Extrusion device for PP melt-blown granules

Abstract

The invention relates to the technical field of PP melt-blowing production equipment, and discloses a PP melt-blowing granule extrusion device which comprises a production platform, an extruder is arranged at the top of the production platform, the discharging end of the extruder is connected with a material injection pipe and a pneumatic pipe through a three-way valve, the material injection pipe is communicated into a filter box, and the filter box is communicated with the air pressure pipe. Filtering is conducted through the filter disc rotationally arranged in the filter box, once the filter disc is blocked, the air pressure in the material injection pipe is increased, the air pressure enters the guide plate through the air pressure pipe, the filter disc is pushed to rotate, the part, not blocked, of the filter disc is rotated to the position under the material injection pipe, and filtering continues to be completed; the air pressure can push the separating needle to upwards eject the blocked impurities in the filter holes of the filter disc at the blocked part, and finally, the flushing liquid in the liquid supply machine can flush the impurities ejected from the filter disc through the air pressure, so that the switching and cleaning operations of the filter disc are automatically completed, frequent shutdown treatment is not needed, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of PP melt-blown production equipment, in particular to an extrusion device for PP melt-blown pellets. Background Art

[0002] PP melt-blown production is a material for the middle layer of masks. The melt-blown process is a type of polymer extrusion non-woven process. High-speed hot air is used to draw the polymer melt fine stream extruded from the die spinneret hole to form ultra-fine fibers and condense on the web-forming machine. Due to its excellent mechanical properties, physical properties and environmental performance, it is widely used in mask production and has a wide range of applications. PP melt-blown production is based on PP granular materials and is a melt-blown cloth made through extrusion, mold spraying, molding cooling, and winding processes; At present, PP melt-blown pellets are contaminated during storage and transportation, with impurities mixed in them, and metal debris and dust agglomerates caused by equipment wear during the production process. In order to process the extruded materials, the raw materials are usually cleaned or filtered during the extrusion process. However, since the filter screen or filter element is easily clogged, frequent shutdowns are required for processing, affecting production efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide an extrusion device for PP melt-blown pellets, aiming to solve the problem that the filter screen or filter element of the existing PP melt-blown pellet extrusion device is easily blocked, and frequent shutdown processing affects production efficiency.

[0004] The present invention is implemented as follows: an extrusion device for PP melt-blown pellets comprises a production platform, an extruder is arranged on the top of the production platform, an extrusion die, a web forming machine, a winding and slitting machine, a liquid supply machine and a cooling machine are respectively arranged on the bottom of the production platform, a circular filter box is installed at the discharge end of the extruder through the main channel of the three-way valve, and a guide plate is also arranged below the filter box; The internal bearing of the filter box is connected to a switching shaft, a filter disc is rotatably mounted on the outside of the switching shaft, and a cleaning assembly is also installed inside the filter box, the cleaning assembly includes a lifting and lowering mandrel, and a plurality of separation needles corresponding to the filter holes of the filter disc are arranged at the end of the mandrel; The secondary channel of the three-way valve is connected with an air pressure tube separated by a ceramic membrane, and a telescopic rod is installed at the end of the air pressure tube. The three-way valve drives the telescopic rod to extend and retract through the change of internal pressure, and adjusts the rotation of the filter disc and the lifting operation of the separation needle, which are respectively used to switch the filter disc and clean the blockage in the filter hole of the filter disc.

[0005] Preferably, the three-way valve is connected to the top of the filter box through an injection pipe, a collecting hopper is provided below the filter plate at a corresponding position of the injection pipe, and a discharge pipe is connected to the bottom of the collecting hopper, which is connected to the feed end of the extrusion die through the discharge pipe.

[0006] Preferably, the end of the air pressure tube extends to the inner side of the end of the guide plate, and a piston is provided at one end of the telescopic rod located inside the air pressure tube, a diaphragm is glued to the surface of the piston, and the outer surface of the piston is in contact with the inner wall of the air pressure tube.

[0007] Preferably, a second connecting rod arranged vertically upward is provided at one end of the telescopic rod located outside the air pressure tube, an end of the second connecting rod is connected to a lever via a rotating shaft, and a ratchet is provided at one end of the switching shaft located outside the bottom of the filter box; A first spring is disposed at one side of the end of the second connecting rod, and one end of the first spring contacts one side of the shifting rod to push the end of the shifting rod to contact the surface of the ratchet wheel.

[0008] Preferably, one end of the telescopic rod located outside the air pressure tube is also connected to a first connecting rod arranged parallel to the telescopic rod, and an end of the first connecting rod is provided with a top block arranged perpendicular to the first connecting rod; The top of the top block is provided with a chamfer, and a roller is also installed at the chamfered end of the top block.

[0009] Preferably, the end of the push rod passes through and extends to the outside of the bottom of the cleaning assembly, and a wedge block is provided on one side of the push rod close to the top block, and a second spring is installed between the top of the wedge block and the bottom of the cleaning assembly.

[0010] Preferably, the liquid outlet and liquid inlet of the liquid supply machine are respectively connected to a liquid supply pipe and a slag discharge pipe, and the end of the liquid supply pipe is connected to supply liquid to the cleaning component through an electromagnetic switch valve; The cleaning assembly is provided with a waste liquid bucket at the bottom of the mandrel, and the end of the slag discharge pipe is connected to the bottom of the waste liquid bucket.

[0011] Preferably, contacts are provided between the end of the telescopic rod and the inner wall of the end of the guide plate, and the contacts are used to switch the electromagnetic switch valve.

[0012] The invention discloses an extrusion device for PP melt-blown pellets, which has the following beneficial effects: the application connects an injection pipe and an air pressure pipe respectively through a three-way valve at the discharge end of the extruder, passes the injection pipe into the filter box, and performs filtering through a filter disc rotatably arranged in the filter box; once the filter disc is blocked, the air pressure inside the injection pipe increases, and the air pressure enters the guide plate through the air pressure pipe, pushing the filter disc to rotate, rotating the unblocked portion of the filter disc to just below the injection pipe, continuing to complete the filtering, and the air pressure pushes the separation needle to push upward the blocked impurities in the filter holes of the blocked portion of the filter disc; finally, the air pressure causes the contact point at the end of the telescopic rod to collide with the contact point on the inner wall of the guide plate, and starts the electromagnetic switch valve, so that the flushing liquid in the liquid supply machine flushes the impurities pushed out from the filter disc, and automatically completes the switching and cleaning operations of the filter disc, without the need for frequent shutdowns, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of an extrusion device for PP melt-blown pellets provided in an embodiment of the present invention; Figure 2 It is a partial structural schematic diagram of a PP melt-blown pellet extrusion device provided in an embodiment of the present invention; Figure 3 It is a schematic diagram of the internal structure of a filter box of an extrusion device for PP melt-blown pellets provided in an embodiment of the present invention; Figure 4 The present invention provides a PP melt-blown pellet extrusion device. Figure 3 A local enlarged structural diagram of the part; Figure 5 This is a bottom-up structural schematic diagram of a filter box of an extrusion device for PP melt-blown pellets provided in an embodiment of the present invention; Figure 6 The present invention provides a PP melt-blown pellet extrusion device. Figure 5 A schematic diagram of the local enlarged structure at B in FIG. Figure 7 It is a schematic diagram of the cross-sectional structure of an air pressure tube end portion of an extrusion device for PP melt-blown pellets provided in an embodiment of the present invention.

[0014] Marking Description: 1. Production platform; 2. Extruder; 3. Filter box; 4. Extrusion die; 5. Web forming machine; 6. Winding and slitting machine; 7. Liquid supply machine; 8. Cooling machine; 71. Liquid supply pipe; 72. Slag discharge pipe; 31. Switching shaft; 32. Filter plate; 33. Cleaning assembly; 34. Three-way valve; 35. Collecting hopper; 36. Guide plate; 37. Push rod; 38. Waste liquid hopper; 311, ratchet; 331, solenoid switch valve; 341, injection pipe; 342, air pressure pipe; 343, telescopic rod; 344, first connecting rod; 345, top block; 346, second connecting rod; 347, lever; 348, first spring; 3431, piston; 3432, diaphragm; 351, discharge pipe; 361, contact point; 371. Separation needle; 372. Wedge block; 373. Second spring. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0017] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0018] In this embodiment: Reference Figure 1-2 As shown, a preferred embodiment of the present invention is provided.

[0019] The extrusion device of the PP melt-blown pellets of this embodiment includes a production platform 1, an extruder 2 is arranged on the top of the production platform 1, and an extrusion die 4, a web forming machine 5, a winding and slitting machine 6, a liquid supply machine 7 and a cooler 8 are respectively arranged at the bottom of the production platform 1. A circular filter box 3 is installed at the discharge end of the extruder 2 through the main channel of the three-way valve 34, and a guide plate 36 is also arranged below the filter box 3; The PP melt-blown pellets extruded by the extruder 2 are filtered through the filter box 3 and then injected into the extrusion die 4, and then made into a sprayed fleece cloth through the web forming machine 5, and finally cut by the winding and slitting machine 6. In this process, the required cooling liquid and cleaning liquid are supplied to each component through the liquid supply machine 7, and the waste liquid can be recovered for filtration and reuse; The internal bearing of the filter box 3 is connected to a switching shaft 31, and a filter disc 32 is rotatably installed on the outside of the switching shaft 31. The filter disc 32 can be rotated inside the filter box 3 by rotating the switching shaft 31, thereby switching the filtering position on the filter disc 32 to avoid the situation where the filtering part of the filter disc 32 is blocked and causes poor filtering effect. A cleaning component 33 is also installed inside the filter box 3, and the cleaning component 33 includes a lifting and movable top rod 37, and the end of the top rod 37 is provided with a plurality of separation needles 371 corresponding to the filter holes of the filter disc 32, and the separation needles 371 set by lifting and lowering are used to realize the cleaning operation of the blocked filter holes on the filter disc 32; The auxiliary channel of the three-way valve 34 is connected to a pneumatic tube 342 through a ceramic membrane, and a telescopic rod 343 is installed at the end of the pneumatic tube 342. The three-way valve 34 drives the telescopic rod 343 to extend and retract through the change of internal pressure, thereby adjusting the rotation of the filter disc 32 and the lifting operation of the separation needle 371, which are respectively used to switch the filter disc 32 and clean the blockage in the filter hole of the filter disc 32; For further information, see Attachment Figure 3-4 As shown, the three-way valve 34 is connected to the top of the filter box 3 through the injection pipe 341, and the filter disc 32 is provided with a collecting hopper 35 below the corresponding position of the injection pipe 341. The bottom of the collecting hopper 35 is connected to a discharge pipe 351, which is connected to the feed end of the extrusion die 4 through the discharge pipe 351. The extruder 2 injects the extruded material into the filter box 3 through the injection pipe 341 through the three-way valve 34 for filtration and then sends it into the extrusion die 4 through the discharge pipe 351 for pressurized extrusion operation; It is worth noting that the end of the air pressure tube 342 on the auxiliary channel of the three-way valve 34 extends to the inner side of the end of the guide plate 36, and the telescopic rod 343 is located at one end of the air pressure tube 342 and is provided with a piston 3431. The surface of the piston 3431 is glued with a diaphragm 3432, which can only pass gas and filter steam, and the outer surface of the piston 3431 is in conflict with the inner wall of the air pressure tube 342. When the filtering part of the filter disc 32 is blocked, the pressure in the injection tube 341 will rise during the continuous extrusion of the extruder 2. At this time, the pressure in the air pressure tube 342 increases, which will push the telescopic rod 343 at the end of the piston 3431 to push out of the guide plate 36, thereby pushing the switching shaft 31 to rotate a certain angle, driving the separation needle 371 to lift upward, and at the same time, the impurities on the filter disc 32 can be washed off by the liquid supply machine 7; In order to realize the above-mentioned switching shaft 31 driving the filter disc 32 to rotate, refer to the attached Figure 5-6As shown, the telescopic rod 343 is provided with a second connecting rod 346 arranged vertically upward at one end outside the air pressure tube 342, and the end of the second connecting rod 346 is connected to a lever 347 through a rotating shaft, and the switching shaft 31 is provided with a ratchet 311 at one end outside the bottom of the filter box 3, and a first spring 348 is provided on one side of the end of the second connecting rod 346, and one end of the first spring 348 is in contact with one side of the lever 347, which is used to push the end of the lever 347 to contact the surface of the ratchet 311. When the telescopic rod 343 moves outside the air pressure tube 342, it will be pushed outward a certain distance through the lever 347 at the end of the second connecting rod 346, and then the switching shaft 31 on the ratchet 311 is driven to rotate.

[0020] In order to realize the lifting operation of the separation needle 371, Figure 7 In the embodiment, the telescopic rod 343 is located at one end outside the air pressure tube 342 and is also connected to a first connecting rod 344 arranged parallel to the telescopic rod 343. The end of the first connecting rod 344 is provided with a top block 345 arranged perpendicular to the first connecting rod 344. When the telescopic rod 343 moves out of the air pressure tube 342, the second connecting rod 346 will drive the top block 345 to move in the direction of the top rod 37. The top of the top block 345 is provided with a chamfer, and the chamfered end of the top block 345 is also equipped with a roller. The end of the top rod 37 It penetrates and extends to the outside of the bottom of the cleaning component 33, and a wedge block 372 is provided on the side of the push rod 37 close to the top block 345. A second spring 373 is also installed between the top of the wedge block 372 and the bottom of the cleaning component 33. The roller of the top block 345 will lift the separation needle 371 on the push rod 37 upward through the wedge block 372. When the telescopic rod 343 moves into the air pressure tube 342, under the action of the second spring 373, the separation needle 371 is reset and detached from the filter hole on the filter disc 32.

[0021] The liquid outlet and liquid inlet of the liquid supply machine 7 are respectively connected with a liquid supply pipe 71 and a slag discharge pipe 72. The end of the liquid supply pipe 71 is used to supply liquid to the cleaning component 33 through an electromagnetic switch valve 331. Contacts 361 are provided between the end of the telescopic rod 343 and the inner wall of the end of the guide plate 36. The contact 361 is used to switch the electromagnetic switch valve 331. When the contact 361 at the end of the telescopic rod 343 conflicts with the contact 361 on the inner wall of the guide plate 36, the electromagnetic switch valve 331 is activated to allow the flushing liquid in the liquid supply machine 7 to flush the impurities ejected from the filter disc 32. The cleaning component 33 is provided with a waste liquid bucket 38 at the bottom of the push rod 37. The end of the slag discharge pipe 72 is connected to the bottom of the waste liquid bucket 38. The waste liquid can fall into the waste liquid bucket 38 from the through hole at the push rod 37 and is sent to the liquid supply machine 7 through the slag discharge pipe 72 for purification and reuse. In the present application, at the discharge end of the extruder 2, the injection pipe 341 and the air pressure pipe 342 are respectively connected through the three-way valve 34, and the injection pipe 341 is passed into the filter box 3, and the filter is filtered through the filter disc 32 rotatably set in the filter box 3. Once the filter disc 32 is blocked, the air pressure inside the injection pipe 341 increases, and the air pressure enters the guide plate 36 through the air pressure pipe 342, pushing the filter disc 32 to rotate, and the unblocked part of the filter disc 32 is rotated to the bottom of the injection pipe 341 to continue filtering. The air pressure will push the separation needle 371 to push the blocked impurities in the filter holes of the blocked part of the filter disc 32 upward. Finally, the air pressure will also cause the contact 361 at the end of the telescopic rod 343 to conflict with the contact 361 on the inner wall of the guide plate 36, and start the electromagnetic switch valve 331, so that the flushing liquid in the liquid supply machine 7 flushes the impurities pushed out from the filter disc 32, and automatically completes the switching and cleaning operations of the filter disc 32, without the need for frequent shutdown processing, thereby improving production efficiency.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PP melt-blown pellet extrusion device, comprising a production platform, wherein an extruder is arranged on the top of the production platform, and an extrusion die, a web forming machine, a winding and slitting machine, a liquid supply machine and a cooling machine are arranged on the bottom of the production platform, characterized in that: A circular filter box is installed at the discharge end of the extruder through the main channel of the three-way valve, and a guide plate is also arranged below the filter box; The internal bearing of the filter box is connected to a switching shaft, a filter disc is rotatably mounted on the outside of the switching shaft, and a cleaning assembly is also installed inside the filter box, the cleaning assembly includes a lifting and lowering mandrel, and a plurality of separation needles corresponding to the filter holes of the filter disc are arranged at the end of the mandrel; The secondary channel of the three-way valve is connected with an air pressure tube separated by a ceramic membrane, and a telescopic rod is installed at the end of the air pressure tube. The three-way valve drives the telescopic rod to extend and retract through the change of internal pressure, and adjusts the rotation of the filter disc and the lifting operation of the separation needle, which are respectively used to switch the filter disc and clean the blockage in the filter hole of the filter disc.

2. A PP melt-blown pellet extrusion device as claimed in claim 1, characterized in that: The three-way valve is connected to the top of the filter box through an injection pipe, and a collecting hopper is provided below the filter disc corresponding to the injection pipe. The bottom of the collecting hopper is connected to a discharge pipe, which is connected to the feed end of the extrusion die through the discharge pipe.

3. A PP melt-blown pellet extrusion device as claimed in claim 1, characterized in that: The end of the air pressure tube extends to the inner side of the end of the guide plate, and a piston is arranged at one end of the telescopic rod located inside the air pressure tube. A diaphragm is glued to the surface of the piston, and the outer surface of the piston contacts the inner wall of the air pressure tube.

4. A PP melt-blown pellet extrusion device as claimed in claim 1, characterized in that: The telescopic rod is provided with a second connecting rod arranged vertically upward at one end outside the air pressure tube, the end of the second connecting rod is connected to a shifting rod via a rotating shaft, and the switching shaft is provided with a ratchet at one end outside the bottom of the filter box; A first spring is disposed at one side of the end of the second connecting rod, and one end of the first spring contacts one side of the shifting rod to push the end of the shifting rod to contact the surface of the ratchet wheel.

5. A PP melt-blown pellet extrusion device as claimed in claim 1, characterized in that: The telescopic rod is also connected to a first connecting rod arranged parallel to the telescopic rod at one end outside the air pressure tube, and a top block arranged perpendicular to the first connecting rod is arranged at the end of the first connecting rod; The top of the top block is provided with a chamfer, and a roller is also installed at the chamfered end of the top block.

6. A PP melt-blown pellet extrusion device as claimed in claim 5, characterized in that: The end of the push rod passes through and extends to the outside of the bottom of the cleaning assembly, and a wedge block is arranged on one side of the push rod close to the top block, and a second spring is installed between the top of the wedge block and the bottom of the cleaning assembly.

7. The extrusion device for PP melt-blown pellets according to claim 1, characterized in that: The liquid outlet and liquid inlet of the liquid supply machine are respectively connected to a liquid supply pipe and a slag discharge pipe, and the end of the liquid supply pipe is used to supply liquid to the cleaning component through an electromagnetic switch valve; The cleaning assembly is provided with a waste liquid bucket at the bottom of the mandrel, and the end of the slag discharge pipe is connected to the bottom of the waste liquid bucket.

8. A PP melt-blown pellet extrusion device as claimed in claim 7, characterized in that: Contacts are arranged between the end of the telescopic rod and the inner wall of the end of the guide plate, and the contacts are used to switch the electromagnetic switch valve.

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