A hydraulic buffer

Abstract

The present invention discloses a hydraulic buffer, belonging to the technical field of buffer devices. It includes a cylinder barrel and a piston block installed in the cylinder barrel. A piston rod is fixedly connected to the piston block along its own axial direction, and one end of the piston rod away from the piston block extends to the outside of the cylinder barrel. An oil flow hole communicating the spaces on both sides of the piston block is opened on the piston block, and an adjusting assembly is further arranged on the piston block. The adjusting assembly adjusts the effective aperture of the oil flow hole according to the moving speed of the piston block; for the hydraulic buffer provided by the present invention, by arranging an adjusting assembly capable of adjusting the effective aperture of the oil flow hole in the oil flow hole, when the moving speed of the piston block in the cylinder barrel is faster, the adjusting assembly will adjust the effective aperture of the oil flow hole to be smaller, thereby increasing the moving resistance of the piston block and realizing the adaptive adjustment of the buffering effect of the buffer, so as to adapt to different buffering working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of buffer devices, and specifically discloses a hydraulic buffer. Background Art

[0002] Hydraulic buffers can effectively reduce or eliminate the impact and vibration of mechanical equipment during movement, protecting the equipment and workpieces from damage; in the field of mechanical equipment, hydraulic buffers are usually applied to high-speed moving components, such as machine tools, numerical control equipment, punching presses, etc.; common hydraulic buffers mainly include a cylinder block assembly and a piston assembly. The cylinder block assembly is filled with hydraulic oil, and the piston is provided with oil flow holes that connect the spaces on both sides thereof. When the piston moves, the oil on one side of the piston is squeezed and reaches the other side of the piston through the oil flow holes, thereby generating hydraulic damping to absorb kinetic energy, so as to achieve the buffering purpose.

[0003] For example, the patent with the publication number CN108006141B and the publication date of July 14, 2020 discloses a hydraulic buffer, belonging to the field of buffers. The hydraulic buffer includes: a cylinder barrel, a first end cover, a second end cover, a damping core shaft, an adjusting sleeve, a piston rod, a damping ring and a piston. The first end cover and the second end cover are respectively installed on two end faces of the cylinder barrel. The first end cover, the cylinder barrel and the second end cover form a chamber for accommodating a fluid medium. The second end cover is provided with an accumulator interface communicating with the chamber. The damping core shaft includes a driving installation section and a damping section. The first end of the driving installation section extends out of the first end cover, and the second end of the driving installation section is connected to the first end of the damping section. The damping section is arranged in the chamber. The hydraulic buffer rotates the damping core shaft, and according to different gear buffering conditions required by the load, selects damping grooves with different cross-sections to be aligned with the adjusting through holes, thereby generating different damping forces, and further enabling the hydraulic buffer to adjust its buffering ability according to the load.

[0004] In the existing hydraulic buffer, due to the fixed aperture of the oil flow port opened on the piston, the damping value generated by the piston squeezing the oil is fixed, resulting in that the hydraulic buffer can only be applicable to a certain buffering condition, and the buffering effect is poor. Summary of the Invention

[0005] The purpose of the present invention is to provide a hydraulic buffer.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A hydraulic buffer includes a cylinder barrel and a piston block installed in the cylinder barrel. A piston rod is fixedly connected to the piston block along its own axial direction. One end of the piston rod far from the piston block extends to the outside of the cylinder barrel. The piston block is provided with oil flow holes that connect the spaces on both sides thereof. The piston block is further provided with an adjusting component, and the adjusting component adjusts the effective aperture of the oil flow holes according to the moving speed of the piston block.

[0008] In the above hydraulic buffer, the adjusting assembly includes a spring piece arranged on the piston block, and the spring piece deforms under force to reduce the effective aperture of the oil flow hole.

[0009] In the above hydraulic buffer, the spring piece includes an arc section and horizontal sections connected to both ends of the arc section, and one of the horizontal sections is connected to the piston block.

[0010] In the above hydraulic buffer, a disc is rotatably installed in the piston block. A small hole is radially formed in the disc along its own radial direction, and the small hole is correspondingly formed with the oil flow hole. The spring piece is arranged in the disc. A transmission member for driving the disc to rotate self is arranged on the piston block. When the piston block moves to the end of its stroke along the cylinder barrel, the transmission member drives the disc to rotate self by half a turn.

[0011] In the above hydraulic buffer, the transmission member includes an adjusting rod slidably installed on the piston block. The length of the adjusting rod is greater than the axial dimension of the piston block. A rotating shaft is coaxially arranged on one side of the disc. The rotating shaft extends towards the side where the adjusting rod is located, and a gear is fixedly connected to the end of the rotating shaft far from the disc. The middle part of the adjusting rod is a rack, and the rack meshes with the gear.

[0012] In the above hydraulic buffer, blocking pieces are fixedly connected to both ends of the adjusting rod, and grooves for accommodating the blocking pieces are formed on both end faces of the piston block.

[0013] In the above hydraulic buffer, two groups of arc-shaped grooves are formed on the side wall of the disc along its circumferential direction, and the two arc-shaped grooves are respectively communicated with both ends of the small hole.

[0014] In the above hydraulic buffer, the rotating shaft is slidably installed on the disc. A first spring for maintaining the coaxiality of the rotating shaft and the disc is arranged on the disc. An adjusting member is also arranged on the piston block, and the adjusting member drives the rotating shaft to slide so that the gear moves away from the adjusting rod.

[0015] In the above hydraulic buffer, the adjusting member includes an extrusion rod slidably installed on the piston block, and a wedge block for driving the rotating shaft to slide is arranged at one end of the extrusion rod.

[0016] In the above hydraulic buffer, there are two piston rods, and the two piston rods are respectively connected to both end faces of the piston block. One of the piston rods is of a hollow structure, and an adjusting knob is threadedly connected to the hollow piston rod. The extrusion rod extends into the piston rod and abuts against the adjusting knob. A second spring for maintaining the relative position of the extrusion rod and the piston rod is arranged in the piston rod.

[0017] In the above technical solution, for the hydraulic buffer provided by the present invention, by arranging an adjusting assembly capable of adjusting the effective aperture of the oil flow hole in the oil flow hole, when the moving speed of the piston block in the cylinder barrel is faster, the adjusting assembly adjusts the effective aperture of the oil flow hole to be smaller, thereby increasing the moving resistance of the piston block and realizing the adaptive adjustment of the buffering effect of the buffer, so as to adapt to different buffering working conditions. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the overall structure provided by the embodiment of the present invention;

[0020] Figure 2 Partial cross-sectional view of the cylinder barrel provided by the embodiment of the present invention;

[0021] Figure 3 Partial cross-sectional view of the piston block provided by the embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the positional relationship between the extrusion rod and the disc provided by the embodiment of the present invention;

[0023] Figure 5 Top view of the positional relationship between the extrusion rod and the disc provided by the embodiment of the present invention;

[0024] Figure 6 Cross-sectional view of the disc provided by the embodiment of the present invention;

[0025] Figure 7 Cross-sectional view of the piston block provided by the embodiment of the present invention;

[0026] Figure 8 Schematic diagram of the positional relationship between the spring piece and the small hole provided by the embodiment of the present invention;

[0027] Figure 9 Schematic diagram of the installation state of the spring piece in the disc provided by the embodiment of the present invention.

[0028] Explanation of reference numerals:

[0029] 1. Cylinder barrel; 2. Piston block; 21. Oil flow hole; 22. Spring piece; 3. Piston rod; 31. Adjusting knob; 32. Perforation; 4. Disc; 41. Small hole; 42. Installation groove; 43. Rotating shaft; 44. Gear; 45. Arc groove; 46. First spring; 5. Transmission member; 51. Adjusting rod; 52. Rack; 53. Flap; 6. Adjusting member; 61. Extrusion rod; 611. Block; 62. Wedge block; 63. Second spring. Detailed implementation manners

[0030] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will further introduce the present invention in detail with reference to the drawings.

[0031] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] As Figures 1 - 9 shown, a hydraulic buffer provided by an embodiment of the present invention includes a cylinder barrel 1 and a piston block 2 installed in the cylinder barrel 1. A piston rod 3 is fixedly connected to the piston block 2 along its own axial direction. One end of the piston rod 3 far from the piston block 2 extends to the outside of the cylinder barrel 1. An oil flow hole 21 that communicates the spaces on both sides of the piston block 2 is formed on the piston block 2. A regulating assembly is further provided on the piston block 2, and the regulating assembly adjusts the effective aperture of the oil flow hole 21 according to the moving speed of the piston block 2.

[0033] Specifically, the cylinder barrel 1 is the main structure of the hydraulic buffer, and its overall shape is cylindrical. A cylindrical cavity is formed inside the cylinder barrel 1. The piston block 2 is arranged in the cavity and divides the cavity into two parts, and the piston block 2 can slide along the axial direction of the cylinder barrel 1. A piston rod 3 is fixedly connected to the piston block 2, and the piston rod 3 extends along the axial direction of the piston block 2 to the outside of the cylinder barrel 1. In addition, an oil flow hole 21 is formed on the piston block 2. For the convenience of description, the upper cavity is located above the piston block 2, and the lower cavity is located below the piston block 2; when the piston block 2 is at the uppermost part of the cylinder barrel 1, the volume of the upper cavity is zero, and the volume of the lower cavity is the largest; when the piston block 2 slides downward in the cylinder barrel 1, the volume of the upper cavity gradually increases, and the volume of the lower cavity gradually decreases. During this process, the oil in the lower cavity enters the upper cavity through the oil flow hole 21; different from the prior art, a regulating assembly is further provided on the piston block 2. The regulating assembly can adjust the effective aperture of the oil flow hole 21 according to the moving speed of the piston block 2. The greater the moving speed of the piston block 2, the smaller the regulating assembly adjusts the effective aperture of the oil flow hole 21, so as to increase the resistance of the oil passing through the oil flow hole 21, thereby improving the buffering effect of the buffer.

[0034] The hydraulic buffer provided by the embodiment of the present invention is provided with an adjusting component in the oil flow hole 21 that can adjust the effective aperture of the oil flow hole 21. When the piston block 2 moves faster in the cylinder barrel 1, the adjusting component will adjust the effective aperture of the oil flow hole 21 to be smaller, thereby increasing the moving resistance of the piston block 2 and realizing the adaptive adjustment of the buffering effect of the buffer, so as to adapt to different buffering working conditions.

[0035] Further, the adjusting component includes a spring piece 22 arranged on the piston block 2, and the spring piece 22 deforms under force to reduce the effective aperture of the oil flow hole 21.

[0036] Specifically, the adjusting component includes a spring piece 22. The spring piece 22 is arranged at a position corresponding to the oil flow hole 21 on the piston block 2 (such as the end face of the piston block 2 or inside the piston block 2. When arranged inside the piston block 2, the spring piece 22 cuts the oil flow hole 21 into two parts). The width of the spring piece 22 is smaller than the diameter of the oil flow hole 21, and one end of the spring piece 22 is fixedly connected to the piston block 2. With such a setting, a fan-shaped channel can be formed between both sides of the spring piece 22 and the plane where it is located. The oil liquid flows from one side of the oil flow hole 21 to the other side through this fan-shaped channel. When the spring piece 22 deforms under force, that is, gradually tends to be in a horizontal state, this fan-shaped channel will gradually become smaller, thereby reducing the effective aperture of the oil flow hole 21. Preferably, as Figure 6 、 Figure 8 and Figure 9 shown, the spring piece 22 includes an arc section and horizontal sections connected to both ends of the arc section. One of the horizontal sections is connected to the piston block 2, so as to ensure that the spring piece 22 will not shift relative to the oil flow hole 21 during the deformation process.

[0037] In another embodiment proposed by the present invention, a disc 4 is rotatably installed in the piston block 2. A small hole 41 is opened along the radial direction of the disc 4, and the small hole 41 is correspondingly opened with the oil flow hole 21. The spring piece 22 is arranged inside the disc 4, and a transmission member 5 for driving the disc 4 to rotate self - is arranged on the piston block 2. When the piston block 2 moves to the end of its stroke along the cylinder barrel 1, the transmission member 5 drives the disc 4 to rotate half a circle.

[0038] Specifically, in the above - mentioned embodiment, the spring piece 22 deforms to change the size of the above - mentioned fan - shaped channel to realize the adjustment of the effective aperture of the oil flow hole 21. Figure 6In the view, the spring piece 22 can deform under the impact of the oil fluid to reduce the cross-sectional area of the above-mentioned sector channel only when it moves upward following the piston block 2. This causes the spring piece 22 to be unable to adjust the effective aperture of the oil flow hole 21 through deformation during the downward movement of the piston block 2, that is, it cannot achieve two-way buffering and adaptively adjust the buffering effect. However, during the use of some machine tools or punching presses, a hydraulic buffer is required to have a two-way buffering function, that is, both when the piston block 2 moves upward or downward, it can be subjected to a large resistance. In this embodiment, a disk 4 is rotatably installed in the piston block 2. A small hole 41 is radially formed in the disk 4 along its own radial direction, and both ends of the small hole 41 penetrate through the side wall of the disk 4, as Figure 2 and Figure 3 shown, Figure 2 or Figure 3 In the disk 4 shown in, the rotation axis of the disk 4 is horizontally arranged, so that during the rotation of the disk 4, there is an angle that can make the small hole 41 and the oil flow hole 21 on the same axis. In addition, in this embodiment, the spring piece 22 is arranged in the small hole 41 on the disk 4. The spring piece 22 divides the small hole 41 into two sections. An installation groove 42 for installing the spring piece 22 is formed in the middle of the disk 4. The installation groove 42 is cross-shaped, as Figure 9 shown. The maximum dimension of the installation groove 42 along the length direction of the spring piece 22 is greater than the length of the spring piece 22, so as to reserve a certain space for the spring piece 22 to stretch during deformation (when the spring piece 22 gradually stretches, the height and cross-sectional area of the above-mentioned sector channel both become smaller). The maximum dimension of the installation groove 42 along the width direction of the spring piece 22 is greater than the width of the spring piece 22, so as to reserve enough clearance for the flow of the oil fluid. A transmission member 5 is also arranged on the piston block 2. The transmission member 5 is used to drive the disk 4 to rotate 180° at the end of the stroke of the piston block 2, that is, during the upward sliding of the piston block 2 along the cylinder barrel 1, when the piston block 2 approaches the top of the upper cavity in the cylinder barrel 1, the driving member starts to drive the disk 4 to rotate, or during the downward sliding of the piston block 2 along the cylinder barrel 1, when the piston block 2 approaches the bottom of the lower cavity in the cylinder barrel 1, the driving member starts to drive the disk 4 to rotate, so as to adjust the arching direction of the spring piece 22 (arching upward or downward above the piston block 2 in the Figure 2 or Figure 3 view).

[0039] In this embodiment, by arranging the transmission member 5 on the piston block 2 and driving the disk 4 to rotate at the end of the stroke of the piston block 2, the arching direction of the spring piece 22 is always consistent with the moving direction of the piston block 2, ensuring that when the piston block 2 moves upward or downward in the cylinder barrel 1, it can adaptively adjust the effective aperture of the small hole 41 according to its moving speed, thereby automatically adjusting the buffering effect of the buffer.

[0040] Further, the transmission member 5 includes an adjusting rod 51 slidably mounted on the piston block 2. The length of the adjusting rod 51 is greater than the axial dimension of the piston block 2. A rotating shaft 43 is coaxially provided on one side of the disk 4. The rotating shaft 43 extends toward the side where the adjusting rod 51 is located. And a gear 44 is fixedly connected to the end of the rotating shaft 43 away from the disk 4. The middle part of the adjusting rod 51 is a rack 52, and the rack 52 meshes with the gear 44.

[0041] Preferably, retaining plates 53 are fixedly connected to both ends of the adjusting rod 51, and grooves for accommodating the retaining plates 53 are formed on both end faces of the piston block 2.

[0042] Specifically, the adjusting rod 51 is a flat rod body, which penetrates along the axial direction of the piston block 2, and the length of the adjusting rod 51 is greater than the dimension of the piston block 2 along its own axial direction. In addition, the side surface of the disk 4 corresponding to the adjusting rod 51, that is, Figure 3 the left side surface of the disk 4 in the view is fixedly connected with a rotating shaft 43. The rotating shaft 43 is coaxially arranged with the disk 4, and the rotating shaft 43 extends toward the side where the adjusting rod 51 is located inside the piston block 2. A gear 44 is fixedly connected to the end of the rotating shaft 43 away from the disk 4. And the middle part of the adjusting rod 51 is a rack 52, and the rack 52 meshes with the gear 44. Within the moving stroke of the adjusting rod 51 along its own length direction, the rack 52 drives the gear 44 to rotate 180°, so that the disk 4 can rotate half a turn under the drive of the rotating shaft 43, thereby adjusting the arching direction of the spring piece 22; When the piston block 2 Figure 2 moves upward as shown in the cylinder barrel 1, the upper end of the adjusting rod 51 contacts the top wall of the upper cavity earlier than the piston block 2. As the piston block 2 continues to move upward, the upper end of the adjusting rod 51 is blocked and contracts toward the inside of the piston block 2, so that the rack 52 displaces relative to the gear 44 and drives the gear 44 to rotate. When the piston block 2 moves to contact the top wall of the upper cavity, the upper end of the adjusting rod 51 completely moves inside the piston block 2, and the lower end of the adjusting rod 51 extends outward from the lower side of the piston block 2; When the piston block 2 Figure 2During the downward movement of the cylinder barrel 1 shown, similarly, the lower end of the adjusting rod 51 contacts the bottom wall of the lower cavity before the piston block 2. As the piston block 2 continues to move downward, the lower end of the adjusting rod 51 is blocked and contracts into the interior of the piston block 2, causing the rack 52 to drive the gear 44 to rotate in the reverse direction. When the piston block 2 moves to contact the bottom wall of the lower cavity, the lower end of the adjusting rod 51 is completely moved into the interior of the piston block 2, and the upper end of the adjusting rod 51 extends outward from above the piston block 2. With such a setting, by using the movement of the piston block 2 within the cylinder barrel 1, the transmission member 5 is driven to passively rotate the disc 4 by 180°, and the arching direction of the spring piece 22 is timely adjusted at the end of the stroke of the piston block 2, enabling the buffer to perform two-way buffering (having a buffering effect in both moving directions of the piston block 2). To prevent the adjusting rod 51 from detaching from the piston block 2, in a specific implementation, both ends of the adjusting rod 51 are fixedly connected with retaining plates 53, and grooves are provided at the corresponding positions of the two end faces of the piston block 2 for the retaining plates 53. The grooves cooperate with the retaining plates 53 to prevent the adjusting rod 51 from detaching from the piston block 2 on the premise of not affecting the complete movement of the upper end or the lower end of the adjusting rod 51 into the interior of the piston block 2.

[0043] In yet another embodiment proposed by the present invention, two sets of arc-shaped grooves 45 are provided on the side wall of the disc 4 along its circumferential direction, and the two arc-shaped grooves 45 are respectively communicated with both ends of the small hole 41.

[0044] Specifically, in the above embodiment, through the relative movement between the adjusting rod 51 and the piston block 2, the rack 52 drives the gear 44 to rotate. This requires the adjusting rod 51 to have a sufficient relative displacement with the piston block 2 to drive the gear 44 to rotate 180°. At the initial stage of the rotation of the disc 4, once the end of the small hole 41 is completely staggered from the oil flow hole 21, the side wall of the disc 4 will block the oil flow hole 21, resulting in the inability of the oil to flow from the upper cavity to the lower cavity (or from the lower cavity to the upper cavity) through the piston block 2. The piston block 2 needs to continue to move and can only squeeze the oil in the upper cavity or the lower cavity, and the hydraulic oil is almost incompressible. This leads to the situation in the above embodiment that after the disc 4 rotates until the end of the small hole 41 is completely staggered from the oil flow hole 21, the piston block 2 is blocked by the oil in the upper cavity (lower cavity) and cannot continue to move, and the adjusting rod 51 cannot continue to have a relative displacement with the piston block 2. In this embodiment, two sets of arc-shaped grooves 45 are provided on the side wall of the disc 4 along its axial direction, as Figure 4 and Figure 7As shown, the two groups of arc grooves 45 are connected to the two ends of the small hole 41 respectively. With such arrangement, in the early stage of the rotation of the disc 4, when the small hole 41 is offset from the oil flow hole 21, the arc groove 45 can continue to guide the oil to one end of the corresponding small hole 41, thereby ensuring that the oil can still pass through the piston block 2 and flow from the upper cavity to the lower cavity (or from the lower cavity to the upper cavity); preferably, the central angle of the arc groove 45 is between 160° and 180°, thereby shortening the time when the oil flow hole 21 is blocked as much as possible; with such arrangement, in the oil flow hole 21 During the blocked time, although the remaining oil in the upper cavity (lower cavity) cannot be compressed, the deformation of the sealing ring between the piston block 2 and the cylinder 1 can provide a certain space to accommodate the remaining oil, so that the piston block 2 continues to move a small distance, ensuring that the disc 4 can rotate 180°, thereby adjusting the arching direction of the spring sheet 22; if the central angle of the arc groove 45 is large enough, that is, the arc groove 45 is connected to only one end of the small hole 41, and its arc length is as close as possible to half of the circumference of the disc 4, then the following will occur Figure 7 In the state shown, that is, within the 180° rotation stroke of the disc 4, the oil flow hole 21 will not be completely blocked by the disc 4, but when the disc 4 rotates close to 180°, the oil flow hole 21 can be connected with one end of the small hole 41, and can also be connected with the arc groove 45 connected to the other end of the small hole 41, and the oil can always flow from the upper cavity to the lower cavity (or from the lower cavity to the upper cavity), thereby ensuring that the piston block 2 can continue to move to contact the top wall of the upper cavity or the bottom wall of the lower cavity, so that the upper end or the lower end of the adjusting rod 51 is completely retracted into the interior of the piston block 2.

[0045] In another embodiment of the present invention, the rotating shaft 43 is slidably mounted on the disc 4, and a first spring 46 is provided on the disc 4 for maintaining the rotating shaft 43 coaxial with the disc 4. An adjusting member 6 is also provided on the piston block 2, and the adjusting member 6 drives the rotating shaft 43 to slide so that the gear 44 moves away from the adjusting rod 51.

[0046] Specifically, in the above embodiment, the arching direction of the spring sheet 22 is changed by the rotation of the disc 4, so that the buffer can perform bidirectional buffering. However, during the use of machinery such as machine tools, some buffering conditions require unidirectional buffering. For example, the upward movement of the piston block 2 requires buffering, but the downward movement does not require buffering. At this time, it is necessary to disassemble the adjusting rod 51 to disconnect the drive to the disc 4, so that the spring sheet 22 always arches in one direction (upward or downward), and the operation is relatively cumbersome. In this embodiment, the rotating shaft 43 is slidably mounted on the disc 4, such as Figure 4As shown, a square slider is slidably mounted on the disc 4, and the rotating shaft 43 is fixedly connected to the square slider, thus realizing the sliding connection between the rotating shaft 43 and the disc 4. The sliding direction of the rotating shaft 43 is perpendicular to the surface of the adjusting rod 51 corresponding to the gear 44. In addition, an adjusting member 6 for driving the rotating shaft 43 to slide is provided on the piston block 2. When the rotating shaft 43 is driven to slide, the gear 44 can be driven by the rotating shaft 43 to move away from the adjusting rod 51, that is, the transmission relationship between the adjusting rod 51 and the disc 4 is disconnected; in order to ensure that the rotating shaft 43 can coincide with the central axis of the disc 4 when not driven, so as to ensure that the rotation of the rotating shaft 43 can smoothly drive the disc 4 to rotate, a second spring 63 is installed on the disc 4, as Figure 4 shown, a guiding groove for guiding the rotating shaft 43 is formed on the disc 4, and the second spring 63 is arranged in the guiding groove. When the second spring 63 is in a natural state, the central axes of the rotating shaft 43 and the disc 4 coincide.

[0047] Optionally, the adjusting member 6 includes a pressing rod 61 slidably mounted on the piston block 2, and a wedge block 62 for driving the rotating shaft 43 to slide is arranged at one end of the pressing rod 61; as Figure 4 shown, one end of the pressing rod 61 extends to the side of the rotating shaft 43 corresponding to the adjusting rod 51, and a wedge block 62 is fixedly connected to the end of the pressing rod 61. The bevel angle of the wedge block 62 corresponds to that of the rotating shaft 43. When the pressing rod 61 is driven to slide in the piston block 2, the bevel angle of the wedge block 62 pushes the rotating shaft 43 away from the adjusting rod 51; in specific implementation, the piston block 2 is moved to the upper end or the lower end of the cylinder barrel 1 to adjust the arching direction of the spring piece 22 (arching upward or downward), and then the pressing rod 61 is moved to drive the rotating shaft 43 away from the adjusting rod 51, so as to disconnect the transmission relationship between the adjusting rod 51 and the disc 4, making the buffer only capable of one-way buffering.

[0048] Furthermore, there are two piston rods 3, and the two piston rods 3 are respectively connected to the two end faces of the piston block 2. One of the piston rods 3 is of a hollow structure, and an adjusting knob 31 is threadedly connected to the hollow piston rod 3. The pressing rod 61 extends into the piston rod 3 and abuts against the adjusting knob 31. A second spring 63 for maintaining the relative position between the pressing rod 61 and the piston rod 3 is arranged in the piston rod 3.

[0049] Specifically, in the above embodiment, since the internal space of the cylinder barrel 1 is airtight, when it is necessary to adjust the buffering mode of the buffer (adjust between one-way buffering and two-way buffering), it is necessary to drain the oil in the cylinder barrel 1 and then disassemble one end of the cylinder barrel 1 to expose the piston block 2, so as to facilitate adjusting the position of the pressing rod 61, and the operation is relatively inconvenient; in this embodiment, there are two piston rods 3 on the piston block 2, as Figure 2As shown in the figure, two sets of piston rods 3 are respectively fixed to two end faces of the piston block 2, and the two piston rods 3 respectively extend outward from both ends of the cylinder barrel 1. One of the piston rods 3 has a hollow structure. For the convenience of description, the piston rod 3 with a solid structure is the first rod, and the piston rod 3 with a hollow structure is the second rod. An adjusting knob 31 is threadedly connected to the second rod. One end of the extrusion rod 61 away from the wedge block 62 is bent and extends into the second rod, and one end of the extrusion rod 61 inside the second rod abuts against the adjusting knob 31. In this way, the extrusion rod 61 can be driven to slide relative to the piston block 2 by the adjusting knob 31, so as to cut off the transmission relationship between the adjusting rod 51 and the disc 4. In addition, a second spring 63 is arranged inside the second rod. The second spring 63 is sleeved outside the part of the extrusion rod 61 inside the second rod. A stop block 611 is sleeved on the part of the extrusion rod 61 inside the second rod. Two ends of the second spring 63 respectively contact the stop block 611 and the end face of the piston block 2. When the second spring 63 is in a natural state, the wedge block 62 does not contact the rotating shaft 43, that is, the transmission relationship between the adjusting rod 51 and the disc 4 is in an established state at this time.

[0050] During specific implementation, the extrusion rod 61 is divided into three sequentially connected segments. Taking Figure 2 the vertical direction in the view as the Y-axis of the three-dimensional coordinate system and the horizontal direction as the X-axis as an example, the three segments of the extrusion rod 61 are respectively arranged along the Y-axis, the X-axis, and the Z-axis. The above-mentioned wedge block 62 is fixedly connected to one end of the extrusion rod 61 arranged along the Z-axis. In this way, the extrusion rod 61 can bypass the disc 4 and the oil flow hole 21, avoiding the interference of the arrangement of the extrusion rod 61 with the rotation of the disc 4.

[0051] Furthermore, one end of the hollow piston rod 3 corresponding to the piston block 2 is provided with a through hole 32, and the through hole 32 connects the internal and external spaces of the piston rod 3.

[0052] Specifically, heat will be generated during the use of the buffer, especially in the working conditions with a high buffering frequency. High temperature will cause the hydraulic oil to age and deteriorate, thereby reducing the working efficiency and stability of the buffer. Therefore, it is necessary to regularly replace the hydraulic oil; for the convenience of replacing the oil in the cylinder barrel 1; in this embodiment, a through hole 32 is opened at one end of the second rod connected to the piston block 2. The through hole 32 connects the internal space of the second rod with the above-mentioned upper cavity. And the adjusting knob 31 only abuts against one end of the extrusion rod 61 inside the second rod. Therefore, the adjusting knob 31 can be directly disassembled, and the oil in the upper cavity and the lower cavity can be discharged and replaced through the second rod, and the operation is relatively simple.

[0053] Only some exemplary embodiments of the present invention have been described by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A hydraulic buffer, comprising a cylinder and a piston block installed in the cylinder, a piston rod is fixedly connected to the piston block along its own axial direction, one end of the piston rod away from the piston block extends to the outside of the cylinder, and an oil flow hole is opened on the piston block to connect the spaces on both sides of the piston block, characterized in that: The piston block is also provided with an adjusting component, which adjusts the effective aperture of the oil flow hole according to the moving speed of the piston block. The adjusting component includes a spring sheet arranged on the piston block. The spring sheet is deformed under force to reduce the effective aperture of the oil flow hole. The spring sheet includes an arc segment and a horizontal segment connected to both ends of the arc segment. One of the horizontal segments is connected to the piston block. A disc is rotatably installed in the piston block. Small holes are opened on the disc along its own radial direction. The small holes are opened corresponding to the oil flow hole. The spring sheet is arranged in the disc. A transmission member for driving the disc to rotate is arranged on the piston block. When the piston block moves along the cylinder to the end of its stroke, the transmission member drives the disc to rotate half a circle. The transmission member includes an adjusting rod slidably installed on the piston block. The length of the adjusting rod is greater than the axial size of the piston block. A rotating shaft is coaxially arranged on one side of the disc, and the rotating shaft extends to the side where the adjusting rod is located, and a gear is fixedly connected to the end of the rotating shaft away from the disc. The middle part of the adjusting rod is a rack, and the rack is meshed with the gear.

2. A hydraulic buffer according to claim 1, characterized in that: Both ends of the regulating rod are fixedly connected with blocking pieces, and both end surfaces of the piston block are provided with grooves for accommodating the blocking pieces.

3. A hydraulic buffer according to claim 1, characterized in that: The side wall of the disc is provided with two groups of arc grooves along its circumference, and the two arc grooves are respectively connected with the two ends of the small hole.

4. A hydraulic buffer according to claim 1, characterized in that: The rotating shaft is slidably mounted on the disc, a first spring for maintaining the rotating shaft and the disc coaxial is arranged on the disc, and an adjusting member is also arranged on the piston block, the adjusting member drives the rotating shaft to slide so that the gear is away from the adjusting rod.

5. A hydraulic buffer according to claim 4, characterized in that: The adjusting member comprises an extrusion rod which is slidably mounted on the piston block, and one end of the extrusion rod is provided with a wedge block for driving the rotating shaft to slide.

6. A hydraulic buffer according to claim 5, characterized in that: Two groups of piston rods are provided, and the two piston rods are respectively connected to the two end surfaces of the piston block. One of the piston rods is a hollow structure, and an adjusting knob is threadedly connected to the hollow piston rod. The extrusion rod extends into the piston rod and abuts against the adjusting knob. A second spring is provided in the piston rod for maintaining the relative position of the extrusion rod and the piston rod.

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