A combined box closing and detachable inner support and tightening device based on inclined surface force augmentation

Abstract

The present application belongs to the technical field of ring joint friction stir welding of launch vehicle tank box, and particularly relates to a combined box sealing detachable inner support tensioning device based on inclined plane force increase. The device comprises a lower lifting seat assembly, an upper support disc assembly and a personnel operation platform assembly. When the box is sealed and welded, the personnel operation platform assembly is assembled and fixed inside the box bottom. After the box sealing welding is completed, the upper support disc assembly is removed and moved to outside the box through the side manhole of the box bottom assembly, and the personnel operation platform assembly is removed and moved to outside the box. When the box bottom and the cylinder segment are butt jointed, the fork-shaped ring of the bowl-shaped box bottom and the adjacent cylinder segment lower edge are supported into a circle and sufficient support force is provided to ensure that no retreat occurs under the action of the strong upsetting force of the welding actuator, and reliable fixation of the two components to be welded is realized in cooperation with the external pressure clamp system, so that the tank does not move during the friction stir welding process, and the stable and reliable ring joint welding process of the tank is realized.

Description

Technical Field

[0001] This invention belongs to the field of friction stir welding technology for circumferential seams of launch vehicle propellant tanks, specifically relating to a combined detachable internal support and tightening device for sealing tanks based on inclined plane force enhancement. Background Technology

[0002] The circumferential seam friction stir welding of the 5m diameter propellant tank of the new generation manned launch vehicle adopts a vertical assembly welding scheme, which can eliminate the adverse effects of deformation of the propellant tank structure caused by gravity during horizontal assembly, reduce the difficulty of product assembly, and at the same time, use gravity to reduce the circumferential seam assembly gap, which is conducive to ensuring the shape and position dimensions and improving the circumferential seam assembly welding quality.

[0003] Product materials: 2219 aluminum alloy, 2195 aluminum-lithium alloy and other aerospace high-strength aluminum alloys.

[0004] Product features: This series of products features extra-long length, large thickness, and new structure. The longest tank is nearly 37m, and the maximum welding thickness is 20mm. The tank adopts a single-layer common bottom structure and a double-layer common bottom structure.

[0005] Product structure composition: The common bottom structure tank consists of four main parts: front bottom assembly, rear bottom assembly, common bottom structure assembly, and intermediate cylinder section. The main types of welds involved include: front bottom assembly / cylinder section butt joint circumferential weld, front tank cylinder section / cylinder section butt joint circumferential weld, front tank cylinder section / common bottom assembly butt joint circumferential weld, rear tank cylinder section / common bottom assembly bottom lock joint circumferential weld, rear tank cylinder section / cylinder section butt joint circumferential weld, and rear tank cylinder section / rear bottom assembly butt joint circumferential weld.

[0006] Product welding sequence: The vertical assembly welding of the storage tank body is planned to start from the rear bottom assembly and proceed sequentially to the front bottom assembly. No secondary assembly on the frame is required during the welding process. The common bottom assembly and the fuel tank section locking circumferential seam are fitted together on the frame in a vertical state. This mode can eliminate the need for sealing welding of the fuel tank. During the entire assembly and welding process of the storage tank, only the sealing welding of the circumferential seam of the front bottom assembly / section of the oxygen tank needs to be performed.

[0007] In the welding process of the vertical assembly scheme of large-diameter storage tanks, the tank body is fixed, and the welding actuator rotates around the tank body to complete the welding of the circumferential seam. For the front bottom assembly / cylinder section and the circumferential seam of the tank sealing, a set of detachable internal support and tightening device for sealing needs to be developed. The overall rigidity and internal support capacity of the detachable internal support and tightening device for sealing directly determine the welding quality of the last circumferential seam of the storage tank. Summary of the Invention

[0008] The purpose of this invention is to provide a combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement, in order to meet the above-mentioned requirements.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement includes a lower lifting seat assembly, an upper support plate assembly, and a personnel operating platform assembly. During the sealing welding, the personnel operating platform assembly is assembled and fixed inside the bottom of the box. After the sealing welding is completed, the upper support plate assembly is disassembled and moved outside the box through the manhole on the side of the bottom assembly, and the personnel operating platform assembly is disassembled and moved outside the box.

[0011] The lower lifting platform assembly includes a welded base, a lifting platform, support plate assembly connecting screws, a linear guide pair, a linear guide pair slider connecting screws, a screw jack positioning plate, screw jack connecting screws, a screw jack, a coupling, a servo motor mounting base, and a servo motor. The servo motor is connected to the side of the servo motor mounting base by screws, and the servo motor mounting base is connected to the side of the screw jack by screws. One end of the coupling is sleeved on the output shaft of the servo motor, and the other end is sleeved on the input shaft of the screw jack. The screw jack is fixed to the screw jack positioning plate by screw jack connecting screws. At the bottom, the positioning plate of the screw jack is reliably fixed to the bottom of the welded base with screws; the welded base is a hollow cylindrical structure, and the lifting seat is arranged inside the welded base. The top of the screw jack is fixed to the bottom of the lifting seat with screws. A linear guide rail pair is arranged on the left and right sides of the lifting seat. The slider is fixed to the inner surface of the welded base by the slider connecting screw of the linear guide rail pair; the screw jack pushes the lifting seat to move up and down along the linear guide rail pair inside the welded base; the upper end face of the lifting seat is a conical hole structure, and its upper end face is fixed to the upper support plate assembly by the support plate assembly connecting screw.

[0012] The upper support plate assembly includes an outer support block unit, a wedge-tightening support block unit, a horizontal support rod unit, an inclined support rod unit, and a central fixed seat. The central fixed seat fixes the entire upper support plate assembly to the upper end face of the lifting seat through tapered hole positioning and bolt connection. The outer support block unit and the wedge-tightening support block unit are arranged at intervals, and the wedge-tightening support block unit contacts the outer support block unit in an inclined form. The tension screw of the wedge-tightening support block unit is screwed into the wire thread sleeve of the outer support block unit. The first rotating handle of the wedge-tightening support block unit presses against the wedge-tightening support block. The outer support block support rod of the outer support block unit is connected to the first left and right screws of the horizontal support rod unit and to the upper support rod of the inclined support rod unit through upper support rod connecting bolts. The lower support rod of the inclined support rod unit is fixedly connected to the support seat of the central fixed seat through support seat screws. The rotating block of the wedge-tightening support block unit is sleeved on the annular support rod of the horizontal support rod unit, so that the wedge-tightening support block unit has the function of rotating around the center of the annular support rod. The horizontal support rod of the horizontal support rod unit is screwed to the central welding seat of the central fixed seat.

[0013] The outer support block unit consists of an outer support block head pad, an outer support block, a positioning cone pin, an outer support block connecting bolt, an outer support block support rod, an outer support block head pad connecting screw, an outer support block support rod connecting bolt, and wire thread sleeves. The two outer support blocks of the outer support block unit are hinged and quickly positioned by the positioning cone pin. They are connected into a whole by the outer support block connecting bolt and have a fan-shaped symmetrical structure. U-shaped positioning grooves are opened on both sides to cooperate with the guide positioning pins of the wedge-tightening support block unit. Two wire thread sleeves are embedded at each end of the tail for connecting the tightening screws of the wedge-tightening support block unit. The outer support block head pad of the outer support block unit is connected to the head of the outer support block by the outer support block head pad connecting screw, and the outer support block support rod is connected to the tail of the outer support block by the outer support block support rod connecting bolt.

[0014] The wedge-tightening support block unit consists of a wedge-tightening support block head pad, a wedge-tightening support block head pad connecting screw, a wedge-tightening support block, a tensioning screw, a first left screw connecting bolt, a first left screw, left and right threaded sleeves, a first rotating handle, a first right screw, a rotating block, a fastening screw, an ejector screw, side pads, guide positioning pins, and side pad connecting screws. The wedge-tightening support block of the wedge-tightening support block unit has a wedge-shaped symmetrical structure. The side pads on the left and right sides are connected by side pad connecting screws. Two guide positioning pins are arranged on each side, forming a mating relationship with the U-shaped positioning grooves on the side of the outer support block. The wedge-tightening support block head pad of the wedge-tightening support block unit is connected to the head of the wedge-tightening support block by a wedge-tightening support block head pad connecting screw; the first left screw is connected to the tail of the wedge-tightening support block by a first left screw connecting bolt; the first left screw and the first right screw are connected by left and right threaded sleeves, the first rotating handle passes vertically through the center of the left and right threaded sleeves, and the rear shaft diameter of the first right screw is fitted into the positioning hole of the rotating block and connected by a fastening screw; the rotating block of the wedge-tightening support block unit has a T-shaped structure, which is fitted on the annular support rod of the horizontal support rod unit and can rotate around the annular support rod.

[0015] The horizontal support rod unit consists of horizontal support rods, annular support rods, annular support rod connecting bolts, a second rotating handle, and first left and right screw rods. The horizontal support rod unit has 12 sets of horizontal support rods, one end of which is threaded to a central fixed seat, and the other end is threaded to the first left and right screw rods. The second rotating handle passes vertically through the center of the first left and right screw rods. Annular support rods are arranged between the horizontal support rods and reliably connected as a whole by the annular support rod connecting bolts. The front end of the first left and right screw rods is threaded to the outer support block support rod of the outer support block unit.

[0016] The inclined support rod unit consists of a lower support rod, an upper support rod, a lower support rod connecting bolt, a second left and right screw rod, a third rotating handle, and an upper support rod connecting bolt. The lower end of the lower support rod is hinged to the support base of the central fixed seat through the lower support rod connecting bolt. The lower support rod and the upper support rod are connected through the second left and right screw rod. The upper end of the upper support rod is hinged to the outer support block support rod of the outer support block unit through the upper support rod connecting bolt. The third rotating handle passes vertically through the center of the second left and right screw rod.

[0017] The central fixed seat consists of a rotating lifting ring, a central welded seat, a support seat, and support seat connecting screws. The central welded seat of the central fixed seat is a welded component with a tapered shaft structure at its bottom, which mates with the tapered hole of the lower lifting seat assembly. The central fixed seat is fixed to the lifting seat by the connecting screws of the support plate assembly. Several sets of support seats are evenly distributed at the lower end of the central welded seat, which are fixed by the support seat connecting screws and hinged to the lower support rod of the inclined support rod unit. Several sets of threaded holes are evenly distributed at the upper end of the central welded seat, which are screwed to the threaded shaft of the horizontal support rod of the horizontal support rod unit. The rotating lifting ring is installed on the upper surface of the central welded seat.

[0018] The personnel operation platform consists of 10 folding stools, 10 support rods, 10 outer ring pedals, and 10 inner ring pedals.

[0019] The folding stool consists of an upper panel, diagonal support legs, a first hinge seat, a first connecting pin, a vertical support leg, a second hinge seat, a second connecting pin, a first hinge seat connecting screw, and a second hinge seat connecting screw. The upper panel has flanges on both sides for mounting outer and inner ring-shaped pedals. The first hinge seat is fixed to the upper panel via first hinge seat connecting screws. The second hinge seat is also fixed to the upper panel via second hinge seat connecting screws. One end of the diagonal support leg is connected to the first hinge seat via the first connecting pin, and one end of the vertical support leg is connected to the second hinge seat via the second connecting pin. The diagonal support leg has two sets of positioning pin holes, used for positioning the stool when unfolded and when folded, respectively, allowing the folding stool to be easily removed from the side manhole of the bottom assembly after folding. One end of the support rod abuts against the welded base, and the other end abuts against the folding stool to prevent it from sliding backward. An outer ring-shaped pedal and an inner ring-shaped pedal are installed between the two folding stools, with two through holes on the ring-shaped pedals.

[0020] The beneficial effects achieved by this invention are as follows:

[0021] The circumferential seam friction stir welding of the new-generation manned launch vehicle's 5m diameter propellant tank adopts a vertical assembly welding scheme, which significantly improves product quality and production efficiency. The welding principle of the vertical assembly of the propellant tank's circumferential seam is as follows: during the welding process, the tank body is fixed, and the welding actuator rotates around the tank body to complete the circumferential seam welding. The function of the detachable internal support and clamping device is to support the forked ring of the bowl-shaped tank bottom and the lower edge of the adjacent cylinder section into a circular shape and provide sufficient support force when welding the circumferential seam of the tank bottom and cylinder section. This ensures that it does not slip under the strong forging force of the welding actuator, and works in conjunction with the external pressure clamping system to reliably fix the two components to be welded, ensuring that the tank body does not move during the friction stir welding process, thus achieving a stable and reliable circumferential seam welding process. After welding, the internal support and clamping device can be retracted, and after manual disassembly, the tank can be transported out through the manhole flange on the bottom of the tank. Attached Figure Description

[0022] Figure 1 Figure A shows the composition of a combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement;

[0023] Figure 2 Figure B shows the composition of a combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement;

[0024] Figure 3 This is a diagram showing the components of the lower-level lifting platform assembly.

[0025] Figure 4 A isometric view A of the upper support plate assembly;

[0026] Figure 5 Axonometric view B of the upper support plate assembly;

[0027] Figure 6 Figure A shows the composition of the external support block unit.

[0028] Figure 7 Figure B shows the composition of the external support block unit;

[0029] Figure 8 Figure A shows the composition of the wedge-support block unit;

[0030] Figure 9 Figure B shows the composition of the wedge-support block unit;

[0031] Figure 10 This is a diagram showing the composition of a horizontal support rod unit.

[0032] Figure 11 This is a diagram showing the composition of a diagonal support rod unit.

[0033] Figure 12 Diagram of the central fixing base;

[0034] Figure 13 Figure A shows the components of the personnel operation platform.

[0035] Figure 14 Figure B shows the components of the personnel operation platform.

[0036] Figure 15 Two state diagrams for the folding stool of the personnel operation platform component;

[0037] In the diagram: Lower lifting seat assembly 1, Upper support plate assembly 2, Personnel operating platform assembly 3, Welded base 4, Lifting seat 5, Support plate assembly connecting screw 6, Linear guide pair 7, Linear guide pair slider connecting screw 8, Screw jack positioning plate 9, Screw jack connecting screw 10, Screw jack 11, Coupling 12, Servo motor mounting base 13, Servo motor 14, Outer support block unit 15, Wedge-tightening support block unit 16, Horizontal support rod unit 17, Diagonal support rod unit 18, Center fixed seat 19, Outer support block head pad 20, Outer support block 21, Positioning cone pin 22, Outer support block connecting bolt 23, Outer support block support rod 24, Outer support block head pad connecting screw 25, Outer support block support rod connecting bolt 26, Wire thread sleeve 27, Wedge-tightening support block head pad 28, Wedge-tightening support block head pad connecting screw 29, Wedge-tightening support block 30, Tensioning screw 31, First left screw connecting bolt 32, First left screw 33, Left and right Threaded sleeve 34, first rotating handle 35, first right screw 36, rotating block 37, fastening screw 38, ejector screw 39, side pad 40, guide positioning pin 41, side pad connecting screw 42, horizontal support rod 43, annular support rod 44, annular support rod connecting bolt 45, second rotating handle 46, first left and right screws 47, lower support rod 48, upper support rod 49, lower support rod connecting bolt 50, second left and right screws 51, third rotating handle 52, upper support rod connecting bolt 53, rotating lifting ring 54, center welding seat 55, support seat 56, support seat connecting screw 57, folding stool 58, inner annular pedal 59, support rod 60, outer annular pedal 61, upper panel 62, inclined support leg 63, first hinge seat 64, first connecting tapered pin 65, vertical support leg 66, second hinge seat 67, second connecting tapered pin 68, first hinge seat connecting screw 69, second hinge seat connecting screw 70. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0039] A modular, detachable internal support and tightening device for sealing tanks based on inclined plane force enhancement is proposed. It uses several sets of outer fan-shaped support blocks and several sets of inner wedge-tightening support blocks to form a complete inner support ring, which is combined with the back support rod system to achieve internal tightening of the sealing ring seam of the storage tank. The expansion and tightening effect of the inner wedge-tightening support blocks generates huge radial and axial internal stresses in the entire inner support ring, thereby resisting the upsetting force during friction stir welding. All support block assemblies and support rod assemblies can be disassembled and moved out of the tank through the manhole (500mm in diameter) of the tank bottom assembly. The central basic mandrel assembly can be pulled out through the central hole (500mm in diameter) of the tank bottom assembly.

[0040] The modular detachable internal support and tensioning device for sealing containers includes a lower lifting seat assembly 1, an upper support plate assembly 2, and a personnel operating platform assembly 3. It is mainly used for internal support during the welding of the circumferential seam of the storage container.

[0041] The lower lifting platform assembly 1 includes a welded base 4, a lifting platform 5, a support plate assembly connecting screw 6, a linear guide pair 7, a linear guide pair slider connecting screw 8, a screw jack positioning plate 9, a screw jack connecting screw 10, a screw jack 11, a coupling 12, a servo motor mounting base 13, and a servo motor 14. The servo motor 14 is connected to the side of the servo motor mounting base 13 by screws, and the servo motor mounting base 13 is connected to the side of the screw jack 11 by screws. One end of the coupling 12 is sleeved on the output shaft of the servo motor 14, and the other end is sleeved on the input shaft of the screw jack 11. The screw jack 11 is fixed to the bottom of the screw jack positioning plate 9 by the screw jack connecting screw 10, and the screw jack positioning plate 9 is reliably fixed to the bottom of the welded base 4 by screws. The welding base 4 is a hollow cylindrical structure. The lifting seat 5 is arranged inside the welding base 4. The top of the screw jack 11 is fixedly connected to the bottom of the lifting seat 5 with screws. A linear guide rail pair 7 is arranged on each of the left and right sides of the lifting seat 5. The slider is fixed to the inner surface of the welding base 4 by the slider connecting screw 8 of the linear guide rail pair. The screw jack 11 pushes the lifting seat 5 to move up and down along the linear guide rail pair 7 inside the welding base 4. The upper end face of the lifting seat 5 is a conical hole structure. Its upper end face is fixedly connected to the upper support plate assembly 2 by the support plate assembly connecting screw 6. After the sealing circumferential weld is completed, the main body of the upper support plate assembly 2 can retract to avoid the grid inside the cylindrical section, and has the ability to rise by 300mm as a whole, which facilitates weld grinding and phased array detection. When repair welding is required, the sealing and support state can be quickly restored.

[0042] The upper support plate assembly 2 includes an outer support block unit 15, a wedge-tightening support block unit 16, a horizontal support rod unit 17, an inclined support rod unit 18, and a central fixing seat 19. The central fixing seat 19 fixes the entire upper support plate assembly 2 to the upper end face of the lifting seat 5 through tapered hole positioning and bolt connection, providing a lifting function with a stroke of 300mm. The outer support block unit 15 and the wedge-tightening support block unit 16 are arranged at intervals, and the wedge-tightening support block unit 16 contacts the outer support block unit 15 in an inclined form. Based on the static splitting principle, the tensioning screw 31 of the wedge-tightening support block unit 16 is screwed into the wire thread sleeve 27 of the outer support block unit 15, and the first rotating handle 35 of the wedge-tightening support block unit 16 presses against the wedge-tightening support block 30, ensuring double reliable internal support. The outer support block support rod 24 of the outer support block unit 15 is connected to the first left and right screws 47 of the horizontal support rod unit 17 and to the upper support rod 49 of the inclined support rod unit 18 through the upper support rod connecting bolt 53. The lower support rod 48 of the inclined support rod unit 18 is fixedly connected to the support seat 56 of the central fixed seat 19 through the support seat screw 57. The rotating block 37 of the wedge-tightening support block unit 16 is sleeved on the annular support rod 43 of the horizontal support rod unit 17, so that the wedge-tightening support block unit 16 has the function of rotating around the center of the annular support rod 43. The horizontal support rod 43 of the horizontal support rod unit 17 is screwed onto the central welding seat 55 of the central fixed seat 19.

[0043] The outer support block unit 15 consists of an outer support block head pad 20, an outer support block 21, a positioning cone pin 22, an outer support block connecting bolt 23, an outer support block support rod 24, an outer support block head pad connecting screw 25, an outer support block support rod connecting bolt 26, and a wire thread sleeve 27. The two outer support blocks 21 of the outer support block unit 15 are hinged and quickly positioned by the positioning cone pin 22. They are connected as a whole by the outer support block connecting bolt 23 and have a fan-shaped symmetrical structure. U-shaped positioning grooves are opened on both sides to cooperate with the guide positioning pin 41 of the wedge-tightening support block unit 16. Two wire thread sleeves 27 are inlaid at each end of the tail for connecting the tightening screw 31 of the wedge-tightening support block unit 16. The outer support block head pad 20 of the outer support block unit 15 is connected to the head of the outer support block 21 by the outer support block head pad connecting screw 25, and the outer support block support rod 24 is connected to the tail of the outer support block 21 by the outer support block support rod connecting bolt 26.

[0044] The wedge-tightening support block unit 16 consists of a wedge-tightening support block head pad 28, a wedge-tightening support block head pad connecting screw 29, a wedge-tightening support block 30, a tension screw 31, a first left screw connecting bolt 32, a first left screw 33, left and right threaded sleeves 34, a first rotating handle 35, a first right screw 36, a rotating block 37, a fastening screw 38, an ejector screw 39, a side pad 40, a guide positioning pin 41, and a side pad connecting screw 42. The wedge-tightening support block 30 of the wedge-tightening support block unit 16 has a wedge-shaped symmetrical structure. The side pads 40 on the left and right sides are connected by side pad connecting screws 42. Two guide positioning pins 41 are arranged on each side, forming a mating relationship with the U-shaped positioning groove on the side of the outer support block 21. The wedge-tightening support block head pad 28 of the wedge-tightening support block unit 16 is connected to the head of the wedge-tightening support block 30 via a wedge-tightening support block head pad connecting screw 29; the first left screw 33 is connected to the tail of the wedge-tightening support block 30 via a first left screw connecting bolt 32; the first left screw 33 and the first right screw 36 are connected via left and right threaded sleeves 34, and the first rotating handle 35 passes vertically through the center of the left and right threaded sleeves 34; the rear end shaft of the first right screw 36 is fitted into the positioning hole of the rotating block 37 and connected with a fastening screw 38. The rotating block 37 of the wedge-tightening support block unit 16 has a T-shaped structure and is fitted onto the annular support rod 44 of the horizontal support rod unit 17, allowing it to rotate around the annular support rod 44.

[0045] The horizontal support rod unit 17 consists of horizontal support rods 43, annular support rods 44, annular support rod connecting bolts 45, a second rotating handle 46, and first left and right screws 47. The horizontal support rods 43 of the horizontal support rod unit 17 have 12 sets, with one end threaded onto the central fixing seat 19 and the other end threaded into the first left and right screws 47. The second rotating handle 46 passes vertically through the center of the first left and right screws 47. Annular support rods 44 are arranged between the horizontal support rods 43 and reliably connected as a whole by the annular support rod connecting bolts 45. The front end of the first left and right screws 47 is screwed onto the outer support block support rod 24 of the outer support block unit 15.

[0046] The inclined support rod unit 18 consists of a lower support rod 48, an upper support rod 49, a lower support rod connecting bolt 50, a second left and right screw rod 51, a third rotating handle 52, and an upper support rod connecting bolt 53. The lower end of the lower support rod 48 is hinged to the support base 56 of the central fixed base 19 via the lower support rod connecting bolt 50. The lower support rod 48 and the upper support rod 49 are connected via the second left and right screw rod 51. The upper end of the upper support rod 49 is hinged to the outer support block support rod 24 of the outer support block unit 15 via the upper support rod connecting bolt 53. The third rotating handle 52 passes vertically through the center of the second left and right screw rod 51.

[0047] The central fixed seat 19 consists of a rotating lifting ring 54, a central welding seat 55, a support seat 56, and a support seat connecting screw 57. The central welding seat 55 of the central fixed seat 19 is a welded part with a tapered shaft structure at its bottom, which is matched with the tapered hole of the lifting seat 5 of the lower lifting seat assembly 1. The central fixed seat 19 is fixed to the lifting seat 5 by the support plate assembly connecting screw 6. Several sets of support seats 56 are evenly distributed at the lower end of the central welding seat 55, which are fixed by the support seat connecting screw 57 and hinged to the lower support rod 48 of the inclined support rod unit 18. Several sets of threaded holes are evenly distributed at the upper end of the central welding seat 55, which are screwed to the threaded shaft of the horizontal support rod 43 of the horizontal support rod unit 17. The rotating lifting ring 54 is installed on the upper surface of the central welding seat 55 and is used for lifting the entire upper support plate assembly 2.

[0048] Given that the theoretical inner diameter of the welding area of ​​the cylindrical section and the bottom assembly is Ф4992mm, when performing circumferential welding for sealing the box, for example, if the diameter range of the cylindrical section is [Ф4990,Ф4994], and the diameter range of the cylindrical section after being expanded is [Ф4991,Ф4995], then the theoretical design diameter of the support block of the upper support plate assembly is Ф4993mm. By designing three specifications of wedge-tightening support blocks, namely small support blocks, standard support blocks and large support blocks, the internal support requirements of different diameters can be met. The single-sided increment of the wedge-tightening blocks (small blocks, standard blocks, and large blocks) is approximately 0.5 mm. A series of theoretical diameters [Ф4991, Ф4991.32, Ф4991.64, Ф4991.95, ..., Ф4994.68, Ф4995] are obtained through the arrangement and combination of the blocks. After the lower end of the cylinder section is milled, the inner diameter of the cylinder section is measured first, and then the matching inner support diameter is selected to determine the optimal combination of the wedge-tightening blocks.

[0049] The lower lifting seat assembly is fixed in place, while the upper support plate assembly is pre-assembled into a whole on the platform outside the frame. After the bottom assembly is installed on the bottom loading mechanism, the upper support plate assembly is hoisted onto the lower lifting seat assembly. The upper support plate assembly is quickly positioned through the tapered shaft hole, making the operation simple and reliable. It also ensures that the center of the support block is basically aligned with the longitudinal seam of the section to be welded inside the frame, guaranteeing the best assembly effect. Only the support action is performed inside the box.

[0050] After the sealing circumferential seam is welded, the upper support plate assembly can retract to avoid the grid inside the cylinder section, enabling an overall height increase of 300mm. This facilitates weld grinding and phased array testing. If additional welding is needed, the sealing and support structure can be quickly restored. After the phased array test is passed, the upper support plate assembly, except for the central fixed seat, is completely removed from the tank, thus completing the welding of the entire storage tank.

[0051] The outer support block assembly and the wedge-tightening support block assembly of the upper support plate are equipped with horizontal and diagonal support rods on their backs to prevent the pads of the two support blocks from deforming and retracting under the welding upsetting force. Each component of the detachable inner support has sufficient rigidity and impact resistance, and exhibits high reliability under impact, compression, and pulling forces during assembly and use.

[0052] The upper support plate assembly is a combined rod system support structure, which is designed to prevent tipping, twisting, bending deformation, and collapse. The support force is large enough. After assembly, for products with a thickness of 20mm, it can ensure that the product diameter is not less than 1mm larger than the diameter in its natural state. Under the condition of welding upsetting force, the inner support retraction distance is not greater than 0.4mm.

[0053] The upper support plate assembly has sufficient rigidity and reliability, does not back out during welding, is easy to assemble and disassemble, and the dimensions of the parts are easy to transport to the outside of the tank through the manhole flange, while maintaining a sufficient safe distance from the manhole flange. The screws of the detachable inner support are marked with scales, making it easy for operators to judge the support distance.

[0054] The personnel operating platform component 3 consists of 10 folding stools 58, 10 support rods 60, 10 outer ring pedals 61, and 10 inner ring pedals 59. During the sealing and welding process, the bottom assembly is first installed on the high-end frame outside the frame. Then, in the open state, the personnel operating platform component 3 is assembled and fixed inside the bottom of the box. After the sealing and welding are completed, the upper support plate component 2 is moved outside the box through the manhole on the side of the bottom assembly. The personnel operating platform component 3 is then easily disassembled and moved outside the box. The personnel operating platform is connected as a single structure, ensuring excellent rigid support and allowing at least four people (average weight 85kg each) to work inside the box simultaneously.

[0055] The folding stool 58 consists of an upper panel 62, diagonal support legs 63, a first hinge seat 64, a first connecting taper pin 65, a vertical support leg 66, a second hinge seat 67, a second connecting taper pin 68, a first hinge seat connecting screw 69, and a second hinge seat connecting screw 70. The upper panel 62 has flanges on both sides for laying the outer annular footrest 61 and the inner annular footrest 59. The first hinge seat 64 is fixed to the upper panel 62 by the first hinge seat connecting screw 69. The second hinge seat 67 is fixed to the upper panel 62 by the second hinge seat connecting screw 70. One end of the diagonal support leg 63 is connected to the first hinge seat 64 by the first connecting taper pin 65, and one end of the vertical support leg 66 is connected to the second hinge seat 67 by the second connecting taper pin 68. The diagonal support leg 63 is designed with two sets of positioning pin holes, used for positioning and connection after the stool is unfolded and folded, respectively. After folding, the stool can be easily removed from the side manhole of the bottom assembly. One end of the support rod 60 rests against the welded base 4, and the other end rests against the folding stool 58. Its main function is to prevent the folding stool 58 from moving backward. An outer ring foot pedal 61 and an inner ring foot pedal 59 are laid between the two folding stools. The ring foot pedals have two through holes to facilitate workers' handling and operation. The maximum weight of a single foot pedal does not exceed 10 kg.

[0056] The main technical specifications of a combined detachable internal support and tightening device for sealing boxes based on inclined plane force enhancement are as follows: It adopts a manual tightening method, ensuring internal tightening through the wedging action of the wedge-tightening blocks, which can meet the internal tightening requirements of the bottom assembly of a 5m diameter box and the sealing ring seam of the cylindrical section; the device's external dimensions are approximately: 5000mm outer diameter × 2300mm height; the weight of a single support block and support rod does not exceed 20kg, and it can pass through a Φ500mm manhole; the upper support plate assembly of the device has a lifting capacity of 300mm; the support block assembly has good adaptability and can meet the internal tightening requirements of products with an inner diameter of Φ4991~Φ4994mm.

[0057] The 5m diameter box bottom assembly and the sealing circumferential seam of the cylindrical section are internally tightened using a manual clamping method. The support block assembly has good adaptability and can meet the internal clamping requirements of products with an inner diameter of Φ4991~Φ4994mm. The wedge-tightening of the support blocks, achieved through inclined force amplification, ensures reliable locking of all support blocks, with the support rod system providing support. The upper support plate assembly can be hoisted as a whole to the lower lifting platform, possessing radial retraction and lifting functions to meet the needs of weld inspection and repair welding. The personnel operating platform consists of folding stools and is supported by a rod system for positioning, ensuring good platform stability.

[0058] A modular, detachable internal support and clamping device for sealing and welding, based on inclined plane force amplification, is invented. It employs a combination of 12 sets of hinged composite support blocks and 12 sets of wedge-type support blocks to clamp the product. All support blocks are pre-assembled via a central mandrel and rod system. The wedge-type support blocks are clamped by force amplification through wedge-shaped inclined surfaces, with arc length matching to expand and tighten the welded area within the product. This detachable internal support and clamping device for sealing and welding features a micro-adjustment function to accommodate product diameter variations of up to 4mm. Three sizes of wedge-type support blocks—small, standard, and large—are designed to meet the internal support requirements for different diameters. The device also features radial retraction and overall lifting functions, facilitating worker disassembly, reassembly, welding repair, and repositioning.

[0059] The combined detachable internal support clamping device for sealing the tank based on inclined plane force enhancement is a key component of the vertical assembly and welding system of the 5m diameter tank. The device has the following dimensions: outer diameter × height = Φ5000mm × 2300mm. It will be applied to the friction stir welding system of the circumferential seam of the 5m diameter tank of the new generation manned launch vehicle, providing a new method and idea for the circumferential seam welding of the tank in the vertical state.

Claims

1. A combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement, characterized in that: The assembly includes a lower lifting seat assembly, an upper support plate assembly, and a personnel operating platform assembly. The personnel operating platform assembly is located between the lower lifting seat assembly and the upper support plate assembly. During the sealing welding process, the personnel operating platform assembly is assembled and fixed inside the bottom of the enclosure. After the sealing welding is completed, the upper support plate assembly is disassembled and moved outside the enclosure through the side manhole of the bottom assembly. The personnel operating platform assembly is also disassembled and moved outside the enclosure. The lower lifting seat assembly includes a welded base, a lifting seat, support plate assembly connecting screws, a linear guide pair, linear guide pair slider connecting screws, a screw jack positioning plate, screw jack connecting screws, a screw jack, a coupling, a servo motor mounting base, and a servo motor. The motor is connected to the side of the servo motor mounting base by screws. The servo motor mounting base is connected to the side of the screw jack by screws. One end of the coupling is sleeved on the output shaft of the servo motor, and the other end is sleeved on the input shaft of the screw jack. The screw jack is fixed to the bottom of the screw jack positioning plate by screws. The screw jack positioning plate is reliably fixed to the bottom of the welded base by screws. The welded base is a hollow cylindrical structure, and the lifting seat is arranged inside the welded base. The top of the screw jack is fixed to the bottom of the lifting seat by screws. A linear guide pair is arranged on each of the left and right sides of the lifting seat. The slider connecting screws fix the slider to the inner surface of the welding base; the screw jack pushes the lifting seat to move up and down along the linear guide pair inside the welding base; the upper end face of the lifting seat has a conical hole structure, and its upper end face is fixedly connected to the upper support plate assembly by the support plate assembly connecting screws; the upper support plate assembly includes an outer support block unit, a wedge-tightening support block unit, a horizontal support rod unit, an inclined support rod unit, and a central fixing seat; the central fixing seat fixes the entire upper support plate assembly to the upper end face of the lifting seat through conical hole positioning and bolt connection; the outer support block unit and the wedge-tightening support block unit are arranged at intervals, and the wedge-tightening support block unit contacts the outer support block unit in an inclined form. The tensioning screw of the block unit is screwed into the wire thread sleeve of the outer support block unit. The first rotating handle of the wedge-tightening support block unit is pressed against the wedge-tightening support block. The outer support block support rod of the outer support block unit is connected to the first left and right screws of the horizontal support rod unit and to the upper support rod of the inclined support rod unit through the upper support rod connecting bolt. The lower support rod of the inclined support rod unit is fixedly connected to the support seat of the central fixed seat through the support seat screw. The rotating block of the wedge-tightening support block unit is sleeved on the annular support rod of the horizontal support rod unit, so that the wedge-tightening support block unit has the function of rotating around the center of the annular support rod. The horizontal support rod of the horizontal support rod unit is screwed onto the central welding seat of the central fixed seat.

2. The combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement according to claim 1, characterized in that: The outer support block unit consists of an outer support block head pad, an outer support block, a positioning cone pin, an outer support block connecting bolt, an outer support block support rod, an outer support block head pad connecting screw, an outer support block support rod connecting bolt, and wire thread sleeves. The two outer support blocks of the outer support block unit are hinged and quickly positioned by the positioning cone pin. They are connected into a whole by the outer support block connecting bolt and have a fan-shaped symmetrical structure. U-shaped positioning grooves are opened on both sides to cooperate with the guide positioning pins of the wedge-tightening support block unit. Two wire thread sleeves are embedded at each end of the tail for connecting the tightening screws of the wedge-tightening support block unit. The outer support block head pad of the outer support block unit is connected to the head of the outer support block by the outer support block head pad connecting screw, and the outer support block support rod is connected to the tail of the outer support block by the outer support block support rod connecting bolt.

3. The combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement according to claim 2, characterized in that: The wedge-tightening support block unit consists of a wedge-tightening support block head pad, a wedge-tightening support block head pad connecting screw, a wedge-tightening support block, a tensioning screw, a first left screw connecting bolt, a first left screw, left and right threaded sleeves, a first rotating handle, a first right screw, a rotating block, a fastening screw, an ejector screw, side pads, guide positioning pins, and side pad connecting screws. The wedge-tightening support block of the wedge-tightening support block unit has a wedge-shaped symmetrical structure. The side pads on the left and right sides are connected by side pad connecting screws. Two guide positioning pins are arranged on each side, forming a mating relationship with the U-shaped positioning grooves on the side of the outer support block. The wedge-tightening support block head pad of the wedge-tightening support block unit is connected to the head of the wedge-tightening support block by a wedge-tightening support block head pad connecting screw; the first left screw is connected to the tail of the wedge-tightening support block by a first left screw connecting bolt; the first left screw and the first right screw are connected by left and right threaded sleeves, the first rotating handle passes vertically through the center of the left and right threaded sleeves, and the rear shaft diameter of the first right screw is fitted into the positioning hole of the rotating block and connected by a fastening screw; the rotating block of the wedge-tightening support block unit has a T-shaped structure, which is fitted on the annular support rod of the horizontal support rod unit and can rotate around the annular support rod.

4. The combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement according to claim 3, characterized in that: The horizontal support rod unit consists of horizontal support rods, annular support rods, annular support rod connecting bolts, a second rotating handle, and first left and right screw rods. The horizontal support rod unit has 12 sets of horizontal support rods, one end of which is threaded to a central fixed seat, and the other end is threaded to the first left and right screw rods. The second rotating handle passes vertically through the center of the first left and right screw rods. Annular support rods are arranged between the horizontal support rods and reliably connected as a whole by the annular support rod connecting bolts. The front end of the first left and right screw rods is threaded to the outer support block support rod of the outer support block unit.

5. The combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement according to claim 4, characterized in that: The inclined support rod unit consists of a lower support rod, an upper support rod, a lower support rod connecting bolt, a second left and right screw rod, a third rotating handle, and an upper support rod connecting bolt. The lower end of the lower support rod is hinged to the support base of the central fixed seat through the lower support rod connecting bolt. The lower support rod and the upper support rod are connected through the second left and right screw rod. The upper end of the upper support rod is hinged to the outer support block support rod of the outer support block unit through the upper support rod connecting bolt. The third rotating handle passes vertically through the center of the second left and right screw rod.

6. The combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement according to claim 5, characterized in that: The central fixed seat consists of a rotating lifting ring, a central welded seat, a support seat, and support seat connecting screws. The central welded seat of the central fixed seat is a welded component with a tapered shaft structure at its bottom, which mates with the tapered hole of the lower lifting seat assembly. The central fixed seat is fixed to the lifting seat by the connecting screws of the support plate assembly. Several sets of support seats are evenly distributed at the lower end of the central welded seat, which are fixed by the support seat connecting screws and hinged to the lower support rod of the inclined support rod unit. Several sets of threaded holes are evenly distributed at the upper end of the central welded seat, which are screwed to the threaded shaft of the horizontal support rod of the horizontal support rod unit. The rotating lifting ring is installed on the upper surface of the central welded seat.

7. The combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement according to claim 1, characterized in that: The personnel operating platform consists of 10 folding stools, 10 support rods, 10 outer ring pedals, and 10 inner ring pedals.

8. The combined detachable internal support and clamping device for sealing boxes based on inclined plane force enhancement according to claim 7, characterized in that: The folding stool consists of an upper panel, diagonal support legs, a first hinge seat, a first connecting pin, a vertical support leg, a second hinge seat, a second connecting pin, a first hinge seat connecting screw, and a second hinge seat connecting screw. The upper panel has flanges on both sides for mounting the outer and inner ring-shaped footrests. The first hinge seat is fixed to the upper panel via the first hinge seat connecting screw. The second hinge seat is also fixed to the upper panel via the second hinge seat connecting screw. One end of the diagonal support leg is connected to the first hinge seat via the first connecting pin, and one end of the vertical support leg is connected to the second hinge seat via the second connecting pin. The diagonal support leg has two sets of positioning pin holes, used for positioning the stool when unfolded and when folded, respectively. The folding stool can be easily removed from the side manhole of the bottom assembly after folding. One end of the support rod is pressed against the welded base, and the other end is pressed against the folding stool to prevent the folding stool from moving backward. An outer ring foot pedal and an inner ring foot pedal are laid between the two folding stools, and two through holes are made on the ring foot pedals.

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