CN108679038A - A kind of novel mechanical self-locking hydraulic actuator - Google Patents

Abstract

A new type of mechanical self-locking hydraulic actuator, including a cylinder, a piston rod, oil port 1 and oil port 2, and is characterized in that it also includes a screw, a clutch plate and a hydraulic motor; the right end of the piston rod is installed in the cylinder , the left end protrudes from the left side of the cylinder, the inside of the piston rod is hollow and tapped with internal threads, the left end is closed, and the right end is open; the right side wall of the cylinder has a screw hole, and the length of the screw is greater than the length of the cylinder, the left end of the screw is tapped with an external thread matching the internal thread of the piston rod, and the left end of the screw extends into the cylinder from the screw hole and passes through the internal thread. The screw thread and the external thread cooperate to extend into the hollow structure of the piston rod, and the helix angle of the external thread on the screw rod is smaller than the self-locking angle; the right end of the screw rod extends out of the cylinder, and passes through two pieces of The clutch plate is connected with the hydraulic motor; the oil port 1 and the oil port 2 are respectively arranged at the left and right ends of the cylinder side wall.

Description

A New Mechanical Self-locking Hydraulic Actuator

technical field

The invention relates to the technical field of hydraulic actuators, in particular to a novel mechanical self-locking hydraulic actuator.

Background technique

With the improvement of hydraulic component manufacturing technology and the rapid development of hydraulic technology, hydraulic control systems have played a role that cannot be ignored in many industries. However, due to the occurrence of mechanical loss, pressure loss, leakage loss, etc. in the hydraulic system, the hydraulic actuator will not be able to accurately achieve the intended goal, and even major accidents will occur due to the decrease in bearing capacity. Therefore, the stability of the hydraulic actuator is guaranteed. Load capacity is an important research content of current hydraulic system.

Contents of the invention

The purpose of the present invention is to solve the problem that the actuator cannot accurately move to the predetermined position due to the leakage oil sealing problem of the existing hydraulic cylinder under load. The present invention provides a novel mechanical self-locking hydraulic actuator, which includes a cylinder, a piston rod, oil port 1 and oil port 2, and is characterized in that it also includes a screw, a clutch plate, and a hydraulic motor; wherein,

The right end of the piston rod is installed in the cylinder, and the left end protrudes from the left side of the cylinder. The inside of the piston rod is hollow and tapped with internal threads. The left end is closed and the right end is open;

The cylinder wall on the right side of the cylinder has a screw hole, the length of the screw is greater than the length of the cylinder, and the left end of the screw has an external thread that matches the internal thread of the piston rod. The screw hole extends into the cylinder and extends into the hollow structure of the piston rod through the cooperation of the internal thread and the external thread, and the helix angle of the external thread on the screw is smaller than the self-locking angle;

The right end of the screw sticks out of the cylinder and is connected to the hydraulic motor through two clutch plates;

The first oil port and the second oil port are respectively arranged at the left and right ends of the side wall of the cylinder.

Further, when the hydraulic oil pushes the piston rod to move left and right, the hydraulic motor drives the screw to rotate simultaneously through the clutch plate, so that the movement of the piston rod and the rotation of the screw are synchronized.

Further, when the piston rod reaches a predetermined position, the hydraulic oil supply stops, the piston rod stops moving and at the same time the hydraulic motor stops running, and the screw rod stops rotating at the same time.

The invention provides a novel mechanical self-locking hydraulic actuator, which can realize the functions of reliable clamping and precise positioning at any position while bearing a large load. Under stable load conditions, it also prevents the problem of piston rod rollback due to a drop in load capacity due to leakage.

Description of drawings

Figure 1 is an exploded view of the overall structure of the present invention.

Fig. 2 is the sectional view of cylinder barrel, piston rod, screw rod and clutch plate in the present invention

In the figure: 1 cylinder, 2 oil port 1, 3 oil port 2, 4 piston rod, 5 screw rod, 6 clutch plate, 7 hydraulic motor

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings. At the same time, the orientations described in the claims of the present invention and the description are subject to the orientations shown in the drawings of the description. It should be understood that when the orientation of the present invention changes, the orientations will change accordingly.

The present invention provides a structural schematic diagram of a novel mechanical self-locking hydraulic actuator, see Fig. 1 and Fig. 2 . The new mechanical self-locking hydraulic actuator includes: cylinder 1, oil port 1, oil port 2 3, piston rod 4, screw rod 5, clutch plate 6, and hydraulic motor 7.

As shown in Figures 1 and 2, it is an exploded view of a new type of mechanical self-locking hydraulic actuator, including cylinder 1, oil port 1, oil port 2 3, piston rod 4, screw rod 5, clutch 6, and hydraulic motor 7. The inside of the piston rod 4 is a hollow structure, and the inner surface of the hollow structure is tapped with internal threads, and the outer surface of the screw rod 5 is designed with external threads to cooperate with the piston rod 4 with internal threads, wherein the screw rod 5 is designed The helix angle of the external thread is smaller than its self-locking angle. The left end of the piston rod 4 protrudes from the cylinder 1, and the right end is sleeved in the cylinder 1, and high-pressure oil is input through the oil port 2 3 to push the piston rod 4 to move to the left. When 4 moves to the right, high-pressure oil is input through oil port 1 to push the piston rod 4 to move to the right.

The length of the piston rod 5 is greater than the length of the cylinder 1, and its left end has a length of upward attack with an external thread, and its left end extends into the cylinder 1 from the right end of the cylinder 1, and rotates through the thread. into the hollow structure of the piston rod 4 .

The right end of the piston rod 5 is connected with the hydraulic motor 7 through two clutch plates 6 . The hydraulic motor 7 drives the screw rod 5 to rotate through the clutch plate 6, so that the movement of the piston rod 4 and the screw rod 5 are kept in a synchronous state. After the piston rod 4 reaches the predetermined position, the oil port 2 3 stops oil supply, and the screw rod 5 decelerates and stops rotating under the friction of the two clutch plates 6 because the hydraulic motor 7 stops rotating. Since the helix angle of the external thread of the screw rod 5 is smaller than the self-locking angle, self-locking is realized.

Claims (3)

1. The utility model provides a novel mechanical auto-lock hydraulic actuator, includes cylinder, piston rod, hydraulic fluid port one and hydraulic fluid port two, its characterized in that still includes: the hydraulic motor is connected with the clutch plate; wherein,

the right end of the piston rod is arranged in the cylinder barrel, the left end of the piston rod extends out of the left side of the cylinder barrel, the interior of the piston rod is of a hollow structure and is provided with internal threads, the left end of the piston rod is closed, and the right end of the piston rod is open;

a screw hole is formed in the wall of the right side of the cylinder barrel, the length of the screw is greater than that of the cylinder barrel, an external thread matched with the internal thread of the piston rod is tapped on a section of the left end of the screw, the left end of the screw extends into the cylinder barrel from the screw hole and extends into the hollow structure of the piston rod through the matching of the internal thread and the external thread, and the helix angle of the external thread on the screw is smaller than the self-locking angle;

the right end of the screw rod extends out of the cylinder barrel and is connected with the hydraulic motor through two clutch plates;

the first oil port and the second oil port are respectively arranged at the left end and the right end of the side wall of the cylinder barrel.

2. The novel mechanical self-locking hydraulic actuator according to claim 1, characterized in that: when the hydraulic oil pushes the piston rod to move left and right, the hydraulic motor drives the screw rod to rotate simultaneously through the clutch plate, so that the movement of the piston rod and the rotation of the screw rod are kept synchronous.

3. The novel mechanical self-locking hydraulic actuator according to claim 1, characterized in that: and when the piston rod reaches a preset position, the hydraulic oil stops being supplied, the piston rod stops moving, the hydraulic motor simultaneously stops running, and the screw rod simultaneously stops rotating.