Special fixing jig for cutting off sand blasting pipe-sand sweeping pipe of methanol dual-fuel container ship

Abstract

The invention discloses a special fixing jig for cutting off a sand blasting pipe and a sand sweeping pipe of a methanol dual-fuel container ship, and belongs to the technical field of ship manufacturing. The jig comprises a support mechanism, a pipe supporting mechanism, a protection mechanism and a stabilizing mechanism, an integrated support is matched with a U-shaped frame, the U-shaped frame can support a hose, and the hose is automatically locked through a corrugated groove and a corner bayonet of the hose. The fixture pertinently solves the problems of fixation and confusion prevention of cut-off of the sand blasting / sand sweeping pipe of the methanol dual-fuel container, has the characteristics of simple structure, low cost and high practicability, and can be popularized to cut-off operation scenes of similar flexible pipes.

Description

TECHNICAL FIELD

[0001] The application relates to a special fixing jig for cutting off a sand blasting pipe and a sand return pipe of a methanol dual-fuel container ship, and belongs to the technical field of ship manufacturing. BACKGROUND

[0002] In the sand blasting operation of the methanol dual-fuel container, the sand blasting pipe (for conveying sand blasting medium) and the sand return pipe (for recycling sand) need to be regularly cut off and replaced. The existing operation has the following defects: the sand blasting pipe and the sand return pipe are flexible hoses, which are easy to slide when manually fixed, resulting in poor cutting precision (inclined cut), low efficiency, and even causing the safety hazard of tool scratching the operator. In addition, the sand blasting pipe and the sand return pipe have different functions and similar appearances, and manual operation is easy to misjudge the pipe type, affecting the consistency of the maintenance process. At present, there is a lack of special fixing jig for the two in the industry, relying on general clamps or manual fixing, which cannot meet the efficient and safe operation requirements. SUMMARY

[0003] In order to solve the problem that the sand blasting pipe and the sand return pipe used in the segmented sand blasting and sand return operation of the methanol dual-fuel ship need to be replaced, due to the flexibility of the pipe, the personnel cannot stably fix it by hand, and it is easy to be hurt when cutting off, the efficiency is low, and the cutting precision is poor, which easily leads to uneven broken surface and affects the use. The application provides a special fixing jig for cutting off the sand blasting pipe and the sand return pipe of the methanol dual-fuel container ship, which can improve the safety of cutting operation, improve the cutting efficiency, and effectively distinguish the sand blasting pipe and the sand return pipe, and is convenient to operate.

[0004] The technical scheme adopted by the application is as follows: a special fixing jig for cutting off the sand blasting pipe and the sand return pipe of the methanol dual-fuel container ship, comprising a support mechanism, a pipe support mechanism, a protection mechanism and a stabilizing mechanism. The support mechanism comprises a first H-shaped support on which a first upper layer plate is arranged, a second H-shaped support on which a second upper layer plate is arranged, and a reinforcing cross beam arranged between the first H-shaped support and the second H-shaped support; a support cross beam is arranged below the first upper layer plate and the second upper layer plate. The pipe support mechanism comprises a first sand blasting pipe U-shaped frame and a first sand return pipe U-shaped frame arranged on the first upper layer plate, and a second sand blasting pipe U-shaped frame and a second sand return pipe U-shaped frame arranged on the second upper layer plate; the first sand blasting pipe U-shaped frame, the first sand return pipe U-shaped frame, the second sand blasting pipe U-shaped frame and the second sand return pipe U-shaped frame all adopt a U-shaped frame structure, the U-shaped frame structure adopts an arc-shaped corner section and two open straight sections at both ends, and the threaded groove of the sand blasting pipe or the sand return pipe is clamped at the arc-shaped corner section. The protection mechanism comprises a first guard plate and a second guard plate arranged between the support cross beam and the reinforcing cross beam. The stabilizing mechanism comprises a forward foot pedal and a backward foot pedal, the top ends of the forward foot pedal and the backward foot pedal are arranged on the reinforcing cross beam, and the bottom ends of the forward foot pedal and the backward foot pedal are arranged on the ground.

[0005] Further, the first sand blasting pipe U-shaped bracket and the second sand blasting pipe U-shaped bracket are arranged on the same straight line and used for supporting the sand blasting pipe.

[0006] Further, the first sand blasting pipe U-shaped bracket and the second sand blasting pipe U-shaped bracket are arranged on the same straight line and used for supporting the sand blasting pipe.

[0007] Further, the forward foot pedal is arranged at the first H-shaped support, and the backward foot pedal is arranged at the second H-shaped support.

[0008] Further, the forward foot pedal is arranged at the first H-shaped support, and the backward foot pedal is arranged at the second H-shaped support.

[0009] Further, the gap distance between the first upper plate and the second upper plate is 300-400 mm, and the distance between the two open straight sections in the U-shaped bracket structure is greater than the diameter of the sand blasting pipe or the sand return pipe by 2-5 mm.

[0010] Further, the first guard plate and the second guard plate are arranged in an inclined and symmetrical manner, and the support cross beam end opening of the first guard plate and the second guard plate is greater than the reinforcing cross beam end opening of the first guard plate and the second guard plate.

[0011] Further, the top edge of the first guard plate is on a vertical line with the inner side edge of the first upper plate, and the bottom edge of the first guard plate is on a vertical line with the inner side edge of the forward foot pedal; the top edge of the second guard plate is on a vertical line with the inner side edge of the second upper plate, and the bottom edge of the second guard plate is on a vertical line with the inner side edge of the backward foot pedal.

[0012] Further, a pipeline identification area is arranged on the first upper plate and the second upper plate.

[0013] A working method of a special fixing jig for cutting a sand blasting pipe and a sand return pipe of a methanol dual-fuel container ship, specifically: Cutting of the sand return pipe: a. The operator stands on the back of the jig, puts the sand return pipe into the opening of the first sand return pipe U-shaped bracket according to the pipeline identification on the first upper plate, and clamps the corrugated groove of the sand return pipe at the arc-shaped corner section; b. The sand return pipe is straightened, and then put into the opening of the second sand return pipe U-shaped bracket according to the pipeline identification on the second upper plate, and clamp the corrugated groove of the sand return pipe at the arc-shaped corner section, at this time the sand return pipe is arranged in a horizontal suspension manner; c. The operator steps on the foot pedal facing away from the fixture to stabilize it; the operator uses a cutting tool to cut the return sand pipe located between the first and second upper plates in a vertical direction. At this time, the support beam, the first guard plate and the second guard plate provide protection for the operator to avoid cuts. Cutting of sandblasting pipe: d. The operator stands in front of the fixture and, according to the pipeline markings on the first upper plate, inserts the sandblasting pipe into the opening of the first sandblasting pipe U-shaped bracket and secures the corrugated groove of the sandblasting pipe at the arc-shaped bend. e. Straighten the sandblasting pipe, and then, according to the pipe markings on the second upper plate, insert the sandblasting pipe into the opening of the second sandblasting pipe U-shaped bracket, and secure the corrugated groove of the sandblasting pipe at the arc-shaped bend. At this time, the sandblasting pipe is suspended horizontally. f. The operator steps on the positive foot pedal to stabilize the fixture; the operator uses a cutting tool to cut the sandblasting pipe located between the first and second upper plates in a vertical direction. At this time, the support beam, the first guard plate and the second guard plate provide protection for the operator to avoid cuts.

[0014] Compared with existing technologies, this invention has the following advantages: The fixture includes a support mechanism, a pipe support mechanism, a protective mechanism, and a stabilizing mechanism. The support mechanism provides a suitable height for pipe cutting. In the pipe support mechanism, the U-shaped frame structure uses an arc-shaped bend and open straight sections at both ends. The threaded grooves of the sandblasting pipe or return pipe are engaged at the arc-shaped bend to secure the sandblasting pipe or return pipe, preventing slippage during cutting and thus avoiding injury to the operator. The protective plate in the protective mechanism prevents injury during operation. The foot pedals are arranged symmetrically in opposite directions, making it easy to stabilize the fixture by stepping on the pedals during cutting, thereby preventing injury caused by fixture instability. Additionally, the upper plate is equipped with a dedicated marking to avoid confusion between the sandblasting / return pipes. During the cutting of the return pipe and the sandblasting pipe, the operator is positioned on both sides of the fixture, placing the operator in the most convenient operating position. This fixture specifically addresses the challenges of fixing and preventing confusion when cutting sandblasting / returning pipes in methanol dual-fuel containers. It features a simple structure, low cost, and high practicality, and can be extended to similar flexible pipe cutting scenarios. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional diagram of a special fixing fixture for cutting off the sandblasting pipe and return sand pipe of a methanol dual-fuel container ship.

[0017] Figure 2 is a front view of a special fixture for cutting off sand blasting pipe and return sand pipe of methanol dual-fuel container ship.

[0018] Figure 3 is an enlarged view of the U-shaped bracket structure.

[0019] Figure 4 is a physical flow chart of the working of the fixture.

[0020] In the figure: 1, first H-shaped support, 2, second H-shaped support, 3, reinforcing cross beam, 4, first upper plate, 5, second upper plate, 6, supporting cross beam, 7, first guard plate, 8, second guard plate, 9, first sand blasting pipe U-shaped bracket, 10, first return sand pipe U-shaped bracket, 11, second sand blasting pipe U-shaped bracket, 12, second return sand pipe U-shaped bracket, 13, forward foot pedal, 14, backward foot pedal, 15, arc-shaped elbow section, 16, open straight section. DETAILED DESCRIPTION

[0021] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0024] The foregoing description, for purposes of clarity, describes the present application in terms of its components, processes and operations. Such descriptions and representations are the means used by those skilled in the art of describing the structural and functional necessities of and changes to the present application, but are not meant to limit the present application to a particular embodiment. Also, the phrases "first," "second," and the like, do not denote any order, quantity, or importance, but rather are used to nomenclature the nature of the various components and / or areas described. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0025] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like are generally based on the orientations or positional relationships shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the outline of each component.

[0026] For the purpose of description, spatial relative terms, such as "above", "upper", "top", "up", "lower", "bottom", and the like, can be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations of the devices in use or operation in addition to the orientations depicted in the drawings. For example, if a device in the drawings is turned over, the device described as "above" or "above" the other device or structure will be positioned "below" or "below" the other device or structure. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned 90 degrees or in other orientations differently, and the spatial relative description used herein should be interpreted accordingly.

[0027] In addition, it should be noted that the use of "first", "second" and the like words to qualify parts, is merely for the purpose of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0028] A kind of methanol dual-fuel container ship sand blasting pipe-sand pipe truncation special fixture, the jig includes support mechanism, pipe support mechanism, protection mechanism and stabilizing mechanism; Support mechanism includes first H-shaped support 1 on the first upper deck 4, second H-shaped support 2 on the second upper deck 5, first H-shaped support 1 and second H-shaped support 2 between the reinforcing beam 3;First upper deck 4 and the lower part of second upper deck 5 are provided with support beam 6;Pipe identification area is provided on first upper deck 4 and second upper deck 5.The gap distance of first upper deck 4 and second upper deck 5 is 300-400mm.The thickness of first upper deck 4 and second upper deck 5 is 6mm, the yield strength is 235MPa, and the cutting impact resistance is Q235 steel plate.

[0029] Pipe support mechanism includes first sand blasting pipe U-shaped frame 9 and first sand pipe U-shaped frame 10 arranged on first upper deck 4 and second sand blasting pipe U-shaped frame 11 and second sand pipe U-shaped frame 12 arranged on second upper deck 5;First sand blasting pipe U-shaped frame 9 is welded to first upper deck 4, and second sand blasting pipe U-shaped frame 11 and second sand pipe U-shaped frame 12 are welded to second upper deck 5;First sand blasting pipe U-shaped frame 9 and second sand blasting pipe U-shaped frame 11 are in the same straight line, for supporting sand blasting pipe.First sand pipe U-shaped frame 10 and second sand pipe U-shaped frame 12 are in the same straight line, for supporting sand pipe.

[0030] First sand blasting pipe U-shaped frame 9, first sand pipe U-shaped frame 10, second sand blasting pipe U-shaped frame 11 and second sand pipe U-shaped frame 12 all adopt U-shaped frame structure, U-shaped frame structure adopts arc-shaped corner section 15 and two open straight sections 16 at both ends, and the threaded groove of sand blasting pipe or sand pipe is clamped at arc-shaped corner section 15;The distance between two open straight sections 16 in U-shaped frame structure is 5mm larger than the diameter of sand blasting pipe or sand pipe.

[0031] Protection mechanism includes first baffle 7 and second baffle 8 arranged between support beam 6 and reinforcing beam 3;First baffle 7 and second baffle 8 are symmetrically arranged in an inclined manner, and the support beam end opening of first baffle 7 and second baffle 8 is larger than the reinforcing beam end opening of first baffle 7 and second baffle 8.The top edge of first baffle 7 is on a vertical line with the inner side of first upper deck 4, and the bottom edge of first baffle 7 is on a vertical line with the inner side of forward footboard 13;The top edge of second baffle 8 is on a vertical line with the inner side of second upper deck 5, and the bottom edge of second baffle 8 is on a vertical line with the inner side of backward footboard 14.Forward footboard and backward footboard are green, 5mm thick galvanized steel plate corrosion resistant.

[0032] Stabilizing mechanism includes forward footboard 13 and backward footboard 14, and the top end of forward footboard 13 and backward footboard 14 is arranged on reinforcing beam 3, and the bottom end of forward footboard 13 and backward footboard 14 acts on the ground.

[0033] The forward foot pedal 13 is arranged at the first H-shaped support 1, and the backward foot pedal 14 is arranged at the second H-shaped support 2. The forward foot pedal 13 faces the front of the jig, and the backward foot pedal 14 faces the back of the jig.

[0034] A working method of a special fixing jig for cutting off a sand return pipe and a sand blasting pipe of a methanol dual-fuel container ship, comprising cutting of the sand return pipe and cutting of the sand blasting pipe; Cutting of the sand return pipe: a. The operator stands at the back of the jig, puts the sand return pipe into the opening of the first sand return pipe U-shaped bracket 10 according to the pipe identification on the first upper layer plate 4, and clamps the corrugated groove of the sand return pipe at the arc-shaped corner section 15; b. The sand return pipe is straightened, and then put into the opening of the second sand return pipe U-shaped bracket 12 according to the pipe identification on the second upper layer plate 5, and the corrugated groove of the sand return pipe is clamped at the arc-shaped corner section 15, at this time the sand return pipe is horizontally hung; c. The operator steps on the backward foot pedal 14 to stabilize the jig; the cutting tool is used to cut the sand return pipe in the gap between the first upper layer plate 4 and the second upper layer plate 5 in the vertical direction, at this time the support beam 6, the first guard plate 7 and the second guard plate 8 provide protection for the operator to avoid being cut; Cutting of the sand blasting pipe: d. The operator stands at the front of the jig, puts the sand blasting pipe into the opening of the first sand blasting pipe U-shaped bracket 9 according to the pipe identification on the first upper layer plate 4, and clamps the corrugated groove of the sand blasting pipe at the arc-shaped corner section 15; e. The sand blasting pipe is straightened, and then put into the opening of the second sand blasting pipe U-shaped bracket 11 according to the pipe identification on the second upper layer plate 5, and the corrugated groove of the sand blasting pipe is clamped at the arc-shaped corner section 15, at this time the sand blasting pipe is horizontally hung; f. The operator steps on the forward foot pedal 13 to stabilize the jig; the cutting tool is used to cut the sand blasting pipe in the gap between the first upper layer plate 4 and the second upper layer plate 5 in the vertical direction, at this time the support beam 6, the first guard plate 7 and the second guard plate 8 provide protection for the operator to avoid being cut.

[0035] The main body support of the tool is an integral metal structure, which is formed by welding steel plates and has sufficient strength to support the weight of the hose and the cutting impact. The surface is coated with yellow anticorrosive paint to enhance recognition and corrosion resistance. The bottom is equipped with an inclined pedal that can be stepped on with one foot, improving the stability of the tool. The middle has two baffles to prevent injury to the hands during cutting. The identification component has a white identification plate at the corresponding position of the main body, with black text "sand blasting pipe" and "sand return pipe" printed on it, clearly distinguishing the pipe types. A U-shaped metal hook is welded at the corresponding identification position, with the opening width of the hook adapted to the outer diameter of the target hose to ensure smooth hanging and no sliding.

[0036] The main body bottom can be provided with fixing holes to be fixed on the workbench by bolts, or directly placed on a flat table to be fixed by gravity. The hook spacing and height are optimized to make the hose naturally sag after hanging, avoiding wrinkles that affect cutting.

[0037] The first upper layer plate 4 and the second upper layer plate 5 are both provided with sand blasting pipe and sand return pipe identification plates, which are made of oil-resistant PVC plates with a thickness of 3mm. The black text is engraved with Arial Bold font with a size of 16pt, and the surface is covered with transparent wear-resistant material. The left identification plate is arranged in the forward direction for the standing perspective of the operator, and the right identification plate is arranged in the reverse direction with the text facing forward when actually observed, ensuring that the identification is clear and readable regardless of which side the person stands on. The identification corresponds one-to-one with the U-shaped bracket: the left hook corresponds to "sand return pipe", and the right hook corresponds to "sand blasting pipe". The right side is mirror-imaged, forcing the pipe type to be bound to the hook, thus eliminating the risk of mis-hanging from a physical space.

[0038] The U-shaped bracket structure is an improved U-shaped structure with an opening and a bend φ5mm round steel hot bending, and the design parameters are optimized through mechanical simulation: the opening size is set to 85mm for target hoses such as φ80mm corrugated hoses, which is 5mm larger than the outer diameter of the hose, providing a loose opening for easy and fast hanging with gloves. When the sand blasting pipe and the sand return pipe sag under their own weight, the bend is stuck in the corrugated groove, eliminating the risk of sliding out caused by cutting vibration. The two U-shaped bracket structures support the hose to hang horizontally, avoiding bending deformation caused by single-sided hanging and ensuring that the cutting section axis is straight. The U-shaped bracket limits axial displacement, ensuring that the cutting edge is perpendicular to the pipe axis.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A special fixing fixture for cutting off the sandblasting pipe and return sand pipe of a methanol dual-fuel container ship, characterized in that: The jig comprises a support mechanism, a pipe support mechanism, a protection mechanism and a stabilizing mechanism; The support mechanism comprises a first H-shaped support (1) provided with a first upper layer plate (4), a second H-shaped support (2) provided with a second upper layer plate (5), and a reinforcing crossbeam (3) arranged between the first H-shaped support (1) and the second H-shaped support (2); a support crossbeam (6) is arranged below the first upper layer plate (4) and the second upper layer plate (5); The pipe support mechanism comprises a first sandblasting pipe U-shaped bracket (9) and a first sand return pipe U-shaped bracket (10) arranged on the first upper layer plate (4), and a second sandblasting pipe U-shaped bracket (11) and a second sand return pipe U-shaped bracket (12) arranged on the second upper layer plate (5); the first sandblasting pipe U-shaped bracket (9), the first sand return pipe U-shaped bracket (10), the second sandblasting pipe U-shaped bracket (11) and the second sand return pipe U-shaped bracket (12) all adopt a U-shaped bracket structure, the U-shaped bracket structure adopts an arc-shaped corner segment (15) and two open straight segments (16) at both ends, and a threaded groove of a sandblasting pipe or a sand return pipe is clamped at the arc-shaped corner segment (15); The protection mechanism comprises a first guard plate (7) and a second guard plate (8) arranged between the support crossbeam (6) and the reinforcing crossbeam (3); The stabilizing mechanism comprises a forward foot pedal (13) and a backward foot pedal (14), the top ends of the forward foot pedal (13) and the backward foot pedal (14) are arranged on the reinforcing crossbeam (3), and the bottom ends of the forward foot pedal (13) and the backward foot pedal (14) act on the ground.

2. The sand blasting pipe-sand return pipe cutting-off special fixture for a methanol dual-fuel container ship according to claim 1, characterized in that: The first sandblasting pipe U-shaped bracket (9) and the second sandblasting pipe U-shaped bracket (11) are on the same straight line and are used for supporting a sandblasting pipe.

3. The sand blasting pipe-sand return pipe cutting-off special fixture for a methanol dual-fuel container ship according to claim 2, characterized in that: The first sand return pipe U-shaped bracket (10) and the second sand return pipe U-shaped bracket (12) are on the same straight line and are used for supporting a sand return pipe.

4. The sand blasting pipe-sand return pipe cutting-off special fixture for a methanol dual-fuel container ship according to claim 3, characterized in that: The forward foot pedal (13) is arranged at the first H-shaped support (1), and the backward foot pedal (14) is arranged at the second H-shaped support (2).

5. The sand blasting pipe - sand return pipe cutting-off special fixture for a methanol dual-fuel container ship according to claim 4, characterized in that: The forward foot pedal (13) faces the front of the jig, and the backward foot pedal (14) faces the back of the jig.

6. A sand blasting pipe - sand return pipe cutting-off special fixture for a methanol dual-fuel container ship according to claim 5, characterized in that: The gap distance between the first upper layer plate (4) and the second upper layer plate (5) is 300-400 mm; the distance between the two open straight segments (16) in the U-shaped bracket structure is 2-5 mm larger than the diameter of the sandblasting pipe or the sand return pipe.

7. A sand blasting pipe - sand return pipe cutting-off special fixture for a methanol dual-fuel container ship according to claim 6, characterized in that: The first guard plate (7) and the second guard plate (8) are arranged in an inclined and symmetrical manner, and the support crossbeam end opening of the first guard plate (7) and the second guard plate (8) is larger than the reinforcing crossbeam end opening of the first guard plate (7) and the second guard plate (8).

8. A sand blasting pipe - sand return pipe cutting-off special fixture for a methanol dual-fuel container ship according to claim 7, characterized in that: The top edge of the first guard plate (7) is on a vertical line with the inner side of the first upper layer plate (4), and the bottom edge of the first guard plate (7) is on a vertical line with the inner side of the forward foot pedal (13); the top edge of the second guard plate (8) is on a vertical line with the inner side of the second upper layer plate (5), and the bottom edge of the second guard plate (8) is on a vertical line with the inner side of the backward foot pedal (14).

9. A sand blasting pipe - sand return pipe cutting-off special fixture for a methanol dual-fuel container ship according to claim 8, characterized in that: Pipe identification areas are arranged on the first upper layer plate (4) and the second upper layer plate (5).

10. The working method of the sandblasting pipe-sand return pipe cutting special fixed jig for a methanol dual-fuel container ship according to claim 9, characterized in that: cutting of the sand return pipe: a. The operator stands on the back of the fixture and, according to the pipeline markings on the first upper plate (4), inserts the return sand pipe into the opening of the first return sand pipe U-shaped frame (10) and places the corrugated groove of the return sand pipe into the arc-shaped bend (15). b. Straighten the return sand pipe, and then according to the pipe markings on the second upper plate (5), insert the return sand pipe into the opening of the second return sand pipe U-shaped bracket (12), and fix the corrugated groove of the return sand pipe in the arc-shaped bend section (15). At this time, the return sand pipe is set up horizontally. c. The operator steps on the foot pedal (14) to stabilize the fixture; the operator uses a cutting tool to cut the return sand pipe in the gap between the first upper plate (4) and the second upper plate (5) in the vertical direction. At this time, the support beam (6), the first guard plate (7) and the second guard plate (8) provide protection for the operator to avoid cuts. Cutting of sandblasting pipe: d. The operator stands in front of the fixture and, according to the pipeline markings on the first upper plate (4), inserts the sandblasting pipe into the opening of the first sandblasting pipe U-shaped frame (9) and places the corrugated groove of the sandblasting pipe into the arc-shaped bend (15). e. Straighten the sandblasting pipe, and then according to the pipe markings on the second upper plate (5), insert the sandblasting pipe into the opening of the second sandblasting pipe U-shaped frame (11), and fix the corrugated groove of the sandblasting pipe in the arc-shaped bend section (15). At this time, the sandblasting pipe is set up horizontally. f. The operator steps on the forward foot pedal (13) to stabilize the fixture; the operator uses a cutting tool to cut the sandblasting pipe located in the gap between the first upper plate (4) and the second upper plate (5) in the vertical direction. At this time, the support beam (6), the first guard plate (7) and the second guard plate (8) provide protection for the operator to avoid cuts.

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