CN117113534A - Design method and structure of mining self-discharging carriage bucket bottom plate - Google Patents

Abstract

The invention discloses a design method and structure of the bucket bottom plate of a mining dump truck. According to the design requirements of the mine road surface and material characteristics, the invention analyzes the changes in the angle of repose of the material at different installation angles of the bucket, and provides a design of the bucket installation angle. According to the structure characteristics and load-bearing characteristics of the bucket floor, the anti-deformation design of the bucket floor is carried out. Finally, based on discrete element technology, the accumulation form of the material in the bucket after the bucket is loaded with materials is studied, and the discharge end of the bucket floor is The contour line is designed as a material accumulation shape line. This invention determines the reasonable installation angle of the bucket based on the principle of minimum material sliding, and changes the traditional flat-type bucket bottom plate into a left inclined plate + flat plate + right inclined plate type, which improves the rigidity of the bucket and is based on the natural stacking of materials. In this state, the discharge end of the bottom plate of the compartment is partially lengthened, which increases the loading capacity of the compartment and improves transportation efficiency.

Description

A design method and structure of the bucket floor of a mining dump car

Technical field

The invention belongs to the technical field of mining vehicles, and specifically relates to a design method and structure of a bucket floor of a mining dump carriage.

Background technique

Mining dump trucks are the main means of transportation in large-scale open-pit coal mines. They have the advantages of large load capacity and adaptability to various harsh environments. The bucket is the part of the mining dump truck that is in direct contact with the material. It consists of a top plate, a front plate, a side plate, and a bottom plate. The bottom plate is the most important load-bearing component of the mining dump truck bucket, and it often bears huge impact during the loading process. At the same time, the bottom plate of the compartment and the frame are connected through hinge holes and have a certain installation angle. The size of the installation angle will directly affect the stability of the materials during transportation. Therefore, the optimization of the bottom plate structure and installation angle plays an important role in improving the stiffness and strength of mining dump trucks and the stability of materials during transportation.

The traditional mining dump truck bucket floor usually has a flat structure. However, after long-term use, it was found that the flat plate structure deforms greatly at the position near the side plate on the bucket floor under the impact and pressure of the material, making it difficult to work for a long time. The floor of the trunk bucket is prone to fatigue fracture, which increases maintenance time. At the same time, the tail edge of the existing flat structure is in a straight line. When the materials are stacked inside the bucket and remain stationary, the materials near the tail of the bucket are more likely to be scattered due to the vibration and braking of the mine car, which reduces the transportation cost. efficiency. In addition, the design of the installation angle of the bucket floor lacks theoretical guidance. How to select the appropriate bucket installation angle while ensuring the stability of the material has become a key issue that structural engineers need to solve urgently.

Contents of the invention

The object of the present invention is to provide a design method and structure of the bucket floor of a mining dump car, so as to provide a basis for the structural design of the bucket floor.

In order to achieve the above objectives, a mining dump truck bucket floor design method and structure of the present invention specifically include the following steps:

S1. According to the mine road design requirements and material characteristics, analyze the changes in the repose angle of the material under different installation angles of the bucket, and provide the design basis for the installation angle of the bucket floor, specifically:

S11. According to the installation requirements of the compartment, establish discrete element models of the compartment at different installation angles under horizontal road driving conditions. The installation angle range is from 0 to 20°. A discrete element model is built every 1°, with a total of 21 groups. , calculate the angle of repose of materials in the bucket at different installation angles i is the installation angle of the compartment, its value is 0~20;

S12. Based on the mine road slope requirements, establish a discrete element model of the bucket at different installation angles under the maximum climbing condition. The installation angle corresponds to the installation angle under the horizontal road driving condition in S11. Analyze the bucket when climbing the mine car. The angle of repose of the inner material δ _i ;

S13. Based on the repose angle of the material at different installation angles when the bucket is traveling on a level road and climbing a slope in steps S11 and S12, calculate the sliding angle ε _i of the material at each installation angle when the mining dump truck climbs a slope. , as shown in formula (1), based on the principle of minimum material sliding angle, determine the reasonable installation angle of the compartment;

S2. According to the structural characteristics and load-bearing characteristics of the bucket floor, the bucket floor is composed of the floor surface and reinforcing ribs. After the bucket is installed, the left and right longitudinal beams are in contact with the frame. It can be seen that the bucket floor points from the left longitudinal beam. The load-bearing characteristics of the bottom plate in the direction of the left panel are similar to those of the cantilever structure. Similarly, the load-bearing characteristics of the bottom panel of the compartment from the right longitudinal beam to the direction of the right panel are similar to the cantilever beam structure. According to the structural characteristics of the cantilever beam, the compartment The bottom plate is designed for anti-deformation, that is, the two ends of the bottom plate close to the left and right panels are tilted upward at a certain angle to establish an initial model of the compartment bottom plate;

S3. Based on discrete element technology, study the accumulation shape of materials in the bucket after the bucket is loaded with materials, and design the contour line of the discharge end of the bucket bottom plate as the material accumulation shape line.

Furthermore, the bottom plate of the mining dump truck bucket includes a bottom plate surface and reinforcing ribs. The whole bottom plate surface has a three-section structure, including a flat plate, a left inclined plate, and a right inclined plate.

Further, the flat plate means that the compartment is parallel to the horizontal plane when placed on the ground. The left inclined plate and the right inclined plate are respectively arranged on both sides of the flat plate and fixed with the flat plate through welding, and are close to the left side plate or the right side plate along the distance away from the flat plate. One end is tilted upward by 1 to 5°.

Further, the reinforcement includes a left longitudinal beam, a right longitudinal beam, a number of cross beams and a number of inclined beams. The left longitudinal beam and the right longitudinal beam are symmetrically welded to the lower end of the flat plate, and the positions of the left longitudinal beam and the right longitudinal beam are based on the mine. Determine the position of the dump truck bucket frame.

Furthermore, the cross-sections of the left and right longitudinal beams are U-shaped reinforcements, which are symmetrically welded below the flat plate.

Further, the middle position of the discharge end of the bucket bottom plate protrudes at an inclination angle of 3 to 5°, and the protruding portion is in the shape of an isosceles triangle, with the apex of the triangle located on the longitudinal center line of the bottom plate.

The invention proposes a design method and structure of the bucket floor of a mining dump truck, which provides a basis for the structural design of the bucket floor. Compared with existing technology, it has the following advantages:

1. According to the design requirements of the mine road surface, analyze the changes in the repose angle of the material under different installation angles of the bucket, and determine the reasonable installation angle of the bucket based on the principle of minimum material sliding.

2. Change the traditional flat-type bucket bottom plate to a left inclined plate + flat plate + right inclined plate type. The angle between the inclined plate and the horizontal plane is 1 to 5°, which can improve the rigidity of the bucket.

3. According to the natural stacking state of materials, the discharge end of the bucket floor is partially lengthened to form an inclination angle of 3-5°, which increases the loading capacity of the bucket and improves transportation efficiency.

Description of drawings

Figure 1 is a general flow chart of the design method and structure of the bucket floor of a mining dump car provided by the present invention;

Figure 2 is an isometric view of a mining dump truck bucket provided by the present invention;

Figure 3 is a schematic front view of the bucket floor of a mining dump car provided by the present invention;

Figure 4 is a schematic top view of the bucket floor of a mining dump car provided by the present invention;

Figure 5 is an isometric view of the bucket floor of a mining dump car provided by the present invention.

Components in the picture: 1 is the left inclined plate, 2 is the flat plate, 3 is the right inclined plate, 4 is the cross beam, 5 is the right longitudinal beam, 6 is the left longitudinal beam, 7 is the inclined beam, 8 is the left side plate, 9 is the front plate. , 10 is the front top plate, 11 is the right side plate.

Detailed ways

The design method and structure of the bucket floor of a mining dump car proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, it is a general flow chart of the design method and structure of the bucket floor of a mining dump truck proposed by the present invention, which specifically includes the following steps:

S1. According to the mine road design requirements and material characteristics, analyze the changes in the repose angle of the material under different installation angles of the bucket, and provide the design basis for the installation angle of the bucket floor, specifically:

S11. According to the installation requirements of the compartment, establish discrete element models of the compartment at different installation angles under horizontal road driving conditions. The installation angle range is from 0 to 20°. A discrete element model is built every 1°, with a total of 21 groups. , calculate the angle of repose of materials in the bucket at different installation angles i is the installation angle of the compartment, its value is 0~20;

S12. Based on the mine road slope requirements, establish a discrete element model of the bucket at different installation angles under the maximum climbing condition. The installation angle corresponds to the installation angle under the horizontal road driving condition in S11. Analyze the bucket when climbing the mine car. The angle of repose of the inner material δ _i ;

S13. Based on the repose angle of the material at different installation angles when the bucket is traveling on a level road and climbing a slope in steps S11 and S12, calculate the sliding angle ε _i of the material at each installation angle when the mining dump truck climbs a slope. , as shown in formula (1), based on the principle of minimum material sliding angle, determine the reasonable installation angle of the compartment;

S2. According to the structural characteristics and load-bearing characteristics of the compartment floor, the compartment floor is composed of the floor surface and reinforcing ribs. The reinforcing ribs are composed of left longitudinal beam 6, right longitudinal beam 5 and a number of cross beams 4. After the compartment is installed, the left longitudinal beam 6 and The right longitudinal beam 5 is in contact with the vehicle frame. From this, it can be seen that the load-bearing characteristics of the floor surface in the direction of the left longitudinal beam 6 and the left side plate 8 are similar to the cantilever beam structure. Similarly, the compartment floor points from the right longitudinal beam 5 to the right. The load-bearing characteristics of the bottom plate in the direction of side plate 11 are similar to the cantilever beam structure. According to the structural characteristics of the cantilever beam, the anti-deformation design of the bottom plate of the compartment is carried out, that is, the two ends of the bottom plate close to the left side plate 8 and the right side plate 11 are tilted upward at a certain angle. , establish the initial model of the compartment floor;

S3. Based on discrete element technology, study the accumulation shape of materials in the bucket after the bucket is loaded with materials, and design the contour line of the discharge end of the bucket bottom plate as the material accumulation shape line.

Furthermore, the bottom plate of the mining dump truck bucket includes a bottom plate surface and reinforcing ribs. The whole bottom plate surface has a three-section structure, including a flat plate 2, a left inclined plate 1, and a right inclined plate 3.

Furthermore, the flat plate 2 means that the compartment is parallel to the horizontal plane when placed on the ground. The left inclined plate 1 and the right inclined plate 3 are respectively arranged on both sides of the flat plate 2 and fixed with the flat plate 2 through welding, and are along the direction away from the flat plate 2 and close to the left One end of the side plate 8 or the right side plate 11 is inclined upward by 1 to 5°.

Further, the reinforcement includes a left longitudinal beam 6, a right longitudinal beam 5, a number of cross beams 4 and a number of inclined beams 7. The left longitudinal beam 6 and the right longitudinal beam 5 are both symmetrically welded to the lower end of the flat plate 2, and the left longitudinal beam 6 The position of the right longitudinal beam 5 is determined based on the position of the mining dump truck bucket frame.

Furthermore, the cross-sections of the left longitudinal beam 6 and the right longitudinal beam 5 are U-shaped reinforcement ribs, which are symmetrically welded below the flat plate 2 .

Further, the middle position of the discharge end of the bucket bottom plate protrudes at an inclination angle of 3 to 5°, and the protruding portion is in the shape of an isosceles triangle, with the apex of the triangle located on the longitudinal center line of the bottom plate.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (6)

1. A design method and structure of a mining self-discharging carriage bucket bottom plate are characterized by comprising the following steps:

s1, analyzing the change of the repose angle of the material of the bucket under different installation angles according to the design requirement of the mine pavement and the material characteristics, and giving out the design basis of the installation angle of the bucket base plate, wherein the design basis is as follows:

s11, respectively establishing discrete element models of the carriage under the running condition of the horizontal road surface at different installation angles according to the carriage installation requirements, wherein the change range of the installation angles is 0-20 degrees, and establishing a discrete element model at intervals of 1 degree, wherein 21 groups are used for calculating the repose angle of the materials in the carriage under different installation anglesi is the mounting angle of the carriage bucket, and the value of i is 0-20;

s12, establishing a carriage under the maximum climbing working condition based on the gradient requirement of the mine pavementDiscrete element models with different installation angles of the hopper, wherein the installation angles correspond to the installation angles of the horizontal road surface running working condition in S11, and the repose angle delta of materials in the hopper of the hopper during climbing of the mine car is analyzed _i ；

S13, calculating sliding angles epsilon of materials under each installation angle due to climbing of the mining dump truck according to the repose angles of the materials when the carriage bucket runs on a horizontal road and climbs under two working conditions of S11 and S12 _i As shown in the formula (1), determining a reasonable installation angle of the hopper by taking the minimum material sliding angle as a principle;

s2, according to the structural characteristics and bearing characteristics of the bottom plate of the car hopper, the bottom plate of the car hopper consists of a bottom plate surface and reinforcing ribs, the reinforcing ribs consist of a left longitudinal beam, a right longitudinal beam and a plurality of cross beams, after the car hopper is installed, the left longitudinal beam and the right longitudinal beam are in contact with a frame, so that the bearing characteristics of the bottom plate of the car hopper, which is pointed to the bottom plate surface towards the left side plate by the left longitudinal beam, are similar to those of a cantilever beam structure, and likewise, the bearing characteristics of the bottom plate of the car hopper, which is pointed to the bottom plate surface towards the right side plate by the right longitudinal beam, are similar to those of the cantilever beam structure, and the bottom plate of the car hopper is subjected to reverse deformation design according to the structural characteristics of the cantilever beam, namely, the bottom plate surface is inclined upwards by a certain angle at two ends close to the left side plate and the right side plate, and an initial model of the bottom plate of the car hopper is established;

s3, researching the accumulation form of the materials in the hopper after loading the materials in the hopper based on discrete element technology, and designing the contour line of the discharging end of the bottom plate of the hopper as a material accumulation form line.

2. The mining self-discharging compartment bucket bottom plate design method and structure according to claim 1, wherein the bucket bottom plate comprises a bottom plate surface and reinforcing ribs, and the bottom plate surface is integrally of a three-section structure and comprises a flat plate, a left inclined plate and a right inclined plate.

3. The design method and structure of the bottom plate of the mining self-discharging compartment bucket according to claim 2, wherein the flat plate is parallel to a horizontal plane when the compartment bucket is placed on the ground, the left inclined plate and the right inclined plate are respectively arranged on two sides of the flat plate and fixed with the flat plate through welding, and the flat plate is inclined upwards by 1-5 degrees along one end far away from the flat plate and close to the left side plate or the right side plate.

4. The mining self-discharging carriage bucket bottom plate design method and structure according to claim 2, wherein the reinforcing ribs comprise a left longitudinal beam, a right longitudinal beam, a plurality of cross beams and a plurality of inclined beams, the left longitudinal beam and the right longitudinal beam are symmetrically welded at the lower end of the flat plate, and the positions of the left longitudinal beam and the right longitudinal beam are determined according to the positions of the mining self-discharging carriage bucket frame.

5. The method and structure for designing a bottom plate of a mining dump truck bed according to claim 4, wherein the cross sections of the left longitudinal beam and the right longitudinal beam are U-shaped reinforcing ribs, and are symmetrically welded below the flat plate.

6. The method and structure for designing a bottom plate of a mining dump truck bed according to claim 1, wherein the middle position of the discharge end of the bottom plate of the truck bed is protruded by 3-5 degrees of inclination angle, the protruded part is in an isosceles triangle shape as a whole, and the vertex of the triangle is positioned on the longitudinal central line of the bottom plate.