the upper composite material shell protective cover through bolts.

[0102] Among them, the convex surface of the end cover positive mold is etched with a lifting ear hole positioning line 11 and / or a guide column positioning line 12 and / or a reinforcement rib positioning line 13 and / or a hose end positioning line 14 and / or an ROV gripper positioning line 15 and / or a locking hatch positioning line 16; the above-mentioned positioning lines function to be copied and inverted on the end cover negative mold, and then copied and inverted on the end cover 100 of the underwater composite material protective cover, thereby making it easier to install the various components of the end cover 100 of the underwater composite material protective cover in the later stage.

[0103] The convex edge of the middle cover male mold is etched with a second assembly bolt hole positioning line 17 and a second support fixing frame connection bolt hole positioning line 18.

[0104] On both sides of the width direction of the middle cover positive mold are the first assembly bolt hole positioning lines 17, with a diameter of 24mm and a hole spacing of 300mm. Its function is to be copied and inverted on the middle cover negative mold, and then copied and inverted on the middle cover 200 of the underwater composite material protective cover, so as to realize the assembly of the various parts of the underwater composite material protective cover into a complete composite material shell protective cover through bolts.

[0105] On both sides of the length direction are the second support fixing frame connection bolt hole positioning lines 18, with a diameter of 38mm and a hole spacing of 500mm. Its function is to be reversed and printed on the middle cover negative mold, and then reversed and printed on the middle cover 200 of the underwater composite material protective cover, so as to realize the connection between the oil and gas equipment support fixing frame and the upper composite material shell protective cover through bolts.

[0106] Among them, the inspection hatch positioning line 19 and / or the reinforcement rib positioning line 13 are etched on the convex surface of the middle cover positive mold; the above-mentioned positioning lines are used to be copied and inverted on the end cover negative mold, and then copied and inverted on the middle cover 200 of the underwater composite material protective cover, thereby making it easier to install various components of the middle cover 200 of the underwater composite material protective cover in the later stage.

[0107] The present invention provides a modular preparation method for an underwater composite material protective cover, which is prepared using the above-mentioned underwater composite material protective cover mold, and includes the following steps:

[0108] Step S1, remaking the end cover female mold in sections;

[0109] The left end of the first female mold is copied on the left end 1 of the first male mold of the end cover male mold; the middle section of the first female mold of the selected width is copied on the middle section 2 of the first male mold of the end cover male mold according to the width requirement of the product end cover; the right end of the first female mold is copied on the right end 3 of the first male mold of the end cover male mold;

[0110] Step S2, splicing the end cover female mold;

[0111] Splicing the left end of the first female mold, the middle section of the first female mold, and the right end of the first female mold to obtain an end cover female mold;

[0112] The specific steps include:

[0113] Covering the back of the joint seam: After the end cover female mold is turned over in sections on the end cover male mold, the left end of the turned first female mold, the middle section of the first female mold, and the right end of the first female mold are sequentially connected, and the back of the joint seam between the left end of the first female mold and the middle section of the first female mold, and the back of the joint seam between the middle section of the first female mold and the right end of the first female mold are respectively covered with fiberglass cloth or aluminum foil;

[0114] Filling the joints: filling the joints between the left end of the first female mold and the middle section of the first female mold, and the joints between the middle section of the first female mold and the right end of the first female mold with materials, and heating and curing them;

[0115] The filling material is a uniform mixture of chopped multiaxial fiberglass cloth (fiberglass cloth), resin, and white carbon black, with the ratio of resin (without curing agent): multiaxial fiberglass cloth: white carbon black = 100:20-50:10-30; the joints are densely filled, covered with release cloth, and heated with an electric blanket until solidified;

[0116] Splicing seam cloth laying: tear off the above-mentioned release cloth, grind the slopes on both sides of each splicing seam filler, lay multi-axial fiberglass cloth, the height of which should be 2-5 layers higher than the surface position. The width of the cloth layers should be consistent with the width of the grinded slope of the splicing seam filler. The width of the outermost 2-3 layers of cloth should be 10mm larger than the slopes on both sides of the splicing seam. Lay the pouring auxiliary materials and cover with vacuum bag film.

[0117] After tearing off the above-mentioned release cloth, use 80# sandpaper to roughen the smooth surface, grind a certain width of slope along both sides of each joint filler, lay multi-axial fiberglass cloth, and make it 2-5 layers higher than the mold surface. The width of the cloth layers should be consistent with the width of the grinded slope on both sides of each joint filler. The width of the outermost 2-3 layers of cloth should be 10mm larger than the slope on both sides of the joint. Lay the casting auxiliary materials and cover with vacuum bag film.

[0118] Air tightness test of joints: Wrap with the first vacuum, connect the nylon tube at the injection port to a mercury vacuum gauge, and connect the air extraction port to a vacuum pump to extract air; when the mercury gauge is pumped to ≤10mbar, start wrapping with the second vacuum; after the second vacuum coating is completed, pump the second vacuum to maintain the first vacuum;

[0119] Joint perfusion: perfuse resin into the glass fiber cloth, and use the negative pressure of the vacuum bag film to completely infiltrate the fiber cloth layer of the multi-axial glass fiber cloth with resin;

[0120] Joint curing: Lay an electric blanket to heat and cure, and demould after curing;

[0121] Grinding and shaping the joint seam: After rough grinding, fine grinding and fine grinding, the left end of the first female mold, the middle section of the first female mold and the right end of the first female mold are spliced ​​to obtain the end cover female mold;

[0122] Step S3, the end cover 100 of the underwater composite material protective cover is turned over (turned over twice to obtain two end covers of the underwater composite material protective cover);

[0123] The end cover 100 of the underwater composite material protective cover is obtained by replicating the end cover female mold;

[0124] Step S4, remaking the middle cover female mold in sections;

[0125] The left end of the second female mold is turned over on the left end 5 of the second male mold of the middle cover male mold; the middle section of the second female mold of the selected width is turned over on the middle section 6 of the second male mold of the middle cover male mold according to the width requirement of the middle cover of the product; the right end of the second female mold is turned over on the right end 7 of the second male mold of the middle cover male mold;

[0126] Step S5, splicing the middle cover female mold;

[0127] Splicing the left end of the second female mold, the middle section of the second female mold and the right end of the second female mold to obtain a middle cover female mold;

[0128] Specifically include the following steps:

[0129] Covering the back of the joint: After the middle cover female mold is remade in sections on the middle cover male mold, the left end of the remade second female mold, the middle section of the second female mold, and the right end of the second female mold are sequentially connected, and the back of the joint between the left end of the second female mold and the middle section of the second female mold, and the back of the joint between the middle section of the second female mold and the right end of the second female mold are respectively covered with fiberglass cloth or aluminum foil;

[0130] Filling the joints: filling the joints between the left end of the second female mold and the middle section of the second female mold, and between the middle section of the second female mold and the right end of the second female mold with materials, and heating and curing them;

[0131] The filling material is a uniform mixture of chopped multiaxial fiberglass cloth (fiberglass cloth), resin, and white carbon black, with the ratio of resin (without curing agent): multiaxial cloth fiberglass: white carbon black = 100:20-50:10-30; the joints are densely filled, covered with release cloth, and heated with an electric blanket until solidified;

[0132] Splicing seam cloth laying: tear off the above-mentioned release cloth, grind the slopes on both sides of each splicing seam filler, lay multi-axial fiberglass cloth, the height of which should be 2-5 layers higher than the surface position. The width of the cloth layers should be consistent with the width of the grinded slope of the splicing seam filler. The width of the outermost 2-3 layers of cloth should be 10mm larger than the slopes on both sides of the splicing seam. Lay the pouring auxiliary materials and cover with vacuum bag film.

[0133] After tearing off the above-mentioned release cloth, use 80# sandpaper to roughen the smooth surface, grind a certain width of slope along both sides of each joint filler, lay multi-axial fiberglass cloth, and make it 2-5 layers higher than the mold surface. The width of the cloth layers should be consistent with the width of the grinded slope on both sides of each joint filler. The width of the outermost 2-3 layers of cloth should be 10mm larger than the slope on both sides of the joint. Lay the casting auxiliary materials and cover with vacuum bag film.

[0134] Air tightness test of joints: Wrap with the first vacuum, connect the nylon tube at the injection port to a mercury vacuum gauge, and connect the air extraction port to a vacuum pump to extract air; when the mercury gauge is pumped to ≤10mbar, start wrapping with the second vacuum; after the second vacuum coating is completed, pump the second vacuum to maintain the first vacuum;

[0135] Joint perfusion: perfuse resin into the glass fiber cloth, and use the negative pressure of the vacuum bag film to completely infiltrate the fiber cloth layer of the multi-axial glass fiber cloth with resin;

[0136] Joint curing: Lay an electric blanket to heat and cure, and demould after curing;

[0137] Grinding and shaping the joint seam: After rough grinding, fine grinding and fine grinding, the left end of the second female mold, the middle section of the second female mold and the right end of the second female mold are spliced ​​to obtain the middle cover female mold;

[0138] Step S6, remaking the middle cover of the underwater composite material protective cover;

[0139] The middle cover 200 of the underwater composite material protective cover is obtained by replicating the middle cover female mold;

[0140] Step S7, splicing with composite material protective cover underwater;

[0141] The end cover 100 of the underwater composite material protective cover and the middle cover 200 of the underwater composite material protective cover are spliced ​​together to obtain the underwater composite material protective cover.

[0142] like Figure 5 As shown, the end covers 100 of the underwater composite material protective cover (there are two, respectively at the left and right ends of the protective cover) and the middle cover 200 of the underwater composite material protective cover (at least one, located in the middle of the protective cover, when there are multiple middle covers of the underwater composite material protective cover, the multiple middle covers of the underwater composite material protective cover are also spliced ​​by bolts) are spliced ​​by bolts to obtain the underwater composite material protective cover, wherein the bolt connection structure adopts Figure 5The double-row bolt structure shown in the figure can be used to connect the first assembly bolt hole 101 and the second assembly bolt hole 201 with bolts. A groove is set at the end of the end cover 100, and the first assembly bolt hole 101 is located in the groove. After the end cover 100 and the middle cover 200 are connected, the outer walls of the two are flush. The purpose of the groove design is to make the outer wall of the underwater composite material protective cover more flat and beautiful, and to avoid the risk of being dragged by fishing nets (the connection between the middle covers of multiple underwater composite material protective covers, between adjacent middle covers, and one end of one of the middle covers also adopts a groove structure).

[0143] Example 2

[0144] like Figure 3 and 4 As shown, the present invention provides an underwater composite material protective cover mold, which includes an end cover positive mold and a middle cover positive mold that are separately arranged;

[0145] The end cover positive mold can be turned into an end cover negative mold of equal length and width, and the end cover negative mold can be turned into the end cover 100 of the underwater composite material protective cover;

[0146] The convex surface of the middle cover positive mold is etched with several second assembly bolt hole positioning lines 17 in the length direction. The middle cover positive mold can be reproduced to obtain several middle cover negative molds of equal width and unequal length. The middle cover negative mold can be reproduced to obtain the middle cover 200 of the underwater composite material protective cover.

[0147] The convex edge of the middle cover male mold is etched with a second assembly bolt hole positioning line 17 and a second support fixing frame connection bolt hole positioning line 18.

[0148] The middle cover positive mold is in the shape of a boss, with a design range of 3-6m in length and 10-30m in width. The length design can meet the width requirements of 3-10 sets of protective covers. Among them, both sides in the length direction are the second support fixing frame connection bolt hole positioning lines 18, with a diameter of 38mm and a hole spacing of 500mm. Its function is to be copied and inverted on the middle cover negative mold, and then copied and inverted on the middle cover 200 of the underwater composite material protective cover, so as to realize the connection between the oil and gas equipment support fixing frame and the upper composite material shell protective cover through bolts.

[0149] There are 3-10 second assembly bolt hole positioning lines 17 on the middle cover male mold, for example Figure 4As shown in the four lines A, B, C, and D, the second assembly bolt hole positioning lines 17 of lines A and D are located on the convex edge of the middle cover male mold. The middle cover female mold with the maximum length can be reproduced based on the two. The second assembly bolt hole positioning lines 17 except for line A are located in the groove formed by the 45° chamfer and the 135° chamfer. The four lines A, B, C, and D can be reproduced to produce middle cover female molds of different lengths such as |AB|, |AC|, and |AD|. The secondary reproduction can obtain middle cover 200 products of different lengths, thereby realizing one mold for multiple production in the length direction of the middle cover male mold.

[0150] Among them, the convex surface of the middle cover positive mold is etched with an inspection door positioning line 19 and / or a reinforcement rib positioning line 13. The above-mentioned positioning lines are used to be reversed and printed on the end cover negative mold, and then reversed and printed on the middle cover 200 of the underwater composite material protective cover, thereby making it easier to install various components of the middle cover 200 of the underwater composite material protective cover in the later stage.

[0151] Wherein, a first assembly bolt hole positioning line 9 and a first support fixing frame connection bolt hole positioning line 10 are etched on the convex edge of the end cover male mold.

[0152] The end cover positive mold has a raised profile similar to that of the underwater composite material protective cover product, and bolt hole positioning lines are etched around it. One side in the width direction is the first assembly bolt hole positioning line 9, with a diameter of 24mm and a hole spacing of 300mm. Its function is to be copied and inverted on the end cover negative mold, and then copied and inverted on the end cover 100 of the underwater composite material protective cover, thereby realizing the assembly of the various parts of the underwater composite material protective cover into a complete composite material shell protective cover through bolts.

[0153] The other three sides are the first support and fixing frame connection bolt hole positioning lines 10, with a diameter of 38mm and a hole spacing of 500mm. Its function is to be reversed and imprinted on the end cover negative mold, and then reversed and imprinted on the end cover 100 of the underwater composite material protective cover, thereby realizing the connection between the oil and gas equipment support and fixing frame and the upper composite material shell protective cover through bolts.

[0154] Among them, the convex surface of the end cover positive mold is etched with a lifting ear hole positioning line 11 and / or a guide column positioning line 12 and / or a reinforcement rib positioning line 13 and / or a hose end positioning line 14 and / or an ROV gripper positioning line 15 and / or a locking hatch positioning line 16; the above-mentioned positioning lines function to be copied and inverted on the end cover negative mold, and then copied and inverted on the end cover 100 of the underwater composite material protective cover, thereby making it easier to install the various components of the end cover 100 of the underwater composite material protective cover in the later stage.

[0155] The present invention provides a modular preparation method for an underwater composite material protective cover, which is prepared using the above-mentioned underwater composite material protective cover mold, and includes the following steps:

[0156] Step S1, remaking the end cover female mold;

[0157] Turning the end cover female mold on the end cover male mold;

[0158] Step S2, the end cover 100 of the underwater composite material protective cover is turned over (turned over twice to obtain two end covers of the underwater composite material protective cover);

[0159] The end cover 100 of the underwater composite material protective cover is obtained by replicating the end cover female mold;

[0160] Step S3, remaking the middle cover female mold;

[0161] According to the length requirement of the middle cover of the product, a middle cover female mold of the selected length is made on the middle cover male mold;

[0162] Step S4, remaking the middle cover 200 of the underwater composite material protective cover;

[0163] The middle cover 200 of the underwater composite material protective cover is obtained by replicating the middle cover female mold;

[0164] Step S5, splicing with composite material protective cover underwater;

[0165] The end cover 100 of the underwater composite material protective cover and the middle cover 200 of the underwater composite material protective cover are spliced ​​together to obtain the underwater composite material protective cover.

[0166] like Figure 5 As shown, the end covers 100 of the underwater composite material protective cover (there are two, respectively at the left and right ends of the protective cover) and the middle cover 200 of the underwater composite material protective cover (at least one, located in the middle of the protective cover, when there are multiple middle covers of the underwater composite material protective cover, the multiple middle covers of the underwater composite material protective cover are also spliced ​​by bolts) are spliced ​​by bolts to obtain the underwater composite material protective cover, wherein the bolt connection structure adopts Figure 5The double-row bolt structure shown in the figure can be used to connect the first assembly bolt hole 101 and the second assembly bolt hole 201 with bolts. A groove is set at the end of the end cover 100, and the first assembly bolt hole 101 is located in the groove. After the end cover 100 and the middle cover 200 are connected, the outer walls of the two are flush. The purpose of the groove design is to make the outer wall of the underwater composite material protective cover more flat and beautiful, and to avoid the risk of being dragged by fishing nets (the connection between the middle covers of multiple underwater composite material protective covers, between adjacent middle covers, and one end of one of the middle covers also adopts a groove structure).

[0167] Example 3

[0168] This embodiment integrates embodiment 1 and embodiment 2, and simultaneously etches the first width scale line 4, the second width scale line 8, and the first assembly bolt hole positioning line 17 on a set of positive molds, so that the positive mold can be used for multiple production in both length and width directions, further saving manufacturing costs.

[0169] The method for splicing the modules of the end cover 100 and the middle cover 200 of the underwater composite material protective cover reproduced in this application in the longitudinal direction is as follows:

[0170] The modules of the underwater composite material protective cover end cover 100 and the underwater composite material protective cover middle cover 200 are overlapped, the overall thickness of the overlapped part is twice the thickness of the fiberglass reinforced plastic main body, and are connected by double-row bolts.

[0171] Due to the ultra-width restriction of road transportation, the design length of the end cover and the middle cover of the underwater composite material protective cover is generally less than 6m. If the overall size of the protective cover is longer, the length direction of the protective cover can be adjusted by increasing the number of sections of the intermediate cover product and splicing and installing it on site.

[0172] The mold of the present application includes two types: a positive mold and a negative mold. The positive mold is divided into two parts: an end cover positive mold and a middle cover positive mold. Both have a raised contour similar to the protective cover product. The length, width, height and inclination of the positive mold can be uniformly designed according to the specifications and structural characteristics of multiple sets of protective cover products. The structural positioning information of several sets of protective covers of different specifications are integrated thereon, and identification positioning lines such as inspection hatches, locking hatches, ROV grippers and lifting ear structures are etched thereon.

[0173] The female mold can be selectively converted into several modules of different lengths and widths by the male mold, and its outline is concave. The female mold modules can be selectively replaced and assembled to produce protective cover products of different lengths and widths. The present invention utilizes a set of male molds to segmentally convert female molds of different modules, and freely switches and assembles modules to achieve directional changes in the length and width of the protective cover products, thereby saving mold investment costs and reducing the protective cover design and production line manufacturing cycle, so that the protective cover production line can be quickly switched according to market changes.

[0174] At present, once the original composite material underwater protective cover is designed and determined, the size and specifications are finalized. The manufactured male and female molds cannot be used for multiple purposes. In the face of diversified market demands, new molds can only be designed and opened continuously, resulting in waste of mold costs and space.

[0175] The present invention integrates the product structural features of multiple sets of protective covers into one design, and uses a set of positive molds to modularly produce composite material protective covers of various specifications and sizes, thereby realizing the centralized unification of modularization, standardization, functionality, high efficiency and low cost of composite material protective covers.

[0176] The modular splicing of female molds is used to achieve on-demand switching in the width direction, and the modular splicing of products is used to achieve directional extension in the length direction. The overall size and style of protective covers of multiple specifications are controllable and adjustable, and there is no additional cost for style changes. It can reduce costs and increase efficiency while effectively improving market competitiveness.

[0177] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, ordinary technicians in this field can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention. Any technician familiar with this technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should all be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A composite material protective cover mold for underwater use, characterized in that: It includes an end cover male mold and a middle cover male mold which are arranged in a split manner; The end cover male mold comprises a first male mold left end (1), a first male mold middle section (2) and a first male mold right end (3), and a first width scale line (4) is provided on the edge of the convex surface of the first male mold middle section (2); The left end (1) of the first male mold can be turned into a left end of a first female mold of equal length and width, the middle section (2) of the first male mold can be turned into a plurality of middle sections of the first female mold of equal length and unequal width, the right end (3) of the first male mold can be turned into a right end of a first female mold of equal length and width, the left end of the first female mold, the middle section of the first female mold and the right end of the first female mold are spliced ​​together to form an end cover female mold, and the end cover female mold can be turned into an end cover (100) of the underwater composite material protective cover; The middle cover male mold comprises a second male mold left end (5), a second male mold middle section (6) and a second male mold right end (7), and a second width scale line (8) is provided on the edge of the convex surface of the second male mold middle section (6); The left end (5) of the second male mold can be turned into the left end of the second female mold of equal length and width, the middle section (6) of the second male mold can be turned into a plurality of middle sections of the second female mold of equal length but unequal width, the right end (7) of the second male mold can be turned into the right end of the second female mold of equal length and width, the left end of the second female mold, the middle section of the second female mold and the right end of the second female mold are spliced ​​together to form a middle cover female mold, and the middle cover female mold can be turned into a middle cover (200) of the underwater composite material protective cover; A first assembly bolt hole positioning line (9) and a first support fixing frame connection bolt hole positioning line (10) are provided on the convex edge of the end cover male mold; a second assembly bolt hole positioning line (17) and a second support fixing frame connection bolt hole positioning line (18) are provided on the convex edge of the middle cover male mold.

2. The underwater composite material protective cover mold according to claim 1, characterized in that: The convex surface of the end cover male mold is provided with a lifting ear hole positioning line (11) and / or a guide column positioning line (12) and / or a reinforcing rib positioning line (13) and / or a hose end positioning line (14) and / or an ROV gripper positioning line (15) and / or a locking hatch positioning line (16); the convex surface of the middle cover male mold is provided with an inspection hatch positioning line (19) and / or a reinforcing rib positioning line (13).

3. A modular preparation method for an underwater composite material protective cover, characterized in that: The underwater composite material protective cover mold according to claim 1 is used for preparation, comprising the following steps: Step S1, remaking the end cover female mold in sections; The left end of the first female mold is formed on the left end (1) of the first male mold of the end cover male mold; the middle section of the first female mold of the selected width is formed on the middle section (2) of the first male mold of the end cover male mold according to the width dimension requirement of the product end cover; the right end of the first female mold is formed on the right end (3) of the first male mold of the end cover male mold; Step S2, splicing the end cover female mold; Splicing the left end of the first female mold, the middle section of the first female mold, and the right end of the first female mold to obtain an end cover female mold; Step S3, remaking the end cover (100) of the composite material protective cover underwater; The end cover (100) of the underwater composite material protective cover is obtained by forming the end cover female mold; Step S4, remaking the middle cover female mold in sections; The left end of the second female mold is turned over on the left end (5) of the second male mold of the middle cover male mold; the middle section of the second female mold of the selected width is turned over on the middle section (6) of the second male mold of the middle cover male mold according to the width dimension requirement of the middle cover of the product; the right end of the second female mold is turned over on the right end (7) of the second male mold of the middle cover male mold; Step S5, splicing the middle cover female mold; Splicing the left end of the second female mold, the middle section of the second female mold and the right end of the second female mold to obtain a middle cover female mold; Step S6, remaking the middle cover (200) of the underwater composite material protective cover; The middle cover (200) of the underwater composite material protective cover is obtained by turning the middle cover female mold on the middle cover; Step S7, splicing with composite material protective cover underwater; The end cover (100) of the underwater composite material protective cover and the middle cover (200) of the underwater composite material protective cover are spliced ​​to obtain the underwater composite material protective cover.

4. The modular preparation method of the underwater composite material protective cover according to claim 3, characterized in that: The end cover female mold splicing in step S2 includes the following steps: Covering the back of the joint seam: After the end cover female mold is turned over in sections on the end cover male mold, the left end of the turned first female mold, the middle section of the first female mold, and the right end of the first female mold are sequentially connected, and the back of the joint seam between the left end of the first female mold and the middle section of the first female mold, and the back of the joint seam between the middle section of the first female mold and the right end of the first female mold are respectively covered with fiberglass cloth or aluminum foil; Filling the joints: filling the joints between the left end of the first female mold and the middle section of the first female mold, and the joints between the middle section of the first female mold and the right end of the first female mold with materials, and heating and curing them; Splicing seam paving: Place fiberglass cloth on both sides of each splicing seam filler, place the pouring auxiliary material, and cover with vacuum bag film; Joint filling: Fill the fiberglass cloth with resin to soak the fiberglass cloth with resin; The joint seam is solidified by heating and solidifying, and demoulding is performed after solidification is completed. The left end of the first female mold, the middle section of the first female mold and the right end of the first female mold are spliced ​​together to obtain an end cover female mold.

5. The modular preparation method of the underwater composite material protective cover according to claim 3, characterized in that: The middle cover female mold splicing in step S5 includes the following steps: Covering the back of the joint: After the middle cover female mold is remade in sections on the middle cover male mold, the left end of the remade second female mold, the middle section of the second female mold, and the right end of the second female mold are sequentially connected, and the back of the joint between the left end of the second female mold and the middle section of the second female mold, and the back of the joint between the middle section of the second female mold and the right end of the second female mold are respectively covered with fiberglass cloth or aluminum foil; Filling the joints: filling the joints between the left end of the second female mold and the middle section of the second female mold, and between the middle section of the second female mold and the right end of the second female mold with materials, and heating and curing them; Splicing seam paving: Place fiberglass cloth on both sides of each splicing seam filler, place the pouring auxiliary material, and cover with vacuum bag film; Joint filling: Fill the fiberglass cloth with resin to soak the fiberglass cloth with resin; The joint seam is cured by heating and curing, and demoulding is performed after the curing is completed. The left end of the second female mold, the middle section of the second female mold and the right end of the second female mold are spliced ​​together to obtain a middle cover female mold.

6. A composite material protective cover mold for underwater use, characterized in that: It includes an end cover male mold and a middle cover male mold which are arranged in a split manner; The end cover positive mold can be turned over to obtain an end cover negative mold of equal length and width, and the end cover negative mold can be turned over to obtain an end cover (100) of the underwater composite material protective cover; The convex surface of the middle cover positive mold is provided with a plurality of second assembly bolt hole positioning lines (17) in the longitudinal direction. The middle cover positive mold can be remade into a plurality of middle cover negative molds of equal width and unequal length. The middle cover negative mold can be remade into the middle cover (200) of the underwater composite material protective cover. A first assembly bolt hole positioning line (9) and a first support fixing frame connection bolt hole positioning line (10) are provided on the convex edge of the end cover male mold; a second assembly bolt hole positioning line (17) and a second support fixing frame connection bolt hole positioning line (18) are provided on the convex edge of the middle cover male mold.

7. The underwater composite material protective cover mold according to claim 6, characterized in that: The convex surface of the end cover male mold is provided with a lifting ear hole positioning line (11) and / or a guide column positioning line (12) and / or a reinforcing rib positioning line (13) and / or a hose end positioning line (14) and / or an ROV gripper positioning line (15) and / or a locking hatch positioning line (16); the convex surface of the middle cover male mold is provided with an inspection hatch positioning line (19) and / or a reinforcing rib positioning line (13).

8. A modular preparation method for underwater composite material protective cover, characterized in that: The underwater composite material protective cover mold according to claim 6 is used for preparation, comprising the following steps: Step S1, remaking the end cover female mold; Turning the end cover female mold on the end cover male mold; Step S2, remaking the end cover (100) of the underwater composite material protective cover; The end cover (100) of the underwater composite material protective cover is obtained by forming the end cover female mold; Step S3, remaking the middle cover female mold; According to the length requirement of the middle cover of the product, a middle cover female mold of the selected length is made on the middle cover male mold; Step S4, remaking the middle cover (200) of the underwater composite material protective cover; The middle cover (200) of the underwater composite material protective cover is obtained by turning the middle cover female mold on the middle cover; Step S5, splicing with composite material protective cover underwater; The end cover (100) of the underwater composite material protective cover and the middle cover (200) of the underwater composite material protective cover are spliced ​​to obtain the underwater composite material protective cover.

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