An electromagnetic switch

Abstract

The present invention discloses an electromagnetic switch, which includes a shell, a cover plate, a fixed electromagnet, a movable electromagnet and a locking coil. A sleeve is vertically fixed in the middle of the shell, a fixed electromagnet is fixed at the inner bottom of the sleeve, and a movable electromagnet is slidably inserted on the upper part of the sleeve. The iron core of the movable electromagnet is arranged correspondingly to the iron core of the fixed electromagnet. Advantages: 1. The polarity characteristics of the electromagnet are utilized to achieve rapid attraction or disconnection of the movable electromagnet, thereby improving the reliability of equipment operation; 2. By setting special structures such as the second mandrel, the card plate, the third reset spring, and the support block, it is ensured that sparking and arcing phenomena will not occur during the closing process; in the disconnection process, arcing phenomena are avoided during separation; 3. The setting of the locking coil, the first mandrel and the locking structure ensures the energy saving of the electromagnetic switch and the reliability of the actuator.

Description

Technical field:

[0001] The invention relates to the technical field of electromagnetic switches, in particular to an electromagnetic switch. Background technology:

[0002] The existing electromagnetic switches generally use the coil to energize to close the upper and lower iron cores. During the closing process, the iron core must overcome the resistance of the reset spring, which causes the closing speed of the iron core to decrease. When in use, the contactor is generally in a closed state for a long time, causing the shock-absorbing spring and the opening spring to be in an energy storage state for a long time. This type of electromagnetic switch has the following problems when in use: 1. In order to maintain the closure, the electromagnetic coil is always in an energized state, which consumes a lot of energy. This not only reduces the service life of the electromagnetic coil, but also keeps the temperature of the electromagnetic coil at a high level, causing the electromagnetic coil to age very quickly, seriously affecting the electromagnet's suction force and closing speed. Therefore, the contactor electromagnet coil is also commonly burned; 2. After the contactor has been running for a period of time, the spring performance decreases, the coil is de-energized when released, and is automatically reset by the reset spring, the disconnection speed is greatly reduced, and the contact position is very prone to contact arcing, which greatly reduces the life of the upper and lower contacts. Summary of the invention:

[0003] An object of the present invention is to provide an electromagnetic switch with high reliability.

[0004] The present invention is implemented by the following technical scheme: an electromagnetic switch, which includes a shell, a cover plate, a fixed electromagnet, a movable electromagnet and a locking coil, a sleeve is vertically fixed in the middle of the shell, the fixed electromagnet is fixed to the inner bottom of the sleeve, the movable electromagnet is slidably inserted inside the sleeve above the fixed electromagnet, and the iron core of the movable electromagnet is arranged correspondingly to the iron core of the fixed electromagnet; the top end of the iron core of the movable electromagnet extends to the top of the sleeve, a locking rod is vertically fixed to the top of the iron core of the movable electromagnet, cantilevers are fixed on both sides of the iron core of the movable electromagnet outside the sleeve, and a locking rod is fixed between the cantilever and the sleeve. There is a first return spring; a moving contact is fixed under each of the cantilevers, and static contacts corresponding to the moving contacts above and below are fixed inside the shell outside the sleeve, and the moving contact is in active contact with the corresponding static contact; the cover plate is fixed on the top of the shell, and a accommodating cavity is arranged inside the cover plate corresponding to the locking rod; the locking coil is fixed inside the accommodating cavity, and a first core shaft is slidably inserted inside the locking coil, an armature is fixed on the top of the first core shaft, and a second return spring is sleeved on the outside of the first core shaft between the armature and the locking coil; a locking structure is arranged between the bottom end of the first core shaft and the locking rod.

[0005] Furthermore, a vertically arranged through hole is opened on each of the cantilevers, a second core shaft is inserted and slidably inserted in the through hole, a clamping plate is fixed on the top end of the second core shaft, and the moving contact is fixed on the bottom end of the second core shaft; a third return spring is sleeved on the outside of the second core shaft below the cantilever.

[0006] Furthermore, at least one support block is provided on the top side of the through hole, the middle part of the support block is hinged to the cantilever, the support block rotates vertically around the hinge point, and the clamping plate is in sliding contact with the end of the adjacent support block; a limit rod fixed to the cantilever is provided below one end of the support block adjacent to the through hole, and the bottom end of the support block is in movably contact with the limit rod; a fourth return spring is fixed between the bottom of the other end of the support block and the cantilever, and a top rod in movably contact with the top of the other end of the support block is fixed to the bottom of the cover plate.

[0007] Furthermore, the locking structure includes a claw, a connecting rod and a tension spring, the locking coil is arranged above the locking rod and coaxially with the locking rod; at least one L-shaped claw is vertically arranged on the side of the locking rod, and a fixed shaft fixed to the inner wall of the accommodating cavity is rotatably provided in the middle of the claw; a slot corresponding to the bottom end of the claw is opened at the top of the locking rod, and the bottom end of the claw is movably engaged in the inside of the slot; a connecting rod for driving the claw to rotate is connected between the bottom end of the first core shaft and the top end of the claw.

[0008] Furthermore, it includes two claws, a tension spring is connected between the top ends of the two claws, a positioning rod corresponding to the claws is fixed on the inner wall of the accommodating cavity between the first core shaft and the locking rod, and the fixed shaft is arranged parallel to the positioning rod; one end of the connecting rod is hinged to the bottom end of the first core shaft, a long hole is arranged in the middle of the connecting rod, and the connecting rod is sleeved on the outside of the positioning rod through the long hole; the other end of the connecting rod is in sliding contact with the inner wall of the adjacent claw.

[0009] Furthermore, the locking structure includes a pin hole, the locking coil is arranged on one side of the locking rod, and the locking coil is arranged vertically relative to the locking rod, a pin hole is opened on the locking rod, and the bottom end of the first core shaft is movably inserted into the pin hole.

[0010] Furthermore, it also includes a power supply, one end of the power supply is electrically connected to one end of the locking coil through a switch K0, and the other end of the locking coil is electrically connected to the other end of the power supply through a wire; one end of the power supply is electrically connected to one end of the coil of the fixed electromagnet through a switch K1, and the other end of the coil of the fixed electromagnet is connected to the other end of the power supply through a wire; one end of the power supply is electrically connected to one end of the coil of the movable electromagnet through a switch K2, and the other end of the coil of the movable electromagnet is electrically connected to the other end of the power supply through a switch K3; one end of the power supply is electrically connected to the other end of the coil of the movable electromagnet through a switch K4, and one end of the coil of the movable electromagnet is electrically connected to the other end of the power supply through a switch K5.

[0011] Furthermore, a slot hole corresponding to the first return spring is opened at the top end of the sleeve, and the bottom end of the first return spring is fixedly connected to the bottom of the slot hole.

[0012] Advantages of the present invention:

[0013] 1. By using the polarity characteristics of the electromagnet and applying the same or reverse voltage to the fixed electromagnet and the movable electromagnet, the movable electromagnet can be quickly closed or disconnected, thereby improving the reliability of equipment operation;

[0014] 2. By setting up special structures such as the second mandrel, the clamping plate, the third reset spring, and the support block, during the pull-in process, the moving contact and the static contact are ensured to close quickly and the closing pressure of the contacts is gradually increased, ensuring that no sparking or arcing occurs during the closing process; during the disconnection process, the pressure added to the closing of the upper and lower contacts will not be released, but will be quickly disconnected from the static contact along with the active electromagnet until it returns to the upper starting point and the pressure of the third reset spring is released under the control of the ejector rod, so that the upper contact is reset, avoiding arcing during separation;

[0015] 3. The arrangement of the locking coil, the first core shaft and the locking structure ensures the energy saving of the electromagnetic switch and the reliability of the actuator, namely: 1) the locking structure is used to ensure the reliable operation of the mechanism in the working state, and the power consumption is extremely small, which is truly energy-saving; 2) when a sudden power failure occurs, the second return spring will use its own structural characteristics to quickly open the locking structure, thereby quickly opening the moving contact and the static contact, and safety is advantageously guaranteed. Description of the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0017] Figure 2 for Figure 1 A partial enlarged view of .

[0018] Figure 3for Figure 1 Schematic diagram of the closed state.

[0019] Figure 4 This is a schematic diagram of the overall structure of Example 2.

[0020] Figure 5 for Figure 4 Enlarged view of local A.

[0021] Figure 6 for Figure 4 Enlarged view of local B.

[0022] Figure 7 for Figure 4 Schematic diagram of the closed state.

[0023] Figure 8 for Figure 7 A partial enlarged view of .

[0024] Fig. 9 This is a circuit diagram of Example 3.

[0025] Shell 1, cover plate 2, accommodating chamber 2.1, fixed electromagnet 3, movable electromagnet 4, locking coil 5, sleeve 6, slot 6.1, locking rod 7, cantilever 8, through hole 8.1, first return spring 9, moving contact 10, static contact 11, first spindle 12, armature 13, second return spring 14, locking structure 15, claw 15.1, connecting rod 15.2, long hole 15.2.1, tension spring 15.3, fixed shaft 15.4, slot 15.5, positioning rod 15.6, pin hole 15.7, second spindle 16, card plate 17, third return spring 18, support block 19, limit rod 20, fourth return spring 21, push rod 22, power supply 23. Specific implementation method:

[0026] In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] Example 1: Figures 1 to 3As shown, an electromagnetic switch comprises a housing 1, a cover plate 2, a fixed electromagnet 3, a movable electromagnet 4 and a locking coil 5. The housing 1 comprises an intermediate housing and a bottom plate fixed at the bottom thereof by bolts, so as to facilitate disassembly and maintenance; a sleeve 6 is vertically fixed in the middle of the housing 1, a fixed electromagnet 3 is fixed at the inner bottom of the sleeve 6, a movable electromagnet 4 is slidably inserted in the sleeve 6 above the fixed electromagnet 3, a slide groove is arranged on the inner wall of the sleeve 6, and a slider (slide groove and slide) sliding along the slide groove is fixed on the outer wall of the coil protective cover of the movable electromagnet 4 The movable electromagnet 4 is ensured to slide along the sleeve 6 in a directional manner (not shown in the block diagram); the iron core of the movable electromagnet 4 is arranged correspondingly to the iron core of the fixed electromagnet 3 up and down, and when the coil of the movable electromagnet 4 and the coil of the fixed electromagnet 3 are supplied with current in the same direction, the adjacent magnetic poles of the iron cores of the two electromagnets are attracted to each other with opposite polarities, and the movable electromagnet 4 moves downward under the action of the suction force; when the coil of the movable electromagnet 4 and the coil of the fixed electromagnet 3 are supplied with current in opposite directions, the adjacent magnetic poles of the iron cores of the two electromagnets are repelled with the same polarities, and the movable electromagnet 4 moves upward under the action of the reaction force;

[0028] The top end of the iron core of the movable electromagnet 4 extends to the top of the sleeve 6, and a locking rod 7 is vertically fixed on the top of the iron core of the movable electromagnet 4. Cantilevers 8 are fixed on both sides of the iron core of the movable electromagnet 4 outside the sleeve 6. A first reset spring 9 is fixed between the cantilever 8 and the sleeve 6. A slot 6.1 corresponding to the first reset spring 9 is opened at the top of the sleeve 6, and the bottom end of the first reset spring 9 is fixedly connected to the bottom of the slot 6.1; a moving contact 10 is fixed under each cantilever 8, and a static contact 11 corresponding to the moving contact 10 is fixed inside the housing 1 outside the sleeve 6. The moving contact 10 is in active contact with the corresponding static contact 11. When the movable electromagnet 4 moves downward until the iron core fits the iron core of the fixed electromagnet 3, the moving contact 10 is in contact and conduction with the static contact 11, and the first reset spring 9 accumulates force; when the movable electromagnet 4 moves upward, the first reset spring 9 is released to assist in pushing the cantilever 8 upward, thereby accelerating the separation of the moving contact 10 from the static contact 11;

[0029] A cover plate 2 is fixed on the top of the housing 1, and a receiving chamber 2.1 is arranged inside the cover plate 2 corresponding to the locking rod 7, and the receiving chamber 2.1 can accommodate the locking coil 5 and the locking rod 7; a locking coil 5 is fixed inside the receiving chamber 2.1, and a first core shaft 12 is slidably inserted inside the locking coil 5, and an armature 13 is fixed on the top of the first core shaft 12, and a second return spring 14 is sleeved on the outside of the first core shaft 12 between the armature 13 and the locking coil 5; a locking structure 15 is arranged between the bottom end of the first core shaft 12 and the locking rod 7, and the lock is locked by the locking structure. The rod 7 is locked; the locking structure 15 includes a pin hole 15.7, the locking coil 5 is arranged on one side of the locking rod 7, and the locking coil 5 is arranged vertically relative to the locking rod 7, a pin hole 15.7 is opened on the locking rod 7, and the bottom end of the first spindle 12 is movably inserted into the pin hole 15.7; after the movable electromagnet 4 moves downward into position, the pin hole 15.7 and the first spindle 12 just correspond; when the locking coil 5 is energized, a magnetic force is generated to attract the armature 13 downward, the second return spring 14 is compressed, and the first spindle 12 just inserts into the pin hole 15.7, thereby achieving the purpose of locking the locking rod 7;

[0030] The specific working process is as follows:

[0031] (1) In the non-operating state, the distance between the moving contact 10 and the stationary contact 11 is smaller than the distance between the movable electromagnet 4 and the fixed electromagnet 3.

[0032] (2) When closing is required, firstly, the movable electromagnet 4 and the fixed electromagnet 3 are connected to the same direction voltage, so that the movable electromagnet 4 has an N pole at the upper end and an S pole at the lower end, and the fixed electromagnet 3 has an N pole at the upper end and an S pole at the lower end. Under the effect of the attraction between opposite poles, the movable electromagnet 4 and the movable electromagnet 4 together with the moving contact 10 move downward rapidly, and the first return spring 9 is compressed. At this time, the locking coil 5 is energized, the armature 13 moves to the right, the second return spring 14 is compressed, the first core shaft 12 is inserted into the pin hole 15.7 and locked, and the locking coil 5 is energized with a small current to maintain the closing process.

[0033] (3) When disconnection is required, the locking coil 5 is first de-energized. The armature 13 pulls the first core shaft 12 to the left under the action of the second reset spring 14 and is pulled out of the locking position of the locking rod 7 through the pin hole 15.7. The movable electromagnet 4 is switched to the upper reverse voltage, and the fixed electromagnet 3 is energized without changing the direction. In this way, the movable electromagnet 4 has an S pole at the upper end and an N pole at the lower end, while the fixed electromagnet 3 still maintains an N pole at the upper end and an S pole at the lower end. In this way, according to the principle of like poles repelling each other and under the reset action of the first reset spring 9, the movable electromagnet 4 moves upward rapidly together with the moving contact 10 to complete the disconnection process.

[0034] When a sudden power outage occurs, the locking coil 5 loses power, and the armature 13 pulls the first core shaft 12 to the left under the action of the second reset spring 14, and is pulled out of the locking position of the locking rod 7 through the pin hole 15.7. Under the reset action of the first reset spring 9, the movable electromagnet 4 moves rapidly upward together with the moving contact 10 to complete the disconnection process.

[0035] Embodiment 2: Its overall structure is the same as that of Embodiment 1, except that Figures 4 to 8 As shown, the locking structure 15 includes a claw 15.1, a connecting rod 15.2 and a tension spring 15.3, the locking coil 5 is arranged above the locking rod 7 and is coaxial with the locking rod 7; at least one L-shaped claw 15.1 is vertically arranged on the side of the locking rod 7, and a fixed shaft 15.4 fixed to the inner wall of the accommodating chamber 2.1 is rotatably provided in the middle of the claw 15.1, and a slot 15.5 corresponding to the bottom end of the claw 15.1 is opened on the top side wall of the locking rod 7, and the bottom end of the claw 15.1 is movably connected to the inside of the slot 15.5; this embodiment includes two claws 15.1, and a tension spring 15.3 is connected between the top ends of the two claws 15.1; a positioning rod 15.6 corresponding to the claw 15.1 is fixed on the inner wall of the accommodating chamber 2.1 between the first spindle 12 and the locking rod 7, and the fixed shaft 15.4 is arranged parallel to the positioning rod 15.6;

[0036] A connecting rod 15.2 for driving the claw 15.1 to rotate is connected between the bottom end of the first mandrel 12 and the top end of the claw 15.1; the two ends of the connecting rod 15.2 can be hinged to the top end of the claw 15.1 and the bottom end of the first mandrel 12 respectively (not shown in the figure), or as shown in the present embodiment, one end of the connecting rod 15.2 is hinged to the bottom end of the first mandrel 12, a long hole 15.2.1 is provided in the middle of the connecting rod 15.2, and the connecting rod 15.2 is sleeved on the outside of the positioning rod 15.6 through the long hole 15.2.1; the other end of the connecting rod 15.2 is in sliding contact with the inner wall of the adjacent claw 15.1;

[0037] A vertical through hole 8.1 is provided on each cantilever 8, a second core shaft 16 is inserted and slidably inserted in the through hole 8.1, a clamping plate 17 is fixed on the top of the second core shaft 16, and the moving contact 10 is fixed on the bottom of the second core shaft 16; a third reset spring 18 is sleeved on the outer side of the second core shaft 16 below the cantilever 8; at least one support block 19 is provided on the top side of the through hole 8.1, and in this embodiment, two support blocks 19 are symmetrically arranged about the through hole 8.1; the middle part of the support block 19 is hinged to the cantilever 8, the support block 19 rotates vertically around the hinge point, and the clamping plate 17 rotates with the adjacent The end of the support block 19 is in sliding contact; a limit rod 20 fixed to the cantilever 8 is arranged below one end of the support block 19 adjacent to the through hole 8.1, and the bottom end of the support block 19 is in movably contact with the limit rod 20; a fourth reset spring 21 is fixed between the bottom of the other end of the support block 19 and the cantilever 8, and the fourth reset spring 21 is a torsion spring; a top rod 22 is fixed at the bottom of the cover plate 2 and is in movably contact with the top of the other end of the support block 19; specifically, a countersunk hole is opened at the top of the through hole 8.1, and the support block 19 is hingedly arranged inside the countersunk hole by a pivot, and the limit rod 20 and the fourth reset spring 21 are both fixed in the countersunk hole.

[0038] The specific working process is as follows:

[0039] (1) In the non-operating state, the distance between the moving contact 10 and the stationary contact 11 is smaller than the distance between the movable electromagnet 4 and the fixed electromagnet 3.

[0040] (2) When closing is required, first connect the movable electromagnet 4 and the fixed electromagnet 3 to the same voltage, so that the movable electromagnet 4 has an N pole at the upper end and an S pole at the lower end, and the fixed electromagnet 3 has an N pole at the upper end and an S pole at the lower end. Under the effect of the attraction between opposite poles, the movable electromagnet 4 and the movable electromagnet 4 together with the support block 19, the limit rod 20, the second core shaft 16, the third reset spring 18 and the movable contact 10 move downward rapidly, and the first reset spring 9 is compressed. During the high-speed downward movement, the movable contact 10 and the static contact 11 are closed first. During the continued downward movement, the third reset spring 18 is compressed, so that the moving contact 10 and the static contact 11 increase the closing pressure (thereby avoiding the occurrence of contact ablation due to insufficient contact pressure). The second core shaft 16 pushes one end of the support block 19 to rotate upward, and the third reset spring 18 is compressed. When it continues to move downward and completes the closure, the clamping plate 17 at the top of the second core shaft 16 detaches from the support block 19, and one end of the support block 19 is in the fourth reset spring 9. 21 rotates downward and stops under the action of the limit rod 20; at this time, the locking coil 5 is energized, the armature 13 moves downward, the second return spring 14 is compressed, the first spindle 12 pushes the connecting rod 15.2 to rotate around the positioning rod 15.6, and the connecting rod 15.2 rotates while pushing the claw 15.1 to rotate. The end of the claw 15.1 is locked into the locking position in the locking groove 15.5 of the locking rod, and the two connecting rods 15.2 enter the dead point position in a straight line, and the locking coil 5 is energized with a small current to complete the closing process.

[0041] (3) When disconnection is required, the locking coil 5 is first de-energized. The armature 13 pulls the first spindle 12 upward under the action of the second return spring 14, destroying the dead points of the two connecting rods 15.2, causing the connecting rods 15.2 to move upward and rotate. The claw 15.1 rotates under the action of the tension spring 15.3 and leaves the locking position of the locking rod 7. The movable electromagnet 4 is switched to the upper reverse voltage, and the fixed electromagnet 3 is energized without changing the direction. In this way, the movable electromagnet 4 has an S pole at the upper end and an N pole at the lower end, while the fixed electromagnet 3 still maintains an N pole at the upper end and an S pole at the lower end. In this way, according to the principle of like poles repelling each other and the first Under the resetting action of the resetting spring 9, the movable electromagnet 4 together with the support block 19, the limit rod 20, the second core shaft 16, the third resetting spring 18 and the moving contact 10 move upward rapidly. During the high-speed upward movement, the clamping plate 17 is dragged by the support block 19, and the third resetting spring 18 cannot be released (to quickly separate the moving contact 10 from the static contact 11 and avoid arcing during separation). During the continued upward movement, the push rod 22 triggers the other end of the support block 19 to rotate downward, the clamping plate 17 is disengaged from the support block 19, and the second core shaft 16 moves downward and resets under the action of the third resetting spring 18, completing the disconnection process.

[0042] (4) When a sudden power outage occurs, the locking coil 5 loses power. The armature 13 pulls the first spindle 12 upward under the action of the second return spring 14, destroying the dead point of the two connecting rods 15.2, causing the connecting rod 15.2 to move upward and rotate. The claw 15.1 rotates and leaves the locking position of the locking rod 7 under the action of the tension spring 15.3. Under the reset action of the first return spring 9, the movable electromagnet 4 together with the support block 19, the limit rod 20, the second spindle 16, the third return spring 18 and the moving contact 10 move upward rapidly. During the high-speed upward movement, the clamping plate 17 is dragged by the support block 19, and the third return spring 18 cannot be released (to quickly separate the moving contact 10 from the static contact 11 to avoid arcing during separation). During the continued upward movement, the push rod 22 triggers the other end of the support block 19 to rotate downward, the clamping plate 17 is separated from the support block 19, and the second spindle 16 moves downward and resets under the action of the third return spring 18, completing the disconnection process.

[0043] Embodiment 3: Its overall structure is the same as that of Embodiment 2, except that Fig. 9 As shown, it also includes a power supply 23, one end of the power supply 23 is electrically connected to one end of the locking coil 5 through a switch K0, and the other end of the locking coil 5 is electrically connected to the other end of the power supply 23 through a wire; one end of the power supply 23 is electrically connected to one end of the coil of the fixed electromagnet 3 through a switch K1, and the other end of the coil of the fixed electromagnet 3 is connected to the other end of the power supply 23 through a wire; one end of the power supply 23 is electrically connected to one end of the coil of the movable electromagnet 4 through a switch K2, and the other end of the coil of the movable electromagnet 4 is electrically connected to the other end of the power supply 23 through a switch K3; one end of the power supply 23 is electrically connected to the other end of the coil of the movable electromagnet through a switch K4, and one end of the coil of the movable electromagnet is electrically connected to the other end of the power supply 23 through a switch K5.

[0044] In this embodiment, one end of the power supply is the positive pole and the other end is the negative pole; the specific closing and opening transition operations are as follows:

[0045] (1) Closing process: Switch K1, switch K2, and switch K3 are closed, and the fixed electromagnet 3 and the movable electromagnet 4 obtain voltage in the same direction. The upper end of the iron core of the fixed electromagnet 3 is the N pole and the lower end is the S pole, and the upper end of the iron core of the movable electromagnet 4 is the N pole and the lower end is the S pole. In this way, the upper end of the fixed electromagnet 3 and the lower end of the movable electromagnet 4 are opposite in polarity and attract each other. The movable electromagnet 4 moves downward, and the fixed electromagnet 3 and the movable electromagnet 4 are closed and reach the lower starting point; switch K0 is closed, the locking coil 5 is energized, and the locking structure 15 is locked. Switch K1, switch K2, and switch K3 are opened, and the fixed electromagnet 3 and the movable electromagnet 4 are de-energized. Switch K0 remains closed with a small current, and the attraction process is completed.

[0046] (2) Disconnection process: switch K0 is disconnected, locking coil 5 loses power, locking structure 15 opens, switches K1, K5 and K4 are closed, the coil of fixed electromagnet 3 and the coil of movable electromagnet 4 obtain opposite voltages, the upper end of fixed electromagnet 3 is N pole and the lower end is S pole, the upper end of movable electromagnet 4 is S pole and the lower end is N pole, so that the upper end of fixed electromagnet 3 and the lower end of movable electromagnet 4 have the same polarity and repel each other, movable electromagnet 4 moves upward, fixed electromagnet 3 and movable electromagnet 4 separate and reach the upper starting point, switches K1, K5 and K4 are disconnected, fixed electromagnet 3 and movable electromagnet 4 are de-energized, and the disconnection process is completed.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electromagnetic switch, characterized in that: It includes a shell, a cover plate, a fixed electromagnet, a movable electromagnet and a locking coil. A sleeve is vertically fixed in the middle of the shell, the fixed electromagnet is fixed at the inner bottom of the sleeve, the movable electromagnet is slidably inserted inside the sleeve above the fixed electromagnet, and the iron core of the movable electromagnet is correspondingly arranged up and down with the iron core of the fixed electromagnet; the top of the iron core of the movable electromagnet extends to the top of the sleeve, a locking rod is vertically fixed on the top of the iron core of the movable electromagnet, cantilevers are fixed on both sides of the iron core of the movable electromagnet outside the sleeve, and a locking rod is fixed between the cantilever and the sleeve. A first return spring is fixed; a moving contact is fixed under each of the cantilever arms, and a static contact corresponding to the moving contact above and below is fixed inside the shell outside the sleeve, and the moving contact is in active contact with the corresponding static contact; the cover plate is fixed on the top of the shell, and a receiving cavity is provided inside the cover plate corresponding to the locking rod; the locking coil is fixed inside the receiving cavity, and a first core shaft is slidably inserted inside the locking coil, an armature is fixed on the top of the first core shaft, and a second return spring is sleeved on the outside of the first core shaft between the armature and the locking coil; A locking structure is provided between the bottom end of the first spindle and the locking rod; a vertical through hole is provided on each of the cantilevers, a second spindle is inserted and slidably inserted in the through hole, a clamping plate is fixed on the top end of the second spindle, and the moving contact is fixed to the bottom end of the second spindle; a third reset spring is sleeved on the outside of the second spindle under the cantilever; one end of the power supply is electrically connected to one end of the locking coil through the switch K0, and the other end of the locking coil is electrically connected to the other end of the power supply through a wire; one end of the power supply is electrically connected to one end of the coil of the fixed electromagnet through the switch K1, The other end of the fixed electromagnet coil is connected to the other end of the power supply through a wire; one end of the power supply is electrically connected to one end of the coil of the movable electromagnet through a switch K2, and the other end of the coil of the movable electromagnet is electrically connected to the other end of the power supply through a switch K3; one end of the power supply is electrically connected to the other end of the coil of the movable electromagnet through a switch K4, and one end of the coil of the movable electromagnet is electrically connected to the other end of the power supply through a switch K5; a slot hole corresponding to the first return spring is provided at the top end of the sleeve, and the bottom end of the first return spring is fixedly connected to the bottom of the slot hole.

2. An electromagnetic switch according to claim 1, characterized in that: At least one support block is arranged on the top side of the through hole, the middle part of the support block is hinged to the cantilever, the support block rotates vertically around the hinge point, and the clamping plate is in sliding contact with the end of the adjacent support block; a limit rod fixed to the cantilever is arranged below one end of the support block adjacent to the through hole, and the bottom end of the support block is in movably contact with the limit rod; a fourth return spring is fixed between the bottom of the other end of the support block and the cantilever, and a top rod in movably contact with the top of the other end of the support block is fixed to the bottom of the cover plate.

3. An electromagnetic switch according to any one of claims 1 to 2, characterized in that: The locking structure includes a claw, a connecting rod and a tension spring. The locking coil is arranged above the locking rod and coaxially with the locking rod. At least one L-shaped claw is vertically arranged on the side of the locking rod, and a fixed shaft fixed to the inner wall of the accommodating cavity is rotatably provided in the middle of the claw. A slot corresponding to the bottom end of the claw is opened at the top of the locking rod, and the bottom end of the claw is movably engaged in the inside of the slot. A connecting rod for driving the claw to rotate is connected between the bottom end of the first core shaft and the top end of the claw.

4. An electromagnetic switch according to claim 3, characterized in that: It includes two claws, a tension spring is connected between the top ends of the two claws, a positioning rod corresponding to the claws is fixed on the inner wall of the accommodating cavity between the first core shaft and the locking rod, and the fixed shaft is arranged parallel to the positioning rod; one end of the connecting rod is hinged to the bottom end of the first core shaft, a long hole is arranged in the middle of the connecting rod, and the connecting rod is sleeved on the outside of the positioning rod through the long hole; the other end of the connecting rod is in sliding contact with the inner wall of the adjacent claw.

5. An electromagnetic switch according to any one of claims 1 to 2, characterized in that: The locking structure includes a pin hole. The locking coil is arranged on one side of the locking rod, and the locking coil is arranged vertically relative to the locking rod. A pin hole is opened on the locking rod, and the bottom end of the first core shaft is movably inserted into the pin hole.

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