A screw auger for feeding a material to be formed

Abstract

A screw and spiral combined feeder for molding material relates to the technical field of feeders, which comprises a nitrogen sealing cabin, the upper end surface of which is communicated with a nitrogen inlet, and the lower end surface of which is communicated with a nitrogen outlet. The left end of an outer cylinder is connected with the right end of the nitrogen sealing cabin, and the cabin end of the outer cylinder is provided with a feeding port. A screw shaft is rotatably arranged in the nitrogen sealing cabin, and the two ends of the screw shaft extend out of the cabin and are provided with sealing assemblies at the contact positions with the two ends of the cabin. The end of the screw shaft extending into the outer cylinder is connected with a screw metering section, the screw metering section is connected with a spiral discharging section, and the pitches of the two sections are the same. During the operation of the utility model, the screw metering section and the spiral discharging section rotate to convey the material in the outer cylinder. The nitrogen sealing cabin cooperates with the sealing assemblies of the screw shaft and the pressurized nitrogen to make the cabin have a positive pressure, prevent the material debris from entering, and guarantee the sealing property and stable operation. The screw metering section is designed to avoid long-distance jamming and to control the feeding amount by adjusting the rotating speed; the spiral discharging section is designed to guarantee the smooth discharge of the material, and the two sections are combined to realize the double targets of the material conveying precision and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of feeder technology, and in particular to a screw-spiral combined feeder for forming materials. Background Technology

[0002] Biomass fuel, produced from plant stalks and fruit shells, is an environmentally friendly new energy source in the form of blocks or rods. Its research and development has become a key and popular topic. Typically, biomass pellets have a diameter of 6–8 mm, a length 4–5 times their diameter, a breakage rate of less than 1.5%–2.0% (by mass), a dry basis moisture content of less than 10%–15% (by mass), an ash content of less than 1.5% (by mass), a sulfur and chlorine content of less than 0.07% (by mass), and a nitrogen content of less than 0.5% (by mass). Compared to other biomass energy technologies, biomass pellet fuel technology is easier to scale up and use.

[0003] In the field of biomass pelleting, especially in the production of high-temperature sensitive materials such as biomass fuels, precise and stable material delivery is crucial. While traditional screw feeders can meet the basic requirements of material delivery to a certain extent, they have many limitations in conveying shaped materials.

[0004] On the one hand, the molding material is prone to generating debris during the conveying process. If this debris enters the sealing parts of the equipment, it can cause the sealing components to fail, thereby affecting the normal operation and service life of the entire equipment. On the other hand, a single screw feeding method is prone to jamming when conveying molding materials over long distances, affecting the smoothness and reliability of material conveying and failing to meet the production requirements of high-precision metering and continuous stable conveying. However, existing technologies lack a device that can effectively achieve stable conveying and accurate metering of molding materials while ensuring sealing and preventing material debris from interfering with the sealing components. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model discloses a screw-spiral combined feeder for forming materials.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A screw-helix combined feeder for molding materials, comprising:

[0008] The nitrogen-sealed chamber is a circular, empty cylinder.

[0009] The nitrogen inlet is connected to the nitrogen-sealed chamber and is used to input nitrogen.

[0010] The nitrogen outlet is connected to the nitrogen sealed chamber and is used to output nitrogen.

[0011] The outer cylinder is connected at its left end to the corresponding right end of the nitrogen-sealed chamber.

[0012] The feeding port is located at one end of the outer cylinder near the nitrogen-sealed chamber and is used to add materials to the outer cylinder.

[0013] The screw shaft is rotatably installed inside the nitrogen-sealed chamber, and both ends of it extend out of the nitrogen-sealed chamber.

[0014] The screw metering section is fastened to the end of the screw shaft that extends into the outer cylinder.

[0015] The spiral discharge section is fastened to the corresponding screw metering section.

[0016] The screw metering section and the spiral discharge section can rotate inside the outer cylinder to transport materials.

[0017] Preferably, connecting flanges are provided at both ends of the nitrogen gas sealing chamber; the connecting flange at the left end is connected to a sealing flange that can install a motor, thereby achieving sealing of the left end of the nitrogen gas sealing chamber.

[0018] Preferably, a nitrogen inlet is installed on the upper end face of the nitrogen sealing chamber near the left end connecting flange using a through-welding process; and a nitrogen outlet is installed on the lower end face of the nitrogen sealing chamber near the right end connecting flange using the same through-welding method.

[0019] Preferably, heat dissipation fins are installed on the outer wall of the outer cylinder corresponding to the right side of the feed port.

[0020] Preferably, sealing components are installed at both ends of the screw shaft in contact with the nitrogen-sealed chamber.

[0021] Preferably, the screw metering section is located directly below the feed port, and its length extending in the direction projected to the right of the feed port does not exceed twice the inner diameter of the outer cylinder.

[0022] Preferably, the screw discharge section and the screw metering section have the same pitch.

[0023] By adopting the technical solution described above, this utility model has the following beneficial effects:

[0024] (1) In this utility model, the connecting flanges at the left and right ends of the nitrogen sealing chamber are respectively sealed to the sealing flange and the outer cylinder. In addition, the screw shaft is connected to the sealing components at both ends of the nitrogen sealing chamber, and the pressurized nitrogen gas is continuously introduced to keep the chamber under positive pressure. This effectively prevents biomass pellet debris from entering the sealing components and the nitrogen sealing chamber, thereby ensuring the overall sealing performance and long-term stable operation of the equipment and avoiding problems such as material waste, environmental impact and equipment failure caused by leakage.

[0025] (2) The screw metering section of this utility model is located directly below the feeding port. Its specific extension length design avoids the jamming phenomenon during long-distance operation. The feed amount can be accurately controlled by adjusting the speed, so as to achieve accurate measurement of materials. The screw discharge section has the same pitch design as the screw metering section and the structure extending to the flange at the discharge port, which ensures that the materials can be discharged smoothly. The combination of the two gives full play to their respective advantages, which not only achieves accurate measurement of shaped biomass fuel, but also meets the requirements of smooth transportation. It effectively takes into account the dual process goals of material transportation accuracy and efficiency, and provides a strong guarantee for the efficient and stable operation of the entire production process.

[0026] (3) The heat dissipation fins provided on the outer wall of the outer cylinder of this utility model have significant advantages. They can dissipate heat for the outer cylinder and the biomass pellets inside, prevent the heat generated by the high-temperature reactor from being transferred to the outer cylinder, and avoid the phenomenon of the biomass pellets inside the outer cylinder becoming damp and soft due to heat. This ensures the accuracy and stability of the biomass pellets during the metering and transportation process, and is conducive to improving the quality and efficiency of subsequent processes. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] In the diagram: 1. Screw shaft; 2. Nitrogen sealed chamber; 3. Nitrogen inlet; 4. Nitrogen outlet; 5. Screw metering section; 6. Feed port; 7. Outer cylinder; 8. Spiral discharge section; 9. Heat dissipation fins; 10. Discharge port. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] In the description of this utility model, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Example 1:

[0032] Combined with appendix Figure 1 A screw-screw combined feeder for forming materials includes a screw shaft 1, a nitrogen-sealed chamber 2, and an outer cylinder 7.

[0033] One end of the outer cylinder 7 is equipped with a nitrogen-sealed chamber 2, which is designed as a circular hollow cylinder with connecting flanges at both ends. Specifically, the left connecting flange is connected to a sealing flange capable of installing a motor, thus sealing the left end of the nitrogen-sealed chamber 2. In the structure of the nitrogen-sealed chamber 2, a nitrogen inlet 3 is precisely installed near the upper end face of the left connecting flange using a through-welding process; correspondingly, a nitrogen outlet 4 is also installed near the lower end face of the right connecting flange using a through-welding method. Pressurized nitrogen is introduced into the chamber through the nitrogen inlet 3. After the nitrogen completes the sealing and cooling functions inside the chamber, it is discharged through the nitrogen outlet 4. This inlet-outlet design ensures that the nitrogen-sealed chamber 2 can effectively perform its intended cooling and sealing functions.

[0034] The outer cylinder 7 also adopts a circular hollow structure, with mounting flanges at both ends. The mounting flange at the left end of the outer cylinder 7 forms a sealed connection with the connecting flange at the right end of the nitrogen-sealed chamber 2, ensuring the sealing of the joint. The mounting flange at the right end of the outer cylinder 7 is sealed to the high-temperature reactor, ensuring the sealing performance of the entire system during operation. A feed port 6 is provided on the outer cylinder 7 near the nitrogen-sealed chamber 2 for adding materials. Heat dissipation fins 9 are installed on the outer wall of the outer cylinder 7 to the right of the feed port 6. The main function of the heat dissipation fins 9 is to dissipate heat from the outer cylinder 7 and the biomass pellets inside, preventing heat generated by the high-temperature reactor from being transferred to the outer cylinder 7, avoiding the biomass pellets inside the outer cylinder 7 from becoming damp and soft due to heat, and ensuring the accuracy and stability of the metering and conveying process of the biomass pellets.

[0035] The screw shaft 1, as a rotating component, is installed on the center line of the cavity between the nitrogen-sealed chamber 2 and the outer cylinder 7, achieving a through-type arrangement. The left end of the screw shaft 1 extends from the nitrogen-sealed chamber 2 and is connected to the drive motor to obtain power for rotational motion. Simultaneously, sealing components are installed at both ends of the contact points between the screw shaft 1 and the nitrogen-sealed chamber 2. These sealing components are designed and installed to ensure the sealing performance of the nitrogen-sealed chamber 2. Because nitrogen is continuously supplied into the nitrogen-sealed chamber 2, its interior is always kept under positive pressure. This positive pressure environment effectively prevents biomass pellet debris from entering the sealing components and the nitrogen-sealed chamber 2, thus avoiding sealing component failure due to debris ingress and ensuring the long-term stable operation of the equipment.

[0036] At the end of the screw shaft 1 that extends into the outer cylinder 7, the screw metering section 5 and the screw discharge section 8 are connected in sequence. The screw metering section 5 is located directly below the feed port 6, and its length extending in the direction projected to the right of the feed port 6 does not exceed twice the inner diameter of the outer cylinder 7. This length is designed to avoid jamming that may occur in the screw feed section 5 during long-distance operation, ensuring the smoothness and reliability of the screw metering section 5 during material conveying.

[0037] The screw discharge section 8 and the screw metering section 5 adopt the same screw pitch design, with its right end extending to the mounting flange of the discharge port 10 of the outer cylinder 7, ensuring that the material can be smoothly discharged from the discharge port 10. The advantage of the screw metering section 5 is that the feed rate can be precisely controlled by adjusting its rotation speed, achieving accurate material metering. However, due to its structural characteristics, it is relatively prone to jamming when conveying biomass fuel, therefore its length needs to be strictly limited to avoid jamming problems caused by excessive length affecting the normal operation of the equipment. The screw discharge section 8, on the other hand, exhibits good smoothness in the conveying of biomass fuel, although it has certain limitations in metering accuracy. By combining the screw metering section 5 and the screw discharge section 8, the advantages of both can be fully utilized to achieve accurate metering and smooth conveying of shaped biomass fuel, meeting the dual requirements of material conveying accuracy and efficiency in the process.

[0038] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents within this utility model.

Claims

1. A screw-helix combination feeder for a molding material, characterized by, include: Nitrogen-sealed chamber (2), which is a circular empty cylinder; Nitrogen inlet (3) is connected to nitrogen sealed chamber (2) and is used to input nitrogen; Nitrogen outlet (4) is connected to nitrogen sealed chamber (2) and is used to output nitrogen. The outer cylinder (7) is connected at its left end to the right end of the nitrogen-sealed chamber (2); The feeding port (6) is located at one end of the outer cylinder (7) near the nitrogen sealing chamber (2) and is used to add materials to the outer cylinder (7); The screw shaft (1) is rotatably installed inside the nitrogen-sealed chamber (2), and both ends of it extend out of the nitrogen-sealed chamber (2). The screw metering section (5) is fastened to one end of the screw shaft (1) that extends into the outer cylinder (7); The spiral discharge section (8) is fastened to the corresponding screw metering section (5); Among them, the screw metering section (5) and the spiral discharge section (8) can rotate inside the outer cylinder (7) to convey materials.

2. The screw-helix combined feeder for forming materials as described in claim 1, characterized in that: The nitrogen-sealed chamber (2) is provided with connecting flanges at both ends; the connecting flange at the left end is connected to a sealing flange that can install a motor, thus achieving sealing at the left end of the nitrogen-sealed chamber (2).

3. The screw-helix combined feeder for forming materials as described in claim 1, characterized in that: A nitrogen inlet (3) is installed on the upper end face of the nitrogen sealing chamber (2) near the left end connecting flange by through welding; a nitrogen outlet (4) is installed on the lower end face of the nitrogen sealing chamber (2) near the right end connecting flange by through welding.

4. The screw-helix combined feeder for forming materials as described in claim 1, characterized in that: The outer cylinder (7) is fitted with heat dissipation fins (9) on the outer wall corresponding to the right side of the feed port (6).

5. The screw-helix combined feeder for forming materials as described in claim 1, characterized in that: The screw shaft (1) and the nitrogen-sealed chamber (2) are both equipped with sealing components at their contact points.

6. The screw-helix combined feeder for forming materials as described in claim 1, characterized in that: The screw metering section (5) is located directly below the feed port (6), and its length extending to the right side of the feed port (6) does not exceed twice the inner diameter of the outer cylinder (7).

7. The screw-helix combined feeder for forming materials as described in claim 1, characterized in that: The screw discharge section (8) has the same pitch as the screw metering section (5).

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