A leg rotating mechanism

Abstract

The application discloses a support leg rotating mechanism, which comprises a rotating shaft and a sleeve, the rotating shaft is inserted into the sleeve, and the rotating shaft and the sleeve are coaxial, a rotating guide mechanism is arranged in the rotating shaft and the sleeve, a grommet is arranged between the sleeve and the rotating shaft at the right end of the sleeve, the inner and outer sides of the grommet are in contact with the outer side of the rotating shaft and the inner side of the sleeve respectively, and a limiting mechanism is arranged between the grommet and the sleeve to prevent the grommet from separating from the sleeve. By arranging the grommet between the rotating shaft and the sleeve, the installation gap between the rotating shaft and the sleeve is effectively compensated and reduced, the rotating shaft will not be obviously deformed due to local extrusion when being stressed, the coaxiality of the rotating shaft and the sleeve is maintained, the jamming or early failure caused by the axis deviation is avoided, and the reliability and service life of the support leg rotating mechanism are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of transportation equipment technology and relates to a rotating mechanism for the support legs of a cargo box. Background Technology

[0002] When unloading cargo from a van, the entire cargo box is separated from the frame. To separate the cargo box, telescopic legs on both sides of the cargo box are activated to lift the cargo box, thereby separating the cargo box from the frame. Existing cargo box and frame separation structures include, for example, the invention patent application previously submitted by our company, patent number 2023224702320, entitled "A Cargo Vehicle Landing Loading and Unloading Structure". This technical solution includes horizontal support legs and vertical support legs. When the vertical support legs are not in use, they are retracted into the cargo box recess. When in use, they are extended by the horizontal support legs, and then extended to lift the cargo box, thereby achieving separation of the cargo box from the frame. Chinese invention patent CN220865392U discloses a landing support leg for a van, including a leg fixed to the bottom of the van, a telescopic component mounted on the leg, and a rotating structure that allows the telescopic component to rotate relative to the leg. The rotating structure includes a guide structure and an anti-rotation structure that positions the telescopic component after rotation. The guide structure includes a guide groove formed on a section of the leg near its end, and a limit post is provided on the telescopic component corresponding to the guide groove. The anti-rotation structure includes a first positioning member fixed inside the leg and a second positioning member provided on the telescopic component. The first and second positioning members can be nested together. This technical solution, by forming a guide groove in the leg, allows the telescopic leg to extend to both sides of the van while rotating, enabling the telescopic leg to be tilted or retracted horizontally without occupying van space or affecting driving or maintenance. However, in the above-mentioned existing technical solutions, the gap between the shaft and the sleeve is relatively large. When the outrigger is subjected to the device or a large weighing pressure, the shaft may deform, causing the axis of the shaft and the axis of the sleeve to no longer be collinear, which in turn affects the normal use of the shaft. Summary of the Invention

[0003] In view of the problem that the gap between the shaft and the sleeve is large in the existing technical solution, the shaft may deform when the outrigger is subjected to the device or a large weighing pressure, causing the axis of the shaft to no longer be collinear with the axis of the sleeve, thus affecting the normal use of the shaft, the present invention proposes an outrigger rotation mechanism, which effectively solves the problem that the gap between the shaft and the sleeve is large in the existing technology, and the shaft may deform when the outrigger is subjected to the device or a large weighing pressure, causing the axis of the shaft to no longer be collinear with the axis of the sleeve, thus affecting the normal use of the shaft.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a leg rotation mechanism, comprising a rotating shaft and a sleeve, wherein the rotating shaft is inserted into the sleeve and the rotating shaft and the sleeve are arranged coaxially, a rotation guide mechanism is provided inside the rotating shaft and the sleeve, a pad is inserted at the right end of the sleeve and located between the sleeve and the rotating shaft, the inner and outer sides of the pad are in contact with the outer side of the rotating shaft and the inner side of the sleeve respectively, and a limiting mechanism is provided between the pad and the sleeve to prevent the pad from detaching from the sleeve.

[0005] Furthermore, the limiting mechanism includes four limiting blocks disposed on the inner side of the sleeve. The four limiting blocks are arranged in a ring around the axis of the sleeve. The outer side of the pad has four limiting grooves arranged in a ring array. The four limiting blocks are respectively inserted into the four limiting grooves. The limiting grooves are connected to the left side of the pad. The right end of the limiting groove is straight and the left end is threaded.

[0006] Furthermore, an annular protrusion is provided at the right end of the outer side of the pad sleeve, and the annular protrusion contacts the right side surface of the sleeve.

[0007] Furthermore, a magnetic pad is provided on the right side of the sleeve, and the annular protrusion is made of soft magnetic low-carbon steel.

[0008] Furthermore, the rotary guide mechanism includes four guide grooves formed on the circumferential side of the rotating shaft. The four guide grooves are arranged in a circular array with the center of the rotating shaft as the center. The left end of the guide groove is straight and the right end is threaded. The circumferential side of the sleeve is provided with four threaded holes in a circular array. The threaded holes are threaded with guide bolts. One end of the guide thread passes through the threaded hole and is inserted into the guide groove.

[0009] Furthermore, the end of the guide bolt located inside the threaded hole is hemispherical.

[0010] Furthermore, the left end of the inner side of the sleeve is provided with an internal thread, and the outer side of the shaft is provided with an external thread that mates with the internal thread.

[0011] Compared with the prior art, the present invention has the following beneficial effects: (1) By setting a gasket between the shaft and the sleeve, the present invention effectively compensates for and reduces the installation gap between the shaft and the sleeve, so that the shaft will not deform significantly due to local compression when subjected to force, thereby keeping the shaft and the sleeve axis coaxial, avoiding jamming or early failure caused by axis offset, and significantly improving the reliability and service life of the outrigger rotation mechanism. (2) By setting the outer end of the sleeve as an annular protrusion and cooperating with the magnetic pad on the sleeve side, and using the limiting groove and limiting block to cooperate, the present invention provides a reliable axial positioning and anti-disengagement structure for the sleeve during installation and operation, which facilitates assembly and can keep the sleeve position stable under the vibration environment of equipment operation, thereby improving the stability and safety of the overall structure. Attached Figure Description

[0012] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is an exploded view of the present invention; Figure 4 This is a front view of the present invention; Figure 5 This is a perspective view of the sleeve of the present invention; Figure 6 This is an exploded view of Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 8 This is a schematic diagram of the structure of Embodiment 4 of the present invention; Figure 9 This is a structural schematic diagram of Embodiment 5 of the present invention.

[0013] In the diagram: 1. Shaft; 101. External thread; 102. Guide groove; 2. Sleeve; 201. Limiting block; 202. Threaded hole; 203. Internal thread; 3. Washer; 301. Limiting groove; 302. Annular protrusion; 4. Magnetic pad; 5. Guide bolt. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0015] like Figures 1 to 5 As shown, a leg rotation mechanism includes a rotating shaft 1 and a sleeve 2. The rotating shaft 1 is inserted into the sleeve 2, and the rotating shaft 1 and the sleeve 2 are arranged on the same axis. A rotation guide mechanism is provided inside the rotating shaft 1 and the sleeve 2. A pad 3 is inserted at the right end of the sleeve 2 between the sleeve 2 and the rotating shaft 1. The inner and outer sides of the pad 3 are in contact with the outer side of the rotating shaft 1 and the inner side of the sleeve 2, respectively. A limiting mechanism is provided between the pad 3 and the sleeve 2 to prevent the pad 3 from disengaging from the sleeve 2.

[0016] In this embodiment, the limiting mechanism includes four limiting blocks 201 disposed on the inner side of the sleeve 2. The four limiting blocks 201 are arranged in a ring around the axis of the sleeve 2. The outer side of the pad 3 is provided with four limiting grooves 301 arranged in a ring array. The four limiting blocks 201 are respectively inserted into the four limiting grooves 301. The limiting grooves 301 are connected to the left side of the pad 3. The right end of the limiting groove 301 is straight and the left end is threaded.

[0017] In this embodiment, an annular protrusion 302 is provided on the right end of the outer side of the sleeve 3, and the annular protrusion 302 contacts the right side of the sleeve 2.

[0018] In this embodiment, a magnetic pad 4 is provided on the right side of the sleeve 2, and the annular protrusion 302 is made of soft magnetic low carbon steel.

[0019] In this embodiment, the rotary guide mechanism includes four guide grooves 102 formed on the circumferential side of the rotating shaft 1. The four guide grooves 102 are arranged in a circular array with the center of the rotating shaft 1 as the center. The left end of the guide groove 102 is straight and the right end is threaded. The circumferential side of the sleeve 2 is provided with four threaded holes 202 in a circular array. The threaded holes 202 are connected to guide bolts 5 by internal threads 203. One end of the guide thread passes through the threaded hole 202 and is inserted into the guide groove 102.

[0020] In this embodiment, the end of the guide bolt 5 located inside the threaded hole 202 is hemispherical.

[0021] In this embodiment, the left end of the inner side of the sleeve 2 is provided with an internal thread 203, and the outer side of the rotating shaft 1 is provided with an external thread 101 that cooperates with the internal thread 203.

[0022] When using the above embodiments, The operator rotates and connects the left end of the rotating shaft 1 to the output end of the hydraulic push rod. Then, the operator inserts the right end of the rotating shaft 1 into the sleeve 2 and aligns the four guide grooves 102 on the rotating shaft 1 with the threaded holes 202. After the insertion is completed, the operator inserts the guide thread into the threaded holes 202 and inserts the end of the guide bolt 5 into the guide groove 102. Then, the operator attaches the magnetic pad 4 to the right side of the sleeve 2 and inserts the pad 3 from the right end of the rotating shaft 1 into the right end of the sleeve 2. Finally, the operator connects and fixes the right end of the rotating shaft 1 to the box support leg. When inserting the pad 3, the operator aligns the four limiting blocks 201 with the four limiting grooves 301 respectively. Then, the operator rotates and pushes the pad 3 into the sleeve 2. When the limiting block 201 is located in the straight part of the limiting groove 301, the operator can directly push the pad 3 into the sleeve 2. During use, when there is no external force pulling the pad 3, the limiting block 201 of the pad 3 will be locked in the threaded part of the limiting groove 301, thus preventing the pad 3 from detaching from the sleeve 2 and ensuring the reliability of the pad 3 during use. During use, the operator controls the hydraulic push rod to push the rotating shaft 1 into the sleeve 2. When the guide bolt 5 is in the straight part of the guide groove 102, the rotating shaft 1 cannot rotate during movement. When the guide shaft bolt is in the threaded part of the guide groove 102, the rotating shaft 1 rotates during horizontal movement due to the guidance of the limit bolt, thereby realizing the adjustment of the outrigger angle. At the same time, during rotation, the rotating shaft 1 can be threaded into the sleeve 2, further improving the reliability and stability of the connection between the rotating shaft 1 and the sleeve 2. The operator can adjust the rotation angle of the rotating shaft 1 by adjusting the stroke of the hydraulic push rod, which enables the operator to flexibly control the angle of the body outriggers and further improves the flexibility of the device.

[0023] In the above embodiment, the magnetic pad 4 can attract the pad 3, further ensuring the stability of the pad 3 inside the sleeve 2. Preferably, when not in use, the operator can rotate the guide bolt 5 to make the guide bolt 5 come into close contact with the guide groove 102, thereby preventing the rotating shaft 1 from rotating under the action of friction. Preferably, when maintenance is required, the operator can disconnect the shaft 1 from the hydraulic push rod and rotate the shaft 1 out from the right end of the sleeve 2, which improves the convenience of the operator during maintenance.

[0024] Example 2 differs from Example 1 in that: like Figure 6 As shown, in this embodiment, when the pad surface is not provided with a limiting groove, the pad surface is smooth, and at this time, no limiting block is provided on the inner side of the sleeve. In this embodiment, the limiting groove and limiting block are eliminated, and the surface of the pad is made smooth, which improves the convenience for workers to disassemble and install the pad, and enables workers to quickly replace the pad.

[0025] Example 3 differs from Example 1 in that: like Figure 7 As shown, in this embodiment, when the end of the sleeve is not provided with an annular protrusion, the side of the sleeve is not provided with a magnetic pad, which simplifies the structure of the device, reduces the cost of the device, and thus improves the economic efficiency of the device.

[0026] Example 4 differs from Example 1 in that: like Figure 8 As shown, in this embodiment, when the end of the sleeve is not provided with an annular protrusion and the surface of the sleeve is smooth and does not have a limiting groove, the limiting block on the inner side of the sleeve is located further inside the sleeve. When the pad is inserted into the sleeve, the end of the pad inside the sleeve contacts the limiting block, thereby limiting the limiting block and preventing it from being inserted too deeply into the sleeve and unable to be removed. Since the guide groove is a through groove, when the operator pulls the shaft out of the sleeve, the limiting block is located in the guide groove, and the operator can rotate to pull out the sleeve.

[0027] Example 5 differs from Example 1 in that: like Figure 9 As shown in this embodiment, when the surface of the pad is smooth and no limiting groove is provided, and the limiting block is located inside the sleeve, the limiting block and the annular protrusion can form a double limiting on the pad, further preventing the pad from going too deep into the sleeve and affecting the replacement of the pad, thus ensuring the convenience and reliability of the staff when replacing the pad.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A leg rotation mechanism, comprising a rotating shaft (1) and a sleeve (2), wherein the rotating shaft (1) is inserted into the sleeve (2), and the rotating shaft (1) and the sleeve (2) are coaxially arranged, characterized in that: A rotating guide mechanism is provided inside the rotating shaft (1) and the sleeve (2). A pad (3) is inserted at the right end of the sleeve (2) between the sleeve (2) and the rotating shaft (1). The inner and outer sides of the pad (3) are in contact with the outer side of the rotating shaft (1) and the inner side of the sleeve (2), respectively. A limiting mechanism is provided between the pad (3) and the sleeve (2) to prevent the pad (3) from detaching from the sleeve (2).

2. The outrigger rotation mechanism according to claim 1, characterized in that: The limiting mechanism includes four limiting blocks (201) disposed on the inner side of the sleeve (2). The four limiting blocks (201) are arranged in a ring around the axis of the sleeve (2). The outer side of the pad (3) is provided with four limiting grooves (301) in a ring array. The four limiting blocks (201) are respectively inserted into the four limiting grooves (301). The limiting grooves (301) are connected to the left side of the pad (3). The right end of the limiting groove (301) is straight and the left end is threaded.

3. The outrigger rotation mechanism according to claim 1, characterized in that: An annular protrusion (302) is provided on the right end of the outer side of the sleeve (3), and the annular protrusion (302) contacts the right side of the sleeve (2).

4. The outrigger rotation mechanism according to claim 3, characterized in that: A magnetic pad (4) is provided on the right side of the sleeve (2), and the annular protrusion (302) is made of soft magnetic low carbon steel.

5. The outrigger rotation mechanism according to claim 1, characterized in that: The rotary guide mechanism includes four guide grooves (102) opened on the circumferential side of the rotating shaft (1). The four guide grooves (102) are arranged in a circular array with the center of the rotating shaft (1) as the center. The left end of the guide groove (102) is straight and the right end is threaded. The circumferential side of the sleeve (2) is provided with four threaded holes (202) in a circular array. The threaded holes (202) are connected to guide bolts (5) by internal threads (203). One end of the guide thread passes through the threaded hole (202) and is inserted into the guide groove (102).

6. The outrigger rotation mechanism according to claim 5, characterized in that: The guide bolt (5) is hemispherical at one end inside the threaded hole (202).

7. The leg rotation mechanism according to claim 1, characterized in that: The sleeve (2) has an internal thread (203) on the left end of its inner side, and the shaft (1) has an external thread (101) on its outer side that cooperates with the internal thread (203).

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