Actuators, hydraulic devices

Abstract

The utility model discloses an actuator and a hydraulic device. The actuator comprises: a first cylinder body; a second cylinder body, which is detachably connected to the first cylinder body; and a third cylinder body, which is located on the side of the second cylinder body opposite to the first cylinder body, is partially disposed in the second cylinder body and is detachably connected to the second cylinder body. The actuator of the utility model is compact in size, which has advantages in occasions where the installation space is limited, and its locking device has a self-locking function. After reaching the locking position, the locking device is self-locking, and the force driving the locking device does not directly act on the surface of the object to be limited, thereby reducing damage to the object to be limited, and the locking is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, in particular to an actuator and a hydraulic device comprising the actuator. Background Art

[0002] In order for the actuator to provide sufficient actuating force, the size of the actuator product is usually relatively large, making it difficult to apply the actuator to fields that have restrictions on volume. For example, Floating Production Storage and Offloading (FPSO) is used in offshore oil and gas related fields. In its side support system, a limit device is required to limit the watertight pipe supported by the support pipe to avoid being affected by the surge of seawater. However, the limit device of FPSO is used underwater, and its volume should not be too large, which makes it impossible to use the actuator to realize automatic control of the limit device, and it can only rely on manual operation, which is complicated to operate, has poor reliability, and also has safety hazards.

[0003] In order to apply the actuator to an underwater environment, it is necessary to reduce the size of the actuator while ensuring that the actuator can provide sufficient actuating force. Utility Model Content

[0004] The utility model provides an actuator and a hydraulic device comprising the actuator.

[0005] Specifically, the utility model provides an actuator, comprising: a first cylinder body; a second cylinder body, which is detachably connected to the first cylinder body; and a third cylinder body, which is located on the side of the second cylinder body opposite to the first cylinder body, is partially disposed in the second cylinder body and is detachably connected to the second cylinder body.

[0006] In the actuator, a connecting member for connecting the second cylinder body with the first cylinder body is located outside the second cylinder body, and a connecting member for connecting the second cylinder body with the third cylinder body is located inside the second cylinder body.

[0007] In the actuator, the connecting member for connecting the second cylinder body with the first cylinder body is a bolt, connecting the flange part of the second cylinder body with the first cylinder body, and the connecting member for connecting the second cylinder body with the third cylinder body is a bolt, which is screwed into the threaded holes of the second cylinder body and the third cylinder body from the side close to the first cylinder body.

[0008] The actuator also includes: a piston component, which is located inside the first cylinder body; an inner sleeve, which is fixedly connected to the first cylinder body at one end away from the second cylinder body; an axial sleeve, which is fixedly connected to the piston component at one end close to the second cylinder body; a driving bolt, which passes through the first cylinder body; and a locking device, which is located inside the second cylinder body and the third cylinder body, fixedly connected to the driving bolt and is pushed by the driving bolt to apply a locking force to the object to be limited.

[0009] In the actuator, the longitudinal cross-section of the piston component is T-shaped, and a first end cover is arranged between the piston component and the first cylinder body, and the first end cover is connected to the internal thread of the first cylinder body through an external thread; a second end cover is arranged between the piston component and the inner sleeve, and the second end cover is connected to the external thread of the inner sleeve through an internal thread.

[0010] In the actuator, the longitudinal section of the piston component is L-shaped, a first end cover is provided between the piston component and the first cylinder body, and the first end cover is connected to the internal thread of the first cylinder body through an external thread.

[0011] The actuator also includes: a spring retainer, which is arranged on the outer periphery of the axial sleeve, and the spring retainer is threadedly connected to the piston component, so as to fixedly connect the piston component and the axial sleeve; a retaining member, which is arranged on the inner periphery between the first cylinder body and the second cylinder body; and a limit spring, which is fixed to the spring retainer and abuts against the retaining member, so that a predetermined thrust is required to deform the limit spring to enter the interior of the retaining member.

[0012] The actuator further comprises: a spring pressure cover which is threadedly connected to the spring retainer, and the V-shaped spring is installed in a groove formed between the spring pressure cover and the spring retainer.

[0013] In the actuator, the material of the retaining member is copper.

[0014] In the actuator, the inner sleeve includes a first flange portion and a first tubular portion extending from the first flange portion, the first flange portion is fixedly connected to the first cylinder body at a first end of the first cylinder body, and the piston component is sleeved on the first tubular portion.

[0015] In the actuator, the first flange portion is formed with a step portion on a side opposite to the first tubular portion, and the step portion matches an inner flange of the first end of the first cylinder.

[0016] In the actuator, the piston component includes a second flange portion and a second tubular portion extending from the second flange portion. When the piston component is sleeved on the first tubular portion of the inner sleeve, the second flange portion faces the first flange portion and the second flange portion forms a tight contact with the inner surface of the first cylinder body; the first flange portion is formed with an outer conical surface on the side facing the first tubular portion, and the second flange portion is formed with an inner conical surface facing the first flange portion, and the inner conical surface cooperates with the outer conical surface to limit the position of the piston component.

[0017] In the actuator, a through hole is opened on the side wall of the second cylinder body to connect the inside of the second cylinder body with the outside.

[0018] In the actuator, a copper sleeve is sleeved in at least a portion of the through hole.

[0019] In the actuator, the locking device includes: a push head, which is used to contact the object to be limited, the push head is an open cylindrical shape with a cavity, and a plurality of openings penetrating the side wall are arranged on the side wall of the push head; a core shaft, which is located in the cavity of the push head and has a conical outer peripheral surface; and a support shoe, which is installed in the opening, and the inner peripheral surface of the support shoe includes a reducing portion, and the opening radius of the reducing portion gradually decreases in the direction approaching the push head; a retaining ring; the core shaft presses the support shoe radially so that the support shoe contacts the retaining ring to generate a locking force.

[0020] In the actuator, the locking device further comprises: the retaining ring is radially located between the push head and the third cylinder body and is fixed to the third cylinder body.

[0021] In the actuator, the retaining ring is integral with the third cylinder.

[0022] In the actuator, the material of the retaining ring is beryllium copper.

[0023] In the actuator, the locking device also includes: an end piece, which is fixedly connected to the core shaft; and a V-shaped spring, which is arranged between the core shaft and the end piece. The outer diameter of the V-shaped spring matches the inner diameter of the limiting structure of the push head, and a predetermined thrust is required to push the core shaft into the interior of the push head.

[0024] In the actuator, the V-shaped spring is a disc spring with a V-shaped cross section. At the outer end of the V-shaped cross section, the V-shaped spring has a plurality of evenly distributed slits, and between adjacent slits are elastic claws that abut against the protrusion of the push head.

[0025] In the actuator, the end of the third cylinder body away from the second cylinder body is provided with a fixing flange and a mounting flange, and the mounting flange is detachably mounted on the fixing flange.

[0026] The embodiment of the utility model further provides a hydraulic device, which includes at least one actuator as described above; the actuator is installed on the side wall of the hydraulic device; the actuator is used to limit the position of the object to be limited supported by the hydraulic device.

[0027] The actuator of the utility model is compact in size and has advantages in occasions where the installation space is limited. The utility model has improved integration, a compact structure, and light weight, and is particularly suitable for underwater suspension devices. In the actuator and hydraulic device of the utility model, during the locking process of the locking device, after the push head contacts the object to be limited (i.e., reaches the predetermined position), the core shaft continues to move axially under the action of the driving force. During the axial movement of the core shaft, the support shoe is squeezed and moves radially, and the outer diameter of the support shoe is deformed under the constraint of the retaining ring, thereby generating a locking force. Therefore, the force driving the locking device does not directly act on the surface of the object to be limited, reducing damage to the object to be limited; the core shaft, support shoe and retaining ring can achieve self-locking, and the locking reliability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of an actuator in an embodiment of the utility model;

[0029] Figure 2 is a three-dimensional schematic diagram of a first cylinder in the actuator;

[0030] Figure 3 is a front cross-sectional view of a first cylinder in the actuator;

[0031] Figure 4 is a three-dimensional schematic diagram of the second cylinder and the third cylinder in the actuator;

[0032] Figure 5 is an exploded schematic diagram of the connection between the second cylinder body and the third cylinder body in the actuator;

[0033] Figure 6 is a front cross-sectional view of a second cylinder block and a third cylinder block in the actuator;

[0034] Figure 7 It is a front cross-sectional view of an actuator in an embodiment of the utility model;

[0035] Figure 8 yes Figure 7 A front view of the inner sleeve in the actuator shown;

[0036] Fig. 9 This is a front cross-sectional view of a locking device in an embodiment of the utility model;

[0037] Fig.10 It is a front sectional view of another locking device in an embodiment of the utility model. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0039] Example embodiments will be described more fully below with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present invention thorough and complete and to enable those skilled in the art to fully understand the scope of the present invention.

[0040] In the absence of conflict, the various embodiments of the present invention and the various features therein may be combined with each other.

[0041] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0042] The terms used herein are only used to describe specific embodiments and are not intended to limit the utility model. As used herein, the singular forms "a", "an" and "the" are also intended to include plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded.

[0043] The embodiments described herein may be described with reference to plan views and / or cross-sectional views by means of ideal schematic diagrams of the present invention. Therefore, the example illustrations may be modified according to manufacturing techniques and / or tolerances. Therefore, the embodiments are not limited to the embodiments shown in the drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the drawings have schematic properties, and the shapes of the regions shown in the drawings illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined herein.

[0045] Figures 1 to 6is a schematic diagram of an actuator in an embodiment of the utility model, wherein: Figure 1 is the front view of the actuator, Figure 2 is a three-dimensional schematic diagram of the first cylinder in the actuator, Figure 3 is a front cross-sectional view of the first cylinder in the actuator, Figure 4 It is a three-dimensional schematic diagram of the second cylinder body and the third cylinder body. Figure 5 This is a schematic diagram of the connection between the second cylinder block and the third cylinder block. Figure 6 It is a front cross-sectional view of the second cylinder block and the third cylinder block.

[0046] In the embodiment of the utility model, the actuator includes a first cylinder 11; a second cylinder 12, which is detachably connected to the first cylinder 11; and a third cylinder 13, which is located on the side of the second cylinder 12 opposite to the first cylinder 11 and is detachably connected to the second cylinder 12.

[0047] In some embodiments, the connecting member for connecting the second cylinder 12 with the first cylinder 11 is located outside the second cylinder 12 , and the connecting member for connecting the second cylinder 12 with the third cylinder 13 is located inside the second cylinder 12 .

[0048] In some embodiments, the connecting member used to connect the second cylinder body 12 and the first cylinder body 11 is a bolt, which connects the flange part of the second cylinder body 12 and the first cylinder body 11; the connecting member used to connect the second cylinder body 12 and the third cylinder body 13 is a bolt, which is screwed into the threaded holes of the second cylinder body 12 and the third cylinder body 13 from the side close to the first cylinder body 11.

[0049] In some embodiments, the actuator provided by the embodiments of the present disclosure is an actuator for use in water.

[0050] Figure 7 It is a front cross-sectional view of an actuator in an embodiment of the utility model.

[0051] In some embodiments, in order to achieve a compact structure, the first cylinder body 11 is used as the oil cylinder 100 of the actuator, the second cylinder body 12 can be implemented as a fixed flange 200 detachably connected to the oil cylinder 100, and the third cylinder body 13 can be implemented as a fixed flange 300, which is located on the side of the fixed flange 200 opposite to the oil cylinder 100 and is detachably connected to the fixed flange 200. The connector for connecting the fixed flange 200 and the oil cylinder 100 is located outside the fixed flange 200, and the connector for connecting the fixed flange 200 and the fixed flange 300 is located inside the fixed flange 200.

[0052] In some embodiments, the bolts used to connect the fixing flange 200 and the cylinder 100 are connected to the flange parts of the fixing flange 200 and the cylinder 100, so that the cylinder 100 and the fixing flange 200 are detachably connected; the bolts used to connect the fixing flange 200 and the fixing flange 300 are screwed into the threaded holes of the fixing flange 200 and the fixing flange 300 from the side close to the cylinder 100, so that the fixing flange 200 and the fixing flange 300 are detachably connected.

[0053] By adopting the structure as described above, the structure of the actuator can be made more compact, which can reduce the volume and weight, and is more suitable for underwater environments.

[0054] In some embodiments, the actuator further includes a mounting flange 400 , which is detachably mounted on the fixing flange 300 ; the mounting flange 400 is used to mount the actuator on a hydraulic device.

[0055] In some embodiments, a fixing flange and a mounting flange are provided at one end of the third cylinder body 13 away from the second cylinder body 12 , and the mounting flange is detachably mounted on the fixing flange; the mounting flange is used to mount the actuator on the hydraulic device.

[0056] In the disclosed embodiment, the mounting flange is not limited to the above embodiment. For example, the mounting flange can also be set in the middle position of the third cylinder body 13, or between the second cylinder body 12 and the second cylinder body 13, or in the middle position of the second cylinder body 12, etc.

[0057] In the embodiment of the utility model, the actuator further comprises: a piston component 2, located inside the first cylinder 11; an inner sleeve 3, fixedly connected to the first cylinder 11 at one end away from the second cylinder 12; an axial sleeve 4, fixedly connected to the piston component 2 at one end close to the second cylinder 12; a driving bolt 5, which passes through the first cylinder 11; a locking device 6, located inside the second cylinder 12 and the third cylinder 13, and coupled to the driving bolt 5. The driving bolt 5 can be driven by the piston component 2 to move axially, and the driving bolt 5 can also be moved axially by manual operation; when the driving bolt 5 moves axially, it will drive the locking device 6 to move axially, thereby limiting the position of the object to be limited.

[0058] Figure 8 yes Figure 7 A front view of the inner sleeve in the actuator is shown.

[0059] In some embodiments, the inner sleeve 3 includes a first flange portion 3a and a first tubular portion 3b extending from the first flange portion 3a, the first flange portion 3a is fixedly connected to the first cylinder body 11 at the first end of the first cylinder body 11, and the piston component 2 is sleeved on the first tubular portion 3b. The first flange portion 3a is formed with a stepped portion 3d on the side opposite to the first tubular portion 3b, and the stepped portion 3d matches the inner flange of the first end of the first cylinder body 11.

[0060] In some embodiments, the piston component 2 includes a second flange portion 2a and a second tubular portion 2b extending from the second flange portion 2a, that is, the longitudinal section of the piston component 2 is L-shaped. The end cover 8 is installed between the tubular portion 2b of the piston component 2 and the first cylinder body 11, and the end cover 8 is connected to the internal thread of the first cylinder body 11 through an external thread. When the piston component 2 is sleeved on the first tubular portion 3b of the inner sleeve 3, the second flange portion 2a faces the first flange portion 3a and the second flange portion 2a forms a close contact with the inner surface of the first cylinder body 11; the first flange portion 3a is formed with an outer conical surface 3f on one side facing the first tubular portion 3b (at the corner between the first flange portion 3a and the first tubular portion 3b), and the second flange portion 2a is formed with an inner conical surface 2c facing the first flange portion 3a, and the inner conical surface 2c cooperates with the outer conical surface 3f to limit the position of the piston component 2.

[0061] In the embodiments of the present disclosure, the structure of the inner sleeve 3 is not limited to the above embodiments, and those skilled in the art can change its structure according to specific applications, and the structure and its changes also fall within the protection scope of the present disclosure. For example, in one embodiment, a concave arc-shaped chamfered portion can be formed at the corner between the first flange portion 3a and the first tubular portion 3b, and accordingly, an arc-shaped fillet portion is formed on the inner hole at one end of the piston component 2 that contacts the first flange portion 3a of the inner sleeve 3. At the starting position, the fillet portion fits against the chamfered portion of the inner sleeve 3. In another embodiment, the corner between the first flange portion 3a and the first tubular portion 3b is a right-angle transition, and accordingly, the inner hole edge at one end of the piston component 2 that contacts the first flange portion 3a of the inner sleeve 3 is a right-angle transition.

[0062] In some embodiments, a sealing cover 7 may be further provided between the first flange portion 3a of the inner sleeve 3 and the driving bolt 5. A concave cavity 3e is formed on the first flange portion 3a of the inner sleeve 3, and the sealing cover 7 is sleeved on the driving bolt 5 and received in the concave cavity 7e on the first flange portion 3a of the inner sleeve 3, and forms a close contact with the outer surface of the driving bolt 5 and the inner circumference of the concave cavity 3e. The sealing cover 7 may be fastened to the inner sleeve 3 by screws, or may be fixed to the inner sleeve 3 by mutual engagement of the external thread on the sealing cover 7 and the internal thread on the inner circumference of the concave cavity 3e. In order to make the sealing cover 7 form a close contact with the outer surface of the driving bolt 5, the driving bolt 5 further includes a supporting portion provided between the threaded portion and the operating portion and having a smooth outer surface, for supporting the sealing cover 7.

[0063] In some embodiments, when the actuator is used underwater or in an atmosphere with corrosive gases, in order to achieve the purpose of waterproofing or corrosion resistance, a sealing ring can be set between the matching surfaces of the hydraulic components, for example, between the matching surfaces of the inner sleeve 3 and the cylinder body 11 and the sealing cover 7, and between the matching surfaces of the piston component 2 and the end cover 8 and the inner sleeve 3, so as to meet the use requirements in a specific environment and reduce the waterproof and corrosion resistance requirements for core components. It should be understood that those skilled in the art can set fewer or more sealing rings according to actual needs. In order to facilitate the installation of the sealing ring, a groove for fixing the sealing ring can be set on the surface of the corresponding component as needed.

[0064] Fig. 9 It is a front sectional view of a locking device in an embodiment of the utility model.

[0065] In the embodiment of the utility model, the locking device 6 includes a push head 61 , a core shaft 62 , a support shoe 63 , a retaining ring 64 , and an end piece 65 .

[0066] The end piece 65 is provided with an inner hole; the driving bolt 5 passes through the inner hole of the end piece 65 in a direction away from the core shaft 62; the end piece 65 is fixedly connected to the core shaft 62, thereby fixing the core shaft 62 to the driving bolt 5. The axial movement of the driving bolt 5 will drive the core shaft 63 to move axially.

[0067] The surface of the mandrel 62 has a certain taper, and the mandrel 62, the shoe 63, and the retaining ring 64 cooperate to form a self-locking. A reducing portion is provided on the inner circumference of the shoe 63, and the opening radius of the reducing portion gradually decreases in the direction close to the end face of the push head 61; the shoe 63 is squeezed by the mandrel 62 and moves radially, and the outer diameter of the shoe 63 is deformed under the constraint of the retaining ring 64, thereby generating a locking force. In some embodiments, the opening radius of the reducing portion of the inner circumference of the shoe 63 decreases nonlinearly in the direction close to the end face of the push head 61, and the reduction amplitude gradually increases. As the mandrel 62 moves close to the end face of the push head 61, it squeezes the shoe 63, so that the radial pressure generated by the shoe 63 under the constraint of the retaining ring 64 gradually increases, thereby generating a gradually increasing locking force.

[0068] The push head 61 is a cylindrical structure with an open mouth. A V-shaped spring 66 is arranged between the core shaft 62 and the end piece 65. The outer diameter of the V-shaped spring 66 matches the inner diameter of the limiting structure at the open mouth of the push head 61. A certain initial thrust is required to deform the V-shaped spring 66 so that the core shaft 62 can be further pushed into the push head 61. Before the push head 61 contacts the object to be limited, the force acting on the V-shaped spring 66 is less than the initial thrust, and the V-shaped spring 66 will not deform or deform slightly, and cannot enter the open mouth of the push head 61, so that the driving bolt 5 can both push the push head 61 to move to the right and prevent the core shaft 62 from being locked, thereby preventing the push head 61 from being locked before reaching the target position. When the push head 61 contacts the object to be limited, the force acting on the V-shaped spring 66 becomes greater than the initial thrust, the V-shaped spring 66 is squeezed and deformed, and the core shaft 62 continues to move to the right relative to the push head 61, thereby squeezing the support shoe 63 into contact with the retaining ring 64, producing self-locking, so that the push head can withstand the reaction force of the object to be limited.

[0069] In some embodiments, it is a disc spring with a V-shaped cross section. At the outer end of the V-shaped cross section, the booster spring has a plurality of evenly distributed slits, and between adjacent slits are elastic claws, which abut against the protrusion of the push head.

[0070] In some embodiments, the retaining ring 64 is an integral structure with the third cylinder 13 .

[0071] In some embodiments, the material of the retaining ring 64 can be selected according to the application environment of the actuator. For example, the material of the retaining ring 64 is a corrosion-resistant material such as beryllium copper.

[0072] In some embodiments, the surface where the retaining ring 64 contacts the support shoe 63 includes a structure that increases friction. The disclosed embodiments do not specifically limit the structure that increases friction. In some embodiments, the structure that increases friction is a covering provided on the surface where the retaining ring 64 contacts the support shoe 63, which can increase the friction between the contact surface between the retaining ring 64 and the support shoe. In some embodiments, the structure that increases friction is a structure obtained by surface treatment of the surface where the retaining ring 64 contacts the support shoe 63, for example, the surface where the retaining ring 64 contacts the support shoe 63 is a concave-convex structure, which can also increase the friction between the contact surface between the retaining ring 64 and the support shoe, thereby increasing the locking force.

[0073] In the embodiment of the present utility model, Figure 7 The limiting device shown has a manual mode and an automatic mode, and is a dual-mode limiting device.

[0074] The locking process in manual mode is described below.

[0075] In the starting position, the locking device 6 is in a retracted state.

[0076] The step of extending the push head 61 without load is as follows: by rotating the driving bolt 5, the locking device 6 is pushed to extend as a whole, and the push head 61 contacts the object to be limited, that is, reaches the predetermined position.

[0077] Locking steps: the push head 61 stops moving after contacting the object to be limited, and the driving bolt 5 continues to push the core shaft 62 to move axially. During the axial movement of the core shaft 62, the support shoe 63 is squeezed and moves radially. The support shoe 63 is deformed under the constraint of the retaining ring 64 and released from the retaining ring 64, generating a locking force to lock the push head 61 in a predetermined position. The push head 61 can withstand the reaction force of the object to be limited, thereby achieving the purpose of limiting the object to be limited.

[0078] The locking process in automatic mode is described below.

[0079] In the starting position, the locking device 6 is in a retracted state.

[0080] The steps of extending the push head 61 without load are as follows: the oil cylinder assembly is connected to the oil pressure to push the piston component 2 and the driving bolt 5 to move to the right, pushing the locking device 6 to extend as a whole, and the push head 61 contacts the restricted object, that is, reaches the predetermined position.

[0081] Locking steps: the push head 61 stops moving after contacting the object to be limited, and the piston component 2 continues to push the core shaft 62 to move axially. During the axial movement of the core shaft 62, the support shoe 63 is squeezed and moves radially. The support shoe 63 is deformed under the constraint of the retaining ring 64 and released from the retaining ring 64, generating a locking force to lock the push head 61 in a predetermined position. The push head 61 can withstand the reaction force of the object to be limited, thereby achieving the purpose of limiting the object to be limited.

[0082] Fig.10 It is a front sectional view of another locking device in an embodiment of the utility model.

[0083] Fig.10 The piston in the limit device shown is Figure 7 The piston components in the actuators shown have different structures and different ways of connecting the piston components to the axial sleeve.

[0084] In some embodiments, the piston component 2 includes a tubular portion, an outer flange portion and an inner flange portion arranged at one end of the tubular portion of the piston component 2 away from the end cover; the tubular portion of the piston component 2 is sleeved on the inner sleeve 3, the outer flange portion of the piston component 2 forms a tight contact with the inner wall of the first cylinder body 11, and the inner flange portion of the piston component 2 forms a tight contact with the outer wall of the inner sleeve 3; that is, the longitudinal cross-section of the piston component 2 is T-shaped. The end cover includes a first end cover 81 and a second end cover 82, the first end cover 81 is installed between the outer wall of the tubular portion of the piston component 2 and the inner wall of the first cylinder body 11; the second end cover 82 is installed between the inner wall of the tubular portion of the piston component 2 and the outer wall of the inner sleeve 3. The first end cover 81 is connected to the inner thread of the first cylinder body 11 through an external thread, and the second end cover 82 is connected to the outer thread of the inner sleeve 3 through an internal thread.

[0085] In some embodiments, a first bearing groove is provided at one end of the tubular portion of the piston component 2 close to the end cover, and a boss that matches the first bearing groove is provided on the flange portion of the axial sleeve 4. The actuator further includes a spring retainer 83, which is fixedly connected to one end of the tubular portion of the piston component 2 close to the end cover, and the boss is limited in the first bearing groove. In some embodiments, the spring retainer 83 is connected to the external thread of the piston component 2 through an internal thread.

[0086] The actuator also includes a retaining member 86 and a limit spring 85. The retaining member 86 is arranged on the inner periphery of the first cylinder body 11 and / or the second cylinder body 12. The limit spring 85 is fixed to the spring retaining frame 83 and abuts against the retaining member 86. Only when the thrust is greater than the predetermined thrust can the limit spring 85 be deformed and enter the retaining member 86, thereby keeping the piston component 2 in the initial position when the thrust is less than the predetermined thrust.

[0087] The actuator further comprises a spring pressure cap 84 , the internal thread of the spring pressure cap 84 is connected with the external thread of the spring retainer 83 , and the limit spring 85 is installed in a groove formed between the spring pressure cap 84 and the spring retainer.

[0088] In some embodiments, the limit spring 85 is a V-shaped spring. The cross section of the V-shaped spring is a disc-shaped spring, and at the outer end of the V-shaped cross section, the booster spring has a plurality of evenly distributed slits, and between adjacent slits are elastic claws, which abut against the protrusion of the push head.

[0089] In some embodiments, the material of the retainer 86 can be selected according to the application environment of the actuator. For example, when the actuator is used in water, the material of the retainer 86 can be copper.

[0090] In some embodiments, a through hole is formed on the side wall of the second cylinder 12 to connect the inside of the second cylinder with the outside.

[0091] In some embodiments, a copper sleeve is sleeved in at least part of the through hole. When the actuator is applied in water, the copper sleeve can release copper ions to prevent aquatic organisms from entering the second cylinder body 12 through the through hole.

[0092] The embodiment of the utility model further provides a hydraulic device, which includes at least one actuator as described above; the actuator is installed on the side wall of the hydraulic device; the actuator is used to limit the position of the object to be limited supported by the hydraulic device.

[0093] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly stated, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the scope of the present invention as set forth in the appended claims.

Claims

1. An actuator, characterized in that: include: First cylinder block; a second cylinder body, which is detachably connected to the first cylinder body; as well as The third cylinder body is located on a side of the second cylinder body opposite to the first cylinder body and is detachably connected to the second cylinder body.

2. The actuator according to claim 1, characterized in that The connecting piece for connecting the second cylinder body with the first cylinder body is located outside the second cylinder body, and the connecting piece for connecting the second cylinder body with the third cylinder body is located inside the second cylinder body.

3. The actuator according to claim 2, characterized in that The connecting member used to connect the second cylinder body with the first cylinder body is a bolt, connecting the flange part of the second cylinder body with the first cylinder body; The connecting piece used to connect the second cylinder body and the third cylinder body is a bolt, which is screwed into the threaded holes of the second cylinder body and the third cylinder body from the side close to the first cylinder body.

4. The actuator according to any one of claims 1 to 3, characterized in that: The actuator further comprises: A piston component, which is located inside the first cylinder; an inner sleeve fixedly connected to the first cylinder body at one end away from the second cylinder body; an axial sleeve fixedly connected to the piston member at one end close to the second cylinder body; a driving bolt extending through the first cylinder body; and The locking device is located inside the second cylinder body and the third cylinder body, is fixedly connected to the driving bolt and is pushed by the driving bolt to apply a locking force to the restricted object.

5. The actuator according to claim 4, characterized in that The longitudinal cross section of the piston component is L-shaped. An end cover is arranged between the piston component and the first cylinder body. The end cover is connected to the internal thread of the first cylinder body through an external thread.

6. The actuator according to claim 4, characterized in that The longitudinal cross-section of the piston component is T-shaped. A first end cover is arranged between the piston component and the first cylinder body, and the first end cover is connected to the internal thread of the first cylinder body through an external thread; a second end cover is arranged between the piston component and the inner sleeve, and the second end cover is connected to the external thread of the inner sleeve through an internal thread.

7. The actuator according to claim 6, characterized in that The actuator further comprises: a spring retainer, which is arranged on the outer periphery of the axial sleeve, and the spring retainer is threadedly connected to the piston component, so as to fixedly connect the piston component to the axial sleeve; a retainer disposed on an inner circumference of the first cylinder body and / or the second cylinder body; and A limit spring is fixed to the spring holder and abuts against the holder, and a predetermined thrust is required to deform the limit spring to enter the inside of the holder.

8. The actuator according to claim 7, characterized in that The actuator further comprises: A spring pressure cover is threadedly connected to the spring retainer, and the limit spring is installed in a groove formed between the spring pressure cover and the spring retainer.

9. The actuator according to claim 4, characterized in that: The inner sleeve includes a first flange portion and a first tubular portion extending from the first flange portion. The first flange portion is fixedly connected to the cylinder body at a first end of the first cylinder body, and the piston component is sleeved on the first tubular portion.

10. The actuator according to claim 9, characterized in that The first flange portion is formed with a step portion on a side opposite to the first tubular portion, and the step portion matches an inner flange of the first end of the first cylinder body.

11. The actuator according to claim 9, characterized in that The piston component comprises a second flange portion and a second tubular portion extending from the second flange portion, and when the piston component is sleeved on the first tubular portion of the inner sleeve, the second flange portion faces the first flange portion and the second flange portion forms a close contact with the inner surface of the first cylinder body; The first flange portion is formed with an outer conical surface on one side facing the first tubular portion, and the second flange portion is formed with an inner conical surface facing the first flange portion, and the inner conical surface cooperates with the outer conical surface to limit the position of the piston component.

12. The actuator according to any one of claims 1 to 3, characterized in that A through hole is opened on the side wall of the second cylinder body to connect the inside and the outside of the second cylinder body.

13. The actuator according to claim 12, characterized in that A copper sleeve is sleeved in at least part of the through hole.

14. The actuator according to claim 4, characterized in that The locking device comprises: A pusher head, which is used to contact the object to be limited, the pusher head is an open cylindrical shape with a cavity, and a plurality of openings penetrating the side wall are arranged on the side wall of the pusher head; a mandrel located in the cavity of the pusher head and having a conical outer peripheral surface; and A gripper shoe is installed in the opening, wherein the inner circumference of the gripper shoe comprises a reducing portion, and the opening radius of the reducing portion gradually decreases in a direction approaching the pusher head; Retaining ring; The core shaft compresses the support shoe in radial direction, so that the support shoe contacts the retaining ring and generates a locking force.

15. The actuator according to claim 14, characterized in that The retaining ring is located between the push head and the third cylinder body in the radial direction and is fixed on the third cylinder body.

16. The actuator according to claim 14, characterized in that The retaining ring is integral with the third cylinder.

17. The actuator according to claim 14, characterized in that The locking device also includes: an end piece fixedly connected to the mandrel; and A booster spring is arranged between the core shaft and the end piece. The outer diameter of the booster spring matches the inner diameter of the limiting structure of the push head. A predetermined thrust is required to push the core shaft into the push head.

18. The actuator according to any one of claims 1 to 3, characterized in that A fixing flange and a mounting flange are provided at one end of the third cylinder body away from the second cylinder body, and the mounting flange is detachably mounted on the fixing flange.

19. A hydraulic device, characterized in that: The hydraulic device comprises at least one actuator according to any one of claims 1 to 18; the actuator is mounted on a side wall of the hydraulic device; the actuator is used to limit a limited object supported by the hydraulic device.

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