Contact electric cleaning control system and cleaning method

Abstract

The present invention discloses a contact electric cleaning control system and a cleaning method. The control system realizes efficient cleaning of relay contacts through a power supply circuit, a terminal block and a contact electric cleaning control circuit. The power supply circuit converts 220V AC into 24V, 48V and 110V DC power supplies, adapts the working voltage of different relays through a conversion switch, and adopts a self-locking design combined with a time relay to realize periodic switching, generating electric sparks to break down contact oxides; the cleaning method includes installing a relay, selecting a voltage, connecting a load resistor in series, starting cleaning, and retesting the contact resistance of the cleaned relay to determine whether the cleaning is qualified. Through the above-mentioned method, the present invention has high versatility and expansibility, stable and efficient cleaning, adapts to a variety of relay models, and can be externally connected to an alligator clip to clean the contacts of a small circuit breaker, flexibly adjusts the electrical breakdown frequency through a time relay, and efficiently removes contact oxides, with a qualified rate of over 95%, reducing replacement costs.

Description

Technical Field

[0001] The present invention relates to the technical field of relay cleaning, and in particular to a contact electrical cleaning control system and a cleaning method. Background Art

[0002] Relays and low-current contactors are widely used as control components of auxiliary circuits in rail transit vehicles such as high-speed trains, motor vehicles, and subways. The body design life of these vehicles is up to 30 years. To ensure their stable operation, relays and contactors need to be tested for performance at two key mileage points: 4.8 million kilometers (approximately corresponding to an 8-10 year service life) and 7.2 million kilometers (approximately corresponding to a 12-15 year service life).

[0003] The contact test standards for relays and contactors require that the contact resistance be maintained at ≤300 mΩ. However, with long-term use, the contact resistance may gradually increase due to factors such as wear and oxidation, resulting in a significant increase in the heat generated by the relay during subsequent use, which in turn increases the risk of damage or even burning of the relay due to overheating. Relays that cannot meet this performance requirement must be replaced.

[0004] It is worth noting that the qualified rate of contact resistance of relay contacts that have not been electrically cleaned is less than 45%. This poses a severe challenge in practical applications. Since relays are used in large quantities and most of them are imported brands with high prices, their replacement costs are high. Therefore, how to effectively repair the contact resistance without replacing the relay to ensure that the relay can continue to meet the use requirements has become a key issue that needs to be solved urgently. Summary of the invention

[0005] The main technical problem solved by the present invention is to provide a contact electric cleaning control system and cleaning method, which are highly versatile and expansible, can clean stably and efficiently, can be adapted to a variety of relay models, and can use external alligator clips to clean the contacts of small circuit breakers. The electrical breakdown frequency can be flexibly adjusted through a time relay, and contact oxides can be efficiently removed. The qualified rate exceeds 95%, thereby reducing replacement costs.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a contact electric cleaning control system, including: a power supply circuit, a terminal block and a contact electric cleaning control circuit: the power supply circuit includes: a power supply, a circuit breaker Q1, an emergency stop button SA7, a power module JK1, a power module JK2, a power module JK3 and a conversion switch SA2, the live wire L and the neutral wire N of the power supply are connected to the input end of the circuit breaker Q1, the output end of the circuit breaker Q1 is connected to the emergency stop button SA7 and then connected to the input ends of the power module JK1, the power module JK2 and the power module JK3 respectively, the output ends of the power modules JK1, JK2 and JK3 are respectively connected to the 1 / 2 pin, the 3 / 4 pin and the 7 / 8 pin of the terminal block to provide a working voltage for the contact cleaning control circuit, and the power converted by the power modules JK1, JK2 and JK3 is connected to the conversion switch SA2 through the terminal block;

[0007] The contact electric cleaning control circuit includes: a start button SB1, a stop button SB2, an intermediate relay KA5, an intermediate relay KA6, a time relay KT, a cleaned relay KA1, a cleaned relay KA2, a cleaned relay KA3, a cleaned relay KA4, a resistor R1, a resistor R2 and a resistor R3; the output end of the power module JK2 is sequentially connected in series with the normally open point of the start button SB1, the normally closed point of the stop button SB2 and the normally closed point of the time relay KT, and then connected to one end of the coil of the intermediate relays KA5 and KA6; one end of the coil of the time relay KT is connected to the middle point of the series connection of the normally closed point of the stop button SB2 and the normally closed point of the time relay KT; the other ends of the coils of the intermediate relays KA5, KA6 and the time relay KT are connected to the neutral line N of the power supply;

[0008] After the intermediate relays KA5 and KA6 are energized and self-locked, their respective second normally open contacts KA5-2 and KA6-2 are closed to energize the coils of the cleaned relays KA1 and KA2, and the coils of the cleaned relays KA3 and KA4, respectively; the auxiliary contacts of the cleaned relays KA1, KA2, KA3 and KA4 are respectively connected in parallel to pins 7, 10, 11 and 12 of the terminal row; the X1 pins of the resistors R1, R2 and R3 are respectively connected to pins 10 / 11 / 12 of the terminal row, and the X2 pins of the resistors R1, R2 and R3 are connected in parallel to pin 9 of the terminal row.

[0009] In a preferred embodiment of the present invention, the power supply is 220V AC, the power module JK1 converts the 220V power supply into a 24V DC power supply for power supply, the power module JK2 converts the 220V power supply into a 110V DC power supply for power supply, the power module JK3 converts the 220V power supply into a 48V DC power supply for power supply, and the circuit breaker Q1 is used for on-off control of the 220V access power supply of the power module JK1, the power module JK2 and the power module JK3.

[0010] In a preferred embodiment of the present invention, the two ends of the normally open point of the start button SB1 are connected in parallel to the first normally open contact KA5-1 of the intermediate relay KA5, the first normally open contact KA6-1 of the intermediate relay KA6 and the normally open point of the time relay KT to form a self-locking circuit, and the power module JK2 is configured to provide a working voltage to the self-locking circuit, and the self-locking circuit realizes a continuous power-on state of the circuit through the auxiliary contacts of the intermediate relays KA5 and KA6.

[0011] In a preferred embodiment of the present invention, pin No. 17 of the terminal row is respectively connected to the second normally open contact KA5-2 of the intermediate relay KA5 and the second normally open contact KA6-2 of the intermediate relay KA6, the second normally open contact KA5-2 of the intermediate relay KA5 is also connected in parallel to one end of the coils of the cleaned relays KA1 and KA2, the second normally open contact KA6-2 of the intermediate relay KA6 is also connected in parallel to one end of the coils of the cleaned relays KA3 and KA4, and the other ends of the coils of the cleaned relays KA1, KA2, KA3 and KA4 are connected in parallel to pin No. 16 of the terminal row.

[0012] In a preferred embodiment of the present invention, the circuit on-off time of the time relay KT is set to 0.1-1S.

[0013] In a preferred embodiment of the present invention, pins 1 / 2, 3 / 4, and 7 / 8 of the terminal block are respectively connected to input connection points 7 / 11, 3 / 5, and 1 / 9 of the conversion switch SA2, the output connection points 2 / 4 / 8 of the conversion switch SA2 are short-circuited by a ring line and connected to pin 17 of the terminal block, and the output connection points 6 / 10 / 12 of the conversion switch SA2 are short-circuited by a ring line and connected to pin 16 of the terminal block.

[0014] In a preferred embodiment of the present invention, the auxiliary contacts 2 / 4 / 6 of the cleaned relay KA1, the auxiliary contacts 5 / 6 / 7 of the cleaned relay KA2, the auxiliary contacts 5 / 6 / 7 of the cleaned relay KA3 and the auxiliary contacts 5 / 6 / 7 of the cleaned relay KA4 are connected in parallel and connected to pin 7 of the terminal row; the auxiliary contacts 3 of the cleaned relay KA1, the auxiliary contacts 3 of the cleaned relay KA2, the auxiliary contacts 4 of the cleaned relay KA3 and the auxiliary contacts 3 of the cleaned relay KA4 are connected in parallel. After that, pin No. 10 of the terminal row is connected; the auxiliary contact 7 of the cleaned relay KA1, the auxiliary contact 2 of the cleaned relay KA2, the auxiliary contact 9 of the cleaned relay KA3 and the auxiliary contact 2 of the cleaned relay KA4 are connected in parallel and then connected to pin No. 11 of the terminal row; the auxiliary contact 5 of the cleaned relay KA1, the auxiliary contact 10 of the cleaned relay KA2, the auxiliary contact 8 of the cleaned relay KA3 and the auxiliary contact 10 of the cleaned relay KA4 are connected in parallel and then connected to pin No. 12 of the terminal row.

[0015] In a preferred embodiment of the present invention, pins 8 and 9 of the terminal row are connected with a shorting wire, pins 10 and 20 of the terminal row are connected with a shorting wire, and pins 11 and 18 of the terminal row are connected with a shorting wire.

[0016] In a preferred embodiment of the present invention, the contact cleaning control circuit may also include a circuit breaker Q2 and a contactor KM1, the incoming line point of the circuit breaker Q2 is connected to pin No. 7 of the terminal row, the outgoing line point of the circuit breaker Q2 is respectively connected to the contact clamps KM1-2 and KM1-4 of the contactor KM1, pins No. 18 / 20 of the terminal row are respectively connected to the contact clamps KM1-1 and KM1-3 of the contactor KM1, pin No. 16 of the terminal row is connected to the negative pole KM1-A2 of the external coil clamp of the contactor KM1, the auxiliary contact 1 of the cleaned relay KA1 is connected to the positive pole KM1-A1 of the external coil clamp of the contactor KM1, and the positive pole KM1-A1 of the external coil clamp is also connected to the second normally open contact KA5-2 of the intermediate relay KA5.

[0017] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a cleaning method for a contact electric cleaning control system, comprising the following steps:

[0018] S1. Install the coils of the cleaned relays KA1, KA2, KA3, and KA4 on the corresponding relay bases respectively. KA1 and KA2 are used to break down the normally open contacts, and KA3 and KA4 are used to break down the normally closed contacts. The corresponding relay base can be selected according to the status of different relay contacts;

[0019] S2, input 220V power through circuit breaker Q1, 220V power is converted into 24V DC power, 48V DC power and 110V DC power through power modules JK1, JK2 and JK3 respectively, to provide working voltage, the converted DC power is connected to the conversion switch SA2, according to the working voltage of the cleaned relay, the conversion switch SA2 is toggled to the corresponding gear;

[0020] S3, connect resistors R1, R2, and R3 in series to the contact circuit of the relay base to be cleaned, as the load during electrical cleaning;

[0021] S4, combine the start button SB1, the stop button SB2, the intermediate relays KA5, KA6 and the time relay KT into a self-locking circuit, and adjust the circuit on-off time of the time relay to 0.2S;

[0022] S5. Press the start button SB1. After the intermediate relays KA5 and KA6 are powered on and self-locked, their auxiliary contacts KA5-2 and KA6-2 energize the coils of the cleaned relays KA1, KA2, KA3, and KA4, respectively, to start electrical cleaning.

[0023] S6. The contacts of the cleaned relay are continuously switched on and off with a cycle of 0.2S, and the process lasts for about 30S. During the cleaning process, resistors R1, R2, and R3 ensure the stability of the current, so as to achieve electrical breakdown and cleaning of the contacts.

[0024] S7, 10-30S later, press the stop button SB2 to cut off the control system, the intermediate relays KA5 and KA6 are released, and the cleaning is completed;

[0025] S8. Re-test the contact resistance of the cleaned relay after electrical cleaning: if the contact resistance value meets ≤300mΩ, the cleaning is passed and the relay can be used normally; if the contact resistance value is greater than 300mΩ, repeat the above cleaning operation until the contact resistance value meets the requirements.

[0026] The beneficial effects of the present invention are:

[0027] By designing a cleaning device with contact cleaning function and a cleaning control circuit to continuously energize the relay, the relay contacts will continuously generate sparks under load. During the generation process, the sparks will continuously break through the oxides on the contact surface, thereby achieving the effect of electrically cleaning the relay contacts. The cleaning is stable and efficient, with a pass rate of over 95%, reducing replacement costs;

[0028] It can adapt to various types of relays to meet the cleaning needs of different equipment, can be configured with multiple power supplies to clean relays of different voltage levels, and can temporarily clean the contacts of small circuit breakers or other types of relays through external small alligator clips, enhancing versatility and expandability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0030] Figure 1 It is a control principle diagram of the contact electric cleaning control system of the present invention;

[0031] Figure 2 yes Figure 1 A magnified view of middle;

[0032] Figure 3 yes Figure 1 Enlarged view of middle B;

[0033] Figure 4 yes Figure 1 Enlarged view of middle C;

[0034] Figure 5 yes Figure 1 Enlarged view of middle D;

[0035] Figure 6 yes Figure 1 Enlarged view of E in the middle;

[0036] Figure 7 yes Figure 1 Enlarged view of middle F;

[0037] Figure 8 It is a schematic structural diagram of a preferred embodiment of the contact electric cleaning device of embodiment 3;

[0038] Fig. 9 It is a schematic structural diagram of another preferred embodiment of the contact electric cleaning device of embodiment 3;

[0039] The markings of the components in the accompanying drawings are as follows:

[0040] 101. a first mounting platform, 201. a second mounting platform, 301. a support rod, 401. a relay base, 501. a power indicator light, 601. a small circuit breaker. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1-9 : Embodiment 1:

[0044] The present embodiment relates to a contact electric cleaning control system, which includes a power supply circuit, a terminal block and a contact electric cleaning control circuit.

[0045] Specifically, the first is the power supply circuit, which can provide a stable power supply to meet the cleaning operation requirements of different relay contacts, including: power supply, circuit breaker Q1, emergency stop button SA7, power module JK1, power module JK2, power module JK3 and conversion switch SA2.

[0046] The live wire L and the neutral wire N of the power supply are connected to the input end of the circuit breaker Q1, and the output end of the circuit breaker Q1 is connected to the emergency stop button SA7 and then connected to the input ends of the power module JK1, the power module JK2 and the power module JK3 respectively;

[0047] The output ends of the power modules JK1, JK2 and JK3 are respectively connected to pins 1 / 2, 3 / 4 and 7 / 8 of the terminal block, and the power converted by the power modules JK1, JK2 and JK3 is connected to the conversion switch SA2 through the terminal block.

[0048] In detail, pins 1 / 2, 3 / 4, and 7 / 8 of the terminal block are respectively connected to the input connection points 7 / 11, 3 / 5, and 1 / 9 of the conversion switch SA2, the output connection points 2 / 4 / 8 of the conversion switch SA2 are short-circuited by a ring line and connected to pin 17 of the terminal block, and the output connection points 6 / 10 / 12 of the conversion switch SA2 are short-circuited by a ring line and connected to pin 16 of the terminal block.

[0049] Furthermore, the power supply is 220V AC, the power module JK1 converts the 220V power supply into a 24V DC power supply for power supply, the power module JK2 converts the 220V power supply into a 110V DC power supply for power supply, the power module JK3 converts the 220V power supply into a 48V DC power supply for power supply, and the circuit breaker Q1 is used for on-off control of the 220V access power supply of the power module JK1, the power module JK2 and the power module JK3.

[0050] The power supply process of the power supply circuit includes a power input stage, a power conversion stage, and a voltage selection and output stage.

[0051] During the power input stage: 220V AC is connected to the system through circuit breaker Q1, and the output end of circuit breaker Q1 is connected to the emergency stop button SA7 to ensure that the power can be quickly cut off in an emergency.

[0052] In the power conversion stage: the 220V AC power after passing through the emergency stop button SA7 is input into the power modules JK1, JK2 and JK3 respectively, and the 220V AC power is converted into the required DC voltage; among which the power module JK1 outputs 24V DC power, the power module JK2 outputs 110V DC power, and the power module JK3 outputs 48V DC power.

[0053] In the voltage selection and output stage: the converted DC power supply is connected to the conversion switch SA2 through the terminal block. According to the working voltage requirement of the cleaned relay, the operator can select the corresponding voltage gear through the conversion switch SA2.

[0054] For example: if the working voltage of the cleaned relay is 48VDC, switch SA2 to the 48VDC position; if the working voltage of the cleaned relay is 24VDC, switch SA2 to the 24VDC position; if the working voltage of the cleaned relay is 110VDC, switch SA2 to the 110VDC position.

[0055] The above power supply circuit is flexible, safe and stable. Through the conversion switch SA2 power supply circuit, the power supply output can be flexibly switched according to the working voltage requirements of different relays, thereby improving the versatility and applicability.

[0056] Circuit breaker Q1 and emergency stop button SA7 ensure that the power supply can be quickly cut off in abnormal situations to protect the safety of equipment and operators;

[0057] The power module converts 220V AC power into a stable DC power supply, providing a reliable working voltage for the contact electric cleaning control circuit and ensuring the stable operation of the circuit.

[0058] Next is the contact electrical cleaning control circuit, which is used to realize the control cleaning operation of the cleaned relay contacts, including: start button SB1, stop button SB2, intermediate relay KA5, intermediate relay KA6, time relay KT, cleaned relay KA1, cleaned relay KA2, cleaned relay KA3, cleaned relay KA4, resistor R1, resistor R2 and resistor R3.

[0059] Furthermore, the output end of the power module JK2 is connected in series with the normally open point of the start button SB1, the normally closed point of the stop button SB2, and the normally closed point of the time relay KT in sequence, and then connected to one end of the coil of the intermediate relays KA5 and KA6. The other ends of the coils of the intermediate relays KA5, KA6 and the time relay KT are connected to the neutral line N of the power supply.

[0060] The normally open point of the start button SB1 serves as a starting signal. When pressed, it allows current to pass to activate the subsequent circuit. The normally closed point of the stop button SB2 serves as a safety control. When pressed, it cuts off the circuit to stop all operations. The stop button SB2 allows the user to interrupt the cleaning process at any time, which improves the flexibility and safety of operation.

[0061] Furthermore, one end of the coil of the time relay KT is connected to the middle point of the normally closed point of the stop button SB2 and the normally closed point of the time relay KT in series. This connection method ensures that the coil of KT can only be energized when the stop button SB2 is not pressed and KT itself is not in action.

[0062] Furthermore, after the intermediate relays KA5 and KA6 are energized and self-locked, their respective second normally open contacts KA5-2 and KA6-2 are closed to energize the coils of the cleaned relays KA1 and KA2, and the coils of the cleaned relays KA3 and KA4, respectively.

[0063] In detail, the two ends of the normally open point of the start button SB1 are connected in parallel with the first normally open contact KA5-1 of the intermediate relay KA5, the first normally open contact KA6-1 of the intermediate relay KA6 and the normally open point of the time relay KT to form a self-locking circuit. The power module JK2 is configured to provide a working voltage to the self-locking circuit. The self-locking circuit realizes the continuous power-on state of the circuit through the auxiliary contacts of the intermediate relays KA5 and KA6.

[0064] The self-locking circuit ensures the continuous operation of the cleaning control. Even if the start button SB1 is released, the intermediate relays KA5 and KA6 can still remain energized, which improves the convenience of operation and avoids the problem of needing to continuously hold down the button.

[0065] Furthermore, the connection method of the cleaned relay coils is: the second normally open contact KA5-2 of the intermediate relay KA5 is connected in parallel to one end of the coils of the cleaned relays KA1 and KA2, the second normally open contact KA6-2 of the intermediate relay KA6 is connected in parallel to one end of the coils of the cleaned relays KA3 and KA4, and the other ends of the coils of the cleaned relays KA1, KA2, KA3 and KA4 are connected in parallel to pin No. 16 of the terminal row; pin No. 17 of the terminal row is respectively connected to the second normally open contact KA5-2 of the intermediate relay KA5 and the second normally open contact KA6-2 of the intermediate relay KA6.

[0066] Furthermore, the circuit on-off time of the time relay KT is set to 0.1-1S, preferably 0.2S, that is, the contact of the time relay KT switches state every 0.2 seconds, which is used to control the on-off frequency of the cleaned relay contact, thereby realizing the electrical cleaning function of the contact.

[0067] The time relay KT ensures the periodic switching of the cleaned relay contacts. This rapid switching ensures that the contacts generate enough arc to ablate contaminants without excessive damage when energized, effectively removing the oxide layer and contaminants on the contact surface and restoring the conductive properties of the contacts.

[0068] Furthermore, the connection method of the cleaned relay contacts is as follows: the auxiliary contacts of the cleaned relays KA1, KA2, KA3 and KA4 are respectively connected in parallel to pins 7, 10, 11 and 12 of the terminal block.

[0069] In detail, the auxiliary contacts 2 / 4 / 6 of the cleaned relay KA1, the auxiliary contacts 5 / 6 / 7 of the cleaned relay KA2, the auxiliary contacts 5 / 6 / 7 of the cleaned relay KA3 and the auxiliary contacts 5 / 6 / 7 of the cleaned relay KA4 are connected in parallel to pin 7 of the terminal block.

[0070] The auxiliary contact 3 of the cleaned relay KA1, the auxiliary contact 3 of the cleaned relay KA2, the auxiliary contact 4 of the cleaned relay KA3 and the auxiliary contact 3 of the cleaned relay KA4 are connected in parallel to pin No. 10 of the terminal block.

[0071] The auxiliary contact 7 of the cleaned relay KA1, the auxiliary contact 2 of the cleaned relay KA2, the auxiliary contact 9 of the cleaned relay KA3 and the auxiliary contact 2 of the cleaned relay KA4 are connected in parallel to pin No. 11 of the terminal block.

[0072] The auxiliary contact 5 of the cleaned relay KA1, the auxiliary contact 10 of the cleaned relay KA2, the auxiliary contact 8 of the cleaned relay KA3 and the auxiliary contact 10 of the cleaned relay KA4 are connected in parallel to pin No. 12 of the terminal block.

[0073] The action process of the above-mentioned cleaned relay is:

[0074] Startup process:

[0075] When the start button SB1 is pressed, its normally open contact closes, and the power supply of the power module JK2 supplies power to the coils of the intermediate relays KA5 and KA6 through the normally closed contacts of SB1 and SB2 and the normally closed contact of the time relay KT.

[0076] The intermediate relays KA5 and KA6 are energized and attracted, and the corresponding first normally open contacts KA5-1 and KA6-1 are closed, which are connected in parallel with the normally open contact of the time relay KT to form a self-locking circuit. Even if the start button SB1 is released, the intermediate relays KA5 and KA6 can still remain energized;

[0077] Cleaning process:

[0078] The second normally open contacts KA5-2 and KA6-2 corresponding to the intermediate relays KA5 and KA6 are closed, and the coils of the cleaned relays KA1, KA2 and KA3, KA4 are energized.

[0079] The on-off time of the time relay KT is 0.2 seconds. The contact of the time relay KT switches state every 0.2 seconds. The periodic on-off operation makes the contacts KA1, KA2, KA3, and KA4 of the cleaned relay also switch on and off at a frequency of 0.2 seconds, thereby realizing the electrical cleaning function of the contacts;

[0080] Stop process:

[0081] When the stop button SB2 is pressed, its normally closed contacts are disconnected, cutting off the power supply of the intermediate relays KA5, KA6 and the time relay KT. The intermediate relays KA5 and KA6 lose power and are released, the contacts KA5-1, KA6-1, KA5-2 and KA6-2 are reset, the coil of the cleaned relay is de-energized, and the cleaning process stops.

[0082] Furthermore, the X1 pins of the resistors R1, R2 and R3 are connected to the 10 / 11 / 12 pins of the terminal row respectively, the X2 pins of the resistors R1, R2 and R3 are connected in parallel to the 9 pin of the terminal row, and the 8 pin and the 9 pin of the terminal row are connected by a short-circuit wire.

[0083] When working, the current flows from pins 10, 11 and 12 of the terminal block through resistors R1, R2 and R3 respectively. The other ends (pin X2) of resistors R1, R2 and R3 are connected in parallel to pin 9 of the terminal block. The current flows to pin 8 through the short-circuit wire, forming a complete loop.

[0084] During the cleaning process of the relay contacts, the on and off of the contacts will cause the current to increase instantaneously. Resistors R1, R2, and R3 can limit this overcurrent phenomenon and protect the relay contacts from damage.

[0085] Among them, resistors R1, R2 and R3 are load resistors RXG24-500W-36RF, which ensure that the current is stable during the cleaning process and does not exceed the rated current of the relay contacts.

[0086] Optionally, the resistors R1, R2 and R3 may be adjustable resistors, so that the electrical breakdown current is controllable and adjustable, and the use range of the electric cleaning relay is wider and more accurate.

[0087] Pins 8 and 9 of the terminal block are connected by a shorting wire to ensure that a stable current passes through the contacts when cleaning, thereby achieving an effective cleaning effect.

[0088] The cleaning principle of the contact electric cleaning control system of this embodiment is:

[0089] Providing a corresponding power supply and load configuration for the cleaned relay, and increasing the load so that the current passing through the cleaned relay contacts is maintained at 1-1.5A;

[0090] Add a time relay in the start control circuit and adjust its setting time to 0.2S. After pressing the start button, the control circuit will automatically enter the cycle on-off state after a delay of 0.5S, thereby driving the contacts of the cleaned relay to continuously switch on and off;

[0091] The contacts of the cleaned relay experience rapid switching while passing a current of about 1-1.5A, and the contacts will continuously generate continuous electric sparks. The electric sparks can effectively decompose and remove the oxides accumulated on the contact surface due to their high temperature characteristics, thereby reducing the contact resistance of the contacts and ensuring that the contact resistance of the relay contacts is ≤300 mΩ, meeting the requirements of daily use and overhaul and maintenance.

[0092] The above-mentioned contact electrical cleaning control circuit can realize periodic cleaning of relay contacts, has a self-locking function, is more flexible, safe and reliable, and can realize effective cleaning of relay contacts while also enhancing the protection function of the circuit. Embodiment 2:

[0093] The present embodiment relates to a contact electric cleaning device for installing and connecting configured electrical components, including: a first mounting platform 101 and a second mounting platform 201, wherein the four corners of the first mounting platform 101 and the second mounting platform 201 are interconnected by support rods 301 to form a mounting frame.

[0094] The first mounting platform 101 is provided with a start button SB1, a stop button SB2 and an emergency stop button SA7 to ensure that the machine can be started, stopped and emergency stopped according to the user's instructions;

[0095] Four relay bases 401 are arranged at intervals in the middle of the first mounting platform 101, and are used to mount the cleaned relays KA1, KA2, KA3 and KA4 respectively;

[0096] At the same time, the first mounting platform 101 is also provided with a power conversion switch SA2 and at least three corresponding power indicator lights 501. The conversion switch allows the user to select a suitable power input according to actual needs, and the power indicator light 501 is used to display the power status in real time to ensure the safety of the operation process.

[0097] The second mounting platform 201 mainly bears the load and control functions of the electrical components. Three power load resistors R1, R2 and R3, and power modules JK1, JK2 and JK3 are arranged on the second mounting platform 201 to realize the distribution and management of power supply;

[0098] In addition, the second mounting platform 201 is also equipped with an intermediate relay KA1, an intermediate relay KA2 and a time relay KT, which can control the on and off of the circuit as needed to achieve automatic circuit control and protection. The time relay KT is used to set a specific time delay. Embodiment three:

[0099] The present embodiment relates to a contact electric cleaning control system, which can be applied to contact maintenance of small contactors, small circuit breakers 601, etc.

[0100] The contact inspection requirements of small contactors are consistent with those of relay contacts. Since the contactor has no base for installation and is an integral structure, alligator clips can be used on the contact electric cleaning device to lead out the coil and contact wiring points respectively. By using the corresponding alligator clips to connect the corresponding coil and contact of the contactor, the contact cleaning can also be performed.

[0101] In the contact electric cleaning control system of this embodiment, the contact electric cleaning control circuit is based on the embodiment 1, and may further include a circuit breaker Q2 and a contactor KM1 for cleaning the contacts of small contacts and relays.

[0102] Specifically, the incoming line point of the circuit breaker Q2 is connected to pin 7 of the terminal block, the outgoing line point of the circuit breaker Q2 is respectively connected to contact clamps KM1-2 and KM1-4 of the contactor KM1, and pins 18 / 20 of the terminal block are respectively connected to contact clamps KM1-1 and KM1-3 of the contactor KM1.

[0103] Pin No. 16 of the terminal block is connected to the negative pole KM1-A2 of the external coil clamp of the contactor KM1, and the auxiliary contact 1 of the cleaned relay KA1 is connected to the positive pole KM1-A1 of the external coil clamp of the contactor KM1. The positive pole KM1-A1 of the external coil clamp is also connected to the second normally open contact KA5-2 of the intermediate relay KA5, thereby realizing the on-off control of the coil clamp KM2.

[0104] Pin No. 10 and pin No. 20 of the terminal block are connected with a short-circuit wire, and pin No. 11 and pin No. 18 of the terminal block are connected with a short-circuit wire. It is mainly used for temporary electrical cleaning of external small circuit breakers, small contactors or other types of relays, which enhances versatility and expansibility. Embodiment 4:

[0105] This embodiment relates to a contact electrical cleaning method, which can clean and repair relays with large contact resistance, and includes the following steps:

[0106] S1. Install the coils of the cleaned relays KA1, KA2, KA3, and KA4 on the corresponding relay bases 401 respectively. KA1 and KA2 are used to break down the normally open contacts, and KA3 and KA4 are used to break down the normally closed contacts. The corresponding relay base 401 can be selected according to the status of different relay contacts.

[0107] S2, input 220V power through circuit breaker Q1, and the 220V power is converted into 24V DC power, 48V DC power and 110V DC power through power modules JK1, JK2 and JK3 respectively to provide working voltage. The converted DC power is connected to the conversion switch SA2. According to the working voltage of the cleaned relay, the conversion switch SA2 is moved to the corresponding gear.

[0108] S3. Connect resistors R1, R2, and R3 in series to the contact circuit of the relay base 401 to be cleaned, as loads during electrical cleaning.

[0109] S4. In order to ensure that the electric cleaning system can cover the electric cleaning of other small circuit breakers, contactors and other types of relays and contactor contacts with small current (below 20A), use a small external alligator clip to lead out the corresponding line. The electric cleaning function can be used temporarily to increase versatility. This step is optional.

[0110] S5. Combine the start button SB1, stop button SB2, intermediate relays KA5, KA6 and time relay KT into a self-locking circuit, and adjust the circuit on-off time of the time relay to 0.2S.

[0111] S6. Press the start button SB1. After the intermediate relays KA5 and KA6 are energized and self-locked, their auxiliary contacts KA5-2 and KA6-2 energize the coils of the cleaned relays KA1, KA2 and KA3, KA4 respectively, and electrical cleaning begins.

[0112] S7. The contacts of the relay being cleaned are continuously switched on and off with a cycle of 0.2S, and the process lasts for about 30S. During the cleaning process, resistors R1, R2, and R3 ensure the stability of the current to achieve electrical breakdown and cleaning of the contacts.

[0113] After S8 and 30S, press the stop button SB2 to cut off the control system, release the intermediate relays KA5 and KA6, and the cleaning is completed.

[0114] S9. Re-test the contact resistance of the cleaned relay after electrical cleaning: if the contact resistance value meets ≤300mΩ, the cleaning is passed and the relay can be used normally; if the contact resistance value is greater than 300mΩ, repeat the above cleaning operation until the contact resistance value meets the requirements.

[0115] The beneficial effects of the contact electric cleaning control system and cleaning method of the present invention are:

[0116] 1. Versatility and expandability: The pre-installed relay base can adapt to various types of relays to meet the cleaning needs of different equipment; through the external small alligator clip, it can temporarily clean the contacts of small circuit breakers or other types of relays, which enhances versatility and expandability;

[0117] 2. Clean, efficient and flexible: The electrical breakdown frequency is adjusted through the time relay, which is flexible and controllable. By periodically switching the power on and off, electric sparks are generated to break down the oxides on the contact surface, effectively removing the oxide layer and pollutants on the relay contacts. The qualified rate of the contacts after cleaning exceeds 95%, greatly saving the cost of relay replacement;

[0118] 3. The power output can be flexibly switched according to the working voltage of the relay through the conversion switch, which is suitable for relays of different voltage levels;

[0119] 4. It has a self-locking function to ensure the continuous stability of the cleaning process and avoid interruption of cleaning due to misoperation. The safety and reliability of the control process are enhanced through current limiting resistors and circuit breaker protection;

[0120] 5. The operator can easily control the cleaning process through the start button and stop button to improve the convenience of operation. After cleaning, the cleaning effect is verified by contact resistance test to ensure that the conductive performance of the relay contacts meets the requirements.

[0121] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A contact electric cleaning control system, characterized in that: include: Power supply circuit, terminal block and contact electric cleaning control circuit: The power supply circuit includes: a power supply, a circuit breaker Q1, an emergency stop button SA7, a power module JK1, a power module JK2, a power module JK3 and a conversion switch SA2. The live wire L and the neutral wire N of the power supply are connected to the input end of the circuit breaker Q1, and the output end of the circuit breaker Q1 is connected to the emergency stop button SA7 and then connected to the input ends of the power module JK1, the power module JK2 and the power module JK3 respectively. The output ends of the power modules JK1, JK2 and JK3 are respectively connected to the 1 / 2 pins, 3 / 4 pins and 7 / 8 pins of the terminal block to provide working voltage for the contact cleaning control circuit. The power converted by the power modules JK1, JK2 and JK3 is connected to the conversion switch SA2 through the terminal block; The contact electric cleaning control circuit comprises: Start button SB1, stop button SB2, intermediate relay KA5, intermediate relay KA6, time relay KT, cleaned relay KA1, cleaned relay KA2, cleaned relay KA3, cleaned relay KA4, resistor R1, resistor R2 and resistor R3, The output end of the power module JK2 is connected in series with the normally open point of the start button SB1, the normally closed point of the stop button SB2, and the normally closed point of the time relay KT in sequence, and then connected to one end of the coil of the intermediate relays KA5 and KA6. One end of the coil of the time relay KT is connected to the middle point of the series connection of the normally closed point of the stop button SB2 and the normally closed point of the time relay KT. The other ends of the coils of the intermediate relays KA5, KA6 and the time relay KT are connected to the neutral line N of the power supply; After the intermediate relays KA5 and KA6 are powered on and self-locked, their respective second normally open contacts KA5-2 and KA6-2 are closed to energize the coils of the cleaned relays KA1 and KA2, and the coils of the cleaned relays KA3 and KA4, respectively; The auxiliary contacts of the cleaned relays KA1, KA2, KA3 and KA4 are respectively connected in parallel to pins 7, 10, 11 and 12 of the terminal block; The X1 pins of the resistors R1, R2 and R3 are connected to the No. 10 / 11 / 12 pins of the terminal row respectively, and the X2 pins of the resistors R1, R2 and R3 are connected in parallel to the No. 9 pin of the terminal row.

2. The contact electric cleaning control system according to claim 1, characterized in that: The power supply is 220V AC power, the power module JK1 converts the 220V power supply into a 24V DC power supply for power supply, the power module JK2 converts the 220V power supply into a 110V DC power supply for power supply, the power module JK3 converts the 220V power supply into a 48V DC power supply for power supply, and the circuit breaker Q1 is used for on-off control of the 220V access power supply of the power modules JK1, JK2 and JK3.

3. The contact electric cleaning control system according to claim 1, characterized in that: The two ends of the normally open point of the start button SB1 are connected in parallel to the first normally open contact KA5-1 of the intermediate relay KA5, the first normally open contact KA6-1 of the intermediate relay KA6 and the normally open point of the time relay KT to form a self-locking circuit. The power module JK2 is configured to provide a working voltage to the self-locking circuit. The self-locking circuit realizes a continuous power-on state of the circuit through the auxiliary contacts of the intermediate relays KA5 and KA6.

4. The contact electric cleaning control system according to claim 1, characterized in that: Pin No. 17 of the terminal block is connected to the second normally open contact KA5-2 of the intermediate relay KA5 and the second normally open contact KA6-2 of the intermediate relay KA6, respectively. The second normally open contact KA5-2 of the intermediate relay KA5 is also connected in parallel to one end of the coils of the cleaned relays KA1 and KA2. The second normally open contact KA6-2 of the intermediate relay KA6 is also connected in parallel to one end of the coils of the cleaned relays KA3 and KA4, and the other ends of the coils of the cleaned relays KA1, KA2, KA3 and KA4 are connected in parallel to pin 16 of the terminal block.

5. The contact electric cleaning control system according to claim 3, characterized in that: The circuit on-off time of the time relay KT is set to 0.1-1S.

6. The contact electric cleaning control system according to claim 1, characterized in that: Pins 1 / 2, 3 / 4, and 7 / 8 of the terminal block are connected to input connection points 7 / 11, 3 / 5, and 1 / 9 of the conversion switch SA2, respectively. The output connection points 2 / 4 / 8 of the conversion switch SA2 are short-circuited by a ring line and connected to pin 17 of the terminal block, and the output connection points 6 / 10 / 12 of the conversion switch SA2 are short-circuited by a ring line and connected to pin 16 of the terminal block.

7. The contact electric cleaning control system according to claim 1, characterized in that: The auxiliary contacts 2 / 4 / 6 of the cleaned relay KA1, the auxiliary contacts 5 / 6 / 7 of the cleaned relay KA2, the auxiliary contacts 5 / 6 / 7 of the cleaned relay KA3 and the auxiliary contacts 5 / 6 / 7 of the cleaned relay KA4 are connected in parallel to pin 7 of the terminal block; The auxiliary contact 3 of the cleaned relay KA1, the auxiliary contact 3 of the cleaned relay KA2, the auxiliary contact 4 of the cleaned relay KA3 and the auxiliary contact 3 of the cleaned relay KA4 are connected in parallel and connected to pin No. 10 of the terminal row; The auxiliary contact 7 of the cleaned relay KA1, the auxiliary contact 2 of the cleaned relay KA2, the auxiliary contact 9 of the cleaned relay KA3 and the auxiliary contact 2 of the cleaned relay KA4 are connected in parallel to the pin 11 of the terminal block; The auxiliary contact 5 of the cleaned relay KA1, the auxiliary contact 10 of the cleaned relay KA2, the auxiliary contact 8 of the cleaned relay KA3 and the auxiliary contact 10 of the cleaned relay KA4 are connected in parallel to pin No. 12 of the terminal block.

8. The contact electric cleaning control system according to claim 1, characterized in that: Pin No. 8 and pin No. 9 of the terminal row are connected by a shorting wire, pin No. 10 and pin No. 20 of the terminal row are connected by a shorting wire, and pin No. 11 and pin No. 18 of the terminal row are connected by a shorting wire.

9. The contact electric cleaning control system according to claim 1, characterized in that: The contact cleaning control circuit may further include a circuit breaker Q2 and a contactor KM1. The incoming line point of the circuit breaker Q2 is connected to pin 7 of the terminal block, and the outgoing line points of the circuit breaker Q2 are respectively connected to the contact clamps KM1-2 and KM1-4 of the contactor KM1. Pins 18 and 20 of the terminal block are connected to contact clips KM1-1 and KM1-3 of contactor KM1 respectively. Pin No. 16 of the terminal block is connected to the negative pole KM1-A2 of the external coil clamp of the contactor KM1, and the auxiliary contact 1 of the cleaned relay KA1 is connected to the positive pole KM1-A1 of the external coil clamp of the contactor KM1. The positive pole KM1-A1 of the external coil clamp is also connected to the second normally open contact KA5-2 of the intermediate relay KA5.

10. A cleaning method for a contact electric cleaning control system, characterized in that: The steps include: S1. Install the coils of the cleaned relays KA1, KA2, KA3, and KA4 on the corresponding relay bases. KA1 and KA2 are used to break down the normally open contacts, and KA3 and KA4 are used to break down the normally closed contacts. The corresponding relay base can be selected according to the status of different relay contacts. S2, input 220V power through circuit breaker Q1, 220V power is converted into 24V DC power, 48V DC power and 110V DC power through power modules JK1, JK2 and JK3 respectively, to provide working voltage, the converted DC power is connected to the conversion switch SA2, according to the working voltage of the cleaned relay, the conversion switch SA2 is toggled to the corresponding gear; S3, connect resistors R1, R2, and R3 in series to the contact circuit of the relay base to be cleaned, as the load during electrical cleaning; S4, combine the start button SB1, the stop button SB2, the intermediate relays KA5, KA6 and the time relay KT into a self-locking circuit, and adjust the circuit on-off time of the time relay to 0.2S; S5. Press the start button SB1. After the intermediate relays KA5 and KA6 are powered on and self-locked, their auxiliary contacts KA5-2 and KA6-2 energize the coils of the cleaned relays KA1, KA2, KA3, and KA4, respectively, to start electrical cleaning. S6. The contacts of the cleaned relay are continuously switched on and off with a cycle of 0.2S, and the process lasts for about 30S. During the cleaning process, resistors R1, R2, and R3 ensure the stability of the current, so as to achieve electrical breakdown and cleaning of the contacts. S7, 10-30S later, press the stop button SB2 to cut off the control system, the intermediate relays KA5 and KA6 are released, and the cleaning is completed; S8. Re-test the contact resistance of the cleaned relay after electrical cleaning: If the contact resistance value is ≤300mΩ, the cleaning is passed and the relay can be used normally; If the contact resistance value is greater than 300 mΩ, repeat the above cleaning operation until the contact resistance value meets the requirements.

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