Self-locking device for an electric actuator

Abstract

The utility model relates to electric actuator technical field, and disclose a kind of self-locking device of electric actuator, including actuator body and self-locking component, the self-locking component sleeve is set in the output end of actuator body, and the output end of actuator body is actuator connecting rod, and the surface welding of actuator connecting rod is fixed with connecting column;Self-locking component is used to lock actuator connecting rod when actuator connecting rod telescopes to specified position, and the linkage of connecting column and arc around sliding slot is set, so that the movement of actuator connecting rod directly triggers self-locking action, without additional power source;The abutment in multiple straight sliding slots is synchronous and close along radial, and the friction of rubber block with actuator connecting rod is increased, to ensure that self-locking force is evenly distributed, avoid the problem that traditional single point locking is easy to loosen, can stably bear reverse load, guarantee the position precision of valve, gate and other controlled components, reduce equipment operation deviation, solve the problem of electric actuator automatic self-locking.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, specifically to a self-locking device for an electric actuator. Background Technology

[0002] In fields such as industrial automation, water supply and drainage systems, and HVAC, electric actuators are core devices for controlling the opening and closing of components such as valves and gates, and their operational stability directly affects the safety and efficiency of the entire system.

[0003] After driving the controlled component to the designated position, the electric actuator needs to maintain the load state through a self-locking device to prevent the component from shifting due to reverse loads such as gravity. Therefore, the self-locking device has become an indispensable part of the electric actuator. Especially under complex working conditions such as high temperature, high pressure, and vibration, reliable self-locking performance is the key to ensuring continuous production and equipment safety.

[0004] Currently available electric actuator self-locking devices are prone to locking failure due to factors such as component wear and vibration, which can lead to displacement of the controlled component. Moreover, they often rely on additional motors or electromagnetic mechanisms, which not only increases equipment energy consumption and manufacturing costs but also poses a risk of malfunction due to electromagnetic interference. In addition, most of these devices are integrated designs, making it difficult to disassemble the self-locking components and the actuator body. Maintenance requires a complete shutdown and disassembly, which prolongs downtime.

[0005] Therefore, a self-locking device for electric actuators is proposed to solve the problem of automatic self-locking of electric actuators. Summary of the Invention

[0006] The purpose of this invention is to provide a self-locking device for an electric actuator to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a self-locking device for an electric actuator, comprising an actuator body and a self-locking component, wherein the self-locking component is sleeved on the output end of the actuator body, the output end of the actuator body is an actuator connecting rod, and a connecting post is welded and fixed to the surface of the actuator connecting rod; the self-locking component is used to lock the actuator connecting rod when it extends or retracts to a specified position.

[0008] The self-locking assembly includes a protective cover that protects the internal mechanism and the actuator connecting rod. A fixed plate through which the actuator connecting rod passes is welded to the bottom of the protective cover. The fixed plate has several straight sliding grooves arranged at a fixed angle around the actuator connecting rod. A stop block is slidably installed inside the straight sliding groove. A limit post is welded to the end of the stop block away from the actuator connecting rod. The stop block slides towards the actuator connecting rod in the straight sliding groove and finally abuts against the surface of the actuator connecting rod to form a locking mechanism.

[0009] A rotating block is rotatably mounted on the top of the fixed plate and sleeved on the outside of the actuator connecting rod. The surface of the rotating block has the same number of arc-shaped grooves as the straight grooves. The limiting post is slidably installed inside the arc-shaped groove. When the rotating block rotates, the limiting post slides inside the arc-shaped groove, thereby driving the abutment block to slide towards the actuator connecting rod in the straight groove.

[0010] A connecting cover is welded and fixed to the top of the rotating block, and a rotating cylinder that fits onto the surface of the actuator connecting rod is welded and fixed to the top of the connecting cover. An arc-shaped circumferential groove is opened on the surface of the rotating cylinder, and the connecting column is slidably installed inside the arc-shaped circumferential groove.

[0011] When the actuator connecting rod extends, the connecting column slides along the arc-shaped groove, which in turn drives the connecting cover to rotate, causing the rotating block to rotate, which in turn drives the abutment block to slide towards the actuator connecting rod in the straight groove, thus fixing the actuator connecting rod.

[0012] Preferably, a fixing seat fitted onto the outer wall of the actuator connecting rod is welded and fixed to the bottom of the actuator body, and a top cover fitted onto the outer wall of the actuator connecting rod is welded and fixed to the top of the protective cover. A locking block that mates with the fixing seat is welded and fixed to the top of the top cover for connecting the fixing seat. The locking block of the top cover mates with the fixing seat to achieve quick positioning and connection between the self-locking component and the actuator body, simplifying the installation process.

[0013] Preferably, a bottom cover is welded and fixed to the bottom of the fixed plate, and the bottom cover is fixed to the inner wall of the protective cover.

[0014] The bottom cover is fixed to the inner wall of the fixed plate and the protective cover, forming a closed bottom protection structure to prevent dust and oil from entering the self-locking component and affecting the transmission; the bottom cover supports the fixed plate, enhances the load-bearing capacity of the fixed plate, and prevents the fixed plate from deforming when the actuator connecting rod is under force.

[0015] Preferably, the side wall of the fixed plate has several mounting holes two, and the surface of the protective cover has several mounting holes one that mate with the mounting holes two. Mounting screws are installed in the internal threads of the mounting holes one and two. The fixed plate and the protective cover are fixed together by the mounting screws.

[0016] Preferably, the abutment block has several rubber blocks on the side facing the actuator connecting rod to increase friction. The rubber blocks are elastic and can adapt to minor unevenness on the surface of the actuator connecting rod, avoiding wear on components caused by rigid contact and extending the service life of the actuator connecting rod.

[0017] Preferably, a handwheel is provided on one side of the actuator body, and the handwheel is connected to the internal structure of the actuator body for driving in the event of electric failure.

[0018] Preferably, a locking mechanism is provided on the top of the actuator body to lock the interior of the actuator body and control the state of the actuator body.

[0019] Compared with the prior art, the present invention provides a self-locking device for an electric actuator, which has the following advantages: 1. The self-locking device of this electric actuator, through the linkage between the connecting column and the arc-shaped surrounding slide groove, allows the movement of the actuator connecting rod to directly trigger the self-locking action without the need for an additional power source; the abutments in multiple sets of straight slide grooves move together radially and synchronously, and the rubber blocks increase the friction with the actuator connecting rod, ensuring that the self-locking force is evenly distributed, avoiding the problem of easy loosening of traditional single-point locking, and can stably withstand reverse loads, ensuring the positional accuracy of controlled components such as valves and gates, and reducing equipment operation deviations.

[0020] 2. The self-locking device of the electric actuator is assembled by means of a locking block and a fixed seat, and a locking screw. It can be quickly disassembled and assembled from the actuator body, which is convenient for individual inspection or replacement. The handwheel and the locking mechanism form an emergency and auxiliary locking system. In case of electric failure, it can be operated manually without disassembling the device. The locking mechanism can lock the internal state of the actuator alone, reducing maintenance difficulty and downtime, and improving equipment operation and maintenance efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the appearance and structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a schematic diagram of the self-locking component structure of this utility model; Figure 4 This is a schematic diagram of the fixed disk and the connected mechanism of this utility model.

[0022] In the diagram: 1. Actuator body; 2. Handwheel; 3. Locking mechanism; 4. Actuator connecting rod; 401. Connecting column; 402. Fixing base; 5. Self-locking assembly; 501. Protective cover; 502. Mounting hole one; 503. Top cover; 504. Locking block; 505. Fixing plate; 506. Bottom cover; 507. Mounting hole two; 508. Straight slide groove; 509. Abutment block; 510. Limiting column; 511. Rubber block; 512. Rotating block; 513. Arc-shaped slide groove; 514. Connecting cover; 515. Rotating cylinder; 516. Arc-shaped surrounding slide groove; 517. Mounting screw. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Please see Figure 1-4 This utility model provides a technical solution: a self-locking device for an electric actuator, including an actuator body 1 and a self-locking component 5. The self-locking component 5 is sleeved on the output end of the actuator body 1. The output end of the actuator body 1 is an actuator connecting rod 4. A connecting post 401 is welded and fixed to the surface of the actuator connecting rod 4. The self-locking component 5 is used to lock the actuator connecting rod 4 when it is extended or retracted to a specified position.

[0026] Please see Figure 3-4 Furthermore, the self-locking assembly 5 includes a protective cover 501, which protects the internal mechanism and the actuator connecting rod 4. A fixed plate 505 through which the actuator connecting rod 4 passes is welded and fixed to the bottom of the protective cover 501. The fixed plate 505 has several straight sliding grooves 508 arranged at a fixed angle around the actuator connecting rod 4. A stop block 509 is slidably installed inside the straight sliding groove 508. A limit post 510 is welded and fixed to the end of the stop block 509 away from the actuator connecting rod 4. The stop block 509 slides towards the actuator connecting rod 4 in the straight sliding groove 508 and finally abuts against the surface of the actuator connecting rod 4 to form a locking mechanism.

[0027] A rotating block 512 is rotatably mounted on the top of the fixed plate 505 and sleeved on the outside of the actuator connecting rod 4. The surface of the rotating block 512 has an arc-shaped groove 513 with the same number as the straight groove 508. The limiting post 510 is slidably installed inside the arc-shaped groove 513. When the rotating block 512 rotates, the limiting post 510 slides inside the arc-shaped groove 513, thereby driving the abutment block 509 to slide towards the actuator connecting rod 4 in the straight groove 508.

[0028] A connecting cover 514 is welded and fixed to the top of the rotating block 512. A rotating cylinder 515 that fits against the surface of the actuator connecting rod 4 is welded and fixed to the top of the connecting cover 514. An arc-shaped surrounding groove 516 is opened on the surface of the rotating cylinder 515. The connecting column 401 is slidably installed inside the arc-shaped surrounding groove 516.

[0029] When the actuator connecting rod 4 extends, the connecting column 401 slides along the arc-shaped circumferential groove 516, thereby driving the connecting cover 514 to rotate, causing the rotating block 512 to rotate, which in turn drives the abutment block 509 to slide in the straight groove 508 toward the actuator connecting rod 4, thus fixing the actuator connecting rod 4.

[0030] Furthermore, a fixing seat 402, sleeved on the outer wall of the actuator connecting rod 4, is welded and fixed to the bottom of the actuator body 1. A top cover 503, sleeved on the outer wall of the actuator connecting rod 4, is welded and fixed to the top of the protective cover 501. A locking block 504, which cooperates with the fixing seat 402, is welded and fixed to the top of the top cover 503 for connecting the fixing seat 402. The locking block 504 of the top cover 503 cooperates with the fixing seat 402 to achieve quick positioning and connection between the self-locking component 5 and the actuator body 1, simplifying the installation process.

[0031] Furthermore, a bottom cover 506 is welded and fixed to the bottom of the fixed plate 505, and the bottom cover 506 is fixed to the inner wall of the protective cover 501.

[0032] The bottom cover 506 is fixed to the inner wall of the fixed plate 505 and the protective cover 501, forming a closed bottom protection structure to prevent dust and oil from entering the self-locking component 5 and affecting the transmission; the bottom cover 506 supports the fixed plate 505, enhances the load-bearing capacity of the fixed plate 505, and prevents the fixed plate 505 from deforming when the actuator connecting rod 4 is under force.

[0033] Furthermore, the side wall of the fixed plate 505 is provided with a plurality of mounting holes 507, and the surface of the protective cover 501 is provided with a plurality of mounting holes 502 that mate with the mounting holes 507. Mounting screws 517 are installed in the internal threads of the mounting holes 502 and the mounting holes 507. The fixed plate 505 and the protective cover 501 are fixed by the mounting screws 517.

[0034] Furthermore, the abutment 509 is provided with several rubber blocks 511 on the side facing the actuator connecting rod 4 to increase friction. The rubber blocks 511 are elastic and can adapt to minor unevenness on the surface of the actuator connecting rod 4, avoiding wear of components caused by rigid contact and extending the service life of the actuator connecting rod 4.

[0035] Furthermore, a handwheel 2 is provided on one side of the actuator body 1. The handwheel 2 is connected to the internal structure of the actuator body 1 and is used to drive the actuator when the electric motor fails.

[0036] Furthermore, a locking mechanism 3 is provided on the top of the actuator body 1 to lock the interior of the actuator body 1 and control the state of the actuator body 1.

[0037] In actual operation, when this device is used, the actuator connecting rod 4 at the output end of the actuator body 1 is used to transmit power; the self-locking component 5 is sleeved on the outside of the actuator connecting rod 4, and the internal structure is encapsulated and protected by the protective cover 501. The bottom of the fixed plate 505 cooperates with the inner wall of the protective cover 501 to provide stable support for the self-locking mechanism.

[0038] The straight sliding groove 508 inside the fixed plate 505 surrounds the actuator connecting rod 4, which guides the abutment 509 so that the abutment 509 can only slide radially. The end of the abutment 509 away from the actuator connecting rod 4 is fixed with a limiting post 510. The rotating block 512 is rotatably mounted on the top of the fixed plate 505 and sleeved on the outside of the actuator connecting rod 4. The arc-shaped sliding groove 513 on its surface slides and engages with the limiting post 510 to form a power conversion structure. The connecting cover 514 is fixed on the top of the fixed plate 505 to limit the rotating block 512 in a fixed space. The rotating cylinder 515 on its top fits against the surface of the actuator connecting rod 4. The arc-shaped surrounding sliding groove 516 is adapted to the connecting post 401.

[0039] During device assembly, first fix the bottom cover 506 to the bottom of the fixed plate 505 and connect it to the inner wall of the protective cover 501. Through the cooperation of the mounting hole 1 502, the mounting hole 2 507 and the mounting screw 517, the fixed plate 505 and the protective cover 501 are firmly locked. Then, the top cover 503 on the top of the protective cover 501 is put on the actuator connecting rod 4, so that the locking block 504 of the top cover 503 is engaged with the fixing seat 402 at the bottom of the actuator body 1, thus completing the overall assembly of the self-locking component 5 and the actuator body 1.

[0040] During electric actuation, the actuator body 1 drives the actuator connecting rod 4 to move axially. The connecting column 401 slides along the arc-shaped groove 516 of the rotating drum 515, causing the rotating drum 515 and the connecting cover 514 to rotate synchronously, thereby driving the rotating block 512 to rotate on the top of the fixed plate 505. The arc-shaped groove 513 of the rotating block 512 pushes the abutment 509 along the straight groove 508 towards the actuator connecting rod 4 through the limiting column 510. The rubber block 511 of the abutment 509 is tightly attached to the surface of the actuator connecting rod 4, and self-locking is achieved through friction to prevent the actuator connecting rod 4 from moving in the opposite direction due to the load. When it is necessary to release the self-locking, the actuator body 1 drives the actuator connecting rod 4 in the opposite direction, the connecting column 401 drives the rotating block 512 to rotate in the opposite direction, the arc-shaped groove 513 pulls the abutment 509 to reset, and the self-locking is released.

[0041] If the electric system fails, turn the handwheel 2 on one side of the actuator body 1 to drive the actuator connecting rod 4 through the internal transmission structure, and the self-locking mechanism will take effect simultaneously.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A self-locking device for an electric actuator, comprising an actuator body (1) and a self-locking assembly (5), characterized in that: The self-locking component (5) is sleeved on the output end of the actuator body (1). The output end of the actuator body (1) is the actuator connecting rod (4). A connecting column (401) is welded and fixed on the surface of the actuator connecting rod (4). The self-locking assembly (5) includes a protective cover (501). A fixed plate (505) through which the actuator connecting rod (4) passes is welded and fixed to the bottom of the protective cover (501). The fixed plate (505) has several straight sliding grooves (508) arranged at a fixed angle around the actuator connecting rod (4). A stop block (509) is slidably installed inside the straight sliding groove (508). A limit post (510) is welded and fixed to one end of the stop block (509) away from the actuator connecting rod (4). The top of the fixed plate (505) is rotatably mounted with a rotating block (512) sleeved on the outside of the actuator connecting rod (4). The surface of the rotating block (512) is provided with an arc-shaped groove (513) in the same number as the straight groove (508). The limiting post (510) is slidably installed inside the arc-shaped groove (513). The top of the rotating block (512) is welded and fixed with a connecting cover (514), and the top of the connecting cover (514) is welded and fixed with a rotating cylinder (515) that fits against the surface of the actuator connecting rod (4). An arc-shaped surrounding groove (516) is opened on the surface of the rotating cylinder (515), and the connecting column (401) is slidably installed inside the arc-shaped surrounding groove (516).

2. The self-locking device for an electric actuator according to claim 1, characterized in that: The bottom of the actuator body (1) is welded and fixed with a fixing seat (402) sleeved on the outer wall of the actuator connecting rod (4), and the top of the protective cover (501) is welded and fixed with a top cover (503) sleeved on the outer wall of the actuator connecting rod (4). The top of the top cover (503) is welded and fixed with a locking block (504) that cooperates with the fixing seat (402) for connecting the fixing seat (402).

3. The self-locking device for an electric actuator according to claim 1, characterized in that: The bottom of the fixed plate (505) is welded and fixed with a bottom cover (506), and the bottom cover (506) is fixed to the inner wall of the protective cover (501).

4. The self-locking device for an electric actuator according to claim 1, characterized in that: The side wall of the fixed plate (505) is provided with a plurality of mounting holes 2 (507), and the surface of the protective cover (501) is provided with a plurality of mounting holes 1 (502) that cooperate with the mounting holes 2 (507). The internal threads of the mounting holes 1 (502) and the mounting holes 2 (507) are fitted with mounting screws (517).

5. The self-locking device for an electric actuator according to claim 1, characterized in that: The abutment (509) has several rubber blocks (511) on the side facing the actuator connecting rod (4) to increase friction.

6. The self-locking device for an electric actuator according to claim 1, characterized in that: A handwheel (2) is provided on one side of the actuator body (1). The handwheel (2) is connected to the internal structure of the actuator body (1) and is used to drive the actuator when the electric motor fails.

7. The self-locking device for an electric actuator according to claim 1, characterized in that: The top of the actuator body (1) is provided with a locking mechanism (3) for locking the inside of the actuator body (1) and controlling the state of the actuator body (1).

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