Hand wheel driving mechanism for high-frequency actuator

Abstract

The utility model relates to the technical field of actuators, in particular to a hand wheel driving mechanism for a high-frequency actuator, which comprises a support connected with an end cover of the actuator, a hand wheel support and a hand wheel shell seat are arranged on the support, and a screw rod sleeve is arranged at the top of the hand wheel shell seat. A large bevel gear is arranged in the gear mounting cavity, the inner ring of the large bevel gear is sleeved with a lead screw meshing sleeve, a lead screw is arranged in the lead screw meshing sleeve, and meshing sleeve threads capable of being meshed with the outer thread wall of the lead screw are arranged on the inner wall of the lead screw meshing sleeve; one end of the screw rod is connected with a piston rod, and the other end extends into the screw rod telescopic cavity; the inner ring of the small bevel gear is sleeved with the hand wheel rotating shaft. The mechanism is simple in structure, the internal structure of the actuator cannot be damaged, assembly and disassembly are convenient, a traditional pneumatic actuator can have the manual driving function, the control modes of the actuator can be effectively enriched, and safety control over the actuator under the emergency condition is improved.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, and in particular to a handwheel drive mechanism for high-frequency actuators. Background Technology

[0002] A high-frequency pneumatic actuator is a pneumatic actuator capable of operating at high frequencies. It uses compressed air as a power source, driving the opening and closing of valves through the reciprocating motion of a cylinder piston. When a control signal arrives, the pneumatic valve opens or closes, allowing compressed air to enter or exit the actuator's cylinder, thus pushing the piston. This motion is then transmitted to the valve stem via a linkage or other transmission mechanism, achieving valve opening, closing, or regulation. It features rapid response capabilities, enabling frequent action control in a short time, meeting the demands of high-frequency operation. It is widely used in manufacturing, industrial automation equipment, and the chemical and petroleum industries.

[0003] In existing high-frequency pneumatic actuators, in order to achieve rapid valve closure in emergency situations, a spring is usually fitted around the piston rod. When the valve is open, the piston rod drives the piston to compress the spring; when rapid valve closure is required, the resistance of the piston rod is directly eliminated, and the piston moves rapidly under the action of the spring's restoring force, thereby achieving rapid valve closure.

[0004] If the pneumatic device malfunctions, or in the event of a power outage, it becomes difficult to control the valve connected to the actuator using pneumatics, which could lead to a safety accident.

[0005] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this utility model is to overcome the problems of the prior art and provide a handwheel drive mechanism for high-frequency actuators. This mechanism addresses the technical problem that if the pneumatic device malfunctions or there is a power outage, it is difficult to control the valve connected to the actuator using pneumatics, which could lead to a safety accident.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A handwheel drive mechanism for a high-frequency actuator includes a bracket connected to the actuator end cover. A handwheel support is mounted on the bracket, and a handwheel housing with a gear mounting cavity is mounted on the handwheel support. A lead screw sleeve with a lead screw extension cavity is mounted on the top of the handwheel housing. A large bevel gear is movably mounted within the gear mounting cavity. A lead screw engagement sleeve is fitted inside the inner ring of the large bevel gear. A lead screw is mounted inside the lead screw engagement sleeve, and the inner wall of the lead screw engagement sleeve has an engagement sleeve thread that engages with the external thread wall of the lead screw. One end of the lead screw passes through the handwheel drive mechanism. The lead screw through hole on the wheel support is connected to the piston rod that extends into the bracket, and the other end of the lead screw extends into the lead screw telescopic cavity; the side of the handwheel housing is also provided with a small bevel gear movable cavity that can communicate with the gear mounting cavity, and a small bevel gear is movably disposed in the small bevel gear movable cavity and sealed by the small bevel gear movable cavity cover plate; the small bevel gear can mesh with the large bevel gear, the inner ring of the small bevel gear is sleeved on the handwheel shaft, and the other end of the handwheel shaft extends outward after passing through the shaft through hole opened on the small gear movable cavity cover plate, and a handwheel disc is provided at the end of the handwheel shaft.

[0009] Furthermore, the lead screw sleeve is connected to the top of the handwheel housing via a flange.

[0010] Furthermore, the inner wall of the movable cavity of the small bevel gear is provided with a bearing groove for embedding a rotating shaft bearing, and the inner ring of the rotating shaft bearing is sleeved with the handwheel shaft.

[0011] Furthermore, the bracket is T-shaped, including a bracket cylinder through which the piston rod and the lead screw pass, and a bracket support for forming a fixed connection with the actuator end cap.

[0012] Furthermore, the bracket is made of stainless steel.

[0013] Furthermore, the lead screw and the piston rod are connected by a coupling.

[0014] The handwheel drive mechanism for high-frequency actuators provided by this utility model allows for piston movement control by manually rotating the handwheel, thereby controlling the opening and closing of the valve, by installing the mechanism on the outside of the actuator's end cover. This mechanism is not only simple in structure and does not damage the actuator's internal structure, but it is also easy to install and remove, enabling traditional pneumatic actuators to also have manual drive functionality. This effectively enriches the actuator's control methods and improves safety control of the actuator in emergency situations. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the handwheel drive mechanism for a high-frequency actuator described in this utility model;

[0016] Figure 2 This is a schematic diagram of the handwheel drive mechanism for a high-frequency actuator described in this utility model installed on the high-frequency actuator.

[0017] Illustration markings:

[0018] 1-Actuator end cap;

[0019] 2-Support, 201-Support cylinder, 202-Support base;

[0020] 3-Handwheel support, 301-Screw through hole;

[0021] 4-Handwheel housing, 401-Gear mounting cavity, 402-Small bevel gear movable cavity, 403-Small gear movable cavity cover plate, 404-Rotating shaft through hole, 405-Bearing groove;

[0022] 5-Handwheel shaft;

[0023] 6-Handwheel;

[0024] 7-Screw sleeve, 701-Screw telescopic cavity;

[0025] 8-Large bevel gear;

[0026] 9-Screw engagement sleeve;

[0027] 10-Lead screw;

[0028] 11-Piston rod;

[0029] 12-Small bevel gear;

[0030] 13-Flange;

[0031] 14-Shaft bearing;

[0032] 15 - Coupling. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] like Figure 1 and Figure 2 As shown, this solution provides a handwheel drive mechanism for a high-frequency actuator, including a bracket 2 connected to the actuator end cover 1, a handwheel support 3 on the bracket 2, a handwheel housing 4 with a gear mounting cavity 401 on the handwheel support 3, and a screw sleeve 7 with a screw telescopic cavity 701 on the top of the handwheel housing 4.

[0035] A large bevel gear 8 is movably disposed in the gear mounting cavity 401. A lead screw engagement sleeve 9 is sleeved on the inner ring of the large bevel gear 8. A lead screw 10 is disposed inside the lead screw engagement sleeve 9, and an engagement sleeve thread is provided on the inner wall of the lead screw engagement sleeve 9, which can engage with the external thread wall of the lead screw 10.

[0036] One end of the lead screw 10 passes through the lead screw through hole 301 on the handwheel support 3 and is connected to the piston rod 11 that extends into the bracket 2. The other end of the lead screw 10 extends into the lead screw telescopic cavity 701. The lead screw 10 and the piston rod 11 are connected by a coupling 15, or by other connection methods, as long as the ends of the two are connected.

[0037] The side of the handwheel housing 4 is also provided with a small bevel gear movable cavity 402 that can communicate with the gear mounting cavity 401. A small bevel gear 12 is movably disposed in the small bevel gear movable cavity 402 and sealed by the small bevel gear movable cavity cover plate 403. The small bevel gear 12 can mesh with the large bevel gear 8. The inner ring of the small bevel gear 12 is sleeved on the handwheel shaft 5. The other end of the handwheel shaft 5 extends outward after passing through the shaft through hole 404 opened on the small bevel gear movable cavity cover plate 403, and a handwheel disc 6 is provided at the end of the handwheel shaft 5.

[0038] The handwheel drive mechanism provided in this solution is used to drive the piston by manually operating the handwheel in the event of a pneumatic failure or power outage of the high-frequency actuator, thereby controlling the valve assembly connected to the other end of the piston.

[0039] The control principle is as follows:

[0040] The handwheel 6 is manually rotated, which drives the small bevel gear 12 connected to it to rotate. The small bevel gear 12 then drives the large bevel gear 8 that meshes with it to rotate. Since the large bevel gear 8 rotates in a fixed position, it will drive the lead screw engagement sleeve 9 to rotate. The inner wall of the sleeve is provided with engagement thread, which will drive the lead screw 10 that meshes with it to extend or retract during the rotation.

[0041] It should be noted that, under the constraints of the above structure, the movement of the lead screw 10 will not cause rotation, and therefore will not cause the piston rod 11 connected to it to rotate.

[0042] In this embodiment, when the lead screw 10 extends, it can drive the piston rod 11 and the piston connected to it to close the valve.

[0043] When the lead screw 10 retracts, it can drive the piston rod 11 and piston connected to it to open the valve. In this embodiment, the lead screw extension cavity 701 is used to protect the extended lead screw 10.

[0044] The extension and retraction of the lead screw 10 are achieved by rotating the handwheel 6 clockwise or counterclockwise, respectively.

[0045] like Figure 1 As shown, as an optimization of this solution, the top of the lead screw sleeve 7 is connected to the top of the handwheel housing 4 via a flange 13, and the sealing between the handwheel housing 4 and the lead screw sleeve 7 is increased by means of sealing rings, etc., to ensure that the telescopic cavity of the lead screw 10 and the gear mounting cavity can communicate and be sealed.

[0046] The inner wall of the small bevel gear movable cavity 402 is also provided with a bearing groove 405 for embedding the rotating shaft bearing 14. The inner ring of the rotating shaft bearing 14 is sleeved with the handwheel rotating shaft 5. This structure can ensure stable moving support for the rotating shaft bearing 14, thereby ensuring that the small bevel gear 12 acts stably on the large bevel gear 8 and forms a stable mesh.

[0047] In this embodiment, the bracket 2 is T-shaped, including a bracket cylinder 201 through which the piston rod 11 and the lead screw 10 pass, and a bracket support 202 for forming a fixed connection with the actuator end cover 1;

[0048] This embodiment uses this structure to connect the support cylinder 201, the lead screw through hole 301, the gear mounting cavity 401, and the lead screw telescopic cavity 701 to each other, ensuring a sealed environment for the movement of the lead screw 10 and the piston rod 11.

[0049] The bracket 2 is made of stainless steel, which has the characteristics of high strength and corrosion resistance.

[0050] The above description is only for illustrating the embodiments of this utility model and is not intended to limit this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A handwheel drive mechanism for a high-frequency actuator, characterized in that, Includes a bracket (2) connected to the actuator end cover (1), a handwheel support (3) is provided on the bracket (2), a handwheel housing seat (4) with a gear mounting cavity (401) is provided on the handwheel support (3), and a screw sleeve (7) with a screw extension cavity (701) is provided on the top of the handwheel housing seat (4). A large bevel gear (8) is movably disposed in the gear mounting cavity (401). A screw engagement sleeve (9) is sleeved on the inner ring of the large bevel gear (8). A screw (10) is disposed in the screw engagement sleeve (9), and an engagement sleeve thread is provided on the inner wall of the screw engagement sleeve (9) that can engage with the external thread wall of the screw (10). One end of the lead screw (10) passes through the lead screw through hole (301) opened on the handwheel support (3) and is connected to the piston rod (11) that extends into the bracket (2). The other end of the lead screw (10) extends into the lead screw telescopic cavity (701). The side of the handwheel housing (4) is also provided with a small bevel gear movable cavity (402) that can communicate with the gear mounting cavity (401). A small bevel gear (12) is movably arranged in the small bevel gear movable cavity (402) and sealed by the small bevel gear movable cavity cover plate (403). The small bevel gear (12) can mesh with the large bevel gear (8). The inner ring of the small bevel gear (12) is connected to the handwheel shaft (5). The other end of the handwheel shaft (5) extends outward through the shaft through hole (404) opened on the small bevel gear movable cavity cover plate (403), and a handwheel disc (6) is provided at the end of the handwheel shaft (5).

2. The handwheel drive mechanism for a high-frequency actuator according to claim 1, characterized in that, The lead screw sleeve (7) is connected to the top of the handwheel housing (4) via a flange (13).

3. The handwheel drive mechanism for a high-frequency actuator according to claim 1, characterized in that, The inner wall of the small bevel gear movable cavity (402) is also provided with a bearing groove (405) for embedding the rotating shaft bearing (14), and the inner ring of the rotating shaft bearing (14) is sleeved with the handwheel shaft (5).

4. The handwheel drive mechanism for a high-frequency actuator according to claim 1, characterized in that, The bracket (2) is T-shaped and includes a bracket cylinder (201) through which the piston rod (11) and the lead screw (10) pass, and a bracket support (202) for forming a fixed connection with the actuator end cap (1).

5. The handwheel drive mechanism for a high-frequency actuator according to claim 1 or 3, characterized in that, The bracket (2) is made of stainless steel.

6. The handwheel drive mechanism for a high-frequency actuator according to claim 1, characterized in that, The lead screw (10) and the piston rod (11) are connected by a coupling (15).

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