Oil cylinder sealing system

Abstract

The utility model provides an oil cylinder sealing system, which relates to the technical field of oil cylinder sealing, and comprises a cylinder barrel, a guide sleeve, a piston rod, a dustproof ring, an antifouling ring, a first support ring and a second support ring, one end of the guide sleeve extends out of the cylinder barrel and extends outwards in the radial direction of the guide sleeve to form an annular connecting plate, the annular connecting plate is fixedly connected with the open end of the cylinder barrel through bolts, and a first annular groove, a second annular groove and a third annular groove are sequentially formed in the end, close to the annular connecting plate, of the inner wall of the guide sleeve at intervals. A dustproof ring is arranged in the first annular groove, the inner wall of the dustproof ring abuts against the outer wall of the piston rod, an antifouling ring is arranged in the second annular groove, a first supporting ring is arranged in the third annular groove, a fourth annular groove is formed in the end, away from the annular connecting plate, of the inner wall of the guide sleeve, and a second supporting ring is arranged in the fourth annular groove. The sealing performance of the oil cylinder can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil cylinder sealing technical field, specifically, relate to an oil cylinder sealing system. BACKGROUND

[0002] In modern mining transportation, the mine dump truck as an important transport tool, its performance directly affects the transportation efficiency and safety of the ore. Among them, the suspension oil cylinder as one of the key components, plays a vital role for the stability, carrying capacity and operation comfort of the dump truck.

[0003] Usually, the suspension oil cylinder is composed of cylinder body, piston, sealing element and oil pipe, etc., its main function is to realize high frequency reciprocating action through the pressure of hydraulic oil, to meet the requirements of equipment on movement precision and efficiency. However, with long time friction and pressure change will make the sealing material gradually wear, leading to the influence of sealing performance. CONTENT

[0004] The utility model solves the problem of how to improve the sealing of the oil cylinder.

[0005] To solve the above problems, the utility model provides an oil cylinder sealing system.

[0006] Firstly, the utility model provides an instrument board crossbeam assembly, which comprises a cylinder barrel, a guide sleeve, a piston rod, a dustproof ring, an antifouling ring, a first supporting ring and a second supporting ring, the guide sleeve is arranged in the cylinder barrel, the piston rod is arranged in the guide sleeve, one end of the guide sleeve extends out of the open end of the cylinder barrel and extends out of an annular connecting plate along the radial direction of the cylinder barrel, the annular connecting plate and the open end of the cylinder barrel are fixedly connected through bolts, the inner wall of the guide sleeve is sequentially and spacedly provided with a first annular groove, a second annular groove and a third annular groove at one end close to the annular connecting plate, the dustproof ring is arranged in the first annular groove, the inner wall of the dustproof ring abuts against the outer wall of the piston rod, the antifouling ring is arranged in the second annular groove, the inner wall of the antifouling ring abuts against the outer wall of the piston rod, the first supporting ring is arranged in the third annular groove, the inner wall of the first supporting ring is arranged to be higher than the inner wall of the guide sleeve and abuts against the outer wall of the piston rod, the inner wall of the guide sleeve is provided with a fourth annular groove at one end away from the annular connecting plate, the second supporting ring is arranged in the fourth annular groove, the inner wall of the second supporting ring is arranged to be higher than the inner wall of the guide sleeve and abuts against the outer wall of the piston rod, the height of the inner wall of the first supporting ring higher than the inner wall of the guide sleeve is consistent with the height of the inner wall of the second supporting ring higher than the inner wall of the guide sleeve.

[0007] Optionally, the system further comprises a lubricating oil path, the lubricating oil path comprising a fifth annular groove arranged on the middle part of the outer wall of the guide sleeve and a sixth annular groove arranged on the middle part of the inner wall of the guide sleeve, a through hole of the guide sleeve communicating with the fifth annular groove and the sixth annular groove, and an oil injection hole arranged on the cylinder barrel, the position of the oil injection hole matching the position of the fifth annular groove.

[0008] Optionally, the lubricating oil path further comprises an oil discharge hole arranged on the cylinder barrel and symmetrically arranged with the oil injection hole, the oil injection hole and the oil discharge hole respectively communicating with the fifth annular groove.

[0009] Optionally, the system further comprises a first sealing ring, a seventh annular groove is arranged on the outer wall of the guide sleeve close to one end of the annular connecting plate, the first sealing ring is arranged in the seventh annular groove, and the outer wall of the first sealing ring abuts against the inner wall of the cylinder barrel.

[0010] Optionally, the system further comprises a second sealing ring and a first blocking ring, an eighth annular groove is arranged on the outer wall of the guide sleeve away from one end of the annular connecting plate, the second sealing ring and the first blocking ring are arranged in the eighth annular groove, the second sealing ring and the first blocking ring abut against each other, and the outer wall of the second sealing ring abuts against the inner wall of the cylinder barrel.

[0011] Optionally, the system further comprises a third sealing ring and a second blocking ring, a ninth annular groove is arranged on the outer wall of the guide sleeve close to one end of the eighth annular groove, the third sealing ring and the second blocking ring are arranged in the ninth annular groove, the third sealing ring and the second blocking ring abut against each other, and the outer wall of the third sealing ring abuts against the inner wall of the cylinder barrel.

[0012] Optionally, the system further comprises a St ring, a tenth annular groove is arranged on the inner wall of the guide sleeve close to one end of the fourth annular groove, the St ring is arranged in the tenth annular groove, and the inner wall of the St ring abuts against the outer wall of the piston rod.

[0013] Optionally, the system further comprises a Y-shaped ring, an eleventh annular groove is arranged on the inner wall of the guide sleeve close to one end of the tenth annular groove, the Y-shaped ring is arranged in the eleventh annular groove, and the inner wall of the Y-shaped ring abuts against the outer wall of the piston rod.

[0014] Optionally, the system further comprises a fourth sealing ring, a twelfth annular groove is arranged on the inner wall of the guide sleeve close to one end of the eleventh annular groove, the fourth sealing ring is arranged in the twelfth annular groove, and the inner wall of the fourth sealing ring abuts against the outer wall of the piston rod.

[0015] Optionally, the system further comprises a fifth sealing ring, a thirteenth annular groove is arranged between the inner wall of the guide sleeve and the second annular groove and the third annular groove, and the fifth sealing ring is arranged in the thirteenth annular groove, and the inner wall of the fifth sealing ring is in abutment with the outer wall of the piston rod.

[0016] The oil cylinder sealing system has the following advantages: the dustproof ring is arranged in the first annular groove of the guide sleeve close to one end of the annular connecting plate, and the dustproof ring is in abutment with the piston rod, so that foreign matters can be effectively prevented from entering the cylinder barrel, the pollution of foreign matters to the internal components and hydraulic oil of the oil cylinder can be effectively avoided, and the cleanliness of the oil cylinder is ensured. Meanwhile, the anti-pollution ring in the second annular groove is in abutment with the outer wall of the piston rod, so that the protection capability is further enhanced, foreign matters, such as oil stains, water stains and small metal particles, which cannot be removed by the dustproof ring, can be blocked from entering the oil cylinder, the pollution of these foreign matters to the hydraulic oil and the abrasion of the internal components are avoided, and the service life of the hydraulic oil and the components of the oil cylinder is prolonged. The first support ring and the second support ring arranged at two ends of the guide sleeve support and guide the piston rod penetrating therethrough, the support of the first support ring and the second support ring is like a track, the piston rod is guided to move along the correct axial direction, the piston rod can be prevented from deviating, unnecessary friction and extrusion between the piston rod and the dustproof ring and the anti-pollution ring are avoided, the stability of the functions of the sealing members, such as the dustproof ring and the anti-pollution ring, is ensured, and the sealing effect of the oil cylinder is improved. In addition, the inner walls of the first support ring and the second support ring are arranged to be higher than the inner wall of the guide sleeve, so that the piston rod penetrating through the first support ring and the second support ring has a certain gap with the inner wall of the guide sleeve during reciprocating operation, the piston rod and the inner wall of the guide sleeve are prevented from rubbing against each other and being damaged, and the service life of the oil cylinder is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic view of an oil cylinder sealing system according to an embodiment of the present utility model;

[0018] Figure 2 FIG. 2 is an enlarged schematic view of A shown in FIG. 1. Figure 1

[0019] MARKS:

[0020] ​1-cylinder; 2-guide sleeve; 201-first annular groove; 202-second annular groove; 203-third annular groove; 204-fourth annular groove; 205-seventh annular groove; 206-eighth annular groove; 207-ninth annular groove; 208-tenth annular groove; 209-eleventh annular groove; 210-twelfth annular groove; 211-thirteenth annular groove; 212-dustproof ring; 213-anti-fouling ring; 214-first support ring; 215-second support ring; 216-first sealing ring; 217-second sealing ring; 218-third sealing ring; 219-fourth sealing ring; 220-fifth sealing ring; 221-first blocking ring; 222-second blocking ring; 223-sterile seal; 224-Y-shaped ring; 225-annular connecting plate; 3-piston rod; 4-lubricating oil path; 401-fifth annular groove; 402-sixth annular groove; 403-oil injection hole; 404-oil discharge hole. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings. Although some embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be realized in various forms, and should not be interpreted as being limited to the embodiments described herein, on the contrary, these embodiments are provided to make the utility model more thorough and complete. It should be understood that the drawings and embodiments of the utility model are only for illustrative purposes, and are not used to limit the protection scope of the utility model.

[0022] The term "comprising" and its variants as used herein are open-ended, that is "including but not limited to"; the term "based on" is "at least partially based on"; the term "one 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". Related definitions of other terms will be given in the following description. It should be noted that the "first", "second", etc. concepts mentioned in the utility model are only used to distinguish different devices, modules or units, and are not used to limit the functions performed by these devices, modules or units or their mutual dependence.

[0023] It should be noted that the modification of "one" or "multiple" mentioned in the utility model is illustrative and not limiting, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0024] In the related art, the oil cylinder is mainly composed of a cylinder 1, a piston, a piston rod 3 and the like. The cylinder 1 is usually a cylindrical shell, which provides a space for the piston and the oil. The piston is installed inside the cylinder 1, which divides the cylinder 1 into two chambers and can move reciprocally in the cylinder 1. The piston rod 3 is connected to the piston at one end and extends out of the cylinder 1 at the other end, which is used to transmit force and displacement. Taking a suspension cylinder of a dumper as an example, when the dumper carriage needs to be lifted, the hydraulic oil enters the chamber below the piston (assuming that the chamber below the piston is a lifting chamber) through the oil inlet, and under the action of the pressure difference, the piston moves upward, the upward movement of the piston drives the piston rod 3 to extend, and then the dumper carriage is lifted. For example, in a self-dumper used in a mine, when the mine needs to be unloaded, the hydraulic system is started, the hydraulic oil enters the lifting chamber of the suspension cylinder, pushes the piston and the piston rod 3, and tilts the carriage, which facilitates the dumping of the mine. When the dumper carriage needs to be lowered, the flow direction of the hydraulic oil changes, at this time, the hydraulic oil in the lifting chamber flows out through the oil outlet, and the hydraulic oil in the return oil chamber may be higher than the lifting chamber (achieved by controlling the valve in the hydraulic system), under the action of the pressure difference, the piston moves downward, drives the piston rod 3 to retract, and the carriage returns to the initial position. In this process, the hydraulic oil flows back to the oil tank or to the low-pressure area of the hydraulic system, ready for the next lifting operation. However, in the long-term use of the oil cylinder, the frequent reciprocating motion may cause the sealing element to rub against the piston and the piston rod 3 and wear out, the uneven force on the piston rod 3 may also cause partial wear, which may cause the sealing performance to decrease, and at the same time, due to the decrease in sealing performance, impurities such as dust, metal chips and moisture may enter the oil cylinder, which may further accelerate the wear of the components in the oil cylinder and affect the sealing performance of the oil cylinder.

[0025] In view of the problems in the above related art, the utility model provides an oil cylinder sealing system, which can effectively improve the sealing performance of the oil cylinder. The specific embodiments will be described in detail below.

[0026] In combination with 1 and 2, the utility model discloses an oil cylinder sealing system, including cylinder 1, guide sleeve 2, piston rod 3, dustproof ring 212, antifouling ring 213, first support ring 214 and second support ring 215, guide sleeve 2 set in cylinder 1, piston rod 3 is arranged in guide sleeve 2, the open end of cylinder 1 is stretched out to guide sleeve 2 one end and along its radial direction and extends the annular connecting plate 225 outward, the annular connecting plate 225 and the open end of cylinder 1 are fixedly connected by bolt, the inner wall of guide sleeve 2 is close to the end of annular connecting plate 225 and is sequentially spaced first annular groove 201, second annular groove 202 and third annular groove 203, first annular groove 201 is provided with dustproof ring 212, the inner wall of dustproof ring 212 and the outer wall of piston rod 3 abut, second annular groove 202 is provided with antifouling ring 213, the inner wall of antifouling ring 213 and the outer wall of piston rod 3 abut, third annular groove 203 is provided with first support ring 214, the inner wall of first support ring 214 is set as the inner wall of guide sleeve 2 and abuts with the outer wall of piston rod 3, the inner wall of guide sleeve 2 is provided with fourth annular groove 204 away from the end of annular connecting plate 225, second support ring 215 is arranged in fourth annular groove 204, the inner wall of second support ring 215 is set as the inner wall of guide sleeve 2 and abuts with the outer wall of piston rod 3, the height of the inner wall of first support ring 214 that is higher than the inner wall of guide sleeve 2 is consistent with the height of the inner wall of second support ring 215 that is higher than the inner wall of guide sleeve 2.

[0027] Need to explain, for annular structure, for example dustproof ring 212, antifouling ring 213, first support ring 214 and second support ring 215, the "inner side of annular structure" mentioned in the embodiment, specifically refers to the internal circular area surrounded by annular structure, accordingly, "the inner wall of annular structure", that is, the annular inner wall for surrounding the internal circular area of annular structure, can also be called the inner ring surface of annular structure.

[0028] Specifically, the oil cylinder sealing system in the embodiment mainly includes cylinder 1, guide sleeve 2, piston rod 3, dustproof ring 212, antifouling ring 213, first support ring 214 and second support ring 215, guide sleeve 2 is arranged in the open end of cylinder 1, the open end is the end of piston rod 3 in and out of the cylinder 1, and in order to keep guide sleeve 2 and cylinder 1 relative fixed, along the radial direction of the end of guide sleeve 2 and vertically extends the annular connecting plate 225 outward, thereby the annular connecting plate 225 and the open end of cylinder 1 are fixedly connected, in order to disassemble conveniently, the fixed connection mode can be connected by bolt the end face of annular connecting plate 225 and the open end of cylinder 1.

[0029] Further, in order to strengthen the sealing effect between the guide sleeve 2 and the piston rod 3 passing through it, the inner wall of the guide sleeve 2 near one end of the annular connecting plate 225 is sequentially provided with a first annular groove 201, a second annular groove 202 and a third annular groove 203, wherein the first annular groove 201 is near the annular connecting plate 225, a dustproof ring 212 is arranged in the first annular groove 201, and the inner wall of the dustproof ring 212 abuts against the outer wall of the piston rod 3 passing through it. In order to maintain the effect of the dustproof ring 212 scraping off impurities, the dustproof ring 212 can be fixedly connected with the inner wall of the first annular groove 201. Since the piston rod 3 may have external impurities attached to its outer surface during retraction, the dustproof ring 212 abutting against the outer wall of the piston rod 3 can remove the impurities attached to the surface of the piston rod 3, thereby avoiding the impurities from entering the oil cylinder, increasing the wear between the piston rod 3 and the guide sleeve 2, and affecting the sealing performance of the oil cylinder. The second annular groove 202 near the first annular groove 201 is provided with a dirt prevention ring 213, and the inner wall of the dirt prevention ring 213 abuts against the outer wall of the piston rod 3 passing through it, thereby providing secondary protection for the oil cylinder by the dirt prevention ring 213, and scraping off the impurities that are not completely scraped off by the dustproof ring 212 on the outer wall of the piston rod 3. The third annular groove 203 near the second annular groove 202 is provided with a first support ring 214, the inner wall of the first support ring 214 is higher than the inner wall of the guide sleeve 2 by a certain distance, i.e. the inner wall of the first support ring 214 is arranged to be higher than the slot of the guide groove, and the inner wall of the first support ring 214 abuts against the outer wall of the piston rod 3 passing through it. The first support ring 214 can be a rigid material with a certain strength and is not easy to deform, so when the inner wall of the first support ring 214 abuts against the outer wall of the piston rod 3, it can play a role in supporting and guiding the piston rod 3, so that the piston rod 3 maintains a certain gap with the inner wall of the guide sleeve 2, preventing the piston rod 3 from contacting the guide sleeve 2 and avoiding friction and wear. And under the action of the first support ring 214, the piston rod 3 can be prevented from deviating during reciprocating operation, avoiding the occurrence of unbalanced load of the piston rod 3, ensuring the stability of the piston rod 3 during operation, and reducing the friction between the piston rod 3 and other sealing elements. In order to further improve the supporting and guiding effect of the piston rod 3, a fourth annular groove 204 is arranged at the end of the inner wall of the guide sleeve 2 away from the annular connecting plate 225, i.e. a fourth annular groove 204 is arranged at the end of the inner wall of the guide sleeve 2 deep into the cylinder barrel 1, a second support ring 215 is arranged in the fourth annular groove 204, the inner wall of the second support ring 215 is arranged to be higher than the inner wall of the guide sleeve 2, and the heights of the inner walls of the first support ring 214 and the second support ring 215 are consistent, so that the piston rod 3 maintains a certain gap with the inner wall of the guide sleeve 2 under the common support of the first support ring 214 and the second support ring 215, avoiding the piston rod 3 and the guide sleeve 2 from contacting and causing damage due to friction.

[0030] The oil cylinder sealing system in the embodiment can effectively prevent foreign matters from entering the inside of the cylinder barrel 1, can effectively avoid the pollution of the foreign matters to the internal components and the hydraulic oil of the oil cylinder, and ensures the cleanliness of the inside of the oil cylinder. Meanwhile, the anti-pollution ring 213 in the second annular groove 202 abuts against the outer wall of the piston rod 3, further enhances the protection capability, can block the foreign matters, such as oil stains, water stains, small metal particles and the like, which cannot be removed by the dustproof ring from entering the oil cylinder, avoids the pollution of the foreign matters to the hydraulic oil and the abrasion of the internal components, thereby prolongs the service life of the hydraulic oil and the components of the oil cylinder. The first support ring 214 and the second support ring 215 respectively arranged at the two ends of the guide sleeve 2 support and guide the piston rod 3 penetrating therethrough, the support of the first support ring 214 and the second support ring 215 is like a track, guides the piston rod 3 to move along the correct axial direction, can prevent the piston rod 3 from deviating, avoids the unnecessary friction and extrusion of the piston rod 3 with the dustproof ring 212 and the anti-pollution ring 213 due to the deviation, ensures the stability of the functions of the sealing members such as the dustproof ring 212 and the anti-pollution ring 213, and improves the sealing effect of the oil cylinder. Moreover, the inner walls of the first support ring 214 and the second support ring 215 are arranged to be higher than the inner wall of the guide sleeve 2, so that the piston rod 3 penetrating through the first support ring 214 and the second support ring 215 keeps a certain gap with the inner wall of the guide sleeve 2 during the reciprocating operation, avoids the mutual friction between the piston rod 3 and the inner wall of the guide sleeve 2 to cause damage, and prolongs the service life of the oil cylinder.

[0031] Optionally, as shown in combination of 1 and 2, the system further comprises a lubricating oil path 4, the lubricating oil path 4 comprises a fifth annular groove 401 arranged at the middle part of the outer wall of the guide sleeve 2 and a sixth annular groove 402 arranged at the middle part of the inner wall of the guide sleeve 2, a through hole of the guide sleeve 2 communicating with the fifth annular groove 401 and the sixth annular groove 402, and an oil injection hole 403 arranged on the cylinder barrel 1, the position of the oil injection hole 403 matches the position of the fifth annular groove 401.

[0032] Optionally, the lubricating oil path 4 further comprises a oil discharge hole 404 arranged on the cylinder barrel 1 and symmetrically arranged with the oil injection hole 403, the oil injection hole 403 and the oil discharge hole 404 respectively communicate with the fifth annular groove 401.

[0033] In the optional embodiment, the fifth annular groove 401 is arranged at a proper position of the middle part of the outer wall of the guide sleeve 2, the sixth annular groove 402 is arranged at a position corresponding to the fifth annular groove 401 of the middle part of the inner wall of the guide sleeve 2, and the fifth annular groove 401 and the sixth annular groove 402 are communicated through the through hole arranged between the fifth annular groove 401 and the sixth annular groove 402 of the guide sleeve 2. In addition, the oil injection hole 403 is arranged at a position corresponding to the fifth annular groove 401 of the cylinder barrel 1, and the oil discharge hole 404 is arranged at a position symmetrical to the oil injection hole 403 of the cylinder barrel 1, so as to form a lubricating oil channel surrounding the inner wall and the outer wall of the guide sleeve 2 respectively. When the lubricating oil is injected from the oil injection hole 403 of the cylinder barrel 1, the lubricating oil first flows into the fifth annular groove 401, and then enters the sixth annular groove 402 of the inner wall of the guide sleeve 2 through the through hole, so as to lubricate the piston rod 3 arranged in the sixth annular groove 402, thereby reducing the friction coefficient between the piston rod 3 and the contact element, i.e. reducing the damage caused by the friction between the piston rod 3 and the dustproof ring 212, the dirt-proof ring 213, the first supporting ring 214 and the second supporting ring 215, and ensuring the sealing effect of the oil cylinder by the dustproof ring 212, the dirt-proof ring 213, the first supporting ring 214 and the second supporting ring 215. When it is necessary to replace the lubricating oil, the original old lubricating oil is first discharged through the oil discharge hole 404, and the new lubricating oil is re-injected from the oil injection hole 403. Through the lubricating oil channel 4, the friction and wear between the piston rod 3 and other components can be reduced, the probability of component failure can be reduced, the sealing effect of the oil cylinder can be improved, and the stable operation of the oil cylinder can be ensured.

[0034] It should be noted that the oil injection hole 403 can be arranged as a through hole with internal threads, an oil injection nozzle matched with the through hole is selected, the threaded end of the oil injection nozzle is screwed into the oil injection hole 403, the other end of the oil injection hole 403 is usually a conical type with a top end opening, and a spring and a ball are arranged inside the oil injection hole 403. In the normal state, the ball is pushed by the spring to close the top end opening, so as to prevent the lubricating oil from leaking. When the oil is injected, the ball is pressed down, so that the oil is injected through the top end opening of the oil injection nozzle. The oil discharge hole 404 can also be arranged as a through hole with internal threads, and the through hole is closed by screwing a plug matched with the through hole into the through hole. When the oil is discharged, the plug is unscrewed, so that the lubricating oil is discharged from the oil discharge hole 404.

[0035] Optionally, as shown in combination 1 and 2, the system further comprises a first sealing ring 216, a seventh annular groove 205 is arranged on the outer wall of the guide sleeve 2 close to one end of the annular connecting plate 225, and the first sealing ring 216 is arranged in the seventh annular groove 205. The outer wall of the first sealing ring 216 abuts against the inner wall of the cylinder barrel 1.

[0036] Optionally, as shown in combination with 1 and 2, the system further comprises a second sealing ring 217 and a first blocking ring 221, an eighth annular groove 206 is arranged on the outer wall of the guide sleeve 2 away from one end of the annular connecting plate 225, the second sealing ring 217 and the first blocking ring 221 are arranged in the eighth annular groove 206, the second sealing ring 217 and the first blocking ring 221 abut, and the outer wall of the second sealing ring 217 abuts the inner wall of the cylinder barrel 1.

[0037] Optionally, as shown in combination with 1 and 2, the system further comprises a third sealing ring 218 and a second blocking ring 222, a ninth annular groove 207 is arranged on the outer wall of the guide sleeve 2 close to one end of the eighth annular groove 206, the third sealing ring 218 and the second blocking ring 222 are arranged in the ninth annular groove 207, the third sealing ring 218 and the second blocking ring 222 abut, and the outer wall of the third sealing ring 218 abuts the inner wall of the cylinder barrel 1.

[0038] In this optional embodiment, a seventh annular groove 205 is arranged on the outer wall of the guide sleeve 2 close to one end of the annular connecting plate 225, a first sealing ring 216 is arranged in the seventh annular groove 205, the outer wall of the first sealing ring 216 abuts the inner wall of the cylinder barrel 1, the first sealing ring 216 can be an O-ring, and the material of the O-ring can be an elastic material such as rubber. By extruding the O-ring with the inner wall of the cylinder barrel 1 and the outer wall of the guide sleeve 2, the gap between them is eliminated, thereby achieving the effect of sealing and preventing lubricating oil from flowing out from the gap between the annular connecting plate 225 and the cylinder barrel 1.

[0039] Likewise, in order to prevent the lubricating oil from flowing into the cylinder 1 from the other end of the guide sleeve 2, or the hydraulic oil in the cylinder 1 from flowing into the lubricating oil passage 4, an eighth annular groove 206 is formed on the outer wall of the guide sleeve 2 away from the one end of the annular connecting plate 225, and a second sealing ring 217 and a first blocking ring 221 are arranged in the eighth annular groove 206. The second sealing ring 217 and the first blocking ring 221 in the eighth annular groove 206 abut, the outer wall of the second sealing ring 217 abuts against the inner wall of the oil cylinder, and the sealing ring can effectively isolate and close the lubricating oil passage 4 and the hydraulic oil in the cylinder 1, avoiding the mutual flow of the lubricating oil and the hydraulic oil. And because the hydraulic pressure in the cylinder 1 may be relatively high during the reciprocating movement of the piston, especially when the piston rod 3 is ejected, when the second sealing ring 217 is subjected to high pressure, the second sealing ring 217 may be squeezed into the gap between the cylinder 1 and the guide sleeve 2, causing the sealing ring to be damaged and the sealing to fail. By installing the first blocking ring 221 on one side of the first sealing ring 216, the material of the first blocking ring 221 is generally harder than that of the sealing ring, and under pressure, the blocking ring bears the main pressure, preventing the first sealing ring 216 from being squeezed into the gap between the cylinder 1 and the guide sleeve 2, thereby ensuring that the sealing ring can still work normally under high pressure.

[0040] Further, in order to enhance the sealing effect of the lubricating oil passage 4 and the hydraulic oil in the cylinder 1, a ninth annular groove 207 is formed on the outer wall of the guide sleeve 2 near the eighth annular groove 206, i.e. the ninth annular groove 207 is located between the eighth annular groove 206 and the fifth annular groove 401. Similarly, a third sealing ring 218 and a second blocking ring 222 are arranged in the ninth annular groove 207, the third sealing ring 218 and the second blocking ring 222 abut in the ninth annular groove 207, and the outer wall of the third sealing ring 218 abuts against the inner wall of the cylinder 1. Thus, through the cooperation of the third sealing ring 218 and the second blocking ring, the third sealing ring 218 is further sealed, better resisting the high pressure of the hydraulic oil in the cylinder 1, effectively reducing the risk of hydraulic oil leakage, and cooperating with the second sealing ring 217 to stabilize the pressure, so that the sealing structure can withstand higher pressure, ensuring the safe and stable operation of the oil cylinder.

[0041] Optionally, as shown in combination 1 and 2, the system further comprises a stator seal 223, and a tenth annular groove 208 is formed on the inner wall of the guide sleeve 2 near the fourth annular groove 204, and the stator seal 223 is arranged in the tenth annular groove 208, and the inner wall of the stator seal 223 abuts against the outer wall of the piston rod 3.

[0042] In this optional embodiment, in order to further improve the sealing effect between the piston rod 3 and the guide sleeve 2, a tenth annular groove 208 is formed on the inner wall of the guide sleeve 2 near one end of the fourth annular groove 204, and a Stellite seal 223 is arranged in the tenth annular groove 208, and the inner wall of the Stellite seal 223 abuts against the outer wall of the piston rod 3. The Stellite seal 223 is generally composed of a polytetrafluoroethylene sliding ring and a rubber O-shaped sealing ring. The O-shaped ring serves as a force element and is pre-compressed during installation, thereby generating radial and axial forces on the polytetrafluoroethylene sliding ring. That is, the O-shaped ring is compressed into the tenth annular groove 208 by the polytetrafluoroethylene sliding block, and the inner wall of the polytetrafluoroethylene sliding block is tightly attached to the outer surface of the piston rod 3, forming an initial seal. When the pressure in the cylinder 1 increases, hydraulic oil enters the cylinder 1, and the pressure acts on the polytetrafluoroethylene sliding ring, further enhancing the contact pressure between the sliding ring and the outer surface of the piston rod 3, thereby improving the sealing effect and effectively preventing hydraulic oil leakage.

[0043] Optionally, as shown in combination 1 and 2, the system further comprises a Y-shaped ring 224, and an eleventh annular groove 209 is formed on the inner wall of the guide sleeve 2 near one end of the tenth annular groove 208, and the Y-shaped ring 224 is arranged in the eleventh annular groove 209, and the inner wall of the Y-shaped ring 224 abuts against the outer wall of the piston rod 3.

[0044] In this optional embodiment, an eleventh annular groove 209 is formed on the inner wall of the guide sleeve 2 near one end of the tenth annular groove 208, and a Y-shaped ring 224 is arranged in the eleventh annular groove 209, and the inner wall of the Y-shaped ring 224 abuts against the outer wall of the piston rod 3, thereby further sealing the space between the piston rod 3 and the guide sleeve 2. The Y-shaped ring 224 is mainly used to prevent hydraulic oil from leaking from the gap between the piston rod 3 and the guide sleeve 2. When the cylinder 1 is filled with high-pressure hydraulic oil, the Y-shaped ring 224 will be elastically deformed under the action of oil pressure, and its lip will tightly adhere to the outer wall surface of the piston rod 3, thereby preventing hydraulic oil from leaking and ensuring the sealing effect between the piston rod 3 and the guide sleeve 2.

[0045] Optionally, as shown in combination 1 and 2, the system further comprises a fourth sealing ring 219, and a twelfth annular groove 210 is formed on the inner wall of the guide sleeve 2 near one end of the eleventh annular groove 209, and the fourth sealing ring 219 is arranged in the twelfth annular groove 210, and the inner wall of the fourth sealing ring 219 abuts against the outer wall of the piston rod 3.

[0046] In the optional embodiment, the gap between the piston rod 3 and the guide sleeve 2 is sealed by setting the second support ring 215, the stell ring, the Y-shaped ring and the sealing ring at one end of the guide sleeve 2 away from the annular connecting plate 225 at intervals, and preventing hydraulic leakage by setting the twelfth annular groove 210 on the inner wall of the guide sleeve 2 close to one end of the eleventh annular groove 209, and setting the fourth sealing ring 219 in the twelfth annular groove 210, and the outer wall of the fourth sealing ring 219 abutting against the inner wall of the cylinder barrel 1. The fourth sealing ring 219 can be an O-shaped ring, and the material of the O-shaped ring can be an elastic material such as rubber, the gap between the guide sleeve 2 and the piston rod 3 is eliminated by extrusion of the O-shaped ring by the guide sleeve 2 and the piston rod 3, so that the sealing effect is achieved, and the hydraulic oil is prevented from flowing out.

[0047] Optionally, as shown in 1 and 2, the system further comprises a fifth sealing ring 220, the inner wall of the guide sleeve 2 is provided with a thirteenth annular groove 211 between the second annular groove 202 and the third annular groove 203, and the fifth sealing ring 220 is arranged in the thirteenth annular groove 211, and the inner wall of the fifth sealing ring 220 abuts against the outer wall of the piston rod 3.

[0048] In the optional embodiment, in order to further prevent impurities outside the cylinder barrel 1 from entering the inside, the thirteenth annular groove 211 is arranged on the inner wall of the guide sleeve 2 between the second annular groove 202 and the third annular groove 203, and the fifth sealing ring 220 is arranged in the thirteenth annular groove 211, and the inner wall of the fifth sealing ring 220 abuts against the outer wall of the piston rod 3 arranged therein, that is, the fifth sealing ring 220 is arranged between the anti-pollution ring 213 and the first support ring 214, the fifth sealing ring 220 can be an O-shaped ring, and the material of the O-shaped ring can be an elastic material such as rubber, the gap between the guide sleeve 2 and the piston rod 3 is eliminated by extrusion of the O-shaped ring by the guide sleeve 2 and the piston rod 3, so that the sealing effect is achieved, and external impurities can be effectively prevented from entering.

[0049] Although the utility model discloses as above, the protection scope of the utility model is not limited to this. The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall into the protection scope of the utility model.

Claims

1. A hydraulic cylinder sealing system, characterized in that, The system includes a cylinder (1), a guide sleeve (2), a piston rod (3), a dust seal (212), a dirt seal (213), a first support ring (214), and a second support ring (215). The guide sleeve (2) is disposed inside the cylinder (1), and the piston rod (3) passes through the guide sleeve (2). One end of the guide sleeve (2) extends out of the opening end of the cylinder (1) and extends radially outward to form an annular connecting plate (225). The annular connecting plate (225) and the opening end of the cylinder (1) are fixedly connected by bolts. The inner wall of the guide sleeve (2) near the end of the annular connecting plate (225) is provided with a first annular groove (201), a second annular groove (202), and a third annular groove (203) spaced apart in sequence. The dust seal (212) is disposed in the first annular groove (201), and the inner wall of the dust seal (212) abuts against the outer wall of the piston rod (3). The second annular groove (214) and the second annular groove (215) are provided with a first annular groove (201), a second annular groove (202), and a third annular groove (203). The anti-fouling ring (213) is provided in the groove (202), and the inner wall of the anti-fouling ring (213) abuts against the outer wall of the piston rod (3). The first support ring (214) is provided in the third annular groove (203), and the inner wall of the first support ring (214) is set to be higher than the inner wall of the guide sleeve (2) and abut against the outer wall of the piston rod (3). A fourth annular groove (204) is provided at the end of the inner wall of the guide sleeve (2) away from the annular connecting plate (225). A second support ring (215) is provided in the fourth annular groove (204), and the inner wall of the second support ring (215) is set to be higher than the inner wall of the guide sleeve (2) and abut against the outer wall of the piston rod (3). The height of the inner wall of the first support ring (214) above the inner wall of the guide sleeve (2) is the same as the height of the inner wall of the second support ring (215) above the inner wall of the guide sleeve (2).

2. The hydraulic cylinder sealing system according to claim 1, characterized in that, It also includes a lubrication oil passage (4), which includes a fifth annular groove (401) corresponding to the middle of the outer wall of the guide sleeve (2) and a sixth annular groove (402) corresponding to the middle of the inner wall of the guide sleeve (2). The guide sleeve (2) has a through hole connecting the fifth annular groove (401) and the sixth annular groove (402), and an oil injection hole (403) provided on the cylinder (1). The position of the oil injection hole (403) matches the position of the fifth annular groove (401).

3. The hydraulic cylinder sealing system according to claim 2, characterized in that, The lubrication circuit (4) also includes an oil drain hole (404) disposed on the cylinder (1) and symmetrically disposed with the oil injection hole (403). The oil injection hole (403) and the oil drain hole (404) are respectively connected to the fifth annular groove (401).

4. The hydraulic cylinder sealing system according to claim 2, characterized in that, It also includes a first sealing ring (216), and a seventh annular groove (205) is provided on the outer wall of the guide sleeve (2) near the end of the annular connecting plate (225). The first sealing ring (216) is provided in the seventh annular groove (205), and the outer wall of the first sealing ring (216) abuts against the inner wall of the cylinder (1).

5. The hydraulic cylinder sealing system according to claim 4, characterized in that, It also includes a second sealing ring (217) and a first retaining ring (221). The outer wall of the guide sleeve (2) away from the annular connecting plate (225) is provided with an eighth annular groove (206). The second sealing ring (217) and the first retaining ring (221) are provided in the eighth annular groove (206). The second sealing ring (217) and the first retaining ring (221) abut against each other. The outer wall of the second sealing ring (217) abuts against the inner wall of the cylinder (1).

6. The hydraulic cylinder sealing system according to claim 5, characterized in that, It also includes a third sealing ring (218) and a second retaining ring (222). The outer wall of the guide sleeve (2) is provided with a ninth annular groove (207) near the end of the eighth annular groove (206). The third sealing ring (218) and the second retaining ring (222) are provided in the ninth annular groove (207). The third sealing ring (218) and the second retaining ring (222) abut against each other. The outer wall of the third sealing ring (218) abuts against the inner wall of the cylinder (1).

7. The hydraulic cylinder sealing system according to claim 1, characterized in that, It also includes a step seal (223), and a tenth annular groove (208) is provided on the inner wall of the guide sleeve (2) near the end of the fourth annular groove (204). The step seal (223) is provided in the tenth annular groove (208), and the inner wall of the step seal (223) abuts against the outer wall of the piston rod (3).

8. The hydraulic cylinder sealing system according to claim 7, characterized in that, It also includes a Y-ring (224), and an eleventh annular groove (209) is provided on the inner wall of the guide sleeve (2) near the end of the tenth annular groove (208). The Y-ring (224) is provided in the eleventh annular groove (209), and the inner wall of the Y-ring (224) abuts against the outer wall of the piston rod (3).

9. The hydraulic cylinder sealing system according to claim 8, characterized in that, It also includes a fourth sealing ring (219). A twelfth annular groove (210) is provided at one end of the inner wall of the guide sleeve (2) near the eleventh annular groove (209). The fourth sealing ring (219) is provided in the twelfth annular groove (210). The inner wall of the fourth sealing ring (219) abuts against the outer wall of the piston rod (3).

10. The hydraulic cylinder sealing system according to claim 1, characterized in that, It also includes a fifth sealing ring (220). The inner wall of the guide sleeve (2) is provided with a thirteenth annular groove (211) between the second annular groove (202) and the third annular groove (203). The fifth sealing ring (220) is provided in the thirteenth annular groove (211), and the inner wall of the fifth sealing ring (220) abuts against the outer wall of the piston rod (3).

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