Hydraulic oil cylinder based on vibration reduction of piston rod

Abstract

The invention discloses a hydraulic oil cylinder based on vibration reduction of a piston rod, and particularly relates to the technical field of oil cylinders, the hydraulic oil cylinder comprises a hydraulic oil cylinder body installed on an external machine tool through a fixing plate, the fixing plate is provided with an installation hole for the piston rod of the hydraulic oil cylinder body to freely pass through, and the hydraulic oil cylinder further comprises a buffer seat, the piston rod freely slides on the buffer seat; the connecting shaft is fixedly connected to the buffer seat and is coaxial with the piston rod; and the hydraulic buffer device is used for buffering the piston rod when the buffer seat moves relative to the piston rod. By arranging the hydraulic buffering device, after the piston rod extends in place, due to the fact that the machine tool sliding table has inertia, the machine tool sliding table drives the buffering base to move in the reverse direction away from the piston rod under the action of inertia force, and when the machine tool sliding table moves, the hydraulic buffering device can conduct buffering, so that the vibration and impact influences of the inertia force on the piston rod are small.

Description

Technical Field

[0001] The present invention relates to the technical field of oil cylinders, and more specifically, to a hydraulic oil cylinder based on piston rod vibration reduction. Background Art

[0002] The machine tool slide is mainly dragged by the hydraulic cylinder. When the machine tool slide is dragged, since the end of the piston rod of the hydraulic cylinder is connected to the machine tool slide, after the machine tool slide moves into place, due to the inertia of the machine tool slide, a large pulling force is generated on the piston rod, which can easily cause a large inertial impact between the piston rod and the hydraulic cylinder, and then generate vibration, affecting the working life of the hydraulic cylinder. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a hydraulic cylinder based on piston rod vibration reduction. The technical problem to be solved by the present invention is that the hydraulic cylinder in the prior art is easily affected by the inertia of the machine tool slide during the operation of dragging the machine tool slide, causing greater impact and vibration.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A hydraulic cylinder based on piston rod vibration reduction, comprising a hydraulic cylinder mounted on an external machine tool through a fixing plate, wherein the fixing plate is provided with a mounting hole for the piston rod of the hydraulic cylinder to pass freely, and further comprising:

[0006] A buffer seat, the buffer seat is sleeved on the end of the piston rod, and the piston rod slides freely on the buffer seat;

[0007] A connecting shaft, the connecting shaft is fixedly connected to the buffer seat and is coaxial with the piston rod;

[0008] A hydraulic buffer device is used to buffer the piston rod when the buffer seat moves relative to the piston rod.

[0009] Furthermore, the hydraulic buffer device comprises:

[0010] A buffer piston, the buffer piston is coaxially engaged in the buffer seat and can slide freely, one end of the piston rod that penetrates into the buffer seat is fixed to the buffer piston, and the buffer piston and the inner wall of one side of the buffer seat adjacent to the hydraulic cylinder form an oil storage chamber for storing hydraulic oil;

[0011] A protrusion, wherein the protrusion is fixedly connected to the outer wall of the buffer seat, and the interior of the protrusion is hollow, and a connecting hole that penetrates the interior of the protrusion is opened on the outer wall of the buffer seat;

[0012] A volume adjustment unit is provided on the protrusion and is used to adjust the volume inside the protrusion when the buffer seat moves relative to the piston rod.

[0013] Furthermore, the volume adjustment unit comprises:

[0014] An adjusting piston, the adjusting piston is coaxially engaged in the protruding portion and is free to slide along the radial direction of the buffer seat;

[0015] A floating column, wherein the floating column is vertically fixed to the end surface of the regulating piston, and the protrusion is provided with a through hole for the floating column to pass freely;

[0016] A driving structure is used to drive the floating column to move in the protrusion when the buffer seat moves relative to the piston rod.

[0017] Furthermore, a return spring is installed in the protrusion, and two ends of the return spring in the elastic force direction elastically press against the regulating piston and the outer wall of the buffer seat respectively.

[0018] Furthermore, the driving structure comprises:

[0019] A guide rod, the guide rod is connected to the outer wall of the fixed plate, and the length direction of the guide rod is consistent with the movement direction of the piston rod, and the guide rod is provided with an oblique section and a straight section in sequence in a direction away from the fixed plate;

[0020] A roller is rotatably connected to one end of the guide rod passing through the protruding portion, and the roller is in rolling contact with the side wall of the guide rod, the inclined section and the straight section surface.

[0021] Furthermore, a sealing seat is coaxially fixedly connected to one end of the buffer seat facing the fixed plate, a bypass hole for the piston rod to pass freely is opened in the sealing seat, and a sealing device is arranged in the bypass hole.

[0022] Furthermore, the sealing device comprises:

[0023] A dynamic sealing ring, which is installed in the avoidance hole and sleeved on the piston rod;

[0024] A clamping and leak-proof unit is arranged in the avoidance hole and is used to generate a squeezing force on the dynamic sealing ring along the radial inner side of the piston rod when the buffer seat moves in a direction away from the piston rod.

[0025] Furthermore, the clamping and leak-proof unit comprises:

[0026] A clamping sleeve, which is sleeved on the piston rod and installed in the avoidance hole;

[0027] A tapered sleeve, wherein the tapered sleeve is coaxially fixed to one end of the clamping sleeve facing the fixed plate, the outer diameter of the tapered sleeve increases in sequence in the direction away from the clamping sleeve, the tapered sleeve is coaxially provided with a piston rod through-hole penetrating the clamping sleeve, the piston rod is slidably penetrated through the piston rod through-hole, the tapered sleeve is coaxially provided with a sealing ring installation groove for installing the dynamic sealing ring, and the tapered edge of the tapered sleeve is provided with a plurality of strip slits penetrating the sealing ring installation groove;

[0028] An extrusion structure is arranged in the sealing seat and is used to generate an extrusion force on the tapered sleeve along the radial inner side of the tapered sleeve.

[0029] Furthermore, the extrusion structure comprises:

[0030] A sliding sleeve, the sliding sleeve is coaxially engaged in the avoidance hole and freely slides in the avoidance hole along the axial direction of the piston rod, the sliding sleeve is sleeved on the tapered sleeve, and the sliding sleeve is coaxially provided with a tapered hole for the tapered sleeve to engage;

[0031] A connecting rod is fixedly connected to the end surface of the sliding sleeve, and one end of the connecting rod penetrates into the buffer seat, and one end of the connecting rod away from the sliding sleeve is fixedly connected to the buffer piston.

[0032] Furthermore, a compression end cover is installed on the sealing seat, and the end surface of the compression end cover abuts against the end surface of the tapered sleeve.

[0033] Technical effects and advantages of the present invention:

[0034] By setting up a hydraulic buffer device, when the piston rod is extended to the full position, due to the inertia of the machine tool slide, the machine tool slide, under the action of inertia force, drives the buffer seat to move in the opposite direction away from the piston rod. During movement, the hydraulic buffer device can provide buffering, so that the inertia force has less effect on the vibration and impact of the piston rod.

[0035] By setting the volume adjustment unit, at the end of the machine tool slide's moving stroke, the roller will roll from the inclined section to the straight section, so that the volume in the protruding portion increases, which is equivalent to increasing the internal volume of the oil storage chamber. When the machine tool slide drives the buffer seat to move away from the piston rod due to inertia, the hydraulic pressure of the hydraulic oil in the oil storage chamber decreases, so that the buffer seat has a certain moving space, reducing the impact and vibration on the piston rod;

[0036] By setting a dynamic sealing ring, when the buffer seat moves in the direction away from the piston rod, the buffer piston will move relative to the buffer seat, so that the sliding sleeve squeezes the tapered sleeve, and then the inner wall of the tapered hole of the sliding sleeve squeezes the tapered surface of the tapered sleeve, so that the tapered sleeve elastically contracts, so that the tapered sleeve clamps the dynamic sealing ring, so as to prevent the hydraulic oil in the oil storage chamber from being subjected to a large force when the machine tool slide moves too far, and then overflowing from the connecting surface of the dynamic sealing ring and the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a hydraulic cylinder based on piston rod vibration reduction in the present invention;

[0038] Figure 2 for Figure 1 Schematic diagram of the top view angle;

[0039] Figure 3 for Figure 1 A schematic cross-sectional view of a part of the structure;

[0040] Figure 4 for Figure 1 The structural diagram after omitting the hydraulic cylinder;

[0041] Figure 5 for Figure 4 Schematic diagram of structural explosion decomposition;

[0042] Figure 6 for Figure 4 Schematic diagram of explosion decomposition from another angle;

[0043] Figure 7 It is a schematic cross-sectional view of the structure after the sealing seat and the buffer seat are assembled in the present invention;

[0044] Figure 8 for Figure 7 A cross-sectional view from another angle;

[0045] Fig. 9 It is a schematic diagram of the structure after the sliding sleeve and the connecting rod are assembled in the present invention;

[0046] Fig.10 for Fig. 9 Schematic diagram of the structure in cross-section;

[0047] Fig.11 It is a schematic diagram of the structure of the sliding sleeve and the clamping sleeve after being assembled in the present invention.

[0048] The accompanying drawings are marked as follows: 1. hydraulic cylinder; 2. fixing plate; 3. clamping end cover; 4. sealing seat; 5. floating column; 6. chrome plating layer; 7. protrusion; 8. connecting shaft; 9. straight section; 10. buffer seat; 11. oblique section; 12. guide rod; 13. roller; 14. piston rod; 15. return spring; 16. buffer piston; 17. adjusting piston; 18. connecting rod; 19. sliding sleeve; 20. dynamic sealing ring; 21. clamping sleeve; 22. avoidance hole; 23. clamping sleeve through hole; 24. tapered sleeve; 25. connecting hole; 26. tapered hole; 27. piston rod through hole; 28. sealing ring mounting groove; 29. ​​strip seam. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] like Figure 1-Figure 11 As shown, the present embodiment discloses: a hydraulic cylinder based on piston rod vibration reduction, comprising a hydraulic cylinder 1 mounted on an external machine tool through a fixing plate 2, a mounting hole for the piston rod 14 of the hydraulic cylinder 1 to pass freely is provided on the fixing plate 2, the end of the piston rod 14 is sleeved on a buffer seat 10, and the piston rod 14 slides freely on the buffer seat 10, the end of the buffer seat 10 away from the piston rod 14 is coaxially fixed with a connecting shaft 8, the connecting shaft 8 is also coaxial with the piston rod 14, the connecting shaft 8 is connected to the machine tool slide, the end of the piston rod 14 that penetrates into the buffer seat 10 is fixedly sleeved with a buffer piston 16, and the left end surface of the buffer piston 16 (reference Figure 3 ) and the inner wall of the buffer seat 10 form an oil storage chamber, in which hydraulic oil is stored (of course, the hydraulic oil can also be replaced by other liquid media). In the initial state, the buffer piston 16 is subjected to the liquid pressure in the oil storage chamber, so that the right end surface of the buffer piston 16 (reference Figure 3 ) abuts against the right inner wall of the buffer seat 10, so that when the piston rod 14 of the hydraulic cylinder 1 is extended, it will drive the buffer piston 16 to move, and then the end of the buffer piston 16 abuts against the inner wall of the buffer seat 10, and then drive the buffer seat 10 to move away from the fixed plate 2, so that the hydraulic cylinder 1 drives the machine tool slide to move;

[0051] The buffer seat 10 has protrusions 7 integrally connected to the radially opposite outer walls on both sides. The interior of the protrusion 7 is hollow, and the outer wall of the buffer seat 10 is provided with a connecting hole 25 that penetrates the interior of the protrusion 7, so that the interior of the protrusion 7 is in a through state with the oil storage chamber. An adjusting piston 17 is engaged with the interior of the protrusion 7. The adjusting piston 17 slides freely in the radial direction of the buffer seat 10 in the protrusion 7. A floating column 5 with a rectangular cross-section is vertically fixed to the end of the adjusting piston 17. The floating column 5 passes through the protrusion 7 and slides freely. A through hole is provided on the protrusion 7 for the floating column 5 to pass freely. A reset spring 15 is installed in the protrusion 7. The two ends of the reset spring 15 in the elastic force direction elastically press against the adjusting piston 17 and the outer wall of the buffer seat 10 respectively. 15 has an extrusion force on the adjusting piston 17 toward the outside of the protrusion 7, so that the adjusting piston 17 drives the floating column 5 to move toward the outside of the protrusion 7. The end of the floating column 5 that passes through the protrusion 7 is rotatably connected to the roller 13. In addition, the outer wall of the fixed plate 2 facing the buffer seat 10 is screwed with a guide rod 12. The length direction of the guide rod 12 is consistent with the movement direction of the piston rod 14. The guide rod 12 is sequentially provided with an inclined section 11 and a straight section 9 in the direction away from the fixed plate 2. When the buffer seat 10 moves, the roller 13 will be able to roll alternately on the side wall of the guide rod 12, the outer wall of the inclined section 11 and the outer wall of the straight section 9. In addition, a chrome-plated layer 6 is provided on the surface of the guide rod 12, so as to avoid friction and wear of the roller 13 on the surface of the guide rod 12;

[0052] The end of the buffer seat 10 facing the fixed plate 2 is coaxially fixed with a sealing seat 4, and a bypass hole 22 is provided in the sealing seat 4 for the piston rod 14 to pass freely. The end of the piston rod 14 that passes through the bypass hole 22 is sleeved with a dynamic sealing ring 20, and the dynamic sealing ring 20 is installed in the bypass hole 22. In addition, the dynamic sealing ring 20 cooperates with the piston rod 14 to seal the surface of the piston rod 14 and the sealing seat 4. A clamping sleeve 21 is installed in the bypass hole 22, and the clamping sleeve 21 is sleeved on the piston rod 14. The piston rod 14 is in a state of being freely slidable on the clamping sleeve 21. A conical sleeve 24 is coaxially fixedly connected to one end of the clamping sleeve 21 facing the fixed plate 2. The outer diameter of the conical sleeve 24 increases in sequence in the direction away from the clamping sleeve 21. A piston rod through hole 27 penetrating the clamping sleeve 21 is coaxially provided on the conical sleeve 24. The piston rod 14 is slidably provided on the piston rod through hole 27. A sealing ring installation groove 28 for installing the dynamic sealing ring 20 is coaxially provided on the conical sleeve 24. The conical edge of the conical sleeve 24 is provided with a plurality of A strip slit 29 passes through the sealing ring installation groove 28, so that when the tapered sleeve 24 is subjected to the extrusion force along the radial inner side thereof, the tapered sleeve 24 will be able to produce elastic contraction deformation, and a sliding sleeve 19 is coaxially engaged in the avoidance hole 22, and freely slides in the axial direction of the piston rod 14 in the avoidance hole 22. The sliding sleeve 19 is sleeved on the tapered sleeve 24, and a conical hole 26 for the tapered sleeve 24 to engage is coaxially opened on the sliding sleeve 19, and a clamping sleeve through hole 26 for the clamping sleeve 21 to freely pass through is also opened on the sliding sleeve 19. The end face of the sliding sleeve 19 is fixedly connected with a connecting rod 18, and one end of the connecting rod 18 penetrates into the buffer seat 10, and the end of the connecting rod 18 away from the sliding sleeve 19 is fixedly connected to the buffer piston 16, and a pressing end cover 3 is installed on the sealing seat 4, and the end face of the pressing end cover 3 is against the end face of the tapered sleeve 24. Specifically, a threaded hole is opened on the sealing seat 4, and the pressing end cover 3 is threadedly connected in the threaded hole, and the end face of one side of the pressing end cover 3 presses the tapered sleeve 24 to prevent the tapered sleeve 24 from escaping from the avoidance hole 22;

[0053] When the buffer seat 10 moves relative to the piston rod 14, the buffer piston 16 moves relative to the buffer seat 10, and then the buffer piston 16 generates an extrusion force on the hydraulic oil in the oil storage chamber. When the roller 13 rolls from the inclined section 11 to the straight section 9, the return spring 15 drives the regulating piston 17 to move away from the buffer seat 10, so that the volume of the oil storage chamber increases, so that the hydraulic pressure of the hydraulic oil on the buffer piston 16 is reduced, and then when the machine tool slide moves into place, it continues to move a small stroke due to inertia. At this time, the buffer piston 16 can move a certain stroke to avoid generating a large pulling force on the piston rod 14. In addition, since the buffer piston 16 exerts an extrusion force on the oil storage chamber, The pressure of the hydraulic oil in the cylinder increases, which may cause the hydraulic oil to leak from the connection surface between the dynamic seal ring 20 and the piston rod 14. Therefore, when the buffer piston 16 moves relative to the buffer seat 10, the sliding sleeve 19 can move toward the tapered sleeve 24 through the connection of the connecting rod 18, so that the inner wall of the tapered hole 26 on the sliding sleeve 19 produces an extrusion force on the tapered surface of the tapered sleeve 24, causing the tapered sleeve 24 to produce elastic contraction, and then the seal ring mounting groove 28 on the tapered sleeve 24 squeezes the dynamic seal ring 20, so that the dynamic seal ring 20 tightly holds the piston rod 14, thereby reducing the hidden danger of hydraulic oil leakage from the connection surface between the piston rod 14 and the dynamic seal ring 20.

[0054] Working principle of the present invention: In the initial state, the buffer piston 16 is subjected to the hydraulic pressure in the oil storage chamber, so that the right end surface of the buffer piston 16 (reference Figure 3 ) abuts against the right inner wall of the buffer seat 10, so that when the piston rod 14 of the hydraulic cylinder 1 is extended, it will drive the buffer piston 16 to move, and then the end of the buffer piston 16 abuts against the inner wall of the buffer seat 10, and then drive the buffer seat 10 to move away from the fixed plate 2, so that the hydraulic cylinder 1 drives the machine tool slide to move;

[0055] When the buffer seat 10 moves relative to the piston rod 14, the buffer piston 16 moves relative to the buffer seat 10, and then the buffer piston 16 generates an extrusion force on the hydraulic oil in the oil storage chamber. When the roller 13 rolls from the inclined section 11 to the straight section 9, the return spring 15 drives the regulating piston 17 to move away from the buffer seat 10, so that the volume of the oil storage chamber increases, so that the hydraulic pressure of the hydraulic oil on the buffer piston 16 is reduced, and then when the machine tool slide moves into place, it continues to move a small stroke due to inertia. At this time, the buffer piston 16 can move a certain stroke to avoid generating a large pulling force on the piston rod 14. In addition, since the buffer piston 16 exerts an extrusion force on the oil storage chamber, The pressure of the hydraulic oil in the cylinder increases, which may cause the hydraulic oil to leak from the connection surface between the dynamic seal ring 20 and the piston rod 14. Therefore, when the buffer piston 16 moves relative to the buffer seat 10, the sliding sleeve 19 can move toward the tapered sleeve 24 through the connection of the connecting rod 18, so that the inner wall of the tapered hole 26 on the sliding sleeve 19 produces an extrusion force on the tapered surface of the tapered sleeve 24, causing the tapered sleeve 24 to produce elastic contraction, and then the seal ring mounting groove 28 on the tapered sleeve 24 squeezes the dynamic seal ring 20, so that the dynamic seal ring 20 tightly holds the piston rod 14, thereby reducing the hidden danger of hydraulic oil leakage from the connection surface between the piston rod 14 and the dynamic seal ring 20.

[0056] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0057] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0058] Finally: The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic cylinder based on piston rod vibration reduction, comprising a hydraulic cylinder (1) mounted on an external machine tool via a fixing plate (2), wherein the fixing plate (2) is provided with a mounting hole for the piston rod (14) of the hydraulic cylinder (1) to freely pass through, characterized in that: Also includes: A buffer seat (10), wherein the buffer seat (10) is sleeved on the end of the piston rod (14), and the piston rod (14) slides freely on the buffer seat (10); A connecting shaft (8), the connecting shaft (8) being fixedly connected to the buffer seat (10) and being coaxial with the piston rod (14); A hydraulic buffer device is used to generate buffer for the piston rod (14) when the buffer seat (10) moves relative to the piston rod (14).

2. A hydraulic cylinder based on piston rod vibration reduction according to claim 1, characterized in that: The hydraulic buffer device comprises: A buffer piston (16), the buffer piston (16) is coaxially engaged in the buffer seat (10) and can slide freely, one end of the piston rod (14) that penetrates into the buffer seat (10) is fixed to the buffer piston (16), and the buffer piston (16) and the inner wall of one side of the buffer seat (10) adjacent to the hydraulic cylinder (1) form an oil storage chamber for storing hydraulic oil; A protrusion (7), the protrusion (7) being fixedly connected to the outer wall of the buffer seat (10), the interior of the protrusion (7) being hollow, and a connecting hole (25) penetrating the interior of the protrusion (7) being provided on the outer wall of the buffer seat (10); A volume adjustment unit is provided on the protruding portion (7) and is used to adjust the volume inside the protruding portion (7) when the buffer seat (10) moves relative to the piston rod (14).

3. A hydraulic cylinder based on piston rod vibration reduction according to claim 2, characterized in that: The volume adjustment unit comprises: an adjusting piston (17), the adjusting piston (17) being coaxially engaged in the protruding portion (7) and freely sliding along the radial direction of the buffer seat (10); A floating column (5), wherein the floating column (5) is vertically fixed to the end surface of the regulating piston (17), and the protruding portion (7) is provided with a through hole for the floating column (5) to freely pass through; A driving structure is provided, wherein the driving structure is used to drive the floating column (5) to move in the protruding portion (7) when the buffer seat (10) moves relative to the piston rod (14).

4. A hydraulic cylinder based on piston rod vibration reduction according to claim 3, characterized in that: A return spring (15) is installed in the protruding portion (7), and two ends of the return spring (15) in the elastic force direction elastically press against the regulating piston (17) and the outer wall of the buffer seat (10) respectively.

5. The hydraulic cylinder based on piston rod vibration reduction according to claim 3, characterized in that: The driving structure comprises: A guide rod (12), the guide rod (12) being connected to the outer wall of the fixed plate (2), and the length direction of the guide rod (12) being consistent with the movement direction of the piston rod (14), and the guide rod (12) being provided with an inclined section (11) and a straight section (9) in sequence in a direction away from the fixed plate (2); A roller (13) is rotatably connected to one end of the guide rod (12) that passes through the protruding portion (7), and the roller (13) is in rolling contact with the side wall of the guide rod (12), the inclined section (11) and the surface of the straight section (9).

6. The hydraulic cylinder based on piston rod vibration reduction according to claim 3, characterized in that: A sealing seat (4) is coaxially fixedly connected to one end of the buffer seat (10) facing the fixed plate (2), and a relief hole (22) is provided in the sealing seat (4) for the piston rod (14) to pass freely, and a sealing device is provided in the relief hole (22).

7. A hydraulic cylinder based on piston rod vibration reduction according to claim 6, characterized in that: The sealing device comprises: A dynamic sealing ring (20), the dynamic sealing ring (20) is installed in the avoidance hole (22) and sleeved on the piston rod (14); A clamping and leak-proof unit is arranged in the avoidance hole (22) and is used to generate a squeezing force on the dynamic sealing ring (20) along the radial inner side of the piston rod (14) when the buffer seat (10) moves in a direction away from the piston rod (14).

8. The hydraulic cylinder based on piston rod vibration reduction according to claim 7, characterized in that: The clamping and leak-proof unit comprises: A clamping sleeve (21), the clamping sleeve (21) is sleeved on the piston rod (14) and installed in the avoidance hole (22); A conical sleeve (24), the conical sleeve (24) is coaxially fixed to one end of the clamping sleeve (21) facing the fixed plate (2), the outer diameter of the conical sleeve (24) increases in sequence in the direction away from the clamping sleeve (21), the conical sleeve (24) is coaxially provided with a piston rod through hole (27) penetrating the clamping sleeve (21), the piston rod (14) is slidably penetrated through the piston rod through hole (27), the conical sleeve (24) is coaxially provided with a sealing ring installation groove (28) for installing the dynamic sealing ring (20), and the conical edge of the conical sleeve (24) is provided with a plurality of strip slits (29) penetrating the sealing ring installation groove (28); An extrusion structure is arranged in the sealing seat (4) and is used to generate an extrusion force on the tapered sleeve (24) along the radial inner side of the tapered sleeve (24).

9. A hydraulic cylinder based on piston rod vibration reduction according to claim 8, characterized in that: The extrusion structure comprises: A sliding sleeve (19), the sliding sleeve (19) is coaxially engaged in the avoidance hole (22) and freely slides in the avoidance hole (22) along the axial direction of the piston rod (14), the sliding sleeve (19) is sleeved on the tapered sleeve (24), and the sliding sleeve (19) is coaxially provided with a tapered hole (26) for the tapered sleeve (24) to engage; A connecting rod (18), wherein the connecting rod (18) is fixedly connected to the end surface of the sliding sleeve (19), and one end of the connecting rod (18) penetrates into the buffer seat (10), and one end of the connecting rod (18) away from the sliding sleeve (19) is fixedly connected to the buffer piston (16).

10. The hydraulic cylinder based on piston rod vibration reduction according to claim 8, characterized in that: A compression end cover (3) is mounted on the sealing seat (4), and an end surface of the compression end cover (3) abuts against an end surface of the conical sleeve (24).

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