Lifting type heavy-load electric cylinder

Abstract

The utility model relates to the technical field of electric cylinders, in particular to a lifting type heavy-load electric cylinder which comprises a cylinder barrel and a gear box, the gear box is arranged at the bottom of the cylinder barrel, and a transmission mechanism is arranged in the gear box; the driving rod is coaxially and rotationally connected with the cylinder barrel, and the driving rod penetrates through the bottom of the cylinder barrel and extends into the gearbox; the nut is arranged in the cylinder barrel in a sliding mode in the axial direction of the cylinder barrel, and a piston rod is connected to the nut; the transmission mechanism comprises a fourth gear coaxially connected with the driving rod, and a first tapered roller bearing and a second tapered roller bearing are arranged in the gear box and on the two sides of the fourth gear respectively and used for supporting the driving rod. The supporting structure of the driving rod is directly placed in the gear box, and the first tapered roller bearing and the second tapered roller bearing are arranged on the two sides of the fourth gear correspondingly, so that the purpose of supporting the driving rod is achieved, the length of the axial mounting structure can be reduced, and the stroke length of the piston rod is increased.

Description

Technical Field

[0001] This application relates to the field of electric cylinder technology, and more particularly to a lifting-type heavy-duty electric cylinder. Background Technology

[0002] Gantry robots are used in warehousing and material handling, where there are high-altitude operations, high stroke requirements, and fast speed response. Electric cylinders in gantry robots need to output thrust or pressure to meet the robot's operational needs.

[0003] The stroke of an electric cylinder is related to its diameter and cylinder length. To ensure the stability of the lead screw installation, existing electric cylinders typically have a bearing housing between the cylinder bottom and the gearbox of the transmission mechanism to support the lead screw (e.g., ...). Figure 1 As shown in the diagram, this structure results in a large overall size for the electric cylinder, a short cylinder barrel length, and a short output stroke. Electric cylinder structures subjected to thrust are limited in both stroke and thrust due to the stability parameters of the pressure rod, requiring larger structural dimensions and a smaller stroke design. However, when the electric cylinder is only subjected to tension, a large stroke is needed to meet customer requirements, but space constraints make it difficult for existing electric cylinders to meet this need.

[0004] Meanwhile, electric cylinders require lubrication maintenance. Conventional electric cylinders are lubricated manually. In high-altitude operations, manual lubrication requires going to a high altitude, which takes a long time, increasing time costs, operational difficulty, and potential safety hazards. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the electric cylinder is limited in achieving large stroke output when subjected to only tensile force in a limited space.

[0006] Therefore, this utility model provides a lifting-type heavy-duty electric cylinder.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A lifting-type heavy-duty electric cylinder includes,

[0009] Cylinder, and

[0010] A gearbox is located at the bottom of the cylinder, and a transmission mechanism is installed inside the gearbox;

[0011] A drive rod, which is rotatably connected to the cylinder barrel on the same axis, and extends through the bottom of the cylinder barrel into the gearbox;

[0012] A nut, which is slidably disposed inside the cylinder along the axial direction of the cylinder, and a piston rod is connected to the nut;

[0013] The transmission mechanism includes a fourth gear coaxially connected to the drive rod. Inside the gearbox, a first tapered roller bearing and a second tapered roller bearing are respectively provided on both sides of the fourth gear to support the drive rod.

[0014] Furthermore, the gearbox has an opening on the side away from the cylinder, and a cover is provided on the opening side of the gearbox.

[0015] Furthermore, a bearing inner sleeve is provided on the side of the fourth gear near the cylinder, and the bearing inner sleeve is coaxially sleeved on the part of the drive rod located inside the gearbox.

[0016] Furthermore, the first tapered roller bearing is installed between the fourth gear and the gearbox cover, and the first tapered roller bearing is connected to the gearbox cover. The second tapered roller bearing is disposed between the bearing inner sleeve and the inner wall of the gearbox.

[0017] Furthermore, the transmission mechanism also includes a first gear, a second gear, and a third gear. The first gear is rotatably connected to the gearbox via a mounting shaft, and the second and third gears are rotatably connected to the gearbox via a transmission shaft. The transmission shaft is located between the mounting shaft and the drive rod. The axes of the mounting shaft, the drive rod, and the transmission shaft are all parallel to each other. The second and third gears are coaxially connected to the transmission shaft. The second gear meshes with the first gear, and the third gear meshes with the fourth gear.

[0018] Furthermore, a handwheel is rotatably connected to the box cover, and the handwheel is inserted into the drive shaft.

[0019] Furthermore, the gearbox is connected to oil pipes and a grease distributor. Multiple oil pipes are provided, and each oil pipe is connected to a different output end of the grease distributor. A plunger pump is connected to the input end of the grease distributor.

[0020] Furthermore, an anti-rotation rod is provided inside the cylinder, which cooperates with the nut to prevent the nut from rotating.

[0021] The beneficial effects of this utility model are that it eliminates the bearing seat located between the cylinder and the gearbox, placing the drive rod support structure directly inside the gearbox. The first and second tapered roller bearings are respectively positioned on both sides of the fourth gear, achieving the purpose of supporting the drive rod while reducing the length of the axial mounting structure and shortening the overall length of the electric cylinder, thereby increasing the piston rod stroke. Furthermore, since the electric cylinder only bears tensile force, a smaller size of the first tapered roller bearing can be used, reducing the overall cost of the electric cylinder and further reducing the axial structural length.

[0022] This application enables a plunger pump to centrally supply oil to the grease distributor, and the grease distributor further divides the grease into independent oil circuits to supply oil to gears, bearings and cylinders. This oil supply method is convenient, safe and efficient, and enhances the self-maintenance function of the electric cylinder. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of an existing thrust-driven electric cylinder structure in the background art.

[0025] Figure 2 This is a schematic diagram of the lifting-type heavy-duty electric cylinder in this utility model.

[0026] Figure 3 This is a schematic diagram of the grease distribution path in this utility model.

[0027] In the diagram: 1. Actuation mechanism; 10. Bearing housing; 11. Cylinder; 12. Nut; 13. Drive rod; 14. Piston rod; 15. Guide sleeve; 16. Rod head; 17. Anti-rotation rod; 2. Transmission mechanism; 21. Mounting shaft; 22. Drive shaft; 23. First gear; 24. Second gear; 25. Third gear; 26. Fourth gear; 3. First tapered roller bearing; 4. Second tapered roller bearing; 5. Bearing inner sleeve; 6. Gearbox; 7. Gearbox cover; 71. Hand crank; 8. Oil pipe; 9. Grease distributor. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Reference Figure 2 A lifting-type heavy-duty electric cylinder includes an actuation mechanism 1 and a transmission mechanism 2, wherein an external drive device controls the operation of the braking mechanism through the transmission mechanism 2.

[0032] The actuation mechanism 1 includes a cylinder 11, a nut 12, a drive rod 13, a piston rod 14, a guide sleeve 15, a rod head 16, and an anti-rotation rod 17. The drive rod 13 is a ball screw, coaxially rotatably connected inside the cylinder 11. The nut 12 is slidably disposed inside the cylinder 11 along the axial direction of the cylinder 11. The nut 12 is coaxially sleeved on the ball screw and threadedly engaged with the ball screw. The anti-rotation rod 17 is disposed inside the cylinder 11 to prevent the nut 12 from rotating. The piston rod 14 is sleeved on the drive rod 13 and passes through the cylinder opening of the cylinder 11. The piston rod 14 is fixedly connected to the nut 12. One end of the piston rod 14 that extends out of the cylinder opening of the cylinder 11 is connected to the rod head 16. The guide sleeve 15 is disposed between the piston rod 14 and the cylinder opening of the cylinder 11. The piston rod 14 passes through the guide sleeve 15 and is slidably connected to the guide sleeve 15 along the axial direction of the cylinder 11.

[0033] The bottom of the cylinder 11 is connected to a gearbox 6. The gearbox 6 is provided with a mounting surface for connecting an external drive device. The transmission mechanism 2 is located inside the gearbox 6. The side of the gearbox 6 away from the cylinder 11 is set as an opening to facilitate the installation and maintenance of the transmission mechanism 2 inside. The gearbox 6 is covered with a cover 7 on the opening side. The transmission mechanism 2 includes a first gear 23, a second gear 24, a third gear 25 and a fourth gear 26.

[0034] One end of the drive rod 13 passes through the bottom of the cylinder 11 and extends into the gearbox 6. The fourth gear 26 is coaxially connected to the portion of the drive rod 13 located inside the gearbox 6. The first gear 23 is rotatably connected to the gearbox 6 via a mounting shaft 21, which is used to connect to an external drive device. The second gear 24 and the third gear 25 are rotatably connected to the gearbox 6 via a transmission shaft 22, which is located between the mounting shaft 21 and the drive rod 13. The axes of the mounting shaft 21, the drive rod 13, and the transmission shaft 22 are all parallel to each other. The second gear 24 and the third gear 25 are coaxially connected to the transmission shaft 22. The second gear 24 meshes with the first gear 23, and the third gear 25 meshes with the fourth gear 26. The hand crank 71 is rotatably connected to the cover plate and is inserted into the transmission shaft 22. The shaft, the mounting shaft 21, and the gearbox 6 are all connected via deep groove ball bearings, as are the shaft, the mounting shaft 21, and the gearbox cover 7.

[0035] The first gear 23, the second gear 24, the third gear 25, and the fourth gear 26 can be designed with different types of gear pairs according to the required speed ratio to meet the needs of various load speeds. This eliminates the need for a reducer, compresses the overall size of the electric cylinder, and reduces costs. At the same time, in tension conditions, there is no need to consider the safety factor of the pressure rod stability, and a longer stroke can be designed.

[0036] A bearing inner sleeve 5 is provided on the side of the fourth gear 26 near the cylinder 11. The bearing inner sleeve 5 is coaxially sleeved on the part of the drive rod 13 located inside the gearbox 6. A first tapered roller bearing 3 and a second tapered roller bearing 4 are respectively provided on both sides of the fourth gear 26. The first tapered roller bearing 3 is installed between the fourth gear 26 and the gearbox cover 7, and the second tapered roller bearing 4 is located between the bearing inner sleeve 5 and the inner wall of the gearbox 6.

[0037] During installation, the second tapered roller bearing 4 is installed with the gearbox 6, and the first tapered roller bearing 3 is installed with the cover 7. The second tapered roller bearing 4 is connected to the first tapered roller bearing 3 via the fourth gear 26 and the bearing inner sleeve 5. The gearbox 5 and the cover 7 are connected with screws, which can simultaneously press the first tapered roller bearing 3 and the second tapered roller bearing 4 together.

[0038] Furthermore, such as Figure 3 As shown, the gearbox 6 is connected to an oil pipe 8 and a grease distributor 9. There are multiple oil pipes 8, which are connected to different output ends of the grease distributor 9. The input end of the grease distributor 9 is connected to a plunger pump.

[0039] The oil is supplied centrally by a plunger pump and distributed to different oil pipes 8 by a grease distributor 9. These oil pipes 8 are connected to the grease injection structures inside the gears, bearings, and cylinder 11. Equipped with a circulation indicator, the oil can be supplied to different parts according to the control commands of the plunger pump. This oil supply structure is convenient and quick, and enhances the self-maintenance function of the electric cylinder.

[0040] This application eliminates the bearing housing 10 located between the cylinder 11 and the gearbox 6, placing the support structure for the drive rod 13 directly inside the gearbox 6. The first tapered roller bearing 3 and the second tapered roller bearing 4 are respectively positioned on both sides of the fourth gear 26. This achieves the purpose of supporting the drive rod 13 while reducing the length of the axial mounting structure and shortening the overall length of the electric cylinder, thereby increasing the stroke length of the piston rod 14. After the second tapered roller bearing 4 is installed on the side of the gearbox 6 housing, the cover 7 is placed on the gearbox 6, simultaneously pressing the first tapered roller bearing 3 and the second tapered roller bearing 4 together, thus completing the bearing pairing. No additional locking parts are needed, and no torque adjustment is required, reducing installation difficulty. Furthermore, since the electric cylinder only bears tensile force, a smaller model of the first tapered roller bearing 3 can be used, reducing the overall cost of the electric cylinder and further reducing the axial structural length.

[0041] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A lifting-type heavy-duty electric cylinder, characterized in that, include, Cylinder (11), and A gearbox (6) is provided at the bottom of the cylinder (11), and a transmission mechanism (2) is provided inside the gearbox (6); Drive rod (13), which is coaxially rotatably connected to cylinder (11), and extends through the bottom of cylinder (11) into gearbox (6); Nut (12), which is slidably disposed in the cylinder (11) along the axial direction of the cylinder (11), and a piston rod (14) is connected to the nut (12); The transmission mechanism (2) includes a fourth gear (26) coaxially connected to the drive rod (13). Inside the gearbox (6), a first tapered roller bearing (3) and a second tapered roller bearing (4) are respectively provided on both sides of the fourth gear (26) to support the drive rod (13).

2. The lifting-type heavy-duty electric cylinder according to claim 1, characterized in that, The gearbox (6) is provided with an opening on the side away from the cylinder (11), and a cover (7) is provided on the opening side of the gearbox (6).

3. The lifting-type heavy-duty electric cylinder according to claim 1, characterized in that, The fourth gear (26) is provided with a bearing inner sleeve (5) on the side near the cylinder (11), and the bearing inner sleeve (5) is coaxially sleeved on the part of the drive rod (13) located inside the gearbox (6).

4. The lifting-type heavy-duty electric cylinder according to claim 3, characterized in that, The first tapered roller bearing (3) is installed between the fourth gear (26) and the housing cover (7). The first tapered roller bearing (3) is connected to the housing cover (7). The second tapered roller bearing (4) is disposed between the bearing inner sleeve (5) and the inner wall of the gearbox (6).

5. The lifting-type heavy-duty electric cylinder according to claim 2, characterized in that, The transmission mechanism (2) further includes a first gear (23), a second gear (24), and a third gear (25). The first gear (23) is rotatably connected to the gearbox (6) via a mounting shaft (21). The second gear (24) and the third gear (25) are rotatably connected to the gearbox (6) via a transmission shaft (22). The transmission shaft (22) is located between the mounting shaft (21) and the drive rod (13). The axial directions of the mounting shaft (21), the drive rod (13), and the transmission shaft (22) are all parallel to each other. The second gear (24) and the third gear (25) are coaxially connected to the transmission shaft (22). The second gear (24) meshes with the first gear (23), and the third gear (25) meshes with the fourth gear (26).

6. The lifting-type heavy-duty electric cylinder according to claim 5, characterized in that, A hand crank (71) is rotatably connected to the box cover (7), and the hand crank (71) is inserted into the drive shaft (22).

7. The lifting-type heavy-duty electric cylinder according to claim 1, characterized in that, The gearbox (6) is connected to an oil pipe (8) and a grease distributor (9). There are multiple oil pipes (8), and each oil pipe (8) is connected to a different output end of the grease distributor (9). The input end of the grease distributor (9) is connected to a plunger pump.

8. The lifting-type heavy-duty electric cylinder according to claim 1, characterized in that, An anti-rotation rod (17) is provided inside the cylinder (11), and the anti-rotation rod (17) cooperates with the nut (12) to prevent the nut (12) from rotating.

Images