Screw extruding and filtering assembly of extruder

Abstract

The utility model discloses an extruding and filtering assembly for a screw rod of an extruding machine, which comprises a filtering honeycomb plate, a stainless steel filtering net, a pressing ring, a material guiding barrel and a machine barrel which are sequentially arranged from left to right, and a screw rod body is coaxially arranged in the machine barrel and the material guiding barrel. The screw body is sequentially provided with a rotary installation section, a spline transmission section, a thread sealing section, a material spiral conveying section, a material spiral extrusion section and a pointed end plugging section from right to left. The screw is scientific in principle and simple in structure, and the butt joint centrality and the sealing effect of all parts are improved by changing the shape of the head of the screw body, improving the cooling channel in the screw body, improving the structure of the filtering honeycomb plate and changing the position of the pressing ring. During maintenance, the pressing ring is taken out, waste is cleaned more conveniently and quickly, and the problems that materials at the head of the screw body are not prone to being extruded out of a filtering honeycomb plate to be aged, and materials are prone to being aged to adhere to the screw due to high temperature of a material spiral 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 in particular relates to an extruder screw extrusion filtering component. Background Art

[0002] The extruder used in the production of PVC calendered film artificial leather has the functions of evenly keeping the material warm and filtering impurities. The filter honeycomb plate and screw are important components of the extruder. The existing structure of the filter honeycomb plate and screw has the following disadvantages or shortcomings:

[0003] 1) The right end face of the pressure ring on the right side of the filter honeycomb plate in the die head is pressed against the left end face of the guide barrel in the die head under the locking action of the oblique iron of the die head, forming an end face seal to prevent the molten material from leaking out along the contact surface between the pressure ring and the guide barrel. Because the sealing surface is inside the die head (the left end of the guide barrel does not extend out of the left end of the die head, and the pressure ring is inside the die head), it is not easy to check whether the sealing surface is good or not. Moreover, once there is leakage on the sealing surface, the pressure ring is easily stuck to the inside of the die head by the leaked material, which increases the workload of removing the pressure ring and cleaning the scraps leaked into the annular step groove in the die head.

[0004] 2) 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 increase the friction of the material in contact with the tip of the head, 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;

[0005] 3) The water holes inside the screw have a small diameter 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

[0006] The utility model aims to provide an extruder screw extrusion filter assembly, which is easier for molten material to pass through a filtering honeycomb plate and has a good cooling effect on the screw end head, and a pressure ring is arranged inside a die head, and a butt joint between a right end face of the pressure ring and a left end face of a material guide barrel in the die head is located outside the die head, so that the pressure ring is easier to take out and the molten material is easier to clean when opening and closing the die head.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme: an extruder screw extrusion filter assembly, comprising a filter honeycomb plate, a stainless steel filter screen, a pressure ring, a guide barrel and a machine barrel arranged in sequence from left to right, a screw body is coaxially arranged in the machine barrel and the guide barrel, and the screw body is sequentially 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 plugging section from right to left, the filter honeycomb plate, the stainless steel filter screen and the pressure ring are all arranged in the die head of the extruder, the right outer circle of the filter honeycomb plate and the left end of the pressure ring are crimped with a stop structure, the circumferential edge of the stainless steel filter screen is crimped in the stop structure, the right end ring surface of the pressure ring protrudes from the right side surface of the die head, the left end ring surface of the guide barrel protrudes from the left end surface of the extruder head, and the right end ring surface of the pressure ring is correspondingly crimped with the left end ring surface of the guide barrel;

[0008] 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.

[0009] 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 material spiral extrusion section.

[0010] 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.

[0011] The wall thickness of the left end face of the pointed sealing section is uniform.

[0012] The inner diameter of the pressing ring is larger than the inner diameter of the guide tube.

[0013] With the above technical solution, the rotating installation section at the right end of the screw body is installed in the gearbox (gearbox), the external spline of the spline transmission section meshes with the internal spline of the inner circle of the output gear in the gearbox, and the thread sealing section, material spiral conveying section, material spiral extrusion section and 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.

[0014] On the extruder head connected by hinge rotation at the front or rear side of the die head, when the die head and the die head are buckled, the right end face of the pressure ring is sealed against the left end face of the guide barrel protruding from the left end of the die head. The inner diameter of the pressure ring is slightly larger than the inner diameter of the guide barrel, so that even if the pressure ring and the guide barrel have a slight non-concentric deviation, the pressure ring will not block the movement of the material from right to left, thereby avoiding the formation of a dead angle for filtration. In addition, when the die head is opened, due to the viscosity of the molten material, the pressure ring and the filter honeycomb plate are bonded together, so that the pressure ring and the die head are separated from the guide barrel together, and it is more convenient and quick to remove the pressure ring on the die head. The pressure ring and the guide barrel are sealed by flat crimping, and the annular sealing surface is outside the die head, and the molten material bonded here is also easy to clean.

[0015] The screw body adopts a split structure, that is, the pointed sealing section is processed separately. After the integrated external threaded sleeve at the right end of the pointed sealing section is threadedly connected to 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 together, and finally the annular weld is polished and chrome-plated.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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, ensuring that the molten material will not degrade and age due to over-temperature.

[0020] 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.

[0021] To sum up, the utility model has a scientific principle and a simple structure. By changing the shape of the head of the screw body, improving the cooling channel inside the screw body, improving the structure of the filter honeycomb plate, and changing the position of the pressure ring, the centrality and sealing effect of the docking between the components are improved. It is more convenient and quick to remove the pressure ring and clean up the waste during maintenance, and effectively solves the problem that the material at the head of the screw body is not easy to squeeze out of the filter honeycomb plate and age, and the material is 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the planar structure of the utility model installed on an extruder;

[0023] Figure 2 yes Figure 1 The enlarged view of point I in the middle;

[0024] Figure 3 yes Figure 1 Structural schematic diagram of the middle screw and cooling water inlet pipe;

[0025] Figure 4 yes Figure 3 Enlarged view of the middle tip occlusion segment. DETAILED DESCRIPTION

[0026] The implementation of the utility model is further described in detail below in conjunction with the drawings and examples.

[0027] like Figure 1-Figure 4As shown, the utility model is an extruder screw extrusion filter assembly, including a filter honeycomb plate 18, a stainless steel filter screen 19, a pressure ring 20, a guide barrel 28 and a barrel 29 arranged in sequence from left to right, a screw body 30 is coaxially arranged in the barrel 29 and the guide barrel 28, and the screw body 30 is sequentially composed of a rotation 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; the filter honeycomb plate 18, the stainless steel filter screen 19, the pressure ring 20, the guide barrel 28 and the barrel 29 are arranged coaxially. The stainless steel filter screen 19 and the pressure ring 20 are both arranged in the die head 14 of the extruder. The right outer circle of the filter honeycomb plate 18 and the left end of the pressure ring 20 are crimped with a stop structure. The circumferential edge of the stainless steel filter screen 19 is crimped in the stop structure. The right end ring surface of the pressure ring 20 protrudes from the right side surface of the die head 14, and the left end ring surface of the guide barrel 28 protrudes from the left end surface of the extruder head 31. The right end ring surface of the pressure ring 20 is correspondingly crimped with the left end ring surface of the guide barrel 28; the inner diameter of the pressure ring 20 is larger than the inner diameter of the guide barrel 28.

[0028] A cooling channel 7 is opened inside the pointed sealing section 6 and the material spiral extrusion section 5 along the center line direction, and a return water channel 8 is opened inside the rotating installation section 1, the spline transmission section 2, the threaded 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 end of the cooling channel 7 and the left end of the return water channel 8 are connected through a conical hole 9 with a larger left hole and a smaller right hole. A cooling water inlet pipe 10 is coaxially arranged in the cooling channel 7 and the return water channel 8.

[0029] 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 .

[0030] 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.

[0031] The wall thickness of the left end surface of the pointed plugging section 6 is uniform.

[0032] The rotating installation section 1 at the right end of the screw body 30 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 29 of the extruder. The left end face of the barrel 29 is connected to the right end face of the die head 14, and the die head 14 is provided with a filter honeycomb plate 18. The tip 12 of the pointed plugging section has a gap with the right side face of the filter honeycomb plate 18 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 30 (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.

[0033] On the die head 31 of the extruder connected by hinge rotation at the front or rear side of the die head 14, when the die head 14 is buckled with the die head 31, the right end face of the pressure ring 20 is butted and sealed with the left end face of the guide tube 28 protruding from the left end of the die head 31. The inner diameter of the pressure ring 20 is slightly larger than the inner diameter of the guide tube 28, so that even if the pressure ring 20 and the guide tube 28 have a slight non-concentric deviation, the pressure ring 20 will not block the movement of the material from right to left, thereby avoiding the generation of a filtering dead angle. In addition, when the die head 14 is opened, due to the viscosity of the molten material, the pressure ring 20 and the filter honeycomb plate 18 are bonded as one, so that the pressure ring 20 and the die head 14 are separated from the guide tube 28 together, and it is more convenient and quick to remove the pressure ring 20 from the die head 14. The pressure ring 20 and the guide tube 28 are sealed by a plane crimping, and the annular sealing surface is outside the die head 31, and the molten material bonded here is also convenient to clean.

[0034] The screw body 30 is made of a split structure, that is, the pointed sealing section 6 is processed separately, and after the integrated external threaded sleeve 13 at the right end of the pointed sealing 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 sealing section 6 and the left end of the material spiral extrusion section 5 is beveled and welded together, and finally the annular weld is polished and chrome-plated.

[0035] The tip 12 on the left side of the pointed sealing section 6 is eccentrically arranged. When the screw body 30 rotates, the eccentric pointed sealing section 6 applies a certain axial force to the material at the right center of the filter honeycomb plate 18, making it easier to squeeze the material out of the filter honeycomb plate 18 to the left.

[0036] The diameter of the cooling channel 7 in the screw body 30 is increased, the amount of cooling water is large, and the wall of the screw body 30 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.

[0037] 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 30, 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.

[0038] 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.

[0039] 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. An extruder screw extrusion filter assembly, comprising a filter honeycomb plate, a stainless steel filter screen, a pressure ring, a guide barrel and a barrel arranged in sequence from left to right, a screw body is coaxially arranged in the barrel and the guide barrel, and the screw body is sequentially 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: The filter honeycomb plate, the stainless steel filter screen and the pressure ring are all arranged in the die head of the extruder. The outer circle of the right side of the filter honeycomb plate and the left end of the pressure ring are crimped with a stop structure. The circumferential edge of the stainless steel filter screen is crimped in the stop structure. The right end ring surface of the pressure ring protrudes from the right side surface of the die head. The left end ring surface of the guide barrel protrudes from the left end surface of the extruder head. The right end ring surface of the pressure ring and the left end ring surface of the guide barrel are correspondingly crimped. 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. The extruder screw extrusion filter assembly 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. The extruder screw extrusion filter assembly according to claim 1, 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. The extruder screw extrusion filter assembly according to claim 3, characterized in that: The wall thickness of the left end face of the pointed sealing section is uniform.

5. An extruder screw extrusion filter assembly according to any one of claims 1 to 4, characterized in that: The inner diameter of the pressing ring is larger than the inner diameter of the guide tube.

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