A control circuit for preventing a crane from being tilted

Abstract

The utility model discloses a control circuit that prevents crane skewing and oblique hoisting, and it is characterized by: including detection control circuit, intermediate control circuit, lifting hook ascending control circuit and alarm circuit, the detection control circuit series connection has laser photoelectric switch and time delay relay K01, the intermediate control circuit series connection has the normally open contact of time delay relay K01 and relay K02, the lifting hook ascending control circuit series connection has lifting hook ascending control switch, the normally open contact of relay K02 and contactor coil KM1, the alarm circuit series connection has alarm and the normally closed contact of relay K02, the utility model discloses laser photoelectric switch plus laser reflector plate realizes crane immobile wire rope inclination detection, and cooperates control circuit to realize the function of alarm and cut off ascending circuit, ensures crane safe operation, and system installation is simple, and the reliability is high, is suitable for all crane additional installation.

Description

Technical Field

[0001] This utility model relates to the field of crane control technology, specifically a control circuit for preventing cranes from pulling or lifting at an angle. Background Technology

[0002] As an indispensable special equipment in the industrial field, the safety of cranes is the most critical indicator. Sometimes, operators, in pursuit of efficiency, begin to load the object before the crane hook has reached directly above it. This results in uneven lifting, which can lead to uneven stress on the crane, causing metal structure deformation, weld cracking, wire rope wear, and wire rope slippage on the drum, among other safety accidents. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a control circuit to prevent cranes from tilting or hoisting at an angle. It uses a laser photoelectric switch and a laser reflector to detect the tilt of the wire rope when the crane is stationary, and works with the control circuit to realize the functions of alarm and cutting off the lifting circuit, so as to ensure the safe operation of the crane. The system is easy to install, highly reliable, and suitable for installation on all cranes. It can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a control circuit for preventing cranes from pulling or lifting at an angle, characterized in that it includes a detection control circuit, an intermediate control circuit, a hook lifting control circuit, and an alarm circuit; The detection and control circuit is connected in series with a laser photoelectric switch and a time delay relay K01; The intermediate control circuit is connected in series with the normally open contact of time delay relay K01 and relay K02; The hook lifting control circuit is connected in series with a hook lifting control switch, a normally open contact of relay K02, and a contactor coil KM1; The alarm circuit is connected in series with the normally closed contact of the alarm and relay K02.

[0005] Preferably, the laser photoelectric switch is tilted and fixed below the trolley frame, and a laser reflector corresponding to the laser photoelectric switch is installed on the stationary steel wire rope of the crane.

[0006] Preferably, the laser reflector is circular.

[0007] Compared with the prior art, the advantages of this utility model are: the use of a laser photoelectric switch and a laser reflector to detect the tilt of the stationary wire rope of the crane, and the use of a control circuit to realize the functions of alarm and cutting off the lifting circuit, ensuring the safe operation of the crane. The system is easy to install, highly reliable, and suitable for installation on all cranes. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the circuit control principle of this utility model; Figure 2 This is a schematic diagram showing the installation positions of the laser photoelectric switch and laser reflector of this utility model.

[0009] In the diagram: 1. Detection control circuit, 2. Intermediate control circuit, 3. Hook lifting control circuit, 4. Alarm circuit. Detailed Implementation

[0010] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0011] Please see Figure 1-2 This utility model provides a technical solution: a control circuit to prevent a crane from pulling or lifting at an angle, including a detection control circuit 1, an intermediate control circuit 2, a hook lifting control circuit 3, and an alarm circuit 4; The detection control circuit 1 is connected in series with a laser photoelectric switch and a time delay relay K01; The intermediate control circuit 2 is connected in series with the normally open contact of the time delay relay K01 and the relay K02; The hook lifting control circuit 3 is connected in series with the hook lifting control switch, the normally open contact of relay K02, and contactor coil KM1; Alarm circuit 4 has the normally closed contact of the alarm and relay K02 connected in series; Under normal circumstances, when the laser photoelectric switch has an action output, the time-delay relay K01 of its detection control circuit 1 is activated, the normally open contact of the time-delay relay K01 of the intermediate control circuit 2 is closed, and relay K02 is activated. Then, the normally open contact of the relay K02 of the hook lifting control circuit 3 is closed. When the hook lifting control switch is pressed, the contactor coil KM1 is energized and activated. At this time, the hook lifting control circuit 3 is connected, and the hook can rise normally. At the same time, the alarm circuit 4 is disconnected. When the laser photoelectric switch does not receive a feedback signal, the time delay relay K01 is disconnected, and the time delay relay K02 is disconnected after a delay (the delay time can be set). The hook lifting control circuit 3 is cut off, the lifting stops, the alarm circuit 4 is connected, and an alarm prompt message is issued. It should be noted that the use of time-delay relays is designed to prevent the system alarm from being triggered briefly due to factors such as hook swaying. Furthermore, the laser photoelectric switch is tilted and fixed below the trolley frame, and a laser reflector corresponding to the laser photoelectric switch is installed on the stationary steel wire rope of the crane, so that the laser can accurately hit the reflector. It should be noted that the size of the laser reflector should be appropriate and it should be made into a circle. The radius of the circular reflector can be calculated from the maximum allowable tilt angle on site.

[0012] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents in the content of this utility model.

Claims

1. A control circuit for preventing a crane from being slanted by a slanted hoisting, characterized by: It includes a detection control circuit (1), an intermediate control circuit (2), a hook lifting control circuit (3), and an alarm circuit (4). The detection control circuit (1) is connected in series with a laser photoelectric switch and a time delay relay K01; The intermediate control circuit (2) is connected in series with the normally open contact of the time delay relay K01 and the relay K02; The hook lifting control circuit (3) is connected in series with the hook lifting control switch, the normally open contact of the relay K02 and the contactor coil KM1; The alarm circuit (4) is connected in series with the normally closed contacts of the alarm and relay K02.

2. The control circuit for preventing cranes from pulling or lifting at an angle according to claim 1, characterized in that: The laser photoelectric switch is tilted and fixed below the trolley frame, and a laser reflector corresponding to the laser photoelectric switch is installed on the stationary steel wire rope of the crane.

3. A control circuit for preventing a crane from being lifted at an angle according to claim 2, characterized in that: The laser reflector is circular.

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