CN101845961B - Bracket spraying dust reduction emulation device for coal mine working surface - Google Patents
Bracket spraying dust reduction emulation device for coal mine working surface Download PDFInfo
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Abstract
The invention discloses a bracket spraying dust reduction emulation simulation device for a coal mine working surface. The device comprises an emulation enclosed test box. The front end of the emulation enclosed test box is provided with an air inlet while the back end is provided with an air outlet; an air flow power supplying device, a dust generating device, a spraying device and a detection system are arranged in the emulation enclosed test box, wherein the air flow power supplying device is used for simulating the air speed and the pressure condition of the coal mine working surface and is arranged at the water inlet; the dust generating device is used for simulating the dust generating state of the coal mine working surface and is arranged on the front part of the emulation enclosed test box; the spraying device is used for simulating the spraying state of a bracket nozzle on the coal mine working surface; and the spraying device and the detection system are arranged in the middle of the emulation enclosed test box respectively. The emulation enclosed test box is adopted and relevant data of the emulation enclosed test box is acquired and analyzed by using the detection system, so technical support is provided for scientific and reasonable arrangement of a nozzle on the coal mine working surface.
Description
Technical field
The present invention relates to a kind of analogue means of coal mine work area, relate in particular to a kind of bracket spraying dust reduction emulation simulation device for coal mine working surface.
Background technology
At present, China's getting working face is not having under the situation of dust prevention, and the dust concentration of fully-mechanized mining working can reach 2500-3000mg/m
3, the dust situation of fully mechanized coal face is then even more serious than general fully-mechanized mining working, coalcutter coal cutting, when moving frame and putting the coal parallel working, indivedual instantaneous original total dust concentrations in some colliery even up to 8000-10000mg/m
3Even take measures, the situation of most workplaces is still quite abominable, and the dust concentration maximum of wind direction can reach more than the 1000mg/m3 under the coalcutter, has seriously surpassed national Specification.
The general mechanization driving that adopts in the prior art, its workplace adopts the powerful cut coal of high-power roadheader, and dust-producing amount is big especially, according to field measurement, is not adopting under the synthesis dust prevention measure situation, and the dust concentration of tunneling working face is 2000-3000mg/m
3, the dust concentration of indivedual tunneling working faces even up to 6000mg/m
3About.
In order to reduce the dust concentration of coal mine work area; Reduce the harm of dust to workman and equipment; Avoid taking place the dust explosion accident, the wet type depositing dust has all been adopted in the domestic majority colliery, and the dust-laying effect of this kind mode is apparent in view; Its average dust reduction rate has surpassed 70%, has effectively improved the production environment of workplace.
Though the atomizing de-dusting nozzle kind that fully mechanized coal face uses under the coal mine is numerous, and has obtained certain dust-laying effect.But, for a long time, the situation of selecting for use of fully mechanized coal face atomizer is then mainly selected with subjectivity according to people's practical experience.Promptly take the nozzle of which kind of type just can obtain dust-laying effect preferably to the product grit degree characteristics of different production processes, only relying on person in charge's experience is the dust concentration that is difficult to the control coal mine work area actually.
Study the Practical Performance of nozzle; Must have a kind of can the real simulation workplace analogue simulation device of distinguished and admirable state, dust state and spraying situation disclose the pulverability and the dust-laying effect of different spray nozzles, for the work of colliery scene atomizing de-dusting provides theoretical direction.This shows that prior art remains further improvement and development.
Summary of the invention
The present invention provides a kind of bracket spraying dust reduction emulation simulation device for coal mine working surface for solving above-mentioned defective of the prior art; The situation of simulation coal mine work area; For the atomizing de-dusting of coal mine work area provides technical support; For improving the scientific rationality that nozzle is installed on the coal mine work area data support is provided, has practiced thrift installation cost.
For solving the problems of the technologies described above, the present invention program comprises:
A kind of bracket spraying dust reduction emulation simulation device for coal mine working surface, it comprises emulation blocking test case, and the front end of emulation blocking test case is provided with an air intake vent, and the rear end is provided with an air outlet; Be provided with in this emulation blocking test case the wind speed that is used to simulate coal mine work area, pressure condition distinguished and admirable power supplying apparatus, be used to simulate the dust generating means that the coal mine work area dust produces situation, spraying plant and the detection system that is used to simulate coal mine work area support nozzle spray situation, distinguished and admirable power supplying apparatus is arranged on air intake vent; The dust generating means is arranged on the front portion of emulation blocking test case, is positioned at the rear of air intake vent; Spraying plant and detection system are separately positioned on the middle part of emulation blocking test case.
Described bracket spraying dust reduction emulation simulation device for coal mine working surface; Wherein, Above-mentioned emulation blocking test case comprises distinguished and admirable divergent segment and experimental section; Distinguished and admirable divergent segment is positioned at the place ahead of experimental section, and air intake vent and dust generating means are separately positioned on the distinguished and admirable divergent segment, and spraying plant, detection system and air outlet are separately positioned on the experimental section.
Described bracket spraying dust reduction emulation simulation device for coal mine working surface, wherein, above-mentioned distinguished and admirable divergent segment outline is for lacking the truncated rectangular pyramids shape on base, and its height is two to select First Five-Year Plan rice, and the flaring angle of distinguished and admirable divergent segment is 22 six degree; Air intake vent is arranged on the front end of distinguished and admirable divergent segment, and air intake vent is that a diameter is 14 meter a circular port.
Described bracket spraying dust reduction emulation simulation device for coal mine working surface, wherein, above-mentioned experimental section outline is for lacking the rectangular post on base, and its length is respectively three meters, three meters, 25 meters; Air outlet is arranged on the rear end of experimental section, and it is a rectangular opening, and the length and width of air outlet is respectively three meters, 25 meters.
Described bracket spraying dust reduction emulation simulation device for coal mine working surface, wherein, it is 2804 meters reinforcing rod that above-mentioned distinguished and admirable divergent segment evenly is provided with many length; A rectangle retainer plate is all installed for 0. 688 meters in the vertical every interval of distinguished and admirable divergent segment.
Described bracket spraying dust reduction emulation simulation device for coal mine working surface; Wherein, By thickness is the emulation blocking test case that one centimetre organic glass is processed; The base plate of its experimental section is provided with 3/1000ths the gradient, and this gradient is directed downwards inclination along part to the air outlet that joins from distinguished and admirable divergent segment and experimental section.
Described bracket spraying dust reduction emulation simulation device for coal mine working surface wherein, is respectively arranged with two slideways on the top board of experimental section and the base plate, the slideway of top board is corresponding one by one up and down with the slideway of base plate; Spraying plant comprises a nozzle holder; Nozzle holder comprises two columns and a crossbeam, and column lays respectively at the two ends of crossbeam, and column is arranged between the slideway of slideway and base plate of top board; Column can move along corresponding slideway is forward and backward, and crossbeam can move along column is upper and lower.
Described bracket spraying dust reduction emulation simulation device for coal mine working surface, wherein, the middle part of above-mentioned experimental section evenly is provided with a plurality of apertures; Detection system comprises tilting micromanometer and compensate-type micropressure meter, and tilting micromanometer is connected with corresponding aperture respectively with compensate-type micropressure meter.
Described bracket spraying dust reduction emulation simulation device for coal mine working surface, wherein, above-mentioned distinguished and admirable power supplying apparatus adopts the axial fan of inorganic VFC mode.
Described bracket spraying dust reduction emulation simulation device for coal mine working surface, wherein, the outer setting of above-mentioned experimental section has split type spraying laser particle size analyzer.
A kind of bracket spraying dust reduction emulation simulation device for coal mine working surface provided by the invention; Distinguished and admirable power supplying apparatus, dust generating means, spraying plant and detection system are set in emulation blocking test case, and distinguished and admirable power supplying apparatus provides wind speed and pressure certain distinguished and admirable as requested, the distinguished and admirable distinguished and admirable divergent segment that gets into the l-G simulation test case from air intake vent; Dust generating means simulation on the distinguished and admirable divergent segment simultaneously produces the dust of some; Dust can get into the experimental section of emulation blocking test case along with wind, and the spraying plant of experimental section is equipped with the nozzle of some as required, and the experimenter can control the dosage of nozzles spray depositing dust agent; Related data in the synchronous detection system acquisition experimental section is analyzed; Last distinguished and admirablely blow out from air outlet, thus the correlated performance index of nozzle and the performance of depositing dust agent obtained, and respective nozzle being installed and spraying the depositing dust agent for coal mine work area provides technical basis; Improve the nozzle efficiency of coal mine work area, practiced thrift installation cost.In addition; L-G simulation test case of the present invention comprises distinguished and admirable divergent segment of truncated rectangular pyramids shape that is positioned at the front portion and the experimental section that is positioned at the rectangular cylindricality at rear portion; Make distinguished and admirable and dust meet the situation of coal mine work area fully; And at experimental section split type spraying laser particle size analyzer is set, detects and analyze the pulverability of different spray nozzles, for the coal mine work area depositing dust provides technical support.
Description of drawings
Fig. 1 is the structure diagram of bracket spraying dust reduction emulation simulation device for coal mine working surface among the present invention;
Fig. 2 is the structure diagram of the atomizing de-dusting experimental program of cloud coupled relation among the present invention.
Embodiment
The invention provides a kind of bracket spraying dust reduction emulation simulation device for coal mine working surface, clearer, clear and definite in order to make the object of the invention, technical scheme and advantage, below will combine accompanying drawing and embodiment, to further explain of the present invention.
The invention provides a kind of bracket spraying dust reduction emulation simulation device for coal mine working surface; Adopt emulation blocking test case; And emulation blocking test case is provided with air intake vent and air outlet, the situation of simulation coal mine work area in emulation blocking test case, the related data of collecting emulation blocking test case then through detection system; After related data analyzed; Obtain the correlated performance index of nozzle and the performance of depositing dust agent, the installation nozzle scientific and reasonable for coal mine work area provides technical support, practiced thrift installation cost.Like Fig. 1 and shown in Figure 2, bracket spraying dust reduction emulation simulation device for coal mine working surface comprises emulation blocking test case 1, and the front end of emulation blocking test case is provided with an air intake vent 2, and the rear end is provided with an air outlet 3; Be provided with in this emulation blocking test case 1 wind speed that is used to simulate coal mine work area, pressure condition distinguished and admirable power supplying apparatus 4, be used to simulate the dust generating means 5 that the coal mine work area dust produces situation, spraying plant 6 and the detection system that is used to simulate coal mine work area support nozzle spray situation, distinguished and admirable power supplying apparatus 4 is arranged on air intake vent 2 places; Dust generating means 5 is arranged on the front portion of emulation blocking test case 1, is positioned at the rear of air intake vent 2; Spraying plant 6 and detection system are separately positioned on the middle part of emulation blocking test case 1.This shows; Distinguished and admirable power supplying apparatus 4 is blown into the dust that dust generating means 5 produces in the emulation blocking test case 1; The situation of simulation coal mine work area, and spraying plant 6 sprays the depositing dust agent of respective amount, through detection system the situation in the emulation blocking test case 1 is detected; Obtain related data; Then the related data that obtains is analyzed, thereby, supported for the high-level efficiency depositing dust provides theoretical for theoretical support being provided at the scientific and reasonable installation spraying plant 6 of coal mine work area and the sprinkling amount of depositing dust agent.
In order further to set forth the present invention; As shown in Figure 2, emulation blocking test case 1 comprises distinguished and admirable divergent segment 7 and experimental section 8, distinguished and admirable divergent segment 7 is positioned at the place ahead of experimental section 8; Air intake vent 2 is separately positioned on the distinguished and admirable divergent segment 7 with dust generating means 5; Air intake vent 2 is positioned at the front end of distinguished and admirable divergent segment 7, and dust generating means 5 is positioned at the front portion of distinguished and admirable divergent segment, the dust generating means 5 general powder producers that adopt.
Spraying plant 6, detection system and air outlet 3 are separately positioned on the experimental section 8, and air outlet 3 is positioned at the rear end of experimental section 8, and detection system and spraying plant 6 are arranged on the middle part of experimental section 8.The rear end of distinguished and admirable divergent segment 7 is connected with the front end of experimental section 8; Form a vertical penetrating casing; Intend coal mine work area at this cabinet inner module and get working condition; Detect and analyze by concentration, the dispersion degree of detection system then, for the efficient depositing dust of coal mine work area provides the data support dust before and after spraying droplet granularity in the closed experimental box 1 of emulation and the atomizing de-dusting.
Further, the outline of distinguished and admirable divergent segment 7 is for lacking the truncated rectangular pyramids shape on base, and its height is two to select First Five-Year Plan rice, and the flaring angle of distinguished and admirable divergent segment 7 is 22 six degree; Air intake vent 2 is arranged on the front end of distinguished and admirable divergent segment 7, and air intake vent 2 is that a diameter is 14 meter a circular port, and the distinguished and admirable divergent segment 7 that adopts terrace with edge shape outline is in order better to simulate the situation of coal mine fully-mechanized mining face or comprehensive coal face.
Further, the outline of experimental section 8 is for lacking the rectangular post on base, and its length is respectively three meters, three meters, 25 meters; Air outlet 3 is arranged on the rear end of experimental section, and it is a rectangular opening, and the length and width of air outlet 3 is respectively three meters, 25 meters.Hence one can see that, and after distinguished and admirable divergent segment 7 joined with experimental section 8, air intake vent 2 formed certain slope naturally with air outlet 3, makes its space complete and coal mine work area is identical really, makes experimental result more targeted, and the measurements for reduction in colliery is more had directive significance.
Preferred, it is 2804 meters reinforcing rod that distinguished and admirable divergent segment 7 evenly is provided with many length; A rectangle retainer plate is all installed for 0. 688 meters in the longitudinally every interval of distinguished and admirable divergent segment 7.
Further, emulation closed experimental box 1 is to be that one centimetre organic glass is processed by thickness, and promptly distinguished and admirable divergent segment 7 all has thick one centimetre organic glass to process with experimental section 8.And the base plate of experimental section 8 is provided with 3/1000ths the gradient, and this gradient is directed downwards inclination along part to the air outlet that joins from distinguished and admirable divergent segment and experimental section, is beneficial to collection, the discharge of spray water.
Further, being respectively arranged with two slideways on the top board of experimental section 8 and the base plate, the slideway of top board is corresponding one by one up and down with the slideway of base plate; Spraying plant 6 comprises a nozzle holder; Nozzle holder comprises two columns and a crossbeam, and column lays respectively at the two ends of crossbeam, and column is arranged between the slideway of slideway and base plate of top board; Column can move along corresponding slideway is forward and backward, and crossbeam can move along column is upper and lower.Through this kind structure to measure the droplet particle size dispersion degree in different spray flow fields zone; And control is automatically all adopted in moving of column and crossbeam; Through the automatic control platform centralized management, the technology about automatic control in the prior art is ripe, gives unnecessary details no longer one by one at this.
Further, the middle part of experimental section 8 evenly is provided with a plurality of apertures; Detection system comprises tilting micromanometer 10 and compensate-type micropressure meter 11, and tilting micromanometer 10 is connected with corresponding aperture respectively with compensate-type micropressure meter 11.General employing YYT-2000 type tilting micromanometer and YJB-2500 type compensate-type micropressure meter in the prior art, and then the blast of test experience section diverse location.Detection system yet comprises many AKFC-92A type dust gauges 13; Dust is carried out artificial sample; Detect the dispersion degree of dust again through Winner99 displaing microparticle image analyzer, detect dust concentration, for the decision maker provides more accurate data through the high-precision electronic balance.
Further; The distinguished and admirable power supplying apparatus 4 general axial fans that adopt inorganic VFC mode, its rotating speed is 750r/min, the blade angle degree is 14 °; The number of blade is 10; After the wind speed in the emulation blocking test case 1 and pressure reach demand, keep the constant of wind speed, pressure, coal dust is kicked up, the situation of simulation coal mine work area through lower negative pressure, high air quantity fan blower.
Further; The outer setting of experimental section 8 has split type spraying laser particle size analyzer 9; The general split type spraying laser particle size analyzer 9 of Winner313 that adopts; Detect and analyze the pulverability of different spray nozzles, as shown in Figure 1, the Laser emission of the split type spraying laser particle size analyzer 9 of Winner313 and the line of receiving trap are perpendicular to wind direction.。
In Fig. 1 and atomizing de-dusting experimental program shown in Figure 2, it specifically comprises:
Start distinguished and admirable power supplying apparatus 4; Promptly start axial fan; Observe the reading of each tilting micromanometer 10 and compensate-type micropressure meter 11; And handle the airflow parameter of distinguished and admirable divergent segment 7 and experimental section 8, and regulate fan parameter through electrodeless frequency converter then, make emulation blocking test case 1 the inside especially airflow parameter and on-the-spot actual matching of experimental section 8.
Open spraying plant 6, the nozzle 12 on the spraying plant 6 begins spraying, in this process, passes through the pulverability that the split type spraying laser particle size analyzer 9 of Winner313 detected and analyzed nozzle.In testing process, through about the automatic control platform control nozzle holder, move left and right, can detect the pulverability of nozzle 12 when diverse location, its essence is the size distribution that detects diverse location droplet in the spray field.
Spraying plant 6 can be connected with high-pressure pump 14, for spraying plant 6 water source is provided by high-pressure pump 14, and regulates high-pressure pump 14, can detect the pulverability of nozzle 12 under different hydraulic conditions, can confirm the best pressure of supply water of suitable nozzle simultaneously.
And can change nozzle 12, and can detect the pulverability of different spray nozzles, therefrom select the best nozzle of spray effect; Regulate the parameters such as rotating speed of axial fan 4, can measure the pulverability of nozzle under different airflow parameter conditions, select the nozzle of suitable rig-site utilization.
Under the situation of the specific airflow parameter of a certain workplace of simulation; Open dust generating means 5; Promptly open powder producer, a plurality of dust gauges 13 are gathered distinguished and admirable middle dust sample, re-use the concentration of distinguished and admirable middle dust in the high-precision electronic balance test experience case; And the parameter such as pressure, dust quantity delivered of regulating powder producer 5 in view of the above, make it the dust concentration of analog operation face.
The dispersion degree of dust can be measured through Winner99 displaing microparticle image analyzer and Winner2000 dry powder laser particle size analyzer, guarantees that its dispersion degree of dust of supply powder producer 5 is suitable with face condition.
Open spraying plant 6 afterwards, regulate guide rail position and pressure of supply water, can detect spray field that nozzle 12 produced arresting efficiency dust in distinguished and admirable.
If add an amount of depositing dust agent in the current of spraying plant 6, then can detect this depositing dust agent to the improvement ability of nozzle spray field and to the raising ability of depositing dust efficient.
Different spraying hydraulic pressure can be known the analysis of dust-laying effect according to the fully mechanized coal face atomizing de-dusting time, the optimum pressure that 8.0MPa supplies water for spraying, and therefore, the spraying hydraulic pressure of invention is all unified to be 8.0MPa
Just list concrete experimental program of act at this, it may further comprise the steps:
Steps A: the different rotating speeds of adjustment blower fan; The reading of record inclination differential manometer and compensate-type micropressure meter; Distinguished and admirable parameters such as speed in ventilation resistance through calculating spray model divergent segment and steady section under the blower fan different rotating speeds, the relative static pressure at fan outlet place and the model steady section---through adjustment, can simulate the airflow parameter of workplace under the different situations.
Step B: do not start blower fan; Start the spraying water system; Change the nozzle different spatial positions one by one; Measure the size distribution situation of diverse location place droplet respectively through the split type spraying laser particle size analyzer of Winner313, obtain the dispersion degree distribution situation of whole Wu Chang space droplet again by aggregate analysis---so can detect the nozzle pulverability in the home again.
Step C: start blower fan; Under different rotating speed, change the nozzle different spatial positions one by one; Dispersivity test result according to the droplet particle diameter; Obtain the droplet dispersion degree distribution situation in space, institute mist formation field under the real conditions of the different wind speed of fully mechanized coal face under the simulation well---comparing in the pulverability of gained nozzle in subsurface environment and the common environment will be detected, the suitable ability of nozzle can be obtained.
Step D: start the airborne dust fan blower of powder producer, observe stability and homogeneity that dust falls from funnel---know that through calculating the Dust Capacity of carrying through the plastics sebific duct should be controlled at about 250g/min, guarantee the normal dust atmosphere of analog operation face.
Step e: after treating that the defeated dirt of powder producer is stable, blower fan near the rotating speed of comprehensive coal face wind speed under fixed nozzle in (1250,500) locus.Open spraying plant simultaneously, the stability of observation supply channel upward pressure table, flowmeter and high-pressure pump pressure indicator reading.
Step F: after treating powder producer and spraying plant working stability, start AKFC-92A type dust gauge simultaneously, use dispersion degree and concentration sampling head to gather dust respectively, assurance gas production flow control is adopted dirt time 2min about 20L/min.
Step G: repeat above-mentioned steps A-step F, same nozzle is fixed on diverse location experimentizes once more.
Step H: change another nozzle and repeat above-mentioned steps G then, carry out another experiment.
In sum, the invention provides a kind of bracket spraying dust reduction emulation simulation device for coal mine working surface, adopt emulation blocking test case; And emulation blocking test case is provided with air intake vent and air outlet; The situation of simulation coal mine work area in emulation blocking test case is collected the related data of emulation blocking test case then, thereby is obtained the correlated performance index of nozzle and the performance of depositing dust agent through detection system; Respective nozzle being installed and spraying the depositing dust agent for coal mine work area provides technical basis; Improved the nozzle efficiency of coal mine work area, practiced thrift installation cost, and l-G simulation test case of the present invention comprises distinguished and admirable divergent segment of truncated rectangular pyramids shape that is positioned at the front portion and the experimental section that is positioned at the rectangular cylindricality at rear portion; Make distinguished and admirable and dust meet the situation of coal mine work area fully; And at experimental section split type spraying laser particle size analyzer is set, detects and analyze the pulverability of different spray nozzles, for the coal mine work area depositing dust provides technical support.
Should be understood that; Above-mentioned description to preferred embodiment is comparatively detailed, can not therefore think the restriction to scope of patent protection of the present invention, and those of ordinary skill in the art is under enlightenment of the present invention; Do not breaking away under the scope situation that claim of the present invention protects; Can also make various deformation such as replacement, simple combination, these all fall within protection scope of the present invention, and the scope of asking for protection of the present invention should be as the criterion with accompanying claims.
Claims (9)
1. bracket spraying dust reduction emulation simulation device for coal mine working surface, it comprises emulation blocking test case, and the front end of emulation blocking test case is provided with an air intake vent, and the rear end is provided with an air outlet; Be provided with in this emulation blocking test case the wind speed that is used to simulate coal mine work area, pressure condition distinguished and admirable power supplying apparatus, be used to simulate the dust generating means that the coal mine work area dust produces situation, spraying plant and the detection system that is used to simulate coal mine work area support nozzle spray situation, distinguished and admirable power supplying apparatus is arranged on air intake vent; The dust generating means is arranged on the front portion of emulation blocking test case, is positioned at the rear of air intake vent; Spraying plant and detection system are separately positioned on the middle part of emulation blocking test case.
2. bracket spraying dust reduction emulation simulation device for coal mine working surface according to claim 1; It is characterized in that: above-mentioned emulation blocking test case comprises distinguished and admirable divergent segment and experimental section; Distinguished and admirable divergent segment is positioned at the place ahead of experimental section; Air intake vent and dust generating means are separately positioned on the distinguished and admirable divergent segment, and spraying plant, detection system and air outlet are separately positioned on the experimental section.
3. bracket spraying dust reduction emulation simulation device for coal mine working surface according to claim 2 is characterized in that: above-mentioned distinguished and admirable divergent segment outline is for lacking the truncated rectangular pyramids shape on base, and its height is two to select First Five-Year Plan rice, and the flaring angle of distinguished and admirable divergent segment is 22 six degree; Air intake vent is arranged on the front end of distinguished and admirable divergent segment, and air intake vent is that a diameter is 14 meter a circular port.
4. according to claim 2 or 3 described bracket spraying dust reduction emulation simulation device for coal mine working surface, it is characterized in that: above-mentioned experimental section outline is for lacking the rectangular post on base, and its length is respectively three meters, three meters, 25 meters; Air outlet is arranged on the rear end of experimental section, and it is a rectangular opening, and the length and width of air outlet is respectively three meters, 25 meters.
5. bracket spraying dust reduction emulation simulation device for coal mine working surface according to claim 4; It is characterized in that: by thickness is the emulation blocking test case that one centimetre organic glass is processed; The base plate of its experimental section is provided with 3/1000ths the gradient, and this gradient is directed downwards inclination along part to the air outlet that joins from distinguished and admirable divergent segment and experimental section.
6. bracket spraying dust reduction emulation simulation device for coal mine working surface according to claim 5 is characterized in that: be respectively arranged with two slideways on the top board of experimental section and the base plate, the slideway of top board is corresponding one by one up and down with the slideway of base plate; Spraying plant comprises a nozzle holder; Nozzle holder comprises two columns and a crossbeam, and column lays respectively at the two ends of crossbeam, and column is arranged between the slideway of slideway and base plate of top board; Column can move along corresponding slideway is forward and backward, and crossbeam can move along column is upper and lower.
7. bracket spraying dust reduction emulation simulation device for coal mine working surface according to claim 6 is characterized in that: the middle part of above-mentioned experimental section evenly is provided with a plurality of apertures; Detection system comprises tilting micromanometer and compensate-type micropressure meter, and tilting micromanometer is connected with corresponding aperture respectively with compensate-type micropressure meter.
8. bracket spraying dust reduction emulation simulation device for coal mine working surface according to claim 7 is characterized in that: above-mentioned distinguished and admirable power supplying apparatus adopts the axial fan of inorganic VFC mode.
9. bracket spraying dust reduction emulation simulation device for coal mine working surface according to claim 8 is characterized in that: the outer setting of above-mentioned experimental section has split type spraying laser particle size analyzer.
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