Automatic control device of centrifugal machine
By designing automated control devices in the centrifuge, including hydraulic systems and visual monitoring systems, the problems of blockage and uneven iodine content during dehydration are solved, and the automatic operation and production stability of the centrifuge is achieved, reducing labor costs and failures Rate.
Patent Information
- Application Number
- CN202420860975.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-24
AI Technical Summary
Existing centrifuges are prone to clogging during the dehydration process, resulting in production interruptions and uneven iodine content. They also lack systematic monitoring and automated control, resulting in high labor intensity and frequent failures for workers.
An automated control device for centrifuge is designed, including hydraulic oil tank, oil pump, main motor, multi-channel cleaning device and visual monitoring system. The internal condition of the centrifuge is monitored through brine and white water flushing pipelines, pneumatic regulating valves and automatic control systems. Discover and deal with blockages in a timely manner to reduce failure rates and labor costs.
The automatic operation of the centrifuge is realized, the clogging failure rate is reduced, the production stability is improved, labor costs are reduced, and the precise control of iodine content and product quality is ensured.
Smart Images
Figure CN222240781U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a centrifuge for processing salt slurry, in particular to an automation transformation for improving the continuous working performance of the centrifuge. Background Art
[0002] The modern well salt production process mainly includes brine extraction, evaporation, drying, packaging and other main processes. Among them, the drying process usually uses a centrifuge to separate most of the water and salt sand in the salt slurry, reducing the moisture content of the salt sand from about 60% to about 2.5%, and then sending the salt sand to a boiling drying bed for drying. The final refined salt has a moisture content of less than 0.3%.
[0003] During the dehydration process of the centrifuge, its operating procedures require that the centrifuge drum be regularly flushed, otherwise finer salt crystals or other impurities will block the screen over a large area, causing production accidents (the centrifugal dehydration is interrupted, the salt slurry cannot be dehydrated to form salt cakes, and directly flows into the discharge pipe in the form of salt slurry to enter the next process), interrupting the continuous salt production process. In addition, it has been observed that salt slurry with a low water content tends to aggregate into lumps, and under the bonding effect of impurities such as gypsum, salt crystals will adhere to the discharge pipe of the centrifuge, causing the discharge pipe to be blocked.
[0004] At present, dual centrifuges are connected in parallel to the production line to ensure that the flushing of the centrifuge will not interrupt the salt production process. Flushing mainly includes regular observation flushing and fault handling flushing. Due to the lack of systematic monitoring and processing of centrifuges, the current working method is to manually flush the blocked part of the centrifuge to remove the blockage after the blockage is found. The disadvantages are: first, the blockage phenomenon is frequent, and the labor cost of special personnel to take care of the centrifuge is high. It takes about 5-8 times per shift (8 hours). Each time the blockage is cleared, it takes about 15 minutes to stop and clean. The labor intensity of the workers is also very high; second, when the blockage is found by the naked eye, the blockage is often very serious. The salt slurry has filled the centrifuge and gushed out. At this time, cleaning will not only cause a large amount of waste of salt slurry, but also the discontinuous production will have a great impact on the accuracy of the iodine content in the subsequent iodine addition work, which may cause uneven iodine content or even substandard.
[0005] CN217663952U discloses a method of cleaning the centrifuge discharge port by using an air hammer, which has a certain cleaning effect, but the knocking position is fixed, and can only clean the discharge port to prevent blockage there, and cannot clean the inside of the centrifuge, the front and middle sections of the feed pipe, and the salt sand attached to the pipe wall. Therefore, it is necessary to further systematically improve the salt slurry centrifuge to reduce the labor intensity of workers, reduce the blockage failure rate of the centrifuge, avoid shutdown due to fault handling, and affect the control of iodine content in refined salt. Utility Model Content
[0006] After long-term observation by the inventor of the utility model, the technical problem to be solved by the utility model is to provide a centrifuge automatic control device, in which the flushing pipeline is reasonably arranged and can comprehensively flush possible blockage points, thereby reducing the blockage failure rate of the centrifuge and facilitating the continuous and stable operation of the production line.
[0007] The utility model solves the technical problem by adopting the following technical scheme: a centrifuge automatic control device comprises a centrifuge and an outer wall of a drum thereof, a hydraulic oil tank, an oil pump and a main motor configured for the centrifuge, a feed flow regulating valve is arranged on the feed pipe of the centrifuge, the centrifuge is equipped with a multi-channel cleaning device, the multi-channel cleaning device comprises a brine flushing pipeline connected with the clean brine and a white water flushing pipeline connected with the water source, the outlet of the brine flushing pipeline is arranged on the feed pipe in front of the feed flow regulating valve, the white water flushing pipeline comprises a bottom net flushing pipeline for flushing the bottom net of the centrifuge drum, a surface net flushing pipeline for flushing the surface net of the centrifuge drum and a down pipe flushing pipeline for flushing the down pipe of the centrifuge, the control valves of the above flushing pipelines adopt pneumatic regulating valves and the pneumatic regulating valves are controlled by an automatic control system.
[0008] Furthermore, the invention also includes a visual monitoring system, which includes a camera, a mirror flushing device, a transparent mirror, and a fill light. The camera is installed outside the door of the centrifuge, the camera lens and the fill light are aimed at the inside of the centrifuge, the transparent mirror is embedded in the door of the centrifuge, the camera and the inside of the centrifuge are separated by a transparent mirror, the mirror flushing device acts on the transparent mirror, the mirror flushing device includes a mirror flushing pipeline connected to a water source, and the control valve of the mirror flushing pipeline adopts a pneumatic regulating valve and controls the pneumatic regulating valve through an automatic control system. The transparent mirror is embedded in the door of the centrifuge, the camera installation position is selected outside the door of the centrifuge, the camera and the inside of the centrifuge are separated by a transparent mirror, and the mirror flushing pipeline is used to ensure that the camera can reflect the internal situation of the centrifuge in real time, which is convenient for remote observation and control processing.
[0009] Furthermore, a pressure monitor and a current monitor are provided for the oil pump, an oil temperature monitor and an oil level monitor are provided for the hydraulic oil tank, a second current monitor and a vibration monitor are provided for the main motor; a second vibration monitor is provided on the outer wall of the centrifuge drum, and the above monitors are connected to the automatic control system signal. The inventor of the utility model found that if the hydraulic oil supply of the centrifuge is abnormal, it will cause the centrifuge to be blocked. If the centrifuge is blocked, the centrifuge will continue to work, which will cause the main motor to vibrate or the output current to increase abnormally, and the outer wall of the centrifuge will vibrate abnormally. By monitoring the hydraulic oil tank, oil pump, and main motor of the centrifuge accordingly, the abnormal working condition of the centrifuge can be discovered early to avoid serious blockage and machine damage.
[0010] Furthermore, a white water inlet branch equipped with a white water regulating valve is connected in parallel to the brine flushing pipeline, allowing white water to flow into the centrifuge through the feed pipe to dissolve salt crystals and some impurities, dilute the salt slurry inside the entire body, and thus achieve the purpose of rapid blockage removal.
[0011] Furthermore, after the flushing pipeline of the feed pipe is split, two water outlets are arranged inside the feed pipe and are staggered in radial direction of the feed pipe.
[0012] The beneficial effects of the utility model are as follows: by adding a cleaning pipeline to solve the blockage problem, and using a visual monitoring system to remotely view the actual working situation, corresponding monitors are arranged on key components of the centrifuge, and the operation of the centrifuge can be fully controlled with the help of an automated device, thereby improving the production stability of the centrifuge, so that the centrifuge for salt production can basically achieve unmanned normal operation, reducing the manpower cost and labor intensity of the centrifuge job positions, and facilitating the quality control of subsequent processing procedures. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is the overall structure and principle diagram of the automatic control device of the centrifuge of the utility model.
[0014] The markings in the figure are: 1-centrifuge, 2-feeding pipe, 4-automatic control system, 5-oil pump, 6-main motor, 8-feeding pipe, 9-feeding pipe conversion cylinder, 10-main motor, 11-drum outer wall, 12-door, 13-first-stage drum, 14-second-stage drum, 16-hydraulic oil tank, 17-bottom net flushing pipeline, 18-surface net flushing pipeline, 19-feeding pipe flushing pipeline, 20-brine flushing pipeline, 21-feeding control valve, 22-feeding flow regulating valve, 23-white water inlet branch, 24 -White water regulating valve, 25-Brine regulating valve, 26-Flow meter, 27-Bottom net flushing control valve, 28-Surface net flushing control valve, 29-Down pipe flushing control valve, 30-Distribution plate, 31-Camera, 32-Transparent sight glass, 33-Fill light, 34-Sight glass flushing pipeline, 35-Sight glass flushing control valve, 36-Pressure monitor, 37-Current monitor, 38-Oil temperature monitor, 39-Oil level monitor, 40-Second current monitor, 41-Vibration monitor, 42-Second vibration monitor. DETAILED DESCRIPTION
[0015] The utility model is further described below in conjunction with the accompanying drawings.
[0016] like Figure 1As shown, the two salt slurry centrifuges in the drying process of the applicant were automated by using the centrifuge automation control device of the utility model. A single centrifuge 1 includes a drum outer wall 11, an internal primary drum 13, a secondary drum 14, and a door 12. A hydraulic oil tank 16, an oil pump 5, and a main motor 6 are configured for the centrifuge 1. A feed flow regulating valve 22 is provided on the feed pipe 2 of the centrifuge 1. The action of the feed pipe conversion cylinder 9 is changed. The feed pipe 8 of the centrifuge 1 can be connected to the conveyor belt of the next process, or switched to connect to the waste pool. The centrifuge 1 is also equipped with a multi-way cleaning device, which includes a brine flushing pipeline 20 connected to the clean brine, a white water flushing pipeline connected to the water source, and a brine flushing pipeline. The outlet of 20 is arranged on the feed pipe 2 in front of the feed flow regulating valve 22. The white water flushing pipeline includes a bottom net flushing pipeline 17 for flushing the bottom net of the centrifuge drum, a surface net flushing pipeline 18 for flushing the surface net of the centrifuge drum, and a down pipe flushing pipeline 19 for flushing the down pipe 8 of the centrifuge. The control valve of the brine flushing pipeline 20 is a brine regulating valve 25, the control valve of the bottom net flushing pipeline 17 is a bottom net flushing control valve 27, the control valve of the surface net flushing pipeline 18 is a surface net flushing control valve 28, and the control valve of the down pipe flushing pipeline 19 is a down pipe flushing control valve 29. The control valves of the above flushing pipelines are all pneumatic regulating valves and each pneumatic regulating valve is controlled by an automatic control system 4, and the automatic control system 4 adopts a DCS system. The above design is to configure corresponding flushing pipelines for positions prone to blockage and crystallization, and the flushing pipelines can be automatically controlled by the automatic control system, which is conducive to formulating an appropriate automatic flushing degree according to the operating conditions, avoiding serious blockage of the centrifuge, ensuring normal operation, and reducing failures.
[0017] The purpose of the brine flushing pipeline connected to the feed pipe is to lower the solid-liquid ratio of the salt slurry. The brine flushing pipeline is normally open to allow the salt slurry to flow smoothly without blocking the feed pipe.
[0018] like Figure 1 As shown, the brine flushing pipeline 20 is also connected in parallel with the white water inlet branch 23 of the white water regulating valve 24. If the blockage is serious, the white water regulating valve 24 on the white water inlet branch 23 can be opened to pass white water into the centrifuge to quickly dissolve some salt crystals and impurities, so as to quickly relieve the serious blockage. Whether the blockage is serious can be judged by the feed flow counter value. If the value is smaller than the normal value, the blockage is serious. Other white water flushing pipelines are usually opened only in the cleaning mode. Figure 1 As shown, after the feed pipe flushing pipeline 19 is split, two water outlets with different radial positions are arranged in the upper and lower parts of the feed pipe. The feed pipe flushing water volume is large, which can perform flushing better.
[0019] like Figure 1As shown, the centrifuge automation control device also includes a visual monitoring system, which includes a camera 31, a mirror flushing device, a transparent mirror 32, and a fill light 33. The camera 31 is installed outside the door 12 of the centrifuge, the lens of the camera 31 and the fill light 33 are aimed at the inside of the centrifuge, the transparent mirror 32 is embedded in the door 12, the camera 31 and the inside of the centrifuge are separated by the transparent mirror 32, the mirror flushing device acts on the transparent mirror 32, the mirror flushing device includes a mirror flushing pipeline 34 connected to a water source, and the mirror flushing control valve 35 of the mirror flushing pipeline 34 adopts a pneumatic regulating valve and controls the pneumatic regulating valve through the automatic control system 4. The mirror flushing pipeline 34 is used to maintain the transparency of the transparent mirror, and the fill light 33 and the camera 31 are used to complete the remote real-time observation, which is conducive to timely discovering the abnormal situation of the centrifuge, and timely taking corresponding disposal measures such as adjusting the flushing frequency, flushing duration, etc., to prevent the centrifuge from being blocked. The mirror flushing pipeline 34 is also opened only in the cleaning mode.
[0020] like Figure 1 As shown, since the centrifuge is a key equipment for vacuum evaporation salt production, in addition to the conventional one-in-one standby, a pressure monitor 36 and a current monitor 37 are specially set for the oil pump 5, and an oil temperature monitor 38 and an oil level monitor 39 are set for the hydraulic oil tank 16. When the oil level of the oil level monitor 39 drops to the H1 position, the system alarm, which can be a DCS system warning and the corresponding warning light flashing, when the oil level drops to H2, where H1 is higher than H2, the system protection is started: the centrifuge is directly shut down; a second current monitor 40 and a vibration monitor 41 are set for the main motor 6, and a second vibration monitor 42 is set on the outer wall 11 of the drum of the centrifuge 1. The above monitors are all connected to the automatic control system 4 by signal, so that the automatic control system can record the information of the monitors, and can detect abnormal conditions early through the feedback of abnormal information, make corresponding disposal as soon as possible, prevent blockage accidents, and eliminate the impact early.
[0021] Conventionally, each cleaning pipeline of a single centrifuge can be opened every hour for about 20 seconds for automatic cleaning. For example, the following automatic cleaning settings: when the automatic cleaning program starts, the feed control valve 21 of the centrifuge is closed, the brine regulating valve 25 is closed, and the centrifuge 1 runs in the dehydration mode (high-speed operation in this mode) for 15 seconds, and the feed pipe conversion cylinder 9 controls the outlet of the feed pipe 8 to be transferred to the waste pool, and the centrifuge automatically enters the cleaning mode (low-speed operation in this mode), and the feed pipe white water regulating valve 24, the bottom net flushing control valve 27, the surface net flushing control valve 28, and the feed pipe flushing switch valve 29 are opened. After the flushing lasts for 20 seconds, the bottom net flushing control valve 27, the surface net flushing control valve 28, and the feed pipe flushing switch valve 29 are closed; the centrifuge enters the dehydration mode again from the cleaning mode, the centrifuge feed control valve 21 and the brine regulating valve 25 are opened, and the feed pipe conversion cylinder 9 controls the outlet of the feed pipe 8 to be transferred to the wet salt transport belt. Before each action of the automatic cleaning program starts, the automatic control system 4 will confirm whether the previous action is completed, and then start the next action after confirmation.
[0022] By utilizing the DCS system, each control valve used for cleaning can also be manually opened through the control room when the automatic cleaning program is not started, so as to perform manual customized cleaning.
[0023] After the transformation is completed by using the utility model, the centrifuge for salt production can be automatically operated, and the easily blocked positions of the centrifuge can be cleaned in advance and periodically to prevent production accidents caused by blockage. Through the visual monitoring system and various monitors, the control room personnel can grasp the operating status of the centrifuge in real time, eliminating the need to set up special personnel to look after the centrifuge, saving labor costs. The original two centrifuges alternately enter the automatic cleaning program, which almost eliminates the shutdown for fault handling in the drying process, making the centrifuge output more stable, which is conducive to the precise control of the iodine content in refined salt and ensures product quality and safety.
Claims
1. A centrifuge automation control device, comprising a centrifuge (1) and a drum outer wall (11) thereof, a hydraulic oil tank (16), an oil pump (5), and a main motor (6) configured for the centrifuge (1), and a feed flow regulating valve (22) provided on a feed pipe (2) of the centrifuge (1), wherein: The centrifuge (1) is equipped with a multi-channel cleaning device, which includes a brine flushing pipeline (20) connected to the clean brine and a white water flushing pipeline connected to the water source. The outlet of the brine flushing pipeline (20) is arranged on the feed pipe (2) in front of the feed flow regulating valve (22). The white water flushing pipeline includes a bottom screen flushing pipeline (17) for flushing the bottom screen of the centrifuge drum, a surface screen flushing pipeline (18) for flushing the surface screen of the centrifuge drum, and a down pipe flushing pipeline (19) for flushing the down pipe (8) of the centrifuge. The control valves of the above flushing pipelines adopt pneumatic regulating valves and the pneumatic regulating valves are controlled by the automatic control system (4).
2. The centrifuge automation control device according to claim 1, characterized in that: The device also comprises a visual monitoring system, the visual monitoring system comprising a camera (31), a mirror flushing device, a transparent mirror (32), and a fill light (33), the camera (31) being mounted outside the door (12) of the centrifuge, the lens of the camera (31) and the fill light (33) being aimed at the interior of the centrifuge, the transparent mirror (32) being embedded in the door (12), the camera (31) and the interior of the centrifuge being separated by the transparent mirror (32), the mirror flushing device acting on the transparent mirror (32), the mirror flushing device comprising a mirror flushing pipeline (34) connected to a water source, the control valve of the mirror flushing pipeline (34) being a pneumatic regulating valve and the pneumatic regulating valve being controlled by an automatic control system (4).
3. The centrifuge automation control device according to claim 1, characterized in that: The oil pump (5) is provided with a pressure monitor (36) and a current monitor (37), the hydraulic oil tank (16) is provided with an oil temperature monitor (38) and an oil level monitor (39), the main motor (6) is provided with a second current monitor (40) and a vibration monitor (41), and a second vibration monitor (42) is provided on the outer wall (11) of the drum of the centrifuge (1), and the above monitors are connected to the automatic control system (4) by signal.
4. The centrifuge automation control device according to claim 1, characterized in that: A white water inlet branch (23) provided with a white water regulating valve (24) is connected in parallel to the brine flushing pipeline (20).
5. The centrifuge automation control device according to claim 1, characterized in that: After the flow of the discharge pipe flushing pipeline (19) is split, two water outlets are arranged in the upper and lower parts of the discharge pipe, which are staggered in radial direction of the discharge pipe.