Damping device and buffering hinge

Abstract

The damping device comprises a shell and a damping mechanism arranged in the shell, the damping mechanism comprises a first damping assembly and a second damping assembly, the end of the second damping assembly is rotationally installed at the end of the first damping assembly to form a piston body, and an inner cavity of the shell is divided into a first oil cavity and a second oil cavity by the piston body; the second damping assembly is provided with a first through hole communicated with the first oil cavity, the first damping assembly is provided with a second through hole communicated with the second oil cavity, a middle flow channel is arranged between the first damping assembly and the second damping assembly, and the first through hole is communicated with the second through hole through the middle flow channel. The first through hole is formed in the second damping assembly, the flow channel and the second through hole are formed in the first damping assembly, and the length of the middle flow channel between the first through hole and the second through hole is adjusted when the first damping assembly and the second damping assembly rotate relatively, so that the flowing speed and the resistance of damping oil are changed; therefore, the damping force can be adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of hinges, in particular to a damping device and a buffer hinge. Background Art

[0002] Chinese Patent Document No. CN105525812A discloses a hinge device with damping function on April 27, 2016, which includes a first hinge plate and a second hinge plate. Screw holes are provided on the first hinge plate and the second hinge plate. The first hinge plate and the second hinge plate are respectively movably connected to a scroll through a first hinge plate drum and a second hinge plate drum. Plugs are provided at both ends of the scroll. A diameter-reducing part is provided on the part of the scroll corresponding to the first hinge plate drum and the second hinge plate drum. A plurality of damping sheets are radially installed on the diameter-reducing part. When the scroll rotates, the plurality of damping sheets are in frictional contact with the inner walls of the first hinge plate drum and the second hinge plate drum. This hinge device cannot adjust the magnitude of the damping force, so the applicable range of door weight is small.

[0003] Therefore, it is necessary to make further improvements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a damping device and a buffer hinge with simple structure, convenient adjustment, large applicable range of door weight, low cost and strong practicability, so as to overcome the deficiencies of the prior art.

[0005] A damping device designed according to this purpose includes a housing, and is characterized in that: it further includes a damping mechanism arranged in the housing. The damping mechanism includes a first damping component and a second damping component. The end of the second damping component is rotatably installed at the end of the first damping component to form a piston body. The piston body divides the inner cavity of the housing into a first oil cavity and a second oil cavity. A first through hole communicating with the first oil cavity is provided on the second damping component, a second through hole communicating with the second oil cavity is provided on the first damping component, an intermediate flow channel is arranged between the first damping component and the second damping component, and the first through hole communicates with the second through hole through the intermediate flow channel; when the first damping component and the second damping component rotate relative to each other, the length of the intermediate flow channel is adjustable.

[0006] The damping mechanism moves telescopically in the housing. A first sealing ring and a diversion groove communicating with the first oil cavity are arranged between the piston body and the housing. An oil passing groove communicating with the second oil cavity is arranged on the inner side part of the housing; when the damping mechanism extends and moves, the diversion groove is not communicated with the oil passing groove; when the damping mechanism contracts and moves, the diversion groove is communicated with the oil passing groove.

[0007] The first damping assembly includes a first piston rod and a first piston which are separately arranged; a non-circular plug-in hole is arranged on the housing, one end of the first piston rod is non-circular and is axially movably plugged into the plug-in hole, and the other end of the first piston rod is fixedly connected to the first piston; when the housing rotates, the first damping assembly is driven to rotate relative to the second damping assembly to adjust the length of the intermediate flow channel;

[0008] Alternatively, the first damping assembly includes a first piston rod and a first piston, which are integrally arranged to form a first piston body, one end of the first piston body is non-circular, and a non-circular plug-in hole is provided on the shell, one end of the first piston body is non-circular and is axially movably connected to the plug-in hole, and when the shell rotates, the first damping assembly is driven to rotate relative to the second damping assembly to adjust the length of the intermediate flow channel.

[0009] The second damping assembly includes a second piston rod and a second piston; a slot is provided on the first piston, and the second piston is rotatably installed in the slot; one end of the second piston rod is fixedly connected to the second piston, the first through hole is provided on the second piston, and the second through hole is provided on the first piston; an arc-shaped flow channel is provided on the first piston, one end of the flow channel is connected to the second through hole, and the first through hole is connected to the second through hole through the flow channel; when the first damping assembly rotates relative to the second damping assembly, the first through hole slides relatively along the flow channel, and the part of the flow channel that connects the first through hole and the second through hole constitutes an intermediate flow channel.

[0010] It also includes a cover body, which is fixed to the other end of the shell. One end of the second damping component telescopically moves through the cover body and then extends out of the shell. A sealing component is arranged between the cover body and the second damping component. The piston body moves in a limited position in the inner cavity of the shell.

[0011] A buffer hinge designed for this purpose includes a loose-leaf assembly, which includes a first leaf and a second leaf, and is characterized in that it also includes a cam assembly and the damping device; the cam assembly is installed in the first leaf, and includes a cam, a movable shaft and a matching shaft, the movable shaft is movably inserted into the cam, the matching shaft is inserted into the movable shaft, a spirally extending movable groove is provided on the cam, the matching shaft is relatively movably arranged on the movable groove, and the movable shaft is transmission-connected to the second damping assembly; when the loose-leaf assembly rotates, the first leaf drives the cam to rotate, the matching shaft relatively moves on the movable groove, and under the action of the movable groove, the matching shaft drives the movable shaft to move axially, and the movable shaft drives the damping mechanism to move telescopically.

[0012] It further includes a first sleeve and a second sleeve. A first mounting hole is provided on the first blade, and a second mounting hole and a third mounting hole are provided on the second blade. One end of the first sleeve is inserted into the second mounting hole, and the other end is inserted into the first mounting hole. One end of the second sleeve is inserted into the first mounting hole, and the other end is inserted into the third mounting hole. The cam assembly is installed in the first mounting hole and is located between the first sleeve and the second sleeve. A rotation-preventing tooth is provided at one end of the movable shaft, and a mating tooth is provided on the inner side of the first sleeve. The rotation-preventing tooth and the mating tooth are axially slidably engaged with each other, so that the first sleeve drives the movable shaft to rotate.

[0013] It further includes a second elastic member and a first adjusting member. The second elastic member is arranged in the first sleeve, and the first adjusting member is axially adjusted and arranged at one end of the first sleeve. The second elastic member is arranged between the first adjusting member and the movable shaft. When the hinge assembly rotates forward, the movable shaft acts on the second elastic member to compress and store energy and pull out the damping mechanism. When the hinge assembly rotates backward, the second elastic member expands to release energy, and the movable shaft drives the damping mechanism to contract and move.

[0014] It further includes a first cover, a second cover and a second adjusting member. The first cover covers one end of the second mounting hole, and the first cover presses against the first sleeve. When the movable shaft moves upward, it acts on the second elastic member, and the damping mechanism moves upward under the action of the first elastic member. The second cover covers one end of the third mounting hole, and the second cover presses against the second sleeve. The housing is arranged in the second sleeve, and the second adjusting member is axially adjusted and arranged at the other end of the second sleeve. One end of the housing abuts against the second adjusting member.

[0015] It further includes a first elastic member and a cover body. The cover body is fixed to the other end of the housing. One end of the second damping assembly telescopically moves through the cover body and extends out of the housing.

[0016] The first elastic member is arranged on the damping mechanism and acts between the damping mechanism and the housing, or the first elastic member is arranged on the damping mechanism and acts between the movable shaft and the cover body.

[0017] When the movable shaft drives the damping mechanism to extend and move, the first elastic member expands to release energy. When the movable shaft drives the damping mechanism to contract and move, the first elastic member compresses and stores energy.

[0018] The utility model realizes the adjustment of damping force by setting a first through hole on the second damping component, a flow channel and a second through hole on the first damping component, and adjusting the length of the intermediate flow channel between the first through hole and the second through hole when the first damping component and the second damping component rotate relative to each other, thereby changing the flow velocity and resistance of the damping oil, so that the applicable range of the door weight of the buffer hinge is larger and the practicability of the buffer hinge is improved; when adjusting the damping force, only need to insert a hexagonal wrench into the hexagonal hole of the housing and rotate, which makes the adjustment very convenient; in addition, this piston body is also applicable to the adjustment of the resistance size of other structural damping devices and is applicable to various use scenarios, such as hinges, slide rails, sliding doors, various shock absorbers, etc. Description of the Drawings

[0019] Figure 1 It is a cross-sectional view of the damping device in the first application example of an embodiment of the utility model.

[0020] Figure 2 It is an exploded structural schematic diagram of the damping device in the first application example of an embodiment of the utility model.

[0021] Figure 3 It is an overall structural schematic diagram of the damping device in the first application example of an embodiment of the utility model.

[0022] Figure 4 It is an overall structural schematic diagram of the damping mechanism in the first application example of an embodiment of the utility model.

[0023] Figure 5 It is an overall structural schematic diagram of the first piston in the first application example of an embodiment of the utility model.

[0024] Figure 6 It is an overall structural schematic diagram of the buffer hinge in an embodiment of the utility model.

[0025] Figure 7 It is a cross-sectional view of the buffer hinge in the first application example of an embodiment of the utility model.

[0026] Figure 8 It is an exploded structural schematic diagram of the buffer hinge in the first application example of an embodiment of the utility model.

[0027] Figure 9 It is an exploded structural schematic diagram of the cam assembly in an embodiment of the utility model.

[0028] Figure 10 It is an exploded structural schematic diagram of the movable shaft and the first sleeve in the first application example of an embodiment of the utility model.

[0029] Figure 11 It is an exploded structural schematic diagram of the second piston and the second sealing ring in an embodiment of the utility model.

[0030] Figure 12 This is a cross-sectional view of the buffer hinge in the second application example of an embodiment of the present utility model.

[0031] Figure 13 This is a cross-sectional view of the damping device in the second application example of an embodiment of the present utility model.

[0032] Figure 14 This is a schematic diagram of the overall structure of the damping mechanism in the second application example of an embodiment of the present utility model.

[0033] Figure 15 This is a schematic exploded view of the damping device in the third application example of an embodiment of the present utility model.

[0034] Figure 16 This is a schematic exploded view of the movable shaft and the first sleeve in the second application example of an embodiment of the present utility model.

[0035] Figure 17 This is a schematic exploded view of the damping device in the fourth application example of an embodiment of the present utility model. Detailed implementation manners

[0036] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Refer to Figures 1 - 17 , this damping device includes a housing 1 and a damping mechanism C disposed inside the housing 1. The damping mechanism C includes a first damping component a and a second damping component b. The end of the second damping component b is rotatably installed at the end of the first damping component a to form a piston body. The piston body divides the inner cavity of the housing 1 into a first oil chamber 2 and a second oil chamber 3. A first through hole 4 communicating with the first oil chamber 2 is provided on the second damping component b, and a second through hole 60 communicating with the second oil chamber 3 is provided on the first damping component a. An intermediate flow channel is provided between the first damping component a and the second damping component b. The first through hole 4 communicates with the second through hole 60 through the intermediate flow channel. When the first damping component a and the second damping component b rotate relative to each other, the length of the intermediate flow channel is adjustable, thereby changing the flow rate of the damping oil and the magnitude of the resistance. The greater the length of the intermediate flow channel, the smaller the flow rate of the damping oil and the greater the damping force. The smaller the length of the intermediate flow channel, the greater the flow rate of the damping oil and the smaller the damping force.

[0038] The telescopic movement of the damping mechanism C is within the housing 1. A first sealing ring 6 and a diversion groove 52 communicating with the first oil chamber 2 are provided between the piston body and the housing 1. An oil passage groove 7 communicating with the second oil chamber 3 is provided on the inner side of the housing 1. When the damping mechanism C extends, the diversion groove 52 is not communicated with the oil passage groove 7. When the damping mechanism C contracts, the diversion groove 52 is communicated with the oil passage groove 7. When the position of the first sealing ring 6 is higher than the position of the oil passage groove 7, the diversion groove 52 is not communicated with the oil passage groove 7. At this time, there is resistance when the damping mechanism C moves downward and contracts, that is, the damping device maintains a certain resistance to achieve slow closing of the hinge when closing the door. When the position of the first sealing ring 6 is not higher than the position of the oil passage groove 7, the diversion groove 52 is communicated with the oil passage groove 7. At this time, the resistance becomes very small when the damping mechanism C moves downward and contracts, and the damping device has basically no resistance, so that there is no resistance when the hinge closes to the end to achieve rapid closing and locking of the door.

[0039] The first damping component a includes a first piston rod 8 and a first piston 9 that are separately arranged; a non-circular insertion hole 10 is provided on the housing 1. The lower end of the first piston rod 8 is non-circular and is axially movably inserted into the insertion hole 10. The upper end of the first piston rod 8 is riveted to the first piston 9. When the housing 1 rotates, it drives the first damping component a to rotate relative to the second damping component b to adjust the length of the intermediate flow path. A acting part 53 for rotating the housing 1 is provided at the lower end of the housing 1. When the housing 1 rotates, it drives the first damping component a to rotate relative to the second damping component b. The acting part 53 is a hexagonal hole. Insert the hexagonal wrench into the hexagonal hole to rotate the housing 1. Since the insertion hole 10 and the first piston rod 8 are non-circular, the housing 1 can drive the first piston rod 8 and the first piston 9 to rotate when it rotates.

[0040] Alternatively, the first damping component a includes a first piston rod 8 and a first piston 9. The first piston rod 8 and the first piston 9 are integrally arranged to form a first piston body D. One end of the first piston body D is non-circular. A non-circular insertion hole 10 is provided on the housing 1. One end of the first piston body D is non-circular and is axially movably inserted into the insertion hole 10. When the housing 1 rotates, it drives the first damping component a to rotate relative to the second damping component b to adjust the length of the intermediate flow path.

[0041] The insertion hole 10 is directly provided on the housing 1; or, an insert 54 is provided in the housing 1, and the insertion hole 10 is provided on the insert 54.

[0042] An annular groove 36 is provided on the outer periphery of the first piston 9, and the first sealing ring 6 is sleeved on the annular groove 36.

[0043] The second damping assembly b includes a second piston rod 11 and a second piston 12; a slot 14 is provided on the first piston 9, and the second piston 12 is rotatably installed in the slot 14; the lower end of the second piston rod 11 is riveted to the second piston 12, the first through hole 4 is provided on the second piston 12, and the second through hole 60 is provided on the first piston 9; an arc-shaped flow channel 5 is provided on the first piston 9, one end of the flow channel 5 is connected to the second through hole 60, and the first through hole 4 is connected to the second through hole 60 through the flow channel 5; when the first damping assembly a rotates relative to the second damping assembly b, the first through hole 4 slides relatively along the flow channel 5, and the part of the flow channel 5 that conducts the first through hole 4 and the second through hole 60 constitutes an intermediate flow channel.

[0044] The second damping assembly b further comprises a second sealing ring 13, which is arranged between the first piston 9 and the second piston 12. A third through hole 15 is arranged on the second sealing ring 13, and the first through hole 4, the third through hole 15 and the flow channel 5 are connected in sequence.

[0045] A buckle position 37 is provided at the bottom of the slot 14, and a clamping edge 38 is provided at the bottom of the second piston 12. The clamping edge 38 is clamped on the buckle position 37 to realize the rotational connection between the first piston 9 and the second piston 12. An installation groove 39 is provided at the bottom of the first piston 9, and the second sealing ring 13 is installed in the installation groove 39.

[0046] It also includes a cover body 17, which is fixed to the upper end of the shell 1. One end of the second damping component b is telescopically movable through the cover body 17 and then extends out of the shell 1. A sealing component 40 is arranged between the cover body 17 and the second damping component b. The piston body is limited and movable in the inner cavity of the shell 1. When the damping mechanism C moves upward and extends, it is limited on the cover body component 17 by the first piston 9 and the second piston 12; the sealing component 40 includes a third sealing ring 41 and a gasket 42. The third sealing ring 41 plays a sealing role to prevent the damping oil from leaking out of the shell 1.

[0047] The buffer hinge includes a loose-leaf assembly, which includes a first leaf 18 and a second leaf 19, and also includes a cam assembly and the damping device; the cam assembly is installed in the first leaf 18, and includes a cam 20, a movable shaft 21 and a matching shaft 22, the movable shaft 21 is movably arranged on the cam 20, the matching shaft 22 is arranged on the movable shaft 21, a spirally extending movable groove 23 is provided on the cam 20, the matching shaft 22 is relatively movably arranged on the movable groove 23, and the movable shaft 21 is transmission-connected with the second damping assembly b; when the loose-leaf assembly rotates, the first leaf 18 drives the cam 20 to rotate, the matching shaft 22 is relatively movable on the movable groove 23, and under the action of the movable groove 23, the matching shaft 22 drives the movable shaft 21 to move axially up and down on the third through hole 43 of the cam 20, and the movable shaft 21 drives the damping mechanism C to telescope; the buffer hinge adopts an independent damping system, which has lower cost and more stable quality.

[0048] A connecting block 45 is sleeved on the upper end of the second piston rod 11. A buckle 46 is arranged on the connecting block 45, and a buckle hole 47 is arranged at the lower end of the movable shaft 21. The buckle 46 and the buckle hole 47 are buckled with each other, so that the movable shaft 21 is in driving connection with the second damping assembly b.

[0049] Alternatively, a non-circular plug connector 56 is arranged at the upper end of the second piston rod 11, and a non-circular socket 55 is arranged at the lower end of the movable shaft 21. The plug connector 56 and the socket 55 are inserted into each other, so that the movable shaft 21 is in driving connection with the second damping assembly b.

[0050] It further includes a first sleeve 24 and a second sleeve 25. A first mounting hole 26 is arranged on the first blade 18, and second mounting holes 27 and third mounting holes 28 which are distributed up and down are arranged on the second blade 19. The upper end of the first sleeve 24 is in interference fit with the second mounting hole 27 by insertion, and the lower end is movably connected with the first mounting hole 26 (by insertion). The upper end of the second sleeve 25 is movably connected with the first mounting hole 26 (by insertion), and the lower end is in interference fit with the third mounting hole 28 by insertion; the cam assembly is installed in the first mounting hole 26 and is located between the first sleeve 24 and the second sleeve 25. The cam 20 is in interference fit with the first mounting hole 26. A rotation prevention tooth 29 is arranged at one end of the movable shaft 21, and a mating tooth 30 is arranged on the inner side of the first sleeve 24. The rotation prevention tooth 29 and the mating tooth 30 are axially slidably matched with each other, so that the first sleeve 24 drives the movable shaft 21 to rotate.

[0051] A first knurling pattern 57 which is in interference fit with the first mounting hole 26 is arranged on the outer side of the cam 20. A second knurling pattern 58 which is in interference fit with the second mounting hole 27 is arranged on the outer side of the first sleeve 24. A third knurling pattern 59 which is in interference fit with the third mounting hole 28 is arranged on the outer side of the second sleeve 25, preventing relative rotation between them.

[0052] A first pressure bearing 48 is arranged between the first mounting hole 26 and the second mounting hole 27 and the third mounting hole 28 respectively. A second pressure bearing 49 is arranged between the cam 20 and the second sleeve 25. When the cam 20 is pressed, it may move downward. By the second cover 34 pressing against the second sleeve 25, the second sleeve 25 pressing against the second pressure bearing 49, the cam 20 will not move downward and does not affect the rotation of the leaf assembly.

[0053] It further includes a second elastic member 31 and a first adjusting member 33. The second elastic member 31 is arranged inside the first sleeve 24. The first adjusting member 33 is axially adjusted and arranged at one end of the first sleeve 24. The second elastic member 31 is arranged between the first adjusting member 33 and the movable shaft 21. The first adjusting member 33 is an adjusting nut. When the adjusting nut is axially adjusted, the elastic force of the second elastic member 31 is adjusted, thereby adjusting the closing force of the hinge. Through the adjustment of the closing force and the damping force, it is applicable to a large range of door weights and is more convenient for installation and adjustment. When the hinge assembly rotates forward (opens the door), the movable shaft 21 moves upward and compresses and stores energy in the second elastic member 31, and pulls out the damping mechanism C. When the hinge assembly rotates backward (closes the door), the second elastic member 31 expands and releases energy, and the movable shaft 21 drives the damping mechanism C to contract downward. The second elastic member 31 is a spring, and the second elastic member 31 and the damping device are of a split structure and can be detachably replaced.

[0054] It further includes a first cover 32, a second cover 34 and a second adjusting member 35. The first cover 32 covers the upper end of the second mounting hole 27, and the first cover 32 presses against the first sleeve 24. The second cover 34 covers the lower end of the third mounting hole 28, and the second cover 34 presses against the second sleeve 25. The housing 1 is arranged inside the second sleeve 25. The second adjusting member 35 is axially adjusted and arranged at the other end of the second sleeve 25. The lower end of the housing 1 abuts against the second adjusting member 35. The second adjusting member 35 is an adjusting nut. When the adjusting nut is adjusted up and down, the damping device is compressed or stretched. The second cover 34 is provided with a first adjusting hole 50 for adjusting the up and down position of the second cover 34, and the second adjusting member 35 is provided with a second adjusting hole 51 for adjusting the up and down position of the second adjusting member 35. A hexagonal wrench is passed through the first adjusting hole 50 and the second adjusting hole 51 in sequence and then sleeved into the hexagonal hole to rotate the housing 1 to adjust the length of the intermediate flow path between the first through hole 4 and the second through hole 60.

[0055] It further includes a first elastic member 16 and a cover body 17. The cover body 17 is fixed to the other end of the housing 1. One end of the second damping assembly b telescopically moves through the cover body 17 and then extends out of the housing 1. The first elastic member 16 is a spring.

[0056] The first elastic member 16 is arranged on the damping mechanism C and acts between the damping mechanism C (the first piston 9) and the housing 1. The first elastic member 16 is sleeved on the outer periphery of the first piston rod 8. Or, the first elastic member 16 is arranged on the damping mechanism C and acts between the movable shaft 21 and the cover body 17. The first elastic member 16 is sleeved on the outer periphery of the second piston rod 11.

[0057] When the movable shaft 21 drives the damping mechanism C to extend and move, the first elastic member 16 expands and releases energy. When the movable shaft 21 drives the damping mechanism C to contract and move, the first elastic member 16 compresses and stores energy.

[0058] The working principle of the buffer hinge:

[0059] When the door is opened between 0 - 90°, the first vane 18 drives the cam 20 to rotate, so that the movable shaft 21 moves upward, compresses the second elastic member 31 in the second vane 19, increases the elastic force of the second elastic member 31, and under the elastic force of the first elastic member 16 in the damping device, the damping mechanism C follows and extends. When the door is opened between 90 - 150°, the movable shaft 21 remains stationary, and the damping mechanism C remains in place. When the door is opened between 150 - 170°, the movable shaft 21 moves upward, and under the elastic force of the first elastic member 16 in the damping device, the damping mechanism C follows and extends. When closing the door, the movable shaft 21 moves downward under the action of the second elastic member 31 in the second vane 19, so that the cam 20 rotates, and the movable shaft 21 pushes the damping mechanism C to move downward and contract, realizing the process of automatically closing the door slowly - keeping stopped - automatically closing the door slowly.

[0060] The above is the preferred solution of the present invention, which shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A damping device, comprising a housing (1), characterized in that: The invention also comprises a damping mechanism (C) arranged in the housing (1), the damping mechanism (C) comprising a first damping component (a) and a second damping component (b), the end of the second damping component (b) being rotatably mounted on the end of the first damping component (a) to form a piston body, the piston body dividing the inner cavity of the housing (1) into a first oil chamber (2) and a second oil chamber (3), the second damping component (b) being provided with a first through hole (4) communicating with the first oil chamber (2), the first damping component (a) being provided with a second through hole (60) communicating with the second oil chamber (3), an intermediate flow channel being provided between the first damping component (a) and the second damping component (b), the first through hole (4) being connected to the second through hole (60) via the intermediate flow channel; when the first damping component (a) and the second damping component (b) are relatively rotated, the length of the intermediate flow channel is adjustable.

2. The damping device according to claim 1, characterized in that: The damping mechanism (C) telescopes and moves within the housing (1); a first sealing ring (6) and a guide groove (52) communicating with the first oil chamber (2) are provided between the piston body and the housing (1); an oil passage groove (7) communicating with the second oil chamber (3) is provided on the inner side of the housing (1); when the damping mechanism (C) is extended, the guide groove (52) is not connected to the oil passage groove (7); when the damping mechanism (C) is retracted, the guide groove (52) is connected to the oil passage groove (7).

3. The damping device according to claim 1, characterized in that: The first damping component (a) comprises a first piston rod (8) and a first piston (9) which are separately arranged; a non-circular plug-in hole (10) is arranged on the housing (1); one end of the first piston rod (8) is non-circular and is axially movably plugged into the plug-in hole (10); the other end of the first piston rod (8) is fixedly connected to the first piston (9); when the housing (1) rotates, the first damping component (a) is driven to rotate relative to the second damping component (b) to adjust the length of the intermediate flow channel; Alternatively, the first damping component (a) comprises a first piston rod (8) and a first piston (9), the first piston rod (8) and the first piston (9) are integrally arranged to form a first piston body (D), one end of the first piston body (D) is non-circular, a non-circular plug hole (10) is provided on the shell (1), one end of the first piston body (D) is non-circular and is axially movably plugged into the plug hole (10), and when the shell (1) rotates, the first damping component (a) is driven to rotate relative to the second damping component (b) to adjust the length of the intermediate flow channel.

4. The damping device according to claim 3, characterized in that: The second damping assembly (b) comprises a second piston rod (11) and a second piston (12); a slot (14) is provided on the first piston (9), and the second piston (12) is rotatably mounted in the slot (14); one end of the second piston rod (11) is fixedly connected to the second piston (12), the first through hole (4) is provided on the second piston (12), and the second through hole (60) is provided on the first piston (9); an arc-shaped flow channel (5) is provided on the first piston (9), one end of the flow channel (5) is connected to the second through hole (60), and the first through hole (4) is connected to the second through hole (60) through the flow channel (5); when the first damping assembly (a) rotates relative to the second damping assembly (b), the first through hole (4) slides relatively along the flow channel (5), and the portion of the flow channel (5) that connects the first through hole (4) and the second through hole (60) constitutes an intermediate flow channel.

5. The damping device according to claim 4, characterized in that: It also comprises a cover body (17), the cover body (17) being fixed to the other end of the shell (1), one end of the second damping component (b) being telescopically movable to pass through the cover body (17) and then extending out of the shell (1), a sealing component (40) being arranged between the cover body (17) and the second damping component (b), and the piston body being limited and movable in the inner cavity of the shell (1).

6. A buffer hinge, comprising a loose-leaf assembly, the loose-leaf assembly comprising a first leaf piece (18) and a second leaf piece (19), characterized in that: The invention also comprises a cam assembly and a damping device as claimed in any one of claims 1 to 5; the cam assembly is installed in the first leaf (18), and comprises a cam (20), a movable shaft (21) and a matching shaft (22); the movable shaft (21) is movably arranged on the cam (20), the matching shaft (22) is arranged on the movable shaft (21), a spirally extending movable groove (23) is provided on the cam (20), the matching shaft (22) is relatively movably arranged on the movable groove (23), and the movable shaft (21) is transmission-connected with the second damping assembly (b); when the loose-leaf assembly rotates, the first leaf (18) drives the cam (20) to rotate, the matching shaft (22) is relatively movable on the movable groove (23), and under the action of the movable groove (23), the matching shaft (22) drives the movable shaft (21) to move axially, and the movable shaft (21) drives the damping mechanism (C) to move telescopically.

7. The buffer hinge according to claim 6, characterized in that: The invention also comprises a first sleeve (24) and a second sleeve (25); a first mounting hole (26) is provided on the first leaf (18); a second mounting hole (27) and a third mounting hole (28) are provided on the second leaf (19); one end of the first sleeve (24) is plugged into the second mounting hole (27) and the other end is plugged into the first mounting hole (26); one end of the second sleeve (25) is plugged into the first mounting hole (26) and the other end is plugged into the third mounting hole (28); the cam assembly is installed in the first mounting hole (26) and is located between the first sleeve (24) and the second sleeve (25); a stop tooth (29) is provided at one end of the movable shaft (21); a matching tooth (30) is provided on the inner side of the first sleeve (24); the stop tooth (29) and the matching tooth (30) are axially slidably matched with each other, so that the first sleeve (24) drives the movable shaft (21) to rotate.

8. The buffer hinge according to claim 7, characterized in that: The invention also comprises a second elastic member (31) and a first adjusting member (33), wherein the second elastic member (31) is arranged in the first sleeve (24), the first adjusting member (33) is axially adjustable at one end of the first sleeve (24), and the second elastic member (31) is arranged between the first adjusting member (33) and the movable shaft (21); when the movable leaf assembly rotates in the forward direction, the movable shaft (21) acts on the second elastic member (31) to compress and store energy and pull out the damping mechanism (C); when the movable leaf assembly rotates in the reverse direction, the second elastic member (31) stretches and releases energy, and the movable shaft (21) drives the damping mechanism (C) to contract and move.

9. The buffer hinge according to claim 8, characterized in that: The housing (1) further comprises a first cover (32), a second cover (34) and a second adjusting member (35); the first cover (32) covers one end of the second mounting hole (27), and the first cover (32) presses against the first sleeve (24); the second cover (34) covers one end of the third mounting hole (28), and the second cover (34) presses against the second sleeve (25); the housing (1) is arranged in the second sleeve (25), the second adjusting member (35) is axially adjustable and arranged at the other end of the second sleeve (25), and one end of the housing (1) presses against the second adjusting member (35).

10. The buffer hinge according to claim 6, characterized in that: It also comprises a first elastic member (16) and a cover body (17), wherein the cover body (17) is fixed to the other end of the shell (1), and one end of the second damping component (b) is telescopically movable to pass through the cover body (17) and then extend out of the shell (1); The first elastic member (16) is arranged on the damping mechanism (C) and acts between the damping mechanism (C) and the housing (1); or the first elastic member (16) is arranged on the damping mechanism (C) and acts between the movable shaft (21) and the cover body (17); When the movable shaft (21) drives the damping mechanism (C) to extend and move, the first elastic member (16) stretches and releases energy; when the movable shaft (21) drives the damping mechanism (C) to contract and move, the first elastic member (16) compresses and stores energy.

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