Chain breakage protection control system of slag remover

Abstract

The utility model discloses a chain breakage protection control system of a slag remover. If the breakage protection configuration of the chain of the slag remover is improper, the chain of the slag remover cannot be well protected in a severe operating environment, and breakage accidents frequently occur. The device comprises an action input loop, a judgment protection loop and an action output loop, the action input loop comprises four travel switches which are connected in parallel, and each travel switch is connected with a corresponding input relay coil in series; the judgment protection loop comprises four input relay time-delay circuits which are connected in parallel, and each input relay time-delay circuit comprises an output relay coil which is connected in series in the main loop, and a normally open contact and a normally closed contact of an input relay which are connected in parallel. The normally open contact and the normally closed contact of the input relay are respectively connected in series with the corresponding time-delay relay coil. The chain breakage protection device is used for chain breakage protection of the slag remover.

Description

Technical Field

[0001] This utility model relates to a chain breakage protection control system for a slag remover. Technical Background

[0002] As a crucial component of a boiler system, the reliability of the slag remover directly impacts the safe and stable operation of the entire system. The chain, a core component of the slag remover, is the most prone to problems during operation, with chain breakage being the most common issue. Chain breakage not only involves significant repair and restoration work, resulting in high costs, but also presents significant safety risks to maintenance personnel during boiler operation. Furthermore, chain breakage poses a safety hazard to the boiler system and the entire unit. If the chain breakage protection system is improperly configured, the chain will not be adequately protected under harsh operating conditions, leading to frequent chain breakages. The importance of a chain breakage protection system is self-evident; however, improper settings can cause malfunctions and frequent tripping of the slag remover. Therefore, a chain breakage protection control system for slag removers is needed. Utility Model Content

[0003] The purpose of this utility model is to solve the above-mentioned technical problems and thus provide a chain breakage protection control system for a slag remover.

[0004] To address the aforementioned shortcomings, this utility model adopts the following technical solution:

[0005] A chain breakage protection control system for a slag remover includes an action input circuit, a judgment protection circuit, and an action output circuit.

[0006] The action input circuit includes four limit switches connected in parallel, each of which is connected in series with the corresponding input relay coil;

[0007] The judgment protection circuit includes four input relay delay circuits connected in parallel. Each input relay delay circuit includes an output relay coil connected in series in the main circuit and normally open and normally closed contacts of the input relays connected in parallel. The normally open and normally closed contacts of the input relays are connected in series with the corresponding delay relay coils.

[0008] The chain breakage protection control system for a slag remover includes an action output circuit comprising four normally open contacts of output relays. The four normally open contacts of the output relays are connected in series in pairs and then in parallel. The main circuit after the parallel connection is connected in series with the coil of the trip relay.

[0009] In the aforementioned chain breakage protection control system for a slag remover, two of the four limit switches are installed at both ends on one side of the slag remover, and the other two are installed at both ends on the other side of the slag remover. Beneficial effects

[0010] 1. Of the four limit switches in this utility model, two are installed at both ends on one side of the slag remover, and the other two are installed at both ends on the other side of the slag remover. The limit switches can be used to determine if the chain on the corresponding side is broken, which can protect the slag remover.

[0011] 2. By setting four limit switches and a judgment protection circuit, this utility model can improve the success rate of the chain breakage protection action of the slag remover, and improve the accuracy of the protection action while reducing the risk of false operation. Attached Figure Description

[0012] Figure 1 This is a diagram showing the arrangement of limit switches;

[0013] Figure 2 It is an action input loop diagram;

[0014] Figure 3 It is to determine the protection circuit diagram;

[0015] Figure 4 It is the action output circuit diagram;

[0016] In the diagram: 1. First limit switch; 2. Second limit switch; 3. Third limit switch; 4. Fourth limit switch; 5. First input relay coil; 6. Second input relay coil; 7. Third input relay coil; 8. Fourth input relay coil; 9. First time-delay relay coil; 10. Second time-delay relay coil; 11. Third time-delay relay coil; 12. Fourth time-delay relay coil; 13. Fifth time-delay relay coil; 14. Sixth time-delay relay coil; 15. Seventh time-delay relay coil; 16. Eighth time-delay relay coil; 17. First output relay coil; 18. Second output relay coil; 19. Third output relay coil; 20. Fourth output relay coil; 21. Trip relay coil. Detailed Implementation

[0017] A chain breakage protection control system for a slag remover includes an action input circuit, a judgment protection circuit, and an action output circuit.

[0018] Reference Figure 1 Of the four limit switches, two are installed at both ends on one side of the slag remover, and the other two are installed at both ends on the other side of the slag remover.

[0019] The first limit switch 1 and the second limit switch 2 are installed at both ends on one side of the slag remover, and the third limit switch 3 and the fourth limit switch 4 are installed at both ends on the other side of the slag remover.

[0020] The action input circuit includes four limit switches connected in parallel, each of which is connected in series with the corresponding input relay coil;

[0021] Reference Figure 2 The normally open contact of the first limit switch is connected in series with the first input relay coil 5, the normally open contact of the second limit switch is connected in series with the second input relay coil 6, the normally open contact of the third limit switch is connected in series with the third input relay coil 7, and the normally open contact of the fourth limit switch is connected in series with the fourth input relay coil 8.

[0022] The judgment protection circuit includes four input relay delay circuits connected in parallel. Each input relay delay circuit includes an output relay coil connected in series in the main circuit and normally open and normally closed contacts of the input relays connected in parallel. The normally open and normally closed contacts of the input relays are connected in series with the corresponding delay relay coils.

[0023] Reference Figure 3 The first input relay delay circuit includes a first input relay normally open contact 5.1 and a first input relay normally closed contact 5.2 connected in parallel. The first input relay normally open contact and the first delay relay coil 9 are connected in series. The first input relay normally closed contact and the second delay relay coil 10 are connected in series. In the main circuit after parallel connection, it is connected in series with the first output relay coil 17.

[0024] The second input relay delay circuit includes a second input relay normally open contact 6.1 and a second input relay normally closed contact 6.2 connected in parallel. The second input relay normally open contact is connected in series with the third delay relay coil 11, and the second input relay normally closed contact is connected in series with the fourth delay relay coil 12. The parallel main circuit is connected in series with the second output relay coil 18.

[0025] The third input relay delay circuit includes a normally open contact 7.1 and a normally closed contact 7.2 of the third input relay connected in parallel. The normally open contact of the third input relay is connected in series with the coil 13 of the fifth delay relay, and the normally closed contact of the third input relay is connected in series with the coil 14 of the sixth delay relay. The parallel main circuit is connected in series with the coil 19 of the third output relay.

[0026] The fourth input relay delay circuit includes a fourth input relay normally open contact 8.1 and a fourth input relay normally closed contact 8.2 connected in parallel. The fourth input relay normally open contact is connected in series with the seventh delay relay coil 15, and the fourth input relay normally closed contact is connected in series with the eighth delay relay coil 16. The parallel main circuit is connected in series with the fourth output relay coil 20.

[0027] The chain breakage protection control system for a slag remover includes an action output circuit comprising four normally open contacts of output relays. The four normally open contacts of the output relays are connected in series in pairs and then in parallel. The main circuit after the parallel connection is connected in series with the coil of the trip relay.

[0028] Reference Figure 4 The normally open contact 17.1 of the first output relay and the normally open contact 19.1 of the third output relay are connected in series, and the normally open contact 18.1 of the second output relay and the normally open contact 20.1 of the fourth output relay are connected in series. After the series connection, the two circuits are connected in parallel, and the main circuit after the parallel connection is connected in series with the trip relay coil 21.

[0029] Working principle: After the scraper of the slag remover rotates, the first limit switch 1 and the third limit switch 3 will operate simultaneously, and the second limit switch 2 and the fourth limit switch 4 will operate simultaneously.

[0030] The electrical circuit operation process when one side of the chain breaks:

[0031] Taking the side where the first and third limit switches are located as an example, when the chain on this side breaks, there are two possible scenarios:

[0032] 1) If the first limit switch is in the triggered state, the first input relay coil is energized, the normally open contact K5.1 of the first input relay is closed, the first time delay relay coil 9 is energized, the first time delay relay is closed after 90s, and the first output relay coil 17 is energized;

[0033] 2) If the first limit switch is in the untriggered state, the first input relay coil is not energized, the normally closed contact K5.2 of the first input relay is energized, the second time delay relay coil 10 is energized, the second time delay relay is energized after 90s, and the first output relay coil is energized;

[0034] In summary, once this chain breaks, the coil of the first output relay will definitely be energized;

[0035] 3) If the third limit switch is in the triggered state, the third input relay coil 7 is energized, the normally open contact K7.1 of the third input relay is closed, the fifth time delay relay coil 13 is closed after 90s, and the third output relay coil 19 is energized;

[0036] 4) If the third limit switch is in the untriggered state, the third input relay coil is not energized, the normally closed contact K7.2 of the third input relay is energized, the sixth time delay relay coil 14 is energized after 90s, and the third output relay coil 19 is energized;

[0037] In summary, once this chain breaks, the third output relay coil 19 will definitely be energized;

[0038] In summary, after the chain on the side where the first limit switch and the third limit switch are located breaks, the first output relay coil and the third relay coil will definitely be energized. K17.1 is the normally open contact of the first output relay and is in the energized state. K19.1 is the normally open contact of the third output relay and is in the energized state. As a result, the trip relay coil 21 is energized. K21.1 is the normally open contact of the trip relay. K21.1 is energized and sends out a trip signal.

[0039] To prevent malfunction of the protection system when a single limit switch fails:

[0040] Taking the first limit switch as an example, once the first limit switch is damaged, its output signal will no longer change. The first output relay coil is energized and K17.1 is engaged, but the third output relay coil is not energized and K19.1 is in the open state. The trip relay coil is not energized and K21.1 is open, so no trip signal will be sent falsely, thus preventing the protection from malfunctioning.

[0041] To prevent the protection system from failing to operate when a single limit switch fails:

[0042] Taking the first limit switch as an example, once the first limit switch is damaged, its output signal will no longer change, the first output relay coil will be energized, and K17.1 will be energized.

[0043] In this situation, if the chain on the side where the first and third limit switches are located actually breaks, at this moment...

[0044] 1) If the third limit switch is in the triggered state, the coil of the third input relay is energized, the normally open contact K7.1 of the third input relay is energized, the fifth time delay relay is energized after 90 seconds, and the coil of the third output relay is energized;

[0045] 2) If the third limit switch is in the untriggered state, the third input relay coil is not energized, the normally closed contact K7.2 of the third input relay is energized, the sixth time delay relay is energized after 90 seconds, and the third output relay coil is energized;

[0046] In summary, once this chain breaks, the third output relay will definitely be energized; K19.1 will engage.

[0047] This energizes the trip relay coil. K21.1 is the normally open contact of the trip relay. When K21.1 is energized, a trip signal is sent out to prevent the protection system from failing to operate.

[0048] The delay time in the first delay relay 9, the second delay relay 10, the third delay relay 11, the fourth delay relay 12, the fifth delay relay 13, the sixth delay relay 14, the seventh delay relay 15, and the eighth delay relay 16 is generally set to 90 seconds. The delay time t of this control system is adjusted according to the time t1 from the two adjacent scrapers to the limit switch during the low-speed operation of the chain. The delay time is usually set to t = t1 + (5-10) s.

[0049] By setting four limit switches, the failure of a single switch will not cause the protection to malfunction and trip the slag remover, nor will the failure of a single switch cause the protection to fail and damage the equipment.

Claims

1. A slag eliminator chain breakage protection control system characterized by: The composition comprises an action input circuit, a judgment protection circuit and an action output circuit; The action input circuit comprises four parallel travel switches, each of which is connected with a corresponding input relay coil in series; The judgment protection circuit comprises four parallel input relay delay circuits, each of which comprises an output relay coil connected in series in the main circuit and normally open contacts and normally closed contacts of the input relay connected in parallel, and the normally open contacts and the normally closed contacts of the input relay are connected with corresponding delay relay coils in series.

2. A chain breakage protection control system for a slag extractor as claimed in claim 1, characterized in that: The action output circuit comprises four output relay normally open contacts, and the four output relay normally open contacts are connected in series in pairs and then connected in parallel, and the main circuit connected in parallel is connected with a trip relay coil in series.

3. A chain breakage protection control system for a slag extractor as claimed in claim 2, characterized in that: Two of the four travel switches are installed at both ends of one side of the slag extractor, and the other two are installed at both ends of the other side of the slag extractor.

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