CN219582082U

CN219582082U - Welding tool for air inlet duct of centrifugal fan

Info

Publication number: CN219582082U
Application number: CN202223319428.1U
Authority: CN
Inventors: 杨世金; 徐建
Original assignee: Hunan Tianneng Electric Machine Manufacturing Co ltd
Current assignee: Hunan Tianneng Electric Machine Manufacturing Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-08-25
Anticipated expiration: 2032-12-09

Abstract

The utility model discloses a welding fixture for an air inlet duct of a centrifugal fan, which comprises a bottom plate, wherein a pin hole and a pressing plate hole which are matched with the air inlet duct are drilled on the plane of the bottom plate, a mounting hole on a flange of the air inlet duct is aligned with the pin hole on the bottom plate, pins are inserted into the mounting hole and the pin hole, the flange of the air inlet duct is fixed on the bottom plate through an M10x35 hexagon bolt and the pressing plate, and the center of the bottom plate is connected with a heightening seat in a welding mode. The tool is ingenious in design, simple in structure and high in practicability, and the welding of the air inlet channels of fans of different types can be realized only by replacing simple components.

Description

Welding tool for air inlet duct of centrifugal fan

Technical Field

The utility model relates to a welding tool, in particular to a welding tool for an air inlet duct of a centrifugal fan.

Background

At present, the large-batch standard type centrifugal fan air inlet duct in China adopts spinning forming, welding is not needed, and deformation is small. However, nonstandard fans are used in many occasions, nonstandard air inlet channels are necessarily used, the spinning processing needs to open the dies, and the nonstandard fans are not suitable for batch small-type multi-open dies (long die opening period and high cost), so that the welding process is more suitable. Therefore, the tool is developed and designed according to the actual conditions of industries and markets.

Disclosure of Invention

In order to solve the problems, the following technical scheme is provided:

the utility model provides a centrifugal fan air inlet duct welding frock, includes the bottom plate, has bored pinhole and the clamp plate hole that correspond with the air inlet duct adaptation on the bottom plate plane, and the mounting hole on the air inlet duct flange aligns with the pinhole on the bottom plate, and the pin has been inserted to mounting hole and pinhole, fixes the air inlet duct flange on the bottom plate through M10x35 hexagon bolt and clamp plate, and the center of bottom plate is connected with heightening seat through welded mode.

Further, the device also comprises a positioning shaft which is connected with the heightening seat on the bottom plate through threaded connection.

Further, the device also comprises a movable device, wherein the movable device is arranged at the upper end of the positioning shaft and comprises a sleeve II, a flange nut, a sleeve I, a thrust ball bearing and an elastic retainer ring for the shaft, and the movable device is connected with the positioning shaft through the flange nut.

Further, the device also comprises a shaping pressing plate and a sleeve II, wherein the shaping pressing plate is arranged on the sleeve II through an M12x40 hexagon bolt.

The utility model has the following beneficial effects:

the utility model discloses a welding tool for an air inlet duct of a centrifugal fan, which is ingenious in design, simple in structure and high in practicability, and can realize the welding of air inlet ducts of fans of different types only by replacing simple components.

Advantage 1: the welding device is designed for solving the problem of welding the air inlet duct of the nonstandard fans in the development stage and the middle and small batches. The problems that 3 parts of the flange, the conical cylinder and the straight cylinder are large in deformation and non-concentric during welding of the air inlet duct are solved. Because the air inlet duct cone and the air inlet duct straight cylinder are discharged after laser expansion, and then are formed by rolling (cone), the shape is irregular, and 3 parts are difficult to ensure to be concentric during assembly welding (the non-concentricity can lead to uneven interference between the air inlet duct and the impeller gap during assembly).

Advantage 2: in the past, the flange of the air inlet duct is subjected to integral blanking (low in material utilization rate) instead of the conventional sectional blanking and then is subjected to splice welding to form a whole circle (the material utilization rate is improved by 3 times). Examples: if a flange of phi 480x phi 450x3 is to be machined, again 500x500x3 in size, then if the mounting flange is machined in one piece, then 500x500x3 of sheet material would be sufficient to machine only 1 mounting flange, with the middle part of phi 480 being wasted. If the materials are subjected to sectional blanking (4 equal parts) and then spliced into a whole, 3 complete flanges can be manufactured from the materials with the same specification, so that the material utilization rate is greatly improved. (in the splicing mode, a fixture positioning clamping square can ensure the size is needed)

The tool is used for welding the air inlet duct, so that the welding quality is improved, the material utilization rate is improved, the cost is reduced, and a good effect is achieved in the production and application of the tool.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

figure 2 is a cross-sectional view taken along the direction A-A in figure 1,

the reference numerals are explained as follows: 1. a bottom plate; 2. centering pressing plates; 3. a second sleeve; 4. positioning a shaft; 5. a flange nut; 6. a sleeve I; 7. a thrust ball bearing; 8. a heightening seat; 9. an air inlet duct flange; 10. an air inlet duct cone; 11. an air inlet duct straight barrel; 12. a plug pin; 13. pressing the plate; 14. m10x35 hex bolts; 15. circlips for shafts; 16. m12x40 hex bolts.

Detailed Description

In the description of the present utility model, it should be noted that the terms center, upper, lower, left, right, vertical, horizontal, inner, outer, etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms first, second, and third are used for descriptive purposes only and are not to be construed as indicating or implying positive importance.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms mounted, connected, and connected should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model is further described below with reference to the accompanying drawings:

the utility model provides a centrifugal fan air inlet duct welding frock, includes bottom plate 1, has bored pinhole and the clamp plate hole that correspond with the air inlet duct adaptation on the bottom plate 1 plane, and the mounting hole on the air inlet duct flange 9 aligns with the pinhole on the bottom plate 1, and the pin has been inserted to mounting hole and pinhole, fixes air inlet duct flange 9 on bottom plate 1 through M10x35 hexagon bolt 14 and clamp plate 13, and the center of bottom plate 1 is connected with heightening seat 8 through welded mode. The device also comprises a positioning shaft 4, and the positioning shaft 4 is connected with a heightening seat 8 on the bottom plate 1 through threaded connection. The movable device is arranged at the upper end of the positioning shaft 4 and comprises a sleeve II 3, a flange nut 5, a sleeve I6, a thrust ball bearing 7 and an elastic retainer ring 15 for the shaft, and the movable device is connected with the positioning shaft 4 through the flange nut 5. The device also comprises a shaping pressing plate 2 and a sleeve II 3, wherein the shaping pressing plate 2 is arranged on the sleeve II 3 through an M12x40 hexagon bolt 16.

1. The base plate 1: the base plate 1 is made of common carbon steel (Q235) with the thickness of 20mm, and pin holes corresponding to installation holes of the air inlet duct flanges 9 of different models and threaded holes for installing the pressing plate 13 are drilled in the base plate 1.

Description: the common steel plate (Q235) is easy to obtain, and the strength can meet the requirement. And processing is convenient, and the same bottom plate 1 can be welded with air inlet channels of a plurality of model specifications, and use is convenient.

2. The movable device comprises: the movable device consists of a sleeve I6, a sleeve II 3, a 51112 thrust ball bearing 7, a shaft retainer ring, a flange nut 5 and other parts. The sleeve I6 is welded with the flange nut 5, the sleeve II 3 is in clearance fit with the positioning shaft 4, and the flange nut 5 is in thread fit with the positioning shaft 4. The flange nut 5 is turned, and the flange nut 5 moves up and down together with the "sleeve one 6". The thrust ball bearing 7 of 51112 is arranged between the axial directions of the sleeve II 3 and the sleeve I6, and the purpose of the bearing is to reduce the friction between the sleeve I6 and the sleeve II 3, so that the rotation is more flexible, the upper end of the sleeve II 3 is positioned by the shaft retainer ring, and the whole movable device is not disassembled. Because of the practical application of the tool, when the movable device moves upwards (tightens), the movable device is stressed axially, and when the movable device moves downwards (loosens), the movable device is not stressed, so that the upper end is fixed by the shaft retainer ring to meet the requirement. The movable device can be matched with positioning shafts 4 and shaping pressing plates 2 of different types for use.

3. Centering clamp plate 2: the centering pressing plate 2 is manufactured by processing a 45# steel plate, the conical surface of the centering pressing plate 2 is concentric with a positioning hole in the center, and a fan-shaped groove is formed in the end face of the centering pressing plate 2.

Description: the conical surface of the centering pressing plate 2 is matched with the conical surface of the air inlet channel, the fan-shaped groove is used for reducing weight, and the center of the centering pressing plate 2 is assembled on a sleeve II 3 in the movable device and fixed by bolts. When the air inlet channels with different types are welded, the corresponding centering pressing plate 2 is replaced.

4. Positioning shaft 4: the positioning shaft 4 is processed after heat treatment adjustment of 45 steel, the lower end of the positioning shaft 4 is arranged on the bottom plate 1, the middle of the positioning shaft is in clearance fit with a sleeve II 3 in the movable device, the top end of the positioning shaft 4 is provided with external threads, and the positioning shaft is connected with a flange nut 5 in the movable device.

Description: when different products are replaced, the corresponding positioning shaft 4 can be quickly replaced, and the efficiency is improved.

The tool has the beneficial effects that:

the tool improves the welding quality of the air inlet duct, improves the welding efficiency, has large deformation after being welded without the tool, takes a long time for adjustment and shaping, and has unsatisfactory shaping effect; and the qualification rate is low due to welding deformation and non-concentricity problems. The qualification rate is 100% after the tool is used, and no unqualified condition exists.

The tool improves the welding process and improves the material utilization rate. The original air inlet channel flange 9 is integrally blanked, and the remainder of the inner ring part of the flange is wasted. The welding mode is improved by using the tool, the air inlet duct flange 9 is equally divided into 4 parts for blanking, and the residual materials of the inner ring of the original air inlet duct can be fully utilized. If the air inlet duct flange 9 is processed into a whole, only 1 flange can be processed. If the flange is cut into 4 equal parts, 3 flanges can be processed from the material with the same specification, and the material utilization rate is improved by 3 times.

Under the condition that a tool is not used, the flange can only be processed into a whole circle, otherwise, the flange can be deformed to cause the out-of-tolerance of the mounting hole distance of the flange, and the flange is unqualified. The premise of segment splicing is that the tool is used for positioning the flange mounting holes, so that the hole pitch and the shape can be kept unchanged.

The tooling has low manufacturing cost, the main parts are simple to process, the raw materials are common carbon steel, the tooling is easy to obtain, and the tooling can be manufactured by conventional machining. The remaining thrust ball bearings 7, nuts, bolts, etc. standard parts can be purchased directly from the market.

The working principle of the utility model is as follows:

the first step: and 4 equally divided flanges are assembled on a tool, and inserted into flange mounting holes by bolts 12 to be positioned, so that the position of the mounting holes is ensured.

And a second step of: the air inlet duct cone 10 is arranged in the flange inner ring, the surrounding pressing plates are pressed on the flange to be locked, and the air inlet duct cone 10 and the flange are fixed together by spot welding.

And a third step of: the M20 flange nut 5 is turned by a spanner, the shaping pressing plate 2 is driven by the moving device to move upwards, the conical surface of the shaping pressing plate 2 is attached to the conical surface of the air inlet duct, and the air inlet duct is reversely tensioned and corrected.

Fourth step: the straight cylinder 11 of the air inlet channel is arranged on the excircle of the spigot of the shaping pressing plate 2, the straight cylinder 11 of the air inlet channel is fixed on the conical cylinder 10 of the air inlet channel along the circumference of the shaping pressing plate 2 by spot welding, and the deformed parts of all parts of the air inlet channel are knocked by a hammer for adjusting and shaping.

Fifth step: after the adjustment and the shaping are completed, full welding is applied to the connecting positions of all the components, the workpiece is slightly cooled after about 5-10 minutes, after the shape is fixed, the M20 flange nut 5 is reversely rotated by a spanner, the shaping pressing plate 2 moves downwards along with a moving device to separate from the straight cylinder 11 of the air inlet duct, then the pressing plate pressed on the flange below is loosened, the air inlet duct after the welding is completed is taken out, and the welding is completed.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.

Claims

1. A centrifugal fan air inlet duct welding frock, its characterized in that: including bottom plate (1), bore on bottom plate (1) plane have with the pinhole and the clamp plate hole that correspond of air inlet duct adaptation, the mounting hole on air inlet duct flange (9) aligns with the pinhole on bottom plate (1), and the pin has been inserted to mounting hole and pinhole, fixes air inlet duct flange (9) on bottom plate (1) through M10x35 hexagon bolt (14) and pressing plate (13), and the center of bottom plate (1) is connected with heightening seat (8) through the welded mode.

2. The centrifugal fan air inlet duct welding tool according to claim 1, wherein: the positioning device is characterized by further comprising a positioning shaft (4), wherein the positioning shaft (4) is connected with a heightening seat (8) on the bottom plate (1) through threaded connection.

3. The centrifugal fan air inlet duct welding tool according to claim 2, wherein: the movable device is mounted at the upper end of the positioning shaft (4), and comprises a sleeve II (3), a flange nut (5), a sleeve I (6), a thrust ball bearing (7) and an elastic retainer ring (15) for the shaft, and the movable device is connected with the positioning shaft (4) through the flange nut (5).

4. The centrifugal fan air inlet duct welding tool according to claim 3, wherein: the novel plastic sleeve comprises a plastic sleeve body and is characterized by further comprising a shaping pressing plate (2) and a sleeve II (3), wherein the shaping pressing plate (2) is arranged on the sleeve II (3) through an M12x40 hexagonal bolt (16).