CN218882105U - Double-chain backrush screen door - Google Patents

Abstract

The utility model discloses a double-chain rewinding screen door, comprising: a column, the column is provided with a first cavity opening to the right, and a reel is rotatably connected in the first cavity; a chain group, It includes a first chain and a second chain arranged up and down, the left end of the first chain and the left end of the second chain are respectively connected with the upper end and the lower end of the column; cavity, the right end of the first chain and the right end of the second chain respectively penetrate the upper end and the lower end of the second cavity, and the upper end and the lower end of the second cavity are rotatably connected with a fixed pulley, and the upper and lower two A connecting rope is wound between the two fixed pulleys, the first chain and the second chain are respectively arranged on the left and right sides of the connecting rope and are connected with the connecting rope, the first chain and the second The setting of the chain is conducive to improving the safety of pedestrians entering and exiting.

Description

A double-chain rewinding screen door

technical field

The utility model relates to the technical field of doors and windows, in particular to a double chain rewinding screen door.

Background technique

The screen door is a fine mesh structure installed at the entrance and exit of the home to prevent mosquitoes from entering the room without affecting ventilation. Among them, the invisible rollback screen door is widely used in the portal system of residential buildings and various catering services.

Partially concealed rewinding screen door Considering that the setting of the lower frame is easy to cause inconvenience for users to enter and exit, or even fall, which affects the travel safety of the user, the lower end of the screen door will be connected by a tank chain, so as to avoid the impact of the lower frame on the user. Obstacles caused by entry and exit, but only setting tank chains on the lower side of the screen door will easily cause uneven force on the upper and lower sides of the screen door, and it will easily cause the problem of instability of the screen door during the reciprocating pull of the screen door.

Utility model content

The utility model aims at at least solving one of the technical problems existing in the prior art.

The utility model provides a double-chain rewinding screen door, which includes a column, and a first cavity with an opening facing to the right is arranged in the column, and a reel is rotatably connected in the first cavity; the chain group includes a vertical arrangement. The first chain and the second chain, the left end of the first chain and the left end of the second chain are respectively connected with the upper end and the lower end of the column; the pull rod is provided with a second cavity, the right end of the first chain and the second chain The right end penetrates into the upper end and the lower end of the second cavity respectively, and the upper end and the lower end of the second cavity are rotatably connected with fixed pulleys, and a connecting rope is wound between the upper and lower fixed pulleys, and the first chain and the second chain are respectively arranged on The left and right sides of the connecting rope are both connected with the connecting rope; the gauze, the left end of the gauze passes through the opening of the first cavity and is wound on the reel, and the right end of the gauze is connected with the pull rod.

According to the double-chain rewinding screen door provided by the embodiment of the present invention, it has at least the following beneficial effects: the left and right sides of the double-chain rewinding screen door are respectively provided with a column and a pull rod, and the left end and the right end of the first chain They are respectively connected to the column and the pull rod, and the left end and the right end of the second chain are respectively connected to the column and the pull rod. When the user pulls the pull rod left and right, the first chain and the second chain expand and contract relative to the pull rod. Under the connection effect of the connecting rope, it can ensure The synchronous expansion and contraction of the first chain and the second chain is conducive to improving the stability of the opening and closing of the double-chain rewinding screen door. The left end of the gauze passes through the opening of the first cavity and is wound on the reel. The right end is connected with the pull rod. As the pull rod moves to the right or left, the gauze can expand or contract relative to the reel, thereby preventing mosquitoes from entering the room and opening the walkway. The double-chain rewinding screen door passes through the first The setting of the chain and the second chain replaces the slide rails set on the upper and lower sides of the traditional rewinding screen door. When the double chain rewinding screen door is opened, most of the first chain and the second chain shrink inside the pull rod, which is beneficial to avoid the traditional The lower frame of the screen door hinders pedestrians from entering and exiting, which is conducive to improving the safety of pedestrians entering and exiting, and the first chain and the second chain can be accommodated inside the pull rod when not in use, thereby avoiding the lower frame of the traditional screen door from easily collecting dust , Difficult to clean problems.

According to some embodiments of the present invention, the first chain is thinner than the second chain.

Considering that the first chain exerts pressure on the gauze, while the pressure of the second chain can directly act on the ground, the first chain of the double-chain rewinding sand door is thinner than the second chain, which is beneficial to reduce the deformation of the upper side of the gauze due to pressure However, the second chain is thicker, which is beneficial to increase the contact area between the second chain and the ground, and improve the stability and windproof performance of the movement of the double-chain rewinding screen door.

According to some embodiments of the present utility model, the second cavity is provided with a first sub-cavity and a second sub-cavity arranged left and right, the width of the first sub-cavity is smaller than that of the second sub-cavity, and the right end of the first chain can penetrate into the In the first sub-cavity, the right end of the second chain can pass through the second sub-cavity.

The second cavity is provided with a first sub-cavity and a second sub-cavity arranged left and right. With the expansion and contraction of the pull rod, the right end of the first chain can be stretched relative to the first sub-cavity, and the right end of the second chain can be stretched relative to the second sub-cavity. The cavity is stretchable, and the width of the first sub-cavity is smaller than the second sub-cavity, so that the size of the first sub-cavity is adapted to the first chain, and the size of the second sub-cavity is adapted to the second chain, that is, the first chain The left and right staggered arrangement with the second chain is beneficial to avoid the problem that the first chain and the second chain interfere with each other and affect the stretching stroke of the first chain and the second chain.

According to some embodiments of the present invention, the right end of the gauze is detachably connected to the pull rod.

The right end of the gauze is detachably connected to the pull rod, which can meet the requirements for the gauze to be assembled and disassembled with the pull rod. When the gauze and the pull rod are disassembled, it is easy to clean the gauze.

According to some embodiments of the present utility model, the utility model also includes a plug-in rod, the right end of the gauze is connected to the plug-in rod, and the pull rod includes a first sub-block, a rod body and a second sub-block connected sequentially from top to bottom, and the rod body The left side of the first sub-block is provided with a through slot, the left side of the first sub-block is provided with a first card slot with the opening facing downward, and the left side of the second sub-block is provided with a second card slot with the opening facing upward. The through slot is arranged, and the upper end and the lower end of the inserting rod are engaged with the first card slot and the second card slot respectively.

Specifically, the right end of the gauze net is connected with the inserting rod, and the inserting rod can be set through the through slot, and the upper end and the lower end of the inserting rod are respectively engaged with the first clamping slot and the second clamping slot, so that the yarn can be realized. The connection between the net and the pull rod, along with the movement of the pull rod in the left and right direction, can realize the closing and opening of the gauze to the door frame, meeting the use requirements of the screen door, and through the first sub-block, the rod body and the second sub-block The installation and disassembly can realize the connection and disassembly of the inserting rod and the pull rod, and the assembly and disassembly are relatively convenient and simple.

According to some embodiments of the present invention, rollers are connected to the upper end of the first sub-block and the lower end of the second sub-block.

The upper end of the first sub-block and the lower end of the second sub-block are connected with rollers. By setting the rollers, the upper end of the pull rod can be connected with the upper frame of the door frame, so that the lower end of the pull rod is connected with the lower frame of the door frame or the ground. It is beneficial to improve the sliding smoothness of the double-chain rewinding screen door, to reduce the noise generated when the double-chain rewinding screen door is moving, and to reduce the movement of the first chain and the second chain. Risk of scratching door frames or floors.

According to some embodiments of the present invention, the present invention further includes a rotating shaft and a spring, the rotating shaft is arranged in the reel and coaxially arranged with the reel, and the spring is arranged between the rotating shaft and the reel and connected with the reel.

The rotating shaft is set in the reel and coaxial with the reel, the setting of the rotating shaft is beneficial to avoid the problem of the eccentricity of the reel, and the spring is arranged between the rotating shaft and the reel and connected with the reel, so that the spring provides the rotation of the reel Torque, in the natural state, can make the gauze shrink automatically, that is, the pull rod can automatically approach the column, which is conducive to simplifying the user's operation, and does not require the user to frequently move the pull rod, thereby improving the user's ability to use the double-chain rewinding screen door comfort.

According to some embodiments of the present invention, the present invention further includes a door frame, and magnetic strips are provided on the sides where the door frame and the pull rod are close to each other.

There is a magnetic strip on the side where the door frame and the pull rod are close to each other. When the pull rod moves to the right and fits to the door frame, under the magnetic force of the magnetic strip, the pull rod automatically realizes the locking with the pull rod. Under the action of the gauze, The function of preventing mosquitoes from entering the room is realized, and the magnetic strip adsorption mode is conducive to simplifying the operation process of the double-chain rewinding screen door, thereby improving the user's comfort in use.

According to some embodiments of the present invention, both the first chain and the second chain are detachably connected to the connecting rope.

Both the first chain and the second chain are detachably connected to the connecting rope, so that it is convenient for workers to adjust the relative positional relationship between the first chain and the second chain and the connecting rope, so as to ensure that the first chain and the second chain have the same telescopic length relative to the pull rod , that is to maintain the synchronization rate of the first chain and the second chain, thereby improving the sliding smoothness of the double-chain rewinding screen door.

According to some embodiments of the present invention, both ends of the connecting rope are detachably connected to the right end of the first chain.

Both ends of the connecting rope are detachably connected to the right end of the first chain, so that the connecting rope forms a ring, and the connecting rope is wound around the upper and lower fixed pulleys. When the connecting rope rotates forward or reverse, it can drive The first chain and the second chain are close to or far away from each other, so as to realize the expansion and contraction of the first chain and the second chain relative to the pull rod, and meet the use requirement of the double-chain rewinding screen door movement.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a structural schematic diagram of a double chain rewinding screen door provided by the embodiment of the present invention;

Fig. 2 is a cross-sectional structural view of a double chain rewinding screen door shown in Fig. 1;

Fig. 3 is an exploded view of a double chain rewinding screen door provided by the embodiment of the present invention;

Fig. 4 is a structural schematic diagram of the connection between the first chain and the second chain and the connecting rope of a double-chain rewinding screen door provided by the embodiment of the present invention;

Fig. 5 is a structural schematic diagram of the connection between the first chain and the second chain of a double-chain rewinding screen door provided by an embodiment of the present invention;

Fig. 6 is a structural schematic diagram of the cross section of the first chain and the second chain of a double chain rewinding screen door provided by the embodiment of the present invention;

Fig. 7 is a structural schematic diagram of a cross-section of a pull rod of a double chain rewinding screen door provided by an embodiment of the present invention;

Fig. 8 is a structural schematic diagram of a pull rod of a double chain rewinding screen door provided by an embodiment of the present invention;

Fig. 9 is an assembly diagram of a pull rod of a double chain rewinding screen door provided by the embodiment of the present invention;

Fig. 10 is a structural schematic diagram of the right end of the first chain and the right end of the second chain of a double-chain rewinding screen door provided by an embodiment of the present utility model.

In the accompanying drawings: 100, column; 210, reel; 220, rotating shaft; 230, spring; 310, the first chain; 311, the first sliding seat; 320, the second chain; 321, the second sliding seat; 400, pull bar 410, the second cavity; 411, the first sub-cavity; 412, the second sub-cavity; 420, the fixed pulley; 430, the first sub-block; 440, the rod body; 441, the through groove; 450, the second sub-block; 451, the second card slot; 500, the connecting rope; 600, the gauze; 700, the insertion rod; 800, the magnetic strip.

Detailed ways

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that when it comes to orientation descriptions, for example, the orientations or positional relationships indicated by up, down, front, back, left, right, etc. are based on the orientations or positional relationships shown in the accompanying drawings, only It is for the convenience of describing the utility model and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model.

In the description of the present utility model, the meaning of several is indeterminate, and the meaning of multiple is more than two. Greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features relation. In addition, and/or appearing in the whole text means three parallel schemes, for example, A and/or B means a scheme satisfied by A, a scheme satisfied by B, or a scheme satisfied by A and B simultaneously.

In the description of the present utility model, if there is a short sentence containing multiple parallel features, the attributive wherein defines the closest feature, for example: B, C, and E connected to D on A are arranged on A, represented What is meant is that B is set on A, and E is connected to D, which does not constitute a limitation on C; but the attributives expressing the relationship between features, such as "interval setting", "circular arrangement", etc., do not belong to this category. With the word "all" before the attributive, it means that it is the limitation of all features in the short sentence, such as B, C, and D that are all set on A, then it means that B, C, and D are all set on A.

In the description of the utility model, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above-mentioned words in the utility model in combination with the specific content of the technical solution .

Below in conjunction with Fig. 1-Fig. 10, the embodiment of the utility model is described.

Embodiment 1, referring to FIG. 1 and FIG. 3 , the embodiment of the present invention provides a double-chain rewinding screen door, including: a column 100 , a chain set, a pull rod 400 and a gauze 600 .

The double-chain rewinding screen door can be installed to the user's ready-made door frame, so as to match the existing door frame, and under the unfolding or folding of the gauze 600, the door frame can be closed to prevent mosquitoes from entering the room and open the passage for pedestrians to enter and exit role.

The upright post 100 and the pull rod 400 are both extended up and down and parallel to each other. The upright post 100 is arranged on the left side of the door frame and connected with the door frame. The column 100 is provided with a first cavity with an opening facing to the right. The first cavity is provided with a reel 210, a rotating shaft 220 and a spring 230. The reel 210 and the rotating shaft 220 are arranged coaxially. The outer periphery of the shaft is rotatably connected with the column 100 , and the spring 230 is arranged between the reel shaft and the rotating shaft 220 , and the spring 230 is elastically connected with the reel 210 and the reel 210 .

Referring to FIG. 2 , the left end of the gauze 600 passes through the opening of the first cavity and is wound on the reel 210 , and the right end of the gauze 600 is detachably connected to the tie rod 400 . The setting of the rotating shaft 220 is beneficial to avoid the problem of the eccentricity of the reel, and the spring 230 is arranged between the rotating shaft 220 and the reel 210 and is connected with the reel 210, so as to provide torque to the rotation of the reel 210. In the natural state, it can make The gauze 600 shrinks automatically, that is, the pull rod 400 can automatically approach the column 100, which is beneficial to simplify the user's operation, and does not require the user to frequently move the pull rod 400, thereby improving the user's comfort when using the double chain rewinding screen door.

Referring to Fig. 6, the chain group includes a first chain 310 and a second chain 320 arranged up and down. When the screen door closes the door frame, the first chain 310 and the second chain 320 extend left and right. The left end of the first chain 310 and the The left end of the second chain 320 is respectively connected with the upper end and the lower end of the column 100, when the column 100 is fixed relative to the door frame, the left ends of the first chain 310 and the second chain 320 are fixed relative to the door frame.

Considering that the first chain 310 has pressure on the gauze 600, and the pressure of the second chain 320 can directly act on the ground, the first chain 310 of the double-chain rewinding sand door is thinner than the second chain 320, which is beneficial to reduce the gauze. The upper side of 600 is deformed under pressure, and the second chain 320 is thicker, which is beneficial to increase the contact area of the second chain 320 to the ground, and improve the stability and windproof performance of the movement of the double-chain rewinding screen door.

Referring to FIG. 7 , in order to avoid the problem that the upper and lower tank chains are arranged opposite to each other and cause the two tank chains to obstruct each other, the telescopic stroke of the tank chain can only reach half the length of the pull rod 400 . The pull rod 400 of the double-chain rewinding screen door is provided with a second cavity 410, and the right end of the first chain 310 and the right end of the second chain 320 penetrate into the upper end and the lower end of the second cavity 410 respectively, so that the first chain 310 and the second chain 320 are arranged in a staggered left and right direction, which is beneficial to avoid the problem that the first chain 310 and the second chain 320 interfere with each other, which will affect the stretching stroke of the first chain 310 and the second chain 320 .

And the width of the first subcavity 411 is smaller than the second subcavity 412, so that the size of the first subcavity 411 is adapted to the first chain 310, and the size of the second subcavity 412 is adapted to the second chain 320, that is, The first chain 310 and the second chain 320 are alternately arranged left and right.

The upper end and the lower end of the second cavity 410 are rotatably connected with a fixed pulley 420, and a connecting rope 500 is wound between the upper and lower fixed pulleys 420. The first chain 310 and the second chain 320 are respectively arranged on the left and right sides of the connecting rope 500. And all are connected with the connecting rope 500; under the connecting action of the connecting rope 500, the synchronous expansion and contraction of the first chain 310 and the second chain 320 can be ensured, which is beneficial to improve the stability of opening and closing of the double-chain rewinding screen door.

Referring to Fig. 4 and Fig. 5, when the user pulls the pull rod 400 left and right, the first chain 310 and the second chain 320 expand and contract relative to the pull rod 400. , can drive the first chain 310 and the second chain 320 to approach or move away from each other, so as to realize the expansion and contraction of the first chain 310 and the second chain 320 relative to the pull rod 400, and meet the use requirements of the double-chain rewinding screen door movement.

The double-chain rewinding screen door replaces the slide rails arranged on the upper and lower sides of the traditional rewinding screen door through the setting of the first chain 310 and the second chain 320. When the double-chain rewinding screen door is opened, the first chain 310 and the second chain Most of the second chain 320 is shrunk inside the pull rod 400, which is beneficial to avoid the obstruction caused by the lower frame of the traditional screen door to pedestrians, and is conducive to improving the safety of pedestrians. When the first chain 310 and the second chain 320 are not in use, It can be accommodated inside the pull rod 400, so as to avoid the problem that the lower frame of the traditional screen door is easy to store dust and difficult to clean.

The right end of the gauze 600 is detachably connected to the pull rod 400, which can meet the requirements for the gauze 600 to be assembled and disassembled with the pull rod 400. When the gauze 600 and the pull rod 400 are disassembled, the gauze 600 can be cleaned.

Referring to Fig. 3, Fig. 8 and Fig. 9, specifically, the tie rod 400 includes a first sub-block 430, a rod body 440 and a second sub-block 450 sequentially connected from top to bottom, and the first sub-block 430, the rod body 440 and the second The sub-block 450 can be detachably connected by means of threaded connection and card connection. The double-chain rewinding screen door also includes a plugging rod 700, the right end of the gauze 600 is connected with the plugging rod 700, such as the right side of the gauze 600 is sleeved on the plugging rod 700, and the right end of the gauze 600 is glued to the plugging rod 700. Connect on the inserting rod 700.

The left side of the rod body 440 is provided with a through groove 441, the left side of the first sub-block 430 is provided with a first card slot with the opening facing downward, and the left side of the second sub-block 450 is provided with a second card slot with the opening facing upward. Slot 451, the insertion rod 700 is set through the through groove 441, the upper end and the lower end of the insertion rod 700 are respectively engaged with the first slot and the second slot 451, so that the connection between the gauze 600 and the pull rod 400 can be realized. The movement of the pull rod 400 in the left and right direction can realize the closing and opening of the door frame by the gauze 600 to meet the use requirements of the screen door, and through the installation and After disassembly, the connection between the inserting rod 700 and the upper end of the first sub-block 430 and the lower end of the second sub-block 450 can be realized.

The upper end of the first sub-block 430 and the lower end of the second sub-block 450 are all connected with rollers. By setting the rollers, the upper end of the pull rod 400 can be connected with the upper frame of the door frame, so that the lower end of the pull rod 400 can be connected with the lower frame of the door frame or the ground. , the arrangement of the rollers is beneficial to improve the sliding smoothness of the double-chain rewinding screen door, helps to reduce the noise generated when the double-chain rewinding screen door moves, and is beneficial to reduce the first chain 310 and the second chain. 320 During the movement, the risk of scratching the door frame or the ground.

A magnetic strip 800 is provided on the side where the door frame and the pull rod 400 are close to each other. When the pull rod 400 moves to the right and fits to the door frame, under the magnetic force of the magnetic strip 800, the pull rod 400 automatically realizes locking with the pull rod 400. Under the action of the gauze 600, the function of preventing mosquitoes from entering the room is realized, and the adsorption mode of the magnetic strip 800 is conducive to simplifying the operation process of the double-chain rewinding screen door, thereby improving the comfort of the user. In some other embodiments of the present utility model, the pull rod 400 can be connected to the door frame through a mortise lock and a lock body.

Both the first chain 310 and the second chain 320 are detachably connected to the connecting rope 500. Specifically, a first sliding seat 311 is provided at the right end of the first chain 310, and a screw hole is provided on the first sliding seat 311. The user will The screw is screwed into the screw hole and the left side of the connecting rope 500 can be wound between the screw and the first sliding seat 311. As the screw is continuously tightened, the screw can be abutted against the connecting rope 500, thereby realizing the first sliding seat 311. The connection between a sliding seat 311 and the connecting rope 500 satisfies the requirement of detachable connection between the first chain 310 and the connecting rope 500 .

The right end of the second chain 320 is provided with a second sliding seat 321, and the second sliding seat 321 is provided with a screw hole, and the user threads the screw to the screw hole and can wind the right side of the connecting rope 500 between the screw and the first screw. Between the two sliding seats 321, as the screw is continuously tightened, the screw can abut against the connecting rope 500, thereby realizing the connection between the second sliding seat 321 and the connecting rope 500, satisfying that the second chain 320 and the connecting rope 500 can Use requirements for disconnection.

Referring to Fig. 4, Fig. 5 and Fig. 10, specifically, the pressing piece is elastically connected to the second sliding seat 321, a first distance is set between the pressing piece and the second sliding seat 321, and the right side of the connecting rope 500 is sandwiched between Between the pressing piece and the second sliding seat 321, and as the screw threaded with the second sliding seat 321 is screwed in, the screw can abut against the pressing piece, so that the connecting rope 500 is compressed between the pressing piece and the second sliding seat 321. Between the sliding seats 321, the connection between the second sliding seat 321 and the connecting rope 500 can be realized. When the screw connected to the second sliding seat 321 is loosened, the user can conveniently adjust the position where the connecting rope 500 is stuck between the pressing piece and the second sliding seat 321, thereby adjusting the first chain 310 and the second chain. The effect of the relative positional relationship between the 320 and the connecting rope 500 is beneficial to keep the stretching strokes of the first chain 310 and the second chain 320 relative to the pull rod 400 the same.

The second sliding seat 321 is also connected with a counterweight. When the second sliding seat 321 is connected to the connecting rope 500, the setting of the counterweight can make the connecting rope 500 in a straightened state, which is beneficial to keep the connecting rope 500 and the fixed pulley. 420 , under the connection effect of the connecting rope 500 , the synchronization and linkage between the first chain 310 and the second chain 320 can be realized.

Both ends of the connecting rope 500 are detachably connected to the first sliding seat 311 of the first chain 310, so that the connecting rope 500 forms a ring, and the connecting rope 500 is wound around the upper and lower two fixed pulleys 420. When rotating forward or reverse, it can drive the first chain 310 and the second chain 320 to approach or move away from each other, so as to realize the expansion and contraction of the first chain 310 and the second chain 320 relative to the pull rod 400, satisfying the movement of the double-chain rewinding screen door. usage requirements.

The preferred embodiments of the present utility model have been specifically described above, but the present invention is not limited to the examples, and those skilled in the art can also make various equivalent modifications or replacements without violating the spirit of the present utility model , these equivalent modifications or replacements are all included within the scope defined by the claims of the present invention.

Claims (9)

1. A double chain rewinding screen door, characterized in that it comprises: A column (100), the column (100) is provided with a first cavity opening to the right, and a reel (210) is rotatably connected to the first cavity; A chain group, which includes a first chain (310) and a second chain (320) arranged up and down, the left end of the first chain (310) and the left end of the second chain (320) are respectively connected to the column ( 100) connected to the upper end and the lower end, the first chain (310) is thinner than the second chain (320); A pull rod (400), the pull rod (400) is provided with a second cavity (410), the right end of the first chain (310) and the right end of the second chain (320) are respectively inserted into the second The upper end and the lower end of the cavity (410), the upper end and the lower end of the second cavity (410) are rotatably connected with a fixed pulley (420), and a connecting rope ( 500), the first chain (310) and the second chain (320) are respectively arranged on the left and right sides of the connecting rope (500) and are connected to the connecting rope (500); A gauze (600), the left end of the gauze (600) passes through the opening of the first cavity and is wound on the reel (210), the right end of the gauze (600) is connected to the Pull rod (400) is connected. 2. The double chain rewinding screen door according to claim 1, characterized in that, the second cavity (410) is provided with a first sub-cavity (411) and a second sub-cavity (412) arranged left and right ), the width of the first subcavity (411) is smaller than that of the second subcavity (412), the right end of the first chain (310) can penetrate into the first subcavity (411), the The right end of the second chain (320) can pass into the second subcavity (412). 3. The double chain rewinding screen door according to claim 1, characterized in that, the right end of the gauze (600) is detachably connected to the pull rod (400). 4. The double-chain rewinding screen door according to claim 3, characterized in that it further comprises a plug-in rod (700), the right end of the gauze (600) is connected to the plug-in rod (700), the The pull rod (400) includes a first sub-block (430), a rod body (440) and a second sub-block (450) connected sequentially from top to bottom, and the left side of the rod body (440) is provided with a through groove (441 ), the left side of the first sub-block (430) is provided with a first slot with the opening facing downward, and the left side of the second sub-block (450) is provided with a second slot with the opening facing upward ( 451), the insertion rod (700) is set through the through groove (441), and the upper end and the lower end of the insertion rod (700) are respectively connected with the first slot and the second slot ( 451) card connection. 5. The double chain rewinding screen door according to claim 4, characterized in that rollers are connected to the upper end of the first sub-block (430) and the lower end of the second sub-block (450). 6. The double chain rewinding screen door according to claim 1, characterized in that it further comprises a rotating shaft (220) and a spring (230), the rotating shaft (220) is arranged in the drum (210) and is connected with The reel (210) is arranged coaxially, and the spring (230) is arranged between the rotating shaft (220) and the reel (210) and connected with the reel (210). 7 . The double chain rewinding screen door according to claim 6 , further comprising a door frame, and a magnetic strip ( 800 ) is provided on a side where the door frame and the pull rod ( 400 ) are close to each other. 7 . 8. The double chain rewinding screen door according to claim 1, characterized in that, both the first chain (310) and the second chain (320) are detachably connected to the connecting rope (500). 9. The double-chain rewinding screen door according to claim 8, characterized in that, both ends of the connecting rope (500) are detachably connected to the right end of the first chain (310).

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