CN-121972263-A - Discharge bushing assembly capable of adjusting filling rate of mill

CN121972263ACN 121972263 ACN121972263 ACN 121972263ACN-121972263-A

Abstract

The invention relates to a discharging bushing assembly capable of adjusting the filling rate of a mill, which is designed into a split type assembly structure and mainly comprises a hollow shaft protection device, a filling rate-adjustable bushing and a double-flange end connection device, wherein the inner diameter of the hollow shaft of a large-scale ball mill is adapted, the inner diameter of the discharging bushing is effectively reduced, so that the medium filling rate is improved, the production efficiency is improved, meanwhile, the split type structure is convenient to detach and replace, so that the maintenance cost of equipment is reduced.

Inventors

WU HANQI
TANG BILIANG
HE YUNFENG
ZHOU JIE
HAN CHUNYANG
GAO XIUJUAN
XIE HUAHUA
CHEN YANZHENG

Assignees

中信重工机械股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260227

Claims (10)

1. The utility model provides a discharge bush subassembly of adjustable mill filling rate, its characterized in that, discharge bush subassembly includes cavity axle protection device, adjustable filling rate bush and double flange short circuit device, cavity axle protection device passes through tang cooperation at the inner, the outer end passes through bolted connection and is fixed in the discharge end cover, adjustable filling rate bush passes through conical surface cooperation and tang location at the inner, passes through the coaxial setting of bolted connection inside cavity axle protection device at the outer end, double flange short circuit device's both ends configuration double flange, one end and cavity axle protection device's outer end bolted connection, the other end and discharge gate part bolted connection.
2. The adjustable mill packing fraction discharge liner assembly of claim 1 wherein the adjustable packing fraction liner is cylindrical and the inner diameter of the adjustable packing fraction liner is adjustable while ensuring that the inner end taper surface matches the taper surface on the hollow shaft protector.
3. The discharge bushing assembly with adjustable mill filling rate of claim 1, wherein the reverse spiral is arranged on the inner wall of the adjustable filling rate bushing, so that the overflow of massive materials and medium balls can be effectively prevented.
4. The adjustable mill filling rate discharge liner assembly of claim 1, wherein a space is left between the outer cylinder wall of the hollow shaft protection device and the hollow shaft inner wall of the discharge end cap, and the adjustable mill filling rate discharge liner assembly can contain leaked ore pulp and play a buffering role when the sealing fails, so that the ore pulp is prevented from directly wearing the hollow shaft inner wall.
5. The adjustable mill filling rate discharge liner assembly of claim 4, wherein the hollow shaft protector has a plurality of emergency slurry discharge ports evenly disposed on the wall of the hollow shaft protector.
6. The adjustable mill filling rate discharging bushing assembly according to claim 1, wherein the cross section of the hollow shaft protection device is of an I-shaped like structure, an inner conical surface is arranged on the inner side surface of the inner end of the I-shaped like structure, and the inner conical surface is in press fit with an outer conical surface on the outer side surface of the inner end of the adjustable filling rate bushing to form a conical surface sealing effect.
7. The adjustable mill packing fraction discharge bushing assembly of claim 1, wherein a sealing strip is provided at an inner end spigot of the hollow shaft protector, the adjustable packing fraction bushing and the hollow shaft protector are sealed at the inner end by a conical surface and an O-ring is provided at the spigot of the adjustable packing fraction bushing.
8. The adjustable mill filling rate discharge liner assembly of claim 7, wherein the sealing strip is a chlorine Ding Ruan rubber material.
9. The adjustable mill packing fraction discharge liner assembly of claim 1 further comprising a man-machine interface capable of automatically calculating the mill packing fraction and displaying relevant parameters based on the mill barrel effective inner diameter and the adjustable packing fraction liner spiral inner diameter.
10. The adjustable mill filling rate discharge liner assembly of claim 1, wherein the mill maximum filling rate calculation method comprises: wherein: , J t represents the filling rate, unit, d 3 represents the spiral inner diameter of the lining with adjustable filling rate, d represents the effective inner diameter of the mill cylinder, The unit is radian.

Description

Discharge bushing assembly capable of adjusting filling rate of mill Technical Field The invention belongs to the technical field of ore grinding equipment, and particularly discloses a discharging bushing assembly capable of adjusting the filling rate of a mill. Background The mill feeding and discharging bushing is usually positioned in a hollow shaft at the feeding and discharging end of the mill and used as a protective lining layer of an inner pipe of the hollow shaft for preventing mediums such as ore, steel balls, running water and the like from scouring and wearing the inner diameter of the hollow shaft so as to damage equipment, the discharging bushing is usually cylindrical or micro-conical, and is generally of an integrated structure and is closely installed in the hollow shaft at the discharging end, and once the inner diameter of the hollow shaft is determined, the inner diameter of the discharging bushing is basically fixed. In the process of grinding, a grinding machine mainly completes a grinding task by the action of a medium, the medium filling rate of a grinding machine is a main parameter in a grinding loop, and the insufficient action of the grinding medium in the grinding machine can be caused by the too low medium filling rate, so that the productivity is reduced. Along with the large-scale development of grinding equipment, the main bearing of the mill is larger and larger in specification, and the inner diameter of the hollow shaft is increased, so that the inner diameter of the discharge bushing is also increased, the discharge bushing is overlarge in inner diameter, the ball discharge phenomenon of the ball mill can be caused, the medium filling rate is reduced, and the production efficiency is influenced. In order to improve the medium filling rate, patent CN201910605542.4, a discharging device capable of improving the ore grinding medium filling rate of an overflow ball mill, a method for improving the medium filling rate by adding a ball baffle plate between a discharging cylinder and a mill cylinder screen is provided, but the ball baffle plate is perpendicular to the medium overflow direction, is subjected to the scouring abrasion effect, has a short service life, and the existence of the ball baffle plate easily causes the medium to be accumulated at the lining of the discharging cylinder so as to accelerate the abrasion of the discharging lining. In addition, the discharge bushing is installed at the discharge end of the mill, and frequent scouring of medium and ore pulp is born in the work, and is easy to wear, and traditional discharge bushing is of an integrated structure, and the traditional discharge bushing is required to be completely disassembled for replacement after being damaged, so that the operation time is long, and the maintenance cost is high. The sealing mode between traditional ejection of compact bush and the cavity axle is terminal surface and compresses tightly +O type circle and seal, sets up O type circle groove at ejection of compact bush and end cover junction promptly, compresses tightly through the bolt and realizes sealedly, but because rigidity to rigid contact, little assembly error or heat altered shape can lead to sealed inefficacy, and traditional bush easily takes place elastic deformation under the high-pressure ore pulp effect, destroys sealed cooperation precision, causes vibration and leakage, in case leak, can directly wear the cavity axle, damage equipment, causes the loss. The problems are solved, so that the traditional hollow shaft discharging bushing can not meet the requirements of high filling rate and high reliability of a large-scale mill, and the development of large-scale intellectualization of the mill is restricted. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a discharging bushing assembly capable of adjusting the filling rate of a grinding machine, which is used for solving the defects of low filling rate of a fixed discharging bushing of the existing grinding equipment and supporting the large-scale intelligent development of the grinding machine. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The utility model provides an adjustable mill filling rate's ejection of compact bush subassembly, ejection of compact bush subassembly includes cavity axle protection device, adjustable filling rate bush and double flange short circuit device, cavity axle protection device passes through tang cooperation at the inner, the outer end passes through bolted connection and is fixed in ejection of compact end cover in, adjustable filling rate bush passes through conical surface cooperation and tang location at the inner, passes through bolted connection coaxial setting inside cavity axle protection device at the outer end, double flange short circuit device's both ends configuration double flange, one end and cavity axle protection device's o