Automatic electromagnetic plunger latch

Abstract

The utility model discloses an automatic electromagnetic plunger latch and belongs to the technical field of composite material functional structure manufacturing. One end of the door plate lock catch can extend into the shell in a sliding mode and is locked by the lower end of the plunger latch rocker arm, the adsorption end of the electromagnet is arranged close to the upper end of the plunger latch rocker arm, the lower end of the plunger latch rocker arm is branched to form a manual switch part, the manual switch part can rotate downwards to penetrate out of the shell, and the rotating point of the plunger latch rocker arm, the door plate lock catch and the manual switch part are sequentially arranged away from the electromagnet. Two torsion spring arms of the torsion spring are connected to the upper end of the plunger latch rocker arm and the lower end of the shell respectively. According to the utility model, the functions of automatically releasing the small door, releasing the small door by a manual tool and manually closing the small door without an external tool can be realized. According to the utility model, a self-locking structure scheme is adopted, self-locking is realized through a mechanism in normal use, a locking state is kept without additional magnetic force, an unlocking function can be realized only by less magnetic force during electromagnetic unlocking, the energy consumption is low, and the electromagnetic unlocking mechanism is more suitable for use environments with higher requirements on circuit load.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite material functional structure manufacturing, and in particular relates to an automatic electromagnetic latch. Background Art

[0002] Electromagnetic locks are widely used, usually in two types: adsorption type and bolt type. Adsorption type electromagnetic locks use the principle of electromagnetism. When current passes through silicon steel sheets, the electromagnetic lock will generate a strong suction force to tightly absorb the adsorption iron plate to achieve the effect of locking the door. It is often open and has high energy consumption. The bolt type electromagnetic lock is based on the commonly used mechanical lock. It controls the extension and retraction of the bolt through electromagnetic suction to achieve the unlocking function. It has a simple structure, but is not easy to maintain and is not suitable for complex environment requirements.

[0003] With the development of aerospace and rail transportation, the demand for high-performance electromagnetic latches is increasing. They require high load-bearing capacity and high reliability, and are suitable for complex use environments such as vibration and shock. They also require manual tools to be unlocked for easy inspection and maintenance. They need to be automatically released under certain conditions, and they are required to maintain their functions and closed locked state under working shock and falling impact to avoid non-command unlocking. In addition, in order to facilitate daily maintenance, they need to have the functions of manual tool release and manual closing without external tools.

[0004] At present, the electromagnetic automatic release and manual tool release functions of commonly used electromagnetic latches are implemented by different mechanisms. The latch structure is complex and has poor reliability. Frequent inspection and maintenance are required to ensure the effectiveness of the latch function. At the same time, electromagnetic unlocking needs to overcome a large structural impedance and has high power requirements for the electromagnet, which makes it difficult to meet the rapidly developing high-efficiency needs of the aerospace field. Utility Model Content

[0005] In order to solve the above problems, the utility model further provides an automatic electromagnetic latch;

[0006] The technical solution adopted by the utility model is:

[0007] An automatic electromagnetic latch comprises a shell, an electromagnet, a latch rocker arm, a torsion spring and a door panel lock catch; the latch rocker arm is rotatably installed in the shell, one end of the door panel lock catch can slide into the shell and be locked by the lower end of the latch rocker arm, the electromagnet is installed in the shell, the adsorption end of the electromagnet is arranged close to the upper end of the latch rocker arm, the lower end of the latch rocker arm branches out a manual switch part, the manual switch part can be rotated downward to pass through the shell, and the rotation point of the latch rocker arm, the door panel lock catch and the manual switch part are arranged away from the electromagnet in sequence, and the two torsion spring arms of the torsion spring are respectively connected to the upper end of the latch rocker arm and the lower end of the shell.

[0008] Compared with the prior art, the utility model has the following beneficial effects:

[0009] 1. The utility model can realize the functions of automatic release of the small door, release with manual tools, and manual closing without external tools. It is suitable for fields such as aerospace, rail transportation, etc. that have high requirements on size, weight, power, reliability, and use environment.

[0010] 2. The utility model has the advantages of high integration, simple structure, high device reliability and low maintenance cost.

[0011] 3. The utility model adopts a structural and functional integrated design scheme, with a compact structure, good electromagnetic shielding effect, high space utilization and light weight.

[0012] 4. The utility model adopts a self-locking structure solution, which realizes self-locking through the mechanism in normal use. No additional magnetic force is required to maintain the locked state. Only less magnetic force is needed for electromagnetic unlocking to realize the unlocking function. It has low energy consumption and is more suitable for use environments with higher circuit load requirements.

[0013] 5. The utility model adopts thermoplastic composite material + short-cut fiber injection molding process, which has high manufacturing efficiency, is suitable for mass production, has low manufacturing cost and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the locked state of the utility model;

[0015] Figure 2 This is a schematic diagram of the unlocked state of the utility model;

[0016] Figure 3 This is a schematic diagram of the force on the rocker arm of the latch of the utility model;

[0017] Figure 4 This is a schematic diagram of the locking operation of the electromagnetic latch of the utility model;

[0018] Figure 5 This is a schematic diagram of the locking of the rocker arm of the latch of the utility model;

[0019] Figure 6 This is a schematic diagram of the electromagnetic unlocking process of the utility model;

[0020] Figure 7 This is a schematic diagram of manual unlocking of the utility model;

[0021] Among them: 1. Shell; 2. Electromagnet; 3. Latch rocker arm; 4. Shell block; 5. Torsion spring; 6. Base; 7. Door panel lock; 8. Wire; 31. Manual switch part; 32. Torsion spring interface; 33. Electromagnetic cover; 34. Latch shaft; 35. Lock hook part. DETAILED DESCRIPTION

[0022] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0023] Reference Figure 1 to Figure 7 As shown, an automatic electromagnetic latch comprises a shell 1, an electromagnet 2, a latch rocker arm 3, a torsion spring 5 and a door panel lock catch 7; the latch rocker arm 3 is rotatably installed in the shell 1, one end of the door panel lock catch 7 can slide into the shell 1 and be locked by the lower end of the latch rocker arm 3, the electromagnet 2 is installed in the shell 1, the adsorption end of the electromagnet 2 is arranged close to the upper end of the latch rocker arm 3, the lower end of the latch rocker arm 3 branches out a manual switch part 31, the manual switch part 31 can be rotated downward to pass through the shell 1, and the rotation point of the latch rocker arm 3, the door panel lock catch 7 and the manual switch part 31 are successively arranged away from the electromagnet 2, and the two torsion spring arms of the torsion spring 5 are respectively connected to the upper end of the latch rocker arm 3 and the lower end of the shell 1.

[0024] The lower end of the latch rocker arm 3 is provided with a lock hook portion 35, and the upper end of the door panel lock buckle 7 is provided with a lock shaft. The latch rocker arm 3 can hook the lock shaft of the door panel lock buckle 7 through the lock hook portion 35. The latch rocker arm 3 is rotatably installed in the shell 1 through the latch shaft 34. An electromagnetic cover plate 33 is installed on the latch rocker arm 3, and is magnetically connected to the electromagnet 2 through the electromagnetic cover plate 33.

[0025] The spring coil portion of the torsion spring 5 is coaxially arranged with the latch shaft 34 .

[0026] The electromagnet 2 is installed in the housing 1 through a housing stopper 4 .

[0027] A base 6 is disposed on the bottom surface of the housing 1 .

[0028] The housing 1 and the latch rocker arm 3 are formed by thermoplastic composite material + chopped fiber injection molding process; the latch shaft 34 and the electromagnetic cover plate 33 are made of stainless steel. The torsion spring 5 is made of 65Mn or 60Si2Mn silicon-manganese spring steel.

[0029] The electromagnetic latch enables automatic door release, manual tool release, and manual closing without the use of external tools.

[0030] Working process:

[0031] Locking operation: (F push × L push > F torsion spring × L torsion spring) (such as Figure 4 (shown)

[0032] When the door panel assembly is opened for maintenance or manually, the door panel assembly can be pushed up to close and lock the door panel without the need for external tools to achieve the manual closing function.

[0033] When the door panel assembly is pushed up, the door panel lock catch 7 of the door panel assembly first contacts the lock hook portion 35 of the latch rocker arm 3 and pushes the latch rocker arm 3 to rotate clockwise, and the thrust counteracts the effect of the torsion spring 5 (F push × L push > F torsion spring × L torsion spring).

[0034] When the center position of the door panel lock 7 is higher than the end of the lock hook portion 35, the latch rocker arm 3 rotates counterclockwise under the action of the torsion spring 5, and the lock hook portion 35 forms a pre-tightening force on the door panel lock 7 of the door panel assembly, thereby realizing the locking function of the door panel assembly.

[0035] Locking function: (F torsion spring × L torsion spring>0) (such as Figure 5 (shown)

[0036] When the electromagnetic coil is not energized (normal state), under the action of the gravity of the door panel structure, the door panel lock catch 7 presses the lock hook portion 35 of the latch rocker arm 3;

[0037] The line of action of the gravity of the door panel structure passes through the latch shaft 34, the door panel lock buckle 7 does not generate a rotational torque, and the latch rocker arm 3 has no tendency to rotate, thus achieving structural self-locking and ensuring the locking function of the door panel assembly;

[0038] At the same time, there is a small amount of counterclockwise torque in the torsion spring 5 (F torsion spring × L torsion spring), which forms a pre-tightening force on the door panel lock 7, further ensuring that the latch rocker arm 3 cannot rotate clockwise, keeping the door panel assembly normally closed and fully functional, and effectively preventing the door panel from falling off uninstructed.

[0039] Electromagnetic unlocking function: (when F electromagnetic × L electromagnetic ≥ F torsion spring × L torsion spring)

[0040] When the electromagnetic latch is locked (normal), if the door panel assembly needs to be opened under special circumstances, the electromagnetic latch receives an unlocking signal (the electromagnetic coil is energized according to the specified parameters), and the electromagnet generates magnetic force to attract the electromagnetic cover plate 33 of the latch rocker arm 3 to overcome the reaction of the torsion spring 5 (when F electromagnetic × L electromagnetic ≥ F torsion spring × L torsion spring).

[0041] The latch rocker arm 3 rotates clockwise around the latch shaft 34 under the drive of the electromagnetic cover plate 33, and the lock hook portion 35 of the latch rocker arm 3 is disengaged from the door panel lock catch 7, and the door panel assembly is opened under the action of gravity, thereby releasing the locked state of the door panel assembly and realizing the unlocking function (such as Figure 6 shown).

[0042] Manual unlocking function: (F manual × L manual > F torsion spring × L torsion spring)

[0043] During routine inspection and maintenance of the door panel assembly, it is often necessary to manually unlock the door panel assembly. The door panel assembly can be unlocked manually or using a manual release tool;

[0044] The manual switch is pushed upward manually or with a manual release tool to overcome the reaction torque of the torsion spring 5 (Fmanual×Lmanual>Ftorsion spring×Ltorsion spring), and the latch rocker arm 3 is pushed to rotate clockwise. The lock hook portion 35 of the latch rocker arm 3 is disengaged from the door panel lock catch 7, and the door panel assembly is opened under the action of gravity, thereby releasing the locked state of the door panel assembly and realizing the manual unlocking function (such as Figure 7 shown).

[0045] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An automatic electromagnetic latch, characterized in that: The invention comprises a housing (1), an electromagnet (2), a latch rocker arm (3), a torsion spring (5) and a door panel lock (7); the latch rocker arm (3) is rotatably mounted in the housing (1); one end of the door panel lock (7) can slide into the housing (1) and be locked by the lower end of the latch rocker arm (3); the electromagnet (2) is mounted in the housing (1); the adsorption end of the electromagnet (2) is arranged close to the upper end of the latch rocker arm (3); a manual switch part (31) branches out from the lower end of the latch rocker arm (3); the manual switch part (31) can rotate downward and pass through the housing (1); and the rotation point of the latch rocker arm (3), the door panel lock (7) and the manual switch part (31) are arranged away from the electromagnet (2) in sequence; and two torsion spring arms of the torsion spring (5) are respectively connected to the upper end of the latch rocker arm (3) and the lower end of the housing (1).

2. The automatic electromagnetic latch according to claim 1, characterized in that: The lower end of the latch rocker arm (3) is provided with a lock hook portion (35), and the upper end of the door panel lock (7) is provided with a lock shaft. The latch rocker arm (3) can hook the lock shaft of the door panel lock (7) through the lock hook portion (35). The latch rocker arm (3) is rotatably installed in the housing (1) through the latch shaft (34). An electromagnetic cover plate (33) is installed on the latch rocker arm (3) and is magnetically connected to the electromagnet (2) through the electromagnetic cover plate (33).

3. An automatic electromagnetic latch according to claim 2, characterized in that: The latch rocker arm (3) is formed by a chopped fiber injection molding process.

4. The automatic electromagnetic latch according to claim 2, characterized in that: The spring coil portion of the torsion spring (5) is coaxially arranged with the latch shaft (34).

5. The automatic electromagnetic latch according to claim 1, characterized in that: The electromagnet (2) is installed in the housing (1) via a housing stopper (4).

6. An automatic electromagnetic latch according to claim 5, characterized in that: The bottom surface of the shell (1) is provided with a base (6).

7. An automatic electromagnetic latch according to claim 6, characterized in that: The shell (1) is made of thermoplastic material.

8. The automatic electromagnetic latch according to claim 2, characterized in that: The torsion spring (5) is made of 65Mn or 60Si2Mn silicon-manganese spring steel, and the latch shaft (34) and the electromagnetic cover plate (33) are made of stainless steel.

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