A melt filter

Abstract

The present invention relates to the technical field of filters, and specifically to a melt filter, comprising: a shell, a housing for accommodating a melt and a first hole for passing a filter assembly, the first hole passing through both ends of the shell and connected to the housing; a discharge pipe, the discharge pipe passing through the first hole and relatively fixed to the shell, and second holes evenly distributed on the discharge pipe at positions relative to the housing; a filter assembly, the filter assembly is composed of a plurality of filter discs arranged closely, the filter assembly passes through the first hole, and respectively slides in contact with the inner wall of the first hole and the outer wall of the discharge pipe, and the two ends of the filter assembly extend out of the two ends of the shell; a driving mechanism, pushing the filter assembly to move unidirectionally along the first hole, adding filter discs from one end of the filter assembly and removing filter discs from the other end, and updating the filter assembly without stopping the machine. The present invention can ensure the filtering effect while keeping the melt pressure in the filter stable, filtering smoothly, and no need to stop the machine to replace the filter screen.

Description

Technical Field

[0001] The invention relates to the technical field of filters, and in particular to a melt filter. Background Art

[0002] Melt filters are mainly used to purify plastic melts and filter out polymers, impurities, etc. in the melt to avoid affecting subsequent production. Among the existing melt filters, candle-type melt filters and disc-type melt filters are more commonly used because they use stainless steel spray-melt filters with good filtering effects. However, as the filtering process of candle-type melt filters and disc-type melt filters progresses, the number of impurities intercepted by the filters increases, and the melt pressure increases rapidly, requiring shutdown to replace the filters, affecting workshop production efficiency. Scraper-type melt filters do not require frequent screen replacement, but are restricted by processing technology, the filter accuracy is insufficient, and long-term contact between the scraper and the filter shortens the service life of the filter.

[0003] Therefore, developing a melt filter that can ensure filtering effect and does not require shutdown to replace the filter screen is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a melt filter, which transforms the disc-type melt filter to ensure the filtering effect, can keep the melt pressure in the filter stable, and filter smoothly without stopping to replace the filter, thereby ensuring the production efficiency of the workshop.

[0005] The technical solution adopted in this application to solve this technical problem is:

[0006] A melt filter, comprising:

[0007] A housing, wherein a housing cavity for accommodating the melt and a first hole for passing the filter assembly are provided in the housing, wherein the first hole passes through both ends of the housing and communicates with the housing cavity;

[0008] A discharge pipe, the discharge pipe passes through the first hole and is fixed relative to the shell, and second holes are evenly distributed on the discharge pipe at positions relative to the accommodating cavity;

[0009] A filter assembly, wherein the filter assembly is composed of a plurality of filter discs arranged closely, the filter assembly passes through the first hole, and is in sliding contact with the inner wall of the first hole and the outer wall of the discharge pipe respectively, and two ends of the filter assembly extend out of two ends of the housing respectively;

[0010] The driving mechanism pushes the filter assembly to move unidirectionally along the first hole, and the filter disc is added from one end of the filter assembly and removed from the other end, and the filter assembly is updated without stopping the machine.

[0011] In the technical solution, a filter assembly composed of a plurality of closely arranged filter discs moves in the first hole. When the filter disc reaches the first hole, a filtering effect is generated. During the movement of the filter assembly, a clean filter disc enters the first hole, and a clogged filter disc moves out of the first hole, thereby realizing non-stop updating of the filter assembly. Because the filter assembly moves during the filtering process, new filter discs always enter the accommodating cavity, and filter discs that are close to being clogged move out of the accommodating cavity. Therefore, it can be ensured that the melt pressure in the accommodating cavity is in a relatively stable state, and the filtration is smooth.

[0012] Furthermore, cooling water channels are provided in the shell on both sides of the accommodating cavity, and a heat insulation groove is provided between the cooling water channel and the accommodating cavity, and the heat insulation groove is filled with heat insulation material; the cooling water channel can keep the filter discs located on both sides of the accommodating cavity in a cooling state to avoid melt leakage, and the heat insulation material can also prevent the melt temperature in the accommodating cavity from dropping.

[0013] Furthermore, the discharge pipe is a circular tube with a closed section at one end and an opening at the other end, and a driving mechanism for driving the filter assembly to move is provided at the outer end of the closed section of the discharge pipe.

[0014] Furthermore, a guide cone is provided on the inner end of the closed section of the discharge pipe, and the tip of the guide cone is facing the open end; the guide cone is used to guide the filtered melt to avoid dead corners in the discharge pipe, thereby ensuring the cleanliness of the melt.

[0015] Furthermore, the filter disc includes an inner ring, an outer ring, a support body and a stainless steel melt-blown filter screen. The length of the inner ring is greater than that of the outer ring. An annular groove is provided on the inner wall of the inner ring. A third hole connected to the annular groove is arrayed on the inner ring. A support body and a stainless steel melt-blown filter screen are connected between the inner ring and the outer ring. The support body is a rigid annular body. Channels for the melt to flow through are evenly distributed on the support body. The channels connect the third hole and the two annular side surfaces of the support body. The stainless steel melt-blown filter screen covers the outside of the two annular side surfaces of the support body.

[0016] Furthermore, the support body is formed by sintering a ring body formed by piling up stainless steel powder; the material properties and manufacturing process of the support body are specifically disclosed. This technical solution can not only further ensure the filtering effect and supporting capacity, but also enhance heat transfer and prevent the melt from leaking along the filter disc.

[0017] Furthermore, the discharge pipe is connected to the inner wall of the first hole via a connecting strip, and a notch matching the connecting strip is provided on the filter disc.

[0018] The difference between the present technical solution and the above technical solution is that the shape of the discharge pipe is improved to ensure the stability of the mechanism. In order to match the shape change of the discharge pipe, the filter disc is improved to facilitate the rapid installation and removal of the filter disc.

[0019] Specifically, the filter disc comprises an inner ring, an outer ring, a support body and a stainless steel melt-blown filter screen, the inner ring, outer ring, support body and stainless steel melt-blown filter screen of the filter disc are all circular ring bodies with notches, the length of the inner ring is greater than that of the outer ring, an annular groove with a notch is provided on the inner wall of the inner ring, a third hole connected to the annular groove is arrayed on the inner ring, a support body and a stainless steel melt-blown filter screen are connected between the inner ring and the outer ring, channels for the melt to flow through are evenly distributed on the support body, the channels connect the third hole and two side surfaces of the support body, and the stainless steel melt-blown filter screen covers the outside of the two side surfaces of the support body; a straight pipe section and two variable cross-section pipe sections are provided on the discharge pipe, the two variable cross-section pipe sections are respectively located on both sides of the outer shell, a straight pipe section is connected between the two variable cross-section pipe sections, the variable cross-section pipe section is used to pass through the notch of the filter disc, and the variable cross-section pipe section and the straight pipe section have a smooth transition; further eliminating the flow dead angle in the discharge pipe.

[0020] Furthermore, the inner ring, outer ring, support body and stainless steel melt-blown filter of the filter disc are all annular bodies with notches, and a closing plate for closing the end face of the notch of the support body is provided at the notch of the filter disc, and the two ends of the closing plate are connected to the end of the inner ring and the end of the outer ring.

[0021] The inner ring, outer ring and closing plate are in sliding contact with the outer wall of the discharge pipe, the inner wall of the first hole and the side wall of the connecting strip respectively, which can prevent the melt from leaking and close the gap of the support body to prevent the unfiltered melt from entering the filter disc.

[0022] Furthermore, two clamping mechanisms are provided on the outer side of the shell, and each clamping assembly clamps the filter discs on both sides of the shell to keep the filter discs in a tightly arranged state, or one clamping mechanism maintains a clamping state while the other clamping mechanism is idle.

[0023] The clamping assembly is used to maintain a tightly arranged state, and mainly plays a role in preventing the filter disc from loosening during the updating process of the filter assembly, causing the melt to enter the discharge pipe without being filtered.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention utilizes the movement of the filter assembly between the discharge pipe and the housing to achieve the effect of stabilizing the melt pressure, wherein the filter assembly is composed of a plurality of filter discs arranged closely, and when a part of the filter discs of the filter assembly moves out of the first hole, the filter discs can be conveniently replaced without stopping the machine, that is, the net can be replaced without stopping the machine; because the filter assembly moves during the filtration process, new filter discs always enter the accommodating chamber, and the filter discs that are close to being blocked are moved out of the accommodating chamber, thereby ensuring that the melt pressure in the accommodating chamber is in a relatively stable state and the filtration is smooth.

[0026] 2. The driving mechanism of the present invention realizes the movement of the filter assembly, wherein the driving mechanism can move intermittently or slowly in steps, and the moving state can be flexibly selected according to actual production.

[0027] 3. The present invention changes the shape of the filter disc. Compared with the circular filter disc in the prior art, the filter disc with a notch is more convenient to use, and is quick and easy to install and remove.

[0028] 4. The present invention also provides two clamping mechanisms for assisting in updating the filter assembly, which prevent the filter disc from becoming loose and causing the melt to enter the discharge pipe without being filtered during the updating process of the filter assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 It is a front view of the present invention;

[0031] Figure 3 is a sectional front view of the present invention;

[0032] Figure 4 yes Figure 3 AA section view;

[0033] Figure 5 It is a schematic structural diagram of the connection between the discharge pipe and the connecting strip of the present invention;

[0034] Figure 6 It is a sectional front view of the connection between the discharge pipe and the connecting strip of the present invention;

[0035] Figure 7 is a schematic diagram of the structure of the filter disc of the present invention (partial cross-section);

[0036] Figure 8 It is a cross-sectional front view of the filter disc of the present invention.

[0037] The numbers in the accompanying drawings are: 1. outer shell; 2. discharge pipe; 3. melt feed port; 4. accommodating chamber; 5. first hole; 6. second hole; 7. filter disc; 8. driving mechanism; 9. cooling water channel; 10. insulation groove; 11. inner ring; 12. outer ring; 13. support body; 14. stainless steel spray-melt filter; 15. annular groove; 16. third hole; 17. connecting strip; 18. straight pipe section; 19. variable cross-section pipe section; 20. closing plate; 21. clamping mechanism; 22. clamping end; 23. connecting rod. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, a melt filter comprises: a shell 1, a discharge pipe 2 and a filter assembly, wherein the shell 1 is formed by connecting a plurality of modules, including two middle modules and two side modules, wherein one middle module is provided with a melt feed port 3, and the two middle modules are butted up and down to form a module body with a receiving cavity 4, and the receiving cavity 4 is connected to the melt feed port 3 for receiving the melt, and a side module with a hole is connected to each side of the module body to form the shell 1, and the holes of the two side modules are coaxial to form a first hole 5 for the filter assembly to pass through, and the discharge pipe 2 passes through the first hole 5 Relatively fixed to the outer shell 1, the discharge pipe 2 is evenly provided with second holes 6 at the position relative to the accommodating chamber 4, and the second holes 6 are for the filtered melt to pass through; the filter assembly is composed of a plurality of filter discs 7 arranged closely, the filter assembly passes through the first hole 5, and is in sliding contact with the inner wall of the first hole 5 and the outer wall of the discharge pipe 2 respectively, and the two ends of the filter assembly extend out of the two ends of the outer shell 1 respectively. The filter assembly moves unidirectionally along the first hole 5 under the push of the driving mechanism 8, and the filter disc 7 is added from one end of the filter assembly and removed from the other end to realize the non-stop update of the filter assembly.

[0040] like Figure 3 As shown, the shell 1 is provided with cooling water channels 9 located on both sides of the accommodating cavity 4, and the cooling water channels are located on two side modules. A heat insulation groove 10 is provided between the cooling water channel 9 and the accommodating cavity 4, and the heat insulation groove is arranged inside the side module and between the side module and the middle module. The heat insulation groove 10 is filled with heat insulation material, and the heat insulation material separates the cooling water channel 9 from the accommodating cavity 4 to prevent the coldness of the cooling water channel 9 from causing the melt in the accommodating cavity 4 to condense; the cooling water channel 9 can keep the filter discs 7 located on both sides of the accommodating cavity 4 in a cooling state to avoid melt leakage, and the heat insulation material can also prevent the melt temperature in the accommodating cavity 4 from dropping.

[0041] like Figure 2 , Figure 5 and Figure 6 As shown, the discharge pipe 2 is a circular tube with a closed section at one end, and the closed section is formed by filling a plugging material (such as a column made of stainless steel, a column composed of cement filled at the end of the discharge pipe) in one end of the discharge pipe 2, the inner end of the closed section is located inside the shell 1, and the other end is located at the end of the discharge pipe 2, and the outer end of the closed section of the discharge pipe 2 is provided with a driving mechanism 8 for moving the filter assembly, and the driving mechanism 8 is an electric telescopic rod or a cylinder, and its telescopic end is connected to the discharge pipe 2, and a pushing mechanism for pushing the filter assembly is connected to the cylinder body, and the pushing mechanism includes a push rod and a push plate, the push rod is directly connected to the cylinder body, and the end of the push rod is connected to the push plate, and the push plate is in contact with the filter assembly.

[0042] like Figure 2 As shown, the inner end of the closed section of the discharge pipe 2 is aligned with the end of the accommodating cavity 4, and a guide cone connected to the inner end of the closed section is provided in the discharge pipe 2, that is, a guide cone corresponding to the accommodating cavity 4 is provided on the inner end of the closed section of the discharge pipe 2, and at most the tip of the guide cone is facing the open end of the discharge pipe.

[0043] As an embodiment of the present invention, there are many ways to relatively fix the outer shell 1 and the discharge pipe 2. For example, the outer shell 1 is fixed on a part of a supporting device, the discharge pipe 2 is detachably connected to another part of a supporting device, and the filter disc 7 is a circular ring body composed of two semicircular rings connected together, which is disassembled and separated after being moved out of the first hole 5, or the filter disc 7 is disposable and is directly disassembled by destructive means after being moved out of the first hole 5. In this way, the outer shell 1 is not directly connected to the discharge pipe 2, the filter disc 7 is in the shape of a ring, and the filter component can be updated without stopping the machine.

[0044] like Figure 4 , Figure 7 and Figure 8 As shown, the filter disc 7 includes an inner ring 11, an outer ring 12, a support body 13 and a stainless steel melt-blown filter screen 14. The length of the inner ring 11 is greater than that of the outer ring 12. The "length" here refers to the dimension along the axial direction. An annular groove 15 is provided on the inner wall of the inner ring 11. The inner ring 11 is arrayed with a third hole 16 connected to the annular groove 15. The support body 13 and the stainless steel melt-blown filter screen 14 are connected between the inner ring 11 and the outer ring 12. The support body 13 is a rigid annular body. The support body 13 is evenly distributed with channels for the melt to flow through. The channels connect the third hole 16 and the two annular side surfaces of the support body 13. The stainless steel melt-blown filter screen 14 covers the outside of the two annular side surfaces of the support body 13.

[0045] The support body 13 is formed by sintering stainless steel powder after being piled up to form a circular ring. The diameter of the stainless steel powder is 80-100 mesh, which can not only maintain sufficient support but also form gaps between the powders. The gaps between the stainless steel powders constitute a channel for the melt to flow through. The diameter of the channel is larger than the mesh diameter of the stainless steel spray-melt filter 14. The material properties and manufacturing method of the support body 13 are specifically disclosed. The technical solution can further ensure the filtering effect and support capacity while enhancing heat transfer to prevent the melt from leaking along the filter disc 7.

[0046] As another embodiment of the present invention, Figure 2 , Figure 5 and Figure 6 As shown, the discharge pipe 2 is connected to the inner wall of the first hole 5 via a connecting strip 17. The connecting strip 17 is a rod-shaped body along the length direction of the discharge pipe 2. The cross section of the connecting strip 17 is a fan ring or a rectangle. Figure 7 and Figure 8 As shown, the discharge pipe 2 is connected to the inner wall of the first hole 5 via a connecting strip 17, and the filter disc 7 is provided with a notch that matches the connecting strip 17; the filter disc 7 includes an inner ring 11, an outer ring 12, a support body 13 and a stainless steel melt-blown filter screen 14, and the inner ring 11, the outer ring 12, the support body 13 and the stainless steel melt-blown filter screen 14 of the filter disc 7 are all annular bodies with notches, the length of the inner ring 11 is greater than the length of the outer ring 12, an annular groove 15 with a notch is provided on the inner wall of the inner ring 11, and a third hole 16 connected to the annular groove 15 is arrayed on the inner ring 11, and a support is connected between the inner ring 11 and the outer ring 12. A support body 13 and a stainless steel melt-blown filter screen 14, the support body 13 is evenly distributed with channels for the melt to flow through, the channels connect the third hole 16 and the two side surfaces of the support body 13, the stainless steel melt-blown filter screen 14 covers the two side surfaces of the support body 13; the discharge pipe 2 is provided with a straight pipe section 18 and two variable cross-section pipe sections 19, the two variable cross-section pipe sections 19 are respectively located on both sides of the outer shell 1, and the two variable cross-section pipe sections 19 are connected by a straight pipe section 18, and the variable cross-section pipe section 19 is used to pass through the gap of the filter disc 7; the technical solution can ensure the stability of the mechanism and facilitate the rapid installation and removal of the filter disc 7.

[0047] like Figure 5 and Figure 6 As shown, the variable cross-section pipe section 19 and the straight pipe section 18 transition smoothly, further eliminating the flow dead corner in the discharge pipe 2.

[0048] The inner ring 11, outer ring 12, support body 13 and stainless steel melt-blown filter screen 14 of the filter disc 7 are all annular bodies with notches. A closing plate 20 for closing the end face of the notch of the support body 13 is provided at the notch of the filter disc 7. The two ends of the closing plate 20 connect the end of the inner ring 11 and the end of the outer ring 12.

[0049] The inner ring 11, the outer ring 12 and the closing plate 20 are in sliding contact with the outer wall of the discharge pipe 2, the inner wall of the first hole 5 and the side wall of the connecting strip 17 respectively, which can prevent the melt from leaking and close the gap of the support body 13 to prevent the unfiltered melt from entering the filter disc 7.

[0050] like Figure 2 and Figure 3 As shown, two clamping mechanisms 21 are provided on the outer side of the housing 1, and each clamping assembly is clamped on the filter discs 7 on both sides of the housing 1 to keep the filter discs 7 in a tightly arranged state, or one clamping mechanism 21 is kept in a clamping state and the other clamping mechanism 21 is idle, which is used to assist in updating the filter assembly.

[0051] The clamping mechanism 21 includes two clamping ends 22 and a connecting rod 23. The two clamping ends 22 are connected to the connecting rod 23. The distance between the two clamping ends 22 on the connecting rod 23 is adjustable. There are many elements for adjusting the distance and their connection methods in the prior art, which will not be repeated here.

[0052] The clamping assembly is used to maintain a tightly arranged state, and mainly plays a role in preventing the filter disc 7 from becoming loose during the process of updating the filter assembly, thereby causing the melt to enter the discharge pipe 2 without being filtered.

[0053] The use process of the present invention is as follows:

[0054] During normal filtering, the driving mechanism 8 pushes the filter assembly to the left, so that new filter discs 7 continuously enter the accommodating chamber 4 and the filter discs 7 that are close to being blocked are continuously discharged from the first hole 5, so as to maintain the stability of the melt pressure and filtering effect inside the accommodating chamber 4. When a large number of filter discs 7 are discharged or the driving mechanism runs to its limit (the oil cylinder shrinks to its limit state in this embodiment), it is necessary to add a new filter disc 7 to the left part of the discharge pipe 2, and the driving mechanism 8 shrinks to remove the blocked filter disc 7 from the right part of the discharge pipe 2. At this time, the left end of the idle clamping mechanism 21 is close to the outer shell 1, and the right end is close to the right side of the newly added filter disc 7 to clamp the filter assembly, and the clamping mechanism 21 that originally maintains the clamping state is removed, and the filter disc 7 is removed from the left part of the discharge pipe 2 to complete the update of the filter assembly, that is, the net is changed without stopping the machine.

[0055] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

Claims

1. A melt filter, characterized in that: include: A housing (1), wherein a receiving cavity (4) for receiving the melt and a first hole (5) for passing the filter assembly are provided in the housing (1), wherein the first hole (5) passes through both ends of the housing (1) and is connected to the receiving cavity (4); A discharge pipe (2), the discharge pipe (2) passing through the first hole (5) and being fixed relative to the housing (1), and second holes (6) being evenly distributed on the discharge pipe (2) at positions relative to the accommodating cavity (4); A filter assembly, the filter assembly being composed of a plurality of filter discs (7) arranged closely together, the filter assembly passing through the first hole (5) and respectively in sliding contact with the inner wall of the first hole (5) and the outer wall of the discharge pipe (2), and two ends of the filter assembly respectively extending out of two ends of the housing (1); A driving mechanism (8), wherein the driving mechanism (8) drives the filter assembly to move unidirectionally along the first hole (5), and a filter disc (7) is added from one end of the filter assembly and the filter disc (7) is removed from the other end, thereby realizing non-stop updating of the filter assembly; The discharge pipe (2) is a circular tube having a closed section at one end and an opening at the other end; the outer end of the closed section of the discharge pipe (2) extends out of the housing (1) and is provided with a driving mechanism (8) for driving the filter assembly to move; The discharge pipe (2) is connected to the inner wall of the first hole (5) via a connecting strip (17), and the filter disc (7) is provided with a notch that matches the connecting strip (17); The filter disc (7) comprises an inner ring (11), an outer ring (12), a support body (13) and a stainless steel melt-blown filter screen (14). The inner ring (11), the outer ring (12), the support body (13) and the stainless steel melt-blown filter screen (14) of the filter disc (7) are all annular bodies with notches. The length of the inner ring (11) is greater than the length of the outer ring (12). Here, "length" refers to the dimension along the axial direction. An annular groove (15) with a notch is provided on the inner wall of the inner ring (11). The inner ring (11) is provided with a third hole (16) connected to the annular groove (15). The inner ring (11) and the outer ring (12) are connected by a A support body (13) and a stainless steel melt-blowing filter screen (14), wherein the support body (13) is evenly provided with channels for the melt to flow through, wherein the channels are connected to the third hole (16) and two side surfaces of the support body (13), and the stainless steel melt-blowing filter screen (14) covers the two side surfaces of the support body (13); a straight pipe section (18) and two variable cross-section pipe sections (19) are provided on the discharge pipe (2), wherein the two variable cross-section pipe sections (19) are respectively located on both sides of the housing (1), and a straight pipe section (18) is connected between the two variable cross-section pipe sections (19), and the variable cross-section pipe section (19) is used to pass through the gap of the filter disc (7); A closing plate (20) is provided at the notch of the filter disc (7) for closing the end surface of the notch of the support body (13), and two ends of the closing plate (20) are connected to the end of the inner ring (11) and the end of the outer ring (12); The inner ring (11), the outer ring (12) and the closing plate (20) are in sliding contact with the outer wall of the discharge pipe (2), the inner wall of the first hole (5) and the side wall of the connecting strip (17) respectively, so as to prevent the melt from leaking and at the same time seal the gap of the support body (13), thereby preventing the unfiltered melt from entering the filter disc (7).

2. The melt filter according to claim 1, characterized in that The housing (1) is provided with cooling water channels (9) located on both sides of the accommodating cavity (4), a heat insulation groove (10) is provided between the cooling water channel (9) and the accommodating cavity (4), and the heat insulation groove (10) is filled with heat insulation material.

3. The melt filter according to claim 1, characterized in that A guide cone is provided on the inner end of the closed section of the discharge pipe (2), and the tip of the guide cone faces the open end of the discharge pipe (2).

4. The melt filter according to claim 1, characterized in that Two clamping mechanisms (21) are provided on the outside of the housing (1), and each clamping assembly is clamped on the filter discs (7) on both sides of the housing (1), so that the filter discs (7) remain in a tightly arranged state.

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