A micro-precision dosing system and method

Abstract

The application relates to the technical field of batching, in particular to a micro precise feeding system and method. The micro precise feeding system comprises a storage bin for temporarily storing materials; a material carrying disc arranged below an outlet of the storage bin and used for receiving and transporting materials falling from the outlet of the storage bin, wherein the falling direction of the materials is parallel to the disc surface of the material carrying disc; a driving motor used for driving the material carrying disc to rotate; a micro negative pressure extractor fixed to one side of the material carrying disc away from the storage bin and provided with an inlet and an outlet, wherein the inlet of the micro negative pressure extractor is used for receiving and sucking the materials on the side wall of the material carrying disc, and the outlet of the micro negative pressure extractor is used for discharging the materials to realize feeding; and a controller used for controlling the start-stop and rotating speed of the driving motor. The system can improve the accuracy of micro feeding of powder and granular materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batching, in particular to a micro precise feeding system and a micro precise feeding method. BACKGROUND

[0002] Dust refers to fine solid particulate matter dispersed in gas. Since dust is usually an environmental pollutant in the environment, it is necessary to test and study dust in terms of particle concentration and particle size. The research of colleges and research institutions requires a micro particulate matter adding system, i.e., a precise feeding system capable of achieving a feeding amount of 1-10 g / h per hour. In addition, the trace powder quantitative addition is also required for the traceability of particulate matter measuring equipment for monitoring atmospheric particulate pollutants and instrument calibration, so as to verify the accuracy and precision of the system.

[0003] In industrial production, some expensive micro powders are usually added as reactants, initiators, and aids. Micro fine powder or ultrafine powder needs to be uniformly added or mixed into a large amount of bulk material phase system. Precise metering and addition of these special powders has always been a problem in industry, such as uniform dispersion and metering of micro adsorbents in a large space. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a micro precise feeding system and method to improve the accuracy of micro feeding of powder particulate material.

[0005] To achieve the above purpose, the first aspect of the present application provides a micro precise feeding system for precisely controlling the discharge amount of powder particulate material, the micro precise feeding system comprising: a storage bin for temporarily storing material; a material carrying disc arranged below the outlet of the storage bin for receiving the material falling from the outlet of the storage bin and transporting the material, wherein the direction of the falling material is parallel to the disc surface of the material carrying disc; a driving motor for driving the material carrying disc to rotate; a micro negative pressure extractor fixed to one side of the material carrying disc away from the storage bin, the micro negative pressure extractor being provided with an inlet and an outlet, wherein the inlet of the micro negative pressure extractor is used to receive and extract the material on the side wall of the material carrying disc, and the outlet of the micro negative pressure extractor is used to discharge the material to realize feeding; and a controller for controlling the start-stop and rotating speed of the driving motor.

[0006] Based on the first aspect, in some embodiments of the present application, the micro precise feeding system further comprises a vibration member abutting against the storage bin and a vibration driver for driving the vibration member to vibrate, the vibration driver being connected with the controller, and the controller is further used to control the start-stop and driving frequency of the vibration driver.

[0007] Based on the first aspect, in some embodiments of this application, the micro-precision feeding system further includes: a mobile power supply for powering the drive motor, the micro-negative pressure extractor, the vibration driver, and the controller; and a housing for accommodating the storage bin, the loading tray, the drive motor, the micro-negative pressure extractor, the controller, the vibrating element, the vibration driver, and the mobile power supply.

[0008] Based on the first aspect, in some embodiments of this application, the material carrier is a disc structure with a preset thickness.

[0009] Based on the first aspect, in some embodiments of this application, the sidewall of the material carrier is provided with a receiving groove of a preset depth and a preset width along the circumferential direction.

[0010] Based on the first aspect, in some embodiments of this application, the horizontal distance between the outlet of the storage bin and the center of the loading tray is α, where α∈(0, 1 / 3R], and R represents the radius of the loading tray.

[0011] Based on the first aspect, in some embodiments of this application, the micro-precision feeding system further includes: a collection device, detachably connected to the outlet of the micro negative pressure extractor, for collecting the material drawn up by the micro negative pressure extractor.

[0012] Secondly, this application provides a micro-precision feeding method applicable to the aforementioned micro-precision feeding system. The method is characterized by comprising: fitting the rotational speed of the material carrier and the feeding amount of the micro-negative pressure extractor, and plotting a rotational speed-feeding amount correlation curve; and controlling the feeding amount of the feeding system by controlling the rotational speed of the material carrier driven by the drive motor based on the rotational speed-feeding amount correlation curve.

[0013] Based on the second aspect, in some embodiments of this application, the collecting device is a filter, and the filter includes a filter element; the process of fitting the rotational speed of the loading disc and the feeding amount of the micro-negative pressure extractor to plot the rotational speed-feeding amount correlation curve includes: S1, selecting a suitable filter element according to the particle size of the material; S2, weighing the mass m1 of the filter element and installing the filter at the outlet of the micro-negative pressure extractor; S3, setting the rotational speed V of the drive motor and stopping the micro-precision feeding system after a preset time; S4, removing the filter element and weighing the mass m2 of the filter element again, and calculating (m2-m1); S5, changing the rotational speed V of the drive motor and repeating S2 to S4, while keeping the preset time consistent for each repetition; S6, establishing a coordinate system of rotational speed-feeding amount, marking the coordinate points (V, m2-m1) in the coordinate system, and connecting the coordinate points to obtain the rotational speed-feeding amount correlation curve.

[0014] In the second aspect, in some embodiments of the present application, before fitting the rotation speed of the carrier tray and the feeding amount of the micro-negative pressure extractor, the method further comprises: obtaining the target feeding amount per unit time; and selecting a carrier tray with a suitable specification according to the target feeding amount and a preset rule to install.

[0015] The present application has at least the following advantages:

[0016] In the present application, the material is transported by the narrow side wall of the carrier tray, so that the carrier tray can only transport a small amount of material at a time, ensuring the accuracy of material metering. Then, by replacing carrier trays of different specifications and thicknesses, different feeding amount requirements can be met. Further, by adjusting the driving motor with the controller, the rotation speed of the carrier tray can be controlled to achieve control of different micro-feeding ranges, such as accurate control of the milligram, gram, and kilogram per hour feeding range.

[0017] Other features and advantages of the embodiments of the present application will be described in detail in the following specific implementation part. DETAILED DESCRIPTION

[0018] The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used together with the following specific implementation to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the drawings:

[0019] Figure 1 The structure of the micro-precision feeding system of an embodiment of the present application is schematically shown;

[0020] Figure 2 The local position of the micro-precision feeding system of an embodiment of the present application is schematically shown;

[0021] Figure 3 The local structure connection of the micro-precision feeding system of an embodiment of the present application is schematically shown;

[0022] Figure 4 The plane connection of the micro-precision feeding system of an embodiment of the present application is schematically shown;

[0023] Figure 5 The position relationship between the material falling point and the material extracting point of an embodiment of the present application is schematically shown;

[0024] Figure 6 The side wall of the carrier tray of different thicknesses without a containing groove of an embodiment of the present application is schematically shown;

[0025] Figure 7 The side wall of the carrier tray of different thicknesses with a containing groove of an embodiment of the present application is schematically shown;

[0026] Figure 8 A rotational speed-feed amount correlation curve of an embodiment of the present application is schematically shown.

[0027] Reference Signs List

[0028] 1-Storage bin; 101-Conical bin; 102-Conveying pipe; 2-Load carrier; 3-Drive motor; 4-Micro-negative pressure sucker; 5-Vibration member; 6-Vibration driver; 7-Mobile power supply; 8-Motor driver; 9-Drop box; 10-Touch display screen; 11-Collection device; 12-Shell; 13-Return device; 131-Return driving device. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be understood that the specific embodiments described herein are merely used to explain and illustrate the embodiments of the present application, and should not be used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0030] The scope of protection of the present application.

[0031] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0032] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those of ordinary skill in the art, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope claimed by the present application.

[0033] Embodiment 1

[0034] As Figure 1As shown, this embodiment provides a micro-precision feeding system for precisely controlling the output of powder and granular materials. The micro-precision feeding system includes: a storage bin 1 for temporarily storing materials; a loading tray 2 located below the outlet of the storage bin 1 for receiving and transporting materials falling from the outlet of the storage bin 1, wherein the direction of material falling is parallel to the surface of the loading tray 2; a drive motor 3 for driving the loading tray 2 to rotate; a micro-negative pressure extractor 4 fixed above the loading tray 2 on the side away from the storage bin 1, wherein the micro-negative pressure extractor 4 has an inlet and an outlet, wherein the inlet of the micro-negative pressure extractor 4 is used to receive and extract materials on the side wall of the loading tray 2, and the outlet of the micro-negative pressure extractor 4 is used to discharge materials to achieve feeding; and a controller for controlling the start, stop, and speed of the drive motor 3.

[0035] Specifically, the storage silo 1 includes a conical silo 101 and a guide pipe 102, wherein one end of the guide pipe 102 is connected to the outlet of the conical silo 101, and the other end of the guide pipe 102 is located above the loading tray 2. Preferably, the end of the guide pipe 102 connected to the conical silo 101 is higher than the end located above the loading tray 2, that is, the guide pipe 102 is inclined, which facilitates the material falling. The outlet of the guide pipe 102...

[0036] The horizontal distance between the outlet of storage bin 1 and the center of loading tray 2 is α, where α∈(0, 1 / 3R], and R represents the radius of loading tray 2 (e.g., ...). Figure 2 (as shown), to ensure that the material can fall onto the side wall of the material tray 2 while avoiding material adhering to the tray surface and the tray shaft of the material tray 2.

[0037] Preferably, the line connecting the material drop point on the material tray 2 and the center of the material tray 2 is the first line, and the line connecting the material suction point on the material tray 2 and the center of the material tray 2 is the second line. The angle between the first line and the second line is β. The material drop point and the material suction point are symmetrical, with the axis of symmetry being a vertical line passing through the center of the material tray 2. β has a value range of 90°≤β≤120°. The material drop point refers to the position on the material tray 2 directly below the outlet of the storage hopper 1. The material suction point refers to the position on the material tray 2 where the material is most easily sucked away by the micro-negative pressure suction device 4. Figure 5 As shown, the material drop point and the material collection point should be arranged in the above-mentioned material drop area and material collection area respectively. The value range of the central angle β is as above. If it is less than 90°, negative pressure will occur and suction will occur. If it is greater than 120°, material leakage is likely. If it exceeds the above range, it will affect the material loading and storage uniformity of the material tray 2.

[0038] Specifically, the material tray 2 is typically disc-shaped and can be made of metal or smooth-surfaced plastic, etc. This embodiment mainly includes two types, distinguished by whether or not a receiving groove is provided on the side wall of the material tray 2: one with a receiving groove and one without (e.g., ...). Figure 6 and Figure 7As shown, Figure 6 Schematic diagram of different thickness of the side wall of the carrier tray without accommodating groove; Figure 7 Schematic diagram of different thickness of the side wall of the carrier tray with accommodating groove). For example, for the requirement of milligram level per hour feeding, the carrier tray 2 without accommodating groove is required to be used, and the thickness of the carrier tray 2 also needs to be controlled in a relatively thin range; while for the requirement of gram level per hour feeding, the carrier tray 2 with accommodating groove can be used, and the thickness of the carrier tray 2 (i.e. the width of the side wall) is increased to increase the single feeding amount of the carrier tray 2.

[0039] Specifically, the driving motor 3 is connected with the central shaft of the carrier tray 2, and the rotation speed of the carrier tray 2 can be controlled by controlling the rotation speed of the driving motor 3. The rotation speed of the carrier tray 2 is closely related to the feeding amount of the system per unit time, which will be described in detail in Example 2.

[0040] Specifically, the micro negative pressure extractor 4 can be an air compressor or other equipment capable of generating negative pressure. The micro negative pressure extractor 4 needs to be synchronized with the start of the driving motor 3 to prevent the material transported by the carrier tray 2 from being unable to be timely extracted. In addition, compared with allowing the material on the carrier tray 2 to naturally fall off and then collecting the material as the feeding amount, the use of the micro negative pressure extractor 4 to absorb the material in this embodiment not only can save the feeding time, but also can avoid the fine powder particles from being adsorbed on the side wall of the carrier tray 2 to cause the feeding amount to be inaccurate. The micro negative pressure extractor 4 sucks the material on the surface of the side wall of the carrier tray 2 and discharges it outward through air carrying, realizing the whole process of feeding of the fine particle powder.

[0041] Further, the micro precise feeding system further comprises a vibrating member 5 abutting against the storage bin 1 and a vibration driver 6 for driving the vibrating member 5 to vibrate, the vibration driver 6 being connected with the controller, and the controller being further used for controlling the start-stop and driving frequency (i.e. the frequency of driving the vibrating member 5 to vibrate) of the vibration driver 6. Specifically, the micro vibration frequency range of the vibration driver 6 can be adjusted and controlled according to the particle characteristics such as the bulk density, density and force of the material, so that the material in the storage bin 1 is in a critical boiling non-dust raising state.

[0042] As shown, Figure 1 The vibrating member 5 can be fixed below the storage bin 1, and the vibration driver 6 can be fixed near the vibrating member 5 to drive the vibrating member 5 to continuously vibrate. By controlling the amplitude of the vibrating member 5, the fine particle powder material can be stably dropped from the conical bin 101 and stably transported in the material guide pipe 102, preventing the material from being hardened and ensuring smooth and uniform feeding.

[0043] Further, the micro-precision dosing system further comprises a mobile power supply 7 for powering the driving motor 3, the micro-negative pressure extractor 4, the vibration driver 6 and the controller; and a shell 12 for accommodating the material storage bin 1, the material carrying disc 2, the driving motor 3, the micro-negative pressure extractor 4, the controller, the vibration piece 5, the vibration driver 6 and the mobile power supply 7. In this way, the device can be conveniently moved and carried, and the convenience of use is improved. Since the mobile power supply 7 is usually a constant direct current source, if the driving motor 3 needs to change the rotating speed, a motor driver 8 (for example, a frequency converter) also needs to be connected, as shown in Figure 1

[0044] Further, after the material falls from the outlet of the guide pipe 102, it does not necessarily all fall onto the side wall of the material carrying disc 2, and there is also a loss (the material slides off the material carrying disc 2) during the conveying process of the material carrying disc 2. Therefore, in order to avoid the material from spilling, a material falling box 9 is further arranged below the material carrying disc 2 to collect the falling material. The material falling box 9 is also arranged in the shell 12. Preferably, in the embodiment, the device further comprises a material returning device 13, the inlet end of the material returning device 13 is connected with the outlet end of the material falling box 9, and the outlet end of the material returning device 13 is arranged above the material storage bin 1. The material returning device 13 is used to convey the material in the material falling box 9 back into the material storage bin 1. The material returning device 13 can be a spiral material returning device 13, which is driven by a material returning driving device 131. Specifically, the spiral material returning device 13 is composed of an easily elastic vibrating spiral spring wire, a rotating penetrating rod and a sealing cylinder, and is made of corrosion-resistant and wear-resistant alloy or modified plastic. The spiral spring wire is penetrated on the rotating penetrating rod, is fixed on the center line of the cylinder, and is engaged with the driving gear at the end of the rotating penetrating rod, which is driven by the micro motor driving engagement gear set.

[0045] Further, the system further comprises a touch display screen 10 connected with the controller, which is used to receive control instructions and display and set parameters of the system, including the driving frequency of the vibration driver 6, the material attribute, the rotating speed of the driving motor 3, etc.

[0046] Embodiment 2

[0047] In the case that the material carrying disc 2 and the material do not change, the amount of the dosing material is mainly related to the rotating speed of the material carrying disc 2. In order to ensure the accuracy of the dosing amount, the relationship between the rotating speed of the material carrying disc 2 and the dosing amount of the micro-negative pressure extractor 4 needs to be obtained in advance. That is, the rotating speed of the material carrying disc 2 and the dosing amount of the micro-negative pressure extractor 4 are fitted, and a rotating speed-dosing amount correlation curve is drawn, which specifically includes:

[0048] First, a collecting device 11 (for example, a funnel) is connected at the outlet of the micro-negative pressure extractor 4. Figure 3 ​The filter is used to filter the material particles sucked by the micro negative pressure extractor 4, and then the clean air is discharged through the outlet of the filter. The filter core pores are determined according to the particle size of the powder used, and the filter core material can be polypropylene, polytetrafluoroethylene, nylon, polyether sulfone, etc. Then the rotation speed-feeding amount correlation curve is obtained by the following method:

[0049] S1, selecting a suitable filter core according to the particle size of the material;

[0050] S2, weighing the mass m1 of the filter core, and installing the filter at the outlet of the micro negative pressure extractor 4;

[0051] S3, setting the rotation speed V of the driving motor 3, and stopping the micro precise feeding system after a predetermined time;

[0052] S4, after removing the filter core of the filter, weighing the mass m2 of the filter core again, and calculating (m2-m1);

[0053] S5, changing the rotation speed V of the driving motor 3, repeating S2-S4, and keeping the predetermined time consistent each time (a new filter or a new filter core is needed each time);

[0054] S6, establishing a rotation speed-feeding amount coordinate system, and marking the coordinate points (V, m2-m1) in the coordinate system (experimental calibration values in Figure 8 ), and connecting the coordinate points to obtain the rotation speed (speed gear)-feeding amount correlation curve (fitting curve in Figure 8 ).

[0055] Finally, based on the rotation speed-feeding amount correlation curve, the rotation speed of the driving motor 3 driving the material loading disc 2 is controlled to control the feeding amount of the feeding system.

[0056] Specifically, the outlet of the micro negative pressure extractor 4 can adopt the connecting structure in Figure 4 , the outlet of the micro negative pressure extractor 4 is connected with two paths, one is used for normal use and discharge, and the other is used for quantitative detection or calibration, and a switch valve is arranged on each path (which can be connected with the controller) to control the on-off of the path. Users can choose the working mode of the system (calibration mode or running mode) by themselves.

[0057] It should also be noted that the terms "comprising", "comprises" or other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0058] The above embodiments are only used to illustrate the present application, but not to limit it. Instead of the above, various modifications and changes can be made to the application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall fall into the scope of the claims of the application.

Claims

1. A micro-precision feeding system for precisely controlling the discharge rate of powder and granular materials, characterized in that, The micro-precision feeding system includes: Storage bin (1), used for temporary storage of materials; The material loading tray (2) is located below the outlet of the storage bin (1) and is used to receive materials falling from the outlet of the storage bin (1) and to transport materials. The direction of the falling material is parallel to the surface of the material loading tray (2). A drive motor (3) is used to drive the material tray (2) to rotate; The micro negative pressure extractor (4) is fixed on the side of the material tray (2) away from the storage bin (1). The micro negative pressure extractor (4) is provided with an inlet and an outlet. The inlet of the micro negative pressure extractor (4) is used to receive and extract the material on the side wall of the material tray (2), and the outlet of the micro negative pressure extractor (4) is used to discharge the material to realize feeding. The horizontal distance between the outlet of the storage bin (1) and the center of the loading tray (2) is α, where α∈(0, 1 / 3R], R represents the radius of the loading tray (2). The line connecting the point on the loading tray (2) directly below the outlet of the storage bin (1) and the center of the loading tray (2) is the first line. The line connecting the point on the loading tray (2) where the material is most easily sucked away by the micro negative pressure extractor (4) and the center of the loading tray (2) is the second line. The angle between the first line and the second line is β, 90°≤β≤120°. The outlet of the micro negative pressure extractor (4) is connected to a first passage and a second passage. Both the first passage and the second passage are equipped with shut-off valves for controlling the on / off state. The first passage is used for normal feeding, and the second passage is equipped with a detachable collection device (11). The collection device (11) is used to collect the material sucked by the micro negative pressure extractor (4) and to plot the speed-feeding quantity correlation curve by fitting the mass of the material sucked by the micro negative pressure extractor (4) and the rotational speed of the loading plate (2). The controller is used to control the rotational speed of the loading plate (2) by the drive motor (3) based on the speed-feeding quantity correlation curve.

2. The micro-precision feeding system according to claim 1, characterized in that, The micro-precision feeding system also includes a vibrating element (5) that abuts against the storage bin (1) and a vibration driver (6) for driving the vibrating element (5) to vibrate. The vibration driver (6) is connected to a controller, which is also used to control the start and stop of the vibration driver (6) and the driving frequency.

3. The micro-precision feeding system according to claim 2, characterized in that, The micro-precision feeding system also includes: A mobile power supply (7) is used to power the drive motor (3), the micro negative pressure extractor (4), the vibration driver (6), and the controller; The outer casing (12) is used to house the storage bin (1), the loading tray (2), the drive motor (3), the micro negative pressure extractor (4), the controller, the vibrating component (5), the vibration driver (6), and the mobile power supply (7).

4. The micro-precision feeding system according to claim 1, characterized in that, The material carrier (2) is a disc structure with a preset thickness.

5. The micro-precision feeding system according to claim 4, characterized in that, The side wall of the material tray (2) is provided with a receiving groove of preset depth and preset width along the circumferential direction.

6. A micro-precision feeding method, applicable to the micro-precision feeding system according to any one of claims 1-5, characterized in that, The collecting device (11) is a filter, the filter including a filter element; the method includes: S1. Select the appropriate filter element according to the particle size of the material; S2. Weigh the filter element to a mass m1 and install the filter at the outlet of the micro negative pressure extractor (4); S3. Set the speed V of the drive motor (3) and let the micro-precision feeding system stop after running for a preset time; S4. After removing the filter element, weigh the filter element again (m2) and calculate (m2-m1). S5. Change the speed V of the drive motor (3), repeat S2~S4, and keep the preset time consistent for each repetition. S6. Establish a coordinate system of rotation speed and feed rate, and mark the coordinate points (V, m2-m1) in the coordinate system. Connect the coordinate points to obtain the correlation curve of rotation speed and feed rate.

7. The micro-precision feeding method according to claim 6, characterized in that, The method further includes: Obtain the target feed rate per unit time; Select the appropriate material tray (2) according to the target feed rate and preset rules and install it.

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