Numerical control wire feeding mechanism for automatic wire threading CNC electric discharge wire cutting machine

Abstract

A numerical control wire feeding mechanism for an automatic wire threading CNC wire cut electric discharge machine tool, comprising a substrate, a wire feeding wheel mechanism and a pressure wheel mechanism. The wire feeding wheel mechanism includes a wire feeding wheel, a wire feeding wheel shaft, a driving gear and a wire feeding wheel driving mechanism. The pressure wheel mechanism includes a pressure wheel, a pressure wheel shaft and a driven gear. It is characterized in that: a double swing arm automatic opening and closing mechanism, which includes a main swing arm, a secondary swing arm, a main rotating swing shaft, a secondary rotating swing shaft, a main push rod, a secondary push rod, a push and pull block, a push and pull power mechanism and an elastic component. This solution can accurately feed the wire feeding wheel to a fixed wire feeding position, ensuring the certainty of the wire feeding center position. Moreover, the pressure of the pressure wheel on the electrode wire during wire feeding can be adjusted by adjusting screws to meet the requirements of automatic wire feeding. It overcomes the defects of the prior art, such as the uncertainty of the wire feeding position, the inconvenience of adjusting the wire feeding pressure, the easy slippage between the wire feeding wheel and the electrode wire during the wire feeding process, and the unreliable wire feeding.

Description

Technical Field

[0001] The present invention relates to the technical field of wire electrical discharge machining, and particularly relates to a numerical control wire feeding mechanism for an automatic wire threading numerical control wire electrical discharge machining machine tool. Background Art

[0002] The numerically controlled reciprocating wire electrical discharge machining machine tool (abbreviation: wire electrical discharge machining machine tool) is widely used as a metal cutting processing equipment in the processing of precision and complex-shaped parts in manufacturing industries such as molds, aerospace, automobiles, energy, precision instruments, medical devices, and electronic products, and occupies an important position in industrial production. Wire electrical discharge machining uses a continuously moving thin metal wire (referred to as the electrode wire) as the electrode to perform pulsed spark discharge on the workpiece to erode metal and cut into shape. Wire threading is required before or during wire electrical discharge machining. At present, the vast majority of wire electrical discharge machining machine tools can only use manual wire threading. Manual wire threading is highly professional, requires professional personnel to operate, and has a complex process, high requirements, large workload, and low efficiency. Therefore, in recent years, technicians in this field have been working hard to research and develop a fully automatic wire threading device and method applicable to wire electrical discharge machining machine tools. Fully automatic wire threading is a complex and meticulous systematic project in the technical field of wire electrical discharge machining, with high process requirements, many difficulties, and great technical difficulties. It has long been a technical problem in this field. Among them, how to meet the requirements of stability, reliability, and control in the wire feeding mechanism during automatic wire threading is one of the technical difficulties to be overcome.

[0003] Chinese Patent CN218694675U discloses a utility model patent titled "An Automatic Wire Threading Device for a Wire Cutting Machine Tool". The upper wire threading mechanism described in this patent is the wire feeding mechanism, which is mainly composed of a first clamping assembly, a rotating member, and a first driving assembly. Among them, the first clamping assembly consists of a first clamping plate and a second clamping plate. The first clamping plate and the second clamping plate are cross - arranged and rotatably connected at the intersection by a first rotating shaft. At the top of the first clamping plate, there is a first clamping member (the first wire feeding wheel), and at the top of the second clamping plate, there is a second clamping member (the second wire feeding wheel). There is a first space between the bottoms of the first clamping plate and the second clamping plate. The rotating member is an elliptical wheel driven by a first rotary cylinder. The elliptical wheel is arranged in the first space. When the first rotary cylinder drives the elliptical wheel to rotate to the first state, the first clamping member and the second clamping member are separated from each other. When the first rotary cylinder drives the elliptical wheel to rotate to the second state, the first clamping member and the second clamping member approach each other and can clamp the electrode wire. The first driving assembly consists of a first driving gear, a first driven gear, and a first driving motor. When the first clamping member and the second clamping member are in the second state, the first driving assembly drives the first clamping member and the second clamping member to rotate synchronously in opposite directions, thereby driving the electrode wire to move for wire feeding. The above - mentioned upper wire threading mechanism, as an automatic wire threading wire feeding mechanism, has the following deficiencies: First, the position of the wire feeding wheel is unstable and prone to deviation, resulting in an uncertain wire feeding position and affecting the wire feeding effect. Second, it is inconvenient to adjust the wire feeding pressure. Third, during the wire feeding process, it is easy for the wire feeding wheel to slip relative to the electrode wire, and the wire feeding is unreliable. Summary of the Invention

[0004] The present invention provides a numerical control wire feeding mechanism for an automatic wire threading numerical control wire - cut electric discharge machine tool, aiming to improve the stability, reliability, and control accuracy of the wire feeding mechanism, thereby solving the problem that the existing wire feeding mechanism cannot meet the requirements of stability, reliability, and control for full - automatic wire threading.

[0005] To achieve the above - mentioned purpose, the technical solution adopted by the present invention is: A numerical control wire feeding mechanism for an automatic wire threading numerical control wire - cut electric discharge machine tool, including a substrate, a wire feeding wheel mechanism, and a pressure wheel mechanism, where:

[0006] When observing the numerical control wire feeding mechanism from the front, taking the substrate as the base, the length direction of the electrode wire feeding or retracting section is defined as the Z - axis direction, the left - right direction is the X - axis direction, and the front - back direction is the Y - axis direction.

[0007] The wire feeding wheel mechanism, as the driving mechanism, includes a wire feeding wheel, a wire feeding wheel shaft, a driving gear, and a wire feeding wheel driving mechanism. The wire feeding wheel and the driving gear are coaxially and fixedly connected to the wire feeding wheel shaft. The wire feeding wheel driving mechanism is a rotational driving mechanism, and the output end of this rotational driving mechanism is in transmission connection with the wire feeding wheel shaft and can drive the wire feeding wheel to rotate forward or backward around the axis of the wire feeding wheel shaft.

[0008] The press wheel mechanism, as a driven mechanism, includes a press wheel, a press wheel shaft, and a driven gear. The press wheel and the driven gear are coaxially and fixedly connected to the press wheel shaft.

[0009] The driving gear and the driven gear have the same number of teeth and the same pitch circle diameter. The outer diameters of the wire feeding wheel and the press wheel are the same as the pitch circle diameters of the driving gear and the driven gear.

[0010] Its innovation lies in that: the numerical control wire feeding mechanism includes a double swing arm automatic opening and closing mechanism, and the double swing arm automatic opening and closing mechanism includes a main swing arm, a sub-swing arm, a main rotating swing shaft, a sub-rotating swing shaft, a main push rod, a sub-push rod, a push-pull block, a push-pull power mechanism, and an elastic component, where:

[0011] Centering on the electrode wire in the feeding or retracting section, one of the main swing arm and the sub-swing arm is arranged on the left side of the center, and the other is arranged on the right side of the center.

[0012] The main rotating swing shaft and the main push rod are correspondingly arranged on one side of the main swing arm, and the sub-rotating swing shaft and the sub-push rod are correspondingly arranged on one side of the sub-swing arm. One of the main rotating swing shaft and the main push rod is arranged above the other. When the main rotating swing shaft is above the main push rod, the sub-rotating swing shaft is below the sub-push rod, and when the main rotating swing shaft is below the main push rod, the sub-rotating swing shaft is above the sub-push rod.

[0013] The main swing arm is swingably connected to the substrate through the main rotating swing shaft, and the sub-swing arm is swingably connected to the substrate through the sub-rotating swing shaft. The main push rod is fixedly connected to the main swing arm, and the sub-push rod is fixedly connected to the sub-swing arm. The axes of the main rotating swing shaft, the main push rod, the sub-rotating swing shaft, and the sub-push rod are all parallel to the Y-axis direction.

[0014] The push-pull block is of a plate structure. The push-pull block is provided with a slot for pushing and pulling at a position corresponding to the main push rod. In the assembled state, the main push rod is placed in the slot. The width of the slot is the same as the diameter of the main push rod, and the two long faces of the slot are parallel to the axis of the main push rod. The push-pull block is provided with a pushing surface or a pulling surface at a position corresponding to the sub-push rod, and the pushing surface or the pulling surface is parallel to the axis of the sub-push rod.

[0015] The push-pull power mechanism is a linear drive mechanism and is installed on the substrate. The push-pull power mechanism has a push-pull drive end, and the push-pull drive end is fixedly or positioned connected to the push-pull block.

[0016] The elastic component is arranged and acts between the sub-swing arm and the substrate. The elastic force of the elastic component forces the sub-swing arm to drive the press wheel to swing towards the wire feeding wheel around the axis of the sub-rotating swing shaft.

[0017] In the assembled state, the whole wire feeding wheel mechanism is positioned and installed on the main swing arm. Among them, the wire feeding wheel shaft in the wire feeding wheel mechanism is rotatably supported on the main swing arm, the axis of the wire feeding wheel shaft is parallel to the Y-axis direction, and the wire feeding wheel driving mechanism is positioned and installed relative to the main swing arm. The whole pressure wheel mechanism is positioned and installed on the auxiliary swing arm. Among them, the pressure wheel shaft in the pressure wheel mechanism is rotatably supported on the auxiliary swing arm, and the axis of the pressure wheel shaft is parallel to the Y-axis direction. The axis of the wire feeding wheel shaft and the axis of the pressure wheel shaft are at the same height position in the Z-axis direction and are at corresponding positions in the Y-axis direction. The driving gear in the wire feeding wheel mechanism and the driven gear in the pressure wheel mechanism are at the same position in the Y-axis direction and mesh with each other, and the outer cylindrical generatrices of the wire feeding wheel in the wire feeding wheel mechanism and the pressure wheel in the pressure wheel mechanism are pressed against each other.

[0018] In the working state, the push-pull driving end of the push-pull power mechanism in the double swing arm automatic opening and closing mechanism has two working states of pushing and pulling. In the first working state, the slot hole on the push-pull block forces the main push rod to drive the main swing arm and the wire feeding wheel to swing inwards around the main swing axis, so that the wire feeding wheel reaches the wire feeding position. At the same time, the elastic component forces the auxiliary swing arm and the pressure wheel to swing inwards around the auxiliary swing axis, so that the outer cylindrical generatrix of the wire feeding wheel is pressed against the outer cylindrical generatrix of the pressure wheel. At the same time, the driving gear and the driven gear are engaged. When the wire feeding wheel driving mechanism drives the wire feeding wheel to rotate forward or backward through the wire feeding wheel shaft, due to the engagement of the driving gear and the driven gear, the pressure wheel is synchronously driven to rotate backward or forward. At this time, the electrode wire is clamped between the wire feeding wheel and the pressure wheel, and the electrode wire can be rolled to drive the feeding or retraction of the electrode wire. In the second working state, the slot hole on the push-pull block forces the main push rod to drive the main swing arm and the wire feeding wheel to swing outwards around the main swing axis. At the same time, the push surface or the pull surface on the push-pull block forces the auxiliary swing arm and the pressure wheel to swing outwards around the auxiliary swing axis against the elastic force of the elastic component, so that the wire feeding wheel and the pressure wheel are opened and in a non-wire feeding state.

[0019] The relevant content in the above technical solution is explained as follows:

[0020] 1. In the above solution, the "main swing arm and the wire feeding wheel swing inwards around the main swing axis" means that the main swing arm and the wire feeding wheel swing towards the auxiliary swing arm and the pressure wheel, and the "auxiliary swing arm and the pressure wheel swing inwards around the auxiliary swing axis" means that the auxiliary swing arm and the pressure wheel swing towards the main swing arm and the wire feeding wheel. The outward swing direction is opposite to the inward swing direction.

[0021] 2. In the above solution, the main swing axis is arranged above the main push rod, and the auxiliary swing axis is located below the auxiliary push rod.

[0022] 3. In the above solution, the main swing axis is arranged below the main push rod, and the auxiliary swing axis is located above the auxiliary push rod.

[0023] 4. In the above solution, the elastic component is a compression spring. For the compression spring, screw adjustment holes and adjustment screws are provided on the substrate. The screw adjustment holes are opened along the elastic force direction of the elastic component and have internal thread segments. In the assembled state, the compression spring is inserted into the screw adjustment holes, and the adjustment screws are engaged with the thread segments of the screw adjustment holes. One end of the compression spring acts directly or indirectly on the secondary swing arm, and the other end of the compression spring abuts against the adjustment screws. Rotating the adjustment screws can adjust the wire feeding pressure of the wire feeding wheel on the wire guiding wheel.

[0024] 5. In the above solution, the line connecting the center of the outer circle of the secondary push pin and the center of the outer circle of the secondary swing shaft is parallel to the pushing surface or the pulling surface, or the angle between the line connecting the center of the outer circle of the secondary push pin and the center of the outer circle of the secondary swing shaft and the pushing surface or the pulling surface is an acute angle.

[0025] 6. In the above solution, when the wire feeding wheel and the wire guiding wheel are in an open state, the driving gear and the driven gear are in a semi-engaged state with each other and have not completely disengaged.

[0026] 7. In the above solution, the wire feeding wheel shaft in the wire feeding wheel mechanism is rotationally supported on the main swing arm through a first bearing and a first bearing seat. Among them, the wire feeding wheel shaft is rotationally connected to the first bearing seat through the first bearing, and the first bearing seat is fixedly connected to the main swing arm. The wire guiding wheel shaft in the wire guiding wheel mechanism is rotationally supported on the secondary swing arm through a second bearing and a second bearing seat. Among them, the wire guiding wheel shaft is rotationally connected to the second bearing seat through the second bearing, and the second bearing seat is fixedly connected to the secondary swing arm.

[0027] 8. In the above solution, dehumidifying and cleaning air nozzles are provided above the wire feeding wheel and the wire guiding wheel. There are two groups of air nozzles for the dehumidifying and cleaning air nozzles. Among them, one group of air nozzles faces downward and is aligned with the outer cylindrical surface outside the wire feeding wheel, and the other group of air nozzles faces downward and is aligned with the outer cylindrical surface outside the wire guiding wheel. The two groups of air nozzles are connected to the air source through a channel and a pipe joint.

[0028] 9. In the above solution, both groups of air nozzles adopt slit-shaped nozzles. The length direction of the slit-shaped nozzles is parallel to the axis of the wire feeding wheel and the axis of the wire guiding wheel. Among them, the inward extension surface of one group of slit-shaped nozzles is inclined and tangent to the outer cylindrical surface of the wire feeding wheel, and the inward extension surface of the other group of slit-shaped nozzles is inclined and tangent to the outer cylindrical surface of the wire guiding wheel.

[0029] 10. In the above solution, the set of slit nozzles and the other set of slit nozzles mainly consist of a gas nozzle seat and two gas slit combination blocks. Among them, a gas channel is provided in the gas nozzle seat, and an air inlet leading to the gas source is provided on the gas nozzle seat, and the air inlet is communicated with the gas channel. The gas nozzle seat is respectively provided with a first splicing interface on one side corresponding to the wire feeding wheel and one side corresponding to the pressure wheel. A second splicing interface is provided on the gas slit combination block corresponding to the first splicing interface. In the assembled state, one gas slit combination block is assembled on one side of the wire feeding wheel, and a pair of first splicing interfaces and the second splicing interfaces are spliced to form a knife-shaped gas slit. The other gas slit combination block is assembled on one side of the pressure wheel, and the other pair of first splicing interfaces and the second splicing interfaces are spliced to form another knife-shaped gas slit.

[0030] 11. In the above solution, the two sets of gas nozzles both adopt circular nozzles. Each set of circular nozzles consists of a number of spray holes spaced along the axis of the wire feeding wheel and the axis of the pressure wheel. Among them, the axis of each spray hole in one set of circular nozzles is obliquely tangent to the outer cylindrical surface of the wire feeding wheel. The axis of each spray hole in the other set of circular nozzles is obliquely tangent to the outer cylindrical surface of the pressure wheel.

[0031] 12. In the above solution, the wire feeding wheel driving mechanism consists of a first belt pulley, a second belt pulley, a synchronous belt and a servo motor. Among them, the servo motor is fixedly connected to the main swing arm through a motor seat. The axis of the motor shaft of the servo motor is parallel to the axis of the wire feeding wheel shaft. The motor shaft is coaxially fixedly connected to the first belt pulley. The first belt pulley is connected to the second belt pulley through a synchronous belt, and the second belt pulley is fixedly connected to the wire feeding wheel shaft.

[0032] 13. In the above solution, the wire feeding wheel driving mechanism consists of a gear transmission mechanism and a servo motor, or the wire feeding wheel shaft is directly driven by a servo motor.

[0033] 14. In the above solution, the pushing and pulling power mechanism adopts a cylinder. The cylinder block of the cylinder is fixedly connected to the substrate, and the extending end of the shaft of the cylinder is fixedly connected to the pushing and pulling block. The axis of the cylinder is perpendicular to the axis of the wire feeding wheel in space.

[0034] 15. In the above solution, the pushing and pulling power mechanism is an electromagnet, a cam mechanism, a rack and pinion mechanism, a lever mechanism or a crank and connecting rod mechanism.

[0035] 16. In the above solution, the outer ring of the wire feeding wheel is made of a hard material, and minute grooves are made axially on the outer cylindrical surface of the wire feeding wheel. The minute grooves are evenly spaced circumferentially on the outer circumference of the wire feeding wheel to increase the wire feeding force during wire feeding. The outer ring of the pressure wheel is made of a soft material with a relatively large coefficient of friction to increase the wire feeding force during wire feeding.

[0036] Due to the application of the above solution, the present invention has the following substantial features and effects compared with the prior art:

[0037] 1. The present invention adopts a specific double swing arm automatic opening and closing mechanism. Not only are the wire feeding wheel and the pressure wheel arranged correspondingly on the main swing arm and the auxiliary swing arm, but also they are ingeniously combined through the main push rod, the auxiliary push rod, the push-pull block and the push-pull power mechanism to realize the opening and closing of the wire feeding wheel and the pressure wheel. Its structural design is reasonable, the mechanism is simple and reliable, and the control is convenient.

[0038] 2. During the closing process of the wire feeding wheel and the pressure wheel of the double swing arm automatic opening and closing mechanism of the present invention, the wire feeding wheel can be accurately fed by the push-pull power mechanism (cylinder) and the push-pull block to the fixed wire feeding position, ensuring the certainty of the wire feeding center position, and overcoming the problems in the prior art that the position of the wire feeding wheel is unstable, easy to shift, resulting in an uncertain wire feeding position and affecting the wire feeding effect.

[0039] 3. Through the cooperation of the double swing arm automatic opening and closing mechanism and the elastic component (spring) of the present invention, when the wire feeding wheel reaches the wire feeding center position, the pressure wheel is pushed and pressed by the elastic force provided by the elastic component. This not only ensures the certainty of the wire feeding center position, but also can adjust the pressure of the pressure wheel on the electrode wire during wire feeding by rotating the adjusting screw to meet the requirements of automatic wire feeding. It overcomes the defects in the prior art that it is inconvenient to adjust the wire feeding pressure, the wire feeding wheel and the electrode wire are easy to slip during the wire feeding process, and the wire feeding is unreliable.

[0040] 4. The outer ring of the wire feeding wheel of the present invention is made of hard material, and axial micro-grooves are made on the outer circular surface. The outer ring of the pressure wheel is made of soft material with a large friction coefficient, which improves the pressure of the wire feeding wheel and the reliability of wire feeding.

[0041] 5. The present invention designs a dehumidifying and cleaning air nozzle to realize the blowing and removal of the adhered working fluid and machining erosion products on the wire feeding wheel and the pressure wheel, ensuring the reliability of wire feeding. In particular, the dehumidifying and cleaning air nozzle adopts two groups of slit-shaped nozzles or circular nozzles arranged in a linear pattern and obliquely downwardly aligned with the outer cylindrical surfaces on the outer sides of the wire feeding wheel and the pressure wheel respectively for blowing, obtaining a remarkable cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Attached Figure 1 is the front view of the numerical control wire feeding mechanism according to the embodiment of the present invention.

[0043] Attached Figure 2 is the top view of the numerical control wire feeding mechanism according to the embodiment of the present invention.

[0044] Attached Figure 3 is the left view of the numerical control wire feeding mechanism according to the embodiment of the present invention.

[0045] Attached Figure 4 is the rear view of the numerical control wire feeding mechanism according to the embodiment of the present invention.

[0046] Attached Figure 5 is Figure 1 the A-A sectional view of

[0047] Attached Figure 6 is Figure 1 the B-B cross-sectional view of

[0048] Attached Figure 7 is Figure 4 the C-C cross-sectional view of

[0049] Attached Figure 8 is Figure 4 the D-D cross-sectional view of

[0050] Attached Figure 9 is Figure 1 the G-G cross-sectional view of

[0051] Attached Figure 10 is the front view of the dehumidifying clean air nozzle in the embodiment of the present invention.

[0052] Attached Figure 11 is the top view of the dehumidifying clean air nozzle in the embodiment of the present invention.

[0053] Attached Figure 12 is Figure 11 the E-E cross-sectional view of

[0054] Attached Figure 13 is Figure 12 the enlargement at F in

[0055] In the above figures: 1. Substrate; 2. Wire feeding wheel; 3. Pressure wheel; 4. Wire feeding wheel shaft; 5. Pressure wheel shaft; 6. Driving gear; 7. Driven gear; 8. Main swing arm; 9. Sub swing arm; 10. Main rotating swing shaft; 11. Sub rotating swing shaft; 12. Main push rod; 13. Sub push rod; 14. Push and pull block; 15. Electrode wire; 16. Slot hole; 17. Pushing surface or pulling surface; 18. Cylinder; 19. First bearing; 20. First bearing seat; 21. Second bearing; 22. Second bearing seat; 23. First belt pulley; 24. Second belt pulley; 25. Synchronous belt; 26. Servo motor; 27. Air nozzle seat; 28. Air slot combination block; 29. Flap; 30. Air channel; 31. Knife-shaped air slot; 32. Air inlet; 33. Elastic component; 34. Pre-guide tube; 35. Pre-guide nozzle; 36. First air joint; 37. Second air joint; 38. Adjusting screw; 39. Screw adjusting hole. Specific implementation mode

[0056] The present invention will be further described below with reference to the drawings and embodiments:

[0057] Embodiment: A numerical control wire feeding mechanism for an automatic wire threading CNC wire cut electric discharge machine.

[0058] As Figures 1 - 13 shown, the numerical control wire feeding mechanism includes a substrate 1, a wire feeding wheel mechanism and a pressure wheel mechanism, wherein:

[0059] Observed from the front of the numerically controlled wire feeding mechanism ( Figure 1 which is the front view for front observation), taking the substrate 1 as the base, the length direction of the feeding or retracting section of the electrode wire 15 (see Figure 1 ) is defined as the Z-axis direction, the left-right direction is the X-axis direction, and the front-back direction is the Y-axis direction.

[0060] The wire feeding wheel mechanism, as the driving mechanism, includes a wire feeding wheel 2 (see Figure 1 ), a wire feeding wheel shaft 4 (see Figure 1 ), a driving gear 6 (see Figure 4 ), and a wire feeding wheel driving mechanism. The wire feeding wheel 2 and the driving gear 6 are coaxially and fixedly connected to the wire feeding wheel shaft 4 (see Figure 6 and Figure 8 ). The wire feeding wheel driving mechanism is a rotational driving mechanism, and the output end of this rotational driving mechanism is in transmission connection with the wire feeding wheel shaft 4 and can drive the wire feeding wheel 2 to rotate forward or backward around the axis of the wire feeding wheel shaft 4.

[0061] In this embodiment, the wire feeding wheel shaft 4 in the wire feeding wheel mechanism is rotationally supported on the main swing arm 8 through a first bearing 19 and a first bearing seat 20 (see Figure 6 and Figure 8 ), where the wire feeding wheel shaft 4 is rotationally connected to the first bearing seat 20 through the first bearing 19, and the first bearing seat 20 is fixedly connected to the main swing arm 8. The first bearing seat 20 is located in a through hole correspondingly opened on the substrate 1 ( Figure 6 and Figure 8 not marked).

[0062] In this embodiment, the wire feeding wheel driving mechanism is composed of a first pulley 23, a second pulley 24, a synchronous belt 25, and a servo motor 26 (see Figure 2 and Figure 4 ), where the servo motor 26 is fixedly connected to the main swing arm 8 through a motor seat (see Figure 2 ). The axis of the motor shaft of the servo motor 26 is parallel to the axis of the wire feeding wheel shaft 4. The motor shaft is coaxially and fixedly connected to the first pulley 23. The first pulley 23 is connected to the second pulley 24 through the synchronous belt 25, and the second pulley 24 is fixedly connected to the wire feeding wheel shaft 4 (see Figure 2 and Figure 4 ). The present invention is not limited to this. The wire feeding wheel driving mechanism can be composed of a gear transmission mechanism and the servo motor 26, or the servo motor 26 can directly drive the wire feeding wheel shaft 4. This is understandable and known to those skilled in the art.

[0063] The pressure wheel mechanism, as the driven mechanism, includes a pressure wheel 3 (see Figure 1 ), a pressure wheel shaft 5 (see Figure 1 ), and a driven gear 7 (see Figure 4 ). The pressure wheel 3 and the driven gear 7 are coaxially and fixedly connected to the pressure wheel shaft 5 (seeFigure 5 and Figure 7 ).

[0064] In this embodiment, the pressure wheel shaft 5 in the pressure wheel mechanism is rotationally supported on the secondary swing arm 9 through the second bearing 21 and the second bearing seat 22 (see Figure 5 and Figure 7 ), wherein the pressure wheel shaft 5 is rotationally connected to the second bearing seat 22 through the second bearing 21, and the second bearing seat 22 is fixedly connected to the secondary swing arm 9. The second bearing seat 22 is located in the through hole correspondingly opened on the substrate 1 ( Figure 5 and Figure 7 not marked).

[0065] The driving gear 6 and the driven gear 7 have the same number of teeth and the same pitch circle diameter (see Figure 4 ). The outer diameters of the wire feeding wheel 2 and the pressure wheel 3 are the same as the pitch circle diameters of the driving gear 6 and the driven gear 7 (see Figure 1 and Figure 4 ).

[0066] The numerical control wire feeding mechanism includes a double swing arm automatic opening and closing mechanism, and this double swing arm automatic opening and closing mechanism includes a main swing arm 8 (see Figure 2 ), a secondary swing arm 9 (see Figure 2 ), a main rotating swing shaft 10 (see Figure 4 ), a secondary rotating swing shaft 11 (see Figure 4 ), a main push pin 12 (see Figure 4 ), a secondary push pin 13 (see Figure 4 ), a push and pull block 14 (see Figure 4 ), a push and pull power mechanism and an elastic member 33 (see Figure 4 ), wherein:

[0067] Taking the electrode wire 15 in the feeding or retracting section as the center (see Figure 1 ), one of the main swing arm 8 and the secondary swing arm 9 is arranged on the left side of this center, and the other is arranged on the right side of this center. In this embodiment, from Figure 1 and Figure 2 it can be seen that the main swing arm 8 is arranged on the right side of this center, and the secondary swing arm 9 is arranged on the left side of this center. On the contrary, the main swing arm 8 can also be arranged on the left side of this center, while the secondary swing arm 9 is arranged on the right side of this center. This can be understood and known by those skilled in the art.

[0068] The main rotating swing shaft 10 and the main push pin 12 are correspondingly arranged on one side of the main swing arm 8, and the secondary rotating swing shaft 11 and the secondary push pin 13 are correspondingly arranged on one side of the secondary swing arm 9 (see Figure 4). One of the main swing shaft 10 and the main push rod 12 is arranged above the other. When the main swing shaft 10 is above the main push rod 12, the auxiliary swing shaft 11 is below the auxiliary push rod 13. When the main swing shaft 10 is below the main push rod 12, the auxiliary swing shaft 11 is above the auxiliary push rod 13. In this embodiment, as Figure 4 shown, the main swing shaft 10 is arranged above the main push rod 12, and the auxiliary swing shaft 11 is below the auxiliary push rod 13. The present invention is not limited to this. Conversely, the main swing shaft 10 can also be arranged below the main push rod 12, while the auxiliary swing shaft 11 is above the auxiliary push rod 13. This is understandable and known to those skilled in the art.

[0069] The main swing arm 8 is swingably connected to the substrate 1 through the main swing shaft 10 (see Figure 6 and Figure 8 ), and the auxiliary swing arm 9 is swingably connected to the substrate 1 through the auxiliary swing shaft 11 (see Figure 7 ). The main push rod 12 is fixedly connected to the main swing arm 8 (see Figure 8 ), and the auxiliary push rod 13 is fixedly connected to the auxiliary swing arm 9 (see Figure 4 ). The axes of the main swing shaft 10, the main push rod 12, the auxiliary swing shaft 11, and the auxiliary push rod 13 are all parallel to the Y-axis direction.

[0070] The push-pull block 14 is of a plate structure (see Figure 4 ). The push-pull block 14 is provided with a slot 16 for pushing and pulling at a position corresponding to the main push rod 12 (see Figure 4 ). In the assembled state, the main push rod 12 is placed in the slot 16. The width of the slot 16 is the same as the diameter of the main push rod 12, and the two long faces of the slot 16 are parallel to the axis of the main push rod 12 (see Figure 4 ). The push-pull block 14 is provided with a pushing surface or a pulling surface 17 at a position corresponding to the auxiliary push rod 13 (see Figure 4 ), and the pushing surface or the pulling surface 17 is parallel to the axis of the auxiliary push rod 13.

[0071] The push-pull power mechanism is a linear drive mechanism and is installed on the substrate 1. The push-pull power mechanism has a push-pull drive end, and this push-pull drive end is fixedly or positionally connected to the push-pull block 14. In this embodiment, the push-pull power mechanism uses a cylinder 18 (see Figure 4 ). The cylinder body of the cylinder 18 is fixedly connected to the substrate 1, and the shaft extension end of the cylinder 18 is fixedly connected to the push-pull block 14 (see Figure 4 ). The axis of the cylinder 18 is perpendicular to the axis of the wire feeding wheel 2 in space. The cylinder 18 is communicated with the gas source through the first gas joint 36 (see Figure 1 , Figure 2 and Figure 3 ). However, the present invention is not limited to this. The push-pull power mechanism can also be an electromagnet, a cam mechanism, a gear-rack mechanism, a lever mechanism, or a crank-slider mechanism. This is understandable and known to those skilled in the art.

[0072] The elastic member 33 (see Figure 3 ) is arranged and acts between the auxiliary swing arm 9 and the substrate 1. The elastic force of the elastic member 33 forces the auxiliary swing arm 9 to swing the pressing wheel 3 towards the wire feeding wheel 2 around the axis of the auxiliary swing axis 11. In this embodiment, as Figure 9 shown, the elastic member 33 is a compression spring. A screw adjustment hole 39 and an adjustment screw 38 are provided on the substrate 1 for the compression spring (see Figure 9 ). The screw adjustment hole 39 is opened along the elastic force direction of the elastic member 33 and has an internal thread section. In the assembled state, the compression spring is inserted into the screw adjustment hole 39, and the adjustment screw 38 cooperates with the thread section of the screw adjustment hole 39. One end of the compression spring acts directly or indirectly on the auxiliary swing arm 9, and the other end of the compression spring abuts against the adjustment screw 38. Rotating the adjustment screw 38 can adjust the wire feeding pressure of the pressing wheel 3 on the wire feeding wheel 2.

[0073] In the assembled state, the entire wire feeding wheel mechanism is positioned and installed on the main swing arm 8. Among them, the wire feeding wheel shaft 4 in the wire feeding wheel mechanism is rotatably supported on the main swing arm 8 (see Figure 6 and Figure 8 ). The axis of the wire feeding wheel shaft 4 is parallel to the Y-axis direction, and the wire feeding wheel driving mechanism is positioned and installed relative to the main swing arm 8. The entire pressing wheel mechanism is positioned and installed on the auxiliary swing arm 9. Among them, the pressing wheel shaft 5 in the pressing wheel mechanism is rotatably supported on the auxiliary swing arm 9 (see Figure 5 and Figure 9 ). The axis of the pressing wheel shaft 5 is parallel to the Y-axis direction. The axis of the wire feeding wheel shaft 4 and the axis of the pressing wheel shaft 5 are located at the same height position in the Z-axis direction and at corresponding positions in the Y-axis direction (see Figure 1 and Figure 4 ). The driving gear 6 in the wire feeding wheel mechanism and the driven gear 7 in the pressing wheel mechanism are located at the same position in the Y-axis direction and mesh with each other (see Figure 4 ). The outer circumferential generatrix of the wire feeding wheel 2 in the wire feeding wheel mechanism and the pressing wheel 3 in the pressing wheel mechanism are pressed against each other (see Figure 1 ). In order to ensure better threading of the electrode wire 15, a pre-guide tube 34 is provided above the pressing part of the wire feeding wheel 2 and the pressing wheel 3, and a pre-guide nozzle 35 is provided below (see Figure 1 ).

[0074] In the use state, as Figure 4As shown, the push-pull drive end of the push-pull power mechanism (cylinder 18) in the double swing arm automatic opening and closing mechanism has two working states of pushing and pulling. In the first "pull" working state, the slot hole 16 on the push-pull block 14 forces the main push rod 12 to drive the main swing arm 8 and the wire feeding wheel 2 to swing inward around the main swing axis 10, so that the wire feeding wheel 2 reaches the wire feeding position. At the same time, the elastic member 33 forces the secondary swing arm 9 and the pressure wheel 3 to swing inward around the secondary swing axis 11, so that the outer circular generatrix of the wire feeding wheel 2 is pressed against the outer circular generatrix of the pressure wheel 3. At the same time, the driving gear 6 meshes with the driven gear 7. When the wire feeding wheel driving mechanism drives the wire feeding wheel 2 to rotate forward or backward through the wire feeding wheel shaft 4, due to the meshing of the driving gear 6 and the driven gear 7, the pressure wheel 3 is synchronously driven to rotate backward or forward. At this time, the electrode wire 15 is clamped between the wire feeding wheel 2 and the pressure wheel 3, and the electrode wire 15 can be rolled to drive the wire feeding or retracting. In the second "push" working state, the slot hole 16 on the push-pull block 14 forces the main push rod 12 to drive the main swing arm 8 and the wire feeding wheel 2 to swing outward around the main swing axis 10. At the same time, the push surface or the pull surface 17 on the push-pull block 14 forces the secondary swing arm 9 and the pressure wheel 3 to overcome the elastic force of the elastic member 33 and swing outward around the secondary swing axis 11, so that the wire feeding wheel 2 and the pressure wheel 3 are opened and in a non-wire feeding state. When the wire feeding wheel 2 and the pressure wheel 3 are in the open state, the driving gear 6 and the driven gear 7 are in a semi-meshed state with each other and do not completely disengage. In Figure 4 In, since the cylinder 18 is located on the right side of the push-pull block 14, when "pull" is the first working state, the push-pull block 14 drives the wire feeding wheel 2 to swing inward around the main swing axis 10 to reach the wire feeding position. When "push" is the second working state, the push-pull block 14 drives the wire feeding wheel 2 to swing outward around the main swing axis 10. From Figure 4 It can also be deduced that when the cylinder 18 is arranged on the left side of the push-pull block 14, when "push" is the first working state, the push-pull block 14 drives the wire feeding wheel 2 to swing inward around the main swing axis 10 to reach the wire feeding position. When "pull" is the second working state, the push-pull block 14 drives the wire feeding wheel 2 to swing outward around the main swing axis 10. Thus, it can be seen that the actual effect produced by the "push" or "pull" of the shaft extension end of the cylinder 18 is related to the arrangement position of the cylinder 18 and the push-pull block 14. This is understandable and known to those skilled in the art.

[0075] In this embodiment, the included angle between the connecting line of the outer circle center of the secondary push rod 13 and the outer circle center of the secondary swing axis 11 and the push surface or the pull surface 17 is an acute angle (see Figure 4). However, the present invention is not limited thereto. The line connecting the center of the outer circle of the auxiliary pusher 13 and the center of the outer circle of the auxiliary swing shaft 11 is parallel to the pushing surface or the pulling surface 17. In addition, it should be noted that in the present invention: although one of the main swing shaft 10 and the main pusher 12 is arranged above the other, that is, the two are in an upper and lower relationship in terms of position, it is not limited to the relationship of directly above and directly below. The line connecting the centers of their outer circles can be inclined with respect to the Z-axis, and the included angle is an acute angle. Similarly, one of the auxiliary swing shaft 11 and the auxiliary pusher 13 is arranged above the other, that is, the two are in an upper and lower relationship in terms of position, it is not limited to the relationship of directly above and directly below. The line connecting the centers of their outer circles can be inclined with respect to the Z-axis, and the included angle is an acute angle.

[0076] In this embodiment, in order to blow off the adhered working fluid and machining erosion products on the wire feeding wheel 2 and the pressure wheel 3, dehumidifying and cleaning air nozzles are provided above the wire feeding wheel 2 and the pressure wheel 3 (see Figure 1 for the reference numerals 27 and 28). There are two groups of dehumidifying and cleaning air nozzles. Among them, one group of air nozzles faces downward and aims at the outer cylindrical surface on the outside of the wire feeding wheel 2, and the other group of air nozzles faces downward and aims at the outer cylindrical surface on the outside of the pressure wheel 3. The two groups of air nozzles are connected to the air source through a channel and a second air joint 37 (see Figure 2 ).

[0077] Both groups of air nozzles adopt slit-shaped nozzles. The length direction of the slit-shaped nozzles is parallel to the axis of the wire feeding wheel 2 and the axis of the pressure wheel 3. Among them, the inward extension surface of one group of slit-shaped nozzles is inclined and tangent to the outer cylindrical surface of the wire feeding wheel 2. The inward extension surface of the other group of slit-shaped nozzles is inclined and tangent to the outer cylindrical surface of the pressure wheel 3. The one group of slit-shaped nozzles and the other group of slit-shaped nozzles are mainly composed of an air nozzle seat 27 and two air slit combination blocks 28 (see Figures 10 - 13 ). Among them, an air channel 30 is provided in the air nozzle seat 27 (see Figure 12 ), and an air inlet 32 leading to the air source is provided on the air nozzle seat 27 (see Figure 11 and Figure 12 ). The air inlet 32 is communicated with the air channel 30 (see Figure 12 ). The air nozzle seat 27 is respectively provided with a first splicing port on the side corresponding to the wire feeding wheel 2 and the side corresponding to the pressure wheel 3 (see Figure 11 and Figure 12 unlabeled). A second splicing port is provided on the air slit combination block 28 corresponding to the first splicing port (see Figure 11 and Figure 12 unlabeled). In the assembled state, one air slit combination block 28 is assembled on one side of the wire feeding wheel 2, and a pair of first splicing ports and second splicing ports are spliced to form a knife-shaped air slit 31. The other air slit combination block 28 is assembled on one side of the pressure wheel 3, and another pair of first splicing ports and second splicing ports are spliced to form another knife-shaped air slit 31 (see Figure 11). The two groups of air nozzles of the present invention are not limited to using slit-shaped nozzles, and circular nozzles can be used. Each group of circular nozzles consists of a number of spray holes spaced along the axis of the wire feeding wheel 2 and the axis of the pressure wheel 3. Among them, the axis of each spray hole in one group of circular nozzles is obliquely tangent to the outer cylindrical surface of the wire feeding wheel 2. The axis of each spray hole in the other group of circular nozzles is obliquely tangent to the outer cylindrical surface of the pressure wheel 3. This can be understood and known by those skilled in the art. In addition, in order to ensure the spraying effect of the dehumidifying clean air nozzle, baffles 29 are installed on both sides of the dehumidifying clean air nozzle (see Figure 10 and Figure 12 ).

[0078] In this embodiment, in order to improve the reliability of wire feeding, the outer ring of the wire feeding wheel 2 is made of a hard material, and micro-grooves are made axially on the outer cylindrical surface of the wire feeding wheel 2. The micro-grooves are evenly spaced circumferentially on the outer circumference of the wire feeding wheel 2 to increase the wire feeding force during wire feeding. The outer ring of the pressure wheel 3 is made of a soft material with a relatively large coefficient of friction to increase the wire feeding force during wire feeding.

[0079] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A CNC wire feeding mechanism for an automatic wire threading CNC wire-cutting electric discharge machine tool, comprising a base plate (1), a wire feeding wheel mechanism and a pressure wheel mechanism, wherein: Observing from the front of the CNC wire feeding mechanism, the length direction of the feeding or retracting section of the electrode wire (15) is defined as the Z-axis direction, the left-right direction is the X-axis direction, and the front-back direction is the Y-axis direction, with the substrate (1) as the base. The wire feeding wheel mechanism as an active mechanism comprises a wire feeding wheel (2), a wire feeding wheel shaft (4), a driving gear (6) and a wire feeding wheel driving mechanism, wherein the wire feeding wheel (2) and the driving gear (6) are coaxially fixedly connected to the wire feeding wheel shaft (4), and the wire feeding wheel driving mechanism is a rotary driving mechanism, wherein the output end of the rotary driving mechanism is drivingly connected to the wire feeding wheel shaft (4) and can drive the wire feeding wheel (2) to rotate in a forward or reverse direction around the axis of the wire feeding wheel shaft (4); The pressure wheel mechanism as a driven mechanism comprises a pressure wheel (3), a pressure wheel shaft (5) and a driven gear (7), wherein the pressure wheel (3) and the driven gear (7) are coaxially fixedly connected to the pressure wheel shaft (5); The driving gear (6) and the driven gear (7) have the same number of teeth and the same pitch circle diameter; the outer diameters of the wire feeding wheel (2) and the pressure wheel (3) are the same as the pitch circle diameters of the driving gear (6) and the driven gear (7); The invention is characterized in that: the numerically controlled wire feeding mechanism comprises a double swing arm automatic opening and closing mechanism, the double swing arm automatic opening and closing mechanism comprises a main swing arm (8), an auxiliary swing arm (9), a main swing shaft (10), an auxiliary swing shaft (11), a main push pin (12), an auxiliary push pin (13), a push-pull block (14), a push-pull power mechanism and an elastic component (33), wherein: With the electrode wire (15) being fed or retracted as the center, one of the main swing arm (8) and the auxiliary swing arm (9) is arranged on the left side of the center, and the other is arranged on the right side of the center; The main swing shaft (10) and the main push pin (12) are arranged on one side of the main swing arm (8) respectively, and the auxiliary swing shaft (11) and the auxiliary push pin (13) are arranged on one side of the auxiliary swing arm (9) respectively; one of the main swing shaft (10) and the main push pin (12) is arranged above the other, and when the main swing shaft (10) is located above the main push pin (12), the auxiliary swing shaft (11) is located below the auxiliary push pin (13); when the main swing shaft (10) is located below the main push pin (12), the auxiliary swing shaft (11) is located above the auxiliary push pin (13); The main swing arm (8) is connected to the base plate (1) in a swinging manner via a main swing shaft (10), and the auxiliary swing arm (9) is connected to the base plate (1) in a swinging manner via an auxiliary swing shaft (11); the main push pin (12) is fixedly connected to the main swing arm (8), and the auxiliary push pin (13) is fixedly connected to the auxiliary swing arm (9); the axes of the main swing shaft (10), the main push pin (12), the auxiliary swing shaft (11) and the auxiliary push pin (13) are all parallel to the Y-axis direction; The push-pull block (14) is a plate structure. The push-pull block (14) is provided with a slot hole (16) for pushing and pulling at a position corresponding to the main push pin (12). In the assembled state, the main push pin (12) is placed in the slot hole (16). The width of the slot hole (16) is consistent with the diameter of the main push pin (12). The two long surfaces of the slot hole (16) are parallel to the axis of the main push pin (12). The push-pull block (14) is provided with a push surface or a pull surface (17) at a position corresponding to the auxiliary push pin (13). The push surface or the pull surface (17) is parallel to the axis of the auxiliary push pin (13). The push-pull power mechanism is a linear drive mechanism and is mounted on a base plate (1). The push-pull power mechanism has a push-pull drive end, which is fixedly or positionally connected to a push-pull block (14). The elastic component (33) is arranged and acts between the auxiliary swing arm (9) and the base plate (1), and the elastic force of the elastic component (33) forces the auxiliary swing arm (9) to swing around the axis of the auxiliary swing shaft (11) to drive the pressure wheel (3) to swing towards the wire feeding wheel (2); In the assembled state, the wire feeding wheel mechanism is integrally positioned and installed on the main swing arm (8), wherein the wire feeding wheel shaft (4) in the wire feeding wheel mechanism is rotatably supported on the main swing arm (8), the axis of the wire feeding wheel shaft (4) is parallel to the Y-axis direction, and the wire feeding wheel driving mechanism is positioned and installed relative to the main swing arm (8); the pressing wheel mechanism is integrally positioned and installed on the auxiliary swing arm (9), wherein the pressing wheel shaft (5) in the pressing wheel mechanism is rotatably supported on the auxiliary swing arm (9), the axis of the pressing wheel shaft (5) is parallel to the Y-axis direction; the axis of the wire feeding wheel shaft (4) and the axis of the pressing wheel shaft (5) are located at the same height position in the Z-axis direction and at corresponding positions in the Y-axis direction; the driving gear (6) in the wire feeding wheel mechanism and the driven gear (7) in the pressing wheel mechanism are located at the same position in the Y-axis direction and mesh with each other, and the outer cylindrical generatrix of the wire feeding wheel (2) in the wire feeding wheel mechanism and the pressing wheel (3) in the pressing wheel mechanism are pressed with each other; In the use state, the push-pull driving end of the push-pull power mechanism in the double swing arm automatic opening and closing mechanism has two working states, namely, pushing and pulling. In the first working state, the slot (16) on the push-pull block (14) forces the main push pin (12) to drive the main swing arm (8) and the wire feeding wheel (2) to swing inward around the main swing shaft (10), so that the wire feeding wheel (2) reaches the wire feeding position. At the same time, the elastic component (33) forces the auxiliary swing arm (9) and the pressure wheel (3) to swing inward around the auxiliary swing shaft (11), so that the outer cylindrical generatrix of the wire feeding wheel (2) is pressed with the outer cylindrical generatrix of the pressure wheel (3), and at the same time, the driving gear (6) is meshed with the driven gear (7). When the wire feeding wheel driving mechanism drives the wire feeding wheel (2) to rotate forward or reverse through the wire feeding wheel shaft (4), the wire feeding wheel (2) is driven to rotate forward or reverse. When the wire feeding wheel (2) and the pressure wheel (3) rotate, the driving gear (6) and the driven gear (7) are meshed, and the pressure wheel (3) is synchronously driven to rotate in the reverse or forward direction. At this time, the electrode wire (15) is clamped between the wire feeding wheel (2) and the pressure wheel (3), and the electrode wire (15) can be rolled to drive the electrode wire (15) to be fed forward or retracted. In the second working state, the slot hole (16) on the push-pull block (14) forces the main push pin (12) to drive the main swing arm (8) and the wire feeding wheel (2) to swing outward around the main swing shaft (10), and at the same time, the push surface or pull surface (17) on the push-pull block (14) forces the auxiliary swing arm (9) and the pressure wheel (3) to overcome the elastic force of the elastic component (33) and swing outward around the auxiliary swing shaft (11), so that the wire feeding wheel (2) and the pressure wheel (3) are opened and are in a non-wire feeding state.

2. The CNC wire feeding mechanism according to claim 1, characterized in that: The main swing shaft (10) is arranged above the main push pin (12), and the auxiliary swing shaft (11) is located below the auxiliary push pin (13).

3. The CNC wire feeding mechanism according to claim 1, characterized in that: The main swing shaft (10) is arranged below the main push pin (12), and the auxiliary swing shaft (11) is located above the auxiliary push pin (13).

4. The CNC wire feeding mechanism according to claim 1, characterized in that: The elastic component (33) is a compression spring. A screw adjustment hole (39) and an adjustment screw (38) are provided on the base plate (1) for the compression spring. The screw adjustment hole (39) is opened along the elastic force direction of the elastic component (33) and has an internal thread section. In the assembled state, the compression spring is inserted into the screw adjustment hole (39). The adjustment screw (38) cooperates with the thread section of the screw adjustment hole (39). One end of the compression spring directly or indirectly acts on the auxiliary swing arm (9), and the other end of the compression spring abuts against the adjustment screw (38). The rotation of the adjustment screw (38) can adjust the wire feeding pressure of the pressure wheel (3) on the wire feeding wheel (2).

5. The CNC wire feeding mechanism according to claim 1, characterized in that: The line connecting the outer circle center of the auxiliary push pin (13) and the outer circle center of the auxiliary swing shaft (11) is parallel to the push surface or the pull surface (17), or the angle between the line connecting the outer circle center of the auxiliary push pin (13) and the outer circle center of the auxiliary swing shaft (11) and the push surface or the pull surface (17) is an acute angle.

6. The CNC wire feeding mechanism according to claim 1, characterized in that: When the wire feeding wheel (2) and the pressure wheel (3) are in an open state, the driving gear (6) and the driven gear (7) are in a semi-engaged state with each other and are not completely out of engagement.

7. The CNC wire feeding mechanism according to claim 1, characterized in that: The wire feeding wheel shaft (4) in the wire feeding wheel mechanism is rotatably supported on the main swing arm (8) via a first bearing (19) and a first bearing seat (20), wherein the wire feeding wheel shaft (4) is rotatably connected to the first bearing seat (20) via the first bearing (19), and the first bearing seat (20) is fixedly connected to the main swing arm (8); the pressing wheel shaft (5) in the pressing wheel mechanism is rotatably supported on the auxiliary swing arm (9) via a second bearing (21) and a second bearing seat (22), wherein the pressing wheel shaft (5) is rotatably connected to the second bearing seat (22) via the second bearing (21), and the second bearing seat (22) is fixedly connected to the auxiliary swing arm (9).

8. The CNC wire feeding mechanism according to claim 1, characterized in that: Dehumidifying clean air nozzles are provided on the upper parts of the wire feeding wheel (2) and the pressing wheel (3). The dehumidifying clean air nozzles are provided with two groups of air nozzles, wherein one group of air nozzles is directed downwardly toward the outer cylindrical surface of the outer side of the wire feeding wheel (2), and the other group of air nozzles is directed downwardly toward the outer cylindrical surface of the outer side of the pressing wheel (3). The two groups of air nozzles are connected to the air source through channels and air pipe joints.

9. The CNC wire feeding mechanism according to claim 8, characterized in that: The two groups of air nozzles both adopt slit-shaped nozzles, the length direction of the slit-shaped nozzles is parallel to the axis of the wire feeding wheel (2) and the axis of the pressure wheel (3), wherein the inwardly extending surface of one group of slit-shaped nozzles is inclined and tangent to the outer cylindrical surface of the wire feeding wheel (2); and the inwardly extending surface of the other group of slit-shaped nozzles is inclined and tangent to the outer cylindrical surface of the pressure wheel (3).

10. The CNC wire feeding mechanism according to claim 9, characterized in that: The one group of slit-shaped nozzles and the other group of slit-shaped nozzles are mainly composed of an air nozzle seat (27) and two air slit assembly blocks (28), wherein an air channel (30) is provided in the air nozzle seat (27), and an air inlet (32) leading to an air source is provided on the air nozzle seat (27), and the air inlet (32) is communicated with the air channel (30); the air nozzle seat (27) is provided with a first splicing interface on one side corresponding to the wire feeding wheel (2) and on one side corresponding to the pressure wheel (3), respectively, and a second splicing interface is provided on the air slit assembly block (28) corresponding to the first splicing interface; in an assembled state, one air slit assembly block (28) is assembled on one side of the wire feeding wheel (2), and a pair of first splicing interfaces and a second splicing interface are spliced ​​together to form a knife-shaped air slit (31); another air slit assembly block (28) is assembled on one side of the pressure wheel (3), and another pair of first splicing interfaces and a second splicing interface are spliced ​​together to form another knife-shaped air slit (31).

11. The CNC wire feeding mechanism according to claim 8, characterized in that: The two groups of air nozzles both adopt circular nozzles, and each group of circular nozzles consists of a plurality of nozzle holes spaced apart along the axis of the wire feeding wheel (2) and the axis of the pressure wheel (3), wherein the axis of each nozzle hole in one group of circular nozzles is obliquely arranged to be tangent to the outer cylindrical surface of the wire feeding wheel (2); and the axis of each nozzle hole in the other group of circular nozzles is obliquely arranged to be tangent to the outer cylindrical surface of the pressure wheel (3).

12. The CNC wire feeding mechanism according to claim 1, characterized in that: The wire feeding wheel driving mechanism comprises a first pulley (23), a second pulley (24), a synchronous belt (25) and a servo motor (26), wherein the servo motor (26) is fixedly connected to the main swing arm (8) via a motor seat, the motor shaft axis of the servo motor (26) is parallel to the axis of the wire feeding wheel shaft (4), the motor shaft is coaxially fixedly connected to the first pulley (23), the first pulley (23) and the second pulley (24) are connected via a synchronous belt (25), and the second pulley (24) is fixedly connected to the wire feeding wheel shaft (4).

13. The CNC wire feeding mechanism according to claim 1, characterized in that: The wire feeding wheel driving mechanism is composed of a gear transmission mechanism and a servo motor (26), or the servo motor (26) directly drives the wire feeding wheel shaft (4).

14. The CNC wire feeding mechanism according to claim 1, characterized in that: The push-pull power mechanism adopts a cylinder (18), the cylinder body of the cylinder (18) is fixedly connected to the base plate (1), the shaft extension end of the cylinder (18) is fixedly connected to the push-pull block (14), and the axis of the cylinder (18) is perpendicular to the axis of the wire feeding wheel (2) in space.

15. The CNC wire feeding mechanism according to claim 1, characterized in that: The push-pull power mechanism is an electromagnet, a cam mechanism, a gear rack mechanism, a lever mechanism or a crank connecting rod mechanism.

16. The CNC wire feeding mechanism according to claim 1, characterized in that: The outer ring of the wire feeding wheel (2) is made of a hard material, and micro grooves are made along the axial direction on the outer circumferential surface of the wire feeding wheel (2), and the micro grooves are evenly spaced in the circumferential direction of the outer circle of the wire feeding wheel (2) to increase the wire feeding force during wire feeding; the outer ring of the pressure wheel (3) is made of a soft material with a large friction coefficient to increase the wire feeding force during wire feeding.

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