Novel variable cross-section rotary table structure and crane thereof
By optimizing the cross-sectional design of channel steel by variable-section rotary table structure, the problem of stress concentration and weight increase in the high stress zone is solved, and the effect of improving load-bearing capacity and stiffness under the same weight is achieved, achieving the goal of lightweight and performance improvement.
Patent Information
- Application Number
- CN202422298002.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The existing rotary tower channel steel structure has limitations in improving load bearing capacity and controlling weight, especially in the high-stress area, the problem of stress concentration and weight increase is not significant, which is difficult to meet the needs of crane performance improvement.
The variable-section rotary table structure is adopted. By changing the cross-sectional area in the length direction of the channel steel, the cross-section of the high-stress area is increased and the cross-section of the low-stress area is reduced. Combined with the design of the reinforcement ribs, the stress distribution and structural stiffness are optimized.
Improve the overall performance of the turntable under limited space or weight targets, improve load-bearing capacity and stiffness, achieve lightweight, reduce stress concentration, improve reliability and torsional stiffness.
Smart Images
Figure CN223073817U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of construction machinery cranes, and particularly relates to a novel variable cross-section turntable structure and a crane thereof. Background Technique
[0002] Off-road tire cranes are often used for fixed yard operations. Their structures are compact, making it difficult to have an overly large outer frame size of the turntable. In addition, components such as the boom and winch need to be arranged on the turntable, which also makes it difficult to have an overly small inner frame of the turntable. For the above reasons, there are certain limitations to the overall outer frame size of the turntable. To meet the development trend of high-performance products, the load-bearing capacity of the turntable is often increased by increasing the plate thickness. On the basis of a considerable plate thickness, increasing the plate thickness increases the weight, but the increase in the load-bearing capacity is not significant. At the same time, the axle load also has certain limitations on the weight, and the increase in weight is also limited. Therefore, in the case where the performance of the crane is continuously improved while the overall weight of the product needs to be strictly limited, it is necessary to propose a novel turntable structure.
[0003] The existing turntable channel steel structure has a rear hinge point of the turntable on it, and it turns down to the large bottom plate of the turntable to transfer the boom reaction force to the slewing bearing. The channel steel material is distributed with an equal cross-section in the length direction. The rear hinge point is subjected to relatively concentrated forces, resulting in a relatively high stress level, a relatively large strain, and a relatively large deformation per unit length in the rear hinge point area, which may cause a relatively obvious change in the displacement of the boom suspension point.
[0004] There are two ways to improve the overall performance of the existing turntable channel steel structure: one is to increase the plate thickness without changing the outer profile size of the channel steel. However, on the basis of a considerable plate thickness, increasing the plate thickness increases the weight, but the increase in the load-bearing capacity is not significant. The other is to increase the overall outer profile size of the channel steel. Increasing the outer profile size of the channel steel will increase the overall outer frame size of the turntable and compress the layout space of the whole machine. The cross-section size cannot be increased infinitely due to the layout limitations of relevant components. Moreover, increasing the overall outer profile size of the channel steel will increase the overall weight in the length direction of the channel steel, resulting in weight redundancy in the low-stress areas where not much material distribution is required, increasing the design cost and the overall weight of the machine. The currently relatively advanced double obtuse angle C-shaped cross-section channel steel structure has a certain improvement in its overall performance. However, with the development trend of continuously improving performance while strictly controlling the overall weight, the double obtuse angle C-shaped cross-section channel steel structure gradually fails to meet the usage requirements, and a novel cross-section structure is needed to achieve the goal of lightweight while improving the load-bearing capacity. Content of the Utility Model
[0005] In view of the deficiencies of the prior art, the present utility model provides a novel variable cross-section turntable structure and a crane thereof, which can further improve the overall performance (strength, stiffness, etc.) of the turntable within a limited space or under a weight target, thereby improving the load-bearing capacity of the turntable; or on the basis of the same load-bearing capacity, increasing the cross-section of the high-stress area and reducing the plate thickness or the cross-section of the low-stress area can further achieve structural lightweighting.
[0006] The technical solution provided by the present utility model is as follows:
[0007] The present utility model provides a novel variable cross-section turntable structure, including a front section of the turntable and a rear section of the turntable. The rear section of the turntable is docked with the front section of the turntable. The front section of the turntable includes a bottom plate, a vertical plate, and an internal box-shaped structure. The vertical plates are symmetrically arranged vertically at both ends of the bottom plate. The internal box-shaped structure is arranged along the horizontal direction of the inner side of the vertical plate and the lower end is connected to the bottom plate. A strengthening component is provided on the outer side of the vertical plate. The strengthening component bears the rear hinge point of the turntable. The strengthening component is composed of a first channel steel, a second channel steel, a third channel steel, and a fourth channel steel. The first channel steel and the second channel steel are respectively fixedly distributed along the upper edge and the lower edge of the vertical plate. The third channel steel and the fourth channel steel respectively fit the cross-sections on both sides of the second channel steel. The cross-sectional area of at least one of the first channel steel, the second channel steel, the third channel steel, and the fourth channel steel changes along the length direction.
[0008] Further, when the cross-sectional area of at least one of the first channel steel, the second channel steel, the third channel steel, and the fourth channel steel changes along the length direction, the change direction is that the height gradually increases or the width gradually increases or a combination of both along the length direction.
[0009] Further, when the change direction is that the height gradually increases along the length direction, the upper end surface and the lower end surface of the strengthening component are trapezoidal.
[0010] Further, the side cross-section of the second channel steel fits with the side cross-sections of the third channel steel and the fourth channel steel to form an inflection point. The inflection point forms a right angle or a right angle and an obtuse angle or both obtuse angles with the two side planes.
[0011] Further, a vertical strengthening rib is also provided between the first channel steel and the second channel steel. The cross-sectional area of the strengthening rib changes along the length direction.
[0012] Further, when the cross-sectional area of the strengthening rib changes along the length direction, the change direction is that the height gradually increases or the width gradually increases or a combination of both along the length direction.
[0013] Further, the first channel steel, the second channel steel, the third channel steel, and the fourth channel steel are welded and fixed to the vertical plate.
[0014] The present utility model also provides a crane, including the novel variable cross-section turntable structure described in any one of the above.
[0015] Beneficial effects
[0016] (1) By changing the cross-sectional structure of the channel steel, the present utility model increases the cross-section in the high-stress area and decreases the cross-section in the low-stress area, thereby enhancing the torsional and bending resistance, and further making the torsional stiffness and the longitudinal stiffness in the luffing plane more balanced.
[0017] (2) The present utility model can increase the cross-sectional area within a limited weight range, improve the mechanical properties of the structure, and further enhance the load-bearing capacity of the turntable. At the same time, its stress form is better, stress concentration is reduced, and reliability is improved.
[0018] (3) On the basis of the same load-bearing capacity, the present utility model can achieve further lightweight. Under the same performance, the weight of the channel steel is reduced by 3% - 5%; under the same weight, the torsional stiffness is increased by more than 2 - 5%, and the overall stiffness of the turntable is increased by 4 - 10%. Description of the drawings
[0019] Figure 1 is the overall structural schematic diagram of the novel variable cross-section turntable structure of the present utility model.
[0020] Figure 2 is the schematic diagram of the two-way variable cross-section structure of the present utility model.
[0021] Figure 3 is the cross-section comparison schematic diagram of the strengthening component of the present utility model (the black-filled area is the increased cross-section, and the hatched area is the reduced cross-section).
[0022] Figure 4 is the schematic diagram of the layout form of the strengthening component of the present utility model.
[0023] Figure 5 is the top view of the strengthening component of the present utility model.
[0024] Figure 6 is the performance change effect diagram of the present utility model calculated by finite element simulation under the same weight (the left figure is the original turntable structure; the right figure is the novel variable cross-section turntable structure).
[0025] Figure 7 is the weight change effect diagram of the present utility model calculated by finite element simulation under the same bearing capacity (the left figure is the original turntable structure; the right figure is the novel variable cross-section turntable structure).
[0026] Description of the reference numerals: 1. Front section of the turntable; 2. Rear section of the turntable; 3. Base plate; 4. Vertical plate; 5. Internal box structure; 6. First channel steel; 7. Second channel steel; 8. Third channel steel; 9. Fourth channel steel; 10. Rear hinge point. Detailed implementation manners
[0027] The present utility model will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present utility model, and cannot be used to limit the protection scope of the present utility model.
[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.
[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.
[0030] Embodiment 1
[0031] An embodiment of the present utility model provides a novel variable cross-section turntable structure, which includes a hinged front turntable section 1 and a rear turntable section 2. The front turntable section 1 includes a bottom plate 3, a vertical plate 4, and an internal box-shaped structure 5. The vertical plates 4 are symmetrically arranged vertically at both ends of the bottom plate 3. The internal box-shaped structure 5 is arranged along the horizontal direction of the inner side surface of the vertical plate 4 and the lower end is connected to the bottom plate 3. A reinforcing component is provided on the outer side surface of the vertical plate 4. The reinforcing component bears the rear hinge point 10 of the front turntable section and the rear turntable section. The reinforcing component is composed of a first channel steel 6, a second channel steel 7, a third channel steel 8, and a fourth channel steel 9. The first channel steel 6 and the second channel steel 7 are respectively fixedly distributed along the upper and lower edges of the vertical plate 4 and one end bears the rear hinge point 10 of the front turntable section 1 and the rear turntable section 2. The third channel steel 8 and the fourth channel steel 9 respectively fit the two side cross-sections of the second channel steel 7. The cross-sectional area of at least one of the first channel steel 6, the second channel steel 7, the third channel steel 8, and the fourth channel steel 9 changes along the length direction.
[0032] Specifically, this embodiment proposes a novel variable cross-section turntable structure formed by hinging the front section 1 of the turntable and the rear section 2 of the turntable. The front section 1 of the turntable includes a bottom plate 3, a vertical plate 4, and an internal box-shaped structure 5 to enhance the stability of the overall structure. By arranging a strengthening component composed of the first channel steel 6 to the fourth channel steel 9 on the outer side of the vertical plate 4, and the cross-sectional areas of these channel steels can vary along the length direction, flexible adjustment of the strength and rigidity of the turntable structure is achieved.
[0033] Embodiment 2
[0034] As Figure 1 shown, an embodiment of the present utility model provides a novel variable cross-section turntable structure. This turntable structure is formed by docking the front section 1 of the turntable and the rear section 2 of the turntable. The structural form of the front section 1 of the turntable is in the form of a vertical plate 3 + an internal box-shaped structure 5 + an external strengthening component, realizing the lightweight design of the turntable structure. The strengthening component consists of the first channel steel 6, the second channel steel 7, the third channel steel 8, and the fourth channel steel 9. The first channel steel 6 and the second channel steel 7 are respectively fixedly distributed along the upper edge and the lower edge of the vertical plate. The third channel steel 8 and the fourth channel steel 9 respectively fit the two side cross-sections of the second channel steel 7. The cross-sectional area of at least one of the first channel steel 6, the second channel steel 7, the third channel steel 8, and the fourth channel steel 9 varies along the length direction.
[0035] As Figures 2-3 shown, in this embodiment, when the cross-sectional area of at least one of the first channel steel 6, the second channel steel 7, the third channel steel 8, and the fourth channel steel 9 varies along the length direction, the variation direction is that the height gradually increases or the width gradually increases or a combination of both along the length direction.
[0036] Specifically, the rear hinge point 10 of the turntable is carried on the channel steel and turns down to the bottom plate 3 of the turntable, transmitting the boom reaction force to the slewing bearing. When the channel steel is equally distributed in cross-section along the length direction, the forces on the rear side of the root of the rear hinge point 10 and the bottom plate 3 are relatively concentrated, resulting in a relatively high stress level, a corresponding large strain, and a large deformation per unit length in the area of the root of the rear hinge point 3 and the bottom plate 10. Therefore, the load-bearing capacity of the cross-sectional arrangement of the channel steel is poor, the stress level is large, and the contribution to the overall stiffness of the rear hinge point 10 area is limited. The present utility model arranges the cross-section of the channel steel as a variable cross-section structure along the length, that is, increasing the cross-section in the width direction or the height direction or both the width direction and the height direction simultaneously, so that the cross-section of the high-stress area increases correspondingly, the cross-section of the low-stress area decreases appropriately, and the load transfer is smooth, improving the overall stress level.
[0037] In this embodiment, when the variation direction is that the height gradually increases along the length direction, the upper and lower end faces of the strengthening component are trapezoidal ( Figure 2 ).
[0038] As Figures 4-5As shown, in this embodiment, the side cross-section of the second channel steel 7 fits with the side cross-sections of the third channel steel 8 and the fourth channel steel 9 to form an inflection point, and the angles between the inflection point and the two side planes are all right angles, or a right angle and an obtuse angle, or all obtuse angles.
[0039] In this embodiment, a vertical reinforcing rib is further provided between the first channel steel 6 and the second channel steel 7, and the cross-sectional area of the reinforcing rib changes along the length direction.
[0040] In this embodiment, when the cross-sectional area of the reinforcing rib changes along the length direction, the change direction is that the height gradually increases or the width gradually increases along the length direction, or a combination of both.
[0041] In this embodiment, the first channel steel 6, the second channel steel 7, the third channel steel 8, and the fourth channel steel 9 are welded and fixed to the vertical plate 4.
[0042] Specifically, there are the following two situations for the novel variable cross-section turntable structure of the present utility model. The first is that under the condition of the same weight, the cross-section of the high-stress end of the channel steel is increased, and the cross-section of the low-stress end is synchronously reduced ( Figure 3 ), to improve the stress level at the high-stress end, enhance the torsional stiffness in the area of the rear hinge point and the longitudinal stiffness in the luffing plane, and reduce the displacement and bearing capacity of the lifting point of the boom. The second is that under the condition of the same bearing capacity, the cross-section of the low-stress end is reduced, the thickness of the channel steel or other plates is reduced, and the cross-section of the high-stress end of the channel steel is synchronously increased. Because compared with the plate thickness, the cross-sectional size has a more significant impact on the performance with the same weight, it is possible to reduce the weight of the channel steel under the condition of the same bearing capacity and achieve the light weight of the turntable structure.
[0043] In order to verify the performance of the novel variable cross-section turntable structure of the present utility model under the condition of the same weight, it is compared with the turntable structure without cross-section change, and the results are shown in Table 1.
[0044] Table 1 Deformation data of the turntable structure under the same weight
[0045]
[0046] From Figure 6 and Table 1, it can be seen that for the present utility model under the condition of the same weight, the torsional stiffness is increased by 2.742%, and the overall stiffness of the turntable is increased by 4.85%.
[0047] In order to verify the performance of the novel variable cross-section turntable structure of the present utility model under the condition of the same bearing capacity, it is compared with the turntable structure without cross-section change, and the results are shown in Table 2.
[0048] Table 2 Weight data of the turntable structure under the same bearing capacity
[0049]
[0050] FromFigure 7 As can be seen from Table 2, the utility model can achieve further light weight on the basis of the same load-bearing capacity. Under the same load-bearing capacity, the weight of the channel steel is reduced by 3.57%.
[0051] Embodiment 3
[0052] The embodiment of the utility model also provides a crane, which includes the novel variable cross-section turntable structure described in Embodiment 1 or 2.
[0053] The above are only the preferred embodiments of the utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the utility model, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the utility model.
Claims
1. A novel variable cross-section turntable structure, characterized in that, It includes a hinged front turntable section and a rear turntable section. The front turntable section includes a bottom plate, vertical plates, and an internal box structure. The vertical plates are symmetrically arranged vertically at both ends of the bottom plate. The internal box structure is arranged horizontally along the inner side of the vertical plates and is connected to the bottom plate at the lower end. A strengthening component is provided on the outer side of the vertical plates. The strengthening component bears the rear hinge point of the turntable. The strengthening component includes a first channel steel, a second channel steel, a third channel steel, and a fourth channel steel. The first channel steel and the second channel steel are respectively fixedly distributed along the upper and lower edges of the vertical plate. The third channel steel and the fourth channel steel respectively fit the two side sections of the second channel steel. The cross-sectional area of at least one of the first channel steel, the second channel steel, the third channel steel, and the fourth channel steel changes along the length direction.
2. The novel variable cross-section turntable structure according to claim 1, wherein, When the cross-sectional area of at least one of the first channel steel, the second channel steel, the third channel steel, and the fourth channel steel changes along the length direction, the change direction is that the height gradually increases or the width gradually increases or a combination of both along the length direction.
3. The novel variable cross-section turntable structure according to claim 2, wherein, When the change direction is that the height gradually increases along the length direction, the upper and lower end faces of the strengthening component are trapezoidal.
4. The novel variable cross-section turntable structure according to claim 1, characterized in that, The side section of the second channel steel fits with the side sections of the third channel steel and the fourth channel steel to form an inflection point. The angles between the inflection point and the two plane sides are all right angles or a right angle and an obtuse angle or all obtuse angles.
5. The novel variable cross-section turntable structure according to claim 1, characterized in that, A vertical reinforcing rib is also provided between the first channel steel and the second channel steel. The cross-sectional area of the reinforcing rib changes along the length direction.
6. The novel variable cross-section turntable structure according to claim 5, characterized in that, When the cross-sectional area of the reinforcing rib changes along the length direction, the change direction is that the height gradually increases or the width gradually increases or a combination of both along the length direction.
7. The novel variable cross-section turntable structure according to claim 1, characterized in that, The first channel steel, the second channel steel, the third channel steel, and the fourth channel steel are welded and fixed on the vertical plate.
8. A crane, characterized in that, It includes the novel variable cross-section turntable structure according to any one of claims 1-7.