EP0051382A2 - Mischer - Google Patents
Mischer Download PDFInfo
- Publication number
- EP0051382A2 EP0051382A2 EP81304879A EP81304879A EP0051382A2 EP 0051382 A2 EP0051382 A2 EP 0051382A2 EP 81304879 A EP81304879 A EP 81304879A EP 81304879 A EP81304879 A EP 81304879A EP 0051382 A2 EP0051382 A2 EP 0051382A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- agitator
- motor
- vessel
- noise level
- monitoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000004044 response Effects 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
Definitions
- This invention relates to a development in the mixing apparatus disclosed in our prior published European Patent Application No 0000827, the disclosure of which is incorporated herein by reference.
- the object of the present invention is to overcome the above mentioned drawback.
- mixing apparatus comprising a vessel for receiving liquid and other materials to be mixed, a rotary agitator for immersion into the contents of the vessel, means for rotatably driving said agitator and means responsive to the noise level emitted by the contents of the vessel during agitation for automatically adjusting the vertical position of the agitator, characterised by means for monitoring the drive means so as to sense abnormal operating conditions.
- an abnormal operating condition may correspond to the rotor being raised above the surface of the liquid within the mixing vessel.
- Another possibility that may be detected by the monitoring means is malfunctioning of the drive system, e.g. failure of an electric drive motor.
- the drive system comprises an electric motor, as in the apparatus described in our prior Application, and the monitoring means is responsive to the motor current which, it will be appreciated, will decrease significantly when the rotor rises above the liquid surface level because the drag on the rotor exerted by a layer of powder or air is considerably less than that exerted by the liquid.
- the monitoring means conveniently, in response to significant reduction in motor current, generates a signal to cause lowering of the rotor automatically and this signal may at least temporarily override the controls which position the rotor according to the noise levels prevailing.
- the monitoring means may for example be in the form of a device which senses motor current and converts it into voltage so that when the motor current drops below a predetermined minimum value, the logic state of the output channel of the monitoring means changes to provide the above mentioned signal.
- the control circuitry of the apparatus may be designed to provide, in essence, three output channels corresponding to the raise, lower and motor detector conditions with appropriate gating to derive an output signal consistent with the desired operating conditions.
- the output derived from the monitoring means in response to the presence of an abnormal operating condition will override those signals produced by the apparatus during normal operation.
- control circuitry illustrated in the accompanying drawing may for the most part be generally similar to that disclosed in our published Patent Application No. 0000827 and the description herein will therefore be confined to the modifications provided by the present invention.
- the control circuits depicted by the blocks 10 and 12 respectively correspond to circuitry illustrated in Figures 2a and 2b of Patent Application No. 0000827 and reference should be made to the prior application for detailed description.
- the circuits 10, 12 serve to process the output from the microphone 14 in order to produce control signals governing the vertical positioning of the rotary agitator of the mixing apparatus.
- the circuit 10 provides two outputs 16, 18 such that a signal appears either at output 16 or 18 depending respectively on whether the noise level is below or above a predetermined range. If the noise level is below the predetermined range, the circuit 12 will produce a control signal to effect raising of the agitator and vice versa.
- the modification introduced by the invention involves the use of means for sensing the current drawn by the electric motor for rotatably driving the mixing agitator.
- Such means may comprise a current transformer 20 connected in circuit with the motor and interface circuitry 22 for providing an output 24 representing the motor current.
- the outputs 16,18 are gated with the outputs 24 in gating circuitry 26 in accordance with the following conditions. If the output 24 corresponds to normal motor current levels, the output 16, 18 are coupled by the gating circuitry 26 to inputs 28, 30 respectively of the control circuitry 12. In these circumstances, the apparatus operates in the manner described in Patent Application No. 2002646.
- the output 24 corresponds to a low motor current such as occurs if the agitator is withdrawn from the body of liquid within the mixing vessel then the output 16 is de-coupled from input 28 and the output 24 is coupled to the input 30 so as to cause the circuit 12 to generate an output resulting in lowering of the agitator.
- the motor current will return to a normal level with resumption of normal control of the agitator by the outputs 16,18 which will once again be connected to the inputs 28,30 respectively. It will be seen that the output 24 is effective to override normal operation of the apparatus in circumstances where the motor control current falls substantially and will therefore overcome any tendency for the apparatus to continue raising the agitator through failure to detect a change in noise level due to the presence of a blanketing layer of solids on the liquid surface.
- lowering of the agitator in response to fall in motor current may be sustained for longer than is strictly necessary to re-introduce the agitator back into the liquid.
- the circuitry 22 may, in response to detection of a substantial fall in motor current, produce a corresponding signal at output 24 for a predetermined time interval sufficient to re-immerse the agitator to a desired depth before allowing resumption of control in accordance with the noise level detected by the microphone.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Accessories For Mixers (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8035429 | 1980-11-04 | ||
GB8035429 | 1980-11-04 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0051382A2 true EP0051382A2 (de) | 1982-05-12 |
EP0051382A3 EP0051382A3 (en) | 1983-03-30 |
EP0051382B1 EP0051382B1 (de) | 1985-10-09 |
Family
ID=10517081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81304879A Expired EP0051382B1 (de) | 1980-11-04 | 1981-10-20 | Mischer |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0051382B1 (de) |
DE (1) | DE3172624D1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2120565A (en) * | 1982-05-29 | 1983-12-07 | Janke & Kunkel Gmbh Co Kg | Stirring apparatus |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB782523A (en) * | 1954-04-30 | 1957-09-11 | Weston David | Dry grinding control |
DE1296103B (de) * | 1965-09-20 | 1969-05-29 | Fullerton Betty Jane | Automatische Nachlassvorrichtung fuer Tiefbohranlagen |
US3460812A (en) * | 1968-03-25 | 1969-08-12 | Robert R Kaufman | Concrete mixing control apparatus for concrete mixing trucks |
US3480212A (en) * | 1967-02-23 | 1969-11-25 | Reserve Mining Co | Control apparatus |
GB1237290A (en) * | 1969-02-24 | 1971-06-30 | Cox S Machinery Ltd | Mixing apparatus |
DE2204184A1 (de) * | 1971-02-01 | 1972-08-10 | Kearney & Trecker Corp | Maschine, insbesondere Werkzeugmaschine |
US4084442A (en) * | 1975-11-27 | 1978-04-18 | The Boots Company Limited | Control of processes |
-
1981
- 1981-10-20 DE DE8181304879T patent/DE3172624D1/de not_active Expired
- 1981-10-20 EP EP81304879A patent/EP0051382B1/de not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB782523A (en) * | 1954-04-30 | 1957-09-11 | Weston David | Dry grinding control |
DE1296103B (de) * | 1965-09-20 | 1969-05-29 | Fullerton Betty Jane | Automatische Nachlassvorrichtung fuer Tiefbohranlagen |
US3480212A (en) * | 1967-02-23 | 1969-11-25 | Reserve Mining Co | Control apparatus |
US3460812A (en) * | 1968-03-25 | 1969-08-12 | Robert R Kaufman | Concrete mixing control apparatus for concrete mixing trucks |
GB1237290A (en) * | 1969-02-24 | 1971-06-30 | Cox S Machinery Ltd | Mixing apparatus |
DE2204184A1 (de) * | 1971-02-01 | 1972-08-10 | Kearney & Trecker Corp | Maschine, insbesondere Werkzeugmaschine |
US4084442A (en) * | 1975-11-27 | 1978-04-18 | The Boots Company Limited | Control of processes |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2120565A (en) * | 1982-05-29 | 1983-12-07 | Janke & Kunkel Gmbh Co Kg | Stirring apparatus |
Also Published As
Publication number | Publication date |
---|---|
EP0051382A3 (en) | 1983-03-30 |
DE3172624D1 (en) | 1985-11-14 |
EP0051382B1 (de) | 1985-10-09 |
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