CN113153122A

CN113153122A - Automatic rebounding roller shutter mechanism and tensioning force adjusting method

Info

Publication number: CN113153122A
Application number: CN202110449310.1A
Authority: CN
Inventors: 李亚庆
Original assignee: Jiangsu Krius Machine Tool Accessories Co ltd
Current assignee: Jiangsu Krius Machine Tool Accessories Co ltd
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2021-07-23

Abstract

The invention discloses an automatic rebounding roller shutter mechanism.A rotatable winding drum is sleeved outside a fixed non-rotating central shaft through bearings at two ends; the spring is sleeved on the central shaft, one end of the spring and the end part of one side of the winding drum are fixed and can synchronously rotate, the other end of the spring is fixed on a guide sleeve which can axially slide along the central shaft but can not rotate, and the free length of the spring is shorter than that of the central shaft. The fixed end of the spring is fixed with one end of the winding drum, the movable end of the spring is arranged on the guide sleeve capable of moving along the axial direction, the torsion force of the winding drum is converted into the thrust force moving along the axial direction, the expansion of the spring and the sliding of the guide sleeve are realized, the guide sleeve at the movable end only passively bears the thrust force, the stress is relatively moderate and even, the sliding is smooth, the clamping or the damage is not easy, the damage caused by the overlarge stress of the sliding end is avoided, and the sliding section can be protected to have a longer service life; and meanwhile, the radial deformation of the spring is relieved, and the spring is protected.

Description

Automatic rebounding roller shutter mechanism and tensioning force adjusting method

Technical Field

The invention relates to the technical field of roller shutters, in particular to an automatic rebounding roller shutter mechanism and a tensioning force adjusting method.

Background

The roller shutter mechanism can achieve the isolation effects of shading, rain shielding, wind shielding, protection and the like, and Chinese patent ZL2018207264894 discloses a roller shutter type speed-reducing hidden screen window which comprises a yarn box, a left yarn box plug, a right yarn box plug, two guide rails, a yarn net, a pull beam, a bottom frame and a yarn net speed-reducing rewinding mechanism, wherein the two ends of the yarn box are respectively and correspondingly provided with the left yarn box plug and the right yarn box plug; the upper end of the gauze is arranged in the gauze box through a gauze speed-reducing rewinding mechanism, and the lower end of the gauze is fixed with the straining beam; the gauze deceleration backrush mechanism is arranged in the gauze box and comprises a left sleeve, a damper, a middle body, a torsion spring, a gauze reelpipe, a right sleeve and a right bearing seat. The intermediate body of the roller shutter structure is meshed with a clamping belt in a yarn net roller pipe, the intermediate body and the roller pipe synchronously rotate, and a spring is pulled to stretch, so that the forming and manufacturing of the meshed part on the inner periphery of the roller pipe are difficult, and the unsmooth sliding is easily caused; especially, the movable end of the spring is firstly subjected to the rotating torsion and then is transmitted to the spring to deform, so that the movable end is stressed greatly and is easy to clamp or damage.

Disclosure of Invention

The applicant provides a rolling blind mechanism with reasonable structure and automatic resilience, aiming at the defects that a spring of the internal structure of a winding drum in the rolling blind machine is easy to damage in the existing production, the fixed end of the spring is fixed with one end of the winding drum, the movable end of the spring is arranged on a guide sleeve capable of moving along the axial direction, the torsion of the winding drum is converted into the thrust force moving along the axial direction, the stretching of the spring and the sliding of the guide sleeve are realized, the guide sleeve of the movable end only passively bears the thrust force, the stress is relatively relaxed and average, and therefore the sliding is smooth and easy, and the rolling blind mechanism is not easy to block or damage.

The technical scheme and the beneficial effects adopted by the invention are as follows:

a roller shutter mechanism with automatic rebound is characterized in that a rotatable winding drum is sleeved outside a fixed non-rotating central shaft through bearings at two ends; the spring is sleeved on the central shaft, one end of the spring and the end part of one side of the winding drum are fixed and can synchronously rotate, the other end of the spring is fixed on a guide sleeve which can axially slide along the central shaft but can not rotate, and the free length of the spring is shorter than that of the central shaft. The fixed end of the spring is fixed with one end of the winding drum, the movable end of the spring is arranged on the guide sleeve capable of moving along the axial direction, the torsion force of the winding drum is converted into the thrust force moving along the axial direction, the expansion of the spring and the sliding of the guide sleeve are realized, the guide sleeve at the movable end only passively bears the thrust force, the stress is relatively moderate and even, the sliding is smooth, the clamping or the damage is not easy, the damage caused by the overlarge stress of the sliding end is avoided, and the sliding section can be protected to have a longer service life; meanwhile, the radial deformation of the spring is relieved, the spring is protected, and the irreversible damage caused by excessive deformation of the spring is prevented.

As a further improvement of the above technical solution:

the cord fabric is wound on the winding drum, when the winding drum rotates, the fixed end of the spring is driven to rotate, the guide sleeve axially slides on the central shaft to stretch the spring to form elastic force, and when the cord fabric is loosened, the spring is restored to drive the winding drum to rotate. The part of the twisting force is converted into thrust moving along the axial direction, the radial deformation of the spring is relieved, the spring is protected, and the irreversible damage caused by excessive deformation of the spring is prevented.

The section of the central shaft at least in the sliding area of the guide sleeve is polygonal, and a polygonal hole which is matched with the sliding section in shape and is in clearance fit with the sliding section is formed in the guide sleeve. The radial limit of the sleeve is realized by the matching of the shape of the main body part in the middle of the central shaft and the sleeve, and the sleeve can axially slide on the central shaft along the central shaft, so that the twisting force is partially converted into the thrust moving along the axial direction, and the aim of protecting the spring and the guide sleeve is fulfilled. The polygonal central shaft can be directly manufactured by using sectional materials, so that the processing is easy, the cost is low, the corresponding inner hole of the guide sleeve is easy to process, and the manufacture of a complex winding drum internal structure in the prior art is avoided.

The clamping seats are fixed at two ends of the housing, the flat surfaces of the thin round parts at two ends of the central shaft are erected in the U-shaped grooves of the clamping seats, threaded holes are formed in the thin round parts, through holes are formed in the positions, corresponding to the threaded holes, of the side walls of the housing, and the thin round parts are fixed on the housing through the cooperation of fasteners, the threaded holes and the through holes. The invention can realize the fixation of the thin round part in the clamping seat through the matching of the threaded hole, the clamping seat, the through hole and the fastener, and simultaneously, the flat strip surface is matched with the U-shaped groove of the clamping seat of the housing, thereby limiting the central shaft from rotating and finally enabling the spring to generate a tightening force when the winding drum rotates.

The spring is a winding spring, corresponding grooves are formed in the outer surfaces of the long bearing seat and the guide sleeve, and the spring is wound into the grooves to be fixed. The invention winds the two ends of the spring in the grooves of the sleeves at the two sides, has convenient assembly and firm fixation, saves parts and reduces the manufacturing cost.

Two ends of the central shaft are respectively connected with the winding drum through the long bearing seat, the short bearing seat and the internal bearing, and two ends of the winding drum are fixed with the long bearing seat and the short bearing seat through fasteners. The winding drum is fixed with the bearing seats, so that the winding drum can drive the long bearing seat and the short bearing seat to rotate when rotating, and the long bearing seat drives one end of the spring to rotate to generate a twisting force.

A guide shaft parallel to the central shaft is also arranged in the housing. The guide shaft can change the rolling direction of the protective curtain, so that the protective curtain is suitable for more use occasions.

A scraper is arranged at the curtain cloth outlet of the guide shaft. The scraper can scrape oil stains on the protective curtain.

The section of the central shaft is regular hexagon, square or regular octagon. The cross-sectional shape of the central shaft is not limited as long as it can achieve the purpose of restricting the radial movement of the sleeve and ensuring that it can move in the axial direction.

The tension adjusting method of the automatic rebounding curtain rolling mechanism is characterized in that the innermost end edge of the curtain cloth is fixed on the winding drum, the winding drum is rotated for a plurality of circles in the direction opposite to the drawing direction of the curtain cloth before the curtain cloth is drawn out, then the curtain cloth is drawn out, and at the moment, the tension of the curtain cloth can be pre-adjusted. The movable end of the spring is arranged on the guide sleeve capable of moving along the axial direction, the fixed end is stressed, the twisting force is converted into the spring tension and the thrust moving along the axial direction, and the guide sleeve is pushed to slide, so that the damage caused by the overlarge stress on the sliding end is avoided, and the sliding section can be protected to have longer service life. According to the invention, the internal guide sleeve slides for a certain distance through the idle rotation winding drum and pre-tensions the spring, so that the tension of the cord fabric with stronger hand feeling is generated, the tension can be loosened or tightened according to different working conditions and requirements, the use environment is more flexible, or the relaxation of the spring force after long-term use is avoided.

Drawings

Fig. 1 is a schematic structural view of the present invention with a part of the housing removed.

Fig. 2 is a left side view of fig. 1.

Fig. 3 is a sectional view of section a-a in fig. 2.

Fig. 4 is an enlarged view at B in fig. 3.

Fig. 5 is an enlarged view at C in fig. 3.

Fig. 6 is a perspective view of the guide sleeve of the present invention.

In the figure: 1. a card holder; 2. a housing; 3. a threaded hole; 4. a reel; 5. a short shaft bearing; 6. a guide shaft; 7. a squeegee; 8. a protective curtain; 9. a fixing strip; 10. a via hole; 11. a central shaft; 12. a guide sleeve; 13. a spring; 14. a long bearing seat; 15. a bearing; 16. a thin section; 17. a slipping section; 18. a thin circular portion; 19. a step; 20. coarse section; 21. a groove; 22. polygonal holes.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 to 3, the automatic rebounding roller shutter mechanism of the present invention has a strip-shaped housing 2, a central shaft 11 with a substantially equivalent length is disposed in the housing 2, clamping seats 1 are disposed on inner sidewalls of two ends of the housing 2, the central shaft 11 is made of a hexagonal bar material with a regular hexagonal cross section, and may have other polygonal cross sections in other embodiments; as shown in fig. 4 and 5, the two ends of the central shaft 11 are processed into thin round parts 18 with flat surfaces, and the thin round parts are clamped in the U-shaped grooves of the clamping seats 1 at the two ends of the housing 2 and are stopped rotating through the flat surfaces. The centers of the two ends are provided with threaded holes 3, the side wall of the housing 2 is provided with through holes 10 corresponding to the positions of the threaded holes 3, and a central shaft 11 erected on the clamping seat 1 is fixed in the housing 2 by penetrating the through holes 10 from the outside through fasteners matched with the threaded holes 3.

As shown in fig. 3 to 5, a winding spring 13 is fitted around the outer periphery of the center shaft 11, and the free length of the spring 13 in a relaxed state is shorter than the length of the center shaft 11. The long bearing seat 14 and the short bearing seat 5 are respectively sleeved on the thin round parts 18 at two ends of the central shaft 11, the bearings 15 which are matched with the thin round parts 18 and roll are embedded in the long bearing seat 14 and the short bearing seat 5, the periphery of the long bearing seat 14 facing to the inner side is provided with a step 19, the outer surface of the thin section 16 of the step 19 facing to the inner side is provided with a spring clamping and embedding groove, one end of a spring 13 is sleeved on the thin section 16 of the long bearing seat 14, the other end of the spring is sleeved on a guide sleeve 12 with a groove 21 on the surface, the center of the guide sleeve 12 is a regular hexagonal polygonal hole 22 matched with the cross section shape of the central shaft 11, and the guide sleeve 12 is radially limited by the central shaft 11 after being sleeved, but can axially move in the sliding section 17 area of the central shaft 11. When the fixed end of the spring 13 is deformed by the tightening force, the tightening force is converted into a thrust force moving along the axial direction, and the movable end guide sleeve 12 of the spring 13 is pushed to slide axially. The long bearing seat 14 and the short bearing seat 5 are sleeved with the winding drum 4, and two ends of the winding drum 4 are fixed with the thick section 20 of the bearing sleeve of the long bearing seat 14 and the bearing sleeve of the short bearing seat 5 through fasteners, or are in interference fit.

As shown in fig. 1 and 2, a curtain cloth 8 outlet is arranged on the housing 2 corresponding to the rolling direction of the curtain cloth 8, the curtain cloth 8 is wound on the winding drum 4, the innermost end edge of the curtain cloth 8 is fixed on the winding drum 4, a fixing strip 9 is arranged at the outer end edge, the width of the fixing strip 9 is larger than that of the curtain cloth 8 outlet, and the fixing strip 9 can prevent the curtain cloth 8 from being completely retracted into the housing 2. The housing 2 is also internally provided with a guide shaft 6 parallel to the central shaft 11, a strip-shaped scraper 7 is arranged on a strip-shaped plate close to the outlet of the curtain cloth 8 of the guide shaft 6, and the guide shaft 6 can change the rolling direction of the curtain cloth 8, so that the curtain cloth can be pulled out at different angles to avoid being stuck, thereby being suitable for more use occasions, and the scraper 7 can scrape oil stains on the curtain cloth 8.

When the curtain fabric winding machine works, firstly, one end edge of the innermost part of the curtain fabric 8 is fixed on the winding drum 4, then the curtain fabric 8 is wound on the winding drum 4 and a part of the curtain fabric 8 is reserved outside an outlet of the curtain fabric 8, the fixing strip 9 is arranged on the other end edge of the curtain fabric 8 outside the outlet of the curtain fabric 8, when the fixing strip 9 of the curtain fabric 8 is pulled forcibly, the winding drum 4 rotates along with the curtain fabric 8, the winding drum 4 drives the long bearing seat 14 and the spring 13 sleeved on the long bearing seat to rotate together, at the moment, the central shaft 11 is fixed, the spring 13 sleeved on the guide sleeve 12 cannot rotate due to the fact that the guide sleeve 12 is limited in the radial direction by the central shaft 11, the length of the spring 13 is increased due to the rotating force received by one end of the spring 13, outward thrust is generated to push the guide sleeve 12 to move outwards, and meanwhile. Because the spring 13 is in a stressed state of twisting deformation, the curtain cloth 8 is pulled back into the housing 2 at the curtain cloth 8 fixing strip 9, and the curtain cloth 8 automatically rebounds and gathers when the force pulling the fixing strip 9 is withdrawn.

The invention can also adjust the pulling force of the curtain cloth 8, when in installation, firstly, the innermost end edge of the curtain cloth 8 is fixed on the winding drum 4, then the curtain cloth 8 is completely wound on the winding drum 4, the winding drum 4 is rotated inwards (in the opposite direction of pulling the curtain cloth 8) for a plurality of circles, the more the pulling force is, when the curtain cloth is rotated to the proper pulling force, a part of the curtain cloth 8 is loosened to the outside of the outlet, and the edge of the curtain cloth 8 outside the outlet is provided with the fixing strip 9. In this operating state, the spring 13 is already under a certain tension in the initial state, and if the curtain 8 is pulled, more tension is needed to make the tension deformation of the spring 13 more serious, so that the required tension is increased, and the tension of the curtain 8 can be adjusted by the method.

The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the invention may be modified in any manner without departing from the spirit thereof.

Claims

1. The utility model provides an automatic roll up curtain mechanism of resilience which characterized in that: the rotatable winding drum (4) is sleeved outside the fixed non-rotatable central shaft (11) through bearings at two ends; the spring (13) is sleeved on the central shaft (11), one end of the spring (13) and the end part of one side of the winding drum (4) are fixed and can synchronously rotate, the other end of the spring (13) is fixed on a guide sleeve (12) which can axially slide along the central shaft (11) but cannot rotate, and the free length of the spring (13) is shorter than that of the central shaft (11).

2. The self-rebounding blind mechanism according to claim 1, wherein: the curtain cloth (8) is wound on the winding drum (4), when the winding drum (4) rotates, the fixed end of the spring (13) is driven to rotate, the guide sleeve (12) axially slides on the central shaft (11) to stretch the spring (13) to form elastic force, and when the curtain cloth (8) is loosened, the spring (13) restores to drive the winding drum (4) to rotate.

3. The self-rebounding blind mechanism according to claim 1, wherein: the section of the central shaft (11) at least in the sliding area of the guide sleeve (12) is polygonal, and a polygonal hole (22) which is matched with the sliding section (17) in shape and is in clearance fit with the sliding section is formed in the guide sleeve (12).

4. The self-rebounding blind mechanism according to claim 1, wherein: the clamping seats (1) are fixed at two ends of the housing (2), the flat surfaces of the thin circular parts (18) at two ends of the central shaft (11) are erected in the U-shaped grooves of the clamping seats (1), the threaded holes (3) are formed in the thin circular parts (18), the through holes (10) are formed in the positions, corresponding to the threaded holes (3), of the side wall of the housing (2), and the thin circular parts (18) are fixed on the housing (2) through the matching of fasteners, the threaded holes (3) and the through holes (10).

5. The self-rebounding blind mechanism according to claim 1, wherein: the spring (13) is a winding spring, corresponding grooves (21) are formed in the outer surfaces of the long bearing seat (14) and the guide sleeve (12), and the spring (13) is wound into the grooves (21) to be fixed.

6. The self-rebounding blind mechanism according to claim 1, wherein: two ends of the central shaft (11) are respectively connected with the winding drum (4) through the long bearing seat (14), the short shaft bearing seat (5) and the inner bearing (15), and two ends of the winding drum (4) are fixed with the long bearing seat (14) and the short shaft bearing seat (5) through fasteners.

7. The self-rebounding blind mechanism according to claim 1, wherein: a guide shaft (6) parallel to the central shaft (11) is also arranged in the housing (2).

8. The self-rebounding blind mechanism according to claim 1, wherein: a scraper (7) is arranged at the outlet of the cord fabric (8) of the guide shaft (6).

9. The self-rebounding blind mechanism according to claim 1, wherein: the section of the central shaft (11) is regular hexagon, square or regular octagon.

10. A tension adjusting method using the self-rebounding roll screen mechanism according to claim 1, characterized in that: the innermost end edge of the curtain cloth (8) is fixed on the winding drum (4), before the curtain cloth (8) is pulled out, the winding drum (4) is rotated for a plurality of circles in the opposite direction of the pulling direction of the curtain cloth (8), then the curtain cloth (8) is pulled out, and at the moment, the tension force of the curtain cloth (8) can be pre-adjusted.