CN222315047U - Curtain and rolling curtain anti-falling device - Google Patents

Abstract

The utility model discloses a curtain and a rolling curtain anti-drop device thereof, wherein the rolling curtain anti-drop device comprises an anti-drop structure and a power structure, the power structure comprises a driving wheel and a shell, the driving wheel is rotationally connected to the shell, the driving wheel is used for meshing with a bead chain and driving the bead chain to rotate, the anti-drop structure comprises a clamping arm which is rotationally connected to the shell and is used for abutting the bead chain to the driving wheel, compared with the prior art, the clamping arm is rotationally connected to the shell and abuts the bead chain to the driving wheel, at least part of the bead chain always keeps a meshing state with the driving wheel under the abutting action of the clamping arm, and the problem of tooth drop of the bead chain is effectively solved. The curtain adopting the rolling curtain anti-drop device can prevent the bead chain from being separated from the power structure, and avoid that the power structure can not transmit power to the bead chain, thereby leading the bead chain to be unable to normally drive the curtain to open and close and affecting the normal use of the curtain.

Description

Curtain and rolling curtain anti-drop device thereof

Technical Field

The embodiment of the utility model relates to the technical field of electric curtains, in particular to a curtain and a rolling curtain anti-falling device thereof.

Background

Compared with the traditional manual curtain, the electric curtain has the advantages of convenience and quickness, a user can remotely control the opening and closing of the curtain without manually pulling the curtain, and great convenience is brought to the life of the user.

The current working principle of the electric curtain is that a driving motor transmits power to a bead chain through a driving wheel, the bead chain drives the curtain to open and close, but the circumference of the bead chain can be prolonged due to long-term tensile force of the bead chain, the bead chain and the driving wheel are tooth-removed, and the driving motor cannot transmit power to the bead chain, so that the electric curtain cannot work normally.

Disclosure of utility model

In view of the defects in the prior art, the utility model provides a curtain and a rolling curtain anti-disengaging device thereof, which can prevent a bead chain from being disengaged from a driving wheel.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The rolling curtain anti-falling device comprises an anti-falling structure and a power structure, wherein the anti-falling structure comprises a clamping arm, the power structure comprises a driving wheel and a shell, the driving wheel is rotationally connected to the shell and is used for meshing with a bead chain and driving the bead chain to rotate, the clamping arm is rotationally connected to the shell, and the clamping arm is used for propping the bead chain against the driving wheel.

As one embodiment, the number of the clamping arms is at least two, at least two clamping arms are arranged on two opposite sides of the driving wheel, or one clamping arm is arranged, and the clamping arms encircle the outer side of the driving wheel.

As one embodiment, the driving wheel is provided with a plurality of clamping grooves along the circumferential direction thereof, and the clamping grooves are used for being clamped with the bead chains.

As one embodiment, the clamping arm includes a connecting portion and a clamping portion connected to each other, the connecting portion is rotatably connected to the housing, and the clamping portion is bent and extended in a direction approaching the driving wheel.

As one embodiment, the clamping portion is provided with a protruding strip, the protruding strip is provided on one side of the clamping portion, which is close to the driving wheel, and the protruding strip is used for abutting the bead chain to the driving wheel.

As one implementation mode, the connecting part is provided with a convex column, the convex column is arranged on one side, close to the shell, of the connecting part, the shell is provided with a rotating groove, and the convex column is inserted into the rotating groove and is in rotating fit with the rotating groove.

As one embodiment, the rotating groove extends in a bending manner on the shell, and the convex column is inserted into the rotating groove and slides in the rotating groove.

As one implementation mode, the anti-falling structure comprises a rotating piece, a first mounting groove is formed in the shell, the rotating piece stretches into the first mounting groove and is connected with the shell, a second mounting groove is formed in the connecting portion, and the connecting portion is sleeved on the periphery of the rotating piece through the second mounting groove and is in running fit with the rotating piece.

As one embodiment, the anti-falling structure comprises a locking member, and the locking member passes through the first mounting groove and is connected with the rotating member so as to fix the rotating member with the housing.

As one implementation mode, the rotating piece comprises a rod body and a limiting part, the rod body stretches into the first mounting groove and is connected with the shell, the connecting part is sleeved on the periphery of the rod body through the second mounting groove and is in rotating fit with the rod body, the limiting part is connected with the rod body in a circumferential direction, and the limiting part is in abutting joint with the shell.

As one implementation mode, a limit groove is formed in one end, extending out of the second mounting groove, of the rotating piece, and the anti-falling structure comprises a clamping piece, wherein the clamping piece is inserted into the limit groove and is abutted to the connecting portion.

As one embodiment, the connecting portion includes a roller sleeve, and the roller sleeve is disposed on the outer periphery of the rotating member and is located in the second mounting groove.

As one embodiment, the anti-falling structure comprises an elastic piece, one side of the shell extends away from the clamping arm to form a protruding portion, one end of the elastic piece is elastically connected with the clamping arm, the other end of the elastic piece is wound on the protruding portion, and the elastic piece is used for pushing the clamping arm to rotate in a direction close to the driving wheel.

As one embodiment, when the clamping arm rotates in a direction away from the driving wheel, the clamping arm pushes the elastic element to move so as to enable the elastic element to be elastically deformed, and the elastic element pushes the clamping arm to rotate in a direction close to the driving wheel through elastic deformation.

Another object of the present utility model is to provide a window curtain, including a bead chain and a rolling shutter release preventing device according to any one of the above embodiments, where the bead chain is meshed with a driving wheel in the rolling shutter release preventing device, and the power structure in the rolling shutter release preventing device further includes a motor electrically connected to the driving wheel and used for driving the driving wheel to rotate.

The curtain and the rolling curtain anti-drop device have the beneficial effects that the curtain anti-drop device comprises the anti-drop structure and the power structure, the power structure comprises the driving wheel and the shell, the driving wheel is rotationally connected to the shell and is used for meshing with the bead chain and driving the bead chain to rotate, the anti-drop structure comprises the clamping arm which is rotationally connected to the shell and is used for abutting the bead chain to the driving wheel, compared with the prior art, the clamping arm is rotationally connected to the shell and abuts the bead chain to the driving wheel, at least part of the bead chain is always kept in a meshing state with the driving wheel under the abutting action of the clamping arm, and the problem of tooth drop of the bead chain is effectively solved. The curtain adopting the rolling curtain anti-drop device can prevent the bead chain from being separated from the power structure, and avoid that the power structure can not transmit power to the bead chain, thereby leading the bead chain to be unable to normally drive the curtain to open and close and affecting the normal use of the curtain.

Drawings

Fig. 1 shows a schematic structural view of a window covering according to an embodiment of the utility model;

FIG. 2 shows a schematic structural view of a roller shutter release preventing device according to an embodiment of the present utility model;

FIG. 3 is a schematic view showing the structure of a power structure in a roller shutter release preventing device according to an embodiment of the present utility model;

FIG. 4 shows an exploded view of a roller shutter release prevention device according to an embodiment of the present utility model;

FIG. 5 shows a schematic cross-sectional view of a roller shutter release prevention device according to an embodiment of the present utility model;

FIG. 6 is a schematic view showing a bottom structure of a roller shutter release preventing device according to an embodiment of the present utility model;

FIG. 7 shows another part explosion schematic of a roller shutter release prevention device according to an embodiment of the present utility model;

Fig. 8 shows another cross-sectional view of a roller shutter release preventing device according to an embodiment of the present utility model.

Reference numerals:

1. An anti-falling structure; 2, a power structure, 3, a bead chain, 11, a clamping arm, 12, an elastic piece, 13, a rotating piece, 14, a clamping piece, 15, a locking piece, 21, a shell, 22, a driving wheel, 111, a connecting part, 112, a clamping part, 113, a convex column, 114, a convex strip, 115, a second mounting groove, 116, a rolling sleeve, 131, a rod body, 132, a limiting groove, 133, a limiting part, 211, a first mounting groove, 212, a convex part, 213, a rotating groove, 221 and a clamping groove.

Detailed Description

In the present utility model, the terms "disposed," "provided," and "connected" are to be construed broadly. For example, they may be fixedly connected, detachably connected, or of unitary construction, they may be mechanically or electrically connected, they may be directly connected, or they may be indirectly connected through intermediaries, or they may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "radial," "circumferential," etc. refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present utility model will be understood by those of ordinary skill in the art according to the specific circumstances.

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1, an embodiment of the application provides a window curtain, which comprises a rolling shutter anti-falling device and a bead chain 3, wherein the rolling shutter anti-falling device comprises an anti-falling structure 1 and a power structure 2, the power structure 2 is connected with the bead chain 3, the power structure 2 is used for providing power for the bead chain 3 to rotate, the anti-falling structure 1 is respectively connected with the bead chain 3 and the power structure 2, and the anti-falling structure 1 is used for abutting the bead chain 3 to the power structure 2 so as to prevent the bead chain 3 from being separated from the power structure 2.

Specifically, referring to fig. 2, the power structure 2 includes a driving wheel 22 and a housing 21, the driving wheel 22 is rotatably connected to the housing 21, the driving wheel 22 is used for meshing with the bead chain 3 and driving the bead chain 3 to rotate, and the anti-drop structure 1 includes a clamping arm 11, wherein the clamping arm 11 is rotatably connected to the housing 21, and the clamping arm 11 is used for abutting the bead chain 3 to the driving wheel 22.

The power structure 2 further comprises a motor, the output end of the motor is connected with the driving wheel 22, the motor is used for driving the driving wheel 22 to rotate, the driving wheel 22 drives the bead chain 3 to rotate, the curtain further comprises a curtain fabric, the bead chain 3 rotates to drive the curtain fabric to open and close, and the opening and closing function of the electric curtain is achieved.

In one embodiment, the clamping arm 11 is rotatably connected to the housing 21 and abuts against the bead chain 3 and the driving wheel 22, when the long-term stressed perimeter of the bead chain 3 becomes longer, part of the bead chain 3 contacted with the clamping arm 11 still engages with the driving wheel 22 under the abutting action of the clamping arm 11, so that the driving wheel 22 can still drive the bead chain 3 to rotate when rotating. Compared with the prior art, the application has the advantages that the clamping arm 11 is arranged, at least part of the bead chains 3 are always in the meshed state with the driving wheel 22 under the abutting action of the clamping arm 11, the problem that the bead chains 3 are separated from teeth is effectively solved, the practicability of the device is improved, and the normal opening and closing functions of the curtain are ensured. The curtain adopting the rolling curtain anti-drop device can prevent the bead chain 3 from being separated from the power structure 2, and avoid that the power structure 2 can not transmit power to the bead chain 3, thereby leading the bead chain 3 to be unable to normally drive the curtain to open and close and influencing the normal use of the curtain.

Referring to fig. 3, the driving wheel 22 is provided with a plurality of clamping grooves 221 along the circumferential direction thereof, the clamping grooves 221 are used for being clamped with the bead chain 3, the plurality of clamping grooves 221 can enlarge the meshing range of the bead chain 3 and the driving wheel 22, the clamping arm 11 abuts against the bead chain 3 in the clamping grooves 221, the bead chain 3 is prevented from being separated from the clamping grooves 221, and the driving wheel 22 rotates to drive the bead chain 3 to rotate through the clamping action of the clamping grooves 221, so as to drive the curtain to open and close.

The number of the clamping arms 11 may be at least two, and at least two clamping arms 11 are provided on opposite sides of the driving wheel 22. The at least two clamping arms 11 respectively support the bead chain 3 in the clamping groove 221, so that the meshing range of the bead chain 3 and the driving wheel 22 is further enlarged, the driving wheel 22 is facilitated to drive the bead chain 3 to rotate, and the bead chain 3 and the driving wheel 22 are prevented from being separated.

In an alternative embodiment, the number of gripping arms 11 may be one, the gripping arms 11 embracing the outside of the driving wheel 22. If a clamping arm 11 is arranged, the clamping arm 11 is arranged along the outer side of the driving wheel 22 in a circumferential direction, the annular clamping arm 11 tightly holds the bead chain 3 and the driving wheel 22, and thus the arrangement can enlarge the meshing range of the bead chain 3 and the driving wheel 22, and is beneficial to the driving wheel 22 to drive the bead chain 3 to rotate.

Referring to fig. 4, the clamp arm 11 includes a connecting portion 111 and a clamp portion 112 connected to each other, the connecting portion 111 is rotatably connected to the housing 21, and the clamp portion 112 is bent and extended in a direction approaching the driving wheel 22.

In one embodiment, the clamping arm 11 is rotatably connected with the housing 21 through the connecting part 111, so that the clamping arm 11 can be prevented from obstructing the rotation of the bead chain 3, in particular, a plurality of beads are connected on the bead chain 3 in series, and the diameters of the plurality of beads possibly have certain difference. And the clamping part 112 of the clamping arm 11 is annularly arranged on the outer side of the driving wheel 22, so that the clamping part 112 is more attached to the outer side surface of the driving wheel 22, and the engagement range of the bead chain 3 and the driving wheel 22 is enlarged.

Referring again to fig. 4, the clamping portion 112 is provided with a protruding strip 114, the protruding strip 114 is disposed on one side of the clamping portion 112 near the driving wheel 22, and the protruding strip 114 is used for abutting the bead chain 3 against the driving wheel 22.

In one embodiment, the protruding strip 114 extends towards the direction close to the driving wheel 22, so that at least part of the protruding strip 114 can extend into the driving wheel 22, the protruding strip 114 abuts the bead chain 3 against the clamping groove 221, the connection stability of the bead chain 3 and the clamping groove 221 is enhanced, and the bead chain 3 is further prevented from falling out of the clamping groove 221.

Referring to fig. 5 and 6, the anti-disengaging structure 1 includes an elastic member 12, one side of the housing 21 extends away from the clamping arm 11 to form a protruding portion 212, one end of the elastic member 12 is elastically connected to the clamping arm 11, the other end is wound around the protruding portion 212, and the elastic member 12 is used for pushing the clamping arm 11 to rotate in a direction approaching to the driving wheel 22.

In one embodiment, in order to enhance the abutting effect of the clamping arm 11, the application is provided with the elastic member 12, the elastic member 12 is respectively and elastically connected with the clamping arm 11 and the shell 21, when the clamping arm 11 is jacked up, that is, the clamping arm 11 rotates in a direction away from the driving wheel 22, the clamping arm 11 is pushed to rotate in a direction close to the driving wheel 22 by the restoring elastic force of the elastic member 12, so that the bead chain 3 and the clamping groove 221 are abutted again, and the practicability of the device is improved. Wherein the elastic member 12 may employ a torsion spring.

In some other embodiments, the clamping arm 11 may be made of an elastic material, and the elastic force of the clamping arm 11 itself pushes the clamping arm 11 to rotate in a direction approaching to the driving wheel 22, which may also enhance the abutting effect of the clamping arm 11.

Specifically, when the clamp arm 11 rotates in a direction away from the driving wheel 22, the clamp arm 11 pushes the elastic member 12 to move, so that the elastic member 12 is elastically deformed, and the elastic member 12 pushes the clamp arm 11 to rotate in a direction approaching the driving wheel 22 through the elastic deformation.

In practical application, one end of the elastic member 12 is connected with the clamping arm 11, and the other end is connected with the housing 21, preferably, the elastic member 12 adopts a torsion spring, when the clamping arm 11 rotates in a direction away from the driving wheel 22, the clamping arm 11 drives the elastic member 12 to twist, so that the elastic member is elastically deformed, torsion energy is stored, and when the rotation of the clamping arm 11 stops, the elastic member 12 starts to release the torsion energy, so that the elastic member 12 returns to an untwisted state, and therefore, the elastic member 12 generates a reverse torque, and the torque pushes the clamping arm 11 to rotate in a direction close to the driving wheel 22, so that the bead chain 3 is abutted against the driving wheel 22 again.

Referring to fig. 6 and 7, the connecting portion 111 is provided with a protrusion 113, the protrusion 113 is disposed on a side of the connecting portion 111 near the housing 21, the housing 21 is provided with a rotation groove 213, and the protrusion 113 is inserted into the rotation groove 213 and is in rotation fit with the rotation groove 213.

In one embodiment, the protruding column 113 is connected to one side of the connecting portion 111 near the housing 21 and is in running fit with the rotating groove 213 on the housing 21, one end of the elastic member 12 is connected to the protruding portion 212, the other end is connected to the protruding column 113, when the clamping arm 11 is pushed open, the protruding column 113 follows the clamping arm 11 to rotate in the rotating groove 213 and drives the elastic member 12 to twist, so that the elastic member stores torsion energy, the elastic member 12 releases the torsion energy to realize the reset function of the clamping arm 11, and the protruding column 113 provides the connecting portion for the elastic member 12, so that the structure is simpler and the assembly is more convenient.

Referring again to fig. 7, the rotation groove 213 is bent and extended on the housing 21, and the boss 113 is inserted into the rotation groove 213 and slides in the rotation groove 213. The rotating groove 213 is bent and extended to a certain length on the shell 21, the convex column 113 rotates in the rotating groove 213, the rotating groove 213 with a certain length plays a limiting role on the convex column 113, the rotating angle of the convex column 113 is limited, the overlarge rotating angle of the convex column 113 is avoided, the torsion angle of the elastic piece 12 is caused to exceed the elastic limit of the elastic piece, the elastic piece 12 is permanently deformed and cannot be recovered, and the normal function of the device is affected.

Referring to fig. 7 and 8, the anti-falling structure 1 includes a rotating member 13, a housing 21 is provided with a first mounting groove 211, the rotating member 13 extends into the first mounting groove 211 and is connected with the housing 21, a connecting portion 111 is provided with a second mounting groove 115, and the connecting portion 111 is sleeved on the periphery of the rotating member 13 through the second mounting groove 115 and is in running fit with the rotating member 13.

In one embodiment, the rotating member 13 may be inserted into the first mounting groove 211 of the housing 21, and then the connecting portion 111 is sleeved on the rotating member 13, so as to complete the rotating connection between the clamping arm 11 and the housing 21, which makes the assembly of the apparatus simpler and more convenient.

The connecting portion 111 further includes a roller 116, and the roller 116 is sleeved on the outer circumference of the rotating member 13 and is located in the second mounting groove 115.

Specifically, the rotating member 13 is inserted into the first mounting groove 211 of the housing 21, the roller 116 is placed in the second mounting groove 115, the roller 116 and the connecting portion 111 are sleeved on the outer periphery of the rotating member 13, and the clamping arm 11 and the housing 21 are rotatably mounted, and the roller 116 can reduce abrasion of the clamping arm 11 relative to the rotating member 13 during rotation, so that the mechanical life of the clamping arm 11 is prolonged.

Referring again to fig. 8, the anti-disengagement structure 1 further includes a locking member 15, where the locking member 15 passes through the first mounting groove 211 and is connected to the rotating member 13, so that the rotating member 13 is fixed to the housing 21.

In one embodiment, the rotating member 13 is inserted into the first mounting groove 211 from above the housing 21, the locking member 15 extends into the first mounting groove 211 from below the housing 21 and is connected with the rotating member 13, so that the rotating member 13 is fixedly connected with the housing 21, then the connecting part 111 is sleeved on the rotating member 13, the connecting part 111 can rotate relative to the rotating member 13 to realize the rotating connection of the clamping arm 11 and the housing 21, and by arranging the locking member 15, the rotating member 13 is prevented from being separated from the housing 21, the clamping arm 11 is prevented from being separated from the housing 21, and the connecting stability of the clamping arm 11 and the housing 21 is enhanced. The locking member 15 may be a screw or a rivet.

Referring to fig. 8 again, the rotating member 13 includes a rod 131 and a limiting portion 133, the rod 131 extends into the first mounting groove 211 and is connected with the housing 21, the connecting portion 111 is sleeved on the outer periphery of the rod 131 through the second mounting groove 115 and is in rotational fit with the rod 131, the limiting portion 133 is annularly connected to the rod 131, and the limiting portion 133 is abutted to the housing 21.

In practical application, in order to further limit the axial movement of the rotating member 13 relative to the housing 21, the present application provides a limiting portion 133 on the rotating member 13, the limiting portion 133 is connected to the circumferential side of the rod 131 in a circumferential direction, when the rod 131 is inserted into the first mounting groove 211, the limiting portion 133 is located above the housing 21 and abuts against the housing 21 to limit the axial downward movement of the rod 131 relative to the housing 21, and the locking member 15 extends into the first mounting groove 211 from below the housing 21 and is connected to the rotating member 13 to limit the axial upward movement of the rod 131 relative to the housing 21, so that the limiting portion 133 and the locking member 15 limit the axial movement of the rotating member 13 relative to the housing 21 to prevent the rotating member 13 from being separated from the housing 21, thereby preventing the clamping arm 11 from being separated from the housing 21.

The end of the rotating member 13 extending out of the second mounting groove 115 is provided with a limiting groove 132, and the anti-disengaging structure 1 includes a clamping member 14, where the clamping member 14 is inserted into the limiting groove 132 and abuts against the connecting portion 111.

In one embodiment, the end of the rotating member 13 extending out of the second mounting groove 115 is provided with a circumferential limit groove 132, the clamping member 14 is inserted into the limit groove 132, and the clamping member 14 limits and constrains the clamping arm 11 axially, so as to prevent the clamping arm 11 from separating from the rotating member 13, and enhance the connection stability of the clamping arm 11 and the housing 21. Preferably, the clamping member 14 may be an E-clip spring.

Compared with the prior art, the embodiment of the application provides a curtain and a rolling curtain anti-falling device thereof, wherein the rolling curtain anti-falling device comprises an anti-falling structure 1 and a power structure 2, the power structure 2 comprises a driving wheel 22 and a shell 21, the driving wheel 22 is rotationally connected with the shell 21, the driving wheel 22 is used for being meshed with a bead chain 3 and driving the bead chain 3 to rotate, the anti-falling structure 1 comprises a clamping arm 11, the clamping arm 11 is rotationally connected with the shell 21, the clamping arm 11 is used for abutting the bead chain 3 with the driving wheel 22, compared with the prior art, the clamping arm 11 is rotationally connected with the shell 21 and abuts the bead chain 3 with the driving wheel 22, at least part of the bead chain 3 is always kept meshed with the driving wheel 22 under the abutting action of the clamping arm 11, and the problem of tooth falling of the bead chain 3 is effectively solved. The curtain adopting the rolling curtain anti-drop device can prevent the bead chain 3 from being separated from the power structure 2, and avoid that the power structure 2 can not transmit power to the bead chain 3, thereby leading the bead chain 3 to be unable to normally drive the curtain to open and close and influencing the normal use of the curtain.

The foregoing is merely illustrative of the embodiments of this application and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the application, and it is intended to cover all modifications and variations as fall within the scope of the application.

Claims (15)

1. A roller shutter release preventing device, comprising:

an anti-falling structure (1) comprises a clamping arm (11);

The power structure (2) comprises a driving wheel (22) and a shell (21), wherein the driving wheel (22) is rotatably connected with the shell (21), and the driving wheel (22) is used for being meshed with the bead chain (3) and driving the bead chain (3) to rotate;

The clamping arm (11) is rotatably connected to the shell (21), and the clamping arm (11) is used for abutting the bead chain (3) to the driving wheel (22).

2. The roller shutter release preventing device according to claim 1, wherein the number of the holding arms (11) is at least two, at least two of the holding arms (11) are provided on opposite sides of the driving wheel (22), or

The number of the clamping arms (11) is one, and the clamping arms (11) encircle the outer side of the driving wheel (22).

3. The roller shutter anti-drop device according to claim 1, characterized in that the driving wheel (22) is provided with a plurality of clamping grooves (221) along the circumferential direction thereof, and the clamping grooves (221) are used for being clamped with the bead chains (3).

4. The roller shutter release preventing device according to claim 1, wherein the grip arm (11) includes a connecting portion (111) and a grip portion (112) connected to each other, the connecting portion (111) is rotatably connected to the housing (21), and the grip portion (112) is curved and extended in a direction approaching the driving wheel (22).

5. The roller shutter release preventing device according to claim 4, wherein the clamping portion (112) is provided with a protruding strip (114), the protruding strip (114) is provided on a side of the clamping portion (112) close to the driving wheel (22), and the protruding strip (114) is used for abutting the bead chain (3) to the driving wheel (22).

6. The roller shutter release preventing device according to claim 4, wherein the connecting portion (111) is provided with a protruding column (113), the protruding column (113) is arranged on one side of the connecting portion (111) close to the housing (21), the housing (21) is provided with a rotating groove (213), and the protruding column (113) is inserted into the rotating groove (213) and is in rotating fit with the rotating groove (213).

7. The rolling shutter release preventing device according to claim 6, wherein the rotation groove (213) is curved to extend on the housing (21), and the boss (113) is inserted into the rotation groove (213) and slides in the rotation groove (213).

8. The roller shutter anti-drop device according to claim 4, wherein the anti-drop structure (1) comprises a rotating member (13), the housing (21) is provided with a first mounting groove (211), the rotating member (13) extends into the first mounting groove (211) and is connected with the housing (21), the connecting portion (111) is provided with a second mounting groove (115), and the connecting portion (111) is sleeved on the periphery of the rotating member (13) through the second mounting groove (115) and is in running fit with the rotating member (13).

9. The rolling shutter release preventing device according to claim 8, wherein the release preventing structure (1) includes a locking member (15), and the locking member (15) passes through the first mounting groove (211) and is connected with the rotating member (13) so as to fix the rotating member (13) with the housing (21).

10. The roller shutter anti-drop device according to claim 8, wherein the rotating member (13) comprises a rod body (131) and a limiting portion (133), the rod body (131) extends into the first mounting groove (211) and is connected with the housing (21), the connecting portion (111) is sleeved on the periphery of the rod body (131) through the second mounting groove (115) and is in running fit with the rod body (131), the limiting portion (133) is connected to the rod body (131) in a circumferential direction, and the limiting portion (133) is abutted to the housing (21).

11. The rolling shutter release preventing device according to claim 8, wherein a limiting groove (132) is formed in one end of the rotating member (13) extending out of the second mounting groove (115), the release preventing structure (1) comprises a clamping member (14), and the clamping member (14) is inserted into the limiting groove (132) and is abutted to the connecting portion (111).

12. The roller shutter release preventing device according to claim 8, wherein the connecting portion (111) is provided with a roller sleeve (116), and the roller sleeve (116) is sleeved on the outer periphery of the rotating member (13) and is located in the second mounting groove (115).

13. The rolling shutter release preventing device according to claim 1, wherein the release preventing structure (1) comprises an elastic member (12), one side of the housing (21) extends away from the clamping arm (11) to form a protruding portion (212), one end of the elastic member (12) is elastically connected with the clamping arm (11), the other end of the elastic member is wound around the protruding portion (212), and the elastic member (12) is used for pushing the clamping arm (11) to rotate towards a direction close to the driving wheel (22).

14. The roll screen anti-slip device according to claim 13, characterized in that when the grip arm (11) rotates in a direction away from the driving wheel (22), the grip arm (11) pushes the elastic member (12) to move so as to elastically deform the elastic member (12), and the elastic member (12) pushes the grip arm (11) to rotate in a direction approaching the driving wheel (22) by elastic deformation.

15. A window covering, characterized by comprising a bead chain (3) and a roller shutter anti-drop device according to any of the preceding claims 1-14, wherein the bead chain (3) is engaged with a driving wheel (22) in the roller shutter anti-drop device, and the power structure (2) in the roller shutter anti-drop device further comprises a motor, which is electrically connected with the driving wheel (22) and is used for driving the driving wheel (22) to rotate.