Emergency power-off protection mechanical locking structure of industrial control system

Abstract

The utility model relates to the technical field of power-off protection, in particular to an emergency power-off protection mechanical locking structure of an industrial control system, which comprises a circuit breaker body internally provided with an opening and closing handle used for operating a circuit breaker to reset; through the arrangement of the anti-reset mechanism and the locking mechanism, after a circuit is disconnected and the opening and closing handle deflects, the anti-reset mechanism can limit the opening and closing handle, so that the opening and closing handle is subjected to acting force opposite to the reset direction, the opening and closing handle is prevented from being reset under the action of accidental external force, and meanwhile, the opening and closing handle is prevented from being locked. When the circuit breaker is used in cooperation with the locking mechanism, the locking mechanism locks a moving part of the anti-reset mechanism, so that the opening and closing handle is fixed, the opening and closing handle is fixed and limited, non-maintenance personnel are prevented from conducting reset operation on the circuit breaker, the possibility of secondary damage to circuits and equipment is avoided, potential safety hazards after power failure are eliminated, and the service life of the circuit breaker is prolonged. And the use effect is better.

Description

Technical Field

[0001] This utility model relates to the field of power failure protection technology, specifically to a mechanical locking structure for emergency power failure protection of industrial control systems. Background Technology

[0002] In industrial control systems, emergency power-off protection devices are generally installed to ensure the safe operation of equipment. These devices automatically cut off power when a circuit fault occurs, thus protecting the safety of the equipment and preventing damage from the faulty circuit. The main equipment in such devices is the circuit breaker.

[0003] A search revealed a circuit breaker disclosed in patent document CN209328818U. The circuit breaker includes a housing and a locking mechanism installed within the housing for locking the circuit breaker. It also includes a microswitch connected to the circuit breaker's remote control circuit. The locking mechanism comprises a rotating assembly, a reset button, and a pull rod. The rotating assembly is linked to the reset button and the microswitch, and the reset button is linked to the pull rod. When the circuit breaker is locked, the rotating assembly actuates, causing the reset button to press against the pull rod, preventing the circuit breaker from tripping and closing. Simultaneously, the rotating assembly actuates, triggering the microswitch to disconnect the circuit breaker's remote control circuit. This invention effectively prevents operational errors by both on-site and remote operators when the circuit breaker is locked, preventing it from tripping and closing, and simultaneously triggering the microswitch to disconnect the circuit breaker's remote control circuit.

[0004] The aforementioned prior art solves the problem that on-site personnel and remote operators are prone to operational errors during maintenance, which can lead to safety hazards. However, it cannot guarantee that non-maintenance personnel can reset the circuit breaker after the circuit is disconnected. Resetting the circuit breaker may cause secondary damage to the circuit, which may pose certain safety hazards. Utility Model Content

[0005] The purpose of this invention is to provide a mechanical locking structure for emergency power failure protection in industrial control systems, so as to solve the problems mentioned in the background art.

[0006] The technical solution of this utility model is: an emergency power failure protection mechanical locking structure for industrial control systems, comprising:

[0007] The circuit breaker body is provided with an opening and closing handle for operating the circuit breaker reset.

[0008] An anti-reset mechanism is installed inside the circuit breaker body. The anti-reset mechanism is used to limit the opening and closing handle after the circuit is disconnected, so as to prevent the opening and closing handle from resetting.

[0009] The anti-reset mechanism acts as an auxiliary soft limiter for the opening and closing handle when the circuit is connected, making it less likely for the opening and closing handle to be touched and rotated by external force, thus causing the circuit to be disconnected.

[0010] A locking mechanism is used to completely lock the opening and closing handle in conjunction with an anti-reset mechanism after the circuit is disconnected;

[0011] The circuit breaker body has two openable housings, and the opening / closing handle, anti-reset mechanism, and locking mechanism are all installed inside the housings.

[0012] Preferably, the anti-reset mechanism includes:

[0013] A magnetic block, which is rotatably connected to the middle of the opening and closing handle via a connecting shaft;

[0014] An anti-reset spring, one end of which is fixed to the inner wall of the circuit breaker body, and the other end of which is fixed to one side of a magnetic block;

[0015] The anti-reset spring retracts in the tilting direction when the opening / closing handle is de-energized.

[0016] Preferably, the anti-reset mechanism further includes:

[0017] A winding coil, which is connected in parallel to a circuit within the circuit breaker body;

[0018] An electromagnetic block is movably disposed inside the winding coil, with one end of the electromagnetic block fixed to the end of the circuit breaker body housing away from the anti-reset spring.

[0019] When the circuit inside the circuit breaker body is connected, the winding coil is energized and causes the electromagnetic block to generate magnetic force, and the electromagnetic block and the magnetic block are magnetically attracted to each other.

[0020] When the circuit inside the circuit breaker body is disconnected, the winding coil is de-energized, causing the magnetic force of the electromagnetic block to disappear, and the electromagnetic block and the magnetic block are in a gap fit.

[0021] Preferably, the locking mechanism includes:

[0022] A fixing spring is provided, one end of which is fixed to the inner side of the circuit breaker body housing. The fixing spring is an elastic metal piece with the front end raised.

[0023] The latch is fixed to the front end of the fixing spring away from the side wall of the circuit breaker body;

[0024] The magnetic block has a locking hole. When the magnetic block retracts towards the circuit breaker body due to the elastic force of the anti-reset spring, the latch engages in the locking hole.

[0025] Preferably, the front end of the fixing spring is formed with an elastic bending portion, the middle part between the elastic bending portion and the fixing spring is the bending portion, and the latch is fixed to the front end of the elastic bending portion;

[0026] The front end of the elastic bending part forms a round head, and the latch is an inclined column that tilts away from the handle. The latch and the elastic bending part cooperate to form a hook.

[0027] The lower plane of the magnetic block is higher than the horizontal plane of the highest point of the elastic bending part.

[0028] Preferably, the locking mechanism further includes a support spring, one end of which is fixed to the back side of the circuit breaker body away from the latch, and the other end of which is fixed to the side of the elastic bending portion away from the latch.

[0029] This utility model provides an improved mechanical locking structure for emergency power failure protection in industrial control systems, which, compared with the prior art, has the following improvements and advantages:

[0030] This invention, through the inclusion of an anti-reset mechanism and a locking mechanism, limits the opening and closing handle after the circuit is disconnected and the handle deflects. This causes the handle to be subjected to a force opposite to the reset direction, thus preventing the handle from resetting under unexpected external force. Simultaneously, when used in conjunction with the locking mechanism, the locking mechanism locks the moving parts of the anti-reset mechanism, thereby fixing the handle and limiting its position. This prevents unauthorized personnel from resetting the circuit breaker, thus avoiding secondary damage to the circuit and equipment, eliminating potential safety hazards after power outages, and providing better performance. Attached Figure Description

[0031] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0032] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0033] Figure 2 This is a schematic diagram of the internal structure of the circuit breaker body of this utility model when it is opened;

[0034] Figure 3 This is a schematic diagram of the anti-reset mechanism of this utility model;

[0035] Figure 4 This is a schematic diagram of the locking mechanism of this utility model.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Circuit breaker body; 101. Opening / closing handle; 102. Terminal; 103. Bimetallic strip; 104. Arc extinguishing chamber; 105. Solenoid mechanical structure; 106. Main contact; 2. Anti-reset mechanism; 201. Winding coil; 202. Electromagnetic block; 203. Magnetic block; 2031. Locking hole; 204. Anti-reset spring; 205. Connecting shaft; 3. Locking mechanism; 301. Fixing spring; 3011. Elastic bending part; 302. Lock; 303. Support spring. Detailed Implementation

[0038] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only 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 protection scope of the present invention.

[0039] This utility model improves the mechanical locking structure for emergency power failure protection in industrial control systems. The technical solution of this utility model is as follows:

[0040] like Figures 1-4 As shown, the mechanical locking structure for emergency power failure protection of the industrial control system includes:

[0041] The circuit breaker body 1 contains an opening / closing handle 101 for resetting the circuit breaker. The circuit breaker body 1 also includes a terminal block 102 for connecting to the circuit, a bimetallic strip 103 for short-circuit protection, an arc-extinguishing chamber 104 for extinguishing arcing, a solenoid mechanical structure 105 for overload protection, and main contacts 106. One end of the solenoid mechanical structure 105 is rotatably connected to the opening / closing handle 101. From the above connection relationships, it can be seen that, in conjunction with the attached... Figure 2 When a current overload or short circuit occurs in the circuit, the main contact 106 is disconnected from the terminal 102 by the heating deformation of the bimetallic strip 103 and the mechanical circuit breaking of the solenoid mechanical structure 105, thereby playing a good emergency power-off protection role. When applied in industrial control systems, it can play a good protection role for equipment and prevent the equipment from being affected and damaged when the circuit fails.

[0042] Anti-reset mechanism 2 is installed inside the circuit breaker body 1. Anti-reset mechanism 2 is used to limit the opening and closing handle 101 after the circuit is disconnected to prevent the opening and closing handle 101 from resetting.

[0043] Among them, the anti-reset mechanism 2 plays an auxiliary soft limiting role on the opening and closing handle 101 when the circuit is connected, so that the opening and closing handle 101 is not easily touched by external force and rotated, causing the circuit to be disconnected.

[0044] Locking mechanism 3 is used to completely lock the opening and closing handle 101 in conjunction with anti-reset mechanism 2 after the circuit is disconnected;

[0045] The circuit breaker body 1 has two openable outer casings. The opening / closing handle 101, the anti-reset mechanism 2, and the locking mechanism 3 are all installed inside the casings. As can be seen from the above connection relationship, combined with the attached... Figure 1 and attached Figure 2 When the circuit is disconnected and the opening / closing handle 101 deflects, the anti-reset mechanism 2 can limit the opening / closing handle 101, so that the opening / closing handle 101 is subjected to a force in the opposite direction of reset, thereby preventing the opening / closing handle 101 from being reset under the action of an unexpected external force. At the same time, when used in conjunction with the locking mechanism 3, the locking mechanism 3 locks the moving parts of the anti-reset mechanism 2, thereby fixing the opening / closing handle 101. This fixes and limits the opening / closing handle 101, thereby preventing non-maintenance personnel from performing reset operations on the circuit breaker, which could cause secondary damage to the circuit and equipment, and eliminate potential safety hazards after power failure, resulting in better performance.

[0046] It should be noted that after the circuit is repaired, the maintenance personnel can open the outer casing of the circuit breaker body 1, thereby releasing the anti-reset mechanism 2 and the locking mechanism 3 from limiting the opening and closing handle 101, achieving the purpose of resetting. Although this brings some inconvenience to the resetting operation, it effectively improves safety and can avoid greater safety hazards and losses in actual use.

[0047] Furthermore, the anti-reset mechanism 2 includes:

[0048] Magnetic block 203 is rotatably connected to the middle of opening and closing handle 101 via connecting shaft 205;

[0049] Anti-reset spring 204, one end of anti-reset spring 204 is fixed to the inner wall of the outer shell of circuit breaker body 1, and the other end of anti-reset spring 204 is fixed to one side of magnetic block 203;

[0050] The anti-reset spring 204 retracts in the tilting direction when the opening / closing handle 101 is de-energized. As can be seen from the above connection relationship, combined with the attached... Figure 1 and attached Figure 2 When the circuit is disconnected, the magnetic block 203 moves in the tilt direction of the opening and closing handle 101 when it is de-energized under the elastic force of the anti-reset spring 204, thus moving synchronously with the opening and closing handle 101. Under the elastic force of the anti-reset spring 204, it always has the tendency to move in this direction. When the opening and closing handle 101 is touched by an external force and moves in the reset direction, the tension of the anti-reset spring 204 makes it difficult for it to move. Moreover, when the external force is not large, it is difficult to have a sufficient reset distance, thus achieving the elastic limiting effect and preventing the opening and closing handle 101 from resetting.

[0051] Furthermore, the anti-reset mechanism 2 also includes:

[0052] The winding coil 201 is connected in parallel to the circuit inside the circuit breaker body 1;

[0053] Electromagnetic block 202 is movably disposed inside the winding coil 201. One end of electromagnetic block 202 is fixed to the end of the circuit breaker body 1 housing away from the anti-reset spring 204.

[0054] From the above connection relationship, it can be seen that, combined with the appendix Figure 2 and attached Figure 3 When the circuit inside the circuit breaker body 1 is connected, the winding coil 201 is energized, causing the electromagnetic block 202 to generate magnetic force, and the electromagnetic block 202 and the magnetic block 203 are magnetically attracted to each other. When the circuit inside the circuit breaker body 1 is disconnected, the winding coil 201 is de-energized, causing the magnetic force of the electromagnetic block 202 to disappear, and the electromagnetic block 202 and the magnetic block 203 are gap-fitted, so that the magnetic block 203 is not attracted when the power is off, but is attracted when the power is on, so that the magnetic block 203 always has a tendency to move towards the electromagnetic block 202, thereby achieving an auxiliary soft limit effect on the opening and closing handle 101, making it less likely for the opening and closing handle 101 to be touched by external force and cause the circuit to be disconnected. This not only prevents the opening and closing handle 101 from resetting in the power-off state, but also reduces the probability of the opening and closing handle 101 being touched by external force and causing the power to be disconnected in the power-on state, thus playing a dual and dual auxiliary protection role.

[0055] Furthermore, the locking mechanism 3 includes:

[0056] The fixing spring 301 is fixed at one end to the inner side of the outer shell of the circuit breaker body 1. The fixing spring 301 is an elastic metal piece with the front end raised.

[0057] The latch 302 is fixed to the front end of the fixing spring 301 away from the side wall of the circuit breaker body 1;

[0058] The magnetic block 203 has a locking hole 2031. When the magnetic block 203 retracts to the side of the circuit breaker body 1 under the influence of the spring force of the anti-reset spring 204, the latch 302 is engaged in the locking hole 2031.

[0059] Among them, the front end of the fixed spring 301 is formed with an elastic bending part 3011, the middle part between the elastic bending part 3011 and the fixed spring 301 is the bending part, and the latch 302 is fixed to the front end of the elastic bending part 3011.

[0060] The front end of the elastic bending part 3011 forms a round head, and the latch 302 is an inclined column that tilts away from the handle 101. The latch 302 and the elastic bending part 3011 cooperate to form a hook.

[0061] The lower plane of the magnetic block 203 is higher than the horizontal plane of the highest point of the elastic bending part 3011. From the above connection relationship, it can be seen that, combined with the attached... Figure 2 -Appendix Figure 4 When the magnetic block 203 retracts towards the circuit breaker body 1 under the influence of the spring force of the anti-reset spring 204, one side of the magnetic block 203 first abuts against the round head of the front end of the elastic bending part 3011 and presses down the elastic bending part 3011, further pressing down the latch 302, and finally causing the locking hole 2031 to move to the position corresponding to the latch 302. At this time, the elastic bending part 3011 tilts up under its own bending spring force, and the latch 302 is locked in the locking hole 2031, thereby fixing and limiting the magnetic block 203, achieving the purpose of fixing and limiting the opening and closing handle 101, preventing the opening and closing handle 101 from being reset by external force, thus completely eliminating the possibility of the opening and closing handle 101 being reset, and ensuring high safety and reliability.

[0062] Furthermore, the locking mechanism 3 also includes a support spring 303. One end of the support spring 303 is fixed to the back side of the circuit breaker body 1 away from the latch 302, and the other end of the support spring 303 is fixed to the side of the elastic bending portion 3011 away from the latch 302. From the above connection relationship, it can be seen that, combined with the attached... Figure 4 The support spring 303 can assist in supporting the elastic bending part 3011 and can compensate for the elastic force of the elastic bending part 3011, thereby making the latch 302 more stable when locking the magnetic block 203, and improving its own reliability and stability.

[0063] Specifically, the working principle is as follows: When an overload or short circuit occurs in the circuit, the main contact 106 is disconnected from the terminal 102 due to the heating and deformation of the bimetallic strip 103 and the mechanical circuit breaking of the solenoid mechanical structure 105, thus playing a good role in emergency power-off protection. When applied in industrial control systems, it can play a good role in protecting equipment and prevent equipment from being affected and damaged when the circuit fails. After the circuit is disconnected and the opening and closing handle 101 deflects, the magnetic block 203 moves in the tilt direction of the opening and closing handle 101 when it is de-energized under the elastic force of the anti-reset spring 204, thus moving synchronously with the opening and closing handle 101. Under the elastic force of the anti-reset spring 204, it always has the tendency to move in this direction. When the opening and closing handle 101 is touched by an external force and moves in the reset direction, the tension of the anti-reset spring 204 makes it difficult for it to move. When the external force is not large, it is difficult to have a sufficient reset distance, thus achieving an elastic limiting effect and preventing the opening and closing handle 101 from resetting.

[0064] In addition, when the magnetic block 203 retracts towards the circuit breaker body 1 under the influence of the spring force of the anti-reset spring 204, one side of the magnetic block 203 first abuts against the round head of the front end of the elastic bending part 3011 and presses down the elastic bending part 3011, further pressing down the latch 302, and finally causing the locking hole 2031 to move to the position corresponding to the latch 302. At this time, the elastic bending part 3011 tilts up under its own bending spring force, and the latch 302 is locked in the locking hole 2031, thereby fixing and limiting the magnetic block 203, achieving the purpose of fixing and limiting the opening and closing handle 101, preventing the opening and closing handle 101 from being reset by external force, thus completely eliminating the possibility of the opening and closing handle 101 being reset, with high safety and reliability. This fixes and limits the opening and closing handle 101, thereby preventing non-maintenance personnel from performing reset operations on the circuit breaker, which could cause secondary damage to the circuit and equipment, eliminate potential safety hazards after power failure, and improve the performance.

Claims

1. A mechanical locking structure for emergency power-off protection of an industrial control system, characterized in that, The application relates to a circuit breaker, which comprises the following parts: a circuit breaker body (1) provided with an opening and closing handle (101) for operating the reset of the circuit breaker; a reset prevention mechanism (2) installed in the circuit breaker body (1) and used for limiting the opening and closing handle (101) after the circuit is disconnected, so as to prevent the reset of the opening and closing handle (101); wherein the reset prevention mechanism (2) plays a supplementary soft limiting role on the opening and closing handle (101) when the circuit is connected, so that the opening and closing handle (101) is not easily rotated by external force to cause the circuit to be disconnected; a locking mechanism (3) used for cooperating with the reset prevention mechanism (2) to completely lock the opening and closing handle (101) after the circuit is disconnected; wherein the circuit breaker body (1) is provided with two openable shells, and the opening and closing handle (101), the reset prevention mechanism (2) and the locking mechanism (3) are all installed in the shells.

2. The emergency power-off mechanical locking structure of the industrial control system according to claim 1, characterized in that, The reset prevention mechanism (2) comprises: a magnetic block (203) rotationally connected with the middle part of the opening and closing handle (101) through a connecting shaft (205); a reset prevention spring (204) fixed at one end to the inner side wall of the shell of the circuit breaker body (1) and at the other end to one side of the magnetic block (203); the reset prevention spring (204) is contracted towards the inclined direction of the opening and closing handle (101) when the circuit is disconnected.

3. The emergency power-off mechanical locking structure of the industrial control system according to claim 2, characterized in that, The reset prevention mechanism (2) further comprises: a winding coil (201) connected in parallel to the circuit in the circuit breaker body (1); an electromagnetic block (202) movably arranged in the interior of the winding coil (201), and fixed at one end to the end of the shell of the circuit breaker body (1) away from the reset prevention spring (204); wherein when the circuit in the circuit breaker body (1) is connected, the winding coil (201) is electrified and the electromagnetic block (202) generates magnetic force, and the electromagnetic block (202) is magnetically attracted to the magnetic block (203); when the circuit in the circuit breaker body (1) is disconnected, the winding coil (201) is de-energized and the magnetic force of the electromagnetic block (202) disappears, and the electromagnetic block (202) is gapingly matched with the magnetic block (203).

4. The emergency power-off mechanical locking structure of the industrial control system according to claim 3, characterized in that, The locking mechanism (3) comprises: a fixed spring sheet (301) fixed at one end to the inner side of the shell of the circuit breaker body (1), and the fixed spring sheet (301) is an elastic metal sheet with the front end upturned; a lock (302) fixed to the front end of the fixed spring sheet (301) away from the side wall of the circuit breaker body (1); a locking hole (2031) is formed in the magnetic block (203), and when the magnetic block (203) is contracted to one side of the circuit breaker body (1) under the influence of the elastic force of the reset prevention spring (204), the lock (302) is clamped in the locking hole (2031).

5. The emergency power-off mechanical locking structure of the industrial control system according to claim 4, characterized in that, The fixed elastic sheet (301) is formed with an elastic bending part (3011) at the front end, the middle part between the elastic bending part (3011) and the fixed elastic sheet (301) is a bending part, and the lock (302) is fixed at the front end of the elastic bending part (3011). The front end of the elastic bending part (3011) is formed with a round head part, the lock (302) is an inclined column body inclined to the side away from the closing handle (101), and the lock (302) and the elastic bending part (3011) cooperate to form a hook body. The lower end plane of the magnetic block (203) is higher than the horizontal plane of the highest point of the elastic bending part (3011).

6. The emergency power-off mechanical locking structure of the industrial control system according to claim 5, characterized in that, The locking mechanism (3) further comprises a supporting spring (303), one end of the supporting spring (303) is fixed to the back side of the circuit breaker body (1) away from the lock (302), and the other end of the supporting spring (303) is fixed to the side of the elastic bending part (3011) away from the lock (302).

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