CN114771914A

CN114771914A - Tensioner

Info

Publication number: CN114771914A
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: 2022-07-22
Anticipated expiration: 2042-03-07
Also published as: CN114771914B

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 rotatably 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 in sliding insertion with the ratchet wheel along the axial direction, a control part is fixed at the outer end of the movable half shaft, a clamping part is arranged on the fixed half shaft, the control part and the clamping part are elastically clamped to enable the movable half shaft and the fixed half shaft to be axially positioned, and the control part is pulled outwards along the axial direction of the movable half shaft to overcome the elastic clamping force so that the control part and the clamping part are mutually separated to release clamping. This strainer with the half axle that moves relieve the location with move the half axle pull action integrated to be in the same place, in whole area operation process of wearing, the handle keeps the card in the ratchet intertooth space of ratchet always, need not to carry out extra operation, can vacate a hand and be used for gripping the location with whole strainer, the pull of being convenient for, whole operation process is single can accomplish, and is comparatively simple and convenient.

Description

Tensioner

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, movement, shipment or storage of goods, and plays a role in binding and fixing the goods. The existing tensioner comprises a support, a belt shaft, a handle and two ratchet wheels which are rotatably connected to the support, wherein the belt shaft is formed by combining two half shafts, when the tensioner is used, a binding band penetrates between the two half shafts, the handle drives the two ratchet wheels to rotate relative to the support, and therefore the belt shaft is driven to rotate to wind and tighten the binding band to bind cargoes. However, when the freezing phenomenon occurs due to low outside air temperature, or the binding band is fluffy, or the middle part of the binding band is knotted, the binding band is difficult to pass through the two half shafts, so that the whole tensioner cannot be used.

In order to solve the problems, the Chinese patent application (application number: 201120327966.8) discloses a binding device, which comprises a support, a handle, a belt shaft and a binding band, wherein the handle is hinged on the support through the belt shaft, a ratchet wheel is arranged on the belt shaft, the handle is connected on the handle in a sliding way, the end part of the handle can be embedded into a ratchet tooth of the ratchet wheel, the belt shaft consists of a half shaft I and a half shaft II, the half shaft I and the half shaft II are both connected on the ratchet wheel of the binding device, a gap for connecting the binding band is arranged between the half shaft I and the ratchet wheel, the half shaft I is fixedly connected with the ratchet wheel, the half shaft II is fixedly connected with the ratchet wheel in an axial direction, the half shaft II can move relative to the ratchet wheel in an axial direction, a blocking piece is arranged on the handle, the blocking piece blocks the two end parts of the half shaft 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 band 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 move axially relative to the first half shaft, and the binding band can be removed or replaced from between the first half shaft and the second half shaft, thereby solving the problems, but having the following defects: 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, the whole process needs cooperation of multiple persons to complete the operation, and the operation is inconvenient. Moreover, when the binding device needs to be furled and tensioned, the handle needs to be pulled upwards to separate the handle from the ratchet wheel and the support, then the handle is pulled upwards to enable the handle and the support to be staggered, then the handle is embedded into the ratchet of the ratchet wheel again, the handle drives the ratchet wheel to rotate to enable the half shaft I and the half shaft II to rotate together to furl and tension the binding band, and when the handle is pulled upwards to separate the handle from the ratchet wheel and the support, if an operator accidentally touches the half shaft II, the half shaft II and the ratchet wheel are easy to send and fall off, and therefore the operation of threading the binding band again is troublesome.

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

Disclosure of Invention

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

The purpose of the invention can be realized by the following technical scheme: a tensioner comprises a support, a belt shaft and a ratchet wheel rotatably 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 in sliding insertion with the ratchet wheel along the axial direction, and the tensioner is characterized in that 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 in elastic clamping to enable the movable half shaft and the fixed half shaft to be axially positioned, 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 clamping.

When the tensioner freezes at low outside temperature, or the bandage fluffs, or the middle part of the bandage is knotted, the bracket can be held by one hand, the operating part is held by the other hand to be pulled outwards, the outward pulling force can overcome the elastic clamping force between the operating part and the clamping part, so that the operating part and the clamping part are separated from the clamping relation, the movable half shaft slides outwards, then the bandage is attached to the side surface of the fixed half shaft and pushes the operating part inwards, the movable half shaft slides inwards, the operating part and the clamping part are clamped again, so that the movable half shaft and the fixed half shaft are axially positioned, and at the moment, the bandage is positioned between the fixed half shaft and the movable half shaft, so that the bandage penetrates through the fixed half shaft and the movable half shaft, and the tensioner can be normally used. That is to say, in whole operation process, the handle keeps keeping card in the intertooth space of ratchet always, need not to carry out extra operation, and the while is in the same place the removal location of movable half-shaft and the action of movable half-shaft pull have integrated, consequently can vacate a hand and be used for gripping the location with whole strainer, the pull of being convenient for, consequently, whole operation process is single can accomplish, and is comparatively simple and convenient. Moreover, the structure for axially positioning the movable half shaft is completed through a matching structure between the movable half shaft and the fixed half shaft, and is not connected with the handle, so that when the handle is pulled upwards to separate the handle from the ratchet wheel and the bracket in the process that the tightener needs to wind and tighten the binding band, the movable half shaft is always in an axially positioned state through the mutual clamping action of the operating part and the clamping part, and even if an operator accidentally touches the movable half shaft, the actuating half shaft cannot fall off from the ratchet wheel as long as the acting force does not exceed the elastic clamping force between the operating part and the clamping part.

Meanwhile, in order to avoid that the binding band cannot be normally furled and tensioned due to the relative movement of the movable half shaft and the fixed half shaft of the tensioner in the tensioning process, in the conventional cognition of the field, the positioning of the movable half shaft is realized through a positioning structure in direct rigid abutment, namely the movable half shaft is directly clamped and cannot move relative to the fixed half shaft in the axial direction after being positioned. The tensioner realizes axial positioning by fixedly connecting the operating member on the movable half shaft and then elastically clamping the operating member and the clamping member 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, when the axial force applied to the movable half shaft is greater than the elastic clamping force, the movable half shaft can move axially, however, in the process of furling and tensioning the tensioner, the axial acting force generated on the movable half shaft is relatively small, and the elastic clamping force is enough to realize positioning of the movable half shaft. That is to say, this application not only can satisfy the location requirement to dynamic half axle and fixed half axle when the strainer normal use through the elasticity joint of anti-conventional design, and when wearing to establish the bandage between dynamic half axle and the fixed half axle, the structural design of elasticity joint makes to be controlled and does not have any relative displacement between the semi-axis in week, and only relative movement realizes fixing a position and removes the location in the axial, need not other unnecessary operations such as alignment, only need directly carry out the operation of push-and-pull can, it is more simple and convenient to operate. In the application, the fixed half shaft and the ratchet wheel are fixed relatively rather than absolutely, that is, the fixed half shaft and the ratchet wheel are circumferentially positioned, axially positioned or limited, and slightly axially movable, so that the fixed half shaft and the ratchet wheel are also in the scope of the application.

In the tensioner, a clamp spring is fixed on the control part, two ends of the clamp spring are bent inwards to form a strip-shaped clamping part, the clamping part is columnar, one end of the clamping part is fixedly connected to the end part of the fixed half shaft, the other end of the clamping part is provided with an annular convex edge protruding in the radial direction, one end of the annular convex edge is provided with a truncated cone-shaped chamfer part, an annular clamping groove is formed between the other end of the clamping part and the end surface of the fixed half shaft, the two clamping parts are clamped into the clamping groove, and a groove wall on one side of the clamping groove, which is close to the chamfer part, forms a conical guide surface. The two clamping parts of the clamp spring are clamped into the annular clamping groove to achieve axial positioning of the movable half shaft and the fixed half shaft, when icing occurs at low outside air temperature, or fuzzing occurs in the bandage, or knotting occurs in the middle of the bandage, the support can be held by one hand, the control piece is held by the other hand to be pulled outwards with force, under the action of the conical guide surface, the two clamping parts are gradually propped open towards two sides and separated from the clamping groove, the clamp spring is elastically deformed, positioning of the movable half shaft and the fixed half shaft is released, and the movable half shaft can be pulled outwards to be separated from one ratchet wheel. Then paste the bandage and lean on the side of deciding the semi-axis, inwards promote the control piece again, under the effect of chamfer portion, thereby two joint portions can be strutted once more and block into the draw-in groove again, move the semi-axis and insert in above-mentioned ratchet again and move the location between semi-axis and the deciding the semi-axis, whole operation process is single can accomplish, and is comparatively simple and convenient. 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 be arranged on the fixed half shaft or can be directly integrated with the fixed half shaft.

In the tensioner described above, the taper of the chamfered portion is less than the taper of the guide surface. The tapering of chamfer is less than the tapering of spigot surface for the relative chamfer of spigot surface is inwards inclined the range great, thereby need the great power of cost just can make the jump ring take place to deform and break away from the draw-in groove when outwards pulling the controlling part, then can cost littleer power when inwards promoting the controlling part and make the jump ring take place to deform and block into the draw-in groove again, make the operation more simple and convenient and guarantee that the tensioner normally uses the time movable half axle not to taking place to drop because the mistake touches.

As an alternative scheme, in the tensioner, a clamp spring is fixed on the control element, two ends of the clamp spring are both bent inwards to form a strip-shaped clamping portion, the clamping member is columnar and is fixedly connected to the end portion of the fixed half shaft, a free end of the clamping member is provided with a truncated cone-shaped chamfer, two symmetrically arranged clamping grooves are formed in the peripheral wall of the clamping member, the two clamping portions are respectively clamped into the corresponding clamping grooves, and an inclined guide surface is formed on one side groove wall of each clamping groove close to the corresponding chamfer portion. Two clamping parts of the clamp spring are respectively clamped into corresponding clamping grooves to achieve axial positioning of the movable half shaft and the fixed half shaft, when icing occurs at low outside air temperature, or fuzzing occurs in the bandage, or knotting occurs in the middle of the bandage, the support can be held by one hand, the control piece is held by the other hand to be pulled outwards with force, under the action of the conical guide surface, the two clamping parts are gradually propped open towards two sides and separated from the corresponding clamping grooves, and the clamp spring is elastically deformed, so that positioning of the movable half shaft and the fixed half shaft is released, and the movable half shaft can be pulled outwards to be separated from one ratchet wheel. Then paste the bandage and lean on the side of deciding the semi-axis, inwards promote the control piece again, under the effect of chamfer portion, thereby two joint portions can be strutted once more and block into corresponding draw-in groove again, move the semi-axis and insert in above-mentioned ratchet again and move the location between semi-axis and the deciding the semi-axis, whole operation process is single can accomplish, and is comparatively simple and convenient.

In the tensioner, the control part is columnar, a first fixing groove and a second fixing groove are respectively formed in the control part, the outer end of the movable half shaft is arranged in the first fixing groove in a penetrating mode and fixedly connected with the control part, a yielding hole for the clamping part to stretch into is formed in the bottom wall of the second fixing groove, the clamp spring is fixed in the second fixing groove, and the two clamping parts are located at the hole opening of the yielding hole. The outer end that fixed slot two can supply the semi-axis to stretch into, and the design in the hole of stepping down then for joint spare two provides the ascending space of stretching into of axial, two joint portions are located the drill way department in the hole of stepping down, can be with two spacing downtheholes stepping down of joint spare behind the draw-in groove is gone into to two joint portion cards to make semi-axis and the location of dynamic half axle in the axial.

In the tensioner, a mounting groove is further formed in the bottom wall of the second fixing groove, the orifice part of the yielding hole is located in the mounting groove, the clamp spring is embedded in the mounting groove, a cover plate capable of covering the mounting groove is further fixed on the bottom wall of the second fixing groove, and a through hole opposite to the yielding hole is formed in the cover plate. The clamp spring is positioned in the mounting groove through the design of the cover plate, so that the clamp spring cannot shake in the axial direction along the fixed half shaft, the stability of positioning after clamping is guaranteed, and meanwhile, the clamp spring is convenient to mount and replace.

In the tensioner, the support is provided with two mounting plates which are arranged oppositely, the ratchet wheels are provided with two ratchet wheels, the two ratchet wheels are respectively connected to the two mounting plates in a rotating mode, the two ratchet wheels are respectively provided with a first insertion hole for the sliding insertion of the movable half shaft, the inner end of the movable half shaft is provided with a limiting pin which is arranged in a protruding mode along the radial direction and can abut against the two ratchet wheels, the ratchet wheel far away from the operating control piece is provided with a abdicating groove communicated with the first insertion hole, and when the operating control piece and the clamping piece are mutually clamped, the limiting pin is embedded into the abdicating groove. The arrangement of the limiting pin can limit the moving stroke of the movable half shaft, so that the movable half shaft is prevented from being pulled and separated from the support completely. Meanwhile, the design of the abdicating groove on the ratchet wheel far away from the control element is matched, so that when the movable half shaft and the fixed half shaft are axially positioned, the limiting pin can be just embedded into the abdicating groove, the binding band can not be propped against, and the influence on the winding of the binding band is avoided.

In the tensioner, the opposite sides of the two ratchet wheels are respectively provided with a connecting part which protrudes and is cylindrical, the mounting plate is provided with a connecting hole, the connecting parts are rotatably connected in the corresponding connecting holes, the connecting parts of the two ratchet wheels are respectively provided with the first inserting hole, and the abdicating groove is formed in the connecting part of the ratchet wheel far away from the operating part. The ratchet wheel is rotatably connected to the support through the connecting portion, the abdicating groove is formed in the connecting portion, so that the abdicating groove is located in the connecting hole of the support, the limiting pin is embedded into the abdicating groove and then is good in concealment, and the abdicating groove is formed without affecting the strength of the ratchet wheel.

In the tensioner, the two ends of the fixed half shaft are provided with the positioning pins, and when the operating part and the clamping part are clamped with each other, the operating part abuts against the positioning pins on the corresponding end parts of the fixed half shaft. Still all seted up spliced eye two on the connecting portion of two ratchets, the both ends of semi-axis are worn to establish respectively in spliced eye two, and two locating pins are located two ratchets dorsad one side respectively to make semi-axis axial positioning on the support. When the control piece and the clamping piece form clamping, the control piece is abutted against the positioning pin on the corresponding end part of the fixed half shaft, so that the movable half shaft is prevented from pushing the head inwards.

As an alternative, in the tensioner described above, the operating member has two oppositely disposed clamping legs, the two clamping legs have clamping heads with trapezoidal cross sections, the clamping member is a clamping hole formed in the fixed half shaft, two symmetrically disposed clamping grooves are formed in the inner wall of the clamping hole, the two clamping legs can extend into the clamping hole, and the two clamping heads are respectively clamped into the corresponding clamping grooves. The elastic clamping between the control piece and the fixed half shaft can be realized through the matching mode of the two clamping feet and the clamping hole.

In the tensioner, the peripheral wall of the control member is provided with a plurality of friction strips. The design of a plurality of friction strips is convenient for exerting force.

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

1. in the whole operation process, the handle is always kept clamped between the ratchet teeth of the ratchet wheel, extra operation is not needed, the movable half shaft is simultaneously integrated with the movable half shaft drawing action in the releasing and positioning mode, one hand can be left for holding and positioning the whole tensioner, drawing is convenient, and therefore the whole operation process can be completed by one person, and the operation is simple and convenient.

2. When the tensioner needs to take up and tighten the bandage, the handle is pulled upwards to separate the handle from the ratchet wheel and the bracket, the movable half shaft is always in an axial positioning state through the mutual clamping action of the operating part and the clamping part, and even if an operator accidentally touches the movable half shaft, the movable half shaft cannot be led to fall off from the ratchet wheel as long as the acting force does not exceed the elastic clamping force between the operating part and the clamping part.

3. The spacer pin can do a spacingly to the removal stroke of moving the semi-axis, avoids moving the semi-axis and is broken away from the support completely by the pull, the design in groove of stepping down simultaneously for when moving semi-axis and fixed semi-axis axial positioning, the spacer pin can just imbed the inslot of stepping down, can not withstand the bandage, avoids causing the influence to the roll-up of bandage.

Drawings

Fig. 1 is a first perspective view of the tensioner.

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

Fig. 3 is a partial sectional view of the control and the fixed half shaft.

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

Fig. 5 is a schematic perspective view of the control member and the movable half shaft.

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

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

Fig. 8 is a perspective view of the stand.

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 control member.

Fig. 11 is an exploded view of the operating member, the clamp spring, and the cover plate.

In the figure, 1, a bracket; 1a, mounting plates; 1a1, connecting hole; 2. a belt shaft; 2a, a movable half shaft; 2a1, a limit pin; 2b, a fixed half shaft; 2b1, locating pins; 3. a ratchet wheel; 3a, inserting holes I; 3b, a yielding groove; 3c, a connecting part; 3d, inserting holes II; 4. a handle; 5. a handle; 6. an operating control member; 6a, fixing the groove I; 6b, fixing a groove II; 6c, a yielding hole; 6d, mounting grooves; 6e, a cover plate; 6e1, vias; 6f, rubbing strips; 7. a clamping piece; 7a, an annular convex edge; 7b, a chamfered portion; 7c, a guide surface; 7d, a clamping groove; 8. a clamp spring; 8a and a clamping part.

Detailed Description

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

Example one

As shown in figures 1-11, the tensioner comprises a bracket 1, a belt shaft 2, a ratchet wheel 3, a handle 4 and a handle 5. The support 1 is provided with two oppositely arranged mounting plates 1a, the mounting plates 1a are provided with connecting holes 1a1, the number of the ratchet wheels 3 is two, the two ratchet wheels 3 are respectively positioned at the opposite sides of the two mounting plates 1a, the opposite sides of the two ratchet wheels 3 are respectively provided with a connecting part 3c protruding in a cylindrical shape, and the connecting parts 3c are rotatably connected in the corresponding connecting holes 1a 1. The handle 4 is provided with two opposite connecting plates, the connecting plates are provided with mounting holes, one side of each ratchet wheel 3, which is back to the back, is provided with a protruding cylindrical rotating part, and the rotating parts are rotatably connected in the corresponding mounting holes. The two connecting plates of the handle 4 are respectively provided with a long strip-shaped sliding groove, the handle is provided with a plate-shaped limiting part, two sides of the limiting part are connected in the two sliding grooves in a sliding manner, the support 1 is provided with a limiting groove, and the limiting part of the handle can be clamped into the tooth grooves of the limiting groove and the ratchet wheel 3 or the limiting part of the handle. Can be merely snapped into the gullet of the ratchet wheel 3.

Specifically, the belt shaft 2 comprises a movable half shaft 2a and a fixed half shaft 2b, the sections of the movable half shaft 2a and the fixed half shaft 2b along the radial direction are semicircular, the connecting parts 3c of the two ratchet wheels 3 are respectively provided with a first plug hole 3a and a second plug hole 3d, and the first plug hole 3a and the second plug hole 3d are both 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 arranged in the two inserting holes 3d in a penetrating way, and the two positioning pins 2b1 are respectively positioned on one side of the two ratchet wheels 3 back to each other, so that the fixed half shaft 2b is axially positioned on the support 1. The movable half shaft 2a sequentially penetrates through the first inserting holes 3a of the two ratchet wheels 3 and can axially slide relative to the two ratchet wheels 3.

Move semi-axis 2 a's outer end and be fixed with and control a 6, it is fixed with jump ring 8 on controlling a 6, the both ends of jump ring 8 are all inwards buckled and are formed banding joint portion 8a, be equipped with joint spare 7 on the semi-axis 2b, joint spare 7 is the column, the one end of joint spare 7 links firmly the tip at semi-axis 2b, the other end has along radial convex annular protruding edge 7a, the annular protruding one end along 7a has chamfer portion 7b that is the round platform form, form annular draw-in groove 7d between the terminal surface of the other end and semi-axis 2b, and two joint portions 8a all block in draw-in groove 7d, draw-in groove 7d forms the spigot surface 7c that is the taper near one side cell wall of chamfer portion 7b, the tapering of chamfer portion 7b is less than the tapering of spigot surface 7 c.

Furthermore, control piece 6 and be the column, control and seted up fixed slot 6a and two fixed slots 6b on 6 respectively, the outer end of dynamic half axle 2a wears to establish in fixed slot 6a and links firmly mutually with control piece 6. The hole 6c of stepping down that can supply joint spare 7 to stretch into has been seted up to fixed slot two 6 b's diapire, has still seted up mounting groove 6d on fixed slot two 6 b's the diapire, and the drill way part of the hole 6c of stepping down is located mounting groove 6d, and jump ring 8 inlays to be established in mounting groove 6d and two joint portions 8a all are located the drill way department of the hole 6c of stepping down. A cover plate 6e capable of covering the mounting groove 6d is further fixed on the bottom wall of the second fixing groove 6b, and a through hole 6e1 opposite to the yielding hole 6c is formed in the cover plate 6 e.

The inner end of the movable half shaft 2a is provided with a limiting pin 2a1 which is arranged along the radial direction of the movable half shaft 2a in a protruding mode and can abut against the two ratchet wheels 3, a yielding groove 3b communicated with the first plug-in hole 3a is formed in a connecting portion 3c of the ratchet wheel 3 far away from the operation control piece 6, when the movable half shaft 2a and the fixed half shaft 2b are axially positioned due to the fact that the operation control piece 6 and the clamping piece 7 are mutually clamped, the limiting pin 2a1 is embedded into the yielding groove 3b and cannot abut against the bandage, the winding of the bandage is prevented from being affected, and at the moment, the operation control piece 6 abuts against a positioning pin 2b1 on the corresponding end portion of the fixed half shaft 2 b. The peripheral wall of the operating member 6 is provided with a plurality of friction strips 6f for facilitating force application.

When the tensioner has the phenomenon of icing at low outside temperature, or the bandage has fluffing, or the middle part of the bandage has knotting, the bracket 1 can be held by one hand, the operation control part 6 is held by the other hand to be pulled outwards, the two clamping parts 8a are gradually propped open towards two sides and separated from the clamping groove 7d under the action of the conical guide surface 7c, and the clamping spring 8 is elastically deformed, so that the positioning of the movable half shaft 2a and the fixed half shaft 2b is released, and the movable half shaft 2a can be outwards pulled out to be separated from one ratchet wheel 3. Then, the binding band is attached to the side face of the fixed half shaft 2b, the operation control piece 6 is pushed inwards, under the action of the chamfer portion 7b, the two clamping portions 8a can be opened again to be clamped into the clamping groove 7d again, the movable half shaft 2a is inserted into the ratchet wheel 3 again, the movable half shaft 2a and the fixed half shaft 2b are located, the binding band is located between the fixed half shaft 2b and the movable half shaft 2a, the binding band penetrates through the fixed half shaft 2b and the movable half shaft 2a, and the whole operation process can be completed by a single person, and the operation is simple and convenient. Moreover, the structure for axially positioning the movable half shaft 2a is completed through a matching structure between the movable half shaft 2a and the fixed half shaft 2b, and is not connected with the handle 5, so that when the handle 5 is pulled upwards to separate the handle from the ratchet wheel 3 and the bracket 1 in the process that the tightener needs to wind up the binding band for tightening, the movable half shaft 2a is always in an axially positioned state through the mutual clamping action of the operating piece 6 and the clamping piece 7, and even if an operator accidentally touches the movable half shaft 2a, the actuating half shaft 2a cannot be led to fall off from the ratchet wheel 3 as long as the acting force does not exceed the elastic clamping force between the operating piece and the clamping piece.

Example two

The tensioner of this embodiment is substantially the same as the first embodiment, except that:

the clamping spring 8 is fixed on the operating part 6, two ends of the clamping spring 8 are inwards bent to form a strip-shaped clamping part 8a, the clamping part 7 is columnar and is fixedly connected to the end part of the fixed half shaft 2b, the free end of the clamping part 7 is provided with a chamfer in a round table shape, clamping grooves 7d which are symmetrically arranged are formed in the peripheral wall of the clamping part 7, the two clamping parts 8a are respectively clamped into the corresponding clamping grooves 7d, and the groove wall of one side, close to the chamfer part 7b, of the clamping groove 7d forms an inclined guide surface 7 c.

EXAMPLE III

The tensioner of the present embodiment is different from the first embodiment in that: the control part 6 is provided with two oppositely arranged clamping feet, the two clamping feet are respectively provided with a clamping head with a trapezoidal cross section, the clamping part 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 heads are respectively clamped into the corresponding clamping grooves. The elastic clamping between the control member 6 and the fixed half shaft 2b can be realized through the matching mode of the two clamping feet and the clamping holes.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms of the bracket 1, the mounting plate 1a, the connecting hole 1a1, the belt shaft 2, the dynamic half shaft 2a, etc. are used more extensively herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to the spirit of the present invention.

Claims

1. A tensioner comprises a support (1), a belt shaft (2) and a ratchet wheel (3) rotatably connected to the support (1), wherein the belt shaft (2) comprises a movable half shaft (2a) and a fixed half shaft (2b), the fixed half shaft (2b) is fixed with the ratchet wheel (3), the movable half shaft (2a) is in sliding insertion with the ratchet wheel (3) along the axial direction, the tensioner is characterized in that an operating part (6) is fixed at the outer end of the movable half shaft (2a), a clamping part (7) is arranged on the fixed half shaft (2b), the operating part (6) and the clamping part (7) are in elastic clamping to axially position the movable half shaft (2a) and the fixed half shaft (2b), and the operating part (6) is pulled outwards along the axial direction of the movable half shaft (2a) to overcome the elastic clamping force so that the operating part (6) and the clamping part (7) can be separated from each other to release clamping.

2. A tensioner according to claim 1, characterized in that a clamping spring (8) is fixed on the operating member (6), both ends of the clamping spring (8) are bent inward to form a strip-shaped clamping portion (8a), the clamping member (7) is in a column shape, one end of the clamping member (7) is fixedly connected to the end portion of the fixed half shaft (2b), the other end of the clamping member has a radially protruding annular flange (7a), one end of the annular flange (7a) has a truncated cone-shaped chamfer portion (7b), an annular clamping groove (7d) is formed between the other end and the end surface of the fixed half shaft (2b), both clamping portions (8a) are clamped into the clamping groove (7d), and a tapered guide surface (7c) is formed on a groove wall of one side of the clamping groove (7d) close to the chamfer portion (7 b).

3. A tensioner according to claim 2, characterised in that the taper of the chamfer (7b) is less than the taper of the guide surface (7 c).

4. The tensioner according to claim 1, wherein the operating member (6) is fixed with a clamp spring (8), both ends of the clamp spring (8) are bent inward to form a strip-shaped clamping portion (8a), the clamping member (7) is columnar and is fixedly connected to the end portion of the fixed half shaft (2b), the free end of the clamping member (7) is provided with a truncated cone-shaped chamfer, the peripheral wall of the clamping member (7) is provided with two symmetrically arranged clamping grooves (7d), the two clamping portions (8a) are respectively clamped into the corresponding clamping grooves (7d), and the groove wall of one side of the clamping groove (7d) close to the chamfer portion (7b) forms an inclined guide surface (7 c).

5. The tensioner according to claim 2, 3 or 4, wherein the operating member (6) is cylindrical, a first fixing groove (6a) and a second fixing groove (6b) are respectively formed in the operating member (6), the outer end of the movable half shaft (2a) penetrates through the first fixing groove (6a) and is fixedly connected with the operating member (6), a yielding hole (6c) into which the clamping member (7) can extend is formed in the bottom wall of the second fixing groove (6b), the clamping spring (8) is fixed in the second fixing groove (6b), and the two clamping portions (8a) are located at the hole of the yielding hole (6 c).

6. The tensioner according to claim 5, wherein a mounting groove (6d) is further formed in the bottom wall of the second fixing groove (6b), the opening of the abdicating hole (6c) is partially located in the mounting groove (6d), the clamp spring (8) is embedded in the mounting groove (6d), a cover plate (6e) capable of covering the mounting groove (6d) is further fixed on the bottom wall of the second fixing groove (6b), and a through hole (6e1) opposite to the abdicating hole (6c) is formed in the cover plate (6 e).

7. A tensioner according to claim 1, wherein the operating member (6) has two opposite clamping legs, each of the two clamping legs has a clamping head with a trapezoidal cross section, the clamping member (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 legs can extend into the clamping holes, and the two clamping heads are respectively clamped into the corresponding clamping grooves.

8. The tensioner according to claim 1 or 2 or 3 or 4 or 7, wherein the bracket (1) is provided with two oppositely arranged mounting plates (1a), the number of the ratchet wheels (3) is two, the two ratchet wheels (3) are respectively and rotatably connected to the two mounting plates (1a), each of the two ratchet wheels (3) is provided with a first insertion hole (3a) through which the movable half shaft (2a) can be slidably inserted, the inner end of the movable half shaft (2a) is provided with a limiting pin (2a1) which is radially protruded and can abut against the two ratchet wheels (3), the ratchet wheel (3) far away from the operating member (6) is provided with a abdicating groove (3b) communicated with the first insertion hole (3a), and when the operating member (6) and the clamping member (7) are mutually clamped, the limiting pin (2a1) is embedded into the abdicating groove (3 b).

9. The tensioner according to claim 8, wherein the opposite sides of the two ratchet wheels (3) are provided with connecting parts (3c) protruding in a cylindrical shape, the mounting plate (1a) is provided with a connecting hole (1a1), the connecting parts (3c) are rotatably connected in the corresponding connecting holes (1a1), the connecting parts (3c) of the two ratchet wheels (3) are provided with the first inserting holes (3a), and the receding groove (3b) is formed in the connecting part (3c) of the ratchet wheel (3) far away from the operating part (6).

10. A tensioner according to claim 1 or 2 or 3 or 4 or 7, characterized in that both ends of said fixed half shaft (2b) are provided with positioning pins (2b1), said operating members (6) abutting against positioning pins (2b1) on the corresponding ends of said fixed half shaft (2b) when said operating members (6) and said snap-in members (7) are snapped into each other.