Die assembly of screw extruder

Abstract

The utility model relates to the technical field of extruders, and discloses a die assembly of a screw extruder, which comprises a die and a blowing assembly, the mouth mold is provided with a plurality of discharge holes which are transversely distributed at intervals; the air blowing assembly comprises an air blowing pipe which is provided with air blowing holes. Air blowing pipes are arranged on the upper side and the lower side of the discharging hole, the air blowing holes face the discharging hole, and the air blowing pipes are used for blowing air to the discharging hole so as to remove precipitates on the edge of the discharging hole; the screw extruder die assembly is applied to the screw extruder, high-pressure airflow is input into the air blowing pipe, and the high-pressure airflow is output from the air blowing hole and blows towards the discharge hole, so that precipitates at the edge of the discharge hole are removed, compared with manual precipitate removal, the screw extruder does not need to be shut down and re-braced, material waste can be avoided, and the production efficiency is improved. The labor intensity is reduced; in addition, blowing pipelines are arranged on the upper side and the lower side of the discharging hole, the upper edge and the lower edge of the discharging hole can be blown by airflow, and the removal effect of precipitates can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a die assembly for a screw extruder. Background Art

[0002] Currently, phosphorus-based flame-retardant reinforced PA / PBT composite materials are typically produced using a co-rotating twin-screw extruder. The composite material is extruded into strips through the die of the screw extruder and then pelletized into pellets by pulling the strands. However, during the extrusion process, some polymers in the composite material inevitably undergo thermal decomposition. The decomposed material adheres to the outlet edge of the screw extruder die and gradually turns yellow and black in a hot, oxidative environment, forming carbides. Carbides carried into the finished product can cause color inconsistencies and decreased performance when the finished product is injection molded. Therefore, carbides are generally removed by manual, periodic cleaning. However, this method requires interrupting production and then re-pulling the strands after cleaning. This removal method not only results in significant material waste but also increases labor intensity. Utility Model Content

[0003] The purpose of the utility model is to provide a screw extruder die assembly, which can promptly remove precipitates from the edge of the die outlet without interrupting production, thereby avoiding material waste and reducing labor intensity.

[0004] In order to achieve the above object, the utility model provides a screw extruder die assembly, comprising a die and a blowing assembly;

[0005] The die has a plurality of discharge holes arranged at intervals in a transverse direction;

[0006] The blowing assembly includes a blowing pipe having a blowing hole;

[0007] The blowing pipes are provided on the upper and lower sides of the discharge hole, the blowing holes are facing the discharge hole, and the blowing holes are spaced apart from the discharge hole. The blowing holes are used to blow air toward the discharge hole to remove precipitates on the edge of the discharge hole.

[0008] In a specific embodiment of the present invention, the blowing assembly further comprises a first mounting seat and a second mounting seat, both of which are mounted on the die, and the first mounting seat and the second mounting seat are arranged laterally and spaced apart on the surface where the discharge end of the discharge hole is located;

[0009] All the discharge holes are located between the first mounting seat and the second mounting seat;

[0010] The two ends of the air blowing pipe along the length direction are respectively mounted on the first mounting seat and the second mounting seat.

[0011] In a specific embodiment of the present invention, the first mounting seat and the second mounting seat both have a fixing ring, and the first mounting seat and the second mounting seat both fix the air blowing pipe through the fixing ring.

[0012] In a specific embodiment of the present invention, the outer peripheral wall of the fixing ring is provided with a connecting hole, and the connecting hole is connected to the annular hole of the fixing ring;

[0013] The blowing assembly further includes a fastening adjustment member, which passes through the connecting hole and is connected to the hole wall of the connecting hole. One end of the fastening adjustment member located in the ring hole of the fixing ring is tightly pressed against the outer peripheral wall of the blowing pipe.

[0014] In a specific embodiment of the present invention, the first mounting seat and the second mounting seat are detachably mounted on the die.

[0015] In a specific embodiment of the present invention, an air intake assembly is further included. The air intake assembly includes an air intake pipe and an air source. The air intake pipe is connected to the air blowing pipe and the air source.

[0016] In a specific embodiment of the present invention, the air intake assembly further includes an air pressure control component, and the air pressure control component is connected to the air intake pipe.

[0017] In a specific embodiment of the present invention, the gas source is one of nitrogen production equipment, nitrogen storage equipment, and an air compressor.

[0018] The embodiment of the present invention provides a screw extruder die assembly, which has the following beneficial effects compared with the prior art:

[0019] The screw extruder die assembly of the embodiment of the present invention is provided with a blowing pipe on the upper and lower sides of the die discharge hole. The blowing pipe has a blowing hole facing the discharge hole. The screw extruder is applied. In actual application, a high-pressure airflow is input into the blowing pipe, and the high-pressure airflow is output from the blowing hole and blown toward the discharge hole, thereby removing the precipitate at the edge of the discharge hole. Compared with manual removal of precipitates, the screw extruder does not need to be shut down and re-stretched, which can avoid material waste and reduce labor intensity. In addition, the upper and lower sides of the discharge hole are provided with blowing pipes, and the upper edge and the lower edge of the discharge hole can be blown by the airflow, which can improve the effect of removing the precipitate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of the cooperation of the die, the blowing assembly and the air inlet assembly in the embodiment of the utility model;

[0021] Figure 2 This is a structural diagram of the cooperation between the blowing assembly and the air intake assembly in an embodiment of the present utility model;

[0022] Figure 3 It is a structural diagram of the air blowing pipe according to an embodiment of the present utility model.

[0023] In the figure, 1. die; 2. blowing assembly; 21. blowing pipe; 22. first mounting seat; 23. second mounting seat; 24. fixing ring; 25. tightening adjustment member; 3. air intake assembly; 31. air intake pipe; 32. air source; 33. air pressure control member; 100. discharge hole; 200. blowing hole; 300. connecting hole. DETAILED DESCRIPTION

[0024] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] like Figures 1 to 3 As shown, a screw extruder die assembly of an embodiment of the present invention includes a die 1 and a blowing assembly 2; the die 1 has a plurality of discharge holes 100 arranged at intervals laterally; the blowing assembly 2 includes a blowing pipe 21, and the blowing pipe 21 has blowing holes 200; wherein, the upper and lower sides of the discharge hole 100 are provided with blowing pipes 21, the blowing holes 200 face the discharge hole 100, and the blowing holes 200 are spaced apart from the discharge hole 100, and the blowing holes 200 are used to blow air toward the discharge hole 100 to remove the precipitates on the edge of the discharge hole 100.

[0026] Since the upper and lower sides of the discharge hole 100 are provided with a blowing pipe 21, and the blowing pipe 21 has a blowing hole 200 facing the discharge hole 100, therefore, in actual application, a high-pressure airflow is input into the blowing pipe 21, and the high-pressure airflow will be output from the blowing hole 200 and blown toward the discharge port, thereby removing the precipitate at the edge of the discharge hole 100. Compared with manual removal of precipitates, the screw extruder does not need to be shut down and re-pulled, which can avoid material waste and reduce labor intensity. In addition, the upper and lower sides of the discharge hole 100 are provided with a blowing pipe 21, and the upper and lower edges of the discharge hole 100 can be blown by the airflow, which can improve the effect of removing the precipitate.

[0027] As one specific implementation of the present application, the blowing holes 200 are circular holes with a diameter ranging from 2.5 to 3 mm. The spacing between the blowing holes 200 and the discharge hole 100 is consistent, and the vertical distance between the upper and lower blowing holes 200 and the discharge hole 100 is maintained within a range of 3 to 4 cm.

[0028] In this embodiment, the blowing assembly 2 also includes a first mounting seat 22 and a second mounting seat 23, and the first mounting seat 22 and the second mounting seat 23 are both mounted on the die 1, and the first mounting seat 22 and the second mounting seat 23 are arranged laterally at intervals on the surface where the discharge end of the discharge hole 100 is located; all discharge holes 100 are located between the first mounting seat 22 and the second mounting seat 23; the blowing pipe 21 is respectively mounted on the first mounting seat 22 and the second mounting seat 23 at both ends along its length direction. This structure for installing the blowing pipe 21 has a simple structure, and both ends of the blowing pipe 21 along its length direction are fixed. The blowing pipe 21 can be stably set, and the blowing pipe 21 will not shake during blowing; in addition, when assembling the blowing pipe 21, the blowing pipe 21 can be assembled to a position closer to the discharge hole 100, so that the airflow output by the blowing pipe 21 can exert a greater force on the precipitate, effectively improving the cleaning effect.

[0029] Furthermore, the first mounting seat 22 and the second mounting seat 23 both have a fixing ring 24, and the first mounting seat 22 and the second mounting seat 23 both fix the blowing pipe 21 through the fixing ring 24. In actual application, the blowing pipe 21 is installed by passing through the ring hole of the fixing ring 24, which is easy to assemble.

[0030] The outer peripheral wall of the fixing ring 24 is provided with a connecting hole 300, and the connecting hole 300 is connected to the annular hole of the fixing ring 24; the blowing assembly 2 also includes a fastening adjustment piece 25, the fastening adjustment piece 25 passes through the connecting hole 300 and is connected to the hole wall of the connecting hole 300, and one end of the fastening adjustment piece 25 located in the annular hole of the fixing ring 24 is tightly pressed against the outer peripheral wall of the blowing pipe 21; that is, the annular hole of the blowing pipe 21 and the fixing ring 24 are clearance-matched, and the blowing pipe 21 is easy to pass through the annular hole of the fixing ring 24, which is easy to operate. In addition, the fastening adjustment piece 25 can make the blowing pipe 21 rotate or fix relative to the first mounting seat 22 and the second mounting seat 23. When the blowing hole 200 needs to be cleaned, the blowing hole 200 can be cleaned by adjusting the fastening adjustment piece 25. The air pipe 21 can be rotated relative to the first mounting seat 22 and the second mounting seat 23, so that the staff can rotate the blowing hole 200 of the blowing pipe 21 to a position that is easy to clean manually, so that the staff can clean the blowing hole 200. After cleaning the blowing hole 200, the staff will turn the blowing pipe 21 back to the working position (the position where the blowing hole 200 faces the discharge hole 100) and adjust the fastening adjustment member 25 to fix the blowing pipe 21. The blowing pipe 21 is installed by the fixing ring 24 and the fastening adjustment member 25. It has a simple structure, is easy to install and is easy to clean the blowing hole 200; as one of the implementation methods of the present application, the connecting hole 300 is a threaded hole and the fastening adjustment member 25 is a screw.

[0031] In actual application, the installation includes two ways: detachable and non-detachable. Optionally, the first mounting seat 22 and the second mounting seat 23 are detachably mounted on the die 1. Thus, the blowing assembly 2 can be applied to other screw extruders, and the application adaptability of the blowing assembly 2 is relatively high.

[0032] In the present application, the screw extruder die assembly also includes an air intake assembly 3, which includes an air intake pipe 31 and an air source 32. The air intake pipe 31 connects the blowing pipe 21 and the air source 32, and high-pressure gas is transported to the blowing pipe 21 through the air source 32 and the air intake pipe 31, thereby realizing the purging function of the blowing pipe 21; specifically, the air intake pipe 31 includes a main pipe and two branch pipes, one branch pipe connects one blowing pipe 21 and the main pipe, and the main pipe is connected to the air source 32, that is, the air source 32 supplies air to the two blowing pipes 21 at the same time through the air intake pipe 31, with a simple structure and easy operation.

[0033] The air intake assembly 3 also includes an air pressure control component 33, which is connected to the air intake pipe 31. The air pressure control component 33 can be used to adjust the air pressure of the air flow according to the actual required blowing force to better remove the precipitates and further improve the removal effect of the precipitates. Optionally, the air pressure control component 33 is connected to the connection between the main pipe and the two branch pipes, and this application does not impose any restrictions on this. As one of the specific implementations of this application, the air pressure control component 33 is a mechanical air pressure valve, which adjusts the air pressure through manual rotation, and has a simple structure and low cost.

[0034] In this embodiment, the gas source 32 is a nitrogen generating device, such as a nitrogen generator. The advantage is that the airflow output by the nitrogen generator is a nitrogen flow, which can effectively reduce the oxygen concentration at the discharge hole 100, reduce the oxidation rate of the precipitates, and effectively avoid the accumulation of oxidation to form carbides, so as to better remove the precipitates, further improve the removal effect, ensure product quality, and reduce labor intensity.

[0035] In other embodiments, the gas source 32 is an air compressor that outputs high-pressure gas, which can also remove precipitates.

[0036] In other embodiments, the gas source 32 may also be a nitrogen storage device, such as a nitrogen tank, a nitrogen bottle, or a nitrogen storage device commonly used in the art.

[0037] In actual application, the die 1 has a certain temperature during operation to ensure the normal progress of the extrusion work. In the present application, preferably, the gas output by the gas source 32 is heated and then transported to the blowing pipe 21. Thus, the gas output from the blowing hole 200 has a certain temperature, which can avoid lowering the temperature of the die 1 and ensure the normal progress of the extrusion work.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A screw extruder die assembly, characterized in that, It comprises a die (1) and a blowing assembly (2); The die (1) has a plurality of discharge holes (100) arranged at intervals in the transverse direction; The blowing assembly (2) comprises a blowing pipe (21), and the blowing pipe (21) has a blowing hole (200); The blowing pipe (21) is provided on both the upper and lower sides of the discharge hole (100), the blowing hole (200) faces the discharge hole (100), and the blowing hole (200) is spaced apart from the discharge hole (100), and the blowing hole (200) is used to blow air toward the discharge hole (100) to remove precipitates on the edge of the discharge hole (100).

2. The screw extruder die assembly according to claim 1, characterized in that The blowing assembly (2) further comprises a first mounting seat (22) and a second mounting seat (23), wherein the first mounting seat (22) and the second mounting seat (23) are both mounted on the die (1), and the first mounting seat (22) and the second mounting seat (23) are arranged laterally and spaced apart on the surface where the discharge end of the discharge hole (100) is located; All the discharge holes (100) are located between the first mounting seat (22) and the second mounting seat (23); The two ends of the air blowing pipe (21) along its length direction are respectively mounted on the first mounting seat (22) and the second mounting seat (23).

3. The screw extruder die assembly according to claim 2, characterized in that The first mounting seat (22) and the second mounting seat (23) both have a fixing ring (24), and the first mounting seat (22) and the second mounting seat (23) both fix the air blowing pipe (21) via the fixing ring (24).

4. The screw extruder die assembly according to claim 3, characterized in that The outer peripheral wall of the fixing ring (24) is provided with a connecting hole (300), and the connecting hole (300) is connected to the annular hole of the fixing ring (24); The blowing assembly (2) further comprises a fastening adjustment member (25), the fastening adjustment member (25) passing through the connecting hole (300) and connected to the hole wall of the connecting hole (300), and one end of the fastening adjustment member (25) located in the ring hole of the fixing ring (24) is tightly pressed against the outer peripheral wall of the blowing pipe (21).

5. The screw extruder die assembly according to claim 2, characterized in that: The first mounting seat (22) and the second mounting seat (23) are detachably mounted on the die (1).

6. The screw extruder die assembly according to claim 1, characterized in that It also includes an air intake assembly (3), the air intake assembly (3) including an air intake pipe (31) and an air source (32), the air intake pipe (31) connecting the air blowing pipe (21) and the air source (32).

7. The screw extruder die assembly according to claim 6, characterized in that: The air intake assembly (3) further includes an air pressure control component (33), and the air pressure control component (33) is connected to the air intake pipe (31).

8. The screw extruder die assembly according to claim 6, characterized in that: The gas source (32) is one of nitrogen production equipment, nitrogen storage equipment, and an air compressor.

Images