Protection device for interlocking closing of upper gate during fault shutdown of coal injection feeder
By designing a pulverized coal feeder malfunction shutdown interlock upper gate protection device, the upper gate is automatically closed using circuit components, solving the problem of raw coal entering when the pulverized coal feeder malfunctions, thus improving production safety and efficiency.
Patent Information
- Application Number
- CN202423284364.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-27
AI Technical Summary
When the pulverized coal feeder shuts down due to frequency converter failure or when the coal outlet is blocked, the upper gate cannot close in time, causing raw coal to enter the feeder, increasing cleaning time and safety risks.
A protective device for interlocking the closure of the upper gate of a coal injection feeder in case of a fault shutdown was designed. The device utilizes circuit components such as circuit breakers, relays, and intermediate relays to automatically close the upper gate in case of a fault and alert the operator through an audible and visual alarm.
When the coal feeder malfunctions, the upper gate automatically closes to reduce coal accumulation, shorten downtime, and improve production safety and efficiency.
Smart Images
Figure CN223534278U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of coal injection feeder equipment, specifically relating to a protective device for the closure of the upper gate of a coal injection feeder in case of malfunction and shutdown. Background Technology
[0002] The pulverized coal feeder is a crucial piece of equipment in the pulverized coal injection system of a blast furnace, accurately adjusting the coal feed rate of the hammer crusher according to load requirements. The feeder is a fully enclosed wide-belt conveyor, driven by a variable frequency motor to adjust its speed. The upper gate of the feeder is an important component, opening or closing the feed inlet to control the entry of raw coal from the raw coal bunker and regulate the flow rate of pulverized coal into the feeder, thus achieving initial control of the coal feed rate. The upper gate control system is a hydraulic gate control system responsible for driving the opening and closing of the gate. After the oil pump starts, when the gate needs to be opened or closed, the hydraulic motor of the upper gate is activated based on the automatic control opening and closing signals, thereby driving the upper gate to open and close.
[0003] In the original pulverized coal injection system, there was no interlocking device between the feeder frequency converter malfunction, coal outlet blockage, and the upper gate. When the feeder experienced a frequency converter malfunction and shutdown, or a coal outlet blockage, the upper gate did not receive a closing command, and raw coal continued to enter the feeder from the raw coal bunker. If not detected in time, this resulted in raw coal entering the feeder conveyor belt, forming a large amount of accumulated coal. Cleaning this accumulated coal required a significant amount of time, increasing downtime and impacting normal blast furnace production, thus increasing production costs. Furthermore, cleaning the accumulated coal required personnel to enter the feeder, working in a confined space, which greatly increased the risk of safety issues for production workers. Utility Model Content
[0004] The purpose of this utility model is to provide a protection device for the interlocking and closing of the upper gate of a coal injection feeder in case of a malfunction shutdown. It has the function of closing the upper gate in case of a malfunction shutdown of the coal injection feeder, and solves the problem in the prior art that when the feeder stops due to frequency converter failure or coal blockage at the coal outlet, the upper gate does not receive a closing command, and raw coal continues to enter the feeder from the raw coal bunker.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a protection device for the closure of the gate of the interlocking system for the failure shutdown of a coal injection feeder, including a circuit breaker QF. The circuit breaker QF is connected to the power supply line L. The normally open contact of the intermediate relay 14CZJ is connected to the power supply line L. The normally open contact of the intermediate relay 14CZJ is connected in parallel with the normally open contact of the intermediate relay 11CZJ. The coil of the series relay KA1 and the audible and visual alarm SG are connected in parallel to the power supply line N.
[0006] A start switch SA1 is connected to the power supply line L. The start switch SA1 is connected in parallel with the normally open contact of the intermediate relay KA1, and in series with the normally closed contact of relay 2ZJ and the coil of relay 1ZJ to the power supply line N.
[0007] A stop switch SA2 is connected to the power supply line L. The stop switch SA2 is connected in parallel with the normally open contact of intermediate relay KA1 and the normally open contact of intermediate relay 7CZJ. The coil of relay 2ZJ is connected in series to the power supply line N. The normally open contact of relay 1ZJ, the normally closed contact of intermediate relay 7CZJ, the coil of contactor C42, and the thermal relay RJ4 are connected in series to the power supply line N.
[0008] A shut-off switch SA3 is connected to the power supply line L. The normally open contact of the intermediate relay KA1 is connected in parallel with the shut-off switch SA3. The normally closed switch of relay 3ZJ and the coil of relay 4ZJ are connected in series and then connected to the power supply line N.
[0009] The coils of limit switch SQ and intermediate relay 7CZJ are connected in series on the power supply line L and then connected to the power supply line N.
[0010] Preferably, the normally open contact of the intermediate relay 14CZJ, the start switch SA1, the stop switch SA2, the normally open contact of the relay 1ZJ, the stop switch SA3, and the limit switch SQ are connected on the power supply L line at the rear side of the circuit breaker QF.
[0011] Preferably, the circuit breaker QF is of type DZ47S C6.
[0012] Preferably, the normally open contact of relay KA1 is a passive normally open contact, the normally open contact of intermediate relay 11CZJ is a passive normally open contact, the normally open contact of intermediate relay 14CZJ is a passive normally open contact, and the normally open contact of intermediate relay 7CZJ is a passive normally open contact.
[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:
[0014] 1. In the event of a fault shutdown of the coal feeder frequency converter or a coal outlet blockage, the interlocking mechanism of this utility model will trigger the upper gate to close, which can alert the staff and prompt them to take appropriate measures.
[0015] 2. This utility model has an interlock function for closing the upper gate when the coal feeder fails to shut down, which solves the problem in the prior art where the upper gate does not receive a closing command when the coal feeder stops due to frequency converter failure or coal blockage at the coal outlet. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a circuit diagram of a protective device for interlocking and closing the gate of a coal injection feeder in case of a malfunction and shutdown. Detailed Implementation
[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.
[0020] Example 1, as Figure 1 As shown, a protective device for the interlocking and gate closure of a pulverized coal feeder during a fault shutdown includes a circuit breaker QF. The circuit breaker QF is a circuit protection device that automatically cuts off the power supply when an overload or short circuit occurs in the circuit, protecting electrical equipment and personnel safety, and effectively preventing equipment damage caused by excessive current. The circuit breaker QF is connected to the power supply line L; disconnecting the circuit breaker QF will de-energize the device, allowing for maintenance.
[0021] The normally open contact of intermediate relay 14CZJ is connected to the L power line. The normally open contact of intermediate relay 14CZJ is connected in parallel with the normally open contact of intermediate relay 11CZJ. The coil of relay KA1 and the audible and visual alarm SG are connected in parallel to the N power line. The audible and visual alarm SG is an alarm device, mainly used to alert production personnel of equipment malfunctions and shutdowns. When the upper gate is fully closed, the circuit breaker QF can be manually disconnected, and the audible and visual alarm will stop working, reducing noise pollution in the production control room. After the coal feeder malfunction is resolved, the circuit breaker QF is manually engaged.
[0022] A start switch SA1 is connected to the power supply line L. The start switch SA1 is connected in parallel with the normally open contact of the intermediate relay KA1, and in series with the normally closed contact of relay 2ZJ and the coil of relay 1ZJ to the power supply line N.
[0023] A stop switch SA2 is connected to the power supply line L. The stop switch SA2 is connected in parallel with the normally open contact of intermediate relay KA1 and the normally open contact of intermediate relay 7CZJ. The coil of relay 2ZJ is connected in series to the power supply line N. The normally open contact of relay 1ZJ, the normally closed contact of intermediate relay 7CZJ, the coil of contactor C42, and the thermal relay RJ4 are connected in series to the power supply line N.
[0024] A shut-off switch SA3 is connected to the power supply line L. The normally open contact of the intermediate relay KA1 is connected in parallel with the shut-off switch SA3. The normally closed switch of relay 3ZJ and the coil of relay 4ZJ are connected in series and then connected to the power supply line N.
[0025] The coils of limit switch SQ and intermediate relay 7CZJ are connected in series on the power supply line L and then connected to the power supply line N.
[0026] Specific relay types: Main shutdown fault relay KA1, coal outlet blockage fault relay 11CZJ, coal feeder frequency converter fault intermediate relay 14CZJ, coal outlet blockage intermediate relay 11CZJ, oil pump start intermediate relay 1ZJ, oil pump stop intermediate relay 2ZJ, upper gate close intermediate relay 4ZJ, upper gate fully closed intermediate relay 7CZJ, upper gate close contactor C42.
[0027] Protection Principle: When the coal feeder experiences a frequency converter failure and shutdown, or a coal outlet blockage, the audible and visual alarm SG activates, alerting production personnel to the equipment malfunction. At this time, the coil of relay KA1 is energized, the normally open contact of relay KA1 closes, intermediate relay 1ZJ is energized, and the oil pump is remotely started. After relay KA1 is energized, its normally open contact closes and engages with the normally closed contact of intermediate relay 7CZJ to send a signal to close the upper gate. This energizes the coil of intermediate relay 4ZJ, causing its normally open contact to close. This, in turn, engages with the normally open contact of intermediate relay 1ZJ and the normally closed contact of intermediate relay 7CZJ, energizing contactor C42, and the upper gate motor controls the upper gate to close.
[0028] When the upper gate is fully closed, the limit switch SQ5 for the upper gate closed position closes, energizing intermediate relay 7CZJ. The normally closed contact of intermediate relay 7CZJ changes to a normally open contact, contactor C42 is de-energized, and the upper gate motor stops running. When the upper gate is fully closed again, the limit switch SQ5 closes, energizing intermediate relay 7CZJ and intermediate relay 2ZJ, issuing a stop command for the oil pump. The normally closed contact of intermediate relay 2ZJ changes to a normally open contact, intermediate relay 1ZJ is de-energized, and the oil pump stops working.
[0029] The specific design of the aforementioned key components will be discussed in detail below:
[0030] The normally open contact of the intermediate relay 14CZJ, the start switch SA1, the stop switch SA2, the normally open contact of the relay 1ZJ, the stop switch SA3, and the limit switch SQ are connected on the power supply line at the rear side of the circuit breaker QF.
[0031] The circuit breaker QF selected is the DZ47S C6 type. The selection of circuit breaker QF ensures good current rating and overload and short-circuit protection. The C-type circuit breaker can effectively protect against infrequent high instantaneous current loads, such as during motor startup.
[0032] The normally open contacts of relays KA1, 11CZJ, 14CZJ, and 7CZJ are all passive normally open contacts. A passive normally open contact means that the contact is open in the absence of an electrical signal.
[0033] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.
Claims
1. A protective device for interlocking and closing the upper gate of a pulverized coal feeder in case of malfunction and shutdown, characterized in that, Includes circuit breaker QF, which is connected to power supply line L. The normally open contact of intermediate relay 14CZJ is connected to the power supply line L. The normally open contact of intermediate relay 14CZJ is connected in parallel with the normally open contact of intermediate relay 11CZJ. The coil of series relay KA1 and the audible and visual alarm SG are connected in parallel to the power supply line N. A start switch SA1 is connected to the power supply line L. The start switch SA1 is connected in parallel with the normally open contact of the intermediate relay KA1, and in series with the normally closed contact of relay 2ZJ and the coil of relay 1ZJ to the power supply line N. A stop switch SA2 is connected to the power supply line L. The stop switch SA2 is connected in parallel with the normally open contact of intermediate relay KA1 and the normally open contact of intermediate relay 7CZJ. The coil of relay 2ZJ is connected in series to the power supply line N. The normally open contact of relay 1ZJ, the normally closed contact of intermediate relay 7CZJ, the coil of contactor C42, and the thermal relay RJ4 are connected in series to the power supply line N. A shut-off switch SA3 is connected to the power supply line L. The normally open contact of the intermediate relay KA1 is connected in parallel with the shut-off switch SA3. The normally closed switch of relay 3ZJ and the coil of relay 4ZJ are connected in series and then connected to the power supply line N. The coils of limit switch SQ and intermediate relay 7CZJ are connected in series on the power supply line L and then connected to the power supply line N.
2. The protective device for interlocking and closing the upper gate of a pulverized coal feeder in case of a malfunction shutdown as described in claim 1, characterized in that, The normally open contact of the intermediate relay 14CZJ, the start switch SA1, the stop switch SA2, the normally open contact of the relay 1ZJ, the stop switch SA3, and the limit switch SQ are connected on the power supply line at the rear side of the circuit breaker QF.
3. The protective device for interlocking and closing the upper gate of a pulverized coal feeder in case of a malfunction shutdown as described in claim 1, characterized in that, The circuit breaker QF is selected as type DZ47S C6.
4. The protective device for interlocking and closing the upper gate of a pulverized coal feeder in case of a malfunction shutdown as described in claim 1, characterized in that, The normally open contact of relay KA1 is a passive normally open contact, the normally open contact of intermediate relay 11CZJ is a passive normally open contact, the normally open contact of intermediate relay 14CZJ is a passive normally open contact, and the normally open contact of intermediate relay 7CZJ is a passive normally open contact.
5. The protective device for interlocking and closing the upper gate of a pulverized coal feeder in case of a malfunction shutdown as described in claim 1, characterized in that, The audible and visual alarm SG is installed above the control cabinet.