Fog Cannon

Composition Of Underground Roof Support

The support equipment in the mine is often the Infrastructure Roof Support. It has a simple structure, low cost and can be recycled. Although there are many models of the Underground Roof Support, is the architecture of the Under Roof Roof Support the same for each model? Underground Roof Support is subject to high pressure, long support time and easy installation and deformation.

Structural composition of Underground Roof Support

The top beam is arc-shaped, and its number is divided into one section and multiple sections depending on the section size of the roadway, the force of the bracket, and the transportation conditions.

There are three types of legs: one is a circular arc at the top and the straight segment at the lower part; the second is all curved and has only one radius of curvature; the third is all curved, but has two curvatures. radius. A base is welded under the column leg, and the size of the base depends on the hardness of the bottom plate;

The connecting piece is a clamping device between the bracket section and the inter-section, which can be used for the connection between the joints, and can also press the two sections of the connected steel joints to provide a pre-tightening force, so that the U-shaped steel has frictional force, thereby ensuring The arched bracket has working resistance and shrinkage.

The role of the inter-rack tie rod is to enhance the overall relative stability of the bracket, and the brackets are coupled from the longitudinal direction to form a whole.

Check And Repair The Popcorn Machine

Popcorn machine is a common expanding food, common in the cinema, street, supermarkets, shops and other places, its taste delicious, taste by the majority of people love. Before buying a popcorn maker, customers often consult with a sales person about their specific profit analysis to calculate the cost.

Check and repair the popcorn machine

1. Turn on the power switch of the popcorn machine to check whether the short-circuit fuse of the device is broken.

2. Turn on the heating switch of the popcorn machine, the pot is not hot, the heating indicator is not on, and the safety is off. Please check whether the heater connection of the popcorn popper inside the pot is faulty, check the temperature controller is out of order, and the furnace coil connection is short circuit.

3. If the heating indicator light of the popcorn machine is not off for a long time and the temperature is too high, check that the thermal thermostat is out of order, and reset the Angle of the thermal thermostat to 180±10℃ or replace the thermal thermostat.

4. If the lighting constant temperature switch of the popcorn machine does not work, replace the bulb. If the thermostat of the popcorn popper has no temperature, check whether the thermostat of the bottom plate is short.

5. If the external metal sensing surface of the popcorn maker is too large, please check if it has a good grounding device.

How To Avoid Electric Shock In Medium Concrete Mixer？

1. If the power supply equipment of the medium concrete mixer is improperly selected or unmatched, it may cause electric shock and other safety production accidents.

2. The electrician is a special operator who must hold a certificate to work, otherwise, electric shock and other safety production accidents may occur due to the failure to understand the safe use of electricity.

3. If the operating personnel of the power distribution room has not been trained, if the concrete mixing plant lacks the knowledge of safe power consumption and operates illegally, which may cause an electric shock accident, how to avoid electric shock and cause other safety production accidents.

4. The operating rules and regulations, operating procedures, safety warning signs, safety production records, and inadequate safety protection facilities of the medium concrete mixer power distribution room may cause electric shock and other safety production accidents.

5. If the distribution room of the medium concrete mixer has no measures to prevent small animals from entering, it will cause electrical accidents due to small animals entering, and then cause other safety accidents.

6. If the lightning protection measures of the medium concrete mixer distribution room are not perfect, other safety production accidents will occur.

7. medium concrete mixer are prone to electric shock when working under the high-voltage line.

8. The power supply capacity and facilities of medium concrete mixer cannot meet the requirements of safe power consumption, which will affect their normal production.

Vacuum Packaging Machine Development History

Vacuum, the term is translated from the Latin vacuo, its meaning is nothing. In fact, vacuum should be understood as a space where gas is thin. In a given space, the state of the gas below one atmospheric pressure is collectively referred to as vacuum. The degree of gas thinness in a vacuum state is called a degree of vacuum, and is usually expressed by a pressure value. Therefore, the vacuum packaging is not actually completely vacuum, and the vacuum in the food container packaged by the vacuum packaging technique is usually 600-1333 Pa. Therefore, the vacuum packaging  is also referred to as a vacuum packaging or an exhaust packaging.

Vacuum packaging technology originated in the 1940s. In 1950, polyester and polyethylene plastic films were successfully used for vacuum packaging, and vacuum packaging was rapidly developed.

China's vacuum packaging technology was developed in the early 1980s, and vacuum inflatable packaging technology began to be used in small quantities in the early 1990s. With the promotion of small packaging and the development of supermarkets, its scope of application is more and more extensive. Some will gradually replace hard packaging, and the prospects are very promising.

It was the first development period from the 1950s to the mid-1980s, which began with the manufacture of simple air extractors. At that time, there were less than 20 enterprises producing vacuum equipment in the country, and the products were mainly obtained in medium and low-grade vacuum, such as the mirror coating machine cigarette packaging machine. From the late 1980s to the 1990s, it was the second period of China's vacuum industry development. During this period, the number of production enterprises increased to nearly 3,000, and the number of employees reached 35,000. After the technical transformation of the “seventh five-year” and “eight-five” technology, the overall level of the vacuum industry has been greatly improved. From the processing conditions, advanced production equipment such as CNC machine tools and resin sand castings of machining centers began to be equipped with enterprises. By 1996, due to the pull of the magnesium smelting industry, the vacuum industry has developed rapidly.

Application Example Of Mortar Spraying Machine

The mortar spraying machine is much faster than the original manual brushing and roller coating. The choice is because the paint directly passes through the spray gun to the surface of the object to be painted, and does not need to be continuously brushed to the painter. It is more uniform. Moreover, the film thickness can be achieved at one time, which reduces the number of construction passes.

Because different models of high-pressure airless spraying machine have different pressure ratios and flow locations, plus the selection of various specifications of nozzles, they can be adapted to various types of coatings with different viscosities, so high-pressure airless spraying machine have a wide application , ships, machinery and equipment, boilers, automobiles, bridges, road signs and furniture are all automatically sprayed with an assembly line.

The so-called automatic coating line is the automatic blasting of steel plates or sections. After removing the oxide scale and rust layer on the steel surface, in order to prevent the steel plate from rusting again, pre-coat a layer of steel plate pretreatment workshop. The old formation and exclusion.

There are three types of mortar spraying machine lines: horizontal, vertical, and inclined spraying. Usually, the most horizontal spraying type is used. This type is composed of a high-pressure airless spraying machine, an automatic spray gun, a double chain of a moving gun motor, an air pipe moving by the spray gun, and a steel plate transmission line. The movement of the automatic spray gun is driven by a chain or a cylinder. When the steel plate is transported on the raceway, it is sprayed once by walking a certain distance (one spray width) by counting method. The time for spraying paint mist is controlled by the proximity switch, that is, when the nozzle leaves the steel plate, the stroke switch sends a signal to make the spray gun cut off the air source and immediately stop spraying.

The reciprocating motion of the spray gun is driven by a chain. Pin in movable chute. Fenzhou Ripple is fixed. The gun moves to the right when the pin is on the top and to the left when it is on the side.

The spray strokes of different steel plate widths are different, which means that the automatic spray gun sprays back and forth, and has a repainting width of 1/2. The smaller width steel plate is protected by the limit switch. When the automatic spray gun reaches the edge of the steel plate, the travel switch signal cuts off the air supply to the spray gun and immediately stops the spray. The automatic spray gun still moves forward. When approaching the steel plate back, the spray gun was opened and bite-coated. This is the case with two automatic spray guns.

Bucket Rock Loader