CN210868769U

CN210868769U - Take-up structure of pay-off box of grass trimmer

Info

Publication number: CN210868769U
Application number: CN201921116469.6U
Authority: CN
Inventors: 秦贵荣
Original assignee: Suzhou Yuyuan Machinery Co ltd
Current assignee: Suzhou Yuyuan Machinery Co ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2020-06-30
Anticipated expiration: 2029-07-17

Abstract

The utility model discloses a take-up structure of a pay-off box of a grass trimmer, which comprises a pay-off box and a wire coil arranged in the pay-off box; a support part for rotatably supporting is arranged in the pay-off box, the wire coil is matched with the support part through a shaft hole of the wire coil, a ratchet wheel assembly is arranged between the wire coil and the pay-off box, and the ratchet wheel assembly comprises an automatic pay-off assembly and a manual pay-off assembly; the wire coil is provided with the following components in coaxial relation: an inner gear ring and an outer gear ring; the automatic pay-off assembly comprises: a first spring pressing the first pawl toward the outer ring gear; the manual pay-off assembly comprises: a second spring pressing the second pawl toward the ring gear; the structure is reasonable in arrangement, the axial relative rotation is based on damping force, the friction is reduced, the paying-off moment is relieved, and the service life of the automatic paying-off device is prolonged. Simultaneously, set up two kinds of unwrapping wire structures, can provide more unwrapping wire modes, avoid automatic unwrapping wire to cause the improper problem of cooperation, improved the practicality and the job stabilization nature of structure.

Description

Take-up structure of pay-off box of grass trimmer

Technical Field

The utility model relates to a lawn mower structure field, especially a take-up structure of line box is put to machine of beating grass.

Background

Mowers, also known as weed trimmers, lawnmowers, lawn trimmers, and the like, are used mainly for operations such as lawn construction. The working head of the mower mainly comprises a motor and a mowing device, wherein the mowing device is divided into a rigid cutter head and a flexible cutting line, the cutter head mows by using a blade, the flexible cutting line mows by using cutting force generated when the cutting line rotates at high speed, the blade and the cutting line are worn after being used for a period of time, the blade can be replaced after being worn, the cutting line can be shortened after being worn, the cutting line can be effectively used only when being pulled out to a proper working length from a pay-off disc, and the cutting line can be worn faster than the blade.

In the prior art, the automatic supplement of the cutting line is usually ensured by an automatic paying-off structure, and the principle is that the cutting line is extended by centrifugal force generated by rotation of a wire disc. In the pay-off reel structure, the ratchet mechanism is used as a basis, and automatic pay-off can be realized by matching with damping force. However, in actual use, the cutting line has different wear degrees, so that the automatic line laying needs to be smoothly carried out under relatively ideal wear conditions. Moreover, the durability of the structure has a large influence on the automatic paying-off, so that the normal paying-off of the mower cannot be ensured by a simple automatic paying-off structure.

SUMMERY OF THE UTILITY MODEL

The technical scheme of the utility model is that: a take-up structure of a pay-off box of a grass trimmer comprises the pay-off box, a pay-off cover and a wire coil arranged in the pay-off box. The wire releasing box is internally provided with a supporting part for rotating and supporting, the wire coil is matched with the supporting part through a shaft hole of the wire coil, and the wire coil can rotate in the wire releasing box based on the matching.

The peripheral wall of the supporting part is provided with a pair of elastic ribs, and the outer wall of each elastic rib is provided with a first convex rib extending axially. The shaft hole of the wire coil is internally provided with a second convex rib, the elastic rib is dispersed outwards under the action of centrifugal force, and the first convex rib and the second convex rib are in friction fit to form damping to realize stable paying-off. When paying off, the elastic ribs of the supporting part are scattered outwards under the action of centrifugal force, and the first convex ribs of the elastic ribs are in friction fit with the second convex ribs in the reel shaft holes to form damping.

The terminal surface is protruding to be equipped with protruding axle under the drum, and protruding off-axial face is equipped with supplementary muscle. Correspondingly, a convex ring corresponding to the convex shaft is arranged in the pay-off cover, and the auxiliary rib is in contact fit with the upper end face of the convex ring.

The bottom surface of the pay-off box is provided with the ratchet wheel assembly, and the ratchet wheel assembly can provide one-way rotation locking for the wire coil. The ratchet wheel assembly is divided into an automatic paying-off assembly and a manual paying-off assembly, the automatic paying-off assembly is based on the matching of damping force and the ratchet wheel, and the manual paying-off assembly is realized by the mechanical transmission of the ratchet wheel.

The wire coil is provided with the following components in coaxial relation: an inner gear ring and an outer gear ring; the automatic pay-off assembly comprises: a first spring biasing the first pawl toward the outer ring gear. The manual pay-off assembly comprises: and a second spring pressing the second pawl toward the ring gear.

Further, the first pawl includes an arc-shaped claw. And a first spring is fixed on the bottom surface of the wire releasing box and presses the hook claw to the outer gear ring. When the cutting line is shortened due to abrasion, the mowing resistance is reduced, the rotating speed of the motor is accelerated, the corresponding centrifugal force is increased, the hook claw overcomes the elastic force of the first spring under the action of the centrifugal force to leave the ratchet wheel, and the wire coil automatically rotates by one tooth under the pulling of the centrifugal force of the cutting line, so that the cutting line is lengthened, and the working length of the cutting line is ensured.

Furthermore, a rotating shaft is matched in a central shaft hole of the supporting part, and the rear end of the second pawl is connected to the rotating surface of the rotating shaft; a torsion spring is arranged between the rotating shaft and the central shaft hole; an arc-shaped chute is arranged on the bottom surface of the wire releasing box; the second pawl is provided with a bulge matched with the sliding groove; the length of the sliding groove is larger than the single pitch of the inner gear ring. When the automatic paying-off structure cannot pay off normally, the rotating shaft can be twisted, and the rotating shaft drives the second pawl to displace. The second pawl can only rotate one internal tooth distance due to the limited rotation angle of the second pawl. The wire coil can be shifted forwards by an inner tooth pitch by resetting the torsion spring, so that the effect of manual wire releasing is achieved.

Furthermore, the end part of the rotating shaft is positioned outside the wire placing box, and a hexagonal surface is arranged on the end part of the rotating shaft to match with a manual wrench.

The utility model has the advantages that: the structure is reasonable in arrangement, the axial relative rotation is based on damping force, friction is reduced, the abrasion to a wire coil and a wire releasing cover due to large impact force in the moment of wire releasing is reduced, and the service life of the automatic wire releasing device is prolonged. Simultaneously, set up two kinds of unwrapping wire structures, can provide more unwrapping wire modes, avoid automatic unwrapping wire to cause the improper problem of cooperation, improved the practicality and the job stabilization nature of structure.

Drawings

The invention will be further described with reference to the following drawings and examples:

FIG. 1 is an assembly view of a line-releasing box structure of the grass trimmer;

FIG. 2 is a structural view of an automatic take-up assembly in the pay-off box;

FIG. 3 is a structural view of a manual take-up assembly in the pay-off box;

FIG. 4 is an upper structural view of the wire coil;

FIG. 5 is a view of the underside of the coil;

FIG. 6 is a view of the bottom of the pay-off box;

wherein: 1. a wire releasing box; 2. a wire releasing cover; 3. wire coils; 4. a first pawl; 5. an outer ring gear; 6. a second pawl; 7. a second pawl; 8. a hexagonal surface; 11. a support portion; 12. an elastic rib; 21. a convex ring; 31. a second rib; 32. a protruding shaft; 33. auxiliary ribs; 41. a first spring; 42. hooking claws; 61. a second spring; 62. a body; 63. a tooth head; 64. a rotating shaft; 65. a torsion spring; 66. a chute; 67. and (4) protruding.

Detailed Description

The utility model discloses a preferred embodiment:

a take-up structure of a pay-off box of a grass trimmer comprises a pay-off box 1, a pay-off cover 2 and a wire coil 3 arranged in the pay-off box. The pay-off box 1 is provided with a support portion 11 for rotatably supporting the spool 3, and the spool 3 is engaged with the support portion 11 through the shaft hole thereof, and the spool 3 can be rotated in the pay-off box 1 based on the engagement.

A pair of elastic ribs 12 are provided on the peripheral wall of the support portion 11, and the outer wall of the elastic ribs 12 has first ribs 13 extending in the axial direction. A second rib 31 is arranged in the shaft hole of the wire coil 3. When paying off, the elastic ribs 12 of the supporting part 11 are scattered outwards under the action of centrifugal force, and the first convex ribs 13 of the elastic ribs 12 are in friction fit with the second convex ribs 31 in the reel shaft holes to form damping.

The lower end surface of the wire coil 3 is convexly provided with a convex shaft 32, and the peripheral surface of the convex shaft 32 is provided with an auxiliary rib 33. Correspondingly, a convex ring 21 corresponding to the convex shaft 32 is arranged in the wire releasing cover 2, and the auxiliary rib 33 is in contact fit with the upper end surface of the convex ring 21.

The bottom surface of the pay-off box 1 is provided with the ratchet wheel assembly, and the ratchet wheel assembly can provide one-way rotation locking for the wire coil. The ratchet wheel assembly is divided into an automatic paying-off assembly and a manual paying-off assembly, the automatic paying-off assembly is based on the matching of damping force and the ratchet wheel, and the manual paying-off assembly is realized by the mechanical transmission of the ratchet wheel.

On the coil 3 are arranged in coaxial relationship: an inner gear ring 7 and an outer gear ring 5; the automatic pay-off assembly comprises: a first spring 41 pressing the first pawl 4 towards the outer ring gear 5. The manual pay-off assembly comprises: and a second spring 61 that presses the second pawl 6 toward the ring gear 7.

The first pawl 4 includes an arc-shaped catch 42. The wire releasing case 1 has a first spring 41 fixed on the bottom surface thereof, and the first spring 41 presses the hook claw 42 toward the outer ring gear 5. When the cutting line is shortened due to abrasion, the mowing resistance is reduced, the rotating speed of the motor is accelerated, the corresponding centrifugal force is increased, the hook claw overcomes the elastic force of the first spring 41 under the action of the centrifugal force to leave the ratchet wheel, and the wire coil automatically rotates by one tooth under the pulling of the centrifugal force of the cutting line, so that the cutting line is lengthened, and the working length of the cutting line is ensured.

The second pawl 6 is of a linear telescopic structure, the second pawl 6 comprises a cylindrical body 62, the rear end of the body 62 is fixed on a rotating shaft 64, the front end of the body 62 is sleeved with a second spring 61 and a tooth head 63, and the tooth head 63 is pressed on the surface of the inner gear ring 7 by the second spring 61. As the surface of the ring gear changes, the tooth heads 63 can be retracted under the deformation of the second springs 61 so as to pass over the highest point of each tooth surface in the ring gear 9.

A rotating shaft 64 is matched in a central shaft hole of the supporting part 11, and the rear end of the second pawl 6 is connected to the rotating surface of the rotating shaft; a torsion spring 65 is arranged between the rotating shaft 64 and the central shaft hole; an arc chute 66 is arranged on the bottom surface of the pay-off box 1; the second pawl 6 is provided with a bulge 67 matched with the sliding groove; the length of the slide groove 66 is greater than a single pitch on the inner ring gear. When the automatic paying-off structure cannot pay off the line normally, the rotating shaft 64 can be twisted, and the rotating shaft 64 drives the second pawl 6 to displace. The second pawl 6 can only rotate one internal tooth distance because the angle of rotation of the second pawl 6 is limited. The wire coil can be shifted forwards by an inner tooth pitch by resetting the torsion spring 65, so that the effect of manual wire releasing is achieved.

The end of the rotating shaft 64 is located outside the pay-off box 1, and a hexagonal surface 8 is arranged on the end of the rotating shaft to match with a manual wrench. The rotational position of the second pawl can be adjusted by operation of the manual wrench. After the second pawl passes one tooth, the second pawl can restore to the original position under the action of the torsion spring, and therefore, the wire coil can be pulled to pay forward.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical concepts of the present invention be covered by the claims of the present invention.

Claims

1. A wire winding structure of a wire unwinding box of a grass trimmer comprises the wire unwinding box and a wire coil arranged in the wire unwinding box; be equipped with the supporting part that is used for rotating the support in the unwrapping wire box, the drum then through its shaft hole with the supporting part cooperation sets up ratchet subassembly, its characterized in that between drum and the unwrapping wire box: the ratchet wheel assembly comprises an automatic paying-off assembly and a manual paying-off assembly; the wire coil is provided with the following components in coaxial relation: an inner gear ring and an outer gear ring; the automatic pay-off assembly comprises: a first spring that presses the first pawl toward the outer ring gear; the manual pay-off assembly includes: a second spring pressing the second pawl toward the ring gear; the central shaft hole of the supporting part is matched with a rotating shaft, and the rear end of the second pawl is connected to the rotating surface of the rotating shaft; a torsion spring is arranged between the rotating shaft and the central shaft hole; an arc-shaped chute is arranged on the bottom surface of the pay-off box; the second pawl is provided with a bulge matched with the sliding groove; the length of the sliding groove is larger than the single pitch of the inner gear ring; the tip of pivot is located outside putting the line box, and is equipped with the hexagonal face in order to cooperate manual spanner on the tip of pivot.

2. The take-up structure of the pay-off box of the grass trimmer according to claim 1, characterized in that: the second pawl comprises a cylindrical body, the rear end of the body is fixed on the rotating shaft, and the front end of the body is sleeved with the second spring and the gear head; the second spring presses the tooth head to the inner gear ring.

3. A line winding structure of a line releasing box of a grass trimmer according to claim 1 or 2, characterized in that: the first pawl comprises an arc-shaped hook claw; the first spring is fixed on the bottom surface of the pay-off box; the first spring presses the hook claw to the outer gear ring.

4. The take-up structure of the pay-off box of the grass trimmer as claimed in claim 3, wherein: the wire coil is characterized in that a pair of elastic ribs are arranged on the peripheral wall of the supporting portion, first protruding ribs extending axially are arranged on the outer walls of the elastic ribs, second protruding ribs are arranged in the shaft holes of the wire coil, the elastic ribs are scattered outwards under the action of centrifugal force, and the first protruding ribs and the second protruding ribs are in friction fit to form damping to realize stable paying-off.

5. The take-up structure of the pay-off box of the grass trimmer as claimed in claim 4, wherein: the terminal surface is protruding to be equipped with protruding axle under the drum, and protruding off-axial face is equipped with supplementary muscle.

6. The take-up structure of the pay-off box of the grass trimmer as claimed in claim 5, wherein: the paying-off box is matched with the paying-off cover, a convex ring corresponding to the convex shaft is arranged in the paying-off cover, and the auxiliary rib is in contact fit with the upper end face of the convex ring.