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1. Detonation, commonly known as knocking cylinder and calling rod. Detonation is an abnormal combustion phenomenon that occurs during the combustion of an engine. To put it simply, "knocking" is a phenomenon of abnormal combustion of the engine.
Detonation is an abnormal pressure in the combustion chamber caused by abnormal combustion. When the engine knocks, it makes a knocking sound. The slight discontinuous knocking sound is quite crisp, somewhat similar to the sound of tapping a triangle.
In the event of severe and continuous detonation, the engine will have a "mile-mile" sound, and the engine will also be obviously weak at this time.
1. There is an irregular metal knocking sound of "clang", "click" and "dangdang" in the engine.
2. Engine tremor.
3. The engine temperature is too high.
4. The fuel combustion is incomplete, and there is black smoke in the exhaust gas.
5. The engine power decreases.
6. Increased fuel consumption.
7. During normal driving, the speed suddenly changes inexplicably.
Second, the main reasons.
1. The ignition angle is too advanced: in order to make the piston get power immediately after entering the power stroke after the end of compression top dead center, it is usually ignited in advance before the piston reaches the top dead center (because it takes a while from ignition to complete combustion). Ignition too early will cause most of the oil and gas to burn when the piston is still compressing the stroke, and the unburned oil and gas will be subjected to great pressure and spontaneous combustion, resulting in detonation.
2. Excessive carbon deposition in the engine
Excessive carbon deposition in the combustion chamber of the engine will not only increase the compression ratio (high pressure), but also produce high temperature hot spots on the surface of the carbon deposit, causing the engine to knock.
3. The engine temperature is too high.
If the engine is too hot, the inlet temperature is too high, or the engine cooling water is poorly circulated, which will cause the engine to detonate due to high temperature.
4. The air-fuel ratio is incorrect
Too thin the fuel-air mixing ratio will increase the combustion temperature, and the increase in combustion temperature will cause the engine temperature to rise, of course, it is easy to knock.
5. The octane number of fuel is too low
The octane number is an indicator of the knock resistance of the fuel, and the higher the octane number, the stronger the knock resistance. Engines with high compression ratios have higher pressure in the combustion chamber, and are prone to knocking if fuel with low knock resistance is used.
3. Inspection and maintenance.
1. Detect the change of engine combustion chamber pressure; Detect the vibration frequency of the engine block; Detection of combustion noise of gas mixtures.
2. The measurement accuracy of directly detecting the pressure change of the combustion chamber to detect the vibration of the engine is high, but the sensor is difficult to install, and the durability is poor, so it is generally used for measuring instruments, and the pressure detection sensors in practical applications are indirect detection type.
3. The fastest and most effective way to suppress detonation is to delay the ignition advance angle and reduce the combustion pressure. Therefore, the working principle of the knock sensor is that when the engine knocking is detected, the ignition advance angle will be delayed to the ignition time when the detonation will not be detonated, and then the ignition will be slowly restored in advance when the engine does not detonation.
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This one has an external sensor, and the cylinder piston has a magnetic ring, and when it reaches the position of the sensor, the external sensor will send a signal.
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Chen Hsong injection molding machine: Please check the removal of the robot.
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The end of the mold opening did not give a signal! Or something else.
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The signal of opening the mold in place is cylinder or private service.
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Mechanical hand, most of which refers to the automatic grasping and operating device attached to the host (industrial robot) and fixed program (generally called manipulator or special manipulator in China). Such as automatic line, automatic machine loading and unloading, automatic tool change of machining center automation device. It generally consists of an actuation system, a drive system, a control system, and an artificial intelligence system.
The drive system is composed of various electrical, hydraulic and pneumatic devices. The pneumatic device is composed of compressor, pipeline system, control valve system, air pressure energy into mechanical operation and other components. The cylinder is the main component that converts air pressure into mechanical operation.
Therefore, the manipulator needs to use a cylinder.
See diagram below
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All I know is that changing the air pressure in the cylinder can generate a lot of kinetic energy, and the manipulator of the cylinder is stable and powerful.
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The cylinder has better control, PLC and other controls can be used, and the cylinder transmission medium is gas, which can be controlled by the range, and is not easy to produce sparks, which can be widely used in large-scale production lines and petrochemical industries.
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Clip ??? In the actual operation process, the suction cup is generally used to move the product and will not be crushed. Obviously, if a spring is used, a spring with very good comprehensive mechanical properties must be used to ensure its service life.
In this way, the cost is relatively high, and if the spring is used, it is not conducive to automatic control in the production process, and it is troublesome to replace. In general, a spring is used to return to the end sight.
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The benefits of pneumatic cylinders are:
1. The installation design is convenient, and it needs to be installed there, regardless of the fit, tolerance, etc. It is possible to compact the machine.
2. Compared with machinery, the cylinder can easily realize linear line, swing, blessing, adsorption and other actions.
3. The speed and strength of the cylinder are easy to adjust.
4. Compared with hydraulics. The cylinder is clean, fast and small.
With the spring structure, the driving force is still required, and after all, it is chosen between mechanical, electrical, pneumatic and hydraulic.
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Cylinder push controls the magnitude and direction of the force.
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If it is to carry objects, it is necessary to realize the clamping action, and to achieve the opening and closing and control the magnitude of the force, speed and the simplicity of the mechanism, pneumatics is the easiest to satisfy.
If it is only for clamping objects, then it is only necessary to deal with the clamping force.
In fact, a designer must consider the requirements when designing it: function, performance, manufacturability, safety, economy and pleasantness.
If you can meet these requirements with a spring, then so can a spring.
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It should be similar to what you said, it is to install a spring on the anti-falling cylinder rod, and when there is no air source, the force of the spring makes the anti-falling cylinder rod against the arm, and when the air source pressure is normal, the cylinder rod is retracted.
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In general, it is the median function of the three-way solenoid valve of the cylinder that works. The median function is voltage stabilization, and the springs on both sides bounce to the neutral position while sealing the air inlet and outlet ports.
The cylinder is generally controlled by sensors.
Cylinders that do not supply air will always extend or retract according to their gravity.
I don't understand the specific structure of the injection manipulator.
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Gripper plus sensor, induction identification whether you have got the product, if it is a suction cup, you can also increase vacuum detection.
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We can connect the manipulator 132---153---643---57
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Go to the Internet to search for the schematic diagram of the steam turbine, and take a look at it to understand, it is very simple, through the steam push valve, and then drive the shaft, and the shaft rotates to drive the mechanical transmission device outside.
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The cylinder is powered by a valve valve that pushes the shaft to reciprocate.
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You should be asking about the structure and principle of the pneumatic clamp, right?
The efficiency of the injection molding manipulator is much higher than that of manual work, and it is also more cost-saving, and it only needs power supply to work continuously without rest. The manipulator can pick up the piece for 3 seconds, and it is not afraid of being hot. According to reports, Bronte's injection manipulator has used a lot of patents, and the efficiency is much higher than that of other manufacturers' injection manipulators.
There is no doubt about this, it is absolutely valid.
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You can buy a small 80-ton one, or a second-hand one, and it's about 70,000 yuan.
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