CN211051629U

CN211051629U - Semi-autogenous mill

Info

Publication number: CN211051629U
Application number: CN201921556982.7U
Authority: CN
Inventors: 段胜红; 高起方; 谢恩龙; 姜亚雄; 尹福兴; 汪勇; 庄世明; 肖欢
Original assignee: Heqing Beiya Mining Co ltd
Current assignee: Heqing Beiya Mining Co ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-07-21
Anticipated expiration: 2029-09-19

Abstract

The utility model belongs to the technical field of mining mechanical equipment, concretely relates to semi-autogenous mill, including semi-autogenous mill barrel, ejection of compact end cover, grid plate, feed end, discharge end, barrel welt, its characterized in that, grid plate central authorities exit is provided with the screen cloth. The screen cloth has two, is the bucket form, and two screen cloth nests and sets up, is one-level screen cloth and second grade screen cloth respectively, and the second grade screen cloth is connected with the discharge end, and one-level screen cloth central authorities are provided with the screw rod, and the one-level screen cloth passes through the central bottom plate threaded connection of screw rod and second grade screen cloth. The aperture of the secondary screen mesh is more than 70mm, and the aperture of the primary screen mesh is 20-30 mm. The utility model discloses a mill can be collected difficult mill obstinate stone, and the handling capacity increases greatly, and manufacturing cost reduces, has improved company economic benefits.

Description

Semi-autogenous mill

Technical Field

The utility model belongs to the technical field of mining mechanical equipment, concretely relates to semi-autogenous mill.

Background

The semi-autogenous mill is a device for grinding ores by partially utilizing ores and partially utilizing steel balls as grinding media, and the semi-autogenous mill is used for grinding ores from the viewpoint of effective utilization of energy, so that the energy consumption is relatively high. But the semi-autogenous mill replaces the operations of medium and fine crushing, screening and ore transfer alleviation, so that the flow is shortened, the generation of dust is reduced, and the influence on the environment is small. Meanwhile, the denudation and grinding of the ore mainly depend on the ore, the consumption of the steel balls is low, and the influence on the chemistry or electrochemistry of the subsequent flotation operation is small, so that the denudation and grinding method is more and more concerned by people.

The discharge end ore discharge grid plate structure of the original semi-autogenous mill comprises an inner ring grid plate and an outer ring grid plate in the radial direction, a plurality of groups of discharge grid holes are distributed on the grid plate, the aperture size is 40mm, the opening area occupancy rate is 8.5 percent, and 30 percent of the length direction and the pulp movement direction are formed⁰The angle distribution of (1) is that the grid holes are far away from the outmost layer (material layer close to the mill cylinder) of the mill cylinder material, the structure arrangement makes the difficult-to-grind hard rock (critical particles) of 30 mm-70 mm in the semi-autogenous mill difficult to discharge, and simultaneously also hinders the quick discharge of smaller ore particles, so that the running load of the semi-autogenous mill is increased, the processing capacity is sharply reduced, the ball milling load of the second section is too small, the production technical index of the whole process is finally reduced, and the production cost is increased.

Disclosure of Invention

In order to solve the problem, the utility model provides a modified semi-autogenous mill can effectively collect difficult stubborn stones.

The specific technical scheme is as follows:

the utility model provides a semi-autogenous mill, includes semi-autogenous mill barrel, discharge end cover, grid plate, feed end, discharge end, barrel welt, grid plate central exit is provided with the screen cloth, and the aperture of screen cloth is at 30~70 mm.

Further, the screen cloth has two, is the bucket form, and two screen cloth nests and sets up, is one-level screen cloth and second grade screen cloth respectively, and the second grade screen cloth is connected with the discharge end, and one-level screen cloth central authorities are provided with the screw rod, and the one-level screen cloth passes through the central bottom plate threaded connection of screw rod and second grade screen cloth.

Furthermore, the aperture of the secondary screen mesh is more than 70mm, and the aperture of the primary screen mesh is 20-30 mm.

Furthermore, the discharge end cover is composed of an inner ring grid plate and an outer ring grid plate in the radial direction, a plurality of groups of discharge grid holes are distributed on the grid plates, the grid plates are provided with holes with the width of 70mm, and the length of the holes is gradually shortened from the wide side direction of the grid plates to the narrow side direction; the part outside the position of the opening is thickened; the thickness of the long arc edge of the grid plate, which is in contact with the mill cylinder body, is lower than that of other parts, so that an inclined plane is formed; the length direction of the grid holes is approximately parallel to the radian edge of the grid plate; the opening position of a first grid hole close to the wide edge on the grid plate is opened to the outermost edge of the cylinder liner plate at the discharge end of the mill and is kept horizontal with the surface of the liner plate; the single mounting hole for fixing on the grid plate is buckled between the two mounting holes on the other plate.

Has the advantages that: the sieve can block the hard-to-grind refractory stones of 30 mm-70 mm.

Through setting up two screen cloth, one-level screen cloth and second grade screen cloth, second grade screen cloth aperture is more than 70mm, and the aperture of one-level screen cloth is at 20~30mm, can block the ore more than 70mm in the discharge end, continues to grind, collects 30mm ~70 mm's difficult obstinate stone between one-level screen cloth and second grade screen cloth, and the one-level screen cloth is dismantled through rotating the screw rod in the later stage, takes out 30mm ~70 mm's difficult obstinate stone.

The discharge end grid plate consists of an inner ring grid plate and an outer ring grid plate, the inner ring and the outer ring consist of 20 fan-shaped grid plates respectively and form a circular ring shape in an enclosing manner, and the grid plates play a role in separating coarse and fine ore particles;

the grid plate is provided with a certain number of holes with the width of 70mm, and the length of the holes is gradually shortened from the wide side direction of the grid plate to the narrow side direction; in order to increase the wear resistance of the grid plate, a certain thickness is added to the part except the position of the open hole; the thickness of the long arc edge of the grid plate, which is in contact with the mill cylinder, is slightly lower than that of other parts, so that an inclined plane is formed, and the installation and the stability are improved; in order to increase the area occupied by the sieve pores and ensure smooth ore discharge, the length direction of the grid pores is approximately parallel to the radian edge of the grid plate; the open hole position of the first grid hole close to the wide edge on the grid plate is opened to the outermost edge of the cylinder liner plate at the discharge end of the mill and is kept horizontal with the surface of the liner plate, so that low-material-level discharge is ensured; the single mounting hole for fixing on the grid plate is buckled between two mounting holes on the other plate, so that the mounting is facilitated and the area of the non-hole part is reduced. Adopt novel ore discharge grid plate, because the aperture is big (aperture 70 mm), the outmost distance of ejection of compact grid hole and material is nearly zero (level), low-order ore discharge has been realized, and grid hole area occupancy improves (outer lane grid plate grid hole area rate improves to 13%, inner circle grid plate grid hole area rate 11.5%), hole length direction and ore pulp circular motion direction form the level, it is big and smooth and easy to make its ore discharge volume, increase the bodiness reinforcing rib that improves life in the middle of the grid plate simultaneously, improve grid plate life, consequently, the big increase of mill handling capacity, manufacturing cost reduces about 30%, company's economic benefits has been improved.

Drawings

FIG. 1 is a schematic view of the present invention;

fig. 2 is a schematic view of the grid plate of the present invention;

wherein, 1, a semi-autogenous mill cylinder body; 2. a discharge end cover; 3. a grid plate; 4. a feeding end; 5. a discharge end; 6. a cylinder liner plate; 7. a first-stage screen; 8. a secondary screen; 9. inner circle grid plate grid holes; 10. outer ring grid plate grid holes; 11. and (7) installing holes.

Detailed Description

The semi-autogenous mill shown in figure 1 comprises a semi-autogenous mill cylinder 1, a discharge end cover 2, a grid plate 3, a feed end 4, a discharge end 5 and a cylinder liner plate 6, wherein a screen is arranged at the central outlet of the grid plate 3, the screen can be made into a grid shape by criss-cross metal wires or a bucket shape, holes are formed in the side wall and the bottom surface of the screen, or the screen is welded by steel bars to form a bucket frame shape.

Further, the screen cloth has two, is the bucket form, and two screen cloth nests and sets up, is one-level screen cloth 7 and second grade screen cloth 8 respectively, and second grade screen cloth 8 is connected with the discharge end, and 7 central authorities of one-level screen cloth are provided with the screw rod, and the one-level screen cloth passes through the central bottom plate threaded connection of screw rod and second grade screen cloth.

Further, the aperture of the secondary screen 8 is more than 70mm, the aperture of the primary screen 7 is 20-30 mm, the apertures are not necessarily round holes, but can also be understood as characteristic dimensions, for example, the apertures are the maximum width of the hopper frame formed by welding steel bars; the criss-cross wires are made into a grid shape, and the aperture is the length or the width of the grid.

Further, as shown in fig. 2, the discharge end cap 2 is composed of an inner ring grid plate and an outer ring grid plate in the radial direction, a plurality of groups of discharge grid holes are distributed on the grid plate, the grid plate is provided with holes with the width of 70mm, and the length of the holes is gradually shortened from the wide side direction of the grid plate to the narrow side direction; the part outside the position of the opening is thickened; the thickness of the long arc edge of the grid plate, which is in contact with the mill cylinder body, is lower than that of other parts, so that an inclined plane is formed; the length direction of the grid holes is approximately parallel to the radian edge of the grid plate; the opening position of a first grid hole close to the wide edge on the grid plate is opened to the outermost edge of the cylinder liner plate at the discharge end of the mill and is kept horizontal with the surface of the liner plate; the single mounting hole 11 for fixing on the grid plate is buckled in the middle of the two mounting holes 11 on the other plate.

The utility model discloses to original semi-autogenous mill discharge end ore discharge grid plate structure, can block 30mm ~70 mm's difficult obstinate stone through the screen cloth.

The discharging grid plate is composed of an inner ring grid plate and an outer ring grid plate in the radial direction, a plurality of groups of discharging grid holes are distributed on the grid plate, and the aperture is40mm, the occupancy of the open area is 8.5 percent, and the length direction and the pulp moving direction form 30 percent⁰The angle distribution of (1) is that the grid holes are far away from the outmost layer (material layer close to the mill cylinder) of the mill cylinder material, the structure arrangement makes the difficult-to-grind hard rock (critical particles) of 30 mm-70 mm in the semi-autogenous mill difficult to discharge, and simultaneously also hinders the quick discharge of smaller ore particles, so that the running load of the semi-autogenous mill is increased, the processing capacity is sharply reduced, the ball milling load of the second section is too small, the production technical index of the whole process is finally reduced, and the production cost is increased. Adopt novel ore discharge grid plate, because the aperture is big (aperture 70 mm), the outmost distance of ejection of compact grid hole and material is nearly zero (level), low-order ore discharge has been realized, and grid hole area occupancy improves (outer lane grid plate grid hole 10 area rate improves to 13%, inner circle grid plate grid hole 9 area rate 11.5%), hole length direction forms the level with ore pulp circular motion direction, it is big and smooth and easy to make its ore discharge volume, increase the bodiness reinforcement muscle that improves life in the middle of the grid plate simultaneously, improve grid plate life, consequently, the mill handling capacity greatly increases, manufacturing cost reduces about 30%, company's economic benefits has been improved.

Claims

1. A semi-autogenous mill comprises a semi-autogenous mill cylinder, a discharge end cover, a grid plate, a feed end, a discharge end and a cylinder liner plate, and is characterized in that a screen is arranged at the central outlet of the grid plate.

2. The semi-autogenous mill of claim 1, wherein the screen cloth has two, is bucket-shaped, and two screen cloth nests and sets up, is first order screen cloth and second grade screen cloth respectively, and the second grade screen cloth is connected with the discharge end, and the screw rod is provided with in the middle of the first order screen cloth, and the first order screen cloth passes through screw rod and the central bottom plate threaded connection of second grade screen cloth.

3. The semi-autogenous mill of claim 2, wherein the secondary screen mesh has a pore size of more than 70mm, and the primary screen mesh has a pore size of 20-30 mm.

4. A semi-autogenous mill according to any one of claims 1 to 3, characterized in that the discharge end cap is composed of an inner ring grid plate and an outer ring grid plate in the radial direction, a plurality of groups of discharge grid holes are distributed on the grid plate, the grid plate is provided with holes with width of 70mm, and the length of the holes is gradually shortened from the wide side direction of the grid plate to the narrow side direction; the part outside the position of the opening is thickened; the thickness of the long arc edge of the grid plate, which is in contact with the mill cylinder body, is lower than that of other parts, so that an inclined plane is formed; the length direction of the grid holes is approximately parallel to the radian edge of the grid plate; the opening position of a first grid hole close to the wide edge on the grid plate is opened to the outermost edge of the cylinder liner plate at the discharge end of the mill and is kept horizontal with the surface of the liner plate; the single mounting hole for fixing on the grid plate is buckled between the two mounting holes on the other plate.