Built-in motion feedback device of actuating mechanism

Abstract

The utility model relates to a built-in action feedback device of an actuating mechanism, which comprises a cylinder body, a gear box and a push rod, an upper end cover is arranged at the upper end of the cylinder body, and a lower end cover is arranged at the lower end of the cylinder body; a piston is arranged in the cylinder body in a sliding manner, and a mounting hole is formed in the piston; the gear box is fixedly installed on the upper end cover, a transmission rod extending into the cylinder body is rotationally arranged in the middle of the gear box, a feedback shaft is arranged on one side of the gear box, and a transmission gear set is arranged between the transmission rod and the feedback shaft. A series of parts are driven to conduct transmission through reciprocating motion of the piston of the air cylinder, finally motion of the feedback shaft is captured through the motion sensor, the motion position of the air cylinder is measured, no additional power source is needed, and the device is economical, environmentally friendly, free of pollution, anti-explosion, small in installation space and high in environment adaptability. The transmission rod in a spiral spline form enables transmission to be accurate, so that the feedback shaft acts more accurately, and the full-stroke position feedback of the air cylinder piston can be met.

Description

Technical Field

[0001] This utility model belongs to the field of instrumentation technology and relates to an actuator with built-in motion feedback device. Background Technology

[0002] Pneumatic actuators, as safe, environmentally friendly, and efficient drive devices, are widely used in the pneumatic control of various valves and are extensively applied in industries such as petrochemicals, coal chemicals, and steel smelting. Due to their inherently safe and reliable structure and power source, they can be used in some special areas, such as the bottom of reactors and the base of storage tanks, providing effective explosion protection. However, these areas are often confined spaces and prone to significant heat transfer, greatly impacting the structural design of the installation location of pneumatic actuators and their accessories, especially the installation of position feedback. Current technology generally uses two-sided feedback push rod assemblies to achieve switch position feedback. This technology can only reflect the fully open and fully closed positions of the valve, not every position within the 0-100% stroke, and cannot feed each position back to the feedback module or positioner, thus failing to meet the requirements of a true control valve. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a built-in motion feedback device for actuators.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0005] An actuator-embedded motion feedback device includes:

[0006] A cylinder body, with an upper end cap at the upper end and a lower end cap at the lower end; a piston is slidably disposed inside the cylinder body, and the piston has an installation hole.

[0007] The gearbox is fixedly installed on the top of the upper cover. A transmission rod extending into the cylinder body is rotatably provided in the middle of the gearbox. A feedback shaft is provided on one side of the gearbox. A transmission gear set is provided between the transmission rod and the feedback shaft.

[0008] A push rod is fixedly installed in a mounting hole. The upper end of the push rod has a connecting hole. A spiral sleeve that can cooperate with the transmission rod is screwed into the connecting hole. The inner hole of the spiral sleeve is a spiral spline hole. The rod part of the transmission rod is provided with spiral spline teeth that can cooperate with the inner hole of the spiral sleeve.

[0009] A motion sensor is fixedly mounted on the top of the gearbox, and the sensor's probe can cooperate with the feedback shaft.

[0010] Preferably, the gearbox is connected to the upper end cover using connecting bolts.

[0011] Preferably, the upper end cover and the lower end cover of the cylinder are connected by long bolts.

[0012] Preferably, a positioning step is provided on the lower inner sidewall of the mounting hole; a first pair of open rings that can cooperate with the positioning step are provided on the push rod; a positioning ring is provided at the upper end of the push rod, and a second pair of open rings are provided between the push rod and the positioning ring.

[0013] Preferably, the push rod is provided with a retaining ring for fixing the positioning ring.

[0014] Preferably, a fixed bracket is provided on the top of the gearbox, and the motion sensor is connected to the gearbox via the fixed bracket;

[0015] Preferably, the upper end of the feedback shaft is provided with a slot that can cooperate with the sensor probe.

[0016] Preferably, a first sealing ring is provided between the push rod and the piston, and a second sealing ring is provided between the piston and the cylinder.

[0017] Preferably, the driving gear of the transmission gear set is mounted on the upper end of the transmission rod, and the final stage gear of the transmission gear set is mounted on the rod part of the feedback shaft.

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] This invention uses the reciprocating motion of a cylinder piston to drive a series of parts for transmission. Finally, the motion sensor captures the motion of the feedback shaft and determines the position of the cylinder. No external power source is required, making it economical, environmentally friendly, pollution-free, explosion-proof, and requiring little installation space, with strong environmental adaptability. The spiral spline type transmission rod ensures precise transmission, thereby making the motion of the feedback shaft more accurate and meeting the full stroke position feedback of the cylinder piston. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the transmission rod structure of this utility model.

[0022] Figure 3 This is a schematic diagram of the piston part of this utility model.

[0023] In the diagram: 1. Cylinder body; 2. Upper end cover; 3. Lower end cover; 4. Mounting hole; 5. Gearbox; 6. Transmission rod; 7. Transmission gear set; 8. Push rod; 9. Connecting hole; 10. Helical bushing; 11. Helical spline teeth; 12. Connecting bolt; 13. Long rod bolt; 15. Positioning step; 16. First split ring; 17. Positioning ring; 18. Second split ring; 19. Snap ring; 20. Fixed bracket; 21. Motion sensor; 22. Slot; 23. First sealing ring; 24. Second sealing ring; 25. Drive gear; 26. Final stage gear; 27. Piston; 28. Feedback shaft; 29. ​​Probe head. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0025] This embodiment proposes an actuator with built-in motion feedback device, including a cylinder body 1, a gearbox 5 and a push rod 8. The cylinder body 1 is connected to the outer shell of the external cylinder actuator, and the lower end of the push rod 8 is connected to the internal piston of the external cylinder.

[0026] like Figures 1-3 As shown, the upper end of the cylinder body 1 is provided with an upper end cover 2, and the lower end of the cylinder body 1 is provided with a lower end cover 3; the cylinder body 1, the upper end cover 2 and the lower end cover 3 form a sealed chamber.

[0027] A piston 27 is slidably disposed inside the cylinder body 1, and the piston 27 is provided with a mounting hole 4;

[0028] The gearbox 5 is fixedly installed on the top of the upper end cover 2. A transmission rod 6 extending into the cylinder body 1 is rotatably provided in the middle of the gearbox 5. A feedback shaft 28 is provided on one side of the gearbox 5. A transmission gear set 7 is provided between the transmission rod 6 and the feedback shaft 28. When the piston of the external cylinder moves, the piston 27 moves up and down in the cylinder body 1 through the push rod 8. The piston 27 guides the push rod 8.

[0029] The push rod 8 is fixedly installed in the mounting hole 4. The upper end of the push rod 8 is provided with a connecting hole 9. A spiral sleeve 10 that can cooperate with the transmission rod 6 is screwed into the connecting hole 9. When the push rod 8 moves up and down, it drives the spiral sleeve 10 to move up and down. When the spiral sleeve 10 moves, it will cause the transmission rod 6 to rotate. The transmission rod 6 drives the feedback shaft 28 to rotate through the transmission gear set 7.

[0030] The inner hole of the spiral bushing 10 is a spiral spline hole, and the rod part of the transmission rod 6 is provided with spiral spline teeth 11 that can cooperate with the inner hole of the spiral bushing 10.

[0031] Motion sensor 21 is fixedly installed on the gearbox 5. The probe 29 of motion sensor 21 can cooperate with feedback shaft 28. When feedback shaft 28 rotates, it drives probe 29 to move. Motion sensor 21 receives signals and can transmit them to signal processing device (such as PLC).

[0032] Furthermore, the gearbox 5 is connected to the upper end cover 2 by connecting bolts 12, and the bolt connection facilitates the installation and fixation of the gearbox 5.

[0033] Furthermore, the upper end cover 2 and the lower end cover 3 of the cylinder body 1 are connected by a long bolt 13, which makes the connection between the upper end cover 2, the lower end cover 3 and the cylinder body 1 firm.

[0034] Furthermore, a positioning step 15 is provided on the lower inner wall of the mounting hole 4, and a first pair of open rings 16 that can cooperate with the positioning step 15 are provided on the push rod 8; a positioning ring 17 is provided on the upper end of the push rod 8, and a second pair of open rings 18 are provided between the push rod 8 and the positioning ring 17. The push rod 8 is axially limited with the piston 27 by means of the first pair of open rings 16 and the second pair of open rings 18.

[0035] Furthermore, the push rod 8 is provided with a retaining ring 19 for fixing the positioning ring 17. The positioning ring 17 is used to fix the second pair of open rings 18, and the retaining ring 19 prevents the positioning ring 17 from moving axially.

[0036] Furthermore, a fixed bracket 20 is provided on the top of the gearbox 5, and the motion sensor 21 is connected to the gearbox 5 via the fixed bracket 20.

[0037] Furthermore, the upper end of the feedback shaft 28 is provided with a slot 22 that can cooperate with the probe head 29, and the slot 22 facilitates the assembly and cooperation of the feedback shaft 28 and the probe head 29.

[0038] Furthermore, a first sealing ring 23 is provided between the push rod 8 and the piston 27, and a second sealing ring 24 is provided between the piston 27 and the cylinder 1.

[0039] Furthermore, the driving gear 25 of the transmission gear set 7 is mounted on the upper end of the transmission rod 6, and the final gear 26 of the transmission gear set 7 is mounted on the rod part of the feedback shaft 28.

[0040] Working Principle: This novel utility model utilizes a helical sleeve 10 mounted on the push rod 8. Through the cooperation of the helical sleeve 10 with the transmission rod 6 and the transmission gear set, the axial movement of the push rod 8 is converted into the rotation of the feedback shaft 28. The upper end of the feedback shaft 28 is connected to the probe of the motion sensor. When the feedback shaft 28 rotates, the motion sensor 21 can detect each angle of rotation of the feedback shaft 28, thereby measuring the amplitude of the cylinder piston's movement. The inner hole of the helical sleeve 10 is a helical spline hole, and the rod portion of the transmission rod 6 is provided with helical spline teeth 11 that can cooperate with the inner hole of the helical sleeve 10. The cooperation between the inner hole of the helical sleeve 10 (helical spline hole type) and the transmission rod 6 (helical spline tooth type) results in precise transmission.

[0041] It is understood that the above embodiments are merely exemplary models used to illustrate the principles of this utility model, and this utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A motion feedback device built into an actuator, characterized in that, The utility model relates to a kind of piston driving device, including: Cylinder (1), the upper end of the cylinder (1) is provided with upper end cover (2), the lower end of the cylinder (1) is provided with lower end cover (3);The inside of cylinder (1) is slidably provided with piston (27), and the installation hole (4) is formed in the piston (27); Gear box (5), the gear box (5) is fixedly installed on the upper face of upper end cover (2), the middle part of gear box (5) is rotatably provided with transmission rod (6) that extends into the inside of cylinder (1), one side of gear box (5) is provided with feedback shaft (28), and transmission gear set (7) is arranged between transmission rod (6) and feedback shaft (28); Push rod (8), the push rod (8) is fixedly installed in installation hole (4), the upper end of push rod (8) is provided with connecting hole (9), and screw shaft sleeve (10) capable of being matched with transmission rod (6) is screwed in connecting hole (9), the inner hole of the screw shaft sleeve (10) is spiral spline hole, and the rod portion of transmission rod (6) is provided with spiral spline tooth (11) capable of being matched with the inner hole of screw shaft sleeve (10); Action sensor (21), the action sensor (21) is fixedly installed on the upper face of gear box (5), and the detection head (29) of action sensor (21) can be matched with feedback shaft (28).

2. The actuator built-in motion feedback device according to claim 1, wherein The gear box (5) is connected with the upper end cover (2) using connecting bolt (12).

3. The actuator built-in motion feedback device according to claim 1, wherein The upper end cover (2) and the lower end cover (3) are connected using long rod bolt (13).

4. The actuator built-in motion feedback device according to claim 1, wherein The lower end of the inner side wall of installation hole (4) is provided with positioning step (15);Push rod (8) is provided with first pair of open ring (16) capable of being matched with positioning step (15);The upper end of push rod (8) is provided with positioning ring (17), and second pair of open ring (18) is arranged between push rod (8) and positioning ring (17).

5. The actuator built-in motion feedback device according to claim 1, wherein The push rod (8) is provided with snap spring (19) for fixing positioning ring (17).

6. The actuator built-in motion feedback device according to claim 1, wherein The upper face of the gear box (5) is provided with fixed support (20), and the action sensor (21) is connected with the gear box (5) using fixed support (20).

7. The actuator built-in motion feedback device according to claim 1, wherein The upper end of feedback shaft (28) is provided with clamping groove (22) capable of being matched with detection head (29).

8. The actuator built-in motion feedback device according to claim 1, wherein First sealing ring (23) is arranged between the push rod (8) and piston (27), and second sealing ring (24) is arranged between piston (27) and cylinder (1).

9. The actuator built-in motion feedback device according to claim 1, wherein The driving gear (25) of transmission gear set (7) is sleeved on the upper end of transmission rod (6), and the last stage gear (26) of transmission gear set (7) is sleeved on the rod portion of feedback shaft (28).

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