A pulley mechanism and heavy-duty lifting doors and windows

Abstract

This invention discloses a pulley mechanism and a heavy-duty lifting door / window. The heavy-duty lifting door / window includes a door / window body and a pulley mechanism. The pulley mechanism is connected to the door / window body and is used to support the door / window body. The pulley mechanism is configured at the non-horizontal end of the heavy-duty lifting door / window in the horizontal direction. The pulley mechanism includes a connector, a baffle, an elastic element, and a pulley assembly. One end of the elastic element is connected to the connector, and the other end is connected to the pulley assembly. In actual use, there are unavoidable dimensional errors in the slide rails of the pulley mechanism and the profiles of the door / window body. When the force height of the pulley mechanism changes, the elastic element can freely expand and contract. The pressure exerted by the elastic element on the pulley assembly never exceeds the maximum bearing capacity of the pulley. Under the action of the elastic element, the pulley mechanism in this invention will not be damaged when the force height changes, effectively extending the service life of the pulley mechanism and the heavy-duty lifting door / window.

Description

Technical Field

[0001] This invention relates to the field of building door and window technology, and in particular to a pulley mechanism and a heavy-duty lifting door and window. Background Technology

[0002] Sliding doors and windows have the advantages of not taking up indoor space, beautiful appearance, economical price, and good airtightness. With the improvement of people's quality of life and changes in aesthetic style, people have begun to pursue the maximization of visual space, and the types of sliding doors and windows have gradually become more diversified. Heavy-duty lifting doors and windows are one type of sliding doors and windows.

[0003] Heavy-duty lifting doors and windows typically have a heavy main body (i.e., door or window frame). Furthermore, the sliding tracks and the profiles of the main body of heavy-duty lifting doors and windows inevitably have dimensional errors during actual use. Over time, slight deformation occurs due to gravity, resulting in uneven space between the main body and the sliding tracks. When three or more sets of pulleys are used in the same heavy-duty lifting door or window, one set of pulleys will inevitably bear a greater load than the others. When the actual load exceeds the rated load of that pulley set, the pulley set will be damaged. The load will then transfer to other pulley sets, causing damage to those sets as well. This affects the normal use of the lifting doors and windows, severely shortens their lifespan, and creates a very poor user experience. Summary of the Invention

[0004] In order to overcome at least one of the defects described in the prior art, the present invention provides a pulley mechanism and a heavy-duty lifting door and window that can be uniformly stressed and elastically damped to adapt to uneven road conditions.

[0005] The technical solution adopted by this invention to solve its problem is:

[0006] In a first aspect, the present invention provides a pulley mechanism, comprising:

[0007] Connector, the connector being used to connect the profile to drive the movement of the main body of the door and window;

[0008] Baffles, the baffles being fixed in pairs at both ends of the connector;

[0009] A pulley assembly, which is clamped and movably connected to the two baffles;

[0010] An elastic element, one end of which is fixedly connected to the connector and the other end of which is fixedly connected to the pulley assembly;

[0011] When the pressure of the door / window body on the pulley assembly is greater than the initial tension of the elastic element, the elastic element is compressed, and the pulley assembly rotates relative to the baffle to balance the pressure of the door / window body.

[0012] With this configuration, when there are obstacles or protrusions in the slide rail where the pulley mechanism of this invention is located, most of the weight of the door and window body is applied to the pulley when the pulley passes over the obstacle or protrusion, resulting in greater pressure on the pulley and thus greater pressure. If the pressure is greater than the initial tension of the elastic element, the elastic element will deform, and the pulley assembly will rotate relative to the baffle to balance the pressure on each pulley, thereby reducing the pressure on a single pulley, preventing the pulley from jamming or being damaged, and extending the service life of the pulley. When the pulley returns from the obstacle or protrusion to the horizontal track (i.e., when the force height of the pulley changes), the pulley assembly vibrates, and the elastic element can extend and retract to absorb the energy of the vibration until the elastic element returns to its original shape, thereby achieving the effect of shock absorption and ensuring the operational stability of the pulley mechanism.

[0013] According to a preferred embodiment, it further includes a guide wheel, the guide wheel being provided with a fixing pin, the two ends of the fixing pin being fixed to the two baffles;

[0014] The pulley assembly is configured as two, each pulley comprising a pulley, the axes of the two pulleys being symmetrically arranged about the fixing pin.

[0015] With this configuration, the two pulley assemblies are located at both ends of the pulley mechanism. The elastic elements at both ends can play a role in shock absorption. When the force height of the pulley changes, the elastic elements can freely extend and retract to ensure that the force on each pulley is uniform.

[0016] According to a preferred embodiment, the pulley assembly further includes a base movably connected to the baffle.

[0017] With this design, when the base rotates under the action of the elastic element, the baffle remains horizontal, that is, the door and window body remains horizontal, maintaining the stability and aesthetics of the door and window body.

[0018] According to a preferred embodiment, one of the base and the baffle is provided with a protrusion, and the other is provided with a corresponding through hole, the protrusion passing through and being rotatably connected to the through hole.

[0019] Alternatively, a bearing can be installed between the protrusion and the through hole to reduce friction during the rotation of the base and the baffle, thus maintaining the stability of the movement.

[0020] According to a preferred embodiment, it further includes a support member, which is clamped between the two baffles for supporting the door and window body in the vertical direction;

[0021] The support member is provided with a guide groove, and the guide wheel is slidably connected to the guide groove.

[0022] According to a preferred embodiment, the pulley's axle is provided with a hub, the baffle is provided with a positioning hole, and the hub is provided and positioned in the positioning hole.

[0023] This design effectively prevents the pulley from shifting vertically relative to the baffle when subjected to the elastic force of the elastic element, thus preventing the pulley mechanism from moving unsteadily.

[0024] According to a preferred embodiment, the elastic element is configured as a return spring or a gas spring.

[0025] This configuration allows the initial tension of the elastic element to provide support for the connector in the vertical direction.

[0026] According to a preferred embodiment, the base is provided with a first fixing post, the connector is provided with a second fixing post, one end of the elastic member is fixedly connected to the first fixing post, and the other end is fixedly connected to the second fixing post.

[0027] According to a preferred embodiment, the connector is provided with a fixing groove for inserting and connecting with a brush.

[0028] With this configuration, when the pulley mechanism of the present invention slides along the slide rail, obstacles on the slide rail can be cleared in advance by the brush, reducing the probability of the pulley running over the obstacles.

[0029] Secondly, the present invention also provides a heavy-duty lifting door and window, including the pulley mechanism and the door and window body as described above. The pulley mechanism is connected to the door and window body for supporting the door and window body and for driving the door and window body to slide. The pulley mechanism is configured as a non-end pulley mechanism of the door and window body in the horizontal direction, and more preferably, it is configured as an intermediate pulley mechanism.

[0030] In summary, the pulley mechanism and heavy-duty lifting door / window provided by the present invention have at least the following technical effects:

[0031] The heavy-duty lifting door and window of the present invention includes a door / window body and a pulley mechanism. The pulley mechanism is connected to the door / window body, supports the door / window body, and can drive the door / window body to slide. The pulley mechanism is configured at the non-end of the heavy-duty lifting door / window in the horizontal direction. The pulley mechanism includes a connector, a baffle, an elastic element, and a pulley assembly. One end of the elastic element is fixedly connected to the connector, and the other end is fixedly connected to the pulley assembly. In actual use, there are unavoidable dimensional errors in the slide rails on which the pulley mechanism is installed and the profiles of the door / window body. When the force height of the pulley mechanism changes, the elastic element can freely expand and contract. The pressure of the elastic element on the pulley assembly never exceeds the maximum bearing capacity of the pulley. Under the action of the elastic element, the pulley mechanism in the present invention will not be damaged when the force space height changes, effectively extending the service life of the pulley mechanism and the heavy-duty lifting door / window.

[0032] On the other hand, when there are obstacles or protrusions in the slide rail where the pulley mechanism is located, most of the weight of the door and window body is applied to the pulley when the pulley passes over the obstacle or protrusion, resulting in greater pressure on the pulley. If the pressure is greater than the initial tension of the elastic element, the elastic element will deform, and the pulley assembly will rotate relative to the baffle to balance the pressure on each pulley, thereby reducing the pressure on a single pulley, making the pulley evenly stressed, balancing the pressure on the door and window body, and preventing the pulley from getting stuck or damaged. When the heavy lifting door changes state (from non-lifted to lifted or from lifted to non-lifted), the pulley assembly vibrates, and the elastic element can stretch and absorb the energy of the vibration until the elastic element returns to its original shape, thus achieving the effect of shock absorption. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the pulley mechanism in this embodiment;

[0034] Figure 2 for Figure 1 A three-dimensional structural diagram with one side panel removed;

[0035] Figure 3 for Figure 1 Explosion-proof three-dimensional structure diagram;

[0036] Figure 4 This is an exploded structural diagram of a portion of the structure in this embodiment;

[0037] Figure 5 This is a cross-sectional view of the pulley mechanism in this embodiment along the plane containing the vertical baffle.

[0038] The meanings of the reference numerals in the attached figures are as follows:

[0039] 1-Baffle; 11-Engaging hole; 12-Positioning hole; 13-Protruding shaft; 14-Fixing hole; 2-Supporting component; 21-Guide groove; 3-Pulley assembly; 31-Base; 311-Through hole; 312-First fixing post; 32-Pulley; 33-Hub; 34-Fixing sleeve; 4-Connecting component; 41-Insertion part; 42-Fixing groove; 43-Engaging block; 44-Second fixing post; 5-Elastic component; 6-Guide wheel; 61-Fixing pin. Detailed Implementation

[0040] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0041] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In the description of this invention, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the / described" object or "an" object are also intended to indicate one of a possible plurality of such objects.

[0043] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] Furthermore, in the description of this invention, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" are used to describe the angles shown in the accompanying drawings and should not be construed as limiting specific embodiments. It should also be understood that, in the context of an element or feature being connected "upper," "lower," "inner," or "outer" of another element (one or more), it can be directly connected to the other element (one or more) "upper," "lower," "inner," or "outer," or indirectly connected to the other element (one or more) "upper," "lower," "inner," or "outer" through an intermediate element.

[0045] Please see Figure 1 and Figure 2 This invention discloses a pulley mechanism, including a baffle 1, a support member 2, a pulley assembly 3, and a connector 4. The connector 4 is used to connect the profile to drive the door and window body (not shown in the figure) to move. The baffle 1 is fixed in pairs at both ends of the connector 4. The pulley assembly 3 is clamped and movably connected to the two baffles 1. The support member 2 is also clamped and disposed between the two baffles 1 to support the door and window body in the vertical direction. The number of connectors 4 is also configured as two, respectively disposed at both ends of the baffle 1 in the sliding direction of the pulley assembly 3, so as to ensure the stability of the overall movement of the pulley mechanism.

[0046] Furthermore, please refer to the following: Figure 3 The pulley mechanism in this embodiment also includes an elastic element 5, one end of which is fixedly connected to the connecting element 4, and the other end is fixedly connected to the pulley assembly 3; please refer to the following: Figure 4 and Figure 5The pulley assembly 3 includes a base 31 and a pulley 32, with the pulley 32 rotatably connected to the base 31. In this embodiment, the number of pulley assemblies 3 is configured as two. When the pulley mechanism in this embodiment is connected to the door / window body, the weight of the door / window body is converted into pressure on the support member 2. Since the support member 2 is movably connected to the baffle 1, the pressure on the support member 2 is transmitted to the baffle 1. The pulley assembly 3 is connected to the baffle 1, so the pulley assembly 3 also bears the pressure on the support member 2. When the pulley mechanism moves horizontally on the slide rail (not shown in the figure), the pressure of the door / window body on the pulley assembly 3 is equal to the initial tension of the elastic member 5. The elastic member 5 maintains its initial length, and the two pulley assemblies 3 are evenly stressed. When there is an obstacle in the slide rail where the pulley mechanism is located or the slide rail itself has a protrusion, the pulley... When the pulley 32 passes over an obstacle or protrusion, most of the weight of the door or window body is applied to the pulley 32, resulting in a large pressure on the pulley 32. If the pressure is greater than the initial tension of the elastic element 5, the elastic element 5 will deform, and the pulley assembly 3 will rotate relative to the baffle 1 to balance the pressure on each pulley 32, thereby reducing the pressure on a single pulley 32, preventing the pulley 32 from jamming or being damaged, and extending the service life of the pulley 32. When the pulley 32 returns to the horizontal track from the obstacle or protrusion (i.e., when the force height of the pulley 32 changes), the pulley assembly 3 vibrates. The elastic element 5 can extend and retract to absorb the energy of the vibration until the elastic element 5 returns to its original shape, thereby achieving the effect of shock absorption and ensuring the operational stability of the pulley mechanism.

[0047] Specifically, the pulley mechanism in this embodiment also includes a guide wheel 6. A guide groove 21 is provided on the support member 2, and the guide wheel 6 is slidably connected to the guide groove 21. A fixing pin 61 passes through the guide wheel 6. A fixing hole 14 is provided at a corresponding position on the baffle 1. Both ends of the fixing pin 61 are fixed to the fixing holes 14 on the two baffles 1. In this embodiment, the axes of the two pulleys 32 are symmetrically arranged about the fixing pin 61. It can be understood that the number of pulley assemblies 3 is not fixed. In this embodiment, one pair is used, but two or more pairs can also be used, as long as the elastic force of the elastic member 5 ensures that each pulley 32 is subjected to balanced force. Figure 2 As shown, Figure 2The guide wheel 6 is located at the upper part of the guide groove 21, that is, the fixing pin 61 and the baffle 1 connected to the guide wheel 6 are located at the upper part of the support member 2. At this time, the pulley mechanism is in an unlifted state. When the guide wheel 6 rolls obliquely downward along the guide groove 21, that is, the fixing pin 61 and the baffle 1 move obliquely downward relative to the support member 2 until the guide wheel 6 moves to the lowest point of the guide groove 21, the vertical distance between the upper surface of the support member 2 and the axis of the pulley 32 reaches its maximum. At this time, the pulley mechanism is in a lifted state. During the process of changing from a lifted state to a lifted state, or from a lifted state to an unlifted state, the force between the connecting member 4 and the pulley assembly 3 is dynamic. That is, the elastic force applied by the elastic member 5 to the connecting member 4 and the pulley assembly 3 is also dynamic. The elastic member 5 can freely extend and retract to absorb the energy of vibration, so as to achieve the effect of shock absorption and ensure the stability of the pulley mechanism during dynamic changes.

[0048] It is understood that the elastic element 5 of the present invention can be configured as a return spring or a gas spring. In this embodiment, a return spring is selected because it has a lower cost and its mechanical fatigue life is usually greater than that of a gas spring, thereby extending the overall service life of the pulley mechanism.

[0049] Furthermore, the connector 4 and the baffle 1 are connected by a snap-fit ​​connection. One of them is provided with a snap-fit ​​hole 11, and the other is provided with a snap-fit ​​block 43. The shape and size of the snap-fit ​​hole 11 and the snap-fit ​​block 43 are matched to realize the snap-fit ​​connection. In this embodiment, the snap-fit ​​hole 11 is provided at both ends of the baffle 1, and the snap-fit ​​block 43 is provided on the connector 4. Of course, the snap-fit ​​hole 11 can also be provided on the connector 4, and the snap-fit ​​block 43 can be provided on the baffle 1. As an optional implementation, the connector 4 and the baffle 1 can also be configured as a tenon and mortise connection. Such variations are all within the protection scope of this invention.

[0050] Specifically, please refer to Figure 3 and Figure 4 A hub 33 passes through the shaft of pulley 32. A positioning hole 12 is provided on baffle 1. The hub 33 passes through and is positioned in the positioning hole 12. A fixing sleeve 34 is also fitted at the end of the hub 33. The fixing sleeve 34 abuts against baffle 1 to further position the pulley 32 and prevent the pulley 32 from disengaging from the base 31 under repeated vibration during the repeated lifting and lowering process. On the other hand, one of the base 31 and baffle 1 is provided with a convex shaft 13, and the other is provided with a corresponding through hole 311. The convex shaft 13 passes through and is rotatably connected to the through hole 311. In this embodiment, the convex shaft 13 is provided on baffle 1 and the through hole 311 is provided on base 31. Of course, the convex shaft 13 can also be provided on base 31 and the through hole 311 can be provided on baffle 1. Such variations are all within the protection scope of this invention. More preferably, a bearing can be provided between the convex shaft 13 and the through hole 311 to reduce the friction during the rotation of base 31 and baffle 1 and maintain the stability of movement.

[0051] Furthermore, please refer to Figure 5 The base 31 is provided with a first fixing post 312, and the connector 4 is provided with a second fixing post 44. The terms "first" and "second" are only used to distinguish between the first fixing post 312 and the second fixing post 44, and do not imply any structural difference between them. One end of the elastic member 5 is fixedly connected to the first fixing post 312, and the other end is fixedly connected to the second fixing post 44. Figure 5 If there are obstacles or protrusions in the slide rail where the two pulleys 32 are located, when the pulley 32 passes over the obstacles or protrusions, most of the weight of the door / window body is applied to the pulley 32, resulting in greater pressure on the pulley 32 and thus greater pressure. Figure 5 Taking the left pulley 32 as an example, if the pressure on the pulley 32 is greater than the initial tension of the elastic element 5 when it passes an obstacle or protrusion, the base 31 rotates clockwise relative to the baffle 1. The elastic element 5 positioned on the base 31 is squeezed by the first fixed column 312 and the second fixed column 44, and the elastic element 5 deforms to balance the pressure on the left and right pulleys 32, thereby reducing the pressure on the left pulley 32, preventing the pulley 32 from jamming or being damaged, and extending the service life of the pulley 32.

[0052] This invention also provides a heavy-duty lifting door and window, including a door and window body and a pulley mechanism as described above. The pulley mechanism is connected to the door and window body, used to support the door and window body, and can drive the door and window body to slide. It can be understood that the heavy-duty lifting door and window of this embodiment includes at least three sets of pulley mechanisms. Each pulley is distinguished according to the sliding direction of the pulley mechanism, and there are front pulley mechanism, middle pulley mechanism and rear pulley mechanism in sequence. The pulley mechanism described above in this embodiment is usually used as the middle pulley mechanism. The middle pulley mechanism is not only located in the middle of the door and window body, but is located at a non-end. Due to the unavoidable dimensional errors in the sliding rail of the heavy-duty lifting door and window and the profile of the door and window body during actual use, and the slight deformation due to gravity after long-term use, the space between the door and window body and the sliding rail is not absolutely equal. When the force height of the pulley mechanism in this embodiment changes, the elastic element can freely expand and contract. The pressure of the elastic element on the pulley assembly never exceeds the maximum bearing capacity of the pulley. Under the action of the elastic element, the present invention... The pulley mechanism will not be damaged when the load-bearing space height changes, effectively extending the service life of the pulley mechanism and heavy-duty lifting doors and windows. On the other hand, the number of middle pulley mechanisms is not fixed according to the weight and size of the door and window body, and can be one or more. In the existing field of heavy-duty lifting doors, in order to increase the load-bearing capacity of the pulley mechanism, it is usually necessary to increase the size of the pulley 32, such as the diameter or axial thickness. In order to adapt to the large-sized pulley 32, the size of the profile of the part of the door and window body used to install the pulley 32 needs to be increased simultaneously. Relatively speaking, the size of the glass part of the door and window body becomes relatively smaller, affecting the aesthetics and increasing the manufacturing cost. Another way is to increase the number of pulleys, but this will increase the cost and assembly time. In this embodiment, the load-bearing capacity can be increased by increasing the number of middle pulley mechanisms without changing the size of the profiles, which is convenient for mass production. Moreover, for each additional pulley mechanism, the total load-bearing weight can be increased by 40%-50% on the basis of the original weight, without having to increase the number too much, thus saving costs.

[0053] In a preferred embodiment, the connecting member 4 of the pulley mechanism is provided with a plug-in part 41 and a fixing groove 42. The plug-in part 41 is used to connect the profile in the sliding direction of the pulley 32. That is, when multiple pulley mechanisms are provided, the profile can be plugged into the plug-in part 41 to add additional pulley mechanisms. The fixing groove 42 is used to plug into and connect with a brush (not shown in the figure). When the pulley mechanism slides along the slide rail, the brush can clean the obstacles on the slide rail in advance, reducing the probability of the pulley 32 running over the obstacles.

[0054] In summary, this embodiment discloses a heavy-duty lifting door and window, including a door and window body and a pulley mechanism. The pulley mechanism is connected to the door and window body to support it and drive it to slide. The pulley mechanism is located at the non-horizontal end of the heavy-duty lifting door and window. The pulley mechanism includes a connector 4, a baffle 1, an elastic element 5, and a pulley assembly 3. One end of the elastic element 5 is fixedly connected to the connector 4, and the other end is fixedly connected to the pulley assembly 3. In actual use, the slide rails for the pulley mechanism and the profiles of the door and window body have unavoidable dimensional errors. When the force height of the pulley mechanism changes, the elastic element 5 can freely extend and retract. The pressure exerted by the elastic element 5 on the pulley assembly 3 never exceeds the maximum bearing capacity of the pulley 32. Under the action of the elastic element 5, the pulley mechanism in this invention will not be damaged when the force height changes, effectively extending the lifespan of the pulley mechanism and the heavy-duty lifting door and window. On the one hand, it extends the service life of doors and windows; on the other hand, when there are obstacles in the slide rail where the pulley mechanism is located or there are protrusions in the slide rail itself, when the pulley 32 passes through the obstacle or protrusion, most of the weight of the door and window body is applied to the pulley 32, resulting in greater pressure on the pulley 32, and thus bearing greater pressure. If the pressure is greater than the initial tension of the elastic element 5, the elastic element 5 will deform, and the pulley assembly 3 will rotate relative to the baffle 1 to balance the pressure on each pulley 32, thereby reducing the pressure on a single pulley 32, so that the pulley 32 is evenly stressed, balancing the pressure on the door and window body, and preventing the pulley 32 from getting stuck or damaged. When the pulley 32 returns from the obstacle or protrusion to the horizontal track (i.e., when the force height of the pulley 32 changes), the pulley assembly 3 vibrates, and the elastic element 5 can stretch and absorb the energy of the vibration until the elastic element 5 returns to its original shape, so as to achieve the effect of shock absorption.

[0055] More preferably, compared to existing technologies that increase the load-bearing capacity of the pulley mechanism by increasing the size of the pulleys and widening the thickness and / or height of the profiles of the lifting doors and windows, the present invention can effectively increase the load-bearing capacity of the pulley mechanism by setting multiple pulley mechanisms at the non-ends of heavy-duty lifting doors, without increasing the size of the pulleys and profiles or adding a large number of pulleys. Each additional pulley mechanism can increase the total load-bearing weight by 40%-50% on the basis of the original weight.

[0056] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A heavy-duty lifting door and window, characterized in that, The system includes a pulley mechanism and a door / window body. The pulley mechanism is connected to the door / window body, supports the door / window body, and is capable of driving the door / window body to slide. The pulley mechanism is configured as a non-end pulley mechanism of the door / window body in the horizontal direction. The pulley mechanism includes: Connector (4), the connector (4) is used to connect the profile to drive the main body of the door and window to move; Baffles (1), which are fixed in pairs at both ends of the connector (4); A pulley assembly (3) is movably connected to the two baffles (1) in a clamping manner; An elastic element (5) is fixedly connected at one end to the connector (4) and at the other end to the pulley assembly (3); When the pressure of the door and window body on the pulley assembly (3) is greater than the initial tension of the elastic element (5), the elastic element (5) is compressed, and the pulley assembly (3) rotates relative to the baffle (1) to balance the pressure of the door and window body; The pulley assembly (3) also includes a base (31), which is movably connected to the baffle (1); The base (31) is provided with a first fixing post (312), the connector (4) is provided with a second fixing post (44), one end of the elastic member (5) is fixedly connected to the first fixing post (312), and the other end is fixedly connected to the second fixing post (44).

2. The heavy-duty lifting door and window according to claim 1, characterized in that: It also includes a guide wheel (6), which is provided with a fixing pin (61), and the two ends of the fixing pin (61) are fixed to the two baffles (1); The pulley assembly (3) is configured as two, the pulley assembly (3) includes pulleys (32), and the axes of the two pulleys (32) are symmetrically arranged about the fixing pin (61).

3. A heavy-duty lifting door and window according to claim 1, characterized in that: One of the base (31) and the baffle (1) is provided with a protrusion, and the other is provided with a corresponding through hole (311). The protrusion passes through and is rotatably connected to the through hole (311).

4. A heavy-duty lifting door and window according to claim 2, characterized in that: It also includes a support member (2), which is clamped between the two baffles (1) for supporting the main body of the door and window in the vertical direction; The support member (2) is provided with a guide groove (21), and the guide wheel (6) is slidably connected to the guide groove (21).

5. A heavy-duty lifting door and window according to claim 1, characterized in that: The pulley (32) has a hub (33) passing through its shaft, and the baffle (1) has a positioning hole (12). The hub (33) passes through and is positioned in the positioning hole (12).

6. A heavy-duty lifting door and window according to claim 1, characterized in that: The elastic element (5) is configured as a return spring or a gas spring.

7. A heavy-duty lifting door and window according to claim 1, characterized in that: The connector (4) is provided with a fixing groove (42), which is used for plugging and connecting with the brush.

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