A method for charging and demagnetizing a magnetic latching relay with a built-in three-pole magnetic steel

Abstract

The present invention discloses a method and device for charging and demagnetizing a magnetic latching relay with a built-in three-pole magnetic steel. The method performs aging of the three-pole magnetic steel at high temperature, thereby ensuring the residual magnetism stability of the three-pole magnetic steel under high temperature conditions and reducing the possible magnetic pole deviation of the middle magnetic pole of the three-pole magnetic steel under high temperature conditions. The three-pole magnetic steel changes the originally disordered magnetic domain direction in the three-pole magnetic steel under the instantaneous strong magnetic field of the three-pole magnetic field (magnetic poles in opposite directions) so that the residual magnetism is arranged bidirectionally and symmetrically from the central plane of the magnetizing magnetic field and is permanently magnetized, so that the three-pole magnetic steel exhibits three-pole characteristics. Under the condition that the center line of the three-pole magnetic steel is located at the central symmetric plane of the magnetizing and demagnetizing magnetic field and the magnetizing magnetic field strengths on both sides are the same, the middle magnetic pole of the charging and demagnetizing effect is located at the exact center plane of the three-pole magnetic steel and the magnetic induction strengths of the end magnetic poles are the same or the difference is very small.

Description

Technical Field

[0001] The invention relates to a method and device for charging and demagnetizing a magnetic latching relay with built-in three-pole magnetic steel. Background Art

[0002] The magnetic latching relay is a new type of relay developed in recent years. It is an automatic switch. Like other electromagnetic relays, it automatically connects and disconnects the circuit. The difference is that the normally closed or normally open state of the magnetic latching relay is completely dependent on the action of the permanent magnet, and the switching state conversion is completed by triggering a pulse electrical signal of a certain width.

[0003] As one of the important components of the magnetic latching relay, the magnet needs to be charged and demagnetized when it is assembled into a magnetic latching relay. When the existing charging and demagnetization device is used to charge and demagnetize the magnet, the magnetic induction intensity of the magnet ends is greatly different, the holding force on both sides is greatly different, and the front and rear excitation action voltages are greatly different. Installing the magnet in this state in the magnetic circuit part of the magnetic latching relay causes unbalanced holding force at both ends of the magnetic circuit part, making the magnetic latching relay's environmental resistance and load resistance consistency poor.

[0004] When the magnetic holding relay is subjected to electrical life, vibration or impact test, the test will fail due to this difference. During the electrical life test, the contacts on one side will fail due to severe ablation while the other side will be normal. During the vibration or impact test, the side with less holding force will become confused and fail. Summary of the invention

[0005] One purpose of the present invention is to provide a method for charging and demagnetizing a magnetic latching relay with a built-in three-pole magnet. The method has a simple and convenient operation process. After magnetizing, the three-pole magnet exhibits three-pole magnetic characteristics and has strong magnetic stability. The middle magnetic pole of the three-pole magnet is just on the center line of the three-pole magnet. The magnetic induction intensity of the two end magnetic poles is consistent. It is fixed on the magnetic latching relay by riveting. The holding force of the circuits on both sides of the relay is well balanced, and the holding force difference between the front and rear excitation states of the magnetic latching relay is small.

[0006] The implementation method of the present invention is:

[0007] Step S01: magnetizing the three-pole magnetic steel through a three-pole magnetic field;

[0008] Step S02: The three-pole magnet is charged and demagnetized under a certain charging and demagnetization voltage condition. After charging and demagnetization, the magnetic induction intensity at the south pole position of the two ends of the three-pole magnet is tested. If the measured magnetic induction intensity should reach 260-300Gs, and the difference between the two sides is less than 20Gs, then step S03 is executed, otherwise step S05 is executed;

[0009] Step S03: aging the three-pole magnetic steel, taking out the three-pole magnetic steel after aging to check its magnetic induction strength, and installing the three-pole magnetic steel on the magnetic circuit part of the magnetic latching relay if the magnetic induction strength meets the specified value;

[0010] Step S04: After the armature is installed, the holding force of the armature end is tested, and one of the following steps is performed according to the test result:

[0011] 1) If there is a large deviation between the holding force and the predetermined index parameter of the product, determine whether the riveting gap is too large or there is excess material on the armature working surface. If so, adjust the riveting gap or process the armature working surface; if not, remove the installed three-pole magnet and repeat steps S01 to S04;

[0012] 2) If the holding force is within the predetermined parameter range of the product but the difference between the two ends is more than 0.5N, the installed three-pole magnet needs to be demagnetized on one side with two poles, and the side with greater holding force needs to be demagnetized;

[0013] Step S05: Re-magnetize and demagnetize the three-pole magnet for more than two times, and then test the magnetic induction intensity of the south pole position of the two ends of the three-pole magnet. The measured magnetic induction intensity should reach 260-300Gs, and the difference between the two sides is less than 20Gs, then execute step S03; otherwise, discard it.

[0014] Furthermore, before the three-pole magnetic steel is magnetized in step S01, the three-pole magnetic steel is not allowed to have any magnetism.

[0015] Furthermore, the step S03 is performed at a temperature of 160 to 300° C. for 10 to 36 hours.

[0016] Furthermore, in the step S04, when the three-pole magnetic steel is demagnetized on one side and two poles, the demagnetization voltage is gradually increased from 200Vd.c. The demagnetization voltage is gradually increased from 200Vd.c depending on the effect of the first demagnetization, so as to avoid the situation where the magnetic induction on the demagnetization side is too low due to the excessive demagnetization amount, that is, the magnetic holding force on the demagnetization surface is too small, which again leads to the reverse difference in holding force.

[0017] Another object of the present invention is to provide a magnetic latching relay charging and demagnetization device with a built-in three-pole magnetic steel, the device includes a charging and demagnetization machine and a three-pole charging and demagnetization clamp for fixing the three-pole magnetic steel, the charging and demagnetization machine includes a three-pole charging and demagnetization coil, the three-pole charging and demagnetization coil is installed in a three-pole charging and demagnetization coil housing, and a three-pole charging and demagnetization cavity is formed in the three-pole charging and demagnetization coil housing.

[0018] Furthermore, the three-pole charging and demagnetizing coil is a double-coil structure, and the double coils are wound in opposite directions; the difference in the number of turns of the double coils under the same winding wire diameter is no more than 8%. When the power is loaded on the three-pole charging and demagnetizing coil and discharged in the forward direction, the double coils generate a strong magnetic field with instantaneous opposite directions and symmetry to realize the three-pole magnetization of the magnetic three-pole steel, and the reverse discharge realizes the three-pole demagnetization. The three-pole demagnetization magnetic field and the magnetization magnetic field have the same magnetic induction intensity and direction under the same charging and demagnetization voltage.

[0019] Furthermore, the demagnetizing machine further comprises a two-pole demagnetizing coil, which is installed in a housing of the two-pole demagnetizing coil, and a two-pole demagnetizing cavity is formed in the housing of the two-pole demagnetizing coil. When the power is applied to the two-pole demagnetizing coil, the two-pole demagnetizing coil generates an instantaneous strong magnetic field to achieve demagnetization on the side opposite to the original magnetic field of the three-pole magnetic steel, while the side in the same direction as the original magnetic field of the three-pole magnetic steel remains unchanged when the demagnetization magnetic field is smaller than the original magnetic field of the three-pole magnetic steel, thereby achieving two-pole demagnetization; the three-pole magnetic steel is demagnetized for the second time by converting the demagnetization magnetic field direction by 180°, thereby achieving three-pole demagnetization.

[0020] Furthermore, the demagnetization device provided by the present invention further includes a switching switch, and the power supply is loaded on the three-pole demagnetization coil or the two-pole demagnetization coil via the switching switch. The switching of the three-pole demagnetization coil and the two-pole demagnetization coil is realized by the switching switch, thereby preventing the three-pole demagnetization coil and the two-pole demagnetization coil from being in working state at the same time.

[0021] Furthermore, when the two-pole demagnetization coil demagnetizes the three-pole magnetic steel, the three-pole magnetic steel is demagnetized outside the two-pole demagnetization coil, and the demagnetization voltage is less than or equal to 900 Vd.c.

[0022] Furthermore, an adjusting device is installed on the housing of the three-pole charging and demagnetizing coil.

[0023] The principle of the present invention is to age the three-pole magnetic steel at high temperature, thereby ensuring the residual magnetism stability of the three-pole magnetic steel under high temperature conditions and reducing the possible magnetic pole deviation of the middle magnetic pole of the three-pole magnetic steel under high temperature conditions.

[0024] Under the instantaneous strong magnetic field of the three-pole magnetic field (with opposite magnetic poles), the originally disordered magnetic domain direction in the three-pole magnet is changed to make it permanently magnetized by bidirectionally symmetrically arranging the residual magnetism from the center plane of the magnetizing magnetic field, so that the three-pole magnet exhibits three-pole characteristics. Under the condition that the center line of the three-pole magnet is located on the central symmetric plane of the charging and demagnetizing magnetic field and the magnetizing magnetic field strength on both sides is the same, the middle magnetic pole of the charging and demagnetizing effect is located on the center plane of the three-pole magnet and the magnetic induction strength of the end magnetic poles is the same or the difference is very small.

[0025] When the three-pole magnet is demagnetized in the three-pole demagnetization coil, it is subjected to the three-pole demagnetization magnetic field which is opposite to the direction of its internal residual magnetism, and the original arrangement direction of some of its internal magnetic domains is disrupted, so that they cancel each other out and demagnetize. If the three-pole demagnetization magnetic field is too large, all the arrangement directions of the magnetic domains will be completely disrupted, and the three-pole magnet will lose its magnetism. If the symmetrical center line of the original arrangement direction of the magnetic domains of the three-pole magnet is controlled by the demagnetization fixture on the center line of the demagnetization magnetic field of the three-pole demagnetization coil, and the demagnetization magnetic field strength lines on both sides of the demagnetization coil are the same and the amount of disrupting the arrangement direction of the magnetic domains is the same, so that the magnetic field demagnetization amount is the same, the magnetic induction intensity of the two poles of the three-pole magnet before demagnetization is not much different or the same, and the magnetic induction intensity on both sides of the magnet demagnetization effect is also very small.

[0026] The three-pole magnet is demagnetized in the two-pole demagnetization coil. The demagnetization position should be carried out in the external magnetic field of the demagnetization coil. The internal magnetic field cannot effectively adjust the demagnetization voltage due to the excessive magnetic induction intensity. The demagnetized side faces downward. Under the instantaneous strong magnetic field of the demagnetization coil, the magnetic domain arrangement direction of the three-pole magnet is opposite to the demagnetization field direction. The demagnetization principle is the same as the three-pole demagnetization principle. The magnetic domain arrangement direction is the same as the demagnetization field. Because the demagnetization field is much smaller than the magnetic field of the three-pole magnet itself, it will not be magnetized. Rotating the three-pole magnet 180° and demagnetizing it under the same demagnetization field can also demagnetize the other side, and the three-pole demagnetization is also achieved.

[0027] In the two-pole demagnetization coil, the demagnetization of the magnet is not allowed when the demagnetization voltage is set to more than 900Vd.c. inside the coil. Otherwise, the three-pole magnet will be magnetized on the same side as the demagnetization magnetic field due to excessive demagnetization on the side opposite to the demagnetization magnetic field, and the central symmetry of the magnetic pole will be destroyed. In severe cases, the three-pole magnet may become a two-pole magnet, losing its proper role in the relay.

[0028] Beneficial effects of the invention: The invention solves the problems that the middle magnetic pole of the original three-pole magnetic steel is not on the center line of the magnetic steel during charging and demagnetization, resulting in poor consistency of magnetic induction intensity of the end magnetic poles, the middle magnetic pole of the three-pole magnetic steel is offset during demagnetization, the demagnetization intensity of the two side magnetic poles is consistent, and the magnetic induction intensity of the end magnetic poles is greatly different. Repeated demagnetization and cumbersome charging and demagnetization operations, etc. If the product assembly consistency is well controlled, there is no need to repeatedly charge and demagnetize the same product.

[0029] By using this method for charging and demagnetization, the difference in magnetic holding force under the two states of holding force and action voltage in the pre-excitation and post-excitation states is effectively controlled to be less than 0.4N, and the difference in action voltage is controlled to be less than 8% of the rated voltage. The consistency of action voltage and magnetic holding force is well controlled, which is conducive to the consistency adjustment of other product parameters such as contact pressure and overtravel, and the consistency of product environmental adaptability and load resistance is significantly improved.

[0030] The demagnetization device provided by the present invention utilizes a three-pole demagnetization coil to demagnetize a three-pole magnetic steel, thereby ensuring that the middle magnetic pole of the three-pole magnetic steel is located on the center line of the magnetic steel and the magnetic induction intensity of the end magnetic poles is consistent.

[0031] By using a two-pole demagnetization coil, when the magnetic pole strengths at both ends of a three-pole magnetic steel are inconsistent, the side with greater strength can be demagnetized without affecting the side with lower strength, thus avoiding the tedious operation of repeatedly adjusting the three-pole demagnetization fixture for demagnetization due to the need to demagnetize one side of the three-pole magnetic steel.

[0032] The configuration of the two-pole demagnetization coil also realizes redundancy. When the three-pole charging and demagnetization coil fails to work, the two-pole demagnetization coil can realize the three-pole demagnetization.

[0033] The two-pole demagnetization fixture is used to fix the three-pole magnetic steel during the two-pole demagnetization, ensuring the consistency when demagnetizing one side of the three-pole magnetic steel.

[0034] The adjustment device is used to adjust the magnetizing and demagnetizing positions, so that the symmetrical center plane of the magnetizing magnetic field is exactly on the symmetrical center line of the magnetic steel to be demagnetized, further ensuring the consistency of magnetization. After the adjustment, a batch of magnetic steel to be demagnetized is magnetized and demagnetized, ensuring magnetization at the same position, thereby ensuring the consistency of the magnetization effect of the entire batch of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings herein are incorporated into and constitute a part of the specification, showing examples consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some examples of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0036] Figure 1 A schematic diagram of the structure of a charging and demagnetizing device provided in Example 1 of the present invention;

[0037] Figure 2 A cross-sectional view of the structure of the charging and demagnetizing device provided in Example 1 of the present invention;

[0038] Figure 3 A magnetization cross-sectional view of a magnetization and demagnetization device provided in Example 1 of the present invention;

[0039] Figure 4 It is a schematic diagram of the three-pole polarity after the three-pole magnetic steel is magnetized;

[0040] Figure 5 A cross-sectional view of a demagnetization device provided in Example 1 of the present invention;

[0041] Figure 6 A schematic diagram of the structure of a charging and demagnetizing device provided in Example 2 of the present invention;

[0042] Figure 7 It is a demagnetization cross-sectional view of a three-pole magnetic steel on a two-pole demagnetization coil;

[0043] Figure 8 A schematic diagram of the structure of a charging and demagnetizing device provided in Example 3 of the present invention;

[0044] Fig. 9 A schematic diagram of the structure of the two-pole demagnetization fixture provided by the present invention;

[0045] Fig.10 A schematic diagram of the structure of the three-pole charging and demagnetizing fixture provided by the present invention;

[0046] Fig.11 A schematic diagram of the structure of a three-pole charging and demagnetizing coil provided by the present invention;

[0047] In the accompanying drawings: 1- charging and demagnetizing machine, 2- three-pole charging and demagnetizing fixture, 3- three-pole charging and demagnetizing coil housing, 4- two-pole demagnetizing coil housing, 5- switching switch, 6- two-pole demagnetizing fixture, 7- adjusting device, 8- three-pole magnetic steel, 11- three-pole charging and demagnetizing coil, 12- two-pole demagnetizing coil, 13- operation interface, 14- switching knob, 21- second clamp body, 22- positioning block, 31- three-pole charging and demagnetizing cavity, 41- two-pole demagnetizing cavity, 61- fixing slot, 62- first clamp body, 71- adjusting screw, 72- nut, 211- magnetic steel slot. DETAILED DESCRIPTION

[0048] The illustrative examples will now be described more fully with reference to the accompanying drawings. However, the illustrative examples can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the disclosure will be comprehensive and complete and the concepts of the illustrative examples will be fully conveyed to those skilled in the art. In the drawings, the size of some elements may be exaggerated or deformed for clarity. The same reference numerals in the drawings represent the same or similar structures, and thus their detailed description will be omitted.

[0049] In addition, the described features, structures or characteristics can be combined in one or more examples in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the examples of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, elements, etc. can be adopted. In other cases, known structures, methods or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

[0050] The present invention provides a method for charging and demagnetizing a magnetic latching relay with a built-in three-pole magnetic steel, comprising the following steps:

[0051] Step S01: magnetizing the three-pole magnetic steel through a three-pole magnetic field;

[0052] Step S02: The three-pole magnet is charged and demagnetized under a certain charging and demagnetization voltage condition. After charging and demagnetization, the magnetic induction intensity at the south pole position of the two ends of the three-pole magnet is tested. If the measured magnetic induction intensity should reach 260-300Gs, and the difference between the two sides is less than 20Gs, then step S03 is executed, otherwise step S05 is executed;

[0053] Step S03: aging the three-pole magnetic steel, taking out the three-pole magnetic steel after aging to check its magnetic induction strength, and installing the three-pole magnetic steel on the magnetic circuit part of the magnetic latching relay if the magnetic induction strength meets the specified value;

[0054] Step S04: After the armature is installed, the holding force of the armature end is tested, and one of the following steps is performed according to the test result:

[0055] 1) If there is a large deviation between the holding force and the predetermined index parameter of the product, determine whether the riveting gap is too large or there is excess material on the armature working surface. If so, adjust the riveting gap or process the armature working surface; if not, remove the installed three-pole magnet and repeat steps S01 to S04;

[0056] 2) If the holding force is within the predetermined parameter range of the product but the difference between the two ends is more than 0.5N, the installed three-pole magnet needs to be demagnetized on one side with two poles, and the side with greater holding force needs to be demagnetized;

[0057] Step S05: Re-magnetize and demagnetize the three-pole magnet for more than two times, and then test the magnetic induction intensity of the south pole position of the two ends of the three-pole magnet. The measured magnetic induction intensity should reach 260-300Gs, and the difference between the two sides is less than 20Gs, then execute step S03; otherwise, discard it.

[0058] The method for charging and demagnetizing a magnetic latching relay with a built-in three-pole magnet provided by the present invention is illustrated herein by taking a three-pole magnet that is a rectangular symmetrical structure with two central axes of mounting bosses as an example. It can be understood that the shape of the three-pole magnet 8 is not a limitation to the technical solution claimed for protection by the present invention, and is within the scope of protection of the present invention within the scope understandable to those skilled in the art.

[0059] The three-pole magnetic field of the three-pole demagnetization coil 11 is used to magnetize so that the two protruding ends of the three-pole magnetic steel 8 are the electromagnetic north poles and the center line is the electromagnetic south pole. Figure 4As shown; before the three-pole magnetic steel 8 is magnetized, no incidental magnetism is allowed to occur, so as to avoid performance differences of the three-pole magnetic steel 8 after magnetization. Before being installed in the magnetic circuit, it needs to be stabilized and aged. The method of stabilizing and aging is as follows: the three-pole magnetic steel 8 is fixed and demagnetized in the demagnetization coil of the three-pole demagnetization machine with a demagnetization clamp. The demagnetization voltage is (200-300) Vd.c., and the magnetic induction intensity of the two magnetic poles (N) of the three-pole magnetic steel 8 is tested by a Gauss meter. The measured magnetic induction intensity should reach (260-300) Gs, and the difference between the two sides should not be greater than If the magnetic induction intensity of individual three-pole magnet steel 8 differs by more than 20Gs in the batches that are demagnetized under the same demagnetization conditions, the demagnetization should be repeated for more than two times. If the requirements are still not met, they should be discarded; the qualified products should be placed in a pre-set high-temperature oven, the temperature should be set to (160-300)℃, and the aging should be (10-36)h. After taking out, the magnetic induction intensity should be rechecked. If it is less than or greater than the specified value, the demagnetization and stable magnetic aging should be repeated. The qualified products should be matched with the tiny gap between the convex head and the pole shoe through the Riveted and fixed on the magnetic circuit part; in the actual operation process of charging and demagnetization test, because the magnetic induction intensity of the three-pole magnetic steel has large differences in test values ​​in different directions, the reading jump frequency is fast and sensitive, and the HOLD key of the Gauss meter needs to be pressed to obtain the maximum value during the test; after the armature is installed, the holding force of the armature end is tested with a dynamometer. If there is a large deviation between the holding force and the predetermined index parameters of the product, the product needs to be adjusted to see if the riveting gap is too large or there are excess objects on the working surface of the armature. If there is no such factor, the abnormal product needs to be re-charged and demagnetized. The specific charging and demagnetization voltage index is adjusted according to the actual difference of the product until the specified range of holding force is reached. If the holding force of individual products is within the range but the difference between the two ends is more than 0.5N, the product needs to be demagnetized on one side. For the demagnetization of the larger side, the demagnetization voltage starts from 200Vd.c, and the demagnetization voltage is gradually increased depending on the effect of the first demagnetization, so as to avoid the magnetic induction on the demagnetization side being too low due to excessive demagnetization, that is, the magnetic holding force on the demagnetization surface is too small, which leads to the reverse difference of holding force again.

[0060] The above-mentioned charging and demagnetization methods can be implemented by any device. Here, the following charging and demagnetization devices capable of implementing the above-mentioned charging and demagnetization methods are provided.

[0061] Example 1

[0062] The magnetic latching relay charging and demagnetizing device provided in this example includes a charging and demagnetizing machine 1 and a three-pole charging and demagnetizing fixture 2 for fixing a three-pole magnetic steel 8. The charging and demagnetizing machine 1 includes a three-pole charging and demagnetizing coil 11. The three-pole charging and demagnetizing coil 11 is installed in a three-pole charging and demagnetizing coil housing 3. A three-pole charging and demagnetizing cavity 31 is formed in the three-pole charging and demagnetizing coil housing 3. Figure 1 , Figure 2 shown.

[0063] The demagnetization device provided in this example can be used for magnetization or demagnetization. When used for magnetization, the three-pole magnetic steel 8 is placed in the three-pole demagnetization cavity 31, and the three-pole demagnetization coil 11 is powered. The magnetic field of the three-pole demagnetization coil 11 is as follows: Figure 3 As shown; the three-pole demagnetization coil 11 generates a strong magnetic field in opposite directions and symmetrically to realize the three-pole magnetization of the three-pole magnetic steel 8, and the magnetization is completed. After magnetization, the three-pole polarity of the three-pole magnetic steel 8 is as shown Figure 4 When used for demagnetization, the three-pole magnetic steel 8 is placed in the three-pole demagnetization cavity 31, and the three-pole demagnetization coil 11 is loaded with power, such as Figure 5 As shown, the three-pole demagnetization coil 11 generates an instantaneous symmetrical strong magnetic field which is opposite to the original magnetic field of the three-pole magnetic steel 8 and performs reverse magnetization to realize three-pole demagnetization.

[0064] The demagnetization principle of the demagnetization device provided in this example is as follows: the three-pole magnetic steel 8 is demagnetized in the three-pole demagnetization coil 11, and is subjected to a three-pole demagnetization magnetic field opposite to the direction of its internal residual magnetism, which disrupts the original arrangement direction of some of its internal magnetic domains so that they cancel each other out and demagnetize. If the three-pole demagnetization magnetic field is too large, it will completely disrupt the arrangement directions of all magnetic domains and cause the three-pole magnetic steel 8 to lose its magnetism. If the original magnetic domain arrangement direction of the three-pole magnetic steel 8 is symmetrically arranged on the demagnetization magnetic field center line of the three-pole demagnetization coil 11 through the control of the demagnetization fixture, and the demagnetization magnetic field strength lines on both sides of the demagnetization coil are the same and the amount of disrupting the magnetic domain arrangement direction is the same, so that the magnetic field demagnetization amount is the same, and the magnetic induction intensities of the two poles of the three-pole magnetic steel 8 before demagnetization are not much different or the same, the magnetic induction intensities on both sides of the three-pole magnetic steel 8 after demagnetization are also very small.

[0065] Example 2

[0066] The magnetic latching relay charging and demagnetizing device with built-in three-pole magnetic steel provided in this example includes all technical features of the magnetic latching relay charging and demagnetizing device with built-in three-pole magnetic steel provided in Example 1. The charging and demagnetizing device 1 in this example also includes a two-pole demagnetizing coil 12, which is installed in a two-pole demagnetizing coil housing 4, and a two-pole demagnetizing cavity 41 is formed in the two-pole demagnetizing coil housing 4, such as Figure 6 , Figure 7 shown.

[0067] The two-pole demagnetization coil 12 provided in this example is a general two-pole magnetic field demagnetization coil, and its interior is a single coil structure.

[0068] like Figure 7As shown, the demagnetization principle of the two-pole demagnetization coil 12 is: when the power is loaded on the two-pole demagnetization coil 12, the two-pole demagnetization coil 12 generates an instantaneous strong magnetic field to realize demagnetization on the side opposite to the original magnetic field direction of the three-pole magnetic steel 8, while the side in the same direction as the original magnetic field of the three-pole magnetic steel 8 remains unchanged when the demagnetization magnetic field is smaller than the original magnetic field of the three-pole magnetic steel 8, thereby realizing two-pole demagnetization. As long as the three-pole magnetic steel 8 is demagnetized for the second time by turning the demagnetization magnetic field direction 180°, three-pole demagnetization can be realized.

[0069] When the charging and demagnetizing device provided by the present invention is used for a whole batch of three-pole magnetic steels, when the magnetic pole strength of the two ends of individual three-pole magnetic steels is inconsistent, for the individual magnetic pole strength inconsistency at the two ends, it is only necessary to use the two-pole demagnetization coil 12 to perform two-pole demagnetization to make the strength consistent or with a small difference. In actual operation, the larger the side is, the smaller the adjustment amplitude of the demagnetization voltage is, the closer to the target value, until the required range is reached.

[0070] The three-pole magnetic steel 8 is demagnetized in the two-pole demagnetization coil 12. The demagnetization position should be carried out in the external magnetic field of the demagnetization coil. The internal magnetic field cannot effectively adjust the demagnetization voltage due to the excessive magnetic induction intensity. The demagnetized side faces downward, and under the action of the instantaneous strong magnetic field of the demagnetization coil, the magnetic domain arrangement direction of the three-pole magnetic steel is opposite to the demagnetization field direction, and the demagnetization principle is the same as the three-pole demagnetization principle. The magnetic domain arrangement direction is the same as the demagnetization magnetic field. Since the demagnetization magnetic field is much smaller than the magnetic field of the magnetic steel itself, it will not be magnetized.

[0071] In the two-pole demagnetization coil 12, the three-pole magnet is not allowed to be demagnetized when the demagnetization voltage is set to be more than 900Vd.c. inside the coil. Otherwise, the three-pole magnet will be magnetized on the side with the same direction of the demagnetization magnetic field due to excessive demagnetization on the side opposite to the demagnetization magnetic field, and the central symmetry of the magnetic pole will be destroyed. In severe cases, the magnetic pole of the three-pole magnet may become two-pole, and it will lose its due role in the relay.

[0072] Example 3

[0073] The magnetic latching relay charging and demagnetizing device with built-in three-pole magnetic steel provided in this example includes all the technical features of the magnetic latching relay charging and demagnetizing device with built-in three-pole magnetic steel provided in Example 2, and also includes a switching switch 5, and the power is loaded on the three-pole charging and demagnetizing coil 11 or the two-pole demagnetizing coil 12 through the switching switch 5, such as Figure 8 shown.

[0074] The switching switch 5 can adopt any existing one, and a single-pole double-throw switch is adopted here. The power is loaded on the three-pole charging and demagnetization coil 11 or the two-pole demagnetization coil 12 through the single-pole double-throw switch, avoiding the situation that the three-pole charging and demagnetization coil 11 and the two-pole demagnetization coil 12 are in working state at the same time, thereby extending the service life of the charging and demagnetization device.

[0075] In order to ensure that the magnetic steel to be demagnetized can be stable during the two-pole demagnetization process, based on Example 2 and Example 3, a two-pole demagnetization fixture 6 is further included, and the two-pole demagnetization fixture 6 is used to fix the three-pole magnetic steel 8 that needs to be demagnetized for two-pole demagnetization.

[0076] The two-pole demagnetization fixture 6 can be any existing one. The two-pole demagnetization fixture 6 used here includes a first fixture body 62 with a fixing groove 61, such as Fig. 9 shown.

[0077] like Figure 7 As shown, the two-pole demagnetization fixture 6 is used on the two-pole demagnetization coil 12, and its position is completely fixed and located outside the coil magnetic field. It demagnetizes the single-sided magnetic pole of the three-pole magnetic steel 8, so that it is fixed in the same position to ensure the consistency of the demagnetization magnetic field strength when the demagnetization voltage is the same; when it is used to demagnetize batch magnetic steel, after correction, there may be a situation where the action voltage of individual products is large on one side and small on the other side, and single-sided demagnetization is performed on the side with the large action voltage.

[0078] Example 4

[0079] The magnetic latching relay charging and demagnetizing device with built-in three-pole magnetic steel provided in this example includes all the technical features of the magnetic latching relay charging and demagnetizing device with built-in three-pole magnetic steel provided in Examples 1, 2 and 3. An adjusting device 7 is installed on the three-pole charging and demagnetizing coil housing 3, such as Figure 2 shown.

[0080] The adjusting device 7 can be any existing one, and the one used here includes an adjusting screw 71 and a nut 72, such as Figure 2 As shown. The charging and demagnetization positions are adjusted by adjusting the screw 71 so that the symmetric center plane of the charging and demagnetization magnetic field is just on the symmetric center line of the three-pole magnetic steel 8, and the nut 72 is fixed to ensure the consistency of the magnetization effect. When used for charging and demagnetizing a whole batch of magnetic steel, since the magnetization position is fixed, the whole batch of magnetic steel is magnetized and demagnetized at the same position.

[0081] The three-pole charging and demagnetizing fixture 2 described in Examples 1 to 4 includes a second clamp body 21 and a positioning block 22. The second clamp body 21 is provided with a magnetic steel groove 211 for fixing the three-pole magnetic steel. Fig.10 shown.

[0082] Combination Figure 2 , Fig.10 As shown, the positioning block 22 and the magnetic steel slot 211 in the three-pole charging and demagnetization fixture 2 cooperate to completely position the product in four directions of front, back, left and right. No manual positioning is required during the charging and demagnetization process, and the residual magnetic reaction force of the three-pole magnetic steel 8 during charging and demagnetization can be avoided, causing the three-pole magnetic steel 8 to jump out of the central plane range of the charging and demagnetization magnetic field, resulting in the deviation of the middle magnetic pole or the large difference in the magnetic induction intensity of the end magnetic pole.

[0083] like Fig.11 As shown, the three-pole demagnetization coil 11 in Examples 1 to 4 is a double-coil structure, the double coils are wound in opposite directions, and the difference in the number of turns of the double coils under the same winding wire diameter is no more than 8%. Of course, any other demagnetization coil structure is also possible.

[0084] The magnetizing and demagnetizing machine 1 disclosed herein can be any one, such as the GM29200 magnetizing and demagnetizing machine, which includes an operation interface 13, wherein the three-pole magnetizing and demagnetizing are switched by a switch knob 14 on the magnetizing machine's operation interface 13. By adjusting the current magnitude loaded on the three-pole magnetizing and demagnetizing coil 11 and the two-pole demagnetizing coil 12, step-by-step magnetizing and demagnetizing can be achieved.

[0085] The present disclosure has been described by the above-mentioned relevant examples, but the above-mentioned examples are only examples for implementing the present disclosure. It must be pointed out that the disclosed examples do not limit the scope of the present disclosure. On the contrary, changes and modifications made without departing from the spirit and scope of the present disclosure are all within the scope of patent protection of the present disclosure.

Claims

1. A method for charging and demagnetizing a magnetic latching relay with a built-in three-pole magnetic steel, characterized in that: The method comprises the following steps: Step S01: magnetizing the magnetic steel through a three-pole magnetic field to make it exhibit three-pole characteristics; Step S02: The three-pole magnet is charged and demagnetized under a certain charging and demagnetization voltage condition. After charging and demagnetization, the magnetic induction intensity at the south pole position of the two ends of the three-pole magnet is tested. If the measured magnetic induction intensity should reach 260-300Gs, and the difference between the two sides is less than 20Gs, then step S03 is executed, otherwise step S05 is executed; Step S03: aging the three-pole magnetic steel, taking out the three-pole magnetic steel after aging to check its magnetic induction strength, and installing the three-pole magnetic steel on the magnetic circuit part of the magnetic latching relay if the magnetic induction strength meets the specified value; Step S04: After the armature is installed, the holding force of the armature end is tested, and one of the following steps is performed according to the test result: 1) If there is a large deviation between the holding force and the predetermined index parameter of the product, determine whether the riveting gap is too large or there is excess material on the armature working surface. If so, adjust the riveting gap or process the armature working surface; if not, remove the installed three-pole magnet and repeat steps S01 to S04; 2) If the holding force is within the predetermined parameter range of the product but the difference between the two ends is more than 0.5N, the installed three-pole magnet needs to be demagnetized on one side with two poles, and the side with greater holding force needs to be demagnetized; Step S05: Re-magnetize and demagnetize the three-pole magnet for more than two times, and then test the magnetic induction intensity of the south pole position of the two ends of the three-pole magnet. The measured magnetic induction intensity should reach 260-300Gs, and the difference between the two sides is less than 20Gs, then execute step S03; otherwise, discard it.

2. The method for charging and demagnetizing a magnetic latching relay with a built-in three-pole magnetic steel according to claim 1, characterized in that: Before the step S01 magnetizes the three-pole magnetic steel, the three-pole magnetic steel is not allowed to have any magnetism.

3. The method for charging and demagnetizing a magnetic latching relay with built-in three-pole magnetic steel according to claim 1 or 2, characterized in that: The step S03 is performed at a temperature of 160 to 300° C. for 10 to 36 hours.

4. The method for charging and demagnetizing a magnetic latching relay with built-in three-pole magnetic steel according to claim 1 or 2, characterized in that: In the step S04 2), when the three-pole magnetic steel is subjected to single-sided two-pole demagnetization, the demagnetization voltage is gradually increased from 200 Vd.c.

5. The method for charging and demagnetizing a magnetic latching relay with built-in three-pole magnetic steel according to claim 1, characterized in that: The device used comprises a demagnetizing machine (1) and a three-pole demagnetizing fixture (2) for fixing three-pole magnetic steel, wherein the demagnetizing machine (1) comprises a three-pole demagnetizing coil (11), wherein the three-pole demagnetizing coil (11) is installed in a three-pole demagnetizing coil housing (3), and a three-pole demagnetizing cavity (31) is formed in the three-pole demagnetizing coil housing (3); the demagnetizing machine (1) also comprises a two-pole demagnetizing coil (12) for demagnetizing the three-pole magnetic steel, wherein the two-pole demagnetizing coil (12) is installed in a two-pole demagnetizing coil housing (4), and a three-pole demagnetizing cavity (31) is formed in the two-pole demagnetizing coil housing (4). The invention also comprises a switching switch (5), and the power source is loaded on the three-pole demagnetization coil (11) or the two-pole demagnetization coil (12) through the switching switch (5); when the two-pole demagnetization coil (12) demagnetizes the three-pole magnetic steel, the three-pole magnetic steel is demagnetized outside the two-pole demagnetization coil (12), and the demagnetization voltage is less than or equal to 900Vd.c.; and also comprises a two-pole demagnetization fixture (6); an adjusting device (7) is installed on the three-pole demagnetization coil housing (3); the three-pole demagnetization coil is a double-coil structure, and the two coils are wound in opposite directions.

Images