CN217252465U

CN217252465U - Silver silk feeding mechanism

Info

Publication number: CN217252465U
Application number: CN202220959972.3U
Authority: CN
Inventors: 袁卫兵; 陈知如; 李帆顺; 冉光玲; 黎金刚
Original assignee: YUEQING TONGDA WIRE ELECTRIC FACTORY
Current assignee: YUEQING TONGDA WIRE ELECTRIC FACTORY
Priority date: 2022-04-23
Filing date: 2022-04-23
Publication date: 2022-08-23
Anticipated expiration: 2032-04-23

Abstract

The utility model relates to a silver silk feeding mechanism relates to feeding mechanism's technical field, and it is including accepting the board, accept fixedly connected with supporting shoe on the board, run through on the supporting shoe and be provided with the supported hole that supplies the silver silk to pass, it has the pay-off piece to accept horizontal sliding connection on the board, run through on the pay-off piece be provided with the pay-off hole that the supported hole was aimed at, the downthehole fixture that is used for centre gripping silver silk that is provided with of pay-off, be provided with the stopping mechanism that is used for restricting the silver silk to roll back in the supported hole, it is used for the drive to accept to be provided with on the board the driving piece of supporting shoe motion. Through driving piece control pay-off block reciprocating sliding, utilize fixture to press from both sides tightly or loosen the silver silk simultaneously, realize the stable pay-off of silver silk, this design makes the user only need control the movement distance of pay-off block, can control the pay-off length of silver silk, improves the pay-off precision of silver silk, and then improves the production uniformity of product.

Description

Silver silk feeding mechanism

Technical Field

The application relates to the field of feeding mechanisms, in particular to a silver wire feeding mechanism.

Background

The silver contact is an intersection point at which the silver contact is separated from and brought into contact with each other when the electronic appliance is opened or closed, and is applied to various electronic and electric components. The silver wire feeding mechanism is a device for feeding silver wires.

In the production of the conductive element in the related art, the silver wire is manually conveyed to the metal plate, then the silver wire is cut by the cutting mechanism to obtain the silver column, and then the silver column is pressed and riveted on the metal plate by the pressing and riveting mechanism, so that the production of the conductive element can be realized.

Aiming at the related technologies, the silver wires are fed manually, and the consistency of the feeding length of the silver wires is relatively poor, so that the length of the silver columns is difficult to control, the production consistency of products is influenced, and the improvement is needed.

SUMMERY OF THE UTILITY MODEL

In order to improve the production uniformity of product, this application provides a silver silk feeding mechanism.

The application provides a silver silk feeding mechanism adopts following technical scheme:

a silver wire feeding mechanism comprises a receiving plate, wherein a supporting block is fixedly connected to the receiving plate, a supporting hole for a silver wire to penetrate through is arranged in the supporting block in a penetrating mode, a feeding block is connected to the receiving plate in a horizontal sliding mode, a feeding hole aligned with the supporting hole is arranged in the feeding block in a penetrating mode, a clamping mechanism used for clamping the silver wire is arranged in the feeding hole, a stopping mechanism used for limiting the silver wire to return is arranged in the supporting hole, a driving piece used for driving the supporting block to move is arranged on the receiving plate, when the feeding block slides towards the direction far away from the supporting block, the silver wire is clamped by the clamping mechanism, and when the feeding block slides towards the supporting block, the silver wire is loosened by the clamping mechanism.

Through adopting above-mentioned technical scheme, when needs carry out the pay-off to the silver silk, slide through the direction that the supporting shoe was kept away from to driving piece control pay-off piece orientation, at this moment, fixture presss from both sides tight silver silk to make the silver silk follow pay-off piece synchronous motion, and then realize the pay-off of silver silk. When the driving piece control pay-off piece slided towards the supporting shoe, fixture loosened the silver silk to stopping mechanism carries on spacingly to the silver silk, and at this moment, fixture and silver silk relative slip, then fixture and pay-off piece reset, so reciprocal, can realize the serialization pay-off operation of silver silk. The design enables a user to realize stable feeding and accurate feeding of the silver wires only by controlling the stroke of the feeding block, so that the feeding length of the silver wires at each time can be the same as far as possible, and the production consistency of products is further improved.

Optionally, the clamping mechanism includes: the clamping pipe horizontally penetrates through the feeding hole in a sliding mode and is used for silver wires to penetrate through; the clamping block is fixed at one end, far away from the supporting block, of the clamping pipe, a clamping hole for the silver wire to pass through is formed in the clamping block, and the clamping hole is communicated with the clamping pipe; the mounting holes are arranged in a plurality and respectively penetrate through the clamping blocks, and the mounting holes are uniformly distributed along the circumferential direction of the clamping blocks; the clamping columns are arranged and movably arranged in the corresponding mounting holes respectively, and are used for abutting against the silver wires; the control spring is arranged on the feeding block and is used for driving the clamping pipe to move towards the supporting block; the clamping block is in a round table shape, the clamping block is close to the radius of one side of the clamping pipe is smaller than the radius of the other side of the clamping pipe, a tightening groove matched with the clamping block is formed in the port of the feeding hole, and the circumferential side wall of the clamping column can be abutted to the inner wall of the tightening groove.

Through adopting above-mentioned technical scheme, when the pay-off piece slided towards the direction of keeping away from the supporting shoe, the grip block drove grip pipe simultaneous movement under the butt of tightening up the inslot wall. At the moment, the clamping column increasingly abuts against the silver wire under the abutting of the inner wall of the tightening groove, so that the silver wire is clamped, and then the silver wire can be pulled to move by the clamping block. When the pay-off piece slides towards the direction of supporting shoe, the grip block has the trend of following the roll-off in tightening up the groove, and simultaneously, the lateral wall of centre gripping post has the trend of separating with the inner wall that tightens up the groove to make the centre gripping post loosen the silver silk. Subsequently, the clamping tube drives the clamping block to reset under the action of the control spring, and the feeding operation of the silver wires can be realized by reciprocating. Through setting up ingenious, the simple operation's of structure fixture, realize the quick centre gripping of silver silk and relax, and then realize the quick pay-off of silver silk and stabilize the pay-off, and then improve feeding mechanism's stability in use. Simultaneously, when driving piece control pay-off piece reciprocating sliding, a plurality of centre gripping posts can self-holding or loosen the silver-colored silk, can save the driving source, can improve the linkage nature between each part again, can also improve the utilization efficiency of resources.

Optionally, the retaining mechanism includes: the anti-return pipe is horizontally and slidably arranged in the supporting hole and is used for the silver wire to pass through; the retaining block is fixed at one end, close to the clamping pipe, of the retaining pipe, a retaining hole for the silver wire to pass through is formed in the retaining block, and the retaining hole is communicated with the retaining pipe; the abdicating holes are arranged in a plurality and respectively penetrate through the retaining block, and the abdicating holes are uniformly distributed along the circumferential direction of the retaining block; the backstop columns are arranged and movably arranged in the corresponding abdicating holes respectively, and are used for abutting against the silver wires; the pipe control spring is arranged on the supporting block and is used for driving the retaining pipe to move towards the direction far away from the clamping pipe; the clamping pipe comprises a clamping pipe body, a clamping block, a stopping block and a stopping hole, wherein the stopping block is in a round table shape, the stopping block is close to the radius of one side of the clamping pipe body is larger than the radius of the other side of the clamping pipe body, a bundling groove matched with the stopping block is formed in a port of the stopping hole, and the circumferential side wall of the stopping column can be abutted to the inner wall of the bundling groove.

Through adopting above-mentioned technical scheme, when the silver-colored silk carries out the pay-off, the stopping piece has the trend from collecting the groove roll-off under the drive of silver-colored silk, and the lateral wall of stopping post has the trend of separation with the inner wall in collecting the groove to make a plurality of stopping posts loosen the silver-colored silk, make the silver-colored silk can steady pay-off. When the silver silk received to pull, the stopping post supported the silver silk increasingly under the butt of binding up inslot wall to the realization is tight to the clamp of silver silk, and then realizes the stopping to the silver silk. Through setting up the stopping mechanism that the structure is ingenious, the simple operation, realize the quick clamping to the silver-colored silk with relax to realize the quick stopping of silver-colored silk, and then improve feeding mechanism's stability in use.

Optionally, when the retaining block extends out of the retraction groove, the retaining block can push the clamping tube to slide.

Through adopting above-mentioned technical scheme, when needs take out silver silk from stopping pipe and centre gripping pipe, promote the pipe that stops and drive the motion of stopping piece, then the stopping piece promotes the centre gripping pipe and drives the motion of centre gripping piece. When the end part of the retaining block extends out of the tightening groove and the end part of the clamping block extends out of the tightening groove, the silver wire can be loosened, and then the silver wire can be pulled out. Because the stopping block can push the clamping pipe to slide, a user only needs to push the stopping pipe, and the synchronous motion of the stopping block and the clamping block can be realized, so that the operation convenience can be improved, and the working efficiency can be improved.

Optionally, the pay-off hole is close to the mounting groove has been seted up to the port department of stopping piece one side, control spring is located in the mounting groove, the centre gripping pipe is close to a threaded sleeve of stopping piece is equipped with the collar, control spring's one end with the tank bottom butt of mounting groove, and the other end with the collar butt.

Through adopting above-mentioned technical scheme, through setting up the control spring that can dismantle, in case the control spring appears warping the back, the user can change control spring, can improve the maintenance convenience, can reduce cost of maintenance again. Meanwhile, a user can replace control springs with different elastic potential energy to adjust the reset speed of components such as the clamping pipe and the like, and the practicability is improved.

Optionally, the holding tank has been seted up in the port department of centre gripping pipe one side is kept away from in the brace hole, the management and control spring is located in the holding tank, the stopping pipe is kept away from the one end screw thread cover of stopping piece is equipped with the support ring, the one end of management and control spring with the tank bottom butt of holding tank, and the other end with the support ring butt.

Through adopting above-mentioned technical scheme, through setting up the management and control spring that can dismantle, in case the management and control spring appears warping the back, the user can change the management and control spring, can improve the maintenance convenience, can reduce cost of maintenance again. Simultaneously, the user can change the management and control spring of different elastic potential energy to realize the adjustment of parts such as check pipe speed that resets, improve the practicality. Meanwhile, the control spring with large elastic potential energy is replaced, the risk that other personnel mistakenly touch the return pipe to unlock the silver wire is reduced, and the use stability of the feeding mechanism is further improved.

Optionally, the driving member includes a driving block fixed on a side wall of the feeding block, a control rod arranged above the feeding block, and a driving inclined plane arranged on the feeding block, the driving inclined plane is abutted by the control rod, after the control rod moves downwards, the feeding block can move towards a direction away from the supporting block under the combined action of the driving inclined plane and the control rod, and the receiving plate is provided with a return spring for driving the feeding block to move towards the supporting block.

Through adopting above-mentioned technical scheme, when the control lever downstream, the pay-off piece moves towards the direction of keeping away from the supporting shoe under the combined action of drive inclined plane and control lever. When the control rod moves downwards, the feeding block drives the control rod and other parts to reset under the elastic action of the reset spring. Through setting up simple structure, the operation of being convenient for, the stable driving piece of drive effect, realize the steady motion of pay-off piece, and then realize the steady pay-off of silver silk. Simultaneously, the user can be connected outside cylinder or electric putter with the control lever to realize the accurate control of the vertical motion stroke of control lever, and then improve the pay-off precision of silver silk, further improve the production uniformity of product.

Optionally, the lower end of the control rod is provided with a guide inclined plane matched with the driving inclined plane.

Through adopting above-mentioned technical scheme, through setting up the direction inclined plane, improve the direction effect to control lever and drive block to improve the motion ride comfort of drive block, and then improve the stability in use.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the design ensures that a user can control the feeding length of the silver wire by controlling the movement distance of the feeding block, improves the feeding precision of the silver wire and further improves the production consistency of products;

2. through setting up ingenious, the simple operation's of structure fixture, realize the quick centre gripping of silver silk and relax, and then realize the quick pay-off of silver silk and stabilize the pay-off, and then improve feeding mechanism's stability in use

3. Through setting up the stopping mechanism that the structure is ingenious, the simple operation, realize the quick clamping to the silver-colored silk with relax to realize the quick stopping of silver-colored silk, and then improve feeding mechanism's stability in use.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is a partial cross-sectional view of an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a driving member in the embodiment of the present application.

FIG. 4 is a partial cross-sectional view of a feedblock and support block in an embodiment of the present application.

Fig. 5 is an enlarged schematic view of the region a in fig. 4.

Fig. 6 is an enlarged schematic view of the region B in fig. 4.

Description of reference numerals: 1. a bearing plate; 2. a feeding block; 3. a feed hole; 4. a clamping mechanism; 41. clamping the tube; 42. a clamping block; 43. a clamping hole; 44. mounting holes; 45. a clamping post; 46. tightening the groove; 47. a control spring; 5. a support block; 6. a support hole; 7. a backstop mechanism; 71. a withdrawal stopping tube; 72. a backstop block; 73. a backstop hole; 74. a hole of abdication; 75. a backstop post; 76. a bundling groove; 77. a control spring; 8. a drive member; 81. a drive block; 82. a control lever; 83. a drive ramp; 84. a return spring; 9. a guide slope; 10. mounting grooves; 11. a mounting ring; 12. accommodating grooves; 13. and (4) a support ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses silver silk feeding mechanism. Referring to fig. 1 and 2, the silver wire feeding mechanism comprises a horizontally arranged receiving plate 1, a feeding block 2 is horizontally and slidably connected to the receiving plate 1, and a feeding hole 3 for the silver wire to pass through is horizontally arranged on the feeding block 2 in a penetrating manner. Meanwhile, a clamping mechanism 4 for clamping the silver wires is arranged in the feeding hole 3, and a driving piece 8 for driving the supporting block 5 to move is arranged on the bearing plate 1.

Referring to fig. 1 and 2, a supporting block 5 is fixedly connected to the upper surface of the receiving plate 1, a supporting hole 6 for passing the silver wire is horizontally arranged on the supporting block 5 in a penetrating manner, and the supporting hole 6 is aligned with the feeding hole 3. Meanwhile, a retaining mechanism 7 is arranged in the supporting hole 6, and the retaining mechanism 7 is used for limiting the silver wire to be separated from the supporting hole 6.

When the silver wire needs to be fed, the feeding block 2 is controlled to slide towards the direction far away from the supporting block 5 through the driving piece 8, and at the moment, the silver wire is clamped by the clamping mechanism 4, so that the silver wire can move synchronously along with the feeding block 2, and feeding of the silver wire is realized.

When the driving piece 8 controls the feeding block 2 to slide towards the supporting block 5, the silver wire is loosened by the clamping mechanism 4, and the stopping mechanism 7 limits the silver wire. At the moment, the clamping mechanism 4 and the silver wire slide relatively, then the clamping mechanism 4 and the feeding block 2 reset, and the continuous feeding operation of the silver wire can be realized by reciprocating.

Referring to fig. 3, the driving member 8 includes a driving block 81 fixedly connected to the side wall of the feeding block 2, and a driving inclined surface 83 is integrally formed on the driving block 81. A control lever 82 is provided above the driving block 81, a driving slope 83 is abutted by the control lever 82, and a guide slope 9 fitted to the driving slope 83 is integrally formed at the lower end of the control lever 82. When the control rod 82 is driven by an external air cylinder or an electric push rod to move downwards and the guide inclined surface 9 is abutted with the driving inclined surface 83, the feeding block 2 can move towards the direction far away from the supporting block 5 under the combined action of the driving inclined surface 83 and the control rod 82.

Referring to fig. 3, the receiving plate 1 is provided with a return spring 84, one end of the return spring 84 is fixedly connected with the receiving plate 1, and the other end is fixedly connected with the feeding block 2. When the control lever 82 moves upward, the feedblock 2 can move toward the support block 5 and be reset by the elastic force of the return spring 84.

Referring to fig. 3 and 4, the clamping mechanism 4 includes a clamping tube 41 horizontally slidably disposed in the feeding hole 3, and the clamping tube 41 is penetrated by the silver wire. The end of the clamping pipe 41 far away from the supporting block 5 is integrally formed with a clamping block 42, a clamping hole 43 communicated with the clamping pipe 41 penetrates through the clamping block 42, and the clamping hole 43 is used for silver wires to penetrate through.

Referring to fig. 3 and 4, a plurality of mounting holes 44 are formed in the clamping block 42 in a penetrating manner along the circumferential direction of the clamping block, a clamping column 45 is movably arranged in each mounting hole 44, and the circumferential side wall of each clamping column 45 is used for abutting against the silver wire. The clamping block 42 is in a circular truncated cone shape, the radius of one side, close to the clamping pipe 41, of the clamping block 42 is smaller than that of the other side, meanwhile, a tightening groove 46 matched with the clamping block 42 is formed in the port of one side, away from the supporting block 5, of the feeding hole 3, and the circumferential side wall of the clamping column 45 can be abutted to the inner wall of the tightening groove 46.

Referring to fig. 3 and 4, a mounting groove 10 is formed in a port of the feeding hole 3 on the side away from the tightening groove 46, and a control spring 47 located in the mounting groove 10 is sleeved on the clamping tube 41. One end of the clamping tube 41 far away from the clamping block 42 is threaded and sleeved with a mounting ring 11, one end of a control spring 47 is abutted with the bottom of the mounting groove 10, the other end of the control spring is abutted with the mounting ring 11, and the control spring 47 is used for driving the clamping tube 41 to move towards the supporting block 5.

When the feeding block 2 slides towards the direction far away from the supporting block 5, the clamping block 42 drives the clamping pipe 41 to move synchronously under the abutting of the inner wall of the tightening groove 46. At this moment, the clamping column 45 increasingly abuts against the silver wire under the abutting of the inner wall of the tightening groove 46, so that the silver wire is clamped, and then the clamping block 42 can pull the silver wire to move, so that the feeding operation of the silver wire is realized.

When the feedblock 2 slides in the direction of the support block 5, the gripping block 42 has a tendency to slide out of the tightening groove 46, while the side walls of the gripping stud 45 have a tendency to separate from the inner walls of the tightening groove 46, thus causing the gripping stud 45 to loosen the silver wire. Subsequently, the clamping tube 41 drives the clamping block 42 to reset under the action of the elastic force of the control spring 47, and the feeding operation of the silver wires can be realized by reciprocating.

Referring to fig. 3 and 5, the retaining mechanism 7 includes a retaining tube 71 horizontally slidably disposed in the support hole 6, and the retaining tube 71 is penetrated by the silver wire. A retaining block 72 is integrally formed at one end of the retaining tube 71 close to the clamping tube 41, a retaining hole 73 communicated with the retaining tube 71 is horizontally penetrated through the retaining block 72, and the silver wire passes through the retaining hole 73.

Referring to fig. 3 and 5, a plurality of abdicating holes 74 are formed in the anti-backing block 72 in a penetrating manner along the circumferential direction of the anti-backing block, an anti-backing column 75 is movably arranged in each abdicating hole 74, and the circumferential side wall of the anti-backing column 75 is used for abutting against the silver wires. The stopping block 72 is in a circular truncated cone shape, the radius of one side, close to the feeding block 2, of the stopping block 72 is larger than that of the other side of the stopping block, meanwhile, a bundling groove 76 matched with the stopping block 72 is formed in a port part, close to the feeding block 2, of the stopping hole 73, and the circumferential side wall of the stopping column 75 can be abutted to the inner wall of the bundling groove 76.

Referring to fig. 3 and 5, an accommodating groove 12 is formed in a port of the support hole 6 on the side away from the feeding block 2, and a control spring 77 located in the accommodating groove 12 is sleeved on the retaining pipe 71. The threaded sleeve of one end of the backstop pipe 71 far away from the backstop block 72 is provided with a support ring 13, one end of a control spring 77 is abutted against the groove bottom of the accommodating groove 12, the other end of the control spring is abutted against the support ring 13, and the control spring 77 is used for driving the backstop pipe 71 to move towards the direction far away from the feeding block 2.

When the silver wire is fed, the retaining block 72 has a tendency of sliding out of the converging groove 76 under the driving of the silver wire, and at the moment, the side wall of the retaining column 75 and the inner wall of the converging groove 76 have a separation tendency, so that the retaining columns 75 loosen the silver wire, and the silver wire can be fed stably. When the silver wire is pulled, the retaining column 75 increasingly supports against the silver wire under the abutting of the inner wall of the converging groove 76, so that the silver wire is clamped, and the retaining of the silver wire is further realized.

Referring to fig. 4 and 5, when the end of the retaining block 72 protrudes from the constricting channel 76, the retaining block 72 can push the clamp tube 41 to slide. When the silver wire needs to be taken out of the retaining tube 71 and the clamping tube 41, the retaining tube 71 is pushed to drive the retaining block 72 to move, and then the retaining block 72 pushes the clamping tube 41 to drive the clamping block 42 to move. When the end of the backstop block 72 protrudes from the cinch slot 76 and the end of the clamp block 42 protrudes from the cinch slot 46, the silver wire is released and can be withdrawn.

Referring to fig. 4 and 5, the clamping block 42 and the retaining block 72 have the same size and shape, the clamping tube 41 and the retaining tube 71 have the same size and shape, and the clamping column 45 and the retaining column 75 have the same size and shape, so that the components can be interchanged, the production cost can be reduced, and the full utilization of resources can be realized.

The implementation principle of a silver silk feeding mechanism of the embodiment of the application is as follows: through the direction slip of driving piece 8 control feedblock 2 orientation keeping away from supporting shoe 5, at this moment, fixture 4 presss from both sides tight silver silk to make the silver silk follow feedblock 2 synchronous motion, and then realize the pay-off of silver silk. The design enables a user to realize stable feeding and accurate feeding of the silver wires only by controlling the stroke of the feeding block 2, so that the feeding length of the silver wires at each time can be the same as far as possible, and the production consistency of products is further improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a silver silk feeding mechanism which characterized in that: the silver wire drawing device comprises a bearing plate (1), wherein a supporting block (5) is fixedly connected to the bearing plate (1), a supporting hole (6) for silver wires to penetrate through is arranged on the supporting block (5) in a penetrating mode, a feeding block (2) is horizontally and slidably connected to the bearing plate (1), a feeding hole (3) aligned with the supporting hole (6) is arranged on the feeding block (2) in a penetrating mode, a clamping mechanism (4) used for clamping the silver wires is arranged in the feeding hole (3), a backstop mechanism (7) used for limiting the silver wires to retreat is arranged in the supporting hole (6), a driving piece (8) used for driving the supporting block (5) to move is arranged on the bearing plate (1), when the feeding block (2) slides towards the direction far away from the supporting block (5), the silver wires are clamped by the clamping mechanism (4), and when the feeding block (2) slides towards the supporting block (5), the silver wire is loosened by the clamping mechanism (4).

2. The silver wire feeding mechanism according to claim 1, wherein: the clamping mechanism (4) comprises:

the clamping pipe (41) horizontally penetrates through the feeding hole (3) in a sliding mode, and silver wires pass through the clamping pipe (41);

the clamping block (42) is fixed at one end, far away from the supporting block (5), of the clamping pipe (41), a clamping hole (43) for silver wires to pass through is formed in the clamping block (42), and the clamping hole (43) is communicated with the clamping pipe (41);

a plurality of mounting holes (44) are arranged and respectively penetrate through the clamping block (42), and the mounting holes (44) are uniformly distributed along the circumferential direction of the clamping block (42);

the clamping columns (45) are arranged and movably arranged in the corresponding mounting holes (44) respectively, and the clamping columns (45) are used for abutting against the silver wires;

the control spring (47) is arranged on the feeding block (2) and is used for driving the clamping pipe (41) to move towards the supporting block (5);

wherein, grip block (42) are the round platform form, grip block (42) are close to the radius of centre gripping pipe (41) one side is less than the radius of opposite side, the port department of pay-off hole (3) be provided with grip block (42) tighten up groove (46) that agree with mutually, the circumference lateral wall of centre gripping post (45) can with tighten up the inner wall butt in groove (46).

3. The silver wire feeding mechanism according to claim 2, wherein: the retaining mechanism (7) comprises:

the anti-return pipe (71) is horizontally and slidably arranged in the support hole (6), and the anti-return pipe (71) is used for silver wires to pass through;

the retaining block (72) is fixed at one end, close to the clamping tube (41), of the retaining tube (71), the retaining block (72) is provided with a retaining hole (73) for a silver wire to pass through, and the retaining hole (73) is communicated with the retaining tube (71);

the abdicating holes (74) are arranged in a plurality and penetrate through the retaining block (72) respectively, and the abdicating holes (74) are uniformly distributed along the circumferential direction of the retaining block (72);

the backstop posts (75) are arranged and movably arranged in the corresponding abdicating holes (74) respectively, and the backstop posts (75) are used for abutting against the silver wires;

the pipe control spring (77) is arranged on the supporting block (5) and is used for driving the anti-return pipe (71) to move towards the direction away from the clamping pipe (41);

wherein, stopping block (72) is the round platform form, stopping block (72) are close to the radius of centre gripping pipe (41) one side is greater than the radius of opposite side, the port department of stopping hole (73) be provided with the receipts that stopping block (72) agree with mutually restraint groove (76), the circumference lateral wall of stopping post (75) can with the inner wall butt in receipts bundle groove (76).

4. The silver wire feeding mechanism according to claim 3, wherein: when the retaining block (72) extends out of the restraining groove (76), the retaining block (72) can push the clamping pipe (41) to slide.

5. The silver wire feeding mechanism according to claim 3, wherein: feeding hole (3) are close to mounting groove (10) have been seted up to the port department of stopping piece (72) one side, control spring (47) are located in mounting groove (10), centre gripping pipe (41) are close to the one end screw thread cover of stopping piece (72) is equipped with collar (11), the one end of control spring (47) with the tank bottom butt of mounting groove (10) and the other end with collar (11) butt.

6. The silver wire feeding mechanism according to claim 3, wherein: keep away from support hole (6) holding tank (12) have been seted up in the port department of centre gripping pipe (41) one side, management and control spring (77) are located in holding tank (12), stopping pipe (71) are kept away from the one end screw thread cover of stopping piece (72) is equipped with support ring (13), the one end of management and control spring (77) with the tank bottom butt of holding tank (12), and the other end with support ring (13) butt.

7. The silver wire feeding mechanism according to claim 1, wherein: the driving piece (8) comprises a driving block (81) fixed on the side wall of the feeding block (2), a control rod (82) arranged above the feeding block (2) and a driving inclined plane (83) arranged on the feeding block (2), the driving inclined plane (83) is used for abutting against the control rod (82), when the control rod (82) moves downwards, the feeding block (2) can move towards the direction far away from the supporting block (5) under the combined action of the driving inclined plane (83) and the control rod (82), and a reset spring (84) used for driving the feeding block (2) to move towards the supporting block (5) is arranged on the bearing plate (1).

8. The silver wire feeding mechanism according to claim 7, wherein: the lower end part of the control rod (82) is provided with a guide inclined plane (9) matched with the driving inclined plane (83).