Measuring head device of screw extruder

Abstract

The measuring head device comprises a measuring head seat and a measuring head core, the measuring head seat is provided with an assembling hole extending in the axial direction, a discharging channel communicated with the assembling hole and extending in the radial direction and a discharging opening communicated with the discharging channel, the measuring head core is installed in the assembling hole, and the measuring head core is installed in the discharging opening. The measuring head core is provided with a filter cylinder part connected with the discharging end of the machine cylinder, the rear end of the filter cylinder part is provided with a feeding port, and a plurality of filter holes communicated with the feeding port and the discharging channel are formed in the position, opposite to the discharging channel, of the filter cylinder part. The measuring head device is used in the chemical fiber spinning equipment, the measuring head device can filter melt, material discharging of the chemical fiber spinning equipment is stable, and the spinning quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of material extrusion molding, and particularly relates to a measuring head device for a screw extruder. Background Art

[0002] In the production process of plastic spinning, a screw extruder is required to melt and extrude high-molecular raw materials. The screw extruder can heat, melt, and mix the high-molecular raw materials in the barrel body, and finally extrude them through a spinneret. Currently, common domestic plastic screw extruders generally heat and melt the materials and discharge them to the measuring head of the screw extruder. The function of the measuring head is to measure and control the outlet pressure of the screw extruder to ensure the uniform and stable quality of the melt. Since in the actual production process, the materials may sometimes be doped with impurities, which makes the performance of the materials unstable and is not conducive to the reuse of the materials; since the temperature fluctuates greatly during the extrusion process of the materials, the materials are prone to agglomerate with each other, making it difficult to discharge the materials and affecting the subsequent production and processing. Summary of the Invention

[0003] The purpose of the present application is to solve the problem that the impurities in the existing technology affect the spinning quality. The present application provides a measuring head device with a filtering function.

[0004] To achieve the above purpose, the present application adopts the following technical solutions:

[0005] The present application provides a measuring head device for a screw extruder, including a measuring head seat and a measuring head core. The measuring head seat is provided with an assembly hole extending axially, a discharge channel communicating with the assembly hole and extending radially, and a discharge port communicating with the discharge channel. The measuring head core is installed in the assembly hole. The measuring head core has a filter cylinder part connected to the discharge end of the barrel. The rear end of the filter cylinder part has a feed inlet, and a plurality of filter holes communicating the feed inlet and the discharge channel are provided at a position of the filter cylinder part opposite to the discharge channel.

[0006] In a possible implementation manner, the filter cylinder part of the measuring head core is further provided with a groove extending circumferentially, and the discharge channel is opposite to the groove.

[0007] In a possible implementation manner, in the circumferential direction of the filter cylinder part, the groove depth at the position opposite to the discharge channel is smaller than the groove depth on the side away from the discharge channel.

[0008] In a possible implementation manner, the plurality of filter holes are uniformly distributed at the bottom of the groove.

[0009] In a possible implementation manner, the sizes of the respective filter holes are the same, and the filter holes are cylindrical through holes.

[0010] In a possible implementation, the measuring head core has an end cap with a diameter larger than that of the filter cartridge portion, and the assembly hole formed in the measuring head seat includes a first hole section in clearance fit with the end cap and a second hole section in interference fit with the filter cartridge portion.

[0011] In a possible implementation, a sealed connection is provided between the first hole section of the measuring head seat and the end cap of the measuring head core.

[0012] In a possible implementation, a flange surrounding the second hole section is provided on the rear end face of the measuring head seat.

[0013] In a possible implementation, a ring groove is formed in the measuring head seat in the circumferential direction, and a sleeve is further provided in sealed sleeved connection on the outside of the measuring head seat. A gas cavity into which high-temperature steam can pass is formed between the sleeve and the ring groove of the measuring head seat. The measuring head device further includes a steam pipe communicated with the gas cavity.

[0014] In a possible implementation, a discharge pipe is inserted into the discharge channel, and an outer pipe is further sleeved on the outside of the discharge pipe. The end of the outer pipe is hermetically connected with an interface flange, and the pipe cavity between the outer pipe and the discharge pipe is communicated with the gas cavity. Description of the Drawings

[0015] Figure 1 is the main sectional schematic view of the measuring head device given in an embodiment of the present application;

[0016] Figure 2 is the internal structure schematic view of the measuring head device given in an embodiment of the present application;

[0017] Figure 3 is the sectional schematic view of the measuring head given in an embodiment of the present application;

[0018] Figure 4 is the sectional schematic view of the measuring head seat given in an embodiment of the present application;

[0019] Figure 5 is the sectional schematic view of the measuring head core given in an embodiment of the present application;

[0020] Figure 6 is the developed schematic view of the groove in an embodiment of the present application.

[0021] Among them, 1. Measuring head seat; 2. Measuring head core; 3. Sleeve; 30. Air cavity; 4. Outer shell; 5. Steam pipe; 6. Thermocouple; 7. Interface flange; 8. Discharge pipe; 9. Outer pipe; 11. Assembly hole; 12. Discharge port; 121. Discharge channel; 122. First transition cavity; 13. Flange; 20. Feed inlet; 21. Second transition cavity; 22. Through hole; 23. Filter cartridge part; 24. Fastener; 25. First mounting hole; 26. Second mounting hole; 27. End cap. Detailed implementation mode

[0022] To describe in detail the technical content, structural features, achieved objectives and effects of the invention, the following will describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementation manners of the invention. However, various exemplary embodiments can also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments can be different, but do not have to be exclusive. For example, without departing from the inventive concept, the specific shapes, structures and characteristics of the exemplary embodiments can be used or implemented in another exemplary embodiment.

[0023] Hereinafter, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0024] In addition, in the present application, spatial relative terms such as "under", "below", "beneath", "under", "above", "on", "over", "higher", "side" (for example, as in "side wall"), etc. are used to describe the relationship between one element and another (other) element as shown in the accompanying drawings. The spatial relative terms are intended to include different orientations of the device in use, operation and / or manufacture in addition to the orientation depicted in the drawings. For example, if the device in the drawing is flipped, the element described as "under" or "beneath" other elements or features will subsequently be positioned "above" the other elements or features. Therefore, the exemplary term "under" can include both the upper and lower orientations. In addition, the device can be positioned otherwise (for example, rotated 90 degrees or in other orientations), and thus, the corresponding spatial relative descriptive terms used herein are interpreted accordingly.

[0025] See Figure 1 、2 As shown in 2 , a measuring head device of a screw extruder is installed at the front of the discharge flange of the barrel of the screw extruder. The measuring head device specifically includes: a housing 4, a measuring head seat 1 disposed within the housing 4, and a measuring head core 2.

[0026] See Figure 1-3 , a sleeve 3 is sleeved outside the measuring head seat 1. The measuring head seat 1 is provided with an annular groove along the circumferential direction. The sleeve 3 and the annular groove of the measuring head seat 1 enclose a gas cavity 30 into which high-temperature steam can be introduced. The measuring head device further includes a steam pipe 5 communicating with the gas cavity 30. Biphenyl steam is introduced into the steam pipe 5 to heat the measuring head seat. Since the temperature in the gas cavity 30 is very high, in order to avoid scalding, heat-insulating cotton material is filled between the housing and the measuring head seat.

[0027] See Figure 2 , 3 , 4, the measuring head seat 1 is provided with an assembly hole 11 extending axially forward and backward, a discharge channel 121 communicating with the assembly hole 11 and extending radially, and a discharge port 12 communicating with the discharge channel. Among them, the axial direction refers to the axial direction of the screw of the screw extruder. The "rear side" in the specification refers to the right side in Figure 3 , and the "front side" in the specification refers to the left side in Figure 3 . The assembly hole 11 includes a first hole section and a second hole section with an inner diameter smaller than that of the first hole section. The rear end face of the measuring head seat 1 has a flange 13 surrounding the second hole section for one week. The discharge channel 121 is perpendicular to the second hole section of the assembly hole 11. Figure 3 the right side in Figure 3 the left side in

[0028] See Figure 2 , 3 , 5, the measuring head core 2 is installed in the assembly hole 11. The measuring head core 2 has a filter cartridge part 23 opposite to the discharge end of the barrel and an end cap 21 with a diameter larger than that of the filter cartridge part 23. Among them, the filter cartridge part 23 has a cylindrical thin-wall structure, and the outer diameter of the end cap 21 is larger than that of the filter cartridge part 23. When the measuring head core 2 is installed in the assembly hole, the end cap 21 is located in the first hole section of the assembly hole 11 and is fixedly connected to the measuring head seat 1 through a fastener. A sealing structure is also provided between the end cap 21 of the measuring head core 2 and the first hole section of the measuring head seat 1 to achieve gas tightness. The filter cartridge part 23 is in interference fit with the second hole section of the assembly hole 11.

[0029] The rear end of the filter cartridge part 23 has a feed inlet 20. The filter cartridge part 23 is provided with grooves along the circumferential direction. A plurality of filter holes 22 are evenly distributed at the bottom of the groove. The sizes of the filter holes 22 are the same, and the shape is a cylindrical through hole. See Figure 6 as shown in

[0030] The discharge channel 121 faces the groove. The width of the groove is greater than or equal to the inner diameter of the discharge channel 121, and a plurality of filter holes 22 communicate the inner cavity of the filter cartridge portion 23 with the discharge channel 121. A discharge pipe 8 is inserted inside the discharge channel 121. In order to ensure that the temperature of the material in the discharge pipe does not decrease, an outer pipe 9 is sleeved outside the discharge pipe 8. The end of the outer pipe 9 is hermetically connected to an interface flange 7, and the pipe cavity between the outer pipe 9 and the discharge pipe 8 communicates with the air cavity 30.

[0031] In one embodiment, in the circumferential direction of the filter cartridge portion 23, the depth of the groove at the position opposite to the discharge channel 121 is smaller than the depth of the groove on the side away from the discharge channel 121. As Figure 2 、 3 、5, it can be seen that the groove forms a first transition cavity 122 on the side of the filter cartridge portion opposite to the discharge channel 121, and a second transition cavity 21 on the side away from the discharge channel 121. The depth of the first transition cavity 122 is shallow, and the depth of the second transition cavity 21 is greater, so that the filtering portion can perform filtering in the entire circumferential direction.

[0032] When the screw extruder works, the material enters the filter cartridge portion 23 through the feed inlet 20, then passes through a plurality of filter holes 22 for filtering, enters the discharge channel 121, and finally is discharged from the discharge pipe 8. Large-volume impurities in the material can be blocked and will not enter the discharge end. And by entering the discharge channel 121 through the filter holes 22, the materials will not stick to each other. And due to the existence of the filter holes 22, the material pressure increases, so that the discharge speed is accelerated.

[0033] See Figure 5 The measuring head core 2 is also provided with a first mounting hole 24 communicating with the feed inlet 20 and a plurality of second mounting holes 26 for mounting thermocouples. A pressure sensor is installed in the first mounting hole 24 to measure the melt pressure in the filtering portion.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements. The scope of protection required by the present invention is defined by the appended claims, the specification and their equivalents.

Claims

1. A measuring head device for a screw extruder, characterized in that: It includes a measuring head base (1) and a measuring head core (2). The measuring head base (1) is provided with an assembly hole (11) extending axially, a discharge channel (121) communicating with the assembly hole (11) and extending radially, and a discharge port (12) communicating with the discharge channel. The measuring head core (2) is installed in the assembly hole (11). The measuring head core (2) has a filter cartridge part (23) connected to the discharge end of the barrel. The rear end of the filter cartridge part (23) has a feed inlet (20), and a plurality of filter holes (22) communicating the feed inlet (20) and the discharge channel (121) are provided at the position of the filter cartridge part (23) opposite to the discharge channel (121).

2. The measuring head device of the screw extruder according to claim 1, characterized in that, The filter cartridge part (23) of the measuring head core (2) is also provided with a groove extending circumferentially, and the discharge channel (121) is opposite to the groove.

3. The measuring head device of the screw extruder according to claim 2, characterized in that, In the circumferential direction of the filter cartridge part (23), the groove depth of the groove opposite to the discharge channel (121) is smaller than the groove depth of the groove on the side away from the discharge channel (121).

4. The measuring head device of the screw extruder according to claim 2, characterized in that, The plurality of filter holes (22) are uniformly distributed at the bottom of the groove (122).

5. The measuring head device of the screw extruder according to claim 1, characterized in that, The sizes of the filter holes (22) are the same, and the filter holes (22) are cylindrical through holes.

6. The measuring head device of the screw extruder according to claim 1, characterized in that, The measuring head core (2) has an end cap (21) with a diameter larger than that of the filter cartridge part (23). The assembly hole (11) provided on the measuring head base (1) includes a first hole section with a clearance fit with the end cap (21) and a second hole section with an interference fit with the filter cartridge part (23).

7. The measuring head device of the screw extruder according to claim 6, characterized in that, A sealed connection is provided between the first hole section of the measuring head base (1) and the end cap (21) of the measuring head core (2).

8. The measuring head device of the screw extruder according to claim 6, characterized in that, A flange (13) surrounding the second hole section is provided on the rear end face of the measuring head base (1).

9. The measuring head device of the screw extruder according to claim 1, characterized in that, The measuring head base (1) is provided with a circumferential annular groove. A sleeve (3) is also hermetically sleeved outside the measuring head base (1). An air cavity (30) into which high-temperature steam can be introduced is formed between the sleeve (3) and the annular groove of the measuring head base (1). The measuring head device also includes a steam pipe (5) communicating with the air cavity (30).

10. The measuring head device of the screw extruder according to claim 9, characterized in that, A discharge pipe (8) is inserted inside the discharge channel (121). An outer pipe (9) is also sleeved outside the discharge pipe (8). An interface flange (7) is hermetically connected to the end of the outer pipe (9). The pipe cavity between the outer pipe (9) and the discharge pipe (8) communicates with the air cavity (30).

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