Walking safety warning and protecting device for hoisting crane

Abstract

The utility model aims to provide a walking safety warning and protecting device for a hoisting crane, which aims at solving the problem that potential safety hazards are easy to form when the hoisting crane walks and runs. According to the technical scheme, the walking safety warning and protecting device for the hoisting crane comprises a proximity switch, a conductor installed on a conductor installation support and corresponding to the proximity switch, and an audible and visual alarm located on the hoisting crane. And the audible and visual alarm and the hoisting crane power box are connected with the proximity switch through circuits. According to the device, the lifting crane can be automatically stopped when walking to a set dangerous area, safety warning is carried out, the lifting crane can continue to walk only when an operator in the dangerous area confirms permission, and therefore the operator in the dangerous area can achieve active self-protection.

Description

Technical Field

[0001] This utility model belongs to the field of safety early warning and protection, and specifically relates to a safety warning and protection device for crane travel. Background Technology

[0002] Cranes, including bridge cranes and electric hoist cranes, are commonly used maintenance and lifting equipment. There are many equipment and facilities near the crane's direction of travel, and the operation of these facilities often creates some overlap with the crane's movement.

[0003] Due to issues such as noise, lighting, and line of sight at the site, it is not easy for the staff involved in the above-mentioned cross-operations to communicate in a timely and comprehensive manner. This makes it easy for safety hazards to arise when the crane is moving, especially the crane cab or hook, which can easily cause injuries or equipment accidents such as scratches or crushes to other workers. Summary of the Invention

[0004] The purpose of this invention is to address the safety hazards that can easily arise when cranes are in motion, and to provide a crane movement safety warning and protection device. This device can automatically stop the crane and issue a safety warning when it reaches a designated danger zone. The crane can only continue moving after the operator in the danger zone confirms and gives permission, thus enabling the operator in the danger zone to proactively protect themselves.

[0005] The technical solution of this utility model is a crane travel safety warning and protection device, including a proximity switch, a conductor installed on a conductor mounting bracket and corresponding to the proximity switch, and an audible and visual alarm located on the crane.

[0006] The proximity switch is located at the bottom of the crane cab or hook. The conductor is located outside the dangerous area within the crane's travel range, and the conductor is positioned higher than the highest point of the equipment or personnel in the dangerous area. The dangerous area is the work area where the work position is close to the crane cab or hook. The audible and visual alarm and the crane power supply box are connected to the proximity switch via a circuit.

[0007] Furthermore, in the aforementioned crane travel safety warning and protection device, there are two proximity switches;

[0008] Furthermore, in the aforementioned crane travel safety warning and protection device, the proximity switch is either photoelectric or inductive.

[0009] Furthermore, in the aforementioned crane travel safety warning and protection device, there are two conductors, and the direction of the line connecting the two conductors is consistent with the travel direction of the crane.

[0010] Furthermore, in the aforementioned crane travel safety warning and protection device, the conductor is installed at a height lower than the proximity switch, and the height difference between the conductor and the proximity switch is within the effective distance of the proximity switch.

[0011] Furthermore, in the aforementioned crane travel safety warning and protection device, the open contacts of the two proximity switches are connected in parallel and then connected in series with two parallel intermediate relays KA1 and KA2. The normally closed contact of relay KA1 is connected in series with the coil of the crane power supply box's traveling contactor KM1, and the normally open contact of relay KA2 is connected in series with the coil of the alarm contactor KM2.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] 1. This device is designed so that it will activate when any proximity switch is within the effective distance of the conductor, triggering two intermediate relays, which in turn disconnects the crane power supply to stop the crane, and simultaneously activates the alarm power supply, thus starting the crane alarm device.

[0014] 2. This device can ensure the safety of personnel working in dangerous areas below and near the direction of travel of the crane. Attached Figure Description

[0015] Figure 1 A schematic diagram of the installation position of the device of this utility model;

[0016] Figure 2 The circuit diagram of the device of this utility model.

[0017] Among them, 1. Crane, 2. Proximity switch, 3. Conductor, 4. Conductor mounting bracket, 5. Hazardous area, 6. Crane power supply box, and 7. Proximity switch power supply. Detailed Implementation

[0018] Example

[0019] A travel safety warning and protection device for a crane 1, such as Figure 1 and Figure 2 As shown, it includes two proximity switches 2, namely proximity switch A and proximity switch B, two conductors 3, conductor A and conductor B, which are mounted on the conductor mounting bracket 4 and are corresponding to the proximity switches, as well as an audible and visual alarm and a crane power supply box located on the crane.

[0020] The proximity switch is located at the bottom of the crane cab or hook. There are two proximity switches, which are photoelectric or inductive. The conductor is located outside the dangerous area 5 within the crane's travel range, and the conductor is positioned higher than the highest point of the equipment or personnel in the dangerous area. The dangerous area is the work area where the work position is close to the crane cab or hook. There are two conductors, and the line connecting them is in the same direction as the crane's travel direction. The conductor is positioned lower than the proximity switch, and the height difference between the conductor and the proximity switch is within the effective distance of the proximity switch. The audible and visual alarm and the crane power supply box 6 are connected to the proximity switches via a circuit. The open contacts of the two proximity switches are connected in parallel and then connected in series with two parallel intermediate relays KA1 and KA2. The normally closed contact of relay KA1 is connected in series with the coil of the crane contactor KM1 in the crane power supply box, and the normally open contact of relay KA2 is connected in series with the coil of the alarm contactor KM2. The proximity switches are also connected to the proximity switch power supply 7.

[0021] The method of using this device is as follows:

[0022] 1. Install two identical conductors of equal height on the outer perimeter of the hazardous area within the crane's travel range. The conductors should be positioned higher than the highest point of any equipment or personnel operating within the hazardous area. Specifically, the hazardous work area should be located at both ends of the crane's travel direction (e.g., in hazardous work areas very close to the crane's cab or hook). The line connecting the two conductors should align with the crane's travel direction. This placement ensures that when the crane travels in either direction to reach the hazardous area, one of the two proximity switches at the corresponding position on the lower end of the crane will be directly above one of the conductors, without posing any safety hazard to the hazardous work area.

[0023] 2. In the direction of the crane traveling through the hazardous work area, two identical proximity switches are installed at the same height at both ends below the crane, and the direction of the line connecting their positions is set to be consistent with the direction of the crane's travel that requires safety warning and work protection. When the crane travels to a suitable position, the proximity switch at the corresponding position at the bottom of the crane can reach directly above the conductor of the hazardous work area.

[0024] 3. When using conductors, place them on the conductor mounting rack. The height of the conductors installed at both ends outside the hazardous work area must ensure that they do not cause destructive collisions with the proximity switches below the crane, and that their height difference is within the effective distance of the proximity switches. When the crane moves close to the hazardous work area, a proximity switch at the bottom of the crane should be able to reach directly above one of its conductors.

[0025] 4. Connect the open contacts of two proximity switches 1 and 2 in parallel, then connect them in series with two intermediate relays KA1 and KA2, ensuring that the activation of any proximity switch will simultaneously trigger both intermediate relays. The normally closed contact of relay KA1 is connected in series with the coil of the gantry contactor KM1 in the power supply box. When the proximity switch is triggered, the gantry power supply is disconnected, and the crane stops. The normally open contact of relay KA2 is connected in series with the coil of the alarm contactor KM2. When the proximity switch is triggered, the alarm power supply is activated, and the crane alarm device is activated.

[0026] Depend on Figure 1 As can be seen from the direction of operation, when the crane moves to the left and the distance between proximity switch 1 and conductor 2 is less than the effective distance of the proximity switch, proximity switch 1 is activated and its open contact is closed, which energizes the intermediate relay KA1 connected to it. The normally closed main contact KA1 controlled by intermediate relay KA1 is opened, which de-energizes the crane contactor coil KM1 connected in series with it, causing the crane to stop moving due to power failure. At the same time, the normally open main contact of intermediate relay KA2 is energized and closed, which energizes the alarm contactor coil KM2 connected in series with it, and the crane's audible and visual alarm is energized and sounds an alarm. Similarly, when the crane moves to the right and the distance between proximity switch 2 and conductor 1 is less than the effective distance of the proximity switch, proximity switch 2 will also be activated and its open contact will close, energizing the intermediate relay KA1 connected to it. The normally closed main contact KA1 controlled by intermediate relay KA1 will open, causing the crane contactor coil KM1 connected in series with it to be de-energized, thus de-energizing the crane and stopping its movement. At the same time, the normally open main contact of intermediate relay KA2 will be energized and closed, energizing the alarm contactor coil KM2 connected in series with it, and energizing the crane's audible and visual alarm.

[0027] 5. When work in the hazardous area is completed or suspended, and the crane is permitted to pass, the worker in the hazardous area should remove the conductor. If the height difference between the conductor and the proximity switch is outside the effective distance of the proximity switch, the conductor will not function, and the proximity switch will not activate. The crane operator can then reset the power supply on the crane to resume normal crane movement. In similar hazardous work areas, workers can proactively choose whether to use safety warnings and protective devices based on their own work situation, taking proactive precautions and avoiding relying entirely on the crane operator for their safety.

Claims

1. A crane travel safety warning and protection device, characterized in that, Includes a proximity switch, a conductor mounted on a conductor mounting bracket and corresponding to the proximity switch, and an audible and visual alarm located on a crane. The proximity switch is located at the bottom of the crane cab or hook. The conductor is located outside the dangerous area within the crane's travel range, and its height is higher than the highest point of the equipment or personnel in the dangerous area. The audible and visual alarm and the crane's power supply box are connected to the proximity switch via a circuit.

2. The crane travel safety warning and protection device according to claim 1, characterized in that, There are two proximity switches.

3. The crane travel safety warning and protection device according to claim 1, characterized in that, The proximity switch is either photoelectric or inductive.

4. The crane travel safety warning and protection device according to claim 1, characterized in that, There are two conductors, and the line connecting their positions is in the same direction as the travel direction of the crane.

5. The crane travel safety warning and protection device according to claim 1, characterized in that, The conductor is installed at a height lower than the proximity switch, and the height difference between the conductor and the proximity switch is within the effective distance of the proximity switch.

6. The crane travel safety warning and protection device according to claim 1, characterized in that, After the open contacts of the two proximity switches are connected in parallel, they are connected in series with the two parallel intermediate relays KA1 and KA2. The normally closed contact of relay KA1 is connected in series with the coil of the crane contactor KM1 in the power supply box of the crane, and the normally open contact of relay KA2 is connected in series with the coil of the alarm contactor KM2.

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