Initial locking device for actuating mechanism

Abstract

According to the initial locking device for the actuating mechanism, a connector is pushed through a piston, so that a steel ball falls into a groove, strong locking and weak unlocking of an actuating part of the actuating mechanism are achieved, the requirement for output force of an actuator is lowered under the same load condition of the actuating mechanism, and the working reliability of the actuating mechanism is improved. According to output characteristic requirements and load conditions, serialization and profile spectrum of actuating mechanism products are achieved through adaptive adjustment of output force of the compression spring, and the applicability and universality of the initial locking device are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical drive and transmission, and in particular relates to an initial locking device for an actuating mechanism. Background Art

[0002] The actuating mechanism uses fluid drive to push the piston to move, and transmits the motion and power to the actuator through the transmission device to achieve the expected one-time / multiple functions and actions of the actuator. The actuating mechanism uses an initial locking device to achieve locking and unlocking of the initial position, ensuring that the actuating mechanism can meet the external mechanical environment conditions before working, and at the same time ensuring that the actuating mechanism is normally unlocked during operation to achieve subsequent predetermined programs and actions.

[0003] At present, a shear pin is usually set between the movable part and the fixed part of the actuating mechanism, so that the movable part is initially locked and kept stationary. When unlocking is required, the movable part is driven to shear the shear pin, thereby completing the unlocking of the initial position. Shear pin locking-unlocking is a strong lock and strong release method. For working conditions with harsh mechanical environment, large external load or complex alternating, the locking force and unlocking force of the shear pin are increased at the same time, and the driving force requirements of the actuating mechanism are increased. At the same time, it is inevitable that a large impact load will be generated after unlocking. Therefore, it is necessary to design an initial locking device that can achieve strong lock and weak release of the actuating mechanism. Summary of the invention

[0004] In view of this, the present invention provides an initial locking device for an actuating mechanism, which can achieve strong locking and weak unlocking of the actuating mechanism, and meet the initial position locking, retention, unlocking and action requirements of the actuating mechanism.

[0005] An initial locking device for an actuating mechanism comprises a cylinder 1, a piston rod 2, a connecting piece 3, a steel ball 4, a compression spring 5, an output rod 6 and a frame 7; the cylinder 1 is fixed in the frame 7; the piston rod 2 is placed in the cylinder 1 and moves axially along the cylinder 1; one end of the piston rod 2 passes through the bottom of the cylinder 1 and is fixedly connected to the connecting piece 3; the output rod 6 is placed in the frame 7, and a notch is provided at the end facing the cylinder; the connecting piece 3 is nested in the notch, and a compression spring 5 is arranged between the bottom of the notch; a groove matching the steel ball 4 is provided on the circumferential direction of the outer circumferential surface of the connecting piece 3, a round hole for accommodating the steel ball 4 is provided on the side wall of the groove of the output rod 6, and a circumferential groove matching the steel ball 4 is provided on the inner wall of the frame 7.

[0006] Preferably, the piston rod 2 and the connecting member 3 are fixedly connected by threads.

[0007] Preferably, the number of grooves on the outer circumferential surface of the connecting member 3 and the inner wall of the frame 7, and the number of circular holes on the side walls of the grooves of the output rod 6 are determined according to the initial load and the power transmitted by the piston rod.

[0008] Preferably, the distance between the groove on the outer circumferential surface of the connecting member 3 and the groove on the inner wall of the frame 7 is determined according to a set unlocking stroke.

[0009] Preferably, the compression spring 5 is determined by the initial mechanical load environment.

[0010] Beneficial Effects

[0011] 1. The present invention discloses an initial locking device for an actuating mechanism, which pushes a connector by a piston to make a steel ball fall into a groove, thereby realizing strong locking and weak release of the actuator of the actuating mechanism, so that the output force requirement of the actuator is reduced under the same load conditions, thereby improving the working reliability of the actuating mechanism.

[0012] 2. The present invention discloses an initial locking device for an actuating mechanism. According to the output characteristic requirements and load conditions, the output force of the compression spring is adaptively adjusted to achieve serialization and spectrum of actuating mechanism products, thereby improving the applicability and versatility of the initial locking device.

[0013] 3. Two axial and circumferential grooves cooperating with the steel balls are symmetrically arranged on the outer circumferential surface of the connector to make the fixation more secure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of an initial locking state of an initial locking device for an actuating mechanism in an embodiment of the present invention;

[0015] Figure 2 It is a schematic diagram of an unlocked state of an initial locking device for an actuating mechanism in an embodiment of the present invention.

[0016] Among them: 1-cylinder, 2-piston rod, 3-connecting piece, 4-steel ball, 5-compression spring, 6-output rod, 7-frame. DETAILED DESCRIPTION

[0017] The implementation of the method of the present invention is described below with reference to the accompanying drawings and examples.

[0018] like Figure 1As shown, an initial locking device for an actuating mechanism comprises a cylinder 1, a piston rod 2, a connecting piece 3, a steel ball 4, a compression spring 5, an output rod 6 and a frame 7. The cylinder 1 is fixedly connected to the frame 7, the piston rod 2 is placed in the cylinder 1, and the piston rod 2 cooperates with the cylinder 1 and moves axially along the cylinder 1; one end of the piston rod 2 passes through the bottom of the cylinder 1 and is fixedly linked to the connecting piece 3, preferably by threaded connection, the output rod 6 is placed in the frame 7, and a notch is provided at one end facing the cylinder; the connecting piece 3 is nested inside the notch, and a compression spring 5 is provided between the end of the connecting piece 3 and the output rod 6, the outer circumferential surface of the connecting piece 3 is provided with a circumferential groove that cooperates with the steel ball 4, and the number of grooves on the outer circumferential surface of the connecting piece 3 and the inner wall of the frame 7, and the number of circular holes on the side wall of the groove of the output rod 6 is determined according to the initial load and the power transmitted by the piston rod. A circular hole for accommodating the steel ball 4 is provided on the output rod 6, and a circumferential groove that cooperates with the steel ball 4 is provided on the frame 7.

[0019] The distance between the groove on the outer circumferential surface of the connecting member 3 and the groove on the inner wall of the frame 7 is determined according to the set unlocking stroke. The compression spring is determined by the initial mechanical load environment.

[0020] like Figure 1 As shown, in the initial state, the output rod 6 is in the initial position, and the actuator piston rod 2 is completely retracted due to the force of the compression spring 5. The force provided by the compression spring 5 can meet the mechanical environmental conditions experienced by the actuating mechanism, ensuring that the piston rod 2 remains in the initial position before the actuator works. The steel ball 4 cooperates with the circumferential arc grooves of the connecting piece 3 and the circumferential arc grooves of the frame 7 at the same time, realizing the strong locking of the output rod 6 in the initial folded position.

[0021] like Figure 2 As shown, when the actuator starts working, the piston rod 2 outputs power under the action of the fluid pressure. After overcoming the force of the compression spring 5, it drives the connecting piece 3 to move linearly along the axial direction at the same time. After the movement distance reaches the idle stroke, the steel ball 4 cooperates with the circumferential arc groove of the connecting piece 3 to lock the output rod 6 and the connecting piece 3 as a whole. The linear motion of the piston rod 2 can be transmitted to the output rod 6 through the connecting piece 3, and only the force of the piston rod pushing is required to achieve weak unlocking.

[0022] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An initial locking device for an actuating mechanism, characterized in that: The invention comprises a cylinder (1), a piston rod (2), a connecting piece (3), a steel ball (4), a compression spring (5), an output rod (6) and a frame (7); the cylinder (1) is fixed in the frame (7); the piston rod (2) is placed in the cylinder (1) and moves axially along the cylinder (1); one end of the piston rod (2) passes through the bottom of the cylinder (1) and is fixedly connected to the connecting piece (3); the output rod (6) is placed in the frame (7), and a notch is provided at one end facing the cylinder; the connecting piece (3) is nested in the notch, and a compression spring (5) is arranged between the connecting piece (3) and the bottom of the notch; a groove matching the steel ball (4) is provided on the circumferential direction of the outer circumferential surface of the connecting piece (3), a round hole for accommodating the steel ball (4) is provided on the side wall of the groove of the output rod (6), and a circumferential groove matching the steel ball (4) is provided on the inner wall of the frame (7).

2. The initial locking device according to claim 1, characterized in that: The piston rod (2) and the connecting piece (3) are fixedly connected by threads.

3. The initial locking device according to claim 1, characterized in that: The number of grooves on the outer circumferential surface of the connecting member (3) and the inner wall of the frame (7), as well as the number of circular holes on the side wall of the groove of the output rod (6) are determined according to the initial load and the power transmitted by the piston rod.

4. The initial locking device according to claim 1, characterized in that: The distance between the groove on the outer circumferential surface of the connecting member (3) and the groove on the inner wall of the frame (7) is determined according to a set unlocking stroke.

5. The initial locking device according to claim 1, characterized in that: The compression spring (5) is determined by the initial mechanical loading environment.

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