Underwater hydraulic uncovering mechanism

Abstract

The underwater hydraulic uncovering mechanism comprises a hydraulic cylinder body, a push rod, a limiting ring, a piston I, a sealing ring, a dustproof ring, hydraulic oil, a piston II, an air inlet device and an end cover. A guide groove is formed in one end of the hydraulic cylinder body, and the push rod slides along the guide groove; the outer end face of the push rod is fixed to a to-be-opened end cover. One end of the piston I abuts against the inner side end face of the push rod, and the other end of the piston I is limited by an annular boss arranged on the inner wall of the cylinder body. The piston I is limited by a limiting ring arranged on the inner wall of the cylinder body after moving in place; hydraulic oil is filled between the small end of the piston II and the other end of the piston I; a sealing ring is arranged between the large end of the piston II and the inner wall of the cylinder body; after the piston II moves in place, the large end of the piston II is limited by the annular boss; the other end of the cylinder body is sealed by an end cover which is provided with an air inlet device. The thrust is large, and different thrusts and strokes can be designed according to the relation between the strokes and the thrusts.

Description

Technical Field

[0001] The invention relates to the technical field of underwater unmanned equipment, and in particular to an underwater hydraulic cover opening mechanism. Background Art

[0002] At present, there are many cover opening mechanisms used underwater, and the cover opening mechanism used on the bottom of the water is relatively rare. The underwater cover opening mechanisms used include explosive bolts, thrusters, gas generators and the like.

[0003] Conventional opening mechanism such as Figure 1 As shown, it is mainly composed of an airbag, a shell, an end cover and a seal. The shell, the end cover and the seal completely seal the airbag in the internal cavity. When in use, the end cover is required to be opened and the airbag is completely released from the shell. When in use, the air source will inflate the airbag. In order to prevent the airbag from being over-inflated and ruptured, a pressure-limiting valve is installed on the surface of the airbag. When the pressure difference between the inside and outside of the airbag reaches a certain value, the pressure-limiting valve will open to exhaust, so that the pressure difference between the inside and outside of the airbag is always kept within a certain range. During the inflation process of the airbag, the expansion of the airbag pushes the end cover open, and the airbag is further inflated and squeezed out of the cavity to complete the entire action process, such as Figure 2 shown.

[0004] The cavity where the airbag is installed is a closed cavity. When used underwater, the pressure exerted by the external water pressure on the end cover is very huge. Assuming that the cross-sectional area of ​​the end cover is S1 and the cross-sectional area of ​​the piston is S2, and the cross-sectional area of ​​the piston is relatively small compared with the cross-sectional area of ​​the end cover, it can be concluded from the relationship between pressure and pressure that the air source pressure to push the piston needs to be 1 / 2 of the external water pressure. If there is mud or other obstacles on the outside of the end cover, it will be even more difficult to open the cover. Summary of the invention

[0005] In view of this, the present invention provides an underwater hydraulic cover opening mechanism with large thrust, and different thrusts and strokes can be designed according to the relationship between the stroke and the thrust.

[0006] The technical solution adopted by the present invention is as follows:

[0007] An underwater hydraulic cover opening mechanism comprises a hydraulic cylinder body, a push rod, a limit ring, a piston I, a sealing ring, a dust ring, hydraulic oil, a piston II, an air intake device and a hydraulic cylinder end cover;

[0008] The hydraulic cylinder body is open, and a guide groove is provided inside one end, and the push rod slides along the guide groove; the outer end face of the push rod is used to be fixed to the end cover to be opened; one end of the piston I abuts against the inner end face of the push rod, and the other end of the piston I is limited by an annular boss provided on the inner wall of the hydraulic cylinder body; a sealing ring and a dust ring are provided between the piston I and the inner wall of the hydraulic cylinder body, and the dust ring is closer to the push rod than the sealing ring; after the piston I moves into place, it is limited by a limiting ring provided on the inner wall of the hydraulic cylinder body; the cross-sectional areas at both ends of the piston II are different, and hydraulic oil is filled between the small end of the piston II and the other end of the piston I; the large end of the piston II faces outward, and a sealing ring is provided between it and the inner wall of the hydraulic cylinder body; after the piston II moves into place, its large end is limited by the annular boss provided on the inner wall of the hydraulic cylinder body; the other end of the hydraulic cylinder body is closed by the hydraulic cylinder end cover, and the hydraulic cylinder end cover is provided with an air intake device for providing power to drive the piston II to move.

[0009] Furthermore, an oil filling hole is provided in the middle of the piston I, and hydraulic oil is injected and sealed through an oil seal screw.

[0010] Furthermore, the inner diameter of the guide groove is larger than the diameter of the large end of the piston II.

[0011] Furthermore, the limiting ring is threadedly connected to the inner wall of the hydraulic cylinder.

[0012] Furthermore, a protrusion is provided on the end surface where the push rod and piston I are connected; the piston I is a stepped shaft, the large diameter section cooperates with the inner wall of the pneumatic cylinder body, the small diameter section is hollow inside, and the hollow part is clamped on the outer periphery of the protrusion.

[0013] Furthermore, the push rod is a three-claw push rod.

[0014] Furthermore, the push rod is a cylinder with one end open, and the open end faces outwards.

[0015] Furthermore, the hydraulic cover opening mechanism also includes a shell, an airbag, and a seal; one end of the shell is open and is used to be sealed and connected to the end cover to be opened through a seal, and a through hole is provided in the middle of the other end of the shell for installing the pneumatic cylinder end cover; the pneumatic cylinder body is located in the middle of the shell and forms an integrated structure with the shell, and the airbag is arranged in the shell for inflating and releasing after the end cover to be opened is fully opened, thereby driving the mechanism to float.

[0016] Furthermore, there are two airbags, which are symmetrically arranged in the shell.

[0017] Beneficial effects:

[0018] 1. The present invention adopts hydraulic oil to convert force, so as to achieve the purpose of amplifying the force and shortening the piston movement stroke. It can provide greater thrust in the limited space of the hydraulic cylinder body, cope with the blocking problems such as large underwater back pressure and silt on the outside of the end cover, and ensure that the cover can be opened smoothly; secondly, the present invention avoids the use of pyrotechnics and improves safety.

[0019] 2. The inner diameter of the guide groove of the present invention is larger than the diameter of the large end of the piston II, so that the end cover to be opened is subjected to more uniform force and the cover is opened more smoothly.

[0020] 3. The end surface where the push rod and the piston I are connected is provided with a protrusion, and the piston I is engaged with the outer periphery of the protrusion, so that the connection between the two is more reliable.

[0021] 4. The present invention also includes an air bag, which is inflated and released after the end cover is fully opened, driving the mechanism to float upward to assist recovery or serve as a beacon.

[0022] 5. The present invention can design different thrusts and strokes according to the relationship between the stroke and the thrust, and the purpose of adjusting the thrust and the stroke can be achieved by designing different force-bearing cross-sectional areas of piston I and small end cross-sectional areas of piston II. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a conventional air bag opening mechanism.

[0024] Figure 2 Schematic diagram of the conventional airbag opening process.

[0025] Figure 3 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 4 It is a schematic structural diagram of another embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of opening the cover of another embodiment of the present invention.

[0028] Figure 6 It is a schematic diagram of the cross-sectional area of ​​each structure of the present invention.

[0029] Figure 7 This is a schematic diagram of the structure of piston II of the present invention.

[0030] Figure 8 This is a schematic diagram of the structure of piston I of the present invention.

[0031] Fig. 9 It is a schematic diagram of the push rod structure of the present invention.

[0032] Among them, 1-hydraulic cylinder body, 2-push rod, 3-limiting ring, 4-piston I, 5-oil seal screw, 6-dust ring, 7-sealing ring, 8-hydraulic oil, 9-piston II, 10-intake device, 11-hydraulic cylinder end cover. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0034] The present invention provides an underwater hydraulic cover opening mechanism, comprising a hydraulic cylinder body 1, a push rod 2, a limit ring 3, a piston I 4, a sealing ring, a dust ring 6, hydraulic oil 8, a piston II 9, an air intake device 10 and a hydraulic cylinder end cover 11.

[0035] like Figure 3 As shown, the hydraulic cylinder body 1 is open, and a guide groove is provided inside one end, and the push rod 2 slides along the guide groove, and the push rod 2 is installed in the guide groove of the hydraulic cylinder body 1 from the left; the outer end face of the push rod 2 is used to fix with the end cover to be opened; one end of the piston Ⅰ4 abuts against the inner end face of the push rod 2, and the other end of the piston Ⅰ4 is limited by the annular boss provided on the inner wall of the hydraulic cylinder body 1, and a sealing ring 7 and a dust ring 6 are provided between the piston Ⅰ4 and the inner wall of the hydraulic cylinder body 1. Compared with the sealing ring 7, the dust ring 6 is closer to the push rod 2, and the dust ring 6 mainly prevents the seabed mud and sand from entering the position of the sealing ring 7 and affecting the sealing; after the piston Ⅰ4 moves into position, it is limited by the limiting ring 3 provided on the inner wall of the hydraulic cylinder body 1, and the limiting ring 3 is threadedly connected with the inner wall of the hydraulic cylinder body 1; as shown Figure 7 As shown, the cross-sectional areas of the two ends of piston II 9 are different, and they are divided into a large end and a small end. Hydraulic oil 8 is filled between the small end of piston II 9 and the other end of piston I 4; specifically, an oil filling hole is provided in the middle of piston I 4, and hydraulic oil 8 is injected through the oil filling hole after piston I 4 and piston II 9 are installed in place, and then the oil filling hole is sealed by an oil seal screw 5. The large end of piston II 9 faces outward, and a sealing ring is provided between it and the inner wall of the hydraulic cylinder body 1; after piston II 9 moves into place, its large end is limited by an annular boss provided on the inner wall of the hydraulic cylinder body 1; the width of the end faces on both sides of the annular boss is different, and accordingly, the inner diameter of the hydraulic cylinder body 1 on both sides of the annular boss is different, specifically, the cylinder body on the left side of the annular boss cooperates with the other end of piston I 4, and the cylinder body on the right side of the annular boss cooperates with the large end of piston II 9, wherein the inner diameter of the cylinder body that cooperates with the other end of piston I 4 is larger than the inner diameter of the cylinder body that cooperates with the large end of piston II 9. That is to say, in this embodiment, the diameter of the other end of piston I 4 (the end receiving the hydraulic pressure) is larger than the diameter of the large end of piston II 9. The inner diameter of the guide groove is larger than the diameter of the large end of the piston II 9 and also larger than the diameter of the end of the piston I 4 receiving the liquid pressure.

[0036] The other end of the hydraulic cylinder body 1 is closed by a hydraulic cylinder end cover 11, and an air intake device 10 is provided on the hydraulic cylinder end cover 11 for connecting to an external air source to provide power for driving the piston II 9 to move.

[0037] This device has a large thrust, and different thrusts and strokes can be designed according to the relationship between stroke and thrust. Figure 6As shown, the pressure of the gas source is set to P1, the cross-sectional area of ​​the large end of piston II 9 is S1, the cross-sectional area of ​​the small end is S2, the cross-sectional area of ​​the end receiving the liquid pressure of piston I 4 is S3, and the thrust of the push rod 2 on the end cover to be opened is F, then Therefore, the thrust and stroke can be adjusted by designing different cross-sectional areas S3 and S2.

[0038] Preferably, the end surface where the push rod 2 and the piston Ⅰ4 meet is provided with a protrusion; Figure 8 As shown, piston Ⅰ4 is a stepped shaft, the large diameter section cooperates with the inner wall of the cylinder body of the pneumatic cylinder, the small diameter section is hollow inside, and the hollow part is engaged with the outer periphery of the protrusion.

[0039] like Fig. 9 As shown, the push rod 2 can be a three-claw push rod, including a docking cone and three rods, one end of the docking cone is used to dock with the piston, and three rods are evenly arranged on the circumference of the other end; the push rod 2 can also be a cylinder, one end of the cylinder is open, and the open end faces outward; the push rod 2 can also be a cylindrical rod.

[0040] In another embodiment, in order to save space, the underwater hydraulic cover opening mechanism of the present invention can be integrated into the air bag cover opening mechanism. Figure 4 As shown, the hydraulic cover opening mechanism also includes a shell, an airbag, and a seal; one end of the shell is open, which is used to be sealed and connected with the end cover to be opened through a seal, and a through hole is provided in the middle of the other end of the shell for installing the pneumatic cylinder end cover; the pneumatic cylinder body is located in the middle of the shell and forms an integrated structure with the shell, and the airbag is arranged in the shell, which is used to inflate and release after the end cover to be opened is fully opened, thereby driving the mechanism to float.

[0041] Preferably, there are two airbags, which are symmetrically arranged in the housing to prevent one of the airbags from being damaged, in which case the other airbag can be used normally.

[0042] The working process is as follows: the air source inflates the hydraulic cylinder through the air inlet device 10, pushing the piston II 9 to move to the left until it is limited, the hydraulic oil 8 pushes the piston I 4 to move to the left, and the push rod 2 is pushed by the piston I 4 and pushed open together with the end cover to be opened. After the end cover is completely pushed open, the airbag is inflated, and the airbag can be smoothly released from the cavity. Figure 5 shown.

[0043] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of 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. An underwater hydraulic cover opening mechanism, characterized in that: It includes a hydraulic cylinder body, a push rod, a limit ring, a piston I, a sealing ring, a dust ring, hydraulic oil, a piston II, an air intake device and a hydraulic cylinder end cover; The hydraulic cylinder body is open, and a guide groove is provided inside one end, and the push rod slides along the guide groove; the outer end face of the push rod is used to be fixed to the end cover to be opened; one end of the piston I abuts against the inner end face of the push rod, and the other end of the piston I is limited by an annular boss provided on the inner wall of the hydraulic cylinder body; a sealing ring and a dust ring are provided between the piston I and the inner wall of the hydraulic cylinder body, and the dust ring is closer to the push rod than the sealing ring; after the piston I moves into place, it is limited by a limiting ring provided on the inner wall of the hydraulic cylinder body; the cross-sectional areas at both ends of the piston II are different, and hydraulic oil is filled between the small end of the piston II and the other end of the piston I; the large end of the piston II faces outward, and a sealing ring is provided between it and the inner wall of the hydraulic cylinder body; after the piston II moves into place, its large end is limited by the annular boss provided on the inner wall of the hydraulic cylinder body; the other end of the hydraulic cylinder body is closed by the hydraulic cylinder end cover, and the hydraulic cylinder end cover is provided with an air intake device for providing power to drive the piston II to move.

2. The underwater hydraulic cover opening mechanism according to claim 1, characterized in that: An oil filling hole is arranged in the middle of the piston I, and hydraulic oil is injected and sealed through an oil seal screw.

3. The underwater hydraulic cover opening mechanism according to claim 1, characterized in that: The inner diameter of the guide groove is larger than the diameter of the large end of the piston II.

4. The underwater hydraulic cover opening mechanism according to claim 1, characterized in that: The limiting ring is threadedly connected to the inner wall of the hydraulic cylinder.

5. The underwater hydraulic cover opening mechanism according to claim 1, characterized in that: The end face where the push rod and piston I are connected is provided with a protrusion; the piston I is a stepped shaft, the large diameter section cooperates with the inner wall of the cylinder body of the pneumatic cylinder, the small diameter section is hollow inside, and the hollow part is clamped on the outer periphery of the protrusion.

6. The underwater hydraulic cover opening mechanism according to claim 5, characterized in that: The push rod is a three-claw push rod.

7. The underwater hydraulic cover opening mechanism according to claim 5, characterized in that: The push rod is a cylinder with one end open, and the open end faces outwards.

8. The underwater hydraulic cover opening mechanism according to any one of claims 1 to 7, characterized in that: The hydraulic cover opening mechanism also includes a shell, an airbag, and a seal; one end of the shell is open and is used to be sealed and connected with the end cover to be opened through a seal, and a through hole is provided in the middle of the other end of the shell for installing the pneumatic cylinder end cover; the pneumatic cylinder body is located in the middle of the shell and forms an integrated structure with the shell, and the airbag is arranged in the shell and is used to inflate and release after the end cover to be opened is fully opened, thereby driving the mechanism to float.

9. The underwater hydraulic cover opening mechanism according to claim 8, characterized in that: There are two air bags, which are symmetrically arranged in the shell.

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