Hydraulic actuator suitable for deep sea environment

Abstract

The hydraulic actuator suitable for the deep sea environment comprises a box body, a piston rod hole is formed in the box body, a piston rod is arranged in the piston rod hole, a rack is arranged in the middle of the piston rod, a gear meshed with the rack is arranged in the box body, hydraulic cylinder bodies are arranged at the two ends of the piston rod in a sleeved mode respectively, and the hydraulic cylinder bodies are connected with the rack in a sleeved mode. Pistons are fixedly arranged at the two ends of the piston rod in a sleeved mode, one end of the hydraulic cylinder body is connected with a cylinder body guide hole in a sealed mode, a stroke adjusting structure is arranged at the other end of the hydraulic cylinder body, one end of the stroke adjusting structure makes contact with the end face of the piston rod, and a first branch and a second branch which extend to the surface of the box body are arranged on an oil way in the box body. The first branch is provided with a needle valve, and the second branch is provided with a pressure measuring connector. On the premise that the hydraulic actuator is compact in structure, small in size and light in weight, the structural length of the actuator is shortened as much as possible, the seawater corrosion resistance safety coefficient is improved, and the action time of a switch is controlled within 0.3 second.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid automation control technical field, concretely relates to a hydraulic actuator suitable for deep sea environment. BACKGROUND

[0002] At present, the hydraulic actuator on the market, the protection level is mostly IP65, switch action time is mostly 2 seconds or more, and there is big, heavy condition, difficult to meet offshore platform, ship bilge water system, ship ballast tank etc. The narrow installation space, and the switch speed of actuator, hydraulic cylinder leakage level, seawater corrosion resistance ability has very high requirement of harsh working condition, a small part of protection level although can reach IP68, but also only applicable to the working condition of extreme depth 20 meters within.

[0003] As the terminal device of remote control system, with the gradual deepening of marine development work, the deep water pressure resistance of actuator, diving time, seawater corrosion resistance, anti-interference, high reliability have further requirements. SUMMARY

[0004] In order to solve the above technical problems, the utility model provides a hydraulic actuator suitable for deep sea environment.

[0005] The utility model discloses a hydraulic actuator suitable for deep sea environment, including the box, be equipped with the piston rod hole that penetrates left and right end face and set up relative to two end surface axis direction on the box, the piston rod hole is equipped with the piston rod that can move along the direction of penetration, the middle of piston rod is equipped with the rack, the box is equipped with the gear that can rotate, the rack is connected with the gear meshing, the piston rod hole corresponding box side is provided with cylinder guide hole, the both ends of piston rod are respectively equipped with hydraulic cylinder body, the both ends of piston rod are all equipped with the piston that is relative to the box left and right symmetry and is fixed, the inboard of piston is sealedly connected with piston rod, and the outside of piston is sealedly movably connected with the inner wall of hydraulic cylinder body, one end of hydraulic cylinder body is sealedly connected with cylinder guide hole, and is sealed and is tight through sealing nut three, the other end is provided with stroke adjusting structure, one end of stroke adjusting structure is in contact with the end surface of piston rod, the one side of box and the hydraulic cylinder body on the both sides of piston rod are all equipped with oil port, the oil port on the box is connected with the oil port on the hydraulic cylinder body through the joint and seamless steel pipe, so that the oil circuit of hydraulic cylinder body is communicated with the oil circuit of box, the first branch and the second branch that extend to the surface of box are set up on the oil circuit in the box, the needle valve is equipped on the first branch, the pressure measuring connector is equipped on the second branch.

[0006] Optionally, the needle valve is equipped with sealing nut two that is sealedly connected with the box on one end of the box outside.

[0007] Optionally, the stroke adjusting structure comprises an adjusting screw, the end of the hydraulic cylinder body away from the end face of the box is provided with a threaded hole, the adjusting screw passes through the threaded hole and is opposite to the end of the piston rod in the hydraulic cylinder body, a part of the adjusting screw extends into the inner cavity of the hydraulic cylinder body and the other part is exposed outside the hydraulic cylinder body, the end of the adjusting screw outside the hydraulic cylinder body is sleeved with a cover-shaped sealing nut, and the cover-shaped sealing nut is sealingly connected with the end face of the hydraulic cylinder body.

[0008] Optionally, the sealing nut one is sleeved on a part of the adjusting screw outside the hydraulic cylinder body, and is arranged between the cover-shaped sealing nut and the hydraulic cylinder body and sealingly connected with the cover-shaped sealing nut and the hydraulic cylinder body respectively.

[0009] Optionally, the outer circle of the piston is provided with a support ring and a hydraulic oil seal, and the support ring and the hydraulic oil seal are attached to the inner wall of the hydraulic cylinder body.

[0010] Optionally, both ends of the piston rod are stepped shafts, the stepped shafts are provided with threads, the piston is provided with stepped holes with the same shape as the stepped shafts at both ends of the piston rod, the end face of one side of the stepped hole of the piston abuts against the end face of the stepped shaft of the piston rod and is screwed together with the piston rod, and the other side of the piston is sleeved with a nut one and is fastened to the stepped shaft by the nut one.

[0011] Optionally, the box is provided with a radial stepped hole, the stepped hole comprises a lower shaft hole and an upper shaft hole, the lower shaft hole of the stepped hole is provided with an oil groove, the gear is provided with an upper shaft and a lower shaft at both sides, the lower shaft of the gear extends into and is sealingly and rotatably connected in the lower shaft hole of the box, the end of the lower shaft is provided with a shaft hole for driving the valve rod of the valve, the upper shaft of the gear extends into the upper shaft hole of the box, the upper shaft is sleeved with a gear gland, the inner side of the gear gland is sealingly and rotatably connected with the upper shaft, the outer side of the gear gland is sealingly connected with the inner wall of the box, and the end of the upper shaft is provided with an interface of NAMUR installation standard.

[0012] Optionally, the gear gland is provided with a stepped outer circle, a stepped shaft hole and a flange, one end of the stepped outer circle is connected with one end of the flange, the stepped shaft hole is divided into an inner hole and an outer hole, the inner hole is a hole in the middle of the stepped outer circle, and the outer hole is a hole in the middle of the flange, the inner hole of the stepped shaft hole of the gear gland is sleeved on the upper shaft of the gear, the flange of the gear gland is fixed on the top of the box, the lower end face of the gear abuts against the end face of the lower shaft hole of the box, the lower end face of the gear gland limits the radial movement of the upper end face of the gear, and the outer hole of the stepped shaft hole of the gear gland is sealingly plugged by a sealing cover.

[0013] Optionally, screw holes are arranged around the lower shaft hole of the stepped hole of the box body, screw holes one for installing a gear cover are arranged around the upper shaft hole of the stepped hole of the box body, flat head bolts are fixed in the screw holes one, screw holes two for installing a valve feedback bracket are arranged around the upper shaft hole of the stepped hole of the box body, and sealing bolts are sealed in the screw holes two.

[0014] In summary, the utility model has at least one of the following beneficial effects:

[0015] 1. The utility model discloses a hydraulic actuator, which has the advantages of compact structure, small size, light weight, short structure length, high seawater corrosion resistance, and switch action time controlled within 0.3 seconds.

[0016] 2. The utility model discloses a needle valve for controlling the size of the oil passage, which can adjust the working speed of the hydraulic actuator without adding a throttle valve to the system.

[0017] 3. The utility model discloses a switch action, which is rapid. The front end of the piston is provided with a support ring for facilitating the installation of the piston. The rear end of the piston is provided with two hydraulic oil seals. The hydraulic oil seal is preferably a hydraulic step seal composed of PTFE and an O-shaped ring with a linear speed greater than 5 m / s. The first hydraulic step seal is used to scrape off excess oil film, and the second hydraulic step seal is used to seal and pressurize. The switch action time of the actuator is controlled within 0.3 seconds, and the internal leakage of the piston type single-acting hydraulic cylinder is controlled within 30% of the specified value without improving the manufacturing precision of the parts.

[0018] 4. The utility model discloses a fully sealed structure. O-shaped rings or ED sealing rings are used to seal the parts subjected to internal and external air pressure. The parts that may contact seawater are preferably made of seawater corrosion-resistant materials.

[0019] 5. The utility model discloses a compact structure. The gear and the gear shaft are integrated. The diameter of the gear's pitch circle is minimized to reduce the size of the box body and the linear motion stroke of the piston rod, thereby ensuring that the actuator has the characteristics of compact structure and light weight.

[0020] 6, The stroke accurate limiting of the utility model: the threaded hole of the hydraulic cylinder body is equipped with adjusting screw, the depth of adjusting screw extending into the inner chamber of the hydraulic cylinder body can be controlled through rotating adjusting screw, thereby the axial position of the piston rod is limited, the rotation angle of the gear is controlled through the rack on the piston rod, the stroke accurate limiting of the actuator is realized.

[0021] 7, The emergency manual switch control function of the utility model: in the case of hydraulic source failure, the end face of adjusting screw in the hydraulic cylinder body is pushed to move the piston rod through rotating adjusting screw, the rack on the piston rod controls the rotation angle of the gear through the meshing of the gear, the emergency manual switch control function of the valve is realized.

[0022] 8, The wired line feedback valve position signal of the utility model: the valve return device support mounting hole is arranged on the top of the box body, which can be used for installing the support of valve return device; the upper shaft of the gear is provided with the interface of NAMUR installation standard; the sealing cover on the top of the hydraulic actuator is removed, the rotating shaft of valve return device is inserted into the interface of NAMUR installation standard on the upper shaft of the gear, and is fixed on the support of valve return device, so that the wired line feedback valve position signal can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the appearance drawing of the utility model;

[0024] Figure 2 It is the overhead disconnected cross-sectional structure schematic view of the utility model;

[0025] Figure 3 It is the A-A cross-sectional structure schematic view of Figure 2 ;

[0026] Figure 4 It is the B-B cross-sectional structure schematic view of Figure 2 ;

[0027] Figure 5 It is the C local schematic view of Figure 2 ;

[0028] In the diagram: 1. Housing; 2. Piston rod; 3. Hydraulic cylinder body; 4. Piston; 5. Nut 1; 6. Adjusting screw; 7. Sealing nut 1; 8. Cap-shaped sealing nut; 9. Sealing nut 3; 10. First connector; 11. Seamless steel pipe; 12. Second connector; 13. Gear; 14. Gear gland; 15. Sealing cover; 16. Sealing nut 2; 17. Needle valve; 18. Pressure test connector; 19. Flat bolt; 20. Sealing bolt; 21. O-ring 2; 22. O-ring 3; 23. Hydraulic oil seal 1; 24. O-ring 4; 25. Hydraulic oil seal 2; 26. Support ring; 27. ED sealing ring 1; 28. ED sealing ring 2; 29. ​​O-ring 1; 30. O-ring 5; 31. O-ring 6; 32. ED sealing ring 3; 33. ED sealing ring 4; 34. O-ring 7; 35. O-ring 8. Detailed Implementation

[0029] The following combination Figures 1-5 The present invention will be described in further detail below.

[0030] This utility model discloses a hydraulic actuator suitable for deep-sea environments, referring to... Figure 1 and Figure 2 It includes a housing 1, on which a piston rod hole is provided that penetrates the left and right end faces and is positioned relative to the axial direction of the two end faces. Here, left and right are relative. Figure 2 Regarding the display direction, a piston rod 2 that can move along the projection direction is inserted into the piston rod hole. A rack is provided in the middle of the piston rod 2. A rotatable gear 13 is provided inside the housing 1. The rack and gear 13 are meshed together. A cylinder guide hole is provided on the side of the housing 1 corresponding to the piston rod hole. The cylinder guide hole includes a threaded hole for installing the hydraulic cylinder 3 and a sealing guide hole. Hydraulic cylinders 3 are respectively fitted on both ends of the piston rod 2. Pistons 4 that are symmetrical about the left and right of the housing 1 are fitted and fixed on both ends of the piston rod 2. The inner side of the piston 4 is sealed to the piston rod 2, and the outer side of the piston 4 is sealed to the inner wall of the hydraulic cylinder 3.

[0031] Both ends of the piston rod 2 are stepped shafts with threads. The piston 4 has a stepped hole in the middle with the same shape as the stepped shafts at both ends of the piston rod 2. One end face of the stepped hole of the piston 4 rests on the end face of the stepped shaft of the piston rod 2 and is screwed together with the piston rod 2 by threads. The other side of the piston 4 is fitted with a nut 5, and the piston 4 is tightened on the stepped shaft by the nut 5. An O-ring 24 is provided between the stepped hole of the piston 4 and the stepped shaft of the piston rod 2. The outer circle of the piston 4 is provided with a support ring 26, a hydraulic oil seal 23 and a hydraulic oil seal 25. The support ring 26, the hydraulic oil seal 23 and the hydraulic oil seal 25 are all in contact with the inner wall of the hydraulic cylinder 3.

[0032] Specifically, the stepped shafts at both ends of the piston rod 2 are divided into two parts, one is a small shaft with a small diameter away from the middle, and the other is a large shaft with a large diameter close to the middle. The shape of the inner hole in the middle of the piston 4 is the same as the profile of the stepped shafts at both ends of the piston rod 2, realizing the connection and cooperation of the two. The side of the piston 4 is screwed on the stepped shaft of the piston rod 2, and the nut 5 is arranged on the other side of the piston 4, which is pressed against the stepped shaft through the nut 5.

[0033] Referring to Figure 2 and Figure 5 , one end of the hydraulic cylinder body 3 is screwed and sealed with the cylinder guide hole, and O-ring 21 is arranged at the connection between the hydraulic cylinder body 3 and the tank 1 for sealing. The hydraulic cylinder body 3 is tightened on the side of the tank 1 through the sealing nut 9. The screwing surface of the sealing nut 9 and the hydraulic cylinder body 3 is coated with sealing glue. O-ring 22 is used between the sealing nut 9 and the tank 1 for sealing. The other end is provided with a stroke adjusting structure. One end of the stroke adjusting structure is in contact with the end face of the piston rod 2. The side of the tank 1 and the hydraulic cylinder body 3 on both sides of the piston rod 2 are provided with oil ports. The oil ports on the tank 1 and the oil ports on the hydraulic cylinder body 3 are connected through joints and seamless steel pipes 11, so that the oil circuit of the hydraulic cylinder body 3 is communicated with the oil circuit of the tank 1.

[0034] Specifically, the side of the tank 1 is provided with a first oil port A and a second oil port B. The side walls of the two hydraulic cylinder bodies 3 are respectively provided with a third oil port and a fourth oil port. The third oil port and the fourth oil port are connected with the first oil port A and the second oil port B through the second joint 12, the seamless steel pipe 11 and the first joint 10 respectively. Hydraulic oil flows to the inner cavity of the hydraulic cylinder body 3 through the first oil port A and the second oil port B.

[0035] Referring to Figure 4 , the oil circuit in the tank 1 is provided with a first branch and a second branch extending to the surface of the tank 1. The first branch is provided with a needle valve 17, and the second branch is provided with a pressure measuring joint 18. The end of the needle valve 17 located outside the tank 1 is provided with a sealing nut 16 for sealing connection between the needle valve 17 and the tank 1. The screwing surface of the needle valve 17 and the sealing nut 16 is coated with sealing glue. ED sealing ring 33 is used between the needle valve 17 and the sealing nut 16 for sealing. The part of the needle valve 17 located in the oil circuit inside the tank 1 is sealed by O-ring 34 and O-ring 35.

[0036] In a further embodiment, the stroke adjusting structure comprises an adjusting screw 6, the hydraulic cylinder body 3 is provided with a threaded hole at the end away from the box body 1, the adjusting screw 6 passes through the threaded hole and is opposite to the end of the piston rod 2 in the hydraulic cylinder body 3, a part of the adjusting screw 6 extends into the inner cavity of the hydraulic cylinder body 3 for limiting or adjusting the axial position of the piston rod 2, and the other part is exposed outside the hydraulic cylinder body 3, a cover-shaped sealing nut 8 is sleeved on the end of the adjusting screw 6 outside the hydraulic cylinder body 3, and the cover-shaped sealing nut 8 is sealingly connected with the end face of the hydraulic cylinder body 3; a sealing nut one 7 is sleeved on the part of the adjusting screw 6 outside the hydraulic cylinder body 3, and the sealing nut one 7 is arranged between the cover-shaped sealing nut 8 and the hydraulic cylinder body 3 and sealingly connected with the cover-shaped sealing nut 8 and the hydraulic cylinder body 3 respectively;

[0037] Specifically, the sealing nut one 7 is provided with a threaded hole in the axial direction, the side of the sealing nut one 7 close to the hydraulic cylinder body 3 is provided with an ED sealing ring one 27, and the side of the sealing nut one 7 provided with the ED sealing ring one 27 is close to the end face of the hydraulic cylinder body 3 to prevent hydraulic oil from leaking out of the joint surface between the front face of the sealing nut one 7 and the hydraulic cylinder body 3; the cover-shaped sealing nut 8 is sleeved on the outside of the adjusting screw 6 through the threaded hole, the cover-shaped sealing nut 8 is provided with a threaded hole in the axial direction, and the side of the cover-shaped sealing nut 8 in contact with the sealing nut one 7 is provided with an ED sealing ring two 28, and the side of the cover-shaped sealing nut 8 provided with the ED sealing ring two 28 is close to the sealing nut one 7 to prevent hydraulic oil from leaking out of the joint surface between the front face of the cover-shaped sealing nut 8 and the back face of the sealing nut one 7.

[0038] In a further embodiment, referring to Figure 3 , the box body 1 is provided with a radial stepped hole, the stepped hole comprises a lower shaft hole and an upper shaft hole, the lower shaft hole of the stepped hole is provided with an oil groove and an O-shaped ring one 29, the gear 13 is provided with an upper shaft and a lower shaft on both sides respectively, the gear 13 and the shafts on both sides thereof are integrated, the gear 13 is arranged on the outer circumference of the shafts, the lower shaft of the gear 13 extends into and is sealingly connected with the lower shaft hole of the box body 1, and the lower end face of the gear 13 is close to the end face of the lower shaft hole of the box body 1, the end of the lower shaft is provided with a shaft hole for driving the valve rod of the valve, the upper shaft of the gear 13 extends into the upper shaft hole of the box body 1, and the gear 13 is provided with a gear gland 14 sleeved on the upper shaft, the inner side of the gear gland 14 is sealingly connected with the upper shaft, the outer side of the gear gland 14 is sealingly connected with the inner wall of the box body 1, and the end of the upper shaft is provided with an interface of NAMUR installation standard;

[0039] The gear gland 14 is provided with a stepped outer circle, a stepped shaft hole and a flange, one end of the stepped outer circle is connected with one end of the flange, the stepped outer circle is provided with an O-ring five 30 used for matching with the shaft hole on the box body 1, the stepped shaft hole is divided into an inner hole and an outer hole, the inner hole is a hole in the middle of the stepped outer circle, and the outer hole is a hole in the middle of the flange, the flange is provided with a screw hole used for mounting the flat bolt 19, the inner hole is sleeved on the upper shaft of the gear 13 and is fixed on the top of the box body 1 through the flat bolt 19, the stepped shaft hole is provided with an oil groove and an O-ring six 31 matched with the upper shaft of the gear 13, the inner hole of the stepped hole of the gear gland 14 is sleeved on the upper shaft of the gear 13, the flange of the gear gland 14 is fixed on the top of the box body 1, and the lower end surface of the gear gland 14 limits the radial movement of the upper end surface of the gear 13, so that the gear 13 can only make a rotary motion through the meshing of the teeth of the gear 13 and the middle rack of the piston rod 2, and the outer hole of the stepped hole of the gear gland 14 is sealed and blocked through the sealing cover 15, and the ED sealing ring three 32 is arranged between the gear gland 14 and the sealing cover 15 for sealing.

[0040] The surface of the box body 1 radially located below is a lower plane, and the surface of the box body 1 radially located above is an upper plane, the lower plane is provided with ISO5211 standard screw holes around the lower shaft hole of the stepped hole of the box body 1, the upper plane is provided with screw hole one used for mounting the gear gland 14 around the upper shaft hole of the stepped hole of the box body 1, the flat bolt 19 is fixed in the screw hole one, and the upper plane is further provided with screw hole two used for mounting the valve feedback bracket around the upper shaft hole of the stepped hole of the box body 1, and the sealing bolt 20 is blocked in the screw hole two.

[0041] According to the mechanical design manual - connection and fastening, the bolt torque calculation formula T=kFd, F is the pre-tightening force, that is, the axial force of the bolt, T is the torque, k is the torque coefficient, and d is the nominal diameter of the bolt, the axial force of the bolt can be obtained by bringing in the data.

[0042] The threaded hole diameter of the end surface of the hydraulic cylinder body 3 is 33-75% of the inner diameter of the hydraulic cylinder body 3, and the screw length of the threaded hole is 8-14P, so as to improve the load capacity of the threaded hole. On the premise that the machining accuracy of the threaded hole is not less than 6H, the threaded hole is recommended to be processed by extrusion processing, and the strength of the threaded surface is improved. On the premise that the machining accuracy of the external thread is not less than 6h, the adjusting screw 6 is recommended to be processed by rubbing, so as to improve the strength of the threaded surface. The thrust for pushing the piston rod 2 to move can be controlled within 25% of the theoretical data of the axial force of the adjusting screw 6.

[0043] The working principle of the utility model is as follows:

[0044] The conventional opening and closing control function of the actuator of the utility model is as follows: Figure 2As shown: in the case of normal input hydraulic source, the hydraulic oil is input to the first oil port A, the hydraulic oil is injected into the inner cavity of the left hydraulic cylinder body 3 through the oil path on the left side of the box body 1 and the oil path of the left hydraulic cylinder body 3 (the oil path of the box body 1 and the pressure tap 18 is blocked by the pressure tap 18, the oil path of the box body 1 and the needle valve 17 is sealed and blocked by the needle valve 17, O-shaped ring eight 35 and O-shaped ring seven 34, the first joint 10 installed on the box body 1 and the second joint 12 installed on the hydraulic cylinder body 3 make the hydraulic oil flow only through the seamless steel pipe 11 between the first oil port A of the box body 1 and the inner cavity of the hydraulic cylinder body 3), the hydraulic cylinder body 3 and the sealing nut one 7 are sealed by the ED sealing ring one 27, and the sealing nut one 7 and the cover-shaped sealing nut 8 are sealed by the ED sealing ring two 28, so that the left piston 4 is pushed to move the piston rod 2 to the right, the hydraulic oil in the right hydraulic cylinder body 3 is discharged from the second oil port B, and the rack arranged on the piston rod 2 controls the gear 13 to rotate counterclockwise through the meshing movement of the gear 13, so that the hydraulic actuator realizes the normal opening function of the valve.

[0045] Similarly, the hydraulic oil is input to the second oil port B, the hydraulic oil is injected into the inner cavity of the right hydraulic cylinder body 3 through the oil path on the right side of the box body 1 and the oil path of the right hydraulic cylinder body 3 (the oil path of the box body 1 and the pressure tap 18 is blocked by the pressure tap 18, the oil path of the box body 1 and the needle valve 17 is sealed and blocked by the needle valve 17, O-shaped ring eight 35 and O-shaped ring seven 34, the first joint 10 installed on the box body 1 and the second joint 12 installed on the hydraulic cylinder body 3 make the hydraulic oil flow only through the seamless steel pipe 11 between the second oil port B of the box body 1 and the inner cavity of the hydraulic cylinder body 3), the hydraulic cylinder body 3 and the sealing nut one 7 are sealed by the ED sealing ring one 27, and the sealing nut one 7 and the cover-shaped sealing nut 8 are sealed by the ED sealing ring two 28, so that the right piston 4 is pushed to move the piston rod 2 to the left, the hydraulic oil in the left hydraulic cylinder body 3 is discharged from the first oil port A, and the rack arranged on the piston rod 2 controls the gear 13 to rotate clockwise through the meshing movement of the gear 13, so that the hydraulic actuator realizes the normal closing function of the valve.

[0046] The actuator has the functions of precise control of conventional opening and closing stroke: the adjusting screw 6 is arranged in the threaded hole of the left hydraulic cylinder body 3 of the box body 1, the depth of the adjusting screw 6 into the hydraulic cylinder body 3 can be adjusted by rotating the adjusting screw 6, the movement position of the piston rod 2 to the left is limited by the end face of the adjusting screw 6, the rack arranged on the piston rod 2 meshes with the tooth surface of the gear 13, and the stop angle of the gear 13 when rotating counterclockwise is accurately limited, so that the precise limiting function of the actuator stroke is achieved.

[0047] Similarly, the threaded hole of the hydraulic cylinder body 3 located at the right side of the box body 1 is provided with an adjusting screw 6, the depth of the adjusting screw 6 into the hydraulic cylinder 3 can be adjusted by rotating the adjusting screw 6, the movement position of the piston rod 2 to the right is limited by the end face of the adjusting screw 6, the rack arranged on the piston rod 2 is engaged with the tooth surface of the gear 13, the stop angle of the gear 13 when rotating clockwise is accurately limited, and the accurate limiting function of the actuator stroke is achieved.

[0048] The utility model discloses have the emergency manual switch control function: the first oil port A no hydraulic oil input condition, unload the left side's cover sealing nut 8, through the rotation adjusting screw 6, make the end face of adjusting screw 6 in the hydraulic cylinder body 3 push the piston rod 2 and move to the right, the rack arranged on the piston rod 2 is engaged with the gear 13, control the counterclockwise rotation of gear 13, realize the manual operation of valve emergency opening;

[0049] Similarly, the threaded hole of the hydraulic cylinder body 3 located at the right side of the box body 1 is provided with an adjusting screw 6, the depth of the adjusting screw 6 into the hydraulic cylinder 3 can be adjusted by rotating the adjusting screw 6, the movement position of the piston rod 2 to the right is limited by the end face of the adjusting screw 6, the rack arranged on the piston rod 2 is engaged with the tooth surface of the gear 13, the stop angle of the gear 13 when rotating clockwise is accurately limited, and the accurate limiting function of the actuator stroke is achieved.

[0050] The utility model discloses have the emergency manual switch control function: the first oil port A no hydraulic oil input condition, unload the left side's cover sealing nut 8, through the rotation adjusting screw 6, make the end face of adjusting screw 6 in the hydraulic cylinder body 3 push the piston rod 2 and move to the right, the rack arranged on the piston rod 2 is engaged with the gear 13, control the counterclockwise rotation of gear 13, realize the manual operation of valve emergency opening;

[0051] The utility model discloses have the emergency manual switch control function: the first oil port A no hydraulic oil input condition, unload the left side's cover sealing nut 8, through the rotation adjusting screw 6, make the end face of adjusting screw 6 in the hydraulic cylinder body 3 push the piston rod 2 and move to the right, the rack arranged on the piston rod 2 is engaged with the gear 13, control the counterclockwise rotation of gear 13, realize the manual operation of valve emergency opening;

[0052] The utility model discloses have the emergency manual switch control function: the first oil port A no hydraulic oil input condition, unload the left side's cover sealing nut 8, through the rotation adjusting screw 6, make the end face of adjusting screw 6 in the hydraulic cylinder body 3 push the piston rod 2 and move to the right, the rack arranged on the piston rod 2 is engaged with the gear 13, control the counterclockwise rotation of gear 13, realize the manual operation of valve emergency opening;

[0053] The utility model adopts full sealing structure, all the parts between bearing internal and external air pressure effect all adopt O type ring or ED sealing ring to carry out the sealing, all the parts that can contact seawater are optimized seawater corrosion resistant material, the minimum air pressure of recommending air tightness test is 8Bar and should not have leakage condition for 30 minutes, even is 8Bar positive pressure 12 hours, negative pressure 12 hours, cannot appear leakage condition, ensure that hydraulic actuator can dive into deeper seawater below, from the angle of safety production, if the minimum pressure of air tightness test is greater than or equal to 10Bar, recommend O type ring plus stop ring to increase the safety factor, or use ED sealing ring to carry out the sealing, or change to use the sealing element of higher pressure resistance, the maximum possiblely avoid the occurrence of personal injury accident.

[0054] When the part that can contact seawater is changed to carbon steel or nodular cast iron material, sealing glue must be coated on the joint surface of actuator outer surface to fill the gap first, and then anticorrosive paint is sprayed on the outer surface of actuator after complete solidification, and the coating thickness should be greater than or equal to 250um.

[0055] It should be noted that the above examples are only used to illustrate the technical solutions of the utility model and are not limited. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and they should be covered in the scope of the claims of the utility model.

Claims

1. A hydraulic actuator suitable for use in a deep sea environment, characterised in that, The utility model provides a kind of hydraulic cylinder, including box (1), the box (1) is equipped with piston rod hole being passed through left and right end face and being arranged relative to two end surface axis direction, piston rod (2) is passed in the piston rod hole and can be moved along the direction of penetration, the middle of piston rod (2) is equipped with rack, box (1) is equipped with gear (13) that can rotate, the rack is engaged with gear (13), the box (1) side corresponding to piston rod hole is equipped with cylinder guiding hole, the both ends of piston rod (2) are respectively equipped with hydraulic cylinder (3), the both ends of piston rod (2) are respectively equipped with and fixed relative to the piston (4) of the left-right symmetry of box (1), the inside of piston (4) is sealedly connected with piston rod (2), the outside of piston (4) is sealedly movably connected with the inner wall of hydraulic cylinder (3), one end of hydraulic cylinder (3) is sealedly connected with cylinder guiding hole, and is sealed and tight by sealing nut three (9), and the other end is equipped with stroke adjusting structure, one end of stroke adjusting structure is in contact with the end surface of piston rod (2), the oil port on the side surface of box (1) and the hydraulic cylinder (3) on the both sides of piston rod (2) are equipped with, the oil port on the box (1) is connected with the oil port on the hydraulic cylinder (3) by joint and seamless steel tube (11), so that the oil circuit of hydraulic cylinder (3) is communicated with the oil circuit of box (1), the oil circuit in the box (1) is equipped with first branch and second branch extending to the surface of box (1), the first branch is equipped with needle valve (17), and the second branch is equipped with pressure measuring connector (18).

2. Hydraulic actuator suitable for deep-sea environment according to claim 1, characterized in that, The needle valve (17) is located on one end outside the box (1) and is equipped with sealing nut two (16) for sealingly connecting the needle valve (17) with the box (1).

3. The hydraulic actuator suitable for deep-sea environment according to claim 1, characterized in that, The stroke adjusting structure includes adjusting screw (6), the end surface of hydraulic cylinder (3) away from the box (1) is equipped with threaded hole, the adjusting screw (6) passes through the threaded hole and is opposite to the end part of piston rod (2) in the hydraulic cylinder (3), part of the adjusting screw (6) extends into the inner cavity of the hydraulic cylinder (3), and the other part of the adjusting screw (6) is exposed outside the hydraulic cylinder (3), the adjusting screw (6) is sleeved with cover-shaped sealing nut (8) on one end outside the hydraulic cylinder (3), and the cover-shaped sealing nut (8) is sealingly connected with the end surface of the hydraulic cylinder (3).

4. Hydraulic actuator suitable for deep-sea environment according to claim 3, characterized in that, The adjusting screw (6) is sleeved with sealing nut one (7) on part outside the hydraulic cylinder (3), and the sealing nut one (7) is arranged between the cover-shaped sealing nut (8) and the hydraulic cylinder (3) and is sealingly connected with the cover-shaped sealing nut (8) and the hydraulic cylinder (3) respectively.

5. The hydraulic actuator suitable for deep-sea environment according to claim 1, characterized in that, The outer circle of the piston (4) is equipped with support ring (26) and hydraulic oil seal, and the support ring (26) and the hydraulic oil seal are attached to the inner wall of the hydraulic cylinder (3).

6. Hydraulic actuator suitable for deep-sea environment according to claim 5, characterized in that, The piston rod (2) is stepped shaft at both ends, the stepped shaft is provided with threads, the piston (4) is provided with stepped hole which is same as the shape of the stepped shaft at both ends of the piston rod (2), the stepped hole of the piston (4) is on the end face of the stepped shaft of the piston rod (2) and is screwed together with the piston rod (2), the other side of the piston (4) is provided with nut (5), and the piston (4) is tightened on the stepped shaft through the nut (5).

7. The hydraulic actuator suitable for deep-sea environment according to claim 1, characterized in that, The box (1) is provided with radial stepped hole, the stepped hole includes lower shaft hole and upper shaft hole, the lower shaft hole of the stepped hole is provided with oil groove, the both sides of the gear (13) are provided with upper shaft and lower shaft, the lower shaft of the gear (13) is inserted into and sealedly connected with the lower shaft hole of the box (1), the end of the lower shaft is provided with shaft hole for driving the valve rod, the upper shaft of the gear (13) is inserted into the upper shaft hole of the box (1), the upper shaft is provided with gear gland (14), the inner side of the gear gland (14) is sealedly connected with the upper shaft, the outer side of the gear gland (14) is sealedly connected with the inner wall of the box (1), the end of the upper shaft is provided with NAMUR installation standard interface.

8. Hydraulic actuator suitable for deep-sea environment according to claim 7, characterized in that, The gear gland (14) is provided with stepped outer circle, stepped shaft hole and flange, one end of the stepped outer circle is connected with one end of the flange, the stepped shaft hole is divided into inner hole and outer hole, the inner hole is the hole in the middle of the stepped outer circle, the outer hole is the hole in the middle of the flange, the inner hole of the stepped hole of the gear gland (14) is sleeved on the upper shaft of the gear (13), the flange of the gear gland (14) is fixed on the top of the box (1), the lower end face of the gear (13) is close to the end face of the lower shaft hole of the box (1), the lower end face of the gear gland (14) limits the radial movement of the upper end face of the gear (13), the outer hole of the stepped hole of the gear gland (14) is sealedly plugged by the sealing cover (15).

9. The hydraulic actuator suitable for deep-sea environment according to claim 8, characterized in that, The lower shaft hole of the stepped hole of the box (1) is provided with screw hole, the upper shaft hole of the stepped hole of the box (1) is provided with screw hole one for installing the gear gland (14), the flat bolt (19) is fixed in the screw hole one, the upper shaft hole of the stepped hole of the box (1) is also provided with screw hole two for installing the valve feedback bracket, the sealing bolt (20) is plugged in the screw hole two.

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