A medium-speed wire automatic wire burning and threading device and a wire burning and threading method

Abstract

The application provides a medium-wire automatic wire burning and threading device and a wire burning and threading method. The device comprises a roller assembly, a wire burning assembly, a wire threading assembly and a control system. The roller assembly comprises a roller and a wire clamping moving end face arranged at one end of the roller. The wire burning assembly comprises a lower arm arranged at one side of the roller and extending in a direction perpendicular to the axial direction of the roller, an adapter plate cylinder arranged at one end of the lower arm away from the roller, a first conductive block and a second conductive block arranged on the adapter plate, and a wire burning device. The wire threading assembly comprises a first guide rail arranged below the lower arm in parallel, a rotating cylinder arranged on the first guide rail and moving along the first guide rail, and a finger cylinder connected with the rotating cylinder and being lifted or lowered with the rotation of the rotating cylinder to clamp the wire. The method is used for controlling the device. The medium-wire automatic wire burning and threading are realized, the operation complexity of the staff is reduced, and the mechanization level and the electric spark machining efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric spark cutting, in particular to a middle wire-cut automatic wire burning and threading device and a wire burning and threading method. BACKGROUND

[0002] Electric spark machining is a processing method for reasonably utilizing electric corrosion. The method removes materials through pulse spark discharge between a tool electrode and a workpiece electrode, thereby completing the processing of the shape of the materials. In the process of wire-cut electric spark machining, the electrode wire is used as the tool electrode, the workpiece to be cut is used as the workpiece electrode, and spark discharge occurs under the excitation of the pulse power source to generate heat to melt or even vaporize the workpiece. The explosion generated in this process throws the removed materials away from the workpiece, which are carried away by the working fluid and filtered.

[0003] Wire-cut electric spark machining adopts the principle of electric processing and can process many materials that are difficult to process by ordinary processing methods, such as PCD materials with high hardness, materials with high melting points and high energy consumption, and brittle materials that are difficult to process by mechanical means. Due to its strong applicability, high precision, and low cost, it has been widely used in the fields of automobiles, aviation, machine tool production, etc.

[0004] At present, the automatic threading technology is relatively mature on the single wire-cut electric spark machining tool, but due to the reciprocating wire-cut in the middle wire-cut technology instead of the single wire-cut, and the different wire materials used in the middle wire-cut electric spark wire cutting and the single wire-cut electric spark wire cutting, the single wire-cut electric spark wire cutting mainly uses copper wire, while the middle wire-cut electric spark wire cutting mainly uses molybdenum wire, and the rigidity of the two is different, the rigidity of the molybdenum wire is large, which leads to a larger bending degree and makes it more difficult to control the position. Therefore, the automatic threading technology in the single wire-cut cannot be applied to the middle wire-cut.

[0005] In the prior art, the middle wire-cut is mainly realized by manual threading and wire burning, which has low automation level, consumes a long time, and is prone to safety accidents. SUMMARY

[0006] In view of the problems in the prior art, the embodiments of the present application provide a middle wire-cut automatic wire burning and threading device and a wire burning and threading method, which can at least partially solve the problems in the prior art.

[0007] In a first aspect, the present application provides a middle wire-cut automatic wire burning and threading device, comprising a roller assembly, a wire burning assembly, and a wire feeding assembly.

[0008] The roller assembly comprises a roller and a wire clamping and moving end face. The wire clamping and moving end face is arranged at one end of the roller. During electric spark machining, the wire is wound around the roller and clamped between the roller and the wire clamping and moving end face at one end.

[0009] The wire burning assembly comprises a lower arm, an adapter plate cylinder, an adapter plate, a first conductive block and a second conductive block.

[0010] The lower arm is arranged at one side of the roller drum and extends in a direction perpendicular to the axial direction of the roller drum.

[0011] The adapter plate is arranged at one end of the lower arm away from the roller drum through the adapter plate cylinder.

[0012] The first conductive block and the second conductive block are arranged on the adapter plate, and the first conductive block is located above the second conductive block.

[0013] The wire feeding assembly comprises a first guide rail, a rotating cylinder and a finger cylinder.

[0014] The first guide rail is arranged in parallel below the lower arm.

[0015] The rotating cylinder is arranged on the first guide rail and moves along the first guide rail.

[0016] The finger cylinder is connected with the rotating cylinder and is lifted or lowered with the rotation of the rotating cylinder to clamp the wire.

[0017] The wire feeding assembly further comprises a guide assembly, and the guide assembly comprises a first guide wheel, an upper guide and a lower guide.

[0018] The lower guide is arranged at one end of the lower arm away from the roller drum and above the adapter plate.

[0019] The first guide wheel is arranged vertically above the lower guide.

[0020] The upper guide is arranged between the first guide wheel and the lower guide.

[0021] When the lower guide is an open-close guide, the guide assembly further comprises:

[0022] A lower open-close cylinder is arranged on both sides of the lower guide and controls the opening and closing of the lower guide by moving.

[0023] When the upper guide is an open-close guide, the guide assembly further comprises:

[0024] An upper open-close cylinder is arranged on both sides of the upper guide and controls the opening and closing of the upper guide by moving.

[0025] The guide assembly further comprises:

[0026] A second guide wheel is arranged on the adapter plate and below the first conductive block and the second conductive block.

[0027] A third guide wheel is arranged above the lower arm.

[0028] The wire threading assembly comprises a second guide rail, a moving table, a first wire feeding wheel, a second wire feeding wheel, a first wire feeding wheel cylinder, a second wire feeding wheel cylinder, a first wire feeding wheel motor, a second wire feeding wheel motor, and a wire guide tube.

[0029] The second guide rail is arranged on one side of the first guide wheel and the upper guide, and the extension direction is parallel to the line connecting the first guide wheel and the upper guide.

[0030] The moving table is arranged on the second guide rail and moves between the first guide wheel and the lower guide along the second guide rail.

[0031] The first wire feeding wheel and the second wire feeding wheel are arranged in the moving table and are fixed to the top of the moving table by the first wire feeding wheel motor and the second wire feeding wheel motor, respectively.

[0032] The first wire feeding cylinder is connected to the first wire feeding wheel, and the second wire feeding cylinder is connected to the second wire feeding wheel.

[0033] The wire guide tube is arranged at the bottom of the moving table, and the wire enters the wire guide tube from the opening at the bottom of the moving table.

[0034] The wire threading assembly further comprises a bending detection device arranged in the moving table and located below the first wire feeding wheel and the second wire feeding wheel.

[0035] The wire threading assembly further comprises a pressure sensor arranged at the end of the wire guide tube.

[0036] The wire feeding assembly further comprises a detection sheet arranged on the rotating cylinder to detect the potential change of the finger cylinder.

[0037] The wire feeding assembly further comprises an insulating gasket arranged on the first guide rail.

[0038] The rotating cylinder is arranged on the gasket and moves along the first guide rail with the gasket.

[0039] The wire feeding assembly further comprises a wire releasing detection electrode arranged between the roller and the lower arm and slightly above the lowest end of the roller to detect whether the roller has rotated to the wire releasing position.

[0040] The wire feeding assembly further comprises a wire clamping detection electrode arranged on the side of the roller away from the lower arm and slightly above the lowest end of the roller to detect whether the wire roller can start clamping the wire.

[0041] Further comprising:

[0042] A tension wheel guide rail is arranged above the lower arm and parallel to the lower arm.

[0043] A tension wheel is arranged on the tension wheel guide rail and moves along the tension wheel guide rail to adjust the tension of the wire.

[0044] Further comprising:

[0045] A wire clamping fixed end face is fixed to one end of the roller.

[0046] A limiting piece includes a protruding part and a limiting part. The protruding part is fixedly connected to the wire clamping fixed end face, and the limiting part has a gap with the wire clamping fixed end face. The wire clamping moving end face is arranged in the gap.

[0047] A moving piece is arranged on the side of the limiting piece away from the roller and is fixedly connected to the wire clamping moving end face.

[0048] A separation unlocking device controls the movement of the moving piece.

[0049] A bearing passes through the roller, wire clamping fixed end face, limiting piece, wire clamping moving end face, moving piece, and separation unlocking device, and is fixedly connected to the roller.

[0050] Further comprising: a spring arranged between the limiting part of the limiting piece and the wire clamping moving end face.

[0051] Further comprising:

[0052] A first motor for driving the rotation of the roller is fixedly connected to the roller.

[0053] A synchronous belt and a pulley are connected by the synchronous belt and the roller.

[0054] A lead screw is fixedly connected to the pulley.

[0055] A rotatable nut is sleeved with the lead screw. When the rotatable nut rotates, it drives the non-rotating lead screw to move axially.

[0056] A first gear is fixedly connected to the rotatable nut and rotates coaxially with the rotatable nut.

[0057] A second gear is engaged with the first gear.

[0058] A second motor for driving the rotation of the second gear is fixedly connected to the second gear and is locked when the roller rotates.

[0059] In a second aspect, the application provides a method for automatically burning a wire in a medium-speed wire-cut EDM machine, which is implemented by the automatic wire-burning and wire-threading device according to any of the above embodiments, and includes the following steps:

[0060] controlling the rotary cylinder to move between the drum and the lower arm, and turning on the rotary cylinder and the finger cylinder;

[0061] after the wire feeding assembly detects the electrode wire, turning off the finger cylinder to clamp the wire;

[0062] controlling the wire clamping moving end to move in a direction away from the drum;

[0063] turning off the rotary cylinder and controlling the rotary cylinder to move a preset distance away from the drum;

[0064] applying a voltage between the first conductive block and the second conductive block to burn the wire.

[0065] after the step of applying a voltage between the first conductive block and the second conductive block to burn the wire, the method further includes the following steps:

[0066] controlling the rotary cylinder to move to an end of the first guide rail close to the drum, and turning on the rotary cylinder and the finger cylinder to discard the waste wire.

[0067] after the step of controlling the rotary cylinder to move a preset distance away from the drum, the method further includes the following steps:

[0068] controlling the wire clamping moving end to move in a direction close to the drum, so as to reset the wire clamping moving end, and turning on the constant tension mode.

[0069] In a third aspect, the application provides a method for automatically threading a wire in a medium-speed wire-cut EDM machine, which is implemented by the automatic wire-burning and wire-threading device according to any of the above embodiments, and includes the following steps:

[0070] turning on the adapter plate cylinder to drive the adapter plate away from the lower guide;

[0071] controlling the moving table to drive the wire guide tube to move downward along the second guide rail;

[0072] when the wire guide tube contacts the lower guide or the finger cylinder, controlling the finger cylinder to open;

[0073] turning on the first wire feeding wheel cylinder and the second wire feeding wheel cylinder to drive the first wire feeding wheel and the second wire feeding wheel to rotate towards each other to feed the wire;

[0074] after the finger cylinder contacts the wire, turning off the first wire feeding wheel cylinder, the second wire feeding wheel cylinder and the finger cylinder.

[0075] Wherein, after the first wire feeding wheel cylinder, the second wire feeding wheel cylinder and the finger cylinder are closed, the method further comprises:

[0076] Controlling the rotating cylinder to move along the first guide rail towards the direction of the drum, and rotating while moving, gradually reducing the height of the finger cylinder;

[0077] Controlling the wire clamping moving end face to move away from the drum, when the rotating cylinder moves to the rear of the drum, opening the rotating cylinder, and lifting the finger cylinder;

[0078] Controlling the wire clamping moving end face to reset, opening the finger cylinder to release the wire, and closing the rotating cylinder and the finger cylinder.

[0079] The automatic wire burning and threading device and the wire burning and threading method provided by the application are realized by a drum assembly, a wire burning assembly and a wire feeding assembly. The drum assembly comprises a drum and a wire clamping moving end face. The wire clamping moving end face is arranged at one end of the drum. When electric spark machining is performed, the wire is wound around the drum and loaded between the wire clamping moving end faces at one end. The wire burning assembly comprises a lower arm, a transfer plate cylinder, a transfer plate, a first conductive block and a second conductive block. The lower arm is arranged at one side of the drum and extends in a direction perpendicular to the axial direction of the drum. The transfer plate is arranged at the end of the lower arm away from the drum through the transfer plate cylinder. The first conductive block and the second conductive block are arranged on the transfer plate, and the first conductive block is located above the second conductive block. The wire feeding assembly comprises a first guide rail, a rotating cylinder and a finger cylinder. The first guide rail is arranged in parallel below the lower arm. The rotating cylinder is arranged on the first guide rail and moves along the first guide rail. The finger cylinder is connected with the rotating cylinder and is lifted or lowered with the rotation of the rotating cylinder to clamp the wire. The automatic wire burning and threading device and the wire burning and threading method realize automatic wire burning and threading, reduce the complexity of the operation of the staff, and greatly improve the mechanization level and the electric spark machining efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0080] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0081] Figure 1 is a structural schematic diagram of the automatic wire burning and threading device provided by some embodiments of the application;

[0082] Figure 2 is a structural schematic diagram of the drum assembly provided by some embodiments of the application;

[0083] Figure 3is a structural schematic diagram of a roller assembly provided by some embodiments of the present application;

[0084] Figure 4 is a structural schematic diagram of a roller assembly provided by some embodiments of the present application;

[0085] Figure 5 is a flowchart of a method of automatic wire burning in a wire-fed welding machine provided by some embodiments of the present application;

[0086] Figure 6 is a flowchart of a method of automatic wire threading in a wire-fed welding machine provided by some embodiments of the present application;

[0087] Figure 7 is a structural schematic diagram of a roller assembly provided by some embodiments of the present application;

[0088] Figure 8 is a structural schematic diagram of a roller assembly provided by some embodiments of the present application;

[0089] Figure 9 is a structural schematic diagram of a roller assembly provided by some embodiments of the present application;

[0090] Figure 10 is a structural schematic diagram of a wire burning and threading device in a wire-fed welding machine provided by some embodiments of the present application;

[0091] Figure 11 is a structural schematic diagram of a wire threading assembly provided by some embodiments of the present application;

[0092] Figure 12 is a flowchart of a method of automatic wire burning in a wire-fed welding machine provided by some embodiments of the present application;

[0093] Figure 13 is a flowchart of a method of automatic wire threading in a wire-fed welding machine provided by some embodiments of the present application;

[0094] Figure 14 is a flowchart of a method of automatic wire threading in a wire-fed welding machine provided by some embodiments of the present application;

[0095] Figure 15 is a flowchart of a method of automatic wire threading in a wire-fed welding machine provided by some embodiments of the present application;

[0096] Figure 16 is a state schematic diagram of a wire burning and threading device in a wire-fed welding machine provided by some embodiments of the present application. DETAILED DESCRIPTION

[0097] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, further detailed descriptions of the embodiments of the present application will be given below with reference to the drawings. Here, the illustrative embodiments of the present application and their descriptions are used to explain the present application but should not be considered as limiting the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other at will without conflict.

[0098] In actual production and processing, on the one hand, the electrode wire may sometimes break, and on the other hand, the wire may need to be actively broken to make a hole. In these cases, the operator needs to manually cut the wire and rethread the wire, and then fix the wire at a specific position on the roller, which results in interruption of the processing flow and reduction of the processing efficiency.

[0099] The main differences between the reciprocating wire (middle wire) and the slow wire are as follows:

[0100] 1. The wire materials used in the reciprocating wire electric discharge wire cutting and the unidirectional wire electric discharge wire cutting are different. The unidirectional wire electric discharge wire cutting mainly uses copper wire, while the reciprocating wire electric discharge wire cutting mainly uses molybdenum wire. The rigidity of the two is different, and the rigidity of the molybdenum wire is greater, which results in greater bending degree and more difficult to control the position.

[0101] 2. The wire speeds in the reciprocating wire electric discharge wire cutting and the unidirectional wire electric discharge wire cutting are different. The wire speed of the reciprocating wire electric discharge wire cutting is 1-12 m / s, while the wire speed of the unidirectional wire electric discharge wire cutting is generally less than 0.2 m / s. This means that in the processing process of the reciprocating wire, the wire moves at a high speed, which can cause a lot of wear itself, and the threading part needs to consider how to prevent wear.

[0102] 3. The wire directions in the reciprocating wire electric discharge wire cutting and the unidirectional wire electric discharge wire cutting are different. In the processing process of the reciprocating wire electric discharge wire cutting, the electrode wire reciprocates, while in the processing of the unidirectional wire electric discharge wire cutting, the electrode wire moves in one direction and is not reused after use. This results in that in the automatic threading of the reciprocating wire, both ends of the wire need to be fixed on the wire drum, while in the unidirectional wire, only one end of the wire needs to be fixed on the roller, and the other end is considered as waste wire.

[0103] 4. Reciprocating wire EDM and unidirectional wire EDM have different situations corresponding to wire breaking. In reciprocating wire EDM, there are two situations of wire breaking, one is accidental wire breaking in the processing, and the other is artificial control of wire breaking in order to pass through a small hole. For unidirectional wire EDM, the two wire breaking processing methods are basically the same; while for reciprocating wire EDM, since the wire is used reciprocally, accidental wire breaking means the abandonment of the entire roll of wire, therefore, accidental wire breaking of reciprocating wire EDM can only be avoided as much as possible, and once it occurs, it cannot be processed by automatic threading technology.

[0104] Therefore, slow wire EDM automatic threading is difficult to be applied to medium wire EDM, and in the prior art, wire breaking and threading are still mainly performed manually. When wire breaking is performed manually, a pneumatic shear is often used to cut the wire. When wire breaking is performed in this way, the cross section of the wire is extruded in the direction, and the thickness of the cross section is thinned, while the length in the direction perpendicular to the cross section is lengthened, which is greater than the original diameter of the wire, resulting in increased difficulty in subsequent threading.

[0105] To solve the problems in the prior art, the present application provides a medium wire EDM automatic wire burning and threading device and a wire burning and threading method.

[0106] Figure 1 is a structural schematic diagram of a medium wire EDM automatic wire burning and threading device provided by some embodiments of the present application, as shown in Figure 1 The medium wire EDM automatic wire burning and threading device provided by the present application comprises a roller assembly 100, a wire burning assembly 200 and a wire feeding assembly 300.

[0107] The roller assembly 100 (please refer to Figure 2 and Figure 3 ) comprises a roller 101 and a wire clamping moving end face 102; the wire clamping moving end face 102 is arranged at one end of the roller 101; during electric spark machining, the wire is wound around the roller 101, and one end is clamped between the roller 101 and the wire clamping moving end face 102.

[0108] Specifically, as shown in Figure 2 during normal processing, the wire is uniformly wound around the roller, one end is fixed on the screw 103 of the roller, and the other end is fixed between the roller 101 and the wire clamping moving end face 102 and is clamped by the roller 101 and the wire clamping moving end face. The rotation of the roller 101 realizes the movement of the wire, so as to perform electric spark cutting. With the rotation of the roller 101, the wire used for cutting also moves from one end of the roller 101 to the other end. In order to ensure that the position of the wire for cutting remains unchanged, the roller 101 moves left and right while rotating.

[0109] The wire clamping moving end face 102 can move along the direction of the drum axis, and when the wire clamping moving end face 102 moves towards the drum 101, the wire is clamped between the wire clamping moving end face 102 and the drum 101, so as to realize the fixation of the wire; when the wire clamping moving end face 102 moves away from the drum 101, the wire is released.

[0110] In an embodiment, as shown in FIG. 1, the drum assembly 100 further comprises a wire clamping fixed end face 104, a limiting piece 105, a moving piece 106, a separation unlocking device 107 and a bearing 108. Figure 3

[0111] The wire clamping fixed end face 104 is fixed at one end of the drum 101; the limiting piece 105 comprises a protruding part 1051 and a limiting part 1052, the protruding part 1051 is fixedly connected with the wire clamping fixed end face 104, and the limiting part 1052 has a gap with the wire clamping fixed end face 104; the wire clamping moving end face 102 is arranged in the gap.

[0112] Specifically, a plurality of threaded holes can be arranged on the side surface of the drum 101 and the wire clamping fixed end face 104, and the wire clamping fixed end face 104 and the drum 101 are fixed by the screws 109 passing through the threaded holes. In addition, the fixation of the drum 101 and the wire clamping fixed end face 104 can also be realized by other ways, such as welding, bonding, etc., and the specific fixation mode of the drum 101 and the wire clamping fixed end face 104 is not limited in the present application. The protruding part 1051 and the limiting part 1052 of the limiting piece 105 are an integral structure or are fixedly connected. Axial threaded holes can be arranged on the protruding part 1051 and the wire clamping fixed end face 104 in correspondence, and the screws 109 are arranged in the threaded holes to realize the fixation of the limiting piece 105 and the wire clamping fixed end face 104. The wire clamping moving end face 102 is an annular structure with a protruding edge on the outer side, which is arranged in the gap formed by the limiting part 1052 of the limiting piece 105 and the wire clamping fixed end face 104 and moves in the gap, and the protrusion of the edge extends to the outside of the limiting part 1052 of the limiting piece 105. The gap formed by the limiting part 1052 of the limiting piece 105 and the wire clamping fixed end face 104 limits the moving range of the wire clamping moving end face 102, so as to prevent the position of the wire clamping moving end face from deviating too much.

[0113] In an embodiment, as shown in FIG. 1, the drum assembly 100 further comprises a wire clamping fixed end face 104, a limiting piece 105, a moving piece 106, a separation unlocking device 107 and a bearing 108. Figure 4 ​As shown, a counterbore can be arranged on the limiting portion 1052 of the limiting member 105, and a spring 110 is arranged in the counterbore, so that the spring 110 is located between the limiting portion 1052 and the yarn clamping moving end face 102. When the spring 110 is naturally elongated, the yarn clamping moving end face 102 is pressed against the yarn clamping fixed end face 104, so as to clamp the yarn. Through the protruding structure outside the yarn clamping moving end face 102, the yarn clamping moving end face 102 can be driven to move towards the limiting portion 1052 of the limiting member 105, so as to compress the spring 110 and separate from the yarn clamping fixed end face 104, and the yarn is released.

[0114] Please continue to refer to Figure 3 The moving member 106 is arranged on the side of the limiting member 105 away from the roller 101 and is fixedly connected with the yarn clamping moving end face 102; the separation unlocking device 107 is used for controlling the movement of the moving member 106; and the bearing 108 penetrates through the roller 101, the yarn clamping moving end face 102, the yarn clamping fixed end face 104, the limiting member 105 and the moving member 106 and is fixedly connected with the roller.

[0115] Specifically, the moving member 106 is connected with the protruding structure of the edge outside the yarn clamping moving end face 102 and can move along the direction of the bearing 108 under the action of the separation unlocking device 107, so as to drive the yarn clamping moving end face 102 to compress the spring 110 and move away from the yarn clamping fixed end face 104. The structure of the separation unlocking device 107 can be arranged according to the moving member 106. The moving member 106 can be connected with the yarn clamping moving end face 102 through a screw or can be welded with the yarn clamping moving end face 102, and the application does not limit the connection mode of the yarn clamping moving end face 102 and the moving member 106.

[0116] In an embodiment, the moving member 106 is a ferromagnetic material, and at this time, the separation unlocking device 107 can be an electromagnet arranged on a fixed plane. Under normal processing conditions, the electromagnet is closed and has a certain distance from the moving member 106. Under the action of the spring 110, the yarn clamping moving end face 102 is tightly attached to the yarn clamping fixed end face 104, the yarn is clamped, and the roller 101 rotates. When the roller 101 stops to take the yarn, the electromagnet is opened, the moving member 106 is adsorbed, and under the driving of the moving member 106, the yarn clamping moving end face 102 compresses the spring and moves away from the yarn clamping fixed end face 104 to release the yarn. By separating the electromagnet from the roller 101 and having a moving distance, the influence of the separation unlocking device 107 on the dynamic balance of the roller 101 when the roller 101 rotates is prevented.

[0117] On the basis of the previous embodiment, further, a cylinder (not shown) can be further arranged in the separation unlocking device 107 and connected with the electromagnet. In the normal processing condition, the electromagnet has a certain distance from the moving part 106. When the roller 101 stops for taking the wire, the cylinder is opened to drive the electromagnet to move towards the roller 101. When the electromagnet contacts with the moving part 106, the electromagnet is opened to attract the moving part 106. Then, the cylinder is closed to reset the electromagnet to drive the moving part 106 to move away from the roller 101, so that the wire clamping moving end surface 102 is separated from the wire clamping fixed end surface 104 on the roller 101 to release the wire. After the wire is taken, the cylinder is opened again to drive the electromagnet to move towards the roller 101. Then, the electromagnet is closed to release the moving part 106, and the cylinder is closed to reset the electromagnet. By arranging the cylinder, the process of clamping and releasing the wire can be carried out smoothly, and the collision between the moving part 106 and the electromagnet, the wire clamping moving end surface 102 and the wire clamping fixed end surface 104 can be avoided when the electromagnet is opened and closed. In addition, the electromagnet attraction force can be avoided to cause the moving part 106 to be unable to be attracted, and the wire can be released smoothly.

[0118] The separation unlocking device 107 can also be realized by other structures that can drive the moving part 106 to move, such as a cylinder or a mechanical arm connected with the moving part 106. The specific structure of the separation unlocking device is not limited in the application.

[0119] In addition, the wire clamping moving end surface 102 can be clamped with the roller 101 only by a buckle or a cylinder fixed on the wire clamping moving end surface 102, and the separation of the wire clamping moving end surface 102 and the roller 101 can be realized by opening the buckle or the cylinder. Although the structure in Figure 3 is a relatively optimal embodiment, the structure of the roller assembly 100 is not limited in the application.

[0120] The automatic wire burning and threading device provided in the application can realize 360° automatic wire clamping and releasing, reduce the weight of the roller assembly as a whole, and further reduce the energy required for the rotation of the roller.

[0121] Please continue to refer to Figure 1 The wire burning assembly 200 comprises a lower arm 201, a switching plate cylinder 202, a switching plate 203, a first conductive block 204 and a second conductive block 205. The lower arm 201 is arranged on one side of the roller 101 and extends in a direction perpendicular to the axial direction of the roller 101. The switching plate 203 is arranged at the end of the lower arm 201 away from the roller 101 through the switching plate cylinder 202. The first conductive block 204 and the second conductive block 205 are arranged on the switching plate 203, and the first conductive block 204 is located above the second conductive block 205.

[0122] Specifically, the lower arm 201 is provided with a through hole at one end away from the roller 101, and the electrode wire passes through the upper part of the through hole to the lower part of the lower arm 201. The adapter plate 203 and the adapter plate cylinder 202 are also provided on the side of the lower arm 201 away from the roller 101 and below the through hole. When the adapter plate cylinder 202 is closed, the adapter plate 203 is a certain distance away from the through hole, so that the wire feeding assembly 300 can clamp the wire below the through hole during the wire feeding process; when the adapter plate cylinder 202 is opened, the adapter plate 203 moves directly below the through hole, so that the first conductive block 204 and the second conductive block 205 contact the wire, and a voltage applied between the first conductive block 204 and the second conductive block 205 can complete the wire burning.

[0123] The wire feeding assembly 300 includes a first guide rail 301, a rotating cylinder 302, and a finger cylinder 303. The first guide rail 301 is arranged parallel below the lower arm 201. The rotating cylinder 302 is arranged on the first guide rail 301 and moves along the first guide rail 301. The finger cylinder 303 is connected with the rotating cylinder 302 and is lifted or lowered with the rotation of the rotating cylinder 302 to clamp the wire.

[0124] Specifically, the first guide rail 301 is arranged parallel below the lower arm 201. When the rotating cylinder 302 is opened, the finger cylinder 303 is lifted; when the rotating cylinder 302 is closed, the finger cylinder 303 is lowered. When the finger cylinder 303 is opened, the fingers are opened; when the finger cylinder 303 is closed, the fingers are closed to clamp the wire.

[0125] During the wire burning, one end of the wire is clamped in the finger cylinder of the wire feeding assembly 300, and the constant tension is maintained by the roller 101 and the tension assembly. At the same time of wire burning, the wire is finally pulled off due to the tension, and the diameter of the broken section is obviously smaller than the original diameter of the wire, so that the wire is more easily passed through various holes during the subsequent wire feeding process, greatly improving the success rate of wire feeding.

[0126] The application provides a middle wire automatic wire burning and threading device, which comprises a roller assembly, a wire burning assembly and a wire feeding assembly.

[0127] In an embodiment, as shown in the figure, Figure 1 The middle wire automatic wire burning and threading device also comprises a tension wheel guide rail (not shown) and a tension wheel 401, wherein the tension wheel guide rail is arranged above the lower arm and parallel to the lower arm, and the tension wheel 401 is arranged on the tension wheel guide rail and moves along the tension wheel guide rail to adjust the tension of the wire.

[0128] Specifically, the tension of the electrode wire can be adjusted by further arranging the tension wheel, when the tension wheel 401 moves towards the roller 101, the wire is pulled tight and the tension increases, and when the tension wheel 401 moves away from the roller 101, the wire is released and the tension decreases. The tension can be further adjusted by moving the tension wheel 401, which prevents the roller 101 from switching back and forth in the rolling direction and avoids the roller 101 from rotating too frequently.

[0129] In some embodiments, as shown in the figure, Figure 1 The middle wire automatic wire burning and threading device also comprises a guide assembly 500, wherein the guide assembly 500 comprises a first guide wheel 501, an upper guide 502 and a lower guide 503.

[0130] The lower guide 503 is arranged at the end of the lower arm 201 away from the roller 101 and above the adapter plate 203, the first guide wheel 501 is arranged vertically above the lower guide 503, and the upper guide 502 is arranged between the first guide wheel 501 and the lower guide 503.

[0131] Specifically, the electrode wire used in the medium-speed wire cutting is usually molybdenum wire, which is easy to bend. By setting the first guide wheel 501, the upper guide 502 and the lower guide 503, the direction of the wire can be constrained, and the movement direction of the wire can be ensured. The first guide wheel 501 is used to change the direction of the wire, so that the wire moves vertically downward. The lower guide 503 is arranged on a section of the lower arm 201, and at this time, the through hole on the lower arm 201 is the wire hole of the lower guide 503. The upper guide 502 and the lower guide 503 can be open-close guides or integrated guides. When the upper guide 502 and the lower guide 503 are open-close guides, the first guide wheel 501 can also prevent the wire from being clamped by the end face of the open-close guide, and prevent the abrasion of the wire guide tube.

[0132] In addition, when the lower guide 503 is an open-close guide, a lower opening and closing cylinder (not shown) can also be arranged on both sides of the lower guide 503. Since the open-close guide is composed of left and right parts, and the wire guide hole is located between the left and right parts, the lower opening and closing cylinder can drive the left and right parts of the lower guide 503 to move to both sides or the middle, thereby controlling the opening and closing of the lower guide 503.

[0133] Similarly, when the upper guide 502 is an open-close guide, an upper opening and closing cylinder can be arranged on both sides of the upper guide 502, which can drive the left and right parts of the upper guide 502 to move to both sides or the middle, thereby controlling the opening and closing of the upper guide 502.

[0134] By setting the upper guide 502 and the lower guide 503 as open-close guides and corresponding setting the upper and lower opening and closing cylinders, the difficulty of the wire passing through the small hole of the guide can be greatly reduced, and the subsequent wire passing success rate can be improved.

[0135] In some embodiments, as shown in Figure 1 the guide assembly 500 further includes a second guide wheel 504 and a third guide wheel 505;

[0136] The second guide wheel 504 is arranged on the adapter plate 203 and located below the first conductive block 204 and the second conductive block 205;

[0137] Specifically, the second guide wheel 504 extends out with the adapter plate 203 during normal processing to constrain the position of the wire and convert the wire from a vertical direction to a horizontal direction; when threading the wire, the second guide wheel 504 moves out of the way with the adapter plate 203 to facilitate the finger cylinder 303 to clamp the wire. By providing the second guide wheel 504, the vertical wire can be constrained together with the first guide wheel 501, and when the upper guide and the lower guide are open-close guides, the wire is prevented from being clamped by the end faces of the open-close guide. In addition, under the joint action of the first guide wheel 501 and the second guide wheel 504, the wire in the wire guide tube can also be constrained to prevent the wire guide tube from being cut by the wire.

[0138] The third guide wheel 505 is disposed above the lower arm 201 .

[0139] Specifically, the third guide wheel 505 is disposed above the lower arm 201 and is tangent to the tangent line at the uppermost point of the drum 101, thereby directing the wire extending from the drum 101 from a horizontal tangential direction to an upward direction. The third guide wheel 505 can be mounted on a wire rack or on another support, and the present application does not limit the specific fixing method of the third guide wheel.

[0140] The medium-speed wire-cutting automatic wire burning and threading device provided in this application realizes the guidance and restriction of the direction of the electrode wire by setting the first guide wheel 501, the upper guide 502, the lower guide 503, the second guide wheel 504 and the third guide wheel 505, prevents the molybdenum wire from bending, and ensures the normal operation of various working conditions.

[0141] In some embodiments, as Figure 1 As shown, the medium-speed wire automatic burning wire threading device provided by the present application further includes: a wire threading assembly 600; the wire threading assembly 600 includes: a first wire feeding wheel 601, a second wire feeding wheel 602, a first wire feeding wheel cylinder and a second wire feeding wheel cylinder (not shown);

[0142] Among them, the first wire feeding wheel 601 and the second wire feeding wheel 602 are arranged between the first guide wheel 501 and the upper guide 502; the first wire feeding wheel cylinder is fixedly connected to the first wire feeding wheel 601, and the second wire feeding wheel cylinder is fixedly connected to the second wire feeding wheel 602.

[0143] Specifically, the wire passes through the middle of the first wire feeding wheel 601 and the second wire feeding wheel 602 and contacts the first wire feeding wheel 601 and the second wire feeding wheel 602, and the first wire feeding wheel cylinder and the second wire feeding wheel cylinder are both rotary cylinders. When threading the wire, the first wire feeding wheel cylinder is opened to drive the first wire feeding wheel 601 to rotate clockwise, and at the same time, the second wire feeding wheel cylinder is started to drive the second wire feeding wheel 602 to rotate counterclockwise, so as to feed the wire downward to realize wire threading; when the wire threading fails, the first wire feeding wheel 601 is controlled to rotate counterclockwise, and at the same time, the second wire feeding wheel 602 is controlled to rotate clockwise to retract the wire by a little and rethread the wire. The first wire feeding wheel 601 and the second wire feeding wheel 602 may, for example, be rubber wheels and ceramic wheels respectively, so as to ensure insulation and increase friction to realize smooth wire feeding, but the application is not limited thereto, and the wire feeding wheel can be of any material that is insulated and has a certain friction.

[0144] The automatic wire burning and threading device for medium-speed wire provides automatic wire threading and repeated trial-and-error wire threading by arranging the first wire feeding wheel, the second wire feeding wheel, the first wire feeding wheel cylinder and the second wire feeding wheel cylinder.

[0145] The use of the automatic wire burning and threading device for medium-speed wire will be described below. Figure 1 The process of burning wire by the automatic wire burning and threading device for medium-speed wire provided in the embodiment is described. Figure 5 The flowchart of the automatic wire burning method for medium-speed wire provided in some embodiments of the application, which can be controlled by a server or by a worker, is shown in FIG. 1. Figure 5 The automatic wire burning method for medium-speed wire provided in the application includes the following steps:

[0146] S501: Move the rotary cylinder 302 to the gap between the roller 101 and the lower arm 201, and open the rotary cylinder 302 and the finger cylinder 303.

[0147] Specifically, when electric spark machining is performed, the electrode wire is discharged from the roller 101, passes through the upper arm (not shown) and the lower arm 201, and then returns to the roller, so the rotary cylinder 302 and the finger cylinder 303 can be moved to the gap between the roller 101 and the lower arm 201 to clamp the wire. The rotary cylinder 302 is opened to lift the finger cylinder 303 to touch the electrode wire, and the finger cylinder 303 is opened to open the fingers to make the electrode wire located between the fingers of the finger cylinder 303, ready for clamping the wire.

[0148] S502: After the electrode wire is detected by the wire feeding assembly 300, the finger cylinder 303 is closed to clamp the wire.

[0149] Specifically, since the electrode wire belt point, when the finger cylinder 303 encounters the electrode wire, the potential will change, so the electrode wire can be detected by detecting the potential change, and the detection of the electrode wire can also be realized by image recognition camera or observation of the staff, the specific way of detecting the electrode wire is not limited in the application. After detecting the electrode wire, it means that the electrode wire has been located between the fingers of the finger cylinder 303, and the finger cylinder 303 is closed to close the fingers. At this time, the finger cylinder 303 clamps the wire.

[0150] S503: Control the wire clamping moving end surface 102 to move away from the roller 101;

[0151] Specifically, according to the structure of the roller assembly 100, the way to control the wire clamping moving end surface 102 away from the roller 101 is also different. For example, when the separation unlocking device is provided, the separation unlocking device 107 can be opened, and the moving part 106 drives the wire clamping moving end surface to move away from the roller 101 to release the wire.

[0152] S504: Close the rotary cylinder 302, and move the rotary cylinder 302 away from the roller 101 by a preset distance;

[0153] Specifically, closing the rotary cylinder 302 lowers the finger cylinder 303 to reduce the height of the wire, and takes out the wire from between the wire clamping moving end surface 102 and the roller 101. Then, control the rotary cylinder 302 to move away from the roller 101 by a preset distance to prevent part of the electrode wire from remaining between the wire clamping moving end surface 102 and the roller 101, and ensure that the electrode wire is completely taken out. The preset distance can be set according to the diameter of the roller 101, the length of the lower arm 201 and other actual conditions, and the specific length of the preset distance is not limited in the application.

[0154] S505: Apply a voltage between the first conductive block 204 and the second conductive block 205 to burn the wire.

[0155] Specifically, one end of the electrode wire is fixed on the roller 101, and the other end is clamped in the finger cylinder 303, so there is a certain tension on the electrode wire. At this time, a voltage is applied between the first conductive block 204 and the second conductive block 205 to burn the wire, and the wire is pulled off under the action of tension, so that the diameter of the wire fracture is smaller than the original diameter of the wire, to improve the success rate of subsequent threading.

[0156] The automatic middle wire burning method provided in the application moves the rotary cylinder to the position between the roller and the lower arm, turns on the rotary cylinder and the finger cylinder; after the wire feeding assembly detects the electrode wire, the finger cylinder is turned off to clamp the wire; the clamping wire moving end surface is controlled to move in the direction away from the roller; the rotary cylinder is turned off and moved a preset distance away from the roller; a voltage is applied between the first and second conductive blocks to burn the wire, realizing automatic middle wire burning and wire threading, greatly improving the success rate of wire threading, reducing the operation complexity of the staff, and thus improving the mechanization level and the electric spark machining efficiency.

[0157] In an embodiment, after S505, the method further comprises:

[0158] The rotary cylinder 302 is moved to the end of the first guide rail 301 close to the roller 101, and the rotary cylinder 302 and the finger cylinder 303 are turned on to discard the waste wire.

[0159] Specifically, since the finger cylinder 303 clamps the wire between the roller 101 and the lower arm 201 when taking the wire, one end of the wire is clamped between the roller 101 and the clamping wire moving end surface 102, and there is still a distance between the finger cylinder 303 and the end point of the wire. That is, after the wire is burned, a certain length of wire remains on the first guide rail 301, and the remaining wire is located on the side of the finger cylinder 303 close to the roller 101. If the finger cylinder 303 is directly turned on to discard the wire, the wire will be discarded on the first guide rail 301. Since the electrode wire used in the middle wire threading has a certain hardness, moving the rotary cylinder 302 to the end of the first guide rail 301 close to the roller 101 can push the wire off the guide rail, and then turning on the finger cylinder 303 to discard the wire can prevent the wire from remaining on the first guide rail 301 and affecting the subsequent operation. After that, the rotary cylinder 302 can be moved again to the position below the through hole of the lower arm 201 to prepare for clamping the wire during wire threading.

[0160] The automatic middle wire burning method provided in the application moves the rotary cylinder to the end of the first guide rail close to the roller, turns on the rotary cylinder and the finger cylinder to discard the waste wire, realizes automatic waste wire discarding, avoids the waste wire being discarded on the guide rail, and ensures the normal operation of the subsequent operation.

[0161] In an embodiment, after S504, the method further comprises:

[0162] The clamping wire moving end surface 102 is controlled to move in the direction close to the roller 101 to reset the clamping wire moving end surface 102, and the constant tension mode is turned on.

[0163] Specifically, after ensuring that the finger cylinder 303 takes out the wire, the wire clamping moving end surface 102 can be reset. Similarly, the resetting mode of the wire clamping moving end surface 102 depends on the specific structure of the roller assembly 100. For example, when the moving piece 106 and the separate unlocking device 107 including the electromagnet and the cylinder are provided, the cylinder can be first opened to drive the electromagnet, the moving piece 106 attracted by the electromagnet, and the wire clamping moving end surface 102 connected with the moving piece 106 to move in the direction of the roller 101. When the wire clamping moving end surface 102 is reset, the electromagnet is closed to stop attracting the moving piece, and the cylinder is closed to reset the electromagnet. The movement of the wire clamping moving end surface 102 can also be realized by only the cylinder or the mechanical arm, and the present application is not limited thereto.

[0164] After the constant tension mode is opened, the tension of the wire is adjusted by the cooperation of the roller 101 and the tension wheel 401. The tension wheel 401 realizes the tensioning and releasing of the wire through horizontal movement. The roller 101 realizes the winding and unwinding of the wire through rotation, so as to maintain the constant tension, so that the wire can be pulled off under the action of the tension when the wire is burned, and the bending of the wire due to the excessive length of the wire is prevented.

[0165] The use of the automatic wire burning and threading device for medium-speed wire provided in the embodiments will be described below. Figure 1 The process of threading the wire by the automatic wire burning and threading device for medium-speed wire provided in the embodiments will be described. Figure 6 It is a flowchart of the automatic wire threading method for medium-speed wire provided in some embodiments of the present application. The flowchart can be controlled by a server or can be realized by a worker, as shown in Figure 6 The automatic wire threading method for medium-speed wire provided in the present application comprises the following steps:

[0166] S601: Open the adapter plate cylinder 202 to drive the adapter plate 203 to move away from the through hole on the lower arm 201;

[0167] Specifically, the adapter plate cylinder 202 is opened to drive the adapter plate 203 to move away from the through hole on the lower arm 201 to make room for the finger cylinder 303, so that the finger cylinder 303 can smoothly clamp the wire when the wire passes through the through hole. When the lower guide 503 is provided, the through hole on the lower arm is the wire hole of the lower guide 503.

[0168] S602: Open the rotary cylinder 302 to lift the finger cylinder 303, control the finger cylinder 303 to open, and close the finger cylinder 303 after the finger cylinder 303 contacts the wire;

[0169] Specifically, if the rotating cylinder 302 and the finger cylinder 303 are not located below the through hole, the rotating cylinder can be controlled to first move along the first guide rail 301 to the position below the through hole, and then the rotating cylinder 302 is opened to lift the finger cylinder 303, so as to shorten the distance between the finger cylinder 303 and the through hole, thereby reducing the length of the free bending of the wire and improving the success rate of threading. The threading can be performed manually by the staff, or a special threading assembly such as a wire feeding wheel can be provided.

[0170] Since the electrode wire is charged, when the finger cylinder 303 contacts the electrode wire, the potential will change, and the contact between the wire and the finger cylinder 303 can be detected by monitoring the potential change. It can also be realized by image recognition camera or staff observation. After the wire contacts the finger cylinder 303, the finger cylinder 303 is closed, and the wire is clamped at this time.

[0171] S603: Control the rotating cylinder 302 to move along the first guide rail 301 in the direction of the drum 101, and rotate while moving, gradually lower the height of the finger cylinder 303;

[0172] Specifically, the rotating cylinder 302 is controlled to move along the preset trajectory, and the height of the finger cylinder 303 is gradually lowered while moving, so that the electrode wire moves downward without horizontal movement. Then, the adapter plate cylinder 202 can be closed to move the adapter plate 203 below the through hole to provide support for the electrode wire and guide the electrode wire to prevent the electrode wire from being abraded or even broken due to sudden change of direction. The rotating cylinder 302 continues to move in the direction of the drum 101 after completing the direction change of the electrode wire, so as to feed the wire to the drum 101.

[0173] S604: Control the wire clamping moving end face 102 to move away from the drum 101, and when the rotating cylinder 302 moves to the rear of the drum 101, open the rotating cylinder 302 to lift the finger cylinder 303.

[0174] Specifically, the wire clamping moving end face 102 is controlled to move away from the drum 101 to prepare for wire clamping, and when the rotating cylinder 302 moves to the rear of the drum 101, the rotating cylinder 302 is opened to lift the finger cylinder 303, and then the wire is lifted to be located between the wire clamping moving end face 102 and the drum 101.

[0175] S605: Control the wire clamping moving end face 102 to reset, open the finger cylinder 303 to release the wire, and close the rotating cylinder 302 and the finger cylinder 303.

[0176] Specifically, the wire clamping moving end face 102 resets to clamp the wire, the finger cylinder 303 is opened to expand the fingers, and the wire is released. The rotating cylinder 302 is closed to lower the height of the finger cylinder 303, so as to avoid the wire staying between the fingers of the finger cylinder 303, and then the finger cylinder 303 is closed, and the threading is completed.

[0177] The automatic threading method provided in the application opens the adapter plate cylinder to drive the adapter plate to move away from the through hole on the lower arm; the rotating cylinder is opened to lift the finger cylinder, and the finger cylinder is controlled to open, the finger cylinder is closed after contacting the wire; the rotating cylinder is controlled to move along the first guide rail to the direction of the roller, and rotates at the same time, so as to gradually lower the height of the finger cylinder; the wire clamping moving end face is controlled to move away from the roller, the rotating cylinder is opened to lift the finger cylinder when the rotating cylinder moves to the back of the roller; the wire clamping moving end face is reset, the finger cylinder is opened to release the wire, and the rotating cylinder and the finger cylinder are closed, so that the automatic threading is realized, the operation complexity is reduced, the mechanization level is improved, and the electric spark machining efficiency is improved.

[0178] In an embodiment, as shown in Figures 7-9 the automatic wire burning and threading device provided in the application further comprises a first motor 111, a synchronous belt 112, a pulley 113, a lead screw 114, a rotatable nut 115, a first gear 116, a second gear 117 and a second motor 118.

[0179] The first motor 111 is used to drive the roller 101 to rotate, and is fixedly connected with the roller 101; the pulley 113 is connected with the roller 101 through the synchronous belt 112; the lead screw 114 is fixedly connected with the pulley 113; the rotatable nut 115 is sleeved with the lead screw 114, and drives the lead screw 114 to move along the axial direction when the rotatable nut 115 rotates; the first gear 116 is fixedly connected with the rotatable nut 115 and rotates coaxially with the rotatable nut 115; the second gear 117 is engaged with the first gear 116; the second motor 118 drives the second gear 117 to rotate, and is fixedly connected with the second gear 117 and is locked when the roller 101 rotates.

[0180] Specifically, as shown in Figure 7 the first motor 111 is a rotary motor, which is arranged on the side opposite to the synchronous belt 112 of the roller 101, and opening the first motor 111 can drive the roller 101 to rotate. As shown in Figure 8 the synchronous belt 112 has a rough surface and is in contact with one end of the bearing 108, and the bearing 108 drives the synchronous belt 112 to move under the action of friction, so as to further drive the pulley 113 and the lead screw 114 fixedly connected with the pulley 113 to rotate. The pulley 113 and the lead screw 114 will not move relatively with the roller 101. As shown in Figure 9As shown, the surface of the screw rod 114 and the inner side of the rotatable nut 115 are provided with threads, the rotatable nut 115 is sleeved on the screw rod 114, and the threads on the inner side of the rotatable nut 115 and the threads on the surface of the screw rod 114 are mutually embedded.

[0181] In the normal working state, the first motor 111 is turned on to drive the rotation of the roller 101, the rotation of the roller 101 drives the rotation of the screw rod 114, and the rotatable nut 115 is locked and does not rotate, at this time, the screw rod 114 and the rotatable nut 115 are relatively rotated, under the action of the threads, the screw rod 114 and the rotatable nut 115 are relatively moved, since the rotatable nut 115 is fixed, therefore, the screw rod 114 drives the roller 101 to move, so as to realize the reciprocating motion of the roller 101, and ensure that the wire can be uniformly wound on the roller 101.

[0182] When it is desired that the roller 101 does not rotate and moves, the roller 101 is locked, and the screw rod 114 connected with the roller 101 in stages also does not rotate, at this time, the second motor 118 is turned on, under the action of the first gear 116 and the second gear 117, the rotatable nut 115 is driven to rotate, under the action of the threads, the screw rod 114 and the rotatable nut 115 are relatively moved, since the rotatable nut 115 is fixed, therefore, the screw rod 114 drives the roller 101 to move.

[0183] When the wire is burned, the roller 101 is in the constant tension mode, and moves in the horizontal direction while rotating, so as to ensure that the wire is uniformly arranged on the roller 101.

[0184] When the wire is burned, the roller 101 is in the constant tension mode, and moves in the horizontal direction while rotating, so as to ensure that the wire is uniformly arranged on the roller 101. When the wire is burned, the roller 101 is in the constant tension mode, and moves in the horizontal direction while rotating, so as to ensure that the wire is uniformly arranged on the roller 101.

[0185] The automatic wire burning and threading device for medium-speed wire feeding provided in the application is characterized in that a first motor, a synchronous belt, a pulley, a lead screw, a rotatable nut, a first gear, a second gear and a second motor are arranged; the first motor is arranged to drive the rotation of the roller and is fixedly connected with the roller; the pulley is connected with the roller through the synchronous belt; the lead screw is fixedly connected with the pulley; the rotatable nut is sleeved with the lead screw and moves along the axial direction when the rotatable nut rotates; the first gear is fixedly connected with the rotatable nut and rotates coaxially with the rotatable nut; the second gear is engaged with the first gear; the second motor drives the rotation of the second gear and is fixedly connected with the second gear; when the roller rotates, the second gear is locked, so that the roller can realize two movement modes of rotation and translation at the same time, and the roller can return to the wire clamping position for wire clamping without affecting the tension of the electrode wire after tension adjustment.

[0186] Figure 10 FIG. 1 is a structural schematic diagram of an automatic wire burning and threading device for medium-speed wire feeding provided in some embodiments of the application, Figure 11 FIG. 2 is a structural schematic diagram of a wire threading assembly provided in some embodiments of the application. Based on the above embodiments, further, Figure 10 The automatic wire burning and threading device for medium-speed wire feeding provided in the application further comprises a wire threading assembly 600; as shown in FIG. 2, the wire threading assembly 600 comprises a second guide rail (not shown), a moving table 603, a first wire feeding wheel 601, a second wire feeding wheel 602, a first wire feeding wheel cylinder 604, a second wire feeding wheel cylinder 605, a first wire feeding wheel motor 606, a second wire feeding wheel motor 607 and a wire guide tube 608; Figure 11

[0187] The second guide rail is arranged on one side of the first guide wheel 501 and the upper guide 502 and extends in a direction parallel to the line connecting the first guide wheel 501 and the upper guide 502; the moving table 603 is arranged on the second guide rail and moves along the second guide rail between the first guide wheel 501 and the lower guide 503;

[0188] Specifically, the movement of the moving table 603 can drive the movement of the first wire feeding wheel 601, the second wire feeding wheel 602 and the wire guide tube 608 below the moving table, so as to shorten the length of the wire guide tube 608 and save materials. At the same time, the probability of the bending of the electrode wire in the wire guide tube is reduced, and the overlong wire guide tube 608 and the slight change of the direction of the electrode wire in the wire guide tube 608 are prevented, so as to prevent the moving electrode wire from cutting the wire guide tube 608.

[0189] The first wire feeding wheel 601 and the second wire feeding wheel 602 are arranged in the moving table 603 and are fixedly arranged on the top of the moving table 603 through the first wire feeding wheel motor 606 and the second wire feeding wheel motor 607;

[0190] ​Specifically, the first wire feeding wheel 601 is connected with the first wire feeding wheel motor 606 and fixed on the top of the moving table 603 through the first wire feeding wheel motor 606; the second wire feeding wheel 602 is connected with the second wire feeding wheel motor 607 and fixed on the top of the moving table 603 through the second wire feeding wheel motor 607. The first wire feeding wheel motor 606 and the second wire feeding wheel motor 607 can rotate around the fixed point, thereby driving the first wire feeding wheel 601 and the second wire feeding wheel 602 to move close to or away from each other. The electrode wire passes through the top of the moving table 603 and is located between the first wire feeding wheel 601 and the second wire feeding wheel 602. When the first wire feeding wheel 601 and the second wire feeding wheel 602 contact each other, the wire can be clamped and fed by rotating. The first wire feeding wheel 601 and the second wire feeding wheel 602 may, for example, be a ceramic wheel and a rubber wheel respectively to improve the friction, but the application is not limited thereto.

[0191] The first wire feeding wheel 601 and the second wire feeding wheel 602 in contact with each other can retract, feed out or clamp the wire. In normal working conditions, the first wire feeding wheel 601 and the second wire feeding wheel 602 can be controlled to move away from each other by the first wire feeding wheel motor 606 and the second wire feeding wheel motor 607, so as to prevent the wire moving at high speed from causing abrasion to the first wire feeding wheel 601 and the second wire feeding wheel 602. When the wire is burned, the first wire feeding wheel 601 and the second wire feeding wheel 602 can be controlled to contact each other to clamp and clamp the wire, so as to fix the position of the wire. If the upper guide 502 is an open-close guide, when the wire passes through the upper guide 502, the first wire feeding wheel 601 and the second wire feeding wheel 602 can be controlled to contact each other to clamp and fix the position of the wire after the moving table 603 drives the guide wire tube 608 to move above the upper guide 502, so as to prevent the wire from being clamped by the end face when the upper guide 502 is closed.

[0192] The first wire feeding wheel cylinder 604 is connected with the first wire feeding wheel 601; the second wire feeding wheel cylinder 605 is connected with the second wire feeding wheel 602;

[0193] Specifically, the first wire feeding wheel cylinder 604 and the second wire feeding wheel cylinder 605 are both rotary cylinders, and when the first wire feeding wheel 601 and the second wire feeding wheel 602 contact each other, the first wire feeding wheel cylinder 604 and the second wire feeding wheel cylinder 605 rotate towards each other, thereby driving the first wire feeding wheel 601 and the second wire feeding wheel 602 to move up and down.

[0194] When the first wire feeding wheel 601 and the second wire feeding wheel 602 rotate downwards in contact with each other, the wire is also fed downwards; when the first wire feeding wheel 601 and the second wire feeding wheel 602 rotate upwards in contact with each other, the wire is also retracted upwards, thereby repeatedly threading the wire. The rotation direction of the first wire feeding wheel 601 and the first wire feeding wheel cylinder 604 is the same, and the rotation direction of the second wire feeding wheel 602 and the second wire feeding wheel cylinder 605 is the same.

[0195] The wire guide tube 608 is arranged at the bottom of the moving platform 603, and the wire enters the wire guide tube 608 from the opening at the bottom of the moving platform 603.

[0196] Specifically, the wire passes out from the bottom of the moving platform 603 and enters the wire guide tube 608. Since the wire used by the middle wire cutting machine is easy to bend, the wire direction can be restricted by arranging the wire guide tube 608, so that the wire moves in the correct position.

[0197] The automatic wire burning and threading device for the middle wire cutting machine provided in the application comprises a threading assembly, wherein the threading assembly comprises a second guide rail, a moving platform, a first wire feeding wheel, a second wire feeding wheel, a first wire feeding wheel air cylinder, a second wire feeding wheel air cylinder, a first wire feeding wheel motor, a second wire feeding wheel motor and a wire guide tube. The second guide rail is arranged at one side of the first guide wheel and the upper guide, and the extension direction is parallel to the line connecting the first guide wheel and the upper guide. The moving platform is arranged on the second guide rail and moves between the first guide wheel and the lower guide along the second guide rail. The first wire feeding wheel and the second wire feeding wheel are arranged in the moving platform and are fixed to the top of the moving platform by the first wire feeding wheel motor and the second wire feeding wheel motor respectively. The first wire feeding air cylinder is connected with the first wire feeding wheel, and the second wire feeding air cylinder is connected with the second wire feeding wheel. The wire guide tube is arranged at the bottom of the moving platform, and the wire enters the wire guide tube from the opening at the bottom of the moving platform. The automatic threading is realized, and the direction of the wire is strictly controlled during the threading process to avoid the failure of threading caused by the bending of the wire. At the same time, the wire can be partially retracted to repeatedly thread the wire, thereby greatly improving the success rate of threading, eliminating the need for manual threading by the staff, improving the threading efficiency and greatly reducing the operation complexity.

[0198] In some embodiments, as shown in FIG. 6, the threading assembly 600 further comprises a bending detection device 609 arranged in the moving platform 603 and located below the first wire feeding wheel 601 and the second wire feeding wheel 602. Figure 10

[0199] Specifically, the bending detection device 609 can be a metal ring arranged between the wire feeding wheel and the inlet of the wire guide tube 608. When the wire is vertically downward, it passes through the metal ring. When the wire is bent, it will touch the metal ring. At this time, the wire is short-circuited with the metal ring, the potential of the metal ring changes, and the detection of whether the wire is bent is realized by detecting the potential change of the metal ring.

[0200] By arranging the bending detection device 609, when the wire is bent and the threading fails, the first wire feeding wheel 601 and the second wire feeding wheel 602 can be controlled to stop feeding the wire, and the first wire feeding wheel 601 and the second wire feeding wheel 602 can be controlled to rotate reversely to retract the wire by a small segment and then thread the wire again.

[0201] In some embodiments, the threading assembly 600 further comprises a pressure sensor (not shown) arranged at the end of the wire guide tube 608. ​

[0202] Specifically, when the lower guide 503 is an integrated guide, the moving table 603 drives the guide wire tube 608 to move until the end of the guide wire tube 608 touches the lower guide 503, and then stops moving; when the lower guide 503 is an open-close guide, the moving table 603 drives the guide wire tube 608 to move until the end of the guide wire tube 608 touches the finger cylinder 303 of the wire feeding assembly 300, and then stops moving. By arranging a pressure sensor at the end of the guide wire tube 608, the pressure change can be detected when the end of the guide wire tube 608 touches the lower guide 503 or the finger cylinder 303, and then the moving table 603 is controlled to stop moving.

[0203] The application further realizes the automatic control of the moving table, and then realizes the truly automatic wire threading, reduces the working intensity of the staff, and improves the wire threading efficiency.

[0204] In some embodiments, the wire feeding assembly 300 further comprises a detection sheet (not shown) arranged on the rotating cylinder 302 for detecting the potential change of the finger cylinder.

[0205] Specifically, since the electrode wire is electrified, when the wire reaches the finger cylinder 303, the potential of the finger cylinder 303 and the rotating cylinder 302 will change, and the detection sheet can judge whether the wire reaches the finger cylinder 303 by detecting the potential change, so as to control the finger cylinder 303 to clamp the wire.

[0206] The application realizes the automatic control of the wire clamping of the finger cylinder by arranging the detection sheet to detect whether the wire reaches, and further improves the automation level and the wire threading efficiency.

[0207] In some embodiments, as shown in Figure 1 and Figure 10 , the wire feeding assembly 300 further comprises an insulating gasket 304 arranged on the first guide rail 301, and the rotating cylinder 302 is arranged on the gasket 304 and moves along with the gasket 304 in the direction of the first guide rail 301.

[0208] Specifically, by arranging the gasket 304, the movement of the rotating cylinder 302 and the finger cylinder 303 can be realized by controlling the movement of the gasket 304, so as to avoid the abrasion caused by the direct contact between the rotating cylinder 302 and the first guide rail 301. At this time, since the gasket 304 is insulating, when the wire reaches the finger cylinder 303, a potential difference is generated between the rotating cylinder 302 and the first guide rail 301, and the detection sheet can also detect whether the wire reaches by detecting the potential difference between the rotating cylinder 302 and the first guide rail 301. In addition, a preset threshold value can also be arranged, and only when the potential difference is greater than the threshold value and remains stable, it is considered that the wire reaches, so as to prevent the false action of the finger cylinder 303, and also avoid clamping the wire as soon as the wire reaches the finger cylinder 303, which may cause the clamping failure.

[0209] The application sets the insulating gasket to isolate the rotary cylinder from the guide rail, avoids the wear caused by the direct contact between the rotary cylinder and the guide rail, and can detect the arrival of the wire through a more stable potential difference detection wire, thereby improving the detection accuracy and the success rate of the wire clamping of the finger cylinder 303.

[0210] The use of the automatic wire burning and threading device provided by the embodiment will be described below. Figure 10 The embodiment provides a process for burning wire by the automatic wire burning and threading device. Figure 12 It is a flowchart of the automatic wire burning method provided by some embodiments of the application, which is different from Figure 5 The difference is that step S1205 is added, as shown in Figure 12 The automatic wire burning method provided by the application comprises the following steps:

[0211] S1201: Move the rotary cylinder 302 to the gap between the drum 101 and the lower arm 201, and open the rotary cylinder 302 and the finger cylinder 303;

[0212] Specifically, when electric spark machining is performed, the electrode wire is sent out from the drum 101, passes through the upper arm (not shown) and the lower arm 201, and then returns to the drum, so the rotary cylinder 302 can be moved to the gap between the drum 101 and the lower arm 201 to clamp the wire. The rotary cylinder 302 is opened to lift the finger cylinder 303 to touch the electrode wire, and the finger cylinder 303 is opened to open the fingers, so that the electrode wire is located between the fingers of the finger cylinder 303, and is ready for clamping.

[0213] S1202: After the wire feeding assembly 300 detects the electrode wire, the finger cylinder 303 is closed to clamp the wire;

[0214] Specifically, since the electrode wire has a point, when the finger cylinder 303 touches the electrode wire, the potential will change, so the electrode wire can be detected by detecting the change of the potential, and the detection of the electrode wire can also be realized by image recognition camera or observation of the staff. The specific way of detecting the electrode wire is not limited by the application. After detecting the electrode wire, it means that the electrode wire has been located between the fingers of the finger cylinder 303, and the fingers are closed by closing the finger cylinder 303. At this time, the finger cylinder 303 clamps the wire.

[0215] S1203: Control the clamping wire moving end face 102 to move away from the drum 101;

[0216] Specifically, according to the different structures of the drum assembly 100, the way of controlling the clamping wire moving end face 102 to move away from the drum 101 is also different. For example, when the separation unlocking device is provided, the separation unlocking device 107 can be opened, and the moving part 106 drives the clamping wire moving end face to move away from the drum 101 to release the wire.

[0217] S1204: Close the rotary cylinder 302, and move the rotary cylinder 302 away from the roller 101 by a preset distance;

[0218] Specifically, the closed rotary cylinder 302 lowers the finger cylinder 303 to reduce the height of the wire, and takes out the wire from between the wire clamping moving end face 102 and the roller 101. Then, the rotary cylinder 302 (or the gasket 304) is controlled to move away from the roller 101 by a preset distance, so as to prevent some electrode wires from being left between the wire clamping moving end face 102 and the roller 101, and ensure that the electrode wires are completely taken out. The preset distance can be set according to the diameter of the roller 101, the length of the lower arm 201, and other actual conditions, and the specific length of the preset distance is not limited in the present application.

[0219] S1205: Start the first wire feeding wheel motor 606 and the second wire feeding wheel motor 607, so that the first wire feeding wheel 601 and the second wire feeding wheel 602 contact each other;

[0220] Specifically, the first wire feeding wheel motor 606 and the second wire feeding wheel motor 607 are started to drive the first wire feeding wheel 601 and the second wire feeding wheel 602 to move towards each other, so that the first wire feeding wheel 601 and the second wire feeding wheel 602 clamp the wire in the middle, thereby fixing the position of the wire. At this time, when the upper guide 502 and the lower guide 503 are open-close guides, the upper open-close cylinder and the lower open-close cylinder can also be started to prepare for wire threading.

[0221] S1206: Apply a voltage between the first conductive block 204 and the second conductive block 205 to burn the wire.

[0222] Specifically, one end of the electrode wire is fixed on the roller 101, and the other end is clamped in the finger cylinder 303, so that the electrode wire has a certain tension. At this time, a voltage is applied between the first conductive block 204 and the second conductive block 205 to burn the wire, and the wire is pulled off under the action of tension, so that the diameter of the wire fracture is smaller than the original diameter of the wire, thereby improving the success rate of subsequent wire threading.

[0223] The middle wire automatic wire burning method provided by the present application moves the rotary cylinder to the position between the roller and the lower arm, and starts the rotary cylinder and the finger cylinder. After the wire threading assembly detects the electrode wire, the finger cylinder is closed to clamp the wire. The wire clamping moving end face is moved away from the roller. The rotary cylinder is closed, and the rotary cylinder is controlled to move away from the roller by a preset distance. The first wire feeding wheel motor and the second wire feeding wheel motor are started to make the first wire feeding wheel and the second wire feeding wheel contact each other. A voltage is applied between the first conductive block and the second conductive block to burn the wire, which realizes automatic wire burning and wire threading of the middle wire, greatly improves the success rate of wire threading, reduces the operation complexity of the staff, and further improves the mechanization level and the electric spark machining efficiency.

[0224] The following describes the use of Figure 10 The process of the automatic wire burning and threading device provided in the embodiments is described. Figure 13 FIG. 1 is a flowchart of the automatic wire threading method provided in some embodiments of the present application. The process can be controlled by a server or by a worker, as shown in FIG. 1. Figure 13 The automatic wire threading method provided in the present application includes the following steps.

[0225] S1301: Turn on the adapter plate cylinder 202 to drive the adapter plate 203 away from the lower guide 503.

[0226] Specifically, the lower guide 503 is arranged above the through hole of the lower arm 201. The adapter plate cylinder 202 is turned on to drive the adapter plate 203 to move away from the lower guide 503, so as to leave a position for the finger cylinder 303, so that the finger cylinder 303 can smoothly clamp the wire when the wire passes through the lower guide 503. At this time, the rotary cylinder 302 is in an open state to lift the finger cylinder 303, so that the finger cylinder 303 is closer to the lower guide 503, thereby reducing the length of free bending of the wire when using an integrated guide and improving the success rate of wire threading.

[0227] S1302: Control the moving table 603 to drive the guide tube 608 to move downward along the second guide rail.

[0228] Specifically, during the movement of the moving table 603, the first wire feeding wheel 601 and the second wire feeding wheel 602 are in contact with each other, so as to straighten the wire. By driving the guide tube 608 to move downward, the distance between the guide tube 608 and the lower guide 503 and the finger cylinder 303 is reduced, thereby reducing the possibility of wire bending and greatly improving the success rate of wire threading.

[0229] S1303: When the guide tube 608 contacts the lower guide 503 or the finger cylinder 303, control the finger cylinder 303 to open.

[0230] Specifically, when the lower guide 503 is an integrated guide, the guide tube 608 cannot pass through the lower guide 503, so it stops moving when it contacts the lower guide 503. When the lower guide 503 is an open-close guide, the lower guide 503 can be opened by the lower opening and closing cylinder, so that the guide tube 608 does not contact the lower guide 503. At this time, when the guide tube 608 contacts the finger cylinder 303, the moving table 603 stops moving. The pressure sensor installed at the bottom of the guide tube 608 can be used to detect whether the end of the guide tube 608 contacts other objects, so as to control the movement of the moving table 603. The pressure sensor can also be installed on the lower guide or the finger cylinder, or an image recognition camera can be used to identify the contact state, which is not limited in the present application.

[0231] S1304: opening the first wire feeding wheel cylinder 604 and the second wire feeding wheel cylinder 605 to drive the first wire feeding wheel 601 and the second wire feeding wheel 602 to rotate towards each other to feed the wire;

[0232] Specifically, when each component reaches the wire passing position, the first wire feeding wheel 601 and the second wire feeding wheel 602 are rotated to feed the wire to complete the wire passing. When the lower guide 503 is an open-close guide, the wire is fed to the finger cylinder 303; when the lower guide 503 is an integrated guide, the small hole on the guide often has little difference with the diameter of the electrode wire, otherwise the guide cannot play a guiding role, therefore, repeated wire passing is often needed. When the bending detection device 609 detects that the electrode wire is bent, or the worker observes that the wire passing fails, the first wire feeding wheel cylinder 604 and the second wire feeding wheel cylinder 605 drive the first wire feeding wheel 601 and the second wire feeding wheel 602 to rotate in the opposite direction to slightly retract the wire, and the wire passing is performed again.

[0233] S1305: after the finger cylinder 303 contacts the wire, the first wire feeding wheel cylinder 604, the second wire feeding wheel cylinder 605 and the finger cylinder 303 are closed.

[0234] Specifically, when the detection sheet detects that the finger cylinder 303 contacts the wire, or the worker observes that the finger cylinder 303 contacts the wire, the first wire feeding wheel cylinder 604 and the second wire feeding wheel cylinder 605 are closed to stop feeding the wire, and the finger cylinder 303 is closed to clamp the wire.

[0235] The automatic wire passing method provided in the application drives the adapter plate away from the lower guide by opening the adapter plate cylinder; controls the moving table to drive the wire guide tube to move downward along the second guide rail; controls the finger cylinder to open when the wire guide tube contacts the lower guide or the finger cylinder; opens the first wire feeding wheel cylinder and the second wire feeding wheel cylinder to drive the first wire feeding wheel and the second wire feeding wheel to rotate towards each other to feed the wire; after the finger cylinder contacts the wire, the first wire feeding wheel cylinder, the second wire feeding wheel cylinder and the finger cylinder are closed, which realizes fully automatic wire passing, and the worker does not need to operate, thereby greatly improving the mechanization level and the electric spark machining efficiency.

[0236] In an embodiment, as shown in FIG. 13B, after S1305, the method further includes: Figure 14

[0237] S1401: controlling the rotating cylinder 302 to move along the first guide rail 301 in the direction of the roller 101, and controlling the rotating cylinder 302 to rotate to gradually lower the height of the finger cylinder 303;

[0238] ​Specifically, the rotating cylinder 302 is controlled to move along the preset trajectory (for example, the edge of the adapter plate 203 can be set to a specific shape, so that the rotating cylinder moves along the edge of the adapter plate 203), and the height of the finger cylinder 303 is gradually lowered while moving, so that the electrode wire moves downward without horizontal movement. After moving a distance, the rotating cylinder 302 can be turned off. Then, the adapter plate cylinder 202 can be turned off, and the adapter plate 203 is moved to the lower side of the through hole to provide support for the electrode wire, guide the electrode wire, prevent the electrode wire from being abraded due to sudden change of direction, and even prevent the electrode wire from being broken. The rotating cylinder 302 continues to move towards the roller 101 after completing the direction change of the electrode wire, so as to send the wire to the roller 101.

[0239] S1402: Control the wire clamping moving end surface 102 to move away from the roller 101, and when the rotating cylinder 302 moves to the rear of the roller 101, turn on the rotating cylinder 302 to lift the finger cylinder 303;

[0240] Specifically, the roller 101 can be first controlled to move to the wire clamping position in a mode of only moving without rotating, and then the wire clamping moving end surface 102 is controlled to move away from the roller 101 to prepare for wire clamping. When the rotating cylinder 302 moves to the rear of the roller 101, the rotating cylinder 302 is turned on to lift the finger cylinder 303, so that the wire is lifted and located between the wire clamping moving end surface 102 and the roller 101.

[0241] S1403: Control the wire clamping moving end surface 102 to reset, turn on the finger cylinder 303 to release the wire, and turn off the rotating cylinder 302 and the finger cylinder 303.

[0242] Specifically, the wire clamping moving end surface 102 is reset to clamp the wire, the finger cylinder 303 is turned on to open the fingers, and the wire is released. The rotating cylinder 302 is turned off to lower the height of the finger cylinder 303, so that the wire is prevented from being stopped between the fingers of the finger cylinder 303. Then, the finger cylinder 303 is turned off, and the threading is completed.

[0243] The automatic wire threading method provided in the application controls the rotating cylinder to move along the first guide rail towards the roller, controls the rotating cylinder to rotate and gradually lower the height of the finger cylinder, controls the wire clamping moving end surface 102 to move away from the roller 101, turns on the rotating cylinder 302 to lift the finger cylinder 303 when the rotating cylinder 302 moves to the rear of the roller 101, controls the wire clamping moving end surface 102 to reset, turns on the finger cylinder 303 to release the wire, and turns off the rotating cylinder 302 and the finger cylinder 303. After the wire threading is successful, the wire is automatically sent to the roller and clamped, and the whole working process is fully automatic, which saves manpower and greatly improves the working efficiency of electric spark machining.

[0244] In an embodiment, as shown in FIG. 1, the wire threading device comprises a roller 101, a wire clamping moving end surface 102, a rotating cylinder 302, a finger cylinder 303, an adapter plate cylinder 202, and an adapter plate 203. Figure 15As shown, when the upper guide and the lower guide are open-close guides, after S1305, the method further comprises:

[0245] S1501: control the mobile station 603 to move upwards, and close the lower open-close cylinder.

[0246] Specifically, the mobile station 603 is controlled to move the guide wire tube 608, and when the guide wire tube 608 moves above the lower guide 503, the lower open-close cylinder is closed, and under the joint action of the guide wheel on the adapter plate and the first guide wheel, the wire enters the small hole of the lower guide 503 and is fixed.

[0247] S1502: after the mobile station 603 is reset, the upper open-close cylinder is closed.

[0248] Specifically, after the lower open-close cylinder is closed, the mobile station 603 is continuously controlled to move upwards until it returns to the original position, at which time, under the joint action of the guide wheel on the adapter plate, the lower guide, the first wire feeding wheel 601, the second wire feeding wheel 602 and the first guide wheel, the position of the wire is fixed, so that when the upper open-close cylinder is closed, the wire can smoothly enter the small hole of the upper guide 502 instead of being clamped by the end faces of the two parts.

[0249] The automatic wire threading method provided in the application controls the mobile station to move upwards, closes the lower open-close cylinder, resets the mobile station after the lower open-close cylinder is closed, and closes the upper open-close cylinder to complete the final reset. When the open-close guide is used, the wire threading is facilitated, the wire is prevented from being clamped by the end faces of the open-close guide, and the wire threading success rate is further improved.

[0250] In some embodiments, as shown in Figure 1 and Figure 10 The automatic wire threading device provided in the application further comprises a wire releasing detection electrode 402 arranged between the roller 101 and the lower arm 201 and higher than a horizontal tangent line of the lowermost end of the roller 101, and used for detecting whether the roller 101 rotates to a wire releasing position.

[0251] Specifically, as shown in Figure 2 When normal processing is performed, the wire is uniformly wound on the roller, one end is fixed on the screw nail 103 of the roller, the other end is fixed between the roller 101 and the wire clamping moving end face 102, and is clamped by the roller 101 and the wire clamping moving end face 102. At this time, as shown in Figure 16As shown in (a) of FIG. 10, the wire is tangent to the roller 101 and does not contact the wire releasing detection electrode 402. As the roller 101 rotates, the wire on the wire holder for processing gradually moves towards the wire clamping moving end face 102, and when the wire moves to the position closest to the wire clamping moving end face, since one end of the wire is clamped by the roller 101 and the wire clamping moving end face 102, as the roller 101 continues to rotate, only the wire is retracted, and no wire is released. At this time, the wire clamping position rotates to the side of the roller 101 close to the lower arm 201, and the positional relationship between the wire and the roller 101 is as shown in (b) of FIG. 10. Figure 16 As shown in (b) of FIG. 10, the wire contacts the wire releasing detection electrode 402, and since the electrode wire is electrified, the potential of the wire releasing detection electrode 402 changes, and the wire is detected.

[0252] When the wire releasing detection electrode 402 detects the wire, it indicates that the wire on the wire holder is located at the position closest to the wire clamping moving end face 102, i.e., the end closest to the wire. At this time, the control finger air cylinder 303 clamps the wire, which can ensure that the clamped position of the wire is closest to the end point of the wire, the waste wire produced by burning the wire is minimized, and the length of the wire is reduced, thereby reducing waste.

[0253] In some embodiments, as shown in Figure 1 and Figure 10 The automatic wire burning and threading device provided in the present application further comprises a wire clamping detection electrode 403 arranged on the side of the roller 101 away from the lower arm 201 and a horizontal tangent line higher than the lowermost end of the roller 101, for detecting whether the wire roller 101 can start clamping the wire.

[0254] Specifically, the wire clamping detection electrode 403 is arranged on the side of the roller 101 away from the lower arm 201, i.e., on the opposite side of the lower arm 201. When the wire contacts the wire clamping detection electrode 403, the potential of the wire clamping detection electrode 403 changes, thereby achieving detection of the wire. Since the position of the wire clamping detection electrode 403 is higher than the horizontal tangent line of the lowermost end of the roller 101, when the wire contacts the horizontal tangent line higher than the lowermost end of the roller 101, it indicates that the wire has been lifted to a position higher than the tangent line of the roller 101 behind the roller 101, and after the wire clamping moving end face 102 moves away from the roller 101, the wire can enter between the roller 101 and the wire clamping moving end face 102, thereby achieving wire clamping.

[0255] In addition, after the roller 101 clamps the wire, a voltage can be applied between the roller 101 and the wire clamping detection electrode 403 to burn the wire, thereby avoiding the interference of the excess wire outside the roller 101 on the rotation and translation of the roller 101.

[0256] In the description of the present application, it is to be understood by the skilled in the art that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated thereby. Therefore, the features defined with "first", "second", and the like can be explicitly or implicitly included one or more. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0257] The description of the terms "one embodiment", "one specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. The order of steps involved in each embodiment is used to illustrate the implementation of the present application, and the order of steps is not limited, and can be appropriately adjusted as needed.

[0258] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0259] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of the present application, and it should be understood that the above description is only for specific embodiments of the present application and does not limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A medium-speed wire automatic wire burning and threading device, characterized in that, The application relates to a wire feeding device for electric spark machining. The wire feeding device comprises a roller assembly (100), a wire burning assembly (200) and a wire feeding assembly (300). The roller assembly (100) comprises a roller (101) and a wire clamping moving end face (102), the wire clamping moving end face (102) is arranged at one end of the roller (101), and when electric spark machining is performed, a wire is wound around the roller (101) and clamped at one end between the roller (101) and the wire clamping moving end face (102). The wire burning assembly (200) comprises a lower arm (201), a switching plate air cylinder (202), a switching plate (203), a first conductive block (204) and a second conductive block (205). The lower arm (201) is arranged at one side of the roller (101) and extends in a direction perpendicular to the axial direction of the roller (101). The switching plate (203) is arranged at one end of the lower arm (201) away from the roller (101) through the switching plate air cylinder (202). The first conductive block (204) and the second conductive block (205) are arranged on the switching plate (203), and the first conductive block (204) is arranged above the second conductive block (205). The wire feeding assembly (300) comprises a first guide rail (301), a rotating air cylinder (302) and a finger air cylinder (303). The first guide rail (301) is arranged in parallel below the lower arm (201). The rotating air cylinder (302) is arranged on the first guide rail (301) and moves along the first guide rail (301). The finger air cylinder (303) is connected with the rotating air cylinder (302) and is lifted or lowered along with the rotating air cylinder (302) to clamp a wire. The roller assembly (100) further comprises: A first motor (111) for driving the roller (101) to rotate and fixedly connected with the roller (101); A synchronous belt (112) and a belt wheel (113), the belt wheel (113) is connected with the roller (101) through the synchronous belt (112); A lead screw (114) fixedly connected with the belt wheel (113); A rotatable nut (115) sleeved with the lead screw (114), when the rotatable nut (115) rotates, the lead screw (114) which does not rotate moves along the axial direction; A first gear (116) fixedly connected with the rotatable nut (115) and coaxially rotates with the rotatable nut (115); A second gear (117) engaged with the first gear (116); A second motor (118) for driving the second gear (117) to rotate and fixedly connected with the second gear (117), when the roller (101) rotates, the second motor (118) is locked.

2. The automatic wire threading device according to claim 1, wherein Further comprising: A guide assembly (500) comprising a first guide wheel (501), an upper guide (502) and a lower guide (503). The lower guide (503) is arranged at one end of the lower arm (201) away from the roller (101) and above the switching plate (203). The first guide wheel (501) is arranged above the lower guide (503); The upper guide (502) is arranged between the first guide wheel (501) and the lower guide (503).

3. The mid-speed automatic wire threading device according to claim 2, wherein When the lower guide (503) is an open-close guide, the guide assembly (500) further comprises: A lower open-close cylinder is arranged on both sides of the lower guide to control the opening and closing of the lower guide by moving.

4. The automatic wire threading device according to claim 2, wherein When the upper guide (502) is an open-close guide, the guide assembly (500) further comprises: An upper open-close cylinder is arranged on both sides of the upper guide to control the opening and closing of the upper guide by moving.

5. The mid-speed automatic wire threading device according to claim 2, wherein The guide assembly further comprises: A second guide wheel (504) is arranged on the adapter plate (203) below the first conductive block (204) and the second conductive block (205); A third guide wheel (505) is arranged above the lower arm (201).

6. The mid-speed automatic wire threading device according to claim 2, wherein Further comprising: a wire threading assembly (600); the wire threading assembly (600) comprises: a second guide rail, a moving table (603), a first wire feeding wheel (601), a second wire feeding wheel (602), a first wire feeding wheel cylinder (604), a second wire feeding wheel cylinder (605), a first wire feeding wheel motor (606), a second wire feeding wheel motor (607), and a wire guide tube (608); The second guide rail is arranged on one side of the first guide wheel (501) and the upper guide (502), and the extension direction is parallel to the line connecting the first guide wheel (501) and the upper guide (502); The moving table (603) is arranged on the second guide rail and moves along the second guide rail between the first guide wheel (501) and the lower guide (503); The first wire feeding wheel (601) and the second wire feeding wheel (602) are arranged in the moving table (603) and are fixed to the top of the moving table (603) by the first wire feeding wheel motor (606) and the second wire feeding wheel motor (607), respectively; The first wire feeding wheel cylinder (604) is connected with the first wire feeding wheel (601), and the second wire feeding wheel cylinder (605) is connected with the second wire feeding wheel (602); The wire guide tube (608) is arranged at the bottom of the moving table (603), and the wire enters the wire guide tube (608) from the opening at the bottom of the moving table (603).

7. The mid-speed automatic wire threading device according to claim 6, wherein The wire threading assembly (600) further comprises: a bending detection device (609) arranged in the moving table (603) below the first wire feeding wheel (601) and the second wire feeding wheel (602).

8. The mid-speed automatic wire threading device according to claim 6, wherein The wire threading assembly (600) further comprises: a pressure sensor arranged at the end of the wire guide tube (608).

9. The automatic wire threading device of claim 1, wherein, The wire feeding assembly (300) further comprises: a detection sheet arranged on the rotating cylinder (302) to detect the potential change of the finger cylinder.

10. The mid-speed automatic wire threading device of claim 1, wherein, The wire feeding assembly (300) further comprises: an insulating gasket (304) arranged on the first guide rail (301); The rotating cylinder (302) is arranged on the gasket (304) and moves along the first guide rail (301) with the gasket (304).

11. The automatic wire threading device of claim 1, wherein, Further comprising: A wire feeding detection electrode (402) is arranged between the roller (101) and the lower arm (201) and is higher than a horizontal tangent line of the lowermost end of the roller (101), and is used to detect whether the roller (101) is rotated to a wire feeding position.

12. The automatic wire threading device of claim 1, wherein, Further comprising: A wire clamping detection electrode (403) is arranged on a side of the roller (101) away from the lower arm (201) and is higher than a horizontal tangent line of the lowermost end of the roller (101), and is used to detect whether the wire roller (101) can start clamping the wire.

13. The automatic wire threading device of claim 1, wherein, Further comprising: A tension wheel guide rail is arranged above the lower arm (201) and is parallel to the lower arm (201); A tension wheel (401) is arranged on the tension wheel guide rail, moves along the tension wheel guide rail, and adjusts the tension of the wire.

14. The automatic wire threading device of claim 1, wherein, The roller assembly (100) further comprises: A wire clamping fixed end surface (104) is fixed to one end of the roller (101); A limiting piece (105) comprises a protruding part (1051) and a limiting part (1052), the protruding part (1051) is fixedly connected with the wire clamping fixed end surface (104), and the limiting part (1052) has a gap with the wire clamping fixed end surface (104); the wire clamping moving end surface (102) is arranged in the gap; A moving piece (106) is arranged on a side of the limiting piece (105) away from the roller (101) and is fixedly connected with the wire clamping moving end surface (102); A separation unlocking device (107) is used to control the movement of the moving piece (106); A bearing (108) passes through the roller (101), the wire clamping fixed end surface (104), the limiting piece (105), the wire clamping moving end surface (102), the moving piece (106) and the separation unlocking device (107) and is fixedly connected with the roller (101).

15. The mid-speed automatic wire threading device of claim 14, wherein, The roller assembly (100) further comprises a spring (110) arranged between the limiting part (1052) of the limiting piece (105) and the wire clamping moving end surface (102).

16. A method for automatic wire burning in a medium-speed wire EDM machine, implemented by the automatic wire burning and threading device according to any one of claims 1-15, characterized in that, Comprising: The rotating cylinder (302) is moved to between the roller (101) and the lower arm (201), and the rotating cylinder (302) and the finger cylinder (303) are opened; After the electrode wire is detected by the wire feeding assembly (300), the finger cylinder (303) is closed to clamp the wire; The wire clamping moving end surface (102) is controlled to move away from the roller (101); The rotating cylinder (302) is closed and moved away from the roller (101) by a preset distance; A voltage is applied between the first conductive block (204) and the second conductive block (205) to burn the wire.

17. The mid-wire feed automatic wire burning method according to claim 16, wherein After the voltage is applied between the first conductive block (204) and the second conductive block (205) to burn the wire, further comprising: The rotating cylinder (302) is moved to one end of the first guide rail (301) close to the roller (101), and the rotating cylinder (302) and the finger cylinder (303) are opened to discard the waste silk.

18. The mid-speed WWS automatic wire burning method according to claim 16, characterized in that, The rotating cylinder (302) is moved to one end of the first guide rail (301) close to the roller (101), and the rotating cylinder (302) and the finger cylinder (303) are opened to discard the waste silk. The rotating cylinder (302) is moved to one end of the first guide rail (301) close to the roller (101), and the rotating cylinder (302) and the finger cylinder (303) are opened to discard the waste silk.

19. A method of automatic threading of a medium-speed wire, implemented on the basis of a medium-speed wire automatic threading device according to any one of claims 6-8, characterized in that, The rotating cylinder (302) is moved to one end of the first guide rail (301) close to the roller (101), and the rotating cylinder (302) and the finger cylinder (303) are opened to discard the waste silk. The adapter plate cylinder (202) is opened to drive the adapter plate (203) away from the lower guide (503). The moving table (603) is controlled to drive the guide tube (608) to move downward along the second guide rail. When the guide tube (608) contacts the lower guide (503) or the finger cylinder (303), the finger cylinder (303) is opened. The first and second silk feeding wheel cylinders (604) and (605) are opened to drive the first and second silk feeding wheels (601) and (602) to rotate towards each other for silk feeding. After the finger cylinder (303) contacts the silk, the first and second silk feeding wheel cylinders (604) and (605) and the finger cylinder (303) are closed.

20. The automatic wire threading method of claim 19, wherein, After the first and second silk feeding wheel cylinders (604) and (605) and the finger cylinder (303) are closed, the rotating cylinder (302) is controlled to move along the first guide rail (301) towards the roller, and rotates at the same time to gradually lower the height of the finger cylinder (303). The rotating cylinder (302) is moved to one end of the first guide rail (301) close to the roller (101), and the rotating cylinder (302) and the finger cylinder (303) are opened to discard the waste silk. The rotating cylinder (302) is moved to one end of the first guide rail (301) close to the roller (101), and the rotating cylinder (302) and the finger cylinder (303) are opened to discard the waste silk. ​

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