Sludge overflow alarm device of screw conveyor

Abstract

The utility model discloses a sludge overflow alarm device for a screw conveyer, which is used for detecting whether sludge at the joint of a discharge port of a centrifugal machine and a feed port of the screw conveyer overflows or not, and comprises a sensor, a DCS (Distributed Control System), an alarm module and a camera, the sensor is located on the outer side of the discharge port of the centrifugal machine, the input end of the DCS control system is connected with the output end of the sensor, the input end of the alarm module is connected with the output end of the DCS control system, and the camera is used for monitoring the real-time state of the discharge port of the spiral conveyor. The sensor, the DCS control system and the camera are additionally arranged, so that an operator is reminded when an abnormal condition is found, the field condition is timely mastered, a fault is timely handled, sludge overflow is timely cleaned, and meanwhile, the downtime and the production loss are reduced.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a sludge overflow alarm device for a screw conveyor. Background Technology

[0002] In the field of water treatment, centrifuge desludge systems play a crucial role as highly efficient solid-liquid separation equipment. The working principle of a centrifuge desludge system is primarily based on centrifugal force. When material (a mixture containing solid particles and liquid) enters the centrifuge, the high-speed rotating drum generates a powerful centrifugal force. Under the action of centrifugal force, solid particles settle on the inner wall of the drum, while the liquid flows out through the drum's screen or filter cloth, thus achieving solid-liquid separation. The centrifuge discharges the treated sludge into the hopper of a screw conveyor, which then transfers the sludge to a sludge silo. Finally, a transport vehicle transports the sludge out of the plant. The centrifuge's discharge port is connected to the screw conveyor's inlet; typically, the screw conveyor's inlet is larger than the centrifuge's discharge port, which facilitates subsequent maintenance and cleaning.

[0003] However, in actual production, various problems are often encountered, such as screw conveyor failure, abnormal sludge disposal leading to excessively thin sludge, etc., which prevent the screw conveyor from transferring the sludge out of the hopper in time, causing the hopper to become blocked, which in turn causes the centrifuge to become blocked. There are no timely detection and reporting measures in this process, which causes the entire treatment process to malfunction and affects the water treatment efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a sludge overflow alarm device for screw conveyors to solve the problems mentioned in the background art.

[0005] To address the aforementioned technical problems, this utility model provides a sludge overflow alarm device for a screw conveyor, used to detect whether sludge overflows at the connection between the centrifuge outlet and the screw conveyor inlet. The inner diameter of the screw conveyor inlet is larger than the outer diameter of the centrifuge outlet. The device includes a sensor, a DCS control system, an alarm module, and a camera. The sensor is installed at the top of the screw conveyor inlet and located outside the centrifuge outlet. The input terminal of the DCS control system is connected to the output terminal of the sensor, and the input terminal of the alarm module is connected to the output terminal of the DCS control system. The camera is located above the sensor and is used to monitor the real-time status of the screw conveyor outlet.

[0006] Furthermore, the screw conveyor is inclined, with the screw conveyor outlet located above the bolt conveyor inlet, and the sensor is installed at the end of the screw conveyor inlet away from the screw conveyor outlet.

[0007] Furthermore, the camera is mounted on the casing of the centrifuge.

[0008] Furthermore, the sensor is a rotary paddle level switch.

[0009] Furthermore, the DCS control system establishes a communication connection with the engineer's workstation via a switch and a photoelectric converter.

[0010] Furthermore, the DCS control system includes a DI module and a DO module. The DI module receives the feedback signal from the rotary paddle level switch, and the DO module is connected to the alarm module.

[0011] Furthermore, the alarm module employs an audible and visual alarm.

[0012] The beneficial effects of this invention are as follows: By adding sensors, a DCS control system, and cameras, this invention alerts operators when abnormal situations are detected, allowing for timely monitoring of the situation, prompt handling of faults, and cleanup of sludge overflow. This avoids potential equipment damage and environmental pollution caused by sludge overflow from the screw conveyor, while also reducing downtime and production losses. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0014] Figure 2 This is an electrical wiring diagram of an embodiment of the present utility model.

[0015] The components include: 1. Screw conveyor; 2. Centrifuge; 3. Screw conveyor inlet; 4. Centrifuge outlet; 5. Sensor; 6. Camera. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] To make the objectives, technical solutions and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0018] In the following description, references to "an embodiment," "an embodiment," "an example," "example," etc., indicate that the described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitation, but not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Furthermore, the repeated use of the phrase "an embodiment according to this application," while possibly referring to the same embodiment, does not necessarily refer to the same embodiment.

[0019] like Figure 1-2 As shown, this utility model discloses a sludge overflow alarm device for a screw conveyor 1, used to detect whether sludge overflows at the connection between the centrifuge outlet 4 and the screw conveyor inlet 3. The screw conveyor inlet 3 is larger than the centrifuge outlet 4, meaning the screw conveyor inlet 3 is connected to the centrifuge outlet 4. The first side of the screw conveyor inlet 3 is flush with the first side of the centrifuge outlet 4, and the second side of the screw conveyor inlet 3 is located at the outer end of the second side of the centrifuge outlet 4, forming an observation port. It includes a sensor 5, a DCS control system, an alarm module, and a camera 6. The sensor 5 is installed on top of the screw conveyor inlet 3, and is located outside the centrifuge outlet 4, i.e., the sensor 5 is installed at the observation port to ensure accurate detection of sludge overflow. The input end of the DCS control system is connected to the output end of the sensor 5, and the input end of the alarm module is connected to the output end of the DCS control system. The camera 6 is located above the sensor 5 and is used to monitor the real-time status of the screw conveyor 1 outlet. The DCS control system can also be directly translated as a "distributed control system" or "distributed computer control system". It adopts the basic design concept of decentralized control and centralized operation and management, and uses a multi-level, hierarchical, cooperative and autonomous structure. Its main feature is its centralized management and decentralized control.

[0020] In this embodiment, when the screw conveyor inlet 3 is connected to the centrifuge outlet 4, a portion of the left side of the screw conveyor inlet 3 is fully exposed, forming an open state, and the sensor 5 is installed on this side. When sludge becomes clogged or overflows, the sludge comes into contact with the sensor 5, which transmits its signal to the DCS control system. The DCS control system receives and processes this signal and triggers the alarm module to alert the operators. The alarm module may include audible alarms, visual alarms, or sending electronic alarms to the operators. Additionally, the camera 6 provides real-time monitoring for the control room staff. Upon detecting any abnormalities, the staff can immediately review the monitoring footage and promptly grasp the situation on-site. Simultaneously, it records real-time footage of the sludge overflow for subsequent analysis and processing.

[0021] This invention, by adding sensor 5, a DCS control system, and a camera, alerts operators when abnormal situations are detected, enabling timely monitoring of the site and prompt handling of faults and cleanup of sludge overflow. This avoids potential equipment damage and environmental pollution caused by sludge overflow from the screw conveyor 1, while also reducing downtime and production losses.

[0022] In one embodiment, the screw conveyor 1 is inclined, with its outlet located above the feed inlet of the screw conveyor. The sensor 5 is installed at the end of the screw conveyor feed inlet 3 furthest from the screw conveyor outlet, i.e., the lower end of the screw conveyor 1. This means that after the sludge falls normally from the centrifuge outlet 4, it can smoothly pass through the inclined screw conveyor 1 without contacting the sensor 5. Furthermore, if the sludge becomes clogged or overflows, the sensor 5 will be triggered earlier.

[0023] In one embodiment, camera 6 is mounted on the housing of centrifuge 2.

[0024] In one embodiment, sensor 5 is a rotary paddle level switch. The rotary paddle is connected to a clutch via a drive shaft. When not in contact with material, the motor continues to operate normally. When the paddle comes into contact with material and creates resistance, the motor stops rotating and outputs a dry contact signal. Combined with a DCS control system, this output signal can be connected to the DCS control system input module. When the DCS control system input module channel is activated, the DCS control system issues a corresponding alarm to alert the operators. In this embodiment, the rotary paddle level switch is powered by 220V, which can be supplied locally. The rotary paddle level switch is locally powered, and the output signal is a passive relay output. When power is input, the paddle rotates with the drive shaft. When the paddle encounters resistance, the internal relay of the level switch engages, the output terminal is connected, and the signal is transmitted to the DCS control system input module.

[0025] In one embodiment, the DCS control system establishes a communication connection with the engineer's workstation via a switch and a photoelectric converter.

[0026] In one embodiment, the DCS control system includes a DI module and a DO module. The DI module receives feedback signals from the rotary paddle level switch, and the DO module is connected to an alarm module.

[0027] The feedback signal of the rotary paddle level switch is connected to the DCS control DI module. During normal operation, the feedback signal is in an open state, the channel connected to the DI module is not closed, and the controller has no signal input. When the operation is obstructed, the feedback signal changes from an open state to a closed state, and the controller receives the signal.

[0028] For this signal, two signal processing methods are proposed: Method 1: The signal is directly processed by the DCS configuration and displayed on the alarm screen for easy viewing and handling by operators. Method 2: The signal is used as an input signal to the controller, and a channel is selected as an output port on the DCS controller's DO module. An external alarm module is connected to this output port. When this input signal is connected to the DCS card, the output module closes, triggering an alarm from the external alarm module to notify the control room personnel for immediate action.

[0029] In one embodiment, the alarm module employs an audible and visual alarm.

[0030] The design concept of this utility model embodiment is as follows:

[0031] The screw conveyor 1 is inclined. When the screw conveyor inlet 3 connects with the centrifuge outlet 4, a portion of the left side of the screw conveyor inlet 3 is fully exposed, forming an open state. Sensor 5 is installed on this side, located at the lower end of the screw conveyor 1. Sensor 5 is a rotary paddle level switch. After the rotary paddle level switch was installed, on-site testing revealed that when the blades encountered resistance, alarm information from the central control room's alarm module (i.e., the audible and visual alarm) and the DCS control system would be displayed. Simultaneously, to confirm whether there were any false alarms, a camera 6 was installed near the centrifuge 2 for the convenience of the central control room personnel.

[0032] After the sludge falls normally from the centrifuge outlet 4, it can be smoothly transferred through the inclined screw conveyor 1 without coming into contact with the sensor 5. The feedback signal of the rotary paddle level switch is connected to the DI module of the DCS control system. During normal operation, the feedback signal is in an open state, the channel connected to the DI module is not closed, and the controller has no signal input.

[0033] When sludge becomes clogged or overflows, the rotary paddle level switch blades are obstructed, and its feedback signal changes from an open state to a closed state, which is then received by the controller. Two signal processing methods are available for this signal: Method 1: The signal is directly processed by the DCS configuration and displayed on the alarm screen for easy viewing and handling by operators. Method 2: The signal is used as an input signal to the controller, and a channel is selected as an output port on the DCS controller's output (DO) module. An external alarm module is connected to this output port. When this input signal is connected to the DCS card, the output module closes, triggering an external audible and visual alarm, prompting immediate action from the control room personnel.

[0034] This invention, by adding sensor 5, a DCS control system, and a camera, alerts operators when abnormalities are detected, enabling timely monitoring of the situation and prompt handling of faults and cleanup of sludge overflow. This avoids potential equipment damage and environmental pollution caused by sludge overflow from the screw conveyor 1, while also reducing downtime and production losses.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sludge overflow alarm device for a screw conveyor, used to detect whether sludge overflows at the connection between the centrifuge outlet and the screw conveyor inlet, wherein the inner diameter of the screw conveyor inlet is larger than the outer diameter of the centrifuge outlet, characterized in that: The system includes sensors, a DCS control system, an alarm module, and a camera. The sensors are installed at the top of the screw conveyor inlet and outside the centrifuge outlet. The input of the DCS control system is connected to the output of the sensors, and the input of the alarm module is connected to the output of the DCS control system. The camera is located above the sensors and is used to monitor the real-time status of the screw conveyor outlet.

2. The sludge overflow alarm device for a screw conveyor according to claim 1, characterized in that: The screw conveyor is inclined, with the screw conveyor outlet located above the screw conveyor inlet, and the sensor is installed at the end of the screw conveyor inlet away from the screw conveyor outlet.

3. The sludge overflow alarm device for a screw conveyor according to claim 1, characterized in that: The camera is mounted on the casing of the centrifuge.

4. The sludge overflow alarm device for a screw conveyor according to claim 1, characterized in that: The sensor is a rotary paddle level switch.

5. The sludge overflow alarm device for a screw conveyor according to claim 1, characterized in that: The DCS control system establishes a communication connection with the engineer's workstation via a switch and a photoelectric converter.

6. The sludge overflow alarm device for a screw conveyor according to claim 4, characterized in that: The DCS control system includes a DI module and a DO module. The DI module receives the feedback signal from the rotary paddle level switch, and the DO module is connected to the alarm module.

7. The sludge overflow alarm device for a screw conveyor according to claim 1, characterized in that: The alarm module uses an audible and visual alarm.

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