CN219274912U

CN219274912U - Positioning tool for welding expansion section of multi-section conical shell

Info

Publication number: CN219274912U
Application number: CN202222974602.XU
Authority: CN
Inventors: 王宁宁; 蒙永胜; 刘丽莉; 熊然; 张珊; 王艳莹; 卢文博; 何俊红; 白雪侠; 杨波; 杨礼军
Original assignee: Xi'an Spaceflight Power Machinery Co ltd
Current assignee: Xi'an Spaceflight Power Machinery Co ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-06-30
Anticipated expiration: 2032-11-09

Abstract

A positioning tool for welding an expansion section of a multi-section conical shell comprises a base, a trapezoid plate, a bottom jacket, a top jacket and a top cover. The trapezoid plates are inserted into the upper surface of the chassis, and the included angle between the trapezoid plates is 120 degrees. Three axial long rods and three axial short rods are respectively fixed on the upper surface of the chassis, the top ends of the long rods are respectively fixedly connected with the cantilever ends of the connecting rods on the top jacket, and the top ends of the short rods are respectively fixedly connected with the cantilever ends of the connecting rods on the bottom jacket. When in use, each section of the expansion section of the multi-section conical shell is sleeved on the trapezoid plate respectively and is fastened through the bottom jacket and the top jacket. The top cap is installed on the top of this base through the screw thread. The utility model realizes the pre-welding positioning of the multi-section conical shell, ensures that the shell is always uniformly stressed in the positioning welding process, is easy to operate and has good assembly effect, greatly reduces the manual operation error, improves the qualification rate of workpieces and reduces the production cost.

Description

Positioning tool for welding expansion section of multi-section conical shell

Technical Field

The utility model relates to the field of solid rocket engine metal conical shell expansion section processing and manufacturing, in particular to a positioning tool for welding a welding line of a multistage conical shell expansion section.

Background

The conical metal casing expansion section is a critical component in solid rocket engines. The existing rocket engine shell is usually manufactured by adopting a welding method, and the assembly precision of each part directly influences the working characteristics of the engine. The expansion section before welding is installed and positioned accurately on the tool, and the coaxiality of all parts is kept after assembly, so that the solid rocket engine can work reliably and stably.

At present, the assembly and positioning of the engine shell before welding are mainly realized by a welding tool. For example, in the utility model creation of publication number CN107443002A, a design expanding type internal support tool and an external hoop type tool are disclosed, the roundness of the thin-wall cylinder body is regulated through the expanding type internal support tool, and the elliptical high point of the thin-wall cylinder body is restrained and corrected by means of the external hoop type tool, so that the assembly dislocation before welding the cylinder body and a connecting piece reaches a smaller value, and the problem of welding and positioning of a straight cylindrical shell is solved. The utility model creation of the publication No. CN 109382630A discloses a semi-cylindrical shell butt welding positioning tool and a positioning method, which solve the problem of how to accurately butt-position two semi-cylindrical shells so as to facilitate the smooth operation of inner weld welding. The prior art mainly solves the assembly and butt joint problem of equal-diameter parts, and an effective method is not provided for assembly and welding of parts with different sizes and dimensions at the butt joint position. Therefore, accurate butt positioning of the expansion sections of the multi-section conical shell becomes a technical problem to be solved.

Disclosure of Invention

In order to solve the problem that welding, assembling and positioning of the expansion section of the multi-section conical shell are difficult in the prior art, the utility model provides a positioning tool for welding the expansion section of the multi-section conical shell. The utility model provides a positioning tool for welding an expansion section of a multi-section conical shell.

The utility model comprises a base, a trapezoid plate, a bottom jacket, a top jacket and a top cover. The bottom jacket and the top jacket are respectively matched with the base for use.

The base consists of a chassis and three trapezoid boards; each trapezoid board is inserted into the upper surface of the chassis, and the included angle between each trapezoid board is 120 degrees. Three axial long rods and three axial short rods are respectively fixed on the upper surface of the chassis, the top ends of the long rods are respectively fixedly connected with the cantilever ends of the connecting rods on the top jacket, and the top ends of the short rods are respectively fixedly connected with the cantilever ends of the connecting rods on the bottom jacket. When in use, each section of the expansion section of the multi-section conical shell is sleeved on the trapezoid plate respectively and is fastened through the bottom jacket and the top jacket. The top cap is installed on the top of this base through the screw thread.

Supporting ribs are distributed in the circular ring of the chassis in the base, and three horizontal clamping grooves for clamping the trapezoid plates are distributed on the upper surface of the supporting ribs; the included angle between each horizontal clamping groove is 120 degrees.

The center of the chassis is provided with an axial center rod; three vertical clamping grooves for clamping the trapezoid plates are uniformly distributed on the surface of the central rod; the three vertical clamping grooves are respectively in one-to-one correspondence with the three horizontal grooves.

The trapezoid plate in the base is in a right triangle shape. The vertical edges of the trapezoid plates are respectively matched with the vertical clamping grooves on the surface of the central rod, and the horizontal edges of the trapezoid plates are respectively matched with the horizontal clamping grooves on the surface of the chassis supporting rib.

The bevel edge of the trapezoid plate is three-level stepped; the three-stage stepped horizontal plane of the stepped plate is respectively flush with the upper surfaces of the throat lining shell, the cone section shell and the tail ring shell from top to bottom, and the inclined planes of the steps from top to bottom are respectively attached to the inner surfaces of the throat lining shell, the cone section shell and the tail ring shell from top to bottom.

The bottom jacket and the top jacket are respectively composed of two annular jackets and three connecting rods 18; the jacket is divided into an upper jacket and a lower jacket; the upper jacket and the lower jacket are axially stacked, a plurality of connecting blocks are uniformly distributed between the upper jacket and the lower jacket, and the upper jacket and the lower jacket are fixedly connected into a whole through the connecting blocks. And threaded holes for installing the jacking bolts are formed in each connecting block.

The inner diameter of the bottom jacket is matched with the outer diameter of the tail ring matched with the bottom jacket, and the inner diameter of the top jacket is matched with the outer diameter of the throat lining ring matched with the top jacket.

One end of each connecting rod is fixed on the outer circumference of the bottom jacket or the outer circumference of the top jacket, and the other end is a cantilever end; the connecting rods are horizontal, and the included angle between the connecting rods is 120 degrees. The end face of each connecting rod cantilever end is a U-shaped slot. The position and length of each connecting rod are preferably such that the cantilever end of each connecting rod can be inserted into the long rod or the short rod, respectively.

The utility model aims to provide a welding positioning tool for a solid rocket engine shell expansion section, which aims to solve the technical problems of welding assembly gaps and misalignment of a multi-section conical shell expansion section. Compared with the prior art, the utility model has the following beneficial effects:

the welding positioning tool has the advantages that the trapezoidal plate is matched with the inner surface of the conical shell, so that the inner surface of the conical shell is supported, the roundness of the expansion section of the conical shell is corrected, the expansion section of the shell can be fastened, and the positioning and fastening effects are achieved; the assembly dislocation amount of the multi-section shell before welding is controlled by arranging the outer hoop tool assembly of the bottom jacket and the top jacket, so that the expansion section assembly can be supported and positioned, and the effect of accurate positioning is achieved; the long rod and the short rod are connected with the jacket and the base, so that the vertical positioning of the tail ring shell, the cone segment shell and the throat liner shell is ensured, the assembly gap before welding of the multi-segment shell is controlled, and the rapid positioning function of the shell is realized; the cooperation of trapezoidal plate, top clamp cover, bottom clamp cover and stock has realized the location before welding of multistage toper casing, and this process need not to carry out repeated location operation to the casing, it is even to make the casing remain the atress throughout in the welding process of location, easy to operate and assembly effect are good, very big reduction human operation error, make this and class welding location frock, provide accurate location installation for toper class work piece, the position is adjustable, the multiple model is available, work piece dimensional accuracy after effectively having guaranteed the welding, improve the work piece qualification rate, reduction in production cost.

Drawings

FIG. 1 is a schematic view of a base in a positioning fixture;

FIG. 2 is a schematic diagram of the structure of the bottom jacket in the positioning tool;

FIG. 3 is a schematic structural view of a positioning tool;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a schematic illustration of the utility model in use for welding a tail ring housing with a cone housing;

fig. 6 is a schematic illustration of the application of the present utility model in the welding of a cone segment housing to a laryngeal mask housing.

In the figure: 1. a base; 2. a long rod; 3. a short bar; 4. a top cover; 5. a bottom jacket; 6. a top jacket; 7. a chassis; 8. a trapezoidal plate; 9. a jack bolt; 10. positioning bolts; 11. a top nut; 12. a tail ring housing; 13. a cone section housing; 14. a bottom weld; 15. a top weld; 16. a laryngeal mask shell; 17. a jacket is arranged; 18. a connecting rod; 19. and (5) a jacket is arranged below.

Detailed Description

The embodiment is a fixture for assembling and welding an expansion section of a multi-section conical shell, and comprises a base 1, a trapezoid plate 8, a bottom jacket 5, a top jacket 6 and a top cover 4. The bottom jacket and the top jacket are respectively matched with the base for use.

The base 1 consists of a

chassis

7 and 3 trapezoid boards 8; each trapezoid board is inserted into the upper surface of the chassis, and the included angle between each trapezoid board is 120 degrees. Three axial long rods 2 and three axial short rods 3 are respectively fixed on the upper surface of the chassis, the top ends of the long rods are respectively fixedly connected with the cantilever ends of the connecting rods on the top jacket 6, and the top ends of the short rods are respectively fixedly connected with the cantilever ends of the connecting rods on the bottom jacket 5. The relative position between the bottom jacket 5 and the base 1 is fixed by the short rod, and the bottom jacket 5 can be prevented from moving due to thermal stress when welding the tail ring housing 12 and the cone housing 13. By fixing the relative position of the top jacket 6 and the base 1 by the long rod, it is possible to prevent the top jacket 6 from moving due to thermal stress when welding the throat liner housing 16 and the cone section housing 13. When in use, each section of the expansion section of the multi-section conical shell is sleeved on the trapezoid plate 8 respectively and is fastened through the bottom jacket 5 and the top jacket 6. A top cover 4 is mounted on the top end of the base 1 by screw threads.

The chassis 7 in the base 1 is in a circular ring shape, supporting ribs are distributed in the circular ring, and three horizontal clamping grooves for clamping the trapezoid plates are distributed on the upper surface of the supporting ribs; the included angle between each horizontal clamping groove is 120 degrees. An axial center rod is arranged at the center of the chassis; three vertical clamping grooves for clamping the trapezoid plates are uniformly distributed on the surface of the central rod; the three vertical clamping grooves are respectively in one-to-one correspondence with the three horizontal grooves. The top end surface of the central rod is a threaded surface for installing the top cover 4.

The trapezoid board in the base 1 is in a right triangle shape. The vertical edges of the trapezoid plates are respectively matched with the vertical clamping grooves on the surface of the central rod, and the horizontal edges of the trapezoid plates are respectively matched with the horizontal clamping grooves on the surface of the chassis supporting rib. The bevel edge of the trapezoid plate is three-level stepped; the three-stage stepped horizontal plane of the trapezoid plate is respectively flush with the upper surfaces of the throat lining shell 16, the cone section shell 13 and the tail ring shell 12 from top to bottom, and the inclined planes of the steps at each stage are respectively attached to the inner surface of the throat lining shell 16, the inner surface of the cone section shell 13 and the inner surface of the tail ring shell 12 from top to bottom.

The bottom jacket 5 and the top jacket 6 have the same structure and are all annular. The difference is that the inner diameter of the bottom jacket is adapted to the outer diameter of the tail ring with which it is fitted, and the inner diameter of the top jacket is adapted to the outer diameter of the throat liner ring with which it is fitted.

The bottom jacket and the top jacket are respectively composed of two annular jackets and three connecting rods 18; the jackets are divided into an upper jacket 17 and a lower jacket 19; the upper jacket and the lower jacket are axially stacked, a plurality of connecting blocks are uniformly distributed between the upper jacket and the lower jacket, and the upper jacket and the lower jacket are fixedly connected into a whole through the connecting blocks. Radial threaded holes are formed in each connecting block for mounting the jack bolts 9.

One end of each connecting rod 18 is fixed on the outer circumference of the bottom jacket 5 or the outer circumference of the top jacket 6, and the other end is a cantilever end; the connecting rods are horizontal, and the included angle between the connecting rods is 120 degrees. The end face of each connecting rod cantilever end is a U-shaped slot. The position and length of each connecting rod are preferably such that the cantilever end of each connecting rod can be inserted into the long rod or the short rod, respectively.

Fig. 5 is a schematic diagram of an application of the utility model in welding the tail ring shell and the cone segment shell, when the tail ring shell 12 and the cone segment shell 13 are assembled before welding, a plurality of positioning bolts 10 pass through threaded through holes of the bottom jacket 5, the external positioning bolts 10 of the bottom jacket 5 are rotated to radially press the outer surfaces of the expansion segments of the tail ring shell 12 and the cone segment shell 13, so as to adjust the dislocation of the inner surfaces of the tail ring shell 12 and the cone segment shell 13, and the welding gap of the bottom welding seam 14 can be ensured to reach a smaller value by screwing the tightening bolts 9 above the short rod 3.

Fig. 6 is a schematic diagram of the application of the utility model in welding the cone-section shell and the throat-section shell, when the throat-section shell 16 and the cone-section shell are assembled before welding, a plurality of positioning bolts 10 penetrate through threaded through holes of the top jacket 6, the external positioning bolts 10 of the top jacket 6 are screwed to radially press the outer surfaces of the throat-section shell 16 and the expansion section of the cone-section shell, so as to adjust the dislocation of the inner surfaces of the tail ring shell 12 and the cone-section shell 13, the top bolts 9 above the long rods 2 are screwed, the top cover 4 is tightly pressed, and the top nuts 11 are screwed, so that the welding gap of the top weld joint 15 can be ensured to reach a smaller value.

Claims

1. The positioning tool for welding the expansion section of the multi-section conical shell is characterized by comprising a base, a trapezoidal plate, a bottom jacket, a top jacket and a top cover; the bottom jacket and the top jacket are respectively matched with the base for use;

the base consists of a chassis and three trapezoid boards; each trapezoid board is inserted into the upper surface of the chassis, and the included angle between each trapezoid board is 120 degrees; three axial long rods and three axial short rods are respectively fixed on the upper surface of the chassis, the top ends of the long rods are respectively fixedly connected with the cantilever ends of the connecting rods on the top jacket, and the top ends of the short rods are respectively fixedly connected with the cantilever ends of the connecting rods on the bottom jacket; when in use, each section of the expansion section of the multi-section conical shell is sleeved on the trapezoid plate respectively and is fastened through the bottom jacket and the top jacket; the top cap is installed on the top of this base through the screw thread.

2. The positioning tool for welding the expansion section of the multi-section conical shell according to claim 1, wherein supporting ribs are distributed in a circular ring of a chassis in the base, and three horizontal clamping grooves for clamping the trapezoid plate are distributed on the upper surface of the supporting ribs; the included angle between each horizontal clamping groove is 120 degrees.

3. A positioning fixture for welding an expanded section of a multi-section conical shell as claimed in claim 1, wherein there is an axial center rod in the center of the chassis; three vertical clamping grooves for clamping the trapezoid plates are uniformly distributed on the surface of the central rod; the three vertical clamping grooves are respectively in one-to-one correspondence with the three horizontal grooves.

4. A positioning fixture for welding an expanded section of a multi-section conical shell as claimed in claim 3, wherein the trapezoidal plate in the base is in the shape of a right triangle; the vertical edges of the trapezoid plates are respectively matched with the vertical clamping grooves on the surface of the central rod, and the horizontal edges of the trapezoid plates are respectively matched with the horizontal clamping grooves on the surface of the chassis supporting rib.

5. The positioning tooling for welding the expanded section of the multi-section conical shell of claim 4, wherein the hypotenuse of said trapezoidal plate is a three-stage step; the three-stage stepped horizontal plane of the stepped plate is respectively flush with the upper surfaces of the throat lining shell, the cone section shell and the tail ring shell from top to bottom, and the inclined planes of the steps from top to bottom are respectively attached to the inner surfaces of the throat lining shell, the cone section shell and the tail ring shell from top to bottom.

6. The positioning fixture for welding an expanded section of a multi-section conical shell according to claim 1, wherein the bottom jacket and the top jacket are respectively composed of two annular jackets and three connecting rods; the jacket is divided into an upper jacket and a lower jacket; the upper jacket and the lower jacket are axially stacked, a plurality of connecting blocks are uniformly distributed between the upper jacket and the lower jacket, and the upper jacket and the lower jacket are fixedly connected into a whole through the connecting blocks; and threaded holes for installing the jacking bolts are formed in each connecting block.

7. The fixture for welding an expanded section of a multi-section conical shell according to claim 1, wherein the inner diameter of the bottom jacket is adapted to the outer diameter of the mating tail ring and the inner diameter of the top jacket is adapted to the outer diameter of the mating throat liner ring.

8. The positioning tool for welding an expanded section of a multi-section conical shell according to claim 7, wherein one end of each of said connecting rods is fixed on the outer circumference of said bottom jacket or the outer circumference of said top jacket, and the other end is a cantilever end; each connecting rod is horizontal, and the included angle between the connecting rods is 120 degrees; the end face of each connecting rod cantilever end is a U-shaped slot; the position and length of each connecting rod are preferably such that the cantilever end of each connecting rod can be inserted into the long rod or the short rod, respectively.