Casting type integral track shoe for super-tonnage hydraulic excavator

Abstract

The casting type integral track shoe for the super-tonnage hydraulic excavator comprises a track shoe body, a connecting piece integrally formed with the track shoe body is arranged on the track shoe body, a first pin shaft hole and a second pin shaft hole are formed in the two ends of the connecting piece respectively, bushings are arranged in the first pin shaft hole and the second pin shaft hole respectively, and the first pin shaft hole and the second pin shaft hole are connected with the first pin shaft hole and the second pin shaft hole respectively. The utility model relates to a hinge pin. And when the bushing is worn to influence the normal operation of the equipment, only the bushing and the pin shaft need to be replaced. The maintenance cost is greatly reduced, and the downtime is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of crawler chassis, and particularly relates to a cast integral crawler plate for an extra-large tonnage hydraulic excavator. Background Technique

[0002] With the continuous prosperity and rapid development of the national mining industry, the demand for construction machinery is increasing day by day, which promotes the construction machinery industry to accelerate towards the heavy-duty and large-tonnage direction with higher performance and greater load-bearing capacity. This trend not only significantly improves the efficiency and scale of mineral extraction, but also makes various large-tonnage heavy construction machinery, such as extra-large hydraulic excavators, widely used in mines, infrastructure and other fields unprecedentedly.

[0003] In order to bear huge weights and complex working environments, at present, both domestic and foreign extra-large tonnage hydraulic excavators adopt cast integral crawler plates, and the crawler plates are connected by pin shafts. The cast integral crawler plates are generally expensive and have a long purchase cycle. During the walking process of the equipment, the crawler plates and the pin shafts are constantly worn, resulting in a reduced service life of the crawler plates, affecting the overall operation stability and operation efficiency of the equipment. Frequent maintenance and replacement of the crawler plates not only increase the operation cost of users, but also may lead to an extended downtime of the equipment, thus affecting the project progress and overall economic benefits. Content of the Utility Model

[0004] To solve the above problems in the prior art, the utility model provides a cast integral crawler plate for an extra-large tonnage hydraulic excavator, which includes a crawler plate body. A connecting member is integrally formed on the crawler plate body. First pin holes and second pin holes are respectively arranged at both ends of the connecting member, and bushings are arranged in both the first pin holes and the second pin holes for rotational cooperation with a pin shaft.

[0005] Further, the bushings are connected with the first pin holes and the second pin holes by interference fit.

[0006] Further, one end of the connecting member is a connecting plate portion provided with the first pin hole, and the other end is a fork head portion provided with the second pin hole. After the connecting plate portion of one crawler plate body is inserted into the fork head portion of another crawler plate body, the first pin hole and the second pin hole coincide.

[0007] Further, two bushings arranged oppositely are arranged in the first pin hole. The bushings are in a stepped shape, and counterbores for accommodating the diameter ends of the bushings are arranged at both the left and right ends of the first pin hole.

[0008] Further, a counterbore for accommodating the diameter end of the bushing is arranged at one end of the second pin hole for fitting with the first pin hole, and the small diameter end of the bushing extends to the other end of the second pin hole.

[0009] Furthermore, the crawler shoe body is made of chromium nickel molybdenum alloy steel.

[0010] Furthermore, the bushing material is 42CrMo.

[0011] Compared with the prior art, the utility model mainly has the following advantages:

[0012] For the integral cast crawler shoe for large-tonnage hydraulic excavators of the utility model, a bushing is arranged in the pin hole of the crawler shoe body, which can avoid the pin from wearing the crawler shoe body. When the bushing wears to affect the normal operation of the equipment, the user does not need to replace the entire expensive crawler shoe, but only needs to replace the two small parts of the bushing and the pin. This greatly reduces the maintenance cost, shortens the downtime, and ensures that the equipment can quickly resume the working state. Description of the Drawings

[0013] Figure 1 is a schematic structural view of the integral cast crawler shoe for large-tonnage hydraulic excavators of the utility model;

[0014] Figure 2 is a sectional view of the integral cast crawler shoe for large-tonnage hydraulic excavators of the utility model;

[0015] Figure 3 is Figure 2 a partial schematic view of

[0016] Figure 4 is a schematic structural view of the bushing of the utility model;

[0017] Figure 5 is a schematic structural view of the pin of the utility model.

[0018] In the figures: 1, crawler shoe body; 11, connecting piece; 111, first pin hole; 112, second pin hole; 2, bushing; 3, pin; 4, retaining ring. Detailed Embodiments

[0019] To make the objectives, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not intended to limit the scope of the utility model.

[0020] As Figure 1 , Figure 2As shown in the figure, the utility model provides a cast integral track shoe for an extra-large tonnage hydraulic excavator, which comprises a track shoe body 1. A connecting piece 11 integrally formed with the track shoe body 1 is arranged on the track shoe body 1. First pin holes 111 and second pin holes 112 are respectively arranged at two ends of the connecting piece 11. Bushings 2 are arranged in both the first pin holes 111 and the second pin holes 112. The bushings 2 are used for rotatably cooperating with a pin 3. This avoids the pin 3 from wearing the track shoe body 1. When the bushings 2 are worn to affect the normal operation of the equipment, only the bushings 2 and the pin 3 need to be replaced, greatly reducing the maintenance cost.

[0021] In some embodiments, one end of the connecting piece 11 is a connecting plate portion provided with the first pin hole 111, and the other end is a fork head portion provided with the second pin hole 112. After the connecting plate portion of one track shoe body 1 is inserted into the fork head portion of another track shoe body 1, the first pin hole 111 and the second pin hole 112 coincide. A pin 3 is inserted into the first pin hole 111 and the second pin hole 112. The pin 3 is rotatably connected to the bushings 2 inserted into the first pin hole 111 and the second pin hole 112. A retaining ring 4 is arranged at the end of the pin 3 to limit the axial sliding of the shaft 3. Through the cooperation of the pin 3 and the pin holes, the track shoe body 1 is rotatably connected to another adjacent track shoe body 1. Through the structures of the fork head portion and the connecting plate portion, the stability and reliability of the track shoe connection are enhanced. Even under harsh working conditions, stable performance can be maintained to ensure the normal operation of the equipment.

[0022] In some embodiments, as Figure 2 、 Figure 3 shown, two bushings 2 arranged oppositely are arranged in the first pin hole 111 of the connecting plate portion of the connecting piece 11. Among them, as Figure 4 shown, the bushing 2 is in a stepped shape. Counterbores for accommodating the large-diameter ends of the bushings 2 are arranged at the left and right ends of the first pin hole 111. The two bushings 2 are respectively inserted on the left and right sides of the first pin hole 111, and the ends of the small-diameter ends of the two bushings 2 abut against each other. For the convenience of installing the bushing 2, the large-diameter end of the bushing 2 and the counterbore of the first pin hole 111 are in a clearance fit. At the same time, to prevent the bushing 2 from falling off, the small-diameter end of the bushing 2 and the first pin hole 111 are in an interference fit.

[0023] In some embodiments, a counterbore for accommodating the large-diameter end of the bushing 2 is provided at one end of the second pin shaft hole 112 located at the fork head of the connecting member 11 for fitting with the first pin shaft hole 111. For the convenience of installing the bushing 2, there is a clearance fit between the large-diameter end of the bushing 2 and the counterbore of the second pin shaft hole 112. The small-diameter end of the bushing 2 extends to the other end of the second pin shaft hole 112. To prevent the bushing 2 from falling off, there is an interference fit between the small-diameter end of the bushing 2 and the second pin shaft hole 112. After the connecting plate portion of the track shoe body 1 is inserted into the fork head of another track shoe body 1, the first pin shaft hole 111 and the second pin shaft hole 112 coincide. The large-diameter ends of the bushings 2 on both left and right sides of the first pin shaft hole 111 abut against the large-diameter ends of the bushings 2 in the second pin shaft hole 112, preventing the bushings 2 from sliding along their axial directions and enhancing the stability and reliability of the track shoe connection.

[0024] In some embodiments, the track shoe body 1 is made of chromium-nickel-molybdenum alloy steel, produced by the furan resin sand casting process, and heat-treated by the quenching and tempering process. The metallographic structure is tempered sorbite. When quenching, the quenching medium is selected as quenching liquid plus water to prevent cracks in the track shoe caused by too fast cooling rate. After the track shoe is tempered, shot blasting treatment is carried out.

[0025] In some embodiments, the materials of both the bushing 2 and the pin shaft 3 are 42CrMo, and they are heat-treated by the quenching and tempering plus surface induction quenching process. The matrix hardness of the bushing 2 and the pin shaft 3 is 260 - 320 HBW, and the hardness of the contact surface between the bushing 2 and the pin shaft 3 is 45 - 55 HRC.

[0026] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A cast integral track shoe for an extra-large tonnage hydraulic excavator, characterized in that, It includes a crawler plate body (1), and a connecting member (11) integrally formed with the crawler plate body (1) is provided on the crawler plate body (1). First pin holes (111) and second pin holes (112) are respectively provided at both ends of the connecting member (11), and bushings (2) are provided in both the first pin holes (111) and the second pin holes (112) for rotatably cooperating with a pin (3).

2. The cast integral track shoe for super-large tonnage hydraulic excavators according to claim 1, characterized in that, The bushing (2) is connected to the first pin hole (111) and the second pin hole (112) by interference fit.

3. The cast integral track shoe for an extra-large tonnage hydraulic excavator according to claim 1, characterized in that, One end of the connecting member (11) is a connecting plate portion provided with the first pin hole (111), and the other end is a fork head portion provided with the second pin hole (112). After the connecting plate portion of the crawler plate body (1) is inserted into the fork head portion of another crawler plate body (1), the first pin hole (111) and the second pin hole (112) coincide.

4. The cast integral crawler shoe for super-large tonnage hydraulic excavators according to claim 3, characterized in that, Two bushings (2) arranged oppositely are provided in the first pin hole (111). Among them, the bushing (2) is stepped, and counterbores for accommodating the large-diameter ends of the bushings (2) are provided at both the left and right ends of the first pin hole (111).

5. The cast integral track shoe for super-large-tonnage hydraulic excavators according to claim 4, characterized in that A counterbore for accommodating the large-diameter end of the bushing (2) is provided at one end of the second pin hole (112) for fitting with the first pin hole (111), and the small-diameter end of the bushing (2) extends to the other end of the second pin hole.

6. The cast integral track shoe for an extra-large tonnage hydraulic excavator according to claim 1, wherein, The crawler plate body (1) is made of chromium nickel molybdenum alloy steel.

7. The cast integral track shoe for super-large tonnage hydraulic excavators according to claim 1, characterized in that, The material of the bushing (2) is 42CrMo.

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