Miniature actuator with mechanical anti-vibration stroke lock

Abstract

The invention provides a miniature actuator with a mechanical anti-vibration stroke lock. The miniature actuator comprises a shaft check ring, a magnetic ring, a piston dynamic seal, a guide ring, a shell, a piston rod, a collision bead, an end cover, a piston rod dynamic seal, an end cover static seal, a dustproof ring and the like. An oil port in a shell of the miniature actuator is connected with a hydraulic oil way, the actuator extends and retracts through reversing of a system oil way, a piston rod is connected with an external structure, and the functions of locking, plugging and the like are achieved. A magnetic sensor is arranged on the shell, and a magnetic ring at the tail of the piston and the magnetic sensor on the shell are inducted to judge the stretching and retracting states of the actuator; the collision bead is fixed in the shell, and when the actuator completely stretches out, the collision bead can be clamped into the V-shaped groove of the piston under the action of the spring force, and certain axial locking force is provided for the piston. According to the invention, it can be ensured that the piston has certain mechanical locking force and certain vibration resistance when the micro actuator is in a complete extension state, and the condition that the actuator retracts due to self weight or environmental vibration in a power-off state is prevented.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of hydraulic actuators, and particularly relates to a micro actuator with mechanical anti-vibration stroke lock. BACKGROUND

[0002] The micro actuator is mostly used in the occasion with limited installation space, when multiple micro actuators need to be synchronized or cooperated, the space layout and mass of the whole machine are difficult to meet the requirements due to the need of multiple motors for driving the actuator, the micro actuator can realize the simultaneous operation of multiple actuators due to its small size, high power density ratio and distributed characteristics of hydraulic drive, only one power source is needed. In some occasions with extremely limited installation space, compared with the micro electric cylinder, the space of the motor can be saved, and the volume is smaller and the power density ratio is higher.

[0003] Most of the existing hydraulic actuators prevent movement due to self weight or environment through hydraulic lock, but due to the leakage problem of the hydraulic system, the reliability cannot be guaranteed for a long time. The micro actuator has limited structure size, and the traditional mechanical limiting is difficult to realize, therefore, it is necessary to provide a micro actuator with mechanical anti-vibration stroke lock for the above technical problems.

[0004] PATENT CONTENT

[0005] The present application provides a micro actuator with mechanical anti-vibration stroke lock, which can ensure that the piston has a certain mechanical locking force in the fully extended state of the micro actuator, and has a certain anti-vibration ability, preventing the actuator from retracting due to self weight or environmental vibration in the power-off state, causing the failure of the external locking and plugging structure connected by the piston rod.

[0006] To achieve the above purpose, the technical scheme provided by the embodiments is as follows:

[0007] A micro actuator with mechanical anti-vibration stroke lock, comprising a sealing structure, a shell, a piston, a bump bead and an end cover, two oil ports are arranged on the shell, the two oil ports are connected with a hydraulic oil path, the piston is extended and retracted by reversing the oil path; the end cover is located at the end of the shell close to the oil outlet, the piston extends to the cavity of the shell through the end cover, the piston is sealingly connected with the inside of the shell and the end cover through the sealing structure, the bottom of the piston is provided with an annular V groove, the bump bead is pressed into the shell by a spring, when the piston is fully extended, the bump bead will be clamped into the annular V groove of the piston under the action of the spring force, providing the piston with axial locking force and anti-vibration ability.

[0008] Preferably, the bump beads are uniformly distributed in the shell in the radial direction, a process hole for pressing the bump bead is arranged on the shell opposite to the position of the bump bead, and the process hole is sealed and plugged by a ball expansion plug.

[0009] Preferably, the beads are evenly distributed at 120° along the radial direction.

[0010] Preferably, it also includes a magnetic ring, which is fixed to the bottom of the piston by a retaining ring. A starting magnetic sensor and an ending magnetic sensor are provided on the housing. The magnetic ring senses the starting magnetic sensor and the ending magnetic sensor to determine the extension and retraction state of the actuator.

[0011] Preferably, the sealing structure includes a piston dynamic seal and a guide ring, which are disposed on the piston for dynamic sealing between the piston and the housing.

[0012] Preferably, the sealing structure further includes a piston rod dynamic seal and a dustproof ring, which are disposed inside the end cover to provide a dynamic seal between the piston and the end cover, while also preventing dust.

[0013] Preferably, the sealing structure further includes an end cap static seal, disposed on the outside of the end cap, for sealing the end cap and the housing.

[0014] Compared with the prior art, the significant advantages of the present invention are:

[0015] 1. The micro actuator of the present invention has a smaller volume and a higher power density ratio compared with the micro electric cylinder when operating synchronously or in coordination.

[0016] 2. The miniature actuator of this invention uses electromagnetic induction for position detection. It has a simple structure, small size, and high sensitivity and reliability.

[0017] 3. The miniature actuator of this invention adopts a distributed ball-bearing structure, which realizes the mechanical anti-vibration stroke lock of the miniature actuator.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the retraction structure of a miniature actuator with a mechanical anti-vibration stroke lock according to the present invention.

[0020] Figure 2 This is a schematic diagram of the extended structure of a miniature actuator with a mechanical vibration-resistant stroke lock according to the present invention.

[0021] Figure 3 This is a schematic diagram of the ball-bearing structure of a miniature actuator with a mechanically anti-vibration stroke lock according to the present invention.

[0022] Figure 4 This is a three-dimensional schematic diagram of the extension of a miniature actuator with a mechanical vibration-resistant stroke lock according to the present invention.

[0023] In the diagram, 1-shaft retaining ring, 2-magnetic ring, 3-piston dynamic seal, 4-guide ring, 5-housing, 6-piston, 7-ball bearing, 8-end cover, 9-piston rod dynamic seal, 10-end cover static seal, 11-dust ring, 12-ball expansion plug, 13-magnetic sensor. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings. This embodiment should not be regarded as a limitation of the present invention.

[0025] Combined with appendix Figure 1 A miniature actuator with mechanical vibration-resistant stroke lock comprises: a shaft retaining ring 1, a magnetic ring 2, a piston dynamic seal 3, a guide ring 4, a housing 5, a piston 6, a ball bearing 7, an end cover 8, a piston rod dynamic seal 9, an end cover static seal 10, a dustproof ring 11, a ball expansion plug 12, and a magnetic sensor 13.

[0026] The oil port of the micro actuator housing 5 is connected to the hydraulic oil circuit. By reversing the system oil circuit, the actuator can extend and retract. The piston rod 6 is connected to the external structure to realize functions such as locking and insertion.

[0027] The magnetic ring 2 is fixed to the bottom of the piston 6 by a retaining ring 1.

[0028] like Figure 4 As shown, a starting magnetic sensor 13 and an ending magnetic sensor 14 are provided on the housing 5. The magnetic ring 2 at the tail of the piston 6 senses the magnetic sensor on the housing to determine the extension and retraction state of the actuator.

[0029] The piston dynamic seal 3 and guide ring 4 are used to achieve a dynamic seal between the piston 6 and the housing 5.

[0030] The piston rod dynamic seal 9 achieves dynamic sealing between the piston 6 and the end cover 8. The dust seal 11 not only prevents dust but also plays a certain guiding role, so that the piston rod 6 has a better sealing effect.

[0031] The end cap 8 and the end cap static seal 10 achieve shell sealing.

[0032] The ball expansion plug 12 is located at the process hole, which is used to press-fit the ball 7. After pressing, the ball expansion plug is used to seal and plug the process hole.

[0033] like Figure 2 As shown, the ball bearing 7 is fixed to the inside of the housing 5 by a spring and is evenly distributed at 120° along the radial direction. When the actuator is fully extended, the ball bearing 7 will be inserted into the annular V groove of the piston 6 under the action of the spring force, providing the piston 6 with a certain axial locking force and vibration resistance.

[0034] like Figure 3As shown, the ball bearings 7 are evenly distributed radially to ensure that 1-2 ball bearings 7 always work normally in the radial vibration environment, so that the actuator has a certain vibration resistance and prevents the piston from retracting due to its own weight under vibration.

[0035] This invention ensures that the piston has a certain mechanical locking force when the micro actuator is fully extended, and also has a certain vibration resistance, preventing the actuator from retracting due to its own weight or environmental vibration when the power is off.

[0036] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A miniature actuator with a mechanically anti-vibration stroke lock, characterized in that, The system includes a sealing structure, a housing (5), a piston (6), a ball bearing (7), and an end cap (8). The housing (5) has two oil ports connected to the hydraulic oil circuit. By reversing the oil circuit, the piston (6) can extend and retract. The end cap (8) is located at the end of the housing (5) near the oil outlet. The piston (6) extends through the end cap (8) into the cavity of the housing (5). The piston (6) is sealed to the inside of the housing (5) and the end cap (8) through the sealing structure. The bottom of the piston (6) has an annular V-groove. The ball bearing (7) is pressed into the housing (5) by a spring. When the piston (6) is fully extended, the ball bearing (7) will be stuck into the annular V-groove of the piston (6) under the action of the spring force, providing axial locking force and vibration resistance for the piston (6).

2. A miniature actuator with a mechanically anti-vibration stroke lock according to claim 1, characterized in that: The ball bearings (7) are evenly distributed radially inside the housing. A process hole for pressing the ball bearings (7) is provided on the housing opposite the position of the ball bearings (7). The process hole is sealed and blocked by a ball expansion plug (12).

3. A miniature actuator with a mechanical vibration-damping stroke lock according to claim 2, characterized in that: The beads (7) are evenly distributed radially at 120°.

4. A miniature actuator with a mechanically anti-vibration stroke lock according to claim 1, characterized in that: It also includes a magnetic ring (2), which is fixed to the bottom of the piston (6) by a shaft retaining ring (1). A starting magnetic sensor (13) and an ending magnetic sensor (14) are provided on the housing (5). The magnetic ring (2) senses the starting magnetic sensor (13) and the ending magnetic sensor (14) to determine the extension and retraction state of the actuator.

5. A miniature actuator with a mechanically anti-vibration stroke lock according to claim 1, characterized in that: The sealing structure includes a piston dynamic seal (3) and a guide ring (4), which are disposed on the piston (6) for dynamic sealing between the piston (6) and the housing (5).

6. A miniature actuator with a mechanical vibration-damping stroke lock according to claim 5, characterized in that: The sealing structure also includes a piston rod dynamic seal (9) and a dust seal (11), which are located inside the end cover (8) to provide a dynamic seal between the piston (6) and the end cover (8) and to prevent dust.

7. A miniature actuator with a mechanically anti-vibration stroke lock according to claim 6, characterized in that: The sealing structure also includes an end cap static seal (10), which is disposed on the outside of the end cap (8) for sealing the end cap (8) and the housing (5).

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