阅读说明：本技术 一种恒定张力送纱器 (Constant tension yarn feeder ) 是由 陈利 赵世波 张一帆 焦亚男 孙颖 姜茜 于 2021-07-19 设计创作，主要内容包括：本发明公开了一种恒定张力送纱器,包括固定侧支板、左滑块、右滑块、第一导纱轴、第二导纱轴、第三导纱轴、固定横板、止回棘爪、棘轮、面板、扭力弹簧、线轴、线轴外侧轴套、左导向轴、右导向轴、主体支座、第一销钉、第二销钉和棘轮轴。本发明无需电机输出动力,依靠棘轮、止回棘爪和扭力弹簧的配合来控制线轴转速,线轴转速稳定,降低运动惯性,减少外界牵引引起的张力波动；再配合两个固定导纱轴和一个活动导纱轴的送纱路径,实现恒定张力稳定送纱,不需要电机控制送纱张力。(The invention discloses a constant-tension yarn feeder which comprises a fixed side supporting plate, a left sliding block, a right sliding block, a first yarn guide shaft, a second yarn guide shaft, a third yarn guide shaft, a fixed transverse plate, a non-return pawl, a ratchet wheel, a panel, a torsion spring, a bobbin outer side shaft sleeve, a left guide shaft, a right guide shaft, a main body support, a first pin, a second pin and a ratchet wheel shaft. The invention does not need the motor to output power, and controls the rotating speed of the spool by the matching of the ratchet wheel, the non-return pawl and the torsion spring, so that the rotating speed of the spool is stable, the motion inertia is reduced, and the tension fluctuation caused by external traction is reduced; and the yarn feeding path of the two fixed yarn guide shafts and the movable yarn guide shaft is matched to realize stable yarn feeding with constant tension without controlling the yarn feeding tension by a motor.)

1. A constant tension yarn feeder is characterized by comprising a fixed side support plate, a left slide block, a right slide block, a first yarn guide shaft, a second yarn guide shaft, a third yarn guide shaft, a fixed transverse plate, a non-return pawl, a ratchet wheel, a panel, a torsion spring, a bobbin outer side shaft sleeve, a left guide shaft, a right guide shaft, a main body support, a first pin, a second pin and a ratchet wheel shaft;

two ends of the fixed transverse plate are respectively fixed on the fixed side support plate and the main body support; the left guide shaft is fixed on the left side of the fixed transverse plate; the right guide shaft is fixed on the right side of the fixed transverse plate; the left sliding block is slidably arranged on the left guide shaft; the right sliding block is slidably arranged on the right guide shaft;

one end of the first yarn guide shaft is rotatably arranged on the fixed side support plate, and the other end of the first yarn guide shaft is rotatably arranged on the main body support; one end of the second yarn guide shaft is rotatably arranged on the fixed side support plate, and the other end of the second yarn guide shaft is rotatably arranged on the main body support; one end of the third yarn guide shaft is rotatably arranged on the left sliding block, and the other end of the third yarn guide shaft is rotatably arranged on the right sliding block;

one end of the ratchet shaft rotates or is fixed on the main body support, and the other end of the ratchet shaft is fixed with a shaft sleeve outside the spool; the bobbin is rotationally connected with the ratchet shaft, and a shaft sleeve outside the bobbin is used for axially positioning the bobbin; the ratchet wheel is rotatably arranged on the ratchet wheel shaft; the ratchet wheel is fixedly connected with the spool;

the panel is fixed on the main body support; two ends of the first pin and the second pin are respectively fixed on the panel and the main body support; one end of the non-return pawl is hinged to the second pin, the bulge in the middle of the non-return pawl is matched with the one-way tooth groove of the ratchet wheel, the function of the ratchet wheel mechanism is realized, and the other end of the non-return pawl is used for being operated by a user; the torsion spring is nested on the second pin, one end of the torsion spring is fixedly connected with the first pin, and the other end of the torsion spring is fixedly connected with the middle bulge of the non-return pawl.

2. The constant tension yarn feeder of claim 1, wherein the one-way tooth grooves are opened on outer surfaces of side surfaces of the ratchet wheel, and a projection is provided on one bottom surface of the ratchet wheel; the outer surface of one end of the spool is provided with a groove which is matched with the convex block of the ratchet wheel to realize the detachable fixed connection of the spool and the ratchet wheel and realize the synchronous movement of the spool and the ratchet wheel.

3. A constant tension yarn feeder as claimed in claim 1 or 2, wherein both ends of the bobbin are circular plates, one of the circular plates having a groove formed on an outer surface thereof.

4. A constant tension yarn feeder as in claim 1, further comprising a first spool bushing and a second spool bushing; the spool is rotatably connected with the ratchet shaft through the first spool shaft sleeve and the second spool shaft sleeve.

5. The constant tension yarn feeder of claim 1, wherein the backstop pawl, the ratchet wheel and the torsion spring are located between the face plate and the main body support to protect the components and ensure the effectiveness of the movement.

Technical Field

The invention relates to the technical field of spinning, in particular to a constant-tension yarn feeder.

Background

The realization of good unwinding and yarn feeding of the fiber bundle is the first step in the preparation of the preform, and the continuous and stable yarn feeding is beneficial to the forming and weaving of the preform. Constant tension yarn feeding is the first step of weaving requirements, and tension fluctuation in the yarn feeding process can cause difficulty in subsequent weaving, so that the formability of a preform is poor. The document of application No. 201620597091.6 discloses a constant tension yarn feeder that can feed yarn with constant tension according to the deformation of a sensing elastic piece and the change of the resistance of a strain gauge and an overfeed motor. The document No. 201710741329.7 discloses an automatic yarn feeder, in which a driving device is a brushless dc motor with an outer rotor, a rotor is provided on a stator shaft, and the yarn feeder is driven by the rotor to realize a yarn feeding function. However, both of the above documents need to control yarn feeding by matching with a motor, and there is no need to realize constant yarn feeding tension by manual adjustment, which is the first step of yarn feeding tension control.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to solve the technical problem of providing a constant-tension yarn feeder.

The invention provides a constant tension yarn feeder, which is characterized by comprising a fixed side support plate, a left slide block, a right slide block, a first yarn guide shaft, a second yarn guide shaft, a third yarn guide shaft, a fixed transverse plate, a non-return pawl, a ratchet wheel, a panel, a torsion spring, a bobbin outer side shaft sleeve, a left guide shaft, a right guide shaft, a main body support, a first pin, a second pin and a ratchet wheel shaft;

two ends of the fixed transverse plate are respectively fixed on the fixed side support plate and the main body support; the left guide shaft is fixed on the left side of the fixed transverse plate; the right guide shaft is fixed on the right side of the fixed transverse plate; the left sliding block is slidably arranged on the left guide shaft; the right sliding block is slidably arranged on the right guide shaft;

one end of the first yarn guide shaft is rotatably arranged on the fixed side support plate, and the other end of the first yarn guide shaft is rotatably arranged on the main body support; one end of the second yarn guide shaft is rotatably arranged on the fixed side support plate, and the other end of the second yarn guide shaft is rotatably arranged on the main body support; one end of the third yarn guide shaft is rotatably arranged on the left sliding block, and the other end of the third yarn guide shaft is rotatably arranged on the right sliding block;

one end of the ratchet shaft rotates or is fixed on the main body support, and the other end of the ratchet shaft is fixed with a shaft sleeve outside the spool; the bobbin is rotationally connected with the ratchet shaft, and a shaft sleeve outside the bobbin is used for axially positioning the bobbin; the ratchet wheel is rotatably arranged on the ratchet wheel shaft; the ratchet wheel is fixedly connected with the spool;

the panel is fixed on the main body support; two ends of the first pin and the second pin are respectively fixed on the panel and the main body support; one end of the non-return pawl is hinged to the second pin, the bulge in the middle of the non-return pawl is matched with the one-way tooth groove of the ratchet wheel, the function of the ratchet wheel mechanism is realized, and the other end of the non-return pawl is used for being operated by a user; the torsion spring is nested on the second pin, one end of the torsion spring is fixedly connected with the first pin, and the other end of the torsion spring is fixedly connected with the middle bulge of the non-return pawl.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention does not need the motor to output power, and controls the rotating speed of the spool by the matching of the ratchet wheel, the non-return pawl and the torsion spring, so that the rotating speed of the spool is stable, the motion inertia is reduced, and the tension fluctuation caused by external traction is reduced; and the yarn feeding path of the two fixed yarn guide shafts and the movable yarn guide shaft is matched to realize stable yarn feeding with constant tension without controlling the yarn feeding tension by a motor.

(2) The third yarn guide shaft is influenced by the change of yarn feeding tension, the vertical position of the third yarn guide shaft can be automatically adaptively changed, the relative position change between the third yarn guide shaft and the first yarn guide shaft and between the third yarn guide shaft and the second yarn guide shaft changes a yarn feeding path and influences the size of the yarn feeding tension, and the yarn feeding tension is stabilized.

(3) The invention has simple structure, convenient maintenance, electric power saving and low cost; the device has the advantages of quick assembly, strong adaptability, strong operability and strong adjustability; the yarn reversing frame can be independently placed and can be matched with a yarn reversing frame for use, so that the practicability is high; the method is beneficial to the stable and continuous actual production requirement, and is suitable for weaving high-performance fiber preforms such as carbon fibers.

Drawings

FIG. 1 is a perspective view of the overall structure of the present invention;

FIG. 2 is a front elevational view of the overall construction of the present invention with the bobbin and faceplate removed;

FIG. 3 is a front elevational view of the overall construction of the present invention with the spool, ratchet shaft and face plate removed;

FIG. 4 is a sectional view taken along line A-A of FIG. 3 in accordance with the present invention;

FIG. 5 is a sectional view taken along line B-B of FIG. 3 in accordance with the present invention;

FIG. 6 is a front view of the ratchet shaft and other parts arrangement of the present invention;

FIG. 7 is a perspective view of the ratchet of the present invention;

fig. 8 is a perspective view of the spool of the present invention.

In the figure, a fixed side support plate 1, a left slide block 2, a right slide block 3, a first yarn guide shaft 4, a second yarn guide shaft 5, a third yarn guide shaft 6, a fixed transverse plate 7, a non-return pawl 8, a ratchet wheel 9, a panel 10, a torsion spring 11, a bobbin 12, a fastening screw 13, a bobbin outer side shaft sleeve 14, a left guide shaft 15, a right guide shaft 16, a main body support 17, a first pin 18, a second pin 19, a first bobbin shaft sleeve 20, a second bobbin shaft sleeve 21, a ratchet wheel shaft 22, a first bearing 23, a second bearing 24, a third bearing 25, a fourth bearing 26, a fifth bearing 27, a sixth bearing 28, a seventh bearing 29, a unidirectional tooth groove 901, a convex block 902 and a concave groove 1201 are arranged.

Detailed Description

Specific examples of the present invention are given below. The specific examples are only intended to illustrate the invention in further detail and do not limit the scope of protection of the claims of the present application.

The invention provides a constant-tension yarn feeder (a yarn feeder for short), which is characterized by comprising a fixed side support plate 1, a left slide block 2, a right slide block 3, a first yarn guide shaft 4, a second yarn guide shaft 5, a third yarn guide shaft 6, a fixed transverse plate 7, a non-return pawl 8, a ratchet wheel 9, a panel 10, a torsion spring 11, a bobbin 12, a bobbin outer side shaft sleeve 14, a left guide shaft 15, a right guide shaft 16, a main body support 17, a first pin 18, a second pin 19, a first bobbin shaft sleeve 20, a second bobbin shaft sleeve 21 and a ratchet wheel shaft 22;

two ends of the fixed transverse plate 7 are respectively fixed on the fixed side support plate 1 and the main body support 17 through bolts and nuts; the left guide shaft 15 is fixed on the left side of the fixed transverse plate 7 through a screw; the right guide shaft 16 is fixed on the right side of the fixed transverse plate 7 through a screw; the left slide block 2 is arranged on the left guide shaft 15 in a sliding way; the right sliding block 3 is arranged on the right guide shaft 16 in a sliding way;

one end of the first yarn guide shaft 4 is rotatably arranged on the fixed side support plate 1 through a first bearing 23, and the other end of the first yarn guide shaft is rotatably arranged on the main body support seat 17 through a second bearing 24; one end of the second yarn guide shaft 5 is rotatably arranged on the fixed side support plate 1 through a third bearing 25, and the other end of the second yarn guide shaft is rotatably arranged on the main body support seat 17 through a fourth bearing 26; one end of the third yarn guide shaft 6 is rotatably arranged on the left sliding block 2 through a fifth bearing 27, and the other end of the third yarn guide shaft is rotatably arranged on the right sliding block 3 through a sixth bearing 28;

one end of the ratchet shaft 22 passes through the center of the ratchet 9 to rotate or is fixedly arranged on the main body support 17, and the other end is fixed with a spool outer side shaft sleeve 14 through a fastening screw 13; the spool 12 is rotationally connected with the ratchet shaft 22, and the spool outer shaft sleeve 14 is used for axially positioning the spool 12; the ratchet wheel 9 is rotatably arranged on a ratchet wheel shaft 22 through a bearing; the ratchet wheel 9 is fixedly connected with the spool 12;

the panel 10 is fixed on the main body support 17; both ends of the first pin 18 and the second pin 19 are respectively fixed on the panel 10 and the main body support 17; one end of the non-return pawl 8 is hinged on the second pin 19, the bulge in the middle part is matched with the one-way tooth groove 901 of the ratchet wheel 9 to realize the function of a ratchet wheel mechanism, and the other end is used for the operation of a user; the torsion spring 11 is nested on the second pin 19, one end of the torsion spring is fixedly connected with the first pin 18, and the other end of the torsion spring is fixedly connected with the middle bulge of the non-return pawl 8.

Preferably, the one-way tooth slot 901 is formed on the outer surface of the side surface of the ratchet wheel 9, and a projection 902 is arranged on one bottom surface of the ratchet wheel 9; the outer surface of one end of the spool 12 is provided with a groove 1201 which is matched with a lug 902 of the ratchet 9 to realize the detachable fixed connection of the spool 12 and the ratchet 9 and realize the synchronous movement of the spool 12 and the ratchet 9.

Preferably, both ends of the bobbin 12 are circular plates, and a groove 1201 is formed on the outer surface of one circular plate.

Preferably, the yarn feeder further comprises a first bobbin housing 20 and a second bobbin housing 21; the spool 12 is rotatably connected to a ratchet shaft 22 by a first spool hub 20 and a second spool hub 21.

Preferably, one end of the ratchet shaft 22 is rotatably mounted on the main body support 17 through a bearing seven 29, so that relative rotation of the spool 12 and the ratchet shaft 22 during yarn feeding is reduced, and the service life of the first spool sleeve 20 and the second spool sleeve 21 is prolonged.

Preferably, the non-return pawl 8, the ratchet 9 and the torsion spring 11 are located between the face plate 10 and the body seat 17, constituting a protection for the components and ensuring the effectiveness of the movement.

The working principle and the working process of the invention are as follows:

a yarn drum is fixedly placed on a spool 12, a yarn feeding process is started, and yarns of the yarn drum sequentially pass through a first yarn guide shaft 4, a third yarn guide shaft 6 and a second yarn guide shaft 5 and then are guided out; the traction force generated in the weaving process drives the yarn to continuously move, the moving yarn drives the bobbin 12 to continuously rotate, and the rotating speed of the bobbin 12 is the yarn feeding speed; the spool 12 drives the ratchet wheel 9 to rotate, the ratchet wheel 9 rotates to enable the protrusion of the non-return pawl 8 to slide out of one unidirectional tooth socket 901 of the ratchet wheel 9 to the adjacent tooth back, and at the moment, the non-return pawl 8 generates potential energy due to position change and converts the potential energy into the elastic potential energy of the torsion spring 11; the ratchet wheel 9 continues to rotate, the protrusion of the non-return pawl 8 enters the next one-way tooth groove 901 of the ratchet wheel 9 from the tooth back due to the elastic potential energy of the torsion spring 11, and the spool 12 can only move in one way towards the traction force end due to the nesting effect of the protrusion of the non-return pawl 8 and the one-way tooth groove 901 of the ratchet wheel 9, so that the reciprocating circulation is realized;

in the yarn feeding process, the yarn tension can rapidly and circularly fluctuate from big to small:

when the yarn tension between the traction force end and the third yarn rewinding shaft 6 is increased, the position of the third yarn rewinding shaft 6 is raised, the left sliding block 2 is vertically raised along the left guide shaft 15 and the right sliding block 3 is vertically raised along the right guide shaft 16 at the same time, and the gravitational potential energy is stored; when the protrusion of the non-return pawl 8 rises from the one-way tooth socket 901 of the ratchet wheel 9 to the adjacent tooth back, the yarn between the third yarn pouring shaft 6 and the spool 12 is in a phase of being subjected to larger tension, and the position of the third yarn pouring shaft 6 has a tendency of rising continuously; when the protrusion of the non-return pawl 8 falls from the back of the teeth of the ratchet wheel 9 to the adjacent one-way tooth slot 901 position, the yarn tension between the third yarn pouring shaft 6 and the spool 12 becomes smaller, and the third yarn pouring shaft 6 tends to automatically adjust to a proper position, so that the yarn tension is stabilized.

When the yarn tension between the traction force end and the third yarn rewinding shaft 6 is reduced, the position of the third yarn rewinding shaft 6 is lowered, and the left sliding block 2 is vertically lowered along the left guide shaft 15 and the right sliding block 3 is vertically lowered along the right guide shaft 16 simultaneously; when the bulge of the non-return pawl 8 falls into the adjacent one-way tooth groove 901 from the tooth back of the ratchet wheel 9, the yarn tension is reduced, and the position of the third yarn reversing shaft 6 tends to be reduced continuously; when the protrusion of the non-return pawl 8 rises from the one-way tooth slot 901 of the ratchet wheel 9 to the adjacent tooth back, the yarn between the third yarn pouring shaft 6 and the spool 12 is in a stage of being subjected to a larger tension, and the third yarn pouring shaft 6 tends to automatically adjust to a proper position, so that the yarn tension is stabilized.

Nothing in this specification is said to apply to the prior art.