阅读说明：本技术 一种经济型挖掘机回转支承安装座及制造技术 (Economical excavator slewing bearing mounting seat and manufacturing technology ) 是由 李兆良 李永刚 王绪桥 庞朝利 房兴玉 叶桂友 于 2021-10-18 设计创作，主要内容包括：本发明公开了一种经济型挖掘机回转支承安装座及制造技术,包括座环、支撑环；所述支撑环上端面与座环下端面焊接在一起。所述座环通过三段弧形板首尾焊接而成。所述座环选用低合金高强结构钢Q345D材质。所述支撑环选用低合金高强结构钢Q345D材质,用卷板机卷制成圆环形,把圆环连接部位焊接而成。所述回转支承安装座的支撑环与中台架顶板焊接。本发明在不改变品质和性能前提下,安装座由锻造方式优化设计成多组件焊接方式。适应挖掘机价格跌落客观需求,以降低成本和保证生存利润。(The invention discloses an economical excavator slewing bearing mounting seat and a manufacturing technology thereof, comprising a seat ring and a support ring; the upper end face of the support ring is welded with the lower end face of the seat ring. The seat ring is formed by welding three sections of arc-shaped plates end to end. The seat ring is made of low-alloy high-strength structural steel Q345D. The support ring is made of low-alloy high-strength structural steel Q345D, is rolled into a circular ring shape by a plate rolling machine, and is formed by welding the connection part of the circular ring. And the support ring of the slewing bearing mounting seat is welded with the top plate of the middle rack. On the premise of not changing the quality and the performance, the mounting seat is optimally designed into a multi-component welding mode by a forging mode. The objective requirement of excavator price drop is met, so that the cost is reduced and the survival profit is guaranteed.)

1. An economical excavator slewing bearing mounting seat comprises a seat ring and a support ring;

the support ring is characterized in that the upper end face of the support ring is welded with the lower end face of the seat ring.

2. The economical excavator slewing bearing mounting base of claim 1, wherein the base ring is formed by welding three segments of arc-shaped plates end to end.

3. The economical excavator slewing bearing mounting base of claim 2, wherein the base ring is made of low-alloy high-strength structural steel Q345D.

4. The mounting base for the slewing bearing of the economical excavator as claimed in claim 1, wherein the support ring is made of low-alloy high-strength structural steel Q345D, is rolled into a circular ring shape by a plate rolling machine, and is formed by welding the connection part of the circular ring.

5. The economical excavator slewing bearing mounting base and manufacturing technique of claim 1, wherein the support ring of the slewing bearing mounting base is welded with the middle-platform top plate.

6. The manufacturing technology of the slewing bearing mounting seat of the economical excavator is characterized by comprising the following steps of:

the support ring is made of low-alloy high-strength structural steel Q345D, and is rolled by a plate rolling machine and welded to be formed;

the seat ring is made of low-alloy high-strength structural steel Q345D, blanking is carried out in three sections, and then assembly welding forming is carried out;

the support ring and the seat ring are assembled and mutually welded to form a slewing bearing mounting seat;

carrying out shot blasting stress removal treatment on the welding type slewing bearing mounting seat, and then machining a welding assembly according to the design requirement of a drawing;

and the welding type slewing bearing mounting seat is welded with the middle rack top plate.

7. The manufacturing technology of the slewing bearing mounting seat of the economical excavator according to claim 6, wherein when the welded slewing bearing mounting seat is welded with the top plate of the middle rack, the welding seams of the rib plate, the support ring and the bottom plate of the middle rack are welded firstly, the welding seams of the support ring of the slewing bearing mounting seat and the top plate of the middle rack are welded secondly, and the welding seams of the rib plate, the support ring and the top plate of the middle rack are welded finally.

Technical Field

The invention relates to the technical field of excavators, in particular to an economical excavator slewing bearing mounting seat and a manufacturing technology thereof.

Background

The excavator slewing bearing mounting seat is used as an important part of an excavator and used for placing and fixing a slewing bearing, and generally the slewing bearing mounting seat is forged and welded on the upper part of a middle platform frame top plate to realize connection between an upper vehicle and a lower vehicle. The strength of the slewing bearing mounting seat is the highest, and when the excavator works, the bearing load is transient and variable, so that the slewing bearing mounting seat not only bears the gravity and the gravity moment of a loading device and a working device, but also bears the working impact force, and the quality of the slewing bearing mounting seat directly influences the quality and the performance of the excavator.

In order to meet the objective requirement of excavator price drop, an economical excavator is provided, so that the cost is reduced, the survival profit is guaranteed, and the market share is improved on the premise of guaranteeing the quality of the whole excavator and reasonable profit. Because the slewing bearing mounting seat adopts a forged piece, the manufacturing cost is higher, and the requirements of cost reduction and efficiency improvement cannot be met, which is a problem to be solved urgently at present.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an economical excavator slewing bearing mounting seat and a manufacturing technology thereof, wherein the mounting seat is optimally designed into a multi-component welding mode by a forging mode on the premise of not changing the quality and the performance. The objective requirement of excavator price drop is met, so that the cost is reduced and the survival profit is guaranteed.

In order to achieve the purpose, the invention adopts the following technical scheme:

an economical excavator slewing bearing mounting seat comprises a seat ring and a support ring;

the upper end face of the support ring is welded with the lower end face of the seat ring.

Furthermore, the seat ring is formed by welding three sections of arc-shaped plates end to end.

Further, the seat ring is made of low-alloy high-strength structural steel Q345D.

Furthermore, the support ring is made of low-alloy high-strength structural steel Q345D and is rolled into a circular ring shape by a plate rolling machine, and the connection part of the circular ring is welded.

Further, the support ring of the slewing bearing mounting seat is welded with the top plate of the middle rack.

In order to achieve the purpose, the invention adopts the following technical scheme:

a manufacturing technology of an economical excavator slewing bearing mounting seat comprises the following steps:

the support ring is made of low-alloy high-strength structural steel Q345D, and is rolled by a plate rolling machine and welded to be formed;

the seat ring is made of low-alloy high-strength structural steel Q345D, blanking is carried out in three sections, and assembly welding forming is carried out;

the support ring and the seat ring are assembled and mutually welded to form a slewing bearing mounting seat;

carrying out shot blasting stress removal treatment on the welding type slewing bearing mounting seat, and then machining a welding assembly according to the design requirement of a drawing;

and the welding type slewing bearing mounting seat is welded with the middle rack top plate.

When the welding type slewing bearing mounting seat is welded with the middle rack top plate, the rib plates, the support rings and the related welding seams of the middle rack bottom plate are welded firstly, then the support rings of the slewing bearing mounting seat and the welding seams of the middle rack top plate are welded, and finally the rib plates, the support rings and the related welding seams of the middle rack top plate are welded.

Compared with the prior art, the invention has the following beneficial effects:

the support ring is made of low-alloy high-strength structural steel Q345D and is rolled and formed by a plate rolling machine. The seat ring is made of low-alloy high-strength structural steel Q345D, and is blanked in three sections and butt-welded. The support ring and the seat ring are assembled and welded into a slewing bearing mounting seat. And (4) carrying out shot blasting stress removal treatment on the welding type slewing bearing mounting seat, and then machining the welding assembly according to the design requirement of a drawing. And the welding type slewing bearing mounting seat is welded with the middle rack top plate. On the premise of not changing the quality and the performance, the mounting seat is optimally designed into a multi-component welding mode by a forging mode. The objective demand of the excavator price drop is adapted to reduce the cost and guarantee the survival profit, and the market share is improved on the premise of ensuring the quality of the whole excavator and reasonable profit.

Drawings

FIG. 1 is a schematic structural diagram of a slewing bearing mounting base of an economical excavator according to the present invention;

FIG. 2 is a perspective view of FIG. 1;

FIG. 3 is a schematic structural view of an economical excavator slewing bearing mounting seat welded on a middle rack according to the present invention;

FIG. 4 is a schematic illustration of blanking of multiple sets of support ring blanks;

FIG. 5 is a view of a plurality of support rings rolled together;

FIG. 6 is a view of a seat ring segment blanking row;

FIG. 7 is a multi-segment assembly welding forming diagram of the seat ring.

In the figure: a support ring 31; a seat ring 32; a support ring blank 311; a blanking break point 312; welding groove 313;

a top plate 21; a base plate 22; a support ring 23; a rib 24.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1 to 7, the present invention provides a technical solution:

an economical excavator slewing bearing mounting seat comprises a seat ring 32 and a support ring 31;

the upper end face of the support ring is welded with the lower end face of the seat ring.

Furthermore, the seat ring is formed by welding three sections of arc-shaped plates end to end.

Further, the seat ring is made of low-alloy high-strength structural steel Q345D.

Furthermore, the support ring is made of low-alloy high-strength structural steel Q345D and is rolled into a circular ring shape by a plate rolling machine, and the connection part of the circular ring is welded.

Further, the support ring of the slewing bearing mounting seat is welded with the middle stand top plate 21.

Example 2:

referring to fig. 1 to 7, the present invention provides a technical solution:

an economical excavator slewing bearing mounting seat and a manufacturing technology thereof comprise the following steps:

1. the support ring is made of low-alloy high-strength structural steel Q345D (suitable for low cold impact in the environment of-20 degrees), is rolled and formed by a plate rolling machine, and is formed by welding the connecting parts. Due to the mass production of the machine type, 4 pieces can be combined together for blanking, the blanks are rolled, corrected and formed, then are sequentially separated, and finally, corresponding grooves and blanking breakpoints are processed by gas cutting or machining according to design requirements. The support ring pieces are combined together for blanking, wherein corresponding blanking break points 312 can reduce blanking deformation, facilitate rolling, prevent deflection, bulging and other phenomena in the rolling process, and improve rolling efficiency.

2. The seat ring is made of low-alloy high-strength structural steel Q345D, blanking is carried out in three sections, and corresponding welding grooves are formed by gas cutting and are connected and welded. Three-section blanking is dispersed, so that the blanking is convenient to arrange, and a large amount of steel plates are saved. A groove 313 is formed in the welding position of the single blanking piece, welding is convenient, then three sections of the welding positions are combined into a seat ring, finally the groove position of the seat ring is welded, leveling treatment is carried out after welding is finished, and then tempering treatment is carried out, so that internal stress is reduced or eliminated, the hardness and the strength of the seat ring are reduced, and the ductility or the toughness of the seat ring are improved.

3. The support ring and the seat ring are assembled and welded to form the slewing bearing mounting seat. The support ring and the seat ring are assembled according to the design requirement, and two layers of three welding are adopted during welding, so that the phase change and stress concentration of the tissue are reduced, and the burning or the overlarge deformation is avoided; a groove is added at the welding position to improve the fatigue damage resistance of the welding type slewing bearing mounting seat. Two-layer three-pass welding is adopted, and the welding seam inspection shows that the welding mode has small influence on the base metal and can completely ensure the welding quality.

4. And performing shot blasting stress removal treatment on the slewing bearing mounting seat, and machining the welding part according to the design requirement of a drawing. Welding formula slewing bearing mount pad machining need carry out twice clamping, and the face is placed to the last car installation face lubricating oil pool of the last port of seat ring adopts the finish machining (no matter mill flat or drilling and to the requirement of precision, all be prior art's machining technology, no longer give unnecessary details), and the plane degree requirement is not more than 0.6, if both surpass will influence slewing bearing life-span and the sealed effect of lubricating oil pool sealing strip respectively.

5. The welding type pivoting support mounting seat is welded on the upper part of the top plate of the middle rack. Because the slewing bearing mounting seat is machined, when the slewing bearing mounting seat is welded with a middle-rack top plate assembly, the flatness of a connecting part between an upper plane of the slewing bearing mounting seat and an upper vehicle is out of tolerance due to the influence of welding thermal deformation factors, the deformation of the slewing bearing is aggravated, the slewing operation of the excavator causes abnormal sound of the slewing bearing, and the slewing bearing is seriously damaged. The welding type slewing bearing mounting seat needs to adopt reasonable welding process steps, the machined plane of the slewing bearing mounting seat and the upper vehicle connecting part is ensured to meet the assembly design requirement, and the slewing bearing mounting use performance requirement is met. See fig. 3, a schematic diagram of the middle stage. In order to ensure the flatness and the use requirement of the welding type slewing bearing mounting seat and reduce welding deformation, when the middle rack is welded, the welding seams of the rib plate, the support ring and the bottom plate of the middle rack are firstly welded, the welding seams of the support ring of the slewing bearing mounting seat and the top plate of the middle rack are secondly welded, and the welding seams of the rib plate, the support ring and the top plate of the middle rack are finally welded.

Through software ANSYS finite element analysis, the maximum stress that the welding type slewing bearing mounting seat can bear is about 1.5-2 times of the maximum stress that the forging type slewing bearing mounting seat can bear, and the welding type slewing bearing mounting seat has good bearing capacity and fatigue damage resistance. The cost saving effect is obvious, the profit space is greatly improved, for example, 20-ton economical excavator, the welding type slewing bearing mounting seat can save the cost of 800 yuan/piece relative to the forging type slewing bearing mounting seat, and according to the yield of 200 stands/month, the welding type slewing bearing mounting seat only saves the cost of 800X 200X 12 ═ 1920000 yuan one year, so that the welding type slewing bearing mounting seat has wide development prospect, application space and great popularization value.

All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. Such as welding, threaded connections, etc.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.