Screen straightener monopoly
if the delay off time and relay time are adjusted too short, they should be set at 0.2 ~ 0.4 seconds
the strength of the steel bar to be cut is too high. The steel bar that has been cut before can be cut again on the machine to distinguish that the strength of the steel bar to be cut is greater than 750N
At present, the methods of mineral recognition and mapping are characteristic band recognition and recognition based on similarity measure: ① using the characteristic band structure recognition technology of rock and mineral, this method is relatively intuitive, simple and feasible, but a single feature often leads to the wrong recognition of rock and mineral, and its accuracy is difficult to meet the needs of engineering application The accuracy of spectral reconstruction is high; ② Starting from the overall characteristics of rock and mineral spectrum, matching, fitting or decomposing the apparent reflectance data of imaging spectrum are also the focus of current research, which can effectively avoid the mismatch of single spectral feature caused by spectral drift or spectral variation of rock and mineral, and can comprehensively utilize the weak spectral information, It can avoid the confusion caused by local features (such as the recognition method based on single feature), and the recognition accuracy is high
for hundreds of bands of imaging spectrum, the amount of data is very large, especially at present, whether it is aviation imaging spectrum data, such as AVIRIS, CASI, hymap, etc., or in orbit space imaging spectrum data, such as Hyperion, the flight band is generally narrow, generally in 3-10km, which brings a lot of inconvenience to large-area application and increases the difficulty of large-area data processing, The workload is doubled under the current microcomputer configuration. Therefore, it is necessary to explore a new technological process to carry out the identification of minerals, whether from the local characteristics or the overall characteristics of rock and mineral spectrum, and to carry out the engineering processing under the condition of ensuring the identification accuracy
in the comparative study of imaging spectral data characteristics and recognition methods, combined with the actual work and the preliminary requirements of engineering processing, under the condition of ensuring the recognition accuracy, the technical process of standard database spectrum + spectrum feature domain conversion + mineral recognition method is designed. The main functions of this process are as follows:
(1) directly carry out the identification and information extraction of altered minerals: Based on the comprehensive study of rock types, structures, hydrothermal activities and minerals in the experimental area, extract altered minerals closely related to mineralization, and use the spectra of standard library or field measured spectra as reference spectra
(2) transform the spectral domain and feature domain to rece the dimension and compress the data, rece the workload and improve the work efficiency: the imaging spectral data band is more than 100, and the single processing data volume can reach 1gbytes with different flight band width and recording length, and the single flight band of intermediate transition file can reach 10gbytes; In the previous processing, the flight band is often divided into smaller areas for processing and then stitching. Using MNF technology, the whole spectral domain space can be converted to the feature domain space, eliminating the correlation between the components of the original spectral vector, so as to remove the vector with less information and higher noise, and make the data processing from hundreds of spectral domain to the denoised feature domain, Rece the amount of data, shorten the data processing time, improve the efficiency of data processing
(3) feature separation can increase the separability of different minerals and improve the accuracy of mineral recognition: in the feature domain space of MNF transformation and noise band elimination of imaging spectral data, different bands are given different physical or mathematical meanings, the spectral features of ground objects are separated in the feature domain, and the fine features of ground objects are amplified, which increases the separability of data
4.4.2.1 spectral feature domain conversion
the improvement of spectral resolution, on the one hand, improves the accuracy and application ability of data classification and recognition, on the other hand, increases the capacity of data, and also makes the data highly rendant and highly correlated. Effective data compression and feature extraction is imperative. In general, a series of image spectral data compression and feature extraction methods are derived by using the corresponding changes of traditional principal component transform, such as MNF transform (Kruse, 1996; Green et al., 1998), napc (Lee et al., 1990), block principal component transform (Jia et al., 1998) and principal component based correspondence analysis (CARR et al., 1999). Spatial autocorrelation feature extraction (Warner et al., 1997), subspace projection (Harsanyi et al., 1994) and second-order feature analysis of high-dimensional data (Lee et al., 1993; Haertel et al., 1999). The use of non-linear wavelet and fractal features (Qiu et al., 1999) is also under study
Principal component analysis (PCA) is to determine the transformation matrix according to the statistical characteristics of the image, and carry out orthogonal linear transformation on the multi-dimensional (multi band) image, so that the new component images after transformation are not correlated with each other, and the useful information in multiple bands is concentrated in a few component images as much as possible (Fig. 4-4-1). Generally, the signal-to-noise ratio decreases with the increase of the order of principal components. However, it does not fully conform to this rule when there are many bandsin order to improve the data processing ability of principal components in hyperspectral dimension, the maximum noise component transform (MNF) method was used (Gan, 2001; P > 0; Gan Fu et al., 2002-2003). The method uses the noise component matrix of the image Σ< sub>N Σ< The feature vectors of sup > - 1 < / sup >) transform the image, so that the noise components of the transform components sorted by the feature values from large to small are graally reced, and the image quality is improved in turn. Σ Is the total covariance matrix of the image, Σ< Sub > n < / sub > is the covariance matrix of image noise. MNF is equivalent to principal component analysis when all band noise variances are equal, so it can be implemented in two steps. The first step is to transform the image to a new coordinate system so that the covariance matrix of the transformed image noise is the unit matrix; In the second step, principal component transform is applied to the transformed image. This improved algorithm is called "noise adjusted principal component transform (napc)"
for P-band hyperspectral images
Z < sub > I < / sub > (x), I = 1, 2,..., P (4-4-1)
it can be assumed that
Z (x) = s (x) + n (x) (4-4-2)
here, Z < sup > T < / sup > (x) = {Z < sub > 1 < / sub > (x),..., Z < sub > P < / sub > (x)}, s (x) and n (x) are independent information components and noise components in Z (x) respectively. Therefore,
cov {Z (x)} = ∑ = ∑ < sub > s < / sub > + ∑ < sub > n < / sub > (4-4-3)
∑ < sub > s < / sub > and ∑ < sub > n < / sub > are covariance matrices of S (x) and n (x) respectively. Therefore, the I-band noise component,
var {n < sub > I < / sub > (x)} / var {Z < sub > I < / sub > (x)}, can be defined 4-4-@4
select linear transformation, MNF transformation can be expressed as
imaging spectral rock and mineral identification method technology research and influence factor analysis
in the transformation, At the same time, in order to separate noise and information, s (x) is orthogonal to Z (x) and n (x) respectively
Fig; The other is to make the image vector, information component and additive noise component perpendicular to each other. Multiplicative noise can be transformed into additive noise by logarithmic transformation. After the transformation, the denoising of each component image can be targeted, or the component with dominant noise can be discarded. The eigenvalue curve of MNF transformation is shown in figure 4-4-1
4.4.2.2 feature separation
in the feature domain after MNF transformation, different bands have different physical and mathematical meanings. For example, the first band after transformation represents the brightness information of the ground object, and the seventh or eighth band represents the terrain information. In MNF transform, by separating the signal from the noise, the information is more concentrated in the limited feature set, and some weak information is enhanced in the denoising transformation. At the same time, in the MNF conversion process, the spectral feature vector set is gathered to enhance the classification information
Fig. 4-4-2 is the curve profile of some mineral spectra before and after MNF transformation. From the right figure, it can be seen that the information and noise are orderly concentrated in some limited bands. By abandoning the noise band or other processing, the influence of noise can be reced or eliminated accordingly. At the same time, information is easier to distinguish than the original data
4.4.2.3 mineral identification
the method of spectral similarity measurement is mainly used for mineral identification. Based on the similarity probability of the whole spectrum shape feature, the mismatching of single spectrum feature caused by spectral drift or spectral variation of rocks and minerals can be effectively avoided, and the weak spectral information can be comprehensively utilized
Fig. 4-4-2 feature comparison of mineral spectrum before and after MNF transformation. Using the reconstructed spectral data after atmospheric correction, we can selectively use the above mineral recognition techniques to identify the end member minerals. The spectral angle method can directly select endmember minerals for matching, and finally generate binary image, which is simple and easy to operate, and can obtain high recognition accuracy on the premise of reasonable and reliable threshold
spectral angle technique is one of the better methods in the identification and extraction of rock and mineral geological information by imaging spectrum (Wang Zhigang, 1993; Liu Qingsheng, 1999). The method of spectral angle recognition is based on the multi-dimensional spectral vector space, which is composed of spectra θ The similarity measure between the reference spectral endmember vector (R) and the image pixel spectral vector (T) is solved, that is:
imaging spectral rock and mineral identification technology research and influence factor analysis
< P > here, ‖ * ‖ is the molus of the spectral vector. The reference endmember spectrum can come from laboratory, field measurement or image pixel spectrum of known categories. θ Between 0 and π/ The smaller the value is, the higher the similarity is, and the more reliable the information is. Through reasonable threshold selection, the binary image of mineralization and alteration information can be obtained4.4.2.4 the selection of threshold value and the connection of information between flight bands
there is the segmentation of non mineral information in spectral angle technology, spectral matching and mixed spectral decomposition, so the selection of threshold value is an important problem that must be faced. This is not only related to the reliability of the identified minerals, but also related to the size of mineral distribution. At the same time, e to the influence of atmospheric correction error and noise, the spectral characteristics of the same ground object are different among different bands, which may make the spatial distribution characteristics of minerals extracted in all the diagnosis and consistency between the bands, and increase the difficulty of mapping. Therefore, the following principles should be followed in the selection of threshold: the overall consistency and the transition of navigation zone should be considered while removing obvious false information and retaining reliable mineralization alteration information
4.4.2.5 technical process
combined with imaging spectral data preprocessing, according to the actual application, the technical process of imaging spectral remote sensing geological survey can be summarized, as shown in Figure 443
how to solve the problem of poor drainage of washing machine
there are many fault factors causing poor drainage or non drainage
first of all, it is necessary to confirm whether the drain pipe is down and whether the water outlet is too high. After eliminating these two possibilities, the common causes and troubleshooting methods are as follows: open the rear cover plate, check whether the drain valve tension strap falls off, whether the valve tension strap or the drain pull rod is broken, whether the drain spring has lost its elasticity and is loose, and whether the drain valve tension strap is too loose, Take corresponding measures to solve the problem. Then check whether the drain filter and drain valve in the barrel are blocked by debris, causing slow or even no drainage. At this time, remove the drain filter for cleaning, flush the drain outlet with water and remove debris in the drain valve. If the drainage pipe is twisted and compressed in the box, it will also cause drainage obstacles. The drainage pipe can be rearranged. If it is seriously deformed e to excessive distortion, the drainage pipe should be replaced. After long-term use, the sealing ring of the dewatering bucket will cause water seepage and leakage e to aging and wear. Because the dehydration motor is under the sealing ring, once the water leakage, it will directly flow into the motor, causing damage to the motor
the repair process of the leakage of the sealing ring of the dewatering bucket is as follows: first, loosen the screw connecting the flange shaft of the dewatering bucket and the brake wheel, take out the dewatering bucket, then remove the V-belt, loosen the drain valve belt, so as to disconnect the base, and gently pry off the sealing ring with a "screwdriver" (pay attention not to damage the bucket body). If the sealing ring of the dewatering bucket is not available at the moment, the old parts can be cleaned, the sealing spring ring can be removed, the sealing spring ring can be disassembled and cut short for 3-4 circles, and then the sealing spring ring can be installed. This method can only be used for a short time, and it is better to replace the new sealing ring, apply adhesive on the outer edge of the sealing ring, and then install the bucket body. It should be noted that one is loaded from the bottom of the barrel and the other is loaded from the top. Then add water to check for water leakage. After checking, it can be used. With the improvement of people's living standards, some consumers are not satisfied with the washing method of semi-automatic washing machine and choose full-automatic washing machine instead. The feature of the automatic washing machine is that it realizes the washing process through the degree controller, so it saves time and effort. When purchasing this kind of washing machine, in addition to the appearance selection, it is mainly to check and select the internal function quality of machinery and electrical appliances. The steps are as follows: (1) connect the power supply, turn the pointer of the program controller clockwise to the degree of washing or rinsing, start (pull out) the power shape of the program controller, and you should hear the water inlet solenoid valve work to make a light "buzz". If you touch the water inlet connector by hand, you should feel the vibration, which indicates that the water inlet solenoid valve is in good condition 2) If there is no sound or vibration feeling, turn off (press down) the program controller, turn the drainage degree clockwise, and then start the program controller. You can hear the big "bang bang" sound of the drainage solenoid valve, which indicates that the power output channel and the solenoid valve of the washing machine are in good condition; If the drain solenoid valve does not reflect, it indicates that the water inlet solenoid valve is stuck 3) When the above two actions can not hear the working condition of the drainage solenoid valve, it must be that the power input channel or the programmable controller switch has no contact fault
(4) connect the water and power supply, set the pointer of the water and controller to the washing or rinsing level, set the water level selector at the low water level, start the program controller, and the tap water should flow into the barrel. When the water level in the barrel is up to 20 cm, the pulley should rotate and the water inlet valve should be closed to cut off water; This shows that the motor water level selector function is perfect. After starting the program controller, the water can't flow into the barrel, but the wave wheel moves. This is the "dry cleaning" fault in the waterless state, which is mainly caused by the improper adjustment of the water level selector 5) When the above proceres are normal, when the program controller automatically runs the drainage procere, the wave wheel shall stop rotating, and the drainage solenoid valve shall open the drainage. If the solenoid valve does not open the drain, it indicates that the solenoid valve has mechanical structure fault. It may be that the connecting rod is broken or the connecting pin is disconnected 6) When the program controller runs to the rinsing level, the drain valve should be closed, and a big "bang" sound can be heard. At this time, the inlet valve begins to feed water, and the above level is repeated again. If the drain valve can not be closed, the bucket can not store water, mainly because the drain valve can not be reset, the normal degree of washing machine will be interrupted. In a word, as long as the washing machine can realize the cycle of water inlet washing water closing drainage and water storage water inlet, it is a fully automatic washing machine with good quality. When the automatic washing machine does not drain, check whether the drain pipe is down, whether the drain pipe is twisted or blocked? If there is such a phenomenon, it should be ruled out. Then select the washing machine program to the single dehydration program and start it. Listen to whether the drainage electromagnet has a "pa" sound. If there is a closing sound, it indicates that the closing of the drain electromagnet is normal, and the drain valve may be blocked; Drain valve pull
1. Mineral processing: it is a process of separating useful minerals from gangue minerals by means of various mineral processing equipment based on the differences of physical or chemical properties of minerals, and achieving relative enrichment of useful minerals< Gravity beneficiation: it is a method to achieve separation according to the movement speed and trajectory of minerals with different densities in the medium
3. Flotation beneficiation: it is a method of mineral separation in flotation machine by adding appropriate reagents according to the different wettability of mineral surface
4. Magnetic separation: it is a method of separation in a magnetic separator according to the different magnetic properties of minerals
5. Taste: refers to the ratio of the weight of metal or valuable components in the proct to the total weight of the proct
6. Yield: the ratio of proct weight to raw ore weight
7. Beneficiation ratio: the ratio of raw ore weight to concentrate weight
8. Rich ore ratio: the ratio of the percentage of useful component content in concentrate to that in raw ore
9. Recovery: the percentage of the weight ratio of the metal in the concentrate to that in the raw ore
10. Free settlement: when the pulp concentration is low, the direct interference between the surrounding ore particles and the wall is negligible except for the medium resistance, which is called free settlement
11. Interference settlement: when the slurry concentration increases, the particles are directly rubbed and collided by the surrounding particles, and the interference from the medium they pass through increases. Moreover, the higher the concentration is, the greater the mechanical resistance is, and the stronger the interference effect is. At this time, the settlement is called interference settlement
12. Separation particle size: screen or analyze the graded procts, and take the extremely narrow particle size with 50% distribution ratio in grit and overflow as the boundary size
13. Graded grain size: the grain size of the standard mineral whose settling velocity is equal to the ascending water velocity represents the boundary grain size
14. Classification efficiency: the accuracy of hydraulic classification process can be expressed by classification efficiency
15. Grading quality efficiency:
16. Grading quantity efficiency: the grading efficiency calculated by the recovery rate of fine grade in overflow only reflects the variation relationship of quantity in the grading process, expressed by e quantity
17. Jigging cycle: the rapid movement of water completes a cycle, which is called a jigging cycle
18. Shaker beneficiation: according to the density of minerals, the characteristics of stratification in the transverse jigging flow along the inclined plane, and the vertical shaking and bed surface
19. Heavy medium beneficiation: a beneficiation method in which the mineral particles are separated according to the density in the liquid or suspension with relative density greater than 1
20. Contact angle: at the boundary point between the solid surface contacted by the liquid and the gas, make a tangent line along the surface of the droplet or bubble, then the angle between the tangent line and the solid surface on the liquid side is called the contact angle
21. Bubble mineralization: a process in which bubbles graally adhere to ore particles
22. Hydrophobic minerals: minerals that are not easily wetted by water
23. Hydrophilic minerals: minerals easily wetted by water
24. Magnetization roasting: it is a process of converting weak magnetic iron ore into strong magnetic iron ore under certain conditions at high temperature
25. Trickling furnace: the phenomenon that the roasted ore is automatically discharged out of the furnace without the control of the discharge roller is called trickling furnace< Smelting furnace: the temperature of the ore heated in the furnace is too high, exceeding its softening point to form a molten state, or the local temperature is too high, resulting in ore
27. Specific magnetization coefficient: according to the magnetic moment of the unit mass object magnetized in the external magnetic field of the unit magnetic field intensity, that is, the magnetic coefficient of the object.
2< br />1． The beneficiation process consists of pre beneficiation (ore preparation operation), (beneficiation operation) and post beneficiation (dewatering operation)< br />2． The technological indexes of mineral processing include (grade), (proct rate), (beneficiation ratio), (rich ore ratio) and (recovery rate)< br />3． Gravity beneficiation is based on the (density) (particle size) of various minerals, which is related to the (particle shape) of minerals to a certain extent< br />4． The media commonly used in gravity mineral processing are (water), (air), (heavy liquid), (heavy suspension)< br />5． In the classification operation, the medium operation forms are (vertical upward), (nearly horizontal), (rotary movement)< br />6． Hydrocyclone is the most effective (fine) classification equipment at present< br />7． Jigging beneficiation is one of the main methods of gravity beneficiation, which is widely used in the separation of (coarse) materials< br />8． Shaking table beneficiation is one of the most successful and widely used gravity beneficiation methods for separating (fine) ores< br />9． The structure of the head of the shaker is (cam lever shaker), (eccentric connecting rod shaker) and (spring shaker)< br />10． Shaker bed surface mainly has (cloud tin bed surface), (6-s bed surface), (spring bed surface)< br />11． The characteristics of Yunxi coarse sand bed are (three slopes and four levels), Yunxi fine sand bed is (one slope and two levels), and Yunxi groove bed is (one slope and two levels). 6-s bed surface characteristics (uneven). The characteristics of spring bed surface are (different density)< br />12． The supporting mechanism of shaking table has four ways: sliding support, rolling support, rocking support and elastic support. 6-s uses rocking support< br />13． The properties of heavy suspension include density, viscosity and stability< br />14． Gravity beneficiation process includes (ore washing), (desliming), (grinding), (classification), (separation) and other beneficiation operations< br />15． The flotation system includes solid phase, gas phase and liquid phase< br />16． The relationship between lattice type and floatability of minerals (molecular lattice) & gt Metal lattice) & gt Covalent lattice) & gt Ionic lattice)< br />17． The reasons of potential difference between solid and liquid surfaces in flotation system are preferential dissociation, preferential adsorption and lattice substitution< br />18． The commonly used collectors of sulfide minerals are xanthate, black agent, sulfur nitrogen, sulfur nitrogen grease and other grease< br />19． The commonly used foaming agents are (pine oil and terpineol oil) (cresol acid) (heavy pyridine) (alcohol foaming agent), etc.
20 Commonly used inhibitors are cyanide, zinc sulfate, argon sulfuric acid, dichromate, sodium sulfide and low combination inhibitors< br />21． The functions of sodium sulfide in flotation are (activation), (inhibition) and (drug removal)< br />22． Commonly used pH regulators are (lime), (sodium carbonate), (caustic soda), (sulfuric acid)< br />23． The commonly used collectors for oxidized minerals are (carboxylic acids) (hydroxy acids) (amines and ether amines) (hydrocarbons)< br />24． Carboxylic acid collectors include (animal and plant fatty acids), (tall oil), (petroleum fraction oxidation soap) and (petroleum fermentation fatty acids)< br />25． The flotation methods of iron ore include (positive flotation with anionic collector), (reverse flotation with anionic collector), (reverse flotation with cationic collector) and (selective flocculation flotation)< br />26． According to the different useful components, copper related ores can be divided into the following categories: single copper ore, copper sulfide ore, copper pyrite ore, copper molybdenum ore, copper nickel ore and copper cobalt ore< br />27． The basic condition of magnetic separation is (the magnetic force of magnetic particles) & gt The resultant force of the mechanical force in the opposite direction of the magnetic force on the magnetic particle< br />28． According to the size of magnetism, minerals can be divided into (strong magnetic minerals), (medium magnetic minerals), (weak magnetic minerals) and (non-magnetic minerals)< br />29． The important types of iron deposits in China are Anshan type, Xuanlong type, Daye type, Damiao type, Bayan Obo type and Jingtieshan type< br />30． Sampling objects can be divided into static materials and moving materials. Different sampling methods should be used for different sampling objects< br />31． The sampling methods of massive material pile include (scooping method) and (exploratory well method)< br />32． There are four proceres for sample processing: screening, crushing, mixing and shrinking< br />33． There are three methods of sample mixing (moving cone method), (ring cone method) and rolling method)< br />34． The common methods of sample rection are (quartering method), (multi slot sampler method) and (grid method)< br />35． Weakly magnetic iron ores mainly include hematite, limonite, siderite and Specularite, which are collectively referred to as hematite< br />36． Commonly used gravity mineral processing equipment (hydraulic classification), (jigging mineral processing), (chute mineral processing), (shaker mineral processing), (heavy medium mineral processing), etc< br />37． Commonly used magnetic separation equipment (permanent magnetic drum magnetic separator), (magnetic dewatering tank), (magnetic agglomeration gravity separator), (magnetic separation column), etc< br />38． The magnetization roasting equipment includes Anshan type shaft furnace, rotary furnace, slope type roasting furnace and boiling roasting furnace< br />39． The flotation processes of copper sulfur ore include (preferential flotation), (mixed separation flotation) and (semi preferential mixed separation flotation)< br />40． The separation principle of copper sulfur mixed concentrate is (floating copper and restraining sulfur), that is, restraining (Pyrite)< br />41． The relative density of mineral can be determined by drying method or concentration pot method< br />42． In the gravity separation process, the principle of early recovery and more recovery should be implemented for concentrate, and the principle of early loss should be implemented for tailings< br />43． The characteristics of iron ore in China are (poor), (Miscellaneous) and (fine)< br />44． Low intensity magnetic separation equipment adopts (open) magnetic system, and high intensity magnetic separation equipment adopts (closed) magnetic system< br />45． According to the solubility proct of ethylxanthate, the common metals can be divided into three categories. The metals with smaller solubility proct include (gold), (silver), (mercury), (copper), (lead), (cadmium), (bismuth), the metals with medium solubility proct include (zinc), (iron), (manganese), and the metals with larger solubility proct include (calcium), (magnesium), (barium)< 3. Answer the questions
1. What is the difference between hydraulic classification and screening
A: in proction practice, the feeding of hydraulic classification is composed of particle size groups with different particle size, density and shape. The settling velocity of ore particles is not only related to particle size, but also to density, shape and settling conditions. Therefore, the classification procts are different from the screening procts, which are not uniform particles, but isostatic particles with the same settling velocity, that is, the particles with higher relative density are smaller, and the particles with lower relative density are larger
screening is mostly used to deal with materials larger than 2-3mm. As the proctivity and screening efficiency of fine materials are very low, the screen is not easy to manufacture, and the strength of the screen surface is not enough, hydraulic classification is often used for materials less than 2-3mm
2. What are the factors that affect the performance of hydrocyclone
A: the inner diameter of the hydrocyclone; Size and shape of feed mouth; Overflow pipe diameter and insertion depth; Diameter of desilting mouth; Column height; The cone angle of hydrocyclone; Feed pressure; The particle size composition of the feed; Feed concentration
3. What are the commonly used jigging cycle curves
A: asymmetric jigging cycle curve with high rising water speed and long action time; The results show that the rising water velocity is greater than the falling water velocity and the action time is equal; The results show that the jigging cycle curve is characterized by high rising water velocity, short action time, low falling water velocity and long action time; Complex vibration jig cycle
Villa for many people's definition is the place where the rich live, but in fact, villa is a kind of building different from commercial housing. Villa is an independent building. What is an independent building? Independent buildings are independent buildings. Generally speaking, villas and ordinary commercial housing communities are different villas. Generally speaking, they live in a certain person or a certain family, which is a kind of building house with an indivial or a family as a unit. Villas generally have courtyards. Let's learn about the manufacturer's recommendation of villa courtyard fence
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1. Shengcheng screen Co., Ltd. was founded in November 1990. After years of market training, Shengcheng screen has become one of the largest screen processing and manufacturing enterprises in China and one of the top ten brands in China's screen instry. Since its establishment for more than 20 years, Shengcheng screen has been adhering to the concept of professionalism, integrity, innovation and service, and has always been in a state of steady and rapid development. Today, Shengcheng screen has developed into a large-scale enterprise with nearly 1000 employees and businesses in nearly 170 cities around the world. Shengcheng screen has the world's advanced cold drawing and cold rolling equipment, the world's first-class sheet mesh welding machine and the automatic coating proction line designed according to the European and American coating standards; At the same time, Shengcheng screen adopts zero distance manufacturing process with the world instry level, which fundamentally ensures the stable and reliable proct manufacturing quality; In the manufacturing process, from the selection of raw materials, transportation control and manufacturing standards, strive for perfection. Perfect ISO9001:2000 standard quality management system, effectively control every detail of the proct. The requirements of Shengcheng screen for its own quality exceed the European standard
2. Hangzhou yuanmiao Instrial Co., Ltd is a guardrail manufacturer integrating proction and sales. The company's main procts are PVC plastic steel fence (including PVC lawn fence, PVC fence fence, PVC transformer fence, etc.), zinc steel fence (including zinc steel lawn fence, zinc steel road fence, zinc steel fence fence, zinc steel balcony fence), wire mesh (including bilateral wire mesh, frame net, court fence, workshop isolation net), waveform fence and noise barrier, etc. The company has a complete and scientific quality management system. The integrity, strength and proct quality of Hangzhou yuanmiao Instrial Co., Ltd. have been recognized by the instry
3. Anping chuangrong wire mesh Manufacturing Co., Ltd., Anping County chuangrong wire mesh Manufacturing Co., Ltd., Anping County, Hebei Province, was founded in 1994. After more than 20 years of joint efforts of the whole body chuangrong people and many times of large-scale equipment introction and renewal, Anping chuangrong wire mesh Manufacturing Co., Ltd, R & D and technical personnel absorption, training, has developed into a set of R & D, manufacturing, sales, wire drawing. Weave a net. A comprehensive large-scale proction enterprise with one-stop deep processing; As a powerful barbecue net and screen deep processing R & D and manufacturing enterprise in China, it has 6 R & D personnel, 28 technical personnel, 110 professional excellent employees, 2 after-sales tracking service personnel, 2 sets of wire drawing equipment proction lines, 2 sets of automatic mesh welding machines, 8 sets of embossing mesh weaving machines, 30 sets of spot welding machines, 10 sets of pneumatic row welding machines and plate shears. Bending machine, straightening machine, trimming machine, circling machine, argon arc welding, punching machine and other equipment
the above manufacturers are specialized in making villa courtyard fence. If you want to make a difficult friend in your own villa courtyard, you can refer to the above manufacturers. Most villas need to clean the courtyard fence. The main function of courtyard fence is to improve the security of villas. Villa is an independent building, so the safety of the villa must be paid attention to, otherwise it is easy to be invaded by some thieves. Villa courtyard fence is best to choose some iron, iron villa courtyard fence will be more solid, anti-theft will be better