Automatic wire threading method and device for wire cutting

Abstract

The invention relates to the field of linear cutting machine tools, and provides a linear cutting automatic wire threading method and device.The linear cutting automatic wire threading method is characterized by comprising the steps that a lead pipe moving detection wheel with the rotating speed detection function and a lead pipe driving wheel are adopted to control a lead pipe to move up and down from the lower portion of the lead pipe; when downward movement of the lead pipe is blocked, the lead pipe is controlled to ascend by a certain height and rotate by a certain angle to descend, so that the lead pipe is prevented from being damaged, and the success rate of the lead pipe penetrating through the wire penetrating hole is increased; two circular guide nozzles with variable-diameter semicircular grooves in the outer edges are adopted to rotate, a circular hole guide lead pipe and a guide molybdenum wire with the diameter of the lead pipe and the diameter of the molybdenum wire are formed, the position can be updated after the grooves forming the circular hole of the guide molybdenum wire are abraded, and the service life of the circular guide nozzles is prolonged; the automatic threading device is characterized by comprising a mounting plate, a self-protection lead tube driving device, a lead tube rotation driving device and a variable-diameter grooved wheel type guide nozzle, the failure rate of an automatic threading machine tool is reduced, the success rate of automatic threading is increased, and the service life of the guide nozzle is prolonged.

Description

Technical Field

[0001] The invention relates to the field of wire cutting machine tools and provides a wire cutting automatic wire threading method and device. Background Art

[0002] When processing porous workpieces, existing wire cutting machines need to pass molybdenum wire through the wire threading hole of each workpiece, which requires a lot of manpower. In recent years, several automatic wire threading machines have also appeared, and the automatic wire threading machine with the published patent number CN116786926A has the following defects: 1. The lead tube drives the lead tube fixed on the upper end of the slider to rise and fall through the slider on the module. In actual use, this method is easy to bend and damage when the lead tube starts to descend because it is relatively slender; 2. In actual use, due to the deviation of the position of the wire threading hole of the workpiece and the bending of the lead tube, the lead tube cannot accurately enter the wire threading hole; at the same time, most of the existing wire cutting machines are equipped with eye masks above and below the workpiece, through which the molybdenum wire passes from the center to increase the stability of the molybdenum wire. The eye masks are made of wear-resistant materials, but they will wear out after long-term use and need to be replaced, which is costly. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method and device for automatic wire threading in wire cutting, the automatic wire threading method is characterized in that: it includes using a wire tube moving detection wheel with a rotation speed detection function to elastically press the wire tube between the wire tube driving wheel and the wire tube driving wheel, and the wire tube driving wheel rotates to drive the wire tube to move up and down. When the downward movement of the lead tube is blocked, the lead tube moving detection wheel does not rotate. At this time, the lead tube driving wheel reverses a certain angle and then rotates forward to drive the lead tube to move up a certain height and then down; a lead tube rotation drive device is used to rotate the lead tube by a certain angle when moving up and down, so that the lower end of the lead tube is aligned with the wire threading hole, thereby increasing the success rate of the lead tube passing through the wire threading hole; the automatic wire threading method is characterized in that: it also includes using two circular guide tubes with semicircular grooves of varying diameters on the outer edges. The nozzle guides the lead tube and the molybdenum wire. When the groove sections with a radius greater than that of the lead tube are close to each other, the diameter of the circular hole formed in the area with an increased radius of the groove is slightly larger than that of the lead tube, and the lead tube passes through the circular hole; when the groove sections with a radius greater than that of the molybdenum wire are close to each other, a circular hole larger than the molybdenum wire is formed for guiding the molybdenum wire; when the groove with a radius greater than that of the molybdenum wire is worn out, the position of the groove can be updated to increase the service life of the guide nozzle; the automatic wire threading device for wire cutting is characterized in that it includes a mounting plate, a self-protection lead tube driving device, and a lead tube rotation driving device, the self-protection lead tube driving device includes a lead tube driving wheel and a lead tube movement detection wheel, the outer edges of the lead tube driving wheel and the lead tube movement detection wheel have a semicircular groove with a depth less than the radius of the lead tube, The lead tube driving wheel is driven by a numerical control motor, the lead tube movement detection wheel is equipped with a detection sheet with a light-transmitting groove on the outer edge and a photoelectric induction switch, which is in elastic contact with the lead tube driving wheel, and the rotation of the lead tube movement detection wheel is driven by the axial movement of the lead tube. When the movement of the lead tube is blocked, the lead tube driving wheel rotates while the lead tube movement detection wheel does not rotate, the lead tube driving wheel is installed on the numerical control motor shaft, the numerical control motor is installed on the mounting plate, the lead tube movement detection wheel is installed on the mounting plate through a rotating shaft, and the lead tube rotation drive device includes two rollers A and roller B installed on the mounting plate, and the axial direction is not at right angles to the axial direction of the lead tube, and the rollers A and B are installed on both sides of the lead tube in a cross shape, wherein roller A rotates The rotating shaft is installed on the mounting plate, the roller B is installed on the roller cylinder shaft, and the roller cylinder is installed on the mounting plate; the automatic wire threading device for wire cutting is also characterized in that it includes a first reducing groove wheel type guide nozzle and a second reducing groove wheel type guide nozzle, the reducing groove wheel type guide nozzle has a semicircular groove on the outer edge, one section of the semicircular groove has a radius greater than the radius of the lead tube, and the radius of the remaining part is greater than the radius of the molybdenum wire, the first reducing groove wheel type guide nozzle is installed on the rotating cylinder shaft, the rotating cylinder is installed on the mounting plate, the second reducing groove wheel type guide nozzle is meshed with the first reducing groove wheel type guide nozzle through a gear, and is installed on the mounting plate through a rotating shaft, the outer circle of the first reducing groove wheel type guide nozzle is equipped with a limit rod, and the mounting plate is provided with upper and lower limit pins and multiple lower limit holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Figure 1 It is a schematic diagram of the device of the present invention; Figure 2 It is a schematic diagram of a self-protection lead tube driving device; Figure 3 This is a schematic diagram of a variable diameter groove wheel type guide nozzle; Figure 4 This is a schematic diagram of the threading state of the variable diameter groove wheel type guide nozzle; Figure 5 This is a schematic diagram of the cutting state of the variable diameter groove wheel type guide nozzle; Figure 6 This is a schematic diagram of the molybdenum wire end detection and clamping body; Figure 7 Schematic diagram of the detection arm and the clamping arm; Figure 8 It is a schematic diagram of the lead tube rotation drive device.

[0005] The present invention will be further described below in conjunction with the accompanying drawings: Attached Figure 1 Schematic diagram of the device of the present invention, 01 is a mounting plate; 02 is a variable diameter groove wheel type guide nozzle; 03 is a guide for the lead tube; 04 is a guide wheel; 05 is a molybdenum wire end detection and clamping device; 06 is a lead tube moving detection wheel; 07 is a photoelectric detection switch; 08 is a lead tube upper end detection switch; 09 is a lead tube shield; 10 is a lead tube drive wheel; 11 is a lead tube lower end detection switch; 12 is a lead tube drive wheel motor; 13 is a molybdenum wire end detection and clamping device Device detection arm; 14 is the cylinder of the molybdenum wire end detection and clamping device; 15 is the clamping arm of the molybdenum wire end detection and clamping device; 16 is the upper limit pin; 17 is the variable diameter groove wheel type guide nozzle rotating cylinder; 18 is the variable diameter groove wheel type guide nozzle limiting rod; 19 is the lower limit pin; 110 is the lower limit pin hole; 111 is the variable diameter groove wheel type guide nozzle gear; 112 is the molybdenum wire; 113 is the roller B of the lead tube rotation driving device; 114 is the roller A of the lead tube rotation driving device.

[0006] Attached Figure 2 It is a schematic diagram of a self-protection lead tube driving device, wherein 20 is a detection switch at the lower end of the lead tube; 21 is a detection piece with a light-transmitting groove on the outer edge installed on the lead tube moving detection wheel; 22 is a rotating shaft of the lead tube moving detection wheel; 23 is a photoelectric sensor switch; 24 is a spring; 25 is a spring bracket; 26 is a rotating shaft of the lead tube moving detection wheel bracket; 27 is a lead tube shield; 28 is a lead tube shield fixing block; 29 is the lead tube; 210 is a detection switch at the upper end of the lead tube; 211 is a lead tube moving detection wheel bracket; 212 is a groove on the outer edge of the lead tube driving wheel; 213 is a lead tube driving wheel motor; and 214 is a lead tube driving wheel.

[0007] Attached Figure 330 is a schematic diagram of a variable diameter groove wheel type guide nozzle, 31 is a second variable diameter groove wheel type guide nozzle rotating shaft, 32 is a guide tube guide fixing block, 33 is a guide tube guide, 34 is a guide wheel, 35 is a guide wheel seat, 36 is a funnel-shaped opening of a center hole of a guide tube, 37 is a center hole of a guide tube, 38 is an upper limit pin, 39 is a variable diameter groove wheel type guide nozzle gear, 310 is a variable diameter groove wheel type guide nozzle limiting rod, 311 is a lower limit pin, 312 is a lower limit pin hole, 313 is a first variable diameter groove wheel type guide nozzle, and 314 is a first variable diameter groove wheel type guide nozzle rotating cylinder shaft.

[0008] Attached Figure 4 40 is a schematic diagram of the threading state of the reducing groove wheel type guide nozzle, 41 is the first reducing groove wheel type guide nozzle, 42 is a reducing groove wheel type guide nozzle slightly larger than the radius groove of the molybdenum wire, 43 is a reducing groove wheel type guide nozzle slightly larger than the round hole formed by the guide tube groove, 44 is the reducing groove wheel type guide nozzle rotating cylinder shaft, 45 is a mounting plate, 46 is a reducing groove wheel type guide nozzle rotating cylinder, 47 is an upper limit pin, 48 is a reducing groove wheel type guide nozzle limiting rod, 49 is a lower limit pin, and 410 is a lower limit pin hole.

[0009] Attached Figure 5 50 is a schematic diagram of the cutting state of the reducer groove wheel type guide nozzle, 50 is a reducer groove wheel type guide nozzle slightly larger than the molybdenum wire radius groove; 51 is a reducer groove wheel type guide nozzle slightly larger than the molybdenum wire radius groove close to the circular hole formed; 52 is a reducer groove wheel type guide nozzle slightly larger than the lead tube radius groove.

[0010] Attached Figure 6 It is a schematic diagram of the main body of the molybdenum wire end detection and clamping device, 60 is the main body of the molybdenum wire end detection and clamping device; 61 is the air-avoiding hole through which the wire hook passes in the middle of the main body of the molybdenum wire end detection and clamping device; 62 is the wire hook; 63 is the rotating shaft hole of the detection arm and the clamping arm; 64 is the lead-in tube through hole; 65 is the mounting groove for the detection arm and the clamping arm; 66 is the gap where the molybdenum wire slides to the guide wheel when the molybdenum wire is hooked by the wire hook and pulled back.

[0011] Attached Figure 7 It is a schematic diagram of the detection arm and the clamping arm, 70 is the clamping arm; 71 is the rotating shaft hole at one end of the clamping arm; 72 is the detection arm; 73 is the cylinder top block; 74 is the cylinder; 75 is the spring; and 76 is the detection switch.

[0012] Attached Figure 8 It is a schematic diagram of the lead tube rotation drive device, 80 is roller B; 81 is the rotation axis of roller B; 82 is the cylinder axis; 83 is the cylinder; 84 is the cylinder bracket; 85 is the rotation axis of roller A; 86 is roller A; and 87 is the lead tube. DETAILED DESCRIPTION

[0013] As shown in the accompanying drawings: the lead tube driving wheel motor 12 is a CNC motor, which is installed on the mounting plate 01, the lead tube driving wheel 10 is installed on the lead tube driving wheel motor 12 shaft, the outer edge of the lead tube driving wheel has a semicircular groove 212 with a depth less than the radius of the lead tube, the outer edge of the lead tube moving detection wheel 06 has a semicircular groove with a depth less than the radius of the lead tube, and is installed on the lead tube moving detection wheel bracket 211 through the lead tube moving detection wheel rotating shaft 22, and the lead tube moving detection wheel bracket 211 is moved by the lead tube The rotating shaft 26 of the movable detection wheel bracket is installed on the mounting plate 01. A spring 24 is installed between the lead tube moving detection wheel bracket 211 and the spring bracket 25 installed on the mounting plate 01. The lead tube moving detection wheel 06 presses the lead tube 29 between the two wheel grooves under the action of the spring 24. The two wheels do not contact each other. When threading, the lead tube driving wheel 214 rotates to drive the lead tube 29 to descend, and the lead tube 29 drives the lead tube moving detection wheel to rotate. The detection wheel 06 installed on the outer edge of the lead tube moving detection wheel has a light-transmitting groove. The sheet 21 rotates, and the photoelectric induction switch 23 installed on the mounting plate 01 outputs a pulse signal by detecting the detection sheet 21 with a light-transmitting groove on the outer edge. When the lead tube 29 is blocked from descending, the lead tube 29 stops. At this time, the lead tube movement detection wheel 06 does not rotate, and the photoelectric induction switch 23 has no pulse signal output. The control system controls the lead tube drive wheel motor 213 to reverse, and the lead tube 29 rises. The lead tube drive wheel reverses a certain angle and then rotates forward, and the lead tube 29 descends. At this time, the cylinder 84 acts, and the roller B80 and the roller B80 move forward. Roller A86 presses the lead tube 87 tightly. Since roller B80 and roller A86 press the lead tube 87 in a cross shape, roller B80 and roller A86 will generate a rotational force on the lead tube 87 to rotate the lead tube 87 when the lead tube 87 descends. When the lead tube 87 rotates a certain angle, cylinder 84 is closed, and roller B80 and roller A86 are separated. Roller A86 is installed on the mounting plate 01 through roller A rotating shaft 85, and roller B80 is installed on cylinder shaft 82 through roller B rotating shaft 81. Cylinder 83 It is installed on the mounting plate 01 through the cylinder bracket 84; in the actual production process, the reason why the lead tube is blocked from descending is generally that the position of the wire threading hole deviates from the correct position and the lead tube is bent. When the deviation direction of the wire threading hole is inconsistent with the bending direction of the lead tube, the lead tube cannot smoothly enter the wire threading hole. At this time, the self-protection lead tube driving device and the lead tube rotation driving device drive the lead tube to repeatedly rise and fall in a short distance and rotate at the same time, and the end of the lead tube rotates around the center of the correct position. When the deviation direction of the wire threading hole is consistent with the bending direction of the lead tube, the lead tube smoothly enters the wire threading hole to complete the wire threading action.

[0014] As shown in the attached drawings: the rotary cylinder 17 is mounted on the mounting plate 01, the first variable diameter groove wheel type guide nozzle 313 is mounted on the first variable diameter groove wheel type guide nozzle rotating cylinder shaft 314, the second variable diameter groove wheel type guide nozzle 30 is mounted on the mounting plate 01 through the second variable diameter groove wheel type guide nozzle rotating shaft 31, the second variable diameter groove wheel type guide nozzle 30 is meshed with the first variable diameter groove wheel type guide nozzle 313 through the variable diameter groove wheel type guide nozzle gear 39, the variable diameter groove wheel type guide nozzle limit rod 310 is mounted on the outer circle of the first variable diameter groove wheel type guide nozzle, and the variable diameter groove wheel type guide nozzle rotating cylinder 17 rotates when threading, and the variable diameter groove wheel type guide nozzle The limit rod 48 rotates to the upper limit pin 47, and the reducing groove wheel type guide nozzle is slightly larger than the radius groove 52 of the lead tube to form a circular hole 43, and the lead tube passes through the circular hole 43. After the wire threading is completed, the reducing groove wheel type guide nozzle rotating cylinder 17 rotates, and the reducing groove wheel type guide nozzle limit rod 48 rotates to the lower limit pin 49, and the reducing groove wheel type guide nozzle is slightly larger than the radius groove 50 of the molybdenum wire to form a circular hole 51, and the molybdenum wire passes through the circular hole 51 for cutting processing. When the circular hole 51 is worn after a certain period of use, it is only necessary to move the lower limit pin 49 to another lower limit pin hole 410, and the circular hole 51 will be an unworn aperture.

[0015] As shown in the attached drawings: the main body 60 of the molybdenum wire end detection and clamping device is installed on the mounting plate 01, and there is an air-avoiding hole 61 for the wire hook to pass through at the bottom, and the molybdenum wire is hooked by the wire hook and slides to the gap 66 of the guide wheel when it is pulled back. The lead-in tube through hole 64 is tangent to the bottom of the detection arm and the clamping arm mounting groove 65. One end of the detection arm 72 and the clamping arm 70 is connected to the main body 60 of the molybdenum wire end detection and clamping device through the rotating axis installed in the rotating axis hole 63 of the detection arm and the clamping arm, and one end is connected to the mounting plate 01 through a spring 75. When threading, it is installed on the mounting plate 01 The cylinder 74 pushes the detection arm 72 and the clamping arm 70 apart through the cylinder top block 73, and the lead tube passes downward from the lead tube through-hole 64 to pull the end of the molybdenum wire to above the lead tube through-hole 64. At this time, the cylinder 74 is released, and the molybdenum wire is pulled back through the wire reel. When the end of the molybdenum wire is lower than the detection arm 72, the detection switch 76 installed on the mounting plate 01 outputs a detection signal because the detection arm 72 does not press the molybdenum wire to enter the detection range, and the wire reel stops pulling back. At this time, the clamping arm 70 clamps the molybdenum wire wire hook to hook the end of the molybdenum wire and pull it to the wire reel. The molybdenum wire slides from the gap 66 to the guide wheel 04.

[0016] As shown in the accompanying drawings: the lead tube shield 09 is installed on the mounting plate 01 to protect the lead tube, the lead tube upper end detection switch 08 is installed on the mounting plate 01, and when threading, the upper end of the lead tube drops to the lead tube upper end detection switch 08 and stops, the lead tube lower end detection switch 11 is installed on the mounting plate 01, and when threading, the lower end of the lead tube rises to the lead tube lower end detection switch 11 and stops, the guide wheel 34 is installed on the guide wheel seat 35, and the guide wheel seat 35 is installed on the mounting plate 01, and the lead tube guide 33 is installed on the mounting plate 01 through the lead tube guide fixing block 32. When threading, the lead tube passes through the funnel-shaped opening 36 of the center hole of the lead tube guide and the center hole 37 of the lead tube guide into the first and second reducing groove wheel-type guide nozzles which are slightly larger than the circular hole 43 formed near the lead tube groove, and then passes through the workpiece to guide the molybdenum wire, and the lead tube guide 33 plays the role of guiding the lead tube.

[0017] The actions of the motor and the cylinder are controlled by PLC.

Claims

1. A method for automatic wire threading in wire cutting, characterized in that: The invention comprises adopting a lead tube moving detection wheel with a rotation speed detection function to elastically compress the lead tube between the lead tube driving wheel, and the lead tube driving wheel rotates to drive the lead tube to move up and down, and the rotation of the lead tube moving detection wheel is driven by the lead tube. When the downward movement of the lead tube is blocked, the lead tube moving detection wheel does not rotate. At this time, the lead tube driving wheel reverses a certain angle and then rotates forward to drive the lead tube to ascend a certain height and then descend; a lead tube rotating drive device is adopted to make the lead tube rotate a certain angle when moving up and down, so that the lower end of the lead tube is aligned with the wire threading hole, thereby increasing the success rate of the lead tube passing through the wire threading hole.

2. A method for automatic wire threading of wire cutting according to claim 1, characterized in that: It also includes a circular guide nozzle with two semicircular grooves of variable diameter on the outer edge to guide the lead tube and the molybdenum wire. When the radius of the circular guide nozzle with the semicircular groove of variable diameter on the outer edge is larger than the groove section of the lead tube, the diameter of the circular hole formed in the area where the groove radius is increased is slightly larger than the lead tube, and the lead tube passes through the circular hole; when the radius is larger than the molybdenum wire groove section, a circular hole larger than the molybdenum wire is formed for guiding the molybdenum wire; when the radius is larger than the molybdenum wire groove, the groove position can be updated after wear, thereby increasing the service life of the guide nozzle.

3. An automatic wire threading device for wire cutting as claimed in claim 1, characterized in that: It includes a mounting plate, a self-protection lead tube driving device, and a lead tube rotation driving device. The self-protection lead tube driving device includes a lead tube driving wheel and a lead tube movement detection wheel. The lead tube driving wheel and the lead tube movement detection wheel have semicircular grooves with a depth less than the radius of the lead tube on their outer edges. The lead tube driving wheel is driven by a numerically controlled motor. The lead tube movement detection wheel is equipped with a detection sheet with a light-transmitting groove on its outer edge and a photoelectric induction switch, which is in elastic contact with the lead tube driving wheel. The rotation of the lead tube movement detection wheel is driven by the axial movement of the lead tube. When the movement of the lead tube is blocked, the detection wheel is turned on. The lead tube driving wheel rotates while the lead tube movement detection wheel does not rotate, the lead tube driving wheel is installed on the CNC motor shaft, the CNC motor is installed on the mounting plate, the lead tube movement detection wheel is installed on the mounting plate through a rotating shaft, the lead tube rotation drive device includes two rollers A and roller B installed on the mounting plate, the axes of which are not installed at right angles to the axis of the lead tube, the rollers A and rollers B are installed on both sides of the lead tube in a cross shape, wherein roller A is installed on the mounting plate through a rotating shaft, roller B is installed on the roller cylinder shaft, and the roller cylinder is installed on the mounting plate.

4. An automatic wire threading device for wire cutting as claimed in claim 2, characterized in that: It comprises a first reducing groove wheel type guide nozzle and a second reducing groove wheel type guide nozzle, the outer edge of the reducing groove wheel type guide nozzle has one or more circles of semicircular grooves, the radius of one section of the semicircular groove is larger than the radius of the lead tube, and the radius of the remaining part is larger than the radius of the molybdenum wire, the first reducing groove wheel type guide nozzle is installed on the rotating cylinder shaft, the rotating cylinder is installed on the mounting plate, the second reducing groove wheel type guide nozzle is meshed with the first reducing groove wheel type guide nozzle through a gear, and is installed on the mounting plate through a rotating shaft, the outer circle of the first reducing groove wheel type guide nozzle is equipped with a limit rod, and the mounting plate is provided with upper and lower limit pins and a plurality of lower limit holes.

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