CN209093655U - A kind of thickening type powder body material molding machine - Google Patents
A kind of thickening type powder body material molding machine Download PDFInfo
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- CN209093655U CN209093655U CN201821017514.8U CN201821017514U CN209093655U CN 209093655 U CN209093655 U CN 209093655U CN 201821017514 U CN201821017514 U CN 201821017514U CN 209093655 U CN209093655 U CN 209093655U
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Abstract
The utility model provides a kind of thickening type powder body material molding machine, is related to powder depolymerization (homogenizing) preparation, blank forming technical field.The action principle of triboelectrification caused by the polarization electrification or gas shock of this device application electrion needle, powder is set to show homophilic charge, increase rejection to control powder reuniting, substitute traditional powder depolymerization (homogenizing) preparation section, the quality and efficiency of depolymerization operation can be improved, equipment investment and workload are reduced, job costs are reduced.Simultaneously, it increases exchanges in the electrostatic field of blank forming process device electromagnetic field inducing device, make the gas (air and anion gas) being clipped between powder body material Yi Dan be ionized, make orientation eddying motion under the action of induced electric field, it effectively terminates ion and neutralizes the charge that powder carries after escaping in powder coating, the characteristic " from limiting " is eliminated, powder coating layer thickness size is effectively increased and control.Production process can be simplified simultaneously, improve production efficiency, reduce energy consumption.
Description
Technical field
The utility model relates to powder field shaping techniques, form and fill in particular to a kind of thickening type powder body material
It sets.
Background technique
Traditional powder body material technological process of production are as follows: ingredient → blank preparation → blank forming and drying → sintering are solid
Change.However the phenomenon that inevitably will appear powder reuniting in blank preparation process.Since powder has spontaneous reunion
Trend, and the presence reunited will largely effect on the performance of material advantage, influence the final performance of product, therefore how to improve
The dispersibility and stability of powder are highly important operational sequences.
In blank preparation section, common powder depolymerization (homogenizing) method has:
(1) mechanical dispersion forces to separate the powder of reunion, it is desirable that mechanical force has to be larger than particle by mechanical force
Between bonding force.Mechanical dispersion method generally comprises grinding, general milling, vibratory milling, colloid mill and mechanical stirring.It is generally used for
It prevents and destroys and is between powder soft-agglomerated.Its dispersion effect is preferable, but is easily introduced impurity, or changes powder surface characteristic, crystal form
The properties such as structure, after mechanical force stops, reunion can may also occur again.
(2) it is dried, drying process, which refers to by destroying and preventing the liquid bridge formed between powder, controls powder reuniting
Method.But it is homogenized insufficient.There are two methods of interior heating and external heat.
1) heating has an infrared heating and microwave heating in, gasification when heating due to medium inside aggregate into
Row, reduces the capillary force between powder, so as to reduce the hard aggregation between powder.
2) when external heat, medium gasification can carry out on the surface of aggregate, and internal liquid can be conveyed by capillary
To surface, but between powder capillary effect it is inevitable.
(3) organic matter washs, and organic matter washing is the powder for going washing to reunite using the small organic matter of the surface tension of liquid
Body, the moisture of displacement reunion powder surface absorption, reduces hydrogen bond action and capillary force, thus the method for controlling powder reuniting.
But there are organic matter absorption, introduce impurity.
(4) azeotropic distillation, azeotropic distillation method are the entrainers using azeotrope with water, by it is to be distilled containing water, acetic acid and
The method of the mixture azeotropic distillation of methyl acetate etc..Common entrainer is the organic solvents such as diformazan, toluene, benzene alcohol.By powder
Body and organic solvent are stirred, and mixing is moved back to cucurbit azeotropic, boiling point are again heated to after powder mixture dehydration, by one
After fixing time, organic solvent can be discharged, and then powder is dried and is calcined, and can be prepared by the powder of loose soilless sticking.
But the reaction time is long, and the device is complicated.
(5) ultrasonic cavitation, ultrasonic wave are a kind of sound wave of the frequency higher than 20kHz, and good directionality, penetration capacity is strong, is easy to
Obtain the sound energy relatively concentrated.Localized hyperthermia, high pressure, strong shock wave and microjet for generating when using ultrasonic cavitation etc., can be compared with
The effect energy between microbody is significantly weakened, effectively prevent superfine powder micelle poly-, to reach fully dispersed.But ultrasonic wave is fixed
Amount control is complicated.
Therefore, the quality and efficiency of depolymerization operation how are effectively improved, correspondingly equipment investment and workload, drop are reduced
Low job costs become the key factor for influencing industry progress.
In blank forming process, common method has:
(1) the thin and thick film method of forming；
(2) extrusion moulding；
(3) dry pressing；
(4) isostatic pressing method；
(5) slip casting；
(6) injection moulding.
The people for being engaged in related work both knows about: prepared by the above powder depolymerization (homogenizing) and blank forming method is all mature
Technique is widely used.To obtain the target product of high quality, complicated, high value process equipment, operation need to be put into
Time is long and substep is needed to execute.
Utility model content
The purpose of this utility model is to provide a kind of thickening type powder body material molding machine, this device application electrions
The action principle of triboelectrification caused by the polarization electrification or gas shock of needle, makes powder show homophilic charge, increases and repel instead
Powder reuniting should be controlled, substitute traditional powder depolymerization (homogenizing) preparation section, the quality of depolymerization (homogenizing) operation can be improved
With efficiency, corresponding equipment investment and workload are reduced, reduces job costs.Meanwhile in the blank forming process device of powder
Electrostatic field in increase exchanges electromagnetic field inducing device, make the gas (air and anion gas) being clipped between powder body material once
After being ionized, make orientation eddying motion in coating under the action of induced electric field, effectively terminates ion after escaping in coating
The charge of powder carrying is neutralized, characteristic " from limiting " is eliminated, increases and control powder coating layer thickness size.And powder is received
Establishment of component becomes receiving, accommodates the composition target production of powder coating at the contours profiles being adapted with target product structure
The molding die of product green body substitutes traditional blank forming tooling, realizes powder depolymerization (homogenizing) preparation, blank forming one
Change, simplify production process, improve production efficiency, reduces energy consumption.
The utility model is realized in this way:
A kind of thickening type powder body material molding machine, comprising:
Raw material cabin, for storing powder body material；
Spray gun passes through and can produce the runner of fluid negative-pressure, runner and raw material cabin with gas high speed and passes through the first conveying
Pipeline connection for drawing, mixed aerosol, sprays powder body material and polarization powder body material；
Blowing plant is connected to runner by the second conveyance conduit, swiftly flowing pressure for providing compressed air
Contracting air forms negative pressure in runner, and the powder body material drawn in raw material cabin is entered runner by negative pressure；Powder body material is empty in compression
Atomization is mixed under gas impetus in runner or is polarized and is projected from runner；
Powder receiving unit, the powder body material for attracting the transmitting terminal for receiving spray gun to eject, powder receiving unit is just
To spray gun, and show with powder body material the charge of opposite polarity；
Powder depolymerization and driving assembly, powder depolymerization and driving assembly include that (high-pressure electrostatic occurs negative high voltage DC power supply
Device) or DC power supply, a pole of DC power supply connect with spray gun so that runner injection powder body material surface between show stabilization
Property high homophilic charge, increase rejection to control powder body material reunion；Another pole of DC power supply and powder receiving unit
Connection, and the driving electric field with the homophilic charge formation positive-negative polarity shown on spray gun and powder body material；On powder body material
The homophilic charge shown, which becomes, carries the carrier that powder body material moves in driving electric field to powder receiving unit, empty in compression
Under gas thrust and driving electric field collective effect, homophilic charge carries powder body material by the opposite polarity on powder receiving unit
Charge attraction and receive form powder coating.
Further, in the preferred embodiment of the utility model, powder depolymerization and driving assembly are specifically included:
For generating the negative high voltage DC power supply for making powder body material show negative electrical charge and driving electric field；And
Electrion needle, electrion needle are connect with the cathode of negative high voltage DC power supply by high-voltage line, are made in negative high voltage
It is ionized with the lower air made near its end and generates intensive negative aeroion mist namely corona discharging area, and high pressure
Spray point is set in the runner of spray gun or outside runner, and electrion needle contacts with each other with the powder body material in runner or not phase
Mutually contact；Powder body material is polarized after contacting electrion needle in runner, is further polarized after corona discharging area,
Powder body material is set to show the highdensity negative electrical charge of the same sex；Or powder body material is made not contact electrion needle in runner, wear
It is polarized when crossing corona discharging area, powder body material is made to show the negative electrical charge of the higher density of the same sex；Increase rejection to
Powder body material is controlled to reunite；
Wherein, powder receiving unit is connect with the anode of negative high voltage DC power supply by conducting wire, so that powder receiving unit
Show positive polarity, and forms the driving electric field of positive-negative polarity with the negative electrical charge shown on spray gun and powder body material；Powder material
The negative electrical charge shown on material, which becomes, carries the carrier that powder body material moves in driving electric field to powder receiving unit, negative electrical charge
Powder body material is carried under compressed air thrust and driving electric field collective effect, the transmitting terminal transfer for leaving spray gun marches on towards anode
Property powder receiving unit, and be adsorbed on powder receiving unit surface formed powder coating.
Further, in the preferred embodiment of the utility model, powder depolymerization and driving assembly are specifically included:
For generating the frictional static generating assembly for making powder body material show positive charge, frictional static generating assembly is compression
The runner that air assembly is connected to the second conveyance conduit so that powder body material under compressed air impetus in runner with stream
The tube wall and stem or powder body material in road lose the positive charge that electronics shows the same sex of low-density after rubbing between each other, increase
Rejection is to control powder body material reunion；
For generating the DC power supply of driving electric field, powder receiving unit is connected to the cathode of DC power supply and shows cathode
Property, and (electrostatic) driving electric field with the powder body material formation positive-negative polarity for having shown positive charge projected from runner；Powder material
The positive charge shown on material, which becomes, carries the carrier that powder body material moves in (electrostatic) driving electric field to powder receiving unit,
Positive charge carries powder body material under compressed air thrust and (electrostatic) the driving electric field collective effect, leaves the hair of spray gun
It penetrates end transfer and marches on towards the powder receiving unit of negative polarity, and be adsorbed on powder receiving unit surface and form powder coating.
Further, in the preferred embodiment of the utility model, the axial cross section of the runner of spray gun is to rub with promotion
Wipe, generate the variable diameter size of electrostatic；
The tube wall of runner and the material of stem are the organic polymer with low dielectric constant.
Further, in the preferred embodiment of the utility model, the tube wall of runner and the material of stem are with low Jie
The polytetrafluoroethylplastic plastic of matter constant.
Further, in the preferred embodiment of the utility model, the port setting of spray gun is connected to DC power anode
Metallic conduction ring or conductive pin, for absorbing the electricity escaped with powder flowing for neutralizing the electronics assembled and port on spray gun
Son, and flow to the positive of DC power supply out of metallic conduction ring or conductive pin and form recycling electric current, so that powder body material is aobvious
Existing positive charge simultaneously tends towards stability.
Further, in the preferred embodiment of the utility model, thickening type powder body material molding machine further includes setting
Alternating electromagnetic field device in powder receiving unit end, alternating electromagnetic field device is for after making the gas ionization being clipped between powder
Generated ion makees orientation eddying motion under the action of induced electric field in powder coating, to effectively terminate ion from powder
" from limiting " characteristic of powder is eliminated in the escape of body coating, prevents in the ion escaped in powder coating and powder body material surface carries
Charge and lose the ability mutually attracted with the charges of different polarity on powder receiving unit, and then increase and control powder coating layer thickness
Size.
Further, in the preferred embodiment of the utility model, powder receiving unit is to apply for receiving, accommodating powder
Layer constitutes the molding die of target product green body, and molding die has the contours profiles being adapted with target product structure, with reality
Existing powder depolymerization (homogenizing) preparation is moulding integrated with idiosome.
The material of molding die is conductive material resistant to high temperature.
Further, in the preferred embodiment of the utility model, the material of mold is in metal, conductivity ceramics or graphite
It is any.
Further, in the preferred embodiment of the utility model, powder receiving unit is horizontal positioned to be drawn with eliminating the earth
Power influences powder gravity.
Further, in the preferred embodiment of the utility model, alternating electromagnetic field device includes the helical of indirect current
Pipe and magnetic core, solenoid and magnetic core are set to the both ends or one end of target product green body, and section of solenoid and magnetic core
Face shape and the shape of target product green body match, so that target product green body obtains maximum flux.
Above scheme has the advantages that
(1) the utility model provides a kind of thickening type powder body material molding machine, rises using the polarization of electrion needle
The action principle of triboelectrification caused by electricity or gas shock makes powder show homophilic charge, increases rejection to control powder
Body is reunited, and for traditional powder depolymerization (homogenizing) preparation section, is reduced corresponding equipment investment and workload, is reduced cost.
(2) the utility model provides a kind of thickening type powder body material molding machine, configures alternating electromagnetic sensing device, gram
It takes in conventional electrostatic transfer (spraying) powder process, inevitable powder " from limiting " characteristic makes powder coating layer thickness size
It can be to be coated on the coated article of ground connection with controlling with able person.
(3) the utility model provides a kind of thickening type powder body material molding machine, by coated article (powder receiving unit
113) contours profiles being adapted with target product structure are fabricated to, or under the booster action of type core, become receiving, accommodates powder
Body coating constitutes the molding die of target product green body, substitutes traditional blank forming tooling；It is depolymerizated the powder material of (homogenizing)
Material completes transfer process under compressed air thrust and driving electric field collective effect, forms target product green body, substitutes traditional
Blank forming process realizes powder depolymerization (homogenizing) preparation, blank forming integration, reduces production cost.
(4) the utility model provides a kind of thickening type powder body material molding machine, is electrified with the polarization of electrion needle
Or the method for triboelectrification caused by gas shock can complete the action principle of powder depolymerization (homogenizing) preparation, with electromagnetic induction energy
Amount field can generate the thinking that effective control action combines to powder thickness size, and innovation improves, optimizes traditional electrostatic turn
Move (spraying) device, composition magnetic/reply by cable and close energy field system and device；Electrostatic transfer will be applied after powder depolymerization (homogenizing) preparation
The mode of (spraying) is coated in workpiece surface or mold cavity that high temperature resistant can be conductive, prepared as powder depolymerization (homogenizing),
The integrated effective ways of blank forming can be widely used in powder metallurgy workpieces fabrication, and (inorganic non-metallic is solid for ceramics
Body material) workpiece fabrication, the coating of the material with arbitrary thickness size such as plastics or the tree powder body, anti-corrosion, decorative engineering, i.e. institute
There are powder depolymerization (homogenizing) preparation and blank forming process.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram for the first thickening type powder body material molding machine that the embodiments of the present invention provide
One；
Fig. 2 is the structural schematic diagram for the first thickening type powder body material molding machine that the embodiments of the present invention provide
Two；
Fig. 3 is the schematic illustration of the driving electric field of traditional electrion needle and powder receiving unit composition；
Fig. 4 is the structural representation for second of thickening type powder body material molding machine that the embodiments of the present invention provide
Figure；
Fig. 5 is the schematic illustration that the friction that the embodiments of the present invention provide generates the driving electric field being electrostatically-formed；
Fig. 6 is the structural schematic diagram for the third thickening type powder body material molding machine that the embodiments of the present invention provide
One；
Fig. 7 is the structural schematic diagram for the third thickening type powder body material molding machine that the embodiments of the present invention provide
Two；
Fig. 8 is the schematic illustration after the gas in Fig. 4 is ionized；
Fig. 9 is the schematic illustration for the air ion being ionized in ac magnetic field；
Figure 10 is the schematic illustration of the Lenz's law for the electric magnetisation that the embodiments of the present invention provide；
Figure 11 is the schematic illustration under the first environment for the vortex current that the embodiments of the present invention provide；
Figure 12 is the schematic illustration under second of environment for the vortex current that the embodiments of the present invention provide.
Icon: 100- thickening type powder body material molding machine；101- raw material cabin；105- spray gun；The corona discharge region 109-
Domain；111- blowing plant；113- powder receiving unit；115- DC power supply；117- runner；119- negative high voltage DC power supply
(HV generator)；121- electrion needle；123- alternating electromagnetic field device；The metallic conduction ring of 125- positive polarity or
Conductive pin；The first conveyance conduit of 127-；The second conveyance conduit of 129-.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.Therefore, below to attached
The detailed description of the embodiments of the present invention provided in figure is not intended to limit the range of claimed invention,
But it is merely representative of the selected embodiment of the utility model.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without creative efforts, belongs to the model of the utility model protection
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the utility model embodiment, it should be noted that term " center ", "upper", "lower", " left side ",
The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "inner", "outside" is orientation based on the figure or position
Relationship or the utility model product using when the orientation or positional relationship usually put, be merely for convenience of describing this reality
It is described with novel with simplified, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific
Orientation construction and operation, therefore should not be understood as limiting the present invention.In addition, term " first ", " second ", " third "
It is described etc. being only used for distinguishing, is not understood to indicate or imply relative importance.
In the description of the utility model embodiment, it is also necessary to which explanation is unless specifically defined or limited otherwise, art
Language " setting ", " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachable
Connection, or be integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, centre can also be passed through
Medium is indirectly connected, and can be the connection inside two elements.It for the ordinary skill in the art, can specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature is on or below second feature
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above include fisrt feature the
Right above two features and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature is in the second spy
Under sign, lower section and fisrt feature included below be directly below and diagonally below the second feature, or be merely representative of fisrt feature level
Height is less than second feature.
Fig. 1 is that the structure for the first thickening type powder body material molding machine 100 that the embodiments of the present invention provide is shown
It is intended to, Fig. 2 is the structural schematic diagram two of the first thickening type powder body material molding machine provided in this embodiment.Please refer to Fig. 1
With Fig. 2, in the present embodiment, thickening type powder body material molding machine 100 includes raw material cabin 101, spray gun 105, electrostatic drive group
Part, blowing plant 111 and powder receiving unit 113.
Specifically, Fig. 1 and Fig. 2 are please referred to, raw material cabin 101 is for providing powder body material.Spray gun 105 has runner 117, this
Runner 117 passes through with high-speed gas, and can generate the powder body material that fluid negative-pressure is drawn in raw material cabin 101 and enter runner 117.
Runner 117 and raw material cabin 101 be connected tos by the first conveyance conduit 127, for drawing, mixed aerosol and spray powder body material.
Driving assembly is connect with spray gun 105, so that showing homophilic charge between the powder body material sprayed in runner 117, is increased and is repelled instead
It should reunite to control powder body material.Blowing plant 111 passes through the second conveying for providing compressed air, with runner 117
Pipeline 129 is connected to, so that powder body material projects under compressed air impetus from runner 117.Powder receiving unit 113 is just
To spray gun 105, powder body material that the transmitting terminal for receiving spray gun 105 ejects.
Referring to Fig. 1 and Fig. 2, powder depolymerization and driving assembly are specifically included: showing powder body material for generating
The negative direct current high voltage DC power supply 119 of negative electrical charge and driving electric field E；And electrion needle 121, electrion needle 121 and straight
The cathode for flowing negative high voltage generating device 119 is connected by high-voltage line, makes air near its be ionized production under negative high voltage effect
Raw intensive negative aeroion mist (corona discharging area 109), and electrion needle 121 is set in spray gun 105 or spray gun 105
Outside, and electrion needle 121 can contact with each other with the powder body material in runner 117 or not contact with each other.
Medium (solid powder material, fluid material, semifluid material) through compressed air mixed aerosol is sprayed from port, because connecing
Touching spray point 121, which is polarized, shows negative electrical charge, is become by being polarized absorption anion when corona discharging area 109 again
Medium with intensive negative electrical charge repels each other because medium all has homophilic charge, so, medium is in transfer process in dispersion
State is the characterized by techniques that powder coating can homogenize coating.Thus possessed by will be in electrostatic transfer (spraying) powder process
Dielectric property (homophilic charge repels each other), which is applied, substitutes traditional powder depolymerization (homogenizing) system in powder blank preparation section
Standby process.
Wherein, the anode of negative high voltage DC power supply 119 is connect with powder receiving unit 113 by conducting wire, so that powder connects
It receives component 113 and shows positive polarity, and with the electrion needle 121 in spray gun 105 and shown the powder body material shape of negative electrical charge
At the driving electric field E of positive-negative polarity, (size indicates with capital E, and direction from powder receiving unit 113 as shown in figure 3, refer to
To spray gun 105)；The negative electrical charge shown on powder body material, which becomes, carries powder body material in driving electric field E to powder reception group
The carrier that part 113 moves, shows the powder body material of negative electrical charge under compressed air thrust and driving electric field E collective effect, leaves
The transmitting terminal transfer of spray gun 105 marches on towards the powder receiving unit 113 of positive polarity, and is adsorbed on 113 surface shape of powder receiving unit
At powder coating.
Referring to the upper figure in Fig. 1, negative high voltage DC power supply 119 generates negative direct current high voltage (- 60~-90KV), with
Its electrion needle 121 being connected is arranged in spray gun 105, due to the electric discharge needle-discharging of negative high-voltage end, air in its vicinity
It is ionized and generates intensive negative aeroion mist (positively charged ion and negatively charged free electron composition corona discharging area
109)；In corona discharging area 109, positively charged ion marches on towards cathode, in electrion needle 121 and is absorbed, and band is negative
Attraction of the free electron of charge by anode, Xiang Fenti receiving unit 113 or target product object are mobile；It is mixed through compressed air
The medium for closing atomization will be sprayed from port, be polarized negatively charged because contacting electrion needle 121, passed through corona discharging area
It is polarized again when 109 and absorbs anion and become the medium for showing highly dense negative electrical charge, in compressed air thrust and driving
Under electric field E effect, leaves 105 transmitting terminal of spray gun and be transferred to the powder receiving unit 113 of positive polarity or target product object and inhale
Its attached surface.
Fig. 3 is traditional electrion needle 121 and the powder body material and the composition of powder receiving unit 113 for having shown negative electrical charge
Driving electric field E schematic illustration, while stating present in electrostatic transfer (spraying) powder process the characteristic " from limiting ", eventually
The reason of having stopped the increase of powder coating layer thickness size, having limited technique application range.Referring to Fig. 3, by 121 He of electrion needle
The powder body material (negative polarity) of negative electrical charge and the driving electric field E of powder receiving unit 113 (positive polarity) composition are shown, have driven
In the region of electromotive field E, except for air there is also the huge amount anion gas of electronics (absorb), it is a small amount of not by anion and
Free electron, the powder granule with intensive negative electrical charge of powder absorption, under the common driving effect of air-flow and driving electric field E,
It is fast moved along power line to powder receiving unit 113.When free electron, anion and powder with intensive negative electrical charge, connect
Touching or when apart from 113 several centimetres of powder receiving unit, can generate on 113 surface of powder receiving unit such as Fig. 3 institute at once
It is showing, numerical value is equal, opposite polarity charge (referred to as " image charge ").Negatively charged powder and " image charge " it
Between at once will generate a kind of power to attract each other, make powder by firmly " viscous " on 113 surface of powder receiving unit, formation powder
Body coating, and there is certain adhesive strength.Meanwhile not only there is a natural attraction between the sexes makes powder be attracted to powder to connect for pairs of charge
It receives on 113 surface of component, another Interface electric field, size letter e can be also established on 113 surface of powder receiving unit
It indicates, direction is as shown in figure 3, be directed toward positive charge and contrary with driving electric field E from negative electrical charge.With negatively charged freedom
Electronics and accumulation with intensive negative electrical charge powder on 113 surface of powder receiving unit, make the Interface electric field intensity e in powder coating
Constantly increase.In fact, the heavy powder being attached on 113 surface of powder receiving unit of each grain can all generate following coherent work
With: increase the interior accumulation quantity of electric charge-of coating and is applied with " the image charge "-enhancing for increasing the accumulation in powder receiving unit 113 is worth
Layer inner boundary electric field strength e.That is: the quantity of negative electrical charge and Interface electric field intensity e is proportional.
Also, Interface electric field intensity e, which is increased to, to be enough the gas (anion gas and air) being clipped between powder in fact
Apply ionization.At this point, the free electron being present in coating in gas accelerates in Interface electric field, hits and divide gas point
Son, while a large amount of electronics and positively charged ion are generated, since opposite polarity charge attracts each other, therefore negatively charged electricity
Son marches on towards the ground terminal that opposing electronic is positive, and positively charged ion then tries hard to escape from the electrion needle for marching on towards cathode from coating
121.Positively charged ion is collided with powder just in moving process, negatively charged, and positive and negative charge makes originally after neutralizing
Negatively charged powder is in neutrality.As a result, making in driving electric field E just when Interface electric field intensity e reaches certain critical value
Powder in moving process loses energy of position (positive and negative charge neutralization), is adsorbed on powder receiving unit to also just lose
Ability on 113 surfaces shows that there is volitional check powder to apply thickness for conventional electrostatic transfer (spraying) powder equipment (device)
The increased feature of size is spent, referred to as the characteristic " from limiting ", terminates the increase of powder coating layer thickness size.In real work, powder
Coating layer thickness size generally no more than 0.5mm, again again spray thickness also increase it is limited.
Therefore in order to control influence of the characteristic to powder coating layer thickness size " from limiting ", in the present embodiment, it is contemplated that
It is the main reason for forming electrostatic spraying " from limiting " characteristic that powder, which adsorbs intensive negative electrical charge,.Thus, it is negative to reduce powder absorption
The chance and quantity of charge are control " from limiting " characteristics, increase one of the effective ways of coating layer thickness size.
As a preferred option, referring to Fig. 2.In the present embodiment, will be external by electrion needle 121, make powder
Body is not contacted with electrion needle 121.The entrance that powder enters driving electric field E is moved in corona discharging area 109, is reduced
The chance and quantity of powder absorption negative electrical charge.
Fig. 4 is second of molding structural schematic diagram of thickening type powder body material that the embodiments of the present invention provide, and is asked
Refering to Fig. 4, in the present embodiment, as another preferred scheme, powder depolymerization and driving assembly are specifically included: for generating
Powder body material is set to show the frictional static generating assembly of positive charge, frictional static generating assembly is that blowing plant 111 passes through
Runner 117 in the spray gun 105 of second conveyance conduit 129 connection, so that powder body material is flowing under compressed air impetus
Electronics, which is lost, after rubbing between each other in road 117 with the tube wall of runner 117 and stem or powder body material shows the same of low-density
Property positive charge, increase rejection to control powder body material reunion；
For generating the DC power supply 115 of driving electric field, powder receiving unit 113 and the cathode of DC power supply 115 pass through
Conducting wire is connected to and shows negative polarity, and forms positive-negative polarity with the powder body material for having shown positive charge projected from runner 117
(size indicates that the powder body material that direction is projected from spray gun 105 as shown in Figure 5 is directed toward with capital E to (electrostatic) driving electric field E
Powder receiving unit 113)；The positive charge shown on powder body material, which becomes, carries powder body material in (electrostatic) driving electric field E
The carrier moved to powder receiving unit 113, the powder for showing positive charge are total in compressed air thrust and (electrostatic) driving electric field E
Under same-action, the transmitting terminal transfer for leaving spray gun 105 marches on towards the powder receiving unit 113 of negative polarity, and is adsorbed on powder reception
113 surface of component forms powder coating.
Wherein, under the effect of powder fluid negative-pressure caused by compressed air, spray gun 105 is sucked from raw material cabin 101
In runner 117, collides each other or with the tube wall of runner 117 and stem, rub, contact, clutch generation electrostatic.It is produced using friction
The method of raw electrostatic makes object show the method for charge, it is possible to reduce the investment of electrostatic occurrence of equipment reduces equipment investment cost.When
So, the mutual friction of powder phase or electrostatic can be also generated with other materials friction, carry what the density ratio corona discharge of charge generated
Density is low, is control " from limiting " characteristic, increases one of the effective ways of powder coating layer thickness size.
It is further preferred that the electrification polarity and stability of outlet end powder, depend on 117 tube wall of runner and stem system
Make the transfer effect of assembled charge on the dielectric constant and spray gun 105 of material.It is preferred that dielectric constant is low, has self-lubricating function
The tube wall and stem of energy, wear-resisting polytetrafluoroethylplastic plastic PTFE production 105 runner 117 of spray gun.The dielectric constant of PTFE is
1.8~2.1, that is to say, that any substance higher than its dielectric constant, can be obtained after rubbing with it positive charge (such as: ceramics,
Polystyrene plastics, epoxy resin etc.)；Any substance lower than its dielectric constant, can be obtained negative electrical charge after rubbing with it
(such as: air).The simple substance bigger than the dielectric constant of 117 tube wall of runner of spray gun 105 and stem making material plastics PTFE or
Mixture powder with its rub after will become apparent from positive charge, the positive charge on powder become motion carrier, show the powder of positive charge
The powder receiving unit 113 of negative polarity is marched on towards under the collective effect of air-flow and (electrostatic) driving electric field E and adsorbs its surface shape
At powder coating, then it is gathered on spray gun 105 with the charge equivalence negative electrical charge.
Meanwhile the metallic conduction ring or conductive pin 125 and DC power supply 115 of the positive polarity of 105 port of spray gun are set
Anode connection shows positive polarity.The equivalent negative electrical charge on spray gun 105 is gathered in the metallic conduction ring or conductive pin 125 of positive polarity
Under the action of move along conducting wire to 115 anode of DC power supply to form recycling electric current I；In spray gun 105, close to the pipe of runner 117
Wall and stem, the small part compressed air smaller than the dielectric constant of plastics PTFE impact with it, rub after show negative electrical charge absorption
It forms negative aeroion on air, because of the positive charge Xiang Zhonghe that friction shows on negative aeroion and powder granule, reduces
Positive charge density on powder, here it is the reasons that the method that friction generates electrostatic keeps the charge density on powder low；Meanwhile
In the negative electrical charge phase assembled on the equivalent positive charge and spray gun 105 inducted on 117 tube wall of runner and stem by negative aeroion
It closes, reduces recycling electric current I.
Still more preferably, the metallic conduction ring or conductive pin 125 in positive polarity of 105 port of spray gun setting, is used for
The electronics for absorbing the electronics assembled on spray gun 105 and the powder flowing escape with port, so that powder shows positive charge simultaneously
It tends towards stability.
Fig. 5 is that the friction that the embodiments of the present invention provide generates the schematic illustration for being electrostatically-formed driving electric field E.
Referring to Fig. 5, positively charged powder is generated with 113 surface of powder receiving unit, as shown in Figure 5, numerical value is equal, pole
The opposite charge (referred to as " image charge ") of property.One kind will be generated between positively charged powder and " image charge " at once
The power to attract each other makes powder by firmly " viscous " on 113 surface of powder receiving unit, forms powder coating, and have one
Fixed adhesive strength.Meanwhile not only there is a natural attraction between the sexes is attracted to powder on 113 surface of powder receiving unit for pairs of charge,
Another Interface electric field can be also generated on 113 surface of powder receiving unit, size is indicated with letter e, direction such as Fig. 5 institute
Show, is directed toward positive charge and contrary with driving electric field E from negative electrical charge.So powder coating area is by positively charged powder
Body, the air being sandwiched between powder, the Interface electric field e constantly enhanced as coating layer thickness increases are constituted.Because of triboelectrification
Effect has polarized than negative high voltage body, and electrical effect is much lower by the obtainable charge density of powder, and the effect of " from limiting " characteristic is also dropped
It is low.So powder coating layer thickness size increases, more than 0.5mm.But the Interface electric field e constantly enhanced still will be ionized and be pressed from both sides
Gas between powder still will generate the characteristic " from limiting ", further increase to limit powder coating layer thickness size.
Fig. 6 is that the structure for the third thickening type powder body material molding machine 100 that the embodiments of the present invention provide is shown
It is intended to one；Fig. 7 is the structural schematic diagram two of the third thickening type powder body material molding machine provided in this embodiment.Please refer to figure
6 and Fig. 7, in the present embodiment, thickening type powder body material molding machine 100 further include being set to 113 end of powder receiving unit
Alternating electromagnetic field device 123, alternating electromagnetic field device 123 is for making to be clipped between powder ionized gas in induced electric field
Make orientation eddying motion under effect, so that effectively termination ion from coating escape, prevents in the ion escaped in coating and powder
Material surface carry charge and lose the ability mutually attracted with the charges of different polarity of powder receiving unit 113, thoroughly eliminate powder
Self-limiting characteristics, and then increase and control powder coating layer thickness size.
Fig. 8 is the schematic illustration after the gas in Fig. 4 is ionized；Fig. 8 be the embodiments of the present invention provide
In alternating magnetic field, the schematic illustration of ionized gas ion；Fig. 9 is the electric magnetisation that the embodiments of the present invention provide
Lenz's law schematic illustration, Figure 10 is that the embodiments of the present invention the vortex current I that provides and Induced magnetic field N ' exist
Schematic illustration under the first environment, Figure 11 are that the vortex current I that the embodiments of the present invention provide and Induced magnetic field N ' exist
Schematic illustration under second of environment.Fig. 8 to Figure 11 is please referred to, in the present embodiment, powder coating one occurs special " from limiting "
Property, show that the gas being clipped between powder has been ionized, forms positively charged and negatively charged gas ion, macroscopically, gas
The positive and negative amount of charge that body is ionized generation is equal.Ionized gas, resistance can be considered " O ", be good conductors.It is ionized
Gas vivaciously generates dynamic electric field very much, has dilatancy, and positively charged and negatively charged gas ion has respective absorption
The charges of different polarity reach the ability of balance, and motion profile is perpendicular to powder coating surface.The eddy electric field proposed according to Maxwell
With the core concept of displacement current hypothesis: changing magnetic field can excite eddy electric field, and the electric field of variation can excite vortex magnetic
?；Electric and magnetic fields be not it is isolated each other, they connect each other, mutual one unified electromagnetic field of excitation composition.Alternating current
The alternating magnetic field N of magnetic field device 123 from scratch, from having to nothing, can be seen as changing.Ionized gas ion is considered as and is led
Body material is placed in the continually changing magnetic field N of magnetic flux, excites the eddy electric field inducted, and generates vortex current I, electromotive force
In with neither head nor tail closed curve, the not no concept of potential difference.Ionized gas ion orients under the action of vortex current
Energy eddying motion, eddying motion direction is consistent with the direction vortex current I, effectively terminates ion and escapes from coating.Meanwhile induced electricity
The magnetic field of stream always hinders the variation for causing faradic magnetic flux.The vortex current I that inducts, which is generated, to be hindered to cause eddy electric field
Magnetic flux changing magnetic field N ', determine the direction of rotation vortex current I.
The alternating magnetic field N of alternating electromagnetic field device 123 is in increase state from scratch (magnetic field enters powder coating).Alternation
Magnetic field N magnetic flux increases, and powder coating is in the magnetic field that magnetic flux to be become larger.Necessarily there is vortex current I an obstruction to hand over
Induced magnetic field N ' that varying magnetic field N becomes larger, that direction is opposite with alternating magnetic field N.The direction of known magnetic field N ', is considered as vortex current
Energization solenoid.It is determined according to right-hand screw rule (also referred to as Ampere's law) is (as shown in Figure 8): ring of the vortex current in diagram 9
Under border, vortex current I is rotated in the counterclockwise direction.
The alternating magnetic field N of alternating electromagnetic field device 123 is from having to nothing (leaving powder coating in magnetic field), in reduction state.Alternation
Magnetic field N magnetic flux is reduced, and powder coating is in the magnetic field that magnetic flux to be become smaller.Necessarily there is vortex current I an obstruction to hand over
Varying magnetic field N becomes smaller, direction and the identical Induced magnetic field N ' of alternating magnetic field N, supplement magnetic flux hinder alternating magnetic field N to become smaller.?
Know magnetic field N ' direction, vortex current is considered as energization solenoid.According to right-hand screw rule (also referred to as Ampere's law) (such as Figure 10
It is shown) it determines: for vortex current in the environment of illustrating 12, vortex current I is also to be rotated in the counterclockwise direction.
No matter how the magnetic flux of the additional alternating magnetic field N of powder coating changes, and the directional-rotation direction of gas ion is not
Become, limit the evolution of gas ion in powder coating, make conductor magneto-electric energy field be applied to powder depolymerization (homogenizing) preparation section,
The molding procedure integration that conductor magneto-electric energy field is applied to green body just has feasibility, and can thoroughly eliminate the characteristic " from limiting ", effectively
Increase and control powder coating layer thickness size, establishes technical know-how basis to prepare the workpiece of different-thickness size.Gas ion
Eddying motion make the powder in coating generate heat, embody electricity-magnetic-heat energy conversion relation.Heat produced will
Be used effectively (drying and curing powder coating material).Under the conditions of atmospheric pressure at room, the powder of coating is constituted, it is especially inorganic non-
Metal compound powder, (powder tightness is high for the polarized state formed in Interface electric field of submitting a written statement to a higher authority.In the same direction, there is electricity
Gesture does not have electric current, even removes additional driving electric field and still maintains polarized state.), make powder green body that there is certain bonding
Intensity moves into sintering process conducive to green body.Meanwhile generating the distance between powder and approaching advantage, make the powder to contact with each other
Neck area increases, and substance diffusion, porosity decline during acceleration of sintering, blank density improve.Meanwhile polarity effect volume
Other places increases the surface energy of powder.According to least-energy principle, the power for pushing sintering is increased, crystal grain is promoted to generate, add
Fast chemistry reaction, raising powder density, reduction sinter porcelain temperature into.This is also to be sintered to inorganic non-metallic compound powder material
The mostly important dynamic Theory of process.
It is further preferred that in the present embodiment, powder receiving unit 113 is to constitute for receiving, accommodating powder coating
The molding die of target product green body, mold has the contours profiles being adapted with target product structure, to realize powder body material
Depolymerization (homogenizing) preparation is moulding integrated with idiosome, reduces production cost.
The material of mold is any one of metal, conductivity ceramics or graphite.The material of coring processed must be easily defeated and dispersed
Non-conductor, have silica sand, lime stone, tung oil etc..Certainly, in the embodiments of the present invention, further include mold selection with
Structure, size of blank etc., the embodiments of the present invention repeat no more.
Powder receiving unit 113 is horizontal positioned to be influenced with eliminating terrestrial gravitation to powder gravity.Alternating electromagnetic field device 123
Solenoid and magnetic core including indirect current, solenoid and magnetic core are set to the both ends or one end of powder coating, and helical
Pipe and the cross-sectional shape of magnetic core and the shape of target product green body match, so that green body obtains maximum flux.Meanwhile it producing
The solenoid of raw electromagnetic field and the technical parameter of magnetic core need test data to determine.
In conclusion the beneficial effect for the thickening type powder body material molding machine 100 that the embodiments of the present invention provide
Are as follows:
(1) the utility model provides a kind of thickening type powder body material molding machine 100, using electrion needle 121
The action principle of triboelectrification caused by polarization electrification or gas shock, makes powder show homophilic charge, increases rejection and comes
Powder reuniting is controlled, traditional depolymerization (homogenizing) preparation section of powder blank is substituted, reduces corresponding equipment investment and workload,
Reduce cost.
(2) the utility model provides a kind of thickening type powder body material molding machine 100, configuration alternating electromagnetic induction dress
It sets, overcomes in conventional electrostatic transfer (spraying) powder process, inevitable powder " from limiting " characteristic makes coating layer thickness size
It can be to be coated on the coated article of ground connection with controlling with able person.
(3) the utility model provides a kind of thickening type powder body material molding machine 100, by coated article (powder reception group
Part 113) contours profiles being adapted with product structure are fabricated to, become receiving, accommodate powder coating composition target product green body
Molding die reapply the transfer that electrostatic transfer (spraying) principle completes powder blank or under the booster action of type core
Journey forms target product green body, substitutes traditional molding procedure of powder, realizes powder depolymerization (homogenizing) preparation, blank molding one
Body reduces production cost.
(4) the utility model provides a kind of thickening type powder body material molding machine 100, with the pole of electrion needle 121
The method for changing triboelectrification caused by electrification or gas shock can make the action principle of powder depolymerization (homogenizing), with electromagnetic induction energy
Amount field can generate the thinking that effective control action combines to powder thickness size, and innovation improves, optimization conventional electrostatic shifts
(spraying) device, composition magnetic/reply by cable and close energy field system and device.By the powder application electrostatic transfer (spraying) after depolymerization (homogenizing)
Mode be coated to can be conductive workpiece surface or mold cavity in, it is integrated as powder depolymerization (homogenizing) preparation, blank forming
The effective ways of change can be widely used in powder metallurgy workpieces fabrication, ceramic (inorganic non-metal solid material) workpiece
Fabrication, the coating of plastics or the tree powder body material with arbitrary thickness size, anti-corrosion, decorative engineering, i.e., all powder blank systems
Standby and molding procedure.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of thickening type powder body material molding machine characterized by comprising
Raw material cabin, for storing powder body material；
Spray gun, the runner that there is the spray gun gas high speed to pass through and can produce fluid negative-pressure, the runner and the raw material cabin
It is connected to by the first conveyance conduit, for drawing, mixed aerosol, sprays the powder body material and the polarization powder body material；
Blowing plant is connected to the runner by the second conveyance conduit, swiftly flowing institute for providing compressed air
It states compressed air and generates the negative pressure in the runner, the powder body material in raw material cabin described in the negative pressure absorbing enters
The runner；The powder body material is mixed atomization in the runner under the compressed air impetus, is polarized simultaneously
It is projected from the runner；
Powder receiving unit, the powder body material for attracting the transmitting terminal for receiving the spray gun to eject, the powder connect
Spray gun described in component face is received, and shows the charge of opposite polarity with the powder body material；
Powder depolymerization and driving assembly, the powder depolymerization and driving assembly include negative high voltage DC power supply or DC power supply, institute
The pole for stating DC power supply is connect with the spray gun, so that showing stabilization between the powder body material surface of runner injection
Property high homophilic charge, increase rejection and reunite to control the powder body material；Another pole of DC power supply with it is described
The connection of powder receiving unit, and positive and negative anodes are formed with the homophilic charge shown on the spray gun and the powder body material
The driving electric field of property；The homophilic charge shown on the powder body material, which becomes, carries the powder body material in the driving
The carrier moved in electric field to the powder receiving unit, under the compressed air thrust and driving electric field collective effect, institute
Homophilic charge is stated to carry the powder body material by the charge attraction of the opposite polarity on the powder receiving unit and connect
Receipts form powder coating.
2. thickening type powder body material molding machine according to claim 1, which is characterized in that the powder depolymerization and driving
Component specifically includes:
For generating the negative high voltage DC power supply for making powder body material show negative electrical charge and driving electric field；And
Electrion needle, the electrion needle are connect with the cathode of the negative high voltage DC power supply by high-voltage line, in negative height
So that the air near its end, which is ionized, generates intensive negative aeroion mist namely corona discharging area under pressure effect, and
The electrion needle is set in the runner of the spray gun or outside the runner, and the electrion needle and the stream
The powder body material in road contacts with each other or does not contact with each other；The powder body material contacts the height in the runner and presses
It is polarized after acusector, further polarized after the corona discharging area, the powder body material is made to show the highly dense of the same sex
The negative electrical charge of degree；Or makes the powder body material not contact the electrion needle in the runner, put across the corona
It is polarized when electric region, the powder body material is made to show the negative electrical charge of the higher density of the same sex；Increase rejection to
The powder body material is controlled to reunite；
Wherein, the powder receiving unit is connect with the anode of the negative high voltage DC power supply by conducting wire, so that the powder
Receiving unit shows positive polarity, and forms positive and negative anodes with the negative electrical charge shown on the spray gun and the powder body material
The driving electric field of property；The negative electrical charge shown on the powder body material, which becomes, carries the powder body material in the driving electricity
The carrier moved in the powder receiving unit, the negative electrical charge carry the powder body material and push away in the compressed air
Under power and the driving electric field collective effect, the transmitting terminal transfer for leaving the spray gun marches on towards the powder of the positive polarity and connects
Component is received, and is adsorbed on powder receiving unit surface and forms the powder coating.
3. thickening type powder body material molding machine according to claim 1, which is characterized in that the powder depolymerization and driving
Component specifically includes:
For generating the frictional static generating assembly for making powder body material show positive charge, the frictional static generating assembly is described
The runner that blowing plant is connected to the second conveyance conduit is made so that the powder body material is pushed in the compressed air
Electronics is lost after rubbing between each other in the runner with the tube wall of the runner and stem or the powder body material under
Show the positive charge of the same sex of low-density, increases rejection and reunite to control the powder body material；
For generating the DC power supply of driving electric field, the powder receiving unit is connected to the cathode of the DC power supply and is shown
Negative polarity, and driven with the electrostatic of the powder body material formation positive-negative polarity for having shown the positive charge projected from the runner
Electromotive field；The positive charge shown on the powder body material, which becomes, carries the powder body material in the electrostatic drive electric field
The middle carrier moved to the powder receiving unit, the positive charge carry the powder body material in the compressed air thrust
Under the electrostatic drive electric field collective effect, the transmitting terminal transfer for leaving the spray gun marches on towards the powder of the negative polarity
Receiving unit, and be adsorbed on powder receiving unit surface and form the powder coating.
4. thickening type powder body material molding machine according to claim 3, it is characterised in that:
The axial cross section of the runner of the spray gun is with the variable diameter size for promoting friction, generating electrostatic；
The tube wall of the runner and the material of stem are the organic polymer with low dielectric constant.
5. thickening type powder body material molding machine according to claim 3, it is characterised in that:
The metallic conduction ring or conductive pin being connected to the DC power anode is arranged in the port of the spray gun, for absorbing, in
With the electronics of the electronics and the port assembled on the spray gun escaped with powder flowing, and from the metallic conduction ring or lead
The anode that the DC power supply is flowed in acusector forms recycling electric current, so that the powder body material shows the positive charge simultaneously
It tends towards stability.
6. the thickening type powder body material molding machine according to any one of claim 2 to 5, it is characterised in that:
The thickening type powder body material molding machine further includes the alternating electromagnetic field device for being set to powder receiving unit end,
The alternating electromagnetic field device is used to make after the gas ionization being clipped between powder generated ion in the effect of induced electric field
Under make orientation eddying motion in coating, thus effectively terminate ion escape from the powder coating eliminate powder " from limit
System " characteristic, prevents the ion escaped in the powder coating from neutralizing the charge that the powder body material surface carries, and loses
The ability mutually attracted with the charge of the opposite polarity on the powder receiving unit, and then increase and control powder and apply thickness
Spend size.
7. thickening type powder body material molding machine according to claim 6, it is characterised in that:
The powder receiving unit be for receive, accommodate powder coating constitute target product green body molding die, it is described at
Pattern tool has the contours profiles being adapted with the target product structure, to realize that the preparation of powder depolymerization homogenizing and idiosome form
Integration.
8. thickening type powder body material molding machine according to claim 7, it is characterised in that:
The material of the mold is conductive material resistant to high temperature.
9. thickening type powder body material molding machine according to claim 7, it is characterised in that:
The powder receiving unit is horizontal positioned to be influenced with eliminating terrestrial gravitation to the gravity of powder.
10. thickening type powder body material molding machine according to claim 7, it is characterised in that:
The alternating electromagnetic field device includes the solenoid and magnetic core of indirect current, and the solenoid and magnetic core are set to institute
The both ends or one end of target product green body are stated, and outside the cross-sectional shape of the solenoid and magnetic core and the target product green body
Shape matches, so that the target product green body obtains maximum flux.
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| CN108554663A (en) * | 2018-06-27 | 2018-09-21 | 湖北金稽山机械科技有限公司 | A kind of thickening powder body material molding machine |
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