CN112973989B - Vibration reduction method for spiral centrifugal machine without stopping - Google Patents
Vibration reduction method for spiral centrifugal machine without stopping Download PDFInfo
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- CN112973989B CN112973989B CN202110212126.5A CN202110212126A CN112973989B CN 112973989 B CN112973989 B CN 112973989B CN 202110212126 A CN202110212126 A CN 202110212126A CN 112973989 B CN112973989 B CN 112973989B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B15/00—Other accessories for centrifuges
- B04B15/06—Other accessories for centrifuges for cleaning bowls, filters, sieves, inserts, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B15/00—Other accessories for centrifuges
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Abstract
The invention provides a non-stop vibration damping method for a spiral centrifuge, which belongs to the technical field of centrifuges and comprises the following cleaning steps that in the running state of the spiral centrifuge, the introduction amount of centrifugal materials is reduced, cleaning liquid is introduced into a rotary drum, the reduction amount of the centrifugal materials is equal to the increase amount of the cleaning liquid in unit time until the introduction amount of the cleaning liquid reaches a preset value, the cleaning liquid is used for cleaning deposition materials in the rotary drum, after the introduction amount of the cleaning liquid reaches the preset value, the introduction amount of the cleaning liquid is reduced, the introduction amount of the centrifugal materials is increased, and the reduction amount of the cleaning liquid is equal to the increase amount of the centrifugal materials in unit time until the introduction of the cleaning liquid is stopped; the vibration reduction method for the spiral centrifuge without stopping provided by the invention can solve the technical problems that the material deposition in the rotary drum of the spiral centrifuge causes the machine body to vibrate greatly and the equipment needs to be started and stopped frequently.
Description
Technical Field
The invention belongs to the technical field of centrifuges, and particularly relates to a vibration reduction method for a spiral centrifuge without stopping.
Background
The horizontal spiral sedimentation centrifuge can be used for separating solid-liquid mixture, and the main structure of the horizontal spiral sedimentation centrifuge comprises a rotary drum and spiral blades concentrically arranged in the rotary drum. After the solid-liquid mixture enters the rotary drum, under the action of centrifugal force generated by high-speed rotation, solid-phase particles with large specific gravity are deposited on the inner wall of the rotary drum, the solid-phase particles deposited on the inner wall of the rotary drum are continuously scraped by the helical blade moving relative to the rotary drum and are pushed out of a slag discharge port, and the separated liquid phase is discharged from a clear liquid outlet. After the centrifuge runs for a period of time, solid-phase particles can be deposited between the rotary drum and the spiral blades, the gravity center of the centrifuge deviates from the rotary axis, and the centrifuge can vibrate greatly during high-speed rotation to cause serious damage to equipment, and at the moment, the centrifuge needs to be stopped for processing, the equipment is frequently started, the equipment is damaged, and the production efficiency is reduced.
Disclosure of Invention
The invention aims to provide a non-stop vibration reduction method for a spiral centrifuge, and aims to solve the technical problems that a machine body vibrates greatly due to material deposition in a rotary drum of the spiral centrifuge and equipment needs to be started and stopped frequently.
In order to achieve the purpose, the invention adopts the technical scheme that: the non-stop vibration reduction method for the spiral centrifuge comprises the following cleaning steps:
reducing the introduction amount of centrifugal materials in the operating state of the spiral centrifugal machine, and introducing cleaning liquid into the rotary drum, wherein the reduction amount of the centrifugal materials is equal to the increase amount of the cleaning liquid in unit time until the introduction amount of the cleaning liquid reaches a preset value, and the cleaning liquid is used for cleaning deposited materials in the rotary drum;
and after the introduction amount of the cleaning liquid reaches a preset value, reducing the introduction amount of the cleaning liquid, and increasing the introduction amount of the centrifugal material, wherein the reduction amount of the cleaning liquid is equal to the increase amount of the centrifugal material in unit time until the introduction of the cleaning liquid is stopped.
Further, the vibration amplitude of the spiral centrifuge is monitored, and when the vibration amplitude reaches a preset upper limit value, the cleaning step is started.
And further, when the vibration amplitude exceeds the upper limit value, recording alarm time, and judging whether the spiral centrifugal machine needs to be overhauled or not through a plurality of intervals of the alarm time.
Further, the cleaning step is actively started at set time intervals.
Furthermore, the centrifugal material and the cleaning liquid are introduced into the rotary drum by pipelines, the introduction amount of the centrifugal material and the cleaning liquid is controlled by respective flow and introduction time, and the change of the introduction amount of the centrifugal material and the cleaning liquid is realized by the gradual change of the flow.
Further, the centrifugal materials are introduced into the rotary drum through a feeding pipeline, a feeding adjusting valve is arranged on the feeding pipeline, and the feeding adjusting valve is used for controlling the flow of the centrifugal materials;
the cleaning liquid is introduced into the rotary drum through a cleaning pipeline, a cleaning regulating valve is arranged on the cleaning pipeline, and the cleaning regulating valve is used for controlling the flow of the cleaning liquid.
Furthermore, the spiral centrifuge monitors the vibration amplitude of the spiral centrifuge through a vibration sensor, the vibration sensor is electrically connected with the signal input end of the PLC, the signal output end of the PLC is electrically connected with the feeding adjusting valve and the cleaning adjusting valve, and the PLC controls the opening degrees of the feeding adjusting valve and the cleaning adjusting valve in an interlocking manner.
Furthermore, be equipped with on the feed line and be used for detecting the first mass flowmeter of the quality of centrifugation material, be equipped with on the purge line and be used for detecting the second mass flowmeter of the quality of washing liquid, first mass flowmeter and second mass flowmeter all electricity are connected the signal input part of PLC controller.
Furthermore, the feeding pipeline is connected in parallel with a first bypass system capable of being operated manually, and the first bypass system is used for introducing the centrifugal materials into the rotary drum.
Furthermore, the cleaning pipeline is connected in parallel with a second bypass system capable of being operated manually, and the second bypass system is used for introducing the cleaning liquid into the rotary drum.
Compared with the prior art, the non-stop cleaning of the spiral centrifuge is realized through the cleaning steps, so that deposited materials in the rotary drum can be removed, the phenomenon that the deposited materials cause gravity center shift to cause large-amplitude vibration is prevented, and the aim of vibration reduction is fulfilled; the potential accidents of increasing the current of a main motor of the centrifugal machine, exceeding the standard of the load of a differential mechanism and the like can be prevented by eliminating the deposited materials in the rotary drum; in the cleaning process, in the former stage, the centrifugal materials entering the rotary drum are reduced, and the cleaning liquid is increased in an equivalent manner until the cleaning liquid cleans the deposited materials, in the latter stage, the cleaning liquid entering the rotary drum is reduced, the centrifugal materials are increased in an equivalent manner until the cleaning liquid is stopped to be introduced, and the centrifugal machine is recovered to a normal working state; in the process, the quality of the solid-liquid mixture in the rotary drum is kept unchanged, and the solid-liquid mixture is in a stable annular form under the action of centrifugal force, so that the centrifugal machine is ensured to be always in a dynamic balance state, and the phenomenon that the annular form is damaged to cause large vibration is avoided; the vibration reduction method provided by the invention not only can be used for cleaning the interior of the rotary drum without stopping the machine and eliminating large-amplitude vibration caused by deposited materials, but also can be used for well maintaining the annular form of a solid-liquid mixture in the rotary drum in the cleaning process, preventing the large-amplitude vibration caused by breaking of the dynamic balance of the centrifuge, ensuring that the centrifuge can continuously run without frequent starting and stopping, prolonging the service life of the centrifuge, improving the production efficiency and reducing the maintenance cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic application diagram of a vibration reduction method for a screw centrifuge without shutdown according to an embodiment of the present invention.
In the figure: 11. a drum; 12. a main motor; 13. a differential mechanism; 14. a helical blade; 15. a housing; 16. a slag discharge port; 17. a clear liquid outlet; 2. a feed line; 21. a feed regulating valve; 22. a first mass flow meter; 3. cleaning a pipeline; 31. cleaning the regulating valve; 32. a second mass flow meter; 4. a vibration sensor; 5. a PLC controller.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a method for damping vibration of a screw centrifuge according to the present invention without stopping the centrifuge will now be described. The vibration reduction method of the spiral centrifuge without stopping comprises the following cleaning steps;
reducing the introduction amount of the centrifugal materials in the operating state of the spiral centrifuge, introducing a cleaning solution into the rotary drum 11, wherein the reduction amount of the centrifugal materials is equal to the increase amount of the cleaning solution in unit time until the introduction amount of the cleaning solution reaches a preset value, and the cleaning solution is used for cleaning the deposited materials in the rotary drum 11;
and after the introduction amount of the cleaning liquid reaches a preset value, reducing the introduction amount of the cleaning liquid, and increasing the introduction amount of the centrifugal material, wherein the reduction amount of the cleaning liquid is equal to the increase amount of the centrifugal material in unit time until the introduction of the cleaning liquid is stopped.
Compared with the prior art, the non-stop cleaning of the spiral centrifuge is realized through the cleaning steps, so that deposited materials in the rotary drum 11 can be removed, the phenomenon that the deposited materials cause gravity center shift to cause large-amplitude vibration is prevented, and the aim of vibration reduction is fulfilled; the potential accidents that the current of a main motor 12 of the centrifugal machine is increased, the load of a differential mechanism 13 exceeds the standard and the like can be prevented by eliminating the deposited materials in the rotary drum 11; in the cleaning process, in the former stage, the centrifugal materials entering the rotary drum 11 are reduced, and the cleaning liquid is increased in an equivalent manner until the cleaning liquid cleans the deposited materials, in the latter stage, the cleaning liquid entering the rotary drum 11 is reduced, and the centrifugal materials are increased in an equivalent manner until the cleaning liquid is stopped to be introduced, and the centrifugal machine is recovered to a normal working state; in the process, the mass of the solid-liquid mixture in the rotary drum 11 is kept unchanged, and the solid-liquid mixture is in a stable annular form under the action of centrifugal force, so that the centrifugal machine is ensured to be always in a dynamic balance state, and the annular form cannot be damaged to cause large vibration; the non-stop vibration reduction method provided by the invention not only can be used for cleaning the interior of the rotary drum 11 without stopping the machine and eliminating large-amplitude vibration caused by deposited materials, but also can be used for well maintaining the annular form of a solid-liquid mixture in the rotary drum 11 in the cleaning process, preventing the dynamic balance of the centrifugal machine from being broken to cause large-amplitude vibration, ensuring that the centrifugal machine can continuously run without frequent starting and stopping, prolonging the service life of the centrifugal machine, improving the production efficiency and reducing the maintenance cost.
When the centrifuge is in a normal working state, the centrifugal material is continuously introduced into the rotary drum 11, and the cleaning solution is not introduced at the moment; after the cleaning step is started, the introduction amount of the centrifugal materials is reduced, and the introduction amount of the cleaning liquid is increased in an equivalent manner until the deposited materials are completely cleaned; then, the introduction amount of the cleaning liquid is reduced, the introduction amount of the centrifugal material is increased in an equivalent manner until the cleaning liquid is not introduced any more, the centrifugal material is introduced according to a normal flow, and the centrifuge is recovered to a normal working state. In the whole process, the centrifuge is always in the running state, the quality of the solid-liquid mixture in the rotary drum 11 is kept unchanged, and the annular shape is well maintained.
In the face of the problem of material deposition inside the rotary drum 11, the general practice in the prior art is to stop the machine, and then to clean the machine by disassembling the centrifugal machine or a special structure arranged on the centrifugal machine in advance, which not only wastes time and labor, but also seriously damages the service life of key parts such as a bearing assembly and the like along with a period of large-amplitude vibration in the starting and stopping process of the centrifugal machine, and further increases the maintenance cost of the centrifugal machine. The shutdown can also seriously affect the utilization rate of the centrifugal machine and cause great loss for enterprises. In addition, in the prior art, a buffer structure is often adopted for large-amplitude vibration in the starting and stopping processes of the centrifugal machine, but the method is not the cause of symptoms and root causes, and only can weaken the transmission and destructive force of the vibration, but cannot fundamentally prevent the generation of the large-amplitude vibration.
The non-stop vibration reduction method provided by the invention not only eliminates the large vibration of the centrifuge, but also can be matched with an automatic system to realize the continuous production of the centrifuge, thereby greatly reducing the manpower and capital cost required to be invested in the overhaul and maintenance of the centrifuge and having good popularization and application prospects.
The vibration reduction method without stopping the machine can be widely applied to various types of spiral centrifuges, such as a vertical spiral centrifuge, a horizontal spiral centrifuge, a sedimentation type spiral centrifuge, a filtering type spiral centrifuge and a scraper type spiral centrifuge. Fig. 1 shows a usage scenario of a vibration reduction method without stopping a horizontal spiral sedimentation screen centrifuge as an example. The main motor 12 provides power to rotate the rotary drum 11 and the helical blades 14 through the differential 13. The rotary drum 11 is connected with a shell of a differential 13, the helical blade 14 is connected with a rotating shaft of the differential 13, and the rotary drum 11 and the helical blade 14 have relative motion. The centrifugal material is introduced into the rotary drum 11 through a pipeline and rotates at a high speed under the driving of the rotary drum 11 to realize solid-liquid separation, a solid phase part is discharged from a slag discharge port 16 arranged on the casing 15, and a separated liquid phase is discharged from a clear liquid outlet 17 arranged on the casing 15.
Specifically, the cleaning solution may be one or more of methanol, ethanol, chemical primary water and soft water. After entering the drum 11, the cleaning liquid can clean the deposited materials through dissolving, scouring and other modes.
As a specific implementation mode of the vibration reduction method for the screw centrifuge without stopping the machine, the vibration amplitude of the screw centrifuge is monitored, and when the vibration amplitude reaches a preset upper limit value, a cleaning step is started.
During the operation of the spiral centrifugal machine, vibration cannot be avoided, but the vibration cannot cause great influence on the equipment as long as the vibration is controlled within an acceptable range, so that the normal operation of the equipment is ensured.
When the vibration amplitude reaches a preset upper limit value, although the spiral centrifugal machine can still work, the deposited materials are formed in the rotary drum 11 at the moment, if the deposited materials are left alone, the mass of the deposited materials is larger and larger, and finally the vibration degree of the equipment exceeds the standard. Therefore, when the vibration amplitude reaches the upper limit value, the cleaning is started in time to clean the deposited materials in the rotary drum 11, so that the vibration is kept within an acceptable range.
As a specific implementation mode of the vibration reduction method for the non-stop spiral centrifuge, when the vibration amplitude exceeds the upper limit value, the alarm time is recorded, and whether the spiral centrifuge needs to be overhauled or not is judged according to the interval of a plurality of alarm times.
In the process of implementing the invention, the inventor finds that if mechanical parts of the spiral centrifugal machine work normally, the time interval of the occurrence of the problem of excessive vibration caused by deposited materials is kept unchanged, namely the time interval of the vibration amplitude exceeding the upper limit value (alarm time) is kept unchanged.
When the interval of the alarm time is reduced to a certain degree and the alarm frequency is too high, the mechanical parts of the spiral centrifugal machine are indicated to have problems, the vibration of the equipment is induced to exceed the standard, and the spiral centrifugal machine needs to be overhauled at the moment to eliminate the problems of the mechanical parts. Specifically, the maintenance includes maintenance without shutdown and shutdown maintenance according to the degree of reduction of the alarm time interval.
The embodiment provides a method for determining the overhauling time of a spiral centrifuge. The problem that plagues the industry has been when screw centrifuges are overhauled. The spiral centrifugal machine is complex in structure, the rotating drum 11 is in a high-speed running state during running, when vibration exceeding the standard occurs to equipment, technicians often cannot accurately find out the reason, and therefore whether maintenance is needed or not can not be accurately judged, and maintenance frequency is often determined blindly according to experience.
The spiral centrifugal machine has a complex structure, is difficult to disassemble and high in maintenance cost, and can bring heavy burden to enterprises if the maintenance is too frequent; however, if the maintenance frequency is not in place, the spiral centrifugal machine generates great damage to equipment once large-amplitude vibration occurs, the service life of the spiral centrifugal machine is shortened, and loss is caused to enterprises.
According to the non-stop vibration reduction method provided by the invention, the vibration exceeding caused by the deposited materials in the rotary drum 11 can be eliminated by introducing cleaning; in the cleaning process, the solid-liquid mixture in the rotary drum 11 maintains an annular shape, and the vibration exceeding caused by the damage of the dynamic balance of the centrifugal machine is eliminated, so that the reason of the vibration exceeding is positioned on mechanical parts, and whether the mechanical parts of the spiral centrifugal machine have problems or not is judged according to the frequency of the alarm time, so that the maintenance opportunity is reasonably determined, the maintenance cost is greatly reduced, the service life of the spiral centrifugal machine is prolonged, and unnecessary loss of enterprises is avoided.
As a specific implementation mode of the vibration reduction method for the screw centrifuge without stopping the machine, the cleaning step is actively started according to a set time interval.
Compared with the method that the vibration amplitude of the spiral centrifugal machine is monitored, when the vibration amplitude exceeds the upper limit value, the cleaning step is started (passively started), the active starting mode is provided in the embodiment, the cleaning step can be started actively when the set time is reached, the deposited materials are eliminated in the growth process of the deposited materials, and the situation that the vibration exceeds the standard is prevented in advance.
The time interval of active start needs to be set according to the property of the centrifugal material. For example, when solid-phase particles in the centrifugal material are easy to accumulate and form deposits, or the concentration of the solid-phase material is high and the centrifugal material is thick, the time interval of active start needs to be properly shortened, and the cleaning frequency needs to be increased.
The active start-up mode provided by the present embodiment and the passive start-up mode provided by the foregoing embodiments may be applied separately or simultaneously.
As a specific implementation mode of the non-stop vibration reduction method of the spiral centrifuge, the centrifugal material and the cleaning liquid are introduced into the rotary drum 11 by pipelines, the introduction amount of the centrifugal material and the cleaning liquid is controlled by respective flow and introduction time, and the change of the introduction amount of the centrifugal material and the cleaning liquid is realized by gradually changing the flow.
After the cleaning step is started, the introduction flow of the centrifugal material is reduced, the introduction flow of the cleaning solution is increased (from zero), and the flows of the centrifugal material and the cleaning solution are gradually changed, so that the components of the solid-liquid mixture in the rotary drum 11 are gradually changed, and the annular form of the solid-liquid mixture is prevented from being damaged by sudden change; the quality of the centrifugal materials in the solid-liquid mixture is gradually reduced, and the quality of the cleaning solution is gradually increased, so that the deposited materials are cleaned; the preset value of the cleaning liquid feeding amount can be controlled by time, and the feeding amount of the cleaning liquid is considered to reach the preset value after the cleaning liquid is fed for a certain time, at this time, the flow of the cleaning liquid may reach the maximum value and is maintained for a period of time, or the flow of the cleaning liquid may not reach the maximum value. The preset value of the cleaning liquid feeding amount is set according to the property of the centrifugal material.
After the deposited materials are cleaned, the flow of the cleaning liquid is gradually reduced, the flow of the centrifugal materials is gradually increased (from zero or not) until the flow of the cleaning liquid is reduced to zero, and the flow of the centrifugal materials is increased to a value when the centrifugal machine is in a normal working state.
In order to maintain the annular form of the solid-liquid mixture in the drum 11, the mass of the solid-liquid mixture is generally kept constant; the mass of the centrifugal material and the cleaning fluid is equal to the product of the flow rate and the density of the centrifugal material and the cleaning fluid, and the flow rate is the volume of the fluid passing through the section in unit time; according to the density of the centrifugal material and the cleaning liquid, the mass of the solid-liquid mixture can be kept unchanged by reasonably controlling the increase and decrease of the flow of the centrifugal material and the cleaning liquid.
In addition to maintaining the mass constant, the volume of the solid-liquid mixture may also be maintained constant, depending on the nature of the material being centrifuged and the operating parameters of the screw centrifuge. The technical scheme that the annular shape of the solid-liquid mixture in the rotary drum 11 is not changed can be obtained without creative work and is within the protection scope of the invention.
As a specific embodiment of the vibration reduction method for the screw centrifuge without stopping the machine, please refer to fig. 1, a centrifugal material is introduced into a rotating drum 11 through a feeding pipeline 2, a feeding regulating valve 21 is arranged on the feeding pipeline 2, and the feeding regulating valve 21 is used for controlling the flow rate of the centrifugal material; the cleaning liquid is introduced into the rotary drum 11 through the cleaning pipeline 3, the cleaning pipeline 3 is provided with a cleaning regulating valve 31, and the cleaning regulating valve 31 is used for controlling the flow of the cleaning liquid.
The existing spiral centrifugal machine is generally provided with a feeding pipeline 2 and a feeding regulating valve 21, when the non-stop vibration reduction method provided by the invention is applied, only a cleaning pipeline 3 connected with the feeding pipeline 2 in parallel is needed, the reconstruction cost is extremely low, the produced beneficial effect is extremely large, the maintenance cost of the spiral centrifugal machine is greatly reduced, the spiral centrifugal machine can be continuously produced, and the huge economic benefit is produced.
The feeding pipeline 2 is connected with a centrifugal material source, and the cleaning pipeline 3 is connected with a cleaning liquid source; there is vibration of certain degree in the screw centrifuge operation process, so the one end that feed line 2 and cleaning tube way 3 and screw centrifuge are connected all need to adopt the flexible coupling mode. The feed regulating valve 21 and the cleaning regulating valve 31 can change the flow of the centrifugal material and the cleaning liquid by adjusting the opening degree. The feed regulating valve 21 and the purge regulating valve 31 can be obtained by procurement using the prior art. The feed regulating valve 21 may be an electrically operated on-off regulating valve manufactured by Zhejiang bell valve Co., Ltd., model GYL40900-DN 80. The purge control valve 31 may be an electric on-off control valve manufactured by beige valves ltd, zhejiang, and having a model number of GYL40900-DN 100.
Referring to fig. 1, the spiral centrifuge monitors its own vibration amplitude through the vibration sensor 4, the vibration sensor 4 is electrically connected to a signal input end of the PLC controller 5, a signal output end of the PLC controller 5 is electrically connected to the feed regulating valve 21 and the cleaning regulating valve 31, and the PLC controller 5 controls the opening degrees of the feed regulating valve 21 and the cleaning regulating valve 31 in an interlocking manner.
Through the vibration sensor 4, the PLC 5 can know whether the vibration amplitude of the spiral centrifuge reaches a preset upper limit value, and if the vibration amplitude reaches the preset upper limit value, the PLC 5 can control the feeding adjusting valve 21 and the cleaning adjusting valve 31 to automatically start the cleaning step; during the cleaning process, the PLC controller 5 gradually adjusts the openings of the feed regulating valve 21 and the cleaning regulating valve 31 to increase or decrease the flow rate. I.e. the passive start of the washing step can be automatically achieved by the PLC controller 5.
The active start of the cleaning step can be automatically realized through the PLC 5, only the start time needs to be set in the program loaded into the PLC 5, and after the time is reached, the PLC 5 can automatically control the feed regulating valve 21 and the cleaning regulating valve 31 to start the cleaning without stopping.
The PLC 5 controls the feeding regulating valve 21 and the cleaning regulating valve 31 in an interlocking way, namely the opening of one regulating valve is increased while the opening of the other regulating valve is reduced, and the openings of the two regulating valves are not increased or reduced simultaneously, so that the material amount entering the rotary drum 11 is controlled to be unchanged, and the annular form of the solid-liquid mixture is maintained.
The PLC controller 5 is a programmable logic controller, which is a digital arithmetic operation electronic system designed specifically for automation control in an industrial environment, and is a conventional technology. The PLC controller 5 includes a CPU, a memory, an input/output unit, a power supply module, an analog module, and the like. The PLC controller 5 may be selected from the model S7-200 manufactured by siemens. The vibration sensor 4 can also be obtained by purchasing by using the prior art; for example, a product model ST-3FB manufactured by the Houston Automation instrumentation group Co., Ltd may be used.
The vibration amplitude detected by the vibration sensor 4 can be converted into current or voltage and transmitted to the PLC controller 5 as analog quantity, and the PLC controller 5 can know the vibration amplitude according to the analog quantity. Likewise, the PLC controller 5 may send analog quantities to the regulating valves to control their opening degrees.
Besides the PLC 5, the automatic system also comprises a human-computer interface, various instruments and meters and the like, so that the automatic and continuous operation of the spiral centrifuge can be realized, manual intervention is basically not needed, and the labor cost is reduced. For example, the active start-up time interval of the non-stop cleaning is set to be 3 hours, and the time for starting the cleaning pipeline 3 every time is 80 seconds, namely, the cleaning step is performed every 3 hours to clean the deposited materials in the rotary drum 11.
Referring to fig. 1, a first mass flow meter 22 for detecting the mass of a centrifugal material is arranged on a feeding pipeline 2, a second mass flow meter 32 for detecting the mass of a cleaning liquid is arranged on a cleaning pipeline 3, and both the first mass flow meter 22 and the second mass flow meter 32 are electrically connected with a signal input end of a PLC controller 5.
Mass flowmeters can detect the instantaneous flow of a fluid and also record the cumulative flow. The mass flow meter is used for forming closed-loop control and monitoring whether the sum of the mass of the centrifugal material and the cleaning liquid introduced into the rotary drum 11 is kept unchanged in unit time. That is, in order to maintain the annular form of the solid-liquid mixture in the drum 11, the sum of the instantaneous flow rates of the first mass flow meter 22 and the second mass flow meter 32 must be kept constant during the cleaning process, and if there is a change exceeding the expected value, it means that the adjustment amount is deviated and it is necessary to adjust in time.
In practical application, the open loop control composed of the PLC controller 5 and the regulating valve can generally meet the requirement, that is, the opening degrees of the feeding regulating valve 21 and the cleaning regulating valve 31 are adjusted by the calculation of the PLC controller 5, so that the sum of the mass of the centrifugal material and the cleaning liquid introduced into the rotary drum 11 in unit time is basically kept unchanged, and the requirement is met. Although mass flow meters are state of the art, procurement costs are high. The addition of a mass flow meter allows for closed loop control, which makes the control process more accurate, but adds cost and can be selected as appropriate.
As a specific embodiment of the vibration reduction method for the screw centrifuge without stopping the machine, the feeding pipeline is connected in parallel with a first bypass system which can be operated manually and is used for introducing centrifugal materials into the rotary drum 11. When feeding pipeline 2 goes wrong, can in time switch to first bypass system to can be on the basis that does not influence the operation of screw centrifuge, conveniently overhaul the feeding pipeline 2 and maintain.
As a specific implementation manner of the vibration reduction method for the screw centrifuge without stopping the machine, the cleaning pipeline is connected in parallel with a second bypass system capable of being operated manually, and the second bypass system is used for introducing the cleaning liquid into the rotary drum 11. When the cleaning pipeline 3 has a problem, the cleaning pipeline can be switched to the second bypass system in time, so that the occurrence of a larger equipment accident caused by untimely cleaning is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The vibration reduction method without stopping the spiral centrifuge is characterized by comprising the following cleaning steps of:
reducing the introduction amount of centrifugal materials in the operating state of the spiral centrifugal machine, and introducing cleaning liquid into the rotary drum, wherein the reduction amount of the centrifugal materials is equal to the increase amount of the cleaning liquid in unit time until the introduction amount of the cleaning liquid reaches a preset value, and the cleaning liquid is used for cleaning deposited materials in the rotary drum;
and after the introduction amount of the cleaning liquid reaches a preset value, reducing the introduction amount of the cleaning liquid, and increasing the introduction amount of the centrifugal material, wherein the reduction amount of the cleaning liquid is equal to the increase amount of the centrifugal material in unit time until the introduction of the cleaning liquid is stopped.
2. A method of vibration reduction in a screw centrifuge without shutdown in accordance with claim 1, wherein the vibration amplitude of said screw centrifuge is monitored and said cleaning step is initiated when said vibration amplitude reaches a preset upper limit value.
3. A method for vibration reduction of a screw centrifuge according to claim 2, wherein an alarm time is recorded when said vibration amplitude exceeds said upper limit value, and whether said screw centrifuge needs to be overhauled or not is judged by a plurality of intervals of said alarm time.
4. A method of vibration reduction in a screw centrifuge without shutdown, as recited in claim 1, wherein said cleaning step is actively initiated at set time intervals.
5. A vibration damping method for a screw centrifuge without stopping the machine as claimed in claim 1, wherein said centrifuge material and said cleaning liquid are introduced into said drum by means of pipes, the introduction amount of said centrifuge material and said cleaning liquid is controlled by the flow rate and the introduction time of each, and the change of the introduction amount of said centrifuge material and said cleaning liquid is realized by the gradual change of the flow rate.
6. A vibration reduction method of a spiral centrifuge without stopping the machine, which is characterized in that the centrifugal materials are introduced into the rotary drum through a feeding pipeline, a feeding regulating valve is arranged on the feeding pipeline, and the feeding regulating valve is used for controlling the flow of the centrifugal materials;
the cleaning liquid is introduced into the rotary drum through a cleaning pipeline, a cleaning regulating valve is arranged on the cleaning pipeline, and the cleaning regulating valve is used for controlling the flow of the cleaning liquid.
7. The method for vibration reduction of the screw centrifuge without stopping the machine according to claim 6, wherein the screw centrifuge monitors the vibration amplitude of the screw centrifuge by a vibration sensor, the vibration sensor is electrically connected with a signal input end of a PLC controller, a signal output end of the PLC controller is electrically connected with the feeding regulating valve and the cleaning regulating valve, and the PLC controller controls the opening degrees of the feeding regulating valve and the cleaning regulating valve in an interlocking manner.
8. The vibration reduction method of the spiral centrifuge without stopping the machine according to claim 7, wherein a first mass flow meter for detecting the mass of the centrifugal material is arranged on the feeding pipeline, a second mass flow meter for detecting the mass of the cleaning liquid is arranged on the cleaning pipeline, and both the first mass flow meter and the second mass flow meter are electrically connected with the signal input end of the PLC controller.
9. A method of vibration reduction in a screw centrifuge without shutdown in accordance with claim 6 wherein said feed line is connected in parallel with a manually operable first bypass system for passing said centrifuged material into said bowl.
10. A vibration reduction method for a screw centrifuge without stopping the machine according to claim 6, wherein said cleaning pipeline is connected in parallel with a second bypass system capable of being operated manually, said second bypass system being used for introducing said cleaning liquid into said bowl.
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|---|---|---|---|
| CN202110212126.5A CN112973989B (en) | 2021-02-25 | 2021-02-25 | Vibration reduction method for spiral centrifugal machine without stopping |
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| JPH08131889A (en) * | 1994-11-10 | 1996-05-28 | Nkk Corp | Screw decanter type centrifugal separating machine |
| CN203380011U (en) * | 2013-07-26 | 2014-01-08 | 开封万盛新材料有限公司 | Automatic feeding control device for decanter centrifuge |
| CN104959244A (en) * | 2015-07-23 | 2015-10-07 | 柳州永生好茶油有限公司 | Automatic cleaning-type centrifuge used for producing tea oil |
| CN108722689B (en) * | 2018-07-02 | 2024-08-20 | 南京中船绿洲机器有限公司 | Anti-blocking system of nozzle type disc separator and control method thereof |
| CN208771641U (en) * | 2018-07-23 | 2019-04-23 | 苏州优耐特机械制造有限公司 | A kind of horizontal spiral centrifuge that can clear up putty automatically |
| CN109127168A (en) * | 2018-07-24 | 2019-01-04 | 南京中船绿洲机器有限公司 | A kind of control method based on disk centrifugal separator deslagging |
| CN111359787A (en) * | 2020-02-25 | 2020-07-03 | 河北首朗新能源科技有限公司 | Automatic cleaning device and cleaning control method for horizontal centrifuge |
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