Powder metallurgy gear compression molding device

Abstract

The invention relates to the field of metal powder forming machining, in particular to a powder metallurgy gear pressing forming device. The device comprises a compression molding and demolding mechanism, a feeding and pushing mechanism and a conveying and powder cleaning mechanism, the pressing forming and demolding mechanism comprises a base, a forming table arranged on the base, a pressing assembly arranged on the forming table and a demolding assembly arranged on the base, and the forming table is provided with a forming groove; the feeding and pushing mechanism comprises a feeding assembly and a pushing assembly which is connected with the feeding assembly and can move in the transverse direction. The conveying and powder removing mechanism comprises a conveying belt assembly, a stirring assembly, a powder pumping assembly, a powder collecting assembly and a linkage assembly for linkage of the pushing assembly and the powder pumping assembly, the conveying belt assembly is arranged on one transverse side of the forming table, and the stirring assembly is in transmission connection with the conveying belt assembly. When a gear workpiece is pushed out, powder can be automatically shaken off in a bumping mode and collected, and recycling is facilitated.

Description

Technical Field

[0001] The invention relates to the field of metal powder forming and processing, in particular to a powder metallurgy gear pressing and forming device. Background Art

[0002] Powder metallurgy gears are powder metallurgy parts that are made through a one-time forming and finishing process. They can fully meet the dimensional accuracy requirements, especially the tooth profile accuracy, and the forming process is fast and efficient.

[0003] Chinese patent announcement number CN209452801U discloses a powder metallurgy gear pressing and forming device, including a base, a shock absorbing mechanism, a forming mechanism, a pressing mechanism and a filling mechanism, the forming mechanism is provided with a demoulding hydraulic cylinder, a first proximity switch is provided on the side of the demoulding hydraulic cylinder, the base is fixedly connected with a fixed bracket and a material receiving support frame, the fixed bracket is connected with a second proximity switch and a third detection switch, the pressing mechanism is fixedly connected with a detection iron sheet, a weight detector is provided on the upper side of the material receiving support frame, a tray is provided on the upper side of the weight detector, the tray is provided with a material receiving inclined surface, four sliding rods are provided on the lower side of the tray, the sliding rods pass through the upper surface of the material receiving support frame, a mounting base is provided on one side of the forming mechanism, a pneumatic cylinder is provided on the upper side of the mounting base, a push plate matching the tray is provided on one side of the pneumatic cylinder, the pneumatic cylinder is provided with a fourth proximity switch and a fifth proximity switch, two square grooves are symmetrically provided on the side of the forming mechanism, and the square grooves are connected with a material receiving structure.

[0004] However, the above technical solution has the following shortcomings:

[0005] For the gear workpiece that has been formed, when the gear workpiece is pushed into the tray, powder will be pushed out along with the gear workpiece. The gear workpiece needs to be processed to remove the powder later, which is troublesome. Summary of the invention

[0006] The purpose of the present invention is to address the problems existing in the background technology and to propose a powder metallurgy gear pressing and forming device, which can automatically shake off the powder by bumping when the gear workpiece is pushed out and collect the powder for easy recycling.

[0007] The technical solution of the present invention is a powder metallurgy gear pressing and molding device, including a pressing and molding and demoulding mechanism, a feeding and pushing mechanism and a conveying and cleaning powder mechanism; the pressing and molding and demoulding mechanism includes a base, a molding table arranged on the base, a pressing component arranged on the molding table and a demoulding component arranged on the base, the molding table has a molding groove, and the outer peripheral surface of the molding groove is a tooth-shaped profile; the feeding and pushing mechanism includes a feeding component and a pushing component connected to the feeding component and capable of moving laterally; the conveying and cleaning powder mechanism includes a conveyor belt component, a toggle component, a powder extraction component, a powder collection component and a pushing component and a pumping component. The linkage component of the powder component is linked, the conveyor belt component is arranged on the lateral side of the forming table, and the toggle component is transmission connected with the conveyor belt component; when the pushing component pushes the gear workpiece on the forming table onto the conveyor belt component, the feeding component replenishes powder into the forming groove, the toggle component toggle the conveyor belt component, the powder extraction component creates air negative pressure at the conveyor belt component and pumps the fallen powder into the powder collecting component; when the pushing component moves in the reverse direction to reset, the feeding component flattens the powder in the forming groove and moves away from the top of the forming groove, the powder extraction component creates air negative pressure at the conveyor belt component and pumps the fallen powder into the powder collecting component.

[0008] Preferably, the pressing assembly includes a guide rod vertically arranged on the forming table, a top seat arranged on the guide rod, a lifting platform slidably arranged on the guide rod, a first hydraulic cylinder arranged on the top seat and driving the lifting platform to lift, a connecting tube arranged at the bottom of the lifting platform, and a toothed upper mold arranged at the bottom of the connecting tube, and the toothed upper mold is adapted to the forming groove.

[0009] Preferably, the demolding assembly includes a plurality of pushing columns vertically penetrating and slidingly arranged on the forming table, a lifting plate arranged at the bottom of the pushing columns, and a second hydraulic cylinder arranged on the base and driving the lifting plate to lift and lower. The bottom of the forming table groove has a groove and a slideway. The pushing column includes a pushing table part and a sliding column part that are integrally connected. The pushing table part is located above the sliding column part. The cross-sectional size of the pushing table part is larger than the cross-sectional size of the sliding column part. The pushing table part is adapted to the groove, and the sliding column part is slidably arranged on the slideway.

[0010] Preferably, the feeding assembly includes a bracket arranged on the top seat, a feeding pipe arranged on the bracket and having a flat bottom end, a material box slidably arranged on the upper surface of the forming table, a sealing plate connected to the outer end of the material box, a connecting plate connected to the sealing plate, and a third hydraulic cylinder arranged on the forming table and driving the connecting plate to move laterally. The material box has a discharge port at the bottom and a feed port at the top that can be connected to the bottom end of the feeding pipe. After the feed port of the material box is disconnected from the feeding pipe, the sealing plate blocks the bottom end of the feeding pipe.

[0011] Preferably, a support plate is provided on the side of the forming table, and a roller is rotatably provided on the bottom of the blocking plate, and the roller rolls on the support plate and the forming table.

[0012] Preferably, the pusher assembly includes a connecting frame arranged on the material box and a pushing plate arranged on the connecting frame, and the pushing plate is a U-shaped plate, and the U-shaped opening faces one lateral side.

[0013] Preferably, the conveyor belt assembly includes a mounting frame arranged on the side of the forming table, a first mounting shaft and a second mounting shaft that are damped and rotatably arranged on the mounting frame, a first rotating roller arranged on the first mounting shaft, a second rotating roller arranged on the second mounting shaft, and a conveyor belt sleeved on the first rotating roller and the second rotating roller, the conveyor belt has evenly distributed mesh holes, a connecting plate is arranged on the side of the forming table, the top surface of the connecting plate is flush with the top surface of the forming table and connected to one end of the top of the conveyor belt; the driving assembly includes a first gear arranged on the second mounting shaft, a rotating shaft rotatably arranged on the mounting frame, a second gear coaxially arranged on the rotating shaft and a belt-driving roller, the second gear is meshed and connected to the first gear, and the belt-driving roller has a convex plate portion on the inner upper surface of the driving conveyor belt.

[0014] Preferably, the powder suction assembly includes a powder guiding member arranged on a mounting frame, a piston cylinder having two suction ports at the top and two outlet ports at the bottom, a first suction pipe and a second suction pipe connected to the two suction ports respectively, a first outlet pipe and a second outlet pipe connected to the two outlet ports respectively, and a piston horizontally slidably arranged in the piston cylinder, the powder guiding member includes a bucket-shaped powder receiving hopper and a powder guiding pipe connected to the bottom of the powder receiving hopper, the powder receiving hopper is located on the inner side of the conveyor belt, the powder guiding pipe includes an obliquely distributed oblique pipe portion and a vertical pipe portion connected to the bottom end of the oblique pipe portion, the outer ends of the first suction pipe and the second suction pipe are both connected to the powder guiding pipe, and filters are provided at the connecting points, the first suction pipe is provided with a first one-way valve for unidirectional conduction from the powder guiding pipe to the piston cylinder, the first outlet pipe is provided with a second one-way valve for unidirectional exhaust from the piston cylinder to the outside, the second suction pipe is provided with a third one-way valve for unidirectional conduction from the powder guiding pipe to the piston cylinder, and the second outlet pipe is provided with a fourth one-way valve for unidirectional exhaust from the piston cylinder to the outside.

[0015] Preferably, the linkage assembly includes a rack horizontally arranged on a connecting frame, a mounting ring coaxially arranged on the first mounting shaft, a third gear rotatably arranged on the mounting ring and having a ratchet groove on the end face, a clamping plate rotatably arranged on the mounting ring, a spring connected between the clamping plate and the mounting ring, a fourth gear rotatably arranged on the mounting frame and meshing with the third gear, a connecting rod with one end eccentrically connected to the fourth gear, and a moving rod rotatably connected to the other end of the connecting rod, the moving rod is slidably arranged on the piston cylinder and one inner end is connected to the piston, when the third gear rotates clockwise, the mounting ring is driven to rotate through the clamping plate, and when the third gear rotates counterclockwise, the spring is repeatedly compressed through the clamping plate.

[0016] Preferably, the powder collecting assembly includes a fixed frame arranged on the base, a powder storage container arranged on the fixed frame and a sealing plug detachably connected to the bottom end of the powder storage container, the top end of the powder storage container is connected to the bottom end of the vertical tube portion of the powder guide tube, a cylinder rack is arranged on the fixed frame, and the piston cylinder is installed on the cylinder rack.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] The present invention can automatically shake off the powder by bumping when pushing out the gear workpiece and collect the powder, which is convenient for recycling and avoids the subsequent process of cleaning the gear workpiece separately. When the powder raw material is added to the forming tank through the material box, quantitative replenishment can be achieved to ensure the uniformity of the specifications of the gear workpiece pressed and formed. At the same time, the gear workpiece and the powder that may remain on the gear workpiece and the forming table are pushed out by the push plate, and the pushed powder is shaken off by the conveying and cleaning powder mechanism, and the powder is collected for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0020] Figure 2 A partial structural cross-sectional view of a pressed gear workpiece according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the structure for pushing the gear workpiece onto the conveyor belt and replenishing powder into the forming tank;

[0022] Figure 4 A cross-sectional view of a local structure for shaking off and sucking powder according to an embodiment of the present invention;

[0023] Figure 5 for Figure 4 A magnified view of the structure at center A;

[0024] Figure 6 It is a schematic diagram of the structure of the powder guide.

[0025] Figure numerals: 1, base; 2, forming table; 201, forming groove; 3, guide rod; 4, top seat; 5, lifting platform; 6, toothed upper mold; 7, connecting tube; 8, first hydraulic cylinder; 9, pushing column; 10, lifting plate; 11, second hydraulic cylinder; 12, third hydraulic cylinder; 13, connecting plate; 14, blocking plate; 15, material box; 16, connecting frame; 17, pushing plate; 18, bracket; 19, feeding pipe; 20, supporting plate; 21, roller; 22, connecting plate; 23, rack; 241, first side plate; 242, second side plate; 25, first mounting shaft; 26, first rotating roller; 27, second mounting shaft; 28, second rotating roller ; 29. ​​conveyor belt; 30. first gear; 31. second gear; 32. rotating shaft; 33. belt roller; 34. mounting ring; 35. third gear; 36. clamping plate; 37. spring; 38. fourth gear; 39. connecting rod; 40. moving rod; 41. piston; 42. piston cylinder; 43. cylinder rack; 44. first air extraction pipe; 441. first non-return valve; 45. first air outlet pipe; 451. second non-return valve; 46. second air extraction pipe; 461. third non-return valve; 47. second air outlet pipe; 471. fourth non-return valve; 48. powder guide; 481. powder receiving hopper; 482. powder guide pipe; 49. powder storage container; 50. fixing frame. DETAILED DESCRIPTION

[0026] Embodiment 1

[0027] like Figure 1-Figure 6 As shown, a powder metallurgy gear pressing and forming device proposed in this embodiment includes a pressing and forming and demoulding mechanism, a feeding and pushing mechanism, and a powder conveying and cleaning mechanism.

[0028] like Figure 2 As shown, the press-forming and demoulding mechanism includes a base 1, a forming table 2 arranged on the base 1, a pressing assembly arranged on the forming table 2 and a demoulding assembly arranged on the base 1, the forming table 2 has a forming groove 201, and the outer peripheral surface of the forming groove 201 is a tooth-shaped profile. Specifically, the forming groove 201 has a cylindrical portion in the middle and a tooth-shaped outer periphery, which is used for press-forming of gear workpieces.

[0029] like Figure 2As shown, the pressing assembly includes a guide rod 3 vertically arranged on the forming table 2, a top seat 4 arranged on the guide rod 3, a lifting platform 5 slidably arranged on the guide rod 3, a first hydraulic cylinder 8 arranged on the top seat 4 and driving the lifting platform 5 to rise and fall, a connecting cylinder 7 arranged at the bottom of the lifting platform 5, and a toothed upper die 6 arranged at the bottom of the connecting cylinder 7, the toothed upper die 6 is adapted to the forming groove 201, and the toothed upper die 6 has a through hole for the cylindrical part in the middle of the forming groove 201 to pass through. After the feeding and pushing mechanism replenishes powder into the forming groove 201, the first hydraulic cylinder 8 drives the lifting platform 5 to move downward, and the lifting platform 5 drives the connecting cylinder 7 and the toothed upper die 6 to move downward, and the toothed upper die 6 presses the powder in the forming groove 201 downward to obtain a gear workpiece. Then, the first hydraulic cylinder 8 drives the lifting platform 5 to move upward, and the toothed upper die 6 moves upward and leaves the forming groove 201.

[0030] The demoulding assembly includes a plurality of pusher posts 9 vertically penetrating and slidingly arranged on the forming table 2, a lifting plate 10 arranged at the bottom of the pusher posts 9, and a second hydraulic cylinder 11 arranged on the base 1 and driving the lifting plate 10 to rise and fall. The bottom of the groove of the forming table 2 has a groove and a slideway. The pusher posts 9 include a pusher part and a slide column part connected in one piece. The pusher part is located above the slide column part, and the cross-sectional dimension of the pusher part is larger than the cross-sectional dimension of the slide column part. The pusher part is adapted to the groove, and the slide column part is slidably arranged at the slideway. When the gear workpiece is pressed, the pusher part is located in the groove, and the top surface of the pusher part is flush with the bottom of the forming groove 201. After the gear workpiece is pressed and formed and the toothed upper mold 6 moves up and disengages, the second hydraulic cylinder 11 drives the lifting plate 10 to move up, and the lifting plate 10 drives the plurality of pusher posts 9 to move up. The pusher posts 9 push the gear workpiece up, and the lower surface of the gear workpiece is flush with the top surface of the forming table 2, so that the feeding and pushing mechanism can push the gear workpiece outward.

[0031] like Figure 1-Figure 3 As shown, the feeding and pushing mechanism includes a feeding component and a pushing component connected to the feeding component and capable of moving laterally. The feeding component can add powder raw materials supplied from the outside into the forming groove 201 for pressing and forming powder metallurgy gears.

[0032] The feeding assembly includes a bracket 18 arranged on the top seat 4, a feeding pipe 19 arranged on the bracket 18 and having a flat bottom end, a material box 15 slidably arranged on the upper surface of the forming table 2, a blocking plate 14 connected to the outer end of the material box 15, a connecting plate 13 connected to the blocking plate 14, and a third hydraulic cylinder 12 arranged on the forming table 2 and driving the connecting plate 13 to move horizontally. The material box 15 has a discharge port at the bottom and a feed port at the top that can be connected to the bottom end of the feeding pipe 19. The top surface of the blocking plate 14 is flush with the top surface of the material box 15. In the process of the toothed upper die 6 pressing the powder in the forming groove 201 and the pushing column 9 pushing the gear workpiece up to the bottom surface flush with the top surface of the forming table 2, the feed port of the material box 15 remains connected to the feeding pipe 19, and the external powder source continuously transports the powder raw material into the material box 15 through the feeding pipe 19. When the processed gear workpiece needs to be pushed out, the third hydraulic cylinder 12 contracts, and drives the material box 15 to move toward the forming groove 201 through the connecting plate 13 and the sealing plate 14. The feed port of the material box 15 is disconnected from the feeding pipe 19, and the sealing plate 14 is sealed at the bottom of the feeding pipe 19, thereby stopping the powder transportation in the feeding pipe 19.

[0033] In addition, a support plate 20 is provided on the side of the forming table 2, and a roller 21 is rotatably provided at the bottom of the blocking plate 14. The roller 21 rolls on the support plate 20 and the forming table 2, so that the blocking plate 14 can move smoothly in the horizontal direction, thereby driving the material box 15 to move smoothly.

[0034] like Figure 1-Figure 3 As shown, the pusher assembly includes a connecting frame 16 arranged on the material box 15 and a pusher plate 17 arranged on the connecting frame 16. The pusher plate 17 is a U-shaped plate, and the U-shaped opening faces one side in the horizontal direction. The bottom end of the pusher plate 17 is flush with the top surface of the forming table 2, and the pusher plate 17 can effectively push the gear workpiece and powder to the right. When the material box 15 moves toward the forming groove 201, the pusher plate 17 is driven to move by the connecting frame 16, and the pusher plate 17 pushes the gear workpiece supported by the pusher column 9 to the right in the horizontal direction to unload the gear workpiece and clean the powder. When the material box 15 moves outward to the extreme position, the material box 15 wraps the forming groove 201 at the lower inner side, and the powder in the material box 15 will fall into the forming groove 201 to achieve the replenishment of the powder raw material. Then, the third hydraulic cylinder 12 extends, and the material box 15 moves in the opposite direction to the position connected with the feeding pipe 19 to continue to receive the powder raw material. During the movement, the material box 15 drags back the excess powder protruding from the top of the forming groove 201, and this part of the powder remains on the inner side of the material box 15. The material box 15 not only plays the role of replenishing powder raw materials to the forming groove 201, but also can drag back the excess powder to achieve quantitative replenishment.

[0035] The powder conveying and cleaning mechanism includes a conveyor belt assembly, a toggle assembly, a powder extraction assembly, a powder collection assembly, and a linkage assembly that links the pusher assembly and the powder extraction assembly. The conveyor belt assembly is arranged on a lateral side of the forming table 2. The toggle assembly is connected to the conveyor belt assembly in a transmission manner. When the conveyor belt assembly is in operation, the toggle assembly toggles the conveyor belt assembly to knock off the powder attached to the gear workpiece. When the pusher assembly pushes the gear workpiece on the forming table 2 onto the conveyor belt assembly, the feeding assembly replenishes powder into the forming groove 201. The pusher assembly triggers the powder extraction assembly to operate through the linkage assembly and triggers the conveyor belt assembly to operate. The toggle assembly toggles the conveyor belt assembly. The powder extraction assembly creates negative air pressure at the conveyor belt assembly and extracts the knocked-off powder into the powder collection assembly. When the pusher assembly moves in the reverse direction to reset, the feeding assembly flattens the powder in the molding groove 201 and moves away from the top of the molding groove 201, the conveyor belt assembly does not run, and the powder suction assembly creates negative air pressure at the conveyor belt assembly and pumps the fallen powder into the powder collecting assembly, that is, the running time of the powder suction assembly will be longer than the running time of the conveyor belt assembly and the toggle assembly, and the fallen powder can be more effectively pumped into the powder collecting assembly.

[0036] This embodiment can automatically shake off the powder by bumping and collect the powder when the gear workpiece is pushed out, which is convenient for recycling and avoids the subsequent process of cleaning the gear workpiece separately. When the powder raw material is replenished into the molding groove 201 through the material box 15, quantitative replenishment can be achieved to ensure the uniformity of the specifications of the gear workpiece pressed and formed. At the same time, when the material box 15 replenishes the powder raw material, the gear workpiece and the powder that may remain on the gear workpiece and the molding table 2 can be pushed out at the same time through the push plate 17, and the powder pushed out can be shaken off by the conveying and cleaning powder mechanism, and the powder can be collected for recycling, leaving a clean gear workpiece. A material tray or a material barrel is set at the terminal end of the conveyor belt assembly to receive the clean gear workpiece conveyed by the conveyor belt assembly.

[0037] Embodiment 2

[0038] like Figure 1-Figure 6As shown, a powder metallurgy gear pressing and forming device proposed in this embodiment, compared with the first embodiment, in this embodiment, the conveyor belt assembly includes a mounting frame arranged on the side of the forming table 2, a first mounting shaft 25 and a second mounting shaft 27 arranged on the mounting frame for damping rotation, a first rotating roller 26 arranged on the first mounting shaft 25, a second rotating roller 28 arranged on the second mounting shaft 27, and a conveyor belt 29 sleeved on the first rotating roller 26 and the second rotating roller 28. The mounting frame includes a first side plate 241 and a second side plate 242 arranged side by side. The conveyor belt 29 has uniformly distributed meshes. The toggle assembly includes a first gear 30 arranged on the second mounting shaft 27, a rotating shaft 32 rotatably arranged on the mounting frame, a second gear 31 coaxially arranged on the rotating shaft 32, and a belt-pulling roller 33, the second gear 31 is meshedly connected with the first gear 30, and the belt-pulling roller 33 has a convex plate portion for toggling the inner upper surface of the conveyor belt 29. When one mounting shaft rotates, the operation of the conveyor belt 29 can be realized by driving the corresponding rotating roller to rotate, and the rotation of the other mounting shaft and the rotating roller can be realized at the same time. When the second mounting shaft 27 rotates, it drives the first gear 30 to rotate. The first gear 30 drives the rotating shaft 32 to rotate through the second gear 31. The rotating shaft 32 drives the belt-pulling roller 33 to rotate. The convex plate portion on the belt-pulling roller 33 intermittently pushes the top of the conveyor belt 29 from the inside of the conveyor belt 29 to achieve the bumping of the conveyor belt 29. After the gear workpiece is pushed onto the conveyor belt 29, the bumping of the conveyor belt 29 can knock the powder off, and the knocked powder falls through the mesh holes on the conveyor belt 29.

[0039] like Figure 1 As shown, a connecting plate 22 is provided on the side of the forming table 2, and the top surface of the connecting plate 22 is flush with the top surface of the forming table 2 and connected to one end of the top of the conveyor belt 29. When the push plate 17 pushes the gear workpiece and powder, the connecting plate 22 can effectively push the gear workpiece and powder onto the conveyor belt 29, ensuring the smoothness of the pushing process.

[0040] like Figure 3-Figure 6 As shown, the powder extraction assembly includes a powder guide 48 arranged on a mounting frame, a piston cylinder 42 having two air suction ports on the top and two air outlets on the bottom, a first air suction pipe 44 and a second air suction pipe 46 respectively connected to the two air suction ports, a first air outlet pipe 45 and a second air outlet pipe 47 respectively connected to the two air outlets, and a piston 41 horizontally slidably arranged in the piston cylinder 42. The powder guide 48 includes a bucket-shaped powder receiving hopper 481 and a powder guide tube 482 connected to the bottom of the powder receiving hopper 481. The powder receiving hopper 481 is located on the inner side of the conveyor belt 29. The powder guide tube 482 includes an obliquely distributed oblique tube portion and a vertical tube portion connected to the bottom end of the oblique tube portion. The powder will enter the powder receiving hopper 481 under the action of its own gravity and air negative pressure. After the powder falls into the powder receiving hopper 481, it will continue to slide into the oblique tube portion. The obliquely distributed oblique tube portion is more conducive to the powder being transported to the vertical tube portion in an oblique downward direction.

[0041] like Figure 4 and Figure 5 As shown, the outer ends of the first air extraction pipe 44 and the second air extraction pipe 46 are both connected to the powder guide pipe 482, and filters are provided at the connection points to prevent powder from entering the piston cylinder 42. The first air extraction pipe 44 is provided with a first one-way valve 441 that is unidirectionally connected from the powder guide pipe 482 to the piston cylinder 42, the first air outlet pipe 45 is provided with a second one-way valve 451 that is unidirectionally exhausted from the piston cylinder 42 to the outside, the second air extraction pipe 46 is provided with a third one-way valve 461 that is unidirectionally connected from the powder guide pipe 482 to the piston cylinder 42, and the second air outlet pipe 47 is provided with a fourth one-way valve 471 that is unidirectionally exhausted from the piston cylinder 42 to the outside. The piston 41 divides the inner space of the piston cylinder 42 into a first cavity on the left and a second cavity on the right.

[0042] When the piston 41 slides to the right, the first one-way valve 441 and the second one-way valve 451 are closed, the third one-way valve 461 and the fourth one-way valve 471 are opened, the second air extraction pipe 46 extracts air from the powder guide tube 482, the air passes through the second air extraction pipe 46 to enter the first cavity in the piston cylinder 42 after the powder is filtered out through the filter, and the piston 41 squeezes out the air in the second cavity through the second air outlet pipe 47. When the piston 41 slides to the left, the third one-way valve 461 and the fourth one-way valve 471 are closed, the first one-way valve 441 and the second one-way valve 451 are opened, the first air extraction pipe 44 extracts air from the powder guide tube 482, the air passes through the first air extraction pipe 44 to enter the second cavity in the piston cylinder 42 after the powder is filtered out through the filter, and the piston 41 squeezes out the air in the first cavity through the first air outlet pipe 45. Therefore, no matter whether the piston 41 moves left or right, the effect of extracting air from the powder guide tube 482 can be achieved, thereby continuously creating negative air pressure at the powder receiving hopper 481 .

[0043] When the air is sucked out through the first air suction pipe 44, the powder on the filter screen at the connection between the second air suction pipe 46 and the powder guide pipe 482 can also be sucked out to prevent the filter screen from being blocked. Similarly, when the air is sucked out through the second air suction pipe 46, the powder on the filter screen at the connection between the first air suction pipe 44 and the powder guide pipe 482 can also be sucked out.

[0044] like Figure 3-Figure 5As shown, the linkage assembly includes a rack 23 horizontally arranged on the connecting frame 16, a mounting ring 34 coaxially arranged on the first mounting shaft 25, a third gear 35 rotatably arranged on the mounting ring 34 and having a ratchet groove on the end surface, a clamping plate 36 rotatably arranged on the mounting ring 34, a spring 37 connected between the clamping plate 36 and the mounting ring 34, a fourth gear 38 rotatably arranged on the mounting frame and meshingly connected with the third gear 35, a connecting rod 39 with one end eccentrically rotatably connected to the fourth gear 38, and a moving rod 40 rotatably connected to the other end of the connecting rod 39. The moving rod 40 is slidably arranged on the piston cylinder 42 and one end of the inner side is connected to the piston 41. When the third gear 35 rotates clockwise, the mounting ring 34 is driven to rotate through the clamping plate 36. When the third gear 35 rotates counterclockwise, the spring 37 is repeatedly compressed through the clamping plate 36.

[0045] When the push plate 17 pushes the gear workpiece and powder to the right, the connecting frame 16 drives the rack 23 to move right, the rack 23 drives the third gear 35 to rotate clockwise, the third gear 35 drives the mounting ring 34 to rotate clockwise through the clamping plate 36, the mounting ring 34 drives the first mounting shaft 25 to rotate clockwise, the first mounting shaft 25 drives the conveyor belt 29 to run clockwise through the first rotating roller 26, and the conveyor belt 29 drives the second mounting shaft 27 to rotate clockwise through the second rotating roller 28. When the push plate 17 moves to the left, the connecting frame 16 drives the rack 23 to move left, and the rack 23 drives the third gear 35 to rotate counterclockwise. The third gear 35 repeatedly squeezes the card plate 36 through the ratchet groove, and the spring 37 is repeatedly compressed, but it will not drive the mounting ring 34 and the first mounting shaft 25 to rotate counterclockwise. The conveyor belt 29 remains stationary, and the belt roller 33 does not move the conveyor belt 29, that is, the one-way transportation of the conveyor belt 29 is realized. Each time the conveyor belt 29 runs, it can transport the gear workpiece to the right for a certain distance, and can transport multiple gear workpieces distributed at intervals at the same time, and can drop multiple gear workpieces from the right end in sequence.

[0046] No matter the rack 23 moves to the left or to the right, the third gear 35 can be driven to rotate, the third gear 35 drives the fourth gear 38 to rotate, the fourth gear 38 drives the moving rod 40 to move back and forth through the connecting rod 39, and the moving rod 40 drives the piston 41 to slide back and forth, thereby alternately extracting the air in the powder guide tube 482 through the first exhaust pipe 44 and the second exhaust pipe 46, and alternately used to create air negative pressure at the powder receiving hopper 481.

[0047] like Figure 3 and Figure 4As shown, the powder collecting assembly includes a fixing frame 50 arranged on the base 1, a powder storage container 49 arranged on the fixing frame 50, and a sealing plug detachably connected to the bottom end of the powder storage container 49. The top end of the powder storage container 49 is connected to the bottom end of the vertical tube portion of the powder guide tube 482. A cylinder frame 43 is arranged on the fixing frame 50, and the piston cylinder 42 is installed on the cylinder frame 43. When collecting powder, the sealing plug is sealed at the bottom end of the powder storage container 49, and the powder is transported from the powder guide tube 482 to the powder storage container 49. When the powder in the powder storage container 49 needs to be cleared, a collection container is arranged below the powder storage container 49, and the sealing plug is opened to collect the powder discharged from the powder storage container 49.

[0048] In this embodiment, the powder on the conveyor belt 29 can be shaken off by the belt roller 33 when the conveyor belt 29 is running, so as to clean the gear workpiece, and the first exhaust pipe 44 and the second exhaust pipe 46 can be alternately used to extract air to create negative air pressure through the reciprocating movement of the piston 41, and the powder can be concentrated in the powder storage container 49 for easy recycling, thereby saving costs.

[0049] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A powder metallurgy gear pressing and forming device, characterized in that: include: A pressing molding and demoulding mechanism comprises a base (1), a molding table (2) arranged on the base (1), a pressing assembly arranged on the molding table (2), and a demoulding assembly arranged on the base (1), wherein the molding table (2) has a molding groove (201), and the outer peripheral surface of the molding groove (201) is a tooth-shaped profile; A feeding and pushing mechanism, which includes a feeding component and a pushing component connected to the feeding component and capable of moving in the transverse direction; The powder conveying and cleaning mechanism comprises a conveyor belt assembly, a toggle assembly, a powder suction assembly, a powder collecting assembly, and a linkage assembly that links the pusher assembly and the powder suction assembly, wherein the conveyor belt assembly is arranged on a lateral side of a molding table (2), and the toggle assembly is in transmission connection with the conveyor belt assembly; when the pusher assembly pushes the gear workpiece on the molding table (2) onto the conveyor belt assembly, the feeding assembly replenishes powder into the molding groove (201), the toggle assembly toggle the conveyor belt assembly, the powder suction assembly creates negative air pressure at the conveyor belt assembly and pumps the powder that has fallen into the powder collecting assembly; when the pusher assembly moves in the reverse direction to reset, the feeding assembly flattens the powder in the molding groove (201) and moves away from above the molding groove (201), and the powder suction assembly creates negative air pressure at the conveyor belt assembly and pumps the powder that has fallen into the powder collecting assembly.

2. A powder metallurgy gear pressing and forming device according to claim 1, characterized in that: The pressing assembly comprises a guide rod (3) vertically arranged on a forming platform (2), a top seat (4) arranged on the guide rod (3), a lifting platform (5) slidably arranged on the guide rod (3), a first hydraulic cylinder (8) arranged on the top seat (4) and driving the lifting platform (5) to move up and down, a connecting tube (7) arranged at the bottom of the lifting platform (5), and a toothed upper die (6) arranged at the bottom of the connecting tube (7), wherein the toothed upper die (6) is adapted to the forming groove (201).

3. A powder metallurgy gear pressing and forming device according to claim 2, characterized in that: The demoulding assembly comprises a plurality of pusher columns (9) vertically penetrating and slidingly arranged on a molding table (2), a lifting plate (10) arranged at the bottom of the pusher columns (9), and a second hydraulic cylinder (11) arranged on the base (1) and driving the lifting plate (10) to move up and down. The bottom of the molding table (2) groove has a groove and a slideway. The pusher column (9) comprises a pusher portion and a slide column portion which are integrally connected. The pusher portion is located above the slide column portion. The cross-sectional dimension of the pusher portion is larger than the cross-sectional dimension of the slide column portion. The pusher portion is adapted to the groove. The slide column portion is slidably arranged on the slideway.

4. The powder metallurgy gear pressing and forming device according to claim 2, characterized in that: The feeding assembly comprises a bracket (18) arranged on a top seat (4), a feeding pipe (19) arranged on the bracket (18) and having a flat bottom end, a material box (15) slidably arranged on the upper surface of a forming table (2), a blocking plate (14) connected to the outer end of the material box (15), a connecting plate (13) connected to the blocking plate (14), and a third hydraulic cylinder (12) arranged on the forming table (2) and driving the connecting plate (13) to move laterally. The material box (15) has a discharge port at the bottom and a feed port at the top that can be connected to the bottom end of the feeding pipe (19). After the feed port of the material box (15) is disconnected from the feeding pipe (19), the blocking plate (14) blocks the bottom end of the feeding pipe (19).

5. The powder metallurgy gear pressing and forming device according to claim 4, characterized in that: A support plate (20) is arranged on the side of the forming table (2), and a roller (21) is rotatably arranged at the bottom of the blocking plate (14), and the roller (21) rolls on the support plate (20) and the forming table (2).

6. The powder metallurgy gear pressing and forming device according to claim 4, characterized in that: The pusher assembly comprises a connecting frame (16) arranged on the material box (15) and a pushing plate (17) arranged on the connecting frame (16); the pushing plate (17) is a U-shaped plate, and the U-shaped opening faces one lateral side.

7. The powder metallurgy gear pressing and forming device according to claim 6, characterized in that: The conveyor belt assembly comprises a mounting frame arranged on the side of a forming table (2), a first mounting shaft (25) and a second mounting shaft (27) arranged on the mounting frame for damping rotation, a first rotating roller (26) arranged on the first mounting shaft (25), a second rotating roller (28) arranged on the second mounting shaft (27), and a conveyor belt (29) sleeved on the first rotating roller (26) and the second rotating roller (28), wherein the conveyor belt (29) has uniformly distributed mesh holes, and a connecting plate (29) is arranged on the side of the forming table (2). 2), the top surface of the connecting plate (22) is flush with the top surface of the forming table (2) and connected to one end of the top of the conveyor belt (29); the toggling assembly comprises a first gear (30) arranged on the second mounting shaft (27), a rotating shaft (32) rotatably arranged on the mounting frame, a second gear (31) coaxially arranged on the rotating shaft (32) and a belt-pulling roller (33), the second gear (31) is meshingly connected with the first gear (30), and the belt-pulling roller (33) has a convex plate portion for toggling the inner upper surface of the conveyor belt (29).

8. The powder metallurgy gear pressing and forming device according to claim 7, characterized in that: The powder extraction assembly comprises a powder guide member (48) arranged on a mounting frame, a piston cylinder (42) having two suction ports at the top and two air outlets at the bottom, a first suction pipe (44) and a second suction pipe (46) respectively connected to the two suction ports, a first air outlet pipe (45) and a second air outlet pipe (47) respectively connected to the two air outlets, and a piston (41) horizontally slidably arranged in the piston cylinder (42), the powder guide member (48) comprising a bucket-shaped powder receiving hopper (481) and a powder guide pipe (482) connected to the bottom of the powder receiving hopper (481), the powder receiving hopper (481) being located on the inner side of the conveyor belt (29), the powder guide pipe (482) comprising an inclined pipe portion and an inclined pipe portion connected to the bottom end of the inclined pipe portion. The first exhaust pipe (44) and the second exhaust pipe (46) are connected to each other, and the outer ends of the first exhaust pipe (44) and the second exhaust pipe (46) are connected to the powder guide pipe (482), and filters are provided at the connection points. The first exhaust pipe (44) is provided with a first one-way valve (441) for one-way conduction from the powder guide pipe (482) to the piston cylinder (42), the first outlet pipe (45) is provided with a second one-way valve (451) for one-way exhaust from the piston cylinder (42) to the outside, the second exhaust pipe (46) is provided with a third one-way valve (461) for one-way conduction from the powder guide pipe (482) to the piston cylinder (42), and the second outlet pipe (47) is provided with a fourth one-way valve (471) for one-way exhaust from the piston cylinder (42) to the outside.

9. The powder metallurgy gear pressing and forming device according to claim 8, characterized in that: The linkage assembly comprises a rack (23) horizontally arranged on a connecting frame (16), a mounting ring (34) coaxially arranged on a first mounting shaft (25), a third gear (35) rotatably arranged on the mounting ring (34) and having a ratchet groove on its end surface, a clamping plate (36) rotatably arranged on the mounting ring (34), a spring (37) connected between the clamping plate (36) and the mounting ring (34), a fourth gear (38) rotatably arranged on the mounting frame and meshingly connected to the third gear (35), a connecting rod (39) one end of which is eccentrically rotatably connected to the fourth gear (38), and a moving rod (40) rotatably connected to the other end of the connecting rod (39), wherein the moving rod (40) is slidably arranged on a piston cylinder (42) and one inner end of which is connected to a piston (41); when the third gear (35) rotates clockwise, the mounting ring (34) is driven to rotate through the clamping plate (36); when the third gear (35) rotates counterclockwise, the spring (37) is repeatedly compressed through the clamping plate (36).

10. The powder metallurgy gear pressing and forming device according to claim 8, characterized in that: The powder collecting assembly comprises a fixing frame (50) arranged on a base (1), a powder storage container (49) arranged on the fixing frame (50), and a sealing plug detachably connected to the bottom end of the powder storage container (49); the top end of the powder storage container (49) is connected to the bottom end of the vertical tube portion of the powder guide tube (482); a cylinder frame (43) is arranged on the fixing frame (50), and the piston cylinder (42) is installed on the cylinder frame (43).

Images