Cold-resistant high polymer blending device and method for thin-film capacitor

Abstract

The invention discloses a thin-film capacitor cold-resistant high polymer blending device and method, and belongs to the technical field of blending equipment. A thin-film capacitor cold-resistant high polymer blending device comprises a supporting seat and further comprises an installation frame, a material storage assembly and a material storage assembly, the mixing tank comprises an outer cylinder and an inner cylinder, the inner cylinder is fixedly mounted in the outer cylinder, and the outer cylinder is rotatably mounted on the supporting seat; the lifting feeding assembly is arranged on the mounting frame in a lifting mode, and the input end of the lifting feeding assembly is connected with the output end of the storage assembly; the mixing tank rotates, the rotating axis is perpendicular to the stirring axis of the stirring assembly, and materials are not only stirred by the stirring assembly but also subjected to centrifugal force and shearing force generated by rotation of the mixing tank in the mixing process, so that more sufficient mixing is realized, and the mixing efficiency is improved; and uniform mixing of polypropylene and polyethylene raw materials is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of blending equipment, in particular to a cold-resistant polymer blending device for film capacitors. Background Art

[0002] The cold-resistant modification of polypropylene (PP) is mainly achieved through the method of blending modification. Specific schemes include blending with polyethylene (PE), toughening with polyolefin (POE), and toughening with ethylene propylene diene monomer rubber (EPDM).

[0003] The existing mixing method is to place multiple materials into a stirring tank and use a motor to drive a stirring shaft to mix and stir the multiple materials. However, when a large number of multiple materials are placed at one time, the multiple materials will be stratified in the stirring tank according to the order of placement. It is difficult to mix the vertically stacked materials evenly by simply relying on the stirring shaft, and the material blending effect is poor. For this reason, a cold-resistant polymer blending device for film capacitors is proposed. Summary of the invention

[0004] The present invention is to solve the problem in the prior art that when a large number of multiple materials are implanted at one time, the multiple materials will be layered in a stirring tank according to the order of implantation, and a cold-resistant polymer blending device for film capacitors is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A cold-resistant polymer blending device for film capacitors comprises a support base, and also comprises: a mounting frame, on which a material storage component is fixedly mounted; a mixing tank, comprising an outer cylinder and an inner cylinder, wherein the inner cylinder is fixedly mounted in the outer cylinder, and the outer cylinder is rotatably mounted on the support base; a lifting and feeding component, which is lifted and arranged on the mounting frame, and the input end of the lifting and feeding component is connected to the output end of the material storage component; a feeding pipe is fixedly mounted on the inner cylinder, and a first control valve is fixedly mounted on the feeding pipe; when material addition is required, the feeding pipe is vertically upward, and the output end of the lifting and feeding component descends and is inserted into the feeding pipe, and when mixing begins, the output end of the lifting and feeding component rises and detaches from the feeding pipe; a driving component is arranged on the support base, and the output end of the driving component is connected to the mixing tank; a stirring component is arranged in the inner cylinder.

[0007] As a preferred embodiment of the present invention: the driving assembly includes a connecting seat fixedly installed in the supporting seat, a reduction motor is fixedly installed on the connecting seat, a mounting tube is fixedly installed on the outer cylinder, and the mounting tube is connected to the output shaft of the reduction motor through a gear set.

[0008] As a preferred embodiment of the present invention: a cavity is provided between the outer cylinder and the inner cylinder, the installation tube is communicated with the cavity, and an electromagnetic heater is fixedly installed in the cavity.

[0009] As a preferred embodiment of the present invention: the stirring assembly includes a stirring motor, the stirring motor is fixedly mounted on the outer cylinder, and the stirring motor is arranged at one end of the outer cylinder away from the feeding pipe, a spline shaft is rotatably mounted in the inner cylinder, the spline shaft is fixedly connected to the output shaft of the stirring motor, a mounting plate is slidably mounted on the spline shaft, and a stirring rod is fixedly mounted on the mounting plate.

[0010] As a preferred embodiment of the present invention: a piston plate is rotatably mounted on the mounting plate, the mounting plate and the piston plate are rotatably sealed, the piston plate is slidably mounted in the inner cylinder, the piston plate and the mounting plate divide the inner cylinder into a mounting chamber and a mixing chamber, a counterweight block is fixedly mounted on the piston plate, and the counterweight block is arranged in the mounting chamber; an overflow valve is fixedly mounted on the mounting plate and the mixing tank, when the mounting plate moves toward the direction of the feed pipe, external gas enters the mounting chamber through the overflow valve, and when the piston plate and the mounting plate move toward the direction of the counterweight block, the gas in the mounting chamber enters the mixing chamber.

[0011] As a preferred embodiment of the present invention: a mounting head is fixedly mounted on the spline shaft, and the mounting head extends into the feed pipe and a spiral blade is fixedly mounted therein.

[0012] As a preferred embodiment of the present invention: a stirring blade is fixedly mounted on the mounting head, and during the blending process, the spline shaft drives the stirring blade to rotate, and the stirring blade drives the raw materials to move toward the middle part of the inner cylinder.

[0013] As a preferred embodiment of the present invention: the material storage assembly includes a weighing tank fixedly mounted on a mounting frame, a suction pump is fixedly mounted on the top of the weighing tank, the output end of the suction pump is connected to the feed end of the weighing tank, a discharge pipe is fixedly mounted on the bottom of the weighing tank, a second control valve is fixedly mounted on the discharge pipe, and a hose is fixedly mounted on the bottom of the discharge pipe.

[0014] As a preferred embodiment of the present invention: the lifting and feeding assembly includes a lifting motor fixedly mounted on the mounting frame, a screw rod fixedly mounted on the output end of the lifting motor, a connecting cylinder threadedly connected to the screw rod, a limiting plate fixedly mounted on the bottom of the mounting frame, the connecting cylinder is slidably connected to the limiting plate, a feed pipe is fixedly mounted on the bottom of the connecting cylinder, and the feed end of the feed pipe is fixedly connected to a hose; an exhaust pipe is fixedly mounted on the feed pipe, a filter rod is fixedly mounted in the exhaust pipe, and a docking joint is fixedly mounted on the input end of the exhaust pipe; an air intake pipe is fixedly mounted on the bottom of the feed pipe, and when the air intake pipe descends, the air intake pipe is inserted into the exhaust pipe.

[0015] A blending method for cold-resistant polymers of film capacitors comprises the following steps:

[0016] Step 1: Align the feed pipe with the lifting and discharging assembly, and then drive the lifting and discharging assembly down to dock with the feed pipe and dock the air intake pipe with the exhaust pipe;

[0017] Step 2: Open the first control valve and the second control valve to add material into the inner tube;

[0018] Step 3: During the process of adding materials, the stirring component rotates;

[0019] Step 4: During the process of adding materials, the weight of the raw materials and the counterweight block cooperate to drive the mounting plate and the piston plate to descend. During this process, the gas in the mounting chamber enters the mixing chamber and is discharged into the feed pipe through the exhaust pipe and the intake pipe under the pressure of the added raw materials;

[0020] Step 5: After the raw material is added, the first control valve and the second control valve are closed, and the lifting and feeding assembly is separated from the mixing tank;

[0021] Step 6: The stirring component stirs the material, and at the same time, the driving component drives the mixing tank to rotate, and the electromagnetic heater is powered on to heat the raw materials;

[0022] Step 7: The feed pipe is vertically downward, the first control valve is opened, and the counterweight drives the piston plate and the mounting plate to descend to discharge the blended materials out of the mixing tank.

[0023] Compared with the prior art, the present invention provides a cold-resistant polymer blending device for film capacitors, which has the following beneficial effects:

[0024] 1. The cold-resistant polymer blending device for film capacitors rotates the mixing tank, and the rotation axis is perpendicular to the stirring axis of the stirring assembly. During the mixing process, the materials are not only stirred by the stirring assembly, but also subjected to the centrifugal force and shear force generated by the rotation of the mixing tank, thereby achieving more complete mixing, improving the mixing efficiency, and ensuring uniform mixing of polypropylene and polyethylene raw materials;

[0025] 2. The cold-resistant polymer blending device for film capacitors can accurately control the input amount of raw materials by setting a weighing tank and a pump, thereby avoiding the problem of waste of raw materials and inaccurate proportions. At the same time, by controlling the switch of the first control valve and the second control valve, the timing and amount of raw material delivery can be accurately controlled, further improving the accuracy of mixing;

[0026] 3. The cold-resistant polymer blending device of the film capacitor is connected to the overflow valve on the mixing tank through the nitrogen bottle during the blending process. The nitrogen fully fills the gap between the polypropylene and the polyethylene, squeezes out the air between the gaps, and avoids air residue. This can prevent the air from causing oxidation during the subsequent hot-melt blending of the polypropylene and the polyethylene, thereby improving the blending quality. At the same time, during the discharge process, the nitrogen enters the installation cavity to absorb the residual heat in the inner cylinder to heat up, and when adding new materials, the heated nitrogen is evenly filled into the added materials to preheat the raw materials, shorten the subsequent hot-melt time, and improve the blending efficiency. In addition, during the addition process, as the pressure inside the mixing cavity increases, excess gas enters the feed pipe, causing gaps between the raw materials in the feed pipe, and the flowing gas causes the inside of the feed pipe to shake, which can prevent material accumulation from causing blockage and promote the smooth discharge of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of a cold-resistant polymer blending device for film capacitors proposed by the present invention;

[0028] Figure 2 This is a rear view of a cold-resistant polymer blending device for film capacitors proposed by the present invention;

[0029] Figure 3 This is a structural schematic diagram of a lifting and discharging assembly of a cold-resistant polymer blending device for film capacitors proposed by the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of a mixing tank of a cold-resistant polymer blending device for film capacitors proposed by the present invention;

[0031] Figure 5 A cross-sectional view of a mixing tank of a cold-resistant polymer blending device for film capacitors proposed by the present invention;

[0032] Figure 6 A cold-resistant polymer blending device for film capacitors proposed by the present invention Figure 5 The structural diagram of part A in the figure;

[0033] Figure 7 A schematic diagram of the structure of a stirring assembly for a cold-resistant polymer blending device for a film capacitor proposed by the present invention Figure 1 ;

[0034] Figure 8 A schematic diagram of the structure of a stirring assembly for a cold-resistant polymer blending device for a film capacitor proposed by the present invention Figure 2 ;

[0035] Fig. 9 The present invention provides a cross-sectional view of an exhaust pipe of a cold-resistant polymer blending device for a film capacitor.

[0036] In the figure: 1. support seat; 2. outer cylinder; 3. inner cylinder; 4. electromagnetic heater; 5. first control valve; 6. mounting pipe; 7. gear set; 8. connecting seat; 9. reduction motor; 10. mounting plate; 11. piston plate; 12. stirring rod; 13. counterweight; 14. stirring motor; 15. spline shaft; 16. mounting head; 17. stirring blade; 18. spiral blade; 19. exhaust pipe; 20. docking joint; 21. filter rod; 22. mounting frame; 23. weighing tank; 24. suction pump; 25. discharge pipe; 26. second control valve; 27. hose; 28. feed pipe; 29. ​​intake pipe; 30. lifting motor; 31. screw rod; 32. connecting cylinder; 33. limit plate; 34. feed pipe. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] Example: Refer to Figure 1-Figure 9A cold-resistant polymer blending device for film capacitors comprises a support base 1, and also comprises: a mounting frame 22, on which a material storage component is fixedly mounted; a mixing tank, comprising an outer tube 2 and an inner tube 3, wherein the outer tube 2 is a heat-insulating tube, the inner tube 3 is a heat-conducting tube, the inner tube 3 is fixedly mounted in the outer tube 2, and the outer tube 2 is rotatably mounted on the support base 1; a lifting and feeding component, which is lifted and arranged on the mounting frame 22, and the input end of the lifting and feeding component is connected to the output end of the material storage component; a feeding pipe 34 is fixedly mounted on the inner tube 3, and a first control valve 5 is fixedly mounted on the feeding pipe 34; when material addition is required, the feeding pipe 34 is vertically upward, and the output end of the lifting and feeding component descends and is inserted into the feeding pipe 34, and when mixing begins, the output end of the lifting and feeding component rises and separates from the feeding pipe 34; a driving component is arranged on the support base 1, and the output end of the driving component is connected to the mixing tank; a stirring component is arranged in the inner tube 3.

[0040] In this embodiment, two sets of material storage components and lifting and feeding components are used to quantitatively fill the mixing tank with polypropylene and polyethylene raw materials, and then the lifting and feeding casting is separated from the mixing tank, and then the mixing tank is driven to rotate by the driving component. During the rotation of the mixing tank, the stirring component stirs and mixes the polypropylene and polyethylene inside the inner cylinder 3, wherein the rotation axis of the mixing tank is perpendicular to the stirring axis of the stirring component.

[0041] In summary, by rotating the mixing tank with the rotation axis perpendicular to the stirring axis of the stirring assembly, the materials are not only stirred by the stirring assembly during the mixing process, but also subjected to the centrifugal force and shear force generated by the rotation of the mixing tank, thereby being mixed more fully.

[0042] Reference Figure 5 The driving assembly includes a connecting seat 8 fixedly installed in the supporting seat 1, a reduction motor 9 is fixedly installed on the connecting seat 8, a mounting tube 6 is fixedly installed on the outer cylinder 2, and the mounting tube 6 is connected to the output shaft of the reduction motor 9 through a gear set 7.

[0043] The reduction motor 9 is started, and the reduction motor 9 drives the mounting tube 6 to rotate through the gear set 7, and the mounting tube 6 drives the mixing tank to rotate. During this process, the materials inside the mixing tank are turned over, thereby avoiding the phenomenon of material stratification.

[0044] Reference Figure 5 A cavity is provided between the outer tube 2 and the inner tube 3, the mounting tube 6 is connected to the cavity, and an electromagnetic heater 4 is fixedly installed in the cavity.

[0045] After the polypropylene and the polyethylene are uniformly blended, the electromagnetic heater 4 can be started to heat the inner cylinder 3, thereby melting and mixing the polypropylene and the polyethylene.

[0046] Reference Figure 5 , Figure 7 and Figure 8The stirring assembly includes a stirring motor 14, which is fixedly mounted on the outer cylinder 2 and arranged at one end of the outer cylinder 2 away from the feed pipe 34. A spline shaft 15 is rotatably mounted in the inner cylinder 3, and the spline shaft 15 is fixedly connected to the output shaft of the stirring motor 14. A mounting plate 10 is slidably mounted on the spline shaft 15, and a stirring rod 12 is fixedly mounted on the mounting plate 10. A piston plate 11 is rotatably mounted on the mounting plate 10, and the mounting plate 10 and the piston plate 11 are rotatably sealed. The piston plate 1 1 is slidably mounted in the inner cylinder 3, the piston plate 11 and the mounting plate 10 divide the inner cylinder 3 into a mounting chamber and a mixing chamber, a counterweight 13 is fixedly mounted on the piston plate 11, and the counterweight 13 is arranged in the mounting chamber; an overflow valve is fixedly mounted on the mounting plate 10 and the mixing tank, when the mounting plate 10 moves toward the direction of the feed pipe 34, the external gas enters the mounting chamber through the overflow valve, when the piston plate 11 and the mounting plate 10 move toward the direction of the counterweight 13, the gas in the mounting chamber enters the mixing chamber.

[0047] The stirring motor 14 is started, the stirring motor 14 drives the spline shaft 15 to rotate, the spline shaft 15 drives the mounting plate 10 to rotate, and the mounting plate 10 drives the stirring rod 12 to rotate to stir and mix the polypropylene and the polyethylene.

[0048] When blending polypropylene and polyethylene, a nitrogen bottle can be connected to the overflow valve on the mixing tank.

[0049] In this embodiment, when the counterweight 13 is located below the piston plate 11, the weight of the counterweight 13 drives the piston plate 11 to descend. During this process, the space inside the installation chamber increases, and the space inside the mixing chamber decreases. During this process, the piston plate 11 and the mounting plate 10 cooperate to absorb the nitrogen inside the nitrogen bottle. When the counterweight 13 rotates to above the piston plate 11, the counterweight 13 drives the piston plate 11 and the mounting plate 10 to descend again. During this process, the space inside the mixing chamber increases, and the space inside the installation chamber decreases. The nitrogen in the installation chamber enters the mixing chamber through the overflow valve. During the blending process, the nitrogen fully fills the gap between the polypropylene and the polyethylene, squeezes out the air between the gaps between the polypropylene and the polyethylene, avoids air residue, and avoids the air causing oxidation of the polypropylene and the polyethylene during the subsequent hot melt blending of the polypropylene and the polyethylene, thereby improving the blending quality.

[0050] During the turning over of the mixing tank, the mounting plate 10 and the piston plate 11 slide back and forth under the action of the counterweight 13 , and the stirring rod 12 moves back and forth during the reciprocating sliding of the mounting plate 10 and the piston plate 11 , thereby increasing the stirring range of the stirring rod 12 .

[0051] Reference Figure 5-Figure 7A mounting head 16 is fixedly mounted on the spline shaft 15, and a spiral blade 18 is fixedly mounted on the mounting head 16 extending into the feed pipe 34. A stirring blade 17 is fixedly mounted on the mounting head 16. During the blending process, the spline shaft 15 drives the stirring blade 17 to rotate, and the stirring blade 17 drives the raw material to move toward the middle part of the inner tube 3.

[0052] During blending, the spline shaft 15 rotates, driving the mounting head 16 and the spiral blade 18 to rotate. The spiral blade 18 rotates to drive the polypropylene and polyethylene coming out of the feed pipe 34 to move to the middle of the inner tube 3 to prevent the polypropylene and polyethylene from accumulating in the feed pipe 34. At the same time, the spline shaft 15 drives the stirring blade 17 to rotate, further promoting the mixing of the polypropylene and polyethylene materials.

[0053] When discharging is required, the spline shaft 15 is driven to rotate in the opposite direction (opposite to the direction in which the spline shaft 15 rotates during blending). The rotation speed of the spline shaft 15 is controlled to control the rotation speed of the spiral blade 18, and the spiral blade 18 is used to control the uniform discharge of the blended polypropylene and polyethylene mixed melt.

[0054] During discharge, the mouth of the feed pipe 34 is perpendicular to the ground. During this process, the counterweight 13 drives the piston plate 11 and the mounting plate 10 to descend. At the same time, the stirring motor 14 drives the spline shaft 15 to rotate, so that the stirring rod 12 rotates and descends at the same time. The piston plate 11 descends to scrape the inner wall of the inner cylinder 3. When the stirring rod 12 contacts the inner wall of the cone head of the inner cylinder 3, the rotating stirring rod 12 scrapes the inner wall of the cone head of the inner cylinder 3 to prevent the mixed melt from adhering to the inner wall of the inner cylinder 3.

[0055] Reference Figure 1-Figure 3 The material storage component includes a weighing tank 23 fixedly mounted on a mounting frame 22 (the weighing tank 23 is a storage tank with a weighing function), a suction pump 24 is fixedly mounted on the top of the weighing tank 23 (in addition, the suction pump 24 can also be mounted on the mounting frame 22), the output end of the suction pump 24 is connected to the feed end of the weighing tank 23, a discharge pipe 25 is fixedly mounted on the bottom of the weighing tank 23, a second control valve 26 is fixedly mounted on the discharge pipe 25, and a hose 27 is fixedly mounted on the bottom of the discharge pipe 25.

[0056] In this embodiment, polypropylene and polyethylene raw materials are extracted by two sets of extraction pumps 24 and transmitted to two sets of weighing tanks 23 respectively. When the weighing tanks 23 detect that the weight of the raw materials reaches a threshold, the extraction pumps 24 stop working.

[0057] Reference Figure 1-Figure 6 and Fig. 9The lifting and feeding assembly includes a lifting motor 30 fixedly mounted on a mounting frame 22, a screw rod 31 fixedly mounted on the output end of the lifting motor 30, a connecting tube 32 threadedly connected to the screw rod 31, a limiting plate 33 fixedly mounted on the bottom of the mounting frame 22, the connecting tube 32 is slidably connected to the limiting plate 33, a feed pipe 28 fixedly mounted on the bottom of the connecting tube 32, and the feed end of the feed pipe 28 is fixedly connected to the hose 27; an exhaust pipe 19 fixedly mounted on the feed pipe 34, a filter rod 21 fixedly mounted in the exhaust pipe 19, and a docking joint 20 fixedly mounted on the input end of the exhaust pipe 19; an air intake pipe 29 fixedly mounted on the bottom of the feed pipe 28, when the air intake pipe 29 descends, the air intake pipe 29 is inserted into the exhaust pipe 19.

[0058] When feeding, the feed pipe 34 is made to point vertically upward, and then the lifting motor 30 is started. The lifting motor 30 drives the screw rod 31 to rotate, and the screw rod 31 cooperates with the limit plate 33, and the connecting tube 32 descends, thereby driving the conveying pipe 28 to descend. The conveying pipe 28 descends and docks with the feed pipe 34. At the same time, the air inlet pipe 29 docks with the docking head 20. After docking, the first control valve 5 and the second control valve 26 are opened to discharge the material into the inner tube 3. During the discharge process, under the weight of the newly added polypropylene and polyethylene materials and the counterweight block 13, the piston plate 11 and the mounting plate 10 descend, and the nitrogen inside the mounting chamber enters the mixing chamber.

[0059] Under the heat preservation effect of the outer tube 2, there is residual heat in the inner tube 3 after the material is discharged. During the discharge process, the nitrogen that enters the installation cavity absorbs the heat in the inner tube 3 to increase the temperature.

[0060] During the process of adding materials again, the heated nitrogen enters the mixing chamber to fill the gap between the polypropylene and the polyethylene, and while discharging the air between the polypropylene and the polyethylene, the heat in the heated nitrogen is evenly dispersed into the polypropylene and polyethylene raw materials, and the two materials are preheated. As the pressure inside the mixing chamber increases, the air and excess nitrogen inside the mixing chamber are filtered by the filter rod 21 and discharged into the air inlet pipe 29, and then enter the delivery pipe 28 through the air inlet pipe 29, so that air gaps are generated between the polypropylene and the polyethylene in the delivery pipe 28, thereby preventing the polypropylene or the polyethylene from being blocked due to material accumulation during the discharge process, thereby promoting the discharge of materials into the inner cylinder 3.

[0061] Among them, the filter rod 21 is a zeolite molecular sieve rod or an activated carbon rod, which adsorbs impurities in the exhausted gas through micropores to prevent environmental pollution, and the micropores of the zeolite molecular sieve rod and the activated carbon rod can prevent the mixed melt of polypropylene and polyethylene from being discharged through the exhaust pipe 19.

[0062] A blending method for cold-resistant polymers of film capacitors comprises the following steps:

[0063] Step 1: Align the feed pipe 34 with the lifting and discharging assembly, then drive the lifting and discharging assembly down to dock with the feed pipe 34 and dock the air intake pipe 29 with the exhaust pipe 19;

[0064] Step 2: Open the first control valve 5 and the second control valve 26 to add material into the inner tube 3;

[0065] Step 3: During the process of adding materials, the stirring component rotates;

[0066] Step 4: During the process of adding materials, the weight of the raw materials and the counterweight block 13 cooperate to drive the mounting plate 10 and the piston plate 11 to descend. During this process, the gas in the mounting chamber enters the mixing chamber and is discharged into the feed pipe 28 through the exhaust pipe 19 and the intake pipe 29 under the pressure of the added raw materials;

[0067] Step 5: After the raw material addition is completed, the first control valve 5 and the second control valve 26 are closed, and the lifting and feeding assembly is separated from the mixing tank;

[0068] Step 6: The stirring component stirs the material, and at the same time, the driving component drives the mixing tank to rotate, and the electromagnetic heater 4 is powered on to heat the raw material;

[0069] Step 7: The feed pipe 34 is moved vertically downward, the first control valve 5 is opened, and the counterweight block 13 drives the piston plate 11 and the mounting plate 10 to descend to discharge the blended materials out of the mixing tank.

[0070] To sum up, in this scheme, the low-temperature brittle temperature of polyethylene can reach -70 degrees. By adding an appropriate amount of polyethylene to polypropylene, the low-temperature resistance of polypropylene can be changed. By blending polypropylene and polyethylene through the above-mentioned film capacitor cold-resistant polymer blending device, quantitative mixing of polyethylene and polypropylene can be achieved, avoiding affecting the hardness of the polypropylene product and avoiding stratification of the polypropylene after blending.

[0071] In order to facilitate the verification of the use of the film capacitors finally produced by the above-mentioned blending device and process in a low-temperature environment, the finally manufactured capacitors are moved to a low-temperature environment for power-on operation; the adjustment of the capacitor low-temperature detection operation is: the temperature is -40°C, and the power-on operation time is 24 hours, and the voltage level the capacitor withstands is 1.3Un; after the test operation, the shell, epoxy resin, and insulating film are checked for cracks; at the same time, the copper bus, nuts and other metal parts are checked for ablation; the change in the capacitance of the capacitor is checked, and the capacitance change rate is ≤2%, and it is considered unqualified if it exceeds 2%; the loss tangent value is checked to see if it is ≤l.ltanδ+0.0001; the equivalent series resistor ESR: 10kHz; △ESR / ESR0≤50%.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cold-resistant polymer blending device for film capacitors, comprising a support seat (1), characterized in that: Also includes: A mounting frame (22), on which a material storage assembly is fixedly mounted; A mixing tank, comprising an outer cylinder (2) and an inner cylinder (3), wherein the inner cylinder (3) is fixedly mounted in the outer cylinder (2), and the outer cylinder (2) is rotatably mounted on the support seat (1); A lifting feeding component is lifted and arranged on a mounting frame (22), and an input end of the lifting feeding component is connected to an output end of the material storage component; A feed pipe (34) is fixedly mounted on the inner cylinder (3), and a first control valve (5) is fixedly mounted on the feed pipe (34); When adding materials is required, the feed pipe (34) is vertically upward, and the output end of the lifting and feeding assembly is lowered and inserted into the feed pipe (34); when mixing begins, the output end of the lifting and feeding assembly rises and leaves the feed pipe (34); A driving assembly is arranged on the support seat (1), and an output end of the driving assembly is connected to the mixing tank; A stirring assembly is arranged in the inner cylinder (3).

2. A cold-resistant polymer blending device for film capacitors according to claim 1, characterized in that: The driving assembly comprises a connecting seat (8) fixedly mounted in the supporting seat (1), a reduction motor (9) fixedly mounted on the connecting seat (8), a mounting tube (6) fixedly mounted on the outer cylinder (2), and the mounting tube (6) is transmission-connected to an output shaft of the reduction motor (9) via a gear set (7).

3. A cold-resistant polymer blending device for film capacitors according to claim 2, characterized in that: A cavity is provided between the outer cylinder (2) and the inner cylinder (3), the mounting tube (6) is in communication with the cavity, and an electromagnetic heater (4) is fixedly mounted in the cavity.

4. The cold-resistant polymer blending device for film capacitors according to claim 1, characterized in that: The stirring assembly comprises a stirring motor (14), the stirring motor (14) is fixedly mounted on the outer cylinder (2), and the stirring motor (14) is arranged at one end of the outer cylinder (2) away from the feeding pipe (34), a spline shaft (15) is rotatably mounted in the inner cylinder (3), the spline shaft (15) is fixedly connected to the output shaft of the stirring motor (14), a mounting plate (10) is slidably mounted on the spline shaft (15), and a stirring rod (12) is fixedly mounted on the mounting plate (10).

5. A cold-resistant polymer blending device for film capacitors according to claim 4, characterized in that: A piston plate (11) is rotatably mounted on the mounting plate (10), the mounting plate (10) and the piston plate (11) are rotatably sealed, the piston plate (11) is slidably mounted in the inner cylinder (3), the piston plate (11) and the mounting plate (10) divide the inner cylinder (3) into a mounting chamber and a mixing chamber, a counterweight (13) is fixedly mounted on the piston plate (11), and the counterweight (13) is arranged in the mounting chamber; The mounting plate (10) and the mixing tank are both fixedly mounted with overflow valves. When the mounting plate (10) moves in the direction of the feed pipe (34), external gas enters the mounting chamber through the overflow valve. When the piston plate (11) and the mounting plate (10) move in the direction of the counterweight block (13), the gas in the mounting chamber enters the mixing chamber.

6. The cold-resistant polymer blending device for film capacitors according to claim 4, characterized in that: A mounting head (16) is fixedly mounted on the spline shaft (15), and the mounting head (16) extends into the feed pipe (34) and is fixedly mounted with a spiral blade (18).

7. A cold-resistant polymer blending device for film capacitors according to claim 6, characterized in that: A stirring blade (17) is fixedly mounted on the mounting head (16). During the blending process, the spline shaft (15) drives the stirring blade (17) to rotate, and the stirring blade (17) drives the raw materials to move toward the middle part of the inner cylinder (3).

8. The cold-resistant polymer blending device for film capacitors according to claim 5, characterized in that: The material storage assembly comprises a weighing material tank (23) fixedly mounted on a mounting frame (22); a material extraction pump (24) is fixedly mounted on the top of the weighing material tank (23); an output end of the material extraction pump (24) is connected to a feed end of the weighing material tank (23); a discharge pipe (25) is fixedly mounted on the bottom of the weighing material tank (23); a second control valve (26) is fixedly mounted on the discharge pipe (25); and a hose (27) is fixedly mounted on the bottom of the discharge pipe (25).

9. A cold-resistant polymer blending device for film capacitors according to claim 8, characterized in that: The lifting and feeding assembly comprises a lifting motor (30) fixedly mounted on the mounting frame (22); a screw rod (31) is fixedly mounted on the output end of the lifting motor (30); a connecting tube (32) is threadedly connected to the screw rod (31); a limit plate (33) is fixedly mounted on the bottom of the mounting frame (22); the connecting tube (32) is slidably connected to the limit plate (33); a feeding pipe (28) is fixedly mounted on the bottom of the connecting tube (32); and a feeding end of the feeding pipe (28) is fixedly connected to a hose (27); An exhaust pipe (19) is fixedly mounted on the feed pipe (34), a filter rod (21) is fixedly mounted inside the exhaust pipe (19), and a docking joint (20) is fixedly mounted at the input end of the exhaust pipe (19); An air intake pipe (29) is fixedly mounted at the bottom of the conveying pipe (28). When the air intake pipe (29) descends, the air intake pipe (29) is inserted into the exhaust pipe (19).

10. A method for blending cold-resistant polymers for film capacitors, comprising a device for blending cold-resistant polymers for film capacitors as claimed in claim 5, characterized in that: The following steps are involved: Step 1: aligning the feed pipe (34) with the lifting and discharging assembly, and then driving the lifting and discharging assembly to descend and dock with the feed pipe (34) and docking the air intake pipe (29) with the exhaust pipe (19); Step 2: Open the first control valve (5) and the second control valve (26) to add material into the inner tube (3); Step 3: During the process of adding materials, the stirring component rotates; Step 4: During the process of adding materials, the weight of the raw materials and the counterweight block (13) cooperate to drive the mounting plate (10) and the piston plate (11) to descend. During this process, the gas in the mounting chamber enters the mixing chamber and is discharged into the feed pipe (28) through the exhaust pipe (19) and the intake pipe (29) under the pressure of the added raw materials. Step 5: After the raw material is added, the first control valve (5) and the second control valve (26) are closed, and the lifting and feeding assembly is separated from the mixing tank; Step 6: The stirring component stirs the material, and at the same time, the driving component drives the mixing tank to rotate, and the electromagnetic heater (4) is energized to heat the raw material; Step 7: The feed pipe (34) is vertically downward, the first control valve (5) is opened, and the counterweight (13) drives the piston plate (11) and the mounting plate (10) to descend to discharge the blended materials out of the mixing tank.

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