How to avoid the occurrence of security accidents

On June 7, 2022, under the condition that the automatic ingot coding unit was not stopped, the main operator of the mechanical arm, surnamed Jin, entered the working area of the machine through the isolation fence safety door and cleaned the site within the working radius of the mechanical arm. As a result, the tragedy occurred......

Reviewing the above safety accidents, the reasons are not only caused by improper operation of the machine by the staff, but also caused by the failure of the mechanical equipment or the imperfect protective measures.

As the protagonist of the above accident, Jin, in the case of the machine is not stopped and the safety door of the isolation fence is not closed, it is cleaned within the scope of the operation of the mechanical arm, resulting in irreparable consequences.

At the same time, we can't help thinking that if we strengthen safety protection measures before the accident, can we avoid the accident?

Conduct pre-job training for staff

The staff of mechanical operations must be professionally trained to master the basic knowledge of the performance of the equipment, and can only be on duty after passing the examination to ensure the basic literacy of the mechanical staff; And for mechanical operators who must enter the work site because of things, safety measures must be ensured before they can enter.

Add LOTO tag and lock

For the staff, relying only on the security management mechanism to protect the safety of personnel is often unreliable. For the safety of staff, verbal measures warning and management mechanism are the main, and the support of safety protection devices is necessary!

LOTO is a safety procedure for maintaining equipment and machinery, mainly used in industrial manufacturing, energy production, building construction and other fields.

For example, when a variety of large machinery and equipment and production lines need to work or repair, the LOTO lock can ensure that no one will start the machine by mistake during these works, which plays a warning role, so as to ensure the safety of the staff. While LOTO listing locks adds some steps and procedures, it reduces errors and accidents.

Add safety carpet

As a pressure sensitive safety protection device, when a set minimum weight is applied to the safety carpet, the switch will be turned off, and the controller will send a stop signal to the protected machine to stop the movement. Reliable protection of the operator from all kinds of potential hazards.

The safety carpet is placed in the working area of the robot, so that when the worker enters the area, the working robot will stop and the worker can be protected.

Use of safety interlock switches

Safety interlock switch is a key device that can ensure safety, which can cut off the power in time when the machine or equipment is in danger, and is generally used in industrial production machines and equipment to play a fixed and protective role.

When the staff enters the working area of the machine, as long as the safety door is opened, the machine will be powered off and stop working, so that it can play a protective role.

Safety interlock switch, as an important protection device for mechanical safety, is widely used in automation production line, robot production line, dangerous test area and other industries.

For example, Oxon-T3, an interlock structure in line with ISO14119 and GB/18831 standards, can be used to monitor safety doors and safety Windows, forming a safety control system with high reliability, 4-way forced mechanical contacts and 2NC (normally closed) auxiliary output contacts, a unique lock core structure, locking force > 2000N, With the OXSL-02 deadbolt handle attachment, it can prevent unrelated personnel from operating the equipment and causing safety accidents.

For the staff engaged in mechanical operations, repetitive work all day long, often because of habit and fluke psychology and lead to frequent accidents, then, in order to be able to fully protect the safety of staff, external safety protection devices are crucial.

Whether it is a safety interlock switch, a safety carpet or a LOTO listing, it can play a role. Of course, the operation of these protective devices requires relays to control them. The general circuit is often divided into two parts, the main circuit and the control circuit, the relay is mainly used for the control circuit, together with other electrical components, to form the control line to achieve automatic operation.

The safety relay has been evaluated and certified by TUV, CE, 3C, ISO and other standards, and its safety performance has reached SIL3, PLe, Cat. 3, in line with electrical safety, mechanical safety, functional safety and other aspects of the design standards and application standards.

Quanta DN1100 series as a functional safety relay, in accordance with ISO13849 and GB/16855 related design standards, this series of models, high grade, 2 4A capacity safety output contacts and 3 sets of signal output, can be used for PLC or external indicating output. Supports dual-channel, single-channel-dual-channel, and single-channel-single-channel modes. It is suitable for emergency stop, door lock, touch side and other security components, and can also form an independent security monitoring system outside the functional system of the equipment.

In addition to the functional safety relay 1100 series, like the multi-functional safety relay Tner series, configurable safety relay DN1820 series have their own characteristics!