Slow falling mechanism with reverse slow falling and self-standing functions

Abstract

The application provides a slow-falling mechanism with reverse slow-falling and self-standing functions, which comprises a shell, a guide sleeve, a rotating shaft, an oil passing rod and a movable sleeve. The guide sleeve is arranged in the inner cavity of the shell, the rotating shaft drives the guide sleeve to reciprocate along the axial direction, the outer edge of the second end of the guide sleeve is provided with a first guide sleeve sealing ring, and the guide sleeve divides the inner cavity into a first cavity, a second cavity and a third cavity. The inner wall of the shell is provided with a boss corresponding to the opening of the sleeve hole on the second end of the guide sleeve, the inner wall of the guide sleeve forming the sleeve hole is provided with a second guide sleeve sealing ring capable of being in contact with the boss. The contact between the first guide sleeve sealing ring and the inner wall of the shell is earlier than the contact between the boss and the second guide sleeve sealing ring. The oil passing rod is arranged in the sleeve hole in a gap mode, and the two ends of the oil passing rod are connected with the boss and the rotating shaft respectively. The movable sleeve is movably arranged on the oil passing rod and can be in contact with the inner wall of the second guide sleeve sealing ring. The slow-falling mechanism can exert resistance on the opening of the cover plate.

Description

Technical Field

[0001] This invention relates to the field of rotating shaft mechanisms, and more specifically to a slow-falling mechanism with reverse slow-falling and self-standing functions. Background Technology

[0002] Rotary connectors are widely used in various fields, such as toilet seats, refrigerator doors, mobile phone covers, and cabinet doors. When used on toilet seats, traditional toilet seats are connected to the toilet body via a simple rotary connector. There is no resistance when opening or closing the toilet seat, which can easily cause the seat to slam heavily onto the toilet body when closed. This can damage the connection between the toilet seat and the toilet body, or even break the toilet seat or the toilet body itself. Therefore, a damping rotating shaft mechanism has been developed, as shown in Chinese Utility Model Patent Application No. 201420137899.7, which discloses a damping-variable rotating shaft mechanism. A key feature of this damping pivot mechanism is that it utilizes blades to function as a one-way valve. When this mechanism is applied to a toilet seat, the seat is mounted on the toilet body. When the pivot rotates in one direction, the blades close the main channel for the damping oil, allowing it to flow only through the gaps between the components of the two chambers. Consequently, the oil flows slowly from one chamber to another, resulting in a slow-closing effect. When the pivot rotates in the opposite direction, the blades do not close the main channel, allowing the oil to flow through both the main channel and the gaps between the components. This results in a faster flow from one chamber to another, creating a quick-opening effect.

[0003] However, toilet seats that use the aforementioned pivot mechanism do not offer much resistance when opening. However, due to the opening angle or inertia, most toilet seats will flip backward when opened beyond 90°, which may cause them to collide with the water tank or wall, making noise or even breaking. Summary of the Invention

[0004] To address these issues, the present invention provides a slow-falling mechanism with reverse slow-falling and self-standing functions that effectively solves the above problems.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0006] A slow-fall mechanism with reverse slow-fall and self-standing functions includes a housing, a guide sleeve, and a rotating shaft. The housing has an inner cavity filled with damping oil. The guide sleeve has a sleeve hole connecting a first end and a second end and is disposed within the inner cavity. The rotating shaft is fitted into the sleeve hole through the first end of the guide sleeve and screwed thereto. The guide sleeve is restricted to reciprocating within the housing along the axial direction of the rotating shaft. A first guide sleeve sealing ring protrudes from the outer edge of the second end of the guide sleeve. The guide sleeve divides the inner cavity into a first cavity located within the sleeve hole of the guide sleeve, a second cavity located within the first guide sleeve sealing ring, and a third cavity located outside the first guide sleeve sealing ring.

[0007] The inner wall of the outer shell has a protrusion with an opening corresponding to the sleeve hole on the second end of the guide sleeve. The inner wall of the guide sleeve forming the sleeve hole has a second guide sleeve sealing ring that can abut against the protrusion. The first guide sleeve sealing ring contacts the inner wall of the outer shell earlier than the protrusion contacts the second guide sleeve sealing ring.

[0008] It also includes an oil-passing rod and a movable sleeve. The oil-passing rod is inserted into the sleeve hole with gaps, and its two ends are respectively connected to the boss and the rotating shaft. The movable sleeve is movably sleeved on the oil-passing rod and can abut against the inner wall of the second guide sleeve sealing ring.

[0009] The slow-fall mechanism is assembled on a lid (such as a toilet seat). The opening operation of the lid drives the rotating shaft to rotate, which in turn drives the second end of the guide sleeve to approach the inner wall of the outer shell. The second cavity located in the sealing ring of the first guide sleeve is squeezed, and the damping oil in the second cavity flows into the first cavity and the third cavity respectively. The flow resistance is small, and it can be opened quickly.

[0010] When the cover is opened to a certain angle, the first guide sleeve sealing ring begins to contact the inner wall of the outer shell, blocking the channels between the second and third cavities. The damping oil in the second cavity can only flow to the first cavity. As the opening continues, with the movement of the guide sleeve, the second guide sleeve sealing ring gets closer and closer to the boss, the flow gap between the second and first cavities becomes smaller and smaller, and the flow resistance becomes larger and larger, applying a damping force to the opening action of the cover plate, thus playing a buffering role. This achieves a buffering effect, preventing or reducing the impact force of the cover plate collision; effectively solving the problems in the background technology.

[0011] During the closing process, the closing drive shaft of the cover plate rotates in the opposite direction, thereby driving the second end of the guide sleeve away from the inner wall of the outer shell. The first cavity is compressed and the second cavity is expanded. The movable sleeve is driven by hydraulic pressure to one end close to the second cavity. At this time, the movable sleeve and the sealing ring of the second guide sleeve are sealed together to block the oil passage. The damping force generated increases, thereby enabling the cover plate to stand up during the process (i.e., to be in a self-standing state).

[0012] As the cover continues to close, the movement of the guide sleeve causes the second guide sleeve sealing ring to disengage from the movable sleeve, the channel is opened, the damping oil in the first cavity can flow normally, the self-standing state is released, and the cover can fall normally.

[0013] More preferably, the guide sleeve has a first sleeve section near its first end and a second sleeve section near its second end. The first sleeve section has an internal thread, and the rotating shaft has an external thread. The rotating shaft is inserted into the first sleeve section through the first end of the guide sleeve and is screwed into the internal thread of the first sleeve section through the external thread. The second guide sleeve sealing ring is formed in the second sleeve section.

[0014] In a further preferred embodiment, the diameter of the second set of holes is smaller than the diameter of the first set of holes.

[0015] More preferably, the second guide sleeve sealing ring is inclined toward the first end of the guide sleeve.

[0016] More preferably, the movable sleeve has a first straight section and a second straight section with different outer diameters, the outer diameter of the first straight section being larger than the outer diameter of the second straight section, and the movable sleeve abutting against the inner wall of the second guide sleeve sealing ring through the first straight section.

[0017] In a further preferred embodiment, the transition surface between the first straight segment and the second straight segment is an inclined transition surface.

[0018] More preferably, the oiling rod is provided with a limiting step for restricting the range of motion of the movable sleeve.

[0019] More preferably, the inner wall of the outer shell corresponding to the outer peripheral surface of the guide sleeve is defined as the inner cavity sidewall, and the inner wall of the outer shell corresponding to the second end of the guide sleeve is defined as the inner cavity bottom wall. The inner cavity bottom wall has a protruding outer shell sealing ring, and the outer diameter of the outer shell sealing ring is equal to the inner diameter of the first guide sleeve sealing ring.

[0020] More preferably, the inner wall of the outer shell corresponding to the outer peripheral surface of the guide sleeve is defined as the inner cavity sidewall, and the inner wall of the outer shell corresponding to the second end of the guide sleeve is defined as the inner cavity bottom wall. The inner cavity sidewall extends inward at one end near the inner cavity bottom wall to form a contact inner wall with the same outer diameter as the outer shell sealing ring.

[0021] More preferably, the third cavity has a first cavity near the second cavity and a second cavity away from the second cavity. The guide sleeve is provided with a first channel connecting the first cavity and the second cavity along the axial direction, and also includes a blade. The blade is movably mounted on the guide sleeve and is located on the side of the first channel near the second cavity to close or open the first channel. A second channel for connecting the first cavity and the second cavity is also provided between the guide sleeve and the outer shell. The flow cross section of the second channel is smaller than the flow cross section of the first channel.

[0022] The technical solution provided by this invention has the following beneficial effects:

[0023] The slow-fall mechanism of this solution, featuring reverse slow-fall and self-standing functions, provides a buffering effect after opening to a certain angle, enabling reverse slow-fall to prevent or reduce the impact force of the cover plate, effectively solving the problems in the background technology. Simultaneously, during the closing process, it also has a self-standing state and a de-self-standing state, facilitating the fixation of the cover plate. Attached Figure Description

[0024] Figure 1 The diagram shown is an exploded view of the slow-fall mechanism with reverse slow-fall and self-standing functions in Embodiment 1.

[0025] Figure 2 The diagram shown is a schematic diagram of the guide sleeve in Embodiment 1;

[0026] Figure 3 The diagram shown is a structural schematic of the movable sleeve in Embodiment 1;

[0027] Figure 4 The diagram shown is a structural schematic of the outer shell in Embodiment 1;

[0028] Figure 5 The diagram shows the state of the slow-fall mechanism with reverse slow-fall and self-standing functions in Embodiment 1 when the cover is open. Figure 1 ;

[0029] Figure 6 The diagram shows the state of the slow-fall mechanism with reverse slow-fall and self-standing functions in Embodiment 1 when the cover is open. Figure 2 ;

[0030] Figure 7 The diagram shows the state of the slow-fall mechanism with reverse slow-fall and self-standing functions in Embodiment 1 when the cover is open. Figure 3 ;

[0031] Figure 8 The diagram shows the state of the slow-fall mechanism with reverse slow-fall and self-standing functions in Embodiment 1 when the cover is closed. Figure 1 ;

[0032] Figure 9 The diagram shows the state of the slow-fall mechanism with reverse slow-fall and self-standing functions in Embodiment 1 when the cover is closed. Figure 2 ;

[0033] Figure 10 The diagram shown is a structural schematic of the outer shell in Embodiment 2;

[0034] Figure 11 The diagram shown is a schematic diagram of the slow-fall mechanism with reverse slow-fall and self-standing functions in Embodiment 2. Detailed Implementation

[0035] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0036] In this embodiment, the angles (such as 0°, 70°, 90°, 110°, etc.) refer to the angle at which the cover is opened. 0° means that the cover is closed and not yet opened.

[0037] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] Reference Figures 1 to 9 As shown, this embodiment provides a slow-falling mechanism with reverse slow-falling and self-standing functions, including a housing 10, a guide sleeve 30, and a rotating shaft 20. The housing 10 has an inner cavity 1001 filled with damping oil. The guide sleeve 30 has a sleeve hole 31 connecting a first end and a second end and is disposed in the inner cavity 1001. The rotating shaft 20 is fitted into the sleeve hole 31 of the guide sleeve 30 through the first end and screwed thereto. Specifically, the sleeve hole 31 of the guide sleeve 30 includes a first sleeve hole section 301 near its first end and a second sleeve hole section 302 near its second end. The first sleeve hole section 301 has an internal thread (not shown), and the rotating shaft 20 has an external thread (not shown). The rotating shaft 20 is fitted into the first sleeve hole section 301 through the first end of the guide sleeve 30, and the external thread is screwed into the internal thread of the first sleeve hole section 301.

[0040] The guide sleeve 30 is restricted to reciprocating within the housing 10 along the axis of the rotating shaft 20. Specifically, a plurality of first ribs 33 are provided on the outer wall of the guide sleeve 30, and a plurality of second ribs (not shown) are provided on the inner wall of the housing 10. The first ribs 33 and the second ribs are misaligned to prevent the guide sleeve 30 from rotating circumferentially relative to the housing 10.

[0041] The inner wall of the outer shell corresponding to the outer peripheral surface of the guide sleeve 30 is defined as the inner cavity sidewall, and the inner wall of the outer shell corresponding to the second end of the guide sleeve 30 is defined as the inner cavity bottom wall. Therefore, the rotation of the rotating shaft 20 can drive the second end of the guide sleeve 30 to approach or move away from the inner cavity bottom wall.

[0042] The outer edge of the second end of the guide sleeve 30 is provided with a first guide sleeve sealing ring 321. The guide sleeve 30 divides the inner cavity into a first cavity 101 located in the sleeve hole 31 of the guide sleeve 30, a second cavity 102 located in the first guide sleeve sealing ring 321, and a third cavity 103 located outside the first guide sleeve sealing ring 321.

[0043] The first cavity 101 is the sleeve hole 31 of the guide sleeve 30. Since the first end of the guide sleeve 30 is blocked by the rotating shaft 20, the first cavity 101 only has an opening located at the second end of the guide sleeve 30.

[0044] The inner wall of the outer casing 10 has a protrusion 11 corresponding to the opening of the sleeve hole 31 at the second end of the guide sleeve 30. That is, the protrusion 11 is provided on the bottom wall of the inner cavity. The inner wall of the guide sleeve 30 forming the sleeve hole 31 has a second guide sleeve sealing ring 322 protruding into the sleeve hole 31, which can abut against the protrusion 11. The second guide sleeve sealing ring 322 is formed in the second sleeve hole section 302.

[0045] The first guide sleeve sealing ring 321 contacts the inner wall of the outer shell earlier than the contact between the boss 11 and the second guide sleeve sealing ring 322. Specifically, in this embodiment, the bottom wall of the inner cavity has a protruding outer shell sealing ring 12, the outer diameter of which is equal to the inner diameter of the first guide sleeve sealing ring 321, so that the inner wall surface of the first guide sleeve sealing ring 321 can fit against the outer wall surface of the outer shell sealing ring 12 to block the channel between the second cavity 102 and the third cavity 103. During the movement of the guide sleeve 30 near the bottom wall of the inner cavity, the contact between the first guide sleeve sealing ring 321 and the outer shell sealing ring 12 occurs earlier than the contact between the boss 11 and the second guide sleeve sealing ring 322. That is, the channel between the second cavity 102 and the third cavity 103 closes earlier than the channel between the second cavity 102 and the first cavity 101, but later than the channel between the second cavity 102 and the first cavity 101 opens.

[0046] It also includes an oil-passing rod 40 and a movable sleeve 50. The oil-passing rod 40 is inserted into the sleeve hole 31 with a gap, and its two ends are respectively connected to the boss 11 and the rotating shaft 20. The connection method is to form a rotatable connection with at least one of them (boss 11 or rotating shaft 20) so as not to affect the rotation of the rotating shaft 20. The movable sleeve 50 is movably sleeved on the oil-passing rod 40 and can abut against the inner wall of the second guide sleeve sealing ring 322.

[0047] In practical application, this slow-fall mechanism is mounted on a toilet seat (such as a toilet seat). The opening of the seat causes the rotating shaft 20 to rotate, which in turn drives the second end of the guide sleeve 30 to move closer to the inner wall of the outer shell, that is, closer to the bottom wall of the inner cavity. Figure 5As shown, the movement to the left compresses the second cavity 102 within the first guide sleeve sealing ring 321, while expanding the first cavity 101 and the third cavity 103. The damping oil in the second cavity 102 flows into the first cavity 101 and the third cavity 103 respectively, resulting in low flow resistance and enabling rapid opening. At this time, the movable sleeve 50 is pushed to the rightmost end by the flowing damping oil.

[0048] When opened to a certain angle, such as 70°, as Figure 6 As shown, the guide sleeve 30 moves to the left until the first guide sleeve sealing ring 321 begins to contact the outer shell sealing ring 12, thereby closing the channel between the second cavity 102 and the third cavity 103. This channel is blocked, and the damping oil in the second cavity 102 can only flow to the first cavity 101. During the continued opening process, as... Figure 7 As shown, as the guide sleeve 30 continues to move, the second guide sleeve sealing ring 322 gets closer and closer to the boss 11, the flow gap between the second cavity 102 and the first cavity 101 gets smaller and smaller, and the flow resistance gets larger and larger. This applies a damping force to the opening action of the cover plate, which plays a buffering role and realizes a reverse slow descent, so as to prevent the cover plate from colliding or reduce the force of the cover plate collision, and prevent abnormalities such as collision noise or even damage caused by large collision force; effectively solving the problems in the prior art.

[0049] During the closing process, the closing drive shaft of the cover plate rotates in the opposite direction, thereby driving the second end of the guide sleeve 30 away from the inner wall of the housing. Figure 8 As shown, the guide sleeve 30 moves to the right, the first cavity 101 is compressed while the second cavity 102 expands. The damping oil in the first cavity 101 flows into the second cavity 102 through the gap between the second sleeve orifice section 302 and the oil passage rod 40. The movable sleeve 50 is driven by oil pressure to one end closer to the second cavity 102, i.e., the leftmost end in the figure. At this time, the movable sleeve 50 and the second guide sleeve sealing ring 322 are sealed together, blocking the oil passage and preventing the damping oil in the first cavity 101 from flowing to other cavities. At this time, because the guide sleeve 30 has a tendency to move to the right, the second cavity 102 begins to form a negative pressure, which generates an adsorption force on the guide sleeve 30, preventing the guide sleeve from moving further to the right. If the cover plate is at a vertical position of 90° at this time, the gravitational torque generated by the center of gravity is small. The negative pressure of the second cavity 102 can overcome this gravitational torque, so that the cover plate stays at a position of 90°, achieving a self-standing (i.e., in a self-standing state) effect to fix the cover plate.

[0050] As the cover continues to close, such as when it is closed to a position of approximately 70°-75°, Figure 9As shown, the movement of the guide sleeve 30 causes the second guide sleeve sealing ring 322 to disengage from the movable sleeve 50, opening the channel between the first cavity 101 and the second cavity 102; at the same time, the first guide sleeve sealing ring 321 also begins to separate from the outer shell sealing ring 12, so that the channel between the second cavity 102 and the third cavity 103 is also opened, allowing the damping oil between the three cavities to flow normally, the self-standing state is released, and the cover plate can fall normally.

[0051] Specifically, in this embodiment, the third cavity 103 has a first cavity 1031 near the second cavity 102 and a second cavity 1032 away from the second cavity 102. The guide sleeve 30 is provided with a first channel (not shown) connecting the first cavity 1031 and the second cavity 1032 along the axial direction, and also includes a blade 60, which is movably mounted on the guide sleeve 30 to close or open the first channel. A second channel (not shown) is also provided between the guide sleeve 30 and the outer shell 10 to connect the first cavity 1031 and the second cavity 1032. The flow cross-section of the second channel is smaller than that of the first channel. When the cover is opened, the space of the second cavity 1032 increases, and the damping oil in the third cavity 103 flows from the first cavity 1031 to the second cavity 1032. The flowing damping oil will push the blade 60 toward the second cavity 1032. The movement of blade 60 opens the first channel, allowing damping oil to flow simultaneously through both the first and second channels to the second cavity 1032, creating an undamped state for easy and rapid opening of the cover. However, when the cover closes to its self-standing position, i.e., the first guide sleeve sealing ring 321 begins to separate from the outer shell sealing ring 12, opening the channel between the second cavity 102 and the third cavity 103, the second cavity 1032 is compressed, causing the damping oil within it to flow towards the first cavity 1031. The flowing damping oil pushes blade 60 towards the first cavity 1031, closing the first channel and creating a damped state. At this point, the damping oil can only flow along the second channel from the second cavity 1032 to the first cavity 1031, significantly reducing the flow cross-section and obstructing the flow, generating a large damping force, thus achieving a slow closing of the cover.

[0052] Specifically, the structure and arrangement of the first cavity 1031, the second cavity 1032, the first channel, the blade 60, and the second channel can all refer to the structure disclosed in the damping-changing rotating shaft mechanism disclosed in Chinese Utility Model Patent Application No. 201420137899.7. The first cavity 1031 and the second cavity 1032 of this solution are equivalent to the first and second cavities in the published document. This is already known to those skilled in the art and will not be described in detail here.

[0053] Of course, in other embodiments, the structure for achieving the slow descent of the cover plate is not limited to the one described above.

[0054] Furthermore, in this embodiment, the aperture of the second set of orifice 302 is smaller than the aperture of the first set of orifice 301. This effectively increases the flow rate of the damping oil flowing from the first cavity 101 to the second cavity 102, enabling better propulsion of the movable sleeve 50. Of course, in other embodiments, as long as it does not affect the propulsion of the movable sleeve 50, the aperture of the second set of orifice 302 can be equal to or even larger than the aperture of the first set of orifice 301.

[0055] In a further preferred embodiment, the second guide sleeve sealing ring 322 is inclined toward the first end of the guide sleeve. With this configuration, when the damping oil flows from the second cavity 102 to the first cavity 101 (i.e., during the opening process), the inclined second guide sleeve sealing ring 322, under the pressure of the damping oil, deforms the inner wall of the guide sleeve 30, increasing the effective diameter of the sleeve hole 31 to a certain extent and preventing a sealing fit between the second guide sleeve sealing ring 322 and the movable sleeve 50. When the damping oil flows from the first cavity 101 to the second cavity 102 (i.e., during the closing process), the inclined second guide sleeve sealing ring 322, under the pressure of the damping oil, deforms again toward the center of the sleeve hole 31, further reducing the effective diameter of the sleeve hole 31. During the self-standing phase, it can better seal with the movable sleeve 50, resulting in greater damping force. When the self-standing phase is released, the movement of the guide sleeve 30 moves the second guide sleeve sealing ring 322 away from the movable sleeve 50, without substantially affecting the flow of damping oil. Of course, in other embodiments, the second guide sleeve sealing ring 322 may also extend inward perpendicular to the inner wall of the guide sleeve.

[0056] In a further preferred embodiment, the movable sleeve 50 has a first straight section 51 and a second straight section 52 with different outer diameters. The outer diameter of the first straight section 51 is larger than that of the second straight section 52. The movable sleeve 50 achieves a seal by abutting against the inner wall of the second guide sleeve sealing ring 322 through the first straight section 51. The duration of engagement with the second guide sleeve sealing ring 322 is adjusted by setting the length of the first straight section 51, thereby adjusting the angle at which the self-standing state is released. More specifically, the transition surface between the first straight section 51 and the second straight section 52 is an inclined transition surface, which has a guiding function, allowing the movable sleeve 50 to transition better with the second guide sleeve sealing ring 322 and preventing it from getting stuck.

[0057] In a further preferred embodiment, the oiling rod 40 is provided with a limiting step (not shown) for limiting the range of motion of the movable sleeve 50, so as to limit the range of motion of the movable sleeve 50 and enable the movable sleeve 50 to perform its actions better.

[0058] Example 2

[0059] This embodiment provides a slow-falling mechanism with reverse slow-falling and self-standing functions, which is structurally similar to that of Embodiment 1, except that: (Refer to...) Figure 10 , Figure 11 As shown, in this embodiment, the inner cavity sidewall extends inward at one end near the bottom wall of the inner cavity to form a contact inner wall 13 with an outer diameter equal to that of the outer shell sealing ring 12. During the opening of the cover, the guide sleeve 30 moves to the left until the first guide sleeve sealing ring 321 begins to contact the contact inner wall 13, thereby sealing the channel between the second cavity 102 and the third cavity 103, specifically as follows: Figure 11 As shown, it can achieve the same technical effect, and the structure is simpler to form.

[0060] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A slow-falling mechanism with reverse slow-falling and self-standing functions, comprising a housing, a guide sleeve, and a rotating shaft, wherein the housing has an inner cavity filled with damping oil, the guide sleeve has a sleeve hole connecting a first end and a second end and is disposed within the inner cavity, the rotating shaft is sleeved into the sleeve hole of the guide sleeve through the first end and screwed thereto, and the guide sleeve is restricted to reciprocating only within the housing along the axial direction of the rotating shaft; characterized in that: The outer edge of the second end of the guide sleeve is provided with a first guide sleeve sealing ring. The guide sleeve divides the inner cavity into a first cavity located inside the sleeve hole of the guide sleeve, a second cavity located inside the first guide sleeve sealing ring, and a third cavity located outside the first guide sleeve sealing ring. The inner wall of the outer shell has a protrusion with an opening corresponding to the sleeve hole on the second end of the guide sleeve. The inner wall of the guide sleeve forming the sleeve hole has a second guide sleeve sealing ring that can abut against the protrusion. The first guide sleeve sealing ring contacts the inner wall of the outer shell earlier than the protrusion contacts the second guide sleeve sealing ring. It also includes an oil-passing rod and a movable sleeve. The oil-passing rod is inserted into the sleeve hole with gaps, and its two ends are respectively connected to the boss and the rotating shaft. The movable sleeve is movably sleeved on the oil-passing rod and can abut against the inner wall of the second guide sleeve sealing ring. The slow-fall mechanism is mounted on the cover plate. The opening operation of the cover plate drives the rotating shaft to rotate, which in turn drives the second end of the guide sleeve to approach the inner wall of the outer shell. The second cavity located in the sealing ring of the first guide sleeve is squeezed, while the first cavity and the third cavity are expanded. The damping oil in the second cavity flows into the first cavity and the third cavity respectively. When it is opened to a certain angle, the guide sleeve moves to the point that the sealing ring of the first guide sleeve begins to contact the sealing ring of the outer shell, thereby closing the channel between the second cavity and the third cavity. This channel is blocked, and the damping oil in the second cavity can only flow into the first cavity. During the continued opening process, as the guide sleeve continues to move, the sealing ring of the second guide sleeve gets closer and closer to the boss, the flow gap between the second cavity and the first cavity gets smaller and smaller, the flow resistance gets larger and larger, and a damping force is applied to the opening action of the cover plate. The closing of the cover plate drives the rotating shaft to rotate in the opposite direction, thereby driving the second end of the guide sleeve away from the inner wall of the outer shell. The first cavity is compressed and the second cavity is expanded. The damping oil in the first cavity flows into the second cavity through the gap between the second sleeve orifice and the oil passage rod. The movable sleeve is driven by oil pressure to one end close to the second cavity. At this time, the movable sleeve and the sealing ring of the second guide sleeve seal and block the oil passage, so that the damping oil in the first cavity cannot flow to other cavities, thus causing the second cavity to start to form a negative pressure, thereby generating an adsorption force on the guide sleeve. As the cover plate continues to close, the movement of the guide sleeve causes the sealing ring of the second guide sleeve to disengage from the movable sleeve, and the channel between the first cavity and the second cavity is opened. At the same time, the sealing ring of the first guide sleeve and the sealing ring of the outer shell also begin to separate, so that the channel between the second cavity and the third cavity is also opened, and the damping oil can flow normally between the three cavities.

2. The slow-falling mechanism with reverse slow-falling and self-standing functions according to claim 1, characterized in that: The guide sleeve has a first sleeve section near its first end and a second sleeve section near its second end. The first sleeve section has an internal thread, and the rotating shaft has an external thread. The rotating shaft is inserted into the first sleeve section through the first end of the guide sleeve and is screwed into the internal thread of the first sleeve section through the external thread. The second guide sleeve sealing ring is formed in the second sleeve section.

3. The slow-falling mechanism with reverse slow-falling and self-standing functions according to claim 2, characterized in that: The diameter of the second set of holes is smaller than that of the first set of holes.

4. The slow-falling mechanism with reverse slow-falling and self-standing functions according to claim 1, characterized in that: The second guide sleeve sealing ring is inclined toward the first end of the guide sleeve.

5. The slow-falling mechanism with reverse slow-falling and self-standing functions according to claim 1, characterized in that: The movable sleeve has a first straight section and a second straight section with different outer diameters. The outer diameter of the first straight section is larger than that of the second straight section. The movable sleeve abuts against the inner wall of the sealing ring of the second guide sleeve through the first straight section.

6. The slow-falling mechanism with reverse slow-falling and self-standing functions according to claim 5, characterized in that: The transition surface between the first straight segment and the second straight segment is an inclined transition surface.

7. The slow-falling mechanism with reverse slow-falling and self-standing functions according to claim 1, characterized in that: The oiling rod is provided with a limiting step to restrict the range of motion of the movable sleeve.

8. The slow-falling mechanism with reverse slow-falling and self-standing functions according to claim 1, characterized in that: The inner wall of the outer shell corresponding to the outer peripheral surface of the guide sleeve is defined as the inner cavity side wall, and the inner wall of the outer shell corresponding to the second end of the guide sleeve is defined as the inner cavity bottom wall. The inner cavity bottom wall has a protruding outer shell sealing ring, and the outer diameter of the outer shell sealing ring is equal to the inner diameter of the first guide sleeve sealing ring.

9. The slow-falling mechanism with reverse slow-falling and self-standing functions according to claim 1, characterized in that: The inner wall of the outer shell corresponding to the outer peripheral surface of the guide sleeve is defined as the inner cavity sidewall, and the inner wall of the outer shell corresponding to the second end of the guide sleeve is defined as the inner cavity bottom wall. The inner cavity sidewall extends inward at one end near the inner cavity bottom wall to form a contact inner wall with the same outer diameter as the outer shell sealing ring.

10. The slow-falling mechanism with reverse slow-falling and self-standing functions according to claim 1, characterized in that: The third cavity has a first cavity near the second cavity and a second cavity away from the second cavity. The guide sleeve is provided with a first channel that connects the first cavity and the second cavity along the axial direction. It also includes blades, which are movably mounted on the guide sleeve and located on the side of the first channel near the second cavity to close or open the first channel. A second channel is provided between the guide sleeve and the outer shell to connect the first cavity and the second cavity. The flow cross section of the second channel is smaller than that of the first channel.

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