131 results about "Sheet film" patented technology

The utility model relates to the technical field of sheet winding, in particular to a rapid winding device in a sheet film laminating machine. A rapid coiling device in a sheet film laminating machine comprises a sheet used by the film laminating machine, and further comprises a support and a coiling device, the supporting assembly is arranged on the top of the support and used for supporting the moving sheet; the winding assembly is arranged at the bottom of the support, the winding assembly comprises a sleeve, a fixing seat and a driving part for driving the sleeve to rotate, the fixing seat is fixed to the support, and the sleeve is rotationally connected to the fixing seat through a rotating shaft. The device has the advantages that the cut sheet is firmly attached to the sleeve through the sheet attaching assembly, and the design can effectively avoid the situation that due to the fact that the flexible sheet is tightened due to too large tension and bounces off after being cut off, the cut-off area of the sheet is damaged, and the service life of the sheet is prolonged. And an operator also needs to wind the broken and flying sheets on the sleeve onto the sleeve again, so that the complexity of operation is increased.

According to the film pasting and magnetizing equipment for the magnetic sheet, automatic feeding of an upper film, a lower film and the magnetic sheet is achieved through the upper film feeder, the lower film feeder and the magnetic sheet feeder, the upper film, the lower film and the magnetic sheet are automatically pasted and combined, and then the combined upper film, the combined lower film and the combined magnetic sheet are magnetized to form a magnetic assembly. In the production process of the magnetic assembly, the film attaching precision of the magnetic sheet and the production efficiency of the magnetic assembly are improved.

The invention relates to a bottled probiotic powder production system which comprises a rack, a mold conveying belt reciprocates on the rack, and a plurality of rows of containing holes are formed in the mold conveying belt; cup bodies and cup covers are oppositely conveyed to the two sides of the rack correspondingly, and the number of the conveying columns of the cup bodies and the number of the conveying columns of the cup covers are matched with the number of the containing holes. At least a cup body grabbing station, a cup body static electricity eliminating station, a powder filling station, a powder sucking station, a sheet film placing station, a heat sealing station, a cup cover grabbing station and a pressing station are sequentially arranged at the top of the rack from the cup body conveying end to the cup cover conveying end; and the control system controls the cup bodies and the cup covers to be orderly and oppositely conveyed towards the direction of the rack, coordinates the stations to orderly and cooperatively work, and completes detection and conveying of the empty cup bodies and the empty cup covers, static electricity elimination of the cup bodies, powder filling of the cup bodies, powder suction of the cup bodies, heat sealing of the cup bodies and press fit of the cup bodies and the cup covers. The full-automatic production system from powder to bottled finished products is achieved, and the production efficiency and the stability of the product quality are improved.

The application relates to an automatic production device and method of a gusset bag, and relates to the technical field of a packaging bag production device, and comprises a bag body forming device, the bag body forming device comprises four groups of discharging mechanisms arranged above, below, left and right, which are used for releasing sheet films and surrounding four sides of the bag body; a gusset sheet mounting device is arranged at a discharging end of the bag body forming device, is used for conveying the gusset sheet between two adjacent sheet films, and pre-fixes the gusset sheet and the sheet film; a hot wire edge sealing device is arranged at a discharging end of the gusset sheet mounting device, comprises multiple groups of heating mechanisms, and performs heat sealing on the pre-fixed position of the gusset sheet and the sheet film; and a fixed-length cutting device is arranged at a discharging end of the hot wire edge sealing device, comprises a cutter assembly that can be lifted up and down, and is used for fixed-length cutting of continuous sheet films. The application can reduce manual participation, improve the production quality and efficiency of products, the products can be continuously produced, and the consistency is higher.

The invention discloses an automatic film pasting production line for a power battery cover plate, which comprises a power battery cover plate feeding conveying line, a turnover feeding mechanism, a carrier circulating line, an electrode column synchronous film pasting station, a first pin insulation sheet film pasting station and a second pin insulation sheet film pasting station, the electrode column synchronous film pasting station comprises an electrode column film pasting device provided with an electrode column protective film supply mechanism and an electrode column film pasting mechanism; the first pin insulation sheet film pasting station and the second pin insulation sheet film pasting station respectively comprise a pin insulation sheet film pasting device which is provided with a pin insulation sheet protection film supply mechanism, a pin insulation sheet film pasting mechanism and a film pasting supporting mechanism. The requirement for automatic film pasting of dead corner parts of the battery cover plate is met, and the requirement for double-position film pasting can be met without turning or turning over the battery cover plate. And steering laminating and smoothing operation can be realized, so that the qualified rate of the laminated film is obviously improved. The automatic operation is smooth, stable and efficient, the production efficiency is improved, and the product film pasting yield is guaranteed.

The utility model discloses a tinned thin plate film coating device, and relates to the technical field of film coating devices, in particular to a tinned thin plate film coating device which comprises a bottom plate, a supporting block is fixedly connected to the upper portion of the bottom plate, one end of the supporting block is rotationally connected with an unwinding disc, and a film disc supporting arm is fixedly connected to the middle of the bottom plate. According to the tin-plated thin plate film coating device, the cooling box and the guide rod are arranged in a matched mode, in the using process, in the winding control process of the second motor, a thin plate subjected to film coating can be supported by the guide rod, and the thin plate subjected to film coating can be suspended in the cooling box to be cooled; according to the thin plate film laminating device, the thin plate is cooled, so that damage caused by contact with the box body is avoided while the thin plate is shrunk, the thin plate subjected to film laminating can be cooled, the thin plate is shrunk and tightly attached, and the purpose of improving the thin plate film laminating quality is achieved.

The utility model relates to the technical field of steel wire rope lubrication, in particular to a steel wire rope lubricating device. A steel wire rope lubricating device comprises a lower lubricating sleeve, the lower lubricating sleeve is hinged to an upper lubricating sleeve, leaking plates are arranged in the lower lubricating sleeve and the upper lubricating sleeve, leaking holes distributed at equal intervals are formed in each leaking plate, oil feeding cavities are formed between the lower lubricating sleeve and the leaking plate in the lower lubricating sleeve and between the upper lubricating sleeve and the leaking plate in the upper lubricating sleeve, and a baffle ring is arranged in each oil feeding cavity. The baffle rings divide the oil feeding cavity into an inner cavity and an outer cavity, and hard thin films distributed at equal intervals are arranged on each baffle ring. According to the utility model, through the baffle rings and the hard film arranged in the lower lubricating sleeve and the upper lubricating sleeve, when oil supply is stopped, the hard film is in a closed state without pressure, so that the condition that the oil supply pipe is blocked due to backflow of lubricating oil in contact with a steel wire rope is prevented.

The utility model relates to the field of metering and feeding equipment discloses a PC board piece film raw material precision metering and feeding equipment, including the box, two supports are fixedly connected in the box, two the middle fixedly connected with the distribution shell of support, the distribution shell top is equipped with the feed inlet, the distribution shell is provided with the distribution tray inside, the distribution tray upper and lower ends are equipped with the distribution bin, the distribution tray is provided with the abutment inside, the abutment is connected with the lifting plate through the lifting assembly, the box top fixedly connected with the butt joint, the butt joint top is equipped with the butt joint hole, the butt joint hole is provided with the limit rod inside, the limit rod side is equipped with the limit hole, in the utility model, through the distribution bin volume ration, double motor drives distribution tray conveying and adjusting volume respectively, ensures that distribution is accurate and flexible, through the linkage of the shift lever, spring and other components, realizes the quick loading and unloading of the hopper, is convenient for cleaning replacement, guarantees raw material clean, promotes the operating convenience.

The present invention discloses a nano-diamond / graphene composite vertical lamella film electrode and a preparation method thereof. Through a hot wire chemical vapor deposition system and a microwave plasma vapor deposition system, the relative contents of graphite and diamond on the film surface are effectively regulated to prepare a nano-diamond / graphene composite vertical lamella film electrode with supercapacitor characteristics.

A film cutting method for a sheet film laminating device with a rotatable cutter. The laminating device includes a transmission part, a film laminating part, and a cutting part. The transmission part is horizontally arranged, and the film laminating part and the cutting part are arranged front and back above the transmission part. The sheet can be moved to the position of the film laminating part by the drive of the transmission part to complete the surface film laminating work. The sheet with the film laminated continues to move to the position of the cutting part to complete the numerically controlled fixed-length film cutting work. The transmission part controls the power device through the numerical control and servo control unit to control the transportation speed and start and stop. The cutting part includes a cutter assembly that is slidably arranged perpendicular to the transportation direction of the transportation line. A connecting shaft is rotatably provided at the lower end of the cutter assembly, and a freely rotatable cutting knife is vertically provided at the lower end of the connecting shaft. The cutting knife rotates around the vertical direction with the connecting shaft, and the cutting of the film at the end or side of the sheet is completed by changing the relationship between the plane where it is located and the transportation direction of the sheet. At the same time, the cutting knife elastically presses against the surface of the sheet, ensuring that the sheet is not damaged while making the cutting of the film more complete.

A preparation method for a dry electrode sheet film and a preparation device for a dry electrode sheet film. The preparation method for a dry electrode sheet film comprises: providing a pair of first rollers (20) having a roller diameter of d1, setting the pressure of the first rollers (20) to be t1, and roll-pressing fibrillated powder by means of the pair of first rollers (20) to obtain a primary film (300) having a primary thickness; providing a pair of second rollers (40) having a roller diameter of d2, wherein d2<d1, setting the pressure of the second rollers (40) to be t2, wherein t2<t1, and performing primary thinning on the primary film (300) by means of the pair of second rollers (40) to obtain a secondary film (400) having a secondary thickness; and providing a pair of third rollers (50) having a roller diameter of d3, wherein d3>d1, setting the pressure of the third rollers (50) to be t3, wherein t3>t1, and performing secondary thinning on the secondary film (400) by means of the third rollers (50) to obtain a target film (500) having a target thickness.

The application discloses a kind of heat insulation sheet film pasting film sending film devices, including by the horizontal support plate of external support fixed support, the top of the horizontal support plate is equipped with the L-shaped air duct driven to reciprocate, the end of the L-shaped air duct is fixedly connected with the adsorption head that blue film is adsorbed by being pressed down, the top of the horizontal support plate is equipped with the cutting knife that blue film is cut, the end of the horizontal support plate is fixedly connected with vertical support plate, the surface of the vertical support plate is fixedly connected with the release roller that blue film in winding state is released by rotation and the material receiving roller that the release film on blue film is actively wound and stored.The application, by the horizontal support plate is supported and fixed by external support, the horizontal support plate plays a supporting role to the transport of blue film, L-shaped air duct drives the continuous movement of horizontal support plate;Adsorption head realizes the adsorption transfer of blue film after cutting on the horizontal support plate when continuously moving along with L-shaped air duct, realizes film sending operation.

The application provides a dry-process electrode tab film and a preparation method thereof, and belongs to the technical field of dry-process electrode manufacturing. The dry-process electrode tab film comprises active material particles, conductive agent particles and an adhesive, the adhesive is in a fibrous form, the active material particles comprise large-diameter active material particles and small-diameter active material particles, wherein the particle size D50 of the large-diameter active material particles is 4-10 mu m, the particle size D50 of the small-diameter active material particles is 0.9-1.8 mu m, and the small-diameter active material particles are arranged in an area close to and adhered to the adhesive along the extension direction of the adhesive. The dry-process electrode tab film can have good film-forming property and high compaction density.

The utility model relates to an online rolling and slitting integrated unit for multiple groups of gilding machines, and belongs to the technical field of gilding equipment. Comprising a rack, an unwinding shaft, a gold stamping unit, a slitting unit and a winding unit are sequentially arranged on the rack, a sheet film barrel is arranged on the unwinding shaft, and a sheet film is unwound through the unwinding barrel; the gold stamping unit carries out gold stamping on different positions of the sheet film to form a multi-splicing film; the slitting unit is used for slitting the sheet film to form a plurality of slitting films; the winding unit comprises a winding shaft, a plurality of sub-winding drums are arranged on the winding shaft, and the slitting films are wound on the corresponding sub-winding drums respectively. The slitting unit comprises two slitting side plates which are symmetrically arranged, a slitting fixing shaft is erected between the two slitting side plates, a plurality of slitting bases are arranged on the slitting fixing shaft, and slitting knives are arranged on the slitting bases respectively. The multi-splicing gold stamping, slitting and rolling device is convenient to operate, multi-splicing gold stamping, slitting and rolling are completed at a time, the secondary slitting and back rolling procedures of materials are avoided, and the working efficiency is improved.

The utility model relates to the technical field of biological detection sealing film packaging, in particular to a sheet film moving assembly used for moving a sheet film extracting assembly. The sheet film moving assembly comprises a transverse moving part and a longitudinal moving part; the transverse moving part drives the sheet film extracting assembly to transversely move in a rotating mode, and the longitudinal moving part drives the sheet film extracting assembly to longitudinally move in a longitudinal transmission mode. And the sheet film can be replaced only by opening the sheet film inlet and outlet, so that the structure is more convenient.

The utility model relates to the technical field of sheet-shaped membrane materials, in particular to a sheet-shaped membrane material packaging structure which comprises a first membrane material, a second membrane material and a third membrane material are arranged at the lower end of the first membrane material respectively, and dust covers are arranged on the peripheries of the first membrane material, the second membrane material and the third membrane material in a sleeved mode. A first air bubble film is laid between the second membrane material and the first membrane material, a second air bubble film is laid between the third membrane material and the second membrane material, and the two ends of the peripheries of the first membrane material, the second membrane material and the third membrane material are sleeved with a first clamp and a second clamp respectively. The air bubble film stacking device has the structure that the air bubble film is placed between the sheet-shaped film materials, the sheet-shaped film materials are prevented from being adhered or abraded in the stacking process, and then the logistics transportation effect can be effectively improved.

The invention relates to the technical field of ink-jet printing, and discloses a film liquid for ink-jet printing and a preparation method for forming a film by spraying the film liquid through an ink-jet printer, the film liquid meeting the requirement is uniformly sprayed on the surface of a flat sheet film through the ink-jet printer, and after drying and firing, a flat and uniform plate-type ceramic film with accurate thickness is obtained. Any accurately-positioned micron-to-millimeter-scale convex patterns can be prepared on the surface of the film through multiple times of spraying, and the convex patterns and the base film form a three-dimensional dot matrix film or a biomimetic film; double layers or multiple layers of multi-layer composite films with completely different properties can be sprayed; the required composite membranes with different three-dimensional properties or different three-dimensional structures can also be accurately controlled and sprayed through a computer, so that the design capability, the anti-pollution capability and the regeneration capability of the membranes are greatly improved, and membrane liquid is uniformly sprayed on the surface of a membrane support body through an ink-jet printer; a continuous, flat and smooth surface film with consistent thickness and controllable quality can be formed, and the quality and performance of the film are effectively improved.

A film type planar heating element for preventing electromagnetic waves is configured in a form of multiple layers of films to generate heat, the film type planar heating element comprising: a base film made of synthetic resin and mounted on a floor in a form of sheet film; a carbon heating unit made of carbon materials and arranged in multiple rows to generate heat planarly on a top side of the base film; a pair of center-adjacent copper foil busbars disposed in a center area of the base film, applying current to the carbon heating unit, and facing each other in a close distance so that intensities of electromagnetic waves and magnetic field are mutually canceled each other when the current is applied; a pair of center silver busbars formed between the carbon heating unit and the center-adjacent copper foil busbars and made of silver materials allowing the current, which is applied to the center-adjacent copper foil busbars, to smoothly flow to the carbon heating unit, and a Lamirex film coated on the top side of the base film to protect the carbon heating unit and the center-adjacent copper foil busbars.

The invention relates to the technical field of capacitors, and particularly discloses a production process of a multilayer chip ceramic capacitor. The production process of the multilayer chip ceramic capacitor comprises the following steps: step 1), uniformly mixing clay, diopside, silicon nitride, zirconium oxide whiskers, a solvent and an auxiliary agent to obtain a mixture, and carrying out tape casting on the mixture to form a ceramic film; step 2), printing an electrode on the ceramic thin film to form a prefabricated thin film; the method comprises the steps of (1) preparing a multilayer ceramic capacitor, (2) preparing a multilayer prefabricated film, (3) laminating and cutting the multilayer prefabricated film to form a capacitor blank, (4) discharging glue from the capacitor blank and sintering to obtain a rough capacitor, (5) chamfering and end sealing the rough capacitor to obtain a refined capacitor, and (6) electroplating the refined capacitor to obtain the multilayer ceramic capacitor.

The invention provides a full-automatic film sealing instrument, and belongs to the technical field of film sealing. Comprising a touch screen, a heat sealing bin, a sheet film bin, a film moving mechanism, a heat sealing mechanism and a driving mechanism. The driving mechanism is fixed on a cross beam fixedly arranged at the upper part in the instrument; the heat sealing mechanism is arranged below the driving mechanism, the heat sealing bin is arranged below the heat sealing mechanism, and the sheet film bin is arranged below the heat sealing bin. The film moving mechanism is arranged below the driving mechanism, is connected with the driving mechanism and can horizontally move up and down; the film moving mechanism comprises a film moving disc; multiple suckers are arranged at the bottom of the film moving disc. The heat sealing mechanism comprises a mounting plate, a heating plate and a heat sealing motor, the mounting plate is fixedly connected with the inner wall of the film sealing instrument, the heat sealing motor is fixed on the mounting plate, the heating plate is connected with the bottom of the mounting plate, and the heating plate is horizontally arranged and can move up and down. According to the invention, the sheet film can be automatically grabbed and placed, and the sample plate is subjected to heat sealing, so that the sheet film is prevented from being polluted.

The invention relates to a functional high-strength polyethylene film material continuous forming method which comprises the following steps: S1, mixing a photosensitizer and a grafting monomer to prepare a turbid liquid, spraying the turbid liquid into polyethylene, and stirring and dispersing to obtain a composite material; s2, adding the composite material in the S1 into a screw extruder for extrusion to obtain a thick film material, and then performing continuous isobaric pressing to obtain a thin film material; and S3, carrying out multi-time hot drafting on the thin film material in the S2 to obtain a film material product, carrying out ultraviolet radiation in an inert atmosphere, and rolling to obtain the functionalized high-strength polyethylene film material. Compared with the prior art, continuous forming of the high-strength UHMWPE film material can be achieved at low temperature, the preparation process does not need a solvent and is environmentally friendly, the surface of a product has polarity, and the interface bonding force is high when the composite material product is manufactured.

The invention provides a cross film as well as a preparation method and application thereof, and belongs to the technical field of polymer films. The cross film is formed by compounding at least two layers of sheet films in a cross manner; wherein the sheet film is prepared by rotationally cutting and rolling a base film at 46-47 degrees, and the orientation degree of the base film is 0.70-0.85. By controlling the orientation degree and the rotary cutting angle of the base film, the problems of warping and edge curling of the crossed film can be effectively solved.

The invention discloses a film covering method for a heat-conducting graphene cooling fin, and relates to the technical field of cooling fin film covering, the method comprises the following steps: S1, preparing a graphene cooling fin substrate; s2, performing plasma treatment on the graphene cooling fin substrate, and forming a pit-shaped microstructure on the surface of the graphene cooling fin substrate; wherein the plasma treatment comprises plasma cleaning and plasma bombardment; and S3, performing vacuum coating treatment on the surface of the graphene cooling fin substrate subjected to plasma treatment to obtain the heat-conducting graphene cooling fin with the insulating layer. Through the synergistic effect of plasma cleaning and plasma bombardment in the step S2, a pit-shaped microstructure is formed on the surface of the graphene cooling fin substrate, and uniform deposition and mechanical embedding of an insulating layer in vacuum coating in the subsequent step S3 are facilitated, so that the adhesion firmness of the insulating layer is enhanced. Therefore, the technical problem that in the prior art, the adhesive force of a covering film of a heat conduction graphene cooling fin is insufficient is solved.

The invention discloses a printed sheet laminating method which comprises the following steps: arranging an image-text layer and a hot melt adhesive layer which are laminated on the surface of a base material layer in an online manner; an adhesive film layer is arranged on the surface of the hot melt adhesive layer; and heating and pressing are performed, so that the hot melt adhesive layer and the adhesive film layer are compounded together. According to the printed sheet laminating method, the image-text layer and the hot melt adhesive layer are arranged by the printing machine in an online manner, so that the influence of the hot melt adhesive layer on the color of the printed sheet is preposed, and the subsequent laminating operation basically does not influence the printing color. Therefore, an operator of a printing machine table can directly adopt the laminating sample provided by a client to check the printing color, and the risk that the color of a printed sheet and the color of the laminating sample of the client are within the allowable error range during printing but the color of the printed sheet and the color of the laminating sample of the client exceed the allowable error range after laminating is greatly reduced.

The invention relates to the technical field of preparation of anti-counterfeiting films, and discloses a preparation method of a polarized anti-counterfeiting two-way stretch film and an anti-counterfeiting film, the preparation method comprises the following steps: (1) after a polymer material is melted and flows out, cooling to form a casting sheet film; (2) the casting piece film is longitudinally stretched, specifically, the casting piece film sequentially passes through a plurality of hot rollers and a plurality of cold rollers, characteristic patterns are arranged on the surface of the last hot roller, and the casting piece film is processed through the last hot roller to form the characteristic patterns; (3) carrying out transverse stretching; and (4) finally, carrying out heat setting and post-treatment to prepare the anti-counterfeiting film. According to the method, when the surface of the last hot roller which is longitudinally stretched is treated, characteristic patterns are formed in a casting piece film, so that local stretching is not uniform, the orientation degrees of molecules in the film at different positions are different, the larger the difference of the orientation degrees of the internal molecules is, the more obvious the effect of filtering or twisting light is, and the more obvious the effect of filtering or twisting light is. And the anti-counterfeiting effect is better.

The present invention relates to a process for preparing a three-dimensional logo that is healthy, environmentally friendly, has good adhesion and high preparation efficiency, and comprises the following steps: spraying a logo pattern on the upper surface of a TPU film; applying glue on the lower surface of the TPU film and attaching a base film; cutting along the edge of the logo pattern of the product in step 2 by laser cutting to separate a single logo pattern on the TPU film to form a logo surface film layer, and cutting the TPU film and the base film together into equidistant sheet film plates; tearing off the logo surface film layer on the sheet film plate and attaching it to the bottom surface of a mold cavity of an injection mold; injection molding an injection molded body in the mold cavity of the injection mold, and fixing the logo surface film layer to the surface of the injection molded body; applying hot melt glue to the bottom surface of the injection molded body by a glue applying device and drying it, so that a layer of hot melt glue layer is attached to the bottom surface of the injection molded body; heating the hot melt glue layer on the injection molded body by a heating device to form a molten state, and then attaching it to the fabric.

The present application relates to a kind of porous dry method electrode preparation methods, active material, powder binder and powder pore-forming agent are added in mixer, after being mixed uniformly, the powder mixture with uniform particle size distribution is obtained by pulverizer, high shear is provided by twin-screw extruder or open mill, powder binder is fiberized so that sheet forming is formed, further by rolling, the electrode sheet film with target compactness and thickness is formed, finally by heating and drying or solution infiltration treatment to the electrode containing electrode sheet film, porous electrode is obtained.The porous dry method electrode preparation method is simple and easy to operate, and the manufacturing cost is low, suitable for industrialized production application.

The utility model relates to the technical field of polymer filtering membrane preparation, and discloses membrane preparation equipment which comprises a batching device, a feeding device, an unwinding device, a membrane coating device, a curing device, a cleaning device, a first winding device and a second winding device, the batching device is used for preparing film coating liquid; the feeding device is used for conveying the film coating liquid; the unwinding device is used for unwinding a base film; the film coating device is used for coating a base film with film coating liquid; the curing device is used for curing the film coating liquid coated on the base film to form a flat sheet film; the cleaning device is used for cleaning the flat sheet membrane; the first winding device is used for winding the base film; the second winding device is used for winding the flat sheet membrane; according to the film making equipment provided by the utility model, through the cooperation of the batching device, the feeding device, the unwinding device, the film coating device, the curing device, the cleaning device, the first winding device and the second winding device, the improvement of the accuracy of scientific research experiment data can be facilitated, the film making time can be shortened, and the production efficiency can be improved.

The utility model relates to a locally reinforced insulating film which wraps the outer side surface of a pole core of a lithium ion battery and comprises a film main body, the film main body is of a sheet-shaped film structure, at least one strip-shaped reinforcing sheet is arranged on the surface of the film main body, and the strip-shaped reinforcing sheet extends along the length direction of the film main body; the utility model also relates to a lithium ion battery which comprises a shell, a shell cover, a pole core and a locally reinforced insulating film, and the insulating film is wrapped on the outer surface of the pole core; an opening is formed in the end of the shell in the length direction, the pole core wrapped with the insulating film is inserted into the containing cavity of the shell through the opening, and the shell cover is installed on the opening in a sealed mode. The rigidity of the pole core is locally enhanced by the long-strip reinforcing sheet of the insulating film, the pole core is conveniently arranged in the shell after being locally enhanced, and the insulating film is not easily scraped by an opening of the shell.