New and old material feeding structure of extruder
By designing the feed structure of the old hopper and the new hopper in the extruder, using the input screw and the separation casing to ensure stable push of the old material and the separation of the new material, the old material is trapped and blocked in the discharge barrel. The problem of production stability and feeding volume have been improved.
Patent Information
- Application Number
- CN202411553552.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-02
- Publication Date
- 2024-12-31
AI Technical Summary
In film blowing equipment, old materials are difficult to fall in the extruder discharge barrel due to the fluffy state and friction resistance of the lightweight crushed film, which is prone to intermittent output and material blockage, which affects production stability.
A new and old material feed structure of an extruder including an old hopper and a new hopper is designed. The old hopper is equipped with a funnel section and a straight pipe section. The old material is pushed to the discharge through the conical and straight screw driven by the input screw motor. Inside the cylinder, and ensure that the new and old materials are separated from the feedstock through the separation casing and blanking pipe to avoid ups and blockages.
It effectively avoids the retention and blockage of old materials, ensures the stable input and mixing of old materials, and improves the stability of production and feeding volume, especially when the proportion of old materials is large.
Smart Images
Figure CN119217676A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of plastic extrusion equipment, in particular to a new and old material feeding structure of an extruder. Background Art
[0002] At present, film scraps are generated in the process of producing plastic film by film blowing equipment. After being processed by a pulverizer, the film scraps become lightweight pulverized film (old material). Since the lightweight pulverized film is in a fluffy state, it is very light compared to the same volume of pellets (new material). Film blowing equipment includes an extruder. The current production process is to mix the old material with the new material and then input it into the discharge barrel of the extruder. An extrusion screw is provided in the discharge barrel, and the rotation axis of the extrusion screw is located in the horizontal plane. Specifically, the feed port of the discharge barrel is connected to a new material funnel and an old material funnel. The purpose of setting the structure of the old material funnel with a larger top and a smaller bottom is to make the old material funnel have sufficient temporary storage capacity for the old material to avoid intermittent output of the old material. The old material is subject to the friction resistance of the inner wall of the old material funnel and the internal obstruction of the old material itself, which makes the old material incompatible. It is easy to fall to the feed port by gravity, so an old material screw is arranged in the old material funnel to push the old material into the discharge barrel. The old material screw is driven by a motor, but since there is a large space between the old material screw and the inner wall of the old material funnel, the old material that can contact the old material screw is easily pushed to the discharge barrel, but the old material on the outside of the old material funnel basically cannot get the thrust, resulting in the retention of old material in the old material funnel, which is easy to cause blockage at the entrance of the old material funnel, which is not conducive to stable production. It is necessary to improve the above-mentioned new and old material feeding structure. Summary of the invention
[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a new and old material feeding structure for an extruder, which is conducive to stable production.
[0004] The purpose of the present invention is achieved through the following technical solutions.
[0005] The new and old material feeding structure of the extruder disclosed in the present invention comprises an extruder discharge barrel, an extrusion screw is arranged in the extruder discharge barrel, and a barrel inlet is formed in the extruder discharge barrel; wherein, it also comprises an old hopper and a new hopper, the old hopper comprises a funnel portion and a straight tube portion, the lower end of the funnel portion is connected to the upper end of the straight tube portion, and the barrel inlet is connected to the lower end of the straight tube portion and the new hopper; it also comprises an input screw motor and a crushed film input screw for pushing the crushed film in the old hopper to the crushed film input screw in the extruder discharge barrel, the input screw motor drives the crushed film input screw to rotate, the crushed film input screw comprises a conical screw portion and a straight screw portion, the conical screw portion is adapted to be arranged in the funnel portion, and the straight screw portion is adapted to be arranged in the straight tube portion.
[0006] Preferably, the new and old material feeding structure of the extruder of the present invention also includes a separation sleeve, which is sleeved outside the straight pipe part, the lower end of the separation sleeve is connected to the barrel feeding port, and the upper part of the separation sleeve is connected to the new hopper.
[0007] Preferably, a top sealing plate is provided at the upper end of the separation sleeve, the straight pipe portion passes through the top sealing plate, and the new hopper is connected to the side wall of the separation sleeve through a drop pipe.
[0008] Preferably, the separation sleeve is a round tube, and the separation sleeve is coaxially arranged with the straight tube portion.
[0009] Preferably, the input screw motor is arranged on the upper side of the funnel portion.
[0010] Compared with the prior art, the present invention has the following beneficial effects: an old hopper is provided including a funnel portion and a straight tube portion, the lower end of the funnel portion is connected to the upper end of the straight tube portion, the barrel inlet is connected to the lower end of the straight tube portion and the old hopper, an input screw motor and a broken film input screw for pushing the broken film in the old hopper to the broken film discharge barrel of the extruder are provided, the input screw motor drives the broken film input screw to rotate, the broken film input screw includes a conical screw portion and a straight screw portion, the conical screw portion is adapted to be arranged in the funnel portion, and the straight screw portion is adapted to be arranged in the straight tube portion, thereby avoiding the retention of old material in the old hopper, and facilitating stable production. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the combination of the new and old material feeding structure and the crusher according to the first embodiment of the present invention.
[0012] Figure 2 It is a schematic diagram of the three-dimensional structure of the film input screw of the present invention.
[0013] Figure 3 It is a structural diagram of the first existing new and old material feeding structure.
[0014] Figure 4 It is a structural diagram of the second existing new and old material feeding structure.
[0015] Explanation of reference numerals: extruder discharge barrel 1; extrusion screw 11; barrel inlet 111; pulverizer 2; crushed film conveying channel 21; crushed film input screw 3; conical screw portion 301; straight screw portion 302; rotating shaft 300; input screw motor 31; old hopper 32; funnel portion 321; straight tube portion 322; new hopper 4; drop pipe 41; separation sleeve 5; top sealing plate 51. DETAILED DESCRIPTION
[0016] The present invention will be further described below in conjunction with the accompanying drawings.
[0017] The new and old material feeding structure of the extruder of the present invention is as follows: Figure 1 As shown, the extruder discharge barrel 1 includes an extruder discharge barrel 1, which is a component of the extruder. The structural principle of the extruder can refer to the Chinese utility model patent publication number CN203246062U "Plastic Extruder". The extruder discharge barrel 1 is provided with an extrusion screw 11, and the extruder is also provided with an extrusion screw motor. The extrusion screw motor drives the extrusion screw 11 to rotate, so that the extrusion screw 11 can extrude the raw materials in the extruder discharge barrel 1. Figure 1 As shown, the extruder discharge barrel 1 is formed with a barrel inlet 111, and the barrel inlet 111 is located at the top of the extruder discharge barrel 1. Figure 1 As shown, the old and new material feeding structure of the extruder of the present invention also includes an old hopper 32 and a new hopper 4. The old hopper 32 includes a funnel portion 321 and a straight tube portion 322. In other words, the inner cavity of the funnel portion 321 is larger at the top and smaller at the bottom. The funnel portion 321 is preferably in an inverted cone shape. The lower end of the funnel portion 321 is connected to the upper end of the straight tube portion 322. In other words, the inner diameter of the lower end of the funnel portion 321 is equal to the inner diameter of the straight tube portion 322. The barrel feed port 111 is connected to the lower end of the straight tube portion 322 and the new hopper 4, that is, the barrel feed port 111 is connected to the inner cavity of the old hopper 32 through the lower end of the straight tube portion 322. The broken film is transported to the extruder discharge barrel 1 through the old hopper 32 and the barrel feed port 111. Figure 1 As shown, the new and old material feeding structure of the extruder of the present invention also includes an input screw motor 31 and a broken film input screw 3 for pushing the broken film in the old material hopper 32 to the broken film input screw 3 in the extruder discharge barrel 1. The input screw motor 31 drives the broken film input screw 3 to rotate. The broken film input screw 3 includes a conical screw portion 301 and a straight screw portion 302. The conical screw portion 301 is adapted to be arranged in the funnel portion 321, and the straight screw portion 302 is adapted to be arranged in the straight tube portion 322. The structural principle of the broken film input screw 3 can refer to the "screw conveying dragon" in the Chinese utility model patent publication number CN216992527U "an automatic feeding mechanism for cement mortar preparation". Specifically, the broken film input screw 3 also includes a rotating shaft 300, the upper end of the rotating shaft 300 is connected to the output rotating shaft of the input screw motor 31, and a spiral blade is wound on the rotating shaft 300. The radial inner end of the spiral blade is welded against the rotating shaft 300, wherein, as Figure 2 As shown (it should be noted that Figure 2 The rotating shaft 300 is not shown. The width of the spiral blades of the conical screw portion 301 (i.e. Figure 2 The dimension "W" in the figure is gradually reduced from top to bottom, so that the outer shape of the conical screw portion 301 is an inverted cone, such as Figure 1As shown, the conical screw portion 301 can be adapted to the inner cavity shape of the funnel portion 321, that is, the radial outer end of the spiral blade of the conical screw portion 301 can be arranged close to the inner wall of the funnel portion 321, specifically, a gap of 3 mm to 5 mm can be left between the radial outer end of the spiral blade of the conical screw portion 301 and the inner wall of the funnel portion 321; thereby, the thrust void area in the funnel portion 321 is greatly reduced, and the old material (lightweight crushed film) in the funnel portion 321 is pushed downward directly by the conical screw portion 301 as much as possible.
[0018] like Figure 1 As shown, the output end of the pulverizer 2 is connected to the upper end of the funnel part 321 through the broken film conveying channel 21, wherein the broken film conveying channel 21 can use airflow to convey old materials (an exhaust mesh port can be set in the funnel part 321), and the conical screw part 301 pushes the old materials downward to the straight tube part 322 when rotating, and the straight screw part 302 pushes the old materials in the straight tube part 322 into the extruder discharge barrel 1 (through the barrel inlet 111), and injects new materials (plastic pellets) into the new hopper 4. The new materials fall to the barrel inlet 111 and fall onto the extrusion screw 11 by gravity, and the extrusion screw 11 rotates to push the new materials and old materials entering the extruder discharge barrel 1 to the extrusion die of the extruder, during which the extrusion screw 11 plays a mixing role on the new materials and old materials. As can be seen from the above, by setting the film input screw 3 of the present invention, the retention of old materials in the old hopper 32 can be avoided, which is conducive to stable production.
[0019] Furthermore, if Figure 1As shown, the new and old material feeding structure of the extruder of the present invention also includes a separation sleeve 5, which is sleeved outside the straight tube portion 322, and the lower end of the separation sleeve 5 is connected to the barrel feed port 111, and the upper part of the separation sleeve 5 is connected to the new hopper 4. In other words, the new hopper 4 is connected to the barrel feed port 111 through the separation sleeve 5, and the new material passes between the inner wall of the separation sleeve 5 and the outer wall of the straight tube portion 322 and directly enters the extruder discharge barrel 1, and the straight tube portion 322 is connected at the barrel feed port 111, and the old material directly enters the extruder discharge barrel 1 through the straight tube portion 322. That is to say, the mutual inner and outer fitting structure of the separation sleeve 5 and the straight tube portion 322 realizes that the new material and the old material are in a separated state before entering the barrel feed port 111, and the new material and the old material independently enter the extrusion screw 11 position in the extruder discharge barrel 1, and the new material and the old material are in the extruder discharge barrel. 1, due to the rotation of the extrusion screw 11, rapid mixing is achieved, which prevents the old material from floating above the new material due to its lighter weight, thereby preventing the old material from being blocked from entering the extruder discharge barrel 1, which is beneficial to the stability of the feed amount of the extruder discharge barrel 1; during this period, if too little old material enters the extruder discharge barrel 1, or because the old material is in the form of broken fragments or there is electrostatic repulsion between the fragmented old material, the old material that enters may still float or have holes / cavities. However, in the present technical solution, the new material is separated from the old material and directly enters the extruder discharge barrel 1 through the separation sleeve 5. In this case, since the new material and the old material are in different physical forms, the new material can quickly fill the holes / cavities of the old material that enters, further ensuring the stability of the feed amount of the extruder discharge barrel 1 and avoiding the hollowing phenomenon that occurs during the mixing process. In contrast, assuming that the new material and the old material are pre-intersected outside the extruder discharge barrel 1, as shown in FIG. Figure 3 As shown, for example, the new hopper is connected to the lower part of the old hopper, the new material is mixed into the old material, and the screw in the old hopper can effectively inject the new material into the extruder discharge barrel 1, but because the old material is significantly lighter than the new material, the old material will float up, resulting in poor feeding of the old material, and may also cause the screw in the old hopper to be stuck due to rotation obstruction; Figure 4 As shown, assuming that the new hopper is connected to the lower part of the old hopper and the discharge port of the new hopper is located at the corresponding position of the screw in the old hopper, that is, the screw in the old hopper can directly drive the new material to be injected into the extruder discharge barrel 1. The above structure makes it easier for the new material to enter the extruder discharge barrel 1, but the amount of old material that can enter the extruder discharge barrel 1 is even less.
[0020] Furthermore, if Figure 1As shown, the upper end of the separation sleeve 5 is provided with a top sealing plate 51, and the straight pipe portion 322 passes through the top sealing plate 51. The new material hopper 4 is connected to the side wall of the separation sleeve 5 through the drop pipe 41. Therefore, when the separation sleeve 5 is full of material, the new material will not overflow from the upper end of the separation sleeve 5. Since the new material hopper 4 is connected to the side wall of the separation sleeve 5 through the drop pipe 41, it is convenient to make the drop pipe 41 and the separation sleeve 5 form an acute angle. When the new material falls by gravity and is discharged into the separation sleeve 5, as shown in FIG. Figure 1 As shown, the new material will move to the left due to inertia, which is conducive to the new material surrounding the old material at the barrel inlet 111, which is conducive to improving the mixing effect of the new material and the old material. Assuming that the structure of the separation sleeve 5 is removed, and two new material outlets are formed at the lower end of the drop tube 41, and the two new material outlets are respectively located on both sides of the straight tube portion 322, it is not easy to form the above-mentioned effect of the new material surrounding the old material.
[0021] Furthermore, the separating sleeve 5 is a circular tube, and the separating sleeve 5 is coaxially arranged with the straight tube portion 322. In other words, the straight tube portion 322 is also arranged as a circular tube. Since the straight tube portion 322 is arranged as a circular tube, a dead angle between the straight screw portion 302 and the inner wall of the straight tube portion 322 can be avoided. The separating sleeve 5 is coaxial with the straight tube portion 322, which is beneficial to improving the uniform mixing effect of the new material and the old material.
[0022] Furthermore, if Figure 1 As shown, the input screw motor 31 is arranged on the upper side of the funnel portion 321. For example, a cover plate may be formed at the upper end of the funnel portion 321, and a waste material feed port may be formed on the cover plate. The waste material feed port is connected to the broken film conveying channel 21. The input screw motor 31 may be installed on the cover plate by fasteners, and the output shaft of the input screw motor 31 passes through the cover plate. Therefore, arranging the input screw motor 31 on the upper side of the funnel portion 321 is beneficial to simplifying the transmission structure.
[0023] In summary, the new and old material feeding structure of the extruder of the present invention is conducive to the stable entry of old material into the extruder discharge barrel 1, which can avoid blockage and is conducive to ensuring the amount of old material input into the extruder discharge barrel 1, and is particularly suitable for occasions where the proportion of old material is large.
Claims
1. A new and old material feeding structure of an extruder, comprising an extruder discharge barrel (1), wherein an extrusion screw (11) is arranged inside the extruder discharge barrel (1), and a barrel inlet (111) is formed on the extruder discharge barrel (1), characterized in that: The invention also comprises an old hopper (32) and a new hopper (4), wherein the old hopper (32) comprises a funnel portion (321) and a straight tube portion (322), wherein the lower end of the funnel portion (321) is connected to the upper end of the straight tube portion (322), and the barrel inlet (111) is connected to the lower end of the straight tube portion (322) and the new hopper (4); and an input screw motor (31) and a crushed film input screw (3) for pushing the crushed film in the old hopper (32) into the crushed film discharge barrel (1) of the extruder, wherein the input screw motor (31) drives the crushed film input screw (3) to rotate, wherein the crushed film input screw (3) comprises a conical screw portion (301) and a straight screw portion (302), wherein the conical screw portion (301) is adapted to be arranged in the funnel portion (321), and the straight screw portion (302) is adapted to be arranged in the straight tube portion (322).
2. The new and old material feeding structure of the extruder according to claim 1 is characterized in that: It also comprises a separation sleeve (5), the separation sleeve (5) being sleeved outside the straight pipe portion (322), the lower end of the separation sleeve (5) being connected to the barrel feed port (111), and the upper part of the separation sleeve (5) being connected to the new hopper (4).
3. The new and old material feeding structure of the extruder according to claim 2 is characterized in that: A top sealing plate (51) is provided at the upper end of the separation sleeve (5), the straight pipe portion (322) passes through the top sealing plate (51), and the new hopper (4) is connected to the side wall of the separation sleeve (5) via a drop pipe (41).
4. The new and old material feeding structure of the extruder according to claim 3 is characterized in that: The separation sleeve (5) is a circular tube, and the separation sleeve (5) is coaxially arranged with the straight tube portion (322).
5. The new and old material feeding structure of the extruder according to any one of claims 1 to 4, characterized in that: The input screw motor (31) is arranged on the upper side of the funnel portion (321).