Double-layer shading spring roller blind

Abstract

The present invention belongs to the field of spring roller blinds, and specifically relates to a double-layer light-blocking spring roller blind, comprising a light-transmitting cloth, on which a plurality of light-shielding portions are arranged side by side and equidistantly distributed, the light-transmitting cloth is distributed in a "U" shape, one end of the top thereof is wound around a drum, and the other end of the top thereof is detachably connected to a fixed rod, and a winding mechanism comprises a spring roller which is detachably connected to the end of the fixed rod, and the end of the drum is connected to the output shaft of the spring roller, and the spring roller is used for rotating the drum, thereby raising and lowering the light-transmitting cloth, and can stay at any height, which is convenient for adjusting the amount of light transmitted, and the spring roller is used for providing a winding force, so that the drum rotates to retract the light-transmitting cloth onto the drum, and under the action of the deadweight of the lower pull rod, the light-transmitting cloth remains stationary, and when the lower pull rod is lifted upward, the spring roller rolls up the light-transmitting cloth, and when the lower pull rod is released, the light-transmitting cloth stops, thereby realizing the function of staying at any height.

Description

Technical Field

[0001] The invention belongs to the field of spring roller blinds, and in particular relates to a double-layer light-shielding spring roller blind. Background Art

[0002] Spring roller shutters, named after the built-in spring device in the tube, are also called semi-automatic roller shutters. According to different operating systems, they can be divided into traditional pull-cord spring roller shutters, pull-bead spring roller shutters, one-control two-type spring roller shutters, and power-assisted spring roller shutters.

[0003] The spring roller blinds in the prior art are usually arranged for shading. When the roller blinds are in the highest position, sunlight enters the house from the window. When the roller blinds are in the lowest position, the sunlight is blocked. If only part of the sunlight is needed to pass through the window, the roller blinds need to be raised to halfway. However, at this time, the sunlight passes through the bottom of the roller blinds, so the sunlight in the house is close to the ground. Therefore, it is not convenient to adjust the amount of light transmission, especially when the intensity of the external sunlight is high and the user wants to let in part of the sunlight to evenly fill the house. The prior art cannot meet this usage scenario well. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-layer shading spring roller blind to solve the problems in the prior art. The technical solution adopted by the present invention is:

[0005] A double-layer light-blocking spring roller blind comprises a light-transmitting cloth, on which a plurality of light-blocking portions are arranged side by side and equidistantly. The light-transmitting cloth is arranged in a U-shape, with one end of the top wound around a drum and the other end of the top detachably connected to a fixed rod. The bottom of the light-transmitting cloth is rotatably mounted on a lower pull-down rod, and a winding mechanism is provided at both ends of the fixed rod. The winding mechanism comprises a spring roller detachably connected to the end of the fixed rod, and the end of the drum is connected to the output shaft of the spring roller. The spring roller is used to rotate the drum, thereby raising and lowering the light-transmitting cloth and allowing it to stay at any height.

[0006] Furthermore, the winding mechanism also includes a limiting cylinder inserted into the end of the reel, and the end of the limiting cylinder away from the reel is detachably connected to an adjusting ring, and the limiting cylinder is connected to the output shaft.

[0007] Furthermore, the outer circumference of the limiting cylinder is provided with a plurality of limiting protrusions, the inner circumference of the reel is provided with a plurality of inner protrusions, the gaps between two adjacent inner protrusions are distributed and form a card slot, and the limiting protrusions are inserted into the card slot one by one.

[0008] Furthermore, the winding mechanism also includes a connecting sleeve arranged on the output shaft, the connecting sleeve passes through the adjusting ring and is located in the limiting cylinder, one side end face of the adjusting ring is fixedly connected to the arc plate adapted to the limiting cylinder, the arc plate is inserted in the limiting cylinder, the inner circumference of the limiting cylinder is fixedly connected to two blocks, the two ends of the arc plate respectively abut the blocks, the outer circumference of the connecting sleeve is fixedly connected to the fixed block, and the fixed block is located between the two ends of the arc plate.

[0009] Furthermore, the connecting sleeve is located in the limiting cylinder at one end and is fixedly connected to the elastic sheet, and a wedge-shaped portion is provided at the end of the elastic sheet away from the connecting sleeve. A clamping ring is fixedly connected in the limiting cylinder, and the wedge-shaped portion of the elastic sheet passes through the clamping ring and is clamped on the end face of the clamping ring. The connecting sleeve is a stepped shaft structure, and a stepped portion adapted to the connecting sleeve is provided on the side of the adjusting ring away from the elastic sheet.

[0010] Furthermore, the inner circumference of the connecting sleeve is in the form of an inner hexagonal hole, and the circumference of the output shaft is in the form of a matching outer hexagonal structure.

[0011] Furthermore, grooves are provided on both sides of the fixing rod, the opening direction of the groove is horizontal, the top inner wall of the groove is fixedly connected to the clip strip, and a gap is set between the bottom of the clip strip and the bottom inner wall of the groove, one end of the translucent roll cloth is inserted into the groove from under the clip strip and is connected to a limiting strip, and the width of the limiting strip is greater than the gap under the clip strip.

[0012] Furthermore, the fixing rod is a hollow structure, the side of the spring roller is fixedly connected to the plug-in block, and the plug-in block is inserted into the end opening of the fixing rod;

[0013] A coil spring is provided in the spring curtain roller, one end of the coil spring is connected to a rotating shaft, the rotating shaft is rotatably connected to the spring curtain roller, and the rotating shaft is fixedly connected to the output shaft.

[0014] Furthermore, the lower pull rod is provided with an opening portion facing upward, a fixed shaft is provided in the opening portion, both ends of the fixed shaft are detachably connected to fixing plates, the fixing plates are detachably connected to the ends of the lower pull rod, and the bottom of the translucent roll cloth is sleeved under the fixed shaft.

[0015] Furthermore, the cross-section of the lower pull rod is a "U"-shaped structure, and a horizontal plate is fixedly connected in its opening. The fixed shaft is located above the horizontal plate, and two support blocks are fixedly connected below the horizontal plate and on the inner wall of the bottom of the lower pull rod. Two plug-in plates are fixedly connected to the side of the fixed plate. The two plug-in plates are inserted into the opening of the lower pull rod and are respectively located between the horizontal plate and the support blocks. The fixed shaft is a hollow structure, and the fixed plate is fixedly connected to the plug-in rod inserted into the fixed shaft.

[0016] The present invention has the following beneficial effects: when the lower pull-down rod is pulled, the shading parts on the front layer and the rear layer are staggered, partially staggered or overlapped horizontally. When they are staggered, sunlight cannot pass through the roller blind, and when they are overlapped, sunlight enters the room through the light-transmitting roll-up cloth. When they are partially staggered, part of the sunlight is transmitted. Compared with the prior art, the present invention adopts a two-layer structure of light-transmitting roll-up cloth and arranges shading parts equidistantly distributed side by side on the light-transmitting roll-up cloth. The staggered or overlapping distribution of the shading parts achieves the purposes of shading, light transmission and partial light transmission, and is convenient for adjusting the amount of light transmission while allowing sunlight to enter the room evenly, thereby being suitable for the use requirements of various scenes, and the spring roller blind is used to provide a winding force to rotate the drum to retract the light-transmitting roll-up cloth onto the drum. Under the action of the deadweight of the lower pull-up rod, the light-transmitting roll-up cloth remains stationary. When the lower pull-up rod is lifted upward, the spring roller blind rolls up the light-transmitting roll-up cloth. When the lower pull-up rod is released, the light-transmitting roll-up cloth stops, thereby realizing the function of staying at any height. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the front view and side view of the present invention;

[0018] Figure 2 for Figure 1 AA direction schematic diagram;

[0019] Figure 3 It is a front view and a side cross-sectional schematic diagram of a spring roller shutter;

[0020] Figure 4 Schematic diagram of the reel connection relationship;

[0021] Figure 5 Schematic diagram of the connection relationship of the winding mechanism;

[0022] Figure 6 is a schematic cross-sectional view of a lower tie rod;

[0023] Figure 7 Schematic diagram of the connection relationship of the lower pull rod. DETAILED DESCRIPTION

[0024] The following is a combination of the embodiments of the present invention Figure 1-Figure 7, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0025] like Figure 1 A double-layer light-blocking spring roller blind comprises a light-transmitting cloth 1, on which are provided a number of light-blocking portions 101 arranged side by side and equidistantly spaced. The light-transmitting cloth 1 is U-shaped, with one end of its top wound around a drum 7, and the other end of its top detachably connected to a fixed rod 3. The bottom of the light-transmitting cloth 1 is rotatably sleeved on a lower pull-down rod 5, and a winding mechanism is provided at both ends of the fixed rod 3. The winding mechanism comprises a spring roller 4 detachably connected to the end of the fixed rod 3, and the end of the drum 7 is connected to the output shaft 403 of the spring roller 4. The spring roller 4 is used to rotate the drum 7, thereby raising and lowering the light-transmitting cloth 1 and allowing it to stay at any height.

[0026] Specifically, the light-transmitting roll cloth 1 is a prior art, which is a light-transmitting roller blind fabric. The shading portion 101 can be fixed on the light-transmitting roll cloth 1 by pasting, sewing, etc. The shading portion 101 is not light-transmitting or has a small light transmittance, and can be a fabric with smaller gaps and tighter texture. The shading portion 101 forms a light-shielding area on the light-transmitting roll cloth 1, and the light-transmitting roll cloth 1 forms a light-transmitting area. The light-transmitting area and the light-shielding area are alternately arranged. The fixing rod 3 is arranged horizontally, and one end of the light-transmitting roll cloth 1 can be locked on the reel 7 by bonding or nailing. , and one end of the translucent cloth 1 is wound around the drum 7 for several turns, and the other end of the translucent cloth 1 is connected to the fixed rod 3. The spring roller 4 is used to provide a winding force to rotate the drum 7 to retract the translucent cloth 1 onto the drum 7. Under the action of the deadweight of the lower pull rod 5, the translucent cloth 1 remains stationary. When the lower pull rod 5 is lifted upward, the spring roller 4 rolls up the translucent cloth 1. When the lower pull rod 5 is released, the translucent cloth 1 stops, so that the function of staying at any height can be achieved.

[0027] When viewed from the side, the entire roller blind is arranged in a "U" shape, so that the light-transmitting cloth 1 is divided into two layers, namely the front layer and the rear layer. When the lower pull rod 5 is pulled to extend the light-transmitting cloth 1 downward, the shading portions 101 on the front layer and the rear layer are staggered or overlapped horizontally. When they are staggered, sunlight is blocked by the shading portions 101 of the front layer or the rear layer and cannot pass through the roller blind. When they are overlapped, sunlight passes through the light-transmitting cloth 1 on the front layer and the rear layer, allowing sunlight to enter the room. In addition, the purpose of transmitting part of the sunlight can be achieved by adjusting the different staggered areas of the shading portions 101, thereby achieving It is now convenient to adjust the amount of light transmittance, and at this time the length of the light-transmitting roll cloth 1 does not change much, so the sunlight can enter the house evenly, and when the sunlight is tilted, the relative position of the front layer or the rear layer can be adjusted so that the shading portion 101 corresponds to the angle of the sunlight. Compared with the prior art, the present invention adopts a two-layer structure of the light-transmitting roll cloth 1 and provides equidistant and side-by-side shading portions 101 on the light-transmitting roll cloth 1. The staggered or overlapping distribution of the shading portions 101 achieves the purposes of shading, light transmission, and partial light transmission, which facilitates the adjustment of the amount of light transmittance while allowing sunlight to enter the house evenly, thereby being suitable for the use requirements of various scenarios.

[0028] like Figure 2-Figure 5 , the specific structure of the winding mechanism is described below:

[0029] Furthermore, the winding mechanism further includes a limiting cylinder 9 inserted into the end of the reel 7 , and the end of the limiting cylinder 9 away from the reel 7 is detachably connected to the adjusting ring 2 , and the limiting cylinder 9 is connected to the output shaft 403 .

[0030] The reel 7 is a hollow structure, and the adjusting ring 2 is located on the end face thereof away from the reel 7 . The adjusting ring 2 , the reel 7 , and the limiting cylinder 9 are coaxially arranged. The transparent cloth 1 can be manually raised and lowered by rotating the adjusting ring 2 .

[0031] Furthermore, the outer circumference of the limiting cylinder 9 is provided with a plurality of limiting protrusions 901, and the inner circumference of the reel 7 is provided with a plurality of inner protrusions 701. The gaps between two adjacent inner protrusions 701 are distributed to form a card slot, and the limiting protrusions 901 are inserted into the card slot one by one.

[0032] Specifically, the card slot is distributed along the axial direction of the reel 7, and through the cooperation of the limiting protrusion 901 and the inner protrusion 701, a limiting constraint is formed on the circumference of the reel 7, so that when the limiting cylinder 9 rotates, the reel 7 is driven to rotate together, thereby transmitting the torque of the output shaft 403 to the reel 7 through the limiting cylinder 9, realizing the automatic lifting of the transparent cloth 1.

[0033] Furthermore, the winding mechanism also includes a connecting sleeve 11 sleeved on the output shaft 403, the connecting sleeve 11 passes through the adjusting ring 2 and is located in the limiting cylinder 9, one side end face of the adjusting ring 2 is fixedly connected to the arc plate 201 adapted to the limiting cylinder 9, the arc plate 201 is inserted in the limiting cylinder 9, the inner circumference of the limiting cylinder 9 is fixedly connected to two blocks 903, the two ends of the arc plate 201 respectively abut the blocks 903, the outer circumference of the connecting sleeve 11 is fixedly connected to the fixed block 112, and the fixed block 112 is located between the two ends of the arc plate 201.

[0034] The curved plate 201 is fitted on the inner circumferential surface of the limiting cylinder 9, the connecting sleeve 11 is located on the inner side of the curved plate 201, and the fixed block 112 is located in the area inside the limiting cylinder 9 that is not covered by the curved plate 201. When the output shaft 403 rotates, the connecting sleeve 11 rotates accordingly, so the circumferential fixed block 112 hits the curved plate 201, causing the curved plate 201 to rotate, and the curved plate 201 drives the adjusting ring 2 to rotate, and the curved plate 201 drives the limiting cylinder 9 to rotate through the stop block 903, so the limiting cylinder 9 finally drives the reel 7 to rotate, realizing the process of transmitting the torque of the output shaft 403 to the reel 7, and manually rotating the adjusting ring 2 can also realize the rotation of the reel 7, thereby achieving the purpose of manually lifting and lowering the light-transmitting cloth 1 through the adjusting ring 2. Therefore, the reeling of the light-transmitting cloth 1 can be achieved by lifting and lowering the pull-down rod 5 and rotating the adjusting ring 2.

[0035] In addition, the outer peripheral surface of the adjusting ring 2 is provided with a tooth portion, so that the adjusting ring 2 is in the shape of a gear ring, and its tooth portion is used to connect the pull rope in the prior art. The pull rope is an optional component, which can realize the forward and reverse rotation of the adjusting ring 2 by the pull rope.

[0036] Furthermore, one end of the connecting sleeve 11 is fixedly connected to an elastic sheet 111 in the limiting cylinder 9, and a wedge-shaped portion is provided at one end of the elastic sheet 111 away from the connecting sleeve 11. A clamping ring 902 is fixedly connected in the limiting cylinder 9, and the wedge-shaped portion of the elastic sheet 111 passes through the clamping ring 902 and is clamped on the end face of the clamping ring 902. The connecting sleeve 11 is a stepped shaft structure, and a stepped portion adapted to the connecting sleeve 11 is provided on the side of the adjusting ring 2 away from the elastic sheet 111.

[0037] Specifically, there are multiple elastic sheets 111 arranged around the circumference of the connecting sleeve 11, which can be metal elastic sheets, plastic elastic sheets, etc. The distance between the elastic sheet 111 and the axis of the connecting sleeve 11 is smaller than the distance between the wedge-shaped portion and the axis of the connecting sleeve 11. Therefore, after the wedge-shaped portion passes through the inner side of the clamping ring 902, a limiting constraint is formed on the end face of the clamping ring 902 away from the connecting sleeve 11, thereby locking the limiting cylinder 9 and the adjusting ring 2 in the axial direction, thereby facilitating assembly and disassembly.

[0038] In addition, the inner side of the adjustment ring 2 is in a stepped hole structure, and the stepped portion of the stepped hole limits the stepped portion of the connecting sleeve 11 .

[0039] Furthermore, the inner circumference of the connecting sleeve 11 is in the form of an inner hexagonal hole, and the circumference of the output shaft 403 is in the form of a matching outer hexagonal structure.

[0040] Specifically, the hexagonal hole is adapted to the outer hexagonal structure of the output shaft 403 , thereby achieving the purpose of transmitting the torque of the output shaft 403 to the connecting sleeve 11 in the circumferential direction, and also facilitating assembly and disassembly in the axial direction.

[0041] like Figure 2 、 3 The following describes the specific connection structure between the fixing rod 3 and the light-transmitting cloth 1:

[0042] Furthermore, grooves 302 are provided on both sides of the fixing rod 3, and the opening direction of the groove 302 is horizontal. The top inner wall of the groove 302 is fixedly connected to the clamping strip 301, and a gap is set between the bottom of the clamping strip 301 and the bottom inner wall of the groove 302. One end of the translucent roll cloth 1 passes through the groove 302 from under the clamping strip 301 and is connected to a limiting strip 303. The width of the limiting strip 303 is greater than the gap below the clamping strip 301.

[0043] Specifically, the groove 302 is on the side of the fixed rod 3 and is distributed along the length direction of the fixed rod 3. The snap-in strip 301 can be inserted into the groove 302 from one end of the fixed rod 3, thereby fixing the end of the translucent cloth 1 away from the reel 7 in the groove 302. In the vertical direction, the translucent cloth 1 is constrained and limited, so that the translucent cloth 1 forms a double-layer structure and can only be raised and lowered when the reel 7 rotates. The snap-in strip 301 can be located in any one of the grooves 302. The snap-in strip 301 is made of rubber and can be connected to the translucent cloth 1 by bonding or stapling.

[0044] In addition, the width of the limiting strip 303 refers to the cross-sectional width of the limiting strip 303 .

[0045] Furthermore, the fixing rod 3 is a hollow structure, and the side of the spring roller shutter device 4 is fixedly connected to the plug-in block 401, and the plug-in block 401 is inserted into the end opening of the fixing rod 3;

[0046] The spring roller 4 is provided with a coil spring 10 , one end of the coil spring 10 is connected to a rotating shaft 404 , the rotating shaft 404 is rotatably connected to the spring roller 4 , and the rotating shaft 404 is fixedly connected to the output shaft 403 .

[0047] Specifically, a cavity is set in the spring roller 4, and the cavity opening is connected to the cover plate 402 by screws. A coil spring 10 is set in the cavity, and one end of the outer side of the coil spring 10 is fixedly connected to the inner wall of the cavity, and one end of the inner side is fixedly connected to the rotating shaft 404. The rotating shaft 404 is rotatably connected to the spring roller 4, and one end extending from the spring roller 4 is fixedly connected to the output shaft 403.

[0048] Since grooves 320 are provided on both sides of the fixing rod 3, the hollow part thereof is in a "convex" shape. The plug-in block 401 is adapted to the "convex" structure and includes a base plate on which two vertical plates are fixedly connected. The plug-in block 401 forms an interference fit with the hollow part of the fixing rod 3 to ensure a stable connection.

[0049] like Figure 6 、 7 , the specific connection structure of the lower pull rod 5 is described below:

[0050] Furthermore, the lower pull rod 5 is provided with an opening portion facing upward, and a fixed shaft 8 is provided in the opening portion. The two ends of the fixed shaft 8 are detachably connected to the fixing plates 6, and the fixing plates 6 are detachably connected to the ends of the lower pull rod 5. The bottom of the translucent roll cloth 1 is sleeved under the fixed shaft 8.

[0051] Specifically, the light-transmitting cloth 1 passes under the fixed shaft 8 and extends upward, forming a structure in which the light-transmitting cloth 1 holds up the bottom of the fixed shaft 8 . When the lower pull rod 5 is pulled downward, the light-transmitting cloth 1 slides on the fixed shaft 8 .

[0052] Furthermore, the cross-section of the pull-down rod 5 is a "U"-shaped structure, with a horizontal plate 501 fixedly connected in its opening, the fixed shaft 8 is located above the horizontal plate 501, and two support blocks 502 are fixedly connected below the horizontal plate 501 and on the inner wall of the bottom of the pull-down rod 5. The side of the fixing plate 6 is fixedly connected to two plug-in plates 601, and the two plug-in plates 601 are inserted into the opening of the pull-down rod 5 and are respectively located between the horizontal plate 501 and the support blocks 502. The fixed shaft 8 is a hollow structure, and the fixing plate 6 is fixedly connected to the plug-in rod 602 inserted into the fixed shaft 8.

[0053] Specifically, the fixing plate 6 is located at both ends of the length direction of the lower pull rod 5, and the cross plate 501 and the fixed shaft 8 are distributed along the length direction of the lower pull rod 5. The cross plate 501 forms a hollow structure at the lower end of the fixing plate 6, and the two plug-in plates 601 are symmetrically distributed, with their bottoms abutting the support block 502 and their tops abutting the cross plate 501. The plug-in plates 601 are in an arc-shaped structure that matches the "U"-shaped structure of the lower pull rod 5. An interference fit is formed between the plug-in plates 601 and the cross plate 501 and the support block 502, so that the fixing plate 6 is fixed to the end of the lower pull rod 5. At the same time, the plug-in rod 602 of the fixing plate 6 supports the fixed shaft 8 to be suspended in the air, so that the bottom of the fixed shaft 8 is convenient for passing the light-transmitting roll cloth 1, thereby facilitating assembly and disassembly.

[0054] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A double-layered light-blocking spring roller blind comprising a light-transmitting roller cloth (1), characterized in that: The light-transmitting roll cloth (1) is provided with a plurality of shading portions (101) arranged side by side and distributed at equal intervals. The light-transmitting roll cloth (1) is distributed in a "U" shape, one end of the top thereof is wound on the drum (7), and the other end of the top thereof is detachably connected to the fixed rod (3). The bottom of the light-transmitting roll cloth (1) is rotatably sleeved on the lower pull rod (5), and both ends of the fixed rod (3) are provided with a winding mechanism, and the winding mechanism includes a spring roller (4) detachably connected to the end of the fixed rod (3), and the end of the drum (7) is connected to the output shaft (403) of the spring roller (4). The spring roller (4) is used to rotate the drum (7), so that the light-transmitting roll cloth (1) is raised and lowered, and can stay at any height; The winding mechanism further comprises a limiting cylinder (9) inserted into the end of the reel (7), the end of the limiting cylinder (9) away from the reel (7) is detachably connected to the adjusting ring (2), and the limiting cylinder (9) is connected to the output shaft (403); The winding mechanism further comprises a connecting sleeve (11) sleeved on the output shaft (403), the connecting sleeve (11) passes through the adjusting ring (2) and is located in the limiting cylinder (9), one end face of the adjusting ring (2) is fixedly connected to the arc-shaped plate (201) adapted to the limiting cylinder (9), the arc-shaped plate (201) is inserted into the limiting cylinder (9), the inner circumference of the limiting cylinder (9) is fixedly connected to two stoppers (903), the two ends of the arc-shaped plate (201) respectively abut against the stoppers (903), the outer circumference of the connecting sleeve (11) is fixedly connected to a fixed block (112), and the fixed block (112) is located between the two ends of the arc-shaped plate (201); One end of the connecting sleeve (11) located in the limiting cylinder (9) is fixedly connected to an elastic sheet (111), and an end of the elastic sheet (111) away from the connecting sleeve (11) is provided with a wedge-shaped portion. A clamping ring (902) is fixedly connected in the limiting cylinder (9), and the wedge-shaped portion of the elastic sheet (111) passes through the clamping ring (902) and is clamped on the end face of the clamping ring (902). The connecting sleeve (11) is a stepped shaft structure, and a stepped portion adapted to the connecting sleeve (11) is provided on the side of the adjusting ring (2) away from the elastic sheet (111).

2. The double-layer shading spring roller blind according to claim 1, characterized in that: The outer circumference of the limiting cylinder (9) is provided with a plurality of limiting protrusions (901), and the inner circumference of the winding drum (7) is provided with a plurality of inner protrusions (701), and adjacent two inner protrusions (701) are spaced apart to form a card slot, and the limiting protrusions (901) are inserted into the card slot one by one.

3. The double-layer shading spring roller blind according to claim 1, characterized in that: The inner circumference of the connecting sleeve (11) is in the form of an inner hexagonal hole, and the circumference of the output shaft (403) is in the form of an adapted outer hexagonal structure.

4. The double-layer shading spring roller blind according to claim 1, characterized in that: Grooves (302) are provided on both sides of the fixing rod (3), the opening direction of the groove (302) is horizontal, the top inner wall of the groove (302) is fixedly connected to the clamping strip (301), and a gap is provided between the bottom of the clamping strip (301) and the bottom inner wall of the groove (302), one end of the light-transmitting rolled cloth (1) is inserted into the groove (302) from below the clamping strip (301) and is connected to a limiting strip (303), and the width of the limiting strip (303) is greater than the gap below the clamping strip (301).

5. The double-layer shading spring roller blind according to claim 1, characterized in that: The fixing rod (3) is a hollow structure, the spring curtain roller (4) is fixedly connected to a plug-in block (401) on the side, and the plug-in block (401) is inserted into the end opening of the fixing rod (3); A coil spring (10) is provided in the spring curtain roller (4), one end of the coil spring (10) is connected to a rotating shaft (404), the rotating shaft (404) is rotatably connected to the spring curtain roller (4), and the rotating shaft (404) is fixedly connected to the output shaft (403).

6. The double-layered shading spring roller blind according to claim 1, characterized in that: The lower pull rod (5) is provided with an opening portion opening upward, a fixed shaft (8) is provided in the opening portion, both ends of the fixed shaft (8) are detachably connected to the fixing plates (6), the fixing plates (6) are detachably connected to the ends of the lower pull rod (5), and the bottom of the light-transmitting roll cloth (1) is sleeved below the fixed shaft (8).

7. The double-layered shading spring roller blind according to claim 6, characterized in that: The cross section of the lower pull rod (5) is a "U"-shaped structure, wherein a transverse plate (501) is fixedly connected in its opening, the fixed shaft (8) is located above the transverse plate (501), two support blocks (502) are fixedly connected below the transverse plate (501) and on the inner wall of the bottom of the lower pull rod (5), and two plug-in plates (601) are fixedly connected to the side of the fixing plate (6), and the two plug-in plates (601) are inserted into the opening of the lower pull rod (5) and are respectively located between the transverse plate (501) and the support blocks (502); The fixed shaft (8) is a hollow structure, and the fixed sheet (6) is fixedly connected to the plug-in rod (602) inserted into the fixed shaft (8).

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