Pull rod type roller shutter capable of automatically descending

Abstract

The utility model relates to the technical field of curtains, and discloses a pull rod type roller shutter capable of automatically descending, which comprises a roller shutter controller used for controlling roller shutter cloth to ascend and descend, the roller shutter controller comprises a roller shutter cylinder, a first shell and a second shell, the first shell and the second shell are oppositely arranged, and the roller shutter cylinder is rotatably arranged between the first shell and the second shell. The roller shutter barrel is connected with the roller shutter cloth, the roller shutter cloth is driven to ascend and descend through rotation of the roller shutter barrel, and a first limiting mechanism used for limiting the ascending position of the roller shutter cloth is arranged on the first shell so that the roller shutter cloth can have the ascending limit position. According to the pull rod type roller shutter capable of automatically descending, when the curtain cloth ascends to the highest position, the curtain cloth is limited through the first limiting mechanism, so that the curtain cloth cannot be continuously pulled upwards, the problem that the curtain cloth cannot be normally used due to the fact that the curtain cloth is pulled upwards and overturns to the other side is solved, and the use experience is good.

Description

Technical Field

[0001] The utility model relates to the technical field of curtains, in particular to a pull-rod type rolling curtain which can be automatically lowered. Background Art

[0002] Roller blinds are a type of window decoration product. Curtain fabric is processed with resin and rolled into a roller shape. It is raised and lowered by a pull rope or chain, and is simple and convenient to operate. The roller blinds include two relatively arranged fixing frames, which are used to fix the roller blinds to the wall. The roller blind rod is arranged between the two fixing frames. Because different users have different lighting requirements at different time periods, the roller blinds need to stay at any position. The patent with application number 202120973189.8 proposes a spring roller blind that can be started and stopped at will, which can make the roller blind stay at any position and achieve retraction; the patent with application number 202121033774.6 proposes a spring roller blind that can be pre-loaded in advance, which can also make the roller blind stay at any position and achieve retraction ; In the patent with application number 202220225842.7, an automatic descending or rising roller blind is proposed. The user pulls the rope to drive the roller blind to rise or fall. After cooperating with any start-stop structure or a spring roller blind that can be pre-loaded, the roller blind can stop at any position and realize the function of automatic descending or automatic rising. In the existing roller blinds, the user pulls the rope to drive the roller blind to rise or fall. When the curtain cloth rises to the highest position, the user should stop pulling the rope to prevent the roller blind from continuing to rise. In actual use, it is difficult for the user to control the distance that the rope is pulled down, or due to misoperation, the curtain cloth rises to the highest position, and the rope is still pulled, causing the curtain cloth to flip to the other side, resulting in the problem that it cannot be used normally, resulting in a poor user experience. Utility Model Content

[0003] In order to solve at least one aspect of the above problems, the utility model provides a pull-rod roller blind that can be automatically lowered, including: a roller blind controller for controlling the lifting and lowering of the roller blind cloth, the roller blind controller including a roller blind drum and a first shell and a second shell that are relatively arranged, the roller blind drum is rotatably arranged between the first shell and the second shell, the roller blind drum is connected to the roller blind cloth, and the roller blind cloth is driven to be lifted and lowered by the rotation of the roller blind drum, the first shell is provided with a first limiting mechanism for limiting the rising position of the roller blind cloth, so that the roller blind cloth has an upper limit position; the first limiting mechanism A limiting mechanism includes a first screw and a first rotating sleeve threadedly sleeved on the first screw, the first screw is fixedly connected to the first shell, the first rotating sleeve is connected to the rolling curtain drum and rotates synchronously with the rolling curtain drum, and one end of the first screw is provided with a first limiting piece for limiting the first rotating sleeve; the pull-rod type rolling curtain of the utility model can automatically descend, and when the curtain cloth rises to the highest position, it is limited by the first limiting mechanism, so that the rolling curtain cloth cannot be pulled up further, thereby avoiding the problem that the rolling curtain cloth is pulled up too much and flipped to the other side, resulting in abnormal use, and the user experience is good.

[0004] Optionally, the first limiting member is arranged at an end of the first screw away from the second shell body, and when the rolling curtain drum rotates to drive the rolling curtain cloth to rise, the rolling curtain drum drives the first rotating sleeve to rotate so that the first rotating sleeve approaches the first limiting member, and the first rotating sleeve is limited when it abuts against the first limiting member.

[0005] Optionally, a first limiting step is provided on a side of the first rotating sleeve close to the first limiting member, and a first limiting groove corresponding to the first limiting step is provided on the first limiting member.

[0006] Optionally, a plurality of the first limiting steps are arranged in an annular manner with equal intervals, a first guiding bevel is arranged on the first limiting step, and a second guiding bevel corresponding to the first guiding bevel is arranged at the first limiting groove.

[0007] Optionally, the first screw rod is provided with a first external thread for threading the first rotating sleeve, and the first external thread is provided with a first pitch-increasing thread at one end close to the first limiting member, and the pitch of the first pitch-increasing thread is greater than the pitch of the first external thread.

[0008] Optionally, the second shell is provided with a second limiting mechanism for limiting the descending position of the rolling blind cloth so that the rolling blind cloth has a descending limit position, the second limiting mechanism includes a second screw and a second rotating sleeve threadedly sleeved on the second screw, the second screw is fixedly connected to the second shell, the second rotating sleeve is connected to the rolling blind drum and rotates synchronously with the rolling blind drum, and one end of the second screw is provided with a second limiting piece for limiting the second rotating sleeve.

[0009] Optionally, the second limiting member is arranged at an end of the second screw rod away from the first housing, and when the rolling curtain drum rotates to drive the rolling curtain cloth to descend, the rolling curtain drum drives the second rotating sleeve to rotate so that the second rotating sleeve is close to the second limiting member, and the second rotating sleeve is limited when it abuts against the second limiting member; a second limiting step is arranged on the side of the second rotating sleeve close to the second limiting member, a second limiting groove corresponding to the second limiting step is arranged on the second limiting member, a plurality of second limiting steps are arranged in an annular manner with equal intervals, a third guide bevel is arranged on the second limiting step, and a fourth guide bevel corresponding to the third guide bevel is arranged at the second limiting groove, a second external thread for threading the second rotating sleeve is arranged on the second screw, and a second pitch-increasing thread is arranged on the end of the second external thread close to the second limiting member, and the pitch of the second pitch-increasing thread is greater than the pitch of the second external thread.

[0010] Optionally, the first screw, the second screw and the rolling curtain cylinder are coaxially arranged, and when the rolling curtain cylinder rotates to drive the rolling curtain part to rise, the first rotating sleeve and the second rotating sleeve both move toward the first limiting member; when the rolling curtain cylinder rotates to drive the rolling curtain part to descend, the first rotating sleeve and the second rotating sleeve both move toward the second limiting member.

[0011] Optionally, the second shell is provided with a locking and releasing mechanism for locking / releasing the height of the rolling curtain cloth, and when the rolling curtain cloth rises to a required height, the rolling curtain cloth is locked by the locking and releasing mechanism; when the rolling curtain cloth needs to be lowered, the rolling curtain cloth is released by the locking and releasing mechanism, so that the rolling curtain cloth descends under the action of its own gravity; the locking and releasing mechanism includes a fixed shaft fixedly connected to the second shell, one end of the fixed shaft away from the second shell is fixedly connected to the second screw rod, a rotating seat for connecting the rolling curtain drum is rotatably sleeved on the fixed shaft, the rotating seat rotates synchronously with the rolling curtain drum, and the fixed shaft is rotatably sleeved with a slide groove member and a clamping spring, one end of the clamping spring is connected to the slide groove member The sliding groove part is connected, and the sliding groove part realizes unidirectional rotation through the clamping spring. The rotation direction of the sliding groove part is the same as the rotation direction of the rolling curtain drum when it rises. Two positioning beads are arranged between the rotating seat and the sliding groove part, and the rotating seat is provided with a horizontal sliding groove for the positioning beads to slide horizontally. The axis of the sliding groove part is taken as the rotation center, and the two positioning beads are distributed at 90 degrees. The sliding groove part is provided with a first slideway and a second slideway that are connected to each other. When the locking and releasing mechanism is locked, one of the positioning beads slides to the first positioning part of the first slideway. When the rolling curtain cloth rises, one of the positioning beads slides to the second positioning part of the first slideway. When the locking and releasing mechanism is released, both of the positioning beads slide into the second slideway.

[0012] Optionally, a pull rod handle is provided on the first shell for driving the rolling curtain drum to rotate and rise, a reducer is connected to the end of the first screw away from the first shell, and the second shell includes a rotating adjustment plate for adjusting the height of the rolling curtain cloth's lowering limit position, and the rotating adjustment plate is fixedly connected to the fixed shaft.

[0013] Compared with the prior art, the pull-rod roller blind of the utility model which can automatically descend is limited by the first limit mechanism when the curtain cloth rises to the highest position, so that the roller blind cloth cannot be pulled up further, thereby avoiding the problem that the roller blind cloth is pulled up too much and flipped to the other side, resulting in the problem that it cannot be used normally; a first distance-increasing thread is arranged at one end of the first external thread close to the first limit piece, and the pitch of the first distance-increasing thread is greater than the pitch of the first external thread, so that when the first rotating sleeve rotates to the first distance-increasing thread, the speed at which the first rotating sleeve approaches the first limit piece is increased, that is, when the first rotating sleeve rotates at the same angle, the axial displacement of the first rotating sleeve screwed in along the first distance-increasing thread is larger, so that the first limit step of the first rotating sleeve is quickly and accurately stuck in the first limit groove for limiting, and the structure is reliable; A limiting mechanism and a second limiting mechanism enable the rolling blind to be limited at the highest position and the lowest position; when the rolling blind cloth rises to the required height, the rolling blind cloth is locked by means of a locking and releasing mechanism; when the rolling blind cloth needs to be lowered, the rolling blind cloth is released by means of a locking and releasing mechanism, so that the rolling blind cloth descends under the action of its own gravity. The operation is convenient and the user can stop the rolling blind at the required height position. Two positioning beads distributed at 90 degrees are provided, so that the positioning beads only need to rotate the rotating seat a quarter of a circle to slide from the first positioning part to the second positioning part. The curtain rope or the pull rope handle only needs to be pulled down a short distance to drive the rolling blind cloth to rise. The curtain rope or the pull rope handle only needs to be pulled down a short distance and then the rolling blind rope or the pull rope handle can be suspended, providing a good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the pull-rod type roller blind that can automatically descend according to the utility model;

[0015] Figure 2 This is a schematic diagram of the structure inside the roller shutter cylinder of the pull rod type roller shutter that can automatically descend according to the utility model;

[0016] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0017] Figure 4 for Figure 2 Enlarged view of middle part B;

[0018] Figure 5 It is a structural schematic diagram of the pull rod type roller blind sliding channel part that can automatically descend according to the utility model;

[0019] Figure 6 for Figure 5 Enlarged view of the middle C part;

[0020] Figure 7 It is a structural schematic diagram of the holding spring part of the pull-rod type rolling curtain that can automatically descend according to the utility model;

[0021] Figure 8 It is a structural schematic diagram of the first slideway and the second slideway of the pull-rod type roller blind that can automatically descend according to the utility model;

[0022] Fig. 9 It is a schematic diagram of the structure of the pull-rod type rolling curtain rotating seat that can automatically descend according to the utility model;

[0023] The names of the components corresponding to the reference numerals in the figure are: 1 is the first housing, 2 is the second housing, 3 is the roller shutter cylinder, 4 is the first screw, 41 is the first limiting member, 411 is the first limiting groove, 412 is the second guide slope, 42 is the first external thread, 421 is the first distance increasing thread, 5 is the first rotating sleeve, 51 is the first limiting step, 511 is the first guide slope, 6 is the second screw, 61 is the second limiting member, 611 is the second limiting groove, 62 is the second external thread, 621 is the second distance increasing thread, 7 It is the second rotating sleeve, 71 is the second limiting step, 711 is the third guide slope, 8 is the fixed shaft, 81 is the rotating seat, 811 is the horizontal slide groove, 82 is the slide groove member, 821 is the first slide, 8211 is the first positioning part, 8212 is the second positioning part, 822 is the second slide, 83 is the clamping spring, 9 is the positioning bead, 10 is the pull rod handle, 11 is the reducer, 12 is the rotating adjustment plate, 13 is the plug-in square shaft, 14 is the square hole, 15 is the inclined guide block, 16 is the guide groove, and 17 is the limiting groove. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the description of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate positions or location relationships that are based on the positions or location relationships when the product is in normal use.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0027] See also Figure 1-Figure 9The utility model provides a pull-rod roller blind that can be automatically lowered, including: a roller blind controller for controlling the lifting and lowering of the roller blind cloth, the roller blind controller includes a roller blind drum 3 and a first shell 1 and a second shell 2 that are relatively arranged, the roller blind drum 3 is rotatably arranged between the first shell 1 and the second shell 2, the roller blind drum 3 is fixedly connected to the upper end of the roller blind cloth, and the roller blind cloth is lifted and lowered by the rotation of the roller blind drum 3, and a first limiting mechanism for limiting the rising position of the roller blind cloth is arranged on the first shell 1, so that the roller blind cloth has an ascending limit position; the first limiting mechanism includes a first screw rod 4 and a first rotating sleeve 5 that is threadedly sleeved on the first screw rod 4, and the first rotating sleeve 5 moves along the axial direction of the first screw rod 4 when rotating; the first screw The rod 4 is fixedly connected to the first shell 1, the first rotating sleeve 5 is connected to the rolling shutter drum 3 and rotates synchronously with the rolling shutter drum 3, and one end of the first screw rod 4 is provided with a first limit piece 41 for limiting the first rotating sleeve 5. When the rolling shutter rises, the first rotating sleeve 5 rotates and moves to one side of the first limit piece 41. When the rolling shutter rises to the highest position, the first rotating sleeve 5 is against the upper limit of the first limit piece 41, so that the rolling shutter cannot continue to rise, and the use is reliable. The pull-rod type rolling shutter that can automatically descend of the utility model is limited by the first limit mechanism when the curtain cloth rises to the highest position, so that the rolling shutter cloth cannot be pulled up further, thereby avoiding the problem that the rolling shutter cloth is pulled up too much and flipped to the other side, resulting in abnormal use, and the user experience is good.

[0028] See also Figure 1-Figure 3The first limiting member 41 is arranged at the end of the first screw 4 away from the second housing 2. When the rolling curtain drum 3 rotates to drive the rolling curtain cloth to rise, the rolling curtain drum 3 drives the first rotating sleeve 5 to rotate, so that the first rotating sleeve 5 is close to the first limiting member 41. When the first rotating sleeve 5 abuts against the first limiting member 41, it is limited. The structural design is reasonable; a first limiting step 51 is arranged on the side of the first rotating sleeve 5 close to the first limiting member 41, and a first limiting groove 411 corresponding to the first limiting step 51 is arranged on the first limiting member 41. When the first rotating sleeve 5 abuts against the first limiting member 41 for limiting, the first limiting step 51 is correspondingly inserted into the first limiting groove 411 for limiting, and the limiting effect is good; a plurality of first limiting steps 51 are arranged in an annular shape at equal intervals, and a first guiding inclined surface 511 is arranged on the first limiting step 51. The first limiting groove 4 A second guide bevel 412 corresponding to the first guide bevel 511 is provided at 11, so that the first limiting step 51 can be screwed into the first limiting groove 411 for limiting; the first screw rod 4 is provided with a first external thread 42 for screwing the first rotating sleeve 5, and the first external thread 42 is provided with a first pitch-increasing thread 421 at one end close to the first limiting member 41. The pitch of the first pitch-increasing thread 421 is greater than the pitch of the first external thread 42, so that when the first rotating sleeve 5 rotates to the first pitch-increasing thread 421, the speed at which the first rotating sleeve 5 approaches the first limiting member 41 is increased, that is, when the first rotating sleeve 5 rotates at the same angle, the axial displacement of the first rotating sleeve 5 screwed in along the first pitch-increasing thread 421 is larger, so that the first limiting step 51 of the first rotating sleeve 5 can be quickly and accurately inserted into the first limiting groove 411 for limiting, and the structure is reliable.

[0029] See also Figure 1-Figure 4The second housing 2 is provided with a second limiting mechanism for limiting the lowering position of the rolling blind cloth, so that the rolling blind cloth has a lowering limit position, the second limiting mechanism includes a second screw rod 6 and a second rotating sleeve 7 threadedly sleeved on the second screw rod 6, and the second rotating sleeve 7 moves along the axial direction of the second screw rod 6 when rotating; the second screw rod 6 is fixedly connected to the second housing 2, the second rotating sleeve 7 is connected to the rolling blind drum 3 and rotates synchronously with the rolling blind drum 3, and one end of the second screw 6 is provided with a second limiting member 61 for limiting the second rotating sleeve 7; the second limiting member 61 is arranged at the end of the second screw 6 away from the first housing 1, and the rolling blind cloth has a lower limit position, and ... member 61 is arranged at the end of the second screw 6 away from the first housing 1, and the rolling blind cloth has a lower limit position, and the second limiting member 61 is arranged at the end of the second screw 6 away from the first housing 1, and the rolling blind cloth has a lower limit position, and the second limiting member 61 is arranged at the end of the second screw 6 away from the first housing 1, and the rolling blind cloth has a lower limit position, and the second limiting member 61 is arranged at the end of the second screw 6 away from the first housing 1, and the rolling blind When the curtain drum 3 rotates to drive the rolling curtain cloth to descend, the rolling curtain drum 3 drives the second rotating sleeve 7 to rotate, so that the second rotating sleeve 7 is close to the second limiting piece 61, and the second rotating sleeve 7 is limited when it abuts against the second limiting piece 61; a second limiting step 71 is provided on the side of the second rotating sleeve 7 close to the second limiting piece 61, and a second limiting groove 611 corresponding to the second limiting step 71 is provided on the second limiting piece 61, and a plurality of second limiting steps 71 are arranged in an annular manner at equal intervals, a third guide inclined surface 711 is provided on the second limiting step 71, and a fourth guide inclined surface 711 corresponding to the third guide inclined surface 711 is provided at the second limiting groove 611. The inclined surface 612 facilitates the second limiting step 71 to be screwed into the second limiting groove 611 for limiting. The second screw rod 6 is provided with a second external thread 62 for screwing the second rotating sleeve 7. The second external thread 62 is provided with a second distance increasing thread 621 at one end close to the second limiting member 61. The pitch of the second distance increasing thread 621 is greater than the pitch of the second external thread 62. When the second rotating sleeve 7 rotates to the second distance increasing thread 621, the speed at which the second rotating sleeve 7 approaches the second limiting member 61 is increased. That is, when the second rotating sleeve 7 rotates at the same angle, the axial displacement of the second rotating sleeve 7 screwed in along the second distance increasing thread 621 is greater. The first and second limiting mechanisms are large, so that the second limiting step 71 of the second rotating sleeve 7 can be quickly and accurately inserted into the second limiting groove 611 for limiting, and the structure is reliable; the first screw 4, the second screw 6 and the rolling curtain cylinder 3 are coaxially arranged, and when the rolling curtain cylinder 3 rotates to drive the rolling curtain part to rise, the first rotating sleeve 5 and the second rotating sleeve 7 both move toward the first limiting member 41; when the rolling curtain cylinder 3 rotates to drive the rolling curtain part to descend, the first rotating sleeve 5 and the second rotating sleeve 7 both move toward the second limiting member 61. Through the first limiting mechanism and the second limiting mechanism, the rolling curtain can be limited at the highest position and the lowest position, and the user experience is good.

[0030] See also Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9The second housing 2 is provided with a locking and releasing mechanism for locking / releasing the height of the rolling curtain. When the rolling curtain rises to a desired height, the rolling curtain is locked by the locking and releasing mechanism. When the rolling curtain needs to be lowered, the rolling curtain is released by the locking and releasing mechanism, so that the rolling curtain can be lowered under the action of its own gravity. The operation is convenient and the user can stop the rolling curtain at a desired height. The locking and releasing mechanism includes a fixed shaft 8 fixedly connected to the second housing 2, and one end of the fixed shaft 8 away from the second housing 2 is fixed to the second screw 6. The fixed shaft 8 is rotatably sleeved with a rotating seat 81 for connecting the rolling shutter cylinder 3. The rotating seat 81 rotates synchronously with the rolling shutter cylinder 3. The fixed shaft 8 is rotatably sleeved with a slide groove member 82 and a clamping spring 83. One end of the clamping spring 83 is connected to the slide groove member 82. The support leg at one end of the clamping spring 83 is plugged into the slide groove member 82. The slide groove member 82 realizes unidirectional rotation through the clamping spring 83. The rotation direction of the slide groove member 82 is the same as the rotation direction of the rolling shutter cylinder 3 when it rises. When the slide groove member 82 rotates in the other direction, the clamping spring 83 will clamp the roller 3. The fixed shaft 8, that is, the slide member 82 in this direction cannot rotate; two positioning beads 9 are arranged between the rotating seat 81 and the slide member 82, and a horizontal slide 811 for the positioning beads 9 to slide horizontally is arranged on the rotating seat 81. There are two horizontal slides 811 and they correspond to the two positioning beads 9 respectively. When the rotating seat 81 rotates, the two positioning beads 9 are driven to slide along the two slideways on the slide member 82; the axis of the slide member 82 is the rotation center, and the two positioning beads 9 are distributed at 90 degrees; the slide member 82 is provided with a first slideway 811 connected to each other. 21 and the second slideway 822, when the locking and releasing mechanism is locked, one of the positioning beads 9 slides to the first positioning portion 8211 of the first slideway 821; when the rolling curtain cloth rises, one of the positioning beads 9 slides to the second positioning portion 8212 of the first slideway 821; when the locking and releasing mechanism is released, both positioning beads 9 slide into the second slideway 822; along the circumferential direction of the slideway member 82, there are two first positioning portions 8211 distributed 180 degrees around the circumference, and there are two second positioning portions 8212 distributed 180 degrees around the circumference;

[0031] In normal state, the rolling curtain is suspended at its current height, at which time the locking release mechanism is locked, and one of the positioning beads 9 slides to the first positioning portion 8211 of the first slide 821 for positioning, at which time the slide member 82 and the rolling curtain stop rotating; when the rolling curtain needs to be raised, the rolling curtain rope or the pull rope handle is pulled down so that one of the positioning beads 9 can slide to the second positioning portion 8212, at which time the slide member 82 and the rotating seat 81 are driven by this positioning bead 9 to rotate synchronously in the direction of the rolling curtain rising, thereby realizing the function of raising the rolling curtain; after pulling up the rolling curtain rope or the pull rope handle once and releasing it, at which time one of the positioning beads 9 is The positioning bead 9 can slide along the first slide 821 to the first positioning portion 8211 for positioning. At this time, the slide member 82 and the roller blind stop rotating. The rising position of the roller blind portion can be controlled by pulling up the roller blind rope or the pull rope handle several times and then releasing it. It is easy to use. When the roller blind portion needs to be lowered, the roller blind rope or the pull rope handle is pulled down slightly to make the positioning bead 9 located at the first positioning portion 8211 slide to the second slide 822. At this time, the roller blind rope or the pull rope handle is released, and the two positioning beads 9 both slide circumferentially along the second slide 822 until the roller blind cloth drops to the preset lowering limit position and is suspended. The roller blind cloth can be automatically lowered by pulling down the roller blind rope or the pull rope handle at any time as needed to perform an upward hovering operation, thereby interrupting the continued descent of the roller blind cloth, which is convenient to use. In this embodiment, two positioning beads 9 are provided, and the roller blind cloth can be more finely adjusted and locked compared to providing one positioning bead 9. If only one positioning bead 9 is provided, the positioning bead 9 needs to slide from the first positioning part 8211 to the second positioning part 8211 during use, and the rotating seat 81 needs to rotate half a circle in the circumference, resulting in the roller blind rope or the pull rope handle needing to be pulled down a longer distance to drive the roller blind cloth To make the curtain rise, the curtain rope or the pull rope handle needs to be pulled down for a long distance and then the curtain rope or the pull rope handle needs to be released to suspend the curtain cloth, which results in a poor user experience. In this embodiment, two positioning beads 9 are arranged at 90 degrees, so that the positioning beads 9 only need to rotate the rotating seat 81 a quarter of a circle, i.e. 90 degrees, from the first positioning part 8211 to the second positioning part 8211. The curtain rope or the pull rope handle only needs to be pulled down for a short distance to drive the curtain cloth to rise. The curtain rope or the pull rope handle only needs to be pulled down for a short distance and then the curtain rope or the pull rope handle needs to be released to suspend the curtain cloth, which results in a good user experience.

[0032] See also Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 7The first housing 1 is provided with a pull rod handle 10 for driving the rolling curtain drum 3 to rotate and rise, and the upper end of the pull rod handle 10 is connected to a rolling curtain rope for driving the rolling curtain drum 3 to rotate. The operation is more convenient by pulling the rolling curtain rope by the pull rod handle 10; the end of the first screw 4 away from the first housing 1 is connected to a reducer 11 for limiting the speed of the rolling curtain drum 3 descending; the second housing 2 includes a rotating adjustment plate 12 for adjusting the height of the lowering limit position of the rolling curtain cloth, the rotating adjustment plate 12 is fixedly connected to the fixed shaft 8, the rotating adjustment plate 12, the fixed shaft 8 and the second screw 6 rotate synchronously, and the adjusting plate 12 is manually rotated to bring the rolling curtain drum 3 to rotate without rotating. The second screw rod 6 is driven to rotate to realize the function of adjusting the height of the roller blind cloth's lowering limit position to meet different usage scenarios and provide a good user experience; a plug-in square shaft 13 is provided at one end of the fixed shaft 8 close to the second screw rod 6, and a bevel guide block 15 is provided on the plug-in square shaft 13. A square hole 14 for plugging with the plug-in square shaft 13 is provided on the second screw 6, and a guide groove 16 and a limit groove 17 corresponding to the bevel guide block 15 are provided on the hole wall of the square hole 14. The bevel guide block 15 enters the limit groove 17 through the guide groove 16 to limit the position, making it easier to assemble the fixed shaft 8 and the second screw 6, and the structure is stable after assembly, and there is no need to fix it with bolts or other parts.

[0033] The pull-rod type roller blind of the utility model can automatically descend, and when the curtain cloth rises to the highest position, it is limited by the first limit mechanism, so that the roller blind cloth cannot be pulled up further, and the problem that the roller blind cloth is pulled up too much and flips over to the other side, resulting in the problem that it cannot be used normally, is avoided, and the user experience is good; a first distance increasing thread is arranged at one end of the first external thread close to the first limit piece, and the pitch of the first distance increasing thread is greater than the pitch of the first external thread, so that when the first rotating sleeve is rotated to the first distance increasing thread, the speed at which the first rotating sleeve approaches the first limit piece is increased, that is, when the first rotating sleeve is rotated at the same angle, the axial displacement of the first rotating sleeve screwed in along the first distance increasing thread is greater, which is convenient for the first limiting step of the first rotating sleeve to be quickly and accurately stuck in the first limiting groove for limiting, and the structure is reliable; through the first The limiting mechanism and the second limiting mechanism enable the rolling blind to be limited at the highest position and the lowest position; when the rolling blind cloth rises to the required height, the rolling blind cloth is locked by means of the locking and releasing mechanism; when the rolling blind cloth needs to be lowered, the rolling blind cloth is released by means of the locking and releasing mechanism, so that the rolling blind cloth can be lowered under the action of its own gravity. The operation is convenient and the user can stop the rolling blind at the required height position. Two positioning beads distributed at 90 degrees are provided, so that the positioning beads only need to rotate the rotating seat a quarter of a circle to slide from the first positioning part to the second positioning part. The curtain rope or the pull rope handle only needs to be pulled down a short distance to drive the rolling blind cloth to rise. The curtain rope or the pull rope handle only needs to be pulled down a short distance and then the rolling blind rope or the pull rope handle can be suspended, providing a good user experience.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A pull-rod roller blind that can automatically descend, comprising: A roller blind controller for controlling the raising and lowering of a roller blind fabric, characterized in that the roller blind controller comprises a roller blind drum (3) and a first shell (1) and a second shell (2) arranged opposite to each other, the roller blind drum (3) being rotatably arranged between the first shell (1) and the second shell (2), the roller blind drum (3) being connected to the roller blind fabric, and the roller blind fabric is driven to be raised and lowered by the rotation of the roller blind drum (3), and a first limiting mechanism for limiting the rising position of the roller blind fabric is arranged on the first shell (1), so that the roller blind fabric has an upper limit position; The first limiting mechanism comprises a first screw rod (4) and a first rotating sleeve (5) threadedly sleeved on the first screw rod (4); the first screw rod (4) is fixedly connected to the first housing (1); the first rotating sleeve (5) is connected to the rolling curtain drum (3) and rotates synchronously with the rolling curtain drum (3); and a first limiting member (41) for limiting the first rotating sleeve (5) is provided at one end of the first screw rod (4).

2. The pull-rod type roller blind that can be automatically lowered as claimed in claim 1, characterized in that: The first limiting member (41) is arranged at one end of the first screw rod (4) away from the second shell (2); when the rolling curtain drum (3) rotates to drive the rolling curtain cloth to rise, the rolling curtain drum (3) drives the first rotating sleeve (5) to rotate, so that the first rotating sleeve (5) approaches the first limiting member (41); when the first rotating sleeve (5) abuts against the first limiting member (41), the limiting member is performed.

3. The pull-rod type roller blind capable of automatically descending as claimed in claim 2, characterized in that: A first limiting step (51) is provided on one side of the first rotating sleeve (5) close to the first limiting member (41), and a first limiting groove (411) corresponding to the first limiting step (51) is provided on the first limiting member (41).

4. The pull-rod type roller blind capable of automatically descending as claimed in claim 3, characterized in that: A plurality of the first limiting steps (51) are arranged in an annular manner at equal intervals, a first guiding bevel (511) is arranged on the first limiting step (51), and a second guiding bevel (412) corresponding to the first guiding bevel (511) is arranged at the first limiting groove (411).

5. The pull-rod type roller blind capable of automatically descending as claimed in claim 1, characterized in that: The first screw rod (4) is provided with a first external thread (42) for threading the first rotating sleeve (5), and one end of the first external thread (42) close to the first limiting member (41) is provided with a first pitch increasing thread (421), and the pitch of the first pitch increasing thread (421) is greater than the pitch of the first external thread (42).

6. The pull-rod type roller blind capable of automatically descending as claimed in claim 1, characterized in that: The second shell (2) is provided with a second limiting mechanism for limiting the descending position of the rolling blind cloth, so that the rolling blind cloth has a descending limit position, the second limiting mechanism comprises a second screw rod (6) and a second rotating sleeve (7) threadedly sleeved on the second screw rod (6), the second screw rod (6) is fixedly connected to the second shell (2), the second rotating sleeve (7) is connected to the rolling blind roller (3) and rotates synchronously with the rolling blind roller (3), and one end of the second screw rod (6) is provided with a second limiting member (61) for limiting the second rotating sleeve (7).

7. The pull-rod type roller blind capable of automatically descending as claimed in claim 6, characterized in that: The second limiting member (61) is arranged at an end of the second screw rod (6) away from the first housing (1); when the blind roller (3) rotates to drive the blind cloth to descend, the blind roller (3) drives the second rotating sleeve (7) to rotate, so that the second rotating sleeve (7) is close to the second limiting member (61); when the second rotating sleeve (7) abuts against the second limiting member (61), the second limiting member (7) is limited; a second limiting step (71) is arranged on a side of the second rotating sleeve (7) close to the second limiting member (61); and a second limiting step (71) corresponding to the second limiting step (71) is arranged on the second limiting member (61). The second limiting step (71) is provided with a plurality of equidistantly arranged ring-shaped portions, the second limiting step (71) is provided with a third guide bevel (711), the second limiting groove (611) is provided with a fourth guide bevel (612) corresponding to the third guide bevel (711), the second screw rod (6) is provided with a second external thread (62) for threading the second rotating sleeve (7), the second external thread (62) is provided with a second pitch increasing thread (621) at one end close to the second limiting member (61), and the pitch of the second pitch increasing thread (621) is greater than the pitch of the second external thread (62).

8. The pull-rod type roller blind capable of automatically descending as claimed in claim 6, characterized in that: The first screw rod (4), the second screw rod (6) and the rolling curtain cylinder (3) are coaxially arranged; when the rolling curtain cylinder (3) rotates to drive the rolling curtain portion to rise, the first rotating sleeve (5) and the second rotating sleeve (7) both move toward the first limiting member (41); when the rolling curtain cylinder (3) rotates to drive the rolling curtain portion to descend, the first rotating sleeve (5) and the second rotating sleeve (7) both move toward the second limiting member (61).

9. The pull-rod type roller blind capable of automatically descending as claimed in claim 6, characterized in that: The second shell (2) is provided with a locking and releasing mechanism for locking / releasing the height of the rolling curtain cloth. When the rolling curtain cloth rises to a required height, the rolling curtain cloth is locked by the locking and releasing mechanism. When the rolling curtain cloth needs to be lowered, the rolling curtain cloth is released by the locking and releasing mechanism, so that the rolling curtain cloth descends under the action of its own gravity. The locking and releasing mechanism comprises a fixed shaft (8) fixedly connected to the second shell (2), one end of the fixed shaft (8) away from the second shell (2) is fixedly connected to the second screw rod (6), a rotating seat (81) for connecting to the rolling curtain drum (3) is rotatably mounted on the fixed shaft (8), the rotating seat (81) rotates synchronously with the rolling curtain drum (3), and a sliding groove member (82) and a holding spring (83) are rotatably mounted on the fixed shaft (8), one end of the holding spring (83) is connected to the sliding groove member (82), and the sliding groove member (82) is connected to the holding spring (83) through the sliding groove member (82). 3) to achieve unidirectional rotation, the rotation direction of the slide member (82) is the same as the rotation direction of the rolling shutter drum (3) when it rises, two positioning beads (9) are arranged between the rotating seat (81) and the slide member (82), and the rotating seat (81) is provided with a horizontal slide (811) for the positioning beads (9) to slide horizontally; with the axis of the slide member (82) as the rotation center, the two positioning beads (9) are distributed at 90 degrees; the slide member (82) is provided with The first slideway (821) and the second slideway (822) are connected, and when the locking and releasing mechanism is locked, one of the positioning beads (9) slides to the first positioning portion (8211) of the first slideway (821); when the rolling curtain cloth rises, one of the positioning beads (9) slides to the second positioning portion (8212) of the first slideway (821); when the locking and releasing mechanism is released, both of the positioning beads (9) slide into the second slideway (822).

10. The pull-rod type roller blind capable of automatically descending as claimed in claim 9, characterized in that: The first shell (1) is provided with a pull rod handle (10) for driving the rolling curtain drum (3) to rotate and rise, the end of the first screw rod (4) away from the first shell (1) is connected to a reducer (11), and the second shell (2) includes a rotating adjustment plate (12) for adjusting the height of the lowering limit position of the rolling curtain cloth, and the rotating adjustment plate (12) is fixedly connected to the fixed shaft (8).

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