Electric linear actuator

Abstract

The utility model discloses an electric linear actuator, which belongs to the technical field of industrial automation and comprises a main body upper end cover, a motor is arranged at the rear end of the main body upper end cover, a main body bottom cover is mounted on the motor, a ball screw is arranged on a main shaft of the motor, and a ball screw nut in threaded connection with the ball screw is arranged on the ball screw. A horizontally-arranged sliding rail is arranged between the motor and the upper end cover of the main body, a sliding block in sliding fit with the sliding rail is arranged on the sliding rail, a back plate is horizontally connected to the sliding block, and the ball screw nut is connected with the sliding block. The electric linear actuator is controllable in stroke and controllable in force, and the defects of a traditional air cylinder are overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial automation, and particularly relates to an electric linear actuator. Background Art

[0002] In modern industrial production, such as industries like automobile manufacturing and electronic product manufacturing, the requirement for precise position control of production equipment is getting higher and higher. For example, in an automobile body welding production line, it is necessary to accurately position the welding torch of a welding robot to each part of the body for welding operations. An electric linear actuator can accurately move a load to a specified position according to the instructions of a control system, and its positioning accuracy can reach the millimeter or even micron level, meeting the requirements for precise position control in industrial production.

[0003] However, the working principle of the current linear transmission mechanism, which is mainly a pneumatic system with pneumatic cylinders, is based on the pressure of compressed air to push the piston to move, thereby achieving linear transmission. However, the pressure of compressed air is easily affected by various factors, such as fluctuations in the air source pressure, changes in pipeline resistance, and changes in the internal friction of the cylinder. Due to the difficulty in precisely controlling these factors, there is a large uncertainty in the magnitude of the output force of the cylinder. In some application scenarios with high requirements for force precision, such as in the precise assembly process where a certain pressure needs to be accurately applied to complete the press-fitting of parts, or in material testing where the magnitude of the applied force needs to be accurately controlled to obtain accurate test data, pneumatic cylinders are difficult to meet the requirements.

[0004] Moreover, an air source reserve is required. The air source is the key to providing compressed air, which means that the places where pneumatic cylinders are used must be equipped with corresponding air source equipment, such as air compressors, air storage tanks, etc. The air source equipment not only occupies a certain space but also requires regular maintenance and management, increasing the equipment cost and operating cost. Summary of the Utility Model

[0005] The embodiment of the utility model provides an electric linear actuator to solve the problems in the prior art.

[0006] The embodiment of the utility model adopts the following technical scheme: an electric linear actuator, including an upper end cover of the main body, a motor is arranged at the rear end of the upper end cover of the main body, a bottom cover of the main body is installed on the motor, a ball screw is arranged on the main shaft of the motor, a ball screw nut threadedly connected with the ball screw is arranged on the ball screw, a horizontally arranged slide rail is arranged between the motor and the upper end cover of the main body, a slide block slidably matched with the slide rail is arranged on the slide rail, a back plate is horizontally connected to the slide block, and the ball screw nut is connected with the slide block.

[0007] Preferably, a protruding limit block is arranged on the back plate and is located on the side close to the bottom cover of the main body.

[0008] Preferably, an origin sensor is provided on the upper end cover of the main body.

[0009] Preferably, a retraction limit sensor is provided on the upper end cover of the main body.

[0010] Preferably, a sliding groove for the ball screw nut to slide is provided on the slide rail, and a sliding groove for the ball screw nut to slide is provided on the upper end cover of the main body.

[0011] Preferably, the back plate is arranged in an L shape.

[0012] Preferably, an induction post is provided on one side of the back plate close to the upper end cover of the main body.

[0013] Preferably, an extension rod is provided on the back plate, the extension rod is slidably connected in the ball screw and is also slidably matched with the ball screw.

[0014] The above at least one technical solution adopted in the embodiment of the present utility model can achieve the following beneficial effects:

[0015] First, during the use of the present utility model, the motor works to drive the ball screw to rotate, thereby driving the ball screw nut to perform a linear horizontal movement, thereby driving the slider to move on the slide rail, which will drive the back plate to move horizontally. The linear movement of the ball screw drives the back plate to perform a linear movement to push, pull or lift the material. The stroke and force of this electric linear actuator are controllable, solving the shortcomings of traditional cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1 is a three-dimensional structural diagram of the present utility model;

[0018] Figure 2 is a three-dimensional structural exploded view of the present utility model;

[0019] Reference Numerals

[0020] Upper end cover of the main body 1, motor 2, bottom cover of the main body 3, ball screw 4, ball screw nut 5, slide rail 6, slider 7, back plate 8, retraction limit block 9, origin sensor 10, limit sensor 11, sliding groove 12, sliding groove 13, induction post 14, extension rod 15. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with specific embodiments of the present utility model and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the scope of protection of the present utility model.

[0022] The following will, with reference to the drawings, elaborate on the technical solutions provided by each embodiment of the present utility model.

[0023] Refer to Figures 1 to 2 As shown, an embodiment of the present utility model provides an electric linear actuator, which includes a main body upper end cover 1. A motor 2 is provided at the rear end of the main body upper end cover 1. A main body bottom cover 3 is installed on the motor 2. A ball screw 4 is provided on the main shaft of the motor 2. A ball screw nut 5 is provided on the ball screw 4 and is threadedly connected thereto. A horizontally arranged slide rail 6 is provided between the motor 2 and the main body upper end cover 1. A slider 7 is provided on the slide rail 6 and is slidably matched therewith. A back plate 8 is horizontally connected to the slider 7. The ball screw nut 5 is connected to the slider 7.

[0024] During use, the motor 2 operates to drive the ball screw 4 to rotate, thereby driving the ball screw nut 5 to move linearly and horizontally, thus driving the slider 7 to move on the slide rail 6, and then driving the back plate 8 to move horizontally. The linear motion of the ball screw 4 drives the back plate 8 to perform linear motion to push, pull or lift materials. The stroke and force of this electric linear actuator are controllable, solving the shortcomings of traditional cylinders.

[0025] The transmission between the ball screw 4 and the ball screw nut 5 is achieved through the rolling of balls. Since the balls are in good contact with the raceways of the screw and the nut, and the rolling friction coefficient of the balls is extremely small, the movement of the nut on the screw is extremely stable.

[0026] The structural design of the ball screw 4 enables the movement trajectory of the nut to be highly repeatable each time the ball screw 4 rotates to drive the nut to move. This is crucial for automated equipment that needs to repeat the same action multiple times, such as the part grasping and installation devices on an automated assembly line. In each operation, the ball screw nut 5 can accurately reach the predetermined position, ensuring the consistency and accuracy of the assembly process and reducing the defective rate of products.

[0027] In a specific embodiment, an extended limit block 9 is provided on the back plate 8 and is located on the side close to the main body bottom cover 3; a home sensor 10 is provided on the main body upper end cover 1; an extended limit sensor 11 is provided on the main body upper end cover 1; an induction column 14 is provided on the side of the back plate 8 close to the main body upper end cover 1.

[0028] Origin position: The sensing post 14 moves on the back plate 8, and the back plate 8 moves linearly under the drive of the motor 2. During this process, the origin sensor 10 plays a key role in precise detection. When the back plate 8 drives the sensing post 14 to move linearly to a specific position, that is, when the sensing post 14 reaches within the sensing range of the origin sensor 10, the origin sensor 10 will keenly capture this change in state. At this time, the origin sensor 10 will generate a specific signal according to its internal working principle. This signal will then be accurately transmitted to the host computer. After receiving the signal from the origin sensor 10, the host computer processes it through the pre-set programs and algorithms inside, and then sends an instruction to the motor 2 to stop moving. After receiving the instruction from the host computer, the motor 2 will stop running, thus determining the origin position of the entire equipment operation;

[0029] Extended position: The setting of the extended position is to effectively limit the linear movement of the back plate 8 in a specific direction. The extended limit block 9 moves on the back plate 8. As the back plate 8 moves linearly under the drive of power, when this linear movement of the back plate 8 continues and makes the extended limit block 9 gradually approach and finally reach the sensing position of the extended limit sensor 11, the extended limit sensor 11 will play its detection function. The extended limit sensor 11 will detect the arrival of the extended limit block 9, and then generate a signal according to its own functional characteristics. This signal will be quickly and accurately sent to the host computer. According to the received signal, the host computer sends an instruction to the motor 2 to stop moving according to the pre-set logic and program. After receiving the instruction, the motor 2 stops working, thus determining the extended position of the back plate 8; This extended position has a high degree of flexibility. By adjusting the position of the extended limit sensor 11 or related parameter settings, the extended position of the back plate 8 can be changed according to actual needs to adapt to different working scenarios, process requirements or different operating states of the equipment and other situations.

[0030] In a specific embodiment, a chute 12 for the ball screw nut 5 to slide is provided on the slide rail 6, and a sliding groove 13 for the ball screw nut 5 to slide is provided on the upper end cover 1 of the main body;

[0031] When in use, the ball screw nut 5 can move horizontally in the chute 12 and the sliding groove 13 to ensure the smoothness of the back plate 8 during the process of pulling, pushing or lifting the material.

[0032] In a specific embodiment, the back plate 8 is arranged in an L shape; an extension rod 15 is provided on the back plate 8, and the extension rod 15 is slidably connected to the ball screw 4 and is also slidably matched with the ball screw 4. When the back plate 8 rotates with the ball screw 4 and moves horizontally forward, the position of the extension rod 15 can ensure the limit and support of the end of the back plate 8 during movement, and also provide a support point for the rotation of the ball screw 4.

[0033] The above are only the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. An electric linear actuator, characterized in that, It includes an upper end cover (1) of the main body. A motor (2) is provided at the rear end of the upper end cover (1) of the main body, and a bottom cover (3) of the main body is installed on the motor (2). A ball screw (4) is provided on the main shaft of the motor (2), and a ball screw nut (5) threadedly connected to the ball screw (4) is provided on the ball screw (4). A horizontally arranged slide rail (6) is provided between the motor (2) and the upper end cover (1) of the main body, and a slider (7) slidably engaged with the slide rail (6) is provided on the slide rail (6). A back plate (8) is horizontally connected to the slider (7), and the ball screw nut (5) is connected to the slider (7).

2. An electric linear actuator according to claim 1, wherein: An extended limit block (9) is provided on the back plate (8) and is located on the side close to the bottom cover (3) of the main body.

3. An electric linear actuator according to claim 1, characterized in that: An origin sensor (10) is provided on the upper end cover (1) of the main body.

4. An electric linear actuator according to claim 1, characterized in that: An extended limit sensor (11) is provided on the upper end cover (1) of the main body.

5. An electric linear actuator according to claim 1, characterized in that: A chute (12) for the ball screw nut (5) to slide is provided on the slide rail (6), and a sliding groove (13) for the ball screw nut (5) to slide is provided on the upper end cover (1) of the main body.

6. An electric linear actuator according to claim 1, characterized in that: The back plate (8) is arranged in an L shape.

7. An electric linear actuator according to claim 1, characterized in that: An induction column (14) is provided on the side of the back plate (8) close to the upper end cover (1) of the main body.

8. An electric linear actuator according to claim 1, characterized in that: An extension rod (15) is provided on the back plate (8). The extension rod (15) is slidably connected inside the ball screw (4) and is also slidably engaged with the ball screw (4).

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