A three-section push rod

Abstract

This application relates to a three-section push rod, comprising: a primary rod, including a fixed seat, a fixed lead screw, a splined shaft, a sliding seat, and a primary guide tube; the fixed lead screw is threadedly connected to a transmission gear; a splined gear sleeve is provided on the splined shaft; the transmission gear is rotatably mounted on the sliding seat; the splined gear sleeve is rotatably mounted on the sliding seat; the transmission gear meshes with the splined gear sleeve; a secondary rod, including a movable lead screw, a lead screw nut seat, and a secondary guide tube; a lead screw nut gear is mounted on the movable lead screw; the lead screw nut gear is rotatably mounted on the sliding seat and meshes with the transmission gear; the lead screw nut seat is threadedly connected to the movable lead screw; a tertiary rod, including a tertiary guide tube; and a drive component, which is drively connected to the splined shaft. This utility model's three-section push rod improves lateral load capacity.

Description

Technical Field

[0001] This application relates to the technical field of self-loading and unloading container equipment, and in particular to a three-section push rod. Background Technology

[0002] Currently, multi-stage actuators are widely used in various industries and have led to the development of electric cylinders with various structural forms. For example, they can be used as outriggers in self-loading and unloading container equipment. Traditional multi-stage actuators, as can be seen in the utility model patent with announcement number CN211089340U, generally employ a structure of multiple coaxially arranged, nested threaded rods to achieve multi-stage drive. However, this structural form requires strict coaxiality between the threaded rods. Even slight deformation due to lateral loads will result in failure to transmit power normally. Furthermore, the nested form necessitates the use of hollow structures for some threaded rods, further reducing their bending resistance and making them prone to lateral deformation.

[0003] Therefore, there is a need for a three-section push rod that can improve lateral load capacity. Utility Model Content

[0004] Therefore, it is necessary to provide a three-section push rod, the specific technical solution of which is as follows.

[0005] A three-section putter includes: A primary rod includes a fixed base, a fixed lead screw, a splined shaft, a sliding seat, and a primary guide tube; the fixed lead screw is mounted on the fixed base and threadedly connected to a transmission gear; the splined shaft is rotatably mounted on the fixed base and is equipped with a splined sleeve gear; the transmission gear is rotatably mounted on the sliding seat, driving the sliding seat to move; the splined sleeve gear is rotatably mounted on the sliding seat and moves with the sliding seat; the transmission gear meshes with the splined sleeve gear; the primary guide tube is sleeved on the fixed base. The secondary rod includes a movable lead screw, a lead screw nut seat, and a secondary guide tube; a lead screw nut gear is mounted on the movable lead screw; the lead screw nut gear is rotatably mounted on a sliding seat, moves with the sliding seat, and meshes with a transmission gear; the lead screw nut seat is threadedly connected to the movable lead screw; the secondary guide tube is sleeved on the sliding seat; The third-stage rod includes a third-stage conduit, which is sleeved on the lead screw nut seat; The driving component is connected to the splined shaft drive.

[0006] Furthermore, the fixed lead screw, spline shaft, and movable lead screw are parallel to each other.

[0007] Furthermore, the sliding seat includes a first seat body, a second seat body, and a connecting plate, wherein the first seat body and the second seat body are arranged at intervals, and the connecting plate is connected to the first seat body and the second seat body respectively.

[0008] Furthermore, the two ends of the splined gear are respectively provided with a first extension; the first base is provided with a first mounting hole, and a first positioning surface is provided in the first mounting hole; the second base is provided with a second mounting hole, and a second positioning surface is provided in the second mounting hole; the two first extensions extend into the first mounting hole and the second mounting hole respectively, and are respectively connected to a first bearing; the first bearing abuts against the first positioning surface or the second positioning surface.

[0009] Furthermore, the transmission gear has a second extension at each end; the first base has a third mounting hole, and the third mounting hole has a third positioning surface; the second base has a fourth mounting hole, and the fourth mounting hole has a fourth positioning surface; the two second extensions extend into the third mounting hole and the fourth mounting hole respectively, and are respectively connected to a second bearing; the second bearing abuts against the third positioning surface or the fourth positioning surface.

[0010] Furthermore, the two ends of the lead screw nut gear are respectively provided with third extensions; the first base is provided with a fifth mounting hole, and the fifth mounting hole is provided with a fifth positioning surface; the second base is provided with a sixth mounting hole, and the sixth mounting hole is provided with a sixth positioning surface; the two third extensions extend into the fifth mounting hole and the sixth mounting hole respectively, and are respectively connected to a third bearing; the third bearing abuts against the fifth positioning surface or the sixth positioning surface.

[0011] Furthermore, the second base body is provided with an extension portion; the sixth mounting hole penetrates the extension portion; multiple auxiliary bearings are provided in the sixth mounting hole, and the auxiliary bearings are sleeved on the movable lead screw; a bushing is provided between adjacent auxiliary bearings.

[0012] Furthermore, the lead screw nut seat is provided with a first clearance hole and a second clearance hole respectively; the spline shaft passes through the first clearance hole, and the fixed lead screw passes through the second clearance hole.

[0013] Furthermore, the primary, secondary, and tertiary catheters are all rectangular tubes.

[0014] Furthermore, the first-stage conduit is provided with a first limiting end at its end to prevent the sliding seat from disengaging from the first-stage conduit; the second-stage conduit is provided with a second limiting end at its end to prevent the screw nut seat from disengaging from the second-stage conduit.

[0015] Beneficial effects: The three-section push rod provided by this utility model has a solid structure for its internal fixed lead screw, spline shaft, and movable lead screw, which has strong bending resistance and can withstand greater lateral loads; even if the push rod undergoes slight lateral deformation, the impact on transmission is relatively small, further improving the lateral load capacity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the three-section push rod; Figure 2 This is a schematic diagram of the internal structure of a three-section push rod; Figure 3 This is one of the partial sectional views of a three-section push rod; Figure 4 This is the second partial sectional view of the three-section push rod; Figure 5 This is a schematic diagram of the three-section push rod in its retracted state; Figure 6 This is a schematic diagram of the three-section push rod in its extended state.

[0018] Explanation of reference numerals in the attached diagram: 1. First-order member; 2. Second-order member; 3. Third-order member; 4. Driving member; 11. Fixed seat; 12. Fixed lead screw; 13. Splined shaft; 14. Sliding seat; 15. Primary guide tube; 16. Transmission gear; 17. Splined sleeve gear; 141. First bearing; 142. Second bearing; 143. Connecting plate; 144. First bearing; 145. Second bearing; 146. Third bearing; 147. Auxiliary bearing; 148. Bushing; 1411, First mounting hole; 1412, First positioning surface; 1413, Third mounting hole; 1414, Third positioning surface; 1415, Fifth mounting hole; 1416, Fifth positioning surface; 1421. Second mounting hole; 1422. Second positioning surface; 1423. Fourth mounting hole; 1424. Fourth positioning surface; 1425. Sixth mounting hole; 1426. Sixth positioning surface; 1427. Extension; 21. Movable lead screw; 22. Lead screw nut seat; 23. Secondary guide tube; 24. Lead screw nut gear; 31. Grade III catheter; 41. Sprockets; 42. Chains. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] Example Reference Figure 1 and Figure 2 As shown, this embodiment provides a three-section push rod, including a primary rod 1, a secondary rod 2, and a tertiary rod 3. The primary rod 1 includes a fixed base 11, a fixed lead screw 12, a splined shaft 13, a sliding seat 14, and a primary guide tube 15. The fixed lead screw 12 is mounted on the fixed base 11 and threadedly connected to a transmission gear 16. The splined shaft 13 is rotatably mounted on the fixed base 11 and is equipped with a splined sleeve gear 17. The transmission gear 16 is rotatably mounted on the sliding seat 14, driving the sliding seat 14 to move. The splined sleeve gear 17 is rotatably mounted on the sliding seat 14 and moves with the sliding seat 14. The transmission gear 16 meshes with the splined sleeve gear 17. The primary guide tube 15 is sleeved on the fixed base 11.

[0026] A keyway extending along the axial direction is provided on the surface of the spline shaft 13, and a key that mates with the keyway is provided on the inner wall of the spline gear 17, so that the spline shaft 13 can drive the spline gear 17 to rotate, and the spline gear 17 can move along the length direction of the spline shaft 13. When the spline shaft 13 rotates, it drives the spline gear 17 to rotate, thereby driving the transmission gear 16 to rotate. When the transmission gear 16 rotates, it moves along the axial direction of the fixed lead screw 12, thereby driving the sliding seat 14 to move. The movement of the sliding seat 14 drives the spline gear 17 to move, ensuring that the spline gear 17 and the transmission gear 16 always maintain a meshed transmission state.

[0027] Specifically, the secondary rod 2 includes a movable lead screw 21, a lead screw nut seat 22, and a secondary guide tube 23. A lead screw nut gear 24 is mounted on the movable lead screw 21. The lead screw nut gear 24 is rotatably mounted on a sliding seat 14, moves with the sliding seat 14, and meshes with a transmission gear 16. The lead screw nut seat 22 is threadedly connected to the movable lead screw 21. The secondary guide tube 23 is sleeved on the sliding seat 14. During the movement of the sliding seat 14, the secondary guide tube 23 moves, achieving its extension and retraction. This movement also drives the movable lead screw 21 and the lead screw nut gear 24. The lead screw nut gear 24 meshes with the transmission gear 16, causing the transmission gear 16 to rotate, which in turn drives the movable lead screw 21 to rotate, thereby driving the lead screw nut seat 22 to move.

[0028] Specifically, the third-stage rod 3 includes a third-stage conduit 31, which is sleeved on the lead screw nut seat 22. When the lead screw nut seat 22 moves, it drives the third-stage conduit 31 to move, thereby realizing the extension and retraction of the third-stage conduit 31.

[0029] The drive component 4 is connected to the spline shaft 13 and drives the spline shaft 13 to rotate. By controlling the drive component 4 to drive the spline shaft 13 to rotate forward or backward, the three-section push rod can be extended or shortened. In this embodiment, the drive component 4 can be a motor. The motor and the spline shaft 13 can be driven by a sprocket 41 and a chain 42.

[0030] The three-section push rod provided in this embodiment has a solid structure for its internal fixed lead screw 12, spline shaft 13, and movable lead screw 21, which has strong bending resistance and can withstand greater lateral loads. Even if the push rod undergoes slight lateral deformation, the impact on the transmission is relatively small, further improving the lateral load capacity.

[0031] Specifically, the fixed lead screw 12, splined shaft 13, and movable lead screw 21 are parallel to each other. Under normal conditions, the three remain parallel, and even with slight bending, the extension and retraction of the three-section push rod can still be achieved.

[0032] Specifically, continue to refer to Figure 2 As shown, the sliding seat 14 includes a first seat body 141, a second seat body 142, and a connecting plate 143. The first seat body 141 and the second seat body 142 are arranged at intervals, and the connecting plate 143 is connected to the first seat body 141 and the second seat body 142 respectively. Space is reserved between the first seat body 141 and the second seat body 142 for installing the splined sleeve gear 17, the transmission gear 16, and the lead screw nut gear 24.

[0033] Specifically, refer to Figure 3As shown, the splined gear 17 has first extensions at both ends; the first base 141 has a first mounting hole 1411, and a first positioning surface 1412 is provided inside the first mounting hole 1411; the second base 142 has a second mounting hole 1421, and a second positioning surface 1422 is provided inside the second mounting hole 1421; the two first extensions extend into the first mounting hole 1411 and the second mounting hole 1421 respectively, and are respectively connected to a first bearing 144; the first bearing 144 abuts against the first positioning surface 1412 or the second positioning surface 1422. The splined gear 17 is rotatably connected to the sliding seat 14 through the first bearing 144, and the first positioning surface 1412 and the second positioning surface 1422 ensure that the splined gear 17 moves with the sliding seat 14.

[0034] Specifically, refer to Figure 3 As shown, the transmission gear 16 has second extensions at both ends; the first seat 141 has a third mounting hole 1413, and a third positioning surface 1414 is provided inside the third mounting hole 1413; the second seat 142 has a fourth mounting hole 1423, and a fourth positioning surface 1424 is provided inside the fourth mounting hole 1423; the two second extensions extend into the third mounting hole 1413 and the fourth mounting hole 1423 respectively, and are respectively connected to a second bearing 145; the second bearing 145 abuts against the third positioning surface 1414 or the fourth positioning surface 1424. The transmission gear 16 is rotatably connected to the sliding seat 14 through the second bearing 145, and the third positioning surface 1414 and the fourth positioning surface 1424 ensure that the transmission gear 16 moves with the sliding seat 14.

[0035] Specifically, refer to Figure 4 As shown, the lead screw nut gear 24 has third extensions at both ends; the first base 141 has a fifth mounting hole 1415, and a fifth positioning surface 1416 is provided inside the fifth mounting hole 1415; the second base 142 has a sixth mounting hole 1425, and a sixth positioning surface 1426 is provided inside the sixth mounting hole 1425; the two third extensions extend into the fifth mounting hole 1415 and the sixth mounting hole 1425 respectively, and are respectively connected to a third bearing 146; the third bearing 146 abuts against the fifth positioning surface 1416 or the sixth positioning surface 1426. The lead screw nut gear 24 is connected to the sliding seat 14 through the third bearing 146, and the fifth positioning surface 1416 and the sixth positioning surface 1426 ensure that the lead screw nut gear 24 moves with the sliding seat 14.

[0036] Specifically, the second base 142 is provided with an extension 1427; the sixth mounting hole 1425 passes through the extension 1427; a plurality of auxiliary bearings 147 are provided in the sixth mounting hole 1425, and the auxiliary bearings 147 are sleeved on the movable lead screw 21; a bushing 148 is provided between adjacent auxiliary bearings 147. This improves the bending resistance of the movable lead screw 21.

[0037] Specifically, the lead screw nut seat 22 is provided with a first clearance hole and a second clearance hole; the spline shaft 13 passes through the first clearance hole, and the fixed lead screw 12 passes through the second clearance hole. This ensures that the three-section push rod can be retracted normally.

[0038] Specifically, the primary conduit 15, secondary conduit 23, and tertiary conduit 31 are all rectangular tubes. This further improves the bending resistance of the three-section push rod.

[0039] Specifically, the first-stage conduit 15 has a first limiting end at its end to prevent the sliding seat 14 from disengaging from the first-stage conduit 15; the second-stage conduit 23 has a second limiting end at its end to prevent the screw nut seat 22 from disengaging from the second-stage conduit 23. This limits the maximum formation of the three-section push rod and prevents disengagement between the various stages of the rod.

[0040] Working principle: When the three-section push rod extends or retracts, the drive component 4 drives the spline shaft 13 to rotate, which in turn drives the spline sleeve gear 17 to rotate, thereby driving the transmission gear 16 to rotate. Since the fixed lead screw 12 remains fixed, the transmission gear 16 moves along the axis of the fixed lead screw 12 when it rotates, thereby driving the sliding seat 14 to move. When the sliding seat 14 moves, it drives the spline sleeve gear 17 to move, thus ensuring that the spline sleeve gear 17 and the transmission gear 16 are always in transmission engagement. When the sliding seat 14 moves, it also drives the movable lead screw 21 and the lead screw nut gear 24 to move. At the same time, when the transmission gear 16 rotates, it drives the lead screw nut gear 24 to rotate, thereby driving the lead screw nut seat 22 to move, realizing the extension and retraction of the three-section push rod.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A three-section push rod, characterized in that, include: A primary rod includes a fixed base, a fixed lead screw, a splined shaft, a sliding seat, and a primary guide tube; the fixed lead screw is mounted on the fixed base and threadedly connected to a transmission gear; the splined shaft is rotatably mounted on the fixed base and is equipped with a splined sleeve gear; the transmission gear is rotatably mounted on the sliding seat, driving the sliding seat to move; the splined sleeve gear is rotatably mounted on the sliding seat and moves with the sliding seat; the transmission gear meshes with the splined sleeve gear; the primary guide tube is sleeved on the fixed base. The secondary rod includes a movable lead screw, a lead screw nut seat, and a secondary guide tube; a lead screw nut gear is mounted on the movable lead screw; the lead screw nut gear is rotatably mounted on a sliding seat, moves with the sliding seat, and meshes with a transmission gear; the lead screw nut seat is threadedly connected to the movable lead screw; the secondary guide tube is sleeved on the sliding seat; The third-stage rod includes a third-stage conduit, which is sleeved on the lead screw nut seat; The driving component is connected to the splined shaft drive.

2. A three-section push rod according to claim 1, characterized in that, The fixed lead screw, splined shaft, and movable lead screw are parallel to each other.

3. A three-section push rod according to claim 1, characterized in that, The sliding seat includes a first seat body, a second seat body, and a connecting plate. The first seat body and the second seat body are arranged at intervals, and the connecting plate is connected to the first seat body and the second seat body respectively.

4. A three-section push rod according to claim 3, characterized in that, The splined gear has a first extension at each end; the first base has a first mounting hole and a first positioning surface inside the first mounting hole; the second base has a second mounting hole and a second positioning surface inside the second mounting hole; the two first extensions extend into the first mounting hole and the second mounting hole respectively, and are respectively connected to a first bearing; the first bearing abuts against the first positioning surface or the second positioning surface.

5. A three-section push rod according to claim 3, characterized in that, The transmission gear has a second extension at each end; the first base has a third mounting hole, and the third mounting hole has a third positioning surface; the second base has a fourth mounting hole, and the fourth mounting hole has a fourth positioning surface; the two second extensions extend into the third mounting hole and the fourth mounting hole respectively, and are respectively connected to a second bearing; the second bearing abuts against the third positioning surface or the fourth positioning surface.

6. A three-section push rod according to claim 3, characterized in that, The lead screw nut gear has a third extension at both ends; the first base has a fifth mounting hole and a fifth positioning surface inside the fifth mounting hole; the second base has a sixth mounting hole and a sixth positioning surface inside the sixth mounting hole; the two third extensions extend into the fifth mounting hole and the sixth mounting hole respectively, and are respectively connected to a third bearing; the third bearing abuts against the fifth positioning surface or the sixth positioning surface.

7. A three-section push rod according to claim 6, characterized in that, The second base is provided with an extension; the sixth mounting hole passes through the extension; multiple auxiliary bearings are provided in the sixth mounting hole, and the auxiliary bearings are sleeved on the movable lead screw; a bushing is provided between adjacent auxiliary bearings.

8. A three-section push rod according to claim 1, characterized in that, The lead screw nut seat is provided with a first clearance hole and a second clearance hole respectively; the spline shaft passes through the first clearance hole and the fixed lead screw passes through the second clearance hole.

9. A three-section push rod according to claim 1, characterized in that, The primary, secondary, and tertiary catheters are all rectangular tubes.

10. A three-section push rod according to claim 1, characterized in that, The first-stage conduit has a first limiting end at its end, which is used to prevent the sliding seat from disengaging from the first-stage conduit; the second-stage conduit has a second limiting end at its end, which is used to prevent the screw nut seat from disengaging from the second-stage conduit.

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