CN114083071A

CN114083071A - Electrode wire conveying device for wire cut electrical discharge machining equipment

Info

Publication number: CN114083071A
Application number: CN202111632565.8A
Authority: CN
Inventors: 魏凯凤
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-02-25

Abstract

The invention discloses an electrode wire conveying device for wire cut electric discharge machining equipment, which comprises a supporting plate, wherein a guide wheel is rotatably arranged on the supporting plate, a rail frame is fixedly connected to the side wall of the supporting plate, a containing groove is formed in the side wall of the rail frame, a plurality of driving grooves are formed in the side wall of the rail frame, telescopic air bags are fixedly connected to the inner walls of the driving grooves, two ends of each telescopic air bag are respectively communicated with an air inlet pipe and an air outlet pipe, and one-way valves are respectively arranged in the air inlet pipe and the air outlet pipes. By arranging the telescopic air bags, the air inlet pipe, the air outlet pipe and the telescopic device, when a certain part of the electrode wire is too tensioned and is about to be broken, the telescopic air bags adjacent to the certain part can be continuously stretched under the action of the telescopic device and generate negative pressure air flow, so that when the electrode wire is cracked, the cracked electrode wire can be absorbed to one side of the accommodating groove by the negative pressure air flow, and the electrode wire can be prevented from being thrown outwards to damage workpieces or workers.

Description

Electrode wire conveying device for wire cut electrical discharge machining equipment

Technical Field

The invention relates to the technical field of machining, in particular to an electrode wire conveying device for wire cut electric discharge machining equipment.

Background

The wire cut electrical discharge machining is mainly characterized in that high-frequency pulse current is introduced into a wire electrode, the wire electrode is circularly moved through a conveying assembly, and the wire electrode can continuously generate an electroerosion effect of electric sparks on a workpiece, so that the workpiece is cut and machined.

Due to the influence of factors such as quality difference of the electrode wire and overlarge input current, the electrode wire is easy to break in the processing process. In order to solve the problem, the application number '201610932513.5' proposes a 'wire electrode conveying frame for a wire electric discharge machine', which mainly comprises that when a wire electrode is broken, a vertical pressing block presses down and abuts against a wire breaking inductor, the inductor is connected with a control circuit, and the control circuit gives an instruction of stopping the operation of the cutting device. According to the scheme, the condition of breakage of the electrode wire can not be predicted, the cutting device can be paused only when the electrode wire is broken, the tightened electrode wire is easy to throw away outwards under the action of self tension when the electrode wire is broken, the temperature of the electrode wire is extremely high, the workpiece surface is easy to be damaged, and the damage to surrounding workers can be caused when the temperature of the electrode wire is serious. In view of this, the present document proposes an electrode wire feeding device for a wire electric discharge machine.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides an electrode wire conveying device for wire cut electric discharge machining equipment.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an electric spark wire cutting is electrode wire conveyor for equipment, includes the backup pad, it is equipped with the leading wheel to rotate in the backup pad, fixedly connected with rack on the lateral wall of backup pad, the groove has been seted up and has been accomodate to the lateral wall of rack, a plurality of driving grooves have been seted up on the lateral wall of rack, fixedly connected with flexible gasbag on the driving groove inner wall, flexible gasbag's both ends communicate respectively has intake pipe and outlet duct, just all install the check valve in intake pipe and the outlet duct, install the telescoping device that makes flexible gasbag flexible in the driving groove.

Preferably, the telescoping device is including inlaying the magnetic ring of establishing on the drive inslot wall, the embedded mutual inductor that is equipped with of flexible gasbag, install on the magnetic ring and carry out spacing stop gear to flexible gasbag flexible range.

Preferably, the limiting mechanism comprises a conductive spring fixedly connected to the inner wall of the driving groove, a limiting ring is fixedly connected to one end, close to the magnetic ring, of the conductive spring, and the mutual inductor is electrically connected with the conductive spring.

Preferably, a piezoelectric piece is mounted on the side wall of the magnetic ring, a plurality of warning lamps are mounted on the side wall of the rail frame, and the piezoelectric piece is electrically connected with the adjacent warning lamps.

Preferably, a tensioning frame penetrates through the supporting plate, the upper end of the supporting plate is rotatably connected with an adjusting screw rod in threaded connection with the tensioning frame, and a tensioning wheel is rotatably arranged on the tensioning frame.

The invention has the following beneficial effects:

1. by arranging the telescopic air bags, the air inlet pipe, the air outlet pipe and the telescopic device, when a certain part of the electrode wire is too tensioned and is about to be broken, the telescopic air bags adjacent to the certain part can be continuously stretched under the action of the telescopic device and continuously generate negative pressure airflow under the action of unidirectional flow limiting of the one-way valves in the air inlet pipe and the air outlet pipe, so that when the electrode wire is cracked, the cracked electrode wire can be absorbed to one side of the accommodating groove by the negative pressure airflow, and the electrode wire can be prevented from being thrown out outwards to damage workpieces or workers;

2. through setting up stop gear, piezoelectric patches and warning light, can refine impaired messenger when wire electrode somewhere is too taut, then the piezoelectric patches vibration produces the electric current under the piezoelectric effect, and then makes adjacent warning light circular telegram light to in time inform the staff and shut down and change the wire electrode, prevent that the wire electrode bursts apart and loses the work piece or injure the people.

Drawings

Fig. 1 is a schematic structural view of an electrode wire conveying device for a wire-cut electric discharge machine according to the present invention;

FIG. 2 is an enlarged view of the structure at A in the present invention;

FIG. 3 is a schematic diagram of a wire electrode with a damaged current passing through a portion and a mutual inductor;

in the figure: the device comprises a supporting plate 1, a guide wheel 2, a tensioning frame 3, a tensioning wheel 4, an adjusting screw rod 5, a wire electrode 6, a rail frame 7, a storage groove 8, a driving groove 9, a warning lamp 10, a telescopic air bag 11, a mutual inductance coil 12, an air inlet pipe 13, an air outlet pipe 14, a magnetic ring 15, a piezoelectric sheet 16, a limiting ring 17 and a conductive spring 18.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-3, an electrode wire conveying device for wire cut electric discharge machining equipment comprises a supporting plate 1, wherein a guide wheel 2 is arranged on the supporting plate 1 in a rotating mode, a tensioning frame 3 penetrates through the supporting plate 1, an adjusting screw rod 5 in threaded connection with the tensioning frame 3 is connected to the upper end of the supporting plate 1 in a rotating mode, and a tensioning wheel 4 is arranged on the tensioning frame 3 in a rotating mode. The tensioning frame 3 in threaded connection with the adjusting screw rod 5 can be moved up and down by rotating the adjusting screw rod, and the tension degree of the electrode wire 6 is adjusted by adjusting the position of the tensioning wheel 4.

The side wall of the supporting plate 1 is fixedly connected with a rail frame 7, and specifically, the shape of the rail frame 7 is approximately the same as the wire traveling path of the wire electrode 6.

Accomodate groove 8 has been seted up to the lateral wall of rack 7, a plurality of driving grooves 9 have been seted up on the lateral wall of rack 7, fixedly connected with flexible gasbag 11 on the driving groove 9 inner wall, flexible gasbag 11's both ends communicate respectively has intake pipe 13 and outlet duct 14, and all install the check valve in intake pipe 13 and the outlet duct 14, and is specific, the check valve restriction air of intake pipe 13 can only follow intake pipe 13 flow direction flexible gasbag 11, and the check valve restriction air of outlet duct 14 can only follow flexible gasbag 11 and flow to outlet duct 14, consequently when flexible gasbag 11 is flexible, sustainable has intake pipe 13 to inhale the air, discharge from outlet duct 14 again, install the telescoping device who makes flexible gasbag 11 flexible in the driving groove 9.

The telescoping device is including inlaying the magnetic ring 15 of establishing on the drive groove 9 inner wall, and the embedded mutual inductor 12 that is equipped with of flexible gasbag 11 installs on the magnetic ring 15 and carries out spacing stop gear to flexible scope of flexible gasbag 11, and stop gear includes conductive spring 18 of fixed connection on the drive groove 9 inner wall, and conductive spring 18 is close to the one end fixedly connected with spacing ring 17 of magnetic ring 15, mutual inductor 12 and conductive spring 18 electric connection. It should be noted that, the mutual inductance coil 12 is made of iron alloy, when the mutual inductance coil 12 is powered off, the magnetic ring 15 attracts the mutual inductance coil 12 to approach to it, and when the mutual inductance coil 12 is powered on, the magnetic field generated after the mutual inductance coil 12 is powered on is made to repel the magnetic ring 15 by controlling the current direction transmitted to the electrode wire 6, so that when the mutual inductance coil 12 is periodically powered on and powered off, the telescopic airbag 11 can be continuously stretched, and the power-on and power-off frequency of the mutual inductance coil 12 is consistent with the current pulse frequency transmitted to the electrode wire 6, so that the telescopic airbag 11 can be stretched in high frequency, so as to generate strong negative pressure airflow at the air inlet pipe 13, thereby sucking the electrode wire 6 after crack to the receiving groove 8 side.

The side wall of the magnetic ring 15 is provided with a piezoelectric sheet 16, the side wall of the rail frame 7 is provided with a plurality of warning lamps 10, and the piezoelectric sheet 16 is electrically connected with the adjacent warning lamps 10. It should be noted that, by providing a plurality of warning lamps 10 and piezoelectric sheets 16, if a certain part of the wire electrode 6 is about to break, the piezoelectric sheets 16 at adjacent positions will turn on the corresponding warning lamps 10, and at this time, the worker can be notified to replace the wire electrode 6 in time, so as to prevent a greater dangerous accident from occurring, and in addition, when observing that the warning lamps 10 are turned on, the worker can stop the wire electrode 6 from running first, continuously supply power to the wire electrode 6 in a pulse manner, and can find the damaged position of the wire electrode 6 through the position where the warning lamps 10 are turned on.

In the use process of the device, the guide wheel 2 can lead the wire electrode 6 to circularly move when rotating, and meanwhile, the wire cutting equipment continuously leads high-frequency pulse current to the wire electrode 6. If the wire electrode 6 is in a good state, the diameters of the wire electrode 6 are almost different, so that the current of the wire electrode 6 is almost the same, and if the wire electrode 6 is cracked at a certain position, the diameter of the wire electrode 6 is necessarily thinned due to the overlarge tension, the cross section of the wire electrode 6 is smaller as the diameter is smaller, and the resistance of the wire electrode is increased as the conductivity of the metal is not difficult to know, so that the current passing through the wire electrode is also reduced.

The wire electrode 6 is continuously fed with high-frequency pulse current, a magnetic field is also excited around the wire electrode 6 under the action of the magnetic effect of the current, and the generated magnetic field is also an alternating magnetic field because the current is in a high-frequency pulse form, namely the fed current is in an intermittent section form, and the magnitude of the current is changed from zero to a peak value all the time, and each mutual inductance coil 12 under the alternating magnetic field generates induced current due to mutual inductance. The good part of the wire electrode 6 has a larger diameter and a larger cross-sectional area, and the passing current is also larger, so the generated alternating magnetic field intensity is also larger, and therefore the mutual induction coil 12 adjacent to the good part also excites a larger induced current, and the passing current is smaller, the generated large alternating magnetic field intensity is also smaller, so the mutual induction coil 12 adjacent to the good part also excites a smaller induced current.

Meanwhile, the induced current generated by the mutual inductor 12 is introduced into the conductive spring 18, if the induced current is large, the conductive spring 18 can overcome the elastic force of the conductive spring 18 after being electrified and contract, the limit ring 17 can be pulled to be abutted against the telescopic air bag 11, and the telescopic air bag 11 can be limited at the moment; if the induced current generated by the mutual inductor 12 is small, the conductive spring 18 cannot contract against the elastic force of the conductive spring 18 after being electrified, and at the moment, the conductive spring 18 is in an extension state and pushes the limit ring 17 to be far away from the telescopic airbag 11, so that the limit of the telescopic airbag 11 is released.

After the limit of the telescopic airbag 11 is released, the mutual inductor 12 generates magnetic force and is mutually exclusive with the magnetic ring 15 after being electrified, and pulls the telescopic airbag 11 to contract, further, as can be seen from the above, since the current electrified by the wire electrode 6 changes from zero to the peak value, the magnetic field intensity generated by the wire electrode also changes from zero to the peak value, the induced current excited by the mutual inductor 12 also changes from zero to the peak value, so the mutual inductor 12 is periodically electrified and deenergized, when the mutual inductor 12 is deenergized, the magnetic ring 15 approaches to the mutual inductor 12 which attracts the iron, and thus the telescopic airbag 11 can be driven to extend. Therefore, during the periodic power on/off process of the mutual inductor 12, the telescopic airbag 11 continuously expands and contracts, and air is continuously sucked in from the air inlet pipe 13 and discharged from the air outlet pipe 14 under the action of the one-way valve, so that negative pressure is continuously generated on one side of the accommodating groove 8.

To sum up, if a crack is to be generated at a certain position of the wire electrode 6, the wire electrode is firstly thinned, as the wire electrode 6 continuously runs, when the thinned part of the wire electrode 6, which is fed with high-frequency pulse current, passes through each mutual inductor 12, because the current of the mutual inductor 12 at the position excited by mutual inductance is small, the limiting ring 17 at the position releases the limit of the telescopic airbag 11, the telescopic airbag 11 adjacent to the thinned part of the wire electrode 6 continuously expands and contracts and continuously impacts the piezoelectric sheet 16 on the magnetic ring 15, under the piezoelectric effect, the piezoelectric sheet 16 enables the adjacent warning lamp 10 to be powered on and give out light to warn so as to inform the operator to stop the machine for replacing the wire electrode 6 in time, and if the operator breaks before replacing the wire electrode 6, the telescopic airbag 11 adjacent to the thinned part of the wire electrode 6 continuously contracts and can continuously generate negative pressure on the air inlet pipe 13 side, and the wire electrode 6 cracks at the thinned part, the broken wire electrode 6 is attracted by the negative pressure air flow and is absorbed to the direction of the accommodating groove 8, so that the wire electrode 6 can be prevented from being thrown outwards to damage workpieces or workers.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides an electric spark wire cutting is electrode wire conveyor for equipment, includes backup pad (1), it is equipped with leading wheel (2) to rotate in backup pad (1), a serial communication port, fixedly connected with rack (7) on the lateral wall of backup pad (1), groove (8) have been seted up to the lateral wall of rack (7), a plurality of driving grooves (9) have been seted up on the lateral wall of rack (7), fixedly connected with flexible gasbag (11) on driving groove (9) inner wall, the both ends of flexible gasbag (11) communicate respectively has intake pipe (13) and outlet duct (14), just all install the check valve in intake pipe (13) and outlet duct (14), install the telescoping device that makes flexible gasbag (11) flexible in driving groove (9).

2. The electrode wire conveying device for the wire cut electric discharge machine according to claim 1, wherein the telescopic device comprises a magnetic ring (15) embedded on the inner wall of the driving groove (9), a mutual inductor (12) is embedded in the telescopic air bag (11), and a limiting mechanism for limiting the telescopic amplitude of the telescopic air bag (11) is mounted on the magnetic ring (15).

3. The electrode wire conveying device for the wire cut electric discharge machine according to claim 2, wherein the limiting mechanism comprises a conductive spring (18) fixedly connected to the inner wall of the driving groove (9), a limiting ring (17) is fixedly connected to one end of the conductive spring (18) close to the magnetic ring (15), and the mutual coil (12) is electrically connected with the conductive spring (18).

4. The electrode wire feeding device for the wire electric discharge machine according to claim 2, wherein a piezoelectric sheet (16) is mounted on a side wall of the magnetic ring (15), a plurality of warning lamps (10) are mounted on a side wall of the rail frame (7), and the piezoelectric sheet (16) is electrically connected with the adjacent warning lamps (10).

5. The electrode wire conveying device for the wire cut electric discharge machine according to claim 1, wherein a tensioning frame (3) penetrates through the support plate (1), an adjusting screw (5) in threaded connection with the tensioning frame (3) is rotatably connected to the upper end of the support plate (1), and a tensioning wheel (4) is rotatably arranged on the tensioning frame (3).