Safety interlocking alarm indication circuit

Abstract

The utility model discloses a safety interlocking alarm indicating circuit, which comprises a relay, a diode, a proximity switch SQ1, a proximity switch SQ2, a sound-light alarm lamp and a coil of the relay, the proximity switch SQ1 is connected with a normally closed contact of the proximity switch SQ2 in series, one end of the normally closed contact of the proximity switch SQ2 is connected with a static contact pin 5 of the relay, the diode is connected with the coil of the relay in parallel, and the sound-light alarm lamp is connected with the coil of the relay. One end of the sound-light alarm indicating lamp is connected with the positive electrode of a coil of the relay, the other end of the sound-light alarm indicating lamp is connected with a fourth pin of a movable contact of the relay, and the fourth pin of the movable contact, a fifth pin of a static contact and a third pin of the static contact of the relay K1 form a single-pole double-throw change-over switch K1B. The safety interlocking alarm indicating circuit solves the problem that when an output cable of the power supply is released and inserted into an airplane connecting interface for power supply in the using process of the unpowered dragging type airplane ground static variable power supply, an operator moves a trailer, and a cable pulling fault occurs due to the absence of the safety interlocking alarm indicating circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of trailer-type aircraft ground static power supply, in particular to a safety interlocking alarm indicating circuit. BACKGROUND

[0002] As is well known to those skilled in the art, the trailer-type aircraft ground static power supply provides power supply for civil or military aircraft ground maintenance and repair, and is generally used for remote power supply. When in use, the trailer-type aircraft ground static power supply is moved to a position close to the aircraft, the output cable is laid out, and the operator connects the aviation plug end of the output cable to the aircraft.

[0003] Due to the large size and heavy weight of the power supply, the power supply must be placed on the trailer. The trailer of the aircraft ground static power supply is mainly a non-powered towing type, which needs to be towed by an operator or a tractor. Since the use site of the aircraft ground static power supply is relatively noisy, the trailer does not have a safety interlocking indicating device. When the output cable of the power supply is inserted into the aircraft connection interface for power supply, the operator moves the trailer without a safety interlocking alarm indicating circuit, or the power supply of the safety interlocking alarm indicating circuit depends on the power supply of the mains, and the mains power interlocking alarm indication is invalid. Both of these two situations may cause the cable to be pulled and damaged, resulting in damage to the cable, plug and aircraft connector, and causing huge property losses to the airlines and airports. SUMMARY

[0004] The purpose of the present application is to provide a safety interlocking alarm indicating circuit that can effectively identify the state of the trailer and the state of the power supply output cable and handle it in a timely manner.

[0005] To achieve the above-mentioned purpose, the present application realizes the following technical solutions:

[0006] A safety interlocking alarm indicating circuit, comprising a relay K1, a diode V1, a proximity switch SQ1, a proximity switch SQ2 and an audible and visual alarm lamp H1.

[0007] The negative pole of the coil of the relay K1 is connected to one end of the normally closed contact of the proximity switch SQ1, the other end of the normally closed contact of the proximity switch SQ1 is connected to one end of the normally closed contact of the proximity switch SQ2, the negative pole of the diode V1 is connected to the positive pole of the coil of the relay K1, and the positive pole of the diode V1 is connected to the negative pole of the coil of the relay K1.

[0008] One end of the audible and visual alarm indicating lamp H1 is connected to the positive pole of the coil of the relay K1, the other end is connected to the moving contact 4 pin of the relay K1, one end of the normally closed contact of the proximity switch SQ2 is connected to the static contact 5 pin of the relay K1, and the moving contact 4 pin, the static contact 5 pin and the static contact 3 pin of the relay K1 form a single-pole double-throw switch K1B.

[0009] Preferably, the safety interlock alarm indication circuit further comprises an input interface X1, a transformer T1, a charger U1 and a storage battery D1;

[0010] The input interface X1 is connected with the mains, the input end of the transformer T1 is connected with the input interface X1, the output end of the transformer T1 is connected with the input end of the charger U1, and the output end of the charger U1 is connected with the storage battery D1.

[0011] The positive pole of the storage battery D1 is electrically connected with the positive pole of the coil of the relay K1, the negative pole of the storage battery D1 is electrically connected with the other end of the normally closed contact of the proximity switch SQ2, the positive pole of the storage battery D1 is connected with the positive pole of the audible and light alarm indication lamp H1, the negative pole of the storage battery D1 is connected with the moving contact 4 pin of the relay K1, and the static contact 5 pin of the relay K1 is connected with the negative pole of the storage battery D1.

[0012] Preferably, the 1 pin of the input interface X1 is connected with the mains live wire L1, the 2 pin of the input interface X1 is connected with the mains live wire L2, and the 3 pin of the input interface X1 is connected with the ground.

[0013] The 1 pin of the input end of the transformer is connected with the 1 pin of the input interface X1, the 2 pin of the input end of the transformer is connected with the 2 pin of the input interface X1, the 3 pin of the output end of the transformer is connected with the positive pole N pin of the charger U1, the 4 pin of the output end of the transformer is connected with the negative pole L pin of the charger U1, and the PE pin of the charger U1 is electrically connected with the 3 pin of the input interface X1.

[0014] The output pin V+ of the charger is connected with the positive pole of the storage battery D1, and the output pin V- of the charger is connected with the negative pole of the storage battery D1.

[0015] Preferably, the safety interlock alarm indication circuit further comprises an output interface X2 and a power supply control module M1.

[0016] The 8 pin of the static contact of the relay K1 is connected with the 3 pin of the output interface X2, the 9 pin of the moving contact of the relay K1 is connected with the 1 pin of the output interface X2, the 10 pin of the static contact of the relay K1 is connected with the 2 pin of the output interface X2, and the 9 pin of the moving contact, the 8 pin of the static contact and the 10 pin of the static contact of the relay K1 form a single-pole double-throw change-over switch K1C.

[0017] The 1 pin of the output interface X2 is connected with the COM pin of the power supply control module M1, the 2 pin of the output interface X2 is connected with the NC pin of the power supply control module M1, and the 3 pin of the output interface X2 is connected with the NO pin of the power supply control module M1.

[0018] Preferably, the transformer T1 is a step-down transformer, and the transformation ratio is 380:220.

[0019] Preferably, the charger U1 is a wide-range output small-sized charger, the model is NPB-120, and the equalizing voltage is 14.4V, 28.8V or 57.6V.

[0020] Preferably, the proximity switches SQ1 and SQ2 are model XCMH2121L1, and the normally closed contacts of SQ1 and SQ2 are connected in series in the circuit.

[0021] Preferably, the relay K1 is model 793-P-1C-S, and the relay coil voltage is 12VDC, 24VDC or 48VDC, and the relay has two sets of normally open and normally closed contacts.

[0022] Preferably, the audible and visual alarm lamp is model AL809U, and the working voltage is 12VDC, 24VDC or 48VDC.

[0023] Preferably, the proximity switch SQ1 is a state switch for the towing bar position of the unpowered towed aircraft, and the closed state of SQ1 indicates that the towing bar is in the towing position and the towed aircraft is in the towing state; and the proximity switch SQ2 is a state switch for the position of the output cable plug, and the closed state of SQ2 indicates that the output cable of the power supply is pulled out and the power supply is inserted into the aircraft power supply state.

[0024] The advantage of the present application is that the battery D1 is powered, and during the use of the unpowered towed aircraft ground static power supply, the input interface X1 has a commercial power supply of 380V / 50Hz, which is reduced to 220V / 50Hz by the transformer T1 to supply power to the charger U1, the charger U1 charges the battery D1, and the battery D1 stores energy, solving the problem of failure of the safety interlocking indication circuit under the condition of commercial power failure.

[0025] The proximity switch SQ1 in the circuit is a state switch for the towing bar position of the unpowered towed aircraft, and the closed state of SQ1 indicates that the towing bar is in the towing position and the towed aircraft is in the towing state; and the proximity switch SQ2 is a state switch for the position of the output cable plug, and the closed state of SQ2 indicates that the output cable of the power supply is pulled out and the power supply is inserted into the aircraft power supply state; the normally closed contacts of the proximity switches SQ1 and SQ2 are connected in series, and when the towing bar is in the towing position, the towed aircraft is in the towing state, and the output cable of the power supply is pulled out and the power supply is inserted into the aircraft power supply state, the audible and visual alarm lamp H1 sends out an audible and visual alarm to prompt the operator that the unpowered towed aircraft ground static power supply is being used and that towing is prohibited; at the same time, the dry contact signal of the output interface X2 is transmitted to the power supply control module M1, and the power supply actively cuts off the power supply output to prevent accidents. The circuit solves the problem that during the use of the unpowered towed aircraft ground static power supply, when the output cable of the power supply is pulled out and inserted into the aircraft connection interface for power supply use, the operator moves the towed aircraft, there is no safety interlocking alarm indication circuit, and the cable, plug and aircraft connector are damaged due to the pulling of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The safety interlocking alarm indication circuit of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings of the embodiments of the present application.

[0028] Embodiment 1

[0029] The present embodiment discloses a safety interlocking alarm indicating circuit, please refer to Figure 1 , comprising an input interface X1, a transformer T1, a charger U1, a storage battery D1, a relay K1, a diode V1, a proximity switch SQ1, a proximity switch SQ2, an audible and visual alarm lamp H1, an output interface X2, and a power control module M1.

[0030] The 1st pin of the input interface X1 is connected to the live wire L1 of the mains, the 2nd pin of the input interface X1 is connected to the live wire L2 of the mains, and the 3rd pin of the input interface X1 is connected to the ground. The 1st pin of the transformer input end is connected to the 1st pin of the input interface X1, the 2nd pin of the transformer input end is connected to the 2nd pin of the input interface X1, the 3rd pin of the transformer output end is connected to the positive electrode N pin of the charger U1, the 4th pin of the transformer output end is connected to the negative electrode L pin of the charger U1, and the PE pin of the charger U1 is electrically connected to the 3rd pin of the input interface X1. The charger output pin V+ is connected to the positive electrode of the storage battery D1, and the charger output pin V- is connected to the negative electrode of the storage battery D1.

[0031] The positive electrode of the coil of the relay K1 is electrically connected to the positive electrode of the storage battery D1, the other end of the normally closed contact of the proximity switch SQ2 is electrically connected to the negative electrode of the storage battery D1, the positive electrode of the audible and visual alarm indicating lamp H1 is connected to the positive electrode of the storage battery D1, the negative electrode of the audible and visual alarm indicating lamp H1 is connected to the movable contact 4 pin of the relay K1, and the static contact 5 pin of the relay K1 is connected to the negative electrode of the storage battery D1.

[0032] The negative electrode of the coil of the relay K1 is connected to one end of the normally closed contact of the proximity switch SQ1, the other end of the normally closed contact of the proximity switch SQ1 is connected to one end of the normally closed contact of the proximity switch SQ2, the negative electrode of the diode V1 is connected to the positive electrode of the coil of the relay K1, and the positive electrode of the diode V1 is connected to the negative electrode of the coil of the relay K1; one end of the audible and visual alarm indicating lamp H1 is connected to the positive electrode of the coil of the relay K1, the other end of the audible and visual alarm indicating lamp H1 is connected to the movable contact 4 pin of the relay K1, one end of the normally closed contact of the proximity switch SQ2 is connected to the static contact 5 pin of the relay K1, and the movable contact 4 pin, the static contact 5 pin and the static contact 3 pin of the relay K1 constitute a single-blade double-throw switch K1B.

[0033] The 8th pin of the static contact of the relay K1 is connected to the 3rd pin of the output interface X2, the 9th pin of the movable contact of the relay K1 is connected to the 1st pin of the output interface X2, the 10th pin of the static contact of the relay K1 is connected to the 2nd pin of the output interface X2, and the movable contact 9 pin, the static contact 8 pin and the static contact 10 pin of the relay K1 constitute a single-blade double-throw switch K1C;

[0034] Pin 1 of output interface X2 is connected to the COM pin of power control module M1, pin 2 of output interface X2 is connected to the NC pin of power control module M1, and pin 3 of output interface X2 is connected to the NO pin of power control module M1.

[0035] Example 2

[0036] In this embodiment, the circuit described in Example 1 is used, and transformer T1 is a step-down transformer with a turns ratio of 380:220.

[0037] The safety interlock alarm indicator circuit is powered by battery D1. During the use of the ground static power supply for the unpowered towed aircraft, the input interface X1 receives 380V / 50Hz AC mains power, which is stepped down to 220V / 50Hz by transformer T1 to power charger U1. Charger U1 charges battery D1, and battery D1 stores energy. Whether AC mains power is available or not, battery D1 can provide energy for relay K1 and audible and visual alarm light H1 of the safety interlock alarm indicator circuit, solving the problem of the safety interlock indicator circuit failing when AC mains power is lost.

[0038] In the safety interlock alarm indication circuit, proximity switch SQ1 is the status switch for the tow bar position of the unpowered trailer. When SQ1 is closed, it indicates that the tow bar is in the towing position and the trailer is being towed. Proximity switch SQ2 is the status switch for the output cable plug position. When SQ2 is closed, it indicates that the power output cable is pulled out and the power is plugged into the aircraft. The normally closed contacts of proximity switches SQ1 and SQ2 are connected in series. When the tow bar is in the towing position, the trailer is being towed, and the power output cable is pulled out and the power is plugged into the aircraft, the audible and visual alarm light H1 emits an audible and visual alarm, reminding the operator that the unpowered towed aircraft ground static transformer is in use and towing is prohibited. At the same time, the dry contact signal of the output interface X2 is transmitted to the power control module M1, and the power supply actively cuts off the power output to prevent cable pulling accidents.

[0039] When SQ1 is in the off state, the tow bar is in the upright state, the trailer is in the non-towing state, the audible and visual alarm light H1 will not emit an audible and visual alarm because there is no power supply circuit, and the ground static transformer power supply of the towed aircraft can work normally to supply power.

[0040] When SQ2 is in the off state, the indicator output cable plug is in the retracted state, the power supply is not plugged into the aircraft power supply, the audible and visual alarm light H1 will not emit an audible and visual alarm because there is no power supply circuit, and the towed aircraft ground static power supply can be used for towing.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A safety interlock alarm indication circuit, characterized by, It includes relay K1, diode V1, proximity switch SQ1, proximity switch SQ2 and audible and visual alarm lamp H1; The negative pole of the coil of the relay K1 is connected to one end of the normally closed contact of the proximity switch SQ1, the other end of the normally closed contact of the proximity switch SQ1 is connected to one end of the normally closed contact of the proximity switch SQ2, the negative pole of the diode V1 is connected to the positive pole of the coil of the relay K1, and the positive pole of the diode V1 is connected to the negative pole of the coil of the relay K1; One end of the audible and visual alarm indicator lamp H1 is connected to the positive pole of the coil of the relay K1, the other end is connected to the moving contact 4 pin of the relay K1, one end of the normally closed contact of the proximity switch SQ2 is connected to the static contact 5 pin of the relay K1, and the moving contact 4 pin, the static contact 5 pin and the static contact 3 pin of the relay K1 form a single-pole double-throw switch K1B.

2. The safety interlock alarm indicator circuit of claim 1, wherein, It also includes an input interface X1, a transformer T1, a charger U1 and a storage battery D1. The input interface X1 is connected to the mains, the input end of the transformer T1 is connected to the input interface X1, the output end of the transformer T1 is connected to the input end of the charger U1, and the output end of the charger U1 is connected to the storage battery D1. The positive pole of the coil of the relay K1 is electrically connected to the positive pole of the storage battery D1, the other end of the normally closed contact of the proximity switch SQ2 is electrically connected to the negative pole of the storage battery D1, the positive pole of the audible and visual alarm indicator lamp H1 is connected to the positive pole of the storage battery D1, the negative pole of the audible and visual alarm indicator lamp H1 is connected to the moving contact 4 pin of the relay K1, and the static contact 5 pin of the relay K1 is connected to the negative pole of the storage battery D1.

3. The safety interlock alarm indicator circuit of claim 2, wherein, Pin 1 of the input interface X1 is connected to the mains live wire L1, pin 2 of the input interface X1 is connected to the mains live wire L2, and pin 3 of the input interface X1 is connected to the ground. Pin 1 of the transformer input end is connected to pin 1 of the input interface X1, pin 2 of the transformer input end is connected to pin 2 of the input interface X1, pin 3 of the transformer output end is connected to the positive pole N pin of the charger U1, pin 4 of the transformer output end is connected to the negative pole L pin of the charger U1, and the PE pin of the charger U1 is electrically connected to pin 3 of the input interface X1. The V+ output pin of the charger is connected to the positive pole of the storage battery D1, and the V- output pin of the charger is connected to the negative pole of the storage battery D1.

4. The safety interlock alarm indicator circuit of claim 1, wherein, It also includes an output interface X2 and a power control module M1. Pin 8 of the static contact of the relay K1 is connected to pin 3 of the output interface X2, pin 9 of the moving contact of the relay K1 is connected to pin 1 of the output interface X2, pin 10 of the static contact of the relay K1 is connected to pin 2 of the output interface X2, and pin 9 of the moving contact, pin 8 of the static contact and pin 10 of the static contact of the relay K1 form a single-pole double-throw switch K1C. Pin 1 of the output interface X2 is connected to the COM pin of the power control module M1, pin 2 of the output interface X2 is connected to the NC pin of the power control module M1, and pin 3 of the output interface X2 is connected to the NO pin of the power control module M1.

5. The safety interlock alarm indicator circuit of claim 2, wherein, The transformer T1 is a step-down transformer with a transformation ratio of 380:

220.

6. The safety interlock alarm indicator circuit of claim 2, wherein, The charger U1 is a wide-range output small charger with a model number of NPB-120, and the uniform charging voltage is 14.4V, 28.8V or 57.6V.

7. The safety interlock alarm indicator circuit of claim 1, wherein, The proximity switches SQ1 and SQ2 have a model number of XCMH2121L1, and a set of normally closed contacts of SQ1 and SQ2 are connected in series in the circuit.

8. The safety interlock alarm indicator circuit of claim 1, wherein, The relay K1 is of type 793-P-1C-S, with a relay coil voltage of 12VDC, 24VDC or 48VDC, and has two sets of normally open and normally closed contacts.

9. The safety interlock alarm indicator circuit of claim 1, wherein, The sound and light alarm lamp is of type AL809U, with a working voltage of 12VDC, 24VDC or 48VDC.

10. The safety interlock alarm indicator circuit of claim 1, wherein, The proximity switch SQ1 is a state switch for the position of the towing hitch of the unpowered trailer, and the closed state of SQ1 indicates that the towing hitch is in the towing position and the trailer is in the towing state; the proximity switch SQ2 is a state switch for the position of the output cable plug, and the closed state of SQ2 indicates that the output cable of the power supply is pulled out and the power supply is inserted into the aircraft power supply state.

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