An exhaust fan impeller press forming device

Abstract

This invention discloses a stamping and forming device for exhaust fan impellers, relating to the field of exhaust fan processing technology. The device includes a stamping table, with a lower mold fixedly mounted on the top and center of the stamping table. The top of the lower mold has four sets of forming grooves evenly distributed in a ring. An L-shaped seat extending upwards and forwards is fixedly mounted on the rear outer surface of the stamping table. A hydraulic rod is fixedly mounted on the top of the L-shaped seat, with the free end of the hydraulic rod penetrating the L-shaped seat and fixedly mounting an upper mold. This exhaust fan impeller stamping and forming device, through a detachable punch mechanism, allows for easy replacement of individual punches after wear. Simply lift the handle to move the annular plate upwards, causing the positioning rod to exit the positioning hole. The punch's slider then slides horizontally out of the groove opening for removal. Once a new punch slides in, releasing the handle automatically resets and locks it in place. The entire replacement process is manual and tool-free, and the replacement of a single punch takes only a few seconds.

Description

Technical Field

[0001] This invention relates to the field of exhaust fan processing technology, and in particular to an exhaust fan impeller stamping and forming device. Background Technology

[0002] The exhaust fan impeller stamping forming device uses annularly arranged punches on the upper die to simultaneously stamp all blades in one go, offering advantages such as high production efficiency and good product consistency. However, after prolonged use, some punches on the upper die may wear or chip due to continuous stamping impact, requiring replacement to maintain stamping accuracy and product quality. Some existing stamping dies have integral punch structures, with the punches directly fixed to the upper die base and not easily disassembled. For example, Chinese patent document CN206810940U discloses a one-time forming wind turbine stamping die, comprising a die and a punch. The die has stamping teeth arranged vertically and equidistantly along the circumference of its inner wall, and the punch has stamping teeth arranged vertically and equidistantly along the outer wall of its upper end, matching the stamping clearance of the die. This allows for the one-time stamping of the finished wind turbine.

[0003] However, the stamping teeth of this device and some existing devices are integrated with the mold body. After a single stamping tooth is worn or chipped, it cannot be disassembled and replaced individually. The entire mold needs to be disassembled and repaired or replaced as a whole, resulting in long downtime and high maintenance costs. Therefore, this invention proposes a stamping and forming device for exhaust fan impellers. Summary of the Invention

[0004] The purpose of this invention is to provide a stamping and forming device for exhaust fan impellers, which can solve the problem that after long-term use, individual punches of the annularly arranged punches of the upper die wear or chip, and that the traditional integral upper die requires the entire set to be replaced or disassembled for repair, resulting in long downtime.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stamping and forming device for an exhaust fan impeller, comprising: A stamping table has a lower die fixedly installed on its top and at its center. The top of the lower die has four sets of forming grooves that are evenly distributed in a ring. An L-shaped seat that extends upward and forward is fixedly installed on the rear outer surface of the stamping table. A hydraulic rod is fixedly installed on the top of the L-shaped seat. The free end of the hydraulic rod passes through the L-shaped seat and is fixedly installed with an upper die. The material pusher mechanism is located on the stamping table and is used to collect the formed parts. The demolding mechanism is located at the bottom of the stamping table and is used to demold the molded part. The limiting mechanism is located on the front side of the stamping table and is used for limiting movement. A detachable punch mechanism is installed on the upper mold. The detachable punch mechanism includes a slide, a punch, and a slider. The bottom of the upper mold has four sets of slides that are evenly distributed in a ring. The openings of the four sets of slides are located on the outer surface of the upper mold. A set of punches is fitted to the bottom of the upper mold at each slide. A set of sliders is fixedly installed on the top of each set of punches. Each set of sliders is horizontally slidably installed in the corresponding slide.

[0006] Preferably, the detachable punch mechanism further includes an annular plate, positioning rods, positioning holes, limiting rods, end plates, first springs, and handles. The annular plate is fitted to the top of the upper mold. Four sets of positioning rods are fixedly installed at the bottom of the annular plate and are evenly distributed in a ring. Each of the four sets of sliders has a set of positioning holes at its top. The four sets of positioning rods extend through the upper mold to the corresponding slide grooves and are inserted into the corresponding positioning holes. Four sets of limiting rods are fixedly installed at the top of the upper mold and are evenly distributed in a ring. The annular plate is movably sleeved on each set of limiting rods. One end of each set of limiting rods is fixedly installed with a set of end plates. Each set of limiting rods is sleeved with a set of first springs. One end of each set of first springs is fixedly connected to the top of the annular plate, and the other end of each set of first springs is fixedly connected to the corresponding end plates. A handle is fixedly installed on the top of the annular plate.

[0007] Preferably, the pushing mechanism includes a strip groove, a lead screw, a servo motor, an L-shaped plate, and an arc-shaped push plate. The strip groove is provided on the top of the stamping table and on one side of the lower mold. The lead screw is rotatably installed between the inner walls of the two sides of the strip groove. The servo motor is fixedly installed on the outer surface of one side of the stamping table. The shaft of the servo motor is connected to the lead screw for transmission. The L-shaped plate is threaded on the lead screw. One end of the L-shaped plate is slidably installed in the strip groove. The other end of the L-shaped plate is fixedly installed on the arc-shaped push plate directly above the stamping table. The arc-shaped push plate is located on one side of the lower mold, and the bottom of the arc-shaped push plate is flush with the top of the lower mold.

[0008] Preferably, the demolding mechanism includes a groove, a fixed plate, an electric push rod, a support plate, and ejector pins. The bottom of the stamping table has a groove, and a fixed plate is fixedly installed on the inner wall of the groove. An electric push rod is fixedly installed on the bottom of the fixed plate. The free end of the electric push rod passes through the fixed plate and is fixedly installed on the support plate. Four sets of ejector pins are fixedly installed on the top of the support plate and are evenly distributed in a ring. Each set of ejector pins extends through the stamping table into the corresponding forming groove, and the top of each set of ejector pins is flush with the inner bottom of the corresponding forming groove.

[0009] Preferably, the limiting mechanism includes a housing, a limiting plate, and a second spring. A placement groove is provided on the top of the stamping table and on the other side of the lower mold. The placement groove is opened to the front side of the stamping table, and a collection box is placed in the placement groove. A housing is fixedly installed on the outer surface of the front side of the stamping table. A limiting plate is slidably installed inside the housing. Two sets of second springs are fixedly installed between the bottom of the limiting plate and the bottom of the inner side of the housing. The limiting plate is in contact with the outer surface of the front side of the collection box.

[0010] Preferably, a guide platform is fixedly installed on the top of the stamping table and between the lower die and the collecting box.

[0011] Preferably, a set of handles is fixedly installed on the front and rear outer surfaces of the collection box, and a through groove communicating with the placement slot is opened on the rear side of the stamping table, through which the handles on the rear side of the collection box pass.

[0012] Preferably, a set of upright plates is fixedly installed on both outer surfaces of the stamping table and close to the front side of the stamping table. One set of upright plates is fixedly installed with a light curtain transmitter, and the other set of upright plates is fixedly installed with a light curtain receiver.

[0013] Preferably, four sets of anti-slip pads are fixedly installed on the top of the lower mold and are evenly distributed in a ring.

[0014] Preferably, a controller is fixedly installed on the front outer surface of the stamping table.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) The exhaust fan impeller stamping forming device uses the horizontal sliding cooperation between the top slider of the punch and the bottom groove of the upper mold in the detachable punch mechanism, and the first spring driven by the ring plate on the limit rod to automatically insert the positioning rod into the positioning hole of the slider to lock each punch independently. Each punch can independently bear the stamping load without loosening or shifting. After a single punch is worn, it is only necessary to lift the handle to drive the ring plate to move up so that the positioning rod exits the positioning hole, and the slider of the punch can be slid out horizontally from the opening of the groove to be removed for individual replacement. After the new punch slides in, the handle is released and it automatically resets and locks. The entire replacement process can be done by hand without tools. The replacement of a single punch can be completed in just a few seconds without disassembling the entire upper mold for repair. The downtime is greatly shortened, effectively reducing the mold maintenance cost and the production loss caused by downtime. At the same time, the independent detachability of each punch also avoids the waste of resources caused by the scrapping of the entire mold due to the wear of a single punch.

[0016] (2) The exhaust fan impeller stamping and forming device uses a servo motor to drive the screw to rotate and drive the arc-shaped push plate to move horizontally along the top of the lower mold. The electric push rod drives the support plate to rise, so that the top material column can smoothly lift the formed part from the forming groove to complete the demolding. The formed part is pushed by the arc-shaped push plate to the guide table and automatically slides into the collection box along the inclined surface. The entire process of stamping, demolding, and material collection is fully automated. There is no need for manual removal of the part from the mold, which avoids blade deformation or scratches caused by bumps or uneven force when manually removing the part, and ensures the blade accuracy and surface quality of the formed impeller. The collection box is automatically attached to the front side of the collection box by the limiting plate of the limiting mechanism under the push of the second spring to limit and fix it. When taking out the box, you only need to press down the limiting plate to compress the second spring to release the limit and pull the collection box out of the placement groove. The operation is convenient and labor-saving.

[0017] (3) In this exhaust fan impeller stamping forming device, the light curtain emitting end and the light curtain receiving end on the vertical plate form an invisible safety light curtain barrier in front of the stamping area. When the light curtain is blocked by the operator's hand or other objects, the control system automatically cuts off the stamping power source and brakes in an emergency, effectively preventing the operator from accidentally entering the work area during the stamping process and causing personal injury, thus ensuring the safety of equipment operation. The anti-slip pad on the top of the lower mold increases the friction between the sheet and the mold contact surface. The sheet will not slide or misalign at the moment the punch impacts the sheet at high speed, ensuring that the relative position of the sheet and the forming groove is accurate and consistent during each stamping, thereby ensuring the positional accuracy and dimensional consistency of each blade stamping and reducing stamping scrap caused by sheet sliding. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a frontal perspective view of the present invention; Figure 2 This is a front perspective view of the base and its upper components of the present invention; Figure 3 This is a front perspective view of the upper mold and its upper components according to the present invention; Figure 4 This is a bottom perspective view of the upper mold and its upper components of the present invention; Figure 5 This is a schematic diagram of the punch and its components according to the present invention; Figure 6 This is a bottom perspective view of the annular plate and its components according to the present invention; Figure 7 This is a bottom perspective view of the base and its upper components of the present invention; Figure 8 This is a schematic diagram of the lifting plate and its components according to the present invention; Figure 9 This is a schematic diagram of the limiting mechanism of the present invention.

[0019] Reference numerals: 1. Stamping table; 2. Lower die; 3. Forming groove; 4. Detachable punch mechanism; 41. Slide groove; 42. Punch; 43. Slider; 44. Annular plate; 45. Positioning rod; 46. Positioning hole; 47. Limiting rod; 48. End piece; 49. First spring; 410. Handle; 5. Pushing mechanism; 51. Strip groove; 52. Lead screw; 53. Servo motor; 54. L-shaped plate; 55. Arc-shaped push plate; 6. 61. Demolding mechanism; 62. Groove; 63. Fixing plate; 64. Electric push rod; 65. Support plate; 7. Ejector column; 76. Limiting mechanism; 77. Housing; 78. Limiting plate; 79. Second spring; 80. L-shaped seat; 91. Hydraulic rod; 10. Upper mold; 11. Guide table; 12. Collection box; 13. Pull handle; 14. Vertical plate; 15. Light curtain transmitter; 16. Light curtain receiver; 17. Anti-slip pad; 18. Controller. Detailed Implementation

[0020] Please see Figure 1-9 This invention provides a technical solution: a stamping and forming device for an exhaust fan impeller, comprising a stamping table 1, a lower mold 2, an upper mold 10, a detachable punch mechanism 4, a pushing mechanism 5, a demolding mechanism 6, and a limiting mechanism 7. The stamping table 1 is a main body made of a rectangular thick steel plate, with the lower mold 2 fixedly installed at its top center. The top of the lower mold 2 has four sets of forming grooves 3 evenly distributed in a ring, corresponding to the four sets of blades of the exhaust fan impeller. The sheet metal is stamped into blade shapes at the forming grooves 3. The top of the lower mold 2 is fixedly installed with four sets of anti-slip pads 17 evenly distributed in a ring. The anti-slip pads 17 increase the friction between the sheet metal and the mold, preventing the sheet metal from sliding or misaligning during stamping and ensuring stamping accuracy. An L-shaped seat 8 is fixedly installed on the rear outer surface of the stamping table 1. The L-shaped seat 8 extends upward and then bends forward to extend directly above the lower die 2. A hydraulic rod 9 is fixedly installed on the top of the L-shaped seat 8. The free end of the hydraulic rod 9 passes through the L-shaped seat 8 and extends downward. An upper die 10 is fixedly installed at the free end. The hydraulic rod 9 drives the upper die 10 to move up and down vertically to complete the stamping and resetting. A controller 18 is fixedly installed on the front outer surface of the stamping table 1 to control the action sequence of each electric component.

[0021] A detachable punch mechanism 4 is mounted on the upper mold 10 to enable independent and quick assembly and disassembly of each punch 42. The detachable punch mechanism 4 includes a slide 41, a punch 42, a slider 43, an annular plate 44, a positioning rod 45, a positioning hole 46, a limiting rod 47, an end piece 48, a first spring 49, and a handle 410. The bottom of the upper mold 10 has four sets of slides 41 evenly distributed in a ring. The openings of the four sets of slides 41 are located on the outer surface of the upper mold 10. The cross-section of the slides 41 is T-shaped or dovetail-shaped, providing horizontal sliding guidance and vertical constraint for the slider 43. A set of punches 42 is fitted to the bottom of the upper mold 10 at each set of slide grooves 41. A set of sliders 43 is fixedly installed on the top of each set of punches 42. Each set of sliders 43 is horizontally slidably installed in the corresponding slide groove 41. The punches 42 can be horizontally pushed into the slide groove 41 from the outside of the upper mold 10 and installed in place by means of the sliders 43, or they can be horizontally slid out and removed for replacement. An annular plate 44 is fitted to the top of the upper mold 10. The annular plate 44 is a circular metal plate. Four sets of positioning rods 45 are fixedly installed at the bottom of the annular plate 44 and are evenly distributed in a ring. A set of positioning holes 46 is opened on the top of each of the four sets of sliders 43. The four sets of positioning rods 45 extend downward through the upper mold 10 into the corresponding slide groove 41 and are inserted into the corresponding positioning holes 46, locking and fixing each slider 43 and punch 42 circumferentially. Four sets of limiting rods 47 are fixedly installed on the top of the upper mold 10 and are evenly distributed in a ring. An annular plate 44 is movably sleeved on each set of limiting rods 47, and the limiting rods 47 provide guidance for the up and down sliding of the annular plate 44. A set of end pieces 48 are fixedly installed on the top of each set of limiting rods 47 to prevent the annular plate 44 from falling off the limiting rods 47. A set of first springs 49 are sleeved on each set of limiting rods 47. One end of the first spring 49 is fixedly connected to the top of the annular plate 44, and the other end is fixedly connected to the corresponding end piece 48. The first spring 49 always applies a downward pushing force to the annular plate 44, keeping the annular plate 44 in contact with the top of the upper mold 10, thereby ensuring that the positioning rod 45 is always inserted into the positioning hole 46 without loosening. A handle 410 is fixedly installed on the top of the annular plate 44 for easy lifting during operation.

[0022] The pusher mechanism 5 is mounted on the stamping table 1 and is used to push the stamped and demolded parts from the top of the lower mold 2 into the collecting box 12. The pusher mechanism 5 includes a strip groove 51, a lead screw 52, ​​a servo motor 53, an L-shaped plate 54, and an arc-shaped push plate 55. The strip groove 51 is provided on the top of the stamping table 1 and on one side of the lower mold 2. The strip groove 51 extends horizontally, and the lead screw 52 is rotatably mounted between the inner walls of the two sides of the strip groove 51. The servo motor 53 is fixedly mounted on the outer surface of one side of the stamping table 1, and the shaft of the servo motor 53 is connected to the lead screw 52 through a coupling. An L-shaped plate 54 is threaded onto the lead screw 52. The bottom end of the L-shaped plate 54 is slidably installed in the strip groove 51, which guides and limits the sliding of the L-shaped plate 54. An arc-shaped push plate 55 is fixedly installed on the other end of the L-shaped plate 54 directly above the stamping table 1. The arc-shaped push plate 55 is located on one side of the lower mold 2, and its bottom is flush with the top of the lower mold 2. When the servo motor 53 drives the lead screw 52 to rotate, the L-shaped plate 54 moves along the strip groove 51, causing the arc-shaped push plate 55 to move horizontally. The arc-shaped push plate 55 pushes the molded part after demolding from the top of the lower mold 2 away from the lower mold 2. A guide plate 11 is fixedly installed on the top of the stamping table 1, between the lower mold 2 and the collection box 12. The upper surface of the guide plate 11 is an inclined surface. The molded part is pushed by the arc-shaped push plate 55 to the guide plate 11 and automatically slides into the collection box 12 along the inclined surface.

[0023] The demolding mechanism 6 is located at the bottom of the stamping table 1 and is used to eject the stamped part embedded in the forming groove 3 upwards. The demolding mechanism 6 includes a groove 61, a fixing plate 62, an electric push rod 63, a support plate 64, and an ejector post 65. The bottom of the stamping table 1 has a groove 61, and the fixing plate 62 is fixedly installed on the inner wall of the groove 61. The electric push rod 63 is fixedly installed at the bottom of the fixing plate 62, and the free end of the electric push rod 63 passes through the fixing plate 62 upwards and is fixedly installed on the support plate 64. Four sets of ejector pins 65 are fixedly installed on the top of the support plate 64 and are evenly distributed in a ring. The positions of the four sets of ejector pins 65 correspond one-to-one with the positions of the four sets of forming grooves 3. Each set of ejector pins 65 extends upward through the stamping table 1 into the corresponding forming groove 3. The top of each set of ejector pins 65 is flush with the bottom of the inner side of the corresponding forming groove 3. During normal stamping, the top surface of the ejector pins 65 is flush with the bottom surface of the forming groove 3 and does not affect the stamping. During demolding, the electric push rod 63 drives the support plate 64 to rise, which drives the four sets of ejector pins 65 to rise synchronously and push the formed part out of the forming groove 3.

[0024] A limiting mechanism 7 is located on the front side of the stamping table 1 to limit and fix the collection box 12, preventing it from shifting during the material collection process. The limiting mechanism 7 includes a housing 71, a limiting plate 72, and a second spring 73. A placement groove is provided on the top of the stamping table 1 and on the other side of the lower mold 2. The placement groove extends through the front side of the stamping table 1, and the collection box 12 is placed inside the placement groove. The collection box 12 is used to collect the finished impeller after stamping. A set of handles 13 are fixedly installed on the front and rear outer surfaces of the collection box 12. A through groove communicating with the placement groove is provided on the rear side of the stamping table 1. The handles 13 on the rear side of the collection box 12 pass through the through groove, allowing the operator to pull the collection box 12 from the rear side of the stamping table 1 using the handles 13. A housing 71 is fixedly installed on the front outer surface of the stamping table 1. A limiting plate 72 is slidably installed inside the housing 71. Two sets of second springs 73 are fixedly installed between the bottom of the limiting plate 72 and the inner bottom of the housing 71. The second springs 73 always apply an upward pushing force to the limiting plate 72, causing the limiting plate 72 to extend upward and fit against the front outer surface of the collection box 12 in a free state, thus limiting and fixing the collection box 12 in the placement slot. When it is necessary to remove the collection box 12, press the limiting plate 72 downward to compress the second springs 73 so that their tops are lowered below the bottom surface of the collection box 12, and the collection box 12 can be pulled forward from the placement slot.

[0025] Two sets of upright plates 14 are fixedly installed on the outer surfaces of both sides of the stamping table 1 and close to the front side of the stamping table 1. The two sets of upright plates 14 are respectively located on both sides of the stamping operation area. A light curtain transmitter 15 is fixedly installed on one set of upright plates 14, and a light curtain receiver 16 is fixedly installed on the other set of upright plates 14. The light curtain transmitter 15 and the light curtain receiver 16 form a safety light curtain in front of the stamping area. When the light curtain is blocked, the control system automatically cuts off the power source of the hydraulic rod 9 and applies an emergency brake to prevent the operator's hand from accidentally entering the stamping area and causing injury.

[0026] Working principle: The metal sheet is placed on top of the lower mold 2. The anti-slip pad 17 increases the friction between the sheet and the mold to prevent the sheet from sliding. The controller 18 starts the hydraulic rod 9 to drive the upper mold 10 to move downward. The four sets of punches 42 are pressed into the corresponding forming grooves 3 to stamp the sheet. After stamping, the hydraulic rod 9 drives the upper mold 10 to rise and reset. The electric push rod 63 drives the support plate 64 to rise, causing the four sets of ejector pins 65 to rise from the corresponding forming grooves 3 and eject the formed part from the mold. The servo motor 53 drives the lead screw 52 to rotate, which drives the L-shaped plate 54 and the arc-shaped push plate 55 to move along the strip groove 51. The arc-shaped push plate 55 pushes the demolded part from the top of the lower mold 2 through the guide table 11 into the collection box 12. The formed part slides along the inclined surface of the guide table 11 into the collection box 12 to complete the collection. When replacing the worn punch 42, pull the handle 410 upward to drive the annular plate 44 to compress the first spring 49 and move it upward along the limiting rod 47. The annular plate 44 drives the positioning rod 45 to exit the positioning hole 46 on the slider 43, and the slider 43 of the punch slides horizontally out of the slide groove 41 and is removed. After the slider 43 of the new punch slides into the slide groove 41, release the handle 410. The first spring 49 pushes the annular plate 44 to reset, so that the positioning rod 45 automatically inserts into the positioning hole 46 of the slider 43 on the new punch to complete the locking. After the collection box 12 is full, press the limiting plate 72 downward to compress the second spring 73 so that it is disengaged from the front side of the collection box 12. Pull the collection box 12 out of the placement groove and tilt it by pulling the handle 13. When the safety light curtain between the light curtain transmitter end 15 and the light curtain receiver end 16 is blocked during the punching process, the punching action will automatically stop.

[0027] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A stamping and forming device for an exhaust fan impeller, characterized in that, include: A stamping table (1) is fixedly installed on its top and at its center. The top of the lower mold (2) has four sets of forming grooves (3) evenly distributed in a ring. An L-shaped seat (8) extending upward and forward is fixedly installed on the rear outer surface of the stamping table (1). A hydraulic rod (9) is fixedly installed on the top of the L-shaped seat (8). The free end of the hydraulic rod (9) passes through the L-shaped seat (8) and is fixedly installed with an upper mold (10). The material pusher (5) is set on the stamping table (1) and is used to collect the molded parts; The demolding mechanism (6) is located at the bottom of the stamping table (1) and is used to demold the molded part. The limiting mechanism (7) is located on the front side of the stamping table (1) and is used for limiting. A detachable punch mechanism (4) is provided on the upper mold (10). The detachable punch mechanism (4) includes a slide (41), a punch (42) and a slider (43). The bottom of the upper mold (10) is provided with four sets of slides (41) and they are evenly distributed in a ring. The openings of the four sets of slides (41) are located on the outer surface of the upper mold (10). A set of punches (42) is attached to the bottom of the upper mold (10) and located at each slide (41). A set of sliders (43) is fixedly installed on the top of each set of punches (42). Each set of sliders (43) is horizontally slidably installed in the corresponding slide (41).

2. The exhaust fan impeller stamping and forming device according to claim 1, characterized in that: The detachable punch mechanism (4) also includes an annular plate (44), positioning rods (45), positioning holes (46), limiting rods (47), end plates (48), a first spring (49), and a handle (410). The top of the upper mold (10) is fitted with an annular plate (44). The bottom of the annular plate (44) is fixedly installed with four sets of positioning rods (45) evenly distributed in a ring. The top of each of the four sets of sliders (43) is provided with a set of positioning holes (46). The four sets of positioning rods (45) extend through the upper mold (10) to the corresponding slide groove (41) and are inserted into the corresponding positioning holes (410). 6) Inside, four sets of limiting rods (47) are fixedly installed on the top of the upper mold (10) and are evenly distributed in a ring. The ring plate (44) is movably sleeved on each set of limiting rods (47). One end of each set of limiting rods (47) is fixedly installed with a set of end pieces (48). Each set of limiting rods (47) is sleeved with a set of first springs (49). One end of each set of first springs (49) is fixedly connected to the top of the ring plate (44). The other end of each set of first springs (49) is fixedly connected to the corresponding end piece (48). A handle (410) is fixedly installed on the top of the ring plate (44).

3. The exhaust fan impeller stamping and forming device according to claim 2, characterized in that: The pushing mechanism (5) includes a strip groove (51), a lead screw (52), a servo motor (53), an L-shaped plate (54), and an arc-shaped push plate (55). The top of the stamping table (1) and one side of the lower mold (2) is provided with a strip groove (51). A lead screw (52) is rotatably installed between the inner walls of the two sides of the strip groove (51). A servo motor (53) is fixedly installed on the outer surface of one side of the stamping table (1). The shaft of the servo motor (53) is connected to the lead screw (52) for transmission. An L-shaped plate (54) is threaded on the lead screw (52). One end of the L-shaped plate (54) is slidably installed in the strip groove (51). The other end of the L-shaped plate (54) is fixedly installed above the stamping table (1) with an arc-shaped push plate (55). The arc-shaped push plate (55) is located on one side of the lower mold (2), and the bottom of the arc-shaped push plate (55) is flush with the top of the lower mold (2).

4. The exhaust fan impeller stamping and forming device according to claim 3, characterized in that: The demolding mechanism (6) includes a groove (61), a fixed plate (62), an electric push rod (63), a support plate (64), and ejector pins (65). The bottom of the stamping table (1) is provided with a groove (61). A fixed plate (62) is fixedly installed on the inner wall of the groove (61). An electric push rod (63) is fixedly installed at the bottom of the fixed plate (62). The free end of the electric push rod (63) passes through the fixed plate (62) and is fixedly installed on the support plate (64). Four sets of ejector pins (65) are fixedly installed on the top of the support plate (64) and are evenly distributed in a ring. Each set of ejector pins (65) passes through the stamping table (1) and extends into the corresponding forming groove (3). The top of each set of ejector pins (65) is flush with the inner bottom of the corresponding forming groove (3).

5. The exhaust fan impeller stamping and forming device according to claim 4, characterized in that: The limiting mechanism (7) includes a housing (71), a limiting plate (72), and a second spring (73). A placement groove is provided on the top of the stamping table (1) and on the other side of the lower mold (2). The placement groove is opened to the front side of the stamping table (1). A collection box (12) is placed in the placement groove. The housing (71) is fixedly installed on the outer surface of the front side of the stamping table (1). The limiting plate (72) is slidably installed inside the housing (71). Two sets of second springs (73) are fixedly installed between the bottom of the limiting plate (72) and the bottom of the inner side of the housing (71). The limiting plate (72) is in contact with the outer surface of the front side of the collection box (12).

6. The exhaust fan impeller stamping and forming device according to claim 5, characterized in that: A guide platform (11) is fixedly installed on top of the stamping table (1) and between the lower mold (2) and the collection box (12).

7. The exhaust fan impeller stamping and forming device according to claim 6, characterized in that: A set of handles (13) are fixedly installed on the front and rear outer surfaces of the collection box (12). A through groove communicating with the placement slot is opened on the rear side of the stamping table (1). The handles (13) on the rear side of the collection box (12) pass through the through groove.

8. The exhaust fan impeller stamping and forming device according to claim 7, characterized in that: On both outer surfaces of the stamping table (1) and close to the front side of the stamping table (1), a set of upright plates (14) are fixedly installed. One set of upright plates (14) is fixedly installed with a light curtain transmitter (15), and the other set of upright plates (14) is fixedly installed with a light curtain receiver (16).

9. The exhaust fan impeller stamping and forming device according to claim 8, characterized in that: The top of the lower mold (2) is fixedly equipped with four sets of anti-slip pads (17) and they are evenly distributed in a ring.

10. The exhaust fan impeller stamping and forming device according to claim 9, characterized in that: A controller (18) is fixedly installed on the front outer surface of the stamping table (1).

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