阅读说明：本技术 粉料输送计量装置 (Powder conveying and metering device ) 是由 詹静 王吉珍 熊灿 李华辉 李杏伟 李翔 陈权 于 2021-08-09 设计创作，主要内容包括：本发明公开一种粉料输送计量装置,包括：料室,用于承载粉料；和送料螺旋,位于料室下方,用于推送自料室落下的粉料；其中,料室和送料螺旋之间设有疏松填充装置,疏松填充装置包括疏松电机、通过疏松电机驱动的疏松轴,以及沿着疏松轴的轴向以不同角度分布的疏松叶片。相对于现有技术,本发明粉料输送计量装置在料室和送料螺旋之间设置疏松填充装置,疏松填充装置上以不同角度分布的疏松叶片将聚集的粉料沿轴向推动铺开,在料室粉料下落流量变化或短暂中断落料时,能保证粉料输送计量装置内暂存粉料充满送料螺旋的进料口,保证送料螺旋内粉料的稳定填充。(The invention discloses a powder conveying and metering device, which comprises: the material chamber is used for bearing powder; the feeding screw is positioned below the material chamber and used for pushing the powder falling from the material chamber; wherein, be equipped with loose filling device between material room and the pay-off spiral, loose filling device includes loose motor, through the loose axle of loose motor drive to and along the loose blade of axle axial with different angle distributions. Compared with the prior art, the powder conveying and metering device is provided with the loosening and filling device between the material chamber and the feeding screw, the loosening blades distributed at different angles on the loosening and filling device push and spread the gathered powder along the axial direction, and when the falling flow of the powder in the material chamber changes or the blanking is interrupted for a short time, the powder conveying and metering device can ensure that the powder temporarily stored in the powder conveying and metering device is full of the feeding hole of the feeding screw, and the stable filling of the powder in the feeding screw is ensured.)

1. A powder conveying and metering device is characterized by comprising:

the material chamber is used for bearing powder; and

the feeding screw is positioned below the material chamber and used for pushing the powder falling from the material chamber;

and a loosening filling device is arranged between the material chamber and the feeding screw and used for pushing the powder which is spread from the material chamber and falls into the feeding screw.

2. The powder delivery metering device of claim 1, wherein the loosening and filling device comprises a loosening motor, a loosening shaft driven by the loosening motor, and loosening blades distributed at different angles along the axial direction of the loosening shaft.

3. The powder conveying and metering device of claim 2, wherein a feeding motor mounting base is arranged on the material chamber, a feeding motor mounting plate is arranged on the feeding motor mounting base, a feeding motor is mounted on the motor mounting plate through a speed reducer, and the feeding motor drives the feeding screw to feed.

4. The powder conveying and metering device of claim 3, wherein the feeding motor mounting plate is connected with the feeding motor mounting base through a rotating pin shaft on one side and a screw lock on the other side.

5. The powder conveying and metering device of claim 4, wherein one end of the feeding screw, which is adjacent to the feeding motor, is in splined connection with a shaft head of the speed reducer, and the other end of the feeding screw is locked by a chuck hoop.

6. The powder conveying and metering device of claim 3, wherein the feeding motor is a variable frequency motor.

7. The powder delivery metering device of claim 6, wherein the feed motor is operated at a speed of no more than 145 rpm.

8. The powder delivery metering device of claim 1, wherein the pitch of the feed screw is 45mm to 55 mm.

9. The powder delivery metering device of claim 1, wherein the direction of rotation of the loosening blade and the direction of rotation of the feed screw are reversed.

10. The powder conveying and metering device of claim 1, wherein a level meter is arranged on the material chamber and above the feeding screw, and the level meter gives an alarm when the powder entering the feeding screw is insufficient.

11. The powder conveying and metering device of any one of claims 1 to 10, wherein the feed screw is provided with a feed inlet and a discharge outlet, and the discharge outlet is provided with a scraper.

Technical Field

The invention belongs to the technical field of powder metering and conveying, and particularly relates to a powder conveying and metering device.

Background

The middle-low radioactive solid waste generated by nuclear technology application of nuclear power plants or nuclear industry and the like, such as waste filter elements, is generally treated by adopting a process of filling and fixing after barreling, and the materials used for filling comprise cement powder. In a nuclear power plant, the cement storage position and the grouting operation room are usually not at the same position, and a movable material chamber is used for transferring cement to the grouting operation room before grouting. In order to meet the requirements of the grouting process of continuous feeding, continuous stirring and continuous pumping of the movable grouting equipment, the cement powder needs to meet the requirement of uniform and stable quality in any time period in the conveying process; in order to ensure that the waste bag fixed by grouting has good mechanical property, chemical stability and irradiation stability so as to meet the requirements of later storage and disposal, the method has extremely high requirement on the quality precision of cement powder.

In the related art, the powder is usually metered by a weighing and metering device with a weighing sensor, but the weighing and metering device usually performs batch quantitative weighing and cannot ensure uniformity and stability at any moment in the conveying process. When the total weight of the loaded powder material chamber and the screw conveyor is too large, the weighing device has too high requirement on the precision of the existing weighing sensors, and meanwhile, in order to ensure the quality precision of weighing, the weighing device needs to be fixedly installed and ensure the levelness of a plurality of weighing sensors, so that the weighing device is not suitable for the use working condition that the site cement material chamber of the nuclear power plant moves and loads materials for many times.

In the related art, the cement powder metering device can also be provided with a star-shaped feeder and an inclined screw conveyer, but the screw conveyer for metering is complex in structure, large in volume and not compact enough in grouting equipment structure.

Disclosure of Invention

The invention aims to: overcomes at least one defect in the prior art, and provides a powder conveying and metering device which can realize uniform and stable quality in any time period in the powder conveying process.

In order to achieve the above object, the present invention provides a powder conveying and metering device, comprising:

the material chamber is used for bearing powder; and

the feeding screw is positioned below the material chamber and used for pushing the powder falling from the material chamber;

and a loosening filling device is arranged between the material chamber and the feeding screw and used for pushing the powder which is spread from the material chamber and falls into the feeding screw.

According to one embodiment of the powder conveying and metering device, the loosening and filling device comprises a loosening motor, a loosening shaft driven by the loosening motor, and loosening blades distributed at different angles along the axial direction of the loosening shaft.

According to one embodiment of the powder conveying and metering device, a feeding motor mounting base is arranged on the material chamber, a feeding motor mounting plate is arranged on the feeding motor mounting base, a feeding motor is mounted on the motor mounting plate through a speed reducer, and the feeding motor drives the feeding screw to feed.

According to one embodiment of the powder conveying and metering device, the feeding motor mounting plate is connected with one side of the feeding motor mounting base through a rotating pin shaft, and the other side of the feeding motor mounting base is connected through a screw lock.

According to one embodiment of the powder conveying and metering device, one end of the feeding screw, which is close to the feeding motor, is connected with a shaft head spline of the speed reducer, and the other end of the feeding screw is locked through a chuck hoop.

According to one embodiment of the powder conveying and metering device, the feeding motor is a variable frequency motor.

According to one embodiment of the powder delivery and metering device of the present invention, the rotational speed of the feed motor does not exceed 145 rpm.

According to one embodiment of the powder conveying and metering device, the pitch of the feeding screw is 45mm-55 mm.

According to one embodiment of the powder conveying and metering device, the rotation direction of the loosening blade and the rotation direction of the feeding screw are opposite.

According to one embodiment of the powder conveying and metering device, a material level meter is arranged on the material chamber and is positioned above the feeding spiral, and the material level meter gives an alarm when the powder entering the feeding spiral is insufficient.

According to one embodiment of the powder conveying and metering device, the feeding screw is provided with a feeding hole and a discharging hole, and the discharging hole is provided with a scraper.

Compared with the prior art, the powder conveying and metering device is provided with the loosening and filling device between the material chamber and the feeding screw, the loosening and filling device is provided with the loosening blades distributed at different angles to push and spread the gathered powder along the axial direction, and when the falling flow of the powder in the material chamber changes or the blanking is interrupted for a short time, the powder temporarily stored in the powder conveying and metering device can be ensured to be full of the feeding hole of the feeding screw, so that the stacking density of the powder entering the feeding hole of the feeding screw is consistent, the uniform and stable quality of the powder in any time period in the powder conveying process is realized, and the stable filling of the powder in the feeding screw is ensured.

Drawings

The powder conveying and metering device and the technical effects thereof of the present invention will be described in detail with reference to the accompanying drawings and the detailed description, wherein:

FIG. 1 is a schematic perspective view of a powder conveying and metering device according to the present invention.

FIG. 2 is a schematic cross-sectional view of the powder conveying and metering device of the present invention.

Wherein:

1- -material chamber; 2-feeding motor mounting plate; 3- -feeding motor; 4- -rotating the pin shaft; 5-feeding motor mounting base; 6- -level meter; 7- -the shell; 8- -discharge port connecting end; 9- -discharge hole; 10-chuck hoop; 11- -tail bearing; 12- -loosening electric machine; 13- -loose fill apparatus; 14- -loose leaves; 15-feeding motor shaft sleeve; 16- -feeding screw shaft head; 17- -a feed screw; 18- -a squeegee; 19- -reverse helical blades; 20- -a chuck.

Detailed Description

In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1 and 2, the present invention provides a powder conveying and metering device, which includes:

the material chamber 1 is used for bearing powder; and

the feeding screw 17 is positioned below the material chamber 1 and used for pushing powder falling from the material chamber 1;

wherein, a loose filling device 13 is arranged between the material chamber 1 and the feeding screw 17, and the loose filling device 13 is used for pushing and spreading the powder falling from the material chamber 1 into the feeding screw 17.

Referring to fig. 1, a feeding interface flange is disposed on the top of the material chamber 1 and flexibly connected to the bin to receive the powder from the bin.

The loosening and filling device 13 comprises a loosening motor 12, a loosening shaft (not labeled) driven by the loosening motor 12, and loosening blades 14 distributed at different angles along the axial direction of the loosening shaft, and the rotating direction of the loosening blades 14 is opposite to that of the feed screw 17. The loose filling device 13 is arranged horizontally above the feed screw 17, and the loose filling device 13 and the feed screw 17 run synchronously during operation and do not interfere with each other. In the embodiment shown in fig. 1, the loosening blades 14 are spaced axially along the loosening axis, with the angle of each loosening blade 14 relative to the loosening axis being different.

The material chamber 1 is provided with a feeding motor mounting base 5, the feeding motor mounting base 5 is provided with a feeding motor mounting plate 2, the feeding motor mounting plate 2 is provided with a feeding motor 3 through a speed reducer (not shown), and the feeding motor 3 drives a feeding screw 17 to feed. In the embodiment shown in fig. 1, the feeding motor mounting plate 2 is connected to the feeding motor mounting base 5 at one side by a rotating pin 4 and at the other side by a screw lock. During maintenance, the driving end feeding motor mounting plate 2 can be lifted only by loosening the screw lock, and the feeding motor mounting plate 2 rotates around the rotating pin shaft 4, so that maintenance of the feeding motor 3 and the shell 7 can be realized. The feeding motor 3 does not need to be taken down in the maintenance process, and the weight of the feeding motor 3 can be borne by the rotating pin shaft 4, so that the maintenance is convenient.

As shown in fig. 2, the feeding screw 17 is arranged horizontally, which has higher efficiency than the feeding screw arranged obliquely, and the feeding screw arranged horizontally has smaller axial diameter and compact overall structure under the requirement of the same conveying capacity. One end of the feeding screw 17, which is close to the feeding motor 3, is connected with a shaft head spline of the speed reducer through the matching of a feeding screw shaft head 16 and a feeding motor shaft sleeve 15, the other end of the feeding screw is locked through a tail bearing 11 and a chuck hoop 10, after the chuck hoop 10 is loosened, a chuck 20, which is far away from the tail bearing 11 of the feeding motor 3, is separated from the shell 7, the feeding screw 17 can be pulled out manually, and the maintenance and the cleaning are convenient. When the powder conveying and metering device is used for conveying powder with strong polishing performance, the quick-wear parts are easy to replace.

According to one embodiment of the powder conveying and metering device of the present invention, the feeding motor 3 is a variable frequency motor, and the rotation speed of the feeding motor 3 can be changed (the rotation speed of the feeding motor 3 does not exceed 145rpm in general) by adjusting the frequency of the feeding motor 3, so as to adjust the conveying flow rate of the powder. Aiming at the powder with different densities, the conveying flow of the powder can be adjusted in a larger range by adjusting the frequency of the feeding motor 3, and the metering precision is ensured. In addition, a level meter 6 is arranged above the feeding screw 17 on the material chamber 1, and the level meter 6 gives an alarm when the powder entering the feeding screw 17 is insufficient.

Referring to fig. 2, the feeding screw 17 is disposed in the housing 7, and the gap between the diameter of the feeding screw 17 and the inner diameter of the housing 7 is 2mm, so as to ensure that the powder at the feeding port moves forward along the bottom of the groove, and the pitch of the feeding screw 17 is preferably 45mm-55 mm. The feeding screw 17 is provided with a feeding hole and a discharging hole 9, the discharging hole is provided with a scraping plate 18 and a reverse helical blade 19, and the discharging hole 9 is provided with a discharging hole connecting end 8.

The working principle of the powder conveying and metering device of the invention is described in detail below with reference to fig. 1 and 2:

when the powder conveying and metering device receives a system feeding signal, the loosening motor 12 and the feeding motor 3 are synchronously started to start working.

During the operation of the loosening and filling device 13, the rotation direction of the loosening blade 14 is opposite to the rotation direction of the feeding screw 17. The loosening motor 12 drives the loosening blades 14 to rotate, powder entering the powder conveying and metering device is scattered, and the loosening blades 14 distributed at different angles push and spread the powder gathered at the upper part along the axial direction. When the falling flow of powder in the upper storage bin is changed or the blanking is interrupted for a short time, the powder conveying and metering device can be ensured to temporarily store the powder to be full of the feeding hole of the feeding screw 17, and the filling coefficient of the material in the feeding screw 17 is ensured to be stable.

The feeding motor 3 drives the feeding screw 17 to rotate to push the powder to advance. According to the characteristics of the powder, the clearance between the diameter of the feeding screw and the inner diameter of the shell is 2mm, the powder at the feeding hole moves forwards along the bottom of the conveyor, when the powder reaches the discharging hole 9, the scraper 18 scrapes the whole powder, the reverse helical blade 19 conveys the powder at the rear end of the discharging hole to the discharging hole 9, and the powder falls and is output. The powder material conveyed by the feeding screw 17 is completely output, so that the consistency of feeding and discharging is ensured.

The pitch design of the feeding screw 17 fully considers the characteristics of mass flow, density, mesh number and the like of conveyed materials, and in order to achieve the feeding quality precision of not less than +/-1%, the pitch of the feeding port is controlled to be 4mm-55mm after verification for many times, and the pitch of the outlet can be properly adjusted according to the characteristics of the materials.

When the powder conveying and metering device receives a feeding stop signal of the system, the feeding motor 3 and the conveying motor 12 are stopped immediately, and the feeding screw 17 stops rotating. In order to avoid the precision error caused by the inertial motion of the powder, the rotating speed of the feeding motor 3 is limited to be not higher than 145 rpm.

When the powder material entering the feeding screw 17 is insufficient due to the shortage of the powder material in the upper bin, the falling flow change or the short-term interruption of the blanking, the level meter 6 arranged above the feeding screw 17 gives an alarm signal to stop the conveying of the dry powder material. The system can give a response in time, stop the transport of other ratio materials, guarantee the quality of final mixture.

The powder conveying and metering device is arranged at a position 1m³The method comprises the following steps of (1) filling the movable material chamber with powder (after a test, a conveying and metering test of different powder materials such as slag cement, composite portland cement and flour is completed), starting a powder conveying and metering device, setting the working frequency to be from 30Hz, 35Hz, 40Hz and 45Hz to 50Hz, setting the feeding time to be 1min, placing an empty barrel with known weight below a discharge port 9, automatically stopping the powder conveying and metering device after the set time is reached, weighing the weight of the barrel, recording and repeating for 3 times. The test result shows that: the powder conveying and metering device can realize the uniformity and stability of the powder conveying process under different frequencies, and the conveying quality error is not less than +/-1%, so the powder conveying and metering device can be widely applied to a movable grouting device for fixing medium and low-level waste.

It can be seen from the above detailed description of the embodiment of the present invention that, compared with the prior art, the powder conveying and metering device of the present invention has the loosening and filling device 13 disposed between the material chamber 1 and the feeding screw 17, the loosening blades 14 distributed at different angles on the loosening and filling device 13 push the gathered powder to spread out in the axial direction, when the falling flow rate of the powder in the material chamber 1 changes or the blanking is interrupted for a short time, the powder temporarily stored in the powder conveying and metering device can be ensured to fill the feeding hole of the feeding screw 17, so that the stacking density of the powder entering the feeding hole of the feeding screw 17 is consistent, the uniform and stable quality of the powder at any time period in the powder conveying process is realized, and the stable filling of the powder in the feeding screw 17 is ensured.

The present invention can be modified and adapted appropriately from the above-described embodiments, according to the principles described above. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.