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Solve the malfunction of solenoid valve

After finding out the problem with the logic valve, consider that if the valve is redesigned, not only the cycle will be long, but also the cost of the product will be greatly improved. In order to shorten the development time of the product and save the cost, we finally decided to adopt the “exclusive” method to solve this problem. The title does not change the structure of the logic valve. Re-install the three-way joints on the six control ports of the valve, and then lead out six pipelines and connect two sets of three-way one-way valves, and then make the two through the three-way check valve. The lines are respectively connected to two unloading solenoid valves. The two unloading solenoid valves have the same function as the unloading solenoid valves on the logic valve, that is, the overload relief solenoid valve and the overhead relief solenoid valve.

According to the principle diagram, before the torque limiter provides an electrical signal to the unloading solenoid valve, the unloading solenoid valve is in a normally-off state, ie, the unloading loop is opened, and once the torque limiter provides an electrical signal to it, the unloading solenoid The valve is energized to achieve commutation, and the unloading circuit is opened. The jaw crusher destroys the machine. To this end, the pipeline (T1) on the side of the logic valve is disconnected, and then when it is manipulated, it is found that when the torque limiter does not issue an instruction, The overloaded unloading solenoid valve Y1 is without electricity, the solenoid valve is not commutated, and no pressure oil flows out. When the machine enters an overload condition, the valve is energized and hydraulic oil flows out of the pipeline.

Therefore, the inspection of the circuit and the liquid circuit is aimed at checking whether the torque limiter and the limit switch can transmit the electric signal to the unloading solenoid valve at the same time that the panel indicator light alarm signal is provided. If possible, the unloading circuit will be switched on for safe unloading. Otherwise, the safe unloading will fail.

Tracked mobile crushers often use a pilot-controlled hydraulic system to operate quietly and well-behaved. This system uses the way of safe unloading of the pilot control oil to prevent possible dangerous conditions, such as main and auxiliary lift hoisting overload or truss arm over-amplitude, the principle is through the torque limiter, overload The combined action of the unloading solenoid valve and the logic valve or limit switch, the overhanging relief solenoid valve, and the logic valve ensures that the safe unloading can be reliably performed when an overload or overrunning operation is performed, and the occurrence of an accident is prevented.

Check the circuit and then check the circuit, first check the layout, there is no throw up error, the final attention will be focused on the logic valve, suspected logic valve check valve spring harder or smaller valve diameter, so that The back pressure of the unloading oil circuit is relatively large, resulting in the unrestricted unloading oil path. The unloading problem then measures the pressure of the corresponding an or bn port in an alarm state. It is found that the pressure is about 1 MPa, while the main valve only needs about 0. The pilot pressure of .6 MPa can be turned on, confirming the accuracy of the suspicion, just because the back pressure in the logic valve is large, which causes the unloading problem. This shows that the procedure for the logic command issued by the torque limiter is normal, and that the work of the unloading solenoid valve is also the same as normal. When the limit switch for controlling the undiding load and the unloading solenoid valve Y2 are checked, the work is also normal. Therefore, the possibility of circuit failure hammer mill is eliminated.

Moreover, the two unloading solenoid valves and the two unloading solenoid valves on the logic valve form a parallel relationship on both the circuit and the hydraulic circuit, constituting two groups of solenoid valves that all have the same protection function, once the torque limiter or limit The switch sends out an electric signal, and the parallel unloading solenoid valve group with the same function will be commutated at the same time to ensure normal unloading, and quickly intercept the main oil circuit so that the mobile crusher can no longer inherit under dangerous conditions such as overloading or overrunning. Working stone crusher prices.

A tracked mobile crusher found out during the trial process that during the trial process, when an overload or overwork lesson was performed, the indicator light on the operation panel was alarmed, but the controls could still be inherited, indicating its safety. The safe unloading of the protection device fails.

Analysis of this problem, the failure of the electrical system or hydraulic system, can lead to a safe unloading failure spiral classifier.

After the improvement test, the effect is very good. When the panel indicator alarms, the overloaded homework or the overwork work cannot be inherited, achieving the purpose of security protection.

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