A linear electric actuator anti-overshoot device

Abstract

This utility model discloses an anti-overrun device for a linear electric actuator, comprising an actuator housing, an internal motor, a threaded rod connected to the output shaft of the motor, a threaded sleeve threaded onto the threaded rod, a fixing plate fixed to the side of the threaded sleeve, a connecting rod fixed to the bottom of the fixing plate, a metal sensing plate mounted on the fixing plate, a support plate mounted inside the actuator housing via a support mechanism for buffering support of the support plate, an inductive limit switch and a micro-motion limit switch mounted on the support plate, and a control processor mounted on the side of the actuator housing. This utility model, through innovative structural design and multiple protection mechanisms, effectively prevents the electric actuator from overrunning during operation, improving the safety, stability, and reliability of equipment operation, and reducing equipment maintenance costs and production risks.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, and in particular to an anti-collision device for a linear electric actuator. Background Technology

[0002] Linear electric actuators are commonly used to control the linear motion of valves, baffles, and other equipment. In actual operation, due to control system failures, signal interference, or wear of mechanical parts, electric actuators may overrun and cause overshoot.

[0003] Chinese patent application CN216813065U discloses an anti-overrun device for a linear electric actuator. In this patent, a screw and a matching threaded sleeve are set up. The screw rotation can drive the threaded sleeve to move, thereby driving the opening and closing of the gate. The connecting body and the threaded sleeve are connected by a limit block and a connecting groove. The extreme position of the threaded sleeve is limited by a push block. This can limit the overrun when it occurs, prevent the motor from overloaded and burned out, protect the electric actuator, and improve the reliability of the electric actuator.

[0004] When using the aforementioned patent, we found that the device relies on the hard contact of the mechanical structure to achieve anti-impact. When the push block collides with the partition or valve body, it will generate a large impact force. Long-term use will easily lead to component wear, reducing the reliability and service life of the device. Therefore, we propose a linear electric actuator anti-impact device. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a linear electric actuator anti-collision device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An anti-impact device for a linear electric actuator includes an actuator housing, a motor installed inside the actuator housing, a threaded rod connected to the output shaft of the motor, a threaded sleeve threaded onto the threaded rod, a fixing plate fixed to the side of the threaded sleeve, a connecting rod fixed to the bottom of the fixing plate, a metal sensing plate installed on the fixing plate, a support plate installed inside the actuator housing via a support mechanism for buffering support of the support plate, an inductive limit switch and a micro limit switch installed on the support plate, and a control processor installed on the side of the actuator housing.

[0008] Preferably, the support mechanism includes a guide rod, a guide block, a spring, and a support rod. The guide rod is fixed inside the actuator housing. A guide block is slidably sleeved on the guide rod. A spring is installed between the guide block and the actuator housing. The spring is sleeved on the guide rod. A support rod is hinged to the top of the guide block. The support rod is hinged to a support plate.

[0009] Preferably, the actuator housing has a guide groove inside, and the guide block is slidably installed in the guide groove.

[0010] Preferably, the actuator housing has a sliding groove inside, and the fixing plate is slidably installed in the sliding groove.

[0011] Preferably, the actuator housing has a through hole on its side, and a ventilation and dustproof mesh is installed inside the through hole.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this utility model, the motor is started, and through the threaded transmission between the threaded rod and the threaded sleeve, the threaded sleeve drives the fixed plate to move up and down, so that the fixed plate drives the connecting rod to move, thereby transmitting the motion of the electric actuator to the external equipment and realizing linear drive control of the external equipment.

[0014] 2. In this utility model, a dual limit protection mechanism of inductive limit switch and micro limit switch is adopted. The inductive limit switch can sense and send a stop signal in advance when the electric actuator is close to the limit position of the stroke, so as to achieve precise control. The micro limit switch serves as a backup protection measure and can still be triggered in time when the inductive limit switch fails, so as to effectively prevent the occurrence of overshooting under any circumstances, which greatly improves the reliability and safety of the anti-overshooting device.

[0015] 3. In this utility model, when the support plate is subjected to pressure from components such as the threaded block and the fixed plate, the support rod will push the guide block to slide on the guide rod and compress the spring. The elastic force generated after the spring is compressed acts in the opposite direction on the guide block, so that the support rod provides buffer support for the support plate, thereby reducing the damage to the internal components caused by the impact force generated by the movement and extending the service life of the electric actuator. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the anti-collision device for a linear electric actuator proposed in this utility model;

[0017] Figure 2 This is a structural cross-sectional view of an anti-collision device for a linear electric actuator proposed in this utility model;

[0018] Figure 3This is a schematic diagram of the support mechanism for an anti-collision device for a linear electric actuator proposed in this utility model.

[0019] In the diagram: 1. Actuator housing, 2. Motor, 3. Threaded rod, 4. Threaded sleeve, 5. Fixing plate, 6. Connecting rod, 7. Metal sensing plate, 8. Support mechanism, 81. Guide rod, 82. Guide block, 83. Spring, 84. Support rod, 9. Support plate, 10. Inductive limit switch, 11. Micro limit switch, 12. Control processor, 13. Ventilation and dustproof net. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figure 1 , Figure 2 A linear electric actuator anti-impact device includes an actuator housing 1, a motor 2 installed inside the actuator housing 1, a threaded rod 3 connected to the output shaft of the motor 2, a threaded sleeve 4 threadedly connected to the threaded rod 3, a fixing plate 5 fixed to the side of the threaded sleeve 4, a sliding groove opened inside the actuator housing 1, the fixing plate 5 slidably installed in the sliding groove, and a connecting rod 6 fixed to the bottom of the fixing plate 5. When the motor 2 is started, the threaded transmission between the threaded rod 3 and the threaded sleeve 4 causes the threaded sleeve 4 to drive the fixing plate 5 to move up and down, thereby causing the fixing plate 5 to drive the connecting rod 6 to move, thus transmitting the motion of the electric actuator to external equipment and realizing linear drive control of the external equipment. A metal sensing plate 7 is installed on the fixing plate 5. A support plate 9 is installed inside the actuator housing 1 through a support mechanism 8, which is used for buffer support of the support plate 9. An inductive limit switch 10 and a micro limit switch are installed on the support plate 9. 11. A control processor 12 is installed on the side of the actuator housing 1. A through hole is opened on the side of the actuator housing 1, and a ventilation and dustproof mesh 13 is installed inside the through hole. When the fixed plate 5 moves with the threaded sleeve 4, the metal sensing plate 7 also moves. When the metal sensing plate 7 approaches the inductive limit switch 10, the inductive limit switch 10 can sense the presence of the metal sensing plate 7 and transmit the sensing signal to the control processor 12. After receiving the signal, the control processor 12 immediately issues a command to control the motor 2 to stop running, thereby preventing the electric actuator from continuing to move and causing overshoot. If the inductive limit switch 10 malfunctions and cannot work normally, when the fixed plate 5 continues to move and touches the micro limit switch 11, the micro limit switch 11 will transmit a trigger signal to the control processor 12. The control processor 12 will also control the motor 2 to stop running, playing a double insurance role and ensuring effective prevention of overshoot.

[0022] Reference Figure 3The support mechanism 8 includes a guide rod 81, a guide block 82, a spring 83, and a support rod 84. The guide rod 81 is fixed inside the actuator housing 1. The guide block 82 is slidably sleeved on the guide rod 81. A guide groove is provided inside the actuator housing 1, and the guide block 82 is slidably installed in the guide groove. A spring 83 is installed between the guide block 82 and the actuator housing 1. The spring 83 is sleeved on the guide rod 81. The top of the guide block 82 is hinged to the support rod 84, which is hinged to the support plate 9. When the support plate 9 is subjected to pressure from components such as the threaded block 4 and the fixed plate 5, the support rod 84 will push the guide block 82 to slide on the guide rod 81 and compress the spring 83. The elastic force generated after the spring 83 is compressed acts in the opposite direction on the guide block 82, so that the support rod 84 provides buffer support for the support plate 85. This can reduce the damage to the internal components caused by the impact force generated by the movement and extend the service life of the electric actuator.

[0023] Working Principle: Before use, a safety threshold is set for the control processor 12. When the electric actuator needs to drive external equipment for linear motion, the motor 2 is started. Through the threaded transmission between the threaded rod 3 and the threaded sleeve 4, the threaded sleeve 4 drives the fixed plate 5 to move up and down, causing the fixed plate 5 to drive the connecting rod 6 to move. This allows the motion of the electric actuator to be transmitted to the external equipment, achieving linear drive control of the external equipment. When the fixed plate 5 moves with the threaded sleeve 4, the metal sensing plate 7 also moves. When the metal sensing plate 7 approaches the inductive limit switch 10, the inductive limit switch 10 can sense the presence of the metal sensing plate 7 and transmit the sensing signal to the control processor 12. After receiving the signal, the control processor 12 immediately issues a command to stop the motor 2, thereby preventing the electric actuator from continuing to operate. If the continuous movement causes the actuator to overshoot, and the inductive limit switch 10 malfunctions and cannot work properly, when the fixed plate 5 continues to move and touches the micro limit switch 11, the micro limit switch 11 will transmit a trigger signal to the control processor 12. The control processor 12 will also control the motor 2 to stop running, which plays a double insurance role and ensures that the overshoot phenomenon is effectively prevented. During this process, when the support plate 9 is subjected to pressure from the threaded block 4, the fixed plate 5 and other components, the support rod 84 will push the guide block 82 to slide on the guide rod 81 and compress the spring 83. The elastic force generated after the spring 83 is compressed acts in the opposite direction on the guide block 82, so that the support rod 84 provides buffer support for the support plate 85, thereby reducing the damage to the internal components caused by the impact force generated by the movement and extending the service life of the electric actuator.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A top-of-travel device for a direct-acting electric actuator, comprising an actuator housing (1), characterized in that The actuator housing (1) is equipped with a motor (2). A threaded rod (3) is connected to the output shaft of the motor (2). A threaded sleeve (4) is threaded onto the threaded rod (3). A fixing plate (5) is fixed to the side of the threaded sleeve (4). A connecting rod (6) is fixed to the bottom of the fixing plate (5). A metal sensing plate (7) is installed on the fixing plate (5). A support plate (9) is installed inside the actuator housing (1) through a support mechanism (8). The support mechanism (8) is used to buffer the support plate (9). An inductive limit switch (10) and a micro-motion limit switch (11) are installed on the support plate (9). A control processor (12) is installed on the side of the actuator housing (1).

2. A top stop for a linear actuator as defined in claim 1, wherein, The support mechanism (8) includes a guide rod (81), a guide block (82), a spring (83), and a support rod (84). The guide rod (81) is fixed inside the actuator housing (1). The guide block (82) is slidably sleeved on the guide rod (81). A spring (83) is installed between the guide block (82) and the actuator housing (1). The spring (83) is sleeved on the guide rod (81). The top of the guide block (82) is hinged to the support rod (84). The support rod (84) is hinged to the support plate (9).

3. A top stop for a linear actuator as defined in claim 2, wherein: The actuator housing (1) has a guide groove inside, and the guide block (82) is slidably installed in the guide groove.

4. The anti-impact device for a linear electric actuator according to claim 1, characterized in that, The actuator housing (1) has a sliding groove inside, and the fixing plate (5) is slidably installed in the sliding groove.

5. The anti-impact device for a linear electric actuator according to claim 1, characterized in that, The actuator housing (1) has a through hole on its side, and a ventilation and dustproof mesh (13) is installed inside the through hole.

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