Impeller welding device

Abstract

The present invention provides an impeller welding device, which is used to weld the impeller constituent units of the following two schemes into an impeller assembly through a welding device. The impeller includes a base plate, blades and a cover plate, the base plate and the blades are integrally injection molded, the front side surface of the blade is a smooth surface, and the cover plate is welded to the front side surface of the blade; the second is that the impeller includes a base plate, blades and a cover plate, the cover plate and the blades are integrally injection molded, the rear side surface of the blade is a smooth surface, and the base plate is welded to the rear side surface of the blade.

Description

Technical Field

[0001] The invention relates to an impeller and a welding and forming device thereof, in particular to an impeller welding device for a pump. Background Art

[0002] Centrifugal pumps are very common in industrial and agricultural production. Considering the characteristics of the medium being transported, plastic pumps can meet the needs of transporting corrosive media, and of course the impellers are also made of plastic. Among the impeller molding solutions, injection molding is the easiest solution to think of. However, due to the structural limitations of the impeller and the consideration of molding efficiency, how to process the impeller is still a problem that the industry has always faced for a long time.

[0003] In the prior art, the name disclosed in the Chinese patent document is "Combined welded water pump impeller and its forming method" (publication number CN102996502A). In order to solve the technical problem referred to in the background technology, the technical solution adopted by the prior art is that the combined welded water pump impeller is welded by a hub 7, a reinforcing plate 6 and a plurality of impeller petals 8; each impeller petal 8 is composed of a rear cover plate petal 3, a blade 2, and a front cover plate petal 1, and the rear cover plate petal 3, the blade 2, and the front cover plate petal 1 are punched into a three-dimensional impeller petal 8 by a plate on a special mold; the edge line of each rear cover plate petal 3 is butted with the intersection line of the blade and the rear cover plate petal of another rear cover plate petal to form a rear weld 4, and the edge line of each front cover plate petal is butted with the intersection line of the blade and the front cover plate petal of another front cover plate petal to form a front weld 5, and each impeller petal 8 is welded into a whole with a welding rod on the outside of the weld, and then the hub 7 and the reinforcing plate 6 are welded, so as to obtain the welded impeller of the present invention. The core of this solution is to firstly punch out the impeller blade 8, and then weld a number of impeller blades 8 in the circumferential direction to form a complete impeller.

[0004] Another patent document entitled "Intermittent Ultrasonic Welding Impeller" (publication number CN207485730U) includes an impeller body 2 and a cover plate 1. Blades 4 are distributed on the inner side of the impeller body 2. The blades 4 are arc-shaped and distributed around the circumference of the central hole of the impeller body 2. The cover plate 1 covers the impeller body 2 and sandwiches the blades 4 therebetween. Specifically, referring to the enlarged portion of FIG. 1, welding ribs 6 are provided on the surface of the blades 4. The welding ribs 6 are distributed on the surface of the blades 4 at intervals. The width of the welding ribs 6 is narrower than that of the blades 4 and forms a stepped structure with the blades 4. Specifically, referring to FIG. Figure 2 The inner side of the cover plate 1 is provided with welding grooves 3 adapted to the contour of the blade 4; Figure 3 It can be seen that the welding rib 6 is inserted in the welding groove 3, and the height of the welding rib 6 is higher than the depth of the welding groove 3, so that a certain interference is formed to avoid cold welding; the blade 4 is stuck in the notch of the welding groove 3 to play a positioning role, and the welding rib and the welding groove are fixed together by ultrasonic welding.

[0005] Of the two schemes mentioned above, the former has more units and a large welding workload. The units, that is, the multiple impeller lobes 8, need to be positioned and welded separately, which is time-consuming and prone to positioning errors. In addition, the multiple impeller lobes 8 are stamped, so they are suitable for impellers made of metal sheets, but not for impellers made of plastic. Because the impeller lobes 8 are required to include a rear cover plate lobe 3, blades 2, and a front cover plate lobe 1, the mold for the impeller lobes 8 is already complicated by injection molding. The scheme provided by the latter can be used for welding impellers made of plastic. However, first, welding ribs 6 must be provided on the surface of the molded blades 4, and welding grooves 3 matching the contour of the blades 4 are distributed on the inner side of the cover plate 1. Not only is the molding mold structure of the component complex, but the document does not disclose the corresponding welding fixture. It is unknown how to ensure a uniform weld along the length of the blade, so the welding quality is questionable. Summary of the invention

[0006] The primary purpose of the present invention is to provide an impeller, which ensures the welding quality of the connecting parts to ensure the overall quality of the impeller.

[0007] The primary purpose of the present invention is achieved by the following two technical solutions. One is that the impeller includes a base plate, blades and a cover plate, the base plate and the blades are integrally injection molded, the front side of the blade is a smooth surface, and the cover plate is welded to the front side of the blade; the second is that the impeller includes a base plate, blades and a cover plate, the cover plate and the blades are integrally injection molded, the rear side of the blade is a smooth surface, and the base plate is welded to the rear side of the blade.

[0008] Another object of the present invention is to provide a welding device for welding the above-mentioned impeller components to form a high-quality impeller.

[0009] The technical solution provided for this purpose is an impeller welding device, wherein a base plate clamp and a cover plate clamp for constraining and fixing the base plate and the cover plate are arranged on the frame, at least one of the base plate clamp and the cover plate clamp is arranged on the guide rail of the frame, and a mobile driving mechanism drives the base plate clamp and the cover plate clamp to move closer to or away from each other, and the frame is also provided with a heating plate, one side of the heating plate is a plate-type heating disk, and the other side is a blade-type heating plate, and the arrangement of the heating plate is consistent with the arrangement of the blades on the impeller, and the heating plates are respectively located in the area where the base plate clamp and the cover plate clamp are opposite to each other or deviate to the outside of the area where the base plate clamp and the cover plate clamp are opposite to each other.

[0010] The impeller provided by the present invention is composed of two unit components, that is, the blades and the base plate are injection molded as one and welded to the cover plate, or the blades and the cover plate are injection molded as one and welded to the base plate to form the impeller. Both structural forms are convenient for injection molding of each unit component. The structure of the unit component is independent and simple, and there is no need to set other parts on the side of the blade or to open grooves on the base plate and the cover plate, which simplifies the molding mold of the unit component and is also conducive to the melting of the material at the welding part to facilitate the contact and fusion of the unit component. In addition, the welding device of the present invention has a simple structure, accurate and reliable positioning, and the impeller welding product is easy to separate from the welding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1a , 1b and Figure 1c , 1d They are schematic diagrams of the structures of two exploded forms of the impeller component of the present invention;

[0012] Figure 2 It is the structural diagram of the impeller after processing;

[0013] Figure 3 It is a structural schematic diagram of the welding device in the present invention;

[0014] Figure 4 yes Figure 3 A right side view of the heating plate in FIG.

[0015] Figure 5 yes Figure 4 Left view of;

[0016] Figure 6 , 7 They are Figure 3 A partial enlarged schematic diagram is shown in the figure. DETAILED DESCRIPTION

[0017] Example

[0018] like Figure 3 As shown, the shape and structure of the impeller molded product are not substantially different from the prior art. The present invention first processes the unit components and then welds them to obtain the impeller product. There are two ways to construct the unit components, namely, the blade 2 is firstly injection-molded with the base plate 1 or the blade 2 and the cover plate 3, and then welded with another unit component.

[0019] like Figure 1a , 1b As shown, the impeller comprises a base plate 1 , blades 2 and a cover plate 3 , wherein the base plate 1 and the blades 2 are integrally injection molded, the front side surface 2 a of the blades 2 is a smooth surface, and the cover plate 3 is welded to the front side surface 2 a of the blades 2 .

[0020] like Figure 1c ,1d As shown, the cover plate 3 and the blade 2 are integrally injection-molded, and the bottom plate 1 is welded to the rear side surface 2b of the blade 2, and the rear side surface 2b is a smooth surface.

[0021] The so-called smooth surface mentioned above refers to a basically smooth plane or curved surface, and does not require additional significant convex or concave structures. Even if the surface has average smoothness or appropriate roughness, it is considered a smooth surface.

[0022] In both of the above schemes, the impeller is decomposed into two unit components and then welded into a product. The welded part is either the rear side 2b of the blade 2 or the front side 2a of the blade 2. The parts that need to be hot-melted are all convenient heating parts. The quality can be ensured by hot-melt welding. In particular, the above two unit component decomposition schemes are very conducive to the injection molding of each unit component. First, the molding mold is simple, and second, demoulding is easy. Example

[0023] like Figure 3 As shown, the impeller welding device, the frame 10 is provided with a base plate clamp 20 and a cover plate clamp 30 for constraining and fixing the base plate 1 and the cover plate 3, at least one of the base plate clamp 20 and the cover plate clamp 30 is arranged on the guide rail 11 of the frame 10, and the mobile driving mechanism drives the base plate clamp 20 and the cover plate clamp 30 to move closer to or away from each other, and the frame 10 is also provided with a heating plate 40, one side of the heating plate 40 is a plate-type heating disk 41, and the other side is a blade-type heating plate 42, and the arrangement of the heating plate 42 is consistent with the arrangement of the blades 2 on the impeller, and the heating plate 40 is respectively located in the area where the base plate clamp 20 and the cover plate clamp 30 are opposite to each other or deviate to the outside of the area where the base plate clamp 20 and the cover plate clamp 30 are opposite to each other.

[0024] The welding method adopted by the present invention is to first use the heating plate 40 to statically heat the blade 2 and the cover plate 3 respectively, then withdraw the heating plate 40, drive the blade 2 and the cover plate 3 to approach each other, and then wait for the molten areas of the two to fuse and cool into one to achieve welding.

[0025] In the present invention, the heating plate 40 includes two heating surfaces, one of which is a plate-type heating disk 41. The plate-type heating disk 41 can be a complete and continuous plane or curved surface, or a segmented plane or curved surface, as long as the heating surface thereon can correspond to the heating of the side part of the blade 2 located on the bottom plate 1. Of course, the heating surface has a curved surface that is consistent with the spatial posture of the side part of the blade 2. It can also be understood here that the contour of the disk-type heating surface 41 is consistent with the contour of the area where the side of the blade is located; the other side of the heating plate 40 is a blade-type heating plate 42, and the heating surface of the blade-type heating plate 42 is the side surface of the blade 421 thereon, which is completely consistent with the blade 2 on the product impeller and the connection area on the cover plate 3. That is to say, the melting area applied by the blade-type heating plate 42 on the cover plate 3 is the area that will contact the melting area of ​​the front side of the blade 2 in the future, and the rest of the cover plate 3 still maintains the initial molding state.

[0026] As a preferred solution, the heating plate 40 is connected to a bracket 43, and the lower ends of the bracket 43 have downwardly opening semicircular, V-shaped or U-shaped claws 431, and the claws 431 are respectively clamped on the horizontally parallel guide rails 11. Figure 3 As shown, the clamping claw 431 adopts the above-mentioned open shape, which is convenient for positioning with the guide rail 11 and for directly removing the heating plate 40 from the guide rail 11.

[0027] Another solution is to select the heating plate 40 to swing and rotate to avoid, that is, the heating plate 40 is connected to a bracket 43, and one end of the lower part of the bracket 43 has a semicircular, V-shaped or U-shaped claw 431 with an opening downward, and the claw 431 is respectively clamped on a horizontally parallel guide rail 11 with a circular cross section, and the other end has a connecting hole to rotate with another guide rail 11. This solution can be referred to Figure 3 , 4 , only one of the claws 431 is set as a sleeve.

[0028] like Figure 6 As shown, the bottom plate fixture 20 includes a positioning shaft 21, which is connected to the connecting hole on the bottom plate 1 through a key 212. The shaft end of the positioning shaft 21 has a threaded hole 211, and a bolt 213 is connected to the threaded hole 211. The bolt head of the bolt 213 presses against the step surface of the connecting hole on the bottom plate 1. The above solution reliably fixes the bottom plate 1, that is, the key 212 limits the circumferential rotation freedom of the bottom plate 1, and the bolt 213 limits the possibility of axial displacement of the bottom plate 1.

[0029] like Figure 4 As shown, the cover plate 3 also needs to ensure that its position and posture are fixed when heated and welded to the blade 2. The middle part of the cover plate fixture 30 is a tube body 31, and the protruding section of the tube body 31 has an external thread 311, which is connected to the threaded hole 3a in the middle of the cover plate 3.

[0030] First, the cover plate 3 is connected to the tube body 31 of the cover plate fixture 30. Since there is only axial force but no circumferential torque during heating, the position of the cover plate 3 on the cover plate fixture 30 remains stable.

[0031] After the heating plate 40 completes the melting of the welding parts of the cover plate 3 and the blade 2, the heating plate 40, the cover plate 3 and the bottom plate 1 are axially displaced to separate them from each other. Therefore, the circumferential positions of the cover plate 3 and the bottom plate 1 are still determined. After the heating plate 40 is offset and avoided, the cover plate 3 and the bottom plate 1 are axially displaced until they are in contact and the contact pressure is maintained. After the molten area is cooled and fused, they are connected as one.

[0032] In order to ensure good positioning and facilitate displacement, two horizontally parallel guide rails 11 are arranged between the two end supports of the frame 10 as shown in the figure, and two guide sleeves 22 and 32 are respectively provided at the lower part of the bottom plate clamp 20 and the cover plate clamp 30 to engage with the two guide rails 11 in an interlaced manner.

[0033] The two guide rails 11 are arranged at the same height, and the lower side of one of the guide rails 11 is a rack 111. The lower part of the cover clamp 30 is provided with a hand wheel 32, and the inner end of the wheel shaft 321 connected to the hand wheel 32 has a gear meshing with the rack 111 to form a moving drive mechanism.

[0034] After the cover plate 3 and the blade 2 are welded together and cooled, a long-rod hexagon socket is inserted from the outer end of the tube body 31 to the bolt 213, and the bolt 213 is unscrewed to release the axial constraint between the bottom plate 1 and the positioning shaft 21. The hand wheel 32 is turned to drive the cover plate fixture 30 to move to the right. Figure 3 , the bottom plate 1, the blades 2 and the cover plate 3 have moved to the right as a whole with the cover plate fixture 30, and the keyway and the key 212 on the connecting hole on the bottom plate 1 are disengaged, and then the impeller composed of the bottom plate 1, the blades 2 and the cover plate 3 is rotated, and the threaded hole 3a in the middle of the cover plate 3 on the impeller is separated from the protruding section of the tube body 31 by the external thread 311, and the impeller is easy to be disengaged from the welding device, thus realizing the wheel unloading process.

[0035] The above embodiment is described based on a solution in which the blades 2 are injection molded on the floor 1. If the blades 2 are injection molded on the cover plate 3, the above solution is still feasible, except that the shape of the heating surface of the plate-type heating disk 41 on the heating plate 40 and the blade side profile of the blade-type heating sheet 42 need to be appropriately modified. In addition, the heating object of the blade-type heating sheet 42 is the floor 1, and the heating object of the plate-type heating disk 41 is the blade side attached to the cover plate 3.

Claims

1. An impeller welding device, characterized in that: The impeller welding device is used for welding an impeller comprising a base plate (1), blades (2) and a cover plate (3), wherein the base plate (1) and the blades (2) of the impeller are integrally injection molded, the front side surface (2a) of the blades (2) is a smooth surface, and the cover plate (3) is welded to the front side surface (2a) of the blades (2), or the cover plate (3) and the blades (2) of the impeller are integrally injection molded, the rear side surface (2b) of the blades (2) is a smooth surface, and the base plate (1) is welded to the rear side surface (2b) of the blades (2); A bottom plate clamp (20) and a cover plate clamp (30) for restraining and fixing a bottom plate (1) and a cover plate (3) are arranged on a frame (10) of the impeller welding device; at least one of the bottom plate clamp (20) and the cover plate clamp (30) is arranged on a guide rail (11) of the frame (10); a moving drive mechanism drives the bottom plate clamp (20) and the cover plate clamp (30) to move toward or away from each other; the frame (10) is also provided with a heating plate (40); one side of the heating plate (40) is a plate-type heating disk (41), and the other side is a blade-type heating plate (42); the arrangement of the heating plate (42) is consistent with the arrangement of the blades (2) on the impeller; the heating plate (40) is respectively located in the area where the bottom plate clamp (20) and the cover plate clamp (30) are opposite to each other or deviate to the outside of the area where the bottom plate clamp (20) and the cover plate clamp (30) are opposite to each other; The heating plate (40) is connected to a bracket (43), and one end of the lower part of the bracket (43) is provided with a semicircular, V-shaped or U-shaped claw (431) with an opening facing downward, and the claw (431) is respectively clamped on a horizontally parallel guide rail (11) with a circular cross section, and the other end is connected to another guide rail (11) through a connecting hole to form an interlaced rotational fit; The base plate fixture (20) comprises a positioning shaft (21), the positioning shaft (21) being connected to a connecting hole on the base plate (1) via a key (212), a threaded hole (211) being provided at an end of the positioning shaft (21), a bolt (213) being connected to the threaded hole (211), and a bolt head of the bolt (213) being pressed against a stepped surface of the connecting hole on the base plate (1).

2. The impeller welding device according to claim 1, characterized in that: The middle part of the cover plate clamp (30) is a tube body (31), and the protruding section of the tube body (31) has an external thread (311), and the external thread (311) is connected to the second threaded hole (3a) in the middle part of the cover plate (3).

3. The impeller welding device according to claim 1, characterized in that: Two horizontally parallel guide rails (11) are arranged between the supports at both ends of the frame (10), and two guide sleeves (22) are respectively arranged at the lower parts of the bottom plate clamp (20) and the cover plate clamp (30) to engage with the two guide rails (11) in an interlaced manner.

4. The impeller welding device according to claim 3, characterized in that: The two guide rails (11) are arranged at the same height, the lower side of one of the guide rails (11) is a rack (111), the lower part of the cover plate clamp (30) is provided with a hand wheel (32), and the inner end of the wheel shaft (321) connected to the hand wheel (32) is provided with a gear which meshes with the rack (111), thereby forming a moving drive mechanism.

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