Downward pressing one-way rotation mechanism

Abstract

The utility model discloses a kind of lower pressure one-way rotation mechanism, for rotating mop rod, comprising: fixed cover, the bottom of fixed cover is equipped with first cavity, the top wall of fixed cover is equipped with the through-hole being communicated with first cavity;Cylinder shaft, cylinder shaft is coaxially arranged on the top wall of fixed cover, the inner chamber of this cylinder shaft, through-hole and the top of first cavity jointly form second cavity;Rotary shaft, rotary shaft is set in second cavity in the way of rotating around fixed cover central axis;Lower pressure rod, the bottom end of lower pressure rod and cylinder shaft axial sliding fit, and with rotary shaft screw drive cooperation;And chuck, chuck can be rotatably arranged in first cavity, and with the bottom end of rotary shaft by one-way transmission piece one-way drive cooperation.The lower pressure one-way rotation mechanism of the utility model, user does not need to put mop rod into traditional mop bucket, only through lower pressure action can drive chuck high-speed rotation, realize centrifugal dewatering or shake off dust impurity, greatly expand application scenario and improve use convenience.

Description

Technical Field

[0001] This utility model relates to the field of cleaning tools technology, specifically to a downward pressure unidirectional rotation mechanism. Background Technology

[0002] Floor cleaning is a basic requirement for environmental maintenance, and mops, as a core cleaning tool, have become widely used. Currently, mainstream mops adopt a rotary wringing design, which drives the rotating rod on the mop handle to rotate the chuck at high speed, using centrifugal force to achieve efficient dehydration of the chuck, solving the problems of traditional mops being laborious to wring out and leaving a lot of water residue.

[0003] However, existing rotary mops have significant drawbacks: the mop bucket is usually directly and fixedly connected to or linked with the rotating rod of the mop handle. To achieve stable rotation and spin-drying of the chuck, the mop bucket must have a specially designed spin-drying seat adapted to the chuck structure. This spin-drying seat needs to have positioning, limiting, and transmission adaptation functions to ensure that the chuck does not shift or shake during high-speed spin-drying. This directly leads to: a more complex mop bucket structure, requiring the design of an adaptation structure based on the chuck size and rotation trajectory, increasing design difficulty and manufacturing costs; and dead angles such as gaps and grooves in the spin-drying seat, making it easy for wastewater and impurities spun off from the chuck to remain, which is difficult to clean with regular rinsing. Long-term use can easily breed bacteria and produce odors, significantly increasing the maintenance difficulty of the mop bucket and reducing the user experience. Utility Model Content

[0004] In view of this, the present invention proposes a downward unidirectional rotation mechanism to enable users to complete the dehydration without the need for a traditional mop bucket.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A downward unidirectional rotary mechanism, comprising:

[0007] A fixed cover, wherein a first cavity is provided inside the fixed cover, the bottom end of the first cavity is an open end, and a through hole communicating with the first cavity is provided in the center of the top wall of the fixed cover;

[0008] A cylindrical shaft is arranged coaxially around the through hole and on the top wall of the fixed cover. The inner cavity of the cylindrical shaft, the through hole, and the top of the first cavity together form a second cavity.

[0009] A rotating shaft is disposed in the second cavity in a manner that allows it to rotate about the central axis of the fixed cover;

[0010] The lower pressure rod has its bottom end placed inside the cylindrical shaft and is axially slidingly engaged with the cylindrical shaft, and is also helically driven by the rotating shaft.

[0011] And a chuck, which is rotatably disposed in the first cavity and is unidirectionally driven to the bottom end of the rotating shaft via a one-way transmission component.

[0012] To better achieve the above technical solution, optionally, the cylindrical shaft includes a fixed cylindrical body and a hinged cylindrical shaft, a fixed shaft seat is fixedly provided around the through hole on the top surface of the fixed cover, the top end of the hinged cylindrical shaft is hinged to the bottom end of the fixed cylindrical body, and the bottom end of the hinged cylindrical shaft is hinged to the fixed shaft seat.

[0013] The rotating shaft includes a helical rod, a first connecting shaft, and a second connecting shaft arranged coaxially from top to bottom. The top end of the first connecting shaft is hinged to the bottom end of the helical rod, and the bottom end of the first connecting shaft is hinged to the top end of the second connecting shaft.

[0014] Wherein, the hinged cylinder shaft is collinear with the hinged shaft of the fixed cylinder body and the hinged shaft of the helical rod is collinear with the hinged shaft of the first connecting shaft, and the hinged shaft of the hinged cylinder shaft is collinear with the hinged shaft of the fixed shaft seat and the hinged shaft of the first connecting shaft is collinear with the hinged shaft of the second connecting shaft.

[0015] Optionally, the axis of the hinge shaft between the hinge cylinder and the hinge shaft of the fixed cylinder, and the axis of the hinge shaft between the hinge cylinder and the hinge shaft of the fixed shaft seat are perpendicular to each other in space.

[0016] Optionally, the bottom end of the fixed cylinder, both ends of the hinged cylinder shaft, and the fixed shaft seat are all U-shaped fork structures.

[0017] Optionally, the pressure rod includes a hollow rod body and a drive sleeve. The drive sleeve includes an inner sleeve body and a sliding ring fixed to the outer wall of the bottom end of the inner sleeve body. The outer wall of the sliding ring is axially slidingly engaged with the inner wall of the fixed cylinder body. The inner sleeve body is fixedly fitted to the inner wall of the bottom end of the hollow rod body. The inner sleeve body has a through hole in the central axial direction that engages with the screw groove of the spiral rod for driving cooperation.

[0018] Optionally, the fixed cylinder includes an upper cylinder and a lower cylinder. The lower cylinder includes an outer cylinder section and an inner cylinder section arranged coaxially. The inner cylinder section is sleeved inside the lower section of the upper cylinder, and its outer wall is provided with two protrusions spaced apart in the circumferential direction. The lower section of the upper cylinder has a connecting hole adapted to the two protrusions. The inner cylinder section and the upper cylinder are fixedly connected by the engagement of the protrusions with the connecting hole.

[0019] Optionally, the inner wall of the upper cylinder includes a small diameter section and a large diameter section from top to bottom. The inner cylinder section is fixedly fitted inside the bottom inner wall of the large diameter section. The outer wall of the sliding ring is slidably engaged with the inner wall of the large diameter section. The stepped surfaces of the small diameter section and the large diameter section are the upper limit of the travel of the sliding ring, and the top surface of the inner cylinder section is the lower limit of the travel of the sliding ring.

[0020] Optionally, it also includes an elastic element sleeved on the outside of the screw rod, one end of which abuts against the lower top surface of the drive sleeve, and the other end of which abuts against the connecting surface of the outer cylinder section and the inner cylinder section, wherein the elastic element is configured to be compressed when the lower pressure rod moves downward and to provide an upward restoring force for the lower pressure rod.

[0021] Optionally, a bushing is provided around the through hole in the first cavity, which is fixedly connected to the inner top surface of the fixed cover and coaxial with the second connecting shaft. The bushing and the inner top surface of the fixed cover form a shaft assembly space, and the bottom end of the second connecting shaft is located in the shaft assembly space through a one-way transmission component.

[0022] Optionally, the outer edge of the fixed cover is provided with at least two radially outwardly extending feet at circumferential intervals.

[0023] The beneficial effects of this utility model are:

[0024] The downward pressure unidirectional rotation mechanism of this utility model converts linear downward pressure into rotational driving force through the linear reciprocating motion of the downward pressure rod and the helical cooperation of the rotating shaft. It also uses a unidirectional transmission component to convert bidirectional rotational input into continuous unidirectional rotational output of the chuck. This allows users to drive the chuck to rotate at high speed simply by pressing down, without having to put the mop into a traditional mop bucket, thus achieving centrifugal dehydration or removing dust and impurities. This greatly expands the application scenarios and ease of use of the product. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of a downward unidirectional rotation mechanism according to an embodiment of the present utility model;

[0026] Figure 2 yes Figure 1 Exploded view;

[0027] Figure 3 yes Figure 1 Isometric sectional view of a partial structure;

[0028] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the local structure from the first angle;

[0029] Figure 5 yes Figure 1 A three-dimensional schematic diagram of the local structure from a second angle;

[0030] Figure 6 yes Figure 1 Top view of a partial structure;

[0031] Figure 7 yes Figure 6 Sectional view along axis AA;

[0032] Figure 8yes Figure 6 BB-direction sectional view;

[0033] Figure 9 yes Figure 2 Enlarged view of the middle section structure;

[0034] Figure label:

[0035] Fixed cover 10, first cavity 101, through hole 102, fixed shaft seat 103, support foot 104, cylindrical shaft 20, upper cylindrical body 21, connecting hole 211, small diameter section 212, large diameter section 213, lower cylindrical body 22, outer cylindrical section 221, inner cylindrical section 222, protrusion 223, hinged cylindrical shaft 23, rotating shaft 30, spiral rod 31, first connecting shaft 32, second connecting shaft 33, limiting ring 331, lower pressure rod 40, hollow rod body 41, drive sleeve 42, inner sleeve body 421, sliding ring 422, straight through hole 423, chuck 50, one-way transmission component 60, bushing 70, annular body 701, connecting ear 702, ring platform 703, elastic element 80. Detailed Implementation

[0036] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Identical components are indicated by the same reference numerals.

[0037] Please see Figures 1 to 9 This utility model embodiment provides a downward pressure unidirectional rotation mechanism, which is suitable for independent rotating mop handles. It includes a fixed cover 10, a cylindrical shaft 20, a rotating shaft 30, a downward pressure rod 40, and a chuck 50.

[0038] The fixed cover 10 has a first cavity 101 inside, with the bottom end of the first cavity 101 being an open end. The center of the top wall of the fixed cover 10 has a through hole 102 communicating with the first cavity 101. The cylindrical shaft 20 surrounds the through hole 102 and is coaxially mounted on the top wall of the fixed cover 10. The inner cavity of the cylindrical shaft 20, the through hole 102, and the top of the first cavity 101 together form a second cavity. The rotating shaft 30 is mounted in the second cavity in a manner that allows it to rotate around the central axis of the fixed cover 10. The bottom end of the pressing rod 40 is placed inside the cylindrical shaft 20 and slides axially with the cylindrical shaft 20, and is helically driven with the rotating shaft 30. The chuck 50 is rotatably mounted inside the first cavity 101 and is unidirectionally driven with the bottom end of the rotating shaft 30 through a unidirectional transmission member 60.

[0039] The principle of the downward unidirectional rotation mechanism in this embodiment is as follows: Hold the cylinder shaft 20 or press the fixed cover 10 onto the mop bucket to fix the cylinder shaft 20 and the fixed cover 10 in place. When the downward pressing rod 40 moves down, it drives the rotating shaft 30 to rotate in the first direction. The unidirectional transmission component 60 engages and drives the chuck 50 to rotate synchronously. When the downward pressing rod 40 moves up, it drives the rotating shaft 30 to rotate in the second direction opposite to the first direction. The unidirectional transmission component 60 disengages, and the chuck 50 does not move or continues to rotate in the original direction due to inertia. By repeating this operation, the downward pressing rod 40 moves up and down, which will continuously drive the chuck 50 to rotate in the first direction.

[0040] In this embodiment, it should be noted that if the first direction is clockwise or counterclockwise, then the second direction is either counterclockwise or clockwise.

[0041] The downward pressure unidirectional rotation mechanism of this utility model converts linear downward pressure into rotational driving force through the linear reciprocating motion of the downward pressure rod 40 and the helical cooperation of the rotating shaft 30. It also uses the unidirectional transmission component 60 to convert the bidirectional rotational input into the continuous unidirectional rotational output of the chuck 50. This allows users to drive the chuck to rotate at high speed without putting the mop into a traditional mop bucket, simply by pressing down, to achieve centrifugal dehydration or dust and impurities removal, greatly expanding the application scenarios and ease of use of the product.

[0042] To further optimize the user experience and adapt to different operating postures, this embodiment also improves the structure of the cylinder shaft 20 and the rotating shaft 30.

[0043] like Figure 2-8 As shown, the cylindrical shaft 20 includes a fixed cylindrical body and a hinged cylindrical shaft 23. A fixed shaft seat 103 is fixedly provided around the through hole 102 on the top surface of the fixed cover 10. The top end of the hinged cylindrical shaft 23 is hinged to the bottom end of the fixed cylindrical body, so that the fixed cylindrical body can swing relative to the hinged cylindrical shaft 23 within a certain angle range. The bottom end of the hinged cylindrical shaft 23 is hinged to the fixed shaft seat 103, so that the cylindrical shaft 20 can swing relative to the fixed shaft seat 10 within a certain angle range.

[0044] To accommodate the cylindrical shaft 20, the rotating shaft 30 adopts a segmented hinged design. Specifically, as shown below... Figure 2-8As shown, the rotating shaft 30 includes a helical rod 31, a first connecting shaft 32, and a second connecting shaft 33, which are coaxially arranged from top to bottom. The top end of the first connecting shaft 32 is hinged to the bottom end of the helical rod 31, and the bottom end of the first connecting shaft 32 is hinged to the top end of the second connecting shaft 33. The hinged cylindrical shaft 23 is collinear with the hinged shaft of the fixed cylinder, and the helical rod 31 is collinear with the hinged shaft of the first connecting shaft 32. The hinged cylindrical shaft 23 is also collinear with the hinged shaft of the fixed shaft seat 103, and the hinged shafts of the first and second connecting shafts 32 and 33. When the cylindrical shaft 20 swings relative to the fixed cover 10, the various parts of the rotating shaft 30 can bend synchronously and in a coordinated manner through the collinear hinged shafts, effectively avoiding problems such as mechanism jamming, wear, or damage caused by asynchronous movement, and ensuring the smoothness and reliability of the movement of the hinged cylindrical shaft 23.

[0045] More specifically, when dehydration or impurity removal is required, the downward pressure rod 40 is swung to make the fixed cylinder, the hinged cylinder shaft 23, and the fixed shaft seat 103 coaxial. At this time, the screw rod 31, the first connecting shaft 32, and the second connecting shaft 33 also swing synchronously with the cylinder shaft 20 to become coaxial. When mopping is required, depending on the operation mode, the cylinder shaft 20 and the fixed shaft seat 103 form a certain angle. The corresponding screw rod 31, the first connecting shaft 32, and the second connecting shaft 33 also swing synchronously with the cylinder shaft 20 to the corresponding angle. At this time, the rotating shaft 30 is locked and stationary, and the corresponding cylinder shaft 20 is also locked and stationary.

[0046] In this embodiment, the axis of the hinge shaft 23 and the hinge shaft of the fixed cylinder body, and the axis of the hinge shaft 23 and the hinge shaft of the fixed shaft seat 103 are spatially perpendicular to each other. This allows the cylinder shaft 20 and the pressure rod 40 to achieve multi-directional and large-angle folding. Specifically, the pressure rod 40 can be bent in four basic directions (such as front, back, left, and right), with an included angle of approximately 90 degrees between each direction. This structure not only reduces the overall height of the mop handle, facilitating cleaning and compact storage in low spaces (such as under furniture), but also allows users to adjust their operating posture more freely, reducing user fatigue.

[0047] like Figure 4 and Figure 5 As shown, the bottom end of the fixed cylinder, both ends of the hinged cylinder shaft 23, and the fixed shaft seat 103 are all U-shaped fork structures. This structure not only provides stable support for each hinge point, but also makes the swinging motion smooth and synchronous, effectively avoiding motion interference, and ultimately realizing the rapid and compact swinging of the whole device, improving the convenience of operation and the portability of the product.

[0048] like Figure 2 , Figure 7 as well as Figure 8The pressing rod 40 includes a hollow rod body 41 and a drive sleeve 42. The drive sleeve 42 includes an inner sleeve body 421 and a sliding ring 422 fixed to the outer wall of the bottom end of the inner sleeve body 421. The outer wall of the sliding ring 422 is axially slidingly engaged with the inner wall of the fixed cylinder. The inner sleeve body 421 is fixedly fitted to the inner wall of the bottom end of the hollow rod body 41. The center axis of the inner sleeve body 421 is provided with a through hole 423 that engages with the screw groove of the screw rod 31. When the pressing rod 40 moves linearly relative to the cylinder shaft 20, the linear motion is converted into the rotational motion of the screw rod 31 through the engagement of the through hole 423 with the screw rod 31. The transmission efficiency is high and the response is fast.

[0049] like Figure 2 As shown, the fixed cylinder includes an upper cylinder 21 and a lower cylinder 22. The lower cylinder 22 includes an outer cylinder section 221 and an inner cylinder section 222 coaxially arranged. The inner cylinder section 222 is fitted inside the lower section of the upper cylinder 21, and its outer wall has two protrusions 223 spaced apart circumferentially. The lower section of the upper cylinder 21 has connecting holes 211 that are adapted to the two protrusions 223. The inner cylinder section 222 and the upper cylinder 21 are fixedly connected by the snap-fit ​​engagement of the protrusions 223 and the connecting holes 211. Specifically, both the upper cylinder 21 and the lower cylinder 22 are made of ABS or PP plastic, which has a certain degree of elasticity, allowing the upper cylinder 21 and the lower cylinder 22 to be connected by snap-fit. In this structure, the bottom end of the outer cylinder section 221 is hinged to the top end of the hinged cylinder shaft 23, therefore, the bottom end of the outer cylinder section 221 has a U-shaped fork structure.

[0050] like Figure 7 and Figure 8 As shown, in this embodiment, the inner wall of the upper cylinder 21 includes a small diameter section 212 and a large diameter section 213 from top to bottom. The inner cylinder section 222 is fixedly fitted inside the bottom inner wall of the large diameter section 213. The outer wall of the sliding ring 422 is slidably engaged with the inner wall of the large diameter section 213. The stepped surfaces of the small diameter section 212 and the large diameter section 213 are the upper limit of the stroke of the sliding ring 422, and the top surface of the inner cylinder section 222 is the lower limit of the stroke of the sliding ring 422. Setting the inner wall of the upper cylinder 21 to have a small diameter section 212 and a large diameter section 213 not only facilitates the installation and insertion of the drive sleeve 42, but more importantly, it limits the stroke range of the pressure rod 40, preventing excessive pressure or rebound that could damage the mechanism, and ensuring the safety and lifespan of the device.

[0051] In this embodiment, an elastic element 80 is also included. The elastic element 80 is sleeved outside the screw rod 31. One end of the elastic element 80 presses against the lower top surface of the drive sleeve 42, and the other end of the elastic element 80 presses against the connecting surface of the outer cylinder section 221 and the inner cylinder section 222. The elastic element 80 is configured to be compressed when the lowering rod 40 moves down, and to provide an upward restoring force for the lowering rod 40.

[0052] Specifically, the elastic element 80 is preferably a compression spring. After the downward pressure is released, the reset function of the elastic element 80 automatically pushes the downward pressure rod 40 to move upward quickly, reducing the manual lifting force and improving the convenience and efficiency of operation. At the same time, it can also buffer the downward pressure process, improve the operating feel, and reduce the impact damage to internal parts. In addition, the constant elastic force helps to maintain reliable engagement between the drive sleeve 42 and the helical rod 31, preventing accidental disengagement and ensuring the continuity of power transmission.

[0053] like Figures 7-9 As shown, the first cavity 101 is provided with a bushing 70 that is fixedly connected to the inner top surface of the fixed cover 10 and to the second connecting shaft 33, and the bushing 70 and the inner top surface of the fixed cover 10 form a shaft assembly space. The second connecting shaft 33 can be horizontally rotated around the central axis and is located in the shaft assembly space.

[0054] Specifically, the bushing 70 includes an annular body 701, two symmetrical connecting ears 702 integrally disposed on the outer annular wall of the annular body 701, and an annular platform 703 integrally disposed on the inner annular wall of the annular body 701. The bushing 70 is fixed in the first cavity 101 by screws that pass through the two connecting ears 702 and are embedded in the studs of the fixing cover 10. The bottom outer wall of the second connecting shaft 33 is provided with a limiting ring 331. The top surface of the limiting ring 331 abuts against the inner top surface of the fixing cover 10, and the bottom surface of the limiting ring 331 abuts against the annular platform 703, so that the second connecting shaft 33 can only be rotatably disposed in the bushing 70, thereby realizing the limiting of the second connecting shaft 33, and thus realizing that the rotating shaft 30 is disposed in the second cavity in a manner that can be rotated horizontally but cannot be moved axially.

[0055] In this embodiment, the one-way transmission component 60 preferably uses an HF one-way needle roller bearing. The chuck 50 is fixedly connected to the outer ring of the one-way bearing, and the second connecting shaft 33 is fixedly connected to the inner ring of the one-way transmission component 60. When the second connecting shaft 33 rotates in the first direction, it drives the outer ring of the one-way bearing and the chuck 50 to rotate synchronously. When the second connecting shaft 33 rotates in the second direction, due to the inherent characteristics of the one-way bearing, the outer ring of the one-way bearing maintains its original state, that is, it rotates in the first direction, so that the chuck 50 can only rotate in the first direction. The HF one-way needle roller bearing is a directly purchased component, and its specific structure will not be described in detail.

[0056] like Figure 6 As shown, in this embodiment, at least two radially extending support legs 104 are provided circumferentially at intervals along the outer edge of the fixed cover 10. Preferably, there are four support legs 103, which are evenly distributed circumferentially along the outer edge of the fixed cover 10. The support legs 103 facilitate the fixing of the fixed cover 10, such as pressing it against the edge of the mop bucket.

[0057] This makes it easier to drive the rotating shaft.

[0058] The technical solution of this utility model has been described in detail above with reference to specific embodiments. The specific embodiments described are used to help understand the concept of this utility model. Derivations and modifications made by those skilled in the art based on the specific embodiments of this utility model also fall within the protection scope of this utility model.

Claims

1. A downward-pressing unidirectional rotation mechanism, characterized in that: include: A fixed cover (10) is provided inside the fixed cover (10), the bottom end of the first cavity (101) is an open end, and the center of the top wall of the fixed cover (10) is provided with a through hole (102) communicating with the first cavity (101). A cylindrical shaft (20) surrounds a through hole (102) and is coaxially disposed on the top wall of a fixed cover (10). The inner cavity of the cylindrical shaft (20), the through hole (102), and the top of the first cavity (101) together form a second cavity. A rotating shaft (30) is disposed in the second cavity in such a way that it can rotate about the central axis of the fixed cover (10); The bottom end of the pressure rod (40) is placed inside the cylindrical shaft (20) and is axially slidingly engaged with the cylindrical shaft (20) and helically driven engaged with the rotating shaft (30); And a chuck (50), which is rotatably disposed in the first cavity (101) and is unidirectionally driven to cooperate with the bottom end of the rotating shaft (30) through a one-way transmission member (60).

2. The downward pressing unidirectional rotation mechanism according to claim 1, characterized in that, The cylindrical shaft (20) includes a fixed cylindrical body and a hinged cylindrical shaft (23). The top surface of the fixed cover (10) is fixedly provided with a fixed shaft seat (103) around the through hole (102). The top end of the hinged cylindrical shaft (23) is hinged to the bottom end of the fixed cylindrical body, and the bottom end of the hinged cylindrical shaft (23) is hinged to the fixed shaft seat (103). The rotating shaft (30) includes a helical rod (31), a first connecting shaft (32), and a second connecting shaft (33) arranged coaxially from top to bottom. The top end of the first connecting shaft (32) is hinged to the bottom end of the helical rod (31), and the bottom end of the first connecting shaft (32) is hinged to the top end of the second connecting shaft (33). Among them, the hinge cylinder shaft (23) is collinear with the hinge shaft of the fixed cylinder and the hinge shaft of the spiral rod (31) is collinear with the hinge shaft of the first connecting shaft (32). The hinge cylinder shaft (23) is collinear with the hinge shaft of the fixed shaft seat (103) and the hinge shaft of the first connecting shaft (32) is collinear with the hinge shaft of the second connecting shaft (33).

3. The downward pressing unidirectional rotation mechanism according to claim 2, characterized in that, The axis of the hinge cylinder shaft (23) and the hinge shaft of the fixed cylinder body, and the axis of the hinge cylinder shaft (23) and the hinge shaft of the fixed shaft seat (103) are perpendicular to each other in space.

4. The downward pressing unidirectional rotation mechanism according to claim 2, characterized in that, The bottom end of the fixed cylinder, both ends of the hinged cylinder shaft (23), and the fixed shaft seat (103) are all U-shaped fork structures.

5. A downward pressing unidirectional rotation mechanism according to claim 2, characterized in that, The pressing rod (40) includes a hollow rod body (41) and a drive sleeve (42). The drive sleeve (42) includes an inner sleeve body (421) and a sliding ring (422) fixed to the outer wall of the bottom end of the inner sleeve body (421). The outer wall of the sliding ring (422) is axially slidingly engaged with the inner wall of the fixed cylinder. The inner sleeve body (421) is fixedly fitted to the inner wall of the bottom end of the hollow rod body (41). The inner sleeve body (421) has a through hole (423) in the center axial direction that engages with the screw groove of the screw rod (31) for driving cooperation.

6. The downward pressing unidirectional rotation mechanism according to claim 5, characterized in that, The fixed cylinder includes an upper cylinder (21) and a lower cylinder (22). The lower cylinder (22) includes an outer cylinder section (221) and an inner cylinder section (222) arranged coaxially. The inner cylinder section (222) is sleeved inside the lower section of the upper cylinder (21), and its outer wall is provided with two protrusions (223) spaced apart in the circumferential direction. The lower section of the upper cylinder (21) is provided with a connecting hole (211) that matches the two protrusions (223). The inner cylinder section (222) and the upper cylinder (21) are fixedly connected by the engagement of the protrusions (223) and the connecting hole (211).

7. A downward pressing unidirectional rotation mechanism according to claim 6, characterized in that, The inner wall of the upper cylinder (21) includes a small diameter section (212) and a large diameter section (213) from top to bottom. The inner cylinder section (222) is fixedly fitted inside the bottom inner wall of the large diameter section (213). The outer wall of the sliding ring (422) is slidably engaged with the inner wall of the large diameter section (213). The stepped surfaces of the small diameter section (212) and the large diameter section (213) are the upper limit of the stroke of the sliding ring (422), and the top surface of the inner cylinder section (222) is the lower limit of the stroke of the sliding ring (422).

8. A downward pressing unidirectional rotation mechanism according to claim 7, characterized in that, It also includes an elastic element (80) sleeved on the outside of the helical rod (31), one end of which presses against the lower top surface of the drive sleeve (42), and the other end of which presses against the connecting surface of the outer cylinder section (221) and the inner cylinder section (222). The elastic element (80) is configured to be compressed when the lower pressure rod (40) moves downward and to provide an upward restoring force for the lower pressure rod (40).

9. A downward pressing unidirectional rotating mechanism according to claim 8, characterized in that, The first cavity (101) is provided with a bushing (70) around the through hole (102), which is fixedly connected to the inner top surface of the fixed cover (10) and coaxial with the second connecting shaft (33). The bushing (70) and the inner top surface of the fixed cover (10) form a shaft assembly space. The bottom end of the second connecting shaft (33) is located in the shaft assembly space through a one-way transmission member (60).

10. A downward pressing unidirectional rotation mechanism according to claim 1, characterized in that, The outer edge of the fixed cover (10) is provided with at least two radially outwardly extending feet (104) at circumferential intervals.

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