Hyperbolic expansion sealing device, forming system and rolling method

Abstract

The present invention belongs to the technical field of fluidized bed boilers. A hyperbolic expansion sealing device, used for sealing irregular membrane walls, includes a left-curved expansion sealing portion and a right-curved expansion sealing portion; the left-curved expansion sealing portion and the right-curved expansion sealing portion both include a straight section and a curved section; the cross-sections of the left-curved expansion sealing portion and the right-curved expansion sealing portion both include a U-shaped groove located in the middle and straight side plates arranged on both sides of the U-shaped groove, and the U-shaped groove notches of the left-curved expansion sealing portion and the right-curved expansion sealing portion are relatively fitted. Also disclosed are a molding system for a hyperbolic expansion sealing device and a rolling method for a hyperbolic expansion sealing device. The structural design of the present application is reasonable, and can be used for irregular full-membrane wall structures, and greatly improves the efficiency and quality of pressing, reduces the production cost, and meets the production needs of enterprises.

Description

Technical Field

[0001] The invention belongs to the technical field of fluidized bed boilers, and in particular relates to a hyperbolic expansion sealing device, a forming system and a rolling method. Background Art

[0002] Since the fully suspended furnace of the newly developed circulating fluidized bed boiler 22F0300-0 water-cooling system adopts a full membrane wall structure with five membrane water-cooled walls, and since the expansion direction of the irregular membrane wall is multi-dimensional and uncontrollable, a conventional sealing device with controllable expansion direction cannot be used: that is, a sealing plug.

[0003] Due to the irregular shape of the furnace membrane wall, it is necessary to design a corresponding hyperbolic expansion sealing device. The shape of this hyperbolic expansion sealing device is also irregular with the shape of the furnace membrane wall. The bending radii of the hyperbolic expansion sealing device are R1700, R1300, and R305, and the bending position and the length of the straight section of each hyperbolic expansion sealing device are different. The left and right hyperbolic expansion sealing devices are used in conjunction. Therefore, there are many types of hyperbolic expansion sealing devices. If the bending mold is pressed on a press according to the conventional design, the mold size is large, the types are many, the production cost is high, and the production cycle is long, it is difficult to meet the product production period requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a hyperbolic expansion sealing device, a molding system and a rolling method in view of the above-mentioned problems and shortcomings. The device has a reasonable structural design and can be used for irregular full-membrane wall structures. It also greatly improves the efficiency and quality of pressing, reduces the production cost and meets the production needs of enterprises.

[0005] To achieve the above purpose, the technical solution adopted is:

[0006] A hyperbolic expansion sealing device, used for sealing an irregular membrane wall, comprises a left curved expansion sealing portion and a right curved expansion sealing portion which are arranged in a corresponding buckling manner on the left and right; the left curved expansion sealing portion and the right curved expansion sealing portion both comprise:

[0007] A straight line segment, a plurality of straight line segments are arranged to match and correspond to the straight line portion of the irregular membrane wall; and

[0008] A curved section, wherein a plurality of curved sections are arranged to match and correspond to the curved portion of the irregular membrane wall;

[0009] The cross-sections of the left curved expansion sealing part and the right curved expansion sealing part both include a U-shaped groove in the middle and straight side plates arranged on both sides of the U-shaped groove, and the U-shaped groove openings of the left curved expansion sealing part and the right curved expansion sealing part are relatively fitted.

[0010] According to the hyperbolic expansion sealing device of the present invention, preferably, the left curved expansion sealing portion and the right curved expansion sealing portion are both made of high chromium-nickel heat-resistant austenitic stainless steel.

[0011] A hyperboloid expansion sealing device molding system is used for producing and processing the hyperboloid expansion sealing device, comprising a bending die device and a plate rolling device; the bending die device comprises:

[0012] A lower die, the lower die being provided with a lower pressing groove matching the U-shaped groove;

[0013] an upper die, the upper die being provided with an upper pressing head corresponding to the lower pressing groove; and

[0014] A press, which drives the lower die and the upper die to move relative to each other and presses the straight plate into a straight expansion sealing plate with a U-shaped groove and a straight side plate;

[0015] The plate rolling device comprises:

[0016] Plate rolling machine;

[0017] Two corresponding lower rollers are arranged on the plate rolling machine;

[0018] An upper roller is arranged at the middle upper part of the two lower rollers, and a lifting driving part for driving the lifting action of the upper roller is arranged on the plate rolling machine;

[0019] An upper roller jacket, which is mounted on the upper roller, and a first jacket groove corresponding to the U-shaped groove of the straight expansion sealing plate is formed on the circumferential end surface of the upper roller jacket; and

[0020] A lower roller jacket, which is mounted on the lower roller, and a second jacket groove corresponding to the U-shaped groove of the straight expansion sealing plate is opened on the circumferential section of the lower roller jacket;

[0021] When the U-shaped grooves of the left curved surface expansion sealing part and the right curved surface expansion sealing part bend inwardly, the upper roller is equipped with an upper roller jacket; when the U-shaped grooves of the left curved surface expansion sealing part and the right curved surface expansion sealing part bend outwardly, the two lower rollers are equipped with lower roller jackets.

[0022] According to the hyperbolic expansion sealing device forming system of the present invention, preferably, the upper roller jacket and the lower roller jacket each include two semicircular half-ring shoe-type jackets, and both ends of the two half-ring shoe-type jackets are connected and fixed by bolts.

[0023] According to the hyperbolic expansion sealing device molding system of the present invention, preferably, a demolding unit is provided at the bottom of the lower pressure groove of the lower mold.

[0024] According to the hyperbolic expansion sealing device molding system of the present invention, preferably, the demoulding unit is a plurality of elastic unloading blocks arranged at the bottom of the lower pressing groove.

[0025] According to the hyperbolic expansion sealing device molding system of the present invention, preferably, two positioning strips are provided on the upper end surface of the lower mold, and the two positioning strips are correspondingly arranged on both sides of the lower pressing groove.

[0026] A rolling method for a hyperbolic expansion sealing device, using the above-mentioned hyperbolic expansion sealing device forming system to roll and form a left-curved expansion sealing part and a right-curved expansion sealing part, specifically comprising the following steps:

[0027] Assembling the upper die and the lower die assembly on the press machine and completing the debugging;

[0028] Select a plate to be processed according to the theoretical expansion length of the left curved surface expansion sealing part or the right curved surface expansion sealing part, place the plate to be processed on the pressing station of the lower mold, start the press, and press the plate to be processed into a straight expansion sealing plate;

[0029] Determining the bending radius, bending direction and processing steps of each section of the left curved surface expansion sealing portion or the right curved surface expansion sealing portion;

[0030] The height of the upper roller of the plate rolling device is adjusted according to the bending radius of the section to be processed, and the upper roller jacket is installed on the upper roller or the lower roller jacket is installed on the lower roller according to the bending direction, and the rolling and forming of each bending section is carried out in sequence.

[0031] According to the rolling method of the hyperbolic expansion sealing device of the present invention, preferably, the plate to be processed is 100 mm to 300 mm longer than the theoretical unfolding length of the left curved expansion sealing portion or the right curved expansion sealing portion.

[0032] According to the rolling method of the hyperbolic expansion sealing device of the present invention, preferably, it also includes a bending radius inspection ruler, and during the rolling forming process of the bending section, the bending radius inspection ruler is used to perform measurement and verification.

[0033] The beneficial effects achieved by adopting the above technical solution are:

[0034] This application is based on repeated demonstrations of a variety of molding processing technology solutions. According to the product drawings, the shape characteristics, size, and precision requirements of the workpiece are analyzed. On the basis of process analysis, various possible process solutions are proposed. Comprehensive comparisons and analyses are made from aspects such as product quality, production efficiency, difficulty of mold making, and ease of operation. The most technically reasonable and lowest manufacturing cost solution is selected.

[0035] The present application can realize the forming and pressing of the U-shaped groove through the bending die device, and can roll the straight expansion sealing plate with the U-shaped groove through the rolling device, thereby realizing the production of the hyperbolic expansion sealing device, effectively solving the technical difficulties in the production and forming of the structure in the prior art, greatly improving the production efficiency, reducing the production cost, and being able to meet the pressing and forming of different sizes and different radii. It is more practical and more conducive to promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention, wherein the drawings are only used to illustrate some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0037] Figure 1 Schematic diagram of the structure of a hyperbolic expansion sealing device according to an embodiment of the present invention.

[0038] Figure 2 for Figure 1 Schematic diagram of the AA structure.

[0039] Figure 3 for Figure 1 Schematic diagram of the structure of direction B in FIG.

[0040] Figure 4 for Figure 3 Schematic diagram of the side structure.

[0041] Figure 5 It is a schematic diagram of the cross-sectional structure of a left curved surface expansion sealing portion or a right curved surface expansion sealing portion according to an embodiment of the present invention.

[0042] Figure 6 Schematic diagram of the structure of the upper die and the lower die in the bending die device according to an embodiment of the present invention.

[0043] Figure 7 Schematic diagram of the structure of the upper roller and the upper roller jacket of the plate rolling device according to an embodiment of the present invention.

[0044] Figure 8 for Figure 7 Schematic diagram of the left view structure.

[0045] Fig. 9 Schematic diagram of the structure of the lower roller and the lower roller jacket of the plate rolling device according to an embodiment of the present invention.

[0046] Fig.10 for Fig. 9 Schematic diagram of the left view structure.

[0047] Fig.11 Schematic diagram of the working state of the upper roller jacket of the plate rolling device according to an embodiment of the present invention.

[0048] Fig.12 for Fig.11 Schematic diagram of the left view structure.

[0049] Fig.13 Schematic diagram of the working state of the lower roller jacket of the plate rolling device according to an embodiment of the present invention.

[0050] Fig.14 for Fig.13 Schematic diagram of the left view structure.

[0051] Fig.15 The figure is a schematic diagram showing the specific dimensions of each section of a hyperbolic expansion sealing device.

[0052] Fig.16 A schematic diagram showing the specific dimensions of the U-shaped groove and the straight side plate of one type of hyperbolic expansion sealing device.

[0053] Serial number in the picture:

[0054] 110 is a straight section, 120 is a curved section, 130 is a right curved expansion sealing portion, 140 is a left curved expansion sealing portion, 141 is a U-shaped groove, and 142 is a straight side plate;

[0055] 201 is the lower die, 202 is the upper die, 203 is the lower pressing groove, 204 is the upper pressing head, 205 is the positioning bar, and 206 is the elastic unloading block;

[0056] 301 is an upper roller, 302 is a lower roller, 303 is an upper roller jacket, 304 is a lower roller jacket, 305 is a first jacket groove, 306 is a second jacket groove, and 307 is a bolt. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings of specific embodiments of the present invention to clearly and completely describe the exemplary scheme of the embodiment of the present invention. Unless otherwise defined, the technical terms or scientific terms used in the present invention should be the common meanings understood by people with ordinary skills in the field.

[0058] In the description of the present invention, it should be understood that the expressions “first” and “second” are used to describe the various elements of the present invention and do not represent any limitation of order, quantity or importance, but are only used to distinguish one component from another.

[0059] It should be noted that when one element is “connected”, “coupled” or “connected” to another element, it may mean that they are directly connected, coupled or connected, but it should be understood that there may be intermediate elements between the two; that is, the positional relationships of direct connection and indirect connection are covered.

[0060] It should be noted that the use of "a" or "an" and similar words does not necessarily indicate a quantitative limitation. "Include" or "comprising" and similar words mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects.

[0061] It should be noted that terms such as "up", "down", "left" and "right" indicating orientation or positional relationship are only used to indicate relative positional relationship. This is for the convenience of describing the present invention and does not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0062] See also Figure 1-Figure 4 A hyperbolic expansion sealing device is used for sealing irregular membrane walls, comprising a left-curved expansion sealing portion 140 and a right-curved expansion sealing portion 130 which are arranged in a corresponding snap-fit ​​arrangement on the left and right sides; the left-curved expansion sealing portion 140 and the right-curved expansion sealing portion 130 both comprise a straight segment 110 and a curved segment 120, and a plurality of straight segments 110 are arranged to match and correspond to the straight segments of the irregular membrane wall; a plurality of curved segments 120 are arranged to match and correspond to the curved segments of the irregular membrane wall; the cross sections of the left-curved expansion sealing portion 140 and the right-curved expansion sealing portion 130 both comprise a U-shaped groove 141 in the middle and straight side plates 142 arranged on both sides of the U-shaped groove 141, and the notches of the U-shaped groove 141 of the left-curved expansion sealing portion 140 and the right-curved expansion sealing portion 130 are arranged to fit relatively.

[0063] The left curved surface expansion seal portion 140 and the right curved surface expansion seal portion 130 are both made of high chromium-nickel heat-resistant austenitic stainless steel.

[0064] See also Figure 5-Figure 11The present application also discloses a forming system for a hyperbolic expansion sealing device for producing and processing a hyperbolic expansion sealing device, specifically comprising a bending die device and a plate rolling device; the bending die device comprises a lower die 201, an upper die 202 and a press, the lower die 201 is provided with a lower pressing groove 203 corresponding to the U-shaped groove 141; the upper die 202 is provided with an upper pressing head 204 corresponding to the lower pressing groove 203; the press drives the lower die 201 and the upper die 202 to move relative to each other, and presses the straight plate into a straight expansion sealing plate with a U-shaped groove and a straight side plate; the plate rolling device comprises a plate rolling machine, two correspondingly arranged lower rollers 302, an upper roller 301, an upper roller jacket 304 and a lower roller jacket 305, the lower roller 302 is arranged on the plate rolling machine; the upper roller 301 is arranged between the two lower rollers 302 At the upper part, a lifting drive unit for driving the upper roller 301 to lift and lower is arranged on the plate rolling machine; an upper roller jacket 303 is assembled and arranged on the upper roller 301, and a first jacket groove 305 corresponding to the U-shaped groove of the straight expansion sealing plate is opened on the circumferential end surface of the upper roller jacket 303; a lower roller jacket 304 is assembled and arranged on the lower roller 302, and a second jacket groove 306 corresponding to the U-shaped groove 141 of the straight expansion sealing plate is opened on the circumferential section of the lower roller jacket 304; when the U-shaped grooves 141 of the left curved surface expansion sealing part 140 and the right curved surface expansion sealing part 130 are bent inwardly, the upper roller jacket 303 is assembled on the upper roller 301; when the U-shaped grooves 141 of the left curved surface expansion sealing part 140 and the right curved surface expansion sealing part 130 are bent outwardly, the lower roller jackets 304 are assembled on the two lower rollers 302. The upper roller jacket 303 and the lower roller jacket 304 in the above structure both include two semicircular half-ring shoe-type jackets, and the two ends of the two half-ring shoe-type jackets are connected and fixed by bolts 307 .

[0065] A demoulding unit is provided at the bottom of the lower pressing groove 203 of the lower mold 201. The demoulding unit is a plurality of elastic demoulding blocks 206 arranged at the bottom of the lower pressing groove, such as demoulding rubber blocks or demoulding rubber blocks. In order to facilitate the positioning of the plate to be processed and to ensure the quality of pressing, two positioning strips 205 are provided on the upper end surface of the lower mold 201 of the present application. The two positioning strips 205 are arranged on both sides of the lower pressing groove 203 respectively.

[0066] The present application also discloses a rolling method for a hyperbolic expansion sealing device, which uses the above-mentioned hyperbolic expansion sealing device molding system to roll and form the left-curved expansion sealing part 140 and the right-curved expansion sealing part 130, and specifically includes the following steps: assembling the upper mold 202 and the lower mold 201 on the press and completing the debugging; selecting the plate to be processed according to the theoretical unfolding length of the left-curved expansion sealing part 140 or the right-curved expansion sealing part 130, and placing the plate to be processed on the pressing station of the lower mold 201 accordingly, starting the press, and pressing the plate to be processed into a straight expansion sealing plate; determining the bending radius, bending direction and processing steps of each section of the left-curved expansion sealing part 140 or the right-curved expansion sealing part 130; adjusting the height of the upper roller 301 of the rolling device according to the bending radius of the section to be processed, and assembling the upper roller jacket 303 on the upper roller 301 or the lower roller jacket 304 on the lower roller 302 according to the bending direction, and rolling and forming each bending section 120 in turn.

[0067] The plate to be processed is 100 mm to 300 mm longer than the theoretical unfolding length of the left curved surface expansion sealing portion 140 or the right curved surface expansion sealing portion 130 .

[0068] The present application also includes a bending radius inspection ruler, which is used to perform measurement and inspection during the roll forming process of the bending section 120 .

[0069] This application describes in detail the specific working steps during the specific application process:

[0070] To manufacture Fig.12 and Fig.13 A hyperbolic expansion seal of the dimensions shown is used as an example.

[0071] This application selects a reasonable gap value between the upper and lower dies. The mold is suitable for equipment: YH32-315 press machine. The upper and lower dies are made of 45# steel with high strength and hardness. Heat treatment requirements: quenching HRC40~45. The upper and lower dies are easy to process, and the mold manufacturing process is good. After the straight expansion sealing plate is pressed and welded, the straight expansion sealing plate workpiece according to the theoretical expansion length is obtained, and then rolled on a 25mm plate rolling machine to form a hyperbolic expansion sealing device.

[0072] The structure of the 25mm plate rolling machine is a three-roller symmetrical type, which is easy to operate. The diameter of the upper roller of the 25mm plate rolling machine is 345mm, the diameter of the lower roller is 280mm, and the distance between the two lower rollers is 440mm. The upper roller is driven by a screw, a nut, and a worm to make vertical lifting and lowering movements in the central symmetrical position of the two lower rollers. The two lower rollers rotate in mesh with the lower roller gear through the output gear of the reducer to provide torque for the rolled workpiece. At the same time, a semi-ring tile-type jacket installed on the upper and lower rollers that matches the cross-sectional shape of the expansion seal device is made and installed on the upper or lower roller with bolts. When the hyperboloid expansion seal device bends inward, a set of semi-ring tile-type jackets is installed on the upper roller, and when the hyperboloid expansion seal device bends outward, a set of semi-ring tile-type jackets is installed in parallel on the two lower rollers.

[0073] The half-ring tile type is bolted to the upper roller or the lower roller. The bolt connection is easy to load and unload, and the end face of the jacket ring is perpendicular to the roller axis. When the jacket is installed, the straight expansion sealing plate is prepared with a straight edge cut head of about 130mm. The splicing welds that contact the upper and lower roller surfaces of the plate rolling machine should be polished and flush. The straight expansion sealing plate that has been spliced ​​and pressed on the press is placed in the jacket groove. The straight expansion sealing plate can be introduced and the plate rolling machine is started to bend the straight expansion sealing plate. When the upper roller presses down and exceeds the yield limit of the material, the straight expansion sealing device will produce plastic deformation. As the three rollers rotate, an arc is formed. The outer fiber of this arc is stretched, the inner layer is squeezed, and the neutral layer remains unchanged. According to the operating method of the plate rolling, the sealing device can be bent inward or outward to become a hyperbolic expansion sealing device. Since the three rollers of the plate rolling machine are symmetrical, the front and rear forces of the straight expansion sealing plate are relatively uniform during the bending process, so the springback and precision problems of the hyperboloid expansion sealing device can be solved well. When the plate rolling machine is started to roll the hyperboloid expansion sealing device, the sample of the bending radius size of the workpiece drawing can be used for inspection at any time. When the size requirements are met, the machine is stopped and the workpiece is removed. A wooden bending radius inspection ruler can be used for the corresponding bending radius inspection.

[0074] The quality of the hyperboloid expansion seal device after forming is in full compliance with the drawings and standard requirements. After the hyperboloid expansion seal device bending device was put into use, the production cost of the product was reduced, and the update of process equipment further improved the manufacturing process level of the enterprise.

[0075] The preferred embodiments for implementing the present invention have been described in detail above, but it should be understood that the role of these embodiments is only to exemplify, and is not intended to limit the scope, applicability or configuration of the present invention in any way. The protection scope of the present invention is defined by the attached claims and their equivalents. A person of ordinary skill in the art can make many changes to the above embodiments under the guidance of the present invention, and these changes all fall within the protection scope of the present invention.

Claims

1. A hyperboloid expansion sealing device molding system, used for producing and processing a hyperboloid expansion sealing device, characterized in that: The hyperbolic expansion sealing device is used for sealing irregular membrane walls; It includes a left curved surface expansion sealing part and a right curved surface expansion sealing part which are arranged in a corresponding buckling manner on the left and right sides; the left curved surface expansion sealing part and the right curved surface expansion sealing part each include: A straight line segment, a plurality of straight line segments are arranged to match and correspond to the straight line portion of the irregular membrane wall; and A curved section, wherein a plurality of curved sections are arranged to match and correspond to the curved portion of the irregular membrane wall; The cross sections of the left curved surface expansion sealing part and the right curved surface expansion sealing part each include a U-shaped groove located in the middle and straight side plates arranged on both sides of the U-shaped groove, and the U-shaped groove notches of the left curved surface expansion sealing part and the right curved surface expansion sealing part are relatively fitted; The hyperbolic expansion sealing device molding system, It includes a bending die device and a plate rolling device; the bending die device includes: A lower die, the lower die being provided with a lower pressing groove matching the U-shaped groove; an upper die, the upper die being provided with an upper pressing head corresponding to the lower pressing groove; and A press, which drives the lower die and the upper die to move relative to each other and presses the straight plate into a straight expansion sealing plate with a U-shaped groove and a straight side plate; The plate rolling device comprises: Plate rolling machine; Two corresponding lower rollers are arranged on the plate rolling machine; An upper roller is arranged at the middle upper part of the two lower rollers, and a lifting driving part for driving the lifting action of the upper roller is arranged on the plate rolling machine; An upper roller jacket, which is mounted on the upper roller, and a first jacket groove corresponding to the U-shaped groove of the straight expansion sealing plate is formed on the circumferential end surface of the upper roller jacket; and A lower roller jacket, which is mounted on the lower roller, and a second jacket groove corresponding to the U-shaped groove of the straight expansion sealing plate is opened on the circumferential section of the lower roller jacket; When the U-shaped grooves of the left curved surface expansion sealing part and the right curved surface expansion sealing part bend inwards, the upper roller jacket is installed on the upper roller; when the U-shaped grooves of the left curved surface expansion sealing part and the right curved surface expansion sealing part bend outwards, the lower roller jackets are installed on the two lower rollers; A demoulding unit is provided at the bottom of the lower pressing groove of the lower die; Two positioning strips are arranged on the upper end surface of the lower die, and the two positioning strips are arranged correspondingly on both sides of the lower pressing groove.

2. A hyperbolic expansion sealing device molding system according to claim 1, characterized in that: The left curved surface expansion sealing part and the right curved surface expansion sealing part are both made of high chromium-nickel heat-resistant austenitic stainless steel.

3. The hyperbolic expansion sealing device molding system according to claim 1, characterized in that: The upper roller jacket and the lower roller jacket both include two semicircular half-ring shoe-type jackets, and the two ends of the two half-ring shoe-type jackets are connected and fixed by bolts.

4. The hyperbolic expansion sealing device molding system according to claim 1, characterized in that: The demoulding unit is a plurality of elastic unloading blocks arranged at the bottom of the lower pressing groove.

5. A method for rolling a hyperbolic expansion sealing device, characterized in that: The roll forming of the left curved surface expansion sealing part and the right curved surface expansion sealing part is performed by using the molding system of the hyperbolic surface expansion sealing device according to any one of claims 1 to 4, specifically comprising the following steps: Assembling the upper die and the lower die assembly on the press machine and completing the debugging; Select a plate to be processed according to the theoretical expansion length of the left curved surface expansion sealing part or the right curved surface expansion sealing part, place the plate to be processed on the pressing station of the lower mold, start the press, and press the plate to be processed into a straight expansion sealing plate; Determining the bending radius, bending direction and processing steps of each section of the left curved surface expansion sealing portion or the right curved surface expansion sealing portion; The height of the upper roller of the plate rolling device is adjusted according to the bending radius of the section to be processed, and the upper roller jacket is installed on the upper roller or the lower roller jacket is installed on the lower roller according to the bending direction, and the rolling and forming of each bending section is carried out in sequence.

6. The rolling method of the hyperbolic expansion sealing device according to claim 5, characterized in that: The plate to be processed is 100 mm to 300 mm longer than the theoretical unfolding length of the left curved surface expansion sealing portion or the right curved surface expansion sealing portion.

7. The rolling method of the hyperbolic expansion sealing device according to claim 5, characterized in that: It also includes a bending radius inspection ruler, which is used to perform measurement and inspection during the roll forming process of the bending section.

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