Lightweight frame and wheeled crane

Abstract

The utility model discloses a light-weight frame which comprises a frame front section and a frame rear section, a front fixed supporting leg box is arranged at the front end of the frame rear section, a rear fixed supporting leg box is arranged at the rear end of the frame rear section, the frame front section is made of high-strength aluminum alloy, and the frame rear section, the front fixed supporting leg box and the rear fixed supporting leg box are made of high-strength steel plates. A connecting transition section is arranged between the frame front section and the front fixed supporting leg box; and a plurality of non-bearing brackets are inserted into the frame rear section. Based on the material technology and the manufacturing technology which can be obtained by mass production at present, by combining the stress characteristics of the crane frame, through the specific structure arrangement and material selection combination design, the structure and material performance are released, the weight of the frame is reduced, and the requirement for improving the overall performance is met; meanwhile, manufacturing efficiency is improved, and manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to a lightweight frame and a wheeled crane, belonging to the technical field of engineering machinery frames. Background Art

[0002] With the market's continuous demand for upgraded lifting performance: the boom is getting longer and longer, the cross-section is getting larger and larger, the counterweight is getting heavier, and the outrigger span is getting longer and longer. However, the total mass of the vehicle is limited by the restrictions on axle weights by road regulations: the maximum load of a single tire on both sides is 12 tons, and the maximum load of a double tire on both sides is 13 tons. Therefore, the demand for lightweight components is becoming more and more urgent. As the frame accounts for more than 10% of the mass, its lightweight design is particularly important.

[0003] The current lightweight frame design scheme is mainly a thin-walled large box type with variable cross-section, variable plate thickness and high-strength steel plate implementation plan. The main idea is to use the least material to enclose the largest closed space, increase the moment of inertia of the section, and maximize the tensile and bending properties of the material. However, this scheme is subject to many restrictions during design, which come from the layout, steel performance, and manufacturing process level. The weight reduction of the scheme that can be implemented in the end is often very small and cannot meet the requirements of the overall design.

[0004] The main problems of the prior art are:

[0005] 1. Due to the overall layout and the movement of components, the maximum space that the frame can enclose is limited. For a certain cross section, the maximum area that can be enclosed is certain, and the current design has infinitely approached this threshold;

[0006] 2. Limited by the current manufacturing level (welding technology, assembly process) and the inherent characteristics of welded components (the risk of manufacturing defects in the weld area is always there), the feasible lightweight solutions are limited (must be fully verified and have mass implementation).

[0007] In summary, without major technological breakthroughs and the emergence of new manufacturing capabilities for mass production, the ceiling of lightweight frame design based on high-strength steel plates is already visible. Judging from the design cases of some current high-end models, the failure to reduce the frame weight has become a bottleneck for further improving the overall design performance and needs to be solved urgently. Utility Model Content

[0008] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a lightweight frame and a wheeled crane using the lightweight frame. The utility model is based on the material technology and manufacturing technology that can be obtained for mass production, combined with the stress characteristics of the crane frame, and releases the structure and material properties through a combined design to achieve frame weight reduction and meet the demand for overall performance improvement; at the same time, it improves manufacturing efficiency and reduces manufacturing costs.

[0009] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0010] In a first aspect, the utility model provides a lightweight frame, comprising a front frame section and a rear frame section, a front fixed leg box being arranged at the front end of the rear frame section, and a rear fixed leg box being arranged at the rear end, the front frame section is made of aluminum alloy, the rear frame section, the front fixed leg box and the rear fixed leg box are made of steel plates, a connecting transition section is arranged between the front frame section and the front fixed leg box; a plurality of non-load-bearing brackets are detachably connected to the rear frame section.

[0011] Furthermore, the aluminum alloy is a high-strength aluminum alloy with a strength range of more than 300Mpa; the front section of the frame is welded from the high-strength aluminum alloy plate. Depending on the application scenario, carbon fiber material can also be used to achieve a better lightweight effect.

[0012] Furthermore, the steel plate is a high-strength steel plate with a strength higher than 345Mpa; the rear section of the frame, the front fixed leg box and the rear fixed leg box are made by welding the high-strength steel plate.

[0013] Furthermore, since aluminum steel is difficult to weld and its quality is unstable, the present application structurally uses a connecting transition section to connect the front section of the frame with the front fixed leg box. The material of the connecting transition section is the same as that of the front fixed leg box and is connected by welding. The front end of the connecting transition section matches the rear end structure of the front section of the frame and is connected in an assembled manner. The contacting end faces can adopt a male and female groove structure or the same plane structure and then be connected by bolts.

[0014] Furthermore, the non-load-bearing bracket is made of a lightweight non-metallic material. The non-metallic material may be nylon with added glass fiber, and its tensile strength may reach 150-170 MPa; it may also be PVC reinforced plastic, or PDCPD plastic, etc.

[0015] Furthermore, the non-load-bearing bracket includes but is not limited to a walkway bracket, a fender bracket, a tailboard bracket, a cover bracket, etc.

[0016] Furthermore, a plurality of bracket bases are fixed on the rear section of the frame, and the bracket bases are provided with guide fixing grooves matching the non-load-bearing brackets, and the non-load-bearing brackets are fixedly connected to the bracket bases after being inserted into the guide fixing grooves. The brackets can be fixed by locking bolts after the insertion is completed.

[0017] In a second aspect, the utility model further provides a wheeled crane, wherein the wheeled crane adopts the lightweight frame described in the first aspect.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The lightweight frame of the utility model is based on the material technology and manufacturing technology that can be obtained in mass production at present, combined with the force characteristics of the crane frame, and through a specific structural setting and material selection combined design, the structure and material properties are released to achieve frame weight reduction and meet the demand for overall performance improvement; at the same time, the manufacturing efficiency is improved and the manufacturing cost is reduced;

[0020] The lightweight frame of the utility model can reduce the overall weight by about 10%, and the total weight of the frame of a hundred-ton-class vehicle of 6-7 tons can be reduced by 600-700 kg, providing greater room for overall matching and performance improvement.

[0021] The lightweight frame of the utility model adopts an insertion method to install the non-load-bearing bracket, replacing the design of traditional fastener installation, which can reduce the time of on-site assembly and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a lightweight frame provided in Example 1;

[0023] Figure 2 It is a structural schematic diagram of the front section of the frame and the connecting transition section described in Example 1;

[0024] Figure 3 This is a schematic diagram of the installation structure of the non-load-bearing bracket described in Example 1.

[0025] In the figure: 1. front section of the frame; 2. front fixed leg box; 3. rear section of the frame; 4. rear fixed leg box; 5. non-load-bearing bracket; 6. connecting transition section; 7. bracket base. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0027] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 therefore cannot be understood as a limitation on 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 number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0029] Example 1

[0030] This embodiment provides a lightweight frame, such as Figure 1 As shown, it includes a front frame section 1 and a rear frame section 3, a front fixed leg box 2 is welded and fixed to the front end of the rear frame section 3, and a rear fixed leg box 4 is welded and fixed to the rear end, and a connecting transition section 6 is arranged between the front frame section 1 and the front fixed leg box 2; a plurality of non-load-bearing brackets 5 are inserted on the rear frame section 3.

[0031] In this embodiment, according to the stress characteristics of the frame, the rear section 3 of the frame, which is subjected to the greatest stress and the worst working conditions, the front fixed leg box 2 and the rear fixed leg box 4 are welded with Q690 high-strength steel plates; the front section 1 of the frame, which is subjected to less stress, is welded with a high-strength aluminum alloy plate with a strength of 480Mpa; and the non-load-bearing brackets 5, such as the walkway bracket, fender bracket, tailboard bracket, cover bracket, etc., which are subjected to even less stress, are made of nylon (a type of engineering plastic with a tensile strength of 150~170Mpa) with added glass fiber.

[0032] In this embodiment, since aluminum steel is difficult to weld and has unstable quality, a high-strength steel plate connecting transition section 6 is used to connect the front section 1 of the frame and the front fixed leg box 2. The connecting transition section 6 is made of the same material as the front fixed leg box 2 and is connected by welding; the front end of the connecting transition section 6 and the rear end of the front section 1 of the frame are the same planar structure, such as Figure 2 As shown, the end faces are butted and connected by bolt assembly.

[0033] In this embodiment, a plurality of bracket bases 7 are fixed on the rear section 3 of the frame, and the bracket bases 7 are provided with guide fixing grooves matching the non-load-bearing brackets 5, such as Figure 3 As shown, after the non-load-bearing bracket 5 is inserted into the guide fixing groove, it is fixedly connected to the bracket base 7 by means of locking bolts.

[0034] Example 2

[0035] This embodiment provides a lightweight frame, such as Figure 1 As shown, it includes a front frame section 1 and a rear frame section 3, a front fixed leg box 2 is welded and fixed to the front end of the rear frame section 3, and a rear fixed leg box 4 is welded and fixed to the rear end, and a connecting transition section 6 is arranged between the front frame section 1 and the front fixed leg box 2; a plurality of non-load-bearing brackets 5 are inserted on the rear frame section 3.

[0036] In this embodiment, the rear section 3 of the frame, the front fixed leg box 2 and the rear fixed leg box 4 are made of Q460 high-strength steel plate by welding; the front section 1 of the frame is made of 300Mpa high-strength aluminum alloy plate by welding; the non-load-bearing bracket 5 is made of PVC reinforced plastic.

[0037] In this embodiment, a connection transition section 6 made of high-strength steel plate is used to connect the front section 1 of the frame and the front fixed leg box 2. The connection transition section 6 is made of the same material as the front fixed leg box 2 and is connected by welding; the front end of the connection transition section 6 and the rear end of the front section 1 of the frame are male and female groove structures that match each other (not shown in the figure), and the end faces are butted and connected by bolts.

[0038] In this embodiment, a plurality of bracket bases 7 are fixed on the rear section 3 of the frame, and the bracket bases 7 are provided with guide fixing grooves matching the non-load-bearing brackets 5. After the non-load-bearing brackets 5 are inserted into the guide fixing grooves, they are fixedly connected to the bracket bases 7 by locking bolts.

[0039] Example 3

[0040] This embodiment provides a wheeled crane, which adopts the lightweight frame described in Example 1.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A lightweight frame, characterized in that: The vehicle comprises a front frame section (1) and a rear frame section (3); a front fixed leg box (2) is arranged at the front end of the rear frame section (3), and a rear fixed leg box (4) is arranged at the rear end; the front frame section (1) is made of aluminum alloy or carbon fiber material; the rear frame section (3), the front fixed leg box (2) and the rear fixed leg box (4) are made of steel plates; a connecting transition section (6) is arranged between the front frame section (1) and the front fixed leg box (2); and a plurality of non-load-bearing brackets (5) are detachably connected to the rear frame section (3).

2. The lightweight frame according to claim 1, characterized in that: The aluminum alloy is a high-strength aluminum alloy with a strength higher than 300Mpa.

3. The lightweight frame according to claim 1, characterized in that: The steel plate is a high-strength steel plate with a strength higher than 345Mpa.

4. The lightweight frame according to claim 1, characterized in that: The material of the connecting transition section (6) is the same as that of the front fixed leg box (2), and is connected by welding; the front end of the connecting transition section (6) matches the rear end structure of the front section of the vehicle frame (1), and is connected by assembly.

5. The lightweight frame according to claim 1, characterized in that: The non-load-bearing bracket (5) is made of non-metallic material.

6. The lightweight frame according to claim 5, characterized in that: The non-metallic material used for the non-load-bearing bracket (5) includes, but is not limited to, any one of nylon with added glass fiber, PVC reinforced plastic, or PDCPD plastic.

7. The lightweight frame according to claim 1, characterized in that: The non-load-bearing bracket (5) includes but is not limited to a walkway bracket, a fender bracket, a tailboard bracket, and a cover bracket.

8. The lightweight frame according to claim 1, characterized in that: A plurality of bracket bases (7) are fixed on the rear section (3) of the frame, and the bracket bases (7) are provided with guide fixing grooves matching the non-load-bearing brackets (5). After the non-load-bearing brackets (5) are inserted into the guide fixing grooves, they are fixedly connected to the bracket bases (7).

9. A wheel crane, characterized in that: The wheeled crane adopts the lightweight frame described in any one of claims 1 to 8.

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