Door closing device and door body device

Abstract

This utility model belongs to the technical field of door fittings, and particularly relates to door closing devices and door body devices. The door closing device includes: a housing; a rotation adjustment mechanism disposed within the housing; a damping mechanism disposed within the housing and abutting one side of the rotation adjustment mechanism; a closing speed adjustment mechanism disposed within the housing and connected to the damping mechanism; a reset mechanism disposed within the housing and abutting the other side of the rotation adjustment mechanism; and a base mechanism disposed outside the housing, with the rotation adjustment mechanism mounted on the base mechanism. By adjusting the closing speed adjustment mechanism, the user can adjust the damping force of the damping mechanism, achieving independent and precise adjustment of the closing speed, thereby resulting in a better closing effect.

Description

Technical Field

[0001] This utility model belongs to the field of door fittings technology, and particularly relates to door closing devices and door body devices. Background Technology

[0002] Door closers are indispensable hardware components in modern buildings. Their basic function is to enable open doors to close automatically and smoothly. Traditional door closers typically use a spring mechanism to provide closing power and a hydraulic damping system to absorb energy. However, the damping force of the hydraulic damping system cannot be adjusted, which in turn means that the closing speed cannot be adjusted, resulting in an inadequate closing effect. Utility Model Content

[0003] This utility model provides a door closing device and a door body device, aiming to solve the technical problem that the damping force of the existing hydraulic damping system of the door closer cannot be adjusted, which in turn leads to the inability to adjust the closing speed and thus cannot bring about a better closing effect.

[0004] This utility model is implemented as follows: it provides a door closing device, comprising:

[0005] case;

[0006] A rotation adjustment mechanism is provided inside the housing;

[0007] A damping mechanism disposed within the housing and abutting against one side of the rotary adjustment mechanism;

[0008] A door closing speed adjustment mechanism is disposed within the housing and connected to the damping mechanism.

[0009] A reset mechanism disposed within the housing and abutting against the other side of the rotary adjustment mechanism; and

[0010] The base mechanism is located outside the housing, and the rotation adjustment mechanism is located on the base mechanism.

[0011] In some embodiments, the door closing speed adjustment mechanism includes a first tail cover, a first gear disposed on the first tail cover, and a second gear meshing with the first gear. The first gear extends partially out of the housing, and a non-circular hole is provided at the middle position of the second gear. The damping mechanism is connected to the non-circular hole.

[0012] In some embodiments, the damping mechanism includes a damping housing, an oil needle assembly disposed within the damping housing, a piston assembly disposed within the damping housing and fitted onto the oil needle assembly, and a damping tail cap fitted onto one end of the oil needle assembly.

[0013] In some embodiments, the oil needle assembly includes an oil needle, a sealing ring, an oil needle sealing plate, and an oil needle pressing plate. One end of the oil needle is provided with a connecting end that is adapted to the shape of the non-circular hole, and the connecting end extends into the non-circular hole. The sealing ring is provided at the other end of the oil needle. The oil needle sealing plate and the oil needle pressing plate are tightly fitted together and sleeved on the oil needle.

[0014] In some embodiments, the piston assembly includes a piston rod, a damping sealing plate, a damping spring, a piston plate, a piston ring, and a piston protrusion. The oil needle is disposed inside the piston rod, the damping spring is sleeved on the piston rod, the damping sealing plate is sleeved on the piston rod and abuts against one end of the damping spring, the oil needle sealing plate and the oil needle pressure plate are sleeved on the piston rod, and the oil needle sealing plate abuts against the other end of the damping spring. The piston plate, the piston ring, and the piston protrusion are sequentially and tightly fitted onto the piston rod, and the piston plate is disposed adjacent to the oil needle pressure plate.

[0015] In some embodiments, the rotation adjustment mechanism includes a rotating shaft with a tapered portion that abuts against the damping mechanism.

[0016] In some embodiments, the rotation adjustment mechanism further includes a first bearing and a second bearing, the first bearing being sleeved on the upper part of the rotating shaft and the second bearing being sleeved on the lower part of the rotating shaft.

[0017] In some embodiments, the reset mechanism includes a spring pusher, a connecting shaft, a reset spring, and a second tail cover. One end of the spring pusher abuts against the rotary adjustment mechanism, the connecting shaft connects to the other end of the spring pusher, the reset spring is sleeved on the connecting shaft, and the second tail cover abuts against the connecting shaft.

[0018] In some embodiments, the base mechanism includes a fixed seat, an angle seat, and a cover, the angle seat being disposed in the fixed seat, the cover being disposed on the fixed seat, and the rotation adjustment mechanism extending sequentially into the cover and the angle seat.

[0019] This utility model also provides a door device, including a door body and a door closing device as described in any of the above embodiments, wherein the base mechanism is disposed on the door body.

[0020] The beneficial effects achieved by this utility model are:

[0021] When the door is opened, the base mechanism drives the rotary adjustment mechanism to rotate. This action compresses the reset mechanism, storing the elastic potential energy required for closing the door; simultaneously, the rotary adjustment mechanism pushes the damping mechanism. During the closing process, the reset mechanism releases energy, driving the rotary adjustment mechanism to move in the opposite direction, thus closing the door. During this process, the damping mechanism generates a controllable damping force, ensuring a smooth closing action. Users can adjust the closing speed by regulating the closing speed adjustment mechanism, thereby achieving independent and precise adjustment of the closing speed and resulting in a better closing effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the door closing device provided in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram from another perspective of the door closing device provided in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of a door closing device with the shell removed, provided in an embodiment of the present invention;

[0025] Figure 4 yes Figure 3 A magnified view of part A;

[0026] Figure 5 This is a schematic diagram of the damping mechanism provided in an embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the rotation adjustment mechanism provided in an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the reset mechanism provided in an embodiment of the present utility model;

[0029] Figure 8 This is an exploded view of the door closing device provided in an embodiment of this utility model. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0031] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0036] This utility model provides a door closing device, see reference. Figures 1-3 ,as well as Figure 8 ,include:

[0037] Casing 100;

[0038] A rotation adjustment mechanism 200 is provided inside the housing 100;

[0039] A damping mechanism 300 is disposed inside the housing 100 and abuts against one side of the rotation adjustment mechanism 200;

[0040] A door closing speed adjustment mechanism 400 is disposed inside the housing 100 and connected to the damping mechanism 300;

[0041] A reset mechanism 500 disposed within the housing 100 and abutting against the other side of the rotation adjustment mechanism 200; and

[0042] The base mechanism is disposed outside the housing 100, and the rotation adjustment mechanism 200 is disposed on the base mechanism.

[0043] The housing 100 serves as the main load-bearing structure, providing load-bearing capacity for the rotation adjustment mechanism 200, damping mechanism 300, door closing speed adjustment mechanism 400, reset mechanism 500, and base mechanism.

[0044] The rotary adjustment mechanism 200, serving as the core for power transmission and initial force adjustment, is mounted on the base mechanism and connected to the door body, converting the door's opening and closing motion into its own rotational motion. The damping mechanism 300 is located on one side of the rotary adjustment mechanism 200 and abuts against that side, generating a controllable damping force during the closing process. The closing speed adjustment mechanism 400 is connected to the damping mechanism 300, allowing the user to adjust the damping force of the damping mechanism 300 by operating the closing speed adjustment mechanism 400, thus achieving fine-tuning of the closing speed. The reset mechanism 500 is located on the other side of the rotary adjustment mechanism 200 and abuts against that side, providing the elastic potential energy required for closing. The base mechanism is located outside the housing 100 and is used to install the entire closing device onto the door body.

[0045] When the door is opened, the base mechanism drives the rotary adjustment mechanism 200 to rotate. This action compresses the reset mechanism 500, storing the elastic potential energy required for closing the door; simultaneously, the rotary adjustment mechanism 200 pushes the damping mechanism 300. During the closing process, the reset mechanism 500 releases energy, driving the rotary adjustment mechanism 200 to move in the opposite direction, thereby closing the door. During this process, the damping mechanism 300 generates a controllable damping force, ensuring a smooth closing action. Users can adjust the closing speed by regulating the closing speed adjustment mechanism 400, thereby achieving independent and precise adjustment of the closing speed and resulting in a better closing effect.

[0046] In some specific embodiments of this application, reference is made to Figure 3 , Figure 4 and Figure 8 The closing speed adjustment mechanism 400 includes a first tail cover 410, a first gear 420 disposed on the first tail cover 410, and a second gear 430 meshing with the first gear 420. The first gear 420 extends out of the housing 100. A non-circular hole is provided in the middle position of the second gear 430. The damping mechanism 300 is connected to the non-circular hole.

[0047] The end of the housing 100 is blocked by the first tail cap 410, which is circular. One end of the housing 100 has a circular hole. The first tail cap 410 is inserted into the circular hole of the housing 100 to fix the two together.

[0048] A first gear 420 is disposed on a first tail cover 410, the first tail cover 410 having a first rotating hole and the first gear 420 having a second rotating hole. A rotating drive shaft passes through the first rotating hole and the second rotating hole in sequence, enabling the first gear 420 to rotate around the first tail cover 410. In some embodiments, the first rotating hole is disposed at a non-central position of the first tail cover 410.

[0049] The second gear 430 has a non-circular hole at its center, such as a D-shaped hole, a square hole, or a hexagonal hole. When the second gear 430 rotates, it connects to the damping mechanism 300 through the non-circular hole, and the second gear 430 drives the damping mechanism 300 to rotate.

[0050] When the user manually rotates the exposed first gear 420, a speed reduction and torque amplification transmission system is formed through the meshing of the first gear 420 and the second gear 430. This design allows the user's subtle rotational movements to be precisely amplified and transmitted, driving the second gear 430 to rotate with a more stable torque. Because the non-circular hole of the second gear 430 is connected to the damping mechanism 300, the rotation of the second gear 430 directly drives the damping mechanism 300 to produce precise and minute displacements in its axial direction without any slippage. This results in a linear change in the damping force of the damping mechanism 300, thereby achieving stepless, linear, and fine adjustment of the closing speed from fast to slow.

[0051] Further, refer to Figure 2 On the surface of the housing 100, near the position where the first gear 420 extends, there are markings marked with "+" and "-", representing an increase in damping force and a decrease in damping force, respectively. The user can clearly understand from these markings that rotating the first gear 420 in the "+" direction increases the damping force of the damping mechanism 300, and rotating it in the "-" direction decreases the damping force of the damping mechanism 300.

[0052] In some specific embodiments of this application, reference is made to Figure 5 and Figure 8 The damping mechanism 300 includes a damping housing 310, an oil needle assembly disposed within the damping housing 310, a piston assembly disposed within the damping housing 310 and sleeved on the oil needle assembly, and a damping tail cap 340 sleeved on one end of the oil needle 321.

[0053] The needle valve assembly and piston assembly are housed within the damping housing 310. The damping cap 340 is fitted over one end of the needle valve assembly, sealing the damping housing 310. The damping housing 310 is filled with hydraulic oil. The needle valve assembly, designed as a needle valve, allows for stepless adjustment of the damping force by changing the position of the needle valve 321.

[0054] During the closing process, the piston assembly moves within the damping housing 310 under the drive of the reset mechanism 500, compressing the hydraulic oil flow. The needle valve assembly extends into the flow channel inside the piston assembly, and its position change alters the size of the gap through which the hydraulic oil flows. When the closing speed regulating mechanism 400 drives the needle valve assembly to move, the cross-sectional area of ​​the flow channel changes, thereby linearly altering the resistance to hydraulic oil flow, i.e., the damping force.

[0055] In some specific embodiments of this application, reference is made to Figure 5 and Figure 8 The oil needle assembly includes an oil needle 321, a sealing ring 322, an oil needle sealing piece 323, and an oil needle pressing piece 324. One end of the oil needle 321 is provided with a connecting end that is adapted to the shape of the non-circular hole and extends into the non-circular hole. The sealing ring 322 is provided at the other end of the oil needle 321. The oil needle sealing piece 323 and the oil needle pressing piece 324 are tightly fitted together and sleeved on the oil needle 321.

[0056] The needle valve assembly is the core component for achieving precise speed control, and it further includes a needle valve 321, a sealing ring 322, a needle valve sealing plate 323, and a needle valve pressure plate 324. One end of the needle valve 321 has a connecting end whose shape matches the non-circular hole of the second gear 430, ensuring accurate power transmission. In some embodiments, the non-circular hole of the second gear 430 is a D-shaped hole, and the connecting end of the needle valve 321 is a D-shaped shaft. The connection between the needle valve 321 and the second gear 430 is achieved by inserting the D-shaped shaft into the D-shaped hole. The middle section of the needle valve 321 is a smooth shaft or a needle valve with a specific taper. The sealing ring 322 is located at the other end of the needle valve 321 to ensure a dynamic seal between the needle valve 321 and the damping cap 340, preventing hydraulic oil leakage. The needle valve sealing plate 323 and the needle valve pressure plate 324 are tightly fitted onto the needle valve 321 for axial positioning and auxiliary sealing.

[0057] The rotation of the second gear 430, through the engagement of the non-circular hole and the connecting end, directly drives the oil needle 321 to produce precise axial displacement. The movement of the oil needle 321 changes the relative position of its tapered section within the inner bore of the piston assembly, linearly altering the flow area of ​​the hydraulic oil, thereby achieving precise control of the damping force.

[0058] In some specific embodiments of this application, reference is made to Figure 5 and Figure 8 The piston assembly includes a piston rod 331, a damping sealing plate 332, a damping spring 333, a piston plate 334, a piston ring 335, and a piston protrusion 336. The oil needle 321 is disposed inside the piston rod 331. The damping spring 333 is sleeved on the piston rod 331. The damping sealing plate 332 is sleeved on the piston rod 331 and abuts against one end of the damping spring 333. The oil needle sealing plate 323 and the oil needle pressure plate 324 are sleeved on the piston rod 331, with the oil needle sealing plate 323 abutting against the other end of the damping spring 333. The piston plate 334, the piston ring 335, and the piston protrusion 336 are sequentially and tightly attached to the piston rod 331, and the piston plate 334 is disposed adjacent to the oil needle pressure plate 324.

[0059] In some embodiments, the oil needle 321 is disposed inside the piston rod 331, and there is a gap between the front end of the oil needle 321 and the piston rod 331. The piston rod 331 has a through hole that connects to the cavity where the oil needle 321 is located, and the hydraulic oil squeezed by the oil needle 321 can flow out through the gap from the through hole.

[0060] The piston rod 331 is hollow, and the oil needle 321 passes through the piston rod 331. The damping spring 333 is sleeved on the piston rod 331. The damping sealing plate 332 is sleeved on the piston rod 331 and abuts against one end of the damping spring 333. The oil needle sealing plate 323 and the oil needle pressing plate 324 are sleeved on the other end of the piston rod 331 and together abut against the other end of the damping spring 333, so that the damping spring 333 is in a pre-compressed state, ensuring that the piston assembly and the rotary adjustment mechanism 200 maintain close contact.

[0061] At the front end of the piston rod 331, a piston plate 334, a piston ring 335, and a piston protrusion 336 are sequentially and tightly fitted together. The piston plate 334, piston ring 335, and piston protrusion 336 are tightly fitted with the inner wall of the damping housing 310, dividing the damping housing 310 into a high-pressure chamber and a low-pressure chamber, and ensuring a reliable seal between the high-pressure chamber and the low-pressure chamber.

[0062] Under the closing force, the entire piston assembly moves within the damping housing 310, generating a damping force through the action of hydraulic oil. The damping spring 333 provides a counterforce, ensuring that the piston assembly remains in contact with the rotary adjustment mechanism 200 when there is no external force.

[0063] In some specific embodiments of this application, reference is made to Figure 6 and Figure 8 The rotation adjustment mechanism 200 includes a rotation shaft 210, on which a tapered portion is provided, and the tapered portion abuts against the damping mechanism 300.

[0064] A tapered portion is provided on the rotating shaft 210, which abuts against the damping housing 310 of the damping mechanism 300. When the door is opened, the rotating shaft 210 rotates accordingly, and the contour of the tapered portion pushes the damping mechanism 300 to move, while the reset mechanism 500 is compressed. In the initial stage of closing the door, the reset mechanism 500 releases energy, pushing the rotating shaft 210 to reverse, and the pressure of the tapered portion on the damping mechanism 300 is gradually released. Through the contour design of the tapered portion, the speed and force distribution at different stages of the closing process (such as large opening and small opening) can be optimized.

[0065] In some specific embodiments of this application, reference is made to Figure 6 and Figure 8The rotation adjustment mechanism 200 further includes a first bearing 220 and a second bearing 230. The first bearing 220 is sleeved on the upper part of the rotation shaft 210, and the second bearing 230 is sleeved on the lower part of the rotation shaft 210.

[0066] A first annular groove is provided on the upper part of the rotating shaft 210, and a first bearing 220 is fitted into the first annular groove. A second annular groove is provided on the lower part of the rotating shaft 210, and a second bearing 230 is fitted into the second annular groove. The first bearing 220 and the second bearing 230 together support the rotating shaft 210, allowing the rotating shaft 210 to rotate flexibly and with low friction. This greatly reduces the mechanical loss during the movement of the rotating adjustment mechanism 200, and improves the sensitivity, efficiency, and service life of the door closing device.

[0067] It is worth mentioning that most of the weight of the door and the impact force generated by opening and closing the door are applied to the rotating shaft 210 through the base mechanism, and are ultimately borne by the second bearing 230 with a high radial load. Therefore, the second bearing 230 constitutes a solid support point for the adjustment mechanism 200, which can stably support the huge radial force and impact load generated by the weight of the door and its motion inertia, ensuring that the rotating shaft 210 can maintain smooth and stable rotation under any working conditions, effectively preventing bearing wear, shaft misalignment and overall shaking caused by long-term heavy load.

[0068] In some specific embodiments of this application, reference is made to Figure 7 and Figure 8 The reset mechanism 500 includes a spring pusher 510, a connecting shaft 520, a reset spring 530, and a second tail cover 540. One end of the spring pusher 510 abuts against the rotary adjustment mechanism 200, the connecting shaft 520 connects to the other end of the spring pusher 510, the reset spring 530 is sleeved on the connecting shaft 520, and the second tail cover 540 abuts against the connecting shaft 520.

[0069] One end of the spring push head 510 abuts against the rotary adjustment mechanism 200, specifically against the rotary shaft 210, and more specifically against the side of the rotary shaft 210 opposite to the tapered part.

[0070] The second tail cover 540 blocks the end of the housing 100. At least part of the surface of the second tail cover 540 is provided with threads, and the inside of the housing 100 is provided with a threaded wall. The second tail cover 540 is screwed into the inside of the housing 100 by twisting the threads of the second tail cover 540 and the threaded wall of the housing 100 together.

[0071] When the door is opened, the rotary adjustment mechanism 200 rotates, pushing the spring pusher head 510. The spring pusher head 510 moves relative to the connecting shaft 520, causing the spring pusher head 510 to compress the return spring 530. The return spring 530 converts kinetic energy into elastic potential energy and stores it. When the door is closed, the compressed return spring 530 pushes the spring pusher head 510, which in turn pushes the rotary shaft 210 to rotate in the opposite direction, releasing the potential energy and providing the closing power.

[0072] In some specific embodiments of this application, reference is made to Figure 8 The base mechanism includes a fixed base 610, an angle base 620, and a face cover 630. The angle base 620 is disposed in the fixed base 610, and the face cover 630 is disposed on the fixed base 610. The rotation adjustment mechanism 200 extends into the face cover 630 and the angle base 620 in sequence, and extends out from the angle base 620.

[0073] The fixed base 610 has a central cavity, in which the angle seat 620 is fixedly disposed. The cover 630 is placed on the fixed base 610. The rotation adjustment mechanism 200 extends sequentially into the cover 630 and the angle seat 620, specifically, the rotation shaft 210 extends sequentially into the cover 630 and the angle seat 620. The fixed base 610 is fixed to the door body. When the door is opened, the door body moves the fixed base 610, and the movement of the fixed base 610 causes the angle seat 620 and the cover 630 to rotate the rotation shaft 210.

[0074] This utility model also provides a door device, including a door body and a door closing device as described in any of the above embodiments, wherein the base mechanism is disposed on the door body.

[0075] When the door is opened, the door body moves the base mechanism, which in turn drives the rotary adjustment mechanism 200 to rotate. On one hand, the rotary adjustment mechanism 200 compresses the reset mechanism 500, storing the elastic potential energy required for closing the door; on the other hand, it pushes the damping mechanism 300. During the closing process, the reset mechanism 500 releases energy, driving the rotary adjustment mechanism 200 to move in the opposite direction, thus closing the door. During this process, the damping mechanism 300 generates a controllable damping force, ensuring a smooth closing action. Users can adjust the damping force of the damping mechanism 300 by adjusting the closing speed adjustment mechanism 400, achieving independent and precise adjustment of the closing speed for better closing performance.

[0076] In the description of this specification, references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the described embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] Furthermore, the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A door closing device, characterized in that, include: case; A rotation adjustment mechanism is provided inside the housing; A damping mechanism disposed within the housing and abutting against one side of the rotary adjustment mechanism; A door closing speed adjustment mechanism is disposed within the housing and connected to the damping mechanism. A reset mechanism is disposed within the housing and abuts against the other side of the rotation adjustment mechanism; as well as The base mechanism is located outside the housing, and the rotation adjustment mechanism is located on the base mechanism.

2. The door closing device according to claim 1, characterized in that, The door closing speed adjustment mechanism includes a first tail cover, a first gear disposed on the first tail cover, and a second gear meshing with the first gear. The first gear extends out of the housing, and a non-circular hole is provided at the middle position of the second gear. The damping mechanism is connected to the non-circular hole.

3. The door closing device according to claim 2, characterized in that, The damping mechanism includes a damping housing, an oil needle assembly disposed within the damping housing, a piston assembly disposed within the damping housing and fitted onto the oil needle assembly, and a damping tail cap fitted onto one end of the oil needle assembly.

4. The door closing device according to claim 3, characterized in that, The oil needle assembly includes an oil needle, a sealing ring, an oil needle sealing plate, and an oil needle pressing plate. One end of the oil needle is provided with a connecting end that is adapted to the shape of the non-circular hole. The connecting end extends into the non-circular hole. The sealing ring is provided at the other end of the oil needle. The oil needle sealing plate and the oil needle pressing plate are tightly fitted together and sleeved on the oil needle.

5. The door closing device according to claim 4, characterized in that, The piston assembly includes a piston rod, a damping sealing plate, a damping spring, a piston plate, a piston ring, and a piston protrusion. The oil needle is disposed inside the piston rod. The damping spring is sleeved on the piston rod. The damping sealing plate is sleeved on the piston rod and abuts against one end of the damping spring. The oil needle sealing plate and the oil needle pressure plate are sleeved on the piston rod, with the oil needle sealing plate abutting against the other end of the damping spring. The piston plate, the piston ring, and the piston protrusion are sequentially and tightly fitted onto the piston rod, with the piston plate adjacent to the oil needle pressure plate.

6. The door closing device according to claim 1, characterized in that, The rotation adjustment mechanism includes a rotating shaft with a tapered portion that abuts against the damping mechanism.

7. The door closing device according to claim 6, characterized in that, The rotation adjustment mechanism further includes a first bearing and a second bearing, with the first bearing sleeved on the upper part of the rotating shaft and the second bearing sleeved on the lower part of the rotating shaft.

8. The door closing device according to claim 1, characterized in that, The reset mechanism includes a spring pusher, a connecting shaft, a reset spring, and a second tail cover. One end of the spring pusher abuts against the rotary adjustment mechanism, the connecting shaft connects to the other end of the spring pusher, the reset spring is sleeved on the connecting shaft, and the second tail cover abuts against the connecting shaft.

9. The door closing device according to claim 1, characterized in that, The base mechanism includes a fixed base, an angle base, and a cover. The angle base is disposed in the fixed base, and the cover is disposed on the fixed base. The rotation adjustment mechanism extends into the cover and the angle base in sequence.

10. A door device, characterized in that, It includes a door body and a door closing device as described in any one of claims 1-9, wherein the base mechanism is disposed on the door body.

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