Novel lifting pulley block and lifting door and window system

Abstract

The utility model discloses a novel lifting pulley block and a lifting door and window system, the lifting pulley block comprises a lifting support, a pulley assembly and a first transmission assembly, and the lifting support is provided with a sliding groove; the pulley assembly is provided with a guide shaft, and the guide shaft is arranged in the sliding groove in a penetrating mode and can slide along the sliding groove. When the pulley assembly is driven to ascend or descend, the door leaf can ascend or descend through cooperation of the guide shaft and the sliding groove. One end of the first transmission assembly is in transmission connection with the driver, and the other end is in transmission connection with the pulley assembly. The sliding groove is an arc groove which is arranged in a downward inclined mode, and the lowest terminal of the arc is slightly higher than the tangent point of the arc to form a clamping position. When the pulley assembly is driven to move until the guide shaft slides to the lowest terminal of the sliding groove, the guide shaft is stressed in a balanced manner and stops at the clamping position, so that the guide shaft is prevented from exerting acting force on the first transmission assembly and the driver to enable the first transmission assembly and the driver to be stressed by pulling force, the risk of damage is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of door and window hardware accessories, and in particular to a novel lifting pulley block and a lifting door and window system. Background Art

[0002] This section only provides background information related to the present application to help those skilled in the art understand the present application more thoroughly and accurately, and it is not necessarily prior art.

[0003] Existing lifting and sliding doors and windows utilize the principle of lever theory. By rotating the handle, the transmission bar is driven to slide, and then the lifting pulley assembly arranged at the bottom of the door leaf is driven to lift or lower, thereby realizing the lifting or sinking of the door leaf. Among them, the lifting pulley assembly is generally composed of a transmission assembly, a lifting bracket and a pulley assembly. The lifting bracket is generally fixed on the door leaf, and the lifting bracket and the pulley assembly are connected by an inclined groove guide shaft structure to realize sliding connection. The transmission assembly is used to drive the pulley assembly to move. Therefore, through the sliding cooperation of the inclined groove and the guide shaft, when the lifting bracket and the pulley assembly slide relative to each other, the distance between the lifting bracket and the pulley assembly in the vertical direction changes, thereby realizing the lifting and lowering of the door leaf.

[0004] However, the existing inclined groove is usually in the shape of a waist-shaped hole and is tilted downward. With this arrangement, when the guide shaft is driven to slide to the lowest end of the inclined groove, the guide shaft has a tendency to move toward the top of the inclined groove under the action of the gravity of the door leaf, that is, the transmission component and the transmission bar connected to the guide shaft will be subject to tension at all times, which may easily cause damage to the transmission component and the transmission bar in the long run, thereby reducing their service life. Utility Model Content

[0005] In order to overcome the defects of the above-mentioned prior art, the utility model provides a new lifting pulley block, by designing the slide groove to be a circular arc groove inclined downward, and the lowest end of the arc is higher than the intersection of the arc to form a locking position. When the guide shaft is driven to slide to the lowest end of the slide groove, the guide shaft is in a force balance state under the action of the gravity of the door leaf and stops at the locking position, thereby preventing the transmission assembly and the transmission from being always subjected to tension, thereby extending their service life.

[0006] The technical solution adopted by the utility model to solve the problem is:

[0007] A novel lifting pulley block comprises:

[0008] A lifting bracket is used to be installed at the bottom corner of the door leaf; a sliding groove is provided on the lifting bracket;

[0009] A pulley assembly is used to slide on the slide rail; the pulley assembly is provided with a guide shaft matching the slide groove, the guide shaft is inserted into the slide groove and can slide along the slide groove; when the pulley assembly is driven to perform a lifting or lowering action, the door leaf can be lifted or lowered by the cooperation between the guide shaft and the slide groove;

[0010] A first transmission assembly, one end of which is used for transmission connection with the transmission device, and the other end of which is used for transmission connection with the pulley assembly;

[0011] Wherein, the slide groove is an arc groove arranged to be inclined downward, and the lowest end of the arc is slightly higher than the arc intersection point to form a locking position; when the pulley assembly is driven to move until the guide shaft slides to the lowest end of the slide groove, the guide shaft is in a force balance state and stops at the locking position.

[0012] Furthermore, when the pulley assembly is driven to descend until the guide shaft slides to the lowest end of the slide slot, the door leaf completes the lifting action, and the pulley assembly contacts the slide rail, and the bottom of the lifting bracket is detached from the slide rail; when the pulley assembly is driven to rise until the guide shaft slides to the top of the slide slot, the door leaf completes the sinking action, and the bottom of the lifting bracket abuts against the slide rail, and the pulley assembly is detached from the slide rail.

[0013] Furthermore, it also includes a pulley rest block arranged at the bottom of the lifting bracket, wherein:

[0014] The pulley rest block comprises a main body that matches the shape of the slide rail and an inserting strip arranged on the main body, a plug hole is provided at the bottom of the lifting bracket, and the inserting strip is plugged and matched with the plug hole;

[0015] When the guide shaft slides to the topmost end of the slide groove, the main body contacts the slide rail.

[0016] Furthermore, the pulley rest block is made of nylon.

[0017] Furthermore, the lifting bracket is an L-shaped structure and includes a first bracket arranged horizontally and a second bracket arranged vertically, wherein:

[0018] The first bracket is provided with the sliding groove;

[0019] The first bracket and the second bracket are both provided with a plurality of mounting holes for fixing on the door leaf.

[0020] Further, the pulley assembly includes two fixing plates respectively arranged at the front and rear sides of the first bracket and two pulleys clamped and connected between the two fixing plates and arranged at intervals on the left and right, and the pulleys are used to slide on the slide rail;

[0021] The guide shaft is clamped and connected between the two fixing plates.

[0022] Furthermore, the pulley is a double-row ball bearing pulley, and the pulley is connected and fixed to the fixing plate via a fixing pin.

[0023] Further, the first transmission assembly includes a first connecting rod, an adapter and a second connecting rod, wherein:

[0024] The adapter is hinged to one end of the first connecting rod, the first bracket and one end of the second connecting rod respectively;

[0025] The first connecting rod is slidably mounted on the second bracket and the other end thereof is used for transmission connection with the transmission device;

[0026] The other end of the second connecting rod extends between the two fixing plates, and the second connecting rod is connected and fixed to the fixing plates via a fixing pin.

[0027] Furthermore, it also includes a plurality of latches, the adapter is hinged to one end of the first connecting rod through one of the latches, the adapter is hinged to the first bracket through one of the latches, and the adapter is hinged to one end of the second connecting rod through one of the latches.

[0028] In addition, the utility model also provides a lifting door and window system, including a door leaf, a handle assembly, a transmission, a slide rail and the above-mentioned new lifting pulley assembly, wherein:

[0029] The door leaf comprises a leaf body and a leaf frame, the handle assembly and the transmission are both mounted on the leaf frame; the handle assembly comprises a handle, the transmission comprises a second transmission assembly and a transmission bar, and the handle, the second transmission assembly and the transmission bar are sequentially connected in transmission;

[0030] The novel lifting pulley assembly is installed at the corner of the bottom of the fan frame through the lifting bracket, and the transmission bar is in transmission connection with the first transmission assembly, and the pulley assembly is used for sliding on the slide rail;

[0031] When the handle is rotated, the pulley assembly can be driven to perform lifting or lowering actions through the transmission cooperation of the second transmission assembly, the transmission bar and the first transmission assembly in sequence, thereby achieving lifting or sinking of the door leaf.

[0032] In summary, the utility model provides a new type of lifting pulley set and lifting door and window system, by designing the slide groove to be a circular arc groove inclined downward, and the lowest end of the arc is slightly higher than the arc intersection to form a locking position. In this way, when the guide shaft is driven to slide to the lowest end of the slide groove, the guide shaft is in a force balance state under the action of the gravity of the door leaf and stops at the locking position, thereby avoiding the first transmission assembly and the transmission device from being always subjected to tension, thereby reducing the risk of damage to components and increasing the service life of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is an explosion diagram of the lifting pulley of the utility model;

[0034] Figure 2 This is a structural schematic diagram of the lifting pulley block of the utility model;

[0035] Figure 3 It is a cross-sectional schematic diagram of the pulley assembly in the lifting pulley block of the utility model when it is in a lifting state;

[0036] Figure 4 It is a cross-sectional schematic diagram of the pulley assembly in the lifting pulley block of the utility model when it is in a sinking state;

[0037] Figure 5 It is an exploded schematic diagram of the lifting door and window system of the utility model;

[0038] Figure 6 This is a structural schematic diagram of the lifting door and window system of the utility model;

[0039] Figure 7 It is a partial structural schematic diagram of the lifting door and window system of the utility model when the door leaf is in a lowered state;

[0040] Figure 8 It is a partial structural schematic diagram of the lifting door and window system of the utility model when the door leaf is in a lifting state.

[0041] The meanings of the reference numerals are as follows:

[0042] 1. Lifting pulley block; 11. Lifting bracket; 111. First bracket; 1111. Slide groove; 1112. First hinge hole; 1113. Insert hole; 112. Second bracket; 12. Pulley assembly; 121. Fixing plate; 1211. First fixing hole; 1212. Second fixing hole; 1213. Third fixing hole; 1214. Fourth fixing hole; 122. Pulley; 123. Guide shaft; 124. Fixing pin; 13. First transmission assembly; 131. First connecting rod; 1311. Second hinge hole ; 132. Adapter; 1321. Third hinge hole; 1322. Fourth hinge hole; 1323. Fifth hinge hole; 133. Second connecting rod; 1331. Sixth hinge hole; 1332. Fifth fixing hole; 134. Latch; 14. Pulley rest block; 141. Main body; 142. Insert; 15. Connector; 151. Boss; 2. Door leaf; 21. Leaf body; 22. Leaf frame; 3. Handle assembly; 31. Handle; 4. Transmission; 5. Slide rail; 6. Rear lifting pulley block; 7. Connecting rod. DETAILED DESCRIPTION

[0043] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0046] Embodiment 1

[0047] See also Figure 1-4The utility model first provides a new type of lifting pulley group 1, including a lifting bracket 11, a pulley assembly 12 and a first transmission assembly 13. The lifting bracket 11 is installed at the bottom corner of the door leaf 2, and a slide groove 1111 is provided on the lifting bracket 11; the pulley assembly 12 is used to be slid on the slide rail 5, and the pulley assembly 12 is provided with a guide shaft 123 matching the slide groove 1111, and the guide shaft 123 is penetrated in the slide groove 1111 and can slide along the slide groove 1111; when the pulley assembly 12 is driven to perform lifting or lowering, the lifting or sinking of the door leaf 2 can be achieved through the cooperation of the guide shaft 123 and the slide groove 1111; one end of the first transmission assembly 13 is transmission-connected to the transmission device 4, and the other end thereof is transmission-connected to the pulley assembly 12, and the first transmission assembly 13 is used to drive the pulley assembly 12 to move.

[0048] Among them, the slide groove 1111 is an arc groove arranged to be inclined downward, and the lowest terminal of the arc is slightly higher than the intersection of the arc to form a locking position. With such arrangement, when the pulley assembly 12 is driven to sink toward the first transmission assembly 13 until the guide shaft 123 slides to the lowest terminal of the slide groove 1111, the guide shaft 123 is in a force balance state and stops at the locking position, that is, the guide shaft 123 does not apply any force to the first transmission assembly 13 and the transmission device 4, thereby avoiding the first transmission assembly 13 and the transmission device 4 from being subjected to tension at all times, thereby reducing the risk of damage to its components and extending its service life.

[0049] In addition, when the guide shaft 123 is driven to sink to the lowest end of the slide groove 1111, the door leaf 2 completes the lifting action, and the pulley assembly 12 contacts the slide rail 5, and the bottom of the lifting bracket 11 is separated from the slide rail 5. Figure 4 When the guide shaft 123 is driven to rise to the top of the slide groove 1111, the door leaf 2 completes the sinking action, and the bottom of the lifting bracket 11 abuts against the slide rail 5, and the pulley assembly 12 is separated from the slide rail 5, as shown Figure 3 shown.

[0050] Furthermore, the lifting bracket 11 is an L-shaped structure and includes a first bracket 111 arranged horizontally and a second bracket 112 arranged vertically. The first bracket 111 is provided with the above-mentioned slide groove 1111; and the first bracket 111 and the second bracket 112 are provided with a plurality of mounting holes for fixing on the door leaf 2. In addition, it also includes a pulley rest block 14 arranged at the bottom of the first bracket 111. The pulley rest block 14 includes a main body 141 adapted to the shape of the slide rail 5 and an insert strip 142 arranged on the main body 141. The bottom of the first bracket 111 is provided with an insert hole 1113, and the insert strip 142 is plugged and matched with the insert hole 1113 to achieve fixation. Therefore, when the guide shaft 123 is driven to rise to the top of the slide groove 1111, the main body 141 is in contact with the slide rail 5 at this time, and the door leaf 2 cannot be driven to move at this time, thereby improving the stability of the door leaf 2.

[0051] Preferably, the pulley rest block 14 is made of nylon, thereby increasing the contact friction between it and the slide rail 5 .

[0052] Furthermore, the pulley assembly 12 includes two fixing plates 121 disposed at the front and rear sides of the first bracket 111 and two pulleys 122 that are clamped and connected between the two fixing plates 121 and are spaced apart from each other. The pulley 122 is used to slide on the slide rail 5, and the guide shaft 123 is clamped and connected between the two fixing plates 121. Preferably, the pulley 122 is a double-row ball bearing pulley, and the pulley 122 is connected and fixed to the fixing plate 121 by a fixing pin 124.

[0053] Therefore, the pulley 122 made of double-row ball bearings can be further reduced in size while ensuring the same load-bearing capacity as the large-sized pulley 122, thereby narrowing the visible surface of the fan frame 22, making it more simple and elegant, thereby achieving a better visual effect.

[0054] In this embodiment, the fixing plate 121 is provided with a first fixing hole 1211 for cooperating and fixing with the end of the guide shaft 123 and a second fixing hole 1212 for cooperating and fixing with the end of the fixing pin 124 .

[0055] Furthermore, the first transmission assembly 13 includes a first connecting rod 131, an adapter 132 and a second connecting rod 133, the adapter 132 is hinged to one end of the first connecting rod 131, the first bracket 111 and one end of the second connecting rod 133 respectively; the other end of the first connecting rod 131 is used for transmission connection with the transmission device 4, and the first connecting rod 131 is slidably disposed on the second bracket 112; the other end of the second connecting rod 133 extends between the two fixed plates 121, and the second connecting rod 133 is connected and fixed to the fixed plate 121 by a fixing pin 124.

[0056] Therefore, when the first connecting rod 131 is driven to slide upward on the second bracket 112 through the transmission device 4, the adapter 132 can be driven to rotate, thereby driving the second connecting rod 133 and the fixed plate 121 to descend in the direction close to the first connecting rod 131, and simultaneously driving the pulley 122 and the guide shaft 123 to descend in the direction close to the first connecting rod 131 until the pulley 122 contacts the slide rail 5. At this time, the pulley 122 does not move, and the guide shaft 123 continues to descend and drives the door leaf 2 to rise by cooperating with the slide groove 1111 until the guide shaft 123 falls to the lowest terminal of the slide groove 1111. At this time, the door leaf 2 completes the lifting action, and the pulley rest block 14 is separated from the slide rail 5.

[0057] Similarly, when the first connecting rod 131 is driven to slide downward on the second bracket 112 through the transmission device 4, the adapter 132 can be driven to rotate in the opposite direction, thereby driving the second connecting rod 133 and the fixed plate 121 to be lifted in the direction away from the first connecting rod 131, and simultaneously driving the pulley 122 and the guide shaft 123 to be lifted in the direction away from the first connecting rod 131, and driving the door leaf 2 to sink through the cooperation between the guide shaft 123 and the slide groove 1111 until the pulley rest block 14 abuts against the slide rail 5, at which time the pulley 122 is driven to move and disengage from the slide rail 5 until the guide shaft 123 rises to the top of the slide groove 1111, at which time the door leaf 2 completes the sinking action.

[0058] In this embodiment, the first connecting rod 131 is provided with a second hinge hole 1311, the adapter 132 is provided with a third hinge hole 1321, and the two are connected by a latch 134 to achieve a hinged connection; the first bracket 111 is provided with a first hinge hole 1112, the adapter 132 is provided with a fourth hinge hole 1322, and the two are connected by a latch 134 to achieve a hinged connection; the second connecting rod 133 is provided with a sixth hinge hole 1331, the adapter 132 is provided with a fifth hinge hole 1323, and the two are connected by a latch 134 to achieve a hinged connection; the second connecting rod 133 is provided with a fifth fixing hole 1332, the fixing plate 121 is provided with a third fixing hole 1213, and the two are connected by a fixing pin 124 to achieve a fixed connection.

[0059] Furthermore, it also includes a connector 15 disposed at the other end of the pulley assembly 12, and the connector 15 is clamped and fixed between the two fixing plates 121; specifically, the front and rear sides of the connector 15 are provided with a boss 151, and the fixing plate 121 is provided with a fourth fixing hole 1214, and the boss 151 is inserted into the fourth fixing hole 1214 and clamped and fixed to achieve the connection between the two. Therefore, by providing the connector 15, the pulley assembly 12 can be connected to another pulley assembly 12 through the connector 15 to form a pulley mechanism, thereby further improving the support and bearing capacity of the door leaf 2.

[0060] Embodiment 2

[0061] See also Figure 5-8 The utility model also provides a lifting door and window system, including a door leaf 2, a handle assembly 3, a transmission 4, a slide rail 5 and a new lifting pulley group 1 of the first embodiment, the door leaf 2 includes a leaf body 21 and a leaf frame 22, the handle assembly 3 and the transmission 4 are both installed on the leaf frame 22, the handle assembly 3 includes a handle 31, the transmission 4 includes a second transmission assembly and a transmission bar, the handle 31, the second transmission assembly, the transmission bar and the first transmission assembly 13 are sequentially connected in transmission.

[0062] In addition, it also includes a rear lifting pulley block 6 arranged on the other side of the bottom of the door leaf 2. The lifting pulley block 1 and the rear lifting pulley block 6 are arranged at intervals on the left and right and are connected and fixed by a connecting rod 7.

[0063] Therefore, when the handle 31 is rotated, the pulley assembly 12 can be driven to perform lifting or lowering action through the transmission cooperation of the second transmission assembly, the transmission bar and the first transmission assembly 13 in sequence, thereby realizing the lifting or sinking of the door leaf 2.

[0064] In summary, the utility model provides a new type of lifting pulley group 1 and lifting door and window system, by designing the slide groove 1111 as a circular arc groove inclined downward, and the lowest terminal of the arc is slightly higher than the arc intersection to form a locking position. With such a configuration, when the guide shaft 123 is driven to slide to the lowest terminal of the slide groove 1111, the guide shaft 123 is in a force balance state under the action of the gravity of the door leaf 2 and stops at the locking position, thereby avoiding the first transmission component 13 and the transmission device 4 from being always subjected to tension, thereby reducing the risk of damage to components and increasing the service life of components.

[0065] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0066] It should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0067] In addition, in the description of the present utility model, "multiple" and "several" mean two or more than two, unless otherwise clearly and specifically defined.

[0068] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A new type of lifting pulley block, characterized in that: include: A lifting bracket is used to be installed at the bottom corner of the door leaf; a sliding groove is provided on the lifting bracket; A pulley assembly is used to slide on the slide rail; the pulley assembly is provided with a guide shaft matching the slide groove, the guide shaft is inserted into the slide groove and can slide along the slide groove; when the pulley assembly is driven to perform a lifting or lowering action, the door leaf can be lifted or lowered by the cooperation between the guide shaft and the slide groove; A first transmission assembly, one end of which is used for transmission connection with the transmission device, and the other end of which is used for transmission connection with the pulley assembly; Wherein, the slide groove is an arc groove arranged to be inclined downward, and the lowest end of the arc is slightly higher than the arc intersection point to form a locking position; when the pulley assembly is driven to move until the guide shaft slides to the lowest end of the slide groove, the guide shaft is in a force balance state and stops at the locking position.

2. The new lifting pulley block according to claim 1 is characterized in that: When the pulley assembly is driven to descend until the guide shaft slides to the lowest end of the slide slot, the door leaf completes the lifting action, the pulley assembly contacts the slide rail, and the bottom of the lifting bracket is separated from the slide rail; when the pulley assembly is driven to rise until the guide shaft slides to the top of the slide slot, the door leaf completes the sinking action, the bottom of the lifting bracket abuts against the slide rail, and the pulley assembly is separated from the slide rail.

3. The new lifting pulley block according to claim 2 is characterized in that: It also includes a pulley rest block arranged at the bottom of the lifting bracket, wherein: The pulley rest block comprises a main body that matches the shape of the slide rail and an inserting strip arranged on the main body, a plug hole is provided at the bottom of the lifting bracket, and the inserting strip is plugged and matched with the plug hole; When the guide shaft slides to the topmost end of the slide groove, the main body contacts the slide rail.

4. The new lifting pulley block according to claim 3 is characterized in that: The pulley rest block is made of nylon.

5. The new lifting pulley block according to any one of claims 1 to 4, characterized in that: The lifting bracket is an L-shaped structure and includes a first bracket arranged horizontally and a second bracket arranged vertically, wherein: The first bracket is provided with the sliding groove; The first bracket and the second bracket are both provided with a plurality of mounting holes for fixing on the door leaf.

6. The new lifting pulley block according to claim 5 is characterized in that: The pulley assembly comprises two fixing plates respectively arranged at the front and rear sides of the first bracket and two pulleys clamped and connected between the two fixing plates and arranged at intervals on the left and right sides, and the pulleys are used for sliding on the slide rail; The guide shaft is clamped and connected between the two fixing plates.

7. The new lifting pulley block according to claim 6 is characterized in that: The pulley is a double-row ball bearing pulley, and the pulley is connected and fixed to the fixing plate via a fixing pin.

8. The new lifting pulley block according to claim 6 is characterized in that: The first transmission assembly includes a first connecting rod, an adapter and a second connecting rod, wherein: The adapter is hinged to one end of the first connecting rod, the first bracket and one end of the second connecting rod respectively; The first connecting rod is slidably mounted on the second bracket and the other end of the first connecting rod is used for transmission connection with the transmission device; The other end of the second connecting rod extends between the two fixing plates, and the second connecting rod is connected and fixed to the fixing plates via a fixing pin.

9. The new lifting pulley block according to claim 8 is characterized in that: It also includes a plurality of latches, the adapter is hinged to one end of the first connecting rod through a latch, the adapter is hinged to the first bracket through a latch, and the adapter is hinged to one end of the second connecting rod through a latch.

10. A lifting door and window system, characterized in that: The invention comprises a door leaf, a handle assembly, a transmission, a slide rail and a new lifting pulley assembly according to any one of claims 1 to 9, wherein: The door leaf comprises a leaf body and a leaf frame, the handle assembly and the transmission are both mounted on the leaf frame; the handle assembly comprises a handle, the transmission comprises a second transmission assembly and a transmission bar, and the handle, the second transmission assembly and the transmission bar are sequentially connected in transmission; The novel lifting pulley assembly is installed at the corner of the bottom of the fan frame through the lifting bracket, and the transmission bar is in transmission connection with the first transmission assembly, and the pulley assembly is used for sliding on the slide rail; When the handle is rotated, the pulley assembly can be driven to perform lifting or lowering actions through the transmission cooperation of the second transmission assembly, the transmission bar and the first transmission assembly in sequence, thereby achieving lifting or sinking of the door leaf.

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