Self-locking relay

Abstract

The utility model belongs to the technical field of relays, and particularly relates to a self-locking relay, which solves the problem that the performance of the relay is influenced by mechanical wear, and comprises a coil and a moving magnet which are sleeved on the same iron core, the transmission mechanism is linked with the movable magnet; the normally-closed static contact is arranged on the first table board; the normally-open static contact is arranged on the second table board; the eccentric contact block is provided with a first inclined surface, a second inclined surface, a third inclined surface and a fourth inclined surface, the third inclined surface and the fourth inclined surface are respectively provided with a normally-closed movable contact and a normally-opened movable contact, and the eccentric contact block is driven by the transmission mechanism to push the first inclined surface or the second inclined surface to rotate along the pivot connecting point until the fourth inclined surface is in contact with the second table surface; the third inclined surface is in contact with the first table surface, so that the normally open contact group is closed, or the third inclined surface is in contact with the first table surface, so that the normally closed contact group is closed; the holding part provides a holding force; the return mechanism provides force for the moving magnet to return to the starting position. According to the utility model, stable contact switching can be realized, and the influence of mechanical wear on the performance of the relay is weakened.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a self-locking relay. Background Art

[0002] Electromagnetic relays play a vital role in electrical control systems. These relays typically consist of key components such as an iron core, a coil, an armature, and a contact spring. Their operating principle is based on the electromagnetic effect. When voltage is applied across the coil, the current flowing through it generates a magnetic field, which attracts the armature, forcing it into contact with the static contact (normally open contact), completing the circuit. Once the coil is de-energized, the electromagnetic force dissipates, and the spring forces the armature back into position, breaking the circuit. This process of engagement and release is the foundation of circuit control.

[0003] CN208570481U provides a self-locking relay, in which an armature is arranged on a support rod; when the electromagnetic part is powered off, one end of the armature is located above the electromagnetic part, and the other end of the armature is located on one side of the self-locking mechanism. The armature is a strip-shaped structure, and the upper and middle parts are connected to the support rod, so that the armature has a rod-rod structure with the connection point as the support point; when the electromagnetic part is powered on, one end of the armature is attracted to the electromagnetic part, and the other end of the armature controls the self-locking mechanism to be in a self-locking or unlocking state, so that when the electromagnetic part is powered off, the armature can separate the armature from the electromagnetic part under the action of gravity. The armature of the relay is used as a lever structure for switching the contact open or closed state, and mechanical wear may occur under long-term operation. Such wear may cause poor contact of the contacts, affecting the reliability and stability of the relay. Moreover, its opening or closing depends on the gravity of the armature. In some environments, gravity may not be sufficient to keep the armature stable, so that the contacts can be reliably closed or opened, further affecting the reliability and stability of the equipment.

[0004] Therefore, an improved self-latching relay is needed that can achieve stable contact closing or opening and weaken the influence of mechanical wear on relay performance. Utility Model Content

[0005] In order to solve the problem that the existing relay may produce mechanical wear during long-term operation and rely on the gravity of the armature, thus failing to ensure stable contact closure or disconnection, the embodiment of the utility model provides a self-locking relay that can achieve stable contact attraction or disconnection and weaken the impact of mechanical wear on relay performance.

[0006] In the first aspect, an embodiment of the present invention provides a self-locking relay, which includes: a coil and a moving magnet sleeved on the same iron core; a transmission mechanism connected to the moving magnet and configured to be linked with the moving magnet; a normally closed static contact arranged on the first table; a normally open static contact arranged on the second table; an eccentric contact block having a first inclined surface, a second inclined surface, a third inclined surface and a fourth inclined surface, the third inclined surface and the fourth inclined surface are respectively provided with a normally closed moving contact and a normally open moving contact, the eccentric contact block is provided with a pivot connection point, and the eccentric contact block is configured to be pushed by the transmission mechanism along the first inclined surface and the second inclined surface. The pivot connection point rotates until the fourth inclined surface contacts the second table surface, so that the normally open static contact and the normally open moving contact are closed, or the second inclined surface is pushed by the transmission mechanism and rotates along the pivot connection point until the third inclined surface contacts the first table surface, so that the normally closed moving contact and the normally closed static contact are closed; a retaining component connects the eccentric contact block and provides a retaining force to keep the third inclined surface in contact with the first table surface, or to keep the fourth inclined surface in contact with the second table surface; a return mechanism is connected to the moving magnet, and is used to provide a force for the moving magnet to return to the starting position.

[0007] Preferably, the transmission mechanism includes a slider and a guide rail; the guide rail is fixedly installed along a preset direction; the slider is slidably disposed in the guide rail and connected to the moving magnet.

[0008] Preferably, the transmission mechanism further includes a pin and an elastic limiting component provided on the slider, the elastic limiting component being connected to one end of the pin to limit the rotational movement of the pin around a fixed point within a certain range; when the fourth inclined surface contacts the second table surface, the end of the pin away from the elastic limiting component points to the second inclined surface; when the third inclined surface contacts the first table surface, the end of the pin away from the elastic limiting component points to the first inclined surface.

[0009] Preferably, the elastic limiting component includes a spring, one end of the spring is fixed to the slider, and the other end of the spring is connected to one end of the ejector pin.

[0010] Preferably, the eccentric contact block has axial symmetry, and the straight line connecting the intersection of the first inclined plane and the second inclined plane and the center of mass of the eccentric contact block is the axis of symmetry of the eccentric contact block; the pivot connection point is located on the axis of symmetry, and the distance between the intersection and the pivot connection point is smaller than the distance between the intersection and the center of mass; the third inclined plane is opposite to the first inclined plane, and the fourth inclined plane is opposite to the second inclined plane; the angle between the third inclined plane and the fourth inclined plane is an obtuse angle.

[0011] Preferably, the retaining component includes a torsion spring, one end of the torsion spring is connected to the base of the relay, and the other end of the torsion spring is connected to the eccentric component, and the connection point is located within the obtuse angle formed by the third inclined surface and the fourth inclined surface.

[0012] Preferably, the return mechanism includes a spring, and the spring acts on the moving magnet with a force opposite to the magnetic force generated by the coil.

[0013] Preferably, the relay further comprises a reset rod, which is movably mounted above the second inclined surface along a preset direction, and the reset rod is used to: when the reset rod moves along the preset direction, push the second inclined surface to cause the eccentric contact block to rotate along the pivot connection point until the third inclined surface contacts the first table surface, thereby closing the normally closed moving contact and the normally closed static contact.

[0014] Preferably, the relay further includes a reset circuit; the reset circuit includes a contact detection module,

[0015] The contact detection module is electrically connected to the normally closed static contact, the normally open static contact, the normally closed moving contact and / or the normally open moving contact, and is used to detect the opening and closing status of the normally closed static contact, the normally open static contact, the normally closed moving contact and / or the normally open moving contact; the reset circuit is electrically connected to the coil, and is used to control whether the coil is energized according to the opening and closing status.

[0016] Preferably, the relay further comprises a support plate and a base; the bracket is vertically mounted on the base; and the eccentric contact block is pivotally connected to the support plate.

[0017] In summary, the beneficial effects of the present invention are as follows: when the coil is energized, according to the principle of electromagnetic induction, a magnetic force is generated inside the coil, and the magnetic force acts on the moving magnet, causing it to move along the layout direction of the iron core, and the transmission mechanism is connected to the moving magnet. When the moving magnet moves, the transmission mechanism moves synchronously; the eccentric contact block is provided with a pivot connection point, and the pivot connection allows the eccentric contact block to rotate around a fixed point, and under the push of the transmission mechanism, the eccentric contact block can accurately rotate to a predetermined position; through the design of the eccentric contact block with a first inclined surface, a second inclined surface, a third inclined surface and a fourth inclined surface, the third inclined surface and the fourth inclined surface are respectively provided with a normally closed moving contact and a normally open moving contact, which can achieve fast and accurate contact and disconnection with the normally open static contact and the normally closed static contact. Each time the coil is energized, the eccentric contact block is pushed by the transmission mechanism on the first inclined surface and rotates along the pivot connection point until the fourth inclined surface contacts the second table surface, so that The normally open static contact is closed with the normally open moving contact, or the second inclined surface is pushed by the transmission mechanism and rotated along the pivot connection point until the third inclined surface contacts the first table surface, so that the normally closed moving contact is closed with the normally closed static contact, thereby achieving a self-locking or unlocking state. This design reduces the complex mechanical structure in traditional relays, such as multi-linkage mechanisms, thereby reducing the possibility of mechanical wear, and its pivot connection method has the characteristics of compact structure and flexible rotation, ensuring the stability of the eccentric contact during rotation; the holding component connects the eccentric contact block, provides sufficient holding force to ensure that the third inclined surface maintains contact with the first table surface, or provides holding force to keep the fourth inclined surface in contact with the second table surface, so that after the coil is de-energized, the eccentric contact block can still maintain its last state, without the need for long-term power-on maintenance, realizing the self-locking function, and can also reduce contact malfunction and mechanical wear caused by vibration or external impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work, and these are all within the scope of protection of the present invention.

[0019] Figure 1 Schematic diagram of the first stable state of the self-locking relay according to an embodiment of the present invention.

[0020] Figure 2 It is a front view of the self-locking relay according to an embodiment of the present utility model.

[0021] Figure 3 It is a right side view of the self-locking relay according to an embodiment of the present utility model.

[0022] Figure 4 It is a left side view of the self-locking relay according to an embodiment of the present utility model.

[0023] Figure 5 Schematic diagram of the second stable state of the self-latching relay according to an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the position of the ejector pin when pushing the second inclined surface according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

[0026] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0027] Example 1

[0028] like Figure 1 As shown, the embodiment of the present invention provides a self-locking relay, which includes an iron core arranged along a preset direction, a coil, a moving magnet 100, a transmission mechanism, an eccentric contact block, a pair of normally open contacts and a pair of normally closed contacts, a holding component, and a return mechanism.

[0029] Coil( Figure 1 (not shown), generates magnetic force when power is applied.

[0030] The coil can be arranged at any feasible position. For example, the coil can be fixed on the iron core by winding.

[0031] The moving magnet 100 moves along a preset direction under the action of magnetic force.

[0032] The preset direction may refer to a vertical direction of the relay when the relay is placed horizontally.

[0033] The relay can be equipped with guide rails, sliders, bearings, and other components to enable the moving magnet 100 to move in a predetermined direction under the influence of magnetic force. For example, a cylindrical sliding structure, such as an iron core wound with a coil, is provided along the predetermined direction. The cylindrical moving magnet is sleeved onto the sliding structure. When the coil is energized to generate magnetic force, the moving magnet is attracted or repelled by the magnetic force, driving the slider to move along the predetermined direction of the sliding structure.

[0034] The transmission mechanism is connected to the moving magnet 100 and moves synchronously with the moving magnet 100. The transmission mechanism can be implemented in various feasible ways, such as directly connected to the moving magnet 100 through a connecting rod, a rigid rod, etc., so that the transmission mechanism can move synchronously with the movement of the moving magnet 100.

[0035] In some embodiments, the transmission mechanism includes a slider 210 and a guide rail 220 ; the guide rail 220 is fixedly installed along a preset direction; the slider 210 is slidably disposed in the guide rail and connected to the moving magnet 100 .

[0036] The relay may include a base and its corresponding supporting mechanism for mounting or supporting other mechanisms or components of the relay. For example, the relay may include a bracket 800, a supporting plate ( Figure 1 (not shown in the figure), the bracket 800 is vertically mounted on the base 900. The guide rail 220 can be fixedly mounted on the bracket 800 along a preset direction (vertical direction). The slider 210 can be connected to the moving magnet 100 through a connecting rod, a rigid rod, etc.

[0037] In some embodiments, the transmission mechanism further includes a pin 230 and an elastic limiting component 240 provided on the slider 210 . The elastic limiting component 240 is connected to one end of the pin 230 to limit the rotational movement of the pin 230 around a fixed point within a certain range.

[0038] The elastic limiting component 240 can be a spring, one end of which is fixed to the slider 210, and the other end of which is fixed to one end of the ejector pin 230. The ejector pin 230 is pivotally connected to the slider 210. For example, the middle portion of the ejector pin 230 has a pivot hole, and the ejector pin 230 is rotatably mounted on the slider 210 via a pivot pin. The end of the ejector pin 230 away from the spring can be used to push the eccentric contact block 300. At the starting position (when the coil is not energized and the moving magnet and transmission mechanism have not yet moved vertically downward), it can be considered that Figure 1 The moving magnet and the transmission mechanism are kept at the starting position. For the convenience of the following description, Figure 1The position or state of the eccentric contact block is referred to as the first stable state. Under the action of gravity and the spring, the ejector pin 230 remains in a vertical downward direction, pointing toward the rotation axis 330 of the eccentric contact block 300. When the eccentric contact block 300 is pushed, the ejector pin 230 may rotate to a certain extent due to the interaction. However, due to the limiting action of the spring, the ejector pin 230 stops rotating when it reaches the limit position.

[0039] The eccentric contact 300 has a first inclined surface 310 and a second inclined surface 320. It is provided with a pivot connection point, which is fixed to the support plate via a rotating shaft 330, thereby achieving a pivotal connection between the eccentric contact 300 and the support plate. The rotating shaft 330 provides a rotational fulcrum for the eccentric contact 300. Each time the coil is energized, the transmission mechanism alternately pushes on one of the first inclined surface 310 and the second inclined surface 320, causing the eccentric contact 300 to rotate about the rotating shaft 330 between two stable positions.

[0040] In some embodiments, as Figure 2 As shown, the eccentric contact block 300 also includes a third inclined surface 340 and a fourth inclined surface 350; the eccentric contact block has axial symmetry, and the straight line connecting the intersection 360 of the first inclined surface and the second inclined surface and the center of mass 370 of the eccentric contact block is the symmetry axis of the eccentric contact block; the rotation axis is located on the symmetry axis, and the distance between the intersection 360 and the rotation axis 330 is smaller than the distance between the intersection 360 and the center of mass 370; the third inclined surface 340 is opposite to the first inclined surface 310, and the fourth inclined surface 350 is opposite to the second inclined surface 320; the angle between the third inclined surface 340 and the fourth inclined surface 350 is an obtuse angle.

[0041] The third inclined surface 340 and the fourth inclined surface 350 may be flat surfaces, or surfaces with a certain curvature or bend.

[0042] A pair of normally open contacts 400 and a pair of normally closed contacts 500, when the eccentric contact block 300 is maintained in one of the two stable positions, the pair of contacts located at the stable position is closed, and the other pair of contacts is open.

[0043] In some embodiments, a first table 910 and a second table 920 are further provided on the base 900 of the relay; one of a pair of normally closed contacts is provided on a third inclined surface; the other contact 510 of a pair of normally closed contacts is provided on the first table 910; one of a pair of normally open contacts 420 is provided on a fourth inclined surface; the other contact 410 of a pair of normally open contacts is provided on the second table 920.

[0044] After the coil is energized, if the ejector pushes the first inclined surface 310, the eccentric contact block 300 rotates around the rotation axis 330, and the fourth inclined surface 350 contacts the second table surface 920 to form a stable position, a pair of normally open contacts closes, and a pair of normally closed contacts opens.

[0045] After the coil is energized, if the ejector pushes the second inclined surface 320, the eccentric contact block 300 rotates around the rotation axis 330, and the third inclined surface 340 contacts the first table 910 to form another stable position, the pair of normally closed contacts closes, and the pair of normally open contacts opens.

[0046] The holding member 600 is connected to the eccentric contact block 300 and provides a holding force to keep the eccentric contact block 300 in one of the two stable positions when the eccentric contact block 300 rotates to the position.

[0047] In some embodiments, the retaining component 600 includes a torsion spring, one end of which is connected to the base 900 of the relay, and the other end of which is connected to the eccentric component 300 , with the connection point located within the obtuse angle formed by the third inclined surface 340 and the fourth inclined surface 350 .

[0048] The return mechanism is connected to the moving magnet 100. When the coil is powered off, the moving magnet 100 and the transmission mechanism return to the starting position. In some embodiments, the return mechanism includes a first spring 700. The first spring 700 acts on the moving magnet with a force opposite to the magnetic force. Figure 3 As shown, the return mechanism may further include a bent lever structure 710, the angle formed by the two ends of the lever structure is an obtuse angle. The top of the slider 210 may be connected to one end of the lever structure 710, the other end of the lever structure 710 is tilted downward, and the bent portion of the lever structure is pivotally connected to the support mechanism. When the coil is de-energized, the slider 210 can return to the starting position under the elastic force of the first spring 700 and the gravity of the lever structure 710. Figure 4 As shown, the return mechanism 700 may further include a second spring 720 , one end of the second spring 720 being connected to the downwardly inclined end of the lever structure 710 , and the other end of the second spring 720 being fixedly connected to the support mechanism.

[0049] The principle of this utility model is described in detail as follows:

[0050] At the starting position, the ejector pin 230 maintains a vertical downward direction under the action of gravity and the spring, pointing to the rotation axis 330 of the eccentric contact block 300. At the same time, in the first stable state, due to the action of the retaining component 600, the third inclined surface 340 of the eccentric contact block 300 contacts the first table surface 910, and since the rotation axis 330 of the eccentric contact block 300 is set between the intersection 360 (i.e., a sharp corner of the eccentric contact block) and the center of mass 510, the center of mass 510 does not completely coincide with the rotation axis 330, forming an "eccentric" state. Therefore, the end of the ejector pin 230 close to the eccentric contact block 300 is located on the left side of the first inclined surface 310, that is, the end of the ejector pin 230 close to the eccentric contact block 300 directly points to the first inclined surface 310, rather than to the second inclined surface 320. At this time, if the coil is energized, the moving magnet 100 moves vertically downward under the action of the magnetic force, and the ejector pin 230 moves downward synchronously with the slider 210. When it touches the first inclined surface 310 of the eccentric contact block 300, due to the interaction between the ejector pin 230 and the first inclined surface 310, the ejector pin 230 will rotate to a certain extent in the clockwise direction. Due to the limiting effect of the spring, the ejector pin 230 will no longer rotate when it rotates to the limit angle, but driven by the slider 210, the ejector pin 230 continues to rotate at the limit angle. The eccentric contact 300 moves vertically downward, pushing the first inclined surface 310 of the eccentric contact 300. The eccentric contact 300 rotates counterclockwise around the rotating shaft 330. When the rotating position passes the dead point position of the retaining component 600, the power supply of the coil can be disconnected. Under the torsional force of the retaining component 600, the eccentric contact 300 will continue to rotate until the fourth inclined surface 350 contacts the second table 920, forming a stable position. A pair of normally open contacts 400 are closed, and a pair of normally closed contacts 500 are disconnected. The state of the relay at this time can be described as the second stable state. Since the power supply of the coil is disconnected, the moving magnet 100 and the transmission mechanism return to the starting position under the action of the return mechanism 700. At this time, the states of each mechanism and component are as follows. Figure 5 Indicated by the dotted line.

[0051] In the second stable state, since the moving magnet 100 and the transmission mechanism have returned to the starting position, the ejector 230 maintains a vertical downward direction under the action of gravity and the spring, pointing to the rotation axis 330 of the eccentric contact block 300. At the same time, in the second stable state, due to the action of the retaining component 600, the fourth inclined surface 350 of the eccentric contact block 300 contacts the second table surface 920, and since the rotation axis 330 of the eccentric contact block 300 is set between the intersection 360 (i.e., a sharp corner of the eccentric contact block) and the center of mass 510, the center of mass 510 does not completely coincide with the rotation axis 330, forming an "eccentric" state. Therefore, the end of the ejector 230 close to the eccentric contact block 300 is located to the right of the second inclined surface 320, that is, the end of the ejector 230 close to the eccentric contact block 300 directly points to the second inclined surface 320, rather than the first inclined surface 310. At this time, if the coil is energized, the moving magnet 100 moves vertically downward under the action of the magnetic force, and the ejector pin 230 moves downward synchronously with the slider 210. When it touches the second inclined surface 320 of the eccentric contact block 300, the ejector pin 230 will generate a certain degree of rotation in the counterclockwise direction due to the interaction between the ejector pin 230 and the second inclined surface 320. Figure 6 As shown by the dashed line, due to the limiting action of the spring, ejector pin 230 stops rotating at its extreme angle. However, driven by slider 210, ejector pin 230 continues to move vertically downward at its extreme angle, pushing second inclined surface 320 of eccentric contact 300, causing eccentric contact 300 to rotate clockwise about rotation axis 330. When the rotation position exceeds the dead center position of retaining member 600, the power supply to the coil can be disconnected. Under the torsional force of retaining member 600, eccentric contact 300 continues to rotate until third inclined surface 340 contacts first table 910, forming a stable position. The pair of normally open contacts 400 opens, and the pair of normally closed contacts 500 closes. At this point, the relay returns to the first stable state. With the power supply to the coil disconnected, the moving magnet 100 and the transmission mechanism return to their starting position under the action of the return mechanism.

[0052] The utility model realizes a self-locking or unlocking state based on the above principle. This design reduces the complex mechanical structure in the traditional relay, such as the multi-linkage mechanism, thereby reducing the possibility of mechanical wear, and its pivot connection mode has the characteristics of compact structure and flexible rotation, ensuring the stability of the eccentric contact during the rotation process; the holding component connects the eccentric contact and provides sufficient holding force to ensure that the third inclined surface maintains contact with the first table surface, or provides holding force to keep the fourth inclined surface in contact with the second table surface, so that after the coil is de-energized, the eccentric contact can still maintain its last state without the need for long-term power-on maintenance, thus realizing the self-locking function and reducing contact malfunction and mechanical wear caused by vibration or external impact.

[0053] Furthermore, the present invention eliminates the need to change the positive and negative wiring when the coil is energized, automatically switching the normally closed and normally open contacts of the relay each time power is applied, thereby improving the product's usability. By implementing a self-locking function, the present invention eliminates the need to keep the coil energized for extended periods of time, thereby reducing power consumption, reducing coil heating and winding insulation aging, and extending the coil's service life. The reduced coil energization time correspondingly reduces electromagnetic interference.

[0054] Considering that the self-locking relay can maintain the stable state when it was last powered on, and the stable state when it was last powered on may not be the default initial state of the relay (for example, the default initial state is the first stable state), therefore when the state of the relay cannot be determined when it is used for the first time, after multiple switches, or when it has not been used for a long time, in order to enable the relay to reach a known stable state, the utility model is provided with a reset function, which is described in detail below.

[0055] In some embodiments, the relay further includes a reset rod, which is movably mounted above the second inclined surface along a preset direction. When the reset rod moves along the preset direction, it pushes the second inclined surface, causing the eccentric contact to rotate around the rotation axis from a current stable position to another stable position.

[0056] Reference again Figure 1 The reset rod 901 is movably mounted above the second inclined surface 320 in the vertical direction. The movement of the reset rod can be controlled manually or by a related control circuit (such as a reset button, a motor electrically connected to the reset button, a microcontroller connected to the motor, a reset rod connected to the output end of the motor, etc.). If the relay is in the second stable state at this time, when the reset rod moves downward in the vertical direction, it pushes the second inclined surface 320, causing the eccentric contact 300 to rotate from the current stable position to another stable position around the rotation axis 330, or after rotating from the current stable position to a position beyond the dead point, it continues to rotate to another stable position under the torsional force of the retaining component 600, thereby returning the relay to the known first stable state, thereby resetting the relay. If the relay is in the first stable state at this time, when the reset rod moves downward in the vertical direction, it will not change the existing first stable state of the relay.

[0057] In some embodiments, the relay also includes a reset circuit; the reset circuit includes a contact detection module, the contact detection module is electrically connected to a pair of normally open contacts and / or a pair of normally closed contacts, and is used to detect the opening and closing status of a pair of normally open contacts and / or a pair of normally closed contacts; the reset circuit is electrically connected to the coil, and is used to control whether the coil is energized according to the opening and closing status.

[0058] The contact detection module may include mechanical, photoelectric, magnetoelectric sensors, etc. to detect the open and closed states of normally open contacts or normally closed contacts.

[0059] The reset circuit may also include a control circuit for detecting whether the contact state is consistent with the expected default initial state. For example, when the contact state is inconsistent with the expected default initial state, the reset process is initiated through the control circuit, such as turning on the power supply of the coil to energize the coil and control the relay to return from the second stable state to the first stable state; when it is detected that the contact state is consistent with the expected default initial state, no operation is performed. The relevant control method can be implemented by referring to the software control logic in the prior art.

[0060] The utility model provides a reset rod or a reset circuit. Regardless of whether the relay is used for the first time, after multiple switching, or has not been used for a long time, the reset rod or the reset circuit can be used to return the relay to a known, preset stable state (such as the first stable state), thereby greatly improving the reliability and predictability of the relay in use. By providing both manual and automatic reset methods such as the reset rod or the reset circuit, reset can be achieved by manually operating the reset rod, or the reset circuit can be used to automatically detect the contact state and trigger the reset process, thereby adapting to different application scenarios and operational requirements.

[0061] It should be understood that the present invention is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, detailed descriptions of known methods are omitted. In the above embodiments, several specific components, mechanisms, and related operating steps are described and illustrated as examples. It should also be noted that the present invention is not limited to the aforementioned components, mechanisms, units, parts, and their connections, or to their use through the aforementioned operating steps.

[0062] The above description is only a specific embodiment of the present invention. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here. It should be understood that the scope of protection of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the scope of protection of the present invention.

Claims

1. A self-locking relay, characterized in that: The relay comprises: A coil and a moving magnet sleeved on the same iron core; a transmission mechanism connected to the moving magnet and configured to be linked with the moving magnet; A normally closed static contact provided on the first table; A normally open static contact provided on the second table; an eccentric contact block having a first inclined surface, a second inclined surface, a third inclined surface, and a fourth inclined surface, wherein a normally closed moving contact and a normally open moving contact are respectively provided on the third inclined surface and the fourth inclined surface, and the eccentric contact block is provided with a pivot connection point, and the eccentric contact block is configured to be pushed by the transmission mechanism to rotate along the pivot connection point until the fourth inclined surface contacts the second table surface, so that the normally open static contact and the normally open moving contact are closed, or to be pushed by the transmission mechanism to rotate along the pivot connection point until the third inclined surface contacts the first table surface, so that the normally closed moving contact and the normally closed static contact are closed; a retaining component, connected to the eccentric contact block and providing a retaining force to keep the third inclined surface in contact with the first table surface, or to keep the fourth inclined surface in contact with the second table surface; The return mechanism is connected to the moving magnet and is used to provide a force for the moving magnet to return to the starting position.

2. The relay according to claim 1, wherein: The transmission mechanism includes a slider and a guide rail; The guide rail is fixedly installed along a preset direction; The slider is slidably disposed in the guide rail and connected to the moving magnet.

3. The relay according to claim 2, characterized in that The transmission mechanism further includes an ejector pin and an elastic limiting component provided on the slider. The elastic limiting component is connected to one end of the ejector pin to limit the rotational movement of the ejector pin around a fixed point within a certain range; when the fourth inclined surface contacts the second table surface, the end of the ejector pin away from the elastic limiting component points to the second inclined surface; when the third inclined surface contacts the first table surface, the end of the ejector pin away from the elastic limiting component points to the first inclined surface.

4. The relay according to claim 3, characterized in that The elastic limiting component includes a spring, one end of the spring is fixed on the slider, and the other end of the spring is connected to one end of the ejector pin.

5. The relay according to claim 3, characterized in that The eccentric contact block has axisymmetry, and the straight line connecting the intersection of the first inclined surface and the second inclined surface and the center of mass of the eccentric contact block is the symmetry axis of the eccentric contact block; The pivot connection point is located on the axis of symmetry, and the distance between the intersection and the pivot connection point is less than the distance between the intersection and the center of mass; The third inclined surface is opposite to the first inclined surface, and the fourth inclined surface is opposite to the second inclined surface; An included angle between the third inclined surface and the fourth inclined surface is an obtuse angle.

6. The relay according to claim 5, characterized in that The holding component includes a torsion spring, one end of which is connected to the base of the relay, and the other end of which is connected to the eccentric component, with the connection point being located within the obtuse angle formed by the third inclined surface and the fourth inclined surface.

7. The relay according to any one of claims 1 to 6, characterized in that: The return mechanism includes a spring that acts on the moving magnet with a force opposite to the magnetic force generated by the coil.

8. The relay according to any one of claims 1 to 6, characterized in that: The relay further includes a reset rod, which is movably mounted above the second inclined surface in a preset direction. The reset rod is configured to push the second inclined surface when the reset rod moves in the preset direction, causing the eccentric contact to rotate along the pivot connection point until the third inclined surface contacts the first table surface, thereby closing the normally closed moving contact and the normally closed static contact.

9. The relay according to any one of claims 1 to 6, characterized in that: The relay further includes a reset circuit; the reset circuit includes a contact detection module, The contact detection module is electrically connected to the normally closed static contact, the normally open static contact, the normally closed movable contact and / or the normally open movable contact, and is used to detect the open and closed states of the normally closed static contact, the normally open static contact, the normally closed movable contact and / or the normally open movable contact; The reset circuit is electrically connected to the coil and is used to control whether the coil is energized according to the open and close state.

10. The relay according to any one of claims 1 to 6, characterized in that: The relay also includes a support plate and a base; The bracket is vertically mounted on the base; The eccentric contact block is pivotally connected to the support plate.

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