A double-labyrinth seal device for a movable grate bed of a grate cooler

Abstract

The utility model discloses a kind of inter-row double-labyrinth sealing devices of movable grate bed of grate cooler, including the M-shaped sealing cover and U-shaped sealing strip fixed in two adjacent conveying beams respectively;M-shaped sealing cover side wing plate is connected with first conveying beam using fixing screw, U-shaped sealing strip bottom plate is connected with second conveying beam using fixing bolt, and two form two-stage labyrinth passage after insertion.The structure makes clinker to leak twice steering, significantly reduces the amount of leakage;Wear is dispersed to two independent parts, and service life is extended;And allow to enlarge gap, reduce manufacturing installation precision requirement;When maintaining, it can be quickly replaced by only loosening respective fastener, downtime is short, suitable for the inter-row sealing of fourth generation movable grate bed of grate cooler.

Description

Technical Field

[0001] This utility model relates to a double labyrinth sealing device between rows of movable grate beds in a grate cooler. Background Technology

[0002] The grate cooler is a key cooling device in the cement clinker calcination system. Its "movable grate bed" consists of multiple rows of parallel conveyor beams. Each row of conveyor beams reciprocates longitudinally (in the direction of material movement) to achieve the conveying and cooling of clinker. To prevent high-temperature clinker from leaking downwards into the cooling air chamber through the gaps between adjacent rows of beams, fourth-generation grate coolers generally incorporate a labyrinth seal structure between the rows.

[0003] In existing technologies, the most common approach is to fix "L-shaped" or "N-shaped" sealing strips to the top surface of adjacent conveyor beams, forming a single-stage labyrinth channel through the interlocking of the two sealing strips, using multiple bends to hinder the falling of clinker particles. However, actual operation has shown that this structure has the following drawbacks: The sealing strip is a single-sided cantilever bearing force. Under the continuous scouring of high-temperature clinker and the reciprocating impact of the beam, the sealing plate is very easy to wear, deform or even fall off. Once it falls off, a straight gap is formed, and the amount of material leakage increases sharply.

[0004] As the labyrinth gaps wear out, they gradually widen and cannot be automatically compensated for, leading to irreversible deterioration of the sealing effect. When leaked clinker enters the air chamber, it causes blockage of the air chamber, wear of the fan impeller, and an increase in equipment failure rate.

[0005] Because there is only a single-stage labyrinth, clinker particles can penetrate the seal with just one turn, resulting in a short sealing path and limited material resistance.

[0006] Maintenance requires stopping the machine and entering the air chamber to remove multiple sets of bolts and replace the entire sealing plate. This process is time-consuming, labor-intensive, and severely impacts the production line's operating rate.

[0007] Therefore, the existing inter-column labyrinth sealing structure still has significant shortcomings in terms of sealing reliability, service life and ease of maintenance, and there is an urgent need to propose a new structure with better sealing performance, longer service life and easy quick replacement. Summary of the Invention

[0008] This utility model provides a double labyrinth sealing device between rows of movable grate beds in a grate cooler to solve the problems existing in the prior art.

[0009] The technical solutions adopted in this utility model are as follows: A double labyrinth sealing device for the movable grate bed of a grate cooler, used to seal the gap between adjacent first and second conveying beams, comprising: The M-shaped sealing cover has one side wing plate fastened to the top surface of the first conveying beam by fixing screws; The U-shaped sealing strip has its base plate fastened to the top surface of the second conveying beam by fixing bolts. The other wing plate of the M-shaped sealing cover is inserted into the groove of the U-shaped sealing strip. During the relative movement of the two, they form a two-stage labyrinth channel to prevent clinker from leaking downwards.

[0010] Furthermore, both the M-shaped sealing cap and the U-shaped sealing strip are made of heat-resistant and wear-resistant alloy.

[0011] Furthermore, the two-stage labyrinthine channel formed between the M-shaped sealing cap and the U-shaped sealing strip is a corner channel.

[0012] This utility model has the following beneficial effects: (1) The M-type sealing cover and the U-type sealing strip are interlocked to form a two-stage corner channel. The clinker particles need to turn about 90° twice to leak downwards, which significantly increases the material penetration resistance. The amount of material leakage in the field is reduced compared with the original single labyrinth structure.

[0013] (2) The sealing contact surface changes from "single cantilever" to "double interlocking", and the friction pair is distributed to two independent parts, the M-type sealing cover and the U-type sealing strip. The labyrinth effect can still be maintained after either part is worn, thus improving the overall service life and reducing the replacement frequency.

[0014] (3) The two-level labyrinth allows for an appropriate increase in the initial gap while ensuring sealing, reducing the dependence on the forming curvature of the sealing strip and the on-site installation positioning accuracy, widening the manufacturing tolerance range, and reducing processing and assembly costs.

[0015] (4) The M-type sealing cover is detachably connected to the corresponding conveying beam by only fixing screws and the U-type sealing strip is detachably connected by only fixing bolts. During maintenance, the old parts can be pulled out and the new parts can be installed by loosening the fasteners. There is no need to enter the air chamber, which shortens the downtime maintenance time. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the present utility model. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, this utility model discloses a double labyrinth sealing device between rows of a grate cooler's movable grate bed. It is mainly used to seal the gap between adjacent first and second conveying beams in the movable grate bed of the grate cooler, thereby preventing high-temperature clinker from leaking downwards into the cooling air chamber through the gap and ensuring the stable operation of the entire grate cooler equipment.

[0019] During device assembly, the first step is to secure the M-type sealing cover 1. One side wing of the M-type sealing cover 1 is precisely fitted against the pre-set installation point on the top surface of the first conveyor beam. Then, using a suitable fixing screw, it is passed through the pre-drilled installation holes on the side wing of the M-type sealing cover 1, firmly securing the M-type sealing cover 1 to the top surface of the first conveyor beam. This ensures that the M-type sealing cover 1 can reciprocate synchronously with the first conveyor beam without loosening or shifting during movement. After securing the M-type sealing cover 1, the U-type sealing strip 2 is installed. The base plate of the U-type sealing strip 2 is smoothly fitted against the corresponding installation area on the top surface of the second conveyor beam. Fixing bolts are then passed through the fixing holes on the base plate of the U-type sealing strip 2, completing the secure connection between the U-type sealing strip 2 and the second conveyor beam. At this point, the M-type sealing cover 1 and the U-type sealing strip 2 are arranged opposite each other.

[0020] After the basic fixing process is completed, the other wing plate of the M-shaped sealing cover 1 is precisely inserted into the groove of the U-shaped sealing strip 2, so that the M-shaped sealing cover 1 and the U-shaped sealing strip 2 form an interlocking assembly structure. At the same time, a suitable movable gap is reserved between the two to fully accommodate the reciprocating relative movement of the first conveying beam and the second conveying beam, avoiding jamming during movement. As the two conveying beams drive the M-shaped sealing cover 1 and the U-shaped sealing strip 2 to move relative to each other, their interlocking structure will naturally form a two-stage labyrinth channel 3. This two-stage labyrinth channel 3 is a corner channel. Compared with the traditional single-stage labyrinth structure, if clinker particles are to leak downwards, they need to complete two approximately 90° turns. This structural design significantly increases the penetration resistance of clinker particles, effectively preventing clinker from leaking downwards and greatly reducing the occurrence of leakage.

[0021] In this utility model, both the M-type sealing cover 1 and the U-type sealing strip 2 are made of heat-resistant and wear-resistant alloy material. This material can be well adapted to the high-temperature working environment inside the grate cooler, and at the same time has excellent wear resistance. It can effectively delay the wear of the M-type sealing cover 1 and the U-type sealing strip 2 caused by clinker erosion and friction between parts during long-term use, and avoid the problem of gap expansion in the sealing structure due to rapid wear, thereby ensuring the long-term stable use of the sealing structure.

[0022] During the actual operation of the grate cooler, the cold air in the cooling air chamber can be blown onto the grate bed through the gaps in the two-stage labyrinth channels 3, assisting in the cooling of the clinker. Simultaneously, high-pressure air from the front end can enter the two-stage labyrinth channels 3, blowing any clinker ash that accidentally enters the sealing structure to the end of the channel, preventing the ash from accumulating and causing blockage or increased wear in the sealing gaps. When the sealing components are worn and require repair or replacement, operators do not need to enter the air chamber. They only need to loosen the fixing screws of the M-type sealing cover 1 and the fixing bolts of the U-type sealing strip 2 to remove the old M-type sealing cover 1 and U-type sealing strip 2. Then, the new sealing components can be fixed according to the assembly steps described above, significantly shortening downtime for maintenance and reducing the labor intensity of maintenance.

[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A double labyrinth sealing device between rows of a grate cooler's movable grate bed, used to seal the gap between adjacent first and second conveying beams, characterized in that: include: M-type sealing cover (1), one side wing plate of the M-type sealing cover (1) is fastened to the top surface of the first conveying beam by fixing screws; U-shaped sealing strip (2), the bottom plate of which is fastened to the top surface of the second conveying beam by fixing bolts; The other side wing of the M-shaped sealing cover (1) is inserted into the groove of the U-shaped sealing strip (2), and the two form a two-stage labyrinth channel (3) during relative movement to prevent clinker from leaking downward.

2. The inter-row double labyrinth sealing device for the movable grate bed of the grate cooler as described in claim 1, characterized in that: The M-shaped sealing cap (1) and the U-shaped sealing strip (2) are both made of heat-resistant and wear-resistant alloy.

3. The inter-row double labyrinth sealing device for the movable grate bed of the grate cooler as described in claim 1, characterized in that: The two-level labyrinthine passage (3) formed between the M-shaped sealing cap (1) and the U-shaped sealing strip (2) is a corner passage.

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