CN109014900B - Method for assembling flexible nozzle - Google Patents
Method for assembling flexible nozzle Download PDFInfo
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- CN109014900B CN109014900B CN201811026202.8A CN201811026202A CN109014900B CN 109014900 B CN109014900 B CN 109014900B CN 201811026202 A CN201811026202 A CN 201811026202A CN 109014900 B CN109014900 B CN 109014900B
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- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P21/00—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
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Abstract
The invention discloses an assembly method of a flexible spray pipe, wherein the flexible spray pipe comprises a flexible joint, a fixed inverted cone assembly, a diffusion section assembly, a movable inverted cone heat insulation layer, a throat lining body and a shielding cover, the assembly method utilizes a positioning screw to control the position precision of each component of the flexible spray pipe, improves the coaxiality and the verticality of an assembly surface by processing machining allowance in advance, utilizes sealing putty and adhesive to seal and fix the throat lining body, utilizes an endoscope to inspect a swinging inner cavity of the flexible spray pipe assembly before the shielding cover is assembled, and sets an independent assembly area to control the swinging inner cavity of the flexible spray pipe to have no excess, thereby solving the assembly problem of the flexible spray pipe, improving the production efficiency and ensuring the assembly precision and the quality of the flexible spray pipe; in addition, the flexible nozzle assembled by the assembly method provided by the invention is subjected to ground test and flight test examination for many times, and the product quality completely meets the design requirement.
Description
Technical Field
The invention belongs to the technical field of flexible jet pipes of engines, and particularly relates to an assembly method of a flexible jet pipe.
Background
The jet pipe is an important structural part of the rocket engine, is positioned at the tail part of the rocket engine, is an outlet of high-temperature and high-pressure fuel gas in a combustion chamber, is an important part for energy conversion of the rocket engine, and directly influences the performance of the rocket engine. The flexible spray pipe is a complex spray pipe which has a full-axis swing function and can be subjected to vector control through swing. As shown in figure 1, the flexible nozzle mainly comprises a flexible joint 1, a fixed inverted cone assembly 2, a diffusion section assembly 3, a movable inverted cone heat insulation layer 4, a throat lining body 5, a shielding cover 6 and other parts.
The assembly position precision of each component of the flexible spray pipe is high, the structure is stable, the sealing performance is good, and the swinging inner cavity has no redundant substance, which is the premise that the flexible spray pipe normally works, so that the assembly quality of the flexible spray pipe is improved, and the normal work of the flexible spray pipe can be ensured. The prior assembly technology mainly has the following defects:
1) the flexible joint 1, the fixed inverted cone component 2 and the diffusion section component 3 are assembled and fixed through screws, and the radial and circumferential position accuracy of each component after assembly cannot be guaranteed because a large gap exists between each screw and each through hole and no positioning exists in the circumferential direction and the radial direction of each component during assembly;
2) the flexible joint 1, the fixed inverted cone component 2, the diffusion section component 3 and the movable inverted cone heat-insulating layer 4 are assembled to form a flexible spray pipe component, all the components forming the flexible spray pipe component are assembled and fixed in a screw fixing or bonding mode, and due to the accumulation of assembly errors, the coaxiality of inner holes and the end face verticality of all the components after assembly are poor, so that the assembly gap between the flexible spray pipe component and the throat lining body is uneven, and the assembly of the throat lining body and the flexible spray pipe component is difficult;
3) the flexible joint 1, the fixed inverted cone component 2 and the diffusion section component 3 form a swinging inner cavity after being assembled, the outside is protected by a shielding cover 6, and the excess materials are prevented from entering the swinging inner cavity of the flexible spray pipe; according to the method, the swinging inner cavity of the flexible spray pipe can be prevented from entering the surplus materials after the flexible spray pipe is assembled, but the swinging inner cavity of the flexible spray pipe cannot be prevented from entering the surplus materials in the assembling process, so that hidden dangers exist in normal operation of the spray pipe.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an assembly method of a flexible spray pipe, which can improve the assembly precision of each part and ensure the normal work of the flexible spray pipe.
In order to achieve the purpose, the invention provides an assembly method of a flexible spray pipe, wherein the flexible spray pipe comprises a flexible joint, a fixed inverted cone assembly, a diffusion section assembly, a movable inverted cone heat insulation layer, a throat lining body and a shielding cover, and the assembly method of the flexible spray pipe comprises the following steps:
1) machining assembly surface allowance
The allowance is reserved between the movable inverted cone shell of the flexible joint and the A surface assembled with the throat liner body in the machining process; the movable inverted cone heat insulation layer is reserved with an assembly B surface, an assembly C surface, an assembly D surface, an assembly E surface, an assembly F surface and an assembly G surface of the throat lining body in the machining process;
2) assembly of flexible joint and fixed inverted cone component
In the assembly process of the fixed rear joint and the fixed inverted cone assembly of the flexible joint, at least two first positioning screws are firstly installed to circumferentially and radially position the fixed rear joint and the fixed inverted cone assembly of the flexible joint; after all the first positioning screws are positioned, mounting assembly screws of other hole sites between the fixed rear connector of the flexible connector and the fixed inverted cone assembly; after the assembly screws of the rest hole sites are installed, all the first positioning screws are disassembled, and the assembly screws are installed at all the hole sites where the first positioning screws are installed;
3) assembly of flexible joint and diffuser section assembly
In the assembling process of the movable inverted cone shell and the diffusion section assembly of the flexible joint, at least two second positioning screws are installed to perform circumferential and radial positioning on the movable inverted cone shell and the diffusion section assembly of the flexible joint; after all the second positioning screws are positioned, mounting assembly screws of other hole sites between the movable inverted cone shell of the flexible joint and the diffusion section assembly; after the assembly screws of the rest hole sites are installed, all the second positioning screws are disassembled, and the assembly screws are installed at all the hole sites where the second positioning screws are installed, so that the assembly of the flexible spray pipe assembly is completed;
4) turning allowance
After the flexible spray pipe assembly is assembled, the jump of the surface M and the surface N of the inner hole of the alignment diffuser section assembly is not more than 0.02mm, and the surface A, the surface B, the surface C, the surface D, the surface E, the surface F and the surface G in the step 1) are turned to the final size;
5) throat liner and flexible nozzle assembly
Before the throat lining body is pressed into the flexible spray pipe assembly, smearing organic silicon adhesive in an inner hole M surface of the diffusion section assembly, and smearing D03 putty on an assembly A surface, an assembly B surface, an assembly C surface, an assembly D surface, an assembly E surface, an assembly F surface and an assembly G surface respectively for filling and sealing;
6) flexible spray pipe formed by installing shielding cover
And assembling the shielding cover and the flexible spray pipe assembly to form the flexible spray pipe.
Further, in the step 2), all the first positioning screws are symmetrically distributed along the central axis of the flexible joint; the first head thread of each first positioning screw is assembled and positioned with the fixed rear joint threaded hole of the flexible joint, and the first tail cylindrical section of each first positioning screw is assembled and positioned with the first through hole of the fixed inverted cone assembly; and the outer diameter of the first head part thread of each first positioning screw is the same as the inner diameter of the fixed rear joint threaded hole of the flexible joint, and the outer diameter of the first tail part cylindrical section of each first positioning screw is the same as the inner diameter of the first through hole of the fixed inverted cone assembly.
Further, in the step 3), all the second positioning screws are symmetrically distributed along the central axis of the flexible joint; a second head thread of each second positioning screw is assembled and positioned with a threaded hole of a movable inverted cone shell of the flexible joint, and a second tail cylindrical section of each second positioning screw is assembled and positioned with a second through hole of the diffuser section assembly; and the outer diameter of the second head thread of each second positioning screw is the same as the inner diameter of the threaded hole of the movable inverted cone shell of the flexible joint, and the outer diameter of the second tail cylindrical section of each second positioning screw is the same as the inner diameter of the second through hole of the diffuser section assembly.
Further, in the step 1), a margin of 0.1-0.3 mm is reserved for the assembly surface A; and the allowance of 0.1-0.3 mm is reserved for the assembly B surface, the assembly C surface, the assembly D surface, the assembly E surface, the assembly F surface and the assembly G surface, and the assembly B surface, the assembly D surface and the assembly F surface are unilateral bridge gaps.
Further, in the step 2), the tolerance of the first through hole for fixing the inverted cone assembly is +/-0.03 mm; in the step 3), the tolerance of the second through hole of the diffusion section assembly is +/-0.03 mm.
Further, in the step 5), the organic silicon adhesive is a D-series single-part room temperature curing organic silicon adhesive.
Further, in the step 6), before the shielding cover is assembled, the swinging inner cavity of the flexible spray pipe assembly is inspected by using an endoscope, and the swinging inner cavity is cleaned by using a dust collector; then, a shielding cover assembling operation area is independently set, the shielding cover and the flexible spray pipe assembly are assembled to form a flexible spray pipe, and the assembling parts and the operation tools are counted and recorded before and after the shielding cover is assembled.
Compared with the prior art, the invention has the following advantages: according to the assembly method, the position accuracy of each part of the flexible spray pipe is controlled by using the positioning screws, the coaxiality and the verticality of an assembly surface are improved by processing machining allowance in advance, the throat lining body is sealed and fixed by using sealing putty and adhesive, the swinging inner cavity of the flexible spray pipe assembly is inspected by using an endoscope before the assembly of the shielding cover, and an independent assembly area is set to control the swinging inner cavity of the flexible spray pipe to have no excess, so that the assembly problem of the flexible spray pipe is solved, the production efficiency is improved, and the assembly accuracy and the assembly quality of the flexible spray pipe are ensured; in addition, the flexible nozzle assembled by the assembly method provided by the invention is subjected to ground test and flight test examination for many times, and the product quality completely meets the design requirement.
Drawings
FIG. 1 is a schematic view of a flexible nozzle structure;
FIG. 2 is a schematic view of the assembly structure of the flexible joint and the fixed inverted cone assembly of the present invention;
fig. 3 is a schematic structural view of a first positioning screw according to the present invention.
FIG. 4 is a schematic view of the assembled structure of the flexible joint and diffuser section assembly of the present invention;
FIG. 5 is a schematic view of a second set screw according to the present invention;
FIG. 6 is a schematic view of the mounting surface of the flexible spout assembly of the present invention.
The components in the figures are numbered as follows:
the flexible joint comprises a flexible joint 1 (wherein a fixed rear joint 1a and a movable inverted cone shell 1b), a fixed inverted cone component 2, a diffusion section component 3, a movable inverted cone heat insulation layer 4, a throat lining body 5, a shielding cover 6, an assembly screw 7, a second positioning screw 8 (wherein a second head thread 8a and a second tail cylindrical section 8b), a swing inner cavity 9 and a first positioning screw 10 (wherein a first head thread 10a and a first tail cylindrical section 10 b).
Detailed Description
The invention will be more clearly understood from the following detailed description of the invention taken in conjunction with the accompanying drawings and specific examples, which are not to be construed as limiting the invention.
As shown in figure 1, the flexible nozzle comprises a flexible joint 1, a fixed inverted cone component 2, a diffusion section component 3, a movable inverted cone heat insulation layer 4, a throat lining body 5 and a shielding cover 6, and the assembling method of the flexible nozzle comprises the following steps:
1) machining assembly surface allowance
After the movable inverted cone shell 1b of the flexible joint 1 and the diffusion section assembly 3 are assembled and fixed through the assembling screws, the movable inverted cone heat-insulating layer 4 is bonded on the movable inverted cone shell 1b of the flexible joint 1, and due to the accumulation of assembling errors, the coaxiality of inner holes and the end face verticality are poor after the flexible joint 1, the diffusion section assembly 3 and the movable inverted cone heat-insulating layer 4 are assembled; in order to improve the coaxiality of the inner holes of the assembly surface of the flexible spray pipe assembly and the throat lining body and the perpendicularity of the end surfaces, the allowance of 0.1-0.3 mm (preferably 0.2mm) is reserved between the movable inverted cone shell 1b of the flexible joint 1 and the assembly surface A of the throat lining body 5 in the processing process; in the processing process of the movable inverted cone heat insulation layer 4, allowance of 0.1-0.3 mm (preferably 0.2mm) is reserved for an assembly B surface, an assembly C surface, an assembly D surface, an assembly E surface, an assembly F surface and an assembly G surface of the throat lining body 5, and unilateral bridge gaps are reserved for the assembly B surface, the assembly D surface and the assembly F surface;
2) assembly of flexible joint 1 and fixed inverted cone component 2
In the assembly process of the fixed rear joint 1a of the flexible joint 1 and the fixed inverted cone component 2, as shown in fig. 2, firstly, two first positioning screws 10 are installed to perform circumferential and radial positioning on the fixed rear joint 1a of the flexible joint 1 and the fixed inverted cone component 2 (namely, after the two first positioning screws 10 are assembled, the flexible joint 1 and the fixed inverted cone component 2 are fixed and cannot move in the circumferential and radial directions), and the two first positioning screws 10 are symmetrically distributed along the central axis of the flexible joint 1; after the two first positioning screws 10 are positioned, assembling screws 7 of other hole positions between the fixed rear connector 1a of the flexible connector 1 and the fixed inverted cone component 2 are installed; after the assembly screws 7 at the rest hole sites are installed, the two first positioning screws 10 are disassembled, the assembly screws 7 are installed at the two hole sites where the first positioning screws 10 are installed, and the assembly and the positioning of the fixed rear connector 1a of the flexible connector 1 and the fixed inverted cone assembly 2 are completed;
referring to fig. 3, the first head thread 10a of the first positioning screw 10 is assembled and positioned with the threaded hole of the fixed rear joint 1a of the flexible joint 1, and the first tail cylindrical section 10b of the first positioning screw 10 is assembled and positioned with the first through hole of the fixed inverted cone assembly 2; moreover, the outer diameter of the first head thread 10a of the first positioning screw 10 is the same as the inner diameter of the threaded hole of the fixed rear joint 1a of the flexible joint 1, and the outer diameter of the first tail cylindrical section 10b of the first positioning screw 10 is the same as the inner diameter of the first through hole of the fixed inverted cone component 2;
in order to further improve the assembly precision, the tolerance of the first through hole for fixing the inverted cone component 2 is +/-0.03 mm;
3) assembly of a flexible joint 1 with a diffuser assembly 3
In the assembly process of the movable inverted cone shell 1b and the diffusion section assembly 3 of the flexible joint 1, as shown in fig. 4, two second positioning screws 8 are firstly installed to perform circumferential and radial positioning on the movable inverted cone shell 1b and the diffusion section assembly 3 of the flexible joint 1 (namely, after the two second positioning screws 8 are assembled, the flexible joint 1 and the diffusion section assembly 3 are fixed and cannot move in the circumferential and radial directions), and the two second positioning screws 8 are symmetrically distributed along the central axis of the flexible joint 1; after the two second positioning screws 8 are positioned, assembling screws 7 of other hole positions between the movable inverted cone shell 1b of the flexible joint 1 and the diffusion section assembly 3 are installed; after the assembly screws 7 at the rest hole sites are installed, the two second positioning screws 8 are disassembled, the assembly screws 7 are installed at the two hole sites where the second positioning screws 8 are installed, the assembly and the positioning of the movable inverted cone shell 1b of the flexible joint 1 and the diffusion section component 3 are completed, and the assembly of the flexible spray pipe component is completed;
referring to fig. 5, the second head thread 8a of the second positioning screw 8 is assembled and positioned with the threaded hole of the diffuser section assembly 3, and the second tail cylindrical section 8b of the second positioning screw 8 is assembled and positioned with the second through hole of the movable inverted cone shell 1b of the flexible joint 1; the outer diameter of a second head thread 8a of the second positioning screw 8 is the same as the inner diameter of a threaded hole of the diffuser section assembly 3, and the outer diameter of a second tail cylindrical section 8b of the second positioning screw 8 is the same as the inner diameter of a second through hole of the movable inverted cone shell 1b of the flexible joint 1;
in order to further improve the assembly precision, the tolerance of the second through hole of the diffusion section component 3 is +/-0.03 mm;
4) turning allowance
After the flexible spray pipe assembly is assembled, the jump of the M surface of the inner hole and the N surface of the end surface of the 3-dimensional alignment diffuser assembly is not more than 0.02mm, and the A surface, the B surface, the C surface, the D surface, the E surface, the F surface and the G surface of the assembly in the step 1) are turned to the final size, so that the coaxiality of the inner hole and the verticality of the end surface of the whole assembly surface are improved, and the method is combined with the method shown in FIG. 6;
5) the throat insert 5 is assembled with the flexible nozzle assembly
Because the clearance between the throat lining body 5 and each matching surface of the flexible spray pipe assembly is generally 0.05-0.15 mm, in order to ensure the sealing type of the spray pipe, before the throat lining body 5 is pressed into the flexible spray pipe assembly, a D series single-part room temperature curing organic silicon adhesive is coated in an inner hole M surface of the diffusion section assembly 3, D03 putty is respectively coated on an assembly A surface, an assembly B surface, an assembly C surface, an assembly D surface, an assembly E surface, an assembly F surface and an assembly G surface for filling and sealing, and the structure is combined with the structure shown in figure 6;
although the D03 putty has good sealing performance, the adhesive force is poor, and in order to ensure the assembly strength of the throat lining body and the flexible spray pipe assembly, a D series single-part room temperature curing organic silicon adhesive is coated on the M surface of the inner hole of the diffusion section assembly 3 for adhesive fixation, so that the assembly sealing performance is ensured, and the assembly strength is also ensured;
6) the flexible spray pipe is formed by installing the shielding cover 6
Before the shielding cover 6 is assembled, the swinging inner cavity 9 of the flexible spray pipe component is inspected by using an endoscope, and the swinging inner cavity 9 is cleaned by using a dust collector, so that the swinging inner cavity 9 is ensured to have no redundant substances; the shielding cover 6 is independently arranged to assemble an operation area, the shielding cover 6 and the flexible spray pipe assembly are assembled to form the flexible spray pipe, all assembling parts and operation tools are checked and recorded before and after the shielding cover 6 is assembled, the shielding cover 6 is ensured to be free of lost parts in the whole assembling process and fall into the swing inner cavity 9 of the flexible spray pipe 1, and therefore the purpose of controlling the redundant parts in the swing inner cavity 9 of the flexible spray pipe assembly is achieved.
The assembly method of the invention improves the coaxiality and the verticality of the assembly surface by controlling the position precision of each part of the flexible spray pipe by using the positioning screw, processing the machining allowance in advance, sealing and fixing the throat lining body by using the sealing putty and the adhesive, checking the swing inner cavity 9 of the flexible spray pipe assembly by using the endoscope before the assembly of the shielding cover 6 and setting an independent assembly area to control the swing inner cavity of the flexible spray pipe to have no excess, solves the assembly problem of the flexible spray pipe, improves the production efficiency and ensures the assembly precision and the quality of the flexible spray pipe.
The assembling method of the present invention will be explained in further detail with reference to specific examples
Examples
1) Machining assembly surface allowance
A margin of 0.2mm is reserved on the surface A assembled with the throat lining body 5 in the process of processing the movable inverted cone shell 1b of the flexible joint 1; in the process of processing the movable inverted cone heat insulation layer 4, allowance of 0.2mm is reserved for an assembly B surface, an assembly C surface, an assembly D surface, an assembly E surface, an assembly F surface and an assembly G surface of the throat lining body 5, and the assembly B surface, the assembly D surface and the assembly F surface are all single-side bridge gaps;
2) assembly of flexible joint 1 and fixed inverted cone component 2
In the assembly process of the fixed rear joint 1a of the flexible joint 1 and the fixed inverted cone component 2, firstly, two first positioning screws 10 are installed to perform circumferential and radial positioning on the fixed rear joint 1a of the flexible joint 1 and the fixed inverted cone component 2, and the two first positioning screws 10 are symmetrically distributed along the central axis of the flexible joint 1; after the two first positioning screws 10 are positioned, mounting M6 assembly screws of other hole positions between the fixed rear connector 1a of the flexible connector 1 and the fixed inverted cone assembly 2; after the M6 assembly screws of the rest hole sites are installed, the two first positioning screws 10 are disassembled, M6 assembly screws are installed at the two hole sites where the first positioning screws 10 are installed, and the assembly and the positioning of the fixed rear connector 1a of the flexible connector 1 and the fixed inverted cone assembly 2 are completed;
the first head M6 screw thread of the first positioning screw 10 is assembled with the screw hole M6 screw hole of the fixed rear joint M6 of the flexible joint 1First end of the first set screw 10
(-0.04/-0.08) cylindrical section and first fixed inverted cone assembly 2
Assembling and positioning the through hole; and fixing the first of the reverse taper body assembly 2
Through hole button
Carrying out tightening control processing;
3) assembly of a flexible joint 1 with a diffuser assembly 3
In the assembling process of the movable inverted cone shell 1b and the diffusion section assembly 3 of the flexible joint 1, firstly, two second positioning screws 8 are installed to perform circumferential and radial positioning on the movable inverted cone shell 1b and the diffusion section assembly 3 of the flexible joint 1, and the two second positioning screws 8 are symmetrically distributed along the central axis of the flexible joint 1; after the two second positioning screws 8 are positioned, M6 assembling screws of other hole positions between the movable inverted cone shell 1b of the flexible joint 1 and the diffusion section assembly 3 are installed; after the M6 assembly screws of the rest hole sites are installed, the two second positioning screws 8 are disassembled, M6 assembly screws are installed at the two hole sites where the second positioning screws 8 are installed, the assembly and the positioning of the movable inverted cone shell 1b of the flexible joint 1 and the diffusion section component 3 are completed, and the assembly of the flexible spray pipe component is completed;
the second head M6 thread of the second positioning screw 8 is assembled and positioned with the threaded hole M6 of the movable inverted cone shell of the flexible joint 1, and the second tail of the second positioning screw 8
(-0.04/-0.08) second of the cylindrical segment and diffuser assembly 3
The through hole is assembled and positioned(ii) a And a second of the diffuser section assembly 3
Through hole button
Carrying out tightening control processing;
4) turning allowance
After the flexible spray pipe assembly is assembled, the jump of the M surface of the inner hole and the N surface of the end surface of the 3-dimensional alignment diffuser assembly is not more than 0.02mm, and the A surface, the B surface, the C surface, the D surface, the E surface, the F surface and the G surface of the assembly in the step 1) are turned to the final size, so that the coaxiality of the inner hole and the verticality of the end surface of the whole assembly surface are improved;
5) the throat insert 5 is assembled with the flexible nozzle assembly
Gaps between the throat lining body 5 and the matching surfaces of the flexible spray pipe assembly are 0.05-0.15 mm, before the throat lining body 5 is pressed into the flexible spray pipe assembly, a D series single room temperature curing organic silicon adhesive is coated in an inner hole M surface of a diffusion section assembly 3, and D03 putty is respectively coated on an assembly A surface, an assembly B surface, an assembly C surface, an assembly D surface, an assembly E surface, an assembly F surface and an assembly G surface for filling and sealing;
6) the flexible spray pipe is formed by installing the shielding cover 6
Before the shielding cover 6 is assembled, the swinging inner cavity 9 of the flexible spray pipe 1 is inspected by using an endoscope, and the swinging inner cavity 9 is cleaned by using a dust collector, so that the swinging inner cavity 9 is ensured to have no redundant substances; the shielding cover 6 assembling operation area is independently set, the shielding cover 6 and the flexible spray pipe 1 are assembled to form the flexible spray pipe, and the assembling parts and the operation tools are checked and recorded before and after the shielding cover 6 is assembled, so that the shielding cover 6 is ensured to have no lost parts falling into the swing inner cavity 9 of the flexible spray pipe 1 in the whole assembling process, and the aim of controlling the redundant parts in the swing inner cavity 9 of the flexible spray pipe 1 is fulfilled.
Comparative example
Assembly process of conventional flexible nozzle
1) The flexible joint 1 and the fixed inverted cone component 2 are directly fixed by using an M6 screw;
2) the flexible joint 1 and the diffuser segment assembly 3 are directly fixed by using M6 screws;
3) the flexible joint 1, the fixed inverted cone component 2, the diffusion section component 3 and the movable inverted cone heat-insulating layer 4 are machined to the final size, then the components are assembled, and the subsequent assembly is carried out after the assembly is finished;
4) assembling the throat lining body 5 and the flexible spray pipe assembly, smearing D series single-part room temperature curing organic silicon adhesive/sealant D03 putty on each assembling surface for filling and sealing, and smearing adhesive on the M surface of one assembling surface of the throat lining body 5 and the diffusion section assembly 3 for adhesive fixation;
5) after the components of the flexible spray pipe are assembled, the outside of the flexible spray pipe is protected by a shielding cover 6, and the excess materials are prevented from entering the swing inner cavity of the flexible spray pipe.
All the above-mentioned large units of all the dimensions are in mm (millimeters).
The examples compare with the comparative examples:
1. the first positioning screw is added for positioning, the influence of assembling deviation of a phi 7 through hole and an M6 thread is eliminated, the coaxiality of the flexible joint and the fixed inverted cone assembly is controlled, the coaxiality of the two parts in the embodiment can be controlled within phi 0.2, and the coaxiality deviation of the two parts in the comparative example can reach phi 0.5 to the maximum extent;
2. the second positioning screw is added, so that the influence of assembling deviation of a phi 7 through hole and an M6 thread is eliminated, the coaxiality of the flexible joint and the diffuser section assembly is controlled, the coaxiality of the two parts in the embodiment can be controlled within phi 0.2, and the coaxiality deviation of the two parts in the comparative example can reach phi 0.5 to the maximum extent;
3. in the embodiment, the processing of the assembly surface is added after the flexible joint, the fixed inverted cone assembly, the diffusion section assembly and the movable inverted cone heat insulation layer are assembled, the coaxiality and the verticality of the throat lining body assembly surface can be ensured, the press fit of the throat lining body is facilitated, the gap between the throat lining body and the flexible spray pipe assembly is uniform, the assembly of the throat lining body is free from problems, and the design requirement is met; in the comparative example, due to the influence of the coaxiality difference of all assembling parts, the throat insert body is difficult to assemble in place, and the gap value required by the non-renting design cannot be realized;
4. in the comparative example, the assembly of the shielding cover is not determined as a key process, and only the swinging inner cavity of the flexible spray pipe can be prevented from entering the surplus objects, but the swinging inner cavity of the flexible spray pipe cannot be prevented from entering the surplus objects in the assembly process; in the embodiment, the process control of assembling the shielding cover is enhanced, and no redundant substance is left in the inner cavity of the flexible spray pipe after the shielding cover is assembled, so that the normal work of the flexible spray pipe is ensured.
Claims (3)
1. The flexible spray pipe assembly method comprises a flexible joint (1), a fixed inverted cone assembly (2), a diffusion section assembly (3), a movable inverted cone heat insulation layer (4), a throat lining body (5) and a shielding cover (6), and is characterized in that: the assembling method of the flexible spray pipe comprises the following steps:
1) machining assembly surface allowance
Allowance is reserved between the movable inverted cone shell (1b) of the flexible joint (1) and the assembly A surface of the throat lining body (5) in the processing process; the movable inverted cone heat insulation layer (4) is reserved with an assembly B surface, an assembly C surface, an assembly D surface, an assembly E surface, an assembly F surface and an assembly G surface of the throat lining body (5) in the machining process; reserving a margin of 0.1-0.3 mm on the surface A to be assembled; reserving margins of 0.1-0.3 mm for an assembly B surface, an assembly C surface, an assembly D surface, an assembly E surface, an assembly F surface and an assembly G surface, wherein the assembly B surface, the assembly D surface and the assembly F surface are unilateral bridge gaps;
2) the flexible joint (1) is assembled with the fixed inverted cone component (2)
In the assembly process of a fixed rear connector (1a) and a fixed inverted cone assembly (2) of a flexible connector (1), at least two first positioning screws (10) are installed to perform circumferential and radial positioning on the fixed rear connector (1a) and the fixed inverted cone assembly (2) of the flexible connector (1); after all the first positioning screws (10) are positioned, mounting assembly screws (7) of the rest hole positions between the fixed rear connector (1a) of the flexible connector (1) and the fixed inverted cone assembly (2); after the assembly screws (7) at the rest hole sites are installed, all the first positioning screws (10) are disassembled, and the assembly screws (7) are installed at all the hole sites where the first positioning screws (10) are installed;
all the first positioning screws (10) are symmetrically distributed along the central axis of the flexible joint (1); a first head thread (10a) of each first positioning screw (10) is assembled and positioned with a threaded hole of a fixed rear joint (1a) of the flexible joint (1), and a first tail cylindrical section (10b) of each first positioning screw (10) is assembled and positioned with a first through hole of the fixed inverted cone component (2); the outer diameter of a first head thread (10a) of each first positioning screw (10) is the same as the inner diameter of a threaded hole of a fixed rear joint (1a) of the flexible joint (1), and the outer diameter of a first tail cylindrical section (10b) of each first positioning screw (10) is the same as the inner diameter of a first through hole of the fixed inverted cone assembly (2);
3) assembling the flexible joint (1) with the diffuser section assembly (3)
In the assembling process of the movable inverted cone shell (1b) and the diffusion section assembly (3) of the flexible joint (1), at least two second positioning screws (8) are installed to perform circumferential and radial positioning on the movable inverted cone shell (1b) and the diffusion section assembly (3) of the flexible joint (1); after all the second positioning screws (8) are positioned, mounting assembly screws (7) of the rest hole positions between the movable inverted cone shell (1b) of the flexible joint (1) and the diffusion section assembly (3); after the assembly screws (7) at the rest hole sites are installed, all the second positioning screws (8) are disassembled, and the assembly screws (7) are installed at all the hole sites where the second positioning screws (8) are installed, so that the assembly of the flexible spray pipe assembly is completed;
all the second positioning screws (8) are symmetrically distributed along the central axis of the flexible joint (1); a second head thread (8a) of each second positioning screw (8) is assembled and positioned with a threaded hole of the diffuser section assembly (3), and a second tail cylindrical section (8b) of each second positioning screw (8) is assembled and positioned with a second through hole of a movable inverted cone shell (1b) of the flexible joint (1); the outer diameter of a second head thread (8a) of each second positioning screw (8) is the same as the inner diameter of a threaded hole of the diffuser section assembly (3), and the outer diameter of a second tail cylindrical section (8b) of each second positioning screw (8) is the same as the inner diameter of a second through hole of a movable inverted cone shell (1b) of the flexible joint (1);
4) turning allowance
After the flexible spray pipe assembly is assembled, the jump of the M surface of an inner hole and the N surface of an end surface of the diffusion section assembly (3) is aligned to be not more than 0.02mm, and the A surface, the B surface, the C surface, the D surface, the E surface, the F surface and the G surface in the step 1) are turned to the final size;
5) the throat lining (5) is assembled with the flexible nozzle assembly
Before the throat lining body (5) is pressed into the flexible spray pipe assembly, smearing organic silicon adhesive in an inner hole M surface of the diffusion section assembly (3), and smearing D03 putty on an assembly A surface, an assembly B surface, an assembly C surface, an assembly D surface, an assembly E surface, an assembly F surface and an assembly G surface respectively for filling and sealing;
6) a flexible spray pipe is formed by installing a shielding cover (6)
Assembling the shielding cover (6) and the flexible spray pipe assembly to form a flexible spray pipe; before the shielding cover (6) is assembled, an endoscope is used for inspecting a swinging inner cavity (9) of the flexible spray pipe assembly, and a dust collector is used for cleaning the swinging inner cavity (9); then, an assembling operation area of the shielding cover (6) is independently set, the shielding cover (6) and the flexible spray pipe assembly are assembled to form the flexible spray pipe, and all assembling parts and operation tools are counted and recorded before and after the shielding cover (6) is assembled.
2. The method of assembling a flexible spout of claim 1, wherein: in the step 2), the tolerance of the first through hole for fixing the inverted cone component (2) is +/-0.03 mm; in the step 3), the tolerance of the second through hole of the diffusion section assembly (3) is +/-0.03 mm.
3. The method of assembling a flexible spout of claim 1, wherein: in the step 5), the organic silicon adhesive is a D-series single-part room-temperature curing organic silicon adhesive.
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| CN113074062B (en) * | 2021-04-01 | 2022-04-29 | 湖北航天技术研究院总体设计所 | Wide-temperature-range flexible joint and flexible spray pipe |
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| CN101357430A (en) * | 2007-07-30 | 2009-02-04 | 湖北省风机厂有限公司 | Processing method of multi-level small-flow blower coaxiality |
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| CN106287101B (en) * | 2016-08-30 | 2018-05-22 | 湖北三江航天江北机械工程有限公司 | The adhering method and sealing frock of solid rocket motor nozzle and flexible blanking cover |
| CN107322246B (en) * | 2017-08-23 | 2019-05-14 | 湖北三江航天江北机械工程有限公司 | The big jet pipe of solid propellant rocket is bonded press-fitting technique |
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