CN103879781A - Rotary blowing type powder feeder - Google Patents

Abstract

The invention discloses a rotary purge type powder feeder, which comprises a silo and a screw conveyor shell. The outlet at the lower end of the silo communicates with the inner cavity of the screw conveyor shell. dragon. The tail of the screw auger passes through the shell of the screw conveyor, and the passing end is connected with the power mechanism through the transmission mechanism. The screw auger is provided with a central gas channel along the axial direction, and the tail of the gas channel is connected to the fan through the air pipe; the front end of the screw auger is provided with a small hole communicating with the gas channel; the small hole communicates the gas channel with the conical spray area. The small hole in the front section of the screw auger of the present invention rotates with the rotation of the screw auger shaft, so that the gas ejected from the small hole forms an automatic rotating and purging effect on the conical spraying area at the front end of the screw conveyor shell, avoiding mineral powder particles, Especially viscous fine mineral powder particles agglomerate or adhere to the wall surface to realize continuous conveying and fluidized spraying of powder.

Description

Rotary purge powder feeder

technical field

The invention belongs to a powder feeder, and in particular relates to a feeder which uses a screw auger for forced feeding and uses airflow to rotate and purge for powder conveying, so that it can quantitatively and continuously feed the feeder, which belongs to the powder feeding technology.

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Background technique

In the extraction and separation process of mineral resources, it is often necessary to use the method of pneumatic conveying to continuously supply raw materials into the reactor quantitatively and continuously, such as high titanium slag, ultrafine artificial rutile, etc. Due to the strong inter-particle force of fine particles, mutual adhesion and coalescence occur, and when they are pneumatically conveyed, they are easy to stick to block the pipe and adhere to the pipe wall, resulting in a decrease in the efficiency of pneumatic conveying, and some raw materials will also Cause corrosion to the pipeline, affect the raw material transportation process and damage the transportation pipeline.

For the research on the feeding of viscous fine particles, the patent ZL200420115359.5 discloses a quantitative continuous feeding device for viscous powders, which is suitable for feeding viscous fine powders to medium and low pressure reactors, and fine powders with better fluidization performance can also be used at small material rates. It can realize continuous, uniform and stable feeding. This kind of method has complicated processing and cannot realize high-pressure conveying. Patent CN102963737A discloses a powder supply device that can improve the quantitative accuracy of the powder raw materials to be transported. A plurality of dispersing members protruding from the inner surface of the cylinder to the inner space and fixed on the cylinder along the circumferential direction are used. The powder raw material conveyed in the direction of the axial direction, with the aid of multiple dispersing members to provide resistance, increase the compression effect on the powder raw material, and at the same time make the compressed powder raw material contact with multiple dispersing members to disperse the powder raw material. This method There are many internal components, and the viscous fine powder is easy to adhere and stick to the wall of the device. Patent CN103434803A discloses a pulverized coal screw conveying device, which is equipped with a balanced air supply device, and the pulverized coal is transported smoothly without clogging. Good, good rigidity, the bearing seat is set outside the shell, the working environment is good, the parts wear less, and the service life is long. Patent CN103253488A discloses an anti-clogging screw conveyor. This invention has simple structure, low manufacturing cost, easy maintenance, and is not easy to cause damage to equipment due to material swelling. Patent CN202594397U discloses a high-pressure continuous powder quantitative delivery device. Since the pressure in the weighing chamber is always equal to the pressure in the pipeline, the pressure change in the delivery pipeline will not affect the supply and measurement accuracy. Patent CN102530560A discloses an activated carbon powder conveying process system, which effectively reduces the emission of harmful gases in flue gas emissions, and promotes the development of environmental protection equipment and environmental protection engineering technology. Patent CN101704453A discloses a pneumatic conveying system with coexistence of dilute and dense phases, which is applied in the field of powder conveying. In the case of low air source wind pressure, the conveying form of coexistence of dilute and dense phases is achieved, with low energy consumption and high conveying ratio. , good conveying stability and other advantages, it is a system suitable for powder conveying with low pressure head.

These classic feeders or feeding systems are all realized by separating quantitative feeding and powder conveying. The structure is complex, and the rotational kinetic energy of the screw auger cannot be fully utilized, which reduces the efficiency of the feeder and causes unnecessary energy loss. . And because the fine particles have a strong inter-particle force, they adhere to each other and coalesce. When they are pneumatically conveyed, they are easy to stick to block the pipe and adhere to the pipe wall, resulting in a decrease in the efficiency of pneumatic conveying. It will cause corrosion to the pipeline, affect the raw material transportation process and damage the transportation pipeline.

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Contents of the invention

In view of the above-mentioned shortcomings in the prior art, the purpose of the present invention is to provide a powder feeder with a simple structure, which can well avoid the adhesion of fine particles to the wall and the agglomeration between each other, and reduce the working energy consumption.

Technical scheme of the present invention is realized like this:

The rotary purge powder feeder includes a silo with a powder inlet and outlet and a horizontally placed screw conveyor shell. The front end of the screw conveyor shell is a 15°~30° conical injection area. The outlet communicates with the inner cavity of the screw conveyor shell and is provided with a control valve at the connecting position, and a screw auger is arranged in the screw conveyor shell; Supported by the bearing seat, the outlet end is connected to the power mechanism through the transmission mechanism at the same time, and the power mechanism drives the screw auger to rotate. The screw auger is provided with a central gas channel along the axial direction, and the tail of the gas channel is connected to the fan through the air duct A small hole communicating with the gas channel is provided at the front end of the screw auger; the outlet of the small hole is located at the connection between the front end of the screw conveyor shell and the conical injection area, and communicates the gas channel with the conical injection area.

Further, the small holes are composed of horizontal small holes and oblique small holes uniformly distributed around the horizontal small holes in a divergent distribution. The horizontal small holes and the axis of the gas passage are on the same straight line. The angle between them is 30°~45°.

The small hole in the front section of the screw auger of the present invention rotates with the rotation of the screw auger shaft, so that the gas sprayed from the small hole forms an automatic rotating and purging effect on the conical spraying area at the front end of the screw conveyor shell, avoiding mineral powder particles, Especially viscous fine mineral powder particles agglomerate or adhere to the wall to realize continuous conveying and fluidized spraying of powder.

Furthermore, a balance air duct is provided between the air duct and the silo, the connection between the balance air duct and the silo is located at the upper end of the silo, the connecting section between the air duct and the tail of the gas channel is the main air duct, and the connecting section with the fan is Main air duct.

The power mechanism is a motor, and the transmission mechanism is a gear pair.

The spiral auger with internal gas channel of the present invention has the functions of forced feeding and air supply at the same time, and the conveying gas is rotated and purged to the conveying pipeline due to the rotation of the auger, without any external accessories inside and outside the feeder A swirling flow with strong shearing action is formed to prevent viscous fine particles from agglomerating and sticking to the pipe wall.

Compared with the prior art, the present invention makes full use of the kinetic energy of the screw auger rotation, not only realizes the forced feeding, but also converts part of the energy into the rotational kinetic energy of the airflow, achieves the purpose of rotary purging, and can well avoid fine The bonding of particles to the wall surface and the agglomeration between each other make the viscous fine particles transport stably, improve the feeding efficiency, prolong the life of the pipeline, and reduce the working energy consumption.

The invention can continuously feed quantitatively, is not limited by the pressure of the reactor, has no external attachments inside and outside the feeder, has a simpler structure, and works more reliably.

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Description of drawings

Figure 1 - Schematic diagram of the structure of the feeder of the present invention. Arrows in the figure indicate the direction of airflow.

Among them, 1-powder inlet; 2-silo; 3-screw conveyor shell; 4-balance air duct; 5-main air duct; 6-general air duct; 7-screw auger; 8-bearing; - gear; 10 - gas channel; 11 - horizontal small hole; 12 - motor; 13 - control valve; 14 - bearing seat; 15 - oblique small hole.

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Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1 , the rotary purge type powder feeder of the present invention includes a silo 2 with a powder inlet and outlet and a horizontally placed screw conveyor housing 3, the powder inlet 1 is located at the upper part of the silo 2, and the silo 2 The outlet at the lower end communicates with the inner cavity of the screw conveyor housing 3 and is provided with a control valve 13 at the connecting position. The front end of the screw conveyor shell is a conical spray area of 15°~30°. A screw auger 7 is provided in the screw conveyor housing 3, the tail of the screw auger 7 passes through the screw conveyor housing 3, the end of which is passed out is supported by a bearing 8 and a bearing seat 14, and the end of which is passed through a transmission mechanism at the same time It is connected with the power mechanism, and the screw auger 7 is driven to rotate by the power mechanism. The screw auger 7 is provided with a central gas channel 10 along the axial direction, and the tail of the gas channel 10 is connected to the fan through an air duct; a small hole communicating with the gas channel is provided at the front end of the screw auger 7 (that is, the powder conveying direction) ; The outlet of the small hole is located at the connection between the front end of the screw conveyor shell and the conical injection area, connecting the gas passage with the conical injection area.

Further, in order to make the air flow form a strong rotary sweeping effect, the small holes are composed of horizontal small holes 11 and oblique small holes 15 uniformly distributed around the horizontal small holes 11 in a divergent distribution. The horizontal small holes 11 and the gas passage 10 axes are located on the same straight line, and the angle between the oblique small hole 15 and the horizontal small hole 11 is 30 ° ~ 45 °. The diameter and the number of the small holes are determined according to the size of the screw auger and actual needs.

Furthermore, a balanced air duct 4 is provided between the air duct and the silo 2, the connection between the balanced air duct 4 and the silo 2 is located at the upper end of the silo 2, and the connecting section between the air duct and the tail of the gas channel is the main air duct 5 , the connecting section with the blower fan is the total air duct 6.

During actual design, the power mechanism is a motor 12, and the transmission mechanism is a gear pair consisting of two meshing gears 9, one of which is connected to the output shaft of the motor 12, and the other gear 9 is sleeved on the exit section of the screw auger 7.

The working principle of this powder feeder: the powder material to be transported enters the silo 2 from the powder inlet 1, then closes the powder inlet 1, turns on the motor 12 and the fan, and makes the conveying gas flow along the main air duct 6 and the main air duct 5 Enter the screw auger 7 with internal gas channel, and the conveying gas rotates and flows with the screw auger 7 with internal channel, so as to realize purging. After the system is running stably, open the control valve 13, and the powder material is balanced Due to the pressure of the air duct 4 and its own gravity, it enters the screw conveyor shell 3 and falls on the thread of the screw auger 7 with internal passages. Due to the rotation of the auger 7 with internal passages, the powder material is forced to be conveyed To the front end of the screw auger 7 with an internal channel, at this time, the purpose of conveying powder is achieved due to the rotating purge of the gas. This can not only realize the transportation of fine powder particles, but also effectively reduce the agglomeration of fine powder and the adhesion to the wall of the reactor, and there is no external accessory device in the reactor, the operation and control are simple, the operation and maintenance costs are low, and the process application and scale-up are easy to realize .

In the present invention, the middle of the screw auger for forced feeding is opened, so that the airflow flows along the direction of feeding, and the outlet is designed in the form of a multi-hole inclination outward. The agitation of the airflow makes it difficult for the viscous fine particles to agglomerate and stick to the wall of the device. At the same time, the quality of the screw auger is reduced, the load is reduced, and the rotational kinetic energy of the screw auger is fully utilized. The feeder is simple to manufacture, convenient to operate and control, low in operating costs, easy to realize process application and enlargement, and realizes continuous quantitative feeding and conveying of viscous fine particles.

The present invention is specially designed for the powder feeder, and the thread pitch and thread size of the screw auger can be selected according to the particle size of the conveyed material in the actual implementation process.

The above-mentioned embodiments of the present invention are only examples for illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other variations and modifications in various forms can be made on the basis of the above description. All the implementation manners cannot be exhaustively listed here. All obvious changes or changes derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims (4)

1. rotation sweeping type powder feed appliance, comprise and there is the feed bin (2) of powder import and export and the auger loader housing (3) of horizontal positioned, the lower end outlet of feed bin communicates with auger loader housing inner chamber and is provided with control cock (13) in connection bit, is provided with spiral-poker (7) in auger loader housing (3); Spiral-poker afterbody passes from auger loader housing, traversing through end supports by bearing and bearing seat, traversing through end is connected with actuating unit by transmission device simultaneously, drive spiral-poker to rotate by actuating unit, it is characterized in that: described auger loader housing front end is the conical jet district of 15 ° ~ 30 °, spiral-poker (7) axle center is provided with gas passage (10), and gas passage afterbody is connected with blower fan by airduct; Be provided with at spiral-poker axle front end the aperture communicating with gas passage, aperture is communicated with gas passage and conical jet district.

2. rotation sweeping type powder feed appliance according to claim 1, it is characterized in that: described aperture is Small Inclined Holes (15) formation of dispersing distribution by horizontal apertures (11) with around being evenly distributed on horizontal apertures, horizontal apertures (11) is located along the same line with gas passage (10) axis, and the angle between Small Inclined Holes (15) and horizontal apertures (11) is 30 ° ~ 45 °.

3. rotation sweeping type powder feed appliance according to claim 1, it is characterized in that: between airduct and feed bin, be provided with balance wind pipe, the connecting portion of balance wind pipe and feed bin is positioned at feed bin upper end, and airduct and gas passage afterbody linkage section are air main, with blower fan linkage section be blast main.

4. rotation sweeping type powder feed appliance according to claim 1, is characterized in that: described actuating unit is motor, and transmission device is gear pair.