CN112719158A

CN112719158A - Wire rod intermittent feeding device

Info

Publication number: CN112719158A
Application number: CN202011404368.6A
Authority: CN
Inventors: 吴遵胜; 王玥; 姜鑫
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-04-30

Abstract

The invention discloses a wire intermittent feeding device which comprises a cam (1), a main shaft (2), a rack (3), a wire passing groove (4), a dragging and clamping assembly (5), a motor (6) and the like; the adjustable mechanism is added, the cylinder is selected as a driving element of the clamping mechanism, the size of a driving force arm is reasonably designed to ensure sufficient driving moment, the appearance of the wire passing groove (4) is designed into an S-arc shape, and the like; the following disadvantages of similar equipment in the current market are solved: the cutting length is not uniform due to the fact that the feeding length of the wire rod and the wire rod play cannot be timely and accurately adjusted according to production requirements, the equipment is blocked due to insufficient dragging force, the cutting length is too short due to the fact that the clamping force is too small and slides, the wire rod is damaged due to the fact that the clamping force is too large, and the installation and debugging are difficult.

Description

Wire rod intermittent feeding device

Technical Field

The invention relates to the technical field of wire cutting, in particular to an intermittent wire feeding device.

Background

The subject is funded by the university of Anhui Engineers innovate fund project.

In the production process of the manufacturing industry, the raw materials of some wires are required to be cut intermittently so as to meet the requirements of subsequent production, such as thin steel wires for binding mobile phone data wires or paper clips for clamping files. The current equipment on the market has single function, can only realize the feeding of wires with equal length, and cannot timely and accurately adjust the feeding length according to the production requirement; and is easy to appear in the production process: uneven cutting length caused by wire play; insufficient dragging force causes the equipment to be stuck; the clipping length is too short due to sliding generated by too small clamping force; the wire is damaged by being clamped due to overlarge clamping force; difficulty in installation and debugging and the like.

In order to meet the challenge brought by the addition of RCEP in China, the problems are urgently needed to be solved, the manufacturing industry strength of China is improved, and sufficient background is provided for China to compete with advanced products in China such as Japan and Korean to compete with the advanced products in the market.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides the wire intermittent feeding device which is simple and reasonable in structure, convenient to operate and use and convenient for a user to finish the cutting process of uniform and equal-length wire materials.

The technical problem to be solved by the invention is realized by adopting the following technical scheme.

The invention relates to an intermittent wire feeding device, which comprises a cam 1, a main shaft 2, a rack 3, a wire passing groove 4, a dragging and clamping assembly 5, a motor 6 and the like; the cam 1 and the main shaft 2 are fixedly installed into a whole, the cam 1 and the frame 3 form a rotating pair through the main shaft 2 and are installed on a first hole 311 on the frame 3; the motor 6 is fixedly connected with the main shaft 2 into a whole to provide torque for driving the cam 1; the dragging and clamping assembly 5 is fixedly arranged on the frame 3 through a second hole 312, a third hole 313 and a fourth hole 314 on the frame 3 respectively; the wire passing groove 4 is fixedly arranged on the frame 3, and one end of the wire passing groove is matched with the wire inlet 321 on the frame 3, and the other end of the wire passing groove is matched with the wire outlet 322.

Further, a groove 11 for accommodating the cam follower 60 is milled on the surface of the cam 1, a main shaft mounting hole 12 matched with a main shaft is formed in the center of a base circle of the cam 1, and a key groove 13 for transmitting torque is formed in the hole; the cam 1 is made of a forged piece blank so as to prolong the service life of core parts.

Further, the dragging and clamping assembly 5 comprises a dragging main arm 51 and a dragging auxiliary arm 52, wherein the dragging auxiliary arm 52 is connected with the dragging main arm 51 through a dragging auxiliary arm mounting hole 512 on the dragging main arm 51 to form a rotation pair; the adjusting rod rotating shaft 56 is connected with the dragging main arm 51 through an adjusting rod positioning hole 513 on the dragging main arm 51 to form a rotating pair, the adjusting rod 58 is fixedly connected with the adjusting rod rotating shaft 56 into a whole, the tail end of the adjusting rod 58 is arranged on a thread, the tail end of the adjusting rod 58 penetrates through a locking plate 521 fixedly arranged on the dragging auxiliary arm 52, and nuts are respectively connected to two sides of the locking plate 521 of the adjusting rod 58 and used for adjusting and locking an included angle between the dragging main arm 51 and the dragging auxiliary arm 52 so as to adjust the feeding length of a wire; the trailing sub-arm 52 is terminated by a cam follower 60 which engages the groove 11 in the cam 1.

Further, a dragging main arm mounting hole 511, a dragging auxiliary arm mounting hole 512, an adjusting and positioning mounting hole 513, a fixed clamp mounting hole 151, a movable clamp mounting hole 514 and a scale 5121 are respectively arranged on the dragging main arm 51 of the dragging and clamping assembly 5; the circle centers of the dragging main arm mounting hole 511, the dragging auxiliary arm mounting hole 512, the adjusting and positioning mounting hole 513 and the fixed clamp mounting hole 151 are positioned on the same axis; the movable clamp mounting hole 514 is positioned at one side of the axis; the scale 5121 is used for displaying the wire feeding length corresponding to the included angle between the main dragging arm 51 and the auxiliary dragging arm 52 in real time.

Further, the dragging and clamping assembly 5 comprises a fixed clamp 59a and a movable clamp 59b, wherein the fixed clamp 59a is fixedly installed on a fixed clamp installation hole 515 on the dragging main arm 51; the movable clamp 59b is integrally installed with the dragging main arm through a movable clamp installation hole 514 on the dragging main arm 51 to form a revolute pair; one end of the movable clamp 59b is matched with the fixed clamp 59a to clamp the wire, and the other end of the movable clamp 59b is connected with the air cylinder 55 through the clamping connecting rod 53 and the air cylinder connecting rod 54 to drive the movable clamp 59 b; the movable clamp 59b and the clamp link 53 form a revolute pair through a joint bearing a57a, the clamp link 53 and the cylinder link 54 form a revolute pair through a joint bearing b57b, and the cylinder link 54 and the cylinder 55 form a revolute pair through a joint bearing c57 c.

Further, the blank of the clamping connecting rod 53 in the dragging and clamping assembly 5 is a hexagonal rod, and both ends of the blank are threaded, and the thread turning directions are opposite, that is, one end is a left-handed thread and the other end is a right-handed thread; meanwhile, the joint bearing a57a and the joint bearing b57b are provided with mounting holes which are a left-handed thread and a right-handed thread, and are matched with each other during mounting.

Further, the cylinder 55 in the drag and clamp assembly 5 is of the single-acting spring-return linear reciprocating cylinder type.

Further, the overall shape of the wire passing groove 4 is designed to be S-arc shape, so that the wires therein can be ensured to have certain tension in a bending state, and unnecessary movement is avoided.

Further, the frame 3 includes a bottom plate 31 and a side wall 32, and a first hole 311 for installing the main shaft 2, a second hole 312 for installing the dragging main arm 51, a third hole 313 for installing the cylinder link 54, a fourth hole 314 for installing the cylinder 55, and the like are respectively arranged on the bottom plate 31; the side wall 32 is provided with a wire inlet 321 and a wire outlet 322 which are matched with the wire passing groove 4.

The invention has the beneficial effects that:

compared with the prior art, the intermittent wire feeding device provided by the invention solves the problem of uneven cutting length caused by wire movement in the conventional similar equipment; insufficient dragging force causes the equipment to be stuck; the clipping length is too short due to sliding generated by too small clamping force; the wire is damaged by being clamped due to overlarge clamping force; difficult installation and debugging and the like. The specific method comprises the following steps:

through changing the whole appearance of crossing wire casing 4, will cross the whole appearance design of wire casing 4 and be the S arc for make the wire rod wherein guarantee certain tension under the bending state, solve unnecessary drunkenness.

Due to the fact that the distance between the dragging auxiliary arm mounting hole 512 on the dragging main arm 51 and the dragging main arm mounting hole 511 is reasonably designed and arranged, a proper dragging driving force arm is obtained, the motor 6 can provide enough dragging driving moment through the cam 1, and the problem that equipment is blocked due to insufficient dragging force is solved.

Through designing the fixture as adjustable link mechanism, and the driver part is cylinder 55, can be based on the different reasonable selection working air pressure of the material that will pull the wire rod, guarantee that clamping force size is suitable, solved that clamping force undersize produces the cutting length that slides and causes too short and the too big problem that causes the wire rod to be pressed from both sides the damage of causing of clamping force.

The adjusting rod 58 is arranged between the dragging main arm 51 and the dragging auxiliary arm 52, so that the included angle between the dragging main arm 51 and the dragging auxiliary arm 52 is adjustable, in the process of matching with the cam 1, the wire feeding length is adjustable, the adjustment is convenient, only the nut for locking the relative position of the adjusting rod 58 needs to be loosened, the dragging auxiliary arm 52 is adjusted to a required position opposite to the scale 5121 on the dragging main arm 51, and the nut is screwed again. The mechanism easily realizes the accurate adjustment of the feeding length of the wire rod.

Through the one-level adjustable length's of design connecting rod be centre gripping connecting rod 53 between movable clamp 59b and cylinder 55 for adjust the clamping position of movable clamp 59b when conveniently installing and debugging for the first time, the concrete method is: adjusting the relative position of the cam 1 and the dragging and clamping assembly 5 to be in a theoretical wire clamping position, ventilating the air cylinder 55, observing whether the movable clamp 59b is clamped with the fixed clamp 59a, and if a gap exists between the movable clamp and the fixed clamp, properly increasing the length of the movable clamp by rotating the clamping connecting rod 53 to ensure that the air cylinder 55 can be attached with a certain clamping force during ventilating and clamping; then the relative position of the cam 1 and the dragging and clamping assembly 5 is adjusted to be in the theoretical wire releasing position, then the air cylinder 55 is cut off, and whether the movable clamp 59b and the fixed clamp 59a have enough clearance is observed, if no clearance or insufficient clearance exists, the length of the clamping connecting rod 53 is properly reduced by rotating to ensure that the air cylinder 55 does not contact with the wire when the air cylinder is cut off, released and returned. The problem that the movable clamp 59b and the fixed clamp 59a cannot be normally matched due to manufacturing and assembling precision is easily solved through the method, and debugging is simple and convenient.

Drawings

FIG. 1 is a schematic front view of the overall explosive structure of the present invention

FIG. 2 is a schematic view of the back of the overall explosive structure of the present invention

FIG. 3 is a schematic view showing the state of completion of installation of the overall structure of the present invention

FIG. 4 is a schematic view of the rack structure of the present invention

FIG. 5 is a schematic view of the front and back sides of the cam of the present invention

FIG. 6 is a front and back isometric view of the cam of the present invention

FIG. 7 is a schematic view of the front and back sides of the drag and clamp assembly of the present invention

FIG. 8 is a front and back isometric view of the tow and clamp assembly of the present invention

FIG. 9 is a schematic diagram of the structure of the trailing main arm 51 of the present invention

In fig. 1 to 9:

the adjustable clamp device comprises a cam 1, a groove 11, a main shaft mounting hole 12, a key groove 13, a main shaft 2, a frame 3, a bottom plate 31, a first hole 311, a second hole 312, a third hole 313, a fourth hole 314, a side wall 32, a wire inlet 312, a wire outlet 322, a wire passing groove 4, a dragging and clamping assembly 5, a dragging main arm 51, a dragging main arm mounting hole 511, a dragging auxiliary arm mounting hole 512, scales 5121, an adjusting rod positioning hole 513, a moving clamp mounting hole 514, a fixed clamp mounting hole 515, a dragging auxiliary arm 52, a locking plate 521, a clamping connecting rod 53, a cylinder connecting rod 54, a cylinder 55, an adjusting rod rotating shaft 56, a joint bearing a57a, a joint bearing b57b, a joint bearing c57c, an adjusting rod 58, a fixed clamp 59a, a moving clamp 59b, a cam follower 60.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments and the drawings.

An intermittent wire feeding device as shown in fig. 1 to 9 comprises a cam 1, a main shaft 2, a frame 3, a wire passing groove 4, a dragging and clamping assembly 5, a motor 6 and the like; the cam 1 and the main shaft 2 are fixedly installed into a whole, the cam 1 and the frame 3 form a rotating pair through the main shaft 2 and are installed on a first hole 311 on the frame 3; the motor 6 is fixedly connected with the main shaft 2 into a whole to provide torque for driving the cam 1; the dragging and clamping assembly 5 is fixedly arranged on the frame 3 through a second hole 312, a third hole 313 and a fourth hole 314 on the frame 3 respectively; the wire passing groove 4 is fixedly arranged on the frame 3, and one end of the wire passing groove is matched with the wire inlet 321 on the frame 3, and the other end of the wire passing groove is matched with the wire outlet 322.

As shown in fig. 5 and 6, a groove 11 for accommodating a cam follower 60 is milled on the surface of the cam 1, a spindle mounting hole 12 for mounting a spindle in a matching manner is formed in the center of a base circle of the cam 1, and a key groove 13 for transmitting torque is formed in the hole; the cam 1 is made of a forged piece blank so as to prolong the service life of core parts.

The dragging and clamping assembly 5 shown in fig. 7 to 9 comprises a dragging main arm 51 and a dragging auxiliary arm 52, wherein the dragging auxiliary arm 52 is connected with the dragging main arm 51 through a dragging auxiliary arm mounting hole 512 on the dragging main arm 51 and forms a rotation pair; the adjusting rod rotating shaft 56 is connected with the dragging main arm 51 through an adjusting rod positioning hole 513 on the dragging main arm 51 to form a rotating pair, the adjusting rod 58 is fixedly connected with the adjusting rod rotating shaft 56 into a whole, the tail end of the adjusting rod 58 is arranged on a thread, the tail end of the adjusting rod 58 penetrates through a locking plate 521 fixedly arranged on the dragging auxiliary arm 52, and nuts are respectively connected to two sides of the locking plate 521 of the adjusting rod 58 and used for adjusting and locking an included angle between the dragging main arm 51 and the dragging auxiliary arm 52 so as to adjust the feeding length of a wire; the trailing sub-arm 52 is terminated by a cam follower 60 which engages the groove 11 in the cam 1.

As shown in fig. 9, a dragging main arm mounting hole 511, a dragging auxiliary arm mounting hole 512, an adjusting and positioning mounting hole 513, a fixed clamp mounting hole 151, a movable clamp mounting hole 514 and a scale 5121 are respectively arranged on a dragging main arm 51 in the dragging and clamping assembly 5; the circle centers of the dragging main arm mounting hole 511, the dragging auxiliary arm mounting hole 512, the adjusting and positioning mounting hole 513 and the fixed clamp mounting hole 151 are positioned on the same axis; the movable clamp mounting hole 514 is positioned at one side of the axis; the scale 5121 is used for displaying the wire feeding length corresponding to the included angle between the main dragging arm 51 and the auxiliary dragging arm 52 in real time.

The towing and clamping assembly 5 shown in fig. 7 to 9 comprises a fixed clamp 59a and a movable clamp 59b, wherein the fixed clamp 59a is fixedly mounted on a fixed clamp mounting hole 515 on the towing main arm 51; the movable clamp 59b is integrally installed with the dragging main arm through a movable clamp installation hole 514 on the dragging main arm 51 to form a revolute pair; one end of the movable clamp 59b is matched with the fixed clamp 59a to clamp the wire, and the other end of the movable clamp 59b is connected with the air cylinder 55 through the clamping connecting rod 53 and the air cylinder connecting rod 54 to drive the movable clamp 59 b; a revolute pair is formed between the movable clamp 59b and the clamping connecting rod 53 through a joint bearing a57a, a revolute pair is formed between the clamping connecting rod 53 and the cylinder connecting rod 54 through a joint bearing b57b, and a revolute pair is formed between the cylinder connecting rod 54 and the cylinder 55 through a joint bearing c57 c;

as shown in fig. 7 and 8, the blank of the clamping connecting rod 53 in the dragging and clamping assembly 5 is a hexagonal rod, and both ends of the hexagonal rod are threaded, and the thread directions are opposite, that is, one end is a left-handed thread and the other end is a right-handed thread; meanwhile, the joint bearing a57a and the joint bearing b57b are provided with mounting holes which are a left-handed thread and a right-handed thread, and are matched with each other during mounting.

The cylinder 55 in the tow and clamp assembly 5 shown in fig. 7 and 8 is of the single-acting spring-return linear reciprocating cylinder type.

The overall shape of the wire-passing groove 4 shown in fig. 1 to 3 is designed to be S-arc shape, so that the wire therein can ensure a certain tension in a bending state, and avoid unnecessary movement.

The frame 3 shown in fig. 4 includes a bottom plate 31 and a side wall 32, the bottom plate 31 is respectively provided with a first hole 311 for installing the main shaft 2, a second hole 312 for installing the dragging main arm 51, a third hole 313 for installing the cylinder link 54, a fourth hole 314 for installing the cylinder 55, and the like; the side wall 32 is provided with a wire inlet 321 and a wire outlet 322 which are matched with the wire passing groove 4.

During installation, the main shaft 2 is firstly installed on the frame 3, the motor 6 is installed below the main shaft, the wire passing groove 4 is installed on the frame 3, the cam 1 is fixedly installed above the main shaft 2, and finally the dragging and clamping assembly 5 is installed on the frame 3 and matched with the wire passing groove 4 and the cam 1, so that installation is completed.

During debugging, the device is debugged according to the theoretical positions corresponding to the four working stages of the cam 1. That is, the point where the cam 1 contacts the cam follower 60 is in the "near rest phase", "lift phase", "far rest phase", and "return phase", which correspond to the "closest stroke pause state", "grip and advance state", "farthest stroke pause state", and "open and retreat state" of the fixed clip 59a and the movable clip 59b in the drag and grip assembly 5, respectively. Firstly, selecting proper air cylinder 55 pressure according to the material characteristics of the wire, ensuring certain clamping force on the premise of ensuring that the wire is not pinched, then adjusting the included angle between the dragging main arm 51 and the dragging auxiliary arm 52 according to the required cutting length and the scale 5121 on the dragging main arm 51, and finally adjusting the relative position between the adjusting clamp 59a and the movable clamp 59b, wherein the specific method comprises the following steps: adjusting the relative position of the cam 1 and the dragging and clamping assembly 5 to be in a theoretical wire clamping position, ventilating the air cylinder 55, observing whether the movable clamp 59b is clamped with the fixed clamp 59a, and if a gap exists between the movable clamp and the fixed clamp, properly increasing the length of the movable clamp by rotating the clamping connecting rod 53 to ensure that the air cylinder 55 can be attached with a certain clamping force during ventilating and clamping; then the relative position of the cam 1 and the dragging and clamping assembly 5 is adjusted to be in the theoretical wire releasing position, then the air cylinder 55 is cut off, and whether the movable clamp 59b and the fixed clamp 59a have enough clearance is observed, if no clearance or insufficient clearance exists, the length of the clamping connecting rod 53 is properly reduced by rotating to ensure that the air cylinder 55 does not contact with the wire when the air cylinder is cut off, released and returned. All debugging is completed in the above way.

During operation, the motor drives the cam 1 to rotate, the cam 1 drives the dragging main arm 51 and the accessories thereof to swing in the rack 1 through the cam follower 60 installed on the dragging auxiliary arm 52, and the specific operation correspondence relationship is as follows: the contact point of the cam 1 with the cam follower 60 is in the "near rest phase", "lift phase", "far rest phase" and "return phase", corresponding to the "closest stroke pause state", "grip and advance state", "farthest stroke pause state" and "open and retreat state" of the fixed clip 59a and the movable clip 59b in the drag and grip assembly 5, respectively.

In conclusion, the intermittent wire feeding device provided by the invention solves the problem of uneven cutting length caused by wire movement in the conventional similar equipment; insufficient dragging force causes the equipment to be stuck; the clipping length is too short due to sliding generated by too small clamping force; the wire is damaged by being clamped due to overlarge clamping force; difficult installation and debugging and the like. The specific method comprises the following steps:

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An intermittent wire feeding device, characterized in that: comprises a cam (1), a main shaft (2), a frame (3), a wire passing groove (4), a dragging and clamping component (5), a motor (6) and the like; the cam (1) and the main shaft (2) are fixedly installed into a whole, the cam (1) and the rack (3) form a rotating pair through the main shaft (2) and are installed on a first hole (311) in the rack (3); the motor (6) is fixedly connected with the main shaft (2) into a whole to provide torque for the driving of the cam (1); the dragging and clamping assembly (5) is fixedly arranged on the rack (3) through a second hole (312), a third hole (313) and a fourth hole (314) on the rack (3) respectively; the wire passing groove (4) is fixedly arranged on the rack (3), and one end of the wire passing groove is matched with the wire inlet (321) on the rack (3) while the other end is matched with the wire outlet (322).

2. An intermittent wire feeding device as defined in claim 1, wherein: a groove (11) for accommodating a cam follower (60) is milled on the surface of the cam (1), a main shaft mounting hole (12) matched with a main shaft is formed in the center of a base circle of the cam (1), and a key groove (13) for transmitting torque is formed in the hole; the cam (1) selects a forging blank to prolong the service life of core parts.

3. An intermittent wire feeding device as defined in claim 1, wherein: the dragging and clamping assembly (5) comprises a dragging main arm (51) and a dragging auxiliary arm (52), wherein the dragging auxiliary arm (52) is connected with the dragging main arm (51) through a dragging auxiliary arm mounting hole (512) in the dragging main arm (51) to form a revolute pair; the adjusting rod rotating shaft (56) is connected with the dragging main arm (51) through an adjusting rod positioning hole (513) in the dragging main arm (51) to form a rotating pair, the adjusting rod (58) is fixedly connected with the adjusting rod rotating shaft (56) into a whole, the tail end of the adjusting rod (58) is arranged on a thread, the tail end of the adjusting rod (58) penetrates through a locking plate (521) fixedly arranged on the dragging auxiliary arm (52), and nuts are respectively connected to two sides of the locking plate (521) of the adjusting rod (58) and used for adjusting and locking an included angle between the dragging main arm (51) and the dragging auxiliary arm (52) so as to adjust the feeding length of a wire; the tail end of the dragging auxiliary arm (52) is provided with a cam follower (60) matched with the groove (11) on the cam (1).

4. Dragging and clamping assembly (5) according to claim 3, characterized in that: a dragging main arm mounting hole (511), a dragging auxiliary arm mounting hole (512), an adjusting and positioning mounting hole (513), a fixed clamp mounting hole (151), a movable clamp mounting hole (514) and scales (5121) are respectively arranged on a dragging main arm (51) in the dragging and clamping assembly (5); the circle centers of the dragging main arm mounting hole (511), the dragging auxiliary arm mounting hole (512), the adjusting and positioning mounting hole (513) and the clamping mounting hole (151) are positioned on the same axis; the movable clamp mounting hole (514) is positioned on one side of the axis; the scale (5121) is used for displaying the wire feeding length corresponding to the included angle between the dragging main arm (51) and the dragging auxiliary arm (52) in real time.

5. An intermittent wire feeding device as defined in claim 1, wherein: the dragging and clamping assembly (5) comprises a fixed clamp (59a) and a movable clamp (59b), and the fixed clamp (59a) is fixedly arranged on a fixed clamp mounting hole (515) on the dragging main arm (51); the movable clamp (59b) is integrally installed with the dragging main arm through a movable clamp installation hole (514) on the dragging main arm (51) to form a revolute pair; one end of the movable clamp (59b) is matched with the fixed clamp (59a) to clamp the wire, and the other end of the movable clamp (59b) is connected with the air cylinder (55) through the clamping connecting rod (53) and the air cylinder connecting rod (54) and used for driving the movable clamp (59 b); a revolute pair is formed between the movable clamp (59b) and the clamping connecting rod (53) through a joint bearing a (57a), a revolute pair is formed between the clamping connecting rod (53) and the air cylinder connecting rod (54) through a joint bearing b (57b), and a revolute pair is formed between the air cylinder connecting rod (54) and the air cylinder (55) through a joint bearing c (57 c).

6. Dragging and clamping assembly (5) according to claim 5, characterized in that: a blank of a clamping connecting rod (53) in the dragging and clamping assembly (5) is a hexagonal rod, threads are turned at two ends of the blank, the thread turning directions are opposite, namely, one end is a left-handed thread, and the other end is a right-handed thread; meanwhile, the mounting holes of the knuckle bearing a (57a) and the knuckle bearing b (57b) are a left-handed thread and a right-handed thread, and the mounting holes are matched with each other during mounting.

7. Dragging and clamping assembly (5) according to claim 5, characterized in that: the type of the air cylinder (55) in the dragging and clamping assembly (5) is a single-acting spring reset linear reciprocating air cylinder.

8. An intermittent wire feeding device as defined in claim 1, wherein: the overall appearance of the wire passing groove (4) is designed into an S-arc shape, so that wires in the wire passing groove can be ensured to have certain tension in a bending state, and unnecessary movement is avoided.

9. An intermittent wire feeding device as defined in claim 1, wherein: the machine frame (3) comprises a bottom plate (31) and a side wall (32), wherein a first hole (311) for mounting the main shaft (2), a second hole (312) for mounting the dragging main arm (51), a third hole (313) for mounting the cylinder connecting rod (54), a fourth hole (314) for mounting the cylinder (55) and the like are respectively arranged on the bottom plate (31); the side wall (32) is provided with a wire inlet (321) and a wire outlet (322) which are matched with the wire passing groove (4).