A precise quantitative feeder

Abstract

A precise quantitative feeder is provided, wherein a roller device is arranged on one side of a feed inlet of a casing, and the roller device comprises an arc groove and a roller rotatably arranged in the arc groove, and both ends of the roller are inserted into bearing seats correspondingly arranged at both ends of the casing, and the arc groove is arranged on the feed inlet side, one end is connected to the side wall of the feed inlet, and the other end is connected to the cylindrical outer wall of the casing, and the gap between the outer circle contour line of the roller and the outer circle contour line of the groove wheel is within 0.05mm, and the roller rolling ensures that powders with a particle size entering the groove larger than the gap between the outer circle of the groove wheel and the inner wall of the casing will not enter the space between the outer circle of the groove wheel and the inner wall of the casing, so that the raw material particles will not be broken during feeding or unloading; at the same time, powders with large particle size will not be sandwiched between the outer edge of the groove wheel and the inner wall of the casing, and wearing parts are eliminated, and the service life of the equipment is doubled.

Description

Technical Field

[0001] The invention belongs to the technical field of powder processing, and in particular relates to a precise quantitative feeder, which is suitable for quantitative feeding of powder processing equipment in the powder processing industry. Background Art

[0002] In the industry, solid particles ranging from tens of millimeters to micrometers and nanometers are called powders. In the powder processing production line, feeding raw materials to the processing equipment is called feeding; receiving and discharging finished products and semi-finished products produced by powder processing is called unloading. The existing wind shelter is a relatively sealed unloader. The gap between the outer circle of its groove wheel and the inner hole of the casing is no more than 0.06mm. The use of wind shelter unloading can complete the unloading task while ensuring that the working airflow in the production line before the wind shelter feed port will not leak out with the powder. This is one of the most basic and important technical requirements of the powder processing production line. Therefore, all wind shelters must maintain a minimum gap for a long time during use to ensure that there is no air leakage. Because the powder in the wind shelter groove wheel that protrudes beyond the outer edge of the groove wheel may be sandwiched between the groove wheel partition and the end face of the inner wall of the casing and be crushed and squeezed between the outer edge of the partition and the inner wall of the casing, forming a strong friction effect on both, causing the groove wheel and the inner wall of the casing to wear rapidly, the existing wind shelter must never be used for feeding, and when purchasing and using the wind shelter for unloading, it must be ensured that the powder cannot fill the groove wheel when the wind shelter is running.

[0003] The existing quantitative feeders include volumetric type, such as the volumetric wheat dispenser in the wheat milling industry; gravity type, such as the gravity wheat dispenser in the wheat milling industry; electronic type and variable frequency spiral feeder and other structural forms.

[0004] Among them, the advantages of volumetric wheat dispensers are simple structure and low cost; the disadvantages are that the structure and operation method of controlling the flow rate by manually pulling the plug plate on site are too backward, out of touch with market demand and low quantitative accuracy (the ±2% measured data recorded in the manual is often greatly exceeded). The above two major shortcomings have caused volumetric wheat dispensers to gradually withdraw from the market.

[0005] The advantages of variable frequency screw feeder are simple structure, low cost and sealing; the disadvantages are high power consumption, large component wear, low production capacity and large quantitative error. Since the feeding filling factor of the screw feeder is 0.8-0.9 (the larger the speed is, the larger the conveying flow rate is), and the equipment structure and working principle determine that there must be a certain gap between the outer edge of the spiral and the inner wall of the casing tube (a small amount of powder cannot move synchronously with the majority of powder during the operation of the spiral, resulting in a decrease in the conveying flow rate), the quantitative error of the variable frequency screw feeder is much lower than that of the volumetric wheat dispenser. This fatal defect greatly limits the application scope of the variable frequency screw feeder.

[0006] The advantages of gravity-type wheat dispenser and electronic flow controller are that they can be electrically remotely controlled and are suitable for automated production lines; the disadvantages are complex structure, high cost (a gravity-type wheat dispenser costs 10,000 to 30,000 yuan), complicated operation and maintenance, and high repair costs. The biggest drawback of the above two devices as quantitative feeders is that the quantitative error is large. This is because both rely on pneumatic control to open the gate size to control the powder flow.

[0007] The product manual of the gravity wheat dispenser states that the control accuracy (should be the quantitative error) of the two specifications of the gravity wheat dispenser is ±1%. However, according to the equipment structure and working principle, under the premise of constant gate opening size, the differences and changes in physical characteristics such as material level height in the silo or hopper, powder particle size, particle size distribution, powder density, composition and shape directly affect the flow rate and flow of the powder. For continuous fluids, the quantitative error caused by any of the above factors may far exceed 1%. Moreover, even if the quantitative error is not greater than 1%, it cannot meet the needs of most industries.

[0008] In summary, the lack of a cost-effective, reliable, and accurate quantitative feeder is a major shortcoming of existing powder processing technology. Summary of the invention

[0009] The purpose of the present invention is to provide a precise quantitative feeder to improve the service life and quantitative accuracy in view of the above-mentioned deficiencies in the prior art.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: A precise quantitative feeder comprises a cylindrical casing and a groove wheel arranged in the inner cavity of the casing, and a feed port and a discharge port are provided on the casing, the feed port is provided at the upper end of the cylindrical structure, and the discharge port is provided at the lower end of the cylindrical structure; a plurality of partitions are provided in the groove wheel at intervals along the radial direction to divide the groove wheel into a plurality of troughs for receiving materials, and a roller device is also provided on the casing at one side of the feed port; The roller device comprises an arc-shaped groove and a roller rotatably arranged in the arc-shaped groove, and the two ends of the roller are inserted into the bearing seats correspondingly arranged at the two ends of the housing; The arc groove is arranged on the feed port side, one end of which is connected to the side wall of the feed port, and the other end is connected to the cylindrical outer wall of the casing, and the gap between the outer circular contour line of the rolling roller and the outer circular contour line of the groove wheel is within 0.05mm.

[0011] The outer end surface of the rolling roller is set as a serrated surface.

[0012] The roller device is arranged on the rotation forward side of the groove wheel.

[0013] The gap between the outer circle of the groove wheel and the inner wall of the casing is not greater than 0.02mm.

[0014] The rotation speed of the groove wheel is controlled by a frequency converter.

[0015] The bearing seats at both ends of the casing are provided with rolling bearings for supporting the shaft heads at both ends of the rolling roller.

[0016] The beneficial effects of the present invention are: (1) The present invention discloses a precise quantitative feeder, wherein a roller device is arranged on one side of a feed inlet of a casing, and the roller device comprises an arc groove and a roller rotatably arranged in the arc groove, and both ends of the roller are inserted into bearing seats correspondingly arranged at both ends of the casing, and the arc groove is arranged on the feed inlet side, one end is connected to the side wall of the feed inlet, and the other end is connected to the cylindrical outer wall of the casing, and the gap between the outer circle contour line of the roller and the outer circle contour line of the groove wheel is within 0.05 mm, and the roller rolling ensures that the powder whose particle size entering the groove is larger than the gap between the outer circle of the groove wheel and the inner wall of the casing will not enter the space between the outer circle of the groove wheel and the inner wall of the casing, so that the raw material particles will not be broken during feeding or unloading; at the same time, the powder with a large particle size will not be sandwiched between the outer edge of the groove wheel and the inner wall of the casing, and the wearing parts are eliminated, and the service life of the equipment is doubled.

[0017] (2) Each wheel groove on the groove wheel of the present invention is a volumetric measuring instrument, and the rollers spaced apart from the wheel grooves are scrapers. When the groove wheel rotates, the rollers scrape the powder in the wheel grooves and the powder follows the groove wheel in and out of the closed space between the groove wheel and the casing. During the whole process, no leakage occurs, so it is a rotating precise measuring instrument.

[0018] (3) The present invention is suitable for conveying almost all powders with particle sizes within the powder definition range except for powders with high viscosity, and the production capacity can be large or small to easily meet the needs of various production lines. It only requires changing the equipment specifications and the steel plate groove wheel structure size design, and has a very wide range of applications.

[0019] (4) The present invention has a small size, light weight, light operating load, and variable frequency speed regulation. Compared with the prior art, the power saving rate for conveying the same amount of powder is at least 30% to 60%, and the energy saving effect is excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional view of the present invention. DETAILED DESCRIPTION

[0021] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] The present invention provides a precise quantitative feeder, such as Figure 1 and Figure 2 shown.

[0023] A precise quantitative feeder comprises a cylindrical casing 3 and a groove wheel 9 arranged in the inner cavity of the casing, and the casing 3 is provided with a feed port 2 and a discharge port 12, the feed port 2 is opened at the upper end of the cylindrical structure, and the discharge port 12 is opened at the lower end of the cylindrical structure; a plurality of partitions are radially spaced in the groove wheel 9 and divide the groove wheel into a plurality of troughs for receiving materials, and a roller device is also provided on the casing 3 at one side of the feed port.

[0024] 1. The roller device comprises an arc groove and a roller 8 rotatably arranged in the arc groove, and the two ends of the roller 8 are inserted into the bearing seats 5 correspondingly arranged at the two ends of the housing, and the arc groove is arranged on the feed inlet side, one end is connected to the side wall of the feed inlet, and the other end is connected to the cylindrical outer wall of the housing 3, and the gap between the outer circle contour line of the roller 8 and the outer circle contour line of the groove wheel 9 is within 0.05mm. The bearing seats 5 at both ends of the housing are equipped with rolling bearings for supporting the shaft heads at both ends of the roller.

[0025] In this embodiment, the roller device is arranged on the rotation forward side of the groove wheel 9, and the outer end surface of the roller 8 is set as a serrated surface.

[0026] The rotation speed of the groove wheel 9 is controlled by a frequency converter, and the gap between the outer circle of the groove wheel 9 and the inner wall of the casing is not greater than 0.02 mm. Therefore, the rolling of the roller 8 can ensure that all powders with a particle size greater than 0.02 mm entering the groove will not enter the space between the outer circle of the groove wheel and the inner wall of the casing. Therefore, the raw material particles will not be broken during feeding or unloading. At the same time, because powders with a particle size of more than 0.02 mm will not be sandwiched between the outer edge of the groove wheel and the inner wall of the casing 3, wearing parts are eliminated, and the service life of the equipment is also doubled.

[0027] The following is further described in conjunction with specific embodiments: A precise quantitative feeder comprises a housing 3, a groove wheel 9, a left end cover 10, a right end cover 4, a speed reducer 1, a frequency converter and a roller device. The upper and lower parts of the housing 3 are respectively provided with a feed port 2 and a discharge port 12 with a rectangular cross section. The lower end of the right side plate of the feed port 2 is connected to the radial end surface of the cylinder by a section of arc groove, and a space for accommodating a roller 8 is formed. The groove wheel 9 is provided with a plurality of partitions at intervals along the radial direction, and the groove wheel is divided into a plurality of fan-shaped troughs for receiving materials. The roller device on the housing at one side of the feed port comprises a roller 8 with shaft heads at both ends, two bearing boxes 5 and a bearing 6 installed in the bearing box. The outer cylindrical surface of the roller 8 is processed into a sawtooth groove. The roller 8 is installed on the upper right side of the groove wheel 9 in the housing. The bearing box 5 is installed on the left and right end plates of the housing. The two shaft heads of the roller 9 are supported by two rolling bearings 6 installed in the bearing box 5. The gap between the outer circle contour line of the roller 8 and the outer circle contour line of the groove wheel 9 should be within 0.05 mm.

[0028] The groove wheel 9 is installed in the casing 3, and the shaft heads at both ends of the groove wheel 9 are supported by bearings 6 installed in the left and right end covers at both ends of the casing. A bearing box is processed in the center of the left end cover 10 and the right end cover 4, and the bearing 6 is arranged in the bearing box; the roller device is installed at the upper right of the groove wheel in the casing, and the reducer 1 is installed on the right end cover 4. The input end of the inverter is connected to the power supply, and the output end is connected to the motor of the reducer 1.

[0029] During operation, the powder falling from the silo or hopper above the feed port of the casing must ensure that all the slots of the groove wheel are always filled. The powder falling into any groove of the wheel moves with the groove wheel. The moment the steel plate on the right side of the groove passes over the right side plate of the discharge port, the powder begins to fall. Before the partition plate on the left side of the groove reaches the left side plate of the discharge port, all the powder in the groove must fall into the discharge port one after another and be discharged. When the groove wheel rotates one circle, the groove transports all the powder received from the feed port to the discharge port.

[0030] During the operation of the groove wheel, the powder that is higher than the outer circle of the groove wheel will inevitably touch the outer circle serrated groove of the roller (because the gap between the outer circle contour of the roller and the outer circle contour of the groove wheel is less than 0.05mm), and push the roller to rotate (the rolling bearings at both ends of the roller ensure that a small thrust can push the roller to rotate). The rotation of the roller rolls all the powders in the wheel groove, except for those with a particle size greater than 0.05mm, below the outer cylindrical surface contour of the groove wheel; at the same time, the powder in the wheel groove is also scraped flat along the outer edge of the groove wheel. This process makes each wheel groove a volumetric measuring instrument like a "liter or bucket".

[0031] At the same time, during operation, the distance between the lowest sawtooth tip of the outer edge of the roller (a straight line parallel to the axis of the roller) and the inner wall line of the casing (the intersection of the cylindrical surface of the inner wall of the casing and the radial plane at the starting end) is only five or six millimeters. All the powders that are rolled below the outer edge contour line of the groove wheel cannot rise above the groove wheel contour line in such a short stroke and period (there is no force that can force the powder to rise). Therefore, whether the present invention is used for feeding or unloading, it is impossible to clamp the powder between the groove wheel partition and the inner wall of the casing, that is, the raw material particles will not be broken during the operation of the present invention, and the service life of the equipment is doubled. The groove wheel rotates, and the powder in the full groove is relatively stationary and will not leak during the whole process from entering to leaving the sealed space on the right side of the casing (the gap between the outer edge of the groove wheel and the inner wall of the casing is designed to be no more than 0.02mm). That is, the powder that fills the groove at the feed port must be 100% discharged from the discharge port. Therefore, the present invention is essentially a rotating volumetric measuring instrument, and the sum of the volumes of one circle of wheel grooves is called the unit volume; and the product specifications are named after the number of liters (cubic centimeters) of the unit volume (rounded off).

[0032] In actual application, first, according to the standard volume described in the product manual (i.e., the sum of the volumes of one circle of wheel grooves accurate to two decimal places) and the measured bulk density of the raw material powder, the theoretical conveying volume QL of the present invention in kg / min or t / h is calculated in succession when the groove wheel runs one circle and the frequency converter is adjusted to the five gears of 10-50 Hz corresponding to the speed. Then, the actual conveying volume Qs measured at the corresponding speed when the machine is turned on is compared and analyzed with the theoretical conveying volume QL, and the correction coefficient k is derived according to Qs=k QL. Then, 50 Hz is evenly divided into 50 or 100 gears (the number of gears is selected according to the process requirements), and the theoretical conveying volume QL of the present invention at each gear frequency corresponding to the speed is calculated. After the calibration flow value Qb is calculated according to Qb=k QL, the "Feeding Flow Table" corresponding to the frequency and speed and the calibration flow Qb is compiled as the basis for the operation control at the production site. The difference between the powder flow Qs measured at the production site and the calibration flow Qb in the "Feeding Flow Table" is the quantitative error of the present invention. According to the fact that the frequency of the frequency converter can be accurate to two decimal places and the speed regulation accuracy of the frequency converter is ±0.5%, it can be analyzed and inferred that the present invention can accurately change the rotation speed of the control wheel within the range of 50 to 5000; and the difference between the actual flow rate and the calibrated flow rate in each gear must not be greater than 0.5% of the calibrated flow rate. Obviously, these two items are far beyond the reach of existing technologies.

[0033] If the words "first", "second" and the like are used in this patent to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing the present invention and simplifying the description, and the above words have no special meaning.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the invention claimed for protection. The scope of protection claimed for the present invention is defined by the attached claims and their equivalents.

[0035] In the description of the present invention, it is necessary to understand that the terms "front", "rear", "left", "right", "center", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the protection content of the present invention.

Claims

1. A precise quantitative feeder, comprising a cylindrical casing and a groove wheel arranged in the inner cavity of the casing, and the casing is provided with a feed inlet and a discharge inlet, the feed inlet is provided at the upper end of the cylindrical structure, and the discharge inlet is provided at the lower end of the cylindrical structure; characterized in that: The groove wheel is provided with a plurality of partitions at intervals along the radial direction to divide the groove wheel into a plurality of material troughs for receiving materials, and a roller device is also provided on the housing at one side of the feed inlet; The roller device comprises an arc-shaped groove and a roller rotatably arranged in the arc-shaped groove, and the two ends of the roller are inserted into the bearing seats correspondingly arranged at the two ends of the housing; The arc groove is arranged on the feed port side, one end of which is connected to the side wall of the feed port, and the other end is connected to the cylindrical outer wall of the casing, and the gap between the outer circular contour line of the rolling roller and the outer circular contour line of the groove wheel is within 0.05mm.

2. A precise quantitative feeder according to claim 1, characterized in that: The outer end surface of the rolling roller is set as a serrated surface.

3. A precise quantitative feeder according to claim 1, characterized in that: The roller device is arranged on the rotation forward side of the groove wheel.

4. A precise quantitative feeder according to claim 1, characterized in that: The gap between the outer circle of the groove wheel and the inner wall of the casing is not greater than 0.02mm.

5. A precise quantitative feeder according to any one of claims 1 to 4, characterized in that: The rotation speed of the groove wheel is controlled by a frequency converter.

6. A precise quantitative feeder according to claim 5, characterized in that: The bearing seats at both ends of the casing are provided with rolling bearings for supporting the shaft heads at both ends of the rolling roller.

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