Mineral sizers is a kind of graded high-efficiency large-capacity mineral sizers widely used in coal, mining, building materials and other industries. Because of its large torque, it has very high requirements for the bearing connection. Our company has specially developed a drum coupling for this purpose, which adopts the form of safety pin connection. It can solve the phenomenon of broken shaft caused by excessive torque.
The drum-toothed coupling responsible for the power transmission between the reducer and the crushing roller is an important part of the double-toothed rod grading mineral sizers, and its work is reliable. Strong carrying capacity. With a small amount of compensation performance. Meet the conditions for mineral sizers. However, there are still many shortcomings in the ease of use and the security of the whole system, and it is urgent to improve it. The nominal torque and dimensions of the drum gear coupling are designed according to the B/ T88542-1999 standard GⅡCL drum gear coupling, and the shaft is mostly made of involute spline holes.
Analysis of existing problems
Many maintenance items, low efficiency mineral sizers In the working state, the coupling is subjected to a large temporary impact load. Running for a long time makes the coupling outer sleeve coupling bolt loose or even damaged. During regular maintenance, the coupling bolts must be checked in time. If there is any missing inspection or maintenance is not timely, the coupling may fail or even be damaged, and eventually lead to an accident stop. Drum gear coupling has many fault points, long maintenance time and high maintenance cost.
When the factory test is not convenient for daily maintenance, it is necessary to turn the tooth roller to check the meshing of the synchronous gear of the coupling. If the bite is not up to standard, it is necessary to repair the back ear for test until the design requirements are met: In the process of regular maintenance, the user also needs to turn the crushing roller to check whether there are broken teeth, loosening, tooth falling off and tooth plate cracking and other faults, and quickly strengthen the parts, replace or repair welding, although the hydraulic coupler can be regarded as disconnected in the case of speed failure or oil discharge. However, the gear roller is directly connected with the output shaft of the reducer, and the gear roller is rotated. The reducer becomes an accelerator, which increases the difficulty of the tooth roll rotation. Only remove the coupling bolt of the outer gear sleeve to separate the reducer from the crushing shaft. To turn the crushed roller smoothly. Due to the numerous daily maintenance and repeated dismantling, it is not conducive to the rapid maintenance work. During the maintenance process, especially the maintenance of the crushing chamber, because the connection between the output shaft of the reducer and the crushing shaft is not separated, if it is suddenly started at this time, the crushing roller will directly obtain power rotation, resulting in a major accident, and there are heavy safety risks after the oil discharge, although the hydraulic coupler can also completely cut off the power. However, in order to save maintenance time, basically no oil discharge operation will be carried out on the cake mixer.
The mineral sizers drum gear coupling was changed to clutch type drum gear coupling, and the split gear set of the original bolted connection was changed to an integral gear sleeve. The tooth sleeve can slide back and forth along the axis of the shaft sleeve, and the sliding distance is B. The integral gear sleeve meshes with the left and right shaft sleeves to complete power transmission. If the integrated gear sleeve is slid to the left until the sliding distance is B.(≥A), the integrated gear is still engaged with the left shaft sleeve, but is detached from the right shaft sleeve. The improved clutch type drum tooth coupling has the dual functions of coupling and clutch, which can realize power transmission and height distribution conveniently and quickly. In order to match the use of the new coupling, the connecting rod mechanism as shown in Figure 4 is designed. The bearing assembly 6 is fixed on the connecting rod bracket 5, and the bearing outer ring rolls between C when the coupling rotates. The connecting rod bracket 5 is fixed on the connecting rod base 4, and can be rotated with the axis as the center, and the handle 2 is connected with the bracket 5 by a key. Use the handle fixing pin 7 to fix the handle fixing base 1. At this time, the overall gear sleeve connects the left and right shaft sleeve to achieve power transmission: lower the handle, fix it in the lower pin hole, and the overall gear sleeve moves left under the drive of the connecting rod. Detach the right shaft sleeve to achieve power separation.
The Mineral sizers outer gear sleeve is changed from split to integral, which reduces the point of failure, simplifies the overhaul project, shortens the overhaul time and reduces the maintenance cost. In the process of test inspection and daily maintenance of the user, if the crushing roller needs to be rotated, the connecting rod mechanism can be controlled to separate the crushing shaft from the reducer. Quick inspection or routine maintenance reduces production cycles at mineral sizers manufacturers. It also reduces the user's daily maintenance costs and repair time. Increased mechanical separation protection, so that the shutdown inspection and maintenance with power off, mechanical separation of the double protection, eliminating safety hazards