2019 – Page 51 – CNC Machining & Turning, Milling, Metal parts

The working principle of the bubble vegetable cleaning machine

Vegetable cleaning is one of the essential processes in vegetable processing and vegetable production. At present, vegetable cleaning relies mainly on manual processing, and its mechanization procedure is very low. The existing vegetable washing machines have two types: vibration spray type and drum type. There are two cleaning pools in the vibratory spray vegetable cleaning machine. The vegetables are used in the vibratory cleaning pool for repeated movement, and the initial cleaning is carried out. Then the shower pool is sprinkled with clean water to complete the whole cleaning process.
The washing machine has large water consumption and has great damage to leafy vegetables. The main body of the drum type cleaning machine is a tilted metal mesh cylindrical revolving body. The center axis of the cylinder is equipped with a number of spray pipes of the nozzle. The vegetables are scoured by the jet flow at the same time as the cylinder rotates, so as to achieve the purpose of cleaning. The washing machine can only finish the cleaning of root vegetables such as potatoes and potatoes, and the damage to vegetables is large when it is washed. It can not be applied to the cleaning of leafy vegetables. Therefore, a new vegetable washing machine with ultrasonic and bubble as vegetable cleaning power was designed. Experiments show that the cleaning machine can effectively remove the contaminants on the surface of vegetables, and has little damage to vegetables.

In liquid containing many bubbles, the instantaneous pressure will be generated when the bubble collapses and springback is regenerated. When the collapsing bubbles are near the solid boundary of the over current, the high pressure and repeated action produced by the ceaselessly collapsing bubbles in the flow can destroy the surface of the solid, thus producing cavitation. The bubble ruptures near the vegetable surface, and the nearly spherical bubbles move along the jet to the rigid solid surface. As the submerged jet forms a thin layer of flow on the surface of the solid, the lateral flow of liquid flow between the surface of the bubble and the vegetable surface makes the liquid pressure of the bubble wall near the vegetable surface (called the near wall) at the far end (called the far wall), and the velocity of the centripetal movement is slower than that of the other parts. At the center of the bubble moving to the vegetable surface, the distance between the near wall and the vegetable surface is basically the same. In order to maintain the conservation of momentum (without considering the effect of liquid viscosity), the bubbles must be accelerated, the far wall is inward inward, near the near wall, and the near wall is penetrated to form a very high velocity microjet. This micro jet points to the surface of the vegetable. Bad and erosion ability is very strong.

Through calculation and measurement, it is found that when the wandering bubble collapses, the velocity of the micro jet near the solid wall can reach 70~180MPa. Such high dynamic pressure can completely remove the contaminants on the vegetable surface and shorten the cleaning time. Moreover, this is only the pressure of a micro jet on the surface of the vegetable. When the bubbles in the water continue to produce, increase, and disintegrate, the impact pressure of the bubble collapse continuously acts on the vegetable surface, effectively removing the contaminants on the vegetable surface.

How to maintain the laser marking machine

When we use laser marking equipment, to make the equipment stable and live longer, that is how you maintain and maintain, surpassing the laser editor to give you some suggestions:
1. There should be no other debris on the equipment. The surface of the equipment should be kept clean.
Two. Production operators should strictly operate according to the standard operating procedures and strictly prohibit arbitrary operation.
Three, the equipment circuit must be reliably grounded to protect personal safety.
Four, the laser marking machine should regularly replace distilled water or deionized water. When changing the water, clean the water tank carefully.
Five, keep the equipment clean, strictly prohibit the use of wet cloth scrubbing equipment, strictly prohibit live cleaning equipment.
Six, equipment startup and shutdown should strictly follow the opening and closing procedures, and strictly prohibit arbitrary operation.
Seven. It is strictly prohibited to start the laser power supply and adjust the Q power supply when the water or water circulation is abnormal.
Eight, should regularly scan the computer disk and disk defragmentation, often clean up junk files.
Nine, all PLT format files should be fixed and not allowed to move randomly to prevent file corruption.
Ten, computer crash or software no response, should immediately turn off the mirror switch.
Eleven, check the quality and quantity of cooling water regularly, keep the internal circulating water clean, regularly clean the water tank and replace clean deionized water or pure water.
Twelve, strictly prohibit cell phones, strong magnetic objects near the device mirror.
Thirteen, it is strictly prohibited to open the galvanometer when the marking software is not opened.
Fourteen. Prohibit the use of hands or other objects to contact lenses
Fifteen. Strictly prohibit private mobile devices
Sixteen. There is no abnormal sound in the operation of the equipment
Seventeen. Is the equipment damaged or missing
Eighteen, in case of a sudden power outage, please press the red button immediately and pull the switch to the closed or stop position one by one, or adjust the laser power current to the lowest position.
Nineteen, when the equipment is abnormal, it should stop and report in time.
Twenty, the equipment should make relevant equipment maintenance and inspection records, and record all the contents of inspection and maintenance.
Twenty-one. The contents of maintenance and inspection include:
1. daily examination content:
1) the equipment is clean and lubricated.
2) there are no sundries on and around the equipment
3) the current of the equipment is not easy to exceed 20A
4) whether the mobile phone or the strong magnetic object is close to the vibrating mirror
5) there is no abnormal sound in the operation of the equipment
6) no contact with the lens or other objects
7) equipment must be turned on and shut down strictly.
8) computer crash or software no response, immediately turn off the mirror switch.
2. the contents of regular inspection;
1) good grounding of equipment circuit
2) check the water quality and water of the cooling water
3) the use of electrical appliances and circuits
4) equipment cleaning
5) there is no abnormal sound in the movable property of the equipment
6) is there any damaged or missing component
7) the operation of the refrigerator

Airtight requirements for UHV electric pum

For the hydraulic system of UHV electric pump, it is very strict on the airtight property, which directly affects the daily use efficiency and the service life of the electric pump. In general, we have to realize its closed performance through the following forms.
The first is to use sealed gaskets, which are divided into metal and non metal. Unlike other ordinary metals we see, it is relatively extensibility. The material is mainly copper, iron, aluminum, and non metal materials are mainly asbestos and rubber. The principle of its airtight is mainly an elastic deformation. When the sealing gasket is placed in the middle of a hydraulic element that needs to be closed, when the two components are squeezed by some external force and pressure on the seal, the seal will change shape due to some of its own characteristics. It is a variant expansion, which effectively prevents the generation of gaps between the two components.
Compared with the first closed mode, for the EHV Electric Pumping Station, the second kinds of sealing methods are more common, that is, dynamic seals. Dynamic seal is a kind of closed mode between the components of relative motion. Because of the different hydraulic components of any kind of hydraulic pump, there will be more or less crevice due to relative motion, and the dynamic seal is the sealing way mainly for these crevice. Because the relative motion between the components of the ultra high voltage electric pumping station is very complex, the seal mode of the dynamic seal is also varied. The common seal is used in a lot of rubber seals. This seal is called the expansion ring seal. In addition, the forming packing seal and the stuffing seal formula are often used in the dynamic seal of the hydraulic components.
The third seal, called self tight seal, also called automatic seal, is very ingenious. The dynamic seal is closed to the gap produced by the relative motion between the components, and the self tight airtight is the effect of using the relative motion of the ultra high voltage electric station element to realize the closed effect. This way of sealing can be understood as the gap between some elements can be reduced by clever movement, or even completely closed.

The difference between hinges and hinges

Hinge is a small part hidden between doors, fans and frames in door and fan installation, but it is the most important connector for opening and closing doors and fans. So when we buy hinges, we need to know more about related knowledge, so that we can extend the service life of doors and fans. Xiong Hushan Xiaobian below to introduce the difference between hinge and hinge to understand it.
Hinges and hinges are two different hardware parts. A tool, such as a hinge that is connected between a door and a wall, that refers to an active part and a fixed part. Hinges can be used for connection between fixed objects and moving objects, and are often used for connection between moving objects. The hinge is loose relative to the live page. Keep one side of the page and move on one side.
In the opening process of the window, the hinge is fully connected with the function of the hinges. In many cases, the hinge is often called hinges, but the hinge window fan is only rotated, while the hinged window fan is both rotating and moving. In many cases, hinges and hinges can be replaced by each other, but some special cases have to be used, such as windows, which usually use hinges.
The difference two, the hinge is mainly installed in the door and window, and the hinge is more installed in the cabinet: according to the material classification, it is divided mainly into the stainless steel hinges and the iron hinges, in order to make people get better enjoyment and hydraulic hinges. It is characterized by a certain buffer and the maximum reduction of noise.
Difference three, when the hinge is used on the window, because it does not provide a hinge like friction itself, it is often combined with another push to avoid the wind blowing the window back and damaging when the window opens; and the hinge is different, and its own installation of the hindrance, so it can be used alone and used in flat opening. The hinge on the top of the window is slightly different, and the length of the outer arm is different from that of the window frame.

Torque wrench

Torque wrench is also called torque wrench, the torque is the product of force and distance, while fastening screw bolt nut and other thread fasteners need to control the size of the torque applied to ensure that the thread is fastened and does not cause the excessive torques to destroy the thread, so the torque wrench is operated. First set an upper limit of the required torque value, when the torque is set to set value, the wrench will issue a “Carta” sound or the wrench connection bend a point angle, which means that it is tightened and does not add force again. Torque wrench can be divided into: preset torsion wrench, digital torque wrench, MINI torque wrench, fixed torque wrench, dial torque wrench.
1 torque wrench (torque wrench) – also called torque wrench or torque wrench or torque wrench, torque is the product of force and distance, when fastening screws and nuts and other thread fasteners need to control the size of the torque applied to ensure that the thread is fastened and does not break the thread because of excessive torque, so the torque wrench is operated. . First set an upper limit of the required torque value, when the torque is set to set value, the wrench will issue a “Carta” sound or the wrench connection bend a point angle, which means that it is tightened and does not add force again.

The effect of the real estate industry on the price of steel pipe in 2019

he capacity supply of the steel pipe industry in 2019 will still be affected by environmental policy, the production of crude steel in the warm season or a substantial decrease in the same period. The high prices of steel pipe (3756, -53.00, -1.39%) are expected to inhibit the low stock of the traders’ hoarding, which will have a strong support for the price of steel pipe in the spring of next year. Sentiment, the price of steel pipe in the 1-4 month or more innovation. In the next year, the increment of EAF and the task of removing capacity are partly hedged. The output of crude steel is expected to fall flat or small in 2017. The rate of demand growth in the lower reaches is down, and the absolute amount is still expected to increase slightly. But considering the two quarter steel production pressure and the demand for seasonal downward pressure after May, the price of steel pipe in 5-10 may continue downward.
The first quarter is the traditional off season of iron ore supply. It is necessary to pay attention to the concrete time of the double production of the steel plant and the strength of the iron ore supplement. Since the downstream demand will be gradually warmer in March, once the price of steel pipe is opened up, the price of the steel plant supplement or the driving of iron ore will go up substantially, and the price of steel pipe will continue to fall after May, then the price of steel pipe will continue to decline after May. The price of mine will also follow the fall, considering the iron ore supply season in the second half of the year, and the new production capacity of overseas mines has been put into operation in the second half of the year. If the steel plant is in advance to stock the iron ore before the November heating season, the pressure of the fall of the iron ore price will increase clearly in the three quarter.
2, 2018 steel pipe futures strategy: 1, screw steel 1805 contract depth of water, the current thread of the discount rate has reflected the market arbitrage in March next year, the northern steel plant reproduction expectations and demand for the pessimistic view of the demand. Next spring, we need to pay attention to the pace of demand recovery. We recommend that we grasp the 1805 contract to repair the premium. 2, next year, under the high profit stimulation, 3-10 month full load production probability is larger, the supply is expected to exceed demand in May, while considering the iron ore supply season in the second half of the year, it is suggested that the machine should be short for the 1810 contract of the screw steel and the 1810 contract of iron ore. 3, at present, the actual production profit of the screw thread is 1400-1700 yuan / ton, and the profit of the rebar 1805 contract is about 1050 yuan / ton, which can be considered as the 1805 profit of the multi thread steel. 4, the current thread steel futures show the pattern of far month discount, when the potential downside of the real estate can not be falsified, when the 10-5 price difference or the 1-10 price difference shrinking hours can grasp the opportunity.
3, risk point: the impact of new restrictions on policy or economic stimulus; the implementation of capacity tasks, real estate regulation and environmental protection; the real estate market has fallen beyond expectation, and the demand of machinery and automobile industries has fallen beyond the expected risk.
After the first half of the year, the investment in electric furnace steel has become a hot spot in the market. In the whole 2017, the domestic large electric furnace manufacturing plants are very full and are in short supply. By the end of November 2017, 96 enterprises wishing to convert the intermediate frequency furnace to the electric arc furnace were going to install 145 electric furnaces, of which 48 were being built and 50 have been put into operation. It is estimated that the output of domestic electric furnaces will increase by more than 30 million tons in 2017, and the output of new electric furnaces will increase further next year. In July, Chi Jingdong, vice president of China Steel Association, explained the policy of changing the arc furnace of medium frequency furnace, indicating that the current medium frequency furnace changing arc furnace will not relax, and it is expected that the reduction replacement will still be strictly carried out in 2018 to limit the net increase in capacity.
The continued implementation of government led capacity tasks, the added capacity release of the superposition EAF may be delayed, expected to increase the effective capacity of crude steel in 2018 or a small increase, but the output of 2018 will be slightly lower in 2018 than in 2017. On time, it is expected that steel supply will remain tight in 1-4 months next year, and is expected to ease in May. The reason is: 1, the northern heating season limited production, November 15th -3 month 15 “2+26” City steel plant will be limited to 50%; 2, the medium frequency furnace reduction replacement, electric arc furnace renewal capacity, is in shutdown construction period, this part of the capacity will be released gradually in the 3-5 month of next year, in the first quarter of this part of the production capacity is not In 3 and 2018, the capacity task is 25 million tons, of which the productive capacity is 25 million tons, of which the effective capacity is 50%. According to the political task in the past year, the capacity task will be overdone in the first three quarter or even in the first half of the year, so the capacity of the one or two quarter is limited, which leads to the tight supply of steel pipes. .

The downstream steel is mainly to real estate, infrastructure, engineering machinery, automobile, shipbuilding, household appliances and other links, the largest proportion of steel consumption is real estate, accounting for about 38% of the total amount of steel, so the real estate market has played a vital role in the demand of steel pipe.
In 1-11 months of 2017, the total sales area increased by 7.9% over the same period last year, down 16.4% from the same period last year. Since the start of the new round of regulation in October 2016, sales growth has continued downward. General housing sales are ahead of the new construction for 6 months, so the slowdown in sales growth has begun to affect the growth of new housing starts. In 1-11 months, the new housing area has increased by 6.9% over the same period, 0.7% down from the same period last year, and the decline is limited, but it can be foreseen that the growth rate of new housing construction area will decline further next year. The increase in land purchase area and the big rise in land prices in first and second tier cities were affected by a large increase in land prices in first and second line cities. In 1-11 months, the total amount of real estate investment increased by 7.5% year-on-year, up 1% from the same period last year. As housing sales growth continued to fall, development loans were tightened,

How to install the dark sockets

First, the first step needs to make the bottom box ready: the function of the bottom box is to connect the electric wire circuit, the socket panel and the switch, and also to connect the lamps and lanterns. In the market, there are two kinds of darkbottom boxes: 86*86*25mm square boxes and 100*100*50mm open wall bottom boxes.

Two, dark fitting socket installation method: first from the socket box to draw out the wire, from the wooden platform or the plastic table out of the line hole out, then the plastic table or wood table tightly fitted on the wall, locking the screws on the box or wood brick, if the thread, the hidden line on the wooden platform can move toward the right hand side to the wire position. Fix it with screws. When the plastic table or wooden platform is fixed at this time, the line, the neutral line and the protective earth line can be put out in the hole of the switch and the socket according to their respective positions, and the wires are locked firmly according to the wiring requirements. Stick the switch or socket on the plastic table or wooden platform, fix the center and fix it with wooden screws. Finally, the switch and socket cover board. The dark socket is done.

Where is the advantage of the cold heading fastener

The cold heading process is a kind of plastic deformation produced by metal under external force, and the metal volume is redistributed and transferred by means of mould, so as to form the required parts or blank processing method. The cold heading process is most suitable for producing standard fasteners such as bolts, screws, nuts, rivets and pins. What are the advantages of the following cold heading process?

(1) cold heading is carried out at normal temperature. Cold heading can improve the mechanical properties of metal parts. No matter what kind of bolts, the tensile strength after cold heading is better than that of cutting. This is because the metal fibers of the cold heading product will not be cut off, the internal structure of the metal is compacted, and the working hardening is accompanied by the existence of the working hardening phenomenon, so the mechanical properties of the metal are improved.
(2) the cold heading technology can improve the material utilization. For example, the cold heading six corner bolts, except for the loss of the material head, have achieved no machining at all, for example, the utilization rate of cutting materials is very low. The material utilization ratio of the cold heading nut is also much higher than that of the cutting nut.
(3) the cold heading technology can greatly improve the productivity. If the cold heading nut is compared with the cutting nut technology, the productivity will be increased by several times.
(4) reduce the cost of the enterprise. The use of the cold heading machine has realized the simultaneous processing of each process on a machine tool, reducing the production site occupied by the equipment, thus greatly reducing the production cost of the enterprise.
(5) reduce the labor intensity of personnel. The production of the cold heading machine reduces a lot of process links, does not need the transportation of the half product in each process, especially reduces the labor intensity of the workers, and improves the working conditions.
(6) cold heading process can improve product surface finish and ensure product accuracy. For large quantities of bolts, nuts and so on, it can guarantee its accuracy.
(7) the general performance is good. There are many models for producing cold heading bolts and nut forming machines. Moreover, the equipment has reliable performance, high efficiency and stable product quality, and can produce all kinds of standard parts and customized non-standard parts.

Because of the above advantages, cold heading technology is more and more widely used in mechanical manufacturing, especially in the production of standard fasteners. Bobun Petrochemical is the domestic large and high end metal processing oil research and development base. It is committed to the development and application of the new type of metal cold forming oil. The self developed cold heading oil series products are suitable for cold heading technology, such as copper aluminum, carbon steel, stainless steel and titanium alloy, which can be effectively reduced. The wear of the low impact bar and die has greatly improved the accuracy of the process. It has been fully recognized and praised by customers in practical application.

What are the advantages of diamond small saw blades produced by hot pressing technology

Diamond saws are hot pressed, cutting sharpness 15%-25%, widely used for various stone processing, we have various specifications and models of the saw, welcome to inquire.
The common technology of diamond saws is sintering and welding. With the increasing demand of small saw blades, more and more sintering processes are used, and the sintering has cold pressing and hot pressing.
The characteristics of the hot pressing saw are as follows:
1. less heat loss, easy temperature control, and guarantee the quality fluctuation of the whole furnace saw blade is small.
2. the application of heat-resistant stainless steel mold, good shape, the appearance of the product has greatly impr

Reamer supplier discusses common problems and solutions of tool deep hole machining

e former reamer supplier star long has introduced some common problems and solutions to the deep hole processing of the cutting tools.
First, there is a problem: the reamer’s service life is low.
1. The causes are: the reamer material is not suitable, the cutting fluid is not suitable, the cutting fluid is not flowing smoothly, and the surface roughness of the cutting and hinged cutting edges is too high.
2, the solution: the hard alloy reamer or coating reamer can be used to select the reamer material according to the processing material; the cutting fluid is regularly selected according to the processing material; the chips in the chip groove are often cleared, and the cutting fluid with sufficient pressure is used to meet the requirements through fine grinding or grinding.
Two. There is a problem: the shank of the reamer is broken.
1. The reason is: the reamer hole allowance is too large; when the reaming hole is reamed, the allowance distribution and the choice of the cutting amount are not suitable; the space of the reamer blade is small and the chip is blocked.
2, the solution: modifying the size of the pre processing aperture, modifying the allowance distribution, selecting the cutting amount reasonably, reducing the number of reamer teeth, increasing the space of the capacity of the chip, or grinding the gap between the cutter teeth.
Three, there is a problem: the position of the articulated hole is very poor.
1. Causes: wear of guide sleeve; too far end of guide sleeve from workpiece; short length of guide sleeve, poor accuracy and loose spindle bearing.
2, the solution: replace the guide sleeve regularly; lengthen the guide sleeve to improve the coordination precision of the clearance between the guide sleeve and the reamer; repair the machine tool and adjust the clearance of the spindle bearing in time.

Four. There is a problem: the cutting edge of the reamer.
1, the causes are: too large reamer hole allowance; high hardness of the workpiece material; the cutting edge is too large and the cutting load is not uniform; the main angle of the reamer is too small to increase the cutting width; when the hinges or the blind holes are reamed, the chip is too much, and it is not cleared in time and sharpened when the blade is sharpened.
2, the solution: modify the size of the pre processing diameter; reduce the material hardness or use the negative front angle reamer or hard alloy reamer; control the swing difference within the qualified range; increase the main deflection angle; pay attention to remove the chip in time or take the blade with the blade inclination angle; pay attention to the quality of the grinding.
Five, there is a problem: after reaming, the center line of the hole is not straight.
1. The causes are: the borehole deviation before the hinges, especially the smaller aperture, can not correct the original bending degree due to the poor rigidity of the reamer; the reamer’s main deflection angle is too large; the guide is bad, the reamer is easily deviated from the direction in the reaming; the cutting part is overlarge; the reamer is displaced at the gap in the intermittent hole; when hand hinges hole, in hand hinges hole, The force is too large in one direction, forcing the reamer to deflect to one end, which destroys the verticality of reaming.
2, the solution: increase the correction hole in the hole reaming or boring process; reduce the main deflection angle; adjust the appropriate reamer; change the reamer with the guiding or lengthening parts; pay attention to the correct operation.