Control system for enhancing performance of lifting electromagnet

Abstract

The utility model relates to a control system for enhancing the performance of a lifting electromagnet. The control system comprises an intelligent thyristor rectifier module MOD1, a resistor R1, a resistor R2, a first switch branch and a second switch circuit, a resistor R1 is connected between the first control end and the second control end of the intelligent thyristor rectifier module MOD1; a resistor R2 is connected between the second control end and the third control end of the intelligent thyristor rectifier module MOD1; the resistor R2 is connected in parallel with a first switch branch and a second switch branch. Under the condition that the internal structure of the electromagnet is not changed, the electric control system improves the working voltage of the electromagnet in the first 10 seconds to 297 VDC by improving the T1 secondary voltage, so that the electromagnet can attract more materials, then the voltage of the electromagnet is adjusted to the normal working voltage 220 VDC, it is guaranteed that the electromagnet has enough attraction force, and the electromagnet can attract more materials. And the working efficiency of the electromagnet is obviously improved.

Description

Technical Field

[0001] The utility model belongs to a matching device for a lifting electromagnet, in particular to a control system for enhancing the performance of the lifting electromagnet. Background Art

[0002] The normal working voltage of the lifting electromagnet is designed to be 220VDC, which ensures the suction force while also taking into account the heat dissipation of the electromagnetic coil. Since the electromagnetic coil will heat up due to the current passing through it, the resistance will increase and the current will decrease. When the temperature rise and heat dissipation of the coil reach a balance, a stable magnetic field will be obtained.

[0003] In the scrap steel suction site, in order to improve work efficiency, without changing the electromagnet coil, the voltage can only be increased. However, the heat dissipation problem of the electromagnet coil will not fundamentally improve the efficiency and may even burn out the electromagnet. Utility Model Content

[0004] The utility model aims to provide a control system for enhancing the performance of a lifting electromagnet. Without changing the internal structure of the electromagnet, the electric control system increases the working voltage of the electromagnet for the first 10 seconds to 297VDC by increasing the secondary voltage of T1, so that the electromagnet can absorb more materials, and then adjusts the voltage of the electromagnet to the normal working voltage of 220VDC to ensure that the electromagnet has sufficient suction force, thereby significantly improving the working efficiency of the electromagnet.

[0005] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: a control system for enhancing the performance of lifting electromagnets, including: an intelligent thyristor rectifier module MOD1, a resistor R1, a resistor R2, a first switch branch, and a second switch circuit;

[0006] A resistor R1 is connected between the first control terminal and the second control terminal of the intelligent thyristor rectifier module MOD1; a resistor R2 is connected between the second control terminal and the third control terminal of the intelligent thyristor rectifier module MOD1; and the resistor R2 is connected in parallel with a first switch branch and a second switch branch.

[0007] The negative terminal of the DC power supply of the intelligent thyristor module MOD1 is connected to a negative voltage and is connected to the first control terminal of the intelligent thyristor module MOD1 , and the positive terminal of the DC power supply of the intelligent thyristor module MOD1 is connected to a positive voltage.

[0008] The voltage input terminal of the intelligent thyristor module MOD1 is connected to an AC voltage.

[0009] The voltage input terminal of the intelligent thyristor module MOD1 is connected to the AC voltage through the first transformer.

[0010] The first switch branch includes an intermediate relay KA1 and a potentiometer RP1 connected in series; a normally open contact of the intermediate relay KA1 is connected in series with the potentiometer RP1.

[0011] The second switch branch includes an intermediate relay KA2; a normally open contact of the intermediate relay KA2 is connected to the second switch branch.

[0012] The coil of the intermediate relay KA1, the coil of the intermediate relay KA2 and the coil of the time relay KT1 are connected in parallel to form a parallel circuit; the coil of the intermediate relay KA1 is connected in series with the normally open contact of the time relay KT1, and the coil of the intermediate relay KA2 is connected in series with the normally closed contact of the time relay KT1.

[0013] The parallel circuit is connected to an AC power source via a second transformer.

[0014] A conversion switch SA1 is connected in series between the parallel circuit and the second transformer.

[0015] A circuit breaker is connected in series between the second transformer and the AC power supply.

[0016] The utility model has the following beneficial effects and advantages:

[0017] 1. In the present utility model, without changing the internal structure of the electromagnet, the electric control system increases the working voltage of the electromagnet to 297VDC in the first 10 seconds by increasing the secondary voltage of T1, so that the electromagnet can absorb more materials, and then adjusts the electromagnet voltage to the normal working voltage of 220VDC to ensure that the electromagnet has sufficient suction force, so that the working efficiency of the electromagnet is significantly improved.

[0018] 2. The utility model uses the conduction pin of the intelligent thyristor rectifier module MOD1 to control the output voltage thereof, thereby realizing contactless control and making the electric control system safer and simpler.

[0019] 3. The utility model can improve work efficiency and bring economic benefits to users by replacing only the electric control system without replacing the electromagnet coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] The utility model relates to a control system for enhancing the performance of a lifting electromagnet, comprising a main circuit and a control circuit. The main circuit is powered by a 380V three-phase AC voltage through a circuit breaker QF1 to a transformer T1. The 220V three-phase AC voltage output by the transformer T1 is connected to the input end of an intelligent thyristor rectifier module MOD1. The positive terminal of a DC output of the intelligent thyristor rectifier module MOD1 is connected to one end of an excitation coil YA, and the negative terminal is connected to the other end of the excitation coil YA. By using the conduction foot of the intelligent thyristor rectifier module MOD1 to control the output voltage thereof, truly contactless is realized, and the problems of easy burning of contacts and short mechanical life of a DC contactor are solved. Moreover, the working voltage of the electromagnet is increased to 297VDC in the first 10 seconds, so that the electromagnet can absorb more materials, and then the voltage of the electromagnet is adjusted to a normal working voltage of 220VDC, so that the electromagnet has sufficient suction force, and the working efficiency of the electromagnet is significantly improved. The situation that the structure of the electromagnet is not changed is perfectly solved, and the performance of the electromagnet is improved.

[0023] like Figure 1 As shown, a control system for enhancing the performance of lifting electromagnets is that the on-site power supply voltage 380VAC, 50HZ enters the circuit breaker QF1 and reaches the three-phase isolation transformer T1. After the primary voltage transformation of the transformer, the secondary voltage supplies power to the excitation circuit. The excitation circuit includes an intelligent thyristor rectifier module MOD1 and resistors R1, R2, and potentiometer RP1 connected thereto; the three-phase AC voltage passes through the intelligent rectifier module MOD1, and the intelligent thyristor rectifier module MOD1 converts the AC into DC output, and the positive pole of the output end is connected to one end of the excitation coil YA, and the negative pole of the output end is connected to the other end of the excitation coil YA.

[0024] The intelligent thyristor rectifier module MOD1 adjusts the output DC voltage by adding voltage to pins 3 and 4. The switching power supply PS1 provides working voltage to MOD1. The +12VDC voltage output by the switching power supply PS1 is connected to pins 1 and 2 of the intelligent rectifier module MOD1. The two ends of the resistor R1 are connected to pins 3 and 4 of the intelligent rectifier module MOD1 respectively. The two ends of the resistor R2 are connected in parallel with the potentiometer RP1 and are connected to pins 4 and 5 of the intelligent rectifier module MOD1 respectively. When the KA1 coil is energized, the normally open point KA1 is closed, so that the output voltage of the intelligent rectifier module MOD1 is 220VDC; when the KA2 coil is energized, the normally open point KA2 is closed, so that the output voltage of the intelligent rectifier module MOD1 is 297VDC.

[0025] The control circuit is powered by 380V AC voltage to transformer T2, and the 220V AC voltage output by the secondary of transformer T2 is connected to the coil of time relay KT1 through the connection point of suction and discharge conversion switch SA1. If the suction and discharge conversion switch SA1 is turned on, the coil of time relay KT1 is energized, and the coil of intermediate relay KA2 passing through the normally closed point of time relay KT1 is energized, and the normally open point KA2 of the intermediate relay is closed, and the lifting electromagnet is in a strong excitation state, generating a strong magnetic field to absorb more materials; when the time relay is activated after 10 seconds, the coil of intermediate relay KA1 passing through the delayed open point of time relay KT1 is energized, and the normally open point KA1 of the intermediate relay is closed, and the lifting electromagnet is in a normal excitation state, keeping the sucked materials safely sucked under the electromagnet; the suction and discharge conversion switch SA1 is disconnected, and the lifting electromagnet discharges the materials.

[0026] In this embodiment, the intelligent rectifier module MOD1 model: thyristor intelligent control module 3ZMTY320 / 380; the switching power supply PS1 model: EDR-75-12; the conversion switch adopts a knob switch; the three-phase transformer SG-△

[0027] / Y / 380V / 220V; Time relay model LADT2C.

Claims

1. A control system for enhancing the performance of a lifting electromagnet, characterized in that: include: Intelligent thyristor rectifier module MOD1, resistor R1, resistor R2, a first switch branch, and a second switch circuit; A resistor R1 is connected between the first control terminal and the second control terminal of the intelligent thyristor rectifier module MOD1; a resistor R2 is connected between the second control terminal and the third control terminal of the intelligent thyristor rectifier module MOD1; and the resistor R2 is connected in parallel with a first switch branch and a second switch branch.

2. A control system for enhancing the performance of a lifting electromagnet according to claim 1, characterized in that: The negative terminal of the DC power supply of the intelligent thyristor rectifier module MOD1 is connected to a negative voltage and is connected to the first control terminal of the intelligent thyristor rectifier module MOD1. The positive terminal of the DC power supply of the intelligent thyristor rectifier module MOD1 is connected to a positive voltage.

3. A control system for enhancing the performance of a lifting electromagnet according to claim 1, characterized in that: The voltage input terminal of the intelligent thyristor rectifier module MOD1 is connected to an AC voltage.

4. A control system for enhancing the performance of a lifting electromagnet according to claim 1, characterized in that: The voltage input terminal of the intelligent thyristor rectifier module MOD1 is connected to the AC voltage through the first transformer.

5. A control system for enhancing the performance of a lifting electromagnet according to claim 1, characterized in that: The first switch branch includes an intermediate relay KA1 and a potentiometer RP1 connected in series; a normally open contact of the intermediate relay KA1 is connected in series with the potentiometer RP1.

6. A control system for enhancing the performance of a lifting electromagnet according to claim 1, characterized in that: The second switch branch includes an intermediate relay KA2; a normally open contact of the intermediate relay KA2 is connected to the second switch branch.

7. A control system for enhancing the performance of a lifting electromagnet according to claim 5 or 6, characterized in that: The coil of the intermediate relay KA1, the coil of the intermediate relay KA2 and the coil of the time relay KT1 are connected in parallel to form a parallel circuit; the coil of the intermediate relay KA1 is connected in series with the normally open contact of the time relay KT1, and the coil of the intermediate relay KA2 is connected in series with the normally closed contact of the time relay KT1.

8. A control system for enhancing the performance of a lifting electromagnet according to claim 7, characterized in that: The parallel circuit is connected to an AC power source via a second transformer.

9. A control system for enhancing the performance of a lifting electromagnet according to claim 7, characterized in that: A conversion switch SA1 is connected in series between the parallel circuit and the second transformer.

10. A control system for enhancing the performance of a lifting electromagnet according to claim 8, characterized in that: A circuit breaker is connected in series between the second transformer and the AC power supply.

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