A powder metallurgy gear pressing and forming device

Abstract

The present invention relates to the field of metal powder forming and processing, and specifically to a powder metallurgy gear pressing and forming device. It includes a pressing and demoulding mechanism, a feeding and pushing mechanism, and a conveying and cleaning powder mechanism; the pressing and demoulding mechanism includes a base, a molding table arranged on the base, a pressing assembly arranged on the molding table, and a demoulding assembly arranged on the base, and the molding table has a molding groove; the feeding and pushing mechanism includes a feeding assembly and a pushing assembly connected to the feeding assembly and capable of moving laterally; the conveying and cleaning powder mechanism includes a conveyor belt assembly, a toggle assembly, a powder extraction assembly, a powder collection assembly, and a linkage assembly that links the pushing assembly and the powder extraction assembly, and the conveyor belt assembly is arranged on the lateral side of the molding table, and the toggle assembly is transmission-connected to the conveyor belt assembly. The present invention can automatically shake off the powder and collect the powder by bumping when the gear workpiece is pushed out, so as to facilitate recycling.

Description

Technical Field

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

[0002] Powder metallurgy gears are powder metallurgy parts, which are made through a one-step forming and finishing process, and can fully meet the dimensional accuracy requirements, especially the tooth profile accuracy. The forming and processing speed is fast and the efficiency is high.

[0003] Chinese Patent Publication No. CN209452801U discloses a powder metallurgy gear pressing and forming device, which includes a base, a shock absorption mechanism, a forming mechanism, a pressing mechanism and a filling mechanism. The forming mechanism is provided with a demolding hydraulic cylinder, and a first proximity switch is arranged on the side of the demolding hydraulic cylinder. The base is fixedly connected with a fixed bracket and a 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 arranged above the receiving support frame, a tray is arranged above the weight detector, the tray is provided with a receiving inclined plane, and four sliding rods are arranged below the tray. The sliding rods penetrate through the upper surface of the receiving support frame. An installation base is arranged on one side of the forming mechanism, a pneumatic cylinder is arranged above the installation base, a pushing plate matching with the tray is arranged on one side of the pneumatic cylinder, and a fourth proximity switch and a fifth proximity switch are arranged on the pneumatic cylinder. Two square grooves are symmetrically arranged on the side surface of the forming mechanism, and the square grooves are connected with a receiving structure.

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

[0005] For the formed gear workpiece, when the gear workpiece is pushed into the tray, the powder will be pushed out together with the gear workpiece. Subsequently, the gear workpiece needs to go through a powder cleaning processing procedure, which is rather troublesome. Summary of the Invention

[0006] The object of the present invention is to address the problems in the background art and propose a powder metallurgy gear pressing and forming device, which can automatically shake off the powder in a bumpy manner and collect the powder when the gear workpiece is pushed out, facilitating 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 fixing frame arranged on the base, a powder storage container arranged on the fixing frame, and a sealing plug detachably connected to the bottom end of the powder storage container. The top end of the powder storage container communicates with the bottom end of the vertical pipe portion of the powder guiding pipe. A cylinder frame is arranged on the fixing frame, and the piston cylinder is installed on the cylinder frame.

[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 in a bumpy manner and collect the powder when pushing out the gear workpiece, which is convenient for recycling and avoids the subsequent process of separately cleaning the gear workpiece. When replenishing the powder raw material into the forming groove through the material box, quantitative replenishment can be achieved to ensure the specification uniformity of the gear workpiece during pressing and forming. At the same time, the gear workpiece and the powder that may remain on the forming table are pushed out by the pushing plate, and the powder pushed out is shaken off by the conveying and powder cleaning mechanism to collect the powder for recycling. Description of the Drawings

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

[0020] Figure 2 is a partial structural sectional view of pressing the gear workpiece in an embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of pushing the gear workpiece onto the conveyor belt and replenishing the powder into the forming groove;

[0022] Figure 4 is a partial structural sectional view of shaking off and sucking the powder in an embodiment of the present invention;

[0023] Figure 5 is Figure 4 an enlarged view of the structure at A in

[0024] Figure 6 is a schematic structural diagram of the powder guiding member.

[0025] Reference numerals: 1, base; 2, forming table; 201, forming groove; 3, guide rod; 4, top seat; 5, lifting table; 6, toothed upper die; 7, connecting cylinder; 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, support; 19, feeding pipe; 20, support 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-pushing 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 frame; 44, first air suction pipe; 441, first one-way valve; 45, first air outlet pipe; 451, second one-way valve; 46, second air suction pipe; 461, third one-way valve; 47, second air outlet pipe; 471, fourth one-way valve; 48, powder guiding member; 481, powder receiving hopper; 482, powder guiding pipe; 49, powder storage container; 50, fixing frame. Detailed implementation manners

[0026] Embodiment 1

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

[0028] As Figure 2 shown, the pressing and forming and demolding 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 demolding 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 toothed profile. Specifically, the middle of the forming groove 201 has a cylindrical portion, and the periphery is toothed, which is used for the pressing and forming of gear workpieces.

[0029] As Figure 2As shown in the figure, 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 table 5 slidably arranged on the guide rod 3, a first hydraulic cylinder 8 arranged on the top seat 4 and driving the lifting table 5 to lift and lower, a connecting cylinder 7 arranged at the bottom of the lifting table 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 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 the powder into the forming groove 201, the first hydraulic cylinder 8 drives the lifting table 5 to move downward. The lifting table 5 drives the connecting cylinder 7 and the toothed upper die 6 to move downward, and the toothed upper die 6 presses down the powder in the forming groove 201 to obtain a gear workpiece by pressing. Then, the first hydraulic cylinder 8 drives the lifting table 5 to move upward, and the toothed upper die 6 moves upward and disengages from the forming groove 201.

[0030] The demolding assembly includes a plurality of push rods 9 vertically penetrating and slidably arranged on the forming table 2, a lifting plate 10 arranged at the bottom of the push rods 9, and a second hydraulic cylinder 11 arranged on the base 1 and driving the lifting plate 10 to lift and lower. The bottom of the forming table 2 has a groove and a slideway. The push rod 9 includes a push table part and a slide column part integrally connected. The push table part is located above the slide column part, and the cross-sectional dimension of the push table part is larger than that of the slide column part. The push table part is adapted to the groove, and the slide column part is slidably arranged at the slideway. When pressing the gear workpiece, the push table part is located in the groove, and the top surface of the push table part is flush with the bottom of the forming groove 201. After the gear workpiece is pressed and formed and the toothed upper die 6 moves upward and disengages, the second hydraulic cylinder 11 drives the lifting plate 10 to move upward. The lifting plate 10 drives the plurality of push rods 9 to move upward, and the push rods 9 push the gear workpiece upward so that the lower surface of the gear workpiece is flush with the top surface of the forming table 2 for the feeding and pushing mechanism to push the gear workpiece outwards.

[0031] As Figures 1-3 shown, the feeding and pushing mechanism includes a feeding assembly and a pushing assembly connected to the feeding assembly and capable of moving horizontally. The feeding assembly can add the powder raw material supplied from the outside to the forming groove 201 for the powder metallurgy gear to be pressed and formed.

[0032] The feeding assembly includes a bracket 18 provided on the top seat 4, a feeding pipe 19 provided on the bracket 18 and having a flat bottom end, a material box 15 slidably provided on the upper surface of the forming table 2, a sealing plate 14 connected to the outer end of the material box 15, a connecting plate 13 connected to the sealing plate 14, and a third hydraulic cylinder 12 provided on the forming table 2 and driving the connecting plate 13 to move horizontally. The bottom of the material box 15 has a discharge port and the top has a feed port capable of communicating with the bottom end of the feeding pipe 19. The top surface of the sealing plate 14 is flush with the top surface of the material box 15. During the process that the powder in the forming groove 201 is pressed by the toothed upper die 6 and the pushing column 9 pushes the gear workpiece upward until the bottom surface is flush with the top surface of the forming table 2, the feed port of the material box 15 remains in communication with the feeding pipe 19, and the external powder source continuously conveys powder raw materials into the material box 15 through the feeding pipe 19. When it is necessary to push out the processed gear workpiece, the third hydraulic cylinder 12 contracts, drives the material box 15 to move towards the forming groove 201 through the connecting plate 13 and the sealing plate 14, the feed port of the material box 15 is disengaged from the feeding pipe 19, and the sealing plate 14 seals the bottom end of the feeding pipe 19, aborting the powder delivery 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 sealing plate 14. The roller 21 rolls on the support plate 20 and the forming table 2, enabling the sealing plate 14 to move smoothly horizontally, thereby driving the material box 15 to move smoothly.

[0034] As Figures 1-3 shown, the pushing component includes a connecting frame 16 provided on the material box 15 and a pushing plate 17 provided on the connecting frame 16. The pushing plate 17 is a U-shaped plate, and the U-shaped opening faces the horizontal side. The bottom end of the pushing plate 17 is flush with the top surface of the forming table 2, and the pushing plate 17 can effectively push the gear workpiece and the powder to the right. When the material box 15 moves towards the forming groove 201, the pushing plate 17 is driven to move through the connecting frame 16, and the pushing plate 17 pushes the gear workpiece supported by the pushing column 9 horizontally to the right to unload and clean the powder of the gear workpiece. When the material box 15 moves outwards to the limit position, the material box 15 encloses the forming groove 201 inside and below, and the powder in the material box 15 will fall into the forming groove 201 to achieve the replenishment of the powder raw materials. Then, the third hydraulic cylinder 12 extends, and the material box 15 moves in the reverse direction to a position in communication with the feeding pipe 19 to continue receiving the powder raw materials. The material box 15 drags back the excess powder protruding from the top of the forming groove 201 during the movement process, and this part of the powder still remains inside the material box 15. The material box 15 not only plays a role in replenishing the powder raw materials for 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 Figures 1-6As 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 Figures 3-6 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] likeFigure 4 and Figure 5 As shown in Figure 5 , both the outer ends of the first air extraction pipe 44 and the second air extraction pipe 46 are communicated with the powder guiding pipe 482, and filters are provided at the communication positions to prevent powder from entering the piston cylinder 42. A first one-way valve 441 that conducts unidirectionally from the powder guiding pipe 482 to the piston cylinder 42 is provided on the first air extraction pipe 44, a second one-way valve 451 that exhausts air unidirectionally from the piston cylinder 42 to the outside is provided on the first air outlet pipe 45, a third one-way valve 461 that conducts unidirectionally from the powder guiding pipe 482 to the piston cylinder 42 is provided on the second air extraction pipe 46, and a fourth one-way valve 471 that exhausts air unidirectionally from the piston cylinder 42 to the outside is provided on the second air outlet pipe 47. The piston 41 divides the inner space of the piston cylinder 42 into a first cavity on the left side and a second cavity on the right side.

[0042] When the piston 41 slides to the right, the first one-way valve 441 and the second one-way valve 451 are closed, and 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 guiding pipe 482. After the air is filtered by the filter to remove the powder, it enters the first cavity in the piston cylinder 42 through the second air extraction pipe 46. The piston 41 extrudes 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, and 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 guiding pipe 482. After the air is filtered by the filter to remove the powder, it enters the second cavity in the piston cylinder 42 through the first air extraction pipe 44. The piston 41 extrudes the air in the first cavity through the first air outlet pipe 45. Therefore, no matter whether the piston 41 moves to the left or to the right, the effect of extracting air from the powder guiding pipe 482 can be achieved, so as to continuously create a negative air pressure at the powder receiving hopper 481.

[0043] When extracting air through the first air extraction pipe 44, the powder on the filter at the communication position between the second air extraction pipe 46 and the powder guiding pipe 482 can also be sucked off to prevent the filter from being blocked. Similarly, when extracting air through the second air extraction pipe 46, the powder on the filter at the communication position between the first air extraction pipe 44 and the powder guiding pipe 482 can also be sucked off.

[0044] As Figures 3-5As shown in the figure, 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 its end face, 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 meshed with the third gear 35, a connecting rod 39 eccentrically and rotatably connected to one end of the fourth gear 38, and a moving rod 40 rotatably connected to the other end of the connecting rod 39. The moving rod 40 passes through and is slidably arranged on the piston cylinder 42 and its inner end is connected to the piston 41. When the third gear 35 rotates clockwise, it drives the mounting ring 34 to rotate through the clamping plate 36. When the third gear 35 rotates counterclockwise, it repeatedly compresses the spring 37 through the clamping plate 36.

[0045] When the pushing plate 17 pushes the gear workpiece and the powder to the right, the connecting frame 16 drives the rack 23 to move rightward. 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. The conveyor belt 29 drives the second mounting shaft 27 to rotate clockwise through the second rotating roller 28. When the pushing plate 17 moves leftward, the connecting frame 16 drives the rack 23 to move leftward. The rack 23 drives the third gear 35 to rotate counterclockwise. The third gear 35 repeatedly presses the clamping plate 36 through the ratchet groove, and the spring 37 is repeatedly compressed, but it does 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 conveying of the conveyor belt 29 is realized. Each time the conveyor belt 29 runs, it can convey the gear workpiece to the right by a certain distance, can convey multiple gear workpieces distributed at intervals simultaneously, and can successively drop multiple gear workpieces from the right end.

[0046] Regardless of whether the rack 23 moves leftward or rightward, it can drive the third gear 35 to rotate. The third gear 35 drives the fourth gear 38 to rotate. The fourth gear 38 drives the moving rod 40 to reciprocate through the connecting rod 39. The moving rod 40 drives the piston 41 to reciprocate, so as to alternately extract the air in the powder guide pipe 482 through the first air extraction pipe 44 and the second air extraction pipe 46, and alternately create a negative air pressure at the powder receiving hopper 481.

[0047] As 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, comprising a base (1), a molding table (2) arranged on the base (1), a pressing component arranged on the molding table (2), and a demoulding component 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 pumping assembly, a powder collecting assembly, and a linkage assembly that links the pusher assembly and the powder pumping assembly, wherein the conveyor belt assembly is arranged on a lateral side of the molding table (2), and the toggle assembly is in driving 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 pumping 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 pumping assembly creates negative air pressure at the conveyor belt assembly and pumps the powder that has fallen into the powder collecting assembly; 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 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), wherein the toothed upper die (6) is adapted to the forming groove (201); 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) 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. The feeding assembly comprises 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). 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).

2. A powder metallurgy gear pressing and forming device according to claim 1, characterized in that: A support plate (20) is arranged on the side of the forming table (2), and a roller (21) is rotatably arranged on the bottom of the blocking plate (14), and the roller (21) rolls on the support plate (20) and the forming table (2).

3. The powder metallurgy gear pressing and forming device according to claim 1, characterized in that: The pusher assembly comprises a connecting frame (16) arranged on the material box (15) and a material pushing plate (17) arranged on the connecting frame (16); the material pushing plate (17) is a U-shaped plate, and the U-shaped opening faces one lateral side.

4. A powder metallurgy gear pressing and forming device according to claim 3, characterized in that: The conveyor belt assembly comprises 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), wherein the conveyor belt (29) has evenly 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 the top end 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 on the inner upper surface of the conveyor belt (29) for toggling.

5. The powder metallurgy gear pressing and forming device according to claim 4, characterized in that: The powder extraction assembly comprises a powder guide member (48) arranged on a mounting frame, a piston cylinder (42) having two air suction ports at the top and two air outlets at 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 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), and 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 air extraction pipe (44) and the second air extraction pipe (46) are connected to each other, and 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. The first air extraction 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 air 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 air extraction 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 air outlet pipe (47) is provided with a fourth one-way valve (471) for one-way exhaust from the piston cylinder (42) to the outside.

6. The powder metallurgy gear pressing and forming device according to claim 5, 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), the moving rod (40) penetrating and slidably arranged on a piston cylinder (42) and having an inner end connected to a piston (41), the third gear (35) drives the mounting ring (34) to rotate through the clamping plate (36) when rotating clockwise, and repeatedly compresses the spring (37) through the clamping plate (36) when rotating counterclockwise.

7. The powder metallurgy gear pressing and forming device according to claim 5, 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 mounted on the cylinder frame (43).

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