Riveting clamp and method for funnel mixer assembly

Abstract

The invention relates to the technical field of aero-engine manufacturing, in particular to a riveting clamp and method for a funnel mixer assembly. The riveting clamp comprises a bottom plate and bases annularly and evenly distributed on the outer edge of the top face of the bottom plate. An arch-shaped frame positioning rod is inserted into the base in a sliding manner; a V-shaped groove for accommodating the arch-shaped frame is formed in the inner side end of the arch-shaped frame positioning rod; a supporting plate is installed on the lower surface of the inner side end of the arch-shaped frame positioning rod and used for supporting the arch-shaped frame and the reinforcing ring. A plurality of arc-shaped positioning strips are annularly and uniformly distributed on the top surface of the bottom plate, and positioning arc surfaces on the inner sides of all the arc-shaped positioning strips are positioned on the same circumference; a plurality of expansion blocks are installed on the top face of the bottom plate in a sliding mode and used for expanding lobes on a mixer welding assembly. A plurality of driving mechanisms are arranged on the top face of the bottom plate, each expansion block is correspondingly provided with one driving mechanism, and the driving mechanisms are connected with the expansion blocks and used for driving the expansion blocks to slide in the radial direction.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engine manufacturing, and in particular to a riveting fixture and a method for a funnel mixer assembly. Background Art

[0002] The funnel mixer assembly is a key component of an aviation engine, used to mix the internal and external bypass gases; a funnel mixer assembly is composed of a mixer welding assembly, a reinforcement ring 102 and fourteen bow frames 101 riveted together. The structural schematic diagram of the funnel mixer assembly is shown in FIG. Figure 1 , Figure 2 shown.

[0003] The reinforcing ring 102 is a conical ring with a thickness of 0.8 mm, and the bow frame 101 has a thickness of 1.2 mm, both of which are thin-walled and easily deformable parts. The mixer welding assembly is welded by combining 28 funnel-shaped lobes 103 with a thickness of 0.8 mm and 1 mounting edge 104, and the inner profile of the lobe 103 has an inwardly protruding funnel body 105. The funnel-shaped lobe is easy to deform during welding, and the lobe profile and the taper of the part are difficult to ensure in a free state, resulting in different degrees of fit between the reinforcing ring 102 and each lobe in the mixer welding assembly and different gap sizes during positioning and installing the bow frame 101 and the reinforcing ring 102. In addition, due to the funnel-shaped structure of the mixer welding assembly, it is difficult to clamp and position the parts using commonly used positioning and clamping tools and device methods, and it is impossible to ensure the consistency of each lobe profile of the welding assembly. On the other hand, the position of the bow frame 101 is determined by the operator's visual marking, which leads to differences in the positioning position of the bow frame 101. The above reasons lead to deviations in the installation positions of the reinforcing ring 102 and the bow frame 101, affecting the product quality of the entire mixer assembly.

[0004] At present, during the process of riveting the reinforcement ring 102 and the bow frame 101 on site, multiple people are required to assemble and mark their riveting positions. When processing one funnel mixer component, at least four assembly workers are required to assist in assembly and marking and confirm its assembly position on site. This processing method is not only time-consuming and labor-intensive, and wastes a lot of labor costs, but also causes the riveting positions of the bow frame 101, the reinforcement ring 102 and the mixer welding assembly to not match, resulting in subsequent inability to install or inability to provide sufficient fastening force, which affects the mixer component. Summary of the invention

[0005] The main purpose of the present invention is to propose a riveting fixture and method for a funnel mixer assembly, determine the processing positions of the riveting holes of the reinforcing ring and the bow frame, reduce the production cost of the funnel mixer assembly, improve the accuracy and stability of the installation positions of the reinforcing ring and the bow frame in the funnel mixer assembly, and improve the product quality of the funnel mixer assembly.

[0006] To achieve the above-mentioned purpose, on the one hand, the present invention proposes a riveting fixture for a funnel mixer assembly, comprising a bottom plate and a base evenly distributed in an annular manner at the outer edge position of the top surface of the bottom plate; a bow frame positioning rod is slidably inserted on the base, and the inner end of the bow frame positioning rod is provided with a V-shaped groove for accommodating the bow frame; a supporting plate is installed on the lower surface of the inner end of the bow frame positioning rod for supporting the bow frame and the reinforcement ring; a plurality of arc-shaped positioning strips are evenly distributed in an annular manner on the top surface of the bottom plate, and the positioning arc surfaces on the inner sides of all the arc-shaped positioning strips are on the same circumference; a plurality of expansion blocks are slidably installed on the top surface of the bottom plate for expanding the lobes on the mixer welding assembly; a plurality of driving mechanisms are arranged on the top surface of the bottom plate, and each expansion block corresponds to a driving mechanism, and the driving mechanism is connected to the expansion block for driving the expansion block to slide radially.

[0007] Preferably, a rectangular sliding hole is provided on the base; the bow frame positioning rod includes a sliding plug-in portion, the cross-section of the sliding plug-in portion is rectangular; the sliding plug-in portion is slidably inserted in the rectangular sliding hole; a tightening screw is screwed on the base, a strip groove is provided on the top surface of the sliding plug-in portion, and the lower end of the tightening screw extends into the strip groove.

[0008] Preferably, it also includes a pressing block, which is used to press tightly on the funnel body on the mixer welding assembly; a screw is inserted into the pressing block; the lower end of the screw passes through the funnel body and is connected to the bottom plate.

[0009] Preferably, the expansion block comprises an expansion body and a rectangular slide rod integrally formed on the expansion body; a plurality of empty slots are provided on the expansion body for accommodating the funnel body on the mixer welding assembly.

[0010] Preferably, a plurality of guide plates are evenly distributed in an annular manner on the top surface of the base plate; a U-shaped slide groove is provided on the guide plate; the rectangular slide rod is slidably inserted in the U-shaped slide groove; a clamping groove is provided at the end of the inner end of the rectangular slide rod; the driving mechanism includes a support and a driving screw screwed on the support; the support is fixedly mounted on the base plate; the outer end of the driving screw is clamped in the clamping groove, and the inner end is provided with a handle rod.

[0011] Preferably, when the expansion block moves radially outward and expands the lobes on the mixer welding assembly, movable pins are inserted into the guide plate and the rectangular slide rod.

[0012] Preferably, a pin mounting seat is provided on the top surface of the bottom plate near the edge, and a reference pin is inserted into the pin mounting seat.

[0013] On the other hand, the present invention also provides a method for machining riveting holes of a funnel mixer assembly, using the above-mentioned riveting fixture, comprising the following steps:

[0014] S1. Sleeve the reinforcement ring on the mixer welding assembly, and place the mixer welding assembly with the reinforcement ring on the bottom plate; use the driving mechanism to drive the expansion block to move radially outward and expand on the inner surface of the lobe on the mixer welding assembly, so that the outer surface of the lower end of the lobe fits with the positioning arc surface of the arc positioning strip;

[0015] S2, placing the arch frame in the V-shaped groove of the arch frame positioning rod, and the lower end of the arch frame against the top surface of the support plate; pushing the arch frame positioning rod inward along the radial direction, and lifting the reinforcement ring upward, and continue to push the arch frame positioning rod inward, lower the reinforcement ring, so that the support plate is supported on the lower end surface of the reinforcement ring;

[0016] S3, further push the arch frame positioning rod inward along the radial direction, so that the arch frame fits with the reinforcement ring, and the reinforcement ring fits with the lobe; perform positioning spot welding on the reinforcement ring and the lobe; perform positioning spot welding on the arch frame and the reinforcement ring;

[0017] S4, processing riveting holes;

[0018] S5. Rivet the reinforcing ring and the bow frame.

[0019] Preferably, in step S4, before processing the riveting holes on the parts, the assembly formed by the base and the bow frame positioning rod is first removed from the bottom plate.

[0020] Preferably, in step S1, when the expansion block moves radially outward to tighten the lobe into place, a movable pin is inserted on the guide plate and the rectangular slide rod; at the same time, a pressure block is placed on the funnel body of the mixer welding assembly, and a screw is inserted on the pressure block, the lower end of the screw passes through the funnel body and is connected to the bottom plate, the screw is tightened, and the funnel body is pressed by the pressure block; in step S3, before performing the positioning spot welding, the tightening screw on the base is tightened, and the bow frame positioning rod is tightened by the tightening screw; in step S4, after the riveting hole processing is completed, the corresponding "0" position is marked at the angular positioning position corresponding to the reference pin on the reinforcement ring and the lobe, and then the bow frame is numbered and marked in clockwise direction; the positioning welding points on the reinforcement ring, bow frame and lobe are ground off.

[0021] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0022] (1) By utilizing the riveting fixture provided by the present invention, the thin-walled lobes of the easily deformable mixer welding assembly can be stretched, pressed and limited to fix them, and the reinforcing ring and the bow frame assembly position can be accurately located.

[0023] (2) By adopting the riveting fixture provided by the present invention, when riveting the reinforcement ring and the bow frame, it is not necessary to process the riveting process holes of the single piece, and all the single pieces in the mixer assembly can be quickly clamped and positioned to process the riveting holes, so that the mixer assembly can be mass-produced, greatly reducing the processing cost of each piece.

[0024] (3) By adopting the riveting fixture provided by the present invention, there is no need for assembly and positioning assistants, thereby reducing the labor intensity of workers.

[0025] (4) By adopting the riveting method provided by the present invention, the parts are further fixed by positioning spot welding, and the positioning welding points are numbered after drilling and then polished off, thereby improving the processing accuracy of the assembly position and improving product quality.

[0026] (5) The riveting fixture and method provided by the present invention effectively solve the problem of accurate positioning and processing of the riveted reinforcement ring and the bow frame on the lobe surface, thereby improving the processing quality of the mixer assembly; it has promotional significance for other parts with similar structures and has a very wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 is a front view of the funnel mixer assembly;

[0029] Figure 2 is a top view of a funnel mixer assembly;

[0030] Figure 3 A front view of the riveting fixture provided by the present invention;

[0031] Figure 4 A top view of the riveting fixture provided by the present invention;

[0032] Figure 5 It is a front view of the expansion block in the present invention;

[0033] Figure 6 It is a left side view of the expansion block in the present invention;

[0034] Figure 7 It is a front view of an assembly formed by the arch frame positioning rod and the support plate in the present invention;

[0035] Figure 8 A top view of an assembly formed by a bow frame positioning rod and a support plate in the present invention;

[0036] Fig. 9 It is a top view of the structure of the guide plate in the present invention;

[0037] Fig.10 for Fig. 9 Middle AA section view;

[0038] Fig.11 It is a front view of the base in the present invention;

[0039] Fig.12 is a top view of the base in the present invention;

[0040] Fig.13 It is a front view of the support in the present invention;

[0041] Fig.14 A top view of the support in the present invention;

[0042] Fig.15 It is a schematic diagram of the assembly structure formed by the driving screw rod and the handle rod in the present invention;

[0043] Fig.16 It is a front view of the pressing block in the present invention;

[0044] Fig.17 A top view of the briquette in the present invention;

[0045] Fig.18 for Fig.17 Center B view.

[0046] Explanation of the accompanying drawings: 1. bottom plate; 2. expansion block; 2a. expansion body; 2b. rectangular slide rod; 2c. empty slot; 2d. card slot; 2e. second latch hole; 3. guide plate; 3a. U-shaped slide groove; 3b. first latch hole; 4. support; 5. movable latch; 6. bow frame positioning rod; 6a. V-shaped groove; 6b. strip groove; 6c. sliding plug-in part; 7. support plate; 8. arc-shaped positioning strip; 9. screw; 10. pressure block; 11. reference pin; 12. drive screw; 12a. handle rod; 13. base; 13a. rectangular slide hole; 14. tightening screw; 15. pin mounting seat; 101. bow frame; 102. reinforcement ring; 103. lobe; 104. mounting edge; 105. funnel body. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In this embodiment, the outer end refers to the end facing radially outward, and the inner end refers to the end facing radially inward; similarly, the outer side surface refers to the profile along the radially outward side, and the inner side surface refers to the profile along the radially inward side.

[0050] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] Combination Figure 1 , Figure 2 As shown, the funnel mixer assembly is composed of a mixer welding assembly, a reinforcement ring 102 and fourteen bow frames 101 riveted together. The reinforcement ring 102 is a conical ring with a thickness of 0.8 mm, and the bow frame 101 is 1.2 mm thick, both of which are thin-walled and easily deformable parts; and the mixer welding assembly is composed of 28 funnel-shaped lobes 103 with a thickness of 0.8 mm and 1 mounting edge 104, and the inner surface of the lobe 103 has a funnel body 105 protruding inward.

[0052] Combination Figures 3 to 18 As shown, on the one hand, this embodiment provides a riveting fixture for a funnel mixer assembly, comprising a bottom plate 1 and a base 13 evenly distributed in an annular manner at the outer edge of the top surface of the bottom plate 1; a bow frame positioning rod 6 is slidably inserted on the base 13, and a V-shaped groove 6a for accommodating the bow frame 101 is provided at the inner end of the bow frame positioning rod 6; a support plate 7 is installed on the lower surface of the inner end of the bow frame positioning rod 6 for supporting the bow frame 101 and the reinforcement ring 102; a plurality of arc-shaped positioning strips 8 are evenly distributed in an annular manner on the top surface of the bottom plate 1, and the positioning arc surfaces on the inner sides of all the arc-shaped positioning strips 8 are on the same circumference; a plurality of expansion blocks 2 are slidably installed on the top surface of the bottom plate 1 for expanding the lobes 103 on the mixer welding assembly; a plurality of driving mechanisms are provided on the top surface of the bottom plate 1, and one driving mechanism is provided for each expansion block, and the driving mechanism is connected to the expansion block 2 for driving the expansion block 2 to slide radially.

[0053] A rectangular sliding hole 13a is provided on the base 13; the bow frame positioning rod 6 includes a sliding plug-in portion 6c, the cross-section of the sliding plug-in portion 6c is rectangular; the sliding plug-in portion 6c is slidably inserted in the rectangular sliding hole 13a; a tightening screw 14 is screwed on the base 13, and a strip groove 6b is provided on the top surface of the sliding plug-in portion 6c, and the lower end of the tightening screw 14 extends into the strip groove 6b.

[0054] The riveting fixture also includes a pressing block 10 , which is used to press tightly on the funnel body 105 on the mixer welding assembly; a screw 9 is inserted into the pressing block 10 ; the lower end of the screw 9 passes through the funnel body 105 and is connected to the bottom plate 1 .

[0055] The expansion block 2 includes an expansion body 2a and a rectangular slide bar 2b integrally formed on the expansion body 2a; a plurality of empty slots 2c are provided on the expansion body 2a for accommodating the funnel body 105 on the mixer welding assembly. The empty slots 2c are provided to give way to the funnel body 105 to avoid interference during expansion.

[0056] A plurality of guide plates 3 are evenly distributed in an annular manner on the top surface of the bottom plate 1; a U-shaped slide groove 3a is provided on the guide plate 3; the rectangular slide rod 2b is slidably inserted in the U-shaped slide groove 3a; a clamping groove 2d is provided at the end of the inner side of the rectangular slide rod 2b; the driving mechanism includes a support 4 and a driving screw 12 screwed on the support 4; the support 4 is fixedly mounted on the bottom plate 1; the outer end of the driving screw 12 is clamped in the clamping groove 2d, and the inner end is provided with a handle rod 10. By rotating the driving screw 12, the expansion block 2 can be driven to slide along the radial direction.

[0057] When the expansion block 2 moves radially outward and expands the lobes 103 on the mixer welding assembly, a movable latch 5 is inserted on the guide plate 3 and the rectangular slide bar 2b. Specifically, a first latch hole 3b is provided on the guide plate 3, and a second latch hole 2e is provided on the rectangular slide bar 2b. When the expansion block 2 moves radially outward to expand the lobes 103, the first latch hole 3b is aligned with the second latch hole 2e. At this time, the movable latch 5 can be inserted from the first latch hole 3b and inserted downward into the second latch hole 2e, which plays a role in limiting the radial movement of the expansion block 2 and preventing it from loosening during the drilling process of the riveting hole.

[0058] A pin mounting seat 15 is provided on the top surface of the bottom plate 1 near the edge, and a reference pin 11 is inserted into the pin mounting seat 15 .

[0059] On the other hand, this embodiment also provides a method for machining riveting holes of a funnel mixer assembly, using the above-mentioned riveting fixture, comprising the following steps:

[0060] S1. Sleeve the reinforcing ring 102 on the mixer welding assembly, and place the mixer welding assembly with the reinforcing ring on the bottom plate 1; use the driving mechanism to drive the expansion block 2 to move radially outward and expand on the inner surface of the lobe 103 on the mixer welding assembly, so that the outer surface of the lower end of the lobe 103 fits with the positioning arc surface of the arc positioning strip 8;

[0061] S2, place the arch frame 101 in the V-shaped groove 6a of the arch frame positioning rod 6, and the lower end of the arch frame 101 abuts against the top surface of the support plate 7; push the arch frame positioning rod 6 inward along the radial direction, and lift the reinforcement ring 102 upward, continue to push the arch frame positioning rod 6 inward, and put down the reinforcement ring 102, so that the support plate 7 is supported on the lower end surface of the reinforcement ring 102;

[0062] S3, further push the arch frame positioning rod 6 radially inward, so that the arch frame 101 fits with the reinforcement ring 102, and the reinforcement ring 102 fits with the lobe 103; perform positioning spot welding on the reinforcement ring 102 and the lobe 103; perform positioning spot welding on the arch frame 101 and the reinforcement ring 102;

[0063] S4, processing riveting holes;

[0064] S5. Perform riveting processing on the reinforcing ring 101 and the bow frame 101 according to the riveting technical requirements.

[0065] In step S4 , before processing the riveting holes on the parts, in order to avoid interference with the drill bit, the assembly formed by the base 13 and the bow frame positioning rod 6 is first removed from the bottom plate 1 .

[0066] In step S1, when the expansion block 2 moves radially outward to expand the lobe 103 into place, a movable pin 5 is inserted on the guide plate 3 and the rectangular slide rod 2b; at the same time, a pressing block 10 is placed on the funnel body 105 of the mixer welding assembly, and a screw 9 is inserted on the pressing block 10. The lower end of the screw 9 passes through the funnel body 105 and is connected to the bottom plate 1. The screw 9 is tightened and the funnel body 105 is pressed by the pressing block 10.

[0067] In step S3 , before performing the positioning spot welding, the tightening screws 14 on the base 13 are tightened, and the arch frame positioning rods 6 are tightened by the tightening screws 14 .

[0068] In step S4, after the riveting hole processing is completed, the corresponding "0" position is marked on the angular positioning of the reinforcement ring 102 and the lobe 103 corresponding to the reference pin 11, and then the bow frame 101 is numbered and marked in clockwise order; the positioning welding points on the reinforcement ring 102, the bow frame 101 and the lobe 103 are ground off.

[0069] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A riveting fixture for a funnel mixer assembly, characterized in that: It comprises a bottom plate (1) and a base (13) evenly distributed in an annular shape at the outer edge of the top surface of the bottom plate (1); A bow frame positioning rod (6) is slidably inserted on the base (13), and a V-shaped groove (6a) for accommodating the bow frame (101) is provided at the inner end of the bow frame positioning rod (6); a support plate (7) is installed on the lower surface of the inner end of the bow frame positioning rod (6) for supporting the bow frame (101) and the reinforcement ring (102); A plurality of arc-shaped positioning strips (8) are evenly distributed in an annular manner on the top surface of the bottom plate (1), and the positioning arc surfaces inside all the arc-shaped positioning strips (8) are located on the same circumference; a plurality of expansion blocks (2) are slidably mounted on the top surface of the bottom plate (1) for expanding and tightening the lobes (103) on the mixer welding assembly; A plurality of driving mechanisms are arranged on the top surface of the bottom plate (1), one driving mechanism corresponding to each expansion block, and the driving mechanism is connected to the expansion block (2) for driving the expansion block (2) to slide radially.

2. A riveting fixture for a hopper mixer assembly as claimed in claim 1, characterized in that: A rectangular sliding hole (13a) is provided on the base (13); The bow-shaped frame positioning rod (6) comprises a sliding plug-in portion (6c), the cross section of which is rectangular; the sliding plug-in portion (6c) is slidably inserted in the rectangular sliding hole (13a); A tightening screw (14) is screwed onto the base (13), a strip groove (6b) is provided on the top surface of the sliding plug-in portion (6c), and the lower end of the tightening screw (14) extends into the strip groove (6b).

3. A riveting fixture for a funnel mixer assembly as claimed in claim 1, characterized in that: It also comprises a pressing block (10), the pressing block (10) being used to press tightly onto a funnel body (105) on a mixer welding assembly; a screw (9) is inserted into the pressing block (10); the lower end of the screw (9) passes through the funnel body (105) and is connected to the bottom plate (1).

4. A riveting fixture for a hopper mixer assembly as claimed in claim 1, characterized in that: The expansion block (2) comprises an expansion body (2a) and a rectangular sliding rod (2b) integrally formed on the expansion body (2a); a plurality of empty slots (2c) are provided on the expansion body (2a) for accommodating a funnel body (105) on a mixer welding assembly.

5. A riveting fixture for a hopper mixer assembly as claimed in claim 4, characterized in that: A plurality of guide plates (3) are evenly distributed in an annular manner on the top surface of the base plate (1); a U-shaped slide groove (3a) is provided on the guide plate (3); the rectangular slide rod (2b) is slidably inserted in the U-shaped slide groove (3a); a clamping groove (2d) is provided at the end of the inner side of the rectangular slide rod (2b); the driving mechanism comprises a support (4) and a driving screw rod (12) screwed on the support (4); the support (4) is fixedly mounted on the base plate (1); the outer end of the driving screw rod (12) is clamped in the clamping groove (2d), and the inner end is provided with a handle rod (10).

6. A riveting fixture for a hopper mixer assembly as claimed in claim 5, characterized in that: When the expansion block (2) moves radially outward and expands the lobes (103) on the mixer welding assembly, a movable latch (5) is inserted into the guide plate (3) and the rectangular slide rod (2b).

7. A riveting fixture for a hopper mixer assembly as claimed in claim 1, characterized in that: A pin mounting seat (15) is arranged on the top surface of the bottom plate (1) near the edge, and a reference pin (11) is inserted into the pin mounting seat (15).

8. A riveting method for a hopper mixer assembly, characterized in that: The riveting fixture according to any one of claims 1 to 7 comprises the following steps: S1. Sleeve the reinforcing ring (102) on the mixer welding assembly, and place the mixer welding assembly with the reinforcing ring on the bottom plate (1); use a driving mechanism to drive the expansion block (2) to move radially outward and expand on the inner surface of the lobe (103) on the mixer welding assembly, so that the outer surface of the lower end of the lobe (103) fits with the positioning arc surface of the arc positioning strip (8); S2, placing the bow frame (101) in the V-shaped groove (6a) of the bow frame positioning rod (6), with the lower end of the bow frame (101) resting against the top surface of the support plate (7); pushing the bow frame positioning rod (6) inwardly along the radial direction, and lifting the reinforcement ring (102) upward, and continuing to push the bow frame positioning rod (6) inwardly, lowering the reinforcement ring (102), so that the support plate (7) is supported on the lower end surface of the reinforcement ring (102); S3, further pushing the arch frame positioning rod (6) inwardly along the radial direction, so that the arch frame (101) and the reinforcement ring (102) are in contact with each other, and the reinforcement ring (102) and the lobe (103) are in contact with each other; performing positioning spot welding on the reinforcement ring (102) and the lobe (103); performing positioning spot welding on the arch frame (101) and the reinforcement ring (102); S4, processing riveting holes; S5. Riveting the reinforcing ring (102) and the bow frame (101).

9. A method for machining riveting holes for a hopper mixer assembly as claimed in claim 8, characterized in that: In the step S4, before processing the riveting holes on the parts, the assembly formed by the base (13) and the bow frame positioning rod (6) is first removed from the bottom plate (1).

10. A method for machining riveting holes for a hopper mixer assembly as claimed in claim 8, characterized in that: In the step S1, when the expansion block (2) moves radially outward to expand the lobe (103) into place, a movable latch (5) is inserted on the guide plate (3) and the rectangular slide bar (2b); at the same time, a pressing block (10) is placed on the funnel body (105) of the mixer welding assembly, and a screw (9) is inserted on the pressing block (10), the lower end of the screw (9) passes through the funnel body (105) and is connected to the bottom plate (1), the screw (9) is tightened, and the funnel body (105) is pressed by the pressing block (10); In step S3, before performing the positioning spot welding, the tightening screw (14) on the base (13) is tightened, and the arch frame positioning rod (6) is tightened by the tightening screw (14); In step S4, after the riveting hole processing is completed, the corresponding "0" position is marked on the reinforcing ring (102) and the lobe (103) at the angular positioning position corresponding to the reference pin (11), and then the bow frame (101) is numbered and marked in a clockwise manner; and the positioning welding points on the reinforcing ring (102), the bow frame (101) and the lobe (103) are ground off.

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