Cylinder section and common bottom lock bottom circular seam fixed inner support automatic leveling and tight supporting 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 leveling and tightening device for a cylinder section and a common bottom lock bottom circular seam fixing inner support. 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 uniformly distributed are laid on the upper surface of the fixed base and used for supporting, positioning and accurately guiding the radial outer supporting block assembly and the radial inner supporting block assembly, and the axial wedge block assembly is fixedly installed on the back of the fixed base; every two sets of axial wedge block assemblies fix one set of radial inner supporting block assembly in a wedge-caulking mode, every two adjacent sets of radial inner supporting block assemblies wedge the radial outer supporting block assembly between the two adjacent sets of radial inner supporting block assemblies, and the outer sides of every two adjacent sets of axial wedge block assemblies are connected with a common-bottom leveling assembly. The device provides strong internal supporting force for the welding state of the common-bottom assembly and the cylinder section lock bottom girth, it is guaranteed that concession does not occur under the action of strong upsetting force of a welding execution mechanism, and the stable and reliable storage tank girth welding process is achieved.

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 leveling and tightening device for fixing inner supports of a cylinder section and a common bottom locking annular seam. 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] 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. According to the state of the annular seam of the rear tank barrel section / common bottom assembly, a set of automatic leveling and tightening devices for the fixed inner supports of the large-diameter barrel section and the common bottom locking bottom annular seam need to be developed. The overall rigidity, internal support capacity and degree of automation of the automatic leveling and tightening devices for the fixed inner supports of the large-diameter barrel section and the common bottom locking bottom annular seam 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 leveling and tightening device for fixing inner supports of a cylinder section and a common bottom locking annular seam, so as to meet the above-mentioned needs.

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

[0010] An automatic leveling and tightening device for fixing inner supports of a cylinder section and a common bottom locking annular seam, comprising a fixed base assembly, a radial inner support block assembly, a radial outer support block assembly, an axial wedge block assembly and a common bottom leveling 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 outer support block assembly and the radial inner support block assembly, and a fixed axial wedge block assembly is installed on the back of the fixed base; every two groups of axial wedge block assemblies are wedged and fixed to a group of radial inner support block assemblies, and two adjacent groups of radial inner support block assemblies are wedged to the radial outer support block assembly therebetween, and a common bottom leveling assembly is connected to the outer sides of the two adjacent groups of axial wedge block assemblies.

[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 common bottom leveling assembly includes two servo motors, two servo motor mounting seats, two couplings, one left-handed and one right-handed spiral elevator and its mounting seat, two spiral elevator top flanges, flange connecting screws, and a positioning connecting plate; the number of common bottom leveling assemblies is 4 groups, and the servo motor, servo motor mounting seat, and coupling of each group of common bottom leveling assemblies are connected to the side of the spiral elevator, the upper end surfaces of the two sets of spiral elevators are connected to the lower surfaces of the two spiral elevator mounting seats, and the two spiral elevator mounting seats are respectively connected to the outer sides of the two adjacent axial wedge block assemblies by bolts, and the two ends of the positioning connecting plate are respectively fixed to the top flanges of the two spiral elevators by flange connecting screws.

[0015] The device is driven by hydraulic drive, including two tensioning schemes:

[0016] 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;

[0017] 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.

[0018] The tightening principle of scheme B:

[0019] (1) The radial outer support block assembly is tightened into place under the drive of the hydraulic cylinder. After being tightened into place, it is reliably locked and does 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 common bottom assembly is expanded by 1mm on one side;

[0020] (2) The radial inner support block assembly is opened under the drive of the hydraulic cylinder. The radial inner support block assembly first fits the inner wall of the product. The cylinder stroke of the radial inner support block assembly is 250mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar reaches 20t;

[0021] (3) The cylinder stroke of the axial wedge block assembly is 150 mm, the cylinder diameter is 160 mm, and the hydraulic cylinder thrust under the pressure of 100 bar reaches 20 tons. By utilizing the principle of inclined plane force amplification, a radial thrust of 200 tons can be generated, 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.

[0022] The uniformly distributed linear guide rails are fixed on the fixed base through guide rail connecting screws.

[0023] The head pad of the inner support block is a common bottom arc pad, and the head pad of the outer support block is a common bottom arc pad.

[0024] The device has an outer dimension of 5000 mm in outer diameter and 900 mm in height, and the fixed base assembly 1 is fixed to the telescopic device or the lifting device by bolt connection.

[0025] The beneficial effects achieved by the present invention are:

[0026] The present invention is a heavy-duty barrel section docking annular seam fixed inner support automatic tightening device for a matching new generation manned launch vehicle 5m diameter common bottom tank body annular seam stir friction welding system. The new generation manned launch vehicle 5m diameter tank body annular seam stir friction welding adopts a vertical assembly welding scheme, which can significantly improve product quality and production efficiency. The welding principle of the tank body annular seam vertical assembly is that the tank body is fixed during welding, and the welding actuator rotates around the tank body to complete the annular seam welding. The function of the large diameter barrel section and the common bottom lock bottom annular seam fixed inner support automatic leveling and tightening device is to provide a strong internal support force for the common bottom assembly (double-layer common bottom assembly and single-layer common bottom assembly) and the barrel section lock bottom annular seam welding state, to ensure that no retreat occurs 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 a stable and reliable tank annular seam welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a composition diagram of an automatic leveling and tightening device for fixing inner supports with a cylinder section and a common bottom locking ring seam;

[0028] Figure 2 Figure A is a composition diagram of a fixed base assembly;

[0029] Figure 3 Figure B is a composition diagram of a fixed base assembly;

[0030] Figure 4 This is a diagram of the radial inner support block assembly;

[0031] Figure 5 This is a diagram of the composition of the radial outer support block assembly;

[0032] Figure 6 This is a diagram of the axial wedge block assembly;

[0033] Figure 7 The bottom leveling assembly is shown in Figure A;

[0034] Figure 8 The common bottom leveling assembly is shown in Figure B;

[0035] 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-common bottom leveling assembly, 6-fixed base, 7-linear guide rail, 8-guide rail connecting screw, 9-inner support block cylinder rear support, 10-first rear support pin shaft, 11-first rear support screw, 12-first common flat key, 13-first positioning pin, 14-rear ear type inner support block cylinder, 15-wedge block, 16-wedge block connecting screw, 17-inner support block base, 18-inner support block cylinder front support, 19-first front support screw, 20-first slider screw, 21-first slider, 22-inner support block head pad connecting screw, 23-inner support block head pad positioning pin, 24-inner support block head pad, 25-outer support block cylinder rear support, 26-second rear support pin shaft, 27-second common flat key, 28-second locating pin, 29-second rear support screw, 30-rear ear type external support block cylinder, 31-external support block cylinder front support, 32-second front support screw, 33-external support block base, 34-second slider screw, 35-second slider, 36-external support block head pad connecting screw, 37-external support block head pad locating pin, 38-external support block head pad, 39-wedge cylinder, 40-wedge cylinder connecting screw, 41-wedge cylinder mounting seat, 42-wedge cylinder mounting seat connecting screw, 43-square falcon wedge block, 44-servo motor, 45-servo motor mounting seat, 46-coupling, 47-screw lift and its mounting seat, 48-screw lift connecting screw, 49-screw lift top flange, 50-flange connecting screw, 51-positioning connecting plate, 52-screw lift fixing seat connecting screw. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] The utility model discloses an automatic leveling and tightening device for fixing inner supports of a barrel section and a common bottom locking ring seam, which adopts a hydraulic drive method to realize automatic tightening of a common bottom assembly (a double-layer common bottom assembly and a single-layer common bottom assembly) and a barrel section locking ring seam, and two self-made hard rails are arranged at the bottom of a radial support block assembly to realize precise guiding of the support block, and the support block performs radial telescopic movement under the action of a rear ear hydraulic cylinder, and the radial support block assembly comprises a plurality of groups of outer support block assemblies and a plurality of groups of inner support block assemblies, and the adjacent outer support blocks and inner support blocks are matched with each other in a yin-yang mold manner, and the interface between two adjacent support blocks is at a certain angle to the radial direction, and 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 reliable locking of all radial support block assemblies.

[0038] An automatic leveling and tightening device for fixing inner supports of a barrel section and a bottom-locking annular seam, comprising a fixed base assembly 1, 8 groups of radial inner support block assemblies 2, 8 groups of radial outer support block assemblies 3, 16 groups of axial wedging block assemblies 4 and 4 groups of bottom-locking leveling assemblies 5. The head bottom-locking arc pads of the outer support block assembly and the inner support block assembly of the fixed inner support device can meet the internal tightening needs of the bottom-locking annular seam of the bottom-locking assembly and the barrel section.

[0039] The inner support block assembly and the outer support block assembly are both connected to the upper surface of the welding base, and the two are spaced apart; the inner support block assembly and the outer support block assembly are both driven by oil cylinders, and the sliders at the bottom thereof run along the guide rails to realize the outward expansion and inward contraction of the inner support block assembly and the outer support block assembly; the back of the welding base is connected with a wedge block assembly, and the wedge block assembly corresponds to the inner support block assembly to realize the back wedging of the inner support block assembly; every two groups of wedge block assemblies wedging and fixing a group of inner support block assemblies. Two adjacent groups of inner support block assemblies can wedge the outer support block assembly between them. A common bottom leveling assembly is connected to the outer sides of two adjacent groups of axial wedging block assemblies.

[0040] The fixed base assembly 1 is composed of a fixed base 6, a linear guide rail 7 and a guide rail connecting screw 8. The fixed base 6 is a ring-shaped welded structural member with a trapezoidal cross-section. 16 pairs of uniformly distributed linear guide rails 7 are laid on its upper surface for supporting, positioning and precisely guiding the 8 groups of radial outer support block assemblies 3 and the 8 groups of radial inner support block assemblies 2. 16 groups of axial wedge block assemblies 4 are installed and fixed on its back. The upper surface of the fixed base 6 is arranged with guide rail grooves and guide rail connecting holes of the linear guide rails 7 and threaded holes and positioning keyways for connecting the rear ear supports of the 8 groups of radial outer support block assemblies 3 and the 8 groups of radial inner support block assemblies 2. The 16 pairs of uniformly distributed linear guide rails 7 are fixed to the fixed base 6 by guide rail connecting screws 8. The back of the fixed base 6 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 as the bearing foundation of the entire inner support device.

[0041] The radial inner support block assembly 2 is composed of an inner support block cylinder rear support 9, a first rear support pin 10, a first rear support screw 11, a first common flat key 12, a first positioning pin 13, a rear ear type inner support block cylinder 14, a wedge block 15, a wedge block connecting screw 16, an inner support block base 17, an inner support block cylinder front support 18, a first front support screw 19, a first slider screw 20, a first slider 21, an inner support block head pad connecting screw 22, an inner support block head pad positioning pin 23, and an inner support block head pad 24. The rear end of the rear-ear type inner support block cylinder 14 is hinged to the inner support block cylinder rear support 9 through the first rear support pin 10, and the inner support block cylinder rear support 9 is fixedly connected to the upper surface of the fixed base assembly 1 through the first common flat key 12, the first positioning pin 13 and the first rear support screw 11; the front end of the rear-ear type inner support block cylinder 14 fixes the inner support block cylinder front support 18 to the back of the inner support block base 17 through the first front support screw 19; a wedge block 15 is arranged on the left and right sides of the back of the inner support block base 17, and is fixedly connected by the wedge block connecting screw 16; two first sliders 21 are symmetrically arranged at the bottom of the inner support block base 17, and are fixedly connected by the first slider screws 20 Fixed connection; the front annular groove of the inner support block base 17 is used to embed the inner support block head pad 24, and is positioned by two inner support block head pad locating pins 23, and several inner support block head pad connecting screws 22 are reliably connected; the inner support block head pad 24 is a common bottom arc pad, which is used for the lock bottom ring seam inner support of the common bottom assembly and the barrel section; the inner support block base 17 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 cylinder, the bottom 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 regular eight-shaped symmetrical inclined surfaces, which form a matching relationship with the inclined surface of the outer support block base 33.

[0042] The radial outer support block assembly 3 is composed of an outer support block cylinder rear support 25, a second rear support pin 26, a second common flat key 27, a second positioning pin 28, a second rear support screw 29, a rear ear type outer support block cylinder 30, an outer support block cylinder front support 31, a second front support screw 32, an outer support block base 33, a second slider screw 34, a second slider 35, an outer support block head pad connecting screw 36, an outer support block head pad positioning pin 37, and an outer support block head pad 38 (common bottom arc pad). The rear end of the rear-ear type external support block cylinder 30 is hinged to the rear support block cylinder support 25 through the second rear support pin 26, and the rear support block cylinder support 25 is fixedly connected to the upper surface of the fixed base assembly 1 through the second common flat key 27, the second positioning pin 28 and the second rear support screw 29; the front end of the rear-ear type external support block cylinder 30 fixes the front support block cylinder support 31 to the back of the external support block base 33 through the second front support screw 32; two second sliders 35 are symmetrically arranged at the bottom of the external support block base 33, and are fixedly connected by the second slider screw 34; the front annular groove of the external support block base 33 is used The outer support block head pad 38 is inlaid and positioned by two outer support block head pad locating pins 37, and several outer support block head pad connecting screws 36 are reliably connected; the outer support block head pad 38 is a common bottom arc pad, which is used for the inner support of the lock bottom ring seam of the common bottom assembly and the barrel section; the outer support block base 33 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 for the front support of the oil cylinder, the bottom is processed with positioning grooves for two slide blocks, the upper surface is processed with a cavity 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 17.

[0043] The axial wedge block assembly 4 is composed of a wedge cylinder 39, a wedge cylinder connecting screw 40, a wedge cylinder mounting seat 41, a wedge cylinder mounting seat connecting screw 42 and a square wedge block 43. The square section of the square wedge block 43 forms a matching relationship with the square hole of the wedge cylinder mounting seat 41, ensuring that the piston rod of the wedge cylinder 39 does not rotate during the pushing out and retracting process. During the wedging process, the front end inclined surface of the square wedge block 43 forms a friction pair with the inclined surface of the wedge block 15. Based on the inclined surface force amplification principle, the thrust of the wedge cylinder 39 can be multiplied and transmitted to the radial inner support block assembly 2, ensuring a strong radial support force. The inclined surface has a self-locking ability, which ensures 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 39 is connected to the square wedge block 43 in a threaded form, and is fixed to the wedging cylinder mounting seat 41 by the wedging cylinder connecting screw 40; the front end shaft diameter of the wedging cylinder mounting seat 41 is matched with the hole diameter of the fixed base 6 for positioning, and the wedging cylinder mounting seat 41 is fixedly connected to the back of the fixed base 6 by the wedging cylinder mounting seat connecting screw 42.

[0044] The main function of the common bottom leveling assembly 5 is to adjust the height of the common bottom assembly to match the theoretical outer surface of the support block of the fixed inner support device with the inner surface of the common bottom assembly to ensure a good inner support effect. The common bottom leveling assembly 5 includes two servo motors 44, two servo motor mounting seats 45, two couplings 46, one left-handed and one right-handed spiral elevator and its mounting seat 47, spiral elevator connecting screws 48, two spiral elevator top flanges 49, flange connecting screws 50, positioning connecting plates 51 and spiral elevator fixing seat connecting screws 52. The number of the common bottom leveling assembly 5 is 4 groups, and the servo motor 44, servo motor mounting seat 45, and coupling 46 of each group of common bottom leveling assembly 5 are connected to the side of the spiral elevator, the upper end surfaces of the two sets of spiral elevators are connected to the lower surfaces of the two spiral elevator mounting seats, and the two spiral elevator mounting seats are respectively connected to the outer sides of the two adjacent axial wedge block assemblies 4 by bolts, and the two ends of the positioning connecting plate 51 are respectively fixed to the top flanges 49 of the two spiral elevators by flange connecting screws 50. The common bottom leveling assembly 5 converts the rotary motion of the servo motor into the lifting motion of the positioning connecting plate through the screw lift.

[0045] The driving mode of the fixed inner support device is hydraulic drive, and there are two tightening schemes for the fixed inner support device:

[0046] 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;

[0047] 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.

[0048] Taking scheme (B) as an example, the tightening principle of the fixed inner support device is explained below:

[0049] (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 common bottom assembly is enlarged by 1mm on one side;

[0050] (2) 8 groups of radial inner support block assemblies are opened under the drive of hydraulic cylinders. The radial inner support block assemblies are first fitted with the inner wall of the product. The cylinder stroke of the radial inner support block assembly is 250mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar reaches 20t;

[0051] (3) The cylinder stroke of the 16 sets of axial wedge block assemblies 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 plane force multiplication, a radial thrust of 200t can be generated, 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. The thrust generated by the hydraulic cylinder is related to the actual load.

[0052] The fixed inner support device has automatic and local adjustment functions. The wedge-tightening cylinder adjusts the extension distance of the inner support block by extending a small stroke, achieving local micro-adjustment to meet the inner support accuracy requirements. The scale is marked on the fixed inner support device to facilitate the operator to judge the extension distance. The box bottom leveling device of the fixed inner support device has the ability to automatically adjust the height of the common bottom assembly. The device can meet the automatic tightening of the 5m diameter common bottom assembly (single-layer common bottom assembly and double-layer common bottom assembly) and the cylinder section lock bottom ring seam and the leveling of the common bottom assembly. The adjustment stroke is 100mm; the device's overall dimensions are approximately: 5000mm outer diameter × 900mm height.

[0053] The hydraulic drive is used to realize the automatic tightening of the common bottom assembly (single-layer common bottom assembly and double-layer common bottom assembly) and the bottom locking ring seam of the barrel section; two self-made hard rails are set at the bottom of the radial support block assembly to realize the 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 plane force amplification principle on the back of the inner support block assembly realize the reliable locking of all radial support block assemblies, which can realize micro-adjustment and have self-locking properties. The device has the function of leveling and height adjustment of the common bottom assembly.

[0054] An automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam: the outer support block assembly, inner support block assembly, axial wedging assembly and leveling and height adjustment device of the device are all automated designs, which can realize automatic control and data feedback. The inner support device has strong rigidity, and the support position can be slightly adjusted, which can effectively eliminate the docking misalignment and has high assembly operation efficiency. The automatic leveling and height adjustment device on the large end face frame of the common bottom of the large diameter tank can automatically feedback the actual height of the large end face and the parallelism with the horizontal plane, and can realize the common bottom locking after adjustment. The device is designed with 16 sets of axial wedging assemblies on the back of the fixed base. Using the principle of inclined force amplification, a single wedging assembly can generate a radial thrust of 200t. After being tightened in place, it can be reliably locked and will not give way under the strong top forging force of stirring welding. The inner support pad on the surface of the support block of the device adopts a combination of contoured cylindrical surface + ellipsoidal surface to meet the support requirements in the locking ring seam welding area. The device can achieve 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.

[0055] The automatic leveling and tightening device for fixing the inner support of the barrel section and the common bottom locking ring 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 5m diameter tank body ring seam stir friction welding system of the new generation of manned carrier rockets, laying an important technical foundation for the development of automatic leveling and tightening devices for fixing the inner support of the large-diameter barrel section and the common bottom locking ring seam of my country's larger diameter and thicker heavy-duty carrier rockets.

Claims

1. An automatic leveling and tightening device for fixing inner supports with a cylinder section and a common bottom locking ring seam, characterized in that: It includes a fixed base assembly, a radial inner support block assembly, a radial outer support block assembly, an axial wedge block assembly and a common bottom leveling 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 outer support block assembly and the radial inner support block assembly, and a fixed axial wedge block assembly is installed on the back of the fixed base; every two groups of axial wedge block assemblies wedge and fix a group of radial inner support block assemblies, and the adjacent two groups of radial inner support block assemblies wedge the radial outer support block assembly therebetween, and the outer sides of the adjacent two groups of axial wedge block assemblies are connected to a common bottom leveling assembly.

2. The automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam according to claim 1 is characterized in that: 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 automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam according to claim 2 is characterized in that: 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 automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam according to claim 2 is characterized in that: 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 automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam according to claim 1 is characterized in that: The common bottom leveling assembly includes two servo motors, two servo motor mounting seats, two couplings, one left-handed and one right-handed spiral elevator and its mounting seat, two spiral elevator top flanges, flange connecting screws, and a positioning connecting plate; the number of common bottom leveling assemblies is 4 groups, and the servo motor, servo motor mounting seat, and coupling of each group of common bottom leveling assemblies are connected to the side of the spiral elevator, the upper end surfaces of the two sets of spiral elevators are connected to the lower surfaces of the two spiral elevator mounting seats, and the two spiral elevator mounting seats are respectively connected to the outer sides of the two adjacent axial wedge block assemblies by bolts, and the two ends of the positioning connecting plate are respectively fixed to the top flanges of the two spiral elevators by flange connecting screws.

6. The automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam according to claim 1 is characterized in that: The device is driven by hydraulic drive, including two tensioning schemes: 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.

7. The automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam according to claim 6 is characterized in that: The tightening principle of scheme B: (1) The radial outer support block assembly is tightened into place under the drive of the hydraulic cylinder. After being tightened into place, it is reliably locked and does 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 common bottom assembly is expanded by 1mm on one side; (2) The radial inner support block assembly is opened under the drive of the hydraulic cylinder. The radial inner support block assembly first fits the inner wall of the product. The cylinder stroke of the radial inner support block assembly is 250mm, the cylinder diameter is 160mm, and the hydraulic cylinder thrust under the pressure of 100bar reaches 20t; (3) The cylinder stroke of the axial wedge block assembly is 150 mm, the cylinder diameter is 160 mm, and the hydraulic cylinder thrust under the pressure of 100 bar reaches 20 tons. By utilizing the principle of inclined plane force amplification, a radial thrust of 200 tons can be generated, 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.

8. The automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam according to claim 1 is characterized in that: The uniformly distributed linear guide rails are fixed on the fixed base through guide rail connecting screws.

9. The automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam according to claim 3 is characterized by: The head pad of the inner support block is a common bottom arc pad, and the head pad of the outer support block is a common bottom arc pad.

10. The automatic leveling and tightening device for fixing the inner support of the cylinder section and the common bottom locking ring seam according to claim 1 is characterized in that: The device has an outer dimension of 5000 mm in outer diameter and 900 mm in height, and the fixed base assembly 1 is fixed to the telescopic device or the lifting device by bolt connection.

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