Underwater hydraulic cylinder experimental system simulating different depths

Abstract

The present invention provides an underwater hydraulic cylinder experimental system simulating different depths, including a pressure tank, end covers for sealing are provided at both ends of the pressure tank, a fixed support structure is provided inside the pressure tank for fixing the hydraulic cylinder; a sealing port is provided on the end cover, the sealing port is used for sealing and active connection with the piston rod of the hydraulic cylinder or the extension rod of the piston rod, so that the piston rod of the hydraulic cylinder or the extension rod of the piston rod can extend out of the end cover; the pressure tank or the end cover is also provided with a pressure regulating water inlet, which is used to supply pressure liquid into the pressure tank; the pressure tank or the end cover is also provided with an oil pipe sealing port and a cable sealing port, the oil pipe sealing port is used for the pressure oil pipe to pass through and connect with the hydraulic cylinder in a sealed manner, and the cable sealing port is used for the conductive cable to pass through in a sealed manner. By adopting the above structure, liquids of different pressures can be added through the pressure regulating water inlet, thereby simulating underwater working conditions, and the provided sensor can detect the working conditions of the hydraulic cylinder.

Description

Technical Field

[0001] The invention relates to the field of deep water experimental devices, in particular to an underwater hydraulic cylinder experimental system simulating different depths. Background Art

[0002] In underwater work, hydraulic cylinders in water are required to complete operating actions, such as driving underwater manipulators. When the water depth reaches 500-4000 meters, the pressure on the hydraulic cylinders in the water reaches about 5-40 MPa. At this time, the working state of the hydraulic cylinders is very different from that on the ground. After searching, no experimental device for simulating the working of hydraulic cylinders in deep water has been found. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an underwater hydraulic cylinder experimental system simulating different depths, which can simulate the working conditions of the hydraulic cylinder under different depths in water to assist the development of the underwater hydraulic cylinder.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an underwater hydraulic cylinder experimental system simulating different depths, comprising a pressure tank, end covers for sealing are arranged at both ends of the pressure tank, and a fixed support structure is arranged inside the pressure tank for fixing the hydraulic cylinder;

[0005] A sealing port is provided on the end cover, and the sealing port is used to be sealingly and movably connected with the piston rod of the hydraulic cylinder or the extension rod of the piston rod, so that the piston rod of the hydraulic cylinder or the extension rod of the piston rod extends out of the end cover;

[0006] The pressure tank or the end cover is also provided with a pressure regulating water inlet for supplying pressurized liquid into the pressure tank;

[0007] The pressure tank or the end cover is also provided with an oil pipe sealing port and a cable sealing port. The oil pipe sealing port is used for allowing the pressure oil pipe to pass through in a sealed manner and be connected to the hydraulic cylinder, and the cable sealing port is used for allowing the conductive cable to pass through in a sealed manner.

[0008] In a preferred solution, the piston rod is fixedly connected to the extension rod, and the outer diameter of the extension rod is the same as the outer diameter of the piston rod.

[0009] In a preferred solution, a switch rod is provided on the cylinder body of the hydraulic cylinder, a plurality of travel switches are provided on the switch rod, and a travel contact is provided on the piston rod, and the travel contact is used to trigger the travel switch.

[0010] In a preferred solution, a verification stroke sensor is further provided outside the end cover for verifying the stroke of the piston rod or an extension rod of the piston rod outside the end cover.

[0011] In the preferred scheme, the structure of the verification stroke sensor is that the friction wheel contacts the piston rod or the extension rod of the piston rod, and rotates with the extension and retraction of the piston rod or the extension rod of the piston rod. The friction wheel is connected to the synchronization plate through a transmission mechanism, and a photoelectric sensor is provided near the synchronization plate. The synchronization plate is provided with a texture for easy detection, and the photoelectric sensor is used to detect the rotation angle of the synchronization plate.

[0012] In a preferred solution, a pressure measuring exhaust valve is also provided near the top of the pressure tank or the end cover.

[0013] In a preferred solution, one end of the hydraulic cylinder away from the piston rod is fixedly connected to the end positioning support.

[0014] In a preferred solution, a stroke sensor is also provided in the hydraulic cylinder, and the cable of the stroke sensor is connected through a first cable sealing port provided on the end cover;

[0015] A pressure sensor port is also provided on the hydraulic cylinder for connecting the pressure sensor, and the cable of the pressure sensor is connected through the cable sealing port.

[0016] In a preferred solution, the structure of the pressure oil pipe is as follows: a plurality of support rings arranged along the axial direction are provided in the oil pipe layer, gaps are provided between the support rings, guide circles are provided at both ends of the support rings, and a connecting layer is provided between the support rings and the oil pipe layer.

[0017] In a preferred solution, the structure of the sealing port is as follows: a portion of the outer sealing cover penetrates the end cover and is connected to the end cover via a plurality of outer sealing bolts, and the outer wall of the outer sealing cover is sealed with the end cover via a first sealing ring;

[0018] The inner sealing cover is connected to the outer sealing cover via a plurality of inner sealing screws;

[0019] A spherical sleeve is provided between the inner sealing cover and the outer sealing cover, and the outer wall of the spherical sleeve is sealed with the outer sealing cover through a second sealing ring;

[0020] A through hole is provided at the center of the spherical sleeve, a self-tightening sealing ring is provided in the through hole, and the self-tightening sealing ring is movably and sealingly connected with the piston rod or an extension rod of the piston rod;

[0021] The self-tightening sealing ring is provided with a "V"-shaped opening, and the "V"-shaped opening faces the inner side of the end cover.

[0022] The present invention provides an underwater hydraulic cylinder experimental system simulating different depths. By adopting the above structure, it is possible to inject liquids of different pressures through the pressure regulating water inlet, thereby simulating underwater working conditions. The set sensors can detect the working conditions of the hydraulic cylinder. For example, the set verification stroke sensor can verify the working status of various stroke sensors in the hydraulic cylinder under different pressure conditions. The set sealing port can avoid pressure fluctuations caused by the expansion and contraction of the piston rod in the pressure tank. The structure of the set pressure oil pipe can overcome the pressure in the pressure tank without deformation when returning oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0024] Figure 1 It is a cross-sectional schematic diagram of the present invention.

[0025] Figure 2 for Figure 1 Schematic cross-sectional view of AA.

[0026] Figure 3 It is a partial enlarged schematic diagram of the sealing port of the present invention.

[0027] Figure 4 It is a front view of the second end cover of the present invention.

[0028] Figure 5 It is a partial cross-sectional schematic diagram of the pressure oil pipe of the present invention.

[0029] In the figure: axial fixing device 1, axial limiting rod 2, pressure tank 3, base 4, pressure measuring exhaust valve 5, lifting ear 6, first end cover 7, first cable sealing port 8, pressure regulating water inlet 9, connecting screw 10, stroke sensor joint 11, first liquid inlet 12, bottom fixed support 13, inclined member 131, V-shaped member 132, support seat 133, inclined steel wire rope 134, elastic pad 14, top suspension support 15, second liquid inlet 16, end positioning support 17, lubricating oil port 18, oil pipe sealing port 19, second cable sealing port 20, sealing port 2 1, inner sealing cover 211, outer sealing cover 212, outer sealing bolt 213, first sealing ring 214, second sealing ring 215, self-tightening sealing ring 216, ball sleeve 217, inner sealing screw 218, second end cover 22, switch rod 23, pressure oil pipe 24, oil pipe layer 241, connecting layer 242, support ring 243, travel switch 25, piston rod 26, travel contact 27, pressure sensor port 28, extension rod 29, hydraulic cylinder 30, verification travel sensor 31, friction wheel 311, photoelectric sensor 312, synchronization plate 313. DETAILED DESCRIPTION

[0030] Embodiment 1:

[0031] like Figure 1 , 2 4, an underwater hydraulic cylinder experimental system simulating different depths, comprising a pressure tank 3, both ends of the pressure tank 3 are provided with end covers for sealing, and a fixed support structure is provided inside the pressure tank 3 for fixing the hydraulic cylinder 30;

[0032] A sealing opening 21 is provided on the end cover, and the sealing opening 21 is used to be sealed and movably connected with the piston rod of the hydraulic cylinder 30 or the extension rod of the piston rod, so that the piston rod of the hydraulic cylinder 30 or the extension rod of the piston rod extends out of the end cover;

[0033] The pressure tank 3 or the end cover is also provided with a pressure regulating water inlet 9 for supplying pressurized liquid into the pressure tank 3;

[0034] The pressure tank 3 or the end cover is also provided with an oil pipe sealing port 19 and a cable sealing port. The oil pipe sealing port 19 is used for the pressure oil pipe 24 to pass through in a sealed manner and be connected to the hydraulic cylinder 30, and the cable sealing port is used for the conductive cable to pass through in a sealed manner. With this structure, the working condition of the hydraulic cylinder 30 under deep water conditions can be tested by filling the pressure medium from the pressure regulating water inlet 9. The provided sealing port 21 structure allows the piston rod or the extension rod of the piston rod to extend out of the end cover, which can prevent the expansion and contraction of the piston rod from causing pressure changes in the pressure tank 3 due to volume changes. The outside of the end cover mentioned here refers to the outside of the cavity of the pressure tank 3.

[0035] The preferred solution is Figure 1 In the embodiment, the piston rod is fixedly connected to the extension rod, and the outer diameter of the extension rod is the same as the outer diameter of the piston rod. With this structure, the volume change of the pressure tank 3 caused by the diameter change is avoided.

[0036] The preferred solution is Figure 1 In the embodiment, a switch rod 23 is provided on the cylinder body of the hydraulic cylinder 30, a plurality of travel switches 25 are provided on the switch rod 23, and a travel contact 27 is provided on the piston rod, and the travel contact 27 is used to trigger the travel switch 25. This structure is used to control the automatic reversing action of the hydraulic cylinder 30.

[0037] The preferred solution is Figure 1 , 3 In the embodiment, a verification stroke sensor 31 is provided outside the end cover to verify the stroke of the piston rod or the extension rod of the piston rod outside the end cover. With this structure, the error between the data of the stroke sensor provided in the hydraulic cylinder 30 and the actual stroke data of the extension rod under high water pressure conditions can be verified.

[0038] The preferred solution is Figure 3In the verification stroke sensor 31, the friction wheel 311 contacts the piston rod or the extension rod of the piston rod, and rotates with the extension and retraction of the piston rod or the extension rod of the piston rod. The friction wheel 311 is connected to the synchronous piece 313 through a transmission mechanism. A photoelectric sensor 312 is provided near the synchronous piece 313. The synchronous piece 313 is provided with a texture for easy detection. The photoelectric sensor 312 is used to detect the rotation angle of the synchronous piece 313. With this structure, the stroke of the piston rod can be measured more accurately and conveniently.

[0039] The preferred solution is Figure 1 In the embodiment, a pressure measuring exhaust valve 5 is also provided near the top of the pressure tank 3 or the end cover. This structure is used to discharge the gas in the pressure tank 3 and to measure the pressure in the pressure tank 3.

[0040] The preferred solution is Figure 1 In the embodiment, one end of the hydraulic cylinder 30 away from the piston rod 26 is fixedly connected to the end positioning support 17. This structure is used to fix the axial position of the hydraulic cylinder 30. In a preferred solution, the end positioning support 17 is fixedly connected to the inner wall of the pressure tank 3, and the end positioning support 17 is fixedly connected to the axial fixing device 1 through the axial limiting rod 2, and the axial fixing device 1 is connected to the end of the hydraulic cylinder 30 through a flange structure.

[0041] Further preferably, Figure 1 , 2 As shown in , a plurality of bottom fixed supports 13 are also provided. The bottom fixed supports 13 include a support seat 133 located at the bottom. The two ends of the support seat 133 are fixedly connected to the inner wall of the pressure tank 3. Two groups of horizontal angle steels are provided on the support seat 133 to form a V-shaped member 132. The V-shaped member 132 is located just on both sides of the hydraulic cylinder 30 to limit the rolling of the hydraulic cylinder 30. An inclined member 131 is also provided on the outside of the V-shaped member 132. The two ends of the inclined steel wire rope 134 are connected to the inclined member 131 by bolts. The inclined steel wire rope 134 bypasses the outer wall of the hydraulic cylinder 30. The inclined steel wire rope 134 is used to lock the hydraulic cylinder 30. A top suspension support 15 is also provided at the top position of the hydraulic cylinder 30 to press the hydraulic cylinder 30. An elastic pad 14 is also provided between the hydraulic cylinder 30 and the V-shaped member 132.

[0042] The preferred solution is Figure 1 In the embodiment, a stroke sensor is also provided in the hydraulic cylinder 30, and the cable of the stroke sensor is connected through a first cable sealing port 8 provided on the end cover; thus, the structure is used to measure the stroke of the hydraulic cylinder 30 under high water pressure conditions.

[0043] A pressure sensor port 28 is also provided on the hydraulic cylinder 30 for connecting a pressure sensor, and the cable of the pressure sensor is connected through the cable sealing port.

[0044] The preferred solution is Figure 5In the embodiment, the structure of the pressure oil pipe 24 is as follows: a plurality of support rings 243 arranged along the axial direction are provided in the oil pipe layer 241, gaps are provided between the support rings 243, guide circles are provided at both ends of the support rings 243, and a connecting layer 242 is provided between the support rings 243 and the oil pipe layer 241. Preferably, the support rings 243 are metal rings, and this structure can prevent the pressure oil pipe 24 from being flattened during the oil return process because the oil return pressure of the pressure oil pipe 24 is at normal pressure. The connecting layer 242 is made of heat shrinkable material, such as a polyethylene tube, and is used to maintain the gaps between the support rings 243.

[0045] The preferred solution is Figure 3 In the embodiment, the structure of the sealing port 21 is as follows: a portion of the outer sealing cover 212 penetrates the end cover and is connected to the end cover through a plurality of outer sealing bolts 213, and the outer wall of the outer sealing cover 212 is sealed with the end cover through a first sealing ring 214;

[0046] The inner sealing cover 211 is connected to the outer sealing cover 212 via a plurality of inner sealing screws 218;

[0047] A spherical sleeve 217 is provided between the inner sealing cover 211 and the outer sealing cover 212 , and the outer wall of the spherical sleeve 217 is sealed with the outer sealing cover 212 via the second sealing ring 215 ; with this structure, when subjected to the internal pressure of the pressure-resistant tank 3 , the sealing effect is better.

[0048] A through hole is provided at the center of the spherical sleeve 217, and a self-tightening sealing ring 216 is provided in the through hole. The self-tightening sealing ring 216 is movably and sealingly connected to the piston rod or an extension rod of the piston rod;

[0049] The self-tightening seal ring 216 is provided with a "V"-shaped opening, which faces the inner side of the end cover. With this structure, when the pressure in the pressure tank 3 is applied, the self-tightening seal ring 216 is pressed against the outer wall of the extension rod 29. With this structure, in addition to ensuring sealing, the motion error of the hydraulic cylinder 30 can also be compensated.

[0050] In a preferred solution, a drain hole is further provided at the bottom of the hydraulic cylinder 30, which is connected to the outside of the end cover through a drain pipe. The drain hole is communicated with the cavity of the hydraulic cylinder 30 for detecting the performance of the piston rod waterproof seal.

[0051] Embodiment 2:

[0052] On the basis of Example 1, when in use, assemble the pressure tank 3, install the extension rod 29, check the assembly condition to ensure there is no interference and the seal is well installed. Use an external booster pump to pump water into the pressure tank 3 from the pressure regulating water inlet 9, gradually increase the pressure to the preset pressure, for example, 10MPa, and maintain the pressure for 10 minutes without leakage. Connect various pipelines and circuits, and there is no leakage at each joint position. After unloading, in a waterless state, control the reciprocating motion of the piston rod 26 of the hydraulic cylinder 30 to measure the maximum stroke, detect whether the stroke switch 25 reacts, record the time of each reciprocating motion, verify that the stroke sensor 31 detects each error of the reciprocating stroke, and verify that the stroke sensor 31 detects whether there is an error in the built-in stroke sensor of the hydraulic cylinder 30. Detect the reciprocating motion time under no load, the reciprocating motion time under load, and record the pressure of the pressure sensor on the pressure tank 3, as well as the pressure of the pressure sensor on the hydraulic cylinder 30, especially the pressure at the return oil end. Increase the pressure gradually by 0.5MPa and repeat the above detection steps. Through the above detection, the working condition of the deep-water underwater hydraulic cylinder 30, as well as the movement of the hydraulic cylinder 30 and the influence on the sensor under the deep-water working condition can be evaluated.

[0053] The above-mentioned embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An underwater hydraulic cylinder experimental system simulating different depths, characterized by: It comprises a pressure-resistant tank (3), both ends of the pressure-resistant tank (3) are provided with end covers for sealing, and a fixed support structure is provided inside the pressure-resistant tank (3) for fixing the hydraulic cylinder (30); A sealing opening (21) is provided on the end cover, and the sealing opening (21) is used to be sealingly movably connected to a piston rod of a hydraulic cylinder (30) or an extension rod of the piston rod, so that the piston rod of the hydraulic cylinder (30) or the extension rod of the piston rod extends out of the end cover; The pressure-resistant tank (3) or the end cover is also provided with a pressure-regulating water inlet (9) for supplying pressurized liquid into the pressure-resistant tank (3); The pressure tank (3) or the end cover is also provided with an oil pipe sealing opening (19) and a cable sealing opening. The oil pipe sealing opening (19) is used for allowing the pressure oil pipe (24) to pass through in a sealed manner and be connected to the hydraulic cylinder (30), and the cable sealing opening is used for allowing the conductive cable to pass through in a sealed manner. A stroke sensor is also provided in the hydraulic cylinder (30), and a cable of the stroke sensor is connected through a first cable sealing opening (8) provided on the end cover; A pressure sensor port (28) is also provided on the hydraulic cylinder (30) for connecting to a pressure sensor, and a cable of the pressure sensor is connected through the cable sealing port; A verification stroke sensor (31) is also provided outside the end cover, for verifying the stroke of the piston rod or an extension rod of the piston rod outside the end cover; The structure of the verification stroke sensor (31) is that the friction wheel (311) contacts the piston rod or the extension rod of the piston rod and rotates with the extension and retraction of the piston rod or the extension rod of the piston rod. The friction wheel (311) is connected to the synchronous plate (313) through a transmission mechanism. A photoelectric sensor (312) is provided near the synchronous plate (313). The synchronous plate (313) is provided with a texture that is easy to detect. The photoelectric sensor (312) is used to detect the rotation angle of the synchronous plate (313).

2. The underwater hydraulic cylinder experimental system simulating different depths according to claim 1 is characterized by: The piston rod is fixedly connected to the extension rod, and the outer diameter of the extension rod is the same as the outer diameter of the piston rod.

3. The underwater hydraulic cylinder experimental system simulating different depths according to claim 1 is characterized by: A switch rod (23) is provided on the cylinder body of the hydraulic cylinder (30), a plurality of travel switches (25) are provided on the switch rod (23), and a travel contact (27) is provided on the piston rod, the travel contact (27) being used to trigger the travel switch (25).

4. The underwater hydraulic cylinder experimental system simulating different depths according to claim 1 is characterized by: A pressure measuring exhaust valve (5) is also provided near the top of the pressure tank (3) or the end cover.

5. The underwater hydraulic cylinder experimental system simulating different depths according to claim 1 is characterized by: One end of the hydraulic cylinder (30) away from the piston rod (26) is fixedly connected to the end positioning support (17).

6. The underwater hydraulic cylinder experimental system simulating different depths according to claim 1 is characterized by: The structure of the pressure oil pipe (24) is as follows: a plurality of support rings (243) arranged along the axial direction are provided in the oil pipe layer (241), gaps are provided between the support rings (243), guide circles are provided at both ends of the support rings (243), and a connection layer (242) is provided between the support rings (243) and the oil pipe layer (241).

7. The underwater hydraulic cylinder experimental system simulating different depths according to claim 1 is characterized by: The structure of the sealing port (21) is as follows: a portion of the outer sealing cover (212) penetrates into the end cover and is connected to the end cover via a plurality of outer sealing bolts (213); the outer wall of the outer sealing cover (212) is sealed with the end cover via a first sealing ring (214); The inner sealing cover (211) is connected to the outer sealing cover (212) via a plurality of inner sealing screws (218); A spherical sleeve (217) is provided between the inner sealing cover (211) and the outer sealing cover (212), and the outer wall of the spherical sleeve (217) is sealed with the outer sealing cover (212) via a second sealing ring (215); A through hole is provided at the center of the spherical sleeve (217), a self-tightening sealing ring (216) is provided in the through hole, and the self-tightening sealing ring (216) is movably and sealingly connected to the piston rod or an extension rod of the piston rod; The self-tightening sealing ring (216) is provided with a V-shaped opening, and the V-shaped opening faces the inner side of the end cover.

Images