Structure for eliminating unlocking impact of actuator

Abstract

The invention relates to the technical field of actuators, and discloses a structure for eliminating the unlocking impact of an actuator, the structure 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 lock lining, an upper lock lining supporting spring, an upper lock upper lock lining and a sliding lining, the lower locking block is further provided with a lower locking block second convex part and a lower locking block third convex part, the inner wall of the outer cylinder is provided with a third limiting groove for limiting the lower locking block, the sliding bush is provided with a supporting convex part for limiting the lower locking block, and the supporting convex part is connected with the second pushing end. By improving an original actuator mechanical lock structure, the piston rod and the sliding bush can be relatively fixed while the mechanical lock is unlocked, impact caused by the fact that the piston rod is free of axial rigid support is eliminated, the overall change amount is small, the system operation stability is effectively improved, and the service life of parts is effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of actuators, in particular to a structure for eliminating unlocking impact of an actuator. Background Art

[0002] Actuators are widely used in industries such as aerospace as the power source of actuators. 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 be in the form of mechanical locks or brakes. Mechanical locks are widely used because they have the advantages of high reliability and no need for additional control devices.

[0003] After the existing mechanical lock has locked the actuator, when it needs to be unlocked, there will be a large impact between the piston rod and the mechanical lock, which 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. Summary of the invention

[0004] The object of the present invention is to provide a structure for eliminating the impact of unlocking an actuator, so as to solve the problem that the existing actuator with a mechanical lock has a large impact when unlocking.

[0005] The present invention is achieved through the following technical scheme: a structure for eliminating the unlocking impact of an actuator, comprising an outer cylinder, a piston rod, an upper lock block, a lower lock block, a lower lock locking bushing, an upper lock bushing supporting spring, an upper lock locking bushing, and a sliding bushing, the piston rod is slidably connected to the outer cylinder along the axial direction, and the upper lock block and the lower lock block are both radially slidably connected to the piston rod, the upper lock block comprises an upper lock block base, an upper lock block base is provided with a first convex portion of the upper lock block and a second convex portion of the upper lock block, the lower lock block comprises a lower lock block base, a lower lock block base is provided with a first convex portion of the lower lock block, the lower lock upper lock bushing and the upper lock locking bushing are both slidably connected to the sliding bushing along the axial direction, the upper lock bushing supporting spring is arranged between the lower lock upper lock bushing and the upper lock locking bushing, and the sliding bushing comprises a shift The movable pair, the first pushing end, the second pushing end, the movable pair, the first pushing end, and the second pushing end are integrally connected, and the movable pair is axially slidably connected to the piston rod, and the locking bushing of the lower lock, the locking bushing supporting spring, and the locking bushing of the upper lock are arranged between the first pushing end and the second pushing end, and the inner wall of the outer cylinder is provided with a first limiting groove for limiting the upper locking block and a second limiting groove for limiting the lower locking block. The first limiting end and the second limiting end are provided on the piston rod, and the movable pair is between the first limiting end and the second limiting end, and the lower locking block is also provided with a second convex portion of the lower locking block and a third convex portion of the lower locking block, and the inner wall of the outer cylinder is provided with a third limiting groove for limiting the lower locking block, and the sliding bushing is provided with a supporting convex portion for limiting the lower locking block, and the supporting convex portion is connected to the second pushing end.

[0006] In order to better realize the present invention, further, the third limiting groove includes 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 convex portion of the lower locking block cooperates with the third limiting surface, and the second convex portion of the lower locking block cooperates with the fourth limiting surface.

[0007] In order to better realize the present invention, further, the first limiting groove includes at least a first limiting surface and a second limiting surface, and a spacing is set between the first limiting surface and the second limiting surface, and the first convex portion of the upper locking block cooperates with the first limiting surface and the second limiting surface.

[0008] In order to better implement the present invention, 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 implement the present invention, further, the inclination angles of the first limiting surface, the second limiting surface, the third limiting surface, and the fourth limiting surface with respect to the horizontal direction are thirty degrees to forty-five degrees.

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

[0011] (1) The present invention improves the original mechanical lock structure of the actuator, and can relatively fix the piston rod and the sliding bushing when the mechanical lock is unlocked, thereby eliminating the impact of the piston rod caused by the lack of axial rigid support. The overall modification is small, which effectively improves the stability of system operation and the life of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the mechanical lock structure of the existing actuator Figure 1 .

[0013] Figure 2 Schematic diagram of the mechanical lock structure of the existing actuator Figure 2 .

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

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

[0016] Figure 5 The operation process of the present invention is shown in FIG. Figure 1 .

[0017] Figure 6 The operation process of the present invention is shown in FIG. Figure 2 .

[0018] Figure 7 The operation process of the present invention is shown in FIG. Figure 3 .

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

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Embodiment 1:

[0023] This embodiment provides a structure for eliminating the unlocking impact of the actuator. Figure 1-Figure 2As shown, a structure for eliminating the unlocking impact of the actuator comprises an outer cylinder 1, a piston rod 2, an upper locking block 3, a lower locking block 4, a lower lock locking bushing 5, an upper locking bushing support spring 6, an upper lock locking bushing 7, and a sliding bushing 8. The piston rod 2 is axially slidably connected to the outer cylinder 1, and 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 comprises an upper locking block base 31, and the upper locking block base 31 is provided with an upper locking block first convex portion 32 and an upper locking block second convex portion 33. The lower locking block 4 comprises a lower locking block base 41, and the lower locking block base 41 is provided with a lower locking block first convex portion 42. The lower lock locking bushing 5 and the upper lock locking bushing 7 are both axially slidably connected to the sliding bushing 8. The bushing support spring 6 is arranged between the locking bushing 5 of the lower lock and the locking bushing 7 of the upper lock. The sliding bushing 8 includes 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 axially slidably connected to the piston rod 2. The locking bushing 5 of the lower lock, the locking bushing support spring 6, and the locking bushing 7 of the upper lock 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, and the moving 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. Figure 1 For example, when the internal structure of the actuator (such as the lead screw nut, etc.) pushes the sliding bushing 8 to move rightward by a stroke δ to Figure 2 In the state shown, the end surface of the first pushing end 82 pushes the upper lock locking bushing 7 to compress the upper lock bushing supporting spring 6, and its elastic force acts on the piston rod 2 through the lower lock locking bushing 5 and the lower lock block 4, so that the piston rod 2 is subjected to a rightward elastic force, and the elastic force also acts on the first limiting groove through the upper lock block first protrusion 32 on the upper lock block 3. At this time, the reaction force of the first limiting groove will radially squeeze the upper lock block 3 to block it. Since the upper lock locking bushing 7 supporting the upper lock block base 31 is pushed away by the first pushing end 82, the upper lock locking bushing 7 cannot limit the upper lock block 3, so the upper lock block 3 begins to radially contract (such as Figure 2In the figure, the upper locking block 3 moves from the dotted line position to the solid line position), at which time the upper locking block 3 will not hinder the relative movement of the outer cylinder 1 and the piston rod 2, thus achieving unlocking. However, after unlocking, due to the high oil pressure, a large rightward force will be applied to the piston rod 2. Then, due to the lack of axial rigid support, the piston rod 2 will move rapidly to the right. At this time, the upper locking bushing support spring 6 is further compressed until the moving pair 81 hits the end face of the first limit end 21, and its stroke is the unlocking stroke δ. This is the unlocking impact of the actuator, which will significantly reduce the life of the actuator and cause vibration and noise of the actuator, which has an adverse effect on the entire mechanism.

[0025] Similarly, when the piston rod 2 is extended to work, when the lower lock block 4 reaches the second limit groove, the elastic force of the upper lock bushing support spring 6 drives the lower lock upper lock bushing 5 to push the lower lock block 4 into the second limit groove, and then the sliding bushing 8 continues to move, so that the lower lock upper lock bushing 5 completely supports the lower lock block 4. At this time, the lower lock block 4 is limited by the second limit groove, so that the outer tube 1 and the piston rod 2 cannot move relative to each other, and the unlocking can be performed in the same way as described above. In this way, the extension and retraction locking functions of the piston rod 2 are realized.

[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 protrusion 43 of the lower locking block and a third protrusion 44 of the lower locking block, the inner wall of the outer cylinder 1 is provided with a third limiting groove for limiting the lower locking block 4, and the sliding bushing 8 is provided with a supporting protrusion 84 for limiting the lower locking block 4, and 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 nut, etc.) pushes the sliding bushing 8 to move rightward by a stroke δ to Figure 5 When the locking cam 81 is in the state shown, the movable pair 81 moves from the first limit end 21 to the second limit end 22. At this time, the third protrusion 44 of the lower lock block is first lifted up by the supporting protrusion 84, and then further lifted up by the locking bushing 5 of the lower lock, so that the second protrusion 43 of the lower lock block is embedded in the third limit groove. At this time, the third protrusion 44 of the lower lock block moves from the right side of the supporting protrusion 84 to the middle, and the top of the supporting protrusion 84 supports the top of the third protrusion 44 of the lower lock block. At the same time, the upper lock block 3 is also unlocked. At this time, if a rightward force is applied to the piston rod 2, due to the support of the supporting protrusion 84 on the lower lock block 4 and the limitation of the lower lock block 4 by the third limit groove, the lower lock 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] Afterwards, as the internal structure of the actuator (such as the lead screw nut, etc.) continues to push the sliding bushing 8 to move to the right, the oil pressure will also cause the piston rod 2 to squeeze the first protrusion 42 of the lower lock block, so that the third limiting groove applies a radial contraction force to the second protrusion 43 of the lower lock block. At this time, the first protrusion 42 of the lower lock block will squeeze the lower lock locking bushing 5, so that the locking bushing support spring 6 is further compressed, and then the third protrusion 44 of the lower lock block moves to the left side of the supporting protrusion 84. At this time, the supporting protrusion 84 no longer radially supports and limits 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 FIG. Figure 6 At this time, the outer cylinder 1 and the piston rod 2 can move relative to each other, but because the third protrusion 44 of the lower locking block is on the left side of the supporting protrusion 84, when the piston rod 2 moves to the right, the third protrusion 44 of the lower locking block will push the supporting protrusion 84, so that the sliding bushing 8 moves synchronously with the piston rod 2, as shown in FIG. Figure 7 shown.

[0029] Similarly, when the piston rod 2 is extended to work, when the lower locking block 4 reaches the second limit groove, the elastic force of the upper locking bushing support spring 6 drives the lower lock upper locking bushing 5 to push the second protrusion 43 of the lower locking block into the second limit groove, and then the internal structure of the actuator drives the sliding bushing 8 to move, and the third protrusion 44 of the lower locking block moves to the middle of the supporting protrusion 84, so that the supporting protrusion 84 supports the lower locking block 4. At this time, the lower locking block 4 is limited in position in cooperation with the action of the second limit groove, so that the outer tube 1 and the piston rod 2 cannot move relative to each other. When unlocking, the sliding bushing 8 is driven to make the third protrusion 44 of the lower lock block return to the right side of the supporting protrusion 84 to complete the unlocking, and due to the blocking of the lower lock block 4 by the supporting protrusion 84, the sliding bushing 8 will be driven to retract synchronously when the piston rod 2 is retracted, until the upper lock block 3 moves to the first limiting groove, the upper lock locking 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, and return to Figure 3 The initial state.

[0030] Embodiment 2:

[0031] This embodiment is further expanded on the basis of the above embodiment. Figure 4 As shown, 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 convex portion 42 of the lower locking block cooperates with the third limiting surface 13, and the second convex portion 43 of the lower locking block cooperates with the fourth limiting surface 14. This setting is used to limit the length of the lower locking block 4, so that the lower locking block 4 has a certain volume and meets the strength requirements.

[0032] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0033] Embodiment 3:

[0034] This embodiment is further expanded on the basis of the above embodiment. Figure 2 As shown, the first limiting groove at least includes a first limiting surface 11 and a second limiting surface 12, and a spacing is provided between the first limiting surface 11 and the second limiting surface 12, and the first convex portion 32 of the upper locking block matches the first limiting surface 11 and the second limiting surface 12. This 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 requirements.

[0035] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0036] Embodiment 4:

[0037] This embodiment is further expanded on the basis of the above embodiment. Figure 3 As shown, 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. Smooth conical surfaces can reduce the resistance during unlocking and reduce the wear of parts.

[0038] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0039] Embodiment 5:

[0040] This embodiment is further extended on the basis of the above embodiment, and the first limiting surface 11, the second limiting surface 12, the third limiting surface 13, and the fourth limiting surface 14 are inclined at an angle of thirty to forty-five degrees to the horizontal direction. This angle setting can stably achieve locking and effectively reduce the axial force of the parts when unlocking, thereby reducing the wear of the parts.

[0041] The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0042] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A structure for eliminating the unlocking impact of an actuator, comprising an outer cylinder (1), a piston rod (2), an upper locking block (3), a lower locking block (4), a lower locking bushing (5), an upper locking bushing support spring (6), an upper locking bushing (7), and a sliding bushing (8), wherein 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), and the upper locking block (3) comprises an upper locking block base (31), on which a first upper locking block protrusion (32) and a second upper locking block protrusion (33) are arranged; the lower locking block (4) comprises a lower locking block base (41), on which a first lower locking block protrusion (42) is arranged; the lower lock upper locking bushing (5) and the upper lock upper locking bushing (7) are both axially slidably connected to the sliding bushing (8); the upper locking bushing supports The spring (6) is arranged between the locking bushing (5) of the lower lock and the locking bushing (7) of the upper lock. 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 connected as a whole. The moving pair (81) is connected to the piston rod (2) in an axial sliding manner. The locking bushing (5) of the lower lock, the locking bushing supporting spring (6) and the locking bushing (7) of the upper lock 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 located between the first limiting end (21) and the second limiting end (22). The invention is characterized in that: 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).

2. A structure for eliminating actuator unlocking impact according to claim 1, characterized in that: The third limiting groove at least comprises 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 convex portion (42) of the lower locking block cooperates with the third limiting surface (13), and the second convex portion (43) of the lower locking block cooperates with the fourth limiting surface (14).

3. The structure for eliminating the actuator unlocking impact 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 provided between the first limiting surface (11) and the second limiting surface (12), and the first convex portion (32) of the upper locking block matches the first limiting surface (11) and the second limiting surface (12).

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

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