Hydraulic cylinder of press machine

Abstract

The utility model provides a hydraulic cylinder of a press machine, which relates to the technical field of press machines and comprises a cylinder body, a piston and a first sealing component. The cylinder body is provided with a hydraulic cavity; the piston is movably mounted in the hydraulic cavity; the first sealing assembly comprises a plurality of guide rings and piston sealing rings, the guide rings are sequentially arranged on the peripheral wall face of the piston at intervals in a sleeving mode in the axial direction of the piston, and the piston sealing rings are embedded between every two adjacent guide rings. The inner side and the outer side of the piston sealing ring make contact with the peripheral wall face of the piston and the cavity wall face of the hydraulic cavity respectively. The hydraulic cylinder of the press machine can prolong the service life and improve the sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of presses, and particularly to a hydraulic cylinder of a press. Background Art

[0002] The hydraulic cylinder of a press is a key component for generating pressure in the press. It utilizes the hydraulic principle, and the piston is driven to move by the acting force of hydraulic oil, so as to drive the piston rod to press or form the workpiece. In order to ensure the working pressure, it usually needs to ensure good sealing at the piston.

[0003] At present, the hydraulic cylinder of a press usually sets a sealing ring on the circumferential wall of the piston to ensure the seal between the circumferential wall of the piston and the inner wall of the cylinder block. However, when the press is working, it often brings a large eccentric load to the piston of the hydraulic cylinder of the press, causing the piston to shift to one side, resulting in local circumferential extrusion of the sealing ring by the piston and the cylinder block, which easily causes fatigue damage to the sealing ring and further affects the service life of the sealing ring. Summary of the Utility Model

[0004] The problem solved by the utility model is: how to improve the service life of the sealing ring.

[0005] To solve the above problems, the utility model provides a hydraulic cylinder of a press.

[0006] The utility model provides a hydraulic cylinder of a press, which includes a cylinder block, a piston and a first sealing assembly; the cylinder block has a hydraulic cavity; the piston is movably installed in the hydraulic cavity; the first sealing assembly includes a guide ring and a piston sealing ring. There are multiple guide rings, and the multiple guide rings are sequentially sleeved on the circumferential wall of the piston at intervals along the axial direction of the piston. The piston sealing ring is embedded between two adjacent guide rings, and the inner and outer sides of the piston sealing ring are respectively in contact with the circumferential wall of the piston and the wall surface of the hydraulic cavity.

[0007] Optionally, the multiple guide rings include a first guide ring and two second guide rings. The first guide ring is sleeved on the middle part of the circumferential wall of the piston along the axial direction of the piston, and the two second guide rings are respectively sleeved on both ends of the circumferential wall of the piston along the axial direction of the piston.

[0008] Optionally, a fixing groove surrounding the piston is formed on the circumferential wall of the piston; the guide ring is embedded in the fixing groove, and its outer side protrudes from the notch of the fixing groove.

[0009] Optionally, the piston sealing ring includes a first support ring, a first pressure ring, and a plurality of first inner rings arranged between the first support ring and the first pressure ring, the cross-section of the first inner ring is a V-shape open toward the first pressure ring, the plurality of first inner rings are stacked in sequence along a direction toward the first pressure ring, a groove matching the shape of the first inner ring is provided on one side of the first support ring close to the first inner ring, and a convex portion matching the shape of the first inner ring is provided on one side of the first pressure ring close to the first inner ring.

[0010] Optionally, a cylinder head flange is provided at one end of the cylinder body; a piston rod is connected to the piston, and one end of the piston rod passes through the cylinder head flange and extends out of the cylinder body; the press hydraulic cylinder also includes a second sealing assembly, the second sealing assembly includes a flange sealing ring and two guide sleeves, the two guide sleeves are arranged between the circumferential wall surface of the piston rod and the inner circumferential surface of the cylinder head flange and are arranged at intervals along the axial direction of the cylinder head flange, the flange sealing ring is embedded between the two guide sleeves, and the inner and outer sides are respectively in contact with the circumferential wall surface of the piston rod and the inner circumferential surface of the cylinder head flange.

[0011] Optionally, the inner circumferential surface of the cylinder head flange is provided with an annular boss abutting against the side of the second sealing assembly close to the piston; the press hydraulic cylinder also includes an end cover, which is provided on the side of the cylinder head flange away from the piston and abuts against the side of the second sealing assembly away from the piston.

[0012] Optionally, the end cover is adjustable relative to the cylinder head flange along the axial direction of the piston rod so as to tighten or loosen the flange sealing ring through the two guide sleeves.

[0013] Optionally, an elastic gasket is provided between the end cover and the cylinder head flange, a countersunk hole extending axially along the piston rod is provided on the side of the cylinder head flange facing away from the piston, a through hole coaxial with the countersunk hole is provided on the elastic gasket, and a through hole coaxial with the through hole is provided on the end cover; the press hydraulic cylinder also includes an adjusting bolt, which is sequentially passed through the through hole, the through hole and the countersunk hole.

[0014] Optionally, the flange sealing ring includes a second support ring, a second pressure ring, and a plurality of second inner rings arranged between the second support ring and the second pressure ring, the cross-section of the second inner ring is a V-shape open toward the second pressure ring, the plurality of second inner rings are stacked in sequence along a direction toward the second pressure ring, a side of the second support ring close to the second inner ring is provided with a recess adapted to the shape of the second inner ring, and a side of the second pressure ring close to the second inner ring is provided with a protrusion adapted to the shape of the second inner ring.

[0015] Optionally, the guiding ring and the guiding sleeve are made of copper alloy.

[0016] The beneficial effects of the hydraulic cylinder of the press of the present utility model are as follows: The cylinder block has a hydraulic cavity, and the piston is movably installed in the hydraulic cavity, so that a first sealing assembly can be installed between the peripheral wall surface of the piston and the cavity wall surface of the hydraulic cavity. At the same time, by setting the first sealing assembly, a plurality of guiding rings of the first sealing assembly are sequentially sleeved on the peripheral wall surface of the piston at intervals along the axial direction of the piston, so that a piston sealing ring of the first sealing assembly can be embedded between two adjacent guiding rings. In this way, if the piston deviates to one side during the movement, the plurality of guiding rings can form a certain supporting effect on the cavity wall surface of the hydraulic cavity, protecting the piston sealing ring between the guiding rings and preventing local circumferential over-extrusion of the piston sealing ring, thereby avoiding fatigue damage and improving the service life of the sealing ring; moreover, a piston sealing ring is embedded between two adjacent guiding rings, and the inner and outer sides of the piston sealing ring are respectively in contact with the peripheral wall surface of the piston and the cavity wall surface of the hydraulic cavity, that is, there are a plurality of piston sealing rings between the peripheral wall surface of the piston and the cavity wall surface of the hydraulic cavity for sealing. The relatively large number of sealing rings can relatively increase the leakage path of the hydraulic oil, thereby improving the sealing performance of the hydraulic cylinder. Description of the Drawings

[0017] Figure 1 is a sectional view of the hydraulic cylinder of the press in the embodiment of the present utility model;

[0018] Figure 2 is a partial schematic view of the hydraulic cylinder of the press in the embodiment of the present utility model at the piston;

[0019] Figure 3 is a partial schematic view of the hydraulic cylinder of the press in the embodiment of the present utility model at the first sealing assembly;

[0020] Figure 4 is a partial schematic view of the hydraulic cylinder of the press in the embodiment of the present utility model at the cylinder head flange.

[0021] Description of the Reference Numerals:

[0022] 1. Cylinder block; 11. Hydraulic cavity; 12. Cylinder bottom flange; 2. Piston; 21. Fixed groove; 3. First sealing assembly; 31. Guiding ring; 311. First guiding ring; 312. Second guiding ring; 32. Piston sealing ring; 321. First support ring; 322. First pressing ring; 323. First inner ring; 4. Cylinder head flange; 41. Ring-shaped shoulder; 5. Piston rod; 6. Second sealing assembly; 61. Flange sealing ring; 611. Second support ring; 612. Second pressing ring; 613. Second inner ring; 62. Guiding sleeve; 7. End cover; 8. Elastic gasket; 9. Adjusting bolt. Detailed Embodiments

[0023] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the following provides a detailed description of specific embodiments of the present utility model with reference to the accompanying drawings. Although some embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be construed as limited to the embodiments described herein. Instead, these embodiments are provided to more thoroughly and completely understand the present utility model. It should be understood that the drawings and embodiments of the present utility model are only for exemplary purposes and are not used to limit the protection scope of the present utility model.

[0024] In the accompanying drawings, the Z-axis represents the vertical direction, that is, the up-and-down position, and the positive direction of the Z-axis represents the upper side, while the negative direction of the Z-axis represents the lower side; the X-axis in the accompanying drawings represents the horizontal direction and is designated as the front-and-back position, and the positive direction of the X-axis represents the front side, and the negative direction of the X-axis represents the rear side. At the same time, it should be noted that the above-mentioned meanings represented by the Z-axis and the X-axis are only for facilitating the description of the present utility model 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 to the present utility model.

[0025] The term "including" and its variants used herein are open-ended, that is, "including but not limited to"; the term "based on" means "at least partially based on"; the term "an embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order or interdependence relationship of the functions performed by these devices, modules, or units.

[0026] It should be noted that the modifications of "one" and "multiple" mentioned in the present utility model are illustrative rather than restrictive. Those skilled in the art should understand that unless clearly stated otherwise in the context, it should be understood as "one or more".

[0027] The present utility model provides a hydraulic cylinder for a press to improve the service life of the sealing ring. The following provides a detailed description in combination with specific embodiments.

[0028] Such as Figure 1 and Figure 2As shown in the figure, a hydraulic cylinder of a press provided by an embodiment of the present utility model includes a cylinder block 1, a piston 2, and a first sealing assembly 3; the cylinder block 1 has a hydraulic cavity 11; the piston 2 is movably installed in the hydraulic cavity 11; the first sealing assembly 3 includes a guide ring 31 and a piston sealing ring 32. A plurality of the guide rings 31 are provided, and the plurality of guide rings 31 are sequentially sleeved on the peripheral wall surface of the piston 2 at intervals along the axial direction of the piston 2. The piston sealing ring 32 is embedded between two adjacent guide rings 31. The inner and outer sides of the piston sealing ring 32 are respectively in contact with the peripheral wall surface of the piston 2 and the wall surface of the hydraulic cavity 11.

[0029] Specifically, the shape of the hydraulic cavity 11 can be cylindrical, and the piston 2 can be a hollow cylindrical shape adapted to the shape of the hydraulic cavity 11, and a piston rod 5 can be inserted therein. It should be noted that the piston 2 is movably installed in the hydraulic cavity 11, that is, the piston 2 is located in the hydraulic cavity 11 and can reciprocate along the axial direction of the hydraulic cavity 11. It should also be noted that the number of the guide rings 31 is multiple, and multiple means more than three. For example, the number of the guide rings 31 can be three, and at this time the corresponding number of the piston sealing rings 32 is two.

[0030] In this embodiment, the cylinder block 1 has a hydraulic cavity 11, and the piston 2 is movably installed in the hydraulic cavity 11, so that the first sealing assembly 3 can be installed between the peripheral wall surface of the piston 2 and the wall surface of the hydraulic cavity 11. At the same time, by setting the first sealing assembly 3, the plurality of guide rings 31 of the first sealing assembly 3 are sequentially sleeved on the peripheral wall surface of the piston 2 at intervals along the axial direction of the piston 2, so that the piston sealing ring 32 of the first sealing assembly 3 can be embedded between two adjacent guide rings 31. In this way, if the piston 2 offsets toward one side (such as Figure 1 the positive or negative direction of the Z-axis shown in the figure) during the movement, the plurality of guide rings 31 can form a certain supporting effect on the wall surface of the hydraulic cavity 11, protect the piston sealing ring 32 between the guide rings 31, and avoid fatigue damage caused by excessive circumferential partial extrusion of the piston sealing ring 32, thereby improving the service life of the sealing ring; and, the piston sealing ring 32 is embedded between two adjacent guide rings 31, and the inner and outer sides of the piston sealing ring 32 are respectively in contact with the peripheral wall surface of the piston 2 and the wall surface of the hydraulic cavity 11, that is, there are a plurality of piston sealing rings 32 between the peripheral wall surface of the piston 2 and the wall surface of the hydraulic cavity 11 for sealing. The relatively large number of sealing rings can relatively increase the leakage path of the hydraulic oil, thereby improving the sealing performance of the hydraulic cylinder.

[0031] Optionally, as Figure 2 and Figure 3As shown, a plurality of the guide rings 31 include a first guide ring 311 and two second guide rings 312. The first guide ring 311 is sleeved on the middle part of the circumferential wall surface of the piston 2 along the axial direction of the piston 2, and the two second guide rings 312 are respectively sleeved on both ends of the circumferential wall surface of the piston 2 along the axial direction of the piston 2.

[0032] It should be noted that the outer peripheral surfaces of the plurality of guide rings 31 are coplanarly arranged, and the outer peripheral surfaces of the plurality of guide rings 31 are in sliding fit with the wall surface of the hydraulic chamber 11 to guide the movement stroke of the piston 2. Specifically, in this embodiment, the outer peripheral surfaces of the first guide ring 311 and the two second guide rings 312 are coplanar. Specifically, the width of the first guide ring 311 is greater than the width of the second guide ring 312, so that a larger contact area is provided in the middle of the plurality of guide rings 31, and the structural strength in the middle is improved.

[0033] In this alternative embodiment, by sleeving the first guide ring 311 on the middle part of the circumferential wall surface of the piston 2 along the axial direction of the piston 2, and respectively sleeving the two second guide rings 312 on both ends of the circumferential wall surface of the piston 2 along the axial direction of the piston 2, the first guide ring 311 and the second guide rings 312 occupy more of the circumferential wall surface of the piston 2. When the size of the piston 2 is determined, this setting can relatively increase the circumferential surface size of the plurality of guide rings 31, improve the guiding performance of the plurality of guide rings 31, and thus enable the piston 2 to have a smoother movement track.

[0034] Optionally, as Figure 2 and Figure 3 shown, a fixing groove 21 is formed on the circumferential wall surface of the piston 2 and is arranged around the piston 2; the guide ring 31 is embedded in the fixing groove 21, and its outer side protrudes from the notch of the fixing groove 21.

[0035] Specifically, the cross section of the guide ring 31 can be rectangular, and the cross section of the fixing groove 21 can also be rectangular. The width of the guide ring 31 is adapted to the width of the fixing groove 21, and the inner circumferential part of the guide ring 31 is embedded in the fixing groove 21.

[0036] In this alternative embodiment, by forming a fixing groove 21 arranged around the piston 2 on the circumferential wall surface of the piston 2, and embedding the guide ring 31 in the fixing groove 21, the guide ring 31 is fixed to the piston 2 to prevent the guide ring 31 from moving due to the movement of the piston 2.

[0037] Optionally, as Figure 3As shown, the piston seal ring 32 includes a first support ring 321, a first pressing ring 322, and a plurality of first inner rings 323 disposed between the first support ring 321 and the first pressing ring 322. The cross-section of the first inner ring 323 is V-shaped with an opening towards the first pressing ring 322. The plurality of first inner rings 323 are stacked in sequence in the direction towards the first pressing ring 322. A groove adapted to the shape of the first inner ring 323 is provided on one side of the first support ring 321 close to the first inner ring 323, and a convex portion adapted to the shape of the first inner ring 323 is provided on one side of the first pressing ring 322 close to the first inner ring 323.

[0038] In this alternative embodiment, the cross-section of the first inner ring 323 is V-shaped with an opening towards the first pressing ring 322. When the hydraulic oil pressure acts, the pressure causes the first inner ring 323 to expand towards both sides, making the two sides of the first inner ring 323 contact the peripheral wall surface of the piston 2 and the wall surface of the hydraulic chamber 11 more closely, thereby improving the contact state and increasing the contact stress, and further enhancing the sealing effect. At the same time, by stacking the V-shaped first inner rings 323 in sequence in the direction towards the first pressing ring 322, the plurality of first inner rings 323 can successively weaken the pressure of the hydraulic oil, making it difficult for the hydraulic oil to leak, and further improving the sealing effect. Additionally, through the first support ring 321 and the first pressing ring 322, the first support ring 321 and the first pressing ring 322 can respectively abut against two adjacent guide rings 31 to press the plurality of first inner rings 323 therebetween, making the contact between the plurality of first inner rings 323 closer to prevent the leakage of the hydraulic oil and further improving the sealing effect.

[0039] Optionally, as Figure 1 and Figure 4 shown, one end of the cylinder block 1 is provided with a cylinder head flange 4; a piston rod 5 is connected to the piston 2, and one end of the piston rod 5 passes through the cylinder head flange 4 and extends outside the cylinder block 1; the hydraulic press hydraulic cylinder further includes a second sealing assembly 6, the second sealing assembly 6 includes a flange sealing ring 61 and two guide sleeves 62. The two guide sleeves 62 are disposed between the peripheral wall surface of the piston rod 5 and the inner peripheral surface of the cylinder head flange 4 and are spaced along the axial direction of the cylinder head flange 4. The flange sealing ring 61 is embedded between the two guide sleeves 62, and its inner and outer sides are respectively in contact with the peripheral wall surface of the piston rod 5 and the inner peripheral surface of the cylinder head flange 4.

[0040] It should be noted that the guide sleeve 62 can be disposed on the inner peripheral surface of the cylinder head flange 4, and its inner peripheral surface is in sliding fit with the peripheral wall surface of the piston rod 5 to guide the movement stroke of the piston rod 5. Specifically, the other end of the cylinder block 1 can be provided with a cylinder bottom flange 12, and the cylinder head flange 4 and the cylinder bottom flange 12 respectively cover the two open ends of the hydraulic chamber 11.

[0041] In this optional embodiment, the two guide sleeves 62 of the second sealing assembly 6 are arranged between the circumferential wall surface of the piston rod 5 and the inner circumferential surface of the cylinder head flange 4 to guide the movable stroke of the piston rod 5. The two guide sleeves 62 are combined together to guide the piston rod 5 and have a larger contact area with the piston rod 5, which is beneficial to improve the guiding performance, thereby allowing the piston rod 5 to have a smoother moving trajectory; at the same time, the flange sealing ring 61 is embedded between the two guide sleeves 62, and the two guide sleeves 62 can cooperate to compress the flange sealing ring 61, so that the flange sealing ring 61 is in closer contact with the circumferential wall surface of the piston rod 5 and the inner circumferential surface of the cylinder head flange 4, thereby enhancing the sealing effect.

[0042] Alternatively, if Figure 1 and Figure 4 As shown, the inner circumferential surface of the cylinder head flange 4 is provided with an annular boss 41 abutting against the side of the second sealing assembly 6 close to the piston 2; the press hydraulic cylinder also includes an end cover 7, which is provided on the side of the cylinder head flange 4 facing away from the piston 2 and abutting against the side of the second sealing assembly 6 facing away from the piston 2.

[0043] Specifically, a step surface may be provided on the side of the second sealing assembly 6 facing away from the piston 2 , and the end cover 7 abuts against the step surface.

[0044] In this optional embodiment, the annular boss 41 and the end cover 7 can jointly clamp the two guide sleeves 62 and the flange sealing ring 61, thereby pressing the flange sealing ring 61 between the two guide sleeves 62 through the two guide sleeves 62, so that the flange sealing ring 61 is in closer contact with the circumferential wall surface of the piston rod 5 and the inner circumferential surface of the cylinder head flange 4, thereby improving the sealing performance.

[0045] Alternatively, if Figure 1 and Figure 4 As shown, the end cover 7 is adjustable relative to the cylinder head flange 4 along the axial position of the piston rod 5 so as to tighten or loosen the flange sealing ring 61 through the two guide sleeves 62 .

[0046] It can be understood that when the end cover 7 is positioned close to the cylinder head flange 4 through position adjustment, the end cover 7 will drive the adjacent guide sleeve 62 to approach the other guide sleeve 62 to compress the flange sealing ring 61; when the end cover 7 is positioned away from the cylinder head flange 4 through position adjustment, the flange sealing ring 61 recovers under its own elastic restoring force and drives the guide sleeve 62 adjacent to the end cover 7 away from the other guide sleeve 62, thereby preventing the flange sealing ring 61 from loosening.

[0047] In this optional embodiment, by making the end cover 7 adjustable relative to the cylinder head flange 4 along the axial position of the piston rod 5, when leakage occurs at the seal of the piston rod 5, the end cover 7 can be adjusted to increase the compression amount of the flange sealing ring 61, so that the flange sealing ring 61 is further compressed, thereby improving the oil leakage problem.

[0048] Alternatively, if Figure 1 and Figure 4 As shown, an elastic gasket 8 is provided between the end cover 7 and the cylinder head flange 4, a countersunk hole extending axially along the piston rod 5 is provided on the side of the cylinder head flange 4 facing away from the piston 2, a through hole coaxial with the countersunk hole is provided on the elastic gasket 8, and a through hole coaxial with the through hole is provided on the end cover 7; the press hydraulic cylinder also includes an adjusting bolt 9, and the adjusting bolt 9 is sequentially passed through the through hole, the through hole and the countersunk hole.

[0049] It can be understood that when the adjusting bolt 9 is screwed in or out at the through hole, through hole and countersunk hole, the adjusting bolt 9 can tighten or loosen the elastic gasket 8 through the end cover 7 to adjust the distance between the end cover 7 and the cylinder head flange 4, so as to tighten or loosen the flange sealing ring 61 through the two guide sleeves 62.

[0050] In this optional embodiment, the distance between the end cover 7 and the cylinder head flange 4 can be adjusted by the elastic gasket 8 and the adjusting bolt 9, so that the flange sealing ring 61 can be tightened or loosened by the two guide sleeves 62. The structure is relatively simple, and leakage repair is fast and convenient.

[0051] Alternatively, if Figure 4 As shown, the flange sealing ring 61 includes a second support ring 611, a second pressure ring 612 and a plurality of second inner rings 613 arranged between the second support ring 611 and the second pressure ring 612, the cross-section of the second inner ring 613 is a V-shape open toward the second pressure ring 612, and the plurality of second inner rings 613 are stacked in sequence along the direction toward the second pressure ring 612, and a side of the second support ring 611 close to the second inner ring 613 is provided with a recess matched with the shape of the second inner ring 613, and a side of the second pressure ring 612 close to the second inner ring 613 is provided with a protrusion matched with the shape of the second inner ring 613.

[0052] In this alternative embodiment, the cross-section of the second inner ring 613 is V-shaped and open towards the second pressing ring 612. When the hydraulic oil pressure acts, the pressure causes the second inner ring 613 to expand towards both sides, making the two sides of the second inner ring 613 contact the peripheral wall surface of the piston rod 5 and the inner peripheral surface of the cylinder head flange 4 more closely, thereby improving the contact state and increasing the contact stress, and further enhancing the sealing effect. At the same time, by stacking a plurality of V-shaped second inner rings 613 in sequence along the direction towards the second pressing ring 612, the plurality of second inner rings 613 can successively weaken the pressure of the hydraulic oil, making it difficult for the hydraulic oil to leak, and further improving the sealing effect. Additionally, through the second support ring 611 and the second pressing ring 612, the second support ring 611 and the second pressing ring 612 can respectively abut against two adjacent guide sleeves 62 to compress the plurality of second inner rings 613 therebetween, making the plurality of second inner rings 613 contact more closely to prevent the leakage of hydraulic oil and further improving the sealing effect.

[0053] Optionally, the guiding ring 31 and the guide sleeve 62 are made of copper alloy.

[0054] Specifically, the copper alloy can be ZCuSn13Pb9.

[0055] In this alternative embodiment, the copper alloy has high strength, a small friction coefficient and good wear resistance, which is beneficial to ensuring the guiding property of the movement of the piston 2 or the piston rod 5, making the movement of the piston 2 or the piston rod 5 smoother. At the same time, it is beneficial to reducing the wear generated during the movement process and improving the service life of the hydraulic cylinder.

[0056] Although the present utility model is disclosed as above, the protection scope of the present utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, and these changes and modifications will all fall within the protection scope of the present utility model.

Claims

1. A hydraulic cylinder for a press machine, characterized in that: The invention comprises a cylinder body (1), a piston (2) and a first sealing assembly (3); the cylinder body (1) has a hydraulic chamber (11); the piston (2) is movably installed in the hydraulic chamber (11); the first sealing assembly (3) comprises a guide ring (31) and a piston sealing ring (32); a plurality of guide rings (31) are provided, and the plurality of guide rings (31) are sleeved on the peripheral wall surface of the piston (2) in sequence and at intervals along the axial direction of the piston (2); the piston sealing ring (32) is embedded between two adjacent guide rings (31); the inner and outer sides of the piston sealing ring (32) are in contact with the peripheral wall surface of the piston (2) and the cavity wall surface of the hydraulic chamber (11) respectively.

2. The press hydraulic cylinder according to claim 1, characterized in that: The plurality of guide rings (31) include a first guide ring (311) and two second guide rings (312); the first guide ring (311) is sleeved on the middle part of the peripheral wall surface of the piston (2) along the axial direction of the piston (2); and the two second guide rings (312) are sleeved on the two ends of the peripheral wall surface of the piston (2) along the axial direction of the piston (2), respectively.

3. The press hydraulic cylinder according to claim 1, characterized in that: The peripheral wall surface of the piston (2) is provided with a fixing groove (21) arranged around the piston (2); the guide ring (31) is embedded in the fixing groove (21), and its outer side protrudes from the notch of the fixing groove (21).

4. The press hydraulic cylinder according to claim 1, characterized in that: The piston sealing ring (32) includes a first support ring (321), a first pressure ring (322), and a plurality of first inner rings (323) arranged between the first support ring (321) and the first pressure ring (322), wherein the cross section of the first inner ring (323) is a V-shape open toward the first pressure ring (322), and the plurality of first inner rings (323) are stacked in sequence along the direction toward the first pressure ring (322), and a groove matching the shape of the first inner ring (323) is provided on one side of the first support ring (321) close to the first inner ring (323), and a convex portion matching the shape of the first inner ring (323) is provided on one side of the first pressure ring (322) close to the first inner ring (323).

5. The press hydraulic cylinder according to claim 1, characterized in that: A cylinder head flange (4) is provided at one end of the cylinder body (1); a piston rod (5) is connected to the piston (2), one end of the piston rod (5) passes through the cylinder head flange (4) and extends out of the cylinder body (1); the press hydraulic cylinder also includes a second sealing assembly (6), the second sealing assembly (6) includes a flange sealing ring (61) and two guide sleeves (62), the two guide sleeves (62) are arranged between the circumferential wall surface of the piston rod (5) and the inner circumferential surface of the cylinder head flange (4) and are arranged at intervals along the axial direction of the cylinder head flange (4), the flange sealing ring (61) is embedded between the two guide sleeves (62), and the inner and outer sides are respectively in contact with the circumferential wall surface of the piston rod (5) and the inner circumferential surface of the cylinder head flange (4).

6. The hydraulic cylinder of a press machine according to claim 5, characterized in that: The inner circumferential surface of the cylinder head flange (4) is provided with an annular boss (41) which abuts against the side of the second sealing assembly (6) close to the piston (2); the press hydraulic cylinder also includes an end cover (7), which is provided on the side of the cylinder head flange (4) facing away from the piston (2) and abuts against the side of the second sealing assembly (6) facing away from the piston (2).

7. The hydraulic cylinder of a press machine according to claim 6, characterized in that: The end cover (7) is adjustable in position relative to the cylinder head flange (4) along the axial direction of the piston rod (5) so as to tighten or loosen the flange sealing ring (61) through the two guide sleeves (62).

8. The hydraulic cylinder of a press machine according to claim 7, characterized in that: An elastic gasket (8) is provided between the end cover (7) and the cylinder head flange (4); a countersunk hole extending axially along the piston rod (5) is provided on the side of the cylinder head flange (4) facing away from the piston (2); a through hole coaxial with the countersunk hole is provided on the elastic gasket (8); and a through hole coaxial with the through hole is provided on the end cover (7); the press hydraulic cylinder also includes an adjusting bolt (9), and the adjusting bolt (9) is sequentially penetrated through the through hole, the through hole and the countersunk hole.

9. The hydraulic cylinder of a press machine according to claim 5, characterized in that: The flange sealing ring (61) includes a second supporting ring (611), a second pressing ring (612), and a plurality of second inner rings (613) arranged between the second supporting ring (611) and the second pressing ring (612), wherein the cross section of the second inner ring (613) is a V-shape open toward the second pressing ring (612), and the plurality of second inner rings (613) are stacked in sequence along the direction toward the second pressing ring (612), and a recess matching the shape of the second inner ring (613) is provided on one side of the second supporting ring (611) close to the second inner ring (613), and a protrusion matching the shape of the second inner ring (613) is provided on one side of the second pressing ring (612) close to the second inner ring (613).

10. The hydraulic cylinder of a press machine according to claim 5, characterized in that: The guide ring (31) and the guide sleeve (62) are made of copper alloy.

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