Cast film extrusion liquid filtering device

Abstract

The utility model relates to a cast film extrusion liquid filtering device, and belongs to the technical field of cast film production. An inter-filter-screen connecting piece is arranged between the front connecting pipe and the rear connecting pipe, a first-stage filter screen assembly and a second-stage filter screen assembly are arranged on the inter-filter-screen connecting piece at intervals, and the front connecting pipe, the first-stage filter screen assembly, the inter-filter-screen connecting piece, the second-stage filter screen assembly and the rear connecting pipe are concentrically arranged. And the aperture of the primary filter screen assembly is larger than that of the secondary filter screen assembly. The utility model has the following beneficial effects: two-stage filtration combination is adopted, coarse filtration is firstly carried out, then fine filtration is carried out, the filtration liquid passing amount is large, impurities in casting film extrusion liquid can be filtered more layer by layer during filtration, the filtration effect is improved, and later cleaning and maintenance are facilitated.

Description

Technical Field

[0001] The utility model relates to a casting film extrusion liquid filtering device, belonging to the casting film production technical field. Background Art

[0002] When the cast film machine is working, impurities mixed into the molten plastic not only affect the product quality, but also hinder normal production. For this reason, a filtering device is provided between the extruder head and the cast film die head of the cast film machine to separate and remove impurities, ensure product quality and stabilize production.

[0003] The patent application with patent number CN201820732939.0 discloses a cast film extrusion liquid filtering device. It includes a filter screen, a filter screen fixing plate, a cylinder, and a filter screen fixing frame. The filter screen fixing plate is slidably installed between the upper and lower guide rails of the filter screen fixing frame. Two filter screens are symmetrically fixed on the filter screen fixing plate by a screwing mechanism. The right end of the filter screen fixing plate is connected to the piston rod of a cylinder. The screwing mechanism includes an external threaded sleeve and an internal threaded sleeve. A filter screen mounting hole is formed on the filter screen fixing plate. An external threaded sleeve is formed on the outer side of the filter screen fixing plate around the filter screen mounting hole. An internal threaded sleeve is meshed and connected to the outer side of the external threaded sleeve. The end face of the internal threaded sleeve is L-shaped and is spaced a certain distance from the external threaded sleeve on the inner side for clamping the filter screen.

[0004] Although the filtering effect of the above patent is acceptable, the current technical considerations are not comprehensive and have the following disadvantages: after a period of use, the single-stage filter assembly is very easy to be clogged, which will cause the filtration flow rate to decrease and increase the pressure in the pipe, making it difficult to drain the liquid.

[0005] In order to solve one of the above problems, a cast membrane extrusion liquid filtering device is urgently needed. Utility Model Content

[0006] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is: how to achieve a two-stage filtration combination, first coarse filtration and then fine filtration, to improve the filtration effect and be more conducive to later cleaning and maintenance, and for this purpose a cast membrane extrusion liquid filtration device is provided.

[0007] The cast membrane extrusion liquid filtering device described in the utility model is characterized in that the cast membrane extrusion liquid filtering device comprises a front connecting pipe and a rear connecting pipe, the front end of the front connecting pipe is an inlet, which is used to connect with the cast membrane extruder and receive the cast membrane extrusion liquid, and a front connecting flange is installed at the inlet, and is characterized in that: a filter screen connecting piece is arranged between the front connecting pipe and the rear connecting pipe, and a primary filter screen assembly and a secondary filter screen assembly are arranged on the filter screen connecting piece at intervals, the front connecting pipe, the primary filter screen assembly, the filter screen connecting piece, the secondary filter screen assembly and the rear connecting pipe are arranged concentrically, and the aperture of the primary filter screen assembly is larger than the aperture of the secondary filter screen assembly.

[0008] A two-stage filtration combination is adopted, with coarse filtration first and then fine filtration. The filtration liquid volume is large and the impurities in the cast membrane extrudate can be filtered out layer by layer during filtration, which improves the filtration effect and is more conducive to later cleaning and maintenance.

[0009] Preferably, the filter screen connecting piece includes an intermediate pipe section with a central channel, the front end of the intermediate pipe section is arranged as a front connecting head section A which is plugged into and matched with the front connecting pipe, the front connecting pipe is inserted into the front connecting head section A, the connection between the front connecting head section A and the inner hole of the intermediate pipe section is a step platform A, and the first-level filter screen assembly is abutted against the step platform A through the front connecting pipe; a plurality of groups of connecting screws A are installed on the outer circumference of the front connecting head section A, the front connecting pipe is provided with an outer sleeve A which is plugged into and matched with the front connecting head section A, the front connecting head section A is inserted into the gap between the front connecting pipe and the outer sleeve A, a connecting ring A is provided on the outer wall of the outer sleeve A, a through hole A which is matched with the connecting screw A is provided on the connecting ring A, the connecting screw A passes through the corresponding through hole A, and a first locking nut and a second locking nut are threadedly connected to the connecting screw A, and the first locking nut and the second locking nut clamp the connecting ring A in the middle.

[0010] The connection between the filter screen connector and the front connecting pipe and the rear connecting pipe is mainly plug-in, supplemented by nuts and screws. This can not only achieve precise fixation of the primary filter screen assembly and the secondary filter screen assembly, and the sealing meets the requirements, but also the primary filter screen assembly, the filter screen connector and the secondary filter screen assembly can be dismantled and cleaned to ensure the use effect.

[0011] Preferably, multiple groups of connecting screws A are arranged around the center line of the front connecting head section A.

[0012] Preferably, a first sealing ring is provided between the front connecting head section A and the outer sleeve A.

[0013] Preferably, the primary filter assembly comprises an insert pipe A, one end of which is provided with a tail baffle ring A, the inside of which is a filter screen A, and the tail baffle ring A is abutted against the step platform A through a front connecting pipe.

[0014] Preferably, the front end of the rear connecting pipe is configured as a front connecting head section B that is plugged into and matched with the rear connecting head section, the rear connecting head section is inserted into the front connecting head section B, and the connection between the front connecting head section B and the inner hole of the rear connecting pipe is a step platform B, and the secondary filter screen assembly is abutted against the step platform B through the rear connecting head section; multiple groups of connecting screws B are installed on the outer circumference of the front connecting head section B, and the rear connecting head section is provided with an outer sleeve B that is plugged into and matched with the front connecting head section B, the front connecting head section B is inserted into the gap between the rear connecting head section and the outer sleeve B, and a connecting ring B is provided on the outer wall of the outer sleeve B, and a through hole B that cooperates with the connecting screw B is provided on the connecting ring B, the connecting screw B passes through the corresponding through hole B, and a third locking nut and a fourth locking nut are threadedly connected to the connecting screw B, and the third locking nut and the fourth locking nut clamp the connecting ring B in the middle.

[0015] Preferably, multiple groups of connecting screws B are arranged around the center line of the front connecting head section B.

[0016] Preferably, a second sealing ring is provided between the front connecting head section B and the outer sleeve B.

[0017] Preferably, the first-stage filter screen assembly includes a plug tube B, one end of which is provided with a tail baffle ring B, the inside of which is a filter screen B, and the tail baffle ring B is abutted against the step platform B through the rear connecting head section.

[0018] Preferably, electric heating wires are respectively wound along the length direction of the front connecting tube and the length direction of the rear connecting tube.

[0019] Preferably, a rear connecting flange is provided at the tail end of the rear connecting pipe, and the rear connecting flange is connected to an outlet elbow, and the other end of the outlet elbow is a discharge port.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The cast membrane extrusion liquid filtering device described in the utility model mainly adopts plug-in connection and supplemented by nuts and screws between the filter screen connectors and the front connecting pipe and the rear connecting pipe. It can not only realize the precise fixation of the primary filter screen assembly and the secondary filter screen assembly, and the sealing performance meets the requirements, but also the primary filter screen assembly, the filter screen connector and the secondary filter screen assembly can be dismantled and cleaned to ensure the use effect.

[0022] The cast film extrusion liquid filtering device described in the utility model, the first-level filter screen assembly includes a plug tube A, one end of the plug tube A is provided with a tail baffle ring A, the tail baffle ring A is inside the filter screen A, and the tail baffle ring A is connected to the step platform A through the front connecting pipe, which is convenient for disassembly and assembly.

[0023] The cast membrane extrusion liquid filtering device of the utility model adopts a two-stage filtering combination, which performs coarse filtering first and fine filtering later. The filtering liquid flow rate is large and impurities in the cast membrane extrusion liquid can be filtered out layer by layer during filtering, thereby improving the filtering effect and being more conducive to later cleaning and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the filter screen connector of the utility model;

[0027] Figure 3 This is a schematic diagram of the internal structure of the primary filter assembly of the utility model;

[0028] In the figure: 1, front connecting pipe 1.1, outer sleeve A 1.2, connecting ring A 2, primary filter screen assembly 2.1, insert pipe A2.2, tail retaining ring A 2.3, filter screen A 3, filter screen connecting piece 3.1, intermediate pipe section 3.2, front connecting head section A 3.3, rear connecting head section 3.4, connecting screw A 3.5, first locking nut 3.6, second locking nut 4, secondary filter screen assembly 5, rear connecting pipe 6, front connecting flange 7, rear connecting flange 8, outlet elbow 9, first sealing ring. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings: The utility model is further illustrated below through specific embodiments, but is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the invention should be included in the protection scope of the utility model.

[0030] Embodiment 1, as Figure 1-2As shown, the cast membrane extrusion liquid filtering device comprises a front connecting pipe 1 and a rear connecting pipe 5, the front end of the front connecting pipe 1 is an inlet, which is used to connect with the cast membrane extruder and receive the cast membrane extrusion liquid, and a front connecting flange 6 is installed at the inlet, a filter screen connector 3 is arranged between the front connecting pipe 1 and the rear connecting pipe 5, a primary filter screen assembly 2 and a secondary filter screen assembly 4 are arranged on the filter screen connector 3 at intervals, the front connecting pipe 1, the primary filter screen assembly 2, the filter screen connector 3, the secondary filter screen assembly 4 and the rear connecting pipe 5 are concentrically arranged, and the aperture of the primary filter screen assembly 2 is larger than the aperture of the secondary filter screen assembly 4.

[0031] A two-stage filtration combination is adopted, with coarse filtration first and then fine filtration. The filtration liquid volume is large and the impurities in the cast membrane extrudate can be filtered out layer by layer during filtration, which improves the filtration effect and is more conducive to later cleaning and maintenance.

[0032] Embodiment 2, as Figure 1-3 As shown, the cast membrane extrusion liquid filtering device comprises a front connecting pipe 1 and a rear connecting pipe 5, the front end of the front connecting pipe 1 is an inlet, which is used to connect with the cast membrane extruder and receive the cast membrane extrusion liquid, and a front connecting flange 6 is installed at the inlet, a filter screen connector 3 is arranged between the front connecting pipe 1 and the rear connecting pipe 5, a primary filter screen assembly 2 and a secondary filter screen assembly 4 are arranged on the filter screen connector 3 at intervals, the front connecting pipe 1, the primary filter screen assembly 2, the filter screen connector 3, the secondary filter screen assembly 4 and the rear connecting pipe 5 are concentrically arranged, and the aperture of the primary filter screen assembly 2 is larger than the aperture of the secondary filter screen assembly 4.

[0033] Furthermore, the filter screen connector 3 includes an intermediate pipe section 3.1 with a central hole, the front end of the intermediate pipe section 3.1 is configured as a front connecting head section A3.2 that is plugged into the front connecting pipe 1, the front connecting pipe 1 is inserted into the front connecting head section A3.2, and the connection between the front connecting head section A3.2 and the inner hole of the intermediate pipe section 3.1 is a step platform A, and the first-level filter screen assembly 2 is abutted against the step platform A through the front connecting pipe 1; multiple groups of connecting screws A3.4 are installed on the outer circumference of the front connecting head section A3.2, and the front connecting pipe 1 is provided with a plurality of connecting screws A3.4 that are plugged into the front connecting head section A 3.2 is inserted directly into the outer sleeve A1.1, and the front connecting head section A3.2 is inserted into the gap between the front connecting tube 1 and the outer sleeve A1.1. A connecting ring A1.2 is arranged on the outer wall of the outer sleeve A1.1, and a through hole A matching with the connecting screw A3.4 is arranged on the connecting ring A1.2. The connecting screw A3.4 passes through the corresponding through hole A, and the first locking nut 3.5 and the second locking nut 3.6 are threadedly connected on the connecting screw A3.4, and the first locking nut 3.5 and the second locking nut 3.6 clamp the connecting ring A1.2 in the middle.

[0034] The connection between the filter screen connector 3 and the front connecting pipe 1 and the rear connecting pipe 5 is mainly plug-in, supplemented by nuts and screws. This can not only achieve accurate fixation of the primary filter screen assembly 2 and the secondary filter screen assembly 4, and the sealing meets the requirements, but also the primary filter screen assembly 2, the filter screen connector 3 and the secondary filter screen assembly 4 can be dismantled and cleaned to ensure the use effect.

[0035] Furthermore, a plurality of groups of connecting screws A3.4 are arranged around the center line of the front connecting head section A3.2.

[0036] Furthermore, a first sealing ring 9 is provided between the front connecting head section A3.2 and the outer sleeve A1.1.

[0037] Furthermore, the primary filter assembly 2 comprises an insert pipe A2.1, one end of which is provided with a tail retaining ring A2.2, a filter screen A2.3 is contained in the tail retaining ring A2.2, and the tail retaining ring A2.2 is abutted against the step A through the front connecting pipe 1. It is convenient to disassemble and assemble.

[0038] Furthermore, the front end of the rear connecting pipe 5 is configured as a front connecting head section B that is plugged into and matched with the rear connecting head section 3.3, the rear connecting head section 3.3 is inserted into the front connecting head section B, and the connection between the front connecting head section B and the inner hole of the rear connecting pipe 5 is a step platform B, and the secondary filter screen assembly 4 is abutted against the step platform B through the rear connecting head section 3.3; multiple groups of connecting screws B are installed on the outer circumference of the front connecting head section B, and the rear connecting head section 3.3 is provided with an outer sleeve B that is plugged into and matched with the front connecting head section B, the front connecting head section B is inserted into the gap between the rear connecting head section 3.3 and the outer sleeve B, and a connecting ring B is provided on the outer wall of the outer sleeve B, and a through hole B is provided on the connecting ring B that matches with the connecting screw B, the connecting screw B passes through the corresponding through hole B, and a third locking nut and a fourth locking nut are threadedly connected to the connecting screw B, and the third locking nut and the fourth locking nut clamp the connecting ring B in the middle.

[0039] Furthermore, a plurality of groups of connecting screws B are arranged around the center line of the front connecting head section B.

[0040] Furthermore, a second sealing ring is provided between the front connecting head section B and the outer sleeve B.

[0041] Furthermore, the primary filter screen assembly 2 comprises a plug tube B, one end of which is provided with a tail retaining ring B, inside of which is a filter screen B, and the tail retaining ring B is abutted against the step platform B through the rear connecting head section 3.3.

[0042] Furthermore, electric heating wires are respectively wound along the length direction of the front connecting tube 1 and the length direction of the rear connecting tube 5 .

[0043] Furthermore, a rear connecting flange 7 is provided at the tail end of the rear connecting pipe 5, and the rear connecting flange 7 is connected to an outlet elbow 8, and the other end of the outlet elbow 8 is a discharge port.

[0044] The cast membrane extrusion liquid filtering device described in the utility model mainly adopts plug-in connection and supplemented by nuts and screws between the filter screen connectors and the front connecting pipe and the rear connecting pipe. It can not only realize the precise fixation of the primary filter screen assembly and the secondary filter screen assembly, and the sealing performance meets the requirements, but also the primary filter screen assembly, the filter screen connector and the secondary filter screen assembly can be dismantled and cleaned to ensure the use effect.

[0045] The cast film extrusion liquid filtering device described in the utility model, the first-level filter screen assembly includes a plug tube A, one end of the plug tube A is provided with a tail baffle ring A, the tail baffle ring A is inside the filter screen A, and the tail baffle ring A is connected to the step platform A through the front connecting pipe, which is convenient for disassembly and assembly.

[0046] The cast membrane extrusion liquid filtering device of the utility model adopts a two-stage filtering combination, which performs coarse filtering first and fine filtering later. The filtering liquid flow rate is large and impurities in the cast membrane extrusion liquid can be filtered out layer by layer during filtering, thereby improving the filtering effect and being more conducive to later cleaning and maintenance.

[0047] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the present utility model is defined by the attached claims and their equivalents.

[0048] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A cast film extrusion liquid filtering device, comprising a front connecting pipe and a rear connecting pipe, wherein the front end of the front connecting pipe is an inlet for connecting with a cast film extruder to receive the cast film extrusion liquid, and a front connecting flange is installed at the inlet, characterized in that: A filter screen connector is provided between the front connecting pipe and the rear connecting pipe, and a primary filter screen assembly and a secondary filter screen assembly are arranged at intervals on the filter screen connector. The front connecting pipe, the primary filter screen assembly, the filter screen connector, the secondary filter screen assembly and the rear connecting pipe are arranged concentrically, and the aperture of the primary filter screen assembly is larger than the aperture of the secondary filter screen assembly.

2. The cast membrane extrudate filtration device according to claim 1, characterized in that: The filter screen connecting piece includes an intermediate pipe section with a central channel, and the front end of the intermediate pipe section is arranged as a front connecting head section A which is plugged into and matched with the front connecting pipe, the front connecting pipe is inserted into the front connecting head section A, and the connection between the front connecting head section A and the inner hole of the intermediate pipe section is a step platform A, and the first-level filter screen assembly is abutted against the step platform A through the front connecting pipe; a plurality of groups of connecting screws A are installed on the outer circumference of the front connecting head section A, and the front connecting pipe is provided with an outer sleeve A which is plugged into and matched with the front connecting head section A, the front connecting head section A is inserted into the gap between the front connecting pipe and the outer sleeve A, and a connecting ring A is provided on the outer wall of the outer sleeve A, and a through hole A which is matched with the connecting screw A is provided on the connecting ring A, and the connecting screw A passes through the corresponding through hole A, and a first locking nut and a second locking nut are threadedly connected to the connecting screw A, and the first locking nut and the second locking nut clamp the connecting ring A in the middle.

3. The cast membrane extrudate filtration device according to claim 2, characterized in that: A plurality of connecting screws A are arranged around the center line of the front connecting head section A.

4. The cast membrane extrudate filtration device according to claim 3, characterized in that: A first sealing ring is provided between the front connecting head section A and the outer sleeve A.

5. The cast membrane extrudate filtration device according to claim 4, characterized in that: The front end of the rear connecting pipe is configured as a front connecting head section B that is plugged into and matched with the rear connecting head section, the rear connecting head section is inserted into the front connecting head section B, and the connection between the front connecting head section B and the inner hole of the rear connecting pipe is a step platform B, and the secondary filter screen assembly is abutted against the step platform B through the rear connecting head section; a plurality of groups of connecting screws B are installed on the outer circumference of the front connecting head section B, and the rear connecting head section is provided with an outer sleeve B that is plugged into and matched with the front connecting head section B, the front connecting head section B is inserted into the gap between the rear connecting head section and the outer sleeve B, a connecting ring B is provided on the outer wall of the outer sleeve B, a through hole B that is matched with the connecting screw B is provided on the connecting ring B, the connecting screw B passes through the corresponding through hole B, and a third locking nut and a fourth locking nut are threadedly connected to the connecting screw B, and the third locking nut and the fourth locking nut clamp the connecting ring B in the middle.

6. The cast membrane extrudate filtration device according to claim 5, characterized in that: A plurality of connecting screws B are arranged around the center line of the front connecting head section B.

7. The cast membrane extrudate filtration device according to claim 6, characterized in that: A second sealing ring is provided between the front connecting head section B and the outer sleeve B.

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