Infrared welding equipment, method and system for liner of hydrogen storage tank

Abstract

The invention belongs to the field of infrared welding, and provides infrared welding equipment, method and system for an inner container of a hydrogen storage tank, and the method comprises the steps that S1, a positioning tool is controlled to move a tank body to a designated position for clamping and positioning; s2, the positioning tool is controlled to move, and the infrared heater is controlled to move to reach a preset heating position; s3, the infrared heater is controlled to heat the welding face of the tank body to reach the welding temperature; and S4, the infrared heater is controlled to reset, the positioning tool continues to move, and the welding faces are made to make contact. According to the equipment, the method and the system, multiple sections of tank liners can be welded at the same time, and the welding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of infrared welding, and in particular to an infrared welding device method and system for the inner liner of a hydrogen storage tank. Background Art

[0002] The plastic liner fiber-wound bottle is also called a Type IV hydrogen storage bottle, which has the advantages of lightweight, low cost, and high safety. The Type IV hydrogen storage bottle is a multi-layer structure. The innermost layer is a thermoplastic plastic liner, such as nylon material, to prevent hydrogen leakage; the middle layer and the outer layer are made of carbon fiber or glass fiber composite material structure. In the prior art, for the production of nylon liners, blow molding and injection molding are currently the two mainstream molding processes, depending on the material selection. Among them, the injection molding process is widely used due to its fast molding speed, high precision, and high yield rate. However, the injection molding process requires the welding of two half barrels to form an integral hydrogen storage bottle liner.

[0003] The welding of thermoplastics adopts hot melt welding technology, that is, a heating plate is used to contact the welding surface to heat the welding surface. In the prior art, the nylon liner is heated by contact with the heating plate. When the contact surface of the nylon liner reaches the heating temperature, the nylon material melts, causing the contact surface to easily adhere to the heating plate. However, the current laser welding technology used for nylon liner can only weld two sections of the tank body, with low welding efficiency, a single length of the tank body after welding, low welding accuracy, and low welding yield rate. Summary of the invention

[0004] In order to solve the problem in the prior art that the nylon liner is easily adhered to the heating plate when welded by the heating plate, and the welding efficiency is low and only two tank bodies can be welded at one time, the present invention provides an infrared welding device, method and system for the liner of a hydrogen storage tank, and the specific scheme is as follows:

[0005] A hydrogen storage tank infrared welding device comprises a frame and a control cabinet, wherein the control cabinet is arranged on one side of the frame; the frame further comprises a left positioning tool, a right positioning tool, a middle positioning tool, an infrared heater, a left tank body, a middle tank body, and a right tank body, wherein the left positioning tool and the right positioning tool are arranged on a frame base for clamping the left tank body and the right tank body; the middle positioning tool is fixedly connected to the frame for clamping the middle tank body; the left positioning tool, the right positioning tool, and the middle positioning tool are on a center line; and the infrared heater is arranged on the frame base behind the middle positioning tool.

[0006] A method for infrared welding the inner liner of a hydrogen storage tank based on the above hydrogen storage tank infrared welding equipment, the method comprising:

[0007] S1: Control the left positioning tool and the right positioning tool to move the left tank body and the right tank body to the designated position for clamping and positioning; control the middle positioning tool to move the middle tank body to be on the same center line with the left tank body and the right tank body for clamping and positioning;

[0008] S2: Control the left positioning tool and the right positioning tool to move toward the middle positioning tool, and control the infrared heater to move to a preset heating position;

[0009] S3: Controlling the infrared heater to heat the welding surfaces of the left tank body, the middle tank body, and the right tank body to reach the welding temperature;

[0010] S4: Control the infrared heater to reset, and the left positioning tool and the right positioning tool continue to move toward the middle positioning tool to make the welding surfaces contact.

[0011] Furthermore, the infrared welding method for the inner liner of the hydrogen storage tank also includes:

[0012] S5: After the welding surface is cooled, the left positioning tool and the right positioning tool are controlled to reset, the middle positioning tool is opened, and the welded hydrogen tank liner is taken out.

[0013] Further, the S1 includes:

[0014] S11: Control the left positioning tool to move the left tank body for clamping and positioning;

[0015] S12: Control the right positioning tool to move the right tank body for clamping and positioning;

[0016] S13: Control the intermediate positioning tool to move the intermediate tank body for clamping and positioning;

[0017] S14: Control the left tank body, the right tank body and the middle tank body to be on the same center line after clamping and positioning.

[0018] Further, the S2 includes:

[0019] S21: Control the left positioning tool to drive the left tank to move rightward;

[0020] S22: Control the right positioning tool to drive the right tank body to move leftward;

[0021] S23: Control the infrared heater to move forward;

[0022] S24: Control the infrared heater to heat a region corresponding to the welding surface and stop moving when the infrared heater reaches a preset distance threshold from the welding surface of the intermediate tank body;

[0023] S25: Control the left tank body welding surface and the right tank body welding surface to stop moving when the distance from the infrared heater reaches a preset distance threshold.

[0024] Further, the S3 includes:

[0025] S31: controlling the infrared heater to heat the welding surface;

[0026] S32: After the welding surface reaches the preset heating temperature, the infrared heater is controlled to stop heating.

[0027] Further, the S4 includes:

[0028] S41: Controlling the infrared heater to quickly move backward and reset;

[0029] S42: Control the left positioning tool to continue to drive the left tank to move to the right;

[0030] S43: Control the right positioning tool to continue to drive the right tank body to move leftward;

[0031] S44: After the welding surfaces are in contact, the left positioning tool and the right positioning tool stop moving and provide a stable pushing force to the welding surfaces.

[0032] Further, the S5 includes:

[0033] S51: After the weld is cooled, the left positioning tool, the right positioning tool, and the middle positioning tool are controlled to release and open the welded tank body;

[0034] S52: Control the left positioning tool to move leftward to reset;

[0035] S53: Control the right positioning tool to move rightward to reset;

[0036] S54: Take out the welded tank body.

[0037] Furthermore, the preset distance threshold is 3mm-5mm.

[0038] An infrared welding system is applied to the above-mentioned hydrogen storage tank liner infrared welding equipment or adopts the above-mentioned hydrogen storage tank liner infrared welding method to produce the hydrogen storage tank liner.

[0039] The beneficial effects of the present invention are as follows: through the above-mentioned equipment, method and system, multiple sections of tank bodies can be welded, and the welding efficiency is high and the yield rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0041] Figure 1 Hydrogen storage tank infrared welding method steps diagram

[0042] Figure 2 Schematic diagram of infrared welding equipment for hydrogen storage tank liner DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the embodiment of the present invention clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of this (invention or invention), it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this (invention or invention). Moreover, the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the presence of other identical elements in the process, method, article or device including the elements. If there is no conflict, the present invention or the embodiments of the invention and the various features in the embodiments can be combined with each other, all within the scope of protection of the present invention.

[0044] In the first aspect, a hydrogen storage tank infrared welding device is provided:

[0045] A hydrogen storage tank infrared welding device comprises a frame 1 and a control cabinet 2, wherein the control cabinet 2 is arranged on one side of the frame 1; the frame 1 also comprises a left positioning tool 3-1, a right positioning tool 3-2, a middle positioning tool 4, an infrared heater 5, a left tank body 6-1, a middle tank body 6-2, and a right tank body 6-3, wherein the left positioning tool 3-1 and the right positioning tool 3-2 are arranged on the base of the frame 1 for clamping the left tank body 6-1 and the right tank body 6-3; the middle positioning tool 4 is fixedly connected to the frame 1 for clamping the middle tank body 6-2; the left positioning tool 3-1, the right positioning tool 3-2, and the middle positioning tool 4 are on a center line; the infrared heater 5 is arranged on the base of the frame 1 behind the middle positioning tool 4.

[0046] In this embodiment, the frame size is L 6005X B 2193X H2420mm, with a compact appearance and small footprint. 300#X150 thickened flat tube is used as the main frame welding, and the structural strength is high. The control cabinet is used to store the welding system and send welding instructions; the frame is also provided with a safety grating to prevent people from approaching the welding equipment and avoid casualties. It can be used to replace traditional mechanical barriers or other forms of mechanical protection, and can increase the maintainability of the equipment. In conjunction with the safety grating, the operability and efficiency of the welding equipment can also be increased.

[0047] The above equipment can process product sizes: 351mm in diameter and 800--3200mm in length. When the length of the barrel changes, the barrel clamping device and infrared welding assembly need to be adjusted, or the parts need to be redesigned. If the outer diameter of the inner liner of the hydrogen tank to be processed is larger than 351mm, the machine needs to be remade. If the outer diameter of the hydrogen tank to be processed is smaller than 351mm, the machine needs to change the size of the tank clamping device and the position of the infrared welding assembly.

[0048] Specifically, the left positioning tooling, the right positioning tooling and the base of the frame 1 are provided with mutually cooperating slide groove components, and the left positioning tooling and the right positioning tooling can move left and right within the sliding range of the slide groove.

[0049] Specifically, the middle positioning tooling includes two parts: a tank body bracket and a moving device; the tank body bracket is two semicircular shaped molds, which are divided into an upper semicircle and a lower semicircle for positioning and clamping the middle tank body, the upper semicircle mold is movably connected to the moving device, the moving device is fixedly connected to the top of the frame, and the lower semicircle mold of the tank body bracket is fixedly connected to the base of the frame; after the middle tank body is placed, the moving device drives the upper semicircle mold of the tank body bracket to move and merge with the lower semicircle mold of the tank body bracket to position and fix the middle tank body. Control the left and right positioning tooling clamped by the left positioning tooling and the right positioning tooling to be in line with the center of the middle tank body. The tank body bracket is also equipped with four sensors to sense whether the middle tank body is installed in place. When the positioning bracket is closed, it is positioned with a positioning pin so that the two semicircular molds can be accurately combined into one.

[0050] Specifically, thrust cylinders are also provided in the left positioning tool and the right positioning tool to apply a stable pressure to the welding point when the welding surfaces are in contact, thereby increasing the welding accuracy.

[0051] More specifically, a rotating assembly is provided on the middle positioning tooling and the left and right positioning tooling, which can rotate the tank body during heating so that the welding surface is heated more evenly; further, the left and right positioning tooling also includes a tank body clamping assembly, and the tank body clamping assembly includes a clamping cylinder, a pull rod, and a clamping rubber sleeve. The clamping cylinder drives the pull rod to move by controlling the air pressure to control the pressure plate to clamp the clamping rubber sleeve to clamp the tank body. The left and right positioning tooling also includes a tank body centering ring to further fix the tail of the tank body.

[0052] Specifically, at least two infrared heaters are provided, and the infrared heaters are provided on the frame base and can be fine-tuned in the left and right directions; a cylinder is provided above the infrared heater to push out or reset the heating plate; optical glass is provided outside the heating circle of the heating plate to further reduce the impact of the environment on the heating efficiency.

[0053] In the second aspect, an infrared welding method based on the above-mentioned device is provided:

[0054] A method for infrared welding the inner liner of a hydrogen storage tank based on the above hydrogen storage tank infrared welding equipment, the method comprising:

[0055] S1: Control the left positioning tool 3-1 and the right positioning tool 3-2 to move the left tank body 6-1 and the right tank body 6-3 to the designated positions for clamping and positioning; control the middle positioning tool 4 to move the middle tank body 6-2 to be on the same center line with the left tank body 6-1 and the right tank body 6-3 for clamping and positioning;

[0056] S2: Control the left positioning tool 3-1 and the right positioning tool 3-2 to move toward the middle positioning tool 4, and control the infrared heater 5 to move to a preset heating position;

[0057] S3: Control the infrared heater 5 to heat the welding surfaces of the left tank body 6-1, the middle tank body 6-2, and the right tank body 6-3 to reach the welding temperature;

[0058] S4: Control the infrared heater 5 to reset, and the left positioning tool 3-1 and the right positioning tool 3-2 continue to move toward the middle positioning tool 4 to make the welding surfaces contact.

[0059] In this embodiment, the hydrogen storage tank to be welded includes three sections. The left and right tank bodies are moved to the welding position by the movement of the left and right positioning tooling. The infrared heater is moved to the welding position to heat the welding surface of the multi-section tank body. The infrared heater is then reset. The left and right positioning tooling provides a stable pressure on the left and right tank bodies to ensure that the welding joints are always tightly combined without gaps. The force can be achieved by adjusting the left and right positioning tooling.

[0060] Furthermore, the infrared welding method for the inner liner of the hydrogen storage tank also includes:

[0061] S5: After the welding surface is cooled, the left positioning tool 3-1 and the right positioning tool 3-2 are controlled to reset, the middle positioning tool 4 is opened, and the welded hydrogen tank liner is taken out.

[0062] In this embodiment, when the welding surface cools down and welding is completed, the left and right positioning tools release the can body and reset, and the middle positioning tool also releases the can body, and the welded product can be taken out, and the above steps are repeated to carry out the next welding process.

[0063] Further, the S1 includes:

[0064] S11: Control the left positioning tool 3-1 to move the left tank body 6-1 for clamping and positioning;

[0065] S12: Control the right positioning tool 3-2 to move the right tank body 6-3 for clamping and positioning;

[0066] S13: Control the intermediate positioning tool 4 to move the intermediate tank body 6-2 for clamping and positioning;

[0067] S14: Control the left tank body 6-1, the right tank body 6-3 and the middle tank body 6-2 to be on the same center line after being clamped and positioned.

[0068] In this embodiment, the left and right positioning tooling is provided with sensors. After the tank is placed, the sensors will sense whether the tank is extended too long or whether there is a tank. If an abnormality is sensed, the sensors will alarm. This sensor can ensure that the left and right positioning tooling can accurately position and clamp the left and right tanks. The left and right positioning tooling clamps the left and right tanks by clamping the clamping cylinder and the clamping rubber sleeve to achieve the clamping and fixing of the tanks.

[0069] The intermediate positioning tooling positions and clamps the intermediate tank body by setting two semicircular shaped mold devices. After the intermediate tank body is placed, the two semicircular molds are merged to ensure that the center line of the intermediate tank body coincides with the center line of the two semicircular molds when they are merged. In this way, the positioning methods of the left and right positioning tooling and the intermediate positioning tooling are controlled to ensure that the centers of the three-section tank body welding surfaces are on the same center line.

[0070] Further, the S2 includes:

[0071] S21: Control the left positioning tool 3-1 to drive the left tank body 6-1 to move rightward;

[0072] S22: Control the right positioning tool 3-2 to drive the right tank body 6-3 to move leftward;

[0073] S23: Control the infrared heater 5 to move forward;

[0074] S24: Control the infrared heater 5 so that the heating area corresponds to the welding surface and the infrared heater 5 stops moving when the distance from the welding surface of the intermediate tank body 6-2 reaches a preset distance threshold;

[0075] S25: Control the left tank body 6 - 1 welding surface and the right tank body 6 - 3 welding surface to stop moving when the distance from the infrared heater 5 reaches a preset distance threshold.

[0076] In this embodiment, after the tank body is positioned, the equipment receives an instruction to move to the preset welding position and starts to move the left and right positioning tooling simultaneously toward the middle tank body. At this time, the left positioning tooling moves to the right and the right positioning tooling moves to the left. The moving speeds at both ends should be consistent, and one end can also be fine-tuned.

[0077] At this time, at least two infrared heaters move forward synchronously until the two sides of the heating plate of the infrared heater correspond to the welding surface to be heated, and then stop moving forward. A cylinder is set on the infrared heater, and the heating plate is connected to the cylinder. The heating plate can move forward and backward with the cylinder. The infrared heater is also provided with a sensor for detecting whether there is an obstacle on the moving route of the heating plate.

[0078] The left positioning tool and the right positioning tool are controlled to move to the left tank body and the right tank body welding surface to stop moving when the distance from the infrared heater heating plate reaches a preset threshold, and wait for the infrared heater to execute the heating instruction to heat the welding surface.

[0079] Further, the S3 includes:

[0080] S31: Control the infrared heater 5 to heat the welding surface;

[0081] S32: After the welding surface reaches the preset heating temperature, the infrared heater 5 is controlled to stop heating.

[0082] In this embodiment, the infrared heater receives the heating instruction and starts to heat the welding surface. The preset heating temperature can be set by setting a temperature detection sensor, and when the set temperature is reached, a command to stop heating is issued to the infrared heater. Preferably, the preset heating temperature can be determined by setting the heating power and heating time of the heating plate. Under the premise of setting a certain heating power, by setting a countdown for the heating time, the infrared heater automatically executes the stop heating instruction after the countdown ends.

[0083] Preferably, three heating circuits are arranged on the heating plate of the infrared heater, and the three heating circuits are individually connected to different power supplies and can control the heating power individually, thereby further ensuring the stability of the heat output of the entire heating plate.

[0084] Further, the S4 includes:

[0085] S41: Control the infrared heater 5 to quickly move backward and reset;

[0086] S42: Control the left positioning tool 3-1 to continue to drive the left tank body 6-1 to move rightward;

[0087] S43: Control the right positioning tool 3-2 to continue to drive the right tank body 6-3 to move leftward;

[0088] S44: After the welding surfaces are in contact, the left positioning tool 3-1 and the right positioning tool 3-2 stop moving and provide a stable pushing force to the welding surfaces.

[0089] In this embodiment, after the welding surface is heated to the preset temperature, in order to prevent the welding surface from cooling too quickly, the infrared heater should be quickly controlled to move and reset to provide space for the welding surface contact; at this time, the left positioning tool continues to move to the right, and the right positioning tool continues to move to the left until the welding surfaces are in contact and the welding is fused.

[0090] Preferably, a thrust cylinder is arranged in the left and right positioning tooling, and the thrust of the thrust cylinder acts on the left and right tank bodies. When the left and right positioning tooling moves to the position where the welding surface contacts, the left and right positioning tooling stops moving. At this time, in order to ensure that the welding joint has a higher degree of fusion and no gaps, a stable thrust force can be applied to the left and right tank bodies by the cylinder, thereby improving the degree of fusion at the welding joint and further improving the welding yield rate.

[0091] Further, the S5 includes:

[0092] S51: After the welding position is cooled, the left positioning tool 3-1, the right positioning tool 3-2, and the middle positioning tool 4 are controlled to release and open the welded tank body;

[0093] S52: Control the left positioning tool 3-1 to move leftward to reset;

[0094] S53: Control the right positioning tool 3-2 to move rightward to reset;

[0095] S54: Take out the welded tank body.

[0096] In this embodiment, after waiting for the weld to cool, the device receives a release command, at which time the thrust cylinders of the left and right positioning tooling are reset, the clamping rubber sleeve is loosened, and the tank body is released; the two semicircles of the middle positioning tooling are opened, and the upper semicircle mold is moved to the upper end of the frame by means of a moving device. At this time, the left positioning tooling is controlled to move to the left and reset, and the right positioning tooling is controlled to move to the right and reset, and the welded tank body is completely exposed and can be taken out.

[0097] Furthermore, the preset distance threshold is 3mm-5mm.

[0098] In this embodiment, the preset distance threshold is 3mm-5mm. Within this distance range, the heating effect of the infrared heater can be guaranteed to the maximum extent, and the contact surface does not contact the heater surface, preventing the nylon liner from sticking to the infrared heater after heating and melting. And the preset distance threshold is within the distance range of 3mm-5mm, which can minimize the environmental impact and prevent environmental factors from affecting the heating of the infrared heater, that is, ensuring the consistency of the melting temperature of the welding surface and improving the welding accuracy. In addition, the moving speed of the left and right positioning tooling should not exceed 250mm / s. If it moves too fast, it will make it difficult to accurately control the preset distance threshold. At the same time, the moving speed of the left and right positioning tooling cannot be too slow, which will reduce the welding efficiency; this speed generally refers to the speed at which the left and right positioning tooling moves at the same time, that is, the two ends should move at the same speed, but it does not rule out that in special cases, the moving speed of the unilateral positioning tooling needs to be fine-tuned so that it reaches the preset heating position at the same time.

[0099] Preferably, the left positioning tool or the right positioning tool can be moved independently or set at different moving speeds, and the moving speed of the left and right positioning tool is less than 250mm / s. When it is necessary to weld more than three sections of tank bodies or the tank body size exceeds the tank body size fixedly processed by the equipment, the left positioning tool or the right positioning tool can be used to move independently or at different moving speeds. For example, it is necessary to weld an inner liner with two intermediate tank bodies and one left tank body and one right tank body. At this time, step one: first use the left positioning tool (or the right positioning tool, the left positioning tool is taken as an example below) to clamp Hold the left tank body and move it unilaterally to the welding position to weld it with the first section of the intermediate tank body clamped by the middle positioning tool. After the welding point is cooled, take out the semi-finished product; Step 2: Use the left positioning tool to clamp and position the semi-finished product, the middle positioning tool to position the second section of the intermediate tank body, and the right positioning tool to clamp and position the right tank body. By setting the moving speeds of the left positioning tool and the right positioning tool to be different, control the welding surface of the semi-finished product and the welding surface of the right tank body to reach the preset heating position at the same time; Step 3: Heat the welding point, weld, and take out the extended liner finished product after cooling.

[0100] This solution can be used as an emergency method when the number of welds for the extended liner is small or in other emergencies, without the need to re-customize the welding equipment.

[0101] In a third aspect, an infrared welding system is provided, which is applied to the above-mentioned device or adopts the above-mentioned welding method:

[0102] An infrared welding system is applied to the above-mentioned hydrogen storage tank liner infrared welding equipment or adopts the above-mentioned hydrogen storage tank liner infrared welding method to produce the hydrogen storage tank liner.

[0103] In this embodiment, an infrared welding system is provided, in which the above-mentioned welding method is written into the system, and is executed by the control cabinet in the above-mentioned equipment to send instructions for all movements and heating during the welding process.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen storage tank infrared welding equipment, characterized in that: The invention comprises a frame (1) and a control cabinet (2), wherein the control cabinet (2) is arranged on one side of the frame (1); the frame (1) further comprises a left positioning tool (3-1), a right positioning tool (3-2), a middle positioning tool (4), an infrared heater (5), a left tank body (6-1), a middle tank body (6-2), and a right tank body (6-3); the left positioning tool (3-1) and the right positioning tool (3-2) are arranged on a base of the frame (1) for clamping the left tank body (6-1) and the right tank body (6-3); the middle positioning tool (4) is fixedly connected to the frame (1) for clamping the middle tank body (6-2); the left positioning tool (3-1), the right positioning tool (3-2), and the middle positioning tool (4) are on a central line; and the infrared heater (5) is arranged on the base of the frame (1) behind the middle positioning tool (4).

2. A method for infrared welding the inner liner of a hydrogen storage tank based on the infrared welding equipment for hydrogen storage tanks according to claim 1, characterized in that: The method comprises: S1: Control the left positioning tool (3-1) and the right positioning tool (3-2) to move the left tank body (6-1) and the right tank body (6-3) to designated positions for clamping and positioning; control the middle positioning tool (4) to move the middle tank body (6-2) to be on the same center line as the left tank body (6-1) and the right tank body (6-3) for clamping and positioning; S2: Controlling the left positioning tool (3-1) and the right positioning tool (3-2) to move toward the middle positioning tool (4), and controlling the infrared heater (5) to move to a preset heating position; S3: controlling the infrared heater (5) to heat the welding surfaces of the left tank body (6-1), the middle tank body (6-2), and the right tank body (6-3) to reach the welding temperature; S4: Controlling the infrared heater (5) to reset, and the left positioning tool (3-1) and the right positioning tool (3-2) continue to move toward the middle positioning tool (4) to make the welding surfaces contact.

3. The infrared welding method for the inner liner of a hydrogen storage tank according to claim 2 is characterized in that: The infrared welding method for the inner liner of the hydrogen storage tank also includes: S5: After the welding surface is cooled, the left positioning tool (3-1) and the right positioning tool (3-2) are controlled to reset, the middle positioning tool (4) is opened, and the welded hydrogen tank liner is taken out.

4. The infrared welding method for the inner liner of a hydrogen storage tank according to claim 2, characterized in that: The S1 includes: S11: controlling the left positioning tool (3-1) to move the left tank body (6-1) to perform clamping and positioning; S12: controlling the right positioning tool (3-2) to move the right tank body (6-3) to perform clamping and positioning; S13: controlling the intermediate positioning tool (4) to move the intermediate tank body (6-2) to clamp and position it; S14: Control the left tank body (6-1), the right tank body (6-3) and the middle tank body (6-2) after clamping and positioning so that they are on the same center line.

5. The infrared welding method for the inner liner of a hydrogen storage tank according to claim 2 is characterized in that: The S2 includes: S21: Control the left positioning tool (3-1) to drive the left tank body (6-1) to move rightward; S22: Control the right positioning tool (3-2) to drive the right tank body (6-3) to move leftward; S23: Control the infrared heater (5) to move forward; S24: Controlling the infrared heater (5) to make the heating area correspond to the welding surface and stopping the movement when the distance between the infrared heater (5) and the welding surface of the intermediate tank body (6-2) reaches a preset distance threshold; S25: Controlling the welding surface of the left tank body (6-1) and the welding surface of the right tank body (6-3) to stop moving when the distance from the infrared heater (5) reaches a preset distance threshold.

6. The infrared welding method for the inner liner of a hydrogen storage tank according to claim 2, characterized in that: The S3 includes: S31: controlling the infrared heater (5) to heat the welding surface; S32: After the welding surface reaches the preset heating temperature, the infrared heater (5) is controlled to stop heating.

7. The infrared welding method for the inner liner of a hydrogen storage tank according to claim 2, characterized in that: The S4 includes: S41: Controlling the infrared heater (5) to quickly move backward and reset; S42: Control the left positioning tool (3-1) to continue to drive the left tank body (6-1) to move rightward; S43: Control the right positioning tool (3-2) to continue to drive the right tank body (6-3) to move leftward; S44: After the welding surfaces are in contact, the left positioning tool (3-1) and the right positioning tool (3-2) stop moving and provide a stable pushing force to the welding surfaces.

8. The infrared welding method for the inner liner of a hydrogen storage tank according to claim 3 is characterized in that: The S5 includes: S51: After the weld is cooled, the left positioning tool (3-1), the right positioning tool (3-2), and the middle positioning tool (4) are controlled to release and open the welded tank body; S52: Control the left positioning tool (3-1) to move leftward to reset; S53: Control the right positioning tool (3-2) to move rightward to reset; S54: Take out the welded tank body.

9. The infrared welding method for the inner liner of a hydrogen storage tank according to claim 5, characterized in that: The preset distance threshold is 3mm-5mm.

10. An infrared welding system, characterized in that: The hydrogen storage tank liner is produced by using the infrared welding equipment for the hydrogen storage tank liner described in claim 1 or the infrared welding method for the hydrogen storage tank liner described in any one of claims 2-9.

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