Daily maintenance method of horizontal tensile testing machine
Horizontal tensile testing machine is mainly used for static tensile performance test of materials and parts. It can also be used for the stretching of various metal materials, steel cables, chains, lifting belts, etc. It is widely used in metal products, building structures, ships, military industries and other fields. The testing machine uses mature universal testing machine technology, adds a steel frame structure, changes the vertical test into a horizontal test, and satisfies the test of large specimens and full-scale specimens. This is done by a vertical tensile testing machine. Less than. In our daily use, we must maintain the equipment from the following points:
1. Ensure that the testing machine is clean. The parts of the testing machine should be wiped frequently to ensure that they are clean. After wiping the unpainted surface, wipe it with a small amount of oil with cotton yarn to avoid rust, especially during the rainy season. Zhengzhou Cancer Hospital, when not in use, use a dust cover to prevent dust from intruding. All valves on the hydraulic control box should not be opened to prevent dust from entering the interior and affecting the flexibility of the hydraulic control mechanism. Frequent use for a long period of time can cause the oil volume to decrease or change. We should check the oil volume every 1-3 months based on the operating conditions.
2. Replace the hydraulic oil in time. After the equipment stops running for 15 minutes, check the oil level of the hydraulic control box. If the oil is insufficient, add the same type of hydraulic oil; if the oil has changed, release the oil and replace it with new hydraulic oil. Frequent use of equipment for tensile rupture tests may cause local fasteners to loosen, and the fastening conditions of these parts should be checked frequently.
3. Check equipment regularly. There are two (8 in total) L-shaped pressure plates at the front and back of the fixed beam and the moving beam (to serve as a guide for the jaw clamping plate), and each of the eight pressure plates is fixed with 2 screws; each end of the movable beam has 6 screws; each 6 Check the tightness level of the screw drive chain once a month, adjust the position of the tension wheel accordingly (the lower part of the main body needs to be removed and stop), according to environmental conditions and frequency of use, stop smoothing the following parts every 3-6 months.
Before the horizontal tensile testing machine is verified, it must be strictly in accordance with the device requirements of the equipment to stop the reliable device. The alignment of the standard dynamometer should be accurate and reliable, to prevent tilt and eccentricity, and should be balanced and stable in the horizontal and vertical directions. If we want to extend the service life of the equipment, in our daily use, we must not only follow the operation steps of the equipment manual, but also pay more attention to the daily maintenance of the equipment. Only by taking both into account can the equipment work better.
There are two options for the conventional xenon lamp aging test box on the market, one is the flat air-cooled xenon lamp aging test box, and the other is the rotating water-cooled xenon lamp aging test box.
Why do air-cooled xenon lamp aging test chambers have more flat-panel structures? However, there are also individual customers who say that their counterparts make vertical rotating air-cooled xenon lamps for them. From a professional perspective, it is not recommended to design this way, because the vertical rotating type can only use one lamp tube and one lamp tube. Generally, higher power is required, usually 6KW, but air cooling uses wind to cool the lamp tube. Generally, air cooling cannot cool the lamp with such a high power.
Commonly used air-cooled lamps are 1.5KW, 1.8KW, and the enhanced version is 2.5KW. If you use too low power and only one tube, the effect may not be achieved. If you use high-power air-cooled cooling The effect is not good and the lamp tube is easily damaged. Therefore, it is not recommended to make an air-cooled vertical rotating xenon lamp test box. This is the reason why the air-cooled xenon lamp aging test chamber has a flat structure.
At present, some domestic equipment in 50 ~ 500 mm / min, some in 0.001 ~ 500 mm / min, the former generally use ordinary trapezoidal screw plus speed motor or frequency conversion speed control system, the cost is lower, wear and tear. Over time, the test more will produce a shaking of the center link plate, affecting the test accuracy, and time soon, the machine is noisy and easy to break; a laboratory put such a tractor-like tension machine, certainly not in a good mood, the follow-up maintenance is also a lot of overhead. So we must also think about our testers. The latter uses a servo system with ball screw, high precision, constant speed and stable speed, small wear and tear, better durability. The measured test repeatability is also good. The standards have specified test conditions, what material how much speed, because the speed is not the same measured force value is not the same. Such as all kinds of production equipment robots are used in the servo system, if you have the opportunity to go to the car factory to see, car parts in each position is no difference. Think about how relieved you can be to put such a machine into your own factory, out of the product after the test, the heart will be confident, the price will be sold accordingly, the customer is also easy to accept.
As flexible packaging materials are mainly polymer or its related materials, as mentioned before polymer materials elongation is far better than metal, fiber, wood, plate and other materials, so the detection of polymer tensile strength machine with the usual material tensile properties testing tensile strength machine has some differences, especially need to pay attention to the effective stroke of the electronic tensile strength machine and the specimen fixture two aspects. Tensile properties of plastics and rubber is one of the most important and basic mechanical properties, which largely determines the use of the plastic and rubber occasions. Tensile properties of good or bad, can be tested by tensile test machine tensile test. Tensile properties of polymers tensile test: when used as a material requires polymers to have the necessary mechanical properties. It can be said that for most applications of polymers, mechanical properties are more important than other physical properties. Polymers have the widest range of mechanical properties of any known material due to the fact that polymers are composed of long chain molecules and have significant relaxation properties in molecular motion.
For example, polymer materials have a fairly high elongation, the general PE elongation at break in 90% to 950% (including linear low density polyethylene LLDPE elongation is higher), through a special production process, the elongation of some materials can be above 1000%, while the elongation at break of ordinary polymer materials are also mostly between 50% to 100%. Usually the higher requirements for the tensile properties of the material are heat shrinkable film as well as stretch film. Tensile test machine tensile test: tensile test (stress-strain test) is generally the material specimen ends are clamped in two jigs at a certain distance apart, the two jigs to a certain rate of separation and stretching the specimen to determine the stress change on the specimen until the specimen damage. Tension machine tensile test is one of the most widely used methods to study the mechanical strength of materials, which requires the use of constant speed motion. According to the different ways of load determination, can be broadly divided into two types of pendulum type tensile testing machine and electronic tensile testing machine, currently more commonly used is the electronic tensile testing machine.
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As a small to mid-sized business, you are likely approached by numerous phone providers about a variety of phone technologies. How do you cut through the clutter to select the service provider that is right for you?
A traditional phone system is also referred to as a legacy system. It runs on a physical box (“brain”) located at the company’s office, and is connected by wires to each individual phone. These premise-based devices are dependent on the number of users and the number of outside lines required to make outbound calls.
They also require multiple cards depending on the number of users and telephone lines used. Companies with multiple locations also need multiple “brain boxes”. If the company grows after the initial purchase, a Technician has to manually upgrade the hardware to add new users.
PBX is short for "private branch exchange." Businesses typically use this type of private telephone network. Once installed, employees share a certain number of lines to make outside calls. To install a PBX system, you must have the PBX console, along with a telephone cord and plug. Once you install the system, you should test it to ensure it works.
As a small to mid-sized business, you are likely approached by numerous phone providers about a variety of phone technologies. How do you cut through the clutter to select the service provider that is right for you?
A traditional phone system is also referred to as a legacy system. It runs on a physical box (“brain”) located at the company’s office, and is connected by wires to each individual phone. These premise-based devices are dependent on the number of users and the number of outside lines required to make outbound calls.
They also require multiple cards depending on the number of users and telephone lines used. Companies with multiple locations also need multiple “brain boxes”. If the company grows after the initial purchase, a Technician has to manually upgrade the hardware to add new users.
PBX is short for "private branch exchange." Businesses typically use this type of private telephone network. Once installed, employees share a certain number of lines to make outside calls. To install a PBX system, you must have the PBX console, along with a telephone cord and plug. Once you install the system, you should test it to ensure it works.
How to select the connection options of voice gateway
A voice gateway is one of the most important components within a voice over IP infrastructure. The voice gateway is used to connect the enterprise VoIP network with the telecommunications provider, using a number of different connectivity methods, such as PSTN, ISDN and SIP.
In many cases, voice gateways are also used as "interfacing devices" between old analog devices and the VoIP infrastructure. Some examples include fax machines, security alarm systems and analog phones. These devices normally require a PSTN line to work. In these cases, the voice gateway can simulate a PSTN line connecting the analog device to the VoIP network via an FXS port .
Voice gateways support a variety of protocols, allowing easy integration with any type of VoIP infrastructure. SIP voice gateways are very popular and usually compatible with all VoIP telephony vendors since SIP is the preferred protocol for VoIP communications.
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Making an all-around improvement to hotel communications infrastructure
Empower effective hotel businesses
Intense competition in the hotel industry drives hoteliers to pursue the high efficiency of communications and information management systems. Advanced and specialized communication solution not only facilitates hotel operations but also ensures high-quality guest experience and nourishes guest loyalty. Integrating IP communications is an indispensable aspect. With the IP communications system, guests can enjoy voice and video communications at a low expense while hotel staff collaboration is also enhanced.
The full scope of the hospitality solution includes powerful VoIP PBX or IP PBX as the server, TA FXS Gateway as the bridge between VoIP and hotel analog phones, open API for PMS integration, and a wide range of compatible hotel phones for the front desk, rooms, and back office.
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Treatment of pumping phenomenon of screw vacuum pump
Screw vacuum pump can remove a large amount of water vapor and a small amount of dust, but the screw vacuum pump may be extracted after long-term use. This kind of pumping phenomenon affects the normal operation of the equipment. This will make the screw vacuum pump unable to perform the corresponding work in the normal working mode.
1. For the higher screw vacuum pump, it is impossible to directly discharge the atmosphere. If the direct exhaust environment will constitute a screw vacuum pump, there will be too much pressure difference between the suction and discharge ports, which will overload the vacuum pump. Therefore, a higher vacuum must be ensured. Make sure there is open space between the rotors.
2. The front stage pump must be used when using the front stage pump, and then when the pressure in the system is sucked into a certain range, the front stage pump is used to inject the screw vacuum pump, so as to avoid the overload phenomenon of the screw vacuum pump.
In addition, when the rotor turns over continuously, the gas inhaled is drawn into the space between the rotor and the pump shell from the air inlet, and then discharged through the exhaust port. Since the suction space is completely closed, the internal gas in the pump chamber is not tightened and expanded. However, when the top of the rotor turns over the edge of the exhaust port and the space is connected with the exhaust side, a part of the gas returns to the space due to the high pressure on the gas exhaust side, so the gas pressure is high. It suddenly increased. As the rotor continues to move, the gas leaves the pump.
The pumping phenomenon of screw vacuum pump is also related to the usual maintenance work. Regular maintenance and timely detection of maintenance problems can not only reduce equipment failure, but also use the equipment very well.
Only remove the cable before using the vacuum pump unit. When installing, you need to re connect the cable yourself. However, attention must be paid to the correct method when connecting cables. Otherwise, it will have a great impact on the use of vacuum pump device. Everyone serves to explain the connection method of vacuum pump device for everyone:
When the vacuum pump unit wiring, must use polyester insulation tape. When packing, be sure to press half of the first circle and wrap in 8-12 layers. After wrapping, wrap two layers of plastic tape to increase strength. When the vacuum pump unit is connected, the copper core of the cable is stripped about 30-35mm long. Wipe the copper wire with abrasive cloth and strip the copper wire. The copper wire of the external three core cable is also stripped by 30-35mm and cleaned with abrasive cloth.
Insert the wiring of the vacuum pump unit into the copper wire part of the three core cable, strip off the external cable, and then bind it with fine copper wire, cut off the remaining part, and flatten it with scissors to prevent binding hands; at the same time, the three ends of vacuum pump shall be welded separately, and the surface of welding joint shall be smooth without burr and false welding. To ensure that there is no welding or unevenness, re weld the vacuum pump until the requirements are met.
For the wiring of vacuum pump unit, the three wires must be wrapped together with plastic tape to wrap two layers. The first layer is more than 50 mm above the end of each wire insulation layer and the second layer is 50 mm beyond the end of the first layer. Take a basin of cold water and immerse the wrapped thread in water safely. After 12 hours, the insulation shall not be less than 50 megohm with 500V megger. Otherwise, it should be repackaged until the requirements are met.
The grounding wire of the vacuum pump unit must also be wrapped according to the wiring process of the submersible cable; after connecting the vacuum pump unit, the insulation resistance should be continuously measured during drilling to observe the change and prevent the cable wall from damaging the cable insulation layer. When the drop is less than 0.5 megohm, the device must be started to detect the cause.
The circulating water vacuum pump is used for vacuumizing equipment such as vacuum drying oven, rotary evaporator, double glass reactor, etc., so as to reduce the air pressure in the experimental equipment, so that the tested samples can quickly evaporate at a lower temperature. For example, when used in a vacuum drying oven, the materials can be quickly dried at a lower temperature under the condition of high vacuum, without damaging the effective components of the sample, and No secondary pollution.
The circulating water vacuum pump is also known as the circulating water multi-purpose vacuum pump. As the name implies, in addition to vacuumizing, it should also be used for recycling. However, many units do not use the purpose other than vacuumizing when using the circulating water vacuum pump. For example, in the rotary evaporation experiment, we often use the method of connecting the suction nozzle of the vacuum pump directly to the vacuum air nozzle of the condenser for air extraction, If you feel that the pumping speed is slow, the two taps will be connected in parallel and connected to the rotary steam, which will increase the pumping speed. However, the water in the vacuum pump water tank will become hot because of the large amount of steam pumped. When the temperature rises to more than 40 ℃, the pumping efficiency will be reduced. If we look at the back of the water tank, we may notice that there are two nozzles on the top of the water tank. These two nozzles are for the purpose of To solve the problem that the water temperature in the water tank is too high, connect the water inlet of the water tank with a water pipe and put it into the pool, connect the water nozzle with the water pipe, turn on the faucet, and adjust to the appropriate flow rate, which can not only prevent the water temperature from being too high, but also reduce the radiation of corrosive gas on the circulating water vacuum pump.
2、 Multi purpose usage:
In addition to vacuum pumping and water circulation, circulating water vacuum pump has another purpose, which is to provide cooling water for condenser.
The specific operation method is as follows: connect the water inlet of the condenser of the rotary evaporator or double glass reactor to the water outlet on the back of the vacuum pump with a rubber tube, and then connect the water outlet of the condenser to the water inlet with a rubber tube. After checking that the hose is firmly connected, turn on the power switch of the circulating water vacuum pump, and then turn the knob switch on the back of the vacuum pump to a suitable position to adjust the flow, In this way, one machine can be used for many purposes.
Do you all know how to drain oil from liquid ring vacuum pump? Let's learn more today!
1. If you want to drain all the oil in the case of liquid ring vacuum pump, you can screw off the oil drain plug at the bottom of the box to drain the oil.
2. When the liquid ring vacuum pump is discharging oil, the height between the liquid level and the top plate of the oil tank shall not be more than 30mm, so as to ensure the lubrication and cooling of the bearings in the pump. When the volume of the jack working chamber is too large, another oil tank shall be set up to ensure that the minimum height of the liquid level after the external oil discharge is not less than 100 mm, so as to avoid being sucked out.
3. After the first 500 h operation of speed regulating hydraulic Siemens liquid ring vacuum pump, the oil tank and oil filter should be cleaned. The oil quality shall be tested by visual inspection and laboratory test. When the oil quality deteriorates, the oil shall be replaced in time. Oil tank and oil filter must be cleaned at the same time when changing oil. If there are metal chips or water in the oil, find out the cause and remove the fault.
4. In a short period of time when the liquid level drops, the bearing is lubricated by attached oil and splashing oil from plunger spring. The oil filter of oil tank and oil filter under pump are made of 230 mesh / inch copper mesh. The oil filter net should be cleaned frequently to prevent blockage. When in use, the oil temperature of oil tank should not exceed 60 ℃, and appropriate measures should be taken to cool it if necessary.
The working principle of centrifugal pump is: relying on the high-speed rotating impeller, the liquid obtains energy under the action of inertial centrifugal force to improve the pressure. Before the pump works, the pump body and water inlet pipe must be full of water to prevent cavitation. When the impeller rotates rapidly, the blade impels the water to rotate quickly. The rotating water flies away from the impeller under the action of centrifugal force. After the water in the pump is thrown out, the central part of the impeller forms a vacuum area. Under the action of atmospheric pressure (or water pressure), the water from the water source is pressed into the water inlet pipe through the pipe network. In this way, continuous pumping can be realized.
It is worth mentioning here: before starting the centrifugal pump, the pump shell must be filled with water before starting, otherwise the pump body will be heated, vibrated, the water output will be reduced, and the pump will be damaged (referred to as "cavitation") and cause equipment accident! The so-called cavitation refers to: when the centrifugal pump starts, if there is air in the pump, because the density of the air is very low, the centrifugal force generated after rotation is very small, so the low pressure formed in the center of the impeller is not enough to suck the liquid level lower than the inlet of the pump into the pump and can not transport the fluid。
Cleaning method of dust in vacuum negative pressure station
Vacuum negative pressure station is mainly used in chemical, petrochemical, light industry, pharmaceutical, papermaking, metallurgy and other occupations. Because of the particularity of the working environment, vacuum negative pressure station is easy to scale, which makes many companies helpless.
In addition to preventing scaling of vacuum negative pressure station, cleaning is required for vacuum negative pressure station with severe circumstances. Detailed operation methods are as follows:
1. In case of severe scaling, it is necessary to dismantle and remove the scale. The key point is to remove the scale on the impeller and distribution plate (or distributor). Pay attention to adjust the axial clearance when assembling from the beginning.
2. If you don't want to dismantle the vacuum negative pressure station, you can use oxalic acid solution or hydrochloric acid to soak in the pump, and then wash the pump body with clean water after soaking. Pay attention to the concentration and soaking time when using hydrochloric acid to avoid damaging the pump body.
Gas accident is the most important thing in coal mining industry in recent years. Dozens of innocent people can be killed in a mine accident. Therefore, the safety of equipment in coal mining industry can not be ignored. There are several basic forms of gas drainage by water ring vacuum pump / compressor
According to the relationship between coal mining and drainage: pre pumping before mining, that is, the drainage of coalbed methane from the undeveloped coal seam. Because the mining area is wide and the pipeline is long, it usually has dozens of kilometers. The working environment is bad, so the water ring vacuum pump / compressor is required to have large air volume, high vacuum degree and reliable operation. Now the water ring vacuum pump / compressor is designed and manufactured with international advanced technology, and the gas volume can reach 500 ~ 70000m3 / h, which can fully meet the needs of coal mining industry. This pumping method has gradually become the mainstream. This method not only becomes the guarantee of safe production, but also becomes a new clean energy, which has strategic significance for China, a big coal country. Pumping while excavating and mining while pumping, that is, CBM drainage in the process of coal seam mining. After mining drainage, namely abandoned mine, mining roadway CBM drainage.
The drainage method is divided into: drilling drainage, drilling coal seam, and using loosening technology to increase the release area and conduction of coalbed methane, so as to make the rapid release of coalbed methane. Reduce the release in the process of excavation. This method has good effect and high utilization rate of coalbed methane. Generally, water ring vacuum pump / compressor is used for pumping. Roadway method drainage, the goaf roadway, mining roadway gas drainage, to ensure the safe concentration. It includes surface vertical well pumping, mixed pumping, etc.
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12.11.2021 06:50
