A positioning device for a ring-shaped multi-hole punching die

Abstract

This invention relates to the field of molds, and more particularly to a positioning device for a ring-shaped multi-hole punching die. The technical problem is that the workpiece is prone to displacement, and multiple adjustments to the punching position are required before punching. Furthermore, thin-walled workpieces move with the hydraulic rod, causing them to bounce. The technical solution is a positioning device for a ring-shaped multi-hole punching die, including a mounting frame and a support unit; the mounting frame is connected to the support unit. This invention positions the workpiece by a positioning plate against a notch in the side wall of the workpiece cover. The positioning plate extends into the notch of the workpiece cover, preventing the workpiece cover from rotating or moving, thus positioning the workpiece cover. The positioning plate then actively disengages from the workpiece cover, avoiding lateral pressure to the left, which could cause the punching position to have excessive flatness. Additionally, when the punch completely exits the circular hole of the workpiece cover, two L-shaped plates fix the workpiece cover, preventing it from bouncing and damaging the flatness of the workpiece's flange.

Description

Technical Field

[0001] This invention relates to the field of molds, and more particularly to a positioning device for a ring-shaped multi-hole punching die. Background Technology

[0002] Blanking is a stamping process that uses a die to separate part of the material or workpiece from another part of the material, workpiece, or scrap. Blanking is a general term for separation processes such as shearing, blanking, punching, notching, grooving, slitting, chiseling, trimming, tongue cutting, cutting, and finishing.

[0003] When existing blanking dies are used to blank workpieces, the workpiece is prone to displacement, resulting in blanking deviations and affecting the precision of workpiece processing. Furthermore, depending on the workpiece structure, the blanking position needs to be corrected multiple times before punching. When punching thin-walled workpieces, the thin-walled workpiece will move with the hydraulic rod after blanking, causing the workpiece to jump and fall onto the support platform to collide with the scrap material. The workpiece is easily scratched or even deformed. Summary of the Invention

[0004] To overcome the disadvantages of workpieces being prone to displacement, requiring multiple corrections of the punching position before punching, and thin-walled workpieces moving with the hydraulic rod, causing workpiece jumping, this invention provides a positioning device for a ring-shaped multi-hole punching die.

[0005] Technical Solution: A positioning device for a ring-shaped multi-hole punching die includes a mounting frame and a three-lobed transfer platform. The three-lobed transfer platform is positioned above the mounting frame. Several punching holes of different sizes are formed on the three-lobed transfer platform, and some punching holes have two recessed grooves. Three placement slots are arranged in a ring array on the three-lobed transfer platform, and several punching holes are evenly distributed around the three placement slots. The device also includes a transfer unit, an anti-bounce unit, a support unit, a rotating unit, a positioning unit, a correction unit, and a punching unit. The left side of the mounting frame is connected to the transfer unit. The upper part of the transfer unit is connected to the three-lobed transfer platform. The three-lobed transfer platform is connected to the anti-bounce unit. The mounting frame is connected to the support unit, which is located below the three-lobed transfer platform. The mounting frame is connected to the rotating unit, which is located to the right of the three-lobed transfer platform. The left side of the rotating unit is connected to the support unit. The rotating unit is connected to the positioning unit. The positioning unit is connected to the correction unit. The rotating unit is connected to the punching unit, which is located above the positioning unit and above the three-lobed transfer platform.

[0006] As a preferred embodiment of the present invention, the transfer unit includes a fixed base, a first power component, a rotating shaft frame, and a first transmission rod; the fixed base is fixedly connected to the left side of the mounting frame; the first power component is installed at the lower part of the fixed base; the rotating shaft frame is fixedly connected to the upper surface of the fixed base; the first transmission rod is rotatably connected to the upper part of the rotating shaft frame; the lower part of the first transmission rod is fixedly connected to the output shaft of the first power component; and the upper part of the first transmission rod is fixedly connected to the three-lobe transfer table.

[0007] As a preferred embodiment of the present invention, the anti-bounce unit includes a rotating rod, an L-shaped plate, and a torsion plate; a rotating rod is rotatably connected in each recessed groove; an L-shaped plate is fixedly connected to each rotating rod, and the upper part of each L-shaped plate is higher than the upper surface of the three-leaf transfer table; a torsion spring is provided between each L-shaped plate and the three-leaf transfer table.

[0008] As a preferred embodiment of the present invention, the supporting unit includes an electric lifting platform, a first support plate, a first electric actuator, a bearing plate, a second transmission rod, a turntable, and a piston rod. The electric lifting platform is mounted on a mounting frame. Two first support plates are fixedly connected to the upper part of the electric lifting platform. A first electric actuator is mounted on the upper surface of each of the two first support plates. The telescopic parts of the two first electric actuators are jointly fixed to a bearing plate, the bearing plate having a hollowed-out center. The top surface of the bearing plate contacts a three-lobe transfer platform. Several vertical slots are formed on the bearing plate, with the bottom of the slots sealed. Several piston rods are slidably connected to the bearing plate. Each piston rod is located within a vertical slot, with its lower part extending out of the slot. Each vertical slot corresponds to a punching hole. A second transmission rod is rotatably connected to the electric lifting platform. A turntable is fixedly connected to the upper part of the second transmission rod, and an annular protrusion is provided on the upper edge of the turntable. The turntable is connected to a rotating unit. The piston rod is connected to the rotating unit.

[0009] As a preferred embodiment of the present invention, the rotating unit includes a support beam, a second power assembly, a second support plate, a third transmission rod, a gear, and a gear ring; the support beam is fixedly connected to the mounting frame; the support beam is connected to the positioning unit; the upper part of the support beam is connected to the punching unit; the support beam is located to the right of the electric lifting platform; the second power assembly is installed on the left side of the support beam; two second support plates are fixedly connected to the left side of the support beam; a third transmission rod is rotatably connected to the two second support plates; the lower part of the third transmission rod is fixedly connected to the output shaft of the second power assembly; a gear is fixedly connected to the upper part of the third transmission rod; a gear ring is fixedly connected to the outer ring surface of the turntable; the right side of the gear ring meshes with the gear; the gear ring is used to contact and engage with the piston rod.

[0010] As a preferred embodiment of the present invention, the positioning unit includes a second electric actuator, a connecting plate, a slide rod, and a positioning plate; the second electric actuator is installed on the right side of the support beam; the connecting plate is fixedly connected to the telescopic part of the second electric actuator; the slide rod is fixedly connected to the upper part of the connecting plate; the slide rod is connected to the correction unit; the outer surface of the slide rod is slidably connected to the support beam; the positioning plate is slidably connected to the left side of the slide rod, and the positioning plate is a teardrop-shaped protrusion; the positioning plate is slidably connected to the support beam; a T-shaped groove is opened on the left side of the positioning plate; a hollowed-out groove is opened on the right side of the positioning plate; and an opening groove is opened at the front and rear of the positioning plate.

[0011] As a preferred embodiment of the present invention, the correction unit includes a wing plate, a contact rod, an annular ring, and an elastic element; a wing plate is rotatably connected to the front and rear of the positioning plate; each of the two wing plates is located in an open slot; a torsion spring is provided between each of the two wing plates and the positioning plate; a contact rod is slidably connected to the front and rear of the positioning plate; each of the two contact rods contacts a wing plate on its opposite side; an annular ring is fixedly connected to the opposite side of the two contact rods, and the annular ring is a deformable elliptical spring; the annular ring is located in a T-shaped groove; the right side of the annular ring contacts a sliding rod; an elastic element is fixedly connected to the left side of the sliding rod; the left side of the elastic element is fixedly connected to the positioning plate; the elastic element is located in a hollowed-out groove.

[0012] As a preferred embodiment of the present invention, the punching unit includes a third support plate, a hydraulic press, an annular plate, a tool holder, and punches; the third support plate is fixedly connected to the upper part of the support beam; two hydraulic presses are mounted on the third support plate; the annular plate is fixedly connected to the lower part of the two hydraulic presses; three tool holders are mounted on the lower part of the annular plate; each of the three tool holders is equipped with a plurality of punches; each punch corresponds to a punching hole; each punch corresponds to a vertical slot.

[0013] As a preferred embodiment of the present invention, the three-leaf transfer platform is shaped like a clover.

[0014] As a preferred embodiment of the present invention, the upper part of the L-shaped plate is an arc-shaped surface, and an anti-slip rubber material is provided on the arc-shaped surface.

[0015] Compared with the prior art, the present invention has the following advantages: The turntable of the present invention drives the workpiece cover to rotate, and the side wall of the workpiece cover slides in contact with the arc surface of the left side of the positioning plate until the positioning plate is aligned with the notch of the side wall of the workpiece cover. The positioning plate extends into the notch of the workpiece cover, and the workpiece cover cannot rotate or move, thus completing the positioning of the workpiece cover. After the positioning plate completes the positioning, it actively disengages from the workpiece cover, avoiding the positioning plate from pushing the workpiece cover to the left, which would cause the workpiece cover to be subjected to lateral compression to the left during the circular hole punching process, resulting in stress concentration on the workpiece cover and the problem of the flatness of the punching position of the flange connection of the workpiece cover being out of tolerance.

[0016] When the punch of this invention retracts to the position of the workpiece cover, the upper part of the two L-shaped plates, under the recovery of the torsion spring, contacts the inner wall of the circular hole of the workpiece cover. This means that when the punch is completely withdrawn from the circular hole of the workpiece cover, the two L-shaped plates fix the workpiece cover, preventing the workpiece cover from being carried upward by the punch and then falling under its own weight. This would cause the workpiece cover to bounce and fall, making the thin-walled workpiece cover prone to deformation and damaging the flatness of the flange of the workpiece. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the positioning device for a ring-shaped multi-hole punching die according to the present invention.

[0018] Figure 2 This is a schematic diagram of a second three-dimensional structure of the positioning device for a ring-shaped multi-hole punching die according to the present invention;

[0019] Figure 3 This is a front view of the positioning device for a ring-shaped multi-hole punching die according to the present invention;

[0020] Figure 4 This is a three-dimensional structural diagram of the transfer unit of the positioning device for a ring-shaped multi-hole punching die of the present invention;

[0021] Figure 5 This is an enlarged three-dimensional structural diagram of the positioning device A for a ring-shaped multi-hole punching die of the present invention;

[0022] Figure 6 This is a schematic diagram of a first combined three-dimensional structure of the positioning device for a ring-shaped multi-hole punching die according to the present invention;

[0023] Figure 7 This is a partial three-dimensional structural diagram of the support unit of the positioning device for a ring-shaped multi-hole punching die of the present invention;

[0024] Figure 8 This is an enlarged three-dimensional structural schematic diagram of the positioning device B for the annular multi-hole punching die of the present invention;

[0025] Figure 9 This is a three-dimensional structural diagram of the positioning unit of the positioning device for the positioning device of the annular multi-hole punching die of the present invention;

[0026] Figure 10 This is a three-dimensional structural diagram of the correction unit of the positioning device for a ring-shaped multi-hole punching die of the present invention;

[0027] Figure 11 This is a schematic diagram of a second combined three-dimensional structure of the positioning device for a ring-shaped multi-hole punching die according to the present invention;

[0028] Figure 12This is a schematic diagram of a third combination of the positioning device for a ring-shaped multi-hole punching die according to the present invention.

[0029] Component names and serial numbers in the diagram: 1-Mounting bracket, 2-Three-lobe transfer table, 2001-Punching hole, 2002-Inner groove, 2003-Placement groove, 101-Fixed seat, 102-First power assembly, 103-Spindle bracket, 104-First transmission rod, 201-Rotor, 202-L-shaped plate, 203-Torsion plate, 301-Electric lifting platform, 302-First support plate, 303-First electric actuator, 304-Bearing plate, 305-Second transmission rod, 306-Turntable, 307-Piston rod, 30401-Vertical groove, 4 01-Support beam, 402-Second power assembly, 403-Second support plate, 404-Third transmission rod, 405-Gear, 406-Gear ring, 501-Second electric actuator, 502-Connecting plate, 503-Slide rod, 504-Positioning plate, 50401-T-slot, 50402-Cutout slot, 50403-Opening slot, 601-Wing plate, 602-Contact rod, 603-Annular ring, 604-Elastic element, 701-Third support plate, 702-Hydraulic press, 703-Annular plate, 704-Tool holder, 705-Punch. Detailed Implementation

[0030] The following description is only a preferred embodiment of the present invention and does not limit the scope of protection of the present invention.

[0031] Example 1

[0032] A positioning device for a ring-shaped multi-hole punching die, according to Figure 1-12 As shown, it includes a mounting frame 1 and a three-lobe transfer table 2; the three-lobe transfer table 2 is arranged above the mounting frame 1; the three-lobe transfer table 2 has several punching holes 2001 of different sizes, and some of the punching holes 2001 have two recessed grooves 2002 inside; the three-lobe transfer table 2 has three placement slots 2003 arranged in a ring array, and the several punching holes 2001 are evenly distributed around the three placement slots 2003.

[0033] It also includes a transfer unit, an anti-bounce unit, a support unit, a rotating unit, a positioning unit, a correction unit, and a punching unit; the left side of the mounting frame 1 is connected to the transfer unit; the upper part of the transfer unit is connected to the three-leaf transfer platform 2; the three-leaf transfer platform 2 is connected to the anti-bounce unit; the mounting frame 1 is connected to the support unit; the support unit is located below the three-leaf transfer platform 2; the mounting frame 1 is connected to the rotating unit; the rotating unit is located to the right of the three-leaf transfer platform 2; the left side of the rotating unit is connected to the support unit; the rotating unit is connected to the positioning unit; the positioning unit is connected to the correction unit; the rotating unit is connected to the punching unit; the punching unit is located above the positioning unit; the punching unit is located above the three-leaf transfer platform 2. The workpiece cover is transferred to the placement slot 2003 of the three-leaf transfer table 2. The transfer unit transfers the workpiece cover to the bottom of the punching unit. The supporting unit supports the bottom of the workpiece cover, while the positioning unit abuts against the side wall of the workpiece cover. The rotating unit rotates the workpiece cover until the positioning unit is positioned at the slot of the workpiece cover. Then the correction unit contacts the workpiece cover, causing the positioning unit to disengage from the workpiece cover. The positioning unit no longer abuts against the side of the workpiece cover. The punching unit punches holes in the flange connection of the workpiece cover. When the punching is completed, the anti-bounce unit leaves the waste material in the supporting unit and abuts against the inner wall of the punched hole of the workpiece cover. The workpiece cover does not bounce with the movement of the punching unit and avoids the workpiece cover from contacting the waste material again.

[0034] The three-leaf transfer table 2 is shaped like a clover and is used to separate the loading, punching and unloading processes to avoid material jamming and to allow the loading and unloading to be carried out in a cyclical manner, which helps to save space.

[0035] according to Figure 1 and Figure 4 As shown, the transfer unit includes a fixed base 101, a first power assembly 102, a rotating shaft frame 103, and a first transmission rod 104; the fixed base 101 is bolted to the left side of the mounting frame 1; the first power assembly 102 is installed at the lower part of the fixed base 101; the rotating shaft frame 103 is welded to the upper surface of the fixed base 101; the first transmission rod 104 is rotatably connected to the upper part of the rotating shaft frame 103; the lower part of the first transmission rod 104 is fixedly connected to the output shaft of the first power assembly 102; the upper part of the first transmission rod 104 is fixedly connected to the three-lobe transfer table 2.

[0036] The first power component 102 is a servo motor.

[0037] according to Figure 1 and Figure 5 As shown, the anti-bounce unit includes a rotating rod 201, an L-shaped plate 202, and a torsion plate 203; each recessed groove 2002 is rotatably connected to a rotating rod 201; each rotating rod 201 is fixedly connected to an L-shaped plate 202, and the upper part of each L-shaped plate 202 is higher than the upper surface of the trilobal transfer table 2; each L-shaped plate 202 is connected to the trilobal transfer table 2 by a torsion spring.

[0038] The upper part of the L-shaped plate 202 is an arc-shaped surface, and anti-slip rubber material is provided on its arc-shaped surface.

[0039] according to Figure 1 and Figure 6-8 As shown, the supporting unit includes an electric lifting platform 301, a first support plate 302, a first electric actuator 303, a bearing plate 304, a second transmission rod 305, a turntable 306, and a piston rod 307; the electric lifting platform 301 is mounted on the mounting frame 1; two first support plates 302 are welded to the upper part of the electric lifting platform 301; a first electric actuator 303 is mounted on the upper surface of each of the two first support plates 302; the telescopic parts of the two first electric actuators 303 are jointly fixed to a bearing plate 304, the bearing plate 304 is hollowed out in the middle; the top surface of the bearing plate 304 contacts the three-lobe transfer table 2; the bearing plate 304... The support plate 304 has several vertical slots 30401, and the bottom of the vertical slots 30401 is sealed; several piston rods 307 are slidably connected to the support plate 304; each piston rod 307 is located in a vertical slot 30401, and the lower part of the piston rod 307 extends out from the vertical slot 30401; each vertical slot 30401 corresponds to a punching hole 2001; a second transmission rod 305 is rotatably connected to the electric lifting platform 301; a turntable 306 is fixedly connected to the upper part of the second transmission rod 305, and an annular protrusion is provided on the upper edge of the turntable 306; the turntable 306 is connected to the rotating unit; the piston rods 307 are connected to the rotating unit.

[0040] The first electric actuator 303 is an electric push rod.

[0041] according to Figure 1 and Figure 6 As shown, the rotating unit includes a support beam 401, a second power assembly 402, a second support plate 403, a third transmission rod 404, a gear 405, and a gear ring 406. The support beam 401 is welded onto the mounting frame 1. The support beam 401 is connected to the positioning unit. The upper part of the support beam 401 is connected to the punching unit. The support beam 401 is located to the right of the electric lifting platform 301. The second power assembly 402 is installed on the left side of the support beam 401. Two second support plates 403 are bolted to the left side of the support beam 401. A third transmission rod 404 is rotatably connected to both second support plates 403. The lower part of the third transmission rod 404 is fixedly connected to the output shaft of the second power assembly 402. The gear 405 is fixedly connected to the upper part of the third transmission rod 404. A gear ring 406 is fixedly connected to the outer ring surface of the turntable 306. The right side of the gear ring 406 meshes with the gear 405. The gear ring 406 is used to contact and engage with the piston rod 307.

[0042] The second power component 402 is a servo motor.

[0043] according to Figure 1 and Figure 9As shown, the positioning unit includes a second electric actuator 501, a connecting plate 502, a slide rod 503, and a positioning plate 504; the second electric actuator 501 is installed on the right side of the support beam 401; the connecting plate 502 is fixedly connected to the telescopic part of the second electric actuator 501; the slide rod 503 is welded to the upper part of the connecting plate 502; the slide rod 503 is connected to the correction unit; the outer surface of the slide rod 503 is slidably connected to the support beam 401; the positioning plate 504 is slidably connected to the left side of the slide rod 503, and the positioning plate 504 is a teardrop-shaped protrusion; the positioning plate 504 is slidably connected to the support beam 401; a T-shaped groove 50401 is opened on the left side of the positioning plate 504; a hollowed-out groove 50402 is opened on the right side of the positioning plate 504; and an opening groove 50403 is opened at the front and rear of the positioning plate 504.

[0044] The second electric actuator 501 is an electric push rod.

[0045] The left side of the positioning plate 504 is a smooth plane, which is used to reduce sliding friction when in contact with the workpiece cover.

[0046] according to Figure 1 and Figure 10-11 As shown, the correction unit includes a wing plate 601, a contact rod 602, an annular ring 603, and an elastic element 604. A wing plate 601 is rotatably connected to the front and rear of the positioning plate 504. Each of the two wing plates 601 is located within an opening slot 50403. A torsion spring is provided between each of the two wing plates 601 and the positioning plate 504. A contact rod 602 is slidably connected to the front and rear of the positioning plate 504. Each of the two contact rods 602 contacts a wing plate 601 on its opposite side. An annular ring 603, a deformable elliptical spring, is fixedly connected to the opposite side of the two contact rods 602. The annular ring 603 is located within a T-shaped groove 50401. The right side of the annular ring 603 contacts a sliding rod 503. An elastic element 604 is fixedly connected to the left side of the sliding rod 503. The left side of the elastic element 604 is fixedly connected to the positioning plate 504. The elastic element 604 is located within a hollowed-out groove 50402.

[0047] according to Figure 1 and Figure 12 As shown, the punching unit includes a third support plate 701, a hydraulic press 702, an annular plate 703, a tool holder 704, and a punch 705; the third support plate 701 is welded to the upper part of the support beam 401; two hydraulic presses 702 are mounted on the third support plate 701; the annular plate 703 is fixedly connected to the lower part of the two hydraulic presses 702; three tool holders 704 are mounted on the lower part of the annular plate 703; several punches 705 are mounted on each of the three tool holders 704; each punch 705 corresponds to a punching hole 2001; each punch 705 corresponds to a vertical groove 30401.

[0048] Before using the positioning device of the blanking die, the workpiece to be processed is first defined as follows: the workpiece to be processed is a thin-walled workpiece cover, and the workpiece cover is provided with a flange connection. The cavity depth difference of the workpiece cover is 45mm, and there are several notches on the side wall and flange connection of the workpiece cover. At this time, the flange part of the workpiece cover needs to be blanked with circular holes. The three-leaf transfer table 2 is clover-shaped. Through the three leaf-shaped protrusions on the three-leaf transfer table 2, the processing area is divided into three positions: loading, punching and unloading, so that the blanking of the circular holes of the workpiece cover is carried out continuously, improving work efficiency.

[0049] The operator installs the positioning device of the punching die in a horizontal position within the workpiece cover processing workshop, connects the power supply to the workshop, and then controls the automatic feeder to transfer a workpiece cover and place it in the placement slot 2003, so that the flange of the workpiece cover contacts the three-lobed transfer table 2. Next, the operator controls the activation of the first power assembly 102, whose output shaft rotates, synchronously driving the three-lobed transfer table 2 to rotate, moving the workpiece cover directly below the punching unit. Then, the workpiece cover needs to be positioned to determine the punching position of the circular hole on the flange of the workpiece cover. At this time, the operator controls the activation of the electric lifting platform 301, which moves upwards... The turntable 306 is raised, and the turntable 306 moves upward until the upper surface of the turntable 306 contacts the lower part of the workpiece cover. At this time, the inner surface of the annular protrusion on the turntable 306 holds the workpiece cover. Then, the electric lifting platform 301 is raised, and the turntable 306 moves the workpiece cover upward, so that the workpiece cover is replaced by the turntable 306 instead of being supported by the three-lobe transfer platform 2. To determine the punching position of the circular hole of the workpiece cover, the workpiece cover needs to be rotated. By lifting the workpiece cover upward, the flange of the workpiece cover is disengaged from the three-lobe transfer platform 2, thereby reducing the contact friction between the workpiece cover and the three-lobe transfer platform 2 during the rotation process, which reduces the rotation efficiency of the workpiece cover.

[0050] Next, the second electric actuator 501 is activated. The second electric actuator 501 retracts, simultaneously driving the positioning plate 504 closer to the workpiece cover. If the positioning plate 504 contacts the side wall of the workpiece cover, the second electric actuator 501 is deactivated. At this time, the second power assembly 402 is activated. The output shaft of the second power assembly 402 rotates, simultaneously driving the turntable 306 to rotate. The turntable 306 then drives the workpiece cover to rotate. The side wall of the workpiece cover slides against the arc surface on the left side of the positioning plate 504 until the positioning plate 504 is aligned with the notch on the side wall of the workpiece cover. At this point, the second power assembly 402 is deactivated, and the workpiece cover stops rotating. Then, the electric lifting platform 301 is moved downwards, causing the flange of the workpiece cover to reconnect with the three-lobed transfer platform 2. Upon contact, the second electric actuator 501 is activated. The second electric actuator 501 continues to retract, synchronously driving the positioning plate 504 to extend into the notch of the workpiece cover. As the positioning plate 504 continues to extend, the wing plates 601 on the front and rear of the positioning plate 504 contact the edge of the notch in the workpiece cover. Initially, under the action of the torsion springs, the right side of each wing plate 601 protrudes from an opening slot 50403, and the elastic element 604 is in a compressed state. As the positioning plate 504 continues to move, the two wing plates 601 are pressed into the positioning plate 504 by the notch in the workpiece cover, causing the torsion springs on the two wing plates 601 to deform. Each of the two wing plates 601 drives a contact rod 602 to move closer to each other. Then the two... The contact rod 602 presses and deforms the annular ring 603 towards the center, causing it to return to a circular shape. At this point, the diameter of the circular ring 603 is larger than the diameter of the sliding rod 503, causing the sliding rod 503 to disengage from the annular ring 603. The elastic element 604 then returns to its original position, simultaneously driving the positioning plate 504 to move to the right. This allows the positioning plate 504 to actively disengage from the workpiece cover after positioning, preventing it from pushing the workpiece cover to the left. This would prevent the workpiece cover from being subjected to lateral pressure to the left during the circular hole punching process, which could lead to stress concentration on the workpiece cover and cause the flatness of the punched hole at the flange connection of the workpiece cover to exceed the tolerance. When the positioning plate 504 is no longer in contact with the workpiece cover, the two wing plates 601 return to their original position under the action of the torsion spring. The annular ring 603 begins to recover, while the slide rod 503 remains inside the annular ring 603. The inner surface of the annular ring 603 is attached to the upper and lower parts of the slide rod 503. Then, the second electric actuator 501 is activated, extending and simultaneously driving the positioning plate 504 to move to the right until the positioning plate 504 contacts the support beam 401. The slide rod 503 continues to move to the right, at which point the positioning plate 504 is held against the support beam 401, causing the slide rod 503 to be pulled out of the annular ring 603. The annular ring 603 recovers, simultaneously driving the two contact rods 602 to move away from each other. The slide rod 503 then rests against the right side of the annular ring 603, ready for the next notch positioning of the workpiece cover. The second electric actuator 501 is then shut off.

[0051] After positioning is completed, the two first electric actuators 303 are activated, extending and synchronously driving the support plate 304 upward, so that the support plate 304 abuts against the lower surface of the tri-lobe transfer table 2, preventing the tri-lobe transfer table 2 from being squeezed and deformed during punching. The two first electric actuators 303 are then deactivated. Next, the two hydraulic presses 702 are activated, extending and synchronously driving the punches 705 downward, until several punches 705 simultaneously punch the flange portion of the workpiece cover. The punch 705 passes through the workpiece cover and the blanking hole 2001, and the blanked waste falls into the upper surface of the piston rod 307 in the vertical groove 30401. When the punch 705 moves downward, it first blanks the circular hole of the workpiece cover. To ensure that the waste does not stick to the circular hole of the workpiece cover, the punch 705 needs to continue to move downward. When the workpiece cover is placed on the three-leaf transfer table 2, the flange of the workpiece cover presses the two L-shaped plates 202 downward, so that the upper part of the two L-shaped plates 202 abuts against the lower part of the flange of the workpiece cover. On the surface, when the punch 705 punches a circular hole in the workpiece cover, the punch 705 moves downward and contacts two L-shaped plates 202. The two L-shaped plates 202 rotate, and at this time, the torsion spring between the L-shaped plates 202 and the three-lobe transfer table 2 deforms. As the punch 705 presses down, each L-shaped plate 202 rotates into an inner groove 2002, and the waste material at the bottom of the punch 705 falls into the vertical groove 30401. Then, the two hydraulic presses 702 are controlled to retract, synchronously driving several punches 70 5. Moving upwards, when the punch 705 retracts to the position of the workpiece cover, the upper parts of the two L-shaped plates 202, under the recovery of the torsion spring, contact the inner wall of the circular hole of the workpiece cover. This allows the two L-shaped plates 202 to fix the workpiece cover when the punch 705 completely retracts from the circular hole of the workpiece cover, preventing the workpiece cover from being carried upwards by the punch 705 and then falling under its own weight, causing the workpiece cover to bounce and fall, which would easily deform the thin-walled workpiece cover and damage the flatness of the flange of the workpiece.

[0052] After punching is completed, the two first electric actuators 303 are activated and retract, causing the support plate 304 to descend synchronously. This, in turn, drives the piston rod 307 to descend until it abuts against the upper surface of the gear ring 406. As the support plate 304 continues to descend, the piston rod 307 moves upward relative to the vertical groove 30401, pushing the waste material in the vertical groove 30401 onto the surface of the support plate 304. The waste material is then removed by the ventilation equipment in the workshop. Next, the electric lifting platform 301 is activated and descends until the height of the support plate 304 is lower than the bottom of the workpiece cover, completely separating the lower part of the workpiece cover from the turntable 306 and the support plate 304. The electric lifting platform 301 is then deactivated. The first power assembly 102 is then activated and rotates, synchronously driving the three-lobe transfer platform 2 to rotate. The three-lobe transfer platform 2 then transfers the punched workpiece cover to the discharge position. At this point, the operator controls the material handling mechanism to remove the workpiece cover.

[0053] Although this disclosure has been described with respect to only a limited number of embodiments, those skilled in the art who benefit from this disclosure will understand that various other embodiments can be devised without departing from the scope of the invention. Therefore, the scope of the invention should be limited only by the appended claims.

Claims

1. A positioning device for a ring-shaped multi-hole punching die, comprising a mounting frame (1) and a three-lobed transfer platform (2); the three-lobed transfer platform (2) is disposed above the mounting frame (1); the three-lobed transfer platform (2) has a plurality of punching holes (2001) of different sizes, and some of the punching holes (2001) have two recessed grooves (2002) inside; the three-lobed transfer platform (2) has three placement slots (2003) arranged in a ring array, and the plurality of punching holes (2001) are evenly distributed around the three placement slots (2003); characterized in that, It also includes a transfer unit, an anti-bounce unit, a support unit, a rotating unit, a positioning unit, a correction unit, and a punching unit; the left side of the mounting frame (1) is connected to the transfer unit; the upper part of the transfer unit is connected to the three-leaf transfer platform (2); the three-leaf transfer platform (2) is connected to the anti-bounce unit; the mounting frame (1) is connected to the support unit; the support unit is located below the three-leaf transfer platform (2); the mounting frame (1) is connected to the rotating unit; the rotating unit is located to the right of the three-leaf transfer platform (2); the left side of the rotating unit is connected to the support unit; the rotating unit is connected to the positioning unit; the positioning unit is connected to the correction unit; the rotating unit is connected to the punching unit; the punching unit is located above the positioning unit; the punching unit is located above the three-leaf transfer platform (2).

2. The positioning device for a ring-shaped multi-hole punching die according to claim 1, characterized in that, The transfer unit includes a fixed base (101), a first power assembly (102), a rotating shaft frame (103), and a first transmission rod (104); the fixed base (101) is fixedly connected to the left side of the mounting frame (1); the first power assembly (102) is installed at the lower part of the fixed base (101); the rotating shaft frame (103) is fixedly connected to the upper surface of the fixed base (101); the first transmission rod (104) is rotatably connected to the upper part of the rotating shaft frame (103); the lower part of the first transmission rod (104) is fixedly connected to the output shaft of the first power assembly (102); the upper part of the first transmission rod (104) is fixedly connected to the three-lobe transfer table (2).

3. A positioning device for a ring-shaped multi-hole punching die according to claim 2, characterized in that it prevents... The bouncing unit includes a rotating rod (201), an L-shaped plate (202), and a torsion plate (203); a rotating rod (201) is rotatably connected in each recess (2002); an L-shaped plate (202) is fixedly connected to each rotating rod (201), and the upper part of each L-shaped plate (202) is higher than the upper surface of the three-leaf transfer table (2); a torsion spring is provided between each L-shaped plate (202) and the three-leaf transfer table (2).

4. A positioning device for a ring-shaped multi-hole punching die according to claim 3, characterized in that, The supporting unit includes an electric lifting platform (301), a first support plate (302), a first electric actuator (303), a bearing plate (304), a second transmission rod (305), a turntable (306), and a piston rod (307); the electric lifting platform (301) is mounted on the mounting frame (1); two first support plates (302) are fixedly connected to the upper part of the electric lifting platform (301); a first electric actuator (303) is mounted on the upper surface of each of the two first support plates (302); the telescopic parts of the two first electric actuators (303) are jointly fixedly connected to a bearing plate (304), the middle of the bearing plate (304) is hollowed out; the top surface of the bearing plate (304) contacts the three-lobe transfer table (2); the bearing plate (305) is fixedly connected to the three-lobe transfer table (2); the bearing plate (306) is fixedly connected to the three-lobe transfer table (2); the first electric support plate (305) is fixedly connected to the two first electric actuators (306), the second transmission rod (307), the second transmission rod (308), the second transmission rod (309), the second transmission rod (3005), the second transmission rod (3006), the second transmission rod (3007), the second transmission rod (3005), the second transmission rod (3006 ... 4) Several vertical slots (30401) are opened on the upper part, and the bottom of the vertical slots (30401) is sealed; several piston rods (307) are slidably connected on the bearing plate (304); each piston rod (307) is located in a vertical slot (30401), and the lower part of the piston rod (307) extends out from the vertical slot (30401); each vertical slot (30401) corresponds to a punching hole (2001); a second transmission rod (305) is rotatably connected on the electric lifting platform (301); a turntable (306) is fixedly connected to the upper part of the second transmission rod (305), and an annular protrusion is provided on the upper edge of the turntable (306); the turntable (306) is connected to the rotating unit; the piston rod (307) is connected to the rotating unit.

5. A positioning device for a ring-shaped multi-hole punching die according to claim 4, characterized in that, The rotating unit includes a support beam (401), a second power assembly (402), a second support plate (403), a third transmission rod (404), a gear (405), and a gear ring (406); the support beam (401) is fixedly connected to the mounting bracket (1); the support beam (401) is connected to the positioning unit; the upper part of the support beam (401) is connected to the punching unit; the support beam (401) is located to the right of the electric lifting platform (301); the second power assembly (402) is installed on the left side of the support beam (401); the support beam (401) Two second support plates (403) are fixedly connected to the left side; a third transmission rod (404) is rotatably connected to both second support plates (403); the lower part of the third transmission rod (404) is fixedly connected to the output shaft of the second power assembly (402); a gear (405) is fixedly connected to the upper part of the third transmission rod (404); a gear ring (406) is fixedly connected to the outer ring surface of the turntable (306); the right side of the gear ring (406) meshes with the gear (405); the gear ring (406) is used to contact and cooperate with the piston rod (307).

6. A positioning device for a ring-shaped multi-hole punching die according to claim 5, characterized in that, The positioning unit includes a second electric actuator (501), a connecting plate (502), a slide rod (503), and a positioning plate (504); the second electric actuator (501) is installed on the right side of the support beam (401); the connecting plate (502) is fixedly connected to the telescopic part of the second electric actuator (501); the slide rod (503) is fixedly connected to the upper part of the connecting plate (502); the slide rod (503) is connected to the correction unit; the outer surface of the slide rod (503) is slidably connected to the support beam (401); the positioning plate (504) is slidably connected to the left side of the slide rod (503), and the positioning plate (504) is a teardrop-shaped protrusion; the positioning plate (504) is slidably connected to the support beam (401); a T-shaped groove (50401) is opened on the left side of the positioning plate (504); a hollowed-out groove (50402) is opened on the right side of the positioning plate (504); and an opening groove (50403) is opened at the front and rear of the positioning plate (504).

7. A positioning device for a ring-shaped multi-hole punching die according to claim 6, characterized in that, The correction unit includes a wing plate (601), a contact rod (602), an annular ring (603), and an elastic element (604); a wing plate (601) is rotatably connected to the front and rear of the positioning plate (504); each of the two wing plates (601) is located in an opening slot (50403); a torsion spring is provided between each of the two wing plates (601) and the positioning plate (504); a contact rod (602) is slidably connected to the front and rear of the positioning plate (504); each of the two contact rods (602) is connected to a contact rod on its opposite side. A wing plate (601) is in contact with the transmission; two contact rods (602) are fixedly connected to an annular ring (603) on opposite sides, the annular ring (603) is a deformable elliptical spring ring; the annular ring (603) is located in the T-shaped groove (50401); the right part of the annular ring (603) is in contact with the slide rod (503); the left part of the slide rod (503) is fixedly connected to an elastic element (604); the left part of the elastic element (604) is fixedly connected to the positioning plate (504); the elastic element (604) is located in the hollowed-out groove (50402).

8. A positioning device for a ring-shaped multi-hole punching die according to claim 7, characterized in that, The punching unit includes a third support plate (701), a hydraulic press (702), an annular plate (703), a tool holder (704), and a punch (705); the third support plate (701) is fixedly connected to the upper part of the support beam (401); two hydraulic presses (702) are installed on the third support plate (701); the annular plate (703) is fixedly connected to the lower part of the two hydraulic presses (702); three tool holders (704) are installed on the lower part of the annular plate (703); several punches (705) are installed on each of the three tool holders (704); each punch (705) corresponds to a punching hole (2001); each punch (705) corresponds to a vertical slot (30401).

9. A positioning device for a ring-shaped multi-hole punching die according to claim 1, characterized in that, The three-leaf transfer station (2) is shaped like a clover.

10. A positioning device for a ring-shaped multi-hole punching die according to claim 3, characterized in that, The upper part of the L-shaped plate (202) is curved, and anti-slip rubber material is provided on its curved surface.

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