CN207953577U - A kind of power supply device of grinding machine - Google Patents

Abstract

The utility model is related to grinding machine manufacture field, spy is related to a kind of power supply device of grinding machine.The three-phase and four-line supply line of the utility model is separately connected magnetising or demagnetising apparatus and multiple contactors.Wherein first contactor connects grinding wheel motor, and magnetising or demagnetising apparatus includes undercurrent relay, and normally closed node one end of undercurrent relay is connect with direct current 24V, and the normally closed node other end after button K with first contactor KM1 coils with 24V ground wires by connecting.The utility model by increase undercurrent relay control grinding wheel motor start and stop, avoid workpiece fly up injure by a crashing object equipment and personnel accident occur.

Description

A kind of power supply device of grinding machine

Technical field

The utility model is related to grinding machine manufacture field, spy is related to a kind of power supply device of grinding machine.

Background technology

When the grinding machine workpieces processing of the prior art, magnetic-adsorption workpiece is used to be processed (this process for magnetize), processing It demagnetizes after the completion, removes workpiece.But in process, in fact it could happen that the electric current in magnetising or demagnetising apparatus in electromagnetic coil declines The case where, so as to cause workpiece, there is no securely absorption；Or due to operating personnel's operation error, in no startup magnetising or demagnetising apparatus In the case of be processed, such workpiece is in the processing of grinding wheel motor, due to no fixed stably, is easy to fly out from grinding machine Come, to cause casualty accident.Meanwhile existing apparatus, there is also causing demagnetization to be not thorough, workpiece cannot be removed smoothly.

Utility model content

In view of the deficiencies of the prior art, the utility model provides a kind of power supply device of grinding machine.The utility model Grinding wheel motor is connected by first contactor, the undercurrent relay in demagnetizer controls first contactor, to real Showing the control to motor power, when making low pressure low current or operating personnel's maloperation, grinding wheel motor can be shut down in time, Ensure the safety of processing staff, and the utility model can realize complete demagnetization.

The technical solution of the utility model is：A kind of power supply device of grinding machine, including three-phase and four-line supply line, three Four line supply line of phase is separately connected magnetising or demagnetising apparatus and first contactor, and first contactor connects grinding wheel motor, feature It is：Magnetising or demagnetising apparatus includes pressure regulation device, biphase rectification circuit, undercurrent relay, time delay discharge circuit and electromagnetic coil, Undercurrent relay is connected between biphase rectification circuit and time delay discharge circuit, pressure regulation device include three power inputs and Two power output ends connect zero curve at pressure regulation device midpoint, and three power inputs are respectively the first phase by switching switch Power input, the second phase power input and third phase power input；Including the first single-phase transformer and the second single-phase change One terminal of depressor, the first single-phase transformer first winding is connected with the first phase power input, another terminal and second The midpoint of single-phase transformer first winding is connected, two terminals of the second single-phase transformer first winding respectively with the second phase power supply Input terminal is connected with third phase power input；The secondary winding of first single-phase transformer and the second single-phase transformer it is secondary around Group is connected in series between two power output ends, and two power output ends are defeated by undercurrent relay and biphase rectification circuit Access point connects；Biphase rectification circuit is made of four groups of thyristor groups, and four groups of thyristor groups constitute bridge circuit, each group of brake tube group Include the thyristor of two mutual reversal connections, the output end difference time delay discharge circuit in parallel and electromagnetic coil of biphase rectification circuit； Normally closed node one end of undercurrent relay is connect with direct current 24V, and the normally closed node other end after button with first by contacting Device coil is connect with 24V ground wires.

According to the power supply device of grinding machine as described above, it is characterised in that：The time delay discharge circuit includes electricity Resistance, capacitance, the first diode, the second diode, wherein resistance are connect with the second diode cathode, the second diode cathode difference With the first diode cathode and capacitance connection.

According to the power supply device of grinding machine as described above, it is characterised in that：Further include control system, control system is used In closure or the disconnection of control switching switch and thyristor.

The utility model has the beneficial effects that：First, magnetising or demagnetising apparatus uses three phase voltage regulating device, make magnetising or demagnetising apparatus work Make electric current more to stablize, it is ensured that workpiece is by solid and reliable absorption；Second is that controlling grinding wheel electricity by increasing undercurrent relay The start and stop of motivation, avoid workpiece fly up injure by a crashing object equipment and personnel accident occur；Third, being put into practice by pressure regulation device gradual Decompression demagnetization realizes demagnetization completely to accurately control the demagnetization time.

Description of the drawings

Fig. 1 is the electrical block diagram of the utility model.

Reference sign：A, B, C are respectively the triple line of input voltage, and N is zero curve, and midpoint D, K1 are that A phases switch out It closes, K2 is that B phases switch switch, and K3 is that C phases switch switch, and VT1, VT5 are the first thyristor groups；VT2, VT6 are the second thyristor Group；VT3, VT7 are third thyristor groups；VT4, VT8 are the 4th thyristor groups；A, b, c, d are low-pressure side output voltage point, and R is Resistance, C are capacitance, D1 be the first diode D2 be the second diode, YA is electromagnetic coil, pressure regulation device 1, time delay discharge circuit 2, biphase rectification circuit 3, first contactor KM1, second contactor KM2, third contactor KM3, button K, undercurrent relay KA。

Specific implementation mode

The technical solution of the utility model is described further below in conjunction with attached drawing.

As shown in Figure 1, the power supply device of the grinding machine of the utility model includes three-phase and four-line supply line, three-phase and four-line Supply line is separately connected magnetising or demagnetising apparatus and multiple contactors, if the utility model includes 3 contactors, respectively first Contactor KM1, second contactor KM2, third contactor KM3, second contactor KM2, third contactor KM3 can be to other equipments It is powered, such as digital driving mechanism, Oil pump electrical machinery.Wherein first contactor KM1 connections grinding wheel motor M1 fills demagnetization dress It sets including undercurrent relay KA, normally closed node one end of undercurrent relay KA is connect with direct current 24V, the normally closed node other end By being connect with first contactor KM1 coils with 24V ground wires after button K, in this way, only when undercurrent relay KA is operated in When normal circuit, normally closed node is closed, and grinding wheel motor M1 is likely to start, and even if occurs undertension situation in operation Under, normally closed node can be opened in time, keep grinding wheel motor M1 out of service.When may insure the M1 work of grinding wheel motor in this way, Electric current is sufficiently large in electromagnetic coil YA, makes in process, and workpieces processing can be adsorbed firmly by magnetising or demagnetising apparatus, will not There is workpieces processing to fly out the accident hurted sb.'s feelings.

As shown in Figure 1, the magnetising or demagnetising apparatus of the grinding machine of the utility model includes pressure regulation device 1, biphase rectification circuit 3, owes Electric current relay KA, time delay discharge circuit 2 and electromagnetic coil YA, wherein 1 rear portion of pressure regulation device connect biphase rectification circuit 3, owe Electric current relay KA is connected between biphase rectification circuit 3 and time delay discharge circuit 2, and 2 rear portion of time delay discharge circuit connects electromagnetism Coil YA.

As shown in Figure 1, the pressure regulation device 1 of magnetising or demagnetising apparatus includes that three power inputs (A, B and C) and two power supplys are defeated Outlet (a and d), in 1 midpoint D connection zero curves N of pressure regulation device, three power inputs are respectively the first phase power input A, Two-phase power input B and third phase power input C；The utility model includes the first single-phase transformer (corresponding to ADab Transformer) and the second single-phase transformer (transformer corresponding to BCbdc), wherein the one of the first single-phase transformer first winding A terminal is connected with the first phase power input A, another terminal is connected with the midpoint D of the second single-phase transformer first winding, Two terminals of the second single-phase transformer first winding respectively with the second phase power input B and third phase power input C phases Even, be formed as the first phase winding AD (i.e. A phase windings) to the first winding of the first single-phase transformer, the second single-phase transformer First winding is formed as the second phase winding BD (i.e. B phase windings) and third phase winding CD (i.e. C phase windings).

As shown in Figure 1, the secondary winding of first single-phase transformer of the utility model and the second single-phase transformer is secondary Windings in series (being connected in series with c, b connection a little seen in Fig. 1) is connected between two power output ends a, d, in the utility model, After a points and d points series connection undercurrent relay KA with connect 3 input point of biphase rectification circuit.Undercurrent relay KA settings exist Have the advantages that sampling is the most accurate herein, for example, if being located at undercurrent relay KA in a certain phase or two-phase, On factory process line, the startup of single device be easy to cause the decline of individual event voltage, to make individual event electric current decline, but this practicality It is novel due to using three phase voltage regulating device 1, the electric current in electromagnetic coil YA can't change, therefore workpiece is still by electromagnetic coil YA It is sucked, grinding wheel motor M1 can be worked normally.Undercurrent relay KA settings herein, being capable of accurate response electromagnetic coil YA electricity The variation of stream, and then it can be accurately controlled starting or stoping for grinding wheel motor M1, maloperation is prevented, and may insure to operate The safety of personnel and equipment.

As described in Figure 1, the biphase rectification circuit 3 of the utility model is made of four groups of thyristor groups, four groups of thyristor groups structures At bridge circuit, including the first thyristor groups (VT1, VT5), the second thyristor groups (VT2, VT6), third thyristor groups (VT3, VT7), the 4th thyristor groups (VT4, VT8)；Each group of brake tube group includes the thyristor of two mutual reversal connections, biphase rectification circuit 3 Output end time delay discharge circuit 2 in parallel and electromagnetic coil YA respectively.As shown in Figure 1, the time delay discharge circuit 2 of the utility model Including resistance R, capacitance C, the first diode D1, the second diode D2, wherein resistance R is connect with the second diode D2 anodes, the Two diode D2 cathode are connect with the first diode D1 anodes and capacitance C respectively.

The utility model can also include control system, and control system is for controlling switching switch K1, K2, K3 and brilliant lock The closure of pipe or disconnection.

Utility model works process is：When grinding machine magnetizes, control system control switching switch K1, K2, K3 first is closed, Thyristor (VT1, VT2, VT3, VT4) is connected, and thyristor (VT5, VT6, VT7, VT8) cut-off, such electromagnetic coil YA electric currents increase Add, realization magnetizes to grinding machine.When grinding machine normally magnetizes or keeps magnetic force, undercurrent relay KA electric currents are normal, normally closed node It is closed, grinding wheel motor M1 normal works.When undercurrent relay KA current reductions, electric current in electromagnetic coil YA also under Drop, workpiece is possible to be not sucked firmly at this time, and normally closed node automatically opens, and grinding wheel motor M1 shuts down, and workpiece is not It can fly out because of the rotation of grinding wheel motor, it is ensured that the safety of operating personnel and equipment.When needing demagnetization, control system Thyristor (VT1, VT2, VT3, VT4) is set to end, thyristor (VT5, VT6, VT7, VT8) conducting, load is in electromagnetic coil in this way The voltage both ends positive and negative anodes of YA change, and realize demagnetization, during the utility model demagnetization, can gradually close section switching switch K3, K2, K1 make demagnetization voltage gradually decrease.Input terminal due to the utility model in pressure regulation device 1 is controlled, without logical It crosses switching thyristor and carries out voltage adjusting, therefore every grade of demagnetization time can be accurately controlled, precision is 0.01 second, and 3 switchings are opened It closes and three-level demagnetization can be achieved, the moment, it can be achieved that when voltage is zero is controlled by the field adjustable of equipment, just stops moving back Magnetic realizes demagnetization completely.Secondly, the resistance R in the utility model time delay discharge circuit 2 can consume electricity during demagnetization The energy consumption of magnetic coil YA, it is ensured that circuit safety, capacitance C, the first diode D1, the second diode D2 can make stopping magnetize beginning After demagnetization, keep the demagnetization voltage for starting to apply higher, the voltage that then demagnetizes continuously decreases voltage.

Claims (3)

1. a kind of power supply device of grinding machine, including three-phase and four-line supply line, three-phase and four-line supply line, which is separately connected, fills Demagnetizer and first contactor, first contactor connect grinding wheel motor, it is characterised in that：Magnetising or demagnetising apparatus includes pressure regulator Part, biphase rectification circuit, undercurrent relay, time delay discharge circuit and electromagnetic coil, undercurrent relay are connected on two-way whole Between current circuit and time delay discharge circuit, pressure regulation device includes three power inputs and two power output ends, in pressure regulator Part midpoint connects zero curve, and three power inputs are defeated by switching switch respectively the first phase power input, the second phase power supply Enter end and third phase power input；Including the first single-phase transformer and the second single-phase transformer, the first single-phase transformer is primary One terminal of winding is connected with the first phase power input, the midpoint of another terminal and the second single-phase transformer first winding Be connected, two terminals of the second single-phase transformer first winding respectively with the second phase power input and third phase power input It is connected；The secondary winding of first single-phase transformer and the secondary windings in series of the second single-phase transformer are connected to two power supplys and export Between end, two power output ends are connect by undercurrent relay with biphase rectification circuit input point；Biphase rectification circuit by Four groups of thyristor groups compositions, four groups of thyristor groups constitute bridge circuit, and each group of brake tube group includes the brilliant lock of two mutual reversal connections Pipe, the output end difference time delay discharge circuit in parallel and electromagnetic coil of biphase rectification circuit；The normally closed node of undercurrent relay One end is connect with direct current 24V, and the normally closed node other end after button with first contactor coil with 24V ground wires by connecting.

2. the power supply device of grinding machine according to claim 1, it is characterised in that：The time delay discharge circuit includes Resistance, capacitance, the first diode, the second diode, wherein resistance are connect with the second diode cathode, the second diode cathode point Not with the first diode cathode and capacitance connection.

3. the power supply device of grinding machine according to claim 1, it is characterised in that：Further include control system, control system Closure or disconnection of the system for controlling switching switch and thyristor.