Special control circuit for sand box door

Abstract

The invention discloses a special control circuit for a sand box door. The special control circuit comprises a rectifier bridge Q, a resistor R1, a capacitor C1, a relay J, a switch K, a transistor VT1, and an infrared reflection detection module U1. One end of the resistor R1 is connected to the capacitor C1, a relay J contact J-1, and one end of 220V alternating current. The other end of the relay J contact J-1 is connected to a sand box controller, the other end of the sand box controller is connected to the switch K, and the other end of the switch K is connected to the other end of the 220V alternating current and a rectifier bridge Q pin 4, a rectifier bridge Q pin 1 is connected to a resistor R3, a capacitor C2, a relay J coil, the negative electrode of a diode D2, and the positive electrode of the light emitting diode LED. According to the special control circuit for a sand box door, a mode of infrared control is used, whether a human body approaches the sand box door can be automatically sensed, thus the sand box door is opened or closed, in addition, the switch K plays a role of manual opening and closing, and the special control circuit has the advantages of a simple structure, low cost and a small size and is very suitable for promotion and use.

Description

technical field [0001] The invention relates to a sand box door, in particular to a special control circuit for the sand box door. Background technique [0002] The sand box is used in the construction of steel pipe pile support cast-in-place beams for unloading purposes. When the steel pipe pile support Bailey beam is erected, the construction of the cast-in-place beam will start. After the cast-in-place beam construction is completed, the support needs to be removed. At this time, it is difficult to remove the support, because the weight of the beam body is all pressed on the support. It is not an easy task, which requires us to set up a sand box between the steel pipe pile and the distribution beam in advance when making the support, and the sand box acts as a jack. [0003] During the operation of the sand box, manual operation is often required. The existing sand box door can only be controlled manually, and cannot sense the operating state of the human body, thereby a...

AI Technical Summary

Problems solved by technology

[0003] During the operation of the sand box, manual operation is often required. The existing sand box door can only be controlled manually, and cannot sense the operating state of the human body, so as to automatically control the opening and closing of the sand box door.

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