Angular travel driver with high position detection precision

Abstract

The utility model discloses an angular travel driver with high position detection precision, and relates to the field of valve control devices. The valve rod is rotationally arranged on the supporting part; the position sensor is arranged on the supporting part and is used for detecting a valve rod position signal; the transmission part is arranged on the supporting part and is used for transmitting the valve rod position signal to the position sensor; and the hairspring is arranged at the position sensor and is used for reducing the gear backlash in the transmission part. The method has the effect of improving the detection precision of the driver.

Description

Technical Field

[0001] The present application relates to the field of valve control devices, and in particular to an angular stroke driver with high position detection accuracy. Background Art

[0002] A valve driver is a control device used to remotely control the movement of a valve.

[0003] The patent with publication number CN210290785U discloses a valve driver with valve position adjustment. By arranging an oil cylinder in the hydraulic valve driver, arranging a rack on the piston rod of the oil cylinder, and then arranging a gear on the top of the valve stem, arranging a fixed plate on the outer side of the gear, and arranging contacts on both sides of the fixed plate, and then arranging a No. 1 touch switch and a No. 2 touch switch on the inner wall of the valve body, the oil cylinder can drive the piston rod to extend and shorten, so that the rack on the piston rod moves to drive the gear to rotate, and then the gear rotation drives the fixed plate to rotate, so that when the fixed plate moves to a certain position, the contacts on the fixed plate contact with the No. 1 touch switch and the No. 2 touch switch, so that the No. 1 touch switch and the No. 2 touch switch can be operated, so that the oil cylinder is closed, and the butterfly petal is rotated, so that the butterfly valve can be opened or closed.

[0004] In the process of implementing the above application, the inventor found that there are at least the following problems in this technology: the valve stem position signal is transmitted to the angle sensor, but the transmission is through gear transmission, and the gear set speed change will inevitably be affected by the gear meshing side clearance. The side clearance affects the gear transmission accuracy, thereby affecting the driver position detection accuracy. Utility Model Content

[0005] In order to improve the detection accuracy of the driver, the present application provides an angular stroke driver with high position detection accuracy.

[0006] The present application provides an angular stroke driver with high position detection accuracy, which adopts the following technical solution:

[0007] An angular stroke driver with high position detection accuracy comprises a support portion; a valve stem rotatably disposed on the support portion; a position sensor disposed on the support portion and used to detect a valve stem position signal; a transmission portion disposed on the support portion and used to transmit the valve stem position signal to the position sensor; and a hairspring disposed at the position sensor and used to reduce the gear side clearance in the transmission portion.

[0008] By adopting the above technical solution, the rotation of the valve stem drives the opening and closing of the valve, and the position signal of the valve stem is transmitted to the position sensor through the transmission part. Since the transmission part has a gear structure, the hairspring effectively reduces the influence of the gear side clearance on the gear rotation accuracy. During installation, a unidirectional rotational force is applied to the hairspring in advance, which can make the gears in the transmission part contact and mesh in one direction, so that the meshing side clearance of the gears will not affect the progress of the gear rotation.

[0009] Optionally, the support portion is rotatably connected to a large gear for driving the valve stem to rotate, and the valve stem is inserted through the large gear.

[0010] By adopting the above technical solution, the valve stem is inserted into the large gear, and the valve stem can be driven to rotate by rotating the large gear.

[0011] Optionally, the large gear is a sector gear.

[0012] By adopting the above technical solution, the large gear is a sector gear, so that the rotation range of the large gear is 0° to 90°, that is, the valve stem moves in an angular stroke of 90°.

[0013] Optionally, the transmission part includes a first gear rotatably set on the support part, the first gear is fixed to the end face of the large gear, the support part is rotatably connected to a second gear meshing with the first gear, the support part is rotatably connected to a third gear meshing with the second gear, and the position of the third gear shaft corresponds to the position of the position sensor.

[0014] By adopting the above technical solution, the rotation of the large gear and the valve stem drives the first gear to rotate, the first gear drives the second gear to rotate, and the second gear drives the third gear to rotate. Since the third gear shaft corresponds to the position sensor, the valve stem position information can be transmitted to the position sensor.

[0015] Optionally, the first gear is a sector gear.

[0016] By adopting the above technical solution, the first gear is a sector gear, so the valve stem can drive the first gear to move with an angular stroke of 90°.

[0017] Optionally, the position sensor is a magnetic rotary encoder, and a magnet is fixed to the end of the rotating shaft of the third gear.

[0018] By adopting the above technical solution, the rotation of the third gear can drive the magnet at the end of the third gear to rotate, thereby transmitting the valve stem position signal to the position sensor.

[0019] Optionally, there is a certain distance between the magnet and the position sensor.

[0020] By adopting the above technical solution, there is a certain distance between the magnet and the position sensor, and the two will not contact each other, thereby reducing the influence of friction on transmission accuracy.

[0021] Optionally, a support frame is fixed on the support portion, the rotating shaft of the third gear passes through the support frame, one end of the hairspring is fixed to the side wall of the rotating shaft of the third gear, and the other end is fixed to the side wall of the support frame.

[0022] By adopting the above technical solution, the support frame mainly supports the hairspring, and the hairspring is placed above the third gear. The hairspring can provide rotational force to the gears in the transmission part, thereby effectively reducing the gear side clearance and improving the detection accuracy.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The rotation of the valve stem drives the opening and closing of the valve. The position signal of the valve stem is transmitted to the position sensor through the transmission part. Since the transmission part is a gear structure, the hairspring effectively reduces the influence of the gear side clearance on the gear rotation accuracy. When installing, a unidirectional rotation force is applied to the hairspring in advance, which can make the gears in the transmission part contact and mesh in one direction, so that the meshing side clearance of the gears will not affect the progress of the gear rotation;

[0025] 2. There is a certain distance between the magnet and the position sensor, and the two will not contact each other, thus reducing the impact of friction on transmission accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the transmission part connection method.

[0028] Figure 3 yes Figure 2 Enlarged view of part A.

[0029] Description of reference numerals:

[0030] 1. Support part; 2. Valve stem; 3. Position sensor; 4. Transmission part; 5. Hairspring; 6. Large gear; 7. First gear; 8. Second gear; 9. Third gear; 10. Magnet; 11. Support frame. Implementation

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] The present application discloses an angular travel actuator with high position detection accuracy. Figure 1 , Figure 2 and Figure 3, the angular stroke driver with high position detection accuracy includes a support part 1, which mainly plays a supporting role, and a device for operating the valve is arranged in the support part 1; a valve stem 2 is arranged on the support part 1, and the valve stem 2 is rotatably connected to the support part 1, that is, the valve stem 2 moves in an angular stroke, and the rotation of the valve stem 2 drives the valve to open and close; a large gear 6 is rotatably connected to the support part 1 through a rotating shaft, and the valve stem 2 is penetrated in the large gear 6 and fixed to the inner side wall of the large gear 6. The fixing method here can be bonding, clamping, threaded connection, etc. In this embodiment, the clamping fixing method is preferably adopted, and the rotation of the large gear 6 can drive the valve stem 2 to rotate, thereby completing the opening and closing of the valve, and a motor is fixed to the support part 1 by bolts, and a gear set is arranged on the support part 1. The gears in the gear set are respectively meshed with the motor shaft and the large gear 6, so that the rotation of the motor can drive the large gear 6 to rotate through the transmission of the gear set, thereby driving the valve stem 2 to rotate, and the large gear 6 is a fan-shaped gear, so that the rotation range of the large gear 6 is 0° to 90°, that is, the valve stem 2 moves in an angular stroke of 90°.

[0033] Reference Figure 1 , Figure 2 and Figure 3 A circuit board is provided on the support part 1 and a position sensor 3 is welded on the circuit board. The position sensor 3 is mainly used to detect the position signal of the valve stem 2. The position sensor 3 can be a potentiometer or a magnetic rotary encoder. In this embodiment, the position sensor 3 is a magnetic rotary encoder. A transmission part 4 is provided on the support part 1. The transmission part 4 can transmit the position signal of the valve stem 2 to the position sensor 3, which is convenient for the position detection process of the valve stem 2. The transmission part 4 includes a first gear 7 and a second gear 8; the first gear 7 is rotatably connected to the support part 1 through a rotating shaft, and the first gear 7 is fixed on the large gear 6 The end face, the fixing method here can be bonding, clamping, bolt connection, etc., in this embodiment, the clamping fixing method is preferably adopted, the diameter of the first gear 7 is smaller than the diameter of the large gear 6, and the valve stem 2 is inserted into the first gear 7, the rotation of the large gear 6 can drive the first gear 7 to rotate synchronously, the first gear 7 is a fan-shaped gear, and can move synchronously with the valve stem 2; the second gear 8 is rotatably connected to the support part 1 through the rotating shaft, and the second gear 8 is meshed with the first gear 7, the diameter of the second gear 8 is smaller than the diameter of the first gear 7, and the support part 1 is rotatably connected with a third gear 9 through the rotating shaft, and the third gear 9 is meshed with the second gear 8, At the same time, the shaft of the third gear 9 is vertically arranged, and the position of the shaft of the third gear 9 corresponds to the position of the position sensor 3. The end of the shaft of the third gear 9 is fixed with a magnet 10 by embedding, so the position of the magnet 10 corresponds to the position of the position sensor 3. When the valve stem 2 rotates, under the action of the transmission part 4, the magnet 10 rotates to transmit the position signal of the valve stem 2 to the position sensor 3; in addition, there is a certain gap between the magnet 10 and the position sensor 3, so the two will not contact, further reducing the influence of friction on the detection accuracy.

[0034] Reference Figure 1 , Figure 2 and Figure 3 A hairspring 5 is provided at the sensor. The hairspring 5 is mainly used to reduce the influence of the gear side clearance in the transmission part 4 on the gear transmission accuracy. A support frame 11 is fixed on the support part 1 by bolts. The rotating shaft of the third gear 9 is penetrated by the support frame 11. The support frame 11 is mainly used to support the hairspring 5. One end of the hairspring 5 is fixed to the side wall of the rotating shaft of the third gear 9, and the other end is fixed to the side wall of the support frame 11. During installation, a unidirectional rotational force is first applied to the hairspring 5. During the rotation angle of the magnet 10 less than 360°, this rotational force is always greater than the rotational resistance of the transmission part, so that the gears are in unidirectional contact and meshing. When the valve stem 2 runs with an angular stroke of 90°, the meshing side clearance of the gears will not affect the gear transmission accuracy, thereby not affecting the position detection accuracy of the driver.

[0035] The implementation principle of an angular stroke driver with high position detection accuracy in an embodiment of the present application is as follows: the motor is started to drive the large gear 6 to rotate, the large gear 6 drives the valve stem 2 to rotate, and at the same time drives the first gear 7 to rotate, the first gear 7 drives the second gear 8 and the third gear 9 to rotate, thereby driving the magnet 10 on the rotating shaft to move, and transmitting the position signal of the valve stem 2 to the position sensor 3. At the same time, since a hairspring 5 is fixed on the rotating shaft, the hairspring 5 will pre-apply a unidirectional rotational force before installation, thereby reducing the influence of the meshing side clearance of the gears on the gear transmission accuracy.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An angular stroke actuator with high position detection accuracy, characterized in that: It comprises a supporting part (1); A valve stem (2) is rotatably disposed on the support portion (1); A position sensor (3) is arranged on the support portion (1) and is used to detect a position signal of the valve stem (2); A transmission part (4) is arranged on the support part (1) and is used to transmit the position signal of the valve stem (2) to the position sensor (3); A hairspring (5) is arranged at the position sensor (3) and is used to reduce the backlash of the gears in the transmission part (4).

2. The angular stroke actuator with high position detection accuracy according to claim 1, characterized in that: The support portion (1) is rotatably connected to a large gear (6) for driving the valve stem (2) to rotate, and the valve stem (2) is inserted through the large gear (6).

3. The angular stroke actuator with high position detection accuracy according to claim 2, characterized in that: The large gear (6) is a sector gear.

4. The angular stroke actuator with high position detection accuracy according to claim 2, characterized in that: The transmission part (4) comprises a first gear (7) rotatably arranged on the support part (1), the first gear (7) being fixed to the end face of the large gear (6), a second gear (8) rotatably connected to the support part (1) and meshing with the first gear (7), a third gear (9) rotatably connected to the support part (1) and meshing with the second gear (8), the rotation shaft position of the third gear (9) corresponding to the position of the position sensor (3).

5. The angular stroke actuator with high position detection accuracy according to claim 4, characterized in that: The first gear (7) is a sector gear.

6. The angular stroke actuator with high position detection accuracy according to claim 4, characterized in that: The position sensor (3) is a magnetic rotary encoder, and a magnet (10) is fixed to the end of the rotating shaft of the third gear (9).

7. The angular stroke actuator with high position detection accuracy according to claim 6, characterized in that: There is a certain distance between the magnet (10) and the position sensor (3).

8. The angular stroke actuator with high position detection accuracy according to claim 4, characterized in that: A support frame (11) is fixed on the support portion (1), a rotating shaft of the third gear (9) is passed through the support frame (11), one end of the hairspring (5) is fixed to a side wall of the rotating shaft of the third gear (9), and the other end is fixed to a side wall of the support frame (11).

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