Electric push rod with reset function

Abstract

The utility model discloses an electric push rod with a reset function, relates to the technical field of electric push rods, and aims to provide an electric push rod with a reset function, which can be automatically reset under the condition of complete power failure, and has the technical key points that the electric push rod comprises a cylinder body, a ball screw is arranged in the cylinder body, a ball nut in linear sliding connection with the inner wall of the cylinder body is connected to the ball screw in a matched mode, a telescopic rod which is arranged on the ball screw in a sleeving mode and penetrates through the top end of the cylinder body is arranged on the ball nut, a protection box is arranged below the cylinder body, and a self-locking transmission component arranged on the ball screw in a sleeving mode is arranged in the protection box. The self-locking device has the technical effects that by arranging the self-locking transmission part and the electromagnetic locking part, when power failure occurs, the electromagnetic locking part is disconnected with the ball screw, at the moment, the ball screw is not connected with the self-locking transmission part any more, the ball screw loses the self-locking effect, and the telescopic rod slides downwards to be reset under the action of gravity.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, specifically an electric actuator with a reset function. Background Technology

[0002] An electric linear actuator is an electrically driven device that converts the rotary motion of an electric motor into the linear reciprocating motion of a linear actuator. It mainly consists of a motor, a linear actuator, a control device, and a transmission device. The forward and reverse rotation of the motor drives the transmission device, thereby extending or retracting the linear actuator to achieve linear displacement output. In some special application scenarios, it is necessary to automatically reset the electric linear actuator after power failure to ensure the smooth operation of subsequent processes and prevent the linear actuator from stopping halfway. However, the existing methods all use a power supply, which is essentially still based on electricity. When a circuit failure occurs due to a motor malfunction, the electric linear actuator cannot be reset. Utility Model Content

[0003] (1) Technical problems solved

[0004] To address the shortcomings of existing technologies, this utility model provides an electric actuator with a reset function that can automatically reset in the event of a complete power outage.

[0005] (2) Technical solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: an electric actuator with a reset function, comprising a cylinder body, a ball screw rotatably mounted inside the cylinder body, a ball nut linearly slidingly connected to the inner wall of the cylinder body and fitted onto the ball screw, a telescopic rod sleeved on the ball screw and passing through the top of the cylinder body on the ball nut, a protective box below the cylinder body, a self-locking transmission component sleeved on the ball screw inside the protective box, a motor connected to the self-locking transmission component on the outside of the protective box, and an electromagnetic locking component fixedly connected to the self-locking transmission component and engaging with the ball screw, the electromagnetic locking component being connected to the ball screw when energized and disconnected from the ball screw when de-energized.

[0007] Preferably, the self-locking transmission component includes a rotating shaft disposed inside a protective box, a worm gear disposed on the rotating shaft, the worm gear being sleeved under a ball screw, a worm engaging on the side of the worm gear, and the worm being connected to a motor.

[0008] Preferably, the electromagnetic locking component includes a sleeve fixedly connected to the worm gear, the sleeve being sleeved on the side of the ball screw, and a solenoid valve inserted into the ball screw inside the sleeve. The solenoid valve is inserted into the ball screw when energized and separated from the ball screw when de-energized.

[0009] Preferably, the sleeve is provided with a conductive ring electrically connected to the solenoid valve, and the protective box is provided with a conductive transmission component that fits into the conductive ring.

[0010] Preferably, an insulating partition is provided between the conductive coils to prevent short circuits between them.

[0011] Preferably, the conductive transmission component includes a support frame disposed inside a protective box, a slide rod disposed on the support frame, a pressure plate slidably disposed on the slide rod, a carbon brush slidably engaged with the support frame under the pressure plate, and a second spring sleeved on the side of the slide rod to apply downward pressure to the pressure plate.

[0012] Preferably, the protective box has a heat dissipation vent on its side, a cooling fan is installed inside the heat dissipation vent, and a grille is provided on the outside of the heat dissipation vent.

[0013] Preferably, the cylinder body is provided with a first spring, the top end of the first spring is connected to the telescopic rod, and applies a pulling force to the telescopic rod.

[0014] (3) Beneficial effects

[0015] Compared with the prior art, this utility model provides an electric actuator with a reset function, which has the following advantages:

[0016] 1. By setting up a self-locking transmission component and an electromagnetic locking component, during normal operation, the electromagnetic locking component connects the self-locking transmission component to the ball screw, allowing it to rotate using the driving force of the motor, and utilizes the structural characteristics of the self-locking transmission component to achieve a self-locking effect. When a power failure occurs, the electromagnetic locking component disconnects from the ball screw, and the ball screw is no longer connected to the self-locking transmission component, causing the ball screw to lose its self-locking effect. This allows the telescopic rod to slide downwards and reset under the action of gravity, achieving the effect of resetting without the need for a backup power supply.

[0017] 2. By setting a first spring, the first spring applies a pulling force to the telescopic rod. When the telescopic rod extends, it will stretch the first spring, so that the first spring is in a stretched and stored energy state. When the electromagnetic locking component is de-energized, the ball screw loses its self-locking effect and is reset by the downward gravity of the telescopic rod. At this time, the first spring will release its own elastic potential energy and pull the telescopic rod back to its original position. In this way, the device can still maintain an effective self-locking effect when installed upside down. Attached Figure Description

[0018] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the cylinder block of this utility model;

[0020] Figure 3 This is a three-dimensional schematic diagram of the electromagnetic locking component of this utility model;

[0021] Figure 4 This is a three-dimensional schematic diagram of the conductive transmission component of this utility model.

[0022] In the diagram: 1. Cylinder body; 2. Telescopic rod; 3. Protective box; 4. Motor; 5. First spring; 6. Grille; 7. Self-locking transmission component; 701. Worm gear; 702. Rotating shaft; 703. Worm wheel; 8. Electromagnetic locking component; 801. Sleeve; 802. Solenoid valve; 803. Conductive ring; 804. Insulating partition; 9. Conductive transmission component; 901. Support frame; 902. Slide rod; 903. Pressure plate; 904. Carbon brush; 905. Second spring; 10. Cooling fan; 11. Heat dissipation port; 12. Ball screw; 13. Ball nut. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 An electric actuator with a reset function includes a cylinder body 1, a ball screw 12 rotatably mounted inside the cylinder body 1, a ball nut 13 connected to the ball screw 12 and linearly slidingly connected to the inner wall of the cylinder body 1, a telescopic rod 2 sleeved on the ball screw 12 and passing through the top of the cylinder body 1 on the ball nut 13, a protective box 3 at the bottom of the cylinder body 1, a self-locking transmission component 7 sleeved on the ball screw 12 inside the protective box 3, a motor 4 connected to the self-locking transmission component 7 on the outside of the protective box 3, an electromagnetic locking component 8 fixedly connected to the self-locking transmission component 7 and engaging with the ball screw 12, the electromagnetic locking component 8 being connected to the ball screw 12 when energized and disconnected from the ball screw 12 when de-energized;

[0025] In this invention, a self-locking transmission component 7 and an electromagnetic locking component 8 are provided. During normal operation, the electromagnetic locking component 8 connects the self-locking transmission component 7 to the ball screw 12, allowing it to rotate using the driving force of the motor 4, and utilizes the structural characteristics of the self-locking transmission component 7 to achieve a self-locking effect. When a power outage occurs, the electromagnetic locking component 8 disconnects from the ball screw 12. At this time, the ball screw 12 is no longer connected to the self-locking transmission component 7, causing the ball screw 12 to lose its self-locking effect, and the telescopic rod 2 slides downward and resets under the action of gravity, achieving the effect of resetting without the need for a backup power supply.

[0026] The self-locking transmission component 7 includes a rotating shaft 702 located inside the protective box 3. A worm gear 703 is provided on the rotating shaft 702. The worm gear 703 is sleeved under the ball screw 12. A worm 701 is meshed on the side of the worm gear 703. The worm 701 is connected to the motor 4.

[0027] By setting up worm gear 703 and worm 701, worm gear 703 and worm 701 have the effects of speed reduction and self-locking while transmitting power, which can drive ball screw 12 to rotate precisely, so as to achieve the purpose of accurately controlling the movement of telescopic rod 2. In addition, this method makes the ball screw 12, which does not have the self-locking effect, run stably and firmly. Using ball screw 12 to replace the traditional screw with the self-locking effect has the advantages of higher operating efficiency, less friction and higher operating accuracy.

[0028] The electromagnetic locking component 8 includes a sleeve 801 fixedly connected to the worm gear 703. The sleeve 801 is sleeved on the side of the ball screw 12. The sleeve 801 is provided with a solenoid valve 802 that is inserted into the ball screw 12. The solenoid valve 802 is inserted into the ball screw 12 when it is energized and separated from the ball screw 12 when it is de-energized.

[0029] By setting up a sleeve 801 and a solenoid valve 802, the sleeve 801 is fixed on the worm gear 703 and rotates with the worm gear 703. When normally energized, the solenoid valve 802 engages with the ball screw 12. At this time, the worm gear 703 can drive the ball screw 12 to move through the sleeve 801 and the solenoid valve 802. The self-locking characteristics of the worm gear 703 and the worm 701 ensure the stable movement of the ball screw 12. When the solenoid valve 802 is unexpectedly de-energized, it will disconnect from the ball screw 12. At this time, the ball screw 12 is no longer connected to the sleeve 801 and the worm gear 703, which makes it impossible for the worm gear 703 and the worm 701 to lock the ball screw 12, allowing the ball screw 12 to reset after being subjected to force.

[0030] The sleeve 801 is provided with a conductive ring 803 that is electrically connected to the solenoid valve 802. The protective box 3 is provided with a conductive transmission component 9 that fits with the conductive ring 803. The conductive transmission component 9 includes a support frame 901 provided in the protective box 3. The support frame 901 is provided with a slide rod 902. A pressure plate 903 is slidably provided on the slide rod 902. A carbon brush 904 that slides and cooperates with the support frame 901 is provided under the pressure plate 903. A second spring 905 that applies downward pressure to the pressure plate 903 is sleeved on the side of the slide rod 902.

[0031] By setting a second spring 905 and a carbon brush 904, the second spring 905 can pull down the pressure plate 903, so that the pressure plate 903 presses the carbon brush 904 onto the conductive ring 803, so that effective power supply can still be maintained when the sleeve 801 and the solenoid valve 802 are rotating, and the pressure of the second spring 905 can make the carbon brush 904 replenished in time after wear.

[0032] An insulating partition 804 is provided between the conductive coils 803 to prevent short circuits between the conductive coils 803.

[0033] By setting an insulating partition 804, the conductive rings 803 can be separated, preventing the powder generated by the wear of the carbon brush 904 from causing short circuits in the conductive rings 803, thus ensuring the safety and stability of the power supply. In addition, it can also prevent electric arcing from occurring between adjacent conductive rings 803.

[0034] The protective box 3 has a heat dissipation vent 11 on its side, a cooling fan 10 inside the heat dissipation vent 11, and a grille 6 on the outside of the heat dissipation vent 11.

[0035] By setting up a cooling fan 10, the hot air inside the protective box 3 can be exhausted, so that the solenoid valve 802 can dissipate its own heat in a timely manner when working for a long time, preventing heat from accumulating inside the protective box 3 and affecting the normal operation and service life of the solenoid valve 802.

[0036] A first spring 5 is provided on the cylinder body 1. The top end of the first spring 5 is connected to the telescopic rod 2 and applies a pulling force to the telescopic rod 2.

[0037] By setting a first spring 5, the first spring 5 applies a pulling force to the telescopic rod 2. When the telescopic rod 2 extends, it will stretch the first spring 5, so that the first spring 5 is in a stretched energy storage state. When the electromagnetic locking component 8 is de-energized, the ball screw 12 loses its self-locking effect and is reset by the downward gravity of the telescopic rod 2. At this time, the first spring 5 will release its own elastic potential energy and pull the telescopic rod 2 back to its original position. In this way, the device can still maintain an effective self-locking effect when installed upside down.

[0038] Working principle: When a power failure occurs, the solenoid valve 802 closes. At this time, the sleeve 801 is disconnected from the ball screw 12, and the worm gear 703 and worm 701 are no longer engaged with the ball screw 12. In this state, the telescopic rod 2 moves into the cylinder 1 by gravity and the tension of the first spring 5. When the telescopic rod 2 retracts into the cylinder 1, it will drive the ball nut 13 to move. The ball nut 13 will drive the unlocked ball screw 12 to rotate, achieving the effect of automatic reset.

[0039] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. An electric actuator with a reset function, comprising a cylinder (1), characterized in that: A ball screw (12) is rotatably mounted inside the cylinder (1). A ball nut (13) is connected to the ball screw (12) and slides linearly with the inner wall of the cylinder (1). A telescopic rod (2) is mounted on the ball screw (12) and passes through the top of the cylinder (1). A protective box (3) is provided below the cylinder (1). A self-locking transmission component (7) is mounted on the ball screw (12) inside the protective box (3). A motor (4) connected to the self-locking transmission component (7) is provided on the outside of the protective box (3). An electromagnetic locking component (8) is fixedly connected to the self-locking transmission component (7) and engages with the ball screw (12). The electromagnetic locking component (8) is connected to the ball screw (12) when energized and disconnected from the ball screw (12) when de-energized.

2. The electric actuator with a reset function according to claim 1, characterized in that: The self-locking transmission component (7) includes a rotating shaft (702) located inside the protective box (3). A worm gear (703) is provided on the rotating shaft (702). The worm gear (703) is sleeved under the ball screw (12). A worm (701) is engaged on the side of the worm gear (703). The worm (701) is connected to the motor (4).

3. The electric actuator with a reset function according to claim 2, characterized in that: The electromagnetic locking component (8) includes a sleeve (801) fixedly connected to the worm gear (703). The sleeve (801) is sleeved on the side of the ball screw (12). The sleeve (801) is provided with a solenoid valve (802) that is inserted into the ball screw (12). The solenoid valve (802) is inserted into the ball screw (12) when energized and separated from the ball screw (12) when de-energized.

4. The electric actuator with a reset function according to claim 3, characterized in that: The sleeve (801) is provided with a conductive ring (803) electrically connected to the solenoid valve (802), and the protective box (3) is provided with a conductive transmission component (9) that fits into the conductive ring (803).

5. An electric actuator with a reset function according to claim 4, characterized in that: An insulating partition (804) is provided between the conductive coils (803) to prevent short circuits between the conductive coils (803).

6. An electric actuator with a reset function according to claim 4, characterized in that: The conductive transmission component (9) includes a support frame (901) disposed inside the protective box (3), a slide rod (902) provided on the support frame (901), a pressure plate (903) slidably disposed on the slide rod (902), a carbon brush (904) slidably engaged with the support frame (901) under the pressure plate (903), and a second spring (905) sleeved on the side of the slide rod (902) to apply downward pressure to the pressure plate (903).

7. The electric actuator with a reset function according to claim 1, characterized in that: The protective box (3) has a heat dissipation vent (11) on its side, a cooling fan (10) is provided inside the heat dissipation vent (11), and a grille (6) is provided on the outside of the heat dissipation vent (11).

8. An electric actuator with a reset function according to claim 1, characterized in that: The cylinder (1) is provided with a first spring (5), the top end of the first spring (5) is connected to the telescopic rod (2), and applies a pulling force to the telescopic rod (2).

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