What is the difference between a worm gear reducer and a gear reducer?

Compared with the gear reducer, the worm gear reducer has a self-locking function. Worm gear reducers for lining trolleys are widely used in the mechanical field because of their self-locking function, such as tunnel lining trolleys, winches, packaging machines, printing machines, conveying equipment, and so on. However, it is also because of the frictional transmission method of the worm gear, which also causes the transmission efficiency of the worm gear to be much lower than that of the gear transmission. This is where the worm gear reducer is insufficient.

worm gear reducer

In the transmission mode of the worm gear reducer, the worm gear transmission has the characteristics that other gear transmissions do not have. That is, the worm can easily rotate the worm wheel, but the worm wheel cannot rotate the worm. This is because the structure and transmission of the worm wheel and worm are realized by friction.

Not all worm gear drives have a good self-locking function. The self-locking function of the worm gear can only be achieved when a certain speed ratio is achieved, and the self-locking effect will be better. This is related to the lead angle, that is, the self-locking function of the worm gear reducer with a small speed ratio is not so ideal.

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Safety technical measures and precautions for oil tank truck loading and unloading operations

In order to reduce the occurrence of tank truck loading and unloading accidents, a few precautions for tank truck loading and unloading operations are hereby posted:

1. Safety technical measures:

(1) Reliable electrical connections and grounding should be made between the loading and unloading facilities of automobile oil tank trucks, including crane pipes, oil pipelines, and metal oil loading platforms.

(2) The ground scales, crane pipes, fueling guns, pipelines, etc. of the oil loading and unloading site should be bridged and equipped with electrostatic grounding devices. The grounding resistance is not more than 100Ω.

⑶ The fuel delivery site for automobile tank trucks should be equipped with a copper core soft stranded wire with a cross-sectional area of ​​not less than 4mm2 and one end connected to a paint-breaking alligator clamp, special connecting clamps, etc., so as to be connected to the body of the tank truck; One end should be connected to a grounding device.

⑷Automobile tank trucks used to transport refined oil should use rubber towing belts, and metal towing belts are prohibited.

⑸Baffle plates should be installed in the oil tank of the automobile tanker. It is forbidden to use non-baffle tank trucks to transport easy fuel products.

⑹The resistance between the oil tank and the car body shall not be greater than 106Ω. The resistance value of the conductive path between any two points in the metal pipeline or on the conductive parts inside the oil tank and the end of the mopping tape shall not be greater than 5Ω.

⑺ When the tanker truck is filled with oil, the maximum safe flow rate of crane pipes of different diameters should meet the requirements of the following table.

Maximum safe fuel filling flow rate of tank car (the number in brackets is the corresponding flow m/s)

Diameter of crane tube

Oil filling method 80 90 100 110 120 150

Top loading 6.0 (110) 5.5 (125) 5.0 (140) 4.5 (155) 4.2 (170) 3.3 (210)

⑻The connection between the electrostatic grounding wire and the tank car should meet the following requirements.

① The connection should be tight and reliable, and winding connection is not allowed.

②Connect before opening the tank lid.

③It should be connected to the special ground terminal board of the tanker, etc., and it is not allowed to connect within 1.5m of the loading and unloading oil port.

④Remove the connection after closing the tank lid.

⑼ During the operation, the light oil products should be loaded and unloaded in strict accordance with the relevant operating procedures. It is strictly forbidden to conduct gauge, temperature measurement, sampling, or insert other objects into the tank after 2 minutes of unstable oil.

⑽ When the tanker uses top-loading oil, the oil-loading crane pipe should go deep to the bottom of the tank, and the distance from the bottom of the tank should not be greater than 200mm. Splashing light oil is strictly prohibited.

⑾Original oil tanks with high volatile oil products (including tankers) should be tested for the concentration of oil and gas in the tank when replacing low volatile oil products. When the concentration of oil and gas exceeds 25% of the lower explosive limit, ventilation or cleaning should be carried out.

⑿In the process of loading and unloading flammable fuel products, no field test or test that may generate static ignition sparks is not allowed without approval.

⒀It is strictly forbidden to wipe and test vehicles, objects or the ground in the workplace, and conduct various temporary operations that may cause static electricity hazards.

2. Safety precautions

1. Operators should wear clothes and shoes that can discharge static electricity.

2. Use tools that do not produce sparks.

3. It is forbidden to work during thunderstorms.

4. Pay attention to observe to prevent oil spills.

5. When oil spills or oil leakage are found, all oil filling operations at the relevant oil filling point and adjacent oil filling positions should be stopped immediately. All valves that are open when unloading or filling the lower part of the oil should be closed. Only key personnel should be left on the oil loading platform. Do not operate the starter of the vehicle until the spilled oil is cleaned up. The oil filling shall not be resumed until the person in charge of oil filling declares that the area is safe.

6. If a fire alarm occurs during oil loading and unloading, all operations should be stopped immediately, and unaffected vehicles should be driven away immediately. Close the oil tank valve to cut off the oil source, and immediately implement fire extinguishing operations.

7. It is not allowed to turn on the ignition switch for a long time after the car is stopped. A car once caught fire on its own in the garage. After investigation, it turned out that the ignition switch was still on after returning from the car last time. If it is turned on for a long time, it will not only cause the battery to discharge for a long time, but also cause the danger of fire.

8. It is not allowed to implement “self-flowing oil supply” for a long time. Sometimes due to the damage of the gasoline pump or the damage of the oil pipe joints, the gasoline pump cannot normally supply fuel to the carburetor, and it cannot be repaired temporarily. Only emergency treatment and self-flow fuel supply can be taken to drive the car back to the yard or drive to repair plant. At present, for the purpose of fire prevention, the road traffic management regulations formulated by the state do not allow this method to be used.

9. Open flames are not allowed to observe the height of the battery liquid level at night. When driving, the battery is in an overcharged state, and the excessive hydrogen accumulated in the shell causes an explosion when it encounters an open flame. Therefore, the small holes on the battery cover must be kept unblocked at ordinary times.

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The difference between a sewage suction truck and a septic tank truck

Many people think that there is no difference between a sewage suction truck and a septic tank truck. This is wrong. If you choose the wrong vehicle, it can cause inconvenience after buying the car, spend unnecessary expenses, or even use it, you must be sure before choosing a vehicle It is necessary to figure out your own purpose and use goals, and make clear the purchase of a car. Let me tell you the difference between a septic tank truck and a sewage suction truck.

The septic tank truck and the sewage suction truck have the same principles and are composed of three three principles: the vehicle chassis, the tank body, and the vacuum system. The difference lies in the tank body, so the purpose is greatly different. It can be said that the sewage suction truck can be used as a septic tank truck, but the septic tank truck cannot be used as a sewage suction truck, and it does not have the function of a sewage suction truck. The cost of a septic tank truck is more expensive than a sewage suction truck. Greatly reduce, don’t listen to unscrupulous merchants.

septic tank truck

Septic tank truck and sewage suction truck tank distinction

The tank body of the sewage suction truck adopts a round tank body. The advantage of the tank body can be 45 degrees. The tank body can be lifted by a double hydraulic tripod (no residue on the tank body). The back cover of the tank body can be opened at a right angle of 90 degrees. (There is no restriction on the sewage discharge of the tank body. , As long as there is nothing that can be pumped in, it is mainly used for pumping septic tanks, farm feces, sewage sludge and stones, with thicker sediments and objects with more debris.
The tank body of the septic tank truck adopts an oval tank body. The tank body is integrally sealed and has a simple structure. It is mainly used for pumping septic tank feces and sewage (the tank body has limitations, such as stones, bricks, and non-liquid objects. It is difficult to discharge , Difficult to clean up.)

Both cars are equipped with self-extracting and self-draining devices, which are simple to operate and easy to use. Before you buy a vehicle, you must figure out your purpose. Where is the main job used, such as simply pumping a septic tank, buy a septic tank truck. If the job is diversified, be sure to buy a sewage suction truck to avoid future troubles.

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How to choose a tanker manufacturer?

Nowadays, there are many tanker sales manufacturers, and the quality of production varies. Some tank truck manufacturers are shoddy and have frequent after-sales problems. How to circumvent those product traps and choose a satisfactory tanker has become a headache for every car owner. Let’s let the editor of the tanker sales manufacturer CIMC Linyu solve this problem for everyone. Remove the gorgeous coats of major manufacturers and select the best quality products.

1. Look at the audience

The ‘Matthew Effect’ is a term in social economics, which means that the stronger the stronger. The pros and cons of a product can be macroscopically evaluated from the market share and frequency of use.

2. Look at the scale

Tank semi-trailers are large-scale transportation equipment and have certain requirements on the scale of production. You can imagine vehicles made by factories that are too small.

Mixer truck
3. Look at history

Making tank semi-trailers requires continuous research and development and improvement of technology for a long time, and many production technologies cannot be matured in a short time. This is why the products made by some newly established manufacturers look good, but there are constant after-sales problems.

4. Look at the technology

Some manufacturers of other products have seen that the domestic aluminum alloy tanker market has developed well in recent years, and they have started liquid tankers one after another. Find a few college students, get a few pieces of equipment, and start making tank semi-trailers. As a result, after-sales problems continued, which brought trouble to both myself and the customers.

Mixer truck

5. Look at users

The choice of the user is the only criterion for testing the quality of the product. Which product is favored by high-end and demanding users, and which product is the best quality.

CIMC Vehicle Group is principally engaged in the manufacture and sale of semi-trailer and special-purpose vehicles. Since the beginning of 2002, it has been manufacturing and selling semi-trailers. Since 2013, the company has maintained the world’s number one semi- trailer sales for five consecutive years. The semi-trailer product line mainly includes Jiping semi-trailer, warehouse semi-trailer, tank semi-trailer, refrigerated semi-trailer and van semi-trailer; the top product line mainly includes the top loading of dump truck and mixer truck. In 2017, CIMC vehicles launched the first generation of center-mounted axle cars in the Chinese market.

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Ten knowledge of concrete mixer truck, how many do you know?

What should I pay attention to when driving a concrete mixer truck?

To drive a concrete mixer truck, for experienced drivers, general knowledge of safe driving is good. What I want to remind here is that because the concrete is fluid, when the vehicle turns sharply, the speed must be reduced to prevent the centrifugal force generated by the concrete from making the vehicle unstable!

What are the effects of more concrete on the mixer truck?

The mixer trucks below 9 square meters are loaded with more concrete, and the truck will leak during the climbing process; if the 12-square truck mixers are loaded with more concrete, the mixing will be layered, the concrete sand rate will be low, and the particle size of the stones will be too large. Pumping a lot of pebbles.

concrete mixer

New mixer trucks are generally prone to problems after a few years of operation?

It usually takes five years to pull dry materials and seven years for wet materials. Generally, mixer trucks are prone to problems after 3 years. The problems of mixer trucks have a lot to do with personal maintenance and manufacturers.

What should I do if the concrete solidifies in the mixer truck?

After the concrete is solidified, its main components are dicalcium silicate and tricalcium silicate. In theory, hydrochloric acid can react with it to release its solid state. But in fact it is difficult to operate, because the feed port of the mixer truck is very small, the amount of hydrochloric acid is difficult to control, and the hydrochloric acid can also react with the tank body of the mixer truck. In fact, this situation is often cut through the tank with electric welding or gas cutting, and then the solidified concrete is mechanically broken.

What is meant by the top of the mixer truck?

The top of the mixer truck refers to things other than the chassis fender, including the mixing tank and support, the inlet and outlet hopper, the hydraulic system and the reducer, the water tank and the pipeline, the operating linkage mechanism, etc.

Are the hydraulic systems of general mixer truck manufacturers domestic or imported?

Generally, the manufacturer will choose the installation according to the size of the mixer and the needs of the customer. The standard configuration of 6 square meters or less is the domestic system (optional import), and the standard configuration of 6 square or more is the imported system.

Is the hydraulic pump of the small square volume mixer better the selected volume pump or the variable pump?

The hydraulic pump is the main component of the mixer truck. Generally, the mixer truck with less than 6 square meters is the standard fixed pump, but it is recommended that the customer choose the variable pump.

concrete mixer

What is the welding process of the mixer truck?

Nowadays, most manufacturers use fully automatic seamless welding for the welding of the entire car, and both the circumferential and longitudinal seams use fully automatic seamless welding.

What is the payment method for the mixer truck?

There are many payment methods for mixer trucks. You can buy the car in full or in installments. Generally, manufacturers will have certain discounts for the full amount of the car. There is no discount on installment payments, and the interest is equal to the bank interest.

What should I do if the concrete mixer truck is exhausted?

Is there a better way other than adding water?

If it is because of the concrete, it depends on whether the slump is too small or the strength of the concrete is too high, or the reason is that the concrete is too sticky. For the above reasons, the concrete can be adjusted appropriately according to the construction requirements; if it is always bad For the next step, it is necessary to consider whether there is a problem with the blade angle and the unloading port.

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What are the parts of the reduced iron briquetting machine?

The reduced iron briquetting machine is mainly used to directly cold-press metallurgical powders such as reduced iron into 3-6 kilograms of cylindrical or other shaped cakes under high pressure, which is convenient for storage, transportation and transportation, and is more convenient for the reduction of iron during the smelting process. The problem of not sinking on steel slag.

The reduced iron briquetting machine is mainly composed of the following components:

①Host: It is composed of frame, main hydraulic cylinder, pusher hydraulic cylinder, bottom hydraulic cylinder, matching mold frame and mold, pressure head, etc.

The frame part is composed of upper and lower beams and uprights. The upper and lower beams are all made of cast 45# integral steel parts. The upper and lower beams are connected by internal and external nuts with four columns to withstand the tension during work.
The main hydraulic cylinder eliminates steel castings and eliminates potential safety hazards. Ensure the service life and safety of the equipment.

The professional design of supporting mold frames, molds, indenters, and superior processing capabilities guarantee the excellent taste of the equipment. The punch of the die and the briquetting machine are equipped with high-strength wear-resistant steel that can be quickly replaced, model LINDUR-HDYJ420. The front end of the punch is equipped with a wear-resistant punch press ring that is easy to disassemble and install, so that it can extend its use. life. The relevant parts have been specially hardened or forged in the necessary parts.

②Hydraulic station: It consists of a motor, a hydraulic pump, a pump protection device, a professional control valve block and a piping system for connecting the briquetting machine. The design is reasonable and the quality is stable. Equipped with a cooling system to prevent the equipment from being unable to work continuously due to overheating of the oil.

③Console: It is composed of electrical system and plc control system.

Equipped with an adjustable text display, the action sequence and each action time are completely controlled by the PLC system, and can be adjusted by the operator at any time, which is convenient, fast, and easy to understand.

Our company is a professional manufacturer of development of briquetting machine. It is also the birthplace of China’s first high-pressure ball press, which filled the gap in China’s inability to produce that. In recent years, it has continuously introduced internationally-oriented and powerful double tooth-roller crusher, four tooth-roller crusher, powerful jaw crushers, hydraulic jaw crushers, special jaw crushers for carbon blocks, granulating, pelletizing and coking plants.

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How does the metal briquetting machine work?

The metal briquetting machine is a professional machine and equipment for forming metal powder materials in many fields such as the metallurgical industry and the energy industry. After the pressed metal powder is molded, it is very convenient and efficient in the use process. It also plays a role in the reuse of metal powder waste and saves resources.

The forming part is the key structure of the metal briquetting machine process. Whether its design is reasonable or not directly affects the forming quality of the metal briquetting machine. The main model of the metal briquetting machine is a pair-roll forming machine (that is, a ball press that people often call). It has a pair of cylindrical wheels with parallel axes, the same diameter, and a certain gap between each other. There are many on the roll skin. With hemispherical sockets of the same shape and size and regular arrangement, the pressing roller is the main part of the metal powder ball press.

The operating principle is: driven by the motor, the two wheels rotate at the same speed and opposite directions. When the material falls between the two pressure rollers, the joint begins to be compressed, and the raw material is produced between the corresponding two ball sockets. Volume compression; the roller continuously rotates, the ball socket is gradually closed, and the molding pressure gradually increases. When the distance between the two ball sockets is the smallest, the molding pressure reaches the maximum. Then the pair of rollers rotate to gradually separate the ball and socket, and the molding pressure decreases rapidly. Before the molding pressure is reduced to zero, the pressed metal powder begins to expand and break away, completing the whole process of pressing by the metal briquetting machine.

Performance characteristics:

1. After years of industrial use and improvement, the metal briquetting machine has obvious advantages such as high ball formation rate, low power consumption, compact structure, and easy maintenance and debugging. It is a relatively ideal press. Ball and granulation equipment.

2. The performance of the metal briquetting machine is similar to that of the coal briquetting machine and the desulfurized gypsum briquetting machine. It can press fluorite powder, mineral powder, metal powder, coal powder, coke powder and other materials to make them shape.

3. The metal briquetting machine is forced to squeeze the roller, so the product has the three characteristics of high density, high strength and high hardness, and the press roller of this machine adopts 650mn hard material, which has good wear resistance.

Suppressed material requirements:

1. The particle size of the material is 80-200 mesh.

2. Excessive impurities are not allowed in the material, otherwise the surface of the roller skin will be damaged.

3. The material supply must be satisfied, so that the ball formation rate can be guaranteed. The user needs to be reminded that the wear of the roller skin is severe when the metal is pressed into a ball. The user should pay special attention to the material of the roller skin when purchasing the metal briquetting machine, and it is best to use wear-resistant alloy forging.

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What are the advantages of super-high pressure briquetting machine products?

The super-high pressure briquetting machine can also be called a large-scale pulverized coal briquetting machine. It is a device that can press powdered granular materials into balls. The molding machine does not need to add a binder during the production process, and can be quickly and stably formed. The hardness of the finished ball can fully meet the needs of users. This super-high pressure briquetting machine can meet the production requirements of the entire briquette production line without purchasing mixers, dryers and other equipment. Luoyang Zhongyuan Mining Machinery Co., Ltd. can customize the ball press equipment according to the needs of users, provide free equipment configuration and quotation information, and reasonable site planning.

Product advantages of super-high pressure briquetting machine

1. Ability to customize finished products of different shapes according to customer needs;

2. The speed is stable, the molding rate is high, and the appearance of the pressed product is excellent;

3. With greater molding pressure, the quality of pressed products is significantly improved;

super high pressure briquetting machine

4. Smooth demoulding, less dust and less noise;

5. The molding system is stable and safe, the later maintenance workload is small, and the replacement of various parts is easy to operate;

6. Because the structure is relatively compact and simple, it occupies a small space and can work stably and continuously.

The hopper and spiral of the super-high pressure briquetting machine pre-presser can adjust the fine powder material with high gas content and strong fluidity. The silo and the feed inlet are enlarged to ensure sufficient material in the silo, and the material pressure of the pressing zone is greatly improved, which perform a better briquette forming effect.In addition,the whole silo adopt a closed structure,except for the air outlet,to ensure that the materials cannot overflow.According to our rich experience on briquetting, we have improved the lead, angle, length, precision of the spiral, so that the push material is more sufficient to facilitate the formation of the final briquettes.

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Description of the internal structure of the compound crusher

The compound crusher has a large crushing ratio, and the maximum crushing ratio can reach the output particle size. It can be adjusted arbitrarily, and is not affected by the hammer and liner wear; the structure adopts a non-screen setting, which crushes materials with high moisture content and large mud content. It is not easy to be clogged; the elastic adjustment mechanism is adopted, and the unbreakable materials can be automatically discharged without causing equipment damage; the bearings are arranged horizontally, with a long life, and can crush high-temperature materials (such as cement clinker); the rotor body structure of this machine is unique When crushing materials, the rotor body is hardly worn; the rear cavity is equipped with a screw rod or a hydraulic opening mechanism, and the wearing parts can be easily replaced without using the main equipment.

Structural advantages:

1. The structure is simple and reasonable, and the operating cost is low. Using the principle of rock-to-stone, the wear is small.

2. High crushing rate and energy saving.

3. It has the functions of fine crushing and coarse grinding.

4. It is less affected by the moisture content of the material, and the moisture content can reach about 8%.

5. The working noise is lower than 75 decibels (db level), and the dust pollution is less.

6. Suitable for crushing medium-hard and extra-hard materials.

7. The products are cubes with high bulk density and minimal iron pollution.

8. The impeller’s self-lining wear is small, and the maintenance is convenient.

compound crusher

principle:

The material falls vertically from the upper part of the machine into the high-speed rotating impeller, under the action of high-speed centrifugal force, and
The other part shunts the material around the impeller in the form of an umbrella to produce high-speed impact and crushing. After the materials collide with each other, they will form a vortex between the impeller and the casing. It is discharged to form a closed circuit for multiple cycles, which is controlled by the screening equipment to achieve the required finished product particle size.

The compound crusher is a kind of unscreened, adjustable fine crushing equipment optimized and designed on the basis of absorbing advanced fine crushing equipment at home and abroad. It can be widely used in the fine crushing of raw materials and clinker in cement plants, and can also be used for fine crushing operations. Dolomite, coke gemstone, lead-zinc ore, serpentine, blast furnace slag, coal gangue, phosphate rock and other medium-hard materials finely crushing operations, especially suitable for hard limestone, dolomite, granite, basalt and other artificial sand or high-speed Processing and crushing of road pavement stones.

Daily maintenance:

1. Regularly shut down and open the observation door of the vertical crusher to observe the internal wear of the crusher. The wear level of the center feed pipe, cone cap, upper and lower runner linings of the impeller, circumferential guard plate, and wear-resistant block should be replaced in time after wear. Or repair, and replace the wear-resistant blocks at the same time to ensure that the weight of the wear-resistant blocks is the same. It is strictly forbidden to open and observe the crusher during operation] to observe the internal working conditions, so as to avoid danger. If the impeller body is found to be worn, replace it in time and seek repair from the manufacturer.

2. The vertical crusher adopts special grade automotive grease or 3# lithium base grease. Appropriate amount of grease is added every 400 hours of work. After 2000 hours of work, the main shaft assembly is opened to clean the bearings. Generally, it works for 7200 hours and replaces the new bearings. The upper bearing of the main shaft assembly is the floating end, and the lower bearing is the fixed end. After assembly, the pulley should rotate flexibly when pulled by hand.

3. The tensioning force of the drive triangle tape should be adjusted appropriately to ensure that the triangle tape is evenly stressed. When driven by dual motors, the triangle tapes on both sides should be grouped and matched, so that the length of each group is as consistent as possible. It should be adjusted so that the current difference between the two motors does not exceed 15A.D. In the operation of the vertical crusher, because the equipment is a high-speed equipment, special attention should be paid to safe production. Relevant personnel should stay away from the equipment, and repairs should be carried out after shutdown if the machine needs to be repaired.

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What is the principle of magnetic bead method for nucleic acid extraction

The binding of nucleic acid to magnetic beads mainly relies on electrostatic, hydrophobic and hydrogen bonding. The DNA/RNA in the cell or tissue is released under the action of the lysis solution. At this time, the surface-modified superparamagnetic silica nanomagnetic beads “specifically bind” with nucleic acid to form a “nucleic acid-magnetic bead complex”. Then under the action of an external magnetic field, the complex is separated. After the eluate is washed to remove the non-specifically adsorbed magazines, desalted, and purified, the nucleic acid substance to be extracted is obtained.

The nucleic acid extraction principle is according to surface of superparamagnetic nanoparticles is modified and modified by nanotechnology to prepare superparamagnetic silica nanomagnetic beads. The magnetic beads can specifically recognize and efficiently bind with nucleic acid molecules on the microscopic interface. Using the superparamagnetism of silica nanospheres, under the action of Chaotropic salts (guanidine hydrochloride, guanidine isothiocyanate, etc.) and an external magnetic field, DNA and DNA can be separated from samples such as blood, animal tissues, food, and pathogenic microorganisms. RNA can be used in clinical disease diagnosis, blood transfusion safety, forensic identification, environmental microbiological testing, food safety testing, molecular biology research and other fields.

In fact, since testing institutions need to process a large number of samples every day, most of the nucleic acid extraction steps are carried out by means of an automatic nucleic acid extraction instrument with a magnetic bead method nucleic acid extraction kit.

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