A bounce back prevention mechanism for a blast door opening

Abstract

The application discloses a kind of anti-rebound mechanisms for blasting door opening, including base, shell, locking rotary arm, reset mechanism, unlocking mechanism and stopper;Shell is fixedly installed on base;Locking rotary arm is rotatably installed on shell by a rotating shaft;Reset mechanism is arranged between shell and locking rotary arm, for providing elastic reset force to locking rotary arm so that it has a tendency to rotate towards the locking position;Unlocking mechanism includes electromagnet and connecting head, electromagnet is fixedly installed on base, connecting head one end is fixedly connected on locking rotary arm, the other end is drivingly connected with the core of electromagnet;Stopper is fixedly connected on blasting door.Wherein, the locking rotary arm has a locking position in the reset mechanism drive and embedded with stopper to prevent the rebound of blasting door, and an unlocking position in the electromagnet drive and separated from stopper by overcoming the reset force of reset mechanism.The application can realize reliable locking and quick unlocking, simple and durable structure, easy to install and maintain.

Description

Technical Field

[0001] This invention relates to the field of rapid decompression chamber blasting door technology, specifically to an anti-rebound mechanism for opening blasting doors. Background Technology

[0002] A blasting door is a key device in a rapid decompression chamber used to isolate two sealed spaces with different pressures. When rapid decompression is required, the blasting door can open quickly, connecting the two sealed spaces with different pressures to achieve pressure balance, thereby rapidly decompressing the space with the higher pressure. Blasting doors have wide applications in many fields such as biomedicine, aerospace, and defense. However, due to functional requirements, blasting doors are usually characterized by large size, heavy weight, and fast opening speed. After the blasting door is in place, the huge inertia and pressure fluctuations can easily cause it to rebound. This rebound not only seriously affects the working performance and sealing effect of the blasting door, but may also impact its structure and connected equipment, thereby shortening the service life of the blasting door. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an anti-rebound mechanism for opening blast doors, thereby solving the problem that blast doors are prone to rebound due to inertia and pressure fluctuations after the action is completed, thus ensuring the working performance, sealing effect, and service life of the blast doors.

[0004] The objective of this invention is achieved through the following technical solution: An anti-rebound mechanism for opening a blasting door includes a base, a housing, a locking arm, a reset mechanism, an unlocking mechanism, and a stop. The housing is fixedly mounted on the base; the locking arm is rotatably mounted on the housing via a pivot; the reset mechanism is disposed between the housing and the locking arm, providing an elastic reset force to the locking arm to induce a rotation towards the locked position; the unlocking mechanism includes an electromagnet and a connector, the electromagnet being fixedly mounted on the base, one end of the connector being fixedly connected to the locking arm, and the other end being driven to the core of the electromagnet; the stop is fixedly connected to the blasting door. The locking arm has a locked position where it engages with the stop under the drive of the reset mechanism to prevent the blasting door from rebounding, and an unlocked position where it separates from the stop under the drive of the electromagnet, overcoming the reset force of the reset mechanism.

[0005] Furthermore, the reset mechanism includes a spring mounting shaft and a reset spring; one end of the spring mounting shaft is fixed to the housing, and the other end extends into and slides into a preset mounting hole on the locking arm; the reset spring is sleeved outside the spring mounting shaft, and its two ends abut against the housing and the locking arm respectively.

[0006] Preferably, the mounting hole is a variable diameter hole, with the inner diameter of the upper inner side being larger than the inner diameter of the lower inner side, forming a stepped surface; the spring mounting shaft has a shoulder at the upper inner side of the mounting hole, the diameter of which is larger than the inner diameter of the lower inner side of the mounting hole, so that when the locking arm rotates, the shoulder cooperates with the stepped surface to limit the rotation angle of the locking arm.

[0007] Furthermore, the housing is provided with a positioning hole or positioning boss for accommodating and positioning one end of the return spring.

[0008] Preferably, the spring mounting shaft is threadedly connected to the housing.

[0009] Furthermore, the end of the electromagnet core is provided with a guide groove, and a connecting pin is provided laterally in the guide groove; the end of the connector that is connected to the electromagnet core is provided with an elongated hole, which is fitted onto the connecting pin and can move up and down along the connecting pin in the guide groove.

[0010] Preferably, a bearing is provided between the locking arm and the rotating shaft.

[0011] Preferably, the locking arm, housing, and base are all made of high-strength structural steel.

[0012] Furthermore, the contact surfaces of the stop and the locking arm are complementary in shape and have a fitting structure.

[0013] Preferably, the fitting structure includes a protrusion on the top of the locking arm and a corresponding groove on the bottom of the stop.

[0014] The beneficial effects of this invention are as follows: (1) Reliable locking can be achieved: the locking arm is driven to engage with the stop block by the reset mechanism, which can effectively prevent the blasting door from rebounding after it is in place, ensuring that the blasting door is stably in the open state and avoiding sealing failure and performance degradation caused by rebound.

[0015] (2) It can achieve rapid unlocking: the locking arm is driven by an electromagnet to overcome the reset force of the reset spring and move to the unlock position. The unlocking process is fast and reliable, which makes it easy to close or adjust the blasting door again.

[0016] (3) Simple and durable structure: The key components are made of high-strength structural steel and combined with bearings and other structures, which improves the overall strength and life of the mechanism and adapts to the harsh working conditions of high-speed opening of the blasting door.

[0017] (4) Easy to install and maintain: The reset mechanism and unlocking mechanism have a reasonable structural design, are easy to assemble and debug, and reduce manufacturing and maintenance costs.

[0018] Furthermore, this invention is particularly applicable to rapid decompression chamber blast doors in fields such as biomedicine, aerospace, and defense, and has high practical value and promising prospects for promotion. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the anti-rebound mechanism described in this invention.

[0021] Figure 2 This is a cross-sectional view of the anti-rebound mechanism described in this invention.

[0022] Figure 3 This is a schematic diagram of the locked state of the anti-rebound mechanism described in this invention.

[0023] Figure 4 This is a schematic diagram of the unlocked state of the anti-rebound mechanism described in this invention.

[0024] In the figure: 1-base; 2-housing; 3-locking arm; 31-mounting hole; 32-protrusion; 4-rotating shaft; 5-reset spring; 6-spring mounting shaft; 7-connector; 8-connecting pin; 9-electromagnet; 91-iron core; 10-stop; 101-groove. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0028] like Figures 1 to 4 As shown, this embodiment provides an anti-rebound mechanism for opening a blast door, including a base 1, a housing 2, a locking rotating arm 3, a reset mechanism, an unlocking mechanism, and a stop block 10.

[0029] The base 1, housing 2 and locking arm 3 are all made of high-strength structural steel to ensure sufficient strength and rigidity when subjected to the huge impact force of the blasting door.

[0030] The housing 2 is fixedly mounted on the base 1 by screws, and the housing 2 has an overall groove-shaped structure.

[0031] One end of the locking arm 3 is rotatably mounted on the housing 2 via the rotating shaft 4, and the other end extends out of the housing 2 and is positioned directly above the unlocking mechanism. The top of the end of the locking arm 3 extending out of the housing 2 is provided with a protrusion 32. A bearing is provided between the locking arm 3 and the rotating shaft 4 to reduce rotational friction and improve the sensitivity of the action and service life.

[0032] The reset mechanism is disposed between the housing 2 and the locking arm 3, and is used to provide an elastic reset force to the locking arm 3, causing it to rotate toward the locked position. The reset mechanism includes a reset spring 5 and a spring mounting shaft 6. One end of the spring mounting shaft 6 is fixed to the housing 2 by a threaded connection, and the other end extends into and slides into a pre-set mounting hole 31 on the locking arm 3 (middle part). The reset spring 5 is sleeved on the outside of the spring mounting shaft 6, with one end abutting against a positioning boss (or positioning hole) provided on the housing 2, and the other end abutting against the locking arm 3. The reset spring 5 is a compression spring, and always applies an elastic reset force to the locking arm 3, causing it to rotate toward the locked position (upward).

[0033] The mounting hole 31 is a variable diameter hole, with its upper inner diameter being larger than its lower inner diameter, thus forming a stepped surface. Correspondingly, the portion of the spring mounting shaft 6 that extends into the mounting hole 31 has a shoulder, the diameter of which is larger than the lower inner diameter of the mounting hole 31. When the locking arm 3 rotates, the shoulder engages with the stepped surface, limiting the maximum rotation angle of the locking arm 3 and preventing excessive rotation.

[0034] The unlocking mechanism includes an electromagnet 9, a connector 7, and a connecting pin 8. The electromagnet 9 is fixedly mounted on the base 1 with screws, with one end of its core 91 facing upwards (towards the end of the locking arm 3 extending out of the housing 2). The electromagnet 9 adopts a conventional electromagnet structure, mainly including a coil, a stationary core, a moving core (i.e., the core 91 of this application), and a spring disposed between the stationary and moving cores. When the coil is energized, it generates an electromagnetic force that attracts the moving core, overcoming the spring force and causing the moving core to move towards the stationary core, i.e., the moving core retracts. When the coil is de-energized, the electromagnetic force disappears, and the spring force pushes the moving core outwards. One end of the connector 7 is fixed to the end of the locking arm 3 extending out of the housing 2 and positioned directly above the unlocking mechanism by a threaded connection, and the other end of the connector 7 has an elongated hole. The top of the core 91 of the electromagnet 9 is recessed to form a guide groove, and the connecting pin 8 is horizontally disposed within this guide groove. The elongated hole of the connector 7 is fitted onto the connecting pin 8 and can move up and down along the connecting pin 8 in the guide groove, thereby realizing the driving connection 9 between the electromagnet 9 core 91 and the connector 7.

[0035] The stop block 10 is fixedly installed on the blasting door and moves with the blasting door. The bottom of the stop block 10 is provided with a groove 101, which forms a complementary fitting structure with the protrusion 32 on the top of the locking rotating arm 3. Locked status:

[0036] like Figure 3 The diagram shows the anti-rebound mechanism for opening the blast door in the locked state. At this time (before the blast door is opened), the electromagnet 9 is de-energized, its iron core 91 extends, and the locking arm 3 is pushed up by the return spring 5. Its top protrusion 32 is fitted into the groove 101 of the stop block 10, so that the stop block 10 and the blast door cannot move to the right, and the blast door is in the locked state (locked position). Unlocked status:

[0037] like Figure 4 The diagram shows the anti-rebound mechanism for opening the blast door in the unlocked state. At this time, the electromagnet 9 is energized, the iron core 91 is retracted, the connector 7 and the locking arm 3 move down, the protrusion 32 of the locking arm 3 disengages from the groove 101 of the stop block 10, the stop block 10 and the blast door lose their limit, and the blast door is in the unlocked state.

[0038] Working principle: Locking process:

[0039] like Figure 3As shown, when the blasting door explodes, the electromagnet 9 is de-energized, and the anti-rebound mechanism for opening the blasting door is locked. The stop block 10 is located on the right side of the anti-rebound mechanism. During the explosion, the blasting door moves rapidly from right to left, opening quickly and causing the stop block 10 to move to the left. The bottom of the stop block 10 presses against the protrusion 32 of the locking arm 3, forcing the locking arm 3 to rotate counterclockwise around the pivot 4, compressing the return spring 5. The stop block 10 continues to move from right to left. When the groove 101 of the stop block 10 moves directly above the protrusion 32 of the locking arm 3, the locking arm 3 quickly returns to its original position under the return force of the return spring 5, and its protrusion 32 embeds into the groove 101 of the stop block 10, forming a mechanical fit. At this time, the stop block 10 and the blasting door cannot rebound to the right, thus achieving reliable locking of the blasting door. Unlocking process:

[0040] like Figure 4 As shown, when unlocking is required, electromagnet 9 is energized, its core 91 retracts, and through the transmission of connector 7 and connecting pin 8, the core 91 of electromagnet 9 pulls locking arm 3, causing locking arm 3 to overcome the reset force of reset spring 5 and rotate counterclockwise around shaft 4 to the unlock position. At this time, the protrusion 32 of locking arm 3 separates from the groove 101 of stop block 10, and stop block 10 and blast door are no longer restricted by locking arm 3, and can move freely, facilitating the closing or reset of blast door.

[0041] Through the above structure, this invention can quickly and reliably lock the blast door after it has been opened to the correct position, effectively preventing rebound caused by inertia or pressure fluctuations, thus ensuring the working performance and service life of the blast door. Simultaneously, rapid unlocking is achieved via an electromagnet, making operation simple and responsive. The entire mechanism is compact and high-strength, suitable for harsh working conditions involving high speed and high impact, and particularly suitable for widespread application in rapid decompression chamber blast doors in fields such as biomedicine, aerospace, and defense.

[0042] Other aspects of this invention that are not detailed herein are all conventional techniques known to those skilled in the art.

[0043] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] The scope of protection of this invention is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this invention shall fall within the scope of protection of this invention.

Claims

1. A bounceback prevention mechanism for blast door opening, characterized by: Includes base (1), housing (2), locking arm (3), reset mechanism, unlocking mechanism and stop (10); The housing (2) is fixedly installed on the base (1); The locking arm (3) is rotatably mounted on the housing (2) via a pivot (4); The reset mechanism is disposed between the housing (2) and the locking arm (3) and is used to provide the locking arm (3) with an elastic reset force that makes it tend to rotate toward the locked position; The unlocking mechanism includes an electromagnet (9) and a connector (7); the electromagnet (9) is fixedly installed on the base (1); one end of the connector (7) is fixedly connected to the locking arm (3), and the other end is driven to the iron core (91) of the electromagnet (9); The stop block (10) is fixedly connected to the blasting door; The locking arm (3) has a locking position where it engages with the stop (10) under the drive of the reset mechanism to prevent the blast door from rebounding, and an unlocking position where it overcomes the reset force of the reset mechanism and separates from the stop (10) under the drive of the electromagnet (9).

2. The anti-rebound mechanism for use in the explosive door opening according to claim 1, characterized in that: The reset mechanism includes a spring mounting shaft (6) and a reset spring (5); One end of the spring mounting shaft (6) is fixed to the housing (2), and the other end extends into and slides into the preset mounting hole (31) on the locking arm (3); The reset spring (5) is sleeved outside the spring mounting shaft (6), and its two ends abut against the housing (2) and the locking arm (3) respectively.

3. The anti-rebound mechanism for opening a blast door according to claim 2, characterized in that: The mounting hole (31) is a variable diameter hole, with the inner diameter of the upper inner side being larger than that of the lower inner side, forming a stepped surface; the spring mounting shaft (6) has a shoulder at the upper inner side of the mounting hole (31), the diameter of which is larger than that of the lower inner side of the mounting hole (31), so that when the locking arm (3) rotates, the shoulder cooperates with the stepped surface to limit the rotation angle of the locking arm (3).

4. The anti-rebound mechanism for opening a blast door according to claim 2, characterized in that: The housing (2) is provided with a positioning hole or positioning boss for accommodating and positioning one end of the reset spring (5).

5. The anti-rebound mechanism for opening a breaching door according to claim 2, characterized in that: The spring mounting shaft (6) is threadedly connected to the housing (2).

6. The anti-rebound mechanism for opening a blast door according to claim 1, characterized in that: The electromagnet (9) has a guide groove at the end of the iron core (91) and a connecting pin (8) is provided horizontally in the guide groove; the end of the connector (7) connected to the iron core (91) of the electromagnet (9) has an elongated hole, which is fitted on the connecting pin (8) and can move up and down along the connecting pin (8) in the guide groove.

7. The anti-rebound mechanism for opening a blast door according to claim 1, characterized in that: A bearing is provided between the locking arm (3) and the shaft (4).

8. The anti-rebound mechanism for opening a blast door according to claim 1, characterized in that: The locking arm (3), housing (2) and base (1) are all made of high-strength structural steel.

9. The anti-rebound mechanism for opening a breaching door according to any one of claims 1-8, characterized in that: The contact surfaces of the stop (10) and the locking arm (3) are complementary in shape and have a fitting structure.

10. The anti-rebound mechanism for opening a blast door according to claim 9, characterized in that: The fitting structure includes a protrusion (32) on the top of the locking arm (3) and a groove (101) on the bottom of the stop (10).

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