A powder metallurgy dehumidification device

Abstract

The present invention relates to the technical field of vacuum drying equipment, and specifically to a powder metallurgy dehumidification device, including a frame, a vacuum drying cylinder, a heating component, an exhaust component and a driving component. The vacuum drying cylinder is rotatably arranged on the frame, and the axis of the vacuum drying cylinder extends horizontally in the left and right directions. The interior of the vacuum drying cylinder is sequentially separated from left to right into a left drying chamber, a vacuum exhaust chamber and a right drying chamber, and the vacuum exhaust chamber can be alternately connected with the left drying chamber and the right drying chamber. The present invention sets a left drying chamber, a vacuum exhaust chamber and a right drying chamber inside the vacuum drying cylinder. By making the vacuum exhaust chamber alternately connected with the left drying chamber and the right drying chamber, the metal powder can first absorb heat in an environment with relatively high air pressure, and then be dried in an environment with relatively low air pressure, so as to accelerate the vaporization of liquid water molecules in the metal powder, thereby achieving the purpose of improving the drying efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum drying equipment, in particular to a powder metallurgy dehumidification device. Background Art

[0002] In the powder metallurgy process, dehumidification of metal powder is a very important step, which can effectively prevent metal powder oxidation, improve the fluidity of metal powder, improve compaction, and prevent metal powder from agglomerating, which is of vital importance to improving the performance and reliability of the final product.

[0003] The equipment that can be used to dehumidify metal powder in the prior art includes but is not limited to dryer dehumidifiers, hot air dryers, vacuum dryers and freeze dryers, among which vacuum dryers are the most widely used drying equipment. Vacuum dryers can effectively avoid the influence of high temperature on powder performance and are suitable for powders with strict humidity requirements, such as high-purity metal powders. When the vacuum dryer is in use, the material is usually added into the vacuum drying cylinder first, and then the material in the vacuum drying cylinder is heated while the inside of the vacuum drying cylinder is evacuated. After the vacuum degree in the vacuum drying cylinder reaches a certain value, the temperature and vacuum degree in the vacuum drying cylinder are kept balanced until the material in the vacuum drying cylinder reaches the required degree of dryness, and then the material is discharged. However, since the vacuum degree is inversely proportional to the heat transfer efficiency, although the reduction of the vacuum degree can reduce the boiling point of water, so that the liquid water molecules in the metal powder absorb less heat and can be vaporized into water molecules at air pressure, the heat transfer efficiency is reduced due to the low vacuum degree in the environment, which will hinder the improvement of the drying efficiency of the vacuum dryer. Summary of the invention

[0004] Based on this, it is necessary to provide a powder metallurgy dehumidification device to solve the problem of low drying efficiency of the existing vacuum dryer in view of the problems existing in the current vacuum dryer.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A powder metallurgy dehumidification device comprises:

[0007] frame;

[0008] A vacuum drying cylinder is rotatably mounted on a frame, the axis of which extends horizontally in the left-right direction, and the interior of the vacuum drying cylinder is sequentially separated from left to right into a left drying chamber, a vacuum exhaust chamber, and a right drying chamber, and the vacuum exhaust chamber can be alternately connected to the left drying chamber and the right drying chamber;

[0009] A heating component is arranged outside the vacuum drying cylinder and is used to heat the vacuum drying cylinder;

[0010] The vacuum pumping assembly is arranged outside the vacuum drying cylinder, and the input end of the vacuum pumping assembly is connected to the vacuum pumping chamber, and is used to evacuate the vacuum pumping chamber;

[0011] A driving assembly, the driving assembly is used to drive the vacuum drying cylinder to rotate circumferentially around its axis; a first isolation ring and a second isolation ring are arranged on the inner circumferential wall of the vacuum drying cylinder from left to right, the left drying chamber is the chamber on the left side of the first isolation ring, the right drying chamber is the chamber on the right side of the second isolation ring, and the vacuum exhaust chamber is the chamber between the first isolation ring and the second isolation ring;

[0012] A first piston cylinder is coaxially arranged at one end of the first isolating ring, the first piston cylinder penetrates the first isolating ring and extends into the left drying chamber, and a second piston cylinder is coaxially arranged at one end of the second isolating ring, the second piston cylinder penetrates the second isolating ring and extends into the right drying chamber;

[0013] The first piston cylinder and the second piston cylinder have the same diameter, and a plurality of communication holes are formed on the outer peripheral walls of the first piston cylinder and the second piston cylinder;

[0014] A sliding assembly is provided in the vacuum pumping chamber, and the sliding assembly can alternately block the left drying chamber and the right drying chamber, so that the vacuum pumping chamber is alternately connected with the left drying chamber and the right drying chamber; the sliding assembly includes a plunger, two hinged rods and two support rods, the two support rods are arranged in the vacuum drying cylinder at equal intervals in the circumferential direction, and the ends of the two support rods close to each other are provided with sliding waist grooves, one end of the two hinged rods is slidably connected in the sliding waist grooves on the corresponding side, and the other ends of the two hinged rods are hinged on the outer peripheral wall of the plunger, the plunger is coaxial with the vacuum drying cylinder, and the diameter of the plunger is adapted to the cylinder diameters of the first piston cylinder and the second piston cylinder;

[0015] The plunger has a left limit position and a right limit position;

[0016] When in the left limit position, the plunger blocks the first piston cylinder, and the vacuum pumping chamber and the right drying chamber are connected through the connecting hole;

[0017] When it is in the right extreme position, the plunger blocks the second piston cylinder, and the vacuum pumping chamber and the left drying chamber are connected through the connecting hole.

[0018] In one embodiment, a recoil hole is provided at the center of the plunger, and the recoil hole penetrates the plunger along the axis of the plunger;

[0019] A valve is provided in the recoil hole, and the valve can be rotated to open or close the recoil hole;

[0020] The plunger also has a middle position. When in the middle position, the plunger blocks the first piston cylinder and the second piston cylinder at the same time and causes the valve to rotate so that the recoil hole is opened.

[0021] In one embodiment, the valve is a plug valve, which can rotate around its rotation center. The plug valve has four interfaces, which are interconnected and arranged in a cross shape. Two adjacent interfaces are each provided with a one-way valve, which limits the flow of fluid out of the interface.

[0022] In one embodiment, a driving source is also provided outside the plunger, and the driving source is used to drive the stopcock to rotate;

[0023] A photoelectric sensor is provided in the vacuum pumping chamber, and a reflective plate is provided at the middle position outside the plunger;

[0024] When the plunger moves to the position where the reflector corresponds to the photoelectric sensor, the signal emitted by the photoelectric sensor is reflected by the reflector and received by the photoelectric sensor itself. After receiving the reflected signal, the photoelectric sensor sends an electrical signal to the driving source, and the driving source drives the plug valve to rotate ninety degrees.

[0025] In one embodiment, the heating assembly includes a hot fluid pipeline and a heat pump. The heat pump is arranged on a frame, and the output end of the heat pump is connected to the hot fluid pipeline. A guide interlayer is provided in the vacuum drying cylinder. The end of the hot fluid pipeline away from the heat pump is rotatably connected to the vacuum drying cylinder and connected to the guide interlayer.

[0026] In one embodiment, the vacuum pump assembly includes a vacuum pump and a vacuum pump pipe. The vacuum pump is arranged on a frame, an input end of the vacuum pump is connected to one end of the vacuum pump pipe, and the other end of the vacuum pump pipe is connected to the vacuum pump chamber.

[0027] In one embodiment, the driving assembly includes a motor, a driving pulley, a driven pulley and a center shaft. The motor is arranged on a frame, the center shaft is coaxially arranged at one end of the vacuum drying cylinder, the driven pulley is coaxially arranged at one end of the center shaft, the driving pulley is coaxially arranged on the output shaft of the motor, and the driving pulley is connected to the driven pulley by a belt.

[0028] In one of the embodiments, two inlet / outlet ports are disposed outside the vacuum drying cylinder, and the two inlet / outlet ports are respectively connected to the left drying chamber and the right drying chamber.

[0029] The beneficial effects of the present invention are:

[0030] The present invention arranges a left drying chamber, a vacuum exhaust chamber and a right drying chamber inside the vacuum drying cylinder. By making the vacuum exhaust chamber alternately connected with the left drying chamber and the right drying chamber, the metal powder can first absorb heat in an environment with relatively high air pressure, and then be dried in an environment with relatively low air pressure, so as to accelerate the vaporization of liquid water molecules in the metal powder, thereby achieving the purpose of improving the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an overall schematic diagram of a powder metallurgy dehumidification device of the present invention;

[0032] Figure 2 A half-section axonometric diagram of a powder metallurgy dehumidification device of the present invention;

[0033] Figure 3 It is a front view of a powder metallurgy dehumidification device of the present invention;

[0034] Figure 4 for Figure 3 Middle AA section view;

[0035] Figure 5 It is a schematic diagram of the right limit position of the plunger in a powder metallurgy dehumidification device of the present invention;

[0036] Figure 6 for Figure 4 Schematic diagram of the enlarged structure at B in the middle;

[0037] Figure 7 for Figure 5 Schematic diagram of the enlarged structure at C in the middle;

[0038] Figure 8 This is a schematic diagram of the working principle of a photoelectric sensor in a powder metallurgy dehumidification device of the present invention.

[0039] in:

[0040] 100, rack; 200, vacuum drying cylinder; 201, diversion interlayer; 210, left drying chamber; 220, vacuum exhaust chamber; 230, right drying chamber; 240, first isolation ring; 250, second isolation ring; 260, first piston cylinder; 270, second piston cylinder; 280, connecting hole; 290, inlet / outlet; 300, heating component; 310, hot fluid pipeline; 320, heat pump; 400, exhaust Gas assembly; 410, vacuum pump; 420, vacuum exhaust pipe; 500, driving assembly; 510, motor; 520, driving pulley; 530, driven pulley; 540, center shaft; 600, sliding assembly; 610, plunger; 611, recoil hole; 612, valve; 613, one-way valve; 620, hinged rod; 630, support rod; 631, sliding waist groove; 710, photoelectric sensor; 720, reflector. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] like Figure 1-Figure 8 As shown, a powder metallurgy dehumidification device includes a frame 100, a vacuum drying cylinder 200, a heating component 300, an exhaust component 400 and a driving component 500. The vacuum drying cylinder 200 is rotatably arranged on the frame 100. The axis of the vacuum drying cylinder 200 extends horizontally in the left and right directions. The interior of the vacuum drying cylinder 200 is sequentially separated from left to right into a left drying chamber 210, a vacuum exhaust chamber 220 and a right drying chamber 230. The vacuum exhaust chamber 220 can be alternately connected with the left drying chamber 210 and the right drying chamber 230. The right drying chamber 230 or the left drying chamber 210 that is not connected to the vacuum pumping chamber 220 is in a closed state. The heating component 300 is arranged outside the vacuum drying cylinder 200. The heating component 300 is used to heat the vacuum drying cylinder 200. The exhaust component 400 is arranged outside the vacuum drying cylinder 200, and the input end of the exhaust component 400 is connected to the vacuum pumping chamber 220, which is used to evacuate the vacuum pumping chamber 220. The driving component 500 is used to drive the vacuum drying cylinder 200 to rotate circumferentially around its axis.

[0045] When in use, the staff first divides the metal powder to be dehumidified and dried (hereinafter referred to as material) into two parts, and then adds the two parts of material into the left drying chamber 210 and the right drying chamber 230 respectively, and then starts the heating component 300, the exhaust component 400 and the driving component 500. Under the action of the heating component 300, the temperature of the vacuum drying cylinder 200 rises. Under the action of heat transfer, the materials in the left drying chamber 210 and the right drying chamber 230 gradually absorb heat and heat up. At the same time, the driving component 500 drives the vacuum drying cylinder 200 to rotate around its axis so that the materials in the left drying chamber 210 and the right drying chamber 230 can be heated evenly. At the same time, the exhaust component 400 excites the vacuum exhaust chamber 220. The vacuum pumping reduces the air pressure in the vacuum pumping chamber 220. Since the vacuum pumping chamber 220 can be alternately connected with the left drying chamber 210 and the right drying chamber 230, when the vacuum pumping chamber 220 is connected with the left drying chamber 210, the air pressure in the left drying chamber 210 is reduced, the vacuum degree is gradually increased, and the boiling point of water molecules is reduced. At the same time, the right drying chamber 230 is not connected with the vacuum pumping chamber 220. At this time, as the heating component 300 continues to heat the vacuum drying cylinder 200, the air in the right drying chamber 230 expands and the air pressure increases. At this time, the heat transfer efficiency in the right drying chamber 230 is higher, and the material in the right drying chamber 230 can absorb more heat per unit time.

[0046] When the vacuum pumping chamber 220 is switched to be connected with the right drying chamber 230, similarly, the air pressure in the right drying chamber 230 decreases, the vacuum degree increases, and the boiling point of water molecules decreases. Since the material in the right drying chamber 230 has absorbed more heat before, compared with the case where the material is heated while being depressurized in a drying chamber, the amount of liquid water molecules in the material in the right drying chamber 230 vaporized into gaseous water molecules increases at this time, and then the gaseous water molecules are drawn into the vacuum pumping chamber 220 along with the air and discharged to the outside. At the same time, the left drying chamber 210 is in a closed state, and the air inside the left drying chamber 210 expands, so that the material in the left drying chamber 210 can be more heated per unit time. Heat, when the left drying chamber 210 is switched to be connected with the vacuum pumping chamber 220 again, similarly, since the material in the left drying chamber 210 has absorbed more heat before, the amount of liquid water molecules in the material in the left drying chamber 210 vaporized into gaseous water molecules increases. At this time, the gaseous water molecules are drawn into the vacuum pumping chamber 220 with the air and discharged to the outside. In summary, by making the vacuum pumping chamber 220 alternately connected with the left drying chamber 210 and the right drying chamber 230, the material can first absorb heat in an environment with relatively high air pressure, and then be dried in an environment with relatively low air pressure, so as to accelerate the vaporization of liquid water molecules in the material, thereby achieving the purpose of improving the drying efficiency.

[0047] In a further embodiment, Figure 2 , Figure 4 and Figure 5 As shown, a first isolating ring 240 and a second isolating ring 250 are arranged on the inner peripheral wall of the vacuum drying cylinder 200 from left to right, the left drying chamber 210 is the chamber on the left side of the first isolating ring 240, the right drying chamber 230 is the chamber on the right side of the second isolating ring 250, the vacuum exhaust chamber 220 is the chamber between the first isolating ring 240 and the second isolating ring 250, one end of the first isolating ring 240 is coaxially provided with a first piston cylinder 260, the first piston cylinder 260 passes through the first isolating ring 240 and extends into the left drying chamber 210, and one end of the second isolating ring 250 is coaxially provided with a first piston cylinder 260. The shaft is provided with a second piston cylinder 270, which passes through the second isolation ring 250 and extends into the right drying chamber 230. The first piston cylinder 260 and the second piston cylinder 270 have the same cylinder diameter. The outer peripheral walls of the first piston cylinder 260 and the second piston cylinder 270 are both provided with a plurality of connecting holes 280. A sliding assembly 600 is provided in the vacuum chamber 220, and the sliding assembly 600 can alternately block the left drying chamber 210 and the right drying chamber 230 so that the vacuum chamber 220 is alternately connected with the left drying chamber 210 and the right drying chamber 230.

[0048] When the sliding assembly 600 slides to block the second piston cylinder 270, the left drying chamber 210 is connected to the vacuum pumping chamber 220 through the connecting hole 280. Under the action of the pumping assembly 400, the gaseous water molecules and air in the left drying chamber 210 are quickly pumped out through the vacuum pumping chamber 220, thereby reducing the air pressure in the left drying chamber 210 while improving the degree of dryness of the material. When the sliding assembly 600 slides to block the first piston cylinder 260, the right drying chamber 230 is connected to the vacuum pumping chamber 220 through the connecting hole 280. Under the action of the pumping assembly 400, the gaseous water molecules and air in the right drying chamber 230 are pumped out through the vacuum pumping chamber 220, thereby reducing the air pressure in the right drying chamber 230 while improving the degree of dryness of the material.

[0049] In a further embodiment, Figure 6 and Figure 7As shown, the sliding assembly 600 includes a plunger 610, two hinged rods 620 and two support rods 630. The two support rods 630 are arranged in the vacuum drying cylinder 200 at equal intervals in the circumferential direction. The two support rods 630 are provided with sliding waist grooves 631 at the ends close to each other. One end of the two hinged rods 620 is slidably connected in the sliding waist grooves 631 on the corresponding side. The other ends of the two hinged rods 620 are hinged on the outer peripheral wall of the plunger 610. The plunger 610 is coaxial with the vacuum drying cylinder 200. The diameter of the plunger 610 is matched with the diameter of the first piston cylinder 260 and the second piston cylinder 270. The plunger 610 has a left extreme position and a right extreme position. When in the left extreme position, the plunger 610 blocks the first piston cylinder 260, and the vacuum pumping chamber 220 and the right drying chamber 230 are connected through the connecting hole 280. When in the right extreme position, the plunger 610 blocks the second piston cylinder 270, and the vacuum pumping chamber 220 and the left drying chamber 210 are connected through the connecting hole 280.

[0050] In the initial state, one end of the plunger 610 should be slidably connected to the inside of the first piston cylinder 260 or the second piston cylinder 270 (the description is made by taking the example that one end of the plunger 610 is slidably connected to the inside of the first piston cylinder 260 in the initial state). This is so that after the vacuum drying cylinder 200 rotates, the plunger 610 can be moved in the left and right directions under the action of centrifugal force. After starting the driving assembly 500, the vacuum drying cylinder 200 rotates circumferentially around its axis under the driving action of the driving assembly 500. At this time, the plunger 610 is acted upon by the centrifugal force and continues to move into the inside of the first piston cylinder 260. When the hinged rod 620 After the hinge point of the hinge rod 620 moves along the sliding waist groove 631 to the hinge point of the hinge rod 620 and abuts against one end of the sliding waist groove 631 close to the axis of the vacuum drying cylinder 200, the plunger 610 stops moving into the first piston cylinder 260. At this time, the first piston cylinder 260 is in a blocked state, and the left drying chamber 210 is in a closed state and is not connected to the vacuum exhaust chamber 220. Next, under the heating action of the heating component 300, the air pressure inside the left drying chamber 210 gradually increases. When the air pressure in the left drying chamber 210 increases to a value greater than the centrifugal force on the plunger 610, the plunger 610 Overcoming the centrifugal force, the piston 610 gradually moves away from the bottom of the first piston cylinder 260. When the plunger 610 moves to the dead point of the vacuum chamber 220, under the action of air pressure, the plunger 610 passes the dead point and slides to connect to the inside of the second piston cylinder 270. At this time, the first piston cylinder 260 is no longer blocked by the plunger 610, and the left drying chamber 210 is connected to the vacuum chamber 220. The second piston cylinder 270 is blocked by the plunger 610. Similarly, under the action of centrifugal force, the plunger 610 slides to the bottom of the second piston cylinder 270, and then as the air pressure inside the right drying chamber 230 gradually increases, the second piston cylinder 270 is blocked by the plunger 610. As the vacuum drying cylinder 200 rotates circumferentially and the heating assembly 300 continues to heat the vacuum drying cylinder 200, the plunger 610 moves back and forth in the left and right directions under the joint driving action of centrifugal force and air pressure to achieve alternating sliding connection to the first piston cylinder 260 and the second piston cylinder 270, that is, the left drying chamber 210 and the right drying chamber 230 are alternately connected to the vacuum exhaust chamber 220.

[0051] In a further embodiment, Figure 6As shown, a recoil hole 611 is provided at the center of the plunger 610, and the recoil hole 611 penetrates the plunger 610 along the axis of the plunger 610. A valve 612 is rotatably provided in the recoil hole 611, and the valve 612 can be rotated to open or close the recoil hole 611. The plunger 610 also has an intermediate position, i.e., a dead point position. When in the intermediate position, the plunger 610 simultaneously blocks the first piston cylinder 260 and the second piston cylinder 270, and rotates the valve 612 to open the recoil hole 611, thereby connecting the left drying chamber 210 and the right drying chamber 230.

[0052] When the plunger 610 moves from the first piston cylinder 260 to the middle position (i.e., the dead point position) of the vacuum pumping chamber 220, the plunger 610 simultaneously blocks the first piston cylinder 260 and the second piston cylinder 270. At the same time, the valve 612 rotates and the backwash hole 611 opens. Since the air pressure in the left drying chamber 210 is greater than the air pressure in the right drying chamber 230 at this time, the air in the left drying chamber 210 enters the first piston cylinder 260 through the corresponding connecting hole 280. Further, the air in the first piston cylinder 260 enters the second piston cylinder 270 through the backwash hole 611. The air in the second piston cylinder 270 is ejected outward from the connecting hole 280 on the surface of the second piston cylinder 270, blowing off the metal powder attached to the surface of the corresponding connecting hole 280 of the second piston cylinder 270, preventing the metal powder from clogging the connecting hole 280 of the second piston cylinder 270. When the plunger 610 moves from right to left from the second piston cylinder 270 to the middle position of the vacuum pumping chamber 220, similarly, at this time, the air will blow off the metal powder attached to the surface of the corresponding connecting hole 280 of the first piston cylinder 260, preventing the metal powder from clogging the connecting hole 280 on the surface of the first piston cylinder 260.

[0053] In a further embodiment, Figure 6 and Figure 7 As shown, the valve 612 is a plug valve, which can rotate around its rotation center. The plug valve has four interfaces, which are interconnected and arranged in a cross shape. A one-way valve 613 is provided in each of two adjacent interfaces, and the one-way valve 613 limits the fluid from flowing out of the interface.

[0054] like Figure 6 As shown, at this time, the plunger 610 is slidably connected to the inside of the first piston cylinder 260, and the plunger 610 only blocks the first piston cylinder 260. Since the one-way valve 613 restricts the fluid from flowing out of the interface, the left drying chamber 210 is not connected to the vacuum chamber 220, and the left drying chamber 210 is in a closed state. Under the heating action of the heating component 300, the pressure in the left drying chamber 210 gradually increases. When the pressure in the left drying chamber 210 increases to the point where the plunger 610 moves to the middle position, the stopcock rotates ninety degrees, and the state of the stopcock is switched to Figure 7As shown, since the air pressure in the first piston cylinder 260 is greater than the air pressure in the second piston cylinder 270 at this time, the air in the first piston cylinder 260 flows into the interface of the stopcock through the recoil hole 611, and the air flows out from the recoil hole 611 into the second piston cylinder 270 after passing through the stopcock, blowing off the metal powder attached to the connecting hole 280 on the surface of the second piston cylinder 270. At the same time, driven by the air pressure, the plunger 610 continues to move to the inside of the second piston cylinder 270. At this time, the plunger 610 only blocks the second piston cylinder 270, so the air pressure in the right drying chamber 230 gradually increases. Similarly, when the pressure in the right drying chamber 230 increases to push the plunger 610 to the middle position, the stopcock rotates ninety degrees in the opposite direction. At this time, the state of the stopcock changes from: Figure 7 The switch shown is as follows Figure 6 As shown, in summary, during the reciprocating movement of the plunger 610, each time the plunger 610 moves to the middle position, the stopcock rotates 90 degrees and alternately switches between a forward rotation of 90 degrees and a reverse rotation of 90 degrees, so that the metal powder attached to the surface of the connecting hole 280 is forced to fall off.

[0055] In a further embodiment, Figure 8 As shown, a driving source is also provided on the outside of the plunger 610, and the driving source is used to drive the stopcock to rotate. The driving source can be a servo motor. The shell of the servo motor is arranged on the outside of the plunger 610, and the output end of the servo motor is fixedly connected to the center of the stopcock, which is used to drive the stopcock to rotate through the servo motor. A photoelectric sensor 710 is provided in the vacuum pumping chamber 220, and a reflector 720 is provided at the middle position outside the plunger 610. When the plunger 610 moves to the position where the reflector 720 corresponds to the position of the photoelectric sensor 710, the signal emitted by the photoelectric sensor 710 is reflected by the reflector 720 and received by the photoelectric sensor 710 itself. After receiving the reflected signal, the photoelectric sensor 710 sends an electrical signal to the driving source, and the driving source drives the stopcock to rotate ninety degrees.

[0056] During use, when the plunger 610 moves to the middle position, the position of the reflector 720 corresponds to the position of the photoelectric sensor 710. At this time, the light emitted by the photoelectric sensor 710 is reflected by the reflector 720 and received by the photoelectric sensor 710. The photoelectric sensor 710 converts the received light signal into an electrical signal and sends it to the servo motor. After receiving the electrical signal, the output end of the servo motor rotates ninety degrees, thereby driving the rotary valve to rotate ninety degrees.

[0057] In a further embodiment, the heating component 300 includes a hot fluid pipe 310 and a heat pump 320. The heat pump 320 is arranged on the frame 100, and the output end of the heat pump 320 is connected to the hot fluid pipe 310. A guide interlayer 201 is provided in the vacuum drying cylinder 200, and the guide interlayer 201 is filled with a heating medium, such as pure water. The end of the hot fluid pipe 310 away from the heat pump 320 is rotatably connected to the vacuum drying cylinder 200 and is connected to the guide interlayer 201.

[0058] When in use, the heat pump 320 is started, and the heat pump 320 heats the heating medium in the guide interlayer 201 through the hot fluid pipeline 310, so that the temperature of the vacuum drying cylinder 200 is increased through heat transfer, and the vacuum drying cylinder 200 increases the temperature of the material through heat transfer.

[0059] In other embodiments, an electric heating wire may be provided in the guide interlayer 201 , and the electric heating wire may be connected via an external power source to heat the heating medium in the guide interlayer 201 , so that the temperature of the heating medium is increased.

[0060] It should be added that, in order to improve the temperature uniformity, two inner and outer guiding interlayers 201 may be provided in the wall of the vacuum drying cylinder 200 to ensure the uniformity of heating of the material.

[0061] In a further embodiment, the vacuum pump assembly 400 includes a vacuum pump 410 and a vacuum vacuum pipe 420. The vacuum pump 410 is arranged on the frame 100. The input end of the vacuum pump 410 is connected to one end of the vacuum vacuum pipe 420, and the other end of the vacuum vacuum pipe 420 is connected to the vacuum vacuum chamber 220.

[0062] When in use, start the vacuum pump 410 to pump air outwards through the vacuum pump 410. The vacuum pump 410 pumps the air inside the vacuum pumping chamber 220 outwards through the vacuum pumping pipe 420 to reduce the air pressure in the vacuum pumping chamber 220. The vacuum pumping chamber 220 is connected with the left drying chamber 210 or the right drying chamber 230 to reduce the air pressure in the left drying chamber 210 or the right drying chamber 230.

[0063] In a further embodiment, the driving assembly 500 includes a motor 510, a driving pulley 520, a driven pulley 530 and a center shaft 540. The motor 510 is arranged on the frame 100, the center shaft 540 is coaxially arranged at one end of the vacuum drying cylinder 200, the driven pulley 530 is coaxially arranged at one end of the center shaft 540, the driving pulley 520 is coaxially arranged on the output shaft of the motor 510, and the driving pulley 520 is connected to the driven pulley 530 by belts.

[0064] When in use, the motor 510 is started, and the motor 510 drives the driving pulley 520 to rotate, the driving pulley 520 drives the driven pulley 530 to rotate through the belt, the driven pulley 530 drives the central shaft 540 to rotate, and the central shaft 540 drives the vacuum drying cylinder 200 to rotate, so that the vacuum drying cylinder 200 rotates around its axis.

[0065] It should be supplemented that the vacuum exhaust pipe 420 is divided into two sections, one section is arranged on the vacuum drying cylinder 200, and the other section is arranged on the frame 100, and the two ends are rotatably connected, and the section rotatably connected to the frame 100 passes through the center of the central axis 540 and is rotatably connected to the section arranged on the vacuum drying cylinder 200. The input end of the vacuum pump 410 is specifically fixedly connected to a section arranged on the frame 100 and one end close to the vacuum pump 410.

[0066] In a further embodiment, two inlet / outlet ports 290 are disposed outside the vacuum drying cylinder 200 , and the two inlet / outlet ports 290 are communicated with the left drying chamber 210 and the right drying chamber 230 , respectively.

[0067] Specifically, before drying, materials are added into the left drying chamber 210 and the right drying chamber 230 through the inlet / outlet 290. After drying, materials in the left drying chamber 210 and the right drying chamber 230 are poured out through the inlet / outlet 290.

[0068] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A powder metallurgy dehumidification device, characterized in that: include: frame; A vacuum drying cylinder is rotatably mounted on a frame, the axis of which extends horizontally in the left-right direction, and the interior of the vacuum drying cylinder is sequentially separated from left to right into a left drying chamber, a vacuum exhaust chamber, and a right drying chamber, and the vacuum exhaust chamber can be alternately connected to the left drying chamber and the right drying chamber; A heating component is arranged outside the vacuum drying cylinder and is used to heat the vacuum drying cylinder; The vacuum pumping assembly is arranged outside the vacuum drying cylinder, and the input end of the vacuum pumping assembly is connected to the vacuum pumping chamber, and is used to evacuate the vacuum pumping chamber; A driving assembly, the driving assembly is used to drive the vacuum drying cylinder to rotate circumferentially around its axis; a first isolation ring and a second isolation ring are arranged on the inner circumferential wall of the vacuum drying cylinder from left to right, the left drying chamber is the chamber on the left side of the first isolation ring, the right drying chamber is the chamber on the right side of the second isolation ring, and the vacuum exhaust chamber is the chamber between the first isolation ring and the second isolation ring; A first piston cylinder is coaxially arranged at one end of the first isolating ring, the first piston cylinder penetrates the first isolating ring and extends into the left drying chamber, and a second piston cylinder is coaxially arranged at one end of the second isolating ring, the second piston cylinder penetrates the second isolating ring and extends into the right drying chamber; The first piston cylinder and the second piston cylinder have the same diameter, and a plurality of communication holes are formed on the outer peripheral walls of the first piston cylinder and the second piston cylinder; A sliding assembly is provided in the vacuum pumping chamber, and the sliding assembly can alternately block the left drying chamber and the right drying chamber, so that the vacuum pumping chamber is alternately connected with the left drying chamber and the right drying chamber; the sliding assembly includes a plunger, two hinged rods and two support rods, the two support rods are arranged in the vacuum drying cylinder at equal intervals in the circumferential direction, and the ends of the two support rods close to each other are provided with sliding waist grooves, one end of the two hinged rods is slidably connected in the sliding waist grooves on the corresponding side, and the other ends of the two hinged rods are hinged on the outer peripheral wall of the plunger, the plunger is coaxial with the vacuum drying cylinder, and the diameter of the plunger is adapted to the cylinder diameters of the first piston cylinder and the second piston cylinder; The plunger has a left limit position and a right limit position; When in the left limit position, the plunger blocks the first piston cylinder, and the vacuum pumping chamber and the right drying chamber are connected through the connecting hole; When it is in the right extreme position, the plunger blocks the second piston cylinder, and the vacuum pumping chamber and the left drying chamber are connected through the connecting hole.

2. A powder metallurgy dehumidification device according to claim 1, characterized in that: A recoil hole is provided at the center of the plunger, and the recoil hole penetrates the plunger along the axis of the plunger; A valve is provided in the recoil hole, and the valve can be rotated to open or close the recoil hole; The plunger also has a middle position. When in the middle position, the plunger blocks the first piston cylinder and the second piston cylinder at the same time and causes the valve to rotate so that the recoil hole is opened.

3. A powder metallurgy dehumidification device according to claim 2, characterized in that: The valve is a plug valve, which can rotate around its rotation center. The plug valve has four interfaces, which are interconnected and arranged in a cross shape. Two adjacent interfaces are each provided with a one-way valve, which limits the fluid from flowing out of the interface.

4. A powder metallurgy dehumidification device according to claim 3, characterized in that: A driving source is also provided outside the plunger, and the driving source is used to drive the plug valve to rotate; A photoelectric sensor is provided in the vacuum pumping chamber, and a reflective plate is provided at the middle position outside the plunger; When the plunger moves to the position where the reflector corresponds to the photoelectric sensor, the signal emitted by the photoelectric sensor is reflected by the reflector and received by the photoelectric sensor itself. After receiving the reflected signal, the photoelectric sensor sends an electrical signal to the driving source, and the driving source drives the plug valve to rotate ninety degrees.

5. The powder metallurgy dehumidification device according to claim 1, characterized in that: The heating assembly includes a thermal fluid pipeline and a heat pump. The heat pump is arranged on a frame. The output end of the heat pump is connected to the thermal fluid pipeline. A guide interlayer is arranged in the vacuum drying cylinder. The end of the thermal fluid pipeline away from the heat pump is rotatably connected to the vacuum drying cylinder and communicated with the guide interlayer.

6. The powder metallurgy dehumidification device according to claim 1, characterized in that: The vacuum pump assembly includes a vacuum pump and a vacuum pump pipe. The vacuum pump is arranged on a frame. The input end of the vacuum pump is connected to one end of the vacuum pump pipe, and the other end of the vacuum pump pipe is connected to the vacuum pump chamber.

7. The powder metallurgy dehumidification device according to claim 1, characterized in that: The driving assembly includes a motor, a driving pulley, a driven pulley and a central shaft. The motor is arranged on a frame. The central shaft is coaxially arranged at one end of the vacuum drying cylinder. The driven pulley is coaxially arranged at one end of the central shaft. The driving pulley is coaxially arranged on the output shaft of the motor. The driving pulley is connected to the driven pulley by a belt.

8. The powder metallurgy dehumidification device according to claim 1, characterized in that: The outside of the vacuum drying cylinder is provided with two inlet / outlet ports, and the two inlet / outlet ports are communicated with the left drying chamber and the right drying chamber respectively.

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