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ContactIs a professional manufacturer of construction machinery integrating research and development, manufacturing, sales, installation and after-sales service.
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ProductsContactIs a professional manufacturer of construction machinery integrating research and development, manufacturing, sales, installation and after-sales service.
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ContactIs a professional manufacturer of construction machinery integrating research and development, manufacturing, sales, installation and after-sales service.
Fault Analysis and Handling of No Signal from the Discharge Door of the Mixer
During the concrete production process, the normal operation of the discharge door of the mixer is of vital importance. However, sometimes, after the material is unloaded, although the discharge door is closed, there is no door-closed signal, causing the program to stop running. This failure not only affects production efficiency but may also disrupt the entire production process.
Jun 06,2025
During the concrete production process, the normal operation of the discharge door of the mixer is of vital importance. However, sometimes, after the material is unloaded, although the discharge door is closed, there is no door-closed signal, causing the program to stop running. This failure not only affects production efficiency but may also disrupt the entire production process.
Upon in-depth investigation of the causes, the core problem lies in the sensing relationship between the proximity switch of the discharge door and the handle pointer. The proximity switch can only normally sense and output a signal when the distance between it and the handle pointer does not exceed 5mm. When the oil pump pressure of the discharge door fails to meet the standard requirement of 13MPa, the discharge door cannot be fully closed, making it difficult for the proximity switch to sense the signal. When the discharge door is closed, if it is blocked by the residual concrete in the mixer, it will also prevent the two from reaching an effective sensing distance. In addition, once the proximity switch or the handle pointer becomes loose, causing the distance to exceed 5mm, the signal sensing will fail. Worse still, if the proximity switch itself is damaged, it will completely lose its signal output ability.
To address these issues, the handling process needs to be carried out step by step. First, use professional tools to detect the working pressure of the hydraulic system of the discharge door and confirm whether it reaches 13MPa. If it does not meet the standard, adjust the oil pump pressure in a timely manner. Then, switch the equipment to manual mode, carefully open the discharge door to allow the blocked residual materials to fall off smoothly, and then close the discharge door again. Subsequently, carefully check the fixing condition of the proximity switch and the handle pointer. If there is any looseness, tighten and reinforce them immediately. Finally, use testing instruments such as a multimeter to determine whether the proximity switch is damaged. If it is damaged, replace it with a new one.
The troubleshooting and handling of the no-signal fault of the mixer's discharge door require a rigorous attitude and professional methods. Only by accurately identifying the root cause of the fault and resolving it properly can the stable operation of the mixer be ensured.
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