Stable feeding device of rotary kiln

Abstract

The utility model relates to the technical field of rotary kiln feeding, and particularly discloses a rotary kiln stable feeding device which comprises a large bag-type dust collector and two conical collecting hoppers arranged on the lower portion of the bottom end of the large bag-type dust collector. The discharging port ends of the two first star-shaped dischargers are detachably connected with a spiral conveyor, the discharging port end of the spiral conveyor is communicated with a conical buffer storage bin capable of weighing, the discharging port end of the conical buffer storage bin is provided with a second star-shaped discharger, and a discharging port of the second star-shaped discharger is communicated with a feeding port of the rotary kiln. The first star-shaped discharger and the second star-shaped discharger are matched with the conical buffer storage bin capable of weighing, it is guaranteed that materials in the conical buffer storage bin are always kept fluctuating in a specified interval, the materials can be always, evenly and stably fed into the rotary kiln, then product indexes are stabilized, generation of unqualified products is reduced, and the production efficiency is improved. The product percent of pass is improved, the cost is reduced and the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kiln feeding, and particularly relates to a stable feeding device for a rotary kiln. Background Art

[0002] For the existing rotary kiln with an annual output of 40,000 tons of iron phosphate, the feeding system of this rotary kiln is a dust collection large bag filter. There are two conical collecting hoppers provided at the lower part of the bottom end of the dust collection large bag filter. Both conical collecting hoppers are controlled for feeding through star-shaped feeders. A section of V-shaped pipe is commonly connected below the two star-shaped feeders, and the V-shaped pipe is connected to the rotary kiln feed inlet.

[0003] As the feeding progresses, the dust on the surface of the cloth bag gradually accumulates, forming a dust layer. This dust layer will gradually thicken, resulting in an increase in filtration resistance and a decrease in the treated air volume. In order to maintain the normal operation of the dust collector, it is necessary to perform ash cleaning operations regularly. The ash cleaning process is realized through a pulse valve controlled by a program. The pulse valve is usually installed above the filter bag and is precisely controlled to open and close through a control system (such as a PLC). When the control system detects that the pressure difference between the inlet and outlet of the dust collector exceeds a preset value, it indicates that the dust particles on the filter bag have accumulated to a certain extent and ash cleaning is required. At this time, the control system will start the pulse valve and inject high-pressure compressed air into the filter bag. The high-pressure air flow instantly impacts the filter bag, causing the filter bag to vibrate and expand, thereby shaking off the dust layer on the surface of the cloth bag.

[0004] Since the dust collection large bag filter controls compressed air through a pulse valve controlled by a program to achieve the purpose of ash cleaning, which has a certain periodicity, the dust collection large bag filter sometimes has a large feeding amount and sometimes a small feeding amount, resulting in uneven feeding controlled by the pulse valve. Coupled with the lack of effective means for monitoring the material level or weight on the dust collection large bag filter, it is necessary to adjust the rotation speed of the star-shaped feeder to control the feeding amount of the rotary kiln. If the rotation speed of the star-shaped feeder is adjusted too fast, it will cause the feeding of the rotary kiln and the feeding of the dust collector to be unevenly synchronized, resulting in inconsistent material layer thickness in the rotary kiln, thereby causing fluctuations in the moisture content of the product, and even the moisture content of the product may be unqualified; if the rotation speed of the star-shaped feeder is adjusted too slowly, it will cause the material in the bag filter to accumulate more and more, resulting in a plugging accident, and it is very difficult to achieve the control of stable feeding of the rotary kiln. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a stable feeding device for a rotary kiln to solve the problem that it is very difficult to stably feed the existing device into the rotary kiln.

[0006] To solve the above problems, the following technical solutions are provided:

[0007] A rotary kiln stable feeding device, comprising a large bag filter and two conical collecting hoppers arranged at the lower part of the bottom end of the large bag filter. The bottom ends of the two conical collecting hoppers are fixedly connected with first star-shaped feeders. The discharge port ends of the two first star-shaped feeders are detachably connected with a screw conveyor. The discharge port end of the screw conveyor is communicated with a weighable conical buffer bin. The discharge port end of the conical buffer bin is provided with a second star-shaped feeder, and the discharge port of the second star-shaped feeder is communicated with the feed inlet of the rotary kiln.

[0008] The basic principle of the above technical solution is as follows: The phosphoric acid iron powder material cleaned by pulse cleaning of the large bag filter through program control falls into the conical collecting hopper. The phosphoric acid iron powder material in the conical collecting hopper is fed into the screw conveyor through the first star-shaped feeder. The screw conveyor then transports the phosphoric acid iron powder material to the conical buffer bin. The conical buffer bin can weigh the material. When the material in the conical buffer bin reaches the specified weight, the second star-shaped feeder is started for feeding, and the feeding frequency of the second star-shaped feeder is adjusted to ensure that the material in the conical buffer bin is neither emptied nor overfilled, but always fluctuates within a certain range, so as to achieve uniform feeding of the rotary kiln.

[0009] The beneficial effect of the above technical solution is as follows: Compared with the existing method of directly feeding into the rotary kiln through a single star-shaped feeder, this technical solution cooperates with two feeders, namely the first star-shaped feeder and the second star-shaped feeder, and a weighable conical buffer bin, ensuring that the material in the conical buffer bin always fluctuates within the specified range, can always feed into the rotary kiln evenly and stably, thereby stabilizing the product index, reducing the generation of unqualified products, improving the product qualification rate, reducing costs, and improving economic benefits.

[0010] Further, a pressure sensor is provided at the bottom end of the conical buffer bin, and a plurality of vibrators are provided on the outer periphery of the conical buffer bin. The plurality of vibrators are evenly distributed on the outer periphery of the conical buffer bin. The pressure signal in the conical buffer bin is sensed by the pressure sensor to weigh the weight of the material buffered in the conical buffer bin. The controller controls the plurality of vibrators to knock on the outer wall of the conical buffer bin at a uniform speed to prevent the material from bridging in the conical buffer bin and being unable to fall.

[0011] Further, two relatively arranged spiral conveying blades are provided in the screw conveyor. An outlet is provided at the center of the bottom end of the screw conveyor. The two relatively arranged spiral conveying blades simultaneously send the material conveyed from the two first star-shaped feeders to the outlet at the center of the bottom end of the screw conveyor. When the two relatively arranged spiral conveying blades are started, the material falling into the screw conveyor can be simultaneously sent to the outlet, achieving the purpose of rapid feeding.

[0012] Further, the two conical collecting hoppers are symmetrically arranged with respect to the central axis of the large bag filter. The two conical collecting hoppers symmetrically arranged with respect to the central axis of the large bag filter can maintain the stability of the large bag filter suspended.

[0013] Further, the feed inlet end and the discharge outlet end of the first star feeder are flange-connected to the bottom end of the conical collecting hopper and the feed inlet end of the screw conveyor. The flange connection method facilitates disassembly.

[0014] Further, the feed inlet end and the discharge outlet end of the second star feeder are flange-connected to the discharge outlet end of the conical buffer bin and the feed inlet of the rotary kiln. The flange connection method facilitates disassembly. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of an embodiment of the present invention.

[0016] The reference numerals in the drawings of the specification include: large bag filter 1, conical collecting hopper 2, first star feeder 3, screw conveyor 4, screw conveyor blade 5, conical buffer bin 6, vibrator 7, second star feeder 8. Detailed Description of the Invention

[0017] The following is further detailed through specific embodiments:

[0018] The embodiment is basically as shown in the attached Figure 1 figure:

[0019] A stable feeding device for a rotary kiln, as shown in Figure 1 the figure, includes a large bag filter 1 and two conical collecting hoppers 2 symmetrically arranged with respect to the central axis of the large bag filter 1. The bottom ends of the two conical collecting hoppers 2 are both flange-connected with a first star feeder 3. The discharge outlet ends of the two first star feeders 3 are flange-connected with a screw conveyor 4. Two screw conveyor blades 5 arranged oppositely are provided in the screw conveyor 4. The bottom end center of the screw conveyor 4 is provided with a discharge outlet. The two screw conveyor blades 5 arranged oppositely send the materials conveyed from the two first star feeders 3 to the discharge outlet at the bottom end center of the screw conveyor 4 at the same time. The discharge outlet end of the screw conveyor 4 is communicated with a weighable conical buffer bin 6. A pressure sensor (not shown in the figure) is provided at the bottom end of the conical buffer bin 6. Four vibrators 7 are provided on the outer periphery of the conical buffer bin 6. The four vibrators 7 are evenly distributed on the outer periphery of the conical buffer bin 6. The discharge outlet end of the conical buffer bin 6 is flange-connected with a second star feeder 8. The discharge outlet of the second star feeder 8 is communicated with the feed inlet of the rotary kiln.

[0020] The opening and closing of the first star feeder 3, the screw conveyor 4, the vibrator 7, and the second star feeder 8 are all controlled by a controller (not shown in the figure).

[0021] The specific implementation process is as follows:

[0022] The large bag dust collector 1 controls the pulse cleaning phosphoric acid iron powder material to fall into the conical collecting hopper 2 through the control program. The phosphoric acid iron powder material in the conical collecting hopper 2 is fed into the screw conveyor 4 through the first star feeder 3. The screw conveyor 4 conveys the phosphoric acid iron powder material to the conical buffer bin 6. The conical buffer bin 6 can weigh the material. When the material in the conical buffer bin 6 reaches the specified weight, the second star feeder 8 is started for feeding, and the feeding frequency of the second star feeder 8 is adjusted to ensure that the material in the conical buffer bin 6 will neither be emptied nor overfilled, but always fluctuate within a certain range, so as to realize the uniform feeding of the rotary kiln. Through the cooperation of the two feeders, namely the first star feeder 3 and the second star feeder 8, and the conical buffer bin 6 that can weigh, it is ensured that the material in the conical buffer bin 6 always fluctuates within the specified range, can always feed the rotary kiln evenly and stably, thereby stabilizing the product index, reducing the generation of unqualified products, improving the product qualification rate, reducing costs, and improving economic benefits.

[0023] The above are only the embodiments of the present invention. Common knowledge such as the specific structure and characteristics known in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A stable feeding device for a rotary kiln, comprising a large bag dust collector and two conical collecting hoppers arranged at the bottom of the large bag dust collector, the bottoms of the two conical collecting hoppers are fixedly connected with a first star-shaped feeder, characterized in that: The discharge port ends of the two first star-shaped feeders are detachably connected to a screw conveyor, the discharge port end of the screw conveyor is connected to a weighable conical buffer silo, the discharge port end of the conical buffer silo is provided with a second star-shaped feeder, and the discharge port of the second star-shaped feeder is connected to the feed port of the rotary kiln.

2. A rotary kiln stable feeding device according to claim 1, characterized in that: A pressure sensor is provided at the bottom end of the conical buffer silo, and a plurality of rappers are provided at the periphery of the conical buffer silo, and the plurality of rappers are evenly distributed at the periphery of the conical buffer silo.

3. A rotary kiln stable feeding device according to claim 2, characterized in that: The screw conveyor is provided with two oppositely arranged spiral conveying blades, and a discharge port is provided in the center of the bottom end of the screw conveyor. The two oppositely arranged spiral conveying blades simultaneously deliver the materials conveyed from the two first star-shaped feeders to the discharge port in the center of the bottom end of the screw conveyor.

4. A rotary kiln stable feeding device according to claim 3, characterized in that: The two conical collecting hoppers are symmetrically arranged about the central axis in the large bag dust collector.

5. A rotary kiln stable feeding device according to claim 4, characterized in that: The feed inlet end and the discharge inlet end of the first star-shaped feeder are flange-connected to the bottom end of the conical collecting hopper and the feed inlet end of the screw conveyor.

6. A rotary kiln stable feeding device according to claim 5, characterized in that: The feed port end and the discharge port end of the second star-shaped feeder are flange-connected with the discharge port end of the conical buffer silo and the feed port of the rotary kiln.

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