A micro electromagnetic pin puller with self-locking in place

Abstract

A kind of to position self-locking miniature electromagnetic pin puller, including outer yoke, iron core, pin, armature and reset spring, iron core is equipped with coil holder, coil is wound on coil holder, the lower part of outer yoke is equipped on coil holder, and the lower end of outer yoke is riveted with the lower end of iron core;End cover is spot-welded and fixed on the upper end of outer yoke, pin is sequentially inserted in end cover, armature and iron core, reset spring is equipped on pin, and located between armature and iron core, the lower end of iron core is provided with limiting mechanism;Pin lower end has annular groove, and initial state annular groove is located in iron core, when coil is energized, armature drives pin to compress reset spring and move to position, then annular groove extends out of the lower end of iron core and is engaged with limiting mechanism to lock pin, when coil is de-energized, pin still keeps locked state.The utility model overcomes the deficiencies of prior art.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic pin puller technology, and in particular relates to a self-locking miniature electromagnetic pin puller. Background Technology

[0002] After the electromagnetic pin is pulled out of the ammunition fuse to release the safety, the electromagnetic pin needs to remain in that state after activation. However, existing electromagnetic pin pullers require continuous power to maintain the switched state for an extended period, resulting in low reliability and high energy consumption. For example, in the "miniature electromagnetic pin puller CN211041965U", after the coil is de-energized, a return spring drives the armature to separate from the yoke, restoring the electromagnetic pin puller to its initial state. Therefore, how to control the reliable pin release of the ammunition fuse using an electromagnetic pin puller, and how to ensure that it can return to its initial state after the safety is released, to prevent accidental detonation of the weapon, is an urgent technical problem that needs to be solved. Utility Model Content

[0003] This invention provides a self-locking miniature electromagnetic pin puller to overcome the shortcomings of the prior art.

[0004] The technical solution adopted by this utility model is: a self-locking miniature electromagnetic pin puller, including an outer yoke, an iron core, a pin, an armature, and a return spring. A coil frame is fitted on the iron core, and a coil is wound on the coil frame. The lower part of the outer yoke is fitted on the coil frame, and the lower end of the outer yoke is riveted to the lower end of the iron core. An end cap is spot-welded to the upper end of the outer yoke. The pin is sequentially inserted into the end cap, the armature, and the iron core. The return spring is fitted on the pin and located between the armature and the iron core. A limit mechanism is provided at the lower end of the iron core. The lower end of the pin has an annular groove, and in the initial state, the annular groove is located in the iron core. When the coil is energized, the armature drives the pin to compress the return spring and move downward to the desired position. The annular groove extends out of the lower end of the iron core and engages with the limit mechanism to lock the pin. When the coil is de-energized, the pin remains locked.

[0005] The limiting mechanism is an elastic limiting mechanism that can be automatically twisted horizontally.

[0006] The elastic limiting mechanism includes a limiting block. One end of the limiting block is hinged to the lower end face of the iron core by a positioning pin. A torsion spring is fitted on the positioning pin. In the initial state, the other end of the limiting block is horizontally twisted by the force of the torsion spring and abuts against the lower end of the pin. When the annular groove extends out of the lower end of the iron core, the other end of the limiting block automatically engages in the annular groove.

[0007] A horizontal platform shoulder is formed on the contact surface between the limiting block and the lower end of the pin, and an arc-shaped groove is provided above the horizontal platform shoulder. When the annular groove extends out of the lower end of the iron core, the horizontal platform shoulder automatically gets into the annular groove, and the lower end of the pin is accommodated in the arc-shaped groove.

[0008] The lower end face of the iron core is provided with a positioning post. One end of the torsion spring is fixed to the limiting block and the other end is fixed to the positioning post. The limiting block is located between the pin and the positioning post.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. This utility model, by setting an automatic torsion limit mechanism, locks the electromagnetic pin puller after it is switched to the pin-pulling state. It does not require continuous power supply, has low energy consumption, and can be unlocked to return to the initial state. It solves the technical problem of reliable pin-pulling and unlocking of ammunition fuses, and can still return to the initial state after the safety is released, ensuring that the weapon will not explode accidentally; it ensures the safety and reliability of locking.

[0011] 2. This utility model is small in size, simple to operate, easy to maintain, and lightweight, meeting the needs of lightweight and miniaturized ammunition fuses. Attached Figure Description

[0012] Figure 1 This is a schematic cross-sectional view of the initial state of this utility model;

[0013] Figure 2 This is a schematic cross-sectional view of the pinned structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the limiting mechanism structure of this utility model;

[0015] Figure 4 This is a schematic diagram of the pin in the unlocked state of this utility model;

[0016] Figure 5 This is a schematic diagram of the pin locking state of this utility model;

[0017] Figure 6 This is a schematic diagram of the pin structure of this utility model. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1-6 The present invention will be described in detail with reference to specific embodiments.

[0019] A self-locking miniature electromagnetic pin puller includes an outer yoke 1, an iron core 2, a pin 4, an armature 3, and a return spring 5. A coil frame 6 is mounted on the iron core 2, and a coil 7 is wound on the coil frame 6. The lower part of the outer yoke 1 is mounted on the coil frame 6, and the lower end of the outer yoke 1 is riveted to the lower end of the iron core 2. An end cap 8 is spot-welded to the upper end of the outer yoke 1. The pin 4 is sequentially inserted into the end cap 8, the armature 3, and the iron core 2. The return spring 5 is mounted on the pin 4 and is located between the armature 3 and the iron core 2.

[0020] The lower end of the iron core 2 is provided with a limiting mechanism 9; the lower end of the pin 4 has an annular groove 4-2, and in the initial state the annular groove 4-2 is located in the iron core 2. When the coil 7 is energized, the armature 3 drives the pin 4 to compress the reset spring 5 and move downward to the position. Then the annular groove 4-2 extends out of the lower end of the iron core 2 and engages with the limiting mechanism 9 to lock the pin 4. When the coil 7 is de-energized, the pin 4 remains locked.

[0021] When pin 4 needs to be unlocked, the limiting mechanism 9 is disengaged from the annular groove 4-2 by external force, thus unlocking. At this time, under the action of the return spring 5, the armature 3 drives pin 4 to move upward, so that pin 4 returns to its initial position.

[0022] In one embodiment, the limiting mechanism 9 is preferably an elastic limiting mechanism that can automatically twist horizontally. The elastic limiting mechanism includes a limiting block 9-1, one end of which is hinged to the lower end face of the iron core 2 via a positioning pin 9-2. A torsion spring 9-3 is fitted on the positioning pin 9-2, and in the initial state, the force of the torsion spring 9-3 causes the other end of the limiting block 9-1 to twist horizontally and abut against the lower end of the pin 4. When the annular groove 4-2 extends out of the lower end of the iron core 2, the other end of the limiting block 9-1 automatically engages with the annular groove 4-2.

[0023] A horizontal plateau shoulder 9-5 is formed on the contact surface between the limiting block 9-1 and the lower end of the pin 4, and an arc-shaped groove 9-6 is provided above the horizontal plateau shoulder 9-5. When the annular groove 4-2 extends out of the lower end of the iron core 2, the horizontal plateau shoulder 9-5 automatically engages in the annular groove 4-2, and the lower end of the pin 4 is accommodated in the arc-shaped groove 9-6. When the coil 7 is de-energized and the electromagnetic attraction disappears, the limiting block 9-1 is in the locked position driven by the elastic force of the torsion spring 9-3, and the pin 4 maintains a mechanically locked state without the need for continuous power.

[0024] The lower end face of the iron core 2 is provided with a positioning post 9-4. One end of the torsion spring 9-3 is fixed to the limiting block 9-1 and the other end is fixed to the positioning post 9-4. The limiting block 9-1 is located between the pin 4 and the positioning post 9-4, restricting the limiting block 9-1 to only make horizontal fan-shaped movements between the pin 4 and the positioning post 9-4.

[0025] When pin 4 needs to be unlocked, a force in the opposite direction to the torque of torsion spring 9-3 is applied to one end of the limiting block 9-1 that is engaged in the annular groove 4-2, so that the horizontal platform shoulder 9-5 on the limiting block 9-1 can be moved out of the annular groove 4-2.

[0026] In the above embodiment, the limiting block 9-1 is made of a high-temperature resistant and high-wear-resistant insulating material. The top of the pin 4 is provided with a pin head 4-1 for connection to the controlled device, such as a munition fuse device.

[0027] This utility model can be locked repeatedly, and is small in size (Φ20mm×20mm), with a mounting plate diameter not exceeding Φ30mm and a weight not exceeding 30g. It has a compact structure, is lightweight, and meets the requirements for lightweight, miniaturized, and energy-saving use of ammunition fuses.

[0028] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of implementation of the present utility model. Therefore, all equivalent variations made based on the content described in the claims of the present utility model should be included within the scope of the claims of the present utility model.

Claims

1. A self-locking miniature electromagnetic pin puller, comprising an outer yoke (1), an iron core (2), a pin (4), an armature (3), and a return spring (5), wherein a coil frame (6) is mounted on the iron core (2), a coil (7) is wound on the coil frame (6), the lower part of the outer yoke (1) is mounted on the coil frame (6), and the lower end of the outer yoke (1) is riveted to the lower end of the iron core (2); an end cap (8) is spot-welded to the upper end of the outer yoke (1), the pin (4) is sequentially inserted into the end cap (8), the armature (3), and the iron core (2), and the return spring (5) is mounted on the pin (4) and located between the armature (3) and the iron core (2), characterized in that: The lower end of the iron core (2) is provided with a limiting mechanism (9); the lower end of the pin (4) has an annular groove (4-2), and in the initial state the annular groove (4-2) is located in the iron core (2). When the coil (7) is energized, the armature (3) drives the pin (4) to compress the reset spring (5) and move downward to the position. Then the annular groove (4-2) extends out of the lower end of the iron core (2) and engages with the limiting mechanism (9) to lock the pin (4). When the coil (7) is de-energized, the pin (4) remains locked.

2. The self-locking miniature electromagnetic pin puller according to claim 1, characterized in that: The limiting mechanism (9) is an elastic limiting mechanism that can be automatically twisted horizontally.

3. The self-locking miniature electromagnetic pin puller according to claim 2, characterized in that: The elastic limiting mechanism includes a limiting block (9-1). One end of the limiting block (9-1) is hinged to the lower end face of the iron core (2) by a positioning pin (9-2). A torsion spring (9-3) is fitted on the positioning pin (9-2). In the initial state, the other end of the limiting block (9-1) is horizontally twisted by the force of the torsion spring (9-3) and abuts against the lower end of the pin (4). When the annular groove (4-2) extends out of the lower end of the iron core (2), the other end of the limiting block (9-1) automatically engages with the annular groove (4-2).

4. The self-locking miniature electromagnetic pin puller according to claim 3, characterized in that: A horizontal plateau shoulder (9-5) is formed on the contact surface between the limiting block (9-1) and the lower end of the pin (4), and an arc-shaped groove (9-6) is provided above the horizontal plateau shoulder (9-5). When the annular groove (4-2) extends out of the lower end of the iron core (2), the horizontal plateau shoulder (9-5) automatically gets into the annular groove (4-2), and the lower end of the pin (4) is accommodated in the arc-shaped groove (9-6).

5. A self-locking miniature electromagnetic pin puller according to claim 3, characterized in that: The lower end face of the iron core (2) is provided with a positioning post (9-4), one end of the torsion spring (9-3) is fixed to the limiting block (9-1) and the other end is fixed to the positioning post (9-4), and the limiting block (9-1) is located between the pin (4) and the positioning post (9-4).

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