Electric actuator with high-precision torque detection and high-precision valve position detection

Abstract

The invention discloses an electric actuator with high-precision torque detection and high-precision valve position detection, which belongs to the technical field of electric actuators, and comprises a shell, a main shaft is arranged on the inner bottom surface of the shell in a penetrating manner, a first gear is arranged on the main shaft, a mounting block is fixed on the inner wall of the shell, and a rotating shaft is arranged on the top surface of the mounting block in a penetrating manner; a second gear is arranged at the bottom end of the rotating shaft, the first gear is meshed with the second gear, a driving assembly used for driving the main shaft to rotate is arranged in the shell, a torque detection and valve position detection device is arranged in the shell, and a redundant torque detection and redundant valve position detection mechanism is arranged at the output end of the main shaft. The method has the effect of high-precision detection of the torque and the valve position of the electric actuator.

Description

Technical Field

[0001] This invention relates to the technical field of electric actuators, and in particular to an electric actuator with high-precision torque detection and high-precision valve position detection. Background Technology

[0002] An electric actuator is an electrically operated mechanism for driving valves. The torque detection mechanism and the valve position detection mechanism are the core and critical components of an electric actuator. The torque detection mechanism determines whether the actuator has the appropriate torque to open or close the valve, while protecting the electric actuator and valve from excessive torque to avoid damage. The valve position detection mechanism determines the accuracy of the actuator's operating position.

[0003] Existing electric actuators typically use pressure sensors or motor dynamometers to indirectly detect the output torque of the electric actuator via conversion by an electronic control unit, and use potentiometers as sensors to detect the valve position. As a result, the torque and valve position detection accuracy of electric actuators is relatively low. Summary of the Invention

[0004] To address the issue of low torque and valve position detection accuracy in electric actuators, this application provides an electric actuator with high-precision torque detection and high-precision valve position detection.

[0005] The electric actuator with high-precision torque detection and high-precision valve position detection provided in this application adopts the following technical solution: An electric actuator with high-precision torque detection and high-precision valve position detection includes a housing, a main shaft passing through the inner bottom surface of the housing, a first gear being mounted on the main shaft, a mounting block being fixed to the inner wall of the housing, a rotating shaft passing through the top surface of the mounting block, a second gear being mounted at the bottom end of the rotating shaft, the first gear meshing with the second gear, a drive assembly for driving the rotation of the main shaft being disposed within the housing, a torque detection and valve position detection device being disposed within the housing, and a redundant torque detection and redundant valve position detection mechanism being disposed at the output end of the main shaft.

[0006] By adopting the above technical solution, the drive assembly is activated, causing the drive assembly to drive the rotating shaft to rotate. The rotating shaft drives the second gear to rotate, which in turn drives the first gear to rotate. The first gear drives the main shaft to rotate, which in turn drives the valve. The torque and valve position output by the electric actuator are detected by a torque detection and valve position detection device installed in the housing. At the same time, redundant torque detection and redundant valve position detection mechanisms are set at the output end of the electric actuator to directly detect the torque and valve position output by the electric actuator, thereby achieving high-precision detection of the torque and valve position of the electric actuator.

[0007] Preferably, the drive assembly includes a motor disposed within the housing, a third gear is disposed at the bottom end of the motor output shaft, and a fourth gear is disposed at the top end of the rotating shaft, wherein the third gear meshes with the fourth gear.

[0008] By adopting the above technical solution, the motor is started, the output shaft of the motor drives the third gear to rotate, the third gear drives the fourth gear to rotate, thereby causing the fourth gear to drive the rotating shaft to rotate.

[0009] Preferably, the redundant torque detection and redundant valve position detection mechanism includes a fixed bracket disposed at the bottom end of the housing, a connector for connecting to the fixed bracket is disposed on the housing, a torque and speed sensor is disposed inside the fixed bracket, a bushing is sleeved at the bottom end of the main shaft, the bottom end of the bushing passes through the inner top surface of the fixed bracket, the top end of the torque and speed sensor is inserted into the bushing, the bottom end of the torque and speed sensor is mounted on the inner bottom surface of the fixed bracket through a bearing, and an output flange is disposed at the bottom end of the fixed bracket.

[0010] By adopting the above technical solution, a torque and speed sensor is set at the output end of the main shaft, so that the torque and speed sensor can directly detect the output torque and speed of the electric actuator, thereby improving the torque detection accuracy and valve position detection accuracy of the electric actuator.

[0011] Preferably, a connecting shell is fixed to the outer peripheral surface of the housing, the connecting shell is connected to the housing, a worm gear is provided on the main shaft, a worm is rotatably provided inside the connecting shell, the worm meshes with the worm gear, one end of the worm protrudes through the side of the connecting shell, and a rotating wheel is provided at the end of the worm.

[0012] By adopting the above technical solution, rotating the wheel drives the worm gear to rotate, the worm gear drives the worm wheel to rotate, the worm wheel drives the main shaft to rotate, and the main shaft drives the valve to rotate, thus facilitating manual adjustment of the valve position.

[0013] Preferably, the torque detection and valve position detection device includes a torque encoder disposed in the housing and a single-turn absolute coded position sensor disposed at the top of the main shaft. An annular groove is formed on the outer circumferential surface of the worm gear, and the bottom end of the torque encoder is inserted into the annular groove.

[0014] By adopting the above technical solution, when the spindle rotates, the spindle drives the worm wheel to rotate, the worm wheel drives the worm to rotate, and the output torque on the worm wheel will act on the worm, causing the worm to move axially under the action of axial force. When the worm moves axially, it triggers the torque encoder, thereby enabling the torque encoder to detect the torque generated by the spindle. The single-turn absolute encoder position sensor is installed at the top of the spindle, thereby enabling the single-turn absolute encoder position sensor to monitor the valve position in real time.

[0015] Preferably, both ends of the worm gear are fitted with limiting rings, and both ends of the worm gear are fitted with butterfly springs. One end of the butterfly spring abuts against the limiting ring, and the other end of the butterfly spring abuts against the inner wall of the connecting shell.

[0016] By adopting the above technical solution, butterfly springs are set at both ends of the worm. When the torque output by the worm wheel increases and the worm's axial force pushes the worm to move, the worm's axial movement slows down under the elastic force of the butterfly springs. This makes it easier to improve the detection accuracy of the torque encoder. At the same time, when the spindle stops rotating, it is easy for the worm to reset under the elastic force of the butterfly springs.

[0017] Preferably, an electrical control unit is provided on the housing, the output terminal of the single-turn absolute coded position sensor is electrically connected to the input terminal of the electrical control unit, and the output terminal of the electrical control unit is electrically connected to the control terminal of the motor.

[0018] By adopting the above technical solution, the valve position signal detected by the single-turn absolute coded position sensor is transmitted to the electrical control unit. The electrical control unit compares the received valve position signal with the set valve position signal. When the valve position signal received by the electrical control unit is greater than the set signal, the control unit issues a command to cut off the motor power supply, so that the motor stops rotating, thereby protecting the electric valve.

[0019] Preferably, the connector includes a connecting flange disposed at the bottom end of the housing, and the connecting flange is fixedly connected to the housing and the fixed bracket respectively by bolts.

[0020] By adopting the above technical solution, a connecting flange is set between the housing and the fixed bracket, thereby fixing the fixed bracket and the housing together.

[0021] Preferably, the housing is provided with a torque valve position display operation panel.

[0022] By adopting the above technical solution, the torque and valve position signals received by the electrical control unit are transmitted to the torque valve position display operation panel, which makes it convenient for the staff to directly observe the torque and valve position values.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. Start the drive assembly to drive the rotating shaft to rotate. The rotating shaft drives the second gear to rotate, which in turn drives the first gear to rotate. The first gear drives the main shaft to rotate, which in turn drives the valve. The torque and valve position output by the electric actuator are detected by the torque detection and valve position detection devices installed in the housing. At the same time, redundant torque detection and redundant valve position detection mechanisms are set at the output end of the electric actuator to directly detect the torque and valve position output by the electric actuator, thereby achieving high-precision detection of the torque and valve position of the electric actuator. 2. When the spindle rotates, it drives the worm wheel to rotate, which in turn drives the worm to rotate. The output torque on the worm wheel acts on the worm, causing the worm to move axially under the action of axial force. When the worm moves axially, it triggers the torque encoder, which then detects the torque generated by the spindle. A single-turn absolute encoder position sensor is installed at the top of the spindle, which enables the single-turn absolute encoder position sensor to monitor the valve position in real time. 3. Disc springs are installed at both ends of the worm. When the torque output by the worm wheel increases and the axial force of the worm pushes the worm to move, the axial movement of the worm slows down under the elastic force of the disc springs. This makes it easier to improve the detection accuracy of the torque encoder. At the same time, when the spindle stops rotating, it is easy for the worm to reset under the elastic force of the disc springs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an electric actuator with high-precision torque detection and high-precision valve position detection according to an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the single-loop absolute coded position sensor structure in an embodiment of this application.

[0026] Figure 3 This is a schematic diagram of the torque and speed sensor structure in an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the worm gear structure in an embodiment of this application.

[0028] Reference numerals: 1. Housing; 11. Main shaft; 12. First gear; 13. Mounting block; 14. Rotating shaft; 15. Second gear; 2. Motor; 21. Third gear; 22. Fourth gear; 3. Connecting shell; 31. Worm gear; 32. Rotating wheel; 33. Butterfly spring; 34. Limiting ring; 35. Annular groove; 36. Worm gear; 4. Torque detection and valve position detection device; 41. Torque encoder; 42. Single-turn absolute encoding position sensor; 43. Electrical control unit; 44. Torque valve position display operation panel; 5. Redundant torque detection and redundant valve position detection mechanism; 51. Fixed bracket; 52. Connecting flange; 53. Torque and speed sensor; 54. Bushing; 55. Output flange. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0030] This application discloses an electric actuator with high-precision torque detection and high-precision valve position detection.

[0031] Reference Figure 1 , Figure 2 and Figure 3 As shown, an electric actuator with high-precision torque detection and high-precision valve position detection includes a housing 1. A main shaft 11 passes through the inner bottom surface of the housing 1 and is rotatably connected to the housing 1. A first gear 12 is fixedly mounted on the main shaft 11. A mounting block 13 is fixed to the inner wall of the housing 1. A rotating shaft 14 passes through the top surface of the mounting block 13 and is rotatably connected to the mounting block 13. A second gear 15 is fixedly mounted on the bottom end of the rotating shaft 14, and the first gear 12 meshes with the second gear 15. A motor 2 is fixed inside the housing 1. A third gear 21 is fixedly mounted on the bottom end of the output shaft of the motor 2, and a fourth gear 22 is fixedly mounted on the top end of the rotating shaft 14, and the third gear 21 meshes with the fourth gear 22.

[0032] Reference Figure 2 and Figure 4 A connecting shell 3 is integrally formed on the side of the housing 1, and the connecting shell 3 is connected to the housing 1. A worm gear 31 is rotatably installed between the opposite inner surfaces of the connecting shell 3. One end of the worm gear 31 passes through the end face of the connecting shell 3, and a rotating wheel 32 is fixed to the end of the worm gear 31. A worm wheel 36 is sleeved and fixed on the outer circumferential surface of the main shaft 11, and the worm wheel 36 meshes with the worm gear 31. Limiting rings 34 are fixed to both ends of the worm gear 31, and butterfly springs 33 are sleeved on both ends of the worm gear 31. One end of the butterfly spring 33 abuts against the limiting ring 34, and the other end of the butterfly spring 33 abuts against the inner wall of the connecting shell 3.

[0033] Reference Figure 1 and Figure 2 The housing 1 is equipped with a torque detection and valve position detection device 4, which includes a torque encoder 41 fixed inside the housing 1 and a single-turn absolute coded position sensor 42 mounted on the top of the spindle 11. The outer circumferential surface of the worm gear 31 is provided with an annular groove 35, and the bottom end of the torque encoder 41 is inserted into the annular groove 35.

[0034] Reference Figure 1 and Figure 2 An electrical control unit 43 and a torque valve position display operation panel 44 are fixed on the side of the housing 1. The output terminals of the torque encoder 41 and the single-turn absolute encoder position sensor 42 are electrically connected to the input terminal of the electrical control unit 43. The output terminal of the electrical control unit 43 is electrically connected to the control terminal of the motor 2.

[0035] The single-turn absolute coded position sensor 42 is directly mounted on the top of the spindle 11, which can transmit the position change value of the electric actuator spindle 11 to the electrical control unit for processing in real time, and display its valve position value on the torque valve position display operation panel 44 in real time.

[0036] Reference Figure 1 and Figure 3 The output end of the main spindle 11 is equipped with a redundant torque detection and redundant valve position detection mechanism 5. The redundant torque detection and redundant valve position detection mechanism 5 includes a fixed bracket 51 located at the bottom of the housing 1. A connecting flange 52 is provided on the top surface of the fixed bracket 51. The connecting flange 52 is fixedly connected to the housing 1 and the fixed bracket 51 by bolts. An output flange 55 is fixed at the bottom end of the fixed bracket 51. A torque and speed sensor 53 is installed inside the fixed bracket 51. A bushing 54 is sleeved on the bottom end of the main spindle 11. The bottom end of the bushing 54 passes through the inner top surface of the fixed bracket 51. The top end of the torque and speed sensor 53 is inserted into the bushing 54. The bottom end of the torque and speed sensor 53 is rotatably mounted on the inner bottom surface of the fixed bracket 51 through a bearing.

[0037] The implementation principle of an electric actuator with high-precision torque detection and high-precision valve position detection according to an embodiment of this application is as follows: Starting the motor 2 causes the output shaft of the motor 2 to drive the third gear 21 to rotate. The third gear 21 drives the fourth gear 22 to rotate, the fourth gear 22 drives the rotating shaft 14 to rotate, the rotating shaft 14 drives the second gear 15 to rotate, the second gear 15 drives the first gear 12 to rotate, the first gear 12 drives the main shaft 11 to rotate, and the main shaft 11 drives the valve. When the main shaft 11 rotates, it also drives the worm gear 36 to rotate, causing the worm gear 36 to drive the worm 31 to rotate. The output torque on the worm gear 36 acts on the worm 31, causing the worm 31 to move axially under the action of axial force. When the worm 31 moves axially, it triggers the torque encoder 41, thereby enabling the torque encoder 41 to detect the torque generated by the main shaft 11. A single-turn absolute coded position sensor 42 is installed at the top of the main shaft 11, thereby enabling the single-turn absolute coded position sensor to detect the valve position in real time when the main shaft 11 rotates. Meanwhile, a torque and speed sensor 53 is set at the output end of the main shaft 11, so that the torque and speed sensor 53 can directly detect the output torque and speed of the electric actuator, thereby enabling high-precision detection of torque and valve position.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electric actuator with high-precision torque detection and high-precision valve position detection, characterized in that: The device includes a housing (1), a main shaft (11) passing through the inner bottom surface of the housing (1), a first gear (12) being provided on the main shaft (11), a mounting block (13) being fixed to the inner wall of the housing (1), a rotating shaft (14) passing through the top surface of the mounting block (13), a second gear (15) being provided at the bottom end of the rotating shaft (14), the first gear (12) meshing with the second gear (15), a drive assembly for driving the rotation of the main shaft (11) being provided inside the housing (1), a torque detection and valve position detection device (4) being provided inside the housing (1), and a redundant torque detection and redundant valve position detection mechanism (5) being provided at the output end of the main shaft (11).

2. The electric actuator with high-precision torque detection and high-precision valve position detection according to claim 1, characterized in that: The drive assembly includes a motor (2) disposed in the housing (1), a third gear (21) is disposed at the bottom end of the output shaft of the motor (2), and a fourth gear (22) is disposed at the top end of the rotating shaft (14), the third gear (21) meshing with the fourth gear (22).

3. The electric actuator with high-precision torque detection and high-precision valve position detection according to claim 1, characterized in that: The redundant torque detection and redundant valve position detection mechanism (5) includes a fixed bracket (51) disposed at the bottom of the housing (1). The housing (1) is provided with a connector for connecting to the fixed bracket (51). A torque speed sensor (53) is disposed inside the fixed bracket (51). A bushing (54) is sleeved at the bottom of the main shaft (11). The bottom end of the bushing (54) passes through the inner top surface of the fixed bracket (51). The top end of the torque speed sensor (53) is inserted into the bushing (54). The bottom end of the torque speed sensor (53) is mounted on the inner bottom surface of the fixed bracket (51) through a bearing. An output flange (55) is disposed at the bottom of the fixed bracket (51).

4. An electric actuator with high-precision torque detection and high-precision valve position detection according to claim 2, characterized in that: A connecting shell (3) is fixed to the outer circumferential surface of the housing (1). The connecting shell (3) is connected to the housing (1). A worm gear (36) is provided on the main shaft (11). A worm (31) is rotatably provided inside the connecting shell (3). The worm (31) meshes with the worm gear (36). One end of the worm (31) extends out of the side of the connecting shell (3). A rotating wheel (32) is provided at the end of the worm (31).

5. An electric actuator with high-precision torque detection and high-precision valve position detection according to claim 4, characterized in that: The torque detection and valve position detection device (4) includes a torque encoder (41) disposed in the housing (1) and a single-turn absolute coded position sensor (42) disposed at the top of the main shaft (11). The outer circumferential surface of the worm (31) is provided with an annular groove (35), and the bottom end of the torque encoder (41) is inserted into the annular groove (35).

6. An electric actuator with high-precision torque detection and high-precision valve position detection according to claim 5, characterized in that: Both ends of the worm (31) are fitted with limiting rings (34), and both ends of the worm (31) are fitted with butterfly springs (33). One end of the butterfly spring (33) abuts against the limiting ring (34), and the other end of the butterfly spring (33) abuts against the inner wall of the connecting shell (3).

7. An electric actuator with high-precision torque detection and high-precision valve position detection according to claim 5, characterized in that: An electrical control unit (43) is provided on the housing (1). The output end of the single-turn absolute coding position sensor (42) is electrically connected to the input end of the electrical control unit (43). The output end of the electrical control unit (43) is electrically connected to the control end of the motor (2).

8. An electric actuator with high-precision torque detection and high-precision valve position detection according to claim 3, characterized in that: The connector includes a connecting flange (52) disposed at the bottom end of the housing (1), and the connecting flange (52) is fixedly connected to the housing (1) and the fixed bracket (51) by bolts respectively.

9. An electric actuator with high-precision torque detection and high-precision valve position detection according to claim 7, characterized in that: A torque valve position display operation panel (44) is provided on the housing (1).

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