A feeding and extrusion coordination unit for an extruder

Abstract

This utility model relates to the field of extruder technology, and particularly to a feeding and extrusion coordination unit for an extruder, including a feeding hopper, a barrel located below the feeding hopper, and an extrusion screw located inside the barrel. A stirring seat is provided between the feeding hopper and the barrel. Two stirring screws are arranged horizontally side by side inside the stirring seat. A transmission component is provided at one end of the stirring screw extending outside the stirring seat to cause the two to rotate synchronously. A drive source is provided outside the stirring seat to drive one of the stirring screws to rotate around an axis. A stirring chamber is provided inside the stirring seat. The upper opening of the stirring chamber is connected to the discharge port of the feeding hopper, and the lower opening is connected to the feed groove on the barrel. The helical blades of the stirring screws are located inside the stirring chamber, and there is a gap between the helical blades of the two stirring screws. The beneficial effect of this utility model is that the stirring speed can be adjusted in real time according to the material extrusion requirements, reducing the overall energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of extruder technology, specifically to a feeding and extrusion coordination unit for an extruder. Background Technology

[0002] Extruders are widely used in the production of plastics, rubber, and other products. In the production process, the screw is mainly used to transport and plasticize the mixture. However, if a mixture of various solid plastics is not manually mixed beforehand after being fed into the hopper, the following problems arise: 1. It affects the screw's conveying efficiency, leading to unstable extrusion volume; 2. Some materials are not completely melted in the barrel, thus clogging the filter screen of the die head and the mold flow channel, requiring frequent shutdowns for cleaning. Therefore, it is necessary to add a material mixing structure to ensure uniform mixing of plastic particles, such as the split-type mixer disclosed in utility model patent application number 201920670137.6. Extrusion extruders use a stirring screw inserted in the hopper to move the material from the bottom to the top of the hopper, thus mixing the materials and achieving the mixing of multiple materials. However, in this type of extruder, both the stirring screw and the extrusion screw are driven by the same motor and a bevel gear transmission structure to transmit power. This drive setup has the following disadvantages: 1. The speed of the stirring screw cannot be adjusted in real time according to the extrusion speed of the material; 2. The use of a multi-stage gear transmission structure leads to a complex structure, increases assembly and maintenance difficulty, and increases overall energy consumption. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a feeding and extrusion coordination unit that addresses the shortcomings of the prior art, and can adjust the stirring speed in real time according to the material extrusion requirements, thereby reducing overall energy consumption.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a feeding and extrusion coordination unit for an extruder, comprising a feeding hopper, a barrel located below the feeding hopper, and an extrusion screw located inside the barrel. A stirring seat is provided between the feeding hopper and the barrel. Two stirring screws are arranged horizontally side by side inside the stirring seat. A transmission component is provided at one end of the stirring screw extending outside the stirring seat to cause the two to rotate synchronously. A drive source is provided outside the stirring seat to drive one of the stirring screws to rotate around an axis. A stirring chamber is provided inside the stirring seat. The upper opening of the stirring chamber is connected to the discharge port of the feeding hopper, and the lower opening is connected to the feed groove on the barrel. The helical blades of the stirring screws are located inside the stirring chamber, and there is a gap between the helical blades of the two stirring screws.

[0005] The present invention, possessing the above-mentioned features, includes: a stirring screw installed between the feed hopper and the barrel to forcibly stir various solid plastics falling from the feed hopper, ensuring that the materials are fully mixed before entering the barrel; two stirring screws arranged side by side with gaps between the spiral blades, ensuring both stirring effect and preventing interference during screw rotation; the stirring screws are driven by independent drive sources, allowing for real-time adjustment of the stirring speed according to the material extrusion requirements; and the power transmission method for driving the two stirring screws is optimized, avoiding the complex structure of multi-stage transmission and reducing overall energy consumption.

[0006] A further feature of this invention is that the stirring base includes a detachably connected upper body and a lower body. An upper stirring groove is provided through the upper body. Two parallel first semicircular grooves are provided on both sides of the upper stirring groove. A second semicircular groove is provided on the outer periphery of both sides of the upper body corresponding to the first semicircular grooves. A lower stirring chamber is provided in the lower body. The upper stirring groove and the lower stirring chamber combine to form a stirring chamber. Two parallel third semicircular grooves are provided on both sides of the lower stirring chamber. A fourth semicircular groove is provided on the outer periphery of the lower body corresponding to the third semicircular grooves. The first and third semicircular grooves form a first mounting hole, and the second and fourth semicircular grooves form a second mounting hole. The rod of the stirring screw is located within the first and second mounting holes.

[0007] The present invention, which has the above features, has the following characteristics: the upper and lower seats are detachably connected and can be quickly separated to clean residual materials in the mixing chamber or replace the mixing screw; the mounting hole is formed by the combination of semi-circular grooves to form a circumferential limit for the mixing screw.

[0008] A further feature of this invention is that the bottom of the lower stirring chamber is provided with a material passage groove arranged along the axis of the stirring screw. The material passage groove divides the bottom of the lower stirring chamber into two symmetrical arc-shaped grooves. The spiral blades of the stirring screw are placed in the arc-shaped grooves. The material passage groove is the lower opening of the stirring chamber and is in contact with the feed groove of the material cylinder.

[0009] The present invention, which has the above features, has the following characteristics: the arc-shaped groove and the spiral blade cooperate to reduce the material flow resistance and improve the smoothness of conveying; the material passage groove fits into the feed groove of the material cylinder to ensure that the material falls accurately into the material cylinder.

[0010] A further feature of this invention is that: two spaced first mounting plates are integrally formed on the lower end surface of the lower seat body; a fifth semicircular groove is provided on the first mounting plate; a sixth semicircular groove is provided on the outer circumferential surfaces of both sides of the lower seat body along the axial direction of the stirring screw; two second mounting plates are provided below the material cylinder corresponding to the first mounting plates; a seventh semicircular groove is provided on the second mounting plates; the axis of the fifth and sixth semicircular grooves is located between the spiral blades of the two stirring screws; and the material cylinder is simultaneously located within the fifth, sixth, and seventh semicircular grooves.

[0011] The present invention, which has the above-mentioned features, achieves precise docking between the mixing seat and the material cylinder through the combination and positioning of multiple sets of semi-circular grooves, restricts the relative displacement of the material cylinder, avoids loosening of the connection due to vibration, ensures the alignment accuracy between the discharge port of the mixing chamber and the feed groove of the material cylinder, and prevents material leakage.

[0012] A further feature of this invention is that a thrust ring is installed in the first mounting hole, a bearing is installed in the second mounting hole, and the rod of the stirring screw passes through the thrust ring and the bearing.

[0013] The present invention, which has the above-mentioned features, restricts the axial movement of the stirring screw by means of a thrust ring and reduces the radial runout of the stirring screw by means of a bearing.

[0014] A further feature of this invention is that the stirring screw includes a first stirring screw and a second stirring screw, and the transmission assembly includes a driving gear mounted on the first stirring screw and a driven gear mounted on the second stirring screw, wherein the driving gear meshes with the driven gear.

[0015] The present invention, which has the above-mentioned features, has two stirring screws that rotate synchronously through gear meshing, thereby improving the uniformity of mixing; the gear meshing transmission method causes the two stirring screws to rotate in opposite directions, and the material is stirred in a bidirectional convection within the mixing chamber, further improving the uniformity of mixing.

[0016] A further feature of this invention is that the driving source is a motor, the output end of the motor is equipped with a first synchronous sprocket, the end of the first stirring screw located outside the stirring base is equipped with a second synchronous sprocket, and a chain is provided between the first synchronous sprocket and the second synchronous sprocket.

[0017] The present invention, which has the above features, has the following characteristics: the motor, as the drive source, can adjust the speed at any time to change the stirring speed to meet actual needs; the sprocket and chain transmission method has lower operating noise, reducing vibration and noise during equipment operation.

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

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the structure of the base and the stirring screw in an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the lower seat in an embodiment of the present invention.

[0022] Figure 4This is a schematic diagram of the upper seat body in an embodiment of the present utility model.

[0023] Figure 5 This is an exploded view of the feed hopper and mixing seat in an embodiment of this utility model.

[0024] Figure 6 This is a schematic diagram of the structure of the base and the material cylinder in an embodiment of this utility model.

[0025] Figure 7 This is a schematic diagram of the structure of the stirring base and stirring screw in an embodiment of the present invention. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings: like Figure 1-7 The feed and extrusion coordination unit of an extruder shown includes a feed hopper 1, a barrel 2 located below the feed hopper 1, and an extrusion screw 3 located inside the barrel 2. A stirring seat 4 is provided between the feed hopper 1 and the barrel 2. Two stirring screws 5 are arranged horizontally side by side inside the stirring seat 4. A transmission assembly is provided at one end of the stirring screw 5 extending outside the stirring seat 4 to cause the two to rotate synchronously. A drive source 6 is provided outside the stirring seat 4 to drive one of the stirring screws 5 to rotate around an axis. A stirring chamber 41 is provided inside the stirring seat 4. The upper opening of the stirring chamber 41 is connected to the discharge port 11 of the feed hopper 1, and the lower opening is connected to the feed groove 21 on the barrel 2. The helical blades 51 of the stirring screws 5 are located inside the stirring chamber 41, and there is a gap between the helical blades 51 of the two stirring screws 5.

[0027] The stirring base 4 includes a detachably connected upper body 42 and a lower body 43. The upper body 42 has an upper stirring groove 421 that runs through it. The two side walls of the upper stirring groove 421 have two parallel first semicircular grooves 422. The outer periphery of the two sides of the upper body 42 has a second semicircular groove 423 corresponding to the first semicircular groove 422. The lower body 43 has a lower stirring chamber 431. The upper stirring groove 421 and the lower stirring chamber 431 are combined to form a stirring chamber 41. The two side walls of the lower stirring chamber 431 have two parallel third semicircular grooves 432. The outer periphery of the lower body 43 has a fourth semicircular groove 433 corresponding to the third semicircular groove 432. The first semicircular groove 422 and the third semicircular groove 432 form a first mounting hole 44. The second semicircular groove 423 and the fourth semicircular groove 433 form a second mounting hole 45. The rod 52 of the stirring screw 5 is located in the first mounting hole 44 and the second mounting hole 45.

[0028] The bottom of the lower mixing chamber 431 is provided with a material passage 434 arranged along the axis of the mixing screw 5. The material passage 434 divides the bottom of the lower mixing chamber 431 into two symmetrical arc-shaped grooves 435. The spiral blades 51 of the mixing screw 5 are placed in the arc-shaped grooves 435. The material passage 434 is the lower opening of the mixing chamber 41 and is in contact with the feed groove 21 of the material cylinder 2.

[0029] The lower end face of the lower seat body 43 has two spaced first mounting plates 436 integrally formed. The first mounting plates 436 are provided with a fifth semi-circular groove 4361. The lower seat body 43 has a sixth semi-circular groove 437 on both outer circumferential surfaces along the axis of the stirring screw 5. The lower part of the material cylinder 2 is provided with two second mounting plates 7 corresponding to the first mounting plates 436. The second mounting plates 7 are provided with a seventh semi-circular groove 71. The axis of the fifth semi-circular groove 4361 and the sixth semi-circular groove 437 is located between the spiral blades 51 of the two stirring screws 5. The material cylinder 2 is simultaneously located in the fifth semi-circular groove 4361, the sixth semi-circular groove 437 and the seventh semi-circular groove 71.

[0030] A thrust ring 8 is installed in the first mounting hole 44, and a bearing 9 is installed in the second mounting hole 45. The rod 52 of the stirring screw 5 passes through the thrust ring 8 and the bearing 9.

[0031] The stirring screw 5 includes a first stirring screw 53 and a second stirring screw 54. The transmission assembly includes a drive gear 10 mounted on the first stirring screw 53 and a driven gear 12 mounted on the second stirring screw 54. The drive gear 10 meshes with the driven gear 12.

[0032] The drive source 6 is a motor. The output end of the motor is equipped with a first synchronous sprocket 13. The end of the first stirring screw 53 located outside the stirring base 4 is equipped with a second synchronous sprocket 14. A chain 15 is provided between the first synchronous sprocket 13 and the second synchronous sprocket 14.

[0033] During production, various solid plastics are poured into the feed hopper, the motor is started, and the dual agitator screws rotate under the motor's drive. Because the dual agitator screws are driven by gears, their directions are opposite, resulting in uniform mixing of the solid plastics. The mixed material then enters the barrel through the feed chute and is extruded by the extrusion screw inside the barrel after heating. Since the agitator screw and the extrusion screw use different drive sources, the speed of the agitator screw can be adjusted according to actual conditions. When there is too much material extruded from the barrel, the motor speed can be reduced to prevent overload; when there is too little material extruded from the barrel, the motor speed can be increased to increase output.

Claims

1. A feeding and extrusion coordination unit for an extruder, comprising a feed hopper, a barrel located below the feed hopper, and an extrusion screw located inside the barrel, characterized in that: A stirring seat is provided between the feed hopper and the material cylinder. Two stirring screws are arranged side by side horizontally inside the stirring seat. A transmission component is provided on one end of the stirring screws extending outside the stirring seat to make the two rotate synchronously. A drive source is provided outside the stirring seat to drive one of the stirring screws to rotate around an axis. A stirring chamber is provided inside the stirring seat. The upper opening of the stirring chamber is connected to the discharge port of the feed hopper, and the lower opening is connected to the feed groove on the material cylinder. The helical blades of the stirring screws are located inside the stirring chamber, and there is a gap between the helical blades of the two stirring screws.

2. The feeding and extrusion coordination unit of an extruder according to claim 1, characterized in that: The stirring base includes a detachably connected upper body and a lower body. The upper body has an upper stirring groove that runs through it. The two side walls of the upper stirring groove have two parallel first semicircular grooves. The outer circumference of the two sides of the upper body has a second semicircular groove corresponding to the first semicircular groove. The lower body has a lower stirring chamber. The upper stirring groove and the lower stirring chamber are combined to form a stirring chamber. The two side walls of the lower stirring chamber have two parallel third semicircular grooves. The outer circumference of the lower body has a fourth semicircular groove corresponding to the third semicircular groove. The first semicircular groove and the third semicircular groove form a first mounting hole. The second semicircular groove and the fourth semicircular groove form a second mounting hole. The rod of the stirring screw is located in the first mounting hole and the second mounting hole.

3. The feeding and extrusion coordination unit of an extruder according to claim 2, characterized in that: The bottom of the lower mixing chamber is provided with a material passage groove arranged along the axis of the mixing screw. The material passage groove divides the bottom of the lower mixing chamber into two symmetrical arc-shaped grooves. The spiral blades of the mixing screw are placed in the arc-shaped grooves. The material passage groove is the lower opening of the mixing chamber and is in contact with the feed groove of the material cylinder.

4. The feeding and extrusion coordination unit of an extruder according to claim 2, characterized in that: Two spaced first mounting plates are integrally formed on the lower end surface of the lower seat body. The first mounting plates are provided with a fifth semicircular groove. The outer circumferential surfaces of both sides of the lower seat body along the axial direction of the stirring screw are provided with a sixth semicircular groove. Two second mounting plates are provided below the material cylinder corresponding to the first mounting plates. The second mounting plates are provided with a seventh semicircular groove. The axis of the fifth semicircular groove and the sixth semicircular groove is located between the spiral blades of the two stirring screws. The material cylinder is located in the fifth semicircular groove, the sixth semicircular groove and the seventh semicircular groove.

5. The feeding and extrusion coordination unit of an extruder according to claim 2, characterized in that: A thrust ring is installed in the first mounting hole, and a bearing is installed in the second mounting hole. The rod of the stirring screw passes through the thrust ring and the bearing.

6. A feeding and extrusion coordination unit for an extruder according to any one of claims 1-5, characterized in that: The stirring screw includes a first stirring screw and a second stirring screw, and the transmission assembly includes a driving gear mounted on the first stirring screw and a driven gear mounted on the second stirring screw, wherein the driving gear meshes with the driven gear.

7. The feeding and extrusion coordination unit of an extruder according to claim 6, characterized in that: The driving source is a motor, and a first synchronous sprocket is installed at the output end of the motor. A second synchronous sprocket is installed at the end of the first stirring screw located outside the stirring base. A chain is provided between the first synchronous sprocket and the second synchronous sprocket.

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