Built-in motion feedback device of actuating mechanism

Abstract

The invention 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 the reciprocating motion of the piston of the air cylinder, finally the 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] The present invention belongs to the technical field of instruments and meters, and relates to an actuator built-in motion feedback device. Background Art

[0002] As a safe, environmentally friendly and efficient driving device, pneumatic actuators are widely used in the pneumatic control of various valves and are widely used in industries such as petrochemical, coal chemical, and iron and steel smelting. Due to the intrinsic safety and reliability of its structure and power source, it can be applied to some special areas, such as the bottom of the reactor and the root of the storage tank, and can play an effective explosion-proof role. However, the space in these areas is often relatively narrow and large heat transfer is likely to occur. The structural design of the installation position of the pneumatic actuator and its supporting accessories is greatly affected by this, especially the installation of the position feedback of the pneumatic actuator. The prior art generally uses two-side feedback push rod assemblies to realize the feedback of the on-off position. The prior art can only reflect the fully open and fully closed positions of the valve, cannot reflect each position in the 0-100% stroke, and cannot even feedback each position to the feedback module or the positioner, thus failing to meet the requirements of a true control valve. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides an actuator built-in motion feedback device.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows: An actuator built-in motion feedback device, comprising: A cylinder block, with an upper end cover provided at the upper end of the cylinder block and a lower end cover provided at the lower end of the cylinder block; a piston is slidably arranged inside the cylinder block, and an installation hole is provided on the piston; A gearbox, which is fixedly installed on the upper surface of the upper end cover. A transmission rod extending into the interior of the cylinder block is rotatably arranged in the middle of the gearbox. A feedback shaft is arranged on one side of the gearbox, and a transmission gear set is arranged between the transmission rod and the feedback shaft; A push rod, which is fixedly installed in the installation hole. A connection hole is provided at the upper end of the push rod, and a spiral shaft sleeve capable of cooperating with the transmission rod is screwed in the connection hole. The inner hole of the spiral shaft sleeve is a spiral spline hole, and a spiral spline tooth capable of cooperating with the inner hole of the spiral shaft sleeve is provided on the rod portion of the transmission rod; A motion sensor, which is fixedly installed on the upper surface of the gearbox, and the detection head of the motion sensor can cooperate with the feedback shaft.

[0005] Preferably, the gearbox is connected to the upper end cover by connecting bolts.

[0006] Preferably, the upper end cover and the lower end cover of the cylinder block are connected by long rod bolts.

[0007] Preferably, a positioning step is provided on the inner wall of the lower end of the mounting hole; a first split ring that can cooperate with the positioning step is provided on the push rod; a positioning ring is provided at the upper end of the push rod, and a second split ring is provided between the push rod and the positioning ring.

[0008] Preferably, a snap ring for fixing the positioning ring is provided on the push rod.

[0009] Preferably, a fixing bracket is provided on the upper surface of the gearbox, and the motion sensor is connected to the gearbox by using the fixing bracket; Preferably, a card slot that can cooperate with the sensor probe is provided at the upper end of the feedback shaft.

[0010] 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 block.

[0011] Preferably, the driving gear of the transmission gear set is sleeved on the upper end of the transmission rod, and the final gear of the transmission gear set is sleeved on the rod portion of the feedback shaft.

[0012] Compared with the prior art, the present invention has the following advantages: The present invention drives a series of parts through the reciprocating motion of the cylinder piston, and finally captures the motion of the feedback shaft through the motion sensor to measure the motion position of the cylinder. Without any external power source, it is economical, environmentally friendly and pollution-free, explosion-proof, and requires less installation space, and has strong environmental adaptability; the transmission rod in the form of spiral spline makes the transmission accurate, so that the motion of the feedback shaft is more accurate, and it can meet the full-stroke position feedback of the cylinder piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 is a schematic diagram of the structure of the transmission rod of the present invention.

[0015] Figure 3 is a schematic diagram of the structure of the piston part of the present invention.

[0016] In the figure: 1, cylinder block; 2, upper end cover; 3, lower end cover; 4, mounting hole; 5, gearbox; 6, transmission rod; 7, transmission gear set; 8, push rod; 9, connection hole; 10, spiral bushing; 11, spiral spline teeth; 12, connection bolt; 13, long rod bolt; 15, positioning step; 16, first split ring; 17, positioning ring; 18, second split ring; 19, snap ring; 20, fixing bracket; 21, motion sensor; 22, card slot; 23, first sealing ring; 24, second sealing ring; 25, driving gear; 26, final gear; 27, piston; 28, feedback shaft; 29, probe. DETAILED DESCRIPTION OF THE INVENTION

[0017] To enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0018] This embodiment provides an actuator built-in motion feedback device, which includes a cylinder block 1, a gearbox 5 and a push rod 8. The cylinder block 1 is connected to the housing of an external cylinder actuator, and the lower end of the push rod 8 is connected to the internal piston of the external cylinder. As Figures 1-3 shown, an upper end cover 2 is provided at the upper end of the cylinder block 1, and a lower end cover 3 is provided at the lower end of the cylinder block 1; the cylinder block 1, the upper end cover 2 and the lower end cover 3 form a sealed chamber. A piston 27 is slidably arranged inside the cylinder block 1, and a mounting hole 4 is provided on the piston 27. The gearbox 5 is fixedly installed on the upper surface of the upper end cover 2. A transmission rod 6 extending into the cylinder block 1 is rotatably arranged in the middle of the gearbox 5. A feedback shaft 28 is arranged on one side of the gearbox 5. A transmission gear set 7 is arranged between the transmission rod 6 and the feedback shaft 28; when the piston of the external cylinder moves, the piston 27 is driven to move up and down in the cylinder block 1 through the push rod 8, and the piston 27 plays a guiding role for the push rod 8. The push rod 8 is fixedly installed in the mounting hole 4. A connection hole 9 is provided at the upper end of the push rod 8, and a spiral shaft sleeve 10 that can cooperate with the transmission rod 6 is screwed in the connection hole 9. When the push rod 8 moves up and down, it drives the spiral shaft sleeve 10 to move up and down. When the spiral shaft sleeve 10 moves, it will cause the transmission rod 6 to rotate, and the transmission rod 6 drives the feedback shaft 28 to rotate through the transmission gear set 7. The inner hole of the spiral shaft sleeve 10 is a spiral spline hole, and a spiral spline tooth 11 that can cooperate with the inner hole of the spiral shaft sleeve 10 is provided on the rod portion of the transmission rod 6. An action sensor 21, the action sensor 21 is fixedly installed on the upper surface of the gearbox 5, and the detection head 29 of the action sensor 21 can cooperate with the feedback shaft 28. When the feedback shaft 28 rotates, it drives the detection head 29 to move. The action sensor 21 receives the signal and can transmit it to a signal processing device (such as a PLC).

[0019] Further, 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.

[0020] Further, the upper end cover 2 and the lower end cover 3 of the cylinder block 1 are connected by a long rod bolt 13, and the long rod bolt 13 makes the connection between the upper end cover 2, the lower end cover 3 and the cylinder block 1 firm.

[0021] Further, a positioning step 15 is provided on the inner wall of the lower end of the mounting hole 4, and a first split ring 16 capable of cooperating with the positioning step 15 is provided on the push rod 8; a positioning ring 17 is provided at the upper end of the push rod 8, and a second split ring 18 is provided between the push rod 8 and the positioning ring 17. The push rod 8 is axially limited with respect to the piston 27 by the first split ring 16 and the second split ring 18.

[0022] Further, a snap ring 19 for fixing the positioning ring 17 is provided on the push rod 8. The positioning ring 17 is used to fix the second split ring 18, and the snap ring 19 prevents the positioning ring 17 from axially moving.

[0023] Further, a fixing bracket 20 is provided on the upper surface of the gearbox 5, and the motion sensor 21 is connected to the gearbox 5 by means of the fixing bracket 20.

[0024] Further, a card slot 22 capable of cooperating with the detection head 29 is provided at the upper end of the feedback shaft 28. The card slot 22 facilitates the assembly and cooperation of the feedback shaft 28 and the detection head 29.

[0025] Further, 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 block 1.

[0026] Further, the driving gear 25 of the transmission gear set 7 is sleeved on the upper end of the transmission rod 6, and the final gear 26 of the transmission gear set 7 is sleeved on the rod portion of the feedback shaft 28.

[0027] Working principle: In this new type of use, by providing a spiral bushing 10 on the push rod 8, and utilizing the cooperation between the spiral bushing 10 and the transmission rod 6 as well as 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 detection head of the motion sensor. When the feedback shaft 28 rotates, the motion sensor 21 can detect each angle of the rotation of the feedback shaft 28, thereby measuring the movement amplitude of the cylinder piston. The inner hole of the spiral bushing 10 is a spiral spline hole, and the rod portion of the transmission rod 6 is provided with spiral spline teeth 11 capable of cooperating with the inner hole of the spiral bushing 10. The inner hole of the spiral bushing 10 in the form of a spiral spline hole cooperates with the transmission rod 6 in the form of a spiral spline tooth rod, and the transmission effect is precise.

[0028] It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principle of the present invention, and the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. An actuator built-in action feedback device, characterized in that: include: A cylinder body (1), wherein an upper end cover (2) is provided at the upper end of the cylinder body (1), and a lower end cover (3) is provided at the lower end of the cylinder body (1); a piston (27) is slidably provided inside the cylinder body (1), and a mounting hole (4) is provided on the piston (27); A gear box (5), the gear box (5) being fixedly mounted on the upper end cover (2), a transmission rod (6) rotatably arranged in the middle of the gear box (5) and extending into the cylinder body (1), a feedback shaft (28) being arranged on one side of the gear box (5), and a transmission gear set (7) being arranged between the transmission rod (6) and the feedback shaft (28); A push rod (8), the push rod (8) being fixedly mounted in the mounting hole (4), a connecting hole (9) being formed at the upper end of the push rod (8), a spiral sleeve (10) being threadedly connected in the connecting hole (9) and being capable of cooperating with the transmission rod (6), the inner hole of the spiral sleeve (10) being a spiral spline hole, and the rod portion of the transmission rod (6) being provided with spiral spline teeth (11) capable of cooperating with the inner hole of the spiral sleeve (10); A motion sensor (21), wherein the motion sensor (21) is fixedly mounted on the gear box (5), and a detection head (29) of the motion sensor (21) can cooperate with a feedback shaft (28).

2. The built-in action feedback device of an actuator according to claim 1, characterized in that: The gear box (5) is connected to the upper end cover (2) by means of connecting bolts (12).

3. The built-in action feedback device of an actuator according to claim 1, characterized in that: The upper end cover (2) and the lower end cover (3) are connected by means of long-rod bolts (13).

4. The built-in action feedback device of an actuator according to claim 1, characterized in that: A positioning step (15) is provided on the inner side wall of the lower end of the mounting hole (4); a first pair of open rings (16) capable of matching with the positioning step (15) is provided on the push rod (8); a positioning ring (17) is provided at the upper end of the push rod (8), and a second pair of open rings (18) is provided between the push rod (8) and the positioning ring (17).

5. The built-in action feedback device of an actuator according to claim 1, characterized in that: The push rod (8) is provided with a retaining spring (19) for fixing the positioning ring (17).

6. The built-in action feedback device of an actuator according to claim 1, characterized in that: A fixed bracket (20) is arranged on the upper surface of the gear box (5), and the motion sensor (21) is connected to the gear box (5) by means of the fixed bracket (20).

7. The built-in action feedback device of an actuator according to claim 1, characterized in that: The upper end of the feedback shaft (28) is provided with a slot (22) capable of cooperating with the detection head (29).

8. The built-in action feedback device of an actuator according to claim 1, characterized in that: 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 body (1).

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

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