In recent years, with the expansion of mineral sizers in the coal, mining, construction, chemical and other fields, mineral sizers also break some wet or hard materials. As we all know, mineral sizers have two meshing tooth rollers. When hard objects such as non-crushing materials enter the crushing chamber, it will lead to overload operation of the motor or reducer, which will cause irreversible damage such as motor burning and reducer teeth beating. To this end, a mineral sizers speed measuring device is designed and developed. When the tooth roller encounters the hard object jam, the power is cut off and the machine is stopped in time, and the human intervention is carried out, so as to ensure the safe and efficient operation of the crusher, and realize the purpose of saving maintenance work and stopping time. In order to solve the technical problems existing in the well-known technology, a mineral sizers speed measuring device is designed. When the tooth roll hits the hard object jam, it can automatically power off and stop, and then human intervention is carried out to ensure the safe and efficient operation of the crusher, and realize the purpose of saving maintenance work and stopping time. The purpose is to provide a mineral sizers speed measuring device comprising two tooth rolls, a crusher case and a frame, comprising at least: a first speed measuring member for detecting the speed of the first tooth roll: The first speed measuring component comprises a first sensing object installed on the non-center position of the first rotating shaft, a first proximity switch fixed on the frame, and a first signal receiver for receiving the output signal of the first proximity switch: the minimum distance between the first sensing object and the first proximity switch is less than the induction distance of the first proximity switch: the first tooth roller is installed on the first rotating shaft: The first proximity switch is connected with the first signal receiver through a data line: the second speed measuring component is used to detect the speed of the second tooth roller: the second speed measuring component comprises a second induction object installed on the second rotating shaft non-center position, a second proximity switch fixed on the frame, and a second signal receiver for receiving the output signal of the second proximity switch: The minimum distance between the second inductive object and the second proximity switch is less than the induction distance of the second proximity switch: the second tooth roller is installed on the second rotating shaft: the second proximity switch is connected with the second signal receiver through the data line; Where: the first sensing object and the first proximity switch have at least one circular arc: the second sensing object and the second proximity switch have at least one circular arc: the controller of the mineral sizers is connected with the first signal receiver and the second signal receiver respectively through a data line. The first inductive object is a circular arc metal sheet, the first inductive object is connected with the first rotating shaft through a bolt, and the signal receiving surface of the first proximity switch is a circular arc. The signal receiving surface of the first proximity switch is circular arc: the first inductive object is a bolt, and the first inductive object is connected with the first rotating shaft through a thread. The second inductive object is a circular arc metal sheet, the second inductive object is connected with the second rotating shaft through a bolt, and the signal receiving surface of the second proximity switch is a circular arc.
Two sets of speed measuring components are used to measure the speed of two tooth rollers respectively, each speed measuring component includes an induction object and a proximity switch. The induction object and proximity switch used in this application have at least one circular arc, so in the process of working near the switch, the received signal has a duration T, the size of the time T depends on the arc length of the circular arc and the speed of the shaft: The longer the arc length of the circular arc or the slower the speed, the longer the duration T, and conversely, the shorter the duration T. In actual use, the desired duration T can be obtained by reasonably selecting a circular component of appropriate length based on the required rotational speed. In actual operation, when the duration of the detection signal received by the proximity switch is greater than or less than the duration T, the proximity switch sends a stop signal to the mineral sizers controller through the signal receiver. This prevents the failure from continuing or growing.