CN201959866U - Hydraulic differential control device of centrifugal machine - Google Patents

Hydraulic differential control device of centrifugal machine Download PDF

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Publication number
CN201959866U
CN201959866U CN 201020500295 CN201020500295U CN201959866U CN 201959866 U CN201959866 U CN 201959866U CN 201020500295 CN201020500295 CN 201020500295 CN 201020500295 U CN201020500295 U CN 201020500295U CN 201959866 U CN201959866 U CN 201959866U
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CN
China
Prior art keywords
voltage
hydraulic
pressure
frequency converter
differential
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Expired - Fee Related
Application number
CN 201020500295
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Chinese (zh)
Inventor
陆中华
陆炯
殷立
严正荣
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SHANGHAI CENTRIFUGE INSTITUTE Co Ltd
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SHANGHAI CENTRIFUGE INSTITUTE Co Ltd
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Priority to CN 201020500295 priority Critical patent/CN201959866U/en
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Publication of CN201959866U publication Critical patent/CN201959866U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model relates to a centrifugal machine, belongs to the field of industrial control and discloses a hydraulic differential control device of a centrifugal machine. The hydraulic differential control device of the centrifugal machine comprises a hydraulic pump (1) and a frequency conversion motor (2), and the hydraulic pump (1) is connected with a hydraulic motor (3). The hydraulic differential control device is characterized in that a pressure transmitter (4) is mounted on the hydraulic pump (1) and is connected with a pressure input end of a controller (5), an output end of the controller (5) is connected to a voltage input end of a frequency converter (6), inputted pressure signals are converted into voltage signals to be transmitted to the frequency converter (6), and the frequency converter (6) directly controls the frequency conversion motor (2) so as to control flow of outputted hydraulic oil of the hydraulic pump (1) and rotation speed of the hydraulic motor (3). The circuit controller and the frequency converter are combined to control hydraulic differential of the centrifugal machine, cost of products and service and maintenance cost are reduced, and further the hydraulic differential control device is convenient and practical, and increases service efficiency of the products.

Description

A kind of hydraulic differential of centrifuge control device
Technical field
The utility model relates to a kind of centrifuge, relates in particular to the hydraulic differential control device of centrifuge.
Background technology
The differential control that is used for the horizontal screw centrifuge of sludge dewatering generally has hydraulic control differential mechanism, two VFC differential mechanism, mechanical differential gear box and current vortex control differential mechanism, because hydraulic differential has advantages such as little differential, low energy consumption, high mass dryness fraction, be the high-end product of differential control in the horizontal screw centrifuge.The control characteristics of hydraulic differential are as shown in Figure 1: pressure during less than normal pressure p0 (can calculate) according to the mud weight classes of handling the differential of centrifuge keep initial differential Δ n0 constant; differential increases along with the increase of pressure is linear synchronously when pressure overgauge pressure p 0; thereby accelerate the velocity of discharge of mud; owing to accelerated spoil disposal speed; the pressure of hydraulic system reduces; when coming back to less than normal pressure p0 point, pressure keep differential constant at Δ n0; when pressure stops feed pump and dosing pump during greater than 1 of pressure p of protection; no longer increase treating capacity and protect, when pressure stops centrifuge during greater than limiting pressure p2 point as centrifuge.
Realize above-mentioned difference control function, at present external hydraulic differential controller adopts high-accuracy mechanical automatic regulating valve and volume adjustable hydraulic pump to realize, domesticly can't produce similar high-accuracy mechanical autocontrol valve, and should also have only two companies of Switzerland and Germany to produce abroad by the machinery autocontrol valve, price is very expensive, cause with high costsly, can't extensively adopt.And loss very easily appears on this high-accuracy mechanical autocontrol valve use centrifuge at home, the frequency of changing parts is very high, so maintenance cost is also very high.
For addressing the above problem, the applicant has applied for that in 2009 " a kind of method for electrically controlling hydraulic differential of centrifuge " proposed to adopt frequency converter to cooperate intelligence instrument to realize the method that the hydraulic differential of centrifuge is controlled as controller, but still there are intelligence instrument price height, update routine complexity in the practice, and in maintenance, need the shortcoming of debugging after corrected parameter trouble and each the correction, therefore the hydraulic differential control to centrifuge proposes a kind of new control device.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of hydraulic differential control device of centrifuge, solves existing control device cost height, uses inconvenient defective.
Technical scheme
A kind of hydraulic differential of centrifuge control device, comprise the hydraulic pump and the variable-frequency motor that are connected with hydraulic motor, it is characterized in that: on described hydraulic pump, pressure transmitter is installed, described pressure transmitter links to each other with the pressure input of controller, the output of described controller is connected to the voltage input end of frequency converter, the pressure signal of importing is converted into voltage signal sends frequency converter to, thereby frequency converter is directly controlled the flow of variable-frequency motor control hydraulic pump and the rotating speed of hydraulic motor.
The force value that described controller is accepted at the pressure input is during smaller or equal to normal pressure, and the magnitude of voltage of output is 0V, and frequency converter is operated in original frequency, and the differential of control centrifuge is initial differential; Described controller is when the force value overgauge pressure that the pressure input is accepted, the linear ratio of the magnitude of voltage of output increases, output voltage is a limiting voltage when force value reaches the limit of pressure, the also corresponding linear ratio of frequency converter output frequency increases, when limiting voltage, reach maximum, and control centrifuge differential reaches maximum.
Described controller comprises follows loop, comparison loop and ratio amplifying return circuit, voltage follow and voltage stabilizing are carried out to the current signal that pressure transmitter transmits in the described loop of following, described comparison loop after with voltage stabilizing voltage and the voltage of setting compare, described ratio amplifying return circuit carries out ratio to voltage relatively and amplifies.
Described controller adopts two operational amplifier loops to finish, first operational amplifier is followed the loop by connecting supply voltage and a plurality of resistance and unity feedback composition, promptly according to the corresponding voltage of accepting of current signal output, the voltage of output is as the input voltage of the in-phase end of second operational amplifier, end of oppisite phase input voltage employing adjustable potentiometer setting voltage at second operational amplifier is that hydraulic pressure is the pairing voltage of normal pressure, be connected with adjustable potentiometer and be used to set magnification ratio between the end of oppisite phase of second operational amplifier and output, the output of second operational amplifier links to each other with the input of frequency converter.
Described operational amplifier adopts LM324.
Beneficial effect
Hydraulic differential of centrifuge control device of the present utility model adopts circuit controller and frequency converter combination that hydraulic differential of centrifuge is controlled, cost was both low and easy to use, it is also highly stable after the circuit controller debugging is finished, also very convenient when needing corrected parameter, as long as changing corresponding potentiometer promptly can finish, not only reduced product cost but also reduced the working service cost, and convenient and practical, improved the product service efficiency.
Description of drawings
Fig. 1 is the control characteristics schematic diagram of hydraulic differential in the utility model;
Fig. 2 is the utility model control device overall schematic;
Fig. 3 is the circuit diagram in the utility model middle controller.
Wherein: 1-hydraulic pump, 2-variable-frequency motor, 3-hydraulic motor, 4-pressure transmitter, 5-controller, 6-frequency converter, 7-spiral, 8-rotary drum.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the utility model.
The hydraulic differential of centrifuge control device, comprise the hydraulic pump 1 and the variable-frequency motor 2 that are connected with hydraulic motor 3, on described hydraulic pump 1, pressure transmitter 4 is installed, described pressure transmitter 4 links to each other with the pressure input of controller 5, the output of described controller 5 is connected to the voltage input end of frequency converter 6, the pressure signal of importing is converted into voltage signal sends frequency converter 6 to, thereby frequency converter 6 is directly controlled the flow of variable-frequency motor 2 control hydraulic pumps 1 and the rotating speed of hydraulic motor 3, rotating speed by frequency converter 6 regulator solution press pumps 1 station variable-frequency motor 2, thereby regulate the flow of hydraulic oil, coming the rotating speed of regulator solution pressure motor 3 by the change hydraulic fluid flow rate is the differential of centrifuge.
The output frequency of frequency converter 6 is controlled with the 0-10V analog quantity, the initial differential Δ n0 of centrifuge is regulated by the original frequency of frequency converter 6, when hydraulic pressure during less than p0, controller 5 output voltages are 0V, the analog input voltage of frequency converter 6 is 0V, frequency converter 6 is operated in original frequency, the differential of centrifuge is Δ n0, when hydraulic pressure during greater than p0, controller 5 output voltages begin synchronous increase from 0V, and frequency converter 6 output frequencies begin to increase from original frequency, and hydraulic motor 3 rotating speeds increase, differential between centrifuge spiral 7 and the rotary drum 8 increases synchronously, accelerates the speed of centrifuge blowdown mud.When controller 5 output voltages were 10V, frequency converter 6 output frequencies were 50HZ, made the centrifuge differential reach maximum.And owing to accelerated spoil disposal speed, the pressure of hydraulic system reduces, and then pressure transmitter 4 sends the signal reduction of controller 5 to, thereby controller 5 output voltages reduce, and the output frequency of frequency converter 6 also reduces, and the differential of centrifuge is reduced.Controller 5 output voltages are again 0 after hydraulic pressure is less than P0, and frequency converter 6 is operated in original frequency again, make the initial differential Δ of being operated in of centrifuge n0.
Circuit in the controller 5 as shown in Figure 3, measure the pressure transmitter 4 output 4-20mA of hydraulic fluid pressure, corresponding pressure 0-250bar, obtain input voltage Ui=1-5V voltage by 250 Ω resistance samplings, operational amplifier U2A is a follower, to improve input impedance, reduce output impedance, follower output voltage U 01=Ui.The setting value that potentiometer RP1 setting voltage Ug is ordered as normal pressure P0, operational amplifier U2B output voltage U 0=0V when U01<Ug, the analog input of frequency converter 6 at this moment is for being 0, and frequency converter 6 is operated in original frequency, and centrifuge is operated in initial differential Δ n0.U01>Ug when hydraulic pressure surpasses P0, operational amplifier U2B carry out the difference in-phase proportion and amplify.
Adjustment method:
(1) setting of pressure spot P0, if P0 is set at 50bar, pressure transmitter 4 output currents Be Ui=I * 250=1.8V, so when Ug was set at 1.8V, P0 was set at 50bar.
The adjustment of the multiplication factor of the amplifier when (2) frequency converter 6 is exported highest frequency 50HZ.If frequency converter 6 output 50Hz when requiring hydraulic pressure to be 200bar, then during 200bar, pressure transmitter 4 output currents are Ui=I * 250=4.2V, the substitution formula Obtain RP2=22K.
Frequency converter 6 adopts three to cultivate frequency converter, and the main parameter that is provided with of this frequency converter 6 is:
The code parameter explanation
Cd002 3 usefulness 0-10V analog quantitys are come regulator solution voltage frequency changer frequency
Cd007 50 upper limiting frequencies are 50HZ
Cd054 8 initial differential frequencies are 8HZ
Cd055 100 regulates pressure-differential slope of curve
From above-mentioned analysis as can be known: as hydraulic pressure hydraulic pressure frequency converter output frequency 8HZ during less than 50bar, when hydraulic pressure during greater than 50bar, frequency converter 6 Frequency Synchronization ratios increase, when hydraulic pressure reaches 200bar, and frequency converter 6 output 50HZ.Frequency converter 6 parameter c d55 regulate frequency converter 6 frequency gain, also adjustable pressure-differential slope of curve, and the effect of its effect and regulator potentiometer RP2 allocation and transportation calculation amplifier magnification ratio is the same.

Claims (4)

1. hydraulic differential of centrifuge control device, comprise the hydraulic pump (1) and the variable-frequency motor (2) that are connected with hydraulic motor (3), it is characterized in that: pressure transmitter (4) is installed on described hydraulic pump (1), described pressure transmitter (4) links to each other with the pressure input of controller (5), the output of described controller (5) is connected to the voltage input end of frequency converter (6), the pressure signal of importing is converted into voltage signal sends frequency converter (6) to, frequency converter (6) is directly controlled variable-frequency motor (2) thereby the flow of control hydraulic pump (1) and the rotating speed of hydraulic motor (3).
2. hydraulic differential of centrifuge control device as claimed in claim 1, it is characterized in that: described controller (5) comprises follows loop, comparison loop and ratio amplifying return circuit, voltage follow and voltage stabilizing are carried out to the current signal that pressure transmitter (4) transmits in the described loop of following, described comparison loop after with voltage stabilizing voltage and the voltage of setting compare, described ratio amplifying return circuit carries out ratio to voltage relatively and amplifies.
3. hydraulic differential of centrifuge control device as claimed in claim 2, it is characterized in that: described controller (5) adopts two operational amplifier loops to finish, first operational amplifier is followed the loop by connecting supply voltage and a plurality of resistance and unity feedback composition, promptly according to the corresponding voltage of accepting of current signal output, the voltage of output is as the input voltage of the in-phase end of second operational amplifier, end of oppisite phase input voltage employing adjustable potentiometer setting voltage at second operational amplifier is that hydraulic pressure is the pairing voltage of normal pressure, be connected with adjustable potentiometer and be used to set magnification ratio between the end of oppisite phase of second operational amplifier and output, the output of second operational amplifier links to each other with the input of frequency converter.
4. hydraulic differential of centrifuge control device as claimed in claim 3 is characterized in that: described operational amplifier adopts LM324.
CN 201020500295 2010-08-20 2010-08-20 Hydraulic differential control device of centrifugal machine Expired - Fee Related CN201959866U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201020500295 CN201959866U (en) 2010-08-20 2010-08-20 Hydraulic differential control device of centrifugal machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201020500295 CN201959866U (en) 2010-08-20 2010-08-20 Hydraulic differential control device of centrifugal machine

Publications (1)

Publication Number Publication Date
CN201959866U true CN201959866U (en) 2011-09-07

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Application Number Title Priority Date Filing Date
CN 201020500295 Expired - Fee Related CN201959866U (en) 2010-08-20 2010-08-20 Hydraulic differential control device of centrifugal machine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104475274A (en) * 2014-11-10 2015-04-01 上海市离心机械研究所有限公司 Intelligent control method for hydraulic differential of centrifugal machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104475274A (en) * 2014-11-10 2015-04-01 上海市离心机械研究所有限公司 Intelligent control method for hydraulic differential of centrifugal machine
CN104475274B (en) * 2014-11-10 2018-01-05 上海市离心机械研究所有限公司 A kind of hydraulic differential of centrifuge intelligent control method

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110907

Termination date: 20150820

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