Piston head, damping tube and damper

Abstract

The utility model discloses a piston head, a damping tube and a damper. The piston head comprises an oil piston and an adjusting piece, the oil piston comprises a piston body and a protruding part, a damping valve is arranged on the piston body, and the protruding part is connected to the first end of the piston body; the adjusting part is arranged on the protruding part, a valve port is formed between the first end of the piston body and the adjusting part, the valve port communicates with the damping valve and is used for allowing hydraulic oil to flow, the side, away from the piston body, of the adjusting part is a pressed side, and the adjusting part can deform and / or move towards the piston body from the initial state according to the oil pressure borne by the pressed side so that the valve port can become small. Therefore, the size of the valve port of the piston head can be adaptively adjusted according to the weight of the door and window sash, so that the actual damping force of the damping tube can be automatically matched with the door and window sashes with different weights.

Description

Technical Field

[0001] The utility model relates to the technical field of hardware accessories, in particular to a piston head, a damping tube and a damper. Background Art

[0002] Dampers are usually installed on some sliding door and window systems (such as closet doors) for buffering. The dampers are set on the upper and / or lower sides of the door and window sashes. When the door and window sashes are opened or closed, the dampers can assist in opening or closing, thereby reducing collisions and noise. The damping force of the damper must be adapted to the weight of the door and window sashes to achieve the best buffering effect; when the damping force of the damper is small and the door and window sashes are heavier, the door and window sashes will move faster, and may even collide with the door frame when moving toward the side of the door frame, thereby generating noise and causing damage to the door and window sashes, and failing to achieve a good buffering effect.

[0003] Therefore, in order to meet the needs of the market, it is necessary to improve the damping tube of the existing damper and produce a damping tube that can adapt to door and window sashes of different weights. Utility Model Content

[0004] In order to overcome at least one of the defects of the above-mentioned prior art, the present invention provides a piston head, a damping tube and a damper, aiming to solve the problem that the existing damping tube cannot adapt to door and window sashes of different weights.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A piston head, applied to a damping tube, comprises: an oil piston, comprising a piston body and a raised portion, wherein a damping valve is provided on the piston body, and the raised portion is connected to the first end of the piston body; an adjusting member, arranged on the raised portion, a valve port is formed between the first end of the piston body and the adjusting member, the valve port is connected to the damping valve and is used to supply hydraulic oil to flow, the side of the adjusting member away from the piston body is a pressure side, and the adjusting member can be deformed and / or moved from an initial state toward the piston body according to the oil pressure applied to the pressure side to make the valve port smaller.

[0007] By adopting the above scheme, when the damping tube moves to a certain position along with the door and window sash toward the side of the door frame, the piston head will slide in the cylinder of the damping tube to compress the hydraulic oil, and the hydraulic oil will flow from one oil chamber thereof through the valve port of the piston head and the damping valve to the other oil chamber in sequence. The damping force of the damping tube is positively correlated with the size of the valve port. If the weight of the door and window sash is large and the initial damping force of the damping tube is small, the movement speed of the door and window sash will be faster, and the relative movement speed between the piston head and the cylinder of the damping tube will also be faster, which will cause the pressure side of the adjusting member to be subjected to greater oil pressure. The adjusting member will deform and / or move from the initial state toward the direction close to the piston body according to the oil pressure on the pressure side to make the valve port smaller. As the valve port becomes smaller , the actual damping force of the damping tube will increase, the relative movement speed between the piston head and the cylinder of the damping tube will be slowed down, and the movement speed of the door and window sashes will also be slowed down. Moreover, the greater the weight of the door and window sashes, the greater the deformation and / or movement of the adjusting member, the smaller the valve opening, and the greater the damping force of the damping tube; if the weight of the door and window sashes is adapted to the initial damping force of the damping tube, the pressure on the pressure side of the adjusting member does not reach the threshold value, the adjusting member can be maintained in the initial state, the size of the valve opening does not change, and the movement of the door and window sashes is also relatively smooth; in this way, the size of the valve opening of the piston head can be adaptively adjusted according to the weight of the door and window sashes, and the actual damping force of the damping tube can be automatically matched with door and window sashes of different weights.

[0008] According to some embodiments of the present invention, the regulating member is a baffle, which is connected to the outer peripheral side of the protrusion in a surrounding manner, and the valve port is formed between the first end of the piston body and the baffle.

[0009] According to some embodiments of the present invention, the blocking piece is elastic.

[0010] According to some embodiments of the present invention, the raised portion includes a rod and a head, one end of the rod is connected to the first end of the piston body, and the baffle is connected to the outer peripheral side of the rod; the head is connected to the rod, and the head has a first limiting wall opposite to the baffle, and the first limiting wall can be against the baffle.

[0011] According to some embodiments of the present invention, the head has a guide wall opposite to the first limiting wall, and the guide wall is arc-shaped.

[0012] According to some embodiments of the present invention, the damping valve includes a damping oil hole, which is provided in the piston body along the axial direction of the piston body and is communicated with the valve port.

[0013] According to some embodiments of the present invention, there are several damping oil holes, the first end of the piston body has an oil guiding end surface opposite to the baffle, the damping oil hole passes through the oil guiding end surface, at least one of the damping oil holes is connected to the oil guiding notch, the oil guiding notch is formed on the oil guiding end surface, and the oil guiding notch is located between the damping oil hole and the outer peripheral side of the piston body.

[0014] According to some embodiments of the present invention, the first end of the piston body has an oil-conducting end surface opposite to the baffle, the damping oil hole penetrates into the oil-conducting end surface, and the oil-conducting end surface is provided with a protrusion.

[0015] According to some embodiments of the present invention, the protrusion is located on the periphery of the oil-guiding end surface.

[0016] According to some embodiments of the present invention, the blocking piece is provided with an anti-blocking opening, and the anti-blocking opening is communicated with the damping oil hole.

[0017] According to some embodiments of the present invention, the anti-blocking opening is opened on the outer peripheral side of the blocking piece.

[0018] In addition, the utility model also provides a damping tube, comprising the piston head as described above, and also comprising a cylinder and a piston rod; the piston head is slidably arranged inside the cylinder to divide the cavity inside the cylinder into a first oil chamber and a second oil chamber, and the piston rod penetrates into the first oil chamber from one end of the cylinder and is connected to the piston body; the adjusting member is located in the second oil chamber, and the first oil chamber, the damping valve, the valve port and the second oil chamber are connected in sequence; wherein, when the piston head moves in the direction of compressing the hydraulic oil in the second oil chamber, the adjusting member can be deformed and / or moved from the initial state toward the piston body according to the oil pressure applied to the pressurized side, so that the valve port becomes smaller.

[0019] According to some embodiments of the present invention, the damping tube further includes a toggle block connected to one end of the piston rod exposed from the cylinder, and the toggle block is used to cooperate with a damping toggle member provided on the door guide rail.

[0020] In addition, the present invention also provides a damper for a sliding door and window system, comprising the damping tube as described above, wherein the damping tube is used to be arranged on the upper side and / or lower side of the door and window sash. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of the damping tube in Example 1 of the utility model when the adjusting member is in the initial state;

[0022] Figure 2 for Figure 1 A partial enlarged view of part A in the middle;

[0023] Figure 3 This is a schematic structural diagram of the damping tube according to the first embodiment of the present invention when the adjusting member is deformed and / or moved toward the piston body;

[0024] Figure 4 for Figure 3 A partial enlarged view of part B in the middle;

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the damping tube (the cylinder is not shown) of Example 1 of the present utility model;

[0026] Figure 6 This is a schematic structural diagram of the piston head of Example 1 of the present utility model;

[0027] Figure 7 This is a structural diagram of the piston head of Example 2 of the present utility model;

[0028] Figure 8 This is a schematic structural diagram of the piston head of Example 3 of the present utility model;

[0029] Figure 9 This is a structural schematic diagram of the piston head of Example 4 of the present utility model.

[0030] The meanings of the reference numerals are as follows:

[0031] 1-cylinder, 11-first oil chamber, 12-second oil chamber, 2-piston rod, 3-oil piston, 31-piston body, 311-oil guide end face, 312-oil guide notch, 313-protrusion, 32-protrusion, 321-head, 3211-first limiting wall, 3212-guide wall, 322-rod, 4-damping valve, 41-damping oil hole, 5-adjusting member, 51-blocking plate, 511-pressure side, 512-anti-blocking port, 6-guide member, 7-toggle block, 8-valve port. DETAILED DESCRIPTION

[0032] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] See also Figures 1 to 6 The utility model discloses a piston head and a damping tube including the piston head. The damping tube also includes a cylinder 1 and a piston rod 2. The piston head is used to be slidably arranged inside the cylinder 1 to separate the cavity inside the cylinder 1 into a first oil chamber 11 and a second oil chamber 12.

[0038] Furthermore, the piston head includes an oil piston 3 and an adjusting member 5; the oil piston 3 includes a piston body 31 and a protrusion 32, the piston body 31 is provided with a damping valve 4, and the protrusion 32 is connected to the first end of the piston body 31; the adjusting member 5 is arranged on the protrusion 32, and a valve port 8 is formed between the first end of the piston body 31 and the adjusting member 5, the valve port 8 is connected to the damping valve 4 and is used to supply hydraulic oil flow, and the side of the adjusting member 5 away from the piston body 31 is the pressure side 511, and the adjusting member 5 can be deformed and / or moved from the initial state toward the piston body 31 according to the oil pressure applied to the pressure side 511 to make the valve port 8 smaller.

[0039] Specifically, in this embodiment, the piston body 31 is slidably arranged in the cavity inside the cylinder 1, the piston rod 2 penetrates into the first oil chamber 11 from one end of the cylinder 1 and is connected to the piston body 31, the adjusting member 5 is located in the second oil chamber 12, and the first oil chamber 11, the damping valve 4, the valve port 8 and the second oil chamber 12 are connected in sequence.

[0040] In this way, by adopting the above scheme, the hydraulic oil is sealed in the first oil chamber 11 and the second oil chamber 12, and the hydraulic oil can flow between the first oil chamber 11 and the second oil chamber 12 through the damping valve 4 and the valve port 8; when the piston head and the cylinder 1 make relative movement, the volume of the first oil chamber 11 and the second oil chamber 12 also changes accordingly. Specifically, when the piston head moves in the direction of compressing the hydraulic oil in the second oil chamber 12, the volume of the second oil chamber 12 becomes smaller, and the volume of the first oil chamber 11 becomes larger, and the hydraulic oil flows from the second oil chamber 12 to the first oil chamber 11 through the valve port 8 and the damping valve 4 in sequence; when the piston head moves in the direction of compressing the hydraulic oil in the first oil chamber 11, the volume of the first oil chamber 11 becomes smaller, and the volume of the second oil chamber 12 becomes larger, and the hydraulic oil flows from the first oil chamber 11 to the second oil chamber 12 through the damping valve 4 and the valve port 8 in sequence.

[0041] It can be understood that when the damping tube moves to a certain position along with the door and window sash toward the side of the door frame, the piston head moves in the direction of compressing the hydraulic oil in the second oil chamber 12, the volume of the second oil chamber 12 becomes smaller, and the volume of the first oil chamber 11 becomes larger, and the hydraulic oil flows from the second oil chamber 12 to the first oil chamber 11 to provide a damping buffering function. The damping force of the damping tube is positively correlated with the size of the valve port 8, such as Figure 3 and Figure 4 As shown, if the weight of the door and window sash is large and the initial damping force of the damping tube is small, the movement speed of the door and window sash will be faster, and the relative movement speed between the piston head and the cylinder 1 will also be faster, which will cause the pressure side 511 of the adjusting member 5 to be subjected to a larger oil pressure in the second oil chamber 12. The adjusting member 5 will deform and / or move from the initial state toward the direction close to the piston body 31 according to the oil pressure on the pressure side 511 to make the valve port 8 smaller. Since the valve port 8 is smaller, the actual damping force of the damping tube will increase, the relative movement speed between the piston head and the cylinder 1 will be slowed down, and the movement speed of the door and window sash will also be slowed down. In addition, the greater the weight of the door and window sash, the greater the deformation and / or movement amplitude of the adjusting member 5, the smaller the valve port 8, and the greater the damping force of the damping tube. Figure 1 and Figure 2 As shown, if the weight of the door and window sash is adapted to the initial damping force of the damping tube, the pressure on the pressure side 511 of the adjusting member 5 in the second oil chamber 12 does not reach the threshold value, the adjusting member 5 can be maintained in the initial state, the size of the valve port 8 does not change, and the movement of the door and window sash is relatively smooth; in this way, the size of the valve port 8 of the piston head can be adaptively adjusted according to the weight of the door and window sash, and the actual damping force of the damping tube can be automatically matched with door and window sashes of different weights.

[0042] like Figure 1 and Figure 3 As shown, more specifically, in this embodiment, the damping tube also includes a toggle block 7, and the end of the piston rod 2 exposed from the cylinder 1 is connected to the toggle block 7. When the damping tube moves to a certain position along with the door and window sash toward the side of the door frame, the toggle block 7 will encounter the obstruction of the damping toggle member set on the door guide rail. The toggle block 7 cannot continue to move relative to the damping toggle member, but the toggle block 7 can move relative to the cylinder 1 to drive the piston rod 2 to move. Driven by the piston rod 2, the piston head can move in the direction of compressing the hydraulic oil in the second oil chamber 12 to provide a damping buffering function.

[0043] It should be noted that, in some other embodiments, the toggle block 7 may also be provided on the cylinder 1. When the damping tube moves to a certain position along with the door and window sash toward the side wall of the door frame, the toggle block 7 will encounter obstruction by the damping toggle member provided on the door guide rail. The toggle block 7 cannot continue to move relative to the damping toggle member, but the toggle block 7 can drive the cylinder 1 to move relative to the piston head, and the hydraulic oil in the second oil chamber 12 can be compressed to provide a damping buffering function.

[0044] like Figure 2 and Figure 4 As shown, preferably, in this embodiment, the adjusting member 5 is a baffle 51, which is connected to the outer peripheral side of the protrusion 32 in a surrounding manner, and the first end of the piston body 31 is opposite to the baffle 51. The valve port 8 is formed between the first end of the piston body 31 and the baffle 51. The above-mentioned pressure side 511 is the side of the baffle 51 away from the piston body 31. When the hydraulic oil flows from the second oil chamber 12 to the first oil chamber 11 and the pressure on the pressure side 511 of the baffle 51 rises to a threshold value, the baffle 51 can be deformed and / or moved toward the piston body 31. In this way, the size of the valve port 8 can be adjusted by using the sheet-shaped baffle 51, which has a simple structure, easy function implementation and low production cost.

[0045] It should be noted that, in some other embodiments, the adjusting member 5 may also be, but is not limited to, a block or a bar, etc., which can be selected according to actual needs.

[0046] Preferably, in this embodiment, the baffle 51 is elastic and is fixed to the protrusion 32. When the piston head moves in the direction of compressing the hydraulic oil in the second oil chamber 12, the baffle 51 can be elastically deformed from the initial state toward the piston body 31 according to the pressure received, so that the valve port 8 becomes smaller, thereby making the size adjustment of the valve port 8 more sensitive and accurate.

[0047] Specifically, in this embodiment, the piston body 31 forms a seal with the side wall of the cavity in the cylinder 1, the radius of the baffle 51 is slightly smaller than the radius of the second oil chamber 12, and there is a gap between the peripheral side of the baffle 51 and the side wall of the second oil chamber 12, and the hydraulic oil flows into or out of the valve port 8 through the gap.

[0048] like Figure 2 and Figure 4 As shown, preferably, in this embodiment, the protrusion 32 includes a rod 322 and a head 321, one end of the rod 322 is connected to the first end of the piston body 31, and the other end of the rod 322 is connected to the above-mentioned head 321, and the baffle 51 is connected to the outer peripheral side of the rod 322. The head 321 has a first limiting wall 3211 opposite to the baffle 51, and the first limiting wall 3211 can be abutted against the baffle 51 to avoid the problem of the baffle 51 falling off from the rod 322 due to the impact of the hydraulic oil.

[0049] It should be noted that, in some other embodiments, the protrusion 32 may only include the stem portion 322 but not the head portion 321 .

[0050] Preferably, in this embodiment, the head 321 also has a guide wall 3212 opposite to the first limiting wall 3211. Specifically, the guide wall 3212 protrudes in a direction away from the first limiting wall 3211, and the guide wall 3212 is arc-shaped to reduce the impact of the hydraulic oil on the protrusion 32, thereby improving the stability of the protrusion 32.

[0051] like Figure 2 、 Figure 4 and Figure 6 As shown, preferably, in this embodiment, the damping valve 4 includes a damping oil hole 41, which is arranged in the piston body 31 along the axial direction of the piston body 31, and the damping oil hole 41 connects the first oil chamber 11 and the valve port 8. In this way, the hydraulic oil moves between the first oil chamber 11 and the second oil chamber 12 through the damping oil hole 41 and the valve port 8.

[0052] Specifically, in this embodiment, three damping oil holes 41 are provided. The first end of the piston body 31 has an oil-conducting end surface 311 opposite the baffle 51. The damping oil holes 41 extend through the oil-conducting end surface 311. Preferably, at least one damping oil hole 41 communicates with an oil-conducting notch 312 formed in the oil-conducting end surface 311 and located between the damping oil hole 41 and the outer circumference of the piston body 31. This prevents the formation of a seal between the baffle 51 and the oil-conducting end surface 311, thereby preventing hydraulic oil blockage. More specifically, the three damping oil holes 41 are arranged around the piston body 31, each having a waist-shaped cross-section along the axial direction of the piston body 31. It should be noted that in other embodiments, the number of damping oil holes 41 may be, but is not limited to, one, two, or four, as long as at least one damping oil hole 41 is connected to the oil-conducting notch 312.

[0053] like Figure 1 、 Figure 3 and Figure 5 As shown, preferably, in this embodiment, the damping tube also includes a guide member 6, which is fixed to the first oil chamber 11, and the piston rod 2 is inserted into the guide member 6. The piston rod 2 and the guide member 6 are in a sliding fit, and the guide member 6 can provide guidance for the movement of the piston rod 2.

[0054] Secondly, this embodiment also discloses a damper, which is used for a sliding door and window system, including the damping tube as described above, and also including a shell, which is used to be fixed on the upper side and / or lower side of the door and window sash, and the cylinder 1 is arranged in the shell, and the cylinder 1 is relatively fixed on the upper side and / or lower side of the door and window sash through the shell.

[0055] Again, this embodiment also discloses a sliding door and window system, including a door frame, door and window sashes, door guide rails and a damping toggle member, and also includes the damper as described above, the damper is provided on the upper side and / or lower side of the door and window sashes, the door frame is used to be set in the door opening, the door guide rail is set on the door frame and is used to guide the sliding of the door and window sashes, the damping toggle member is fixed on the door guide rail, when the damper follows the door and window sashes to move toward the side of the door frame to a certain position, the toggle block 7 of the damping tube is blocked by the damping toggle member so that the damping tube can play a damping and buffering function.

[0056] Example 2

[0057] like Figure 7 As shown, the main difference between this embodiment and the first embodiment is that a protrusion 313 is provided on the oil guiding end surface 311; thus, there is no need to provide an oil guiding notch 312 on the oil guiding end surface 311. When the baffle 51 is deformed or moved toward the piston body 31, a seal can be avoided between the baffle 51 and the oil guiding end surface 311, thereby avoiding the problem of hydraulic oil blockage, and the structural strength of the piston body 31 is also improved.

[0058] Preferably, in this embodiment, a plurality of protrusions 313 are provided, and at least one such protrusion 313 is provided between two adjacent damping oil holes 41 to further prevent clogging.

[0059] Example 3

[0060] like Figure 8 As shown, the main difference between this embodiment and the first and second embodiments is that a through-blocking opening 512 is provided on the baffle 51, and the anti-blocking opening 512 is communicated with the damping oil hole 41; thus, there is no need to provide an oil guide notch 312 and a protrusion 313 on the oil guide end surface 311, and when the baffle 51 is deformed or moved toward the piston body 31, a seal can also be avoided between the baffle 51 and the oil guide end surface 311, thereby avoiding the problem of hydraulic oil blockage.

[0061] Preferably, in this embodiment, a plurality of anti-blocking openings 512 are provided, and the plurality of anti-blocking openings 512 and the plurality of damping oil holes 41 are provided in a one-to-one correspondence.

[0062] Specifically, in this embodiment, the anti-blocking opening 512 is a circular hole, an elliptical hole, a polygonal hole, etc. that is set through, which can be selected according to actual needs and is not limited here.

[0063] Example 4

[0064] like Figure 9As shown, the main difference between this embodiment and the third embodiment is that the anti-blocking opening 512 is opened on the outer peripheral side surface of the baffle 51, that is, the anti-blocking opening 512 is formed by a depression on the outer peripheral side surface of the baffle 51; in this way, when the baffle 51 is deformed or moved toward the piston body 31, the formation of a seal between the baffle 51 and the oil guide end surface 311 can also be avoided, thereby avoiding the problem of hydraulic oil blockage, and also avoiding the normal operation of the baffle 51 being affected by the setting of the anti-blocking opening 512.

[0065] In summary, the piston head, damping tube, and damper disclosed in the present invention can at least bring the following beneficial technical effects:

[0066] 1) The size of the valve port 8 of the piston head can be adaptively adjusted according to the weight of the door and window sash, so that the actual damping force of the damping tube can automatically match the door and window sashes of different weights;

[0067] 2) The size of the valve port 8 can be adjusted by using the sheet-shaped baffle 51, which has a simple structure, easy function implementation and low production cost;

[0068] 3) The first limiting wall 3211 can abut against the blocking piece 51 to prevent the blocking piece 51 from falling off the rod portion 322 due to the impact of the hydraulic oil;

[0069] 4) The provision of the oil guide notch 312 can prevent a seal from being formed between the baffle 51 and the oil guide end surface 311 , thereby avoiding the problem of hydraulic oil blockage.

[0070] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. Piston head, applied to damping tube, characterized by: include: An oil piston (3) comprises a piston body (31) and a raised portion (32), wherein a damping valve (4) is provided on the piston body (31), and the raised portion (32) is connected to a first end of the piston body (31); An adjusting member (5) is arranged on the raised portion (32); a valve port (8) is formed between the first end of the piston body (31) and the adjusting member (5); the valve port (8) is connected to the damping valve (4) and is used for allowing hydraulic oil to flow; the side of the adjusting member (5) away from the piston body (31) is a pressure-receiving side (511); and the adjusting member (5) can be deformed and / or moved from an initial state toward the piston body (31) according to the oil pressure received by the pressure-receiving side (511) to reduce the valve port (8).

2. The piston head according to claim 1, characterized in that: The regulating member (5) is a baffle (51), which is connected to the outer peripheral side of the protrusion (32) in a surrounding manner, and the valve port (8) is formed between the first end of the piston body (31) and the baffle (51).

3. The piston head according to claim 2, characterized in that: The blocking piece (51) is elastic.

4. The piston head according to claim 2, characterized in that: The protrusion (32) includes a rod (322) and a head (321), one end of the rod (322) is connected to the first end of the piston body (31), and the baffle (51) is connected to the outer peripheral side of the rod (322); the head (321) is connected to the rod (322), and the head (321) has a first limiting wall (3211) opposite to the baffle (51), and the first limiting wall (3211) can be against the baffle (51).

5. The piston head according to claim 4, characterized in that: The head (321) has a guide wall (3212) opposite to the first limiting wall (3211), and the guide wall (3212) is arc-shaped.

6. The piston head according to any one of claims 2 to 5, characterized in that: The damping valve (4) comprises a damping oil hole (41), which is provided in the piston body (31) and penetrates the piston body (31) in the axial direction thereof, and is communicated with the valve port (8).

7. The piston head according to claim 6, characterized in that The damping oil holes (41) are provided in a plurality, the first end of the piston body (31) has an oil guide end surface (311) opposite to the baffle (51), the damping oil hole (41) penetrates the oil guide end surface (311), at least one of the damping oil holes (41) is communicated with an oil guide notch (312), the oil guide notch (312) is formed on the oil guide end surface (311), and the oil guide notch (312) is located between the damping oil hole (41) and the outer peripheral side of the piston body (31).

8. The piston head according to claim 6, characterized in that The first end of the piston body (31) has an oil guiding end surface (311) opposite to the blocking plate (51), the damping oil hole (41) penetrates the oil guiding end surface (311), and the oil guiding end surface (311) is provided with a protrusion (313).

9. The piston head according to claim 8, characterized in that The protrusion (313) is located on the periphery of the oil guide end surface (311).

10. The piston head according to claim 6, characterized in that The blocking piece (51) is provided with an anti-blocking opening (512), and the anti-blocking opening (512) is communicated with the damping oil hole (41).

11. The piston head according to claim 10, characterized in that: The anti-blocking opening (512) is opened on the outer peripheral side of the blocking piece (51).

12. Damping tube, characterized in that, The invention comprises a piston head according to any one of claims 1 to 11, and further comprises a cylinder (1) and a piston rod (2); the piston head is slidably arranged inside the cylinder (1) to separate the cavity inside the cylinder (1) into a first oil chamber (11) and a second oil chamber (12); the piston rod (2) penetrates the first oil chamber (11) from one end of the cylinder (1) and is connected to the piston body (31); The regulating member (5) is located in the second oil chamber (12), and the first oil chamber (11), the damping valve (4), the valve port (8) and the second oil chamber (12) are connected in sequence; wherein, when the piston head moves in a direction of compressing the hydraulic oil in the second oil chamber (12), the regulating member (5) can be deformed and / or moved from an initial state toward the piston body (31) according to the oil pressure applied to the pressure side (511), so as to reduce the valve port (8).

13. The damper tube according to claim 12, characterized in that: The damping tube further comprises a toggle block (7), which is connected to one end of the piston rod (2) exposed from the cylinder (1), and is used to cooperate with a damping toggle member provided on the door guide rail.

14. Damper for sliding door and window system, characterized in that, The damping tube comprises the damping tube as claimed in claim 12 or 13, wherein the damping tube is used to be arranged on the upper side and / or the lower side of the door or window sash.

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