WO2018133690A1 - 一种送丝机构及焊枪 - Google Patents

一种送丝机构及焊枪 Download PDF

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Publication number
WO2018133690A1
WO2018133690A1 PCT/CN2018/071758 CN2018071758W WO2018133690A1 WO 2018133690 A1 WO2018133690 A1 WO 2018133690A1 CN 2018071758 W CN2018071758 W CN 2018071758W WO 2018133690 A1 WO2018133690 A1 WO 2018133690A1
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WO
WIPO (PCT)
Prior art keywords
wire
feeding mechanism
rotating
thread
wire feeding
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PCT/CN2018/071758
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English (en)
French (fr)
Inventor
袁忠杰
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袁忠杰
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Publication date
Application filed by 袁忠杰 filed Critical 袁忠杰
Publication of WO2018133690A1 publication Critical patent/WO2018133690A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
    • B23K9/1336—Driving means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/24—Features related to electrodes
    • B23K9/28—Supporting devices for electrodes

Definitions

  • the invention belongs to the technical field of wire transportation, and particularly relates to a wire feeding mechanism and a welding torch.
  • the automatic wire feeder is an automatic wire feeding device that can continuously and stably send the wire according to the set parameters under the control of the microcomputer.
  • the automatic wire feeder generally has a control part to provide parameter setting, the driving part is driven by the wire feeding under the control of the control part, and the wire feeding part sends the welding wire to the welding gun position.
  • the automatic wire feeder in the prior art is generally driven by a servo motor, and the spindle power of the servo motor is finally transmitted to the conveying roller through a multi-stage speed reducing mechanism.
  • the speed reducing mechanism is generally a gear set or a synchronous pulley, and the axis of the conveying roller is generally The length of the wire is perpendicular, and during transport, the wire passes between the rolls of the two transfer rolls.
  • the defect of the wire feeder is that in the actual application process, the feed speed of the wire is required to be fast and slow, but the servo motor is provided between the servo motor main shaft and the conveying roller in the prior art, so the servo motor When decelerating or accelerating, the inertia of the speed reduction mechanism will have a large resistance to the private motor, which will cause the speed of the conveying roller to change in response to the speed, which will affect the welding quality.
  • An object of the present invention is to provide a wire feeding mechanism and a welding torch capable of flexibly changing a conveying speed.
  • a wire feeding mechanism comprising at least one rotationally disposed rotating portion, and a driving device for driving the rotation of the rotating portion, the rotating portion being provided on at least one of the rotating surfaces a continuous or intermittent threaded portion, along the direction of the radial direction of the rotating portion, the thread vertices of the threaded portion are parallel to the length of the wire to be conveyed, or gradually approach the center of the wire along the conveying direction of the wire; At least a portion of the threaded portion of the threaded portion is threaded into the wire and threaded with a threaded groove or a pre-formed thread groove formed by the surface of the wire to cause the wire to decelerate forward and backward along its length.
  • a welding gun comprising the wire feeding mechanism, the wire is a welding wire; the wire feeding mechanism is located in a handle of the welding gun; and a buffer cavity connected in series with the welding wire conveying channel of the welding gun is further disposed in the handle of the welding gun,
  • the buffer chamber is in communication with an incoming end of the wire feeding mechanism, and the buffering chamber has an arched inner cavity with a large intermediate end
  • the technical effect of the invention is that the invention utilizes the deceleration mechanism of the thread drive itself to transport the wire, and on the one hand solves the problem of large inertia caused by the complex reduction transmission device and the slow response of the shifting speed, on the other hand, the thread can be raised larger. Traction force prevents the wire from slipping, improves the speed limit feed accuracy, greatly improves the dynamic characteristics and meets the process requirements.
  • FIG. 1 is a perspective cross-sectional view showing a wire feeding mechanism according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic perspective structural view of a wire feeding mechanism according to Embodiment 2 of the present invention.
  • Figure 3 is an axial view of the wire feeding mechanism provided in Example 2 of the present invention.
  • FIG. 4 is a schematic perspective structural view of a wire feeding mechanism according to Embodiment 3 of the present invention.
  • Figure 5 is a perspective view showing the structure of a wire feeding mechanism according to Embodiment 4 of the present invention.
  • FIG. 6 is a schematic perspective structural view of a wire feeding mechanism according to Embodiment 5 of the present invention.
  • Figure 7 is a cross-sectional view of a wire feeding mechanism provided in Example 6 of the present invention.
  • Figure 8 is a view taken along line A-A of Figure 7;
  • Figure 9 is a cross-sectional view of a wire feeding mechanism provided in Example 7 of the present invention.
  • Figure 10 is a side view of a wire feeding mechanism provided in Example 8 of the present invention.
  • Figure 11 is a side view of a wire feeding mechanism provided in Example 9 of the present invention.
  • Figure 12 is a perspective view showing the structure of a wire feeding mechanism according to Embodiment 10 of the present invention.
  • Figure 13 is a perspective view showing the three-dimensional structure of the elastic riser provided in Embodiment 6 of the present invention.
  • Figure 14 is a schematic structural view of a welding torch provided in Embodiment 11 of the present invention.
  • Figure 15 is a front elevational view showing a wire feeding mechanism according to a twelfth embodiment of the present invention.
  • Figure 16 is a perspective view showing the structure of a wire feeding mechanism according to Embodiment 12 of the present invention.
  • Fig. 17 is a perspective view showing the structure of the let-off mechanism and the motor provided in the twelfth embodiment of the present invention.
  • a wire feeding mechanism includes at least one rotating portion 10 and a driving device for driving the rotation of the rotating portion 10.
  • the rotating portion 10 is provided on at least one of the rotating surfaces.
  • the continuous or discontinuous thread portion 11 is viewed along the radial direction of the turning portion 10, and the thread apex connection of the thread portion 11 is parallel to the length of the wire 20 to be conveyed, or is gradually approached in the conveying direction of the wire 20.
  • a wire center at least a portion of the thread of the threaded portion 11 is threaded into the wire 20 and threaded with a threaded groove or a pre-formed thread groove formed by the surface of the wire 20 to cause the wire 20 to extend along its length The direction is decelerated.
  • the invention utilizes the deceleration mechanism of the thread drive itself to transport the wire 20, on the one hand, solves the problem of large inertia caused by the complicated transmission device and slow response of the shifting speed, and on the other hand, the thread can lift a large traction force to prevent the wire 20 from slipping. Improve the speed limit feed accuracy.
  • the elastic unit further includes an elastic force acting on the rotating portion along the radial direction of the rotating portion, and the elastic force is directed to the direction of the wire so that the threaded portion on the rotating portion is elastically pressed against the wire. Due to the process limitation, the diameter of the wire 20 tends to float within a certain range, and the threaded portion 11 of the present invention is in elastic contact with the wire 20, so that the threaded portion 11 can float as the diameter of the wire 20 changes, ensuring the threaded portion 11 The depth of the wire 20 is evenly pressed to ensure uniform force on the wire.
  • the threaded portion 11 in the present invention may be a single thread or a double thread or multiple threads. When double or multiple threads are used, the threads may be evenly spaced along the circumferential direction of the rotating portion 10 so that the wire 20 is looped. The axial forces at each point of the face are balanced.
  • the center of rotation of the turning portion 10 is provided with a through hole 12 which constitutes a passage through which the circular section wire 20 passes, the threaded portion 11 It is an internal thread provided on the wall of the through hole 12, and the small diameter of the threaded portion 11 is smaller than the diameter of the circular section wire 20, and the large diameter of the threaded portion 11 is greater than or equal to the diameter of the circular section wire 20.
  • the rotating portion 10 is a main shaft of the motor, and the through hole 12 is disposed through the main shaft along the axis of the main shaft.
  • the threaded portion 11 is disposed at one end of the through hole 12, that is, near the piercing end of the wire 20.
  • One end of the through hole 12, that is, one end through which the wire 20 is inserted, is provided with a tapered hole portion 13 for guiding the wire 20 into the threaded portion 11.
  • the rotating portion 10 is three circumferentially spaced apart along the wire 20, and the rotating portion 10 has a cylindrical outer annular surface, and the wire 20 is interposed between the rotating portions 10.
  • the threaded portion 11 is an external thread provided on the outer circumferential surface of the rotating portion 10, and the respective rotating portions 10 have the same rotational direction and the screw portions 11 have the same rotational direction.
  • a driven gear 15 is respectively disposed on the rotating shaft of the rotating portion 10, and each of the driven gears 15 simultaneously meshes with a driving gear 16 interposed between the driven gears 15, the driving gear 16 and the wire 20 Coaxially disposed, and the center of the master-slave gear is provided with a through hole through which the wire 20 passes.
  • At least one of the swivels 10 is radially reciprocated along the wire 20 such that the threaded portion 11 on the swivel portion 10 can engage or disengage from the surface of the wire 20.
  • the rotating shaft of each rotating portion 10 is mounted on the elastic bearing seat, that is, the bearing housing is subjected to an elastic force directed radially to the wire 20 along the rotating portion 10, and the elastic force is provided by the elastic unit, the elastic unit It may be a compression spring, one end of the compression spring abuts on the side of the bearing seat opposite to the wire 20, and the other end abuts on a fixed component, in addition, the elastic unit can also adopt the prior art.
  • Other commonly used structural forms can be selected by those skilled in the art according to actual needs, as long as the elastic contact between the threaded portion and the wire can be achieved.
  • the guide groove 14 is fixedly disposed.
  • the longitudinal direction of the guide groove 14 is parallel to the axis of the rotary portion 10.
  • a part of the outer wall of the wire 20 is attached to the inner wall of the guide groove 14 to form a sliding relationship.
  • the rotating portion 10 has a cylindrical outer annular surface
  • the threaded portion 11 is an external thread provided on the outer annular surface of the rotating portion 10, and the threaded portion 11 and the outer wall of the wire 20 exposed to the outside of the guiding groove 14 Occlusal.
  • the elastic unit can be provided with reference to the second embodiment.
  • the wire 20 has a flat rectangular cross section, and the guiding groove 14 is a U-shaped groove.
  • One side of the wire 20 has a wide side and a groove bottom of the guiding groove 14.
  • the turning portion 10 is disposed opposite to the notch of the guide groove 14, and the threaded portion 11 on the turning portion 10 is engaged with the wide side of the other side of the wire 20.
  • the elastic unit can also be provided with reference to the second embodiment.
  • the center of rotation of the turning portion 10 is provided with a through hole 12, which constitutes a passage through which the circular section wire 20 passes, and the threaded portion 11 is disposed in the hole wall of the through hole 12.
  • the small diameter of the threaded portion 11 is smaller than the diameter of the circular section wire 20, and the large diameter of the threaded portion 11 is larger than the diameter of the circular section wire 20.
  • the rotating portion 10 in the embodiment is a rotating shaft, and the center of the rotating shaft is provided with a through hole 12 .
  • the threaded portion 11 is disposed at one end of the through hole 12 , and the rotating shaft of the end is parallel to the axis of the rotating shaft.
  • the first expansion and contraction joint 102 is provided with at least two along the circumferential direction of the rotating shaft, and the first expansion and contraction joint 102 makes the end rotation shaft have a certain elasticity, thereby making the through hole 12
  • the orifice can be expanded and contracted within a certain range, and the outer ring surface of the end shaft is provided with a tapered thread 101, and the tapered thread 101 is provided with an elastic expansion sleeve 17, and the inner annular surface of the elastic expansion sleeve 17 is provided with a cone
  • the matching thread of the surface thread 101 is as shown in FIG.
  • the elastic expansion sleeve 17 is provided with a second expansion and contraction slit 171 capable of causing the elastic expansion sleeve 17 to be radially expanded and contracted, and the elastic expansion sleeve 171 constitutes the elasticity.
  • the opening of the through hole 12 of the end shaft can be contracted, so that the threaded portion 11 gradually approaches the center of the wire along the conveying direction of the wire 20, so as to facilitate the end of the wire 20 Import.
  • the embodiment comprises two rotating parts 10 and one light rod 18, three of which are evenly spaced along the circumferential direction of the wire 20, the wire 20 is sandwiched between the three to the nip, and the polished rod 18 is fixed.
  • the rod mainly serves to support the wire 20.
  • the driving method of the two turning portions 10 in this embodiment can be performed by referring to the driving method of the second embodiment.
  • the elastic unit can also be provided with reference to the second embodiment.
  • the thread apex connection of the threaded portion 11 gradually approaches the center of the wire 20 along the conveying direction of the wire 20, which is realized by threading.
  • the portion 11 is disposed on the conical surface, and the axis of the revolving portion 10 is parallel to the conveying direction of the wire 20.
  • the thread vertices of the threaded portion 11 gradually approach the center of the wire along the conveying direction of the wire 20 as viewed in the radial direction of the turning portion 10, but this embodiment and the embodiment
  • the difference between 8 is that the specific implementation is to tilt the axis of the turning portion 10, and the threaded portion 11 can be directly disposed on the cylindrical surface.
  • An advantage of this embodiment is that the threading portion 11 is processed in a simple manner.
  • the driving method of this embodiment can be realized by referring to the driving method of Embodiment 2 and supplemented by a universal joint, that is, a universal joint is arranged on the rotating shaft between the rotating portion 10 and the gear 15, and the axis of each gear 15 can still be The conveying direction of the wire 20 is kept parallel while ensuring that the axis of the turning portion 10 can be adjusted over a range of angles.
  • the turning portion 10 is provided along the length of the wire 20, and the rotation directions of the front and rear rotating portions 10 are opposite, and the screw portions 11 are reversed.
  • a welding torch includes the wire feeding mechanism, the wire 20 is a welding wire; and the wire feeding mechanism is located in the handle 30 of the welding torch.
  • the handle 30 of the welding torch is further provided with a buffer chamber 32 connected in series with the wire feeding passage of the welding gun.
  • the buffer chamber 32 communicates with the incoming end of the wire feeding mechanism, and the buffering chamber has a small arch shape at the middle and the large ends. Inner cavity.
  • the driving device is the motor 31, and the rotating portion 10 is the main shaft of the motor 31. Since the entire wire feeding mechanism can be made small in size, the wire feeding mechanism can be easily integrated into the torch handle 30 by industrial design means. .
  • the embodiment includes a turning portion 10.
  • the center of the turning portion 10 is provided with a through hole.
  • the threaded portion 11 is disposed on the inner ring surface of the through hole, and the wire of the rotating portion 10 is threaded.
  • the outlet end is provided with a constricting slit 102 parallel to the axis of the rotating portion 10 and penetrating through the inner and outer annular surfaces of the rotating portion 10; a taper surface portion 103 is provided on the outer ring surface of the thread passing end of the rotating portion 10, and the rotating portion 10 is provided There is a compression spring 19, and a threaded section 104 is further disposed on the outer ring surface of the rotating portion 10.
  • the threaded section 104 is provided with a nut 105.
  • the two ends of the compression spring 19 abut against the nut 105 and the tapered surface 103, respectively.
  • the wire piercing end of the turning portion 10 can change the amount of contraction under the action of the compression spring 19 and the tapered surface 103, thereby changing the pressure between the threaded portion 11 and the wire 20.
  • the turning portion 10 in this embodiment is coaxially connected to the hollow motor main shaft 311, and the wire 20 directly passes through the motor main shaft 311 and enters the rotating portion 10.

Abstract

一种送丝机构及焊枪，包括回转部(10)，以及用于驱动回转部(10)旋转的驱动装置，该回转部(10)上设有连续或间断式的螺纹部(11)；螺纹部(11)的至少部分螺纹牙旋压入线丝(20)内并与线丝(20)表面旋压产生的螺纹槽或预制的螺纹槽构成螺纹传动配合，使线丝(20)沿自身长度方向减速进退。

Description

一种送丝机构及焊枪 技术领域
本发明属于线丝输送技术领域，具体涉及一种送丝机构及焊枪。
背景技术
自动送丝机是在微电脑控制下，可以根据设定的参数连续稳定的送出焊丝的自动化送丝装置。自动送丝机一般有控制部分提供参数设置，驱动部分在在控制部分的控制下进行送丝驱动，送丝嘴部分将焊丝送到焊枪位置。现有技术中的自动送丝机一般是由伺服电机驱动，伺服电机的主轴动力通过多级减速机构最终传递至输送辊，该减速机构一般为齿轮组或同步带轮，输送辊的轴线一般与焊丝的长度方向垂直，输送时，焊丝从两个输送辊的辊面之间穿过。这种送丝机的缺陷在于：在实际应用过程中，往往要求焊丝的进给速度时快时慢，但由于现有技术中的伺服电机主轴与输送辊之间设有减速机构，因此伺服电机在减速或加速时，减速机构的惯性都会对私服电机产生较大阻力，这会导致输送辊的转速变化响应速度延迟，从而影响焊接质量。另外，现有技术中还存在一种直接由电机驱动输送辊而不经过减速机构的送丝装置，该送丝装置虽然响应速度较快，但由于没有减速机构，所以输送辊的输出扭矩较小，不足以为焊丝提供进给所需牵引力，输送稳定性较差，实用性不强，只在某些特殊要求的场合，作为送丝的辅助工作。
发明内容
本发明的目的是提供一种能够灵活变换传送速度的送丝机构及焊枪。
为实现上述目的，本发明提供了以下技术方案：一种送丝机构，包括至少 一个转动设置的回转部，以及用于驱动回转部旋转的驱动装置，该回转部的至少一个回转面上设有连续或间断式的螺纹部，沿回转部的径线方向看，螺纹部的各螺纹牙顶点连线与待输送的线丝的长度方形平行，或沿线丝的输送方向逐渐靠近线丝中心；所述螺纹部的至少部分螺纹牙旋压入线丝内并与线丝表面旋压产生的螺纹槽或预制的螺纹槽构成螺纹传动配合，使线丝沿自身长度方向减速进退。
一种焊枪，包含所述的送丝机构，所述线丝为焊丝；所述送丝机构位于焊枪的手柄内；所述焊枪的手柄内还设有与焊枪的焊丝输送通道串联的缓冲腔，所述缓冲腔与送丝机构的进线端连通，所述缓冲腔具有中间大两端小的拱形内腔
本发明的技术效果在于：本发明利用螺纹传动自身的减速机制来输送线丝，一方面解决了复杂减速传动装置带来的惯性大，变速响应迟缓的问题，另一方面螺纹能够提较大的牵引力，防止线丝打滑，提高限速进给精度，极大的改善了动态特性，满足工艺要求。
附图说明
图1是本发明的实施例1所提供的送丝机构的立体剖切结构示意图；
图2是本发明的实施例2所提供的送丝机构的立体结构示意图；
图3是本发明的实施例2所提供的送丝机构的轴向视图；
图4是本发明的实施例3所提供的送丝机构的立体结构示意图；
图5是本发明的实施例4所提供的送丝机构的立体结构示意图；
图6是本发明的实施例5所提供的送丝机构的立体结构示意图；
图7是本发明的实施例6所提供的送丝机构的剖视图；
图8是图7的A-A向视图；
图9是本发明的实施例7所提供的送丝机构的截面图；
图10是本发明的实施例8所提供的送丝机构的侧视图；
图11是本发明的实施例9所提供的送丝机构的侧视图；
图12是本发明的实施例10所提供的送丝机构的立体结构示意图；
图13是本发明的实施例6所提供的弹性涨套立体结构示意图；
图14是本发明的实施例11所提供的焊枪的结构示意图；
图15是本发明的实施例12所提供的送丝机构的主视图；
图16是本发明的实施例12所提供的送丝机构的立体结构示意图；
图17是本发明的实施例12所提供的送死机构与电机装配后的立体结构示意图。
具体实施方式
以下结合附图对本发明进行详细的描述。
如图1-13所示，1.一种送丝机构，包括至少一个转动设置的回转部10，以及用于驱动回转部10旋转的驱动装置，该回转部10的至少一个回转面上设有连续或间断式的螺纹部11，沿回转部10的径线方向看，螺纹部11的各螺纹牙顶点连线与待输送的线丝20的长度方形平行，或沿线丝20的输送方向逐渐靠近线丝中心；所述螺纹部11的至少部分螺纹牙旋压入线丝20内并与线丝20表面旋压产生的螺纹槽或预制的螺纹槽构成螺纹传动配合，使线丝20沿自身长度方向减速进给。本发明利用螺纹传动自身的减速机制来输送线丝20，一方面解决了复杂传动装置带来的惯性大，变速响应迟缓的问题，另一方面螺纹能够提较大的牵引力，防止线丝20打滑，提高限速进给精度。
还包括弹性单元，该弹性单元的弹力沿回转部径向作用于回转部，且该弹力指向线丝所在方向，使回转部上的螺纹部弹性压靠在线丝上。由于工艺限制，线丝20的直径往往会在一定范围内浮动，本发明的螺纹部11与线丝20弹性接触，能够使螺纹部11随着线丝20的直径变化而浮动，确保螺纹部11压入线丝20的深度均匀，进而确保线丝受力均匀。
本发明中的螺纹部11可以是单螺纹，也可以是双螺纹或多螺纹，当采用双螺纹或多螺纹时，各螺纹可以沿回转部10的圆周方向均匀间隔布置，以便使线丝20环面各点所受轴向力保持平衡。
实施例1
如图1所示，作为本发明的优选实施例，所述回转部10的回转中心设有通孔12，该通孔12构成供圆形截面线丝20穿过的通道，所述螺纹部11是设置在通孔12孔壁上的内螺纹，该螺纹部11的小径小于圆形截面线丝20的直径，该螺纹部11的大径大于或等于圆形截面线丝20的直径。所述回转部10为电机的主轴，所述通孔12沿主轴的轴心贯穿主轴设置，所述螺纹部11设置在通孔12的一端即靠近线丝20穿出端。所述通孔12的一端即线丝20穿入的一端设有用于引导线丝20进入螺纹部11内的锥孔部13。
实施例2
如图2、3所示，所述回转部10为三个沿线丝20周向平行间隔布置，且回转部10具有圆柱形外环面，所述线丝20夹设在各回转部10之间，所述螺纹部11是设置在回转部10外环面上的外螺纹，所述各回转部10旋转方向相同、螺纹部11旋向相同。回转部10的转轴上分别设有一从动齿轮15，各从动齿轮15同时与一个主动齿轮16啮合，所述主动齿轮16夹设在各从动齿轮15之间，主 动齿轮16与线丝20同轴设置，且主从齿轮中心设有供线丝20穿过的通孔。至少其中一个回转部10沿线丝20径向往复运动设置，使该回转部10上的螺纹部11能够与线丝20表面咬合或分离。另外，该实施例中，各回转部10的转轴安装在弹性轴承座上，即：轴承座受到沿回转部10径向指向线丝20的弹力，该弹力由所述弹性单元提供，该弹性单元可以是压簧，压簧的一端抵靠在轴承座上与线丝20相背的一侧，另一端抵靠在一个固定部件上即可，除此之外，弹性单元还可以采用现有技术中的其它常用的结构形式，本领域技术人员可根据实际需求进行选择，只要能够实现螺纹部与线丝的弹性接触即可。
实施例3
如图4所示，还包括固定设置的导向槽14，所述导向槽14的长度方向与回转部10的轴线平行，所述线丝20的部分外壁与导向槽14内壁贴合并与之构成滑动配合，所述回转部10具有圆柱形外环面，所述螺纹部11是设置在回转部10外环面上的外螺纹，所述螺纹部11与暴露在导向槽14外部的线丝20外壁咬合。另外，本实施例可以参照实施例2设置弹性单元。
实施例4
如图5所示，所述线丝20的截面为扁平的矩形，所述导向槽14为U型槽，所述线丝20的其中一侧宽边与导向槽14的槽底相贴合，所述回转部10与导向槽14的槽口相对设置，且回转部10上的螺纹部11与线丝20的另一侧宽边咬合。本实施例也可以参照实施例2设置弹性单元。
实施例5
如图6所示，所述回转部10的回转中心设有通孔12，该通孔12构成供圆形截面线丝20穿过的通道，所述螺纹部11是设置在通孔12孔壁上的间断式内 螺纹，该螺纹部11的小径小于圆形截面线丝20的直径，该螺纹部11的大径大于圆形截面线丝20的直径。
实施例6
如图7、8所示，本实施例中的回转部10为一根转轴，转轴中心设有通孔12，螺纹部11设置在通孔12的一端，该端的转轴上开设有平行于转轴轴线并贯通转轴内外环面的第一涨缩缝102，第一涨缩缝102沿转轴圆周方向设有至少两个，该第一涨缩缝102使该端转轴具有一定弹性，进而使通孔12的孔口能够在一定范围内涨缩，该端转轴的外环面上设有锥面螺纹101，锥面螺纹101上套装有一弹性涨套17，弹性涨套17的内环面设有与锥面螺纹101相匹配的螺纹，如图13所示，弹性涨套17上开设有能够使弹性涨套17沿径向涨缩的第二涨缩缝171，该弹性涨套171即构成所述弹性单元，同时，当弹性涨套17旋紧时，能够使该端转轴的通孔12孔口收缩，进而使螺纹部11沿线丝20的输送方向逐渐靠近线丝中心，以便于线丝20端部的导入。
实施例7
如图9所示，本实施例包含两个回转部10和一根光杆18，三者沿线丝20圆周方向均匀间隔布置，线丝20夹设在三至之间的夹缝中，光杆18为固定杆，主要起到扶持线丝20的作用。本实施例中的两个回转部10的驱动方式可参照实施例2的驱动方式进行。本实施例也可以参照实施例2设置弹性单元。
实施例8
如图10所示，本实施例中，沿回转部10的径线方向看，螺纹部11的各螺纹牙顶点连线沿线丝20的输送方向逐渐靠近线丝20中心，其实现方式是将螺纹部11设置在圆锥面上，而回转部10的轴线是平行于线丝20输送方向的，该 实施例的优势在于，驱动方式简单，可以直接采用实施例2所示的驱动方式来驱动各个回转部。
实施例9
如图11所示，本实施例中，沿回转部10的径线方向看，螺纹部11的各螺纹牙顶点连线沿线丝20的输送方向逐渐靠近线丝中心，但该实施例与实施例8的区别在于，其具体实现方式是将回转部10的轴线倾斜，而螺纹部11可以直接设置在圆柱面上。该实施例的优势在于螺纹部11的加工方式简单。该实施例的驱动方式可以参照实施例2的驱动方式并辅以万向节来实现，即在回转部10与齿轮15之间的转轴上设置一万向节，各齿轮15的轴线依然可以与线丝20的输送方向保持平行，同时又能确保回转部10的轴线可以在一定角度范围内调节。
实施例10
如图12所示，本实施例中，回转部10沿线丝20长度设有两个，且前后两回转部10的旋转方向相反、螺纹部11旋向相反。该实施例的优势在于：由于前后两回转部10作用于线丝20的扭力能够相互抵消，因此在输送抗扭强度较弱的线丝20时，能够避免丝线20扭曲。
实施例11
如图14所示，一种焊枪，包含所述的送丝机构，所述线丝20为焊丝；所述送丝机构位于焊枪的手柄30内。所述焊枪的手柄30内还设有与焊枪的焊丝输送通道串联的缓冲腔32，所述缓冲腔32与送丝机构的进线端连通，所述缓冲腔具有中间大两端小的拱形内腔。该实施例中，驱动装置为电机31，回转部10为电机31的主轴，由于整个送丝机构体积可以做的很小，因此可以轻松的通过工业设计手段将送丝机构集成在焊枪手柄30内。在本发明的启示下，本领域技 术人员很容易采用工业设计手段将电机集成在焊枪手柄30内，该部分技术内容不属于本发明的设计重点，因此焊枪手柄30的内部结构不再详细赘述。由于工艺需求，焊丝在输送过程中并非是一味的向前进给，实际上焊丝在输送过程中还需要间歇性的向后收回，本发明在焊枪手柄30上设置的缓冲腔32能够减小送丝管内的回丝阻力，提高回丝响应速度。
实施例12
如图15、16、17所示，本实施例包括一个回转部10，回转部10中心设有通孔，螺纹部11设置在该通孔的内环面上，该回转部10的线丝穿出端设有平行于回转部10轴线并贯通回转部10内、外环面的涨缩缝102；回转部10的丝线穿出端的外环面上设有一锥面段103，回转部10上套装有一压簧19，回转部10外环面上还设有一螺纹段104，该螺纹段104上设置有一螺母105，所述压簧19两端分别抵靠在螺母105和所述锥面103上，当拧动螺母105时，回转部10的线丝穿出端能够在压簧19和锥面103的作用下改变收缩量，从而改变螺纹部11与线丝20之间的压力。本实施例中的回转部10与空心的电机主轴311同轴连接，线丝20直接中电机主轴311中穿过，并进入该回转部10内。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种送丝机构，其特征在于：包括至少一个转动设置的回转部(10)，以及用于驱动回转部(10)旋转的驱动装置，该回转部(10)的至少一个回转面上设有连续或间断式的螺纹部(11)，沿回转部的径线方向看，螺纹部(11)的各螺纹牙顶点连线与待输送的线丝(20)的长度方形平行，或沿线丝(20)的输送方向逐渐靠近线丝(20)中心；所述螺纹部(11)的至少部分螺纹牙旋压入线丝(20)内并与线丝(20)表面旋压产生的螺纹槽或预制的螺纹槽构成螺纹传动配合，使线丝(20)沿自身长度方向减速进退。
  2. 根据权利要求1所述的送丝机构，其特征在于：还包括弹性单元，该弹性单元的弹力沿回转部(10)径向作用于回转部(10)，且该弹力指向线丝(20)所在方向，使回转部(10)上的螺纹部(11)弹性压靠在线丝(20)上。
  3. 根据权利要求2所述的送丝机构，其特征在于：所述回转部(10)的回转中心设有通孔(12)，该通孔(12)构成供圆形截面线丝(20)穿过的通道，所述螺纹部(11)是设置在通孔(12)孔壁上的内螺纹，该螺纹部(11)的小径小于圆形截面线丝(20)的直径，该螺纹部(11)的大径大于圆形截面线丝(20)的直径。
  4. 根据权利要求1所述的送丝机构，其特征在于：所述回转部(10)为至少三个沿线丝(20)周向平行间隔布置，且回转部(10)具有圆柱形外环面，所述线丝(20)夹设在各回转部(10)之间，所述螺纹部(11)是设置在回转部(10)外环面上的外螺纹，所述各回转部(10)旋转方向相同、螺纹部(11)旋向相同，或旋转方向相反、螺纹旋向相反。
  5. 根据权利要求1所述的送丝机构，其特征在于：还包括固定设置的具有光滑表面的引导部，所述线丝(20)夹设在引导部的光滑表面与至少一个回转部 (10)之间。
  6. 根据权利要求1所述的送丝机构，其特征在于：所述回转部(10)沿线丝(20)长度设有至少两个，且前后相邻的两回转部(10)的旋转方向相反、螺纹部(11)旋向相反。
  7. 根据权利要求3所述的送丝机构，其特征在于：所述通孔(12)的一端即线丝(20)穿入的一端设有用于引导线丝(20)进入螺纹部(11)内的锥孔部(13)。
  8. 根据权利要求4所述的送丝机构，其特征在于：回转部(10)的转轴上分别设有一从动齿轮(15)，各从动齿轮(15)同时与一个主动齿轮(16)啮合，所述主动齿轮(16)夹设在各从动齿轮(15)之间，主动齿轮(16)与线丝(20)同轴设置，且主从齿轮中心设有供线丝(20)穿过的通孔。
  9. 根据权利要求8所述的送丝机构，其特征在于：至少其中一个回转部(10)沿线丝(20)径向往复运动设置，使该回转部(10)上的螺纹部(11)能够与线丝(20)表面咬合或分离。
  10. 一种焊枪，其特征在于：包含权利要求1至9任意一项所述的送丝机构，所述线丝(20)为焊丝；所述送丝机构位于焊枪的手柄(30)内；所述焊枪的手柄(30)内还设有与焊枪的焊丝输送通道串联的缓冲腔(32)，所述缓冲腔(32)与送丝机构的进线端连通，所述缓冲腔(32)具有中间大两端小的拱形内腔。
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