Multifunctional relay detection device

Abstract

The utility model discloses a multifunctional relay detection device which comprises a single-chip microcomputer control circuit, a relay socket, a rectification circuit, a power supply circuit, an indicating lamp circuit, a lithium battery power supply circuit, a button control circuit, an oxide layer removing circuit and a basic function test circuit. The lithium battery power supply circuit is connected with the single-chip microcomputer control circuit, the single-chip microcomputer control circuit is respectively connected with and responsible for intelligently controlling the relay socket, the indicating lamp circuit, the oxide layer clearing circuit and the basic function test circuit, one end of the key control circuit is connected with an IO port of a single-chip microcomputer, and the other end of the key control circuit is connected with GND. The device has the advantages of effectively solving the problem of relay oxidation, prolonging the service life of the relay, greatly improving the operation stability of rail transit equipment, being easy to operate, convenient to carry, beneficial to large-scale popularization, and capable of achieving on-off detection of relays of multiple specifications and voltage classes, and achieving multiple purposes.

Description

Technical Field

[0001] The utility model relates to the fields of electric power and rail transit, and particularly relates to a multifunctional relay detection device. Background Art

[0002] In the existing rail transit power supply system, as an important automatic control component, the contacts of the relay are vulnerable to oxide pollution after long-term high-intensity use, resulting in an increase in contact resistance, which in turn affects the normal operation and electrical performance of the relay. This problem will not only reduce the service life of the relay, but also may cause misoperation or refusal to operate, thus posing a potential threat to the stability and safety of the power supply system.

[0003] In the actual operation link of substation production, the current detection means and technologies have obvious deficiencies, mainly manifested as the lack of a special device or system that can efficiently and accurately detect relays of multiple voltage levels. At present, the detection of relays mostly relies on traditional manual operations and single detection instruments. This situation leads to low detection work efficiency, making it difficult to meet the needs of large-scale and high-density maintenance work, and at the same time restricting the improvement of the ability of technicians to quickly and accurately judge the state of the relay. Content of the Utility Model

[0004] In order to overcome the problems such as the easy oxidation of the contacts of traditional relays after long-term use, the lack of a detection device for relays of multiple voltage levels, and the low detection efficiency, the utility model proposes a multifunctional relay detection device.

[0005] The technical solution adopted by the utility model to achieve the above purpose is: it includes a single-chip microcomputer control circuit, a relay socket, a rectification circuit, a power supply circuit, an indicator light circuit, a lithium battery power supply circuit, a key control circuit, an oxide layer removal circuit, and a basic function test circuit. The power supply circuit is sequentially connected to the rectification circuit and the single-chip microcomputer control circuit. The lithium battery power supply circuit is connected to the single-chip microcomputer control circuit. The single-chip microcomputer control circuit is respectively connected to and responsible for intelligently controlling the relay socket, the indicator light circuit, the oxide layer removal circuit, and the basic function test circuit. One end of the key control circuit is connected to the IO port of the single-chip microcomputer control circuit, and the other end is connected to GND to realize the human-computer interaction function.

[0006] This device is directly powered by a power supply circuit with two power supply methods: internal 12V battery power supply and external 220V AC power supply. The voltage is converted to DC220V and DC24V through the rectification circuit to provide a stable power supply for the entire device.

[0007] This device also provides a lithium battery power supply circuit and uses a boat-shaped switch to achieve flexible switching between AC and DC power supply methods.

[0008] The basic function test circuit is responsible for controlling the relay to pull in and conducting the relay pull-in test; at the same time, it reads the states of the normally open and normally closed points of the relay through the IO, detects the contact resistance of the contacts, and conducts the normally open and normally closed point tests.

[0009] The beneficial effects of the present utility model are as follows:

[0010] 1. It can effectively solve the problem of relay oxidation, effectively remove the oxide layer on the relay contacts, remove the oxides on the moving and static contacts of the relay, extend the service life of the relay, and greatly improve the operation stability of rail transit equipment;

[0011] 2. It is simple to operate and easy to carry, which is conducive to large-scale promotion.

[0012] 3. It realizes the on-off detection of relays with multiple voltage levels and specifications, and can be used for multiple purposes. The device can test ten specifications of relays, including DC24V, DC220V, AC220V three voltage levels and COMATRELECO DC24V 14-pin, 8-pin small relays, COMATREIECO DC220V 14-pin and 8-pin small relays, DC24V 14-pin and 8-pin small relays, DC220V 14-pin and 8-pin small relays, AC220V 14-pin and 8-pin small relays, covering the common relay types in the subway power supply system. The device has three functions: coil pull-in test, normally open and normally closed point test, and contact oxide film cleaning. Description of the Drawings

[0013] Figure 1 It is a structural block diagram of a multifunctional relay detection device;

[0014] Figure 2 It is a control block diagram of a multifunctional relay detection device; Detailed Embodiment

[0015] As Figure 1-2 shown, a multifunctional relay detection device of the present utility model includes a single-chip microcomputer control circuit, a relay socket, a rectification circuit, a power supply circuit, an indicator light circuit, a lithium battery power supply circuit, a key control circuit, an oxide layer removal circuit, and a basic function test circuit. The power supply circuit is sequentially connected to the rectification circuit and the single-chip microcomputer control circuit. The lithium battery power supply circuit is connected to the single-chip microcomputer control circuit. The single-chip microcomputer control circuit is respectively connected to and responsible for intelligently controlling the relay socket, the indicator light circuit, the oxide layer removal circuit, and the basic function test circuit. One end of the key control circuit is connected to the IO port of the single-chip microcomputer control circuit, and the other end is connected to the GND to realize the human-computer interaction function.

[0016] This device is directly powered by a power supply circuit with two methods: internal 12V battery power supply and external 220V AC power supply. The voltage is converted to DC220V and DC24V through a rectifier circuit to provide stable power for the entire device.

[0017] This device also provides a lithium battery power supply circuit and uses a ship-shaped switch to achieve flexible switching between AC and DC power supply methods.

[0018] The basic function test circuit is responsible for controlling the relay to close and conducting the relay closing test; at the same time, it reads the status of the normally open and normally closed points of the relay through the IO, detects the contact resistance of the contact, and conducts the normally open / closed point test.

[0019] ① Single-chip microcomputer control circuit: Composed of an stc52 single-chip microcomputer and peripheral control circuits, it is responsible for the control and protection of the entire system. It contains a temperature sensor and voltage and current detection sensors to achieve functions such as over-temperature protection, over-current protection, and short-circuit protection; system control is triggered by buttons. Press the test button to activate the relay on-off test function; press the grinding function, and the single-chip microcomputer controls the relay to enter the grinding mode, with a default output of 1HZ pulse, and the output pulse frequency is adjustable from 1 - 1000HZ, thereby controlling the relay to open and close to achieve the contact grinding function.

[0020] ② Relay socket: It integrates multi-specification sockets of relays commonly used in the subway, with two relay sockets of each voltage level of AC220V, DC220V, and DC24V built-in.

[0021] ③ Rectifier circuit: Composed of a bridge rectifier, it is responsible for completing the AC-DC conversion and converting AC220V alternating current into direct current.

[0022] ④ Power supply circuit: It has two methods of internal 12V battery power supply and external 220V AC power supply. The external 220V power supply outputs DC12V through an AC220V to DC12V step-down circuit to provide power for the boost circuit, and then through a DC12V to DC220V boost circuit and a DC12V to DC24V boost circuit to provide AC220V, DC220V, and DC24V power for the device; the internal 12V battery power supply and external 220V AC power supply methods are switched through a 2-way 3-position switch. At the same time, when the external 220V AC power supply is used, the internal 12V battery can also be charged; the internal 12V battery power supply part includes: a 12V lithium battery pack, a 12V lithium battery power supply circuit, a 12V lithium battery charging device, etc.

[0023] ⑤ Indicator light circuit: Used to indicate the on-off state of the relay. It shows red when the relay is closed and green when the relay is open.

[0024] ⑥ Lithium battery power supply circuit: It consists of a lithium battery charging circuit and a lithium battery protection circuit. The lithium battery charging circuit integrates a lithium battery charging interface to achieve the lithium battery charging function, and the lithium battery protection circuit realizes overcurrent protection and short-circuit protection of the lithium battery; the lithium battery power supply circuit is responsible for the backup power supply of the system. When the AC power is cut off, the system can be powered by the lithium battery to ensure the normal operation of the system.

[0025] ⑦ Button control circuit: It is the bridge of human-computer interaction and consists of several switch buttons to convey human control commands to the single-chip microcomputer.

[0026] ⑧ Oxide layer removal circuit: A resistor with 230Vac and a power consumption of 2.7VA is used as the load for the normally open contact whose oxide film needs to be removed. Its working current is 14.7mA. Tests have proven that it can relatively well remove the oxide film on the contact without generating black spots on the contact. After opening and closing several times, the oxide film on the problematic contact will be removed, achieving the function of removing the contact oxide layer.

[0027] ⑨ Basic function test circuit: The single-chip microcomputer outputs high and low level signals through the IO port to control whether the relay coil is energized, and then controls the relay to close for the relay closing test; at the same time, the status of the normally open / closed points of the relay is read through the IO to detect the contact resistance of the contact for the normally open and closed point tests.

Claims

1. A multifunctional relay detection device, characterized in that: It includes a single-chip microcomputer control circuit, a relay socket, a rectification circuit, a power supply circuit, an indicator light circuit, a lithium battery power supply circuit, a key control circuit, an oxide layer removal circuit, and a basic function test circuit. The power supply circuit is sequentially connected to the rectification circuit and the single-chip microcomputer control circuit. The lithium battery power supply circuit is connected to the single-chip microcomputer control circuit. The single-chip microcomputer control circuit is respectively connected to and responsible for intelligently controlling the relay socket, the indicator light circuit, the oxide layer removal circuit, and the basic function test circuit. One end of the key control circuit is connected to the IO port of the single-chip microcomputer control circuit, and the other end is connected to GND.

2. The multifunctional relay detection device according to claim 1, wherein: The power supply circuit includes two power supply methods: internal 12V battery power supply and external 220V AC power supply, and the voltage is converted to DC220V and DC24V through the rectification circuit.

3. The multifunctional relay detection device according to claim 1, characterized in that: The lithium battery power supply circuit uses a boat-shaped switch to achieve flexible switching between AC and DC power supply methods.

4. The multifunctional relay detection device according to claim 1, characterized in that: The basic function test circuit is responsible for controlling the relay to close and performing the relay closing test; at the same time, it reads the status of the normally open / normally closed points of the relay through the IO, detects the contact resistance value of the contact, and performs the normally open / normally closed point test.

5. The multifunctional relay detection device according to claim 2, wherein: When the power supply circuit is externally connected to 220V AC power supply, it can also charge the internal 12V battery.

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