Deep-sea pressure-resistant EHA integrated hydraulic cylinder driving system

Abstract

The utility model discloses a deep-sea pressure-resistant EHA integrated hydraulic cylinder driving system, relates to the technical field of hydraulic cylinders, and solves the problem that in the prior art, a hydraulic oil cylinder is lack of oil in a deep-sea high-pressure environment, seawater enters the hydraulic oil cylinder, and pollution is caused. The device comprises a hydraulic cylinder, the hydraulic cylinder is connected with an input oil pipe and is connected with a telescopic oil storage device through the input oil pipe, and the telescopic oil storage device is connected with a compensation driving assembly. The compensation driving assembly can control the telescopic oil reservoir to increase pressure into the hydraulic cylinder through the oil input pipe, so that the internal oil pressure is larger than the external seawater pressure when the hydraulic cylinder is used in the deep sea, slight oil drainage is actively generated to bear the high pressure of the deep sea, and meanwhile hydraulic oil can be continuously input into the hydraulic cylinder; the micro oil drainage amount of the hydraulic cylinder is counteracted, and seawater infiltration is prevented. The driving system has high pressure resistance and can meet the requirement of deep sea operation.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system. Background Art

[0002] The deep-sea working environment is characterized by low temperature, high pressure, easy corrosion, and rich in microorganisms. The deep-sea environment has high requirements for the sealing and pressure bearing capacity of hydraulic cylinders. When hydraulic cylinders work in the deep-sea environment, two problems are prone to occur: First, due to the high environmental pressure in the deep sea, it is easy to cause the piston rod seal to fail, seawater and microorganisms to enter the hydraulic system, pollute the hydraulic oil, and cause serious consequences. At present, the measures taken to address this problem are to set a pressure compensator to make the internal pressure of the hydraulic system equal to or slightly higher than the deep-sea environmental pressure to ensure that seawater does not enter the hydraulic system. However, in most cases, the internal pressure of the hydraulic system can only be controlled to be slightly higher than the deep-sea environmental pressure, and it is difficult to accurately control it to be equal to the environmental pressure. Therefore, when the internal pressure is high, it is inevitable that oil leakage will occur. Second, because the piston rod has to extend out of the hydraulic cylinder when working, the outer surface is exposed to seawater and is easily corroded. At the same time, the outer surface will inevitably be contaminated with oil and released into the seawater. Therefore, after long-term use, it is inevitable that the oil in the cylinder will be slightly missing, resulting in the problem of seawater entering and causing pollution.

[0003] At present, there are studies on deep-sea integrated hydraulic cylinder drive systems, such as the Chinese invention patent with publication number CN116753209A, which is a buffered multi-stage servo hydraulic cylinder. This invention uses a combination of multiple pressure chambers and a servo motor to achieve high-precision position control and speed regulation. The Chinese invention patent with publication number CN116677670A discloses a digital hydraulic cylinder, which uses a motor-controlled valve to achieve the movement of the hydraulic cylinder at different speeds under digital pulses. The Chinese utility model patent with publication number CN116044854A discloses a digital hydraulic cylinder, which also uses a motor to control a three-position two-way reversing valve to control the hydraulic cylinder to achieve reciprocating motion. None of the above technologies mention how to compensate for or solve the oil loss phenomenon, which can easily lead to seawater entering the interior under high-pressure conditions and causing pollution.

[0004] The Chinese utility model patent with announcement number CN208185123U discloses a hydraulic oil cylinder suitable for deep-sea working environment, in which the end cover of the hydraulic cylinder is connected to a pressure compensation bladder through a pipe joint, and the pressure compensation bladder is connected to the isolation bladder through the internal oil hole on the end cover of the oil cylinder and is filled with hydraulic working medium. In this utility model, although the oil is replenished and recovered through the pressure compensation bladder, it only occurs inside the external isolation bladder, and it does not actually replenish the oil that plays a driving role inside the hydraulic cylinder, which is also easy to cause seawater to enter and cause pollution in the deep-sea environment. Utility Model Content

[0005] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system, which solves the problem in the prior art that the hydraulic cylinder suffers from oil loss in the high-pressure environment of the deep sea, resulting in seawater intrusion and pollution.

[0006] The technical solution of the utility model is implemented as follows: a deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system includes a hydraulic cylinder, which is connected to an input oil pipe and connected to a telescopic oil reservoir through the input oil pipe, and the telescopic oil reservoir is connected to a compensation drive component.

[0007] Preferably, the telescopic oil reservoir comprises a box body, in which a flexible bladder is arranged, and two ends of the flexible bladder pass through the box body and are respectively connected with an input oil pipe and a compensation drive assembly.

[0008] Preferably, the oil input pipe comprises an oil delivery pipeline connected to both ends of the hydraulic cylinder respectively, and the oil delivery pipeline is connected to the flexible bladder through an adapter. Further, the flexible bladder is a fluororubber bladder.

[0009] Preferably, the compensating drive assembly includes a push rod outer tube, a flexible leather bag is connected to the interface, and the interface is connected to the push rod outer tube; a push rod is slidably provided inside the push rod outer tube, the push rod is connected to the screw transmission mechanism, the push rod outer tube is fixedly connected to the motor, and the output end of the motor can drive the push rod to slide through the screw transmission mechanism.

[0010] Preferably, the screw transmission mechanism includes a screw transmission connected to the output end of the motor, a screw nut is threadedly connected to the screw, and the screw nut cooperates with the push rod.

[0011] Preferably, the output end of the motor is connected to the input end of the reducer, and the output end of the reducer is connected to the lead screw and can drive the lead screw to rotate.

[0012] Preferably, the hydraulic cylinder includes a cylinder barrel, one end of which is fixedly provided with a cylinder bottom, and the other end is provided with a guide sleeve, the guide sleeve is slidably connected to a piston rod, the piston rod is provided with a piston, and the piston is slidably matched with the cylinder barrel; the two ends of the cylinder barrel are respectively connected to oil pipes, and the oil pipes are both connected to a hydraulic oil pump.

[0013] Preferably, a displacement sensor is provided between the piston rod and the cylinder bottom; and a buffer oil storage port for cooperating with the piston rod is provided on the cylinder bottom.

[0014] Preferably, dust rings, sealing rings and wear-resistant rings for sealing are provided between the guide sleeve and the piston rod, between the guide sleeve and the cylinder barrel, and between the piston and the cylinder barrel.

[0015] The beneficial effects of the utility model are as follows: the compensating drive component can control the telescopic oil reservoir to increase the pressure in the hydraulic cylinder through the input oil pipe, so that the internal oil pressure of the hydraulic cylinder is greater than the external seawater pressure when used in the deep sea, and a slight oil leakage is actively generated to withstand the higher pressure of the deep sea. At the same time, hydraulic oil can be continuously input into the hydraulic cylinder to offset the slight oil leakage of the hydraulic cylinder and prevent seawater from infiltrating. The drive system has high pressure resistance and can meet the requirements of deep sea operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the external structure of the utility model;

[0018] Figure 2 This is a side view of the structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the utility model;

[0020] Figure 4 This is an enlarged structural diagram of the utility model;

[0021] In the figure: 1: hydraulic cylinder, 2: input oil pipe, 3: telescopic oil reservoir, 4: compensation drive assembly, 5: box, 6: flexible leather bag, 7: oil pipeline, 8: adapter, 9: push rod outer tube, 10: interface, 11: push rod, 12: motor, 13: screw, 14: screw nut, 15: reducer, 16: cylinder, 17: cylinder bottom, 18: guide sleeve, 19: piston rod, 20: piston, 21: oil pipe, 22: hydraulic oil pump, 23: piston nut, 24: buffer oil storage port, 29: connecting ring, 30: key, 31: stopper sleeve, 32: axial stopper ring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1 , 2As shown in Figure 3, embodiment 1 is a deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system, including a hydraulic cylinder 1, which is connected to an input oil pipe 2 and connected to a telescopic oil reservoir 3 through the input oil pipe 2. The telescopic oil reservoir 3 is used to store oil for compensation, and the telescopic oil reservoir 3 is connected to a compensation drive assembly 4. When this embodiment is in use, the compensation drive assembly can provide thrust, and the oil in the telescopic oil reservoir is input into the hydraulic cylinder through the input oil pipe, which increases the pressure in the hydraulic cylinder, so that the internal oil pressure of the hydraulic cylinder is greater than the external seawater pressure when the hydraulic cylinder is used in the deep sea, and a slight oil leakage is actively generated to withstand the higher pressure of the deep sea. At the same time, a small amount of hydraulic oil is continuously input into the hydraulic cylinder to offset the slight oil leakage of the hydraulic cylinder and prevent seawater from infiltrating. This makes the drive system have a high pressure resistance and can meet the requirements of deep-sea operations.

[0024] Specifically, in this embodiment, the telescopic oil storage device 3 includes a box body 5, in which a flexible bladder 6 is arranged, and both ends of the flexible bladder 6 pass through the box body 5 and are respectively connected to the input oil pipe 2 and the compensation drive assembly 4. The box body can isolate the direct contact between the flexible bladder and the seawater to enhance the service life of the flexible bladder in the deep sea environment. In this embodiment, the flexible bladder 6 is a fluororubber bladder, which is a high-performance synthetic polymer elastomer with excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance, and can better meet the use environment requirements of this embodiment.

[0025] Embodiment 2, on the basis of embodiment 1, as Figure 3 , 4 As shown, the compensation drive assembly 4 includes a push rod outer tube 9, a flexible bladder 6 connected to an interface 10, and the interface 10 is connected to the push rod outer tube 9. A push rod 11 is slidably arranged inside the push rod outer tube 9, and the push rod 11 is connected to a screw transmission mechanism. The push rod outer tube 9 is fixedly connected to a motor 12, and the output end of the motor 12 can drive the push rod 11 to slide through the screw transmission mechanism, so that the medium located in the push rod outer tube is pushed into the flexible bladder through the interface. In this embodiment, the interface 10 is set in a cone shape, which is conducive to guiding the flow of the medium when the push rod is pushed to move, and the medium in the push rod outer tube can be selected as an air medium.

[0026] The lead screw transmission mechanism includes a lead screw 13 connected to the output end of the motor 12, a lead screw nut 14 is threadedly connected to the lead screw 13, and the lead screw nut 14 is fixedly connected to the push rod 11, and the lead screw nut and the push rod outer tube are slidably matched through a keyway and a guide. The motor drives the lead screw to rotate, and under the transmission of the lead screw and the lead screw nut, the lead screw nut is driven to move vertically, and then the push rod is synchronously driven to move relative to the push rod outer tube.

[0027] As a further embodiment, an end plug is fixedly provided on the push rod, and the end plug can be selected as a conventional seal to play a sealing role. When the screw transmission mechanism pushes the push rod to move to provide power for the oil in the flexible bladder and prompts the oil in the flexible bladder to be injected into the hydraulic cylinder, it also prevents the liquid from flowing back into the screw transmission mechanism.

[0028] As a further optional embodiment, the output end of the motor 12 is connected to the input end of the reducer 15, and the output end of the reducer 15 is connected to the lead screw 13 and can drive the lead screw 13 to rotate. Specifically, the motor and the push rod outer tube are fixedly connected to the outer shell of the reducer 15, and a gear pair is provided in the reducer. The output end of the motor passes through the input end of the reduction box and is driven by the gear pair to drive the lead screw connected to the output end of the reducer to rotate.

[0029] Embodiment 3, on the basis of embodiment 2, the hydraulic cylinder 1 comprises a cylinder barrel 16, one end of the cylinder barrel 16 is welded and fixed with a cylinder bottom 17, and the other end is provided with a guide sleeve 18, the guide sleeve 18 is slidably connected with a piston rod 19, the piston rod 19 is provided with a piston 20, and the piston 20 is slidably matched with the cylinder barrel 16. In this embodiment, the piston rod is an integrated design, one end of the piston rod and the cylinder bottom 17 are provided with a connecting ring 29 for connection, the other end of the piston rod is sleeved with a piston, and the piston 20 is locked by a piston nut 23. A clamping key 30 for limiting the positions of the two is provided between the guide sleeve 18 and the cylinder barrel 16, the inner side of the clamping key 30 is simultaneously in contact with the guide sleeve 18 and the cylinder barrel 16, and a retaining sleeve 31 is provided on the outer side, and an axial retaining ring 32 is provided on the outer side of the retaining sleeve 31, and the axial retaining ring 32 is clamped and fixed with the guide sleeve 18.

[0030] In addition, the input oil pipe 2 includes an oil delivery pipeline 7 connected to both ends of the hydraulic cylinder 1. In this embodiment, the oil delivery pipeline 7 is connected to the openings at both ends of the side wall of the cylinder barrel 16, and the openings at both ends of the side wall of the cylinder barrel 16 are respectively located on both sides of the piston 20. The oil delivery pipeline 7 is connected to the flexible bladder 6 through the adapter 8. When the motor 12 drives the push rod 11 to move and push the medium in the outer tube of the push rod into the flexible bladder, the oil in the flexible bladder 6 is pushed into the cylinder barrel 16 through the adapter and the oil delivery pipeline to compensate for the missing oil on both sides of the piston 20.

[0031] As a further specific implementation, oil pipes 21 are respectively connected to both ends of the cylinder 16, and both ends of the oil pipe 21 are respectively connected to the oil inlet and outlet of the hydraulic oil pump 22, so that the hydraulic oil pump 22 can pump oil into one end of the piston in the cylinder 16 through the oil pipe 21, and return oil to the hydraulic oil pump from the oil pipe 21 connected to the other end of the piston, thereby realizing the control of the extension and retraction of the hydraulic cylinder.

[0032] As a further implementation, a displacement sensor is provided between the piston rod 19 and the cylinder bottom 17. In this embodiment, the displacement sensor may be an LVDT displacement sensor, which is fixed in the inner hole of the piston rod 19 and is used to monitor the position of the piston or piston rod relative to the cylinder bottom. A buffer oil storage port 24 is provided on the end surface of the cylinder bottom 17 for cooperating with the end surface of the piston rod. The buffer oil storage port can reduce the mechanical impact between the piston rod 19 and the cylinder bottom 17 when the piston rod 19 is retracted to be close to the cylinder bottom 17, thereby protecting the parts and reducing damage.

[0033] As a further optional implementation, in this embodiment, dust rings, sealing rings and wear-resistant rings for sealing are provided between the guide sleeve 18 and the piston rod 19, between the guide sleeve 18 and the cylinder barrel 16, and between the piston 20 and the cylinder barrel 16, so as to achieve a sealing effect between the connecting components.

[0034] 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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system, comprising a hydraulic cylinder (1), characterized in that: The hydraulic cylinder (1) is connected to an input oil pipe (2) and is connected to a telescopic oil reservoir (3) via the input oil pipe (2); the telescopic oil reservoir (3) is connected to a compensation drive assembly (4).

2. The deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system according to claim 1 is characterized in that: The telescopic oil storage device (3) comprises a box body (5), a flexible bladder (6) is arranged inside the box body (5), and two ends of the flexible bladder (6) pass through the box body (5) and are respectively connected to the input oil pipe (2) and the compensation drive component (4).

3. The deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system according to claim 2 is characterized in that: The input oil pipe (2) comprises an oil delivery pipeline (7) respectively connected to two ends of the hydraulic cylinder (1), and the oil delivery pipeline (7) is connected to the flexible bladder (6) via an adapter (8).

4. The deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system according to claim 3 is characterized in that: The flexible bladder (6) is a fluororubber bladder.

5. The deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system according to any one of claims 2 to 4, characterized in that: The compensating drive assembly (4) comprises a push rod outer cylinder (9), a flexible bladder (6) connected to an interface (10), and the interface (10) connected to the push rod outer cylinder (9); A push rod (11) is slidably disposed inside the push rod outer tube (9), the push rod (11) is connected to a screw transmission mechanism, the push rod outer tube (9) is fixedly connected to a motor (12), and the output end of the motor (12) can drive the push rod (11) to slide through the screw transmission mechanism.

6. The deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system according to claim 5 is characterized in that: The screw transmission mechanism comprises a screw (13) drivingly connected to the output end of the motor (12), a screw nut (14) being threadedly connected to the screw (13), and the screw nut (14) is matched with the push rod (11).

7. The deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system according to claim 6 is characterized in that: The output end of the motor (12) is connected to the input end of the reducer (15), and the output end of the reducer (15) is connected to the lead screw (13) and can drive the lead screw (13) to rotate.

8. The deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system according to claim 1 or 7, characterized in that: The hydraulic cylinder (1) comprises a cylinder barrel (16), one end of the cylinder barrel (16) is fixedly provided with a cylinder bottom (17), the other end is provided with a guide sleeve (18), the guide sleeve (18) is slidably connected to a piston rod (19), the piston rod (19) is provided with a piston (20), and the piston (20) is slidably matched with the cylinder barrel (16); the two ends of the cylinder barrel (16) are respectively connected to oil pipes (21), and the oil pipes (21) are both connected to a hydraulic oil pump (22).

9. The deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system according to claim 8, characterized in that: A displacement sensor (23) is provided between the piston rod (19) and the cylinder bottom (17); and a buffer oil storage port (24) for cooperating with the piston rod (19) is provided on the cylinder bottom (17).

10. The deep-sea pressure-resistant EHA integrated hydraulic cylinder drive system according to claim 9, characterized in that: A dust ring, a sealing ring and a wear-resistant ring for sealing are provided between the guide sleeve (18) and the piston rod (19), between the guide sleeve (18) and the cylinder barrel (16), and between the piston (20) and the cylinder barrel (16).

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