CN115337682A - Pressure rake prevention protection device and method for peripheral transmission thickener - Google Patents
Pressure rake prevention protection device and method for peripheral transmission thickener Download PDFInfo
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- CN115337682A CN115337682A CN202211083259.8A CN202211083259A CN115337682A CN 115337682 A CN115337682 A CN 115337682A CN 202211083259 A CN202211083259 A CN 202211083259A CN 115337682 A CN115337682 A CN 115337682A
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- thickener
- rake
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
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Abstract
The invention designs a set of driven wheel alarm protection device on the original protection equipment of a thickener, and the device consists of a PLC controller, a photoelectric sensor, a driven wheel, an audible and visual alarm and an intermediate relay. Usable speed and time's relation detects through photoelectric sensor and follows the normal time variation of uniform rotation in-process of driving wheel, takes a sample the contrast, with this signal transmission to PLC, at the inside analysis and judgement of PLC, through audible-visual annunciator notice operating personnel in time inspection processing when the abnormal conditions appear. The rake pressing accident can be effectively avoided, and after the rake pressing accident is put into use, the rake pressing protection device is combined with an original protection system, and has practicability and reliability for protecting the peripheral transmission thickener from rake pressing.
Description
Technical Field
The invention relates to the technical field of thickeners, in particular to a pressure rake prevention protection device and method for a peripheral transmission thickener.
Background
The thickener is a solid-liquid separation device based on gravity settling, has the functions of concentration, washing and buffering, is widely used in production places requiring solid-liquid enrichment and separation, such as hydrometallurgy, ore dressing plants, chemical plants and the like, and can be divided into a central transmission type and a peripheral transmission type according to different transmission modes. During the working process of the thickener, concentrate or tailings entering the concentration tank of the thickener can form underflow with higher concentration after being flocculated and precipitated by a flocculating agent. If the underflow is not pumped away in time, so that the underflow is accumulated at the bottom of the concentration tank, the stroke pressure of the concentrator is increased, when the stroke pressure exceeds the lifting rake pressure, the rake of the concentrator is lifted, but when the accumulated underflow amount is too large and exceeds the maximum lifting height of the target, the rake cannot be lifted any more, the rake is buried by the accumulated tailings, and when the underflow is accumulated to a certain degree, the rake is not rotated, namely, the rake pressing phenomenon occurs.
The rake pressing phenomenon of the thickener can cause the shutdown of the whole production system, so certain measures are needed to prevent the rake pressing phenomenon. At present, the traditional peripheral transmission thickener mainly judges the load of the thickener according to the walking pressure value, thereby adjusting the load of the thickener by automatically lifting and lowering the rake so as to reduce the occurrence of rake pressing phenomenon. However, for some faults caused by mechanical problems such as sudden trip of the thickener, a transmission wheel, an oil way and the like, the transmission wheel can idle and slip in situ; under the condition, the walking pressure of the oil pump is not changed greatly, the rake lifting and rake lowering actions cannot be triggered automatically, and operators are difficult to know and take corresponding measures in time, so that the rake pressing phenomenon is easily caused if the thickener continues to feed pulp normally; in addition, in the peripheral transmission thickener, the device for detecting the walking pressure is generally a pressure sensor, the normal walking pressure of the thickener is about 0.4MPa, and the walking pressure is always fluctuated and has a large fluctuation range, usually the fluctuation range can reach 0.1MPa, so that the pressure sensor can easily detect error signals, thereby misleading operators to make unreasonable decisions, further causing adverse effects on actual production application, and obviously, the reliability of the existing thickener pressure detection device is still to be improved.
In view of this, the present application aims to provide a rake-pressing-preventing protection device for a peripheral transmission thickener, which has high reliability and can greatly reduce the rake-pressing phenomenon probability of the thickener.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for protecting a rake against pressure of a peripheral transmission thickener.
The technical scheme of the invention is as follows: firstly, a rake-pressing-preventing protection device of a peripheral transmission thickener is provided, which comprises a thickener body, a PLC (programmable logic controller), a sensor, a driven wheel, an alarm and an intermediate relay; the driven wheel is connected with the driving wheel on the thickener body and synchronously rotates with the driving wheel; a sensor is arranged on the driven wheel; the sensor is connected with the PLC; the PLC is connected with the intermediate relay; the intermediate relay is connected with the alarm.
Furthermore, the driven wheel comprises a disc and a supporting arm, a plurality of through holes are formed in the periphery of the disc, and a center hole is formed in the center of the disc.
Furthermore, the supporting arm comprises a head and a supporting rod, wherein the head is U-shaped and comprises two side plates and a connecting plate for connecting the two side plates, the disc is arranged in the inner space of the U-shaped, and the disc is rotatably connected with the head.
Furthermore, two side plates at the head of the supporting arm are symmetrically provided with mounting holes, a central shaft is arranged between the two mounting holes, and the central shaft also penetrates through the central hole of the disc.
Furthermore, in the two side plates, only one side plate is provided with a detection hole, and the detection hole is used for installing a probe of the sensor.
Furthermore, the positions of the detection holes are matched with the positions of the through holes on the disc, so that when the disc rotates, the probes arranged in the detection holes are sequentially aligned with the through holes.
Further, the sensor is a photoelectric sensor, and when the driven wheel rotates, different signals are generated according to whether the through hole passes through the probe or not.
Furthermore, the alarm is an audible and visual alarm.
The invention also provides a rake-pressing prevention protection method of the peripheral transmission thickener, which adopts the device and comprises the following steps:
s1, acquiring original parameters
Before formal use, acquiring original parameters, wherein the original parameters are used for describing the rotating speed condition of a driving wheel of a thickener during normal operation, and firstly connecting a driven wheel in the device with the driving wheel of the thickener to ensure that the driven wheel and the driving wheel of the thickener rotate synchronously; then, the two different signals obtained after measurement are sent to a PLC controller through a sensor, and the PLC controller analyzes all the signals to obtain the original alternate change time of the two signals sent by the sensor, and the time is recorded as t0;
s2, comparing the real-time measurement result with the original parameters
When in formal use; detecting by a sensor in real time, obtaining the alternate change time of a real-time signal in the same way, recording as tx, and comparing tx with t0; making different decisions according to the comparison result;
if tx < = t0, the operation of the thickener is normal, and other operations are not needed;
if tx is greater than t0, the load of the thickener is increased to a certain degree at the moment, so that the travelling speed of the thickener is reduced, the running of the thickener belongs to overload running of the thickener and is in an abnormal state, the PLC controller outputs a signal to the intermediate relay at the moment, and the intermediate relay is used for controlling the alarm to send out an alarm signal so as to remind a worker to carry out patrol treatment.
Furthermore, the sensor is a photoelectric sensor, when the photoelectric sensor measures, the driven wheel rotates, and when a probe of the photoelectric sensor is aligned with a through hole of the driven wheel, the photoelectric sensor is in a disconnection state and sends a disconnection signal; when the probe of the photoelectric sensor is aligned with the solid part of the driven wheel, the photoelectric sensor is in a connection state and sends a connection signal, the photoelectric sensor transmits the detected connection signal and disconnection signal to the PLC, and the time of the alternate change of the two signals is obtained after the PLC analyzes the signals.
Compared with the prior art, the invention has the following beneficial effects: the invention designs a set of driven wheel alarm protection device on the original protection equipment of a thickener, and the device consists of a PLC controller, a photoelectric sensor, a driven wheel, an audible and visual alarm and an intermediate relay. Usable speed and time's relation detects through photoelectric sensor and normally rotates the time variation of in-process at the uniform velocity from the driving wheel, carries out the sample contrast, with this signal transmission to PLC, judges at the inside analysis of PLC, through audible-visual annunciator notice operating personnel in time inspection processing when the abnormal conditions appear. The driving wheel of the thickener is driven by the driving wheel to synchronously run, when the photoelectric sensor detects that the driven wheel rotates or the stop time is longer than the set time range, the phenomena of in-situ slipping of the driving wheel, tripping of the thickener and the like caused by over-slow rotating speed of the driving wheel or other conditions are explained, at the moment, the PLC outputs signals to control the intermediate relay to be electrified, the intermediate relay is used for assisting a normally open point to control the audible and visual alarm to give an alarm, operators are reminded to check and process in time, rake pressing accidents are avoided, and the reliability of the rake pressing prevention protection function of the thickener is greatly improved.
Drawings
Fig. 1 is a schematic perspective view of a driven wheel in embodiment 1 of the invention;
FIG. 2 is a schematic side view of a driven wheel in embodiment 1 of the invention;
FIG. 3 is a schematic cross-sectional view of a driven wheel of embodiment 1 of the present invention, with a bearing omitted;
FIG. 4 is a PLC control schematic diagram in embodiment 1 of the present invention;
FIG. 5 is a ladder diagram of a PLC in embodiment 1 of the present invention;
in the figure: 1-disc, 11-through hole, 2-supporting arm, 21-head, 22-supporting rod, 23-detecting hole, 24-central shaft and 3-bearing.
Detailed Description
The present invention will be described in further detail below with reference to specific examples, wherein methods or features not specifically described are known in the art.
Example 1
As shown in fig. 1-3, the embodiment is a pressure rake prevention protection device for a peripheral transmission thickener, which comprises a thickener body, a PLC controller, a sensor, a driven wheel, an alarm and an intermediate relay; the driven wheel is connected with the driving wheel on the thickener body and synchronously rotates with the driving wheel; a sensor is arranged on the driven wheel; the sensor is connected with the PLC; the PLC is connected with the intermediate relay; the intermediate relay is connected with the alarm.
In the embodiment, the driven wheel comprises a disc 1 and a supporting arm 2, 4 circular through holes 11 are formed in the periphery of the disc 1, the diameter of the disc 1 is 160mm, and the diameter of each through hole 11 is 30mm; a central hole is arranged in the center of the disc 1, the supporting arm 2 comprises a head part 21 and a supporting rod 22, wherein the head part 21 of the supporting arm 2 is U-shaped and comprises two side plates and a connecting plate for connecting the two side plates, and the disc 1 is arranged in the inner space of the U-shape. The two side plates of the head 21 of the support arm 2 are symmetrically provided with mounting holes, a central shaft 24 is arranged between the two mounting holes, the central shaft 24 also penetrates through the central hole of the disc 1, a bearing is arranged on the central shaft 24, the bearing 3 is simultaneously positioned in the central hole, and the disc 1 can freely rotate by taking the central shaft 24 as the center through the bearing 3.
In this embodiment, a detection hole 23 is provided in only one of the two side plates, and the detection hole 23 is used for mounting a probe of a sensor. The position of the detection holes 23 is adapted to the position of the through holes 11 on the disc 1, so that when the disc 1 is rotated, the probes located in the detection holes 23 can be aligned with the respective through holes 11 in turn.
In this embodiment, the sensor is a photoelectric sensor, and the alarm is an audible and visual alarm. When the driven wheel rotates, the photoelectric sensor generates different signals according to whether the through hole 11 is opposite to the probe.
The use method of the protection device in the embodiment is as follows:
s1, acquiring original parameters
Before formal use, acquiring original parameters for describing the rotation speed condition of a driving wheel of a thickener during normal operation, and connecting a driven wheel in the device with the driving wheel of the thickener to ensure that the driven wheel and the driving wheel of the thickener rotate synchronously; then, two different signals obtained in the measurement process are sent to a PLC (programmable logic controller) through a sensor, and the PLC analyzes all the signals to obtain the original alternate change time of the two signals sent by the sensor, and the time is recorded as t0;
specifically, when the photoelectric sensor measures, the driven wheel rotates, and when a probe of the photoelectric sensor is aligned with a through hole of the driven wheel, the photoelectric sensor is in a disconnection state and sends a disconnection signal; when the probe of the photoelectric sensor is aligned with the solid part of the driven wheel, the photoelectric sensor is in a connection state and sends a connection signal, the photoelectric sensor transmits the detected connection signal and disconnection signal to the PLC, the PLC analyzes the connection signal and the disconnection signal to obtain the time of the alternate change of the two signals, the time can be used for measuring the rotating speed of the driving wheel of the thickener, and the longer the time is, the slower the driving wheel rotates.
S2, comparing the real-time measurement result with the original parameters
When in formal use; detecting by a sensor in real time, obtaining the alternate change time of a real-time signal in the same way, recording the alternate change time as tx, and comparing the tx with t0; making different decisions according to the comparison result;
if tx < = t0, the operation of the thickener is normal, and other operations are not needed;
if tx is greater than t0, the load of the thickener is increased to a certain degree at the moment, the travelling speed of the thickener is slowed, the running of the thickener is in an overload state, the PLC controller outputs a signal to the intermediate relay at the moment, and the intermediate relay is used for controlling the alarm to send an alarm signal so as to remind a worker of patrol treatment.
The working principle of the embodiment is as follows:
when the driven wheel normally rotates, when a probe of the photoelectric sensor is aligned with the through hole 11 on the driven wheel, the photoelectric sensor is in a disconnected state and sends a disconnection signal; when the probe of the photoelectric sensor is aligned with the solid part of the driven wheel, the photoelectric sensor is in a switch-on state and sends a switch-on signal, and the switch-on state and the switch-off state of the photoelectric sensor are alternately changed, namely the two signals are alternately changed. In this embodiment, when the thickener operates normally, the alternation time of the photoelectric sensor is 5s (i.e., t0=5 s), the on state and the off state of the detection sample of the photoelectric sensor both send corresponding signals and transmit the signals to the PLC, and after the judgment and analysis by the internal program logic of the PLC, the corresponding signals are output to control the intermediate relay, and the auxiliary contact of the intermediate relay is used to control the audible and visual alarm. When the alternating change time of the on state and the off state of the photoelectric sensor is less than or equal to 5s, the thickener is in a normal operation state; when the time of the alternative change of the on state and the off state of the photoelectric sensor is more than 5s, the situation that the load of the thickener is increased to a certain degree at the moment is shown, the walking speed of the thickener is slowed, the running of the thickener is overloaded, the thickener is in an abnormal state, the PLC outputs tripping and alarming signals of the thickener, and the audible and visual alarm gives out audible and visual alarm to remind an operator of patrolling treatment.
As shown in fig. 3-4, the control principle and process of the PLC controller in this embodiment are specifically described as follows:
(1) Starting an X001 starting button, operating the thickener, disconnecting a normally closed contact of the X001 button, connecting a relay in the PLC, electrifying the PLC to start working, and self-protecting M0;
(2) The contacts T0 and T1 are both in a closed state, and Y000 is electrified;
(3) X000 represents the on-off state of the photoelectric sensor, when X000 is in the on state, T0 starts timing, and after 5s, T0 is delayed to be electrified; when X000 is in the off state, T1 starts to count time, and after 5s, T1 is electrified. When the thickener normally operates, X000 is in an alternative on-off state within 5s, namely when the sampling time of the photoelectric sensor for detecting the through hole 11 (X000 off state) and the solid part (X000 on state) of the driven wheel is within 5s, T0 and T1 are in an off state, and Y000 is in an on state; when the load of the thickener is increased to a certain degree, the running speed of the thickener is reduced, and when the sampling time of the photoelectric sensor for detecting the through hole 11 (X000 off state) and the solid part (X000 on state) of the driven wheel is more than 5s, T0 and T1 are in an electrified state after being delayed for 5s, and Y000 is in a power-off state;
(4) When Y000 is in a power-on state (the thickener operates normally), Y005 is in a power-off state; when Y000 is in the power-off state (the thickener is abnormal), Y005 is in the power-on state;
(5) When Y005 is in the energized state, M0 is de-energized at this time. X002 denotes a reset button (normally closed contact);
(6) When Y000 is in a power-on state, the 1J intermediate relay is powered on, the normally closed auxiliary contact of the 1J intermediate relay is in a disconnected state, and a trip signal is not output; when Y000 is in a power-off state, the 1J intermediate relay is powered off, the normally closed auxiliary contact of the 1J intermediate relay is in a closed state, a trip signal is output, the contactor of the thickener is controlled to be powered off, and the thickener stops running when the contactor is powered off;
(7) When the Y005 is in the power-on state, the 2J intermediate relay is powered on, the normally-open auxiliary contact of the 2J intermediate relay is in the closed state, an alarm signal is output, and the audible and visual alarm is powered on to send an audible and visual alarm signal; when Y005 is in the outage state, 2J intermediate relay cuts off the power supply, and 2J intermediate relay's normally open auxiliary contact is in the off-state, and audible-visual annunciator is unable to be electrified.
While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a rake protection device is prevented pressing by peripheral transmission thickener, includes the thickener body, its characterized in that: the device also comprises a PLC controller, a sensor, a driven wheel, an alarm and an intermediate relay; the driven wheel is connected with the driving wheel on the thickener body and synchronously rotates with the driving wheel; a sensor is arranged on the driven wheel; the sensor is connected with the PLC; the PLC is connected with the intermediate relay; the intermediate relay is connected with the alarm.
2. The rake-pressing prevention protection device of the peripheral transmission thickener according to claim 1, wherein: the driven wheel comprises a disc and a supporting arm, a plurality of through holes are formed in the periphery of the disc, and a center hole is formed in the center of the disc.
3. The rake-pressing prevention protection device of the peripheral transmission thickener of claim 2, wherein: the supporting arm comprises a head and a supporting rod, wherein the head is U-shaped and comprises two side plates and a connecting plate for connecting the two side plates, the disc is installed in the inner space of the U-shaped, and the disc is rotatably connected with the head.
4. The rake-pressing prevention protection device of the peripheral transmission thickener according to claim 3, wherein: the two side plates at the head of the supporting arm are symmetrically provided with mounting holes, a central shaft is arranged between the two mounting holes, and the central shaft also penetrates through the central hole of the disc.
5. The rake-pressing prevention protection device of the peripheral transmission thickener according to claim 3, wherein: and in the two side plates, only one side plate is provided with a detection hole, and the detection hole is used for installing a probe of the sensor.
6. The rake-pressing prevention protection device of the peripheral transmission thickener of claim 5, wherein: the positions of the detection holes are matched with the positions of the through holes on the disc, so that when the disc rotates, the probes arranged in the detection holes are sequentially aligned with the through holes.
7. The rake-pressing prevention protection device of the peripheral transmission thickener of claim 6, wherein: the sensor is a photoelectric sensor, and when the driven wheel rotates, different signals are generated according to whether the through hole passes through the probe or not.
8. The rake-pressing prevention protection device of the peripheral transmission thickener according to claim 7, wherein: the alarm is an audible and visual alarm.
9. A method for protecting a pressure-resistant rake of a peripheral transmission thickener is characterized in that the device of any one of claims 1 to 8 is adopted, and the method comprises the following steps:
s1, acquiring original parameters
Before formal use, acquiring original parameters for describing the rotation speed condition of a driving wheel of a thickener during normal operation, and connecting a driven wheel in the device with the driving wheel of the thickener to ensure that the driven wheel and the driving wheel of the thickener rotate synchronously; then, two different signals obtained by measurement are sent to a PLC controller through a sensor, the signals are analyzed by the PLC controller, the original alternate change time of the two signals sent by the sensor is obtained and recorded as t0;
s2, comparing the real-time measurement result with the original parameters
When in formal use; detecting by a sensor in real time, obtaining the alternating change time of a real-time signal, recording the time as tx, and comparing the tx with t0; making different decisions according to the comparison result;
if tx < = t0, the running of the thickener is normal, and other operations are not needed;
if tx is greater than t0, the load of the thickener is increased to a certain degree at the moment, so that the walking speed of the thickener is slowed, the thickener runs in an overload state, namely, the thickener is in an abnormal state, the PLC outputs a signal to the intermediate relay, and the intermediate relay is used for controlling the alarm to send out an alarm signal so as to remind a worker to carry out patrol processing.
10. The pressure rake protection method of the peripheral transmission thickener according to claim 9, wherein: the sensor is a photoelectric sensor, when the photoelectric sensor measures, the driven wheel rotates, and when a probe of the photoelectric sensor is aligned with a through hole of the driven wheel, the photoelectric sensor is in a disconnected state and sends a disconnection signal; when the probe of the photoelectric sensor is aligned with the solid part of the driven wheel, the photoelectric sensor is in a connection state and sends a connection signal, the photoelectric sensor transmits two signals sent by detection to the PLC, and the time of the two signals changing alternately is obtained after the signals are analyzed by the PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211083259.8A CN115337682A (en) | 2022-09-06 | 2022-09-06 | Pressure rake prevention protection device and method for peripheral transmission thickener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211083259.8A CN115337682A (en) | 2022-09-06 | 2022-09-06 | Pressure rake prevention protection device and method for peripheral transmission thickener |
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| CN115337682A true CN115337682A (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211083259.8A Pending CN115337682A (en) | 2022-09-06 | 2022-09-06 | Pressure rake prevention protection device and method for peripheral transmission thickener |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB789376A (en) * | 1954-07-09 | 1958-01-22 | Schenck Gmbh Carl | Device for the conversion of measuring values into electric impulses |
| CN1973946A (en) * | 2006-10-16 | 2007-06-06 | 太原理工大学 | Alarm device for servo pressure-preventing rake in thickener |
| CN201040685Y (en) * | 2006-07-31 | 2008-03-26 | 宝山钢铁股份有限公司 | Centralizing device for hoisting machinery |
| CN201899907U (en) * | 2010-10-25 | 2011-07-20 | 冯瑞波 | Fault monitoring device for traveling roller of thickener |
| CN203559223U (en) * | 2013-09-23 | 2014-04-23 | 嘉兴浩瀚电子技术推广有限公司 | Automatic reset device of probe of computerized flat knitting machine |
-
2022
- 2022-09-06 CN CN202211083259.8A patent/CN115337682A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB789376A (en) * | 1954-07-09 | 1958-01-22 | Schenck Gmbh Carl | Device for the conversion of measuring values into electric impulses |
| CN201040685Y (en) * | 2006-07-31 | 2008-03-26 | 宝山钢铁股份有限公司 | Centralizing device for hoisting machinery |
| CN1973946A (en) * | 2006-10-16 | 2007-06-06 | 太原理工大学 | Alarm device for servo pressure-preventing rake in thickener |
| CN201899907U (en) * | 2010-10-25 | 2011-07-20 | 冯瑞波 | Fault monitoring device for traveling roller of thickener |
| CN203559223U (en) * | 2013-09-23 | 2014-04-23 | 嘉兴浩瀚电子技术推广有限公司 | Automatic reset device of probe of computerized flat knitting machine |
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