Rotary door closer with buffering function and side-hung door and window

Abstract

The invention relates to the technical field of door and window accessories, in particular to a rotary door closer with a buffering function and a side-hung door and window, the door closer comprises a mounting seat, a swing arm, a rotating shaft, a door closing spring and a buffering wheel, the swing arm is fixedly connected with the rotating shaft in the circumferential direction and hinged to the mounting seat through the rotating shaft, and one end of the door closing spring is fixed; the rotating shaft is provided with a shifting piece, the buffering wheel is hinged to the mounting base and is in damping connection with the mounting base, and the buffering wheel is provided with a first buffering tooth and a second buffering tooth which form a certain included angle in the circumferential direction of the buffering wheel; when the rotating shaft positively and negatively rotates to the first set angle and the second set angle, the first buffering teeth and the second buffering teeth can be correspondingly stirred through the stirring piece to drive the buffering wheel to rotate, damping force can be applied to the door and window sash for buffering when the door and window sash is closed or opened to the set angle, buffering cannot be conducted at other opening angles, and the buffering effect is good. Doors and windows can be effectively protected, and the use experience is improved.

Description

Technical Field

[0001] This invention relates to the field of door and window accessories technology, specifically a rotary door closer with a buffer function and a casement door and window. Background Technology

[0002] Currently, fireproof doors and windows, as well as some high-end shopping mall and residential doors and windows, are equipped with door closers to achieve automatic closing of door or window sashes (hereinafter referred to as door and window sashes). Existing door closers are usually hydraulic cylinder or pneumatic cylinder driven door closers, using the hydraulic cylinder or pneumatic cylinder to drive the piston rod to automatically close the door or window sash. However, these types of door closers generally have the following problems: 1. They are prone to oil or air leakage due to poor sealing, leading to door closer failure and the inability to close or open the door or window sash. Moreover, the piston rod is also prone to bending or falling off when subjected to strong opening and closing of the window. In addition, high temperatures, wind, sand, or impurities can easily damage the oil or gas sealing rings, resulting in a very high failure rate and high manufacturing, use, and maintenance costs; 2. They are easily affected by changes in ambient temperature. When the temperature environment changes significantly (such as winter and summer), it has a greater impact on the viscosity and damping force of the internal fluid, leading to unstable operation; 3. The closing force is generally large, causing aging... Young users may find it difficult to open doors and windows, and this can easily cause the fixing screws of the door closer to come loose; 4. During the process of the door closer driving the door and window sash to close, the rotation speed of the door and window sash will increase, causing it to hit the door and window frame at a high speed when closing, resulting in more noise and even damage to the door, window or door closer; In addition, when users manually push and pull the door and window to open, in order to overcome the closing force of the door closer, people generally use more force to open the door and window. When the door and window are opened to the maximum angle, the door and window sash can easily hit the limiting structure with greater force, which can also cause more noise and even damage to the door, window or door closer, thus affecting the user experience and the lifespan of the door and window. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, the present invention aims to provide a rotary door closer and casement doors and windows with a buffer function. This device utilizes the elasticity of a closing spring to provide closing force, featuring a simple structure, stable operation, and resistance to dust accumulation and environmental temperature changes. It also boasts low manufacturing, usage, and maintenance costs, moderate closing force, and ease of use for elderly and young users. Furthermore, it applies damping to the door and window sashes when they are closed or opened to a set angle, but does not apply damping at other opening angles. This effectively prevents noise from door and window sashes impacting the door and window frames or limiting structures, protecting the doors, windows, and door closer. Additionally, it does not apply damping when the opening angle is below the set angle, making it convenient for elderly and young users and providing a good user experience.

[0004] One of the objectives of this invention is achieved through the following technical solution:

[0005] A rotary door closer with a buffer function includes a mounting base, a swing arm, a rotating shaft, a door closing spring, and a buffer wheel. One end of the swing arm is circumferentially fixed to the rotating shaft and hinged to the mounting base via the rotating shaft. One end of the door closing spring is fixed, and the other end is connected to the rotating shaft and can drive the swing arm to rotate relative to the mounting base to provide a closing force. The rotating shaft is provided with a toggle element. The buffer wheel is hinged to the mounting base and the buffer wheel and the mounting base are damped to provide rotational damping for the buffer wheel to rotate relative to the mounting base. The buffer wheel has a first buffer tooth and a second buffer tooth with a certain included angle around its circumference. When the rotating shaft rotates forward and in reverse to a first set angle and a second set angle, the toggle element can actuate the first buffer tooth and the second buffer tooth respectively to drive the buffer wheel to rotate.

[0006] As a preferred technical solution, the first buffer tooth and the second buffer tooth are staggered vertically on the buffer wheel. The actuating element includes an actuating wheel and a first actuating tooth and a second actuating tooth disposed on the actuating wheel, staggered vertically and forming a certain angle around the circumference of the buffer wheel. The heights of the first actuating tooth and the second actuating tooth correspond to the first buffer tooth and the second buffer tooth, respectively. When the rotating shaft rotates to the first set angle and the second set angle in the forward and reverse directions, the first buffer tooth and the second buffer tooth can be actuated by the first actuating tooth and the second actuating tooth to drive the buffer wheel to rotate. The first set angle is the angle of the rotating shaft before the corresponding door or window sash is closed, and the second set angle is the angle of the rotating shaft before the corresponding door or window sash is rotated open to the set angle.

[0007] As a preferred technical solution, the buffer wheel and the first buffer tooth and the second buffer tooth are integrally formed, or the buffer wheel is divided into two independent and circumferentially fixed upper buffer wheel and lower buffer wheel, and the first buffer tooth and the second buffer tooth are respectively fixedly connected to the upper buffer wheel and the lower buffer wheel.

[0008] The actuating wheel and the first and second actuating teeth are integrally formed, or the actuating wheel is divided into two independent upper and lower actuating wheels that are circumferentially fixed and cannot rotate relative to each other, and the first and second actuating teeth are respectively fixedly connected to the upper and lower actuating wheels.

[0009] As a preferred technical solution, the buffer wheel and the mounting base are connected by a damping mechanism. The damping mechanism includes an adjusting rod, an adjusting plate, and at least one elastic damping element. The buffer wheel has a circular through hole and is hinged to the mounting base through the adjusting rod. The adjusting rod also has a threaded section. One of the adjusting plate and the mounting base is threadedly connected to the adjusting rod, and the other is rotatably hooked to the adjusting rod. The buffer wheel is located between the mounting base and the adjusting plate, and an elastic damping element is provided between the buffer wheel and the mounting base and / or between the buffer wheel and the adjusting plate. The mounting base has a limiting structure that can restrict the rotation of the adjusting plate. By rotating the adjusting rod in both directions, the adjusting plate can be driven to reciprocate relative to the mounting base, thereby adjusting the pressure of the elastic damping element on the buffer wheel and the frictional damping force.

[0010] As a preferred technical solution, the mounting base further includes a support portion located below the buffer wheel or the elastic damping element for supporting it. The support portion is provided with a screw hole. The upper end of the adjusting rod is rotatably connected to the adjusting plate, and the lower end passes through the buffer wheel and is threadedly connected to the screw hole provided on the support portion.

[0011] As a preferred technical solution, the mounting base is provided with a receiving groove, the buffer wheel and the damping mechanism are both located in the receiving groove, at least one side of the adjusting plate is a straight edge and abuts against the inner sidewall of the receiving groove to restrict its rotation; the elastic damping element is a butterfly spring, and elastic damping elements are provided between the upper and lower surfaces of the buffer wheel and the adjusting plate and the support.

[0012] As a preferred technical solution, the door closing spring is a spiral spring, with the outer end of the spiral spring fixed and the inner end connected to a rotating shaft. The outer end of the spiral spring is fixed in one of the following ways: the outer end of the spiral spring is fixedly connected to the mounting base, or the outer end of the spiral spring is connected to the mounting base through a force-adjusting mechanism that can adjust the tension of the spiral spring.

[0013] As a preferred technical solution, the other end of the swing arm is provided with a slider and can be rotatably slidably connected to the sliding groove on the door or window sash or door or window frame through the slider, and the mounting base is used for fixed connection with the door or window frame or door or window sash.

[0014] The second objective of this invention is achieved through the following technical solution:

[0015] A casement door and window includes a door and window frame, a door and window sash hinged to the door and window frame, and a rotary door closer with a buffer function as described above. The other end of the swing arm is provided with a slider, which is rotatably and slidably connected to a groove on the door and window sash or door and window frame. The mounting base is fixedly connected to the door and window frame or door and window sash. Before the door and window sash is closed, the rotating shaft rotates forward to a first predetermined angle to cause a toggle to actuate a first buffer tooth, driving a buffer wheel to rotate forward. Before the door and window sash is opened to a predetermined angle, the rotating shaft rotates in the opposite direction to a second predetermined angle to cause a toggle to actuate a second buffer tooth, driving the buffer wheel to rotate in the opposite direction.

[0016] Compared with the prior art, the present invention provides a rotary door closer with a buffer function, the main innovations and beneficial effects of which are as follows:

[0017] 1. Utilizing the elasticity of a door closing spring to provide closing force, this system features a simple structure, stable operation, and is not easily affected by dust accumulation or changes in ambient temperature, resulting in low manufacturing, usage, and maintenance costs. The closing force of the door closing spring is moderate, making it easy for elderly and young users to operate. By incorporating a buffer wheel, damping is applied to the door / window sash when it is closed or opened to a set angle (such as the maximum opening angle), effectively preventing noise from the door / window sash impacting the door / window frame or limiting structure, protecting the door / window and the door closer. At other opening angles, no damping is applied, further enhancing user convenience and providing a good user experience. When the user manually opens the door / window sash, the system automatically stores energy in the door closing spring and automatically resets the buffer wheel. The door / window sash automatically generates a buffering effect before each rotation to the closed or open position, requiring no manual intervention.

[0018] 2. A damping mechanism is set up to achieve a damped connection between the buffer wheel and the mounting base. This damping mechanism can flexibly adjust the rotational damping of the buffer wheel relative to the mounting base by rotating the adjustment rod in both directions. This allows users to flexibly adjust the buffering force according to their preferences or actual conditions, and the adjustment operation is convenient and quick.

[0019] The following will further explain the concept, specific structure and effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the rotating door closer with a buffer function in the embodiment;

[0021] Figure 2 yes Figure 1 A schematic diagram of its decomposed structure.

[0022] The components include: mounting base 1, support part 11, receiving groove 12, spiral spring 2, rotating shaft 3, swing arm 4, buffer wheel 5, first buffer tooth 51, second buffer tooth 52, upper buffer wheel 53, lower buffer wheel 54, first shift tooth 61, second shift tooth 62, shift wheel 63, upper shift wheel 631, lower shift wheel 632, adjusting rod 71, adjusting plate 72, and elastic damping element 73. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] It should be noted that when one component is referred to as "connecting" or "mounting" another component, it can be a direct connection or mounting to the other component, or an indirect connection or mounting via an intervening component. Furthermore, the terms "upper," "lower," "left," "right," "inner," "outer," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] Example 1:

[0026] like Figure 1-2As shown, this embodiment provides a rotary door closer with a buffer function, including a mounting base 1, a spiral spring 2, a rotating shaft 3, a swing arm 4, and a buffer wheel 5. One end of the swing arm 4 is circumferentially fixedly connected to the rotating shaft 3 and hinged to the mounting base 1 through the rotating shaft 3. One end of the spiral spring 2 is fixed, and the other end is connected to the rotating shaft 3 and can drive it to rotate the swing arm 4 relative to the mounting base 1 to provide a closing force. A toggle is circumferentially fixedly connected to the rotating shaft 3. The buffer wheel 5 is hinged to the mounting base 1 and the buffer wheel 5 is dampedly connected to the mounting base 1 so that the buffer wheel 5 has rotational damping when rotating relative to the mounting base 1. The buffer wheel 5 has a first buffer tooth 51 and a second buffer tooth 52 with a certain included angle around its circumference. When the rotating shaft 3 rotates forward and in reverse to a first set angle (e.g., before the corresponding door or window is closed) and a second set angle (e.g., before the corresponding door or window is opened to the maximum opening angle), the toggle can respectively actuate the first buffer tooth 51 and the second buffer tooth 52 to drive the buffer wheel 5 to rotate. In this embodiment, the first buffer tooth 51 and the second buffer tooth 52 are preferably staggered vertically on the buffer wheel 5. The actuating element includes an actuating wheel 63 and a first actuating tooth 61 and a second actuating tooth 62 that are staggered vertically on the actuating wheel 63 and form a certain angle around the circumference of the buffer wheel 5. The heights of the first actuating tooth 61 and the second actuating tooth 62 correspond to the heights of the first buffer tooth 51 and the second buffer tooth 52, respectively. In addition, in this embodiment, the closing spring is preferably a spiral spring 2. The outer end of the spiral spring 2 is fixed, and the inner end is connected to the rotating shaft 3, so that the spiral spring 2 can apply torque to the rotating shaft 3 to drive the rotating shaft 3 to rotate relative to the mounting base 1 to provide the closing force of the spiral spring 2.

[0027] The rotating door closer with buffer function provided in this embodiment is used in which the mounting base 1 is fixedly connected to the door or window sash or door or window frame, and the other end of the swing arm 4 is hinged to a slider, which is rotatably slidably connected to the sliding groove (or independently set sliding groove) on the door or window frame or door or window sash (omitted in the attached figure). Its working principle is as follows: During the process of the door closer driving the door or window sash to close, the spiral spring 2 uses its torque to drive the rotating shaft 3 to rotate in the forward direction. The rotating shaft 3 drives the swing arm 4 to rotate to drive the door or window sash to rotate in the closing direction. When the rotating shaft 3 rotates in the forward direction to the first set angle (at this time the door or window sash rotates to the point before closing), the first tooth 61 can just push the first buffer tooth 51 to drive the buffer wheel 5 to rotate in the forward direction, so that the rotational damping of the buffer wheel 5 can be used to react with the rotating shaft 3 to achieve buffering when the door or window sash is closed. During the process of manually opening and closing doors and windows, the user manually pushes and pulls the door and window sashes in the opening direction. This will cause the swing arm 4 to drive the rotating shaft 3 to rotate in the opposite direction and cause the spiral spring 2 to store energy. When the rotating shaft 3 rotates in the opposite direction to the second set angle (at which point the door and window sashes have rotated to the set angle, such as the maximum opening angle), the second prying tooth 62 can just pry the second buffer tooth 52 to drive the buffer wheel 5 to rotate in the opposite direction. This allows the rotational damping of the buffer wheel 5 to react with the traction plate, thus achieving buffering of the door and window sashes opening to the set angle. Furthermore, when one of the first buffer tooth 51 and the second buffer tooth 52 is pryed to drive the buffer wheel 5 to rotate, it will also cause the other to automatically reset. This ensures that the door and window sashes can automatically generate a buffering effect each time they rotate to close or rotate to open to the set angle, without the need for manual intervention or adjustment.

[0028] This embodiment provides a rotary door closer with a buffer function. Its main innovations and beneficial effects are as follows: It utilizes the elasticity of the spiral spring 2 to provide the closing force, resulting in a simple structure, stable operation, and resistance to dust accumulation and environmental temperature changes, leading to low manufacturing, usage, and maintenance costs; the closing force of the closing spring is moderate, making it easy for elderly and young users to use; by setting a buffer wheel 5, it can apply damping to the door / window sash when it is closed or opened to a set angle (such as the maximum opening angle), effectively preventing noise generated by the door / window sash hitting the door / window frame or limiting structure, protecting the door / window and the door closer; and at other opening angles, no damping is applied, making it convenient for the elderly. It is designed for young users and provides a good user experience. When the user manually opens the door or window, it can automatically store energy in the closing spring and automatically reset the buffer wheel 5. The door or window can automatically generate a buffer effect before each rotation to close or open to a set angle without manual intervention. Moreover, by setting two staggered teeth to actuate the two buffer teeth, the advantage of this design is that even when the included angle between the first and second set angles is large, as long as the positions of the two teeth and the two buffer teeth are designed properly, the two teeth can still actuate the two buffer teeth at the first and second set angles respectively.

[0029] In a preferred embodiment, the buffer wheel 5 and the mounting base 1 are connected by a damping mechanism. The damping mechanism includes an adjusting rod 71, an adjusting plate 72, and an elastic damping element 73. The buffer wheel 5 has a circular through hole and is hinged to the mounting base 1 through the adjusting rod 71. The adjusting rod 71 also has a threaded section. One of the adjusting plate 72 and the mounting base 1 is threadedly connected to the adjusting rod 71, and the other is rotatably hooked to the adjusting rod 71. The buffer wheel 5 is located between the mounting base 1 and the adjusting plate 72, and an elastic damping element 73 is provided between the buffer wheel 5 and the mounting base 1 and / or between the buffer wheel 5 and the adjusting plate 72. The mounting base 1 has a limiting structure that can restrict the rotation of the adjusting plate 72. By rotating the adjusting rod 71 in both directions, the adjusting plate 72 can be driven to reciprocate relative to the mounting base 1, thereby adjusting the pressure of the elastic damping element 73 on the buffer wheel 5 and the frictional damping force.

[0030] As a preferred embodiment, the mounting base 1 further includes a support portion 11, which is located below the elastic damping member 73 for supporting it. The support portion 11 is provided with a screw hole. The upper end of the adjusting rod 71 is rotatably hooked to the adjusting plate 72, and the lower end passes through the buffer wheel 5 and is threadedly connected to the screw hole provided on the support portion 11.

[0031] As a preferred embodiment, the mounting base 1 is provided with a receiving groove 12, the buffer wheel 5 and the damping mechanism are both located in the receiving groove 12, at least one side of the adjusting plate 72 is a straight edge and abuts against the inner sidewall of the receiving groove 12 to limit its rotation; the elastic damping element 73 is a butterfly spring, and elastic damping elements 73 are provided between the upper and lower surfaces of the buffer wheel 5 and the adjusting plate 72 and the support part 11.

[0032] In a preferred embodiment, the outer end of the spiral spring 2 is fixed by being fixedly connected to the mounting base 1. In other embodiments, the outer end of the spiral spring 2 may also be fixed by being connected to the mounting base 1 through a force-adjusting mechanism that can adjust the tension of the spiral spring 2; the accompanying drawings for this embodiment are omitted.

[0033] In a preferred embodiment, the buffer wheel 5 consists of two independent, circumferentially fixed upper buffer wheel 53 and lower buffer wheel 54 that cannot rotate relative to each other. The circumferential fixing method is as follows: the contact portion between the adjusting rod 71 and the two wheels is a non-circular shaft and a non-circular hole (e.g., a polygonal shaft with a polygonal hole). The first buffer tooth 51 and the second buffer tooth 52 are respectively fixedly connected to the upper buffer wheel 53 and the lower buffer wheel 54. In other embodiments, the buffer wheel 5 and the first buffer tooth 51 and the second buffer tooth 52 can also be an integrally formed structure.

[0034] In a preferred embodiment, the actuating wheel 63 is divided into two independent, circumferentially fixed upper actuating wheel 631 and lower actuating wheel 632. The circumferential fixing method is as follows: the contact area between the rotating shaft 3 and the two wheels is a non-circular shaft and a non-circular hole (e.g., a polygonal shaft with a polygonal hole). The first actuating tooth 61 and the second actuating tooth 62 are respectively fixedly connected to the upper actuating wheel 631 and the lower actuating wheel 632. In other embodiments, the actuating wheel 63 and the first actuating tooth 61 and the second actuating tooth 62 can also be an integrally formed structure.

[0035] It should be noted that in other embodiments, the actuating element may also include only one actuating tooth, and the first buffer tooth 51 and the second buffer tooth 52 may also be arranged at a certain angle in the same horizontal plane, as long as the actuating element can actuate the first buffer tooth 51 and the second buffer tooth 52 respectively when rotating with the rotating shaft 3 to the first set angle and the second set angle. In addition, the closing spring can also be replaced with a tension spring, one end of which is fixed, and the other end is wound around the rotating shaft 3 through a flexible pull strap, with the inner end of the pull strap connected to the roller. The tension of the tension spring can apply torque to the rotating shaft 3 through the pull strap to drive the rotating shaft 3 to rotate relative to the mounting base 1.

[0036] Example 2:

[0037] This embodiment provides a casement door / window, including a door / window frame, a door / window sash hinged to the door / window frame, and a rotating door closer with a buffer function as described in Embodiment 1. The other end of the swing arm is provided with a slider, which is rotatably and slidably connected to a groove on the door / window sash or door / window frame. The mounting base is fixedly connected to the door / window frame or door / window sash. Before the door / window sash is closed, the rotating shaft rotates forward to the first set angle to cause the actuating element to actuate the first buffer tooth, driving the buffer wheel to rotate. Before the door / window sash is opened to the set angle, the rotating shaft rotates in the reverse direction to the second set angle to cause the actuating element to actuate the second buffer tooth, driving the buffer wheel to rotate. The accompanying drawings for this embodiment are omitted.

[0038] It should be noted that the sliding groove can be a separately installed component or a profile groove integrated into the profile of the door / window sash / frame. Similarly, the mounting base can be a separately installed component or a profile of the door / window frame / sash.

[0039] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A rotary door closer with a buffer function, characterized in that, The device includes a mounting base, a swing arm, a rotating shaft, a closing spring, and a buffer wheel. One end of the swing arm is circumferentially fixed to the rotating shaft and hinged to the mounting base via the rotating shaft. One end of the closing spring is fixed, and the other end is connected to the rotating shaft and can drive the swing arm to rotate relative to the mounting base to provide closing force. The rotating shaft is equipped with a toggle element. The buffer wheel is hinged to the mounting base, and the buffer wheel and the mounting base are damped to provide rotational damping for the buffer wheel to rotate relative to the mounting base. The buffer wheel has a first buffer tooth and a second buffer tooth with a certain included angle around its circumference. When the rotating shaft rotates forward and in the opposite direction to a first set angle and a second set angle, the toggle element can actuate the first buffer tooth and the second buffer tooth respectively to drive the buffer wheel to rotate.

2. The rotary door closer with buffer function according to claim 1, characterized in that, The first and second buffer teeth are staggered vertically on the buffer wheel. The actuating element includes an actuating wheel and a first and second actuating teeth that are staggered vertically on the actuating wheel and form a certain angle around the circumference of the buffer wheel. The heights of the first and second actuating teeth correspond to the first and second buffer teeth, respectively. When the rotating shaft rotates to the first and second set angles in the forward and reverse directions, the first and second actuating teeth can respectively actuate the first and second buffer teeth to drive the buffer wheel to rotate. The first set angle is the angle of the rotating shaft before the corresponding door or window is closed, and the second set angle is the angle of the rotating shaft before the corresponding door or window is opened to the set angle.

3. The rotary door closer with buffer function according to claim 2, characterized in that, The buffer wheel and the first buffer tooth and the second buffer tooth are integrally formed, or the buffer wheel is divided into two independent and circumferentially fixed upper buffer wheel and lower buffer wheel, and the first buffer tooth and the second buffer tooth are respectively fixedly connected to the upper buffer wheel and the lower buffer wheel. The actuating wheel and the first and second actuating teeth are integrally formed, or the actuating wheel is divided into two independent upper and lower actuating wheels that are circumferentially fixed and cannot rotate relative to each other, and the first and second actuating teeth are respectively fixedly connected to the upper and lower actuating wheels.

4. The rotary door closer with buffer function according to claim 1, characterized in that, The buffer wheel and the mounting base are connected by a damping mechanism, which includes an adjusting rod, an adjusting plate, and at least one elastic damping element. The buffer wheel has a circular through hole and is hinged to the mounting base through the adjusting rod. The adjusting rod also has a threaded section. One of the adjusting plate and the mounting base is threaded to the adjusting rod, and the other is rotatably hooked to the adjusting rod. The buffer wheel is located between the mounting base and the adjusting plate, and an elastic damping element is provided between the buffer wheel and the mounting base and / or between the buffer wheel and the adjusting plate. The mounting base has a limiting structure that can restrict the rotation of the adjusting plate. By rotating the adjusting rod in both directions, the adjusting plate can be driven to reciprocate relative to the mounting base, thereby adjusting the pressure of the elastic damping element on the buffer wheel and the frictional damping force.

5. The rotary door closer with buffer function according to claim 4, characterized in that, The mounting base also includes a support portion located below the buffer wheel or the elastic damping element for supporting it. The support portion is provided with a screw hole. The upper end of the adjusting rod is rotatably hooked to the adjusting plate, and the lower end passes through the buffer wheel and is threadedly connected to the screw hole provided on the support portion.

6. The rotary door closer with buffer function according to claim 5, characterized in that, The mounting base is provided with a receiving groove, and the buffer wheel and damping mechanism are both located in the receiving groove. At least one side of the adjusting plate is a straight edge and abuts against the inner sidewall of the receiving groove, thereby restricting its rotation. The elastic damping element is a butterfly spring, and elastic damping elements are provided between the upper and lower surfaces of the buffer wheel and the adjusting plate and the support.

7. The rotary door closer with buffer function according to claim 1, characterized in that, The closing spring is a spiral spring, with its outer end fixed and its inner end connected to a rotating shaft. The outer end of the spiral spring can be fixed by either being fixedly connected to the mounting base, or by the outer end of the spiral spring being connected to the mounting base through a force-adjusting mechanism that can adjust the tension of the spiral spring.

8. The rotary door closer with buffer function according to claim 1, characterized in that, The other end of the swing arm is provided with a slider and can be rotatably slidably connected to the sliding groove on the door or window sash or door or window frame through the slider. The mounting base is used to fix it to the door or window frame or door or window sash.

9. A casement door and window, characterized in that, The device includes a door and window frame, a door and window sash hinged to the door and window frame, and a rotating door closer with a buffer function as described in any one of claims 1-8. The other end of the swing arm is provided with a slider, which is rotatably and slidably connected to a groove on the door and window sash or door and window frame. The mounting base is fixedly connected to the door and window frame or door and window sash. Before the door and window sash is rotated to the closed position, the rotating shaft rotates forward to the first set angle to cause the actuating element to actuate the first buffer tooth, driving the buffer wheel to rotate forward. Before the door and window sash is rotated to the open position to the set angle, the rotating shaft rotates in the reverse direction to the second set angle to cause the actuating element to actuate the second buffer tooth, driving the buffer wheel to rotate in the reverse direction.

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