Two-stage oil cylinder follow-up oil line in a confined space and arrangement method thereof

Abstract

The application discloses a two-stage oil cylinder follow-up oil line pipeline in a limited space, which comprises a secondary oil cylinder rotatably arranged in a mechanism frame body; two primary cylinder pipelines arranged on the mechanism frame body and respectively in movable communication with primary cylinder oil ports of the secondary oil cylinder; and two secondary cylinder follow-up pipelines arranged on the mechanism frame body and respectively in communication with secondary cylinder oil ports of the secondary oil cylinder. The application realizes follow-up of the oil line pipeline during the composite movement of the large-stroke oil cylinder in the limited space, thereby effectively avoiding the mutual extrusion, interference or excessive curvature of the oil pipes at the joint end in the limited space, and has the beneficial effects of guaranteeing the transmission effect, guaranteeing the control precision and prolonging the service life.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel hydraulic technology. More specifically, this invention relates to a follow-up oil circuit pipeline for a two-stage hydraulic cylinder in a confined space and its arrangement method. Background Technology

[0002] Inside China's first jet wind tunnel test chamber, all four-degree-of-freedom mechanisms for changing the model's state are driven by hydraulic cylinders. Changing the angle of attack of the test model is achieved through an angle-of-attack mechanism. This mechanism mainly consists of a scissor mechanism, an arc-shaped guide rail, and a frame. The scissor mechanism is independently driven by a two-stage sleeve servo cylinder, causing it to slide along the arc-shaped guide rail on the side wall of the frame, thus changing the angle of attack of the test model mounted on the scissor assembly. However, due to the limited space within the wind tunnel test chamber and the overall structural characteristics of the motion mechanism, the installation space for the scissor mechanism's drive cylinder is limited. The movement of the scissor mechanism along the guide rail, thereby changing the model's angle of attack, is translated into motion by the drive cylinder. The drive cylinder's motion is essentially a two-dimensional planar composite motion within a narrow space. This motion can be decomposed into linear extension and retraction along the wind tunnel axis (defined as the X-axis) and fan-shaped oscillation on a vertical surface (defined as the Y-axis). When the mechanism changes to a positive angle of attack, the secondary oil pipe of the angle-of-attack cylinder is stretched in the X direction and gradually moves downward in the Y direction; when the mechanism changes to a negative angle of attack, the secondary oil pipe of the angle-of-attack cylinder retracts with the cylinder in the X direction and the space in the Y direction gradually increases.

[0003] To ensure the stable operation of the high-pressure hose of the angle-of-attack secondary cylinder, with redundant length, within the confined frame of the angle-of-attack mechanism during combined Y-axis and X-axis motions—that is, to ensure the hydraulic lines of the secondary cylinder can extend or retract in an orderly manner with the movement of the angle-of-attack mechanism without mutual compression, interference, or excessive curvature at the joints—special attention must be paid to the arrangement of the hydraulic lines, particularly those of the secondary cylinder, within the confined space. Therefore, how to achieve the follow-up movement of the hydraulic lines during the combined motion of a large-stroke cylinder within a limited space is a problem to be solved in this technical field. Summary of the Invention

[0004] One object of the present invention is to solve at least the above-mentioned problems and / or defects, and to provide at least the advantages described below.

[0005] In order to achieve these objectives and other advantages of the present invention, a follow-up oil circuit for a two-stage hydraulic cylinder in a confined space is provided, including a two-stage hydraulic cylinder rotatably disposed within a mechanism frame.

[0006] Two primary cylinder pipelines are provided on the mechanism frame, and the two primary cylinder pipelines are movably connected to the primary cylinder oil port of the secondary cylinder.

[0007] Two secondary cylinder follower pipelines are installed on the mechanism frame, and the two secondary cylinder follower pipelines are respectively connected to the secondary cylinder oil port of the secondary oil cylinder.

[0008] Preferably, the primary cylinder pipeline includes:

[0009] A primary rigid conduit is fixedly connected to the frame of the mechanism;

[0010] A high-pressure hose, one end of which is connected to the primary rigid pipeline via a pipe connector, and the other end of which is connected to the primary cylinder oil port.

[0011] Preferably, the secondary cylinder follower pipeline includes:

[0012] A secondary rigid pipeline is fixedly connected to the frame of the mechanism, and the output port of the secondary rigid pipeline is set corresponding to the starting point of the stroke of the secondary hydraulic cylinder;

[0013] A rigid follower pipe has one end connected to the oil port of the secondary cylinder, and the rigid follower pipe is close to the outer wall of the primary cylinder of the secondary cylinder.

[0014] The follower hose has one end connected to the other end of the follower rigid tubing via a rotating assembly, and the other end of the follower hose is connected to the secondary rigid tubing.

[0015] Preferably, the rotating assembly includes:

[0016] A right-angle adapter pipe, one end of which is connected to the servo rigid pipe;

[0017] A rotary joint, one end of which is connected to the other end of the right-angle adapter, and the other end of the rotary joint is connected to the follower hose.

[0018] Preferably, the length of the follow-up rigid pipeline is less than or equal to 1 / 2 of the maximum stroke of the secondary cylinder.

[0019] A method for arranging the follow-up hydraulic circuit pipeline of a two-stage hydraulic cylinder in a confined space includes the following steps:

[0020] Step 1: Connect two primary rigid pipes to the oil port of the primary cylinder corresponding to the two-stage hydraulic cylinder on the mechanism frame; connect two secondary rigid pipes to the stroke start point of the secondary cylinder on the mechanism frame.

[0021] Step 2: Connect the rotating assembly to one end of each of the two follower rigid pipes, and connect the other end of each of the two follower rigid pipes to the oil port of the second stage cylinder of the two-stage hydraulic cylinder.

[0022] Step 3: Determine the length of the two high-pressure hoses, and connect one end of each high-pressure hose to one of the two primary rigid pipelines, and connect the other end of each high-pressure hose to the primary cylinder oil port.

[0023] Step 4: Identify two follower hoses and connect one end of each follower hose to a two follower rigid pipe via a rotating assembly. Connect the other end of each follower hose to the oil port of the second-stage cylinder.

[0024] Preferably, the method for determining the length of the high-pressure hose is as follows:

[0025] Measure the distance from the output port of the first-stage rigid pipeline to the oil port of the first-stage cylinder to obtain the length distance d1. Determine the bending radius R1 of the high-pressure hose. The bending radius R1 of the high-pressure hose is greater than 10 times the diameter R2 of the high-pressure hose. Construct an isosceles triangle with d1 as the base and the bending radius R1 as the height to obtain the length D1 of the high-pressure hose curve segment.

[0026] Measure the chord length D2 from the rotation connection center of the second-stage hydraulic cylinder to the oil port of the first-stage cylinder;

[0027] The connection has a reserved redundancy D3, which is 6 times the pipe diameter R2;

[0028] The length of the high-pressure hose is L1 = (D1 + D2 + D3) * (100 + 2)%, where 2% is the shrinkage of the high-pressure hose after it is under pressure.

[0029] Preferably, the method for determining the length of the follower hose is as follows:

[0030] Measure the maximum distance D4 from port A of the secondary rigid piping to port B of the follow-up rigid piping;

[0031] When the secondary cylinder is at its maximum displacement stroke, the front section of the follower hose is a semi-ellipse S1. The minor axis of the semi-ellipse is R3, and the major axis is R4. The minor axis R3 is greater than 10 times the diameter of the follower hose R5. S1 = πR3 + 2(R4 - R3).

[0032] The minor axis of the semi-ellipse is 2R3, and the angle between the minor axis 2R3 and D4 is Θ. The straight segment of the following flexible tube...

[0033] The connection has a reserved redundancy S3, which is 6 times the diameter of the follower hose R5;

[0034] The length of the follower hose L2 = (S1 + S2 + S3) * (100 + 2)%, where 2% is the amount of shrinkage of the follower hose after being subjected to pressure.

[0035] The present invention has at least the following beneficial effects:

[0036] Firstly, this invention enables the oil pipeline to follow the movement of the large-stroke hydraulic cylinder during compound motion within a limited space, thereby effectively avoiding the phenomenon of oil pipes squeezing and interfering with each other in the confined space or the excessive curvature of the oil pipe at the joint end. It has the beneficial effects of ensuring transmission effect, ensuring control accuracy, and extending service life.

[0037] Secondly, in this invention, the connection angle between the follower rigid pipe and the follower flexible pipe is adjusted by a right-angle adapter to ensure that after the follower flexible pipe is connected to the rotary joint, the rotary joint can rotate with the compound operation of the secondary oil cylinder. This ensures the stability of the connection between the follower flexible pipe and the follower rigid pipe through the rotary joint, preventing the follower flexible pipe from detaching and being damaged. This has the advantages of ensuring connection stability and extending service life.

[0038] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the present invention.

[0040] Figure 2 This is a side view of the present invention.

[0041] Figure 3 This is a partially enlarged schematic diagram of the present invention.

[0042] Figure 4 This is a schematic diagram of the connection of the secondary cylinder follower pipeline of the present invention.

[0043] Figure 5 This is a schematic diagram of the rotating component connection of the present invention.

[0044] Figure 6 This is a schematic diagram of the high-pressure hose posture of the present invention.

[0045] Figure 7 This is a schematic diagram of the posture of the follower hose during the maximum stroke of the two-stage hydraulic cylinder of the present invention. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0047] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0048] It should be noted that in the description of this invention, the orientations or positional relationships indicated by terms are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Furthermore, in this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] Figure 1 One implementation of the present invention is shown, which includes a secondary hydraulic cylinder 2 rotatably disposed within the mechanism frame 1;

[0052] Two primary cylinder lines 3 are provided on the mechanism frame 1, and the two primary cylinder lines 3 are movably connected to the primary cylinder oil port of the secondary cylinder 2 respectively.

[0053] Two secondary cylinder follower lines 4 are installed on the mechanism frame 1, and the two secondary cylinder follower lines 4 are respectively connected to the secondary cylinder oil port of the secondary cylinder 2.

[0054] Working Principle: When the secondary cylinder 2 performs a fan-shaped oscillation during transmission, the primary cylinder pipeline 3 is movably connected to the primary cylinder oil port, allowing the primary cylinder pipeline 3 to move with the fan-shaped oscillation of the secondary cylinder, ensuring the hydraulic oil supply to the primary cylinder. During the combined extension and fan-shaped oscillation motion of the secondary cylinder 2, the secondary cylinder follower pipeline 4 extends or retracts in an orderly manner with the combined motion of the secondary cylinder 2, effectively preventing the secondary cylinder oil lines from mutually squeezing or interfering within the confined space, or from exhibiting excessive curvature at the joint end of the oil pipe, thus ensuring the hydraulic oil supply to the secondary cylinder. This technical solution achieves the follow-up movement of the oil lines during the combined motion of a large-stroke cylinder within a confined space, effectively avoiding mutual squeezing or interference of oil pipes within the confined space, or excessive curvature at the joint end of the oil pipe. It has the beneficial effects of ensuring transmission efficiency, ensuring control accuracy, and extending service life.

[0055] As described above, the first-stage cylinder pipeline 3 includes:

[0056] A primary rigid conduit 31 is fixedly connected to the frame 1 of the mechanism;

[0057] The high-pressure hose 32 has one end connected to the primary rigid pipeline 31 via a pipeline connector, and the other end connected to the primary cylinder oil port.

[0058] Working principle: When the secondary cylinder 2 swings in a fan shape during transmission, hydraulic oil is supplied to the primary cylinder of the secondary cylinder 2 through the high-pressure hose 32. At the same time, the high-pressure hose 32 moves with the fan-shaped swing of the secondary cylinder 2, ensuring the connection between the primary rigid pipeline 31 and the primary cylinder. This has the advantages of ensuring follow-up and transmission effect.

[0059] As described above, the secondary cylinder follower pipeline 4 includes:

[0060] A secondary rigid pipeline 41 is fixedly connected to the mechanism frame 1, and the output port of the secondary rigid pipeline 41 is set corresponding to the starting point of the stroke of the secondary hydraulic cylinder 2;

[0061] The rigid follower pipe 42 has one end connected to the oil port of the secondary cylinder, and the rigid follower pipe 42 is close to the outer wall of the primary cylinder of the secondary cylinder.

[0062] The follower hose 43 has one end connected to the other end of the follower rigid pipe 42 via a rotating assembly 44, and the other end of the follower hose 43 is connected to the secondary rigid pipe 41.

[0063] Working principle: When the secondary cylinder 2 performs a combined extension and fan-shaped oscillation motion, hydraulic oil enters the follower hose 43 through the secondary rigid pipe 41, and then enters the secondary cylinder of the secondary cylinder 2 through the follower rigid pipe 42. The secondary rigid pipe 41 restricts the movement of one end of the follower hose 43, while the follower rigid pipe 42 drives the other end of the follower hose 43 to move. Through the rotating component 44, the angle of the connection of the follower hose 43 is adjusted according to the combined motion of the secondary cylinder 2, preventing the connection of the follower hose 43 from detaching and being damaged. This allows the follower hose 43 to extend or retract in an orderly manner with the combined motion of the secondary cylinder 2. Furthermore, the follower rigid pipe 42 shortens the distance between the port of the secondary rigid pipe 41 and the oil port of the secondary cylinder, greatly reducing the required length of the follower hose 43. This effectively avoids the oil pipes from squeezing and interfering with each other in the confined space, or the phenomenon of excessive curvature of the oil pipe at the joint end. It has the advantages of ensuring transmission effect and extending service life.

[0064] As described above, the rotating component 44 includes:

[0065] A right-angle adapter pipe 441, one end of which is connected to the following rigid pipe 42;

[0066] Rotary joint 442, one end of which is connected to the other end of the right-angle adapter 441, and the other end of the rotary joint 442 is connected to the follower hose 43.

[0067] Working principle: The connection angle between the follower rigid pipe 42 and the follower flexible pipe 43 is adjusted by the right-angle adapter pipe 441 to ensure that after the follower flexible pipe 43 is connected to the rotary joint 442, the rotary joint 441 can rotate with the compound operation of the secondary oil cylinder 2. Thus, the rotary joint 442 ensures the stability of the connection between the follower flexible pipe 43 and the follower rigid pipe 42, and prevents the follower flexible pipe 43 from detaching and being damaged. It has the advantages of ensuring connection stability and extending service life.

[0068] In the above scheme, the length of the follower rigid pipe 42 is less than or equal to 1 / 2 of the maximum stroke of the secondary cylinder 2. By limiting the length of the follower rigid pipe 42, the stability of the connection between the follower rigid pipe 42 and the secondary cylinder oil port is ensured, preventing the connection from bearing a large load due to excessive length of the follower rigid pipe 42. Furthermore, by limiting the length of the follower rigid pipe 42, the optimal length of the follower hose 43 is ensured.

[0069] Example:

[0070] Step 1: Connect two primary rigid pipes to the oil port of the primary cylinder corresponding to the two-stage hydraulic cylinder on the mechanism frame; connect two secondary rigid pipes to the stroke start point of the secondary cylinder on the mechanism frame.

[0071] Step 2: Connect the rotating assembly to one end of each of the two follower rigid pipes, and connect the other end of each of the two follower rigid pipes to the oil port of the second stage cylinder of the two-stage hydraulic cylinder.

[0072] Step 3: Measure the length d1 from the output port of the first-stage rigid pipeline to the oil port of the first-stage cylinder. The diameter R2 of the high-pressure hose is 25mm. Set the bending radius R1 of the high-pressure hose to 450mm. Construct an isosceles triangle with d1 as the base and the bending radius R1 as the height. The length D1 of the curved section of the high-pressure hose is 933mm.

[0073] The chord length D2 from the rotation connection center of the second-stage hydraulic cylinder to the oil port of the first-stage cylinder is measured to be 450mm.

[0074] The connection has a reserved redundancy of 150mm (6 times the pipe diameter R2);

[0075] Adding D1, D2, and D3 together, and then adding the 2% shrinkage after the high-pressure hose is under pressure, we get the length of the high-pressure hose as 1563mm.

[0076] One end of each of the two 1563mm long high-pressure hoses is connected to one of the two primary rigid pipelines, and the other end of each of the two high-pressure hoses is connected to the primary cylinder oil port.

[0077] Step 4: Measure the maximum distance D4 from port A of the secondary rigid conduit to port B of the follow-up rigid conduit; it is 1088 mm.

[0078] When the secondary cylinder is at its maximum displacement stroke, the front section of the follower hose is a semi-ellipse S1. The diameter of the follower hose R5 is 25mm. The minor axis R3 of the semi-ellipse is set to 400mm and the major axis R4 is set to 700mm. The length of the semi-ellipse S1 is 1856mm using the formula S1=πR3+2(R4-R3).

[0079] The minor axis of the semi-ellipse is 800 mm, and the angle Θ between the minor axis and D4 is 37.5°.

[0080] From the formula The straight section S2 of the follower hose is found to be 665 mm;

[0081] The connection has a reserved redundancy of 150mm, which is 6 times the diameter of the follower hose R4;

[0082] Adding S1, S2, and S3 together, and then adding the 2% shrinkage of the follower hose after it is under pressure, we get the length of the follower hose as 2725mm.

[0083] Two 2725mm long follower hoses are connected at one end to two follower rigid pipes via a rotating assembly, and the other end of the two follower hoses is connected to the oil port of the second stage cylinder.

[0084] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A follow-up hydraulic pipeline for a two-stage hydraulic cylinder in a confined space, comprising a two-stage hydraulic cylinder rotatably mounted within a mechanism frame, characterized in that: Two primary cylinder pipelines are provided on the mechanism frame, and the two primary cylinder pipelines are movably connected to the primary cylinder oil port of the secondary cylinder. Two secondary cylinder follower pipelines are installed on the mechanism frame, and the two secondary cylinder follower pipelines are respectively connected to the secondary cylinder oil port of the secondary oil cylinder; The primary cylinder pipeline includes: A primary rigid conduit is fixedly connected to the frame of the mechanism; A high-pressure hose, one end of which is connected to the primary rigid pipeline via a pipe connector, and the other end of which is connected to the primary cylinder oil port; The secondary cylinder follow-up pipeline includes: A secondary rigid pipeline is fixedly connected to the frame of the mechanism, and the output port of the secondary rigid pipeline is set corresponding to the starting point of the stroke of the secondary hydraulic cylinder; A rigid follower pipe has one end connected to the oil port of the secondary cylinder, and the rigid follower pipe is close to the outer wall of the primary cylinder of the secondary cylinder. The follower hose has one end connected to the other end of the follower rigid tubing via a rotating assembly, and the other end of the follower hose is connected to the secondary rigid tubing.

2. The follow-up oil circuit pipeline for a two-stage hydraulic cylinder in a confined space according to claim 1, characterized in that, The rotating component includes: A right-angle adapter pipe, one end of which is connected to the servo rigid pipe; A rotary joint, one end of which is connected to the other end of the right-angle adapter, and the other end of the rotary joint is connected to the follower hose.

3. The follow-up oil circuit pipeline for a two-stage hydraulic cylinder in a confined space according to claim 1, characterized in that, The length of the follow-up rigid pipeline is less than or equal to 1 / 2 of the maximum stroke of the secondary cylinder.

4. A method for arranging the follow-up oil circuit pipeline of a two-stage hydraulic cylinder in a confined space according to any one of claims 1 to 3, characterized in that, Includes the following steps: Step 1: Connect two primary rigid pipes to the oil port of the primary cylinder corresponding to the two-stage hydraulic cylinder on the mechanism frame; connect two secondary rigid pipes to the stroke start point of the secondary cylinder on the mechanism frame. Step 2: Connect the rotating assembly to one end of each of the two follower rigid pipes, and connect the other end of each of the two follower rigid pipes to the oil port of the second stage cylinder of the two-stage hydraulic cylinder. Step 3: Determine the lengths of the two high-pressure hoses, and connect one end of each high-pressure hose to one of the two primary rigid pipelines, and the other end of each high-pressure hose to the primary cylinder oil port. Step 4: Identify two follower hoses and connect one end of each follower hose to a two follower rigid pipe via a rotating assembly. Connect the other end of each follower hose to the oil port of the second-stage cylinder.

5. The method for arranging the follow-up oil circuit pipeline of a two-stage hydraulic cylinder in a confined space according to claim 4, characterized in that, The method for determining the length of a high-pressure hose is as follows: Measure the distance from the output port of the first-stage rigid pipeline to the oil port of the first-stage cylinder to obtain the length distance d1. Determine the bending radius R1 of the high-pressure hose. The bending radius R1 of the high-pressure hose is greater than 10 times the diameter R2 of the high-pressure hose. Construct an isosceles triangle with d1 as the base and the bending radius R1 as the height to obtain the length D1 of the high-pressure hose curve segment. Measure the chord length D2 from the rotation connection center of the second-stage hydraulic cylinder to the oil port of the first-stage cylinder; The connection has a reserved redundancy D3, which is 6 times the pipe diameter R2; The length of the high-pressure hose is L1 = (D1 + D2 + D3) * (100 + 2)%, where 2% is the amount of shrinkage of the high-pressure hose after it is under pressure.

6. The method for arranging the follow-up oil circuit pipeline of a two-stage hydraulic cylinder in a confined space according to claim 4, characterized in that, The method for determining the length of the follower hose is as follows: Measure the maximum distance D4 from port A of the secondary rigid piping to port B of the follow-up rigid piping; When the secondary cylinder is at its maximum displacement stroke, the front section of the follower hose is a semi-ellipse S1. The minor axis of the semi-ellipse is R3, and the major axis is R4. The minor axis R3 is greater than 10 times the diameter of the follower hose R5. S1 = πR3 + 2(R4 - R3). The minor axis of the semi-ellipse is 2R3, and the angle between the minor axis 2R3 and D4 is Θ. The straight segment S2 of the following flexible tube is... ; The connection has a reserved redundancy S3, which is 6 times the diameter of the follower hose R5; The length of the follower hose L2 is calculated as (S1+S2+S3)*(100+2)%, where 2% is the amount of shrinkage of the follower hose after it is under pressure.

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