High-life electromagnetic pin-pulling switch module

Abstract

The present invention belongs to the technical field of electromagnetic unlocking devices, and particularly relates to a long-life electromagnetic pull-out switch module, comprising a signal switch assembly, characterized in that the signal switch assembly includes a microswitch and an overvoltage protection drive assembly, the microswitch being disposed below a static iron core, the button of the microswitch being disposed upward, a limit step corresponding to the annular boss being disposed on the inner wall of the central hole of the static iron core, the limit step being located below the annular boss, a trigger gap being provided between the limit step and the annular boss, the outer diameter of the limit nut being smaller than the inner diameter of the blind hole, the outer diameter of the drive ring being larger than the inner diameter of the blind hole, the return spring being concentric with the transmission spring and being sleeved on the outside of the transmission spring, the lower end face of the return spring abutting the static iron core, and the upper end faces of the transmission spring and the return spring both abutting the bottom surface of the drive ring. The switch module of the present invention has the advantages of reliable operation, small size, and flexible networking.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic unlocking devices, and in particular relates to a long-life electromagnetic pull-out type switch module. Background Art

[0002] The electromagnetic pull-out switch module can be used in the locking and isolation mechanism of explosive devices, and can also be used in the mechanisms with safety locking requirements of electronic systems in aerospace, aviation, weapons, ships, etc. Figure 6 The existing electromagnetic pull-out switch module uses an electromagnet assembly to drive the locking pin to unlock the relevant isolation mechanism. The movement of the locking pin triggers the action of the signal switch assembly, and the signal switch assembly outputs an electrical signal to the outside. Under the action of the return spring in the electromagnet assembly, the locking pin resets and locks the relevant isolation mechanism again. The existing signal switch assembly adopts a lateral sliding contact method. The static reed 11 is tightly pressed against the side of the combination button 12 under the action of elastic force. The locking pin and the combination button 12 are linked. During the reciprocating motion of the locking pin, the friction between the reed 11 and the combination button 12 will cause the contact surface to wear, affecting the life of the electromagnetic switch. Since the reed 11 is also responsible for conducting current, the reed 11 and the electrical contact are worn to a certain extent and the resistance is abnormal, causing the electromagnetic assembly to work abnormally and unable to achieve the unlocking action, resulting in the risk of model mission failure. In addition, the signal switch assembly structure of this lateral sliding contact method is large in size, and multiple switch assemblies cannot be installed at the same time. The output circuit switch signal is single. Summary of the Invention

[0003] The object of the present invention is to provide a long-life electromagnetic pull-out pin switch module with reliable operation, small size, flexible networking, so as to overcome the difficulties existing in the prior art.

[0004] The technical solution for achieving the above-mentioned purpose includes the following contents.

[0005] A long-life electromagnetic pull-out switch module includes a housing, a vertical locking pin, an electromagnet assembly arranged in the housing, and a signal switch assembly. The electromagnet assembly is arranged above the signal switch assembly. The electromagnet assembly includes an electromagnetic coil and a moving iron core and a static iron core in the center thereof, and a return spring arranged between the moving and static iron cores. The return spring is connected to a tension adjustment mechanism. The moving and static iron cores are provided with a central through hole. The locking pin is fixedly installed in the central hole of the moving iron core. Under the action of the return spring, the upper end of the locking pin protrudes outside the housing. The signal switch assembly includes a micro switch and an overvoltage protection drive assembly.

[0006] The micro switch is arranged below the static iron core, and the button of the micro switch is arranged upward.

[0007] The anti-overpressure drive assembly includes a vertical core rod and a transmission spring. The core rod is movably installed in the central hole of the static iron core with its middle part. The top end surface of the core rod faces the blind hole provided on the bottom end surface of the locking pin. The bottom end surface of the core rod abuts the top end of the button of the micro switch. An annular boss is provided on the outer wall of the middle part of the core rod. A limiting step corresponding to the annular boss is provided on the inner wall of the central hole of the static iron core. The limiting step is located below the annular boss. A trigger gap is provided between the limiting step and the annular boss. The transmission spring is sleeved on the upper part of the core rod. The lower end surface of the transmission spring abuts the top end surface of the annular boss.

[0008] The tension adjustment mechanism includes a limit nut and a drive ring movably mounted on the core rod. The limit nut is screwed onto the external thread on the top of the core rod. The outer diameter of the limit nut is smaller than the inner diameter of the blind hole, and the outer diameter of the drive ring is larger than the inner diameter of the blind hole. The recoil spring is concentric with the transmission spring and is mounted on the outside of the transmission spring. The lower end face of the recoil spring abuts the static iron core, and the upper end faces of the transmission spring and the recoil spring abut the bottom face of the drive ring.

[0009] Furthermore, the spiral directions of the transmission spring and the return spring are opposite, which improves the stability of the telescopic movement of the two springs.

[0010] Furthermore, a travel adjustment ring for adjusting the trigger gap is screwed onto the bottom end of the core rod, and the bottom surface of the travel adjustment ring abuts against the top of the micro switch button. The travel adjustment ring can adjust the initial trigger gap size to improve the working reliability of the micro switch button.

[0011] Furthermore, the edge of the stroke adjustment ring is provided with an anti-slip pattern, which facilitates the rotation of the stroke adjustment ring.

[0012] Furthermore, the switch assembly includes two micro switches, which can realize multiple different circuit forms.

[0013] When the above-mentioned high-life electromagnetic pull-out switch module is in use, in the initial (locked) state, the locking pin protrudes from the outside of the shell to lock the relevant isolation mechanism. Under the extension of the return spring, the top surface of the drive ring is tightly against the moving iron core. Under the extension of the transmission spring, the top surface of the drive ring is tightly against the limit nut. The triggering gap between the annular boss and the limit step is the largest. The top of the button of the microswitch abuts the bottom end surface of the core rod. After the electromagnetic coil is energized, the moving iron core is attracted by the static iron core and the locking pin is lowered. The return spring and the transmission spring are compressed, and the transmission spring presses down the annular boss. The core rod (annular boss) descends, and the button of the microswitch is pressed by the core rod to trigger the microswitch to output a switching electrical signal. When the annular boss abuts against the limit boss, it is blocked and cannot go down. When the cam is in the locked position, the locking pin is released, and the pin is released again, and the return spring and the transmission spring are further compressed until the moving iron core moves to the limit position (such as abutting the static iron core), and the relevant isolation mechanism is released; when it is necessary to lock the relevant isolation mechanism again, the electromagnetic coil is de-energized, and under the action of the return spring and the transmission spring, the moving iron core with the locking pin is reset on the drive ring, and the core rod also moves upward to reset, the button of the microswitch is reset and the microswitch is triggered again to output the switching signal, the moving iron core moves to the limit position, and the locking pin completes the locking of the isolation mechanism.

[0014] The advantages of the present invention are as follows: first, it has a long service life. The present invention adopts a trigger microswitch to output a switching electrical signal to the outside, replacing the existing structure in which the locking pin with a combination button abuts against the reed to trigger the circuit. The present invention eliminates the repeated friction component, and the microswitch itself has the characteristics of long service life, which can make the product life up to millions of times, and can improve the service life of the entire module; second, it is conducive to reducing the size of the module. The small size of the microswitch can further reduce the size of the entire module; third, the action is sensitive and reliable. The microswitch is sensitive and the output switching circuit is reliable; fourth, the switching circuit is flexible. Several microswitches can be installed in the shell to realize different circuit forms: such as two groups of normally open, two groups of normally closed, one group of conversion, one group of normally open, one group of normally closed, two groups of conversion, etc. Fifth, a blind hole is provided on the bottom end surface of the locking pin to reserve an accommodation space for the top end of the static core rod, effectively solving the problem that the locking pin stroke is greater than the microswitch button stroke, causing the microswitch to be crushed; Sixth, this module can be used as a travel switch driven by mechanical and stroke force. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the locked state of the long-life electromagnetic pull-out switch module of the embodiment;

[0016] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0017] Figure 3 This is a schematic diagram of the structure of the anti-overvoltage drive assembly and the tension adjustment mechanism of the embodiment;

[0018] Figure 4 This is a schematic diagram of the micro switch operation during operation of the embodiment;

[0019] Figure 5 This is a schematic diagram of the unlocked state when the embodiment is working;

[0020] Figure 6 The figure is a schematic diagram of the structure of an electromagnetic pull-out switch module in the prior art.

[0021] In the figure, 1. Housing; 2. Locking pin; 2-1. Blind hole; 3. Electromagnetic coil; 4. Static iron core; 4-1. Limit step; 5. Moving iron core; 6. Core rod; 6-1. Annular boss; 6-2. Stroke adjustment ring; 6-3. Drive ring; 6-4. Limit nut; 7. Micro switch; 7-1. Button; 8. Transmission spring; 9. Return spring; 10. Trigger gap; 11 Reed; 12. Combination button. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the embodiments.

[0023] See also Figures 1 to 5 A high-life electromagnetic pull-out switch module includes a housing 1, a vertical locking pin 2, an electromagnet assembly arranged in the housing 1, and a signal switch assembly. The electromagnet assembly is arranged above the signal switch assembly. The electromagnet assembly includes an electromagnetic coil 3 and a moving iron core 5 in its center, a static iron core 4, and a return spring 9 arranged between the moving and static iron cores 4. The return spring 9 is connected to the tension adjustment mechanism. The moving and static iron cores are provided with a central through hole. The locking pin 2 is fixedly installed in the central hole of the moving iron core 5. Under the action of the return spring 9, the upper end of the locking pin 2 protrudes from the outside of the housing 1. The signal switch assembly includes a micro switch 7 and an overvoltage protection drive assembly.

[0024] Two micro switches 7 are arranged side by side below the static iron core 4, and the buttons 7-1 of the two micro switches 7 are both arranged upward.

[0025] The anti-overpressure drive assembly includes a vertical core rod 6 and a transmission spring 8. The core rod 6 is movably installed in the central hole of the static iron core 4 with its middle part. The top surface of the core rod 6 faces the blind hole 2-1 provided on the bottom end surface of the locking pin 2. The bottom end of the core rod 6 is screwed with a stroke adjustment ring 6-2 for adjusting the trigger gap 10. The bottom surface of the stroke adjustment ring 6-2 abuts against the top of the button 7-1 of the micro switch 7. An annular boss 6-1 is provided on the outer wall of the middle part of the core rod 6. A limiting step 4-1 corresponding to the annular boss 6-1 is provided on the inner wall of the central hole of the static iron core 4. The limiting step 4-1 is located below the annular boss 6-1. A trigger gap 10 is provided between the limiting step 4-1 and the annular boss 6-1. The transmission spring 8 is sleeved on the upper part of the core rod 6, and the lower end surface of the transmission spring 8 abuts against the top surface of the annular boss 6-1.

[0026] The tension adjustment mechanism includes a limit nut 6-4 and a drive ring 6-3 movably sleeved on the core rod 6. The limit nut 6-4 is screwed onto the external thread on the top of the core rod 6. The outer diameter of the limit nut 6-4 is smaller than the inner diameter of the blind hole 2-1, and the outer diameter of the drive ring 6-3 is larger than the inner diameter of the blind hole 2-1. The recoil spring 9 is concentric with the transmission spring 8 and is sleeved on the outside of the transmission spring 8. The lower end surface of the recoil spring 9 abuts the static iron core 4. The upper end surfaces of the transmission spring 8 and the recoil spring 9 both abut the bottom surface of the drive ring 6-3. The transmission spring 8 is left-handed and the recoil spring 9 is right-handed.

[0027] In this embodiment, the edge of the stroke adjustment ring 6-2 is provided with an anti-slip pattern to facilitate the rotation of the stroke adjustment ring 6-2.

[0028] When the switch module of this embodiment is working, in the initial (locked) state (see Figure 1 ), the locking pin 2 protrudes from the outside of the housing 1 to lock the relevant isolation mechanism. Under the extension of the return spring 9, the top surface of the drive ring 6-3 is tightly against the moving iron core 5. Under the extension of the transmission spring 8, the top surface of the drive ring 6-3 is tightly against the limit nut 6-4. By rotating the height of the limit nut 6-4, the extension tension of the return spring 9 and the transmission spring 8 can be adjusted. At this time, the trigger gap 10 between the annular boss 6-1 and the limit step 4-1 is the largest. The height of the rotating stroke adjustment ring can ensure the micro switch 7 The top of the button 7-1 abuts against the bottom end surface of the stroke adjustment ring 6-2. After the electromagnetic coil 3 is energized, the moving iron core 5 is attracted by the static iron core 4 and the locking pin 2 descends. The return spring 9 and the transmission spring 8 are compressed. The transmission spring 8 presses down the annular boss 6-1, and the core rod 6 (annular boss 6-1) descends. The button 7-1 of the micro switch 7 is pressed by the stroke adjustment ring 6-2 to trigger the micro switch 7. The module outputs a switching electrical signal to the outside. When the annular boss 6-1 abuts against the limit boss, it is blocked, causing the core rod 6 to stop descending (see Figure 4), the moving iron core 5 continues to descend with the locking pin 2 under the action of electromagnetic force, the driving ring 6-3 separates from the limit nut 6-4 and continues to descend. Since the core rod 6 is restricted by the limit step 4-1 and stops descending, its top end (including the limit nut 6-4) is relatively inserted into the blind hole 2-1 of the locking pin 2, and the return spring 9 and the transmission spring 8 are further compressed until the moving iron core 5 abuts the static iron core 4 (see Figure 5 ), the relevant isolation mechanism is released; when the relevant isolation mechanism needs to be locked again, the electromagnetic coil 3 is de-energized, and under the action of the return spring 9 and the transmission spring 8, the drive ring 6-3 moves in parallel and pushes the iron core 5 with the locking pin 2 to rise, and then the core rod 6 also rises, the button 7-1 of the microswitch 7 is reset and the microswitch 7 is triggered again to output the switching electrical signal, the moving iron core 5 moves to the limit position, and the locking pin 2 completes the locking of the isolation mechanism.

[0029] The anti-overvoltage drive component used in the high-life electromagnetic pull-out switch module of this embodiment can effectively prevent the long-stroke locking pin 2 from damaging the short-stroke microswitch 7 button 7-1 by overvoltage. The locking pin 2 can trigger two microswitches 7 at the same time by pressing down once. The two microswitches 7 can realize multiple circuit forms to meet the different needs of users. The switch module has the advantages of long life, sensitive and reliable operation.

Claims

1. A long-life electromagnetic pull-out switch module, comprising a housing, a vertical locking pin, an electromagnet assembly disposed within the housing, and a signal switch assembly. The electromagnet assembly is disposed above the signal switch assembly. The electromagnet assembly comprises an electromagnetic coil and a central moving iron core, a static iron core, and a return spring disposed between the moving and static iron cores. The return spring is connected to a tension adjustment mechanism. The moving and static iron cores are provided with a central through hole. The locking pin is fixedly mounted in the central hole of the moving iron core. Under the action of the return spring, the upper end of the locking pin protrudes outside the housing. The module is characterized in that: The signal switch assembly includes a micro switch and an anti-overvoltage drive assembly. The micro switch is arranged below the static iron core, and the button of the micro switch is arranged upward. The anti-overpressure drive assembly includes a vertical core rod and a transmission spring, wherein the core rod is movably installed in the central hole of the static iron core with its middle portion, the top surface of the core rod is opposite to the blind hole provided on the bottom end surface of the locking pin, and the bottom end surface of the core rod abuts the top end of the button of the micro switch, and an annular boss is provided on the outer wall of the middle portion of the core rod, and a limiting step corresponding to the annular boss is provided on the inner wall of the central hole of the static iron core, and the limiting step is located below the annular boss, and a trigger gap is provided between the limiting step and the annular boss, and the transmission spring is sleeved on the upper part of the core rod, and the lower end surface of the transmission spring abuts the top surface of the annular boss, and the bottom end of the core rod is screwed with a stroke adjustment ring for adjusting the trigger gap, and the bottom surface of the stroke adjustment ring abuts the top end of the button of the micro switch. The tension adjustment mechanism includes a limit nut and a drive ring movably mounted on the core rod. The limit nut is screwed onto the external thread on the top of the core rod. The outer diameter of the limit nut is smaller than the inner diameter of the blind hole, and the outer diameter of the drive ring is larger than the inner diameter of the blind hole. The recoil spring is concentric with the transmission spring and is mounted on the outside of the transmission spring. The lower end face of the recoil spring abuts the static iron core, and the upper end faces of the transmission spring and the recoil spring abut the bottom face of the drive ring. The spiral directions of the transmission spring and the recoil spring are opposite.

2. The long-life electromagnetic pull-out switch module according to claim 1, characterized in that: The stroke adjustment edge is provided with anti-slip patterns.

3. The long-life electromagnetic pull-out switch module according to claim 1, characterized in that: The switch assembly includes two micro switches.

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