CN212426349U

CN212426349U - Single-groove double-needle plate with double-layer needle plate function

Info

Publication number: CN212426349U
Application number: CN202021372780.XU
Authority: CN
Inventors: 安勇强; 钟佳明; 韩徐斌; 王靖敏; 张锋
Original assignee: Tongxiang Qianglong Machinery Co Ltd
Current assignee: Tongxiang Qianglong Machinery Co Ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-01-29
Anticipated expiration: 2030-07-13

Abstract

The utility model relates to a single-groove double needle plate with double-layer needle plate function, wherein the upper surface of the needle plate main body is provided with inserting sheet grooves which penetrate through the front end and the rear end of the needle plate main body, the inserting sheet grooves are arranged in a row according to the length direction of the needle plate main body, the inserting sheet grooves in one row are distributed in parallel and at equal intervals, inserting sheets are inserted in the inserting sheet grooves, and a needle groove is formed between every two adjacent inserting sheets; two knitting needle groups are placed in the needle groove, and the two knitting needle groups can carry out knitting work independently but not simultaneously; the two knitting needle groups have different structures, and both the two knitting needle groups comprise the same structure of a needle cutting and a long needle; one knitting needle group also comprises long spring needles, and the other knitting needle group also comprises short spring needles; the front ends of the pin and the long pin are connected; the long spring needle and the short spring needle are respectively arranged on the rear part of the long needle matched with the long spring needle; the two knitting needle groups share one selector jack, and the selector jacks are arranged on the long spring needle and the short spring needle together.

Description

Single-groove double-needle plate with double-layer needle plate function

Technical Field

The utility model relates to a computerized flat knitting machine technical field, specifically say, relate to a single groove double needle faller with double-deck faller function.

Background

The computerized flat knitting machine is a double-needle plate latch needle weft knitting loom. The cam device is like a group of plane cams, the stitches of the knitting needles can enter the grooves of the cams, the cams are moved to force the knitting needles to do regular lifting motion in the needle grooves of the needle plate, and the yarns can be knitted into knitted fabrics through the actions of the needle hooks and the needle tongues. In the ascending process of the knitting needle, the coil gradually withdraws from the needle hook, the needle latch is opened, and the withdrawing needle latch is hung on the needle rod; during the descending process of the knitting needle, the needle hook hooks the newly laid yarn and draws and bends the newly laid yarn into a coil, meanwhile, the original coil is separated from the needle hook, the new coil passes through the old coil and is connected with the old coil in series, and the coil strings knitted by a plurality of knitting needles are mutually connected to form the knitted fabric.

At present, most of computerized flat knitting machines on the market are double-needle bed, namely a front needle bed and a back needle bed which are symmetrical front and back are arranged on the flat knitting machines, although the computerized flat knitting machines with the double-needle bed can basically meet the requirements of users, the types of knitted fabrics which can be knitted by the computerized flat knitting machines with the double-needle bed are limited to a certain extent, so that research and development personnel design the computerized flat knitting machines with four needle beds, for example, the flat knitting machine disclosed by the invention patent with the publication number of CN100554555C is provided, the types of knitted fabrics which can be knitted by the four-needle bed flat knitting machine are greatly improved, but an upper layer of needle plate and a lower layer of needle plate are arranged on the front needle bed and the back needle bed, on one hand, the cost of the whole flat knitting machine is increased, the structure is complex, on the other hand, a corresponding two-layer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design is reasonable, have the single groove double needle faller of double-deck faller function.

The utility model provides a technical scheme that above-mentioned problem adopted is: a single-groove double-needle plate with a double-layer needle plate function comprises a needle plate main body, wherein insert grooves penetrating through the front end and the rear end of the needle plate main body are formed in the upper surface of the needle plate main body, the insert grooves are arranged in a row in the length direction of the needle plate main body, the insert grooves in the row are parallel and are distributed at equal intervals, insert pieces are inserted into the insert grooves, and a needle groove is formed between every two adjacent insert pieces; the method is characterized in that: two knitting needle groups are placed in the needle groove, and the two knitting needle groups can carry out knitting work independently but not simultaneously; the two knitting needle groups have different structures, and both the two knitting needle groups comprise the same structure of a needle cutting and a long needle; one knitting needle group also comprises long spring needles, and the other knitting needle group also comprises short spring needles; the front ends of the pin and the long pin are connected; the long spring needle and the short spring needle are respectively arranged on the rear part of the long needle matched with the long spring needle; the two knitting needle groups share one selector jack, and the selector jacks are arranged on the long spring needle and the short spring needle together.

Preferably, the long spring needle and the short spring needle both comprise a spring needle tail part and a spring needle rod, one end of the spring needle rod is connected with the spring needle tail part, and the other end of the spring needle rod is connected with a spring needle butt in a rectangular block shape;

the lengths of the spring needle tails of the long spring needle and the short spring needle are consistent, and the length of the spring needle rod of the long spring needle is larger than that of the spring needle rod of the short spring needle; a projection used for receiving the pushing action of the selector is arranged on the spring needle rod of the long spring needle, and the distance between the projection and the tail part of the spring needle is equal to the distance between the butt of the spring needle on the short spring needle and the tail part of the spring needle; when the needle selecting pieces are arranged on the long spring needle and the short spring needle together, the front ends of the needle selecting pieces abut against the spring needle butt on the short spring needle and the convex block on the long spring needle simultaneously;

the needle selection piece comprises a needle rod, a needle tail, a needle pushing rod and a needle pressing rod; the needle pressing rod is positioned below the needle rod, and the front end parts of the needle pressing rod and the needle pressing rod are connected to the rear side surface of a vertically arranged connecting block; the push needle rod is horizontally arranged, the rear end part of the push needle rod is connected to the front side surface of the connecting block, and the joint of the push needle rod and the connecting block is lower than the joint of the press needle rod and the connecting block; the needle pressing rod comprises a horizontal section and a bending section, one end of the horizontal section is connected with the connecting block, the other end of the horizontal section is connected with the bending section, the bending section is bent in a direction far away from the needle rod, and the lowest point of the tail part of the bending section is slightly lower than the bottom surface of the needle pushing rod; when the needle selecting piece is arranged on the upper surfaces of the long spring needle and the short spring needle, the bottom surface of the needle pushing rod is attached to the upper surfaces of the long spring needle and the short spring needle, and the tail part of the bent section abuts against and descends the upper surfaces of the long spring needle and the short spring needle;

the needle tail is controlled by a needle selector arranged on a bottom plate of the flat knitting machine and connected to the tail part of the rear end of the needle rod; two needle selecting butts which are vertical to the needle bar, are rectangular blocks and are used for being pushed by a triangular bottom plate of the flat knitting machine are arranged on the upper surface of the needle bar; the two needle selecting butts have the same height, wherein one needle selecting butt is arranged at the middle position of the upper surface of the needle rod, and the other needle selecting butt is arranged at the joint of the needle tail and the needle rod.

Preferably, the upper surface of the needle tail is a plane, the height of the plane is higher than the upper surface of the needle bar and lower than the upper top surface of the needle selecting butt; the bottom surface of the needle tail is non-planar and is provided with a dovetail-shaped notch, a needle selection auxiliary sheet is clamped below the needle tail through the dovetail-shaped notch, the bottom surface of the needle selection auxiliary sheet is planar, and a needle selector arranged on a bottom plate of the flat knitting machine controls the needle selection sheet by adsorbing the bottom surface of the needle selection auxiliary sheet.

Preferably, the upper surface of the needle plate main body is also provided with needle separating sheet mounting grooves which penetrate through the left end and the right end of the needle plate main body, the needle separating sheet mounting grooves are vertical to the needle grooves, the needle separating sheet mounting grooves are provided with five, and the five needle separating sheet mounting grooves are arranged along the width direction of the needle plate main body; each needle separating sheet mounting groove is internally provided with a plurality of needle separating sheets which are used for separating two knitting needle groups in the same needle groove and preventing the two knitting needle groups from interfering during working movement; the number of the needle separating sheets arranged in each needle separating sheet mounting groove is equal to that of the needle grooves.

Preferably, all the needle-separating sheets arranged in each needle-separating sheet mounting groove are mounted on a needle-separating sheet base, and the needle-separating sheet base is inserted into the needle-separating sheet mounting groove.

Preferably, two convex limiting notches are arranged at the upper edge of the rear part of the inserting sheet, and needle selecting pressing sheets for pressing the needle selecting sheet and preventing the needle selecting sheet from popping out of the needle groove are inserted into the limiting notches;

preferably, one side of the front part of the needle cutting is provided with a widening sheet, and the needles in the two needle groups are arranged in a mode that the widening sheets are back to back.

Compared with the prior art, the utility model, have following advantage and effect:

1. single groove double needle board: two knitting needle groups are placed in one needle groove, and the two knitting needle groups can respectively but not simultaneously participate in knitting work, so that the single-groove double-needle plate has the functions of an upper layer needle plate and a lower layer needle plate in the prior art, and has the advantages of simple structure, low cost and good use effect compared with the upper layer needle plate and the lower layer needle plate in the prior art;

2. two knitting needle groups in the same needle groove share one needle selection piece, the frequency requirement on a high-frequency electronic needle selector is reduced, in addition, the structural design of the needle selection piece is reasonable, the needle selection piece is provided with an elastic pressing rod and can well press a spring needle on a long needle, a needle tail of the needle selection piece is provided with a needle selection auxiliary piece, the bottom surface of the needle selection auxiliary piece is a plane, the needle selection piece is controlled by adsorbing the bottom surface of the needle selection auxiliary piece by the needle selector arranged on a bottom plate of a flat knitting machine, and the needle selection auxiliary piece can enable the needle selection piece to be better attached to the needle selection piece during movement;

3. the lengths of the spring needles adopted by the two knitting needle groups in the same needle groove are inconsistent, correspondingly, the double-station flat knitting machine adopts a mode that each knitting unit in a bottom plate of the double-station flat knitting machine is provided with two working positions to work with the single-groove double-needle plate in a matched mode, one working position controls the butt of the long spring needle, and the other working position controls the butt of the short spring needle.

Drawings

In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of an embodiment of the present invention.

Fig. 2 is a schematic diagram of the exploded structure of fig. 1.

Fig. 3 is a schematic front view of the embodiment of the present invention.

FIG. 4 is a schematic representation of two differently configured needle sets in an embodiment of the invention, wherein the upper set is the set containing short spring needles and the lower set is the set containing long spring needles.

FIG. 5 is a schematic illustration of a short pogo pin and a long pogo pin in an embodiment of the present invention.

Fig. 6 is a schematic top view of an embodiment of the present invention.

Fig. 7 is a schematic perspective view of the selector jack in the embodiment of the present invention.

Fig. 8 is a schematic front view of the selector jack in the embodiment of the present invention.

Fig. 9 is a schematic structural view of a base plate of the flat knitting machine which cooperates with the single-groove double needle plate in the present embodiment.

Description of reference numerals: a needle plate main body 1; an inserting piece 2, a notch 21 for limiting, a needle selecting pressing sheet 22, a limiting hole 23, a limiting steel wire 24, an inserting piece positioning steel wire 25, an inserting piece pressing sheet 26, a needle cutting 3, a long needle 4,

A long pogo pin 52, a short pogo pin 53, a pogo pin butt 511, a projection 521,

A selector 61, a needle bar 611, a needle tail 612, a pushing needle bar 613, a presser bar 614, a connecting block 615, a selector butt 6111, a selector auxiliary plate 616, a needle separator mounting groove 7, a needle separator 8, a needle separator base 9, a needle separator base,

A triangular bottom plate A1, a knitting pressing sheet A2, a left needle receiving pressing sheet A3, a lapidao pressing sheet A4, a right needle receiving pressing sheet A5 and a non-woven pressing sheet A6.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Examples are given.

See fig. 1-9.

The embodiment discloses a single-groove double-needle plate with double-layer needle plate functions, which comprises a needle plate main body 1, wherein the upper surface of the needle plate main body 1 is provided with insert grooves penetrating through the front end and the rear end of the needle plate main body 1, the insert grooves are arranged in a row according to the length direction of the needle plate main body 1, the insert grooves in the row are parallel and distributed at equal intervals, insert pieces 2 are inserted into the insert grooves, and a needle groove is formed between every two adjacent insert pieces 2; two knitting needle groups are placed in the needle groove, and the two knitting needle groups can independently and simultaneously carry out knitting work, so that the single-groove double-needle-plate device has the functions and effects of an upper layer of needle plate and a lower layer of needle plate.

In addition, the upper surface of the needle plate main body 1 is also provided with needle separating sheet mounting grooves 7 which penetrate through the left end and the right end of the needle plate main body 1, and the needle separating sheet mounting grooves 7 are vertical to the needle grooves. In this embodiment, five needle separating sheet mounting grooves 7 are provided, and the five needle separating sheet mounting grooves 7 are arranged along the width direction of the needle plate main body 1, but the number of the needle separating sheet mounting grooves in other embodiments is not limited to five, and depends on the overall length of the selected knitting needle group.

In the embodiment, each needle separating sheet mounting groove 7 is provided with a plurality of needle separating sheets 8 which are used for separating two knitting needle groups in the same needle groove and preventing the two knitting needle groups from interfering during working movement; the number of the needle separating sheets 8 arranged in each needle separating sheet mounting groove 7 is equal to the number of the needle grooves. All the needle-separating sheets 8 arranged in each needle-separating sheet mounting groove 7 are mounted on a needle-separating sheet base 9, and the needle-separating sheet bases 9 are inserted in the needle-separating sheet mounting grooves 7.

In the present embodiment, the two needle groups are different in configuration, and specifically, both needle groups include the needle shed 3 and the long needle 4 having the same configuration; one needle group also comprises long pogo pins 52 and the other needle group also comprises short pogo pins 53. The front ends of the pin 3 and the long pin 4 are connected; the front end of the needle cutting is provided with a latch for participating in knitting action. The long needle 4 is provided with a needle butt which can be pushed by each triangle arranged on the bottom plate of the flat knitting machine, thereby driving the needle to perform corresponding actions.

In this embodiment, the long pogo pin 52 and the short pogo pin 53 are respectively provided on the rear part of the long pin 4 engaged therewith; the two knitting needle groups share one selector jack 61, and the selector jacks 61 are arranged together above the long pogo pins 52 and the short pogo pins 53. Specifically, the long spring needle 52 and the short spring needle 53 each include a spring needle tail and a spring needle rod, one end of the spring needle rod is connected with the spring needle tail, and the other end of the spring needle rod is connected with a spring needle butt 511 in a rectangular block shape; the spring needle butt 511 is used for receiving the pushing action of the bottom plate of the flat knitting machine.

In this embodiment, the lengths of the spring needle tails of the long spring needle 52 and the short spring needle 53 are the same, and the length of the spring needle rod of the long spring needle 52 is greater than that of the spring needle rod of the short spring needle 53; when the long spring needle and the short spring needle are specifically installed in the needle groove, the tails of the long spring needle and the short spring needle are kept flush, and the front ends of the long spring needle and the short spring needle are arranged in tandem. A projection 521 for receiving the pushing action of the selector 61 is provided on the spring needle shank of the long spring needle 52, and the distance from the projection 521 to the spring needle tail is equal to the distance from the spring needle butt 511 on the short spring needle 53 to the spring needle tail. When the selector plate 61 is arranged jointly above the long pogo pin 52 and the short pogo pin 53, the front end of the selector plate 61 abuts against the pogo pin butt 511 on the short pogo pin 53 and also abuts against the projection 521 on the long pogo pin 52.

In this embodiment, the selector 61 is subjected to the action of a selector that preselects needles participating in knitting. The selector jack 61 includes a needle bar 611, a needle tail 612, a pusher bar 613, and a presser bar 614. The presser bar 614 is located below the needle bar 611, and both front ends are connected to the rear side of a vertically arranged connecting block 615. The pushing pin rod 613 is horizontally disposed, and the rear end thereof is connected to the front side of the connecting block 615, and the connection of the pushing pin rod 613 and the connecting block 615 is lower than the connection of the presser bar 614 and the connecting block 615.

In this embodiment, the needle pressing rod 614 includes a horizontal section and a curved section, one end of the horizontal section is connected to the connecting block 615, the other end of the horizontal section is connected to the curved section, the curved section is curved in a direction away from the needle bar 611, and the lowest point of the tail of the curved section is slightly lower than the bottom surface of the needle pushing rod 613; when the selector plate 61 is disposed above the long pogo pins 52 and the short pogo pins 53, the bottom surface of the pusher bar 613 abuts on the upper surfaces of the long pogo pins 52 and the short pogo pins 53, and the tail of the bent section abuts on and descends the upper surfaces of the long pogo pins 52 and the short pogo pins 53. The presser bar 614 has a certain elastic deformability, and provides a pressing force to the pogo pin, thereby better pressing the pogo pin against the long pin 4.

The needle tail 612 is controlled by a needle selector arranged on the bottom plate of the flat knitting machine and is connected with the tail part of the rear end of the needle rod 611; two rectangular block-shaped needle selecting butts 6111 which are perpendicular to the needle bar 611 and are used for being pushed by a triangular bottom plate of the flat knitting machine are arranged on the upper surface of the needle bar 611; the two needle selecting butts 6111 have the same height, one of the two needle selecting butts 6111 is arranged at the middle position of the upper surface of the needle bar 611, and the other needle selecting butt 6111 is arranged at the joint of the needle tail 612 and the needle bar 611.

The upper surface of the needle tail 612 is a plane higher than the upper surface of the needle bar 611 and lower than the upper top surface of the needle selecting butt 6111; the lower bottom surface of the needle tail 612 is non-planar and is provided with a dovetail-shaped notch, a needle selection auxiliary piece 616 is clamped below the needle tail 612 through the dovetail-shaped notch, the bottom surface of the needle selection auxiliary piece 616 is planar, and a needle selector mounted on a bottom plate of the flat knitting machine controls the needle selection piece 61 by adsorbing the bottom surface of the needle selection auxiliary piece 616. The selector jack 616 enables the selector jack 61 to be more appropriately fitted during movement. The needle selector selects a high-frequency electronic needle selector.

In this embodiment, two convex-shaped position-limiting notches 21 are provided at the upper edge of the rear portion of the jack 2, and needle selection pressing pieces 22 for pressing the selector jack 61 and preventing the selector jack 61 from being ejected from the needle groove are inserted into the position-limiting notches 21.

In this embodiment, three limiting holes 23 are provided at the rear portion of the insert 2, a limiting steel wire 24 is installed in each limiting hole 23, and the three limiting steel wires 24 are respectively used for limiting the long needle 4, the selector jack 61, and the long and short spring needles 52 and 53. The long and short pogo pins 52, 53 have three status positions: A. h, B, the tail part of the spring needle has three slots corresponding to three status positions, when the long and short spring needles 52, 53 are in different status positions, the location is clamped to the corresponding limit steel wire 24 by the slots.

In this embodiment, be provided with an inserted sheet location breach that is used for prescribing a limit to the mounted position of inserted sheet at the anterior lower limb of inserted sheet 2, be equipped with an inserted sheet spacing groove on faller main part 1 upper surface simultaneously, when installing the inserted sheet in the inserted sheet groove, ensure that inserted sheet location breach falls in the inserted sheet spacing groove, and alternate an inserted sheet location steel wire 25 in the inserted sheet spacing groove, inserted sheet location steel wire is located inserted sheet location breach simultaneously, prevent that inserted sheet 2 from excessively removing to faller main part 1 front end, all inserted sheets 2 adopt an inserted sheet clamp plate 26 to press the inserted sheet in the faller main part.

In this embodiment, the single-groove double-needle plate cooperates with a flat knitting machine bottom plate having two stations when working, referring to fig. 9, the flat knitting machine bottom plate having two stations includes knitting units, each knitting unit is configured with two working positions, the two working positions are arranged up and down, wherein a knitting needle group including long spring needles in the single-groove double-needle plate is controlled by the working position located above the flat knitting machine bottom plate, and a knitting needle group including short spring needles is controlled by the working position located below the flat knitting machine bottom plate. Each work station comprises a knitting pressing sheet A2, a left needle receiving pressing sheet A3, a mesh hanging pressing sheet A4, a right needle receiving pressing sheet A5 and a non-knitting pressing sheet A6 which can protrude from the triangular bottom plate A1 to press needles or retract into the triangular bottom plate A1 to release the needles under the driving of power. The knitting pressing piece A2 is positioned above the non-knitting pressing piece A6, and the left needle receiving pressing piece A3, the eye catching pressing piece A4 and the right needle receiving pressing piece A5 are sequentially arranged from left to right and positioned between the knitting pressing piece A2 and the non-knitting pressing piece A6.

In this embodiment, only one needle group of two needle groups in the same needle groove is involved in the operation at the same time, the needle group involved in the operation is controlled by the corresponding operation position and the knitting unit to perform the knitting operation, and the needle group not involved in the operation is pressed into the needle groove by the corresponding operation position and does not take out the needle.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the patent idea of the utility model are included in the protection scope of the patent of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. A single-groove double-needle plate with double-layer needle plate functions comprises a needle plate main body (1), wherein insert grooves penetrating through the front end and the rear end of the needle plate main body (1) are formed in the upper surface of the needle plate main body (1), the insert grooves are arranged in a row in the length direction of the needle plate main body (1), the insert grooves in the row are distributed in parallel and at equal intervals, insert pieces (2) are inserted into the insert grooves, and a needle groove is formed between every two adjacent insert pieces (2); the method is characterized in that: two knitting needle groups are placed in the needle groove, and the two knitting needle groups can carry out knitting work independently but not simultaneously; the two knitting needle groups have different structures, and both the two knitting needle groups comprise a needle cutting (3) and a long needle (4) which have the same structure; one needle group further comprises long spring needles (52), and the other needle group further comprises short spring needles (53); the front ends of the pin (3) and the long pin (4) are connected; the long spring needle (52) and the short spring needle (53) are respectively arranged on the rear part of the long needle (4) matched with the long spring needle; the two knitting needle groups share one selector (61), and the selector (61) is arranged on the long spring needle (52) and the short spring needle (53) together.

2. The single-groove double-needle plate having the double-layer needle plate function as claimed in claim 1, wherein: the long spring needle (52) and the short spring needle (53) respectively comprise a spring needle tail part and a spring needle rod, one end of the spring needle rod is connected with the spring needle tail part, and the other end of the spring needle rod is connected with a spring needle butt (511) in a rectangular block shape;

the lengths of the spring needle tails of the long spring needle (52) and the short spring needle (53) are consistent, and the length of the spring needle rod of the long spring needle (52) is greater than that of the spring needle rod of the short spring needle (53); a lug (521) for receiving the pushing action of the selector jack (61) is arranged on the spring needle rod of the long spring needle (52), and the distance between the lug (521) and the spring needle tail is equal to the distance between the spring needle butt (511) on the short spring needle (53) and the spring needle tail; when the selector jack (61) is arranged on the long spring needle (52) and the short spring needle (53) together, the front end of the selector jack (61) abuts against a spring needle butt (511) on the short spring needle (53) and simultaneously abuts against a bump (521) on the long spring needle (52);

the needle selection sheet (61) comprises a needle rod (611), a needle tail (612), a needle pushing rod (613) and a needle pressing rod (614); the needle pressing rod (614) is positioned below the needle rod (611), and the front ends of the needle pressing rod and the needle pressing rod are connected to the rear side of a vertically arranged connecting block (615); the push needle rod (613) is horizontally arranged, the rear end of the push needle rod is connected to the front side surface of the connecting block (615), and the connecting position of the push needle rod (613) and the connecting block (615) is lower than the connecting position of the press needle rod (614) and the connecting block (615); the needle pressing rod (614) comprises a horizontal section and a bent section, one end of the horizontal section is connected with the connecting block (615), the other end of the horizontal section is connected with the bent section, the bent section is bent in a direction far away from the needle rod (611), and the lowest point of the tail part of the bent section is slightly lower than the bottom surface of the needle pushing rod (613); when the needle selecting sheet (61) is arranged on the upper surfaces of the long spring needle (52) and the short spring needle (53), the bottom surface of the needle pushing rod (613) is attached to the upper surfaces of the long spring needle (52) and the short spring needle (53), and the tail part of the bending section abuts against and descends the upper surfaces of the long spring needle (52) and the short spring needle (53);

the needle tail (612) is controlled by a needle selector arranged on a bottom plate of the flat knitting machine and is connected to the tail part of the rear end of the needle rod (611); two needle selecting butts (6111) which are vertical to the needle bar (611), are rectangular blocks and are used for being pushed by a triangular bottom plate of the flat knitting machine; the two needle selecting butts (6111) have the same height, wherein one needle selecting butt (6111) is arranged at the middle position of the upper surface of the needle rod (611), and the other needle selecting butt (6111) is arranged at the joint of the needle tail (612) and the needle rod (611).

3. The single-groove double-needle plate having the double-layer needle plate function as claimed in claim 2, wherein: the upper surface of the needle tail (612) is a plane, the height of the plane is higher than the upper surface of the needle bar (611) and lower than the upper top surface of the needle selecting butt (6111); the lower bottom surface of the needle tail (612) is non-planar and is provided with a dovetail-shaped gap, a needle selection auxiliary sheet (616) is clamped below the needle tail (612) through the dovetail-shaped gap, the bottom surface of the needle selection auxiliary sheet (616) is planar, and a needle selector arranged on a bottom plate of the flat knitting machine controls the needle selection sheet (61) by adsorbing the bottom surface of the needle selection auxiliary sheet (616).

4. The single-groove double-needle plate having the double-layer needle plate function as claimed in claim 1, wherein: the needle plate comprises a needle plate main body (1), and is characterized in that needle separating sheet mounting grooves (7) penetrating through the left end and the right end of the needle plate main body (1) are further formed in the upper surface of the needle plate main body (1), the needle separating sheet mounting grooves (7) are perpendicular to needle grooves, five needle separating sheet mounting grooves (7) are formed in the needle separating sheet mounting grooves (7), and the five needle separating sheet mounting grooves (7) are arranged in the width direction of the needle plate main body (1); each needle separating sheet mounting groove (7) is internally provided with a plurality of needle separating sheets (8) which are used for separating two knitting needle groups in the same needle groove and preventing the two knitting needle groups from interfering during working movement; the number of the needle separating sheets (8) arranged in each needle separating sheet mounting groove (7) is equal to that of the needle grooves.

5. The single-groove double-needle plate having the double-layer needle plate function as claimed in claim 4, wherein: all the needle separating sheets (8) arranged in each needle separating sheet mounting groove (7) are mounted on a needle separating sheet base (9), and the needle separating sheet bases (9) are inserted in the needle separating sheet mounting grooves (7).

6. The single-groove double-needle plate having the double-layer needle plate function as claimed in claim 1, wherein: two convex limiting notches (21) are arranged at the upper edge of the rear part of the inserting piece (2), and needle selecting pressing sheets (22) for pressing the needle selecting piece (61) and preventing the needle selecting piece (61) from popping out of a needle groove are inserted into the limiting notches (21).

7. The single-groove double-needle plate having the double-layer needle plate function as claimed in claim 1, wherein: one side of the front part of the needle cutting (3) is provided with a widening sheet, and the needles (3) in the two knitting needle groups are arranged in a mode that the widening sheets are back to back.