Pressing device and method for thin-wall powder metallurgy shaft sleeve

Abstract

The invention relates to the technical field of shaft sleeve pressing, in particular to a thin-wall powder metallurgy shaft sleeve pressing device and method.The device comprises a base, a stamping mechanism, a discharging mechanism and a buffering mechanism, the stamping mechanism, the discharging mechanism and the buffering mechanism are installed on the base, a workbench is installed on the stamping mechanism, a feeding mechanism is installed on the workbench, and a cleaning mechanism is installed on one side of the feeding mechanism; the feeding mechanism is connected to the workbench in a sliding mode, the feeding mechanism is responsible for injecting metal powder into the discharging mechanism, the feeding mechanism can be used for feeding, the cleaning mechanism is installed on the side wall of the feeding mechanism, the cleaning mechanism firstly abuts against the ejected pressed blank to push the pressed blank to the workbench before feeding, then the cleaning mechanism makes contact with the surface of the workbench, and the pressed blank is cleaned through the cleaning mechanism. Metal powder scattered on the workbench can be scraped and collected when a pressed blank is pushed and discharged, waste is avoided, a sponge mat is always pressed by a spring, the sponge mat is always in contact with the workbench, the cleaning effect is improved, and the shell is prevented from being blocked when sliding.

Description

Technical Field

[0001] The invention relates to the technical field of shaft sleeve pressing, in particular to a pressing device and method for a thin-walled powder metallurgy shaft sleeve. Background Art

[0002] Thin-walled powder metallurgy bushings are bushings with thin-wall structures manufactured using powder metallurgy technology. Powder metallurgy technology presses and sinters metal powders into a porous structure that can achieve self-lubrication after being wetted with hot oil. The manufacturing process includes steps such as powder mixing, pressing, and sintering. Powder metallurgy technology can achieve near-net shape. The pressing principle is to press metal powders (such as iron-based, copper-based, etc.) into shape in a mold using a powder metallurgy press. After the powder is loaded into the female mold, the upper and lower dies apply pressure to generate mechanical wedging and interatomic attraction between the powder particles, forming a dense compact with a certain strength.

[0003] However, when the current thin-walled powder metallurgy sleeve is pressed by metallurgical equipment, the metal powder is poured into the interior of the bottom die through the automatic feeding mechanism, and then the upper die is driven by the hydraulic cylinder to punch. During the feeding, some metal powder will fall onto the workbench. Currently, a sponge pad is pasted on the side of the feeding mechanism. When the feeding mechanism pushes the pressed blank, the powder dropped on the workbench is pushed and collected by the sponge. The sponge will wear out due to long-term friction with the surface of the workbench. The sponge pad is bonded to the shell containing the powder, and it is difficult to adjust the distance between the sponge pad and the workbench. When the sponge pad After the bottom is worn, it cannot contact the surface of the workbench. The powder that falls on the surface of the workbench is difficult to collect. On the one hand, the metal powder falls and is wasted as the shaft sleeve compact is pushed. On the other hand, too much powder accumulation affects the sliding of the feeding mechanism. When loading, the outer shell needs to be swung back and forth by the hydraulic cylinder to achieve the purpose of unloading. This operation is likely to cause more powder to fall. There is no stirring component inside the outer shell. When unloading, the powder is easy to be blocked, making it difficult to unload. The pressed compacts are pushed down one by one by the feeding mechanism. When unloading, the compacts are not buffered and fall directly into the collecting device, so they are easily bumped and damaged. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a method, a device and a method for processing a base fabric of electronic packaging synthetic leather.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a pressing device for a thin-walled powder metallurgy bushing, including a base and a stamping mechanism, a blanking mechanism, and a buffer mechanism installed on the base. A workbench is installed on the stamping mechanism. The blanking mechanism is connected to the workbench. A feeding mechanism is installed on the workbench, and a cleaning mechanism is installed on one side of the feeding mechanism; the feeding mechanism includes a housing, the housing is slidably connected to the workbench, the cleaning mechanism includes a fixing plate, the fixing plate is fixedly connected to the side wall of the housing, a plurality of sliding columns are slidably connected to the fixing plate at equal intervals, the bottom of the plurality of sliding columns is fixedly connected with a mounting plate, a spring is clamped between the mounting plate and the fixing plate, the bottom of the mounting plate is fixedly connected with a sponge pad, the bottom of the sponge pad abuts against the surface of the workbench, a plurality of blanking ports are linearly arranged on the workbench, and a bottom shell is fixedly connected to the bottom of the workbench, and the bottom shell is communicated with the blanking ports.

[0006] Specifically, the cleaning mechanism further includes a collection pipe, the collection pipe is connected to the side of the bottom shell, and the inside of the bottom shell is inclined.

[0007] Specifically, the feeding mechanism further includes a hydraulic cylinder three, the hydraulic cylinder three is installed on the workbench, the telescopic end of the hydraulic cylinder three is fixedly connected to the side wall of the housing, a leakage port is opened at the bottom of the housing, and a feeding pipe is installed on the side wall of the housing.

[0008] Specifically, the feeding mechanism further includes a rotating shaft, the side of the housing is rotatably connected to the rotating shaft, a stirring blade is installed at the end of the rotating shaft, the stirring blade is located above the leakage port, a chute is provided on the workbench, and a roller is fixedly connected to the end of the rotating shaft, and the roller is in rolling connection with the inside of the chute.

[0009] Specifically, the blanking mechanism includes two hydraulic cylinders two, two hydraulic cylinders two are oppositely installed on the base, the telescopic ends of the two hydraulic cylinders two are fixedly connected to the bottom of the base, a material groove is opened on the workbench and is located on the same straight line as the leakage port, a lower die fixedly connected to the workbench is arranged inside the material groove, an upper ring is slidably connected to the outside of the cylindrical lower die, a plurality of connecting rods are fixedly arranged at equal intervals in a circular array at the bottom of the upper ring, the connecting rods are fixedly connected to the workbench, and a support column is fixedly connected to the bottom of the plurality of connecting rods, and the support column is fixedly connected to the base.

[0010] Specifically, the stamping mechanism includes a sliding rod, four sliding rods are fixedly connected to the base in a rectangular array, a top plate is fixedly connected to the four sliding rods, a hydraulic cylinder one is installed at the bottom of the top plate, and the telescopic end of the hydraulic cylinder one is fixedly connected to an upper die opposite to the material groove.

[0011] Specifically, the buffer mechanism includes a mounting frame, the side wall of the base is fixedly connected to the mounting frame, a protective cover with a central control cylindrical structure is fixedly connected to the mounting frame, gear rings are fitted on both sides of the protective cover, a plurality of fixed shafts are equidistantly welded between two of the gear rings, plastic sheets are fixedly connected to the plurality of fixed shafts, and a discharge port is provided at the bottom of the protective cover.

[0012] Specifically, the length of a single plastic sheet is greater than the distance between two adjacent fixed shafts, and the width of the plastic sheet is equal to the distance between two gear rings.

[0013] Specifically, the buffer mechanism also includes a motor, a gear and a baffle. A motor is installed on the top of the protective cover. The output end of the motor is keyed to a gear, which is meshed with a gear ring. A baffle that contacts the gear ring is fixedly connected to the bottom edge of the workbench.

[0014] The operating method of the pressing device of the thin-walled powder metallurgy sleeve comprises the following steps:

[0015] S1: First, add metal powder into the upper feeding mechanism, ensure that the lower feeding mechanism is in an open state, and add metal powder into the lower feeding mechanism by moving the upper feeding mechanism. After adding, the upper feeding mechanism is reset and waits for pressing;

[0016] S2: Then, the punching mechanism is started to move toward the lower feeding mechanism to complete the pressing of the green sheet. After the pressing, the punching mechanism is reset and the lower feeding mechanism is contracted. At this time, the green sheet is ejected. The loading mechanism is started again to extrude the green sheet toward the end of the workbench to complete the unloading of the green sheet. The green sheet will not leak when unloading. After the green sheet is pushed, the lower feeding mechanism is reset and the loading mechanism is continued to be pushed. At this time, the loading mechanism can add powder to the lower feeding mechanism again to complete the addition of metal powder for the next green sheet.

[0017] S3: Finally, the feeding mechanism pushes and collects the powder on the workbench when pushing the green sheets. The green sheets are pushed into the buffer mechanism one by one. The falling green sheets are buffered by the buffer mechanism, and a container for the green sheets is placed on the buffer mechanism.

[0018] The beneficial effects of the present invention are:

[0019] (1) The pressing device for the thin-walled powder metallurgy bushing of the present invention is provided with a feeding mechanism slidably connected to the workbench. The feeding mechanism is responsible for injecting metal powder into the internal part of the discharging mechanism. The feeding mechanism can not only feed materials, but also a cleaning mechanism is installed on the side wall of the feeding mechanism. Before feeding, the cleaning mechanism first contacts the ejected green compact and pushes it onto the workbench, and then the cleaning mechanism contacts the surface of the workbench. When pushing the green compact for discharging, it can also scrape and collect the metal powder scattered on the workbench to avoid waste. Moreover, the sponge pad is always pressed by the spring, so that the sponge pad always contacts the workbench, improving the cleaning effect and preventing jamming when the outer shell slides.

[0020] (2) The pressing device for the thin-walled powder metallurgy bushing of the present invention is provided with a rotating shaft rotatably connected to the inside of the outer shell. When the outer shell slides inside the workbench, the roller at the end of the rotating shaft rolls on the workbench. Further, the roller transmits power to the rotating shaft, and the rotating shaft drives the stirring blade inside the outer shell to rotate, realizing stirring inside the outer shell when the outer shell is moving for feeding, and preventing blockage when the metal powder is being discharged.

[0021] (3) The pressing device for the thin-walled powder metallurgy bushing of the present invention is provided with a buffer mechanism installed on one side of the base. When the feeding mechanism pushes the bushing green compacts piled up on the workbench, each time metal powder is fed and cleaned, one green compact on the workbench is pushed. The dropped green compact falls into the inside of the protective cover and contacts the plastic sheet. As the motor drives the rotation of the toothed ring, the plastic sheet located inside the protective cover will not unfold, and only the plastic sheet at the discharge opening gradually opens as the toothed ring rotates, realizing buffering when the green compact falls into the inside of the collection container and preventing damage. Brief Description of the Drawings

[0022] The present invention will be further described below in conjunction with the drawings and embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the pressing device and method for the thin-walled powder metallurgy bushing provided by the present invention;

[0024] Figure 2 It is a schematic diagram of the connection structure of the workbench, the second hydraulic cylinder and the support column of the present invention;

[0025] Figure 3 It is a schematic diagram of the connection structure of the outer shell, the rotating shaft and the stirring blade of the present invention;

[0026] Figure 4 It is a schematic diagram of the connection structure of the outer shell, the fixing plate and the sliding column of the present invention;

[0027] Figure 5 It is a schematic diagram of the connection structure of the workbench, the lower mold and the material tank of the present invention;

[0028] Figure 6 Schematic diagram of the connection structure of the support column, connecting rod and top ring of the present invention;

[0029] Figure 7 Schematic diagram of the connection structure of the workbench, bottom shell and collection pipe of the present invention;

[0030] Figure 8 Schematic diagram of the connection structure of the toothed ring, fixed shaft and plastic sheet of the present invention.

[0031] In the figure: 1. Base; 2. Stamping mechanism; 201. Slide bar; 202. Top plate; 203. Hydraulic cylinder I; 204. Upper die; 3. Workbench; 4. Material discharging mechanism; 401. Hydraulic cylinder II; 402. Material trough; 403. Support column; 404. Top ring; 405. Lower die; 406. Connecting rod; 5. Feeding mechanism; 501. Outer shell; 502. Feed pipe; 503. Hydraulic cylinder III; 504. Chute; 505. Roller; 506. Stirring blade; 507. Rotating shaft; 508. Leakage port; 6. Cleaning mechanism; 601. Fixed plate; 602. Slide column; 603. Discharging port; 604. Bottom shell; 605. Collection pipe; 606. Mounting plate; 607. Sponge pad; 608. Spring; 7. Buffer mechanism; 701. Protective cover; 702. Motor; 703. Gear; 704. Toothed ring; 705. Fixed shaft; 706. Feeding port; 707. Plastic sheet; 708. Mounting bracket; 709. Baffle. Detailed implementation manners

[0032] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0033] Such as Figures 1 - 8As shown in the figure, the pressing device for the thin-walled powder metallurgy bushing of the present invention includes a base 1, a stamping mechanism 2, a blanking mechanism 4, and a buffer mechanism 7 mounted on the base 1. A workbench 3 is installed on the stamping mechanism 2. The blanking mechanism 4 is connected to the workbench 3. A feeding mechanism 5 is installed on the workbench 3. A cleaning mechanism 6 is installed on one side of the feeding mechanism 5. The feeding mechanism 5 includes a housing 501 which is slidably connected to the workbench 3. The cleaning mechanism 6 includes a fixing plate 601 which is fixedly connected to the side wall of the housing 501. A plurality of sliding columns 602 are slidably connected to the fixing plate 601 at equal intervals. The bottom of the plurality of sliding columns 602 is fixedly connected to a mounting plate 606. A spring 608 is clamped between the mounting plate 606 and the fixing plate 601. The bottom of the mounting plate 606 is fixedly connected to a sponge pad 607. The bottom of the sponge pad 607 abuts against the surface of the workbench 3. A plurality of blanking openings 603 are arranged in a linear array on the workbench 3. The bottom of the workbench 3 is fixedly connected to a bottom shell 604 which is communicated with the blanking openings 603. The cleaning mechanism 6 further includes a collecting pipe 605 which is connected to the side of the bottom shell 604. The inside of the bottom shell 604 is inclined. The blanking mechanism 4 includes two second hydraulic cylinders 401 which are oppositely installed on the base 1. The telescopic ends of the two second hydraulic cylinders 401 are fixedly connected to the bottom of the base 1. A material groove 402 which is located on the same straight line as the leakage opening 508 is formed on the workbench 3. A lower mold 405 which is fixedly connected to the workbench 3 is arranged inside the material groove 402. A top ring 404 is slidably connected to the outside of the cylindrical lower mold 405. A plurality of connecting rods 406 are fixedly arranged at equal intervals in a circular array at the bottom of the top ring 404. The connecting rods 406 are fixedly connected to the workbench 3. The bottom of the plurality of connecting rods 406 is fixedly connected to a support column 403 which is fixedly connected to the base 1. The stamping mechanism 2 includes sliding rods 201. Four sliding rods 201 are fixedly connected in a rectangular array on the base 1. A top plate 202 is fixedly connected to the four sliding rods 201. A first hydraulic cylinder 203 is installed at the bottom of the top plate 202. The telescopic end of the first hydraulic cylinder 203 is fixedly connected to an upper mold 204 which is opposite to the material groove 402.Connect the feed pipe 502 to the feed pipe of the suction pump, and metal powder can be added to the inside of the housing 501. When pressing the bushing, ensure that the two hydraulic cylinders II 401 are in the extended state. At this time, the top ring 404 abuts against the workbench 3. Start the hydraulic cylinder III 503 to push the housing 501 to move on the surface of the workbench 3. As the housing 501 moves, when the leakage port 508 at its bottom corresponds to the material tank 402, the metal powder can be added from the inside of the housing 501 to the inside of the material tank 402. After the addition is completed, the hydraulic cylinder III 503 can be contracted, and the housing 501 is reset to avoid affecting the pressing. Start the hydraulic cylinder I 203 at the bottom of the top plate 202 to move the upper die 204 in the direction of the lower die 405 to complete the pressing of the bushing green compact. After the pressing is completed, the hydraulic cylinder I 203 is reset, and then the two hydraulic cylinders II 401 are contracted to drive the workbench 3 to descend. As the workbench 3 descends, since the top ring 404 is supported by the support column 403 and the connecting rod 406 and does not move, as the workbench 3 descends, the pressed bushing green compact is flush with the workbench 3. At this time, start the hydraulic cylinder III 503 to make the housing 501 drive the sponge pad 607 to push the pressed bushing green compact to the surface of the workbench 3. Then the hydraulic cylinder III 503 is contracted, and the hydraulic cylinder II 401 is extended. At this time, the material tank 402 is formed, waiting for the next powder addition. Similarly, more green compacts can be pressed. After the sponge pad 607 pushes the green compact to the workbench 3 and the workbench 3 is reset, continue to push the housing 501 to feed. When the housing 501 moves, it drives the sponge pad 607 to push and collect the metal powder scattered on the surface of the workbench 3. And the mounting plate 606 on the sponge pad 607 is always pressed by the spring 608 at the bottom of the fixing plate 601, which realizes that the sponge pad 607 can always be in contact with the surface of the workbench 3, avoiding its wear and inability to contact the workbench 3. Then, with each push of the housing 501, the sponge pad 607 will push the metal powder. As the powder is pushed more and more, the metal powder will flow from the material discharge port 603 on the surface of the workbench 3 to the inside of the bottom case 604. Since the bottom of the bottom case 604 is inclined, the powder will fall into the inside of the collection pipe 605. Place a storage container at its bottom to collect the powder and reduce waste.;

[0034] Specifically, refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the feeding mechanism 5 further includes a third hydraulic cylinder 503. The third hydraulic cylinder 503 is installed on the workbench 3. The telescopic end of the third hydraulic cylinder 503 is fixedly connected to the side wall of the housing 501. A material leakage port 508 is formed at the bottom of the housing 501, and a feed pipe 502 is installed on the side wall of the housing 501. The feeding mechanism 5 further includes a rotating shaft 507. The rotating shaft 507 is rotatably connected to the side of the housing 501. A stirring blade 506 is installed at the end of the rotating shaft 507. The stirring blade 506 is located above the material leakage port 508. A chute 504 is provided on the workbench 3. A roller 505 is fixedly connected to the end of the rotating shaft 507. The roller 505 is in rolling connection with the inside of the chute 504. When the housing 501 is pushed by the third hydraulic cylinder 503 to inject powder into the material tank 402, the roller 505 rolls on the surface of the workbench 3. As the roller 505 rolls, the rotating shaft 507 is driven to rotate accordingly. When the rotating shaft 507 rotates, the stirring blade 506 stirs the metal powder inside the housing 501, preventing caking and ensuring that the powder can fall into the material leakage port 508 and be fed into the material tank 402. Moreover, the third hydraulic cylinder 503 does not need to swing back and forth to shake the metal powder inside the housing 501, reducing the wear of the housing 501.

[0035] Specifically, referring to Figure 1 , Figure 2 and Figure 8As shown in the figure, the buffer mechanism 7 includes a mounting bracket 708. The side wall of the base 1 is fixedly connected to the mounting bracket 708. A protective cover 701 with a central control cylindrical structure is fixedly connected to the mounting bracket 708. Tooth rings 704 are attached to both sides of the protective cover 701. A plurality of fixed shafts 705 are welded at equal intervals between the two tooth rings 704. Plastic sheets 707 are fixedly connected to the plurality of fixed shafts 705. A discharge opening 706 is provided at the bottom of the protective cover 701; the length of a single plastic sheet 707 is greater than the distance between two adjacent fixed shafts 705, and the width of the plastic sheet 707 is equal to the distance between the two tooth rings 704; the buffer mechanism 7 further includes a motor 702, a gear 703 and a baffle 709. A motor 702 is installed on the top of the protective cover 701. The output end of the motor 702 is key-connected to a gear 703. The gear 703 meshes with the tooth ring 704. A baffle 709 that abuts against the tooth ring 704 is fixedly connected to the bottom edge of the workbench 3; the pressed bush blanks will be pushed onto the surface of the workbench 3 one by one. As the number of bushings increases, the outermost bushing is always pushed and dropped by other bushings on the workbench 3. The dropped bushing blanks will fall onto the plastic sheets 707 inside the protective cover 701, and the baffle 709 can prevent the bushings from bouncing out of the protective cover 701. Except for the plastic sheet 707 at the discharge opening 706, the other plastic sheets 707 are always in a retracted state, that is, blocked by the protective cover 701. As the motor 702 drives the rotation of the gear 703, one of the tooth rings 704 will also be driven, that is, there is always a plastic sheet 707 that disengages from the clamping of the protective cover 701 and the fixed shaft 705, and the plastic sheet 707 at the discharge opening 706 slowly opens, realizing buffering when the bushings fall from the plastic sheet 707 into the collection container to avoid damage.

[0036] The operation method of the pressing device for thin-walled powder metallurgy bushings includes the following steps:

[0037] S1: First, add metal powder into the feeding mechanism 5, ensure that the discharging mechanism 4 is in an open state, add metal powder into the discharging mechanism 4 by moving the feeding mechanism 5, and after adding, the feeding mechanism 5 resets and waits for pressing;

[0038] S2: Then, start the stamping mechanism 2 to move it in the direction of the discharging mechanism 4 to complete the pressing of the blank. After pressing, the stamping mechanism 2 resets, contracts the discharging mechanism 4. At this time, the blank is ejected. Start the feeding mechanism 5 again to extrude the blank to the end of the workbench 3 to complete the blank discharging. And when discharging the blank, there is no material leakage. After the blank is pushed, the discharging mechanism 4 is reset, continue to push the feeding mechanism 5, and at this time, the feeding mechanism 5 can add powder into the discharging mechanism 4 again to complete the addition of metal powder for the next blank;

[0039] S3: Finally, when the blank feeding mechanism 5 pushes the green compact, it also pushes and collects the powder on the workbench 3. The pushed green compacts are successively pushed into the inside of the buffer mechanism 7, and the buffer mechanism 7 buffers the dropped green compacts. A container for holding the green compacts can be placed on the buffer mechanism 7.

[0040] When the present invention is in use, first, connect the feed pipe 502 to the feed pipe of the suction pump, and metal powder can be added into the inside of the housing 501. When pressing the bushing, ensure that the two hydraulic cylinders II 401 are in the extended state. At this time, the top ring 404 abuts against the workbench 3. Start the hydraulic cylinder III 503 to drive the housing 501 to move on the surface of the workbench 3. As the housing 501 moves, when the leakage port 508 at its bottom corresponds to the material groove 402, the metal powder can be added from the inside of the housing 501 into the inside of the material groove 402. After the addition is completed, the hydraulic cylinder III 503 can be contracted, and the housing 501 returns to its original position to avoid affecting the pressing. Start the hydraulic cylinder I 203 at the bottom of the top plate 202 to move the upper die 204 in the direction of the lower die 405 to complete the pressing of the bushing green compact. After the pressing is completed, the hydraulic cylinder I 203 returns to its original position. Then, contract the two hydraulic cylinders II 401 to drive the workbench 3 to descend. As the workbench 3 descends, since the top ring 404 is supported by the support column 403 and the connecting rod 406 and does not move, as the workbench 3 descends, the pressed bushing green compact is flush with the workbench 3. At this time, start the hydraulic cylinder III 503 to drive the housing 501 to drive the sponge pad 607 to push the pressed bushing green compact onto the surface of the workbench 3. Then, the hydraulic cylinder III 503 contracts, and the hydraulic cylinder II 401 extends. At this time, the material groove 402 is formed, waiting for the next powder addition. Similarly, more green compacts can be pressed. After the sponge pad 607 pushes the green compact to move onto the workbench 3 and the workbench 3 returns to its original position, continue to push the housing 501 to discharge materials. When the housing 501 moves, it drives the sponge pad 607 to push and collect the metal powder scattered on the surface of the workbench 3. And the mounting plate 606 on the sponge pad 607 is always pressed by the spring 608 at the bottom of the fixing plate 601, which realizes that the sponge pad 607 can always be in contact with the surface of the workbench 3, avoiding its wear and inability to contact the workbench 3. Then, with each push of the housing 501, the sponge pad 607 will push the metal powder. As the powder is pushed more and more, the metal powder will flow from the material discharge port 603 on the surface of the workbench 3 into the inside of the bottom case 604. Since the bottom of the bottom case 604 is inclined, the powder will fall into the inside of the collection pipe 605. Place a storage container at its bottom to collect the powder and reduce waste.

[0041] Then, when the outer shell 501 is pushed by the third hydraulic cylinder 503 into the interior of the feed trough 402 to inject powder, the roller 505 rolls on the surface of the workbench 3. As the roller 505 rolls, the rotating shaft 507 is driven to rotate accordingly. When the rotating shaft 507 rotates, the stirring blade 506 stirs the metal powder inside the outer shell 501, preventing caking and ensuring that the powder can fall into the interior of the leakage port 508 and be added to the interior of the feed trough 402. Moreover, the third hydraulic cylinder 503 does not need to swing back and forth to shake the metal powder inside the outer shell 501, reducing the wear of the outer shell 501.

[0042] Finally, the pressed bushing blanks are pushed one by one onto the surface of the workbench 3. As the number of bushings increases, the outermost bushing is always pushed and dropped by the other bushings on the workbench 3. The dropped bushing blanks fall onto the plastic sheet 707 inside the protective cover 701, and the baffle 709 can prevent the bushings from bouncing out of the protective cover 701. Except for the plastic sheet 707 at the material discharge port 706, the other plastic sheets 707 are always in a retracted state, that is, blocked by the protective cover 701. As the motor 702 drives the rotation of the gear 703, one of the toothed rings 704 is also driven, which means that one plastic sheet 707 is always released from the clamping between the protective cover 701 and the fixed shaft 705, and the plastic sheet 707 at the material discharge port 706 slowly opens, providing a buffer when the bushings fall from the plastic sheet 707 into the interior of the collection container to avoid damage.

[0043] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed by the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0044] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Pressing device for thin-walled powder metallurgy bushing, characterized in that, It includes a base (1), a stamping mechanism (2), a blanking mechanism (4) and a buffer mechanism (7) installed on the base (1). A workbench (3) is installed on the stamping mechanism (2). The blanking mechanism (4) is connected to the workbench (3). A loading mechanism (5) is installed on the workbench (3). A cleaning mechanism (6) is installed on one side of the loading mechanism (5). The loading mechanism (5) includes a housing (501). The housing (501) is slidably connected to the workbench (3). The cleaning mechanism (6) includes a fixing plate (601). The fixing plate (601) is fixedly connected to the side wall of the housing (501). A plurality of sliding columns (602) are slidably connected to the fixing plate (601) at equal intervals. The bottom of the plurality of sliding columns (602) is fixedly connected to a mounting plate (606). A spring (608) is clamped between the mounting plate (606) and the fixing plate (601). A sponge pad (607) is fixedly connected to the bottom of the mounting plate (606). The bottom of the sponge pad (607) abuts against the surface of the workbench (3). A plurality of blanking ports (603) are arranged in a linear array on the workbench (3). A bottom shell (604) is fixedly connected to the bottom of the workbench (3). The bottom shell (604) is communicated with the blanking ports (603).

2. The pressing device for the thin-walled powder metallurgy bushing according to claim 1, wherein: The cleaning mechanism (6) further includes a collecting pipe (605). The collecting pipe (605) is connected to the side of the bottom shell (604). The inside of the bottom shell (604) is inclined.

3. The pressing device for the thin-walled powder metallurgy bushing according to claim 1, characterized in that: The loading mechanism (5) further includes a third hydraulic cylinder (503). The third hydraulic cylinder (503) is installed on the workbench (3). The telescopic end of the third hydraulic cylinder (503) is fixedly connected to the side wall of the housing (501). A material leakage port (508) is opened at the bottom of the housing (501). A feed pipe (502) is installed on the side wall of the housing (501).

4. The pressing device for the thin-walled powder metallurgy bushing according to claim 3, wherein: The loading mechanism (5) further includes a rotating shaft (507). The rotating shaft (507) is rotatably connected to the side of the housing (501). A stirring blade (506) is installed at the end of the rotating shaft (507). The stirring blade (506) is located above the material leakage port (508). A chute (504) is provided on the workbench (3). A roller (505) is fixedly connected to the end of the rotating shaft (507). The roller (505) is in rolling connection with the inside of the chute (504).

5. The pressing device for the thin-walled powder metallurgy bushing according to claim 3, characterized in that: The blanking mechanism (4) includes two second hydraulic cylinders (401). Two second hydraulic cylinders (401) are oppositely installed on the base (1). The telescopic ends of the two second hydraulic cylinders (401) are fixedly connected to the bottom of the base (1). A material groove (402) is formed on the workbench (3) and is located on the same straight line as the material leakage port (508). A lower die (405) fixedly connected to the workbench (3) is arranged inside the material groove (402). A top ring (404) is slidably connected to the outer side of the cylindrical lower die (405). A plurality of connecting rods (406) are fixedly arranged at equal intervals in a circular array at the bottom of the top ring (404). The connecting rods (406) are fixedly connected to the workbench (3). A support column (403) is fixedly connected to the bottom of the plurality of connecting rods (406). The support column (403) is fixedly connected to the base (1).

6. The pressing device for the thin-walled powder metallurgy bushing according to claim 5, characterized in that: The stamping mechanism (2) includes a slide rod (201). Four slide rods (201) are fixedly connected to the base (1) in a rectangular array. A top plate (202) is fixedly connected to the four slide rods (201). A first hydraulic cylinder (203) is installed at the bottom of the top plate (202). The telescopic end of the first hydraulic cylinder (203) is fixedly connected to an upper die (204) opposite to the material groove (402).

7. The pressing device for the thin-walled powder metallurgy bushing according to claim 2, wherein: The buffer mechanism (7) includes a mounting frame (708). The mounting frame (708) is fixedly connected to the side wall of the base (1). A protective cover (701) with a central control cylindrical structure is fixedly connected to the mounting frame (708). Tooth rings (704) are attached to both sides of the protective cover (701). A plurality of fixed shafts (705) are welded at equal intervals between the two tooth rings (704). A plastic sheet (707) is fixedly connected to each of the plurality of fixed shafts (705). A material discharge port (706) is arranged at the bottom of the protective cover (701).

8. The pressing device for the thin-walled powder metallurgy bushing according to claim 7, characterized in that: The length of a single plastic sheet (707) is greater than the distance between adjacent fixed shafts (705), and the width of the plastic sheet (707) is equal to the distance between the two tooth rings (704).

9. The pressing device for the thin-walled powder metallurgy bushing according to claim 7, wherein: The buffer mechanism (7) further includes a motor (702), a gear (703), and a baffle (709). The motor (702) is installed at the top of the protective cover (701). The output end of the motor (702) is key-connected to the gear (703). The gear (703) meshes with the tooth ring (704). A baffle (709) that abuts against the tooth ring (704) is fixedly connected to the bottom edge of the workbench (3).

10. The operating method of the pressing device for the thin-walled powder metallurgy bushing according to any one of claims 1-9, characterized in that, Including the following steps: S1: First, add metal powder into the feeding mechanism (5), ensure that the blanking mechanism (4) is in an open state, add metal powder into the blanking mechanism (4) by moving the feeding mechanism (5), and after adding, the feeding mechanism (5) resets and waits for pressing; S2: Then, start the stamping mechanism (2) and move it towards the blanking mechanism (4) to complete the pressing of the green compact. After pressing, the stamping mechanism (2) resets, and the blanking mechanism (4) contracts. At this time, the green compact is ejected. Then, start the feeding mechanism (5) again to extrude the green compact towards the end of the workbench (3), completing the blanking of the green compact. Moreover, there will be no material leakage during the blanking of the green compact. After the green compact is pushed, reset the blanking mechanism (4), continue to push the feeding mechanism (5), and at this time, the feeding mechanism (5) can add powder into the interior of the blanking mechanism (4) again to complete the addition of metal powder for the next green compact. S3: Finally, when the feeding mechanism (5) pushes the green compact, it also pushes and collects the powder on the workbench (3). The pushed green compacts are successively pushed into the interior of the buffer mechanism (7). The buffer mechanism (7) buffers the falling green compacts, and a container for holding the green compacts can be placed on the buffer mechanism (7).

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