Hydraulic rotary oil cylinder

Abstract

The utility model discloses a hydraulic rotary oil cylinder which comprises a cylinder body, a cylinder rod, an end cover, a piston and a rotary joint, the cylinder body is in a straight cylinder shape and is hollow, and one end of the cylinder body is provided with a flange end face. The cylinder rod is arranged in the cylinder body and concentric with the cylinder body, one end of the cylinder rod extends out of the cylinder body, and the other end of the cylinder rod is fixedly connected with the piston. The end cover is arranged at the end of the cylinder body and fixedly connected with the cylinder body, and the end cover and the cylinder rod are sealed through a sealing ring. The outer edge of the piston makes sealing contact with the interior of the cylinder body through a sealing ring, and the interior of the cylinder body is divided into a rod cavity and a rodless cavity. The rotary joint comprises a core shaft and a shell, the core shaft is fixedly connected with the cylinder body, the shell is arranged below the core shaft in a sleeving manner, oil ducts which are communicated with each other are arranged in the shell and the core shaft, and the oil ducts are communicated with the rod cavity and the rodless cavity; an interlayer oil channel communicated with the rod cavity is formed in the cylinder body, the oil cylinder is of a built-in interlayer oil channel and rotary joint structure, and the problems of oil pipe winding and leakage are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydraulic transmission, especially a hydraulic rotary oil cylinder. BACKGROUND

[0002] Hydraulic oil cylinder is a common linear motion execution element, which is widely used in various mechanical systems. However, in the working condition that the oil cylinder needs to rotate synchronously with the equipment, the traditional hydraulic oil cylinder has the following problems and shortcomings:

[0003] 1. Oil pipe winding problem: the traditional oil cylinder usually uses external oil pipe to transport hydraulic oil. When the oil cylinder rotates with the equipment, the oil pipe is easy to wind, twist or even break, which affects the system stability and service life (such as the hydraulic cylinder structure disclosed in patent CN102278391A).

[0004] 2. Oil leakage risk: the external oil pipe is usually connected through threaded joints, which is easy to cause sealing failure due to vibration or wear during rotation, resulting in hydraulic oil leakage (such as the pipe connection method described in patent CN103032476A).

[0005] 3. Complex structure and difficult maintenance: some existing technologies use complex rotary sealing structure or additional rotary joint, which not only increases the manufacturing cost, but also makes the overall structure of the oil cylinder bulky, which is not conducive to the installation in compact space (such as the multi-stage sealing design in patent CN104373454A).

[0006] In view of the above problems, how to design a hydraulic oil cylinder that can effectively avoid the problems of oil pipe winding and oil leakage is particularly important. INVENTION CONTENTS

[0007] In order to overcome the problems of oil pipe winding, oil leakage and complex structure of the hydraulic oil cylinder in the prior art under the rotary working condition, the utility model provides a hydraulic rotary oil cylinder, which effectively avoids the problems of oil pipe winding and leakage through the built-in sandwich oil channel and rotary joint structure, simplifies the overall structure, improves the reliability and service life.

[0008] The utility model discloses a hydraulic rotary oil cylinder that solves the technical problems thereof adopts the technical scheme: a hydraulic rotary oil cylinder, including cylinder body, cylinder rod, end cover, piston and rotary joint, the cylinder body is straight and hollow in the inside, and one end is equipped with flange end face, the cylinder rod is arranged in the inside of cylinder body and is arranged concentrically with cylinder body, and one end of cylinder rod extends to the outside of cylinder body, and the other end is fixedly connected with piston, the end cover is arranged at the end of cylinder body and is fixedly connected with cylinder body, and is sealed between end cover and cylinder rod through sealing washer, the outer edge of piston is sealed contact with the inside of cylinder body through sealing washer, and divides the inside of cylinder body into rod cavity and rodless cavity, the rotary joint includes mandrel and casing, and the mandrel is fixedly connected with cylinder body, and the casing is sleeved below the mandrel, and the casing and the inside of mandrel are equipped with the oil channel that communicates, and the oil channel communicates with rod cavity and rodless cavity, the interlayer oil channel is seted up in the inside of cylinder body and communicates with rod cavity.

[0009] The above-mentioned hydraulic rotary oil cylinder, the casing of rotary joint remains stationary, and the mandrel rotates synchronously with the cylinder body.

[0010] The above-mentioned hydraulic rotary oil cylinder, the interlayer oil channel is annular or spiral distribution.

[0011] The above-mentioned hydraulic rotary oil cylinder, the inlet and outlet of interlayer oil channel are equipped with sealing structure.

[0012] The above-mentioned hydraulic rotary oil cylinder, the mandrel of rotary joint is equipped with a plurality of sealing rings between cylinder body.

[0013] The above-mentioned hydraulic rotary oil cylinder, the sealing structure is equipped between end cover and cylinder body.

[0014] The utility model discloses the beneficial effect is:

[0015] 1. avoid winding of oil pipe: through the design of rotary joint and built-in interlayer oil channel, the oil pipe does not need to rotate with the cylinder body, and the risk of winding is eliminated.

[0016] 2. improve sealing reliability: adopt multilayer sealing structure (end cover, piston, rotary joint), reduce oil leakage, prolong service life.

[0017] 3. compact structure, convenient to maintain: cancel external catheter, simplify overall structure, reduce assembly difficulty, suitable for narrow space installation.

[0018] 4. movement is stable: interlayer oil channel optimizes oil flow, ensures that oil pressure is stable, improves cylinder rod movement precision. DRAWINGS

[0019] The utility model is further explained below in combination with examples.

[0020] Figure 1 It is the structural schematic diagram of example.

[0021] In the figure: 1, cylinder; 11, flange end face; 12, outer layer; 13, inner layer; 2, cylinder rod; 3, end cover; 4, piston; 5, rotary joint; 51, mandrel; 52, shell; 6, rod cavity; 7, rodless cavity; 8, interlayer oil passage. DETAILED DESCRIPTION

[0022] Embodiment

[0023] This embodiment describes the specific structure and working principle of a hydraulic rotary oil cylinder, aiming to solve the problems of oil leakage, unstable oil pressure and oil pipe winding caused by external guide pipe during the rotation of traditional oil cylinder. Through unique design, the hydraulic rotary oil cylinder realizes efficient and stable transmission of hydraulic oil, while ensuring the reliability and durability of the oil cylinder during rotation, as shown in Figure 1 The hydraulic rotary oil cylinder mainly consists of cylinder 1, cylinder rod 2, end cover 3, piston 4, rotary joint 5 and other key components. The cylinder 1 is straight and hollow inside, with a flange end face 11 at one end for easy connection with the equipment and synchronous circumferential rotation. The cylinder 1 is arranged concentrically with the cylinder rod 2 inside, which can reciprocate along the axial direction of the cylinder 1. The end of the cylinder 1 is fixedly connected with the end cover 3, which is sealed between the cylinder rod 2 by multiple sealing rings to prevent hydraulic oil leakage. The end of the cylinder rod 2 is fixedly connected with the piston 4, which is sealed with the inside of the cylinder 1 by multiple sealing rings, thus dividing the inside of the cylinder 1 into two independent cavities: rod cavity 6 and rodless cavity 7.

[0024] The cylinder 1 is the main part of the oil cylinder, which is hollow inside and has uniform wall thickness to ensure sufficient strength and stiffness. The flange end face 11 is provided with multiple mounting holes for connecting the cylinder 1 with the equipment through bolts and other fasteners. After the cylinder 1 is connected with the equipment, it can rotate synchronously with the equipment to meet the needs of specific application scenarios. The cylinder rod 2 is arranged inside the cylinder 1 and is concentrically arranged with the cylinder 1. One end of the cylinder rod 2 extends to the outside of the cylinder 1 for connection with the external actuator, and the other end is fixedly connected with the piston 4. The surface of the cylinder rod 2 is precisely machined to ensure uniform and small gap between it and the inner wall of the cylinder 1, thereby reducing the leakage of hydraulic oil between the cylinder rod 2 and the inner wall of the cylinder 1. In addition, the cylinder rod 2 is made of high-strength, corrosion-resistant alloy steel to ensure its stability and reliability during high-pressure and high-speed movement.

[0025] The end cover 3 is arranged at the end of the cylinder body 1 and is fixedly connected with the cylinder body 1 through fasteners such as bolts, is arranged in a sleeved manner between the end cover 3 and the cylinder rod 2, and is sealed through a plurality of sealing rings made of high-performance rubber or polytetrafluoroethylene and the like, which have good sealing performance and wear resistance. During reciprocating movement of the cylinder rod 2, the sealing rings can always maintain close contact with the surface of the cylinder rod 2, thereby effectively preventing hydraulic oil from leaking. In addition, a sealing structure is also arranged between the end cover 3 and the cylinder body 1 to ensure that hydraulic oil in the cylinder body 1 does not leak from the gap between the end cover 3 and the cylinder body 1. The sealing structure is also made of high-performance sealing materials and ensures its sealing performance through precise machining and assembly processes.

[0026] The piston 4 is arranged at the end of the cylinder rod 2 and is fixedly connected with the cylinder rod 2. The outer edge of the piston 4 is in sealed contact with the inside of the cylinder body 1 through a plurality of sealing rings, thereby dividing the inside of the cylinder body 1 into two independent cavities, i.e., a rod cavity 6 and a rodless cavity 7. The rod cavity 6 is located on the side of the piston 4 close to the cylinder rod 2 extending out of the cylinder body 1, and the rodless cavity 7 is located on the other side of the piston 4. Under the action of hydraulic oil, the piston 4 can reciprocate along the axial direction of the cylinder body 1. When hydraulic oil enters the rod cavity 6, the piston 4 is subjected to an outward thrust, thereby driving the cylinder rod 2 to extend outward. When hydraulic oil enters the rodless cavity 7, the piston 4 is subjected to an inward pull, thereby driving the cylinder rod 2 to retract inward. By controlling the flow direction and flow rate of the hydraulic oil, precise motion control of the cylinder rod 2 can be achieved.

[0027] The rotary joint 5 is one of the key components of the hydraulic rotary oil cylinder and solves the problem of oil pipe winding during rotation of a traditional oil cylinder. The rotary joint 5 is composed of a mandrel 51 and a housing 52. The mandrel 51 is arranged at the tail of the cylinder body 1 and is fixedly connected with the cylinder body 1. A plurality of sealing rings are arranged between the mandrel 51 and the cylinder body 1 to achieve sealing operation, so as to prevent hydraulic oil from leaking from the gap between the mandrel 51 and the cylinder body 1. The housing 52 is arranged below the mandrel 51 and forms a gap with the mandrel 51. The housing 52 and the mandrel 51 are both arranged with oil channels that are connected with each other and with the rod cavity 6 and the rodless cavity 7 inside the cylinder body 1. When the cylinder body 1 rotates synchronously with the equipment, the housing 52 remains stationary, while the mandrel 51 rotates with the cylinder body 1. Since the oil channels between the housing 52 and the mandrel 51 are connected, hydraulic oil can be transmitted between the cylinder body 1 and the external oil pipe through the oil channels without causing oil pipe winding. In addition, the rotary joint 5 is also provided with a plurality of sealing structures to ensure the sealing performance of the hydraulic oil during transmission. The sealing structures are made of high-performance sealing materials and ensure their sealing performance through precise machining and assembly processes. During operation of the rotary joint 5, the sealing structures can always maintain close contact between the mandrel 51 and the housing 52, thereby effectively preventing hydraulic oil from leaking.

[0028] In view of the problems that the traditional external guide pipe of the oil cylinder is easy to be damaged by collision and the threaded connection is easy to leak, the hydraulic rotary oil cylinder cancels the guide pipe structure, the cylinder body 1 is composed of an outer layer 12 and an inner layer 13 arranged in a sleeve manner, and a sandwich oil channel 8 is left between the outer layer and the inner layer and is connected with the rod cavity 6. The design of the sandwich oil channel 8 cleverly utilizes the space inside the cylinder body 1, so that the oil can flow into the rod cavity 6 along the sandwich oil channel 8, thereby avoiding the use of the external guide pipe. In the inner wall of one side of the cylinder body 1, one or more oil channels connected with the rod cavity 6 are opened through a precise mechanical processing process. These oil channels are distributed in a ring shape or a spiral shape to ensure that the oil can flow uniformly and smoothly into the rod cavity 6. Meanwhile, sealing structures are arranged at the inlet and outlet of the oil channel to prevent hydraulic oil from leaking from the gap between the oil channel and the inner wall of the cylinder body 1. The design of the sandwich oil channel 8 not only solves the problem that the external guide pipe is easy to be damaged by collision, but also improves the sealing performance and reliability of the oil cylinder. Since the oil flows inside the cylinder body 1, it is not affected by the external environment, thereby reducing the risk of oil leakage. In addition, the design of the sandwich oil channel 8 also simplifies the structure and assembly process of the oil cylinder, reduces the manufacturing cost and maintenance cost, and improves the sealing performance and reliability of the oil cylinder.

[0029] The working principle of the hydraulic rotary oil cylinder is as follows: when the hydraulic system supplies oil to the rodless cavity 7, the oil pressure in the rodless cavity 7 rises, pushing the piston 4 to move towards the rod cavity 6, thereby driving the cylinder rod 2 to extend outward. At this time, the oil in the rod cavity 6 flows back to the hydraulic system through the sandwich oil channel 8. When the hydraulic system supplies oil to the rod cavity 6, the oil pressure in the rod cavity 6 rises (due to the existence of the sandwich oil channel 8, the oil pressure can be quickly established and maintained stable), pushing the piston 4 to move towards the rodless cavity 7, thereby driving the cylinder rod 2 to retract inward. At this time, the oil in the rodless cavity 7 flows back to the hydraulic system through another oil channel.

[0030] The hydraulic rotary oil cylinder has the following performance advantages:

[0031] Good sealing performance: by adopting multiple high-performance sealing rings and sealing structures, the sealing performance between the cylinder body 1, the cylinder rod 2, the piston 4 and the rotary joint 5 and other key components is ensured, effectively preventing hydraulic oil leakage.

[0032] High reliability: the external guide pipe structure is cancelled, avoiding the risk of guide pipe collision damage and threaded connection leakage, improving the reliability and durability of the oil cylinder.

[0033] Oil pipe does not wind: through the arrangement of the rotary joint 5, the oil pipe does not rotate synchronously with the cylinder body 1, thereby avoiding the winding of the oil pipe, improving the use convenience and safety of the oil cylinder.

[0034] Compact structure: the design of the sandwich oil channel 8 simplifies the structure and assembly process of the oil cylinder, making the oil cylinder more compact, lightweight, easy to install and maintain.

[0035] Motion stability: By precisely controlling the flow direction and flow rate of hydraulic oil, precise motion control of the cylinder rod 2 can be achieved, ensuring the motion stability and accuracy of the oil cylinder during rotation.

[0036] In summary, the hydraulic rotary oil cylinder solves many problems existing in traditional oil cylinders during rotation through unique design and innovative structure, has significant performance advantages and application value, and will have broad application prospects and market potential in the fields of future industrial automation, robot technology, etc.

[0037] During operation, first, the cylinder body 1 of the hydraulic rotary oil cylinder is connected to the target equipment through the flange end face 11, ensuring that the flange end face 11 is tightly attached to the surface of the equipment, and fasteners such as bolts are used to firmly fix the two, during installation, attention should be paid to keeping the axis of the cylinder body 1 concentric with the rotation axis of the equipment, to ensure the stability and accuracy of the oil cylinder during rotation, check whether the connection between the cylinder body 1 and the equipment is firm, to avoid the oil cylinder from shaking or falling off due to looseness, then connect the oil supply pipe and the oil return pipe of the hydraulic system to the corresponding oil ports on the shell 52 of the rotary joint 5, during connection, ensure that the seal between the oil pipe and the oil port is good, to avoid hydraulic oil leakage, since the shell 52 of the rotary joint 5 remains stationary, and the mandrel 51 rotates with the cylinder body 1, the oil pipe will not rotate synchronously with the cylinder body 1, thus avoiding the problem of oil pipe winding, during connection of the oil pipe, ensure that the direction of the oil pipe is reasonable, to avoid interference with other components, if the oil cylinder is equipped with electrical elements such as position sensors and pressure sensors, the signal lines of these elements need to be connected to the control system, to ensure that the electrical connection is correct and accurate, so that the control system can accurately obtain the working state information of the oil cylinder.

[0038] Before starting the hydraulic system, check the oil level, oil quality of the hydraulic oil and the pressure setting of the hydraulic system, to ensure that the hydraulic oil is sufficient and clean, and the pressure setting of the hydraulic system meets the working requirements of the oil cylinder, start the hydraulic system, slowly increase the oil supply pressure, observe the motion of the oil cylinder, check whether the oil cylinder can smoothly and accurately extend and retract, and whether there is abnormal noise or vibration, on the basis that the oil cylinder can normally extend and retract, test its rotation function, by controlling the rotation mechanism of the equipment, make the cylinder body 1 rotate synchronously with the equipment, observe the working condition of the rotary joint 5, to ensure that the oil pipe does not rotate synchronously with the cylinder body 1, and the transmission of hydraulic oil is not affected, check the sealing performance of the oil cylinder during rotation, to ensure that there is no hydraulic oil leakage, according to the actual application requirements, adjust the oil supply pressure, flow rate of the hydraulic system and the motion speed of the oil cylinder, etc. parameters, through multiple tests and adjustments, find the optimal parameter combination, to ensure that the oil cylinder can meet the working requirements and realize efficient and stable operation.

[0039] When the oil cylinder needs to extend, the control system sends instructions to the hydraulic system to make hydraulic oil enter the rodless cavity 7. As the oil pressure in the rodless cavity 7 rises, the piston 4 is subjected to an outward thrust, thereby driving the cylinder rod 2 to extend outward. During the extension process, the movement of the oil cylinder should be closely observed to ensure that the extension speed, force, and position meet the work requirements. If there is any abnormality, the operation should be stopped immediately and the cause should be checked. When the oil cylinder needs to be retracted, the control system sends instructions to the hydraulic system to make hydraulic oil enter the rod cavity 6 (through the interlayer oil way 8). As the oil pressure in the rod cavity 6 rises, the piston 4 is subjected to an inward pull, thereby driving the cylinder rod 2 to retract inward. During the retraction process, the movement of the oil cylinder should also be closely observed to ensure that the retraction speed, force, and position meet the work requirements. If the oil cylinder needs to rotate with the equipment, the rotation mechanism of the control equipment should be used to achieve rotation. During the rotation process, the rotation speed, angle, and stability of the oil cylinder should be ensured to meet the work requirements. At the same time, the working condition of the rotary joint 5 should be closely observed to ensure that the oil pipe is not wound or damaged due to rotation.

[0040] The hydraulic rotary oil cylinder should be regularly inspected, including the wear condition, sealing performance, and connection and fastening condition of key components such as the cylinder body 1, cylinder rod 2, end cover 3, piston 4, and rotary joint 5. The oil level, oil quality, and pressure setting of the hydraulic system should be checked to ensure that the hydraulic system is in good working condition. The oil cylinder should be regularly cleaned to remove surface dirt, dust, and other impurities. During the cleaning process, corrosive cleaning agents should be avoided to prevent damage to the surface of the oil cylinder. The moving parts of the oil cylinder should be lubricated to reduce wear and friction resistance. During the lubrication process, lubricants that match the material of the oil cylinder should be used, and the lubricants should be evenly applied to the surface of the moving parts. When worn, aged, or damaged sealing elements or vulnerable elements are found, they should be replaced in a timely manner. During the replacement process, the specifications and models of the new sealing elements or vulnerable elements should be consistent with the original elements, and the correct installation method should be followed. When the oil cylinder fails, operation should be stopped immediately and troubleshooting should be performed. According to the fault phenomenon and possible causes, the inspection and repair should be performed step by step. During the repair process, relevant safety operation procedures and repair manuals should be followed to ensure the safety and effectiveness of the repair work.

[0041] When operating the hydraulic rotary cylinder, it is necessary to strictly follow the relevant safety operating procedures to avoid any operation that may endanger personal safety during the movement of the cylinder. When maintaining, servicing or repairing the cylinder, it is necessary to ensure that the hydraulic system has been completely depressurized and the power supply such as electricity has been disconnected to prevent accidents such as accidental start or electric shock. When using the cylinder, it is necessary to avoid exceeding its rated load capacity, as overloading may cause damage to the cylinder, failure of the seal or failure of the hydraulic system. The hydraulic rotary cylinder is suitable for a certain range of environmental temperature and humidity. During use, it is necessary to ensure that the environment in which the cylinder is located meets its working requirements. If it needs to be used in extreme environments, appropriate protective measures or suitable cylinder models for the environment should be selected.

[0042] In summary, the use method of the hydraulic rotary cylinder described in this embodiment covers multiple aspects such as installation and connection, debugging and preparation, operation and use, maintenance and maintenance, and matters needing attention. By following these use methods, users can ensure that the cylinder operates efficiently and stably in various industrial application scenarios and prolongs its service life.

Claims

1. A hydraulic rotary cylinder characterized by: The cylinder-piston unit comprises a cylinder, a cylinder rod, an end cover, a piston and a rotary joint; the cylinder is straight and hollow, and has a flange end face at one end; the cylinder rod is arranged inside the cylinder and concentrically with the cylinder, and one end of the cylinder rod extends outside the cylinder, and the other end is fixedly connected with the piston; the end cover is arranged at the end of the cylinder and fixedly connected with the cylinder, and the end cover and the cylinder rod are sealed by a sealing ring; the outer edge of the piston is in sealing contact with the inside of the cylinder through a sealing ring, and the inside of the cylinder is divided into a rod cavity and a rodless cavity; the rotary joint comprises a core shaft and a shell, the core shaft is fixedly connected with the cylinder, and the shell is sleeved below the core shaft, and the shell and the core shaft are provided with an oil channel in communication, and the oil channel is in communication with the rod cavity and the rodless cavity; a sandwich oil channel in communication with the rod cavity is arranged in the cylinder.

2. The hydraulic rotary cylinder of claim 1, wherein: The shell of the rotary joint remains stationary, and the core shaft rotates synchronously with the cylinder.

3. The hydraulic rotary cylinder of claim 1, wherein: The sandwich oil channel is annular or spiral.

4. The hydraulic rotary cylinder of claim 1, wherein: Sealing structures are arranged at the inlet and outlet of the sandwich oil channel.

5. The hydraulic rotary cylinder of claim 1, wherein: Multiple sealing rings are arranged between the core shaft of the rotary joint and the cylinder.

6. The hydraulic rotary cylinder of claim 1, wherein: Sealing structures are arranged between the end cover and the cylinder.

7. The hydraulic rotary cylinder of claim 1, wherein: The cylinder is composed of an outer layer and an inner layer arranged in a sleeved manner.

8. The hydraulic rotary cylinder of claim 7, wherein: The sandwich oil channel is arranged between the outer layer and the inner layer.

Images