Wire feeder driven by low-inertia motor

Abstract

The utility model relates to the technical field of welding equipment, in particular to a wire feeder driven by a low-inertia motor, aims to solve the technical problem of overcoming the defects of wire feeding driving in the prior art, and is mainly realized by the following technical scheme: the wire feeder driven by the low-inertia motor comprises a wire feeder, comprising a machine shell, a wire feeding plate frame, a wire feeding structure and a driving structure, the driving structure comprises a driving motor and an output shaft body, the driving motor comprises a motor base body, a motor shaft, a transmission cylinder and a gear set, the motor base body comprises an outer shell, an end cover and a motor plate frame, and an armature piece is further installed between the motor plate frame and the end cover; a clamping device is further arranged between the wire feeding plate frame and the wire feeding structure, the clamping device comprises a downward pressing clamping part and a contraction clamping part which are arranged side by side, a low-inertia motor is used for driving, under the condition that the wire feeding power and efficiency are not changed, the control accuracy can be improved, the dynamic response is faster, and the clamping device is matched to avoid the adverse effect caused by excessive wire feeding.

Description

Technical Field

[0001] The utility model relates to the technical field of welding equipment, in particular to a wire feeder driven by a low-inertia motor. Background Art

[0002] The wire feeder is a welding machine that is widely used in welding technology. It is mainly composed of a reduction mechanism with a fixed reduction ratio, a wire feeding mechanism and a motor. The motor cooperates with the reduction mechanism to drive the wire feeding mechanism, and the wire feeding mechanism is connected to the welding gun joint to feed the welding wire into the welding gun.

[0003] In the existing technology, the wire feeding structure can automatically adjust according to the tightness of the welding wire, and the overall movement of the wire feeding structure is controlled by a high-driving force motor, so that the welding wire runs smoothly. However, the high-driving force motor lacks wire feeding accuracy. When the motor stops during control, it will feed more wire due to inertia, affecting the welding quality; or in order to consider the wire feeding accuracy, the motor driving force is reduced, but the overall wire feeding is not convenient enough, affecting the welding efficiency. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the wire feeding drive in the prior art, thereby providing a wire feeding machine driven by a low inertia motor.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] The transmission mechanism is connected with the gear train of claim 1, wherein the transmission mechanism has a first end located on the side of the driving mechanism and a second end on the driving mechanism.

[0007] By adopting the above technical solution, the drive motor has its own deceleration structure and the rotor size is small, so the drive motor can be assembled more conveniently and the dynamic response is fast during use. The installation of the motor base and the motor shaft, transmission cylinder and gear set can be easily matched and matched to achieve the best meshing state, so that it is easy to control the movement state, facilitate subsequent operation accuracy and ensure product quality, and make subsequent maintenance and replacement of parts more convenient; the clamping device cooperates with the drive motor action, and does not affect the wire feeding operation when the drive motor starts. After the drive motor stops, the welding wire is clamped by pressing down and contracting to avoid excess wire feeding affecting the welding quality and ensure the welding effect.

[0008] Furthermore, the gear set includes a first main transmission gear, a first auxiliary transmission gear, a second main transmission gear and a second auxiliary transmission gear. The first main transmission gear and the first auxiliary transmission gear are meshed with each other, the second main transmission gear and the second auxiliary transmission gear are meshed with each other, the first main transmission gear is coaxial with the motor shaft, the first auxiliary transmission gear and the second main transmission gear are both coaxial with the transmission cylinder, the second auxiliary transmission gear is coaxial with the output shaft, and a rotating seat is extended in the motor base body corresponding to the motor shaft, the transmission cylinder and the output shaft.

[0009] By adopting the above technical solution, the rotation of the motor shaft drives the first main transmission gear to rotate, the first main transmission gear and the first auxiliary transmission gear are engaged with each other, and the first auxiliary transmission gear and the second main transmission gear are coaxial. Therefore, after the motion is transmitted, the second auxiliary transmission gear engaged with the second main transmission gear is driven to rotate, and finally the output shaft extending out of the motor base body is rotated, thereby realizing the operation of the motor.

[0010] Furthermore, the motor base includes an outer shell, an end cover and a motor disc frame. The motor disc frame is fixed to the outer shell after being clamped with the end cover. A rotating seat for mounting the motor shaft extends from the center of a circle of one side of the motor disc frame close to the outer shell. An armature plate is also installed between the motor disc frame and the end cover. A rotor slot for accommodating the armature plate is opened in the side of the end cover close to the motor disc frame, and a positioning groove corresponding to the armature plate is also provided on the motor disc frame.

[0011] By adopting the above technical solution, a small-sized rotor-armature piece is installed between the motor disc frame and the end cover, thereby turning the drive motor into a low-inertia motor. It has the characteristics of fast dynamic response and improved control accuracy while keeping the wire feeding power and efficiency unchanged. It is conducive to accurately controlling the wire feeding amount, thereby ensuring the quality of subsequent wire feeding welding. The setting of the positioning groove and the rotor slot also facilitates the installation and matching of the armature piece and facilitates positioning processing.

[0012] Furthermore, the motor base is fixed in the casing by bolts, a bearing seat is extended from the bottom of the casing corresponding to the motor base, and a support frame is also provided at the connection between the output shaft and the wire feeding structure. The support frame is fixed in the casing and is located on the side of the motor base close to the wire feeding structure, and a rotating bearing coaxial with the output shaft is installed in the support frame.

[0013] By adopting the above technical solution, the support frame cooperates with the rotating bearing to support the output shaft, thereby increasing the supporting force of the output shaft while also limiting it, allowing the output shaft to rotate smoothly and ensuring the coaxial movement of the output shaft and the wire feeding structure.

[0014] Furthermore, the clamping device includes a downward clamping and a contraction clamping arranged in parallel, and the downward clamping and the contraction clamping are both installed on a clamping frame, and the clamping frame is movably installed on the side of the casing. Two mounting holes are respectively provided at the top and bottom of the clamping frame, and two groups of waist-shaped mounting grooves are provided on the side of the casing corresponding to the mounting holes. The clamping frame is fixed to the casing by bolts.

[0015] By adopting the above technical solution, the downward clamping and contraction clamping are coordinated to clamp the welding wire after the driving motor stops, which can start to clamp the welding wire in time, avoid excessive wire feeding, and achieve precise control of wire feeding; the clamping frame drives the clamping device to move as a whole to match the wire feeding structure, reducing bending during wire feeding and improving the quality of the welding wire.

[0016] Furthermore, the downward clamping includes a guide wheel, a downward pressure block and a downward pressure drive, the guide wheel is positioned and rotatably installed on the clamping frame, the axial direction of the guide wheel is perpendicular to the wire feeding direction, a guide groove is provided on the middle ring of the outer side of the guide wheel, the downward pressure block is controlled by the downward pressure drive to slide vertically above the guide wheel, and a downward pressure card is extended from the bottom of the downward pressure block corresponding to the guide groove, the downward pressure drive includes two magnetic blocks and a driving frame, the magnetic blocks are arranged at the top of the driving frame and the top of the downward pressure block, the downward pressure block is movably arranged in the driving frame, and the magnetic block is electrically connected to the driving motor.

[0017] By adopting the above technical solution, the magnetic block is electrically connected to the drive motor. After the drive motor is started, the two magnetic blocks are magnetically attracted to drive the lower pressure block to move upward without affecting the welding wire feeding. After the drive motor is turned off, the lower pressure block moves downward under the action of gravity and engages with the guide groove through the lower pressure card, pressing the welding wire to prevent the welding wire from continuing to be fed.

[0018] Furthermore, a shrinkage clamp is provided at one end of the downward clamping structure close to the wire feeding structure, and the shrinkage clamp includes a hollow guide tube and a plurality of shrinkage plates. The axial direction of the guide tube is arranged along the wire feeding direction and is installed transversely with the clamping frame. The shrinkage plates are fixed in the guide tube and arranged in a circular array along the axis of the guide tube. The middle part of the plurality of shrinkage plates forms a wire hole for the welding wire to pass through. The end of the shrinkage plate close to the downward clamping is fixedly connected to the guide tube and the connection is an arc transition.

[0019] By adopting the above technical solution, the welding wire is normally conveyed through the wire hole and the shrinking plate is stretched. After the driving motor stops, the shrinking plate recovers elastically and thus clamps the welding wire, thereby reducing the possibility of the welding wire continuing to be conveyed.

[0020] Furthermore, an abutment platform is extended on the outer side of the end of the shrinkage plate away from the downward clamping, and the diameter of the end of the abutment platform away from the downward clamping is smaller than the diameter of the end of the abutment platform close to the downward clamping. Each of the shrinkage plates is also provided with a compression spring on the end away from the downward clamping, and one end of the compression spring is arranged perpendicular to the outer side surface of the abutment platform, and the other end is fixed to the inner wall of the guide tube.

[0021] By adopting the above technical solution, the clamping platform cooperates with the clamping spring to further clamp the welding wire, preventing the welding wire from continuing to move forward under the action of inertia, and reducing excessive wire feeding.

[0022] In summary, the technical solution of the present utility model has the following advantages:

[0023] 1. The low-inertia motor-driven wire feeder provided by the utility model has a built-in deceleration structure in the drive motor and a small rotor size, which makes it relatively convenient to assemble the drive motor and has a fast dynamic response when in use. The installation of the motor base and the motor shaft, transmission cylinder and gear set can be easily matched and matched to achieve the best meshing state, thereby facilitating the control of the motion state.

[0024] 2. The low-inertia motor-driven wire feeder provided by the utility model has a small-sized rotor-armature plate installed between the motor disc frame and the end cover, thereby transforming the drive motor into a low-inertia motor. It has the characteristics of fast dynamic response and improved control accuracy while maintaining the same wire feeding power and efficiency. It is conducive to accurately controlling the wire feeding amount, thereby ensuring the quality of subsequent wire feeding welding.

[0025] 3. The low-inertia motor-driven wire feeder provided by the utility model has a clamping device that does not affect the wire feeding when the driving motor is working. After the driving motor stops, the downward clamping and contraction clamping cooperate to clamp the welding wire, which can start and clamp the welding wire in time, avoid excessive wire feeding, and achieve precise control of wire feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of a wire feeder driven by a low-inertia motor provided in one embodiment of the present utility model;

[0028] Figure 2 A partial cross-sectional view of a driving structure provided in one embodiment of the present utility model;

[0029] Figure 3 A schematic diagram of the internal structure of a drive motor provided in one embodiment of the present utility model;

[0030] Figure 4 This is a schematic diagram of the exploded structure of a drive motor provided in one embodiment of the present utility model;

[0031] Figure 5 This is a schematic diagram of the partial structure of a clamping device provided in one embodiment of the present utility model.

[0032] Description of reference numerals:

[0033] 1. Casing; 11. Bearing seat; 12. Mounting slot; 2. Wire feed reel; 3. Wire feed structure; 4. Drive structure; 5. Drive motor; 51. Motor seat; 511. Rotating seat; 512. Outer shell; 513. End cover; 5131. Rotor slot; 514. Motor reel; 5141. Positioning groove; 515. Armature plate; 52. Motor shaft; 53. Transmission cylinder; 54. Gear set; 541. First main transmission gear; 542. First auxiliary transmission gear; 543. Second main transmission gear; 5 44. Second auxiliary transmission gear; 6. Output shaft; 7. Support frame; 71. Rotating bearing; 8. Clamping device; 81. Downward pressure clamping; 811. Guide wheel; 8111. Guide groove; 812. Downward pressure block; 8121. Downward pressure card; 813. Downward pressure drive; 8131. Magnetic block; 8132. Drive frame; 82. Contraction clamping; 821. Guide cylinder; 822. Contraction plate; 8221. Abutment platform; 823. Threading hole; 824. Compression spring; 83. Clamping frame; 831. Mounting hole. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] A low inertia motor driven wire feeder, such as Figure 1 、 Figure 2 and Figure 3 As shown, the wire feeding drum frame 2 includes a housing 1, a wire feeding structure 3, and a driving structure 4. The wire feeding drum frame 2 is arranged on the upper side of the left end of the housing 1, the wire feeding structure 3 is arranged in the middle of the outer portion of the housing 1, and the driving structure 4 is arranged in the housing 1 and extends outside the housing 1 to connect with the wire feeding structure 3. A clamping device 8 is also provided between the wire feeding drum frame 2 and the wire feeding structure 3. The clamping device 8 is installed outside the housing 1 and is located in front of the wire feeding drum frame 2 and the wire feeding structure 3. The clamping device 8 cooperates with the drive motor 5 to operate. When the drive motor 5 is started, it does not affect the wire feeding operation. After the drive motor 5 stops, it clamps the welding wire by pressing down and contracting 82 to prevent excess wire feeding from affecting the welding quality and ensure the welding effect.

[0036] The driving structure 4 includes a driving motor 5 and an output shaft 6. The driving motor 5 is installed inside the casing 1. The output shaft 6 is arranged below the center of the driving motor 5 and extends out of the driving motor 5. The output shaft 6 is connected to the wire feeding structure 3. The driving motor 5 includes a motor base 51, a motor shaft 52, a transmission cylinder 53 and a gear set 54. The motor shaft 52, the transmission cylinder 53 and the gear set 54 are positioned and rotatably installed in the motor base 51. The motor shaft 52, the transmission cylinder 53 are connected to the gear set 54 and drive the output shaft 6 to move. The motor shaft 52 is arranged at the center of the motor base 51, and the transmission cylinder 53 is arranged on one side below the motor shaft 52 and adjacent to the output shaft 6. The drive motor 5 has a built-in deceleration structure and a small rotor size, which makes it relatively easy to assemble the drive motor 5 and has a fast dynamic response when in use. The installation of the motor base 51 and the motor shaft 52, the transmission cylinder 53 and the gear set 54 can be easily matched to achieve the best meshing state, thereby making it easy to control the motion state, facilitate subsequent operation accuracy and ensure product quality, and make subsequent maintenance and replacement of parts more convenient.

[0037] like Figure 1 and Figure 2 As shown, the motor base 51 is fixed in the casing 1 by bolts, and a bearing seat 11 extends vertically upward from the bottom of the casing 1 corresponding to the motor base 51. A support frame 7 is also provided at the connection between the output shaft 6 and the wire feeding structure 3. The support frame 7 is fixed in the casing 1 and is located on the side of the motor base 51 close to the wire feeding structure 3. A rotating bearing 71 coaxial with the output shaft 6 is installed in the support frame 7. The support frame 7 cooperates with the rotating bearing 71 to support the output shaft 6, improving the supporting force of the output shaft 6 while also limiting it, allowing the output shaft 6 to rotate smoothly and ensuring the coaxial movement of the output shaft 6 and the wire feeding structure 3.

[0038] like Figure 2 、 Figure 3 and Figure 4 As shown, the gear set 54 includes a first main transmission gear 541, a first auxiliary transmission gear 542, a second main transmission gear 543 and a second auxiliary transmission gear 544. The first main transmission gear 541 and the first auxiliary transmission gear 542 are meshed with each other, and the second main transmission gear 543 and the second auxiliary transmission gear 544 are meshed with each other. The first main transmission gear 541 is coaxially arranged with the motor shaft 52, the first auxiliary transmission gear 542 and the second main transmission gear 543 are both coaxially arranged with the transmission cylinder 53, and the second auxiliary transmission gear 544 is coaxially arranged with the output shaft body 6. A rotating seat 511 is extended in the motor base body 51 corresponding to the motor shaft 52, the transmission cylinder 53 and the output shaft body 6. The rotation of the motor shaft 52 drives the first main transmission gear 541 to rotate. The first main transmission gear 541 and the first auxiliary transmission gear 542 are engaged with each other, and the first auxiliary transmission gear 542 and the second main transmission gear 543 are coaxial. Therefore, after the motion is transmitted, the second auxiliary transmission gear 544 engaged with the second main transmission gear 543 is driven to rotate, and finally the output shaft body 6 extending out of the motor base body 51 is rotated to realize the operation of the motor.

[0039] The motor base 51 includes an outer shell 512, an end cover 513 and a motor disc frame 514. The motor disc frame 514 is fixed to the outer shell 512 after being snap-fitted to the end cover 513. A rotating seat 511 for mounting the motor shaft 52 extends from the center of the circle of the motor disc frame 514 close to the outer shell 512. An armature piece 515 is also installed between the motor disc frame 514 and the end cover 513. A rotor slot 5131 for accommodating the armature piece 515 is opened in the end cover 513 close to the motor disc frame 514. A positioning groove 5141 is also provided on the motor disc frame 514 corresponding to the armature piece 515. A small-sized rotor-armature piece 515 is installed between the motor disc frame 514 and the end cover 513, thereby turning the drive motor 5 into a low-inertia motor. It has the characteristics of fast dynamic response and improved control accuracy while keeping the wire feeding power and efficiency unchanged, which is conducive to accurately controlling the wire feeding amount, thereby ensuring the quality of subsequent wire feeding welding. The setting of the positioning groove 5141 and the rotor slot 5131 also facilitates the installation and matching of the armature piece 515 and facilitates positioning processing.

[0040] like Figure 1 and Figure 5As shown, the clamping device 8 includes a downward clamping device 81 and a retracting clamping device 82 arranged in parallel on the left and right. The downward clamping device 81 and the retracting clamping device 82 are both mounted on a clamping frame 83. The clamping frame 83 is movably mounted on the front side of the housing 1. The top and bottom of the clamping frame 83 are each provided with two horizontally parallel mounting holes 831. The side of the housing 1 is provided with two sets of vertically arranged waist-shaped mounting grooves 12 corresponding to the mounting holes 831. The clamping frame 83 is fixed to the housing 1 by bolts. The downward clamping device 81 and the retracting clamping device 82 cooperate to clamp the welding wire after the driving motor 5 stops, and can start to clamp the welding wire in time to avoid overfeeding and achieve precise control of wire feeding. The clamping frame 83 drives the clamping device 8 to move as a whole to match the wire feeding structure 3, reducing bending during wire feeding and improving the quality of the welding wire.

[0041] like Figure 2 and Figure 5 As shown, the downward clamping 81 includes a guide wheel 811, a downward pressing block 812 and a downward pressing drive 813. The guide wheel 811 is positioned and rotatably installed on the clamping frame 83. The axial direction of the guide wheel 811 is perpendicular to the wire feeding direction. A guide groove 8111 is provided on the middle ring of the outer side of the guide wheel 811. The downward pressing block 812 is controlled by the downward pressing drive 813 to slide vertically above the guide wheel 811. A downward pressing card 8121 is extended from the bottom of the downward pressing block 812 corresponding to the guide groove 8111. The downward pressing drive 813 includes two magnetic blocks 8131 and a driving frame 8132. The two magnetic blocks 8131 are respectively arranged at the top of the driving frame 8132 and the top of the downward pressing block 812. The downward pressing block 812 is vertically movably arranged in the driving frame 8132. The magnetic block 8131 is also electrically connected to the driving motor 5. After the driving motor 5 is started, the two magnetic blocks 8131 magnetically attract and drive the lower pressing block 812 to move upward without affecting the feeding of the welding wire. After the driving motor 5 is turned off, the lower pressing block 812 moves downward under the action of gravity and engages with the guide groove 8111 through the lower pressing card 8121, pressing the welding wire to prevent it from continuing to be fed.

[0042] like Figure 1 and Figure 5 As shown, the right end of the downward clamp 81 is provided with a contraction clamp 82. The contraction clamp 82 includes a hollow guide tube 821 and a plurality of contraction plates 822. The axial direction of the guide tube 821 is arranged along the wire feeding direction and is installed horizontally with the clamping frame 83. The guide tube 821 can be fixed or clamped on the clamping frame 83 as required. The contraction plates 822 are fixed in the guide tube 821 and arranged in a circular array along the axis of the guide tube 821. The middle part of the plurality of contraction plates 822 forms a wire hole 823 for the welding wire to pass through. The left end of the contraction plate 822 is fixedly connected to the guide tube 821 and the connection is an arc transition. The welding wire is normally fed through the wire hole 823 and the contraction plate 822 is stretched open. After the drive motor 5 stops, the contraction plate 822 elastically recovers and thus clamps the welding wire, thereby reducing the possibility of continued feeding of the welding wire.

[0043] An abutment 8221 extends outward from the right end of the retracting piece 822. The diameter of the right end of the abutment 8221 is smaller than the diameter of the left end of the abutment 8221. Each retracting piece 822 is also provided with an inclined compression spring 824 at the end away from the downward clamp 81. One end of the compression spring 824 is perpendicular to the outer side of the abutment 8221, and the other end is fixed to the inner sidewall of the corresponding guide tube 821. The abutment cooperates with the compression spring 824 to further clamp the welding wire, preventing the welding wire from continuing to advance due to inertia and reducing overfeeding.

[0044] The working principle and usage of this low-inertia motor-driven wire feeder are as follows: a small-sized armature plate 515 is selected and installed between the motor disc frame 514 and the end cover 513, and then the whole is assembled with the outer shell 512 to form a motor base body 51. A suitable motor shaft 52, a transmission cylinder 53 and a gear set 54 are also installed in the motor base body 51; during the wire feeding operation, the welding wire needs to first pass through the clamping device 8 and then through the wire feeding structure 3 for wire feeding. During normal wire feeding, the clamping device 8 does not work. After the driving motor 5 stops, the downward clamping 81 and the contraction clamping 82 cooperate to clamp the welding wire.

[0045] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge of the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A wire feeder driven by a low inertia motor, characterized in that: The invention comprises a casing (1), a wire feeding reel (2), a wire feeding structure (3) and a driving structure (4), wherein the wire feeding reel (2) is arranged on one side of an upper end of the casing (1), the wire feeding structure (3) is arranged outside the casing (1) at an end away from the wire feeding reel (2), the driving structure (4) is arranged inside the casing (1) and is connected to the wire feeding structure (3) by extending outside the casing (1), the driving structure (4) comprises a driving motor (5) and an output shaft (6), the driving motor (5) is installed inside the casing (1), the output shaft (6) is arranged below the center of the driving motor (5) and extends outside the driving motor (5), the output shaft (6) is connected to the wire feeding structure (3), and ... The motor (5) comprises a motor base (51), a motor shaft (52), a transmission cylinder (53) and a gear set (54); the motor shaft (52), the transmission cylinder (53) and the gear set (54) are positioned and rotatably mounted in the motor base (51); the motor shaft (52), the transmission cylinder (53) and the gear set (54) are connected to drive the output shaft (6) to move; the motor shaft (52) is arranged at the center of the motor base (51); the transmission cylinder (53) is arranged on one side below the motor shaft (52) and adjacent to the output shaft (6); a clamping device (8) is further arranged between the wire feeding disc frame (2) and the wire feeding structure (3); the clamping device (8) is mounted outside the housing (1).

2. A low-inertia motor driven wire feeder according to claim 1, characterized in that: The gear set (54) includes a first main transmission gear (541), a first auxiliary transmission gear (542), a second main transmission gear (543) and a second auxiliary transmission gear (544); the first main transmission gear (541) and the first auxiliary transmission gear (542) are meshed with each other, the second main transmission gear (543) and the second auxiliary transmission gear (544) are meshed with each other, the first main transmission gear (541) is coaxially arranged with the motor shaft (52), the first auxiliary transmission gear (542) and the second main transmission gear (543) are coaxially arranged with the transmission cylinder (53), the second auxiliary transmission gear (544) is coaxially arranged with the output shaft (6), and a rotating seat (511) is extended in the motor seat (51) corresponding to the motor shaft (52), the transmission cylinder (53) and the output shaft (6).

3. A low-inertia motor driven wire feeder according to claim 2, characterized in that: The motor base (51) comprises an outer shell (512), an end cover (513) and a motor disc frame (514). The motor disc frame (514) is fixed to the outer shell (512) after being clamped with the end cover (513). A rotating seat (511) for mounting the motor shaft (52) is extended from the center of a circle of one side of the motor disc frame (514) close to the outer shell (512). An armature piece (515) is also mounted between the motor disc frame (514) and the end cover (513). A rotor slot (5131) for accommodating the armature piece (515) is provided in the side of the end cover (513) close to the motor disc frame (514). A positioning groove (5141) is also provided on the motor disc frame (514) corresponding to the armature piece (515).

4. A low-inertia motor driven wire feeder according to claim 3, characterized in that: The motor base (51) is fixed in the casing (1) by bolts, a bearing seat (11) is extended from the bottom of the casing (1) corresponding to the motor base (51), a support frame (7) is further provided at the connection between the output shaft (6) and the wire feeding structure (3), the support frame (7) is fixed in the casing (1) and is located on a side of the motor base (51) close to the wire feeding structure (3), and a rotating bearing (71) coaxial with the output shaft (6) is installed in the support frame (7).

5. The low-inertia motor-driven wire feeder according to claim 1, characterized in that: The clamping device (8) comprises a downward pressing clamp (81) and a contraction clamp (82) arranged in parallel, the downward pressing clamp (81) and the contraction clamp (82) are both mounted on a clamping frame (83), the clamping frame (83) is movably mounted on the side of the housing (1), the top and bottom of the clamping frame (83) are each provided with two mounting holes (831), the side of the housing (1) is provided with two groups of waist-shaped mounting grooves (12) corresponding to the mounting holes (831), and the clamping frame (83) is fixed to the housing (1) by bolts.

6. The low-inertia motor-driven wire feeder according to claim 5, characterized in that: The downward clamping (81) includes a guide wheel (811), a downward pressing block (812) and a downward pressing drive (813). The guide wheel (811) is positioned and rotatably mounted on the clamping frame (83). The axial direction of the guide wheel (811) is perpendicular to the wire feeding direction. A guide groove (8111) is provided on the middle ring of the outer side of the guide wheel (811). The downward pressing block (812) is controlled by the downward pressing drive (813) to slide vertically above the guide wheel (811). A downward pressing card (8121) is further extended from the guide groove (8111) corresponding to the bottom of the downward pressing block (812). The downward pressing drive (813) includes two magnetic blocks (8131) and a driving frame (8132). The magnetic blocks (8131) are arranged at the top of the driving frame (8132) and the top of the downward pressing block (812). The downward pressing block (812) is movably arranged in the driving frame (8132). The magnetic blocks (8131) are electrically connected to the driving motor (5).

7. The low-inertia motor-driven wire feeder according to claim 6, characterized in that: The downward pressure clamping (81) is provided with a shrinkage clamping (82) at one end close to the wire feeding structure (3), and the shrinkage clamping (82) includes a hollow guide tube (821) and a plurality of shrinkage plates (822). The axial direction of the guide tube (821) is arranged along the wire feeding direction and is transversely installed with the clamping frame (83). The shrinkage plates (822) are fixed in the guide tube (821) and arranged in a circular array along the axis of the guide tube (821). The middle parts of the plurality of shrinkage plates (822) form a wire hole (823) for the welding wire to pass through. The shrinkage plates (822) are fixedly connected to the guide tube (821) at one end close to the downward pressure clamping (81), and the connection is in an arc transition.

8. The low-inertia motor-driven wire feeder according to claim 7, characterized in that: An abutment platform (8221) is extended from the outer side of one end of the shrinkage piece (822) away from the downward clamping (81), and the diameter of the end of the abutment platform (8221) away from the downward clamping (81) is smaller than the diameter of the end of the abutment platform (8221) close to the downward clamping (81). Each shrinkage piece (822) is also provided with a compression spring (824) at one end away from the downward clamping (81), and one end of the compression spring (824) is perpendicularly arranged to the outer side surface of the abutment platform (8221), and the other end is fixed to the inner wall of the guide tube (821).

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