CN201195284Y

CN201195284Y - Grinder suction disc circuit

Info

Publication number: CN201195284Y
Application number: CNU2008200804169U
Authority: CN
Inventors: 马飞
Original assignee: Zibo Vocational Institute
Current assignee: Zibo Vocational Institute
Priority date: 2008-05-06
Filing date: 2008-05-06
Publication date: 2009-02-18
Anticipated expiration: 2018-05-06

Abstract

The utility model discloses a grinder electric magnetic chuck circuit which increases functions of multiple protection and alarm. The grinder electric magnetic chuck circuit comprises a control circuit which controls an electric motor of a grinder, a rectification circuit which is used for rectification and an operating circuit which utilizes direct current provided by the rectification circuit to cause the electric magnetic chuck to work, as well as a first protection circuit and a second protection circuit are increased to be used for cutting the control circuit and switching on an alarm circuit and sending out alarm signals when the electric magnetic chuck can not work normally. The utility model can be widely applied to grinder electric magnetic chuck circuit of various types.

Description

A kind of grinder chuck circuit

Technical field

The utility model relates to a kind of sucker circuit, relates in particular to a kind of grinder chuck circuit with warning function.

Background technology

The grinding machine magnechuck is a kind of anchor clamps that are used for fixing processing work, and it mainly acts on is to suck workpiece in process, and it is the important device that the workpiece energy is processed by safety.For preventing that fault from causing magnechuck to workpiece suction deficiency (or losing suction), the workpiece that causes accidents such as workpiece comes off, flies out to cause damages or personal injury, so must carry out safeguard protection to magnechuck.As shown in Figure 1; the magnechuck circuit mainly comprises rectification circuit, control circuit and holding circuit three parts in the prior art; general grinding machine has adopted the substance safeguard measure to magnechuck in current production; promptly only do undercurrent protection with a undercurrent relay; as shown in Figure 1; when the undercurrent fault occurring; the normally opened contact of undercurrent relay JL in time unclamps; motor place branch road disconnects; motor quits work, and does not reprocess the device on the sucker coil, plays to prevent that the accident that the device pressurized flies away from from taking place; sort circuit can play certain protective role

But state in realization in the process of undercurrent protection, the designer finds that there are the following problems at least in the prior art: the one, when the undercurrent fault occurring, if the normally opened contact JL of undercurrent relay JL can not in time unclamp again for some reason, at this moment, holding circuit will lose protective effect, the as easy as rolling off a log accident that occurs; The 2nd, when broken string (or loose contact) fault appears in the sucker coil, lack warning function in the prior art, one can not cause that the operator notes, is not easy accuracy of judgement when keeping in repair on the other hand.

The utility model content

Embodiment of the present utility model provides a kind of and can realize multiple protective and have the grinder chuck circuit of sound and light of alarm, and multiple protective can be provided when magnechuck is under-voltage, and sucker has sound and light of alarm when breaking down.

For achieving the above object, embodiment of the present utility model adopts following technical scheme:

A kind of grinder chuck circuit comprises: control circuit is used for the motor of grinding machine is controlled; Rectification circuit is used for alternating current is carried out rectification and output DC stream; Operating circuit, the DC current that utilizes described rectification circuit to provide makes magnechuck work; Described operating circuit comprises: the series circuit that magnechuck and undercurrent relay JL form; Control circuit comprises: on-off circuit and contactor control circuit, and described on-off circuit comprises: parallel circuit, the first electrothermal relay 1JR, the second electrothermal relay 2JR, the 3rd electrothermal relay 3JR that the normally opened contact JL of first fuse, undercurrent relay JL and change-over switch 2K contact are formed; First holding circuit when being used for the magnechuck cisco unity malfunction, is cut off described control circuit; Second holding circuit when being used for the magnechuck cisco unity malfunction, being cut off described control circuit and is connected alarm circuit; Alarm circuit is by the switch of control of second holding circuit and control alarm; Alarm is used to send alarm signal;

The grinder chuck circuit that the utility model embodiment provides can provide multiple protective when magnechuck is under-voltage, and sucker is when breaking down; have sound and light of alarm, improved security of products greatly, and when breaking down; easier failure judgement position, and overhaul.

Description of drawings

Fig. 1 is original grinding machine magnechuck circuit.

Fig. 2 is a magnechuck circuit of the present utility model.

The specific embodiment

Below in conjunction with accompanying drawing the utility model embodiment magnechuck circuit is described in detail.

As shown in Figure 2, described control circuit, be used for the motor of grinding machine is controlled, comprise the normally opened contact JL of first fuse, undercurrent relay JL and parallel circuit, the first electrothermal relay 1JR, the second electrothermal relay 2JR, the 3rd electrothermal relay 3JR and first, second contactor control circuit that change-over switch 2K contact is formed; Change-over switch 2K is in parallel with the normally open contact JL of undercurrent relay JL, has only the normally open contact closure of 2K or JL, the motor starting of just having ready conditions.First fuse, the first electrothermal relay 1JR, the second electrothermal relay 2JR, the 3rd electrothermal relay 3JR play a protective role, prevent accidental situation such as electric current is excessive, parallel circuit, stop button 1TA that the first contactor control circuit is made up of the contact of contactor 1JC, start button 1QA and contactor 1JC are composed in series; Parallel circuit, stop button 2TA that the second contactor control circuit is made up of the contact of contactor 2JC, start button 2QA and contactor 2JC are composed in series, the coil of JL is connected in the magnechuck work loop, have only when magnechuck gets electric work, the JL coil just obtains electric adhesive, JL normally open contact closure.Press start button 1QA and 2QA this moment, makes contactor 1JC and JC2 coil obtain electric adhesive, and control circuit is communicated with, and main circuit could turn round.

Rectification circuit is used for alternating current is carried out rectification and output DC stream confession sucker coil working, and first holding circuit comprises the first relay K A1, the first divider resistance R1 and the first slide-wire rheostat RW1 and the first diode D1; The first relay K A1, the first divider resistance R1 and the first slide-wire rheostat RW1 form series circuit, the described first relay K A1 is in parallel with the first diode D1, the positive pole of one termination the 3rd diode D3 of described first holding circuit, link to each other with described operating circuit one end by the 3rd diode D3, the other end of described first holding circuit links to each other with the other end of described operating circuit; Described contact JL in the normally opened contact KA1 of the first relay K A1 and the described on-off circuit is in series.

As shown in Figure 2; ADD partly is first holding circuit and second holding circuit among the figure; aforesaid first holding circuit comprises that the first relay K A1 and the first divider resistance R1, the first slide-wire rheostat Rw1 branch road constitute sucker and lose (owing) voltage protection circuit; sealing in of the first slide-wire rheostat Rw1 is that sucker suction is in allowed band in order to ensure in the voltage range of the first relay K A1 closure.If the AB both end voltage is normal, the normally opened contact closure of the first relay K A1 is for the startup of motor is got ready; If AB two ends no-voltage (or the voltage reduction, become halfwave rectifier for some reason as full-wave rectification) time, the normally opened contact of the first relay K A1 disconnects, the outage of Electric Machine Control branch road, and motor is shut down, and has reached mistake (owing) and has pressed protective effect

Second holding circuit comprises: the second divider resistance R2, the second slide-wire rheostat RW2, coupler, triode T, the second relay K A2, the 3rd slide-wire rheostat RW3 and the second diode D2;

The first relay K A1, the second relay K A2 elect the DC relay of same model as, and contact current is less than (AC220V) 5A, and coil rating voltage is 12V.Parallel circuit is formed with described first holding circuit in the described second divider resistance R2, second slide-wire rheostat RW2 series connection back; The first divider resistance R1 elects identical resistance as with the second dividing potential drop R2, and the second slide-wire rheostat Rw2 selects about 20k Ω, and its value is adjusted in side circuit: just often do not report to the police, reporting to the police during the sucker fault gets final product.In the coupler input pin, the negative sense pin is connected between described second divider resistance R2 and the described second slide-wire rheostat RW2, the forward pin is connected between described undercurrent relay coil JL and the described sucker coil, one of described coupler output pin links to each other with the base stage of triode T, and another pin of output links to each other with the 3rd slide-wire rheostat RW3 one end and inserts described operating circuit by described the 3rd slide rheostat RW3; Photo-coupler is elected GD325 as, and the 3rd slide-wire rheostat Rw3 is taken as about 100k Ω.

Described triode T colelctor electrode links to each other with the positive pole of the described second relay K A2 and the second diode D2, and described triode T launching base connects the anodal of the 3rd diode D3 and passes through the 3rd diode D3 cut-in operation circuit; Triode T elects switching tube as, and its collection emitter-base bandgap grading working inverse voltage is not less than 2 times operating circuit operating voltage.

The described second relay K A2 is in parallel with the second diode D2, and negative pole one end of the described second diode D2 is connected with described the 3rd slide rheostat RW3 sliding end binding post; Diode D1, D2, D3 are commutation diode of the same type.Its backward voltage is not less than 2 times operating circuit operating voltage.

The normally opened contact KA1 of the normally-closed contact KA21 of the described second relay K A2 and described normally opened contact JL, the described first relay K A1 is in series; The normally opened contact KA22 of the described second relay K A2 is connected in the described alarm circuit; It is the little electric bell of 220V that electric bell DL selects operating voltage, and it is the red bulb of 220V that signal lamp LA selects operating voltage.

Second holding circuit of above-mentioned setting and alarm circuit make the sucker circuit increase duplicate protection and sound and light of alarm.As if working properly, during the numerical value of a certain prior setting of coupler input both end voltage in second holding circuit, as 0.9 volt, photoelectrical coupler ends, and triode T also ends.The second relay K A2 coil no power, its normally-closed contact KA21 closure, ready for the startup of motor, its normally opened contact KA22 disconnects, and electric bell DL does not ring, and alarm lamp LA does not work; If the sucker coil disconnects (or loose contact), coupler input both end voltage U in second holding circuit〉0.9V, the optical coupler conducting, the triode saturation conduction, the second relay K A2 coil obtains, its normally-closed contact KA21 disconnects, and the Electric Machine Control branch road cuts off the power supply and motor is shut down, and has reached protective effect; While normally opened contact KA22 closure, electric bell DL rings, and signal lamp LA is bright, plays the function of sound and light alarm.

In the foregoing circuit, the optical coupler output current is less, and triode T comes amplified current to use as driving element, and the protective effect of undercurrent relay JL is the same with primary circuit.

Holding circuit that increases newly and warning circuit have been realized workpiece only under situation about being held by magnechuck YH, and emery wheel and workbench just can carry out grinding; played the triple protection effect; fully guaranteed safety, and made when sucker breaks down, the position of easier failure judgement.

The above; it only is the specific embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion by described protection domain with claim.

Claims

1. grinding machine magnechuck circuit comprises:

Control circuit, be used for the main circuit of grinding machine is controlled, comprise on-off circuit and contactor control circuit, described on-off circuit comprises the normally opened contact of first fuse, undercurrent relay and parallel circuit, first electrothermal relay, second electrothermal relay, the 3rd electrothermal relay that the change-over switch contact is formed;

Rectification circuit is used for alternating current is carried out rectification and output DC stream;

Operating circuit comprises the series circuit that magnechuck and undercurrent relay are formed, and the DC current that utilizes described rectification circuit to provide makes magnechuck work;

It is characterized in that,

First holding circuit when being used for the magnechuck cisco unity malfunction, is cut off described control circuit;

Second holding circuit when being used for the magnechuck cisco unity malfunction, being cut off described control circuit and is connected alarm circuit;

Alarm circuit is by the switch of control of second holding circuit and control alarm;

Alarm is used to send alarm signal.

2. according to the grinding machine magnechuck circuit of claim 1, it is characterized in that,

Described first holding circuit comprises first relay, first divider resistance, first slide-wire rheostat and first diode;

Described first relay, divider resistance and first slide-wire rheostat are formed series circuit, described first relay is in parallel with first diode, the positive pole of one termination the 3rd diode of described first holding circuit, link to each other with described operating circuit one end by the 3rd diode, the other end of described first holding circuit links to each other with the other end of described operating circuit;

Described contact in the normally opened contact of described first relay and the described on-off circuit is in series.

3. according to the grinding machine magnechuck circuit of claim 2, it is characterized in that described second holding circuit comprises:

Second divider resistance, second slide-wire rheostat, coupler, triode, second relay, the 3rd slide-wire rheostat and second diode;

Parallel circuit is formed with described first holding circuit in described second divider resistance, second slide-wire rheostat series connection back;

In the described coupler input pin, the negative sense pin is connected between described second divider resistance and described second slide-wire rheostat, the forward pin is connected between described undercurrent relay coil and the described sucker coil, one of described coupler output pin links to each other with the base stage of triode, and another pin of output links to each other with the 3rd slide-wire rheostat one end and inserts described operating circuit by described the 3rd slide rheostat;

Described transistor collector links to each other with the positive pole of described second relay and second diode, and described triode launching base connects the anodal of the 3rd diode and passes through the 3rd diode cut-in operation circuit;

Described second relay is in parallel with second diode, and negative pole one end of described second diode is connected with described the 3rd slide rheostat sliding end binding post;

The normally opened contact of the normally-closed contact of described second relay and described normally opened contact, described first relay is in series; The normally opened contact of described second relay is connected in the described alarm circuit.

4. according to the grinding machine magnechuck circuit of claim 1, it is characterized in that described alarm circuit is:

First alarm is in parallel with second alarm, forms with the normally opened contact of described second relay then and connects, and is connected on the two ends of main circuit by first fuse;

Described first alarm is an electric bell;

Described second alarm is a signal lamp.