Quick replacement rotary kiln fish scale sealing structure device

Abstract

The application discloses a quick-replacement rotary kiln fish scale sealing structure device, which comprises a fish scale, a flange fixing frame, a fish scale support frame and a rolling bearing adjusting device. The flange fixing frame comprises a fixing frame connecting part and a circular arc plate. The fixing frame connecting part is fixed with a kiln tail dust collecting fixed cover. The inner side of the circular arc plate is arranged close to the outer shell of the rotary kiln. The fish scale support frame comprises a support frame connecting part and a bearing support part. The support frame connecting part is fixed with the fixing frame connecting part through a flange fixing bolt assembly. The bearing support part is provided with a bearing pin shaft clamping groove and a support frame threaded hole. One end of the fish scale is fixed with the support frame connecting part through a fish scale fixing bolt assembly. The other end of the fish scale is attached to the outer shell of the rotary kiln. A sealing cavity is formed among the fish scale, the flange fixing frame, the fish scale support frame and the outer shell of the rotary kiln. A plurality of rolling bearing adjusting devices are arranged in the sealing cavity. The structure device can quickly replace the sealing fish scale, and the operation personnel are safer.

Description

Technical Field

[0001] This invention relates to rotary kilns, and more particularly to a quick-change rotary kiln fish-scale sealing structure device for sealing between the kiln tail dust collection fixing cover and the rotary kiln tail shell. Background Technology

[0002] A rotary kiln (also known as a rotary calcining kiln) belongs to the building materials equipment category. Rotary kilns can be classified into cement kilns, metallurgical and chemical kilns, and lime kilns based on the materials they process. Cement kilns are mainly used for calcining cement clinker and are divided into two main categories: dry-process cement kilns and wet-process cement kilns. Metallurgical and chemical kilns are mainly used in the metallurgical industry for magnetizing and roasting lean iron ore in steel plants; oxidizing and roasting chromium and nickel iron ore; roasting high-alumina vanadium ore in refractory material plants and roasting clinker and aluminum hydroxide in aluminum plants; and roasting chromite sand and chromite powder in chemical plants. Lime kilns (i.e., active lime kilns) are used for roasting active lime and lightly calcined dolomite for steel plants and ferroalloy plants. Rotary kilns are classified by shape into variable-diameter rotary kilns and standard-diameter rotary kilns; by application into cement rotary kilns, ceramsite rotary kilns, kaolin rotary kilns, lime rotary kilns, etc.; and by energy supply efficiency into gas-fired rotary kilns, coal-fired rotary kilns, and mixed-fuel rotary kilns.

[0003] Inside a rotary kiln, the material flow direction and the process hot air flow direction are generally opposite. Due to the high internal temperature of the rotary kiln, the material easily generates a large amount of dry dust. A significant portion of this dust accumulates towards the kiln tail under the influence of the hot air. The sealing material between the kiln tail dust collection hood and the rotary kiln tail shell is usually made of stainless steel sheets with excellent toughness and elasticity, often referred to as fish scales. Due to their rapid wear, these fish scales need to be replaced frequently on-site.

[0004] The sealing fish scales are composed of hundreds of stainless steel sheets that are staggered and stacked to form a complete circle. They are then fixed by the fish scale fixing bolt assembly. When replacing the stainless steel sealing fish scales in the entire circumference of the kiln tail hood, the replacement personnel need to replace them one by one around the entire circle of the kiln tail dust collection fixing hood. This work is quite time-consuming and labor-intensive. Summary of the Invention

[0005] Purpose of the invention: This invention addresses the problem of time-consuming and labor-intensive replacement of rotary kiln sealing fish scales by providing a rotary kiln fish scale sealing structure device for quick replacement.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A quick-change rotary kiln fish-scale sealing structure device includes fish-scales, a flange fixing frame, a fish-scale support frame, and a rolling bearing adjustment device.

[0008] The flange fixing frame includes a fixing frame connecting part and an arc plate. The fixing frame connecting part is fixed to the kiln tail dust collection fixing cover. The inner side of the arc plate is set close to the outer shell of the rotary kiln. The fish scale support frame includes a support frame connecting part and a bearing support part. The support frame connecting part is fixed to the fixing frame connecting part by a flange fixing bolt assembly. The bearing support part is provided with a bearing pin groove and a support frame threaded hole. One end of the fish scale is fixed to the support frame connecting part by a fish scale fixing bolt assembly. The other end of the fish scale is attached to the outer shell of the rotary kiln. A sealed cavity is formed between the fish scale, the flange fixing frame, the fish scale support frame, and the outer shell of the rotary kiln. Multiple rolling bearing adjustment devices are evenly arranged in the circumferential direction in the sealed cavity.

[0009] The rolling bearing adjustment device includes a bearing pin, a rolling bearing, a double-threaded rod, a preload nut, and a preload spring. The inner ring of the rolling bearing is installed at one end of the bearing pin, and the outer ring of the rolling bearing contacts the outer side of the arc plate. The other end of the bearing pin is provided with a bearing pin end key, which forms a radial moving pair with the bearing pin groove. The bearing pin has a bearing pin through hole in the middle, and the double-threaded rod passes through the bearing pin through hole. One end of the double-threaded rod is provided with a threaded rod end thread, which forms a first threaded pair with the threaded hole of the support frame. A middle thread is provided on the double-threaded rod near the threaded rod end thread, which forms a second threaded pair with the preload nut. The second threaded pair has the opposite thread direction to the first threaded pair, and the thread diameter of the second threaded pair is larger than that of the first threaded pair. The other end of the double-threaded rod is provided with a limiting boss, and the preload spring is fitted on the double-threaded rod and fixed by the preload nut.

[0010] Furthermore, the outer side of the arc plate is provided with radial protrusions for axially limiting the rolling bearing.

[0011] Furthermore, the first threaded pair is a left-hand threaded pair, and the second threaded pair is a right-hand threaded pair.

[0012] Furthermore, the support frame connecting part of the fish scale support frame is evenly distributed with multiple support frame ash return ports along the circumferential direction, and the lower end of the fixing frame connecting part of the flange fixing frame is provided with a fixing frame ash return port corresponding to the support frame ash return port. The sealing cavity is connected to the kiln tail dust collection fixing hood through the support frame ash return port and the fixing frame ash return port.

[0013] Furthermore, it also includes an ash-blocking ring, which is fixed to the tail shell of the rotary kiln, and a labyrinth groove sealing structure is formed between the ash-blocking ring and the fixing bracket connection of the flange fixing bracket.

[0014] Furthermore, the support frame connecting part is provided with a support frame mounting through hole, the fixing frame connecting part is provided with a support frame mounting threaded hole, and the fixing bolt of the flange fixing bolt assembly passes through the support frame mounting through hole and then connects to the support frame mounting threaded hole.

[0015] Furthermore, the support frame connecting part and the fish scale are provided with fish scale mounting through holes, and the fixing bolts of the fish scale fixing bolt assembly pass through the fish scale mounting through holes of the support frame connecting part and the fish scale before being connected to the fixing nut.

[0016] Beneficial effects: Using this structure and device allows for easy and quick replacement of stainless steel sealing fish scales, and enhances operator safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rotary kiln fish scale sealing structure device of the present invention;

[0018] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 A three-dimensional diagram of the fish scale support frame;

[0020] Figure 4 This is the front view of the fish scale support frame;

[0021] Figure 5 This is the front view of the rolling bearing adjustment device;

[0022] Figure 6 This is a top view of the rolling bearing adjustment device;

[0023] Figure 7 This is a schematic diagram of the structure of a bidirectional threaded rod;

[0024] Figure 8 This is a schematic diagram of the structure of fish scales;

[0025] In the diagram: 1-Feed pipe; 2-Kiln tail dust collector fixing hood; 3-Sealing cavity; 4-Rotary kiln; 5-Fish scale plate; 6-Fish scale plate fixing bolt assembly; 7-Flange fixing bracket; 7a-Arc plate; 7b-Fixing bracket connection part; 7c-Fixing bracket ash return port; 7d-Radial protrusion; 8-Ash blocking ring; 9-Fish scale plate support frame; 9a-Support frame ash return port; 9b-Support frame threaded hole; 9c-Bearing pin groove; 9d-Fish scale plate mounting through hole; 9e - Support frame mounting through hole; 9f - Support frame connecting part; 9g - Bearing support part; 10 - Flange fixing bolt assembly; 11 - Double-sided threaded rod; 11a - Threaded rod intermediate thread; 11b - Threaded rod end thread; 12 - Preload nut; 13 - Preload spring; 14 - Bearing pin; 14a - Bearing pin through hole; 14b - Bearing pin end key; 15 - Rolling bearing; 16 - Labyrinth groove sealing structure; 17 - Annular gap. Detailed implementation method:

[0026] The invention will now be further explained with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2 As shown, a quick-change rotary kiln fish scale sealing structure device of the present invention includes fish scales 5, flange fixing frame 7, fish scale support frame 9, and rolling bearing adjustment device.

[0028] The flange fixing bracket 7 includes a fixing bracket connecting part 7b and an arc plate 7a. The fixing bracket connecting part 7b is welded and fixed to the kiln tail dust collection fixing cover 2. The inner side of the arc plate 7a is set close to the outer shell of the rotary kiln 4, and an annular gap 17 is formed between the arc plate 7a and the outer shell of the rotary kiln 4.

[0029] like Figure 3 and Figure 4 As shown, the fish scale support frame 9 includes a support frame connecting part 9f and a bearing support part 9g. The support frame connecting part 9f is fixed to the fixed frame connecting part 7b by a flange fixing bolt assembly 10. The support frame connecting part 9f has a support frame mounting through hole 9e, and the fixed frame connecting part 7b has a support frame mounting threaded hole. The fixing bolts of the flange fixing bolt assembly 10 pass through the support frame mounting through hole 9e and then connect to the support frame mounting threaded hole. The bearing support part 9g has a bearing pin groove 9c and a support frame threaded hole 9b for supporting and mounting a rolling bearing adjustment device.

[0030] like Figure 8 As shown, one end of the fish scale 5 is fixed to the support frame connection part 9f by the fish scale fixing bolt assembly 6, and the other end of the fish scale 5 is attached to the outer shell of the rotary kiln 4. The support frame connection part 9f and the fish scale 5 are provided with fish scale mounting through holes 9d. The fixing bolts of the fish scale fixing bolt assembly 6 pass through the support frame connection part 9f and the fish scale mounting through holes 9d of the fish scale 5 and are then connected to the fixing nut.

[0031] A sealed cavity 3 is formed between the fish scale 5, the flange fixing frame 7, the fish scale support frame 9, and the outer shell of the rotary kiln 4. Multiple rolling bearing adjustment devices are evenly arranged in the circumferential direction inside the sealed cavity 3.

[0032] like Figures 5 to 7 As shown, the rolling bearing adjustment device includes a bearing pin 14, a rolling bearing 15, a double-threaded rod 11, a preload nut 12, and a preload spring 13. The inner ring of the rolling bearing 15 is installed at one end of the bearing pin 14, and the outer ring of the rolling bearing 15 contacts the outer side of the arc plate 7a. The other end of the bearing pin 14 is provided with a bearing pin end key 14b. The bearing pin end key 14b and the bearing pin groove 9c form a radial moving pair. The bearing pin end key 14b can be inserted into the bearing pin groove 9c and can move in the radial direction of the rotary kiln. The bearing pin 14 is provided with a bearing pin through hole 14a in the middle.

[0033] A bidirectional threaded rod 11 is inserted into the bearing pin through hole 14a. One end of the bidirectional threaded rod 11 is provided with a threaded rod end thread 11b, which forms a first threaded pair with the support frame threaded hole 9b. A threaded rod middle thread 11a is provided near the threaded rod end thread 11b of the bidirectional threaded rod 11. The threaded rod middle thread 11a and the preload nut 12 form a second threaded pair. The thread direction of the second threaded pair is opposite to that of the first threaded pair. The first threaded pair is a left-hand threaded pair, and the second threaded pair is a right-hand threaded pair. The thread diameter of the second threaded pair is larger than that of the first threaded pair to ensure that the preload nut can enter from the threaded rod end thread direction. A limiting boss is provided at the other end of the bidirectional threaded rod 11 to prevent the bidirectional threaded rod 11 from disengaging from the bearing pin 14. A preload spring 13 is fitted on the bidirectional threaded rod 11 and fixed by the preload nut 12. The preload spring 13 applies a tension force in the radial direction of the rotary kiln towards the bearing pin 14. When the outer roundness value of the arc plate 7a deviates significantly, it is only necessary to adjust the tension between the preload nut 12 and the preload spring 13 one by one.

[0034] In this invention, the outer side of the arc plate 7a is provided with a radial protrusion 7d, which is used to axially limit the rolling bearing 15 and prevent it from detaching from the outer side of the arc plate 7a.

[0035] like Figure 2 As shown, in order to prevent excessive dust inside the kiln tail dust collection fixed cover 2 from entering the sealed cavity 3 through the annular gap 17 between the arc plate 7a and the outer shell of the rotary kiln 4, and to prevent damage to the rolling bearing adjustment device, a dust-blocking ring 8 is set at the front end of the annular gap 17. The dust-blocking ring 8 is welded and fixed to the tail shell of the rotary kiln 4. A labyrinth groove sealing structure 16 is formed between the dust-blocking ring 8 and the fixing bracket connection part 7b of the flange fixing bracket 7. The labyrinth groove sealing structure 16 is a funnel-shaped groove. The funnel-shaped groove is wider at one end connected to the kiln tail dust collection fixed cover 2 and narrower at the other end connected to the annular gap 17, which can prevent most of the powder from entering the sealed cavity 3 formed between the fish scale plate 5 and the rotary kiln 4.

[0036] After the rotary kiln 4 has been working for a period of time, a small amount of powder will pass through the labyrinth groove sealing structure 16 and enter the sealing cavity 3 through the annular gap 17 between the arc plate 7a and the outer shell of the rotary kiln 4. In order to prevent the powder from accumulating in the sealing cavity 3, the support frame connecting part 9f of the fish scale support frame 9 is evenly distributed with multiple support frame return ash ports 9a in the circumferential direction. The lower end of the fixing frame connecting part 7b of the flange fixing frame 7 is provided with a fixing frame return ash port 7c corresponding to the support frame return ash port 9a. The sealing cavity 3 is connected to the kiln tail dust collection fixing cover 2 through the support frame return ash port 9a and the fixing frame return ash port 7c.

[0037] In this invention, the support frame connecting part 9f of the fish scale support frame 9 has twelve support frame return ash ports 9a evenly distributed along the circumferential direction, and at the same angle, twelve support frame mounting through holes 9e are evenly provided in the same direction as the number of support frame return ash ports 9a. The lower end of the fixing frame connecting part 7b of the flange fixing frame 7 is provided with three fixing frame return ash ports 7c, which correspond to three adjacent support frame return ash ports 9a on the fish scale support frame 9.

[0038] When the powder enters the sealed cavity 3 formed between the fish scale 5 and the rotary kiln 4, under the continuous rotation of the rotary kiln 4 and the suction force of the hot air system, the powder will flow out through the three ash return ports at the lower end of the flange fixing frame 7 and the fish scale support frame 9, and then be discharged through the ash outlet of the kiln tail dust collection fixing hood 2.

[0039] When the fish scales are worn and need to be replaced, all flange fixing bolt assemblies 10 are disassembled. Then, the fish scale support bracket 9 can be easily rotated by hand to any angle position to replace any worn fish scale 5. After all the fish scales 5 that need to be replaced have been replaced, all flange fixing bolt assemblies 10 can be installed. The workload of disassembling and installing a small number of flange fixing bolt assemblies 10 is relatively small.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A quick change rotary kiln fish plate seal structure device, characterized in that: Includes fish scales, flange fixing bracket, fish scale support bracket, and rolling bearing adjustment device; The flange fixing frame includes a fixing frame connecting part and an arc plate. The fixing frame connecting part is fixed to the kiln tail dust collection fixing cover. The inner side of the arc plate is set close to the outer shell of the rotary kiln. The fish scale support frame includes a support frame connecting part and a bearing support part. The support frame connecting part is fixed to the fixing frame connecting part by a flange fixing bolt assembly. The bearing support part is provided with a bearing pin groove and a support frame threaded hole. One end of the fish scale is fixed to the support frame connecting part by a fish scale fixing bolt assembly. The other end of the fish scale is attached to the outer shell of the rotary kiln. A sealed cavity is formed between the fish scale, the flange fixing frame, the fish scale support frame, and the outer shell of the rotary kiln. Multiple rolling bearing adjustment devices are evenly arranged in the circumferential direction in the sealed cavity. The rolling bearing adjustment device includes a bearing pin, a rolling bearing, a double-threaded rod, a preload nut, and a preload spring. The inner ring of the rolling bearing is installed at one end of the bearing pin, and the outer ring of the rolling bearing contacts the outer side of the arc plate. The other end of the bearing pin is provided with a bearing pin end key, which forms a radial moving pair with the bearing pin groove. The bearing pin has a bearing pin through hole in the middle, and the double-threaded rod passes through the bearing pin through hole. One end of the double-threaded rod is provided with a threaded rod end thread, which forms a first threaded pair with the threaded hole of the support frame. A middle thread is provided on the double-threaded rod near the threaded rod end thread, which forms a second threaded pair with the preload nut. The second threaded pair has the opposite thread direction to the first threaded pair, and the thread diameter of the second threaded pair is larger than that of the first threaded pair. The other end of the double-threaded rod is provided with a limiting boss, and the preload spring is fitted on the double-threaded rod and fixed by the preload nut.

2. The rotary kiln fish-scale sealing structure device for quick replacement according to claim 1, characterized in that: The outer side of the arc plate has radial protrusions for axially limiting the rolling bearing.

3. The rotary kiln fish-scale sealing structure device for quick replacement according to claim 1, characterized in that: The first threaded pair is a left-hand threaded pair, and the second threaded pair is a right-hand threaded pair.

4. The rotary kiln fish-scale sealing structure device for quick replacement according to claim 1, characterized in that: The fish scale support frame has multiple support frame return ports evenly distributed along the circumference of the support frame connection part. The flange fixing frame has a fixing frame return port corresponding to the support frame return port at the lower part of the fixing frame connection part. The sealing cavity is connected to the kiln tail dust collection fixing hood through the support frame return port and the fixing frame return port.

5. The rotary kiln fish-scale sealing structure device for quick replacement according to claim 1, characterized in that: It also includes an ash-blocking ring, which is fixed to the tail shell of the rotary kiln, and a labyrinth groove sealing structure is formed between the ash-blocking ring and the fixing bracket connection of the flange fixing bracket.

6. The rotary kiln fish-scale sealing structure device for quick replacement according to claim 1, characterized in that: The support frame connecting part is provided with a support frame mounting through hole, and the fixed frame connecting part is provided with a support frame mounting threaded hole. The fixing bolts of the flange fixing bolt assembly pass through the support frame mounting through hole and then connect to the support frame mounting threaded hole.

7. The rotary kiln fish-scale sealing structure device for quick replacement according to claim 1, characterized in that: The support frame connecting part and the fish scale are provided with fish scale mounting through holes. The fixing bolts of the fish scale fixing bolt assembly pass through the fish scale mounting through holes of the support frame connecting part and the fish scale and are then connected to the fixing nut.

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