Preparation method of transformer

Abstract

The transformer comprises an iron core, a primary winding and a secondary winding, the primary winding and the secondary winding are wound on the iron core, the primary winding and the secondary winding are both formed by winding foil type windings, the foil type windings comprise multiple layers of stacked chaff bodies in the same insulating sleeve, and the adjacent chaff bodies are in an insulating state; the preparation process of the foil type winding comprises the following steps: cutting a metal foil subjected to insulation treatment into metal chaff and rolling the metal chaff into a single-layer chaff roll; overlapping the metal chaff of the plurality of single-layer chaff rolls and rolling the metal chaff into a multi-layer chaff roll; multiple layers of chaff of the multiple layers of chaff rolls are fixed and sleeved with insulating tubes; the multiple layers of chaff sleeved with the insulating tube are subjected to thermal shrinkage and then rolled; the preparation method of the transformer comprises the step of winding the foil type winding on the iron core. The foil type winding is small in thickness, the power density of the transformer is large, arrangement is tighter in the winding process, winding is avoided, machining is easier and more convenient, and the production efficiency is greatly improved through the preparation method.

Description

Technical Field

[0001] The invention belongs to the technical field of windings, and in particular, relates to a method for preparing a transformer. Background Art

[0002] The existing transformer winding generally winds the wires on the iron core. During the winding process, the wires are easily entangled and the wires are not tight enough.

[0003] Therefore, foil windings appeared. The metal foil groups produced by traditional methods are generally made of multiple layers of metal foils placed on top of each other and then cut into strips. This overlapping placement can easily cause bending marks inside the multiple layers of metal foil. When cutting, the edges of the metal foil strips can easily deform due to their large thickness. As a winding, short circuits can easily occur when the transformer is running.

[0004] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The invention provides a method for preparing a transformer to solve the technical problems that the existing foil windings are easily bent and overlapped and easily short-circuited because they are overlapped and then cut.

[0006] In order to achieve the above invention / design purpose, the present invention adopts the following technical solutions: A method for preparing a transformer, the transformer comprising an iron core and a primary winding and a secondary winding wound on the iron core, the primary winding and the secondary winding are both wound by foil windings, the foil windings comprising multiple layers of stacked foil strips in the same insulating sleeve, adjacent foil strips are insulated; the preparation process of the foil winding is: Cutting the insulating metal foil into metal foil strips and rolling them into single-layer foil strip rolls; stacking and rolling up the metal foil strips of a plurality of single-layer foil strip rolls into a multi-layer foil strip roll; Fix the multi-layer foil strips of the multi-layer foil strip roll and put them into the insulating tube; Heat shrink the multi-layer foil strips of the insulating tube and then roll them up; The transformer is prepared by winding the foil winding on the iron core.

[0007] According to the transformer preparation method as described above, the fixing clamp for fixing the multi-layer foil strip includes a first clamping portion and a second clamping portion arranged at a certain angle, the first clamping portion and the second clamping portion are connected by a connecting portion, and the free end of the fixing clamp has an auxiliary clamping portion arranged opposite to each other. After the multi-layer foil strip enters the fixing clamp, the first clamping portion and the second clamping portion are clamped, and the auxiliary clamping portion and the connecting portion are clamped.

[0008] In the transformer preparation method as described above, the first clamping portion and the second clamping portion are first clamped by two transverse pressure rollers, and then the auxiliary clamping portion and the connecting portion are clamped by two longitudinal pressure rollers.

[0009] In the transformer preparation method as described above, the method of fitting the fixed multi-layer foil strips into the insulating tube is as follows: a magnetic attraction device outside the insulating tube is moved along the direction of the insulating tube to attract the multi-layer foil strips inside the insulating tube to move inside the insulating tube.

[0010] In the transformer manufacturing method described above, the fixed multi-layer foil strips are mounted on the insulating tube by a tube-threading device, and the tube-threading device comprises: A frame, wherein an insulating tube positioning portion is provided on the frame, and the insulating tube positioning portion is used to position the insulating tube; A conveyor belt is arranged along the direction of the insulating tube, and a magnetic attraction device is provided on the conveyor belt.

[0011] In the transformer manufacturing method as described above, the insulating tube positioning portion is an insulating tube positioning groove spirally arranged on the frame; the tube insertion device comprises: A fan, used for blowing air into the insulating tube; A detachable shell is provided with an air suction device for sucking out the air in the shell.

[0012] In the transformer preparation method as described above, the detachable housing is provided with an insulating tube positioning groove, an air intake port is provided at a position corresponding to the insulating tube positioning groove, and the air intake port is connected to the air intake device.

[0013] In the transformer preparation method as described above, the conveyor belt is located in the frame, a conveyor roller is provided in the frame, and the conveyor belt circulates on the conveyor roller.

[0014] According to the transformer preparation method as described above, after heat shrinkage, the transformer is rolled around by a rolling roller and tested by a spark tester before being rolled up.

[0015] In the method for preparing the transformer as described above, the foil winding is wound on the iron core by a winding device and then an insulating tape is wound, wherein the winding device comprises: a rotating roller for introducing the foil winding; A clamping mechanism, used for clamping the iron core; A rotation and translation mechanism, used to drive the clamping mechanism to rotate and translate; A positioning mechanism for positioning the foil winding or insulating tape; Vacuum suction cup, used to absorb insulating tape; A transfer mechanism, wherein the clamping mechanism, the rotation and translation mechanism, and the positioning mechanism are located on the transfer mechanism; A cutting tool, used for cutting the foil winding or the insulating tape; The transfer mechanism transfers the clamping mechanism, the rotating and translating mechanism, and the positioning mechanism to the rotating roller, the clamping mechanism clamps the iron core, the rotating roller introduces the foil winding, the positioning mechanism positions the foil winding on the iron core, the rotating and translating mechanism operates to wind the foil winding on the iron core, and the cutting tool cuts off the foil winding after the winding is completed; the transfer mechanism transfers the clamping mechanism, the rotating and translating mechanism, and the positioning mechanism to the vacuum suction cup that absorbs the insulating tape, the rotating and translating mechanism operates to wind the insulating tape onto the iron core, the positioning mechanism positions the insulating tape, and the cutting tool cuts off the insulating tape after the winding is completed.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: The invention discloses a method for preparing a transformer, wherein the transformer comprises an iron core and a primary winding and a secondary winding wound on the iron core, wherein the primary winding and the secondary winding are both wound by a foil winding, wherein the foil winding comprises a multi-layer stacked foil strip in the same insulating sleeve, and adjacent foil strips are insulated; the preparation process of the foil winding comprises: cutting the metal foil treated with insulation into metal foil strips and rolling them into a single-layer foil strip roll; stacking the metal foil strips of a plurality of single-layer foil strip rolls and rolling them into a multi-layer foil strip roll; fixing the multi-layer foil strips of the multi-layer foil strip roll and sheathing an insulating tube; and rolling the multi-layer foil strips sheathed in the insulating tube after heat shrinking; and the preparation method of the transformer comprises: winding the foil winding on the iron core. The foil winding of the invention has a small thickness, a large transformer power density, a tighter arrangement during the winding process, no winding, and a simpler processing, and the preparation method greatly improves production efficiency. The foil winding of the present invention is cut first and then stacked, which can avoid stacking marks and edge deformation, and will not cause short circuit, so that the foil winding is more reliable and firm when the transformer is running.

[0017] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Schematic diagram of a transformer according to a specific embodiment of the present invention.

[0020] Figure 2 It is an exploded view of the winding of a specific embodiment of the present invention.

[0021] Figure 3 It is a cross-sectional schematic diagram of a foil winding according to a specific embodiment of the present invention.

[0022] Figure 4 Schematic diagram of a linear winding transformer according to a specific embodiment of the present invention.

[0023] Figure 5 It is a schematic diagram of a chevron-shaped winding transformer according to a specific embodiment of the present invention.

[0024] Figure 6 It is a schematic diagram of the metal foil cutting and rolling process according to a specific embodiment of the present invention.

[0025] Figure 7-8 It is a schematic diagram of the stacking process of multiple layers of metal foil strips according to a specific embodiment of the present invention.

[0026] Fig. 9 It is a schematic diagram of the process of fixing a multi-layer metal foil strip onto an insulating sleeve in a specific embodiment of the present invention.

[0027] Fig.10 It is a schematic diagram of a metal foil uncoiler according to a specific embodiment of the present invention.

[0028] Fig.11 Schematic diagram of a metal foil cutting machine according to a specific embodiment of the present invention.

[0029] Fig.12 It is a schematic diagram of a metal foil strip winding machine according to a specific embodiment of the present invention.

[0030] Fig.13 Schematic diagram of a fixing clip according to a specific embodiment of the present invention.

[0031] Fig.14 It is a schematic diagram of a fixing device according to a specific embodiment of the present invention.

[0032] Fig.15 It is a schematic diagram of a state in which the outer shell of the pipe penetration device of a specific embodiment of the present invention is opened.

[0033] Fig.16It is a cross-sectional schematic diagram of a pipe penetration device according to a specific embodiment of the present invention.

[0034] Fig.17 It is a schematic diagram of a conveyor belt, conveyor roller and magnetic attraction device according to a specific embodiment of the present invention.

[0035] Fig.18 It is a schematic diagram of the transformer winding process according to a specific embodiment of the present invention.

[0036] Fig.19 It is a schematic diagram of a winding device according to a specific embodiment of the present invention.

[0037] 1. Insulation sleeve; 2. Foil strip; 10. Metal foil unwinder; 101. Metal foil roll bracket; 102. Fixed frame; 103. Motor and transmission; 104. Metal foil roll clamping device; 20. Metal foil cutting machine; 201. Pulling roller; 202. Cutting roller; 203. Cutting roller; 204. Distance adjustment device; 205. Roller cooling device; 206. Waste recovery device; 30. Metal foil strip winder; 40. Metal foil strip unwinder; 50. Second metal foil strip winder; 60. Fixed clamp device; 601. Fixed clamp; 6011. First clamping part; 6012. Second clamping part; 6013. Connecting part ; 6014, auxiliary clamping part; 602, transverse pressure roller; 603, longitudinal pressure roller; 70, pipe threading device; 701, frame; 7011, insulating tube positioning part; 702, conveyor belt; 7021, magnetic suction device; 7022, conveyor roller; 703, shell; 7031, insulating tube positioning groove; 7032, suction port; 80, heat shrink device; 90, winding winder; 901, rotating roller; 902, clamping mechanism; 903, rotating and translating mechanism; 904, positioning mechanism; 905, vacuum suction cup; 906, transfer mechanism; 907, cutting tool; 908, insulating tape roller. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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, should not be understood as a limitation on the present invention.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the implementation method, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0042] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0043] like Figure 1-Figure 3 As shown, the foil winding is to use a metal strip foil group instead of a wire to wind the iron core of the transformer. Each phase winding is wound with only one group of metal strip foil groups, which includes a number of parallel metal strip foils wrapped by an insulating layer. The material of the foil can be copper, aluminum or other highly conductive materials; the insulating layer of the parallel foil group can be one of the high-temperature resistant ultra-thin insulating materials such as polyvinyl chloride, cross-linked polyethylene, polypropylene, asbestos and fluorine materials, or one of the insulating paints such as phenolic resin paint, epoxy resin paint, polyurethane paint, acrylate, etc.; the advantage of this is that the winding thickness is small and the transformer power density is large; the advantage of the foil winding over the wire winding is that the foil winding is arranged more closely during the winding process.

[0044] like Figure 3 As shown, the foil winding includes multiple layers of stacked foil strips 2 in the same insulating sleeve 1 , and adjacent foil strips 2 are insulated from each other, that is, there is an insulating layer between adjacent foil strips 2 .

[0045] Set in Figure 4 In the example, the transformer is a linear winding transformer.

[0046] exist Figure 5 In the example, the transformer is a chevron winding transformer.

[0047] The transformer includes an iron core and a primary winding and a secondary winding wound on the iron core. The primary winding and the secondary winding are both wound by foil windings. The foil windings include multiple layers of stacked foil strips in the same insulating sleeve, and adjacent foil strips are insulated. The preparation process of the foil winding is as follows: Cutting the insulating metal foil into metal foil strips and rolling them into single-layer foil strip rolls; stacking and rolling up the metal foil strips of a plurality of single-layer foil strip rolls into a multi-layer foil strip roll; Fix the multi-layer foil strips of the multi-layer foil strip roll and put them into the insulating tube; Heat shrink the multi-layer foil strips of the insulating tube and then roll them up; The transformer is prepared by winding a foil winding on an iron core.

[0048] The following is a description of the preparation method of the foil winding: A method for preparing a foil winding, the method comprising the following steps: Cutting the insulating metal foil into metal foil strips and rolling them into single-layer foil strip rolls; stacking and rolling up the metal foil strips of a plurality of single-layer foil strip rolls into a multi-layer foil strip roll; Fix the multi-layer foil strips of the multi-layer foil strip roll and put them into the insulating tube; The multi-layer foil strips of the insulating tube are heat-shrunk and then rolled up.

[0049] Foil windings can be processed in batches. The process flow for batch processing of foil windings is to first cut the insulated metal foil into strips, then stack multiple metal foil strips into groups, and finally put them into insulating tubes for heat shrinking and rolling.

[0050] Specifically, the process includes the following: 1. Metal foil cutting and winding process: The metal foil sheet after insulation treatment is sent to the metal foil cutting machine 20 through the metal foil unwinding machine 10 to be cut into metal foil strips 2, which are wound by the metal foil strip winding machine 30, and the remaining waste is recycled. Figure 6 The example metal foil strip winder 30 in the embodiment is a winding machine with four rows arranged horizontally and ten columns arranged vertically; Figure 7 The second metal foil unwinder 40 of the example is arranged in ten rows horizontally and two columns arranged up and down, and the second metal foil winder 50 is arranged in one row horizontally and two columns arranged up and down; Figure 8 The third metal foil unwinder of the example is arranged in two rows horizontally and in one column vertically, and the third metal foil winder is arranged in one row and one column.

[0051] In some embodiments, a 52m long, 50mm wide, 0.1mm thick metal foil that has been electroplated and insulated is unrolled by a metal foil unwinder 10, sent to a metal foil cutter 20 and cut into 20 metal foil strips that are 52m long, 2mm wide, and 0.1mm thick, and then wound up by a metal foil strip winder 30, and excess metal foil waste is recycled.

[0052] The metal foil roll is placed on the bracket of the metal foil unwinding machine 10, and is unwound at a uniform speed by the metal foil unwinding machine 10; Fig.10 As shown, the metal foil uncoiler 10 includes a metal foil roll bracket 101, a fixed frame 102, a motor and a transmission 103, a metal foil roll clamping device 104 and a control box; a locking mechanism is installed in the metal foil roll clamping device 104, and when the axis of the locking mechanism is rotated, the outer side of the shaft cylinder can be stretched open, so that the metal foil roll bracket 101 is fixed on the shaft cylinder.

[0053] The metal foil unrolled by the metal foil unwinder 10 enters the traction roller 201 of the metal foil cutting machine 20, and the traction roller 201 adjusts the angle of the metal foil sheet, and then the metal foil sheet is pulled to the cutting roller 202, and then cut to a width of 40 mm by the cutting roller 202. The excess metal foil waste is rolled up by the waste recovery device; and the 40 mm metal foil entering the cutting roller 203 is cut into 20 2 mm wide metal foil strips by the cutting roller 203; Fig.11 As shown, the metal foil cutting machine 20 includes a distance adjusting device 204, a roller cooling device 205, a pulling roller 201, a trimming roller 202, a cutting roller 203, a waste recycling device 206, a lubrication device, a motor and a gearbox, and a control box.

[0054] like Fig.12 As shown, the cut metal foil strips are transmitted to the metal foil strip winding machine 30, which is composed of 20 metal foil strip winding devices, 4 sets of motors and transmissions, a frame, etc.; the 20 metal foil strip winding devices respectively wind up 20 metal foil strips transmitted by the metal foil cutting machine; a knob is installed in the middle of the metal foil strip winding device, and the outer ring can be expanded to fix the metal foil roll bracket by rotating the knob with a four-corner wrench.

[0055] 2. Metal foil stacking process: Multiple rolled foil strips are placed on the metal foil strip unwinder 40 to align the metal foil strip winding devices in the same row. The metal foil strips arranged up and down are stacked and rolled into a multi-layer foil strip roll by the second metal foil strip winding machine 50.

[0056] Figure 7 In the example, 10 rows of single-layer metal foil strip rolls arranged vertically form a group, and 2 groups are arranged horizontally. 20 groups of single-layer metal foil strip rolls are placed on the metal foil strip unwinder 40 and are rolled into 2 groups by the second metal foil strip winder 50, each group has 10 layers of foil strips.

[0057] Figure 8 In the example, two rows of single-layer metal foil strips arranged up and down form a group, and the two groups of single-layer metal foil strips are placed on a metal foil strip unwinder and are wound into a group by a metal foil strip winder. The group has 20 layers of foil strips.

[0058] Align the metal foil strip winding devices of the metal foil uncoiler and the metal foil winder one by one, start the motors of the uncoiler and the winder at the same time, and roll the shaft to make the metal foil strips be rolled into 2 groups of 20 strips. The metal foil winder is composed of 2 side-by-side metal foil strip winding devices, a group of motors and transmissions, a control system and a frame, etc.; when in working state, the speed of the winding device of the metal foil uncoiler decreases from top to bottom, and the metal foil rolls of the metal foil uncoiler 2 and the winder 2 must be completely aligned; the structure and function of the metal foil strip winding device are the same as those of the metal foil strip uncoiler, the only difference is the direction of the motor, the motor rotates counterclockwise for unwinding, and the motor rotates clockwise for winding.

[0059] After the metal foil winder winds up two groups of metal foil strips, the two groups of metal foil rolls of the metal foil winder are taken down and placed in the center of the unwinding device shaft cylinder of the metal foil unwinder, and the knob of the rewinding device is turned with a wrench to align and lock the metal foil rolls of the metal foil winder; at the same time, the motors of the unwinder and the rewinder are started, the shaft cylinder rolls, and the metal foil strips are rolled from two groups into one group; the metal foil unwinder is composed of two parallel metal foil strip unwinding devices, a group of motors and transmissions, a control system and a frame, etc.; the metal foil winder is composed of a metal foil strip winding device, a group of motors and transmissions, a frame, etc.; when in working state, the speed of the rewinding device of the metal foil unwinder is reduced from top to bottom, and the metal foil rolls of the metal foil unwinder and the metal foil winder must be completely aligned; 3. Metal foil insulation tube assembly process: The rolled multi-layer metal foil strip is fixed with a fixing clip and then enters the tube-threading device 70. The magnet attracts the multi-layer metal foil strip fixed by the fixing clip to move in the insulating tube, so that the insulating tube completely wraps the metal foil strip. Then, the multi-layer metal foil strip is sent to the constant temperature heat shrinking device 80 for heat shrinkage, and finally sent to the winding coiling machine 90. Fig. 9 shown.

[0060] After being unwound by the metal foil strip unwinder, the multi-layer metal foil strips enter the fixing clamp device 60. The metal foil group passing through the fixing device is fixed with fixing clamps every 1m, so that the metal strips in the metal foil group no longer move relative to each other. Then the metal foil group enters the insulating tube fixed by the suction cup in the tube threading device 70. The magnet attracts the metal foil group fixed by the fixing clamp to move toward the end of the insulating tube. After the 52m long metal foil group is completely covered with the 72m long insulating tube, it is sent to the constant temperature heat shrink device 80 for heat shrinkage, so that the insulating tube tightly wraps the metal foil group, and finally sent to the winding winder 90 for winding.

[0061] The multi-layer foil strips of the multi-layer foil strip roll are fixed at a specific interval.

[0062] like Fig.13 As shown, the fixing clip 601 for fixing the multi-layer foil strip comprises a first clamping portion 6011 and a second clamping portion 6012 arranged at a certain angle, the first clamping portion 6011 and the second clamping portion 6012 are connected by a connecting portion 6013, and the free end of the fixing clip has an auxiliary clamping portion 6014 arranged opposite to each other. The fixing clip 601 is made of metal.

[0063] After the multi-layer foil strip enters the fixing clamp 601 , the first clamping portion 6011 and the second clamping portion 6012 are clamped, and the auxiliary clamping portion 6014 and the connecting portion 6013 are clamped.

[0064] like Fig.14 As shown, the fixing device first clamps the first clamping portion 6011 and the second clamping portion 6012 through two transverse pressure rollers 602 , and then clamps the auxiliary clamping portion 6014 and the connecting portion 6013 through two longitudinal pressure rollers 603 .

[0065] The metal foil group enters the fixing device, and the magnetic plate under the conveyor belt attracts the fixing clamp 601. The metal foil group passes through the middle of the fixing clamp 601, and the transverse pressure roller 602 tightly fits the fixing clamp 601 to the metal foil group in the horizontal direction; when the metal foil group passes through the longitudinal pressure roller 603, the fixing clamp 601 will further tighten the metal foil group in the vertical direction.

[0066] The method for fitting the fixed multi-layer foil strips onto the insulating tube is as follows: a magnetic suction device outside the insulating tube is moved along the direction of the insulating tube to attract the multi-layer foil strips inside the insulating tube to move inside the insulating tube.

[0067] The fixed multi-layer foil strip is put into the insulating tube by the tube-threading device 70, such as Figure 15-17 As shown, the pipe-piercing device 70 includes: The frame 701 is provided with an insulating tube positioning portion 7011 for positioning the insulating tube. The insulating tube positioning portion 7011 is an insulating tube positioning groove spirally provided on the frame 701 .

[0068] The conveyor belt 702 is arranged along the direction of the insulating tube, and the conveyor belt 702 is also arranged in a spiral. A magnetic attraction device 7021 is arranged on the conveyor belt 702. The conveyor belt 702 is located in the frame 701, and a conveyor roller 7022 is arranged in the frame 701, and the conveyor belt 702 circulates on the conveyor roller 7022.

[0069] The fan is used to blow air into the insulating tube to expand the insulating tube.

[0070] The detachable shell 703 is provided with an air suction device for sucking out the air in the shell 703 .

[0071] An insulating tube positioning groove 7031 is provided on the detachable housing 703 , and an air intake port 7032 is provided at a position corresponding to the insulating tube positioning groove 7031 , and the air intake port 7032 is connected to the air intake device.

[0072] The tightened metal foil group enters the pipe-piercing device 70. An annular conveyor belt 702 is installed on the inner side of the frame 701 of the pipe-piercing device 70. A magnetic device 7021 is fixed on the annular conveyor belt 702. The magnetic device 7021 on the annular conveyor belt 702 drives the metal foil group to move along the insulating tube, so that the metal foil group penetrates the insulating tube fixed in the insulating tube positioning part 7011.

[0073] The pipe-piercing device 70 includes two side shells 703 and a plurality of vacuum suction ports 7032, an ultra-thin aluminum frame 701, a built-in conveyor belt 702, a motor, a controller and a transmission, etc. Before the pipe threading device starts working, it is necessary to first cut off a 72m long insulating pipe and manually place the insulating pipe in the insulating pipe positioning part 7011 of the frame 701. The insulating pipe is blown up by a fan so that the insulating pipe protrudes from the insulating pipe positioning part 7011. The shell 703 is closed and locked so that the protruding part of the insulating pipe is placed in the insulating pipe positioning groove 7031 in the shell 703 on both sides. The suction device of the shell 703 is started so that the frame 701 and the shell 703 are combined into a vacuum structure so that the insulating pipe fits seamlessly in the insulating pipe positioning groove 7031 of the shell 703. The insulating pipe positioning part 7011 in the aluminum frame 701 and the built-in conveyor belt 702 of the pipe threading device are both spiral-shaped. The built-in conveyor belt 702 is driven by two sets of conveyor rollers 7022. There are magnetic suction devices 7021 distributed on the conveyor belt 702 at intervals of 0.5m. The magnetic suction devices 7021 pull the metal foil group in the insulating pipe to move forward in a spiral motion. After passing through the insulating tube, the metal foil group is pulled by the rolling roller of the constant temperature heat shrink device 80 to the inner cavity for heating and shrinking; the constant temperature heat shrink device 80 includes a fan and a fan baffle, and two layers of upper and lower heaters. The constant temperature heat shrink device 80 is also equipped with a continuous constant temperature device and a temperature detection device, which can shrink the insulating tube entering the cavity of the heat shrink device 80 in time; a heat dissipation port is set on the shell of the constant temperature heat shrink device 80.

[0074] After heat shrinking, it is rolled up after being rolled around by a rolling roller and tested by a spark tester.

[0075] Since the distance from the tube threading device to the winding reeling device is too long, and the outer foil layer of the metal foil group is actually longer than the inner foil layer, in order to ensure that the foils in the metal foil group are always in a parallel and fitted state, after the heat shrinkage of the insulating tube of the metal foil group is completed, it needs to be pulled to the rolling roller for a circle every 1m before entering the next process.

[0076] The insulating foil group after heat shrinkage needs to be tested by a spark tester to see if the insulation performance is reliable. When the leakage foil group passes through the tiny bead chain in the spark tester, the tester will issue a warning and find out where the leakage is.

[0077] After the insulating foil group is tested, it is reeled by the winding reel 90. The winding reel 90 has the same mechanical structure as the second metal foil strip unwinder. When working, the rolling roller of the constant temperature heat shrink machine needs to be calibrated and aligned with the winding device of the winding reel.

[0078] like Fig.18 , 19 As shown, the preparation method of the transformer is: winding the foil winding on the iron core.

[0079] The foil winding is wound on the iron core by a winding device and then the insulating tape is wound. The winding device includes: The rotating roller 901 is used to introduce the foil winding. The surface of the rotating roller 901 has grooves so that the foil winding is clamped when entering the winding device.

[0080] The clamping mechanism 902 is used to clamp the iron core.

[0081] The rotation and translation mechanism 903 is used to drive the clamping mechanism to rotate and translate, wherein the rotation can be achieved by a motor and the translation can be achieved by a cylinder.

[0082] The positioning mechanism 904 is used to position the foil winding or the insulating tape. The positioning mechanism 904 can move up and down, and move downward to the vicinity of the iron core to position the foil winding or the insulating tape near the iron core.

[0083] The vacuum suction cup 905 is used to absorb the insulating tape. The vacuum suction cup 905 firmly absorbs the smooth side of the insulating tape on the vacuum suction cup 905, so that the insulating tape can remain in its original state after winding. In order to facilitate the provision of the insulating tape, an insulating tape roller 908 is arranged near the vacuum suction cup 905.

[0084] The clamping mechanism 902 , the rotation and translation mechanism 903 , and the positioning mechanism 904 are located on the transfer mechanism 906 , and the transfer mechanism 906 can achieve horizontal movement to approach the rotating roller 901 or the vacuum suction cup 905 .

[0085] The cutting tool 907 is used for cutting foil winding or insulating tape. The cutting tool 907 is controlled by three groups of cylinders. When two groups of cylinders lift the cutting tool, the foil winding or insulating tape roll in the middle of the tool is subjected to shear force and cut.

[0086] The winding uncoiler provides a foil winding, and the transfer mechanism 906 transfers the clamping mechanism 902, the rotating and translating mechanism 903, and the positioning mechanism 904 to the rotating roller 901. The clamping mechanism 902 clamps the iron core, and the rotating roller 901 introduces the foil winding. The positioning mechanism 904 positions the foil winding on the iron core, and the rotating and translating mechanism 903 moves to wind the foil winding on the iron core. After the winding is completed, the cutting tool 907 cuts off the foil winding; the transfer mechanism transfers the clamping mechanism 902, the rotating and translating mechanism 903, and the positioning mechanism 904 to the vacuum suction cup 905 that absorbs the insulating tape, and the rotating and translating mechanism 903 moves to wind the insulating tape onto the iron core. The positioning mechanism positions the insulating tape, and after the winding is completed, the cutting tool 907 cuts off the insulating tape. The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A method for preparing a transformer, the transformer comprising an iron core and a primary winding and a secondary winding wound on the iron core, characterized in that: The primary winding and the secondary winding are both formed by foil windings, wherein the foil windings include multiple layers of stacked foil strips in the same insulating sleeve, and adjacent foil strips are insulated. The preparation process of the foil windings is as follows: Cutting the insulating metal foil into metal foil strips and rolling them into single-layer foil strip rolls; stacking and rolling up the metal foil strips of a plurality of single-layer foil strip rolls into a multi-layer foil strip roll; Fix the multi-layer foil strips of the multi-layer foil strip roll and put them into the insulating tube; Heat shrink the multi-layer foil strips of the insulating tube and then roll them up; The preparation method of the transformer is: winding the foil winding on the iron core.

2. The method for preparing a transformer according to claim 1, characterized in that: The fixing clamp for fixing the multi-layer foil strip includes a first clamping part and a second clamping part set at a certain angle, the first clamping part and the second clamping part are connected by a connecting part, and the free end of the fixing clamp has an auxiliary clamping part set opposite to each other. After the multi-layer foil strip enters the fixing clamp, the first clamping part and the second clamping part are clamped, and the auxiliary clamping part and the connecting part are clamped.

3. The method for preparing a transformer according to claim 2, characterized in that: First, the first clamping portion and the second clamping portion are clamped by two transverse pressure rollers, and then the auxiliary clamping portion and the connecting portion are clamped by two longitudinal pressure rollers.

4. The method for preparing a transformer according to claim 1, characterized in that: The method for putting the fixed multi-layer foil strip on the insulating tube is: a magnetic suction device outside the insulating tube is moved along the direction of the insulating tube to attract the multi-layer foil strip in the insulating tube to move in the insulating tube.

5. The method for preparing a transformer according to claim 4, characterized in that: The fixed multi-layer foil strip is mounted on the insulating tube by a tube-piercing device, and the tube-piercing device comprises: A frame, wherein an insulating tube positioning portion is provided on the frame, and the insulating tube positioning portion is used to position the insulating tube; A conveyor belt is arranged along the direction of the insulating tube, and a magnetic attraction device is provided on the conveyor belt.

6. The method for preparing a transformer according to claim 5, characterized in that: The insulating tube positioning portion is an insulating tube positioning groove spirally arranged on the frame; the tube insertion device includes: A fan, used for blowing air into the insulating tube; A detachable shell is provided with an air suction device for sucking out the air in the shell.

7. The method for preparing a transformer according to claim 6, characterized in that: The detachable shell is provided with an insulating tube positioning groove, and a suction port is provided at a position corresponding to the insulating tube positioning groove, and the suction port is connected to the suction device.

8. The method for preparing a transformer according to claim 5, characterized in that: The conveyor belt is located in the frame, a conveyor roller is arranged in the frame, and the conveyor belt circulates on the conveyor roller.

9. The method for preparing a transformer according to claim 1, characterized in that: After heat shrinking, it is rolled up after being rolled around by a rolling roller and tested by a spark tester.

10. The method for preparing a transformer according to any one of claims 1 to 9, characterized in that: The foil winding is wound on the iron core by a winding device and then an insulating tape is wound, wherein the winding device comprises: a rotating roller for introducing the foil winding; A clamping mechanism, used for clamping the iron core; A rotation and translation mechanism, used to drive the clamping mechanism to rotate and translate; A positioning mechanism for positioning the foil winding or insulating tape; Vacuum suction cup, used to absorb insulating tape; A transfer mechanism, wherein the clamping mechanism, the rotation and translation mechanism, and the positioning mechanism are located on the transfer mechanism; A cutting tool, used for cutting the foil winding or the insulating tape; The transfer mechanism transfers the clamping mechanism, the rotating and translating mechanism, and the positioning mechanism to the rotating roller, the clamping mechanism clamps the iron core, the rotating roller introduces the foil winding, the positioning mechanism positions the foil winding on the iron core, the rotating and translating mechanism operates to wind the foil winding on the iron core, and the cutting tool cuts off the foil winding after the winding is completed; the transfer mechanism transfers the clamping mechanism, the rotating and translating mechanism, and the positioning mechanism to the vacuum suction cup that absorbs the insulating tape, the rotating and translating mechanism operates to wind the insulating tape onto the iron core, the positioning mechanism positions the insulating tape, and the cutting tool cuts off the insulating tape after the winding is completed.

Images