CN103604733B - The method of dust atmosphere analogue means and demarcation dust concentration tester thereof - Google Patents
The method of dust atmosphere analogue means and demarcation dust concentration tester thereof Download PDFInfo
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- CN103604733B CN103604733B CN201310633801.7A CN201310633801A CN103604733B CN 103604733 B CN103604733 B CN 103604733B CN 201310633801 A CN201310633801 A CN 201310633801A CN 103604733 B CN103604733 B CN 103604733B
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Abstract
The invention discloses a kind of dust atmosphere analogue means and the method utilizing this device normalization dust concentration tester, comprise Dust generator, simulation chamber and test bearing, simulation chamber comprises the mixing section of the column casing shape be from top to bottom communicated with, enriching section, the diffuser of lower end enlarging, the test section of column casing shape of lower end closing in; The bottom of test section is provided with air outlet; The dust mouth of Dust generator is communicated with mixing section; Test bearing is installed in test section, and this test bearing is positioned in same level and is provided with at least two placement stations, this test section is provided with observation door to be opened/closed, air inlet is communicated with air feed blower fan or air outlet connects blower fan of bleeding.This dust atmosphere analogue means utilizes the simulation chamber vertically arranged to be mixed with air-flow by dust, concentrate, spread, dust is made to be uniformly distributed in test section in the mode of free-falling, make to be in test section concentration deviation on same level position to reduce, the accuracy that dust concentration tester is demarcated can be improved.
Description
Technical field
The present invention relates to a kind of dust atmosphere analogue means, for simulating dust environment, the present invention relates to a kind of method utilizing this dust atmosphere analogue means to carry out demarcating dust concentration tester simultaneously.
Background technology
Environment simulation technique is a new marginal technology, the imageneering technology of the various physical environment of main research and the experimental technique of product under simulated environment; Ground environment analog machine mainly contains following a few class: low temperature environment simulation, hot environment simulation, hygrothermal environment simulation, solar irradiation simulation, sand dust environmental simulation, rain environmental simulation, dipping simulation, sour environment simulation, the simulation of explosive atmospheric environment, accumulated ice/sleet environmental simulation and mould environmental simulation etc.Some environment are once the environment reliability test, accuracy correction or long duration test etc. that can carry out product interior after simulation out.What so generally adopt for the device of dust atmosphere simulation is the horizontal wind-tunnel of level, negative pressure is utilized to make wind-tunnel produce air flowing, and wind-tunnel connects a Dust generator, dust enters in wind-tunnel after producing and forms dust simulated environment, and this dust simulated environment can be demarcated dust concentration tester.Said structure has following defect:
1. above-mentioned dust simulated environment is only adapted to the larger dust atmosphere simulation of concentration, and is not suitable for the dust simulation of low concentration, and particularly dust concentration requires 0.01 ~ 20mg/m
3: it is even at wind-tunnel that its reason wants micro-dust, wind speed just can not be fast, and the too slow dust of wind speed can slowly be deposited on the Lower Half of wind-tunnel due to the gravity of self, cause the concentration in the same cross section of wind-tunnel inconsistent, the accuracy of the demarcation of dust concentration tester will be affected like this.
2. in above-mentioned dust simulated environment, the homogeneity of dust concentration is very difficult to ensure card; Because in wind-tunnel, the flow direction of air is horizontal direction, dust so in wind-tunnel is at the air of the horizontal flow received to the gravity of its horizontal force applied and vertical direction, and what so dust received makes a concerted effort dust is very likely deposited to wind-tunnel lower portion when speed air flow is slower;
3. the Dust generator in above-mentioned dust simulated environment is the dust utilizing tape transport discrete, then utilizes hairbrush to be kicked up by dust and is blown in wind-tunnel, and the dust that this Dust generator is only applicable to high concentration produces.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of dust atmosphere analogue means, this dust atmosphere analogue means utilizes the simulation chamber vertically arranged to be mixed with air-flow by dust, concentrate, spread, dust is made to be evenly distributed in the test section of simulation chamber in the mode of free-falling, make to be in test section concentration deviation on same level position to reduce, and then the accuracy of dust concentration tester demarcation can be improved.
Another technical matters to be solved by this invention is in addition: provide a kind of method utilizing above-mentioned dust atmosphere analogue means to carry out demarcating dust concentration tester, the method can improve the accuracy of dust concentration tester calibration result greatly.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of dust atmosphere analogue means, comprise Dust generator, simulation chamber and test bearing, described simulation chamber from top to bottom comprises the mixing section of column casing shape, enriching section, the diffuser of lower end enlarging, the test section of column casing shape of lower end closing in; Described mixing section, enriching section, diffuser, test section are vertically communicated with in turn, and described mixing section is provided with air inlet, and the bottom of described test section is provided with air outlet; The dust mouth of described Dust generator is communicated with mixing section; Described test bearing is installed in test section, and this test bearing is positioned in same level and is provided with at least two placement stations, this test section is provided with observation door to be opened/closed, described air inlet is communicated with air feed blower fan or air outlet connects blower fan of bleeding.
As the preferred scheme of one, described Dust generator comprises base, dispersing chamber, powder block conveying device, dust diverting device, described dispersing chamber is arranged on base, and this dispersing chamber is provided with air inlet and dust mouth, and the bottom of dispersing chamber is provided with powder block entrance; Described powder block conveying device comprises the vertical barrel be installed on bottom dispersing chamber, and the inner chamber of this barrel is communicated with dispersing chamber by powder block entrance, is provided with piston in described barrel, and this piston and the piston driver be fixed on base drive; Described dust diverting device comprises dispersion brush and dispersion brush drive unit, and this dispersion brush horizontally rotates and is installed in dispersing chamber, and this dispersion brush drive unit to be fixed on base and to drive the uniform rotation of dispersion brush.
As the preferred scheme of one, described piston driver comprises drive motor, speed reduction unit, screw-nut body, the leading screw of described screw-nut body vertically rotates and is installed on base, vertically align with piston in the upper end of this leading screw, the nut rotation of this screw-nut body is installed on base, drive motor and speed reduction unit are installed on base, output shaft and the reducer input shaft of drive motor are in transmission connection, reducer output shaft and nut are in transmission connection, described base is installed on vertical spacing guide rod, described leading screw is installed with positioning disk, this positioning disk is provided with and coordinates with vertical spacing guide rod the limiting section limiting screw turns.
As the preferred scheme of one, described vertical spacing guide rod is detachably installed on base, described base is provided with the upper hole and lower opening of being convenient to vertical spacing guide rod plug-in mounting, described vertical spacing guide rod vertically runs through hole and lower opening, the bottom of described vertical spacing guide rod is provided with multidiameter portion, and this multidiameter portion is plugged in lower opening.
As the preferred scheme of one, described test bearing vertically rotates and is installed in test section, and this test bearing is connected with rotary power unit.
As the preferred scheme of one, the air intake direction of described air inlet and the inwall of mixing section tangent.
After have employed technique scheme, effect of the present invention is: because this simulation chamber is vertical setting, thus the speed of air flowing can control very little, and dust still can rely on the mode of free setting to fall, as long as so just guarantee that dust is uniformly dispersed; And simulate chamber there is mixing section, enriching section and diffuser, dust enters into enriching section in mixing chamber with after the air-flow premixed entered, close up and make dust and air through enriching section end opening smaller volume in the lower end of enriching section, concentration improves, and homogeneity also improves; And then volume increases after diffuser, dust disperses, thus further improve homogeneity, like this, in the same level entering into test section, dust concentration is just basically identical, concentration deviation is smaller, like this, by dust concentration tester to be calibrated, when filter membrane method standard sample instrument or dust sampling reference measure instrument are placed in same level, dust concentration tester to be calibrated, filter membrane method standard sample instrument or the actual concentrations residing for dust sampling reference measure instrument are consistent, as long as compare and measure the detection accuracy that value can compare demarcation dust concentration tester.This dust atmosphere analogue means is very suitable for the dust atmosphere simulation of low concentration.
Again because described Dust generator comprises base, dispersing chamber, powder block conveying device, dust diverting device, described dispersing chamber is arranged on base, and this dispersing chamber is provided with air inlet and dust mouth, and the bottom of dispersing chamber is provided with powder block entrance, described powder block conveying device comprises the vertical barrel be installed on bottom dispersing chamber, and the inner chamber of this barrel is communicated with dispersing chamber by powder block entrance, is provided with piston in described barrel, and this piston and the piston driver be fixed on base drive, described dust diverting device comprises dispersion brush and dispersion brush drive unit, this dispersion brush horizontally rotates and is installed in dispersing chamber, this dispersion brush drive unit to be fixed on base and to drive the uniform rotation of dispersion brush, therefore, powder block conveying device is adopted to carry in this Dust generator, dispersion brush brushes out dust with powder block end contact, compare current loose powder lot feeding, produce concentration stable and uniform more, air-flow in dispersing chamber can not produce any impact to powder block, thus achieve to need how many dust, dispersion brush accurately brush is how many, and can be applicable to producing micro-dust, make generation Dust Capacity more accurate, the stabilization of speed of this Dust generator dispersion brush is controlled, the conveying that moves up of piston is controlled, so make powder block contact consistency of thickness with in the unit interval of disperseing to brush, thus the output Dust Capacity in the unit interval can accurately control.
Again because described vertical spacing guide rod is detachably installed on base, described base is provided with the upper hole and lower opening of being convenient to vertical spacing guide rod plug-in mounting, described vertical spacing guide rod vertically runs through hole and lower opening, the bottom of described vertical spacing guide rod is provided with multidiameter portion, this multidiameter portion is plugged in lower opening, therefore, the speed moved up due to leading screw is very low, therefore the rotating speed that rotated by speed reduction unit drive nut of drive motor is very little, after powder block so in barrel is finished, leading screw is needed to retreat downwards, even if now drive motor energetic start up is to maximum, the reset of leading screw also may need several hours even for more time, now, drive motor can be stopped, vertical spacing guide rod is extracted out and is separated with positioning disk, like this, leading screw rotates freely whereabouts under the drive of himself gravity and positioning disk gravity, thus reset can be completed fast, save time.
Be installed in test section because described test bearing vertically rotates again, this test bearing is connected with rotary power unit, like this, dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument can rotate in same level with test bearing, thus improve the accuracy measured further.Certainly, speed is low as far as possible rotatably for this, in order to avoid produce turbulent flow.
Utilize the simulating dust environment of above-mentioned dust atmosphere analogue means to demarcate a method for dust concentration tester, it comprises the following steps:
A. by dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument are placed on two of being in same level respectively and place on station;
B. be continuously the simulation chamber air-flow that provides one from top to bottom to flow, the flow velocity of this air-flow be (0-0.2m/s];
C. Dust generator dust is evenly input to simulation chamber mixing section in mix with air-flow;
D. be mixed with dust air from top to bottom to concentrate through the enriching section of simulation chamber successively, be dispersed in after the diffusion of diffuser in test section, then discharge from air outlet;
E. every the detection numerical value of T time segment record dust concentration tester to be calibrated and dust sampling reference measure instrument numerical value once, this T > 2h;
F. by formula
calculate the error of indication of detector to be calibrated;
In formula: δ-error of indication, %;
ρ
1the detection display mean value of-dust concentration tester to be calibrated, unit: mg/m
3;
ρ
0-dust sampling reference measure instrument is measured mean value or filter membrane method standard sample instrument and to be weighed calculating gained, unit: mg/m
3.
If δ is not in specialized range, dust concentration tester to be calibrated is defective, if δ is again in specialized range, dust concentration tester to be calibrated is qualified.The method is simple to operate, and result is accurate.
In addition, in this step C, the even input of Dust generator realizes in the following manner:
C1. particle diameter is shortened into powder block in the precompressed of 100-200 object dried dust;
C2. powder block is put in Dust generator;
C3. the dispersion brush uniform rotation in dispersing chamber, and in dispersing chamber, pass into the pressurized air of constant flow rate;
C4. powder block is at the uniform velocity promoted to brush to contact with dispersion to produce dust.
The even input mode of this dust utilizes dispersion to brush the mode contacted with powder block and the dust of powder block end face is scraped input dust, and the dust being applicable to very much low concentration produces.
Equally, described dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument rotate in same level by testing bearing drive, speed of rotation be (0-1] R/M, the mode rotated is utilized to measure, so can reduce the error that the dust concentration difference in same level is brought, make dust concentration tester to be calibrated, the residing test dust concentration environment of filter membrane method standard sample instrument or dust sampling reference measure instrument is consistent.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the vertical view of the test bearing of the embodiment of the present invention;
Fig. 3 is the structural representation of the Dust generator of the embodiment of the present invention;
In accompanying drawing: 1. simulate chamber; 11. mixing sections; 12. enriching sections; 13. diffusers; 14. test sections; 2. Dust generator; 201. base; 202. dispersing chamber; 203. dispersion brushes; 204. barrel; 205. piston; 206. powder blocks; 207. dispersion brush motors; 208. drive motor; 209. speed reduction unit; 210. active synchronization wheels; 211. driven synchronizing wheels; 212. leading screw; 213. nut; 214. positioning disk; 215. vertical spacing guide rods; 3. dust concentration tester to be calibrated; 4. dust sampling reference measure instrument; 5. observe door; 6. test bearing; 7. electric control gear.
Embodiment
Below by specific embodiment, the present invention is described in further detail.
As shown in Figure 1, 2, 3, a kind of dust atmosphere analogue means, comprise Dust generator 2, simulation chamber 1 and test bearing 6, described simulation chamber 1 from top to bottom comprises the mixing section 11 of column casing shape, enriching section 12, the diffuser 13 of lower end enlarging, the test section 14 of column casing shape of lower end closing in; Described mixing section 11, enriching section 12, diffuser 13, test section 14 are vertically communicated with in turn, close up in enriching section 12 lower end, and thus upper end relative aperture lower end bore is large, and make cubic deformation like this, dust concentrates, and change the horizontal distribution situation of dust; Described mixing section 11 is provided with air inlet, the air intake direction of described air inlet and the inwall of mixing section 11 tangent.The bottom of described test section 14 is provided with air outlet; Described air inlet is communicated with air feed blower fan or air outlet connects blower fan of bleeding.This induced draft fans or air feed blower fan are all for simulation chamber 1 provides air-flow, and in order to ensure the accuracy of concentration inside, can arrange screen pack in air inlet.
The dust mouth of described Dust generator 2 is communicated with mixing section 11; This dust mouth to go out dirt direction relative with the air intake direction of air inlet, mix dust can be made so more even.Described test bearing 6 is installed in test section 14, this test bearing 6 is positioned in same level and is provided with at least two placement stations, place on station for these two and be placed with dust concentration tester 3 to be calibrated and dust sampling reference measure instrument 4 respectively, wherein test bearing 6 to fix with test section 14, the structure vertically rotated can also be made, test bearing 6 vertically rotates and is installed in test section 14, this test bearing 6 is connected with rotary power unit, the rotational speed of rotary support is very little, to avoid turbulent flow.This test section 14 is provided with observation door 5 to be opened/closed, and this observation door 5 can be opened and place dust concentration tester 3 to be calibrated, also observable inner case.
This analogue means is also provided with electric control gear 7, and it comprises the control section controlling blower fan and Dust generator 2 action and the display screen showing dust concentration tester 3 to be calibrated, dust sampling reference measure instrument 4 numerical value;
Described Dust generator 2, comprise base 201, dispersing chamber 202, powder block 206 conveying device, dust diverting device, this base 201 comprises the lower bottom base and superposed upper bed-plate that are positioned at bottom, described dispersing chamber 202 is arranged on base 201, specifically be fixed on upper bed-plate, this dispersing chamber 202 is provided with air inlet and dust mouth, and this dust mouth is preferably horizontality, and the bottom of dispersing chamber 202 is provided with powder block 206 entrance; Described powder block 206 conveying device comprises the vertical barrel 204 be installed on bottom dispersing chamber 202, the inner chamber of this barrel 204 is communicated with dispersing chamber 202 by powder block 206 entrance, be provided with piston 205 in described barrel 204, this piston 205 drives with piston 205 drive unit be fixed on base 201; Be tucked in the inner chamber of barrel 204 by the powder block 206 of pre-pressing during use, wherein, barrel 204 is cylindric, and thus this powder block 206 is also cylindric and adaptive with inner chamber size; Described powder block 206 is dry coal dusts after filtering with 200 order sieves, talcum powder or other suitable powder dust particle precompression form.
Described dust diverting device comprises dispersion brush 203 and dispersion brush 203 drive unit, and this dispersion brush 203 horizontally rotates and is installed in dispersing chamber 202, and this dispersion brush 203 drive unit to be fixed on base 201 and to drive the uniform rotation of dispersion brush 203.This dispersion brush 203 drive unit is a dispersion brush motor 207, and this dispersion brush motor 207 is horizontally disposed with and is connected with the central shaft driven of dispersion brush 203.
Described piston 205 drive unit comprises drive motor 208, speed reduction unit 209, screw-nut body, the leading screw 212 of described screw-nut body vertically rotates and is installed on base 201, vertically align with piston 205 in the upper end of this leading screw 212, the upper end of leading screw 212 can pushing tow piston 205, the nut 213 of this screw-nut body rotates and is installed on base 201, drive motor 208 and speed reduction unit 209 are installed on base 201, specifically install on lower bottom base, output shaft and speed reduction unit 209 input shaft of drive motor 208 are in transmission connection, speed reduction unit 209 output shaft and nut 213 are in transmission connection, its concrete kind of drive is: described speed reduction unit 209 output shaft is provided with active synchronization wheel 210, base 201 is rotatablely equipped with driven synchronizing wheel 211, described nut 213 is fixed on driven synchronizing wheel 211 with one heart, Timing Belt is provided with between described active synchronization wheel 210 and driven synchronizing wheel 211.Driven synchronizing wheel 211 rotates and is installed on base 201 and is enclosed within leading screw 212, and lower surface and the nut 213 of driven synchronizing wheel 211 are fixed.This nut 213 is a swivel nut, and this swivel nut is threaded with leading screw 212 and rotates and is installed on base 201, and the upper-lower position of swivel nut is retrained by base 201.
Described base 201 is installed on vertical spacing guide rod 215, described leading screw 212 is installed with positioning disk 214, this positioning disk 214 is provided with and coordinates with vertical spacing guide rod 215 limiting section limiting leading screw 212 and rotate.Described limiting section is the stopper slot of open loop, the number of this stopper slot be multiple and circumference uniform distribution on positioning disk 214, described vertical spacing guide rod 215 is in one of them stopper slot.Like this, when drive motor 208 drives nut 213 to rotate, the positioning disk 214 on leading screw 212 is limited by vertical spacing guide rod 215, thus leading screw 212 cannot rotate with nut 213, can only vertically movement.This stopper slot also can substitute with spacing hole.
Wherein, described vertical spacing guide rod 215 is detachably installed on base 201, described base 201 is provided with the upper hole and lower opening of being convenient to vertical spacing guide rod 215 plug-in mounting, on this, hole and lower opening are all arranged on lower bottom base, and vertically aim at, described vertical spacing guide rod 215 vertically runs through hole and lower opening, and the bottom of described vertical spacing guide rod 215 is provided with multidiameter portion, and this multidiameter portion is plugged in lower opening.
In addition, the invention also discloses a kind of method utilizing the simulating dust environment of above-mentioned dust atmosphere analogue means to demarcate dust concentration tester, it comprises the following steps:
A. by dust concentration tester 3 to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument 4 are placed on two of being in same level respectively and place on station; This dust concentration tester 3 to be calibrated is connected with electric control gear 7, and display screen can real-time display device test concentrations; The above-mentioned filter membrane method standard sample instrument utilization dust dropped on filter membrane can be calculated concentration value after putting into and high-precision weighing instrument being weighed.
B. the air-flow that simulation chamber 1 provides from top to bottom to flow is continuously, the flow velocity of this air-flow be (0-0.2m/s], wherein, there is provided the mode of air-flow that malleation can be adopted to supply gas or the mode of negative inspiratory pressure, the air entered in simulation chamber 1 need be pure air, to guarantee that measurement of concetration is accurate;
C. mix with air-flow in the mixing section 11 that dust is evenly input to simulation chamber 1 by Dust generator 2;
D. be mixed with dust air from top to bottom to concentrate through the enriching section 12 of simulation chamber 1 successively, be dispersed in test section 14 after the diffusion of diffuser 13, then discharge from air outlet, because flow velocity is very low, therefore, dust is full of whole test section 14 in the mode of proximate freedom sedimentation, and dust concentration is even;
E. every the detection numerical value of T time segment record dust concentration tester 3 to be calibrated and dust sampling reference measure instrument 4 numerical value once, this T > 2h; Record number of times can be determined as required; And in these record number of times, several concentration point can be chosen in the sensing range of dust concentration tester 3 to be calibrated and test, thus determine that this dust concentration tester undetermined measures the accuracy of numerical value further accurately.
F. by formula
calculate the error of indication of detector to be calibrated;
In formula: δ-error of indication, %;
ρ
1the detection display mean value of-dust concentration tester 3 to be calibrated, unit: mg/m
3;
ρ
0-dust sampling reference measure instrument 4 is measured mean value or filter membrane method standard sample instrument and to be weighed calculating gained, unit: mg/m
3.
If δ is not in specialized range, dust concentration tester 3 to be calibrated is defective, if δ is again in specialized range, dust concentration tester 3 to be calibrated is qualified.The method is simple to operate, and result is accurate.
In addition, in this step C, the even input of Dust generator 2 realizes in the following manner:
This Dust generator 2 utilizes the dispersion brush 203 of uniform rotation and the powder block 206 of the at the uniform velocity drying of feed
C1. particle diameter is shortened into powder block 206 in the precompressed of 100-200 object dried dust;
C2. powder block 206 is put in Dust generator 2;
C3. dispersion brush 203 uniform rotation in dispersing chamber 202, and in dispersing chamber 202, pass into the pressurized air of constant flow rate;
C4. powder block 206 is at the uniform velocity promoted to contact generation dust with dispersion brush 203.
The dust of powder block 206 end face is scraped input by the mode that the even input mode of this dust utilizes dispersion brush 203 to contact with powder block 206, and the dust being applicable to very much low concentration produces.
Equally, described dust concentration tester to be calibrated 3, filter membrane method standard sample instrument or dust sampling reference measure instrument 4 are preferably driven by test bearing 6 and rotate in same level, speed of rotation be (0-1] R/M, the mode rotated is utilized to measure, the error that the dust concentration difference in same level is brought can be reduced, make dust concentration tester 3 to be calibrated consistent with the residing test dust concentration environment of dust sampling reference measure instrument 4.
Claims (9)
1. a dust atmosphere analogue means, comprise Dust generator, simulation chamber and test bearing, it is characterized in that: described simulation chamber from top to bottom comprises the mixing section of column casing shape, enriching section, the diffuser of lower end enlarging, the test section of column casing shape of lower end closing in; Described mixing section, enriching section, diffuser, test section are vertically communicated with in turn, and described mixing section is provided with air inlet, and the bottom of described test section is provided with air outlet; The dust mouth of described Dust generator is communicated with mixing section; Described test bearing is installed in test section, and this test bearing is positioned in same level and is provided with at least two placement stations, this test section is provided with observation door to be opened/closed, described air inlet is communicated with air feed blower fan or air outlet connects blower fan of bleeding.
2. a kind of dust atmosphere analogue means as claimed in claim 1, it is characterized in that: described Dust generator comprises base, dispersing chamber, powder block conveying device, dust diverting device, described dispersing chamber is arranged on base, this dispersing chamber is provided with air inlet and dust mouth, and the bottom of dispersing chamber is provided with powder block entrance; Described powder block conveying device comprises the vertical barrel be installed on bottom dispersing chamber, and the inner chamber of this barrel is communicated with dispersing chamber by powder block entrance, is provided with piston in described barrel, and this piston and the piston driver be fixed on base drive; Described dust diverting device comprises dispersion brush and dispersion brush drive unit, and this dispersion brush horizontally rotates and is installed in dispersing chamber, and this dispersion brush drive unit to be fixed on base and to drive the uniform rotation of dispersion brush.
3. a kind of dust atmosphere analogue means as claimed in claim 2, it is characterized in that: described piston driver comprises drive motor, speed reduction unit, screw-nut body, the leading screw of described screw-nut body vertically rotates and is installed on base, vertically align with piston in the upper end of this leading screw, the nut rotation of this screw-nut body is installed on base, drive motor and speed reduction unit are installed on base, output shaft and the reducer input shaft of drive motor are in transmission connection, reducer output shaft and nut are in transmission connection, described base is installed on vertical spacing guide rod, described leading screw is installed with positioning disk, this positioning disk is provided with and coordinates with vertical spacing guide rod the limiting section limiting screw turns.
4. a kind of dust atmosphere analogue means as claimed in claim 3, it is characterized in that: described vertical spacing guide rod is detachably installed on base, described base is provided with the upper hole and lower opening of being convenient to vertical spacing guide rod plug-in mounting, described vertical spacing guide rod vertically runs through hole and lower opening, the bottom of described vertical spacing guide rod is provided with multidiameter portion, and this multidiameter portion is plugged in lower opening.
5. a kind of dust atmosphere analogue means as described in any one of Claims 1-4, is characterized in that: described test bearing vertically rotates and is installed in test section, and this test bearing is connected with rotary power unit.
6. a kind of dust atmosphere analogue means as claimed in claim 5, is characterized in that: the air intake direction of described air inlet and the inwall of mixing section tangent.
7. utilize the simulating dust environment of dust atmosphere analogue means in claim 1 to demarcate a method for dust concentration tester, it comprises the following steps:
A. by dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument are placed on two of being in same level respectively and place on station;
B. be continuously the simulation chamber air-flow that provides one from top to bottom to flow, the flow velocity of this air-flow be (0-0.2m/s];
C. Dust generator dust is evenly input to simulation chamber mixing section in mix with air-flow;
D. be mixed with dust air from top to bottom to concentrate through the enriching section of simulation chamber successively, be dispersed in after the diffusion of diffuser in test section, then discharge from air outlet;
E. dust weight is weighed once, this T > 2h every the detection numerical value of T time segment record dust concentration tester to be calibrated and dust sampling reference measure instrument numerical value or filter membrane method standard sample instrument;
F. by formula
calculate the error of indication of detector to be calibrated;
In formula: δ-error of indication, %;
ρ
1the detection display mean value of-dust concentration tester to be calibrated, unit: mg/m
3;
ρ
0-dust sampling reference measure instrument is measured mean value or filter membrane method standard sample instrument and to be weighed calculating gained, unit: mg/m
3,
If δ is not in specialized range, dust concentration tester to be calibrated is defective, if δ is again in specialized range, dust concentration tester to be calibrated is qualified.
8. the method for dust atmosphere simulated calibration dust concentration tester as described in claim 7, is characterized in that: in this step C, the even input of Dust generator realizes in the following manner:
C1. particle diameter is shortened into powder block in the precompressed of 100-200 object dried dust;
C2. powder block is put in Dust generator;
C3. the dispersion brush uniform rotation in dispersing chamber, and in dispersing chamber, pass into the pressurized air of constant flow rate;
C4. powder block is at the uniform velocity promoted to brush to contact with dispersion to produce dust.
9. the method for dust atmosphere simulated calibration dust concentration tester as described in claim 8, it is characterized in that: described dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument drive rotate in same level by testing bearing, speed of rotation be (0-1] R/M.
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