Double-screw powder feeder

Abstract

The utility model discloses a double-screw powder feeder, and relates to the technical field of powder feeders. According to the technical scheme, the feeding device is characterized by comprising a machine body and a base fixedly connected with the machine body, a stock bin communicated with the base is fixedly connected to the base, two feeding screws are rotationally connected into the base, and a contact roller abutting against the feeding screws is slidably connected into the machine body; the side, away from the stock bin, of the base is fixedly connected with a discharging pipe communicated with the base, the discharging pipe is slidably connected with a switch plate, the switch plate is fixedly connected with the contact roller through a connecting plate, and the communication area of the base and the discharging pipe is inversely proportional to the contact area of the contact roller and the feeding screw. According to the utility model, the double screws are additionally arranged in the base, so that materials uniformly enter the hot melt extruder, and the problem of bridging of the materials is solved.

Description

Technical Field

[0001] This utility model relates to the field of powder feeding machine technology, and more specifically, to a twin-screw powder feeding machine. Background Technology

[0002] The screw feeder is used in conjunction with the hot melt extruder. The discharge port of the screw feeder is connected to the feed port of the hot melt extruder. The screw feeder uses a frequency converter for stepless and precise speed regulation. The material is driven by the outward push of the screw, so that the material enters the hot melt extruder evenly and solves the problem of material bridging.

[0003] During the use of the powder feeder, some powder may get stuck inside the screw threads. As the usage time increases, the amount of powder stuck in the threads will increase and agglomerate due to mutual friction. The formation of agglomerates will prevent the powder from passing through the screw threads, affecting the powder feeding efficiency of the equipment. Therefore, a structure is designed to solve the problem of material agglomeration between the screw threads affecting the powder feeding efficiency. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a twin-screw powder feeder, which improves the overall powder feeding efficiency of the equipment through structural design.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: The twin-screw powder feeder includes a machine body and a base fixedly connected thereto. A hopper communicating with the base is fixedly connected to the base. Two feeding screws are rotatably connected inside the base. A contact roller that abuts against the feeding screws is slidably connected inside the machine body. A discharge pipe communicating with the base is fixedly connected to the side of the base away from the hopper. A switch plate is slidably connected to the discharge pipe. The switch plate and the contact roller are fixedly connected through a connecting plate. The communication area between the base and the discharge pipe is inversely proportional to the contact area between the contact roller and the feeding screw.

[0006] The present invention is further configured such that: an adhesive strip with elastic deformation properties is fixedly connected to the outer peripheral wall of the contact roller, and the thickness of the adhesive strip on the side closer to the hopper is greater than the thickness on the other side.

[0007] The present invention is further configured such that: a receiving groove is provided in the machine body for the contact roller to slide and communicate with the base; a magnetic block one is fixedly connected to the side wall of the receiving groove and the inner wall of the base respectively; a magnetic block two is fixedly connected to both ends of the contact roller respectively; and the pulling force of the switch plate on the contact roller is greater than the attraction force between the magnetic block one and the magnetic block two.

[0008] The present invention is further configured such that: a sliding groove communicating with the receiving groove is provided on the bottom surface of the machine body, the connecting plate is slidably connected in the sliding groove, and the connecting plate is located at the midpoint of the contact roller.

[0009] The present invention is further configured such that: a connecting groove is provided on the discharge pipe that extends through its own length direction; the switch plate is slidably connected to the inner wall of the connecting groove; the cross-sectional area of ​​the opening on the side of the connecting groove closer to the machine body is smaller than the cross-sectional area on the other side; and an enlarged block is fixedly connected to the end of the switch plate away from the machine body.

[0010] The present invention is further configured such that: a rotating roller extending into the hopper is fixedly connected to the side wall of the machine body, and a plurality of bridge-breaking knives are fixedly connected to the outer peripheral wall of the rotating roller.

[0011] The present invention is further configured such that: the bridge breaking knife includes a connecting rod and an arc-shaped rod, one end of the connecting rod is fixedly connected to the rotating roller, the other end of the connecting rod is fixedly connected to the arc-shaped rod, and the opening of the arc-shaped rod is away from the inner wall of the hopper.

[0012] In summary, this utility model has the following beneficial effects: by increasing the number of feeding screws to increase their contact area with the material, the material can enter the hot melt extruder more evenly, reducing the bridging of the material. After one round of feeding is completed, the worker pulls the switch plate to slide it in the connecting groove to close the discharge pipe. At this time, the contact roller extends into the base along with the switch plate and contacts the two feeding screws and adheres to the inner wall of both, thereby removing the powder lumps accumulated at the screw threads and reducing the situation where powder lumps block the threads and affect the powder feeding efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the present invention;

[0015] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0016] Figure 4 for Figure 3 Enlarged view of section B in the middle.

[0017] In the diagram: 1. Machine body; 2. Base; 3. Hopper; 4. Feeding screw; 5. Contact roller; 6. Discharge pipe; 7. Switch plate; 8. Adhesive strip; 9. Receiving groove; 10. Magnetic block one; 11. Magnetic block two; 12. Sliding groove; 13. Connecting groove; 14. Enlarging block; 15. Rotating roller; 16. Bridge breaking knife; 17. Arc rod. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] This twin-screw powder feeder, such as Figure 1 , Figure 2 and Figure 4 As shown, the device includes a machine body 1 and a base 2 fixedly connected to it. A hopper 3 connected to and communicating with the base 2 is fixedly connected to the base 2. Two feeding screws 4 are rotatably connected inside the base 2. The feeding screws 4 are driven to rotate by a motor located inside the machine body 1. By increasing the number of feeding screws 4, the contact area between the equipment and the material is increased, allowing the material to pass evenly through the feeding screws 4 into the hot melt extruder, reducing material bridging. A contact roller 5 is slidably connected inside the machine body 1, abutting against the feeding screws 4. An adhesive strip 8 with elastic deformation properties is adhered to the outer peripheral wall of the contact roller 5. The outer peripheral wall of the feeding screw 4 has several threads. Therefore, when the contact roller 5 abuts against the two feeding screws 4, the adhesive strip 8 can completely abut against the inner wall of the threads, thereby adsorbing the material inside the threads. The thickness of the adhesive strip 8 on the side closer to the hopper 3 is greater than the thickness on the other side. Therefore, the contact area between the adhesive strip 8 and the feeding screw 4 is increased, allowing it to simultaneously adhere to more powder blocks inside the threads. The motor drives the feeding screw 4 to rotate, so that every part of the feeding screw 4 can contact the contact roller 5, ensuring the stable removal of powder blocks inside the threads and ensuring the powder feeding efficiency of the equipment.

[0020] like Figure 1 and Figure 3 As shown, a discharge pipe 6 connected to the base 2 is integrally formed on the side of the base 2 away from the hopper 3. A switch plate 7 is slidably connected to the discharge pipe 6. A connecting groove 13 extending through the length of the discharge pipe 6 is provided on the discharge pipe 6. The switch plate 7 is slidably connected to the inner wall of the connecting groove 13. The connecting groove 13 provides guidance for the sliding of the switch plate 7, ensuring the stable sealing of the discharge pipe 6 by the switch plate 7. An enlarged block 14 is integrally formed on the end of the switch plate 7 away from the machine body 1. The cross-sectional area of ​​the opening of the connecting groove 13 on the side closer to the machine body 1 is smaller than the cross-sectional area on the other side. Therefore, the side wall of the enlarged block 14 will abut against the inner wall of the discharge pipe 6, so that the switch plate 7 will not come out of the discharge pipe 6 when it is not sealed, thus ensuring the stable use of the structure.

[0021] like Figures 1-4 As shown, the switch plate 7 and the contact roller 5 are welded together by a connecting plate. The connecting area of ​​the base 2 and the discharge pipe 6 is inversely proportional to the contact area of ​​the contact roller 5 and the feeding screw 4. When a batch of material flows out of the discharge pipe 6, people pull the switch plate 7 to slide away from the machine body 1 to close the discharge pipe 6. At this time, the contact roller 5 will move together with the switch plate 7 to abut against the feeding screw 4, thus avoiding the contact roller 5 contacting the feeding screw 4 during the use of the equipment and affecting the normal use of the equipment.

[0022] like Figure 1 , Figure 2 and Figure 4 As shown, the machine body 1 has a receiving groove 9 for the contact roller 5 to slide and communicate with the base 2. The receiving groove 9 provides a space for the contact roller 5, reducing the possibility of dust in the air being attracted by the adhesive strip 8 when the contact roller 5 is exposed to the air. Magnetic blocks 10 are respectively adhered to the side wall of the receiving groove 9 and the inner wall of the base 2. Magnetic blocks 21 are respectively adhered to both ends of the contact roller 5. The pulling force of the switch plate 7 on the contact roller 5 is greater than the attraction force between the magnetic blocks 10 and 21. In the initial state, the magnetic blocks 21 are fixed in the receiving groove 9. The magnetic blocks 10 on the side wall of the receiving groove 9 attract each other, thereby fixing the contact roller 5 in the receiving groove 9. When a pulling force is applied to the switch plate 7 to make it slide, since the pulling force on the contact roller 5 is greater than the attraction between the magnetic blocks 10 and 11, the contact roller 5 will slide out of the receiving groove 9 under the drive of the switch plate 7. When the contact roller 5 moves a certain distance, the magnetic blocks 11 will attract each other to the magnetic blocks 10 fixed on the side wall of the base 2, so that the contact roller 5 completely passes through the receiving groove 9 and comes into full contact with the two feeding screws 4.

[0023] like Figures 1-4 As shown, a sliding groove 12 communicating with the receiving groove 9 is provided on the bottom surface of the machine body 1. The connecting plate is slidably connected in the sliding groove 12. The connecting plate is located at the midpoint of the contact roller 5. Since the length of the switch plate 7 is less than the length of the contact roller 5, the length that the contact roller 5 needs to move is reduced by setting the fixed position of the connecting plate, so that the switch plate 7 and the contact roller 5 can simultaneously abut against the inner wall of the discharge pipe 6 and the base 2 respectively.

[0024] like Figures 1-3 As shown, a rotating roller 15 extending into the hopper 3 is fixedly connected to the side wall of the machine body 1. The rotating roller 15 is driven to rotate by a motor 2 installed inside the machine body 1. The distance between the rotating roller 15 and the feeding screw 4 is less than the distance between the rotating roller 15 and the top surface of the hopper 3, thus reducing the phenomenon of material bridging between the two feeding screws 4, ensuring the efficiency and quality of powder feeding. Several bridging blades 16 are fixedly connected to the outer peripheral wall of the rotating roller 15. The bridging blade 16 includes a connecting rod and an arc-shaped rod 17. One end of the connecting rod is fixedly connected to the rotating roller 15, and the other end of the connecting rod is fixedly connected to the arc-shaped rod 17. The opening of the arc-shaped rod 17 is away from the inner wall of the hopper 3. Since the outer peripheral wall of the hopper 3 is arc-shaped, the arc-shaped rod 17 can better protect the inner wall of the hopper 3 and reduce the situation of material sticking to the inner wall of the hopper 3.

[0025] Working principle: When the equipment is working normally, the contact roller 5 is housed in the receiving groove 9, and the outer peripheral wall of the enlarged block 14 abuts against the inner wall of the discharge pipe 6. After feeding is completed, the switch plate 7 is pulled to close the discharge pipe 6. The movement of the switch plate 7 will apply a pulling force to the contact roller 5, causing the pulling force between the magnetic block 10 and the magnetic block 2 11 to disappear, thus moving it together with the switch plate 7. When the end of the contact roller 5 away from the machine body 1 abuts against the inner wall of the base 2, the adhesive sheet is in complete contact with the two feeding screws 4, thereby sticking the powder block located in the thread off. Then, the motor drives the feeding screw 4 to rotate, so that all parts of the outer peripheral wall of the feeding screw 4 are in contact with the adhesive strip 8, thereby achieving a complete cleaning of the feeding screw 4.

[0026] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A twin-screw powder feeder, comprising a body (1) and a base (2) fixedly connected thereto, wherein a hopper (3) communicating with the base (2) is fixedly connected to the base (2), characterized in that: Two feeding screws (4) are rotatably connected inside the base (2). A contact roller (5) that abuts against the feeding screws (4) is slidably connected inside the machine body (1). A discharge pipe (6) that communicates with the base (2) is fixedly connected to the side of the base (2) away from the hopper (3). A switch plate (7) is slidably connected to the discharge pipe (6). The switch plate (7) and the contact roller (5) are fixedly connected through a connecting plate. The communication area between the base (2) and the discharge pipe (6) is inversely proportional to the contact area between the contact roller (5) and the feeding screws (4).

2. The twin-screw powder feeder according to claim 1, characterized in that: An adhesive strip (8) with elastic deformation properties is fixedly connected to the outer peripheral wall of the contact roller (5). The thickness of the adhesive strip (8) on the side closer to the hopper (3) is greater than the thickness on the other side.

3. The twin-screw powder feeder according to claim 1, characterized in that: The machine body (1) has a receiving groove (9) for the contact roller (5) to slide and communicate with the base (2). Magnetic block one (10) is fixedly connected to the side wall of the receiving groove (9) and the inner wall of the base (2). Magnetic block two (11) is fixedly connected to both ends of the contact roller (5). The pulling force of the switch plate (7) on the contact roller (5) is greater than the attraction force between magnetic block one (10) and magnetic block two (11).

4. The twin-screw powder feeder according to claim 3, characterized in that: The bottom surface of the machine body (1) is provided with a sliding groove (12) that communicates with the receiving groove (9). The connecting plate is slidably connected in the sliding groove (12) and the connecting plate is located at the midpoint of the contact roller (5).

5. The twin-screw powder feeder according to claim 1, characterized in that: The discharge pipe (6) has a connecting groove (13) that runs through its own length. The switch plate (7) is slidably connected to the inner wall of the connecting groove (13). The cross-sectional area of ​​the opening of the connecting groove (13) on the side closer to the machine body (1) is smaller than the cross-sectional area on the other side. An enlarged block (14) is fixedly connected to the end of the switch plate (7) away from the machine body (1).

6. The twin-screw powder feeder according to claim 1, characterized in that: A rotating roller (15) extending into the hopper (3) is fixedly connected to the side wall of the machine body (1), and a number of bridge-breaking knives (16) are fixedly connected to the outer peripheral wall of the rotating roller (15).

7. The twin-screw powder feeder according to claim 6, characterized in that: The bridge-breaking cutter (16) includes a connecting rod and an arc-shaped rod (17). One end of the connecting rod is fixedly connected to the rotating roller (15), and the other end of the connecting rod is fixedly connected to the arc-shaped rod (17). The opening of the arc-shaped rod (17) is away from the inner wall of the hopper (3).

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