CN116280942A

CN116280942A - Screw feeding equipment

Info

Publication number: CN116280942A
Application number: CN202310348298.4A
Authority: CN
Inventors: 金文浩
Original assignee: Wisdri Engineering and Research Incorporation Ltd
Current assignee: Wisdri Engineering and Research Incorporation Ltd
Priority date: 2023-04-03
Filing date: 2023-04-03
Publication date: 2023-06-23

Abstract

The invention belongs to the technical field of material conveying, and particularly provides screw feeding equipment which comprises a driving device, a screw blade shaft and a cylinder body, wherein the driving device is connected with the screw blade shaft to drive the screw blade shaft to rotate; the blade end of the spiral blade shaft extends into the cylinder body to be suspended; the helical blade shaft is provided with a hollow inner cavity along the length direction; the hollow inner cavity is provided with an air inlet I; the hollow inner cavity is positioned in the cylinder body and is provided with a plurality of exhaust ports I communicated with the cylinder body; one end of the cylinder body is provided with a feed inlet, and the other end of the cylinder body is provided with a discharge outlet. The spiral feeding equipment provided by the invention adopts the rotation of the spiral blade shaft to realize the linear conveying of materials. Through set up the cavity inner chamber of taking air inlet and gas vent on helical blade axle, when the feeding conveying section takes place to block up, need not to take apart the maintenance, can dredge to the cavity inner chamber and block up to let in high-pressure inert gas, does not influence production, reduces economic loss.

Description

Screw feeding equipment

Technical Field

The invention belongs to the technical field of material conveying, and particularly relates to screw feeding equipment.

Background

The screw feeder is a new generation product integrating steady flow conveying, weighing metering and quantitative control of powder materials, is suitable for continuous metering and batching of powder materials in various industrial production environments, adopts a plurality of advanced technologies, has reliable operation and high control precision, and is particularly suitable for conveying materials in the fields of industrial smelting, calcining and the like. In the actual operation process, the powder or the materials conveyed by the feeder often contain larger objects or foreign matters, and the powder or the materials are easy to be blocked between the spiral blades of the spiral feeder and the machine shell. Moreover, the existing screw feeder is easy to compact due to the friction force of the wall of the shell, the manufacturing error of the screw pitches of the screw blades, the resistance caused by downward steering of the discharge hole and the like, and the effect of conveying pushing force, so that the density of materials in the feeding conveying section is increased, the filling rate of the materials is more than 100%, the materials which are backlogged between the screw pitches of the two screw blades rotate together with the screw blades, relative movement is not generated, the materials behind the screw blades are blocked, accumulation effect is generated, the blocking condition is aggravated, and the production is seriously affected. In general, the screw feeder can only be disassembled for maintenance under the condition of suspending production, so that the whole production system is influenced, time and labor are wasted, production time is delayed, unnecessary economic loss is caused, and new equipment is seriously replaced.

How to improve the existing screw feeder to avoid the blockage of the feeding conveying section becomes a problem to be solved urgently. And because the temperature of the smelting or calcining furnace is higher, the conveying mechanism often needs to meet the requirement of stable work in a high-temperature environment, and for some special materials, the problem that air enters a high-temperature hearth along with the materials to cause oxidation of the materials and influence the quality of products is avoided.

Therefore, the development of a feeding device which can dredge the blocked materials and can stably work in a high-temperature environment to effectively avoid high-temperature oxidation of the materials is quite significant.

Disclosure of Invention

The invention aims to provide a screw feeder which can prevent a feeding conveying section from being blocked, can carry out closed feeding and feeding in a high-temperature environment and can prevent high-temperature oxidation of materials caused by entering air.

The invention provides screw feeding equipment, which comprises a driving device, a screw blade shaft and a cylinder body, wherein the driving device is connected with the screw blade shaft and drives the screw blade shaft to rotate; the blade end of the spiral blade shaft extends into the cylinder body to be suspended; the helical blade shaft is provided with a hollow inner cavity along the length direction; the hollow inner cavity is provided with an air inlet I; the hollow inner cavity is positioned in the cylinder body and is provided with a plurality of exhaust ports I communicated with the cylinder body; one end of the cylinder body is provided with a feed inlet, and the other end of the cylinder body is provided with a discharge outlet.

Specifically, the spiral feeding equipment further comprises a receiving hopper, a replacement tank and a storage tank which are connected in series up and down; an upper sealing valve is arranged between the receiving hopper and the replacement tank; a lower sealing valve is arranged between the replacement tank and the storage tank; the storage tank is connected with the feed inlet of the cylinder body through a blanking valve.

Specifically, the bottom of the storage tank is provided with a level gauge.

Specifically, the discharge gate of above-mentioned replacement jar with the discharge gate of storage tank all is equipped with air inlet II, the feed inlet of replacement jar with the feed inlet of storage tank all is equipped with gas vent II, all is equipped with the ball valve on air inlet II and the gas vent II.

Specifically, the discharge hole of the cylinder is connected with a discharge cylinder, and the discharge cylinder is arranged on the furnace wall through a water-cooling flange.

Specifically, the cylinder is provided with an air inlet III.

Specifically, the assembly part of the spiral blade shaft and the cylinder body is provided with a material blocking spiral structure.

Specifically, the surface of the helical blade shaft is sprayed with a heat insulating material.

Specifically, the spiral vane shaft is sleeved with a large sprocket, the output end of the driving device is connected with a small sprocket, and the small sprocket is connected with the large sprocket through a chain.

Specifically, a bearing seat is arranged on the helical blade shaft, and the helical blade shaft is installed on an external support through the bearing seat.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the spiral feeding equipment provided by the invention adopts the rotation of the spiral blade shaft to realize the linear conveying of materials, and is simple and reliable. Through set up the cavity inner chamber of taking air inlet and gas vent on the helical blade axle, when the feeding conveying section takes place to block up, need not to take apart the maintenance of screw feeder, can dredge to the inner chamber and block up by introducing high pressure nitrogen gas or other inert gas, does not influence production, reduces economic loss.

2. According to the screw feeding equipment, the receiving hopper, the replacement tank and the storage tank are arranged in series up and down, so that inert gas is adopted to replace air entering along with raw materials, and the air is effectively prevented from entering a high-temperature furnace to cause oxidation of the materials; by arranging the large storage tank, the continuous feeding in the furnace is not influenced in the process of carrying out nitrogen replacement on raw materials, and meanwhile, the temporary material preparation function is also realized, and the necessary maintenance time is reserved for the material supply link; one discharging end of the cylinder body is connected with the high-temperature furnace shell through a water-cooling flange, so that the temperature of the furnace shell can be effectively prevented from being transmitted to the cylinder body, the vane shaft and the like, and in the feeding process, raw materials at the water-cooling flange are cooled, so that the temperature in the furnace can be effectively reduced from being transmitted into the cylinder body through the materials; the upper part of the cylinder body is provided with an air inlet, inert gas is input to ensure that the cylinder body is in inert gas atmosphere, and micro positive pressure relative to the atmosphere is maintained, so that air can be effectively prevented from entering the cylinder body through a sealing gap and further entering a furnace to cause oxidation; and when the material is conveyed for the first time, the air in the cylinder body can be replaced by introducing inert gas.

The present invention will be described in further detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic view of a screw feeding apparatus according to the present invention.

Fig. 2 is a schematic structural view of a screw feeding apparatus with a feeding unit according to the present invention.

FIG. 3 is a partial view of the connection of the screw blade shaft and the barrel in the screw feeder provided by the invention.

Reference numerals illustrate: 1. a receiving hopper; 2. an upper sealing valve; 3. a replacement tank; 4. a lower sealing valve; 5. a storage tank; 6. a blanking valve; 7. an air inlet II; 8. an exhaust port II; 9. a driving device; 10. a large sprocket; 11. a small sprocket; 12. a bearing seat; 13. a helical blade shaft; 14. a hollow interior cavity; 15. an air inlet I; 16. a material blocking spiral structure; 17. a cylinder; 18. an air inlet III; 19. a feed inlet; 20. an access opening; 21. a discharging cylinder; 22. a water-cooling flange; 23. a furnace wall; 24. a bracket; 25. a level gauge.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

Referring to fig. 1, the invention provides a screw feeding device, which comprises a driving device 9, a screw blade shaft 13 and a cylinder 17, wherein the driving device 9 is connected with the screw blade shaft 13 to drive the screw blade shaft 13 to rotate, the driving device 9 is preferably connected with a speed reducing motor of a frequency converter, and the speed of the screw blade shaft 13 can be controlled by controlling the speed of the speed reducing motor in a frequency conversion manner, so that the feeding speed is controlled; the blade end of the spiral blade shaft 13 extends into the cylinder 17 to be suspended; the helical blade shaft 13 is provided with a hollow inner cavity 14 along the length direction; the hollow inner cavity 14 is provided with an air inlet I15; the hollow inner cavity 14 is positioned in the cylinder 17 and is provided with a plurality of exhaust ports I communicated with the cylinder 17; one end of the cylinder 17 is provided with a feed inlet 19, the other end is provided with a discharge outlet, and the cylinder 17 can be provided with an overhaul port 20 so as to overhaul the helical blade shaft 13 and the like in the cylinder 17. In actual use, the feed inlet 19 of the cylinder 17 is connected with external feeding equipment, and the discharge outlet of the cylinder 17 is connected with a reaction furnace needing to be fed. The driving device 9 is started to drive the helical blade shaft 13 to rotate towards a specific direction, the raw materials are pushed to be conveyed into the furnace, and after the raw materials reach the tail end of the helical blade shaft 13, the raw materials conveyed before extrusion enter the high-temperature furnace, so that the linear conveying of the materials is realized. The materials are extruded into the furnace in an extrusion mode, so that the inside of the cylinder 17 and the inside of the conveying channel of the furnace wall 23 are fully extruded with the materials, the high-temperature gas in the furnace is blocked, and the high-temperature gas is prevented from channeling into the cylinder 17; and continuously cold materials are extruded into the tail end of the helical blade shaft 13, and materials with higher temperature close to a hearth are extruded into the furnace, so that the helical blade shaft 13 is always contacted with the colder materials, heat transfer can be effectively reduced, and overhigh temperature of the helical blade shaft 13 is avoided. When the feeding conveying section is blocked, high-pressure nitrogen or other inert gases are introduced into the cylinder 17 through the air inlet I15 of the hollow inner cavity 14 and the air outlet I communicated with the cylinder 17, and blocked materials are dredged by means of the impact force of the high-pressure gases.

Further, as shown in fig. 2, the screw feeding device further comprises a receiving hopper 1, a replacement tank 3 and a storage tank 5 which are connected in series up and down; an upper sealing valve 2 is arranged between the receiving hopper 1 and the replacement tank 3; a lower sealing valve 4 is arranged between the replacement tank 3 and the storage tank 5; the storage tank 5 is connected with a feed inlet 19 of the cylinder 17 through a blanking valve 6. The material is subjected to the hopper 1, the displacement tank 3 and the storage tank 5 and then enters the cylinder 17. Through setting up great storage tank 5, do not influence to the continuous feeding in stove, still play the effect of interim material preparation, reserve necessary maintenance time for the material supply link.

In order to prevent the material high temperature oxidation caused by the entering air, the discharge port of the replacement tank 3 and the discharge port of the storage tank 5 are respectively provided with an air inlet II7, the feed port of the replacement tank 3 and the feed port of the storage tank 5 are respectively provided with an air outlet II8, and ball valves are respectively arranged on the air inlet II7 and the air outlet II8. The gas inlet II7 is communicated with nitrogen or other inert gases. The nitrogen is adopted to replace air entering along with the raw materials, so that the air is effectively prevented from entering a high-temperature furnace, and the oxidation of the materials is avoided. When the equipment is in operation, materials firstly enter a receiving hopper 1, then an upper sealing valve 2 is opened, a lower sealing valve 4 is kept closed, and raw materials enter a replacement tank 3; and then the upper sealing valve 2 is closed, the ball valves of the air inlet II7 and the air outlet II8 at the lower part of the replacement tank 3 are opened, nitrogen is introduced into the ball valves through the air inlet II7 to replace air in the replacement tank 3, the air is discharged through the air outlet II8, the ball valves are closed after the replacement is finished, the lower sealing valve 4 is opened, raw materials enter the storage tank 5, and the air inlet II7 and the air outlet II8 similar to the replacement tank 3 are also arranged at the upper part and the lower part of the storage tank 5. When the material is fed for the first time, like the replacement tank 3, nitrogen replacement is carried out on air in the storage tank 5, so that the air is prevented from entering the furnace; after the raw materials in the replacement tank 3 enter the storage tank 5, the lower sealing valve 4 is closed, and the replacement tank 3 can be charged again by adopting the charging and replacement operations; simultaneously, the blanking valve 6 can be opened, and raw materials enter the cylinder 17 of the spiral feeding equipment.

Specifically, the bottom of the storage tank 5 is provided with a level gauge 25. When the material in the storage tank 5 is less, prompt timely charging can avoid the interruption of the feeding in the furnace, meet continuous production, and simultaneously avoid the material in the cylinder 17 to be emptied, so that no cold material protection exists and the equipment is overheated and damaged.

Further, the discharge hole of the cylinder 17 is connected with a discharge cylinder 21, the discharge cylinder 21 is arranged on the furnace wall 23 through a water-cooling flange 22, so that the temperature of the furnace shell can be effectively prevented from being transferred to the cylinder 17, the spiral blade shaft 13 and other structures, in the feeding process, raw materials at the water-cooling flange 22 are cooled, and the temperature in the furnace can be effectively reduced and transferred to the cylinder 17 through the materials. The discharge opening of the cylinder 17 is preferably provided at the end of the cylinder 17.

Further, the cylinder 17 is provided with an air inlet III18. The inlet III18 is preferably positioned near the inlet 19 to communicate with nitrogen or other inert gas. The nitrogen atmosphere in the cylinder 17 is enabled to be in a nitrogen atmosphere by inputting nitrogen with a certain pressure, and micro positive pressure relative to the atmosphere is kept, so that air can be effectively prevented from entering the cylinder 17 through a sealing gap and then entering a furnace to cause oxidation; and the air in the cylinder 17 can be replaced by introducing nitrogen when the material is conveyed for the first time. In addition, by introducing cooler nitrogen gas into the cylinder 17, the high-temperature gas in the furnace can be prevented from flowing into the cylinder 17, so that the cylinder 17 and the helical blade shaft 13 are deformed and even damaged at high temperature, and the cylinder 17 and the helical blade shaft 13 are cooled to a certain extent.

In a refinement embodiment, as shown in fig. 3, a material blocking spiral structure 16 is arranged at the assembly position of the spiral blade shaft 13 and the cylinder 17, and the spiral direction of the material blocking spiral structure is opposite to the direction of entering the shaft end seal, so that fine particles in the material can be effectively prevented from entering the shaft end seal, and the seal and the shaft are worn, thereby influencing the service life and the reliability of the equipment.

Preferably, the spiral blade shaft 13 is made of stainless steel or other high-temperature resistant materials, and the surface of the spiral blade shaft 13 is sprayed with a heat insulation material, so that the influence of heat transferred or radiated by a high-temperature hearth on the strength of the spiral blade shaft 13 is effectively avoided, and the deformation damage or blockage of the spiral blade shaft 13 is avoided.

Further, a large chain wheel 10 is sleeved on the spiral vane shaft 13, the output end of the driving device 9 is connected with a small chain wheel 11, and the small chain wheel 11 is connected with the large chain wheel 10 through a chain; the driving device 9 drives the small chain wheel 11 to rotate, and the small chain wheel 11 drives the large chain wheel 10 to rotate through a chain so as to drive the helical blade shaft 13 to rotate. Because the chain transmission is flexible transmission, the influence of the heated extension of the blade on the driving device 9 is avoided, and the driving device 9 is convenient to overhaul and replace.

Further, a bearing seat 12 is provided on the helical blade shaft 13, and the helical blade shaft 13 is mounted on an external bracket 24 through the bearing seat 12, so that the helical blade shaft 13 forms a cantilever structure and extends into the cylinder 17. The bearing pedestal 12 is arranged outside the cylinder 17, so that the bearing pedestal 12 is prevented from occupying a raw material conveying channel, the bearing pedestal 12 is prevented from being positioned in a high-temperature environment in the cylinder 17, and the reliability of equipment is improved.

In an optimized embodiment, two water-cooling bearing seats 12 are sequentially arranged on the helical blade shaft 13 along the length direction, the helical blade shaft 13 is obliquely arranged on the bracket 24 through the water-cooling bearing seats 12, and the inclination angle is smaller than the material stacking angle, so that the resistance of material conveying can be reduced, and the material clamping is avoided. Simultaneously, the materials in the conveying channel and the barrel 17 are not easy to slide into the furnace by themselves, and the materials are extruded into the furnace through the blades of the spiral blade shaft 13, so that the barrel 17 and the conveying channel are fully extruded with the materials, thereby forming the barrier to high-temperature gas in the furnace and avoiding the high-temperature gas from channeling into the barrel 17; and continuously cold materials are extruded into the tail end of the helical blade shaft 13, and materials with higher temperature close to a hearth are extruded into the furnace, so that the helical blade shaft 13 is always contacted with the colder materials, heat transfer can be effectively reduced, and overhigh temperature of the helical blade shaft 13 is avoided.

The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.

Claims

1. Screw feeder equipment, including drive arrangement (9), helical blade axle (13) and barrel (17), its characterized in that: the driving device (9) is connected with the helical blade shaft (13) and drives the helical blade shaft (13) to rotate; the blade end of the spiral blade shaft (13) extends into the cylinder (17) to be suspended; the helical blade shaft (13) is provided with a hollow inner cavity (14) along the length direction; the hollow inner cavity (14) is provided with an air inlet I (15); the hollow inner cavity (14) is positioned in the cylinder (17) and is provided with a plurality of exhaust ports I communicated with the cylinder (17); one end of the cylinder body (17) is provided with a feed inlet (19), and the other end is provided with a discharge outlet.

2. A screw feeder apparatus as claimed in claim 1, wherein: the device also comprises a receiving hopper (1), a replacement tank (3) and a storage tank (5) which are connected in series up and down; an upper sealing valve (2) is arranged between the receiving hopper (1) and the replacement tank (3); a lower sealing valve (4) is arranged between the replacement tank (3) and the storage tank (5); the storage tank (5) is connected with a feed inlet (19) of the cylinder (17) through a blanking valve (6).

3. A screw feeder apparatus as claimed in claim 2, wherein: the bottom of the storage tank (5) is provided with a material level gauge (25).

4. A screw feeder apparatus as claimed in claim 2, wherein: the utility model discloses a ball valve, including displacement jar (3), storage tank (5), discharge gate, ball valve, the discharge gate of displacement jar (3) with the discharge gate of storage tank (5) all is equipped with air inlet II (7), the feed inlet of displacement jar (3) with the feed inlet of storage tank (5) all is equipped with gas vent II (8), all is equipped with ball valve on air inlet II (7) and gas vent II (8).

5. A screw feeder apparatus as claimed in claim 1, wherein: the discharge hole of the cylinder body (17) is connected with a discharge cylinder (21), and the discharge cylinder (21) is arranged on the furnace wall (23) through a water-cooling flange (22).

6. A screw feeder apparatus as claimed in claim 1, wherein: an air inlet III (18) is arranged on the cylinder (17).

7. A screw feeder apparatus as claimed in claim 1, wherein: a material blocking spiral structure (16) is arranged at the assembly position of the spiral blade shaft (13) and the cylinder body (17).

8. A screw feeder apparatus as claimed in claim 1, wherein: the surface of the helical blade shaft (13) is sprayed with a heat insulating material.

9. A screw feeder apparatus as claimed in claim 1, wherein: the spiral vane shaft (13) is sleeved with a large chain wheel (10), the output end of the driving device (9) is connected with a small chain wheel (11), and the small chain wheel (11) is connected with the large chain wheel (10) through a chain.

10. A screw feeder apparatus as claimed in claim 1, wherein: the screw blade shaft (13) is provided with a bearing seat (12), and the screw blade shaft (13) is installed on an external bracket (24) through the bearing seat (12).