The welding wire is fed to a wire feeding mechanism with measurable length and a laser welding machine.

Abstract

This utility model relates to the field of solder feeding device technology, and in particular to a wire feeding mechanism with measurable welding wire feeding length and a laser welding machine. The wire feeding mechanism includes a base, a wire feeding drive assembly, a wire outlet nozzle, and an encoder. The wire feeding drive assembly has a motor, a drive wheel, and a driven wheel. The encoder shaft is connected to the driven wheel for transmission to detect the angular displacement of the driven wheel. This utility model achieves wire feeding by having the motor drive the drive wheel to rotate, and the drive wheel pushes the welding wire forward. Since the driven wheel rotates by the pull of the welding wire, the welding wire will inevitably move as long as the driven wheel rotates. The distance the welding wire moves is proportional to the number of rotations of the driven wheel. That is, by obtaining the number of rotations of the driven wheel in real time through the encoder, the forward distance of the welding wire can be known, so as to monitor the wire feeding length in real time and achieve precise control of the welding wire feeding amount.

Description

Technical Field

[0001] This utility model relates to the field of solder feeding device technology, and in particular to a wire feeding mechanism with measurable welding wire feeding and a laser welding machine. Background Technology

[0002] Laser soldering machines with solder wire feeding are used for soldering precision components such as IT products, PCB sockets, and wires. They mainly consist of a laser that emits a laser to heat the solder pads and an automatic solder feeding device that automatically feeds solder wire.

[0003] Existing automatic solder feeding devices include a motor, a drive wheel, and a driven wheel. The solder wire is located between the drive wheel and the driven wheel. When the motor drives the drive wheel to rotate, the drive wheel moves the solder wire forward to feed it. However, existing automatic solder feeding devices cannot detect the length of the solder wire during the feeding process. They rely on controlling the motor rotation and rotation time for control. The entire process cannot be closed-loop. For example, if the drive wheel and the solder wire slip, it is equivalent to the solder wire not moving, which will lead to inaccurate control of the solder wire feeding length and failure to provide feedback on the actual wire feeding situation.

[0004] Furthermore, if wire blockage occurs during the wire feeding process, existing technologies typically monitor the blockage by setting up a photoelectric sensor at the wire exit section. However, after the solder wire becomes blocked, it needs to be bent into a ball to push the photoelectric sensor forward so that the photoelectric sensor can detect the blockage. But by this time, there is already a lag. That is, in existing technologies, an alarm is usually triggered only after the solder wire has become blocked to a certain extent, which has a certain lag. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to solve the problem of inaccurate control of the wire feeding length in the automatic tin feeding device of the laser welding machine in the prior art, a wire feeding mechanism with measurable wire feeding length is provided, and a laser welding machine including the above-mentioned wire feeding mechanism with measurable wire feeding length is provided.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a wire feeding mechanism with measurable length, comprising:

[0007] Base;

[0008] The wire feeding drive assembly has a motor, a drive wheel, and a driven wheel. The motor is mounted on a base and is used to drive the drive wheel to rotate. The drive wheel and the driven wheel are configured such that when the welding wire passes between the drive wheel and the driven wheel, the driven wheel presses the welding wire against the drive wheel, and the rotation of the drive wheel drives the welding wire to move, which in turn pulls the driven wheel to rotate.

[0009] The wire outlet nozzle is mounted on the base. When the drive wheel drives the welding wire forward, the wire outlet nozzle delivers the welding wire for welding.

[0010] And an encoder, the encoder's shaft being connected to the driven wheel to detect the angular displacement of the driven wheel.

[0011] Furthermore, the encoder signal is connected to the control module, and the control module is connected to the alarm device.

[0012] When the motor drives the drive wheel to rotate, the encoder monitors in real time whether the driven wheel is rotating. When the driven wheel stops rotating, the control module controls the alarm device to sound an alarm.

[0013] Furthermore, an upstream gap, a meshing area, and a downstream gap are formed between the driving wheel and the driven wheel, which are distributed sequentially along the direction of the welding wire's movement. When the welding wire is in the meshing area, it is in contact with both the driving wheel and the driven wheel.

[0014] An upstream guide nozzle and a downstream guide nozzle are fixed on the base;

[0015] The upstream guide nozzle has an upstream channel for guiding the welding wire to move toward the meshing area, and one end of the upstream guide nozzle near the meshing area extends into the upstream gap.

[0016] The downstream guide nozzle has a downstream channel for guiding the welding wire toward the wire outlet nozzle, and one end of the downstream guide nozzle near the meshing area extends into the downstream gap; the upstream channel and the downstream channel are coaxially arranged.

[0017] Furthermore, the upstream guide nozzle is provided with an upstream contour structure that is passed through by the upstream channel at one end near the meshing area. The upstream contour structure extends into the upstream gap, and its cross-sectional area gradually decreases along the direction from the upstream gap to the meshing area.

[0018] The downstream guide nozzle has a downstream contour structure that is passed through by the downstream channel at one end near the meshing area. The downstream contour structure extends into the downstream gap, and its cross-sectional area gradually decreases along the direction from the downstream gap to the meshing area.

[0019] Furthermore, the wire outlet nozzle is fixedly connected to the end of the downstream guide nozzle away from the engagement area, and they are in communication with each other.

[0020] The inner wall of the downstream channel has a notch that extends to the outer peripheral wall of the downstream guide nozzle, and a cantilever is formed at the notch with one end suspended and the other end connected to the inner wall of the notch.

[0021] A base plate is fixed on the base, and a through hole matching the downstream guide nozzle is provided on the base plate. The downstream guide nozzle is detachably fixed in the through hole. The wire outlet nozzle is inserted into the downstream channel, and a fastener is detachably installed on the downstream guide nozzle. The fastener forces the cantilever to deform into the downstream channel and abut against the outer peripheral wall of the wire outlet nozzle.

[0022] Furthermore, the downstream guide nozzle includes a first guide tube with a flange protruding radially, a second guide tube inserted in the first guide tube and extending away from the upstream guide nozzle, and a flange located between the flange and the base plate to fix the two together.

[0023] Furthermore, both the driving wheel and the driven wheel are gear structures, and when the welding wire passes between the driving wheel and the driven wheel, the outer peripheral wall of the rubber ring and the outer peripheral wall of the driven wheel come into contact with the welding wire.

[0024] Furthermore, the upstream channel includes a first equal-diameter section, a contraction section, a second equal-diameter section, and an expansion section formed to guide the welding wire into the meshing area, arranged sequentially along the direction gradually approaching the meshing area;

[0025] The downstream channel expands at one end near the meshing area to form a lower guide section for guiding the welding wire into it.

[0026] This utility model also provides a laser welding machine, including the above-mentioned wire feeding mechanism with measurable length.

[0027] The beneficial effects of this invention are as follows: The wire feeding mechanism of this invention, with measurable wire length, uses a motor to drive a rotating drive wheel, which in turn propels the wire forward. Since the driven wheel rotates only due to the pull of the wire, the wire will inevitably move whenever the driven wheel rotates. Furthermore, the distance the wire moves is proportional to the number of rotations of the driven wheel. That is, by acquiring the number of rotations of the driven wheel in real time using an encoder, the forward distance of the wire can be determined, allowing for real-time monitoring of the wire feeding length and precise control of the wire feeding amount. It also overcomes the lag problem of traditional methods that only trigger an alarm after the wire has become clogged to a certain extent. Based on the precise measurement of the wire feeding length, the encoder can detect changes in data in real time immediately when wire clog may occur, enabling wire clog alarm control and preventing the wire from accumulating inside the feeding mechanism, thus achieving a truly non-clogging effect.

[0028] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a three-dimensional schematic diagram of the welding wire being fed to one side of the wire feeding mechanism of this utility model, which has a measurable length.

[0031] Figure 2 This is a three-dimensional schematic diagram of the other side of the wire feeding mechanism of this utility model, which feeds the welding wire to a wire feeding mechanism with measurable length.

[0032] Figure 3This is a front view schematic diagram of the wire feeding mechanism of this utility model, which provides welding wire with a measurable length.

[0033] Figure 4 This is a cross-sectional schematic diagram of the wire feeding mechanism of this utility model along the wire feeding path, which provides a wire feeding mechanism with measurable length.

[0034] Figure 5 yes Figure 4 A magnified view of part A in the middle;

[0035] Figure 6 This utility model shows the upstream guide nozzle and the downstream guide nozzle extending into the upstream gap and the downstream gap, respectively.

[0036] Figure 7 This is a schematic diagram showing the connection between the driven wheel, the swing arm, and the encoder;

[0037] Figure 8 This is a breakdown diagram of the downstream guide nozzle and the wire outlet nozzle;

[0038] Figure 9 This is a three-dimensional schematic diagram of the first guide tube;

[0039] Figure 10 This is the front view of the laser welding machine.

[0040] In the picture:

[0041] 1. Base;

[0042] 2. Electric motor;

[0043] 3. Drive wheel;

[0044] 4. Driven wheel, 401; rocker arm, 402; spring plunger;

[0045] 5. Cable feed nozzle;

[0046] 6. Encoder;

[0047] 7. Upstream guide nozzle; 701. Upstream channel; 7011. First equal diameter section; 7012. Contraction section; 7013. Second equal diameter section; 7014. Upper guide section; 702. Upstream contouring structure;

[0048] 8. Downstream guide nozzle; 801. Downstream channel; 8011. Lower guide section; 802. Downstream contour structure; 803. Notch; 804. Cantilever; 805. First guide tube; 806. Second guide tube; 807. Flange; 8071. Protrusion; 808. Flange; 8081. Insertion groove; 809. Plane;

[0049] 9. Base plate, 901, perforation;

[0050] 10. Upstream gap; 11. Meshing zone; 12. Downstream gap; 13. Welding wire; 14. Cylinder; 15. Machine body; 16. Welding wire spool; 17. Laser welding head; 18. Transverse unit; 19. Rotation unit; 20. Laser beam. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0052] like Figure 1-9 As shown, a wire feeding mechanism with measurable length for feeding welding wire includes a base 1, a wire feeding drive assembly, a wire outlet nozzle 5, and an encoder 6.

[0053] like Figure 1-4 As shown, the wire feeding drive assembly has a motor 2, a drive wheel 3, and a driven wheel 4. The motor 2 is mounted on the base 1 and is used to drive the drive wheel 3 to rotate. The drive wheel 3 and the driven wheel 4 are arranged such that when the welding wire 13 passes between the drive wheel 3 and the driven wheel 4, the driven wheel 4 presses the welding wire 13 against the drive wheel 3, and the rotation of the drive wheel 3 drives the welding wire 13 to move, which in turn pulls the driven wheel 4 to rotate. Preferably, the axis of the drive wheel 3 is arranged parallel to the axis of the driven wheel 4.

[0054] The mounting structure of the drive wheel 3 can be, but is not limited to, the following: the drive wheel 3 can be rotatably mounted on the base 1; a driven gear can be coaxially mounted on the drive wheel 3; a drive gear is coaxially fixedly mounted on the main shaft of the motor 2; the meshing of the drive gear and the driven gear can achieve a rigid transmission connection between the motor and the drive wheel, improving the structural compactness; for ease of layout, the drive gear can also be connected to the driven gear through one or two or more transmission gears. If there is one transmission gear, both the drive gear and the driven gear mesh with the transmission gear; if there are two or more transmission gears, two adjacent transmission gears mesh, and there are two transmission gears that mesh with the drive gear and the driven gear respectively.

[0055] like Figure 7As shown, the installation structure of the driven wheel 4 can be, but is not limited to, the following installation structure: the swing arm 401 can be specifically hinged on the base 1, the driven wheel 4 is rotatably installed on one end of the swing arm 401, and an elastic element can also be provided on the base 1 to abut against the other end of the swing arm 401, so that the driven wheel 4 on the swing arm 401 presses the welding wire 13 onto the driving wheel 3. The elastic element can be a spring or a spring plunger 402. For example, when the elastic element is a spring plunger 402, the spring plunger 402 is threadedly fixed on the base 1, and the telescopic end of the spring plunger 402 abuts against the swing arm 401, so that the driven wheel 4 on the swing arm 401 presses the welding wire 13 onto the driving wheel 3.

[0056] For ease of layout, further, such as Figure 1 As shown, the driving wheel 3, driven wheel 4, swing arm 401, and wire outlet 5 are located on the front side of the base 1; Figure 2 As shown, motor 2 is located on the back side of base 1;

[0057] The wire outlet nozzle 5 is mounted on the base 1. When the drive wheel 3 drives the welding wire 13 forward, the wire outlet nozzle 5 delivers the welding wire 13 for welding. The welding wire 13 can be, but is not limited to, tin wire.

[0058] The encoder 6's rotating shaft is connected to the driven wheel 4 to detect the angular displacement of the driven wheel 4. After the encoder 6 generates an electrical signal, it is processed by a programmable logic controller (PLC), control module, etc. Specifically, the encoder 6's rotating shaft can be coaxially fixedly connected to one end of the driven wheel 4 near the back of the base 1. The base 1 can have mounting holes to allow the encoder 6 to pass through or accommodate the encoder 6. Furthermore, the encoder 6 can be fixed on the swing arm 401.

[0059] The wire feeding mechanism, whose length can be measured, is driven by motor 2 to rotate drive wheel 3. Drive wheel 3 pushes wire 13 forward to feed the wire. Since driven wheel 4 rotates by being pulled by wire 13, wire 13 will inevitably move as long as driven wheel 4 rotates. The distance wire 13 moves is proportional to the number of rotations of driven wheel 4. That is, by obtaining the number of rotations of driven wheel 4 in real time through encoder 6, the forward distance of wire 13 can be known, so as to monitor the feeding length of wire 13 in real time and achieve precise control of the wire feeding amount.

[0060] In some examples, encoder 6 is signal-connected to control module, and control module is signal-connected to alarm device. Encoder 6 can be specifically signal-connected to control module, and control module calculates the forward distance of welding wire 13 based on the signal fed back by encoder 6.

[0061] When the motor 2 drives the drive wheel 3 to rotate, the encoder 6 monitors in real time whether the driven wheel 4 is rotating. When the driven wheel 4 stops rotating, the control module controls the alarm device to sound an alarm. The alarm device can be an alarm device in the form of issuing a voice alarm signal, vibration alarm signal or light alarm signal in the prior art. This embodiment does not limit this.

[0062] If the welding wire 13 at the wire outlet 5 becomes clogged, it will stop advancing at the driven wheel 4, and the driven wheel 4 will immediately stop rotating, triggering an alarm. This rapid response avoids or reduces the phenomenon of welding wire 13 accumulating, bending, and tangling when clogged, eliminating the lag in welding wire 13 blockage detection. It also solves the problem of slow response to blockage, preventing the welding wire 13 from becoming clogged during welding and causing the laser to damage the welding pad.

[0063] In some examples, such as Figure 5 As shown, an upstream gap 10, a meshing area 11, and a downstream gap 12 are formed between the driving wheel 3 and the driven wheel 4, which are distributed sequentially along the forward direction of the welding wire 13. When the welding wire 13 is in the meshing area 11, it is in contact with both the driving wheel 3 and the driven wheel 4.

[0064] An upstream guide nozzle 7 and a downstream guide nozzle 8 are fixed on the base 1;

[0065] The upstream guide nozzle 7 has an upstream channel 701 for guiding the welding wire 13 to move toward the meshing area 11, and one end of the upstream guide nozzle 7 near the meshing area 11 extends into the upstream gap 10.

[0066] The downstream guide nozzle 8 has a downstream channel 801 for guiding the welding wire 13 to move toward the wire outlet nozzle 5, and one end of the downstream guide nozzle 8 near the meshing area 11 extends into the downstream gap 12; the upstream channel 701 and the downstream channel 801 are coaxially arranged.

[0067] This design shortens the distance between the upstream channel 701 and the downstream channel 801, allowing the welding wire 13 to be guided by the upstream guide nozzle 7 or the downstream guide nozzle 8 to extend its path when passing between the driving wheel 3 and the driven wheel 4. This greatly reduces the risk of the welding wire 13 bending, as the welding wire 13 is less prone to bending. This indirectly increases the wire feeding force of the welding wire 13, providing reliable guidance for the welding wire 13 to pass through the meshing area 11 for the first time. There is no need to pull the swing arm 401 away from the driving wheel 3, making it convenient and quick to manually thread the welding wire 13.

[0068] In some examples, the upstream guide nozzle 7 is provided with an upstream contour structure 702 that is passed through by the upstream channel 701 at one end near the engagement area 11. The upstream contour structure 702 extends into the upstream gap 10, and its cross-sectional area gradually decreases along the direction from the upstream gap 10 to the engagement area 11.

[0069] The downstream guide nozzle 8 is provided with a downstream contour structure 802 that is passed through by the downstream channel 801 at one end near the meshing area 11. The downstream contour structure 802 extends into the downstream gap 12, and its cross-sectional area gradually decreases along the direction from the downstream gap 12 to the meshing area 11.

[0070] This can further shorten the distance between the upstream channel 701 and the downstream channel 801;

[0071] For example, the upstream conforming structure 702 and the downstream conforming structure 802 can be specifically as follows:

[0072] Both sides of the upstream contouring structure 702 and both sides of the downstream contouring structure 802 are arc surfaces;

[0073] One side of the upstream contouring structure 702 (e.g.) Figure 6 The center of the arc surface on the left side of the paper direction (as shown in the diagram), the center of the arc surface on one side of the downstream contour structure 802, and the center of the driven wheel 4 are all located on the side of the meshing area 11 away from the driving wheel 3.

[0074] One side of the upstream contouring structure 702 (e.g.) Figure 6 The center of the arc surface on the right side of the paper (as shown in the diagram), the center of the arc surface on one side of the downstream contour structure 802, and the center of the driving wheel 3 are all located on the side of the meshing area 11 away from the driven wheel 4.

[0075] This allows the upstream contouring structure 702 and the downstream contouring structure 802 to be closer to the driving wheel 3 and the driven wheel 4, thereby reducing the distance between the upstream channel 701 and the downstream channel 801, improving the guiding effect on the welding wire 13, and promoting the transmission of the welding wire 13.

[0076] In some examples, such as Figure 1 , Figure 2 , Figure 4 and Figure 7 As shown, the wire outlet nozzle 5 and the downstream guide nozzle 8 are fixedly connected at the end away from the meshing area 11 and are connected to each other; the pre-feeding design of directly connecting the downstream guide nozzle 8 and the wire outlet nozzle 5 greatly reduces the transmission path of the welding wire 13 and avoids the serious problem of the welding wire 13 being seriously affected by the large shaking in the Teflon tube, thereby improving the wire feeding accuracy.

[0077] A notch 803 extending to the outer peripheral wall of the downstream guide nozzle 8 is provided on the inner wall of the downstream channel 801, and a cantilever 804 is formed at the notch 803 with one end suspended and the other end connected to the inner wall of the notch 803. The cantilever 804 may be, but is not limited to, a cantilever 804 capable of elastic deformation.

[0078] A base plate 9 is fixed on the base 1. A through hole 901 matching the downstream guide nozzle 8 is provided on the base plate 9. The downstream guide nozzle 8 is detachably fixed in the through hole 901. For example, a fastening screw is threaded on the base plate 9, and the threaded end of the fastening screw abuts against the downstream guide nozzle 8. The threaded nozzle 5 is inserted into the downstream channel 801. A fastener is detachably installed on the downstream guide nozzle 8. The fastener forces the cantilever 804 to deform into the downstream channel 801 and abut against the outer peripheral wall of the threaded nozzle 5. The fastener can be a screw and is threadedly connected to the downstream guide nozzle 8. In this way, when the fastener is tightened, it can compress the cantilever 804 to deform and press the threaded nozzle 5, thereby pressing and fixing the threaded nozzle 5 in the downstream guide nozzle 8, thus avoiding the disadvantage of directly pressing the threaded nozzle 5 with a fastener, which is easy to damage the structure of the threaded nozzle 5. Meanwhile, the downstream guide nozzle 8 will be further pressed into the through hole 901 by the fastener, improving the stability of the downstream guide nozzle 8; the cantilever 804 can also be designed with a first plane 809 for the end of the fastener to abut, improving the installation stability of the thread outlet nozzle 5; when the fastener is loosened, the cantilever 804 releases the pressure on the thread outlet nozzle 5, and the thread outlet nozzle 5 can move freely along the downstream channel 801 of the downstream guide nozzle 8, thereby realizing the quick replacement of the thread outlet nozzle 5.

[0079] The wire nozzle 5 can be, but is not limited to, a stainless steel tube, to facilitate length changes and because the material is inexpensive. Welding wires 13 of different diameters can simply be replaced with stainless steel tubes of different inner diameters.

[0080] In some examples, the downstream guide nozzle 8 includes a first guide tube 805 with a flange 807 protruding radially, a second guide tube 806 inserted in the first guide tube 805 and extending away from the upstream guide nozzle 7, and a flange 808 located between the flange 807 and the base plate 9 to fix the two. The first guide tube 805 and the second guide tube 806 together form the downstream channel 801. The notch 803 and the cantilever 804 are both located on the second guide tube 806. The downstream contour structure 802 is located on the first guide tube 805. After the welding wire 13 extends out from the meshing area 11, it moves sequentially through the first guide tube 805, the second guide tube 806 and the wire outlet nozzle 5.

[0081] Specifically, the first guide tube 805 has a insertion hole for the second guide tube 806 to be inserted in the direction opposite to the upstream guide nozzle 7. The second guide tube 806 is inserted into the first guide tube 805 through the insertion hole and partially extends out of the first guide tube 805. The fastener passes through the first guide tube 805 and is threadedly connected to it. When the fastener is tightened, the head of the fastener abuts against the cantilever 804 in the second guide tube 806 to press the threaded nozzle 5 in the second guide tube 806. At the same time, the fastener can fix the first guide tube 805 and the second guide tube 806.

[0082] Flange 808 is fitted outside the first guide tube 805 and passes through the through hole 901. Bolts pass through flange 807 and flange 808 in sequence and enter the base plate 9 to fix the downstream guide nozzle 8 to the base plate 9. The number of bolts can be, but is not limited to, one, two or three, and they are distributed circumferentially. Flange 807 protrudes towards flange 808 to form a protrusion 8071. Flange 808 is recessed to form an embedding groove 8081 for the protrusion 8071 to be embedded. The protrusion 8071 and the embedding groove 8081 can be positioned by the cooperation of the protrusion 8071 and the embedding groove 8081. At the same time, the first guide tube 805 can be positioned so that its downstream contour structure 802 is aligned with the downstream gap 12 and can extend into the downstream gap 12.

[0083] In some examples, both the driving wheel 3 and the driven wheel 4 are gear structures and made of metal, making both the driving wheel 3 and the driven wheel 4 hard wheels. For example, both the driving wheel 3 and the driven wheel 4 are steel wheels to improve measurement accuracy. When the welding wire 13 passes between the driving wheel 3 and the driven wheel 4, the outer peripheral wall of the driving wheel 3 and the outer peripheral wall of the driven wheel 4 come into contact with the welding wire 13.

[0084] In some examples, the upstream channel 701 includes a first equal-diameter section 7011, a contraction section 7012, a second equal-diameter section 7013, and an expanded upper guide section 7014 arranged sequentially along the direction gradually approaching the meshing area 11. That is, the cross-sectional area of ​​the upstream channel 701 first gradually decreases and then gradually increases. The generatrix of the contraction section 7012 can be an arc or a straight line. The diameter of the first equal-diameter section 7011 is larger than the diameter of the second equal-diameter section 7013. The large diameter of the first equal-diameter section 7011 facilitates the entry of the welding wire into the upstream channel 701. Then, the gradually contracting 7012 gradually positions the welding wire until it enters the second equal-diameter section 7013. Then, the expanded upper guide section 7014 improves the docking accuracy between the upstream channel 701 and the meshing area 11, so that the welding wire can smoothly enter the meshing area 11.

[0085] The downstream channel 801 expands at one end near the meshing area 11 to form a lower guide section 8011 for guiding the welding wire into it. The lower guide section 8011 can improve the docking accuracy between the downstream channel 801 and the meshing area 11, so that the welding wire can smoothly enter the downstream channel 801.

[0086] Regarding the retraction of welding wire 13, the following two options can be selected:

[0087] The first rewinding solution is: Motor 2 is a servo motor. Compared with stepper motors, the price difference of servo motors is not significant, but servo motors are faster and can achieve closed-loop control themselves.

[0088] Motor 2 is used to drive the drive wheel 3 to rotate forward and backward. When the drive wheel 3 rotates forward, it drives the welding wire 13 forward. When the drive wheel 3 rotates backward, it drives the welding wire 13 backward. In other words, the reverse rotation of motor 2 is used to realize electric wire return.

[0089] The second method of rewinding is as follows: Figure 10 As shown, it also includes a linear reciprocating motion unit whose output end can reciprocate in a straight line. The output end of the linear reciprocating motion unit is fixedly connected to the base 1. The linear reciprocating motion unit can be, but is not limited to, a cylinder 15, an electric push rod, or a linear module. Taking the linear reciprocating motion unit using a cylinder 15 as an example, the piston rod of the cylinder 15 is fixedly connected to the base 1. When the piston rod of the cylinder 15 retracts, it drives the base 1 and the wire outlet 5 on it to retract, and the welding wire 13 also retracts accordingly, realizing pneumatic wire return. In contrast, in this wire return scheme, the motor 2 is only responsible for feeding the wire, which can eliminate the error caused by the wire return of the motor 2.

[0090] As an example, a laser welding machine includes the aforementioned wire feeding mechanism with measurable length, as shown in the figure. The laser welding machine has two wire feeding mechanisms that gradually approach each other from top to bottom and are symmetrically arranged, thereby realizing dual-path wire feeding. The laser welding head 17 emits a laser beam 20 vertically downwards. The center extension lines of the wire outlet nozzles 5 of the two wire feeding mechanisms intersect at a point, and this point is located on the center line of the laser beam 20. The laser beam 20 melts and welds the welding wire 13 fed out by the wire outlet nozzle. Of course, the number of wire feeding mechanisms can also be one, three, four, etc., and this embodiment does not limit this.

[0091] In addition, the laser welding machine also includes a body 15, a wire spool 16 rotatably mounted on the body 15 for winding the welding wire 13, a linear reciprocating motion unit for driving the wire feeding mechanism to rise and fall, a transverse movement unit for driving the wire feeding mechanism to move laterally, and a rotation unit 19 for driving the wire feeding mechanism to rotate circumferentially, thereby realizing the position adjustment of the wire feeding nozzle 5.

[0092] The principle behind the above-mentioned welding wire being fed to a wire feeding mechanism with measurable length is as follows:

[0093] The wire spool 16, on which the welding wire 13 is wound, is rotatably mounted on the machine body 15. The welding wire 13 on the wire spool 16 passes through the upstream channel 701, the meshing area 11, the downstream channel 801 and the wire outlet 5 in sequence.

[0094] During wire feeding, motor 2 drives drive wheel 3 to rotate forward, and drive wheel 3 pushes welding wire 13 forward to achieve wire feeding. Since driven wheel 4 rotates by the pull of welding wire 13, as long as driven wheel 4 rotates, welding wire 13 will inevitably move forward. The distance the welding wire 13 moves forward is proportional to the number of rotations of driven wheel 4. That is, by obtaining the number of rotations of driven wheel 4 in real time through encoder 6, the forward distance of welding wire 13 can be known, thereby realizing real-time monitoring of the feeding length of welding wire 13 and achieving precise control of the wire feeding amount of welding wire 13.

[0095] When retracting the wire, if the motor 2 is used to reverse the wire retraction, the motor 2 drives the drive wheel 3 to reverse the wire retraction, and the drive wheel 3 drives the welding wire 13 to retract to achieve wire retraction. The driven wheel 4 rotates as the welding wire 13 retracts. If the cylinder 15 is used to retract the wire, the cylinder 15 drives the base 1 and the wire outlet 5 on it to retract to achieve pneumatic wire retraction.

[0096] The above description, based on the preferred embodiments of this utility model, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A wire feeding mechanism for feeding welding wire of measurable length, characterized in that: include: Base (1); The wire feeding drive assembly has a motor (2), a drive wheel (3) and a driven wheel (4). The motor (2) is mounted on a base (1) and is used to drive the drive wheel (3) to rotate. The drive wheel (3) and the driven wheel (4) are configured such that when the welding wire (13) passes between the drive wheel (3) and the driven wheel (4), the driven wheel (4) presses the welding wire (13) against the drive wheel (3), and the rotation of the drive wheel (3) drives the welding wire (13) to move, and the welding wire (13) pulls the driven wheel (4) to rotate. The wire outlet (5) is set on the base (1). When the drive wheel (3) drives the welding wire (13) forward, the wire outlet (5) delivers the welding wire (13) for welding. And an encoder (6), the shaft of which is connected to the driven wheel (4) for detecting the angular displacement of the driven wheel (4).

2. The wire feeding mechanism with measurable length according to claim 1, characterized in that: The encoder (6) is connected to the control module, and the control module is connected to the alarm device. When the motor (2) drives the drive wheel (3) to rotate, the encoder (6) monitors in real time whether the driven wheel (4) is rotating. When the driven wheel (4) stops rotating, the control module controls the alarm device to sound an alarm.

3. The wire feeding mechanism with measurable length according to claim 1, characterized in that: The driving wheel (3) and the driven wheel (4) are connected by an upstream gap (10), a meshing area (11) and a downstream gap (12) distributed sequentially along the forward direction of the welding wire (13). When the welding wire (13) is in the meshing area (11), it is in contact with both the driving wheel (3) and the driven wheel (4). An upstream guide nozzle (7) and a downstream guide nozzle (8) are fixed on the base (1); The upstream guide nozzle (7) has an upstream channel (701) for guiding the welding wire (13) to move toward the meshing area (11), and one end of the upstream guide nozzle (7) near the meshing area (11) extends into the upstream gap (10); The downstream guide nozzle (8) has a downstream channel (801) for guiding the welding wire (13) to move toward the wire outlet nozzle (5), and one end of the downstream guide nozzle (8) near the meshing area (11) extends into the downstream gap (12); the upstream channel (701) and the downstream channel (801) are coaxially arranged.

4. The wire feeding mechanism with measurable length according to claim 3, characterized in that: The upstream guide nozzle (7) is provided with an upstream contour structure (702) that is passed through by the upstream channel (701) at one end near the meshing area (11). The upstream contour structure (702) extends into the upstream gap (10), and its cross-sectional area gradually decreases along the direction from the upstream gap (10) to the meshing area (11). The downstream guide nozzle (8) is provided with a downstream contour structure (802) that is passed through by the downstream channel (801) at one end near the engagement area (11). The downstream contour structure (802) extends into the downstream gap (12), and its cross-sectional area gradually decreases along the direction from the downstream gap (12) to the engagement area (11).

5. The wire feeding mechanism with measurable length according to claim 3, characterized in that: The wire outlet (5) is fixedly connected to the end of the downstream guide nozzle (8) away from the meshing area (11) and they are in communication with each other; a notch (803) extending to the outer peripheral wall of the downstream guide nozzle (8) is provided on the inner wall of the downstream channel (801), and a cantilever (804) is formed at the notch (803) with one end suspended and the other end connected to the inner wall of the notch (803); A base plate (9) is fixed on the base (1). A through hole (901) is provided on the base plate (9) for the downstream guide nozzle (8) to pass through. The downstream guide nozzle (8) is detachably fixed in the through hole (901). The wire outlet nozzle (5) is inserted in the downstream channel (801). A fastener is detachably installed on the downstream guide nozzle (8). The fastener forces the cantilever (804) to deform into the downstream channel (801) and abut against the outer peripheral wall of the wire outlet nozzle (5).

6. The wire feeding mechanism with measurable length according to claim 5, characterized in that: The downstream guide nozzle (8) includes a first guide tube (805) with a flange (807) protruding radially, a second guide tube (806) inserted in the first guide tube (805) and extending away from the upstream guide nozzle (7), and a flange (808) located between the flange (807) and the base plate (9) to fix the two together.

7. The wire feeding mechanism with measurable length according to claim 1, characterized in that: Both the driving wheel (3) and the driven wheel (4) are gear structures. When the welding wire (13) passes between the driving wheel (3) and the driven wheel (4), the outer peripheral wall of the driving wheel (3) and the outer peripheral wall of the driven wheel (4) come into contact with the welding wire (13).

8. The wire feeding mechanism with measurable length according to claim 3, characterized in that: The upstream channel (701) includes a first equal diameter section (7011), a contraction section (7012), a second equal diameter section (7013) arranged sequentially along the direction gradually approaching the meshing area (11), and an upper guide section (7014) that expands to guide the welding wire (13) into the meshing area (11); The downstream channel (801) expands at one end near the meshing area (11) to form a lower guide section (8011) for guiding the welding wire (13) into it.

9. A laser welding machine, characterized in that: This includes a wire feeding mechanism with measurable length, as described in any one of claims 1-8.

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