Venetian blind folding and unfolding balance mechanism and blind window

Abstract

The invention discloses a venetian blind folding and unfolding balance mechanism and a shutter, and relates to the technical field of door and window structures, the venetian blind folding and unfolding balance mechanism comprises a window frame and a strip rod of a venetian blind, two parallel driving shaft units are rotatably installed in the window frame, and two parallel transmission belts are in transmission connection between the two driving shaft units; the two parallel transmission belts are arranged on the window frame, the two ends of the rod body of the long-strip rod are perpendicularly connected with the corresponding transmission belts through the correction assemblies respectively, the transmission belts are synchronously driven through the two parallel driving shaft units, and therefore the two ends of the rod body of the long-strip rod are connected with the corresponding transmission belts correspondingly. Therefore, the stress uniformity degree of the two ends of the rod body of the long-strip rod in the movement process is increased, the blades can be kept in a balanced state in the movement process, the situation that the blades are blocked and even bent and damaged in the movement process is greatly reduced, and the stability of the shutter blind in the opening and closing movement process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of door and window structures, and in particular to a venetian blind retracting and extending balancing mechanism and a venetian blind. Background Art

[0002] The blinds are mainly composed of blinds and a window body, which are respectively provided with a blade angle adjustment mechanism for adjusting light and a retracting and releasing mechanism for changing the position of the blades on the window body, so that the posture of the blinds can be adjusted according to the actual needs of the user;

[0003] The existing Chinese patent publication number is "CN212898257U", the name of the patent is "Venetian blinds", and the patent includes "a shell base, a curtain body, a blade angle adjustment device and a first pull rope. The curtain body is arranged below the shell base and includes a plurality of blades and a lower end portion, and the blade angle adjustment device includes a rotating shaft group and a ladder rope group, the rotating shaft group is arranged in the shell base, and the ladder rope group includes at least two ladder ropes connected to the rotating shaft group and driven by the rotating shaft group to drive the blades to rotate";

[0004] The venetian blind includes blades and long rods arranged parallel to the blades. The position of the blades is changed by pulling or releasing ropes connected to the two ends of the long rods. However, the above scheme has the disadvantage that it is easy for the ropes at both ends of the long rods to be pulled or released inconsistently, resulting in the blades being tilted and pulled during movement. Moreover, as the pulling error of the rope accumulates, the blades of the venetian blind are prone to jamming or even bending and damage. Summary of the invention

[0005] The object of the present invention is to provide a venetian blind retracting and extending balancing mechanism and a venetian blind to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A venetian blind retraction and extension balance mechanism comprises a window frame and a long strip of venetian blinds, wherein two parallel drive shaft units are rotatably installed in the window frame, two parallel drive belts are connected for transmission between the two drive shaft units, and both ends of the rod body of the long strip are respectively connected perpendicularly to the corresponding drive belts.

[0008] Preferably, the driving shaft unit comprises a shaft rod rotatably connected to the window frame, and a belt reel adapted for transmission with a corresponding transmission belt is coaxially fixed on the rod body of the shaft rod.

[0009] Preferably, a correction assembly is provided at each end of the long rod, and the correction assembly includes a accommodating cavity located inside the long rod, an axial rod is rotatably installed in the accommodating cavity, a through opening is provided on the long rod for the transmission belt to pass through the accommodating cavity, and a roller is coaxially fixed on the axial rod and is in transmission contact with the transmission belt.

[0010] Preferably, a torsion rod parallel to the long strip rod is rotatably installed inside the window frame. The torsion rod and the shaft rod are drivingly connected by a plurality of ladder rope groups, and the movement of the ladder rope groups can drive the blades of the louver curtain to deflect.

[0011] Preferably, a first magnetic strip is fixed on the rod body of the long strip rod, and a second magnetic strip magnetically adsorbed to the first magnetic strip is fixed on the window frame. When the louver curtain is fully unfolded, the first magnetic strip and the second magnetic strip are magnetically fixed to each other.

[0012] Preferably, the transmission belt includes a belt body, and the head and tail ends of the belt body form a closed ring structure through connecting heads.

[0013] Preferably, fixed pulleys in contact with the belt body are provided on both sides of the belt pulley, and the wheel bodies of the fixed pulleys are rotatably installed on the wall surface of the accommodation cavity.

[0014] Preferably, a track structure is formed on the frame body of the window frame, and a plurality of sliding piece units are slidably installed on the track structure. Each sliding piece unit is fixedly corresponding to the blade of the louver curtain.

[0015] Preferably, the shaft rod includes a sleeve rotatably installed in the accommodation cavity. A first bevel gear is rotatably installed on the inner wall surface of the sleeve. Rods are rotatably inserted at both ends of the sleeve. A second bevel gear meshing with the first bevel gear is fixed at the end of each rod, and the roller is coaxially fixed with the rod.

[0016] Preferably, the above-mentioned louver curtain retracting and extending balance mechanism is provided on the louver window.

[0017] In the above technical solution, a louver curtain retracting and extending balance mechanism provided by the present invention increases the evenness of the forces on both ends of the rod body of the long strip rod during movement by arranging two parallel transmission belts on the window frame, vertically connecting both ends of the rod body of the long strip rod to the corresponding transmission belts respectively, and synchronously driving the transmission belts by two parallel drive shaft units, which is beneficial to maintaining the balance state during the movement of the blades, thereby greatly reducing the situation of jamming or even bending and damage of the blades during movement, and improving the stability of the louver curtain during the opening and closing movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0019] Figure 1Schematic cross-sectional view of the window frame of a balance mechanism for retracting and extending a louver curtain according to the present invention;

[0020] Figure 2 According to the present invention Figure 1 Enlarged view of location A in;

[0021] Figure 3 Schematic diagram of the long bar of a balance mechanism for retracting and extending a louver curtain according to the present invention;

[0022] Figure 4 According to the present invention Figure 3 Cross-sectional schematic view at B-B in;

[0023] Figure 5 Schematic diagram of the driving contact between the transmission belt and the roller of a balance mechanism for retracting and extending a louver curtain according to the present invention;

[0024] Figure 6 Schematic diagram of the transmission belt of a balance mechanism for retracting and extending a louver curtain according to the present invention;

[0025] Figure 7 Schematic diagram of the sliding fit between the sliding piece and the track structure of a balance mechanism for retracting and extending a louver curtain according to the present invention;

[0026] Figure 8 Schematic structural diagram of the elastic meshing tooth structure of a balance mechanism for retracting and extending a louver curtain according to the present invention;

[0027] Figure 9 Schematic diagram of the window frame of a balance mechanism for retracting and extending a louver curtain according to the present invention being a straight face frame;

[0028] Figure 10 Schematic diagram of the window frame of a balance mechanism for retracting and extending a louver curtain according to the present invention being a curved face frame.

[0029] Explanation of reference numerals:

[0030] 1, window frame; 2, long bar; 3, drive shaft unit; 3.1, shaft rod; 3.2, belt pulley; 3.21, outer disc ring; 3.22, inner disc body; 3.23, elastic meshing tooth structure; 3.231, insertion hole; 3.232, pin rod; 3.233, spring; 3.234, V-shaped groove; 4, transmission belt; 4.1, belt body; 4.2, connection head; 5, calibration component; 5.1, accommodation cavity; 5.2, shaft rod; 5.21, sleeve; 5.22, first bevel gear; 5.23, rod; 5.24, second bevel gear; 5.3, through hole; 5.4, roller; 6, torsion bar; 7, ladder rope group; 8, first magnetic strip; 9, second magnetic strip; 10, fixed pulley; 11, track structure; 12, sliding piece unit; 13, notch. Detailed implementation manners

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] See also Figure 1-10 The embodiment of the present invention provides a venetian blind retracting and releasing balancing mechanism, comprising a window frame 1 and a long bar 2 of the venetian blind, wherein two parallel drive shaft units 3 are rotatably installed in the window frame 1, and two parallel drive belts 4 are connected between the two drive shaft units 3, and the two ends of the rod body of the long bar 2 are respectively connected to the corresponding drive belts 4 in a perpendicular manner;

[0033] Specifically, the window frame 1 is a rectangular frame, the venetian blind is an existing blind structure, the venetian blind includes a plurality of long strip blades, the plurality of blades are fixed in series through a ladder rope group 7, one end of the ladder rope group 7 is fixed to the long bar 2, two drive shaft units 3 are close to the corresponding window frame 1, the two drive shaft units 3 rotate synchronously in the same direction and at the same speed, the transmission belt 4 is a long strip belt body, and the two transmission belts 4 are symmetrically distributed about the center position of the long bar 2;

[0034] During actual use, the drive shaft unit 3 rotates axially, thereby driving the two transmission belts 4 to move synchronously. At this time, under the connecting action of the correction component 5, the long rod 2 can move smoothly along the movement direction of the transmission belt 4. During the whole process, the two drive shaft units 3 make the same movement, thereby ensuring that the movement state of the two transmission belts 4 is consistent, so that the long rod 2 fixed to the two transmission belts 4 through the correction component 5 always maintains a stable state during the movement. The uniformity of force on the long rod 2 during the movement is improved, which is beneficial to maintaining a balanced state during the movement of the blades, thereby greatly reducing the occurrence of jamming or even bending damage during the movement of the blades, and improving the stability of the blinds during the opening and closing movement.

[0035] In another embodiment provided by the present invention, the drive shaft unit 3 includes a shaft rod 3.1 rotatably connected to the window frame 1, a belt reel 3.2 adapted for transmission with the corresponding transmission belt 4 is coaxially fixed on the rod body of the shaft rod 3.1, one of the shaft rods 3.1 is transmission-connected to a driving mechanism, which can be a driving motor, and a transmission friction force exists between the belt reel 3.2 and the transmission belt 4;

[0036] In the actual use process, when the driving unit 3 rotates forward, that is, the shaft rod 3.1 drives another one to rotate forward synchronously with the shaft rod 3.1 through two parallel belts 4 arranged side by side. At this time, the long strip rod 2 moves forward on the window frame 1, so that the forward moving long strip rod 2 drives the shutter to unfold on the window frame 1. Similarly, when the driving unit 3 rotates backward, that is, the shaft rod 3.1 drives another one to rotate backward synchronously with the shaft rod 3.1 through two parallel belts 4 arranged side by side. At this time, the long strip rod 2 moves backward on the window frame 1, so that the backward moving long strip rod 2 drives the shutter to retract on the window frame 1. In the whole process, the unfolding and retracting of the shutter on the window frame 1 can be realized by changing the rotation direction of the driving unit 3, and the operation is simple and convenient.

[0037] Another embodiment provided by the present invention is that correction components 5 are respectively arranged at both ends of the long strip rod 2. The correction component 5 includes a receiving cavity 5.1 located inside the long strip rod 2. The receiving cavity 5.1 is a long columnar cavity whose axis coincides with the axis of the long strip rod 2. A shaft rod 5.2 is rotatably installed in the receiving cavity 5.1. The axis of the shaft rod 5.2 coincides with the axis of the long strip rod 2. The shaft rod 5.2 is a hexagonal prism rod with a regular hexagonal cross section. Through holes 5.3 for the belt 4 to penetrate the receiving cavity 5.1 are opened on the long strip rod 2. There are two groups of through holes 5.3, which are respectively close to the side regions at both ends of the long strip rod 2. A roller 5.4 in transmission contact with the belt 4 is coaxially fixed on the shaft rod 5.2. There is a transmission friction force between the roller 5.4 and the belt 4.

[0038] It should be particularly noted that both of the two parallel belts 4 have an inner ring wall surface and an outer ring wall surface. The positions of the two parallel belts 4 on the window frame 1 are the first region and the second region respectively. That is to say, the window frame 1 has two symmetrically arranged regional positions. One of the regional positions is provided with a belt 4, and the other regional position is also provided with a belt 4. The belts 4 in the two regional positions are parallel to each other. The two ends of the shaft rod 5.2 are respectively located in the first region and the second region. Among them, the roller 5.4 at one end of the shaft rod 5.2 is in contact transmission with the inner ring wall surface of the belt 4 in the first region, and the roller 5.4 at the other end of the shaft rod 5.2 is in contact transmission with the outer ring wall surface of the belt 4 in the second region.

[0039] In the normal state, the included angle between the axis line of the long strip rod 2 and the moving track line is perpendicular. The specific situation of the driving belt 4 driving the long strip rod 2 to move forward through the correction assembly 5 is that since rollers 5.4 are fixed at both ends of the shaft rod 5.2, and the positions where the rollers 5.4 at both ends of the shaft rod 5.2 contact the corresponding driving belt 4 are different. Therefore, when the two driving belts 4 in the first region and the second region move forward synchronously, at this time, the driving belt 4 in the first region exerts a clockwise torsional force on the roller 5.4, while the driving belt 4 in the second region exerts a counterclockwise torsional force on the roller 5.4. The resultant force of the two is the same as the moving direction of the driving belt 4. Thus, under the static friction force of the driving belt 4 in the first region and the driving belt 4 in the second region, the roller 5.4 drives the long strip rod 2 to move forward along with the driving belt 4, and then the shutter expands on the window frame 1 along with the forward movement of the long strip rod 2;

[0040] Similarly, when the two driving belts 4 in the first region and the second region move backward synchronously, the shutter retracts on the window frame 1 along with the backward movement of the long strip rod 2;

[0041] In addition, when the included angle between the axis line of the long strip rod 2 and the moving track line is in a non-perpendicular state, the rod body of the long strip rod 2 is in a skew state. For example, during the forward movement of the skew long strip rod 2, when the inclined end of the skew long strip rod 2 contacts the window frame 1, the contact end is blocked by the window frame 1 and no longer moves along with the corresponding driving belt 4;

[0042] At this time, since there is a driving friction force between the roller 5.4 and the driving belt 4 in this region. For example, this region is the first region. Therefore, as the driving belt 4 in the first region continues to move forward, the roller 5.4 drives the shaft rod 5.2 to rotate forward correspondingly in the accommodating cavity 5.1, so that the roller 5.4 in the second region also rotates coaxially. Also, since the roller 5.4 in the first region contacts and drives the inner wall surface of the loop of the driving belt 4, and the roller 5.4 in the second region contacts and drives the outer wall surface of the loop of the driving belt 4, the roller 5.4 in the second region rolls in the same direction as the movement direction of the driving belt 4 in the second region when contacting the corresponding driving belt 4, so that the skew long strip rod 2 is restored to the normal state, enabling the long strip rod 2 to have a self-balancing effect during the movement on the window frame 1 and achieving multiple calibration effects on the state of the long strip rod 2.

[0043] Another embodiment provided by the present invention, the calibration assembly 5 includes a receiving cavity 5.1 located inside the long strip rod 2. A shaft rod 5.2 is rotatably installed in the receiving cavity 5.1. A through hole 5.3 for the transmission belt 4 to penetrate through the receiving cavity 5.1 is opened on the long strip rod 2. A roller 5.4 in transmission contact with the transmission belt 4 is coaxially fixed on the shaft rod 5.2. The roller 5.4 can be selected as a toothed roller structure. The transmission belt 4 includes a belt body 4.1. The head and tail ends of the belt body 4.1 are formed into a closed annular structure through a connector 4.2. The two parallel and juxtaposed transmission belts 4 both have an inner ring wall surface and an outer ring wall surface. Both of the two rollers 5.4 are in contact with the inner ring wall surface of the transmission belt 4, or both of the two rollers 5.4 are in contact with the outer ring wall surface of the transmission belt 4;

[0044] Furthermore, the shaft rod 5.2 includes a sleeve 5.21 rotatably installed in the receiving cavity 5.1. A first bevel gear 5.22 is rotatably installed on the inner wall surface of the sleeve 5.21. A rod 5.23 is rotatably inserted at each end of the sleeve 5.21. A second bevel gear 5.24 meshing with the first bevel gear 5.22 is fixed at the end of each rod 5.23. The roller 5.4 is coaxially fixed with the rod 5.23;

[0045] A notch 13 for the ladder rope group 7 to movably penetrate through is opened on the side of the receiving cavity 5.1. In addition, a torsion rod 6 parallel to the long strip rod 2 is rotatably installed in the window frame 1. The torsion rod 6 is in transmission connection with the shaft rod 5.2 through a plurality of ladder rope groups 7. The movement of the ladder rope group 7 can drive the blades of the venetian blind to deflect. Specifically, each ladder rope group 7 is fixedly connected to the sleeve 5.21 of the shaft rod 5.2;

[0046] In addition, a first magnetic strip 8 is fixed on the rod body of the long strip rod 2, and a second magnetic strip 9 magnetically adsorbed to the first magnetic strip 8 is fixed on the window frame 1. When the venetian blind is fully unfolded, the first magnetic strip 8 and the second magnetic strip 9 are magnetically fixed to each other;

[0047] And the deflection range of the ladder rope group 7 is limited and it cannot rotate continuously in the same direction. The shaft rod 5.2 is in transmission connection with the torsion rod 6 through a plurality of ladder rope groups 7, resulting in the limited rotation angle of the shaft rod 5.2. The shaft rod 5.2 can only reciprocally deflect within a certain range. The roller 5.4 is coaxially fixed with the shaft rod 5.2. Therefore, the roller 5.4 can also only reciprocally deflect within a certain range. For example, when the roller 5.4 deflects forward to the maximum forward position, it will no longer continue to rotate. Similarly, when the roller 5.4 deflects backward to the maximum backward position, it will no longer continue to rotate;

[0048] During the actual use process, the specific principle of the long strip rod 2 moving on the window frame 1 through the calibration component 5 is as follows: For example, the rotating roller 5.4 is at the forward maximum position. When the shaft rod 3.1 drives another shaft rod that rotates synchronously and forward through two parallel belts 4 arranged side by side, the part 4.1 of the belt 4 close to the long strip rod 2 also moves forward;

[0049] During the forward movement of the belt part 4.1, due to the transmission friction between the rotating roller 5.4 and the belt 4, and at this time the rotation of the rotating roller 5.4 at the forward maximum position is restricted, the rotating roller 5.4 cannot accept the static friction of the belt 4 and rotate in the accommodation cavity 5.1. Therefore, under the drive of the static friction of the belt 4, the rotating roller 5.4 drives the long strip rod 2 to move forward along with the belt 4 through the shaft rod 5.2. Furthermore, the venetian blind moves forward along with the long strip rod 2 and unfolds on the window frame 1;

[0050] When the venetian blind is in the fully unfolded state, at this time the long strip rod 2 is flush and fitted with the edge of the window frame 1. At this time, the first magnetic strip 8 on the rod body of the long strip rod 2 is magnetically adsorbed to the second magnetic strip 9 on the window frame 1, thereby increasing the stability of the long strip rod 2 on the window frame 1, and further continuously maintaining the fully unfolded state of the venetian blind;

[0051] When the venetian blind is in the fully unfolded state, at this time the shaft rod 3.1 drives another shaft rod that rotates synchronously and reversely through two parallel belts 4 arranged side by side. Since the first magnetic strip 8 on the rod body of the long strip rod 2 is magnetically adsorbed to the second magnetic strip 9 on the window frame 1, the reverse movement of the long strip rod 2 is hindered by pulling. During this process, the part 4.1 of the belt 4 close to the long strip rod 2 still moves reversely. Due to the transmission friction between the rotating roller 5.4 and the belt 4, during this reverse movement, the rotating roller 5.4 rotates from the forward maximum position towards the reverse maximum position. And through the transmission of the shaft rod 5.2 and the shaft rod 5.2, the blade angle of the venetian blind can be deflected, realizing the adjustment of the blade angle of the venetian blind, and the light transmittance can be adjusted according to requirements;

[0052] When the rotating roller 5.4 reaches the reverse maximum position from the forward maximum position, the connector 4.2 on the transmission belt 4 also reaches the side of the long strip rod 2. The diameter value of the connector 4.2 is greater than the diameter value of the through port 5.3, and the connector 4.2 cannot pass through the through port 5.3. At this time, if the shaft rod 3.1 continues to drive another shaft rod that rotates synchronously and reversely with the shaft rod 3.1 through the two parallel transmission belts 4, the connector 4.2 on the transmission belt 4 will exert a thrust on the reverse movement of the long strip rod 2, thereby overcoming the magnetic adsorption force between the first magnetic strip 8 on the rod body of the long strip rod 2 and the second magnetic strip 9 on the window frame 1, so that the long strip rod 2 moves reversely with the transmission belt 4, and then the venetian blind moves reversely with the long strip rod 2 and closes on the window frame 1;

[0053] In addition, during the movement of the long strip rod 2 on the window frame 1 through the calibration assembly 5, in the normal state of the long strip rod 2, the included angle between the axis line of the long strip rod 2 and the movement track line is in a vertical state. If the included angle between the axis line of the long strip rod 2 and the movement track line is in a non-vertical state, at this time the long strip rod 2 is in a skew state. During the forward movement of the skew long strip rod 2, when the inclined end of the skew long strip rod 2 contacts the window frame 1, the contact end of the long strip rod 2 is blocked by the window frame 1 and no longer moves with the corresponding transmission belt 4, and the rotating roller 5.4 near the contact end rotates in the accommodation cavity 5.1 under the friction force of the transmission belt 4, thereby driving the coaxially fixed rod 5.23 to rotate coaxially. Then, under the meshing transmission of the first bevel gear 5.22 and the second bevel gear 5.24, the rotating roller 5.4 far from the contact end rotates in the opposite direction to the rotating roller 5.4 near the contact end, so that the rotating roller 5.4 far from the contact end rolls on the corresponding conveyor belt 4, thereby accelerating the long strip rod 2 to recover from the skew state to the normal state;

[0054] That is to say, by only changing the rotation direction of the shaft rod 3.1, the unfolding, closing of the venetian blind and the angle adjustment of the blades of the venetian blind can be realized. The whole process is simple and convenient to operate. In addition, during the movement of the long strip rod 2 on the window frame 1, it also has a calibration function of self-balancing recovery, which has a multiple calibration effect on the state of the long strip rod 2 and can realize timely automatic calibration adjustment when the long strip rod 2 is skewed.

[0055] In another embodiment provided by the present invention, fixed pulleys 10 in contact with the belt body 4.1 are provided on both sides of the belt pulley 3.2. The wheel bodies of the fixed pulleys 10 are rotatably installed on the wall surface of the accommodation cavity 5.1. The axis line of the fixed pulley 10 is parallel to the axis line of the rotating roller 5.4, and the fixed pulley 10 can increase the contact area between the belt body 4.1 and the rotating roller 5.4.

[0056] Another embodiment provided by the present invention is that a track structure 11 is formed on the frame body of the window frame 1, and a plurality of sliding blade units 12 are slidably mounted on the track structure 11. Each sliding blade unit 12 is fixedly corresponding to a blade of the louver curtain. The frame body of the window frame 1 can be a curved frame or a straight frame. When the window frame 1 is a straight frame, it can be arranged horizontally or vertically. When the window frame 1 is arranged horizontally, at this time the louver curtain is also arranged horizontally on the window frame 1. At this time, each sliding blade unit 12 is fixedly corresponding to the top end of the blade of the louver curtain, so that the louver curtain can be suspended on the horizontally arranged window frame 1, facilitating the unfolding and retraction of the louver curtain.

[0057] Another embodiment provided by the present invention is that the belt pulley 3.2 includes an outer disk ring 3.21 that is drivingly adapted to the transmission belt 4. An inner disk body 3.22 fixed to the shaft rod 3.1 is adapted inside the outer disk ring 3.21. The inner disk body 3.22 and the outer disk ring 3.21 are drivingly engaged with each other through an elastic meshing tooth structure 3.23.

[0058] Specifically, the elastic meshing tooth structure 3.23 includes a plurality of insertion holes 3.231 formed on the circumferential surface of the inner disk body 3.22. A pin rod 3.232 is inserted and fitted in each insertion hole 3.231. One end of the pin rod 3.232 extends out of the outside of the insertion hole 3.231, and the other end of the pin rod 3.232 is elastically connected to the bottom of the insertion hole 3.231 through a spring 3.233. Each pin rod 3.232 forms a ring tooth structure on the circumferential surface of the inner disk body 3.22. A plurality of continuously distributed V-shaped grooves 3.234 are formed on the inner wall surface of the outer disk ring 3.21.

[0059] In actual use, under the elastic action of the spring 3.233, the protruding pin rod 3.232 is engaged with the corresponding V-shaped groove 3.234, thereby realizing the power transmission between the inner disk body 3.22 and the outer disk ring 3.21. When the transmission resistance between the inner disk body 3.22 and the outer disk ring 3.21 is too large, the V-shaped groove 3.234 generates a component force along the axis of the pin rod 3.232, and the pin rod 3.232 moves towards the inside of the insertion hole 3.231, causing the spring 3.233 to be compressed, so that the inner disk body 3.22 and the outer disk ring 3.21 rotate relative to each other, thereby playing a role of torque overload protection.

[0060] Another embodiment provided by the present invention is that the above-mentioned louver curtain retracting and balancing mechanism is provided on the louver window. Thus, by only changing the rotation direction of the shaft rod 3.1, the unfolding, retraction of the louver curtain and the angle adjustment of the blades of the louver curtain can be realized. The whole process is simple and convenient to operate. In addition, the long strip rod 2 also has a self-balancing recovery correction effect during the movement on the window frame 1, and has a multiple calibration effect on the state of the long strip rod 2, and can realize timely automatic correction adjustment when the long strip rod 2 is skewed. In addition, it can also play a role of shaft rotation torque overload protection for the shaft rod 3.1.

[0061] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, various different ways can be used to modify the described embodiments without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A balancing mechanism for retracting and releasing a venetian blind, comprising a window frame (1) and a long bar (2) of the venetian blind, characterized in that: Two parallel drive shaft units (3) are rotatably mounted in the window frame (1), two parallel drive belts (4) are connected for transmission between the two drive shaft units (3), and both ends of the rod body of the long rod (2) are respectively connected perpendicularly to the corresponding drive belt (4).

2. A Venetian blind retracting and extending balancing mechanism according to claim 1, characterized in that: The drive shaft unit (3) comprises a shaft rod (3.1) rotatably connected to the window frame (1), and a belt reel (3.2) adapted for transmission with a corresponding transmission belt (4) is coaxially fixed on the rod body of the shaft rod (3.1).

3. The balancing mechanism for retracting and extending a venetian blind according to claim 1, characterized in that: A correction assembly (5) is provided at each end of the long bar (2), the correction assembly (5) comprising a receiving chamber (5.1) located inside the long bar (2), an axial rod (5.2) being rotatably mounted in the receiving chamber (5.1), a through opening (5.3) for a transmission belt (4) to pass through the receiving chamber (5.1) is provided on the long bar (2), and a rotating roller (5.4) which is in transmission contact with the transmission belt (4) is coaxially fixed on the axial rod (5.2).

4. A venetian blind retracting and extending balancing mechanism according to claim 3, characterized in that: A torsion rod (6) parallel to the long rod (2) is rotatably mounted in the window frame (1); the torsion rod (6) is transmission-connected to the shaft rod (5.2) via a plurality of ladder rope groups (7); the movement of the ladder rope groups (7) can drive the blades of the venetian blind to deflect.

5. The venetian blind retracting and extending balancing mechanism according to claim 4, characterized in that: A first magnetic strip (8) is fixed on the rod body of the long rod (2), and a second magnetic strip (9) magnetically attracted to the first magnetic strip (8) is fixed on the window frame (1); when the venetian blind is fully unfolded, the first magnetic strip (8) and the second magnetic strip (9) are magnetically attracted and fixed to each other.

6. A venetian blind retracting and extending balancing mechanism according to claim 5, characterized in that: The transmission belt (4) comprises a belt body (4.1), and the belt body (4.1) is connected at both ends thereof to form a closed ring structure via a connecting head (4.2).

7. A Venetian blind retracting and extending balancing mechanism according to claim 6, characterized in that: A fixed pulley (10) in contact with the belt body (4.1) is provided on both sides of the belt reel (3.2), and the wheel body of each fixed pulley (10) is rotatably mounted on the wall surface of the accommodating cavity (5.1).

8. The venetian blind retracting and extending balancing mechanism according to claim 7, characterized in that: A track structure (11) is provided on the frame body of the window frame (1), and a plurality of sliding plate units (12) are slidably mounted on the track structure (11), and each of the sliding plate units (12) is fixed in one-to-one correspondence with a blade of a venetian blind.

9. The venetian blind retracting and extending balancing mechanism according to claim 3, characterized in that: The shaft rod (5.2) comprises a sleeve (5.21) rotatably mounted in the accommodating cavity (5.1); a first bevel tooth (5.22) is rotatably mounted on the inner wall surface of the sleeve (5.21); rods (5.23) are rotatably inserted at both ends of the sleeve (5.21); a second bevel tooth (5.24) meshing with the first bevel tooth (5.22) is fixed at the end of each rod (5.23); and the rotating roller (5.4) is coaxially fixed to the rod (5.23).

10. A shutter, characterized in that: The venetian blind is provided with a venetian blind retraction and extension balancing mechanism as described in any one of claims 1 to 9.

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