Hydraulic cylinder assembly

Abstract

The utility model discloses a hydraulic cylinder assembly which comprises a cylinder barrel internally provided with a cavity penetrating in the axial direction of the cylinder barrel, end covers are packaged at the two ends of the cylinder barrel respectively, the inner walls of the two end covers are matched with an inner cavity of the cylinder barrel to define a piston cavity capable of containing hydraulic oil, and a piston rod is inserted in one end cover. The inner end part of the piston rod can be inserted into the piston cavity in a reciprocating motion manner along the axial direction; an end plate extending in the radial direction of the cylinder barrel is arranged at the end of the cylinder barrel, an alignment protection plate extending in the radial direction of the end cover is arranged on the periphery of the end cover, the inner end face of the alignment protection plate and the outer end face of the end plate are aligned and pressed in a one-to-one correspondence mode in the axial direction of the cylinder barrel, and an end face sealing ring coaxially matched with the cylinder barrel is embedded between the inner end face of the alignment protection plate and the outer end face of the end plate. The sealing ring of the hydraulic cylinder assembly is not prone to abrasion, so that the sealing structure of the hydraulic cylinder assembly is stable and reliable, the sealing effect is good, and the phenomenon of oil leakage at the end of the cylinder barrel can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of assembly sealing structures of hydraulic cylinder components, and particularly relates to a hydraulic cylinder assembly. Background Art

[0002] A hydraulic cylinder is a very common actuating mechanism in the mechanical field. Its power output is stable and reliable, and it can meet the application requirements under a variety of different working conditions. The structural sealing performance of the hydraulic cylinder directly affects its working performance and service life.

[0003] At present, in the industry, the commonly used hydraulic cylinders usually use O-ring seals as sealing elements to complete the corresponding component sealing assembly. Specifically, when the end caps at both ends of the cylinder barrel are assembled in alignment with the cylinder barrel body, part of the structure at the inner end of the end cap is inserted into the barrel openings at both ends of the cylinder barrel.

[0004] Correspondingly, an O-ring seal is installed between the outer wall of the part of the end cap inserted into the cylinder barrel and the inner wall of the barrel opening of the cylinder barrel to seal the inner cavity end of the cylinder barrel, so as to prevent liquids such as pressure oil in the inner cavity of the cylinder barrel from overflowing or leaking out through the joint between the cylinder barrel end and the end cap, avoid the phenomenon of oil leakage during the operation of the hydraulic cylinder, and also prevent external dust or other impurities from entering the inner cavity of the cylinder barrel through the joint between the cylinder barrel and the end cap, thereby contaminating the oil in the hydraulic cylinder. Thus, the O-ring seal is used to seal the end fitting structure of the hydraulic cylinder to ensure the stable oil pressure and pure oil of the hydraulic cylinder, and accordingly ensure the working stability and service life of the hydraulic cylinder.

[0005] However, as mentioned above, in the existing conventional hydraulic cylinder structure, usually only an O-ring seal is installed between the outer peripheral surface of the end cap and the inner peripheral wall of the cylinder barrel as the end sealing structure of the inner cavity of the hydraulic cylinder. However, during actual assembly operation, when the end cap is assembled in alignment with the cylinder barrel end, the insertion end of the end cap needs to be pressed into the barrel opening of the cylinder barrel, which will cause serious extrusion and friction to the O-ring seal located there. In actual application, this operation process is extremely likely to cause the O-ring seal to be strongly extruded and rubbed to cause wear, resulting in poor sealing effect at the corresponding position, and even causing the sealing structure to fail, which will directly lead to oil leakage or even leakage at the joint between the cylinder barrel and the end cap during the operation of the hydraulic cylinder, posing a safety hazard to the operation of hydraulic cylinder-related equipment, increasing the risk of equipment accidents, and having an adverse impact on the reliable and continuous operation of the hydraulic cylinder.

[0006] In view of this, how to optimize the sealing structure at the end of the hydraulic cylinder, improve its end sealing effect, and avoid oil leakage at the cylinder barrel end is an important technical problem that those skilled in the art need to solve at present. Summary of the Utility Model

[0007] The utility model aims to provide a hydraulic cylinder assembly, the sealing ring of which is not easy to wear, so that the sealing structure is stable and reliable, the sealing effect is good, and the oil leakage at the end of the cylinder barrel can be effectively avoided.

[0008] In order to solve the above technical problems, the utility model provides a hydraulic cylinder assembly, including a cylinder having a cavity penetrating along its axial direction, end covers are respectively enclosed at both ends of the cylinder, the inner walls of the two end covers are adapted to the inner cavity of the cylinder to enclose a piston cavity capable of containing hydraulic oil, a piston rod is inserted on one of the end covers, and the inner end of the piston rod can be inserted into the piston cavity in an axially reciprocating manner;

[0009] The end of the cylinder has an end plate extending radially thereof, and the outer peripheral portion of the end cover has an alignment guard plate extending radially thereof, the inner end face of the alignment guard plate and the outer end face of the end plate are aligned and pressed one by one along the axial direction of the cylinder, and an end face sealing ring coaxially matched with the cylinder is embedded between the inner end face of the alignment guard plate and the outer end face of the end plate.

[0010] Preferably, a sealing boss is protruding from the middle part of the end cover on one end face facing the cylinder, and the sealing boss is inserted into the cylinder along the axial direction of the cylinder, the outer circumferential surface of the sealing boss and the inner circumferential surface of the cylinder are aligned and pressed along the radial direction of the cylinder, and a circumferential sealing ring coaxially matched with the cylinder is embedded between the outer circumferential surface of the sealing boss and the inner circumferential surface of the cylinder.

[0011] Preferably, at least one of the outer circumferential surface of the sealing boss and the inner circumferential surface of the cylinder is recessed with a circumferential sealing groove extending along the circumference of the cylinder and connected end to end, the circumferential sealing ring is aligned and embedded in the circumferential sealing groove, and the thickness of the circumferential sealing ring along the radial direction of the cylinder is greater than the depth of the circumferential sealing groove along the radial direction of the cylinder.

[0012] Preferably, there are at least two end face sealing rings located at the same end of the cylinder, and the diameters of the end face sealing rings located at the same end of the cylinder are not equal.

[0013] Preferably, the alignment guard plate and the end plate are aligned, assembled and tightened by fastening bolts.

[0014] Preferably, there are at least two fastening bolts located at the same end of the cylinder, and the fastening bolts located at the same end of the cylinder are evenly spaced along the circumference of the cylinder.

[0015] Preferably, the distance between the end face sealing ring and the axis of the cylinder is smaller than the distance between the fastening bolt and the axis of the cylinder.

[0016] Preferably, at least one of the inner end face of the alignment guard plate and the outer end face of the end plate is recessed with an end face seal groove extending circumferentially along the cylinder barrel and connected end to end. The end face seal ring is fitted into the end face seal groove in alignment, and the thickness of the end face seal ring along the axial direction of the cylinder barrel is greater than the depth of the end face seal groove along the axial direction of the cylinder barrel.

[0017] Preferably, the end face seal ring is an O-ring.

[0018] Preferably, the end face seal ring is a rubber part or a silica gel part.

[0019] Compared with the above background art, in the process of assembly and application of the hydraulic cylinder assembly provided by the present invention, since an end face seal ring is fitted between the inner end face of the alignment guard plate and the outer end face of the end plate, after the end cover and the alignment components of the cylinder barrel are assembled in place by applying a force along the axial direction of the cylinder barrel, through the relative force of mutual clamping along the axial direction of the cylinder barrel between the alignment guard plate and the end plate, the end face seal ring can be reliably pressed and fixed between the inner end face of the alignment guard plate and the outer end face of the end plate, so that the end face seal ring that is elastically deformed moderately after being pressed can form a reliable structural seal between the inner end face of the alignment guard plate and the outer end face of the end plate, thereby forming a stable circumferential structural seal for the outer periphery of the end opening of the cylinder barrel, effectively isolating the piston cavity space inside the end face seal ring from the external space of the hydraulic cylinder assembly outside the end face seal ring, avoiding the phenomenon of hydraulic oil in the piston cavity overflowing and seeping out through the joint between the end cover and the end of the cylinder barrel, and also correspondingly avoiding the situation that dust or other impurities in the external environment enter the internal space of the piston cavity through the joint between the end of the cylinder barrel and the end cover and contaminate the hydraulic oil; during the equipment assembly process, since the end face seal ring is only subjected to the pressing force applied along the axial direction of the cylinder barrel by the inner end face of the alignment guard plate and the outer end face of the end plate, and there is no relative movement along the radial direction of the cylinder barrel between the inner end face of the alignment guard plate and the outer end face of the end plate, the end face seal ring will not be subjected to radial extrusion and rubbing friction along the cylinder barrel, thus effectively avoiding the structural damage of the end face seal ring caused by the lateral force and impact force along the radial direction of the cylinder barrel, ensuring the structural integrity of the end face seal ring, and correspondingly ensuring the sealing structure stability of the end face seal ring. Therefore, the hydraulic cylinder assembly integrated with the end face seal ring can effectively ensure the stable and reliable sealing structure at the end of its cylinder barrel, ensure the stable oil pressure of the internal hydraulic oil, and correspondingly ensure the reliable movement of the piston rod, thereby making the overall assembly structure stability and working reliability of the hydraulic cylinder assembly, and making the hydraulic cylinder assembly not prone to oil leakage at the end of the cylinder barrel during operation.

[0020] In another preferred embodiment of the present utility model, a sealing plug boss is protrudingly provided on one end face of the middle part of the end cover facing the cylinder barrel. The sealing plug boss is inserted into the cylinder barrel along the axial direction of the cylinder barrel. The outer peripheral surface of the sealing plug boss is pressed against the inner peripheral surface of the cylinder barrel in the radial direction of the cylinder barrel, and a circumferential sealing ring adapted to be coaxially fitted with the cylinder barrel is embedded between the outer peripheral surface of the sealing plug boss and the inner peripheral surface of the cylinder barrel. After the equipment is assembled in place, the sealing plug boss is inserted into the mouth of the cylinder barrel. Thus, the circumferential sealing ring can be reliably pressed by the cooperative acting force in the radial direction of the cylinder barrel between the outer peripheral surface of the sealing plug boss and the inner peripheral surface of the mouth of the cylinder barrel, so that the circumferential sealing ring can form a reliable structural seal for the piston cavity along the circumferential direction of the cylinder barrel. Correspondingly, a secondary sealing structure for the piston cavity space can be formed by the cooperative action of the circumferential sealing ring and the end face sealing ring, thereby further improving the relative sealing effect between the piston cavity and the external space, and further preventing the occurrence of internal oil leakage and external impurity entry into the piston cavity of the hydraulic cylinder assembly, ensuring the stable assembly and reliable operation of the hydraulic cylinder assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 FIG. is a structural sectional view of a hydraulic cylinder assembly provided by a specific embodiment of the present utility model.

[0023] Wherein:

[0024] 11 - cylinder barrel; 111 - piston cavity; 112 - end plate;

[0025] 12 - end cover; 121 - alignment guard plate; 122 - piston hole; 123 - sealing plug boss;

[0026] 13 - piston rod;

[0027] 14 - end face sealing ring; 141 - end face sealing groove;

[0028] 15 - circumferential sealing ring; 151 - circumferential sealing groove;

[0029] 16 - fastening bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The core of the present utility model is to provide a hydraulic cylinder assembly. The sealing ring of this hydraulic cylinder assembly is not prone to wear, so its sealing structure is stable and reliable, the sealing effect is good, and it can effectively avoid the phenomenon of oil leakage at the end of the cylinder barrel.

[0031] In order to enable those skilled in the art to better understand the solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] It should be noted in advance that in the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and other terms 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] In addition, in the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them.

[0034] In addition to this, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature. The orientation or positional relationship indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing 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 therefore cannot be understood as a limitation to the present utility model.

[0035] Please refer to Figure 1 。

[0036] In the specific embodiment, the hydraulic cylinder assembly provided by the present utility model includes a cylinder barrel 11 with a cavity axially penetrating through it. End caps 12 are respectively encapsulated at both ends of the cylinder barrel 11. The inner walls of the two end caps 12 are adapted to the inner cavity of the cylinder barrel 11 to enclose a piston cavity 111 capable of accommodating hydraulic oil. A piston rod 13 is inserted into one of the end caps 12, and the inner end of the piston rod 13 can be inserted into the piston cavity 111 and reciprocate axially.

[0037] On this basis, the end of the cylinder barrel 11 has an end plate 112 extending radially along it, and the outer peripheral part of the end cover 12 has a positioning guard plate 121 extending radially along it. The inner end face of the positioning guard plate 121 and the outer end face of the end plate 112 are pressed against each other in one-to-one correspondence along the axial direction of the cylinder barrel 11, and an end face sealing ring 14 adapted to be coaxially fitted with the cylinder barrel 11 is embedded between the inner end face of the positioning guard plate 121 and the outer end face of the end plate 112.

[0038] In the specific assembly and application process, since the end face sealing ring 14 is embedded between the inner end face of the positioning guard plate 121 and the outer end face of the end plate 112, after the end cover 12 and the respective positioning components of the cylinder barrel 11 are assembled in place by applying a force along the axial direction of the cylinder barrel 11, through the relative acting force of the positioning guard plate 121 and the end plate 112 being clamped together along the axial direction of the cylinder barrel 11, the end face sealing ring 14 can be reliably pressed and fixed between the inner end face of the positioning guard plate 121 and the outer end face of the end plate 112, so that the end face sealing ring 14 with appropriate elastic deformation after being pressed can form a reliable structural seal between the inner end face of the positioning guard plate 121 and the outer end face of the end plate 112, thereby forming a stable circumferential structural seal for the outer peripheral part at the end opening of the cylinder barrel 11. Thus, the piston cavity 111 space inside the end face sealing ring 14 and the external space of the hydraulic cylinder assembly outside the end face sealing ring 14 are effectively isolated, avoiding the phenomenon of hydraulic oil in the piston cavity 111 overflowing and seeping out through the mating part between the end cover 12 and the end of the cylinder barrel 11, and also correspondingly avoiding the situation where dust or other impurities in the external environment enter the internal space of the piston cavity 111 through the mating part between the end of the cylinder barrel 11 and the end cover 12 and contaminate the hydraulic oil.

[0039] During the equipment assembly process, since the end face sealing ring 14 only receives the pressing force applied along the axial direction of the cylinder barrel 11 by the inner end face of the positioning guard plate 121 and the outer end face of the end plate 112, and there is no relative movement along the radial direction of the cylinder barrel 11 between the inner end face of the positioning guard plate 121 and the outer end face of the end plate 112, the end face sealing ring 14 will not be subjected to radial extrusion and rubbing friction along the cylinder barrel 11, thus effectively avoiding the structural damage of the end face sealing ring 14 caused by the lateral acting force and impact force along the radial direction of the cylinder barrel 11, ensuring the structural integrity of the end face sealing ring 14, and correspondingly ensuring the sealing structure stability of the end face sealing ring 14.

[0040] Thus, the hydraulic cylinder assembly integrated with the end face sealing ring 14 can effectively ensure the stable and reliable sealing structure at the end of its cylinder barrel 11, ensure the stable oil pressure of the hydraulic oil inside it, and correspondingly ensure the reliable movement of the piston rod 13. Therefore, the overall assembly structure stability and working reliability of the hydraulic cylinder assembly are improved, and the phenomenon of oil leakage at the end of the cylinder barrel 11 is not likely to occur during the operation of the hydraulic cylinder assembly.

[0041] Generally, a sealing ring that can fit and match with the inner peripheral surface of the cylinder barrel 11 is also tightly sleeved on the outer peripheral surface of the inner end portion of the piston rod 13, so as to ensure the sealing effect of the outer edge portion of the oil flow space on both axial sides of the inner end portion of the piston rod 13 in the piston chamber 111, and ensure the operating efficiency of the piston rod 13 and the reliable operation of the entire hydraulic cylinder assembly.

[0042] In addition, a sealing ring is also installed between the outer peripheral surface of the main structure of the piston rod 13 inserted in the middle of the end cover 12 and the inner peripheral surface of the piston hole 122 in the middle of the end cover 12 through which the piston rod 13 passes, so as to ensure the sealing effect of the mating surface between the piston rod 13 and the piston hole 122 in the middle of the end cover 12, prevent the oil in the piston chamber 111 from leaking out through the mating portion of the piston rod 13 and the piston hole 122, and prevent impurities in the external environment from entering the piston chamber 111 through the mating portion of the piston rod 13 and the piston hole 122 and contaminating the oil, thereby further ensuring the structural sealing effect and working reliability of the hydraulic cylinder assembly.

[0043] Specifically, a blocking boss 123 is convexly provided on the end face of the middle part of the end cover 12 facing the cylinder barrel 11. The blocking boss 123 is inserted into the cylinder barrel 11 along the axial direction of the cylinder barrel 11. The outer peripheral surface of the blocking boss 123 is pressed against the inner peripheral surface of the cylinder barrel 11 in the radial direction of the cylinder barrel 11, and a circumferential sealing ring 15 that is coaxially adapted to the cylinder barrel 11 is installed between the outer peripheral surface of the blocking boss 123 and the inner peripheral surface of the cylinder barrel 11.

[0044] After the equipment is assembled in place, the blocking boss 123 is inserted into the barrel opening of the cylinder barrel 11. Therefore, the circumferential sealing ring can be reliably pressed by the mating force between the outer peripheral surface of the blocking boss 123 and the inner peripheral surface of the barrel opening of the cylinder barrel 11 in the radial direction of the cylinder barrel 11, so that the circumferential sealing ring can form a reliable structural seal for the piston chamber 111 along the circumferential direction of the cylinder barrel 11.

[0045] Correspondingly, the circumferential sealing ring 15 and the end face sealing ring 14 can be used in a coordinated manner to form a secondary sealing structure for the space of the piston chamber 111, thereby further improving the relative sealing effect between the piston chamber 111 and the external space, and further preventing the internal oil of the hydraulic cylinder assembly from leaking out and external impurities from entering the piston chamber 111, etc., and ensuring the stable assembly and reliable operation of the hydraulic cylinder assembly.

[0046] More specifically, at least one of the outer peripheral surface of the blocking boss 123 and the inner peripheral surface of the cylinder barrel 11 is recessed with a circumferential sealing groove 151 that extends circumferentially along the cylinder barrel 11 and is connected end to end. The circumferential sealing ring 15 is inserted into the circumferential sealing groove 151 in a corresponding manner, and the thickness of the circumferential sealing ring 15 in the radial direction of the cylinder barrel 11 is greater than the depth of the circumferential sealing groove 151 in the radial direction of the cylinder barrel 11.

[0047] The circumferential sealing groove 151 can provide a suitable assembly space for the circumferential sealing ring 15, and after the circumferential sealing ring 15 is aligned and embedded in the circumferential sealing groove 151, a reliable limit can be formed for the circumferential sealing ring 15 along the axial direction of the cylinder 11, so that after the equipment is assembled and during the operation of the equipment, the circumferential sealing ring 15 can be effectively prevented from moving along the axial direction of the cylinder 11 and becoming loose or misaligned, thereby ensuring the sealing effect of the circumferential sealing ring 15.

[0048] Correspondingly, making the radial thickness of the circumferential sealing ring 15 greater than or equal to the radial depth of the circumferential sealing groove 151 can ensure that the outer circumferential surface of the circumferential sealing ring 15 can protrude from the notch of the circumferential sealing groove 151, thereby ensuring that the circumferential sealing ring 15 can be reliably pressed against the inner circumferential surface of the cylinder 11 and the outer circumferential surface of the sealing boss 123, thereby ensuring the corresponding sealing effect.

[0049] It is not difficult to understand that, considering the assembly difficulty and arrangement effect in actual application, the circumferential sealing groove 151 is generally arranged on the blocking boss 123 to avoid adverse effects on the main structure of the cylinder 11 due to processing of the groove structure, thereby ensuring the structural strength of the core component of the cylinder 11.

[0050] Similarly, at least one of the inner end surface of the alignment guard plate 121 and the outer end surface of the end plate 112 is recessed with an end face sealing groove 141 extending along the circumference of the cylinder barrel 11 and connected end to end. The end face sealing ring 14 is aligned and embedded in the end face sealing groove 141, and the thickness of the end face sealing ring 14 along the axial direction of the cylinder barrel 11 is greater than the depth of the end face sealing groove 141 along the axial direction of the cylinder barrel 11.

[0051] The end face sealing groove 141 can provide a suitable assembly space for the end face sealing ring 14, and after the end face sealing ring 14 is aligned and embedded in the end face sealing groove 141, the end face sealing ring 14 can be reliably limited along the radial direction of the cylinder 11, so that after the equipment is assembled and during the operation of the equipment, the end face sealing ring 14 can be effectively prevented from moving radially along the cylinder 11 and becoming loose or misaligned, thereby ensuring the sealing effect of the end face sealing ring 14.

[0052] Correspondingly, making the axial thickness of the end face sealing ring 14 greater than or equal to the axial depth of the end face sealing groove 141 can ensure that the axial end face of the end face sealing ring 14 can protrude from the notch of the circumferential surface sealing groove 151, thereby ensuring that the end face sealing ring 14 can be reliably pressed against the inner end face of the positioning guard plate 121 and the outer end face of the end plate 112, thereby ensuring the corresponding sealing effect.

[0053] It should be noted that considering the assembly difficulty and layout effect in actual applications, the end face seal groove 141 is generally arranged on the alignment guard plate 121 to avoid adversely affecting the main structure of the cylinder barrel 11 due to the machining of the groove structure and ensure the structural strength of the core component, i.e., the cylinder barrel 11.

[0054] In addition, there are at least two end face sealing rings 14 at the same end of the cylinder barrel 11, and the diameters of the end face sealing rings 14 at the same end of the cylinder barrel 11 are not equal. Arranging two or more end face sealing rings 14 at the same end of the cylinder barrel 11 can utilize the cooperative cooperation of the end face sealing rings 14 to further strengthen the sealing structure between the outer end face of the end plate 112 and the inner end face of the alignment guard plate 121, thereby making the structural sealing effect at the end of the cylinder barrel 11 better.

[0055] Arranging the end face sealing rings 14 at the same end as a non-equal-diameter mating structure can avoid the overlap of the end face sealing rings 14 and correspondingly improve the cooperative cooperation effect and effective sealing area of the end face sealing rings 14, thereby further optimizing the layout of the sealing structure.

[0056] On the other hand, the alignment guard plate 121 and the end plate 112 are assembled and pressed in place through fastening bolts 16. The structure of the fastening bolts 16 is simple and reliable, and the corresponding threaded fastening structure is relatively easy to disassemble and assemble, which can further improve the convenience of disassembling and assembling the alignment guard plate 121 and the end plate 112, so that when the end of the cylinder barrel 11 or the end plate 112 needs to be repaired, maintained or replaced, it can be conveniently disassembled and reassembled, making the use and maintenance of the hydraulic cylinder assembly more convenient and efficient.

[0057] In actual applications, the fastening bolts 16 can pass through the clearance holes on the alignment guard plate 121 and be threadedly connected to the threaded holes on the end plate 112, or can pass through the clearance holes on the end plate 112 and be threadedly connected to the threaded holes on the alignment guard plate 121, or can also pass through the clearance holes respectively located on the end plate 112 and the alignment guard plate 121 and be threadedly connected to the fastening nuts on the other side to clamp the alignment guard plate 121 and the end plate 112 between the nuts of the fastening bolts 16 and the fastening nuts.

[0058] Of course, in actual operation, the assembly structure between the alignment guard plate 121 and the end plate 112 is not limited to the fastening bolts 16 described above, and the appropriate assembly form can also be flexibly selected and adjusted according to the actual working conditions. In principle, as long as it can ensure the reliable axial connection and pressing of the alignment guard plate 121 and the end plate 112 and meet the actual application requirements of the hydraulic cylinder assembly, it is acceptable.

[0059] Further, there are at least two fastening bolts 16 at the same end of the cylinder barrel 11, and the fastening bolts 16 at the same end of the cylinder barrel 11 are evenly distributed at equal intervals along the circumferential direction of the cylinder barrel 11. Arranging a plurality of fastening bolts 16 evenly at equal intervals along the circumferential direction of the cylinder barrel 11 helps to optimize the stress distribution at the end of the cylinder barrel 11 and avoid structural damage caused by local stress concentration of the alignment guard plate 121 and the end plate 112, thereby further optimizing the structural strength and assembly reliability of the hydraulic cylinder assembly.

[0060] On this basis, the distance between the end face seal ring 14 and the axis of the cylinder barrel 11 is less than the distance between the fastening bolt 16 and the axis of the cylinder barrel 11. That is, with the radial direction of the cylinder barrel 11 as the reference direction, the end face seal ring 14 is located inside the circumferentially arranged fastening bolts 16. In this way, the end face seal ring 14 is arranged in a region closer to the mouth of the cylinder barrel 11, ensuring the corresponding sealing effect and effectively avoiding structural interference and adverse effects between the end face seal ring 14 and the fastening bolt 16.

[0061] In practical applications, the end face seal ring 14 is preferably an O-ring, and the circumferential seal ring 15 is also preferably an O-ring. The O-ring has a simple and reliable structure and good structural adaptability to components such as the cylinder barrel 11 and the end cover 12, and can fully meet the assembly application requirements of the hydraulic cylinder assembly.

[0062] Of course, the end face seal ring 14 and the circumferential seal ring 15 can also be U-rings or other types of seal rings to match the assembly application requirements under different working conditions.

[0063] In addition, the end face seal ring 14 is usually selected as a rubber seal ring or a silica gel seal ring, or a plastic seal ring can also be selected, and the material of the circumferential seal ring 15 can also be selected correspondingly. Generally, the seal rings used in this solution should ensure basic structural flexibility and pressing and fitting ability to meet the corresponding structural sealing requirements and ensure the sealing performance of the hydraulic cylinder assembly.

[0064] In summary, in the hydraulic cylinder assembly provided in the present utility model, during its assembly and application process, since an end face sealing ring is installed between the inner end face of the alignment guard plate and the outer end face of the end plate, after the end cover and each alignment component of the cylinder barrel are assembled in place by applying a force along the axial direction of the cylinder barrel, through the relative force of mutual clamping along the axial direction of the cylinder barrel between the alignment guard plate and the end plate, the end face sealing ring can be reliably pressed and fixed between the inner end face of the alignment guard plate and the outer end face of the end plate. Thus, the end face sealing ring that undergoes appropriate elastic deformation under pressure can form a reliable structural seal between the inner end face of the alignment guard plate and the outer end face of the end plate, thereby forming a stable circumferential structural seal for the outer periphery of the cylinder barrel end opening, effectively isolating the piston cavity space inside the end face sealing ring from the external space of the hydraulic cylinder assembly outside the end face sealing ring, avoiding the phenomenon of hydraulic oil in the piston cavity overflowing and seeping out through the joint between the end cover and the cylinder barrel end, and also correspondingly avoiding the situation where dust or other impurities in the external environment enter the piston cavity internal space through the joint between the cylinder barrel end and the end cover and contaminate the hydraulic oil; during the equipment assembly process, since the end face sealing ring only receives the pressing force applied along the axial direction of the cylinder barrel by the inner end face of the alignment guard plate and the outer end face of the end plate, and there is no relative movement along the radial direction of the cylinder barrel between the inner end face of the alignment guard plate and the outer end face of the end plate, the end face sealing ring will not be subjected to extrusion, rubbing, and friction along the radial direction of the cylinder barrel. Thus, it effectively avoids the structural damage of the end face sealing ring caused by the lateral force and impact force along the radial direction of the cylinder barrel, ensures the structural integrity of the end face sealing ring, and correspondingly ensures the sealing structure stability of the end face sealing ring. Therefore, the hydraulic cylinder assembly integrated with the end face sealing ring can effectively ensure the stable and reliable sealing structure at the end of its cylinder barrel, ensure the stable oil pressure of the internal hydraulic oil, and correspondingly ensure the reliable movement of the piston rod. Thus, the overall assembly structure stability and working reliability of the hydraulic cylinder assembly are improved, and it is not easy to occur the phenomenon of oil leakage at the end of the cylinder barrel during the operation of the hydraulic cylinder assembly.

[0065] The above has introduced the hydraulic cylinder assembly provided by the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A hydraulic cylinder assembly, characterized in that, It includes a cylinder barrel with a cavity penetrating axially therein. End covers are respectively encapsulated at both ends of the cylinder barrel. The inner walls of the two end covers are adapted to the inner cavity of the cylinder barrel to enclose a piston cavity capable of accommodating hydraulic oil. A piston rod is inserted on one of the end covers, and the inner end of the piston rod is inserted into the piston cavity in a reciprocating manner along the axial direction. The end of the cylinder barrel has an end plate extending radially along it. The outer peripheral part of the end cover has a positioning guard plate extending radially along it. The inner end face of the positioning guard plate and the outer end face of the end plate are pressed against each other in one-to-one correspondence along the axial direction of the cylinder barrel, and an end face sealing ring coaxially adapted to the cylinder barrel is embedded between the inner end face of the positioning guard plate and the outer end face of the end plate.

2. The hydraulic cylinder assembly according to claim 1, wherein, A blocking boss is convexly provided on the side end face of the middle part of the end cover facing the cylinder barrel. The blocking boss is inserted into the cylinder barrel along the axial direction of the cylinder barrel. The outer peripheral surface of the blocking boss and the inner peripheral surface of the cylinder barrel are pressed against each other in one-to-one correspondence along the radial direction of the cylinder barrel, and a circumferential sealing ring coaxially adapted to the cylinder barrel is embedded between the outer peripheral surface of the blocking boss and the inner peripheral surface of the cylinder barrel.

3. The hydraulic cylinder assembly according to claim 2, characterized in that, At least one of the outer peripheral surface of the blocking boss and the inner peripheral surface of the cylinder barrel is recessed with a circumferential sealing groove extending circumferentially along the cylinder barrel and connected end to end. The circumferential sealing ring is inserted into the circumferential sealing groove in a one-to-one correspondence manner, and the thickness of the circumferential sealing ring along the radial direction of the cylinder barrel is greater than the depth of the circumferential sealing groove along the radial direction of the cylinder barrel.

4. The hydraulic cylinder assembly according to claim 1, characterized in that, There are at least 2 end face sealing rings at the same end of the cylinder barrel, and the diameters of the end face sealing rings at the same end of the cylinder barrel are not equal.

5. The hydraulic cylinder assembly according to claim 1, wherein, The positioning guard plate and the end plate are assembled and pressed against each other through fastening bolts in a one-to-one correspondence manner.

6. The hydraulic cylinder assembly according to claim 5, characterized in that, There are at least 2 fastening bolts at the same end of the cylinder barrel, and the fastening bolts at the same end of the cylinder barrel are evenly distributed at equal intervals along the circumferential direction of the cylinder barrel.

7. The hydraulic cylinder assembly according to claim 6, characterized in that, The distance between the end face sealing ring and the axis of the cylinder barrel is less than the distance between the fastening bolt and the axis of the cylinder barrel.

8. The hydraulic cylinder assembly according to claim 1, wherein, At least one of the inner end face of the positioning guard plate and the outer end face of the end plate is recessed with an end face sealing groove extending circumferentially along the cylinder barrel and connected end to end. The end face sealing ring is inserted into the end face sealing groove in a one-to-one correspondence manner, and the thickness of the end face sealing ring along the axial direction of the cylinder barrel is greater than the depth of the end face sealing groove along the axial direction of the cylinder barrel.

9. The hydraulic cylinder assembly according to claim 1, wherein The end face sealing ring is an O-ring.

10. The hydraulic cylinder assembly according to claim 1, characterized in that, The end face sealing ring is a rubber part or a silica gel part.

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