Feeding structure and scraping device of magnetic material rotary kiln

Abstract

The invention relates to the technical field of rotary kilns, and particularly discloses a magnetic material rotary kiln feeding structure and a scraping device.The magnetic material rotary kiln feeding structure comprises a rotary kiln, a kiln tail box is arranged at the tail end of a rotary kiln cylinder, a spiral conveyor is inserted into the hollow part of the kiln tail box, and a feeding port of the spiral conveyor is connected with a slag outlet of a centrifugal dehydrator; a feeding pipe of the centrifugal dehydrator is connected with an outlet of the conveying pump, and a feeding pipe of the conveying pump is connected with a discharging pipe at the bottom of the storage stirring tank. The scraping device is arranged at the tail end in the rotary kiln cylinder and composed of the fixing rod, the reinforcing rod, the scraping plate and other components, when the rotary kiln works, the cylinder can drive the scraping device to rotate, when the scraping plate in the scraping device is located under the discharging port, the gap between the scraping plate and the discharging port is only 2 cm, and the scraping plate is not prone to falling off. The scraping plate can push away materials accumulated at the discharging port, the materials are prevented from being accumulated at the discharging port, the discharging port is prevented from being blocked, and waste gas can be normally discharged.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary kilns, and in particular relates to a magnetic material rotary kiln feeding structure and a scraping device. Background Art

[0002] Materials that can respond to magnetic fields in some way are called magnetic materials. According to the strength of the magnetism exhibited by the material in the external magnetic field, it can be divided into diamagnetic materials, paramagnetic materials, ferromagnetic materials, antiferromagnetic materials and ferrimagnetic materials. Most materials are diamagnetic or paramagnetic, and they react weakly to the external magnetic field. Ferromagnetic materials and ferrimagnetic materials are strong magnetic materials, and the magnetic materials usually referred to are strong magnetic materials.

[0003] As a commonly used industrial equipment, the rotary kiln is widely used in heat treatment processes such as drying, roasting, and high-temperature calcination. The rotary kiln is a cylindrical structure. The material enters the baffle plate of the cylinder through the feed pipe. The rotary kiln rotates the material in the cylinder to make it rotate and turn over continuously, fully contact with the high-temperature gas in the cylinder, and move from the low-temperature section to the high-temperature section, thereby realizing the heat treatment process of drying, roasting, and high-temperature calcination of the material. The waste gas generated after the heat exchange between the high-temperature gas and the material is discharged through the gap between the feed pipe and the baffle plate. The rotary kiln can process various materials. According to the state of the processed materials, it can be divided into wet and dry rotary kilns;

[0004] In the prior art, when the wet process rotary kiln is fed through the feed pipe, the following problems are likely to occur:

[0005] When wet materials enter the cylinder, they tend to get stuck on the cylinder wall. As the cylinder rotates and rises to a high point, the materials will fall onto the feed pipe, which causes the wet materials to accumulate in the feed pipe. The accumulated feed pipe is difficult to clean, which directly affects the smoothness of exhaust gas discharge. Therefore, the present application proposes a magnetic material rotary kiln feeding structure and scraping device. Summary of the invention

[0006] The object of the present invention is to provide a magnetic material rotary kiln feeding structure and a scraping device to solve the problems raised by the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a magnetic material rotary kiln feeding structure, comprising a rotary kiln, a kiln tail box is arranged at the tail end of the rotary kiln cylinder, a screw conveyor is inserted into the hollow part of the kiln tail box, the feed port of the screw conveyor is connected to the slag outlet of the centrifugal dehydrator, the feed pipe of the centrifugal dehydrator is connected to the outlet of the delivery pump, and the feeding pipe of the delivery pump is connected to the discharge pipe at the bottom of the storage mixing tank;

[0008] The screw conveyor is placed on the kiln tail platform through a movable bracket, and a scraping device is arranged at the tail end of the screw conveyor extending into the rotary kiln cylinder.

[0009] Preferably, the feed port of the screw conveyor is located directly below the centrifugal dehydrator.

[0010] Preferably, the storage mixing tank includes a tank body, the bottom of the tank body is provided with supporting legs, the supporting legs are fixed to the tank body by welding, and a stirring shaft is inserted into the middle position inside the tank body, and the stirring shaft is connected to the lower support seat at the inner bottom of the tank body through a bearing.

[0011] Preferably, a plurality of stirring plates are mounted on the stirring shaft, the stirring plates are detachably connected to the stirring shaft, the stirring shaft penetrates the tank cover, and the stirring shaft is connected to a stirring motor on the upper side of the tank cover, and the stirring motor is mounted on the tank cover via a motor bracket.

[0012] Preferably, the tank cover is snap-fittedly connected to the tank body, a feed port is provided inside the tank body, and a discharge pipe is inserted into the bottom of the tank body, the discharge pipe is connected to a delivery pump, and the other side of the delivery pump is connected to a feed pipe of a centrifugal dehydrator through a pipeline.

[0013] Preferably, the screw conveyor comprises a shell, a conveying shaft is inserted into the shell, spirally distributed conveying blades are welded on the conveying shaft, and the conveying shaft is connected to a power unit for driving the conveying shaft to rotate.

[0014] Preferably, a pulley is installed at the bottom of the movable bracket, the pulley has a braking function, and the length of the screw conveyor is longer than the length of the kiln tail platform.

[0015] Preferably, the scraper device includes a scraper, the direction of the scraper is parallel to the direction of the screw conveyor, the scraper is fixedly mounted on a fixed rod perpendicular to the rotary kiln cylinder, and two first triangular plates are provided at the position where the fixed rod is connected to the baffle plate, one right-angled side of the first triangular plate fits the outer surface of the fixed rod, and the other right-angled side of the first triangular plate fits the side wall of the baffle plate in the rotary kiln.

[0016] Preferably, the first triangular plate is fixed to the fixing rod by welding, a reinforcement rod is installed on the fixing rod, the reinforcement rod is vertically distributed to the fixing rod, the other end of the reinforcement rod is against the material baffle plate, two second triangular plates are arranged at the position where the reinforcement rod is connected to the material baffle plate, and the second triangular plates are fixed to the reinforcement rod by welding.

[0017] Preferably, the length of the scraper is longer than the length of the discharge port in the screw conveyor, and the scraper extends 5 cm from the tail end of the screw conveyor. When the scraper is directly below the discharge port of the screw conveyor, the gap between the upper end surface of the scraper and the lower end surface of the discharge port is 2 cm.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, the material first enters into a storage mixing tank, and after being uniformly stirred by a stirring shaft and other components in the storage mixing tank, the material is transported to a centrifugal dehydrator via a conveying pump. The centrifugal dehydrator drives the material to move, during which the water mixed in the material is removed. After that, the material is discharged from the slag outlet of the centrifugal dehydrator into a screw conveyor, and the screw conveyor, driven by its conveying blades and other components, delivers the material into a rotary kiln for processing. During the entire conveying process, the material is first dehydrated by the centrifugal dehydrator, and the water mixed in the material is greatly reduced. The material is not easy to stick to the inner wall of the cylinder in the rotary kiln. When the material enters the cylinder in the rotary kiln, the screw conveyor provides power to push the material into the cylinder, thereby accelerating the speed at which the material enters the cylinder. At the same time, the thrust makes it difficult for the discharge port to be blocked.

[0020] 2. The present invention provides a scraper device at the tail end of the rotary kiln cylinder, which is composed of a fixed rod, a reinforcement rod, a scraper and other components. When the rotary kiln is working, the cylinder will drive the scraper device to rotate. When the scraper in the scraper device is directly below the discharge port, the gap between the scraper and the discharge port is only 2 cm. The scraper can push away the material accumulated at the discharge port to avoid the accumulation of material at the discharge port, avoid the blockage of the discharge port, and allow the exhaust gas to be discharged normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the feeding structure and scraping device of the magnetic material rotary kiln in the present invention.

[0022] Figure 2 This is one of the structural schematic diagrams of the scraping device in the present invention.

[0023] Figure 3 It is a structural schematic diagram of the material storage stirring tank in the present invention.

[0024] Figure 4 This is the second structural schematic diagram of the scraping device in the present invention.

[0025] In the figure: 1, rotary kiln; 101, material baffle; 2, kiln tail box; 3, centrifugal dehydrator; 4, storage mixing tank; 5, conveying pump; 6, kiln tail platform; 7, screw conveyor; 701, material discharge port; 8, scraper device; 801, fixing rod; 802, first triangular plate; 803, reinforcement rod; 804, scraper. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Reference Figure 1-Figure 4 , a magnetic material rotary kiln feeding structure and scraping device, including a rotary kiln 1. As a commonly used industrial equipment, the rotary kiln is widely used in heat treatment processes such as drying, roasting, and high-temperature calcination. The rotary kiln is a cylindrical structure. The material enters the inside of the baffle plate of the cylinder through the feed pipe. The rotary kiln rotates the material in the cylinder to make it rotate and turn over continuously, fully contact with the high-temperature gas in the cylinder, and move from the low-temperature section to the high-temperature section, thereby realizing the heat treatment process of drying, roasting, and high-temperature calcination of the material. The waste gas generated after the high-temperature gas exchanges heat with the material is discharged through the gap between the feed pipe and the baffle plate. The rotary kiln can process various materials. According to the different states of the processed materials, it can be divided into wet and dry rotary kilns;

[0028] A kiln tail box 2 is provided at the tail end of the rotary kiln 1 cylinder, and a screw conveyor 7 is inserted into the hollow part of the kiln tail box 2. The feed port of the screw conveyor 7 is connected with the slag outlet of the centrifugal dehydrator 3. Specifically, the feed port of the screw conveyor 7 is located directly below the centrifugal dehydrator 3, the feed pipe of the centrifugal dehydrator 3 is connected with the outlet of the conveying pump 5, and the feeding pipe of the conveying pump 5 is connected with the discharge pipe at the bottom of the storage mixing tank 4; the screw conveyor 7 is placed on the kiln tail platform 6 through a movable bracket, and a scraper device 8 is provided at the tail end of the screw conveyor 7 extending into the cylinder of the rotary kiln 1.

[0029] Specifically, the storage stirring tank 4 includes a tank body, a support leg is provided at the bottom of the tank body, the support leg is fixed to the tank body by welding, and a stirring shaft is inserted at the middle position inside the tank body, the stirring shaft is connected to the lower support seat at the bottom of the inner side of the tank body through a bearing, and a plurality of stirring plates are installed on the stirring shaft, the stirring plates are detachably connected to the stirring shaft, the stirring shaft penetrates the tank cover, and the stirring shaft is connected to the stirring motor on the upper side of the tank cover, the stirring motor is installed on the tank cover through a motor bracket, the tank cover and the tank body are snap-fitted, a feed port is provided on the inner side of the tank body, and a discharge pipe is inserted at the bottom of the tank body, the discharge pipe is connected to the delivery pump 5, and the other side of the delivery pump 5 is connected to the feed pipe of the centrifugal dehydrator 3 through a pipeline.

[0030] Please refer to Figure 1 After the raw materials enter the storage mixing tank 4, they are stirred by the stirring shaft and stirring plate inside the tank body. After the raw materials are mixed, they are finally discharged from the discharge pipe at the bottom of the tank body and sent to the inside of the centrifugal dehydrator 3 through the delivery pump 5.

[0031] Centrifugal dehydrator 3 is a device that uses centrifugal force to separate water or liquid from materials. The working process of centrifugal dehydrator 3 includes the following stages:

[0032] Starting stage: The motor drives the drum to rotate around the main shaft axis through the transmission system, forming a high-speed rotation state.

[0033] Dehydration stage: After the suspension enters the drum from the feed pipe, it is immediately thrown into the drum cavity under the centrifugal force generated by high-speed rotation. The high-speed rotating drum generates a strong centrifugal force to separate the water in the material from the solid particles.

[0034] Collection stage: The dehydrated material is discharged through the discharge port at the bottom of the drum, while the liquid is thrown out through the filter screen or pores on the drum wall and discharged out of the machine along the drum wall. The centrifugal dehydrator 3 removes part of the water mixed in the material, and finally the material enters the screw conveyor 7 through the slag outlet of the centrifugal dehydrator 3.

[0035] Specifically, the screw conveyor 7 includes a housing, a conveying shaft is inserted into the housing, spirally distributed conveying blades are welded on the conveying shaft, and the conveying shaft is connected to a power unit for driving the conveying shaft to rotate. The screw conveyor 7 can push the material discharged from the slag outlet of the centrifugal dehydrator 3 into the cylinder of the rotary kiln 1.

[0036] The screw conveyor 7 is placed on the kiln tail platform 6 through a movable bracket, and a pulley is installed at the bottom of the movable bracket. The pulley has a braking function. The length of the screw conveyor 7 is longer than the length of the kiln tail platform 6. A guide hole is provided at the position of the shell of the screw conveyor 7 in the kiln tail box 2 corresponding to the position of the shell of the screw conveyor 7. The guide hole and the shell of the screw conveyor 7 can slide relative to each other, and the area where the two are slidably connected is located on the outside of the shell of the screw conveyor 7 and is wrapped with a sealing sleeve.

[0037] Please refer to Figure 2 The scraper device 8 includes a scraper 804, the direction of the scraper 804 is parallel to the direction of the screw conveyor 7, the scraper 804 is made of high temperature resistant round steel, the scraper 804 is fixedly installed on a fixed rod 801 perpendicular to the cylinder of the rotary kiln 1, two first triangular plates 802 are arranged at the position where the fixed rod 801 is connected to the baffle plate 101, one right-angled side of the first triangular plate 802 fits the outer surface of the fixed rod 801, and the other right-angled side of the first triangular plate 802 fits the side wall of the baffle plate 101 in the rotary kiln 1, the first triangular plate 802 is fixed to the fixed rod 801 by welding, a reinforcing rod 803 is installed on the fixed rod 801, the reinforcing rod 803 is vertically distributed with the fixed rod 801, the other end of the reinforcing rod 803 is against the baffle plate 101, two second triangular plates are arranged at the position where the reinforcing rod 803 is connected to the baffle plate 101, and the second triangular plates are fixed to the reinforcing rod 803 by welding.

[0038] When the rotary kiln 1 rotates, the scraper 804 rotates around the center line of the screw conveyor 7. The power during the rotation comes from the rotary kiln 1. When the scraper 804 moves to the bottom of the discharge port 701 of the screw conveyor 7, a gap is designed between the top of the scraper 804 and the bottom of the discharge port 701.

[0039] The scraper 804 extends out from the rear end of the screw conveyor 7 so that the scraped materials do not accumulate at the rear end of the screw conveyor 7, i.e., the discharge port 701. Therefore, the length of the scraper 804 is longer than the length of the discharge port 701 in the screw conveyor 7.

[0040] In a further embodiment, the scraper 804 extends 5 cm from the tail end of the screw conveyor 7. When the scraper 804 is directly below the discharge port 701 of the screw conveyor 7, the gap between the upper end surface of the scraper 804 and the lower end surface of the discharge port 701 is 2 cm. When the rotary kiln 1 cylinder rotates, the scraper 804 rotates around the center line of the screw conveyor 7. The power during the rotation process comes from the rotary kiln 1, and the materials accumulated at the discharge port 701 in the screw conveyor 7 can be scraped off. The materials fall directly into the bottom of the cylinder after being scraped off. There is a 2 cm gap between the top of the scraper 804 and the bottom of the discharge port 701. At this distance, the scraper 804 will not interfere with the discharge port 701 of the screw conveyor 7 during its rotation, and can promote the movement of the materials accumulated at the discharge port 701 to the greatest extent, avoiding the materials from blocking the discharge port 701.

[0041] Working principle:

[0042] The material first enters the storage mixing tank 4, and after being evenly mixed by the mixing shaft and other components in the storage mixing tank 4, it is transported to the centrifugal dehydrator 3 through the delivery pump 5. The centrifugal dehydrator 3 drives the material to move, during which the water mixed in the material is removed. After that, the material is discharged from the slag outlet of the centrifugal dehydrator 3 into the screw conveyor 7, and the screw conveyor 7, driven by the conveying blades and other components therein, delivers the material into the rotary kiln 1 for processing.

[0043] During the whole conveying process, the material is first dehydrated by the centrifugal dehydrator 3, and the water content in the material is greatly reduced. The material is not easy to stick to the inner wall of the cylinder in the rotary kiln 1. When the material enters the cylinder in the rotary kiln 1, the screw conveyor 7 provides power to push the material into the cylinder, speeding up the speed of the material entering the cylinder. At the same time, the above thrust makes it difficult for the discharge port 701 to be blocked.

[0044] A scraper device 8 is provided at the tail end of the cylinder of the rotary kiln 1. The scraper device 8 is composed of a fixing rod 801, a reinforcing rod 803, a scraper 804 and other components. When the rotary kiln 1 is working, the cylinder will drive the scraper device 8 to rotate. When the scraper 804 in the scraper device 8 is directly below the discharge port 701, the gap between the scraper 804 and the discharge port 701 is only 2 cm. The scraper 804 can push away the materials accumulated at the discharge port 701 to avoid the accumulation of materials at the discharge port 701 and the blockage of the discharge port 701, so that the exhaust gas can be discharged normally.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic material rotary kiln feeding structure, comprising a rotary kiln (1), characterized in that: The rotary kiln (1) is provided with a kiln tail box (2) at the rear end of the cylinder, a screw conveyor (7) is inserted into the hollow part of the kiln tail box (2), the feed port of the screw conveyor (7) is connected to the slag outlet of the centrifugal dehydrator (3), the feed pipe of the centrifugal dehydrator (3) is connected to the outlet of the delivery pump (5), and the feed pipe of the delivery pump (5) is connected to the discharge pipe at the bottom of the storage mixing tank (4); The screw conveyor (7) is placed on the kiln tail platform (6) via a movable bracket, and a scraping device (8) is provided at the tail end of the screw conveyor (7) extending into the cylinder of the rotary kiln (1).

2. A magnetic material rotary kiln feeding structure according to claim 1, characterized in that: The feed port of the screw conveyor (7) is located directly below the centrifugal dehydrator (3).

3. A magnetic material rotary kiln feeding structure according to claim 1, characterized in that: The material storage stirring tank (4) comprises a tank body, the bottom of which is provided with supporting legs, the supporting legs are fixed to the tank body by welding, and a stirring shaft is inserted into the middle position of the tank body, and the stirring shaft is connected to a lower support seat at the bottom of the inner side of the tank body through a bearing.

4. A magnetic material rotary kiln feeding structure according to claim 3, characterized in that: A plurality of stirring plates are installed on the stirring shaft, the stirring plates are detachably connected to the stirring shaft, the stirring shaft penetrates the tank cover, and the stirring shaft is connected to a stirring motor on the upper side of the tank cover, and the stirring motor is installed on the tank cover through a motor bracket.

5. A magnetic material rotary kiln feeding structure according to claim 4, characterized in that: The tank cover is snap-fittedly connected to the tank body, a feed port is provided inside the tank body, a discharge pipe is inserted into the bottom of the tank body, the discharge pipe is connected to a delivery pump (5), and the other side of the delivery pump (5) is connected to a feed pipe of a centrifugal dehydrator (3) via a pipeline.

6. The magnetic material rotary kiln feeding structure according to claim 1, characterized in that: The screw conveyor (7) comprises a shell, a conveying shaft is inserted into the shell, spirally distributed conveying blades are welded on the conveying shaft, and the conveying shaft is connected to a power unit for driving the conveying shaft to rotate.

7. The magnetic material rotary kiln feeding structure according to claim 1, characterized in that: A pulley is installed at the bottom of the movable bracket, and the pulley has a braking function. The length of the screw conveyor (7) is longer than the length of the kiln tail platform (6).

8. The magnetic material rotary kiln feeding structure according to claim 1, characterized in that: The scraper device (8) comprises a scraper (804), the direction of the scraper (804) is parallel to the direction of the screw conveyor (7), and the scraper (804) is fixedly mounted on a fixed rod (801) perpendicular to the cylinder of the rotary kiln (1), and two first triangular plates (802) are arranged at the position where the fixed rod (801) is connected to the baffle plate (101), one right-angled side of the first triangular plate (802) is in contact with the outer surface of the fixed rod (801), and the other right-angled side of the first triangular plate (802) is in contact with the side wall of the baffle plate (101) in the rotary kiln (1).

9. A magnetic material rotary kiln feeding structure according to claim 8, characterized in that: The first triangular plate (802) is fixed to the fixing rod (801) by welding, and a reinforcing rod (803) is installed on the fixing rod (801), and the reinforcing rod (803) is vertically distributed with the fixing rod (801), and the other end of the reinforcing rod (803) is against the material blocking plate (101), and two second triangular plates are arranged at the position where the reinforcing rod (803) and the material blocking plate (101) are connected, and the second triangular plates are fixed to the reinforcing rod (803) by welding.

10. A magnetic material rotary kiln feeding structure according to claim 9, characterized in that: The length of the scraper (804) is longer than the length of the discharge port (701) in the screw conveyor (7). The scraper (804) extends 5 cm beyond the rear end of the screw conveyor (7). When the scraper (804) is located directly below the discharge port (701) of the screw conveyor (7), the gap between the upper end surface of the scraper (804) and the lower end surface of the discharge port (701) is 2 cm.

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