Large arm seat crack repairing structure for hydraulic excavator

Abstract

The utility model discloses a big arm seat crack repairing structure for a hydraulic excavator, which comprises a big arm seat and a repairing structure, the big arm seat is cracked at a pin shaft connecting hole, the repairing structure is arranged at the pin shaft connecting hole of the big arm seat, and the repairing structure further comprises a shaft hole, a wear-resistant circular plate, a reinforcing base plate, an arc reinforcing rib and a lengthened pin shaft. The utility model has the functions that the structure can effectively solve the problem of frequent cracking of the large arm seat of the hydraulic excavator, and after transformation and repair, the service life of the large arm seat of excavation equipment is obviously prolonged, the maintenance cost is reduced, the field maintenance labor intensity is reduced, the attendance rate of the equipment is increased, and the production efficiency of the equipment is improved. And meanwhile, the potential safety hazard problem of equipment accidents possibly caused by frequent cracking of the large arm seat is eliminated.

Description

Technical Field

[0001] The utility model patent belongs to the technical field of excavator repair, and particularly relates to a crack repair structure for the boom seat of a hydraulic excavator. Background Technique

[0002] For mining and excavation equipment, hydraulic excavators, with the increase of service life, frequent cracking occurs at the pin connection holes of the boom seat of the hydraulic excavator. Moreover, after multiple surface welding repairs of the boom seat, the stress intensity of the excavator boom seat is damaged and reduced. After multiple heating and welding operations on the boom seat, the metallographic structure (austenite, martensite, ferrite, pearlite, cementite) of the boom seat base material is gradually destroyed. During subsequent use, the boom seat of the hydraulic excavator will continuously crack frequently, with a very short service life, and there is also a risk of equipment safety accidents during equipment operation.

[0003] Through the analysis of usage data, after multiple frequent heating and welding of the boom seat, the stress intensity of the boom seat is significantly reduced, and the failure rate reaches about the same cracking failure problem occurring in less than 1 month.

[0004] In the past, for the repair method of the boom seat of a hydraulic excavator, only the cracked part of the boom seat was simply gouged and then welded and repaired. The characteristics of this welding repair method are: convenient, fast, universal, and general. However, after the repair, the service life during equipment operation is not long, and the same cracking failure will occur in a very short time. At the same time, it also reduces the steel stress intensity of the boom seat of the hydraulic excavator, destroys the metallographic structure of the boom seat base material, increases the maintenance cost and on-site maintenance labor intensity (because each time the cracking problem of the boom seat is welded and repaired, the boom and the boom connection pin of the hydraulic excavator need to be removed), the maintenance is frequent, and each maintenance time is too long, which also affects the production efficiency of equipment use.

[0005] Therefore, this article proposes a crack repair structure for the boom seat of a hydraulic excavator. Content of the Utility Model

[0006] In order to solve the above problems, the utility model provides a crack repair structure for the boom seat of a hydraulic excavator, which can extend the service life of the damaged boom seat.

[0007] To achieve the above technical effects, the present utility model is realized through the following technical solutions: A crack repair structure for the boom seat of a hydraulic excavator, including a boom seat with cracks at the pin connection holes and a repair structure. The repair structure is installed at the pin connection holes of the boom seat. The repair structure further includes a shaft hole, wear-resistant circular plates, reinforcing pads, arc reinforcing ribs, and an extended pin. The wear-resistant circular plates are welded to both outer sides of the boom seat, the reinforcing pads are welded to both inner sides of the boom seat. The new shaft hole on the boom seat is located 5 mm below the original shaft hole position. The arc reinforcing ribs are welded to the outer arc at the top of the boom seat and are welded and connected together with the wear-resistant circular plates, reinforcing pads, and the original base material of the boom seat to form an integral body. The increased length at both ends of the extended pin is equal to the thickness of the wear-resistant circular plates.

[0008] Preferably, a pin hole A corresponding to the shaft hole on the boom seat is provided in the wear-resistant circular plate.

[0009] Preferably, a pin hole B corresponding to the shaft hole on the boom seat is provided in the reinforcing pad.

[0010] Preferably, the wear-resistant circular plates, reinforcing pads, and arc reinforcing ribs are all made of low-alloy high-strength structural steel.

[0011] Preferably, 45° bevels are provided at the welding joints of the wear-resistant circular plates, reinforcing pads, arc reinforcing ribs and the boom seat.

[0012] Preferably, 45° bevels are provided at both ends of the arc reinforcing ribs.

[0013] The beneficial effects of the present utility model are:

[0014] This structure can effectively solve the problem of frequent cracking of the boom seat of the hydraulic excavator. After the transformation and repair, it significantly extends the service life of the boom seat of the mining equipment, reduces the maintenance cost, reduces the on-site maintenance labor intensity, improves the equipment attendance rate, and improves the equipment production efficiency. At the same time, it eliminates the potential safety hazard problems of equipment accidents that may be caused by the frequent cracking of the boom seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Without creative efforts, those skilled in the art can also obtain other drawings based on these drawings.

[0016] Figure 1 It is a structural diagram of the repair structure of the present utility model welded on the boom seat;

[0017] Figure 2 It is the front view of the repair structure of Embodiment 1 of the present utility model not welded on the boom seat;

[0018] Figure 3 Side view of the repair structure welded to the boom base in Embodiment 1 of the present utility model;

[0019] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0020] 1. Boom base; 2. Shaft hole; 3. Wear-resistant circular plate; 4. Reinforcing backing plate; 5. Arc reinforcing rib; 6. Extended pin; 7. Pin hole A; 8. Pin hole B. Specific implementation mode

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present utility model.

[0022] As Figure 1 shown, in this embodiment, the following problems exist in the prior art: The inventor found that if the material can be divided and transferred when the mining conveyor conveys the material, a lot of manpower and material resources can be saved. However, in medium and large open-pit mines, due to the large demand for conveying overburden waste rock or ore, conveyors with large transportation capacity and high running speed often need to be put into use. Therefore, the impact force of the material conveyed from the conveyor port is very large, and the stress surface of the material impact point is wide. Therefore, it is impossible to directly load and transfer the material;

[0023] Therefore, the inventor provides a crack repair structure for the boom base of a hydraulic excavator, including a boom base 1 with cracks at the pin connection hole and a repair structure. The repair structure is installed at the pin connection hole of the boom base 1. The repair structure further includes a shaft hole 2, a wear-resistant circular plate 3, a reinforcing backing plate 4, an arc reinforcing rib 5, and an extended pin 6. The wear-resistant circular plate 3 is welded to both sides of the outside of the boom base 1, the reinforcing backing plate 4 is welded to both sides of the inside of the boom base 1, the new shaft hole 2 on the boom base 1 is located 5 mm below the original shaft hole 2, the arc reinforcing rib 5 is welded to the outer arc at the top of the boom base 1 and is welded and connected to the wear-resistant circular plate 3, the reinforcing backing plate 4, and the original base metal of the boom base 1 to form a whole, and the increased length at both ends of the extended pin 6 is equal to the thickness of the wear-resistant circular plate 3 on the original shaft basis.

[0024] The effect is: This repair structure strengthens the strength of the original boom base 1 and the stress area of the pin by installing a reinforcing backing plate 4 inside the boom base 1 of the hydraulic excavator, playing a role in protecting the original boom base 1;

[0025] Weld wear-resistant circular plates 3 on both sides of the outside of the boom base 1 to increase the stress area of the boom pin hole 2 and the strength of the boom base 1, playing a role in protecting the original boom base 1;

[0026] After welding the wear-resistant circular plate 3 and the reinforcing backing plate 4, concentric boring is performed on the two boom pin holes 2, and the two newly made pin holes 2 of the boom seat 1 are vertically moved downward by 5 mm as a whole. The purpose of the downward movement is to increase the stress-bearing area and stress-bearing strength of the pin connecting and passing-through ears of the boom seat 1 on the basis of the original boom seat 1;

[0027] On the basis of the original pin, the length of the pin of the boom seat 1 is increased, and the increased dimension is equal to the thickness of a single wear-resistant circular plate 3, so as to increase the shaft length of the boom seat 1 and the overall stress-bearing area of the boom;

[0028] Arc reinforcing ribs 5 are welded at the outer arc of the boom seat 1, and are welded and connected with the wear-resistant circular plate 3, the reinforcing backing plate 4, and the original base material of the boom seat 1 into a whole, so as to prevent the single cracking of the backing plate and ensure uniform stress.

[0029] Furthermore, a pin hole A7 corresponding to the upper shaft hole 2 of the boom seat 1 is provided in the wear-resistant circular plate 3.

[0030] Furthermore, a pin hole B8 corresponding to the upper shaft hole 2 of the boom seat 1 is provided in the reinforcing backing plate 4.

[0031] Furthermore, the wear-resistant circular plate 3, the reinforcing backing plate 4, and the arc reinforcing ribs 5 are all made of low-alloy high-strength structural steel; through the experiments of the inventor, the two structural materials of the wear-resistant circular plate 3 and the reinforcing backing plate 4 can adopt Q355 low-alloy high-strength structural steel, while the arc reinforcing ribs 5 can adopt Q355 solid round steel, and J507RH basic electrode can be used during welding.

[0032] Furthermore, 45° bevels are provided at the welding joints of the wear-resistant circular plate 3, the reinforcing backing plate 4, the arc reinforcing ribs 5 and the boom seat 1; thereby ensuring the welding strength and stress discharge.

[0033] Furthermore, 45° bevels are provided at both ends of the arc reinforcing ribs 5; the purpose of opening the bevel at the tail end for welding: releasing the welding stress and increasing the welding strength. Embodiment 1

[0034] As Figures 2 to 3 shown, based on the above technical solution, the inventor carried out the following renovation and repair experiments on the cracked boom seat 1 of the hydraulic excavator at the work site:

[0035] Two wear-resistant circular plates 3 made of Q355 material are welded on both sides of the outside of the original boom seat 1 at the same time, and their dimensions are: inner hole diameter φ140 mm, thickness T30 mm, outer circle diameter φ300 mm.

[0036] Elliptical reinforcing backing plates 4 made of Q355 material are welded on the inner sides of the two original boom seats 1 respectively, and the specifications and models are as follows: from left to right:

[0037] ① 41 pieces of Q355 - 20mm elliptical reinforcing pads, ② 41 pieces of Q355 - 22mm elliptical reinforcing pads, ③ 41 pieces of Q355 - 25mm elliptical reinforcing pads, ④ 41 pieces of Q355 - 18mm elliptical reinforcing pads.

[0038] The reinforcing pad 4 needs to be customized through precise dimension measurement and is welded to the inner sides of the two parts of the boom seat 1, around the 4 pieces of Q355 - material reinforced elliptical pads. All are welded with a 45° bevel according to technical requirements. After welding, coaxial boring is performed on the two boom pin holes 2, and the two newly made pin holes 2 of the boom seat 1 are vertically moved downward by 5mm as a whole.

[0039] After all the 4 pieces of reinforced elliptical pads and the 2 circular plates at the outer edges of the shaft holes 2 are welded according to the process requirements, then use φ40mm Q355 solid round steel to weld the circular - arc reinforcing ribs 5 of the boom seat 1 around the 4 outer arcs of the boom seat 1. After welding is completed, 45° bevel welding is performed on both ends of the φ40mm Q355 solid round steel.

[0040] After repairing according to this repair structure, the inventor found that it can effectively solve the problem of frequent cracking of the boom seat 1 of the hydraulic excavator, significantly extend the service life of the boom seat 1 of the mining equipment, reduce the maintenance cost, reduce the on - site maintenance labor intensity, improve the equipment attendance rate, improve the equipment production efficiency. At the same time, eliminate the potential safety hazard problem of equipment accidents caused by the frequent cracking of the boom seat 1.

[0041] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above - mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non - restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0042] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A crack repair structure for a boom base of a hydraulic excavator, comprising a boom base (1) with cracks at a pin shaft connection hole, and a repair structure, characterized in that: A repair structure is installed at the pin connection hole of the boom seat (1), and the repair structure also includes an axis hole (2), a wear-resistant circular plate (3), a reinforcing pad (4), an arc reinforcing rib (5), and an extended pin shaft (6). The wear-resistant circular plate (3) is welded on both sides of the outside of the boom seat (1), and the reinforcing pad (4) is welded on both sides of the inside of the boom seat (1). The new axis hole (2) on the boom seat (1) is located 5 mm below the original axis hole (2). The arc reinforcing rib (5) is welded at the outer arc of the top of the boom seat (1) and is welded together with the wear-resistant circular plate (3), the reinforcing pad (4), and the original parent material of the boom seat (1) to form a whole. The length of the two ends of the extended pin shaft (6) increased on the basis of the original shaft is equal to the thickness of the wear-resistant circular plate (3).

2. The boom base crack repair structure for a hydraulic excavator according to claim 1, characterized in that: The wear-resistant circular plate (3) is provided with a pin hole A (7) corresponding to the shaft hole (2) on the large arm seat (1).

3. The crack repair structure for a boom base of a hydraulic excavator according to claim 1, characterized in that: The reinforcing pad (4) is provided with a pin hole B (8) corresponding to the shaft hole (2) on the upper arm seat (1).

4. The boom base crack repair structure for a hydraulic excavator according to claim 1, characterized in that: The wear-resistant circular plate (3), the reinforcing pad (4), and the arc reinforcing rib (5) are all made of low-alloy high-strength structural steel.

5. The boom base crack repair structure for a hydraulic excavator according to claim 1, characterized in that: The welding places between the wear-resistant circular plate (3), the reinforcing pad (4), the arc reinforcing rib (5) and the boom seat (1) are all provided with 45° grooves.

6. The boom base crack repair structure for a hydraulic excavator according to claim 1, characterized in that: Both ends of the arc reinforcing rib (5) are provided with 45° grooves.

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