Excavator boom and arm design method

Abstract

The invention relates to the field of engineering machinery, and discloses an excavator boom and boom design method, wherein the excavator boom comprises a boom body and a front support and a rear support, the boom body comprises an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate both comprise a front straight section and a rear straight section respectively connected to the front support and the rear support, the side profile of the front support is an axisymmetric structure and has a symmetry axis L1 passing through the center point A of its hinge hole, the side profile line of the front straight section of the upper cover plate and the side profile line of the front straight section of the lower cover plate are respectively symmetric relative to the symmetry axis L1, the side profile of the rear support is an axisymmetric structure and has a symmetry axis L2 passing through the center point B of its hinge hole, the side profile line of the rear straight section of the upper cover plate and the side profile line of the rear straight section of the lower cover plate are respectively symmetric relative to the symmetry axis L2. The invention effectively reduces the design difficulty of the excavator boom, shortens the design cycle, and at the same time, greatly reduces the difficulty of processing and manufacturing, and reduces the manufacturing cost.

Description

Technical Field

[0001] The present invention belongs to the field of engineering machinery, and in particular, relates to an excavator boom and a boom design method of the excavator boom. Background Art

[0002] The excavator boom is the key action execution component of the excavator, and is mainly composed of a boom body, a plurality of supports arranged on the boom body, and an ear plate arranged on the boom body, wherein the boom body mainly includes an upper cover plate, a lower cover plate, a front web plate, a middle web plate, and a rear web plate, and the front web plate, the middle web plate, and the rear web plate are sequentially connected between the upper cover plate and the lower cover plate along the direction from the front end to the rear end of the boom body, and the plurality of supports mainly include a front support arranged at the front end of the boom body, a middle support arranged on the middle web plate, and a rear support arranged at the rear end of the boom body.

[0003] In the existing related technologies, the overall structure of the excavator boom is irregular and relatively complex. In the structural design of the excavator boom, the positioning of each part of the structure is complex and difficult to determine quickly. The design process is relatively complicated and cumbersome, the development cycle is long, the reliability evaluation is difficult, and the processing and manufacturing are difficult and costly. Summary of the invention

[0004] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides an excavator boom and a boom design method, aiming to solve the technical problems in the prior art that the structural design process of the excavator boom is relatively complicated and cumbersome, the development cycle is long, the reliability evaluation is difficult, and the processing and manufacturing are difficult and the cost is high.

[0005] To achieve the above-mentioned purpose, the present invention provides an excavator boom, including a boom body and a front support and a rear support respectively arranged at the front and rear ends of the boom body, the boom body including an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate both including a front straight section and a rear straight section respectively connected to the front support and the rear support, the side profile of the front support is an axisymmetric structure and has a symmetry axis L1 passing through the center point A of its hinge hole, the side profile line of the front straight section of the upper cover plate and the side profile line of the front straight section of the lower cover plate are respectively symmetrical relative to the symmetry axis L1, the side profile of the rear support is an axisymmetric structure and has a symmetry axis L2 passing through the center point B of its hinge hole, the side profile line of the rear straight section of the upper cover plate and the side profile line of the rear straight section of the lower cover plate are respectively symmetrical relative to the symmetry axis L2.

[0006] Optionally, the angle between the line AB between the hinge hole center point A and the hinge hole center point B and the symmetry axis L1 is 15° to 20°, and the angle between the line AB and the symmetry axis L2 is 25° to 30°.

[0007] Optionally, the straight line L3 where the side contour line of the front straight section of the upper cover plate is located and the straight line L4 where the side contour line of the front straight section of the lower cover plate is located are respectively at a distance from the center point A of the hinge hole of h1, the diameter of the hinge hole of the front support is d1, and h1 and d1 satisfy the relationship: 1.2≤h1 / d1≤1.8.

[0008] Optionally, the straight line L5 where the side contour line of the rear straight section of the upper cover plate is located and the straight line L6 where the side contour line of the rear straight section of the lower cover plate is located are respectively at a distance from the center point B of the hinge hole of h2, the diameter of the hinge hole of the rear support is d2, and h2 and d2 satisfy the relationship: 0.8≤h2 / d2≤1.2.

[0009] Optionally, the front support comprises a middle curved plate and two connecting side plates with hinge holes, the top and bottom of the middle curved plate are respectively connected to the front straight section of the upper cover plate and the front straight section of the lower cover plate, and the two connecting side plates are respectively and symmetrically welded to the lateral sides of the middle curved plate; and / or,

[0010] The rear support includes a middle steel pipe and two connecting pieces, the two connecting pieces are symmetrically welded to the two lateral ends of the middle steel pipe, and the tops and bottoms of the two connecting pieces are respectively connected to the front straight section of the upper cover plate and the front straight section of the lower cover plate.

[0011] Optionally, the boom body also includes a front belly plate and a middle belly plate connected between the upper cover plate and the lower cover plate, the front end of the front belly plate is connected to the rear end of the front support, and the rear end of the front belly plate is connected to the front end of the middle belly plate, wherein the edge intersection line between the front end of the front belly plate and the rear end of the front support is perpendicular to the symmetry axis L1, and the edge intersection line between the rear end of the front belly plate and the front end of the middle belly plate is perpendicular to the symmetry axis L1.

[0012] Optionally, the boom body also includes a rear belly plate connected between the upper cover plate and the lower cover plate, the front end of the rear belly plate is connected to the rear end of the middle belly plate, and the rear end of the rear belly plate is connected to the front end of the rear support, wherein the edge intersection line between the front end of the rear belly plate and the rear end of the middle belly plate is perpendicular to the symmetry axis L2, and the edge intersection line between the rear end of the rear belly plate and the front end of the rear support is perpendicular to the symmetry axis L2.

[0013] In the excavator boom provided by the present invention, the side contour of the front support and the side contour line of the front straight section of the upper cover plate and the side contour line of the front straight section of the lower cover plate are symmetrical relative to the symmetry axis L1. At the same time, the side contour of the rear support and the side contour line of the rear straight section of the upper cover plate and the side contour line of the rear straight section of the lower cover plate are symmetrical relative to the symmetry axis L2. In this way, the overall structure of the excavator boom is relatively regular and simple. When designing the structure of the excavator boom, the various component structures of the excavator boom can be quickly positioned using the symmetry axis L1 and the symmetry axis L2 as reference lines, which effectively reduces the design difficulty, shortens the design cycle, and facilitates reliability evaluation. At the same time, the difficulty of processing and manufacturing is greatly reduced, and the manufacturing cost is reduced. In addition, the reliability and structural strength of the excavator boom are greatly improved.

[0014] The present invention also provides a boom design method for the above-mentioned excavator boom, comprising the following steps:

[0015] Based on the hinge hole center point A and the hinge hole center point B, the symmetry axis L1 and the symmetry axis L2 are drawn;

[0016] Based on the symmetry axis L1, determine the side contour line of the front straight section of the upper cover plate and the side contour line of the front straight section of the lower cover plate;

[0017] Based on the symmetry axis L2, a side contour line of the rear straight section of the upper cover plate and a side contour line of the rear straight section of the lower cover plate are determined.

[0018] Optionally, the step of making the symmetry axis L1 and the symmetry axis L2 based on the hinge hole center point A and the hinge hole center point B comprises:

[0019] The center point A of the hinge hole and the center point B of the hinge hole are connected to form a line AB, and the symmetry axis L1 is made through the center point A of the hinge hole with an angle of a1 to the line AB, and the symmetry axis L2 is made through the center point B of the hinge hole with an angle of a2 to the line AB, wherein a1 satisfies: 15°≤a1≤20°, and a2 satisfies: 25°≤a2≤30°.

[0020] Optionally, the step of determining the side contour line of the front straight section of the upper cover plate and the side contour line of the front straight section of the lower cover plate based on the symmetry axis L1 comprises:

[0021] Draw two straight lines L3 and L4 which are symmetrical with respect to the symmetry axis L1, have an angle of a3 with the symmetry axis L1 and are at a distance of h1 from the center point A of the hinge hole, wherein the straight line L3 is located above the symmetry axis L1, and the straight line L4 is located below the symmetry axis L1, the side contour line of the front straight section of the upper cover plate is located on the straight line L3, and the side contour line of the front straight section of the lower cover plate is located on the straight line L4, the diameter of the hinge hole of the front support is d1, and the h1 and d1 satisfy the relationship: 1.2≤h1 / d1≤1.8.

[0022] Optionally, the step of determining the side contour line of the rear straight section of the upper cover plate and the side contour line of the rear straight section of the lower cover plate according to the symmetry axis L2 comprises:

[0023] Draw two straight lines L5 and L6 which are symmetrical with respect to the symmetry axis L2, have an angle a4 with the symmetry axis L2 and are at a distance h2 from the center point B of the hinge hole, wherein the straight line L5 is located above the symmetry axis L2, the straight line L6 is located below the symmetry axis L2, the side contour line of the rear straight section of the upper cover plate is located on the straight line L5, the side contour line of the rear straight section of the lower cover plate is located on the straight line L6, the diameter of the hinge hole of the rear support is d2, and the h2 and d2 satisfy the relationship: 0.8≤h2 / d2≤1.2.

[0024] Optionally, the boom body further includes a front web and a middle web connected between the upper cover plate and the lower cover plate, the front end of the front web is connected to the rear end of the front support, and the rear end of the front web is connected to the front end of the middle web, wherein an edge intersection line between the front end of the front web and the rear end of the front support is perpendicular to the symmetry axis L1, and an edge intersection line between the rear end of the front web and the front end of the middle web is perpendicular to the symmetry axis L1, and the boom design method further includes the following steps:

[0025] A first intersection reference line is made perpendicular to the symmetry axis L1 and at a distance h3 from the center point A of the hinge hole. The first intersection reference line has an intersection point C with the side contour line of the front straight section of the upper cover plate, and has an intersection point D with the side contour line of the front straight section of the lower cover plate. A line CD connecting the intersection point C and the intersection point D is an edge intersection line between the front end of the front web plate and the rear end of the front support.

[0026] A second intersection reference line is made perpendicular to the symmetry axis L1 and at a distance h4 from the center point A of the hinge hole. The second intersection reference line has an intersection E with the side contour line of the front straight section of the upper cover plate, and has an intersection F with the side contour line of the front straight section of the lower cover plate. The line EF connecting the intersection point E and the intersection point F is the edge intersection line between the rear end of the front web and the front end of the middle web, wherein h4 and h3 satisfy the relationship: h4>h3.

[0027] Optionally, the boom body further includes a rear web connected between the upper cover plate and the lower cover plate, the front end of the rear web is connected to the rear end of the middle web, and the rear end of the rear web is connected to the front end of the rear support, wherein an edge intersection line between the front end of the rear web and the rear end of the middle web is perpendicular to the symmetry axis L2, and an edge intersection line between the rear end of the rear web and the front end of the rear support is perpendicular to the symmetry axis L2, and the boom design method further includes the following steps:

[0028] A third intersection reference line is made perpendicular to the symmetry axis L2 and at a distance h5 from the center point B of the hinge hole. The third intersection reference line has an intersection point G with the side contour line of the rear straight section of the upper cover plate, and has an intersection point H with the side contour line of the rear straight section of the lower cover plate. The line GH connecting the intersection point G and the intersection point H is the edge intersection line between the rear end of the rear web and the front end of the rear support.

[0029] A fourth intersection reference line is made perpendicular to the symmetry axis L2 and at a distance h6 from the center point B of the hinge hole. The fourth intersection reference line has an intersection I with the side contour line of the rear straight section of the upper cover plate, and has an intersection J with the side contour line of the rear straight section of the lower cover plate. The line IJ connecting the intersection I and the intersection J is the edge intersection line between the front end of the rear web and the rear end of the middle web, wherein h6 and h5 satisfy the relationship: h6>h5.

[0030] In the boom design method provided by the present invention, the symmetry axis L1 can be quickly determined based on the center points A and a1 of the hinge holes, and the symmetry axis L2 can be quickly determined based on the center points B and a2 of the hinge holes. The side contour lines of the front straight section of the upper cover plate and the side contour lines of the front straight section of the lower cover plate can be quickly determined through the symmetry axis L1, and the side contour lines of the rear straight section of the upper cover plate and the side contour lines of the rear straight section of the lower cover plate can be quickly determined through the symmetry axis L2. In this way, the side contour line of the excavator boom can be quickly determined, the design process can be simplified, the design efficiency can be improved, and the development cycle can be greatly shortened.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 It is a structural schematic diagram of an excavator boom in one embodiment of the present invention;

[0034] Figure 2 for Figure 1 A schematic diagram of the structure of the front support in FIG.

[0035] Figure 3 for Figure 1 Schematic diagram of the structure of the rear support.

[0036] Description of reference numerals:

[0037] 1 front support

[0038] 11 Middle curved plate 12 Connecting side plate

[0039] 2 Rear support

[0040] 21 Intermediate steel pipe 22 Connecting piece

[0041] 3 Upper cover

[0042] 4 Lower cover

[0043] 5 Front belly plate

[0044] 6 mid web

[0045] 7 Metastomy DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0048] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.

[0049] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0050] The present invention first provides an excavator boom.

[0051] See attached Figure 1 To Attachment Figure 3 As shown, in one embodiment, the excavator boom includes a boom body and a front support 1 and a rear support 2 respectively arranged at the front and rear ends of the boom body, the boom body includes an upper cover plate 3 and a lower cover plate 4, the upper cover plate 3 and the lower cover plate 4 both include a front straight section and a rear straight section respectively connected to the front support 1 and the rear support 2, the side profile of the front support 1 is an axisymmetric structure and has a symmetry axis L1 passing through the center point A of its hinge hole, the side profile line of the front straight section of the upper cover plate 3 and the side profile line of the front straight section of the lower cover plate 4 are respectively symmetrical relative to the symmetry axis L1, the side profile of the rear support 2 is an axisymmetric structure and has a symmetry axis L2 passing through the center point B of its hinge hole, the side profile line of the rear straight section of the upper cover plate 3 and the side profile line of the rear straight section of the lower cover plate 4 are respectively symmetrical relative to the symmetry axis L2.

[0052] It can be understood that in the present embodiment, the side profile of the front support 1 and the side contour lines of the front straight section of the upper cover plate 3 and the side contour lines of the front straight section of the lower cover plate 4 are symmetrical relative to the symmetry axis L1. At the same time, the side profile of the rear support 2 and the side contour lines of the rear straight section of the upper cover plate 3 and the side contour lines of the rear straight section of the lower cover plate 4 are symmetrical relative to the symmetry axis L2. In this way, the overall structure of the excavator boom is relatively regular and simple. When designing the structure of the excavator boom, the various component structures of the excavator boom can be quickly positioned using the symmetry axis L1 and the symmetry axis L2 as reference lines, which effectively reduces the design difficulty, shortens the design cycle, and facilitates reliability evaluation. At the same time, the difficulty of processing and manufacturing is greatly reduced, and the manufacturing cost is reduced. In addition, the reliability and structural strength of the excavator boom are greatly improved.

[0053] In one embodiment, the angle between the line AB between the center point A of the hinge hole and the center point B of the hinge hole and the symmetry axis L1 is 15°~20°, and the angle between the line AB and the symmetry axis L2 is 25°~30°. In this way, when designing the structure of the excavator boom, after the relative positions of the center points A of the hinge hole and B of the hinge hole are determined, the specific angle parameters of the angles between the line AB and the symmetry axis L1 and the symmetry axis L2 are directly selected within the above-mentioned angle range, and the symmetry axis L1 and the symmetry axis L2 are quickly determined, and the designed excavator boom has good structural strength.

[0054] In one embodiment, the straight line L3 where the side contour line of the front straight section of the upper cover plate 3 is located and the straight line L4 where the side contour line of the front straight section of the lower cover plate 4 is located are both at a distance from the center point A of the hinge hole h1, the diameter of the hinge hole of the front support 1 is d1, and h1 and d1 satisfy the relationship: 1.2≤h1 / d1≤1.8. With such an arrangement, when designing the structure of the excavator boom, the positions of the straight line L3 and the straight line L4 can be quickly determined through the hinge hole of the front support 1, and then the positions of the side contour lines of the front straight section of the upper cover plate 3 and the side contour lines of the front straight section of the lower cover plate 4 can be quickly determined, and the designed excavator boom has good structural strength.

[0055] In one embodiment, the straight line L5 where the side contour line of the rear straight section of the upper cover plate 3 is located and the straight line L6 where the side contour line of the rear straight section of the lower cover plate 4 is located are both at a distance from the center point B of the hinge hole h2, the diameter of the hinge hole of the rear support 2 is d2, and h2 and d2 satisfy the relationship: 0.8≤h2 / d2≤1.2. With such an arrangement, when designing the structure of the excavator boom, the positions of the straight line L5 and the straight line L6 can be quickly determined through the hinge hole of the rear support 2, and then the positions of the side contour lines of the rear straight section of the upper cover plate 3 and the side contour lines of the rear straight section of the lower cover plate 4 can be quickly determined, and the designed excavator boom has good structural strength.

[0056] In one embodiment, referring to Figure 2 As shown, the front support 1 includes a middle bent plate 11 and two connecting side plates 12 with hinge holes. The top and bottom of the middle bent plate 11 are respectively connected to the front straight section of the upper cover plate 3 and the front straight section of the lower cover plate 4. The two connecting side plates 12 are symmetrically welded to the lateral sides of the middle bent plate 11. This arrangement makes the front support 1 have a symmetrical structure on both sides in the left and right directions of the boom body. The structure is simple and regular, which is convenient for design and manufacturing.

[0057] It can be understood that the width dimension of the front support 1 in the left-right direction of the boom body is determined by the length dimension of the middle bent plate 11. During the design and manufacturing process, the width dimension of the front support 1 can be made to meet the specification requirements of the excavator boom by selecting the length dimension of the middle bent plate 11. In this way, the design process of the front support 1 is effectively simplified, making the front support 1 suitable for excavator booms of various specifications. In addition, the structural strength of the front support 1 is also greatly improved.

[0058] In one embodiment, referring to Figure 3As shown, the rear support 2 includes a middle steel pipe 21 and two connecting parts 22. The two connecting parts 22 are symmetrically welded to the two lateral ends of the middle steel pipe 21. The top and bottom of the two connecting parts 22 are respectively connected to the front straight section of the upper cover plate 3 and the front straight section of the lower cover plate 4. This arrangement makes the rear support 2 have a symmetrical structure on both sides in the left and right directions of the boom body. The structure is simple and regular, which is easy to design and manufacture.

[0059] It can be understood that the width dimension of the rear support 2 in the left-right direction of the boom body is determined by the length dimension of the intermediate steel pipe 21. During the design and manufacturing process, the width dimension of the rear support 2 can be made to meet the specification requirements of the excavator boom by selecting the length dimension of the intermediate steel pipe 21. In this way, the design process of the rear support 2 is effectively simplified, making the rear support 2 suitable for excavator booms of various specifications. In addition, the structural strength of the rear support 2 is also greatly improved.

[0060] In one embodiment, the boom body also includes a front belly plate 5 and a middle belly plate 6 connected between the upper cover plate 3 and the lower cover plate 4, the front end of the front belly plate 5 is connected to the rear end of the front support 1, and the rear end of the front belly plate 5 is connected to the front end of the middle belly plate 6, wherein the edge intersection line between the front end of the front belly plate 5 and the rear end of the front support 1 is perpendicular to the symmetry axis L1, and the edge intersection line between the rear end of the front belly plate 5 and the front end of the middle belly plate 6 is perpendicular to the symmetry axis L1.

[0061] In this way, when designing the structure of the excavator boom, the connection between the front support 1, the front web 5 and the middle web 6 can be quickly positioned based on the symmetry axis L1.

[0062] Furthermore, between the upper cover plate 1 and the lower cover plate 2, a front belly plate 5 is respectively provided on the left and right sides of the boom body. Since the front end edge contour line and the rear end edge contour line of the front belly plate 5 are perpendicular to the symmetry axis L1, the two front belly plates 5 on the left and right sides of the excavator boom can be interchangeable, thereby effectively reducing the difficulty of processing and manufacturing the excavator boom.

[0063] In one embodiment, the boom body also includes a rear belly plate 7 connected between the upper cover plate 3 and the lower cover plate 4, the front end of the rear belly plate 7 is connected to the rear end of the middle belly plate 6, and the rear end of the rear belly plate 7 is connected to the front end of the rear support 2, wherein the edge intersection line between the front end of the rear belly plate 7 and the rear end of the middle belly plate 6 is perpendicular to the symmetry axis L2, and the edge intersection line between the rear end of the rear belly plate 7 and the front end of the rear support 2 is perpendicular to the symmetry axis L2.

[0064] In this way, when designing the structure of the excavator boom, the connection between the center web 6, the rear web 7 and the rear support 2 can be quickly positioned based on the symmetry axis L2.

[0065] Furthermore, between the upper cover plate 1 and the lower cover plate 2, a rear belly plate 7 is respectively provided on the left and right sides of the boom body. Since the front edge contour line and the rear edge contour line of the rear belly plate 7 are perpendicular to the symmetry axis L2, the two rear belly plates 7 on the left and right sides of the excavator boom can be interchangeable, thereby effectively reducing the difficulty of processing and manufacturing the excavator boom.

[0066] The present invention also provides a boom design method for an excavator boom, and the specific structure of the excavator boom refers to the above-mentioned embodiment.

[0067] In one embodiment, the boom design method includes the following steps:

[0068] Based on the hinge hole center point A and hinge hole center point B, draw the symmetry axis L1 and the symmetry axis L2;

[0069] Based on the symmetry axis L1, determine the side contour line of the front straight section of the upper cover plate 3 and the side contour line of the front straight section of the lower cover plate 4;

[0070] Based on the symmetry axis L2, the side contour line of the rear straight section of the upper cover plate 3 and the side contour line of the rear straight section of the lower cover plate 4 are determined.

[0071] It can be understood that in this embodiment, the symmetry axis L1 can be quickly determined based on the center points A and a1 of the hinge holes, and the symmetry axis L2 can be quickly determined based on the center points B and a2 of the hinge holes. The side contour lines of the front straight section of the upper cover plate 3 and the side contour lines of the front straight section of the lower cover plate 4 can be quickly determined through the symmetry axis L1, and the side contour lines of the rear straight section of the upper cover plate 3 and the side contour lines of the rear straight section of the lower cover plate 4 can be quickly determined through the symmetry axis L2. In this way, based on the symmetry axis L1 and the symmetry axis L2, the side contour line of the excavator boom can be quickly determined, which simplifies the design process, improves design efficiency, and greatly shortens the development cycle.

[0072] In this embodiment, the steps of making the symmetry axis L1 and the symmetry axis L2 based on the hinge hole center point A and the hinge hole center point B include:

[0073] Connect the center point A of the hinge hole and the center point B of the hinge hole to form a line AB, make a symmetry axis L1 through the center point A of the hinge hole with an angle of a1 to the line AB, make a symmetry axis L2 through the center point B of the hinge hole with an angle of a2 to the line AB, a1 satisfies: 15°≤a1≤20°, a2 satisfies: 25°≤a2≤30°.

[0074] In the actual design process, the specific value of a1 can be selected within the range of 15° to 20°, and the specific value of a2 can be selected within the range of 25° to 30° based on experience, so as to achieve rapid positioning of the symmetry axis L1 and the symmetry axis L2.

[0075] In this embodiment, based on the symmetry axis L1, the step of determining the side contour line of the front straight section of the upper cover plate 3 and the side contour line of the front straight section of the lower cover plate 4 includes:

[0076] Draw two straight lines L3 and L4 which are symmetrical with respect to the symmetry axis L1, have an angle of a3 with the symmetry axis L1 and are at a distance of h1 from the center point A of the hinge hole, wherein the straight line L3 is located above the symmetry axis L1, the straight line L4 is located below the symmetry axis L1, the side contour line of the front straight section of the upper cover plate 3 is located on the straight line L3, the side contour line of the front straight section of the lower cover plate 4 is located on the straight line L4, the diameter of the hinge hole of the front support 1 is d1, and h1 and d1 satisfy the relationship: 1.2≤h1 / d1≤1.8.

[0077] In the actual design process, the specific value of a3 can be selected based on experience and the specific ratio of h1 / d1 can be selected within the above range. When d1 is determined, h1 can be quickly determined. The positions of straight lines L3 and L4 can be determined based on h1 and a3. After the position of the side contour line of the front straight section of the upper cover plate 3 is determined by straight line L3, the length of the front straight section of the upper cover plate 3 is selected based on experience and the starting point of the side contour line of the front straight section of the upper cover plate 3 is selected at the front support 1. In this way, the side contour line of the front straight section of the upper cover plate 3 can be determined. Similarly, after the position of the side contour line of the front straight section of the lower cover plate 4 is determined by straight line L4, the length of the front straight section of the lower cover plate 4 is selected based on experience and the starting point of the side contour line of the front straight section of the lower cover plate 4 is selected at the front support 1. In this way, the side contour line of the front straight section of the lower cover plate 4 can be determined.

[0078] In this embodiment, the step of determining the side contour line of the rear straight section of the upper cover plate 3 and the side contour line of the rear straight section of the lower cover plate 4 according to the symmetry axis L2 includes:

[0079] Draw two straight lines L5 and L6 which are symmetrical with respect to the symmetry axis L2, have an angle a4 with the symmetry axis L2 and are at a distance h2 from the center point B of the hinge hole, wherein the straight line L5 is located above the symmetry axis L2, the straight line L6 is located below the symmetry axis L2, the side contour line of the rear straight section of the upper cover plate 3 is located on the straight line L5, the side contour line of the rear straight section of the lower cover plate 4 is located on the straight line L6, the diameter of the hinge hole of the rear support 2 is d2, and h2 and d2 satisfy the relationship: 0.8≤h2 / d2≤1.2.

[0080] In the actual design process, the specific value of a4 can be selected based on experience and the specific ratio of h2 / d21 can be selected within the above range. When d2 is determined, h2 can be quickly determined. The positions of straight lines L5 and L6 can be determined based on h2 and a4. After the position of the side contour line of the rear straight section of the upper cover plate 3 is determined by straight line L5, the length of the rear straight section of the upper cover plate 3 is selected based on experience and the starting point of the side contour line of the rear straight section of the upper cover plate 3 is selected at the rear support 2. In this way, the side contour line of the rear straight section of the upper cover plate 3 can be determined. Similarly, after the position of the side contour line of the rear straight section of the lower cover plate 4 is determined by straight line L6, the length of the rear straight section of the lower cover plate 4 is selected based on experience and the starting point of the side contour line of the rear straight section of the lower cover plate 4 is selected at the rear support 2. In this way, the side contour line of the rear straight section of the lower cover plate 4 can be determined.

[0081] In the present embodiment, specifically, the distance between the center point A of the hinge hole and the center point B of the hinge hole is the length of the excavator boom. The required length of the excavator boom, the specifications of the front support 1 and the specifications of the rear support 2 are selected according to the specifications of the excavator to be assembled. After the selection, the distance and position between the center point A of the hinge hole and the center point B of the hinge hole, as well as the diameter d1 of the hinge hole of the front support 1 and the diameter d2 of the hinge hole of the rear support 2 can be determined. Then, according to the center point A of the hinge hole and the center point B of the hinge hole, the symmetry axis L1 and the symmetry axis L2 are located. According to the symmetry axis L1, the center point A of the hinge hole and the diameter d1, the side contour lines of the front straight sections of the upper cover plate 3 and the lower cover plate 4 are determined. According to the symmetry axis L2, the center point B of the hinge hole and the diameter d2, the side contour lines of the upper cover plate 3 and the lower cover plate 4 are determined. The side contour line of the rear straight section of the cover plate 4, and finally, determine the side contour line of the middle arc section of the upper cover plate 3 according to the side contour line of the front straight section and the side contour line of the rear straight section of the upper cover plate 3 (the diameter of the middle arc section of the upper cover plate 3 is selected according to experience), and then determine the side contour line of the middle arc section of the lower cover plate 4 according to the side contour line of the front straight section and the side contour line of the rear straight section of the lower cover plate 4 (the diameter of the middle arc section of the lower cover plate 4 is selected according to experience), in this way, the side outer contour line of the boom body of the excavator boom can be obtained, and then, the front support 1 and the rear support 2 determine their respective side outer contour lines according to their respective hinge hole apertures, in this way, the complete side contour line of the excavator boom can be obtained, and based on the complete side contour line of the excavator boom, the following can be drawn Figure 1 Excavator boom shown.

[0082] In one embodiment, the boom body further includes a front web 5 and a middle web 6 connected between the upper cover plate 3 and the lower cover plate 4, the front end of the front web 5 is connected to the rear end of the front support 1, and the rear end of the front web 5 is connected to the front end of the middle web 6, wherein the edge intersection line between the front end of the front web 5 and the rear end of the front support 1 is perpendicular to the symmetry axis L1, and the edge intersection line between the rear end of the front web 5 and the front end of the middle web 6 is perpendicular to the symmetry axis L1, and the boom design method further includes the following steps:

[0083] A first intersection reference line is made perpendicular to the symmetry axis L1 and at a distance h3 from the center point A of the hinge hole. The first intersection reference line has an intersection point C with the side contour line of the front straight section of the upper cover plate 3 and an intersection point D with the side contour line of the front straight section of the lower cover plate 4. The line CD connecting the intersection points C and D is the edge intersection line between the front end of the front web plate 5 and the rear end of the front support 1.

[0084] A second intersection reference line is made perpendicular to the symmetry axis L1 and at a distance h4 from the center point A of the hinge hole. The second intersection reference line has an intersection E with the side contour line of the front straight section of the upper cover plate 3, and has an intersection F with the side contour line of the front straight section of the lower cover plate 4. The line EF connecting the intersection points E and F is the edge intersection line between the rear end of the front web 5 and the front end of the middle web 6, wherein h4 and h3 satisfy the relationship: h4>h3.

[0085] It can be understood that the distance between the first intersection reference line and the second intersection reference line is the length of the front web 5. In the actual design process, the specific values ​​of h3 and h4 are selected based on experience, wherein h4 minus h3 is the length of the front web 5. The first intersection reference line and the second intersection reference line can be determined based on h3 and h4, and then the connection line CD and the connection line EF are determined. The connection line CD and the connection line EF are the edge intersection lines of the front web 5 with the front support 1 and the middle web 6, respectively.

[0086] In one embodiment, the boom body further includes a rear web 7 connected between the upper cover plate 3 and the lower cover plate 4, the front end of the rear web 7 is connected to the rear end of the middle web 6, and the rear end of the rear web 7 is connected to the front end of the rear support 2, wherein the edge intersection line between the front end of the rear web 7 and the rear end of the middle web 6 is perpendicular to the symmetry axis L2, and the edge intersection line between the rear end of the rear web 7 and the front end of the rear support 2 is perpendicular to the symmetry axis L2, and the boom design method further includes the following steps:

[0087] A third intersection reference line is made perpendicular to the symmetry axis L2 and at a distance h5 from the center point B of the hinge hole. The third intersection reference line has an intersection point G with the side contour line of the rear straight section of the upper cover plate 3 and an intersection point H with the side contour line of the rear straight section of the lower cover plate 4. The line GH connecting the intersection points G and H is the edge intersection line between the rear end of the rear web 7 and the front end of the rear support 2.

[0088] A fourth intersection reference line is made perpendicular to the symmetry axis L2 and at a distance h6 from the center point B of the hinge hole. The fourth intersection reference line has an intersection I with the side contour line of the rear straight section of the upper cover plate 3, and has an intersection J with the side contour line of the rear straight section of the lower cover plate 4. The line IJ connecting the intersection points I and J is the edge intersection line between the front end of the rear web 7 and the rear end of the middle web 6, wherein h6 and h5 satisfy the relationship: h6>h5.

[0089] It can be understood that the distance between the third intersection reference line and the fourth intersection reference line is the length of the rear web 7. In the actual design process, the specific values ​​of h5 and h6 are selected based on experience, wherein h6 minus h5 is the length of the rear web 7. The third intersection reference line and the fourth intersection reference line can be determined based on h5 and h6, and then the connecting line GH and the connecting line IJ are determined. The connecting line GH and the connecting line IJ are the edge intersection lines of the rear web 7 with the rear support 2 and the middle web 6, respectively.

[0090] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0091] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0092] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An excavator boom, comprising a boom body and a front support (1) and a rear support (2) respectively arranged at the front and rear ends of the boom body, the boom body comprising an upper cover plate (3) and a lower cover plate (4), the upper cover plate (3) and the lower cover plate (4) both comprising a front straight section and a rear straight section respectively connected to the front support (1) and the rear support (2), characterized in that: The side profile of the front support (1) is an axisymmetric structure and has a symmetry axis L1 passing through the center point A of its hinge hole. The side profile line of the front straight section of the upper cover plate (3) and the side profile line of the front straight section of the lower cover plate (4) are symmetrical relative to the symmetry axis L1. The side profile of the rear support (2) is an axisymmetric structure and has a symmetry axis L2 passing through the center point B of its hinge hole. The side profile line of the rear straight section of the upper cover plate (3) and the side profile line of the rear straight section of the lower cover plate (4) are symmetrical relative to the symmetry axis L2. The angle between the line AB between the center point A of the hinge hole and the center point B of the hinge hole and the symmetry axis L1 is 15° to 20°, and the angle between the line AB and the symmetry axis L2 is 25° to 30°. The straight line L3 on which the side contour line of the front straight section of the upper cover plate (3) is located and the straight line L4 on which the side contour line of the front straight section of the lower cover plate (4) is located are both at a distance h1 from the center point A of the hinge hole, the diameter of the hinge hole of the front support (1) is d1, and the relationship between h1 and d1 is: 1.2≤h1 / d1≤1.8; The straight line L5 on which the side contour line of the rear straight section of the upper cover plate (3) is located and the straight line L6 on which the side contour line of the rear straight section of the lower cover plate (4) is located are both at a distance h2 from the center point B of the hinge hole, and the diameter of the hinge hole of the rear support (2) is d2, and the relationship between h2 and d2 satisfies: 0.8≤h2 / d2≤1.

2.

2. The excavator boom according to claim 1, characterized in that: The front support (1) comprises a middle curved plate (11) and two connecting side plates (12) with hinge holes, the top and bottom of the middle curved plate (11) are respectively connected to the front straight section of the upper cover plate (3) and the front straight section of the lower cover plate (4), and the two connecting side plates (12) are respectively symmetrically welded to the lateral sides of the middle curved plate (11); and / or, The rear support (2) comprises a middle steel pipe (21) and two connecting pieces (22), wherein the two connecting pieces (22) are symmetrically welded to the two transverse ends of the middle steel pipe (21), and the top and bottom of the two connecting pieces (22) are respectively connected to the front straight section of the upper cover plate (3) and the front straight section of the lower cover plate (4).

3. The excavator boom according to claim 1, characterized in that: The boom body also includes a front web (5) and a middle web (6) connected between the upper cover plate (3) and the lower cover plate (4), wherein the front end of the front web (5) is connected to the rear end of the front support (1), and the rear end of the front web (5) is connected to the front end of the middle web (6), wherein the edge intersection line between the front end of the front web (5) and the rear end of the front support (1) is perpendicular to the symmetry axis L1, and the edge intersection line between the rear end of the front web (5) and the front end of the middle web (6) is perpendicular to the symmetry axis L1.

4. The excavator boom according to claim 3, characterized in that: The boom body also includes a rear belly plate (7) connected between the upper cover plate (3) and the lower cover plate (4), the front end of the rear belly plate (7) is connected to the rear end of the middle belly plate (6), and the rear end of the rear belly plate (7) is connected to the front end of the rear support (2), wherein the edge intersection line between the front end of the rear belly plate (7) and the rear end of the middle belly plate (6) is perpendicular to the symmetry axis L2, and the edge intersection line between the rear end of the rear belly plate (7) and the front end of the rear support (2) is perpendicular to the symmetry axis L2.

5. A boom design method for an excavator boom according to claim 1, characterized in that: The following steps are involved: Connect the hinge hole center point A and the hinge hole center point B to form a line AB, make the symmetry axis L1 through the hinge hole center point A with an angle of a1 with the line AB, make the symmetry axis L2 through the hinge hole center point B with an angle of a2 with the line AB, a1 satisfies: 15°≤a1≤20°, a2 satisfies: 25°≤a2≤30°; Draw two straight lines L3 and L4, which are symmetrical to the symmetry axis L1, have an angle of a3 with the symmetry axis L1, and are at a distance of h1 from the center point A of the hinge hole, wherein the straight line L3 is located above the symmetry axis L1, and the straight line L4 is located below the symmetry axis L1, the side contour line of the front straight section of the upper cover plate (3) is located on the straight line L3, and the side contour line of the front straight section of the lower cover plate (4) is located on the straight line L4, the diameter of the hinge hole of the front support (1) is d1, and the relationship between h1 and d1 is: 1.2≤h1 / d1≤1.8; Draw two straight lines L5 and L6 which are symmetrical with respect to the symmetry axis L2, have an angle a4 with the symmetry axis L2 and are at a distance h2 from the center point B of the hinge hole, wherein the straight line L5 is located above the symmetry axis L2, and the straight line L6 is located below the symmetry axis L2, the side contour line of the rear straight section of the upper cover plate (3) is located on the straight line L5, and the side contour line of the rear straight section of the lower cover plate (4) is located on the straight line L6, the diameter of the hinge hole of the rear support (2) is d2, and the relationship between h2 and d2 is: 0.8≤h2 / d2≤1.

2.

6. The boom design method according to claim 5, characterized in that: The boom body further comprises a front web (5) and a middle web (6) connected between the upper cover plate (3) and the lower cover plate (4), the front end of the front web (5) being connected to the rear end of the front support (1), and the rear end of the front web (5) being connected to the front end of the middle web (6), wherein an edge intersection line between the front end of the front web (5) and the rear end of the front support (1) is perpendicular to the symmetry axis L1, and an edge intersection line between the rear end of the front web (5) and the front end of the middle web (6) is perpendicular to the symmetry axis L1, and the boom design method further comprises the following steps: A first intersection reference line is made perpendicular to the symmetry axis L1 and at a distance h3 from the center point A of the hinge hole. The first intersection reference line has an intersection point C with the side contour line of the front straight section of the upper cover plate (3), and has an intersection point D with the side contour line of the front straight section of the lower cover plate (4). A line CD connecting the intersection point C and the intersection point D is an edge intersection line between the front end of the front web plate (5) and the rear end of the front support (1); A second intersection reference line is made perpendicular to the symmetry axis L1 and at a distance h4 from the center point A of the hinge hole. The second intersection reference line has an intersection point E with the side contour line of the front straight section of the upper cover plate (3), and has an intersection point F with the side contour line of the front straight section of the lower cover plate (4). The line EF connecting the intersection point E and the intersection point F is the edge intersection line between the rear end of the front web plate (5) and the front end of the middle web plate (6), wherein h4 and h3 satisfy the relationship: h4>h3.

7. The boom design method according to claim 6, characterized in that: The boom body further comprises a rear web (7) connected between the upper cover plate (3) and the lower cover plate (4), the front end of the rear web (7) being connected to the rear end of the middle web (6), and the rear end of the rear web (7) being connected to the front end of the rear support (2), wherein an edge intersection line between the front end of the rear web (7) and the rear end of the middle web (6) is perpendicular to the symmetry axis L2, and an edge intersection line between the rear end of the rear web (7) and the front end of the rear support (2) is perpendicular to the symmetry axis L2, and the boom design method further comprises the following steps: A third intersection reference line is made perpendicular to the symmetry axis L2 and at a distance h5 from the center point B of the hinge hole. The third intersection reference line has an intersection point G with the side contour line of the rear straight section of the upper cover plate (3), and has an intersection point H with the side contour line of the rear straight section of the lower cover plate (4). The line GH connecting the intersection point G and the intersection point H is the edge intersection line between the rear end of the rear web plate (7) and the front end of the rear support (2); A fourth intersection reference line is made perpendicular to the symmetry axis L2 and at a distance h6 from the center point B of the hinge hole. The fourth intersection reference line has an intersection point I with the side contour line of the rear straight section of the upper cover plate (3), and has an intersection point J with the side contour line of the rear straight section of the lower cover plate (4). The line IJ connecting the intersection point I and the intersection point J is the edge intersection line between the front end of the rear web plate (7) and the rear end of the middle web plate (6), wherein h6 and h5 satisfy the relationship: h6>h5.

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