Improved compact electric cylinder

Abstract

The utility model discloses an improved compact type electric cylinder which comprises a servo motor, a planetary reducer is installed at the lower end of the servo motor, a gear box is installed at the lower end of the planetary reducer, a bearing seat is arranged at the upper end of the gear box and located on one side of the planetary reducer, and the bearing seat is connected with the planetary reducer. A cylinder barrel is installed at the upper end of the bearing seat, a front flange is arranged at the upper end of the cylinder barrel, a limiting switch is embedded in the outer surface of an anti-rotation block pressing plate, a ball screw is installed in the cylinder barrel, the ball screw is sleeved with a lead screw nut, and an anti-rotation block is installed on the outer side of the lead screw nut. A guide shaft piston rod is connected to the anti-rotation block in an inserted mode, and an outer screw joint is installed at the upper end of the guide shaft piston rod. Through reasonable layout of the servo motor, the planetary reducer, the gear box and other parts, the overall occupied space is reduced, and compared with a traditional large-tonnage electric cylinder, the structure is more compact, and the electric cylinder is suitable for the working environment with limited space.

Description

Technical Field

[0001] This utility model relates to the field of electric cylinder technology, specifically an improved compact electric cylinder. Background Technology

[0002] In the field of industrial automation, large-tonnage electric cylinders are commonly used in heavy machinery, automobile manufacturing, aerospace, and other applications requiring high-load drive. Traditional large-tonnage electric cylinders often suffer from problems such as bulky structure, large footprint, and low transmission efficiency, making it difficult to meet the demands of modern industry for compact and efficient equipment. Therefore, those skilled in the art have provided an improved, compact electric cylinder to address the problems mentioned in the background section. Summary of the Invention

[0003] The purpose of this utility model is to provide an improved compact electric cylinder. Through innovative structural design and optimization of the layout and function of each component, the size of the electric cylinder is significantly reduced while ensuring a large tonnage load capacity, thereby improving space utilization. At the same time, it improves transmission efficiency, reduces energy loss, and enhances operational stability and reliability, so as to meet the modern industrial demand for high-performance and compact electric cylinders.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An improved compact electric cylinder includes a servo motor, a planetary reducer mounted at the lower end of the servo motor, a gearbox mounted at the lower end of the planetary reducer, a bearing housing located at the upper end of the gearbox and on one side of the planetary reducer, a cylinder barrel mounted at the upper end of the bearing housing, a front flange located at the upper end of the cylinder barrel, and an anti-rotation block pressure plate located on the outer edge of the cylinder barrel. A limit switch is embedded in the outer surface of the anti-rotation block pressure plate. A ball screw is installed inside the cylinder barrel, a screw nut is sleeved on the outside of the ball screw, an anti-rotation block is mounted on the outside of the screw nut, a guide shaft piston rod is inserted into the anti-rotation block, and an external threaded joint is mounted on the upper end of the guide shaft piston rod.

[0006] As a further improvement of this utility model: a dustproof ring is provided at the connection between the inner side of the front flange and the upper part of the guide shaft piston rod, and a hydraulic dynamic sealing ring is installed at the lower end of the dustproof ring on the inner side of the front flange, and a guide bushing is installed at the connection between the front flange and the lower part of the guide shaft piston rod.

[0007] As a further embodiment of this utility model: the lower end of the planetary reducer is connected to the driving gear inside the gearbox, one end of the driving gear is meshed with the transmission gear, one end of the transmission gear is meshed with the driven gear, and a ball screw is sleeved in the middle of the driven gear.

[0008] As a further improvement of this utility model: a gear sealing plate is installed at the bottom of the gearbox, and the ball screw is connected to the gear sealing plate through a support bearing.

[0009] As a further embodiment of this utility model: a bearing spacer is provided on the lower end of the ball screw, and a thrust bearing is installed on the outside of the bearing spacer, and the thrust bearing is fixed on the bearing seat.

[0010] As a further improvement of this utility model: two slots are provided on the outer side of the anti-rotation block, and bronze guide rods are installed in the slots. The bronze guide rods are vertically installed on the rear side of the anti-rotation block pressure plate.

[0011] As a further improvement of this utility model: the two slots of the anti-rotation block are filled with graphite, and the anti-rotation block is a component made of copper.

[0012] As a further improvement of this utility model, a deep groove ball bearing is installed at the contact point between the transmission gear and the gearbox.

[0013] As a further improvement of this utility model: a radial locking nut is provided at the connection between the gearbox and the bearing housing, and a tension bearing is provided at the contact point between the bearing housing and the ball screw.

[0014] As a further embodiment of this utility model: the lower end of the bearing housing is fixedly installed to the gearbox by bolts, and the external threaded joint is fixedly installed to the guide shaft piston rod by bolts.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By rationally arranging components such as servo motors, planetary reducers, and gearboxes, the overall space occupied is reduced. Compared with traditional large-tonnage electric cylinders, the structure is more compact and suitable for working environments with limited space.

[0017] 2. It adopts a combination of gear transmission and ball screw transmission, along with a high-strength structural design, which can withstand heavy loads and meet the needs of heavy machinery and other fields. The ball screw transmission has high transmission efficiency and reduces energy loss, while the stability of the gear transmission ensures effective power transmission and improves the working efficiency of the electric cylinder.

[0018] 3. The inclusion of anti-rotation blocks, guide bushings, and other components ensures the straightness and stability of the guide shaft piston rod movement; dustproof rings, hydraulic dynamic seals, and other sealing components effectively protect internal parts and extend the service life of the electric cylinder; and the inclusion of limit switches improves the safety of the electric cylinder operation. Attached Figure Description

[0019] Figure 1A schematic diagram of an improved compact electric cylinder;

[0020] Figure 2 A schematic diagram of the mounting structure of a ball screw in an improved compact electric cylinder;

[0021] Figure 3 This is a schematic diagram of the mounting structure of the guide shaft piston rod in an improved compact electric cylinder.

[0022] In the diagram: 1. Servo motor; 2. Planetary reducer; 3. Gearbox; 4. Cylinder; 5. Anti-rotation block pressure plate; 6. Limit switch; 7. Front flange; 8. External threaded connector; 9. Dust seal; 10. Hydraulic dynamic seal ring; 11. Anti-rotation block; 12. Thrust bearing; 13. Tension bearing; 14. Radial lock nut; 15. Guide bushing; 16. Ball screw; 17. Guide shaft piston rod; 18. Screw nut; 19. Bearing spacer; 20. Bearing housing; 21. Driven gear; 22. Gear sealing plate; 23. Deep groove ball bearing; 24. Transmission gear; 25. Drive gear. 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 Figures 1-3 In this embodiment of the present invention, an improved compact electric cylinder uses a servo motor 1 as the power source for the electric cylinder, which can precisely control the output speed and torque, providing a stable power input for the entire system.

[0025] Planetary reducer 2 is installed at the lower end of servo motor 1 to reduce the speed and increase the torque of the power output by servo motor 1, converting high-speed, low-torque power into low-speed, high-torque power to meet the subsequent transmission and load requirements.

[0026] Gearbox 3 receives the power transmitted from planetary reducer 2 and internally houses a driving gear 25, a transmission gear 24, and a driven gear 21. The driving gear 25 is connected to the lower end of planetary reducer 2 and transmits power to ball screw 16 through meshing with transmission gear 24 and driven gear 21, achieving further power transmission and conversion. The gear cover plate 22 installed at the bottom of gearbox 3 protects the internal gear transmission structure and prevents dust and impurities from entering. It also provides a support connection point for the lower end of ball screw 16. Ball screw 16 is connected to gear cover plate 22 through a support bearing to ensure its rotational stability.

[0027] The ball screw 16 and the screw nut 18 are installed inside the cylinder 4. The middle part of the ball screw 16 is connected to the driven gear 21 and realizes rotational motion under the action of gear transmission. The screw nut 18 is connected to the outside of the ball screw 16 and converts the rotational motion of the ball screw 16 into linear motion. It is a key transmission component for realizing the extension and retraction of the electric cylinder.

[0028] The bearing housing 20 is located on one side of the upper end of the gearbox 3. It is used to install and fix components such as the thrust bearing 12, and to provide support for the lower end of the ball screw 16, ensuring its axial stability. The bearing housing 20 is fixedly installed to the gearbox 3 with bolts, ensuring a stable connection.

[0029] The cylinder 4 is mounted on the upper end of the bearing housing 20, providing installation space and protection for internal components such as the ball screw 16 and screw nut 18, while also guiding the movement of the guide shaft piston rod 17.

[0030] An anti-rotation block pressure plate 5, located on the outside of the cylinder 4, provides an installation position for the bronze guide rod. A limit switch 6 is embedded in the outer surface of the anti-rotation block pressure plate 5, which can monitor the movement position of the guide shaft piston rod 17 in real time. When the guide shaft piston rod 17 reaches the set position, the limit switch 6 is triggered, controlling the servo motor 1 to stop running, preventing excessive extension and retraction of the electric cylinder and ensuring operational safety. Two slots are opened on the outer side of the anti-rotation block 11, filled with graphite and made of metallic copper. The bronze guide rod is installed in the slots, vertically mounted on the rear side of the anti-rotation block pressure plate 5. The anti-rotation block 11 is installed on the outside of the lead screw nut 18, cooperating with the bronze guide rod to restrict the rotational movement of the lead screw nut 18, ensuring that it can only move linearly along the ball screw 16. Simultaneously, the graphite reduces friction and improves smoothness of movement. The anti-rotation block 11, through the slots and cooperation with the bronze guide rod, converts the rotational movement of the lead screw nut 18 into linear motion.

[0031] The guide shaft piston rod 17 is inserted into the anti-rotation block 11 and reciprocates linearly along the axial direction under the drive of the lead screw nut 18, realizing the extension and retraction function of the electric cylinder. The external threaded connector 8 installed at its upper end is used to connect to the external load and realize the transmission of force.

[0032] The front flange 7 is installed on the upper end of the cylinder 4, and a dustproof ring 9, a hydraulic dynamic seal ring 10, and a guide bushing 15 are provided at the connection between the inner side and the guide shaft piston rod 17. The dustproof ring 9 and the hydraulic dynamic seal ring 10 can effectively prevent dust, liquid and other impurities from entering the electric cylinder and protect the internal components; the guide bushing 15 guides and supports the movement of the guide shaft piston rod 17, improving the stability and accuracy of the movement.

[0033] The bearing spacer 19 is fitted onto the outside of the lower end of the ball screw 16 to isolate and position components such as the thrust bearing 12, ensuring accurate installation of each component. The thrust bearing 12 is installed outside the bearing spacer 19 and fixed on the bearing housing 20, mainly bearing the axial force of the ball screw 16 and ensuring the stability of its axial movement. The deep groove ball bearing 23 is installed at the contact point between the transmission gear 24 and the gearbox 3, reducing friction when the transmission gear 24 rotates and improving transmission efficiency and stability. The radial lock nut 14 is used to fix the connection between the gearbox 3 and the bearing housing 20, ensuring a tight connection and preventing loosening. The tension bearing 13 is located at the contact point between the bearing housing 20 and the ball screw 16, bearing the tension generated by the ball screw 16 during operation and ensuring its stable operation.

[0034] The working principle of this utility model is as follows: After the servo motor 1 starts, it transmits power to the planetary reducer 2. The planetary reducer 2 reduces the power and increases the torque, and then transmits it to the driving gear 25 in the gearbox 3. The driving gear 25 drives the ball screw 16 to rotate through meshing with the transmission gear 24 and the driven gear 21. When the ball screw 16 rotates, the screw nut 18 that cooperates with it is limited by the anti-rotation block 11, converting the rotational motion into linear motion, which in turn drives the guide shaft piston rod 17 to perform linear reciprocating motion along the axial direction, realizing the extension and retraction action of the electric cylinder. The external threaded joint 8 is used to connect the external load to realize the transmission of force. The limit switch 6 is used to monitor the movement position of the guide shaft piston rod 17. When it reaches the set position, the limit switch 6 is triggered to control the servo motor 1 to stop running and prevent the electric cylinder from excessive extension and retraction. The dustproof ring 9 and the hydraulic dynamic sealing ring 10 can effectively prevent dust, liquid and other impurities from entering the electric cylinder and protect the internal components; the guide bushing 15 plays a guiding and supporting role in the movement of the guide shaft piston rod 17, improving the stability and accuracy of the movement.

[0035] Installation method: First, install the gear sealing plate 22 at the bottom of the gearbox 3. Connect and fix the lower end of the ball screw 16 to the gear sealing plate 22 through the support bearing. Install the driving gear 25, transmission gear 24, and driven gear 21 in sequence inside the gearbox 3, ensuring accurate meshing and appropriate clearance between the gears. Then, connect the lower end of the planetary reducer 2 to the driving gear 25. Install the servo motor 1 on the upper end of the planetary reducer 2. Place the bearing spacer 19 on the outside of the lower end of the ball screw 16. Install the thrust bearing 12 on the bearing housing 20, allowing the ball screw 16 to pass through the thrust bearing 12. Then, fix the bearing housing 20 to one side of the upper end of the gearbox 3 with bolts. Install the anti-rotation block 11 on the outside of the screw nut 18. Install the bronze guide rod in the slot of the anti-rotation block 11. Install the anti-rotation block pressure plate 5 on the cylinder. On the outside of cylinder 4, the bronze guide rod is vertically installed on the rear side of the anti-rotation block pressure plate 5. The guide shaft piston rod 17 is inserted into the anti-rotation block 11. An external threaded connector 8 is installed on the upper end of the guide shaft piston rod 17. Cylinder 4 is installed on the upper end of bearing seat 20, ensuring a firm installation. Dustproof ring 9, hydraulic dynamic sealing ring 10, and guide bushing 15 are installed sequentially on the inner side of front flange 7. Then, front flange 7 is installed on the upper end of cylinder 4. Limit switch 6 is embedded and installed on the outer surface of anti-rotation block pressure plate 5 to complete the overall assembly of electric cylinder. After assembly, the electric cylinder is fully debugged to check whether the connection of each component is firm and whether the operation is smooth. The stroke range of guide shaft piston rod 17 is set by adjusting the position of limit switch 6. The electric cylinder is subjected to load test to ensure that it can stably and reliably achieve the driving task of large tonnage load.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An improved compact electric cylinder comprising a servo motor (1), characterized in that, The lower end of the servo motor (1) is equipped with a planetary reducer (2), the lower end of the planetary reducer (2) is equipped with a gearbox (3), the upper end of the gearbox (3) and located on one side of the planetary reducer (2) is provided with a bearing seat (20), the upper end of the bearing seat (20) is equipped with a cylinder (4), the upper end of the cylinder (4) is provided with a front flange (7), and the outer side is provided with an anti-rotation block pressure plate (5). The outer surface of the anti-rotation block pressure plate (5) is embedded with a limit switch (6). The inside of the cylinder (4) is equipped with a ball screw (16), the outside of the ball screw (16) is sleeved with a screw nut (18), the outside of the screw nut (18) is equipped with an anti-rotation block (11), the anti-rotation block (11) is inserted with a guide shaft piston rod (17), and the upper end of the guide shaft piston rod (17) is equipped with an external threaded joint (8).

2. An improved compact electric cylinder according to claim 1, characterized in that, A dustproof ring (9) is provided at the connection between the inner side of the front flange (7) and the upper part of the guide shaft piston rod (17); a hydraulic dynamic sealing ring (10) is provided at the lower end of the dustproof ring (9); and a guide bushing (15) is provided at the lower connection.

3. The improved compact electric cylinder according to claim 1, wherein The lower end of the planetary reducer (2) is connected to the drive gear (25) inside the gearbox (3). One end of the drive gear (25) is meshed with the transmission gear (24). One end of the transmission gear (24) is meshed with the driven gear (21). A ball screw (16) is sleeved in the middle of the driven gear (21).

4. The improved compact electric cylinder according to claim 1, characterized by, The bottom of the gearbox (3) is equipped with a gear sealing plate (22), and the ball screw (16) is connected to the gear sealing plate (22) through a support bearing.

5. The improved compact electric cylinder according to claim 1, wherein, The lower end of the ball screw (16) is provided with a bearing spacer (19), and a thrust bearing (12) is installed on the outside of the bearing spacer (19). The thrust bearing (12) is fixed on the bearing seat (20).

6. The improved compact electric cylinder according to claim 1, characterized by, Two slots are provided on the outer side of the anti-rotation block (11), and bronze guide rods are installed in the slots. The bronze guide rods are vertically installed on the rear side of the anti-rotation block pressure plate (5).

7. The improved compact electric cylinder according to claim 6, characterized in that, The anti-rotation block (11) has graphite inside its two slots, and the anti-rotation block (11) is a component made of copper.

8. The improved compact electric cylinder according to claim 3, wherein A deep groove ball bearing (23) is provided at the contact point between the transmission gear (24) and the gearbox (3).

9. The improved compact electric cylinder according to claim 1, characterized by, A radial locking nut (14) is provided at the connection between the gearbox (3) and the bearing seat (20), and a tension bearing (13) is provided at the contact point between the bearing seat (20) and the ball screw (16).

10. The improved compact electric cylinder according to claim 1, characterized by, The lower end of the bearing housing (20) is fixedly installed to the gearbox (3) by bolts, and the external threaded joint (8) is connected to the guide shaft piston rod (17) by detachable bolts.

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