A toilet lid and its backrest damping mechanism

Abstract

The present application relates to the technical fields of toilet cover damping mechanism, especially to a toilet cover and its backward tilting damping mechanism, comprising a rotating shaft, a shaft sleeve, a top limiting piece, a bottom limiting piece and at least two damping bags; the shaft sleeve is coaxially arranged with the rotating shaft, and the rotating shaft is partially inserted into the shaft sleeve; the top limiting piece is fixedly connected to the part of the rotating shaft inside the shaft sleeve, and the top limiting piece can move between the first limit position and the second limit position with the rotation of the rotating shaft; the bottom limiting piece is fixedly connected to the part of the rotating shaft inside the shaft sleeve. The present application utilizes the top limiting piece and the bottom limiting piece which are rotated with the rotating shaft and cooperated with the two damping bags, so that the two damping bags can generate damping force on the toilet cover during the opening or closing process, preventing the toilet cover from impacting the water tank or the toilet.

Description

Technical Field

[0001] This invention relates to the field of toilet seat damping mechanism technology, specifically a toilet seat and its tilting damping mechanism. Background Technology

[0002] One of the main functions of a toilet seat is to provide hygiene protection. When the toilet is not in use, closing the toilet seat can effectively prevent bacteria and odors from spreading into the air, avoiding contamination of the bathroom environment. In addition, closing the toilet seat when flushing can prevent bacteria from splashing, thus protecting the user's health.

[0003] To prevent toilet seats from hitting the toilet bowl due to their own weight during the closing process, current toilet seats use a rotary damper to achieve the hinge between the toilet seat and the toilet. The advantage of using a rotary damper is that the toilet seat closes slowly and evenly due to the damping force generated during the rotation of the rotary damper, thus preventing the toilet seat from hitting the toilet bowl.

[0004] For example, Chinese patent document CN202215102U discloses a lightweight toilet seat damper, including a housing and damping oil encapsulated within the housing. The housing contains a shaft and a connecting shaft connected to the shaft. The shaft is characterized by having at least one axially oriented stop extending to the inner wall of the housing. The shaft has a first flow hole and a second flow hole perpendicularly distributed to each other. A sealing cavity is provided at the end of the housing. This invention features a simple structure, good damping effect, and long service life.

[0005] Therefore, it can be seen that the rotary damper used to connect the toilet seat and the toilet in the relevant technology still has the following shortcomings in use:

[0006] First, the rotary damper in the relevant technology has a damping force throughout the entire rotation process. Specifically, during the entire process of opening or closing the toilet seat, the toilet seat is restricted by the damping force generated by the rotation of the rotary damper, resulting in a slow opening and closing speed. In some emergency situations, in order to increase the opening speed of the toilet seat, the user will manually intervene in the opening process of the toilet seat, which will cause the rotary damper to rotate a large angle in a short period of time. The internal oil pressure of the rotary damper will increase instantaneously, which can easily cause the rotary damper to be damaged due to excessive oil pressure.

[0007] Secondly, the current rotary damper is a non-removable design. Once the rotary damper is damaged, a brand new rotary damper needs to be purchased for replacement, which increases the user's operating costs. Summary of the Invention

[0008] The purpose of this invention is to provide a toilet seat and its tilting damping mechanism to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A pitching damping mechanism, comprising:

[0011] Shaft;

[0012] A bushing, which is coaxially arranged with the rotating shaft, and the rotating shaft is partially inserted into the bushing;

[0013] A top limiting member is fixedly connected to the portion of the rotating shaft located inside the bushing, and the top limiting member can move between a first limit position and a second limit position as the rotating shaft rotates.

[0014] A bottom limiting member is fixedly connected to the portion of the rotating shaft located inside the bushing, and the bottom limiting member can move between a third limit position and a fourth limit position as the rotating shaft rotates.

[0015] At least two damping bladders, each damping bladder comprising a first cavity and a second cavity connected by a rectangular cavity and having equal volumes after expansion, and an elastic partition disposed inside the rectangular cavity to separate the first cavity and the second cavity. The two rectangular cavities are symmetrically fixed on both sides of the inner side of the circular hole of the bushing. The damping bladder is filled with liquid, and the volume of the liquid is equal to the sum of the volumes of the first cavity and the rectangular cavity.

[0016] When the top limiting member rotates to the first limit position to compress the first cavity of one of the damping bladders, the bottom limiting member rotates to the fourth limit position to compress the second cavity of the other damping bladder; when the top limiting member rotates to the second limit position to compress the second cavity of one of the damping bladders, the bottom limiting member rotates to the third limit position to compress the first cavity of the other damping bladder.

[0017] Preferably, two fixing plates are symmetrically fixed to the inner wall of the circular hole;

[0018] The fixing plate has a cantilevered portion formed by a strip groove on its end face, and the rectangular cavity is fitted inside the strip groove so that the first cavity and the second cavity are symmetrically attached to the upper and lower sides of the cantilevered portion.

[0019] Preferably, a fixing block is fixedly connected to each of the two opposite side walls of the rectangular cavity;

[0020] The elastic spacer is vertically disposed between the two fixed blocks, and the top end of the elastic spacer is fixed to one of the fixed blocks;

[0021] The bushing is provided with an adjustment component for adjusting the distance between the two side walls.

[0022] Preferably, the adjusting component includes a screw and an equalizing plate;

[0023] The axial direction of the screw is perpendicular to the sidewall;

[0024] The equalization plate is inserted into the inside of the strip groove, and a sliding plate is fixedly connected to the top of the equalization plate. The lower surface of the sliding plate is in sliding contact with the upper surface of the fixed plate.

[0025] One end of the screw is rotatably connected to the equalization plate, and the other end extends through to the outside of the bushing;

[0026] A protective sleeve is fixed to the outer surface of the bushing, and the portion of the screw located outside the bushing is disposed inside the protective sleeve.

[0027] Preferably, a rectangular sleeve is fitted on the outer side of the overhang;

[0028] The rectangular sleeve is formed by two horizontal walls and two vertical walls arranged opposite to each other.

[0029] The rectangular cavity is sandwiched between one of the vertical walls and the equalization plate, and the equalization plate and one of the vertical walls are respectively fixedly connected to the two side walls;

[0030] The bottom surface of the first cavity and the top surface of the second cavity are respectively fixedly connected to two horizontal walls.

[0031] Preferably, the top limiting member includes a closed cover baffle and an open cover baffle fixedly connected to the rotating shaft, and a first connecting plate fixedly connected between the closed cover baffle and the open cover baffle.

[0032] Preferably, the bottom limiting component includes two symmetrically arranged bottom limiting plates, an arc-shaped plate fixedly connected between the two bottom limiting plates, and a second connecting plate fixedly connected between the arc-shaped plate and the rotating shaft.

[0033] Preferably, the rotating shaft includes a main shaft integrally formed, a first irregularly shaped shaft, and a second irregularly shaped shaft;

[0034] The inside of the bushing is rotatably connected to a transmission sleeve via a bearing, and the transmission sleeve has an insertion hole that mates with the first irregular shaft.

[0035] Preferably, protruding strips are provided on the two adjacent sides of the two horizontal walls;

[0036] The upper and lower sides of the overhang are provided with positioning grooves that match the protrusions.

[0037] A toilet seat comprising the aforementioned tilting damping mechanism.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] This invention utilizes two damping bladders in conjunction with top and bottom limiting components that rotate with the pivot. This ensures that both damping bladders exert damping force on the toilet seat during opening and closing, preventing the seat from impacting the tank or toilet bowl. Furthermore, the coordination between the various structures ensures that the damping bladders do not exert damping force on the toilet seat initially during opening or closing, allowing for quick and easy operation. Additionally, the use of liquid-filled damping bladders eliminates the need for the high-precision sealing structure of traditional rotary dampers, resulting in lower overall production costs. When a damping bladder is damaged, only a new one needs to be replaced, while components such as the pivot and bushings can be reused, further reducing user costs. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 This is a schematic diagram of the right-side structure of the present invention;

[0042] Figure 3 This is a schematic diagram of the left-side structure of the present invention;

[0043] Figure 4 This is a structural schematic diagram of the rotating shaft, top limiting member, and bottom limiting member of the present invention;

[0044] Figure 5 This is a cross-sectional three-dimensional structural schematic diagram of the bushing of the present invention;

[0045] Figure 6 For the present invention Figure 5 A partial structural diagram;

[0046] Figure 7 This is a schematic diagram of the right-side cross-sectional structure of the present invention;

[0047] Figure 8 For the present invention Figure 7 A partial structural diagram;

[0048] Figure 9 This is a cross-sectional structural schematic diagram of the damping bladder of the present invention;

[0049] Figure 10 This is a cross-sectional view of the rectangular sleeve of the present invention.

[0050] In the diagram: 1. Rotating shaft; 11. Main shaft; 12. First irregular shaft; 13. Second irregular shaft; 2. Bushing; 21. Circular hole; 22. Fixing plate; 221. Strip groove; 222. Overhang; 223. Positioning groove; 3. Top limiting component; 31. Closing baffle; 32. Opening baffle; 33. First connecting plate; 4. Bottom limiting component; 41. Bottom limiting plate; 42. Second connecting plate; 43. Arc plate; 5. Damping bladder; 51. First cavity; 52. Second cavity; 53. Rectangular cavity; 531. Side wall; 532. Fixing block; 533. Elastic partition; 6. Rectangular sleeve; 61. Horizontal wall; 611. Protruding strip; 62. Vertical wall; 7. Adjusting component; 71. Screw; 72. Equalizing plate; 73. Slide plate; 74. Protective sleeve; 8. Transmission sleeve; 81. Bearing; 82. Insertion hole. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Please see Figures 1-10 The present invention provides a technical solution:

[0053] A pitching damping mechanism includes a pivot 1, a bushing 2, a top limiting member 3, a bottom limiting member 4, and at least two damping bladders 5. The following is a detailed description of these components that make up the pitching damping mechanism.

[0054] The rotating shaft 1 includes a main shaft 11, a first irregular shaft 12, and a second irregular shaft 13, all integrally formed. The specific materials of the main shaft 11, the first irregular shaft 12, and the second irregular shaft 13 are not limited and can be made of plastic. The main shaft 11 is cylindrical in shape and is used to fix the top limiting member 3 and the bottom limiting member 4. In this example, the top limiting member 3 and the bottom limiting member 4 are fixedly connected to the main shaft 11 by integral forming. In other embodiments, other fixing connection methods (such as welding) can also be used. The cross-sectional shape of the first irregular shaft 12 and the second irregular shaft 13 is not completely circular, which facilitates the transmission of force. For example, during use, the toilet seat and the second irregular shaft 13 are fixedly connected. At this time, a sleeve matching the shape of the second irregular shaft 13 can be set on the toilet seat. During installation, the second irregular shaft 13 is simply inserted into the sleeve, which will drive the second irregular shaft 13 and even the entire rotating shaft 1 to rotate when the toilet seat is opened or closed.

[0055] The bushing 2 is coaxially arranged with the rotating shaft 1, and the rotating shaft 1 is partially inserted into the bushing 2. Specifically, in this embodiment, the main shaft 11 and the first irregular shaft 12 are inserted into the bushing 2, and the second irregular shaft 13 is located outside the bushing 2. In actual use, the bushing 2 is fixedly connected to the seat ring, and the second irregular shaft 13 is fixedly connected to the cover plate.

[0056] The top limiting member 3 is fixedly connected to the portion of the rotating shaft 1 located inside the bushing 2. The top limiting member 3 includes a closed cover baffle 31 and an open cover baffle 32 fixedly connected to the rotating shaft 1, and a first connecting plate 33 fixedly connected between the closed cover baffle 31 and the open cover baffle 32. In this embodiment, the top limiting member 3 is fixedly connected to the main shaft 11, and the top limiting member 3 can move between a first limit position and a second limit position as the rotating shaft 1 rotates. The bottom limiting member 4 is fixedly connected to the portion of the rotating shaft 1 located inside the bushing 2. The bottom limiting member 4 includes two symmetrically arranged bottom limiting plates 41 and a fixed... The arc-shaped plate 43 connected between the two bottom limiting plates 41 and the second connecting plate 42 fixedly connected between the arc-shaped plate 43 and the rotating shaft 1 are included. In this embodiment, the bottom limiting member 4 is fixedly connected to the main shaft 11, and the bottom limiting member 4 can move between the third limit position and the fourth limit position as the rotating shaft 1 rotates. In this embodiment, the fixed connection method between the top limiting member 3 and the rotating shaft 1 and the fixed connection method between the bottom limiting member 4 and the rotating shaft 1 are not specifically limited. For example, the top limiting member 3 and the bottom limiting member 4 can be fixedly connected to the rotating shaft 1 in an integral molding manner.

[0057] The damping bladder 5 includes a first cavity 51 and a second cavity 52 connected by a rectangular cavity 53 and having equal volumes after expansion, and an elastic partition 533 disposed inside the rectangular cavity 53 to separate the first cavity 51 and the second cavity 52. ​​Specifically, when the first cavity 51 or the second cavity 52 is not compressed, the elastic partition 533 can separate the first cavity 51 and the second cavity 52 to prevent the liquid in the first cavity 51 from entering the interior of the second cavity 52. ​​When the first cavity 51 or the second cavity 52 is compressed, the elastic partition 533 can be elastically bent, thereby allowing the first cavity 51 and the second cavity 52 to communicate. In this embodiment, the elastic partition 533 can be made of rubber. The two rectangular cavities 53 are symmetrically fixed on both sides of the inside of the circular hole 21 of the bushing 2. The inside of the damping bladder 5 is filled with liquid. In this embodiment, the liquid can be damping oil or the like. The volume of the liquid is equal to the sum of the volumes of the first cavity 51 and the rectangular cavity 53; specifically, the volume of liquid filling each damping bladder 5 can only fill either the first cavity 51 and the rectangular cavity 53 or the second cavity 52 and the rectangular cavity 53, such as... Figure 7 and Figure 8 As shown, at this time, only the second cavity 52 and the rectangular cavity 53 of the damping bladder 5 are filled with liquid, while the first cavity 51 is in a contracted, unfilled state. If the second cavity 52 is squeezed, the liquid inside the second cavity 52 will push the elastic septum 533 to bend elastically under the pressure, opening the rectangular cavity 53 and allowing the liquid inside the second cavity 52 to flow into the first cavity 51, thereby achieving a damping effect. In this embodiment, four damping bladders 5 are provided, divided into two groups, with two damping bladders 5 in each group.

[0058] When the top limiting member 3 rotates to the first limit position (to... Figure 2 Taking the state shown as an example, the first limit position refers to the position where the closing cover baffle 31 flattens the first cavity 51 of the damping bladder 5 on the left side inside the bushing 2, so that the first cavity 51 of one of the damping bladders 5 is compressed, and the bottom limiting member 4 rotates to the fourth limit position (with the state shown as an example). Figure 2 Taking the state shown as an example, the fourth limit position refers to the position where the bottom limiting plate 41 on the right side of the second connecting plate 42 flattens the second cavity 52 of the damping bladder 5 inside the bushing 2, so that the second cavity 52 of the other damping bladder 5 is compressed; when the top limiting member 3 rotates to the second limit position (with Figure 2 Taking the state shown as an example, the second limit position refers to the position where the cover baffle 32 is flattened when the first cavity 51 of the damping bladder 5 on the right side inside the bushing 2 is pressed down, so that the second cavity 52 of one of the damping bladders 5 is compressed, and the bottom limiting member 4 rotates to the third limit position (with the state shown as an example). Figure 2Taking the state shown as an example, the third limit position refers to the position where the bottom limit plate 41 on the left side of the second connecting plate 42 presses down the second cavity 52 of the damping bladder 5 on the left side inside the bushing 2, so that the first cavity 51 of the other damping bladder 5 is compressed.

[0059] The actual working principle is as follows: The following description uses... Figure 2 The following explanation uses the states shown as examples (e.g., clockwise rotation, counterclockwise rotation, left side, right side, etc.). Figure 2 (assuming the state shown is the premise) when Figure 2When the rotating shaft 1 is rotated clockwise, causing the toilet seat to gradually open and tilt back, the opening baffle 32 of the top limiting member 3 gradually approaches the damping bladder 5 located on the right side inside the bushing 2. Simultaneously, the bottom limiting plate 41 of the bottom limiting member 4 on the left side gradually approaches the damping bladder 5 located on the left side inside the bushing 2. After the rotating shaft 1 rotates clockwise by a certain angle, the opening baffle 32 will squeeze the first cavity 51 of the damping bladder 5 on the right side inside the bushing 2, while the bottom limiting plate 41 on the left side will squeeze the second cavity 52 of the damping bladder 5 on the left side inside the bushing 2. This causes the liquid inside the damping bladders 5 on both sides to begin flowing; for example, the liquid inside the second cavity 52 of the left damping bladder 5... After the liquid pushes open the elastic partition 533, it flows through the rectangular cavity 53 into the first cavity 51 of the left damping bladder 5. Similarly, after the liquid in the first cavity 51 of the right damping bladder 5 pushes open the elastic partition 533, it flows through the rectangular cavity 53 into the second cavity 52 of the right damping bladder 5. This achieves damping and buffering during the toilet seat's backward opening process. Furthermore, during the initial stage of the clockwise rotation of the pivot 1 until the opening baffle 32 contacts the right damping bladder 5, since there is no compression of the damping bladder 5, the opening process of the toilet seat is not affected by the damping force generated by the damping bladder 5, resulting in a fast opening speed. Simultaneously, after the opening baffle 32 contacts the right damping bladder 5, the toilet seat opens quickly. When the opening angle of the toilet seat is greater than 90° with the horizontal plane, even if the hand pushing the toilet seat is released, the toilet seat will gradually compress the first cavity 51 of the right-side damping bladder 5 under its own weight, thus preventing the toilet seat from hitting the wall behind the toilet or the water tank during opening. After the toilet seat is fully opened, the first cavity 51 of the right-side damping bladder 5 inside the bushing 2 is in a contracted state, and the second cavity 52 is in an expanded state, while the first cavity 51 of the left-side damping bladder 5 inside the bushing 2 is in an expanded state, and the second cavity 52 is in a contracted state. At this time, closing the toilet seat, that is, rotating the shaft 1 counterclockwise, in the initial stage of rotation... During the contact between the closing baffle 31 and the first cavity 51 of the left damping bladder 5 inside the bushing 2, the toilet seat is not affected by the damping bladder 5. However, when the closing baffle 31 begins to squeeze the first cavity 51 of the left damping bladder 5 inside the bushing 2, the liquid in the first cavity 51 of the left damping bladder 5 will flow to the second cavity 52 of the left damping bladder 5. During this process, the bottom limiting plate 41 located on the left side of the second connecting plate 42 will squeeze the second cavity 52 of the right damping bladder 5 inside the bushing 2, causing the liquid in the second cavity 52 of the right damping bladder 5 to flow to the first cavity 51 of the right damping bladder 5. Therefore, a damping force will be generated on the closing of the toilet seat, thereby preventing the toilet seat from hitting the toilet.

[0060] In the above solution, two damping bladders 5, in conjunction with the top limiting member 3 and the bottom limiting member 4 that rotate together with the rotating shaft 1, ensure that both damping bladders 5 can generate damping force on the toilet seat during opening or closing, preventing the toilet seat from impacting the water tank or toilet during the opening or closing process. Moreover, the cooperation between the various structures of this invention ensures that the damping bladders 5 do not generate damping force on the toilet seat in the early stage of opening or closing, making it convenient for users to quickly open or close the toilet seat. At the same time, since the damping force is generated by using damping bladders 5 filled with liquid, the high-precision sealing structure of traditional rotary dampers is eliminated, resulting in low overall production costs. Furthermore, when the damping bladder 5 is damaged, only a new damping bladder 5 needs to be replaced, while components such as the rotating shaft 1 and bushing 2 can be reused, reducing the user's operating costs.

[0061] like Figures 1-10 As shown, two fixing plates 22 are symmetrically fixed to the inner wall of the circular hole 21. The fixing plates 22 are made of the same material as the bushing 2, and the two are fixed by integral molding. The fixing plates 22 have overhangs 222 formed by the strip grooves 221 opened on their end faces (e.g., Figure 6 As shown, the rectangular cavity 53 is fitted inside the strip groove 221, so that the first cavity 51 and the second cavity 52 are symmetrically attached to the upper and lower sides of the overhang 222, respectively.

[0062] like Figures 8-9 As shown, two fixing blocks 532 are fixedly connected to the two opposite sidewalls 531 of the rectangular cavity 53. The fixing blocks 532 can be made of rubber. An elastic spacer 533 is vertically arranged between the two fixing blocks 532, with the top end of the elastic spacer 533 fixed to one of the fixing blocks 532 and the bottom end of the elastic spacer 533 abutting against the other fixing block 532. Thus, when the damping bladder 5 is not compressed, the elastic spacer 533 can isolate the communication between the first cavity 51 and the second cavity 52. ​​Furthermore, the bushing 2 is provided with an adjusting component 7 for adjusting the distance between the two sidewalls 531.

[0063] like Figures 7-10As shown, the adjusting component 7 includes a screw 71 and an equalizing plate 72; the axial direction of the screw 71 is perpendicular to the side wall 531; the equalizing plate 72 is inserted into the inside of the strip groove 221, and a sliding plate 73 is fixedly connected to the top of the equalizing plate 72. The lower surface of the sliding plate 73 slides in contact with the upper surface of the fixed plate 22. When the screw 71 is rotated, the equalizing plate 72 will not rotate with the screw 71 because the lower surface of the sliding plate 73 slides in contact with the upper surface of the fixed plate 22; one end of the screw 71 is rotatably connected to the equalizing plate 72, and the other end extends through to the outside of the bushing 2. The other end of the screw 71 is fixed with a head, which allows the user to use a screwdriver or other tools to turn the screw 71 so that the screw 71 rotates; a protective sleeve 74 is fixed to the outer surface of the bushing 2. The protective sleeve 74 is made of the same material as the bushing 2 and is integrally formed with the bushing 2. The part of the screw 71 located outside the bushing 2 is located inside the protective sleeve 74.

[0064] like Figures 7 to 10 As shown, a rectangular sleeve 6 is fitted on the outer side of the cantilever 222. The material of the rectangular sleeve 6 can be the same as that of the cantilever 222, and it is detachably fitted onto the cantilever 222. The rectangular sleeve 6 is formed by two horizontal walls 61 and two vertical walls 62 arranged opposite each other. A rectangular cavity 53 is sandwiched between one of the vertical walls 62 and the equalization plate 72, and the equalization plate 72 and one of the vertical walls 62 are respectively fixedly connected to the two side walls 531. The bottom surface of the first cavity 51 and the top surface of the second cavity 52 are respectively fixedly connected to the two horizontal walls 61, so that the bottom surface of the first cavity 51 and the top surface of the second cavity 52 cannot be deformed, which is conducive to the exchange of liquid between the first cavity 51 and the second cavity 52.

[0065] like Figure 3 and Figure 5 As shown, the inside of the bushing 2 is rotatably connected to the transmission sleeve 8 via the bearing 81. The transmission sleeve 8 can be made of the same material as the bushing 2. The transmission sleeve 8 has an insertion hole 82 that is matched with the first irregular shaft 12. The first irregular shaft 12 is detachably inserted into the inside of the insertion hole 82.

[0066] The two horizontal walls 61 are provided with protruding strips 611 on their two adjacent sides; the upper and lower sides of the cantilever 222 are provided with positioning grooves 223 that match the protruding strips 611. The protruding strips 611 and the positioning grooves 223 work together to enable the rectangular sleeve 6 to be quickly fitted onto the cantilever 222.

[0067] A toilet seat comprising the aforementioned tilting damping mechanism.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tilting damping mechanism, applied to a toilet seat, characterized in that, include: Shaft; A bushing, which is coaxially arranged with the rotating shaft, and the rotating shaft is partially inserted into the bushing; A top limiting member is fixedly connected to the portion of the rotating shaft located inside the bushing, and the top limiting member can move between a first limit position and a second limit position as the rotating shaft rotates. A bottom limiting member is fixedly connected to the portion of the rotating shaft located inside the bushing, and the bottom limiting member can move between a third limit position and a fourth limit position as the rotating shaft rotates. At least two damping bladders, each damping bladder comprising a first cavity and a second cavity connected by a rectangular cavity and having equal volumes after expansion, and an elastic partition disposed inside the rectangular cavity to separate the first cavity and the second cavity. The two rectangular cavities are symmetrically fixed on both sides of the inner side of the circular hole of the bushing. The damping bladder is filled with liquid, and the volume of the liquid is equal to the sum of the volumes of the first cavity and the rectangular cavity. When the top limiting member rotates to the first limit position to compress the first cavity of one of the damping bladders, the bottom limiting member rotates to the fourth limit position to compress the second cavity of the other damping bladder; when the top limiting member rotates to the second limit position to compress the second cavity of one of the damping bladders, the bottom limiting member rotates to the third limit position to compress the first cavity of the other damping bladder. The inner wall of the circular hole is symmetrically fixed with two fixing plates; The fixing plate has a cantilevered portion formed by a strip groove on its end face, and the rectangular cavity is fitted inside the strip groove so that the first cavity and the second cavity are symmetrically attached to the upper and lower sides of the cantilevered portion respectively. A fixing block is fixedly connected to each of the two opposite side walls of the rectangular cavity; The elastic spacer is vertically disposed between the two fixed blocks, and the top end of the elastic spacer is fixed to one of the fixed blocks; The bushing is provided with an adjustment component for adjusting the distance between the two side walls.

2. The pitching damping mechanism according to claim 1, characterized in that, The adjusting components include a screw and an equalizer plate; The axial direction of the screw is perpendicular to the sidewall; The equalization plate is inserted into the inside of the strip groove, and a sliding plate is fixedly connected to the top of the equalization plate. The lower surface of the sliding plate is in sliding contact with the upper surface of the fixed plate. One end of the screw is rotatably connected to the equalization plate, and the other end extends through to the outside of the bushing; A protective sleeve is fixed to the outer surface of the bushing, and the portion of the screw located outside the bushing is disposed inside the protective sleeve.

3. The pitching damping mechanism according to claim 2, characterized in that, A rectangular sleeve is fitted on the outer side of the cantilever section; The rectangular sleeve is formed by two horizontal walls and two vertical walls arranged opposite to each other. The rectangular cavity is sandwiched between one of the vertical walls and the equalization plate, and the equalization plate and one of the vertical walls are respectively fixedly connected to the two side walls; The bottom surface of the first cavity and the top surface of the second cavity are respectively fixedly connected to two horizontal walls.

4. The pitching damping mechanism according to claim 1, characterized in that, The top limiting component includes a closed cover baffle and an open cover baffle fixedly connected to the rotating shaft, and a first connecting plate fixedly connected between the closed cover baffle and the open cover baffle.

5. A pitching damping mechanism according to claim 1, characterized in that, The bottom limiting component includes two symmetrically arranged bottom limiting plates, an arc-shaped plate fixedly connected between the two bottom limiting plates, and a second connecting plate fixedly connected between the arc-shaped plate and the rotating shaft.

6. The pitching damping mechanism according to claim 1, characterized in that, The rotating shaft includes an integrally formed main shaft, a first irregularly shaped shaft, and a second irregularly shaped shaft. The inside of the bushing is rotatably connected to a transmission sleeve via a bearing, and the transmission sleeve has an insertion hole that mates with the first irregular shaft.

7. A pitching damping mechanism according to claim 3, characterized in that, Each of the two adjacent sides of the two horizontal walls is provided with a raised strip; The upper and lower sides of the overhang are provided with positioning grooves that match the protrusions.

8. A toilet seat, characterized in that, The toilet seat includes the back-tilting damping mechanism as described in any one of claims 1-7.

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