Variable cross-section boom and wheel excavator

Abstract

The utility model discloses a variable cross-section movable arm and a wheel excavator. The variable cross-section movable arm comprises an arm wrist, an arm body and an arm head, one end of the arm body is connected with the arm head, the arm wrist is used for connecting the variable-cross-section movable arm and a rotary platform of the excavator, the arm head is used for connecting an excavating assembly of the excavator, a variable-cross-section connecting end is arranged at the end, away from the arm head, of the arm body, and the variable-cross-section connecting end is connected with the arm wrist. Part of the arm wrist is convexly arranged at the variable cross-section connecting end; the width of the variable cross-section connecting end is gradually increased towards the direction of the arm wrist, the variable cross-section connecting end is in an isosceles trapezoid shape, and the variable cross-section connecting end and the arm body are integrally formed and connected. The variable cross-section connecting end with the width gradually increased is formed at the end of the arm body in a bending mode, so that the variable cross-section connecting end is in an isosceles trapezoid shape, the torque bearing capacity of the variable cross-section movable arm wrist is improved, the connecting stability and strength are improved, the service life is prolonged, and the safety risk is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of excavators, and particularly relates to a variable-section boom and a wheeled excavator. Background Art

[0002] The root of the boom (boom wrist) is an important connecting part in an excavator. It is responsible for connecting the boom to the upper carriage or other components, and usually involves the installation and protection of key components such as pin shafts, bushings, and hydraulic pipelines. The areas served by wheeled excavators (forestry, municipal) require the boom to have a longer length, and the width and weight of the boom are limited. At the same time, according to the previous boom structure design, cracks may occur in the welds and steel plates due to insufficient strength at the root of the boom, reducing the service life of the boom and posing a certain safety risk. Content of the Utility Model

[0003] In order to solve the above problems, the utility model provides a variable-section boom and a wheeled excavator, which can extend the service life of the boom and improve safety.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A variable-section boom is applied to an excavator and includes a boom wrist, a boom body, and a boom head;

[0006] One end of the boom body is connected to the boom head. The boom wrist is used to connect the variable-section boom to the slewing platform of the excavator. The boom head is used to connect the excavating structure of the excavator. A variable-section connection end is provided at the end of the boom body far from the boom head, and the variable-section connection end is connected to the boom wrist. Part of the boom wrist protrudes from the variable-section connection end;

[0007] The width of the variable-section connection end gradually increases in the direction towards the boom wrist and presents an isosceles trapezoid shape. The variable-section connection end is integrally formed and connected with the boom body.

[0008] Preferably, the boom body includes two webs and two cover plates. One end of each web connected to the boom wrist is bent and extended to form a first variable-section segment. Each cover plate is provided with a second variable-section segment corresponding to the variable-section segment, and the width of the second variable-section segment gradually increases in the direction towards the boom wrist. The two webs are arranged oppositely and the two cover plates enclose to form the boom body and the variable-section connection end.

[0009] Preferably, a relief groove is provided at the end where the variable-section connection end is connected to the boom wrist. The relief groove is used for the web to be attached and connected to the boom wrist.

[0010] Preferably, two reinforcing plates are provided at the variable cross-section connection end. The two reinforcing plates are connected to the inner wall of the variable cross-section connection end and the side of the arm wrist facing the variable cross-section connection end, and an included angle is formed between the two reinforcing plates.

[0011] Preferably, a first patch plate and a second patch plate are provided on the web. The first patch plate is arranged on the outer surface of the web near one end of the arm head, and the second patch plate is arranged on the outer surface of the middle part of the web.

[0012] Preferably, a third patch plate is provided at the variable cross-section connection end. The third patch plate is arranged on the surfaces of the first variable cross-section segment and the second variable cross-section segment.

[0013] Preferably, a first partition plate is provided in the arm body. The first partition plate is arranged inside the arm body.

[0014] Preferably, a connection end is provided at the arm head. The connection end is arranged at one end of the arm head far from the arm body, and the connection end is limitedly connected to the dipper arm of the excavator through a pin shaft.

[0015] Preferably, a support part is provided on the variable cross-section boom. The support part is pivotally connected to the excavation assembly through a pin shaft.

[0016] Another aspect of the present invention provides a wheeled excavator, including the above-mentioned variable cross-section boom, slewing platform, traveling structure and excavation structure. The variable cross-section boom is movably connected to the slewing platform through the arm wrist. The slewing platform is used to rotate the variable cross-section boom, and the variable cross-section boom is movably connected to the excavation structure through the arm head.

[0017] Compared with the existing technology, the beneficial effects of the present invention are as follows:

[0018] By bending, a variable cross-section connection end with a gradually increasing width is formed at the end of the arm body, so that the variable cross-section connection end is in the shape of an isosceles trapezoid. The longer the weld between the variable cross-section connection end and the arm wrist, the smaller the stress and load on the weld at the arm wrist per unit area when the variable cross-section boom is under the same load. On the premise of ensuring strength, the risk of weld and plate cracking is reduced, the torque bearing capacity of the arm wrist of the variable cross-section boom is improved, the connection stability and strength are improved, the service life is prolonged, and the safety risk is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the variable cross-section boom of the present invention;

[0020] Figure 2 is a schematic structural diagram of another embodiment of the variable cross-section boom of the present invention;

[0021] Figure 3It is the sectional view of the variable-section boom of the present utility model;

[0022] Figure 4 It is the structural schematic diagram of another embodiment of the variable-section boom of the present utility model;

[0023] Figure 5 It is the exploded view of the variable-section boom of the present utility model;

[0024] Figure 6 It is Figure 5 The enlarged view of part A in

[0025] In the attached drawings, 1 - boom wrist, 2 - boom body, 21 - variable-section connection end, 211 - relief groove, 22 - web, 221 - first variable-section segment, 23 - cover plate, 231 - second variable-section segment, 3 - boom head, 4 - reinforcing plate, 5 - first patch plate, 6 - second patch plate, 7 - first partition, 8 - connection end, 81 - connecting plate, 82 - mating backing plate, 83 - lining plate, 84 - head plate, 85 - second partition, 86 - through hole, 87 - pin-limiting U-shaped plate, 9 - support part, 10 - third patch plate. Specific embodiments

[0026] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will further describe in detail the embodiments of the present utility model with reference to the attached drawings.

[0027] When the following description refers to the attached drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present utility model. On the contrary, they are merely examples of devices and methods that are consistent with some aspects of the present utility model as detailed in the appended claims.

[0028] In the description of the present utility model, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this specification are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] The arm and wrist bear most of the stress and load during excavation and handling operations. The weight and width of the boom should be minimized as much as possible. However, reducing the width of the boom results in insufficient strength between the arm and wrist and the boom body, leading to cracking of welds and plates.

[0031] To solve the above problems, please refer to Figures 1 to 6 , this utility model provides a variable cross-section boom, which is applied to an excavator and includes an arm and wrist 1, a boom body 2, and a boom head 3. One end of the boom body 2 is connected to the boom head 3. The arm and wrist 1 is used to connect the variable cross-section boom to the slewing platform of the excavator. The boom head 3 is used to connect the excavation assembly of the excavator. A variable cross-section connection end 21 is provided at one end of the boom body 2 away from the boom head 3. The variable cross-section connection end 21 is connected to the arm and wrist 1, and part of the arm and wrist 1 protrudes from the variable cross-section connection end 21. The width of the variable cross-section connection end 21 gradually increases in the direction towards the arm and wrist 1 and is in the shape of an isosceles trapezoid. The variable cross-section connection end 21 is integrally formed and connected to the boom body 2.

[0032] The wider the root of the boom, the longer the weld. Under the same load, the stress and load on the weld at the root of the boom per unit area are smaller, thus reducing the risk of cracking of the weld and plates and improving the service life. Therefore, a variable cross-section structure is adopted in the structural design at the connection between the arm and wrist 1 and the boom body 2.

[0033] In an alternative embodiment, as Figures 1 to 5 shown, the boom body 2 includes two webs 22 and two cover plates 23. One end of each web 22 connected to the arm and wrist 1 is bent and extended to form a first variable cross-section section 221. Each cover plate 23 is provided with a second variable cross-section section 231 corresponding to the variable cross-section section, and the width of the second variable cross-section section 231 gradually increases in the direction towards the arm and wrist 1. The two webs 22 are arranged opposite to each other and the two cover plates 23 enclose to form the boom body 2 and the variable cross-section connection end 21. The method of integrally formed bending can reduce the number of welds. The first variable cross-section section 221 and the second variable cross-section section 231 enclose to form the variable cross-section connection end 21. Further, the range of the bending angle a of each web is 172° - 176°. In this embodiment, the value of the angle a is selected as 175°, which widens the boom body 2, increases the connection area with the arm and wrist 1 while ensuring the light weight of the boom body, and improves the connection strength between the two.

[0034] In an alternative embodiment, as Figure 5 shown, a relief groove 211 is provided at one end of the variable cross-section connecting end 21 connected to the arm wrist 1, and the relief groove 211 is used for the web 22 to be adhesively connected to the arm wrist 1. Specifically, a relief groove 211 is provided at one end of the first variable cross-section segment 221 connected to the arm wrist 1, so that the variable cross-section connecting end 21 is adhesively connected to the arm wrist 1, the contact surface is increased, the welding surface is large, and the connection strength between the two is improved.

[0035] In an alternative embodiment, as Figure 5 shown, two reinforcing plates 4 are provided on the variable cross-section connecting end 21, and the two reinforcing plates 4 are connected to the inner wall of the variable cross-section connecting end 21 and the side of the arm wrist 1 facing the variable cross-section connecting end 21, and the two reinforcing plates 4 are arranged at an angle. Specifically, the reinforcing plate 4 is used to strengthen the connection strength between the first variable cross-section segment 221 and the second variable cross-section segment 231.

[0036] In an alternative embodiment, as Figure 1 、 Figure 2 and Figure 5 shown, the web 22 is provided with a first attaching plate 5 and a second attaching plate 6. The first attaching plate 5 is arranged on the outer surface of the web 22 near one end of the arm head 3, and the second attaching plate 6 is arranged on the outer surface of the middle of the web 22. The variable cross-section connecting end 21 is provided with a third attaching plate 10, and the third attaching plate 10 is arranged on the surfaces of the first variable cross-section segment 221 and the second variable cross-section segment 231. Specifically, the edges of the first attaching plate 5, the second attaching plate 6 and the third attaching plate 10 are designed to be arc-shaped. The arc transition weld extends the length of the weld, further reduces the weld stress, strengthens the overall strength of the variable cross-section boom, extends the service life, reduces the safety risk, and at the same time increases the arc edge to improve the overall structural beauty.

[0037] In an alternative embodiment, as Figure 3 shown, the boom body 2 is provided with a first partition plate 7, and the first partition plate 7 is arranged inside the boom body 2. Specifically, the two webs 22 are spaced apart by a set distance through the first partition plate 7, so as to improve the stability between the two, and at the same time improve the overall strength of the variable cross-section boom.

[0038] In an alternative embodiment, as Figure 6As shown, the boom head 3 is provided with a connection end 8. The connection end 8 is arranged at one end of the boom head 3 away from the boom body 2. The connection end 8 is connected to the dipper arm of the excavator by a pin for position limitation. Specifically, the connection end 8 includes two connecting plates 81, a mating backing plate 82, a lining plate 83, a head plate 84 and a second partition plate 85. The connection end 8 is formed by welding the above components correspondingly. The two connecting plates 81 are arranged oppositely. One end of each of the two connecting plates 81 is connected to the boom head 3. At the same time, the second partition plate 85 and the head plate 84 are welded between the two connecting plates 81. A lining plate 83 is arranged on the inner side of the other end of the two connecting plates 81. The lining plate 83 is arranged in a fitting manner with the connecting plate 81. The connecting plate 81 and the lining plate 83 are both provided with through holes 86, which correspond to each other. The mating backing plate 82 is arranged in a fitting manner between the lining plate 83 and the sealing plate. Further, a pin position-limiting U-shaped plate 87 is arranged on the outer side of each connecting plate 81. The pin position-limiting U-shaped plate 87 is arranged on the periphery of the through hole 86, which is used to limit the rotation of the connecting pin between the variable-section boom and the connecting arm of the excavation assembly, reduce wear, and improve the service life of the connecting pin and the variable-section boom.

[0039] In an alternative embodiment, as Figures 1 to 5 shown, the variable-section boom is provided with a support portion 9. The support portion 9 is connected to the excavation assembly by a pin. Specifically, by arranging the support portion 9 to install the driving component of the excavation assembly, the excavation assembly can move relative to the variable-section boom under the action of the driving component.

[0040] Further, the boom wrist 1 is composed of a connecting sleeve, a steel sleeve and a sealing ring. The steel sleeve and the sealing ring are assembled in the connecting sleeve. The boom wrist 1 is hinged to the slewing platform by a pin, and the variable-section boom can be rotated through the slewing platform. Further, the interference tolerance of the fit between the steel sleeve and the connecting sleeve is controlled between 0.2 mm and 0.25 mm, which solves the problem of loosening and sliding of the steel sleeve and extends the service life of the variable-section boom.

[0041] In a second aspect of the present utility model, a wheeled excavator is provided, which includes the above variable-section boom, a slewing platform, a traveling structure and an excavation structure. The variable-section boom is movably connected to the slewing platform through the boom wrist 1. The slewing platform is used to rotate the variable-section boom. The variable-section boom is movably connected to the excavation structure through the boom head 3.

[0042] In summary, by bending to widen the spacing between the ends of the two webs 22 facing the arm wrist 1, a variable cross-section connection end 21 with a gradually increasing width is formed at the end of the arm body 2, making the variable cross-section connection end 21 in the shape of an isosceles trapezoid. The longer the weld between the variable cross-section connection end 21 and the arm wrist 1, the smaller the stress and load per unit area on the weld at the arm wrist 1 when the variable cross-section boom is subjected to the same load. On the premise of ensuring strength, the risk of weld and plate cracking is reduced, the torque-bearing capacity of the arm wrist 1 of the variable cross-section boom is improved, the connection stability and strength are enhanced, the service life is prolonged, and the safety risk is reduced.

[0043] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as limitations on the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0044] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable cross-section boom, applied to an excavator, characterized in that, It includes an arm wrist, an arm body and an arm head; One end of the arm body is connected to the arm head. The arm wrist is used to connect the variable cross-section boom to the slewing platform of the excavator. The arm head is used to connect the excavation component of the excavator. A variable cross-section connection end is provided at one end of the arm body away from the arm head, and the variable cross-section connection end is connected to the arm wrist. Part of the arm wrist protrudes from the variable cross-section connection end; The width of the variable cross-section connection end gradually increases in the direction towards the arm wrist and is in the shape of an isosceles trapezoid. The variable cross-section connection end is integrally formed and connected to the arm body.

2. The variable cross-section boom according to claim 1, wherein, The arm body includes two webs and two cover plates. One end of each web connected to the arm wrist is bent and extended to form a first variable cross-section section. Each cover plate is provided with a second variable cross-section section corresponding to the variable cross-section section, and the width of the second variable cross-section section gradually increases in the direction towards the arm wrist. The two webs are arranged oppositely and the two cover plates enclose to form the arm body and the variable cross-section connection end.

3. The variable cross-section boom according to claim 2, wherein A relief groove is provided at one end of the variable cross-section connection end connected to the arm wrist, and the relief groove is used for the web to be fitted and connected to the arm wrist.

4. The variable cross-section boom according to claim 2, wherein The web is provided with a first patch plate and a second patch plate. The first patch plate is arranged on the outer surface of the web near the arm head end, and the second patch plate is arranged on the outer surface of the middle part of the web.

5. The variable cross-section boom according to claim 2, characterized in that, The variable cross-section connection end is provided with a third patch plate, and the third patch plate is arranged on the surfaces of the first variable cross-section section and the second variable cross-section section.

6. The variable cross-section boom according to claim 1, characterized in that, Two reinforcing plates are provided at the variable cross-section connection end. The two reinforcing plates are connected to the inner wall of the variable cross-section connection end and the side of the arm wrist facing the variable cross-section connection end, and an included angle is formed between the two reinforcing plates.

7. The variable cross-section boom according to claim 1, characterized in that, A first partition plate is provided in the arm body, and the first partition plate is arranged inside the arm body.

8. The variable cross-section boom according to claim 1, characterized in that, The arm head is provided with a connection end. The connection end is arranged at one end of the arm head away from the arm body, and the connection end is limitedly connected to the bucket rod of the excavator through a pin shaft.

9. The variable cross-section boom according to claim 1, wherein The variable cross-section boom is provided with a support part, and the support part is pivotally connected to the excavation component through a pin shaft.

10. A wheeled excavator, characterized in that, It includes the variable cross-section boom, the slewing platform, the traveling structure and the excavation structure according to any one of claims 1 to 9. The variable cross-section boom is movably connected to the slewing platform through the arm wrist. The slewing platform is used to rotate the variable cross-section boom. The variable cross-section boom is movably connected to the excavation structure through the arm head.

Images