Structure for eliminating unlocking impact of actuator

Abstract

The application relates to the technical field of actuators and discloses a structure for eliminating unlocking impact of an actuator, which comprises an outer cylinder, a piston rod and a mechanical lock, the mechanical lock comprises an upper lock block, a lower lock block, a lower lock upper locking bush, an upper locking bush supporting spring, an upper lock upper locking bush and a sliding bush, a second protruding part of the lower lock block and a third protruding part of the lower lock block are further arranged on the lower lock block, a third limiting groove for limiting the lower lock block is arranged on the inner wall of the outer cylinder, a supporting protruding part for limiting the lower lock block is arranged on the sliding bush, and the supporting protruding part is connected with a second pushing end. The original actuator mechanical lock structure is improved, the piston rod is relatively fixed with the sliding bush when the mechanical lock is unlocked, the impact caused by the fact that the piston rod is not axially rigidly supported is eliminated, the overall change is small, and the stability of system operation and the service life of parts are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of actuators, in particular to a structure for eliminating unlocking impact of an actuator. BACKGROUND

[0002] Actuators are widely used in aerospace and other industries as power sources of execution mechanisms. Since the working mode of the actuator is to switch between the extended position and the retracted position, and the two positions need to be locked to bear the load. The locking method can adopt mechanical lock or brake, etc. Due to the high reliability of mechanical lock, no additional control device is needed, so it is widely used.

[0003] Then, when the existing mechanical lock needs to be unlocked, there will be a large impact between the piston rod and the mechanical lock, which will significantly reduce the service life of the actuator, cause vibration and noise of the execution mechanism, and have adverse effects on the entire mechanism. SUMMARY

[0004] The purpose of the present application is to provide a structure for eliminating unlocking impact of an actuator, which solves the problem of large impact when unlocking the existing actuator with a mechanical lock.

[0005] The present application is achieved by the following technical scheme: a structure for eliminating unlocking impact of an actuator, comprising an outer cylinder, a piston rod, an upper lock block, a lower lock block, a lower lock sleeve, an upper lock sleeve support spring, an upper lock sleeve, and a sliding sleeve, the piston rod is connected to the outer cylinder in an axial sliding manner, the upper lock block and the lower lock block are connected to the piston rod in a radial sliding manner, the upper lock block comprises an upper lock block base body, the upper lock block base body is provided with an upper lock block first protrusion and an upper lock block second protrusion, the lower lock block comprises a lower lock block base body, the lower lock block base body is provided with a lower lock block first protrusion, the lower lock sleeve and the upper lock sleeve are connected to the sliding sleeve in an axial sliding manner, the upper lock sleeve support spring is arranged between the lower lock sleeve and the upper lock sleeve, the sliding sleeve comprises a moving pair, a first pushing end and a second pushing end, the moving pair, the first pushing end and the second pushing end are connected in an integral manner, the moving pair is connected to the piston rod in an axial sliding manner, the lower lock sleeve, the upper lock sleeve support spring and the upper lock sleeve are arranged between the first pushing end and the second pushing end, the inner wall of the outer cylinder is provided with a first limiting groove for limiting the upper lock block and a second limiting groove for limiting the lower lock block, the piston rod is provided with a first limiting end and a second limiting end, the moving pair is located between the first limiting end and the second limiting end, the lower lock block is further provided with a lower lock block second protrusion and a lower lock block third protrusion, the inner wall of the outer cylinder is provided with a third limiting groove for limiting the lower lock block, the sliding sleeve is provided with a support protrusion for limiting the lower lock block, and the support protrusion is connected to the second pushing end.

[0006] In order to better realize the present application, further, the third limiting groove comprises at least a third limiting surface and a fourth limiting surface, and a spacing is arranged between the third limiting surface and the fourth limiting surface, the first protrusion of the lower lock block is matched with the third limiting surface, and the second protrusion of the lower lock block is matched with the fourth limiting surface.

[0007] In order to better realize the present application, further, the first limiting groove comprises at least a first limiting surface and a second limiting surface, and a spacing is arranged between the first limiting surface and the second limiting surface, the first protrusion of the upper lock block is matched with the first limiting surface and the second limiting surface.

[0008] In order to better realize the present application, further, the first limiting surface, the second limiting surface, the third limiting surface and the fourth limiting surface are all conical surfaces.

[0009] In order to better realize the present application, further, the inclination angle of the first limiting surface, the second limiting surface, the third limiting surface and the fourth limiting surface with the horizontal direction is thirty degrees to forty-five degrees.

[0010] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0011] (1) The present application improves the original actuator mechanical lock structure, can fix the piston rod and the sliding bushing at the same time when the mechanical lock is unlocked, eliminates the impact caused by the lack of axial rigid support of the piston rod, has small overall modification, and effectively improves the stability of system operation and the service life of parts. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a schematic diagram of the mechanical lock structure of the existing actuator Figure 1 .

[0013] Figure 2 is a schematic diagram of the mechanical lock structure of the existing actuator Figure 2 .

[0014] Figure 3 is a schematic diagram of the actuator, the lower lock block, the third limiting groove and the supporting protrusion structure.

[0015] Figure 4 is a schematic diagram of the lower lock block, the third limiting groove and the supporting protrusion structure.

[0016] Figure 5 is a schematic diagram of the operation process of the present application Figure 1 .

[0017] Figure 6 is a schematic diagram of the operation process of the present application Figure 2 .

[0018] Figure 7 Operation process of the present application Figure 3 .

[0019] Wherein: 1-outer cylinder; 2-piston rod; 3-upper lock block; 4-lower lock block; 5-lower lock upper lock bushing; 6-upper lock bushing support spring; 7-upper lock upper lock bushing; 8-sliding bushing; 11-first limit surface; 12-second limit surface; 13-third limit surface; 14-fourth limit surface; 21-first limit end; 22-second limit end; 31-upper lock block base body; 32-upper lock block first protrusion; 33-upper lock block second protrusion; 41-lower lock block base body; 42-lower lock block first protrusion; 43-lower lock block second protrusion; 44-lower lock block third protrusion; 81-moving pair; 82-first pushing end; 83-second pushing end; 84-supporting protrusion. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0021] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0022] Embodiment 1

[0023] The embodiment provides a structure for eliminating the unlocking impact of an actuator, specifically as follows Figures 1-2As shown, a structure for eliminating actuator unlocking impact includes an outer cylinder 1, a piston rod 2, an upper locking block 3, a lower locking block 4, a lower locking upper bushing 5, an upper locking bushing support spring 6, an upper locking upper bushing 7, and a sliding bushing 8. The piston rod 2 is axially slidably connected to the outer cylinder 1. The upper locking block 3 and the lower locking block 4 are both radially slidably connected to the piston rod 2. The upper locking block 3 includes an upper locking block base 31, on which are provided a first upper locking block protrusion 32 and a second upper locking block protrusion 33. The lower locking block 4 includes a lower locking block base 41, on which is provided a first lower locking block protrusion 42. The lower locking upper bushing 5 and the upper locking upper bushing 7 are both axially slidably connected to the sliding bushing 8. The bushing support spring 6 is disposed between the lower lock upper locking bushing 5 and the upper lock upper locking bushing 7. The sliding bushing 8 includes a sliding pair 81, a first pushing end 82, and a second pushing end 83, which are integrally connected. The sliding pair 81 is slidably connected to the piston rod 2 along the axial direction. The lower lock upper locking bushing 5, the upper locking bushing support spring 6, and the upper lock upper locking bushing 7 are disposed between the first pushing end 82 and the second pushing end 83. The inner wall of the outer cylinder 1 is provided with a first limiting groove for limiting the upper locking block 3 and a second limiting groove for limiting the lower locking block 4. The piston rod 2 is provided with a first limiting end 21 and a second limiting end 22, and the sliding pair 81 is located between the first limiting end 21 and the second limiting end 22.

[0024] The above structure is a common mechanical lock structure, with Figure 1 For example, when the internal structure of the actuator (such as the lead screw and nut) pushes the sliding bushing 8 to move to the right by a stroke δ... Figure 2 In the indicated state, the end face of the first pushing end 82 pushes the upper lock upper bushing 7 to press the upper lock bushing support spring 6. Its elastic force acts on the piston rod 2 through the lower lock upper bushing 5 and the lower lock block 4, causing the piston rod 2 to be subjected to a rightward elastic force. This elastic force also acts on the first limiting groove through the first protrusion 32 of the upper lock block 3. At this time, the reaction force of the first limiting groove will radially compress the upper lock block 3 to block it. Since the upper lock upper bushing 7 supporting the upper lock block base 31 is pushed away by the first pushing end 82, the upper lock upper bushing 7 can no longer limit the upper lock block 3. Therefore, the upper lock block 3 begins to retract radially (as shown). Figure 2(From the dotted line position to the solid line position), at this time, the upper locking block 3 will not obstruct the relative movement of the outer cylinder 1 and the piston rod 2, thus achieving unlocking. However, after unlocking, due to the large oil pressure, a large rightward force will be applied to the piston rod 2. Since there is no axial rigid support, the piston rod 2 will move rapidly to the right. At this time, the upper locking bushing support spring 6 will be further compressed until the moving pair 81 hits the end face of the first limit end 21. Its stroke is the unlocking stroke δ. This is the unlocking impact of the actuator. This situation will significantly reduce the life of the actuator and cause vibration and noise in the actuator, which has an adverse effect on the entire mechanism.

[0025] Similarly, when the piston rod 2 extends to operate, and the lower locking block 4 reaches the second limiting groove, the elastic force of the upper locking bushing support spring 6 drives the lower locking bushing 5 to push the lower locking block 4 into the second limiting groove. Then, the sliding bushing 8 continues to move, so that the lower locking bushing 5 completely supports the lower locking block 4. At this time, in conjunction with the action of the second limiting groove, the lower locking block 4 is limited, so that the outer cylinder 1 and the piston rod 2 cannot move relative to each other. Unlocking can be performed in the same way as described above. This realizes the extension, retraction, and locking function of the piston rod 2.

[0026] The innovative structure proposed in this case is as follows: Figure 3 , Figure 4 As shown, the lower locking block 4 is also provided with a second lower locking block protrusion 43 and a third lower locking block protrusion 44. The inner wall of the outer cylinder 1 is provided with a third limiting groove for limiting the lower locking block 4. The sliding bushing 8 is provided with a supporting protrusion 84 for limiting the lower locking block 4. The supporting protrusion 84 is connected to the second pushing end 83.

[0027] by Figure 3 For example, when the internal structure of the actuator (such as the lead screw and nut) pushes the sliding bushing 8 to move to the right by a stroke δ... Figure 5 In the indicated state, the moving pair 81 moves from one end of the first limiting end 21 to one end of the second limiting end 22. At this time, the third protrusion 44 of the lower locking block is first lifted by the supporting protrusion 84, and then further lifted by the lower locking bushing 5, so that the second protrusion 43 of the lower locking block is embedded in the third limiting groove. At this time, the third protrusion 44 of the lower locking block moves from the right side of the supporting protrusion 84 to the middle. The top of the supporting protrusion 84 supports the top of the third protrusion 44 of the lower locking block. At the same time, the upper locking block 3 is also unlocked. If a rightward force is applied to the piston rod 2, due to the support of the supporting protrusion 84 on the lower locking block 4 and the limitation of the third limiting groove on the lower locking block 4, the lower locking block 4 will block the movement of the piston rod 2, that is, the piston rod 2 and the outer cylinder 1 cannot move relative to each other, thus forming a rigid support, thereby eliminating the unlocking impact.

[0028] After the actuator internal structure (such as the screw nut, etc.) continues to push the sliding bushing 8 to move to the right, the oil pressure will also make the piston rod 2 extrude the first protrusion 42 of the lower lock block, so that the third limiting groove exerts a radial contraction force on the second protrusion 43 of the lower lock block. At this time, the first protrusion 42 of the lower lock block will extrude the upper lock bushing 5, so that the upper lock bushing support spring 6 is further compressed. Then the third protrusion 44 of the lower lock block moves to the left side of the support protrusion 84. At this time, the support protrusion 84 no longer radially supports the third protrusion 44 of the lower lock block, and the lower lock block 4 begins to radially contract away from the third limiting groove, as shown in Figure 6 ; At this time, the outer cylinder 1 and the piston rod 2 can move relatively, but since the third protrusion 44 of the lower lock block is on the left side of the support protrusion 84, when the piston rod 2 moves to the right, the third protrusion 44 of the lower lock block will push the support protrusion 84, so that the sliding bushing 8 moves synchronously with the piston rod 2, as shown in Figure 7 .

[0029] Similarly, after the piston rod 2 is extended for work, when the lower lock block 4 reaches the second limiting groove, the elastic force of the upper lock bushing support spring 6 drives the second protrusion 43 of the lower lock block to enter the second limiting groove. Then the actuator internal structure drives the sliding bushing 8 to move, and the third protrusion 44 of the lower lock block moves to the middle of the support protrusion 84, so that the support protrusion 84 supports the lower lock block 4. At this time, the second limiting groove limits the lower lock block 4, so that the outer cylinder 1 and the piston rod 2 cannot move relatively. When unlocking, the sliding bushing 8 makes the third protrusion 44 of the lower lock block return to the right side of the support protrusion 84 to complete the unlocking, and because the support protrusion 84 blocks the lower lock block 4, the piston rod 2 will drive the sliding bushing 8 to retract synchronously when it is retracted. Until the upper lock block 3 moves to the first limiting groove, the upper lock bushing 7 will push the second protrusion 33 of the upper lock block to make the first protrusion 32 of the upper lock block embedded in the first limiting groove, returning to the initial state as shown in Figure 3 .

[0030] Embodiment 2:

[0031] This embodiment is further expanded on the basis of the above-mentioned embodiment, as shown in Figure 4 , the third limiting groove at least includes a third limiting surface 13 and a fourth limiting surface 14, and a spacing is provided between the third limiting surface 13 and the fourth limiting surface 14. The first protrusion 42 of the lower lock block cooperates with the third limiting surface 13, and the second protrusion 43 of the lower lock block cooperates with the fourth limiting surface 14. This setting is used to limit the length of the lower lock block 4, so that the lower lock block 4 has a certain volume to meet the strength requirement.

[0032] The other parts of this embodiment are the same as the above-mentioned embodiment and will not be described again.

[0033] Embodiment 3:

[0034] The embodiment is further extended on the basis of the above-mentioned embodiment, and specifically as shown in Figure 2 The first limiting groove at least includes a first limiting surface 11, a second limiting surface 12, and a spacing is arranged between the first limiting surface 11 and the second limiting surface 12, and the first protruding part 32 of the upper locking block is matched with the first limiting surface 11 and the second limiting surface 12. The setting is used to limit the length of the upper locking block 3, so that the upper locking block 3 has a certain volume and meets the strength requirement.

[0035] The other parts of the embodiment are the same as the above-mentioned embodiment, and will not be repeated.

[0036] Embodiment 4:

[0037] The embodiment is further extended on the basis of the above-mentioned embodiment, and specifically as shown in Figure 3 The first limiting surface 11, the second limiting surface 12, the third limiting surface 13, and the fourth limiting surface 14 are all conical surfaces. The smooth conical surface can reduce the resistance when unlocking and reduce the wear of the parts.

[0038] The other parts of the embodiment are the same as the above-mentioned embodiment, and will not be repeated.

[0039] Embodiment 5:

[0040] The embodiment is further extended on the basis of the above-mentioned embodiment, and the inclination angle of the first limiting surface 11, the second limiting surface 12, the third limiting surface 13, and the fourth limiting surface 14 with the horizontal direction is thirty to forty-five degrees. The angle setting can stably realize locking and effectively reduce the axial stress of the parts when unlocking, and reduce the wear of the parts.

[0041] The other parts of the embodiment are the same as the above-mentioned embodiment, and will not be repeated.

[0042] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification and equivalent change of the above embodiment according to the technical essence of the present application all fall within the protection scope of the present application.

Claims

1. A structure for eliminating actuator unlocking impact, comprising an outer cylinder (1), a piston rod (2), an upper locking block (3), a lower locking block (4), a lower locking locking bushing (5), an upper locking bushing support spring (6), an upper locking locking bushing (7), a sliding bushing (8), the piston rod (2) is connected to the outer cylinder (1) in axial sliding, the upper locking block (3) and the lower locking block (4) are connected to the piston rod (2) in radial sliding, the upper locking block (3) comprises an upper locking block base body (31), the upper locking block base body (31) is provided with an upper locking block first protrusion (32) and an upper locking block second protrusion (33), the lower locking block (4) comprises a lower locking block base body (41), the lower locking block base body (41) is provided with a lower locking block first protrusion (42), the lower locking locking bushing (5) and the upper locking locking bushing (7) are connected to the sliding bushing (8) in axial sliding, the upper locking bushing support spring (6) is arranged between the lower locking locking bushing (5) and the upper locking locking bushing (7), the sliding bushing (8) comprises a moving pair (81), a first pushing end (82) and a second pushing end (83), the moving pair (81), the first pushing end (82) and the second pushing end (83) are integrally connected, the moving pair (81) is connected to the piston rod (2) in axial sliding, the lower locking locking bushing (5), the upper locking bushing support spring (6) and the upper locking locking bushing (7) are arranged between the first pushing end (82) and the second pushing end (83), the inner wall of the outer cylinder (1) is provided with a first limiting groove for limiting the upper locking block (3) and a second limiting groove for limiting the lower locking block (4), the piston rod (2) is provided with a first limiting end (21) and a second limiting end (22), the moving pair (81) is between the first limiting end (21) and the second limiting end (22), characterized in that: The lower lock block (4) is further provided with a lower lock block second protrusion (43) and a lower lock block third protrusion (44), the outer cylinder (1) is internally provided with a third limiting groove for limiting the lower lock block (4), the sliding bushing (8) is provided with a supporting protrusion (84) for limiting the lower lock block (4), and the supporting protrusion (84) is connected with the second pushing end (83).

2. The structure for eliminating the unlocking impact of an actuator according to claim 1, characterized in that: The third limiting groove comprises at least a third limiting surface (13) and a fourth limiting surface (14), and a spacing is arranged between the third limiting surface (13) and the fourth limiting surface (14), the lower lock block first protrusion (42) is matched with the third limiting surface (13), and the lower lock block second protrusion (43) is matched with the fourth limiting surface (14).

3. The structure for eliminating the unlocking impact of the actuator according to claim 2, characterized in that: The first limiting groove comprises at least a first limiting surface (11) and a second limiting surface (12), and a spacing is arranged between the first limiting surface (11) and the second limiting surface (12), and the upper lock block first protrusion (32) is matched with the first limiting surface (11) and the second limiting surface (12).

4. The structure for eliminating the unlocking impact of the actuator according to claim 3, characterized in that: The first limiting surface (11), the second limiting surface (12), the third limiting surface (13) and the fourth limiting surface (14) are all conical surfaces.

5. The structure for eliminating the unlocking impact of an actuator according to claim 4, characterized in that: The inclination angle between the first limiting surface (11), the second limiting surface (12), the third limiting surface (13) and the fourth limiting surface (14) and the horizontal direction is thirty degrees to forty-five degrees.

Images