Posture-adjustable automatic wire feeding mechanism of wire clamping and drawing device of numerical control wire cut electric discharge machine tool

Abstract

A posture-adjustable automatic wire feeding mechanism of a wire clamping and drawing device of a numerical control wire cut electrical discharge machine is characterized by comprising a wire clamping and drawing trolley, a guide rail and a trolley traction mechanism. The wire clamping and drawing trolley is a wire clamping and drawing device which is arranged on a lower wire feeding path and used for clamping and feeding electrode wire heads, a normally-closed wire clamp, a first guide wheel and a second guide wheel are arranged on a trolley body of the wire clamping and drawing trolley, and the guide rail is a double-rail guide rail or a single-rail guide rail which is arranged on the lower wire feeding path and used for guiding and adjusting the posture of the wire clamping and drawing trolley. A bent or bent posture adjusting section is arranged on the front section rail, the wire clamping and drawing trolley is kept in a horizontal posture when entering the front section position from the middle section, and when the trolley traction mechanism drives the wire clamping and drawing trolley to move towards the front end position, the wire clamping and drawing trolley gradually swings from the horizontal posture to the vertical posture and is located below a wire guide hole of the lower wire guide head. A wire head guide hole in the front end of the wire clamping and drawing trolley is right opposite to a wire head of an electrode wire to vertically penetrate out of the wire guide hole.

Description

Technical Field

[0001] The present invention relates to the technical field of wire-cut electric discharge machining, and in particular to an adjustable posture automatic lower wire feeding mechanism for a wire-drawing device of a CNC reciprocating wire-cut electric discharge machine. The lower wire feeding mechanism is used to automatically clamp the electrode wire head passing through the lower wire guide nozzle and the lower main guide wheel mechanism (referred to as "lower wire guide head") of the machine tool, and then pull it to the lower part of the wire drum of the machine tool and allow the electrode wire to enter the automatic wire clamp of the wire drum. 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 to automatically pull the electrode wire head passing through the lower wire guide head (lower wire guide nozzle and lower main guide wheel mechanism) to the lower part of the wire drum of the machine tool and make the electrode wire enter the automatic wire clamp of the wire drum is one of the technical difficulties that need to be overcome.

[0003] In an automatic wire-threading CNC reciprocating wire EDM machine, after the automatic wire-threading system passes the electrode wire through the lower wire guide head, the existing technology usually uses a wire guide tube with a roller-down wire feeding mechanism as the power, and uses a pressure fluid (gas or liquid) as the auxiliary to directly guide the soft and thin electrode wire into the automatic wire clamp of the machine tool wire barrel, but this solution has shortcomings: first, the mechanism transmits the soft and thin electrode wire over a long distance, and the electrode wire is prone to instability during transmission, making transmission difficult; second, the mechanism has a long wire guide tube, and in actual use, thick electric spark erosion products are easily accumulated in the inner hole of the wire guide tube, resulting in blockage of the wire guide channel, causing failure of automatic wire threading; third, the mechanism is also equipped with a roller-down wire feeding mechanism and a liquid and gas guide nozzle, and the structure is complex and difficult to disassemble and clean.

[0004] In view of this, the present invention proposes an automated lower wire feeding mechanism suitable for automatic wire threading of an electric spark wire cutting machine tool to solve the technical problem and ensure the success of automatic wire threading at the bottom of the machine tool. Summary of the invention

[0005] The present invention provides an automatic downward wire feeding mechanism with adjustable posture for a wire drawing device of a CNC electric spark wire cutting machine, and its purpose is to solve the problem of automatic wire threading reliability in a path in which an electrode wire coming out of a lower wire guide head (lower wire guide nozzle and lower main guide wheel mechanism) of the machine tool is automatically clamped and then drawn to the lower part of a wire drum and then fed into an automatic wire clamp of the wire drum.

[0006] To achieve the above purpose, the first technical solution adopted by the present invention is: a CNC electric spark wire cutting machine tool wire drawing clamp with adjustable posture and automatic wire feeding mechanism, the innovation of which lies in: including a wire drawing trolley, a guide rail and a trolley traction mechanism.

[0007] The wire head position of the electrode wire that vertically passes through the wire guide hole of the lower wire guide head of the machine tool starts to move downward and bypass the lower main guide wheel, and then is horizontally passed through the wire to the position below the wire drum. This is the lower wire feeding path of the machine tool. The lower wire feeding path is divided into a front section, a middle section, and a rear section. The wire head position is the front end position in the front section, and the position below the wire drum is the rear end position in the rear section.

[0008] The wire drawing trolley is a wire drawing device used for clamping the electrode wire head and feeding the wire on the lower wire feeding path. The body of the wire drawing trolley is provided with a normally closed wire clamp, a first guide wheel and a second guide wheel. The body of the wire drawing trolley is defined as having a horizontal posture, a vertical posture and an inclined posture when working. When the body is in a horizontal posture, the front and rear direction of the body is defined as the X-axis direction, the left and right direction is the Y-axis direction, and the up and down direction is the Z-axis direction with the center of the body as the base point.

[0009] The normally closed wire clamp is arranged at the front part of the wire drawing trolley, and a wire head guide hole is arranged at the front part of the normally closed wire clamp. The normally closed wire clamp is composed of a clamping mechanism for clamping the electrode wire head and a spring for forcing the clamping mechanism to be in a normally closed state. In the assembled state, the spring acts on the clamping mechanism to make the clamping mechanism in a normally closed state, thereby forming a normally closed wire clamp.

[0010] One of the first guide wheel and the second guide wheel is arranged on one side of the vehicle body, and the other is arranged on the other side of the vehicle body, and the first guide wheel and the second guide wheel are on opposite sides of the vehicle body. The first guide wheel is rotatably connected to the vehicle body through a first wheel axle, and the second guide wheel is rotatably connected to the vehicle body through a second wheel axle. The first wheel axle axis and the second wheel axle axis are both parallel to the Y-axis direction, and when the vehicle body is in a horizontal posture, the projections of the first wheel axle axis and the second wheel axle axis in the X-axis direction are a distance apart, wherein the first guide wheel is located at the front end of the wire clamping trolley.

[0011] The guide track is a track used to guide and adjust the posture of the wire drawing trolley on the lower wire feeding path. The guide track is composed of a double-track guide track consisting of a first guide track and a second guide track. The first guide track and the second guide track are both composed of a guide groove or a guide plate, wherein the first guide wheel is guided and matched with the guide groove or the guide plate of the first guide track, and the two side surfaces of the guide groove or the guide plate of the first guide track are the guide surfaces of the first guide wheel, and the two side surfaces are parallel to each other and perpendicular to the XZ plane. The second guide wheel is guided and matched with the guide groove or the guide plate of the second guide track, and the two side surfaces of the guide groove or the guide plate of the second guide track are the guide surfaces of the second guide wheel, and the two side surfaces are parallel to each other and perpendicular to the XZ plane.

[0012] The first guide rail and the second guide rail are respectively provided with a front rail, a middle rail and a rear rail corresponding to the front section, the middle section and the rear section of the lower wire feeding path, and the front rail, the middle rail and the rear rail are smoothly connected, wherein the head end position of the front rail corresponds to the front end position, and the tail end position of the rear rail corresponds to the rear end position. A curved or bent posture adjustment section is provided on at least one of the front rail of the first guide rail and the front rail of the second guide rail, and the guide surface of the posture adjustment section guides the wire drawing trolley to bypass the lower main guide wheel on the lower wire feeding path while changing its own posture.

[0013] The trolley traction mechanism is a mechanism used to push and pull the wire drawing trolley on the lower wire feeding path. The wire drawing trolley has a traction end. The first guide rail and the second guide rail are used to constrain the movement direction, position and posture of the wire drawing trolley, and guide the wire drawing trolley to move in a plane parallel to the XZ plane. The trolley traction mechanism drives the wire drawing trolley to push forward or pull backward between the front end position and the rear end position through the traction end.

[0014] Under the working state, the wire drawing trolley maintains a horizontal posture when entering the front position from the middle section. When the trolley traction mechanism drives the wire drawing trolley to move to the front end position in the front section of the lower wire feeding path, on the one hand, the first guide wheel on one side of the wire drawing trolley is constrained by the front section of the first guide track, and on the other hand, the second guide wheel on the other side of the wire drawing trolley is constrained by the front section of the second guide track. Since the wire drawing trolley is subject to doubly constraints at the same time, the wire drawing trolley gradually swings from a horizontal posture during the movement until it reaches the front position and presents a vertical posture. In the vertical posture, the wire drawing trolley is located below the wire guide hole of the lower wire guide head, and the wire head guide hole provided at the front end of the wire drawing trolley is opposite to the wire head of the electrode wire that will vertically pass through the wire guide hole.

[0015] The relevant contents in the above-mentioned first technical solution are explained as follows: 1. In the first technical solution mentioned above, the "normally closed wire clamp" refers to a wire clamp that is always in a closed clamping state without external force intervention. Normally closed is relative to normally open. The wire clamp is a mechanism used to clamp the electrode wire head. A normally closed wire clamp can be directly formed by spring compression, or a lever mechanism and a spring combination can be used to form a normally closed wire clamp, or a normally closed solenoid valve can be used to form a normally closed wire clamp, etc.

[0016] 2. In the above-mentioned first technical solution, the "lower wire guide head of the machine tool" refers to the lower wire guide nozzle and the lower main guide wheel mechanism of the machine tool.

[0017] 3. In the above-mentioned first technical solution, the front track of the guide track includes the following variations: (1) The front section of the first guide rail is the first front attitude adjustment rail, and the projection trajectory of the first front attitude adjustment rail on the XZ plane is formed by smoothly connecting a first horizontal straight line segment, a second arc segment or a second inclined segment, and a third vertical straight line segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front, the second arc segment or the second inclined segment is an arc segment or an inclined segment guide groove or guide plate curved from the rear lower part to the front upper part, and the third vertical straight line segment is a straight line segment guide groove or guide plate parallel to the Z-axis from bottom to top.

[0018] The front track of the second guide track is the second front posture adjustment track, and the trajectory of the second front posture adjustment track is a straight line segment parallel to the X-axis. The straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front.

[0019] (2) The front section of the first guide rail is the first front attitude adjustment rail, and the projection trajectory of the first front attitude adjustment rail on the XZ plane is formed by smoothly connecting a first horizontal straight line segment and a second arc segment or a second inclined segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front, and the second arc segment or the second inclined segment is a circular arc segment or an inclined segment guide groove or guide plate that bends from the rear lower part to the front upper part.

[0020] The front track of the second guide track is the second front posture adjustment track, and the trajectory of the second front posture adjustment track is a straight line segment parallel to the X-axis. The straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front.

[0021] (3) The front section of the first guide rail is the first front attitude adjustment rail, and the projection trajectory of the first front attitude adjustment rail on the XZ plane is formed by smoothly connecting a first horizontal straight line segment and a second arc segment or a second inclined segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front, and the second arc segment or the second inclined segment is a circular arc segment or an inclined segment guide groove or guide plate curved from the rear lower part to the front upper part.

[0022] The front section of the second guide rail is the second front posture adjustment rail, and the projection trajectory of the second front posture adjustment rail in the XZ plane is formed by smoothly connecting the first horizontal straight line segment and the second arc segment or the second inclined segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front, and the second arc segment or the second inclined segment is an arc segment or inclined segment guide groove or guide plate that bends from the upper rear to the lower front.

[0023] 4. In the above-mentioned first technical solution, the rear track of the guide track is as follows: The rear section of the first guide rail is the first rear attitude adjustment rail, and the rear section of the second guide rail is the second rear attitude adjustment rail. Both the first rear attitude adjustment rail and the second rear attitude adjustment rail are provided with lifting sections that are bent upward or unbent. Both lifting sections are located below the wire reel and are arranged circumferentially around the wire reel. The guide surfaces of both lifting sections guide the wire drawing trolley to feed the electrode wire into the wire clamp of the wire reel.

[0024] Under working condition, when the wire drawing trolley enters the rear section from the middle section, it maintains a horizontal posture. When the trolley traction mechanism pulls the wire drawing trolley to move to the rear end position on the rear section of the lower wire feeding path, on the one hand, the first guide wheel on one side of the wire drawing trolley is constrained by the first rear attitude adjustment track of the first guide track, and on the other hand, the second guide wheel on the other side of the wire drawing trolley is constrained by the second rear attitude adjustment track of the second guide track. Since the wire drawing trolley is subject to dual constraints at the same time, the wire drawing trolley gradually swings from a horizontal posture under the action of the upwardly bent or bent lifting section. When it reaches the rear end position, the wire drawing trolley is lifted a certain distance in the Z-axis direction and presents an inclined posture with the front part tilted downward. During the lifting and turning movement of the wire drawing trolley, the electrode wire pulled backward is simultaneously fed into the wire clamp of the wire drum, and the pulled electrode wire is tangent to the outer cylindrical surface of the wire drum.

[0025] 5. In the above-mentioned first technical solution, the rear track of the guide track includes the following variations: (1) The projection tracks of the first rear attitude adjustment track and the second rear attitude adjustment track on the XZ plane are formed by smoothly connecting a first horizontal straight line segment, a second arc segment and a third inclined straight line segment in sequence from front to back, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from front to back, the second arc segment is an arc segment guide groove or guide plate curved from the front lower to the rear upper, and the third inclined straight line segment is a straight line segment guide groove or guide plate inclined from the front lower to the rear upper.

[0026] (2) The projection trajectories of the first rear attitude adjustment track and the second rear attitude adjustment track on the XZ plane are formed by smoothly connecting the first horizontal straight line segment and the second inclined straight line segment in sequence from front to back, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from front to back, and the second inclined straight line segment is a straight line segment guide groove or guide plate inclined from the front lower to the rear upper.

[0027] 6. In the above-mentioned first technical solution, the middle sections of the first guide rail and the second guide rail are both horizontal straight sections parallel to the X-axis direction. In the working state, when the wire drawing trolley enters the middle section position, it maintains a horizontal posture.

[0028] 7. In the above-mentioned first technical solution, the trolley traction mechanism includes a chain, a sprocket and a drive motor.

[0029] The chain is an open-loop chain, that is, the head and tail of the chain are not connected to form a chain ring. The chain is a roller chain composed of a chain roller, a chain roller shaft and a chain plate, wherein a chain roller at the head end of the chain serves as a second guide wheel, and the chain roller shaft corresponding to the second guide wheel serves as a second wheel shaft. The second guide track serves as a chain guide rail, which is fixedly laid between the front end position and the rear end position of the lower wire feeding path relative to the lower wire arm of the machine tool. The chain guide rail has a T-shaped guide groove that accommodates each chain roller and a side chain plate on the chain and can be guided and matched. In the assembled state, the chain roller and a side chain plate of the chain are guided and matched with the T-shaped guide groove of the chain guide rail and can slide as a whole along the direction of the T-shaped guide groove. The chain roller shaft as the second wheel shaft also serves as a push-pull traction point, which is rotatably connected to the traction end of the wire drawing trolley.

[0030] The driving motor and the sprocket are positioned and installed on a relatively stationary component with respect to the lower line arm of the machine tool. The driving motor is transmission-connected with the sprocket, and the sprocket is meshed with the chain.

[0031] Thus, a traction mechanism capable of pushing forward or pulling backward the wire drawing trolley to move along the lower wire feeding path is formed by the cooperation of the chain guide rail, the open-loop chain, the sprocket and the drive motor.

[0032] 8. In the above-mentioned first technical solution, an arc-shaped chain guide is provided in the meshing section between the chain and the sprocket, and the radius of the arc-shaped chain guide matches the radius of the sprocket, so that the chain can go around along the arc-shaped chain guide and naturally droop at the lower end outlet under the action of its own gravity.

[0033] 9. In the above-mentioned first technical solution, a chain storage box capable of storing the chain is arranged below the naturally drooping chain, the horizontal cross-section of the box cavity of the chain storage box is a rectangular cross-section, the width of the rectangular cross-section is adapted to the width of the chain, the length of the rectangular cross-section is at least greater than the length of one chain section, and the box cavity has a depth capable of storing the chain in the natural drooping direction of the chain. When the chain moves backward along the chain guide and naturally droops from the lower end outlet of the arc-shaped chain guide, under the action of the chain's gravity and its own flexibility and the constraint of the chain storage box, a part of the naturally drooping section of the chain is stacked in the chain storage box.

[0034] 10. In the above-mentioned first technical solution, the trolley traction mechanism can also adopt a belt and pulley drive mechanism, a rope and pulley drive mechanism.

[0035] 11. In the above-mentioned first technical scheme, a pressure point for opening the clamping mechanism is provided on the wire drawing trolley corresponding to the spring on the normally closed wire clamp, and a trolley wire clamp opening mechanism is provided corresponding to the pressure point. The trolley wire clamp opening mechanism is a pressure mechanism capable of opening the normally closed wire clamp on the wire drawing trolley, and the pressure mechanism consists of two sets of front-end pressure mechanisms and rear-end pressure mechanisms. The front-end pressure mechanism is positioned and installed at the front end position and is externally arranged relative to the pressure point of the normally closed wire clamp of the wire drawing trolley, and the rear-end pressure mechanism is positioned and installed at the rear-end position and is externally arranged relative to the pressure point of the normally closed wire clamp of the wire drawing trolley. The front-end pressing mechanism is provided with a front pressing output end controlled by the automatic wire threading system of the machine tool. In the working state, when the wire-clamping trolley runs to the front position, the front pressing output end is extended under the control of the automatic wire threading system of the machine tool and acts on the pressing point of the normally closed wire clamp to overcome the spring force to open the clamping mechanism on the wire-clamping trolley. When the wire head of the electrode wire is fed into the clamping mechanism, the front pressing output end is retracted to close the clamping mechanism to complete the wire clamping. The rear-end pressing mechanism is provided with a rear pressing output end controlled by the automatic wire threading system of the machine tool. In the working state, when the wire-clamping trolley runs to the rear position and feeds the electrode wire from the bottom of the wire drum into the wire clamp of the wire drum, the rear pressing output end is extended under the control of the automatic wire threading system of the machine tool and acts on the pressing point of the normally closed wire clamp to overcome the spring force to open the clamping mechanism on the wire-clamping trolley to complete the wire release.

[0036] 12. In the above-mentioned first technical solution, the front-end pressing mechanism is a front cylinder having a front extension end, which serves as a front pressing output end; the rear-end pressing mechanism is a rear cylinder having a rear extension end, which serves as a rear pressing output end.

[0037] 13. In the above-mentioned first technical solution, the front end pressing mechanism and the rear end pressing mechanism both adopt electromagnets, cam mechanisms, lever mechanisms or crank-connecting rod mechanisms.

[0038] To achieve the above purpose, the second technical solution adopted by the present invention is: a CNC electric spark wire cutting machine tool wire drawing clamp with adjustable posture and automatic wire feeding mechanism, the innovation of which lies in: including a wire drawing trolley, a guide rail and a trolley traction mechanism.

[0039] The wire head position of the electrode wire that vertically passes through the wire guide hole of the lower wire guide head of the machine tool starts to move downward and bypass the lower main guide wheel, and then is horizontally passed through the wire to the position below the wire drum. This is the lower wire feeding path of the machine tool. The lower wire feeding path is divided into a front section, a middle section, and a rear section. The wire head position is the front end position in the front section, and the position below the wire drum is the rear end position in the rear section.

[0040] The wire drawing trolley is a wire drawing device used for clamping the electrode wire head and feeding the wire on the lower wire feeding path. The body of the wire drawing trolley is provided with a normally closed wire clamp, a first guide wheel and a second guide wheel. The body of the wire drawing trolley is defined as having a horizontal posture, a vertical posture and an inclined posture when working. When the body is in a horizontal posture, the front and rear direction of the body is defined as the X-axis direction, the left and right direction is the Y-axis direction, and the up and down direction is the Z-axis direction with the center of the body as the base point.

[0041] The normally closed wire clamp is arranged at the front part of the wire drawing trolley, and a wire head guide hole is arranged at the front part of the normally closed wire clamp. The normally closed wire clamp is composed of a clamping mechanism for clamping the electrode wire head and a spring for forcing the clamping mechanism to be in a normally closed state. In the assembled state, the spring acts on the clamping mechanism to make the clamping mechanism in a normally closed state, thereby forming a normally closed wire clamp.

[0042] The first guide wheel and the second guide wheel are arranged on the same side of the vehicle body. The first guide wheel is rotatably connected to the vehicle body through the first wheel axle, and the second guide wheel is rotatably connected to the vehicle body through the second wheel axle. The first wheel axle axis and the second wheel axle axis are both parallel to the Y-axis direction, and when the vehicle body is in a horizontal posture, the projections of the first wheel axle axis and the second wheel axle axis in the X-axis direction are a distance apart, wherein the first guide wheel is located at the front end position of the wire clamping trolley for clamping the wire.

[0043] The guide track is a track used to guide and adjust the posture of the wire drawing trolley on the lower wire feeding path. The guide track is composed of a single-rail guide track, and the single-rail guide track is composed of a guide groove or a guide plate. The first guide wheel and the second guide wheel are simultaneously guided and cooperated with the guide groove or the guide plate of the single-rail guide track. The two side surfaces of the guide groove or the guide plate of the single-rail guide track simultaneously serve as guide surfaces for the first guide wheel and the second guide wheel, and the two side surfaces are parallel to each other and perpendicular to the XZ plane.

[0044] The monorail guide track is provided with a front track, a middle track and a rear track respectively corresponding to the front section, the middle section and the rear section of the lower wire feeding path, and the front track, the middle track and the rear track are smoothly connected, wherein the head end position of the front track corresponds to the front end position, and the tail end position of the rear track corresponds to the rear end position. A curved or bent posture adjustment section is provided on the front track of the monorail guide track, and the guide surface of the posture adjustment section guides the wire drawing trolley to bypass the lower main guide wheel on the lower wire feeding path while changing its own posture.

[0045] The trolley traction mechanism is a mechanism used to push and pull the wire drawing trolley on the lower wire feeding path. The wire drawing trolley has a traction end. The single-rail guide track is used to constrain the movement direction and position of the wire drawing trolley, and guide the wire drawing trolley to move in a plane parallel to the XZ plane. The trolley traction mechanism drives the wire drawing trolley to push forward or pull backward between the front end position and the rear end position through the traction end.

[0046] Under working condition, when the wire drawing trolley enters the front position from the middle section, it maintains a horizontal posture. When the trolley traction mechanism drives the wire drawing trolley to move to the front end position at the front section of the lower wire feeding path, the first guide wheel and the second guide wheel of the wire drawing trolley are simultaneously constrained by the front section track of the monorail guide track. The wire drawing trolley gradually swings from a horizontal posture during the movement until it reaches the front end position and presents a vertical posture. In the vertical posture, the wire drawing trolley is located below the wire guide hole of the lower wire guide head, and the wire head guide hole at the front end of the wire drawing trolley is opposite to the wire head of the electrode wire that is about to pass vertically through the wire guide hole.

[0047] The relevant contents in the above second technical solution are explained as follows: 1. In the above second technical solution, the "normally closed wire clamp" refers to the wire clamp being in a closed clamping state without external force intervention. Normally closed is relative to normally open. The wire clamp is a mechanism used to clamp the electrode wire head. A normally closed wire clamp can be directly formed by spring compression, or a lever mechanism and a spring can be combined to form a normally closed wire clamp, or a normally closed solenoid valve can be used to form a normally closed wire clamp, etc.

[0048] 2. In the above-mentioned second technical solution, the "lower wire guide head of the machine tool" refers to the lower wire guide nozzle and the lower main guide wheel mechanism of the machine tool.

[0049] 3. In the above-mentioned second technical solution, the trolley traction mechanism includes a chain, a sprocket and a drive motor.

[0050] The chain is an open-loop chain, that is, the head and tail of the chain are not connected to form a chain ring. The chain is a roller chain composed of a chain roller, a chain roller shaft and a chain plate, wherein a chain roller at the head end of the chain serves as the second guide wheel, and the chain roller shaft corresponding to the second guide wheel serves as the second wheel shaft. The first guide wheel alone uses a chain roller independent of the chain, and the first wheel shaft alone uses a chain roller shaft independent of the chain. The monorail guide track serves as a chain guide rail, which is fixedly laid between the front end position and the rear end position of the lower wire feeding path relative to the lower wire arm of the machine tool, and the chain guide rail has a T-shaped guide groove that accommodates each chain roller and a chain plate on one side of the chain and can perform guiding cooperation. In the assembled state, the chain and the chain roller independent of the chain and the chain plate on one side are guided and cooperated with the T-shaped guide groove of the chain guide rail and can slide as a whole along the direction of the T-shaped guide groove. The chain roller shaft serving as the second wheel axle also serves as a push-pull traction point, which is rotatably connected to the traction end of the wire drawing trolley.

[0051] The driving motor and the sprocket are positioned and installed on a relatively stationary component with respect to the lower line arm of the machine tool. The driving motor is transmission-connected with the sprocket, and the sprocket is meshed with the chain.

[0052] Thus, a traction mechanism capable of pushing forward or pulling backward the wire drawing trolley to move along the lower wire feeding path is formed by the cooperation of the chain guide rail, the open-loop chain, the sprocket and the drive motor.

[0053] Due to the application of the above scheme, the present invention has the following advantages and effects compared with the prior art: 1. The present invention utilizes a double-track guide rail or a single-track guide rail in conjunction with two guide wheels arranged front and rear, thereby ingeniously achieving posture adjustment (posture adjustment) and control of the wire drawing trolley during operation.

[0054] 2. When the trolley traction mechanism of the present invention drives the wire-drawing trolley forward, the wire-drawing trolley cooperates with the front track in the guide track through two guide wheels, and the wire-drawing trolley is used to rotate around the lower main wheel, and gradually swings from a horizontal posture to a vertical posture. In the vertical posture, the wire-drawing trolley is located below the wire guide hole of the lower wire guide head, and the wire head guide hole at the front end of the wire-drawing trolley is directly opposite to the wire head of the electrode wire that will vertically pass through the wire guide hole. The electrode wire head that descends vertically from the lower wire guide nozzle of the lower wire guide head directly enters the normally closed wire clamp that has been opened by the wire-drawing trolley and is automatically clamped. Then the trolley traction mechanism pulls the wire-drawing trolley backward, and the wire-drawing trolley clamps the electrode wire and swings around the lower main wheel, and gradually swings from a vertical posture to a horizontal state. This wire threading method can reliably realize automatic wire threading and pull the electrode wire to the bottom of the machine tool wire barrel, avoiding the phenomenon of the electrode wire being blocked during the direct bending and feeding of the thin and soft electrode wire, and greatly improving the reliability of automatic wire threading of the machine tool.

[0055] 3. When the electrode wire is drawn under the wire drum of the machine tool by the wire drawing trolley, the wire drawing trolley of the present invention cooperates with the rear section track in the guide track through two guide wheels, and can pull the wire drawing trolley to rotate around the bottom of the wire drum, gradually swinging from a horizontal posture to an inclined posture with the front part tilted downward, and directly drawing the clamped electrode wire into the wire clamp of the wire drum, avoiding the use of other auxiliary mechanisms, so that the process of the electrode wire entering the wire clamp of the wire drum of the machine tool is simple, reliable and efficient.

[0056] 4. The wire-drawing trolley of the present invention is provided with automatically controllable trolley wire clamp opening mechanisms at the front end and the rear end, so that the wire-drawing trolley can automatically complete the wire clamping and releasing actions, meeting the requirements of automatic wire threading of machine tools.

[0057] 5. When the wire drawing trolley is located at the front end position and presents a vertical posture, the sensor can be used to detect whether the wire head is inserted into place, thereby transmitting the arrival signal of the electrode wire head entering the wire clamp of the wire drawing trolley to the machine tool control system, accurately judging whether the electrode wire head enters the wire clamp of the wire drawing trolley, thereby improving the reliability and accuracy of automatic wire threading of the machine tool.

[0058] 6. The present invention utilizes a rigid and flexible chain drive, two guide wheels and a guide track design to skillfully achieve traction (forward pushing or backward pulling movement), guidance and posture adjustment (posture adjustment) and control of the wire drawing trolley when it is running between the front end position and the rear end position.

[0059] 7. The present invention ingeniously uses a combination of a rigid and flexible open-loop chain and a chain guide to transport the wire-drawing trolley. The chain does not make a closed loop. When pushing and pulling the wire-drawing trolley on the lower wire feeding path, the rigidity of the chain in the chain guide is utilized to reliably complete the pushing and drawing tasks under the drive of the driving motor and the sprocket.

[0060] 8. After completing the wire drawing transmission, the chain and the wire drawing trolley of the present invention utilize the gravity and foldable flexibility of the chain to store it in a chain storage box outside the processing area. The drive motor and sprocket can also be arranged outside the processing area to avoid the adhesion of the processing etched materials. The structure is simple, the operation is reliable, and it is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Attached Figure 1 This is a front view of the posture-adjustable automatic wire feeding mechanism of the wire drawing clamp in Example 1 of the present invention.

[0062] Attached Figure 2 for Figure 1 Top view of the .

[0063] Attached Figure 3 This is the first cross-sectional view of Example 1 of the present invention, which is taken through the center of the wire drawing trolley and is parallel to the X-axis and Z-axis planes. The first cross-sectional view is a cross-sectional view observed in the opposite direction of the Y-axis. Figure 3Three wire drawing trolleys 1 are shown in the figure, but there is actually only one wire drawing trolley 1. Figure 3 The three wire-drawing trolleys 1 in the figure indicate that the same wire-drawing trolley 1 is in different positions and different postures at different times, among which, from left to right, the first one indicates that the wire-drawing trolley 1 is in the rear end position, presenting an inclined posture with the front part tilted downward; the second one indicates that the wire-drawing trolley 1 is in the middle position, presenting a horizontal posture; the third one indicates that the wire-drawing trolley 1 is in the front end position, presenting a vertical posture.

[0064] Attached Figure 4 This is the second cross-sectional view of Example 1 of the present invention, which passes through the center of the wire drawing trolley and is parallel to the X-axis and Z-axis plane. The second cross-sectional view is a cross-sectional view observed in the positive direction of the Y-axis. Figure 4 Three wire drawing trolleys 1 are shown in the figure, but there is actually only one wire drawing trolley 1. Figure 4 The three wire-drawing trolleys 1 in the figure indicate that the same wire-drawing trolley 1 is in different positions and different postures at different times, among which, from left to right, the first one indicates that the wire-drawing trolley 1 is in the rear end position, presenting an inclined posture with the front part tilted downward; the second one indicates that the wire-drawing trolley 1 is in the middle position, presenting a horizontal posture; the third one indicates that the wire-drawing trolley 1 is in the front end position, presenting a vertical posture.

[0065] Attached Figure 5 This is a first perspective schematic diagram of Example 1 of the present invention, in which the wire drawing trolley cooperates with the double-track guide track through two guide wheels located on both sides.

[0066] Attached Figure 6 This is a second perspective schematic diagram of Example 1 of the present invention, in which the wire drawing trolley cooperates with the double-track guide rail through two guide wheels located on both sides.

[0067] Attached Figure 7 This is a schematic diagram of a first scheme of the trajectory shapes of the first front attitude adjustment track and the second front attitude adjustment track in Example 1 of the present invention.

[0068] Attached Figure 8 It is a schematic diagram of a second scheme of the trajectory shapes of the first front attitude adjustment track and the second front attitude adjustment track in Example 1 of the present invention.

[0069] Attached Fig. 9 It is a schematic diagram of a third scheme of the trajectory shapes of the first front attitude adjustment track and the second front attitude adjustment track in Example 1 of the present invention.

[0070] Attached Fig.10 It is a schematic diagram of a fourth scheme of the trajectory shapes of the first front attitude adjustment track and the second front attitude adjustment track in Example 1 of the present invention.

[0071] Attached Fig.11 It is a schematic diagram of the fifth scheme of the trajectory shapes of the first front attitude adjustment track and the second front attitude adjustment track in Example 1 of the present invention.

[0072] Attached Fig.12 This is a schematic diagram of Example 2 of the present invention, in which the wire drawing trolley cooperates with the monorail guide track through two guide wheels located on one side.

[0073] In the above figures: 1. Wire drawing trolley; 2. First front attitude adjustment track; 3. Second wheel axle; 4. First guide wheel; 5. Traction end; 6. First wheel axle; 7. Wire guide hole; 8. Lower wire guide head; 9. Electrode wire; 10. Wire drum; 11. Second front attitude adjustment track; 12. First rear attitude adjustment track; 13. Second rear attitude adjustment track; 14. Wire clamp; 15. Second guide wheel; 17. Chain guide; 18. Chain; 19. Sprocket; 20. Driving motor; 21. Arc chain guide; 22. Chain storage box; 23. Second guide track; 24. First guide track; 25. Column; 26. Lower wire guide nozzle; 27. Wire head guide hole; 28. Lower wire arm; 29. ​​Lower main wheel; 30. Trolley support bar; 31. Front cylinder; 32. Rear cylinder; 33. Chain roller; 34. Chain roller shaft. DETAILED DESCRIPTION

[0074] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Embodiment 1: A posture-adjustable automatic wire feeding mechanism (double-track guide rail) for a wire drawing clamp of a CNC electric spark wire cutting machine tool.

[0075] like Figure 1-Figure 11 As shown, the adjustable automatic wire feeding mechanism includes a wire drawing trolley 1, a guide rail and a trolley traction mechanism (see Figure 1-Figure 4 ).

[0076] For the convenience of description, the wire head position of the electrode wire 9 vertically passing through the wire guide hole 7 of the lower wire guide head 8 of the machine tool starts to go downward and go around the lower main guide wheel 29, and then the wire is horizontally passed to the position below the wire drum 10 as the lower wire feeding path of the machine tool (see Figure 1 and Figure 3 ). The wire feeding path is divided into the front section, middle section and rear section, and the wire head position is the front end position in the front section (see Figure 3 and Figure 4 The vertical position of the wire drawing trolley 1 at the middle right end), the position below the wire drum 10 is the rear end position in the rear section (see Figure 3 and Figure 4 The wire drawing trolley 1 position is in an inclined posture at the middle left end).

[0077] The wire drawing trolley 1 is a wire drawing device for clamping and placing the wire head of the electrode wire 9 and feeding the wire on the lower wire feeding path (see Figure 1-Figure 4 The wire drawing trolley 1 is provided with a normally closed wire clamp (not shown in the figure, which is arranged inside the front end of the wire drawing trolley 1), a first guide wheel 4 and a second guide wheel 15 (see Figure 5The body of the wire drawing trolley 1 has horizontal, vertical and inclined postures when working. When the body is in the horizontal posture, the front and rear direction of the body is defined as the X-axis direction, the left and right direction is the Y-axis direction, and the up and down direction is the Z-axis direction with the center of the body as the base point (see Figure 1-Figure 4 The X-axis, Y-axis and Z-axis coordinates are shown in the upper left corner).

[0078] The normally closed wire clamp is arranged at the front of the wire drawing trolley 1, and a wire head guide hole 27 (see Figure 5 ), the normally closed wire clamp is composed of a clamping mechanism for clamping the wire head of the electrode wire 9 and a spring for forcing the clamping mechanism to be in a normally closed state. In the assembled state, the spring acts on the clamping mechanism to make the clamping mechanism in a normally closed state, thereby forming a normally closed wire clamp. The normally closed wire clamp refers to a wire clamp that is always in a closed clamping state without external force intervention. Normally closed is relative to normally open. The wire clamp is a mechanism used to clamp the wire head of the electrode wire. A normally closed wire clamp can be directly formed by spring compression, or a normally closed wire clamp can be formed by a lever mechanism and a spring combination. A normally closed wire clamp can also be formed by a solenoid valve in a normally closed state, and so on. For example, in the present embodiment, the normally closed wire clamp formed by a lever mechanism and a spring combination is mainly composed of a lever and a spring. The lever is rotatably supported on the wire drawing trolley 1, one end of the lever serves as the clamping mouth of the wire clamp, and the spring acts on the other end of the lever to make the clamping mouth of the wire clamp in a normally closed state. This normally closed wire clamp is arranged on the wire drawing trolley 1 and belongs to a built-in normally closed wire clamp structure.

[0079] One of the first guide wheel 4 and the second guide wheel 15 is arranged on one side of the vehicle body, and the other is arranged on the other side of the vehicle body. The first guide wheel 4 and the second guide wheel 15 are on opposite sides of the vehicle body (see Figure 5 and Figure 6 The first guide wheel 4 is rotatably connected to the vehicle body through the first wheel axle 6, and the second guide wheel 15 is rotatably connected to the vehicle body through the second wheel axle 3. The axis of the first wheel axle 6 and the axis of the second wheel axle 3 are both parallel to the Y-axis direction (see Figure 5 and Figure 6 ), and when the vehicle body is in a horizontal posture, the projection of the axis of the first wheel shaft 6 and the axis of the second wheel shaft 3 in the X-axis direction is a distance apart, wherein the first guide wheel 4 is located at the front end position of the wire clamping trolley 1 (see Figure 5 ).

[0080] The guide track is a track used to guide and adjust the posture of the wire drawing trolley 1 on the lower wire feeding path. The guide track is composed of a double-track guide track consisting of a first guide track 24 and a second guide track 23 (see Figure 6 ), the first guide track 24 and the second guide track 23 are both composed of guide grooves (see Figure 6), wherein the first guide wheel 4 is guided in cooperation with the guide groove of the first guide rail 24, the two side surfaces of the guide groove of the first guide rail 24 are the guide surfaces of the first guide wheel 4, and the two side surfaces are parallel to each other and perpendicular to the XZ plane (see Figure 6 The second guide wheel 15 cooperates with the guide groove of the second guide track 23. The two side surfaces of the guide groove of the second guide track 23 are the guide surfaces of the second guide wheel 15, and the two side surfaces are parallel to each other and perpendicular to the XZ plane (see Figure 6 ). In fact, the first guide track 24 and the second guide track 23 can also be composed of guide plates. When the first guide track 24 is a guide plate, two first guide wheels 4 are used to clamp the guide plate for guiding cooperation. Similarly, when the second guide track 23 is a guide plate, the second guide wheel 15 is used to clamp the guide plate for guiding cooperation, and the two side surfaces of the guide plate serve as guide surfaces. This is understandable and acceptable to those skilled in the art.

[0081] The first guide rail 24 and the second guide rail 23 are respectively provided with a front rail, a middle rail and a rear rail corresponding to the front section, the middle section and the rear section of the lower wire feeding path, and the front rail, the middle rail and the rear rail are smoothly connected, wherein the head end position of the front rail corresponds to the front end position, and the tail end position of the rear rail corresponds to the rear end position. In order to ensure that the front end position of the wire drawing trolley 1 meets the needs of automatic wire threading, at least one of the front rail of the first guide rail 24 and the front rail of the second guide rail 23 is provided with a curved or bent posture adjustment section, and the guide surface of the posture adjustment section guides the wire drawing trolley 1 to bypass the lower main guide wheel 29 on the lower wire feeding path while changing its own posture (see Figure 4 ).

[0082] The trolley traction mechanism is a mechanism for pushing and pulling the wire drawing trolley 1 on the lower wire feeding path. The wire drawing trolley 1 has a traction end 5. The first guide rail 24 and the second guide rail 23 are used to constrain the movement direction, position and posture of the wire drawing trolley 1, and guide the wire drawing trolley 1 to move in a plane parallel to the XZ plane. The trolley traction mechanism drives the wire drawing trolley 1 to push forward or pull backward between the front end position and the rear end position through the traction end 5 (see Figure 3 and Figure 4 ).

[0083] In the working state, the wire drawing trolley 1 maintains a horizontal posture when it enters the front position from the middle section (see Figure 4), when the trolley traction mechanism drives the wire drawing trolley 1 to move to the front end position at the front section of the lower wire feeding path, on the one hand, the first guide wheel 4 on one side of the wire drawing trolley 1 is constrained by the front section of the first guide track 24, and on the other hand, the second guide wheel 15 on the other side of the wire drawing trolley 1 is constrained by the front section of the second guide track 23. Since the wire drawing trolley 1 is subject to dual constraints at the same time, the wire drawing trolley 1 gradually swings from a horizontal posture during the movement until it reaches the front end position and presents a vertical posture (see Figure 4 ), the wire drawing trolley 1 is located below the wire guide hole 7 of the lower wire guide head 8 in a vertical posture, and the wire head guide hole 27 provided at the front end of the wire drawing trolley 1 is directly opposite to the wire head of the electrode wire 9 that will vertically pass through the wire guide hole 7 (see Figure 4 ).

[0084] In this embodiment, the front track of the guide track includes the following variations: 1. The first variation of the front track is (see Figure 7 ): The front track of the first guide track 24 is the first front posture adjustment track 2 (see Figure 7 ), the projection track of the first front posture adjustment track 2 on the XZ plane is formed by smoothly connecting the first horizontal straight line segment, the second arc segment or the second inclined segment and the third vertical straight line segment in sequence (see Figure 7 ), wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X axis from the back to the front, the second arc segment or the second inclined segment is an arc segment or inclined segment guide groove or guide plate bent from the back to the top, and the third vertical straight line segment is a straight line segment guide groove or guide plate parallel to the Z axis from the bottom to the top (see Figure 7 ).

[0085] The front track of the second guide track 23 is the second front posture adjustment track 11 (see Figure 7 ), the trajectory of the second front posture adjustment track 11 is a straight line segment parallel to the X-axis, and the straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front.

[0086] from Figure 3 and Figure 4 It can be seen that the front track adopts Figure 7 The first variation of .

[0087] 2. The second variation of the front track is (see Figure 8 ): The front track of the first guide track 24 is the first front posture adjustment track 2 (see Figure 8 ), the projection track of the first front posture adjustment track 2 on the XZ plane is formed by smoothly connecting the first horizontal straight line segment and the second arc segment or the second inclined segment in sequence (see Figure 8), wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from the back to the front, and the second arc segment or the second inclined segment is a circular arc segment or inclined segment guide groove or guide plate curved from the back to the top (see Figure 8 ).

[0088] The front track of the second guide track 23 is the second front posture adjustment track 11 (see Figure 8 ), the trajectory of the second front posture adjustment track 11 is a straight line segment parallel to the X-axis, and the straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front.

[0089] 3. The third variation of the front track is (see Fig. 9 ): The front track of the first guide track 24 is the first front posture adjustment track 2 (see Fig. 9 ), the projection track of the first front posture adjustment track 2 on the XZ plane is formed by smoothly connecting the first horizontal straight line segment and the second arc segment or the second inclined segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X axis from the back to the front, and the second arc segment or the second inclined segment is a circular arc segment or inclined segment guide groove or guide plate curved from the back to the top (see Fig. 9 ).

[0090] The front track of the second guide track 23 is the second front posture adjustment track 11 (see Fig. 9 ), the projection track of the second front posture adjustment track 11 on the XZ plane is formed by smoothly connecting the first horizontal straight line segment and the second arc segment or the second inclined segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X axis from the back to the front, and the second arc segment or the second inclined segment is an arc segment or inclined segment guide groove or guide plate curved from the back to the top to the bottom (see Fig. 9 ).

[0091] 4. The fourth variation of the front track is (see Fig.10 ): The front track of the first guide track 24 is the first front posture adjustment track 2 (see Fig.10 ), the trajectory of the first front posture adjustment track 2 is a straight line segment parallel to the X-axis, and the straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front (see Fig.10 ).

[0092] The front track of the second guide track 23 is the second front posture adjustment track 11 (see Fig.10 ), the projection track of the second front posture adjustment track 11 in the XZ plane is formed by smoothly connecting the first horizontal straight line segment, the second arc segment or the second inclined segment and the third vertical straight line segment in sequence (see Fig.10), wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X axis from the back to the front, the second arc segment or the second inclined segment is an arc segment or inclined segment guide groove or guide plate bent from the back to the front and the bottom, and the third vertical straight line segment is a straight line segment guide groove or guide plate parallel to the Z axis from the top to the bottom (see Fig.10 ).

[0093] 5. The fifth variation of the front track is (see Fig.11 ): The front track of the first guide track 24 is the first front posture adjustment track 2 (see Fig.11 ), the trajectory of the first front posture adjustment track 2 is a straight line segment parallel to the X-axis, and the straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front (see Fig.11 ).

[0094] The front track of the second guide track 23 is the second front posture adjustment track 11 (see Fig.11 ), the projection track of the second front posture adjustment track 11 on the XZ plane is formed by smoothly connecting the first horizontal straight line segment and the second arc segment or the second inclined segment in sequence (see Fig.11 ), wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from the back to the front, and the second arc segment or the second inclined segment is a circular arc segment or inclined segment guide groove or guide plate curved from the back to the top to the bottom (see Fig.11 ).

[0095] In this embodiment, the rear track of the guide track is as follows: The rear section track of the first guide track 24 is the first rear posture adjustment track 12 (see Figure 4 ), the rear section track of the second guide track 23 is the second rear posture adjustment track 13 (see Figure 3 ), the first rear posture adjustment track 12 and the second rear posture adjustment track 13 are both provided with a lifting section that is bent upward or unbent, and the lifting sections of both are located below the wire drum 10 and are arranged circumferentially around the left side of the wire drum 10, and the guide surfaces of the lifting sections of both guide the clamping wire drawing trolley 1 to feed the electrode wire 9 into the wire clamp 14 of the wire drum 10 (see Figure 3 and Figure 4 ).

[0096] In the working state, when the wire drawing carriage 1 enters the rear section from the middle section, it maintains a horizontal posture (see Figure 3 and Figure 4 ), when the trolley traction mechanism pulls the wire drawing trolley 1 to move to the rear end position on the rear section of the lower wire feeding path, on the one hand, the first guide wheel 4 on one side of the wire drawing trolley 1 is constrained by the first rear adjustment track 12 of the first guide track 24 (see Figure 4), on the other hand, the second guide wheel 15 on the other side of the wire drawing trolley 1 is constrained by the second rear posture adjustment track 13 of the second guide track 23 (see Figure 3 ), since the wire drawing trolley 1 is subject to dual constraints at the same time, the wire drawing trolley 1 gradually swings from a horizontal posture under the action of the upward bending or bending lifting section, until it reaches the rear end position, the wire drawing trolley 1 is lifted for a distance in the Z-axis direction and presents an inclined posture with a downward tilt at the front. During the lifting and turning movement of the wire drawing trolley 1, the electrode wire 9 pulled backward is simultaneously fed into the wire clamp 14 of the wire drum 10 (see Figure 3 ), the pulled electrode wire 9 is tangent to the outer cylindrical surface of the wire tube 10.

[0097] In this embodiment, the rear track of the guide track includes the following variations: 1. The first variation of the rear track is (see Figure 3 and Figure 4 ): The projection tracks of the first rear posture adjustment track 12 and the second rear posture adjustment track 13 on the XZ plane are formed by smoothly connecting the first horizontal straight line segment, the second arc segment and the third inclined straight line segment in sequence from front to back (see Figure 3 and Figure 4 ), wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from front to back, the second arc segment is an arc segment guide groove or guide plate curved from the front lower to the rear upper, and the third inclined straight line segment is a straight line segment guide groove or guide plate inclined from the front lower to the rear upper.

[0098] 2. The second variation of the rear track is (not shown): The projection trajectories of the first rear attitude adjustment track 12 and the second rear attitude adjustment track 13 in the XZ plane are formed by smoothly connecting the first horizontal straight line segment and the second inclined straight line segment in sequence from front to back, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from front to back, and the second inclined straight line segment is a straight line segment guide groove or guide plate inclined from the front lower to the rear upper.

[0099] In this embodiment, the middle track of the guide track is as follows (see Figure 3 and Figure 4 ): The middle sections of the first guide track 24 and the second guide track 23 are both horizontal straight line segments parallel to the X-axis direction (see Figure 3 and Figure 4 ), in the working state, when the wire drawing trolley 1 enters the middle position, it maintains a horizontal posture.

[0100] In this embodiment, the trolley traction mechanism includes a chain 18, a sprocket 19 and a drive motor 20 (see Figure 1-Figure 3 ).

[0101] The chain 18 is an open-loop chain, that is, the head and tail of the chain 18 are not connected to form a chain link (see Figure 3 ), the chain 18 is a roller chain consisting of chain rollers 33 (see Figure 5 )、Chain roller shaft 34 (see Figure 5 ) and chain plates (not marked, but Figure 5 ) connection, wherein a chain roller 33 at the head end of the chain 18 serves as the second guide wheel 15 (see Figure 5 ), the chain roller shaft 34 corresponding to the second guide wheel 15 is used as the second wheel shaft 3 (see Figure 5 The second guide rail 23 serves as the chain guide rail 17 (see Figure 6 ), the chain guide rail 17 is fixedly laid between the front end position and the rear end position of the lower wire feeding path relative to the lower wire arm 28 of the machine tool, and the chain guide rail 17 has a T-shaped guide groove (see Figure 6 ). In the assembled state, the chain roller 33 and one side chain plate of the chain 18 are guided and matched with the T-shaped guide groove of the chain guide rail 17 and can slide as a whole along the direction of the T-shaped guide groove. The chain roller shaft 34 as the second wheel shaft 3 also serves as a push-pull traction point, which is rotatably connected to the traction end 5 of the wire drawing trolley 1 (see Figure 5 ).

[0102] The drive motor 20 and the sprocket 19 are positioned and installed on a relatively stationary component with respect to the lower line arm 28 of the machine tool. The drive motor 20 is connected to the sprocket 19 in a transmission manner, and the sprocket 19 is meshed with the chain 18 (see Figure 1 and Figure 2 ).

[0103] Thus, the chain guide rail 17, the open-loop chain 18, the sprocket 19 and the drive motor 20 cooperate to form a traction mechanism that can push forward or pull backward the wire drawing trolley 1 to move along the lower wire feeding path (see Figure 1 and Figure 2 ).

[0104] A circular arc chain guide 21 (see Figure 1 ), the radius of the arc-shaped chain guide 21 matches the radius of the sprocket 19, so that the chain 18 can go around the arc-shaped chain guide 21 and droop naturally under the action of its own gravity at the lower end outlet (see Figure 1 ).

[0105] A chain storage box 22 (see FIG. 22 ) is provided below the naturally drooping chain 18 for storing the chain 18. Figure 1), the horizontal cross-section of the box cavity of the chain storage box 22 is a rectangular cross-section, the width of the rectangular cross-section is adapted to the width of the chain 18, the length of the rectangular cross-section is at least greater than the length of one section of the chain, and the box cavity has a depth capable of storing the chain 18 in the natural sagging direction of the chain 18. When the chain 18 moves backward along the chain guide 17 and naturally droops from the lower end outlet of the arc-shaped chain guide 21, under the action of the gravity and self-flexibility of the chain 18 and the constraint of the chain storage box 22, a part of the naturally drooping section of the chain 18 is stacked in the chain storage box 22 (see Figure 1 ).

[0106] The trolley traction mechanism of the present invention is not limited to the combination structure of the chain 18, sprocket 19, drive motor 20 and chain guide 17, and can also adopt a belt and pulley drive mechanism, a rope and rope pulley drive mechanism, etc. In the automatic wire threading, as long as the traction end 5 can drive the wire drawing trolley 1 to move forward or backward between the front end position and the rear end position under the control of the automatic wire threading system of the machine tool, Figure 3 and Figure 4 ), can meet the use requirements. This is understandable and acceptable to those skilled in the art.

[0107] In this embodiment, the wire drawing trolley 1 is provided with a top pressure point for opening the clamping mechanism corresponding to the spring on the normally closed wire clamp, and a trolley wire clamp opening mechanism is provided corresponding to the top pressure point. The trolley wire clamp opening mechanism is a top pressure mechanism capable of opening the normally closed wire clamp on the wire drawing trolley 1, and the top pressure mechanism is composed of two sets of front-end top pressure mechanisms and rear-end top pressure mechanisms. The front-end top pressure mechanism is positioned and installed at the front-end position and is externally arranged relative to the top pressure point of the normally closed wire clamp of the wire drawing trolley 1, and the rear-end top pressure mechanism is positioned and installed at the rear-end position and is externally arranged relative to the top pressure point of the normally closed wire clamp of the wire drawing trolley 1. The front end pressing mechanism is provided with a front pressing output end controlled by the automatic wire threading system of the machine tool. In the working state, when the wire drawing trolley 1 runs to the front end position, the front pressing output end is extended under the control of the automatic wire threading system of the machine tool and acts on the pressing point of the normally closed wire clamp to overcome the spring force to open the clamping mechanism on the wire drawing trolley 1. When the wire head of the electrode wire 9 is fed into the clamping mechanism, the front pressing output end is retracted to close the clamping mechanism to complete the wire clamping. The rear end pressing mechanism is provided with a rear pressing output end controlled by the automatic wire threading system of the machine tool. In the working state, when the wire drawing trolley 1 runs to the rear end position and feeds the electrode wire 9 from the bottom of the wire drum 10 into the wire clamp 14 of the wire drum 10, the rear pressing output end is extended under the control of the automatic wire threading system of the machine tool and acts on the pressing point of the normally closed wire clamp to overcome the spring force to open the clamping mechanism on the wire drawing trolley 1 to complete the wire release.

[0108] The front end pressing mechanism is a front cylinder 31 (see Figure 2), the front cylinder 31 has a front extension end, which serves as the front pressure output end. The rear pressure mechanism is the rear cylinder 32 (see Figure 3 and Figure 4 ), the rear cylinder 32 has a rear extension end, which serves as a rear top pressure output end.

[0109] The front end pressing mechanism and the rear end pressing mechanism of the present invention are not limited to using a cylinder, and can also use an electromagnet, a cam mechanism, a lever mechanism or a crank connecting rod mechanism. This is understandable and acceptable to those skilled in the art.

[0110] In this embodiment, a front position travel switch (not shown in the figure) and a rear position travel switch (not shown in the figure) are correspondingly provided for the front position and the rear end position, and an induction contact or contact block (not shown in the figure) capable of measuring the walking position is provided on the body of the wire drawing trolley 1.

[0111] The front position travel switch is arranged corresponding to the front end position of the lower wire feeding path, and a front position contact is provided on the front position travel switch. The front position contact and the sensing contact of the wire drawing trolley 1 are in contact cooperation or non-contact cooperation working states on the path where the wire drawing trolley 1 runs along the lower wire feeding path.

[0112] The rear position travel switch is arranged corresponding to the rear end position of the lower wire feeding path, and a rear position contact is provided on the rear position travel switch. The rear position contact and the sensing contact of the wire drawing trolley 1 are in contact cooperation or non-contact cooperation working states on the path where the wire drawing trolley 1 runs along the lower wire feeding path.

[0113] In order to detect whether the wire head of the electrode wire 9 is inserted into place, a corresponding sensor or detection circuit (not shown in the figure) can be set. When the wire clamping and drawing trolley 1 is located at the front end position and presents a vertical posture, the sensor or detection circuit is used to detect whether the wire head is inserted into place. Thus, the signal of the electrode wire 9 entering the clamping mechanism of the wire clamping and drawing trolley 1 can be transmitted to the machine tool control system, so as to accurately judge whether the wire head of the electrode wire 9 enters the clamping mechanism of the wire clamping and drawing trolley 1, thereby improving the reliability and accuracy of automatic wire threading of the machine tool.

[0114] The working process of the posture-adjustable automatic wire feeding mechanism of the wire drawing clamp in the embodiment of the present invention is as follows: See also Figure 1-Figure 4 As shown, 1. The driving motor 20 drives the chain 18 to move from right to left along the chain guide 17 through the sprocket 19, and the chain 18 drives the wire drawing trolley 1 to move from right to left through the traction end 5, and the wire drawing trolley 1 moves forward to below the lower main guide wheel 29 of the lower wire guide head 8; 2. The wire drawing trolley 1 gradually swings from a horizontal position until it reaches the front end position and assumes a vertical position (see Figure 4), at this time, the front travel switch sends out a signal that the wire drawing trolley 1 is in place; 3. Front cylinder 31 (see Figure 2 ) extends the front end of the wire drawing trolley 1, presses the pressing point on the normally closed wire clamp, and opens the clamping mechanism (wire clamp) of the wire drawing trolley 1; 4. The wire feeding mechanism of the machine tool feeds the wire head of the electrode wire 9 into the clamping mechanism (wire clamp) of the wire drawing trolley 1 through the lower wire guide nozzle 26 on the upper part of the lower wire guide head 8; 5. The machine tool detects the in-position signal that the wire head enters the clamping mechanism of the wire drawing trolley 1, the front extension end of the front cylinder 31 retracts, and the spring locks the clamping mechanism of the wire drawing trolley 1 to clamp the electrode wire 9; 6. The driving motor 20 drives the sprocket 19, the chain 18, and the wire-drawing trolley 1 to be pulled back to the bottom of the wire drum 10. Under the action of the upwardly bent or folded lifting section, the wire-drawing trolley 1 gradually swings from a horizontal posture until it reaches the rear end position. The wire-drawing trolley 1 is lifted for a distance in the Z-axis direction and presents an inclined posture with a downward tilt at the front. During the lifting and rotating movement of the wire-drawing trolley 1, the electrode wire 9 pulled backward is simultaneously fed into the wire clamp 14 of the wire drum 10 (see Figure 3 ), at this time, the wire clamp 14 of the wire drum 10 is in an open state; 7. Under the control of the automatic wire threading system of the machine tool, the wire clamp 14 of the wire drum 10 is locked through the corresponding operating mechanism; 8. The clamping mechanism of the wire drawing trolley 1 is opened, releasing the wire head of the electrode wire 9, and the entire process of automatic lower clamping and wire drawing is completed.

[0115] Embodiment 2: A posture-adjustable automatic wire feeding mechanism (single-rail guide track) for a wire drawing clamp of a CNC wire-cut electric discharge machine.

[0116] The adjustable automatic wire feeding mechanism comprises a wire drawing trolley 1, a guide rail and a trolley traction mechanism (refer to Figure 1-Figure 4 ).

[0117] The substantial difference between Example 2 and Example 1 is that the guide track of Example 2 adopts a single-track guide track (see Fig.12 ), while the guide track of Example 1 adopts a double-track guide track, and the rest of the contents are the same.

[0118] The following is a description of Example 2: For the convenience of description, the wire head position of the electrode wire 9 vertically passing through the wire guide hole 7 of the lower wire guide head 8 of the machine tool starts to go downward and go around the lower main guide wheel 29, and then the wire is horizontally passed to the position below the wire drum 10 as the lower wire feeding path of the machine tool (see Figure 1 and Figure 3 ), the lower wire feeding path is divided into the front section, the middle section and the rear section, and the wire head position is the front end position in the front section (see Figure 3 and Figure 4The vertical position of the wire drawing trolley 1 at the middle right end), the position below the wire drum 10 is the rear end position in the rear section (see Figure 3 and Figure 4 The wire drawing trolley 1 position is in an inclined posture at the middle left end).

[0119] The wire drawing trolley 1 is a wire drawing device for clamping and placing the wire head of the electrode wire 9 and feeding the wire on the lower wire feeding path (see Figure 1-Figure 4 The wire drawing trolley 1 is provided with a normally closed wire clamp (not shown in the figure, which is arranged inside the front end of the wire drawing trolley 1), a first guide wheel 4 and a second guide wheel 15 (see Fig.12 The body of the wire drawing trolley 1 has horizontal, vertical and inclined postures when working. When the body is in the horizontal posture, the front and rear direction of the body is defined as the X-axis direction, the left and right direction is the Y-axis direction, and the up and down direction is the Z-axis direction with the center of the body as the base point (see Figure 1-Figure 4 The X-axis, Y-axis and Z-axis coordinates are shown in the upper left corner).

[0120] The normally closed wire clamp is arranged at the front of the wire drawing trolley 1, and a wire head guide hole 27 (see Fig.12 ), the normally closed wire clamp is composed of a clamping mechanism for clamping the wire head of the electrode wire 9 and a spring for forcing the clamping mechanism to be in a normally closed state. In the assembled state, the spring acts on the clamping mechanism to make the clamping mechanism in a normally closed state, thereby forming a normally closed wire clamp. The normally closed wire clamp refers to a wire clamp that is always in a closed clamping state without external force intervention. Normally closed is relative to normally open. The wire clamp is a mechanism used to clamp the wire head of the electrode wire. A normally closed wire clamp can be directly formed by spring compression, or a normally closed wire clamp can be formed by a lever mechanism and a spring combination. A normally closed wire clamp can also be formed by a solenoid valve in a normally closed state, and so on. For example, in the present embodiment, the normally closed wire clamp formed by a lever mechanism and a spring combination is mainly composed of a lever and a spring. The lever is rotatably supported on the wire drawing trolley 1, one end of the lever serves as the clamping mouth of the wire clamp, and the spring acts on the other end of the lever to make the clamping mouth of the wire clamp in a normally closed state. This normally closed wire clamp is arranged on the wire drawing trolley 1 and belongs to a built-in normally closed wire clamp structure.

[0121] The first guide wheel 4 and the second guide wheel 15 are arranged on the same side of the vehicle body (see Fig.12 The first guide wheel 4 is rotatably connected to the vehicle body through the first wheel axle 6, and the second guide wheel 15 is rotatably connected to the vehicle body through the second wheel axle 3. The axis of the first wheel axle 6 and the axis of the second wheel axle 3 are both parallel to the Y-axis direction, and when the vehicle body is in a horizontal posture, the projections of the axis of the first wheel axle 6 and the axis of the second wheel axle 3 in the X-axis direction are a distance apart, wherein the first guide wheel 4 is located at the front end position of the wire drawing trolley 1 for clamping the wire (see Fig.12 ).

[0122] The guide track is a track used to guide and adjust the posture of the wire drawing trolley 1 on the lower wire feeding path. The guide track is composed of a single-track guide track, which is composed of a guide groove or a guide plate. The first guide wheel 4 and the second guide wheel 15 are simultaneously guided and matched with the guide groove or the guide plate of the single-track guide track (see Fig.12 ), the two side surfaces of the guide groove or guide plate of the monorail guide track serve as guide surfaces of the first guide wheel 4 and the second guide wheel 15 at the same time, and the two side surfaces are parallel to each other and perpendicular to the XZ plane.

[0123] The monorail guide track is provided with a front track, a middle track and a rear track corresponding to the front section, the middle section and the rear section of the lower wire feeding path, respectively. The front track, the middle track and the rear track are smoothly connected, wherein the head end position of the front track corresponds to the front end position, and the tail end position of the rear track corresponds to the rear end position. A curved or bent posture adjustment section is provided on the front track of the monorail guide track, and the guide surface of the posture adjustment section guides the wire drawing trolley 1 to bypass the lower main guide wheel 29 on the lower wire feeding path while changing its own posture.

[0124] The trolley traction mechanism is a mechanism used to push and pull the wire-drawing trolley 1 on the lower wire feeding path. The wire-drawing trolley 1 has a traction end 5. The monorail guide track is used to constrain the movement direction and position of the wire-drawing trolley 1 and guide the wire-drawing trolley 1 to move in a plane parallel to the XZ plane. The trolley traction mechanism drives the wire-drawing trolley 1 to push forward or pull backward between the front end position and the rear end position through the traction end 5. Under working condition, when the wire drawing trolley 1 enters the front position from the middle section, it maintains a horizontal posture. When the trolley traction mechanism drives the wire drawing trolley 1 to move to the front end position in the front section of the lower wire feeding path, the first guide wheel 4 and the second guide wheel 15 of the wire drawing trolley 1 are simultaneously constrained by the front section track of the monorail guide track. The wire drawing trolley 1 gradually swings from a horizontal posture during the movement until it reaches the front position and presents a vertical posture. In the vertical posture, the wire drawing trolley 1 is located below the wire guide hole 7 of the lower wire guide head 8, and the wire head guide hole 27 at the front end of the wire drawing trolley 1 is opposite to the wire head of the electrode wire 9 that is about to pass vertically through the wire guide hole 7.

[0125] In this embodiment, the front track of the monorail guide track includes the following two variations: 1. The first variation of the front track is (not shown): The front section of the monorail guide track is a chain guide track 17, and the projection trajectory of the chain guide track 17 in the XZ plane is formed by smoothly connecting a first horizontal straight line segment, a second arc segment or a second inclined segment and a third vertical straight line segment in sequence (not shown in the figure), wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front, the second arc segment or the second inclined segment is an arc segment or an inclined segment guide groove or guide plate curved from the rear lower part to the front upper part, and the third vertical straight line segment is a straight line segment guide groove or guide plate parallel to the Z-axis from bottom to top.

[0126] 2. The second variation of the front track is (not shown): The front section of the monorail guide track is a chain guide track 17, and the projection trajectory of the chain guide track 17 in the XZ plane is formed by smoothly connecting a first horizontal straight line segment and a second arc segment or a second inclined segment in sequence (not shown in the figure), wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front, and the second arc segment or the second inclined segment is a circular arc segment or inclined segment guide groove or guide plate curved from the rear lower part to the front upper part.

[0127] In this embodiment, the trolley traction mechanism includes a chain 18, a sprocket 19 and a drive motor 20 (refer to Figure 1-Figure 3 ).

[0128] The chain 18 is an open-loop chain, that is, the head and tail of the chain 18 are not connected to form a chain link (refer to Figure 3 ), the chain 18 is a roller chain consisting of chain rollers 33 (see Fig.12 )、Chain roller shaft 34 (see Fig.12 ) and chain plates (not marked, but Fig.12 ) connection, wherein a chain roller 33 at the head end of the chain 18 serves as the second guide wheel 15, and a chain roller shaft 34 corresponding to the second guide wheel 15 serves as the second wheel shaft 3 (see Fig.12 The first guide wheel 4 alone adopts a chain roller 33 independent of the chain 18, and the first wheel shaft 6 alone adopts a chain roller shaft 34 independent of the chain 18 (see Fig.12 The monorail guide rail is used as a chain guide rail 17, which is fixedly laid between the front end and the rear end of the lower wire feeding path relative to the lower wire arm 28 of the machine tool. The chain guide rail 17 has a T-shaped guide groove that accommodates each chain roller 33 and a side chain plate on the chain 18 and can perform guiding cooperation (refer to Figure 6In the assembled state, the chain 18 and the chain roller 33 independent of the chain 18 and the chain plate on one side are guided and matched with the T-shaped guide groove of the chain guide rail 17 and can slide as a whole along the direction of the T-shaped guide groove. The chain roller shaft 34 as the second wheel shaft 3 also serves as a push-pull traction point, which is rotatably connected to the traction end 5 of the wire drawing trolley 1.

[0129] The drive motor 20 and the sprocket 19 are positioned and installed on a relatively stationary component of the machine tool lower line arm 28. The drive motor 20 is connected to the sprocket 19 in a transmission manner, and the sprocket 19 is meshed with the chain 18 (refer to Figure 1 and Figure 2 ).

[0130] Thus, the chain guide rail 17, the open-loop chain 18, the sprocket 19 and the drive motor 20 cooperate to form a traction mechanism that can push forward or pull backward the wire drawing trolley 1 to move along the lower wire feeding path (refer to Figure 1 and Figure 2 ).

[0131] A chain storage box 22 (see FIG. 2 ) capable of storing the chain 18 is provided below the naturally drooping chain 18. Figure 1 ), the horizontal cross-section of the box cavity of the chain storage box 22 is a rectangular cross-section, the width of the rectangular cross-section is adapted to the width of the chain 18, the length of the rectangular cross-section is at least greater than the length of one section of the chain, and the box cavity has a depth capable of storing the chain 18 in the natural sagging direction of the chain 18. When the chain 18 moves backward along the chain guide 17 and naturally droops from the lower end outlet of the arc-shaped chain guide 21, under the action of the gravity and self-flexibility of the chain 18 and the constraint of the chain storage box 22, a part of the naturally drooping section of the chain 18 is stacked in the chain storage box 22 (reference Figure 1 ).

[0132] The trolley traction mechanism of the present invention is not limited to the combination structure of the chain 18, sprocket 19, drive motor 20 and chain guide 17, and can also adopt a belt and pulley drive mechanism, a rope and rope pulley drive mechanism, etc. In the automatic wire threading, as long as the traction end 5 can drive the wire drawing trolley 1 to move forward or backward between the front end position and the rear end position under the control of the automatic wire threading system of the machine tool, Figure 3 and Figure 4 ), can meet the use requirements. This is understandable and acceptable to those skilled in the art.

[0133] 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-cutting machine tool wire drawing device with adjustable posture and automatic wire feeding mechanism, characterized in that: It comprises a wire drawing trolley (1), a guide rail and a trolley traction mechanism; The wire head position of the electrode wire (9) vertically passing through the wire guide hole (7) of the lower wire guide head (8) of the machine tool starts to move downward and go around the lower main guide wheel (29), and then is horizontally passed to the position below the wire drum (10) as the lower wire feeding path of the machine tool. The lower wire feeding path is divided into a front section, a middle section and a rear section. The wire head position is the front end position in the front section, and the position below the wire drum (10) is the rear end position in the rear section. The wire drawing trolley (1) is a wire drawing device used for clamping and placing the wire head of the electrode wire (9) and feeding the wire on the lower wire feeding path. The body of the wire drawing trolley (1) is provided with a normally closed wire clamp, a first guide wheel (4) and a second guide wheel (15). The body of the wire drawing trolley (1) is defined to have a horizontal posture, a vertical posture and an inclined posture when working. When the body is in a horizontal posture, the front and rear direction of the body is defined as the X-axis direction, the left and right direction is the Y-axis direction, and the up and down direction is the Z-axis direction with the center of the body as the base point. The normally closed wire clamp is arranged at the front of the wire drawing trolley (1), and a wire head guide hole (27) is arranged at the front of the normally closed wire clamp. The normally closed wire clamp is composed of a clamping mechanism for clamping the wire head of the electrode wire (9) and a spring for forcing the clamping mechanism to be in a normally closed state. In the assembled state, the spring acts on the clamping mechanism to make the clamping mechanism in a normally closed state, thereby forming a normally closed wire clamp; One of the first guide wheel (4) and the second guide wheel (15) is arranged on one side of the vehicle body, and the other is arranged on the other side of the vehicle body, and the first guide wheel (4) and the second guide wheel (15) are on opposite sides of the vehicle body; the first guide wheel (4) is rotatably connected to the vehicle body via a first wheel axle (6), and the second guide wheel (15) is rotatably connected to the vehicle body via a second wheel axle (3), the axis of the first wheel axle (6) and the axis of the second wheel axle (3) are both parallel to the Y-axis direction, and when the vehicle body is in a horizontal posture, the projections of the axis of the first wheel axle (6) and the axis of the second wheel axle (3) in the X-axis direction are a distance apart, wherein the first guide wheel (4) is located at the front end of the wire drawing trolley (1) for clamping the wire; The guide track is a track used to guide and adjust the posture of the wire drawing trolley (1) on the lower wire feeding path, and the guide track is composed of a double-track guide track consisting of a first guide track (24) and a second guide track (23), and the first guide track (24) and the second guide track (23) are both composed of guide grooves or guide plates, wherein the first guide wheel (4) is guided and matched with the guide groove or guide plate of the first guide track (24), and the two side surfaces of the guide groove or guide plate of the first guide track (24) are guide surfaces of the first guide wheel (4), and the two side surfaces are parallel to each other and perpendicular to the XZ plane; the second guide wheel (15) is guided and matched with the guide groove or guide plate of the second guide track (23), and the two side surfaces of the guide groove or guide plate of the second guide track (23) are guide surfaces of the second guide wheel (15), and the two side surfaces are parallel to each other and perpendicular to the XZ plane; The first guide rail (24) and the second guide rail (23) are respectively provided with a front rail, a middle rail and a rear rail corresponding to the front section, the middle section and the rear section of the lower wire feeding path, and the front rail, the middle rail and the rear rail are smoothly connected, wherein the head end position of the front rail corresponds to the front end position, and the tail end position of the rear rail corresponds to the rear end position; at least one of the front rail of the first guide rail (24) and the front rail of the second guide rail (23) is provided with a curved or bent posture adjustment section, and the guide surface of the posture adjustment section guides the wire drawing trolley (1) to bypass the lower main guide wheel (29) on the lower wire feeding path while changing its own posture; The trolley traction mechanism is a mechanism for pushing and pulling the wire drawing trolley (1) on the lower wire feeding path. The wire drawing trolley (1) has a traction end (5). The first guide rail (24) and the second guide rail (23) are used to constrain the movement direction, position and posture of the wire drawing trolley (1) and guide the wire drawing trolley (1) to move in a plane parallel to the XZ plane. The trolley traction mechanism drives the wire drawing trolley (1) to move forward or backward between the front end position and the rear end position through the traction end (5). In the working state, the wire drawing trolley (1) maintains a horizontal posture when entering the front position from the middle section. When the trolley traction mechanism drives the wire drawing trolley (1) to move from the front section of the lower wire feeding path to the front position, on the one hand, the first guide wheel (4) on one side of the wire drawing trolley (1) is constrained by the front track of the first guide track (24), and on the other hand, the second guide wheel (15) on the other side of the wire drawing trolley (1) is constrained by the front track of the second guide track (23). Since the wire drawing trolley (1) is subject to dual constraints at the same time, the wire drawing trolley (1) gradually swings from a horizontal posture during the movement until it reaches the front position and presents a vertical posture. In the vertical posture, the wire drawing trolley (1) is located below the wire guide hole (7) of the lower wire guide head (8), and the wire head guide hole (27) provided at the front end of the wire drawing trolley (1) is directly opposite to the wire head of the electrode wire (9) that is to vertically pass through the wire guide hole (7).

2. The adjustable posture automatic wire feeding mechanism for wire drawing clamp according to claim 1 is characterized in that: The front track of the first guide track (24) is a first front posture adjustment track (2), and the projection track of the first front posture adjustment track (2) on the XZ plane is formed by smoothly connecting a first horizontal straight line segment, a second arc segment or a second inclined segment, and a third vertical straight line segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or a guide plate that is parallel to the X-axis from back to front, the second arc segment or the second inclined segment is an arc segment or an inclined segment guide groove or a guide plate that is bent from the rear lower part to the front upper part, and the third vertical straight line segment is a straight line segment guide groove or a guide plate that is parallel to the Z-axis from bottom to top; The front track of the second guide track (23) is a second front posture adjustment track (11), the trajectory of the second front posture adjustment track (11) is a straight line segment parallel to the X-axis, and the straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front.

3. The posture-adjustable automatic wire feeding mechanism for the wire clamp and wire drawing device according to claim 1 is characterized in that: The front track of the first guide track (24) is a first front posture adjustment track (2), and the projection track of the first front posture adjustment track (2) on the XZ plane is formed by smoothly connecting a first horizontal straight line segment and a second arc segment or a second inclined segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front, and the second arc segment or the second inclined segment is a circular arc segment or an inclined segment guide groove or guide plate curved from the rear lower part to the front upper part; The front track of the second guide track (23) is a second front posture adjustment track (11), the trajectory of the second front posture adjustment track (11) is a straight line segment parallel to the X-axis, and the straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front.

4. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 1 is characterized in that: The front track of the first guide track (24) is a first front posture adjustment track (2), and the projection track of the first front posture adjustment track (2) on the XZ plane is formed by smoothly connecting a first horizontal straight line segment and a second arc segment or a second inclined segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from back to front, and the second arc segment or the second inclined segment is a circular arc segment or an inclined segment guide groove or guide plate curved from the rear lower part to the front upper part; The front track of the second guide track (23) is a second front posture adjustment track (11), and the projection track of the second front posture adjustment track (11) on the XZ plane is formed by smoothly connecting a first horizontal straight line segment and a second arc segment or a second inclined segment in sequence, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from the back to the front, and the second arc segment or the second inclined segment is an arc segment or an inclined segment guide groove or guide plate that bends from the upper back to the lower front.

5. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 1 is characterized in that: The rear section of the first guide track (24) is the first rear posture adjustment track (12), and the rear section of the second guide track (23) is the second rear posture adjustment track (13). Both the first rear posture adjustment track (12) and the second rear posture adjustment track (13) are provided with a lifting section that is bent upward or unbent. Both lifting sections are located below the wire drum (10) and are arranged circumferentially around the wire drum (10). The guide surfaces of both lifting sections guide the wire drawing trolley (1) to feed the electrode wire (9) into the wire clamp (14) of the wire drum (10). In the working state, when the wire drawing trolley (1) moves from the middle section to the rear section, it maintains a horizontal posture. When the trolley traction mechanism pulls the wire drawing trolley (1) to move to the rear end position on the rear section of the lower wire feeding path, on the one hand, the first guide wheel (4) on one side of the wire drawing trolley (1) is constrained by the first rear posture adjustment track (12) of the first guide track (24), and on the other hand, the second guide wheel (15) on the other side of the wire drawing trolley (1) is constrained by the second rear posture adjustment track (13) of the second guide track (23). Since the wire drawing trolley (1) is subject to dual constraints at the same time, the wire drawing trolley (1) gradually swings from a horizontal posture under the action of the upwardly bent or folded lifting section until it reaches the rear end position. The wire drawing trolley (1) is lifted for a distance in the Z-axis direction and presents an inclined posture with the front part tilted downward. During the lifting and turning movement of the wire drawing trolley (1), the electrode wire (9) being pulled backward is simultaneously fed into the wire clamp (14) of the wire drum (10), and the pulled electrode wire (9) is tangent to the outer cylindrical surface of the wire drum (10).

6. The posture-adjustable automatic wire feeding mechanism for the wire clamp and drawer according to claim 5 is characterized by: The projection tracks of the first rear posture adjustment track (12) and the second rear posture adjustment track (13) on the XZ plane are formed by smoothly connecting a first horizontal straight line segment, a second arc segment and a third inclined straight line segment in sequence from front to back, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from front to back, the second arc segment is an arc segment guide groove or guide plate curved from the front lower to the rear upper, and the third inclined straight line segment is a straight line segment guide groove or guide plate inclined from the front lower to the rear upper.

7. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 5 is characterized by: The projection tracks of the first rear posture adjustment track (12) and the second rear posture adjustment track (13) on the XZ plane are formed by smoothly connecting a first horizontal straight line segment and a second inclined straight line segment in sequence from front to back, wherein the first horizontal straight line segment is a straight line segment guide groove or guide plate parallel to the X-axis from front to back, and the second inclined straight line segment is a straight line segment guide groove or guide plate inclined from the front lower to the rear upper.

8. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 1 is characterized by: The middle sections of the first guide track (24) and the second guide track (23) are both horizontal straight sections parallel to the X-axis direction. In the working state, when the wire drawing trolley (1) enters the middle section position, it maintains a horizontal posture.

9. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawer according to claim 1 is characterized by: The trolley traction mechanism comprises a chain (18), a sprocket (19) and a drive motor (20); The chain (18) is an open-loop chain, i.e., the head and tail of the chain (18) are not connected to form a chain link. The chain (18) is a roller chain composed of a chain roller (33), a chain roller shaft (34) and a chain plate, wherein a chain roller (33) at the head end of the chain (18) serves as a second guide wheel (15), and a chain roller shaft (34) corresponding to the second guide wheel (15) serves as a second wheel shaft (3); the second guide rail (23) serves as a chain guide rail (17), and the chain guide rail (17) is fixedly laid on the lower wire feeding path relative to the lower wire arm (28) of the machine tool. The chain guide rail (17) has a T-shaped guide groove for accommodating each chain roller (33) and a side chain plate on the chain (18) and capable of guiding and matching; in an assembled state, the chain roller (33) and the side chain plate of the chain (18) are guided and matched with the T-shaped guide groove of the chain guide rail (17) and can slide as a whole along the direction of the T-shaped guide groove, and the chain roller shaft (34) serving as the second wheel shaft (3) also serves as a push-pull traction point, and the push-pull traction point is rotatably connected to the traction end (5) of the wire drawing trolley (1); The drive motor (20) and the sprocket (19) are positioned and mounted on a relatively stationary component with respect to the machine tool lower line arm (28), the drive motor (20) is transmission-connected to the sprocket (19), and the sprocket (19) is meshed with the chain (18); Thus, a chain guide rail (17), an open-loop chain (18), a sprocket (19) and a drive motor (20) cooperate to form a traction mechanism capable of pushing the wire drawing trolley (1) forward or pulling it backward to move along the lower wire feeding path.

10. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 9, characterized in that: An arc-shaped chain guide rail (21) is provided in the meshing section between the chain (18) and the sprocket (19), and the radius of the arc-shaped chain guide rail (21) matches the radius of the sprocket (19), so that the chain (18) can go around along the arc-shaped chain guide rail (21) and naturally droop at the lower end outlet under the action of its own gravity.

11. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 10 is characterized in that: A chain storage box (22) capable of storing the chain (18) is provided below the naturally drooping chain (18); the horizontal cross-section of the box cavity of the chain storage box (22) is a rectangular cross-section; the width of the rectangular cross-section matches the width of the chain (18); the length of the rectangular cross-section is at least greater than the length of one section of the chain; the box cavity has a depth capable of storing the chain (18) in the naturally drooping direction of the chain (18); when the chain (18) moves backward along the chain guide rail (17) and droops naturally from the lower end outlet of the arc-shaped chain guide rail (21), under the action of the gravity and self-flexibility of the chain (18) and the constraint of the chain storage box (22), a part of the naturally drooping section of the chain (18) is stacked in the chain storage box (22).

12. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 1 is characterized in that: The trolley traction mechanism adopts a belt and pulley driving mechanism, a rope and rope pulley driving mechanism.

13. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 1 is characterized in that: The wire drawing trolley (1) is provided with a pressing point for opening the clamping mechanism corresponding to the spring on the normally closed wire clamp, and a trolley wire clamp opening mechanism is provided corresponding to the pressing point. The trolley wire clamp opening mechanism is a pressing mechanism capable of opening the normally closed wire clamp on the wire drawing trolley (1), and the pressing mechanism is composed of a front pressing mechanism and a rear pressing mechanism. The front pressing mechanism is positioned and installed at the front position and is externally arranged relative to the pressing point of the normally closed wire clamp of the wire drawing trolley (1), and the rear pressing mechanism is positioned and installed at the rear position and is externally arranged relative to the pressing point of the normally closed wire clamp of the wire drawing trolley (1); the front pressing mechanism is provided with a front pressing output end controlled by the automatic wire threading system of the machine tool, and in the working state, when the wire drawing trolley (1) runs to the front position, The front pressing output end is extended under the control of the automatic wire threading system of the machine tool and acts on the pressing point of the normally closed wire clamp to overcome the spring force so that the clamping mechanism on the wire clamping trolley (1) is opened. When the wire head of the electrode wire (9) is fed into the clamping mechanism, the front pressing output end is retracted to close the clamping mechanism to complete the wire clamping. The rear end pressing mechanism is provided with a rear pressing output end controlled by the automatic wire threading system of the machine tool. In the working state, when the wire clamping trolley (1) runs to the rear end position and feeds the electrode wire (9) from the bottom of the wire drum (10) into the wire clamp (14) of the wire drum (10), the rear pressing output end is extended under the control of the automatic wire threading system of the machine tool and acts on the pressing point of the normally closed wire clamp to overcome the spring force so that the clamping mechanism on the wire clamping trolley (1) is opened to complete the wire feeding.

14. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 13, characterized in that: The front-end pressing mechanism is a front cylinder (31), which has a front extension end, and the front extension end serves as a front pressing output end; the rear-end pressing mechanism is a rear cylinder (32), which has a rear extension end, and the rear extension end serves as a rear pressing output end.

15. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawer according to claim 13, characterized in that: The front end pressing mechanism and the rear end pressing mechanism both adopt electromagnet, cam mechanism, lever mechanism or crank connecting rod mechanism.

16. A CNC wire-cutting machine tool wire drawing device with adjustable posture and automatic wire feeding mechanism, characterized in that: It comprises a wire drawing trolley (1), a guide rail and a trolley traction mechanism; The wire head position of the electrode wire (9) vertically passing through the wire guide hole (7) of the lower wire guide head (8) of the machine tool starts to move downward and go around the lower main guide wheel (29), and then is horizontally passed to the position below the wire drum (10) as the lower wire feeding path of the machine tool. The lower wire feeding path is divided into a front section, a middle section and a rear section. The wire head position is the front end position in the front section, and the position below the wire drum (10) is the rear end position in the rear section. The wire drawing trolley (1) is a wire drawing device used for clamping and placing the wire head of the electrode wire (9) and feeding the wire on the lower wire feeding path. The body of the wire drawing trolley (1) is provided with a normally closed wire clamp, a first guide wheel (4) and a second guide wheel (15). The body of the wire drawing trolley (1) is defined to have a horizontal posture, a vertical posture and an inclined posture when working. When the body is in a horizontal posture, the front and rear direction of the body is defined as the X-axis direction, the left and right direction is the Y-axis direction, and the up and down direction is the Z-axis direction with the center of the body as the base point. The normally closed wire clamp is arranged at the front of the wire drawing trolley (1), and a wire head guide hole (27) is arranged at the front of the normally closed wire clamp. The normally closed wire clamp is composed of a clamping mechanism for clamping the wire head of the electrode wire (9) and a spring for forcing the clamping mechanism to be in a normally closed state. In the assembled state, the spring acts on the clamping mechanism to make the clamping mechanism in a normally closed state, thereby forming a normally closed wire clamp; The first guide wheel (4) and the second guide wheel (15) are arranged on the same side of the vehicle body; the first guide wheel (4) is rotatably connected to the vehicle body via a first wheel axle (6), and the second guide wheel (15) is rotatably connected to the vehicle body via a second wheel axle (3); the axis of the first wheel axle (6) and the axis of the second wheel axle (3) are both parallel to the Y-axis direction, and when the vehicle body is in a horizontal posture, the projections of the axis of the first wheel axle (6) and the axis of the second wheel axle (3) in the X-axis direction are a certain distance apart, wherein the first guide wheel (4) is located at the front end of the wire drawing trolley (1) for clamping wire; The guide track is a track used to guide and adjust the posture of the wire drawing trolley (1) on the lower wire feeding path, and the guide track is composed of a single-rail guide track, and the single-rail guide track is composed of a guide groove or a guide plate. The first guide wheel (4) and the second guide wheel (15) are simultaneously guided and matched with the guide groove or the guide plate of the single-rail guide track, and the two side surfaces of the guide groove or the guide plate of the single-rail guide track simultaneously serve as guide surfaces of the first guide wheel (4) and the second guide wheel (15), and the two side surfaces are parallel to each other and perpendicular to the XZ plane; The monorail guide track is provided with a front track, a middle track and a rear track respectively corresponding to the front section, the middle section and the rear section of the lower wire feeding path, and the front track, the middle track and the rear track are smoothly connected, wherein the head end position of the front track corresponds to the front end position, and the tail end position of the rear track corresponds to the rear end position; a curved or bent posture adjustment section is provided on the front track of the monorail guide track, and the guide surface of the posture adjustment section guides the wire drawing trolley (1) to bypass the lower main guide wheel (29) on the lower wire feeding path while changing its own posture; The trolley traction mechanism is a mechanism for pushing and pulling the wire drawing trolley (1) on the lower wire feeding path. The wire drawing trolley (1) has a traction end (5). The single-rail guide track is used to constrain the movement direction and position of the wire drawing trolley (1) and guide the wire drawing trolley (1) to move in a plane parallel to the XZ plane. The trolley traction mechanism drives the wire drawing trolley (1) to move forward or backward between the front end position and the rear end position through the traction end (5). In the working state, when the wire drawing trolley (1) enters the front position from the middle section, it maintains a horizontal posture. When the trolley traction mechanism drives the wire drawing trolley (1) to move from the front section of the lower wire feeding path to the front position, the first guide wheel (4) and the second guide wheel (15) of the wire drawing trolley (1) are simultaneously constrained by the front section track of the monorail guide track. The wire drawing trolley (1) gradually swings from a horizontal posture during the movement until it reaches the front position and presents a vertical posture. In the vertical posture, the wire drawing trolley (1) is located below the wire guide hole (7) of the lower wire guide head (8), and the wire head guide hole (27) at the front end of the wire drawing trolley (1) faces the wire head of the electrode wire (9) that is to vertically pass through the wire guide hole (7).

17. The posture-adjustable automatic wire feeding mechanism for a wire clamp and drawbar according to claim 16, characterized in that: The trolley traction mechanism comprises a chain (18), a sprocket (19) and a drive motor (20); The chain (18) is an open-loop chain, i.e., the head and tail of the chain (18) are not connected to form a chain link. The chain (18) is a roller chain composed of a chain roller (33), a chain roller shaft (34) and a chain plate, wherein a chain roller (33) at the head end of the chain (18) serves as a second guide wheel (15), and a chain roller shaft (34) corresponding to the second guide wheel (15) serves as a second wheel shaft (3); the first guide wheel (4) uses a chain roller (33) that is independent of the chain (18), and the first wheel shaft (6) uses a chain roller shaft (34) that is independent of the chain (18); the monorail guide track serves as a chain guide rail (17), and the chain guide rail (17) is fixedly laid between the front end position and the rear end position of the lower wire feeding path relative to the machine tool lower wire arm (28), and the chain guide rail (17) has a T-shaped guide groove that accommodates each chain roller (33) and a side chain plate on the chain (18) and can be guided and matched; in the assembled state, the chain (18) and the chain roller (33) independent of the chain (18) and the side chain plate are guided and matched with the T-shaped guide groove of the chain guide rail (17) and can slide as a whole along the direction of the T-shaped guide groove, and the chain roller shaft (34) serving as the second wheel shaft (3) also serves as a push-pull traction point, and the push-pull traction point is rotatably connected to the traction end (5) of the wire drawing trolley (1); The drive motor (20) and the sprocket (19) are positioned and mounted on a relatively stationary component with respect to the machine tool lower line arm (28), the drive motor (20) is transmission-connected to the sprocket (19), and the sprocket (19) is meshed with the chain (18); Thus, a chain guide rail (17), an open-loop chain (18), a sprocket (19) and a drive motor (20) cooperate to form a traction mechanism capable of pushing the wire drawing trolley (1) forward or pulling it backward to move along the lower wire feeding path.

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