Cutting-free upper head changing transition ring mechanism capable of automatically pushing out whole circle of yarn

Abstract

The utility model relates to the technical field of glass fiber kiln wire drawing equipment, in particular to a cutting-free upper head changing transition ring mechanism capable of automatically pushing out a whole circle of yarn. The upper head changing transition ring mechanism comprises an upper head changing transition ring, an upper head changing piston rod, an upper head changing air cylinder cover, an upper head changing elastic piece, an end cover, a buffering component and a yarn pushing mechanism. According to the cutting-free head feeding and replacing transition ring mechanism capable of automatically pushing out the whole circle of yarn, through cooperation with the machine head main shaft, head feeding and head replacing operation of a wire drawing machine can be automatically completed, transition yarn formed in the head feeding and head replacing process can be automatically treated, and the production efficiency is improved. The labor intensity is reduced, the automation degree is improved, and the safety condition of man-machine cooperation is improved. Meanwhile, the whole circle of transition yarn can be recycled, the recovery value of the transition yarn is improved, and the broken wool yarn is prevented from polluting the environment.

Description

Technical Field

[0001] The present application relates to the technical field of glass fiber kiln drawing equipment, and in particular to a cutting-free upper head-changing transition ring mechanism capable of automatically pushing out a full circle of yarn. Background Art

[0002] As a composite reinforcing material, glass fiber has a wide range of applications and comes in a variety of varieties. It can be directly drawn into cylindrical yarn balls through a wire drawing machine, or drawn into horse-shaped yarn balls through a wire cake drawing machine.

[0003] In the current fiberglass kiln drawing process, the full-bobbin replacement and automatic head loading of the wire drawing machine are achieved by winding the yarn on the upper wire ring through a V-groove plus a wire hook or an upper wire ring with a threaded groove plus a wire hook. This is also a more superior upper wire ring structure in recent years. However, the yarn left on the upper wire ring is difficult to remove by the robot. It must be cut and cleared manually on site before the robot can complete the yarn removal work. Such human-machine cooperation has safety hazards and cannot achieve automated continuous production.

[0004] With the progress of society, harsh working environment and operational safety have become top priorities. Now we have entered the era of intelligent manufacturing. It is imperative to use closed fully automatic robots to replace manual operations in the wire drawing area, and to save energy and reduce consumption to improve production efficiency. In order to solve the problem of how to improve the utilization value of waste yarn and unmanned automation, the cutting and removal of yarn left on the upper wire ring must be broken through to achieve the upgrade of existing equipment, realize the automated production operation of unmanned pushing out the whole circle of waste yarn, improve the overall performance and efficiency of existing wire drawing machines, and increase the residual value of waste yarn to achieve significant economic benefits. Utility Model Content

[0005] In view of this, the present application provides a cutting-free upper head-changing transition ring mechanism that can automatically push out a full circle of yarn to solve all or part of the technical problems described in the background technology part of the present application.

[0006] The solutions provided by this application to solve its technical problems are:

[0007] A cutting-free upper head-changing transition ring mechanism capable of automatically pushing out a full circle of yarn comprises an upper head-changing transition ring, on which a transition slope, a transition ring cavity and a centrifugal yarn-pushing channel are arranged;

[0008] The transition slope is arranged on the outer circumference of the upper head-changing transition ring, the transition ring cavity passes through the upper head-changing transition ring, and the centrifugal yarn pushing channel is arranged on the cavity body of the transition ring cavity and extends to the transition slope.

[0009] Preferably, the upper head-changing transition ring is also provided with a machine head assembly part and a yarn-breaking groove; the machine head assembly part is arranged at one end of the upper head-changing transition ring, and is used to assemble the upper head-changing transition ring to the machine head main shaft of the wire drawing machine; the yarn-breaking groove is arranged on the upper head-changing transition ring near the machine head assembly part.

[0010] Preferably, an upper wire hook is also provided on the upper head-changing transition ring, and the upper wire hook is arranged on an end of the upper head-changing transition ring which is different from the machine head assembly part.

[0011] Preferably, the upper head-changing transition ring is also provided with an upper head-changing piston chamber and a transition ring air channel, and the transition ring air channel runs through to the upper head-changing piston chamber.

[0012] Preferably, an upper head-changing piston rod and an upper head-changing elastic member are arranged in the upper head-changing piston chamber, and an upper head-changing cylinder cover is arranged at the opening of the upper head-changing piston chamber.

[0013] Preferably, the number of the upper head-changing piston chamber and the number of the centrifugal yarn-pushing channels are both 6; the upper head-changing piston chamber and the centrifugal yarn-pushing channels are evenly spaced and arranged on the circumference of the transition ring chamber.

[0014] Preferably, the cutting-free upper head-changing transition ring mechanism capable of automatically pushing out a full circle of yarn also includes an end cover, which is arranged at the outer end of the transition ring cavity.

[0015] Preferably, the cutting-free upper head-changing transition ring mechanism capable of automatically pushing out a full circle of yarn also includes a buffer component, which is arranged on the end cover and located in the transition ring cavity.

[0016] Preferably, the transition ring cavity comprises an axial hole section, a buffer section and a cavity section arranged between the axial hole section and the buffer section.

[0017] Preferably, a positioning retaining ring is provided between the shaft hole section and the cavity section, and the positioning retaining ring is used to limit the movement range of the piston rod.

[0018] Preferably, a retaining ring is further provided on the positioning retaining ring, and the retaining ring is used to prevent rigid fit between components.

[0019] Preferably, the cutting-free upper head-changing transition ring mechanism capable of automatically pushing out a full circle of yarn also includes a yarn pushing mechanism, which includes a yarn pushing piston rod, a yarn pushing seat, and a centrifugal yarn pushing rod; the yarn pushing seat is arranged in the transition ring cavity, the centrifugal yarn pushing rod is hinged on the yarn pushing seat and is located in the centrifugal yarn pushing channel, and the yarn pushing piston rod passes through the axial hole section and is connected to the side of the yarn pushing seat that is different from the centrifugal yarn pushing rod.

[0020] Preferably, the yarn pushing mechanism further comprises a yarn pushing reset member; the yarn pushing piston rod comprises a piston portion and a push rod portion; both ends of the push rod portion are respectively connected to the yarn pushing seat and the piston portion; the yarn pushing reset member is arranged between the piston portion and the yarn pushing seat.

[0021] Preferably, the yarn pushing piston rod further comprises a buffer head, and the buffer head and the push rod part are respectively located on both sides of the piston part.

[0022] Preferably, the yarn pushing mechanism further comprises a buffer; the buffer is arranged on the yarn pushing piston rod and / or the yarn pushing seat.

[0023] Preferably, the centrifugal yarn pushing rod comprises a hinge hole, a yarn pushing portion, and a buffer portion; the yarn pushing portion and the buffer portion are respectively located on both sides of the hinge hole.

[0024] Beneficial technical effects:

[0025] The present application discloses a cutting-free upper head-changing transition ring mechanism capable of automatically pushing out a whole circle of yarn. Through cooperation with the machine head main shaft, it can not only automatically complete the head-loading and head-changing operations of the wire drawing machine, but also automatically process the transition yarn formed during the head-loading and head-changing process, which is beneficial to reducing labor intensity, increasing the degree of automation, and improving the safety of human-machine cooperation; at the same time, the entire circle of transition yarn can be recycled to increase the recycling value of the transition yarn and prevent the environment from being polluted by broken wool yarn.

[0026] The technical solution and technical effects of the present application are described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 : Front view of the cutting-free upper yarn transition ring mechanism that can automatically push out a full circle of yarn;

[0028] Figure 2 : Figure 1 Middle AA section;

[0029] Figure 3 : Figure 1 Middle BB section;

[0030] Figure 4 : Schematic diagram of the yarn pushing mechanism structure;

[0031] Figure 5 : Assembly diagram of the cutting-free upper transition ring mechanism that can automatically push out a full circle of yarn;

[0032] Icon Description:

[0033] 10- Upper head change transition ring;

[0034] 110 - Transition slope;

[0035] 120-transition ring cavity; 1210-shaft hole section, 1220-buffer section, 1230-cavity section, 1240-retaining ring, 1250-retaining ring;

[0036] 130-centrifugal yarn pushing channel;

[0037] 140-head assembly department;

[0038] 150-yarn breaking slot;

[0039] 160- upper wire hook;

[0040] 170-upper head change piston chamber;

[0041] 180-transition ring airway;

[0042] 20-upper head replacement piston rod;

[0043] 30-Replace the cylinder head;

[0044] 40- upper head changing elastic member;

[0045] 50-end cover;

[0046] 60- buffer component;

[0047] 70-yarn pushing mechanism;

[0048] 710-piston rod, 720-yarn pushing seat, 730-centrifugal yarn pushing rod, 740-yarn pushing reset member, 750-buffer;

[0049] 7110-piston part, 7120-push rod part, 7130-buffer head;

[0050] 7310-hinge hole, 7320-yarn pushing part, 7330-buffer part. DETAILED DESCRIPTION

[0051] Terminology: The existing wire drawing machine generally includes a wire drawing machine frame, a head turntable and two heads arranged on the head turntable (please refer to the patent: Slow-pull automatic head-on online cut-free yarn transition yarn feeding mechanism / 201922235065.5 Figure 1 ). The machine head includes a machine head spindle. When winding, first fix the yarn tube on the machine head spindle, then connect the glass fiber to the yarn tube, and the machine head spindle rotates to wind the glass fiber onto the yarn tube to form a yarn ball or yarn cake. When the yarn tube being wound is full of glass fiber (full tube), the machine head turntable rotates to replace the yarn tube that has not been wound (empty tube) to the winding position to continue winding. The yarn ball or yarn cake after the full tube is removed by a robot or manually to enter the next process.

[0052] The process of connecting the glass fiber to the empty yarn tube at the beginning is called head-on in this application, and the process of exchanging the positions of the empty tube and the full tube by rotating the head turntable is called head changing or tube changing in this application. The head changing in this application refers to the two processes of head-on and head changing.

[0053] When the empty bobbin is wound, the yarn is wound on the upper wire ring by a V-shaped groove and a wire hook or an upper wire ring with a threaded groove and a wire hook in the prior art, and then the glass fiber is pushed to the winding area of ​​the winding bobbin by a wire push rod. During the winding process, part of the transition yarn will be formed on the upper wire ring due to the continuous rotation of the main shaft of the machine head, and there will be a connection line between the transition yarn and the finished yarn ball.

[0054] See also Figure 1-Figure 5 The present application discloses a cutting-free upper head-changing transition ring mechanism capable of automatically pushing out a full circle of yarn, comprising an upper head-changing transition ring 10, on which a transition slope 110, a transition ring cavity 120, and a centrifugal yarn pushing channel 130 are provided; the transition slope 110 is arranged on the outer circumference of the upper head-changing transition ring 10, the transition ring cavity 120 passes through the upper head-changing transition ring 10, and the centrifugal yarn pushing channel 130 is arranged on the cavity of the transition ring cavity 120 and extends to the transition slope 110.

[0055] The transition ring cavity 120 includes an axial hole section 1210, a buffer section 1220, and a cavity section 1230 disposed between the axial hole section 1210 and the buffer section 1220. A positioning retaining ring 1240 is disposed between the axial hole section 1210 and the cavity section 1230. The positioning retaining ring 1240 is used to limit the range of motion of the piston rod. In order to avoid rigid fit between the components, a retaining ring 1250 is also disposed on the positioning retaining ring 1240.

[0056] The upper head-changing transition ring 10 is also provided with a head assembly part 140, a yarn-breaking groove 150, and a wire hook 160. The head assembly part 140 is arranged at one end of the upper head-changing transition ring 10 where the shaft hole section 1210 is located, and is used to assemble the upper head-changing transition ring 10 to the head main shaft of the wire drawing machine. The yarn-breaking groove 150 is arranged at a position on the upper head-changing transition ring 10 close to the head assembly part 140, and is used to cooperate with other parts or components to cut the yarn. The wire hook 160 is arranged on the end of the upper head-changing transition ring 10 different from the head assembly part 140, and is used to hook the glass fiber to complete the head-up action.

[0057] The upper head-changing transition ring 10 is also provided with an upper head-changing piston chamber 170 and a transition ring air passage 180. The transition ring air passage 180 is connected to the upper head-changing piston chamber 170. The upper head-changing piston rod 20 and the upper head-changing elastic member 40 are assembled in the upper head-changing piston chamber 170, and the upper head-changing cylinder cover 30 is arranged at the opening of the upper head-changing piston chamber 170.

[0058] The upper head-changing elastic member 40 is a spring or a spring sheet that rests against the upper head-changing piston rod 20 and the upper head-changing piston chamber 170. The upper head-changing piston rod 20 can be retracted into the upper head-changing piston chamber 170 under the action of compressed air. After the compressed air is cut off, the upper head-changing piston rod 20 can extend out of the upper head-changing piston chamber 170 under the action of the upper head-changing elastic member 40.

[0059] The number of the upper head-changing piston chambers 170 and the number of the centrifugal yarn-pushing channels 130 are both 6; the upper head-changing piston chambers 170 and the centrifugal yarn-pushing channels 130 are evenly spaced and arranged on the circumference of the transition ring chamber 120.

[0060] The end cover 50 is disposed on the transition annular cavity 120 at one end where the buffer section 1220 is located. The buffer component 60 is disposed on the end cover 50 and is located in the transition annular cavity 120 .

[0061] The yarn pushing mechanism 70 includes a yarn pushing piston rod 710 , a yarn pushing seat 720 , a centrifugal yarn pushing rod 730 , a yarn pushing reset member 740 , and a buffer 750 .

[0062] The yarn pushing piston rod 710 comprises a piston portion 7110 , a push rod portion 7120 , and a buffer head 7130 ; the buffer head 7130 and the push rod portion 7120 are respectively located on both sides of the piston portion 7110 .

[0063] The yarn pushing seat 720 is arranged in the transition ring cavity 120, and one end of the push rod portion 7120 passes through the shaft hole section 1210 and is fixedly connected to the yarn pushing seat 720. The yarn pushing piston rod 710 can perform linear telescopic motion along the axial direction of the shaft hole section 1210. The piston portion 7110 can limit the motion range of the piston rod 710 under the action of the positioning stop ring 1240 and / or the stop ring 1250. The yarn pushing reset member 740 is arranged between the piston portion 7110 and the positioning stop ring 1240 or the stop ring 1250, and can be a spring and / or a spring sheet. When the piston portion 7110 of the active yarn pushing piston rod 710 compresses the yarn pushing reset member 740 axially, the yarn pushing reset member 740 can generate an elastic force to reset the yarn pushing piston rod 710.

[0064] The buffer 750 is disposed on the end of the yarn pushing piston rod 710 and / or the yarn pushing seat 720 , and its orientation is substantially aligned with the buffer component 60 .

[0065] The centrifugal yarn pushing rod 730 includes a hinge hole 7310, a yarn pushing portion 7320, and a buffer portion 7330; the yarn pushing portion 7320 and the buffer portion 7330 are respectively located on both sides of the hinge hole 7310. The hinge hole 7310 is used to assemble the centrifugal yarn pushing rod 730 to the yarn pushing seat 720. The yarn pushing portion 7320 is a long lever arm, which is used to push the transition yarn; the buffer portion 7330 is a short lever arm, which is used to cooperate with the buffer component 60 to produce a buffering effect. When the buffer portion 7330 contacts the buffer component 60, it can rotate under the action of the buffer component 60 to avoid the movement path of the empty yarn ball or yarn tube.

[0066] Application description: A piston chamber for accommodating a yarn pushing piston rod 710 and a corresponding air path are provided on the head spindle of the wire drawing machine, and the yarn pushing piston rod 710 is assembled into the piston chamber, and then the upper head changing transition ring 10 is fixed on the head spindle, so that the functions of automatic upper head changing, yarn cutting and pushing out transition yarn of the wire drawing machine can be automatically completed.

[0067] The preferred configuration of the machine head main shaft is: a yarn pushing piston chamber for assembling the yarn pushing piston rod 710, as well as a main air channel and a bypass air channel are provided on the machine head main shaft. The main air channel is connected to the yarn pushing piston chamber and a main air hole is formed between the main air channel and the yarn pushing piston chamber, and the bypass air channel is connected to the yarn pushing piston chamber and an auxiliary air hole is formed between the yarn pushing piston chamber, and a flow limiting valve is provided in the auxiliary air hole. The bypass air channel is also connected to the upper head changing piston chamber 170. The yarn pushing piston rod 710 is assembled in the yarn pushing piston chamber, and the upper head changing transition ring 10 is fixedly assembled at the front end of the machine head main shaft, i.e., the opening part of the yarn pushing piston chamber. The buffer head 7130 of the centrifugal yarn pushing rod 710 can disconnect or conduct the main air hole with the axial movement of the yarn pushing piston rod 710. The control method is:

[0068] In the head-up step, the compressed air is cut off, the upper head-changing piston rod extends, the centrifugal yarn-pushing rod is retracted along with the yarn-pushing piston rod, the main shaft of the wire drawing machine head rotates and swings, and the glass fiber enters the upper head-changing piston rod and the upper wire hook. After the yarn is hooked, it immediately enters the winding area for wire drawing and winding;

[0069] In the head changing step, when the drum is full, the glass fiber yarn is pushed onto the upper head changing transition ring, the full drum head and the empty head start to switch positions, and the glass fiber yarn enters the upper head changing piston rod and the upper wire hook of the empty head. After the yarn is hooked, it enters the winding area to continue drawing and winding;

[0070] In the yarn pushing step, the compressed air is turned on, and before the yarn pushing piston rod extends out of the yarn pushing piston chamber, the upper head changing piston rod retracts into the upper head changing piston chamber, and at the same time compresses the upper head changing reset part; then, the yarn pushing piston rod extends out of the yarn pushing piston chamber, and the centrifugal yarn pushing rod moves along the centrifugal yarn pushing channel to push the transition yarn down the transition slope, and at the same time compresses the yarn pushing reset part; when the yarn pushing piston rod is pushed out to the end of the stroke, the buffer contacts the vibration reduction component to buffer and decelerate, and at the same time, the centrifugal yarn pushing rod is affected by the vibration reduction component to tilt and rotate;

[0071] The reset step is to cut off the compressed air, and the upper head changing piston rod extends out of the upper head changing piston chamber under the action of the upper head changing reset part; the yarn pushing piston rod retracts into the yarn pushing piston chamber under the action of the yarn pushing reset part, and the centrifugal yarn pushing rod rotates centrifugally vertically as the machine head rotates after the yarn pushing piston rod is reset; when the yarn pushing piston rod is reset and retracted into the yarn pushing piston chamber, the buffer head blocks the main air hole, and the remaining air is discharged through the flow limiting valve in the bypass airway as a deceleration buffer.

[0072] The technical scheme and technical effects of the present application are described in detail above in combination with the drawings and specific embodiments of the specification. It should be noted that technicians in this field can also develop other embodiments on this basis; any simple deformation and equivalent substitution that does not deviate from the innovative concept of the present application are covered by the present application and belong to the scope of protection of this patent.

Claims

1. A cutting-free upper yarn transition ring mechanism capable of automatically pushing out a full circle of yarn, characterized in that: It includes an upper head-changing transition ring (10); The upper head-changing transition ring (10) is provided with a transition slope (110), a transition ring cavity (120), and a centrifugal yarn pushing channel (130); The transition slope (110) is arranged on the outer circumference of the upper head-changing transition ring (10), the transition ring cavity (120) passes through the upper head-changing transition ring (10), and the centrifugal yarn pushing channel (130) is arranged on the cavity body of the transition ring cavity (120) and extends to the transition slope (110); The upper head-changing transition ring (10) is also provided with a head assembly portion (140) and a yarn-breaking groove (150); The die assembly portion (140) is arranged at one end of the upper die-changing transition ring (10) and is used to assemble the upper die-changing transition ring (10) onto the die main shaft of the wire drawing machine; The yarn breaking groove (150) is arranged on the upper head-changing transition ring (10) at a position close to the machine head assembly portion (140); The upper head-changing transition ring (10) is also provided with an upper head-changing piston chamber (170) and a transition ring air channel (180), and the transition ring air channel (180) is connected to the upper head-changing piston chamber (170).

2. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 1, characterized in that: An upper wire hook (160) is also provided on the upper head-changing transition ring (10), and the upper wire hook (160) is provided on an end of the upper head-changing transition ring (10) that is different from the machine head assembly portion (140).

3. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 1, characterized in that: An upper head-changing piston rod (20) and an upper head-changing elastic member (40) are arranged in the upper head-changing piston chamber (170), and an upper head-changing cylinder cover (30) is arranged at the opening of the upper head-changing piston chamber (170).

4. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 1, characterized in that: The number of the upper head-changing piston chambers (170) and the number of the centrifugal yarn-pushing channels (130) are both 6; the upper head-changing piston chambers (170) and the centrifugal yarn-pushing channels (130) are evenly spaced and arranged on the circumference of the transition ring chamber (120).

5. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 1, characterized in that: The cutting-free upper transition ring mechanism capable of automatically pushing out a full circle of yarn further comprises an end cover (50), wherein the end cover (50) is arranged at the end of the transition ring cavity (120).

6. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 5, characterized in that: The cutting-free upper head-changing transition ring mechanism capable of automatically pushing out a full circle of yarn further comprises a buffer component (60), wherein the buffer component (60) is arranged on the end cover (50) and is located in the transition ring cavity (120).

7. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 1, characterized in that: The transition annular cavity (120) comprises an axial hole section (1210), a buffer section (1220), and a cavity section (1230) arranged between the axial hole section (1210) and the buffer section (1220).

8. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 7, characterized in that: A positioning retaining ring (1240) is provided between the shaft hole section (1210) and the cavity section (1230), and the positioning retaining ring (1240) is used to limit the movement range of the piston rod.

9. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 8, characterized in that: A retaining ring (1250) is also provided on the positioning retaining ring (1240).

10. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to any one of claims 1 to 9, characterized in that: The cutting-free upper head-changing transition ring mechanism capable of automatically pushing out a full circle of yarn also includes a yarn pushing mechanism (70), wherein the yarn pushing mechanism (70) includes a yarn pushing piston rod (710), a yarn pushing seat (720), and a centrifugal yarn pushing rod (730); The yarn pushing seat (720) is arranged in the transition annular cavity (120), the centrifugal yarn pushing rod (730) is hinged on the yarn pushing seat (720) and is located in the centrifugal yarn pushing channel (130), and the yarn pushing piston rod (710) is connected to the side of the yarn pushing seat (720) different from the centrifugal yarn pushing rod (730).

11. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 10, characterized in that: The yarn pushing mechanism (70) further comprises a yarn pushing resetting member (740); The yarn pushing piston rod (710) comprises a piston portion (7110) and a push rod portion (7120); The two ends of the push rod part (7120) are respectively connected to the yarn pushing seat (720) and the piston part (7110); The yarn pushing resetting member (740) is arranged between the piston portion (7110) and the yarn pushing seat (720).

12. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 11, characterized in that: The yarn pushing piston rod (710) further comprises a buffer head (7130), wherein the buffer head (7130) and the push rod portion (7120) are respectively located on two sides of the piston portion (7110).

13. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 10, characterized in that: The yarn pushing mechanism (70) further includes a buffer (750); The buffer (750) is arranged on the yarn pushing piston rod (710) and / or the yarn pushing seat (720).

14. The cutting-free upper yarn-changing transition ring mechanism capable of automatically pushing out a full circle of yarn according to claim 10, characterized in that: The centrifugal yarn pushing rod (730) comprises a hinge hole (7310), a yarn pushing portion (7320), and a buffer portion (7330); The yarn pushing portion (7320) and the buffer portion (7330) are respectively located on both sides of the hinge hole (7310).

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