Numerical control wire feeding mechanism for automatic wire penetrating numerical control electric spark linear cutting machine tool

Abstract

A numerical control wire feeding mechanism for an automatic wire penetrating numerical control wire cut electrical discharge machining tool comprises a base plate, a wire feeding wheel mechanism and a pressing wheel mechanism, the wire feeding wheel mechanism comprises a wire feeding wheel, a wire feeding wheel shaft, a driving gear and a wire feeding wheel driving mechanism, and the pressing wheel mechanism comprises a pressing wheel, a pressing wheel shaft and a driven gear. The mechanism comprises a main swing arm, an auxiliary swing arm, a main rotating swing shaft, an auxiliary rotating swing shaft, a main push pin, an auxiliary push pin, a push-pull block, a push-pull power mechanism and an elastic component. According to the scheme, the wire feeding wheel can be accurately fed to a fixed wire feeding position, the certainty of the wire feeding center position is guaranteed, the pressure of the pressing wheel on the electrode wire during wire feeding can be adjusted through the adjusting screw, and the requirement for automatic wire feeding is met. The defects that in the prior art, the wire feeding position is uncertain, the wire feeding pressure is inconvenient to adjust, the wire feeding wheel and the electrode wire are prone to slipping in the wire feeding process, and wire feeding is unreliable are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of electric spark wire cutting processing, in particular to a numerically controlled wire feeding mechanism for an automatic wire threading numerically controlled electric spark wire cutting machine tool. Background Art

[0002] As a metal cutting processing equipment, CNC reciprocating wire EDM (abbreviated as: EDM Wire Cutting Machine) is widely used in the processing of precision and complex parts in manufacturing industries such as molds, aerospace, automobiles, energy, precision instruments, medical equipment, and electronic products, and occupies an important position in industrial production. EDM wire cutting uses a continuously moving thin metal wire (called electrode wire) as an electrode to perform pulsed spark discharge to erode metal and cut the workpiece into shape. Wire threading is required before or during the online cutting process. At present, most EDM Wire Cutting Machines can only use manual wire threading. Manual wire threading is highly professional and requires professional operation. It also has a complex process, high requirements, large workload, and low efficiency. To this end, in recent years, technicians in this field have been working hard to research and develop fully automatic wire threading devices and methods suitable for EDM Wire Cutting Machines. Fully automatic wire threading is a complex and detailed system engineering in the field of wire cutting technology of electric spark machining. It has high process requirements, many difficulties and great technical difficulty. It has long been a technical problem in this field. Among them, how the wire feeding mechanism in automatic wire threading can meet the requirements of stability, reliability and control is one of the technical difficulties that need to be overcome.

[0003] Chinese patent CN218694675U discloses a utility model patent named "An automatic wire threading device for a wire cutting machine tool". The upper wire threading mechanism described in the patent is a wire feeding mechanism, which is mainly composed of a first clamping assembly, a rotating member, and a first driving assembly. The first clamping assembly is composed 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 through a first rotating shaft. The top of the first clamping plate is provided with a first clamping member (first wire feeding wheel), the top of the second clamping plate is provided with a second clamping member (second wire feeding wheel), and a first space is provided between the bottoms of the first clamping plate and the second clamping plate; the rotating member is an elliptical wheel and is driven by a first return shaft. The elliptical wheel is driven by a rotary cylinder, and 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 are close to each other and can clamp the electrode wire. The first driving assembly is composed 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 and feed the wire. The above-mentioned upper wire feeding mechanism, as a wire feeding mechanism for automatic wire feeding, has the following shortcomings: first, the position of the wire feeding wheel is unstable and easy to offset, resulting in uncertainty in the wire feeding position and affecting the wire feeding effect; second, it is inconvenient to adjust the wire feeding pressure; third, the wire feeding wheel and the electrode wire are easy to slip during the wire feeding process, and the wire feeding is unreliable. Summary of the invention

[0004] The invention provides a numerically controlled wire feeding mechanism for an automatic wire threading numerically controlled electric spark wire cutting machine tool, the purpose of which is 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 stability, reliability and control requirements of full-automatic wire threading.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a CNC wire feeding mechanism for an automatic wire threading CNC electric spark wire cutting machine tool, comprising a base plate, 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 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 based on the substrate.

[0006] The wire feeding wheel mechanism as an active 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 fixedly connected to the wire feeding wheel shaft. The wire feeding wheel driving mechanism is a rotating driving mechanism. The output end of the rotating driving mechanism is transmission-connected to the wire feeding wheel shaft and can drive the wire feeding wheel to rotate forward or reversely around the axis of the wire feeding wheel shaft.

[0007] The pressure wheel mechanism as a driven mechanism comprises a pressure wheel, a pressure wheel shaft and a driven gear, and the pressure wheel and the driven gear are coaxially fixedly connected to the pressure wheel shaft.

[0008] The driving gear and the driven gear have the same number of teeth and the same pitch circle diameter. The outer diameters of the driving gear and the pressure wheel are the same as the pitch circle diameters of the driving gear and the driven gear.

[0009] The innovation lies in that the CNC wire feeding mechanism includes a double swing arm automatic opening and closing mechanism, which includes a main swing arm, a secondary swing arm, a main swing shaft, a secondary swing shaft, a main push pin, a secondary push pin, a push-pull block, a push-pull power mechanism and an elastic component, wherein: With the electrode wire being fed or retracted as the center, one of the main swing arm and the auxiliary swing arm is arranged on the left side of the center, and the other is arranged on the right side of the center.

[0010] The main swing shaft and the main push pin are arranged on one side of the main swing arm, and the auxiliary swing shaft and the auxiliary push pin are arranged on one side of the auxiliary swing arm. One of the main swing shaft and the main push pin is arranged above the other, and when the main swing shaft is located above the main push pin, the auxiliary swing shaft is located below the auxiliary push pin, and when the main swing shaft is located below the main push pin, the auxiliary swing shaft is located above the auxiliary push pin.

[0011] The main swing arm is connected to the base plate through the main swing shaft, and the auxiliary swing arm is connected to the base plate through the auxiliary swing shaft. The main push pin is fixedly connected to the main swing arm, and the auxiliary push pin is fixedly connected to the auxiliary swing arm. The axes of the main swing shaft, the main push pin, the auxiliary swing shaft and the auxiliary push pin are all parallel to the Y-axis direction.

[0012] The push-pull block is a plate structure, and a slot hole for pushing and pulling is provided at a position corresponding to the main push pin. In the assembled state, the main push pin is placed in the slot hole, the width of the slot hole is consistent with the diameter of the main push pin, and the two long faces of the slot hole are parallel to the axis of the main push pin. A push surface or a pull surface is provided at a position corresponding to the auxiliary push pin, and the push surface or the pull surface is parallel to the axis of the auxiliary push pin.

[0013] The push-pull power mechanism is a linear drive mechanism and is installed on a base plate. The push-pull power mechanism has a push-pull drive end, which is fixedly or positionally connected to the push-pull block.

[0014] The elastic component is arranged and acts between the auxiliary swing arm and the base plate. The elastic force of the elastic component forces the auxiliary swing arm to drive the pressure wheel to swing toward the wire feeding wheel around the axis of the auxiliary swing shaft.

[0015] In the assembled state, the wire feeding wheel mechanism is integrally positioned and installed on the main swing arm, wherein the wire feeding wheel shaft in the wire feeding wheel mechanism is rotatably supported on the main swing arm, the wire feeding wheel shaft axis 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 pressing wheel mechanism is integrally positioned and installed on the auxiliary swing arm, wherein the pressing wheel shaft in the pressing wheel mechanism is rotatably supported on the auxiliary swing arm, and the pressing wheel shaft axis is parallel to the Y-axis direction. The wire feeding wheel shaft axis and the pressing wheel shaft axis are located at the same height position in the Z-axis direction, and at corresponding positions in the Y-axis direction. The driving gear in the wire feeding wheel mechanism and the driven gear 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 in the wire feeding wheel mechanism and the pressing wheel in the pressing wheel mechanism are pressed together.

[0016] When in use, 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 slots on the push-pull block force the main push pin to drive the main swing arm and the wire feeding wheel to swing inward 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 inward around the auxiliary swing axis, so that the outer circle generatrix of the wire feeding wheel is pressed together with the outer circle generatrix of the pressure wheel, and at the same time, the driving gear is meshed with the driven gear. When the wire feeding wheel driving mechanism drives the wire feeding wheel to rotate forward or reversely through the wire feeding wheel shaft, the driving gear is meshed with the driven gear, and the pressure wheel is synchronously driven to rotate forward or reversely. At this time, an electrode wire is clamped between the wire feeding wheel and the pressure wheel, and the electrode wire can be rolled to drive it forward or backward. In the second working state, the slots on the push-pull block force the main push pin to drive the main swing arm and the wire feeding wheel to swing outward around the main swing axis. At the same time, the push surface or pull surface on the push-pull block forces the auxiliary swing arm and the pressure wheel to overcome the elastic force of the elastic component and swing outward around the auxiliary swing axis, so that the wire feeding wheel and the pressure wheel are opened and in a non-wire feeding state.

[0017] The relevant contents in the above technical solution are explained as follows: 1. In the above scheme, the "main swing arm and wire feeding wheel swing inward around the main swing axis" means that the main swing arm and wire feeding wheel swing toward the auxiliary swing arm and pressure wheel, and "the auxiliary swing arm and pressure wheel swing inward around the auxiliary swing axis" means that the auxiliary swing arm and pressure wheel swing toward the main swing arm and wire feeding wheel. The outward swing is opposite to the inward swing.

[0018] 2. In the above scheme, the main swing shaft is arranged above the main push pin, and the auxiliary swing shaft is located below the auxiliary push pin.

[0019] 3. In the above scheme, the main swing shaft is arranged below the main push pin, and the auxiliary swing shaft is located above the auxiliary push pin.

[0020] 4. In the above scheme, the elastic component is a compression spring, and a screw adjustment hole and an adjusting screw are provided on the base plate for the compression spring. The screw adjustment hole is opened along the elastic force direction of the elastic component and has an internal thread section. In the assembled state, the compression spring is inserted into the screw adjustment hole, and the adjusting screw cooperates with the thread section of the screw adjustment hole. One end of the compression spring directly or indirectly acts on the auxiliary swing arm, and the other end of the compression spring rests on the adjusting screw. Rotating the adjusting screw can adjust the wire feeding pressure of the pressure wheel on the wire feeding wheel.

[0021] 5. In the above scheme, the line connecting the outer circle center of the auxiliary push pin and the outer circle center of the auxiliary swing shaft is parallel to the push surface or the pull surface, or the angle between the line connecting the outer circle center of the auxiliary push pin and the outer circle center of the auxiliary swing shaft and the push surface or the pull surface is an acute angle.

[0022] 6. In the above scheme, when the wire feeding wheel and the pressure wheel are in the open state, the driving gear and the driven gear are in a semi-engaged state with each other and are not completely disengaged.

[0023] 7. In the above scheme, the wire feeding wheel shaft in the wire feeding wheel mechanism is rotatably supported on the main swing arm through the first bearing and the first bearing seat, wherein the wire feeding wheel shaft is rotatably connected to the first bearing seat through the first bearing, and the first bearing seat is fixedly connected to the main swing arm. The pressure wheel shaft in the pressure wheel mechanism is rotatably supported on the auxiliary swing arm through the second bearing and the second bearing seat, wherein the pressure wheel shaft is rotatably connected to the second bearing seat through the second bearing, and the second bearing seat is fixedly connected to the auxiliary swing arm.

[0024] 8. In the above scheme, dehumidified clean air nozzles are provided on the upper part of the wire feeding wheel and the pressure wheel. The dehumidified clean air nozzles are provided with two groups of air nozzles, wherein one group of air nozzles is downwardly directed toward the outer cylindrical surface outside the wire feeding wheel, and the other group of air nozzles is downwardly directed toward the outer cylindrical surface outside the pressure wheel. The two groups of air nozzles are connected to the air source through channels and air pipe joints.

[0025] 9. In the above scheme, the two groups of air nozzles both adopt slit-shaped nozzles, and the length direction of the slit-shaped nozzles is parallel to the axis of the wire feeding wheel and the axis of the pressure 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 pressure wheel.

[0026] 10. In the above scheme, the one group of slit-shaped nozzles and the other group of slit-shaped nozzles are mainly composed of an air nozzle seat and two air slit assembly blocks, wherein an air channel is provided in the air nozzle seat, and an air inlet leading to the air source is provided on the air nozzle seat, and the air inlet is connected to the air channel. The air nozzle seat is provided with a first splicing interface on one side corresponding to the wire feeding wheel and on one side corresponding to the pressure wheel, respectively, and a second splicing interface is provided on the air slit assembly block corresponding to the first splicing interface. In the assembled state, one air slit assembly block is assembled on one side of the wire feeding wheel, and a pair of first splicing interfaces and a second splicing interface are spliced ​​together to form a knife-shaped air slit. Another air slit assembly block is assembled on one side of the pressure wheel, and another pair of first splicing interfaces and a second splicing interface are spliced ​​together to form another knife-shaped air slit.

[0027] 11. In the above scheme, the two groups of air nozzles are circular nozzles, each group of circular nozzles is composed of a plurality of nozzles spaced along the axis of the wire feeding wheel and the axis of the pressure wheel, wherein the axis of each nozzle in one group of circular nozzles is obliquely tangent to the outer cylindrical surface of the wire feeding wheel. The axis of each nozzle in the other group of circular nozzles is obliquely tangent to the outer cylindrical surface of the pressure wheel.

[0028] 12. In the above scheme, the wire feeding wheel driving mechanism is composed of a first pulley, a second pulley, a synchronous belt and a servo motor, wherein the servo motor is fixedly connected to the main swing arm through a motor seat, the motor shaft axis of the servo motor is parallel to the wire feeding wheel shaft axis, the motor shaft is coaxially fixedly connected to the first pulley, the first pulley and the second pulley are connected through a synchronous belt, and the second pulley is fixedly connected to the wire feeding wheel shaft.

[0029] 13. In the above scheme, the wire feeding wheel driving mechanism is composed of a gear transmission mechanism and a servo motor, or the wire feeding wheel shaft is directly driven by the servo motor.

[0030] 14. In the above scheme, the push-pull power mechanism adopts a cylinder, the cylinder body of the cylinder is fixedly connected to the base plate, the extended end of the cylinder shaft is fixedly connected to the push-pull block, and the cylinder axis is perpendicular to the wire feeding wheel axis in space.

[0031] 15. In the above solution, the push-pull power mechanism is an electromagnet, a cam mechanism, a gear rack mechanism, a lever mechanism or a crank-connecting rod mechanism.

[0032] 16. In the above scheme, the outer ring of the wire feeding wheel is made of hard material, and micro grooves are made along the axial direction on the outer circumference of the wire feeding wheel, and the micro grooves are evenly spaced in the circumference of the outer circle of the wire feeding wheel to increase the wire feeding force during wire feeding. The outer ring of the pressure wheel is made of soft material with a large friction coefficient to increase the wire feeding force during wire feeding.

[0033] Due to the application of the above scheme, the present invention has the following substantial characteristics and effects compared with the prior art: 1. The present invention adopts a specific double-swing arm automatic opening and closing mechanism, which not only arranges the wire feeding wheel and the pressure wheel on the main swing arm and the auxiliary swing arm respectively, but also cleverly combines the main push-pull drive, the auxiliary push-pull drive, 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. The structural design is reasonable, the mechanism is simple and reliable, and the control is convenient.

[0034] 2. During the closing process of the wire feeding wheel and the pressure wheel, the double-swing arm automatic opening and closing mechanism of the present invention can accurately feed the wire feeding wheel to the fixed wire feeding position through the push-pull power mechanism (cylinder) and the push-pull block, thereby ensuring the certainty of the wire feeding center position and overcoming the problem that the position of the wire feeding wheel in the prior art is unstable and easy to deviate, causing uncertainty in the wire feeding position and affecting the wire feeding effect.

[0035] 3. The present invention cooperates with the elastic component (spring) through the double swing arm automatic opening and closing mechanism. 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 adjustment screw to meet the requirements of automatic wire feeding. It overcomes the defects of the prior art that the wire feeding pressure adjustment is inconvenient, the wire feeding wheel and the electrode wire are easy to slip during wire feeding, and the wire feeding is unreliable.

[0036] 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 cylindrical surface. The outer ring of the pressure wheel is made of soft material with a large friction coefficient, which increases the pressure of the wire feeding wheel and improves the reliability of wire feeding.

[0037] 5. The present invention designs a dehumidified clean air nozzle to blow away the working fluid and processing erosion products adhering to the wire feeding wheel and the pressure wheel, thereby ensuring the reliability of wire feeding. In particular, the dehumidified clean air nozzle uses two groups of slit-shaped nozzles or circular nozzles arranged in a straight line to spray downward and obliquely toward the outer cylindrical surface of the wire feeding wheel and the outer side of the pressure wheel, respectively, to achieve a significant cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Attached Figure 1 It is a front view of the CNC wire feeding mechanism according to an embodiment of the present invention.

[0039] Attached Figure 2 It is a top view of the CNC wire feeding mechanism according to an embodiment of the present invention.

[0040] Attached Figure 3 It is a left view of the CNC wire feeding mechanism according to an embodiment of the present invention.

[0041] Attached Figure 4 It is a rear view of the CNC wire feeding mechanism according to an embodiment of the present invention.

[0042] Attached Figure 5 for Figure 1 AA section view.

[0043] Attached Figure 6 for Figure 1 BB cross-sectional view.

[0044] Attached Figure 7 for Figure 4 CC cross-sectional view.

[0045] Attached Figure 8 for Figure 4 DD cross-sectional view.

[0046] Attached Fig. 9 for Figure 1 GG cross-sectional view.

[0047] Attached Fig.10 It is a front view of the dehumidification clean air nozzle in an embodiment of the present invention.

[0048] Attached Fig.11 It is a top view of the dehumidification clean air nozzle in an embodiment of the present invention.

[0049] Attached Fig.12 for Fig.11 EE cross-sectional view.

[0050] Attached Fig.13 for Fig.12 Zoom in on F in the figure.

[0051] In the above figures: 1. Base plate; 2. Wire feed wheel; 3. Pressure wheel; 4. Wire feed wheel shaft; 5. Pressure wheel shaft; 6. Driving gear; 7. Driven gear; 8. Main swing arm; 9. Auxiliary swing arm; 10. Main swing shaft; 11. Auxiliary swing shaft; 12. Main push pin; 13. Auxiliary push pin; 14. Push-pull block; 15. Electrode wire; 16. Slot hole; 17. Push face or pull face; 18. Cylinder; 19. First bearing; 20. First bearing seat; 21. First Second bearing; 22. Second bearing seat; 23. First pulley; 24. Second pulley; 25. Synchronous belt; 26. Servo motor; 27. Air nozzle seat; 28. Air gap assembly block; 29. ​​Baffle; 30. Air channel; 31. Knife-shaped air gap; 32. Air inlet; 33. Elastic component; 34. Pre-guide tube; 35. Pre-guide nozzle; 36. First air joint; 37. Second air joint; 38. Adjustment screw; 39. Screw adjustment hole. DETAILED DESCRIPTION

[0052] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Embodiment: A numerically controlled wire feeding mechanism for an automatic wire threading numerically controlled electric spark wire cutting machine tool.

[0053] like Figure 1-13 As shown, the CNC wire feeding mechanism includes a base plate 1, a wire feeding wheel mechanism and a pressing wheel mechanism, wherein: Observe from the front of the CNC wire feeding mechanism ( Figure 1 The electrode wire 15 is defined with the substrate 1 as the base (see Figure 1 ) The length direction of the feed or retract section is the Z-axis direction, the left-right direction is the X-axis direction, and the front-back direction is the Y-axis direction.

[0054] The wire feeding wheel mechanism as an active mechanism includes a wire feeding wheel 2 (see Figure 1 )、Wire feed wheel shaft 4 (see Figure 1 )、Driving gear 6 (see Figure 4 ) and the wire feeding wheel driving mechanism, the wire feeding wheel 2 and the driving gear 6 are coaxially fixedly connected to the wire feeding wheel shaft 4 (see Figure 6 and Figure 8 ), the wire feeding wheel driving mechanism is a rotary driving mechanism, the output end of which is transmission-connected to the wire feeding wheel shaft 4, and can drive the wire feeding wheel 2 to rotate forward or reverse around the axis of the wire feeding wheel shaft 4.

[0055] In this embodiment, the wire feed wheel shaft 4 in the wire feed wheel mechanism is rotatably supported on the main swing arm 8 through the first bearing 19 and the first bearing seat 20 (see Figure 6 and Figure 8 ), wherein the wire feeding wheel shaft 4 is rotatably 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 corresponding through hole opened on the base plate 1 ( Figure 6 and Figure 8 (not marked in the figure).

[0056] 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 ), wherein the servo motor 26 is fixedly connected to the main swing arm 8 through the motor base (see Figure 2 ), 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 is connected to the second pulley 24 through a 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 thereto, and the wire feeding wheel driving mechanism may be composed of a gear transmission mechanism and a servo motor 26, or the wire feeding wheel shaft 4 may be directly driven by the servo motor 26. This is understandable and known to those skilled in the art.

[0057] The pressure wheel mechanism as a driven mechanism includes a pressure wheel 3 (see Figure 1 )、Pressing wheel shaft 5 (see Figure 1 ) and driven gear 7 (see Figure 4 ), the pressure wheel 3 and the driven gear 7 are coaxially fixedly connected to the pressure wheel shaft 5 (see Figure 5 and Figure 7).

[0058] In this embodiment, the pressing wheel shaft 5 in the pressing wheel mechanism is rotatably supported on the auxiliary 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 rotatably connected to the second bearing seat 22 through the second bearing 21, and the second bearing seat 22 is fixedly connected to the auxiliary swing arm 9. The second bearing seat 22 is located in a corresponding through hole opened on the base plate 1 ( Figure 5 and Figure 7 (not marked in the figure).

[0059] 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 driving gear 6 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 ).

[0060] The numerical control wire feeding mechanism comprises a double swing arm automatic opening and closing mechanism, which comprises a main swing arm 8 (see Figure 2 )、Auxiliary swing arm 9 (see Figure 2 )、Main swing shaft 10 (see Figure 4 )、Secondary swing shaft 11 (see Figure 4 ), main promotion 12 (see Figure 4 )、Assisted Sales 13 (see Figure 4 )、Push-pull block 14 (see Figure 4 ), push-pull power mechanism and elastic component 33 (see Figure 4 ),in: The electrode wire 15 of the feeding or retracting section is the center (see Figure 1 ), 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. Figure 1 and Figure 2 From the perspective of the present invention, the main swing arm 8 is arranged on the right side of the center, and the auxiliary swing arm 9 is arranged on the left side of the center. On the contrary, the main swing arm 8 can also be arranged on the left side of the center, and the auxiliary swing arm 9 can be arranged on the right side of the center. This is understandable and known to those skilled in the art.

[0061] The main swing shaft 10 and the main push pin 12 are arranged on one side of the main swing arm 8, and the auxiliary swing shaft 11 and the auxiliary push pin 13 are arranged on one side of the auxiliary swing arm 9 (see Figure 4 ). One of the main swing shaft 10 and the main push pin 12 is arranged above the other. 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. In this embodiment, Figure 4As shown, 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. The present invention is not limited to this, and the main swing shaft 10 can also be arranged below the main push pin 12, and the auxiliary swing shaft 11 can be located above the auxiliary push pin 13. This is understandable and known to those skilled in the art.

[0062] The main swing arm 8 is connected to the base plate 1 through the main swing shaft 10 (see Figure 6 and Figure 8 ), the auxiliary swing arm 9 is connected to the base plate 1 through the auxiliary swing shaft 11 (see Figure 7 The main push pin 12 is fixedly connected to the main swing arm 8 (see Figure 8 ), the auxiliary push pin 13 is fixedly connected to the auxiliary swing arm 9 (see Figure 4 ). 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.

[0063] The push-pull block 14 is 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 pin 12 (see Figure 4 ), 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, and the two long faces of the slot hole 16 are parallel to the axis of the main push pin 12 (see Figure 4 The push-pull block 14 is provided with a push surface or a pull surface 17 at a position corresponding to the auxiliary push-pull block 13 (see Figure 4 ), the pushing surface or pulling surface 17 is parallel to the axis of the auxiliary pushing surface 13.

[0064] The push-pull power mechanism is a linear drive mechanism and is mounted on the base plate 1. The push-pull power mechanism has a push-pull drive end, which is fixed or positioned with the push-pull block 14. In this embodiment, the push-pull power mechanism adopts a cylinder 18 (see Figure 4 ), the cylinder body of the cylinder 18 is fixedly connected to the base plate 1, and the extended end of the shaft 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, and the cylinder 18 is connected to the air source through the first air connector 36 (see Figure 1 , Figure 2 and Figure 3 ). However, the present invention is not limited thereto, and the push-pull power mechanism may also be an electromagnet, a cam mechanism, a gear rack mechanism, a lever mechanism or a crank connecting rod mechanism. This is understandable and known to those skilled in the art.

[0065] The elastic member 33 (see Figure 3 ) 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 drive the pressure wheel 3 to swing toward the wire feeding wheel 2 around the axis of the auxiliary swing shaft 11. In this embodiment, Fig. 9 As shown, the elastic component 33 is a compression spring, and a screw adjustment hole 39 and an adjustment screw 38 are provided on the base plate 1 for the compression spring (see Fig. 9 ), 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, and the adjusting 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 rests on the adjusting screw 38. Rotating the adjusting screw 38 can adjust the wire feeding pressure of the pressure wheel 3 on the wire feeding wheel 2.

[0066] 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 (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 pressure wheel mechanism is positioned and installed on the auxiliary swing arm 9 as a whole, wherein the pressure wheel shaft 5 in the pressure wheel mechanism is rotatably supported on the auxiliary swing arm 9 (see Figure 5 and Fig. 9 ), the axis of the pressure wheel shaft 5 is parallel to the Y-axis direction. The axis of the wire feeding wheel shaft 4 and the axis of the pressure wheel shaft 5 are located at the same height position in the Z-axis direction, and are located 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 pressure wheel mechanism are located at the same position in the Y-axis direction and mesh with each other (see Figure 4 ), the outer circle 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 together (see Figure 1 In order to ensure that the electrode wire 15 is better threaded, a pre-guiding tube 34 is provided above the pressing part of the wire feeding wheel 2 and the pressing wheel 3, and a pre-guiding nozzle 35 is provided below (see Figure 1 ).

[0067] In use, if Figure 4As shown, the push-pull driving end of the push-pull power mechanism (cylinder 18) in the double swing arm automatic opening and closing mechanism has two working states: pushing and pulling. In the first "pulling" 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 rotating 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 rotating swing shaft 11, so that the outer circle generatrix of the wire feeding wheel 2 is pressed with the outer circle generatrix of the pressure wheel 3, and 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 reversely through the wire feeding wheel shaft 4, the driving gear 6 is meshed with the driven gear 7, and the pressure wheel 3 is synchronously driven to rotate forward or reversely. 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 it to be fed in or retracted. In the second "push" 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 feed wheel 2 to swing outward around the main swing shaft 10. 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 feed wheel 2 and the pressure wheel 3 are opened and in a non-wire feeding state. When the wire feed 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-engaged state with each other, and are not completely disengaged. Figure 4 In the embodiment, since the cylinder 18 is located on the right side of the push-pull block 14, when the "pull" is used as the first working state, the push-pull block 14 drives the wire feeding wheel 2 to swing inward around the main rotating swing shaft 10 to reach the wire feeding position. When the "push" is used as the second working state, the push-pull block 14 drives the wire feeding wheel 2 to swing outward around the main rotating swing shaft 10. 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 "pushing" is the first working state, the push-pull block 14 drives the wire feeding wheel 2 to swing inward around the main swing shaft 10 to reach the wire feeding position. When "pulling" is the second working state, the push-pull block 14 drives the wire feeding wheel 2 to swing outward around the main swing shaft 10. It can be seen that the actual effect of "pushing" or "pulling" the shaft extension end of the cylinder 18 is related to the position of the cylinder 18 and the push-pull block 14. This is understandable and known to those skilled in the art.

[0068] In this embodiment, 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 pull surface 17 is an acute angle (see Figure 4). However, the present invention is not limited to this, and 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. In addition, it should be noted that in the present invention: although one of the main swing shaft 10 and the main push pin 12 is arranged above the other, that is, the two are in an upper and lower relationship in position, but are not limited to the relationship of directly above and directly below, the line connecting the outer circle centers of the two can be tilted relative to the Z axis, and the angle between them is an acute angle. Similarly, one of the auxiliary swing shaft 11 and the auxiliary push pin 13 is arranged above the other, that is, the two are in an upper and lower relationship in position, but are not limited to the relationship of directly above and directly below, and the line connecting the outer circle centers of the two can be tilted relative to the Z axis, and the angle between them is an acute angle.

[0069] In this embodiment, in order to blow away the adhered working fluid and the processed etched materials from the wire feeding wheel 2 and the pressure wheel 3, a dehumidifying clean air nozzle is provided on the upper part of the wire feeding wheel 2 and the pressure wheel 3 (see Figure 1 The dehumidifying and cleaning air nozzles are provided with two groups of air nozzles, one of which is directed downwardly to the outer cylindrical surface of the outer side of the wire feeding wheel 2, and the other group of air nozzles is directed downwardly to 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 the channel and the second air joint 37 (see Figure 2 ).

[0070] The two groups of air nozzles are both slit-shaped nozzles, and 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. 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 assembly blocks 28 (see Figure 10-13 ), wherein the air nozzle seat 27 is provided with an air passage 30 (see Fig.12 ), the air nozzle seat 27 is provided with an air inlet 32 ​​leading to the air source (see Fig.11 and Fig.12 ), the air inlet 32 ​​is connected to the air channel 30 (see Fig.12 The air nozzle seat 27 is provided with a first joint interface on one side corresponding to the wire feeding wheel 2 and on one side corresponding to the pressure wheel 3 (see Fig.11 and Fig.12 Unnumbered), a second joint is provided on the air seam assembly block 28 corresponding to the first joint (see Fig.11 and Fig.12 Unnumbered), in the assembled state, one air gap assembly block 28 is assembled on one side of the wire feeding wheel 2, a pair of first joints and a second joint are assembled to form a knife-shaped air gap 31, and another air gap assembly block 28 is assembled on one side of the pressure wheel 3, and another pair of first joints and a second joint are assembled to form another knife-shaped air gap 31 (see Fig.11). The two groups of air nozzles of the present invention are not limited to slit-shaped nozzles, but circular nozzles may be used. Each group of circular nozzles consists of a plurality of spray holes spaced along the axis of the wire feeding wheel 2 and the axis of the pressure wheel 3, wherein 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 is understandable and known to those skilled in the art. In addition, in order to ensure the blowing effect of the dehumidified clean air nozzle, baffles 29 are installed on both sides of the dehumidified clean air nozzle (see Fig.10 and Fig.12 ).

[0071] In this embodiment, in order to improve the reliability of wire feeding, the outer ring of the wire feeding wheel 2 is made of hard material, and micro grooves are made along the axial direction on the outer circumferential surface of the wire feeding wheel 2. 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 soft material with a large friction coefficient to increase the wire feeding force during wire feeding.

[0072] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in 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 driving gear (6) 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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