Packaging metering and dispensing device

Abstract

The application relates to the powder filling technical field, and particularly discloses a packaging metering and discharging device, which comprises a material bin, a metering motor, a metering screw rod, stirring fan blades arranged in the material bin, a stirring motor arranged above the material bin, a vertical downward discharge port arranged at the bottom of the material bin, and the metering screw rod is vertically arranged in the discharge port. The technical problem that the powder quantity fluctuates and the metering is not accurate enough is solved by arranging the stirrer in the material bin to enhance the flowability of the oily powder and pressurize the metering screw rod to feed the material.

Description

Technical Field

[0001] This utility model relates to the field of powder filling technology, specifically a packaging metering and feeding device. Background Technology

[0002] Currently, powder product packaging commonly employs automated technology to achieve high-precision and high-efficiency quantitative dispensing. The core control of this quantitative dispensing lies in the metering screw. A metering screw is designed with a fixed-volume spiral groove cavity in its thread clearance. When the metering screw rotates through the material, the material fills the spiral groove cavity. Since the volume of the spiral groove cavity is fixed, the amount of material pushed out per rotation of the metering screw is a fixed volume. Therefore, by controlling the number of rotations of the metering screw, the amount of material pushed out can be controlled, thus completing the metering and packaging. In actual operation, the metering screw rotates under the drive of a device (such as a servo motor or stepper motor), and the spiral blades push the material from the hopper to the discharge port. By controlling the number of rotations or the time of rotation, the fixed volume of the spiral groove cavity on the metering screw is used to complete the quantitative conveying.

[0003] While theoretically metering screws can quantitatively convey materials for packaging, current metering screw technologies are mostly vertical gravity-feed screw metering systems that rely on the material's own weight to fill the screw gaps. However, oily powders (such as Dendrobium officinale molecular essence powder) have high surface tension and poor flowability, making them prone to sticking and accumulating at the feed inlet between the hopper and the metering screw. This results in uneven material entry into the metering screw, or even failure to enter the screw altogether, causing the screw shaft to spin idly or intermittently stop feeding. Consequently, metering inaccuracies occur. According to actual measurement data, this structure exhibits metering deviations of ±3%-5% for oily materials.

[0004] To address the technical problem of high surface tension and poor flowability of oily powders, which prevents metering screws from accurately measuring the material, most existing technologies employ stirring to enhance material flowability. For example, patent document CN202029371U discloses an extruder stirring and feeding structure, which has a vertical stirring paddle at the top of the feeding hopper and a horizontal stirrer at the bottom of the feeding hopper. The two stirrers stir the powder in different directions within the feeding hopper, allowing the powder to enter the extruder screw evenly and smoothly.

[0005] While the aforementioned patented technology utilizes stirring to increase powder flowability to some extent, improving bridging and material breakage in the silo, it still suffers from drawbacks. To prevent breakage, it employs a horizontal agitator to pressurize and feed the metering screw. This pressurization relies on the agitator's blades pressurizing the oily powder and pushing it into the spiral groove cavity inside the screw. The drawback is that when the metering screw rotates, if the agitator blades are directly above the screw, the powder is compacted due to the blades' rotation, resulting in more powder entering the screw. However, the portion of the spiral groove cavity between the two blades receives less powder due to the lack of pressurization. Therefore, the amount of powder in the spiral groove cavity of the metering screw varies, leading to inaccurate metering. Utility Model Content

[0006] The purpose of this utility model is to provide a packaging metering and feeding device to solve the technical problem mentioned above in the prior art, where an agitator is installed in the hopper to feed the metering screw in order to enhance the flowability of oily powder, which causes fluctuations in the amount of powder and ultimately leads to inaccurate metering.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows: a packaging metering and feeding device, including a hopper, a metering motor, a metering screw, a stirring fan blade installed inside the hopper, a stirring motor installed above the hopper, a vertically downward discharge port at the bottom of the hopper, and the metering screw vertically installed in the discharge port.

[0008] The beneficial effects of this implementation plan are as follows:

[0009] 1. In existing technologies, to enhance the flowability of oily powders (such as Dendrobium officinale molecular essence powder) and prevent the powder from sticking and accumulating at the feed inlet between the hopper and the metering screw, thus avoiding problems like the screw shaft spinning idly or intermittent feed interruption, an agitator is installed in the hopper to pressurize and feed the metering screw. This method of pressurizing the metering screw with the agitator causes the powder to be compacted when the agitator blades are rotating above the screw, resulting in more powder entering the screw. However, the portion between the two agitator blades, lacking the pressurization effect of the blades, receives less powder. Therefore, the amount of powder entering the metering screw can be inaccurate, leading to inaccurate metering. To avoid this situation, this application verticalizes the originally horizontally positioned metering screw and places it directly in the hopper. The mixing blades maintain the fluidity of the oily powder, and the screw rotates directly in the powder in the hopper, pushing the powder towards the outlet. This reduces the likelihood of material interruption. The discharge rate is controlled by the hopper outlet working in conjunction with the metering screw. Therefore, compared to metering and packaging devices without a mixer, the fluidity of the oily powder is better, and compared to metering and packaging devices with a mixer for pressurization, the metering is more accurate.

[0010] Furthermore, the system also includes several agitator blade mounting tubes, with the number of agitator blades matching the number of mounting tubes. The agitator blades are fixedly mounted on the mounting tubes. Each mounting tube has a driven sprocket at its upper end. A drive sprocket is connected to the output shaft of the agitator motor. A chain connects the drive sprocket and the driven sprocket, meshing with each driven sprocket and drive sprocket. Using a single motor to drive all agitator blades reduces the number of motors required on a single device, thus lowering the cost of the equipment.

[0011] Furthermore, the stirring blade mounting tube is a hollow tube, and the driven sprocket has a through hole at its center with the same diameter as the stirring blade mounting tube cavity. The metering screw passes through the through hole in the stirring blade mounting tube cavity and the center of the driven sprocket and is fixedly connected to the output shaft of the metering motor. By using a sleeve structure to set up the metering screw and stirring blade, this application can install more stirring blades and metering screws in the same volume cavity. For equipment of the same size, this application can perform metering and packaging of a larger quantity.

[0012] Furthermore, a double-layered mounting bracket is provided above the hopper, with the stirring motor installed on the lower layer and the metering motor installed on the upper layer. This layered arrangement of the stirring and metering motors allows for a more compact installation space and ensures that even in the event of an unexpected machine malfunction, the metering motor will not collide with the driven sprocket, thus protecting the motor's safety.

[0013] Furthermore, the silo is also equipped with a feed inlet, which is connected to an anti-accumulation triangular tube, and the anti-accumulation triangular tube is connected to a feed pipe. The inclined design of the anti-accumulation triangular tube prevents oily powder from accumulating when it enters the silo.

[0014] Furthermore, the stirring blades are arranged in a staggered, layered configuration. This staggered arrangement allows for more thorough agitation of the powder, preventing oily powder from separating and sticking together, thus avoiding loss of fluidity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 A schematic diagram of the hopper structure with the front panel removed.

[0017] Figure 3 for Figure 1 A structural diagram from the rear view.

[0018] Figure 4 This is a schematic diagram showing the positions of the metering screw and the mixing blades in the hopper after installation. Detailed Implementation

[0019] The following detailed description illustrates the specific implementation method:

[0020] The reference numerals in the accompanying drawings include: 1. hopper; 11. feed pipe; 12. feed inlet; 121. anti-accumulation triangular tube; 13. discharge outlet; 131. metering pipe; 2. mixing mounting plate; 21. support rod; 3. metering mounting plate; 4. metering motor; 5. mixing motor; 51. motor mounting bracket; 52. drive sprocket; 53. driven sprocket; 54. chain; 55. mixing blade mounting pipe; 6. mixing blade; 7. metering screw.

[0021] Implementation, for example, attached Figure 1-4 As shown: A packaging metering and feeding device includes a hopper 1, for... Figure 2 The direction is descriptive. The main body of silo 1 is a hollow structure. An inlet 12 is opened on the rear side plate at the upper end of the hollow main body of silo 1. The inlet 12 is connected to the feed pipe 11 via an anti-accumulation triangular tube 121. Therefore, the processed powder can enter silo 1 through the feed pipe 11. Furthermore, because the anti-accumulation triangular tube 121 has an inclined plate inside, the powder is less likely to accumulate. Several through holes are evenly spaced on the bottom plate at the lower end of silo 1. Each through hole is individually connected to a different outlet 13 of silo 1. The upper end of the outlet 13 is a conical structure, and the lower end is a metering pipe 131.

[0022] No cover is provided at the upper opening of silo 1; the mixing mounting plate 2 is used directly as the cover. A positioning groove, identical in size to the upper opening of silo 1, is located on the bottom surface of the mixing mounting plate 2. Therefore, when installing the mixing mounting plate 2 on silo 1, the positioning groove must be aligned with the upper side wall of silo 1, ensuring the upper side wall of silo 1 is engaged in the positioning groove, and then bolts are used to secure the two together. After installation, the mixing blade 6 is in silo 1, and the lower end of the metering screw 7 is inserted into the metering tube 131. It is worth noting that the metering screw 7 is divided into two sections: the upper end is a smooth rod, and the lower end is a screw with a pre-set spiral groove cavity. After the mixing mounting plate 2 is installed in silo 1, as... Figure 4 As shown, part of the screw portion of the metering screw 7 is located in the metering tube 131, and part is located in the conical discharge port 13, with the uppermost end of the screw portion directly located at the lower end of the main cavity of the hopper 1.

[0023] A support rod 21 is fixedly installed on the mixing mounting plate 2, and a metering mounting plate 3 is fixedly installed on the upper end of the support rod 21. The fixing method includes, but is not limited to, welding. The support rod 21 is used to form a double-layer mounting bracket between the mixing mounting plate 2 and the metering mounting plate 3.

[0024] Several through holes, corresponding to the discharge port 13, are opened on the mixing mounting plate 2. A mixing blade mounting tube 55, a hollow stainless steel tube, is rotatably connected to these through holes via bearings. One end of the mixing blade mounting tube 55 extends into the hopper 1, and mixing blades are fixedly installed in staggered layers, with fixing methods including but not limited to threaded fixing. The other end extends out of the upper surface of the mixing mounting plate 2 and is welded to the driven sprocket 53. A through hole with the same diameter as the cavity of the mixing blade mounting tube 55 is located at the center of the driven sprocket 53, forming a through-passage between the mixing blade mounting tube 55 and the center of the driven sprocket 53. Because the driven sprocket 53 and the mixing blade mounting tube 55 are welded together, when the driven sprocket 53 rotates, it drives the mixing blade mounting tube 55 to rotate as well, thereby causing the mixing blades 6 to rotate accordingly. Figure 1The direction is described. A stirring motor 5 is mounted on the right end of the stirring mounting plate 2. Since the length of the metering mounting plate 3 is less than that of the stirring mounting plate 2, the stirring motor 5 is mounted on the part of the stirring mounting plate 2 that is longer than the metering mounting plate 3. The stirring motor 5 is mounted upside down on the stirring mounting plate 2 using a motor mounting bracket 51. The motor mounting bracket 51 consists of four columns welded and fixed to the stirring mounting plate 2. Two mounting plates are welded to the columns, and the stirring motor 5 is fixed to the motor mounting bracket 51 using threaded holes on the mounting plates. Because the stirring motor 51 is mounted upside down, its output shaft faces downwards. A drive sprocket 52 is keyed to the output shaft. Therefore, when the motor starts, the drive sprocket 52 on the output shaft will also rotate along with the output shaft. A chain 54 is provided between the drive sprocket 52 and the driven sprocket 53 for transmission. Therefore, the stirring motor 5 can simultaneously drive all the driven sprockets 53 to rotate, thereby driving all the stirring blades 6 to rotate.

[0025] The metering mounting plate 3 also has through holes, through which several metering motors 4 are mounted. The metering motors are fixed to the metering mounting plate 3 with screws, and their output shafts pass through the through holes to reach the bottom of the metering mounting plate 3. To avoid obstructing the rotation of the output shaft of the metering motor 4, the diameter of the through hole is larger than the diameter of the output shaft of the metering motor 4. Since the center of the stirring blade mounting tube 55 and the driven sprocket 53 forms a through-hole, the metering screw 7 passes through the through-hole between the stirring blade mounting tube 55 and the driven sprocket 53 and is fixedly mounted to the output shaft of the metering motor 4. The metering motor 4 drives the metering screw 7 to rotate.

[0026] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A packaging metering and feeding device, comprising a hopper, a metering motor, a metering screw, a stirring fan blade disposed within the hopper, and a stirring motor disposed above the hopper, characterized in that: The hopper has a vertically downward discharge port at its bottom, and the metering screw is vertically installed in the discharge port. It also includes several agitator blade mounting tubes, each a hollow tube. The metering screw passes through a through-hole in the center of the agitator blade mounting tube and is fixedly connected to the output shaft of the metering motor. The number of agitator blades matches the number of agitator blade mounting tubes. The agitator blades are fixedly installed on the agitator blade mounting tubes. Each agitator blade mounting tube has a driven sprocket at its upper end. The driven sprocket has a through-hole in its center that matches the diameter of the agitator blade mounting tube and is penetrated by the metering screw. A drive sprocket is connected to the output shaft of the agitator motor. A chain connects the drive sprocket and the driven sprocket, and the chain meshes with each driven sprocket and drive sprocket.

2. The packaging metering and feeding device according to claim 1, characterized in that: The silo is equipped with a double-layered mounting bracket. The stirring motor is installed on the lower layer of the mounting bracket, and the metering motor is installed on the upper layer of the mounting bracket.

3. The packaging metering and feeding device according to claim 2, characterized in that: The hopper is also equipped with a feed inlet, which is connected to an anti-accumulation triangular tube, and the anti-accumulation triangular tube is connected to a feed pipe.

4. The packaging metering and feeding device according to claim 3, characterized in that: The stirring blades are arranged in alternating layers.

Images