Filter for wire drawing machine and wire drawing machine

Abstract

The invention discloses a filter for a wire drawing machine, belongs to the field of plastic processing machinery, solves the problem of low working efficiency caused by high replacement frequency of filter screens, and adopts the technical scheme that at least two screen replacement cavities are arranged, all the screen replacement cavities are communicated through a melt feeding runner, and filter screen cylinders are inserted into the screen replacement cavities one by one; a circulation gap is formed between the periphery of the filter screen cylinder and the inner wall of the screen changing cavity, the box body is provided with an installing hole communicated with one end of the screen changing cavity, the installing hole is used for installing the filter screen cylinder, the other end of the screen changing cavity is provided with a connecting through hole communicated with the melt discharging runner, one end of the filter screen cylinder is fixed to the box body, and the other end of the filter screen cylinder is open and is in butt joint with the connecting through hole. The filter is mainly used for prolonging the service life of the filter, reducing the replacement frequency of the filter screen, ensuring the working efficiency of the wire drawing machine and improving the use experience of a user. The invention further discloses the wire drawing machine which adopts the filter for the wire drawing machine.

Description

Technical Field

[0001] The present invention relates to the field of plastic processing machinery, in particular to a filter for a wire drawing machine and a wire drawing machine. Background Art

[0002] In the plastic weaving industry, in order to reduce production costs, recycled plastics are generally used to make recycled materials, which contain more impurities. Therefore, they need to be filtered before being transported to the die head for molding. In existing wire drawing machines, a disc-shaped filter is used to filter the molten plastic extruded by the extruder for the first time. For example, the plastic filter disclosed in the prior art CN210940386U. In order to ensure the filtering efficiency, the diameter of this filter is more than one meter, the volume is large, and the weight will reach about one ton. Each time the filter screen is replaced, a crane is needed for hoisting, which is very inconvenient, and it is easy to have a falling accident, there is a certain safety risk. At the same time, because the area of the filter screen is limited, it will become blocked after filtering for a short period of time, and the filter screen needs to be replaced in time, resulting in a high replacement frequency of the filter screen. Since the machine needs to be shut down when replacing the filter screen, the working efficiency of the wire drawing machine is affected, causing a bad user experience. Summary of the Invention

[0003] The purpose to be achieved by the present invention is to provide a filter for a wire drawing machine, solve the problem of low working efficiency caused by the high replacement frequency of the filter screen, extend the service time of the filter, reduce the replacement frequency of the filter screen, ensure the working efficiency of the wire drawing machine, and improve the user experience.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A filter for a wire drawing machine includes a box body and a filter screen cylinder. The box body is provided with a melt inlet flow channel, a melt outlet flow channel and a screen changing cavity. The inlet of the melt inlet flow channel is connected to the discharge screw of the extruder. There are at least two screen changing cavities. The melt inlet flow channel connects all the screen changing cavities. The filter screen cylinders are inserted into the screen changing cavities one by one. There is a flow gap between the outer periphery of the filter screen cylinder and the inner wall of the screen changing cavity. The box body is provided with an installation hole connected to one end of the screen changing cavity, and the installation hole is for installing the filter screen cylinder. The other end of the screen changing cavity is provided with a connection through hole connected to the melt outlet flow channel. One end of the filter screen cylinder is fixed to the box body, and the other end is open and abuts against the connection through hole. The melt flows through the melt inlet flow channel, the screen changing cavity, the filter screen cylinder, the connection through hole and the melt outlet flow channel in sequence.

[0005] After adopting the above technical solution, the present invention has the following advantages: multiple screen-changing cavities are provided. Since the melt feeding channel communicates all the screen-changing cavities, multiple filter screen cylinders can filter simultaneously, multiplying the filtering area. Debris is not likely to block all the filter screen cylinders, which can extend the service life of the filter, reduce the replacement frequency of the filter screen cylinders, decrease the number of shutdowns of the wire drawing machine, ensure the working efficiency of the wire drawing machine. Moreover, the weight of a single filter screen cylinder is small, generally only about twenty catties, and can be easily operated by one worker, with convenient replacement, reducing the labor intensity of workers for replacing the filter screen and being less likely to cause safety accidents. The filter screen cylinder occupies a small volume, and the number of filter screen cylinders can be increased as needed to improve the filtering efficiency.

[0006] Further, the filter screen cylinder includes a cylinder body support and a filter screen. The filter screen is sleeved on the outer periphery of the cylinder body support. The outer end of the cylinder body support is fixedly connected to the box body. The inner end of the cylinder body support is positioned at the other end of the screen-changing cavity and is located on the outer periphery of the connection through hole. The inner hole of the cylinder body support communicates with the connection through hole.

[0007] Adopting the foregoing technical solution, the filter screen is sleeved on the outer periphery of the cylinder body support, which is convenient for the cylinder body support to be cleaned and reused. At the same time, the cylinder body support is used to support the filter screen, avoiding the deformation of the filter screen under the action of the melt pressure and affecting the filtering effect. The structural strength of the cylinder body support can also improve the stability of the filter screen cylinder after installation, ensuring that the melt can be fully filtered and there will be no situation of unfiltered leakage of materials.

[0008] Further, a connection flange is provided at the outer end of the cylinder body support. The connection flange is fixedly connected to the box body to fix the filter screen cylinder and seal the installation hole.

[0009] Adopting the foregoing technical solution, the connection flange is convenient for installation and fixation and ensures reliable strength after installation. It can also increase the contact and cooperation area with the box body, improve the sealing performance, and avoid the overflow of the melt from the installation hole.

[0010] Further, the cylinder body support and the connection flange are integrally formed or welded and fixed; and / or, a mating stop is provided on the side of the connection flange facing the box body, and the mating stop is inserted into the installation hole for cooperation.

[0011] Adopting the foregoing technical solution, it ensures the connection reliability between the cylinder body support and the connection flange, which is beneficial for long-term repeated use; by means of the mating stop, the positioning accuracy during the installation of the connection flange is increased, which is convenient for the installation of bolts, and at the same time, it can support and position the outer end of the cylinder body support.

[0012] Further, a positioning groove is provided at the other end of the screen-changing cavity. The inner end of the cylinder body support is inserted into the positioning groove for cooperation. The connection through hole is provided at the bottom surface of the positioning groove, and the opening at the other end of the filter screen cylinder covers the connection through hole.

[0013] Adopting the foregoing technical solution, the positioning reliability of the cylinder support is further improved, and it is further ensured that the melt can flow into the cylinder support only after being filtered by the filter screen.

[0014] Furthermore, the box body includes a base body and a discharge plate. The melt feed channel and the screen-changing cavity are arranged in the base body, the connecting through hole and the melt discharge channel are arranged in the discharge plate, the screen-changing cavity is arranged horizontally, and the discharge plate is detachably fixed to one side of the base body.

[0015] Adopting the foregoing technical solution, the discharge plate is detachable relative to the base body, which is convenient for maintenance. The screen-changing cavity is arranged horizontally, which is conducive to the melt flowing into the screen-changing cavity and then dispersing to the outer peripheral side of the filter screen, enabling the filter screen to be evenly stressed, improving the utilization rate of the filter screen, and facilitating ensuring the filtering efficiency.

[0016] Furthermore, a heater for keeping the melt in the melt feed channel in a molten state and a temperature sensor for monitoring the heating temperature are arranged on the base body.

[0017] Adopting the foregoing technical solution, the heater can ensure that the melt remains in a molten state, has sufficient fluidity, and keeps the melt pressure in the melt feed channel at an appropriate level. The temperature sensor can assist in adjusting the working temperature of the heater to avoid the heater temperature being too low or too high.

[0018] Furthermore, the axes of all the screen-changing cavities are arranged in parallel, and the melt feed channel is connected to the middle of the screen-changing cavity.

[0019] Adopting the foregoing technical solution, the disassembly directions of all the filter cartridges are the same, which is convenient for workers to replace. The melt feed channel is connected to the middle of the screen-changing cavity, enabling the melt to quickly disperse to the outer periphery of the entire filter cartridge after entering the screen-changing cavity by using the melt pressure, reducing the influence of gravity on the melt flow, and using the extrusion speed of the extruder to adjust the melt pressure, improving the controllability, facilitating promoting the melt filtration, and improving the filtration efficiency.

[0020] The present invention also provides a wire drawing machine, which includes an extruder and a filter. The filter adopts the wire drawing machine filter described in any of the above technical solutions, and the inlet of the melt feed channel is communicated with the discharge screw of the extruder.

[0021] Adopting the foregoing technical solution, multiple filter cartridges can filter simultaneously, doubling the filtration area. Debris is not likely to block all the filter cartridges, which can extend the service life of the filter, reduce the replacement frequency of the filter cartridges, reduce the number of shutdowns of the wire drawing machine, and ensure the working efficiency of the wire drawing machine.

[0022] Furthermore, a belt type screen changer is connected to the downstream of the melt discharge channel, and a die head is connected to the downstream of the belt type screen changer.

[0023] With the foregoing technical solution, after rough filtration using the filter mesh cylinder and then fine filtration using the belt type screen changer, the filtration quality can be improved. At the same time, after the filter mesh cylinder filters out large particle impurities, the service life of the belt type screen changer can be extended and the screen changing frequency of the belt type screen changer can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 Schematic diagram of a filter for a wire drawing machine according to the present invention;

[0026] Figure 2 is Figure 1 Schematic diagram of the cross-section at A-A in

[0027] Figure 3 Cross-sectional view (I) of a filter for a wire drawing machine according to the present invention;

[0028] Figure 4 is Figure 3 Schematic diagram of the cross-section at B-B in

[0029] Figure 5 is Figure 3 Schematic diagram of the cross-section at C-C in

[0030] Figure 6 Cross-sectional view (II) of a filter for a wire drawing machine according to the present invention;

[0031] Figure 7 Partial schematic diagram of a wire drawing machine according to the present invention (upstream part of the die head)

[0032] Figure 8 is Figure 7 front view of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention.

[0034] The terms "first", "second", etc. (if any) in the description and claims of the present invention are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used in front of a technical feature to make a distinction, it does not necessarily imply the existence of "first". It should be understood that in the present invention, "comprising" and "having" and any of their variations are intended to cover non-exclusive inclusion. It should be understood that in the present invention, "a plurality of" means two or more. "And / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist simultaneously, and Y exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "Comprising X, Y, and Z", "comprising X, Y, Z" means that X, Y, and Z are all included, "comprising X, Y, or Z" means that one of X, Y, and Z is included, and "comprising X, Y, and / or Z" means that any one or any two or all three of X, Y, and Z are included.

[0035] The technical solution of the present invention will be described in detail below with specific embodiments. These specific embodiments can be combined or replaced according to actual situations, and the same or similar concepts or processes may not be repeated in some embodiments.

[0036] Embodiment 1:

[0037] As Figures 1 to 5 shown, the present invention provides a filter for a wire drawing machine, which includes a box body 100 and a filter mesh cylinder 200. The box body 100 is provided with a melt inlet flow channel 101, a melt outlet flow channel 102, and a screen changing cavity 103. The inlet of the melt inlet flow channel 101 is communicated with the discharge screw of the extruder. There are four screen changing cavities 103. The melt inlet flow channel 101 communicates all the screen changing cavities 103. The filter mesh cylinder 200 is inserted into the screen changing cavity 103 one by one. There is a flow gap 104 between the outer periphery of the filter mesh cylinder 200 and the inner wall of the screen changing cavity 103. The box body 100 is provided with an installation hole 105 communicated with one end of the screen changing cavity 103. The installation hole 105 is for installing the filter mesh cylinder 200. The other end of the screen changing cavity 103 is provided with a connection through hole 106 communicated with the melt outlet flow channel 102. One end of the filter mesh cylinder 200 is fixed to the box body 100, and the other end is open and abuts against the connection through hole 106. The melt flows through the melt inlet flow channel 101, the screen changing cavity 103, the filter mesh cylinder 200, the connection through hole 106, and the melt outlet flow channel 102 in sequence, as shown by the arrows in Figure 2 . The number of screen changing cavities 103 can be adjusted according to actual needs, and can be designed to be 2 - 8. In some large wire drawing machines, the number of screen changing cavities 103 can be increased.

[0038] The present invention provides a plurality of screen-changing cavities 103. Since the melt feed channel 101 connects all the screen-changing cavities 103, a plurality of filter mesh cylinders 200 can be filtered simultaneously, doubling the filtering area. Debris is not easily blocked in all the filter mesh cylinders 200, which can extend the service life of the filter, reduce the replacement frequency of the filter mesh cylinders 200, decrease the shutdown times of the wire drawing machine, ensure the working efficiency of the wire drawing machine. Moreover, the weight of a single filter mesh cylinder 200 is small, generally only about twenty catties, and can be easily operated by a single worker, with convenient replacement, reducing the labor intensity of workers for replacing the filter mesh and not likely to cause safety accidents. The filter mesh cylinder 200 occupies a small volume, and the number of filter mesh cylinders 200 can be increased as needed to improve the filtering efficiency.

[0039] In one embodiment, the filter mesh cylinder 200 includes a cylinder support 21 and a filter mesh 22. The filter mesh 22 is sleeved on the outer periphery of the cylinder support 21. The outer end of the cylinder support 21 is fixedly connected to the box body 100. The inner end of the cylinder support 21 is positioned at the other end of the screen-changing cavity 103 and is located on the outer periphery of the connection through hole 106. The inner hole 210 of the cylinder support 21 is communicated with the connection through hole 106. The filter mesh 22 is sleeved on the outer periphery of the cylinder support 21, which is convenient for the cylinder support 21 to be reused after cleaning. At the same time, the cylinder support 21 is used to support the filter mesh 22 to prevent the filter mesh 22 from deforming under the action of the melt pressure and affecting the filtering effect. The structural strength of the cylinder support 21 can also improve the stability of the filter mesh cylinder 200 after installation, ensuring that the melt can be fully filtered and there will be no situation of unfiltered leakage. To ensure the filtering efficiency, not less than 300 small holes 213 can be provided on the cylinder support 21, and the small holes 213 are communicated with the inner hole 210 of the cylinder support 21. To ensure the filtering efficiency, the outer circumferential area of a single filter mesh 22 is not less than 0.5 ㎡. The filter mesh 22 can be sleeved only one layer on the outer periphery of the cylinder support 21, or multiple layers can be sleeved as needed to improve the filtering effect.

[0040] In one embodiment, a connection flange 211 is provided at the outer end of the cylinder support 21. The connection flange 211 is fixedly connected to the box body 100 to fix the filter mesh cylinder 200 and seal the installation hole 105. The connection flange 211 is convenient for installation and fixation and ensures reliable strength after installation. It can also increase the contact and cooperation area with the box body 100 to improve the sealing performance and prevent the melt from overflowing from the installation hole 105. The connection flange 211 can be fixedly connected to the box body 100 through bolts 212.

[0041] The cylinder support 21 and the connecting flange 211 are integrally formed, or welding fixation or other common ways of connecting into one body can be selected. Ensuring the connection reliability between the cylinder support 21 and the connecting flange 211 is beneficial for long-term repeated use. The cylinder support 21 can be individually replaced through the connecting flange 211, or it can be considered that multiple filter mesh cylinders 200 are replaced simultaneously through one connecting flange 211, that is, multiple filter mesh cylinders 200 are fixed into one body with one connecting flange 211.

[0042] Reference Figure 6 , in one embodiment, a mating spigot 214 is provided on the side of the connecting flange 211 facing the box body 100. The mating spigot 214 is inserted into and mated with the mounting hole 105. By means of the mating spigot 214, the positioning accuracy during the installation of the connecting flange 211 is increased, which is convenient for the installation of the bolts 212, can improve the assembly efficiency, and at the same time can support and position the outer end of the cylinder support 21, improving the stability of the filter mesh cylinder 200 during operation.

[0043] In order to improve the stability of the filter mesh cylinder 200 in the screen changing cavity 103, a positioning groove 107 can be provided at the other end of the screen changing cavity 103. The inner end of the cylinder support 21 is inserted into and mated with the positioning groove 107. A connecting through hole 106 is provided on the bottom surface of the positioning groove 107, and the opening at the other end of the filter mesh cylinder 200 covers the connecting through hole 106. The positioning reliability of the cylinder support 21 is further improved, and it is further ensured that all the melt can flow into the cylinder support 21 only after being filtered by the filter screen 22.

[0044] The box body 100 includes a base body 11 and a discharge plate 12. The melt inlet flow channel 101 and the screen changing cavity 103 are provided in the base body 11, the connecting through hole 106 and the melt discharge flow channel 102 are provided in the discharge plate 12. The screen changing cavity 103 is horizontally arranged, and the discharge plate 12 is detachably fixed to one side of the base body 11. The discharge plate 12 is detachable relative to the base body 11, which is convenient for inspection and maintenance. The horizontal arrangement of the screen changing cavity 103 is beneficial for the melt to disperse and flow to the outer peripheral side of the filter screen 22 after entering the screen changing cavity 103, enabling the filter screen 22 to be evenly stressed, improving the utilization rate of the filter screen 22, and being beneficial for ensuring the filtration efficiency.

[0045] Reference Figure 6 , a heater 111 for keeping the melt in the melt inlet flow channel 101 in a molten state and a temperature sensor 112 for monitoring the heating temperature are provided on the base body 11. The heater 111 can ensure that the melt remains in a molten state, has sufficient fluidity, and keeps the melt pressure in the melt inlet flow channel 101 at an appropriate level. The temperature sensor 112 can assist in adjusting the working temperature of the heater to avoid the temperature of the heater 111 being too low or too high. The heater 111 can adopt an electric heating tube.

[0046] All the mesh-changing cavities 103 are arranged axially parallel, and the melt feed channel 101 is connected to the middle of the mesh-changing cavity 103. The disassembly directions of all the filter mesh cylinders 200 are the same, which is convenient for workers to replace. And the melt feed channel 101 is connected to the middle of the mesh-changing cavity 103, so that after the melt enters the mesh-changing cavity 103, it can be quickly dispersed to the outer periphery of the entire filter mesh cylinder 200 by using the melt pressure, reducing the influence of gravity on the melt flow. The pressure of the melt is adjusted by using the extrusion speed of the extruder, with improved controllability, which is beneficial to promoting melt filtration and improving the filtration efficiency. In order to make it easier for workers to replace the filter mesh cylinder 200, hanging ears or handles can be arranged on the outer side of the connecting flange 211, and the filter mesh cylinder 200 is laterally pulled out by using a hydraulic press or a motor drive.

[0047] Embodiment Two:

[0048] Reference Figure 7 and Figure 8 Moreover, the present invention also provides a wire drawing machine, which includes an extruder and a filter. The filter adopts the wire drawing machine filter described in any one of the above embodiments, and the inlet of the melt feed channel 101 is communicated with the discharge screw 300 of the extruder. Multiple filter mesh cylinders 200 can filter simultaneously, multiplying the filtration area. Debris is not likely to block all the filter mesh cylinders 200, which can extend the service life of the filter, reduce the replacement frequency of the filter mesh cylinders 200, decrease the shutdown times of the wire drawing machine, and ensure the working efficiency of the wire drawing machine.

[0049] In one embodiment, a belt-type screen changer 400 is connected downstream of the melt discharge channel 102, and a die head 600 is connected downstream of the belt-type screen changer 400. After rough filtration by using the filter mesh cylinder 200, fine filtration is carried out by using the belt-type screen changer 400, which can improve the filtration quality. At the same time, after the filter mesh cylinder 200 filters out large particle impurities, it can extend the service life of the belt-type screen changer 400 and reduce the screen-changing frequency of the belt-type screen changer 400. The belt-type screen changer 400 can refer to the prior art and will not be elaborated here.

[0050] In order to realize automatic adjustment of the melt pressure, a metering pump 500 can be connected downstream of the belt-type screen changer 400 and then connected to the die head 600. At the same time, a pressure sensor 301 is arranged on the discharge screw of the extruder. If the melt pressure rises, it can be detected by the pressure sensor 301 and the metering pump 500, and the extrusion speed of the extruder is reduced, thereby reducing the melt pressure. On the contrary, the extrusion speed of the extruder can be increased, thereby increasing the melt pressure, so as to realize the dynamic balance of the melt pressure.

[0051] In addition to the above preferred embodiments, the present invention has other implementation manners. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope claimed by the present invention.

Claims

1. A filter for a wire drawing machine, comprising a box body and a filter mesh cylinder. The box body is provided with a melt feed channel, a melt discharge channel and a screen changing cavity. The inlet of the melt feed channel is communicated with the discharge screw of the extruder. It is characterized in that, There are at least two of the screen-changing cavities, and the melt feeding channels communicate all the screen-changing cavities. The filter screen cylinders are inserted into the screen-changing cavities one by one. There is a flow-through gap between the outer periphery of the filter screen cylinder and the inner wall of the screen-changing cavity. The box body is provided with an installation hole communicating with one end of the screen-changing cavity, and the installation hole is for installing the filter screen cylinder. The other end of the screen-changing cavity is provided with a connection through hole communicating with the melt discharging channel. One end of the filter screen cylinder is fixed to the box body, the other end is open and abuts against the connection through hole, and the melt flows through the melt feeding channel, the screen-changing cavity, the filter screen cylinder, the connection through hole, and the melt discharging channel in sequence.

2. The filter for a wire drawing machine according to claim 1, wherein, The filter screen cylinder includes a cylinder support and a filter screen. The filter screen is sleeved on the outer periphery of the cylinder support. The outer end of the cylinder support is fixedly connected to the box body. The inner end of the cylinder support is positioned at the other end of the screen-changing cavity and is located on the outer periphery of the connection through hole. The inner hole of the cylinder support communicates with the connection through hole.

3. The filter for a wire drawing machine according to claim 2, wherein, The outer end of the cylinder support is provided with a connection flange, and the connection flange is fixedly connected to the box body to fix the filter screen cylinder and seal the installation hole.

4. The filter for a wire drawing machine according to claim 3, wherein, The cylinder support and the connection flange are integrally formed or welded and fixed; and / or, a mating stop is provided on the side surface of the connection flange facing the box body, and the mating stop is inserted into the installation hole for mating.

5. The filter for a wire drawing machine according to claim 2, characterized in that, The other end of the screen-changing cavity is provided with a positioning groove, the inner end of the cylinder support is inserted into the positioning groove for mating, the connection through hole is provided on the bottom surface of the positioning groove, and the opening at the other end of the filter screen cylinder covers the connection through hole.

6. The filter for a wire drawing machine according to claim 1, characterized in that, The box body includes a base body and a discharge plate. The melt feeding channel and the screen-changing cavity are arranged in the base body, the connection through hole and the melt discharging channel are arranged in the discharge plate. The screen-changing cavity is arranged horizontally, and the discharge plate is detachably fixed to one side of the base body.

7. The filter for a wire drawing machine according to claim 6, wherein, The base body is provided with a heater for keeping the melt in the melt feeding channel in a molten state and a temperature sensor for monitoring the heating temperature.

8. The filter for a wire drawing machine according to claim 1, wherein, The axes of all the screen-changing cavities are arranged in parallel, and the melt feeding channel is connected to the middle of the screen-changing cavity.

9. A wire drawing machine, comprising an extruder and a filter, characterized in that, The filter uses the filter for a wire drawing machine according to any one of claims 1 to 8, and the inlet of the melt feeding channel communicates with the discharge screw of the extruder.

10. The wire drawing machine according to claim 9, characterized in that, A belt type screen changer is connected downstream of the melt discharging channel, and a die head is connected downstream of the belt type screen changer.

Images