Chassis structure for automobile crane and automobile crane

Abstract

The utility model relates to the field of engineering machinery, and discloses a chassis structure for an automobile crane and the automobile crane, the chassis structure comprises a box-type frame, a tail supporting leg box body and a slewing bearing mounting seat, the box-type frame extends in the front-back direction, and the cross section of the box-type frame is in an inverted trapezoidal shape; the tail supporting leg box body is arranged at the tail part of the box type frame and is used for installing the tail supporting leg mechanism, the outer end of the tail supporting leg box body is provided with a box body opening for the tail supporting leg mechanism to extend out, and the slewing bearing mounting seat is arranged between the middle part and the tail part of the box type frame. According to the chassis structure for the automobile crane and the automobile crane, the lateral hoisting performance and the tail hoisting performance of the crane can be improved, and therefore the hoisting operation efficiency is improved.

Description

Chassis structure for truck cranes and truck cranes Technical Field

[0001] This application belongs to the field of engineering machinery technology, and specifically relates to chassis structures for truck cranes and truck cranes. Background Technology

[0002] Existing truck crane chassis are mainly designed for side and front lifting operations. Under special working conditions, when the crane is required to lift loads from the rear of the truck, its anti-overturning ability is far less than that when lifting from the side or front. Therefore, existing truck cranes can only actively reduce the lifting weight when lifting from the rear, resulting in a significant decrease in rear lifting performance and seriously affecting work efficiency. Summary of the Invention

[0003] In view of at least one of the above-mentioned defects or deficiencies in the prior art, this application provides a chassis structure and a truck crane for a truck crane, which can effectively improve the side lifting performance and tail lifting performance of the crane and improve the efficiency of lifting operations.

[0004] To achieve the above objectives, this application provides a chassis structure for a truck crane, the chassis structure comprising:

[0005] The box-type frame has an inverted trapezoidal cross-section and is arranged along the front-rear direction of the truck crane;

[0006] A rear outrigger housing, disposed at the rear of the box-type frame and used to mount a rear outrigger mechanism, wherein the rear end of the rear outrigger housing has an opening for the rear outrigger mechanism to extend out; and

[0007] The slewing bearing mounting base is located between the middle and rear of the box frame.

[0008] In some embodiments, the rear outrigger housing includes an outrigger fixing housing and a reinforcing housing, the outrigger fixing housing being disposed at the rear of the box frame, and the reinforcing housing being connected to the top of the outrigger fixing housing.

[0009] In some embodiments, the box-type frame includes a frame top plate and a frame bottom plate, and the outrigger fixing box includes a fixed box top plate, a fixed box front plate, two fixed box web plates and a fixed box bottom plate, which are spliced ​​together with the fixed box top plate, the fixed box front plate, the two fixed box web plates and the fixed box bottom plate to form an outrigger cavity for accommodating the rear outrigger mechanism, and the box opening is provided at the rear end of the outrigger cavity.

[0010] In some embodiments, the reinforced box includes a top plate, a front plate, a rear plate, and two side plates, wherein the fixed top plate is joined with the top plate, front plate, rear plate, and side plates to form a closed cavity.

[0011] In some embodiments, the tail support leg housing further includes a reinforcing plate connected between the rear end plate of the reinforcing box, the top plate of the fixed box, and the belly plate of the fixed box.

[0012] In some embodiments, the reinforcing plate includes a slide rail portion extending along the front-rear direction and disposed on the inner wall of the top plate of the fixed box.

[0013] In some embodiments, two tail support legs are provided, and the two tail support legs are arranged alternately on the left and right sides of the rear of the box frame.

[0014] In some embodiments, the box-type frame includes a frame top plate, two side frame webs, and a frame bottom plate that are spliced ​​together. The width of the frame top plate is greater than the width of the frame bottom plate, and the frame top plate and the frame bottom plate are staggered end to end along the front-rear direction.

[0015] In some embodiments, the slewing bearing mounting base includes a flange plate, a cover plate, and an inspection tube. The flange plate is disposed on the top plate of the box frame, the cover plate is disposed in the middle of the flange plate to seal the middle ring area of ​​the flange plate, and the two ends of the inspection tube penetrate the cover plate and the bottom plate of the box frame.

[0016] A second aspect of this application provides a truck crane, the truck crane including the chassis structure described above for a truck crane.

[0017] The chassis structure for the truck crane in this application adopts a box-type frame with an inverted trapezoidal cross-section as the main load-bearing component of the chassis. Compared to the conventional chassis beam plus subframe load-bearing structure design, this application directly integrates the subframe and chassis structure into one unit, enabling it to perform the load-bearing functions of both the frame and chassis. This effectively eliminates the risk of chassis stress concentration. Furthermore, the box-type frame of this application can optimize the lateral load transmission path through its trapezoidal slope, forming a bidirectional bending support surface during lateral lifting, thereby improving lateral anti-overturning capability. Simultaneously, by placing the slewing bearing mounting seat at a key node in the middle and rear of the box-type frame, combined with the rear outrigger housing supporting the installation of the rear outrigger mechanism, this application achieves improved rear-side lifting performance. With the strong support of the rear outrigger mechanism, rear-side lifting performance can even be maintained without degradation, allowing the crane to achieve its expected lifting efficiency without actively reducing the rated lifting capacity for safety.

[0018] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0020] Figure 1 is a schematic diagram of a chassis structure for a truck crane according to a specific embodiment of this application;

[0021] Figure 2 is a front view of the chassis structure in Figure 1;

[0022] Figure 3 is a top view of the chassis structure in Figure 1;

[0023] Figure 4 is a side view of the chassis structure in Figure 2 from direction A.

[0024] Figure 5 is a cross-sectional view BB of the chassis structure in Figure 2;

[0025] Figure 6 is a cross-sectional view (CC) of the chassis structure in Figure 3;

[0026] Figure 7 is a schematic diagram of the internal structure of the chassis structure in Figure 1.

[0027] Explanation of reference numerals in the attached figures

[0028] 1. Frame web plate 2. Mounting seat cover plate

[0029] 3. Mounting seat stiffener plate; 4. Mounting seat cross plate

[0030] 5. Chassis roof plate 6. Flange plate

[0031] 7. Inspection pipe 8. Cover plate

[0032] 9. Reinforcing plate; 10. Reinforcing box side plate

[0033] 11 Reinforcing box front panel 12 Reinforcing box top panel

[0034] 13 Fixed top plate of the box 14 Fixed bottom plate of the box

[0035] 15 Fixed box web plate 16 Chassis floor plate

[0036] 17 Frame stiffeners 18 Frame crossbars

[0037] 19. Frame longitudinal plate; 20. Reinforcing box rear end plate. Detailed Implementation

[0038] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0039] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0040] As shown in Figures 1 to 6, a first exemplary embodiment of this application provides a chassis structure for a truck crane. The chassis structure includes a box-type frame, a rear outrigger housing, and a slewing bearing mounting base. The box-type frame extends in a longitudinal direction, which can be understood as the vehicle's longitudinal direction when applied to a truck crane. Referring to Figure 4, the box-type frame has an inverted trapezoidal cross-section, meaning the top plate 5 and the bottom plate 16 are parallel to each other, and the width of the top plate 5 is greater than the width of the bottom plate 16. One side of the frame's web plate 1 is inclined and connects the outer edge of the top plate 5 and the outer edge of the bottom plate 16.

[0041] As shown in Figure 1, the rear support leg box is located at the rear of the box frame and is used to install the rear support leg mechanism. The rear end of the rear support leg box has a box opening for the rear support leg mechanism to extend out.

[0042] The slewing bearing mounting base is a mounting structure used to install the slewing bearing. It is located between the middle and rear of the box frame, that is, in the rear half of the box frame. As shown in Figure 1, the box frame can have a notch reserved for installing the slewing bearing mounting base. The slewing bearing mounting base can be integrally welded into the box frame, thus forming an integrated structure with the box frame.

[0043] Therefore, the chassis structure of this exemplary embodiment can be applied to truck cranes. By using a box-type frame with an inverted trapezoidal cross-section as the main load-bearing component of the vehicle chassis, the box-type frame combines the load-bearing functions of a frame and a conventional vehicle chassis. Compared to the combined design of crossbeams and subframes in conventional vehicle chassis, the chassis structure of this embodiment can effectively eliminate the risk of stress concentration at the connection between the subframe and the chassis. Furthermore, its trapezoidal slope optimizes the transmission path of lateral loads. In other words, during lateral lifting, the web plate 1 of the box-type frame can form a bidirectional bending support surface, thereby improving the lateral anti-overturning capability of the truck crane. In addition, by placing the slewing bearing mounting seat in the middle and rear section of the box-type frame, the slewing center of the crane is positioned rearward, increasing the crane's close-range operating range. Crucially, during rear-end lifting, the chassis's center of gravity is positioned in front of the crane's rotation center, providing the vehicle with an anti-overturning moment opposite to the overturning moment. Combined with the rear outrigger housing supporting the installation of the rear outrigger mechanism, which further provides anti-rear-end overturning support, the truck crane's rear-end lifting performance is significantly enhanced. With the strong support of the rear outrigger mechanism, rear-end lifting performance can even be maintained without any degradation, allowing the crane to achieve its intended lifting efficiency without needing to actively reduce the rated lifting capacity for safety.

[0044] In one embodiment, the structure of the tail support leg housing can be further strengthened by a split-type tail support leg housing design. Specifically, as shown in Figures 1 and 4, the tail support leg housing includes a support leg fixing housing and a reinforcing housing. The support leg fixing housing is located at the rear of the box frame, and the reinforcing housing is connected between the top of the support leg fixing housing and the top of the box frame. The support leg fixing housing is used to install the tail support leg mechanism, and the reinforcing housing is used to enhance the structural strength and rigidity of the support leg fixing housing, preventing deformation under stress, thereby improving lifting capacity and safety. Simultaneously, by integrating the reinforcing housing with the top of the box frame, the reaction force of the support legs is dispersed along the top plate 5 of the frame, thereby increasing the lifting capacity of the crane's tail section.

[0045] In one embodiment, as shown in Figures 4 to 6, the box-type frame includes a frame top plate 5 and a frame bottom plate 16. The outrigger fixing box includes a fixing box top plate 13, a fixing box front end plate, two fixing box web plates 15 and a fixing box bottom plate 14 that are arranged opposite each other. The frame top plate 5 and the frame bottom plate 16 are spliced ​​together with the fixing box top plate 13, the fixing box front end plate, the two fixing box web plates 15 and the fixing box bottom plate 14 to form an outrigger cavity for accommodating the rear outrigger mechanism. The rear end of the outrigger cavity has a box opening.

[0046] Therefore, the outrigger fixing box in this embodiment is formed by precisely splicing multiple plates to form a modular box structure. The outrigger fixing box shares the frame top plate 5 and frame bottom plate 16 with the box-type frame. Through high-strength welding or bolting, it is welded together with the fixing box top plate 13, fixing box front end plate, two fixing box web plates 15, and fixing box bottom plate 14 to form an outrigger cavity for installing the rear outrigger mechanism. This allows the dynamic load on the rear outrigger mechanism to be evenly distributed along the perimeter of the outrigger cavity when it extends for support, avoiding weld cracking caused by stress concentration in traditional integral cast boxes. The symmetrical fixing box web plates 15 on both sides form a double shear wall structure with the frame top plate 5 and frame bottom plate 16, significantly improving the lateral shear resistance of the outrigger cavity. The front plate of the fixed box facilitates the extension of the reaction force of the tail outrigger mechanism. At the same time, the top plate 13 and the bottom plate 14 of the fixed box can limit the opening height of the box opening. While ensuring that the outriggers can extend without interference throughout their entire stroke, the flange reinforcement of the box opening edge can suppress local deformation and ensure the displacement accuracy of the tail outrigger mechanism under tail load.

[0047] In one embodiment, as shown in Figures 4 to 6, the reinforcing housing includes a top plate 12, a front plate 11, a rear plate 20, and two side plates 10. A fixed top plate 13 is joined with the top plate 12, front plate 11, rear plate 20, and side plates 10 to form a closed cavity. The rear end of the frame top plate 5 has a notch, and the fixed top plate 13 is lower than the frame top plate 5, allowing the reinforcing housing to be partially fitted onto the fixed top plate 13 through the notch. In this case, the frame top plate 5 is connected to the rear plate 20 and side plates 10, thereby strengthening the connection between the outrigger fixing housing and the frame top plate 5 and improving the bending stiffness of the outrigger fixing housing.

[0048] The reinforced housing in this embodiment can be pre-formed as an independent module before the final assembly of the vehicle frame, such as by welding. It can then be precisely connected to the tail end notch of the vehicle frame top plate 5 and welded onto the fixed housing top plate 13, simplifying the assembly process. In addition, the interior of the enclosed cavity can be reserved with channels for hydraulic lines to avoid the risk of damage to exposed pipelines.

[0049] In one embodiment, as shown in Figures 4 to 6, the tail support leg housing further includes a reinforcing plate 9 connecting the rear end plate 20, the side plate 10, the top plate 13, and the belly plate 15 of the reinforcing box. This reinforcing plate 9 is equivalent to a door-shaped panel installed at the edge of the box opening, serving to strengthen the structural stability and effectively solving the problem of box cracking.

[0050] Furthermore, the reinforcing plate 9 includes a slide rail extending along the front-rear direction and arranged on the inner wall of the fixed box top plate 13. The slide rail dynamically engages with the outrigger roller assembly of the rear outrigger mechanism, allowing the slide rail to guide the linear movement of the rear outrigger mechanism in the front-rear direction, reducing extension / retraction errors. Under rear-end impact loads, the reinforcing plate 9 can use the slide rail to transmit the outrigger reaction force to the fixed box top plate 13 and the fixed box web plate 15, which then distributes it to the entire box frame, improving the overall vehicle's lifting load capacity.

[0051] In one embodiment, as shown in Figure 1, there are two tail support leg boxes, which are arranged at intervals on the left and right sides of the rear of the box frame, so that two sets of tail support leg mechanisms can be installed to increase the rear lifting capacity.

[0052] In one embodiment, as shown in Figures 1 and 7, the box-type frame includes a frame top plate 5, two side frame web plates 1, and a frame bottom plate 16 assembled together. The width of the frame top plate 5 is greater than the width of the frame bottom plate 16, and the frame top plate 5 and the frame bottom plate 16 are staggered end-to-end in the front-rear direction. In other words, the front end of the frame top plate 5 is offset from the front end of the frame bottom plate 16 in the front-rear direction, and the rear end of the frame top plate 5 is also offset from the rear end of the frame bottom plate 16 in the front-rear direction. For example, in the embodiment shown in Figure 1, the front end of the frame bottom plate 16 extends forward beyond the front end of the frame top plate 5, and the rear end of the frame top plate 5 extends rearward beyond the rear end of the frame bottom plate 16. This application does not limit the front-rear positional relationship between the ends of the top plate and the bottom plate. Similarly, this application does not limit the length difference between the frame top plate 5 and the frame bottom plate 16; for example, the length of the frame top plate 5 may be less than the length of the frame bottom plate 16. By employing the aforementioned staggered arrangement, the connection points and force transmission paths of the structure can be effectively increased during the welding of the plates. For example, when the frame frame has staggered frame stiffeners 17, frame transverse plates 18, and frame longitudinal plates 19, these stiffeners 17, transverse plates 18, and longitudinal plates 19 can all be added at the positions where the frame top plate 5 and the frame bottom plate 16 are staggered. This allows the load to be transmitted more evenly to the center of the chassis structure when it is under load. At the same time, it can also avoid weld concentration, resulting in a more uniform distribution of welding stress, reducing problems such as structural cracking caused by stress concentration, and improving the overall strength and stability of the chassis structure.

[0053] The inverted trapezoidal box structure, consisting of a frame top plate 5, two frame web plates 1, and a frame bottom plate 16, can save space for the vehicle chassis. Appropriately increasing the height of the box frame can enhance the chassis rigidity and improve the side-lifting performance of the crane. This is something that cannot be achieved by a general chassis structure using a subframe, especially at the same height dimensions, where the side-lifting performance of a general chassis is far inferior to that of the chassis structure of this application.

[0054] In one embodiment, as shown in Figures 3 and 7, the slewing bearing mounting base includes a flange plate 6, a cover plate 8, and an inspection pipe 7. The flange plate 6 is mounted on the top plate 5 of the box-type vehicle frame and can be connected to the top plate 5 by welding or bolting. The cover plate 8 is located in the middle of the flange plate 6 to seal the central area of ​​the flange plate 6. Similarly, the cover plate 8 can also be connected to the flange plate 6 by welding or bolting. By sealing the central area of ​​the flange plate 6, external contaminants can be prevented from entering the slewing bearing. The two ends of the inspection pipe 7 penetrate the cover plate 8 and the bottom plate 16 of the box-type vehicle frame, allowing maintenance personnel to directly access the slewing bearing mounted on the flange plate 6 from under the vehicle for maintenance, thereby greatly reducing the difficulty of on-site maintenance.

[0055] In other embodiments, as shown in Figures 3 and 7, the slewing bearing mounting base further includes a mounting base sealing plate 2, a mounting base stiffening plate 3, and a mounting base transverse plate 4. The mounting base stiffening plate 3 and the mounting base transverse plate 4 are arranged alternately within the slewing bearing mounting base, forming multiple enclosed box structures. These structures connect the flange plate 6 to the frame web 1 as a single unit, enhancing the load-bearing capacity of the slewing bearing mounting base and reducing structural safety issues such as deformation. The mounting base sealing plate 2 can enclose and seal the portion of the slewing bearing mounting base protruding from the frame web 1, effectively strengthening the anti-tilting capability of the slewing bearing mounting base.

[0056] A second exemplary embodiment of this application provides a truck crane that includes the chassis structure described above for a truck crane. Obviously, the truck crane of this exemplary embodiment possesses all the technical features derived from the aforementioned chassis structure, and therefore will not be repeated here.

[0057] In practical applications, the aforementioned chassis structure is suitable for articulated boom truck cranes. An articulated boom truck crane adds an articulated boom section to a conventional crane boom, essentially adding an extra joint, making it more flexible for operation in low-ceilinged spaces. The chassis structure of this application serves as the support structure for both the upper and lower vehicles, eliminating the need for an additional subframe to support the upper vehicle. This results in a higher degree of chassis integration, contributing to undiminished performance in rear and side lifting.

[0058] In the description of this application, it should be understood that 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. Therefore, 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.

[0059] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a connection that allows communication between components; 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 based on the specific circumstances.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A chassis structure for a truck crane, characterized in that, The chassis structure includes: a box frame with an inverted trapezoidal cross-section arranged along the front-rear direction of the truck crane; a rear outrigger box, located at the rear of the box frame and used to install a rear outrigger mechanism, the rear end of the rear outrigger box having an opening for the rear outrigger mechanism to extend out; and a slewing bearing mounting seat, located between the middle and rear of the box frame.

2. The chassis structure for a truck crane according to claim 1, characterized in that, The rear outrigger housing includes an outrigger fixing housing and a reinforcing housing. The outrigger fixing housing is located at the rear of the box frame, and the reinforcing housing is connected to the top of the outrigger fixing housing.

3. The chassis structure for a truck crane according to claim 2, characterized in that, The box-type frame includes a frame top plate (5) and a frame bottom plate (16). The outrigger fixing box includes a fixed box top plate (13), a fixed box front end plate, two fixed box belly plates (15) placed on the left and right, and a fixed box bottom plate (14). The frame top plate (5) and the frame bottom plate (16) are spliced ​​together with the fixed box top plate (13), the fixed box front end plate, the two fixed box belly plates (15) and the fixed box bottom plate (14) to form an outrigger cavity for accommodating the rear outrigger mechanism. The box opening is provided at the rear end of the outrigger cavity.

4. The chassis structure for a truck crane according to claim 3, characterized in that, The reinforced box includes a reinforced box top plate (12), a reinforced box front end plate (11), a reinforced box rear end plate (20), and two reinforced box side plates (10). The fixed box top plate (13) is spliced ​​with the reinforced box top plate (12), the reinforced box front end plate (11), the reinforced box rear end plate (20), and the two reinforced box side plates (10) to form a closed cavity.

5. The chassis structure for a truck crane according to claim 4, characterized in that, The tail support leg box also includes a reinforcing plate (9) connecting the rear end plate (20) of the reinforcing box, the side plate (10) of the reinforcing box, the top plate (13) of the fixed box and the belly plate (15) of the fixed box.

6. The chassis structure for a truck crane according to claim 5, characterized in that, The reinforcing plate (9) includes a slide rail portion that extends along the front-rear direction and is arranged on the inner wall of the top plate (13) of the fixed box.

7. The chassis structure for a truck crane according to claim 1, characterized in that, The rear support leg housing is provided in two parts, and the two rear support leg housings are arranged alternately on the left and right sides of the rear of the box frame.

8. The chassis structure for a truck crane according to any one of claims 1 to 7, characterized in that, The box-type frame includes a frame top plate (5) assembled together, frame web plates (1) on both sides, and frame bottom plate (16). The width of the frame top plate (5) is greater than the width of the frame bottom plate (16). The frame top plate (5) and the frame bottom plate (16) are staggered end to end along the front-rear direction.

9. The chassis structure for a truck crane according to any one of claims 1 to 7, characterized in that, The slewing bearing mounting base includes a flange plate (6), a cover plate (8), and a maintenance tube (7). The flange plate (6) is disposed on the top plate (5) of the box frame. The cover plate (8) is disposed in the middle of the flange plate (6) to seal the middle ring area of ​​the flange plate (6). The two ends of the maintenance tube (7) penetrate the cover plate (8) and the bottom plate (16) of the box frame.

10. A truck crane, characterized in that, The truck crane includes a chassis structure for a truck crane according to any one of claims 1 to 9.

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