Manual-automatic integrated straight-stroke double-piston actuating mechanism

Abstract

The utility model discloses a manual-automatic integrated straight stroke double-piston type actuating mechanism, which comprises a switching device, a manual driving device, a pneumatic driving device and a central screw rod, the switching device is provided with a gear shifting handle, an eight-diagram wheel, a split nut and a connecting sleeve, the bottom surface of the eight-diagram wheel is provided with an eight-diagram arc-shaped groove, and the eight-diagram arc-shaped groove is close to the center from the periphery and is arc-shaped. The center lead screw penetrates between the split nuts, the top faces of the split nuts are provided with pin shafts, and the pin shafts are arranged in the eight-diagram arc-shaped grooves and can move along the tracks of the grooves, so that the split nuts get close to or leave the center lead screw in the radial direction of the connecting sleeve, and threaded connection is formed when the split nuts get close to the center lead screw. The split nut is installed in the connecting sleeve and can move in the radial direction, and the connecting sleeve is in key connection with the manual driving device, can drive the connecting sleeve to rotate and is in circumferential linkage with the split nut. The eight-diagram wheel is driven to rotate through the gear shifting handle, the split nut and the center lead screw are connected or separated by guiding the pin shaft through the arc-shaped groove, switching is simple and smooth, the manual mode can be rapidly switched, it is ensured that the valve is controlled timely and accurately, and the requirements of different working conditions are met.

Description

Technical Field

[0001] The utility model relates to the technical field of actuators, in particular to a manual-automatic integrated straight-stroke double-piston actuator. Background Art

[0002] Actuators play a crucial role in industrial automation and control. Traditional linear actuators are generally categorized as manual and automatic. However, in practical applications, both types of actuators often have shortcomings. Manual actuators require direct human intervention, making operation cumbersome and labor-intensive, making them difficult to meet the demands of efficient automated production. While automatic actuators can achieve automated control, they may not function properly in certain circumstances, such as power failures, control system failures, or when precise fine-tuning is required.

[0003] Furthermore, some existing actuators capable of manual and automatic switching have complex switching mechanisms, which not only increase manufacturing costs and maintenance difficulties but also can lead to higher failure rates. This creates numerous inconveniences for industrial production and limits the flexible application of actuators in different scenarios.

[0004] In industrial production, valve control is crucial for regulating fluid parameters such as flow and pressure. Currently, many valve controls rely on actuators. However, existing actuators often fail to meet practical requirements when controlling valve movement. When emergency valve operations or fine-tuning under specific operating conditions are required, traditional actuators may not respond quickly and accurately. Summary of the Invention

[0005] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides a manual-automatic integrated straight-stroke double-piston actuator, which can quickly and easily switch between manual and automatic modes, and the manual-automatic switching device has a simple structure to improve the reliability and applicability of the actuator.

[0006] The technical solution of the utility model includes a switching device, a manual driving device, a pneumatic driving device and a center screw rod. The center screw rod is connected to the pneumatic driving device to drive the center screw rod to rise and fall axially through the pneumatic driving device. The switching device includes a shift handle, a Bagua wheel, a split nut and a connecting sleeve. The shift handle is fixedly connected to the outer periphery of the Bagua wheel. The bottom surface of the Bagua wheel is provided with a Bagua arc groove. The Bagua arc groove gradually approaches the center of the Bagua wheel from the outer periphery of the Bagua wheel and is in an arc shape. The center screw rod penetrates between the split nuts, and the split nuts are A pin is fixed on the top surface, and the pin is movably placed in the Bagua arc groove and shifts according to the groove trajectory of the Bagua arc groove to drive the split nut to approach or leave the center screw rod along the radial direction of the connecting sleeve. The split nut forms a threaded connection with the center screw rod when it is close to the center screw rod; the split nut is also installed in the connecting sleeve and can be shifted along the radial direction of the connecting sleeve. The connecting sleeve is key-connected to the manual drive device to drive the connecting sleeve to rotate through the manual drive device. The connecting sleeve and the split nut form a linkage connection in the circumferential direction to drive the split nut to rotate.

[0007] By adopting the above technical solution, when emergency operation or fine-tuning is required under specific working conditions, the handle is turned to drive the Bagua wheel to rotate. As the Bagua wheel rotates, the shape of the Bagua arc groove guides the pin shaft to drive the split nut along the radial direction of the connecting sleeve to approach the center screw rod, and the split nut and the center screw rod can form a threaded connection. Afterwards, the manual drive device drives the connecting sleeve to rotate through the key connection, and then drives the center screw rod to move axially, thereby realizing manual control of the valve action; in this way, the Bagua wheel is driven to rotate by the shift handle, and the special shape of the Bagua arc groove is used to guide the movement of the pin shaft, thereby realizing the connection or separation of the split nut and the center screw rod. The entire switching process is simple and smooth. It is only necessary to quickly switch to manual mode through the handle to ensure the timeliness and accuracy of valve control, and it can quickly switch between manual and automatic modes to meet the needs of different working conditions; compared with the complex actuator structure of the existing manual-automatic switching device, the utility model has a simple structure and reduces the probability of failure.

[0008] In one possible design, the pneumatic drive device includes a piston cylinder with two piston chambers. A piston disc is movably mounted in each piston chamber. The centers of the two piston discs are linked by a piston rod, which is connected to the center screw rod.

[0009] The above design allows the dual-piston structure to generate greater thrust under the same air pressure conditions compared to a single-piston structure, helping to reduce component wear and deflection caused by excessive force on one side, thereby improving the stability of the entire actuator during the axial movement of the center screw and ensuring smooth valve movement.

[0010] In one possible design, the end of the piston rod is fixedly connected to a connecting head, a T-shaped hole is provided in the connecting head, a T-shaped slot is provided on the radial side of the T-shaped hole, and the bottom end of the center screw has a T-shaped rod head, which is inserted into the T-shaped hole from the T-shaped slot so as to be connected to the connecting head only for relative rotation.

[0011] With the above design, the T-shaped structure can effectively prevent the center screw from detaching from the connector in the axial direction, ensuring that the piston rod can stably transmit power to the center screw during pneumatic drive. At the same time, this connection method is more convenient to assemble.

[0012] In one possible design, the manual drive device includes a handwheel, a bevel gear shaft, a driven bevel gear, a pushed inner ring and a gear sleeve. The handwheel is fixedly connected to the bevel gear shaft, the bevel gear shaft is meshed with the driven bevel gear, the inner periphery of the driven bevel gear is convexly provided with a push platform protrusion, the outer periphery of the pushed inner ring is provided with a push groove, the push platform protrusion is placed in the push groove and is set against the groove wall of the push groove, the pushed inner ring is meshed with the gear sleeve inside and outside, and the gear sleeve is keyed to the connecting sleeve.

[0013] With the above design, the various components of the entire manual drive device work closely together, and the power transmission link from the handwheel to the connecting sleeve is relatively stable and reliable, forming a multi-stage transmission mode, which makes the power transmission more stable and smooth. Each stage of transmission can appropriately adjust the torque and speed, further enhancing the power output performance of the manual drive device and ensuring that the valve can be precisely controlled.

[0014] In one possible design, a cylinder is installed between the manual drive device and the pneumatic drive device, the center screw rod passes through the cylinder barrel, a limit block is protruded from the cylinder barrel, and a long groove arranged along its axial direction is opened on the outer peripheral surface of the center screw rod. The limit block is placed in the long groove and slides along the axial direction of the long groove.

[0015] With the above design, when the pneumatic drive device drives the center screw rod to move axially up and down, or the manual drive device indirectly drives the center screw rod through the connecting sleeve and other components, the cooperation of the limit block and the long slot can ensure that the center screw rod moves linearly along the predetermined axial direction, avoiding the center screw rod from deflecting, shaking, etc., and providing precise guiding for the axial movement of the center screw rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the appearance structure of a specific embodiment of the utility model;

[0017] Figure 2 A cross-sectional view of a specific embodiment of the present utility model;

[0018] Figure 3 The explosion of the switching device of the utility model Figure 1 ;

[0019] Figure 4 The explosion of the switching device of the utility model Figure 2 ;

[0020] Figure 5 This is a schematic structural diagram of the manual drive device of the utility model;

[0021] Figure 6 It is a partial structural diagram of a specific embodiment of the utility model;

[0022] Figure 7 This is a schematic structural diagram of the central screw rod and cylinder of the utility model;

[0023] Figure 8 This is a schematic structural diagram of the connector of the utility model;

[0024] Among them, 1. Switching device; 11. Shift handle; 12. Bagua wheel; 121. Bagua arc groove; 13. Split nut; 131. Pin shaft; 14. Connecting sleeve; 2. Manual drive device; 21. Handwheel; 22. Bevel gear shaft; 23. Driven bevel gear; 231. Push table protrusion; 24. Push inner ring; 241. Push groove; 25. Gear sleeve; 3. Pneumatic drive device; 31. Piston cylinder; 32. Piston chamber; 33. Piston disc; 34. Piston rod; 35. Connector; 351. T-hole; 352. T-slot; 4. Center screw; 41. T-rod head; 42. Long slot; 5. Cylinder; 51. Limit block. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 4The illustrated manual-automatic linear dual-piston actuator comprises a switching device 1, a manual drive device 2, a pneumatic drive device 3, and a center screw 4. The center screw 4 is connected to the pneumatic drive device 3, which drives the center screw 4 axially up and down. The switching device 1 comprises a shift handle 11, a Bagua wheel 12, a pair of split nuts 13, and a connecting sleeve 14. The shift handle 11 is fixed to the outer circumference of the Bagua wheel 12. The bottom surface of the Bagua wheel 12 defines a Bagua arc-shaped groove 121, which gradually approaches the center of the Bagua wheel 12 in an arc-shaped pattern. The center screw 4 passes between the two split nuts 13. A pin 131 is fixed to the top surface of the split nuts 13. This pin 131 is movably positioned in the Bagua arc-shaped groove 121 and can be displaced according to the groove's path, thereby driving the split nuts 13 radially toward or away from the center screw 4 along the connecting sleeve 14. When the split nut 13 approaches and contacts the center screw 4, the two form a threaded connection. The split nut 13 is installed in the connecting sleeve 14 and can be displaced in the radial direction of the connecting sleeve 14. The connecting sleeve 14 is key-connected to the manual drive device 2, and the manual drive device 2 can drive the connecting sleeve 14 to rotate, and the connecting sleeve 14 and the split nut 13 form a linkage connection in the circumferential direction. The split nut 13 can only move radially in the connecting sleeve 14, and drives the split nut 13 to rotate when the connecting sleeve 14 rotates. The Bagua wheel 12 is driven to rotate by the shift handle 11, and the special shape of the Bagua arc groove 121 is used to guide the pin shaft 131 to move, thereby realizing the connection or separation of the split nut 13 and the center screw 4. When the valve needs to be precisely fine-tuned, the manual mode can provide more precise control to meet the requirements for precise adjustment of valve parameters such as flow and pressure.

[0026] The pneumatic drive device 3 includes a piston cylinder 31, which contains two piston chambers 32. A piston disc 33 is movably mounted in each piston chamber 32. The two piston discs 33 are linked by a piston rod 34, which is connected to a central screw rod 4. When greater force is required to push the central screw rod 4 to control the opening or closing of a valve, particularly for large-caliber, high-pressure valves, a dual-piston structure can better meet this requirement.

[0027] like Figure 6 、 Figure 8As shown, the end of the piston rod 34 is fixedly connected to a connector 35. Connecting head 35 defines a T-hole 351, with a T-slot 352 radially extending from the T-hole 351. The bottom end of the center screw 4 has a T-rod head 41, which is inserted through the T-slot 352 into the T-hole 351, ensuring a rotational connection with the connector 35. The installation of the T-rod head 41 from the T-slot 352 into the T-hole 351 is simple and intuitive. During assembly, the operator can easily align the T-rod head 41 of the center screw 4 with the T-slot 352 of the connector 35 and then insert it into the T-hole 351 to complete the connection.

[0028] like Figure 5 As shown, the manual drive device 2 includes a handwheel 21, a bevel gear shaft 22, a driven bevel gear 23, a pushed inner ring 24, and a gear sleeve 25. The handwheel 21 is fixedly connected to the bevel gear shaft 22. The bevel gear shaft 22 meshes with the driven bevel gear 23 to form a bevel gear pair. The inner circumference of the driven bevel gear 23 is convexly provided with a push platform protrusion 231. The outer circumference of the pushed inner ring 24 is provided with a push groove 241. The push platform protrusion 231 is placed in the push groove 241 and is set against the groove wall of the push groove 241. The pushed inner ring 24 and the gear sleeve 25 are internally and externally meshed. The gear sleeve 25 is key-connected to the connecting sleeve 14. The driven bevel gear 23 cooperates with the push groove 241 of the pushed inner ring 24 to transmit power to the pushed inner ring 24. The pushed inner ring 24 then meshes internally and externally with the gear sleeve 25 to transmit power. Finally, the gear sleeve 25 is key-connected to the connecting sleeve 14 to drive the connecting sleeve 14 to rotate. The structural arrangement in which the push platform protrusion 231 on the inner periphery of the driven bevel gear 23 is placed in the push groove 241 on the outer periphery of the pushed inner ring 24 ensures that power can be effectively transmitted between the driven bevel gear 23 and the pushed inner ring 24. The cooperation between the push platform protrusion 231 and the push groove 241 can effectively prevent slippage and idling during power transmission, so that the rotational motion of the driven bevel gear 23 can be effectively converted into the synchronous rotation of the pushed inner ring 24, and then stably drive the center screw 4 through the gear sleeve 25 and the connecting sleeve 14.

[0029] like Figure 6 、 Figure 7As shown, a cylinder 5 is installed between the manual drive device 2 and the pneumatic drive device 3, and the center screw 4 passes through the cylinder 5. A stop block 51 is protruded from the cylinder 5. A long groove 42 is provided along its axial direction on the outer peripheral surface of the center screw 4. The stop block 51 is placed in the long groove 42 and slides along the axial direction of the long groove 42. During the switching process between the manual and automatic drive modes, the matching structure of the stop block 51 in the cylinder 5 and the long groove 42 of the center screw 4 helps the two drive modes to work better together. Whether the piston cylinder 31 of the pneumatic drive device 3 pushes the center screw 4, or the manual drive device 2 drives the center screw 4 through a series of transmission components, the stop block 51 can ensure the correct axial movement path of the center screw 4, making the transition between the manual and automatic drive modes smoother and more natural.

Claims

1. A manual-automatic linear double-piston actuator, characterized by: The invention comprises a switching device (1), a manual driving device (2), a pneumatic driving device (3) and a central screw rod (4), wherein the central screw rod (4) is connected to the pneumatic driving device (3) so as to drive the central screw rod (4) to rise and fall axially through the pneumatic driving device (3), and the switching device (1) comprises a shift handle (11), a Bagua wheel (12), a split nut (13) and a connecting sleeve (14), wherein the shift handle (11) is fixedly connected to the outer periphery of the Bagua wheel (12), and the bottom surface of the Bagua wheel (12) is provided with a Bagua arc groove (121), and the Bagua arc groove (121) gradually approaches the center of the Bagua wheel (12) from the outer periphery of the Bagua wheel (12) and is in an arc shape; The center screw (4) is inserted between the split nuts (13), and a pin (131) is fixed to the top surface of the split nut (13). The pin (131) is movably placed in the Bagua arc groove (121) and shifts according to the groove track of the Bagua arc groove (121) to drive the split nut (13) to approach or leave the center screw (4) along the radial direction of the connecting sleeve (14). When the split nut (13) is close to the center screw (4), it forms a threaded connection with the center screw (4); The split nut (13) is also installed in the connecting sleeve (14) and can be displaced in the radial direction of the connecting sleeve (14). The connecting sleeve (14) is key-connected to the manual drive device (2) so as to drive the connecting sleeve (14) to rotate through the manual drive device (2). The connecting sleeve (14) and the split nut (13) form a linkage connection in the circumferential direction to drive the split nut (13) to rotate.

2. The manual-automatic linear dual-piston actuator according to claim 1, characterized in that: The pneumatic drive device (3) includes a piston cylinder (31), wherein the piston cylinder (31) has two piston chambers (32), each piston chamber (32) is movably mounted with a piston disc (33), and the centers of the two piston discs (33) are linked by a piston rod (34), and the piston rod (34) is connected to the central screw rod (4).

3. The manual-automatic linear dual-piston actuator according to claim 2, characterized in that: The end of the piston rod (34) is fixedly connected to a connector (35), a T-shaped hole (351) is provided in the connector (35), a T-shaped slot (352) is provided on one radial side of the T-shaped hole (351), and the bottom end of the central screw rod (4) has a T-shaped rod head (41), and the T-shaped rod head (41) is inserted into the T-shaped hole (351) from the T-shaped slot (352) so as to be connected to the connector (35) only in relative rotation.

4. The manual-automatic linear dual-piston actuator according to claim 1 or 2, characterized in that: The manual drive device (2) comprises a hand wheel (21), a bevel gear shaft (22), a driven bevel gear (23), a pushed inner ring (24) and a gear sleeve (25), wherein the hand wheel (21) is fixedly connected to the bevel gear shaft (22), the bevel gear shaft (22) is meshed with the driven bevel gear (23), a push table convex block (231) is convexly provided on the inner periphery of the driven bevel gear (23), a push groove (241) is provided on the outer periphery of the pushed inner ring (24), the push table convex block (231) is placed in the push groove (241) and is arranged to abut against the groove wall of the push groove (241), the pushed inner ring (24) is meshed with the gear sleeve (25) inside and outside, and the gear sleeve (25) is key-connected to the connecting sleeve (14).

5. The manual-automatic linear dual-piston actuator according to claim 1 or 2, characterized in that: A cylinder (5) is installed between the manual drive device (2) and the pneumatic drive device (3), the central screw rod (4) passes through the cylinder (5), a stop block (51) is protruded from the cylinder (5), a long groove (42) arranged along its axial direction is opened on the outer peripheral surface of the central screw rod (4), and the stop block (51) is placed in the long groove (42) and slides along the axial direction of the long groove (42).

Images