Fixing and protecting device and method for transportation of large-size thin-wall spray pipe extension section

Abstract

A fixing and protecting device and method for transportation of a large-size thin-wall nozzle extension section are used for fixing a rocket engine nozzle extension section with a coating and preventing the rocket engine nozzle extension section from being polluted, collided and scratched in the turnover or transportation process. By designing the large-size thin-wall spray pipe extension section turnover parking and transporting device, the problem that products are difficult to turnover parking and transport due to large size and poor rigidity of the sprayed thin-wall spray pipe extension section is solved; by designing the coating protective cover cloth for the large-size thin-wall spray pipe extension section, coating protection of the spray pipe extension section before boxing and after unboxing is achieved, and the situation that the use performance of a product is affected due to the fact that the spray pipe extension section is exposed on a tool site and the coating is polluted is avoided.

Description

Technical Field

[0001] This invention relates to a fixing and protection device and method for transporting large-size thin-walled nozzle extensions, belonging to the field of rocket engine nozzle technology. Background Technology

[0002] The single-walled nozzle extension section is a crucial component of vacuum-powered engines; a larger nozzle area ratio results in higher engine performance. Currently, existing technology commonly produces a certain type of large-sized, thin-walled high-altitude engine nozzle extension section, with a small-end flange diameter greater than 1000mm, a large-end diameter greater than 3000mm, a height greater than 3000mm, and a thickness less than 0.8mm. Due to the large size, poor rigidity, and difficulty in manual assembly / disassembly of the thin-walled short nozzle extension section, higher protective requirements are placed on its handling and transportation.

[0003] Large-sized single-walled nozzle extension sections are typically assembled using precious metals through high-energy beam welding. A heat-insulating coating is then applied to both the inner and outer surfaces to improve the wall temperature margin during operation. If the inner or outer surfaces of the thin-walled extension section are accidentally damaged or the coating contaminated during handling and transportation, its performance will be severely affected. In severe cases, the thin-walled extension section may be burned, leading to launch failure. Summary of the Invention

[0004] The technical problem solved by this invention is to address the various factors that cause launch failure in the existing technology by proposing a fixing and protection device and method for transporting large-size thin-walled nozzle extension sections.

[0005] The present invention solves the above-mentioned technical problem through the following technical solution:

[0006] A fixing and protection device for transporting large-size thin-walled nozzle extension sections includes a support ring, a protective pad, a base, an auxiliary stop, bolts, nuts, and a universal rotating lifting ring. The support ring has a jig-like structure and is located on the outer side of the thin-walled nozzle extension section near the small end face, fitting snugly against the local profile of the small end. The protective pad is located below the support ring, providing support for the thin-walled nozzle extension section and protecting its coating from impacts or scratches. The base is connected to the support ring by bolts and nuts. The auxiliary stop is located on the axial outer side of the base, used to fix and limit the large end of the thin-walled nozzle extension section. The universal rotating lifting ring is located below the base, and during the turnover of the thin-walled nozzle extension section, the base is rotated using the universal rotating lifting ring located at the bottom edge of the base.

[0007] The flange portion of the thin-walled nozzle extension is integrally assembled and connected to the connecting device. The thin-walled nozzle extension is hoisted via the connecting device, which includes a cover plate assembly, a pad plate assembly, and a lifting hook, wherein:

[0008] The cover plate assembly is fitted to the upper surface of the flange of the thin-walled nozzle extension section, and the bolt holes at the fitting position of the cover plate assembly are aligned with the flange holes on the upper surface of the flange; the gasket assembly corresponds to the cover plate assembly and is screwed to fix it, and is used to protect the spray coating on the upper and lower surfaces of the flange part of the thin-walled nozzle extension section.

[0009] The cover plate assembly includes a cover plate and a first protective gasket. The cover plate is provided with bolt holes, extension section flange connection holes, weight reduction holes, and hook threaded holes. The first protective gasket is provided with flange connection holes. The cover plate and the first protective gasket are connected through the flange connection holes. The cover plate is connected to the flange holes on the upper surface of the flange of the thin-walled nozzle extension section through the bolt holes. The hook threaded holes are used to realize the lifting bolt connection of the cover plate. The weight reduction holes are used to realize the weight reduction of the cover plate assembly.

[0010] The flange connection holes are evenly distributed on the edge of the cover plate. Each set of flange connection holes is set to be the same as the bolt hole specifications on the upper surface of the flange of the thin-walled nozzle extension section. The first protective gasket material is polytetrafluoroethylene and is connected to the cover plate by adhesive. The first protective gasket is set between the cover plate and the flange of the thin-walled nozzle extension section. The first protective gasket is used to protect the upper surface of the flange of the thin-walled nozzle extension section.

[0011] During installation, the gasket assembly is evenly distributed around the flange edge of the thin-walled nozzle extension section. The gasket assembly includes a fan-shaped plate and a second protective gasket. The fan-shaped plate and the second protective gasket are fixed by adhesive bonding to protect the lower surface of the flange of the thin-walled nozzle extension section.

[0012] The flange portion of the thin-walled nozzle extension section is an integral structure with the connecting device. After hoisting, it is placed in a special membrane in the transport box. The special membrane is connected to the support of the transport box. The material used is aviation foam. The shape of the special membrane is designed to match the arc-shaped inner surface of the thin-walled nozzle extension section. The special membrane has axial through grooves evenly distributed around its circumference to prevent the thin-walled nozzle extension section from sticking together after placement. A circumferential through groove is set in the middle of the special membrane. A membrane sleeve with the same color as the spray coating of the thin-walled nozzle extension section is installed on the outer surface of the special membrane. The membrane sleeve is made of pure cotton cloth.

[0013] The connecting device is assembled and fixed with the limiting component of the transport box. The limiting device includes a transport box bracket and a limiting component. The transport box bracket and the transport box base are assembled by welding. The limiting component and the transport box bracket are assembled by spot welding or intermittent argon arc welding. The extension section and the connecting device are placed behind a special tire membrane. The connecting device and the limiting device are threaded together by long bolts and hexagonal nuts, so that the connecting device, the limiting component and the thin-walled nozzle extension section are mutually constrained.

[0014] The limiting assembly includes a circular plate, long bolts, hexagonal nuts, spring washers, pins, and pin holes. The circular plate has four long bolt through holes, which correspond one-to-one with the four long bolt holes on the cover plate, used to limit the axial and circumferential positions of the thin-walled nozzle extension section. The transport box bracket is fixed to the circular plate by argon arc welding, and the large cylindrical end of the long bolt is fixed to the circular plate by argon arc welding. Both the long bolt and the hexagonal nut require the installation of spring washers for loosening. The small end of the long bolt has a spherical structure and is provided with a pin hole for insertion, preventing the hexagonal nut and spring washer connected to the long bolt from shaking and falling off during transportation.

[0015] The conical cover is made of wear-resistant soft cotton cloth. The color of the conical cover is consistent with the appearance of the coating on the extension section of the thin-walled nozzle. The conical cover is filled with sponge material and sewn in place. The conical cover has an opening along the generatrix direction. Velcro is sewn at the opening. The width of the Velcro on the left and right staggered crimping part of the opening is not less than a preset range. The small end of the conical cover has two straps of the same length, which are used to wrap around the flange part of the extension section of the thin-walled nozzle for binding and preventing the conical cover from slipping.

[0016] After the lid of the transport box is covered with a rainproof cover, the base of the transport box and the lid are combined, and a rainproof cover or rainproof canvas is added to the outside of the box to prevent the transport box from getting wet during transportation. When the transport box is hoisted and transferred, the tilt angle of the box is less than a preset value. The universal rotating lifting ring on the base of the transport box is used for the turnover and transportation of the transport box. A moisture-proof box for storing moisture-proof sand is installed on the base of the transport box for moisture protection. At the same time, a positioning block is installed, which is fixed to the base of the transport box by adhesive and nails.

[0017] A method for fixing and protecting using fixing and protective devices, comprising:

[0018] Apply a heat-insulating coating to the inner surface, outer surface, and flange surface of the thin-walled nozzle extension section, and then place the coated thin-walled nozzle extension section on a parking rack for fixation and turnover.

[0019] A connecting device is installed on the flange of the thin-walled nozzle extension section. The connecting device and the thin-walled nozzle extension section are assembled into an integral structure and then reused.

[0020] After the heat insulation coating is applied, the thin-walled nozzle extension section and connecting device are hoisted onto the membrane, ensuring that the thin-walled nozzle extension section does not collide with the surrounding environment, and that the thin-walled nozzle extension section is placed vertically with the large end of the nozzle pointing downwards towards the ground.

[0021] The flange top of the thin-walled nozzle extension section is positioned axially and circumferentially by a limiting device.

[0022] A conical tarpaulin is installed on the outer surface of the thin-walled nozzle extension to cover and protect the heat insulation coating on the outer surface.

[0023] The thin-walled nozzle extension, covered by a conical tarpaulin, will be boxed for transport.

[0024] The advantages of this invention compared to the prior art are:

[0025] (1) The present invention provides a fixing and protection device and method for transporting large-size thin-walled nozzle extension sections. It designs a turnover, parking and transportation device for large-size thin-walled nozzle extension sections, which solves the problem of difficult product turnover, parking and transportation caused by the large size and poor rigidity of the thin-walled nozzle extension sections after spraying. It also designs a coating protective cover for large-size thin-walled nozzle extension sections, which realizes coating protection of the nozzle extension sections before and after packing and unpacking, and avoids the nozzle extension sections from being exposed in the tooling site, which would cause the coating to be contaminated and thus affect the performance of the product.

[0026] (2) This invention solves the problem that the large-size thin-walled nozzle extension section transportation box shakes after long-distance travel and is difficult to remove by manpower alone by cleverly designing the limiting device, connecting device and assembly structure of the transport box and the small end flange of the thin-walled extension section. It realizes the coating protection of the thin-walled nozzle extension section and semi-automatic packing / unpacking. Attached Figure Description

[0027] Figure 1 A schematic diagram of the parking rack for the large-size thin-walled nozzle extension section provided by the present invention;

[0028] Figure 2 A schematic diagram of the transport box for the large-size thin-walled nozzle extension section provided by the present invention;

[0029] Figure 3 A schematic diagram of the connection device for the transport box provided by the present invention;

[0030] Figure 4 A schematic diagram of the cover plate of the connecting device provided by the present invention;

[0031] Figure 5 A schematic diagram of the limiting component for the transport box provided by the present invention;

[0032] Figure 6 A schematic diagram of the tire membrane of the transport box provided by the present invention;

[0033] Figure 7 A schematic diagram of the cover fabric of the transport box provided by the present invention;

[0034] Figure 8 This is a schematic diagram of the connection between the lid and the base provided by the present invention;

[0035] Figure 9This is a schematic diagram of the rainproof cover for the transport box provided by the present invention. Detailed Implementation

[0036] Designing suitable methods for transporting, securing, and protecting the coating of large-sized thin-walled nozzle extension sections, while simultaneously achieving semi-automatic loading / unpacking of these sections, is a crucial problem urgently needing to be solved by those skilled in the art. Based on this, the present invention provides a method for securing and protecting large-sized thin-walled nozzle extension sections during transport. This invention designs a device and method for securing and protecting large-sized thin-walled nozzle extension sections during transport, used to secure coated rocket engine nozzle extension sections and prevent coating contamination and scratches during handling or transportation. By designing a handling, parking, and transport device for large-sized thin-walled nozzle extension sections, the problem of difficult handling, parking, and transportation of coated thin-walled nozzle extension sections due to their large size and poor rigidity is solved. By designing a protective cover for the coating of large-sized thin-walled nozzle extension sections, coating protection is achieved before and after packing, preventing coating contamination caused by exposure to tooling areas, thus avoiding impact on product performance.

[0037] The structure of the fixing and protective device is designed as follows:

[0038] The system includes a support ring, protective pad, base, auxiliary stop, bolts, nuts, and a universal rotating lifting ring. The support ring is a jig-like structure, positioned on the outer side of the thin-walled nozzle extension section near the small end face, and conforms to the local profile of the small end of the thin-walled nozzle extension section. The protective pad is located below the support ring, providing support for the thin-walled nozzle extension section and protecting its coating from impacts or scratches. The base is connected to the support ring by bolts and nuts. The auxiliary stop is located on the axial outer side of the base, used to fix and limit the large end of the thin-walled nozzle extension section. The universal rotating lifting ring is located below the base, allowing the base to be rotated during the handling of the thin-walled nozzle extension section via the universal rotating lifting ring located at the bottom edge of the base.

[0039] The flange portion of the thin-walled nozzle extension section is integrally assembled and connected with the connecting device. The thin-walled nozzle extension section is hoisted via the connecting device, which includes a cover plate assembly, a gasket assembly, and a lifting hook, wherein:

[0040] The cover plate assembly is fitted to the upper surface of the flange of the thin-walled nozzle extension section, and the bolt holes at the fitting position of the cover plate assembly are aligned with the flange holes on the upper surface of the flange; the gasket assembly corresponds to the cover plate assembly and is screwed to fix it, and is used to protect the spray coating on the upper and lower surfaces of the flange part of the thin-walled nozzle extension section.

[0041] The cover plate assembly includes a cover plate and a first protective gasket. The cover plate is provided with bolt holes, extension section flange connection holes, weight reduction holes and hook threaded holes. The first protective gasket is provided with flange connection holes. The cover plate and the first protective gasket are connected through the flange connection holes. The cover plate is connected to the flange holes on the upper surface of the flange of the thin-walled nozzle extension section through the bolt holes. The hook threaded holes are used to realize the lifting bolt connection of the cover plate. The weight reduction holes are used to realize the weight reduction of the cover plate assembly.

[0042] Flange connection holes are evenly distributed on the edge of the cover plate. Each set of flange connection holes is set to the same specifications as the bolt holes on the upper surface of the flange of the thin-walled nozzle extension section. The first protective gasket material is polytetrafluoroethylene and is connected to the cover plate by adhesive. The first protective gasket is set between the cover plate and the flange of the thin-walled nozzle extension section. The first protective gasket is used to protect the upper surface of the flange of the thin-walled nozzle extension section.

[0043] During installation, the gasket assembly is evenly distributed around the flange edge of the thin-walled nozzle extension section. The gasket assembly includes a fan-shaped plate and a second protective gasket. The fan-shaped plate and the second protective gasket are fixed by adhesive bonding to protect the lower surface of the flange of the thin-walled nozzle extension section.

[0044] The flange portion of the thin-walled nozzle extension section is an integral structure with the connecting device. After hoisting, it is placed in a special membrane in the transport box. The special membrane is connected to the support of the transport box and is made of aviation foam material. The shape of the special membrane is designed to match the arc-shaped inner surface of the thin-walled nozzle extension section. The special membrane has axial grooves evenly distributed around its circumference to prevent the thin-walled nozzle extension section from sticking together after placement. The special membrane has a circumferential groove in the middle. The outer surface of the special membrane is fitted with a membrane sleeve that matches the color of the spray coating of the thin-walled nozzle extension section. The membrane sleeve is made of pure cotton cloth.

[0045] The connecting device is assembled and fixed with the limiting component of the transport box. The limiting device includes the transport box bracket and the limiting component. The transport box bracket and the transport box base are assembled by welding. The limiting component and the transport box bracket are assembled by spot welding or intermittent argon arc welding. The extension section and the connecting device are placed behind a special tire membrane. The connecting device and the limiting device are threaded together with long bolts and hexagonal nuts, so that the connecting device, the limiting component and the thin-walled nozzle extension section are mutually constrained.

[0046] The limiting assembly includes a circular plate, long bolts, hexagonal nuts, spring washers, pins, and pin holes. The circular plate has four long bolt through holes, which correspond one-to-one with the four long bolt holes on the cover plate, used to limit the axial and circumferential position of the thin-walled nozzle extension section. The transport box bracket is fixed to the circular plate by argon arc welding, and the large cylindrical part of the long bolt is fixed to the circular plate by argon arc welding. Both the long bolt and the hexagonal nut require the installation of spring washers for loosening. The small end of the long bolt has a spherical structure and is equipped with a pin hole for insertion, preventing the hexagonal nut and spring washer connected to the long bolt from shaking and falling off during transportation.

[0047] The conical cover is made of wear-resistant soft cotton cloth. The color of the conical cover is consistent with the appearance of the coating on the extension section of the thin-walled nozzle. The conical cover is filled with sponge material and sewn in place. The conical cover has an opening along the generatrix direction, and Velcro is sewn at the opening. The width of the Velcro on the left and right staggered crimping part of the opening is not less than the preset range. The small end of the conical cover has two straps of the same length, which are used to wrap around the flange part of the extension section of the thin-walled nozzle for binding and preventing the conical cover from slipping.

[0048] After the rain cover is placed over the lid of the transport box, the base of the transport box and the lid are combined, and a rain cover or rainproof canvas is added to the outside of the box to prevent the transport box from getting wet during transportation. When the transport box is hoisted and transferred, the tilt angle of the box is less than the preset value. The universal rotating lifting ring on the base of the transport box is used for the turnover and transportation of the transport box. A moisture-proof box for storing moisture-proof sand is installed on the base of the transport box for moisture protection. At the same time, positioning blocks are installed and fixed to the base of the transport box by adhesive and nails.

[0049] The method of fixing and protecting using fixing and protective devices comprises the following steps:

[0050] Apply a heat-insulating coating to the inner surface, outer surface, and flange surface of the thin-walled nozzle extension section, and then place the coated thin-walled nozzle extension section on a parking rack for fixation and turnover.

[0051] A connecting device is installed on the flange of the thin-walled nozzle extension section. The connecting device and the thin-walled nozzle extension section are assembled into an integral structure and then reused.

[0052] After the heat insulation coating is applied, the thin-walled nozzle extension section and connecting device are hoisted onto the membrane, ensuring that the thin-walled nozzle extension section does not collide with the surrounding environment, and that the thin-walled nozzle extension section is placed vertically with the large end of the nozzle pointing downwards towards the ground.

[0053] The flange top of the thin-walled nozzle extension section is positioned axially and circumferentially by a limiting device.

[0054] A conical tarpaulin is installed on the outer surface of the thin-walled nozzle extension to cover and protect the heat insulation coating on the outer surface.

[0055] The thin-walled nozzle extension, covered by a conical tarpaulin, will be boxed for transport.

[0056] The following description, in conjunction with the accompanying drawings and preferred embodiments, provides further details:

[0057] In the current embodiment, the method for securing and protecting the transport of a large-size thin-walled nozzle extension includes the following steps:

[0058] (1) Apply heat insulation coating to the inner and outer surfaces of the thin-walled nozzle extension section and the flange surface, and place the coated thin-walled nozzle extension section on the parking rack for fixation and turnover.

[0059] (2) Assemble the flange of the thin-walled nozzle extension section with a connecting device, and then assemble the connecting device and the thin-walled nozzle extension section into a whole for turnover.

[0060] (3) Hoist the thin-walled nozzle extension section with coating and the connecting device onto the tire film to ensure that the extension section has sufficient support during transportation and avoids collision with objects; at the same time, place the extension section vertically with the large end of the nozzle pointing downwards towards the ground.

[0061] (4) Use a limiting device to position the top of the flange of the thin-walled nozzle extension section axially and circumferentially;

[0062] (5) Design a cone-shaped cover suitable for the product and install it on the outer surface of the extension section to cover and protect the heat insulation coating on the outer surface of the extension section.

[0063] (6) Assemble the transport box lid and the transport box base to form a sealed space.

[0064] The parking rack in step (1) mainly includes a support ring, a protective pad, a base, auxiliary blocks, bolts, nuts, and a universal rotating lifting ring. The support ring is a jig structure, and its surface fits a local surface near the small end of the extension section. Its material is 2A12, etc. The protective pad is a 5-10mm thick fine felt, which provides support for the thin-walled extension section on the one hand, and protects the coating of the extension section from being bumped or scratched on the other hand. The base is connected to the support ring by bolts and nuts. The auxiliary blocks fix and limit the large end of the extension section, and four are evenly distributed around the perimeter. When the extension section is rotated, the universal rotating lifting ring is used to rotate the extension section.

[0065] The connecting device in step (2) includes a cover plate assembly, a gasket assembly, bolts, nuts, and hooks. The cover plate assembly fits against the upper surface of the extension flange, ensuring that the bolt holes of the cover plate assembly are aligned with the flange holes; the gasket assembly fits against the lower surface of the extension flange, ensuring that the bolt holes of the gasket assembly are aligned with the flange holes. The cover plate assembly and the gasket assembly are connected by bolts and nuts, respectively protecting the coating on the upper and lower surfaces of the extension flange. Three to four hooks are used for lifting the connecting device and the nozzle extension.

[0066] The cover plate assembly includes a cover plate and a protective gasket I. The cover plate has four bolt holes, multiple extension flange connection holes, multiple weight-reduction holes, and four hook threaded holes. The four bolt holes on the cover plate are used for positioning. The flange connection holes are evenly distributed around the edge of the cover plate and can be evenly divided into multiple groups, each group having multiple bolt holes identical to those of the extension flange. The protective gasket I is made of polytetrafluoroethylene (PTFE) and has flange connection holes. It is fixed to the cover plate by adhesive and placed between the cover plate and the extension flange. The protective gasket I can be made of felt or F4 gasket, etc., to protect the upper surface of the extension flange.

[0067] The gasket assembly consists of 8 to 10 pieces, which should be evenly distributed around the edge of the extension flange during installation. The gasket assembly includes a sector plate and a protective gasket II. The sector plate is made of 2Al2 material, etc. The sector plate and the protective gasket II are fixed by adhesive bonding to protect the lower surface of the extension flange.

[0068] In step (3), the membrane is connected to the transport box support, and the material used is EVA aviation foam, etc.; the shape of the membrane matches the arc-shaped inner surface of the nozzle extension section. To prevent the nozzle extension section from sticking together after being placed on the membrane, the membrane needs to have 6 to 8 axial through grooves evenly distributed around its circumference, with a groove width of 150 to 180 mm and a depth of 40 to 60 mm; a circumferential through groove needs to be set in the middle of the membrane, with a groove width of 180 to 220 mm and a radial depth of 50 to 60 mm. The outer surface of the membrane needs to be fitted with a membrane sleeve that matches the coating color of the extension section, and the membrane sleeve fabric is made of pure cotton cloth.

[0069] In step (4), the limiting device includes a transport box bracket and a limiting component. The transport box bracket and the transport box base are assembled by welding, and the limiting component and the transport box bracket are assembled by spot welding or intermittent argon arc welding. After the extension section and the connecting device are placed behind the tire membrane, the connecting device and the limiting device are threaded together with long bolts and hexagonal nuts, so that the connecting device, the limiting component and the nozzle extension section can mutually restrain each other.

[0070] The limiting assembly includes a circular plate, long bolts, hexagonal nuts, washers, and pins. The circular plate has four through holes for the long bolts, corresponding one-to-one with the four long bolt holes on the cover plate, used to limit the axial and circumferential position of the nozzle extension section. The transport box bracket is fixed to the circular plate by argon arc welding. The large cylindrical end of the long bolt is fixed to the circular plate by argon arc welding; both the long bolt and the hexagonal nut require spring washers for loosening; the small end of the long bolt has a spherical structure and a small hole of Φ2mm~Φ5mm for a pin, preventing the hexagonal nut and washer connected to the long bolt from shaking and falling off during long-distance transportation.

[0071] The four long bolt holes on the circular plate are evenly distributed around the edge of the disc. For thin-walled nozzle extensions with larger flange diameters, the four long bolt holes on the cover plate are evenly distributed around the edge of the cover plate, reducing the labor intensity of the operator during assembly / disassembly, while ensuring the stability and reliability of the product during turnover and transportation. For thin-walled nozzle extensions with relatively smaller flange diameters, a through hole can be set in the center of the cover plate, and then the cover plate and the extension flange can be fixed by a large nut and the threaded part of the small end of the transport box bracket.

[0072] In step (5), the conical cover is made of wear-resistant soft cotton cloth. The color of the cover is consistent with the appearance of the coating of the extension section. The middle of the cover is filled with a soft sponge with a thickness of 3-5mm. The sponge needs to be sewn and fixed to avoid bulging. The conical cover is opened along its generatrix direction. The opening is sewn with Velcro. The width of the Velcro on the left and right sides of the opening is not less than 90mm. The small end of the conical cover is provided with two straps with a length of not less than 350mm, which are used to wrap around the product flange for binding to prevent the conical cover from slipping.

[0073] In step (6), after the transport box and the transport box cover are combined, a rainproof cover or rainproof canvas is added to the outside of the box to prevent the transport box from getting wet during transportation; when the transport box is hoisted or transferred, the tilt angle of the box should be less than 30°.

[0074] The transport box base is equipped with omnidirectional rotating lifting rings for handling and transporting the box. Four to six moisture-proof boxes for storing moisture-proof sand are also installed on the base. Four to six positioning blocks are installed on the base and secured to the bottom of the box using a combination of adhesive and nails.

[0075] The installation position of the positioning block is determined based on the actual fit between the lid and the bottom of the transport box. The edges of the positioning block are machined into chamfers of C40mm to C60mm, which serve as guides and positions when the lid and bottom of the transport box are connected. The positioning block can be used as an auxiliary step, with its height set as the height of the transport box - 1700mm (assuming a human height of 1700mm), for loading and unloading the long bolts, hexagonal nuts and spring washers of the limit assembly.

[0076] Example 1:

[0077] Taking the turnover and transportation of a large-size thin-walled nozzle extension as an example, this application provides a detailed description of the fixing and protection methods for the transportation of large-size thin-walled nozzle extensions.

[0078] A method for securing and protecting a large-size thin-walled nozzle extension section during transportation, specifically including the following steps:

[0079] Step 1: Apply a heat-insulating coating to the inner and outer surfaces and flange surface of a large-sized thin-walled nozzle extension section 2, and place the coated thin-walled nozzle extension section on a parking rack for fixation and turnover.

[0080] like Figure 1 As shown, the parking rack mainly includes a support ring 3, a protective pad 4, a base 7, an auxiliary stop block 8, a bolt 5, a nut 6, and a universal rotating lifting ring 9.

[0081] The support ring 3 is a tire structure, its surface conforming to a local surface near the small end of the extension section 2, and its material is 2A12, etc.; the protective pad 4 is a fine felt with a thickness of 5-10mm, protecting the coating of the extension section from bumps or scratches; the base 7 is connected to the support ring 3 by bolts 5 and nuts 6; the auxiliary stops 8 fix and limit the large end of the extension section, with 4-6 evenly distributed around the perimeter. When the large-size thin-walled nozzle extension section is rotated, a universal rotating lifting ring 9 is used for rotation.

[0082] Step 2: Assemble the large-size thin-walled nozzle extension flange 1 with the connecting device 11 of the transport box of the present invention into one unit.

[0083] like Figure 2 As shown, the connecting device 11 includes a cover plate assembly (19+23), a pad assembly (19-20), a bolt 21, a nut 22, and a hook 18.

[0084] like Figure 3 As shown, the cover plate assembly (19+23) fits against the upper surface of the extension flange 1, ensuring that the bolt holes of the cover plate assembly are aligned with the flange holes; the gasket assembly (19-20) fits against the lower surface of the extension flange 1, ensuring that the bolt holes of the gasket assembly are aligned with the flange holes. The cover plate assembly (19+23) and the gasket assembly (19-20) are connected by multiple bolts 21 and nuts 22, respectively protecting the coatings on the upper and lower surfaces of the extension flange 1. Three to four hooks 18 are used for lifting the connecting device 11 and the nozzle extension 2.

[0085] like Figure 4 As shown, the cover plate assembly includes a cover plate 23 and a protective gasket I19. The cover plate 23 has four bolt holes 24, eight to ten extension flange connection holes 27, five to eight weight-reducing holes 26, and four hook threaded holes 25. The four bolt holes 24 on the cover plate 23 are used for positioning. The flange connection holes 27 are evenly distributed around the edge of the cover plate and can be evenly divided into multiple groups, each group having multiple bolt holes 24 identical to those of the extension flange. The protective gasket I19 is made of polytetrafluoroethylene (PTFE) and has flange connection holes. It is fixed to the cover plate 23 by adhesive bonding and is placed between the cover plate 23 and the extension flange 1. The protective gasket I19 can be made of felt or F4 gasket, etc., to protect the upper surface of the extension flange 1.

[0086] The number of gasket assemblies (19-20) is 8 to 10, and they should be evenly distributed around the edge of the extension flange 1 during installation. The gasket assembly includes a sector plate 20 and a protective gasket II 21. The sector plate is made of 2Al2 or similar material. The sector plate 20 and the protective gasket II 21 are fixed by adhesive bonding to protect the lower surface of the extension flange 2.

[0087] Step 3: Hoist the large-size thin-walled nozzle extension flange 1 and the connecting device 11, and place them on the special membrane 13 of the transport box.

[0088] The membrane 13 is connected to the transport container support 14, and its material is selected from EVA aviation foam, etc.; the shape of the membrane 13 matches the arc-shaped inner surface of the nozzle extension section 2. Figure 6 As shown, the membrane 13 has 6-8 axial grooves 35 evenly distributed around its circumference, with a groove width of 150-180 mm and a depth of 40-60 mm, to prevent the nozzle extension section from sticking together after being placed on the membrane. A circumferential groove 36 needs to be provided in the middle of the membrane, with a groove width of 180-220 mm and a radial depth of 50-60 mm. A membrane sleeve 38, with the same color as the coating of the extension section, needs to be installed on the outer surface of the membrane. The membrane sleeve 38 is made of pure cotton fabric.

[0089] Step 4: Assemble and fix the connecting device 11 to the limiting component 10 of the transport box.

[0090] The limiting device includes a transport box bracket 14 and a limiting component 10. The transport box bracket 14 is assembled with the transport box base 7 by welding, and the limiting component 10 is assembled with the transport box bracket 14 by spot welding or intermittent argon arc welding. After the extension section 2 and the connecting device 11 are placed on the membrane 37, the connecting device 11 and the limiting device are threaded together by long bolts 30 and hexagonal nuts 29, so that the connecting device 11, the limiting component 10 and the nozzle extension section 2 can mutually restrain each other.

[0091] like Figure 5 As shown, the limiting assembly 10 includes a circular plate 31, a long bolt 30, a hexagonal nut 29, a spring washer 32, a pin 33, and a pin hole 34. The circular plate 31 has four long bolt through holes, corresponding one-to-one with the four long bolt holes on the cover plate 24, used to limit the axial and circumferential positions of the nozzle extension section 2. The transport box bracket 14 is fixed to the circular plate 31 by argon arc welding. The large cylindrical end of the long bolt 30 is fixed to the circular plate 31 by argon arc welding; both the long bolt 30 and the hexagonal nut 29 require the installation of spring washers 32 for loosening; the small end of the long bolt 30 has a spherical structure and is provided with a pin hole 34 of Φ2mm~Φ5mm for insertion, preventing the hexagonal nut 29 and spring washer 32 connected to the long bolt from shaking and falling off during long-distance transportation.

[0092] The four long bolt holes on the circular plate 31 are evenly distributed around the edge of the disc. For the thin-walled nozzle extension section 2 with a flange diameter greater than Φ500mm, the four long bolt holes on the cover plate 24 are evenly distributed around the edge of the cover plate, reducing the labor intensity of the operator in assembly / disassembly, while ensuring the stability and reliability of the product during turnover and transportation; for the thin-walled nozzle extension section with a flange diameter less than Φ500mm, a through hole can be set in the center of the cover plate 24, and then the cover plate 24 and the extension section flange 1 can be fixed by a large nut and the threaded part of the small end of the transport box bracket.

[0093] Step 5: Cover the outer surface of the large-sized thin-walled extension with a conical cover 39.

[0094] like Figure 7 As shown, the conical cover is made of wear-resistant soft cotton cloth, and the color of the cover is consistent with the appearance of the coating of the extension section. The middle of the cover is filled with 3-5mm thick soft sponge 40, which needs to be sewn to fix it to avoid bulging. The conical cover is open along its generatrix direction, and the opening is sewn with Velcro. The width of the Velcro on the left and right staggered crimping part of the opening is not less than 90mm. The small end of the conical cover has two straps 39 with a length of not less than 350mm, which are used to wrap around the product flange for binding to prevent the conical cover from slipping.

[0095] Step Six: Install the lid 12 of the transport box and cover it with the rain cover 44, as follows. Figure 9 As shown.

[0096] like Figure 3 As shown, after the transport box base 16 and transport box cover 12 are combined, a rainproof cover 12 or rainproof canvas is added to the outside of the box to prevent the transport box from getting wet during transportation; when the transport box is hoisted or transferred, the tilt angle of the box should be less than 30°.

[0097] A universal rotating lifting ring 9 is installed on the base 16 of the transport box for the turnover and transportation of the transport box; 4 to 6 moisture-proof boxes 17 for storing moisture-proof sand are installed on the base of the transport box for moisture protection. 4 to 6 positioning blocks 15 are installed on the base 16 of the transport box and are fixed to the base 16 of the transport box by means of glue and nails.

[0098] Based on the actual fit between the transport box cover 12 and the box bottom 16, the installation position of the positioning block 15 is determined. The edges of the positioning block 15 are machined into chamfers of C40mm to C60mm, which play a guiding and positioning role when the transport box cover 12 and the box bottom 16 are connected. The positioning block 15 can be used as an auxiliary step, and its height is set as: transport box height - 1700mm (assuming human height is 1700mm), for loading and unloading the long bolts 30, hexagonal nuts 29 and spring washers 32 of the limit assembly 10.

[0099] like Figure 8As shown, four connecting brackets 42 are set at corresponding positions on the transport box cover 12, and are threadedly connected to four connecting bolts 43 on the box bottom 16 through standard nuts, so as to realize the assembly and positioning of the transport box cover 12 and the box bottom 16.

[0100] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make possible variations and modifications to the technical solutions of the present invention using the disclosed methods and techniques without departing from the spirit and scope of the invention. Therefore, any simple modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention are not permitted.

[0101] Equivalent variations and modifications are all within the protection scope of the technical solution of this invention.

[0102] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A fixing and protection device for transporting a large-size thin-walled nozzle extension section, characterized in that: The system includes a support ring, protective pad, base, auxiliary stop, bolts, nuts, and a universal rotating lifting ring. The support ring is a jig-like structure, positioned on the outer side of the thin-walled nozzle extension section near the small end face, and conforms to the local profile of the small end of the thin-walled nozzle extension section. The protective pad is located below the support ring, providing support for the thin-walled nozzle extension section and protecting its coating from impacts or scratches. The base is connected to the support ring by bolts and nuts. The auxiliary stop is located on the axial outer side of the base, used to fix and limit the large end of the thin-walled nozzle extension section. The universal rotating lifting ring is located below the base, allowing the base to be rotated during the handling of the thin-walled nozzle extension section via the universal rotating lifting ring located at the bottom edge of the base.

2. The method for fixing and protecting a large-size thin-walled nozzle extension section during transportation according to claim 1, characterized in that: The flange portion of the thin-walled nozzle extension is integrally assembled and connected to the connecting device. The thin-walled nozzle extension is hoisted via the connecting device, which includes a cover plate assembly, a pad plate assembly, and a lifting hook, wherein: The cover plate assembly is fitted to the upper surface of the flange of the thin-walled nozzle extension section, and the bolt holes at the fitting position of the cover plate assembly are aligned with the flange holes on the upper surface of the flange; the gasket assembly corresponds to the cover plate assembly and is screwed to fix it, and is used to protect the spray coating on the upper and lower surfaces of the flange part of the thin-walled nozzle extension section.

3. The method for fixing and protecting a large-size thin-walled nozzle extension section during transportation according to claim 2, characterized in that: The cover plate assembly includes a cover plate and a first protective gasket. The cover plate is provided with bolt holes, extension section flange connection holes, weight reduction holes, and hook threaded holes. The first protective gasket is provided with flange connection holes. The cover plate and the first protective gasket are connected through the flange connection holes. The cover plate is connected to the flange holes on the upper surface of the flange of the thin-walled nozzle extension section through the bolt holes. The hook threaded holes are used to realize the lifting bolt connection of the cover plate. The weight reduction holes are used to realize the weight reduction of the cover plate assembly.

4. The method for fixing and protecting a large-size thin-walled nozzle extension section during transportation according to claim 3, characterized in that: The flange connection holes are evenly distributed on the edge of the cover plate. Each set of flange connection holes is set to be the same as the bolt hole specifications on the upper surface of the flange of the thin-walled nozzle extension section. The first protective gasket material is polytetrafluoroethylene and is connected to the cover plate by adhesive. The first protective gasket is set between the cover plate and the flange of the thin-walled nozzle extension section. The first protective gasket is used to protect the upper surface of the flange of the thin-walled nozzle extension section. During installation, the gasket assembly is evenly distributed around the flange edge of the thin-walled nozzle extension section. The gasket assembly includes a fan-shaped plate and a second protective gasket. The fan-shaped plate and the second protective gasket are fixed by adhesive bonding to protect the lower surface of the flange of the thin-walled nozzle extension section.

5. The method for fixing and protecting a large-size thin-walled nozzle extension section during transportation according to claim 2, characterized in that: The flange portion of the thin-walled nozzle extension section is an integral structure with the connecting device. After hoisting, it is placed in a special membrane in the transport box. The special membrane is connected to the support of the transport box. The material used is aviation foam. The shape of the special membrane is designed to match the arc-shaped inner surface of the thin-walled nozzle extension section. The special membrane has axial through grooves evenly distributed around its circumference to prevent the thin-walled nozzle extension section from sticking together after placement. A circumferential through groove is set in the middle of the special membrane. A membrane sleeve with the same color as the spray coating of the thin-walled nozzle extension section is installed on the outer surface of the special membrane. The membrane sleeve is made of pure cotton cloth.

6. The method for fixing and protecting a large-size thin-walled nozzle extension section during transportation according to claim 5, characterized in that: The connecting device is assembled and fixed with the limiting component of the transport box. The limiting device includes a transport box bracket and a limiting component. The transport box bracket and the transport box base are assembled by welding. The limiting component and the transport box bracket are assembled by spot welding or intermittent argon arc welding. The extension section and the connecting device are placed behind a special tire membrane. The connecting device and the limiting device are threaded together by long bolts and hexagonal nuts, so that the connecting device, the limiting component and the thin-walled nozzle extension section are mutually constrained.

7. The method for fixing and protecting a large-size thin-walled nozzle extension section during transportation according to claim 6, characterized in that: The limiting assembly includes a circular plate, long bolts, hexagonal nuts, spring washers, pins, and pin holes. The circular plate has four long bolt through holes, which correspond one-to-one with the four long bolt holes on the cover plate, used to limit the axial and circumferential positions of the thin-walled nozzle extension section. The transport box bracket is fixed to the circular plate by argon arc welding, and the large cylindrical end of the long bolt is fixed to the circular plate by argon arc welding. Both the long bolt and the hexagonal nut require the installation of spring washers for loosening. The small end of the long bolt has a spherical structure and is provided with a pin hole for insertion, preventing the hexagonal nut and spring washer connected to the long bolt from shaking and falling off during transportation.

8. The method for fixing and protecting a large-size thin-walled nozzle extension section during transportation according to claim 7, characterized in that: The conical cover is made of wear-resistant soft cotton cloth. The color of the conical cover is consistent with the appearance of the coating on the extension section of the thin-walled nozzle. The conical cover is filled with sponge material and sewn in place. The conical cover has an opening along the generatrix direction. Velcro is sewn at the opening. The width of the Velcro on the left and right staggered crimping part of the opening is not less than a preset range. The small end of the conical cover has two straps of the same length, which are used to wrap around the flange part of the extension section of the thin-walled nozzle for binding and preventing the conical cover from slipping.

9. The method for fixing and protecting a large-size thin-walled nozzle extension section during transportation according to claim 8, characterized in that: After the lid of the transport box is covered with a rainproof cover, the base of the transport box and the lid are combined, and a rainproof cover or rainproof canvas is added to the outside of the box to prevent the transport box from getting wet during transportation. When the transport box is hoisted and transferred, the tilt angle of the box is less than a preset value. The universal rotating lifting ring on the base of the transport box is used for the turnover and transportation of the transport box. A moisture-proof box for storing moisture-proof sand is installed on the base of the transport box for moisture protection. At the same time, a positioning block is installed, which is fixed to the base of the transport box by adhesive and nails.

10. A method for fixing and protecting a large-size thin-walled nozzle extension section transported using the fixing and protection device of claim 9, characterized in that... include: Apply a heat-insulating coating to the inner surface, outer surface, and flange surface of the thin-walled nozzle extension section, and then place the coated thin-walled nozzle extension section on a parking rack for fixation and turnover. A connecting device is installed on the flange of the thin-walled nozzle extension section. The connecting device and the thin-walled nozzle extension section are assembled into an integral structure and then reused. After the heat insulation coating is applied, the thin-walled nozzle extension section and connecting device are hoisted onto the membrane, ensuring that the thin-walled nozzle extension section does not collide with the surrounding environment, and that the thin-walled nozzle extension section is placed vertically with the large end of the nozzle pointing downwards towards the ground. The flange top of the thin-walled nozzle extension section is positioned axially and circumferentially by a limiting device. A conical tarpaulin is installed on the outer surface of the thin-walled nozzle extension to cover and protect the heat insulation coating on the outer surface. The thin-walled nozzle extension, covered by a conical tarpaulin, will be boxed for transport.

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