Strong anti-interference Hall current sensor and preparation method thereof

Abstract

The invention discloses a Hall current sensor with strong anti-interference performance and a preparation method thereof, the Hall current sensor comprises a circuit board installed in a protective shell, a Hall element is installed on the circuit board, a plurality of pins of the Hall element are respectively covered with a pin shielding layer, and the pin shielding layers are arranged on the circuit board. The outer surface of the protective shell is covered with a side shell shielding layer; the preparation method comprises the film covering operation of film covering of the Hall element and the assembling operation of the Hall current sensor, the film covering operation carries out hot-pressing film covering of a shielding film on the Hall pin through a shielding layer attaching system, the assembling operation is that the Hall element is installed on the circuit board, and then the circuit board is installed in the protective shell. According to the invention, the anti-interference performance of the Hall current sensor is improved, and the detection precision of the Hall current sensor is improved. The method is suitable for the technical field of Hall current sensor production and processing.

Description

Technical Field

[0001] The invention belongs to the technical field of production and processing of Hall current sensors, and in particular, relates to a Hall current sensor with strong anti-interference and a preparation method thereof. Background Art

[0002] The Hall current sensor is designed based on the Hall effect principle. It indirectly measures the current of the current-carrying conductor by measuring the size of the Hall potential. In addition, it has the advantages of high precision, small size, wide bandwidth, and strong overload capacity, and is widely used in the field of detection. At present, in use, especially in measuring equipment with high precision requirements, the accuracy requirements for Hall current sensors are also extremely high. However, due to the influence of external electromagnetic waves, the detection results of the Hall current sensor deviate, which ultimately affects the measurement accuracy. Therefore, there is an urgent need for a Hall current sensor that can effectively resist interference from external electromagnetic waves to improve the detection accuracy of the Hall current sensor. Summary of the invention

[0003] The present invention provides a Hall current sensor with strong anti-interference performance and a preparation method thereof, so as to improve the anti-interference performance of the Hall current sensor and the detection accuracy of the Hall current sensor.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A Hall current sensor with strong anti-interference performance comprises a circuit board installed in a protective shell, a Hall element is installed on the circuit board, multiple pins of the Hall element are covered with a pin shielding layer, and the outer surface of the protective shell is covered with a shell shielding layer on one side.

[0006] The present invention also discloses a method for preparing the above-mentioned Hall current sensor with strong anti-interference, comprising the following steps:

[0007] Hall element coating

[0008] Step 1. Continuously supply the Hall element strip to the shield layer attachment system;

[0009] Step 2: Control the film releasing device of the shielding layer attaching system to continuously release the two shielding films to the upper and lower ends of the Hall element strip;

[0010] Step 3. Control the hot pressing film device to hot press the two shielding films onto the upper and lower ends of the pin strip of the Hall element strip;

[0011] Step 4: Control the film cutting device to cut the shielding film between two adjacent pins at the pin strip;

[0012] Step 5. Control the winding device to wind up the coated and cut Hall element strip;

[0013] Assembly of Hall Current Sensor

[0014] S1. Remove each Hall element on the Hall element strip after coating one by one;

[0015] S2. Install the Hall element on the circuit board and ensure that the pin end of the Hall element is electrically connected to the circuit board, on which a magnetic core, an excitation circuit and a signal processing circuit are constructed to form a Hall current sensor in conjunction with the Hall element;

[0016] S3. Install the assembled circuit board in a protective case.

[0017] Furthermore, the film unwinding device includes two film unwinding shafts arranged opposite to each other up and down, and the two ends of the film unwinding shafts are respectively rotatably connected with adapter plates, and a first transmission wheel is coaxially assembled at one axial end of the film unwinding shaft, and the shielding film is wound on the film unwinding shaft; a guide preheating film device is arranged between the film unwinding device and the hot pressing film device, and the shielding film is unwound by the film unwinding device and enters the hot pressing film device after being guided by the guide preheating film device.

[0018] Furthermore, the guide preheating film device includes two guide preheating roller groups arranged opposite to each other up and down, and each of the guide preheating roller groups includes a plurality of adjustable guide rollers arranged in sequence along the conveying direction of the Hall element belt and inclined toward the Hall element belt. One adjustable guide roller is selected to be connected to the transverse beam, and two adjacent adjustable guide rollers are connected via a connecting plate.

[0019] Furthermore, the adjustable guide roller includes a roller-shaped body whose axial ends are rotatably connected to vertical tubes through first shaft rods, a first electric heating wire is installed in the roller-shaped body, a vertical rod is movably inserted at the upper end of each vertical tube, the upper end of each vertical rod passes through the transverse plate, a locking nut is threadedly connected to the vertical rod, a telescopic spring is sleeved on the outer surface of the vertical rod, and the two ends of the telescopic spring are respectively connected to the transverse plate and the vertical tube; a connecting seat is provided above the transverse plate, a first vertical adjusting screw is threadedly connected to the connecting seat, and the lower end of the first vertical adjusting screw is rotatably connected to the transverse plate, a first operating handwheel is installed at the upper end of the first vertical adjusting screw, and at least one vertical guide rod is constructed on the transverse plate, and the upper end of the vertical guide rod movably passes through the connecting seat.

[0020] Furthermore, the hot pressing film device includes two vertical guide rail groups symmetrically installed on both sides of the assembly frame, and hot pressing film roller groups are symmetrically arranged between the two vertical guide rail groups and at the upper and lower ends of the Hall element belt, and each of the hot pressing film roller groups is transmission-connected to the two vertical guide rail groups.

[0021] Furthermore, each of the vertical guide rail groups includes two vertical guide rails spaced apart along the conveying direction of the Hall element belt, each of the hot pressing film roller groups includes two hot pressing rollers spaced apart along the conveying direction of the Hall element belt, and each of the axial ends of the hot pressing roller is rotatably connected to a sliding block via a second shaft rod, and each of the sliding blocks is slidably connected to the corresponding vertical guide rail, and a second vertical adjusting screw is rotatably connected to each sliding block, and the second vertical adjusting screw is threadedly connected to the assembly frame, and a second operating hand wheel is installed at the end of the second vertical adjusting screw away from the sliding block, and an axial end of a hot pressing roller is selected A driving motor is installed, and second transmission wheels are respectively installed on the same side ends of the two hot pressing rollers, and the two second transmission wheels are connected by a transmission belt; and the rotation directions of the two hot pressing rollers arranged opposite to each other in the two hot pressing film roller groups are opposite; rolling wheels are coaxially installed on the two second shafts of the hot pressing roller, and there are two Hall element belts, which are arranged opposite to each other, and the two pin parts of the two Hall element belts are close to each other, and the two semiconductor parts are far away from each other, the hot pressing roller is rolled on the corresponding end faces of the two pin parts, and the two rolling wheels are rolled on the corresponding end faces of the two semiconductor parts respectively.

[0022] Furthermore, the hot pressing roller includes a pressing roller body with a built-in second electric heating wire, and a plurality of first assembly grooves are evenly opened on the circumferential surface of the pressing roller body along its circumference, and each of the first assembly grooves extends out of the two ends of the pressing roller body along the axial direction of the pressing roller body, and a first operating port is respectively opened at the two axial ends of the pressing roller body, and a plurality of first connecting holes are respectively opened on the pressing roller body and located at each first operating port, and each of the first connecting holes is connected to the corresponding first assembly groove; a hot pressing strip or a sealing groove strip is installed in each first assembly groove, and the hot pressing strip is hot pressed on the area between adjacent pins, and the outer end surface of the sealing groove strip is hot pressed on the end surface of the pin.

[0023] Furthermore, the film cutting device includes two film cutting rollers symmetrically arranged at the upper and lower ends of the Hall element belt, and the axial ends of each of the film cutting rollers are rotatably connected to the two transfer arms through a third shaft rod, and one of the third shaft rods is connected to the power motor. The two transfer arms located on the same side of the two film cutting rollers are connected through a vertical adjustment rod, and a first threaded portion and a second threaded portion with opposite rotation directions are vertically spaced on the vertical adjustment rod. The first threaded portion and the second threaded portion are threadedly connected to the two transfer arms respectively, and the lower end of the vertical adjustment rod is rotatably connected to the assembly plate, and the upper end of the vertical adjustment rod is provided with a third operating handwheel.

[0024] Furthermore, the film cutting roller includes an annular cutting knife coaxially constructed in the middle of the knife roller body, a plurality of second assembly grooves evenly arranged along the circumference of the knife roller body are respectively provided on the outer peripheral wall of the knife roller body and located on both sides of the annular cutting knife, second operating ports are respectively provided at the axial ends of the knife roller body, and a plurality of second connecting holes are provided on the knife roller body and located at each second operating port, each of the second connecting holes is connected to the corresponding second assembly groove, and a cutting knife strip is installed in each second assembly groove, the cutting knife strip cuts the area between adjacent pins, and the annular cutting knife cuts the area between two pin portions in two Hall element bands.

[0025] Due to the adoption of the above structure, the technical progress achieved by the present invention compared with the prior art is that: since a part of the pins of the existing Hall current sensor will be exposed after connection, a part of the electromagnetic interference is generated by this part. The present invention covers the pins of the Hall element in the Hall current sensor with a pin shielding layer to shield the interference of electromagnetic waves, and ensures that the pin shielding layer of the Hall element in the Hall current sensor is exposed and will not be damaged after being electrically connected to the circuit board. The present invention also covers the protective shell that accommodates the Hall current sensor with a shell shielding layer, and the protective shell wraps all the parts of the Hall current sensor except the pins of the Hall element inside it, so that the shell shielding layer shields the external electromagnetic interference outside the Hall current sensor, and the pins of the Hall element are generally located outside the protective shell, which is convenient for the disassembly, replacement, etc. of the Hall element. The present invention uses a shielding layer attachment system to batch coat the Hall element with a shielding film, improves the coating efficiency of the pin shielding layer, and cooperates with the subsequent assembly of the Hall current sensor to improve the production and processing efficiency of the Hall current sensor. In summary, the present invention improves the anti-interference performance of the Hall current sensor and improves the detection accuracy of the Hall current sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0027] In the attached picture:

[0028] Figure 1 It is a structural schematic diagram of a shielding layer attachment system according to an embodiment of the present invention;

[0029] Figure 2 It is a structural side view of a shielding layer attachment system according to an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of two Hall element strips covered with a film according to an embodiment of the present invention after being partially cut;

[0031] Figure 4 It is a schematic structural diagram of the corresponding arrangement of the film placing device and the guiding preheating film device according to an embodiment of the present invention;

[0032] Figure 5 It is a structural schematic diagram of a guide preheating roller group in a guide preheating film device according to an embodiment of the present invention;

[0033] Figure 6 It is a structural schematic diagram of an adjustable guide roller in a guide preheating roller group according to an embodiment of the present invention;

[0034] Figure 7 It is a structural schematic diagram of a hot pressing film device according to an embodiment of the present invention;

[0035] Figure 8 It is a structural schematic diagram of the hot pressing film device from another angle according to an embodiment of the present invention;

[0036] Fig. 9 It is a schematic structural diagram of the connection between a hot pressing roller, a driving motor, two rolling wheels and two sliding blocks in a hot pressing film device according to an embodiment of the present invention;

[0037] Fig.10 It is a schematic structural diagram of the connection between the hot pressing roller, the second shaft rod, the sliding block and the second vertical adjustment screw according to an embodiment of the present invention;

[0038] Fig.11 A structural side view of a hot pressing roller in a hot pressing film device according to an embodiment of the present invention;

[0039] Fig.12 It is a schematic diagram of the partial structure of the pressing roller body in the hot pressing roller of an embodiment of the present invention;

[0040] Fig.13 It is a schematic diagram of the partial structure of the hot pressing strip in the hot pressing roller of an embodiment of the present invention;

[0041] Fig.14 It is a schematic diagram of the partial structure of the sealing groove strip in the hot pressing roller of an embodiment of the present invention;

[0042] Fig.15 This is a schematic diagram of the structure of a film cutting device according to an embodiment of the present invention;

[0043] Fig.16 This is a structural side view of a film cutting device according to an embodiment of the present invention;

[0044] Fig.17 It is a structural schematic diagram of the connection between the film cutting roller and the power motor in the film cutting device of an embodiment of the present invention;

[0045] Fig.18 A structural side view of a film cutting roller in a film cutting device according to an embodiment of the present invention;

[0046] Fig.19It is a schematic structural diagram of a knife roller body in a film cutting roller according to an embodiment of the present invention;

[0047] Fig. 20 This is a schematic diagram of the structure of the cutting blade in the film cutting roller according to an embodiment of the present invention;

[0048] Fig.21 Schematic diagram of the structure of a protective shell according to an embodiment of the present invention.

[0049] Labeled parts: 100-Hall element belt, 101-semiconductor part, 102-pin part, 103-connecting belt, 200-shielding film, 201-pin shielding layer, 202-longitudinal cutting seam, 203-transverse cutting seam, 300-film release device, 301-adapter plate, 302-film release shaft, 303-first transmission wheel, 400-guide preheating film device, 401-transverse beam, 402-connecting plate, 403-connecting seat, 404-transverse plate, 405-roller body, 406-first shaft, 407-vertical tube, 408-adapter sleeve, 409-vertical rod, 410-locking nut, 411-telescopic spring, 412-first vertical adjustment screw, 413-first operating hand wheel, 414-vertical guide rod, 500-hot pressing film device, 501-assembly frame, 502-vertical guide rail, 503-hot pressing roller, 5031-pressing roller body, 5032-first assembly groove, 5033-first operating port, 5034-first connecting hole, 5035 -first assembly strip, 5036-transition part, 5037-heat pressing strip, 5038-second assembly strip, 5039-sealing strip, 504-rolling wheel, 505-second shaft, 506-second transmission wheel, 507-transmission belt, 508-driving motor, 509-sliding block, 510-second vertical adjustment screw, 511-second operating hand wheel, 512-conductive slip ring, 600-film cutting device, 601-film cutting roller, 6011-knife roller body, 6012-annular cutting Knife, 6013-second assembly groove, 6014-second operating port, 6015-second connecting hole, 6016-third assembly strip, 6017-cutting knife strip, 602-third shaft rod, 603-power motor, 604-transfer arm, 605-vertical adjustment rod, 606-assembly plate, 607-first threaded portion, 608-second threaded portion, 609-third operating handwheel, 700-winding material device, 800-protective shell, 801-installation cavity, 802-shell shielding layer. DETAILED DESCRIPTION

[0050] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0051] The present invention discloses a Hall current sensor with strong anti-interference, including a circuit board installed in a protective shell 800, on which a Hall element is installed. This structure is an existing connection structure and will not be described in detail here. The main difference is that a plurality of pins of the Hall element are covered with a pin shielding layer 201, and a side shell shielding layer 802 is covered on the outer surface of the protective shell 800. The working principle and advantage of the present invention are: since a part of the pins of the existing Hall current sensor will be exposed to the outside after connection, a part of the electromagnetic interference is generated by this part. The present invention covers the pins of the Hall element in the Hall current sensor with a pin shielding layer 201 to shield the interference of electromagnetic waves, and ensures that after the pins of the Hall element in the Hall current sensor are electrically connected to the circuit board, the pin shielding layer 201 is exposed to the outside and will not be damaged. The present invention also covers the protective shell 800 containing the Hall current sensor with a shell shielding layer 802, and the protective shell 800 wraps all parts of the Hall current sensor except the pins of the Hall element, so that the shell shielding layer 802 shields the external electromagnetic interference from the Hall current sensor. In addition, the pins of the Hall element are generally located outside the protective shell 800, which is convenient for disassembly, replacement, etc. of the Hall element. In summary, the present invention improves the anti-interference performance of the Hall current sensor and improves the detection accuracy of the Hall current sensor.

[0052] The present invention also discloses a method for preparing the Hall current sensor with strong anti-interference properties, such as Figure 1-21 As shown, the following steps are included:

[0053] Hall element coating

[0054] Step 1. Continuously supplying the Hall element strip 100 into the shielding layer attaching system;

[0055] Step 2: Control the film placing device 300 of the shielding layer attaching system to continuously release the two shielding films 200 to the upper and lower ends of the Hall element strip 100;

[0056] Step 3. Control the hot pressing film device 500 to hot press the two shielding films 200 onto the upper and lower ends of the pin strip of the Hall element strip 100;

[0057] Step 4. Control the film cutting device 600 to cut the shielding film 200 between two adjacent pins at the pin strip;

[0058] Step 5: Control the winding device 700 to wind up the coated and cut Hall element strip 100.

[0059] Assembly of Hall Current Sensor

[0060] S1. Remove each Hall element on the Hall element strip 100 after coating one by one;

[0061] S2. Install the Hall element on the circuit board and ensure that the pin end of the Hall element is electrically connected to the circuit board, on which a magnetic core, an excitation circuit and a signal processing circuit are constructed to form a Hall current sensor in conjunction with the Hall element;

[0062] S3. Install the assembled circuit board in the protective case 800.

[0063] The working principle and advantages of the present invention are as follows: the present invention performs the shielding film 200 coating operation on the Hall elements in batches through the shielding layer attaching system, thereby improving the coating efficiency of the pin shielding layer 201, cooperating with the subsequent assembly of the Hall current sensor, and improving the production and processing efficiency of the Hall current sensor.

[0064] As a preferred embodiment of the present invention, Figure 3 As shown, the Hall element strip 100 includes a connecting strip 103, on which a plurality of Hall elements are fixed at intervals along the length direction thereof, thereby forming a strip-shaped structure, and the portion where the Hall element is fixed to the connecting strip 103 is the semiconductor pole piece of the Hall element, the semiconductor pole piece portion of the Hall element forms a continuous semiconductor portion 101 at the connecting strip 103, and the pins of the Hall element form a continuous pin portion 102 at the connecting strip 103. In this way, the Hall elements on the Hall element strip 100 are conveniently processed continuously, thereby improving the processing efficiency.

[0065] As a preferred embodiment of the present invention, Figure 4 As shown, the film unwinding device 300 includes two film unwinding shafts 302 arranged opposite to each other up and down, and the two ends of each film unwinding shaft 302 are rotatably connected to an adapter plate 301, and each adapter plate 301 is connected to the frame. A first transmission wheel 303 is coaxially mounted on one axial end of the film unwinding shaft 302, and the shielding film 200 is wound on the film unwinding shaft 302. In this embodiment, the first transmission wheel 303 is driven to rotate, so that it drives the film unwinding shaft 302 to rotate, thereby achieving the purpose of the film unwinding shaft 302 gradually unwinding the shielding film 200 thereon, and achieving the continuous output of the shielding film 200 to the hot pressing film device 500. In addition, the two film unwinding shafts 302 are unwound synchronously, so as to achieve the purpose of continuously conveying the shielding film 200 to the upper and lower end surfaces of the pin portion 102 of the Hall element in the Hall element belt 100. In order to smoothly and gently supply the shielding film 200 to the hot pressing film device 500 and preheat the shielding film 200 so that the shielding film 200 can be fully hot pressed onto the pins of the Hall element at the hot pressing film device 500, the measures taken in this embodiment are as follows: a guide preheating film device 400 is arranged between the film unwinding device 300 and the hot pressing film device 500, and the shielding film 200 is unrolled from the film unwinding device 300, and then, after being guided by the guide preheating film device 400, it continuously enters the hot pressing film device 500.

[0066] As a preferred embodiment of the present invention, Figure 4-6As shown, the guide preheating film device 400 includes two guide preheating roller groups, which are arranged opposite to each other up and down. Each guide preheating roller group includes a plurality of adjustable guide rollers, which are arranged in sequence along the conveying direction of the Hall element belt 100 and tilted toward the Hall element belt 100, one of the adjustable guide rollers is connected to the transverse beam 401, and two adjacent adjustable guide rollers are connected via a connecting plate 402. Specifically, the adjustable guide roller includes a roller-shaped body 405, a first vertical adjustment screw 412, a transverse plate 404 and a connecting seat 403, wherein the two ends of the roller-shaped body 405 are respectively connected to the first shaft rods 406, and the two first shaft rods 406 coincide with the axis of the roller-shaped body 405. A vertical tube 407 is arranged at each first shaft rod 406, and an adapter sleeve 408 is constructed at one end of the vertical tube 407 close to the first shaft rod 406. The adapter sleeve 408 is rotatably assembled on the first shaft rod 406, and a first electric heating wire is installed in the roller-shaped body 405 for heating the roller-shaped body 405, so that the roller-shaped body 405 preheats the shielding film 200 passing through the roller-shaped body 405. In this embodiment, a vertical rod 409 is movably inserted at the upper end of each vertical tube 407, and the upper end of each vertical rod 409 passes through the horizontal plate 404. A locking nut 410 is threadedly connected to the vertical rod 409, and a telescopic spring 411 is sleeved on the vertical rod 409. The two ends of the telescopic spring 411 are respectively connected to the horizontal plate 404 and the vertical tube 407. In this embodiment, a connecting seat 403 is arranged above the horizontal plate 404, a first vertical adjustment screw 412 is threadedly connected to the connecting seat 403, and the lower end of the first vertical adjustment screw 412 is rotatably connected to the horizontal plate 404, a first operating hand wheel 413 is installed at the upper end of the first vertical adjustment screw 412, and at least one vertical guide rod 414 is constructed on the horizontal plate 404, and the upper end of the vertical guide rod 414 movably passes through the connecting seat 403. The working principle and advantages of this embodiment are as follows: the shielding film 200 of this embodiment passes through the lower ends of each adjustable guide roller in turn, and each roller-shaped body 405 is elastically pressed on the surface of the shielding film 200. During the transportation of the shielding film 200, the tension of the shielding film 200 changes, causing the force acting on the roller-shaped body 405 to change, thereby causing the roller-shaped body 405 to move vertically, thereby causing the telescopic spring 411 to undergo elastic deformation. In order to enable the roller-shaped body 405 to be effectively pressed on the shielding film 200, the present embodiment can rotate the first vertical adjustment screw 412 to drive the transverse plate 404 to move vertically, so that the transverse plate 404 drives the roller-shaped body 405 to gradually approach the shielding film 200 until the roller-shaped body 405 is effectively pressed on the surface of the shielding film 200; and since the present embodiment adopts a plurality of adjustable guide rollers, the shielding film 200 can be smoothly transitioned to the hot pressing film device 500, ensuring that the shielding film 200 is stably transported into the hot pressing film device 500, avoiding deflection, shaking, etc. of the shielding film 200.

[0067] As a preferred embodiment of the present invention, Figure 7-10As shown, the hot pressing film device 500 includes two vertical guide rail groups symmetrically installed on both sides of the assembly frame 501, and two hot pressing film roller groups are arranged between the two vertical guide rail groups. The two hot pressing film roller groups are symmetrically arranged at the upper and lower ends of the Hall element belt 100, and each hot pressing film roller group is connected to the two vertical guide rail groups in a transmission manner. Each vertical guide rail group includes two vertical guide rails 502, and the two vertical guide rails 502 are arranged at intervals along the conveying direction of the Hall element belt 100. In this embodiment, each hot pressing film roller group includes two hot pressing rollers 503, and the two hot pressing rollers 503 are arranged at intervals along the conveying direction of the Hall element belt 100. Second shafts 505 are respectively constructed at both axial ends of each hot pressing roller 503, and the two second shafts 505 coincide with the axis of the hot pressing roller 503, and sliding blocks 509 are respectively rotatably connected to the two second shafts 505, and each sliding block 509 is slidably connected to the corresponding vertical guide rail 502, and a second vertical adjustment screw 510 is rotatably connected to each sliding block 509, and the second vertical adjustment screw 510 is threadedly connected to the assembly frame 501, and a second operating hand wheel 511 is installed at the end of the second vertical adjustment screw 510 away from the sliding block 509. In this embodiment, one axial end of one of the hot pressing rollers 503 is coaxially connected to the output shaft of the driving motor 508, and the driving motor 508 is connected to the corresponding sliding block 509. The same-side ends of the two hot pressing rollers 503 in the hot pressing film roller group are respectively equipped with second transmission wheels 506, and the two second transmission wheels 506 are connected through transmission belts 507. In addition, the rotation directions of the two hot pressing rollers 503 arranged opposite to each other in the two hot pressing film roller groups are opposite, and rolling wheels 504 are coaxially mounted on the two second shafts 505 of the hot pressing rollers 503. In this embodiment, there are two Hall element belts 100, which are arranged opposite to each other, and the two pin parts 102 in the two Hall element belts 100 are close to each other, and the two semiconductor parts 101 are far away from each other. The above-mentioned hot pressing rollers 503 are rolled on the corresponding end faces of the two pin parts 102, and the two rolling wheels 504 are rolled on the corresponding end faces of the two semiconductor parts 101. The working principle and advantages of this embodiment are as follows: this embodiment controls the two driving motors 508 to operate, thereby making the two hot pressing film roller groups operate synchronously, so that the two hot pressing rollers 503 arranged opposite to each other in the upper and lower ends of the two pin parts 102 in the two Hall element strips 100 are synchronously rolled, so that the two shielding films 200 are hot pressed on the upper and lower ends of the pin parts 102, and the two rolling wheels 504 are respectively rolled on the corresponding end faces of the two semiconductor parts 101, and the rolling wheels 504 are used to ensure that the Hall element strip 100 moves forward steadily, and avoid the Hall element strip 100 from being deflected or loosened. In order to ensure that the shielding film 200 can be firmly hot pressed on the end face of the pin part 102, the number of hot pressing rollers 503 in the hot pressing film roller group is not less than two, so that the purpose of multiple hot pressing of the shielding film 200 can be achieved.In this embodiment, the second vertical adjustment screw 510 can be rotated to drive the sliding block 509 to move vertically, thereby adjusting the vertical position of the heat pressing roller 503 to ensure that the heat pressing roller 503 can effectively heat press the shielding film 200 onto the pin portion 102 .

[0068] As a preferred embodiment of the present invention, Figure 10-14 As shown, the hot pressing roller 503 includes a pressing roller body 5031, a second electric heating wire is arranged in the pressing roller body 5031, and a conductive slip ring 512 is installed on a sliding block 509 connected to the pressing roller body 5031, and the conductive slip ring 512 is electrically connected to the wire of the second electric heating wire. In this embodiment, a plurality of first assembly grooves 5032 are provided on the circumferential surface of the pressing roller body 5031, and these first assembly grooves 5032 are evenly arranged along the circumference of the pressing roller body 5031, and each first assembly groove 5032 extends out of the two ends of the pressing roller body 5031 along the axial direction of the pressing roller body 5031. First operating ports 5033 are respectively provided at the two axial ends of the pressing roller body 5031, and a plurality of first connecting holes 5034 are respectively provided on the pressing roller body 5031 and located at each first operating port 5033, and each first connecting hole 5034 is connected to the corresponding first assembly groove 5032. In this embodiment, a heat press strip 5037 or a sealing groove strip 5039 is installed in each first assembly groove 5032. The heat press strip 5037 is heat-pressed on the area between two adjacent pins in the Hall element, and the outer end surface of the sealing groove strip 5039 is heat-pressed on the end surface of the pin. The heat press strip 5037 is connected to the first assembly strip 5035 through the transition portion 5036. The first assembly strip 5035 is installed in the corresponding first assembly groove 5032, and then the first assembly strip 5035 is connected to the roller body 5031 by bolts. In this embodiment, the heat press strip 5037 of different widths can be replaced according to the size of the gap between adjacent pins. The sealing groove strip 5039 of this embodiment is configured with a second assembly strip 5038, which is installed in the corresponding first assembly groove 5032, and then the second assembly strip 5038 is connected to the roller body 5031 by bolts. In this embodiment, the number of heat press strips 5037 and sealing strips 5039 installed on the pressure roller body 5031 can be changed according to the spacing between two adjacent Hall elements on the Hall element strip 100, and the number of alternating intervals of the heat press strips 5037 and sealing strips 5039 can be adjusted, for example, a sealing strip 5039 is installed every other heat press strip 5037, or a sealing strip 5039 is installed every two heat press strips 5037, or two sealing strips 5039 are installed every other heat press strip 5037..., thereby ensuring that the heat press strip 5037 heat presses the shielding film 200 to the gap between adjacent pins, and ensuring that the sealing strip 5039 heat presses the shielding film 200 onto the end surface of the pin.

[0069] As a preferred embodiment of the present invention, Figure 15-17 As shown, the film cutting device 600 includes two film cutting rollers 601, which are symmetrically arranged at the upper and lower ends of the Hall element strip 100, and a third shaft 602 is connected to the axial ends of each film cutting roller 601, respectively. The two third shafts 602 coincide with the axis of the film cutting roller 601, and the two third shafts 602 are respectively rotatably connected with two transfer arms 604, and one of the third shafts 602 is coaxially connected with the output shaft of the power motor 603. In this embodiment, the two transfer arms 604 located on the same side of the two film cutting rollers 601 are connected through a vertical adjustment rod 605, and a first threaded portion 607 and a second threaded portion 608 with opposite rotation directions are constructed on the vertical adjustment rod 605 along the vertical interval, and the first threaded portion 607 and the second threaded portion 608 are respectively threadedly connected with the two transfer arms 604, and the lower end of the vertical adjustment rod 605 is rotatably connected with the assembly plate 606, and the upper end of the vertical adjustment rod 605 is installed with a third operating hand wheel 609. The working principle and advantages of this embodiment are as follows: this embodiment controls two power motors 603 to act synchronously, so that the two film cutting rollers 601 rotate relatively, and cuts the two Hall element strips 100 after coating, so that the shielding film 200 on the Hall element strip 100 is cut with a longitudinal cutting slit 202 and a plurality of transverse cutting slits 203. The longitudinal cutting slit 202 is formed in the area where the two pins 102 of the two Hall element strips 100 are close to each other, that is, the two Hall element strips 100 are separated. Each transverse cutting slit 203 in a part of the transverse cutting slits 203 is formed in the area between two pins close to each other on the Hall element strip 100, that is, the shielding film 200 at the adjacent pins in the Hall element is separated; each transverse cutting slit 203 in another part of the transverse cutting slits 203 is formed in the area between the pins close to each other in the adjacent Hall elements, that is, the pins of the adjacent Hall elements are separated. In this embodiment, the vertical adjustment rod 605 can be rotated so that the vertical adjustment rod 605 drives the two film cutting rollers 601 to move closer to or farther from each other, so as to achieve the purpose of sufficient cutting by the two film cutting rollers 601 .

[0070] As a preferred embodiment of the present invention, Figure 18-20As shown, the film cutting roller 601 includes a knife roller body 6011, an annular cutting knife 6012 is constructed in the middle of the knife roller body 6011, and the annular cutting knife 6012 coincides with the axis of the knife roller body 6011. A plurality of second assembly grooves 6013 are respectively provided on the outer peripheral wall of the knife roller body 6011 and on both sides of the annular cutting knife 6012, which are uniformly arranged along the circumference of the knife roller body 6011. Second operating ports 6014 are respectively provided at the axial ends of the knife roller body 6011. A plurality of second connection holes 6015 are provided at each second operation port 6014, each second connection hole 6015 is connected to a corresponding second assembly groove 6013, and a cutting blade strip 6017 is installed in each second assembly groove 6013; that is, a third assembly strip 6016 is configured at one end of the cutting blade strip 6017 close to the blade roller body 6011, and the third assembly strip 6016 is installed in the corresponding second assembly groove 6013, and then the third assembly strip 6016 is connected to the blade roller body 6011 by bolts. The cutting blade strip 6017 of this embodiment cuts the area between adjacent pins, and the annular cutting blade 6012 cuts the area between two pin portions 102 in two Hall element strips 100. In this embodiment, the number of cutting strips 6017 installed on the knife roller body 6011 can be changed according to the spacing between two adjacent Hall elements on the Hall element strip 100, and the spacing between the cutting strips 6017 can be adjusted. For example, a cutting guide strip is installed in each second assembly groove 6013, or a cutting strip 6017 is installed every other third assembly groove 6016, or a third assembly groove is left empty after installing two consecutive third assembly grooves..., thereby ensuring that the cutting strip 6017 will be hot-pressed to cut the shielding film 200 between adjacent pins.

[0071] As a preferred embodiment of the present invention, Fig.21 As shown, the protective shell 800 is divided into two half shells, and a mounting cavity 801 is formed at the corresponding ends of the two half shells. The mounting cavity 801 is used to install various components of the Hall current sensor. The outer walls of the two half shells are respectively covered with a shell shielding layer 802.

[0072] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A Hall current sensor with strong anti-interference, comprising a circuit board installed in a protective shell, on which a Hall element is installed, characterized in that: A plurality of pins of the Hall element are all covered with a pin shielding layer, and an outer surface of the protective shell is covered with a shell shielding layer.

2. A method for preparing a Hall current sensor with strong anti-interference as claimed in claim 1, characterized in that: The steps include: Hall element coating Step 1. Continuously supply the Hall element strip to the shield layer attachment system; Step 2: Control the film releasing device of the shielding layer attaching system to continuously release the two shielding films to the upper and lower ends of the Hall element strip; Step 3. Control the hot pressing film device to hot press the two shielding films onto the upper and lower ends of the pin strip of the Hall element strip; Step 4: Control the film cutting device to cut the shielding film between two adjacent pins at the pin strip; Step 5. Control the winding device to wind up the coated and cut Hall element strip; Assembly of Hall Current Sensor S1. Remove each Hall element on the Hall element strip after coating one by one; S2. Install the Hall element on the circuit board and ensure that the pin end of the Hall element is electrically connected to the circuit board, on which a magnetic core, an excitation circuit and a signal processing circuit are constructed to form a Hall current sensor in conjunction with the Hall element; S3. Install the assembled circuit board in a protective case.

3. The method for preparing a Hall current sensor with strong anti-interference according to claim 2, characterized in that: The film unwinding device includes two film unwinding shafts arranged opposite to each other up and down, and both ends of the film unwinding shafts are rotatably connected with adapter plates, and a first transmission wheel is coaxially assembled at one axial end of the film unwinding shaft, and the shielding film is rolled up on the film unwinding shaft; a guide preheating film device is arranged between the film unwinding device and the hot pressing film device, and the shielding film is unwound by the film unwinding device and enters the hot pressing film device after being guided by the guide preheating film device.

4. The method for preparing a Hall current sensor with strong anti-interference according to claim 3 is characterized in that: The guide preheating film device includes two guide preheating roller groups arranged opposite to each other up and down, each of the guide preheating roller groups includes a plurality of adjustable guide rollers arranged in sequence along the conveying direction of the Hall element belt and inclined toward the Hall element belt, one adjustable guide roller is selected to be connected to the transverse beam, and two adjacent adjustable guide rollers are connected via a connecting plate.

5. The method for preparing a Hall current sensor with strong anti-interference according to claim 4, characterized in that: The adjustable guide roller includes a roller-shaped body whose axial ends are rotatably connected to vertical tubes through first shaft rods, a first electric heating wire is installed in the roller-shaped body, a vertical rod is movably inserted at the upper end of each vertical tube, the upper end of each vertical rod passes through the transverse plate, a locking nut is threadedly connected to the vertical rod, a telescopic spring is sleeved on the outer surface of the vertical rod, the two ends of the telescopic spring are respectively connected to the transverse plate and the vertical tube; a connecting seat is provided above the transverse plate, a first vertical adjusting screw is threadedly connected to the connecting seat, and the lower end of the first vertical adjusting screw is rotatably connected to the transverse plate, a first operating hand wheel is installed at the upper end of the first vertical adjusting screw, and at least one vertical guide rod is constructed on the transverse plate, and the upper end of the vertical guide rod movably passes through the connecting seat.

6. The method for preparing a Hall current sensor with strong anti-interference according to claim 2, characterized in that: The hot pressing film device comprises two vertical guide rail groups symmetrically installed on both sides of the assembly frame, and hot pressing film roller groups are symmetrically arranged between the two vertical guide rail groups and at the upper and lower ends of the Hall element belt, and each of the hot pressing film roller groups is transmission-connected to the two vertical guide rail groups.

7. The method for preparing a Hall current sensor with strong anti-interference according to claim 6, characterized in that: Each of the vertical guide rail groups includes two vertical guide rails spaced apart in the conveying direction of the Hall element belt, each of the hot pressing film roller groups includes two hot pressing rollers spaced apart in the conveying direction of the Hall element belt, each of the axial ends of the hot pressing rollers is rotatably connected to a sliding block via a second shaft, each of the sliding blocks is slidably connected to the corresponding vertical guide rail, a second vertical adjustment screw is rotatably connected to each sliding block, the second vertical adjustment screw is threadedly connected to the assembly frame, and a second operating hand wheel is installed at the end of the second vertical adjustment screw away from the sliding block, and a second operating hand wheel is installed at one axial end of a hot pressing roller A driving motor is provided, and second transmission wheels are respectively installed on the same side ends of the two hot pressing rollers, and the two second transmission wheels are connected by a transmission belt; and the rotation directions of the two hot pressing rollers arranged opposite to each other in the two hot pressing film roller groups are opposite; rolling wheels are respectively coaxially installed on the two second shafts of the hot pressing roller, and there are two Hall element belts, which are arranged opposite to each other, and the two pin parts of the two Hall element belts are close to each other, and the two semiconductor parts are far away from each other, the hot pressing roller is rolled on the corresponding end faces of the two pin parts, and the two rolling wheels are rolled on the corresponding end faces of the two semiconductor parts respectively.

8. The method for preparing a Hall current sensor with strong anti-interference according to claim 7, characterized in that: The hot pressing roller comprises a pressing roller body with a second electric heating wire built therein, a plurality of first assembly grooves are evenly opened on the circumferential surface of the pressing roller body along its circumferential direction, each of the first assembly grooves extends out of the two ends of the pressing roller body along the axial direction of the pressing roller body, a first operating port is respectively opened at the two axial ends of the pressing roller body, a plurality of first connecting holes are respectively opened on the pressing roller body and located at each first operating port, each of the first connecting holes is connected to the corresponding first assembly groove; a hot pressing strip or a sealing groove strip is installed in each first assembly groove, the hot pressing strip is hot pressed on the area between adjacent pins, and the outer end surface of the sealing groove strip is hot pressed on the end surface of the pin.

9. The method for preparing a Hall current sensor with strong anti-interference according to claim 2, characterized in that: The film cutting device includes two film cutting rollers symmetrically arranged at the upper and lower ends of the Hall element belt, and the axial ends of each of the film cutting rollers are rotatably connected to the two transfer arms through a third shaft rod, and one of the third shaft rods is connected to the power motor. The two transfer arms located on the same side of the two film cutting rollers are connected through a vertical adjustment rod, and a first threaded portion and a second threaded portion with opposite rotation directions are vertically spaced on the vertical adjustment rod. The first threaded portion and the second threaded portion are threadedly connected to the two transfer arms respectively, and the lower end of the vertical adjustment rod is rotatably connected to the assembly plate, and the upper end of the vertical adjustment rod is equipped with a third operating handwheel.

10. The method for preparing a Hall current sensor with strong anti-interference according to claim 9, characterized in that: The film cutting roller includes an annular cutting knife coaxially constructed in the middle of the knife roller body, a plurality of second assembly grooves uniformly arranged along the circumference of the knife roller body are respectively provided on the outer peripheral wall of the knife roller body and on both sides of the annular cutting knife, a second operating port is respectively provided at the axial ends of the knife roller body, a plurality of second connecting holes are provided on the knife roller body and at each second operating port, each of the second connecting holes is connected to the corresponding second assembly groove, a cutting knife strip is installed in each second assembly groove, the cutting knife strip cuts the area between adjacent pins, and the annular cutting knife cuts the area between two pin portions in two Hall element bands.

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