Assembly tooling and assembly method for assembling lugs and diffuser housings

Abstract

This invention discloses an assembly fixture and method for assembling a support lug and a diffuser housing. The fixture includes an indexing head mounted on the worktable of a CNC radial drilling machine. A base plate is provided on the upper surface of the indexing head, and the base plate is parallel to the upper surface of the indexing head chuck. At least two openings are drilled around the perimeter of the base plate, with adjacent openings forming a 90° angle. A diffuser housing is assembled on the upper surface of the base plate, with the large-diameter end face of the diffuser housing fitting against the upper surface of the base plate. The upper surface of the chuck is rotated to an inclined state, ensuring that the upper conical surface of the diffuser housing containing one of the openings is horizontally positioned below the drill bit after assembly. A parallel clamping plate for fixing the support lug is fitted at the junction between the horizontally positioned upper conical surface of the diffuser housing and the opening. The support lug is assembled by drilling points and holes using the drill bit. This invention effectively improves assembly efficiency and ensures the assembly accuracy of the diffuser housing and the support lug.

Description

Technical Field

[0001] This invention relates to the field of processing and manufacturing technology of rocket engine oscillating nozzles, specifically to an assembly tooling and assembly method for assembling lugs and diffuser shells. Background Technology

[0002] The nozzle, as a crucial component of a solid rocket motor, is a vital part of energy conversion. The flexible oscillating nozzle is currently the most widely used type of oscillating nozzle worldwide. It connects the fixed and moving parts of the nozzle via flexible joints, featuring high structural reliability, light weight, stable oscillation performance, and fast response speed. The diffuser shell, serving as the supporting structure of the flexible oscillating nozzle, primarily functions to connect all parts into a unified whole.

[0003] The diffuser housing cone needs to be assembled with two lugs, serving as the fulcrum for the entire nozzle servo actuator. The assembly between the two lugs and the diffuser housing requires 16 screws and 4 locating pins, and the connection must be precisely fitted. The fitting accuracy at the connection between the diffuser housing and the lugs affects the assembly accuracy of the lugs, and consequently, the actuation accuracy of the nozzle servo actuator.

[0004] In the prior art, the assembly holes between the diffuser shell and the lugs are usually machined using a conventional radial drilling machine. However, each of the 16 holes needs to be manually positioned and drilled using a conventional drilling machine, which takes a long time and the production efficiency of manual control is not high, which is not conducive to widespread application. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes an assembly fixture and method for assembling the lugs and the diffuser housing. The assembly fixture assists in the positioning, marking, and drilling of the lugs, enabling rapid processing and assembly, shortening assembly time, improving work efficiency, and facilitating widespread application.

[0006] To achieve the above objectives, the present invention designs an assembly fixture for assembling a support lug and a diffuser housing, including a CNC radial drilling machine. A CNC radial drill is provided on the worktable of the CNC radial drilling machine, and a drill bit extending vertically downward is provided on the CNC radial drill. The special feature is that: an indexing head is also provided on the worktable of the CNC radial drilling machine, located below the drill bit. A chuck capable of adjusting the rotation angle is provided on the upper surface of the indexing head. A base is provided at the center of the upper surface of the chuck, and a base plate located below the drill bit is fixedly supported on the base. The base plate is parallel to the upper surface of the chuck.

[0007] At least two openings are drilled around the perimeter of the base plate, and the adjacent openings form a 90° angle. A diffuser shell is assembled on the upper surface of the base plate, and the large-diameter end face of the diffuser shell fits against the upper surface of the base plate. The upper surface of the chuck is rotated to an inclined state to ensure that the upper conical surface of the diffuser shell where one of the openings is located is in a horizontal arrangement below the drill bit.

[0008] The diffuser shell has a shell edge extending outward from its large-diameter edge, and the shell edge extends to the opening position. The diffuser shell surface is also provided with a shell flange arranged parallel to the shell edge, and the shell edge and the shell flange form a shell groove.

[0009] One of the openings has a first lug or a second lug fitted inside a groove in the horizontal housing. A parallel clamp is provided on the outside of the first lug or the second lug to fix the first lug or the second lug, and the parallel clamp passes through the corresponding opening.

[0010] The first lug or the second lug is located directly below the drill bit. The drill bit is used to make dots or holes on the bottom plate of the first lug or the second lug to complete the assembly of the first lug or the second lug with the diffuser shell.

[0011] Furthermore, the parallel clamping plate includes a U-shaped clamping frame. The inner side of the right end of the U-shaped clamping frame is in contact with the right end face of the first lug or the second lug. The inner side of the left end of the U-shaped clamping frame is in contact with the outer side of the shell edge. A threaded hole is drilled at the left end of the U-shaped clamping frame to abut against the shell edge. A tightening screw is provided in the threaded hole. By tightening the tightening screw, the first lug or the second lug is fixed together with the shell edge.

[0012] Furthermore, the first lug includes a first pin hole and / or a first threaded bottom hole located on the base plate; the first pin hole is used to form a positioning guide with the drill bit, and a first pin is installed in the first pin hole to assemble the first lug and the diffuser shell together; the first threaded bottom hole is used to form a positioning guide with the drill bit, and a first screw is installed in the first threaded bottom hole to assemble the first lug and the diffuser shell together.

[0013] The second lug includes a second pin hole and / or a second threaded bottom hole located on the base plate; the second pin hole is used to form a positioning guide with the drill bit, and a second pin is installed in the second pin hole to assemble the second lug and the diffuser shell into one piece; the second threaded bottom hole is used to form a positioning guide with the drill bit, and a second screw is installed in the second threaded bottom hole to assemble the second lug and the diffuser shell into one piece.

[0014] Furthermore, each end of the first ear base plate is provided with a first pin hole, and each end of the first ear base plate is provided with four first threaded bottom holes, which are arranged in a grid pattern; each end of the second ear base plate is provided with a second pin hole, and each end of the second ear base plate is provided with four second threaded bottom holes, which are arranged in a grid pattern.

[0015] Furthermore, the lower end face of the base plate is provided with a positioning step groove that matches the upper end face of the base. The upper end face of the base is embedded in the base plate through the positioning step groove, thereby completing the positioning of the base plate. Several tie rods for fixing the base plate are also connected between the chuck and the base plate.

[0016] Furthermore, each of the aforementioned pull rods is T-shaped, with the upper end of the T-shaped part locked onto the upper surface of the base plate and the lower end of the T-shaped part embedded in the upper part of the base.

[0017] Furthermore, multiple of the aforementioned tie rods are arranged around the perimeter of the base plate.

[0018] Furthermore, the upper surface of the base plate is provided with a boss that matches the large-diameter end face of the diffusion shell. The large-diameter edge of the diffusion shell extends outward to form a shell edge. A ﹁-shaped pressure block is provided on the shell edge, and the ﹁-shaped transverse part of the pressure block is statically pressed against the upper surface of the shell edge, while the ﹁-shaped longitudinal part is statically placed on the upper surface of the base plate. The pressure block and the base plate are fixedly connected by a first screw, thereby fixing the diffusion shell to the upper surface of the base plate.

[0019] The present invention also provides an assembly method for assembling a lug and a diffuser housing, applicable to the assembly tooling described in any of the preceding claims for assembling a lug and a diffuser housing, characterized in that it includes the following steps:

[0020] S1) Adjust the upper surface of the chuck to a horizontal position, and fix the base plate to the upper surface of the base;

[0021] S2) Fix the diffuser shell on the upper surface of the base plate so that the large diameter end face of the diffuser shell fits against the upper surface of the base plate;

[0022] S3) Rotate the upper end face of the chuck to an inclined state to ensure that the upper conical surface of the diffuser shell after assembly is in a horizontal arrangement below the drill bit;

[0023] S4) Rotate the chuck along the chuck axis until a certain hole on the base plate is rotated to the top position. Install a parallel clamp between the conical surface on the diffuser housing and the base plate. Fix the first lug to the edge of the housing by engaging and tightening the screw.

[0024] S5) Control the drill bit to drill the first pin hole and / or the first threaded bottom hole on both sides of the first lug base plate, and assemble the corresponding first pin and / or the first screw, thereby assembling the first lug onto the diffuser shell cone surface and disassembling the parallel clamping plate.

[0025] S6) Rotate the chuck 90° along the chuck axis to rotate the other hole on the base plate to the top position. Install a parallel clamp between the conical surface on the diffuser shell and the base plate. Fix the second lug to the edge of the shell by engaging and tightening the screw.

[0026] S7) Control the drill bit to drill the second pin hole and / or the second threaded bottom hole on both sides of the second lug base plate, and assemble the corresponding second pin and / or the second screw, thereby assembling the second lug to the diffuser shell cone surface and disassembling the parallel clamp plate.

[0027] S8) Remove the diffuser housing from the upper end face of the base plate to complete the assembly of the lug and the diffuser housing.

[0028] Furthermore, in S5), after drilling the first pin hole and / or the first threaded bottom hole, the first pin hole and / or the first threaded bottom hole are then finely machined to ensure the assembly accuracy with the corresponding first pin and / or the first screw.

[0029] In S7), after drilling the second pin hole and / or the second threaded bottom hole, the second pin hole and / or the second threaded bottom hole are then finely machined to ensure the assembly accuracy with the corresponding second pin and / or the second screw.

[0030] The advantages of this invention are:

[0031] 1. This invention involves mounting a base plate on the upper surface of a chuck, ensuring the base plate is parallel to the upper surface of the chuck. The large-diameter end face of the diffuser housing is then fixedly mounted on the upper surface of the base plate. The chuck is then rotated, causing its upper surface to change from a horizontal to an inclined state, ensuring the assembled upper conical surface of the diffuser housing is horizontally positioned below the drill bit. Finally, lugs are mounted on the horizontally positioned upper conical surface of the diffuser housing. This invention fully utilizes the indexing head's ability to adjust the rotation angle, cleverly transforming the inclined arrangement of the upper conical surface of the diffuser housing into a horizontal arrangement, thus facilitating subsequent lug positioning, marking, and drilling.

[0032] 2. In this invention, at least two holes are drilled around the perimeter of the base plate, forming a 90° angle between adjacent holes. The indexing head is rotated to rotate one of the holes on the base plate to the top position, while keeping the conical surface on the diffuser shell where one of the holes is located rotated to a horizontal arrangement. Then, a parallel clamping plate that can fix the first ear is installed at the connection between the conical surface on the horizontal diffuser shell and the corresponding hole. The first ear is positioned by the parallel clamping plate. Then, the first ear is drilled and holes are drilled using a drill bit. After the first ear is installed, the parallel clamping plate is removed.

[0033] 3. In this invention, the chuck is rotated 90° along the chuck axis, so that another hole on the base plate is rotated to the top position, and the conical surface on the diffuser shell where the other hole is located is rotated to a horizontal arrangement. Then, a parallel clamping plate that can fix the second ear is assembled at the connection between the conical surface on the horizontal diffuser shell and the corresponding hole. The second ear is positioned by the parallel clamping plate, and then the second ear is marked, drilled and installed using a drill bit. After the second ear is installed, the parallel clamping plate is removed.

[0034] This invention relates to an assembly fixture and assembly method for assembling lugs and diffuser housings. The fixture assists in positioning and drilling the lugs, which, compared to manually controlling the positioning and drilling of the lugs using a conventional drilling machine, effectively improves assembly efficiency, ensures the assembly accuracy of the diffuser housing and lugs, and enhances the assembly quality of the diffuser housing and lugs. Attached Figure Description

[0035] Figure 1 This is a partial cross-sectional view of the assembly tooling in the present invention during the assembly process;

[0036] Figure 2 for Figure 1 A magnified view of part E in the image;

[0037] Figure 3 for Figure 1 A magnified view of part F in the image;

[0038] Figure 4 for Figure 1 View A in the middle;

[0039] Figure 5 for Figure 1 View B in the middle;

[0040] Figure 6 A three-dimensional view of the fixing lugs for the parallel clamps;

[0041] Figure 7 This is a partial schematic diagram of the diffuser housing mounted on the upper surface of the base plate;

[0042] Figure 8 A schematic diagram of the front view of the assembled lugs and diffuser housing;

[0043] Figure 9 for Figure 8 A partial sectional view along the QQ direction;

[0044] Figure 10 for Figure 8 A partial sectional view along the PP direction;

[0045] In the figure: 1. CNC radial drilling machine; 2. Indexing head; 3. Base plate; 4. Diffuser shell; 5a. First lug; 5b. Second lug; 6. Parallel clamping plate.

[0046] The CNC radial drilling machine 1 includes: a CNC radial drill 1-1 and a drill bit 1-2;

[0047] The indexing head 2 includes: chuck 2-1, base 2-2, and pull rod 2-3;

[0048] The base plate 3 includes: a positioning step groove 3-1, a boss 3-2, a pressure block 3-3, a first screw 3-4, and an opening 3-5;

[0049] The diffuser housing 4 includes: housing edge 4-1, housing flange 4-2, and housing groove 4-3;

[0050] The first lug 5a includes: a first pin hole 5a-1 (not shown in the figure), a first pin 5a-2, a first threaded bottom hole 5a-3 (not shown in the figure), and a first screw 5a-4;

[0051] The second lug 5b includes: a second pin hole 5b-1 (not shown in the figure), a second pin 5b-2, a second threaded bottom hole 5b-3 (not shown in the figure), and a second screw 5b-4;

[0052] The parallel clamp 6 includes: a U-shaped clamping frame 6-1, a threaded hole 6-2 (not shown in the figure), and a tightening screw 6-3. Detailed Implementation

[0053] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0055] like Figures 1-10As shown, the present invention provides an assembly fixture for assembling lugs and a diffuser housing, comprising a CNC radial drilling machine 1. A CNC radial drill 1-1 is mounted on the worktable of the CNC radial drilling machine 1. A drill bit 1-2 extending vertically downward is mounted on the CNC radial drill 1-1. An indexing head 2 located below the drill bit 1-2 is also mounted on the worktable of the CNC radial drilling machine 1. A chuck 2-1 with an adjustable rotation angle is mounted on the upper surface of the indexing head 2-1. A base 2-2 is mounted at the center of the upper surface of the chuck 2-1. A base plate 3 located below the drill bit 1-2 is fixedly supported on the base 2-2. The base plate 3 is parallel to the upper surface of the chuck 2-1.

[0056] Preferably, the lower end face of the base plate 3 is provided with a positioning step groove 3-1 that matches the upper end face of the base 2-2. The upper end face of the base 2-2 is embedded in the base plate 3 through the positioning step groove 3-1, thereby completing the positioning of the base plate 3. Several tie rods 2-3 for fixing the base plate 3 are also connected between the chuck 2-1 and the base plate 3.

[0057] Specifically, each of the pull rods 2-3 is T-shaped, with the upper end of the T-shaped rod being secured to the upper surface of the base plate 3, and the lower end of the T-shaped rod being embedded in the upper part of the base 2-2.

[0058] Preferably, the plurality of the tie rods 2-3 are arranged around the perimeter of the base plate 3. In this embodiment, six tie rods 2-3 are used to connect the base plate 3 and the chuck 2-1.

[0059] At least two openings 3-5 are excavated around the perimeter of the base plate 3, and the adjacent openings 3-5 form a 90° angle. A diffuser shell 4 is assembled on the upper surface of the base plate 3, and the large diameter end face of the diffuser shell 4 is in contact with the upper surface of the base plate 3. The upper surface of the chuck 2-1 is rotated to an inclined state to ensure that the upper conical surface of the diffuser shell 4 where one of the openings 3-5 is located is in a horizontal arrangement below the drill bit 1-2.

[0060] Specifically, the upper surface of the base plate 3 is provided with a boss 3-2 that matches the large diameter end face of the diffusion shell 4. The large diameter edge of the diffusion shell 4 extends outward to form a shell edge 4-1. A ﹁-shaped pressing block 3-3 is provided on the shell edge 4-1. The ﹁-shaped transverse part of the pressing block 3-3 is statically pressed on the upper surface of the shell edge 4-1, and the ﹁-shaped longitudinal part is statically placed on the upper surface of the base plate 3. The pressing block 3-3 and the base plate 3 are fixedly connected by a first screw 3-4, thereby fixing the diffusion shell 4 to the upper surface of the base plate 3.

[0061] Preferably, the pressure blocks 3-3 are distributed in a circumferential shape around the edge 4-1 of the shell. In this embodiment, four pressure blocks 3-3 are used to press down the edge 4-1 of the shell.

[0062] In this invention, the base plate 3 is installed on the upper surface of the chuck 2-1, and the base plate 3 is kept parallel to the upper surface of the chuck 2-1. Then, the large-diameter end face of the diffuser shell 4 is fixedly installed on the upper surface of the base plate 3. Then, the chuck 2-1 is rotated so that the upper surface of the chuck 2-1 is rotated from a horizontal state to an inclined state, ensuring that the upper conical surface of the diffuser shell 3 after assembly is in a horizontal arrangement state located below the drill bit. Finally, the support lugs are installed on the upper conical surface of the diffuser shell in the horizontal arrangement state. This invention makes full use of the function of the indexing head 2 to adjust the rotation angle, and cleverly adjusts the inclined arrangement state of the upper conical surface of the diffuser shell 4 to a horizontal arrangement state, thereby facilitating the subsequent positioning and drilling of the support lugs.

[0063] The diffuser shell 4 has a shell edge 4-1 extending outward from its large diameter edge, and the shell edge 4-1 extends to the opening 3-5. The surface of the diffuser shell 4 is also provided with a shell flange 4-2 arranged parallel to the shell edge 4-1. The shell edge 4-1 and the shell flange 4-2 form a shell groove 4-3.

[0064] One of the openings 3-5 has a first lug 5a or a second lug 5b fitted inside the horizontal shell groove 4-3. A parallel clamp 6 is provided on the outside of the first lug 5a or the second lug 5b for fixing the first lug 5a or the second lug 5b, and the parallel clamp 6 passes through the corresponding opening 3-5.

[0065] The first lug 5a or the second lug 5b is located directly below the drill bit 1-2. The drill bit 1-2 makes dots and holes in the base plate of the first lug 5a or the second lug 5b respectively to complete the assembly of the first lug 5a or the second lug 5b with the diffuser shell 4.

[0066] Preferably, the parallel clamping plate 6 includes a U-shaped clamping frame 6-1. The inner side of the right end of the U-shaped clamping frame 6-1 is in contact with the right end face of the first lug 5a or the second lug 5b. The inner side of the left end of the U-shaped clamping frame 6-1 is in contact with the outer side of the shell edge 4-1. A threaded hole 6-2 is drilled at the left end of the U-shaped clamping frame 6-1, which abuts against the shell edge 4-1. A tightening screw 6-3 is provided in the threaded hole 6-2. By tightening the tightening screw 6-3, the first lug 5a or the second lug 5b is fixed together with the shell edge 4-1.

[0067] In this invention, at least two openings 3-5 are drilled around the perimeter of the base plate 3, forming a 90° angle between adjacent openings 3-5. The indexing head 2 is rotated to rotate one of the openings 3-5 on the base plate 3 to the top position, while keeping the conical surface on the diffuser shell 4 where one of the openings 3-5 is located rotated to a horizontal arrangement. Then, a parallel clamping plate 6 that can fix the first ear 5a is installed at the connection between the conical surface on the horizontal diffuser shell 4 and the corresponding opening 3-5. The first ear 5a is positioned by the parallel clamping plate 6. Then, the drill bit 1-2 is used to drill points and holes in the first ear 5a. After the first ear 5a is installed, the parallel clamping plate is removed.

[0068] Then rotate chuck 2-1 90° along the axis of chuck 2-1, so that the other hole 3-5 on the base plate 3 is rotated to the top position, and keep the conical surface on the diffuser shell 4 where the other hole 3-5 is located rotated to a horizontal arrangement. Then, assemble a parallel clamping plate 6 that can fix the second ear 5b at the connection between the conical surface on the horizontal diffuser shell 4 and the corresponding hole 3-5. Position the second ear 5b by the parallel clamping plate 6, and then use drill bit 1-2 to mark, drill holes and install the second ear 5b. After the second ear 5b is installed, remove the parallel clamping plate 6.

[0069] Specifically, the first lug 5a includes a first pin hole 5a-1 and / or a first threaded bottom hole 5a-3 located on the base plate; the first pin hole 5a-1 is used to form a positioning guide with the drill bit 1-2, and a first pin 5a-2 is installed in the first pin hole 5a-1, through which the first lug 5a is assembled with the diffuser shell 4; the first threaded bottom hole 5a-3 is used to form a positioning guide with the drill bit 1-2, and a first screw 5a-4 is installed in the first threaded bottom hole 5a-3, through which the first lug 5a is assembled with the diffuser shell 4.

[0070] The second lug 5b includes a second pin hole 5b-1 and / or a second threaded bottom hole 5b-3 located on the base plate; the second pin hole 5b-1 is used to form a positioning guide with the drill bit 1-2, and a second pin 5b-2 is installed in the second pin hole 5b-1, through which the second lug 5b is assembled with the diffuser housing 4; the second threaded bottom hole 5b-3 is used to form a positioning guide with the drill bit 1-2, and a second screw 5b-4 is installed in the second threaded bottom hole 5b-3, through which the second lug 5b is assembled with the diffuser housing 4.

[0071] Preferably, the first pin 5a-2 and the second pin 5b-2 are both φ6 pins, and the first screw 5a-4 and the second screw 5b-4 are both M8 screws.

[0072] Specifically, the first support ear 5a has a first pin hole 5a-1 at each end of its base plate, and four first threaded bottom holes 5a-3 at each end of its base plate, which are arranged in a grid pattern; the second support ear 5b has a second pin hole 5b-1 at each end of its base plate, and four second threaded bottom holes 5b-3 at each end of its base plate, which are arranged in a grid pattern.

[0073] In this embodiment, the first pin hole 5a-1 on the base plate of the first ear 5a is located in the middle of the four first threaded bottom holes 5a-3 arranged in a grid pattern; the second pin hole 5b-1 on the base plate of the second ear 5b is located in the middle of the four second threaded bottom holes 5b-3 arranged in a grid pattern.

[0074] The assembly fixture in this invention is equipped with a rotary indexing head chuck, which makes it easy for the operator to quickly find the machining and assembly position of the second ear after machining and assembling the first ear.

[0075] This invention also provides an assembly method for assembling the lug and the diffuser housing, applicable to the aforementioned assembly fixture for assembling the lug and the diffuser housing, comprising the following steps:

[0076] S1) Adjust the upper surface of the chuck 2-1 to a horizontal position, and fix the base plate 3 to the upper surface of the base 2-2.

[0077] Specifically, the upper end face of the base 2-2 is embedded in the positioning step groove 3-1 on the lower end face of the base plate 3. Then, multiple T-shaped tie rods 2-3 arranged around the perimeter of the base plate 3 pass through the base plate 3 from the bottom, so that the upper end of the T is locked onto the upper end face of the base plate 3 and the lower end of the T is embedded in the upper part of the base 2-2, thereby completing the fixation of the base plate 3.

[0078] S2) Fix the diffusion shell 4 on the upper end face of the base plate 3 so that the large diameter end face of the diffusion shell 4 is in contact with the upper end face of the base plate 3.

[0079] Specifically, the large-diameter end face of the diffuser shell 4 is fastened onto the boss 3-2 on the upper end face of the base plate 3, the edge of the shell 4-1 is pressed down by four pressure blocks 3-3, and the diffuser shell 4 is fixed to the upper end face of the base plate 3 by the first screw 3-4.

[0080] S3) Rotate the upper end face of chuck 2-1 to an inclined state to ensure that the upper conical surface of the assembled diffuser shell 4 is in a horizontal arrangement below the drill bit 1-2.

[0081] In this embodiment, according to the tilt angle of the cone surface of the diffuser housing 4, the end face of the chuck is rotated to a 16° angle with the vertical plane by rotating the scale handle of the indexing head chuck, so that the cone surface of the diffuser housing 4 is in a horizontal arrangement state.

[0082] S4) Rotate the chuck 2-1 along the axis of the chuck 2-1 until a certain hole 3-5 on the base plate 3 is rotated to the top position. Assemble the parallel clamping plate 6 between the conical surface of the diffuser shell 4 and the base plate 3. Fix the first lug 5a to the edge 4-1 of the shell by screwing in the screw 6-3.

[0083] S5) Control the drill bit 1-2 to drill the first pin hole 5a-1 and / or the first threaded bottom hole 5a-3 on both sides of the base plate of the first lug 5a, and assemble the corresponding first pin 5a-2 and / or the first screw 5a-4, thereby assembling the first lug 5a to the conical surface of the diffuser shell 4 and disassembling the parallel clamping plate 6.

[0084] Preferably, after drilling the first pin hole 5a-1 and / or the first threaded bottom hole 5a-3, the first pin hole 5a-1 and / or the first threaded bottom hole 5a-3 are then finely machined to ensure the assembly accuracy with the corresponding first pin 5a-2 and / or the first screw 5a-4.

[0085] S6) Rotate the chuck 2-1 90° along the axis of the chuck 2-1 so that the other hole 3-5 on the base plate 3 is rotated to the top position. Assemble the parallel clamping plate 6 between the conical surface of the diffuser shell 4 and the base plate 3. Fix the second lug 5b to the edge of the shell 4-1 by screwing in the tightening screw 6-3.

[0086] S7) Control drill bit 1-2 to drill second pin hole 5b-1 and / or second threaded bottom hole 5b-3 on both sides of the base plate of second lug 5b, and assemble the corresponding second pin 5b-2 and / or second screw 5b-4, thereby assembling the second lug 5b to the conical surface of the diffuser shell 4 and disassembling the parallel clamping plate 6.

[0087] Preferably, after drilling the second pin hole 5b-1 and / or the second threaded bottom hole 5b-3, the second pin hole 5b-1 and / or the second threaded bottom hole 5b-3 are then finely machined to ensure the assembly accuracy with the corresponding second pin 5b-2 and / or the second screw 5b-4.

[0088] S8) Remove the diffuser housing 4 from the upper end face of the base plate 3 to complete the assembly of the lug and the diffuser housing 4.

[0089] This invention relates to an assembly fixture and assembly method for assembling lugs and diffuser housings. The fixture assists in positioning and drilling the lugs, which, compared to manually controlling the positioning and drilling of the lugs using a conventional drilling machine, effectively improves assembly efficiency, ensures the assembly accuracy of the diffuser housing and lugs, and enhances the assembly quality of the diffuser housing and lugs.

[0090] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. An assembly fixture for assembling a lug and a diffuser housing, comprising a CNC radial drilling machine (1), wherein a CNC radial drill (1-1) is provided on the worktable of the CNC radial drilling machine (1), and a vertically downward extending drill bit (1-2) is provided on the CNC radial drill (1-1), characterized in that: The CNC radial drilling machine (1) is also provided with an indexing head (2) located below the drill bit (1-2) on the worktable. The upper end face of the indexing head (2) is provided with a chuck (2-1) that can adjust the rotation angle. A base (2-2) is provided at the center of the upper end face of the chuck (2-1). A base plate (3) located below the drill bit (1-2) is fixedly supported on the base plate (2-2). The base plate (3) is parallel to the upper end face of the chuck (2-1). The base plate (3) has at least two openings (3-5) around its perimeter, and the adjacent openings (3-5) form a 90° angle. The upper end face of the base plate (3) is fitted with a diffuser shell (4), and the large diameter end face of the diffuser shell (4) is in contact with the upper end face of the base plate (3). The upper end face of the chuck (2-1) is rotated to an inclined state to ensure that the upper conical surface of the diffuser shell (4) where one of the openings (3-5) is located after assembly is in a horizontal arrangement below the drill bit (1-2). The diffuser shell (4) has a shell edge (4-1) extending outward from the large diameter edge, and the shell edge (4-1) extends to the opening (3-5). The surface of the diffuser shell (4) is also provided with a shell flange (4-2) arranged parallel to the shell edge (4-1). The shell edge (4-1) and the shell flange (4-2) form a shell groove (4-3). One of the openings (3-5) is fitted with a first lug (5a) or a second lug (5b) in the horizontal shell groove (4-3). A parallel clamp (6) for fixing the first lug (5a) or the second lug (5b) is provided on the outside of the first lug (5a) or the second lug (5b), and the parallel clamp (6) passes through the corresponding opening (3-5). The parallel clamp (6) includes a U-shaped clamp frame (6-1). The inner side of the right end of the U-shaped clamp frame (6-1) is in contact with the right end face of the first lug (5a) or the second lug (5b). The inner side of the left end of the U-shaped clamp frame (6-1) is in contact with the outer side of the shell edge (4-1). The left end of the U-shaped clamp frame (6-1) has a threaded hole (6-2) that abuts against the shell edge (4-1). A tightening screw (6-3) is provided in the threaded hole (6-2). By tightening the tightening screw (6-3), the first lug (5a) or the second lug (5b) is fixed together with the shell edge (4-1). The first lug (5a) or the second lug (5b) is located directly below the drill bit (1-2). The drill bit (1-2) makes dots and holes on the bottom plate of the first lug (5a) or the second lug (5b) to complete the assembly of the first lug (5a) or the second lug (5b) with the diffuser shell (4).

2. The assembly fixture for assembling the lug and the diffuser housing according to claim 1, characterized in that: The first lug (5a) includes a first pin hole (5a-1) and / or a first threaded bottom hole (5a-3) located on the base plate; the first pin hole (5a-1) is used to form a positioning guide with the drill bit (1-2), and a first pin (5a-2) is installed in the first pin hole (5a-1), through which the first lug (5a) and the diffuser shell (4) are assembled into one piece; the first threaded bottom hole (5a-3) is used to form a positioning guide with the drill bit (1-2), and a first screw (5a-4) is installed in the first threaded bottom hole (5a-3), through which the first lug (5a) and the diffuser shell (4) are assembled into one piece; The second lug (5b) includes a second pin hole (5b-1) and / or a second threaded bottom hole (5b-3) located on the base plate; the second pin hole (5b-1) is used to form a positioning guide with the drill bit (1-2), and a second pin (5b-2) is installed in the second pin hole (5b-1), through which the second lug (5b) is assembled with the diffuser shell (4); the second threaded bottom hole (5b-3) is used to form a positioning guide with the drill bit (1-2), and a second screw (5b-4) is installed in the second threaded bottom hole (5b-3), through which the second lug (5b) is assembled with the diffuser shell (4).

3. The assembly fixture for assembling the lug and the diffuser housing according to claim 2, characterized in that: The first support ear (5a) has a first pin hole (5a-1) at each end of its base plate, and four first threaded bottom holes (5a-3) at each end of its base plate, which are arranged in a grid pattern. The second support ear (5b) has a second pin hole (5b-1) at each end of its base plate, and four second threaded bottom holes (5b-3) at each end of its base plate, which are arranged in a grid pattern.

4. The assembly fixture for assembling the lug and the diffuser housing according to claim 1, characterized in that: The lower end face of the base plate (3) is provided with a positioning step groove (3-1) that matches the upper end face of the base (2-2). The upper end face of the base (2-2) is embedded in the base plate (3) through the positioning step groove (3-1), thereby completing the positioning of the base plate (3). Several tie rods (2-3) for fixing the base plate (3) are also connected between the chuck (2-1) and the base plate (3).

5. The assembly tooling for assembling the lug and the diffuser housing according to claim 4, characterized in that: Each of the aforementioned pull rods (2-3) is T-shaped, with the upper end of the T-shaped rod being secured to the upper surface of the base plate (3) and the lower end of the T-shaped rod being embedded in the upper part of the base (2-2).

6. The assembly fixture for assembling the lug and the diffuser housing according to claim 5, characterized in that: Multiple tie rods (2-3) are arranged around the perimeter of the base plate (3).

7. The assembly fixture for assembling the lug and the diffuser housing according to claim 6, characterized in that: The upper surface of the base plate (3) is provided with a boss (3-2) that matches the large diameter end face of the diffuser shell (4). A ﹁-shaped pressure block (3-3) is provided on the edge (4-1) of the shell. The ﹁-shaped transverse part of the pressure block (3-3) is statically pressed on the upper surface of the edge (4-1) of the shell, and the ﹁-shaped longitudinal part is statically placed on the upper surface of the base plate (3). The pressure block (3-3) and the base plate (3) are fixedly connected by a first screw (3-4), thereby fixing the diffuser shell (4) on the upper surface of the base plate (3).

8. An assembly method for assembling a lug and a diffuser housing, applicable to the assembly tooling for assembling a lug and a diffuser housing as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1) Adjust the upper surface of the chuck (2-1) to a horizontal position, and fix the base plate (3) to the upper surface of the base (2-2); S2) Fix the diffuser shell (4) on the upper end face of the base plate (3) so that the large diameter end face of the diffuser shell (4) is in contact with the upper end face of the base plate (3); S3) Rotate the upper end face of the chuck (2-1) to an inclined state to ensure that the upper conical surface of the assembled diffuser shell (4) is in a horizontal arrangement below the drill bit (1-2); S4) Rotate the chuck (2-1) along the axis of the chuck (2-1) until a certain hole (3-5) on the base plate (3) is rotated to the top position. Assemble the parallel clamp (6) between the conical surface on the diffuser shell (4) and the base plate (3). Fix the first lug (5a) to the edge of the shell (4-1) by screwing in the tightening screw (6-3). S5) Control the drill bit (1-2) to drill the first pin hole (5a-1) and / or the first threaded bottom hole (5a-3) on both sides of the base plate of the first lug (5a), and assemble the corresponding first pin (5a-2) and / or the first screw (5a-4) to assemble the first lug (5a) to the conical surface of the diffuser shell (4) and disassemble the parallel clamp (6). S6) Rotate the chuck (2-1) 90° along the axis of the chuck (2-1) so that the other hole (3-5) on the base plate (3) is rotated to the top position. Install the parallel clamp (6) between the conical surface on the diffuser shell (4) and the base plate (3). Fix the second lug (5b) to the edge of the shell (4-1) by screwing in the tightening screw (6-3). S7) Control the drill bit (1-2) to drill the second pin hole (5b-1) and / or the second threaded bottom hole (5b-3) on both sides of the base plate of the second ear (5b), and assemble the corresponding second pin (5b-2) and / or the second screw (5b-4) to assemble the second ear (5b) to the cone surface of the diffuser shell (4) and disassemble the parallel clamp (6). S8) Remove the diffuser housing (4) from the upper end face of the base plate (3) to complete the assembly of the lug and the diffuser housing (4).

9. The assembly method for assembling the lug and the diffuser housing according to claim 8, characterized in that: In S5), after drilling the first pin hole (5a-1) and / or the first threaded bottom hole (5a-3), the first pin hole (5a-1) and / or the first threaded bottom hole (5a-3) are then finely machined to ensure the assembly accuracy with the corresponding first pin (5a-2) and / or the first screw (5a-4). In S7), after drilling the second pin hole (5b-1) and / or the second threaded bottom hole (5b-3), the second pin hole (5b-1) and / or the second threaded bottom hole (5b-3) are then finely machined to ensure the assembly accuracy with the corresponding second pin (5b-2) and / or the second screw (5b-4).

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