High-precision servo electric cylinder

Abstract

The utility model discloses a high-precision servo electric cylinder which comprises an electric cylinder body, a piston rod is arranged at the front end of the electric cylinder body, a guide enhancing assembly is connected to the front end of the piston rod, a transmission assembly is fixedly installed on the outer surface of the rear end of the electric cylinder body, and the guide enhancing assembly comprises a fixing plate, a guide rod, a fixing block and a guide ring. The transmission assembly comprises a worm gear, a rotating shaft, a transmission box, a servo motor, a driving shaft and a worm. According to the high-precision servo electric cylinder, the worm in the transmission assembly is a single-head worm, and the lead angle of the worm is smaller than the equivalent friction angle, so that a worm gear cannot reversely drive the worm, mechanical self-locking is achieved, stability is improved, radial loads can be shared through the arranged guide enhancing assembly and an external guide rail, the lateral force of a ball screw is reduced, and the service life of the ball screw is prolonged. And the bending moment resistance and the vibration resistance are obviously improved (particularly suitable for long-stroke or high-unbalance-load scenes), so that the precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of servo electric cylinder technology, specifically a high-precision servo electric cylinder. Background Technology

[0002] Servo electric cylinders, as a type of precision transmission device that converts the rotary motion of a servo motor into linear motion, are widely used in industrial automation, aerospace, medical devices and other fields.

[0003] However, existing servo electric cylinders have the following significant drawbacks:

[0004] 1. Lack of self-locking capability: Traditional servo electric cylinders mostly rely on motor braking or external brakes to maintain position, but they are prone to position drift under power failure or high load conditions, resulting in insufficient stability and difficulty in meeting the needs of high-precision scenarios.

[0005] 2. Poor resistance to eccentric load: The piston rod of the existing electric cylinder is easily affected by radial force under long stroke or high eccentric load conditions, which causes the ball screw to bear lateral force, leading to bending deformation, increased vibration and other problems, which seriously reduces motion accuracy and service life.

[0006] 3. Insufficient dynamic performance: Especially in environments with frequent vibration or impact loads, traditional guide structures are unable to effectively share the load, resulting in insufficient system rigidity and affecting repeatability and response speed.

[0007] To address this, we propose a high-precision servo electric cylinder. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] To address the shortcomings of existing technologies, this invention provides a high-precision servo electric cylinder with self-locking capability. Furthermore, the external guide rail can share the radial load, reducing the lateral force on the ball screw and significantly improving its resistance to bending moment and vibration. These advantages effectively solve the problems in the prior art.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a high-precision servo electric cylinder, comprising an electric cylinder body, a piston rod disposed at the front end of the electric cylinder body, a guide reinforcement assembly connected to the front end of the piston rod, and a transmission assembly fixedly installed on the outer surface of the rear end of the electric cylinder body. The guide reinforcement assembly includes a fixing plate, a guide rod, a fixing block, and a guide ring. The transmission assembly includes a worm gear, a rotating shaft, a transmission box, a servo motor, a drive shaft, and a worm. The lower part of the outer surface of the front end of the transmission box is fixedly connected to the outer surface of the rear end of the electric cylinder body. The front end of the piston rod penetrates the middle of the fixing plate, and the fixing plate is fixedly installed on the outer wall of the front end of the piston rod.

[0012] Preferably, there are two sets of guide rods, fixing blocks, and guide rings. The two sets of fixing blocks are fixedly installed on the front end of the outer surface of both sides of the electric cylinder body, the two sets of guide rods are fixedly installed on the left and right ends of the outer surface of the rear end of the fixing plate, and the guide ring is fixedly installed in the middle of the outer surface of one side of the fixing block.

[0013] Preferably, the guide rod passes through the guide ring, and the outer wall of the guide rod is slidably connected to the guide ring.

[0014] Preferably, the servo motor is fixedly installed on the upper part of the outer surface of one side of the transmission box, the drive shaft is connected to the outer surface of one end of the servo motor, a coupling is provided between the drive shaft and the servo motor, the outer surface of one end of the drive shaft is fixedly connected to the outer surface of one end of the output shaft of the servo motor through the coupling, the worm is fixedly installed on the drive shaft, and the worm wheel is located on the lower outer surface of the worm.

[0015] Preferably, the worm gear and worm are both located inside the transmission box. The worm gear is fixedly installed on the outer wall of one end of the rotating shaft. Bearings are provided between the drive shaft, the worm gear and the transmission box. The drive shaft and the worm gear are rotatably connected to the transmission box through the bearings. The outer surface of the front end of the rotating shaft is fixedly connected to the outer surface of the rear end of the ball screw in the electric cylinder.

[0016] Preferably, the worm in the transmission assembly is a single-start worm, and the worm lead angle is less than the equivalent friction angle, so that the worm wheel cannot drive the worm in the reverse direction, thus achieving mechanical self-locking.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this utility model provides a high-precision servo electric cylinder, which has the following beneficial effects:

[0019] 1. This high-precision servo electric cylinder has a single-start worm gear in its transmission assembly, and the worm gear lead angle is smaller than the equivalent friction angle, which prevents the worm wheel from driving the worm gear in reverse, thus achieving mechanical self-locking, improving stability, and maintaining positional stability even under power failure or high load conditions. This avoids the drift problem caused by the reliance on motor braking in traditional electric cylinders, and significantly improves system safety and accuracy.

[0020] 2. This high-precision servo electric cylinder distributes the radial load through the guide reinforcement components (fixed plate, guide rod, fixed block and guide ring), reduces the lateral force of the ball screw, effectively reduces the risk of bending deformation, and is particularly suitable for long stroke or high off-center load scenarios. It significantly improves the electric cylinder's resistance to bending moment and vibration, and ensures smooth movement and structural reliability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a high-precision servo electric cylinder according to the present invention.

[0022] Figure 2 This is a partial structural schematic diagram of a high-precision servo electric cylinder according to the present invention.

[0023] Figure 3 This is a schematic diagram of the transmission component in a high-precision servo electric cylinder according to this utility model.

[0024] Figure 4 This is a side cross-sectional view of the transmission box in a high-precision servo electric cylinder according to this utility model.

[0025] In the diagram: 1. Electric cylinder body; 2. Piston rod; 3. Guide reinforcement assembly; 4. Transmission assembly; 5. Fixing plate; 6. Guide rod; 7. Fixing block; 8. Guide ring; 9. Worm gear; 10. Rotating shaft; 11. Transmission box; 12. Servo motor; 13. Drive shaft; 14. Worm gear. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] This embodiment is a high-precision servo electric cylinder.

[0028] like Figure 1-4As shown, the device includes an electric cylinder body 1, a piston rod 2 at the front end of the electric cylinder body 1, a guide reinforcement component 3 connected to the front end of the piston rod 2, and a transmission component 4 fixedly installed on the outer surface of the rear end of the electric cylinder body 1. The guide reinforcement component 3 includes a fixing plate 5, a guide rod 6, a fixing block 7, and a guide ring 8. The transmission component 4 includes a worm gear 9, a rotating shaft 10, a transmission box 11, a servo motor 12, a drive shaft 13, and a worm gear 14. The lower part of the outer surface of the front end of the transmission box 11 is fixedly connected to the outer surface of the rear end of the electric cylinder body 1. The front end of the piston rod 2 passes through the middle of the fixing plate 5, and the fixing plate 5 is fixedly installed on the outer wall of the front end of the piston rod 2.

[0029] There are two sets of guide rods 6, fixing blocks 7, and guide rings 8. Two sets of fixing blocks 7 are fixedly installed on the front ends of the outer surfaces on both sides of the electric cylinder body 1. Two sets of guide rods 6 are fixedly installed on the left and right ends of the outer surface of the rear end of the fixing plate 5. The guide ring 8 is fixedly installed in the middle of the outer surface of one side of the fixing block 7. The guide rod 6 passes through the guide ring 8, and the outer wall of the guide rod 6 is slidably connected to the guide ring 8. The servo motor 12 is fixedly installed on the upper part of the outer surface of one side of the transmission box 11. The drive shaft 13 is connected to the outer surface of one end of the servo motor 12. A coupling is provided between the drive shaft 13 and the servo motor 12. The outer surface of one end of the drive shaft 13 is connected to the output shaft of the servo motor 12 through the coupling. One end of the outer surface is fixedly connected, and the worm 14 is fixedly installed on the drive shaft 13, with the worm wheel 9 located on the lower outer surface of the worm 14; both the worm wheel 9 and the worm 14 are located inside the transmission box 11, and the worm wheel 9 is fixedly installed on the outer wall of one end of the rotating shaft 10. Bearings are provided between the drive shaft 13, the worm wheel 9 and the transmission box 11, and the drive shaft 13 and the worm wheel 9 are rotatably connected to the transmission box 11 through the bearings. The outer surface of the front end of the rotating shaft 10 is fixedly connected to the outer surface of the rear end of the ball screw in the electric cylinder body 1; the worm 14 in the transmission assembly 4 is a single-start worm, and the lead angle of the worm 14 is less than the equivalent friction angle, so that the worm wheel 9 cannot drive the worm 14 in reverse, thus achieving mechanical self-locking.

[0030] It should be noted that this utility model is a high-precision servo electric cylinder. The electric cylinder body 1 and piston rod 2 are both existing technologies. A ball screw is installed inside the electric cylinder body 1, which is readily known to those skilled in the art and will not be described in detail here. The guide reinforcement component 3 drives the fixed plate 5 to move when the piston rod 2 moves. The fixed plate 5 drives the guide rod 6 to move along the guide ring 8, which improves the stability of the piston rod 2, distributes the radial load, reduces the lateral force of the ball screw, and significantly improves the bending moment resistance and vibration resistance, making it particularly suitable for long stroke or high off-center load scenarios, thereby improving accuracy. The transmission component 4 has a single-start worm gear 14 with a lead angle smaller than the equivalent friction angle, which prevents the worm wheel 9 from driving the worm gear 14 in the reverse direction, achieving mechanical self-locking and improving stability. The operation of the servo motor 12 drives the drive shaft 13 and the worm gear 14 to rotate. The worm gear 14 drives the rotating shaft 10 to rotate through the worm wheel 9, and the rotating shaft 10 drives the ball screw inside the electric cylinder body 1 to rotate.

[0031] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A high-precision servo electric cylinder comprising an electric cylinder body (1), a piston rod (2) being arranged at the front end of the electric cylinder body (1), characterized in that: The piston rod (2) is connected to a guide reinforcement component (3) at its front end. A transmission component (4) is fixedly installed on the outer surface of the rear end of the electric cylinder (1). The guide reinforcement component (3) includes a fixing plate (5), a guide rod (6), a fixing block (7), and a guide ring (8). The transmission component (4) includes a worm gear (9), a rotating shaft (10), a transmission box (11), a servo motor (12), a drive shaft (13), and a worm (14). The lower part of the outer surface of the front end of the transmission box (11) is fixedly connected to the outer surface of the rear end of the electric cylinder (1). The front end of the piston rod (2) passes through the middle of the fixing plate (5), and the fixing plate (5) is fixedly installed on the outer wall of the front end of the piston rod (2).

2. A high precision servo motor driven cylinder according to claim 1, characterized in that: The number of guide rods (6), fixing blocks (7) and guide rings (8) are all two sets. The two sets of fixing blocks (7) are fixedly installed on the front end of the outer surface of both sides of the electric cylinder body (1). The two sets of guide rods (6) are fixedly installed on the left and right ends of the outer surface of the rear end of the fixing plate (5). The guide rings (8) are fixedly installed in the middle of the outer surface of one side of the fixing block (7).

3. A high precision servo motor driven cylinder according to claim 2, characterized in that: The guide rod (6) passes through the guide ring (8), and the outer wall of the guide rod (6) and the guide ring (8) are slidably connected.

4. A high precision servo motor driven cylinder according to claim 3, characterized in that: The servo motor (12) is fixedly installed on the upper part of the outer surface of one side of the transmission box (11). The drive shaft (13) is connected to the outer surface of one end of the servo motor (12). A coupling is provided between the drive shaft (13) and the servo motor (12). The outer surface of one end of the drive shaft (13) is fixedly connected to the outer surface of one end of the output shaft in the servo motor (12) through the coupling. The worm (14) is fixedly installed on the drive shaft (13), and the worm wheel (9) is located on the lower outer surface of the worm (14).

5. A high precision servo motor driven cylinder according to claim 4, characterized in that: The worm wheel (9) and worm (14) are both located inside the transmission box (11). The worm wheel (9) is fixedly installed on the outer wall of one end of the rotating shaft (10). Bearings are provided between the drive shaft (13), the worm wheel (9) and the transmission box (11). The drive shaft (13) and the worm wheel (9) are rotatably connected to the transmission box (11) through the bearings. The outer surface of the front end of the rotating shaft (10) is fixedly connected to the outer surface of the rear end of the ball screw in the electric cylinder (1).

6. A high-precision servo electric cylinder according to claim 5, characterized in that: The worm (14) in the transmission assembly (4) is a single-headed worm, and the lead angle of the worm (14) is less than the equivalent friction angle, so that the worm wheel (9) cannot drive the worm (14) in the reverse direction, thus achieving mechanical self-locking.

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