Precision steel wire butt welding machine

Abstract

The present application provides a kind of precision steel wire butt welding machine, including base, fixed seat and movable seat are fixed in parallel on base, fixed seat is fixedly connected on base, movable seat is slidably arranged on the top forging guide rail fixed on base, movable seat and the top forging oil cylinder transmission connection of top forging oil cylinder parallel setting is slid along the direction of fixed seat under the drive, a set of clamping electrode is arranged on fixed seat and movable seat, the outside of clamping electrode is provided with feeding mechanism, and a middle position polisher is arranged between clamping electrode, the middle position polisher includes abrasive belt polishing head, abrasive belt can be arranged by the setting of guide structure overall structure, reduce space occupation, avoid the structure of butt welding structure conflict, to realize the integration of polishing structure and butt welding structure, to avoid the secondary influence of polishing end face caused by the operation of extra feeding and clamping, ensure end face neat, to improve the precision and quality of butt welding, with good development prospect.

Description

Technical Field

[0001] This invention relates to the field of butt welding machines, specifically a precision steel wire butt welding machine. Background Technology

[0002] Spring steel wire is a metal wire specially used to manufacture compression springs, tension springs, torsion springs, and special-shaped steel wire parts. It has high tensile strength, high elastic limit, good coiling and fatigue resistance. In the early production process of spring steel wire drawing or in the subsequent processing, welding machines are used to weld the steel wire.

[0003] To improve the welding precision of spring steel wire, the welding surface of the wire needs to be ground smooth before welding to increase the fit of the welding surface and ensure that the welding surface is perpendicular to the direction of force, preventing the wire from bending when subjected to force. The traditional method uses a grinding wheel to grind the wire separately before it enters the clamping electrode. This adds extra feeding and clamping steps, increases working time, and may also cause secondary damage to the end face of the wire, resulting in a poor grinding effect on the cross-section.

[0004] Therefore, a new type of precision wire butt welding machine is needed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a precision wire butt welding machine to solve the problem of end face grinding before wire butt welding.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A precision wire butt welding machine includes a base, on which a fixed seat and a movable seat are fixedly fixed. The fixed seat is fixedly connected to the base, and the movable seat is slidably mounted on an upsetting guide rail fixed to the base. An upsetting cylinder, which is parallel to the movable seat and the upsetting guide rail, is driven by the upsetting cylinder and slides towards the fixed seat. An assembly of clamping electrodes is mounted on the fixed seat and the movable seat. A feeding mechanism is mounted on the outside of the clamping electrodes and fixed to the fixed seat and the movable seat. A center-position grinder is mounted between the clamping electrodes. The center-position grinder includes a telescopic cylinder, a front mounting frame, and a belt grinding head. The telescopic cylinder is positioned between the two clamping electrodes and faces the welding point. A front mounting frame is fixedly connected to the cylinder head, and a belt grinding head is connected to the front end of the front mounting frame.

[0007] As a further aspect of the present invention: the grinding belt trajectory of the belt sander is arranged in an M-shape, the belt sander is rotatably connected to the front mounting bracket, a reversing motor is fixed on the front mounting bracket, and the output shaft of the reversing motor is connected to the belt sander through a transmission wheel set.

[0008] As a further aspect of the present invention: belt drive is used between the transmission wheel sets, and the rotation position of the sanding head on the front mounting bracket is physically limited to restrict the rotation of the sanding head by 90° from the vertical to the horizontal direction.

[0009] As a further embodiment of the present invention: a side guide rail is fixed on the fixed base along the direction parallel to the upsetting guide rail, a side slide is slidably arranged on the side guide rail, a telescopic cylinder is fixed on the side slide, and a side cylinder is provided on the fixed base for transmission connection with the side slide to drive the side slide.

[0010] As a further embodiment of the present invention: the belt abrasive head includes a connecting frame, a connecting shaft, a guide wheel, a drive wheel, and a tension wheel. The connecting frame is U-shaped, and the connecting shaft is fixedly connected to the bottom surface of the U-shaped structure. The connecting frame is rotatably connected to the telescopic cylinder through the connecting shaft. Two sets of guide wheels are symmetrically arranged on both sides of the U-shaped structure, and a tension wheel is provided between the two sets of guide wheels. The tension wheel and the two sets of guide wheels together form an M-shaped arrangement. A drive wheel is provided at the end of the side wall of the U-shaped structure. The drive wheel is connected to the output shaft of the abrasive motor fixed on the outside of the side wall for transmission. The abrasive belt is sequentially passed through the outside of the drive wheel, the outside of the guide wheel, and the inside of the tension wheel.

[0011] As a further embodiment of the present invention: the feeding mechanism includes a feeding base, an arm, a drive wheel, a pressing wheel, and an adjusting cylinder. A feeding motor is fixed on the feeding base, and a drive wheel with a groove on its circumference is connected to the output shaft of the feeding motor. An arm is hinged to the top of the feeding base, and an adjusting cylinder is connected to the feeding base at the non-hinged end of the arm to adjust the hinge angle between the arm and the feeding base. A pressing wheel with the same shape as the drive wheel is provided on the upper side of the drive wheel at a position corresponding to the drive wheel.

[0012] As a further aspect of the present invention: a groove for pressing spring steel wire is provided on the clamping electrode, and the bottom of the groove is set 0.5cm lower than the support point of the spring steel wire at the top of the drive wheel of the feeding mechanism in the vertical direction.

[0013] As a further embodiment of the present invention: a side plate extending below the top of the drive wheel is fixed to the side of the boom, an angle motor is fixed to the side plate, an angle wheel is connected to the output shaft of the angle motor, the angle wheel is set along the vertical feeding direction, when the adjusting cylinder retracts to the point where the drive wheel and the pressing wheel are in contact, the angle wheel is lower than the top of the drive wheel as a whole, and there is also a stop wheel on the feeding base set at a height of 0.5cm higher than the pressing position of the pressing wheel.

[0014] As a further aspect of the present invention: the angle wheel is a rubber-coated wheel with an arc-shaped circumferential surface.

[0015] As a further aspect of the present invention: the drive wheel and the pressing wheel are both rubber-coated wheels, and the abutment wheel is a smooth metal wheel. Beneficial effects

[0016] 1. The present invention includes a center-position grinder between the clamping electrodes. The center-position grinder includes a telescopic cylinder, a front mounting frame, and a belt grinder head. The telescopic cylinder is positioned between the two clamping electrodes and faces the welding point. The front mounting frame is fixedly connected to the cylinder head, and the belt grinder head is connected to the front end of the front mounting frame. By using the belt grinder head between the two clamping electrodes, the end face of the steel wire is ground. Compared with a grinding wheel, the belt grinder can arrange the overall structure through the setting of the guide structure, reduce space occupation, avoid structural resistance to the butt welding structure, and thus realize the integration of the grinding structure and the butt welding structure. This avoids the secondary impact on the ground end face caused by unnecessary feeding and clamping operations, ensures the end face is clean, and improves the precision and quality of butt welding.

[0017] 2. The belt abrasive head of this invention has two sets of guide wheels symmetrically arranged on both sides, with a tension wheel between them. The tension wheel and the two sets of guide wheels together form an M-shaped arrangement. A drive wheel is located at the end of the U-shaped side wall. The drive wheel is connected to the output shaft of a grinding motor fixed on the outside of the side wall for transmission. The abrasive belt passes sequentially through the outside of the drive wheel, the outside of the guide wheel, and the inside of the tension wheel. The belt abrasive head is rotatably connected to the front mounting frame. A reversing motor is fixed on the front mounting frame. The output shaft of the reversing motor is connected to the belt abrasive head through a transmission wheel set. The angle between the M-shaped abrasive belt arrangement at the front end of the abrasive head and the overall abrasive head rotation is utilized. The device can grind the steel wire end face from both sides when in a horizontal state, and simultaneously grind the weld seam of the welded steel wire from both top and bottom sides through the V-angle in the middle of the M-shape when in a vertical state. This removes protruding weld scars caused by surface pressure and ensures the flatness of the welded area. The movable setting of the tension wheel not only facilitates the installation of the grinding belt, but also ensures that the grinding belt is always taut, preventing the grinding belt from loosening and affecting the grinding effect or derailing. In addition, the elastic movement allowance provided by the tension wheel can also achieve interference contact when the V-angle part of the grinding belt contacts the steel wire, so that the V-angle part bends and fits the surface of the steel wire, changing the line contact to surface contact, resulting in a uniform grinding effect.

[0018] 3. In this invention, a feeding motor is fixed on the feeding base. A drive wheel with a grooved circumference is connected to the output shaft of the feeding motor. A stop wheel is provided diagonally above the drive wheel, with its low point higher than the high point of the drive wheel. An arm is hinged to the top of the feeding base. An adjusting cylinder is connected to the feeding base at the non-hinged end of the arm, adjusting the hinge angle between the arm and the feeding base. A pressing wheel with the same shape as the drive wheel is provided on the arm above the drive wheel at a position corresponding to the drive wheel. A side mounting plate extending below the apex of the drive wheel is fixed to the side of the arm. An angle motor is fixed to the side mounting plate, and the output shaft of the angle motor is connected to... An angle wheel is attached, positioned perpendicular to the feeding direction. When the adjusting cylinder retracts to the point where the drive wheel and the pressing wheel are in contact, the angle wheel is lower than the apex of the drive wheel. There is also a stop wheel on the feeding base, positioned 0.5cm above the pressing position of the pressing wheel. That is, when the adjusting cylinder retracts, the pressing wheel and the angle wheel press down, and the steel wire passes between the pressing wheel and the drive wheel, driven by the drive wheel for axial feeding. When the adjusting cylinder extends, the pressing wheel and the angle wheel rise, and the steel wire is clamped between the angle wheel and the stop wheel, driven by the angle wheel for circumferential rotation. This, combined with the vertical position of the belt sander, enables the grinding of the weld. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the welding structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the fixing base portion of the present invention.

[0022] Figure 4 This is a schematic diagram of the movable seat portion of the present invention.

[0023] Figure 5 This is a schematic diagram of the feeding mechanism of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the mid-position grinder of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the belt abrasive head of the present invention.

[0026] Figure 8 This is a schematic diagram of the sanding process using the belt abrasive head of the present invention.

[0027] Figure 1-8Components: 1. Base; 2. Fixed seat; 3. Upsetting guide rail; 4. Movable seat; 5. Upsetting cylinder; 6. Electrode clamping; 7. Feeding mechanism; 71. Feeding base; 72. Arm; 73. Drive wheel; 74. Pressing wheel; 75. Adjusting cylinder; 76. Feeding motor; 77. Side mounting plate; 78. Angle motor; 79. Angle wheel; 710. Abutment wheel; 8. Center-position grinder; 81. Side guide rail; 82. Side cylinder; 83. Side slide; 84. Telescopic cylinder; 85. Front mounting bracket; 86. Reversing motor; 87. Transmission wheel set; 88. Belt grinding head; 881. Connecting frame; 882. Connecting shaft; 883. Guide wheel; 884. Drive wheel; 885. Grinding motor; 886. Tensioning wheel; 887. Grinding belt. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Please see Figures 1-8 , Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the welding structure of the present invention; Figure 3 This is a schematic diagram of the fixing base portion of the present invention; Figure 4 This is a schematic diagram of the movable seat portion of the present invention; Figure 5 This is a schematic diagram of the feeding mechanism of the present invention; Figure 6 This is a schematic diagram of the mid-position grinder structure of the present invention; Figure 7 This is a schematic diagram of the belt abrasive head structure of the present invention; Figure 8 This is a schematic diagram of the sanding process using the belt abrasive head of the present invention.

[0029] This embodiment provides a precision wire butt welding machine, including a base 1, on which a fixed seat 2 and a movable seat 4 are fixedly fixed in parallel. The fixed seat 2 is fixedly connected to the base 1, and the movable seat 4 is slidably mounted on an upsetting guide rail 3 fixed on the base 1. An upsetting cylinder 5, which is parallel to the movable seat 4 and the upsetting guide rail 3, is driven by the upsetting cylinder 5 and slides in the direction toward the fixed seat 2. An assembly clamping electrode 6 is provided on the fixed seat 2 and the movable seat 4. A feeding mechanism 7 is provided on the outside of the clamping electrode 6 and fixed on the fixed seat 2 and the movable seat 4. A center grinder 8 is provided between the clamping electrodes 6. The center grinder 8 includes a telescopic cylinder 84, a front mounting frame 85 and a sanding belt grinding head 88. The telescopic cylinder 84 is located between the two clamping electrodes 6 and faces the welding point. The front mounting frame 85 is fixedly connected to the cylinder head, and the front end of the front mounting frame 85 is connected to the sanding belt grinding head 88. By using a belt grinding head between the two clamped electrodes 6, the end face of the steel wire is ground. Compared with a grinding wheel, the belt grinding head can arrange the overall structure through the setting of the guide structure, reduce space occupation, avoid structural resistance to the butt welding structure, and thus realize the integration of the grinding structure and the butt welding structure. This avoids the secondary impact on the grinding end face caused by unnecessary feeding and clamping operations, ensures the end face is clean, and thus improves the precision and quality of butt welding.

[0030] The belt abrasive head 88 includes a connecting frame 881, a connecting shaft 882, guide wheels 883, a drive wheel 884, and a tension wheel 886. The connecting frame 881 is U-shaped, with the connecting shaft 882 fixedly connected to the bottom surface of the U-shaped structure. The connecting frame 881 is rotatably connected to the telescopic cylinder 84 via the connecting shaft 882. Two sets of guide wheels 883 are symmetrically arranged on both sides of the U-shaped structure, and a tension wheel 886 is arranged between the two sets of guide wheels 883. The tension wheel 886 and the two sets of guide wheels 883 together form an M-shaped arrangement. The drive wheel 884 is located at the end of the side wall of the U-shaped structure. The drive wheel 884 is connected to the output shaft of the abrasive motor 885 fixed on the outer side of the side wall for transmission. The abrasive belt 887 passes sequentially through the outer side of the drive wheel 884, the outer side of the guide wheels 883, and the inner side of the tension wheel 886. The belt abrasive head 88 is rotatably connected to the front mounting frame 85. A reversing motor 86 is fixed on top. The output shaft of the reversing motor 86 is connected to the sanding head 88 via a transmission wheel set 87. By utilizing the M-shaped sanding belt arrangement at the front end of the sanding head and the overall angular rotation of the sanding head, the sanding head can grind the steel wire end face on both sides in a horizontal state. In a vertical state, it can grind the weld seam of the welded steel wire from both the top and bottom sides simultaneously through the V-angle in the middle of the M-shape, removing the protruding weld scars generated by surface pressure and ensuring the flatness of the welded area. The movable setting of the tension wheel 886 not only facilitates the installation of the sanding belt 887, but also ensures that the sanding belt 887 is always taut, preventing the sanding belt 887 from loosening and affecting the sanding effect or derailing. In addition, the elastic movement allowance provided by the tension wheel 886 can also achieve interference contact when the V-angle part of the sanding belt 887 contacts the steel wire, so that the V-angle part bends and fits the surface of the steel wire, changing the line contact to a surface contact, resulting in a uniform sanding effect.

[0031] Specifically, to improve the angular accuracy after reversal, the rotation position of the belt sander head 88 on the front mounting bracket 85 is physically limited, restricting the rotation of the belt sander head 88 by 90° from the vertical to the horizontal direction. The transmission wheel sets 87 adopt belt drive to realize the sliding clutch of the transmission, so that direct overload drive can be used in conjunction with the angle limit to ensure the reversal accuracy and avoid the oblique force caused by grinding out the inclined surface.

[0032] Specifically, in order to precisely control the degree of grinding of the end face of the steel wire, a side guide rail 81 is fixed on the fixed base 2 along the direction of parallel upsetting guide rail 3. A side slide 83 is slidably arranged on the side guide rail 81. A telescopic cylinder 84 is fixed on the side slide 83. A side cylinder 82 is provided on the fixed base 2 and is connected to the side slide 83 for transmission, so as to drive the side slide 83 and realize the movement of the center grinder 8 along the welding direction. This, in conjunction with vision or laser positioning, achieves dynamic contact control between the grinding surfaces on both sides and the end faces of the steel wires on both sides.

[0033] The feeding mechanism 7 includes a feeding base 71, an arm 72, a drive wheel 73, a pressing wheel 74, and an adjusting cylinder 75. A feeding motor 76 is fixed on the feeding base 71. A drive wheel 73 with a grooved circumference is connected to the output shaft of the feeding motor 76. A stop wheel 710 is provided diagonally above the drive wheel 73, with the low point of the stop wheel 710 higher than the high point of the drive wheel 73. The arm 72 is hinged to the top of the feeding base 71. The non-hinged end of the arm 72 is connected to the adjusting cylinder 75 and the feeding base 71. The arm 72 is connected to the feed base 71, and the hinge angle between the arm 72 and the feed base 71 is adjusted. A pressing wheel 74, with the same shape as the drive wheel 73, is located on the upper side of the drive wheel 73 at a position corresponding to the drive wheel 73. A side mounting plate 77 extending below the apex of the drive wheel 73 is fixed to the side of the arm 72. An angle motor 78 is fixed to the side mounting plate 77, and an angle wheel 79 is connected to the output shaft of the angle motor 78. The angle wheel 79 is positioned perpendicular to the feeding direction. When the adjusting cylinder 75 retracts to the position where the drive wheel 73 presses against the feed base 71... When the rollers 74 are in contact, the angle roller 79 is lower than the apex of the drive roller 73. The feeding base 71 also has a stop roller 710 positioned 0.5cm above the pressing position of the pressing roller 74. That is, when the adjusting cylinder 75 retracts, the pressing roller 74 and angle roller 79 press down, and the steel wire passes between the pressing roller 74 and the drive roller 73, driven by the drive roller 73 for axial feeding. When the adjusting cylinder 75 extends, the pressing roller 74 and angle roller 79 rise, and the steel wire is clamped between the angle roller 79 and the stop roller 710. Driven by the angle wheel 79, it rotates circumferentially and, in conjunction with the sanding head 88, grinds the weld seam in a vertical position. The drive wheel 73, the pressure wheel 74, and the angle wheel 79 are all rubber-coated wheels to increase the contact friction with the steel wire. The abutment wheel 710 is a smooth metal wheel, which reduces the frictional resistance of the steel wire's circumferential rotation. Furthermore, the circumferential surface of the angle wheel 79 is arc-shaped, thereby avoiding the micro-angle changes caused by the rotation of the arm 72 along the hinge point and ensuring the effective angle drive of the angle wheel 79 on the steel wire.

[0034] Specifically, the clamping electrode 6 is provided with a pressing groove for pressing the spring steel wire. The bottom of the pressing groove is set 0.5cm lower than the support point of the spring steel wire at the top of the drive wheel 73 of the feeding mechanism 7 in the vertical direction, so as to leave a height margin for the end of the steel wire to hang down and avoid feeding resistance during feeding.

[0035] When implementing the technical solution described in this embodiment, the straightened steel wire is fed between the clamping electrodes 6 by the drive wheel 73 and the pressing wheel 74 of the feeding mechanism 7. After being clamped by the clamping electrodes 6, the position of the belt sander head 88 and the movable seat 4 is adjusted under the visual positioning of the vision device so that the two sides of the belt sander head 88 contact the end faces of the steel wires on both sides, and the end faces of the steel wires are ground flat. After the grinding is completed, the telescopic cylinder 84 connected to the belt sander head 88 drives the belt sander head 88 to retract and rotate its angle, and the steel wires with the two end faces ground flat. The wire is welded under the combined action of the clamping electrode 6 of the fixed seat 2 and the clamping electrode 6 of the movable seat 4 driven by the upsetting cylinder 5 to move laterally. At this time, the rotating belt grinding head 88 is extended under the drive of the telescopic cylinder 84, and the inner V-angle part wraps the weld of the steel wire. At the same time, the adjusting cylinder 75 of the feeding mechanism 7 extends, the pressing wheel 74 and the angle wheel 79 rise, and the steel wire is clamped between the angle wheel 79 and the abutment wheel 710. It is driven by the angle wheel 79 to rotate circumferentially, and the vertical state of the belt grinding head 88 is used to grind the weld.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision steel wire butt welding machine, characterized in that, include: The base (1) has a fixed seat (2) and a movable seat (4) fixedly fixed on it. The fixed seat (2) is fixedly connected to the base (1), and the movable seat (4) is slidably set on the upsetting guide rail (3) fixed on the base (1). The movable seat (4) is connected to the upsetting oil cylinder (5) which is set parallel to the upsetting guide rail (3) and slides towards the fixed seat (2) under the drive of the upsetting oil cylinder (5). A clamping electrode (6) is provided on the fixed seat (2) and the movable seat (4); A mid-position grinder (8) is provided on the outside of the clamping electrode (6) and a feeding mechanism (7) is fixed on the fixed seat (2) and the movable seat (4). A mid-position grinder (8) is provided between the clamping electrodes (6). The mid-position grinder (8) includes a telescopic cylinder (84), a front mounting frame (85) and a belt grinding head (88). The telescopic cylinder (84) is provided between the two clamping electrodes (6) and faces the welding point. A front mounting frame (85) is fixedly connected to the cylinder head. A belt grinding head (88) is connected to the front end of the front mounting frame (85).

2. The precision wire butt welding machine according to claim 1, characterized in that: The grinding belt (887) of the belt grinding head (88) is arranged in an M-shape. The belt grinding head (88) is rotatably connected to the front mounting bracket (85). A reversing motor (86) is fixed on the front mounting bracket (85). The output shaft of the reversing motor (86) is connected to the belt grinding head (88) through a transmission wheel set (87).

3. A precision wire butt welding machine according to claim 2, characterized in that: The transmission wheel sets (87) are driven by belts. The rotation position of the sanding head (88) on the front mounting bracket (85) is physically limited, restricting the rotation of the sanding head (88) from 90° in the vertical to the horizontal direction.

4. A precision wire butt welding machine according to claim 2, characterized in that: A side guide rail (81) is fixed on the fixed base (2) along the direction of the parallel upsetting guide rail (3). A side slide (83) is slidably arranged on the side guide rail (81). The telescopic cylinder (84) is fixed on the side slide (83). A side cylinder (82) is provided on the fixed base (2) and is connected to the side slide (83) for transmission. The side slide (83) is driven.

5. A precision wire butt welding machine according to claim 2, characterized in that: The belt abrasive head (88) includes a connecting frame (881), a connecting shaft (882), guide wheels (883), a drive wheel (884), and a tension wheel (886). The connecting frame (881) is U-shaped, and the connecting shaft (882) is fixedly connected to the bottom surface of the U-shaped structure. The connecting frame (881) is rotatably connected to the telescopic cylinder (84) through the connecting shaft (882). Two sets of guide wheels (883) are symmetrically arranged on both sides of the U-shaped structure. A tensioning wheel (886) is provided between the wheels (883). The tensioning wheel (886) and the two sets of guide wheels (883) together form an M-shaped arrangement. A drive wheel (884) is provided at the end of the side wall of the U-shaped structure. The drive wheel (884) is connected to the output shaft of the grinding motor (885) fixed on the outside of the side wall for transmission. The grinding belt (887) is sequentially passed through the outside of the drive wheel (884), the outside of the guide wheel (883), and the inside of the tensioning wheel (886).

6. A precision wire butt welding machine according to claim 1, characterized in that: The feeding mechanism (7) includes a feeding base (71), an arm (72), a drive wheel (73), a pressing wheel (74), and an adjusting cylinder (75). A feeding motor (76) is fixed on the feeding base (71). A drive wheel (73) with a groove on its circumference is connected to the output shaft of the feeding motor (76). An arm (72) is hinged to the top of the feeding base (71). An adjusting cylinder (75) is connected to the feeding base (71) at the non-hinged end of the arm (72). The hinge angle between the arm (72) and the feeding base (71) is adjusted. A pressing wheel (74) with the same shape as the drive wheel (73) is provided on the upper side of the drive wheel (73) at a position corresponding to the drive wheel (73).

7. A precision wire butt welding machine according to claim 6, characterized in that: The clamping electrode (6) is provided with a pressing groove for pressing the spring steel wire. The bottom of the pressing groove is 0.5cm lower than the support point of the spring steel wire at the top of the drive wheel (73) of the feeding mechanism (7) in the vertical direction.

8. A precision wire butt welding machine according to claim 6, characterized in that: The arm (72) has a side plate (77) that extends below the top of the drive wheel (73) fixed on its side. An angle motor (78) is fixed on the side plate (77). An angle wheel (79) is connected to the output shaft of the angle motor (78). The angle wheel (79) is set along the vertical feeding direction. When the adjusting cylinder (75) retracts to the point where the drive wheel (73) and the pressing wheel (74) are in contact, the angle wheel (79) is lower than the top of the drive wheel (73). The feeding base (71) also has a stop wheel (710) set at a height 0.5cm higher than the pressing position of the pressing wheel (74).

9. A precision wire butt welding machine according to claim 8, characterized in that: The angle wheel (79) is a rubber-coated wheel with an arc-shaped circumference.

10. A precision wire butt welding machine according to claim 8, characterized in that: The drive wheel (73) and the pressing wheel (74) are both rubber-coated wheels, and the abutment wheel (710) is a smooth metal wheel.

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