Early warning device for chain of slag extractor of coal-fired boiler

Abstract

The utility model relates to the technical field of early warning of slag extractor chains of coal-fired boilers, in particular to an early warning device for the slag extractor chains of the coal-fired boilers, which comprises a slag extractor body. A chain wheel is arranged in the slag extractor body, a chain is meshed with the outer surface of the chain wheel, a first rotating shaft is fixedly connected to the circle center of the chain wheel, and the end, away from the chain wheel, of the first rotating shaft penetrates through the slag extractor body and extends to a motor. Through the cooperation of the chain wheel, the chain, the first rotating shaft, the motor, the protection box, the mounting frame, the bolt, the safety mechanism and the sliding mechanism, the chain can be locked at the moment when the chain is broken, and the instant resilience force generated by the chain is buffered and released while the chain is locked; the problems that a tensioned chain can generate large resilience force at the moment of breakage, the instantaneous speed generated at the breakage end of the chain is large, and the chain makes contact with workers at the moment of breakage, so that large safety accidents are likely to be caused are solved.

Description

Technical Field

[0001] The utility model relates to the technical field related to early warning of a slag discharger chain of a coal-fired boiler, in particular to an early warning device for a slag discharger chain of a coal-fired boiler. Background Art

[0002] The slag discharger is a boiler slag discharge device. The carbon slag produced after the coal is burned in the boiler is pushed to the slag pit by the grate, and is dragged out of the furnace by the slag discharger to clear the slag accumulation. The broken conveying chain of the slag discharger is likely to cause a safety accident.

[0003] The utility model patent with announcement number CN209023674U discloses a chain-breaking protection device for a scraper chain, which belongs to the technical field related to chain-breaking protection, and aims to solve the problem that if the conveying chain is broken in the prior art and is not handled in time, the equipment will be damaged, and even a safety accident will be caused. Therefore, there is an urgent need for chain-breaking protection, and the device includes a power traction mechanism and a chain-breaking protection mechanism; wherein the power traction mechanism includes a housing, a partition, a driving sprocket, a driven sprocket, and a chain meshed with the driving sprocket and the driven sprocket, the driving sprocket and the driven sprocket are both rotatably installed in the housing, wing chain plates are fixed at equal intervals in the circumference of the chain, an opening aligned with the wing chain plate is opened on the housing, and the partition is located below the opening, and the chain-breaking protection mechanism includes an insulating plate fixed at the opening, a proximity switch installed on the insulating plate, a controller and an audible and visual alarm, the sensing surface of the proximity switch is aligned with the wing chain plate, the controller includes a processing module connected to the proximity switch and a control module for controlling the shutdown of the driving sprocket, a predetermined time is preset in the processing module, and the control module is connected to the audible and visual alarm. The scraper chain break protection device can be used to protect the scraper when the chain breaks, thereby avoiding damage to the scraper.

[0004] However, the above patent still has shortcomings: the patent utilizes a scraper chain break protection device to protect the scraper when the chain breaks and avoid damage to the scraper, but it does not have the function of locking the chain at the moment of chain breaking. Since the tight chain will generate a large rebound force at the moment of breaking, the instantaneous speed of the broken end of the chain is relatively large. At the moment of breaking, the chain contacts the workers, which can easily cause major safety accidents. Utility Model Content

[0005] In order to make up for the above deficiencies, the utility model provides an early warning device for the chain of a coal-fired boiler slag discharger to solve the problem proposed in the above background technology that the chain is not locked at the moment of chain breaking. Since the tight chain will generate a large rebound force at the moment of breaking, the instantaneous speed of the broken end of the chain is relatively large. At the moment of breaking, the chain contacts the workers, which can easily cause major safety accidents.

[0006] The technical solution of the utility model is:

[0007] A warning device for a slag discharger chain of a coal-fired boiler, comprising: a slag discharger body; a slag discharger body is provided with a slag discharger sprocket, an outer surface of the slag discharger is meshed with a chain, a first rotating shaft is fixedly connected to the center of the slag discharger, an end of the first rotating shaft away from the slag discharger sprocket passes through the slag discharger body and extends to a motor, the first rotating shaft is fixedly connected to an output end of the motor, the motor is fixedly connected to the slag discharger body, a protection box is provided on the outer surface of the chain, a mounting frame is provided on one side of the protection box, and the mounting frame is connected to the slag discharger body by bolts; a safety mechanism for locking a broken chain is provided inside the protection box; sliding mechanisms for relieving and buffering the rebound force generated by the broken chain are provided on both sides of the protection box; a warning mechanism for giving an early warning according to the chain moving speed is provided on the top of the inner wall of the protection box.

[0008] Preferably, two L-shaped positioning claws are provided inside the protective box, the middle part of the L-shaped positioning claws is fixedly connected to the second rotating shaft, and both ends of the second rotating shaft are fixedly connected to the protective box; the end of the L-shaped positioning claw away from the chain is fixedly connected to a one-way tooth, and the protective box is fixedly connected to a matching rack near the one-way tooth.

[0009] Preferably, one side of the L-shaped positioning claw is fixedly connected to a first fixed block, one side of the first fixed block is provided with a second fixed block, the second fixed block is fixedly connected to the protective box, and the first fixed block and the second fixed block are connected by a first spring.

[0010] Preferably, the sliding mechanism includes: sliders are fixedly connected to both sides of the protection box, sliding rods are slidably connected to the inside of the sliders, one end of the sliding rod is fixedly connected to a limiting block, and the other end of the sliding rod is fixedly connected to the installation frame; a second spring is arranged between the slider and the installation frame, and the second springs are respectively sleeved on the outer surface of the sliding rod.

[0011] Preferably, the warning mechanism includes: a speed sensor fixedly connected to the top of the inner wall of the protection box, a controller is provided on one side of the motor, an alarm is provided on one side of the controller, and the controller and the alarm are both fixedly connected to the slag discharger body; the speed sensor, the alarm and the motor are all electrically connected to the controller.

[0012] Preferably, damping pads are provided between the slider and the slide rod, and the damping pads are fixedly connected to the sliders respectively.

[0013] Preferably, the protection box and the installation frame are provided with matching through holes near the chain.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] Firstly, the utility model can lock the chain at the moment of chain breaking through the cooperation of the sprocket, chain, first rotating shaft, motor, protection box, mounting frame, bolts, safety mechanism and sliding mechanism, and at the same time buffer and release the instantaneous rebound force generated by the chain, thereby solving the problem that a tight chain will generate a large rebound force at the moment of breaking, resulting in a large instantaneous speed at the broken end of the chain, and the chain will contact the workers at the moment of breaking, which may easily cause a major safety accident.

[0016] Secondly, the cooperation of the sprocket, chain, first rotating shaft, motor, protection box, mounting frame, bolts and warning mechanism of the utility model makes it possible to judge whether the chain is slipping or stuck according to the moving speed of the chain, and then the automatic control device performs an emergency stop and alarms to remind the staff to repair, thereby reducing the probability of chain breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the early warning device of the slag discharger chain of a coal-fired boiler of the utility model;

[0018] Figure 2 For the utility model Figure 1 The enlarged structural diagram at A in the middle;

[0019] Figure 3 This is a schematic diagram of the internal structure of the protection box of the utility model;

[0020] Figure 4 This is a schematic diagram of the safety mechanism structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the connection structure between the motor and the slag discharger body of the utility model;

[0022] Figure 6 This is a schematic diagram of the warning mechanism structure of the utility model;

[0023] Figure 7 This is a schematic diagram of the sliding mechanism structure of the utility model;

[0024] Figure 8 It is a schematic diagram of the connection structure between the damping pad and the slider of the utility model.

[0025] In the figure:

[0026] 1. Slag discharger body; 2. Sprocket; 3. Chain; 4. First rotating shaft; 5. Motor; 6. Protection box; 7. Mounting frame; 8. Bolt; 9. Safety mechanism; 10. Sliding mechanism; 11. Warning mechanism; 12. L-shaped positioning claw; 13. Second rotating shaft; 14. One-way tooth; 15. Rack; 16. First fixed block; 17. Second fixed block; 18. First spring; 19. Sliding block; 20. Sliding rod; 21. Limiting block; 22. Second spring; 23. Speed ​​sensor; 24. Controller; 25. Alarm; 26. Damping pad; 27. Through hole. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figures 1 to 8 The utility model describes the above technical solution in detail through the following embodiments:

[0029] A coal-fired boiler slag machine chain early warning device, comprising: a slag machine body 1; a slag machine body 1 is provided with a sprocket 2 inside, a chain 3 is meshed on the outer surface of the sprocket 2, a first rotating shaft 4 is fixedly connected to the center of the sprocket 2, an end of the first rotating shaft 4 away from the sprocket 2 passes through the slag machine body 1 and extends to the motor 5, the first rotating shaft 4 is fixedly connected to the output end of the motor 5, the motor 5 is fixedly connected to the slag machine body 1, a protection box 6 is provided on the outer surface of the chain 3, a mounting frame 7 is provided on one side of the protection box 6, and the mounting frame 7 is connected to the slag machine body 1 by bolts 8; a locking safety mechanism 9 for a broken chain 3 is provided inside the protection box 6; sliding mechanisms for relieving and buffering the rebound force generated by the broken chain 3 are provided on both sides of the protection box 6. Mechanism 10; a warning mechanism 11 for giving an early warning according to the moving speed of the chain 3 is arranged on the top of the inner wall of the protection box 6, the motor 5 is started, the output end of the motor 5 drives the first rotating shaft 4, the first rotating shaft 4 drives the chain 3 through the sprocket 2, the warning mechanism 11 can detect the moving speed of the chain 3 in real time, so that the chain 3 can be judged to be slipping or stuck according to the moving speed of the chain 3, and then the automatic control device performs an emergency stop and an alarm to remind the staff to repair, thereby reducing the probability of the chain 3 breaking. At the same time, the safety mechanism 9 inside the protection box 6 can quickly lock the broken chain 3 at the moment of chain breaking, and the sliding mechanism 10 can buffer the rebound force generated by the protection box 6 at the moment of chain 3 breaking.

[0030] like Figure 3 and Figure 4 As shown, the safety mechanism 9 includes: two L-shaped positioning claws 12 are arranged inside the protection box 6, the middle part of the L-shaped positioning claws 12 is fixedly connected to the second rotating shaft 13, and both ends of the second rotating shaft 13 are fixedly connected to the protection box 6; the end of the L-shaped positioning claw 12 away from the chain 3 is fixedly connected to the one-way tooth 14, and the protection box 6 is fixedly connected to the one-way tooth 14. A matching rack 15 is fixedly connected. When the chain 3 rebounds at the moment of breaking, the chain 3 pulls one end of the L-shaped positioning claw 12 so that the L-shaped positioning claw 12 rotates with the second rotating shaft 13 as the center, thereby driving the one-way tooth 14, so that the one-way tooth 14 is meshed with the rack 15, so as to achieve the purpose of limiting the nearest pin inside the chain 3, and then locking the chain 3.

[0031] like Figure 3 and Figure 4 As shown, one side of the L-shaped positioning claw 12 is fixedly connected with a first fixing block 16, and one side of the first fixing block 16 is provided with a second fixing block 17, the second fixing block 17 is fixedly connected to the protection box 6, and the first fixing block 16 and the second fixing block 17 are connected by a first spring 18. When the chain 3 is in normal operation, the pin inside the chain 3 pushes the inclined portion of the L-shaped positioning claw 12, so that the L-shaped positioning claw 12 rotates slightly with the second rotating shaft 13 as the center. When the pin inside the chain 3 passes through the L-shaped positioning claw 12, the first spring 18 pulls the first fixing block 16 through the second fixing block 17, and the first fixing block 16 drives the L-shaped positioning claw 12 to reset, which does not affect the normal operation of the chain 3.

[0032] like Figure 1 , Figure 2 and Figure 7 As shown, the sliding mechanism 10 includes: sliders 19 are fixedly connected to both sides of the protection box 6, and slide bars 20 are slidably connected inside the sliders 19, one end of the slide bars 20 is fixedly connected to the limiting block 21, and the other end of the slide bars 20 is fixedly connected to the mounting frame 7; a second spring 22 is arranged between the slider 19 and the mounting frame 7, and the second springs 22 are respectively sleeved on the outer surface of the slide bars 20. When the chain 3 breaks and the one-way teeth 14 are engaged with the rack 15, the rebound force of the chain 3 pulls the L-shaped positioning claw 12, and the L-shaped positioning claw 12 drives the protection box 6 through the second rotating shaft 13, and the protection box 6 drives the slider 19, so that the slider 19 slides on the surface of the slide bar 20 and squeezes the second spring 22 through the mounting frame 7. The second spring 22 buffers the rebound force generated by the chain 3 through its own elastic force.

[0033] like Figure 3 , Figure 5 and Figure 6As shown, the warning mechanism 11 includes: a speed sensor 23 is fixedly connected to the top of the inner wall of the protection box 6, a controller 24 is provided on one side of the motor 5, an alarm 25 is provided on one side of the controller 24, and the controller 24 and the alarm 25 are all fixedly connected to the slag discharger body 1; the speed sensor 23, the alarm 25 and the motor 5 are all electrically connected to the controller 24, the speed sensor 23 detects the moving speed of the chain 3, and transmits the detection data to the inside of the controller 24, when the data detection data changes, it is judged by default that the chain 3 is slipping or stuck, and then the controller 24 automatically stops the motor 5 and starts the alarm 25 to alarm, which reduces the probability of the chain 3 breaking and can prompt the staff to perform repairs in time.

[0034] like Figure 8 As shown, a damping pad 26 is provided between the slider 19 and the slide rod 20 . The damping pad 26 is fixedly connected to the slider 19 , respectively, and can buffer the rebound force generated by the second spring 22 on the slider 19 .

[0035] like Figure 1 , Figure 3 and Figure 7 As shown, the protection box 6 and the installation frame 7 are both provided with matching through holes 27 near the chain 3, so that the protection box 6 and the installation frame 7 do not affect the normal operation of the chain.

[0036] Working principle: start the motor 5, the output end of the motor 5 drives the first rotating shaft 4, and the first rotating shaft 4 drives the chain 3 through the sprocket 2. While the chain 3 is running, the speed sensor 23 detects the moving speed of the chain 3, and transmits the detection data to the inside of the controller 24. When the data detection data changes, it is judged by default that the chain 3 is slipping or stuck, and then the controller 24 automatically stops the motor 5 and starts the alarm 25 to alarm, which reduces the probability of chain 3 breaking and can prompt the staff to carry out maintenance in time. When the chain 3 is in normal operation, the pin inside the chain 3 pushes the inclined part of the L-shaped positioning claw 12, so that the L-shaped positioning claw 12 rotates slightly with the second rotating shaft 13 as the center. After the pin inside the chain 3 passes through the L-shaped positioning claw 12, the first spring 18 pulls the first fixed block 16 through the second fixed block 17, and the first fixed block 16 drives the L-shaped positioning claw 12 to reset, which will not affect the normal operation of the chain 3.

[0037] When the chain 3 rebounds at the moment of breaking, the chain 3 pulls one end of the L-shaped positioning claw 12 to make the L-shaped positioning claw 12 rotate around the second rotating shaft 13, thereby driving the one-way tooth 14, so that the one-way tooth 14 engages with the rack 15, thereby achieving the purpose of limiting the nearest pin inside the chain 3, and then locking the chain 3.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An early warning device for a slag discharger chain of a coal-fired boiler, comprising: Slag discharger body (1); The invention is characterized in that a sprocket (2) is arranged inside the slag discharger body (1), a chain (3) is meshed on the outer surface of the sprocket (2), a first rotating shaft (4) is fixedly connected to the center of the sprocket (2), an end of the first rotating shaft (4) away from the sprocket (2) passes through the slag discharger body (1) and extends to the motor (5), the first rotating shaft (4) is fixedly connected to the output end of the motor (5), the motor (5) is fixedly connected to the slag discharger body (1), a protection box (6) is arranged on the outer surface of the chain (3), a mounting frame (7) is arranged on one side of the protection box (6), and the mounting frame (7) is connected to the slag discharger body (1) by bolts (8); A safety mechanism (9) for locking a broken chain (3) is provided inside the protection box (6); Sliding mechanisms (10) are provided on both sides of the protection box (6) for relieving and buffering the rebound force generated by the broken chain (3); The top of the inner wall of the protection box (6) is provided with a warning mechanism (11) for providing an early warning according to the moving speed of the chain (3).

2. The early warning device for the slag discharger chain of a coal-fired boiler according to claim 1, characterized in that: The safety mechanism (9) comprises: Two L-shaped positioning claws (12) are arranged inside the protection box (6), the middle of each L-shaped positioning claw (12) is fixedly connected to a second rotating shaft (13), and both ends of the second rotating shaft (13) are fixedly connected to the protection box (6); The end of the L-shaped positioning claw (12) away from the chain (3) is fixedly connected to a one-way tooth (14), and the protection box (6) is fixedly connected to a matching rack (15) near the one-way tooth (14).

3. The early warning device for the slag discharger chain of a coal-fired boiler according to claim 2, characterized in that: One side of the L-shaped positioning claw (12) is fixedly connected to a first fixing block (16), one side of the first fixing block (16) is provided with a second fixing block (17), the second fixing block (17) is fixedly connected to the protection box (6), and the first fixing block (16) and the second fixing block (17) are connected via a first spring (18).

4. The early warning device for the slag discharger chain of a coal-fired boiler according to claim 3, characterized in that: The sliding mechanism (10) comprises: Both sides of the protection box (6) are fixedly connected with sliders (19), the interior of the sliders (19) is slidably connected with slide rods (20), one end of the slide rods (20) is fixedly connected to a limit block (21), and the other end of the slide rods (20) is fixedly connected to the installation frame (7); A second spring (22) is provided between the sliding block (19) and the mounting frame (7), and the second spring (22) is sleeved on the outer surface of the sliding rod (20).

5. The early warning device for the slag discharger chain of a coal-fired boiler according to claim 4, characterized in that: The warning mechanism (11) comprises: A speed sensor (23) is fixedly connected to the top of the inner wall of the protection box (6); a controller (24) is provided on one side of the motor (5); an alarm (25) is provided on one side of the controller (24); and both the controller (24) and the alarm (25) are fixedly connected to the slag discharger body (1); The speed sensor (23), the alarm (25) and the motor (5) are all electrically connected to the controller (24).

6. The early warning device for the slag discharger chain of a coal-fired boiler according to claim 5, characterized in that: Damping pads (26) are provided between the sliding blocks (19) and the sliding rods (20), and the damping pads (26) are respectively fixedly connected to the sliding blocks (19).

7. The early warning device for the slag discharger chain of a coal-fired boiler according to claim 6, characterized in that: The protection box (6) and the installation frame (7) are both provided with matching through holes (27) near the chain (3).

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