A forming device and method for forming a hydrogen barrier material layer on the inner wall of a hydrogen bending pipe

Abstract

This invention discloses a forming device and method for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend, belonging to the field of bend inner wall coating forming. It includes a shell, with a guide head fixed at one end and a connector at the rear. A guide wheel is connected to the outside of the guide head. Spray nozzles are evenly distributed on the shell near the guide head. The rear wheel is linked to a drive plate, achieving adaptive adjustment of "the greater the bend, the more coating," ensuring uniform coating at the bend. The trigger component uses pure mechanical linkage, requiring no sensors, resulting in a simple and reliable structure. In the switching structure, the nozzle groove and the sealing slide have the same stroke, enabling continuous linear adjustment of the coating amount, avoiding leakage and unevenness. The cover plate provides unidirectional control to prevent backflow and ensure stable spray pressure. The guide wheel and rear wheel fixing seat are retractable to adapt to different pipe diameters, and the guide head weight-reducing holes improve throughput. An even number of nozzles with the same spray range avoids coating overlap or blind spots.

Description

Technical Field

[0001] This invention relates to the field of coating molding on the inner wall of bent pipes, and more specifically, to a molding apparatus and method for molding a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bent pipe. Background Technology

[0002] In the fields of petrochemicals, coal chemicals, and hydrogen energy storage and transportation, the media transported in pipelines often contain hydrogen or hydrides. Under high temperature and pressure conditions, hydrogen can easily permeate into the inner wall of metal pipelines, leading to failures such as hydrogen embrittlement and hydrogen-induced cracking, seriously threatening the safe operation and service life of the pipelines. To solve this problem, a hydrogen-barrier material layer is usually formed on the inner wall of the pipeline to prevent the permeation of hydrogen atoms.

[0003] As an indispensable connecting component in pipeline systems, the quality of the hydrogen barrier material layer formed on the inner wall of bends directly affects the reliability and safety of the entire pipeline system. Existing technologies for forming the hydrogen barrier layer on the inner wall of bends mainly face the following technical challenges:

[0004] 1. Uneven coating: Most existing spraying devices operate on a constant speed and constant coating volume. When the device passes through a bend, the curvature of the inner and outer sides of the bend is different, resulting in uneven speed of the device while the coating volume remains constant. This leads to an excessively thick coating on the inner side of the bend and an excessively thin coating on the outer side, or even missed coating.

[0005] 2. Difficulty adapting to curvature: Traditional spraying equipment is mostly a rigid structure, which makes it difficult to pass smoothly through curved pipe sections, and it cannot automatically adjust the spraying parameters according to the degree of curvature, resulting in difficulty in ensuring the coating quality at the bend.

[0006] 3. Low level of automation: Existing technologies mostly use manual spraying or external robotic arm spraying, which cannot enable the device to enter the inner wall of the curved pipe for intelligent spraying operations. The operation is complicated and inefficient.

[0007] 4. Difficulty in controlling coating thickness: Because it is impossible to sense the position and degree of bending of the device in the bend in real time, it is difficult to achieve precise control of the amount of coating, which ultimately affects the consistency and protective effect of the hydrogen barrier layer. Summary of the Invention

[0008] In view of the problems existing in the prior art, the purpose of the present invention is to provide a forming device and method for forming a hydrogen barrier material layer on the inner wall of a hydrogen-resistant bend.

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] A forming device for forming a hydrogen barrier material layer on the inner wall of a hydrogen-resistant bend includes a housing, a guide head fixed at one end of the housing and a connector connected to the tail of the housing, a guide wheel connected to the outside of the guide head, spray nozzles evenly distributed on one side of the housing near the guide head, a rear wheel fixed to the other side of the housing, a drive plate fixed in the middle of the rear wheel, and a triggering component for driving the spray nozzles to spray inside the housing.

[0011] The outer casing enters the curved tube, and the rear wheel rotates, driving the drive plate to rotate. The drive plate drives the spray nozzle to spray. The greater the rotation angle of the rear wheel on the curved tube, the more paint is sprayed from the spray nozzle.

[0012] Furthermore, the number of spray nozzles is even, and the spraying range between two adjacent spray nozzles is the same.

[0013] Furthermore, the triggering component includes a spray pipe disposed inside the housing and connected to the connector, the end of the spray pipe being connected to a connecting pipe, a sealing pipe inside the housing communicating with the spray nozzle, the liquid inlet of the sealing pipe being connected to the connecting pipe, a piston being slidably connected inside the sealing pipe, a piston rod being vertically fixed at the middle of one end of the piston and passing through one end of the sealing pipe, a trigger plate being vertically fixed at the end of the piston rod and contacting the drive plate, and a switch structure located between the spray nozzle and the sealing pipe inside the housing.

[0014] Furthermore, the triggering component also includes a cover plate rotatably connected to the liquid inlet of the sealing tube. When the piston moves toward the spray nozzle, the cover plate fits against the liquid inlet of the sealing tube. When the piston moves back, the cover plate rotates accordingly, opening the liquid inlet of the sealing tube.

[0015] Furthermore, the switch structure includes a sealing sliding groove formed between the spray nozzle and the sealing tube, a sealing sliding plate slidably connected in the sealing sliding groove, one end of the sealing sliding plate contacting the trigger plate, and a spray nozzle groove formed on one side of the sealing sliding plate, and a telescopic structure fixed to one end of the sealing sliding plate.

[0016] Furthermore, the telescopic structure includes a telescopic rod fixed to one end of the sealed sliding plate, and a return spring is sleeved on the outside of the telescopic rod.

[0017] Furthermore, the length of the nozzle groove is the same as the travel of the sealing slide plate.

[0018] Furthermore, a weight-reducing hole is provided on the inner side of the guide head.

[0019] Furthermore, the mounting bases where the guide wheel and the rear wheel are located are both telescopic.

[0020] A method for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend using the forming apparatus described above, comprising:

[0021] S1: Connect the connector to the outer inlet pipe and adjust the position of the guide wheel and rear wheel;

[0022] S2: The guide head enters the pipe, the guide wheel and the rear wheel rotate, the rear wheel drives the drive plate to rotate, and the drive plate drives the spray nozzle to spray.

[0023] S3: At the bend, the rear wheel controls the amount of paint sprayed by the drive plate based on the rotation angle and number of rotations, so as to make the paint spraying at the bend uniform.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] (1) The present invention achieves adaptive bending and uniform spraying by setting the following: through the linkage design of the rear wheel and the drive plate, the angle and number of rotations of the rear wheel at the bend directly determine the amount of spraying by the drive plate at the spray nozzle, realizing the adaptive adjustment of "the greater the bend, the more spraying", effectively compensating for the difference in coating thickness caused by the speed change of the device at the bend, and ensuring that the hydrogen barrier material layer on the inner wall of the bend is uniform along the entire circumference.

[0026] (2) The present invention has a compact structure and reliable linkage: the triggering component adopts a mechanical structure with piston, piston rod, trigger plate and drive plate in contact linkage. No additional sensors and electrical control components are required. The amount of spraying can be automatically adjusted by the movement of the device itself in the pipeline. The structure is simple and reliable and suitable for harsh working environments.

[0027] (3) The present invention has a fast response and high spraying accuracy through the setting of the switch: the sealing slide plate in the switch structure is linked to the trigger plate, and the length of the nozzle groove is the same as the stroke of the sealing slide plate, which ensures the alignment accuracy of the nozzle groove and the spraying port when the sealing slide plate moves, realizes the precise opening and closing of the spraying channel, and avoids leakage and uneven spraying.

[0028] (4) The present invention achieves one-way control of liquid inlet and prevents backflow by setting up a cover plate that automatically opens or closes the liquid inlet of the sealing tube according to the direction of piston movement. When the piston moves towards the spray nozzle, the cover plate fits and seals the liquid inlet to prevent liquid backflow. When the piston returns to its original position, the cover plate automatically opens to complete the liquid replenishment, thus realizing one-way control of liquid inlet and ensuring the stability of spraying pressure.

[0029] (5) Wide adaptability and strong passability: The mounting bases of the guide wheel and the rear wheel are telescopic and can be adjusted according to different pipe diameters, so that the device can adapt to various specifications of bent pipes; weight reduction holes are opened on the inner side of the guide head to reduce the weight of the front end of the device and improve passability.

[0030] (6) Consistent spraying range, avoid overlap or omission: The number of spray nozzles is set to an even number, and the spraying range between two adjacent spray nozzles is the same, to ensure that the spraying area of ​​each spray nozzle is seamlessly connected, and to avoid coating overlap or blind spots. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0032] Figure 2 This is a side view of the present invention;

[0033] Figure 3 For the present invention Figure 2 Sectional view at point AA along the middle;

[0034] Figure 4 This is a schematic diagram of the installation structure of the connecting pipe of the present invention;

[0035] Figure 5 This is a schematic diagram of the triggering component of the present invention;

[0036] Figure 6 This is a schematic diagram of the piston mounting structure of the present invention;

[0037] Figure 7 This is a schematic diagram of the switch structure of the present invention;

[0038] Figure 8 This is a schematic diagram of the spraying process between adjacent spray nozzles according to the present invention.

[0039] Explanation of the labels in the diagram:

[0040] 100. Housing; 200. Guide head; 300. Connector; 400. Guide wheel; 500. Spray nozzle; 600. Rear wheel; 700. Drive plate; 800. Trigger assembly; 801. Spray pipe; 802. Connecting pipe; 803. Sealing pipe; 804. Piston; 805. Piston rod; 806. Trigger plate; 807. Switch structure; 807a. Sealing sliding groove; 807b. Sealing sliding plate; 807c. Nozzle groove; 807d. Telescopic rod; 807e. Return spring; 808. Cover plate. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 8 A forming device for forming a hydrogen-blocking material layer on the inner wall of a hydrogen-resistant bend includes a shell 100. The shell 100 is a cylindrical structure made of stainless steel or corrosion-resistant alloy material, and its outer diameter is smaller than the inner diameter of the bend to be processed, so as to ensure that the device can move freely in the pipeline.

[0043] like Figure 1 As shown, a guide head 200 is fixed to the end of the outer shell 100. The guide head 200 is conical or hemispherical and is used to guide the device smoothly into the pipeline and reduce the resistance of movement. A weight-reducing hole is opened on the inner side of the guide head 200, which can reduce the weight of the front end of the device and improve the flexibility and passability of the device in the pipeline. A guide wheel 400 is connected to the outer side of the guide head 200. The guide wheel 400 is used to roll in contact with the inner wall of the pipeline and plays a guiding and supporting role.

[0044] The outer casing 100 is connected to a connector 300 at its tail end. The connector 300 is used to connect to an external hydrogen barrier material supply pipe to deliver the liquid hydrogen barrier coating into the device.

[0045] like Figure 1 , Figure 2 , Figure 3 As shown, spray nozzles 500 are evenly distributed on the side of the outer casing 100 near the guide head 200. The spray nozzles 500 are evenly arranged along the circumference of the outer casing 100 and are used to spray hydrogen-blocking material onto the inner wall of the bend. Figure 8 As shown, the number of spray nozzles 500 is even, and the spraying range between two adjacent spray nozzles 500 is the same. This design can ensure that the spraying area of ​​each spray nozzle can be seamlessly connected, so that the coating can be evenly covered in the circumferential direction, avoiding overlapping or spraying blind spots.

[0046] A rear wheel 600 is fixed to the other side of the outer casing 100. The rear wheel 600 rolls in contact with the inner wall of the pipe, providing support for the movement of the device and serving as a key component for detecting the degree of bending of the pipe. A drive plate 700 is fixed in the middle of the rear wheel 600, and the drive plate 700 rotates together with the rear wheel 600.

[0047] The housing 100 has a built-in trigger component 800 for driving the spray nozzle 500 to spray; the trigger component 800 is driven by the rotation of the rear wheel 600, and converts the rotational motion of the rear wheel 600 into a control signal for the spraying action.

[0048] By adopting the above technical solution, the outer casing 100 enters the bend under the action of external thrust or its own driving force; when the device moves in the straight pipe section, the rear wheel 600 rotates at a constant speed along the inner wall of the pipe, the drive plate 700 rotates at a constant speed accordingly, the trigger component 800 is uniformly triggered, and the spray nozzle 500 sprays hydrogen-blocking material outward with a stable spray amount; when the device enters the bend section, the rotation angle and number of rotations of the rear wheel 600 will change under the influence of the curvature of the bend—the greater the degree of curvature, the greater the rotation angle of the rear wheel 600. The more rotations the rear wheel 600 makes, the greater the angle and number of rotations the drive plate 700 makes. The drive plate 700 then drives the trigger component 800 to increase the amount of coating sprayed through the spray nozzle 500. That is, the greater the rotation angle of the rear wheel 600 on the bend, the more coating is sprayed through the spray nozzle 500. This adaptive adjustment mechanism of "the greater the bend, the more coating is sprayed" effectively compensates for the difference in coating thickness caused by the speed change of the device at the bend, and ensures that the hydrogen barrier material layer on the inner wall of the bend is uniform along the entire circumference.

[0049] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the trigger assembly 800 includes a spray pipe 801 disposed inside the housing 100 and connected to the connector 300; a connecting pipe 802 is connected to the end of the spray pipe 801, the connecting pipe 802 being used to deliver paint to the sealing pipe 803; the housing 100 contains a sealing pipe 803 connected to the spray nozzle 500, and the inlet of the sealing pipe 803 is connected to the connecting pipe 802; as shown Figure 5 and Figure 6 As shown, a piston 804 is slidably connected inside the sealing tube 803, and the piston 804 can reciprocate axially within the sealing tube 803. A piston rod 805 is vertically fixed at the middle of one end of the piston 804, passing through one end of the sealing tube 803. A trigger plate 806, which contacts the drive plate 700, is vertically fixed at the end of the piston rod 805. The end face of the trigger plate 806 is in contact with the outer edge of the drive plate 700. When the drive plate 700 rotates with the rear wheel 600, the protruding part or eccentric contour of the drive plate 700 will push the trigger plate 806 to move. The housing 100 has a built-in switch structure 807 located between the spray nozzle 500 and the sealing tube 803. The switch structure 807 is used to control the opening and closing of the channel between the spray nozzle 500 and the sealing tube 803.

[0050] By adopting the above technical solution, when the drive plate 700 rotates behind the rear wheel 600 and pushes the trigger plate 806, the trigger plate 806 pushes the piston 804 to move inside the sealing tube 803 through the piston rod 805, pressing the paint inside the sealing tube 803 against the switch structure 807, and finally spraying it out from the spray nozzle 500; the greater the rotation angle of the drive plate 700, the greater the distance the trigger plate 806 is pushed, the greater the stroke of the piston 804, and the greater the amount of paint sprayed, thereby achieving adaptive adjustment of the spray amount proportional to the degree of bending of the tube.

[0051] like Figure 5 and Figure 6 As shown, the trigger assembly 800 also includes a cover plate 808 rotatably connected to the inlet of the sealing tube 803; the cover plate 808 can rotate freely within a certain angle around its hinge axis, and has the function of a one-way valve. When the piston 804 moves toward the spray nozzle 500 (i.e., when spraying paint), the internal pressure of the sealing tube 803 increases, and the cover plate 808, under the action of liquid pressure and its own structure, adheres to the inlet of the sealing tube 803, sealing the inlet and preventing paint from flowing back into the connecting tube 802; when the piston 804 moves back (i.e., returning to its position to prepare for the next spraying), the internal pressure of the sealing tube 803 decreases, and the cover plate 808 rotates under the action of external atmospheric pressure or the pressure of the inlet pipe, opening the inlet of the sealing tube 803, allowing the paint in the connecting tube 802 to replenish into the sealing tube 803, completing the replenishment and preparing for the next spraying.

[0052] By adopting the above technical solution, the cover plate 808 automatically opens or closes in the direction of movement of the piston 804, realizing unidirectional control of liquid inlet, avoiding paint backflow during spraying, and ensuring the stability of spraying pressure and the accuracy of spraying amount for each spraying.

[0053] like Figure 3 , Figure 5 and Figure 7 As shown, the switch structure 807 includes a sealing sliding groove 807a formed between the spray nozzle 500 and the sealing tube 803. The sealing sliding groove 807a is a slot formed radially or axially along the outer casing 100, and a sealing slide plate 807b is slidably connected inside it. One end of the sealing slide plate 807b contacts the trigger plate 806 and can slide with the movement of the trigger plate 806. A nozzle groove 807c is formed on one side of the sealing slide plate 807b. The nozzle groove 807c is a through hole or groove penetrating the sealing slide plate 807b, and its length is the same as the stroke of the sealing slide plate 807b. A telescopic structure is fixed to one end of the sealing slide plate 807b. The telescopic structure includes a telescopic rod 807d fixed to one end of the sealing slide plate 807b, and a return spring 807e is sleeved on the outside of the telescopic rod 807d. The return spring 807e always applies a spring force to push the sealing slide plate 807b back to its initial position.

[0054] By adopting the above technical solution, when the trigger plate 806 is not pushed by the drive plate 700, the sealing slide plate 807b is in its initial position under the action of the return spring 807e. At this time, the nozzle groove 807c is not aligned with the outlet of the sealing tube 803 and the spray nozzle 500. The solid part of the sealing slide plate 807b closes the channel between the sealing tube 803 and the spray nozzle 500, and the spray nozzle 500 is closed. When the drive plate 700 rotates the rear wheel 600 and pushes the trigger plate 806 to move, the trigger plate 806 pushes the sealing slide plate 807b to slide in the sealing sliding groove 807a, overcoming the elastic force of the return spring 807e. During the movement of the sealing slide plate 807b, the nozzle groove 807c gradually aligns with the outlet of the sealing tube 803 and the spray nozzle 500. When the sealing slide plate 807b moves to the end of its stroke, the nozzle groove 807c is fully connected to the sealing tube 803 and the spray nozzle 500. Under the push of the piston 804, the paint is sprayed from the sealing tube 803 through the nozzle groove 807c and out of the spray nozzle 500. The greater the rotation angle of the drive plate 700, the greater the distance the trigger plate 806 is pushed, the greater the sliding stroke of the sealing slide plate 807b, the higher the alignment between the nozzle groove 807c and the outlet of the sealing tube 803, the larger the cross-sectional area of ​​the spraying channel, and the corresponding increase in the amount of paint sprayed. When the drive plate 700 continues to rotate and disengages from the trigger plate 806, the sealing slide plate 807b returns to its original position under the action of the return spring 807e, the nozzle groove 807c and the outlet of the sealing tube 803 are misaligned, the channel is closed, and the spraying stops. For each rotation of the drive plate 700, the trigger assembly 800 completes one complete spraying cycle.

[0055] It is worth noting that the design of the nozzle groove 807c having the same length as the sealing slide plate 807b ensures that as the sealing slide plate 807b moves from the initial position to the end position, the nozzle groove 807c gradually changes from being completely misaligned to being completely aligned, realizing continuous linear adjustment of the spray amount, rather than simple on / off control. This is one of the key technical features of the present invention for achieving adaptive uniform spraying on curved pipes.

[0056] like Figure 1 As shown, the fixed bases where the guide wheel 400 and the rear wheel 600 are located are telescopic; specifically, the guide wheel 400 and the rear wheel 600 are both mounted on telescopic brackets or fixed bases. By adjusting the telescopic length, the distance by which the guide wheel 400 and the rear wheel 600 extend radially out of the outer shell 100 can be changed, thereby adapting to bent pipes of different inner diameter specifications and expanding the applicability of the device.

[0057] By adopting the above technical solution, when the diameter of the bend to be processed changes, only the extension length of the guide wheel 400 and the rear wheel 600 needs to be adjusted, so that the device can maintain good contact with the inner wall of pipes of different specifications, without having to replace the entire device, thus improving the versatility and economy of the equipment.

[0058] The present invention also provides a method for forming a hydrogen barrier material layer on the inner wall of a hydrogen-resistant bend using the forming apparatus described above, comprising the following steps:

[0059] S1: Connect the connector 300 to the external hydrogen barrier coating inlet pipe. According to the inner diameter of the bend to be treated, manually or automatically adjust the extension length of the guide wheel 400 and the rear wheel 600 so that the guide wheel 400 and the rear wheel 600 can maintain good contact with the inner wall of the pipe.

[0060] S2: Align the guide head 200 with the pipe inlet and push the device into the pipe using external thrust or the device's own drive mechanism; during the device's movement, the guide wheel 400 and the rear wheel 600 roll along the inner wall of the pipe; the rolling of the rear wheel 600 drives the drive plate 700 to rotate, and the rotation of the drive plate 700 pushes the trigger plate 806, which in turn drives the piston 804 and the switch structure 807, so that the spray nozzle 500 sprays intermittently or continuously according to the rotation speed of the rear wheel 600, and the hydrogen-blocking material is evenly coated on the inner wall of the pipe;

[0061] S3: When the device travels to the bend section, the rear wheel 600 rolls along the inner wall of the bend, and its rotation angle and number of rotations are significantly increased compared to the straight section. The rear wheel 600 controls the rotation of the drive plate 700 based on the rotation angle and number of rotations, thereby controlling the amount of coating sprayed by the spray nozzle 500. The larger the rotation angle and the more rotations of the rear wheel 600, the greater the amount of coating sprayed. This automatic adjustment mechanism ensures that the amount of hydrogen barrier material sprayed at the bend is consistent with that at the straight section, thereby achieving uniform coating formation at the bend.

[0062] Through the above steps, the hydrogen barrier material layer can achieve a uniform thickness in both straight and curved pipe sections, effectively solving the technical problem of excessively thin or missing coating at curved pipe sections.

[0063] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A forming device for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend, comprising a housing (100), characterized in that: The outer casing (100) is fixed with a guide head (200) at one end and a connector (300) is connected to the tail of the outer casing (100). A guide wheel (400) is connected to the outside of the guide head (200). Spray nozzles (500) are evenly distributed on one side of the outer casing (100) near the guide head (200). A rear wheel (600) is fixed to the outside of the other side of the outer casing (100). A drive plate (700) is fixed in the middle of the rear wheel (600). A trigger assembly (800) for driving the spray nozzles (500) to spray is built into the outer casing (100). The outer casing (100) enters the bend, and the rear wheel (600) rotates, driving the drive plate (700) to rotate. The drive plate (700) drives the spray nozzle (500) to spray. The greater the rotation angle of the rear wheel (600) on the bend, the more the spray nozzle (500) sprays.

2. The forming device for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend according to claim 1, characterized in that: The number of spray nozzles (500) is even, and the spraying range is the same between two adjacent spray nozzles (500).

3. The forming device for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend according to claim 1, characterized in that: The trigger assembly (800) includes a spray pipe (801) disposed inside the housing (100) and connected to the connector (300). The end of the spray pipe (801) is connected to a connecting pipe (802). The housing (100) contains a sealing pipe (803) connected to the spray nozzle (500). The inlet of the sealing pipe (803) is connected to the connecting pipe (802). A piston (804) is slidably connected inside the sealing pipe (803). A piston rod (805) is vertically fixed at the middle of one end of the piston (804) and passes through one end of the sealing pipe (803). A trigger plate (806) is vertically fixed at the end of the piston rod (805) and contacts the drive plate (700). The housing (100) contains a switch structure (807) located between the spray nozzle (500) and the sealing pipe (803).

4. The forming device for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend according to claim 3, characterized in that: The triggering component (800) also includes a cover plate (808) rotatably connected to the liquid inlet of the sealing tube (803). When the piston (804) moves toward the spray nozzle (500), the cover plate (808) fits against the liquid inlet of the sealing tube (803). When the piston (804) moves back, the cover plate (808) rotates accordingly, opening the liquid inlet of the sealing tube (803).

5. The forming device for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend according to claim 3, characterized in that: The switch structure (807) includes a sealing sliding groove (807a) formed between the spray nozzle (500) and the sealing tube (803). A sealing slide plate (807b) is slidably connected in the sealing sliding groove (807a). One end of the sealing slide plate (807b) is in contact with the trigger plate (806), and a nozzle groove (807c) is formed on one side of the sealing slide plate (807b). A telescopic structure is fixed at one end of the sealing slide plate (807b).

6. The forming device for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend according to claim 5, characterized in that: The telescopic structure includes a telescopic rod (807d) fixed to one end of the sealing slide plate (807b), and a return spring (807e) is sleeved on the outside of the telescopic rod (807d).

7. The forming device for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend according to claim 5, characterized in that: The length of the nozzle groove (807c) is the same as the stroke of the sealing slide plate (807b).

8. The forming device for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend according to claim 1, characterized in that: The guide head (200) has a weight reduction hole on its inner side.

9. The forming device for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend according to claim 1, characterized in that: The mounting bases where the guide wheel (400) and the rear wheel (600) are located are both telescopic.

10. A method for forming a hydrogen-barrier material layer on the inner wall of a hydrogen-resistant bend using the forming apparatus as described in any one of claims 1-9, comprising: S1: Connect the connector (300) to the outer inlet pipe and adjust the position of the guide wheel (400) and the rear wheel (600); S2: The guide head (200) enters the pipe, the guide wheel (400) and the rear wheel (600) rotate, the rear wheel (600) drives the drive plate (700) to rotate, and the drive plate (700) drives the spray nozzle (500) to spray; S3: At the bend, the rear wheel (600) controls the drive plate (700) to drive the spray nozzle (500) to spray the amount of paint according to the rotation angle and number of rotations, so as to make the spraying at the bend uniform.

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