Composite cantilever crane and concrete pump truck

Abstract

The utility model discloses a composite arm support in the technical field of engineering machinery, and aims to solve the problems that a concrete pump truck arm support in the prior art is usually made of steel, and the dead weight of the steel is larger, so that a chassis required by a pump truck is heavier, and the lightweight requirement of the arm support is difficult to meet. The robot arm comprises a box body, an arm head and an arm tail are arranged at the two ends of the box body respectively, the box body, the arm head and the arm tail are each of a composite layer structure, and each composite layer structure comprises a supporting layer and a protection layer arranged on the supporting layer; the supporting layer is made of carbon fibers; the supporting layer is protected by the protective layer in all directions, so that the carbon fibers are not exposed outside, the defect that the carbon fibers are sharp and easy to damage is avoided, the characteristics of low density, high strength, high elastic modulus and good weight reduction effect of the carbon fibers are utilized, and the overall structure of the cantilever crane is lightened through the matching of the supporting layer and the protective layer; the requirement for light weight of the arm support is met, and meanwhile it is guaranteed that the arm support is high in structural strength and rigidity.

Description

Technical Field

[0001] The utility model relates to a composite boom and a concrete pump truck, belonging to the technical field of engineering machinery. Background Art

[0002] At present, the booms of concrete pump trucks or concrete placing machines on the market are mostly box-shaped structures welded from steel plates. Due to the rich technical accumulation of steel and mature manufacturing technology, steel booms are widely used on pump trucks. In the early stage of pump truck development, the boom length of pump trucks was several millimeters, the weight was light, and the load on the chassis of the pump truck was small. However, with the development of concrete machinery itself and the urgent need for high-rise building construction, super-long booms with large numbers of meters have emerged. With the increase in the length of the boom, the weight of the steel boom is seriously exceeded, which requires more bridges and longer car chassis to carry it. At the same time, the span of the legs will increase, and more space will be required during construction. At this time, a series of problems will arise. The space left on the construction site is small, the pump truck cannot be constructed, and the conditions for going on the road are not met. Therefore, the same chassis is required, the whole vehicle is not overweight, the bridge load is not overweight, and a larger number of meters of pump trucks are obtained. At present, the three-axle vehicle has a load capacity of 35 tons and a maximum length of 56 meters. The four-axle vehicle has a load capacity of 45 tons and a maximum length of 65 meters. The five-axle vehicle has a load capacity of 55 tons and a maximum length of 72 meters. To make further breakthroughs on this basis, new materials need to be used in the boom design.

[0003] The material commonly used for the boom of existing concrete pump trucks is usually steel. The dead weight of steel is relatively large, which results in a heavier chassis required for the pump truck, making it difficult to meet the lightweight requirements of the boom, thus affecting the practicability of the device. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and to provide a composite boom and a concrete pump truck, so as to solve the problem that the existing concrete pump truck boom is usually made of steel, which has a large dead weight, resulting in a heavier chassis required for the pump truck, making it difficult to meet the lightweight requirements of the boom.

[0005] In order to solve the above technical problems, the utility model is implemented by adopting the following technical solutions:

[0006] In the first aspect, the utility model provides a composite arm support, including a box body, wherein an arm head and an arm tail are respectively provided at both ends of the box body, and the box body, the arm head and the arm tail are all composite layer structures, and the composite layer structure includes a supporting layer and a protective layer arranged on the supporting layer; the material of the supporting layer is carbon fiber.

[0007] Furthermore, the material of the protective layer is light alloy or steel plate.

[0008] Furthermore, the light alloy includes aluminum alloy, magnesium alloy and titanium alloy.

[0009] Furthermore, a plurality of brackets are detachably connected to one side of the outer wall of the box.

[0010] Furthermore, the bracket includes a bracket tube, one end of the bracket tube is provided with a connecting frame, and the other end of the bracket tube is detachably connected to the outer wall of the box body.

[0011] Furthermore, a first step is integrally connected to the support layer of the arm head, and the first step is located on the outside of the arm head; a second step is integrally connected to the support layer of the arm tail, and the second step is located on the outside of the arm tail; a first groove matching the first step is opened at one end of the box body, and a second groove matching the second step is opened at the other end of the box body.

[0012] Furthermore, a first inner step is integrally connected to an outer wall of the first step close to one side of the box body, a second inner step is integrally connected to an outer wall of the second step close to one side of the box body, a third groove matching the first inner step is provided on one side of an inner wall of the first groove, and a fourth groove matching the second inner step is provided on one side of an inner wall of the second groove.

[0013] Furthermore, the arm head is detachably connected to the box body via a first bolt, and the arm tail is detachably connected to the box body via a second bolt.

[0014] In a second aspect, the utility model provides a concrete pump truck, comprising the composite boom described in the first aspect.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The composite boom uses carbon fiber as a supporting layer and light alloy as a protective layer. The supporting layer is used as the inner layer of the composite layer structure, and the protective layer is used as the outer layer of the composite layer structure. The supporting layer is protected by the protective layer in all directions, so that the carbon fiber is not exposed to the outside, avoiding the disadvantages of carbon fiber being sharp and easy to be damaged. The characteristics of carbon fiber are low density, high strength, large elastic modulus, and good weight reduction effect. The supporting layer and the protective layer are coordinated to make the overall structure of the boom lighter, meet the lightweight requirements of the boom, and at the same time ensure the high structural strength and high rigidity of the boom;

[0017] 2. The composite boom does not need to add a new connection mechanism on the boom head, the box body and the boom tail when connecting the boom head, the box body and the boom tail, and ensures the stability of the connection between the boom head, the box body and the boom tail, while ensuring the protective effect of the protective layer on the supporting layer, thereby ensuring the convenience and practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side cross-sectional schematic diagram of a box provided according to an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of a three-dimensional structure of a composite boom provided according to an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of a box provided according to an embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of a front cross-section of a box provided according to an embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of a front cross-section of an arm head provided according to an embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the front cross-section of the boom tail provided according to an embodiment of the utility model;

[0024] Figure 7 This is a main cross-sectional view of the arm head and the box body when they are connected according to an embodiment of the utility model.

[0025] In the figure: 1. box body; 2. arm head; 3. arm tail; 4. support layer; 5. protective layer; 6. bracket; 7. first step; 8. second step; 9. first slot; 10. second slot; 11. first inner step; 12. second inner step; 13. third slot; 14. fourth slot. 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] Embodiment 1:

[0030] like Figure 1-5 As shown, the utility model provides a composite arm support, including a box body 1, wherein an arm head 2 and an arm tail 3 are respectively provided at both ends of the box body 1, the box body 1, the arm head 2 and the arm tail 3 are all composite layer structures, and the composite layer structure includes a supporting layer 4 and a protective layer 5 arranged on the supporting layer 4; the material of the supporting layer 4 is carbon fiber.

[0031] Specifically, the present application adopts a supporting layer 4 to ensure the rigidity and strength of the box body 1, the arm head 2 and the arm tail 3, and then covers the supporting layer 4 with a protective layer 5 to prevent the supporting layer 4 from being exposed, thereby protecting the supporting layer 4 and ensuring the stability of the structure of the box body 1, the arm head 2 and the arm tail 3; optionally, the material of the protective layer 5 is a light alloy, which includes aluminum alloy, magnesium alloy and titanium alloy, which has the advantages of high strength and hardness, good hot workability, excellent welding performance, good corrosion resistance, etc., and is an important structural material; for example, when the protective layer 5 is an aluminum alloy, since the specific gravity of the aluminum alloy is about 1 / 3 of that of steel, but the elastic modulus is also close to 1 / 3 of that of steel, in order to ensure the rigidity of the boom, it can only be achieved by increasing the material thickness. Usually, the aluminum alloy plate with the same cross-section is about twice that of the steel plate. For an extra-long boom, it needs to be more than twice, and the weight reduction effect is limited; the material of the supporting layer 4 is carbon fiber, and carbon fiber has a carbon content of 9 More than 5% of high-strength, high-modulus fiber materials have a specific gravity of less than 1 / 4 of that of steel, a tensile strength of more than 3500-5500Mpa, an elastic modulus of 230-600Gpa, an elastic modulus of two to three times that of steel, and a tensile strength of two to five times that of steel. Its ability to resist sharp damage is very poor, and it is easily damaged by a slight collision with sharp objects, and cannot be repaired; In summary, the present application uses carbon fiber as the support layer 4, and a light alloy as the protective layer 5, and the support layer 4 is used as the inner layer of the composite layer structure, and the protective layer 5 is used as the outer layer of the composite layer structure. The support layer 4 is protected in all directions by the protective layer 5, so that the carbon fiber is not exposed to the outside, avoiding the shortcomings of carbon fiber being sharp and easy to damage. The characteristics of carbon fiber, such as low density, high strength, large elastic modulus, and good weight reduction effect, are utilized. The support layer 4 cooperates with the protective layer 5 to make the overall structure of the boom lighter, meet the lightweight requirements of the boom, and at the same time ensure that the structural strength and rigidity of the boom are high.

[0032] In one embodiment, a plurality of brackets 6 are detachably connected to one side of the outer wall of the box body 1, and the bracket 6 includes a bracket tube, one end of the bracket tube is provided with a connecting frame, and the other end of the bracket tube is detachably connected to the outer wall of the box body 1, and the bracket 6 is used to support the conveying pipe. Optionally, the bracket tube and the connecting frame are made of light alloy or steel plate; thinner steel plate can be used instead of light alloy to play a protective role.

[0033] like Figure 4-7As shown, an embodiment is shown, a first step 7 is integrally connected to the supporting layer 4 of the arm head 2, and the first step 7 is located on the outside of the arm head 2; a second step 8 is integrally connected to the supporting layer 4 of the arm tail 3, and the second step 8 is located on the outside of the arm tail 3; a first groove 9 matching the first step 7 is opened on one side of the outer wall of the box body 1, and a second groove 10 matching the second step 8 is opened on the other side of the outer wall of the box body 1; a first inner step 11 is integrally connected to the outer wall of the first step 7 close to the box body 1, and a second inner step 12 is integrally connected to the outer wall of the second step 8 close to the box body 1; a third groove 13 matching the first inner step 11 is opened on one side of the inner wall of the first groove 9, and a fourth groove 14 matching the second inner step 12 is opened on one side of the inner wall of the second groove 10.

[0034] Specifically, the supporting layer 4 at both ends of the box body 1 is shorter than the protective layer 5 to form a first groove 9 and a second groove 10. A first step 7 is integrally formed on one side of the outer wall of the supporting layer 4 of the arm head 2, that is, one end of the supporting layer 4 extends to the outside of the arm head 2 to form the first step 7. The first step 7 is located on the outside of the protective layer 5 of the arm head 2, so that the protective layer 5 of the arm head 2 and the first step 7 are staggered, and the supporting layer 4 and the protective layer 5 of the arm head 2 are compounded together, so that the protective layer 5 also participates in the force of the first step 7, thereby ensuring the stability of the arm head 2 when connected to the box body 1. The second step 8 on the arm tail 3 is the same as above, and there is no need to add other lining metal structures, and the force of the first step 7 and the second step 8 is shared by the protective layer 5, thereby ensuring the installation The stability of the structure; optionally, the support layer 4 on the side of the first step 7 in the arm head 2 is thickened, thereby reducing the stress at the docking position between the arm head 2 and the box body 1 and avoiding cracking at the docking position, and the support layer 4 on the side of the second step 8 in the arm tail 3 is thickened to avoid cracking at the docking position; further, a first inner step 11 is integrally formed on one side of the outer wall of the first step 7, and a second inner step 12 is integrally formed on one side of the outer wall of the second step 8. When the arm head 2 is connected to the box body 1, after the first step 7 is fully inserted into the first groove 9, the first inner step 11 moves to the inside of the third groove 13 and fits therewith, thereby increasing the contact area between the support layer 4 of the arm head 2 and the support layer 4 of the box body 1. At this time, low temperature stirring can be used The protective layer 5 of the arm head 2 is connected to the protective layer 5 of the box body 1 by friction stir welding to avoid damage to the supporting layer 4, and then the first inner step 11 is connected to the third groove 13 by glue to glue the supporting layer 4 of the arm head 2 to the supporting layer 4 of the box body 1. A process hole can be appropriately opened on the arm head 2 or the box body 1 to complete the connection between the arm head 2 and the box body 1. The connection process of the arm tail 3 and the box body 1 is the same as above. The second step 8 is inserted into the second groove 10 so that the second inner step 12 moves to the fourth groove 14, and the protective layer 5 of the arm tail 3 is connected to the protective layer 5 of the box body 1 by low-temperature friction stir welding, and the supporting layer 4 of the arm tail 3 is glued to the supporting layer 4 of the box body 1. The present application staggers the connection position of the protective layer 5 between the arm head 2, the box body 1 and the arm tail 3 and the connection position of the support layer 4, thereby avoiding fractures at the connection points and ensuring the stability of the device structure; when the present application connects the arm head 2, the box body 1 and the arm tail 3, there is no need to add a new connection mechanism on the arm head 2, the box body 1 and the arm tail 3, and ensures the stability of the connection between the arm head 2, the box body 1 and the arm tail 3, while ensuring the protective effect of the protective layer 5 on the support layer 4, thereby ensuring the convenience and practicality of the device; optionally, the connection of the support layer 4 between the arm head 2, the box body 1 and the arm tail 3 can also adopt methods such as carbon fiber plasticity; the arm head 2, the box body 1 and the arm tail 3 can be integrally formed or formed by welding during processing and manufacturing;The box body 1 can be processed by welding or integral molding. The box body 1 includes four surfaces: upper, lower, left and right. The support layer 4 of each surface can adopt different thicknesses, so that the arm frame is basically an equal strength beam, which can adapt to different length positions and stiffness requirements. ;

[0035] In one embodiment, the arm head 2 is detachably connected to the box body 1 via a first bolt, and the arm tail 3 is detachably connected to the box body 1 via a second bolt. The connection between the arm head 2, the box body 1 and the arm tail 3 can be performed by threaded connection.

[0036] Embodiment 2:

[0037] The utility model provides a concrete pump truck, comprising the composite boom described in the first embodiment.

[0038] 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 composite boom, characterized in that: The invention comprises a box body (1), wherein an arm head (2) and an arm tail (3) are respectively arranged at two ends of the box body (1), wherein the box body (1), the arm head (2) and the arm tail (3) are all composite layer structures, wherein the composite layer structure comprises a support layer (4) and a protective layer (5) arranged on the support layer (4); the material of the support layer (4) is carbon fiber.

2. A composite boom according to claim 1, characterized in that: The material of the protective layer (5) is a light alloy or a steel plate.

3. A composite boom according to claim 2, characterized in that: The light alloys include aluminum alloys, magnesium alloys and titanium alloys.

4. A composite boom according to claim 1, characterized in that: A plurality of brackets (6) are detachably connected to one side of the outer wall of the box body (1).

5. A composite boom according to claim 4, characterized in that: The bracket (6) comprises a bracket tube, one end of which is provided with a connecting frame, and the other end of which is detachably connected to the outer wall of the box body (1).

6. The composite boom according to claim 1, characterized in that: A first step (7) is integrally connected to the support layer (4) of the arm head (2), and the first step (7) is located on the outside of the arm head (2); a second step (8) is integrally connected to the support layer (4) of the arm tail (3), and the second step (8) is located on the outside of the arm tail (3); a first groove (9) matching the first step (7) is formed at one end of the box body (1), and a second groove (10) matching the second step (8) is formed at the other end of the box body (1).

7. A composite boom according to claim 6, characterized in that: The first step (7) is integrally connected to a first inner step (11) on the outer wall close to the box body (1), the second step (8) is integrally connected to a second inner step (12) on the outer wall close to the box body (1), the first groove (9) is provided with a third groove (13) matching the first inner step (11) on the inner wall, and the second groove (10) is provided with a fourth groove (14) matching the second inner step (12) on the inner wall.

8. The composite boom according to claim 1, characterized in that: The arm head (2) is detachably connected to the box body (1) via a first bolt, and the arm tail (3) is detachably connected to the box body (1) via a second bolt.

9. A concrete pump truck, characterized in that: A composite boom comprising the composite boom described in any one of claims 1 to 8.

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