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Equipment safety accident of injection molding machine blockchai
Publish: 2021-04-22 07:15:05
1. < file FSID = "1122637859565392" link = / share / link? Shareid = 3358141232 & UK = 1346724331 "name =" calculation of bending moment and shear force of beam with concentrated load and live load,. Zip "wealth =" 0 "/ >
2. If it is a simply supported beam with concentrated force in the middle of the span, the bending moment in the middle of the span is (FL) / 4
3. At the action point of concentrated force, the bending moment diagram has a cusp, which points in the same direction as the concentrated force. As for how to find out, it depends on the specific topic. For beams, it is usually to find out the support reaction force, and use the section method to find out the bending moment value of the left section or the right section of the section at the action point of the concentrated force.
4.
5. Equipment accident
refers to the action or event that the equipment (including all kinds of proction equipment, pipelines, workshops, buildings, structures, instruments, telecommunications, power, transportation and other equipment or facilities) of instrial enterprises stop proction or rece efficiency e to abnormal damage, and the direct economic loss exceeds the specified limit. The purpose of strengthening the management of equipment accidents is to take timely and effective measures to prevent the expansion and recurrence of equipment accidents. And draw lessons from the accident, to prevent the recurrence of the accident, to eliminate the accident, to ensure safety in proction
equipment failure,
generally refers to the event or phenomenon that the equipment loses or reces its specified function, which is manifested as the loss of original precision or performance of some parts of the equipment, which makes the equipment unable to operate normally and reces its technical performance, resulting in the interruption of proction or the rection of efficiency, thus affecting the proction
ring the use of the equipment, e to the effects of friction, external force, stress and chemical reaction, the parts will graally wear, corrode and fracture, resulting in shutdown e to failure. Strengthen the equipment maintenance, timely grasp the wear condition of parts, before the parts enter the stage of severe wear, repair and replacement, can prevent the economic losses caused by fault shutdown
the term "fault" is often confused with the words "abnormal" and "accident" in practical use. The so-called exception means that the device is in an abnormal state. What is the normal state? If you don't even have a standard for judging normality, you can't define exceptions. For a fault, it is necessary to make clear what the specified performance of the target equipment should be maintained and how far the specified performance is now. Otherwise, the specific content of the fault cannot be made clear. If the state of an object equipment is different from the specified performance range, the abnormality of the equipment should be considered as a fault. On the contrary, if the state of the object equipment is within the allowable level of the specified performance, even if there is an abnormal phenomenon, it can not be regarded as a fault. In short, the equipment management personnel must clearly work out the normal state and specified performance range of the equipment. Only in this way, can we make clear the relationship between abnormal and fault phenomena, so as to make clear what is abnormal and what is fault. If not, chaos cannot be avoided
accident is also a kind of fault, which is a term established by focusing on the consideration of safety and cost. It usually refers to the loss of safe state or abnormal damage of equipment
1. Accident: it has occurred, causing loss and damage,
for example, short-circuit arc causes circuit breaker tripping, burning and scrapping
2. Fault: if the operation is abnormal, simple inspection and treatment can restore in time,
if the leakage circuit breaker trips e to leakage or overload at the power end
3. Obstacle: not clear, it probably means that it is abnormal and can be normal only after modification.
if the circuit breaker parameters are not suitable, the parameter specification must be changed
4. Abnormal: it may be the precursor of the accident, but the loss has not been caused, and the cause is not clear.
for example, the cable overheats in normal operation and has the smell of burning plastic.
refers to the action or event that the equipment (including all kinds of proction equipment, pipelines, workshops, buildings, structures, instruments, telecommunications, power, transportation and other equipment or facilities) of instrial enterprises stop proction or rece efficiency e to abnormal damage, and the direct economic loss exceeds the specified limit. The purpose of strengthening the management of equipment accidents is to take timely and effective measures to prevent the expansion and recurrence of equipment accidents. And draw lessons from the accident, to prevent the recurrence of the accident, to eliminate the accident, to ensure safety in proction
equipment failure,
generally refers to the event or phenomenon that the equipment loses or reces its specified function, which is manifested as the loss of original precision or performance of some parts of the equipment, which makes the equipment unable to operate normally and reces its technical performance, resulting in the interruption of proction or the rection of efficiency, thus affecting the proction
ring the use of the equipment, e to the effects of friction, external force, stress and chemical reaction, the parts will graally wear, corrode and fracture, resulting in shutdown e to failure. Strengthen the equipment maintenance, timely grasp the wear condition of parts, before the parts enter the stage of severe wear, repair and replacement, can prevent the economic losses caused by fault shutdown
the term "fault" is often confused with the words "abnormal" and "accident" in practical use. The so-called exception means that the device is in an abnormal state. What is the normal state? If you don't even have a standard for judging normality, you can't define exceptions. For a fault, it is necessary to make clear what the specified performance of the target equipment should be maintained and how far the specified performance is now. Otherwise, the specific content of the fault cannot be made clear. If the state of an object equipment is different from the specified performance range, the abnormality of the equipment should be considered as a fault. On the contrary, if the state of the object equipment is within the allowable level of the specified performance, even if there is an abnormal phenomenon, it can not be regarded as a fault. In short, the equipment management personnel must clearly work out the normal state and specified performance range of the equipment. Only in this way, can we make clear the relationship between abnormal and fault phenomena, so as to make clear what is abnormal and what is fault. If not, chaos cannot be avoided
accident is also a kind of fault, which is a term established by focusing on the consideration of safety and cost. It usually refers to the loss of safe state or abnormal damage of equipment
1. Accident: it has occurred, causing loss and damage,
for example, short-circuit arc causes circuit breaker tripping, burning and scrapping
2. Fault: if the operation is abnormal, simple inspection and treatment can restore in time,
if the leakage circuit breaker trips e to leakage or overload at the power end
3. Obstacle: not clear, it probably means that it is abnormal and can be normal only after modification.
if the circuit breaker parameters are not suitable, the parameter specification must be changed
4. Abnormal: it may be the precursor of the accident, but the loss has not been caused, and the cause is not clear.
for example, the cable overheats in normal operation and has the smell of burning plastic.
6. If it is a simply supported beam with concentrated force in the middle of the span, the bending moment in the middle of the span is (FL) / 4
7. The main causes of injuries caused by mechanical equipment accidents are as follows:
1. For example, the pressure parts of forging hammer, punch press, plate cutting machine, the bed head of shaper, the bed surface of gantry press, bridge crane, trolley and lifting mechanism all move in a straight line. The injury accidents caused by the parts and components of the straight-line transport capacity mainly include crush injury, crush injury and crush injury
2. Injuries caused by rotating parts of mechanical equipment. For example, the gear, supporting pulley, pulley, chuck, shaft, smooth screw, lead screw, coupling and other parts and components in machinery and equipment all rotate. The main forms of injuries caused by rotation are strangulation and object strike
3. Damage caused by cutting tools. For example, turning tools on lathes, milling tools on milling machines, drill bits on drilling machines, grinding wheels on grinding machines, saw blades on sawing machines, etc. are all tools for processing parts. The main injuries caused by cutting tools in machining parts are scald, stab and cut
4. Injuries caused by processed parts. In the process of machining parts, mechanical equipment may cause personal injury. This kind of injury accidents mainly include: (1) if the processed parts are not fixed firmly, they will be thrown out and hurt people. For example, if the lathe chuck clamp is not fixed firmly, the workpiece will be thrown out and hurt people when rotating. ② The parts to be processed may be damaged ring lifting and loading and unloading
5. Injuries caused by hand tools
6. Injury caused by electrical system. Most of the mechanical equipment used in the factory is powered by electric energy, so each mechanical equipment has its own electrical system. It mainly includes motor, distribution box, switch, button, local lighting, neutral (ground) and feeder wire, etc. The main injury of electrical system to people is electric shock
7. Other injuries. In addition to the above injuries, mechanical equipment may also cause other injuries. For example, when some mechanical equipment is used, it is accompanied by strong light, high temperature, chemical energy, radiation energy, st and toxic substances, etc., which may cause harm to human body
the treatment of equipment accident should follow the following principles
(1) according to the external symbol of the equipment indicated by the instrument, confirm that the unit has failed
(2) firstly, remove the threat to personal and equipment safety, and disconnect or stop the faulty equipment immediately when necessary
(3) quickly check the nature, cause, location and damage scope of the fault, and eliminate the fault as soon as possible according to the regulations
(4) do everything possible to ensure the safe operation of non fault equipment and not to expand the accident< (5) try to ensure the normal supply of auxiliary power
(6) at every stage of eliminating the fault, report to the shift leader, shift chief operator and field branch as soon as possible, so as to take correct Countermeasures and prevent the spread of the accident.
1. For example, the pressure parts of forging hammer, punch press, plate cutting machine, the bed head of shaper, the bed surface of gantry press, bridge crane, trolley and lifting mechanism all move in a straight line. The injury accidents caused by the parts and components of the straight-line transport capacity mainly include crush injury, crush injury and crush injury
2. Injuries caused by rotating parts of mechanical equipment. For example, the gear, supporting pulley, pulley, chuck, shaft, smooth screw, lead screw, coupling and other parts and components in machinery and equipment all rotate. The main forms of injuries caused by rotation are strangulation and object strike
3. Damage caused by cutting tools. For example, turning tools on lathes, milling tools on milling machines, drill bits on drilling machines, grinding wheels on grinding machines, saw blades on sawing machines, etc. are all tools for processing parts. The main injuries caused by cutting tools in machining parts are scald, stab and cut
4. Injuries caused by processed parts. In the process of machining parts, mechanical equipment may cause personal injury. This kind of injury accidents mainly include: (1) if the processed parts are not fixed firmly, they will be thrown out and hurt people. For example, if the lathe chuck clamp is not fixed firmly, the workpiece will be thrown out and hurt people when rotating. ② The parts to be processed may be damaged ring lifting and loading and unloading
5. Injuries caused by hand tools
6. Injury caused by electrical system. Most of the mechanical equipment used in the factory is powered by electric energy, so each mechanical equipment has its own electrical system. It mainly includes motor, distribution box, switch, button, local lighting, neutral (ground) and feeder wire, etc. The main injury of electrical system to people is electric shock
7. Other injuries. In addition to the above injuries, mechanical equipment may also cause other injuries. For example, when some mechanical equipment is used, it is accompanied by strong light, high temperature, chemical energy, radiation energy, st and toxic substances, etc., which may cause harm to human body
the treatment of equipment accident should follow the following principles
(1) according to the external symbol of the equipment indicated by the instrument, confirm that the unit has failed
(2) firstly, remove the threat to personal and equipment safety, and disconnect or stop the faulty equipment immediately when necessary
(3) quickly check the nature, cause, location and damage scope of the fault, and eliminate the fault as soon as possible according to the regulations
(4) do everything possible to ensure the safe operation of non fault equipment and not to expand the accident< (5) try to ensure the normal supply of auxiliary power
(6) at every stage of eliminating the fault, report to the shift leader, shift chief operator and field branch as soon as possible, so as to take correct Countermeasures and prevent the spread of the accident.
8. 1. Maximum bending moment
1) reaction force of support: rleft + Rright = 9kn
Σ mright = 0, rleft * 3-3 * 2 + 6 * 1 = 0
rleft = 4kn, Rright = 5kn
2) maximum bending moment from left end to 3kn load: M = R * x = 4 * 1 = 4kn * m
maximum bending moment from 3kn load to 6kn load: M = rleft * x-3 * (x-1)
because 1 ≤ x ≤ 2, there is a maximum when x = 2, M = 5kn * m
when the load is 6kn ~ the maximum bending moment at the right end is: M = r right * x = 5kn * m
that is, at 6kn of concentrated load, there is a maximum value of 5km * m
2 and a maximum shear force of 5km (shear force is the differential of bending moment, which can be simply understood as F = m / M = 5kn * m / 1m = 5)
1) reaction force of support: rleft + Rright = 9kn
Σ mright = 0, rleft * 3-3 * 2 + 6 * 1 = 0
rleft = 4kn, Rright = 5kn
2) maximum bending moment from left end to 3kn load: M = R * x = 4 * 1 = 4kn * m
maximum bending moment from 3kn load to 6kn load: M = rleft * x-3 * (x-1)
because 1 ≤ x ≤ 2, there is a maximum when x = 2, M = 5kn * m
when the load is 6kn ~ the maximum bending moment at the right end is: M = r right * x = 5kn * m
that is, at 6kn of concentrated load, there is a maximum value of 5km * m
2 and a maximum shear force of 5km (shear force is the differential of bending moment, which can be simply understood as F = m / M = 5kn * m / 1m = 5)
9.
Directly refer to concise building structure design manual; Mmax=2Pa² b² ÷ L³
10.
It is not necessary to calculate the support reaction when drawing the bending moment diagram, but the shear force diagram can be drawn according to the bending moment
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