A lower bottom plate structure for improving the connecting strength of a push shovel base and a bottom frame of an excavator

Abstract

The utility model relates to excavator technical field especially relates to a lower bottom plate structure of improving excavator chassis and push shovel seat connecting strength, include: lower bottom plate body, a plurality of first connecting hole, symmetry is opened in the surface of lower bottom plate body, a plurality of first reinforcing rib, fixed mounting in the top of lower bottom plate body, and first reinforcing rib longitudinal extension and exceed the region of first connecting hole, every first connecting hole all place between the corresponding two first reinforcing rib. The utility model discloses through the lower bottom plate structure that local thickening piece, first reinforcing rib, second reinforcing rib and lateral flanging cooperate, can effectively resist complex alternating load, significantly reduce the cracking, deformation and bolt loosening failure of connecting position, greatly improve the reliability and durability of excavator chassis and push shovel seat connection, prolong the service life of complete machine.

Description

Technical Field

[0001] This utility model relates to the field of excavator technology, and in particular to a lower base plate structure that improves the connection strength between the excavator underframe and the pusher mount. Background Technology

[0002] The excavator's pusher is fixed to the lower front of the underframe via a pusher mount. During operation (such as leveling the ground, assisting in excavation, supporting the machine, etc.), the pusher is subjected to complex alternating loads, which are mainly transferred to the lower base plate of the underframe through the pusher mount.

[0003] Traditional bottom plate structures are typically a thick flat plate with several bolt holes, connected to the pusher plate seat by high-strength bolts. This structure has the following main problems:

[0004] 1. The load is mainly concentrated in the bolt hole area connecting the lower base plate and the pusher seat, as well as the welding area between the lower base plate and the base frame. Under long-term alternating load, these areas are prone to stress concentration, which can lead to fatigue cracking of the weld or cracks in the lower base plate body near the hole or weld.

[0005] 2. Traditional bottom plates are prone to local deformation under bending moment, which not only affects the reliability of the connection, but also accelerates bolt loosening and fatigue failure. Utility Model Content

[0006] The purpose of this utility model is to solve the problems in the background art by proposing a lower base plate structure that improves the connection strength between the excavator underframe and the pusher seat.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A lower base plate structure for improving the connection strength between the excavator underframe and the pusher mount, comprising:

[0009] Lower base body;

[0010] Multiple first connection holes are symmetrically opened on the surface of the lower base plate body;

[0011] Multiple first reinforcing ribs are fixedly installed on the top of the lower base plate body, and the first reinforcing ribs extend longitudinally and beyond the area of ​​the first connecting holes, with each first connecting hole located between two corresponding first reinforcing ribs;

[0012] Multiple locally thickened blocks are fixedly installed on the bottom of the lower base plate body, and each locally thickened block has a second connecting hole on its top, and the second connecting hole is connected to the corresponding first connecting hole.

[0013] Two lateral flanges are fixedly installed at both ends of the lower base plate body, and the lateral flanges are inclined.

[0014] Preferably, a second reinforcing rib is fixedly installed between each pair of adjacent first reinforcing ribs, and adjacent second reinforcing ribs are cross-fixed on the top of the lower base plate body.

[0015] Preferably, the opposite edges of each pair of adjacent first connecting holes and second connecting holes are provided with chamfered edges.

[0016] Preferably, each first connecting hole is placed between two sets of intersecting second reinforcing ribs.

[0017] Preferably, each of the first reinforcing rib, the locally thickened block, and the second reinforcing rib is made of high-strength structural steel.

[0018] Compared with existing technologies, the advantages of the lower base plate structure provided by this utility model for improving the connection strength between the excavator underframe and the pusher mount are as follows:

[0019] 1. By adding thickened blocks around the first connecting hole, the material thickness around the first connecting hole on the bottom plate body is increased, which significantly improves the load-bearing capacity and resistance to compression and shear in this area, reduces the peak stress at the hole edge, and effectively prevents cracking around the hole.

[0020] 2. The first and second reinforcing ribs work together to form a "grid-like" reinforcing structure, which greatly enhances the stiffness and bending resistance of the entire bottom plate in the longitudinal, transverse and torsional directions. This greatly reduces the deformation of the bottom plate body when it is subjected to the bending moment transmitted from the pusher seat, ensuring the stability of the connection and reducing the additional bending stress of the bolts.

[0021] 3. By setting the lateral flanges on both sides of the lower base plate body, a welding surface with the base frame is provided, which greatly increases the weld length and the amount of deposited metal, significantly improves the stress state of the welding area, and transfers the load more directly to the web of the base frame, effectively disperses the stress concentration at the root of the weld, and greatly reduces the risk of weld fatigue cracking.

[0022] In summary, this utility model, through the combination of locally thickened blocks, a first reinforcing rib, a second reinforcing rib, and a lower base plate structure with lateral flanges, can effectively resist complex alternating loads, significantly reduce cracking, deformation, and bolt loosening failure at the connection points, greatly improve the reliability and durability of the connection between the excavator underframe and the pusher mount, and extend the service life of the entire machine. Attached Figure Description

[0023] Figure 1 This is a first-view structural diagram of a lower base plate structure for improving the connection strength between the excavator underframe and the pusher mount, as proposed in this utility model.

[0024] Figure 2This is a second-view structural diagram of a lower base plate structure for improving the connection strength between the excavator underframe and the pusher mount, as proposed in this utility model.

[0025] Figure 3 This is a schematic diagram of the clamping assembly in the lower base plate structure for improving the connection strength between the excavator underframe and the pusher seat, as proposed in this utility model.

[0026] In the figure: 1. Lower base plate body, 2. First connecting hole, 3. First reinforcing rib, 4. Partially thickened block, 5. Second connecting hole, 6. Lateral flange, 7. Second reinforcing rib, 8. Chamfered edge. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Reference Figures 1 to 3 A lower base plate structure for improving the connection strength between the excavator underframe and the pusher mount, comprising:

[0029] The lower base plate body 1 has multiple first connecting holes 2 symmetrically opened on the surface of the lower base plate body 1, and multiple local thickening blocks 4 fixedly installed on the bottom of the lower base plate body 1. Each local thickening block 4 has a second connecting hole 5 on its top, and the second connecting hole 5 is connected to the corresponding first connecting hole 2. The material thickness around the first connecting holes 2 on the lower base plate body 1 is increased, which significantly improves the load-bearing capacity and resistance to compression and shear in this area, reduces the peak stress at the hole edge, and effectively prevents cracking around the hole.

[0030] Multiple first reinforcing ribs 3 are fixedly installed on the top of the lower base plate body 1, and the first reinforcing ribs 3 extend longitudinally and beyond the area of ​​the first connecting holes 2. Each first connecting hole 2 is placed between two corresponding first reinforcing ribs 3, which can directly bear and transmit the longitudinal load from the pusher seat, effectively disperse the stress in the area of ​​the first connecting hole 2, avoid excessive stress concentration, and enhance the overall rigidity of the area. A second reinforcing rib 7 is fixedly installed between each two adjacent first reinforcing ribs 3, and adjacent second reinforcing ribs 7 are cross-fixed on the top of the lower base plate body 1. Each first connecting hole 2 is placed between two corresponding sets of cross second reinforcing ribs 7, which together form a "grid" reinforcing structure, greatly enhancing the rigidity and bending resistance of the entire lower base plate in the longitudinal, transverse and torsional directions. This greatly reduces the deformation of the lower base plate body 1 when subjected to the bending moment transmitted from the pusher seat, ensures the stability of the connection, and reduces the additional bending stress of the bolts.

[0031] Two lateral flanges 6 are fixedly installed on the two ends of the lower base plate body 1, and the lateral flanges 6 are inclined to provide a welding surface with the base frame, which greatly increases the weld length and the amount of deposited metal, significantly improves the stress state of the welding area, and transfers the load more directly to the web of the base frame, effectively disperses the stress concentration at the root of the weld, and greatly reduces the risk of weld fatigue cracking.

[0032] Furthermore, each pair of adjacent first connecting holes 2 and second connecting holes 5 has a chamfered edge 8 on the opposite edge, which plays a certain guiding role and can more easily reduce damage when the assembly bolt passes through the first connecting hole 2 and the second connecting hole 5.

[0033] The working principle of this utility model:

[0034] During installation, the lower base plate body 1 is placed at a predetermined position below the left and right longitudinal beams of the excavator underframe, and its upper surface is welded to the lower flange plate of the underframe. At the same time, the lateral flanges 6 on both sides of the lower base plate body 1 are fitted to the outer side of the web plate on the underframe and welded firmly by continuous fillet welds.

[0035] Next, place the excavator pusher seat under the lower base plate body 1, aligning the through holes on the pusher seat with the first connecting holes 2 on the lower base plate body 1. Then, use high-strength bolts, nuts, and washers to pass through the first connecting holes 2 and the second connecting holes 5 to fasten the excavator pusher seat onto the lower base plate body 1.

[0036] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lower base plate structure for improving the connection strength between the excavator underframe and the pusher mount, characterized in that, include: Lower base body (1); Multiple first connecting holes (2) are symmetrically opened on the surface of the lower base plate body (1); Multiple first reinforcing ribs (3) are fixedly installed on the top of the lower base plate body (1), and the first reinforcing ribs (3) extend longitudinally and extend beyond the area of ​​the first connecting hole (2). Each first connecting hole (2) is placed between two corresponding first reinforcing ribs (3). Multiple local thickening blocks (4) are fixedly installed on the bottom of the lower base plate body (1), and each local thickening block (4) has a second connecting hole (5) on its top, and the second connecting hole (5) is connected to the corresponding first connecting hole (2). Two side flanges (6) are fixedly installed on the two ends of the lower base plate body (1), and the side flanges (6) are inclined.

2. The lower base plate structure for improving the connection strength between the excavator underframe and the pusher mount according to claim 1, characterized in that, A second reinforcing rib (7) is fixedly installed between each pair of adjacent first reinforcing ribs (3), and adjacent second reinforcing ribs (7) are cross-fixed on the top of the lower base plate body (1).

3. The lower base plate structure for improving the connection strength between the excavator underframe and the pusher mount according to claim 1, characterized in that, Each pair of adjacent first connecting holes (2) and second connecting holes (5) has a chamfered edge (8) on the opposite edge.

4. The lower base plate structure for improving the connection strength between the excavator underframe and the pusher mount according to claim 1, characterized in that, Each first connecting hole (2) is placed between two sets of intersecting second reinforcing ribs (7).

5. The lower base plate structure for improving the connection strength between the excavator underframe and the pusher mount according to claim 2, characterized in that, Each of the first reinforcing rib (3), the locally thickened block (4), and the second reinforcing rib (7) is made of high-strength structural steel.

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