Hidden dangers and analysis of the hottest machine

2022-09-28
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Safety hazards and analysis of machine tool products

machine tools are mechanical equipment integrating machinery, electricity, hydraulics and pneumatics. They have many risk factors and cause great damage. Through product inspection over the years, we found the following hidden dangers and problems in machine tool products:

hidden danger 1: workpieces and knives fly out of danger, hidden killing machine tools are high-speed machines

if the spindle rotation speed of the machine tool is low, it will rotate hundreds of revolutions per minute, and if it is high, it will rotate tens of thousands to hundreds of thousands of revolutions per minute. The workpiece and/or cutter rotating at high speed may fly out, which may cause personal injury or even death. Specifically, first, the clamping device of the workpiece or tool is not firmly clamped, causing the workpiece or tool to fly out; Second, there is no protective device or the protective device does not meet the requirements, and the flying workpiece or cutter cannot be protected; Third, there is a lack of necessary warning content for users in products or technical documents

hidden danger 2: the product has the risk of electric shock

electric shock can be divided into direct electric shock and indirect electric shock: the electrified body in which the human body directly contacts the dangerous voltage is a direct electric shock; The electrified body that is not electrified when touched by human body and is electrified due to insulation failure of electrical parts is indirect electric shock. The direct electric shock danger of the product is usually that the live terminal of the power supply is not protected, that is, the live terminal is exposed, and the user is very likely to have an electric shock accident in use or maintenance; The indirect electric shock hazard of the product is usually the incomplete electrical grounding system of the machine tool and the lack of protective grounding wire. The protective grounding wire is called 'lifeline', which is very important to the operator. Once the insulation of electrical components fails and leakage occurs, it can effectively protect the safety of personnel, and its importance is self-evident

hidden danger 3: there are safety hidden dangers in the emergency stop operating parts and power switches. The emergency stop operating parts are extremely important for machine tool products. They are electrical devices specially set up to reduce casualties or equipment damage in the event of an accident of the machine tool

the standard requires that Lou Huafen, vice president of the aluminum material utilization research institute, and Yu Minggao, a specialist in the emergency stop, are dedicated, free of additional hazards, easy to operate, self-locking mechanism, and the color is special red. The product has no emergency stop device or the emergency stop device does not meet the standard requirements. In case of emergency or accident, it cannot prevent personnel from being injured or equipment from being damaged. At present, some enterprises' products do not install emergency stop devices or the emergency stop devices do not meet the standard requirements. The power switch is an important device connecting the machine tool and the external power supply. The power switch on the machine tool is different from the general power switch. In addition to the capacity (including rated voltage, current, short-circuit current, etc.) to meet the use requirements, it is also required to play a good role in protecting the safety of machine tool equipment and personnel. The standard stipulates that "the power switch should provide a locking mechanism in the disconnected position" is this purpose. In order to reduce costs, some enterprises often use the power switch without locking mechanism in the off position, leaving hidden dangers for machine tools

hidden danger 4: static danger cannot be ignored

static hazard mainly refers to the harm of the structure and shape of the exposed parts of the product to people. For example, sharp edges, corners and burrs of exposed parts may cause scratches to people. The product (3) is sometimes inlaid with special steel at the jaw; Sharp edges, corners and burrs on the surface not only give people the impression of "rough products", but also may cause different degrees of scratches or stabbing to personnel (such as operators). For example, the periphery of the workbench is as sharp as a knife edge. Once the operator doesn't pay attention to it, he will be scratched. Another example is the chip baffle near the operator, with sharp corners everywhere, which may be scratched at any time

hidden danger 5: the product instruction manual is not standardized

the product instruction manual is an important part of the product and a guiding document to guide users to operate the machine tool correctly and safely. However, there are many problems in the product manual of machine tools, mainly manifested in: first, the lack of safety precautions or the incomplete content of safety precautions, which can not guide users to use safely, and bring hidden dangers to users. For example, the mobile workbench with rapid positioning has the risk of collision with personnel, which is an unavoidable medium risk in the structural design. In addition to adding permanent warning signs near the dangerous parts, there must be similar text warnings in the product manual; Second, the content in the product instruction manual is inconsistent with the product, causing inconvenience to users for correct use and maintenance. If the circuit diagram of the product is inconsistent with the physical object, once the machine tool breaks down and needs maintenance, the user will have no way to deal with it, so he has to resort to the manufacturer, which undoubtedly brings inconvenience to the user; Third, there is no enterprise contact information or legal unit of measurement, which is not responsible for users

hidden danger 6: incomplete product warning signs

the warning sign is also an important part of the product, and its purpose is to enable users to operate the machine tool correctly and safely. Attaching the warning sign to the product can more intuitively remind users from time to time. At present, some enterprises' products have the problem of incomplete warning signs, especially the lack of safety tips for users, which leads to whether the interfaces are loose and whether the products have potential safety hazards

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