Mechanical multi-stage speed damper

Abstract

A mechanical multi-speed damper includes a support module, a support rotating shaft sleeve, and a damping sleeve. The support module includes a fixed seat having a substrate, a support shaft vertically extending from the substrate, a friction ring having elasticity and sleeved on the support shaft, and a screw rod axially passing through the support shaft and extending out of the end of the support shaft. The support rotating shaft sleeve is rotatably sleeved on the support shaft for supporting a shaft rod. The damping sleeve is coaxially arranged with the support shaft and the support rotating shaft sleeve and is used for interlocking with the shaft rod. When the damping sleeve is interlocked by the shaft rod, it can rotate along the screw rod and move relative to the friction ring. The barrel of the damping sleeve has multiple sections of inner diameter changes, so that during the movement of the damping sleeve relative to the friction ring, the inner peripheral surface of the barrel contacts the friction ring to generate multi-speed damping changes. It is not only easy to manufacture and assemble, but also small in size and light in weight, and is suitable for application in a rolling curtain device to slow down the rotation speed of the shaft rod when the curtain is freely lowered, so that the curtain can fall slowly at a substantially constant speed.

Description

Technical Field

[0001] The present invention relates to a mechanical damper, and particularly to a mechanical multi-speed damper. Background Art

[0002] Generally, for a rolling shutter that can be freely lowered, it usually requires the user to use a pull rope to control the lowering speed of the rolling shutter. If the user does not apply force to the pull rope to slow down the descending speed of the rolling shutter, the rolling shutter will descend rapidly, generating large vibrations and noises. If a damper is installed on the shaft of the rolling shutter to slow down the rotation speed of the shaft, since most mechanical dampers are of a single force, when there is resistance at the initial stage of the rolling shutter being lowered, the rolling shutter will not be able to drop. In other words, for a damper to be applied to the shaft of a rolling shutter, the damping force must be changed according to the lowering stroke of the rolling shutter in order to make the lowering stroke of the rolling shutter slowly descend at a substantially constant speed. However, current mechanical dampers cannot meet such a requirement.

[0003] Although there is currently a damping system of an electric control method that uses position monitoring or time control plus digital output to change the damping force to meet the need for a coherent mechanism to require multiple different damping forces. However, such an electric control damping system is not only expensive but also bulky, and there are various restrictions on installation. Therefore, it is not suitable for products such as rolling shutters that are small in size and require easy installation. Summary of the Invention

[0004] One object of the present invention is to provide a mechanical multi-speed damper that can generate different damping forces during the rotation stroke.

[0005] In some embodiments of the mechanical multi-speed damper of the present invention, it is suitable for connecting to a shaft. The mechanical multi-speed damper includes a support module, a support rotating shaft sleeve, and a damping sleeve. The support module includes a fixed seat, a support shaft, a friction ring, and a screw. The fixed seat has a base plate, and the base plate has an inner surface and an outer surface located on opposite sides. The support shaft is connected to the base plate and extends perpendicular to the inner surface of the base plate. The friction ring has elasticity, and the ring sleeve is fixed to the support shaft near the end. The screw is axially disposed through the support shaft along the axis of the support shaft and extends out of the end of the support shaft. The support rotating shaft sleeve is rotatably sleeved on the support shaft to support the shaft and is driven by the shaft to rotate. The damping sleeve is coaxially arranged with the support shaft and the support rotating shaft sleeve and is used to be driven by the shaft. The damping sleeve has a barrel body and open ends and closed ends located at opposite ends of the barrel body. The open end faces the friction ring, and the closed end has a sleeve screw hole that cooperates with the screw so that when the damping sleeve is driven by the shaft, it can rotate along the screw and move relative to the friction ring. The barrel body has multiple sections of inner diameter changes, so that during the stroke of the damping sleeve moving relative to the friction ring, the inner peripheral surface of the barrel body contacts the friction ring to generate a multi-speed damping change.

[0006] In some embodiments, the support rotating shaft sleeve has a socket portion for socketing on the inner circumference of the shaft rod. The socket portion has a first groove recessed from the outer circumference to accommodate a clamping strip protruding from the inner circumferential surface of the shaft rod. The outer diameter of the barrel body of the damping sleeve is smaller than the outer diameter of the socket portion. The damping sleeve further has a flange protruding from the outer circumferential surface of the barrel body, and the flange has a second groove corresponding to the first groove to accommodate the clamping strip of the shaft rod, and the damping sleeve is linked with the shaft rod by the action of the flange and the clamping strip.

[0007] In some embodiments, the support shaft has a main body segment connected to the substrate and a limiting segment extending from the main body segment and having a gradually decreasing outer diameter for sleeving the friction ring. The limiting segment is located at the end of the support shaft and has an anti-rotation hole located at the axis and being non-circular. The support module further includes a clamping member. The clamping member has a shaft portion and a clamping portion surrounding and protruding from the shaft portion. The shaft portion has a connecting segment located on one side of the clamping portion and having a shape matching the anti-rotation hole and being accommodated in the anti-rotation hole, and a clamping member screw hole located at the axis and screwed with the screw. The clamping portion and the limiting segment jointly clamp the friction ring and can adjust the clamping tightness.

[0008] In some embodiments, the support module further includes a fixing member screwed to the screw. The fixing member abuts against the shaft portion of the clamping member at the opposite end of the connecting segment.

[0009] In some embodiments, the adjustment module includes a rotation control member rotatably disposed on the outer surface of the substrate. The rotation control member has a shaft connection portion coaxially arranged with the support shaft and a control portion connecting the shaft connection portion for a user to apply force to drive the shaft connection portion to rotate. The shaft connection portion has a control member screw hole located at the axis and screwed with the screw. By rotating the rotation control member to move the screw, the clamping member is linked to adjust the clamping tightness of the friction ring.

[0010] In some embodiments, the adjustment module further includes a positioning member disposed on the substrate and movably contacting the rotation control member to limit the rotation of the rotation control member.

[0011] In some embodiments, the control portion has a disk-shaped body and a surrounding wall connected to the outer circumference of the body. The surrounding wall has a plurality of card slots arranged in a circumferential direction. The positioning member has an elastic clamping portion elastically displaceably clamped in one of the card slots.

[0012] In some embodiments, the elastic clamping portion has two elastic arms connected in a V shape and a clamping block located at the junction of the elastic arms. The shape of the clamping block matches the card slot to be clamped in one of the card slots.

[0013] In some embodiments, the fixing base further has a limiting ring body extending from the outer surface of the substrate. The limiting ring body has a small-diameter portion connecting to the substrate and a large-diameter portion with an outer diameter larger than that of the small-diameter portion and spaced from the substrate. The control portion further has a plurality of snap pieces arranged at intervals in the circumferential direction and snapped onto the large-diameter portion. The snap pieces can slide relative to the large-diameter portion in the circumferential direction so that the rotation control member is rotatably connected to the fixing base, and the surrounding wall abuts against the substrate to axially position the rotation control member relative to the fixing base.

[0014] In some embodiments, the shaft connecting portion passes through the substrate and extends into the support shaft.

[0015] In some embodiments, the barrel body further has a plurality of oil grooves located on its inner circumferential surface and extending axially for the flow of lubricating oil.

[0016] The present invention has at least the following effects: The mechanical multi-stage speed damper can generate multi-stage speed damping changes through a simple mechanical structure, which is not only easy to manufacture and assemble, but also small in size and light in weight, and is suitable for application in a rolling curtain device to slow down the rotation speed of the shaft rod when the curtain freely descends, so that the curtain can descend slowly at a substantially constant speed. Description of the Drawings

[0017] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein:

[0018] Figure 1 is a perspective view of an embodiment of the mechanical multi-stage speed damper of the present invention applied to a rolling curtain device;

[0019] Figure 2 is a perspective exploded view of the rolling curtain device;

[0020] Figure 3 is an incomplete perspective view of the embodiment and the shaft rod;

[0021] Figure 4 is an incomplete perspective exploded view of the embodiment and the shaft rod;

[0022] Figure 5 is a perspective view of the embodiment;

[0023] Figure 6 is a perspective exploded view of the embodiment;

[0024] Figure 7 is corresponding to Figure 6 a perspective exploded view from another perspective;

[0025] Figure 8 is a perspective exploded view of the embodiment;

[0026] Figure 9 is alongFigure 4 A cross-sectional view taken along the straight line IX-IX;

[0027] Figure 10 is a cross-sectional view taken along Figure 3 the straight line X-X in;

[0028] Figure 11 is an exploded perspective view of some components of this embodiment; and

[0029] Figure 12 is a side view of this embodiment. Detailed implementation manner

[0030] Refer to Figure 1 and Figure 2 , an embodiment of the mechanical multi-stage speed damper 10 of the present invention is described by taking its application to a roller blind device 100 as an example. The roller blind device 100 further includes a lifting controller 20, a shaft rod 30 connecting the mechanical multi-stage speed damper 10 and the lifting controller 20, a curtain 40 wound around the shaft rod 30, and a mask 50 connecting the mechanical multi-stage speed damper 10 and the lifting controller 20 and covering the curtain 40. The lifting controller 20 is used for a user to operate to drive the shaft rod 30 to control the lifting of the curtain 40 and can be operated to allow the curtain 40 to be freely lowered. The mechanical multi-stage speed damper 10 is used to provide a damping force to the shaft rod 30 when the curtain 40 is freely lowered, so that the curtain 40 can slowly fall at a substantially constant speed. The following further describes the embodiment of the mechanical multi-stage speed damper 10.

[0031] Refer to Figures 3 to 5 , the mechanical multi-stage speed damper 10 includes a support module 1, a support rotating shaft sleeve 2, a damping sleeve 3, and an adjustment module 4.

[0032] Refer to Figures 6 to 9 , the support module 1 includes a fixed seat 11, a support shaft 12, a friction ring 13, a screw 14, a clamping member 15, and a fixing member 16. The fixed seat 11 is used to be connected with the mask 50 (see Figure 2) is connected and has a substrate 111. The substrate 111 has an inner surface 112 and an outer surface 113 on opposite sides. The support shaft 12 is connected to the substrate 111 and extends perpendicular to the inner surface 112 of the substrate 111. In this embodiment, the support shaft 12 has a main body section 121 connected to the substrate 111 and a limiting section 122 extending from the main body section 121 with a gradually decreasing outer diameter for the friction ring 13 to be sleeved thereon. The limiting section 122 is located at the end of the support shaft 12 and has an anti-rotation hole 123 located at the axis and being non-circular. The friction ring 13 is elastic and is fixedly sleeved on the support shaft 12 near the end, which is located at the limiting section 122 in this embodiment. The screw 14 is inserted through the axis of the support shaft 12 and extends out of the end of the support shaft 12. The clamping member 15 has a shaft portion 151 and a clamping portion 152 surrounding and protruding from the shaft portion 151. The shaft portion 151 has a connecting section 151a located on one side of the clamping portion 152 with a shape matching the anti-rotation hole 123 and being received in the anti-rotation hole 123, and a clamping screw hole 151b located at the axis and being screwed with the screw 14. The clamping portion 152 and the limiting section 122 jointly clamp the friction ring 13 and can adjust the clamping tightness. In this embodiment, the position of the clamping member 15 can be controlled by the adjustment module 4 to adjust the clamping tightness, which will be further described below. The fixing member 16 is screwed to the screw 14 and abuts against the shaft portion 151 of the clamping member 15 at the opposite end of the connecting section 151a to relatively position the screw 14 and the clamping member 15. In this embodiment, the fixing member 16 is a nut.

[0033] Refer to Figure 3 , Figure 4 and Figure 10 , the support rotating shaft sleeve 2 is rotatably sleeved on the support shaft 12 for supporting the shaft rod 30 and being driven to rotate by the shaft rod 30. The support rotating shaft sleeve 2 has a socket portion 21 for socketing on the inner circumference of the shaft rod 30 and a abutting plate 22 connecting the socket portion 21 and abutting against the substrate 111. The socket portion 21 has a first groove 211 recessed from the outer circumference to receive a clamping strip 301 protruding from the inner circumferential surface of the shaft rod 30.

[0034] Refer to Figures 8 to 10, the damping sleeve 3 is coaxially arranged with the support shaft 12 and the support rotating shaft sleeve 2 and is used for interlocking with the shaft rod 30. The damping sleeve 3 has a barrel body 31 and an open end 32 and a closed end 33 located at opposite ends of the barrel body 31. The open end 32 faces the friction ring 13. The closed end 33 has a sleeve screw hole 331 that cooperates with and is screwed to the screw rod 14, so that when the damping sleeve 3 is interlocked by the shaft rod 30, it can rotate along the screw rod 14 and move relative to the friction ring 13. The barrel body 31 has multiple sections with varying inner diameters, so that during the stroke of the damping sleeve 3 moving relative to the friction ring 13, the inner peripheral surface of the barrel body 31 contacts the friction ring 13 to generate multiple sections of variable damping. In this embodiment, the outer diameter of the barrel body 31 of the damping sleeve 3 is smaller than the outer diameter of the socket portion 21, so that the barrel body 31 does not contact the shaft rod 30. The damping sleeve 3 also has a flange 34 protruding from the outer peripheral surface of the barrel body 31, and the flange 34 has a second groove 341 corresponding to the first groove 211 to accommodate the latch 301 of the shaft rod 30, and the damping sleeve 3 is interlocked with the shaft rod 30 by the interaction between the flange 34 and the latch 301. As Figure 9 shown, the barrel body 31 has a first inner diameter 311, a second inner diameter 312, a third inner diameter 313, a fourth inner diameter 314, a fifth inner diameter 315, a sixth inner diameter 316, and a seventh inner diameter 317 that are continuously arranged along the axis from adjacent to the open end 32 towards the closed end 33. The inner diameter dimensions of each section are inconsistent and the lengths along the axis are also inconsistent. The larger the inner diameter dimension of each section, the smaller the frictional force generated with the friction ring 13, and vice versa, the smaller the inner diameter dimension of each section, the larger the frictional force generated with the friction ring 13. In this embodiment, when the curtain 40 (see Figure 2 ) is freely lowered under the action of gravity, due to the moment and the weight factor of the curtain 40 being lowered, in the initial stage when the lowered length is within about 1 / 8 of the total length of the curtain 40, the resistance must be 0 to facilitate the self-descending of the curtain 40. When the lowered length is about 2 / 8 of the total length of the curtain 40, the maximum resistance is required to block the accelerating inertia of the curtain 40 falling. After that, the resistance required for the curtain 40 to be lowered needs to be reduced to a medium resistance and then slowly increased until the curtain 40 is completely lowered.

[0035] Therefore, in this embodiment, when the curtain 40 is fully retracted on the shaft 30, the damping sleeve 3 does not contact the friction ring 13. When the user operates the lifting controller 20 to allow the curtain 40 to be freely lowered, the damping sleeve 3 does not contact the friction ring 13 and no resistance is generated. The shaft 30 can be driven by the curtain 40 to rotate backward and drive the damping sleeve 3 to rotate. The sleeve screw hole 331 of the damping sleeve 3 acts on the screw 14 to move the damping sleeve 3 toward the support rotating shaft sleeve 2. As the curtain 40 descends, the inner peripheral surface of the barrel body 31 contacts the friction ring 13 in sequence from the first-section inner diameter 311 to the seventh-section inner diameter 317 to generate resistance, and the shaft 30 and the damping sleeve 3 are driven together to be subjected to the resistance and the rotation speed is slowed down. The sizes and lengths of the first-section inner diameter 311 to the seventh-section inner diameter 317 are designed according to the resistance required for the descending stroke of the curtain 40, so as to generate multi-stage speed damping changes, and the curtain 40 can slowly descend at a substantially constant speed during the descending process. When the user operates the lifting controller 20 to raise the curtain 40, the shaft 30 rotates in the reverse direction and drives the damping sleeve 3 to rotate in the reverse direction, so that the damping sleeve 3 gradually moves away from the friction ring 13. When the curtain 40 returns to the state of being fully retracted on the shaft 30, the damping sleeve 3 also returns to its original position.

[0036] In addition, in this embodiment, as Figure 9 shown, the barrel body 31 further has a plurality of oil grooves 318 located on the inner peripheral surface and extending axially for the flow of lubricating oil, thereby enabling the friction ring 13 to be properly lubricated.

[0037] Refer to Figure 7 、 Figure 9 、 Figure 11 and Figure 12, the fixing base 11 further has a limiting ring body 114 extending from the outer surface 113 of the substrate 111. The limiting ring body 114 has a small-diameter portion 114a connecting the substrate 111 and a large-diameter portion 114b with an outer diameter larger than that of the small-diameter portion 114a and spaced from the substrate 111. The adjustment module 4 includes a rotation control member 41 rotatably disposed on the outer surface 113 of the substrate 111, and a positioning member 42 disposed on the substrate 111 and movably contacting the rotation control member 41 to limit the rotation of the rotation control member 41. The rotation control member 41 has a shaft connection portion 411 coaxially arranged with the support shaft 12 and a control portion 412 connecting the shaft connection portion 411 for a user to apply force to drive the shaft connection portion 411 to rotate. The shaft connection portion 411 passes through the substrate 111 and extends into the support shaft 12, and has a control member screw hole 413 located at the axis and screwed with the screw 14. The control portion 412 has a body 412a in the shape of a circular plate, a surrounding wall 412b connected to the outer periphery of the body 412a, and a plurality of buckle pieces 412d arranged at intervals in the circumferential direction and buckled on the large-diameter portion 114b. The buckle pieces 412d can slide relative to the large-diameter portion 114b in the circumferential direction so that the rotation control member 41 is rotatably connected to the fixing base 11, and the surrounding wall 412b abuts against the substrate 111 so that the rotation control member 41 and the fixing base 11 are axially relatively positioned. The surrounding wall 412b has a plurality of card slots 412c arranged in the circumferential direction, and the positioning member 42 has an elastic locking portion 421 elastically displaceably clamped in one of the card slots 412c.

[0038] In this embodiment, the positioning member 42 is located above the rotation control member 41, and further has a support structure 422 generally in the shape of a cross, two fixing columns 423 respectively extending vertically from the support structure 422 near the longitudinal two ends to the substrate 111, and two hooks 424 respectively extending vertically from the support structure 422 near the transverse two ends to the substrate 111. The positioning member 42 is fixedly combined with the substrate 111 by passing through and clamping the corresponding through holes 115 of the substrate 111 through the fixing columns 423 and the hooks 424 respectively. The elastic locking portion 421 has two elastic arms 421a respectively extending obliquely towards each other from the transverse two ends of the support structure 422 and connected in a V shape, and a block 421b located at the junction of the elastic arms 421a. The shape of the block 421b is matched with the card slot 412c to be clamped in one of the card slots 412c.

[0039] By rotating the rotation control member 41 to move the screw 14, the clamping member 15 is linked to adjust the tightness of clamping the friction ring 13. As Figure 12In the shown direction, when the rotation control member 41 is rotated clockwise, the screw 14 will move towards the rotation control member 41, and the clamping member 15 will be driven to approach the limiting section 122, thereby clamping the friction ring 13, causing the friction ring 13 to be elastically deformed by axial extrusion. That is, it is compressed axially and expands radially, resulting in an increase in the outer diameter. Thus, when contacting the damping sleeve 3, a greater frictional force will be generated. Conversely, if the rotation control member 41 is rotated counterclockwise, the screw 14 will move away from the rotation control member 41, and the clamping member 15 will be driven to move away from the limiting section 122, reducing the clamping force on the friction ring 13, and thus decreasing the outer diameter of the friction ring 13. As a result, a smaller frictional force is generated when contacting the damping sleeve 3. Since the damping force between the damping sleeve 3 and the friction ring 13 is generated by friction, the friction coefficient between the two may change due to environmental temperature variations. Therefore, the adjustment module 4 can conveniently fine-tune the frictional force between the friction ring 13 and the damping sleeve 3 from the outside. In addition, although the outer diameter of the friction ring 13 changes due to adjustment, the relative dimensional ratios of the multiple internal diameters of the barrel 31 of the damping sleeve 3 still exist. Therefore, the relative dimensional ratios of the multiple internal diameters of the damping sleeve 3 still correspond to the weight of the curtain 40 and the relative position changes during descent. Thus, by fine-tuning the frictional force between the friction ring 13 and the damping sleeve 3, it can adapt to curtains 40 of different sizes and weights. In other words, the mechanical multi-stage speed damper 10 can adapt to curtains 40 of different sizes and weights with the same dimensional structure, thereby increasing the variety of applicable curtains 40.

[0040] By restricting the rotation of the rotation control member 41 through the positioning member 42, it can prevent the rotation control member 41 from rotating due to vibration or unexpected external forces. The elastic locking portion 421 is elastic. When the user rotates the rotation control member 41, the elastic locking portion 421 can elastically deform to make way, allowing the groove wall between adjacent card slots 412c to pass through the locking block 421b. When the next card slot 412c aligns with the locking block 421b, the locking block 421b will elastically reset and be clamped in the corresponding card slot 412c. In addition, the elastic locking portion 421 also has an indicating function. By the position of the locking block 421b in one of the card slots 412c, the relative position between the rotation control member 41 and the locking block 421b can be known. That is, the angle of clockwise or counterclockwise rotation of the rotation control member 41 can be known.

[0041] During assembly, the adjustment module 4 can be first fixed to the fixed seat 11; then the support rotating shaft sleeve 2 can be installed on the support shaft 12; then the friction ring 13 can be sleeved on the limiting section 122 of the support shaft 12; then the connecting section 151a of the clamping member 15 can be installed in the anti-rotation hole 123 to connect the clamping member 15 with the support shaft 12; then the screw 14 can be screwed into the adjustment module 4 and sequentially pass through the control member screw hole 413 and the clamping member screw hole 151b and extend out of the clamping member 15; then the fixing member 16 can be screwed into the end of the screw 14 until it abuts against the clamping member 15 and is locked; finally, the damping sleeve 3 can be installed on the screw 14.

[0042] In this embodiment, the clamping member screw hole 151b, the sleeve screw hole 331 and the control member screw hole 413 are respectively formed by hot melting and fixing metal nuts to the plastic clamping member 15, damping sleeve 3 and rotation control member 41, so as to have better structural strength. It can be understood that the adjustment module 4 enables the user to directly manually operate conveniently, but if the adjustment module 4 is not provided, the screw 14 can also be rotated by a tool to adjust the clamping member 15. Even in a variant embodiment, if the clamping member 15 is not provided and only the screw 14 and the friction ring 13 are directly fixed to the support shaft 12, the effect of generating multi-stage speed damping between the damping sleeve 3 and the friction ring 13 can still be achieved.

[0043] To sum up, the mechanical multi-stage speed damper 10 can generate multi-stage speed damping changes through a simple mechanical structure, which is not only easy to manufacture and assemble, but also small in size and light in weight, and is suitable for application in the rolling curtain device 100, so as to slow down the rotation speed of the shaft rod 30 when the curtain 40 is freely lowered, and enable the curtain 40 to slowly lower at a substantially constant speed.

[0044] The above are only embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made according to the claims and the content of the specification of the present invention still fall within the scope of the present invention.

Claims

1. A mechanical multi-stage speed damper, suitable for connecting a shaft rod, characterized in that: The mechanical multi-stage speed damper includes: A support module, including A fixed seat having a substrate with inner and outer surfaces on opposite sides, A support shaft connected to the substrate and extending perpendicular to the inner surface of the substrate, A friction ring having elasticity and sleeved and fixed on the support shaft near the end, and A screw rod axially passing through the support shaft and extending out of the end of the support shaft along the axis of the support shaft; A support rotating shaft sleeve rotatably sleeved on the support shaft for supporting the shaft rod and rotating under the linkage of the shaft rod; And A damping sleeve coaxially arranged with the support shaft and the support rotating shaft sleeve and used for linkage with the shaft rod. The damping sleeve has a barrel body, and open ends and closed ends at opposite ends of the barrel body. The open end faces the friction ring, and the closed end has a sleeve screw hole matching and screwing with the screw rod, so that when the damping sleeve is linked by the shaft rod, it can rotate along the screw rod and move relative to the friction ring. The barrel body has multi-stage inner diameter changes, so that during the movement stroke of the damping sleeve relative to the friction ring, the inner peripheral surface of the barrel body contacts the friction ring to generate multi-stage speed damping changes.

2. The mechanical multi-stage speed damper according to claim 1, characterized in that: The support rotating shaft sleeve has a socket part for sleeving on the inner circumference of the shaft rod. The socket part has a first groove recessed from the outer circumference to accommodate a clamping strip protruding from the inner circumferential surface of the shaft rod. The outer diameter of the barrel body of the damping sleeve is smaller than the outer diameter of the socket part. The damping sleeve also has a flange protruding from the outer peripheral surface of the barrel body, and the flange has a second groove corresponding to the first groove to accommodate the clamping strip of the shaft rod, and the damping sleeve is linked with the shaft rod through the action of the flange and the clamping strip.

3. The mechanical multi-stage speed damper according to claim 1, characterized in that: The support shaft has a main body section connected to the substrate and a limiting section extending from the main body section with a gradually decreasing outer diameter for the friction ring to be sleeved. The limiting section is located at the end of the support shaft and has a non-circular anti-rotation hole at the axis. The support module further includes a clamping member having a shaft portion and a clamping portion protruding around the shaft portion. The shaft portion has a connecting section on one side of the clamping portion with a shape matching the anti-rotation hole and accommodated in the anti-rotation hole, and a clamping member screw hole at the axis and screwed with the screw rod. The clamping portion and the limiting section jointly clamp the friction ring and can adjust the clamping tightness.

4. The mechanical multi-stage speed damper according to claim 3, characterized in that: The support module further includes a fixing member screwed on the screw rod, and the fixing member abuts against the shaft portion of the clamping member at the opposite end of the connecting section.

5. The mechanical multi-stage speed damper according to claim 4, characterized in that: The mechanical multi-stage speed damper further includes an adjustment module. The adjustment module includes a rotation control member rotatably provided on the outer surface of the substrate. The rotation control member has a shaft connection portion coaxially arranged with the support shaft, and a control portion connecting the shaft connection portion for a user to apply force to drive the shaft connection portion to rotate. The shaft connection portion has a control member screw hole at the axis and screwed with the screw rod. By rotating the rotation control member to move the screw rod, the clamping member is linked to adjust the clamping tightness of the friction ring.

6. The mechanical multi-stage speed damper according to claim 5, characterized in that: The adjustment module further includes a positioning member provided on the substrate and movably contacting the rotation control member to limit the rotation of the rotation control member.

7. The mechanical multi-stage speed damper according to claim 6, characterized in that: The control unit has a disc-shaped body and a surrounding wall connected to the outer periphery of the body. The surrounding wall has a plurality of card slots arranged in the circumferential direction, and the positioning member has an elastic clamping portion that is elastically displaceable and clamped in one of the card slots.

8. The mechanical multi-stage speed damper according to claim 7, characterized in that: The elastic clamping portion has two elastic arms connected in a V shape and a clamping block located at the junction of the elastic arms. The shape of the clamping block is matched with that of the card slot to be clamped in one of the card slots.

9. The mechanical multi-stage speed damper according to claim 7, characterized in that: The fixed seat further has a limiting ring body extending from the outer surface of the substrate. The limiting ring body has a small-diameter portion connecting the substrate and a large-diameter portion with an outer diameter larger than that of the small-diameter portion and spaced from the substrate. The control unit further has a plurality of clamping pieces arranged at intervals in the circumferential direction and buckled on the large-diameter portion. The clamping pieces can slide relative to the large-diameter portion in the circumferential direction so that the rotation control member is rotatably connected to the fixed seat, and the surrounding wall abuts against the substrate to axially relatively position the rotation control member and the fixed seat.

10. The mechanical multi-stage speed damper according to claim 5, characterized in that: The shaft connecting portion passes through the substrate and extends into the support shaft.

11. The mechanical multi-stage speed damper according to claim 1, characterized in that: The barrel body further has a plurality of oil grooves located on its inner peripheral surface and extending axially for the flow of lubricating oil.

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