CN213573814U

CN213573814U - Wear-resistant anti-lifting rail and wind-proof roller shutter with same

Info

Publication number: CN213573814U
Application number: CN202021263270.9U
Authority: CN
Inventors: 陈超华
Original assignee: Chengbao Curtain Alliance Guangdong Sunshade Technology Co ltd
Current assignee: Chengbao Curtain Alliance Guangdong Sunshade Technology Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-06-29
Anticipated expiration: 2030-06-30

Abstract

The utility model provides a wear-resistant anti-lifting rail and a windproof roller shutter with the same, the wear-resistant anti-lifting rail comprises a lateral guide rail body, a guide groove is arranged on the lateral guide rail body, two inner side walls at the groove opening of the guide groove are both provided with extending baffles with opposite free ends, the free ends of the two extending baffles are both provided with smooth panels extending to the inside or the outside of the guide groove, a gap between the two smooth panels forms a fabric passage for fabric to pass through, the smooth panel made of PVC plays a role in reducing the friction coefficient between the smooth panel and the fabric so as to realize the purpose of delaying the fabric abrasion, prolong the service life and hide a zipper guide component, a main guide rail plate and an auxiliary guide rail plate which are made of aluminum alloy materials in split design can realize the purpose of combined installation only through the mutual matching of a clamping groove and a clamping strip, the assembly parts such as screws and the like can be assembled without being adopted, so that the installation is very convenient, the installation precision is high, and the appearance is more attractive.

Description

Wear-resistant anti-lifting rail and wind-proof roller shutter with same

Technical Field

The utility model relates to a prevent wind a roll of curtain field, concretely relates to wear-resisting anti rail of lifting and have this wear-resisting anti wind a roll of curtain of lifting rail.

Background

The wind-proof rolling curtain is more and more popular because of the wind-proof and lift-proof function, and the main structural proposal of the traditional wind-proof rolling curtain on the lift-proof design is as follows: as shown in figure 1, guide grooves 1 are designed in two opposite lateral guide rails, zippers 17 are designed on two sides of the fabric 4, then zipper guide pieces 15 for the zippers 17 to slide are designed in the guide grooves 1, and then the anti-lifting purpose can be achieved only by limiting the zipper guide pieces 15 in the guide grooves 2.

At present, the existing windproof roller shutter is simpler in anti-lifting limit design of a zipper guide 15, basically, extension baffles 2 with opposite free ends are designed on two inner side walls at the groove opening of a guide groove 1, the anti-lifting limit purpose is realized through the stop limit function of the two extension baffles 2, in addition, in the actual design, the distance between the two oppositely arranged extension baffles 2 is designed to be slightly larger than the thickness of a fabric 4, namely, the necking design is carried out, the necking design of the extension baffles 2 can play a role of effectively reducing the swing amplitude of the fabric 4 and realize the aesthetic design purpose of hiding the zipper guide 15, but because the end walls of the free ends of the two extension baffles 2 are difficult to carry out plane polishing treatment in the manufacturing process, the necking structure is easy to scrape and grind the fabric 4 in the movement process of ascending or descending the fabric 4, the service life of the fabric 4 is reduced.

SUMMERY OF THE UTILITY MODEL

The end wall of two free ends that extend the baffle to the current of preventing wind book curtain mentioned in the background art is difficult to carry out the plane polishing in making and handles, and then appears scraping the technical problem of wearing and grinding the surface fabric easily, the utility model provides a wear-resisting anti rail of lifting and have this wear-resisting anti wind book curtain of lifting of rail.

An object of the utility model is to disclose a wear-resisting anti rail of lifting, including the side direction guide body, be equipped with the guide way on the side direction guide body, all be equipped with the relative extension baffle that sets up of free end on two inside walls of guide way notch department, two extend all to be equipped with on the free end of baffle and extend to the inside or the outside smooth panel of guide way, two clearance between the smooth panel forms the surface fabric passageway that is used for the surface fabric to pass through, is convenient for carry out surface machining's smooth panel through all designing on two free ends of extending the baffle to reduce the coefficient of friction between smooth panel and the surface fabric, in order to realize delaying the purpose of surface fabric wearing and tearing, and then realize improving surface fabric life's purpose.

Further, two extend and be equipped with the hook groove on the free end of baffle, two smooth panel all be equipped with hook groove matched with barb, smooth panel passes through the barb cooperation is installed on the hook groove to the realization is installed smooth panel extend the free purpose of serving of baffle.

Further, two interval between the smooth panel is less than two interval between the free end of extending the baffle, and two interval between the smooth panel is greater than the thickness of surface fabric, so, can play the effect of avoiding the surface fabric to contact with the end wall of two free ends that extend the baffle, ensure that the surface fabric is not scraped by the baffle that extends and grind, and can also further reduce the effect of surface fabric amplitude of oscillation to and further realize hiding the aesthetic design purpose of zip fastener guide.

Furthermore, the smooth panel is made of Polyvinyl chloride (PVC), the PVC material has the advantages of easy processing and production, the production cost is low, the surface smoothness of the produced panel is very good, and the purpose of reducing the friction coefficient with the fabric can be achieved, so as to improve the wear resistance.

Furthermore, the side edge of the smooth panel is provided with a fillet, and the smooth panel after fillet treatment is more favorable for the lifting operation of the fabric.

Further, the lateral guide rail body comprises a main guide rail plate and an auxiliary guide rail plate, one side of the main guide rail plate is provided with a clamping groove, the side wall of the clamping groove is provided with a protrusion, one side of the auxiliary guide rail plate is provided with a clamping strip matched with the clamping groove, the clamping strip is provided with a groove, the protrusion is matched with the groove, the auxiliary guide rail plate is installed on the main guide rail plate through the clamping strip in a matched mode, the main guide rail plate and the auxiliary guide rail plate are made of aluminum alloy sections, the main guide rail plate and the auxiliary guide rail plate are integrally formed by aluminum alloy, the lateral guide rail body is light in weight, required installation parts are few, and compared with the main guide rail plate and the auxiliary guide rail plate which are integrally formed by aluminum alloy sections, the lateral guide rail body is fixedly installed by using screws in a traditional structural mode, the problem of low assembling precision is easily caused by different tightening forces of the screws during installation, the purpose of installing the main guide rail plate and the auxiliary guide rail plate can be achieved only through the matching of the clamping strips and the clamping grooves, and the installation and the fixation are carried out without screws, so that the installation precision and the attractiveness of the wear-resistant anti-lifting rail are improved.

Furthermore, a middle partition board is arranged in the middle of the main guide rail board, the guide groove is formed by the middle partition board and the space between the two extension baffle boards, a zipper guide assembly is arranged in the guide groove, the zipper guide assembly is provided with a zipper slide cavity for the zipper to slide, the zipper on the fabric is arranged on the zipper slide cavity in a sliding manner, the side wall of the zipper guide assembly, which is close to the two extension baffle boards, is provided with elastic sponge or rubber elastic cushion or spring, the fabric is used as a shading material for blocking the sunlight of the external environment, and the surface temperature of the fabric can be greatly changed along with the alternate temperature difference change at day and night, so that the problem that the fabric is separated from the zipper guide assembly due to the deformation caused by heating or cooling is solved, the elastic sponge or rubber elastic cushion or spring is designed on the side wall of the zipper guide assembly, which is close to the two extension baffle boards, so that an elastically resettable deformation space can be formed between the, the zipper guide assembly is prevented from being separated from the zipper guide assembly due to deformation, and the stability of the product is improved.

Another aim at discloses a prevent wind book curtain, all be equipped with the zip fastener or draw the surface fabric of pearl on the both sides, still include the top cover, rotate and install reelpipe and drive in the top cover reelpipe pivoted tubular motor, surface fabric top coiling is installed on the reelpipe, top cover both sides end all is equipped with as above wear-resisting anti rail of lifting, the zip fastener or draw the pearl to slide and set up in the zip fastener sliding cavity, through the wear-resisting anti rail of lifting of both sides end design at the top cover, realize delaying the purpose of surface fabric wearing and tearing, and then realize improving surface fabric life's purpose.

Further, still include the counter weight roof beam, surface fabric bottom fixed mounting be in on the counter weight roof beam, the main guideway board with all be equipped with on the auxiliary guideway board and extend the curb plate, two space between the extension curb plate forms counter weight roof beam spout, and the tip of counter weight roof beam sets up on the counter weight roof beam spout, and the counter weight roof beam spout is used for spacing direction counter weight roof beam, be equipped with the anticollision strip on the lateral wall of counter weight roof beam spout, because counter weight roof beam weight is great, when the surface fabric received great wind-force and blows, the counter weight roof beam takes place the problem of striking counter weight roof beam spout lateral wall easily, therefore designs the anticollision strip on the lateral wall of counter weight roof beam spout, plays and slows down the effect of counter weight roof beam to wear-resisting anti striking power of lifting.

The utility model has the advantages that: the smooth panel that all designs the material to be PVC on the free end through extending baffle two, in order to reduce the coefficient of friction between smooth panel and the surface fabric, in order to realize the purpose that delays the surface fabric wearing and tearing, and then realize improving surface fabric life's purpose, can also play the effect of hiding the zip fastener direction subassembly, adopt aluminum alloy integrated into one piece's main guide rail board and auxiliary guide rail board, the quality is light, main guide rail board and auxiliary guide rail board with split type form goes on assembling the design, only need can realize the purpose of aggregate erection through mutually supporting of draw-in groove and card strip, need not to adopt external assembly spare to carry out supplementary installation operation like the screw, it is very convenient to install, and the installation accuracy is high, the aesthetic property of this wear-resisting anti rail that lifts has also been improved simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic view of an anti-lift limit structure of a zipper guide in a windproof roller shutter in the prior art;

FIG. 2 is a schematic structural view of the wear-resistant and lifting-resistant rail of the present invention;

FIG. 3 is an exploded view of the wear-resistant and anti-lifting rail of the present invention;

FIG. 4 is a schematic structural view of the wind-proof rolling shutter with wear-resistant and anti-lifting rail of the present invention;

fig. 5 is a schematic structural view of the embodiment 2 in which the smooth panel and the extending baffle are integrated.

The attached drawings are as follows: 1. a guide groove; 2. an extension baffle; 3. a smooth panel; 4. fabric; 5. a hook groove; 6. a barb; 7. rounding off; 8. a main guide rail plate; 9. a guide rail plate; 10. a card slot; 11. a protrusion; 12. clamping the strip; 13. a groove; 14. a middle partition plate; 15. A zipper guide; 16. a zipper guide assembly; 17. a zipper; 18. a zipper slider cavity; 19. an elastic sponge; 20. a machine top cover; 21. pipe coiling; 22. a tubular motor; 23. a counterweight beam; 24. an extension side plate; 25. a counterweight beam chute; 26. and (4) an anti-collision strip.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example 1

Referring to fig. 2 to 3, a wear-resisting anti rail of lifting, including the side direction guide body, be equipped with guide way 1 on the side direction guide body, all be equipped with the relative extension baffle 2 that sets up of free end on two inside walls of guide way 1 notch department, all be equipped with the inside or outside smooth panel 3 that extends to guide way 1 on two free ends that extend baffle 2, clearance formation between two smooth panels 3 is used for the surface fabric passageway that surface fabric 4 passes through, smooth panel 3 of being convenient for carry out surface machining through all designing on two free ends that extend baffle 2, in order to reduce the coefficient of friction between smooth panel 3 and the surface fabric 4, in order to realize delaying the purpose of surface fabric 4 wearing and tearing, and then realize improving the purpose of surface fabric 4 life.

Referring to fig. 2, the free ends of the two extending baffles 2 are provided with hook grooves 5, the two smooth panels 3 are provided with barbs 6 matched with the hook grooves 5, and the smooth panels 3 are matched with the hook grooves 5 through the barbs 6 to be installed on the hook grooves 5, so that the smooth panels 3 can be installed on the free ends of the extending baffles 2.

Preferably, the interval between two smooth panels 3 is less than the interval between two free ends that extend baffle 2, and the interval between two smooth panels 3 is greater than the thickness of surface fabric 4, so, can play the effect of avoiding surface fabric 4 and two end walls that extend the free end of baffle 2 to contact, ensure that surface fabric 4 is not scraped by extension baffle 2 and grind, and can also further reduce the effect of surface fabric 4 swing range, and further realize hiding the aesthetic design purpose of zip fastener guide.

Preferably, the smooth panel 3 is made of PVC (Polyvinyl chloride), which has the advantages of easy processing and production, low production cost, and good surface smoothness of the panel formed by production, so as to achieve the purpose of reducing the friction coefficient with the fabric 4 and improve the wear resistance.

Wherein the thickness of the fabric 4 is between 0.5mm and 2.0mm, and in the actual production, the two extension baffles 2 are integrally manufactured with the lateral guide rail body, namely, after the lateral guide rail body is produced, the distance between the free ends of the two extension baffles 2 is not changed, therefore, in order to improve the adaptability of the fabric channel to fabrics with different thicknesses, in this embodiment, design smooth panel 3 into detachable split type structure, so, only need come the smooth panel 3 of the different thickness of selection assembly according to the actual thickness of pre-installation surface fabric 4, just can realize the interval between smooth panel 3 and the purpose of adaptation different thickness surface fabric 4 that the width of surface fabric passageway can be fine promptly, that is to say, split type design's smooth panel 3 can also play the effect of being convenient for change the surface fabric of different thickness models in the same roll curtain product of preventing wind to the realization satisfies the demand of different users to the surface fabric of different thickness models as far as.

In addition, the width of the fabric channel is slightly larger than the thickness of the fabric 4, specifically, the width of the fabric channel is 0.5mm-1.5mm larger than the thickness of the fabric 4, in the actual production, the fabric 4 is generally bonded with the zipper 17 in a cloth adhesive bonding mode, namely, the fabric layer on the fabric 4 and the zipper 17 is made of different materials, the fabric 4 is used as a shading material for blocking the sunlight of the external environment, along with the change of the temperature difference in day and night alternation, the surface temperature of the fabric 4 and the cloth adhesive layer also has larger change, and because the materials of the fabric 4 and the cloth adhesive layer are different, the problem of fabric wrinkle at the bonding position is easy to occur after heating, because the smooth panel 3 is near the opening of the guide groove in the position design, the cloth adhesive layer between the fabric and the zipper is generally positioned in the fabric channel, and because the width of the fabric channel is only slightly larger than the thickness of the fabric, therefore, the fabric channel with the width slightly larger than the thickness of the fabric can also play a role in leveling the fabric wrinkles.

Preferably, referring to fig. 3, the smooth panel 3 is provided with rounded corners 7 on the side edges, and the smooth panel 3 treated by the rounded corners 7 is more beneficial to the lifting operation of the fabric 4.

Preferably, the lateral guide rail body comprises a main guide rail plate 8 and an auxiliary guide rail plate 9, a clamping groove 10 is arranged on one side of the main guide rail plate 8, a protrusion 11 is arranged on the side wall of the clamping groove 10, a clamping strip 12 matched with the clamping groove 10 is arranged on one side of the auxiliary guide rail plate 9, a groove 13 is arranged on the clamping strip 12, the protrusion 11 is matched with the groove 13, and the auxiliary guide rail plate 9 is installed on the main guide rail plate 8 through the clamping strip 12 in a matching mode, wherein the main guide rail plate 8 and the auxiliary guide rail plate 9 are made of aluminum alloy sections, the main guide rail plate 8 and the auxiliary guide rail plate 9 are integrally formed by the aluminum alloy sections, the weight is light, parts required to be installed are few, the traditional structural form that the screws are fixedly installed by the screws is adopted, the screwing force of the screws is different during installation, and the problem of low assembling precision is easy to occur, compared with the main guide rail plate 8 and the auxiliary guide rail plate 9 which are integrally formed by the aluminum alloy sections, the main guide rail plate 8 and the auxiliary guide rail The purpose is got up, and need not the screw and install fixedly, has improved the installation accuracy and the aesthetic property of this wear-resisting anti-lift rail.

Preferably, a middle partition 14 is arranged in the middle of the main guide rail plate 8, a guide groove 1 is formed by the space between the middle partition 14 and the two extension baffles 2, a zipper guide assembly 16 is arranged in the guide groove 1, the zipper guide assembly 16 is provided with a zipper slide cavity 18 for the zipper 17 to slide, the zipper 17 on the fabric 4 is arranged on the zipper slide cavity 18 in a sliding manner, an elastic sponge 19 or a rubber elastic pad or a spring (not shown in the drawing) is arranged on the side wall of the zipper guide assembly 16 close to the two extension baffles 2, in order to avoid the problem that the fabric 4 is separated from the zipper guide assembly 16 due to the deformation caused by heating or cooling, the elastic sponge 19 or the rubber elastic pad or the spring is arranged on the side wall of the zipper guide assembly 16 close to the two extension baffles 2, so that an elastically resettable deformation space can be arranged between the zipper guide assembly 16 and the extension baffles 2 to prevent the zipper 17 from separating from the zipper guide assembly 16 due to the deformation, so as to improve the connection stability of the product.

Referring to fig. 4 and 2, a windproof roller shutter comprises a fabric 4 provided with zippers 17 or pulling beads on both sides, a top cover 20, a roller tube 21 rotatably installed in the top cover 20, and a tubular motor 22 driving the roller tube 21 to rotate, wherein the top of the fabric 4 is wound on the roller tube 21, the two sides of the top cover 20 are provided with wear-resistant anti-lifting rails, and the zippers 17 or pulling beads are slidably arranged in a zipper sliding cavity 18, wherein a base of the tubular motor 22 is installed in the top cover 20, a driving tube of the tubular motor 22 is inserted into an inner cavity of the roller tube 21, and the tubular motor 22 drives the roller tube 21 to rotate, so that the roller tube 21 can realize the purpose of rolling up or rolling down the fabric 4.

Preferably, still include counterweight beam 23, surface fabric 4 bottom fixed mounting is on counterweight beam 23, all be equipped with on main guideway board 8 and the auxiliary guideway board 9 and extend curb plate 24, two spaces that extend between the curb plate 24 form counterweight beam spout 25, counterweight beam 23's tip sets up on counterweight beam spout 25, counterweight beam spout 25 is used for spacing direction counterweight beam 23, be equipped with anticollision strip 26 on counterweight beam spout 25's the lateral wall, because counterweight beam 23 weight is great, when surface fabric 4 receives great wind-force to blow, counterweight beam 23 takes place the problem of striking counterweight beam spout 25 lateral wall easily, therefore design anticollision strip 26 on counterweight beam spout 25's lateral wall, play the effect of slowing down counterweight beam 23 to the crashproof effect of anti lifting rail's of wear-resisting impact force.

The beneficial effects of this embodiment: the smooth panel that all designs the material to be PVC on the free end through extending baffle two, in order to reduce the coefficient of friction between smooth panel and the surface fabric, in order to realize the purpose that delays the surface fabric wearing and tearing, and then realize improving surface fabric life's purpose, can also play the effect of hiding the zip fastener direction subassembly, adopt aluminum alloy integrated into one piece's main guide rail board and auxiliary guide rail board, the quality is light, the main guide rail board and the auxiliary guide rail board of split type design, only need can realize the purpose of aggregate erection through mutually supporting of draw-in groove and card strip, need not to adopt external assembly spare to carry out supplementary installation operation like the screw, it is very convenient to install, and the installation accuracy is high, the aesthetic property of this wear-resisting anti lifting rail has also been improved simultaneously.

Example 2

In addition, to smooth panel 3 and extension baffle 2 relation of connection, except that can adopt split type relation of connection, see fig. 5, can also adopt the structure of integrated into one piece formula, two free ends that extend baffle 2 all extend smooth panel 3 to the inside or the outside of guide way 1 promptly, because the structure of extension baffle 2 among the prior art with the contact of surface fabric 4 is the end wall of the free end of extension baffle 2, the thickness of end wall is less, difficult surface treatment carries out, consequently, extend the smooth panel 3 of integral type at the free end of extension baffle 2, enlarge the end wall of free end in other words, thereby play the effect of being convenient for carry out surface treatment, so that the coefficient of friction of smooth panel 3 is less than the coefficient of friction of free end, and then realize delaying the purpose of surface fabric 4 wearing and tearing.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second", "element i", "element ii" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features indicated. Thus, features defined as "first", "second", "element i", "element ii" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" or "a plurality" means two or more unless specifically limited otherwise.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a wear-resisting anti rail of lifting, includes the side direction guide body, be equipped with the guide way on the side direction guide body, all be equipped with the relative extension baffle that sets up of free end on the two inside walls of guide way notch department, its characterized in that, two all be equipped with on the free end of extending the baffle and extend to the inside or the outside smooth panel of guide way, two clearance between the smooth panel forms the surface fabric passageway that is used for the surface fabric to pass through.

2. A wear-resistant anti-lifting rail according to claim 1, wherein the free ends of the two extending baffles are provided with hook grooves, and the two smooth panels are provided with barbs matching with the hook grooves, and the smooth panels are installed on the hook grooves through the barbs.

3. A wear-resistant anti-lifting rail according to claim 2, wherein the distance between two of said smooth panels is less than the distance between the free ends of two of said extending baffles, and the distance between two of said smooth panels is greater than the thickness of the facing material.

4. A wear and tear resistant lift rail according to any of claims 1 to 3 wherein said smooth facing is PVC.

5. A wear and tear resistant lift rail according to claim 4 wherein said smooth panel is rounded on the sides.

6. The abrasion-resistant and lift-resistant rail according to claim 1, wherein the lateral guide rail body comprises a main guide rail plate and an auxiliary guide rail plate, a clamping groove is formed in one side of the main guide rail plate, a protrusion is formed on a side wall of the clamping groove, a clamping strip matched with the clamping groove is formed in one side of the auxiliary guide rail plate, a groove is formed in the clamping strip, the protrusion is matched with the groove, and the auxiliary guide rail plate is installed on the main guide rail plate through the clamping strip in a matching mode.

7. A wear-resistant anti-lifting rail according to claim 6, wherein a middle partition plate is arranged in the middle of the main rail plate, the middle partition plate and the space between the two extension baffle plates form the guide groove, a zipper guide assembly is arranged in the guide groove, the zipper guide assembly is provided with a zipper slide cavity for sliding a zipper, the zipper on the fabric is arranged on the zipper slide cavity in a sliding manner, and the side wall of the zipper guide assembly, which is close to the two extension baffle plates, is provided with elastic sponge or rubber elastic pads or springs.

8. The abrasion-resistant and lift-resistant rail according to claim 7, wherein the main rail plate and the auxiliary rail plate are both made of aluminum alloy sections.

9. A windproof rolling curtain comprises a fabric with zippers or pull beads arranged on two side edges, and is characterized by further comprising a top cover, a roller pipe rotatably arranged in the top cover and a tubular motor for driving the roller pipe to rotate, wherein the top of the fabric is wound on the roller pipe, the two side ends of the top cover are respectively provided with the wear-resistant anti-lifting rail according to any one of claims 7 to 8, and the zippers or the pull beads are slidably arranged in a zipper sliding cavity.

10. The windproof roller shutter according to claim 9, further comprising a counterweight beam, wherein the bottom of the fabric is fixedly mounted on the counterweight beam, the main guide rail plate and the auxiliary guide rail plate are both provided with extension side plates, a space between the two extension side plates forms a counterweight beam chute, and the side wall of the counterweight beam chute is provided with an anti-collision strip.