CN85105029A

CN85105029A - Rapidly auto-magnetizing demagnetizing apparatus controlled by scr

Info

Publication number: CN85105029A
Application number: CN 85105029
Authority: CN
Inventors: 罗固事; 杨鹤鸣
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-06-29
Filing date: 1985-06-29
Publication date: 1986-12-24

Abstract

Rapidly auto-magnetizing demagnetizing apparatus controlled by SCR mainly is to be applied on the magnechuck of surface grinding machine of field of machining, rises and fills demagnetizing effect.

At present, the automatic Apparatus for magnetising or demagnetising of the surface grinding machine of producing on each lathe both at home and abroad, all ubiquity: complex structure, cost height, demagnetization time long (10～20 seconds), functional reliability is relatively poor and shortcoming such as maintenance difficult.The brand-new rapidly auto-magnetizing demagnetizing apparatus controlled by SCR of this structure of the present invention, its characteristics are: the demagnetization time short (1～3 second), the demagnetization efficiency height, simple in structure, stable performance, cost is low, does not need debugging and easy to maintenance etc. when installing and using.

Description

Rapidly auto-magnetizing demagnetizing apparatus controlled by SCR

At present, the automatic Apparatus for magnetising or demagnetising of the surface grinding machine produced of each machine tool plant both at home and abroad, all ubiquity: cost height, shortcomings such as long (10～20 seconds) functional reliability difference of demagnetization time and maintenance difficult.At these problems, the present invention is applied to surface grinding machine with L-C-R self-excitation attenuated oscillation principle and fills in the demagnetization, succeeds in developing the brand-new rapidly auto-magnetizing demagnetizing apparatus controlled by SCR of this structure.Its characteristics are: the demagnetization time short (1～3 second), demagnetization efficiency height, simple in structure, stable performance, cost be low, do not need debugging and easy to maintenance etc. when installing and using.It compares with the automatic Apparatus for magnetising or demagnetising of the controllable silicon of the M7475B vertical shaft garden platform surface grinding machine of domestic production at present: the demagnetization time shortens 6～10 times; Number of elements reduces 53%; Cost reduces by 37.3%; Average degree of reliability improves 10 times; Power factor amount to lathe also makes moderate progress.

When magnetizing, open K switch 1, contactor C energising, the closed normally closed interlock of the normally open contact of C is opened, and controllable silicon CT and sustained diode 1 insert main circuit, demagnetization capacitor C4, C5, C6(are referring to Fig. 1) charging of forward access main circuit, simultaneously, the pulse transformer B2 of circuits for triggering exports trigger impulse, makes controllable silicon CT conducting, just have one approximate 100 volts direct current to flow through among the magnechuck XP, sucker produces magnetic field and inhales workmanship.The size of this electric current (being the size of sucker suction) can be regulated by W1 and W2.

During demagnetization, off switch K1, contactor C dead electricity, the normally open contact of C is opened normally closed interlock closure, controllable silicon CT and sustained diode 1, break away from main circuit, demagnetization capacitor C4, C5, C6 forward disconnect, and C4, C5 oppositely connect promptly to solenoid XP back discharge, produce first demagnetization pulse, capacitor C6 produces second demagnetization pulse through time-delay, and whole demagnetization process was finished in 3 seconds.The adjusting that demagnetization is strong and weak can be according to the different choice driving switch K2 of machined material.

The present invention is suitable for about 100 volts of direct voltages, on the magnechuck of the electric current 0～5A that magnetizes the magnechuck of M7340, M7350, M7475B, MB7480, surface grinding machines such as M74100, MS74100 (as 7332).

According to this principle, also design fast automatic Apparatus for magnetising or demagnetising series (no controllable silicon, circuit are Fig. 2, Fig. 3), it is applicable to that direct voltage is 100 volts or 200 volts, specified and the electric current that magnetizes of the electric current that magnetizes is less than the magnechuck of 1A, as the magnechuck of surface grinding machines such as MJ7112, MM7112, M7115, MM7115, M7116, SPM250, M7120, MM7120, MM7125, MG7125.

Claims

Rapidly auto-magnetizing demagnetizing apparatus controlled by SCR and fast automatic Apparatus for magnetising or demagnetising series are to utilize C-L-R self-excitation attenuated oscillation principle, magnechuck is advanced automatic demagnetization, thereby simplified the demagnetizer circuit widely, have shortened the demagnetization time, have improved operating efficiency.

So the scope of asking for protection is: the characteristics of filling the demagnetization means with capacitor automatically.