Heavy-load barrel section butt joint circular seam fixing inner support automatic bracing device

Abstract

The invention belongs to the technical field of friction stir welding of carrier rocket tank body circular seams, and particularly relates to an automatic supporting device for a heavy-load cylinder section butt joint circular seam fixing inner support. Comprising a fixed base assembly, a radial inner supporting block assembly, a radial outer supporting block assembly and an axial wedge block assembly. The fixed base assembly comprises a fixed base and linear guide rails, the fixed base is an annular welding structural part with a trapezoidal section, the linear guide rails which are evenly distributed are laid on the upper surface of the fixed base and used for supporting, positioning and accurately guiding the radial inner supporting block assembly and the radial outer supporting block assembly, and the axial wedge block assembly is fixedly installed on the back of the fixed base. The device provides strong internal supporting force for three girth welding states of a tank bottom assembly and a cylinder section butt joint girth, a cylinder section and cylinder section butt joint girth and a common bottom assembly and cylinder section butt joint girth, it is guaranteed that concession does not occur under the action of strong upsetting force of a welding execution mechanism, and it is guaranteed that a tank body does not move in the friction stir welding process; and the stability and reliability of the storage tank girth welding process are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of friction stir welding of annular seams of a launch vehicle tank body, and in particular relates to an automatic tightening device for fixing inner supports of annular seams of heavy-loaded barrel sections butted against each other. Background Art

[0002] The friction stir welding of the circumferential seam of the 5m diameter tank body of the new generation of manned carrier rocket adopts a vertical assembly welding solution, which can eliminate the adverse effects of deformation of the tank structure caused by gravity during horizontal assembly, reduce the difficulty of product assembly, and 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] Box product materials: 2219 aluminum alloy, 2195 aluminum-lithium alloy and other aerospace high-strength aluminum alloys.

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

[0005] Product structure: The common bottom structure tank consists of four major parts: the front bottom assembly, the rear bottom assembly, the common bottom structure assembly and the intermediate barrel section. The main types of welds involved include: front bottom assembly / barrel section butt ring seam, front box barrel section / barrel section butt ring seam, front box barrel section / common bottom assembly butt ring seam, rear box barrel section / common bottom assembly lock bottom ring seam, rear box barrel section / barrel section butt ring seam, and rear box barrel section / rear bottom assembly butt ring seam.

[0006] Product welding sequence: The vertical assembly welding of the tank body is planned to start from the rear bottom assembly and then be assembled and welded in sequence to the front bottom assembly. No secondary assembly is performed during the welding process. The assembly of the common bottom assembly and the locking bottom ring seam of the fuel tank barrel section is completed in the vertical state on the frame. This mode can eliminate the sealing welding of the fuel tank. During the entire assembly and welding process of the tank, only the sealing welding of the front bottom assembly / barrel section of the oxygen tank is required.

[0007] During the welding process of the vertical assembly scheme of large-diameter tanks, the tank body is fixed, and the welding actuator rotates around the tank body to complete the welding of the annular seam. The maximum welding thickness of the tank product is 20mm. The stir friction welding system is subjected to large upsetting force and forward resistance during welding. For the three annular seam states of the front tank barrel section / barrel section butt annular seam, the front tank barrel section / common bottom assembly butt annular seam, and the rear tank barrel section / rear bottom assembly butt annular seam, a set of heavy-duty barrel section butt annular seam fixed internal support automatic tightening device needs to be developed. The overall rigidity, internal support capacity and degree of automation of the heavy-duty barrel section butt annular seam fixed internal support automatic tightening device directly determine the welding stability, welding quality and welding efficiency of the tank annular seam. Summary of the invention

[0008] The object of the present invention is to provide an automatic tightening device for fixing inner supports of heavy-loaded cylinder section butt joint annular seams to meet the above-mentioned needs.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A heavy-loaded barrel section butt joint annular seam fixed inner support automatic tightening device comprises a fixed base assembly, a radial inner support block assembly, a radial outer support block assembly and an axial wedging block assembly; the fixed base assembly comprises a fixed base and a linear guide rail, the fixed base is an annular welded structural member with a trapezoidal cross-section, and its upper surface is paved with uniformly distributed linear guide rails for supporting, positioning and precisely guiding the radial inner support block assembly and the radial outer support block assembly, and a fixed axial wedging block assembly is installed on the back of the fixed base.

[0011] The radial inner support block assembly is composed of the inner support block cylinder rear support, the first rear support pin shaft, the first rear support screw, the first common flat key, the first positioning pin, the rear ear type inner support block cylinder, the wedge block, the wedge block connecting screws, the inner support block base, the inner support block cylinder front support, the first front support screw, the first slider screw, the first slider, the inner support block head pad connecting screws, the inner support block head pad positioning pin, and the inner support block head pad; the rear end of the rear ear type inner support block cylinder is hinged to the inner support block cylinder rear support through the first rear support pin shaft, and the inner support block cylinder rear support is fixed to the upper surface of the fixed base assembly through the first common flat key, the first positioning pin and the first rear support screw; the front end of the rear ear type inner support block cylinder is connected to the inner support block cylinder front support through the first front support screw It is fixed on the back side of the inner support block base; a wedge block is arranged on the left and right sides of the back side of the inner support block base, and is fixedly connected by wedge block connecting screws; two first sliding blocks are symmetrically arranged on the bottom of the inner support block base, and are fixedly connected by first sliding block screws; the front annular groove of the inner support block base is used to embed the inner support block head pad, and is positioned by two inner support block head pad locating pins, and is connected by several inner support block head pad connecting screws; the inner support block base is a fan-shaped structure as a whole, with an annular groove processed on the front side, a connecting plane between the wedge block and the front support of the inner support block cylinder processed on the back side, two first sliding block locating grooves processed on the bottom, a cavity processed on the upper surface for weight reduction, and the left and right side surfaces are symmetrical inclined surfaces in a regular shape, which form a matching relationship with the inclined surface of the outer support block base.

[0012] The radial outer support block assembly is composed of an outer support block cylinder rear support, a second rear support pin shaft, a second common flat key, a second locating pin, a second rear support screw, a rear ear type outer support block cylinder, an outer support block cylinder front support, a second front support screw, an outer support block base, a second slider screw, a second slider, an outer support block head pad connecting screw, an outer support block head pad locating pin, and an outer support block head pad; the rear end of the rear ear type outer support block cylinder is hinged to the outer support block cylinder rear support through the second rear support pin shaft, and the outer support block cylinder rear support is fixedly connected to the upper surface of the fixed base assembly through the second common flat key, the second locating pin and the second rear support screw; the front end of the rear ear type outer support block cylinder is connected to the outer support block cylinder through the second The front support screw fixes the front support of the outer support block cylinder to the back of the outer support block base; two second sliders are symmetrically arranged on the bottom of the outer support block base and fixedly connected by the second slider screws; the front annular groove of the outer support block base is used to embed the outer support block head pad, and is positioned by two outer support block head pad locating pins, and is connected by several outer support block head pad connecting screws; the outer support block base is a fan-shaped structure as a whole, with an annular groove processed on the front, a connecting plane of the front support of the outer support block cylinder processed on the back, positioning grooves for two second sliders processed on the bottom, a cavity processed on the upper surface for weight reduction, and the left and right side surfaces are inverted eight-shaped symmetrical inclined surfaces, which form a matching relationship with the inclined surface of the inner support block base.

[0013] The axial wedge block assembly consists of a wedge cylinder, a wedge cylinder connecting screw, a wedge cylinder mounting seat, a wedge cylinder mounting seat connecting screws and a square wedge block; the square section of the square wedge block forms a matching relationship with the square hole of the wedge cylinder mounting seat to ensure that the piston rod of the wedge cylinder does not rotate during the pushing out and retracting process; during the wedging process, the front end inclined surface of the square wedge block forms a friction pair with the inclined surface of the wedge block, and based on the inclined surface force amplification principle, the thrust of the wedge cylinder can be multiplied and transmitted to the radial inner support block. The assembly ensures a strong radial tightening force, and the inclined surface has a self-locking ability, which ensures that there is no retreat during the welding process when the huge upsetting force is endured during welding; the piston rod of the wedge-tightening cylinder is connected to the square wedge block in a threaded form, and is fixed to the wedge-tightening cylinder mounting seat by the wedge-tightening cylinder connecting screw; the front end shaft diameter of the wedge-tightening cylinder mounting seat is matched with the hole diameter of the fixed base for positioning, and the wedge-tightening cylinder mounting seat is fixedly connected to the back of the fixed base by the wedge-tightening cylinder mounting seat connecting screw.

[0014] The device has two tightening options:

[0015] Solution A: The radial outer support block assembly and the radial inner support block assembly are alternately loaded, the radial outer support block assembly and the radial inner support block assembly are radially extended at the same time, the back of the axial wedging block assembly is wedged, and the radial inner support block assembly is supported by a strong force-increasing effect, thereby tightening the barrel section;

[0016] Solution B: After the radial outer support block assembly is tightened into place, all radial inner support block assemblies follow, and finally the large barrel section is wedged and supported by the axial wedging block assembly, thereby ensuring that the radial inner support block assembly and the radial outer support block assembly are in close contact with the inner wall of the barrel section.

[0017] The tightening principle of Scheme B: The radial outer support block assembly is tightened into place under the drive of the hydraulic cylinder. After being tightened into place, it can be reliably locked without retreating. The cylinder stroke of the radial outer support block assembly is 150mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar is 20t, which ensures that the 30mm thick barrel section is enlarged by 1-2mm on one side, and the theoretical inner surface diameter of the barrel section is 4992mm; the radial inner support block assembly is opened under the drive of the hydraulic cylinder and fits the inner wall of the product first. The cylinder stroke of the inner support block assembly is 250mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar is 20t; the cylinder stroke of the axial wedge block assembly is 150mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar is 20t. By using the principle of inclined surface force amplification, a radial thrust of 200t can be generated, thereby ensuring that both the radial inner support block assembly and the radial outer support block assembly fit the inner wall of the barrel section.

[0018] The head pad of the outer support block includes a flat pad and an arc-shaped pad.

[0019] The inner support block head pad includes a flat pad and an arc-shaped pad.

[0020] The uniformly distributed linear guide rails are fixed on the fixed base through guide rail connecting screws.

[0021] The device has an overall dimension of 5000mm outer diameter × 900mm height, and the fixed base assembly is fixed to the telescopic device or lifting device by bolt connection.

[0022] The beneficial effects achieved by the present invention are:

[0023] The present invention is a heavy-duty barrel segment butt joint annular seam fixed inner support automatic tightening device for a new generation of manned launch vehicle 5m diameter common bottom tank annular seam friction stir welding system. The new generation of manned launch vehicle 5m diameter tank annular seam friction stir welding adopts a vertical assembly welding scheme. For large diameter and long launch vehicle tanks, the use of vertical welding can significantly improve product assembly welding quality and production efficiency. The welding principle of the vertical assembly of the tank body annular seam is that the tank body is fixed during the welding process, and the welding actuator rotates around the tank body to complete the stir friction welding of the annular seam. During the stir welding process, the back of the material must be firmly attached to the rigid internal support device. The heavy-duty barrel section butt annular seam fixed internal support automatic tightening device is used to provide strong internal support for the three annular seam welding states of the tank bottom assembly and the barrel section butt annular seam, the barrel section and the barrel section butt annular seam, and the common bottom assembly and the barrel section butt annular seam, to ensure that there is no retreat under the strong forging force of the welding actuator, and to cooperate with the external pressure clamp system to achieve reliable fixation of the two components to be welded, to ensure that the tank body does not move during the stir friction welding process, and to achieve stable and reliable tank annular seam welding process. After welding is completed, the internal support block can automatically retract a certain distance, so that the tank body can be lifted to tighten and weld the next annular seam. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a composition diagram of an automatic tightening device for fixing inner supports of heavy-duty barrel section butt joint annular seam;

[0025] Figure 2 Figure A is a composition diagram of a fixed base assembly;

[0026] Figure 3 Figure B is a composition diagram of a fixed base assembly;

[0027] Figure 4 This is a diagram of the radial inner support block assembly;

[0028] Figure 5 This is a diagram of the composition of the radial outer support block assembly;

[0029] Figure 6 This is a diagram of the axial wedge block assembly;

[0030] In the figure: 1-fixed base assembly, 2-radial inner support block assembly, 3-radial outer support block assembly, 4-axial wedge block assembly, 5-fixed base, 6-linear guide rail, 7-guide rail connecting screw, 8-inner support block cylinder rear support, 9-first rear support pin shaft, 10-first rear support screw, 11-first common flat key, 12-first positioning pin, 13-rear ear type inner support block cylinder, 14-wedge block, 15-wedge block connecting screw, 16-inner support block base, 17-inner support block cylinder front support, 18-first front support screw, 19-first slider screw, 20-first slider, 21-inner support block head pad connecting screw, 22-inner support block head pad positioning Pin, 23-inner support block head pad, 24-outer support block cylinder rear support, 25-second rear support pin, 26-second ordinary flat key, 27-second positioning pin, 28-second rear support screw, 29-rear ear type outer support block cylinder, 30-outer support block cylinder front support, 31-second front support screw, 32-outer support block base, 33-second slider screw, 34-second slider, 35-outer support block head pad connecting screw, 36-outer support block head pad positioning pin, 37-outer support block head pad, 38-wedge cylinder, 39-wedge cylinder connecting screw, 40-wedge cylinder mounting seat, 41-wedge cylinder mounting seat connecting screw, 42-square falcon wedge block. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The invention discloses an automatic tightening device for fixing the annular seam of heavy-duty barrel sections butt joints. The device adopts a hydraulic drive method to realize the automatic tightening of the annular seam between barrel sections and barrel sections / box bottom / common bottom. Two self-made hard rails are arranged at the bottom of the radial support block assembly to realize the precise guidance of the support block. Under the action of the rear ear hydraulic cylinder, the support block performs radial telescopic movement. The radial support block assembly includes several groups of outer support block assemblies and several groups of inner support block assemblies. The adjacent outer support blocks and inner support blocks are matched with each other in the manner of male and female molds. The intersection surface of two adjacent support blocks is at a certain angle to the radial direction. Two axial wedging assemblies based on the inclined plane force amplification principle are added to the back of each group of inner support block assemblies to realize the reliable locking of all radial support block assemblies.

[0033] A heavy-duty barrel segment butt joint annular seam fixed inner support automatic tightening device comprises a fixed base assembly 1, 8 groups of radial inner support block assemblies 2, 8 groups of radial outer support block assemblies 3 and 16 groups of axial wedge block assemblies 4. The head pads (including flat pads and arc pads) of the outer support block assembly and the inner support block assembly can be quickly replaced to meet the internal tightening needs of the box bottom assembly and the barrel segment annular seam, the barrel segment annular seam and the common bottom assembly and the barrel segment annular seam.

[0034] The fixed base assembly 1 is composed of a fixed base 5, a linear guide rail 6 and a guide rail connecting screw 7. The fixed base 5 is a ring-shaped welded structural member with a trapezoidal cross-section. 16 pairs of evenly distributed linear guide rails 6 are laid on its upper surface for supporting, positioning and precisely guiding the 8 groups of radial inner support block assemblies 2 and the 8 groups of radial outer support block assemblies 3. 16 groups of axial wedge block assemblies 4 are installed and fixed on its back. The upper surface of the fixed base 5 is arranged with guide rail grooves and guide rail connecting holes of the linear guide rails 6 and threaded holes and positioning keyways for connecting the rear ear supports of the 8 groups of radial inner support block assemblies 2 and the 8 groups of radial outer support block assemblies 3. The 16 pairs of evenly distributed linear guide rails 6 are fixed to the fixed base 5 by guide rail connecting screws 7. The back of the fixed base 5 is arranged with 16 positioning holes and threaded connecting holes of the axial wedge block assemblies 4. The fixed base assembly 1 is fixed to a telescopic device / lifting device as a whole by bolt connection, serving as the bearing foundation of the entire inner support device.

[0035] The radial inner support block assembly 2 is composed of an inner support block cylinder rear support 8, a first rear support pin 9, a first rear support screw 10, a first common flat key 11, a first positioning pin 12, a rear ear type inner support block cylinder 13, two wedge blocks 14, a wedge block connecting screw 15, an inner support block base 16, an inner support block cylinder front support 17, a first front support screw 18, a first slider screw 19, a first slider 20, an inner support block head pad connecting screw 21, an inner support block head pad positioning pin 22, and an inner support block head pad 23 (two types: flat pads and arc pads). The rear end of the rear-ear type inner support block cylinder 13 is hinged to the inner support block cylinder rear support 8 through the first rear support pin shaft 9, and the inner support block cylinder rear support 8 is fixedly connected to the upper surface of the fixed base assembly 1 through the first common flat key 11, the first positioning pin 12 and the first rear support screw 10; the front end of the rear-ear type inner support block cylinder 13 fixes the inner support block cylinder front support 17 to the back side of the inner support block base 16 through the first front support screw 18; a wedge block 14 is arranged on the left and right sides of the back side of the inner support block base 16, and is fixedly connected by the wedge block connecting screw 15; two first sliding blocks 20 are symmetrically arranged on the bottom of the inner support block base 16, and are fixedly connected by the first sliding block screw 19; the front annular groove of the inner support block base 16 is used to embed the inner support block head pad 23, and is positioned by two inner support block head pad positioning pins 22, and several inner support block head pad connecting screws 21 are reliably connected. There are two types of head pads 23 of the inner support block, namely flat pads and arc pads. The state switching is realized by removing the head pad connection screws 21 of the inner support block and replacing the pads. The inner support block base 16 is a fan-shaped structure as a whole. The front side is processed with a positioning annular groove for the head pad, the back side is processed with a connecting plane between the wedge block and the front support of the oil cylinder, the bottom side is processed with positioning grooves for two sliders, the upper surface is processed with a cavity for weight reduction, and the left and right side surfaces are symmetrical inclined surfaces, which form a matching relationship with the inclined surface of the outer support block base 32.

[0036] The radial outer support block assembly 3 is composed of an outer support block cylinder rear support 24, a second rear support pin 25, a second common flat key 26, a second positioning pin 27, a second rear support screw 28, a rear ear type outer support block cylinder 29, an outer support block cylinder front support 30, a second front support screw 31, an outer support block base 32, a second slider screw 33, a second slider 34, an outer support block head pad connecting screw 35, an outer support block head pad positioning pin 36, and an outer support block head pad 37 (two types: flat pad and arc pad). The rear end of the rear ear type external support block cylinder 29 is hinged to the rear support block cylinder support 24 through the second rear support pin shaft 25, and the rear support block cylinder support 24 is fixedly connected to the upper surface of the fixed base assembly 1 through the second common flat key 26, the second positioning pin 27 and the second rear support screw 28; the front end of the rear ear type external support block cylinder 29 fixes the front support block cylinder support 30 to the back side of the external support block base 32 through the second front support screw 31; two second sliders 34 are symmetrically arranged at the bottom of the external support block base 32, and are fixedly connected by the second slider screw 33; the front annular groove of the external support block base 32 is used to embed the external support block head pad 37, and is positioned by two external support block head pad positioning pins 36, and several external support block head pad connecting screws 35 are reliably connected; there are two types of external support block head pads 37, namely flat pads and arc pads, and the state switching is realized by removing the external support block head pad connecting screws 35 and replacing the pads. The outer support block base 32 is a fan-shaped structure as a whole, with a positioning annular groove for the head pad processed on the front, a connecting plane for the front support of the cylinder processed on the back, positioning grooves for two sliders processed on the bottom, a cavity processed on the upper surface for weight reduction, and the left and right side surfaces are inverted eight-shaped symmetrical inclined surfaces, which form a matching relationship with the inclined surface of the inner support block base 16.

[0037] The axial wedge block assembly 4 is composed of a wedge cylinder 38, a wedge cylinder connecting screw 39, a wedge cylinder mounting seat 40, a wedge cylinder mounting seat connecting screw 41 and a square wedge block 42. The square section of the square wedge block 42 forms a matching relationship with the square hole of the wedge cylinder mounting seat 40 to ensure that the piston rod of the wedge cylinder 38 does not rotate during the pushing out and retracting process. During the wedging process, the front end inclined surface of the square wedge block 42 forms a friction pair with the inclined surface of the wedge block 14. Based on the inclined surface force amplification principle, the thrust of the wedge cylinder 38 can be multiplied and transmitted to the radial inner support block assembly 2 to ensure a strong radial support force. The inclined surface has a self-locking ability to ensure that there is no yielding phenomenon during the welding process when the huge upsetting force is subjected to welding. The piston rod of the wedging cylinder 38 is connected to the square wedge block 42 in a threaded form, and is fixed to the wedging cylinder mounting seat 40 by the wedging cylinder connecting screw 39; the front end shaft diameter of the wedging cylinder mounting seat 40 is matched with the hole diameter of the fixed base 5 for positioning, and the wedging cylinder mounting seat 40 is fixedly connected to the back of the fixed base 5 by the wedging cylinder mounting seat connecting screw 41.

[0038] The driving mode of the fixed inner support device is hydraulic drive, and there are two tightening schemes for the fixed inner support device:

[0039] Solution (A): The radial outer support block assembly and the radial inner support block assembly are alternately loaded, the radial outer support block assembly and the radial inner support block assembly are radially extended at the same time, the back of the axial wedging block assembly is wedged, and the radial inner support block assembly is supported by a strong force-enhancing effect, thereby tightening the barrel section;

[0040] Solution (B): After the radial outer support block assembly is tightened into place, all radial inner support block assemblies follow, and finally the large barrel section is wedged and supported by the axial wedging block assembly, thereby ensuring that the radial inner support block assembly and the radial outer support block assembly are in close contact with the inner wall of the barrel section.

[0041] Taking scheme (B) as an example, the tightening principle of the fixed inner support device is explained below:

[0042] (1) The 8 groups of radial outer support block assemblies are tightened into place under the drive of the hydraulic cylinder. After being tightened into place, they are reliably locked and do not yield. The cylinder stroke of the radial outer support block assembly is 150mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar reaches 20t, ensuring that the 30mm thick barrel section is expanded by 1~2mm on one side. The theoretical inner surface diameter of the barrel section is Ф4992mm;

[0043] (2) 8 groups of radial inner support block assemblies are opened by hydraulic cylinders and first fit against the inner wall of the product. The cylinder stroke of the inner support block assembly is 250mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under 100bar pressure reaches 20t;

[0044] (3) The stroke of the 16 axial wedge block assemblies is 150 mm, the cylinder diameter is 160 mm, and the hydraulic cylinder thrust under 100 bar pressure is 20 tons. By using the principle of inclined plane force amplification, a radial thrust of 200 tons can be generated, thereby ensuring that the inner and outer support blocks are in close contact with the inner wall of the barrel section. The thrust generated by the hydraulic cylinder is related to the actual load.

[0045] The fixed inner support device has automatic and local adjustment functions. The wedge-tightening cylinder adjusts the extension distance of the radial inner support block assembly by extending a small stroke, achieving local micro-adjustment to meet the inner support accuracy requirements. In addition, the scale is marked on the fixed inner support device to facilitate the operator to judge the extension distance.

[0046] The head pad of the device can be quickly replaced, which can meet the automatic tightening of the 5m diameter cylinder section and cylinder section / box bottom / common bottom annular seam; the device dimensions are approximately: 5000mm (outer diameter) × 900mm (height). The hydraulic drive method is used to achieve the automatic tightening of the cylinder section and cylinder section / box bottom / common bottom annular seam; two self-made hard rails are set at the bottom of the radial support block assembly to achieve precise guidance of the support block; the adjacent outer support blocks and inner support blocks are matched with each other in a male-female mold; the two axial wedge tightening assemblies based on the inclined force amplification principle on the back of the inner support block assembly realize the reliable locking of all radial support block assemblies, which can achieve micro-adjustment and have self-locking properties.

[0047] An automatic tightening device for fixing the inner support of the heavy-duty barrel section butt joint annular seam: It includes 8 groups of outer support block assemblies and 8 groups of inner support block assemblies. The interface between the two types of support blocks is at a certain angle to the radial direction, and they are matched with each other in a male-female mold. The theoretical outer diameter of all support block assemblies after being extended is 1 to 2 mm larger than the theoretical inner diameter of the tank product, and the safety distance of all support block assemblies after being retracted is not less than 100 mm. On the one hand, when the support block assembly moves to the final state, the gap between adjacent support blocks is very small. On the other hand, the clamping margin of the product is increased, which can achieve 360° full fit between the inner surface of the product and the back pad, avoiding welding defects caused by non-fitting of the back of the welding area. The device has 16 groups of axial wedging assemblies designed on the back of the fixed base. Using the principle of inclined force amplification, a single wedging assembly can generate a radial thrust of 200 tons. After being tightened in place, it can be reliably locked and will not yield under the strong upsetting force of stirring welding. The radial outer support block assembly, radial inner support block assembly and axial wedging assembly of the device are all hydraulically driven, which can realize automatic control, strong inner support rigidity and high operating efficiency. The device can realize local micro-adjustment through the axial movement of the axial wedging assembly to ensure the fit between all radial support blocks and the inner profile of the barrel section.

[0048] The automatic tightening device for fixing the inner support of the heavy-duty barrel section butt joint annular seam is a key component of the vertical assembly welding system of the 5m diameter tank. The device dimensions are: outer diameter × height = 5000mm × 900mm. It will currently be used in the circumferential seam stir friction welding system of the 5m diameter tank body of the new generation of manned carrier rockets, laying an important technical foundation for the development of the automatic tightening device for fixing the inner support of the annular seam of the barrel section butt joint of my country's larger diameter and thicker heavy-duty carrier rockets.

Claims

1. An automatic tightening device for fixing inner supports of heavy-duty cylinder section butt joint annular seam, characterized in that: It includes a fixed base assembly, a radial inner support block assembly, a radial outer support block assembly and an axial wedging block assembly; the fixed base assembly includes a fixed base and a linear guide rail, the fixed base is an annular welded structural member with a trapezoidal cross-section, and its upper surface is paved with evenly distributed linear guide rails for supporting, positioning and precisely guiding the radial inner support block assembly and the radial outer support block assembly, and a fixed axial wedging block assembly is installed on the back of the fixed base.

2. The heavy-duty cylinder section butt joint annular seam fixed inner support automatic tightening device according to claim 1 is characterized by: The radial inner support block assembly is composed of the inner support block cylinder rear support, the first rear support pin shaft, the first rear support screw, the first common flat key, the first positioning pin, the rear ear type inner support block cylinder, the wedge block, the wedge block connecting screws, the inner support block base, the inner support block cylinder front support, the first front support screw, the first slider screw, the first slider, the inner support block head pad connecting screws, the inner support block head pad positioning pin, and the inner support block head pad; the rear end of the rear ear type inner support block cylinder is hinged to the inner support block cylinder rear support through the first rear support pin shaft, and the inner support block cylinder rear support is fixed to the upper surface of the fixed base assembly through the first common flat key, the first positioning pin and the first rear support screw; the front end of the rear ear type inner support block cylinder is connected to the inner support block cylinder front support through the first front support screw It is fixed on the back side of the inner support block base; a wedge block is arranged on the left and right sides of the back side of the inner support block base, and is fixedly connected by wedge block connecting screws; two first sliding blocks are symmetrically arranged on the bottom of the inner support block base, and are fixedly connected by first sliding block screws; the front annular groove of the inner support block base is used to embed the inner support block head pad, and is positioned by two inner support block head pad locating pins, and is connected by several inner support block head pad connecting screws; the inner support block base is a fan-shaped structure as a whole, with an annular groove processed on the front side, a connecting plane between the wedge block and the front support of the inner support block cylinder processed on the back side, two first sliding block locating grooves processed on the bottom, a cavity processed on the upper surface for weight reduction, and the left and right side surfaces are symmetrical inclined surfaces in a regular shape, which form a matching relationship with the inclined surface of the outer support block base.

3. The heavy-duty barrel section butt joint annular seam fixed inner support automatic tightening device according to claim 2 is characterized by: The radial outer support block assembly is composed of an outer support block cylinder rear support, a second rear support pin shaft, a second common flat key, a second locating pin, a second rear support screw, a rear ear type outer support block cylinder, an outer support block cylinder front support, a second front support screw, an outer support block base, a second slider screw, a second slider, an outer support block head pad connecting screw, an outer support block head pad locating pin, and an outer support block head pad; the rear end of the rear ear type outer support block cylinder is hinged to the outer support block cylinder rear support through the second rear support pin shaft, and the outer support block cylinder rear support is fixedly connected to the upper surface of the fixed base assembly through the second common flat key, the second locating pin and the second rear support screw; the front end of the rear ear type outer support block cylinder is connected to the outer support block cylinder through the second The front support screw fixes the front support of the outer support block cylinder to the back of the outer support block base; two second sliders are symmetrically arranged on the bottom of the outer support block base and fixedly connected by the second slider screws; the front annular groove of the outer support block base is used to embed the outer support block head pad, and is positioned by two outer support block head pad locating pins, and is connected by several outer support block head pad connecting screws; the outer support block base is a fan-shaped structure as a whole, with an annular groove processed on the front, a connecting plane of the front support of the outer support block cylinder processed on the back, positioning grooves for two second sliders processed on the bottom, a cavity processed on the upper surface for weight reduction, and the left and right side surfaces are inverted eight-shaped symmetrical inclined surfaces, which form a matching relationship with the inclined surface of the inner support block base.

4. The heavy-duty barrel section butt joint annular seam fixed inner support automatic tightening device according to claim 2 is characterized by: The axial wedge block assembly consists of a wedge cylinder, a wedge cylinder connecting screw, a wedge cylinder mounting seat, a wedge cylinder mounting seat connecting screws and a square wedge block; the square section of the square wedge block forms a matching relationship with the square hole of the wedge cylinder mounting seat to ensure that the piston rod of the wedge cylinder does not rotate during the pushing out and retracting process; during the wedging process, the front end inclined surface of the square wedge block forms a friction pair with the inclined surface of the wedge block, and based on the inclined surface force amplification principle, the thrust of the wedge cylinder can be multiplied and transmitted to the radial inner support block. The assembly ensures a strong radial tightening force, and the inclined surface has a self-locking ability, which ensures that there is no retreat during the welding process when the huge upsetting force is endured during welding; the piston rod of the wedge-tightening cylinder is connected to the square wedge block in a threaded form, and is fixed to the wedge-tightening cylinder mounting seat by the wedge-tightening cylinder connecting screw; the front end shaft diameter of the wedge-tightening cylinder mounting seat is matched with the hole diameter of the fixed base for positioning, and the wedge-tightening cylinder mounting seat is fixedly connected to the back of the fixed base by the wedge-tightening cylinder mounting seat connecting screw.

5. The heavy-duty cylinder section butt joint annular seam fixed inner support automatic tightening device according to claim 1 is characterized by: The device has two tightening options: Solution A: The radial outer support block assembly and the radial inner support block assembly are alternately loaded, the radial outer support block assembly and the radial inner support block assembly are radially extended at the same time, the back of the axial wedging block assembly is wedged, and the radial inner support block assembly is supported by a strong force-increasing effect, thereby tightening the barrel section; Solution B: After the radial outer support block assembly is tightened into place, all radial inner support block assemblies follow, and finally the large barrel section is wedged and supported by the axial wedging block assembly, thereby ensuring that the radial inner support block assembly and the radial outer support block assembly are in close contact with the inner wall of the barrel section.

6. The heavy-load barrel section butt joint annular seam fixed inner support automatic tightening device according to claim 5 is characterized by: The tightening principle of Scheme B: The radial outer support block assembly is tightened into place under the drive of the hydraulic cylinder. After being tightened into place, it can be reliably locked without retreating. The cylinder stroke of the radial outer support block assembly is 150mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar is 20t, which ensures that the 30mm thick barrel section is enlarged by 1-2mm on one side, and the theoretical inner surface diameter of the barrel section is 4992mm; the radial inner support block assembly is opened under the drive of the hydraulic cylinder and fits the inner wall of the product first. The cylinder stroke of the inner support block assembly is 250mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar is 20t; the cylinder stroke of the axial wedge block assembly is 150mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar is 20t. By using the principle of inclined surface force amplification, a radial thrust of 200t can be generated, thereby ensuring that both the radial inner support block assembly and the radial outer support block assembly fit the inner wall of the barrel section.

7. The heavy-duty cylinder section butt joint annular seam fixed inner support automatic tightening device according to claim 3 is characterized by: The head pad of the outer support block includes a flat pad and an arc-shaped pad.

8. The heavy-duty cylinder section butt joint annular seam fixed inner support automatic tightening device according to claim 2 is characterized by: The inner support block head pad includes a flat pad and an arc-shaped pad.

9. The heavy-duty cylinder section butt joint annular seam fixed inner support automatic tightening device according to claim 1 is characterized by: The uniformly distributed linear guide rails are fixed on the fixed base through guide rail connecting screws.

10. The heavy-duty cylinder section butt joint annular seam fixed inner support automatic tightening device according to claim 1, characterized in that: The device has an overall dimension of 5000mm outer diameter × 900mm height, and the fixed base assembly is fixed to the telescopic device or lifting device by bolt connection.

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