CN107572198B

CN107572198B - Powder micro metering screw based on servo drive

Info

Publication number: CN107572198B
Application number: CN201710985246.2A
Authority: CN
Inventors: 黄少清; 余淡贤; 邓旭成
Original assignee: Foshan Golden Milky Way Intelligent Equipment Co Ltd
Current assignee: Foshan Golden Milky Way Intelligent Equipment Co Ltd
Priority date: 2017-10-20
Filing date: 2017-10-20
Publication date: 2023-07-28
Anticipated expiration: 2037-10-20
Also published as: CN107572198A

Abstract

The technical scheme of the powder micro metering screw based on servo driving provided by the embodiment of the invention comprises the following steps: a gear box, a stirring part and a conveying part; the gearbox comprises at least two output shafts; the stirring part comprises a stirring shaft and blades, and the blades are circumferentially arranged on the stirring shaft; the conveying component comprises screw barrels and screws arranged in the screw barrels, wherein the number of the screws is consistent with that of the output shafts, and the screws are connected with the output shafts in a one-to-one correspondence manner; the screw rod and the blade have a gap therebetween, and an included angle is formed between planes of the screw rod and the blade, and the included angle is larger than zero degrees.

Description

Powder micro metering screw based on servo drive

Technical Field

The embodiment of the invention relates to conveying equipment, in particular to a powder micro metering screw based on servo driving.

Background

At present, two types of metering devices mainly comprise a volumetric type metering device and a weight type metering device according to a metering principle for conveying and metering powder and granular materials; the two types of continuous metering are mainly classified into batch type and continuous type according to the continuity of conveying metering.

Meanwhile, the existing powder conveying and metering device has the problems of powder wall sticking, bridging, unstable conveying flow and the like, and the problems are more remarkable in micro conveying and metering application, so that the product quality is influenced.

Disclosure of Invention

In order to solve the technical problems, the embodiment of the invention provides a powder micro metering screw based on servo driving.

The technical scheme of the powder micro metering screw based on servo driving provided by the embodiment of the invention comprises the following steps:

a gear box, a stirring part and a conveying part;

the gearbox comprises at least two output shafts;

the stirring part comprises a stirring shaft and blades, and the blades are circumferentially arranged on the stirring shaft;

the conveying component comprises screw barrels and screws arranged in the screw barrels, wherein the number of the screws is consistent with that of the output shafts, and the screws are connected with the output shafts in a one-to-one correspondence manner;

the screw rod and the blade have a gap therebetween, and an included angle is formed between planes of the screw rod and the blade, and the included angle is larger than zero degrees.

Preferably, the device further comprises a driving component for driving the output shaft to rotate.

Preferably, the driving part comprises a servo motor and a speed reducer connected with the servo motor.

Preferably, the output shafts rotate in the same direction.

Preferably, the stirring shaft extends longitudinally in the up-down direction.

Preferably, the blades are uniformly arranged at the bottom circumference of the stirring shaft.

Preferably, the screw rod transversely extends along the horizontal direction, and the plane of the blade is perpendicular to the plane of the screw rod.

Preferably, the screws are engaged.

Preferably, the stirring device further comprises a stirring motor for driving the stirring shaft to rotate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of a powder micro metering screw based on servo drive according to an embodiment of the present invention;

fig. 2 is a top view of a blade and a screw of a powder micro-metering screw based on servo driving according to an embodiment of the present invention.

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.

Referring to fig. 1 to 2, the technical scheme of the powder micro metering screw based on servo driving according to the embodiment of the invention includes:

a driving part 1, a gear box 2, a stirring part 3, a conveying part 4 and a discharge hole part 5.

The driving part 1 comprises a servo motor and a speed reducer connected with the servo motor, wherein the servo motor, the speed reducer and an output shaft are sequentially connected, and the servo motor is used for driving the output shaft of the gear box 2 to rotate.

The gear box 2 comprises a box body and an input shaft arranged in the box body; at least two output shafts are further arranged in the box body, the output shafts of the gear box can be designed to rotate in the same direction or in different directions, and the output shafts are limited to rotate in the same direction based on the servo-driven powder micro metering screw rod.

The stirring member 3 includes a stirring shaft and blades provided on the stirring shaft, at least one of the blades being provided in number, and when the number of blades is two or more, the blades are provided along the circumference of the stirring shaft. As shown in fig. 2, the vane 31 is located above the screw 41 with a gap therebetween. Specifically, the stirring shaft longitudinally extends along the up-down direction, the blades 31 can be uniformly arranged at the bottom of the stirring shaft along the circumferential direction, the stirring motor drives the stirring shaft to rotate so as to drive the blades 31 to rotate to stir the raw materials, the stirring shaft has the advantages of compact structure, large moment, high transmission efficiency and convenience in operation, the blades 31 can be in a spiral twisted structure, the blades 31 have larger turbulent diffusion force and lower shearing force, the resistance when the blades 31 rotate to stir the raw materials is reduced, the stirring device is stable in operation, the noise is low, and the stirring raw materials are uniform.

The conveying part 4 comprises screw barrels and screws 41 arranged in the screw barrels, wherein the number of the screws 41 is consistent with that of the output shafts, and the screws are connected with the output shafts in a one-to-one correspondence manner. In this embodiment, the plurality of screws may be engaged with each other.

According to a screw conveying amount metering formula v=f×h×n×ε×η, wherein V is the conveying amount, F is the free volume, H is the screw lead, n is the screw rotation speed, ε is the filling efficiency, η is the conveying efficiency.

As can be seen from the formula, F, H and n are required to be reduced when the micro powder is conveyed on the premise that epsilon and eta are stable, wherein F and H are the shape parameters of the conveying screw, and too small F and H bring difficulty to processing and increase of processing cost; the rotation speed n is determined by the motor and the intermediate transmission member, but the speed of the common motor is easy to drift at a low speed, and the rotation speed is unstable, so that the conveying flow is fluctuated, and the technical problem is solved by arranging the servo motor in the embodiment.

After F, H and n stabilize, ε and η become the main factors affecting the stability of delivery. The eta conveying efficiency is mainly determined by the conveyed materials and the structure of the screw, under the condition of single screw conveying or non-meshed screw conveying, the materials are easy to adhere and accumulate at the groove part of the screw, and the adhesion layer is peeled off after a certain amount of the materials reach, so that the conveying efficiency is high and low, and the metering precision is influenced. Therefore, the screw rods are mutually meshed, and the self-cleaning function is realized when the screw rods rotate, so that the problem of flow fluctuation in the conveying process is fundamentally solved. In another aspect, the conveying stability is based on the premise of stable feeding, and is represented by the stability of the feeding rate of a feeding hole in the device, and the stability of epsilon filling efficiency is understood in principle. Approximately, the cause of the flow fluctuation of the feed is similar to the cause of the flow fluctuation in the conveying process. In the past equipment of the same type, in order to solve the bridging problem of the feed inlet, a lateral stirring paddle is added, but the lateral stirring paddle has a stirring blind area, and the bridging risk still exists at the positions around the feed inlet. In the embodiment, the spiral plane stirring paddle is adopted, the gap between the bottom of the paddle and the conveying screw is extremely small, the section of the whole feeding hole can be swept, and a stirring blind area does not exist, so that the problem of bridging of the feeding hole is solved.

While the invention has been described in detail and with reference to specific embodiments thereof, those skilled in the art will appreciate that the invention is not limited to such embodiments.

Claims

1. A powder micro metering screw based on servo drive, which is characterized by comprising: a gear box, a stirring part, a driving part and a conveying part;

the gearbox comprises at least two output shafts;

the stirring part comprises a stirring shaft and blades, the blades are circumferentially arranged on the stirring shaft, the stirring shaft longitudinally extends along the up-down direction, the blades are circumferentially and uniformly arranged at the bottom of the stirring shaft, and the blades are of a spiral twisted structure;

a gap is formed between the screw and the blade, an included angle is formed in a plane where the screw and the blade are located, the included angle is larger than zero degree, and the blade is eccentrically arranged relative to the screw;

the driving part is used for driving the output shaft to rotate, and comprises a servo motor and a speed reducer connected with the servo motor.

2. The servo-drive based powder micro-metering screw of claim 1, wherein the output shaft rotates in the same direction.

3. The servo-driven powder micro-metering screw as claimed in claim 1, wherein the screw extends transversely in a horizontal direction, and the plane of the blade is perpendicular to the plane of the screw.

4. The servo-driven powder micro-metering screw of claim 1, wherein the screws are meshed.

5. The servo-drive based powder micro-metering screw of claim 1, further comprising a stirring motor for driving the stirring shaft to rotate.