Hydraulic buffer

Abstract

The hydraulic buffer belongs to the technical field of buffer devices and comprises a cylinder barrel and a piston block installed in the cylinder barrel, a piston rod is fixedly connected to the piston block in the axial direction of the piston block, the end, away from the piston block, of the piston rod extends to the outer portion of the cylinder barrel, and an oil flowing hole communicating spaces on the two sides of the piston block is formed in the piston block. The piston block is further provided with an adjusting assembly, and the adjusting assembly adjusts the effective hole diameter of the oil flowing hole according to the moving speed of the piston block. According to the hydraulic buffer provided by the invention, the adjusting assembly capable of adjusting the effective hole diameter of the oil flowing hole is arranged in the oil flowing hole, and when the moving speed of the piston block in the cylinder barrel is higher, the adjusting assembly adjusts the effective hole diameter of the oil flowing hole to be smaller, so that the moving resistance of the piston block is increased, and the self-adaptive adjustment of the buffer effect of the buffer is realized; and therefore, different buffering working conditions can be adapted.

Description

Technical Field

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

[0002] Hydraulic buffers can effectively reduce or eliminate the impact and vibration of mechanical equipment during movement, and protect the equipment and workpieces from damage. In the field of mechanical equipment, hydraulic buffers are usually used on high-speed moving parts, such as machine tools, CNC equipment, punching machines, etc. Common hydraulic buffers mainly include a cylinder assembly and a piston assembly. The cylinder assembly is filled with hydraulic oil, and an oil flow hole is opened on the piston to connect the spaces on both sides of the piston. When the piston moves, the oil on one side of the piston is squeezed through the oil flow hole to the other side of the piston, thereby generating hydraulic damping to absorb kinetic energy, thereby achieving the purpose of buffering.

[0003] For example, the patent with announcement number CN108006141B, announcement date 2020-07-14, discloses a hydraulic buffer, belonging to the field of buffers, the hydraulic buffer comprises: a cylinder, a first end cover, a second end cover, a damping mandrel, an adjustment sleeve, a piston rod, a damping ring and a piston, the first end cover and the second end cover are respectively mounted on the two end faces of the cylinder, the first end cover, the cylinder and the second end cover constitute a chamber for accommodating a fluid medium, the second end cover is provided with an accumulator interface connected to the chamber, the damping mandrel comprises a driving mounting section and a damping section, the first end of the driving mounting section extends out of the first end cover, the second end of the driving mounting section is connected to the first end of the damping section, and the damping section is arranged in the chamber. The hydraulic buffer rotates the damping mandrel, and selects damping grooves of different cross-sections to be aligned with the adjustment through hole according to the buffering conditions of different gears required by the load, thereby generating different damping forces, thereby enabling the hydraulic buffer to adjust its buffering capacity according to the load.

[0004] In the existing hydraulic buffer, since the diameter of the oil flow port opened on the piston is fixed, the damping value generated by the piston squeezing the oil is fixed, resulting in the hydraulic buffer being applicable only to a certain buffering condition and having a poor buffering effect. Summary of the invention

[0005] An object of the present invention is to provide a hydraulic buffer.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A hydraulic buffer comprises a cylinder and a piston block installed in the cylinder, a piston rod is fixedly connected to the piston block along its axial direction, one end of the piston rod away from the piston block extends to the outside of the cylinder, an oil flow hole is opened on the piston block to connect the spaces on both sides of the piston block, and an adjustment component is also provided on the piston block, which adjusts the effective aperture of the oil flow hole according to the moving speed of the piston block.

[0007] The hydraulic buffer, the adjusting assembly comprises a spring sheet arranged on the piston block, the spring sheet is deformed by force to reduce the effective aperture of the oil flow hole.

[0008] In the hydraulic buffer, the spring sheet comprises an arc segment and horizontal segments connected to both ends of the arc segment, and the horizontal segment is connected to the piston block.

[0009] The above-mentioned hydraulic buffer has a disc rotatably installed in the piston block, and small holes are opened on the disc along its own radial direction, and the small holes are opened corresponding to the oil flow holes. A spring sheet is arranged in the disc, and 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.

[0010] The above-mentioned hydraulic buffer, the transmission part includes an adjusting rod slidably mounted 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 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.

[0011] In the hydraulic buffer, both ends of the adjusting rod are fixedly connected with baffles, and both end surfaces of the piston block are provided with grooves for accommodating the baffles.

[0012] The hydraulic buffer has two groups of arc grooves on the side wall of the disc along its circumference, and the two arc grooves are respectively connected to the two ends of the small hole.

[0013] The hydraulic buffer has a rotating shaft slidably mounted on a 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, which drives the rotating shaft to slide so that the gear is away from the adjusting rod.

[0014] The hydraulic buffer, the adjusting member comprises an extrusion rod slidably mounted on the piston block, one end of the extrusion rod is provided with a wedge block for driving the rotating shaft to slide.

[0015] The above-mentioned hydraulic buffer has two groups of piston rods, 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.

[0016] In the above technical scheme, the hydraulic buffer provided by the present invention, by arranging an adjusting component in the oil flow hole that can adjust the effective aperture of the oil flow hole, when the piston block moves faster in the cylinder, the adjusting component adjusts the effective aperture of the oil flow hole to be smaller, thereby increasing the movement resistance of the piston block, thereby realizing adaptive adjustment of the buffer's buffering effect, so as to adapt to different buffering conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A partial cross-sectional view of a cylinder provided in an embodiment of the present invention; Figure 3 A partial cross-sectional view of a piston block provided in an embodiment of the present invention; Figure 4 A schematic diagram of the position relationship between the extrusion rod and the disc provided in an embodiment of the present invention; Figure 5 A top view of the position relationship between the extrusion rod and the disc provided in an embodiment of the present invention; Figure 6 A cross-sectional view of a disk provided for an embodiment of the present invention; Figure 7 A cross-sectional view of a piston block provided in an embodiment of the present invention; Figure 8 A schematic diagram of the positional relationship between the spring sheet and the small hole provided in an embodiment of the present invention; Fig. 9 A schematic diagram of the installation state of a spring sheet provided in an embodiment of the present invention in a disc.

[0019] Description of reference numerals: 1. Cylinder barrel; 2. Piston block; 21. Oil flow hole; 22. Spring sheet; 3. Piston rod; 31. Adjustment knob; 32. Perforation; 4. Disc; 41. Small hole; 42. Mounting groove; 43. Rotating shaft; 44. Gear; 45. Arc groove; 46. First spring; 5. Transmission member; 51. Adjustment rod; 52. Rack; 53. Baffle; 6. Adjustment member; 61. Extrusion rod; 611. Baffle; 62. Wedge; 63. Second spring. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] In the description of the present invention, unless otherwise specified, "multiple" means two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" 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.

[0022] like Figure 1-Figure 9 As shown, a hydraulic buffer provided by an embodiment of the present invention comprises a cylinder 1 and a piston block 2 installed in the cylinder 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 away from the piston block 2 extends to the outside of the cylinder 1, an oil flow hole 21 for connecting the spaces on both sides of the piston block 2 is opened on the piston block 2, and an adjusting component is also provided on the piston block 2, which adjusts the effective aperture of the oil flow hole 21 according to the moving speed of the piston block 2.

[0023] Specifically, the cylinder 1 is the main structure of the hydraulic buffer, which is cylindrical as a whole. A cylindrical cavity is opened inside the cylinder 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 1. A piston rod 3 is fixed to the piston block 2, and the piston rod 3 extends to the outside of the cylinder 1 along the axial direction of the piston block 2. In addition, an oil flow hole 21 is opened 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 1, the volume of the upper cavity is zero, and the volume of the lower cavity is zero. The volume of the upper cavity is the largest; and when the piston block 2 slides downward in the cylinder 1, the volume of the upper cavity gradually increases, while 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, an adjusting component is also provided on the piston block 2, and the adjusting component 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 effective aperture of the oil flow hole 21 is adjusted by the adjusting component, thereby increasing the resistance of the oil through the oil flow hole 21, thereby improving the buffering effect of the buffer.

[0024] The hydraulic buffer provided in the embodiment of the present invention has 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 1, the adjusting component adjusts the effective aperture of the oil flow hole 21 to be smaller, thereby increasing the movement resistance of the piston block 2, thereby realizing adaptive adjustment of the buffer's buffering effect to adapt to different buffering conditions.

[0025] Furthermore, the adjustment assembly includes a spring sheet 22 disposed on the piston block 2 , and the spring sheet 22 is deformed by force to reduce the effective aperture of the oil flow hole 21 .

[0026] Specifically, the adjustment component includes a spring sheet 22, which is arranged at a position on the piston block 2 corresponding to the oil flow hole 21 (such as the end surface of the piston block 2 or the inside of the piston block 2. When arranged inside the piston block 2, the spring sheet 22 cuts the oil flow hole 21 into two parts). The width of the spring sheet 22 is smaller than the diameter of the oil flow hole 21, and one end of the spring sheet 22 is fixedly connected to the piston block 2. In this way, both sides of the spring sheet 22 can form a fan-shaped channel with the plane where it is located, and the oil flows from one side of the oil flow hole 21 to the other side through the fan-shaped channel. When the spring sheet 22 is deformed by force, that is, gradually tends to a horizontal state, the 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 Fig. 9 As shown, the spring sheet 22 includes an arc segment and horizontal segments connected to both ends of the arc segment, and the horizontal segment is connected to the piston block 2, thereby ensuring that the spring sheet 22 will not deviate relative to the oil flow hole 21 during the deformation process.

[0027] In another embodiment of the present invention, a disc 4 is rotatably installed in the piston block 2, and a small hole 41 is opened on the disc 4 along its own radial direction. The small hole 41 is opened corresponding to the oil flow hole 21. A spring sheet 22 is arranged in the disc 4, and a transmission member 5 for driving the disc 4 to rotate is arranged on the piston block 2. When the piston block 2 moves along the cylinder 1 to the end of its stroke, the transmission member 5 drives the disc 4 to rotate half a circle.

[0028] Specifically, in the above embodiment, the spring sheet 22 is deformed to change the size of the fan-shaped channel to adjust the effective aperture of the convection oil hole 21. Figure 6In the view, the spring sheet 22 can only be deformed under the impact of the oil to reduce the cross-sectional area of ​​the above-mentioned fan-shaped channel when it moves upward with the piston block 2. This results in that when the piston block 2 moves downward, the spring sheet 22 cannot adjust the effective aperture of the oil flow hole 21 by deformation, that is, it is impossible to achieve two-way buffering and adaptively adjust the buffering effect. However, in the use of some machine tools or punching machines, the hydraulic buffer is required to have a two-way buffering function, that is, the piston block 2 can be subjected to greater resistance when moving up or down; in this embodiment, a disc 4 is rotatably installed in the piston block 2, and a small hole 41 is opened on the disc 4 along its own radial direction, and both ends of the small hole 41 are connected to the side wall of the disc 4, such as Figure 2 and Figure 3 As shown, Figure 2 or Figure 3 The rotation axis of the middle disk 4 is arranged horizontally, so that during the rotation of the disk 4, there is an angle that enables the small hole 41 and the oil flow hole 21 to be on the same axis. In addition, in this embodiment, the spring sheet 22 is arranged in the small hole 41 on the disk 4, and the spring sheet 22 divides the small hole 41 into two sections. The middle part of the disk 4 is provided with a mounting groove 42 for mounting the spring sheet 22, and the mounting groove 42 is cross-shaped, such as Fig. 9 As shown, the maximum dimension of the mounting groove 42 along the length direction of the spring sheet 22 is greater than the length of the spring sheet 22, so as to reserve a certain space for the extension of the spring sheet 22 when it is deformed (when the spring sheet 22 gradually extends, the height and cross-sectional area of ​​the above-mentioned fan-shaped channel are reduced), and the maximum dimension of the mounting groove 42 along the width direction of the spring sheet 22 is greater than the width of the spring sheet 22, so as to reserve a sufficient gap for the flow of oil; a transmission member 5 is also provided on the piston block 2, and the transmission member 5 is used to drive the disc 4 to rotate 180° at the end of the stroke of the piston block 2, that is, in the process of the piston block 2 sliding upward 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 disc 4 to rotate, or in the process of the piston block 2 sliding downward 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 disc 4 to rotate, thereby adjusting the direction of the spring sheet 2 arching (towards Figure 2 or Figure 3 The piston block 2 is arched upward or downward in the view).

[0029] In this embodiment, a transmission member 5 is provided on the piston block 2, and at the end of the stroke of the piston block 2, the transmission member 5 drives the disc 4 to rotate, so that the arching direction of the spring sheet 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 1, the effective aperture of the small hole 41 can be adaptively adjusted according to its moving speed, thereby automatically adjusting the buffering effect of the buffer.

[0030] Furthermore, 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 arranged on one side of the disc 4, the rotating shaft 43 extends to the side where the adjusting rod 51 is located, and a gear 44 is fixedly connected to one end of the rotating shaft 43 away from the disc 4, the middle part of the adjusting rod 51 is a rack 52, and the rack 52 is meshed with the gear 44.

[0031] Preferably, blocking pieces 53 are fixedly connected to both ends of the adjusting rod 51 , and grooves for accommodating the blocking pieces 53 are formed on both end surfaces of the piston block 2 .

[0032] Specifically, the adjusting rod 51 is a flat rod body, which is arranged to penetrate the piston block 2 along the axial direction, and the length of the adjusting rod 51 is greater than the axial dimension of the piston block 2. In addition, the side of the disc 4 corresponding to the adjusting rod 51 is also Figure 3 The left side of the disc 4 in the view is fixedly connected with a rotating shaft 43, which is coaxially arranged with the disc 4 and extends to the side where the adjusting rod 51 is located in the piston block 2. The end of the rotating shaft 43 away from the disc 4 is fixedly connected with a gear 44, and the middle part of the adjusting rod 51 is a rack 52, which meshes with the gear 44. Within the stroke of the adjusting rod 51 moving along its own length direction, the rack 52 drives the gear 44 to rotate 180°, so that the disc 4 can rotate half a circle driven by the rotating shaft 43, thereby adjusting the direction of the spring sheet 22 arching; when the piston block 2 moves along the length direction of the adjusting rod 51, the rotating shaft 43 is rotated to adjust ... Figure 2 During the upward movement of the cylinder 1 shown in the figure, the upper end of the adjusting rod 51 contacts the top wall of the upper cavity before the piston block 2. As the piston block 2 continues to move upward, the upper end of the adjusting rod 51 is blocked and retracts toward the inside of the piston block 2, so that the rack 52 is displaced 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 into the inside of the piston block 2, and the lower end of the adjusting rod 51 extends outward from the bottom of the piston block 2. Figure 2In the process of the cylinder 1 moving downward, 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 shrinks toward the inside of the piston block 2, so that the rack 52 drives the gear 44 to rotate in the opposite direction. When the piston block 2 moves to contact the bottom wall of the lower cavity, the lower end of the adjusting rod 51 completely moves into the inside of the piston block 2, and the upper end of the adjusting rod 51 extends outward from the top of the piston block 2. In this way, the movement of the piston block 2 in the cylinder 1 is utilized to enable the transmission member 5 to passively drive the transmission member 5. The disc 4 rotates 180° and timely adjusts the arching direction of the spring sheet 22 at the end of the stroke of the piston block 2, so that the buffer can perform bidirectional buffering (it has a buffering effect in both moving directions of the piston block 2); in order to prevent the adjusting rod 51 from detaching from the piston block 2, in the specific implementation, both ends of the adjusting rod 51 are fixedly connected with a baffle 53, and grooves are provided at the positions of the baffle 53 at both end surfaces of the piston block 2. The grooves cooperate with the baffle 53 to prevent the adjusting rod 51 from detaching from the piston block 2 without affecting the upper or lower end of the adjusting rod 51 from completely moving into the interior of the piston block 2.

[0033] In another embodiment of the present invention, two groups of arc grooves 45 are formed on the side wall of the disk 4 along its circumference, and the two arc grooves 45 are respectively connected to the two ends of the small hole 41.

[0034] Specifically, in the above embodiment, the rack 52 drives the gear 44 to rotate through the relative movement of the adjusting rod 51 and the piston block 2, which results in the adjusting rod 51 having to generate a sufficiently large relative displacement with the piston block 2 to drive the gear 44 to rotate 180°. In the early stage of the rotation of the disc 4, once the end of the small hole 41 is completely offset from the oil flow hole 21, the side wall of the disc 4 will block the oil flow hole 21, thereby preventing the oil from flowing from the upper cavity to the lower cavity (or from the lower 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 can hardly be compressed. This results in that in the above embodiment, after the disc 4 rotates until the end of the small hole 41 is completely offset from the oil flow hole 21, the piston block 2 cannot continue to move due to the obstruction of the oil in the upper cavity (lower cavity), and the adjusting rod 51 cannot continue to move relative to the piston block 2. In this embodiment, the side wall of the disc 4 is provided with two sets of arc grooves 45 along its own axial direction, such 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.

[0035] 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.

[0036] 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, the disc 4 is slidably mounted with a square slider, and the rotating shaft 43 is fixedly connected to the square slider, so that the sliding connection between the rotating shaft 43 and the disc 4 is realized, and the sliding direction of the rotating shaft 43 is perpendicular to the surface of the side of the adjusting rod 51 corresponding to the gear 44. In addition, the piston block 2 is also provided with an adjusting member 6 for driving the rotating shaft 43 to slide. When the rotating shaft 43 is driven to slide, the gear 44 can be driven away from the adjusting rod 51 by the rotating shaft 43, that is, the transmission relationship between the adjusting rod 51 and the disc 4 is disconnected; in order to make the rotating shaft 43 coincide with the central axis of the disc 4 when it is 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 shown in FIG. Figure 4 As shown, a guide groove for guiding the rotating shaft 43 is provided on the disc 4, and the second spring 63 is arranged in the guide groove. When the second spring 63 is in a natural state, the central axes of the rotating shaft 43 and the disc 4 coincide with each other.

[0037] Optionally, the adjusting member 6 includes an extrusion rod 61 slidably mounted on the piston block 2, and one end of the extrusion rod 61 is provided with a wedge block 62 for driving the rotating shaft 43 to slide; Figure 4 As shown, one end of the extrusion rod 61 extends to a 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 extrusion rod 61, and the bevel angle of the wedge block 62 corresponds to the rotating shaft 43. When the extrusion 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 1 to adjust the arch direction of the spring sheet 22 (upward arch or downward arch), and then the extrusion rod 61 is moved to drive the rotating shaft 43 away from the adjusting rod 51, thereby disconnecting the transmission relationship between the adjusting rod 51 and the disc 4, so that the buffer can only buffer in one direction.

[0038] Furthermore, two groups of piston rods 3 are provided, and the two piston rods 3 are respectively connected to the two end surfaces of the piston block 2. One of the piston rods 3 is a hollow structure, and an adjusting knob 31 is threadedly connected to the hollow piston rod 3. The extrusion rod 61 extends into the piston rod 3 and abuts against the adjusting knob 31. A second spring 63 is provided in the piston rod 3 for maintaining the relative position of the extrusion rod 61 and the piston rod 3.

[0039] Specifically, in the above embodiment, since the internal space of the cylinder 1 is closed, when the buffering mode of the buffer needs to be adjusted (adjusted between one-way buffering and two-way buffering), it is necessary to discharge the oil in the cylinder 1 and then disassemble one end of the cylinder 1 to expose the piston block 2 so as to adjust the position of the extrusion rod 61, which is inconvenient to operate. In this embodiment, the piston rod 3 on the piston block 2 is provided with two groups, such as Figure 2As shown, two groups of piston rods 3 are respectively fixed on the two end surfaces of the piston block 2, and the two piston rods 3 are respectively extended outward from the two ends of the cylinder 1, and the piston rod 3 is a hollow structure. For the convenience of description, the piston rod 3 of the solid structure is the first rod, and the piston rod 3 of the hollow structure is the second rod. The second rod is threadedly connected with an adjusting knob 31, and the end of the extrusion rod 61 away from the wedge block 62 is bent and extended to the inside of the second rod, and the end of the extrusion rod 61 in the second rod is in contact with the adjusting knob 31, so that the extrusion rod 61 can be driven relative to the adjusting knob 31. The piston block 2 slides, thereby cutting off the transmission relationship between the adjusting rod 51 and the disc 4. In addition, a second spring 63 is arranged in the second rod, and the second spring 63 is sleeved on the outside of the part of the extrusion rod 61 in the second rod. The part of the extrusion rod 61 in the second rod is sleeved with a stopper 611, and the two ends of the second spring 63 are in contact with the stopper 611 and the end face of the piston block 2 respectively. When the second spring 63 is in a natural state, the wedge block 62 is not in contact with the rotating shaft 43, that is, at this time, the transmission relationship between the adjusting rod 51 and the disc 4 is in an established state.

[0040] In specific implementation, the extrusion rod 61 is divided into three sections connected in sequence. Figure 2 Taking 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 sections of the extrusion rod 61 are respectively arranged along the Y-axis, the X-axis and the Z-axis, and the wedge block 62 is fixedly connected to one end of the extrusion rod 61 arranged along the Z-axis, so that the extrusion rod 61 can bypass the disc 4 and the oil flow hole 21, avoiding the setting of the extrusion rod 61 from interfering with the rotation of the disc 4.

[0041] Furthermore, a through hole 32 is formed at one end of the hollow piston rod 3 corresponding to the piston block 2 , and the through hole 32 connects the inner and outer spaces of the piston rod 3 .

[0042] Specifically, heat is generated during the use of the buffer, especially under conditions with high buffering frequency, and high temperature will cause the hydraulic oil to age and deteriorate, thereby reducing the working efficiency and stability of the buffer, and therefore the hydraulic oil needs to be replaced regularly; to facilitate the replacement of the oil in the cylinder 1; in this embodiment, a through hole 32 is provided at one end of the second rod connected to the piston block 2, and 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 in the second rod, so the adjusting knob 31 can be directly removed, 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.

[0043] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions 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: An adjustment component is also provided on the piston block, which adjusts the effective aperture of the oil flow hole according to the movement speed of the piston block. The adjustment component includes a spring sheet arranged on the piston block, and 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, and the horizontal segment is connected to the piston block.

2. A hydraulic buffer according to claim 1, characterized in that: A disc is rotatably installed in the piston block. Small holes are opened on the disc along its radial direction. The small holes are opened corresponding to the oil flow holes. A spring sheet is arranged in the disc. A transmission part 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 part drives the disc to rotate half a circle.

3. A hydraulic buffer according to claim 2, characterized in that: The transmission part includes an adjusting rod slidably mounted 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 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.

4. A hydraulic buffer according to claim 3, 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.

5. A hydraulic buffer according to claim 2 or 3, 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.

6. A hydraulic buffer according to claim 3, 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.

7. A hydraulic buffer according to claim 6, 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.

8. A hydraulic buffer according to claim 7, 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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