Locking device and limiting actuator

Abstract

The utility model provides a locking device which comprises a push head used for making contact with a limited object. And the self-locking assembly is used for driving the push head to move axially and locking the push head after the push head is in contact with a limited object. The utility model further provides a limiting actuator applying the locking device. According to the limiting device, enough locking force can be provided to firmly fix the limited object, and the limited object can be prevented from being damaged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of mechanical equipment, and in particular to a locking device and a limit actuator including the locking device. Background Art

[0002] The limit device is used to limit and fix the load. For example, the support pipe on the side of a floating production storage and offloading vessel (FPSO) is used to support the riser. Since the riser is suspended underwater, it will be affected by the surge of seawater and needs to be fixed by a limit device.

[0003] However, the limit device usually needs to rely on manual operation, which has high requirements for manual operation. Insufficient locking force cannot fix the load, and excessive locking force may damage the load. Utility Model Content

[0004] Embodiments of the present disclosure provide a locking device and a limit actuator including the locking device.

[0005] In a first aspect, an embodiment of the present disclosure provides a locking device, comprising: a push head for contacting an object to be limited; and a self-locking component for driving the push head to move axially and locking the push head after the push head contacts the object to be limited.

[0006] In some embodiments, the self-locking assembly includes a core shaft, a support shoe, and a retaining ring; the core shaft radially presses the support shoe so that the support shoe contacts the retaining ring to generate a locking force.

[0007] In some embodiments, the pusher head includes a side wall and an end face for contacting the object to be limited, the end face and the side wall enclose a cavity; the core shaft is arranged in the cavity, and the outer circumferential surface of the core shaft is conical; a plurality of windows penetrating the side wall are opened on the side wall of the pusher head, the support shoe is installed in the window, and a reducing portion is arranged on the inner circumferential surface of the support shoe, and the opening radius of the reducing portion gradually decreases in the direction approaching the end face.

[0008] In some embodiments, the conical outer peripheral surface of the mandrel has a taper ranging from 0 degrees to 10 degrees.

[0009] In some embodiments, the support shoe includes a main body and mounting parts respectively located on both sides of the main body, the main body is located in the window, and the mounting parts are pressed against the outer side of the pusher head side wall through an elastic pressing sheet.

[0010] In some embodiments, a limiting structure is provided at the open portion of the pusher head, and a limiting structure is provided on the core shaft; the limiting structure of the pusher head cooperates with the limiting structure of the core shaft to confine the core shaft within the cavity.

[0011] In some embodiments, the limiting structure of the pusher head includes a plurality of convex portions and a plurality of concave portions uniformly and alternately distributed around the central axis; the limiting structure of the core shaft includes a plurality of convex portions and a plurality of concave portions uniformly and alternately distributed around the central axis.

[0012] In some embodiments, the end surface of the pusher head that contacts the object to be limited is any one of a plane, an arc surface, a spherical surface, and a tooth surface.

[0013] In some embodiments, the locking device further includes a limiting assembly for limiting the range of motion of the push head.

[0014] In some embodiments, the limiting assembly includes a limiting step arranged on the outer side of the pusher head side wall, and the limiting step is used to cooperate with a limiting pin to limit the movable range of the pusher head.

[0015] In some embodiments, the self-locking assembly further comprises an end piece, on which a through hole is provided; the end piece is fixedly connected to the spindle; and the through hole of the end piece is used for cooperating and mounting with an output piece of a driving device.

[0016] In some embodiments, the self-locking assembly further includes a boosting assembly, and the boosting assembly is used to keep the core shaft and the pusher head in an initial relative position before the pusher head contacts the object to be limited.

[0017] In some embodiments, a supporting groove is provided at one end of the core shaft close to the end piece; the self-locking assembly also includes a booster spring, and the end piece is fixedly connected to the core shaft to limit the booster spring in the supporting groove; the outer diameter of the booster spring matches the inner diameter of the cavity opening of the push head, so as to keep the core shaft and the push head in an initial relative position before the push head contacts the limited object.

[0018] In some embodiments, the booster spring is a V-shaped spring with a V-shaped cross-section; the V-shaped spring has a plurality of evenly distributed slits, and elastic claws are provided between adjacent slits, and the elastic claws abut against the protrusions of the push head cavity opening.

[0019] In some embodiments, the surface of the retaining ring that contacts the gripper shoe includes a structure for increasing friction.

[0020] In the second aspect, an embodiment of the present disclosure provides a limit actuator, comprising a driving device, an output component, and the locking device described in the first aspect of the embodiment of the present disclosure; the output component is coupled to the driving device and the locking device, respectively; the driving device drives the output component to move axially, driving the push head of the locking device to contact the limited object, and the self-locking component of the locking device locks the push head.

[0021] In some embodiments, the driving device includes a combination of one or more of an electric driving assembly, a pneumatic driving assembly, a hydraulic driving assembly, and a manual driving assembly.

[0022] The locking device provided by the embodiment of the present disclosure is composed of a push head and a self-locking component. When driven by an external force, the self-locking component drives the push head to move axially and contact the object to be limited, and then the self-locking component further moves axially relative to the push head to lock the push head. The self-locking component specifically includes a core shaft, a support shoe, and a retaining ring. During the locking process, after the push head contacts the object to be limited (i.e., reaches a 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 self-locking component to lock the push head does not directly act on the object to be limited, thereby reducing damage to the object to be limited; the core shaft, the support shoe, and the retaining ring can achieve self-locking, and the locking reliability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1a to Figure 1f is a view of a locking device according to an embodiment of the present disclosure, wherein Figure 1a and Figure 1b is a cross-sectional view along the longitudinal axis, Figure 1c is a cross-sectional view along the cutting line F2-F2, Figure 1d is a cross-sectional view along the cutting line F1-F1, Figure 1e This is an enlarged view of area F2-1. Figure 1f is an enlarged view of area F1-1;

[0024] Figure 2a to Figure 2e is a view of a locking device according to an embodiment of the present disclosure, illustrating the working principle of the locking device, wherein Figure 2a Shows the starting position, Figure 2b It shows that the locking device reaches the predetermined position. Figure 2c Indicates the position where the locking device reaches the maximum locking force. Figure 2d is with Figure 2a Another corresponding cross-sectional view, Figure 2e is with Figure 2c another corresponding cross-sectional view;

[0025] Figure 3a to Figure 3f is a view of a push head 201 according to an embodiment of the present disclosure, wherein Figure 3a is a cross-sectional view along the cutting line GG, Figure 3b is a cross-sectional view along the cutting line QQ, Figure 3c is a cross-sectional view along the longitudinal axis, Figure 3d is a cross-sectional view along the cutting line JJ, Figure 3e is a cross-sectional view along the cutting line HH, Figure 3f It is a stereogram;

[0026] Figure 4a to Figure 4c is a view of a push head 201 according to an embodiment of the present disclosure, wherein Figure 4a is a front view, Figure 4b is a cross-sectional view along the cutting line XX, Figure 4c It is the left view;

[0027] Figure 5a to Figure 5d is a view of a mandrel 202 according to an embodiment of the present disclosure, wherein Figure 5a is a front cross-sectional view, Figure 5b It is a top view. Figure 5c is the left view, Figure 5d It is a stereogram;

[0028] Figure 6a to Figure 6d is a view of four gripper shoes 203 according to an embodiment of the present disclosure, wherein Figure 6a is a cross-sectional view along the cutting line XX, Figure 6b is a front view, Figure 6c is the left view, Figure 6d It is a stereogram;

[0029] Figure 7a to Figure 7d is a view of a retaining ring 206 according to an embodiment of the present disclosure, wherein Figure 7a is a front view, Figure 7b is a cross-sectional view along the cutting line XX, Figure 7c is the left view, Figure 7d It is a stereogram;

[0030] Figure 8a to Figure 8c is a view of the limit pin 209 according to an embodiment of the present disclosure, wherein Figure 8a is a front view, Figure 8b is the left view, Figure 8c It is a stereogram;

[0031] Figure 9a to Figure 9c is a view of a V-shaped spring 208 according to an embodiment of the present disclosure, wherein Figure 9a It is a cross-sectional view along the cutting line AA. Figure 9b is a front view, Fig.9c is an enlarged view of area A;

[0032] Figure 10a to Figure 10d is a view of an end piece 207 according to an embodiment of the present disclosure, wherein Fig.10ais a front cross-sectional view, Fig.10b It is a top view. Fig.10c is the left view, Fig.10d It is a stereogram;

[0033] Fig.11 It is a structural schematic diagram of a dual-mode limit actuator according to an embodiment of the present disclosure;

[0034] Fig.12 It is a schematic diagram of the structure of another dual-mode limit actuator according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the technical solution of the present disclosure is described in detail below with reference to the accompanying drawings.

[0036] 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 disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0037] In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other.

[0038] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a", "an" and "the" are also intended to include the 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.

[0040] The embodiments described herein may be described with reference to plan views and / or cross-sectional views by means of idealized schematic diagrams of the present disclosure. 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 accompanying drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the accompanying drawings have schematic properties, and the shapes of the regions shown in the figures illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.

[0041] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as 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 art and the present disclosure, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined as such herein.

[0042] In the following description, some directional words, such as "upper", "lower", "left", "right", "far side", "proximal side", etc., will be used. This is only for convenience and does not limit the scope of protection of the present disclosure.

[0043] Example 1

[0044] An embodiment of the present disclosure provides a locking device.

[0045] Figure 1a It is a schematic diagram of a locking device in an embodiment of the present disclosure. The locking device can be used in water or underwater. In the embodiment of the present disclosure, the locking device mainly includes a push head 201 and a self-locking assembly, and the self-locking assembly includes a core shaft 202, a support shoe 203, a retaining ring 206, and an end piece 207. In the locking device, the support shoe 203 is squeezed by the core shaft 202, and the support shoe 203 is squeezed and moves radially. The support shoe 203 is deformed under the constraint of the retaining ring 206 and contacts the retaining ring 206, generating a locking force, locking the push head 201 in a predetermined position, so that the push head 201 can withstand the reaction force of the object to be limited, thereby achieving the purpose of limiting the object to be limited. The push head 201 is a component that generates a force on the object to be limited.

[0046] Figures 1a to 1f is a schematic diagram of a locking device in an embodiment of the present disclosure, wherein: Figure 1a and Figure 1b is a cross-sectional view along the longitudinal axis, Figure 1c is a cross-sectional view along the cutting line F2-F2, Figure 1d is a cross-sectional view along the cutting line F1-F1, Figure 1e This is an enlarged view of area F2-1. Figure 1f This is an enlarged view of area F1-1.

[0047] In some embodiments, a through hole is provided on the end piece 207, and the end piece 207 is fixedly connected to the spindle 202. When the locking device is applied to a limit actuator, the through hole is installed in cooperation with an output component (e.g., a driving bolt 1000) of the limit actuator, thereby coupling the locking device to the driving device of the limit actuator.

[0048] The push head 201 is a cylindrical shape with one end closed and the other end open, the closed end is located at the proximal end, against the object to be restricted and exerts force on the object. The mandrel 202 is located inside the push head 201, and the outer peripheral surface is conical, and its outer diameter decreases toward the closed end (i.e., the proximal end) of the push head 201.

[0049] In some embodiments, the taper range of the conical outer circumference of the mandrel 202 is 0 to 10 degrees. For example, the taper range of the conical outer circumference of the mandrel 202 is 0.1 to 8 degrees. For example, the taper of the conical outer circumference of the mandrel 202 can be set to 2 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, etc. In the embodiment of the present disclosure, the above taper range can be called a self-locking angle range. The outer circumference of the mandrel 202 adopts a conical design that meets the above taper range, which can make the mandrel 202, the support shoe 203, and the retaining ring 206 cooperate to achieve self-locking.

[0050] During installation, the driving bolt 1000 is first passed through the through hole of the end piece 207, and then the end piece 207 is fixedly connected to the mandrel 202. A limiting structure is provided at the open end of the push head 201 (see Figure 5a to Figure 5d ), the mandrel 202 also has a matching limiting structure ( Figure 7a to Figure 7d ), after the limiting structures of the two are aligned, the mandrel 202 can be installed in the cylindrical cavity of the push head 201, and then the mandrel 202 can be rotated after passing through the limiting structure to limit the mandrel 202 in the push head 201. A step is provided on the inner wall of the push head 201, and the step cooperates with the limiting structure on the mandrel 202 to limit the maximum distance that the mandrel 202 can move to the right relative to the push head 201. The limiting structure at the open end of the push head 201 cooperates with the limiting structure on the mandrel 202 to limit the maximum distance that the mandrel 202 can move to the left relative to the push head 201.

[0051] A V-shaped spring 208 is arranged between the mandrel 202 and the end piece 207. The outer diameter of the V-shaped spring 208 matches the inner diameter of the limiting structure at the opening of the push head 201. A certain initial thrust is required to deform the V-shaped spring 208, thereby pushing the mandrel 202 further into the push head 201. Before the push head 201 contacts the object to be limited, the force acting on the V-shaped spring 208 is less than the initial thrust, and the V-shaped spring 208 will not be deformed or will be slightly deformed, and cannot enter the opening of the push head 201, so that the driving bolt 1000 can both push the push head 201 to move to the right and prevent the mandrel 202 from being locked, thereby preventing the push head 201 from being locked before reaching the target position. When the push head 201 contacts the object to be limited, the force acting on the V-shaped spring 208 becomes greater than the initial thrust, the V-shaped spring 208 is squeezed and deformed, and the mandrel 202 continues to move to the right relative to the push head 201 until it is locked.

[0052] The side wall of the push head 201 is provided with a plurality of windows 2011 penetrating the side wall, and the support shoe 203 is installed in the window 2011. The support shoe 203 includes a main body 2031 and two mounting parts 2032 (see Figure 8a to Figure 8c ), during installation, the main body 2031 and the window 2011 are placed in the window 2011 accordingly. On the side wall of the push head 201, the two mounting parts 2032 of the support shoe 203 are pressed by the elastic pressing sheet 212, and then the support shoe 203 is fixed to the push head 201 by the screw 211.

[0053] The inner wall of the shoe 203 is a variable diameter structure, and the closer to the locking direction, the smaller the radius of the opening of the variable diameter part, that is, the inner diameter of the shoe 203 decreases toward the closed end (i.e., the proximal end) of the push head 201, so as to cooperate with the conical structure of the mandrel 202 to achieve a gradual locking effect. In some embodiments, the opening radius of the variable diameter part of the inner circumferential surface of the shoe 203 decreases nonlinearly in the direction close to the end face of the push head 201, and the reduction amplitude gradually increases. As the mandrel 202 moves close to the end face of the push head 201, it squeezes the shoe 203, so that the radial pressure generated by the shoe 203 under the constraint of the retaining ring 206 gradually increases, thereby generating a gradually increasing locking force. The taper of the mandrel 202 and the shoe 203 meets the self-locking angle range. When the mandrel 202 squeezes the shoe 203, the shoe 203 moves radially under the squeezing, and the outer diameter of the shoe 203 is deformed under the constraint of the retaining ring 206, thereby generating a locking force and achieving self-locking.

[0054] In some embodiments, the surface of the retaining ring 206 in contact with the support shoe 203 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 of the retaining ring 206 in contact with the support shoe 203, which can increase the friction between the retaining ring 206 and the contact surface of the support shoe. In some embodiments, the structure that increases friction is a structure obtained by surface treatment of the surface of the retaining ring 206 in contact with the support shoe 203, for example, the surface of the retaining ring 206 in contact with the support shoe 203 is a concave-convex structure, which can also increase the friction between the retaining ring 206 and the contact surface of the support shoe, thereby increasing the locking force.

[0055] The support shoe 203 abuts against the retaining ring 206 in the radial direction. The retaining ring 206 can be fixed on the inner wall of the cylinder 210 of the limit actuator by means of threads, screws, interference fit, etc., and can also be made into a structure integrated with the inner wall of the cylinder 210.

[0056] The limit pin 209 is inserted into the hole located on the side wall of the cylinder body 210 and abuts against the outer wall of the push head 201. When unlocking, the push head 201 moves axially with the core shaft 202 away from the object to be limited; when the limit step set on the outer wall of the push head 201 contacts the limit pin 209, the push head 201 stops moving axially, and when the core shaft 202 continues to move axially away from the object to be limited, the push head 201 remains stationary, so that the core shaft 202 is separated from the push head 201 and unlocked, and it can also ensure that the push head 201 will not enter the cylinder body and lock without contacting the object to be limited during the next locking process. In some embodiments, when the limit pin 209 contacts the limit step on the outer wall of the push head 201, the end face of the push head 201 used to contact the object to be limited is flush with one end of the limit actuator.

[0057] Figure 2a to Figure 2e is a view of a locking device according to an embodiment of the present disclosure, illustrating the working principle and various positions of the locking device, wherein Figure 2a Shows the starting position, Figure 2b It shows that the locking device reaches the predetermined position. Figure 2c Indicates the position where the locking device reaches the maximum locking force. Figure 2d is with Figure 2a Another corresponding cross-sectional view, Figure 2e is with Figure 2c Another corresponding cross-sectional view.

[0058] exist Figure 2a In the starting position shown, the push head 201 has not yet contacted the object 3. The driving bolt 1000 moves axially to the right. Before the push head 201 contacts the object 3, the force acting on the V-shaped spring 208 is less than the preset initial thrust. The V-shaped spring 208 does not deform or deforms slightly and cannot enter the opening of the push head 201, so that the driving bolt 1000 pushes the push head 201, the spindle 202, and the support shoe 203 to move to the right as a whole. During this process, the spindle 202 will not be locked, preventing the push head 201 from being locked before reaching the target position. This process continues until Figure 2b In the position shown, the push head 201 contacts the restricted object 3.

[0059] When the push head 201 contacts the restricted object 3, the push head 201 stops moving, and the force acting on the V-shaped spring 208 becomes greater than the preset initial thrust. The V-shaped spring 208 is squeezed and deformed, and the core shaft 202 continues to move to the right relative to the push head 201, squeezing the support shoe 203. The support shoe 203 is squeezed and moves radially. The support shoe 203 is deformed under the constraint of the retaining ring 206 and contacts the retaining ring 206, generating a locking force to lock the push head 201 in a predetermined position. Figure 2c Position shown.

[0060] Figure 3a to Figure 3f FIG. 2 is a view of a push head 201 according to an embodiment of the present disclosure. Figure 3a is a cross-sectional view along the cutting line GG, Figure 3b is a cross-sectional view along the cutting line QQ, Figure 3c is a cross-sectional view along the longitudinal axis, Figure 3d is a cross-sectional view along the cutting line JJ, Figure 3e is a cross-sectional view along the cutting line HH, Figure 3f It is a stereogram.

[0061] Figure 4a to Figure 4c is a view of a push head 201 according to an embodiment of the present disclosure, wherein Figure 4a is a front view, Figure 4b is a cross-sectional view along the cutting line XX, Figure 4c It is the left view.

[0062] The push head 201 is generally in the shape of a bottomed cylinder with one end open, and includes a barrel portion 2013, a barrel bottom portion 2017, and a connecting portion 2012 located therebetween. The outer diameter of the connecting portion 2012 is smaller than the outer diameters of the barrel portion 2013 and the barrel bottom portion 2017. In the connecting portion 2012, a plurality of windows 2011 are formed around the central axis, and the number of openings is four in the illustrated embodiment, but the number is not limited. Since four windows 2011 are provided, the connecting portion 2012 includes four gripper shoe support portions 2019. When the gripper shoe 203 is placed in the window 2011, the two mounting portions 2032 of the gripper shoe 203 abut against the edge of the gripper shoe support portion 2019. A plurality of threaded holes 2014 are formed in each gripper shoe support portion 2019, and the number of threaded holes is two in the illustrated embodiment, but the number is not limited. When the gripper shoe 203 is placed in the window 2011 , the two mounting portions 2032 of the gripper shoe 203 are pressed by the elastic pressing sheet 212 , so that the gripper shoe 203 is fixed to the pusher head 201 by the screws 211 .

[0063] A limiting structure is formed on the inner circumference of the open end of the barrel 2013, and the limiting structure includes a plurality of protrusions 2016 and a plurality of recesses 2018 uniformly and alternately distributed around the central axis. In the illustrated embodiment, the number of protrusions 2016 and recesses 2018 is four, but the number is not limited.

[0064] A countersunk threaded hole 2015 penetrating the side wall of the barrel 2013 is provided in each recess 2018. The screw 213 is screwed into the countersunk threaded hole 2015 to prevent the spindle 202 from rotating around the axis relative to the push head 210.

[0065] The embodiment of the present disclosure does not specifically limit the shape of the end surface of the push head 201 that is used to contact the object to be limited. For example, the end surface of the push head 201 that is used to contact the object to be limited is in the shape of a plane, an arc surface, a spherical surface, a tooth surface, etc. In the embodiment of the present disclosure, when the end surface of the push head 201 that is used to contact the object to be limited is a plane, the specific shape can be a flat circle, a rectangle, a triangle, etc.; when the end surface of the push head 201 that is used to contact the object to be limited is an arc surface, the arc surface can be curved outward (away from the direction of the core axis) or inward (toward the direction of the core axis); when the end surface of the push head 201 that is used to contact the object to be limited is a spherical surface, the spherical surface can be convex outward (away from the direction of the core axis) or concave inward (toward the direction of the core axis). In the embodiment of the present disclosure, the tooth surface refers to a structure with multiple teeth on the surface, for example, the surface has a sharp tooth structure arranged in an array.

[0066] Figure 5a to Figure 5d is a view of a mandrel 202 according to an embodiment of the present disclosure, wherein Figure 5a is a front cross-sectional view, Figure 5b It is a top view. Figure 5c is the left view, Figure 5d It is a stereogram.

[0067] The mandrel 202 is generally cylindrical, and mainly includes a conical portion 2021, a stopper portion 2026, a cylindrical portion 2022 and a threaded portion 2023. The conical portion 2021 has a conical outer peripheral surface with an outer diameter decreasing toward the closed end (i.e., the proximal end) of the push head 201, and the outer peripheral surface abuts against the support shoe 203 and forms a self-locking.

[0068] The limiting portion 2026 includes a plurality of protrusions 2024 and a plurality of recesses 2025 uniformly and alternately distributed around the central axis. In the illustrated embodiment, the number of the protrusions 2024 and the recesses 2025 are both four, but the number is not limited.

[0069] The sizes of the protrusion 2016 and recess 2018 of the push head 201 and the protrusion 2024 and recess 2025 of the core shaft 202 are set so that after the limiting structures of the two are aligned, the core shaft 202 can be installed in the cylindrical cavity of the push head 201, and then the core shaft 202 is rotated after passing through the limiting structure to confine the core shaft 202 in the push head 201.

[0070] The external thread of the threaded portion 2023 is engaged with the internal thread of the end piece 207. The outer diameter of the threaded portion 2023 is smaller than that of the cylindrical portion 2022, so that a step 2027 is formed therebetween, and the V-shaped spring 208 is disposed at the step 2027.

[0071] Figure 6a to Figure 6d is a view of four gripper shoes 203 according to an embodiment of the present disclosure, wherein Figure 6a is a cross-sectional view along the cutting line XX, Figure 6bIt is the front view along the axis direction. Figure 6c is the left view, Figure 6d It is a stereogram.

[0072] In the illustrated embodiment, there are four grippers 203, but the number is not limited. The grippers 203 mainly include an arc-shaped main body 2031 and two mounting portions 2032 located on both sides of the circumference. A notch portion 2033 is provided at the center of each mounting portion 2032.

[0073] The outer circumference of the shoe 203 is a cylindrical surface, which matches the inner circumference of the retaining ring, and the inner circumference is toward the proximal side ( Figure 8a The right side of the figure shows a conical surface with a reduced diameter, thereby cooperating with the conical portion 2021 of the core shaft 202.

[0074] Figure 7a to Figure 7d is a view of a retaining ring 206 according to an embodiment of the present disclosure, wherein Figure 7a is a front view, Figure 7b is a cross-sectional view along the cutting line XX, Figure 7c is the left view, Figure 7d It is a stereogram.

[0075] The retaining ring 206 is substantially cylindrical, and a countersunk threaded hole 2061 is provided on the side wall thereof.

[0076] Figure 8a to Figure 8c is a view of the limit pin 209 according to an embodiment of the present disclosure, wherein Figure 8a is a front view, Figure 8b is the left view, Figure 8c It is a stereogram.

[0077] The limiting pin 209 includes a head portion 2091 and a pin body portion 2092 , and the diameter of the head portion 2091 is greater than the diameter of the pin body portion 2092 .

[0078] Figure 9a to Figure 9c is a view of a V-shaped spring 208 according to an embodiment of the present disclosure, wherein Figure 9a It is a cross-sectional view along the cutting line AA. Figure 9b is a front view, Fig.9c This is an enlarged view of area A.

[0079] The V-shaped spring 208 is a disc-shaped spring with a V-shaped cross section. At the outer end of the V-shaped cross section, the V-shaped spring 208 has a plurality of evenly distributed slits 2081. The number of the slits 2081 is not limited. The size and number of the slits 2081 can be used to adjust the magnitude of the initial thrust. Between adjacent slits 2081 are elastic claws. Accordingly, the number of the elastic claws is not limited.

[0080] like Figure 2dAs shown in FIG. 1 , at the starting position, the elastic claw at the outer end of the V-shaped spring 208 abuts against the limiting structure at the opening of the push head 201, namely, the protrusion 2016. When the force acting on the V-shaped spring 208 becomes greater than the preset initial thrust, the V-shaped spring 208 is squeezed and deformed, and the core shaft 202 can continue to move rightward relative to the push head 201. Figure 2e shown.

[0081] Figure 10a to Figure 10d is a view of an end piece 207 according to an embodiment of the present disclosure, wherein Fig.10a is a front cross-sectional view, Fig.10b It is a top view. Fig.10c is the left view, Fig.10d It is a stereogram.

[0082] The end piece 207 is roughly cylindrical and mainly includes an end piece body 2071 and a protrusion 2072. The outer circumference of the end piece body 2071 matches the inner circumference of the cylinder body 210, and a groove 2073 for mounting the sealing ring 1200 is provided on the outer circumference of the end piece body 2071. The inner circumference of the end piece body 2071 matches the outer circumference of the driving bolt 1000, and a groove 2074 for mounting the sealing ring 1210 is provided on the inner circumference of the end piece body 2071. A step is formed on the inner circumference of the end piece body 2071. A plurality of screw holes 2075 are formed on the end surface of the end piece body 2071.

[0083] In some embodiments, when the locking device is installed in the cylinder body 210, a sealing ring 1140 may be provided between the cylinder body 210 and the locking device.

[0084] An internal thread for matching with the external thread of the threaded portion 2023 of the core shaft 202 is provided on the inner circumferential surface of the protrusion 2072 .

[0085] Example 2

[0086] An embodiment of the present disclosure provides a limit actuator, including a driving device, an output component, and the locking device described in the first aspect of the embodiment of the present disclosure; the output component is coupled to the driving device and the locking device respectively; the driving device drives the output component to move axially, driving the push head of the locking device to contact the limited object, and the self-locking component of the locking device locks the push head.

[0087] In some embodiments, the driving device includes a combination of one or more of an electric driving assembly, a pneumatic driving assembly, a hydraulic driving assembly, and a manual driving assembly.

[0088] Example 3

[0089] The embodiment of the present disclosure provides a dual-mode limit actuator including the locking device in the embodiment of the present disclosure, which supports manual + automatic dual modes. Fig.11 A schematic diagram of the structure of a dual-mode limit actuator provided in an embodiment of the present disclosure, Fig.12 A schematic structural diagram of another dual-mode limit actuator provided in an embodiment of the present disclosure.

[0090] like Fig.11 and Fig.12 As shown, the dual-mode limit actuator is mainly composed of a cylinder assembly 10, a driving bolt 1000, and a locking device 20.

[0091] The dual-mode limit actuator includes a cylinder body 100, an inner sleeve 150, etc.; the cylinder assembly 10 mainly includes a medium chamber formed by the cylinder body 100 and the inner sleeve 150, a piston 111, an end cover 112, and an axial sleeve 900; holes a and b for external oil pressure sources are provided on the side wall of the cylinder body 100, and the movement of the piston 111 is controlled by the holes a and b.

[0092] The inner sleeve 150 is fixedly connected to the cylinder body 100 by bolts, providing a closed installation space for moving parts such as the piston 111. The piston 111 moves axially in the medium chamber. The piston 111 is fixedly connected to the axial sleeve 900. The end cover 112 realizes the sealing of the medium chamber and the limiting of the piston.

[0093] In some embodiments, Fig.11 As shown, the piston 111 includes a tubular portion and a flange portion arranged at one end of the tubular portion of the piston 111 away from the end cover 112; the tubular portion of the piston 111 is sleeved on the inner sleeve 150, the flange portion of the piston 111 forms a close contact with the inner wall of the cylinder body 100, and the inner wall of the tubular portion of the piston 111 forms a close contact with the outer wall of the inner sleeve 150; that is, the cross section of the piston 111 is "L" shaped. The end cover 112 is installed between the outer wall of the tubular portion of the piston 111 and the inner wall of the cylinder body 100; the end of the tubular portion of the piston 111 close to the end cover 112 is fixedly connected to the flange portion of the axial sleeve 900.

[0094] In some embodiments, Fig.12 As shown, the piston 111 includes a tubular portion, an outer flange portion and an inner flange portion arranged at one end of the tubular portion of the piston 111 away from the end cover; the tubular portion of the piston 111 is sleeved on the inner sleeve 150, the outer flange portion of the piston 111 forms a close contact with the inner wall of the cylinder body 100, and the inner flange portion of the piston 111 forms a close contact with the outer wall of the inner sleeve 150; that is, the cross section of the piston 111 is "T" shaped. The end cover includes a first end cover 116 and a second end cover 117, the first end cover 116 is installed between the outer wall of the tubular portion of the piston 111 and the inner wall of the cylinder body 100; the second end cover 117 is installed between the inner wall of the tubular portion of the piston 111 and the outer wall of the inner sleeve 150; the end of the tubular portion of the piston 111 close to the end cover is fixedly connected to the flange portion of the axial sleeve 900.

[0095] Linear gear teeth (i.e., splines) are provided on the inner surface of the inner sleeve 150 and the outer surface of the axial sleeve 900, respectively. The inner sleeve 150 and the axial sleeve 900 are meshed with each other through the gear teeth. The outer peripheral gear teeth of the axial sleeve 900 match the inner peripheral gear teeth of the inner sleeve 150. The axial sleeve 900 and the inner sleeve 150 do not rotate relative to each other; however, the axial sleeve 900 can move axially relative to the inner sleeve 150. The internal thread of the axial sleeve 900 meshes with the external thread of the driving bolt 1000.

[0096] When the ports a and b of the cylinder 100 are connected to oil pressure, the piston 111 will move axially along the outer cylindrical surface of the inner sleeve 150, realizing the axial movement of the axial sleeve 900. Since the axial sleeve 900 and the driving bolt 1000 are threadedly engaged, the axial movement of the driving bolt 1000 is realized. The axially moving driving bolt 1000 then acts on the locking device to realize the locking or unlocking of the locking device. This working mode is the automatic mode.

[0097] The outer end of the driving bolt 1000 is designed as an outer hexagonal head, which is convenient for a torque tool such as a hydraulic torque wrench to clamp the outer end. In the manual mode, the torque wrench is rotated around the axis, so that the rotational motion of the torque wrench is converted into the axial movement of the driving bolt 1000, and the axially moving driving bolt 1000 then acts on the locking device to achieve locking or unlocking of the locking device. This working mode is the manual mode.

[0098] The locking process in manual mode is described below.

[0099] In the starting position, the locking device 20 is in a retracted state.

[0100] The step of extending the push head 201 without load is as follows: the driving bolt 1000 is rotated to make the driving bolt 1000 move axially, pushing the locking device to extend as a whole, and the push head 201 contacts the restricted object, that is, reaches the predetermined position.

[0101] Locking steps: the push head 201 stops moving after contacting the object to be limited, and the driving bolt 1000 continues to push the core shaft 202 to move axially; during the axial movement of the core shaft 202, the support shoe 203 is squeezed and moves radially, and the support shoe 203 is deformed under the constraint of the retaining ring 206 and contacts the retaining ring 206, generating a locking force, locking the push head 201 in a predetermined position, thereby achieving the purpose of limiting the object to be limited.

[0102] In one embodiment, the maximum locking force of the locking device 20 is about 1800 KN, that is, the push head 201 can withstand a maximum reaction force of 1800 KN of the object to be restrained. However, the locking force can be selected to have different values ​​according to specific applications.

[0103] The locking process in automatic mode is described below.

[0104] In the starting position, the locking device 20 is in a retracted state.

[0105] The steps of extending the push head 201 without load are as follows: the oil cylinder assembly 10 is connected to the oil pressure to push the piston 111 and the driving bolt 1000 to move axially, and the locking device 20 is pushed out as a whole, and the push head 201 contacts the object to be limited, that is, reaches the predetermined position.

[0106] Locking steps: the push head 201 stops moving after contacting the object to be limited, and the piston 111 continues to push the core shaft 202 to move axially by driving the bolt 1000; during the axial movement of the core shaft 202, the support shoe 203 is squeezed and moves radially, and the support shoe 203 is deformed under the constraint of the retaining ring 206 and contacts the retaining ring 206, generating a locking force, locking the push head 201 in a predetermined position, thereby achieving the purpose of limiting the object to be limited.

[0107] In one embodiment, the thrust force of the piston 111 pushing the core shaft 202 is about 1200 KN, but the thrust force can be selected to be different according to specific applications.

[0108] In one embodiment, the maximum locking force of the locking device 20 is about 1800 KN, that is, the push head 201 can withstand a maximum reaction force of 1800 KN of the object to be restrained. However, the locking force can be selected to have different values ​​according to specific applications.

[0109] 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 noted, 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 disclosure as set forth in the appended claims.

Claims

1. A locking device, characterized in that: include: A push head, used for contacting with the object to be limited; A self-locking component, used for driving the push head to move axially and locking the push head after the push head contacts the object to be limited; The self-locking assembly comprises a core shaft (202), a support shoe (203), and a retaining ring (206); the core shaft (202) presses the support shoe (203) in the radial direction so that the support shoe (203) contacts the retaining ring (206) to generate a locking force.

2. The locking device according to claim 1, characterized in that: The push head (201) comprises a side wall and an end face for contacting a restricted object, wherein the end face and the side wall enclose a cavity; the core shaft (202) is arranged in the cavity, and the outer peripheral surface of the core shaft (202) is conical; The side wall of the push head (201) is provided with a plurality of windows penetrating the side wall, the support shoe (203) is installed in the window, and a reducing portion is provided on the inner circumference of the support shoe (203), and the opening radius of the reducing portion gradually decreases in the direction approaching the end face.

3. The locking device according to claim 2, characterized in that: The conical outer peripheral surface of the core shaft (202) has a taper range of 0 degrees to 10 degrees.

4. The locking device according to claim 2, characterized in that: The support shoe comprises a main body and mounting parts respectively located on both sides of the main body, the main body is located in the window, and the mounting parts are pressed against the outer side of the pusher head side wall through an elastic pressing sheet.

5. The locking device according to claim 2, characterized in that: A limiting structure is provided at the open portion of the pusher head (201), and a limiting structure is provided on the core shaft (202); the limiting structure of the pusher head (201) cooperates with the limiting structure of the core shaft (202) to limit the core shaft (202) within the cavity.

6. The locking device according to claim 5, characterized in that: The limiting structure of the pusher head includes a plurality of convex parts and a plurality of concave parts uniformly and alternately distributed around the central axis; the limiting structure of the mandrel includes a plurality of convex parts and a plurality of concave parts uniformly and alternately distributed around the central axis.

7. The locking device according to any one of claims 1 to 6, characterized in that: The end surface of the push head (201) used for contacting the object to be limited is any one of a plane surface, a curved surface, a spherical surface, and a tooth surface.

8. The locking device according to any one of claims 1 to 6, characterized in that: The locking device also includes a limiting component for limiting the range of movement of the push head.

9. The locking device according to claim 8, characterized in that: The limiting assembly includes a limiting step arranged on the outer side of the push head side wall, and the limiting step is used to cooperate with the limiting pin to limit the movable range of the push head.

10. The locking device according to any one of claims 1 to 6, characterized in that: The self-locking assembly further comprises an end piece (207), and a through hole is provided on the end piece (207); The end piece (207) is fixedly connected to the core shaft (202); the through hole of the end piece (207) is used for matching and installing with the output piece of the driving device.

11. The locking device according to claim 10, characterized in that: The self-locking assembly further comprises a boosting assembly, which is used to keep the core shaft and the pusher head in an initial relative position before the pusher head contacts the object to be limited.

12. The locking device according to claim 11, characterized in that: A support groove is provided at one end of the mandrel close to the end piece; The self-locking assembly further comprises a boosting spring (208), the end piece being fixedly connected to the core shaft to limit the boosting spring in the supporting groove; The outer diameter of the booster spring matches the inner diameter of the cavity opening of the pusher head, and is used to keep the core shaft and the pusher head in an initial relative position before the pusher head contacts the restricted object.

13. The locking device according to claim 12, characterized in that: The booster spring is a V-shaped spring with a V-shaped cross section; the V-shaped spring has a plurality of evenly distributed slits, and elastic claws are arranged between adjacent slits, and the elastic claws abut against the protrusions of the push head cavity opening.

14. The locking device according to any one of claims 1 to 6, characterized in that: The surface of the retaining ring in contact with the gripper shoe includes a structure for increasing friction.

15. A limit actuator, characterized in that: It includes a driving device, an output component, and a locking device according to any one of claims 1 to 14; the output component is coupled to the driving device and the locking device respectively; the driving device drives the output component to move axially, driving the push head of the locking device to contact the limited object, and the self-locking component of the locking device locks the push head.

16. The limit actuator according to claim 15, characterized in that: The driving device includes one or more of an electric driving component, a pneumatic driving component, a hydraulic driving component, and a manual driving component.

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