Novel extruder screw

Abstract

The utility model discloses a novel extruder screw, which sequentially comprises a rotary mounting section, a spline transmission section, a thread sealing section, a material spiral conveying section, a material spiral extruding section and a pointed-end plugging section from left to right, and cooling channels are arranged in the pointed-end plugging section and the material spiral extruding section along the central line direction. A water return channel is formed in the rotary installation section, the spline transmission section, the thread sealing section and the material spiral conveying section in the center line direction, the diameter of the cooling channel is larger than that of the water return channel, and a right end opening of the cooling channel and a left end opening of the water return channel are in transition communication through a big-left-and-small-right conical hole. And a cooling water inlet pipe is coaxially arranged in the cooling channel and the water return channel. By changing the shape of the head of the screw body and improving the cooling channel in the screw body, the problems that materials at the head of the screw body are not easy to extrude out of a filtering honeycomb plate and are aged, and the materials are easy to age and stick to the screw due to high temperature of a material screw extrusion section and insufficient cooling capacity of cooling water are effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of PVC calendering film production, and specifically relates to a novel extruder screw. Background Art

[0002] The screw is an important part of the extruder. The structure of the traditional screw has the following problems in actual operation:

[0003] 1) The tip of the screw head coincides with the center line, that is, the tip of the screw head is not eccentric, so the extruded material is easy to wrap around the tip of the head and rotate at this position, and the material is difficult to get out of the filter honeycomb filter plate, which will cause the friction of the material in contact with the tip of the head to increase, generate too much heat and age. The older the material is, the softer it is, and the less material is discharged, which is a vicious cycle.

[0004] 2) Secondly, the water holes inside the screw have small diameters and are consistent from front to back, which cannot meet the demand for a large amount of cooling water generated by the large amount of shear heat generated in the screw extrusion section near the tip. Utility Model Content

[0005] The utility model aims to provide a novel extruder screw, which effectively solves the problems that the material at the screw head is not easy to extrude and ages, and the material is easy to age and stick to the screw due to high temperature in the screw extrusion section and insufficient cooling capacity of cooling water.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme: a new type of extruder screw, including a screw body horizontally arranged along the left and right directions, the screw body is composed of a rotating installation section, a spline transmission section, a threaded sealing section, a material spiral conveying section, a material spiral extrusion section and a pointed sealing section from right to left, a cooling channel is opened inside the pointed sealing section and the material spiral extrusion section along the center line direction, a return water channel is opened inside the rotating installation section, the spline transmission section, the threaded sealing section and the material spiral conveying section along the center line direction, the diameter of the cooling channel is larger than the diameter of the return water channel, the right port of the cooling channel and the left port of the return water channel are connected through a tapered hole with a larger left hole and a smaller right hole, and a cooling water inlet pipe is coaxially arranged in the cooling channel and the return water channel.

[0007] A spiral water return groove is provided in the inner circle of the cooling channel along the axial direction, and the spiral direction of the spiral water return groove is opposite to the spiral direction of the spiral extrusion section of the material.

[0008] The tip of the left side of the pointed sealing section is eccentrically set, and an external threaded sleeve is integrally provided at the right end of the pointed sealing section. The inner circle of the left port of the material spiral extrusion section is provided with an internal threaded section with a diameter larger than that of the cooling channel. The external threaded sleeve extends into and is threadedly connected to the internal threaded section. The annular connecting seam formed by the right end of the pointed sealing section and the left end of the material spiral extrusion section is beveled and welded as a whole.

[0009] The wall thickness of the left end face of the pointed sealing section is uniform.

[0010] By adopting the above technical solution, the rotating installation section at the right end of the utility model is installed in the gear box (gearbox), the external spline of the spline transmission section meshes with the internal spline of the inner circle of the output gear in the gear box, and the thread sealing section, the material spiral conveying section, the material spiral extrusion section and the pointed plugging section are coaxially arranged in the barrel of the extruder. The left end face of the barrel is butted against the right end face of the die head, and a filter honeycomb plate is arranged in the die head. The tip of the pointed plugging section has a gap with the right side face of the filter honeycomb plate in the axial direction and is eccentrically arranged in the radial direction. The right end of the cooling water inlet pipe extends out of the right end of the screw body (gear box) and is connected to a rotary joint. High-pressure cooling water is supplied to the cooling water inlet pipe through the rotary joint. The left port of the cooling water inlet pipe injects cooling water into the pointed plugging section, and directly impacts the cold water to the inner wall of the eccentric tip of the pointed plugging section to cool the pointed plugging section. The cooling water moves to the right in the cooling channel and also cools the spiral extrusion section of the material. Since a spiral return water groove is provided along the axial direction of the inner circle of the cooling channel in the opposite direction of the spiral extrusion section of the material, the cooling water rotates to the right along the spiral return water groove, and the return water is easier and smoother. After cooling the spiral extrusion section of the material, the cooling water transitions to the return water channel through the tapered hole and is discharged from the extruder to the right.

[0011] The screw body in the utility model adopts a split structure, that is, the pointed sealing section is processed separately, and after the integrated external threaded sleeve at the right end of the pointed sealing section is threadedly connected with the left port of the material spiral extrusion section, the annular connecting seam formed by the right end of the pointed sealing section and the left end of the material spiral extrusion section is beveled and welded as a whole, and finally the annular weld is polished and chrome-plated.

[0012] The tip of the left side of the pointed plugging section is eccentrically arranged. When the screw body rotates, the eccentric pointed plugging section exerts a certain axial force on the material at the center of the right side of the filter honeycomb plate, making it easier to squeeze the material out of the filter honeycomb plate to the left.

[0013] The diameter of the cooling channel in the screw body is increased, the amount of cooling water is large, and the wall of the screw body at the cooling channel is thin, which can achieve strong cooling and improve the cooling effect, thereby reducing the temperature of the material at the material spiral extrusion section.

[0014] The spiral water return groove arranged on the inner wall of the cooling channel has a rotation direction opposite to the spiral direction of the outer circle of the screw body, which is conducive to the smooth discharge of cooling water inside the cooling channel to the right, and can also make the material passing through the outer circle of the cooling channel cooler more evenly.

[0015] The wall thickness of the left end face of the pointed plugging section is uniform, so that when cooling water is sprayed onto the inner wall of the pointed plugging section, the temperature of the molten material transmitted to the outside through the wall thickness of the left end face of the pointed plugging section remains basically consistent.

[0016] After working for a long time, the inside of the cooling channel is prone to scaling. During maintenance, the cooling water inlet pipe can be drawn out, and a long rod with a crushing head at the end can be used to extend into the cooling channel for descaling.

[0017] In summary, the utility model has a scientific principle and a simple structure. By changing the shape of the screw body head and improving the cooling channel inside the screw body, the problem of the material at the head of the screw body being difficult to extrude and ageing due to the filtering honeycomb plate and the problem of the material being easy to age and stick to the screw due to the high temperature of the spiral extrusion section of the material and insufficient cooling capacity of the cooling water is effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the plane structure of the utility model;

[0019] Figure 2 yes Figure 1 Enlarged view of the middle tip occlusion segment. DETAILED DESCRIPTION

[0020] The implementation of the utility model is further described in detail below in conjunction with the drawings and examples.

[0021] like Figure 1 and Figure 2 As shown, a new type of extruder screw of the utility model comprises a screw body horizontally arranged along the left and right directions, and the screw body comprises a rotating installation section 1, a spline transmission section 2, a thread sealing section 3, a material spiral conveying section 4, a material spiral extrusion section 5 and a pointed plugging section 6 from right to left, a cooling channel 7 is opened inside the pointed plugging section 6 and the material spiral extrusion section 5 along the center line direction, a return water channel 8 is opened inside the rotating installation section 1, the spline transmission section 2, the thread sealing section 3 and the material spiral conveying section 4 along the center line direction, the diameter of the cooling channel 7 is larger than the diameter of the return water channel 8, the right port of the cooling channel 7 and the left port of the return water channel 8 are transitionally connected through a tapered hole 9 with a larger left hole and a smaller right hole, and a cooling water inlet pipe 10 is coaxially arranged in the cooling channel 7 and the return water channel 8.

[0022] A spiral water return groove 11 is provided in the inner circle of the cooling channel 7 along the axial direction, and the spiral direction of the spiral water return groove 11 is opposite to the spiral direction of the material spiral extrusion section 5 .

[0023] The tip 12 on the left side of the pointed sealing section 6 is eccentrically arranged, and an external threaded sleeve 13 is integrally provided at the right end of the pointed sealing section 6. An internal threaded section with a diameter greater than that of the cooling channel 7 is provided at the inner circle of the left port of the material spiral extrusion section 5. The external threaded sleeve 13 extends into and is threadedly connected to the internal threaded section. The annular connecting seam formed by the right end of the pointed sealing section 6 and the left end of the material spiral extrusion section 5 is beveled and welded as a whole.

[0024] The wall thickness of the left end surface of the pointed plugging section 6 is uniform.

[0025] The rotating installation section 1 at the right end of the utility model is installed in the gear box (gearbox), the external spline of the spline transmission section 2 is meshed and driven with the internal spline of the inner circle of the output gear in the gear box, and the thread sealing section 3, the material spiral conveying section 4, the material spiral extrusion section 5 and the pointed plugging section 6 are coaxially arranged in the barrel of the extruder. The left end face of the barrel is butted against the right end face of the die head, and a filter honeycomb plate is arranged in the die head. The tip 12 of the pointed plugging section has a gap with the right side face of the filter honeycomb plate in the axial direction and is eccentrically arranged in the radial direction. The right end of the cooling water inlet pipe 10 extends out of the right end of the screw body (gear box) and is connected to a rotary joint. High-pressure cooling water is supplied to the cooling water inlet pipe 10 through the rotary joint. The left port of the cooling water inlet pipe 10 injects cooling water into the pointed plugging section 6, and directly impacts the cold water to the inner wall of the eccentric tip 12 of the pointed plugging section 6 to cool the pointed plugging section 6. The cooling water moves to the right in the cooling channel 7, and the material spiral extrusion section 5 is also cooled. Since the inner circle of the cooling channel 7 is provided with a spiral return water groove 11 in the opposite direction of the spiral direction of the material spiral extrusion section 5 along the axial direction, the cooling water rotates to the right along the spiral return water groove 11, and the return water is easier and smoother. After cooling the material spiral extrusion section 5, the cooling water transitions to the return water channel 8 through the tapered hole 9 and is discharged from the extruder to the right.

[0026] The screw body in the utility model adopts a split structure, that is, the pointed plugging section 6 is processed separately, and after the integrated external threaded sleeve 13 at the right end of the pointed plugging section 6 is threadedly connected to the left port of the material spiral extrusion section 5, the annular connecting seam formed by the right end of the pointed plugging section 6 and the left end of the material spiral extrusion section 5 is beveled and welded as a whole, and finally the annular weld is polished and chrome-plated.

[0027] The tip 12 on the left side of the pointed plugging section 6 is eccentrically arranged. When the screw body rotates, the eccentric pointed plugging section 6 applies a certain axial force to the material at the right center of the filter honeycomb plate, making it easier to squeeze the material out of the filter honeycomb plate to the left.

[0028] The diameter of the cooling channel 7 in the screw body is increased, the amount of cooling water is large, and the wall of the screw body at the cooling channel 7 is thin, which can achieve strong cooling and improve the cooling effect, thereby reducing the temperature of the material at the material spiral extrusion section 5.

[0029] The spiral water return groove 11 arranged on the inner wall of the cooling channel 7 has a spiral direction opposite to the spiral direction of the outer circle of the screw body, which is conducive to the smooth discharge of cooling water inside the cooling channel 7 to the right, and can also make the material passing through the outer circle of the cooling channel 7 cool more evenly.

[0030] After working for a long time, the inside of the cooling channel 7 is prone to scaling. During maintenance, the cooling water inlet pipe 10 can be drawn out, and a long rod with a crushing head at the end can be used to extend into the cooling channel 7 for descaling.

[0031] The above embodiments illustrate the basic principles and features of the utility model, but the above only illustrates the preferred embodiments of the utility model and is not limited by the embodiments. Under the inspiration of this patent, ordinary technicians in this field can also make many forms of deformation and improvement without departing from the purpose of the utility model and the scope of protection of the claims, which are all within the scope of protection of the utility model. Therefore, the patent and protection scope of the utility model shall be subject to the attached claims.

Claims

1. A novel extruder screw, comprising a screw body horizontally arranged in the left-right direction, wherein the screw body is composed of a rotating installation section, a spline transmission section, a thread sealing section, a material spiral conveying section, a material spiral extrusion section and a pointed plugging section from right to left, characterized in that: A cooling channel is opened inside the pointed sealing section and the material spiral extrusion section along the center line direction, and a return water channel is opened inside the rotating installation section, the spline transmission section, the threaded sealing section and the material spiral conveying section along the center line direction. The diameter of the cooling channel is larger than the diameter of the return water channel. The right port of the cooling channel and the left port of the return water channel are connected through a tapered hole with a larger left hole and a smaller right hole. A cooling water inlet pipe is coaxially arranged in the cooling channel and the return water channel.

2. A novel extruder screw according to claim 1, characterized in that: A spiral water return groove is provided in the inner circle of the cooling channel along the axial direction, and the spiral direction of the spiral water return groove is opposite to the spiral direction of the spiral extrusion section of the material.

3. A novel extruder screw according to claim 1 or 2, characterized in that: The tip of the left side of the pointed sealing section is eccentrically set, and an external threaded sleeve is integrally provided at the right end of the pointed sealing section. The inner circle of the left port of the material spiral extrusion section is provided with an internal threaded section with a diameter larger than that of the cooling channel. The external threaded sleeve extends into and is threadedly connected to the internal threaded section. The annular connecting seam formed by the right end of the pointed sealing section and the left end of the material spiral extrusion section is beveled and welded as a whole.

4. A novel extruder screw according to claim 3, characterized in that: The wall thickness of the left end face of the pointed sealing section is uniform.

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