A welding fixture for centrifugal blowers

Abstract

This application discloses a welding fixture for a centrifugal blower impeller, comprising a frame, a support rotatably mounted on the frame, and a worktable rotatably mounted on the support. The worktable is equipped with a fixed column for mounting the impeller, a horizontal positioning device for horizontally positioning the impeller, and a vertical positioning device for restricting the vertical movement of the impeller. The horizontal positioning device includes multiple horizontal rods movably mounted within the fixed column and a power mechanism for moving the multiple horizontal rods. The fixed column has multiple horizontal holes, through which the horizontal rods abut against the inner circumferential wall of the impeller. This application effectively limits the movement of impellers of different specifications, ensuring the normal operation of multi-angle welding.

Description

Technical Field

[0001] This application relates to the technical field of impeller welding, and in particular to a welding fixture for centrifugal blowers. Background Technology

[0002] Currently, the term "impeller" refers to both the wheel disk equipped with moving blades and the general term for the disk and the rotating blades mounted on it. Impellers can be classified according to their shape and opening / closing configuration. As a key component of a fan, the rationality of its structural design directly affects the overall performance of the fan. During operation, the impeller rotates, driving gas flow and thus achieving gas delivery. The impeller is mainly welded together from the disk, cover, long and short blades, and inlet ring. According to the fan design requirements, a certain number of long and short blades are evenly welded between the disk and the cover. The space for welding operations is limited, therefore the placement of the impeller is crucial.

[0003] Chinese patent publication number CN115846992A discloses a welding fixture for a centrifugal blower impeller, comprising: a base; a fixing mechanism located on the outside of the base; and an adjusting mechanism located between the fixing mechanism and the base. The adjusting mechanism includes: a support assembly connected to the base; a control assembly connected to the support assembly and the fixing mechanism; a rotating assembly located between the fixing mechanism and the control assembly; and a positioning assembly connected to the support assembly and the control assembly. By setting the adjusting mechanism, the impeller can be adjusted at multiple angles during welding, facilitating the operator to find the optimal welding position, ensuring welding quality, reducing the operator's workload, and improving the welding efficiency of the impeller.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: Since the inner diameters of impellers of different specifications are not the same, when the impeller is fitted onto the outside of the lifting column, the inner diameter of the impeller does not match the outer diameter of the lifting column, which can easily cause the impeller to shift in position along the radial direction of the lifting column. Even if the pressure rod and positioning wheel press against the upper surface of the impeller, it is impossible to guarantee that the impeller will shift in position along the radial direction of the lifting column. Summary of the Invention

[0005] To address the issue of tooling being incompatible with impellers of different specifications, this application provides an impeller welding tooling for centrifugal blowers.

[0006] The impeller welding fixture for a centrifugal blower provided in this application adopts the following technical solution:

[0007] A welding fixture for the impeller of a centrifugal blower includes a frame, a support rotatably mounted on the frame, and a worktable rotatably mounted on the support.

[0008] The workbench is equipped with a fixed column for mounting the impeller, a horizontal positioning device for positioning the impeller in the horizontal direction, and a vertical positioning device for restricting the vertical movement of the impeller.

[0009] The horizontal positioning device includes multiple horizontal rods movably disposed within the fixed column and a power mechanism for realizing the movement of the multiple horizontal rods; the fixed column is provided with multiple horizontal holes, and the horizontal rods abut against the inner peripheral wall of the impeller after passing through the horizontal holes.

[0010] Optionally, the power mechanism includes multiple power sleeves, multiple power screws, and a transmission component that moves at intervals with the vertical positioning device. The power sleeves are threadedly connected to the power screws, and the power sleeves are rotatably connected to the inner cavity of the fixed column. The end of the power screw is fixedly connected to the tail end of the horizontal rod. The horizontal hole is set as a square hole, and the horizontal rod slides and adapts to the horizontal hole. The front end of the horizontal rod is initially located on the inner wall of the horizontal hole.

[0011] Optionally, the vertical positioning device includes a vertical ring slidably disposed outside the fixed column, a plurality of vertical rods movably disposed on the circumferential wall of the vertical ring, a drive mechanism for popping out the vertical rods, a circumferential positioning mechanism for limiting the circumferential movement of the impeller, and a power mechanism for controlling the vertical ring to move along the vertical direction. The power mechanism is connected to the transmission assembly. The circumferential wall of the vertical ring is provided with a plurality of vertical grooves, and the vertical ring is movably disposed in the vertical grooves.

[0012] Optionally, the driving mechanism includes a first electromagnet and a torsion spring. The vertical ring is rotatably disposed within the vertical groove, and the rotation axis of the vertical ring and the vertical groove are vertically aligned. The outer diameter of the vertical ring is smaller than the inner diameter of the impeller. The rotation axes of the vertical rod and the vertical groove are both located on the symmetrical plane of the corresponding sidewall of the vertical ring, i.e., in the middle of the vertical groove. The vertical rod moves to abut against the upper surface of the impeller. The first electromagnet is disposed at one end of the vertical groove corresponding to the movable end of the vertical rod and is used to attract the vertical rod. The torsion spring is used to connect the vertical rod to the inner wall of the vertical groove.

[0013] Optionally, the power mechanism includes a lead screw and a power block. The lead screw is rotatably connected to the top of the inner cavity of the fixed column, and the lead screw is helically engaged with the power block. A power groove is provided through the side wall of the fixed column, and the power block extends out of the power groove and is fixedly connected to the inner wall of the vertical ring.

[0014] Optionally, the transmission assembly includes multiple driven bevel gears, a driving bevel gear, a transmission motor, and an adjustment part for realizing the offset movement of the driving bevel gear and the vertical ring. The driving bevel gear is rotatably disposed on the inner wall of the fixed column, and the driven bevel gear is fixed on the outer wall of the power screw sleeve. The driving bevel gear is meshed with multiple driven bevel gears. The axis of the driving bevel gear is vertically arranged and the axis of the driven bevel gear is horizontally arranged.

[0015] Optionally, the adjustment unit includes a drive disk, a rotating disk, an adjusting electromagnet, and a friction transmission clutch that is raised and lowered on the drive disk. The drive disk is fixedly connected to the output end of the transmission motor, the rotating disk is fixedly connected to the driving bevel gear, the rotating disk is covered on the outside of the drive disk, the drive disk is rotatably connected to the tail end of the lead screw, and the adjusting electromagnet is disposed on the peripheral wall of the lead screw. The adjusting electromagnet is used to attract the drive disk. The friction transmission clutch is connected to the rotating disk through friction transmission. The driving bevel gear has a cavity in the middle, and the lead screw passes through the driving bevel gear and connects to the drive disk.

[0016] Optionally, the circumferential positioning mechanism includes an adhesive assembly disposed on the vertical rod and a detection assembly for determining whether the impeller is horizontal. The detection assembly includes multiple detection rods, detection electromagnets, detection blocks, and multiple proximity switches elastically disposed within the vertical rod. The bottom end of the detection rod abuts against the upper surface of the impeller, the detection electromagnet is attracted to the side wall of the detection rod, the detection block is fixed to the side wall of the detection rod, the vertical rod is provided with multiple detection holes, and the detection rod is elastically disposed within the detection holes. When the proximity switch abuts against the detection block, the proximity switch controls an adjacent first electromagnet to de-energize, that is, multiple proximity switches take turns controlling the next first electromagnet to de-energize along one direction.

[0017] Optionally, the bonding assembly includes an operating cavity, a plurality of bladders movably disposed within the operating cavity, a processing section for puncturing the bladders, and a softening section, wherein the bladders are filled with adhesive, and the softening section is used to quickly soften the adhesive.

[0018] Optionally, the processing unit includes a needle and barbs. The needle is inclined and is inclined along the positive direction of the movement of the sac. The barbs are fixed on the needle and are inclined in the opposite direction to the needle.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. When horizontal rod movement is required, the control electromagnet is separated from the drive plate, and the lead screw is rotated and connected to the drive plate. At this time, the control friction transmission clutch moves to contact the bottom of the rotating plate. At this time, the rotating plate and the drive plate rotate together through friction. When the driving bevel gear rotates clockwise, the horizontal rod passes out from the horizontal hole. During the movement of the horizontal rod, if the impeller is not coaxial with the fixed column, the horizontal rod also plays a role in pushing the impeller. In addition, under the action of the contact and squeezing friction between the four horizontal rods and the inner circumferential wall of the impeller, the impeller is restricted in its radial direction.

[0021] 2. When the vertical ring needs to start moving downwards, the control electromagnet contacts the drive plate, the drive plate and the lead screw rotate together, and the friction transmission clutch separates from the rotating plate. When the transmission motor rotates counterclockwise, the power block drives the vertical ring to move downwards, and the vertical rod pops outwards until it abuts against the upper surface of the impeller. When the vertical rod is in contact with the impeller surface, the detection electromagnet is removed from the detection rod. Under the elastic force of the spring, if the detection rod does not move, the vertical rod is in contact with the upper surface of the impeller. As long as the detection rod moves downwards, the proximity switch will separate from the detection block, and the first electromagnet will be triggered to separate from the vertical rod. Then the next vertical rod will not pop out. According to the specific shape of the impeller, if the impeller is not level, this embodiment sets at least two vertical rods to not be in contact with the upper surface of the impeller. At this time, the vertical rod will definitely not pop out, which proves that the impeller is not horizontal and needs to be adjusted. When all four vertical rods pop out, it proves that the impeller is horizontal.

[0022] 3. When adhesive bonding is required, the winding rope pulls the bladder into the operating chamber until it contacts the needle. The needle is tilted and inserted into the bladder until it passes through. Finally, the winding rope is pulled back, and the bladder is cut open by the barbs. The adhesive flows quickly to the operating chamber and the peripheral walls of the vertical rod and impeller. In this embodiment, the winding rope is not bonded. After the adhesive cures, the vertical rod and the upper surface of the impeller are bonded, achieving a circumferential restriction effect on the impeller. If it is necessary to separate the vertical rod and the impeller, the softening bladder is pulled into the operating chamber. Similarly, the softening bladder is divided by the action of the needle and barbs, and the softening agent is left in the adhesive position. At this time, the connection between the vertical rod and the impeller is loosened, and the vertical ring and the vertical rod can be separated from the impeller. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the fixed column, horizontal positioning device, and vertical positioning device in the embodiments of this application;

[0025] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0026] Reference numerals: 1. Frame; 2. Support; 3. Workbench; 4. Fixed column; 5. Horizontal bar; 6. Horizontal hole; 7. Power screw; 8. Power screw sleeve; 9. Vertical ring; 10. Vertical rod; 11. Vertical groove; 12. First electromagnet; 13. Torsion spring; 14. Lead screw; 15. Power block; 16. Driven bevel gear; 17. Driven bevel gear; 18. Transmission motor; 19. Drive disc; 20. Rotating disc; 21. Adjusting electromagnet; 22. Friction transmission clutch; 23. Detection rod; 24. Detection electromagnet; 25. Detection block; 26. Proximity switch; 27. Detection hole; 28. Spring; 29. ​​Operating chamber; 30. Leather bag; 31. Winding roller; 32. Winding rope; 33. Needle; 34. Barb; 35. Softening bag. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0028] This application discloses an impeller welding fixture for a centrifugal blower. (Refer to...) Figures 1-3 A welding fixture for impellers of centrifugal blowers includes a frame 1, a support 2 rotatably mounted on the frame 1, and a worktable 3 rotatably mounted on the support 2. Both the support 2 and the worktable 3 are controlled by servo motors. The support 2 rotates in the horizontal direction, and the worktable 3 rotates in the vertical direction. That is, the rotation axis of the support 2 is set vertically, and the rotation axis of the worktable 3 is set horizontally, so as to achieve the multi-angle rotation effect of the impeller during the welding process.

[0029] The workbench 3 is equipped with a fixed column 4 for mounting the impeller, a horizontal positioning device for positioning the impeller horizontally, and a vertical positioning device for restricting the vertical movement of the impeller. In this embodiment, the size of the fixed column 4 is smaller than the minimum size of the batch of impellers, thus ensuring that all impellers can be mounted on the outside of the fixed column 4. The cross-section of the fixed column 4 can be circular or square, and in this embodiment, it is preferably square. The horizontal positioning device restricts the radial direction of the impeller, while the vertical positioning device restricts the axial direction of the impeller.

[0030] The horizontal positioning device includes multiple horizontal rods 5 movably disposed within a fixed column 4 and a power mechanism for moving the multiple horizontal rods 5. The fixed column 4 is provided with multiple horizontal holes 6. The horizontal rods 5 pass through the horizontal holes 6 and abut against the inner circumferential wall of the impeller. There are four or two horizontal rods 5, preferably four. The interior of the fixed column 4 is set as a cavity, and the horizontal holes 6 communicate with the inner cavity. The power mechanism includes multiple power sleeves 8, multiple power screws 7, and a transmission assembly that moves at intervals with the vertical positioning device. The power sleeves 8 are threadedly connected to the power screws 7 and are rotatably connected to the inner cavity of the fixed column 4. The end of the power screw 7 is fixedly connected to the tail end of the horizontal rod 5. The horizontal holes 6 are set as square holes, and the horizontal rods 5 slide and adapt to the horizontal holes 6. The front end of the horizontal rod 5 is initially located on the inner wall of the horizontal hole 6. Similarly, there are also four power sleeves 8 and four power screws 7. The transmission assembly is used to achieve vertical and horizontal limiting of the impeller, which are staggered. In this embodiment, the radial direction of the power sleeves 8 is first limited, and then the axial direction of the impeller is limited.

[0031] First, the impeller is sleeved outside the fixed column 4. Alternatively, the power screw sleeve 8 can be driven to rotate via the transmission assembly. Since the rotation of the horizontal rod 5 is restricted by the horizontal hole 6, the power screw sleeve 8 drives the power screw 7 to move along the length direction of the horizontal hole 6, thereby achieving the driving effect of the power screw 7. Furthermore, the backward extensions of the four horizontal rods 5 intersect at a point located on the axis of the fixed column 4. Therefore, under the positioning effect of the four horizontal rods 5, the axis of the impeller is coaxial with the axis of the fixed column 4, thus ensuring the accuracy of the welding. In addition, during the movement of the horizontal rods 5, if the impeller is not coaxial with the fixed column 4, the horizontal rods 5 also play a role in pushing the impeller. Under the action of the contact and squeezing friction between the four horizontal rods 5 and the inner circumferential wall of the impeller, the impeller is restricted in its radial direction.

[0032] The transmission assembly includes multiple driven bevel gears 16, a driving bevel gear 17, a drive motor 18, and an adjustment part for achieving the staggered movement of the driving bevel gear 17 and the vertical ring 9. The driving bevel gear 17 is rotatably mounted on the inner wall of the fixed column 4, and the driven bevel gears 16 are fixed on the outer wall of the power sleeve 8. The driving bevel gear 17 is meshed with multiple driven bevel gears 16. The axis of the driving bevel gear 17 is vertical, and the axis of the driven bevel gears 16 is horizontal. There are also four driven bevel gears 16, which are ring-shaped and fixed to the outer wall of the power sleeve 8. The number of teeth of the driving bevel gear 17 is greater than the sum of the number of teeth of the four driven bevel gears 16, meaning that the four driven bevel gears 16 are evenly distributed outside the axis of the driving bevel gear 17. As long as the drive motor 18 controls the rotation of the driving bevel gear 17 through the adjustment part, the four driven bevel gears 16 can rotate simultaneously. In this embodiment, the four power screw sleeves 8 are respectively matched with the four corresponding power screws 7. When the driving bevel gear 17 rotates clockwise, the power screw 7 drives the horizontal rod 5 to move outward. Similarly, when the driving bevel gear 17 moves counterclockwise, the horizontal rod 5 moves inward.

[0033] The vertical positioning device includes a vertical ring 9 slidably disposed outside the fixed column 4, multiple vertical rods 10 movably disposed on the periphery of the vertical ring 9, a drive mechanism for popping out the vertical rods 10, a circumferential positioning mechanism for restricting the circumferential movement of the impeller, and a power mechanism for controlling the vertical ring 9 to move in the vertical direction. The power mechanism is connected to the transmission assembly. The periphery of the vertical ring 9 is provided with multiple vertical grooves 11, and the vertical ring 9 is movably disposed in the vertical grooves 11. The cross-section of the vertical ring 9 is also set to be square. Similarly, the cross-sectional dimension of the vertical ring 9 is smaller than the minimum inner diameter of the impellers in this batch, so that the vertical ring 9 can move freely. The central axis of the vertical ring 9 is coaxial with the central axis of the fixed column 4. At the same time, the length dimension of the vertical rod 10 is set to be larger than the maximum inner diameter of the impellers in this batch, that is, to ensure that the vertical rod 10 can fit against the upper end face of the impeller.

[0034] The driving mechanism includes a first electromagnet 12 and a torsion spring 13. A vertical ring 9 is rotatably disposed within a vertical groove 11, and the rotation axes of the vertical ring 9 and the vertical groove 11 are vertically aligned. The outer diameter of the vertical ring 9 is smaller than the inner diameter of the impeller. The rotation axes of the vertical rod 10 and the vertical groove 11 are both located on the symmetrical plane of the corresponding sidewall of the vertical ring 9, i.e., at the middle position of the vertical groove 11. The vertical rod 10 moves to abut against the upper surface of the impeller. The first electromagnet 12 is disposed at one end of the vertical groove 11 corresponding to the movable end of the vertical rod 10 and is used to attract the vertical rod 10. The torsion spring 13 is used to connect the vertical rod 10. The vertical rod 10 is aligned with the inner wall of the vertical groove 11. The depth of the vertical groove 11 is greater than the thickness of the vertical rod 10, allowing the vertical rod 10 to be completely positioned within the vertical groove 11. This prevents the vertical rod 10 from interfering with the impeller installation. When the vertical rod 10 needs to extend, the attraction between the first electromagnet 12 and the vertical rod 10 is disconnected. Under the elastic force of the torsion spring 13, the vertical rod 10 swings outward until it aligns with the inner wall of the end of the vertical groove 11. At this point, the vertical rod 10 is perpendicular to the plane of the vertical ring 9. Simultaneously, the four vertical rods 10 are symmetrical about each other relative to the central axis of the vertical ring 9.

[0035] The power mechanism includes a lead screw 14 and a power block 15. The lead screw 14 is rotatably connected to the top of the inner cavity of the fixed column 4. The lead screw 14 and the power block 15 are screw-fitted. A power groove is provided through the side wall of the fixed column 4. After the power block 15 extends out of the power groove, it is fixedly connected to the inner wall of the vertical ring 9. The cross section of the power groove is also set as rectangular. During the rotation of the lead screw 14, the rotation of the power block 15 is restricted. The power block 15 drives the vertical ring 9 to move in the vertical direction. The power groove can be set as multiple, only increasing the position where the power block 15 is connected to the inner wall of the vertical ring 9. In this embodiment, the rotation of the lead screw 14 and the movement of the active bevel gear 17 need to be staggered. That is, the active bevel gear 17 moves first, and after the horizontal rod 5 is extended, the vertical ring 9 can be separated from the impeller. Finally, after the vertical rod 10 is retracted, the welded impeller can be taken out.

[0036] The adjustment unit includes a drive disk 19, a rotating disk 20, an adjusting electromagnet 21, and a friction transmission clutch 22 that is raised and lowered on the drive disk 19. The drive disk 19 is fixedly connected to the output end of the drive motor 18, and the rotating disk 20 is fixedly connected to the driving bevel gear 17. The rotating disk 20 covers the outside of the drive disk 19. The drive disk 19 is rotatably connected to the tail end of the lead screw 14, and the adjusting electromagnet 21 is disposed on the peripheral wall of the lead screw 14. The adjusting electromagnet 21 is used to attract the drive disk 19. The friction transmission clutch 22 and the rotating disk 20 are connected by friction. The middle part of the driving bevel gear 17 is hollow, and the lead screw 14 passes through the driving bevel gear 17. Connected to the drive disk 19, both the friction transmission clutch 22 and the rotating disk 20 are ring-shaped. The rotating disk 20 is located below the active electromagnet, while the friction sensor clutch is raised and lowered above the drive disk 19 via an electric push rod. In this embodiment, a single drive motor 18 is used instead of two power sources to control the lead screw 14 and the active bevel gear 17 respectively. This is primarily to save costs, secondly to ensure more stable mechanical transmission, and finally, if the lead screw 14 also requires a power source, it would need to pass through the power source located above the fixed column 4 used to control the lead screw 14 during the impeller installation process, which could easily damage the power source.

[0037] When the horizontal rod 5 needs to move, the control adjustment electromagnet 21 is disengaged from the drive disk 19, and the lead screw 14 is rotatably connected to the drive disk 19. At this time, the control friction transmission clutch 22 is moved to contact the bottom of the rotating disk 20. At this time, the rotating disk 20 and the drive disk 19 rotate together through friction. When the driving bevel gear 17 rotates clockwise, the horizontal rod 5 passes through the horizontal hole 6. When the vertical ring 9 needs to start moving downward, the control adjustment electromagnet 21 is contacted with the drive disk 19, and the drive disk 19 and the lead screw 14 rotate together. The friction transmission clutch 22 is disengaged from the rotating disk 20. When the drive motor 18 rotates counterclockwise, the power block 15 drives the vertical ring 9 to move downward. Similarly, when the horizontal rod 5 and the vertical ring 9 need to return to the initial position, the above operation is reversed. This embodiment will not be described in detail.

[0038] The circumferential positioning mechanism includes an adhesive assembly movably mounted on a vertical rod 10 and a detection assembly for determining whether the impeller is horizontal. The detection assembly includes multiple detection rods 23 elastically mounted within the vertical rod 10, a detection electromagnet 24, a detection block 25, and multiple proximity switches 26. The bottom end of the detection rod 23 abuts against the upper surface of the impeller. The detection electromagnet 24 attracts the side wall of the detection rod 23. The detection block 25 is fixed to the side wall of the detection rod 23. The vertical rod 10 is provided with multiple detection holes 27, and the detection rod 23 is elastically mounted within the detection holes 27. When the proximity switch 26 comes into contact with the detection block 25, the proximity switch 26 controls the adjacent first electromagnet 12 to de-energize. That is, multiple proximity switches 26 take turns controlling the next first electromagnet 12 to de-energize in one direction. After the impeller is placed, due to the friction between the horizontal rod 5 and the impeller and the need for the horizontal rod 5 to push the impeller for adjustment, the impeller may not be in a horizontal state. Therefore, it is necessary to adjust whether the impeller is horizontal. The upper end of the detection hole 27 is closed and the lower end is open. The end of the detection rod 23 is connected to the corresponding end of the detection hole 27 by a spring 28.

[0039] In the initial state, the detection rod 23 is attracted by the detection electromagnet 24, and the bottom end of the detection rod 23 is located inside the detection hole 27. The spring 28 is compressed. At this time, the proximity switch 26 also contacts the detection block 25. When the vertical rod 10 is in contact with the impeller surface, the attraction of the detection electromagnet 24 to the detection rod 23 is removed. Under the elastic force of the spring 28, if the detection rod 23 does not move, the vertical rod 10 will be in contact with the upper surface of the impeller. As long as the detection rod 23 moves downward, the proximity switch 26 will separate from the detection block 25, and the first electromagnet 12 will be triggered to separate from the vertical rod 10. Then the next vertical rod 10 will not pop out. According to the specific shape of the impeller, as long as the impeller is not level, this embodiment sets at least two vertical rods 10 will not be in contact with the upper surface of the impeller. At this time, the vertical rod 10 will definitely not pop out, which proves that the impeller is not horizontal and needs to be adjusted. When all four vertical rods 10 pop out, it proves that the impeller is horizontal.

[0040] The horizontal rod 5 restricts the impeller radially, and the vertical rod 10 restricts the impeller axially, but the circumferential rotation of the impeller is not restricted. The bonding assembly is used to further restrict the circumferential rotation of the impeller by the vertical rod 10. The bonding assembly includes an operating chamber 29, multiple bladders 30 movably disposed within the operating chamber 29, a processing section for puncturing the bladders 30, and a softening section. The bladders 30 are filled with adhesive, and the softening section is used to quickly soften the adhesive. The operating chamber 29 also has an opening on the side facing the impeller. Both ends of 29 are provided with operating chambers 29, and a winding roller 31 is rotatably installed in each of the two operating chambers 29. Multiple bladders 30 are connected by a winding rope 32. The two ends of the winding rope 32 are fixedly connected to the peripheral walls of the two winding rollers 31 respectively. The rotation of the winding rollers 31 is achieved by a winding motor. In the initial state, there are no bladders 30 in the operating chambers 29. Only when it is necessary to bond the vertical rod 10 to the impeller, it is necessary to control the rotation of the winding rollers 31 and move the bladders 30 into the operating chambers 29.

[0041] The processing unit includes a needle 33 and barbs 34. The needle 33 is inclined and tilted along the positive direction of movement of the bladder 30. The barbs 34 are fixed to the needle 33, and their tilt direction is opposite to that of the needle 33. The softening unit includes multiple softening bladders 35, which are filled with a softening agent for softening adhesive. The softening bladders 35 are spaced apart from the bladder 30 and are also tied to a winding rope 32. When adhesive bonding is required, the winding rope 32 pulls the bladder 30 into the operating chamber 29 until it contacts the needle 33. The needle 33, tilted, can then pierce into the bladder 30 until it passes through the bladder 30. Finally, the winding rope is untied. 32 is pulled back, and under the action of the barbs 34, the bladder 30 is cut open, and the glue flows quickly to the operating chamber 29 and the peripheral wall of the vertical rod 10 and the impeller. In this embodiment, the winding rope 32 is set to not be glued. After the glue cures, the adhesion effect between the vertical rod 10 and the upper surface of the impeller can be achieved, thus achieving the circumferential restriction effect on the impeller. If it is necessary to separate the vertical rod 10 and the impeller, the softening bladder 35 is pulled into the operating chamber 29. Similarly, under the action of the needles 33 and the barbs 34, the softening bladder 35 is divided, and the softener is left in the glue position. At this time, the connection between the vertical rod 10 and the impeller is loosened, and the vertical ring 9 and the vertical rod 10 can be separated from the impeller.

[0042] The implementation principle of a welding fixture for a centrifugal blower impeller in this application embodiment is as follows: When the horizontal rod 5 needs to move, the control adjustment electromagnet 21 is separated from the drive disk 19, and the lead screw 14 is rotatably connected to the drive disk 19. At this time, the control friction transmission clutch 22 moves to contact the bottom of the rotating disk 20. At this time, the rotating disk 20 and the drive disk 19 rotate together through friction. When the active bevel gear 17 rotates clockwise, the horizontal rod 5 passes through the horizontal hole 6. During the movement of the horizontal rod 5, if the impeller is not coaxial with the fixed column 4, the horizontal rod 5 also plays a role in pushing the impeller. In addition, under the action of the contact and squeezing friction between the four horizontal rods 5 and the inner peripheral wall of the impeller, the impeller is restricted in its radial direction.

[0043] When the vertical ring 9 needs to start moving downwards, the control electromagnet 21 contacts the drive disc 19, causing the drive disc 19 and lead screw 14 to rotate together. Meanwhile, the friction drive clutch 22 disengages from the rotating disc 20, and the drive motor 18 rotates counterclockwise. At this time, the power block 15 drives the vertical ring 9 to move downwards, and the vertical rod 10 pops outwards until it contacts the upper surface of the impeller. When the vertical rod 10 contacts the impeller surface, the detection electromagnet 24 removes its attraction to the detection rod 23. If the detection rod 23 does not move under the elastic force of the spring 28, then the vertical ring 9... The vertical rod 10 is in contact with the upper surface of the impeller. As long as the detection rod 23 moves downward, the proximity switch 26 will separate from the detection block 25, and the first electromagnet 12 will be triggered to separate from the vertical rod 10. Then the next vertical rod 10 will not pop out. According to the specific shape of the impeller, as long as the impeller is not level, this embodiment sets at least two vertical rods 10 to not be in contact with the upper surface of the impeller. At this time, the vertical rod 10 will definitely not pop out, which proves that the impeller is not level and needs to be adjusted. When all four vertical rods 10 pop out, it proves that the impeller is level.

[0044] When adhesive bonding is required, the winding rope 32 pulls the bladder 30 into the operating chamber 29 until it contacts the needle 33. The needle 33 is tilted and can pierce into the bladder 30 until it passes through the bladder 30. Finally, the winding rope 32 is pulled back, and the bladder 30 is cut open under the action of the barbs 34. The adhesive flows quickly to the operating chamber 29 and the peripheral wall of the vertical rod 10 and the impeller. In this embodiment, the winding rope 32 is not bonded. After the adhesive cures, the bonding effect between the vertical rod 10 and the upper surface of the impeller can be achieved, thus achieving the circumferential restriction effect on the impeller. If it is necessary to separate the vertical rod 10 and the impeller, the softening bladder 35 is pulled into the operating chamber 29. Similarly, under the action of the needle 33 and the barbs 34, the softening bladder 35 is divided, and the softener is left in the adhesive position. At this time, the connection between the vertical rod 10 and the impeller is loosened, and the vertical ring 9 and the vertical rod 10 can be separated from the impeller.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A welding fixture for the impeller of a centrifugal blower, characterized in that: It includes a frame (1), a support (2) rotatably mounted on the frame (1), and a worktable (3) rotatably mounted on the support (2); The workbench (3) is provided with a fixed column (4) for mounting the impeller, a horizontal positioning device for positioning the impeller in the horizontal direction, and a vertical positioning device for restricting the vertical movement of the impeller. The horizontal positioning device includes multiple horizontal rods (5) movably disposed within the fixed column (4) and a power mechanism for realizing the movement of the multiple horizontal rods (5); the fixed column (4) is provided with multiple horizontal holes (6), and the horizontal rods (5) abut against the inner peripheral wall of the impeller after passing through the horizontal holes (6); The power mechanism includes multiple power sleeves (8), multiple power screws (7), and a transmission component that moves at intervals with the vertical positioning device. The power sleeves (8) are threadedly connected to the power screws (7), and the power sleeves (8) are rotatably connected to the inner cavity of the fixed column (4). The end of the power screw (7) is fixedly connected to the tail end of the horizontal rod (5). The horizontal hole (6) is set as a square hole. The horizontal rod (5) slides and adapts to the horizontal hole (6). The front end of the horizontal rod (5) is initially located on the inner wall of the horizontal hole (6). The vertical positioning device includes a vertical ring (9) slidably disposed outside the fixed column (4), a plurality of vertical rods (10) movably disposed on the periphery of the vertical ring (9), a drive mechanism for popping out the vertical rods (10), a circumferential positioning mechanism for limiting the circumferential movement of the impeller, and a power mechanism for controlling the vertical ring (9) to move along the vertical direction. The power mechanism is connected to the transmission assembly. The periphery of the vertical ring (9) is provided with a plurality of vertical grooves (11), and the vertical rods (10) are movably disposed in the vertical grooves (11). The power mechanism includes a lead screw (14) and a power block (15). The lead screw (14) is rotatably connected to the top of the inner cavity of the fixed column (4). The lead screw (14) and the power block (15) are screwed together. A power groove is provided through the side wall of the fixed column (4). The power block (15) extends out of the power groove and is fixedly connected to the inner wall of the vertical ring (9). The transmission assembly includes multiple driven bevel gears (16), a driving bevel gear (17), a transmission motor (18), and an adjustment part for realizing the staggered movement of the driving bevel gear (17) and the vertical ring (9). The driving bevel gear (17) is rotatably disposed on the inner wall of the fixed column (4). The driven bevel gears (16) are fixed to the outer wall of the power sleeve (8). The driving bevel gear (17) is meshed with multiple driven bevel gears (16). The axis of the driving bevel gear (17) is vertically arranged and the driven bevel gears (16) are meshed together. 6) The axis direction is horizontal; the adjustment part includes a drive disk (19), a rotating disk (20), an adjusting electromagnet (21), and a friction transmission clutch (22) that is raised and lowered on the drive disk (19). The drive disk (19) is fixedly connected to the output end of the transmission motor (18). The rotating disk (20) is fixedly connected to the active bevel gear (17). The rotating disk (20) covers the outside of the drive disk (19). The drive disk (19) is rotatably connected to the tail end of the lead screw (14), and the adjusting electromagnet (21) is set on the peripheral wall of the lead screw (14). The adjusting electromagnet (21) is used to attract the drive disk (19). The friction transmission clutch (22) is connected to the rotating disk (20) through friction transmission. The middle part of the active bevel gear (17) is hollow. The lead screw (14) passes through the active bevel gear (17) and is connected to the drive disk (19).

2. The impeller welding fixture for a centrifugal blower according to claim 1, characterized in that: The driving mechanism includes a first electromagnet (12) and a torsion spring (13). The vertical rod (10) is rotatably disposed in the vertical groove (11), and the vertical ring (9) and the vertical groove (11) are vertically arranged. The outer diameter of the vertical ring (9) is smaller than the inner diameter of the impeller. The axis of the vertical rod (10) and the vertical groove (11) is located in the middle of the vertical groove (11). The vertical rod (10) moves to abut against the upper surface of the impeller. The first electromagnet (12) is disposed at one end of the vertical groove (11) corresponding to the movable end of the vertical rod (10) and is used to attract the vertical rod (10). The torsion spring (13) is used to connect the vertical rod (10) and the inner wall of the vertical groove (11).

3. The impeller welding fixture for a centrifugal blower according to claim 2, characterized in that: The circumferential positioning mechanism includes an adhesive assembly disposed on the vertical rod (10) and a detection assembly for determining whether the impeller is horizontal. The detection assembly includes multiple detection rods (23), detection electromagnets (24), detection blocks (25), and multiple proximity switches (26) elastically disposed within the vertical rod (10). The bottom end of the detection rod (23) abuts against the upper surface of the impeller. The detection electromagnet (24) is attracted to the side wall of the detection rod (23). The detection block (25) is fixed to the side wall of the detection rod (23). The vertical rod (10) is provided with multiple detection holes (27). The detection rod (23) is elastically disposed within the detection holes (27). When the proximity switch (26) abuts against the detection block (25), the proximity switch (26) controls an adjacent first electromagnet (12) to de-energize. That is, multiple proximity switches (26) take turns controlling the next first electromagnet (12) to de-energize along one direction.

4. The impeller welding fixture for a centrifugal blower according to claim 3, characterized in that: The bonding assembly includes an operating cavity (29), a plurality of bladders (30) movably disposed within the operating cavity (29), a processing section for puncturing the bladders (30), and a softening section. The bladders (30) are filled with adhesive, and the softening section is used to quickly soften the adhesive.

5. The impeller welding fixture for a centrifugal blower according to claim 4, characterized in that: The processing unit includes a needle (33) and a barb (34). The needle (33) is inclined and is inclined along the positive direction of movement of the sac (30). The barb (34) is fixed on the needle (33) and the barb (34) is inclined in the opposite direction to the needle (33).

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