Automatic wire threading EDM wire cutting machine with automatic wire clamping and releasing

Abstract

A wire reel for automatic wire threading electric spark wire cutting machine tool, the wire reel is mainly composed of a fixed clamp block, a movable clamp block, a lever and a main compression spring, and the clamping mouth is normally closed. A power mechanism is provided for the lever to release the clamping force of the main compression spring on the wire reel. The power mechanism is external to the wire reel and does not rotate at high speed with the wire reel, avoiding the problem of the power source needing to be rotated and fed. An auxiliary compression spring is provided between the movable clamp block and the lever. The main compression spring provides a larger wire clamping force to the movable clamp block through the lever force amplification. When the clamping force of the main compression spring on the wire reel is released, the auxiliary compression spring provides a smaller wire clamping force to the movable clamp block, ensuring that the electrode wire does not separate from the wire reel during wire drawing, meeting the requirements of automatic wire threading of the machine tool. A V-shaped guide port is provided at the upper part between the fixed clamp block and the movable clamp block, which is used to guide the electrode wire into the wire clamping surface. The lower part of the fixed clamp block is designed as a micro-inclined surface that shrinks inward to position the electrode wire, ensuring that the electrode wire is reliably positioned during automatic clamping on the wire reel.

Description

Technical Field

[0001] The present invention relates to the technical field of electric spark wire cutting, and in particular to an automatic wire clamping and releasing wire drum for an automatic wire threading numerically controlled reciprocating wire electric spark wire cutting machine. The automatic wire clamping and releasing wire drum is used to automatically clamp and release the electrode wire head wound on the wire drum during the automatic wire threading process of the 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 machine tool can automatically clamp and release the electrode wire head wound on the wire tube during the automatic wire threading process is one of the technical difficulties that need to be overcome.

[0003] Chinese patent CN117817063A discloses the first invention patent application entitled "A high-speed automatic wire clamping method". Although the application discloses a wire clamping mechanism using a movable block and a fixed block, it does not disclose whether the device for opening the wire clamping mechanism is installed and positioned with the wire drum or not. In addition, the description and drawings do not show that the wire clamping mechanism is external to the wire drum.

[0004] Chinese patent CN216829027U discloses the second utility model patent entitled "An automatic wire clamping and loosening wire barrel". Chinese patent CN116213858B discloses the third invention patent entitled "A method for automatic wire threading and removing wires by wire cutting". Chinese patent CN113145950A discloses the fourth invention patent application entitled "A fully automatic wire threading and removing device for wire cutting". The above second to fourth patent documents are all radially movable pressing plates, among which the second patent document clearly states that the device for opening the wire clamping mechanism is connected to the wire reel and rotates with the wire reel, and a rotary joint is provided to connect the power air source and the rotating wire reel. Since the wire reel has to rotate at high speed for a long time, the seal of the rotary joint is easily damaged and has poor reliability. In addition, the structure of the device for opening the wire clamping mechanism is complex. From the third patent document Figure 6 and Figure 7 This also proves the situation. The fourth patent document is basically the same as the third patent document. None of the above patents mentions that after the main compression spring releases the clamping force of the wire clamp on the electrode wire, the auxiliary compression spring is used to keep the wire clamp on the electrode wire with a small clamping force.

[0005] In view of this, the present invention proposes an automatic wire clamping and releasing wire drum suitable for automatic wire threading electric spark wire cutting machine to solve the technical problem and ensure the successful automatic wire threading of the machine. Summary of the invention

[0006] The invention provides an automatic wire clamping and releasing wire drum for an automatic wire threading electric spark wire cutting machine tool, and aims to solve the problems of complex structure and poor reliability of the existing automatic wire clamping and releasing wire drum.

[0007] To achieve the above object, the technical solution adopted by the present invention is: an automatic wire clamping and releasing wire reel for an automatic wire threading electric spark wire cutting machine tool, comprising a wire reel, the wire reel is rotatably supported on a support seat, and the support seat is fixed on a wire reel drag plate, and its innovation lies in:

[0008] The wire drum is provided with a wire clamp for clamping the electrode wire and having a normally closed clamping mouth, and an opening mechanism which is externally arranged relative to the wire drum.

[0009] The wire clamp comprises a fixed clamp block, a movable clamp block, a lever, a main compression spring and an auxiliary compression spring, wherein:

[0010] The fixed clamping block is a fixed clamping body of the wire clamp, which is fixedly connected to the outer cylindrical surface of the wire drum. The fixed clamping block is provided with a fixed wire clamping surface, which is consistent with the circumferential winding direction of the electrode wire on the outer cylindrical surface of the wire drum.

[0011] The movable clamping block is a movable clamping body of the wire clamp, which is movably connected to the outer cylinder of the wire reel. A movable wire clamping surface is provided on the movable clamping block. In the assembled state, the movable wire clamping surface is opposite to the fixed wire clamping surface and is arranged face to face. The moving direction of the movable clamping block is parallel to the axial direction of the wire reel.

[0012] The lever is a rod used to operate and control the opening and closing of the clamp in the wire clamp. The lever is rotatably supported on the outer cylindrical surface of the wire drum with the rotation fulcrum as a reference. One end of the lever serves as the active end and the other end serves as the driven end.

[0013] The main compression spring is an elastic element used to provide the first elastic force in the wire clamp. The main compression spring acts on the active end of the lever, causing the lever to swing forward around the rotation fulcrum. The driven end of the lever acts on the movable clamping block and forces the movable wire clamping surface of the movable clamping block and the fixed wire clamping surface of the fixed clamping block to press and close the clamping jaw, thereby forming a wire clamp with a normally closed clamping jaw.

[0014] The auxiliary compression spring is an elastic element used to provide a second elastic force in the wire clamp. The auxiliary compression spring is arranged between the surfaces opposite to the driven end of the lever and the moving clamping block. The elastic force of the auxiliary compression spring acts in a direction parallel to the axis of the wire reel, and the elastic force of the auxiliary compression spring is smaller than the elastic force of the main compression spring.

[0015] The opening mechanism is a linear drive device having a controlled pressure output end, which is positioned and mounted on the support seat and is externally arranged relative to the wire reel. The pressure output end is located on one side of a circular path along which an active end of the lever rotates with the wire reel. In a working state, when the active end of the lever rotates along with the wire reel and stays opposite to the pressure output end, the pressure output end acts on the active end of the lever to overcome the direction of the elastic force of the main compression spring and force the lever to swing in the opposite direction around the rotation fulcrum, thereby releasing the clamping force of the main compression spring on the movable clamp through the driven end of the lever.

[0016] The relevant contents in the above technical solution are explained as follows:

[0017] 1. In the above scheme, the "wire clamp with normally closed jaws" means that the jaws of the wire clamp are always in a compressed and closed state without external force. Normally closed is relative to normally open.

[0018] 2. In the above scheme, the "forward swing" refers to the lever swinging the wire clamp jaws in the direction of tightening and closing, and the "reverse swing" refers to the lever swinging the wire clamp jaws in the direction of releasing and loosening.

[0019] 3. In the above scheme, the lever is arranged along the circumferential direction of the outer cylindrical surface of the wire tube and is rotated and positioned by a support shaft at the rotating fulcrum. The support shaft is positioned on the outer cylinder of the wire tube, and the axis of the support shaft is arranged along the radial direction of the wire tube. The direction of action of the elastic force of the main compression spring is parallel to the axial direction of the wire tube.

[0020] 4. In the above scheme, a first placement hole and a second placement hole are opened between the lever and the moving clamping block corresponding to the position of the auxiliary compression spring. The first placement hole is arranged on the moving clamping block, and the second placement hole is arranged on the lever. In the assembled state, one end of the auxiliary compression spring is placed in the first placement hole, and the other end is placed in the second placement hole.

[0021] 5. In the above scheme, the side of the fixed clamping block that fits with the outer cylindrical surface of the wire tube is designed to be an arc surface, and the side of the movable clamping block that fits with the outer cylindrical surface of the wire tube is designed to be an arc surface. The diameters of the arc surface of the fixed clamping block and the arc surface of the movable clamping block are consistent with the diameter of the outer cylindrical surface of the wire tube. In the assembled state, the fixed clamping block and the movable clamping block are both fitted with the outer cylindrical surface of the wire tube through the arc surfaces.

[0022] 6. In the above scheme, the fixed wire clamping surface of the fixed clamping block is designed to be a micro-slope that contracts inward at a position close to the outer cylindrical surface of the wire barrel. The height of the micro-slope in the radial direction of the wire barrel is greater than or equal to the diameter of the electrode wire, and the amount of retraction in the axial direction of the wire barrel is less than the diameter of the electrode wire, which plays a positioning role for the electrode wire entering the wire clamp when it is close to the fixed wire clamping surface.

[0023] 7. In the above scheme, the upper part of the fixed wire clamping surface of the fixed clamping block is designed to be a slope or an arc surface, and the upper part of the movable wire clamping surface of the movable clamping block is designed to be a slope or an arc surface. The slope or arc surface of the fixed clamping block and the slope or arc surface of the movable clamping block form a V-shaped guide opening, which guides the electrode wire entering the wire clamp.

[0024] 8. In the above scheme, the fixed clamping block is provided with side slopes at both end positions corresponding to the circumferential direction of the wire drum, and the side slopes form an acute angle with the circumferential direction of the wire drum, so that the electrode wire clamped in the wire clamp avoids the winding path of the electrode wire when it is spirally wound on the wire drum.

[0025] 8. In the above scheme, a cylindrical pressure head is arranged on the upper side of the driven end of the lever facing the moving clamp block, and a force-bearing surface is arranged on the moving clamp block for the cylindrical pressure head. In the working state, the cylindrical pressure head on the driven end of the lever cooperates with the force-bearing surface on the moving clamp block.

[0026] 9. In the above scheme, a movable clamping block positioning ring is provided for the movable clamping block, and the movable clamping block positioning ring is an annular component. In the assembled state, the movable clamping block positioning ring is fixed in the circumferential direction of the outer cylinder of the wire tube where the movable clamping block is located. The movable clamping block positioning ring is provided with a guide groove at the position where the movable clamping block is located along the moving direction of the movable clamping block. The movable clamping block is located in the guide groove and cooperates with the movement of the guide groove.

[0027] 10. In the above scheme, the movable clamping block is provided with cylindrical guide bodies at both end positions corresponding to the circumferential direction of the wire drum, and the cylindrical guide bodies are slidably matched with the corresponding groove body surfaces on both sides and the upper side of the guide groove to form a sliding guide pair.

[0028] 11. In the above scheme, the side surface of the movable clamping block positioning ring close to the fixed clamping surface of the fixed clamping block is perpendicular to the axis of the wire drum, and a gap is left with the fixed clamping surface of the fixed clamping block.

[0029] 12. In the above scheme, a main compression spring countersunk hole is opened at the active end of the lever, and the axis of the main compression spring countersunk hole is parallel to the axis of the wire drum. A through main compression spring through hole is opened at the position of the moving clamp block positioning ring corresponding to the main compression spring countersunk hole. The main compression spring through hole is a threaded hole and is coaxial with the main compression spring countersunk hole. In the assembled state, one end of the main compression spring is placed in the main compression spring countersunk hole, and the other end of the main compression spring is placed in one end of the main compression spring through hole. A set screw is screwed into the other end of the main compression spring through hole and compresses the length of the main compression spring to adjust the elastic force of the main compression spring.

[0030] 13. In the above scheme, a lever support ring is provided for the lever. The lever support ring is an annular component. In the assembled state, the lever support ring is fixed on the circumferential direction of the outer cylindrical surface of the wire tube where the lever is located. The lever support ring is provided with a space groove at the position where the lever is located, and the lever is placed in the space groove.

[0031] 14. In the above scheme, the lever support ring is provided with an extended positioning arm for the lever, and the positioning arm is located on the outer side of the lever relative to the wire reel. The positioning arm is provided with a positioning hole opposite to the rotation fulcrum of the lever, and a mounting hole is provided on the wire reel corresponding to the position of the positioning hole. The axes of the positioning hole and the mounting hole are arranged radially along the wire reel, and in the assembled state, the support shaft rotates and positions the lever at the rotation fulcrum through the positioning hole and the mounting hole.

[0032] 15. In the above scheme, the lever is provided with a radial hole at the rotation fulcrum, and the radial hole is mounted on the support shaft so that the lever can swing around the support shaft.

[0033] 16. In the above scheme, the wire clamps are composed of at least two, each wire clamp is evenly arranged in the circumferential direction of the wire drum, and each wire clamp is located on the same cross section of the wire drum perpendicular to the axis of the wire drum.

[0034] 17. In the above scheme, the linear drive device is a pneumatic cylinder, a hydraulic cylinder, a linear motor, a solenoid valve, a cam-top mechanism, a lever mechanism, or a linear drive mechanism composed of a motor and a lead screw nut.

[0035] 18. In the above scheme, the cylinder is composed of a first cylinder and a second cylinder, the first cylinder has a first cylinder shaft, the second cylinder has a second cylinder shaft, the axes of the first cylinder shaft and the second cylinder shaft are parallel to the axis of the wire reel, and the first cylinder shaft and the second cylinder shaft are both located on one side of the circular path of the active end of the lever rotating with the wire reel, wherein the second cylinder shaft is arranged at the wire clamping and releasing position corresponding to the top of the wire reel, and the first cylinder shaft is arranged at the wire clamping and releasing position corresponding to the bottom of the wire reel.

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

[0037] 1. The present invention is designed with a wire clamp mechanism for automatically clamping and releasing the electrode wire, including a fixed clamp block, a movable clamp block, a lever, a main compression spring, a movable clamp block positioning ring, a lever support ring, etc., on the outer cylindrical surface of the wire drum. The main compression spring provides a locking force to form a wire clamp structure with a normally closed clamping jaw. The design is ingenious and the structure is compact. When the wire drum runs at high speed, the wire clamp can not only maintain a clamped state, but also maintain dynamic balance when the wire drum rotates at high speed.

[0038] 2. The present invention is provided with a linear drive device (such as a cylinder) for opening the clamping opening of the wire clamp at the set stop position of the wire drum support seat corresponding to the wire clamp, and the wire clamp of the wire drum can be opened under the control of the automatic wire threading system of the machine tool. The opening power mechanism of the wire clamp does not rotate at high speed with the wire drum, and has a reasonable structure and reliable operation, avoiding the shortcomings of the prior art that the opening mechanism and the wire drum are designed as one body, the power source needs to be fed through a rotating feeding link, easy to wear, poor reliability, and complex structure.

[0039] 3. The present invention cleverly designs a structure in which a main compression spring and an auxiliary compression spring cooperate. The main compression spring provides a larger wire clamping force to the movable clamp block through a lever force amplifier. When the main compression spring force is removed by applying pressure to the active end of the lever through an external linear drive device (such as a cylinder), the auxiliary compression spring can also provide a smaller clamping force to the movable clamp block. This smaller clamping force can ensure that the electrode wire does not separate from the wire clamp during wire drawing, thereby meeting the requirements of automatic wire threading of the machine tool.

[0040] 4. In the present invention, a V-shaped guide port is provided along the radial direction of the wire barrel at the upper wire feeding portion of the wire clamping surface between the fixed clamping block and the movable clamping block to guide the electrode wire into the wire clamping surface. The wire clamping surface of the fixed clamping block is designed to be a micro-inclined surface that shrinks inward at a position close to the outer cylindrical surface of the wire barrel. The micro-inclined surface and the outer cylindrical surface of the wire barrel form a micro-V-shaped groove in the axial direction of the wire barrel to position the electrode wire, thereby ensuring that the electrode wire is reliably positioned and clamped in the micro-V-shaped groove of the wire clamping during automatic clamping on the wire barrel.

[0041] 5. The fixed clamp block of the present invention is provided with side slopes at both ends of the corresponding wire drum circumferential direction, and the side slopes form an acute angle with the circumferential direction of the wire drum, so that the electrode wire clamped in the wire clamp avoids the winding path of the electrode wire when it is spirally wound on the wire drum.

[0042] 6. The movable clamping block of the present invention is provided with cylindrical guide bodies at both ends of the corresponding wire drum circumferential direction. The cylindrical guide bodies are slidably matched with the corresponding groove bodies on both sides of the guide groove to form a sliding guide pair, which further improves the reliability of the matching between the movable clamping block and the fixed clamping block. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Attached Figure 1It is a schematic diagram of a wire clamp mechanism for pulling an electrode wire into a wire drum according to an embodiment of the present invention;

[0044] Attached Figure 2 This is a front view of a wire reel that automatically clamps and releases wire according to an embodiment of the present invention;

[0045] Attached Figure 3 for Figure 2 AA section view in;

[0046] Attached Figure 4 A bottom view of a wire drum that automatically clamps and releases wire according to an embodiment of the present invention;

[0047] Attached Figure 5 It is a right view of the automatic wire clamping and releasing wire drum according to the embodiment of the present invention;

[0048] Attached Figure 6 for Figure 2 BB section view in;

[0049] Attached Figure 7 for Figure 6 The CC partial section rotated view in;

[0050] Attached Figure 8 for Figure 4 DD section view in;

[0051] Attached Fig. 9 for Figure 8 The enlarged view of point E in the figure;

[0052] Attached Fig.10 for Figure 4 FF partial cross-sectional view;

[0053] Attached Fig.11 for Figure 4 The partial cross-sectional view of GG in FIG.

[0054] Attached Fig.12 A three-dimensional diagram of a fixed clamp block according to an embodiment of the present invention;

[0055] Attached Fig.13 A top view of a clamping block according to an embodiment of the present invention;

[0056] Attached Fig.14 for Fig.13 HH section view in;

[0057] Attached Fig.15 for Fig.14 Section II in the figure;

[0058] Attached Fig.16 This is a stereoscopic view of a movable clamp from a first viewing angle according to an embodiment of the present invention;

[0059] Attached Fig.17 This is a stereoscopic view of the movable clamping block from a second viewing angle according to an embodiment of the present invention;

[0060] Attached Fig.18 This is a front view of a movable clamping block according to an embodiment of the present invention;

[0061] Attached Fig.19 A top view of a movable clamping block according to an embodiment of the present invention;

[0062] Attached Fig. 20 This is a left view of a movable clamping block according to an embodiment of the present invention;

[0063] Attached Fig.21 This is a front view of a lever according to an embodiment of the present invention;

[0064] Attached Fig. 22 for Fig.21 JJ section view in;

[0065] Attached Fig.23 It is a left side view of the lever of the embodiment of the present invention;

[0066] Attached Fig.24 This is a front view of a positioning ring of a movable clamping block according to an embodiment of the present invention;

[0067] Attached Fig.25 This is a left side view (half section) of the positioning ring of the movable clamping block according to an embodiment of the present invention;

[0068] Attached Fig.26 This is a front view of a lever support ring according to an embodiment of the present invention;

[0069] Attached Fig. 27 for Fig.26 KK section view in.

[0070] In the above figures: 1. wire drum; 2. electrode wire; 3. fixed clamping block; 4. movable clamping block; 5. lever; 6. main compression spring; 7. first cylinder; 8. fixed wire clamping surface; 9. movable wire clamping surface; 10. first cylinder shaft; 11. support seat; 12. wire drum slide plate; 13. wire drum shaft; 14. movable clamping block positioning ring; 15. guide groove; 16. support shaft; 17. auxiliary compression spring; 18. cylindrical pressure head; 19. wire clamp; 20. micro-inclined surface; 21. side inclined surface; 22. cylindrical guide 1. body; 23. lever support ring; 24. space groove; 25. second cylinder; 26. second cylinder shaft; 27. main compression spring countersunk hole; 28. main compression spring through hole; 29. ​​set screw; 30. positioning arm; 31. positioning hole; 32. mounting hole; 33. radial hole; 34. first placement hole; 35. servo motor; 36. motor shaft; 37. coupling; 38. motor seat; 39. V-shaped guide port; 40. second placement hole; 41. wire hook block; 42. wire clamp. DETAILED DESCRIPTION

[0071] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0072] Embodiment: An automatic wire clamping and releasing wire drum for an automatic wire threading electric spark wire cutting machine

[0073] like Figure 1-Figure 27 As shown, the automatic wire clamping and releasing wire reel comprises a wire reel 1 (see Figure 1-4 ), the wire drum 1 is fixedly connected to the wire drum shaft 13 (see Figure 3 ), the wire drum shaft 13 is rotatably supported on the support seat 11 (see Figure 1-Figure 2 ), the support seat 11 is fixed on the silk tube carriage 12 (see Figure 1-Figure 2 ), the servo motor 35 is positioned and installed on the motor seat 38, the motor shaft 36 is coaxially arranged with the wire drum shaft 13, the motor shaft 36 is fixedly connected with the wire drum shaft 13 through the coupling 37, and drives the wire drum 1 to rotate (see Figure 3 ).

[0074] A wire clamp 19 (see FIG. 1 ) is provided on the wire drum 1 for clamping the electrode wire 2 and having a normally closed clamping opening. Figure 1-Figure 2 ) and an opening mechanism externally arranged relative to the wire reel 1.

[0075] In this embodiment, three wire clamps 19 are arranged in the circumferential direction of the wire drum 1 (see Figure 6 ), each wire clip 19 is evenly arranged in the circumferential direction of the wire drum 1, and each wire clip 19 is located on the same cross section of the wire drum 1 perpendicular to the axis of the wire drum 1. However, the present invention is not limited to this, and one or two, or even more, can be provided. This is a change that is easily understood and accepted by those skilled in the art.

[0076] The wire clamp 19 includes a fixed clamp block 3, a movable clamp block 4, a lever 5, a main compression spring 6 and an auxiliary compression spring 17 (see Figure 7 ),in:

[0077] The fixed clamp block 3 is a fixed clamping body of the wire clamp 19 (see Figure 12-Figure 15 ), the fixed clamp block 3 is fixedly connected to the outer cylindrical surface of the wire drum 1 (see Figure 7 ), the fixed clamp block 3 is provided with a fixed wire clamping surface 8 (see Fig.13 and Fig.15 ), the fixed wire clamping surface 8 is consistent with the circumferential winding direction of the electrode wire 2 on the outer cylindrical surface of the wire tube 1 (reference Figure 1 , Figure 2 and Figure 4 , “reference” means that the meaning of the text can be understood in conjunction with the provided illustrations).

[0078] The movable clamp block 4 is a movable clamping body of the wire clamp 19 (see Figure 16-Figure 20 ), the movable clamp block 4 is movably connected to the outer cylinder of the wire drum 1 (see Figure 7 ), the movable clamping block 4 is provided with a movable clamping surface 9 (see Fig.17 , Fig.19 and Fig. 20 ), in the assembled state, the movable wire clamping surface 9 faces the fixed wire clamping surface 8 and is arranged face to face (reference Fig.10 ), the moving direction of the movable clamping block 4 is parallel to the axial direction of the wire drum 1.

[0079] In this embodiment, the side of the fixed clamping block 3 that fits the outer cylindrical surface of the wire drum 1 is designed to be an arc surface (see Fig.12 and Fig.14 ), the side of the movable clamping block 4 that fits with the outer cylindrical surface of the wire tube 1 is designed to be an arc surface (see Fig.18 ), the diameter of the arc surface of the fixed clamp block 3 and the arc surface of the movable clamp block 4 is consistent with the diameter of the outer cylindrical surface of the wire drum 1. In the assembled state, the fixed clamp block 3 and the movable clamp block 4 are both fitted with the outer cylindrical surface of the wire drum 1 through the arc surface (see Fig.10 ).

[0080] In this embodiment, the fixed wire clamping surface 8 of the fixed clamping block 3 is designed to be a micro-inclined surface 20 (see FIG. Fig.15 ), the height of the micro-slope 20 in the radial direction of the wire drum 1 is greater than or equal to the diameter of the electrode wire 2, and the amount of retraction in the axial direction of the wire drum 1 is less than the diameter of the electrode wire 2, which plays a positioning role for the electrode wire 2 entering the wire clamp 19 when it is close to the fixed wire clamping surface 8.

[0081] In this embodiment, the upper portion of the fixed clamping surface 8 of the fixed clamping block 3 is designed as an inclined surface or an arc surface, and the upper portion of the movable clamping surface 9 of the movable clamping block 4 is designed as an inclined surface or an arc surface. The inclined surface or the arc surface of the fixed clamping block 3 and the inclined surface or the arc surface of the movable clamping block 4 form a V-shaped guide opening 39 (see Fig.10 ), which guides the electrode wire 2 entering the wire clamp 19.

[0082] In this embodiment, the fixed clamp block 3 is provided with side inclined surfaces 21 at both ends of the circumferential direction of the corresponding wire drum 1 (see Fig.13 ), the side slope 21 forms an acute angle with the circumferential direction of the wire tube 1 (see Figure 7 ), so that the electrode wire 2 clamped in the wire clamp 19 avoids the winding path of the electrode wire 2 when it is spirally wound on the wire tube 1.

[0083] In this embodiment, three movable clamp block positioning rings 14 are provided for the movable clamp block 4 (see Figure 7 , Fig. 9 , Fig.10 , Fig.24 and Fig.25 ), the movable clamp block positioning ring 14 is an annular component. In the assembled state, the three movable clamp block positioning rings 14 are fixed on the circumferential direction of the outer cylinder of the wire drum 1 where the movable clamp block 4 is located (see Figure 8 ), the movable clamp block positioning ring 14 is provided with a guide groove 15 along the moving direction of the movable clamp block 4 at the position where the movable clamp block 4 is located (see Fig.25), the movable clamp block 4 is located in the guide groove 15 and moves in cooperation with the guide groove 15 (see Fig. 9 This embodiment uses three movable clamp block positioning rings 14, which are butted end to end at intervals in the circumferential direction of the wire drum 1 and form three guide grooves 15 (see Fig.25 ), each guide groove 15 is used to place a movable clamp 4. In fact, the movable clamp block positioning ring 14 can also be designed as one or two, and then laid in the circumferential direction of the wire drum 1, and finally the guide groove 15 is opened on the movable clamp block positioning ring 14. When there is one movable clamp block positioning ring 14, it is in a circular ring shape. These are all easily understood and accepted by those skilled in the art.

[0084] In this embodiment, the movable clamping block 4 is provided with cylindrical guide bodies 22 (see FIG. Figure 16-18 ), the cylindrical guide body 22 is slidably matched with the groove body surfaces corresponding to the two sides and the upper side of the guide groove 15 to form a sliding guide pair (see Fig. 9 The side surface of the movable clamping block positioning ring 14 close to the fixed clamping surface 8 of the fixed clamping block 3 is perpendicular to the axis of the wire drum 1 and has a gap with the fixed clamping surface 8 of the fixed clamping block 3.

[0085] The lever 5 is a rod member used to operate and control the opening and closing of the clamp in the wire clamp 19 (see Figure 21-23 ), the lever 5 is rotatably supported on the outer cylindrical surface of the wire drum 1 with the rotation fulcrum as a reference (see Figure 7 ), one end of the lever 5 serves as the active end, and the other end serves as the driven end.

[0086] The main compression spring 6 is an elastic element in the wire clamp 19 for providing a first elastic force (see Figure 7 and Fig.11 ), the main compression spring 6 acts on the active end of the lever 5 (see Figure 7 ), so that the lever 5 swings forward around the fulcrum (positive swing means that the lever 5 swings the clamping mouth of the wire clamp 19 in the direction of pressing and closing), the driven end of the lever 5 acts on the movable clamp block 4, and forces the movable clamping surface 9 of the movable clamp block 4 and the fixed clamping surface 8 of the fixed clamp block 3 to press and close the clamping mouth (see Figure 7 ), thereby forming a wire clamp 19 with a normally closed jaw (a wire clamp 19 with a normally closed jaw means that the jaws of the wire clamp 19 are always in a compressed and closed state without external force interference).

[0087] The auxiliary compression spring 17 is an elastic element in the wire clamp 19 for providing a second elastic force (see Figure 7 ), the auxiliary compression spring 17 is arranged between the driven end of the lever 5 and the surface opposite to the movable clamping block 4 (see Figure 7 ), the direction of the elastic force of the auxiliary compression spring 17 is parallel to the axial direction of the wire drum 1.

[0088] In this embodiment, the lever 5 is arranged along the circumferential direction of the outer cylindrical surface of the wire drum 1 and is rotatably positioned by a support shaft 16 at the rotation fulcrum (see Figure 6 ), the support shaft 16 is positioned on the outer cylinder of the wire drum 1, the axis of the support shaft 16 is arranged along the radial direction of the wire drum 1, and the elastic force of the main compression spring 6 acts in a direction parallel to the axis of the wire drum 1 (see Figure 7 Two auxiliary compression springs 17 are arranged between the driven end of the lever 5 and the surface opposite to the movable clamping block 4 (see Figure 7 ), the elastic force of the auxiliary compression spring 17 acts in a direction parallel to the axis of the wire drum 1 (see Figure 7 ), the elastic force of the auxiliary compression spring 17 is smaller than the elastic force of the main compression spring 6. The present invention cleverly designs the structure of the main compression spring 6 and the auxiliary compression spring 17. The main compression spring 6 provides a larger wire clamping force to the movable clamp block through the lever 5 force increase. When the main compression spring force is removed by applying pressure to the active end of the lever 5 through an external linear drive device (such as a cylinder), the auxiliary compression spring 17 can also provide a smaller clamping force to the movable clamp block 4. This smaller clamping force can ensure that the electrode wire does not separate from the wire clamp during wire drawing. Its working mechanism is: due to the wire clamp 42 (see the wire clamp 42 of the automatic wire threading system of the machine tool) Figure 1 ) After the electrode wire 2 is pulled into the wire clamp 19 of the wire drum 1, the wire head of the electrode wire 2 is still clamped in the wire clamp 42. At this time, the wire head of the electrode wire 2 needs to be pulled back into the wire clamp 19 to prevent the wire head outside the wire clamp 19 from swinging under the action of centrifugal force when the wire drum 1 rotates at high speed. The electrode wire 2 (molybdenum wire) is elastic and bendable. When the automatic wire threading system of the machine tool pulls the wire head of the electrode wire 2 outside the wire clamp 19 back into the wire clamp 19, the wire head of the electrode wire 2 may escape from the wire clamp 19. At this time, due to the action of the auxiliary compression spring 17, the movable clamp block 4 always maintains a small clamping force on the fixed clamp block 3, which can ensure that the electrode wire 2 does not separate from the wire clamp 19 during wire drawing.

[0089] A first placement hole 34 and a second placement hole 40 are provided between the lever 5 and the movable clamping block 4 at positions corresponding to the auxiliary compression spring 17. The first placement hole 34 is provided on the movable clamping block 4 (see Fig.16 and Fig.18 ), the second placement hole 40 is provided on the lever 5 (see Fig.21 ), in the assembled state, one end of the auxiliary compression spring 17 is placed in the first placement hole 34, and the other end is placed in the second placement hole 40 (see Figure 7 ).

[0090] In this embodiment, a cylindrical pressure head 18 (see Fig. 22 and Figure 7 ), a force-bearing surface is provided on the movable clamping block 4 for the cylindrical pressure head 18. In the working state, the cylindrical pressure head 18 on the driven end of the lever 5 cooperates with the force-bearing surface on the movable clamping block 4.

[0091] In this embodiment, the active end of the lever 5 is provided with a main compression spring countersunk hole 27 (see Fig.21 and Fig. 22 ), the axis of the main compression spring countersunk hole 27 is parallel to the axis of the wire drum 1, and a through main compression spring through hole 28 is opened at the position of the movable clamp block positioning ring 14 corresponding to the main compression spring countersunk hole 27 (see Fig.25 ), the main compression spring through hole 28 is a threaded hole and is coaxial with the main compression spring countersunk hole 27. In the assembled state, one end of the main compression spring 6 is placed in the main compression spring countersunk hole 27, and the other end of the main compression spring 6 is placed in one end of the main compression spring through hole 28. A set screw 29 is screwed into the other end of the main compression spring through hole 28 and compresses the length of the main compression spring 6 to adjust the elastic force of the main compression spring 6 (see Figure 7 ).

[0092] In this embodiment, three lever support rings 23 are provided for the lever 5 (see Fig.26 and Fig. 27 ), the lever support ring 23 is an annular component. In the assembled state, the three lever support rings 23 are fixed in the circumferential direction of the outer cylindrical surface of the wire drum 1 where the lever 5 is located (see Figure 6 ), the lever support ring 23 is provided with a space groove 24 at the position where the lever 5 is located (see Fig. 27 ), the lever 5 is placed in the space groove 24 (see Figure 6 ). This embodiment uses three lever support rings 23, which are connected end to end at intervals in the circumferential direction of the wire drum 1 to form three space grooves 24 (see Fig. 27 ), a lever 5 is placed in each space slot 24 (see Figure 6 ). In fact, the lever support ring 23 can also be designed as one or two, and then laid in the circumferential direction of the wire drum 1, and finally the space groove 24 is opened on the lever support ring 23. When the lever support ring 23 is one, it is a circular ring. These are all easily understood and accepted by those skilled in the art.

[0093] In this embodiment, the lever support ring 23 is provided with an extended positioning arm 30 (see Fig. 27 ), the positioning arm 30 is located on the outside of the lever 5 relative to the wire drum 1 (see Figure 6 ), the positioning arm 30 is provided with a positioning hole 31 (see Fig. 27 ), a mounting hole 32 is provided on the wire drum 1 corresponding to the position of the positioning hole 31 (see Figure 6 ), the axes of the positioning hole 31 and the mounting hole 32 are arranged radially along the wire drum 1, and in the assembled state, the support shaft 16 rotates and positions the lever 5 at the rotation fulcrum through the positioning hole 31 and the mounting hole 32 (see Figure 6 The lever 5 is provided with a radial hole 33 at the rotation fulcrum (see Fig. 22), the radial hole 33 is mounted on the support shaft 16 so that the lever 5 can swing around the support shaft 16 (see Figure 6 ).

[0094] The opening mechanism is a linear drive device (see Figure 7 , such as a cylinder), the linear drive device has a controlled pressure output end, the pressure output end is positioned and installed on the support seat 11, and is externally arranged relative to the wire reel 1, and the pressure output end is located on the side of the circumferential path of the active end of the lever 5 rotating with the wire reel 1. In the working state, when the active end of the lever 5 rotates with the wire reel 1 and stays directly opposite to the pressure output end, the pressure output end acts on the active end of the lever 5 to overcome the force direction of the elastic force of the main compression spring 6 and force the lever 5 to swing in the opposite direction around the rotation fulcrum (reverse swing means that the lever swings the wire clamp jaws in the direction of release), thereby releasing the clamping force of the main compression spring 6 on the movable clamp 4 through the driven end of the lever 5.

[0095] In this embodiment, the linear drive device selects a cylinder with simple structure and reliable operation. Specifically, two cylinders are used, namely the first cylinder 7 and the second cylinder 25 (see Figure 5 ), the first cylinder 7 has a first cylinder shaft 10 (see Figure 2 ), the second cylinder 25 has a second cylinder shaft 26 (see Figure 2 ), the axes of the first cylinder shaft 10 and the second cylinder shaft 26 are parallel to the axis of the wire drum 1, and the first cylinder shaft 10 and the second cylinder shaft 26 are both located on one side of the circumferential path of the active end of the lever 5 rotating with the wire drum 1 (see Figure 2 ), wherein the second cylinder shaft 26 is arranged at the wire clamping and releasing position corresponding to the top of the wire drum 1, and the first cylinder shaft 10 is arranged at the wire clamping and releasing position corresponding to the bottom of the wire drum 1 (see Figure 2 ). When a wire clamp 19 of the wire drum 1 rotates to the wire clamping position at the bottom of the wire drum 1 according to the command of the machine tool automatic wire threading system, the first cylinder shaft 10 corresponding to the outer side of the active end of the lever 5 is pushed outward under the control of the command of the machine tool automatic wire threading system, overcoming the elastic force of the main compression spring 6, so that the lever 5 swings in the opposite direction around the support shaft 16, and the clamping mouth of this wire clamp 19 is opened. In this state, the movable clamp block 4 is subjected to the pressure of the auxiliary compression spring 17, and a smaller wire clamping force is formed between the movable clamp block 4 and the fixed clamp block 3. At this time, the wire feeding mechanism of the machine tool pulls the electrode wire 2 according to the command to overcome the pressure of the auxiliary compression spring 17 and enter between the movable clamp block 4 and the fixed clamp block 3. At this time, under the instruction of the machine tool automatic wire threading system, the external power mechanism opens the wire clamp 42, releases the clamped wire head of the electrode wire 2, and then the machine tool automatic wire threading system pulls the wire head of the electrode wire 2 back to the corresponding wire clamp 19 of the wire reel 1, then the first cylinder shaft 10 retreats, releasing the pushing pressure on the active end of the lever 5, and then the lever 5 swings forward around the support shaft 16 under the action of the elastic force of the main compression spring 6, pushing the movable clamp 4 to clamp the electrode wire 2, completing the automatic clamping of the electrode wire 2 by the wire reel 1.

[0096] If the machine tool needs to recycle the electrode wire 2 to prepare for the next automatic wire threading, at this time, a wire clamp 19 of the wire reel 1 runs to the wire clamping and releasing position at the bottom of the wire reel 1 under the command of the machine tool automatic wire threading system, and the first cylinder shaft 10 pushes the active end of the lever 5 forward to open the wire clamp 19. Then the machine tool automatic wire threading system withdraws the electrode wire 2 from the wire clamp 19 to the command position and the first cylinder shaft 10 retreats.

[0097] In this embodiment, the wire drum 1 is evenly provided with three wire clamps 19 along the circumferential direction (of course, the present invention is not limited thereto), so that when the wire clamp 19 finds the wire clamping and releasing position, the automatic wire threading system of the machine tool can transfer the nearest wire clamp 19 to the wire clamping and releasing position, thereby improving the efficiency of automatic wire threading. The second cylinder shaft 26 is arranged at the wire clamping and releasing position at the top of the wire drum 1, so that the wire clamp 19 can be manually operated when it runs to the top of the wire drum 1, and the wire clamp 19 is opened and locked by the second cylinder 25 to manually clamp and release the wire.

[0098] In addition, it should be noted that: in addition to the air cylinder, the linear drive device can also use a hydraulic cylinder, a linear motor, a solenoid valve, a cam push rod mechanism, a lever mechanism, or a linear drive mechanism composed of a motor and a screw nut, which can be understood by those skilled in the art. 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 this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic wire clamping and releasing wire reel for an automatic wire threading electric spark wire cutting machine tool, comprising a wire reel (1), the wire reel (1) being rotatably supported on a support seat (11), the support seat (11) being fixed on a wire reel carriage (12), characterized in that: A wire clamp (19) for clamping the electrode wire (2) and having a normally closed clamping opening, and an opening mechanism external to the wire barrel (1) are provided on the wire barrel (1); The wire clamp (19) comprises a fixed clamp block (3), a movable clamp block (4), a lever (5), a main compression spring (6) and an auxiliary compression spring (17), wherein: The fixed clamping block (3) is a fixed clamping body of the wire clamp (19), the fixed clamping block (3) is fixedly connected to the outer cylindrical surface of the wire drum (1), and a fixed wire clamping surface (8) is provided on the fixed clamping block (3), and the circumferential winding direction of the electrode wire (2) on the outer cylindrical surface of the wire drum (1) is consistent; The movable clamping block (4) is a movable clamping body of the wire clamp (19). The movable clamping block (4) is movably connected to the outer cylinder of the wire reel (1). A movable wire clamping surface (9) is provided on the movable clamping block (4). In the assembled state, the movable wire clamping surface (9) faces the fixed wire clamping surface (8) and is arranged face to face. The moving direction of the movable clamping block (4) is parallel to the axial direction of the wire reel (1). The lever (5) is a rod member in the wire clamp (19) used to operate and control the opening and closing of the clamping jaws. The lever (5) is rotatably supported on the outer cylindrical surface of the wire drum (1) with the rotation fulcrum as a reference. One of the two ends of the lever (5) serves as an active end, and the other end serves as a driven end. The main compression spring (6) is an elastic element in the wire clamp (19) for providing a first elastic force. The main compression spring (6) acts on the active end of the lever (5) to cause the lever (5) to swing in a positive direction around the rotation fulcrum. The driven end of the lever (5) acts on the movable clamp block (4) and forces the movable clamping surface (9) of the movable clamp block (4) and the fixed clamping surface (8) of the fixed clamp block (3) to press and close the clamping mouth, thereby forming a wire clamp (19) with a normally closed clamping mouth. The auxiliary pressure spring (17) is an elastic element in the wire clamp (19) for providing a second elastic force. The auxiliary pressure spring (17) is arranged between the surfaces of the driven end of the lever (5) and the moving clamp block (4) opposite to each other. The elastic force of the auxiliary pressure spring (17) acts in a direction parallel to the axial direction of the wire drum (1). The elastic force of the auxiliary pressure spring (17) is smaller than the elastic force of the main pressure spring (6). The opening mechanism is a linear drive device having a controlled pressure output end, which is positioned and mounted on the support seat (11) and is externally arranged relative to the wire reel (1). The pressure output end is located on one side of the circular path along which the active end of the lever (5) rotates with the wire reel (1). In a working state, when the active end of the lever (5) rotates with the wire reel (1) and stays directly opposite to the pressure output end, the pressure output end acts on the active end of the lever (5) to overcome the direction of the elastic force of the main compression spring (6) and force the lever (5) to swing in the opposite direction around the rotation fulcrum, thereby releasing the pressing force of the main compression spring (6) on the movable clamp (4) through the driven end of the lever (5).

2. The automatic wire clamping and releasing wire drum according to claim 1 is characterized in that: The lever (5) is arranged along the circumferential direction of the outer cylindrical surface of the wire drum (1) and is rotatably positioned by a support shaft (16) at the rotation fulcrum. The support shaft (16) is positioned on the outer cylinder of the wire drum (1). The axis of the support shaft (16) is arranged along the radial direction of the wire drum (1). The elastic force of the main compression spring (6) acts in a direction parallel to the axial direction of the wire drum (1).

3. The automatic wire clamping and releasing wire drum according to claim 1 is characterized in that: A first placement hole (34) and a second placement hole (40) are provided between the lever (5) and the movable clamp block (4) at a position corresponding to the auxiliary pressure spring (17); the first placement hole (34) is provided on the movable clamp block (4), and the second placement hole (40) is provided on the lever (5); in an assembled state, one end of the auxiliary pressure spring (17) is placed in the first placement hole (34), and the other end is placed in the second placement hole (40).

4. The automatic wire clamping and releasing drum according to claim 1 is characterized in that: The side of the fixed clamping block (3) that fits with the outer cylindrical surface of the wire drum (1) is designed as an arc surface, and the side of the movable clamping block (4) that fits with the outer cylindrical surface of the wire drum (1) is designed as an arc surface. The diameters of the arc surfaces of the fixed clamping block (3) and the movable clamping block (4) are consistent with the diameter of the outer cylindrical surface of the wire drum (1). In the assembled state, the fixed clamping block (3) and the movable clamping block (4) are both fitted with the outer cylindrical surface of the wire drum (1) through the arc surfaces.

5. The automatic wire clamping and releasing drum according to claim 4 is characterized in that: The fixed wire clamping surface (8) of the fixed clamping block (3) is designed as a micro-slope (20) that contracts inwardly at a position close to the outer cylindrical surface of the wire drum (1). The height of the micro-slope (20) in the radial direction of the wire drum (1) is greater than or equal to the diameter of the electrode wire (2), and the amount of retraction in the axial direction of the wire drum (1) is less than the diameter of the electrode wire (2). It plays a positioning role for the electrode wire (2) entering the wire clamp (19) when it is close to the fixed wire clamping surface (8).

6. The automatic wire clamping and releasing wire drum according to claim 4, characterized in that: The upper portion of the fixed wire clamping surface (8) of the fixed clamping block (3) is designed as an inclined surface or an arc surface, and the upper portion of the movable wire clamping surface (9) of the movable clamping block (4) is designed as an inclined surface or an arc surface. The inclined surface or the arc surface of the fixed clamping block (3) and the inclined surface or the arc surface of the movable clamping block (4) form a V-shaped guide opening (39) to guide the electrode wire (2) entering the wire clamp (19).

7. The automatic wire clamping and releasing drum according to claim 4 is characterized in that: The fixed clamp block (3) is provided with side inclined surfaces (21) at both end positions corresponding to the circumferential direction of the wire drum (1), and the side inclined surfaces (21) form an acute angle with the circumferential direction of the wire drum (1), so that the electrode wire (2) clamped in the wire clamp (19) avoids the winding path of the electrode wire (2) when it is spirally wound on the wire drum (1).

8. The automatic wire clamping and releasing wire drum according to claim 1 is characterized in that: A cylindrical pressure head (18) is arranged on the upper side of the driven end of the lever (5) facing the moving clamp block (4), and a force-bearing surface is arranged on the moving clamp block (4) for the cylindrical pressure head (18). In the working state, the cylindrical pressure head (18) on the driven end of the lever (5) cooperates with the force-bearing surface on the moving clamp block (4).

9. The automatic wire clamping and releasing wire drum according to claim 1, characterized in that: A movable clamp block positioning ring (14) is provided for the movable clamp block (4). The movable clamp block positioning ring (14) is an annular component. In the assembled state, the movable clamp block positioning ring (14) is fixed in the circumferential direction of the outer cylinder of the wire drum (1) where the movable clamp block (4) is located. The movable clamp block positioning ring (14) is provided with a guide groove (15) at the position where the movable clamp block (4) is located along the moving direction of the movable clamp block (4). The movable clamp block (4) is located in the guide groove (15) and moves in coordination with the guide groove (15).

10. The automatic wire clamping and releasing wire drum according to claim 9, characterized in that: The movable clamping block (4) is provided with cylindrical guide bodies (22) at both ends of the corresponding wire drum (1) in the circumferential direction. The cylindrical guide bodies (22) are slidably matched with the corresponding groove body surfaces on both sides and the upper side of the guide groove (15) to form a sliding guide pair.

11. The automatic wire clamping and releasing wire drum according to claim 9, characterized in that: The side surface of the movable clamping block positioning ring (14) close to the fixed clamping surface (8) of the fixed clamping block (3) is perpendicular to the axis of the wire drum (1) and has a gap with the fixed clamping surface (8) of the fixed clamping block (3).

12. The automatic wire clamping and releasing wire drum according to claim 9, characterized in that: A main compression spring countersunk hole (27) is provided at the active end of the lever (5), the axis of the main compression spring countersunk hole (27) is parallel to the axis of the wire drum (1), a through main compression spring through hole (28) is provided at a position of the movable clamp block positioning ring (14) corresponding to the main compression spring countersunk hole (27), the main compression spring through hole (28) is a threaded hole and is coaxial with the main compression spring countersunk hole (27), in the assembled state, one end of the main compression spring (6) is placed in the main compression spring countersunk hole (27), the other end of the main compression spring (6) is placed in one end of the main compression spring through hole (28), a set screw (29) is screwed in from the other end of the main compression spring through hole (28) and compresses the length of the main compression spring (6) to adjust the elastic force of the main compression spring (6).

13. The automatic wire clamping and releasing wire drum according to claim 2, characterized in that: A lever support ring (23) is provided for the lever (5). The lever support ring (23) is an annular component. In the assembled state, the lever support ring (23) is fixed in the circumferential direction of the outer cylindrical surface of the wire tube (1) where the lever (5) is located. The lever support ring (23) is provided with a spatial groove (24) at the position where the lever (5) is located, and the lever (5) is arranged in the spatial groove (24).

14. The automatic wire clamping and releasing wire drum according to claim 13, characterized in that: The lever support ring (23) is provided with an extended positioning arm (30) for the lever (5), and the positioning arm (30) is located on the outer side of the lever (5) relative to the wire reel (1). The positioning arm (30) is provided with a positioning hole (31) directly opposite to the rotation fulcrum of the lever (5), and a mounting hole (32) is provided on the wire reel (1) corresponding to the position of the positioning hole (31). The axes of the positioning hole (31) and the mounting hole (32) are arranged radially along the wire reel (1). In the assembled state, the support shaft (16) rotates and positions the lever (5) at the rotation fulcrum through the positioning hole (31) and the mounting hole (32).

15. The automatic wire clamping and releasing wire drum according to claim 14, characterized in that: The lever (5) is provided with a radial hole (33) at the rotation fulcrum, and the radial hole (33) is sleeved on the support shaft (16) so that the lever (5) can swing around the support shaft (16).

16. The automatic wire clamping and releasing wire drum according to claim 1, characterized in that: The wire clamps (19) are composed of at least two, each of which is evenly arranged in the circumferential direction of the wire reel (1), and each of which is located on the same cross section of the wire reel (1) that is perpendicular to the axis of the wire reel (1).

17. The automatic wire clamping and releasing wire drum according to claim 1, characterized in that: The linear drive device is an air cylinder, a hydraulic cylinder, a linear motor, a solenoid valve, a cam push rod mechanism, a lever mechanism, or a linear drive mechanism composed of a motor and a lead screw nut.

18. The automatic wire clamping and releasing wire drum according to claim 17, characterized in that: The cylinder is composed of a first cylinder (7) and a second cylinder (25), the first cylinder (7) having a first cylinder axis (10), the second cylinder (25) having a second cylinder axis (26), the axes of the first cylinder axis (10) and the second cylinder axis (26) being parallel to the axis of the wire reel (1), the first cylinder axis (10) and the second cylinder axis (26) being both located on one side of a circular path of the active end of the lever (5) rotating with the wire reel (1), wherein the second cylinder axis (26) is arranged at a wire clamping and releasing position corresponding to the top of the wire reel (1), and the first cylinder axis (10) is arranged at a wire clamping and releasing position corresponding to the bottom of the wire reel (1).

Images