A turntable mounting structure and a crane

Abstract

The utility model discloses a rotary table mounting structure, including amplitude variation subassembly and the symmetrical setting of rotary table both sides rotary table support group, half axle group and end fixed group, the rotary table support group includes single vertical board subassembly and ladder type axle sleeve, single vertical board subassembly's lower end connects rotary table big sole plate subassembly, and the upper end connects rotary table rear section, ladder type axle sleeve penetrates single vertical board subassembly, amplitude variation subassembly is arranged in the rotary table support group of both sides middle, one end of half axle group embeddedly connects amplitude variation subassembly and forms cylindrical pair, and the other end is connected with ladder type axle sleeve and forms cylindrical pair, end fixed group includes baffle group and connecting group, baffle group penetrates ladder type axle sleeve and is embeddedly installed in half axle group, and connecting group passes through baffle group and is connected in ladder type axle sleeve. The utility model can further compress the installation interface use space, and improve amplitude variation subassembly arrangement space under satisfying the same amplitude variation demand (amplitude angle, stroke) of amplitude variation subassembly.

Description

Technical Field

[0001] This utility model relates to a turntable mounting structure and a crane, belonging to the field of engineering machinery technology. Background Technology

[0002] Industrial cranes are often used in confined spaces, and their compact structure results in a small turntable frame. Furthermore, the turntable needs to accommodate the boom, luffing cylinders, and other components, further limiting the internal space. Unlike conventional cranes, industrial cranes place the operator's cab on the chassis, requiring further compression of the turntable and luffing cylinder hinge points to achieve 360° rotation. For these reasons, the overall size of the turntable frame and the internal space are significantly restricted. Therefore, given the continuous improvement in crane performance and the need for strict space constraints in product layout, the development of a new turntable installation structure is necessary.

[0003] Existing technologies employ a structure consisting of double-support turntable, through-shaft, and end-fixed assembly. However, this approach has the following drawbacks: (1) The luffing assembly requires an additional through-type installation interface at its end, necessitating a large overall layout space. For compact industrial crane turntable structures with stringent space requirements, the luffing assembly and corresponding turntable installation structure occupying additional space at the end cannot meet the layout requirements. (2) Only a mounting plate is provided on one side of the turntable, and the mounting plate is only connected to the rear section of the turntable, resulting in more concentrated stress and relatively poor load-bearing capacity. (3) The turntable end is fixed only by fasteners, which are more prone to damage in complex bending, torsion, and pressure installation environments with relatively heavy loads. The safety and reliability of the connection need to be further improved. Therefore, with the trend of strict control over the overall layout space and gradual improvement in performance, the existing double-support turntable, through-shaft, and end-fixed assembly installation structure can no longer meet the usage requirements. A new type of turntable installation structure is needed to meet the layout requirements of a safer, more reliable, and compact connection. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a turntable installation structure and crane, which compresses the space used for the installation interface, increases the space for the extension and retraction direction of the luffing components, and solves the problem of limited space arrangement for cranes operating in confined spaces.

[0005] To achieve the above objectives, this utility model employs the following technical solution: In the first aspect, this utility model provides a turntable mounting structure, including an amplitude-changing component, and a turntable support group, a half-shaft group and an end fixing group symmetrically arranged on both sides of the turntable; The turntable support assembly includes a single upright plate assembly and a stepped bushing. The lower end of the single upright plate assembly is connected to the turntable base plate assembly, and the upper end is connected to the rear section of the turntable. The stepped bushing passes through the single upright plate assembly. The amplitude-changing component is arranged in the middle of the turntable support groups on both sides. One end of the half-shaft group is embedded and connected to the amplitude-changing component to form a cylindrical pair, and the other end is connected to the stepped bushing to form a cylindrical pair. The end fixing assembly includes a baffle assembly and a connecting assembly. The baffle assembly passes through the stepped bushing and is embedded in the half shaft assembly. The connecting assembly passes through the baffle assembly and is connected to the stepped bushing.

[0006] Furthermore, the single-panel assembly includes a single-panel group and a stiffening plate group, and the combination of the stiffening plate group and the single-panel group can be a transverse paneling form or a longitudinal thin-thickness butt joint form.

[0007] Furthermore, in the aforementioned transverse plate configuration, the stiffening plate assembly is attached to the outer side of the single upright plate assembly. The stiffening plate assembly and the single upright plate assembly are respectively provided with a first connecting hole for installing a stepped bushing, used to connect the small end of the stepped structure of the stepped bushing. The stiffening plate assembly adopts a through-type arrangement, that is, the lower end of the stiffening plate assembly connects to the turntable base plate assembly, and the upper end of the stiffening plate assembly connects to the rear section of the turntable. This through-type stiffening plate arrangement ensures even load distribution, better stress distribution, reduced stress concentration, and improved reliability.

[0008] Furthermore, in the longitudinal thin-thickness butt joint configuration, the single upright plate assembly is welded to the stiffening plate assembly, the thickness of the stiffening plate assembly is greater than the thickness of the single upright plate assembly, and the stiffening plate assembly is provided with a first connecting hole for installing a stepped bushing, for connecting the small end of the stepped structure of the stepped bushing; the stiffening plate assembly can be a vertically continuous type, that is, the lower end of the stiffening plate assembly is connected to the turntable base plate assembly, and the upper end of the stiffening plate assembly is connected to the rear section of the turntable, or it can be a single-sided bearing type, that is, only the lower end of the stiffening plate assembly is connected to the turntable base plate assembly, or only the upper end of the stiffening plate assembly is connected to the rear section of the turntable.

[0009] Furthermore, the stepped bushing is a cylindrical stepped structure, including a large end and a small end of the stepped structure. The large end of the stepped structure is located inside the single-panel assembly, and the small end of the stepped structure passes through the mounting hole in the single-panel assembly and is connected to the end fixing group.

[0010] Furthermore, one side of the larger end of the stepped structure is a mating surface that abuts against the end face of the amplitude transformer component; the other side is a connecting surface that is fixedly connected to the single-plate component.

[0011] Furthermore, the small end of the stepped structure has a first slot for mounting the baffle assembly radially and a second connecting hole for mounting the connecting assembly axially, the second connecting hole penetrating both sides of the first slot; the half-shaft assembly has a second slot, the position and direction of which correspond to the first slot. Specifically, one side of the second connecting hole can be a threaded hole and the other side a smooth hole, one end of the connecting assembly is threaded, which passes through the smooth hole in the second connecting hole and the third connecting hole in the baffle assembly, and is connected to the threaded hole in the second connecting hole through a threaded pair.

[0012] Furthermore, the second slot is a blind hole or a through hole, and the corresponding first slot is a radial through hole or a diameter through hole.

[0013] Furthermore, the baffle assembly and the first slot are provided with a first fitting clearance in both the axial and circumferential directions, the baffle assembly and the second slot are provided with a second fitting clearance in both the axial and circumferential directions, and the baffle assembly and the connecting assembly are provided with a third fitting clearance.

[0014] Furthermore, both the third and second fitting gaps are larger than the first fitting gap.

[0015] Furthermore, the luffing assembly is a luffing cylinder, including a cylinder assembly and a rod assembly forming a sliding pair, with blind holes for connecting the half-shaft assembly respectively provided on both sides of the cylinder assembly.

[0016] Secondly, this utility model also provides a crane on which the turntable mounting structure described in the first aspect is installed.

[0017] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: This utility model provides a double-support half-shaft turntable installation structure, which, while meeting the same luffing requirements (luffing angle and stroke) of the luffing assembly, can further reduce the space used for the installation interface and increase the arrangement space of the luffing assembly. Its turntable support group adopts a single vertical plate assembly and a stepped bushing, which greatly improves the bending resistance of the local structure and the strength, stiffness and other performance of the luffing hinge point, a key load-bearing part of the turntable. At the same time, it adopts a through-type fixed + embedded adjustable installation end fixing form, and uses a large cross-section plate assembly to replace small cross-section fasteners, which further improves the safety and reliability of the turntable installation connection and the ease of assembly. In this utility model, the baffle assembly is fixed in a through-type manner, and the connection is safe and reliable; its embedded installation allows for adjustable gaps in both circumferential and circumferential directions, making installation convenient and quick. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a turntable mounting structure provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of one side of the turntable support assembly described in the embodiment; Figure 3 This is a schematic diagram of the stepped bushing structure described in the embodiment; Figure 4 This is a schematic diagram of the assembly structure of the end fixing assembly described in the embodiment; Figure 5 This is a schematic diagram of the fitting clearance of the end fixing assembly as described in the embodiment; Figure 6 This is a schematic diagram of the longitudinal thin-thickness butt joint support assembly described in the embodiment; Figure 7 This is a schematic diagram of the single-sided support stiffener plate group structure described in the embodiment.

[0019] In the diagram: 1. Rear section of the turntable; 2. Turntable support assembly; 21. Single upright plate assembly; 22. Rib plate assembly; 23. Stepped bushing; 231. Stepped large surface; 232. Stepped small surface; 233. First slot; 234. Smooth hole; 235. Threaded hole; 24. First connecting hole; 3. Luffing assembly; 4. Half shaft assembly; 41. Second slot; 5. End fixing assembly; 51. Baffle assembly; 511. Third connecting hole; 52. Connecting assembly; 53. First fitting clearance; 54. Second fitting clearance; 55. Third fitting clearance; 6. Large base plate assembly. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0021] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0022] For ease of understanding, the proper nouns appearing in this utility model are explained below: Industrial crane: A wheeled crane capable of using outriggers to support lifting operations or traveling on deck with a load.

[0023] Turntable: An important load-bearing component of the crane, on which the boom is connected and bears the load of the boom, including the heavy object. Its bottom is mounted on the crane chassis via a slewing bearing, which enables the crane boom to rotate 360° for lifting operations. Its tail is connected to a counterweight to generate an anti-overturning moment and prevent the crane from tipping over.

[0024] Through-shaft mounting structure: The shaft is supported by turntables at both ends.

[0025] Half-shaft mounting structure: a structure in which one end of the shaft is connected to a turntable support.

[0026] Example 1 like Figure 1 As shown, this embodiment provides a turntable mounting structure, including a variable amplitude component 3, and a turntable support group 2, a half shaft group 4, and an end fixing group 5 symmetrically arranged on both sides of the turntable.

[0027] like Figure 2 As shown, in this embodiment, the turntable support group 2 includes a single upright plate assembly and a stepped bushing 23. The lower end of the single upright plate assembly is connected to the turntable base plate assembly 6, and the upper end is connected to the turntable rear section 1. The stepped bushing 23 passes through the single upright plate assembly. The single-plate assembly includes a single-plate group 21 and a stiffener group 22 assembled in the form of horizontally attached plates. The stiffener group 22 is attached to the outside of the single-plate group 21. The stiffener group 22 and the single-plate group 21 are respectively provided with a first connecting hole 24 for installing a stepped bushing 23, which is used to connect the small end of the stepped structure of the stepped bushing 23. The stiffener group 22 adopts a vertical through-type, that is, the lower end of the stiffener group 22 is connected to the turntable base plate assembly 6, and the upper end of the stiffener group 22 is connected to the rear section 1 of the turntable, so as to evenly transfer the thrust and thrust torque borne to the root and tail of the turntable, avoid excessive concentration of high stress in the local area of ​​the turntable support group 2, and effectively improve the overall stress level of the half-shaft single-sided support structure.

[0028] like Figure 3 As shown, in this embodiment, the stepped bushing 23 is a cylindrical stepped structure with a connecting circular hole inside. It forms a cylindrical pair with the half-shaft assembly 4, realizing circumferential rotation and axial sliding. The stepped bushing 23 includes a large end and a small end of the stepped structure. The large end of the stepped structure is located inside the single upright plate assembly 21 (in this utility model, the area between the turntable support assemblies 2 on both sides is considered the inner side), and the small end of the stepped structure passes through the first connecting hole 24 and connects to the end fixing assembly 5. The side of the stepped structure away from the small end is the stepped large surface 231, which is a mating surface that abuts against the end face of the luffing component 3 to prevent axial movement of the end face of the luffing component 3. The side closer to the small end of the stepped structure is the stepped small surface 232, which is a connecting surface that is fixedly connected to the single upright plate assembly 21. This increases the connection strength between the stepped bushing 23 and the single upright plate assembly, improves the thrust torque load stress on the connecting surface between the stepped bushing 23 and the single upright plate assembly caused by the thrust of the luffing component 3, and enhances the bending resistance and connection reliability of the half-shaft single-sided support structure.

[0029] In this embodiment, as Figure 3As shown, the small end of the stepped structure is provided with a first slot 233, which is a radial through hole for installing the baffle group 51 of the end fixing group 5; at the same time, the small end of the stepped structure is also provided with a second connecting hole, which passes through both sides of the first slot 233, with a threaded hole 235 on the outer side and a smooth hole 234 on the inner side; at least one set of the second connecting holes is provided, which is axial and is used to install the connecting group 52 of the end fixing group 5.

[0030] In this embodiment, the luffing assembly 3 includes a luffing cylinder, which is arranged in the middle of the turntable support group 2 on both sides. It includes a cylinder group and a rod group, which form a sliding pair to realize reciprocating telescopic movement. Blind holes connecting the half shaft group 4 are respectively provided on both sides of the cylinder group. The blind holes and the half shaft group 4 form a cylindrical pair to realize limited axial sliding and circumferential reciprocating rotational motion.

[0031] In this embodiment, the half-shaft assembly 4 is symmetrically arranged on the left and right sides of the turntable. One end of the assembly is installed in the connecting round hole of the stepped bushing 23 and connected with the stepped bushing 23 to form a cylindrical pair, realizing axial sliding and axial rotation. The other end is embedded in the blind hole of the amplitude transformer assembly 3 and forms a cylindrical pair.

[0032] In this embodiment, as Figure 4 As shown, the half-shaft assembly 4 is provided with a second slot 41. The position and direction of the second slot 41 correspond to the first slot 233, and the second slot 41 is a blind hole with a depth not greater than the shaft radius.

[0033] like Figure 4 As shown, in this embodiment, the end fixing group 5 includes a baffle group 51 and a connecting group 52, both of which are symmetrically distributed and installed on both sides of the turntable.

[0034] like Figure 5 As shown, the baffle assembly 51 is installed through-hole in the first slot 233 of the stepped bushing 23, and a first fitting clearance 53 is provided axially and circumferentially between the baffle assembly 51 and the first slot 233, such as... Figure 5 As shown in (a), the baffle assembly 51 is installed without shaking and can be easily pulled out; the baffle assembly 51 is embedded in the second slot 41 of the half-shaft assembly 4. To facilitate the smooth insertion of the baffle assembly 51 into the second slot 41 after it is inserted through the first slot 233, a second fitting clearance 54 is provided axially and circumferentially between the baffle assembly 51 and the second slot 41. Figure 5 As shown in (b), the second fitting clearance 54 is greater than the first fitting clearance 53, which reduces assembly accuracy and improves assembly efficiency. To prevent the half-shaft assembly 4 from sliding out too much in the blind hole of the luffing assembly 3 and affecting the connection strength between the luffing assembly 3 and the half-shaft assembly 4, the axial second fitting clearance 54 between the baffle assembly 51 and the second slot 41 is a one-way clearance, that is, the axial clearance between the two is arranged on the side away from the luffing assembly 3.

[0035] The baffle assembly 51 is provided with a third connecting hole 511 for mounting the connecting assembly 52. ​​One end of the connecting assembly 52 is threaded, passing through the smooth hole 234 in the second connecting hole and the third connecting hole 511 in the baffle assembly 51, and is connected to the threaded hole 235 in the second connecting hole via a threaded pair. To prevent the connecting assembly 52 from bearing the circumferential shear and axial tensile and compressive forces transmitted by the amplitude transformer assembly 3 before the baffle assembly 51, a third fitting clearance 55 is provided between the third connecting hole 511 of the baffle assembly 51 and the connecting assembly 52, such as... Figure 5 As shown in (c), the third fitting clearance 55 is greater than the first fitting clearance 53, which effectively avoids repeated fatigue damage to the connecting group 52 and improves the safety and reliability of the turntable installation connection.

[0036] In this embodiment, the cross-section of the first slot 233 and the second slot 41 is rectangular. In some other embodiments, the cross-section may also be circular.

[0037] In some other embodiments, the second slot 41 can also be a through hole. In this case, the corresponding first slot 233 is changed from a radial through hole to a diameter through hole.

[0038] In some other embodiments, the single-plate assembly 21 and the stiffening plate assembly 22 can be combined in a longitudinal thin-thickness butt joint manner, such as... Figure 6 As shown, the single upright plate group 21 is welded to the stiffening plate group 22. The thickness of the stiffening plate group 22 is greater than the thickness of the single upright plate group 21. The stiffening plate group 22 is provided with a first connecting hole 24 for installing a stepped bushing 23, which is used to connect the small end of the stepped structure of the stepped bushing 23. In this structure, the stiffening plate group 22 adopts a through-type structure, that is, the lower end of the stiffening plate group 22 is connected to the turntable base plate assembly 6, and the upper end of the stiffening plate group 22 is connected to the rear section 1 of the turntable.

[0039] In other embodiments employing a longitudinal thin-thickness butt joint configuration, the stiffening plate assembly 22 can also be a single-sided connection type, i.e., only the lower end of the stiffening plate assembly 22 is connected to the turntable base plate assembly 6, or only the upper end of the stiffening plate assembly 22 is connected to the rear section 1 of the turntable. For example... Figure 7 As shown, only the upper end of the stiffener assembly 22 is connected to the rear section 1 of the turntable.

[0040] Example 2 This embodiment provides a crane on which the turntable mounting structure described in Embodiment 1 is installed.

[0041] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., 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.

[0042] 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.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A turntable mounting structure, characterized in that, It includes the luffing assembly, as well as the turntable support assembly, half-shaft assembly and end fixing assembly symmetrically arranged on both sides of the turntable; The turntable support assembly includes a single upright plate assembly and a stepped bushing. The lower end of the single upright plate assembly is connected to the turntable base plate assembly, and the upper end is connected to the rear section of the turntable. The stepped bushing passes through the single upright plate assembly. The amplitude-changing component is arranged in the middle of the turntable support groups on both sides. One end of the half-shaft group is embedded and connected to the amplitude-changing component to form a cylindrical pair, and the other end is connected to the stepped bushing to form a cylindrical pair. The end fixing assembly includes a baffle assembly and a connecting assembly. The baffle assembly passes through the stepped bushing and is embedded in the half shaft assembly. The connecting assembly passes through the baffle assembly and is connected to the stepped bushing.

2. The turntable mounting structure according to claim 1, characterized in that, The single-panel assembly includes a single-panel group and a stiffening plate group. The combination of the stiffening plate group and the single-panel group can be either a horizontal paneling form or a vertical thin-thickness butt joint form.

3. The turntable mounting structure according to claim 2, characterized in that, In the horizontal plate configuration, the stiffening plate group is attached to the outside of the single upright plate group. The stiffening plate group and the single upright plate group are respectively provided with a first connecting hole for installing a stepped bushing. The lower end of the stiffening plate group is connected to the turntable base plate assembly, and the upper end of the stiffening plate group is connected to the rear section of the turntable.

4. The turntable mounting structure according to claim 2, characterized in that, In the longitudinal thin-thickness butt joint configuration, the single upright plate group is welded to the stiffening plate group, the thickness of the stiffening plate group is greater than the thickness of the single upright plate group, the stiffening plate group is provided with a first connecting hole for installing a stepped bushing, the lower end of the stiffening plate group is connected to the turntable base plate assembly and / or the upper end of the stiffening plate group is connected to the rear section of the turntable.

5. The turntable mounting structure according to claim 1, characterized in that, The stepped bushing is a cylindrical stepped structure, including a large end and a small end. The large end is located inside the single-panel assembly, and the small end passes through the mounting hole in the single-panel assembly and is connected to the end fixing group.

6. The turntable mounting structure according to claim 5, characterized in that, One side of the stepped structure at the large end is a mating surface that abuts against the end face of the amplitude transformer component; the other side is a connecting surface that is fixedly connected to the single-plate component.

7. The turntable mounting structure according to claim 5, characterized in that, The stepped structure has a first slot for installing a baffle assembly along the radial direction at its small end, and a second connecting hole for installing a connecting assembly along the axial direction. The second connecting hole passes through both sides of the first slot. The half-shaft assembly has a second slot, and the position and direction of the second slot correspond to the first slot.

8. The turntable mounting structure according to claim 7, characterized in that, The baffle assembly and the first slot are provided with a first fitting clearance in both the axial and circumferential directions, the baffle assembly and the second slot are provided with a second fitting clearance in both the axial and circumferential directions, and the baffle assembly and the connecting assembly are provided with a third fitting clearance.

9. The turntable mounting structure according to claim 8, characterized in that, The third and second fitting gaps are both larger than the first fitting gap.

10. A crane, characterized in that, The crane is equipped with a turntable mounting structure as described in any one of claims 1 to 9.

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