CN219510102U - Mechanical locking retractable piston rod barrel bearing electromechanical actuator - Google Patents

Abstract

The utility model provides a mechanical locking retractable piston rod barrel bearing electromechanical actuator, and relates to a structure capable of improving bearing capacity of the electromechanical actuator and realizing heavy load locking. The utility model is realized by the following technical scheme: the screw nut is provided with an upper lock ring and a lower lock ring on ring disc bosses on two sides of the ring groove, the springs are restrained between the upper lock sleeve and the lower lock sleeve on two sides above the ring groove and between the opposite symmetrical bottom end rings, the springs keep the upper lock sleeve in the upper lock ring inner ring, the upper lock ring locking inclined plane and the upper lock groove inclined plane have the same angle and are attached, the upper lock ring cannot be ejected from the lock groove by external load, the upper lock ring cannot be prevented from being ejected from the upper lock groove of the outer cylinder to keep retraction locking, after the piston rod cylinder extends out of the upper lock, the angles of the lower lock ring locking inclined plane and the lower lock groove inclined plane of the cavity end of the outer cylinder are the same and are attached, locking of the lock ring locking is realized, and the double ends of the piston rod cylinder extending locking and retraction locking piston rod cylinder bear heavy load without crushing.

Description

Mechanical locking retractable piston rod barrel bearing electromechanical actuator

Technical Field

The utility model relates to the technical field of servo of an electromechanical actuator, in particular to a heavy load locking structure applied to the electromechanical actuator, and more particularly relates to an innovative structure capable of improving the bearing capacity of the electromechanical actuator and realizing heavy load locking.

Background

Actuators are increasingly using high performance (high efficiency, high load capacity, low weight) mechanical transmission devices (gears, screws) instead of hydraulic transmission devices, and thus electromechanical actuators (EMA) are produced, which, although they still cannot be compared with electro-hydraulic actuators at the load bearing limit, have a simpler structure and no hydraulic oil leakage problem. The heavy-load linear electromechanical actuator is used as a linear motion executing element and is an energy conversion device for realizing linear reciprocating motion or swinging motion smaller than 360 degrees of a working mechanism. The basic constitution of a common electric actuator is as follows: the device comprises a motor, a reduction gearbox, a transmission part, a ball screw pair, an outer cylinder assembly, a piston rod cylinder assembly, a self-locking assembly and the like. The adverse effects of mass and moment of inertia of mechanically moving parts are: increasing the mechanical load, the power of the driving motor needs to be increased; the response speed of the system is slowed down, and the sensitivity is reduced; the natural frequency of the system is lowered, and resonance is easy to occur. Because the moment of inertia of the high-speed motor in a servo system is dominant in the total inertia, often much greater than the moment of inertia of the load, particularly the deceleration

A larger system. The electric actuator cylinder with the self-locking device can prevent the movement caused by external force when the movement is stopped at a limited position, and is usually locked by a mechanical lock in the actuator cylinder. The mechanical lock is usually a steel ball lock, which consists of steel balls, locking grooves, conical pistons, springs and the like. The steel ball is arranged on the piston, and the locking groove is arranged on the outer cylinder. Because the steel ball is in point contact with the locking groove and the conical piston in the locking state, hidden danger of damaging the locking groove and the piston exists. The steel ball lock cannot meet the requirement of large load locking.

Disclosure of Invention

The utility model aims to provide a scheme which has a simple structure and can realize double-end heavy-load mechanical locking of a piston rod barrel. So as to effectively solve the problem that the conventional electric actuating cylinder lock structure can not meet the requirement of locking with large load.

The technical scheme adopted for solving the technical problems is as follows: a mechanically locked retracting piston rod cartridge load bearing electromechanical actuator comprising: the device comprises a gear transmission mechanism which axially stretches into a bottom sealing cavity of an outer cylinder (1) and is connected with a servo motor shaft gear, a screw transmission pair which is assembled in the transmission cavity of the outer cylinder 1 and is meshed with the gear transmission mechanism, a piston rod cylinder 8 which stretches out and draws back the outer cylinder 1, and a screw nut 7 which is sleeved with a screw 9, and is characterized in that: the free end of the screw rod 9 points to the bottom end of the piston rod barrel 8 through the screw rod nut 7, the left side annular groove boss of the screw rod nut 7 is provided with annular groove two side annular disc bosses, an upper lock ring 2 and a lower lock ring 6 which are tightly attached to the inner wall of the outer barrel 1 are arranged on the annular groove two side annular disc bosses, the upper lock ring and the lower lock ring are embedded into an upper lock bush 3 and a lower lock bush 5, the upper lock bush and the lower lock bush are symmetrical in opposite directions, a spring 4 is restrained between the upper side upper lock bush end ring and the lower lock bush end ring above the annular groove of the screw rod nut 7, the spring 4 is kept in a lock annular groove formed by the upper lock ring 2 and the lower lock ring 6, locking chamfer inclined planes of the upper lock ring 2 and the lower lock bush inclined planes are symmetrical in opposite directions, the same angle as the upper lock groove inclined planes of the lower lock bush and are attached, the upper lock ring cannot be ejected out from the lock groove by external load, the upper lock ring 2 cannot be separated from the upper lock groove of the outer barrel, the piston rod barrel 8 is kept to retract and lock, a left annular boss ring disc of the screw nut 7 is clung to the upper end face of an inner concave annular cavity of the piston barrel 8, a right lock catch of the upper lock ring 2 is locked in an upper lock groove 10 at the bottom end of the outer barrel 1 through a left step ring of the upper lock bush 3, a left lock catch of the lower lock ring 6 is coupled on an overlapping conical inclined surface of the right step ring of the lower lock bush 5 through a right annular boss ring of the lower lock bush 5, the screw 9 rotates, the screw nut 7 drives the piston rod barrel 8 to unlock and extend, the piston rod barrel 8 is pushed to extend to a position along a moving cavity of the outer barrel 1, and the left lock catch of the lower lock ring 6 is pushed into a lower lock groove 11 at the bottom end of the outer barrel 1, so that the piston rod barrel 8 extends and locks.

Compared with the prior art, the utility model has the following gain effects:

the utility model adopts a gear transmission mechanism which axially stretches into a sealing cavity at the bottom of the outer cylinder 1 and is connected with a servo motor shaft and a gear, a screw transmission pair which is assembled in the transmission cavity of the outer cylinder 1 and is meshed with the gear transmission mechanism, a piston rod cylinder 8 which stretches and stretches in the outer cylinder 1 and a screw nut 7 which is sleeved with a screw rod 9, and has simple structure.

The utility model restrains the spring 4 providing locking force in a circular seam formed by the cylinder wall of the piston rod cylinder 8, limits the rightward lock catch of the upper lock ring 2 from being unable to deviate from the upper lock groove 10 on the inner wall of the outer cylinder 1, keeps the piston rod cylinder 8 to retract and lock, rotates the lead screw 9, drives the piston rod cylinder 8 to extend and unlock, pushes the piston rod cylinder 8 to extend to a position along the moving cavity of the outer cylinder 1, pushes the leftward lock catch of the lower lock ring 6 to the lower lock groove 11 at the bottom end of the outer cylinder 1, realizes the extension and locking of the piston rod cylinder 8, and completes the extension and locking of the piston rod cylinder 8 and the bearing of heavy load at the double ends of the retraction and locking without crushing.

Thus solving the problem that the steel ball lock can not meet the large load.

Drawings

Fig. 1 is a cross-sectional view of a mechanically locked retracting piston rod cartridge carrying an electromechanical actuator in a normal operating condition.

Fig. 2 is an enlarged partial schematic view of fig. 1.

In the figure: the novel lock comprises an outer cylinder 1, an upper lock ring 2, an upper lock bushing 3, a spring 4, a lower lock bushing 5, a lower lock ring 6, a lead screw nut 7, a piston rod cylinder 8, a lead screw 9, an upper lock groove 10 and a lower lock groove 11.

The utility model will be further described with reference to the drawings and examples, without thereby restricting the utility model to the scope of the examples. All such concepts should be considered as being generic to the disclosure herein and to the scope of the utility model.

Detailed Description

See fig. 1 and 2. In a preferred embodiment described below, a mechanically locked retracting piston rod cartridge carries an electromechanical actuator comprising: the device comprises a sealing cavity at the bottom of an outer cylinder 1, a gear transmission mechanism connected with a servo motor shaft gear, a screw transmission pair assembled in the transmission cavity of the outer cylinder 1 and meshed with the gear transmission mechanism, a piston rod cylinder 8 which stretches out and draws back the outer cylinder 1, and a screw nut 7 sleeved with a screw 9, and is characterized in that: the free end of the screw rod 9 points to the bottom end of the piston rod barrel 8 through the screw rod nut 7, the left side annular groove boss of the screw rod nut 7 is provided with annular groove two side annular disc bosses, an upper lock ring 2 and a lower lock ring 6 which are tightly attached to the inner wall of the outer barrel 1 are arranged on the annular groove two side annular disc bosses, the upper lock ring and the lower lock ring are embedded into an upper lock bush 3 and a lower lock bush 5, the upper lock bush and the lower lock bush are symmetrical in opposite directions, a spring 4 is restrained between the upper side upper lock bush end ring and the lower lock bush end ring above the annular groove of the screw rod nut 7, the spring 4 is kept in a lock annular groove formed by the upper lock ring 2 and the lower lock ring 6, locking chamfer inclined planes of the upper lock ring 2 and the lower lock bush inclined planes are symmetrical in opposite directions, the same angle as the upper lock groove inclined planes of the lower lock bush and are attached, the upper lock ring cannot be ejected out from the lock groove by external load, the upper lock ring 2 cannot be separated from the upper lock groove of the outer barrel, the piston rod barrel 8 is kept to retract and lock, a left annular boss ring disc of the screw nut 7 is clung to the upper end face of an inner concave annular cavity of the piston barrel 8, a right lock catch of the upper lock ring 2 is locked in an upper lock groove 10 at the bottom end of the outer barrel 1 through a left step ring of the upper lock bush 3, a left lock catch of the lower lock ring 6 is coupled on an overlapping conical inclined surface of the right step ring of the lower lock bush 5 through a right annular boss ring of the lower lock bush 5, the screw 9 rotates, the screw nut 7 drives the piston rod barrel 8 to unlock and extend, the piston rod barrel 8 is pushed to extend to a position along a moving cavity of the outer barrel 1, and the left lock catch of the lower lock ring 6 is pushed into a lower lock groove 11 at the bottom end of the outer barrel 1, so that the piston rod barrel 8 extends and locks.

The right-hand lock catch inner ring surface of the upper lock catch 2 is jointed with the left-side step ring outer ring surface of the upper lock bush 3, the right-hand lock catch locking inclined surface is embedded into the upper lock groove 10 with the same inclined surface angle, and the external load can not release the right-hand lock catch of the upper lock catch 2 from the upper lock groove 10 so as to keep the piston rod barrel 8 to retract and lock.

The piston rod barrel 8 stretches out to drive the right lock catch of the upper lock ring 2 to be separated from the upper lock groove 10 for unlocking, the piston rod barrel 8 moves to the lower lock groove 11 at the cavity end of the outer barrel 1 along the outer barrel 1, the left lock catch locking inclined plane of the lower lock ring 6 is identical with the inclined plane angle of the lower lock groove 11 at the cavity end of the outer barrel 1 and is attached to and locked to stretch out of the piston rod barrel 8, and the piston rod barrel 8 is kept to stretch out and be locked.

When the piston rod barrel 8 is required to extend, the screw rod 9 rotates, the screw rod nut 7 pushes the upper lock bush 3 to overcome the elasticity of the spring 4, the upper lock ring 2 is locked and unlocked from the upper lock groove 10 in a right direction, the screw rod nut 7 pushes the piston rod barrel (8) to extend, the upper lock ring 2 is driven to shrink and deform along the conical inclined surface of the upper lock groove 10, after the upper lock ring 2 is pulled out from the inner ring of the upper lock ring 2, the ring groove boss ring disk on the right side of the screw rod nut 7 pushes the piston rod barrel 8 to extend, the upper lock ring 2 is driven to shrink and deform along the inclined surface of the upper lock groove 10, and finally the upper lock ring 2 is pulled out from the upper lock groove 10 to unlock.

When the screw nut 7 pushes the piston rod barrel 8 to move to an extension limit position, the lower lock ring 6 moves to the cavity end lock groove 11 of the lower outer barrel 1, and under the action of the elasticity of the spring 4, the lower lock bushing 5 clamps the right side step chamfer inclined plane into the left lock catch inner cone of the lower lock ring 6, so that the lower lock ring 6 cannot be separated from the cavity end lower lock groove 11 of the outer barrel 1 and keeps extension locking.

When the upper lock is locked, the inclined planes of the upper lock ring 2 and the upper lock groove 10 are in surface contact, and when the lower lock is locked, the inclined planes of the lower lock ring 6 and the lower lock groove 11 are in surface contact, so that the upper lock ring can bear heavy load without crushing.

The lead screw 9 is used for bearing load through the lead screw nut lock ring by the cavity end wall step Kong Yaoshu of the cavity bottom bearing accommodating cavity of the outer barrel 1.

While embodiments of the present utility model have been illustrated and described above, the embodiments of the present utility model have been described in detail, and the description of the embodiments is only for aiding in the understanding of the present utility model; also, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is not to be construed as limited by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (7)

1. A mechanically locked retracting piston rod cartridge load bearing electromechanical actuator comprising: the device comprises a gear transmission mechanism which axially stretches into a bottom sealing cavity of an outer cylinder (1) and is connected with a motor shaft gear, a screw transmission pair which is assembled in the transmission cavity of the outer cylinder (1) and is meshed with the gear transmission mechanism, and a piston rod cylinder (8) which stretches out and draws back the outer cylinder (1) and a screw nut (7) which is sleeved with a screw (9), and is characterized in that: the screw nut (7) is provided with ring disc bosses at two sides of the ring groove, an upper lock ring (2) and a lower lock ring (6) which are tightly attached to the inner wall of the outer cylinder (1), the upper lock ring and the lower lock ring are embedded into an upper lock bushing (3) and a lower lock bushing (5), the upper lock bushing and the lower lock bushing are symmetrical in opposite directions, a spring (4) is restrained between the upper lock bushing end ring and the lower lock bushing end ring at two sides above the ring groove of the screw nut (7), the spring (4) is kept in the lock ring groove formed by the upper lock bushing and the lower lock bushing, the locking chamfer inclined planes of the upper lock ring (2) and the lower lock ring (6) are symmetrical in opposite directions, the angles of the locking chamfer inclined planes of the upper lock bushing and the lower lock bushing are the same, the upper lock ring and the lower lock bushing cannot be ejected from the lock groove by external load, limiting the upper lock ring (2) not to be separated from the upper lock groove of the outer cylinder, keeping the piston rod cylinder (8) to retract and lock, enabling a left annular boss ring disk of the screw nut (7) to be clung to the upper end face of an inner concave annular cavity of the piston rod cylinder (8), enabling a right-direction lock catch of the upper lock ring (2) to fall into an upper lock groove (10) at the bottom end of the outer cylinder (1) through a left step ring of the upper lock sleeve (3), enabling a right annular boss ring disk of the screw nut (7) to couple a left-direction lock catch of the lower lock ring (6) on an overlapping conical inclined surface of a right-side step ring of the lower lock sleeve (5) through a right-side step ring of the lower lock sleeve (5), enabling the screw (9) to rotate, enabling the screw nut (7) to drive the piston rod cylinder (8) to unlock and stretch out, the piston rod cylinder (8) is pushed to extend to a position along the movement cavity of the outer cylinder (1), and the left lock catch of the lower lock ring (6) is pushed into the lower lock groove (11) at the bottom end of the outer cylinder (1), so that the piston rod cylinder (8) is locked in an extending mode.

2. The mechanically locked retracting piston rod cartridge carrying electromechanical actuator of claim 1, wherein: the inner annular surface of the right lock catch of the upper lock catch (2) is matched with the outer annular surface of the left step ring of the upper lock bush (3), the locking inclined surface of the right lock catch is embedded into the upper lock groove (10) with the same inclined surface angle, and the outer load cannot release the right lock catch of the upper lock catch (2) from the upper lock groove (10) so as to keep the piston rod barrel (8) to retract and lock.

3. The mechanically locked retracting piston rod cartridge carrying electromechanical actuator of claim 1, wherein: the piston rod cylinder (8) stretches out, drives the upper lock ring (2) to release from the upper lock groove (10), the piston rod cylinder (8) moves to the lower lock groove (11) at the cavity end of the outer cylinder (1) along the outer cylinder (1), the left lock locking inclined plane of the lower lock ring (6) is the same as the inclined plane angle of the lower lock groove (11) at the cavity end of the outer cylinder (1) and is attached to and locked to stretch out of the piston rod cylinder (8), and the piston rod cylinder (8) is kept to stretch out and be locked.

4. The mechanically locked retracting piston rod cartridge carrying electromechanical actuator of claim 1, wherein: the screw rod (9) rotates, the left annular boss annular disk of the screw rod nut (7) pushes the upper lock bushing (3) to overcome the elasticity of the spring (4), the screw rod nut (7) pushes the piston rod barrel (8) to extend, the upper lock ring (2) is driven to shrink and deform along the conical inclined plane of the upper lock groove (10), the upper lock ring (2) is locked and unlocked from the upper lock groove (10) in a right direction, and finally the upper lock ring is unlocked from the upper lock groove (10).

5. The mechanically locked retracting piston rod cartridge carrying electromechanical actuator of claim 1, wherein: the screw nut (7) pushes the piston rod cylinder (8) to move to an extension limit position, the lower lock ring (6) moves to a lower lock groove (11) at the cavity end of the outer cylinder (1), and under the action of the elasticity of the spring (4), the lower lock bushing (5) clamps the right side step chamfer inclined plane into the left lock catch inner cone of the lower lock ring (6), so that the lower lock ring (6) cannot be separated from the lower lock groove (11) at the cavity end of the outer cylinder (1) to be kept in extension locking.

6. The mechanically locked retracting piston rod cartridge carrying electromechanical actuator of claim 1, wherein: the upper lock ring (2) is in surface contact with the inclined surface of the upper lock groove (10), and the lower lock ring (6) is in surface contact with the inclined surface of the lower lock groove (11) when the lower lock is locked.

7. The mechanically locked retracting piston rod cartridge carrying electromechanical actuator of claim 1, wherein: the lead screw nut (7) is used for accommodating the cavity end wall step Kong Yaoshu through the cavity bottom bearing of the outer barrel (1), and the load is borne by penetrating through the lock ring of the lead screw nut (7).