A split housing large stroke electric cylinder

Abstract

The application relates to the technical field of electric cylinders, in particular to a shell split type large-stroke electric push cylinder, which comprises a mounting seat, a motor detachably arranged on the mounting seat, a screw rod rotationally arranged on the mounting seat, a torque piece arranged between the screw rod and the motor and used for transmitting torque, an outer pipe arranged on the mounting seat, the outer pipe being coaxially sleeved on the screw rod, a sliding block with a polygonal cross section being threadedly connected to the screw rod, a sliding groove for the sliding block to slide being arranged on the inner side wall of the outer pipe and along the axial direction of the outer pipe, an inner pipe arranged on the sliding block, an outer end ring arranged between the end of the outer pipe away from the mounting seat and the inner pipe, an inner end ring coaxially arranged on the end of the screw rod away from the mounting seat, an inner support piece and an outer support piece arranged on the sliding block, the inner support piece being used for supporting the screw rod between the inner end ring and the sliding block when the sliding block slides, and the outer support piece being used for supporting the screw rod between the mounting seat and the sliding block. The application has the effect of reducing the self weight of the large-stroke electric push cylinder.

Description

Technical Field

[0001] This application relates to the field of electric cylinder technology, and in particular to a large-stroke electric cylinder with a split housing. Background Technology

[0002] An electric actuator, also called an electric push rod or electric cylinder, is an electrically driven device that converts the rotary motion of an electric motor into the linear reciprocating motion of a push rod. It is widely used in automation equipment, machinery manufacturing, industrial vehicles, medical devices, and other fields to achieve precise displacement, positioning, and force control. An electric actuator typically consists of a drive motor, reduction gears, a screw, a nut, a guide rail, a push rod, and micro-control switches, and is characterized by its compact structure, sensitive operation, smooth running, and high reliability.

[0003] Currently, in the design of electric actuators, the problem of bending deformation in the middle of the screw due to excessive length can seriously affect the accuracy and stability of the movement. Therefore, the length-to-diameter ratio of the screw usually needs to be ≤70. However, for some special industries, it is often necessary to customize ultra-long screws (such as screw length >3 meters). Therefore, in the design process, it is necessary to overcome the problem of bending deformation caused by excessive screw length.

[0004] For extra-long screws, the diameter is usually increased. However, an excessively large diameter will result in an excessively large electric push cylinder and an excessively heavy electric push cylinder, which has obvious drawbacks. Summary of the Invention

[0005] To address the issue of excessive weight in the electric actuator cylinder caused by an ultra-long screw, this application provides a large-stroke electric actuator cylinder with a split outer shell.

[0006] The technical solution for a split-shell type long-stroke electric actuator provided in this application is as follows: A split-shell type long-stroke electric actuator includes a mounting base, on which a motor is detachably mounted. A screw is rotatably mounted on the mounting base, and a torque-transmitting component is provided between the screw and the motor. An outer tube is mounted on the mounting base and coaxially sleeved on the screw. A polygonal-shaped slider is threadedly connected to the screw. A groove for sliding the slider is formed on the inner sidewall of the outer tube along its axial direction. An inner tube is mounted on the slider and coaxially sleeved on the inner tube. An outer end ring is provided between the outer tube and the inner tube at the end away from the mounting base on the screw, and an inner end ring is coaxially provided at the end of the screw away from the mounting base. The inner circumferential sidewall of the inner tube is attached to the outer circumferential sidewall of the inner end ring. An inner support member and an outer support member are provided on the slider. When the slider slides, the inner support member is used to support the screw between the inner end ring and the slider, and the outer support member is used to support the screw between the mounting base and the slider.

[0007] By adopting the above technical solution, the torque component transmits the torque on the motor output shaft to the screw. As the screw rotates, the slider, under the constraint of the sliding groove, drives the inner tube to slide along the axis of the screw. During this process, the inner end ring provides stable support between the end of the screw away from the mounting seat and the inner tube, while the outer end ring provides dynamic stable support between the end of the outer tube away from the mounting seat and the inner tube. At the same time, the inner support component provides dynamic stable support for the screw between the inner end ring and the slider, and the outer support component provides dynamic stable support for the screw between the mounting seat and the slider. In this way, without increasing the screw diameter, the bending deformation of the long screw is reduced, thereby reducing the overall size of the electric push cylinder and ultimately achieving the effect of reducing the weight of the electric push cylinder.

[0008] Optionally, the torque component includes a torque rod coaxially mounted on the screw, and a torque groove is provided on the output shaft of the motor for the torque rod to be inserted into. The cross-sections of the torque rod and the torque groove are both polygonal. A movable plate base is detachably mounted on the mounting base, and the motor is mounted on the movable plate base.

[0009] By adopting the above technical solution, the output shaft of the motor drives the screw to rotate through the torque rod, and the detachable movable plate seat facilitates the maintenance of the motor.

[0010] Optionally, the inner support member includes multiple inner support rings coaxially sleeved on the screw. The multiple inner support rings are arranged along the axial direction of the screw and are located between the inner end ring and the slider. An inner support spring is provided between two adjacent inner support rings. The circumferential inner sidewall of the inner support ring is attached to the outer sidewall of the screw, and the circumferential outer sidewall of the inner support ring is attached to the circumferential inner sidewall of the inner tube.

[0011] By adopting the above technical solution, as the slider moves away from the mounting base, it will compress multiple inner support rings between the inner end ring and the slider. The inner support springs will deform under pressure. Since the elastic properties of multiple inner support springs tend to be consistent, multiple inner support rings will slide and be evenly distributed between the inner end ring and the slider. This will dynamically and stably support the screw between the inner end ring and the slider, reducing the possibility of bending deformation of the screw between the inner end ring and the slider. At the same time, under the support of multiple inner support rings, the screw between the inner end ring and the slider will form a whole with the inner tube, indirectly increasing the diameter of the screw, thereby improving the structural strength of the screw in the axial direction and further reducing the possibility of bending deformation of the screw between the inner end ring and the slider.

[0012] Optionally, the end of the inner support ring is coaxially provided with an inner ring groove, and the end of the inner support spring is located in the inner ring groove.

[0013] By adopting the above technical solution, the possibility of the inner support spring accidentally detaching from the inner support ring during the sliding process is reduced, and the possibility of the inner support ring directly contacting the screw and causing damage to the screw is reduced.

[0014] Optionally, the outer support member includes multiple outer support rings coaxially sleeved on the screw. The multiple outer support rings are arranged along the axial direction of the screw and are located between the mounting base and the slider. An outer support spring is abutting between two adjacent outer support rings. The circumferential inner sidewall of the outer support ring is attached to the outer sidewall of the screw, and the circumferential outer sidewall of the outer support ring is attached to the circumferential inner sidewall of the outer tube.

[0015] By adopting the above technical solution, as the slider moves away from the mounting base, the restoring deformation force of the outer support spring will push the outer support ring to slide along the axis of the screw. Multiple outer support rings will be evenly distributed between the mounting base and the slider, and these multiple outer support rings will provide dynamic and stable support for the screw between the mounting base and the slider. At the same time, under the action of the outer support rings, the outer tube indirectly increases the structural strength of the screw between the mounting base and the slider, thereby reducing the possibility of bending deformation of the screw between the mounting base and the slider.

[0016] Optionally, the outer support ring has an outer ring groove coaxially formed at its end, and the end of the outer support spring is located in the outer ring groove.

[0017] By adopting the above technical solution, the possibility of the outer support spring accidentally detaching from the outer support ring during the sliding process is reduced, and the possibility of the outer support ring directly contacting the screw and causing damage to the screw is reduced.

[0018] Optionally, a protective tube is bolted to the mounting base, the motor is located inside the protective tube, a cap is bolted to one end of the protective tube facing away from the mounting base, and a pressing groove is provided on the protective tube to press the movable plate seat onto the mounting base.

[0019] By adopting the above technical solution and using bolting, it is easier for workers to maintain the equipment later.

[0020] Optionally, the motor is provided with a recess, the cover is provided with a circular guide post coaxial with the protective tube, the recess is provided with a conductive groove for the circular guide post to be inserted, multiple conductive rings are coaxially arranged on the circular guide post along its axial direction, the cover is provided with a bundled wire connected to the conductive rings, multiple stepped grooves are provided on the outer wall of the recess, the stepped grooves are connected to the conductive grooves, the stepped grooves correspond one-to-one with the conductive rings, a graphite electrode is slidably arranged in the stepped groove, the graphite electrode is electrically connected to the motor, a baffle for sealing the stepped groove is detachably provided on the outer wall of the recess, a tension spring is supported between the graphite electrode and the baffle, a chamfer is provided at one end of the circular guide post near the recess, the chamfer of the circular guide post is used to abut and slide with the graphite electrode, and the tension spring is used to press the graphite electrode tightly onto the conductive ring.

[0021] By adopting the above technical solution, during the process of workers installing the cover, the round guide post will gradually be inserted into the conductive groove on the recess. During this process, the chamfer on the round guide post will abut and push the graphite electrode, and the graphite electrode will compress the tension spring until the cover is installed in place. At this time, the graphite electrode is pressed tightly on the conductive ring under the action of the tension spring, thereby realizing the electrical connection between the bundled wires and the motor.

[0022] Optionally, sealing rings are provided between the outer end ring and the outer tube, between the outer end ring and the inner tube, between the outer tube and the mounting base, between the mounting base and the protective tube, and between the protective tube and the cap.

[0023] By adopting the above technical solution, the overall sealing performance of the electric actuator cylinder is improved, reducing the possibility of damage to the electric actuator cylinder caused by external water or other substances entering the cylinder.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The torque component transmits the torque from the motor output shaft to the screw. As the screw rotates, the slider, under the constraint of the slide groove, drives the inner tube to slide along the axis of the screw. During this process, the inner end ring provides stable support between the end of the screw away from the mounting seat and the inner tube, while the outer end ring provides dynamic stable support between the end of the outer tube away from the mounting seat and the inner tube. At the same time, the inner support component provides dynamic stable support for the screw between the inner end ring and the slider, and the outer support component provides dynamic stable support for the screw between the mounting seat and the slider. In this way, without increasing the screw diameter, the bending deformation of the long screw is reduced, thereby reducing the overall size of the electric push cylinder and ultimately reducing the weight of the electric push cylinder. 2. As the slider moves away from the mounting base, it compresses multiple inner support rings between the inner end ring and the slider. The inner support springs deform under pressure. Since the elastic properties of the multiple inner support springs tend to be consistent, the multiple inner support rings slide and are evenly distributed between the inner end ring and the slider. This provides dynamic and stable support for the screw between the inner end ring and the slider, reducing the possibility of bending deformation of the screw between the inner end ring and the slider. At the same time, under the support of the multiple inner support rings, the screw between the inner end ring and the slider forms a whole with the inner tube, indirectly increasing the diameter of the screw, thereby improving the structural strength of the screw in the axial direction and further reducing the possibility of bending deformation of the screw between the inner end ring and the slider. 3. As the slider moves away from the mounting base, the restoring deformation force of the outer support spring will push the outer support ring to slide along the axis of the screw. Multiple outer support rings will be evenly distributed between the mounting base and the slider. These multiple outer support rings will provide dynamic and stable support for the screw between the mounting base and the slider. At the same time, under the action of the outer support rings, the outer tube indirectly increases the structural strength of the screw between the mounting base and the slider, thereby reducing the possibility of bending deformation of the screw between the mounting base and the slider. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0026] Figure 2 This is a cross-sectional view used in the embodiments of this application to illustrate the positional relationship between the motor, slider, and screw.

[0027] Figure 3 This is an embodiment of the present application. Figure 2 A magnified view of part A in the middle.

[0028] Figure 4 This is an embodiment of the present application. Figure 2 A magnified view of part B in the middle section.

[0029] Figure 5 This is an embodiment of the present application. Figure 2 A magnified view of part C in the middle.

[0030] Figure 6 This is an embodiment of the present application. Figure 2 A magnified view of part D in the middle.

[0031] Explanation of reference numerals in the attached drawings: 1. Mounting base; 2. Motor; 3. Screw; 4. Torque component; 41. Torque rod; 42. Torque groove; 43. Moving plate base; 5. Outer tube; 6. Slider; 7. Slide groove; 8. Inner tube; 9. Outer end ring; 10. Inner end ring; 11. Inner support component; 111. Inner support ring; 112. Inner support spring; 12. Outer support component; 121. Outer support ring; 122. Outer support spring; 13. Inner ring groove; 14. Outer ring groove; 15. Protective tube; 16. Cover; 17. Pressing groove; 18. Recessed seat; 19. Round guide post; 20. Conductive groove; 21. Conductive ring; 22. Bundled wire; 23. Stepped groove; 24. Graphite electrode; 25. Baffle; 26. Tension spring; 27. Chamfer; 28. Sealing ring. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0033] This application discloses a split-shell type long-stroke electric push cylinder.

[0034] Reference Figure 1 and Figure 2 A split-shell type long-stroke electric push cylinder includes a mounting base 1, on which a motor 2 electrically connected to a control system is detachably arranged. The motor 2 can be a forward and reverse motor as in the prior art. A screw 3 is rotatably connected to the mounting base 1, and a torque element 4 for transmitting torque is arranged between the screw 3 and the motor 2.

[0035] Reference Figure 2 and Figure 3 The torque component 4 includes a torque rod 41 that is coaxial and integrally formed on the end of the screw 3. The output shaft of the motor 2 is provided with a torque groove 42 for the torque rod 41 to be inserted. The cross-sections of the torque rod 41 and the torque groove 42 are both regular polygons. A movable plate seat 43 is inserted into the mounting base 1 along the axial direction of the screw 3. The motor 2 is bolted to the movable plate seat 43.

[0036] Reference Figure 2 and Figure 4 An outer tube 5 is bolted to the mounting base 1. A sealing ring 28 is arranged between the outer tube 5 and the mounting base 1. The sealing ring 28 can be made of rubber. The outer tube 5 is coaxially sleeved on the screw 3. A slider 6 with a polygonal cross-section is threaded onto the screw 3. A groove 7 for sliding the slider 6 is opened on the inner side wall of the outer tube 5 along its axial direction. An inner tube 8 is bolted to the slider 6.

[0037] Reference Figure 2 and Figure 5 The inner tube 8 is coaxially sleeved on the screw 3. An outer end ring 9 is arranged between the end of the outer tube 5 away from the mounting seat 1 and the inner tube 8. The outer end ring 9 is bolted to the outer tube 5, and the inner circumferential sidewall of the outer end ring 9 is attached to the outer circumferential sidewall of the inner tube 8.

[0038] Reference Figure 2 and Figure 5 The end of the screw 3 away from the mounting base 1 is coaxially bolted with an inner end ring 10. The inner circumferential sidewall of the inner tube 8 is attached to the outer circumferential sidewall of the inner end ring 10. Sealing rings 28 are arranged between the outer end ring 9 and the outer tube 5, and between the outer end ring 9 and the inner tube 8. The sealing rings 28 can be made of rubber material.

[0039] The output shaft of motor 2 drives screw 3 to rotate through torque rod 41. Under the restriction of slide groove 7, slider 6 drives inner tube 8 to slide along the axis of screw 3. During this process, inner end ring 10 provides stable support between the end of screw 3 away from mounting base 1 and inner tube 8, and outer end ring 9 provides dynamic stable support between the end of outer tube 5 away from mounting base 1 and inner tube 8.

[0040] Reference Figure 2 and Figure 4 The slider 6 is provided with an inner support member 11 and an outer support member 12. When the slider 6 slides, the inner support member 11 is used to support the screw 3 between the inner end ring 10 and the slider 6, and the outer support member 12 is used to support the screw 3 between the mounting base 1 and the slider 6.

[0041] Reference Figure 2 , Figure 4 and Figure 5 The inner support member 11 includes multiple inner support rings 111 coaxially sleeved on the screw 3. The multiple inner support rings 111 are arranged along the axial direction of the screw 3. The multiple inner support rings 111 are all located between the inner end ring 10 and the slider 6. The circumferential inner sidewall of the inner support ring 111 is attached to the outer sidewall of the screw 3.

[0042] Reference Figure 2 , Figure 4 and Figure 5 The outer circumferential wall of the inner support ring 111 is attached to the inner circumferential wall of the inner tube 8. An inner support spring 112 is provided between each two adjacent inner support rings 111. An inner ring groove 13 is coaxially opened at the end of the inner support ring 111, and the end of the inner support spring 112 is located in the inner ring groove 13.

[0043] Reference Figure 2 , Figure 3 and Figure 4The outer support member 12 includes multiple outer support rings 121 coaxially sleeved on the screw 3. The multiple outer support rings 121 are arranged along the axial direction of the screw 3. The multiple outer support rings 121 are all located between the mounting base 1 and the slider 6. The circumferential inner sidewall of the outer support ring 121 is attached to the outer sidewall of the screw 3.

[0044] Reference Figure 2 , Figure 3 and Figure 4 The outer circumferential outer wall of the outer support ring 121 is attached to the inner circumferential side wall of the outer tube 5. An outer support spring 122 is provided between each two adjacent outer support rings 121. An outer ring groove 14 is coaxially opened at the end of the outer support ring 121, and the end of the outer support spring 122 is located in the outer ring groove 14.

[0045] As the slider 6 moves the inner tube 8 away from the mounting base 1, the slider 6 will compress multiple inner support rings 111 between the inner end ring 10 and the slider 6. The distance between two adjacent inner support rings 111 gradually decreases. At this time, the inner support spring 112 is compressed and deformed. Since the elastic properties of multiple inner support springs 112 tend to be consistent, the distance between two adjacent inner support rings 111 remains the same during the sliding process.

[0046] Since multiple inner support rings 111 are evenly distributed between the inner end ring 10 and the slider 6, the screw 3 between the inner end ring 10 and the slider 6 is dynamically and stably supported. At the same time, under the support of multiple inner support rings 111, the screw 3 between the inner end ring 10 and the slider 6 will form an integral whole with the inner tube 8. The inner tube 8 indirectly increases the diameter of the screw 3, thereby improving the structural strength of the screw 3 in the axial direction.

[0047] The outer support spring 122 between the mounting base 1 and the slider 6 will gradually recover its elastic force, and the multiple outer support rings 121 will slide along the axial direction of the screw 3. Since the elastic properties of the multiple outer support springs 122 tend to be consistent, the multiple outer support rings 121 will be evenly distributed between the mounting base 1 and the slider 6.

[0048] Since the outer circumferential wall of the outer support ring 121 is attached to the inner circumferential wall of the outer tube 5, the multiple outer support rings 121 will provide dynamic and stable support for the screw 3 between the mounting base 1 and the slider 6.

[0049] Meanwhile, under the action of the outer support ring 121, the outer tube 5 indirectly increases the structural strength of the screw 3 between the mounting base 1 and the slider 6, thereby reducing the possibility of bending deformation of the screw 3 between the mounting base 1 and the slider 6. Through the inner support ring 111 and the outer support ring 121, the screw 3 is dynamically supported in the axial direction without increasing the diameter of the screw 3, thereby achieving the purpose of reducing the overall weight of the electric push cylinder.

[0050] Reference Figure 1 , Figure 2 and Figure 6 A protective tube 15 is bolted to the mounting base 1. The motor 2 is located inside the protective tube 15. A cover 16 is bolted to the end of the protective tube 15 facing away from the mounting base 1. Sealing rings 28 are arranged between the mounting base 1 and the protective tube 15, and between the protective tube 15 and the cover 16. The sealing rings 28 can be made of rubber.

[0051] Reference Figure 2 and Figure 6 The protective tube 15 has a pressing groove 17, which presses the movable plate seat 43 onto the mounting seat 1. The motor 2 has a recessed seat 18 welded on it, and the cover 16 has a circular guide post 19 that is coaxial with the protective tube 15. Both the recessed seat 18 and the circular guide post 19 are made of insulating material.

[0052] Reference Figure 2 and Figure 6 The recess 18 has a conductive groove 20 for inserting the circular guide post 19. Multiple conductive rings 21 are arranged coaxially on the circular guide post 19 along its axis. The cover 16 has a bundled wire 22 connected to the conductive rings 21. The bundled wire 22 is composed of multiple wires that are insulated from each other.

[0053] Reference Figure 2 and Figure 6 Multiple stepped grooves 23 are provided on the outer wall of the recess 18. The stepped grooves 23 are connected to the conductive grooves 20. The stepped grooves 23 correspond one-to-one with the conductive rings 21. Graphite electrodes 24 with a T-shaped cross-section are slidably arranged in the stepped grooves 23. The graphite electrodes 24 are electrically connected to the motor 2. Baffles 25 for sealing the stepped grooves 23 are bolted to the outer wall of the recess 18.

[0054] Reference Figure 2 and Figure 6 A tension spring 26 supports the graphite electrode 24 and the baffle 25. A chamfer 27 is provided at one end of the circular guide post 19 near the recess 18. The chamfer 27 of the circular guide post 19 is used to abut and slide with the graphite electrode 24. The tension spring 26 is used to press the graphite electrode 24 tightly onto the conductive ring 21.

[0055] The worker first inserts the movable plate base 43 into the mounting base 1, so that the torque rod 41 at the end of the screw 3 is inserted into the torque groove 42 on the output shaft of the motor 2. Then, the protective tube 15 is tightened, and the clamping groove 17 on the protective tube 15 will press the movable plate base 43 onto the mounting base 1. Finally, the cover 16 is tightened to complete the process of fixing and assembling the motor 2.

[0056] During the tightening of the cap 16, the round guide post 19 gradually inserts into the conductive groove 20 on the recess 18. During this process, the chamfer 27 on the round guide post 19 abuts against and pushes the graphite electrode 24. The graphite electrode 24 compresses the tension spring 26 until the cap 16 is installed in place. At this time, the graphite electrode 24 is pressed against the conductive ring 21 under the action of the tension spring 26, thus realizing the electrical connection between the bundled wires 22 and the motor 2.

[0057] The implementation principle of a split-shell type large-stroke electric push cylinder in this application embodiment is as follows: The worker first inserts the movable plate base 43 into the mounting base 1, so that the torque rod 41 at the end of the screw 3 is inserted into the torque groove 42 on the output shaft of the motor 2. Then, the protective tube 15 is tightened, and the clamping groove 17 on the protective tube 15 will press the movable plate base 43 onto the mounting base 1. Finally, the cover 16 is tightened to complete the process of fixing and assembling the motor 2.

[0058] During the tightening of the cap 16, the round guide post 19 gradually inserts into the conductive groove 20 on the recess 18. During this process, the chamfer 27 on the round guide post 19 abuts against and pushes the graphite electrode 24. The graphite electrode 24 compresses the tension spring 26 until the cap 16 is installed in place. At this time, the graphite electrode 24 is pressed against the conductive ring 21 under the action of the tension spring 26, thus realizing the electrical connection between the bundled wires 22 and the motor 2.

[0059] The output shaft of motor 2 drives screw 3 to rotate through torque rod 41. Under the restriction of slide groove 7, slider 6 drives inner tube 8 to slide along the axis of screw 3. During this process, inner end ring 10 provides stable support between the end of screw 3 away from mounting base 1 and inner tube 8, and outer end ring 9 provides dynamic stable support between the end of outer tube 5 away from mounting base 1 and inner tube 8.

[0060] As the slider 6 moves the inner tube 8 away from the mounting base 1, the slider 6 will compress multiple inner support rings 111 between the inner end ring 10 and the slider 6. The distance between two adjacent inner support rings 111 gradually decreases. At this time, the inner support spring 112 is compressed and deformed. Since the elastic properties of multiple inner support springs 112 tend to be consistent, the distance between two adjacent inner support rings 111 remains the same during the sliding process.

[0061] Since multiple inner support rings 111 are evenly distributed between the inner end ring 10 and the slider 6, the screw 3 between the inner end ring 10 and the slider 6 is dynamically and stably supported. At the same time, under the support of multiple inner support rings 111, the screw 3 between the inner end ring 10 and the slider 6 will form an integral whole with the inner tube 8. The inner tube 8 indirectly increases the diameter of the screw 3, thereby improving the structural strength of the screw 3 in the axial direction.

[0062] The outer support spring 122 between the mounting base 1 and the slider 6 will gradually recover its elastic force, and the multiple outer support rings 121 will slide along the axial direction of the screw 3. Since the elastic properties of the multiple outer support springs 122 tend to be consistent, the multiple outer support rings 121 will be evenly distributed between the mounting base 1 and the slider 6.

[0063] Since the outer circumferential wall of the outer support ring 121 is attached to the inner circumferential wall of the outer tube 5, the multiple outer support rings 121 will provide dynamic and stable support for the screw 3 between the mounting base 1 and the slider 6.

[0064] Meanwhile, under the action of the outer support ring 121, the outer tube 5 indirectly increases the structural strength of the screw 3 between the mounting base 1 and the slider 6, thereby reducing the possibility of bending deformation of the screw 3 between the mounting base 1 and the slider 6. Through the inner support ring 111 and the outer support ring 121, the screw 3 is dynamically supported in the axial direction without increasing the diameter of the screw 3, thereby achieving the purpose of reducing the overall weight of the electric push cylinder.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A split-shell type long-stroke electric cylinder, characterized in that: The system includes a mounting base (1), on which a motor (2) is detachably mounted. A screw (3) is rotatably mounted on the mounting base (1). A torque transmission element (4) is provided between the screw (3) and the motor (2). An outer tube (5) is mounted on the mounting base (1) and coaxially sleeved on the screw (3). A slider (6) with a polygonal cross-section is threaded onto the screw (3). A groove (7) for sliding of the slider (6) is provided on the inner wall of the outer tube (5) along its axial direction. An inner tube (8) is mounted on the slider (6) and coaxially sleeved on the screw (3). An outer end ring (9) is provided between the end of the tube (5) away from the mounting base (1) and the inner tube (8). An inner end ring (10) is coaxially provided at the end of the screw (3) away from the mounting base (1). The inner circumferential sidewall of the inner tube (8) is attached to the outer circumferential sidewall of the inner end ring (10). An inner support member (11) and an outer support member (12) are provided on the slider (6). When the slider (6) slides, the inner support member (11) is used to support the screw (3) between the inner end ring (10) and the slider (6), and the outer support member (12) is used to support the screw (3) between the mounting base (1) and the slider (6). The inner support member (11) includes multiple inner support rings (111) coaxially sleeved on the screw (3). The multiple inner support rings (111) are arranged along the axial direction of the screw (3). The multiple inner support rings (111) are all located between the inner end ring (10) and the slider (6). An inner support spring (112) supports each adjacent two inner support rings (111). The circumferential inner sidewall of the inner support ring (111) is attached to the outer sidewall of the screw (3). The circumferential outer sidewall of the inner support ring (111) is attached to the circumferential inner sidewall of the inner tube (8).

2. The split-shell type long-stroke electric cylinder according to claim 1, characterized in that: The torque component (4) includes a torque rod (41) coaxially mounted on the screw (3). The output shaft of the motor (2) has a torque groove (42) for the torque rod (41) to be inserted into. The cross-sections of the torque rod (41) and the torque groove (42) are both polygonal. A movable plate base (43) is detachably mounted on the mounting base (1), and the motor (2) is mounted on the movable plate base (43).

3. The split-shell type long-stroke electric cylinder according to claim 1, characterized in that: The inner support ring (111) has an inner ring groove (13) coaxially formed at its end, and the end of the inner support spring (112) is located in the inner ring groove (13).

4. A split-shell type long-stroke electric cylinder according to claim 2, characterized in that: The outer support member (12) includes multiple outer support rings (121) coaxially sleeved on the screw (3). The multiple outer support rings (121) are arranged along the axial direction of the screw (3). The multiple outer support rings (121) are all located between the mounting base (1) and the slider (6). An outer support spring (122) supports each adjacent pair of outer support rings (121). The circumferential inner sidewall of the outer support ring (121) is attached to the outer sidewall of the screw (3), and the circumferential outer sidewall of the outer support ring (121) is attached to the circumferential inner sidewall of the outer tube (5).

5. A split-shell type long-stroke electric cylinder according to claim 4, characterized in that: The outer support ring (121) has an outer ring groove (14) coaxially formed at its end, and the end of the outer support spring (122) is located in the outer ring groove (14).

6. A split-shell type long-stroke electric cylinder according to claim 2, characterized in that: A protective tube (15) is bolted to the mounting base (1), and the motor (2) is located inside the protective tube (15). A cap (16) is bolted to one end of the protective tube (15) facing away from the mounting base (1). A pressing groove (17) is provided on the protective tube (15), and the pressing groove (17) on the protective tube (15) presses the movable plate seat (43) onto the mounting base (1).

7. A split-shell type long-stroke electric cylinder according to claim 6, characterized in that: The motor (2) is provided with a recess (18), and the cover (16) is provided with a circular guide post (19) coaxial with the protective tube (15). The recess (18) is provided with a conductive groove (20) for the circular guide post (19) to be inserted. Multiple conductive rings (21) are provided on the circular guide post (19) and coaxially along its axis. The cover (16) is provided with a bundled wire (22) connected to the conductive rings (21). Multiple stepped grooves (23) are provided on the outer wall of the recess (18). The stepped grooves (23) are connected to the conductive grooves (20). Each stepped groove (23) corresponds to one of the conductive rings (21). A graphite electrode (24) is slidably disposed in the stepped groove (23). The graphite electrode (24) is electrically connected to the motor (2). A baffle (25) for sealing the stepped groove (23) is detachably disposed on the outer side wall of the recess (18). A tension spring (26) supports the graphite electrode (24) and the baffle (25). A chamfer (27) is provided at one end of the circular guide post (19) near the recess (18). The chamfer (27) of the circular guide post (19) is used to abut against and slide with the graphite electrode (24). The tension spring (26) is used to press the graphite electrode (24) onto the conductive ring (21).

8. A split-shell type long-stroke electric cylinder according to claim 7, characterized in that: A sealing ring (28) is provided between the outer end ring (9) and the outer tube (5), between the outer end ring (9) and the inner tube (8), between the outer tube (5) and the mounting base (1), between the mounting base (1) and the protective tube (15), and between the protective tube (15) and the cover (16).

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