Electric push rod with power-off self-locking function

Abstract

The utility model discloses an electric push rod with power-off self-locking function, which comprises a sleeve, a control cylinder, an electromagnet, a metal block and a pressing spring. A non-through circular hole is arranged on the inner side of an outer rod and is movably connected with an extension rod with four sliding grooves to realize axial sliding guidance. The sleeve is fixed to the outer side of the outer rod, and a control cylinder is embedded in the through circular hole on the surface of the sleeve. The electromagnet is installed on the top of the cylinder, and the metal block is slidably connected to the bottom of the cylinder. The metal block is fixedly connected to a pressing plate through a connecting shaft, and the pressing plate can move along the rectangular notch of the outer rod. When power is supplied, the electromagnet attracts the metal block, the pressing spring is compressed, the pressing plate is separated from the extension rod, and the push rod can freely extend and retract. When power is cut off, the electromagnet loses magnetism, the pressing spring resets and pushes the metal block downward, the pressing plate is pressed into the sliding groove of the extension rod to form mechanical clamping, and self-locking is realized. Through electromagnetic-spring linkage, the design can ensure that the push rod is immediately locked after power is cut off, prevent the load from sliding down, ensure safe and stable operation, prolong the service life of the equipment, and the like.

Description

Technical Field

[0001] This utility model relates to the field of electric linear actuator technology, specifically an electric linear actuator with a power-off self-locking function. Background Technology

[0002] An electric linear actuator is a mechanical device that converts the rotary motion of an electric motor into linear reciprocating motion, achieving precise displacement control through electric drive. It combines a motor, transmission mechanism (such as gears or lead screws), and guide components, and is widely used in scenarios requiring automated linear motion.

[0003] To ensure the stability of the electric linear actuator, it needs to be self-locking when power is off. This is mainly to ensure that the equipment maintains its current position when power is off or the motor stops running, preventing accidental movement caused by external forces (such as gravity or load reaction forces), thereby ensuring safe and stable operation and extending the equipment's lifespan. Utility Model Content

[0004] This utility model provides an electric push rod with a power-off self-locking function, which can automatically lock itself when the electric push rod is powered off, so as to ensure safe and stable operation and extend the service life of the equipment.

[0005] To achieve the above objectives, an electric push rod with a power-off self-locking function is provided, comprising a telescopic rod and a power-off self-locking device. The power-off self-locking device includes a sleeve, a bracket, a control cylinder, an electromagnet, a metal block, a spring seat A, a connecting shaft, a pressing spring, a spring seat B, and a pressing plate. A non-through circular hole is formed on the inner surface of the outer rod. The telescopic rod is movably connected to the inner surface of the outer rod. Four sliding grooves are formed on the outer surface of the telescopic rod. The outer rod is fixedly connected to the inner surface of the sleeve, and the inner surface of the outer rod is movably connected to the outer surface of the telescopic rod. The outer surface of the sleeve has multiple through-holes. Near the bottom of the through-holes on the outer rod is a rectangular slot. The inner surfaces of the through-holes on the sleeve are fixedly connected to the outer surface of the control cylinder. The top inner surface of the control cylinder is fixedly connected to an electromagnet. The inner surface of the control cylinder is slidably connected to the outer surface of a metal block. The bottom surface of the metal block is fixedly connected to the top surface of a connecting shaft. The bottom surface of the connecting shaft is fixedly connected to the top of a pressing plate. The pressing plate is movably connected to the inner surface of the rectangular slot on the outer rod. The electromagnet and metal block are designed so that when the electromagnet is energized, it attracts the metal block, thereby raising the pressing plate connected to the metal block via the connecting shaft. This allows the electric push rod to release its self-locking mechanism when energized.

[0006] According to the electric push rod with a power-off self-locking function, a spring seat A is fixedly connected to the inner surface of the control cylinder. The bottom surface of the spring seat A is fixedly connected to a pressing spring, and the bottom surface of the pressing spring is fixedly connected to a spring seat B. Both spring seat A and spring seat B have through holes on their top surfaces. The inner surface of the through hole in spring seat A is movably connected to the outer surface of a connecting shaft. The inner surface of the through hole in spring seat B is fixedly connected to the outer surface of the connecting shaft. The outer surface of spring seat B can slide against the inner surface of the control cylinder. The bottom surface of the pressing plate can be in close contact with the inner bottom surface of the sliding groove of the telescopic rod. The spring seat A is provided for easy installation of the pressing spring. The pressing spring, in cooperation with spring seat B and the connecting shaft, presses the pressing plate, achieving self-locking upon power failure.

[0007] According to the electric push rod with a power-off self-locking function, multiple retainers are fixedly connected to the inner surface of the outer rod, and the outer surfaces of the multiple retainers can be slidably connected to the inner surfaces of multiple grooves on the telescopic rod. The retainers are provided to prevent the telescopic rod from rotating with the threaded rod when it rotates, while simultaneously coordinating with the rotation of the threaded rod to achieve the telescopic movement of the telescopic rod.

[0008] According to the electric push rod with a power-off self-locking function, the end of the outer rod away from the telescopic rod is fixedly connected to the housing. A drive shaft is rotatably connected to the inner surface of the housing. A through-hole is opened at the end of the outer rod away from the telescopic rod and near the drive shaft. A threaded rod is rotatably connected to the inner surface of the through-hole of the outer rod. A non-through-hole threaded groove is opened at the end of the telescopic rod. The outer surface of the threaded rod can mesh with the inner surface of the non-through-hole threaded groove of the telescopic rod. The threaded rod is designed to allow the telescopic rod to extend and retract under the mutual meshing transmission with the threaded groove inside the telescopic rod.

[0009] According to the electric push rod with a power-off self-locking function, a gear A is fixedly connected to the outer surface of the drive shaft, and a drive motor is fixedly connected to the inner surface of the housing. The output end of the drive motor is fixedly connected to gear B, and the tooth surface of gear B can mesh with the tooth surface of gear A. The drive motor is set to drive the rotation of gear B, and then drive the rotation of the threaded rod through the meshing transmission between gear B and gear A, thereby driving the extension and retraction of the telescopic rod.

[0010] According to the electric push rod with power-off self-locking function, the outer surface of the sleeve is fixedly connected to the bracket near the control cylinder. The inner top surface of the bracket has multiple circular slots, and the inner surfaces of these slots are all fixedly connected to the outer top surface of the control cylinder. The bracket is used to enhance the structural strength of the entire power-off self-locking device.

[0011] According to the electric push rod with power-off self-locking function, the outer surface of the chassis has heat dissipation vents. These vents facilitate heat dissipation from the internal drive motor, optimizing its working environment and increasing its operational stability and service life.

[0012] The beneficial effects of this utility model are: by setting a power-off self-locking device, it can automatically lock itself when the electric push rod is powered off, so as to ensure safe and stable operation and extend the service life of the equipment.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a perspective view of the external structure of an electric push rod with a power-off self-locking function according to this utility model. Figure 2 This utility model discloses a three-dimensional internal structure of an electric push rod with a power-off self-locking function. Figure 1 ; Figure 3 This utility model discloses a three-dimensional internal structure of an electric push rod with a power-off self-locking function. Figure 2 ; Figure 4 This is a front view of the internal structure of an electric push rod with a power-off self-locking function according to this utility model; Figure 5 This utility model Figure 4 Enlarged view of A in the middle; Figure 6 This is a left view of the external structure of an electric push rod with a power-off self-locking function according to this utility model.

[0015] Legend: 1. Chassis; 2. Outer rod; 3. Cage; 4. Power-off self-locking device; 401. Sleeve; 402. Bracket; 403. Control cylinder; 404. Electromagnet; 405. Metal block; 406. Spring seat A; 407. Connecting shaft; 408. Pressing spring; 409. Spring seat B; 410. Pressing plate; 5. Telescopic rod; 6. Threaded rod; 7. Gear A; 8. Drive shaft; 9. Drive motor; 10. Gear B; 11. Heat dissipation vent. Detailed Implementation

[0016] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0017] Reference Figures 1 to 6 This utility model provides an electric push rod with a power-off self-locking function, comprising a telescopic rod 5 and a power-off self-locking device 4. The power-off self-locking device 4 includes a sleeve 401, a bracket 402, a control cylinder 403, an electromagnet 404, a metal block 405, a spring seat A 406, a connecting shaft 407, a pressing spring 408, a spring seat B 409, and a pressing plate 410. A non-through circular hole is formed on the inner surface of the outer rod 2, and the telescopic rod 5 is movably connected to the inner surface of the outer rod 2. Four sliding grooves are formed on the outer surface of the telescopic rod 5. The outer rod 2 is fixedly connected to the inner surface of the sleeve 401, and the inner surface of the outer rod 2 is movably connected to the outer surface of the telescopic rod 5. The outer surface of the sleeve 401 has multiple through holes. The outer rod 2 has a rectangular slot near the bottom of the through holes of the sleeve 401. The inner surfaces of the through holes of the sleeve 401 are fixedly connected to the outer surface of the control cylinder 403. The inner top surface of the control cylinder 403 is fixedly connected to the electromagnet 404. The inner surface of the control cylinder 403 is slidably connected to the outer surface of the metal block 405. The bottom surface of the metal block 405 is fixedly connected to the top surface of the connecting shaft 407. The bottom surface of the connecting shaft 407 is fixedly connected to the top of the pressing plate 410. The pressing plate 410 is movably connected to the inner surface of the rectangular slot of the outer rod 2.

[0018] To optimize the self-locking performance of the electric actuator, it is recommended to use a triangular thread with the best self-locking performance for the threaded rod 6.

[0019] A spring seat A406 is fixedly connected to the inner surface of the control cylinder 403. The bottom surface of the spring seat A406 is fixedly connected to the pressing spring 408. The bottom surface of the pressing spring 408 is fixedly connected to the spring seat B409. Both the top surfaces of the spring seat A406 and the spring seat B409 have through holes. The inner surface of the through hole of the spring seat A406 is movably connected to the outer surface of the connecting shaft 407. The inner surface of the through hole of the spring seat B409 is fixedly connected to the outer surface of the connecting shaft 407. The outer surface of the spring seat B409 can be slidably connected to the inner surface of the control cylinder 403. The bottom surface of the pressing plate 410 can be in close contact with the inner bottom surface of the slide groove of the telescopic rod 5.

[0020] Multiple retainers 3 are fixedly connected to the inner surface of the outer rod 2, and the outer surfaces of the multiple retainers 3 can be slidably connected to the inner surfaces of multiple sliding grooves on the telescopic rod 5.

[0021] The end of the outer rod 2 away from the telescopic rod 5 is fixedly connected to the housing 1. The inner surface of the housing 1 is rotatably connected to the drive shaft 8. A through circular hole is opened at the end of the outer rod 2 away from the telescopic rod 5 and close to the drive shaft 8. A threaded rod 6 is rotatably connected to the inner surface of the through circular hole of the outer rod 2. A non-through threaded groove is opened at the end of the telescopic rod 5. The outer surface of the threaded rod 6 can mesh with the inner surface of the non-through threaded groove of the telescopic rod 5.

[0022] Gear A7 is fixedly connected to the outer surface of drive shaft 8, and drive motor 9 is fixedly connected to the inner surface of housing 1. The output end of drive motor 9 is fixedly connected to gear B10, and the tooth surface of gear B10 can mesh with the tooth surface of gear A7.

[0023] A servo motor is recommended for drive motor 9. A servo motor can adjust the speed and direction of the motor by receiving control signals, so as to achieve precise position control and motion control, which meets the high precision requirements of our organization for drive motor 9.

[0024] The outer surface of the sleeve 401 is fixedly connected to the bracket 402 near the position of the control cylinder 403. The inner top surface of the bracket 402 has multiple circular slots, and the inner surfaces of the multiple circular slots of the bracket 402 are fixedly connected to the outer top surface of the control cylinder 403.

[0025] The outer surface of the chassis 1 has a heat dissipation vent 11.

[0026] Working principle: In use, when the electric push rod needs to extend or retract, it is energized, driving motor 9. Motor 9 drives gear B10, which in turn drives gear A7 through meshing transmission. Gear A7 drives the threaded rod 6 to rotate, and the rotation of the threaded rod 6, through its meshing transmission with the telescopic rod 5, completes the extension or retraction action. At the same time, electromagnet 404 is energized and activated, attracting metal block 405. The attraction of metal block 405 causes connecting shaft 407 to rise, thereby raising the pressing plate 410 fixedly connected to it. The raising of pressing plate 410 releases the pressure on the outer surface of telescopic rod 5, thus achieving automatic release of self-locking of the electric push rod when energized, avoiding interference with the normal movement of telescopic rod 5. When the electric push rod is de-energized, the drive motor 9 stops rotating and the threaded rod 6 stops rotating. The electromagnet 404 stops attracting the metal block 405. Then, the released pressing plate 410 will press the outer surface of the telescopic rod 5 under the pressure of the pressing spring 408 to prevent it from sliding and realize the power-off locking of the electric push rod.

[0027] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An electric linear actuator with a power-off self-locking function, characterized in that, The device includes a telescopic rod (5) and a power-off self-locking device (4). The power-off self-locking device (4) includes a sleeve (401), a bracket (402), a control cylinder (403), an electromagnet (404), a metal block (405), a spring seat A (406), a connecting shaft (407), a pressing spring (408), a spring seat B (409), and a pressing plate (410). The inner surface of the outer rod (2) has a non-through circular hole. The inner surface of the outer rod (2) is movably connected to the telescopic rod (5). The outer surface of the telescopic rod (5) has four sliding grooves. The inner surface of the sleeve (401) is fixedly connected to the outer rod (2). The inner surface of the outer rod (2) is movably connected to the outer surface of the telescopic rod (5). The outer surface of the rod (2) has multiple through holes. The outer rod (2) has a rectangular slot near the bottom of the through holes of the sleeve (401). The inner surfaces of the through holes of the sleeves (401) are fixedly connected to the outer surface of the control cylinder (403). The inner top surface of the control cylinder (403) is fixedly connected to the electromagnet (404). The inner surface of the control cylinder (403) is slidably connected to the outer surface of the metal block (405). The bottom surface of the metal block (405) is fixedly connected to the top surface of the connecting shaft (407). The bottom surface of the connecting shaft (407) is fixedly connected to the top of the pressing plate (410). The pressing plate (410) is movably connected to the inner surface of the rectangular slot of the outer rod (2).

2. The electric push rod with power-off self-locking function according to claim 1, characterized in that, The inner surface of the control cylinder (403) is fixedly connected to a spring seat A (406). The bottom surface of the spring seat A (406) is fixedly connected to a pressing spring (408). The bottom surface of the pressing spring (408) is fixedly connected to a spring seat B (409). The top surfaces of the spring seat A (406) and the spring seat B (409) are both provided with through holes. The inner surface of the through hole of the spring seat A (406) is movably connected to the outer surface of the connecting shaft (407). The inner surface of the through hole of the spring seat B (409) is fixedly connected to the outer surface of the connecting shaft (407). The outer surface of the spring seat B (409) can be slidably connected to the inner surface of the control cylinder (403). The bottom surface of the pressing plate (410) can be in close contact with the inner bottom surface of the groove of the telescopic rod (5).

3. An electric push rod with a power-off self-locking function according to claim 1, characterized in that, The inner surface of the outer rod (2) is fixedly connected with a plurality of retainers (3), and the outer surfaces of the plurality of retainers (3) can be slidably connected to the inner surfaces of the plurality of grooves on the telescopic rod (5).

4. An electric push rod with a power-off self-locking function according to claim 1, characterized in that, The outer rod (2) is fixedly connected to the housing (1) at the end away from the telescopic rod (5). The inner surface of the housing (1) is rotatably connected to the drive shaft (8). A through hole is opened at the end of the outer rod (2) away from the telescopic rod (5) and close to the drive shaft (8). A threaded rod (6) is rotatably connected to the inner surface of the through hole of the outer rod (2). A non-through threaded groove is opened at the end of the telescopic rod (5). The outer surface of the threaded rod (6) can mesh with the inner surface of the non-through threaded groove of the telescopic rod (5).

5. An electric push rod with a power-off self-locking function according to claim 4, characterized in that, Gear A (7) is fixedly connected to the outer surface of the drive shaft (8), and drive motor (9) is fixedly connected to the inner surface of the housing (1). The output end of drive motor (9) is fixedly connected to gear B (10), and the tooth surface of gear B (10) can mesh with the tooth surface of gear A (7).

6. An electric push rod with a power-off self-locking function according to claim 1, characterized in that, The outer surface of the sleeve (401) is fixedly connected to the bracket (402) near the position of the control cylinder (403). The inner top surface of the bracket (402) has multiple circular slots, and the inner surfaces of the multiple circular slots of the bracket (402) are fixedly connected to the outer top surface of the control cylinder (403).

7. An electric push rod with a power-off self-locking function according to claim 4, characterized in that, The outer surface of the chassis (1) has a heat dissipation vent (11).

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