A bidirectional stretching machine for capacitor film and stretching control method

Abstract

The present invention belongs to the technical field of capacitor film production, and particularly relates to a biaxial stretching machine for capacitor film and a stretching control method. The biaxial stretching machine comprises: a frame; a reel, which is arranged at one end of the frame and is provided with a reeling motor for driving the reeling motor to rotate; a reeling roller, which is arranged at the other end of the frame and is provided with a reeling motor for driving the reeling motor to rotate; a stretching device, which is arranged in the frame and between the reeling roller and the reeling roller, and comprises: a heating roller, a receiving roller component, a longitudinal stretching component, a positioning roller component, a transverse stretching component and a guide roller for the film to pass through in sequence; the biaxial stretching machine heats the thick film through the heating roller, then performs longitudinal stretching through the longitudinal stretching component, and then performs transverse stretching through the transverse stretching component, and adjusts the operation of the longitudinal stretching component and the transverse stretching component according to the temperature to control the film stretching ratio.

Description

Technical Field

[0001] The invention belongs to the technical field of capacitor films, and in particular relates to a bidirectional stretching machine and a stretching control method for capacitor films. Background Art

[0002] Biaxially oriented polypropylene film has the advantages of light weight, non-toxicity, high mechanical strength, good dimensional stability, low dielectric loss, electrical insulation, high breakdown strength and strong self-healing properties, and is particularly suitable for the field of film capacitors. With the rapid development of the electronic information industry and the power industry, the demand for capacitor films is also increasing.

[0003] Traditional capacitor film stretching equipment supports both sides of the film through two support rollers, and then a stretching roller located between the two support rollers is displaced to stretch the film longitudinally; the two sides of the film are fixed, and the driving device is displaced to stretch the film transversely; and in the process of longitudinally stretching the film, since different process technical conditions such as stretching ratios and stretching temperatures are often required for support, it is impossible to automatically adapt to the stretching amplitude according to the temperature during the biaxial stretching of the thick film, which can easily cause damage to the film during the stretching process. Summary of the invention

[0004] The object of the present invention is to provide a film stretching machine and a stretching control method with a stable structure and an ideal longitudinal stretching effect in view of the above-mentioned technical problems.

[0005] In view of this, the present invention provides a biaxial stretching machine for capacitor film, comprising:

[0006] The frame is equipped with a control cabinet, which contains control circuits, controllers, relays and other electronic components. The operation of the stretching machine is controlled by the controller programming;

[0007] An unwinding roller is arranged at one end of the frame and is provided with an unwinding motor for driving the unwinding roller to rotate;

[0008] A winding roller is arranged at the other end of the frame and is provided with a winding motor for driving the winding roller to rotate;

[0009] The stretching device is arranged in the frame and between the winding roller and the unwinding roller, and includes: a heating roller, a receiving roller component, a longitudinal stretching component, a positioning roller component, a transverse stretching component and a guide roller for the film to pass through in sequence;

[0010] The longitudinal stretching components include:

[0011] A plurality of longitudinal stretching rollers are provided and distributed circumferentially in the frame;

[0012] A plurality of end support assemblies are respectively arranged at both ends of each longitudinal stretching roller, and a positioning groove is formed on the frame for the ends of the end support assemblies to extend out of the frame;

[0013] A plurality of side receiving assemblies, respectively arranged on a side of each end supporting assembly away from the longitudinal stretching roller;

[0014] Two external driving components are respectively arranged on the outer sides of both sides of the frame and drive the side bearing components on the sides to drive the end supporting components on the sides to move back and forth along the length direction of the positioning groove.

[0015] In the above technical solution, further, the end support assembly includes:

[0016] An end support block is formed with a placement groove, and one end of the longitudinal stretching roller is rotatably fixed to the placement groove through a bearing;

[0017] An end extension block is formed at one end of the end support block away from the placement groove and is integrally formed with the end support block;

[0018] The end limit frame is arranged on the outside of the frame and surrounds the positioning groove, and the inner side of the end limit frame is provided with a limit groove extending along the length direction of the positioning groove;

[0019] An end positioning block is slidably disposed in the end limit frame, and one side is integrally formed with the end extension block;

[0020] A plurality of end floating components are arranged on the end positioning block and are limitedly matched with the limit grooves of the end limit frame;

[0021] The end rotation groove is spherical and formed on the side of the end positioning block away from the end extension block;

[0022] The end positioning block is provided with protruding positioning parts on both sides of the positioning groove, and the end positioning block is provided with a plurality of floating holes penetrating the positioning parts on both sides and for accommodating the end floating components.

[0023] In the above technical solution, further, the side support assembly includes:

[0024] The side connector is rotatably matched with the end rotation groove of the end support assembly;

[0025] A side extension rod, one end of which is integrally formed on a side of the side connector away from the end support assembly, and the other end of which is hingedly connected to the outer drive assembly;

[0026] Two side supports are respectively arranged on both sides of the end support assembly, and one end is rotationally fixed to the frame, and the other end supports the end positioning block in the end support assembly for rotational cooperation;

[0027] The end positioning block in the end support assembly is elastically retained on the end positioning block under the support of the side support member.

[0028] In the above technical solution, further, the side support member includes:

[0029] Two side connecting plates are symmetrically arranged with each other, one of which is rotatably connected to the frame by bolts, and the other is rotatably connected to the end positioning block of the end support assembly;

[0030] Two side connection mechanisms are respectively arranged on the inner sides of the two side connection plates, and the two side connection mechanisms are arranged opposite to each other;

[0031] A side supporting mechanism, arranged between the two side connecting mechanisms;

[0032] The side connection mechanism includes:

[0033] A side push plate abuts against the side connecting plate;

[0034] A side positioning ring, one end of which abuts against the end support mechanism, and the other end of which abuts against the side push plate;

[0035] A plurality of side push positioning rods are evenly distributed and one end of the rods is slidably matched with the side supporting mechanism, and the other end of the rods is slidably matched with the side connecting plate and the side push plate.

[0036] In the above technical solution, further, the side support mechanism includes:

[0037] Two side support plates are symmetrically arranged and respectively abut against the side positioning rings on the sides where they are located, and a through hole is formed in the middle of the side support plates;

[0038] A side support spring is arranged between the two side support plates and has two ends respectively abutting against the side support plates;

[0039] A plurality of side support positioning rods are evenly distributed between the two side support plates, and both ends of the rods are respectively slidably matched with the side support plates on the sides where they are located;

[0040] The side support rod is arranged on the inner side of the side support spring and both ends of the rod extend into the through holes on the side support plate respectively.

[0041] In the above technical solution, further, the external drive assembly includes:

[0042] An outer support frame is arranged on the outer side of the frame;

[0043] An external driver is arranged on the external support frame with the driving end facing the frame;

[0044] An external connection seat is arranged on the driving end of the external driver, and one end of the side bearing assembly is rotatably connected to the external connection seat;

[0045] A plurality of external telescopic positioning mechanisms are evenly distributed, one end of which is connected to the external connecting seat, and the other end of which is connected to the frame.

[0046] In the above technical solution, further, the external telescopic positioning mechanism includes:

[0047] An inner telescopic sleeve, one end of which is fixed to the frame by bolts or other fasteners, and the other end of which is arranged toward the inner support plate of the outer connecting seat;

[0048] The outer telescopic cylinder has one end fixed to the inner support plate of the outer connecting seat by bolts or other fasteners, and the other end slidingly cooperates with the outer wall of the inner telescopic sleeve;

[0049] an inner float chamber coaxially formed within the inner telescopic sleeve;

[0050] The outer floating chamber is coaxially formed in the inner telescopic sleeve and is located outside the inner floating chamber, and a receiving hole communicating with the inner floating chamber is formed on the inner floating chamber;

[0051] The telescopic rod is coaxially arranged on the inner side of the outer telescopic cylinder, and one end of the telescopic rod is fixedly connected to the inner support plate of the outer connecting seat, and the other end of the telescopic rod extends into the inner floating chamber and is formed with a floating plug that is sealingly and slidingly matched with the inner floating chamber;

[0052] An outer floating ring is arranged in the outer floating chamber and slidably cooperates with the outer floating chamber;

[0053] An inner telescopic floating spring is arranged in the outer floating chamber and has one end abutting against an end of the outer floating chamber away from the frame, and the other end abutting against the outer floating ring;

[0054] The outer telescopic floating spring is sleeved outside the telescopic rod and one end of the spring abuts against the bottom of the outer telescopic cylinder and the other end abuts against the end surface of the inner telescopic sleeve.

[0055] A stretching control method for a biaxial stretching machine of a capacitor film, characterized by comprising the following steps:

[0056] Step 1: Place the thick film roll to be stretched on the unwinding roller, and fix one end of the thick film roll on the winding roller after passing through the heating roller, the receiving roller component, the longitudinal stretching component, the positioning roller component and the transverse stretching component in sequence;

[0057] Step 2: Control the longitudinal stretching component to longitudinally stretch the thick film at the location;

[0058] Step 3: Control the winding roller to move the thick film that has been longitudinally stretched by the longitudinal stretching component to the transverse stretching component, and at the same time move the thick film that has not been transversely stretched to the longitudinal stretching component;

[0059] Step 4: Control the transverse stretching component to stretch the thick film at the location transversely, and control the longitudinal stretching component to stretch the thick film at the location longitudinally;

[0060] Step 5: Repeat steps 3 and 4 until all the thick film on the unwinding roller is unwound.

[0061] The beneficial effects of the present invention are:

[0062] 1. The biaxial stretching machine heats the thick film through a heating roller, then stretches it longitudinally through a longitudinal stretching component, and then stretches it transversely through a transverse stretching component. According to the detected film temperature, the operation of the longitudinal stretching component and the transverse stretching component is adjusted to control the film stretching ratio;

[0063] 2. The longitudinal stretching assembly can accurately control the longitudinal stretching amplitude of the film through the cooperation of the end support assembly, the side bearing assembly and the external drive assembly, thereby controlling the stretching ratio;

[0064] 3. At the same time, the cooperation of the side receiving assembly and the external driving assembly can ensure the stable operation of the longitudinal stretching roller during the stretching process, thereby reducing the damage of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic diagram of the structure of the present invention;

[0066] Figure 2 It is a structural schematic diagram of the running track of capacitor film in a biaxial stretching machine;

[0067] Figure 3 It is a schematic structural diagram of the longitudinal stretching component in the present invention;

[0068] Figure 4 is a schematic cross-sectional view of a longitudinally stretched component in the present invention;

[0069] Figure 5 It is a structural schematic diagram of the external telescopic positioning mechanism of the present invention;

[0070] Figure 6 It is a schematic diagram of the structure of the cooperation between the middle end support assembly and the side receiving assembly of the present invention;

[0071] Figure 7 This is a cross-sectional diagram of the cooperation between the middle support assembly and the side support assembly of the present invention. Figure I ;

[0072] Figure 8 This is a cross-sectional diagram of the cooperation between the middle support assembly and the side support assembly of the present invention. Figure II ;

[0073] The markings in the figure are as follows: 1-frame, 2-unwinding roller, 3-winding roller, 4-heating roller, 5-receiving roller component, 6-longitudinal stretching roller, 7-positioning groove, 8-end support block, 9-end limit frame, 10-limiting groove, 11-end positioning block, 12-floating hole, 13-inner floating block, 14-floating ball, 15-floating support, 16-outer positioning sheet, 17-side connector, 18-side extension rod, 19-side connecting plate, 20-side push plate, 21-side positioning ring, 2 2-push positioning rod, 23-side support plate, 24-side support spring, 25-side support positioning rod, 26-side support rod, 27-external driver, 28-inner telescopic sleeve, 29-outer telescopic cylinder, 30-inner floating chamber, 31-outer floating chamber, 32-telescopic rod, 33-outer floating ring, 34-inner telescopic floating spring, 35-outer telescopic floating spring, 36-outer support frame, 37-outer connecting seat, 38-positioning roller component, 39-lateral stretching component, 40-capacitor film. DETAILED DESCRIPTION

[0074] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0075] Embodiment 1:

[0076] This embodiment provides a biaxial stretching machine for capacitor film, comprising:

[0077] Frame 1, with a control cabinet, which contains control circuits, controllers, relays and other electronic components. The operation of the stretching machine is controlled by the controller programming;

[0078] The unwinding roller 2 is arranged at one end of the frame 1 and is provided with an unwinding motor for driving the unwinding roller to rotate;

[0079] The winding roller 3 is arranged at the other end of the frame 1 and is provided with a winding motor for driving the winding roller to rotate;

[0080] The stretching device is arranged in the frame 1 and between the winding roller 3 and the unwinding roller 2, and includes: a heating roller 4, a receiving roller component 5, a longitudinal stretching component, a positioning roller component 38, a transverse stretching component 39 and a guide roller for the capacitor film 40 to pass through in sequence; wherein the heating roller 4, the receiving roller component 5, the positioning roller component 38 and the guide roller can be freely rotatably arranged on the frame 1;

[0081] The longitudinal stretching components include:

[0082] A plurality of longitudinal stretching rollers 6 are provided and distributed circumferentially in the frame 1;

[0083] A plurality of end support assemblies are respectively arranged at both ends of each longitudinal stretching roller 6, and a positioning groove 7 is formed on the frame 1 for the end of the roller to extend out of the frame 1;

[0084] A plurality of side receiving assemblies, respectively arranged on a side of each end supporting assembly away from the longitudinal stretching roller 6;

[0085] Two external drive components are respectively arranged on the outer sides of both sides of the frame 1 and drive the side bearing components on the side to drive the end support components on the side to reciprocate along the length direction of the positioning groove 7. The transverse stretching component 39 can be two symmetrical reciprocating clamping structures, which include a servo slide with a driving direction along the transverse direction of the film, an air gripper arranged on the slide, and a clamping plate arranged on the air gripper for clamping the transverse edge of the film, and there can be multiple air grippers, and the number of air grippers activated is adjusted according to the length of the film to be stretched.

[0086] In this embodiment, heating elements such as heating wires are provided in the heating roller 4, and the film is heated by the heating wires, so that the film can be stretched easily; and temperature sensors for detecting the temperature passing through the longitudinal stretching component and the transverse stretching component 39 are respectively provided on the frame 1, and the controller controls the extent of the film stretching by the longitudinal stretching component and the transverse stretching component 39 according to the temperature feedback from the temperature sensors. The number of longitudinal stretching rollers 6 in the longitudinal stretching component is 4-8, and the film is supported and longitudinally stretched by multiple stretching rollers, so that the ideal longitudinal stretching effect can be ensured and the damage to the film can be reduced. The end support assembly is used to better support the longitudinal stretching roller 6 in the frame 1; the frame 1 is formed with positioning grooves 7 on both sides, which are equal to the number of longitudinal stretching rollers 6. The positioning grooves are rectangular and evenly distributed along the circumference, and the width of the positioning grooves is toward the center of the circumference; the end support assembly is placed on the positioning groove, and then two external drive assemblies drive the side bearing assemblies on both sides to drive the end support assembly to move back and forth along the length direction of the positioning groove 7, so as to achieve the expansion or reduction of the diameter of the circle formed by several longitudinal stretching rollers 6. When expanding, it is the longitudinal stretching of the film. At the same time, the controller controls the displacement of the longitudinal stretching roller 6 to control the longitudinal stretching amplitude of the film. When shrinking, it is to loosen the film passing through the longitudinal stretching component. The two external drive assemblies can ensure the synchronous displacement of the two ends of the longitudinal stretching roller 6, and ensure that the adjacent longitudinal stretching rollers 6 are in a state of being parallel to each other, thereby ensuring the stretching effect and stability.

[0087] Embodiment 2:

[0088] This embodiment provides a biaxial stretching machine for capacitor film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0089] The end support assembly includes:

[0090] An end support block 8 is formed with a placement groove, and one end of the longitudinal stretching roller 6 is rotatably fixed to the placement groove through a bearing;

[0091] An end extension block is formed at one end of the end support block 8 away from the placement groove and is integrally formed with the end support block 8;

[0092] The end limit frame 9 is arranged outside the frame 1 and surrounds the positioning groove 7, and the two sides thereof are provided with limit grooves 10 extending along the length direction of the positioning groove 7;

[0093] The end positioning block 11 is slidably disposed in the end limiting frame 9, and one side is integrally formed with the end extension block;

[0094] A plurality of end floating components are arranged on the end positioning block 11 and are limitedly matched with the limiting groove 10 of the end limiting frame 9;

[0095] The end rotation groove is spherical and formed on the side of the end positioning block 11 away from the end extension block;

[0096] The end positioning block 11 and the limiting groove 10 form protruding positioning parts on both sides, and the end positioning block 11 is provided with a plurality of floating holes 12 that penetrate the positioning parts on both sides and are used to place the end floating components. The cross-section formed by the end positioning block 11 and the positioning parts on either side is a convex structure, while the cross-section of the end limiting frame 9 on either side with the limiting groove 10 is a concave structure.

[0097] In this embodiment, the end support block 8 can provide good support for the longitudinal stretching roller 6, and the longitudinal stretching roller 6 is fixed on the placement groove of the end support block 8 by bearing rotation, so that the friction generated by the longitudinal stretching roller 6 on the film can be reduced to prevent damage to the film. The end extension block is set between the end support block 8 and the end positioning block 11 to play a good connection role; the end positioning block 11 can be slidably installed in the end limit block, and the end limit block slides on the limit frame, so that the longitudinal stretching roller 6 supported on the end support block 8 also moves with it, and an end floating component is set to reduce the friction between the end positioning block 11 and the limit groove 10, thereby ensuring the smooth displacement of the longitudinal stretching roller 6; at the same time, the end rotation groove is set to facilitate the connection between the end support assembly and the side bearing member. Among them, an end placement block can be threadedly connected to the end positioning block 11, and the end rotation groove is formed between the end positioning block 11 and the end placement block, thereby reducing the processing difficulty of the end rotation groove. The end limit frame 9 is fixed to the outside of the frame 1 by fasteners such as bolts, and the end limit frame 9 can be formed by two outer frames that are interlocked with each other and fixed by bolts. The limit groove 10 is formed at the connection between the two outer frames, so that it is convenient to install the end positioning block 11 and to form the limit groove 10. The end positioning block 11 cooperates with the limit groove 10 through the positioning part, which can prevent the end positioning block 11 from rotating or tilting, thereby ensuring the stability of the longitudinal stretching roller 6 supported between the two end positioning blocks 11.

[0098] Embodiment 3:

[0099] This embodiment provides a biaxial stretching machine for capacitor film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0100] End floating components include:

[0101] Two inner floating blocks 13 are respectively arranged at two ends of the same floating hole 12, and a spherical groove is formed on the outer end side of the floating hole 12;

[0102] Two floating balls 14 are respectively arranged on the spherical grooves of the two inner floating blocks 13 and extend out of the floating holes 12 through the support of the inner floating blocks 13;

[0103] A floating support member 15 is disposed in the floating hole 12 and has two ends respectively abutting against the two inner floating blocks 13;

[0104] Two outer positioning pieces 16 are respectively arranged at two ends of the floating hole 12 and limit the floating ball 14 to prevent the floating ball 14 from leaving the floating hole 12;

[0105] The floating ball 14 is slidably matched with the limiting groove 10 .

[0106] In this embodiment, the setting of the floating ball 14 changes the contact mode between the positioning parts on both sides of the end positioning block 11 and the limiting groove 10 into rolling contact, which can reduce the friction force when the positioning parts slide on the limiting groove 10; the inner floating block 13 can provide good support for the floating ball 14, and provide a freely rolling support surface for the floating ball 14 through the spherical groove; the distance between the two floating blocks is controlled by the floating support 15 to prevent the positioning block and the floating ball 14 from falling into the floating hole 12; the outer positioning piece 16 can be fixed by bolts or rivets, etc. The setting of the outer positioning piece 16 can prevent the floating ball 14 from escaping from the floating hole 12, thereby improving the overall stability of the end floating component, and facilitating the assembly and fixing of the end positioning block 11 and the end floating assembly. The floating support can be a spring; the inner floating block 13, the inner floating ball 14 and the outer positioning piece 16 are all made of metal.

[0107] Embodiment 4:

[0108] This embodiment provides a biaxial stretching machine for capacitor film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0109] The side support assembly includes:

[0110] The side connector 17 is rotatably matched with the end rotation groove of the end support assembly;

[0111] A side extension rod 18, one end of which is integrally formed on a side of the side connector 17 away from the end support assembly, and the other end of which is hingedly connected to the external drive assembly;

[0112] Two side supports are respectively arranged on both sides of the end support assembly, and one end is rotationally fixed to the frame 1, and the other end supports the end positioning block 11 in the end support assembly for rotational cooperation;

[0113] The end positioning block 11 in the end support assembly is elastically retained on the end positioning block 11 under the support of the side support member.

[0114] In this embodiment, the side connecting head 17 is in the shape of a ball head, and the side extension rod 18 can rotate and swing to a certain extent relative to the end rotating groove under the support of the side connecting head 17; because the side extension rod 18 is hingedly connected to the external driving assembly, the side extension rod 18 can be pressed down or pulled up under the drive of the external driving assembly, and in the process of pressing down or pulling up the side extension rod 18, the end positioning block 11 in the end support assembly will be driven to slide relative to the limit groove 10; and the set side support member can provide good support for the end positioning block 11, thereby providing good elastic support for the longitudinal stretching roller 6 in the process of the distribution diameter of several longitudinal stretching rollers 6 becoming larger, so that the longitudinal stretching roller 6 is easily reset when the distribution diameter of several longitudinal stretching rollers 6 becomes smaller; at the same time, when the distribution diameter of several longitudinal stretching rollers 6 becomes larger and the film is longitudinally stretched, the stable operation of the longitudinal stretching roller 6 is ensured, thereby reducing damage to the film.

[0115] Embodiment 5:

[0116] This embodiment provides a biaxial stretching machine for capacitor film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0117] The side supports include:

[0118] Two side connecting plates 19 are symmetrically arranged with one of them being rotatably connected to the frame 1 by bolts, and the other being rotatably connected to the end positioning block 11 of the end support assembly by bolts;

[0119] Two side connection mechanisms are respectively arranged on the inner sides of the two side connection plates 19, and the two side connection mechanisms are arranged opposite to each other;

[0120] A side supporting mechanism, arranged between the two side connecting mechanisms;

[0121] The side connection mechanism includes:

[0122] The side push plate 20 abuts against the side connecting plate 19;

[0123] A side positioning ring 21, one end of which abuts against the end support mechanism, and the other end of which abuts against the side push plate 20;

[0124] A plurality of side push positioning rods 22 are evenly distributed and one end of the rods 22 is slidably matched with the side support mechanism, and the other end of the rods 22 is slidably matched with the side connecting plate 19 and the side push plate 20 .

[0125] In this embodiment, a hinge connection block for connection is formed on the side connecting plate 19, and the side connecting plate 19 is connected to the frame 1 or the end support assembly through the hinge connection block; and the setting of the side support mechanism can play a good telescopic support and elastic limiting effect between the two side connecting plates 19; the side connecting mechanism can play a good connection between the side support mechanism and the side connecting plate 19; wherein the side pushing plate 20 of the side connecting mechanism can be easily connected to the side connecting plate 19, and the side positioning ring 21 can be a rubber ring or spring with elastic expansion and contraction; and the side pushing positioning rod 22 can ensure the stability of the connection between the side pushing plate 20 and the side supporting mechanism, and under the action of the side positioning ring 21 and the side pushing positioning rod 22, the side connecting mechanism has a certain elastic expansion and contraction ability, thereby ensuring the stability of the overall structure of the side support.

[0126] Embodiment 6:

[0127] This embodiment provides a biaxial stretching machine for capacitor film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0128] The side support mechanism includes:

[0129] Two side support plates 23 are symmetrically arranged and respectively abut against the side positioning ring 21 on the side where they are located, and a through hole is formed in the middle of the side support plate 23;

[0130] A side support spring 24 is disposed between the two side support plates 23 and has two ends respectively abutting against the side support plates 23;

[0131] A plurality of side support positioning rods 25 are evenly distributed between the two side support plates 23, and both ends of the rods are respectively slidably matched with the side support plates 23 on the sides where the rods are located;

[0132] The side support rod 26 is disposed inside the side support spring 24 and has two ends extending into through holes on the side support plate 23 respectively.

[0133] In this embodiment, the side support plate 23 is used to support the side support spring 24 and can be elastically connected to the side connection mechanism, and the side support spring 24 ensures that the side support mechanism has good elastic compression and reset effects, thereby providing good support for the end positioning block 11 when it moves; and the side support positioning rod 25 can ensure that there is no offset and rotation between the two side support plates 23, and ensure the stability of the compression and reset of the side support mechanism; the side support rod 26 is arranged in the through hole, so as to further limit and guide the side support plate 23.

[0134] Embodiment 7:

[0135] This embodiment provides a biaxial stretching machine for capacitor film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0136] The external drive components include:

[0137] An outer support frame 36 is arranged on the outer side of the frame 1;

[0138] The external driver 27 is arranged on the external support frame 36 and the driving end faces the frame 1;

[0139] An external connection seat 37 is disposed on the driving end of the external driver 27, and one end of the side receiving assembly is connected to the external connection seat 37;

[0140] A plurality of external telescopic positioning mechanisms are evenly distributed, and one end is connected to the external connecting seat 37 , and the other end is connected to the frame 1 .

[0141] In this embodiment, the outer support frame 36 can be fixed to the outside of the frame 1 by fasteners such as bolts, and the external driver 27 can be a digital hydraulic cylinder, so that the end support block 8 can accurately control the distance that the longitudinal stretching roller 6 moves to control the stretching amplitude of the film; and the external connecting seat 37 is used to connect with the side supporting assembly, and the side supporting assembly is driven to operate by the external connecting seat 37, so as to realize the displacement control of the end positioning block 11; and the setting of the telescopic positioning mechanism ensures that the external connecting seat 37 and the frame 1 can have good telescopic and reset functions, and can prevent the external connecting seat 37 from being cheap, and the external driver 27 drives the external connecting seat 37 to move closer to the frame 1 or away from the frame 1, and then the external connecting seat 37 drives the side extension rod 18 to press down or pull up, and finally the side extension rod 18 drives the end support block 8 to reciprocate along the length direction of the positioning groove 7, so as to achieve the enlargement or reduction of the distribution diameter of several circumferentially distributed longitudinal stretching rollers 6, thereby realizing the longitudinal stretching or loosening of the film.

[0142] Embodiment 8:

[0143] This embodiment provides a biaxial stretching machine for capacitor film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0144] The external connection base 37 comprises:

[0145] An outer support plate fixedly connected to the driving end of the outer driver 27;

[0146] An inner support plate fixedly connected to one end of a plurality of outer telescopic positioning mechanisms;

[0147] A plurality of outer ribs are arranged between the outer support plate and the inner support plate, and each outer rib is formed by two ribs with isosceles trapezoidal cross sections distributed at right angles.

[0148] In this embodiment, the outer support plate can be better connected to the outer driver 27, and the inner support plate is used to connect to the outer telescopic positioning mechanism. At the same time, the outer rib plate can play a good supporting role between the outer support plate and the inner support plate, and the outer rib plate can improve the overall structural strength of the outer connecting seat 37; and the side extension rod

[0149] Hingedly connected to the inner support plate of the outer drive assembly.

[0150] Embodiment 9:

[0151] This embodiment provides a biaxial stretching machine for capacitor film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0152] The external telescopic positioning mechanism includes:

[0153] The inner telescopic sleeve 28 has one end fixed to the frame 1 by bolts or other fasteners, and the other end is arranged toward the inner support plate of the outer connecting seat 37;

[0154] The outer telescopic cylinder 29 has one end fixed to the inner support plate of the outer connecting seat 37 by means of bolts or other fasteners, and the other end slidingly cooperates with the outer wall of the inner telescopic sleeve 28;

[0155] An inner floating chamber 30 , coaxially formed within the inner telescopic sleeve 28 ;

[0156] The outer floating chamber 31 is coaxially formed in the inner telescopic sleeve 28 and is located outside the inner floating chamber 30, and a receiving hole communicating with the inner floating chamber 30 is formed on the inner floating chamber 30;

[0157] The telescopic rod 32 is coaxially arranged on the inner side of the outer telescopic cylinder 29, and one end of the telescopic rod 32 is fixedly connected to the inner support plate of the outer connecting seat 37, and the other end of the telescopic rod 32 extends into the inner floating chamber 30 and is formed with a floating plug that is sealed and slidably matched with the inner floating chamber 30;

[0158] The outer floating ring 33 is disposed in the outer floating chamber 31 and slidably cooperates with the outer floating chamber 31;

[0159] The inner telescopic floating spring 34 is arranged in the outer floating chamber 31 and has one end abutting against the end of the outer floating chamber 31 away from the frame 1, and the other end abutting against the outer floating ring 33;

[0160] The outer telescopic floating spring 35 is sleeved outside the telescopic rod 32 and has one end abutting against the bottom of the outer telescopic cylinder 29 and the other end abutting against the end surface of the inner telescopic sleeve 28 .

[0161] In this embodiment, the outer telescopic cylinder 29 is a cylindrical structure with one end being closed, and the closed end of the outer telescopic cylinder 29 is connected to the inner support plate; the inner telescopic sleeve 28 is a closed cylindrical structure with a rotary cover, the rotary cover is arranged in the direction toward the outer telescopic cylinder 29, and the end surface of the rotary cover extends into the inner telescopic sleeve 28 to form a chamber wall, and the inner floating chamber 30 is formed on the inner side of the chamber wall; the outer floating chamber 31 is formed between the chamber wall and the inner wall of the inner telescopic sleeve 28, and the two ends are closed by the bottom of the inner telescopic cylinder and the rotary cover ; and a buffer hole is formed on the chamber wall at a position close to the bottom of the inner telescopic sleeve 28, and the outer floating chamber 31 and the screw cover end of the inner telescopic floating spring 34 are abutted against each other; when the outer telescopic positioning mechanism is in normal state and is not compressed, the floating plug of the telescopic rod 32 is located on the side of the inner floating chamber 30 close to the screw cover, and the outer floating ring 33 is located on the side of the inner telescopic sleeve 28 away from the screw cover under the support of the inner telescopic floating spring 34, and the outer floating chamber 31 and the inner floating chamber 30 are filled with buffer fillers, such as high-pressure air or buffer oil.

[0162] The inner telescopic sleeve 28 can facilitate the connection between the outer telescopic positioning mechanism and the frame 1; the setting of the outer telescopic cylinder 29 can facilitate the connection between the outer telescopic positioning mechanism and the inner support plate, and the outer telescopic cylinder 29 and the inner telescopic sleeve 28 are slidably matched so that the outer connecting seat 37 can be driven to move when the outer driver 27 is driven; the outer telescopic rod 32 is used to cooperate with the inner floating chamber 30. When the outer driver 27 drives the outer connecting seat 37 to move toward the frame 1, the telescopic rod 32 moves toward the side of the inner floating chamber 30 close to the frame 1, and at the same time, the outer telescopic cylinder 29 also moves toward the end of the inner telescopic sleeve 28. At this time, The outer telescopic floating spring 35 is compressed, and the floating plug at the end of the telescopic rod 32 will squeeze the buffer filler in the inner floating chamber 30, and the buffer filler enters the outer floating chamber 31 through the buffer hole. The buffer filler then squeezes the outer floating ring 33 to drive the outer floating ring 33 to move in the direction of the screw cap, thereby compressing the outer telescopic floating spring 35; and then accumulates the force for resetting the external connecting seat 37, thereby improving the efficiency and effect of the external driver 27 driving the external connecting seat 37 to reset, and ensuring the stability of the reset of the longitudinal stretching roller 6, thereby avoiding the instantaneous relaxation of the film that has been longitudinally stretched and causing the film to overlap.

[0163] Embodiment 10:

[0164] This embodiment provides a stretching control method for a biaxial stretching machine of a capacitor film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0165] The following steps are involved:

[0166] Step 1: Place the thick film roll to be stretched on the unwinding roller 2, and fix one end of the thick film roll on the winding roller 3 after passing through the heating roller 4, the receiving roller component 5, the longitudinal stretching component, the positioning roller component 38 and the transverse stretching component 39 in sequence;

[0167] Step 2: Control the longitudinal stretching component to longitudinally stretch the thick film at the location;

[0168] Step 3: Control the winding roller 3 to move the thick film that has been longitudinally stretched by the longitudinal stretching component to the transverse stretching component 39, and at the same time move the thick film that has not been transversely stretched to the longitudinal stretching component;

[0169] Step 4: Control the transverse stretching component 39 to stretch the thick film at the location transversely, and control the longitudinal stretching component to stretch the thick film at the location longitudinally;

[0170] Step 5: Repeat steps 3 and 4 until all the thick film on the unwinding roller 2 is unwound.

[0171] In this embodiment, in step 3, during the resetting process of the longitudinal stretching roller 6 of the longitudinal stretching component, the film on the longitudinal stretching component is stretched toward the transverse stretching component 39 through the winding roller 3; thereby, it can also prevent the film from being overlapped or offset due to the instantaneous relaxation of the film after longitudinal stretching; wherein the stretching amplitude of the film by the longitudinal stretching component and the transverse stretching component 39 is proportional to the temperature of the film passing thereon, when the film temperature is high, the transverse stretching and longitudinal stretching amplitudes are large, and when the temperature is low, the stretching amplitudes are small, and the temperature is adjusted by the controller according to the film stretching; thereby, it can be applied to the stretching of films of different specifications. And through the above control method, the rolled film can be better stretched continuously, thereby improving the continuity of film stretching. wherein the length of the film on the positioning roller component 38, which has passed the longitudinal stretching component and has not entered the transverse stretching component 39, is 1.5-2 times the length of the film that can enter the transverse stretching component 39.

[0172] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A biaxial stretching machine for capacitor film, comprising: Rack(1); An unwinding roller (2) is arranged at one end of the frame (1); A winding roller (3) is arranged at the other end of the frame (1); A stretching device, arranged in the frame (1) and between the winding roller (3) and the unwinding roller (2), comprising a heating roller (4), a receiving roller component (5), a longitudinal stretching component, a positioning roller component (38) and a transverse stretching component (39); It is characterized in that The longitudinal stretching component comprises: A plurality of longitudinal stretching rollers (6) are provided and distributed circumferentially within the frame (1); A plurality of end support assemblies are respectively arranged at both ends of each longitudinal stretching roller (6), and a positioning groove (7) is formed on the frame (1) for the ends of the end support assemblies to extend out of the frame (1); A plurality of side receiving assemblies, respectively arranged on a side of each end supporting assembly away from the longitudinal stretching roller (6); Two external drive assemblies are respectively arranged on the outside of two sides of the frame (1) and drive the side receiving assembly on the side thereof to drive the end support assembly on the side thereof to reciprocate along the length direction of the positioning groove (7); The end support assembly comprises: An end support block (8) having a placement groove formed thereon, and one end of the longitudinal stretching roller (6) is rotatably fixed to the placement groove via a bearing; An end extension block, formed at an end of the end support block (8) away from the placement groove and integrally formed with the end support block; An end limit frame (9) is arranged on the outside of the frame (1) and surrounds the positioning groove (7), and is provided with a limit groove (10) extending along the length direction of the positioning groove (7) on its inner side; An end positioning block (11) is slidably disposed in the end limiting frame (9), and one side of the end positioning block is integrally formed with the end extension block; A plurality of end floating components are arranged on the end positioning block (11) and are limitedly matched with the limit grooves (10) of the end limit frame (9); The side support assembly comprises: A side connector (17) rotatably engaged with the end support assembly; A side extension rod (18), one end of which is integrally formed on a side of the side connector (17) away from the end support assembly, and the other end of which is hingedly connected to the external drive assembly; Two side support members are respectively arranged on both sides of the end support assembly, one end of which is rotatably fixed to the frame (1) and the other end of which supports the end support assembly; The side support member comprises: Two side connecting plates (19) are symmetrically arranged with one of them being connected to the frame (1) and the other being connected to the end support assembly; Two side connection mechanisms are respectively arranged on the inner sides of the two side connection plates (19), and the two side connection mechanisms are arranged opposite to each other; A side supporting mechanism, arranged between the two side connecting mechanisms; The side connection mechanism includes: A side push plate (20) abuts against the side connecting plate (19); A side positioning ring (21), one end of which abuts against the end support mechanism, and the other end of which abuts against the side push plate (20); A plurality of side push positioning rods (22) are evenly distributed and one end of which is slidably engaged with the side support mechanism and the other end of which is slidably engaged with the side connecting plate (19) and the side push plate (20); The side support mechanism comprises: Two side support plates (23) are symmetrically arranged and respectively abut against the side positioning ring (21) on the side where they are located, and a through hole is formed in the middle of the side support plate (23); A side support spring (24) is arranged between the two side support plates (23) and has two ends respectively abutting against the side support plates (23); A plurality of side support positioning rods (25) are evenly distributed between the two side support plates (23), and both ends of the rods are respectively slidably matched with the side support plates (23) on the sides where they are located; The side support rod (26) is arranged inside the side support spring (24) and has two ends extending into through holes on the side support plate (23) respectively.

2. The biaxial stretching machine for capacitor film according to claim 1, characterized in that: The external drive assembly comprises: An outer support frame (36) is arranged on the outer side of the frame (1); An external driver (27) is disposed on the external support frame (36) with the driving end facing the frame (1); An external connection seat (37) is arranged on a driving end of the external driver (27), and one end of the side bearing assembly is rotatably connected to the external connection seat (37); A plurality of external telescopic positioning mechanisms are evenly distributed, one end of which is connected to the external connecting seat (37) and the other end of which is connected to the frame (1).

3. The biaxial stretching machine for capacitor film according to claim 2, characterized in that: The external telescopic positioning mechanism comprises: An inner telescopic sleeve (28), one end of which is fixed to the frame (1) and the other end of which is arranged toward the outer connecting seat; An outer telescopic cylinder (29), one end of which is fixed to the outer connecting seat, and the other end of which is slidably engaged with the outer wall of the inner telescopic sleeve (28); An inner floating chamber (30) coaxially formed within the inner telescopic sleeve (28); An outer floating chamber (31) is coaxially formed inside the inner telescopic sleeve (28) and is located outside the inner floating chamber (30), and a receiving hole communicating with the inner floating chamber (30) is formed on the inner floating chamber (30); A telescopic rod (32) coaxially arranged on the inner side of the outer telescopic cylinder (29); An outer floating ring (33) is disposed in the outer floating chamber (31) and is slidably matched with the outer floating chamber (31); An inner telescopic floating spring (34) is arranged in the outer floating chamber (31); The outer telescopic floating spring (35) is sleeved outside the telescopic rod (32).

4. A biaxial stretching machine for capacitor film according to any one of claims 1 to 3, characterized in that: The stretching control method of the biaxial stretching machine comprises the following steps: Step 1: placing a thick film roll to be stretched on an unwinding roller (2), and fixing one end of the thick film roll on a winding roller (3) after passing through a heating roller (4), a receiving roller component (5), a longitudinal stretching component, a positioning roller component (38), and a transverse stretching component (39) in sequence; Step 2: Control the longitudinal stretching component to longitudinally stretch the thick film at the location; Step 3: Control the winding roller (3) to move the thick film that has been longitudinally stretched by the longitudinal stretching component to the transverse stretching component (39), and at the same time move the thick film that has not been transversely stretched to the longitudinal stretching component; Step 4: controlling the transverse stretching component (39) to stretch the thick film at the location transversely, and controlling the longitudinal stretching component to stretch the thick film at the location longitudinally; Step 5: Repeat steps 3 and 4 until all the thick film on the unwinding roller (2) is unwound.

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