A safety interlock system

Abstract

The application discloses a safety interlocking system, which comprises a driver's cabin fault switch group, a grounding switch interlocking device and a key lock device; the driver's cabin fault switch is the upper stage of the grounding switch interlocking device; when the motor train unit enters a depot for maintenance, the key of the driver's cabin fault switch is taken out, inserted into the lock core of the grounding switch interlocking device and rotated to unlock the next stage, and meanwhile, the grounding switch interlocking device is locked in the grounding position; the grounding switch interlocking device is the upper stage of the key lock device; after the grounding switch interlocking device is locked in the grounding position, another key is taken out, inserted into the lock core of the key lock device and rotated to drive the sliding block to move, so that the padlock can lock the sliding block. The safety interlocking system is safer and more reliable, and through the interlocking relationship between the upper and lower stages, the operator can be prevented from being electrocuted due to misoperation or mistaken entry into a live area.

Description

Technical Field

[0001] This invention relates to the field of electromechanical interlocking technology, specifically to a safety interlocking system that can ensure both equipment safety and the safety of operators. Background Technology

[0002] Interlocking devices are part of the safety interlocking system of high-speed trains and are devices that protect the safety of maintenance personnel during operations.

[0003] Currently, the high-speed trains use a method where the pantograph's gas and electrical circuits are disconnected by operating the high-voltage interlock key box, and the high-voltage equipment box can only be opened after the grounding switch is closed. However, there is a risk of injury to the operator from others. That is, when two people are working at the same time, the person working may be accidentally locked into the box by the other person, causing injury after the equipment is powered on. Summary of the Invention

[0004] In view of the above-mentioned problems in the prior art, the present invention provides a safety interlock system that can ensure both equipment safety and the safety of operators.

[0005] This invention discloses a safety interlocking system, comprising: a driver's cab fault switch group, a grounding switch interlocking device, and a key locking device;

[0006] The driver's cab fault switch group includes at least one first fault switch that cooperates with a first key and a second fault switch that cooperates with a third key. The first key or the third key can be rotated but cannot be removed when the corresponding fault switch is in the "open" and "closed" positions, and can be rotated or removed when it is in the "locked" position.

[0007] The grounding unlocking and locking device includes a first lock B that cooperates with the first key, a second lock A with a second key inserted, and a handle that can switch between a "normal position" and a "grounded position". The first lock B, the handle, and the second lock A are linked together. In the normal state, the first lock B is in the "locked position" and the handle is locked in the "normal position", the second lock A is in the "released position" and the second key can be rotated but cannot be removed. In the maintenance state, the first lock B is inserted with the first key and switched to the "released position" and the first key can be rotated but cannot be removed. The handle is switched to the "grounded position", the second lock A is in the "locked position" and the second key can be rotated or removed.

[0008] The key locking device includes a third panel, on which a second lock B that cooperates with the second key and a third lock B that cooperates with the third key are provided. The second lock B is linked with a first baffle on the back of the third panel, and the third lock B is linked with a second baffle on the back of the third panel. When the lock holes on the third panel, the first baffle, and the second baffle are aligned, a padlock is inserted to lock the second key and the third key.

[0009] As a further improvement of the present invention, the first fault switch or the second fault switch includes: a panel;

[0010] The first panel is provided with the "open position", "closed position" and "locked position", with the "closed position" located between the "open position" and the "locked position";

[0011] The first panel is equipped with a first lock A that cooperates with the first key or a third lock A that cooperates with the third key. The first lock A or the third lock A is connected to a contact assembly that realizes open, close, and lock signal feedback through a first dial.

[0012] As a further improvement of the present invention, the grounding switch interlocking device further includes: a second panel, a button display switch, an air valve component, a cam, a slide rail, an electromagnet, a second dial, a first slider, a third dial, and a second slider;

[0013] The front of the second panel is provided with the button display switch, the first lock B, the second lock A and the handle, and the back of the second panel is provided with the air valve component, cam, slide rail, electromagnet, second dial, first slider, third dial and second slider.

[0014] The first lock B is driven by the second slider through the third dial, and the second lock A is driven by the first slider through the second dial. The first slider and the second slider slide left and right in the slide rail. A suction plate is fixed on the first slider and extends out of the slide rail. The moving iron core of the electromagnet is attracted to the suction plate when it is not energized. The coil of the electromagnet is electrically connected to the button display switch.

[0015] The cam is connected to the central shaft of the handle disc. The cam includes a first wheel and a second wheel arranged in parallel. The first wheel or the second wheel is provided with two slots that cooperate with the first slider and the second slider. The first wheel acts on the first valve stem of the air circuit valve component, and the second wheel acts on the second valve stem of the air circuit valve component. When the handle disc is in the "normal position", the second slider extends and is locked in one slot. The first valve stem of the air circuit valve component is squeezed to open the ES split air circuit, and the second valve stem is not squeezed to close the ES combined air circuit. When the handle disc is in the "closed position", the first slider extends and is locked in the other slot. The first valve stem of the air circuit valve component is not squeezed to close the ES split air circuit, and the second valve stem is squeezed to open the ES combined air circuit.

[0016] As a further improvement of the present invention, the grounding unlocking interlocking device further includes: an indicator light and a connector;

[0017] The connector is connected to the indicator light and the button indicator switch. When the handle is in the "normal position", the indicator light is on and the button indicator switch is off; when the handle is in the "closed position", the indicator light is off and the button indicator switch is on.

[0018] As a further improvement of the present invention, the first baffle, the second baffle, and the third panel are arranged in parallel, with the first baffle positioned between the second baffle and the third panel. The first baffle and the second baffle are mounted on the third panel and can move left and right via support columns. The lock cylinder of the second lock B is linked to the first baffle via a fourth dial, and the lock cylinder of the third lock B is linked to the second baffle via a fourth dial.

[0019] As a further improvement of the present invention, the third panel is provided with two sets of circular holes, the first baffle is provided with two sets of circular holes, and the second baffle is provided with a set of elongated holes and a set of circular holes.

[0020] When neither the second lock B nor the third lock B has a key inserted, the two sets of keyholes on the third panel, the first baffle, and the second baffle are not aligned.

[0021] When the second key is inserted into the second lock B while the third key is not inserted into the third lock B, one set of lock holes on the third panel, the first baffle, and the second baffle are aligned, while the other set of lock holes are not aligned.

[0022] When the second key is not inserted into the second lock B and the third key is inserted into the third lock B, the two sets of lock holes on the third panel, the first baffle and the second baffle are not aligned;

[0023] When both the second lock B and the third lock B are inserted with keys, the two sets of lock holes on the third panel, the first baffle, and the second baffle are aligned.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] When using the safety interlocking system of this invention, the operator must first disconnect the circuit by operating the fault switch in the driver's cab, then switch the interlocking device from the normal position to the grounded position by operating the grounding switch to close the ES and reliably ground it, while disconnecting the pantograph air circuit and electrical circuit. Finally, the key locking device is switched to open the locking hole, and the maintenance personnel lock the position with the padlock to ensure that the vehicle status remains unchanged. When there are multiple people, all of them must return before the locking state can be released, thus ensuring the safety of the equipment and personnel. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a safety interlocking system disclosed in one embodiment of the present invention;

[0027] Figure 2 This is a front view of a first fault switch or a second fault switch in a safety interlocking system disclosed in an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Side view;

[0029] Figure 4 for Figure 2 Top view;

[0030] Figure 5 This is a front view of a grounding interlocking device in a safety interlocking system disclosed in an embodiment of the present invention;

[0031] Figure 6 for Figure 5 A schematic diagram of the rear view from a mid-angle perspective;

[0032] Figure 7 for Figure 5 A rear view from another angle;

[0033] Figure 8 This is a front view of a key locking device in a security interlocking system disclosed in an embodiment of the present invention;

[0034] Figure 9 for Figure 8 A diagram of the back of the building;

[0035] Figure 10 for Figure 8 A schematic diagram of the first and second baffles.

[0036] In the picture:

[0037] 10. Fault switch; 11. First panel; 12. First lock A; 13. Contact assembly; 14. First dial; 15. First key; 16. Third lock A; 17. Third key;

[0038] 20. Grounding interlocking device; 21. Second panel; 22. Push-button display switch; 23. Indicator light; 24. First lock B; 25. Second lock A; 26. Handle disc; 27. Second key; 28. Pneumatic valve assembly; 29. ​​Cam; 210. Slide rail; 211. Connector; 212. Electromagnet; 213. Second dial; 214. First slider; 215. Third dial; 216. Second slider;

[0039] 30. Key locking device; 31. Third panel; 32. Second lock B; 33. Third lock B; 34. Fourth dial; 35. Support column; 36. First baffle; 37. Second baffle. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, 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.

[0041] The present invention will now be described in further detail with reference to the accompanying drawings:

[0042] like Figure 1 As shown, the present invention provides a safety interlocking system, including: a driver's cab fault switch group, two grounding switch interlocking devices 20, and a key locking device 30; wherein,

[0043] The driver's cab fault switch group includes two first fault switches 10 that cooperate with the first key 15 and one second fault switch 10 that cooperates with the third key 17. The second fault switch 10 serves as the main fault switch. The first key 15 or the third key 17 can be rotated but cannot be removed when it is in the "open" or "closed" position of the corresponding fault switch, and can be rotated or removed when it is in the "locked" position. The above design ensures that the first key 15 or the third key 17 can only be removed when switched to the "locked" position.

[0044] Both grounding interlocking devices 20 include a first lock B24 that cooperates with the first key 15, a second lock A25 with a second key 27 inserted, and a handle 26 that can switch between a "normal position" and a "grounded position". The first lock B24, the handle 26, and the second lock A25 are linked together. In normal operation, the first lock B24 is in the "locked position" and locks the handle 26 in the "normal position", while the second lock A25 is in the "released position" and the second key 27 can rotate within the second lock A25 but cannot be removed. In maintenance operation, the first lock B24... 4. Insert the first key 15 removed from the first fault switch 10, and rotate the first key 15 to switch it from the "locked position" to the "release position". At this time, the first key 15 can be rotated in the "locked position" but cannot be removed and the lock on the handle 26 is released. The handle 26 can be switched from the "normal position" to the "closed position". Rotate the second key 27 to switch the second lock A25 from the "release position" to the "locked position". In the "locked position", the second key 27 can be rotated or removed. The above design ensures that the second key 27 can be removed through the linkage of the first key 15.

[0045] The key locking device 30 includes a second lock B32 that cooperates with the second key 27 and a third lock B33 that cooperates with the third key 17. The second lock B32 is linked with the first baffle 36 on the back of the third panel 31, and the third lock B33 is linked with the second baffle 37 on the back of the third panel 31. When the lock holes on the third panel 31, the first baffle 36 and the second baffle 37 are aligned, a padlock is inserted to lock the second key 27 and the third key 17.

[0046] The driver's cab fault switch 10 of the present invention is the upper stage of the grounding switch interlocking device 20. After the key of the driver's cab fault switch is taken out when the EMU enters the depot for maintenance, it can be inserted into the lock cylinder of the grounding switch interlocking device and rotated to unlock the next stage, while ensuring that the grounding switch interlocking device is locked in the grounding position. The grounding switch interlocking device 20 is the upper stage of the key locking device 30. After the grounding switch interlocking device 20 is locked in the grounding position, the second key 27 is taken out and can be inserted into the lock cylinder of the key locking device 30 and rotated to drive the slider to move, ensuring that the padlock can lock the slider.

[0047] Specifically:

[0048] like Figure 2-4As shown, the first fault switch 10 or the second fault switch 10 of the present invention both include: a panel 11, on which are provided an "open position", a "closed position" and a "locked position", with the "closed position" positioned between the "open position" and the "locked position"; a first lock A12 that cooperates with the first key 15 or a third lock A16 that cooperates with the third key 17 is installed on the first panel 11, and the lock cylinder of the first lock A12 or the third lock A17 is connected to the contact assembly 13 that realizes open, close, and lock signal feedback through the first dial 14; wherein, the "open position" is a normal position signal, the "locked position" is a maintenance position signal, and the "closed position" is a signal... The switching position switches the normal position signal to the maintenance position signal; when the first key 15 or the third key 17 is in the "open" position, the unit operates normally; when the first key 15 or the third key 17 is in the "closed" position, the unit is shut down; when the first key 15 or the third key 17 is in the "locked" position, the unit needs to be maintained; based on the above design, the first key 15 or the third key 17 can only be removed when switched to the "locked" position, for subsequent linkage with the grounding switch interlocking device 20 and the key locking device 30, otherwise the grounding switch interlocking device 20 and the key locking device 30 cannot be switched or used normally.

[0049] like Figure 5-7 As shown, the grounding interlocking device 20 of the present invention includes a second panel 21, a button display switch 22, an indicator light 23, a first lock B24, a second lock A25, a handle 26, a second key 27, an air valve component 28, a cam 29, a slide rail 210, a connector 211, an electromagnet 212, a second dial 213, a first slider 214, a third dial 215, and a second slider 216. The front of the second panel 21 is provided with the button display switch 22, the indicator light 23, the first lock B24, the second lock A25, the handle 26, and an indicator plate showing the switching positions of the first lock B24, the second lock A25, and the handle 26 when in "normal position" and "grounding position". The back of the second panel 21 is provided with the air valve component 28, the cam 29, the slide rail 210, the connector 211, the electromagnet 212, the second dial 213, the first slider 214, the third dial 215, and the second slider 216. The first lock B24 and the second lock A25 have two switching positions, namely "release position" and "locked position". In the "locked position", the corresponding first key 15 and second key 27 on the first lock B24 and the second lock A25 can be rotated and removed. In the "release position", the corresponding first key 15 and second key 27 on the first lock B24 and the second lock A25 can only be rotated and cannot be removed. The handle 26 has two switching positions, namely "normal position" and "engaged position". Under normal working conditions, the first lock B24 is in the "locked position", the second lock A25 is in the "release position", and the handle 26 is in the "normal position". Under maintenance conditions, the first lock B24 is in the "release position", the second lock A25 is in the "locked position", and the handle 26 is in the "engaged position".

[0050] The first lock B24 of this invention is driven by the second slider 216 through the third dial 215, and the second lock A25 is driven by the first slider 214 through the second dial 213. The first slider 214 and the second slider 216 are slidably disposed in the slide rail 210. A suction plate extending out of the slide rail is fixed on the first slider 214. When the moving iron core of the electromagnet 212 is not energized, it is attracted to the suction plate. The coil of the electromagnet 212 is electrically connected to the button display switch (which has the dual function of a button display switch and an indicator light) 22. The cam 29 is connected to the central shaft of the handle disc 26. The cam 29 includes a first wheel body and a second wheel arranged in parallel. The first wheel body is positioned between the first wheel body and the second panel 21. The second wheel body has two slots that cooperate with the first slider 214 and the second slider 216. The first wheel body acts on the first valve stem of the air circuit valve component 28, and the second wheel body acts on the second valve stem of the air circuit valve component 28. When the handle 26 is in the "normal position", the first valve stem of the air circuit valve component 28 is squeezed to open the ES split air circuit, and the second valve stem is not squeezed to close the ES combined air circuit. When the handle 26 is in the "closed position", the first valve stem of the air circuit valve component 28 is not squeezed to close the ES split air circuit, and the second valve stem is squeezed to open the ES combined air circuit. Connector 211 is connected to indicator light 23 and push-button indicator switch 22. Handle 26 transmits display signals to indicator light 23 and push-button indicator switch 22 by switching between normal position and connected position. The signal is output by connector 211, thereby controlling the grounding and disconnection of ES. ES disconnection is the normal position signal, and ES connection is the maintenance position signal. When handle 26 is in the "normal position", indicator light 23 is on and push-button indicator switch 22 is off. When handle 26 is in the "connected position", indicator light 23 is off and push-button indicator switch 22 is on.

[0051] The working principle of the grounding unlocking interlocking device 20 of the present invention is as follows:

[0052] When the EMU is running normally: indicator light 23 is on (ES is off, meaning ES is open), handle 26 is locked in the normal position and cannot be turned, and second key 27 cannot be turned or removed from second lock A25.

[0053] When the EMU is entering the depot for maintenance: Indicator light 23 illuminates (ES disconnected, meaning ES is open). Insert the first key 15 into the first lock B24. The first key 15 rotates, causing the lock cylinder of the first lock B24 to rotate. The lock cylinder rotates the third dial 215, which in turn moves the second slider 216 to unlock the cam 29. After the cam 29 is unlocked, the handle 26 can be rotated from the normal position to the contact position. At this time, the ES disconnect air circuit is disconnected, the ES connection air circuit is open, and after ES is grounded, indicator light 23 goes out while the button indicator switch 22 illuminates. Then, press and hold the button to open the indicator switch. When switch 22 is turned on, electromagnet 212 is energized. When electromagnet 212 is energized, it attracts the moving iron core and unlocks the first slider 214. At the same time, the second key 27 is turned, which drives the lock cylinder of the second lock A25 to rotate. The lock cylinder drives the second dial 213 to rotate. The second dial 213 drives the first slider 214 to move and lock the cam 29. When the button display switch 22 is released, electromagnet 212 is de-energized. After electromagnet 212 is de-energized, the moving iron core returns to its original position. The first slider 214 is locked by electromagnet 212 and cannot move. At the same time, after the second key 27 is removed, the handle 26 is locked in the contact position and cannot be rotated.

[0054] After the EMU maintenance is completed: The indicator light 22 illuminates, and indicator light 23 goes out. Insert the second key 27 into the second lock A25. While holding down the indicator light 22, energize the electromagnet 212. When energized, the electromagnet 212 attracts the moving iron core, unlocking the first slider 214. Simultaneously, turning the second key 27 rotates the lock cylinder of the second lock A25, which in turn rotates the second dial 213. The second dial 213 moves the first slider 214 and unlocks the cam 29. Releasing the indicator light 22 de-energizes the electromagnet 212, and the moving iron... When the core is reset, the first slider 214 is locked by the electromagnet 212 and cannot move. Then, the handle 26 is rotated from the contact position to the normal position. At this time, the ES gas circuit is disconnected and the ES gas distribution circuit is open. After the ES is disconnected, wait until the button display switch 22 goes out and the display light 23 comes on. Then, turn the first key 15. The first key 15 rotates and drives the lock cylinder of the first lock B to rotate. The lock cylinder drives the third dial 215 to rotate. The third dial 215 drives the second slider 216 to move and lock the cam 29. After the first key 15 is removed, the handle 26 is locked in the normal position and cannot be rotated.

[0055] like Figure 8-10As shown, the key locking device 30 of the present invention includes a third panel 31, a second lock B32, a third lock B33, a fourth dial 34, a support column 35, a first baffle 36, and a second baffle 37. The third panel 31 has two second locks B32 and B33. A set of lock holes is located on the right side of the second lock B32, and a set of lock holes is located on the right side of the third lock B33. The number and shape of the lock holes can be selected according to actual needs. The set of lock holes selected in this invention includes two rows of eight circular holes arranged vertically and perpendicularly. The first baffle 36, the second baffle 37, and the third panel 31 are arranged parallel to each other, with the first baffle 36 positioned between the second baffle 37 and the third panel 31. The first baffle 36 and the second baffle 37 are movable left and right on the third panel 31 via the support column 35. The lock cylinder of the second lock B32 is linked to the first baffle 36 via the fourth dial 34, and the lock cylinder of the third lock B33 is linked to the second baffle 37 via the fourth dial 34. Figure 10 As shown, the two holes on the left side of the first baffle 36 of the present invention are the insertion holes of the fourth dial 34 of the second lock B32, and the two holes on the left side of the second baffle 37 are the clearance holes of the fourth dial 34 of the second lock B32. That is, turning the second key 27 can move the first baffle 36 left and right, but will not affect the second baffle 37. The first baffle 36 is provided with two sets of lock holes, each set of lock holes consisting of two rows of eight round holes arranged vertically opposite each other. During the movement of the first baffle 36, the two sets of lock holes on the first baffle 36 can correspond to the two sets of lock holes on the third panel 31. The second baffle 37 is provided with a set of elongated holes and a set of lock holes. The set of elongated holes consists of two holes arranged vertically. The elongated holes correspond to the positions of a set of lock holes on the first baffle 36 and the third panel 31. This design ensures that the second baffle 37 does not affect the internal and external passage after the lock holes on the first baffle 36 and the third panel 31 are aligned. The set of lock holes on the second baffle 37 consists of two rows of eight round holes arranged vertically and oppositely. During the movement of the second baffle 37, the set of lock holes on the second baffle 37 can align with the corresponding set of lock holes on the first baffle 36 and the third panel 31. Each maintenance worker has one padlock. When the holes on the third panel 31, the first baffle 36, and the second baffle 37 are aligned, the padlock can pass through the round holes and lock, preventing the key from being removed or turned.

[0056] The working principle of the key locking device of this invention is as follows:

[0057] When none of the three locks on the third panel 31 (two second locks B32 and one third lock B33) have keys, both sets of lock holes are blocked. When the keys of the two second locks B32 are simultaneously inserted into the lock cylinder and rotated 90°, and the third lock B33 has no key, the first set of lock holes (left lock hole) is aligned with the holes of the first baffle 36 and the second baffle 37, while the holes of the first baffle 36 and the second baffle 37 of the second set of lock holes (right lock hole) are blocked. When neither of the two second locks B32 has a key, the key of the third lock B33 cannot be turned after being inserted, and both sets of lock holes are blocked. When all three keys on the panel are inserted into the lock cylinder and rotated 90°, and when all three locks on the third panel 31 have keys inserted, both sets of lock holes are connected.

[0058] When there is one or more padlocks in the right round hole of each of the two second locks B32 and one or more padlocks in the right round hole of each of the three locks B33, the keys of all three locks cannot be removed or turned. When there is one or more padlocks in the right round hole of each of the two second locks B32 and no padlock in the right round hole of each of the three locks B33, the key of the second lock B32 cannot be removed or turned, but the key of the third lock B33 can be inserted, turned, or removed. When there is no padlock in the right round hole of each of the two second locks B32 and one or more padlocks in the right round hole of each of the three locks B33, the keys of all three locks cannot be removed or turned.

[0059] The method of using this invention is as follows:

[0060] Under normal conditions, the two first keys 15 are locked on the first lock A12 of the two first fault switches, and the third key 17 is locked on the third lock A16 of the second fault switch; the two second keys 27 are locked on the second lock A of the two grounding switch interlocking devices 20.

[0061] When multiple maintenance personnel are required for repairs, the two first keys 15 and one third key 17 are used to switch the fault switch to the locked position. The two first keys 15 and one third key 17 are then removed. The two removed first keys 15 are inserted into the first lock B24 of their respective grounding interlocking devices 20, which, through linkage, switch the grounding interlocking devices to the grounded position. Only then can the second key 27 on the second lock A25 be removed. The two removed second keys 27 and one third key 17 are then inserted into the second lock B32 and third lock B33 of the key locking device 30, respectively. At this point, the corresponding keyholes are connected, and multiple maintenance personnel can enter for repairs by attaching padlocks to the keyholes. At this time, the two second keys 27 and one third key 17 are locked and cannot be removed.

[0062] After the maintenance is completed, all maintenance personnel remove the padlocks, and then unlock and remove the two second keys 27 and one third key 17 from the key locking device 30. The two removed second keys 27 are inserted into the second lock A25 of the grounding interlocking device 20, and the grounding interlocking device is switched to the normal position through linkage. Only then can the first key 15 on the first lock B24 be removed. The two removed first keys 15 are inserted into the first lock A12 of the first fault switch, and the removed third key 17 is inserted into the third lock A16 of the second fault switch, restoring the normal state.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A safety interlocking system, characterized in that, include: Driver's cab fault switch assembly, grounding switch interlocking device and key locking device; The driver's cab fault switch group includes at least one first fault switch that cooperates with a first key and a second fault switch that cooperates with a third key. The first key or the third key can be rotated but cannot be removed when the corresponding fault switch is in the "open" and "closed" positions, and can be rotated or removed when it is in the "locked" position. The grounding interlocking device includes a first lock B that cooperates with the first key, a second lock A with a second key inserted, and a handle that can switch between a "normal position" and a "grounded position". The first lock B, the handle, and the second lock A are linked together. In the normal state, the first lock B is in the "locked position" and the handle is locked in the "normal position", the second lock A is in the "released position" and the second key can be rotated but cannot be removed. In the maintenance state, the first lock B is inserted with the first key and switched to the "released position" and the first key can be rotated but cannot be removed. The handle is switched to the "grounded position", the second lock A is in the "locked position" and the second key can be rotated or removed. The key locking device includes a third panel, on which a second lock B that cooperates with the second key and a third lock B that cooperates with the third key are provided. The second lock B is linked with a first baffle on the back of the third panel, and the third lock B is linked with a second baffle on the back of the third panel. When the lock holes on the third panel, the first baffle, and the second baffle are aligned, a padlock is inserted to lock the second key and the third key.

2. The safety interlocking system as described in claim 1, characterized in that, The first fault switch or the second fault switch includes: a first panel; The first panel is provided with the "open position", "closed position" and "locked position", with the "closed position" located between the "open position" and the "locked position"; The first panel is equipped with a first lock A that cooperates with the first key or a third lock A that cooperates with the third key. The first lock A or the third lock A is connected to a contact assembly that provides open, close, and lock signal feedback via a first dial.

3. The safety interlocking system as described in claim 1, characterized in that, The grounding switch interlocking device further includes: a second panel, a button display switch, a pneumatic valve component, a cam, a slide rail, an electromagnet, a second dial, a first slider, a third dial, and a second slider; The front of the second panel is provided with the button display switch, the first lock B, the second lock A and the handle, and the back of the second panel is provided with the air valve component, cam, slide rail, electromagnet, second dial, first slider, third dial and second slider. The first lock B is driven by the second slider through the third dial, and the second lock A is driven by the first slider through the second dial. The first slider and the second slider slide left and right in the slide rail. A suction plate is fixed on the first slider and extends out of the slide rail. The moving iron core of the electromagnet is attracted to the suction plate when it is not energized. The coil of the electromagnet is electrically connected to the button display switch. The cam is connected to the central shaft of the handle disc. The cam includes a first wheel and a second wheel arranged in parallel. The first wheel or the second wheel is provided with two slots that cooperate with the first slider and the second slider. The first wheel acts on the first valve stem of the air circuit valve component, and the second wheel acts on the second valve stem of the air circuit valve component. When the handle disc is in the "normal position", the second slider extends and is locked in one slot. The first valve stem of the air circuit valve component is squeezed to open the ES split air circuit, and the second valve stem is not squeezed to close the ES combined air circuit. When the handle disc is in the "closed position", the first slider extends and is locked in the other slot. The first valve stem of the air circuit valve component is not squeezed to close the ES split air circuit, and the second valve stem is squeezed to open the ES combined air circuit.

4. The safety interlocking system as described in claim 3, characterized in that, The grounding unlocking interlock device further includes: an indicator light and a connector; The connector is connected to the indicator light and the button indicator switch. When the handle is in the "normal position", the indicator light is on and the button indicator switch is off; when the handle is in the "closed position", the indicator light is off and the button indicator switch is on.

5. The safety interlocking system as described in claim 1, characterized in that, The first baffle, the second baffle, and the third panel are arranged in parallel, with the first baffle positioned between the second baffle and the third panel. The first baffle and the second baffle are mounted on the third panel and can move left and right via support columns. The lock cylinder of the second lock B is linked to the first baffle via a fourth dial, and the lock cylinder of the third lock B is linked to the second baffle via a fourth dial.

6. The safety interlocking system as described in claim 5, characterized in that, The third panel is provided with two sets of circular holes, the first baffle is provided with two sets of circular holes, and the second baffle is provided with one set of elongated holes and one set of circular holes. When neither the second lock B nor the third lock B has a key inserted, the two sets of keyholes on the third panel, the first baffle, and the second baffle are not aligned. When the second key is inserted into the second lock B while the third key is not inserted into the third lock B, one set of lock holes on the third panel, the first baffle, and the second baffle are aligned, while the other set of lock holes are not aligned. When the second key is not inserted into the second lock B and the third key is inserted into the third lock B, the two sets of lock holes on the third panel, the first baffle and the second baffle are not aligned. When both the second lock B and the third lock B are inserted with keys, the two sets of lock holes on the third panel, the first baffle, and the second baffle are aligned.

Images