Novel pneumatic stepping actuator

Abstract

The utility model relates to the technical field of pneumatic actuators, in particular to a novel pneumatic stepping actuator which comprises a pneumatic driving mechanism and a transmission mechanism, the pneumatic driving mechanism comprises an air cylinder, the transmission mechanism comprises a box body, and a box cover is arranged on the top of the box body. When the pneumatic driving mechanism works, the pneumatic driving mechanism is connected with a valve core of the 24-way rotary valve through the transmission mechanism, the piston rod of the air cylinder moves to drive the shifting fork to move, and then the ratchet wheel, the pawl disc, the sun wheel planet wheel, the wheel carrier and the output shaft are driven to rotate and output to the connected 24-way rotary valve. The reciprocating motion of the piston of the air cylinder can be converted into the rotary motion of the valve core so as to realize the on-off switching of 24 valve ports, so that the novel pneumatic stepping actuator is formed, the structure is simple, the size is small, a hydraulic device is omitted, all possible faults from the hydraulic device are avoided, the fault rate is reduced, and the working efficiency is improved. And the working stability and reliability of the pneumatic actuator are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic actuator technical field, concretely is a novel pneumatic stepping actuator. BACKGROUND

[0002] Pneumatic actuator is a kind of device using compressed air as power source, and air pressure energy is converted into mechanical movement, is widely used in industrial automation control system, is used to drive valve, mechanical arm, conveying device and other equipment, its core feature is to realize quick, reliable linear or rotary motion by air pressure change;

[0003] Twenty-four-way rotary valve needs to use pneumatic actuator when working, currently, twenty-four-way rotary valve tradition all adopts hydraulic drive mode, device is generally equipped with a set of independent small-sized hydraulic device (HPU) and an independent control unit, the operating cycle of rotary valve is designed according to five-year overhaul window, in the use process, pipeline / cylinder leaks oil, leaks air (accumulator), valve failure, pressure instability, oil passage blockage and multiple faults are not periodic when not full cycle, so how to effectively reduce failure rate, improve the stability and reliability of pneumatic actuator work, is one of the problems needing to be solved in the working process of current pneumatic actuator, for this purpose, a novel pneumatic stepping actuator is proposed. SUMMARY

[0004] The utility model aims at providing a novel pneumatic stepping actuator to solve the problems in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a novel pneumatic stepping actuator, including pneumatic drive mechanism and transmission mechanism, the pneumatic drive mechanism includes cylinder, the transmission mechanism includes box, the top of box is equipped with box cover, the outer lateral wall of box is installed to the cylinder, the piston rod end of cylinder extends into the inside of box and is connected with fork, one end of fork is connected with ratchet wheel, the inner lateral wall of ratchet wheel is connected with pawl disc, the outer lateral wall of pawl disc is connected with connecting shaft, one end of connecting shaft is fixedly connected with sun gear, the outer lateral wall of sun gear is connected with planetary gear, the outer lateral wall of planetary gear is connected with wheel carrier, one end of wheel carrier is connected with output shaft, the bottom of box is equipped with upper cover, the bottom of upper cover is equipped with lower cover.

[0006] As further preferred of the technical scheme: the number of cylinder is four, the inner lateral wall of cylinder is slidably connected with piston, one side of piston is equipped with piston rod, and the outer lateral wall of cylinder is respectively equipped with air inlet and air outlet.

[0007] As a further preferred embodiment of this technical solution: a feedback bracket is installed on the top of the box cover, a digital display is provided inside the feedback bracket, a switch box is provided on the top of the feedback bracket, a proximity switch base is installed inside the switch box, and a feedback rod is provided on the outer wall of the proximity switch base.

[0008] As a further preferred embodiment of this technical solution: the top of the switch box is screwed with a reverse-mounted rear cover.

[0009] As a further preferred embodiment of this technical solution: the housing, the cover, the switch box, the rear cover, the top cover, and the bottom cover are all made of high-strength metal materials.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] In operation, the pneumatic drive mechanism of this invention is connected to the valve core of a 24-way rotary valve via a transmission mechanism. The piston rod of the cylinder moves, driving the fork to move, which in turn drives the ratchet, pawl disc, sun gear, planetary gears, wheel carrier, and output shaft to rotate, outputting to the connected 24-way rotary valve. This allows the reciprocating motion of the cylinder piston to be converted into the rotational motion of the valve core, thereby achieving the on / off switching of the 24 valve ports. This constitutes a novel pneumatic stepper actuator with a simple structure, small size, and eliminates the need for a hydraulic device, avoiding all possible failures from hydraulic devices, reducing the failure rate, and improving the stability and reliability of the pneumatic actuator. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0013] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0014] Figure 3 This is a schematic diagram of the cylinder structure in this utility model;

[0015] Figure 4 This is a schematic diagram of the right-side structure of this utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the planetary gear and the sun gear in this utility model;

[0017] Figure 6 This is a schematic diagram of the transmission mechanism in this utility model;

[0018] Figure 7 This is a schematic diagram of the pneumatic drive mechanism in this utility model.

[0019] In the picture:

[0020] 1. Pneumatic drive mechanism; 2. Transmission mechanism; 3. Housing; 4. Shift fork; 5. Cylinder; 6. Piston; 7. Housing cover; 8. Feedback bracket; 9. Digital display; 10. Switch box; 11. Proximity switch base; 12. Feedback rod; 13. Reverse upper cover; 14. Pawl disc; 15. Ratchet; 16. Upper cover; 17. Planetary gear; 18. Sun gear; 19. Lower cover; 20. Output shaft; 21. Wheel carrier. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "equipment" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] Please see Figures 1-7 This utility model provides a technical solution: a novel pneumatic stepper actuator, including a pneumatic drive mechanism 1 and a transmission mechanism 2. The pneumatic drive mechanism 1 includes a cylinder 5, and the transmission mechanism 2 includes a housing 3. The top of the housing 3 is provided with a housing cover 7. The cylinder 5 is installed on the outer side wall of the housing 3. The piston rod end of the cylinder 5 extends into the housing 3 and is connected to a shift fork 4. One end of the shift fork 4 is connected to a ratchet 15. The inner side wall of the ratchet 15 is connected to a pawl disc 14. The outer side wall of the pawl disc 14 is connected to a connecting shaft. One end of the connecting shaft is fixedly connected to a sun gear 18. The outer side wall of the sun gear 18 is connected to a planet gear 17. The outer side wall of the planet gear 17 is connected to a wheel frame 21. One end of the wheel frame 21 is connected to an output shaft 20. The bottom of the housing 3 is provided with an upper cover 16, and the bottom of the upper cover 16 is provided with a lower cover 19.

[0024] In the above configuration, the pneumatic drive mechanism 1 is connected to the valve core of the 24-way rotary valve through the transmission mechanism 2. The piston rod of the cylinder 5 moves to drive the shift fork 4, which in turn drives the ratchet 15, pawl disc 14, sun gear 18, planetary gear 17, wheel frame 21 and output shaft 20 to rotate, and output to the connected 24-way rotary valve. This allows the reciprocating motion of the piston 6 of the cylinder 5 to be converted into the rotational motion of the valve core to achieve the on / off switching of the 24 valve ports, thus forming a new type of pneumatic stepper actuator. It has a simple structure, small size, eliminates the hydraulic device, avoids all possible failures from the hydraulic device, reduces the failure rate, and improves the stability and reliability of the pneumatic actuator.

[0025] In this specific example: there are four cylinders 5. A piston 6 is slidably connected to the inner wall of each cylinder 5. A piston rod is located on one side of the piston 6. An air inlet and an air outlet are located on the outer wall of each cylinder 5. The four-cylinder configuration enables online cylinder-off maintenance. After cylinder-off, both ends of each cylinder 5 are open to the atmosphere. Cleaning oil or grease is injected through the upper port. The cylinder wall is cleaned and lubricated as the piston 6 moves left and right. Dirt and excess oil can be discharged through the lower drain port. Each cylinder 5 is equipped with two independent air source interfaces, allowing the piston 6 to reciprocate within the cylinder 5. With eight independent air source interfaces, the exhaust volume of each cylinder is reduced. The pneumatic control valve uses a small diameter to reduce noise. The 70-degree angle stroke is designed to reduce the excessive stroke of conventional 90-degree cylinders 5. By adopting eight independent air source interfaces and small-diameter pneumatic control valves, noise is reduced. The improved mechanical transmission chain, such as the front ratchet mechanism, improves positioning accuracy and reduces gear errors.

[0026] In this specific example: a feedback bracket 8 is installed on the top of the cover 7, a digital display 9 is installed inside the feedback bracket 8, a switch box 10 is installed on the top of the feedback bracket 8, a proximity switch seat 11 is installed inside the switch box 10, and a feedback rod 12 is installed on the outer wall of the proximity switch seat 11; the pneumatic stepper actuator is controlled by a programmable logic controller (PLC) to control the gas inlet and outlet of the cylinder 5, thereby precisely controlling the stroke and speed of the piston 6, so as to achieve precise control of the rotation angle and speed of the 24-way rotary valve core. The programmable logic controller (PLC) has a pre-programmed control algorithm, which sets different piston 6 movement modes according to the working requirements of the 24-way rotary valve to achieve a variety of different 24-way valve port on / off combinations.

[0027] In this specific example: the top screw of the switch box 10 is connected to the reverse back cover 13.

[0028] In this specific example, the housing 3, housing cover 7, switch box 10, upper rear cover 13, upper cover 16, and lower cover 19 are all made of high-strength metal materials; the high-strength metal material is duplex stainless steel UNSS31803, which is used to improve the structural strength and corrosion resistance of the actuator body.

[0029] The working principle of this utility model is as follows: A four-cylinder configuration (5) enables online cylinder-off maintenance. After cylinder-off, both ends of cylinder 5 are open to the atmosphere. Cleaning oil or grease is injected through the upper port, cleaning and lubricating the cylinder wall during the left-right movement of the piston (6). Dirt and excess oil can be discharged through the lower drain port. Each cylinder 5 is equipped with two independent air source interfaces, allowing the piston (6) to reciprocate within the cylinder 5. The use of eight independent air source interfaces reduces the exhaust volume of each cylinder. The small-diameter pneumatic control valve reduces noise. A 70-degree angle stroke is designed to address the excessive stroke of conventional 90-degree cylinders (5). Noise is reduced through the use of eight independent air source interfaces, small-diameter pneumatic control valves, and a front-mounted ratchet mechanism. The improved mechanical transmission chain enhances positioning accuracy and reduces gear errors. The pneumatic drive mechanism 1 is connected to the valve core of the 24-way rotary valve via the transmission mechanism 2. The piston rod of cylinder 5 drives the fork 4, which in turn drives the ratchet 15, pawl disc 14, sun gear 18, planetary gear 17, wheel frame 21, and output shaft 20 to rotate, outputting to the connected 24-way rotary valve. This allows the reciprocating motion of the piston 6 in cylinder 5 to be converted into the rotational motion of the valve core, enabling the switching of the 24 valve ports. This constitutes a new type of pneumatic stepper actuator with a simple structure, small size, and eliminates the need for a hydraulic device, avoiding all possible failures from hydraulic devices, reducing the failure rate, and improving the stability and reliability of the pneumatic actuator.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel pneumatic stepper actuator, characterized in that: The device includes a pneumatic drive mechanism (1) and a transmission mechanism (2). The pneumatic drive mechanism (1) includes a cylinder (5), and the transmission mechanism (2) includes a housing (3). The top of the housing (3) is provided with a housing cover (7). The cylinder (5) is installed on the outer side wall of the housing (3). The piston rod end of the cylinder (5) extends into the interior of the housing (3) and is connected to a shift fork (4). One end of the shift fork (4) is connected to a ratchet (15). The inner side of the ratchet (15) A ratchet disc (14) is connected to the wall. A connecting shaft is connected to the outer wall of the ratchet disc (14). A sun gear (18) is fixedly connected to one end of the connecting shaft. A planet gear (17) is connected to the outer wall of the sun gear (18). A wheel carrier (21) is connected to the outer wall of the planet gear (17). An output shaft (20) is connected to one end of the wheel carrier (21). A top cover (16) is provided at the bottom of the housing (3). A bottom cover (19) is provided at the bottom of the top cover (16).

2. The novel pneumatic stepper actuator according to claim 1, characterized in that: The number of cylinders (5) is four. A piston (6) is slidably connected to the inner wall of the cylinder (5). A piston rod is provided on one side of the piston (6). An air inlet and an air outlet are respectively provided on the outer wall of the cylinder (5).

3. The novel pneumatic stepper actuator according to claim 2, characterized in that: A feedback bracket (8) is installed on the top of the cover (7). A digital display (9) is provided inside the feedback bracket (8). A switch box (10) is provided on the top of the feedback bracket (8). A proximity switch base (11) is installed inside the switch box (10). A feedback rod (12) is provided on the outer wall of the proximity switch base (11).

4. The novel pneumatic stepper actuator according to claim 3, characterized in that: The top of the switch box (10) is screwed to a reverse-mounted rear cover (13).

5. The novel pneumatic stepper actuator according to claim 4, characterized in that: The housing (3), the cover (7), the switch box (10), the rear cover (13), the upper cover (16), and the lower cover (19) are all made of high-strength metal materials.

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