Rotary kiln tailings conveyor

Abstract

This utility model discloses a rotary kiln tail waste conveying device, including a conical hopper. The inner wall of the conical hopper is provided with a refractory castable layer. A square grid screen is provided inside the conical hopper, and each side of the square grid screen is fixed on the refractory castable layer. An electric slide gate valve is provided at the discharge port of the conical hopper, and the discharge port of the conical hopper is connected to the inlet end of a bucket elevator. The discharge end of the bucket elevator is connected to a tubular screw conveyor, which is connected to a raw material discharge pipe. The raw material discharge pipe is connected to a waste buffer box. This utility model can achieve fully enclosed conveying of waste materials above 500℃. By installing a conical hopper on the discharge pipe at the kiln tail, the discharge pipe is isolated from the outside environment. The electric slide gate valve can isolate the material and cool it to a conveyable temperature, thereby accurately maintaining the negative pressure at the kiln tail. The fluctuation range of the negative pressure at the kiln tail is reduced from ±20Pa to ±5Pa, reducing calcination energy consumption. The jamming frequency of the flap valve is reduced by 95%, reducing labor costs.

Description

Technical Field

[0001] This utility model belongs to the technical field of waste conveying equipment, and relates to a waste conveying device for the tail of a rotary kiln. Background Technology

[0002] In the rotary kiln calcination process, the temperature of the kiln tail waste (such as dust and incompletely reacted raw materials) typically reaches over 500℃. Current equipment configurations for transporting this waste include: two heavy-duty airlock flap valves (made of Q235B steel) installed at the kiln tail discharge port; each valve has an open ash collection box (made of carbon steel) at its bottom. The waste is then manually and mechanically transported to the raw material warehouse, with each transfer taking 1-1.5 hours and requiring at least 3 cleanings per shift. This results in fluctuations in the negative pressure at the kiln tail. The problem is that the flap valve is deformed and jammed due to high temperature (jamming occurs 1-2 times per shift), and the backflow of cold air causes the negative pressure at the kiln tail to fluctuate within a range of ±20Pa, resulting in a calcination efficiency decrease of 12%-15%. Due to the replacement of flap valves, unblocking of the feed pipe, and mechanical transfer of waste materials, local environmental pollution is easily caused. The dust emission concentration during the ash removal process is not less than 100mg / m³, the working environment is harsh, and the operation and maintenance costs are increased. Therefore, there is an urgent need for a high-temperature resistant, fully sealed waste material conveying device to achieve stable negative pressure and continuous safe and stable production. Utility Model Content

[0003] The purpose of this invention is to provide a rotary kiln tail waste conveying device, which solves the problem of negative pressure imbalance during rotary kiln tail waste conveying in the prior art.

[0004] The technical solution adopted by this utility model is a rotary kiln tail waste conveying device, including a conical hopper, the inner wall of which is provided with a refractory castable layer, a square grid screen is provided inside the conical hopper and each side of the square grid screen is fixed on the refractory castable layer, an electric slide valve is provided at the discharge port of the conical hopper and the discharge port of the conical hopper is connected to the inlet end of a bucket elevator, the discharge end of the bucket elevator is connected to a tubular screw conveyor, the tubular screw conveyor is connected to a raw material discharge pipe, and the raw material discharge pipe is connected to a waste buffer box.

[0005] The features of this utility model's rotary kiln tail waste conveying device also include:

[0006] The refractory castable layer is composed of three parts: binder, aggregate, and admixture. The thickness of the refractory castable layer is 100mm-110mm.

[0007] The square grid screen has a side length of 30mm-35mm, and the top of the conical hopper has an observation hole with a side length of 350mm-400mm.

[0008] The included angle between the conical hopper and the bucket elevator shall not be less than 60°, and the discharge port of the conical hopper shall be connected to the feed port of the bucket elevator through a pipe.

[0009] The bucket elevator is a chain elevator. The vertical deviation of the bucket elevator is no more than 0.3 / 1000mm. The chain of the bucket elevator is made of 310S stainless steel. The bucket elevator is equipped with a drive motor.

[0010] A speed reducer is installed on the drive motor side of the bucket elevator.

[0011] The bucket elevator casing is fixed together by flanges and studs. 3mm-5mm asbestos rope is wound around the studs, and a grease layer is placed between the studs and the asbestos rope.

[0012] The tubular screw conveyor is connected to the raw material discharge pipe via an elbow. The included angle between the tubular screw conveyor and the raw material discharge pipe is 50°-65° and the horizontal deviation is no more than 3mm. The inner shaft of the tubular screw conveyor is a seamless steel pipe of 65mm-80mm. The radius of curvature of the elbow is no less than 1.5 times the diameter of the inner shaft pipe.

[0013] The bucket elevator is equipped with a base at the bottom, and a fixing plate is fixed on the base by several bolts. Several shims are placed on the fixing plate, and each shim is close to the bolts. The bucket elevator is placed on the shims.

[0014] The beneficial effects of this utility model are:

[0015] This utility model of a rotary kiln tail waste conveying device enables fully enclosed conveying of waste materials at temperatures above 500℃. By installing a conical hopper on the discharge pipe at the kiln tail, the discharge pipe is isolated from the outside environment. An electric slide gate valve isolates the material, cooling it to a conveyable temperature, thus precisely maintaining the negative pressure at the kiln tail. The negative pressure fluctuation range at the kiln tail is reduced from ±20Pa to ±5Pa, lowering calcination energy consumption. The frequency of flap valve jamming is reduced by 95%, lowering labor costs and reducing equipment failure rates. It is suitable for environmentally friendly retrofitting in high-dust, high-temperature industrial environments. By installing a bucket elevator and a tubular screw conveyor on the existing ground, and constructing a waste buffer box on the second floor of the rotary kiln tail, connected to the tubular screw conveyor via a discharge pipe, the waste is lifted and transferred to the rotary kiln discharge pipe for reuse, forming a closed-loop waste transfer system. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the rotary kiln tail waste conveying device of this utility model;

[0017] Figure 2 This is a structural diagram of the enclosed conical hopper in the rotary kiln tail waste conveying device of this utility model;

[0018] Figure 3 This is a structural diagram of the chain bucket elevator in the rotary kiln tail waste conveying device of this utility model.

[0019] In the diagram, 1. Conical hopper, 11. Refractory castable layer, 12. Square grid screen, 13. Electric slide gate valve, 14. Observation hole, 2. Bucket elevator, 21. Reducer, 22. Drive motor, 3. Tubular screw conveyor, 4. Waste buffer box, 5. Raw material discharge pipe, 6. Elbow, 7. Base, 8. Fixing plate, 9. Bolt, 10. Shim. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Rotary kiln tail waste conveying device, refer to Figure 1 It includes a conical hopper 1, the inner wall of which is provided with a refractory castable layer 11, as shown in the reference. Figure 2 The conical hopper 1 is equipped with a square grid screen 12 inside, and each side of the square grid screen 12 is fixed on the refractory castable layer 11. The square grid screen 12 can prevent the upper castable from falling off and causing the lower equipment to jam and be damaged. The discharge port of the conical hopper 1 is equipped with an electric slide valve 13, and the discharge port of the conical hopper 1 is connected to the feed end of the bucket elevator 2. The discharge end of the bucket elevator 2 is connected to a tubular screw conveyor 3. The tubular screw conveyor 3 is connected to a raw material discharge pipe 5. The raw material discharge pipe 5 is connected to a waste buffer box 4.

[0022] The refractory castable layer 11 is composed of three parts: binder, aggregate, and admixture. The thickness of the refractory castable layer 11 is 100mm-110mm. The square grid screen 12 has a side length of 30mm-35mm. The top of the conical hopper 1 is provided with an observation hole 14, which has a side length of 350mm-400mm. The included angle between the conical hopper 1 and the bucket elevator 2 is not less than 60°. The discharge port of the conical hopper 1 is connected to the inlet of the bucket elevator 2 through a pipe.

[0023] Reference Figure 3 The bucket elevator 2 is a chain elevator. The verticality deviation of the bucket elevator 2 is no more than 0.3 / 1000mm. The chain material of the bucket elevator 2 is 310S stainless steel. The bucket elevator 2 is equipped with a drive motor 22. A reducer 21 is installed on one side of the drive motor 22. The casing of the bucket elevator 2 is fixed by flanges and studs. 3mm-5mm asbestos rope is wound on the studs. A grease layer is installed between the studs and the asbestos rope.

[0024] The tubular screw conveyor 3 is connected to the raw material discharge pipe 5 via an elbow 6. The included angle between the tubular screw conveyor 3 and the raw material discharge pipe 5 is 50°-65° and the horizontal deviation is no more than 3mm. The inner shaft of the tubular screw conveyor 3 is a seamless steel pipe of 65mm-80mm. The radius of curvature of the elbow 6 is no less than 1.5 times the diameter of the inner shaft pipe. The bottom of the bucket elevator 2 is equipped with a base 7. A fixing plate 8 is fixed on the base 7 by several bolts 9. Several shims 10 are placed on the fixing plate 8 and each shim 10 is close to the bolts 9. The bucket elevator 2 is placed on the shims 10.

[0025] The bucket elevator 2 is installed vertically to the ground and has a conveying capacity of not less than 3t / h; the leakage rate of the electric slide gate valve 13 does not exceed 0.1%, and the valve body flange is sealed with a graphite metal spiral wound gasket. The electric slide gate valve 13, the bucket elevator 2, the drive motor 22, and the tubular screw conveyor 3 are all electrically connected to a controller. The controller integrates PLC and HMI and can realize multi-parameter interlocking control of material level, temperature, and motor; the backstop torque of the check valve 25 is not less than 300N·m, and the tubular screw conveyor 3 is installed horizontally at the discharge end of the bucket elevator 2 with a center deviation of not more than 2mm.

[0026] Installation and use process of this utility model:

[0027] A C30 concrete base (1.5 meters long, 1.2 meters wide, and 0.3 meters high) is poured on the ground on one side of the rotary kiln tail. At the same time, a prefabricated fixing plate 8 is placed and fixed with several pre-embedded bolts 9. Shims 10 and bucket elevator 2 are placed, and the reference surface (upper flange surface) of bucket elevator 2 is leveled. The allowable tolerance for the parallelism between the reference surface and the horizontal plane is 1 / 1000mm. At the same time, shims 10 must be close to bolts 9.

[0028] Before installing the bucket elevator 2, separate the casing and connecting frame. When installing the casing and connecting frame, the flange perimeter must be neat and there should be no obvious misalignment. Insert 3mm-5mm thick asbestos rope between the connecting flange faces of the casing. Apply some grease to the asbestos rope to facilitate positioning and improve sealing. When inserting the asbestos rope, first thread studs between the casing flanges, then wrap one loop of asbestos rope around the flange connecting bolts. When installing the casing to heights of 4 meters, 8 meters, 12 meters, and 16 meters, it needs to be mounted on a nearby building. Install several supports, one every 8m-10m. The installation of the supports must not restrict the free extension and retraction of the bucket elevator 2 in the vertical direction. At the same time, while installing the casing, measure the verticality of the casing. After the upper section of the bucket elevator 2 is installed, the center line of the main shaft must be calibrated so that the center line of the main shaft is parallel and aligned with the center line of the lower shaft. The allowable tolerance for the parallelism between the center line of the upper shaft and the horizontal plane is 0.3 / 1000mm. The error of the verticality of the upper and lower shafts is less than 4mm, and the error of the verticality of the end faces of the upper and lower rollers is less than 5mm.

[0029] The drive motor 22 and the reducer 22 are an integrated drive unit. They are fixedly connected to the upper section of the transmission main shaft of the bucket elevator 2 via a coupling and are installed and positioned. After that, the motor power can be turned on. Since the bucket elevator 2 runs in one direction, the reducer 22 is equipped with a backstop.

[0030] Install a tubular screw conveyor 3 on one side of the raw material feed pipe 5 of the rotary kiln. Before installation, the docking position of the tubular screw conveyor 3 and the discharge end of the bucket elevator 2 needs to be corrected so that the discharge end of the bucket elevator 2 is perpendicular to the feed inlet of the tubular screw conveyor 3. Then, fix the tubular screw conveyor 3 horizontally to the fourth floor of the rotary kiln to maintain horizontal conveying. Connect the discharge port of the tubular screw conveyor 3 with an elbow 6 made according to the raw material feed pipe 5. To ensure smooth material flow, the included angle between the tubular screw conveyor 3 and the raw material feed pipe 5 is 5°. 0°-65°; A conical hopper 1 is made and installed below the discharge pipe of the rotary kiln. The inner wall of the conical hopper 1 is provided with a refractory castable layer 11 with a thickness of 100mm-110mm (temperature resistance not less than 1200℃). A square grid screen 12 is installed inside the conical hopper 1 to prevent the upper castable from falling off and causing the lower equipment to jam and be damaged. An electric slide gate valve 13 is configured at the discharge port (temperature resistance not less than 600℃, leakage rate not greater than 0.1%). The valve body flange is sealed with a graphite metal spiral wound gasket.

[0031] The waste material discharged from the kiln tail of the rotary kiln is transported to the conical hopper 1 through the discharge pipe. After the waste material is cooled and stationary, it is lifted to the fourth layer of the rotary kiln by the bucket elevator 2, and then transported to the inside of the discharge pipe by the tubular screw conveyor 3, thus realizing the closed-loop transfer of waste material.

[0032] Example 1:

[0033] The rotary kiln tail waste conveying device includes a conical hopper 1, the inner wall of which is provided with a refractory castable layer 11, a square grid screen 12 is provided inside the conical hopper 1 and each side of the square grid screen 12 is fixed on the refractory castable layer 11, an electric slide valve 13 is provided at the discharge port of the conical hopper 1 and the discharge port of the conical hopper 1 is connected to the inlet end of the bucket elevator 2, the discharge end of the bucket elevator 2 is connected to the tubular screw conveyor 3, the tubular screw conveyor 3 is connected to the raw material discharge pipe 5, and the raw material discharge pipe 5 is connected to the waste buffer box 4.

[0034] The refractory castable layer 11 is composed of three parts: binder, aggregate, and admixture, and the thickness of the refractory castable layer 11 is 100mm.

[0035] The square grid screen 12 has a side length of 30mm, and the top of the conical hopper 1 is provided with an observation hole 14, which has a side length of 350mm.

[0036] The casing of the bucket elevator 2 is fixed together by flanges and studs. A 3mm asbestos rope is wound around the studs, and a grease layer is placed between the studs and the asbestos rope.

[0037] The tubular screw conveyor 3 is connected to the raw material discharge pipe 5 via an elbow 6. The included angle between the tubular screw conveyor 3 and the raw material discharge pipe 5 is 50° and the horizontal deviation is no more than 3mm. The inner shaft of the tubular screw conveyor 3 is a 65mm seamless steel pipe, and the radius of curvature of the elbow 6 is no less than 1.5 times the inner shaft diameter.

[0038] Example 2:

[0039] The rotary kiln tail waste conveying device includes a conical hopper 1, the inner wall of which is provided with a refractory castable layer 11, a square grid screen 12 is provided inside the conical hopper 1 and each side of the square grid screen 12 is fixed on the refractory castable layer 11, an electric slide valve 13 is provided at the discharge port of the conical hopper 1 and the discharge port of the conical hopper 1 is connected to the inlet end of the bucket elevator 2, the discharge end of the bucket elevator 2 is connected to the tubular screw conveyor 3, the tubular screw conveyor 3 is connected to the raw material discharge pipe 5, and the raw material discharge pipe 5 is connected to the waste buffer box 4.

[0040] The square grid screen 12 has a side length of 33mm, and the top of the conical hopper 1 has an observation hole 14 with a side length of 380mm.

[0041] A speed reducer 21 is installed on one side of the drive motor 22 on the bucket elevator 2.

[0042] The casing of the bucket elevator 2 is fixed together by flanges and studs. A 4mm asbestos rope is wound around the studs, and a grease layer is placed between the studs and the asbestos rope.

[0043] The tubular screw conveyor 3 is connected to the raw material discharge pipe 5 via an elbow 6. The included angle between the tubular screw conveyor 3 and the raw material discharge pipe 5 is 58° and the horizontal deviation is no more than 3mm. The inner shaft of the tubular screw conveyor 3 is a 70mm seamless steel pipe, and the radius of curvature of the elbow 6 is no less than 1.5 times the inner shaft diameter.

[0044] The bottom of the bucket elevator 2 is provided with a base 7. A fixing plate 8 is fixed on the base 7 by several bolts 9. Several shims 10 are placed on the fixing plate 8, and each shim 10 is close to the bolts 9. The bucket elevator 2 is placed on the shims 10.

[0045] Example 3:

[0046] The rotary kiln tail waste conveying device includes a conical hopper 1, the inner wall of which is provided with a refractory castable layer 11, a square grid screen 12 is provided inside the conical hopper 1 and each side of the square grid screen 12 is fixed on the refractory castable layer 11, an electric slide valve 13 is provided at the discharge port of the conical hopper 1 and the discharge port of the conical hopper 1 is connected to the inlet end of the bucket elevator 2, the discharge end of the bucket elevator 2 is connected to the tubular screw conveyor 3, the tubular screw conveyor 3 is connected to the raw material discharge pipe 5, and the raw material discharge pipe 5 is connected to the waste buffer box 4.

[0047] The refractory castable layer 11 is composed of three parts: binder, aggregate, and admixture, and the thickness of the refractory castable layer 11 is 105 mm.

[0048] The included angle between the conical hopper 1 and the bucket elevator 2 is not less than 60°, and the discharge port of the conical hopper 1 is connected to the feed end of the bucket elevator 2 through a pipe.

[0049] The tubular screw conveyor 3 is connected to the raw material discharge pipe 5 via an elbow 6. The included angle between the tubular screw conveyor 3 and the raw material discharge pipe 5 is 65° and the horizontal deviation is no more than 3mm. The inner shaft of the tubular screw conveyor 3 is an 80mm seamless steel pipe, and the radius of curvature of the elbow 6 is no less than 1.5 times the inner shaft diameter.

[0050] Example 4:

[0051] The rotary kiln tail waste conveying device includes a conical hopper 1, the inner wall of which is provided with a refractory castable layer 11, a square grid screen 12 is provided inside the conical hopper 1 and each side of the square grid screen 12 is fixed on the refractory castable layer 11, an electric slide valve 13 is provided at the discharge port of the conical hopper 1 and the discharge port of the conical hopper 1 is connected to the inlet end of the bucket elevator 2, the discharge end of the bucket elevator 2 is connected to the tubular screw conveyor 3, the tubular screw conveyor 3 is connected to the raw material discharge pipe 5, and the raw material discharge pipe 5 is connected to the waste buffer box 4.

[0052] The square grid screen 12 has a side length of 35mm, and the top of the conical hopper 1 has an observation hole 14 with a side length of 400mm.

[0053] The included angle between the conical hopper 1 and the bucket elevator 2 is not less than 60°, and the discharge port of the conical hopper 1 is connected to the feed end of the bucket elevator 2 through a pipe.

[0054] Bucket elevator 2 is a chain elevator. The verticality deviation of bucket elevator 2 is no more than 0.3 / 1000mm. The chain material of bucket elevator 2 is 310S stainless steel. Bucket elevator 2 is equipped with a drive motor 22.

[0055] The tubular screw conveyor 3 is connected to the raw material discharge pipe 5 via an elbow 6. The included angle between the tubular screw conveyor 3 and the raw material discharge pipe 5 is 55° and the horizontal deviation is no more than 3mm. The inner shaft of the tubular screw conveyor 3 is a 70mm seamless steel pipe, and the radius of curvature of the elbow 6 is no less than 1.5 times the inner shaft diameter.

[0056] The bottom of the bucket elevator 2 is provided with a base 7. A fixing plate 8 is fixed on the base 7 by several bolts 9. Several shims 10 are placed on the fixing plate 8, and each shim 10 is close to the bolts 9. The bucket elevator 2 is placed on the shims 10.

[0057] Example 5:

[0058] The rotary kiln tail waste conveying device includes a conical hopper 1, the inner wall of which is provided with a refractory castable layer 11, a square grid screen 12 is provided inside the conical hopper 1 and each side of the square grid screen 12 is fixed on the refractory castable layer 11, an electric slide valve 13 is provided at the discharge port of the conical hopper 1 and the discharge port of the conical hopper 1 is connected to the inlet end of the bucket elevator 2, the discharge end of the bucket elevator 2 is connected to the tubular screw conveyor 3, the tubular screw conveyor 3 is connected to the raw material discharge pipe 5, and the raw material discharge pipe 5 is connected to the waste buffer box 4.

[0059] The refractory castable layer 11 is composed of three parts: binder, aggregate, and admixture, and the thickness of the refractory castable layer 11 is 110 mm.

[0060] A speed reducer 21 is installed on one side of the drive motor 22 on the bucket elevator 2.

[0061] The casing of the bucket elevator 2 is fixed together by flanges and studs. A 5mm asbestos rope is wound around the studs, and a grease layer is placed between the studs and the asbestos rope.

[0062] The tubular screw conveyor 3 is connected to the raw material discharge pipe 5 via an elbow 6. The included angle between the tubular screw conveyor 3 and the raw material discharge pipe 5 is 65° and the horizontal deviation is no more than 3mm. The inner shaft of the tubular screw conveyor 3 is an 80mm seamless steel pipe, and the radius of curvature of the elbow 6 is no less than 1.5 times the inner shaft diameter.

[0063] The bottom of the bucket elevator 2 is provided with a base 7. A fixing plate 8 is fixed on the base 7 by several bolts 9. Several shims 10 are placed on the fixing plate 8, and each shim 10 is close to the bolts 9. The bucket elevator 2 is placed on the shims 10.

[0064] Example 6:

[0065] The rotary kiln tail waste conveying device includes a conical hopper 1, the inner wall of which is provided with a refractory castable layer 11, a square grid screen 12 is provided inside the conical hopper 1 and each side of the square grid screen 12 is fixed on the refractory castable layer 11, an electric slide valve 13 is provided at the discharge port of the conical hopper 1 and the discharge port of the conical hopper 1 is connected to the inlet end of the bucket elevator 2, the discharge end of the bucket elevator 2 is connected to the tubular screw conveyor 3, the tubular screw conveyor 3 is connected to the raw material discharge pipe 5, and the raw material discharge pipe 5 is connected to the waste buffer box 4.

[0066] The included angle between the conical hopper 1 and the bucket elevator 2 is not less than 60°, and the discharge port of the conical hopper 1 is connected to the feed end of the bucket elevator 2 through a pipe.

[0067] Bucket elevator 2 is a chain elevator. The verticality deviation of bucket elevator 2 is no more than 0.3 / 1000mm. The chain material of bucket elevator 2 is 310S stainless steel. Bucket elevator 2 is equipped with a drive motor 22.

[0068] A speed reducer 21 is installed on one side of the drive motor 22 on the bucket elevator 2.

[0069] The casing of the bucket elevator 2 is fixed together by flanges and studs. A 5mm asbestos rope is wound around the studs, and a grease layer is placed between the studs and the asbestos rope.

Claims

1. A rotary kiln tailings conveyor, characterised in that, The device includes a conical hopper (1), the inner wall of which is provided with a refractory castable layer (11), a square grid screen (12) is provided inside the conical hopper (1) and each side of the square grid screen (12) is fixed on the refractory castable layer (11), an electric slide valve (13) is provided at the discharge port of the conical hopper (1) and the discharge port of the conical hopper (1) is connected to the feed end of a bucket elevator (2), the discharge end of the bucket elevator (2) is connected to a tubular screw conveyor (3), the tubular screw conveyor (3) is connected to a raw material discharge pipe (5), and the raw material discharge pipe (5) is connected to a waste buffer box (4).

2. A rotary kiln tailings transport apparatus according to claim 1, characterised in that, The square grid screen (12) has a side length of 30mm-35mm, and the top of the conical hopper (1) is provided with an observation hole (14) with a side length of 350mm-400mm.

3. The rotary kiln tail end waste conveying apparatus as claimed in claim 1, wherein, The included angle between the conical hopper (1) and the bucket elevator (2) is not less than 60°, and the discharge port of the conical hopper (1) is connected to the feed end of the bucket elevator (2) through a pipe.

4. The rotary kiln tail end waste conveying apparatus as claimed in claim 1, wherein, The bucket elevator (2) is a chain elevator. The verticality deviation of the bucket elevator (2) is no more than 0.3 / 1000mm. The chain material of the bucket elevator (2) is 310S stainless steel. The bucket elevator (2) is equipped with a drive motor (22).

5. The rotary kiln tail end waste conveying apparatus as claimed in claim 1, wherein, A speed reducer (21) is provided on one side of the drive motor (22) of the bucket elevator (2).

6. A kiln tail waste conveyor according to any one of claims 1 to 5, wherein, The bucket elevator (2) is fixed between the casings by flanges and studs. A 3mm-5mm asbestos rope is wound around the studs, and a grease layer is provided between the studs and the asbestos rope.

7. A kiln tail waste conveyor according to any one of claims 1 to 5, wherein, The tubular screw conveyor (3) is connected to the raw material discharge pipe (5) through an elbow (6). The included angle between the tubular screw conveyor (3) and the raw material discharge pipe (5) is 50°-65° and the horizontal deviation is no more than 3mm. The inner shaft of the tubular screw conveyor (3) is a seamless steel pipe of 65mm-80mm. The radius of curvature of the elbow (6) is no less than 1.5 times the inner shaft diameter.

8. A kiln tail waste conveyor according to any one of claims 1 to 5, wherein, The bucket elevator (2) has a base (7) at its bottom. A fixing plate (8) is fixed on the base (7) by several bolts (9). Several pads (10) are placed on the fixing plate (8) and each pad (10) is close to the bolts (9). The bucket elevator (2) is placed on the pads (10).

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