A multi-stage telescopic hydraulic oil pipe and motion platform

Abstract

The present invention belongs to the technical field related to hydraulic components, and discloses a multi-stage telescopic hydraulic oil pipe and a motion platform, comprising a rear end cover, a cylinder barrel, a primary piston, a secondary piston, a primary piston rod, a primary core tube, a secondary piston rod, an intermediate core tube and a front end cover, wherein the rear end cover and the front end cover are respectively connected to the two ends of the cylinder barrel; the primary piston is arranged in the cylinder barrel, and one end of the primary piston rod passes through the front end cover and is fixedly connected to the primary piston; the primary core tube is received in the primary piston rod and is fixedly connected to the primary piston; the secondary piston is sleeved on the primary core tube and is received in the primary piston rod; one end of the secondary piston rod passes through one end of the primary piston rod away from the primary piston and then extends into the primary piston rod and is fixedly connected to the secondary piston; the secondary piston rod is sleeved on the primary core tube; one end of the intermediate core tube is received in the primary core tube, and the other end passes through the primary piston and is fixedly connected to the rear end cover. The present invention can meet the requirements of small space installation and large stroke motion platform.

Description

Technical Field

[0001] The present invention belongs to the technical field related to hydraulic components, and more specifically, relates to a multi-stage telescopic hydraulic oil pipe and a motion platform. Background Art

[0002] Traditional hydraulic system oil pipes can be divided into hard pipes and soft pipes, whose functions are to transport high-pressure and return hydraulic oil to transmit flow and pressure. Among them, hard pipes are usually metal pipes, which have relatively high pressure resistance and long service life. However, since they are metal pipes, they are fixed after construction and cannot be moved; soft pipes are usually pipes made of metal mesh and rubber and other materials. Since rubber and other materials are relatively soft, soft pipes have a certain bending ability. Therefore, after installation, the two ends of the pipe can move within a certain range. However, since the pipes will deform back and forth during movement, fatigue damage is easily caused, which leads to pipe failure.

[0003] Regarding the oil supply problem of a moving platform with a large range of motion, the use of a hose for oil supply can be used as one of the alternative solutions, but its easy fatigue damage leads to its short life. On the other hand, due to the presence of high-pressure hydraulic oil in the pipeline and the net effective area of ​​the oil on the platform is not 0, the moving platform will be affected by the force of the hydraulic oil when the oil is supplied to the moving platform, introducing additional interference force to the system. To solve this problem, one of the existing technical means is a balanced telescopic oil pipe, which designs the oil pipe in the form of a hydraulic cylinder, supplies oil to the moving platform through a hollow piston rod, and designs the annular area of ​​the piston rod to be equal to the area of ​​the hollow part of the piston rod, so that the force of the pipeline on the mobile platform is 0. However, for some occasions with a wider range of motion and a smaller installation space in the initial state, the balanced telescopic oil pipe still cannot meet this use requirement.

[0004] Therefore, in response to the above needs, a telescopic oil pipe with a small installation space, that is, a short retracted length, a long extended length, and no additional load force introduced into the system is designed. This has very important significance and engineering application value for the oil supply of large-stroke and small-space mobile platforms. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a multi-stage telescopic hydraulic oil pipe, wherein the area of ​​the circular cross section formed by the outer diameter of the first-stage core tube of the oil pipe is equal to the annular area formed by the outer diameter of the second-stage piston and the second-stage piston rod, and the sum of the annular areas formed by the outer diameter of the first-stage core tube and the inner diameter of the intermediate core tube and the first-stage piston and the first-stage piston rod is equal to the annular area formed by the outer diameter of the second-stage piston and the second-stage piston rod, so that the thrust generated by the oil pressure of each stage of the multi-stage telescopic hydraulic oil pipe during the movement is 0, thereby not introducing additional load force to the motion platform. At the same time, due to the existence of the two-stage piston rod, the maximum length of the telescopic oil pipe when extended can reach three times that when fully retracted, greatly reducing the initial size and axial installation space.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, a multi-stage telescopic hydraulic oil pipe is provided, the oil pipe comprises a rear end cover, a cylinder barrel, a primary piston, a secondary piston, a primary piston rod, a primary core tube, a secondary piston rod, an intermediate core tube and a front end cover, the cylinder barrel is cylindrical, the rear end cover and the front end cover are respectively connected to the two opposite ends of the cylinder barrel; the primary piston is arranged in the cylinder barrel, one end of the primary piston rod passes through the front end cover and then extends into the cylinder barrel and is fixedly connected to the primary piston; the primary core tube is accommodated in the primary piston rod, and one end thereof is fixedly connected to the primary piston; the secondary piston is sleeved on the primary core tube and accommodated in the primary piston rod; one end of the secondary piston rod passes through the primary piston rod away from one end of the primary piston and then extends into the primary piston rod and is fixedly connected to the secondary piston; the secondary piston rod is sleeved on the primary core tube; one end of the intermediate core tube is accommodated in the primary core tube, and the other end passes through the primary piston and then is fixedly connected to the rear end cover.

[0007] Furthermore, the first-stage piston, the second-stage piston, the first-stage piston rod, the first-stage core tube, the second-stage piston rod, and the intermediate core tube are all hollow structures.

[0008] Furthermore, the outer diameter of the primary core tube is d3, the outer diameter of the secondary piston rod is d5, and the outer diameter of the secondary piston is d6. The three should satisfy d3 2 =d6 2 -d5 2 .

[0009] Furthermore, the outer diameter of the intermediate core tube is d1, the inner diameter of the secondary piston rod is d3, the outer diameter of the secondary piston rod is d5, the outer diameter of the secondary piston is d6, the outer diameter of the primary piston rod is d7, and the outer diameter of the primary piston is d8. The four should satisfy d3 2 -d1 2 +d8 2 -d7 2 =d62 -d5 2 .

[0010] Further, the cylinder is formed with a receiving cavity; the intermediate core tube is formed with a first through hole, and the first-level core tube is formed with a second through hole; the first-level piston is provided with a third through hole; one end of the first-level piston rod is provided with a first countersunk hole, and the bottom surface of the first countersunk hole is provided with a fourth through hole; the second-level piston is provided with a fifth through hole; one end of the second-level piston rod is provided with a second countersunk hole, and the bottom surface of the second countersunk hole is provided with an oil outlet hole H.

[0011] Furthermore, the rear end cover is provided with an oil inlet, which is communicated with the first through hole; the cylinder barrel is also provided with an exhaust hole, which is communicated with the accommodating cavity.

[0012] Furthermore, the first-stage piston is arranged in the receiving chamber, and the intermediate core tube is received in the receiving chamber, the third through hole, and the second through hole; the first-stage piston is provided with a plurality of first-stage piston exhaust holes, and the plurality of first-stage piston exhaust holes are evenly arranged around the central axis of the first-stage piston; the first-stage piston exhaust hole is connected to the receiving chamber and the first countersunk hole.

[0013] Furthermore, a secondary piston rod oil supply hole is opened in the area adjacent to the secondary piston, and the secondary piston rod oil supply hole is connected to the first counterbore and the second counterbore; an intermediate core tube oil supply hole is opened in the intermediate core tube, and the intermediate core tube oil supply hole is connected to the first through hole and the second through hole.

[0014] Furthermore, a cylinder oil supply hole is opened in the area of ​​the cylinder adjacent to the front end cover, and the cylinder oil supply hole is connected to the accommodating cavity; a first-level core tube oil supply hole is opened at one end of the first-level core tube adjacent to the front end cover, and the first-level core tube oil supply hole is connected to the first through hole and the second countersunk hole.

[0015] The present invention also provides a motion platform, wherein the oil pipe of the motion platform is the multi-stage telescopic hydraulic oil pipe as described above.

[0016] In general, compared with the prior art, the multi-stage telescopic hydraulic oil pipe and motion platform provided by the present invention have the following beneficial effects:

[0017] 1. The hydraulic oil pipe includes a cylinder and a two-stage piston rod, and its maximum extension length is three times the retracted length, so it can meet the requirements of small space installation and large stroke motion platform.

[0018] 2. The area of ​​the circular cross-section enclosed by the outer diameter of the primary core tube is equal to the annular area formed by the outer diameters of the secondary piston and secondary piston rod, so that the resultant force of the hydraulic oil acting on the secondary piston rod during movement is 0, thereby making the push and pull force of the secondary piston rod on the platform 0.

[0019] 3. The sum of the annular area formed by the outer diameter of the first-stage core tube and the inner diameter of the middle core tube and the annular area formed by the first-stage piston and the first-stage piston rod is equal to the annular area formed by the outer diameter of the second-stage piston and the second-stage piston rod, so that the resultant force of the hydraulic oil acting on the first-stage piston rod during the movement is 0, so that the active interference force of the multi-stage hydraulic telescopic oil pipe on the motion platform and the frame is 0.

[0020] 4. By setting the circular area enclosed by the outer diameter of the first-level core tube to be equal to the annular area formed by the outer diameters of the second-level piston and the second-level piston, and setting the sum of the annular areas enclosed by the outer diameter of the first-level core tube and the inner diameter of the intermediate core tube to be equal to the annular area enclosed by the first-level piston and the first-level piston rod, and the annular area formed by the outer diameters of the second-level piston and the second-level piston rod, the volume change of the hydraulic oil is 0 during the extension and retraction process, thereby ensuring the stability of the oil supply pressure of the motion platform.

[0021] 5. By designing the piston and piston rod structure, the primary and secondary moving parts are balanced, so that when the moving parts are supplied with oil through the multi-stage hydraulic telescopic oil pipe, no additional load force will be introduced. At the same time, the hydraulic oil pipe contains two-stage telescopic moving parts with a wide range of movement. In the process of conveying high-pressure hydraulic oil, no additional load force will be introduced, which is suitable for high-pressure oil delivery on a large range of moving platforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic cross-sectional view of a multi-stage telescopic hydraulic oil pipe.

[0023] In all the drawings, the same figure numbers are used to represent the same elements or structures, among which: 1-rear end cover, 2-cylinder barrel, 3-primary piston, 4-secondary piston, 5-primary piston rod, 6-primary core tube, 7-secondary piston rod, 8-intermediate core tube, 9-front end cover, A-oil inlet, B-exhaust hole, C-primary piston exhaust hole, D-secondary piston rod oil supply hole, E-intermediate core tube oil supply hole, F-cylinder barrel oil supply hole, G-primary core tube oil supply hole, H-oil outlet. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] See also Figure 1 The present invention provides a multi-stage telescopic hydraulic oil pipe, the oil pipe comprises a rear end cover 1, a cylinder 2, a primary piston 3, a secondary piston 4, a primary piston rod 5, a primary core tube 6, a secondary piston rod 7, an intermediate core tube 8 and a front end cover 9, the cylinder 2 is cylindrical, the rear end cover 1 and the front end cover 9 are respectively connected to the two opposite ends of the cylinder 2. The primary piston 3 is arranged in the cylinder 2, one end of the primary piston rod 5 passes through the front end cover 9 and then extends into the cylinder 2 and is fixedly connected to the primary piston 3. The primary core tube 6 is accommodated in the primary piston rod 5, and one end thereof is fixedly connected to the primary piston 3. The secondary piston 4 is sleeved on the primary core tube 6 and is accommodated in the primary piston rod 5. One end of the secondary piston rod 7 passes through one end of the primary piston rod 5 away from the primary piston 3 and then extends into the primary piston rod 5 and is fixedly connected to the secondary piston 4. The secondary piston rod 7 is sleeved on the primary core tube 6. One end of the intermediate core tube 8 is received in the primary core tube 6, and the other end passes through the primary piston 3 and is fixedly connected to the rear end cover 1. In this embodiment, the primary piston 3, the secondary piston 4, the primary piston rod 5, the primary core tube 6, the secondary piston rod 7, and the intermediate core tube 8 are all hollow structures to facilitate the passage of oil.

[0026] Among them, the rear end cover 1, the cylinder 2, the middle core tube 8 and the front end cover 9 constitute the fixed part of the oil pipe, the first-level piston 3, the first-level core tube 6 and the first-level piston rod 5 constitute the first-level moving component to complete the first-level telescopic movement; the second-level piston 4 and the second-level piston rod 7 constitute the second-level moving component to complete the second-level telescopic movement.

[0027] The cylinder barrel 2 is formed with a receiving cavity. The intermediate core tube 8 is formed with a first through hole, and the primary core tube 6 is formed with a second through hole. The primary piston 3 is provided with a third through hole. A first countersunk hole is provided at one end of the primary piston rod 5, and a fourth through hole is provided at the bottom of the first countersunk hole. The secondary piston 4 is provided with a fifth through hole. A second countersunk hole is provided at one end of the secondary piston rod 7, and an oil outlet hole H is provided at the bottom of the second countersunk hole. The rear end cover 1 is provided with an oil inlet A, and the oil inlet A is connected to the first through hole. The cylinder barrel 2 is also provided with an exhaust hole B, and the exhaust hole B is connected to the receiving cavity. The primary piston 3 is arranged in the receiving cavity. The intermediate core tube 8 is received in the receiving cavity, the third through hole, and the second through hole. The primary piston 3 is provided with a plurality of primary piston exhaust holes C, and the plurality of primary piston exhaust holes C are evenly arranged around the central axis of the primary piston 3. The primary piston exhaust hole C is connected to the receiving cavity and the first countersunk hole. The secondary piston rod 7 is provided with a secondary piston rod oil supply hole D in the area adjacent to the secondary piston 4, and the secondary piston rod oil supply hole D is connected to the first counterbore and the second counterbore. The intermediate core tube 8 is provided with an intermediate core tube oil supply hole E, and the intermediate core tube oil supply hole E is connected to the first through hole and the second through hole. The cylinder 2 is provided with a cylinder oil supply hole F in the area adjacent to the front end cover 9, and the cylinder oil supply hole F is connected to the receiving chamber. The primary core tube 6 is provided with a primary core tube oil supply hole G at one end adjacent to the front end cover 9, and the primary core tube oil supply hole G is connected to the first through hole and the second counterbore.

[0028] The outer peripheries of the end of the primary core tube 6 away from the primary piston 3 and the end of the intermediate core tube 8 away from the primary piston 3 are respectively provided with annular guide bosses, and copper sleeves are installed at the guide bosses to reduce friction.

[0029] The outer diameter of the primary core tube 6 is d3, the outer diameter of the secondary piston rod 7 is d5, and the outer diameter of the secondary piston 4 is d6. The three should satisfy d3. 2 =d6 2 -d5 2 , that is, the circular area enclosed by the outer diameter of the primary core tube is equal to the annular area formed by the outer diameter of the secondary piston and the secondary piston rod. The flow area of ​​the secondary piston rod oil replenishing hole D is not less than the flow area required by the pipeline.

[0030] The outer diameter of the intermediate core tube 8 is d1, the inner diameter of the secondary piston rod 7 is d3, the outer diameter of the secondary piston rod 7 is d5, the outer diameter of the secondary piston 4 is d6, the outer diameter of the primary piston rod 5 is d7, and the outer diameter of the primary piston 3 is d8. The four should satisfy d3 2 -d1 2 +d8 2 -d7 2 =d6 2-d5 2 That is, the sum of the annular area formed by the outer diameter of the primary core tube and the inner diameter of the intermediate core tube and the annular area formed by the primary piston and the primary piston rod is equal to the annular area formed by the outer diameter of the secondary piston and the secondary piston rod.

[0031] There is relative movement between the cylinder 2 and the primary piston 3, the intermediate core tube 8 and the primary piston 3, the primary core tube 6 and the secondary piston 4, the secondary piston 4 and the primary piston rod 5, the primary piston rod 5 and the front end cover 9, and the secondary piston rod 7 and the primary piston rod 5, all of which are sealed with Gly rings to reduce movement friction.

[0032] The circular area enclosed by the outer diameter of the primary core tube 6 is equal to the annular area formed by the outer diameters of the secondary piston 4 and the secondary piston rod 7; the sum of the annular areas enclosed by the outer diameter of the primary core tube 6 and the inner diameter of the intermediate core tube 8 and the annular area enclosed by the primary piston 3 and the primary piston rod 5 is equal to the annular area formed by the outer diameters of the secondary piston 4 and the secondary piston rod 7, so that the resultant force of the hydraulic oil acting on the primary piston rod and the secondary piston rod is 0, ensuring that the moving platform is not affected by the external force of the oil pipe; at the same time, there is no volume change of the hydraulic oil, ensuring the stability of the oil supply pressure.

[0033] Among them, the oil inlet A, the oil outlet H, and the cylinder oil filling hole F are working oil ports. The oil inlet A is directly connected to the oil outlet H and then connected to the required system hydraulic pipeline, serving as the oil inlet of the oil pipe; the oil outlet H is connected to the system pipeline and serves as the oil outlet of the oil pipe. The flow area of ​​the primary core tube oil filling hole G and the intermediate core tube oil filling hole E is not less than the flow area required by the pipeline.

[0034] When working, the oil inlet A and the oil outlet H are connected to the oil source and the platform equipment that needs oil supply respectively, the rear end cover is fixed on the frame, and the secondary piston rod is fixed to the mobile platform. When working, the mobile platform moves away from the frame, driving the secondary piston rod to move. After the secondary piston rod reaches the travel range, the primary piston rod extends until the platform moves to the end of the travel; conversely, when the mobile platform moves toward the frame, it drives the secondary piston rod to retract. After the secondary piston rod reaches the travel range, the primary piston rod retracts until the platform moves to the end of the travel. During the movement of the multi-stage telescopic hydraulic oil pipe, the hydraulic oil passes through the middle core tube, the primary core tube and the hollow primary and secondary piston rods to meet the hydraulic oil demand of the hydraulic equipment on the moving platform.

[0035] The present invention sets the circular area surrounded by the outer diameter of the first-level core tube to be equal to the annular area formed by the outer diameters of the second-level piston and the second-level piston, and the sum of the annular areas surrounded by the outer diameter of the first-level core tube and the inner diameter of the intermediate core tube and the first-level piston and the first-level piston rod and the annular area formed by the outer diameters of the second-level piston and the second-level piston rod is equal, thereby ensuring that the force exerted by the multi-stage telescopic oil pipe on the moving platform is only frictional force. At the same time, since the action areas of the moving parts on both ends of the telescopic oil pipe are equal, the volume of the working chamber filled with oil remains unchanged during the movement, thereby causing no pressure pulsation and impact on the hydraulic oil when the hydraulic oil is transported.

[0036] The present invention also provides a motion platform, wherein the oil pipe of the motion platform is the multi-stage telescopic hydraulic oil pipe as described above.

[0037] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage telescopic hydraulic oil pipe, characterized in that: The oil pipe comprises a rear end cover, a cylinder barrel, a primary piston, a secondary piston, a primary piston rod, a primary core tube, a secondary piston rod, an intermediate core tube and a front end cover, the cylinder barrel is cylindrical, the rear end cover and the front end cover are respectively connected to the two opposite ends of the cylinder barrel; the primary piston is arranged in the cylinder barrel, one end of the primary piston rod passes through the front end cover and then extends into the cylinder barrel and is fixedly connected to the primary piston; the primary core tube is accommodated in the primary piston rod, and one end thereof is fixedly connected to the primary piston; the secondary piston is sleeved on the primary core tube and accommodated in the primary piston rod; one end of the secondary piston rod passes through the primary piston rod away from one end of the primary piston and then extends into the primary piston rod and is fixedly connected to the secondary piston; the secondary piston rod is sleeved on the primary core tube; one end of the intermediate core tube is accommodated in the primary core tube, and the other end passes through the primary piston and then is fixedly connected to the rear end cover; The outer diameter of the primary core tube is d3, the outer diameter of the secondary piston rod is d5, and the outer diameter of the secondary piston is d6. The three should satisfy d3 2 =d6 2 -d5 2 The outer diameter of the intermediate core tube is d1, the inner diameter of the secondary piston rod is d3, the outer diameter of the secondary piston rod is d5, the outer diameter of the secondary piston is d6, the outer diameter of the primary piston rod is d7, and the outer diameter of the primary piston is d8. The four should meet d3 2 -d1 2 +d8 2 -d7 2 =d6 2 -d5 2 .

2. The multi-stage telescopic hydraulic oil pipe according to claim 1, characterized in that: The first-stage piston, the second-stage piston, the first-stage piston rod, the first-stage core tube, the second-stage piston rod, and the intermediate core tube are all hollow structures.

3. The multi-stage telescopic hydraulic oil pipe according to claim 1, characterized in that: The cylinder tube forms a receiving cavity; the intermediate core tube forms a first through hole, and the first-level core tube forms a second through hole; the first-level piston is provided with a third through hole; one end of the first-level piston rod is provided with a first countersunk hole, and the bottom surface of the first countersunk hole is provided with a fourth through hole; the second-level piston is provided with a fifth through hole; one end of the second-level piston rod is provided with a second countersunk hole, and the bottom surface of the second countersunk hole is provided with an oil outlet hole H.

4. The multi-stage telescopic hydraulic oil pipe according to claim 3, characterized in that: The rear end cover is provided with an oil inlet, which is communicated with the first through hole; the cylinder barrel is also provided with an exhaust hole, which is communicated with the accommodating cavity.

5. The multi-stage telescopic hydraulic oil pipe according to claim 4, characterized in that: The first-stage piston is arranged in the receiving chamber, and the intermediate core tube is received in the receiving chamber, the third through hole, and the second through hole; the first-stage piston is provided with a plurality of first-stage piston exhaust holes, and the plurality of first-stage piston exhaust holes are evenly arranged around the central axis of the first-stage piston; the first-stage piston exhaust hole is connected to the receiving chamber and the first countersunk hole.

6. The multi-stage telescopic hydraulic oil pipe according to claim 5, characterized in that: A secondary piston rod oil supply hole is opened in the area adjacent to the secondary piston, and the secondary piston rod oil supply hole is connected to the first counterbore and the second counterbore; an intermediate core tube oil supply hole is opened in the intermediate core tube, and the intermediate core tube oil supply hole is connected to the first through hole and the second through hole.

7. The multi-stage telescopic hydraulic oil pipe according to claim 6, characterized in that: A cylinder oil supply hole is opened in the area of ​​the cylinder adjacent to the front end cover, and the cylinder oil supply hole is connected to the accommodating cavity; a first-level core tube oil supply hole is opened at one end of the first-level core tube adjacent to the front end cover, and the first-level core tube oil supply hole is connected to the first through hole and the second countersunk hole.

8. A sports platform, characterized in that: The oil pipe of the motion platform is the multi-stage telescopic hydraulic oil pipe as described in any one of claims 1-7.

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