High and low temperature test chamber manufacturers analyze products
Many manufacturers of high and low temperature test chambers will think that product and promotion are two completely unrelated departments, each responsible for their own responsibilities, separating the lines of one product as the cutting point, but in fact, there is a constant gap between product and promotion. The relationship is still chaotic; the premise of promotion is the existence of this product, and the existence of the product can be promoted;
I have a friend who makes products, because there is very little communication between products and promotion; in order to complete the KPI indicators, the promotion department goes to some freelance mission websites to advertise, and they are placed according to the CPA of a recharged user. As a result, they are all wool customers. The user activation rate, registration cost, and recharge cost are all low, and the data is beautiful, but the repurchase rate of recharged users is very low; this will cause people to mislead that there is a problem with the product design. E was injustice; in fact, the reason was only because the real recharge rate did not reflect;
Let’s talk about a simple and easy-to-understand example. For example, if you want to order takeout, you usually order food on Ele.me. Today, Meituan takeaway is full of gifts. At this time, you will choose to order food on Meituan. Tomorrow Baidu takeaway We launched another red envelope event, so tomorrow you will order food on Baidu Waimai, so there will never be only one food delivery app on a person’s mobile phone. The user’s mentality just wants to satisfy my ordering needs while still being able to do so. There is feedback, so why not do it.
In short, the product and promotion are closely connected. Only when the two are combined can we find the weak points of the product, and can prescribe the right medicine to make the product better. Therefore, the manufacturers of high and low temperature test chambers tell everyone that promotion cannot be independent of the product. Otherwise, it will only have a negative impact on your own business.
Temperature shock test chamber refrigeration system
1. Refrigeration system and compressor: In order to ensure the cooling rate of the test chamber and the minimum temperature requirements, the temperature shock test chamber adopts a binary cascade water-cooled refrigeration system composed of a set of imported German semi-hermetic compressors (need to be installed outdoors The circulating cooling water tower with 10 tons of cooling water per hour is provided by the user). The cascade cold system consists of a high temperature refrigeration cycle and a low temperature refrigeration cycle. The connecting container is an evaporative condenser. The evaporative condenser also plays a role in energy transfer. The heat energy in the working chamber is transferred out through the two-stage refrigeration system to achieve high temperature. the goal of. The design of the refrigeration system applies energy adjustment technology. An effective treatment method can ensure that the energy consumption and cooling capacity of the refrigeration system can be effectively adjusted under the normal operation of the refrigeration unit, so as to reduce the operating cost of the refrigeration system. And the failure rate drops to a more economical state. 2. The working principle of refrigeration: Both high and low refrigeration cycles adopt reverse Karuo cycle, which consists of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is adiabaticly compressed by the compressor to a higher pressure, and the work is consumed to increase the temperature of the exhaust gas. After that, the refrigerant exchanges heat with the surrounding medium through the condenser isothermally, and transfers the heat to the surrounding medium. After the refrigerant expands through the valve adiabaticly to do work, the temperature of the refrigerant decreases. After zui, the refrigerant absorbs heat isothermally from the higher temperature object through the evaporator, so that the temperature of the cooled object is lowered. This cycle repeats itself to achieve the purpose of cooling down. 3. Refrigerant: adopt DUPONT company R404A (high temperature cycle), R23 (low temperature cycle); 4. Auxiliary parts: expansion valve (USA SPORLAN), solenoid valve (Italy CAS); filter (USA SPORLAN); pressure controller (British American RANCO); oil separator (European and American ALCO) and other refrigeration accessories are imported. 5. Thermal shock test chamber, equipped with automatic and manual defrosting circuits 6. U-TYPE eel sheet type high-speed heating electric heating tube 7. Internal spiral K-TYPE refrigerant copper pipe 8. *Electricity-saving rate compressor (using German "Copeland" water-cooled compressor) 9. Slope type FIN-TUBE evaporator 10. *Solenoid valve, filter drier, capillary and other freezing components; 11. Adopt air-cooled condenser; 12. The refrigerant uses high-stability R404 and R23 environmentally friendly refrigerants; 13. The refrigeration system adopts binary refrigeration (cascade type) to be fast and stable; 14. Multi-wing circulating fans are used in the heat storage area and cold storage area to force air convection to improve the uniform temperature effect. 15. Both the cold and hot zone and the test zone adopt PID+SSR microcomputer to control the temperature, and the automatic calculation can achieve the control accuracy.
The UV aging box is mainly used to test the anti-UV aging performance of outdoor products. Therefore, in the process of production and use, we need to comply with some standards established by many countries. Only qualified equipment can be tested if it meets the standards. To be adopted. But what are the standards to be followed during the use of the UV aging box?
There are many standards for UV aging boxes, such as passing standards (the most common), coating standards, textile standards, printing ink standards, adhesives and sealants, and so on.
The standards to be followed during the use of the UV aging box are not the only ones, but it is best for everyone to understand before using it to avoid being misled by the subsequent wrong test results, which will cause the enterprise to lose a lot of money in mass production.
The UV lamp aging test uses fluorescent UV lamps to simulate the destructive effects of sunlight on durable materials. This is different from the aforementioned xenon arc lamp. The fluorescent ultraviolet lamp is similar in electrical principle to ordinary cold-light fluorescent lamps for lighting, but can generate more ultraviolet light instead of visible light or infrared light.
For different exposure applications, there are different types of lamps with different spectra to choose from. The lamp can simulate sunlight well in the main short-wavelength ultraviolet spectral range. The spectral energy distribution (SPD) of the UVA lamp is very similar to the spectrum obtained at 360nm in the solar spectrum. UVB lamps are also commonly used lamps for accelerated artificial weathering tests. It destroys materials faster than UVA lamps, but its energy output with a wavelength shorter than 360 nm will cause deviations from actual test results for many materials.
Although the national standard stipulates and the currently prevailing domestic aging test method is xenon arc radiation, xenon arc radiation and ultraviolet light aging tests are both widely used test methods abroad. These two methods are based on completely different principles. The xenon lamp irradiates the test chamber to imitate the entire solar spectrum, including ultraviolet light, visible light and infrared light, and its purpose is to simulate sunlight. The ultraviolet aging test does not attempt to imitate the sun's rays, but only imitates the destructive effect of the sun's rays. It is based on the principle that durable materials that are exposed outdoors for a long time will have greater aging damage caused by shortwave ultraviolet light.
Aging detection is a process of simulating various factors involved in the actual use conditions of the product to carry out corresponding conditions and strengthening experiments. This experiment is mainly for plastic materials. Common aging mainly includes light aging, damp heat aging, and hot air aging. . The product is used outdoors for a long time under the sun. If you want to know the life of the product can be used outdoors, it is necessary to simulate the sun's ultraviolet light to perform a UV aging experiment. Of course, the intensity of the experiment is much greater than the actual outdoor light intensity, thus shortening the test time , You can understand the aging status of the product after how many years of use through a short-term test.
Aging detection test range
Plastic/rubber products (including PP, PVC, natural rubber, etc.), especially product plastic shells, plastic fasteners, etc.
Coating/adhesive products (industrial coatings, architectural coatings), especially coatings for outdoor use.
Outdoor decorations (including outdoor light boxes, outdoor electroplating parts, etc.). More test ranges should be determined according to specific test requirements.
The breakdown of products that can be tested by aging test is as follows:
The aging test of plastic products includes: plastic particles, plastic wires, plastic ropes, plastic belts, hoses, rigid pipes, corrugated pipes, plastic sheets, plastic films, plastic switches, plastic doors and windows, plastic rods, artificial leather, cables, foam materials, plastics Profiles, car accessories, etc.
Advantages and disadvantages of manual and electric friction fastness tester
When purchasing a color fastness tester, you should choose a manual rubbing color fastness tester or an electric rubbing color fastness tester according to the actual situation, instead of just looking at the low price to buy. This article introduces manual and electric rubbing color fastness testers. Pros and cons.
Comparison of advantages and disadvantages of manual and electric friction fastness tester
1. Price: The manual rubbing color fastness tester has a simple structure and is driven by manpower. If the test is frequent, the labor cost often exceeds the price of the electric rubbing color fastness tester.
2. Convenience: The electric friction color fastness tester realizes one-key automatic operation, fast speed, easy to understand, automatic operation and other advantages.
3. Accuracy: The electric rubbing fastness tester is controlled by a microcomputer, and each step is precisely controlled. The accuracy of the result is better than the manual rubbing color fastness tester.
4. Life: The manual rubbing color fastness tester is prone to misoperation and damage to the device.
5. Maintenance: The manual rubbing color fastness tester has a simple structure, so the maintenance is relatively simple.
6. Standard: Manual and electric rubbing color fastness testers support the same standards.
7. After-sales service: Provide users with timely, thoughtful and complete after-sales service under the principle of non-profit. Respond to failure repairs within 24 hours, 1 year warranty and lifetime maintenance commitment.
We provide reasonable price and high quality rotary rubbing color fastness tester. All the testing instruments manufactured by qinsun factory are well-known throughout China and more than 50 countries abroad for providing superior value and performance.
Rotary rubbing color fastness tester is suitable for the material damage and surface color transfer degree evaluation of upper material, leather, plastic, textile and other color materials after being rubbed by foreign objects. There are five test methods, including dry, wet, perspiration, alcohol and organic solution. The specimen is evaluated against the grey scale after rubbing against the rotating wool felt.
Follows are features of the tester:
With memory function, the current record will remain when unexpected power off or shutdown happens; High stability with low noise.
An IP PBX is a PBX that supports the IP protocol to connect telephones by using an Ethernet or packet-switched LAN. It sends voice conversations in IP or data packets. An IP PBX may have multiple interfaces. These include interfaces for a data network and other interfaces that allow for a connection to a telephony or circuit-switched network.
The development of real-time Internet protocols has made it possible to successfully send voice and fax messages over a data network. Such real-time Internet protocols include the VoIP protocols used with Unified Messaging: Session Initiation Protocol (SIP) over Transmission Control Protocol (TCP) for voice messaging.
These protocols have made it possible to successfully send voice and fax messages over a data network. Real-time VoIP protocols are required to send voice messages over a packet-switched or data network so the delivery order and timing of data packets can be maintained and controlled. If these protocols weren't used to maintain and control the delivery and timing of the data packets, a person's voice would be broken up and sound incoherent or the images might appear garbled.
Lower cost. VoIP providers can offer more competitive pricing for a couple of reasons. VoIP is not regulated by the FCC and is not subject to the same taxes as standard phone companies. And VoIP providers don’t have to pay costly interconnection charges to another company’s network.
Data and voice integration. VoIP phones come with useful features such as e-mail-based voice mail, where your messages are sent to you as audio files in your e-mail. You no longer have to call the office to retrieve your voice mail messages.
Mobility. You can take your VoIP phone number with you anywhere in the world. Imagine visiting Japan and having your phone ring in the hotel room whenever someone dials your New York phone number. This is especially handy for geographically dispersed teams, who can now avoid international phone rates by using VoIP phones with phone numbers in the same area code.
In addition to the obvious functionalities such as receiving and sending calls, a virtual switchboard can be adapted with specific options for hotels.
Do not disturb mode. You can configure the times when the customer does not want to receive calls in the room.
Alarm clock. You can configure it so that the client receives a call with a recording where they are given the “good morning” or the message that is convenient.
Connection with the departments. The auto-attendant function allows the client to contact the different departments from the room by a dialing system.
Interruption of the connection. It is possible to deactivate the phone in the unoccupied rooms.
International numbering. The hotel can manage its own switchboard to automatically answer calls in the corresponding language.
Displaying the name. Calls made from the room to the reception or room service can be displayed with the name of the guest. This allows a closer and more friendly treatment.
Statistics. The statistics function allows the hotel to know the most requested services by the clients. It also provides the customer with a record of calls made during their stay.
VOIP is an acronym which stands for "Voice Over IP".Most of us are familiar with the "Public Switched Telephone System” (PSTN), which allows us to contact people around the globe by dialling a sequence of numbers. VOIP offers an alternative, which works by routing digitised voice signals over IP networks, such as Company Intranets, or in some cases the public Internet.
On the face of it, the PSTN hasn't really changed much in more than 100 years. There have been many technology changes and improvements, such as tone dialling and Caller ID, but as far as the user is concerned, it's still a matter of dialling (more recently, pressing) a sequence of numbers, and getting connected to the person who's number was dialled. However, what happens behind the scenes to make this happen has changed considerably in recent years.
VOIP isn't a particularly new technology; there are papers and patents about the subject dating back several decades, and there was some early VOIP software available as early as 1991. The basic principle is pretty simple; it is essentially the same technology that is used to stream music across the internet. Voice sounds are picked up by a microphone and digitised by the sound card. The digitised audio is then compressed using an audio codec. This works by removing unneeded data, while maintaining the legibility of the audio, to make the stream compact enough to be sent in real time over the network.
IP stands for Internet Protocol and is the standard protocol for transferring information over the Internet between computers and other devices. The same standard is normally used in local networks too. An IP address is the unique network address that a computer has in the network. An IP phone is a phone that, like a PC, is connected to the network/Internet. Like the PC, it has an IP address and the call is transmitted as data packets over the network. Calls can be made from an IP phone to other IP phones (without leaving the network) and to regular phones over the public telephone network.
SIP stands for Session Initiation Protocol and is a standardised protocol (communication regulations) for connecting phone calls via networks – in most cases via the Internet too. To make and receive calls, the phone has to be registered to a SIP switch. The switch can be a company PBX or be located with an IP telephony service provider. The SIP switch ensures that the call is connected to the right address within the network or sends the call to the public telephone network if the recipient is not registered as an IP telephone in the same SIP switch. An IP phone can be moved and used literally anywhere. The only requirement is for it to be connected to the network/Internet and have contact with the SIP switch where it is registered.
A VoIP phone system is a technology to make phone calls through your internet connection instead of a regular landline or a mobile network. A VoIP system converts analog voice signals into digital signals over your broadband connection. A VoIP server is used to connect calls to other telephone networks.
As long as you have a high-speed internet connection, which includes a router and modem, you are ready to use a VoIP.
A typical VoIP configuration involves a desk phone and a SIP server, which is typically a VoIP service provider. It works even better than your traditional landline phone because it offers many more features than what analog phone service could ever provide.
Since VoIP runs over the internet, your data is stored securely in the cloud. You can manage the VoIP system through an online dashboard. This dashboard allows users to adjust contacts, business phone numbers, call forwarding, and add new phone numbers.
The reason of vacuum failure of water ring vacuum pump
As one of the common equipment of dehydration parts in paper mill, water ring vacuum pump can be used for suction water tank and vacuum roller to draw water in the paper. The working principle is: before starting the water ring pump, water ring is formed at the rim by rotating the cylindrical impeller after the start-up. Because the cavity shell of the pump body is oval, the water ring rotating with the impeller wheel will be pushed in and out in the impeller chamber, resulting in vacuum and pressure transmission.
After two or three years of use, the vacuum suction capacity of water ring vacuum pump will be decreased. There are also some problems in the vacuum suction capacity of many 2BV water ring vacuum pumps used in a paper mill. Later, the whole vacuum pump was disassembled and inspected, and the reason for its failure was finally found.
1. many cavitation pits of different sizes and shapes are formed on the blades of impeller, which are more serious in the rim part, and the largest cavitation pit can reach 60 × 15 × 30mm3.
2. the tolerance of the matching between the elliptical cavity shell and impeller of the pump body becomes larger.
Reciprocating vacuum pump is a double acting vacuum pump made in the former Soviet Union. It is composed of piston, air valve, cylinder, crosshead, connecting rod, crank and other parts. The bearing bush and cylinder of vacuum pump are supplied by special lubrication system. The lubricating oil brands are large and the consumption is large. Due to the high heat generated by gas compression, the room temperature is still as high as 40 ℃ in summer, even though it is equipped with cylinder cooling system, which is unfavorable to the equipment and the body. Moreover, the maintenance of the equipment is inconvenient, the failures are frequent, the maintenance period of cylinder cleaning and pad grinding is long, and the consumption of spare parts is large.
2be water ring vacuum pump is a single-stage and single action vacuum pump produced by referring to foreign advanced technology. It is an energy-saving product. 2be water ring vacuum pump adopts axial suction and exhaust structure, mainly composed of pump body, impeller, main shaft, drive side distributor, non drive side distributor side cover, automatic drain valve and other parts. The impeller is eccentrically installed in the pump body. When the impeller rotates, the pump body is affected by centrifugal force and forms a rotating liquid ring on the inner wall of the pump. The gap between the impeller end face and the adapter is sealed by liquid. During the rotation process of the impeller at the first half rotation (passing through the suction hole), the volume of the sealed cavity gradually expands, and the gas is inhaled from the suction hole, and then rotates in the latter half rotation (passing through the exhaust hole) In the process, the sealing volume gradually reduces, and the gas is discharged from the exhaust hole to complete a gas extraction process.
Influence of pipeline on the performance of rotary vane vacuum pump
For users, the diameter of the suction pipe should be the same as the diameter of the pump port, and the length should be as short as possible. Too many elbows and too long pipeline will not only affect the pumping speed, but also affect the power consumption. Exhaust pipe is also the same, exhaust pipe is the most easily ignored by users, too long pipe will increase exhaust resistance, increase gas backflow, affect pumping speed, and increase power consumption.
The oil mist eliminator of rotary vane vacuum pump developed by us, which is connected to the exhaust port of the pump, can meet the requirements of gas indoor emission. Of course, the oil mist eliminator will inevitably lose part of the power. After careful design and repeated improvement, not only the exhaust resistance is small, but also the effect is very good, and the increase of power is not obvious. It should be noted that the core of the oil mist eliminator must be replaced regularly according to the use condition.
Roots vacuum pump must be equipped with the front stage pump, roots pump can not be used alone. Roots pump is mostly used in Roots vacuum unit, its function is to improve pumping speed and vacuum degree of the front stage pump. Roots pump should be equipped with bypass valve in the connection with the front stage pump, which can effectively protect roots pump. If the air extraction of front stage pump is unstable or other factors lead to abnormal operation of the whole unit, roots pump with bypass valve will protect roots pump and prolong the life of the whole vacuum unit.
When choosing roots pump, it is necessary to pay attention to which sealing method of wearing parts of roots pump is. Roots pump adopts mechanical seal, which can effectively improve the working efficiency of roots pump. If the sealing mode of roots pump is shaft sleeve seal, the working efficiency will be greatly reduced. Special attention should be paid to the selection of roots pump.
If the vacuum degree of roots pump is reduced in the process of use, it is necessary to check whether the clearance between roots pump rotors changes. If the rotor clearance of roots pump becomes larger, it is necessary to replace roots pump, because such roots pump does not make static and dynamic balance for Roots pump rotor in the process of production and processing, or it is sealed by shaft sleeve.
Application and characteristics of multistage pump
The multi-stage pump has the characteristics of high power, safe and stable operation, low noise and long service life. For transporting clear water or liquid with physical and chemical properties similar to water, it can also be used to transport oil, corrosive or abrasive media by changing the raw materials of pump overflow parts, sealing methods and adding cooling system.
It is mainly used for pressurized water supply of industry and high-rise buildings, fire-fighting pressurization, long-distance water supply, heating and other cold and warm water circulation pressurization and equipment matching, etc. it is suitable for small boiler water supply.
The multistage pump is multistage and segmented type. The suction inlet is located on the water inlet section in a horizontal direction, and the discharge outlet is vertical and upward on the water section. The lift can be increased or decreased according to the use needs. Whether the water pump device is excellent or not has a great influence on its function. The outlet of each impeller and the inlet and outlet center of the guide wing will reduce the flow of the water pump and the power difference of the head. It is necessary to pay attention to it when repairing the device.
The main parts of multistage pump are: water inlet section, middle section, water outlet section, guide vane baffle, shaft, sealing ring, tail cover and bearing body. The water inlet section, water outlet section and tail cover are made of cast iron, which together constitute the working room of the pump.
SK series water ring vacuum pump and compressor system is composed of vacuum pump (compressor), coupling, motor, air-water separator and bamboo circuit.
The working process of vacuum pump, compressor and gas-water separator is as follows: the gas enters the vacuum pump or compressor through the valve through the pipeline, then it is discharged into the gas-water separator through the air guide pipe, and then it is discharged through the exhaust pipe of the gas-water separator. When it is used as a compressor, the gas-water mixture discharged by the compressor is in the water separator. The gas is delivered to the system to be pressurized through Langmen, while the water is left in the gas-water separator. In order to maintain a certain water level of the gas water separator, an automatic overflow switch is installed, When the water level is higher than the required level, the overflow switch is turned on. Water overflows from the overflow valve: when the water level is lower than the required level, the overflow switch is turned off, and the water level in the gas-water separator rises to the required level. The working water in the vacuum pump or pressure machine is supplied by the gas-water separator (or tap water). The size of the water supply plate directly affects the performance of the vacuum pump, so the water supply pipe Valve control on.
The difference between gas suction system and pressure delivery system is that the internal structure of gas-water separator is ignored. When pumping gas, the pressure at the suction port is lower than the atmospheric pressure, while the pressure at the exhaust port is equal to the atmospheric pressure, and there is only overflow pipe in the gas water separator: when pressing gas, the suction port is under atmospheric pressure (or vacuum state), and the pressure at the exhaust port is at a atmospheric pressure. In order to ensure the delivery gas pressure, the water level of the gas water separator is controlled by the overflow switch.
Because in the working process, work produces heat, which will make the working water ring hot, and a part of water and gas are discharged together, therefore, in the working process, the pump must be constantly supplied with water to cool and supplement the water consumed in the pump to meet the working requirements of the pump. When the gas discharged from the pump is no longer used, a gas-water separator is connected at the exhaust end of the pump (a water tank can be made by yourself to replace it). After the waste water and part of the water are discharged into the gas-water separator, the gas is separated, the gas is wiped out by the wiping gas pipe, and the left water is supplied to the pump for further use through the return pipe. With the extension of working time, the temperature of working water will increase continuously. At this time, a certain amount of cold water (tap water) shall be supplied from the water supply of gas-water separator to reduce the temperature of working water and ensure that it can meet the required technical requirements and performance indicators.
When it is used as a compressor, the pump exhaust 11 is connected with a gas water separator, and the gas water mixture enters the gas water separator and then automatically separates, The gas is sent from the exhaust pipe to the required system, and the working water passes through the automatic When the switch is overflowed and the compressed gas is discharged, the working water is very easy to heat up. When the water is discharged from the pump outlet, the temperature will become higher. Therefore, at the bottom of the gas-water separator, the cold water shall be continuously supplied to supplement the discharged hot water and play a cooling role when necessary, so that the temperature of the working water will not be too high, so as to ensure the performance of the compressor, meet the technical indicators and meet the process requirements.
In recent years, a new type of vacuum pump has been developed, which can be realized with only one pump, from atmospheric pressure to high vacuum. But generally speaking, in order to obtain high vacuum, ultra-high vacuum and ultra-high vacuum, a series of vacuum pumps are used to complete the pumping task. Therefore, it is very important for the user to know the working principle, main performance, structural characteristics and classification of the pump.
Vacuum pump is a device used to produce, improve and maintain vacuum. According to its working principle, it is basically divided into two types: gas transfer pump and gas capture pump. The gas transfer pump is a vacuum pump which can make the gas continuously inhale and discharge out of the pump to reach the suction port. This kind of gas transfer pump includes two kinds: positive displacement pump and momentum transfer pump.
1. Positive displacement vacuum pump
The volume vacuum pump is a device that uses the periodic change of the volume of the pump cavity to complete suction, compression and exhaust. The gas is compressed before being discharged. This kind of pump is divided into reciprocating type and rotary type.
(1) Reciprocating vacuum pump uses the reciprocating motion of the piston in the pump cavity to draw in, compress and discharge the gas. Therefore, it is also called piston vacuum pump.
(2) Rotary vacuum pump uses the rotary motion of the piston in the pump cavity to suck, compress and discharge the gas. There are many kinds of pumps of this kind.
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17.11.2021 06:57
