CN87202472U - Dispersive and multipoint explosive auto-feeding device for flotation system - Google Patents

Abstract

The utility model discloses a dispersive multipoint automatic agent feeding device for a flotation system, which is suitable for coal separating plants. The utility model is composed of an electromagnetic flow meter arranged on a raw pulp feeding pipeline, a pulp concentration meter, a throttling differential pressure flow meter arranged on an agent transmission main pipeline, a plurality of agent transmission branch pipelines branched out toward a plurality of flotation machines, a plurality of agent feeding points arranged on the agent transmission branch pipelines, and a microprocessor. The device achieves closed-loop automatic adjustment of automatic tracking the agent feed amount and floating dry mine amount, has the advantages of high control precision and high sorting efficiency, meets the requirements for proportionally feeding agent technologically in the dispersive multiple-point way and saves the agent.

Description

Dispersive and multipoint explosive auto-feeding device for flotation system

The utility model belongs to the flotation auxiliary equipment, particularly a kind ofly is applicable to coal preparation plant's flotation, in the coal floatation process of workshop, adds the device of floating agent (hereinafter to be referred as dosing) automatically.

At present, most of coal preparation plants flotation workshop is still employing and manually estimates ore pulp and medicament flow by rule of thumb, when condition changes, must manual setting, and complex operation is regulated untimelyly, inaccurate, and the efficiency of separation is low, unstable product quality, and cause waste.

Abroad, as West Germany, the coal preparation plant that has has realized the automatic Detection ﹠ Controling of floatation process, is example to open coal washery, the Fan Ge village, Luan recently from the technology and equipment that West Germany introduces, they are in floatation system, adopt electromagnetic flowmeter and isotopes concentration meter to detect mineral slurry flux and concentration, regulate ore pulp with governor impeller and go into amount, what the medicament adding set was used is plunger displacement pump.At home, as flotation workshop, Wang Fenggang coal washery, Huainan, bring into use electromagnetic flowmeter and isotopes concentration meter as instrumentation recently, by YE control ore pulp and dilution water valve, realize going into to float the automatic adjusting of pulp density and flow, add floating agent by mlultiplying circuit and gear pump.In a word, existing both at home and abroad flotation dosing device, but the floating agent amount of tiny flow quantity is not still had the measuring instrument on-line measurement.Therefore, the automatic interpolation of medicament is still opened a way, and precision and reliability are low; The medicament addition manner adopts plunger displacement pump or gear pump, and the dosing method that converges also fails to realize medicament is disperseed to be added in proportion in kaskad apparatus for pre-flotation pulp conditioning and each flotation cell of flotation device, can not satisfy technological requirement.

Task of the present utility model provides a kind of device that disperses multiple spot to add floating agent automatically, it can be by actual floating dry mine content, close-loop automatic adjustment adds dose, disperses according to technological requirement that multiple spot is pro rata to be added on floating agent in kaskad apparatus for pre-flotation pulp conditioning and each flotation cell of flotation device.

The utility model is the throttling differential pressure flowmeter of carrying on the total main road (1) of floating agent (hereinafter to be referred as loading) by being contained in (2), generally tell a loading bye-pass to kaskad apparatus for pre-flotation pulp conditioning (23) from the total main of loading road (1), and be provided with one and add snack made with traditional Chinese medicines, some loading branch lines (3) are told to some groups of flotation devices (24) in total main road (1), for the floatation system of forming by some groups of flotation devices, every group of flotation device all is provided with a loading branch line (3), on every loading branch line (3), be provided with several and add snack made with traditional Chinese medicines, each adds snack made with traditional Chinese medicines by having potentiometric monostable switch (4), servo circuit (5) and have the magnetic valve (6) that dosing chews and form, so just form and disperse the multiple spot medicine system, electromagnetic flowmeter (8) and ore pulp concentration meter (9) are housed, in order to obtain to go into to float the flow signal I of raw ore slurry on raw ore slurry supplied materials pipeline (7) ₁With concentration signal I ₂, and set a medicine ore deposit than coefficient signal I ₃, aforementioned signal multiplies each other through multiplier (10), obtains a given signal I who is proportional to the required additive amount of medicament of floating dry mine content ₄, i.e. I ₄=I ₃* I ₂* I ₁, given signal I ₄Actual dose addition signal I with above-mentioned throttling differential pressure flowmeter (2) output ₅Compare, its deviation signal △ I is through PID adjuster (this adjuster is operated in " oppositely ") (11) and modulus converter A/D (12), obtain the pulse signal of corresponding frequencies, drive the ratio dosing on request of monostable switch (4) control dosing magnetic valve (6).Realized the close-loop automatic adjustment of additive amount of medicament from the dried ore deposit of motion tracking amount, the control accuracy height can satisfy and disperse the pro rata dosing requirement of multiple spot on the technology, and constant product quality is saved medicament, improves the efficiency of separation.

Below with reference to accompanying drawing the utility model is described in further detail.

As shown in the figure, throttling differential pressure flowmeter (2) with measurement tiny flow quantity is installed on the total main of the loading road (1), and said throttling differential pressure flowmeter (2) is made up of the restricting orifice (13) in the total main of the loading of packing into the road, the capacitance differential pressure meter (14) that is communicated with by skirt before and after restricting orifice (13) and current conversion (15) and extracting operation (16) link.Restricting orifice (13) is to be that 0.2～0.3 millimeter bronze sheet is made with thickness, middle bore one can be by the circular hole of required maximum medicament flow, general aperture is 2～3 millimeters; The capacitance differential pressure meter can be selected the product of existing CECC-220 type or CECC-320 type for use, its the sensitiveest retaining is 0～100 millimeter of water, but carrying floating agent is tiny flow quantity, generally can only produce 0～20 millimeter of water pressure reduction, obviously directly use existing capacitance differential pressure meter in order to measure tiny flow quantity, its sensitivity is low, here need by current conversion (15) and extracting operation (16) link, once more signal is amplified, thereby obtain the sensitivity of 4～20 milliamperes of 0～20 millimeter of water or differential pressure respective signal, current conversion (15) and extracting operation (16) link are equivalent to secondary meter.At throttling differential pressure flowmeter (2) timing signal, the suitably zero point and the sensitivity of control capacittance formula difference gauge (14) makes electric current when pharmaceutical quantities changes to required medicament maximum addition from zero, and corresponding output signal changes to 20 milliamperes from 4 milliamperes.The effect of throttling differential pressure flowmeter (2): the actual dose flow signal is become differential pressure signal △ P by restricting orifice (13), through capacitance differential pressure meter (14) differential pressure signal △ P is transformed into corresponding current signal, this current signal feed-in microprocessor (usefulness is single-loop regulator here) carries out that current conversion (15) is amplified and extracting operation (16), said extracting operation be exactly medicament flow Q=K * $\sqrt{\mathrm{△P}}$ , K---constant just converts capacitance differential pressure meter output signal to be directly proportional with the medicament flow current signal I thus ₅I ₅Be exactly foregoing actual dose addition signal, I ₅Signal is through the given signal I of comparator (19) with the required additive amount of medicament of floating dry mine content ₄Compare.This given signal I ₄By be arranged on electromagnetic flowmeter (8) on the raw ore slurry supplied materials pipeline (7), ore pulp concentration meter (9), and multiplier (10) computing obtain, wherein electromagnetic flowmeter (8) is made up of the VUB type transmitter (being electromagnetic flow transducer) (17) and the VKB type converter (secondary meter) (18) that are serially connected on the supplied materials pipeline (7), and it exports a flow signal I who goes into to float raw ore slurry ₁The measurement of pulp density is to draw on the origin material pipeline (7) to pick out a measurement bucket (21), puts into two bellows of the two flange form difference gauges (22) of 1151DP type, and output goes into to float raw ore slurry concentration signal I ₂The medicine ore deposit ratio of determining through laboratory test, set a medicine ore deposit than coefficient signal I by the key (20) on the microprocessor ₃, aforementioned I ₁And I ₂Signal is tried to achieve and is done the ore deposit amount through multiplier (10) computing, multiply by coefficient signal I again ₃, promptly obtained the given signal I of the required additive amount of medicament of floating dry mine content ₄, given signal I ₄Feed-in comparator (19) is with above-mentioned actual dose addition signal I ₅Compare its deviation signal △ I=I ₅-I ₄Feed-in PID adjuster (11) carries out computing, and this adjuster is operated in " oppositely " state.When if deviation signal △ I is negative, be the given signal of actual dose addition signal less than required additive amount of medicament, this deviation signal increases the output of PID adjuster (11), by the pulse signal that a string frequency of modulus converter A/D (12) output improves, pulse signal control respectively adds the monostable switch (4) of snack made with traditional Chinese medicines and dosing magnetic valve (6) to be made and adds the dose increase; Otherwise, the actual dose signal I that adds ₅Greater than the required given signal I that adds dose ₄The time, the output of PID adjuster (11) reduces, the pulse signal that a string frequency of modulus converter A/D (12) output reduces, and control respectively adds the monostable switch (4) of snack made with traditional Chinese medicines and dosing magnetic valve to be made and adds dose and reduce.Directly cause the actual dose that adds and equal the required set-point that adds dose, PID adjuster (11) output signal remains unchanged, and analog-digital converter (12) output pulse frequency also remains unchanged, and dosing speed is constant.Reach additive amount of medicament and follow the tracks of the close-loop automatic adjustment of floating dry mine content automatically.The computational process of aforementioned currents conversion (15), extracting operation (16), comparator (19), key (20), multiplier (10) and PID adjuster (11) all adopts single-loop regulator (promptly by OLC type microprocessor) to carry out.

The monostable switch (4) that respectively adds snack made with traditional Chinese medicines can be selected the two Shi Mite input of T1221 one-shot multivibrator for use, or uses transistor circuit, and disposes a potentiometer.The pulse signal of monostable switch (4) output, the servo circuit of forming via reverse-blocking tetrode thyristor (5) amplifies, and control DF2-3 type has magnetic valve (6) dosing that dosing is chewed.What each added snack made with traditional Chinese medicines adds the dose size by the technological requirement pro rate, and said here ratio is to establish floatation system always to add dose be 1 o'clock, and then each allocation proportion that adds snack made with traditional Chinese medicines is the coefficient less than 1, and its summation is 1.Before system works, at first must be in the dosing ratio that respectively adds snack made with traditional Chinese medicines, adjust retention time of monostable switch (4) with potentiometer, if certain adds snack made with traditional Chinese medicines dosing ratio when big, the retention time of monostable switch (4) is just long, otherwise just short.Have several when adding snack made with traditional Chinese medicines for a loading branch line (3), pulse of the every output of modulus converter A/D (12), on this branch line (3) first adds monostable switch (4) action of snack made with traditional Chinese medicines, magnetic valve (6) is opened dosing, after treating the end of this monostable switch retention time, monostable switch turn-offs, magnetic valve stops dosing, send a pulse signal simultaneously and give second monostable switch that adds snack made with traditional Chinese medicines, make its action, magnetic valve is opened dosing, relays successively, finishes dosing action; When second pulse arrives, repeat said process again, surplus person analogizes.

Claims (5)

1, a kind ofly disperses the multiple spot automatic medicine adding apparatus by being contained in the floatation system that electromagnetic flowmeter [8] on the raw ore slurry supplied materials pipeline [7] and ore pulp concentration meter [9] formed, it is characterized in that comprising that one is contained in the total main of loading road [1] and goes up in order to throttling differential pressure flowmeter [2], the microprocessor of measuring the medicament tiny flow quantity and some the loading branch lines [3] that branch out from the total main road direction of loading floatation system, go up several that be provided with at every loading branch line [3] and add snack made with traditional Chinese medicines.

2,, it is characterized in that throttling differential pressure flowmeter (2) is formed by the restricting orifice (13) in the total main of the loading of packing into the road (1), the capacitance differential pressure meter (14) that is communicated with by skirt and by current conversion (15) and extracting operation (16) link that microprocessor is realized before and after restricting orifice according to the described device of claim 1.

3, according to claim 1 or 2 described devices, it is characterized in that sensitivity 0～20 millimeter of water of throttling differential pressure flowmeter, or 4～20 milliamperes of the sensitivity of differential pressure respective signal.

4,, it is characterized in that at floatation system at least one being set adds snack made with traditional Chinese medicines according to the described device of claim 1.

5,, it is characterized in that each adds snack made with traditional Chinese medicines and is formed by having potentiometric monostable switch (4), servo circuit (5) and having the magnetic valve (6) that dosing chews according to claim 1 or 4 described devices.