Spring return electric actuator

Abstract

The utility model discloses a spring reset type electric actuator, include: drive mechanism, reset mechanism, transmission shaft, connecting block, drive mechanism include: casing, reset mechanism include: spring base, spring, guide rod, steel wire rope no.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, specifically to a spring-reset electric actuator. Background Technology

[0002] Electric actuators are automated control devices that use electricity as their core driving source. Their core function is to convert the electrical signals output by the controller into mechanical motion, thereby precisely controlling industrial equipment such as valve cores, dampers, and baffles. As the "execution terminal" of an industrial control system, their positioning accuracy directly affects the stability and production efficiency of the entire system.

[0003] In the prior art, if the valve core controlled by the electric actuator is stuck in the middle position due to power failure or signal loss, it may cause medium leakage, pressure change or mechanical collision. The valve core cannot be closed immediately when the motor stops working. It may still be stuck in a dangerous position due to mechanical jamming or electrical failure. After power failure or signal interruption, the actuator is stuck in a random position. When power is restored, the controller cannot recognize the actual position, resulting in deviation of subsequent command execution. Utility Model Content

[0004] The purpose of this utility model is to provide a spring-reset electric actuator that, when the actuator stops due to overload, stall, or abnormal signal, forces the valve core back to the "0%" stroke position (closed state) through an internal reset mechanism without waiting for technicians or special tools. This significantly reduces economic losses caused by actuator failure. The reset mechanism controls the actuator back to the default closed state, and it can be used immediately without calibration when restarting the actuator, reducing the secondary damage to the equipment caused by manual reset. This solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a spring-reset electric actuator, comprising: a drive mechanism, a reset mechanism, a transmission shaft, and a connecting block. The drive mechanism includes: a housing. The reset mechanism includes: a spring base, a spring, a guide rod, a second steel wire rope, a second spool, a third spool, and a connecting member. The spring base is fixedly installed on one inner wall of the housing. The spring is fixedly installed on the inner wall of the spring base. The guide rod is fixedly installed at the end of the spring away from the spring base. The guide rod is slidably connected to the spring base. The second spool is fixedly sleeved on the upper part of the connecting member. The third spool is fixedly sleeved on the lower part of the connecting member. The second steel wire rope is wound around the second spool, and one end of the second steel wire rope is fixedly connected to the guide rod.

[0006] Furthermore, the connector is fixedly mounted on the top end of the drive shaft.

[0007] Furthermore, the drive mechanism also includes a brushless motor, a reel, and a wire rope, wherein the brushless motor is fixedly mounted on the inner wall of one side of the housing.

[0008] Furthermore, the reel is fixedly mounted on the output shaft of the brushless motor.

[0009] Furthermore, the first wire rope is wound around the first spool, and one end of the first wire rope is wound around the third spool.

[0010] Furthermore, the drive shaft is rotatably mounted on the bottom inner wall of the housing.

[0011] Furthermore, the connecting block is fixedly installed on the bottom outer wall of the housing, and the drive shaft is rotatably connected to the connecting block.

[0012] In summary, due to the adoption of the above-mentioned technologies, the beneficial effects of this utility model are:

[0013] This invention, by setting a reset mechanism, can force the valve core back to the "0%" stroke position (closed state) without waiting for technicians or special tools when the actuator stops due to overload, stall, or abnormal signal. This significantly reduces the economic losses caused by actuator failure, controls the actuator to return to the default closed state, and allows it to be used immediately without calibration when restarting the actuator, reducing secondary damage to the equipment caused by manual reset. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a spring-reset electric actuator according to the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of a valve body mounted on a spring-reset electric actuator according to the present invention;

[0016] Figure 3 This is a partial three-dimensional sectional view of the shell of this utility model;

[0017] Figure 4 In this utility model Figure 2 A schematic diagram of the cross-sectional structure;

[0018] Figure 5 This utility model Figure 4 A magnified structural diagram of part A in the middle;

[0019] Figure 6 This utility model Figure 4 A magnified structural diagram of part B in the middle section;

[0020] In the diagram: 1. Drive mechanism; 101. Housing; 102. Brushless motor; 103. Wire reel one; 104. Wire rope one; 2. Reset mechanism; 201. Spring base; 202. Spring; 203. Guide rod; 204. Wire rope two; 205. Wire reel two; 206. Wire reel three; 207. Connecting part; 3. Drive shaft; 4. Connecting block. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] This utility model provides, for example Figure 1-5 As shown, a spring-return electric actuator includes: a drive mechanism 1, a reset mechanism 2, a transmission shaft 3, and a connecting block 4. The drive mechanism 1 includes a housing 101. The reset mechanism 2 includes: a spring base 201, a spring 202, a guide rod 203, a second wire rope 204, a second reel 205, a third reel 206, and a connecting piece 207. The spring base 201 is fixedly installed on one inner wall of the housing 101, the spring 202 is fixedly installed on the inner wall of the spring base 201, and the guide rod 203 is fixedly installed on the outer wall of the spring 202. At one end away from the spring base 201, the guide rod 203 is slidably connected to the spring base 201. The second spool 205 is fixedly sleeved on the upper part of the connector 207, and the third spool 206 is fixedly sleeved on the lower part of the connector 207. The second wire rope 204 is wound on the second spool 205, and one end of the second wire rope 204 is fixedly connected to the guide rod 203. The spring 302 is a helical spring with a torque of 4-15 Nm to meet the torque requirements when resetting the valve body. The second wire rope 204 is wound on the second spool 205 with a quarter turn.

[0023] In addition, the connector 207 is fixedly installed on the top end of the drive shaft 3.

[0024] In addition, the drive mechanism 1 also includes: a brushless motor 102, a reel 103, and a wire rope 104. The brushless motor 102 is fixedly installed on the inner wall of one side of the housing 101. The model of the brushless motor 102 is an SEA314 / 514 brushless motor to meet the working requirements of the actuator.

[0025] In addition, the reel 103 is fixedly mounted on the output shaft of the brushless motor 102.

[0026] In addition, the wire rope 104 is wound around the reel 103, and one end of the wire rope 104 is wound around the reel 206.

[0027] In addition, the drive shaft 3 is rotatably mounted on the bottom inner wall of the housing 101.

[0028] In addition, the connecting block 4 is fixedly installed on the bottom outer wall of the housing 101, the transmission shaft 3 is rotatably connected to the connecting block 4, a control valve is fixedly installed at the bottom of the connecting block 4, the transmission shaft 3 is rotatably connected to the valve body of the control valve, and the transmission shaft 3 is fixedly connected to the valve core of the control valve.

[0029] Working principle:

[0030] Step 1: Start the brushless motor 102. The spool 103 rotates to wind up the first wire rope 104. The first wire rope 104 controls the rotation of the third spool 206. The second spool 205, the connector 207, and the drive shaft follow the rotation of the third spool 206. After the drive shaft 3 follows the third spool 206 to rotate a quarter turn, the drive shaft 3 controls the valve core 6 to be in the open state. At the same time, the second spool 205 rotates to wind up the second wire rope 204. The second wire rope 204 winds up and pulls the guide rod 203 to move outward. The movement of the guide rod 203 drives the spring 202 to move, and the spring 202 is in the stretched state.

[0031] Step 2: When an abnormality occurs and the brushless motor 102 stops working, the spring 202 is in a contracted state and pulls back the guide rod 203. The guide rod 203 moves and pulls the steel wire rope 204. The steel wire rope 204 drives the spool 205 to rotate. The connector 207, the drive shaft 3, and the spool 3 206 follow the rotation of the spool 205. The rotation of the drive shaft 3 controls the rotation of the valve core, and the valve core returns to the closed state. At the same time, the spool 3 206 rotates to wind up the steel wire rope 104, so that the brushless motor 102 returns to the closed state.

[0032] 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.

[0033] 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 process, method, article, or apparatus.

Claims

1. A spring-return electric actuator, characterized by: The device includes a drive mechanism (1), a reset mechanism (2), a transmission shaft (3), and a connecting block (4). The drive mechanism (1) includes a housing (101). The reset mechanism (2) includes a spring base (201), a spring (202), a guide rod (203), a second steel wire rope (204), a second spool (205), a third spool (206), and a connecting piece (207). The spring base (201) is fixedly installed on one inner wall of the housing (101), and the spring (202) is fixedly installed on the spring base. On the inner wall of (201), the guide rod (203) is fixedly installed at the end of the spring (202) away from the spring base (201). The guide rod (203) is slidably connected to the spring base (201). The second spool (205) is fixedly sleeved on the upper part of the connector (207). The third spool (206) is fixedly sleeved on the lower part of the connector (207). The second wire rope (204) is wound on the second spool (205). One end of the second wire rope (204) is fixedly connected to the guide rod (203).

2. A spring-return electric actuator according to claim 1, characterized in that: The connector (207) is fixedly installed on the top of the drive shaft (3).

3. A spring-return electric actuator according to claim 1, characterized in that: The drive mechanism (1) further includes: a brushless motor (102), a reel (103) and a wire rope (104), wherein the brushless motor (102) is fixedly installed on the inner wall of one side of the housing (101).

4. A spring-return electric actuator according to claim 3, wherein: The spool (103) is fixedly mounted on the output shaft of the brushless motor (102).

5. A spring-return electric actuator according to claim 3, wherein: The first wire rope (104) is wound on the first spool (103), and one end of the first wire rope (104) is wound on the third spool (206).

6. A spring-return electric actuator according to claim 1, characterized in that: The drive shaft (3) is rotatably mounted on the bottom inner wall of the housing (101).

7. A spring-return electric actuator according to claim 1, characterized in that: The connecting block (4) is fixedly installed on the bottom outer wall of the housing (101), and the drive shaft (3) is rotatably connected to the connecting block (4).

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