Fatigue fracture prevention hydraulic oil cylinder

Abstract

The utility model relates to the field of hydraulic oil cylinders, and discloses an anti-fatigue fracture hydraulic oil cylinder which comprises a cylinder barrel, a front cover and a rear cover are installed at the two ends of the cylinder barrel respectively, oil inlet pipelines are arranged at the bottoms of the front cover and the rear cover respectively, the oil inlet pipelines are communicated with the outside through a filtering mechanism, and the filtering mechanism is arranged in the oil inlet pipelines. A piston rod is slidably connected to the interior of the cylinder barrel, a self-lubricating mechanism is arranged on the outer side of the piston rod, the filtering mechanism comprises a micro filter and a bypass valve, the input end of the micro filter is located in the oil inlet pipeline, and an oil inlet is formed in the bottom of the micro filter. According to the utility model, hydraulic oil is efficiently filtered through the micro-filter, the piston rod and a sealing element are prevented from being abraded, and a backwashing function is realized through the bypass valve, so that the filtering efficiency is kept. Meanwhile, the lubricating lantern ring in the cylinder barrel is combined with the rotating steel balls, lubricating oil is evenly transferred to the piston rod, continuous lubrication is achieved, friction and heat accumulation are reduced, and abrasion is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hydraulic oil cylinder especially relates to prevent fatigue fracture hydraulic oil cylinder. BACKGROUND

[0002] Hydraulic cylinder is a kind of execution element that converts hydraulic energy into mechanical energy, usually used to realize linear motion, widely used in engineering machinery, industrial equipment, agricultural machinery, aerospace and other fields.In construction, hydraulic cylinder is used for the action execution of bulldozer, excavator and other equipment;In industrial production, it is often used in automatic equipment, hydraulic machine and logistics conveying equipment;In the agricultural and shipping industry, it is used to control agricultural implements and ship hoisting device etc.Due to its efficient and stable power transmission performance, hydraulic cylinder becomes an indispensable core component in many mechanical systems.

[0003] Hydraulic cylinder is the execution element of hydraulic system, and its basic structure includes cylinder, piston, piston rod, end cover (front cover and rear cover) and sealing element (front cover is equipped with rod sealing element and dustproof ring).Its main function is to convert hydraulic energy into mechanical energy, and realize the output of force and displacement through the reciprocating linear motion of piston.Working mode is that high-pressure oil is provided by hydraulic pump, enters the cavity of oil cylinder through pipeline, drives piston to produce linear motion, thereby driving mechanical device to complete push-pull, lifting or steering action.Hydraulic cylinder is usually divided into single-acting and double-acting, single-acting cylinder relies on oil pressure to complete action in one direction, and returns by external force;While double-acting cylinder can realize bidirectional movement through oil pressure, and is widely used in various scenes requiring accurate force and displacement control.

[0004] However, in the actual use of hydraulic cylinder, due to long-term bearing of cyclic load, micro cracks are generated in the internal metal material, gradually expand at stress concentration position, and finally break due to fatigue accumulation.If not properly maintained, hydraulic oil pollution will significantly aggravate this process.After pollutants (such as particulate matter, moisture or oxide) enter the hydraulic system, they will scratch the surface of piston rod and cylinder, increase the surface roughness, aggravate friction and wear.At the same time, pollutants can accelerate the aging failure of sealing element, cause hydraulic oil leakage, lead to internal pressure fluctuation, and further reduce the fatigue resistance of oil cylinder.In addition, pollutants may also block hydraulic passage, cause local overload, accelerate fatigue crack propagation, and eventually significantly shorten the service life of oil cylinder.

[0005] In view of the above problems, the fatigue fracture prevention hydraulic oil cylinder is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0006] In order to make up for the above shortcomings, the utility model provides a fatigue fracture prevention hydraulic oil cylinder, which aims to solve the problem that hydraulic oil pollution can aggravate the friction between piston rod and cylinder, thereby reducing the fatigue resistance of hydraulic oil cylinder, and even causing cylinder fracture.

[0007] In order to achieve the above object, the utility model discloses the following technical scheme: fatigue fracture prevention hydraulic oil cylinder, including cylinder barrel, the both ends of cylinder barrel are installed with front cover and back cover respectively, and the bottom of both is provided with oil inlet pipeline, the oil inlet pipeline is through filter mechanism with the outside, the inside of oil inlet pipeline is provided with filter mechanism, the inside sliding connection of cylinder barrel has piston rod, the outside of piston rod is provided with self -lubricating mechanism.

[0008] The filter mechanism includes a micro filter and a bypass valve, the input end of the micro filter is located in the inside of the oil inlet pipeline, and the bottom of the micro filter is provided with an oil inlet.

[0009] As a further description of the above technical scheme:

[0010] The bypass valve is connected with the micro filter through the side wall of the oil inlet pipeline.

[0011] As a further description of the above technical scheme:

[0012] The side, away from the oil inlet pipeline, of the bypass valve is connected with a recovery tank, and the bottom of the oil inlet is connected with a hydraulic oil tank through a pipeline.

[0013] As a further description of the above technical scheme:

[0014] The self-lubricating mechanism includes a lubricating sleeve ring, the top of the lubricating sleeve ring is provided with an oil filling port, the inside of the lubricating sleeve ring is provided with an oil injection cavity, and a plurality of lubricating steel balls are annularly installed in the inside of the lubricating sleeve ring.

[0015] As a further description of the above technical scheme:

[0016] The lubricating sleeve ring is sleeved on the outside of the piston rod.

[0017] As a further description of the above technical scheme:

[0018] The outside of the oil filling port penetrates the side wall of the cylinder barrel, and a one-way valve is installed on the top of the oil filling port.

[0019] As a further description of the above technical scheme:

[0020] The inside of the oil injection cavity is filled with lubricating oil.

[0021] As a further description of the above technical scheme:

[0022] The opposite side between the plurality of lubricating steel balls abuts against the outside of the piston rod, and the outside of the lubricating steel balls is coated with lubricating oil.

[0023] The utility model has the advantages that:

[0024] 1、The utility model discloses a micro filter is set up to the hydraulic oil, and the particle, moisture and other pollutants can be effectively removed, the abrasion of impurity to piston rod and sealing element can be prevented, and the friction and the leakage can be reduced, simultaneously, the filtration function can keep the cleanness of the hydraulic oil, avoids the pressure fluctuation and partial overload in the hydraulic system, thereby delays the fatigue crack formation of the hydraulic oil cylinder, the reliability and the service life of system are improved obviously, and the backflushing function is still provided with on the micro filter, and the bypass valve can be closed oil inlet pipeline, and the hydraulic oil backflushes the micro filter, and the impurity and the hydraulic oil flow into the recovery tank from the bypass valve, guaranteeing the filtration efficiency.

[0025] 2、The utility model discloses a lubricating sleeve ring is installed in the cylinder barrel and combines the steel ball that can be stressed to rotate, and the lubricating oil in the oil injection cavity is continuously transferred to the piston rod, and the continuous lubrication is carried out. The steel ball forms the rolling contact with the piston rod under the cover of lubricating liquid, can effectively reduce the friction coefficient, reduces the surface wear, prolongs the service life of sealing element and piston rod. Still can reduce the heat accumulation because of high frequency movement, further promotes the working efficiency and stability of hydraulic oil cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the three-dimensional schematic view of the anti-fatigue fracture hydraulic oil cylinder that the utility model proposes;

[0027] Figure 2 It is the structure schematic view of the piston rod of the anti-fatigue fracture hydraulic oil cylinder that the utility model proposes; Figure 1

[0028] Figure 3 It is the structure schematic view of the lubricating steel ball of the anti-fatigue fracture hydraulic oil cylinder that the utility model proposes.

[0029] Figure 4 It is the structure schematic view of the lubricating steel ball of the anti-fatigue fracture hydraulic oil cylinder that the utility model proposes.

[0030] LEGEND:

[0031] 1, cylinder barrel;2, front cover;3, rear cover;4, oil inlet pipeline;5, filter mechanism;501, micro filter;502, oil inlet;503, bypass valve;6, piston rod;7, self-lubricating mechanism;701, lubricating sleeve ring;702, oil filler;703, oil injection cavity;704, lubricating steel ball. DETAILED DESCRIPTION

[0032] ​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0033] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. Figure 1 Figure 2 The present application provides an embodiment: a fatigue fracture prevention hydraulic oil cylinder, comprising a cylinder barrel 1, the two ends of which are respectively provided with a front cover 2 and a rear cover 3, and the bottoms of the two are provided with an oil inlet pipeline 4 for inputting and circulating hydraulic oil. The inside of the oil inlet pipeline 4 is integrated with a filtering mechanism 5, which comprises a micro filter 501 and a bypass valve 503. The micro filter 501 is installed inside the oil inlet pipeline 4 and is used for efficiently filtering the hydraulic oil to prevent particulate matter and impurities from entering the hydraulic system. The bypass valve 503 penetrates through the side wall of the oil inlet pipeline 4 and is connected with the micro filter 501, and can open the backwashing function of the equipment when the micro filter 501 is blocked or the pressure is too high, thereby ensuring the normal operation of the hydraulic system. The bottom of the micro filter 501 is provided with an oil inlet 502 connected with a hydraulic oil tank through a pipeline, thereby ensuring that the input of the hydraulic oil source is clean and stable. At the same time, the other end of the bypass valve 503 is connected with a recovery tank for collecting the filtered impurities, thereby facilitating regular cleaning and maintenance, and improving the operation efficiency and service life of the hydraulic oil cylinder.

[0034] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. Figure 3 Figure 4 The inside of the cylinder barrel 1 is slidably connected with a piston rod 6, and a self-lubricating mechanism 7 is arranged on the outer side of the piston rod 6 to realize efficient lubrication of the piston rod 6. The self-lubricating mechanism 7 comprises a lubricating sleeve ring 701, which is a hollow annular structure and is sleeved on the outer side of the piston rod 6. The top of the lubricating sleeve ring 701 is provided with an oil filler hole 702 penetrating through the side wall of the cylinder barrel 1, thereby facilitating the supplement of lubricating oil from the outside. A one-way valve is installed on the top of the oil filler hole 702, which can prevent the backflow or contamination of the lubricating oil. The inside of the lubricating sleeve ring 701 is provided with an oil injection cavity 703 filled with lubricating oil, thereby providing a stable oil source for lubrication. A plurality of lubricating steel balls 704 are annularly arranged in the inside of the lubricating sleeve ring 701, which contact the outer side of the piston rod 6 by rotating to realize rolling lubrication, thereby reducing friction loss and surface wear. The surface of the lubricating steel balls 704 is covered with lubricating oil, which can effectively reduce the friction and heat accumulation when the piston rod 6 reciprocates, thereby significantly prolonging the service life of the hydraulic oil cylinder and improving the operation stability.

[0035] ​​Working principle: fatigue fracture hydraulic cylinder is prevented by setting filter mechanism 5 and self-lubricating mechanism 7 to realize efficient operation. The filter mechanism 5 in the oil inlet pipeline 4 is composed of a micro filter 501 and a bypass valve 503, which can filter the hydraulic oil efficiently and prevent impurities from entering the system. When the filter is blocked or the pressure is too high, the bypass valve 503 opens the backwashing function to ensure the normal operation of the system and recycle the impurities for easy cleaning. The self-lubricating mechanism 7 is equipped on the outer side of the piston rod 6 in the cylinder barrel 1. The lubricating oil is stored in the oil injection cavity 703 in the lubricating sleeve ring 701, and the lubricating steel ball 704 rolls in contact with the outer side of the piston rod 6 to realize continuous lubrication, effectively reduce friction loss and heat accumulation, prolong the service life of the equipment and improve stability.

[0036] Finally, it should be pointed out that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. made within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. Fatigue resistant hydraulic cylinder comprising a cylinder barrel (1), characterized in that: The both ends of the cylinder (1) are respectively installed with front cover (2) and rear cover (3), and the bottom of both is provided with oil inlet pipeline (4), the oil inlet pipeline (4) is through filter mechanism (5) with outside, the inside of oil inlet pipeline (4) is provided with filter mechanism (5), the inside of cylinder (1) is connected with piston rod (6) slidingly, the outside of piston rod (6) is provided with self-lubricating mechanism (7). The filter mechanism (5) includes micro filter (501) and bypass valve (503), the input end of micro filter (501) is located in the inside of oil inlet pipeline (4), the bottom of micro filter (501) is provided with oil inlet (502).

2. The fatigue fracture resistant hydraulic cylinder of claim 1, wherein: The bypass valve (503) is connected with micro filter (501) through the side wall of oil inlet pipeline (4).

3. The fatigue fracture resistant hydraulic cylinder of claim 1, wherein: The side of bypass valve (503) away from oil inlet pipeline (4) is connected with recovery tank, the bottom of oil inlet (502) is connected with hydraulic oil tank through pipeline.

4. The fatigue fracture resistant hydraulic cylinder of claim 1, wherein: The self-lubricating mechanism (7) includes lubricating sleeve ring (701), the top of lubricating sleeve ring (701) is provided with oil filling port (702), the inside of lubricating sleeve ring (701) is provided with oil injection cavity (703), and a plurality of lubricating steel balls (704) are annularly installed in the inside of lubricating sleeve ring (701).

5. The fatigue fracture resistant hydraulic cylinder of claim 4, wherein: The lubricating sleeve ring (701) is sleeved on the outside of piston rod (6).

6. The fatigue fracture resistant hydraulic cylinder of claim 4, wherein: The outside of oil filling port (702) penetrates the side wall of cylinder (1), and a one-way valve is installed on the top of oil filling port (702).

7. The fatigue fracture resistant hydraulic cylinder of claim 4, wherein: The inside of oil injection cavity (703) is full of lubricating oil.

8. The fatigue fracture resistant hydraulic cylinder of claim 4, wherein: The opposite side between a plurality of lubricating steel balls (704) abuts against the outside of piston rod (6), and the outside of lubricating steel balls (704) is coated with lubricating oil.

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