Contactor pull-in automatic detection circuit
By designing the contactor suction and joint automatic detection circuit, the counting relay and cycle delay relay are used to achieve accurate control of the number of contactor suction and release times and time, solving the problem of time and inaccurate detection in the prior art, and improving detection accuracy and efficiency.
Patent Information
- Application Number
- CN202411555522.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2024-12-27
AI Technical Summary
The existing contactor suction and release performance detection methods consume a lot of time and manpower, and the control time interval is not accurate enough, making errors prone to occur, especially when a large amount of detection is required and time requirements are strictly required.
An automatic detection circuit for contactor suction and joint detection is designed, including power circuit and control circuit. The counting relay and cycle delay relay are used to accurately control the number of times and time of suction and joint removal, and automatic detection is achieved through the start and stop button.
It realizes accurate measurement and control of the number and time of contactor suction and release, improves the accuracy and reliability of detection, simplifies the operation process, saves manual labor, and is suitable for high-demand testing tasks.
Smart Images
Figure CN119199511A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of contactor pull-in detection, and in particular to a contactor pull-in automatic detection circuit. Background Art
[0002] At present, the contactor's pull-in and release performance testing, reliability testing and aging testing are generally carried out manually with a DC power supply. The specific operation includes: the worker manually controls the DC regulated power supply to achieve the pull-in and release of the contactor, and records the number of pull-ins after a certain time interval. This process needs to be repeated until the predetermined number of tests is completed. This method is suitable for occasions where the number of tests is small and the requirements for the pull-in and release time of the contactor are not strict.
[0003] However, this method has obvious shortcomings when a large number of tests (for example, more than 200 times) are required and the contactor closing and releasing time are strictly regulated. It not only consumes a lot of time and human resources, but also is not accurate enough in controlling the time interval between contactor closing and releasing, and it is also easy to make mistakes in the counting process.
[0004] Therefore, in order to provide a more accurate, efficient and automated detection method for high-demand detection tasks, it is necessary to seek a more accurate and automated detection method. Summary of the invention
[0005] In view of this, in order to overcome the deficiencies of the prior art, the present invention aims to provide a contactor pull-in automatic detection circuit.
[0006] The present invention provides a contactor automatic detection circuit for closing, which is composed of a power circuit and a control circuit. The power circuit includes a power supply, a circuit breaker, a contactor main contact, a thermal relay and a contactor to be detected. The power supply supplies power to the contactor to be detected through the circuit breaker, the contactor main contact and the thermal relay. The control circuit includes a start-stop button, a thermal relay contact, a counting relay, a cycle delay relay, a contactor coil and a leakage diode. The control circuit controls the closing and releasing times and the closing and releasing times of the power circuit.
[0007] Preferably, in the contactor closure automatic detection circuit of the present invention, the power supply is connected to the counting power input terminal of the counting relay and the cycle delay power input terminal of the cycle delay relay through a start-stop button, and the output voltage is used to provide working power for the contactor to be detected, the cycle delay relay and the counting relay.
[0008] Preferably, in the contactor automatic detection circuit of the present invention, the circuit breaker is connected between the power supply and the contactor main contacts to control the power supply of the power circuit, the contactor main contacts are connected between the circuit breaker output end and the thermal relay to control the power supply of the contactor coil to be detected, and the thermal relay is connected between the contactor main contact output end and the contactor coil to be detected to protect the safety of the power circuit.
[0009] Preferably, in the contactor automatic detection circuit of the present invention, the start-stop button is connected between the power supply and the counting power input terminal of the counting relay and the cycle delay power input terminal of the cycle delay relay, and is used to control the power supply of the counting relay, the cycle delay relay and the contactor coil.
[0010] Preferably, in the contactor pull-in automatic detection circuit of the present invention, the thermal relay contact is connected between the start / stop button and the power supply circuit of the contactor coil, so as to protect the power supply safety of the power circuit and the contactor to be detected.
[0011] Preferably, in the contactor automatic detection circuit of the present invention, the counting relay includes a counting power input terminal, a counting normally open contact, a counting normally closed contact and a counting input terminal. The counting power input terminal is used to provide working power to the counting relay. When a pre-designed value is reached, the counting relay is activated and the counting normally open contact is closed. When the pre-designed value is reached, the counting relay is activated and the counting normally closed contact is released. The counting input terminal is used to connect a counting short-circuit signal.
[0012] Preferably, in the contactor automatic detection circuit of the present invention, the cycle delay relay includes a cycle delay power input terminal, a cycle delay first normally closed contact and a cycle delay second normally closed contact. The cycle delay power input terminal is used to provide working power for the cycle delay relay. When the preset pull-in time is reached, the cycle delay relay is actuated and the cycle delay first normally closed contact is released. When the preset release time is reached, the cycle delay relay is actuated and the cycle delay first normally closed contact is closed. When the preset pull-in time is reached, the cycle delay relay is actuated and the cycle delay second normally closed contact is released. When the preset release time is reached, the cycle delay relay is actuated and the cycle delay second normally closed contact is closed.
[0013] Preferably, in the contactor automatic detection circuit of the present invention, the cyclic delay second normally closed contact of the cyclic delay relay is connected in series in the power supply circuit of the contactor coil, which is used to control the contactor coil's contact time and release time, and cyclically release and attract actions until the counting normally closed contact of the counting relay is disconnected and stops the action.
[0014] Preferably, in the contactor automatic detection circuit of the present invention, the counting relay is used to record the number of times the contactor main contacts are powered on, and the counting normally closed contacts of the counting relay are connected in series in the power supply circuit of the contactor coil. When the counting relay reaches a preset count value, the counting normally closed contact is actuated to cut off the power supply to the contactor coil. The detection ends and the power supply to the contactor coil is cut off. The counting input terminal is connected to the second normally closed contact of the cycle delay relay for detecting the number of times the cycle delay relay is actuated.
[0015] Preferably, in the contactor closing automatic detection circuit of the present invention, the contactor coil is used to control the closing and opening of the contactor main contacts of the power circuit, and the leakage diode is connected in parallel with the contactor coil to protect the contactor coil from damage by the inductive back electromotive force.
[0016] The contactor pull-in automatic detection circuit of the present invention has the following beneficial technical effects: 1. Directly use relays with adjustable counting value, pull-in time and release time, with simple circuit structure and convenient design; 2. It can accurately measure and control the relay counting value, pull-in time and release time, and the detection method has high accuracy and reliability; 3. Only one start button is needed, which is simple to operate and fast to detect, saving manual repetitive labor; 4. It has broad application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 This is a circuit diagram of a contactor automatic detection circuit according to an embodiment of the present invention; Figure 2 This is an example diagram of a power circuit of a contactor pull-in automatic detection circuit according to an embodiment of the present invention; Figure 3 This is an example diagram of a control circuit of a contactor pull-in automatic detection circuit according to an embodiment of the present invention; Among them, 1-power circuit, 2-control circuit, 11-power supply, 12-circuit breaker, 13-contactor main contact, 14-thermal relay, 15-contactor to be detected, 21-start and stop button, 22-thermal relay contact, 23-counting relay, 24-cycle delay relay, 25-contactor coil, 26-leakage diode, 231-counting power input terminal, 232-counting normally open contact, 233-counting normally closed contact, 234-counting input terminal, 241-cycle delay power input terminal, 242-cycle delay first normally closed contact, 243-cycle delay second normally closed contact. DETAILED DESCRIPTION
[0019] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0020] It should be noted that the following embodiments and features in the embodiments may be combined with each other in the absence of conflict; and, based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making any creative work are within the scope of protection of the present disclosure.
[0021] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.
[0022] Figure 1 The figure is a circuit diagram of a contactor automatic detection circuit according to an embodiment of the present invention.
[0023] like Figure 1 As shown, the contactor closing automatic detection circuit in this embodiment is composed of a power circuit 1 and a control circuit 2.
[0024] Figure 2 FIG. 1 is a power circuit diagram of a contactor automatic detection circuit according to an embodiment of the present invention. Figure 1 and Figure 2As shown, the power circuit 1 of this embodiment includes a power supply 11, a circuit breaker 12, a contactor main contact 13, a thermal relay 14 and a contactor to be detected 15. The power supply 11 supplies power to the contactor to be detected 15 through the circuit breaker 12, the contactor main contact 13 and the thermal relay 14. For example, the power supply 11 of this embodiment is connected to the wiring terminal of the contactor to be detected 15 through the circuit breaker 12, the contactor main contact 13 and the thermal relay 14.
[0025] As an optional example, in this embodiment, the circuit breaker 12 is connected between the power supply 11 and the contactor main contact 13, and is used to control the power supply of the power circuit 1. The contactor main contact 13 is connected between the output end of the circuit breaker 12 and the thermal relay 14, and is used to control the power supply of the coil of the contactor 15 to be detected. The thermal relay 14 is connected between the output end of the contactor main contact 13 and the coil of the contactor 15 to be detected, and is used to protect the safety of the power circuit 1.
[0026] Figure 3 FIG. 1 is an exemplary diagram of a control circuit of a contactor automatic detection circuit according to an embodiment of the present invention. Figure 1 and Figure 3 As shown, the control circuit 2 of this embodiment includes a start / stop button 21 , a thermal relay contact 22 , a counting relay 23 , a cycle delay relay 24 , a contactor coil 25 and a leakage diode 26 .
[0027] Among them, the start-stop button 21 is connected between the power supply 11 and the counting power input terminal 231 of the counting relay 23 and the cycle delay power input terminal 241 of the cycle delay relay 24, and is used to control the power supply of the counting relay 23, the cycle delay relay 24 and the contactor coil 25.
[0028] The thermal relay contact 22 is connected between the start / stop button 21 and the power supply circuit of the contactor coil 25 to protect the power supply safety of the power circuit 1 and the contactor 15 to be detected.
[0029] In this embodiment, the counting relay 23 is used to detect the number of times the contactor 15 to be detected is closed and released. As an optional example, the counting relay 23 includes a counting power input terminal 231, a counting normally open contact 232, a counting normally closed contact 233, and a counting input terminal 234. The counting power input terminal 231 is used to provide working power to the counting relay 23. When the pre-designed value is reached, the counting relay 23 is actuated and the counting normally open contact 232 is closed. When the pre-designed value is reached, the counting relay 23 is actuated and the counting normally closed contact 233 is released. The counting input terminal 234 is used to connect the counting short-circuit signal.
[0030] In this embodiment, the cycle delay relay 24 is used to control the pull-in time and release time of the contactor to be detected 15. As an optional example, the cycle delay relay 24 includes a cycle delay power input terminal 241, a cycle delay first normally closed contact 242 and a cycle delay second normally closed contact 243. The cycle delay power input terminal 241 is used to provide working power for the cycle delay relay 24. When the preset pull-in time is reached, the cycle delay relay 24 is actuated, and the cycle delay first normally closed contact 242 is released. When the preset release time is reached, the cycle delay relay 24 is actuated, and the cycle delay first normally closed contact 242 is closed; when the preset pull-in time is reached, the cycle delay relay 24 is actuated, and the cycle delay second normally closed contact 243 is released. When the preset release time is reached, the cycle delay relay 24 is actuated, and the cycle delay second normally closed contact 243 is closed. The cyclic delay second normally closed contact 243 of the cyclic delay relay 24 is connected in series in the power supply circuit of the contactor coil 25, and is used to control the pull-in time and release time of the contactor coil 25, and cycle the above release and pull-in actions until the counting normally closed contact 233 of the counting relay 23 is disconnected and stops the action.
[0031] In this embodiment, the counting relay 23 is used to record the number of times the contactor main contact 13 is powered on, that is, the number of times the contactor 15 to be tested is powered on. The counting normally closed contact 233 of the counting relay 23 is connected in series in the power supply circuit of the contactor coil 25. When the counting relay 23 reaches a preset count value, that is, the number of times the contactor is pulled in reaches the set value, the counting normally closed contact 233 is actuated to cut off the power supply to the contactor coil 25, and the detection ends and the power supply to the contactor coil 25 is cut off. The counting input terminal 234 is connected to the second normally closed contact 243 of the cycle delay relay 24 for detecting the number of times the cycle delay relay 24 is actuated, that is, the number of times the contactor is pulled in.
[0032] For example, in this embodiment, the power supply 11 is connected to the counting power input terminal 231 of the counting relay 23 and the cycle delay power input terminal 241 of the cycle delay relay 24 through the start-stop button 21. The power supply 11 is a 27V DC power supply, and the output voltage is used to provide working power for the contactor 15 to be detected, the cycle delay relay 24 and the counting relay 23.
[0033] In this embodiment, the contactor coil 25 is used to control the closing and opening of the contactor main contact 13 of the power circuit 1, thereby controlling the power supply of the contactor to be detected. The leakage diode 26 is connected in parallel with the contactor coil 25 to protect the contactor coil 25 from damage by the inductive back electromotive force.
[0034] The application principle of the contactor automatic detection circuit of the present embodiment is as follows: before the detection starts, the numerical value, power-on time and power-off time are pre-set through the counting relay 23 and the cyclic delay relay 24; after the detection starts, the counting relay 23 and the cyclic delay relay 24 cooperate to automatically accumulate the number of times the contactor 15 to be detected is attracted and released, and the attraction time and release time are accurately controlled; the counting relay 23 accumulates the count value by detecting the number of times the contact of the cyclic delay relay 24 is closed, and the count value reaches the preset target count value, the counting relay 23 is actuated, and the detection control circuit is released; the cyclic delay relay 24 performs the contact attraction and release actions repeatedly according to the preset attraction time and release time, so as to achieve the purpose of accurately controlling the power supply of the contactor 15 to be detected.
[0035] In practical applications, the contactor pull-in automatic detection circuit of this embodiment has the following beneficial technical effects: 1. Directly use relays with adjustable counting value, pull-in time and release time, with simple circuit structure and convenient design; 2. It can accurately measure and control the relay counting value, pull-in time and release time, and the detection method has high accuracy and reliability; 3. Only one start button is needed, which is simple to operate and fast to detect, saving manual repetitive labor; 4. It has broad application prospects and promotion value.
[0036] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims
1. A contactor pull-in automatic detection circuit, characterized in that: The circuit is composed of a power circuit and a control circuit. The power circuit includes a power supply, a circuit breaker, a contactor main contact, a thermal relay and a contactor to be detected. The power supply supplies power to the contactor to be detected through the circuit breaker, the contactor main contact and the thermal relay. The control circuit includes a start / stop button, a thermal relay contact, a counting relay, a cycle delay relay, a contactor coil and a leakage diode. The control circuit controls the number of times and the time of the power circuit being pulled in and out.
2. The contactor pull-in automatic detection circuit according to claim 1 is characterized in that: The power supply is connected to the counting power input terminal of the counting relay and the cycle delay power input terminal of the cycle delay relay through the start-stop button, and the output voltage is used to provide working power for the contactor to be detected, the cycle delay relay and the counting relay.
3. The contactor pull-in automatic detection circuit according to claim 1 is characterized in that: The circuit breaker is connected between the power supply and the main contacts of the contactor to control the power supply of the power circuit. The main contacts of the contactor are connected between the output end of the circuit breaker and the thermal relay to control the power supply of the contactor coil to be detected. The thermal relay is connected between the output end of the main contacts of the contactor and the contactor coil to be detected to protect the safety of the power circuit.
4. The contactor pull-in automatic detection circuit according to claim 1 is characterized in that: The start-stop button is connected between the power supply and the counting power input terminal of the counting relay and the cycle delay power input terminal of the cycle delay relay, and is used to control the power supply of the counting relay, the cycle delay relay and the contactor coil.
5. The contactor pull-in automatic detection circuit according to claim 1 is characterized in that: The thermal relay contacts are connected between the start / stop button and the power supply circuit of the contactor coil to protect the power supply safety of the power circuit and the contactor to be tested.
6. The contactor pull-in automatic detection circuit according to claim 1, characterized in that: The counting relay includes a counting power input terminal, a counting normally open contact, a counting normally closed contact and a counting input terminal. The counting power input terminal is used to provide working power to the counting relay. When the pre-designed value is reached, the counting relay is activated and the counting normally open contact is closed. When the pre-designed value is reached, the counting relay is activated and the counting normally closed contact is released. The counting input terminal is used to connect the counting short-circuit signal.
7. The contactor pull-in automatic detection circuit according to claim 1, characterized in that: The cycle delay relay includes a cycle delay power input terminal, a cycle delay first normally closed contact and a cycle delay second normally closed contact. The cycle delay power input terminal is used to provide working power for the cycle delay relay. When the preset pull-in time is reached, the cycle delay relay operates and the cycle delay first normally closed contact is released. When the preset release time is reached, the cycle delay relay operates and the cycle delay first normally closed contact is closed. When the preset pull-in time is reached, the cycle delay relay operates and the cycle delay second normally closed contact is released. When the preset release time is reached, the cycle delay relay operates and the cycle delay second normally closed contact is closed.
8. The contactor pull-in automatic detection circuit according to claim 1, characterized in that: The second normally closed contact of the cyclic delay relay is connected in series in the power supply circuit of the contactor coil to control the contactor coil's pull-in time and release time, and performs release and pull-in actions in a cycle until the counting normally closed contact of the counting relay is disconnected and stops.
9. The contactor pull-in automatic detection circuit according to claim 1, characterized in that: The counting relay is used to record the number of times the contactor main contacts are powered on. The counting normally closed contact of the counting relay is connected in series in the power supply circuit of the contactor coil. When the counting relay reaches the preset count value, the counting normally closed contact acts to cut off the power supply to the contactor coil. The detection ends and the power supply to the contactor coil is cut off. The counting input terminal is connected to the second normally closed contact of the cycle delay relay for detecting the number of times the cycle delay relay acts.
10. The contactor pull-in automatic detection circuit according to claim 1, characterized in that: The contactor coil is used to control the closing and opening of the main contacts of the contactor in the power circuit. The leakage diode is connected in parallel with the contactor coil to protect the contactor coil from damage caused by the inductive back electromotive force.