Boiler scraper current detection protection device

Abstract

The utility model provides a boiler scraper current detection protection device which comprises a frequency converter, the frequency converter is respectively connected with a boiler scraper motor, an instrument and a time relay B, and the instrument is respectively connected with a time relay A and an alarm device. According to the utility model, the operation of the scraper conveyor is controlled by detecting the operation current of the scraper conveyor, when the detection current is high, the frequency converter automatically protects the shutdown and prevents the chain from being snapped, and when the detection current is low, the delay time is set, and after the delay time is reached, the shutdown signal is output to the frequency converter to stop the operation of the scraper conveyor; in order to prevent the phenomenon of incapability of starting due to low current during starting, a frequency converter operation signal is adopted to control a time relay, and the time relay outputs a signal in a delayed manner to participate in control, so that the problem is solved; according to the utility model, the abnormal operation condition of the scraper conveyor can be rapidly detected and timely controlled, all elements can be far away from the scraper conveyor body, and the detection elements are prevented from being damaged due to high temperature.

Description

Technical Field

[0001] The utility model belongs to the technical field of smelting equipment, and in particular relates to a boiler scraper current detection and protection device. Background Art

[0002] The waste heat boiler is one of the indispensable equipment in copper smelting. It can not only recover the waste heat energy in the high-temperature flue gas and reduce the flue gas temperature, but also capture the smoke containing precious metals in the high-temperature flue gas, reduce the dust content of the flue gas, and ensure the smooth flow of the process system. The smoke collected by the boiler is collected and transported by the scraper. Due to the large changes in the flue gas volume during the production process of the copper smelting furnace, the high content of SO2 and smoke in the flue gas, and coking, the operating environment of the boiler scraper is quite harsh, which often leads to the boiler scraper chain breaking or derailment. If it is not discovered in time, the scraper motor will continue to run, which will cause the scraper chain to accumulate in the lower ash pipe and cannot be taken out in a short time. It is necessary to stop the scraper chain to recover. If the scraper chain can be recovered in time at the early stage of chain breaking, If it is discovered in time, it can be repaired without stopping the machine. Therefore, a device that can detect and automatically stop the scraper chain in the early stage of chain breakage is needed to ensure that the scraper chain will not accumulate in the lower ash pipe and improve the driving rate. The current publication number CN204184876U discloses a scraper chain break protection device, but its patent uses a detection slide that rotates with the driven sprocket on the driven sprocket to detect the scraper chain breakage, which has serious hysteresis. After the scraper chain breaks, if it breaks in the middle and lower part, the chain drives the driven wheel to continue to rotate due to the continued operation of the driving wheel. The driven wheel can stop rotating until the chain breakage completely passes the driven wheel. This solution cannot detect the scraper chain breakage in time and has serious hysteresis. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a boiler scraper current detection protection device, which can ensure timely detection of scraper chain breakage and output an alarm signal to promptly notify the operator without the need for a control system, with low cost and easy implementation.

[0004] The technical solution of the utility model is implemented as follows: a boiler scraper current detection protection device, including a frequency converter, the frequency converter is respectively connected to the boiler scraper motor, the instrument, and the time relay B, the instrument is respectively connected to the time relay A and the alarm device;

[0005] Preferably, the instrument is provided with two pairs of normally open passive output contacts, and low current passive signal output and alarm signal output can be set. The low current passive signal output controls time relay A, and the delay time is set to 10s. The inverter operation signal controls time relay B, and the delay time is set to 2s. The normally open point of time relay A controlled by the low current passive output signal is connected in series with the normally open point of time relay B controlled by the inverter operation signal and then connected to terminals 6 and 10 on the inverter. The inverter stops and outputs an alarm signal to control the alarm device.

[0006] The beneficial effects of the utility model are as follows: the utility model controls the operation of the scraper machine by detecting the operating current of the scraper machine. When the detected current is high, the frequency converter automatically protects the machine and shuts it down to prevent the chain from breaking. When the detected current is low, a delay time is set. After the delay time is reached, a shutdown signal is output to the frequency converter to stop the operation of the scraper machine. In order to prevent the phenomenon that the current is low and the machine cannot be started at the beginning, the frequency converter operating signal is used to control the time relay, and the time relay delays the output signal to participate in the control, thereby solving the above problem. The utility model can quickly detect abnormal operating conditions of the scraper machine and control it in time, and all components can be kept away from the scraper machine body to prevent damage to the detection components due to high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the utility model;

[0008] Figure 2 This is a circuit diagram of the utility model.

[0009] Parts Description: 1. Boiler scraper motor, 2. Frequency converter, 3. Instrument, 4. Time relay A, 7. Alarm device, 8. Time relay B. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0011] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0012] See attached Figure 1A boiler scraper current detection and protection device includes a frequency converter 2, which is respectively connected to a boiler scraper motor 1, an AI-501 instrument 3, and a time relay B8, and the AI-501 instrument 3 is respectively connected to a time relay A4 and an alarm device 7.

[0013] Specifically, the inverter 2 detects the running current of the scraper and outputs it to the AI-501 instrument 3 for control. The 501 instrument 3 can provide two pairs of normally open points, which can set low-current passive signal output and alarm signal output. The low-current passive signal output controls a time relay A4, and sets the delay time to 10S. The inverter running signal controls another time relay B8, and sets the delay time to 2S. The normally open point of the time relay A4 controlled by the low-current passive output signal is connected in series with the normally open point of the time relay B8 controlled by the inverter running signal and connected to the 6 and 10 terminals on the inverter 2, that is, the DIN3 external fault input closed input point, to stop the inverter and output an alarm signal to control the alarm. The effect achieved is that after the inverter runs for 2S, if the current is lower than the set value of 10S, the inverter stops working to prevent the inverter and the motor from continuing to run after the scraper chain breaks, and the broken chain is transmitted to the lower ash pipe to cause a stop.

[0014] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A boiler scraper current detection and protection device, characterized in that The invention comprises a frequency converter (2), wherein the frequency converter (2) is respectively connected to a boiler scraper motor (1), an instrument (3), and a time relay B (8); the instrument (3) is respectively connected to a time relay A (4) and an alarm device (7); the instrument (3) is provided with two pairs of normally open passive output contacts, and a low current passive signal output and an alarm signal output can be set; the low current passive signal output controls the time relay A (4), and the delay time is set to 10 seconds; the frequency converter (2) operation signal controls the time relay B (8), and the delay time is set to 2 seconds; the normally open point of the time relay A (4) controlled by the low current passive output signal and the normally open point of the time relay B (8) controlled by the frequency converter operation signal are connected in series and then connected to terminals 6 and 10 on the frequency converter (2); the frequency converter stops, and an alarm signal is output to control the alarm device (7).

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