CN114771914B

CN114771914B - Tensioning device

Info

Publication number: CN114771914B
Application number: CN202210222538.1A
Authority: CN
Inventors: 孙华森; 刘至国; 董岩法
Original assignee: Zhejiang Topsun Logistic Control Co Ltd
Current assignee: Zhejiang Topsun Logistic Control Co Ltd
Priority date: 2022-03-07
Filing date: 2022-03-07
Publication date: 2024-01-02
Anticipated expiration: 2042-03-07
Also published as: CN114771914A

Abstract

The invention provides a tensioner, and belongs to the technical field of machinery. It has solved the inconvenient problem of current strainer operation. The tensioner comprises a support, a belt shaft and a ratchet wheel rotationally connected to the support, wherein the belt shaft comprises a movable half shaft and a fixed half shaft, the fixed half shaft is fixed with the ratchet wheel, the movable half shaft is connected with the ratchet wheel in a sliding manner along the axial direction, an operating part is fixed at the outer end of the movable half shaft, a clamping part is arranged on the fixed half shaft, the operating part and the clamping part are elastically clamped to axially position the movable half shaft and the fixed half shaft, and the operating part is pulled outwards along the axial direction of the movable half shaft to overcome the elastic clamping force so that the operating part and the clamping part are separated from each other to release the clamping. The tensioner integrates the positioning release of the movable half shaft and the pulling action of the movable half shaft, the handle is always clamped between ratchet teeth of the ratchet wheel in the whole threading operation process, no extra operation is needed, one hand can be left for holding and positioning the whole tensioner, the pulling is convenient, the whole operation process can be completed by a single person, and the tensioner is simple and convenient.

Description

Tensioning device

Technical Field

The invention belongs to the technical field of machinery, and relates to a tensioner.

Background

The tensioner is mainly applied to the transportation, the movement, the shipment or the storage of goods and serves as a device for binding and fixing the goods. The existing tensioner comprises a support, a belt shaft, a handle and two ratchet wheels rotationally connected to the support, wherein the belt shaft is formed by combining two half shafts, when the tensioner is used, a binding belt is threaded between the two half shafts, the handle drives the two ratchet wheels to rotate relative to the support, and accordingly the belt shaft is driven to rotate to wind and tighten the binding belt, and binding of goods is achieved. However, when the outside air temperature is low and icing occurs, or when the binding band is fluffed, or when the middle part of the binding band is knotted, the binding band is difficult to pass through between the two half shafts, so that the whole tensioner cannot be used.

Aiming at the problems, chinese patent application (application number 201120327966.8) discloses a binding device which comprises a bracket, a handle, a belt shaft and a binding belt, wherein the handle is hinged on the bracket through the belt shaft, a ratchet wheel is arranged on the belt shaft, the handle is connected with the handle in a sliding manner, the end part of the handle can be embedded into a ratchet of the ratchet wheel, the belt shaft consists of a first half shaft and a second half shaft, the first half shaft and the second half shaft are both connected on the ratchet wheel of the binding device, a gap for the binding belt to be connected is reserved between the first half shaft and the second half shaft, the second half shaft is fixedly connected with the ratchet wheel in the axial direction, the second half shaft can axially move relative to the ratchet wheel, a blocking piece is arranged on the handle, the two end parts of the half shaft are blocked by the blocking piece when the handle is embedded into the ratchet wheel, and the blocking piece is separated from the two end parts of the half shaft when the handle is separated from the ratchet wheel.

The binding belt can drive the blocking piece to be separated from the end part of the second half shaft by pulling the handle, so that the second half shaft can axially move relative to the first half shaft, and the binding belt can be moved away from or replaced from between the first half shaft and the second half shaft, so that the problem is solved, and the following defects still exist: when the binding device is used for carrying out the operation, one person is required to hold the binding device for positioning, then one hand of the other person pulls the handle to enable the blocking piece to be separated from the end part of the second half shaft and keep pulling the handle all the time, then the other hand pulls the second half shaft, and the whole process needs multiple persons to cooperate to finish the operation, so that the operation is inconvenient. When the binding device needs to be rolled and tensioned, the handle is pulled up to separate from the ratchet wheel and the support, then the handle is pulled upwards to enable the handle and the support to be staggered, the handle is then re-embedded onto the ratchet wheel of the ratchet wheel, the handle drives the ratchet wheel to rotate so that the first half shaft and the second half shaft rotate together to tighten the binding belt, and when the handle is pulled up to separate from the ratchet wheel and the support, an operator carelessly bumps the second half shaft to easily cause the second half shaft and the ratchet wheel to send and fall off, so that the threading operation is performed again, and the binding belt is troublesome.

In order to facilitate single operation, the prior common practice is to arrange a positioning structure on the bracket, which can position the handle after the handle drives the blocking piece to separate from the end part of the half shaft, but the whole structure becomes complex, and the manufacturing cost is increased.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a tensioner, which aims to solve the technical problems that: how to solve the problem of inconvenient operation of the existing tensioner.

The aim of the invention can be achieved by the following technical scheme: the utility model provides a strainer, includes support, take axle and rotates the ratchet of connecting on the support, take the axle to include moving the semi-axis and deciding the semi-axis, decide the semi-axis and be fixed mutually with the ratchet, move the semi-axis along axial and ratchet slip grafting, its characterized in that, the outer end of moving the semi-axis is fixed with and controls the piece, be equipped with the joint piece on deciding the semi-axis, control piece and joint piece elasticity joint and make to move the semi-axis and decide the semi-axis axial positioning, and follow the axial outwards pulling of moving the semi-axis and operate the control piece and can overcome above-mentioned elasticity joint force and make to control piece and joint piece break away from each other and release the joint.

When the outdoor temperature is very low, or the binding band is fluffed, or the middle part of the binding band is knotted, the tensioner can be held by one hand, the other hand holds the operation control piece to be pulled outwards, the outwards pulling force can overcome the elastic clamping force between the operation control piece and the clamping piece to enable the operation control piece and the clamping piece to be separated from each other, the movable half shaft to slide outwards, then the binding band is attached to the side face of the fixed half shaft, the operation control piece is pushed inwards, the movable half shaft slides inwards, the operation control piece and the clamping piece are clamped again to enable the movable half shaft to be axially positioned with the fixed half shaft, at the moment, the binding band is positioned between the fixed half shaft and the movable half shaft, the fact that the binding band passes through between the fixed half shaft and the movable half shaft is achieved, and normal use of the tensioner is ensured. That is, in the whole operation process, the handle is always clamped between the ratchets of the ratchet wheel, additional operation is not needed, and meanwhile, the release positioning of the movable half shaft and the pulling action of the movable half shaft are integrated together, so that one hand can be left for holding and positioning the whole tensioner, the pulling is convenient, and the whole operation process can be completed by a single person. Moreover, the structure for axially positioning the movable half shaft is completed through the matching structure between the movable half shaft and the fixed half shaft, and is not connected with the handle, so that when the tensioner needs to wind and tighten the binding belt, the handle is pulled up to separate from the ratchet wheel and the support, the movable half shaft is always in an axial positioning state through the mutual clamping action of the operating piece and the clamping piece, and even if an operator carelessly touches the movable half shaft, the movable half shaft cannot fall off the ratchet wheel as long as the acting force does not exceed the elastic clamping force between the operating piece and the fixed half shaft.

Meanwhile, in order to avoid the situation that the binding belt cannot be normally rolled and tensioned due to relative movement between the movable half shaft and the fixed half shaft in the tensioning process of the tensioner, in the conventional cognition in the field, the positioning of the movable half shaft is realized through a positioning structure in direct rigid butt joint, namely, the movable half shaft is directly blocked in the axial direction after being positioned and cannot move relative to the fixed half shaft. The tensioner realizes axial positioning through the fixed connection of the operating piece on the movable half shaft and then through the elastic clamping between the operating piece and the clamping piece on the fixed half shaft, namely the movable half shaft and the fixed half shaft realize relative positioning rather than absolute positioning through elastic clamping force, and when the axial force applied to the movable half shaft is greater than the elastic clamping force or can move along the axial direction, the axial acting force generated by the tensioner on the movable half shaft is relatively small in the process of winding and tensioning, and the elastic clamping force is enough to realize the positioning of the movable half shaft. That is, this application is through the elasticity joint of anti-conventional design, not only can satisfy the tensioner normal use time to moving the semi-axis with decide the positioning requirement of semi-axis, when wearing to establish the bandage between moving semi-axis and the semi-axis surely, the structural design of elasticity joint makes between the control piece and the semi-axis surely not have any relative displacement in the circumference, only realizes the location and releases the location in axial relative movement, need not to aim at other unnecessary operations such as, only need directly carry out the operation of push-and-pull can, the operation is more simple and convenient. In the present application, the fixed half shaft and the ratchet wheel are fixed relatively, but not absolutely, that is, the fixed half shaft and the ratchet wheel are positioned circumferentially, positioned axially or limited, and slightly movable axially is also within the scope of the present application.

In the tensioner, the clamping springs are fixed on the operating piece, two ends of the clamping springs are inwards bent to form strip-shaped clamping portions, the clamping pieces are columnar, one ends of the clamping pieces are fixedly connected to the end portions of the fixed half shafts, the other ends of the clamping pieces are provided with annular convex edges protruding in the radial direction, one ends of the annular convex edges are provided with chamfer portions in the shape of a circular table, annular clamping grooves are formed between the other ends of the annular convex edges and the end faces of the fixed half shafts, the two clamping portions are clamped into the clamping grooves, and one side groove wall of each clamping groove close to each chamfer portion forms a conical guide surface. The two clamping parts of the clamp spring are clamped into the annular clamping grooves to realize the axial positioning of the movable half shaft and the fixed half shaft, when the outside air temperature is very low, the phenomenon of icing occurs, or the phenomenon of fuzzing occurs on the binding belt, or the phenomenon of knotting occurs on the middle part of the binding belt, the bracket can be held by one hand, the other hand holds the operating part to pull the operating part forcefully outwards, under the action of the conical guide surface, the two clamping parts are gradually spread towards the two sides and separated from the clamping grooves, the clamp spring is elastically deformed, so that the positioning of the movable half shaft and the fixed half shaft is relieved, and the movable half shaft can be outwards pulled out to be separated from one ratchet wheel. Then paste the bandage and lean on the side of deciding the semi-axis, inwards promote again and operate the piece, thereby under the effect of chamfer portion, two joint portions can be strutted again and go into the draw-in groove again, move the semi-axis and reinsert in the above-mentioned ratchet and move the semi-axis and fix a position between the semi-axis, whole operation process single can accomplish, comparatively portably. The clamping piece is fixedly connected with the fixed half shaft, namely the clamping piece can be fixed on the fixed half shaft through a fastener, can also be arranged on the fixed half shaft in an environment, or can be directly integrated with the fixed half shaft.

In the tensioner, the taper of the chamfer portion is smaller than the taper of the guide surface. The taper of the chamfer part is smaller than that of the guide surface, so that the inward inclination amplitude of the guide surface relative to the chamfer part is larger, the clamp spring can be deformed to be separated from the clamping groove only by spending larger force when the operation part is pulled outwards, and the clamp spring can be deformed to be clamped into the clamping groove again by spending smaller force when the operation part is pushed inwards, so that the operation is simpler and more convenient, and the phenomenon that the movable half shaft falls off due to false touch when the tensioner is normally used is ensured.

As an alternative scheme, in the tensioner, the clamping spring is fixed on the operating piece, two ends of the clamping spring are inwards bent to form a strip-shaped clamping part, the clamping piece is columnar and fixedly connected to the end part of the fixed half shaft, the free end of the clamping piece is provided with a chamfer in a round table shape, clamping grooves which are symmetrically arranged are formed in the peripheral wall of the clamping piece, the two clamping parts are respectively clamped into the corresponding clamping grooves, and one side groove wall of the clamping groove, which is close to the chamfer part, forms an inclined guide surface. The two clamping parts of the clamp spring are respectively clamped into the corresponding clamping grooves to realize the axial positioning of the movable half shaft and the fixed half shaft, when the outside air temperature is very low, or when the binding belt is fluffed, or the middle part of the binding belt is knotted, the bracket can be held by one hand, the other hand holds the operating part to pull the operating part forcefully outwards, under the action of the conical guide surface, the two clamping parts are gradually opened to two sides and separated from the corresponding clamping grooves, the clamp spring is elastically deformed, so that the positioning of the movable half shaft and the fixed half shaft is released, and the movable half shaft can be outwards pulled out to one of the ratchet wheels for separation. Then paste the bandage and lean on the side of deciding the semi-axis, inwards promote again and operate the piece, thereby under the effect of chamfer portion, two joint portions can be propped up open again and go into corresponding draw-in groove again, move the semi-axis reinsertion in the above-mentioned ratchet and move the semi-axis and decide the semi-axis between location, whole operation process single can accomplish, comparatively portably.

In the tensioner, the operating member is columnar, a first fixed groove and a second fixed groove are respectively formed in the operating member, the outer end of the movable half shaft is arranged in the first fixed groove in a penetrating manner and fixedly connected with the operating member, a yielding hole for the clamping member to stretch in is formed in the bottom wall of the second fixed groove, and the clamping spring is fixed in the second fixed groove and two clamping portions are located at the orifice of the yielding hole. The outer end of the fixed half shaft can be extended into the fixed groove II, and the design of the abdication hole provides an axial extension space for the clamping piece II, the two clamping parts are positioned at the orifice of the abdication hole, and the clamping piece II can be limited in the abdication hole after the two clamping parts are clamped into the clamping groove, so that the fixed half shaft and the movable half shaft are positioned in the axial direction.

In the tensioner, the bottom wall of the second fixing groove is further provided with a mounting groove, the orifice of the abdication hole is located in the mounting groove, the clamp spring is embedded in the mounting groove, the bottom wall of the second fixing groove is further fixedly provided with a cover plate capable of covering the mounting groove, and the cover plate is provided with a through hole opposite to the abdication hole. The clamping spring is positioned in the mounting groove through the design of the cover plate, so that the clamping spring cannot shake in the axial direction of the fixed half shaft, the positioning stability after clamping is ensured, and meanwhile, the clamping spring is convenient to install and replace.

In the tensioner, the support is provided with two mounting plates which are arranged in two opposite directions, the two ratchet wheels are respectively connected to the two mounting plates in a rotating mode, the two ratchet wheels are provided with first inserting holes for sliding insertion of the movable half shafts, the inner ends of the movable half shafts are provided with limiting pins which are arranged in a radial protruding mode and can abut against the two ratchet wheels, the ratchet wheel far away from the control is provided with a yielding groove communicated with the first inserting holes, and when the control and the clamping piece are clamped with each other, the limiting pins are embedded into the yielding groove. The setting of spacer pin can do a spacing to the removal stroke of moving the semi-axis, avoids moving the semi-axis by the pull and breaks away from the support completely. Meanwhile, the design of the abdication groove on the ratchet wheel far away from the operation control is matched, so that the limit pin can be just embedded into the abdication groove when the movable half shaft and the fixed half shaft are axially positioned, the binding belt can not be propped against, and the influence on the winding of the binding belt is avoided.

In the tensioner, two opposite sides of the ratchet wheels are respectively provided with a convex cylindrical connecting part, the mounting plate is provided with a connecting hole, the connecting parts are rotationally connected in the corresponding connecting holes, the connecting parts of the two ratchet wheels are respectively provided with the first plugging holes, and the yielding groove is formed in the connecting part of the ratchet wheel far away from the operating piece. The ratchet is rotationally connected to the support through the connecting part, and the abdication groove is formed in the connecting part, so that the position of the abdication groove is located in a connecting hole of the support, the concealment is good after the limit pin is embedded into the abdication groove, and the strength of the ratchet cannot be influenced by the provision of the abdication groove.

In the tensioner, the two ends of the fixed half shaft are respectively provided with the positioning pin, and when the operation control piece and the clamping piece are mutually clamped, the operation control piece is abutted against the positioning pins on the corresponding end parts of the fixed half shaft. And the connecting parts of the two ratchet wheels are also provided with second inserting holes, two ends of the fixed half shaft are respectively penetrated through the inserting holes Kong Erna, and the two locating pins are respectively positioned on one back side of the two ratchet wheels, so that the fixed half shaft is axially positioned on the bracket. When the operation control piece and the clamping piece form clamping connection, the operation control piece is propped against the locating pin on the corresponding end part of the fixed half shaft, so that the movable half shaft can be prevented from being pushed inwards to be over-head.

As an alternative scheme, in the tensioner, the operating member is provided with two clamping legs which are oppositely arranged, the two clamping legs are respectively provided with a clamping joint with a trapezoidal section, the clamping member is a clamping hole formed in the fixed half shaft, two symmetrically arranged clamping grooves are formed in the inner wall of the clamping hole, and the two clamping legs can extend into the clamping holes and the two clamping joints are respectively clamped into the corresponding clamping grooves. Elastic clamping between the operation piece and the fixed half shaft can be realized through the matching mode of the two clamping pins and the clamping holes.

In the tensioner, the outer peripheral wall of the control member has a plurality of friction strips. The design of a plurality of friction strips is convenient for the application.

Compared with the prior art, the tensioner has the following advantages:

1. in the whole operation process, the handle is always kept clamped between ratchets of the ratchet wheel without additional operation, and simultaneously the release positioning of the movable half shaft and the pulling action of the movable half shaft are integrated together, so that one hand can be left for holding and positioning the whole tensioner, the pulling is convenient, and the whole operation process can be completed by a single person.

2. When the tensioner needs to pull the binding belt up and pull the binding belt away from the ratchet wheel and the support, the movable half shaft is always in an axial positioning state through the mutual clamping action of the operating piece and the clamping piece, and even if an operator carelessly touches the movable half shaft, the movable half shaft cannot fall off the ratchet wheel as long as the acting force does not exceed the elastic clamping force between the operating piece and the clamping piece.

3. The limiting pin can limit the moving stroke of the movable half shaft, the movable half shaft is prevented from being completely separated from the support by drawing, and meanwhile, the limiting pin is enabled to be just embedded into the yielding groove when the movable half shaft and the fixed half shaft are axially positioned, the binding belt cannot be propped against, and the influence on the winding of the binding belt is avoided.

Drawings

Fig. 1 is a perspective view of the tensioner.

Fig. 2 is a perspective view of a second construction of the tensioner.

FIG. 3 is a partial cross-sectional view of the control and the fixed half shaft.

Fig. 4 is a perspective view of a fixed half shaft.

Fig. 5 is a schematic perspective view of an operating member and a dynamic half shaft.

Fig. 6 is a partial perspective view of the control.

Fig. 7 is a perspective view of the snap spring.

Fig. 8 is a perspective view of the bracket.

Fig. 9 is a perspective view of one of the ratchet gears.

Fig. 10 is a schematic view of the installation structure of the snap spring in the operation control.

Fig. 11 is an exploded view of the control, circlip, and cover plate.

In the figure, 1, a bracket; 1a, a mounting plate; 1a1, a connecting hole; 2. a belt shaft; 2a, a dynamic half shaft; 2a1, a limiting pin; 2b, fixing a half shaft; 2b1, locating pins; 3. a ratchet wheel; 3a, a first plug hole; 3b, a yielding groove; 3c, a connecting part; 3d, inserting holes II; 4. a handle; 5. a handle; 6. an operation control; 6a, a first fixing groove; 6b, a second fixing groove; 6c, giving way holes; 6d, a mounting groove; 6e, cover plate; 6e1, through holes; 6f, friction strips; 7. a clamping piece; 7a, annular convex edges; 7b, chamfering part; 7c, a guide surface; 7d, clamping grooves; 8. clamping springs; 8a, a clamping part.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Example 1

As shown in fig. 1-11, the tensioner comprises a bracket 1, a belt shaft 2, a ratchet wheel 3, a handle 4 and a handle 5. The bracket 1 is provided with two opposite mounting plates 1a, the mounting plates 1a are provided with connecting holes 1a1, the ratchet wheels 3 are provided with two, the two ratchet wheels 3 are respectively positioned on one side of the two mounting plates 1a opposite to each other, the opposite sides of the two ratchet wheels 3 are respectively provided with a connecting part 3c protruding to be cylindrical, and the connecting parts 3c are rotationally connected in the corresponding connecting holes 1a 1. The handle 4 is provided with two oppositely arranged connecting plates, the connecting plates are provided with mounting holes, one sides of the two ratchet wheels 3 opposite to each other are provided with protruding cylindrical rotating parts, and the rotating parts are rotationally connected in the corresponding mounting holes. The two connecting plates of the handle 4 are also respectively provided with a strip-shaped chute, the handle is provided with a plate-shaped limiting part, two sides of the limiting part are slidably connected in the two chutes, the bracket 1 is provided with a limiting groove, and the limiting part of the handle can be simultaneously clamped into the limiting groove and the tooth groove of the ratchet wheel 3 or the limiting part of the handle. Can be simply snapped into the tooth socket of the ratchet 3.

Specifically, the belt shaft 2 includes a movable half shaft 2a and a fixed half shaft 2b, the radial sections of the movable half shaft 2a and the fixed half shaft 2b are semicircular, the connecting portion 3c of the two ratchet wheels 3 is provided with a first plugging hole 3a and a second plugging hole 3d, and the first plugging hole 3a and the second plugging hole 3d are semicircular holes. The two ends of the fixed half shaft 2b are respectively provided with a positioning pin 2b1, the two ends of the fixed half shaft 2b are respectively penetrated in the two inserting holes 3d, and the two positioning pins 2b1 are respectively positioned at one back side of the two ratchet wheels 3, so that the fixed half shaft 2b is axially positioned on the bracket 1. The dynamic half shaft 2a sequentially passes through the first inserting holes 3a of the two ratchet wheels 3 and can axially slide relative to the two ratchet wheels 3.

The outer end of the movable half shaft 2a is fixedly provided with a control piece 6, a clamp spring 8 is fixed on the control piece 6, two ends of the clamp spring 8 are inwards bent to form a strip-shaped clamping part 8a, a clamping piece 7 is arranged on the fixed half shaft 2b, the clamping piece 7 is columnar, one end of the clamping piece 7 is fixedly connected to the end part of the fixed half shaft 2b, the other end of the clamping piece 7 is provided with an annular convex edge 7a protruding radially, one end of the annular convex edge 7a is provided with a round table-shaped chamfer part 7b, an annular clamping groove 7d is formed between the other end of the annular convex edge 7a and the end face of the fixed half shaft 2b, the two clamping parts 8a are clamped into the clamping groove 7d, one side groove wall of the clamping groove 7d, which is close to the chamfer part 7b, forms a conical guide surface 7c, and the taper of the chamfer part 7b is smaller than that of the guide surface 7c.

Further, the control member 6 is in a column shape, a first fixing groove 6a and a second fixing groove 6b are respectively formed in the control member 6, and the outer end of the movable half shaft 2a is inserted into the first fixing groove 6a and fixedly connected with the control member 6. The bottom wall of the second fixed groove 6b is provided with a yielding hole 6c for the clamping piece 7 to extend into, the bottom wall of the second fixed groove 6b is also provided with a mounting groove 6d, the orifice part of the yielding hole 6c is positioned in the mounting groove 6d, the clamping spring 8 is embedded in the mounting groove 6d, and the two clamping parts 8a are both positioned at the orifice part of the yielding hole 6 c. The bottom wall of the second fixing groove 6b is also fixed with a cover plate 6e capable of covering the mounting groove 6d, and the cover plate 6e is provided with a through hole 6e1 opposite to the abdicating hole 6 c.

The inner end of the movable half shaft 2a is provided with a limiting pin 2a1 which is arranged along the radial protrusion of the movable half shaft 2a and can abut against two ratchets 3, a yielding groove 3b which is communicated with a first plugging hole 3a is formed in a connecting part 3c of the ratchet 3 far away from the control part 6, when the control part 6 and the second clamping part 7 are mutually clamped so that the movable half shaft 2a and the fixed half shaft 2b are axially positioned, the limiting pin 2a1 is embedded into the yielding groove 3b, a binding belt cannot be propped against, the influence on the winding of the binding belt is avoided, and at the moment, the control part 6 abuts against the positioning pin 2b1 on the corresponding end part of the fixed half shaft 2 b. The peripheral wall of the control member 6 is provided with a plurality of friction strips 6f for facilitating the application of force.

When the outdoor temperature is very low and icing occurs, or the binding band is fluffed, or the middle part of the binding band is knotted, the tensioner can hold the bracket 1 by one hand, the operating piece 6 is pulled outwards by the other hand, under the action of the conical guide surface 7c, the two clamping parts 8a are gradually opened to two sides and separated from the clamping grooves 7d, the clamping springs 8 are elastically deformed, so that the positioning of the movable half shaft 2a and the fixed half shaft 2b is relieved, and the movable half shaft 2a can be outwards pulled out to separate one ratchet wheel 3. Then the bandage is attached to the side face of the fixed half shaft 2b, the operation piece 6 is pushed inwards, under the action of the chamfering part 7b, the two clamping parts 8a can be propped up again to be clamped into the clamping groove 7d again, the movable half shaft 2a is reinserted into the ratchet wheel 3 and positioned between the movable half shaft 2a and the fixed half shaft 2b, at the moment, the bandage is positioned between the fixed half shaft 2b and the movable half shaft 2a, the fact that the bandage passes through the fixed half shaft 2b and the movable half shaft 2a is achieved, and the whole operation process can be completed by a single person is relatively simple and convenient. Moreover, the structure for axially positioning the movable half shaft 2a is completed through the matching structure between the movable half shaft 2a and the fixed half shaft 2b, and is not connected with the handle 5, so when the handle 5 is pulled up to separate from the ratchet wheel 3 and the bracket 1 in the process that the tensioner needs to wind and tighten the binding belt, the movable half shaft 2a is always in an axially positioning state through the mutual clamping action of the operating piece 6 and the clamping piece 7, and even if an operator carelessly touches the movable half shaft 2a, the movable half shaft 2a cannot fall off from the ratchet wheel 3 as long as the acting force does not exceed the elastic clamping force between the two.

Example two

The tensioner of this embodiment is substantially identical to the first embodiment, except that:

the clamping springs 8 are fixed on the control piece 6, two ends of the clamping springs 8 are inwards bent to form strip-shaped clamping portions 8a, the clamping pieces 7 are columnar and fixedly connected to the end portions of the fixed half shafts 2b, the free ends of the clamping pieces 7 are provided with round table-shaped chamfers, two symmetrically-arranged clamping grooves 7d are formed in the peripheral wall of the clamping pieces 7, the two clamping portions 8a are respectively clamped into the corresponding clamping grooves 7d, and inclined guide surfaces 7c are formed on the groove walls of one side, close to the chamfer portions 7b, of the clamping grooves 7 d.

Example III

The tensioner of the present embodiment is different from the first embodiment in that: the operation piece 6 is provided with two opposite clamping feet, the two clamping feet are provided with clamping joints with trapezoidal sections, the clamping piece 7 is a clamping hole formed in the fixed half shaft 2b, two symmetrically arranged clamping grooves are formed in the inner wall of the clamping hole, the two clamping feet can extend into the clamping hole, and the two clamping joints are respectively clamped into the corresponding clamping grooves. Elastic clamping between the control piece 6 and the fixed half shaft 2b can be realized through the matching mode of the two clamping legs and the clamping holes.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although terms such as the bracket 1, the mounting plate 1a, the connection hole 1a1, the belt shaft 2, the dynamic half shaft 2a, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.

Claims

1. The tensioner comprises a bracket (1), a belt shaft (2) and a ratchet wheel (3) rotationally connected to the bracket (1), wherein the belt shaft (2) comprises a movable half shaft (2 a) and a fixed half shaft (2 b), the fixed half shaft (2 b) is fixed with the ratchet wheel (3), the movable half shaft (2 a) is in sliding connection with the ratchet wheel (3) along the axial direction, the tensioner is characterized in that a control piece (6) is fixed at the outer end of the movable half shaft (2 a), a clamping piece (7) is arranged on the fixed half shaft (2 b), a clamp spring (8) is fixed on the control piece (6), two ends of the clamp spring (8) are inwards bent to form a strip-shaped clamping part (8 a), the clamping piece (7) is columnar, one end of the clamping piece (7) is fixedly connected with the end of the fixed half shaft (2 b), a clamping groove (7 d) is formed in the clamping piece (7), a clamping hole (6) which can be used for allowing the clamping piece (7) to extend into is formed in the outer end of the control piece (2 a), the clamping piece (6) is provided with a clamping hole (6 c) which can be positioned at the position of the clamping piece (6 a) and the two clamping piece (6 a) and the elastic hole (2 a) are positioned at the position of the clamping piece (6 a) and the axial position of the clamping piece (2 b), and the operating piece (6) is pulled outwards along the axial direction of the movable half shaft (2 a) to overcome the elastic clamping force, so that the operating piece (6) and the clamping piece (7) are separated from each other to release the clamping.

2. Tensioner according to claim 1, characterized in that the other end of the clamping piece (7) is provided with an annular protruding edge (7 a) protruding along the radial direction, one end of the annular protruding edge (7 a) is provided with a round table-shaped chamfer part (7 b), an annular clamping groove (7 d) is formed between the other end and the end face of the fixed half shaft (2 b), the two clamping parts (8 a) are clamped into the clamping groove (7 d), and a conical guide surface (7 c) is formed on the groove wall of one side of the clamping groove (7 d) close to the chamfer part (7 b).

3. Tensioner according to claim 2, characterized in that the taper of the chamfer (7 b) is smaller than the taper of the guide surface (7 c).

4. Tensioner according to claim 1, characterized in that the free end of the clamping piece (7) is provided with a chamfer in the shape of a truncated cone, the peripheral wall of the clamping piece (7) is provided with two symmetrically arranged clamping grooves (7 d), two clamping parts (8 a) are respectively clamped into the corresponding clamping grooves (7 d), and the groove wall of one side of the clamping groove (7 d) close to the chamfer part (7 b) forms an inclined guide surface (7 c).

5. The tensioner according to claim 2, 3 or 4, wherein the operating member (6) is in a column shape, a first fixing groove (6 a) and a second fixing groove (6 b) are respectively formed in the operating member (6), the outer end of the movable half shaft (2 a) is inserted into the first fixing groove (6 a) and fixedly connected with the operating member (6), the bottom wall of the second fixing groove (6 b) is provided with the above-mentioned abdicating hole (6 c), and the snap spring (8) is fixed in the second fixing groove (6 b).

6. The tensioner of claim 5, wherein the bottom wall of the second fixing groove (6 b) is further provided with a mounting groove (6 d), the orifice portion of the yielding hole (6 c) is located in the mounting groove (6 d), the snap spring (8) is embedded in the mounting groove (6 d), the bottom wall of the second fixing groove (6 b) is further fixed with a cover plate (6 e) capable of covering the mounting groove (6 d), and the cover plate (6 e) is provided with a through hole (6 e 1) opposite to the yielding hole (6 c).

7. The tensioner of claim 1, 2, 3 or 4, wherein the bracket (1) is provided with two mounting plates (1 a) which are arranged oppositely, the two ratchets (3) are respectively connected to the two mounting plates (1 a) in a rotating way, the two ratchets (3) are respectively provided with a first plugging hole (3 a) which can be used for sliding and plugging a half shaft (2 a), the inner end of the half shaft (2 a) is provided with a limiting pin (2 a 1) which is arranged in a radial protruding way and can be abutted against the two ratchets (3), a yielding groove (3 b) which is communicated with the first plugging hole (3 a) is formed in the ratchet (3) which is far away from the control part (6), and when the control part (6) and the clamping part (7) are clamped with each other, the limiting pin (2 a 1) is embedded into the yielding groove (3 b).

8. The tensioner according to claim 7, characterized in that the opposite sides of the two ratchets (3) are respectively provided with a connecting portion (3 c) protruding into a cylinder shape, the mounting plate (1 a) is provided with a connecting hole (1 a 1), the connecting portions (3 c) are rotatably connected in the corresponding connecting holes (1 a 1), the connecting portions (3 c) of the two ratchets (3) are respectively provided with the first plugging hole (3 a), and the yielding groove (3 b) is provided on the connecting portion (3 c) of the ratchet (3) far away from the operating piece (6).

9. Tensioner according to claim 1 or 2 or 3 or 4, characterized in that the two ends of the half-fixing shaft (2 b) are provided with positioning pins (2 b 1), and when the operating member (6) and the clamping member (7) are mutually clamped, the operating member (6) abuts against the positioning pins (2 b 1) on the corresponding ends of the half-fixing shaft (2 b).