The mechanical seal grinder is controlled by stepless speed regulation system, which can easily adjust the grinding speed suitable for grinding various parts. The closed-loop feedback pressure control of electric pneumatic proportional valve is adopted, and the pressure device can be adjusted and controlled independently. The hanging wall is equipped with slow lowering function to effectively prevent the crushing of thin and brittle workpieces. Through a time relay and a grinding counter, the grinding time and the number of grinding circles can be accurately set and controlled according to the processing requirements. When working, the pressure mode can be adjusted. When the grinding set time or lap speed is reached, it will automatically stop and give an alarm, so as to realize semi-automatic operation.
In the variable speed control method of mechanical seal grinder, the grinding process has three stages, namely, the start stage, the formal stage and the end stage. In the start stage, the abrasives rotate at a higher speed, in the formal stage, the abrasives rotate at a constant speed and in the end stage, the Abrasives rotate at a lower speed. It is characterized in that in the start stage of grinding process, the acceleration of artificially controlling the abrasives speed increases from zero to fast, When the abrasive speed rises to half of the formal grinding speed, there is an inflection point in the change of acceleration. The acceleration controlling the abrasive speed decreases from fast to slow from the maximum value until the abrasive speed reaches the formal grinding speed, and the acceleration of abrasive speed decreases to zero.
Using the characteristics of fixed abrasive grinding, according to the relative motion track density distribution between workpiece abrasives, the abrasive density distribution on abrasives is reasonably designed, so that the wear of abrasives in the grinding process does not affect the surface accuracy of abrasives, so as to significantly improve the surface accuracy of workpieces and avoid the trouble of dressing abrasives. In plane fixed abrasive grinding, the rotational motion of the abrasive is the main motion and the motion of the workpiece is the auxiliary motion. In most cases, the workpiece is floating and pressed on the abrasive tool, and its motion law is unknown. Therefore, the stress state and motion law of the workpiece can be obtained only by analyzing the stress of the workpiece. Take the workpiece as the separate body of the whole grinding system, establish the differential equation of force balance of the workpiece, and solve the equation to obtain the motion law of the workpiece.
The main machine of the mechanical seal grinder is driven by a speed regulating motor, equipped with a high-power deceleration system, soft start, soft stop and stable operation. Through the upper and lower grinding discs, sun wheel and star wheel, the grinding movement with four directions and speeds coordinated with each other is formed during processing, so as to achieve the efficient operation of simultaneous grinding of the upper and lower surfaces. The lower grinding plate can be lifted and lowered to facilitate workpiece loading and unloading. The pneumatic sun wheel direction changing device can accurately control the grinding accuracy and speed on both sides of the workpiece. A correction wheel is equipped randomly to correct the parallelism error of the upper and lower grinding discs.
The grinding basket type mechanical seal grinder inherits the characteristics that the two processes of decentralized grinding of the basket type mechanical seal grinder are realized on one machine and one process. At the same time, it can also be used alone as a disperser (when the disperser is in the working position and the grinding basket is not lowered). For the materials to be ground, the function of dispersing first and then grinding can be realized (when the grinding basket drops to the working position, the materials can be finely ground with high efficiency).