Energy storage actuator

Abstract

The utility model discloses an energy storage actuator which comprises an outer cylinder, a piston assembly, a driving mechanism, a locking mechanism and an unlocking mechanism. Wherein the outer cylinder is of a cylinder structure with one closed end; the piston assembly comprises a piston piece and a piston rod which are arranged in the outer cylinder, the piston piece comprises a piston matched with the outer cylinder and an ejector rod connected with the piston, the piston rod is arranged in the outer cylinder in a sliding fit mode, and one end of the ejector rod extends into the piston rod and abuts against the piston rod; the driving mechanism is used for driving the piston rod to axially move along the outer cylinder; the locking mechanism is used for locking the position of the piston rod when the piston rod moves to the locking position; and the unlocking mechanism is used for unlocking the piston rod. The closed air chamber is formed through the outer cylinder and the piston assembly, the motor drives the piston to move towards the retraction end and compresses air in the air chamber, and when the piston needs to move towards the stretching end, the compressed air in the air chamber can release energy instantly, so that the piston stretches out rapidly.

Description

Technical Field

[0001] The utility model belongs to the technical field of actuating devices, and particularly relates to an energy storage actuator. Background Art

[0002] An actuator is a linear motion execution device used to achieve the energy conversion of the linear reciprocating motion or the swinging motion less than 360 degrees of a working mechanism. Since the circuit of a conventional electric actuator is difficult to withstand high instantaneous power, its extension speed is slow and it cannot achieve rapid load-bearing extension. Therefore, it is not applicable to the application scenarios that require the actuator to extend rapidly. For example, for the actuator of a drag parachute, due to its characteristic of rapid release, the instantaneous power of an electromechanical actuator will be very high, which poses a great challenge to the design of its peripheral circuits such as control circuits and power supply circuits. Summary of the Invention

[0003] The purpose of the utility model is to provide an energy storage actuator to solve the problem that the existing electric actuator cannot extend rapidly with a load.

[0004] The utility model is realized through the following technical solutions:

[0005] An energy storage actuator includes:

[0006] An outer cylinder, which is a cylindrical structure with one end closed;

[0007] A piston assembly, which includes a piston part and a piston rod arranged inside the outer cylinder. The piston part includes a piston that cooperates with the outer cylinder and a push rod connected to the piston. The piston rod is slidably arranged inside the outer cylinder, and one end of the push rod extends into the piston rod and abuts against the piston rod;

[0008] A driving mechanism for driving the piston rod to move axially along the outer cylinder;

[0009] A locking mechanism for locking the position of the piston rod when the piston rod moves to the locking position;

[0010] An unlocking structure for unlocking the piston rod.

[0011] In some embodiments, the driving mechanism includes a first motor, a first lead screw, and a first nut;

[0012] The first lead screw is sleeved outside the push rod;

[0013] One end of the first lead screw is threadedly connected to the first nut, and when the first lead screw rotates, it can drive the first nut to move linearly along the axial direction of the first lead screw;

[0014] The first motor is arranged on the outer cylinder and is used to drive the first lead screw to rotate.

[0015] In some embodiments, the first motor is connected to the first lead screw through a gear drive.

[0016] In some embodiments, a D-shaped shaft-hole mating structure is provided between the first nut and the piston rod.

[0017] In some embodiments, the locking mechanism includes a bushing, a locking member, and a spring;

[0018] Both ends of the spring are respectively connected to the piston rod and the bushing;

[0019] A through hole for mating with the locking member is provided on the piston rod, a groove for mating with the locking member is provided on the inner surface of the outer cylinder, the locking member is arranged in the through hole, and the locking member can move radially along the piston rod;

[0020] The bushing is sleeved on the first lead screw, and the bushing is provided with a locking portion and an unlocking portion. The locking portion is used to press the locking member into the groove, and the unlocking portion can provide a space for the locking member to move in a direction away from the groove and enable the locking member to escape from the groove.

[0021] In some embodiments, the locking member is a steel ball.

[0022] In some embodiments, a D-shaped shaft-hole mating structure is provided between the piston rod and the outer cylinder.

[0023] In some embodiments, the unlocking mechanism includes a second motor, a second lead screw, and a second nut;

[0024] The second lead screw is sleeved outside the first lead screw and is fixedly connected to the outer cylinder;

[0025] The second nut is threadedly connected to the second lead screw;

[0026] One end of the second nut abuts against the bushing;

[0027] The second motor drives the second nut to rotate and move axially along the second lead screw.

[0028] In some embodiments, the second motor and the second nut cooperate with each other through gears.

[0029] Compared with the prior art, the present utility model has the following beneficial effects:

[0030] The present utility model constructs a closed air chamber through the outer cylinder and the piston assembly. When the motor drives the piston to move towards the retracted end, the gas in the air chamber is compressed. When the piston needs to move towards the extended end, the compressed gas in the air chamber can instantaneously release energy, enabling the piston to quickly extend. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a structural sectional view of an embodiment of the present utility model.

[0033] Wherein:

[0034] 1 - outer cylinder, 2 - piston, 3 - first lead screw, 4 - second lead screw, 5 - second nut, 6 - bushing, 7 - locking member, 8 - spring, 9 - piston rod, 10 - first nut, 11 - second motor, 12 - first motor, 13 - air chamber, 14 - ejector rod. Specific embodiments

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0036] As Figure 1 shown, this embodiment is an energy storage actuator.

[0037] The core idea of the present utility model is to convert the electrical energy of the motor into air energy by driving the piston 2 to move towards the retraction end and compressing the gas in the air chamber 13. The air energy can be released instantaneously to drive the piston 2 to extend rapidly.

[0038] The energy storage actuator of this embodiment includes an outer cylinder 1, a piston assembly, a driving mechanism, a locking mechanism, and an unlocking mechanism.

[0039] Among them, the outer cylinder 1 is a cylindrical structure with one end closed.

[0040] The left end is the retraction end, and the right end is the extension end.

[0041] The piston assembly includes a piston member and a piston rod 9 arranged in the outer cylinder 1. The piston member includes a piston 2 that cooperates with the outer cylinder 1 and an ejector rod 14 connected to the piston 2. The piston rod 9 is slidably arranged in the outer cylinder 1, and one end of the ejector rod 14 extends into the piston rod 9 and abuts against the piston rod 9.

[0042] In this way, the piston 2 and the closed end of the outer cylinder 1 form a closed air chamber 13. Thus, when the piston 2 retracts, the air in the air chamber 13 can be compressed. After the piston 2 is unlocked, the compressed air in the air chamber 13 instantaneously releases energy, which can drive the piston 2 to quickly extend. Even if the load on the piston rod 9 is very large, it can still quickly extend with load.

[0043] A driving mechanism, which is used to drive the piston rod 9 to move axially along the outer cylinder 1, and then drive the ejector rod 14 and the piston 2 to move towards the retraction end, so as to achieve the purpose of compressing the gas in the air chamber 13.

[0044] In this embodiment, the driving mechanism specifically includes a first motor 12, a first lead screw 3 and a first nut 10;

[0045] The first lead screw 3 is sleeved outside the ejector rod 14; one end of the first lead screw 3 is threadedly connected to the first nut 10. When the first lead screw 3 rotates, it can drive the first nut 10 to move linearly along the axis of the first lead screw 3; the first motor 12 is arranged on the outer cylinder 1 and is used to drive the first lead screw 3 to rotate.

[0046] In order to make the first nut 10 move linearly, the rotation of the first nut 10 must be restricted.

[0047] In this embodiment, the rotation of the first nut 10 is restricted by setting the first nut 10 and the piston rod 9 as a D-shaped shaft-hole mating structure.

[0048] Among them, the first motor 12 and the first lead screw 3 are connected by gear transmission.

[0049] The locking mechanism is used to lock the position of the piston rod 9 when the piston rod 9 moves to the locking position.

[0050] The locking mechanism of this embodiment specifically includes a bushing 6, a locking member 7, and a spring 8;

[0051] Both ends of the spring 8 are respectively connected to the piston rod 9 and the bushing 6;

[0052] A through hole cooperating with the locking member 7 is provided on the piston rod 9, a groove cooperating with the locking member 7 is provided on the inner surface of the outer cylinder 1, the locking member 7 is arranged in the through hole, and the locking member 7 can move radially along the piston rod 9;

[0053] The bushing 6 is sleeved on the first lead screw 3. The bushing 6 is provided with a locking part and an unlocking part. The locking part is used to press the locking member 7 into the groove, and the unlocking part can provide space for the locking member 7 to move in a direction away from the groove and enable the locking member 7 to disengage from the groove;

[0054] The material shape, etc. of the locking member 7 can be selected according to actual needs. In this embodiment, the locking member 7 is a steel ball.

[0055] Since there is a mating relationship among the steel ball, the through hole and the groove, relative rotation between the piston rod 9 and the outer cylinder 1 should be avoided.

[0056] In this embodiment, relative rotation is restricted by setting the piston rod 9 and the outer cylinder 1 as a D-shaped shaft-hole mating structure.

[0057] The unlocking mechanism is used to release the locking of the piston rod 9.

[0058] The unlocking mechanism of this embodiment specifically includes a second motor 11, a second lead screw 4 and a second nut 5;

[0059] The second lead screw 4 is sleeved outside the first lead screw 3 and fixedly connected to the outer cylinder 1; the second nut 5 is threadedly connected to the second lead screw 4;

[0060] One end of the second nut 5 abuts against the bushing 6; the second motor 11 drives the second nut 5 to rotate and move axially along the second lead screw 4. Specifically, the second motor 11 and the second nut 5 cooperate with each other through gears.

[0061] When the second motor 11 rotates forward, it drives the second nut 5 to move towards the extending end, and the second nut 5 drives the bushing 6 to move towards the extending end, so that the locking part of the bushing 6 leaves the steel ball, and the steel ball slides out of the groove, completing the unlocking.

[0062] When the second motor 11 rotates reversely, it drives the second nut 5 to move towards the retracting end to reset the second nut 5.

[0063] The working stage of the energy storage actuator in this embodiment can be divided into an extending stage and a retracting stage.

[0064] Extending stage:

[0065] The initial state is the locked state, and the locking part of the bushing 6 locks the steel ball in the groove on the outer cylinder 1. Start the second motor 11 to rotate forward, and the second motor 11 drives the second nut 5 to rotate and move towards the bushing 6 through the gear. The second nut 5 drives the bushing 6 to move towards the extending end, so that the locking part of the bushing 6 leaves the steel ball, and the unlocking part faces the steel ball. The unlocking part provides a space for the steel ball to slide out of the groove, and the steel ball slides out of the groove to release the locking.

[0066] After the locking is released, the gas in the compressed state in the air chamber 13 is instantaneously released, driving the piston assembly to quickly extend towards the extending end.

[0067] Control the second motor 11 to rotate reversely, and the second motor 11 drives the second nut 5 to rotate and move towards the retracting end through the gear, so that the second nut 5 is reset.

[0068] Retracting stage:

[0069] Control the first motor 12 to rotate forward. The first motor 12 drives the first lead screw 3 to rotate through a gear. Since the rotation of the first nut 10 is restricted by the piston rod 9, the first nut 10 moves towards the retraction end. After the first nut 10 moves to the protrusion provided inside the piston rod 9, it drives the piston rod 9 to also move towards the retraction end. The piston rod 9 drives the ejector rod 14 and the piston 2 to move towards the retraction end, compressing the gas in the air chamber 13.

[0070] When the piston rod 9 moves to the locking position as shown in Figure 1 When the piston rod 9 moves to the locking position as shown in Figure 1 , the steel ball drops into the groove in the outer cylinder 1 and is driven by the force of the compression spring 8 to move the bushing 6 towards the retraction end, causing the locking portion of the bushing 6 to contact the steel ball and hold the steel ball against it so that it does not slide out of the groove, completing the locking.

[0071] Control the first motor 12 to rotate in reverse. The first motor 12 drives the first lead screw 3 to rotate through a gear. The first lead screw 3 drives the first nut 10 to move towards the extension end, returning the first nut 10 to its initial position to leave room for the extension of the piston rod 9.

[0072] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention falls within the protection scope of the present invention.

Claims

1. A energy storage actuator, characterized in that, Comprising: An outer cylinder (1), the outer cylinder (1) being a cylindrical structure with one end closed; A piston assembly, the piston assembly including a piston member disposed within the outer cylinder (1) and a piston rod (9), the piston member including a piston (2) cooperating with the outer cylinder (1) and a push rod (14) connected to the piston (2), the piston rod (9) being slidably disposed within the outer cylinder (1), one end of the push rod (14) extending into the piston rod (9) and abutting against the piston rod (9); A driving mechanism for driving the piston rod (9) to move axially along the outer cylinder (1); A locking mechanism for locking the position of the piston rod (9) when the piston rod (9) moves to a locking position; An unlocking mechanism for unlocking the piston rod (9).

2. The energy storage actuator according to claim 1, characterized in that, The driving mechanism includes a first motor (12), a first lead screw (3), and a first nut (10); The first lead screw (3) is sleeved outside the push rod (14); One end of the first lead screw (3) is threadedly connected to the first nut (10), and when the first lead screw (3) rotates, it can drive the first nut (10) to perform a linear motion along the axial direction of the first lead screw (3); The first motor (12) is disposed on the outer cylinder (1) for driving the first lead screw (3) to rotate.

3. The energy storage actuator according to claim 2, wherein, The first motor (12) is connected to the first lead screw (3) through a gear drive.

4. The energy storage actuator according to claim 2, characterized in that, A D-shaped shaft-hole mating structure is provided between the first nut (10) and the piston rod (9).

5. The energy storage actuator according to claim 2, characterized in that, The locking mechanism includes a bushing (6), a locking member (7), and a spring (8); Both ends of the spring (8) are respectively connected to the piston rod (9) and the bushing (6); A through hole cooperating with the locking member (7) is provided on the piston rod (9), a groove cooperating with the locking member (7) is provided on the inner surface of the outer cylinder (1), the locking member (7) is disposed within the through hole, and the locking member (7) can move radially along the piston rod (9); The bushing (6) is sleeved on the first lead screw (3), and the bushing (6) is provided with a locking portion and an unlocking portion. The locking portion is used to press the locking member (7) into the groove, and the unlocking portion can provide a space for the locking member (7) to move in a direction away from the groove and enable the locking member (7) to escape from the groove.

6. The energy storage actuator according to claim 5, characterized in that, The locking member (7) is a steel ball.

7. The energy storage actuator according to claim 5, characterized in that, A D-shaped shaft-hole mating structure is provided between the piston rod (9) and the outer cylinder (1).

8. The energy storage actuator according to claim 5, wherein, The unlocking mechanism includes a second motor (11), a second lead screw (4), and a second nut (5); The second lead screw (4) is sleeved outside the first lead screw (3) and is fixedly connected to the outer cylinder (1); The second nut (5) is threadedly connected to the second lead screw (4); One end of the second nut (5) abuts against the bushing (6); The second motor (11) drives the second nut (5) to rotate and move axially along the second lead screw (4).

9. The energy storage actuator according to claim 8, wherein, The second motor (11) cooperates with the second nut (5) through a gear.

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