CN207102762U - Automatically control continuous refrigeration grinding machine - Google Patents
Automatically control continuous refrigeration grinding machine Download PDFInfo
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- CN207102762U CN207102762U CN201721024114.5U CN201721024114U CN207102762U CN 207102762 U CN207102762 U CN 207102762U CN 201721024114 U CN201721024114 U CN 201721024114U CN 207102762 U CN207102762 U CN 207102762U
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Abstract
It the utility model is related to a kind of refrigeration grinding machine, grinder includes vibro-grinding device and pressing device, vibro-grinding device includes grinding assembly, vibration component and support component, grinding assembly includes pressure roller, grind box and spacer, pressing device compresses or loosened grinding assembly, grinding assembly is connected with vibration component, and grinding assembly and vibration component are arranged in support component.Refrigeration grinding machine of the present utility model has the characteristics of grinding efficiency is high, hard crisp sample can be ground to below 200 mesh within a few minutes, and single amount of grinding reaches as high as 2kg；And grinding temperature scope is wide, the temperature range grinding of normal temperature~170 DEG C can be achieved.
Description
Technical field
It the utility model is related to grinding technique field, and in particular to automatic control type cryogenic mill.
Background technology
Need to carry out attrition grinding processing to sample in experiment, prepare the even nano level laboratory sample of fine particle size.
Generally, material is hard crisp, more easily grinds.But under normal temperature not all material all show as it is hard, crisp
Property, some materials showed exactly toughness, viscosity, high temperature sensitivity originally.Particularly in process of lapping, because grinding is made
With the hot environment brought, material easily softens, becomes sticky, gone bad.This is just can solve using freezing processing to ask
Topic, under cold service, heat sensitivity material, a variety of animal vegetable tissues, microorganism, rubber, plastics, food, medicine, coal,
Oil shale, wax work, PE, PS, textile, resin etc. at normal temperatures in toughness, be difficult to the material that crushes, can also realize grinding.
Realize that low-temperature treatment ground sample there can be various ways.Wherein most plain mode is that sample directly is placed in into refrigerator
Or in cooling medium in (such as liquid nitrogen, dry ice), after sample freezing is brittle, then it is ground on conventional grinders.But
Because continuous lasting cooling can not be provided, such a mode is only applicable to that milling time is short, is very easy to the sample ground.
Run into it is sticky big or during to requiring to finally obtain the less sample of particle, it is necessary to be carried out continuously cooling processing, such a mode can not
Continuous freezing is realized, and needs human contact's cooling medium operation inconvenience, have by the danger of Cryogenic burns.
Being achieved in that for another more suitably freeze grinding, existing grinder is directly coupled to by cooling device, real
Present wire type freeze grinding：Common practice is entirely to design grinding assembly in a low temperature casing, and casing directly concatenates
Cold wind or steel cylinder the supply refrigerant (such as liquid nitrogen, dry ice cooling agent) that air cooler provides, cool down whole grinding component, pass through thing
Cooling freezing is realized in the conduction of reason to ground sample indirectly so that ground sample is carried out all in low temperature.Patent document
CN2621812Y, CN103386347A, CN2621811Y are exactly to be improved using such a mode on the basis of planetary ball mill
Low temp planetary ball mill is obtained, structure is simpler, if can only be realized compared with cryogrinding using air cooler, using low temperature cold
Matchmaker's (liquid nitrogen, dry ice etc.) can then realize the grinding of very low temperature.But the characteristics of due to planetary ball mill, grinding energy is low,
Reach the grinding of certain particle size (such as nanoscale) needs for a long time, therefore cooling agent consumption is bigger.Patent document
CN104492552A is then to use that the design of single ball grinder main frame is placed in jacketed vessel respectively, and liquid is passed through in jacketed vessel
Nitrogen, liquid nitrogen are supplied by external liquid nitrogen supply bottle.Due to directly contacting cold, cooling effectiveness and cooling agent utilization rate to single ball grinder
Compare high.It is operational poor but control controls manually using simple valve, and equally exist that milling time is long, grinding efficiency is low
The problem of.Patent US8061633B2 is then that the online freezing mode of liquid nitrogen is coupled on magnetic force ball mill, realization very low temperature
Sample is ground, prepared by the grinding such as biology laboratory temperature sensitivity sample for being particularly suitable for small lot.
In laboratory such as food experiment room, there is the substantial amounts of food sample such as sample such as vegetables, candy to need to grind, but be based on
Milling time, amount of grinding, ease of use security, cooling agent efficiently seen using upper factors, at present either planet
Formula cryogrinding, or liquid nitrogen freeze Magnetic Force Mill online, can not all meet the fast of the soft toughness sample of laboratory moderate
Fast freeze grinding.
Utility model content
Technical problem present in currently available technology is ground sample first to be done into freezing processing under cryogenic media, so
The processing mode being ground afterwards have operation inconvenience, can not continuous freeze grinding the problems such as；Using low temperature planetary ball mill, use
During air cooling compressor cooling, it is difficult to obtain than relatively low temperature, restricted application, and use the media such as liquid nitrogen directly to exist
During line freezing mode, the utilization rate of cooling agent is not high；Prior art can not meet to require the single batch processing amount in more than 500ml
Freeze grinding treating capacity, most for the treatment of capacities that can only handle 10-100mL.
The present inventor has found that the protrusion that there is vibrating-disk grinder high energy quickly to grind is excellent to solve above-mentioned technical problem
Point, liquid nitrogen frozen system is coupled with vibrating-disk grinder, disclosure satisfy that the processing requirement that single batch is quickly ground, together
When by designing automatic control system, ensure security, ease of use, the efficient usability of liquid nitrogen.
Specifically, the utility model proposes following technical scheme：
The utility model provides refrigeration grinding machine, and the grinder includes vibro-grinding device and pressing device, and vibration is ground
Mill apparatus includes grinding assembly, vibration component and support component, and grinding assembly includes pressure roller, grind box and spacer, pressing device pressure
Tightly or loosen grinding assembly, grinding assembly is connected with vibration component, and grinding assembly and vibration component are arranged in support component.
Preferably, above-mentioned refrigeration grinding machine, wherein, the pressure roller is located in grind box, and grind box is located in spacer, and spacer is set
Put into hole and portal；It is preferred that the grinding volume of the grinding box is 100-3000ml；It is preferred that the quality of grinding assembly is 13-
19kg；It is further preferred that the spacer is selected from polytetrafluoroethylene (PTFE), polytrifluorochloroethylene, PEI, polysulfones, poly- with material
Fragrant sulfone, polyether sulfone, makrolon and/or polyethylene.
Preferably, above-mentioned refrigeration grinding machine, wherein, the support component includes supporting plate, pedestal and base, pedestal position
Above base, supporting plate is located above pedestal；It is preferred that grinding assembly is arranged on above supporting plate, further preferred grinding assembly
Heat insulating mattress is set between supporting plate.
Preferably, above-mentioned refrigeration grinding machine, wherein, the vibration component includes motor and eccentric wheel, preferably eccentric wheel
Below supporting plate；The quality of preferred eccentric wheel is 8-16kg.
Preferably, above-mentioned refrigeration grinding machine, wherein, the vibro-grinding device includes elastomeric element；It is preferable described
Elastomeric element includes compression spring and extension spring as needed and/or beam.
Preferably, above-mentioned refrigeration grinding machine, wherein, the compression spring is distributed between pedestal and supporting plate
On the outside of motor；It is preferred that the extension spring is horizontally mounted the adjacent compression spring of connection；More preferably described beam be located at pedestal and
Between base.
Preferably, above-mentioned refrigeration grinding machine, wherein, pressing device includes compression end, curved boom and fixing end, preferably compresses
Bellows cylinder is selected at end, and more preferably bellows cylinder is fixed with curved boom one end, and the curved boom other end is fixed with rotary shaft, and rotary shaft is set
In the bearing of fixing end, fixing end is fixed on the supporting plate.
Preferably, above-mentioned refrigeration grinding machine, wherein, the fixing end installs stopping means；It is preferred that stopping means passes through
Perforate inserted magnet, curved boom is attracted in station position.
Preferably, above-mentioned refrigeration grinding machine, wherein, the station includes compressing station and loosens station, and curved boom is limited
Positioned at when compressing station, bellows cylinder is located above grinding assembly, and curved boom is rotated horizontally to station is loosened, and bellows cylinder is remote to be ground
Grind above component.
Preferably, above-mentioned refrigeration grinding machine, wherein, heat insulating mattress is set above the grinding assembly；It is preferred that heat insulating mattress is opened
Positioning hole, bellows cylinder set keeper, and positioning hole coordinates with keeper.
Preferably, above-mentioned refrigeration grinding machine, wherein, the refrigeration grinding machine includes housing, and housing includes upper cover part
And support section, support section install shockproof lower margin and universal caster wheel；It is preferred that housing uses sheet metal component, case inside laying sound insulation
Cotton, housing seal gap use sealing strip double-layer seal.
The beneficial effects of the utility model include：
1. refrigeration grinding machine of the present utility model has the characteristics of grinding efficiency is high, hard crisp sample can be ground within a few minutes
It is milled to below 200 mesh, and single amount of grinding reaches as high as 2kg.
2. from liquid nitrogen as cooling agent, grinding temperature scope is wide, and the temperature range grinding of normal temperature~-170 DEG C can be achieved.
3. devising the system with automatic control function, online continuous freeze grinding is realized, can not only be met very well
Soft, toughness sample grinding requirement is presented to normal temperature for assay laboratory, moreover it is possible to ensures processing safety, ease of use, liquid
The efficient usability of nitrogen.
4. outstanding feature of the present utility model is the cryogenic freezing and control system, circuit being made up of grinding system, liquid nitrogen
The most of composition of control system, cold insulation system etc. 4, structure is clearly demarcated, and routine use does not need special maintenance, the side of operating with substantially
Just.Whole system automaticity is high, and 4 major parts are carried out being uniformly coordinated control, easy to operate, liquid by PLC
The cryogenic freezing that nitrogen is formed has anti-liquid nitrogen overvoltage splash to design with control system, improves peace property, and grind box component covers it with liquid nitrogen bath
Between use air clamper, ensure the seal of sample and liquid nitrogen.
Brief description of the drawings
Fig. 1 is the low temperature shock lapping device for connecting liquid nitrogen container, in figure：1st, liquid nitrogen container；2nd, pressure roller；3rd, grind box；4th, air bag
Cylinder；5th, grind box lid；6th, spacer；7th, supporting plate；8th, compression spring；9th, extension spring；10th, eccentric wheel；11st, pedestal；12nd, bottom
Seat；13rd, motor；24th, heat insulating mattress；25th, keeper；26th, spring support；27th, inlet opening；28th, venthole；29th, heat insulating mattress positions
Hole.
Fig. 2 is pressing device schematic diagram, in figure：4th, bellows cylinder；14th, rotary shaft；15th, bearing；16th, curved boom；23rd, silica gel
Sealing gasket；30th, stopping means.
Fig. 3 is refrigeration grinding machine body diagram, in figure：17th, upper cover part；18th, support section；19th, universal wheel；20、
Lower margin；21st, support；22nd, sheet metal shell；31st, sealing strip.
Fig. 4 is freeze grinding system schematic, and freeze grinding system includes liquid nitrogen container, pipeline, magnetic valve, temperature sensor
1st, temperature sensor 2 and refrigeration grinding machine, liquid nitrogen lead to outdoor after becoming nitrogen.
Fig. 5 is polytetrafluoroethylhelix helix tube schematic diagram.
Fig. 6 is freeze grinding system operation flow chart, including is put into grind box pneumatic clamping, sets systematic parameter, startup to set
Standby beginning precooling, precooling are completed to start to grind, grind completion taking-up mould, manual valve opening gas drain steps.
Embodiment
The preferable refrigeration grinding machine of the utility model, freeze grinding system and its advantageous effects enter below in conjunction with the accompanying drawings
Row describes in detail.
The preferable refrigeration grinding machine of the utility model includes low temperature shock lapping device, pressing device and sheet metal component housing,
The refrigerant that refrigeration grinding machine is provided by refrigerated source realizes freezing function.
As shown in figure 1, low temperature shock lapping device include grinding assembly, motor, eccentric wheel, compression spring, extension spring,
Liquid nitrogen is transported to lapping device by pedestal, supporting plate, base, liquid nitrogen container as refrigerated source by pipeline.Refrigerated source connection grinding
Component, grinding assembly include pressure roller, grind box and spacer, and pressure roller is located in grind box, and grind box has grinding tool tank and grinding tool lid, grind box choosing
It is located at by the use of alloy such as steel or aluminium as material of main part, grind box in spacer, spacer sets an inlet opening and two ventholes,
Refrigerated source selects liquid nitrogen, and liquid nitrogen is entered between spacer and grind box by pipeline from inlet opening, carries out after heat exchange nitrogen from outlet
Hole is discharged, and two ventholes can ensure that internal pressure discharges completely；Compression mode takes bellows cylinder to compress mode, ensures close
Feng Xing.Spacer takes all less polytetrafluoro material of specific heat capacity and thermal conductivity, greatly improves spacer inside cold efficiency, while
Reduce extraneous air and internal heat exchange, play a part of insulation.Grinding assembly is arranged on above supporting plate, grinding assembly
Heat insulating mattress is set between supporting plate, and vibrating device can not be passed to by ensureing the low temperature environment of refrigeration system；Eccentric wheel is positioned at support
Below plate, it is connected with motor, motor is fixed on pedestal, and compression spring is vertically-mounted, between pedestal and supporting plate, distribution
On the outside of motor, play a part of supporting up and down, extension spring is horizontally mounted, and two adjacent compression bullets are connected by spring support
Spring, play a part of pretension, rotating speed is too low when preventing from starting produces abnormal vibration.Beam is set between pedestal and base,
The fixed effect of buffering is played when equipment is run.
Amplitude size is determined according to grind box size, the exciting force according to needed for magnitude determinations, and then adjust eccentric wheel size.Its
Calculating process is as follows：
Exciting force is caused by eccentric wheel：F=m1w2r1………①
In formula：m1- eccentric wheel quality
W- rotational angular velocities
r1Distance of-eccentric wheel the barycenter to electrical axis
Exciting force is that a size is constant, the power of direction time changing.Its action effect causes whole mass of vibration to do
Circular motion, produce an amplitude r2。
Will motion is equivalent into power caused by motion caused by power, establish the model of mass of vibration uniform circular motion.
F=m2w2r2………②
In formula:m2- eccentric wheel quality
W- rotational angular velocities
r2- vibrational system amplitude
1. 2. convolution is drawn a conclusion
Amplitude r2=(m1/m2)·r1
Realizing the grinding of big volume just needs bigger centrifugal force, by redesigning eccentric wheel, increases eccentric wheel
Weight and the distance of eccentric wheel weight center to center, it is possible to realize bigger centrifugal force, can thus meet more Large Copacity
The grinding of material, the preferable grinding assembly weight of the utility model are 16 ± 3kg, and the dischargeable capacity of grinding box (can add raw material
Volume, usually 1/2) that grinding box volume is 50-1500ml, and volume is not changing eccentric wheel design if it exceeds 1500ml
When, it may appear that the situation that grind size is uneven, fineness is inadequate, do not reach requirement of experiment, influence subsequent analysis test；If will
The volume of grinding box, the achievable 50ml of minimum grinding can be changed by realizing the grinding of low capacity；Eccentric wheel quality be 12 ±
3kg, the change of the distance of center to center again can be realized by changing the shape of eccentric wheel, such as by changing eccentric wheel angle
Increase the distance of eccentric wheel weight center to center with height.
As shown in Fig. 2 pressing device includes bellows cylinder, curved boom, rotary shaft, bearing.Bellows cylinder is consolidated with curved boom one end
Fixed, the curved boom other end is fixed with rotary shaft, and rotary shaft is arranged in the bearing of fixing end, fixing end installation rotary limit device,
Stopping means attracts curved boom, in station position, to prevent curved boom from freely swinging by perforate inserted magnet.Station includes compressing
Station and loosen station, curved boom is limited in when compressing station, and bellows cylinder be located at grinding assembly top, passes through air compressor
Gas is filled with air bag, air bag produces enough pressure compaction grinding boxes, prevents from leaking powder or gas leakage in process of lapping.Curved boom is horizontal
It is rotated by 90 ° and loosens station, is easy to dress to take grinding box.The grinding box grinding tool side of covering sets heat insulating mattress, and heat insulating mattress opens positioning hole, with
Keeper on bellows cylinder coordinates, and prevents that curved boom slides when equipment from running.
As shown in figure 3, sheet metal component housing uses split-type structural, including upper cover part and support section, upper cover part to adopt
Designed with Rouno Cormer Pregrinding Wheel camber line, overall appearance is generous.Support section installs shockproof lower margin and universal caster wheel, has both ensured equipment movement side
Just, stabilization during equipment operation is ensured again.Metal plate while it is upper have two while contact with support, pass through different sealing strips carry out it is double-deck
Sealing, Sound-proof material are arranged at case inside, and covering case inside surface, when vibration equipment produces noise, sound wave passes to Sound-proof material
When, because Sound-proof material has stringy texture, when sound wave passes through Sound-proof material by the reflecting of countless fibers, mutually superimposed, collision, sound
Wave energy is converted into heat energy, so that intensity of acoustic wave weakens or even sound disappears.Metal plate sealing uses double-layer seal, also plays
Reduce the effect of vibrating noise.Sound-proof material plays the effect for reducing vibrating noise with sealing strip jointly.
The preferable freeze grinding system of the utility model includes liquid nitrogen container, pipeline, 2/2-way magnetic valve, TEMP
Device and refrigeration grinding machine, as shown in Figure 4.Refrigeration grinding machine spacer both ends are connected to pipeline by polytetrafluoroethylhelix helix tube, protect
The connection of low temperature shock state lower pipeline is demonstrate,proved, polytetrafluoroethylhelix helix tube is as shown in Figure 5.When magnetic valve is opened, temperature passes liquid nitrogen
Sensor 1, which is used to monitor, judges whether liquid nitrogen is normally passed through spacer interlayer, so as to prompt operating personnel's refrigeration system normal operation, when
When system reaches setting precooling temperature, the signal fed back by temperature sensor 2 controls closed electromagnetic valve, to prevent liquid nitrogen stream from going out
Waste.When cooling system goes back up to certain temperature, temperature sensor 2 controls magnetic valve to open to reach lasting cooling again
Purpose.
The automatic control system of the utility model design can be including pneumatic to being controlled freeze grinding system comprehensively
Compression module, system precooling module, operation grinding module, gas discharge module etc..Operational flow diagram is as shown in Figure 6.
Pneumatic clamping is filled with gas by solenoid valve control and compressed, and can be controlled according to air compressor control pressure
Pressure caused by cylinder.When not compressed etc. equipment, system, which obtains signal control device, to be rotated.Wherein pneumatic parameter can root
Set according to below equation：
Liquid nitrogen container fluid pressure is P, so the cooling sandwith layer maximum pressure between spacer and grind box is also P, according to formula
Interlayer can be calculated is to maximum pressure caused by grind box：
F=PS
Wherein：
P- interlayer maximum pressures
The effective area of S- pressure effect
The theoretical minimum pressure of so air bag is：
FPressure=F-MMillg
Wherein：
F- interlayers are to maximum pressure caused by grind box
MMill- grind box and grinding tool and the gross mass for treating abrasive material
In order to prevent the gas of liquid nitrogen gasification from leaking, it is δ to set anti-leak coefficient, then actual minimum pressure is：
FIt is real=δ FPressureWherein δ >=2
By the above parameter in setting system, the gas pressure in bellows cylinder is controlled to compress grind box, this practicality is newly
The preferable pressure liquid nitrogen container fluid pressure P of type is 0.15MPA.
System precooling can design temperature scope and pre-coo time as needed, magnetic valve is by setting in whole process of lapping
Fixed temperature range automatic control of opening/closing, play a part of saving liquid nitrogen.Grinding can be different according to different material settings
Rotating speed and milling time.Magnetic valve opening and closing can be individually controlled to carry out the discharge of gas after the completion of grinding.Whole control system
System can be set in advance, need not carry out manual operation after operation again.When liquid nitrogen container liquid nitrogen reserves are not enough to maintenance system
When, alarm occurs in equipment, out of service.
Embodiment 1 carries out -170 DEG C of grinding experiments
Grind candied date food 500g.Product dimensions：10-20mm；Grind box volume：1200ml；Grinding assembly quality：16kg；
Spacer material：Polytetrafluoroethylene (PTFE)；Eccentric wheel quality：11kg；Helix tube material：Polytetrafluoroethylene (PTFE), refrigerant：Liquid nitrogen；Freezing
Time 40min, grinding rate 1300r/min, the product size that grinding 2min is obtained：≤0.01mm.
Embodiment 2 carries out -170 DEG C of grinding experiments
Grind rice dumpling 500ml.Product dimensions：10-20mm；Grind box volume：1300ml；Grinding assembly quality：16.5kg；Every
Cover material：Polytetrafluoroethylene (PTFE), eccentric wheel quality：12kg；Helix tube material：Polytetrafluoroethylene (PTFE), refrigerant：Liquid nitrogen；During freezing
Between 20min, grinding rate 1350r/min；The product size that grinding 2min is obtained：≤0.01mm.
Embodiment 3 carries out -100 DEG C of grinding experiments
Grind jujube folder walnut 2kg.Product dimensions：10-20mm, grind box volume：3000ml；Grinding assembly quality：19kg；Every
Cover material：Polytetrafluoroethylene (PTFE)；Eccentric wheel quality：16kg；Helix tube material：Polytetrafluoroethylene (PTFE)；Refrigerant：Liquid nitrogen；During freezing
Between 20min, grind 2min, grinding rate 1300r/min, obtain the size of product：≤0.07mm.
By embodiment 1- embodiments 3 as can be seen that refrigeration grinding machine grinding temperature of the present utility model can be reduced to-
170 DEG C, the material quantity of grinding greatly improves, and grinding efficiency is high, also can obtain after 2min grindings for toughness raw material
Small particle product.
Claims (10)
1. refrigeration grinding machine, it is characterised in that including vibro-grinding device and pressing device, vibro-grinding device includes grinding group
Part, vibration component and support component, grinding assembly include pressure roller, grind box and spacer, and pressing device compresses or loosened grinding assembly,
Grinding assembly is connected with vibration component, and grinding assembly and vibration component are arranged in support component.
2. refrigeration grinding machine according to claim 1, wherein, the pressure roller is located in grind box, and grind box is located in spacer, every
Set sets into hole and portalled.
3. refrigeration grinding machine according to claim 1, wherein, the support component includes supporting plate, pedestal and base, base
Above the base, supporting plate be located above pedestal seat, and grinding assembly is arranged on above supporting plate, grinding assembly and supporting plate it
Between heat insulating mattress is set.
4. refrigeration grinding machine according to claim 1, wherein, the vibration component includes motor and eccentric wheel, eccentric wheel
Below supporting plate.
5. refrigeration grinding machine according to claim 1, wherein, the vibro-grinding device include compression spring and according to
The extension spring and/or beam needed.
6. refrigeration grinding machine according to claim 5, wherein, the compression spring is divided between pedestal and supporting plate
For cloth on the outside of motor, the extension spring is horizontally mounted the adjacent compression spring of connection, the beam be located at pedestal and base it
Between.
7. refrigeration grinding machine according to claim 1, wherein, pressing device includes compression end, curved boom and fixing end, compresses
Bellows cylinder is selected at end, and bellows cylinder is fixed with curved boom one end, and the curved boom other end is fixed with rotary shaft, and rotary shaft is arranged on fixation
In the bearing at end, fixing end is fixed on the supporting plate.
8. refrigeration grinding machine according to claim 7, wherein the fixing end installs stopping means, stopping means is by opening
Hole inserted magnet, curved boom is attracted in station position.
9. refrigeration grinding machine according to claim 1, wherein, heat insulating mattress is set above the grinding assembly.
10. refrigeration grinding machine according to claim 9, wherein, heat insulating mattress opens positioning hole, and bellows cylinder sets keeper, fixed
Position hole coordinates with keeper.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107350026A (en) * | 2017-08-16 | 2017-11-17 | 瑞绅葆分析技术（上海）有限公司 | Automatically control continuous refrigeration grinding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107350026A (en) * | 2017-08-16 | 2017-11-17 | 瑞绅葆分析技术（上海）有限公司 | Automatically control continuous refrigeration grinding machine |
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