Henan Shuangzhi machinery as henan scraping machine accessories manufacturers, especially scraping machine accessories business is quite perfect, product variety, a relatively complete, the host has zhangjiakou manufacturer, shandong, shanxi coal, mining machine, the bull run of huainan longwall, linzhou heavy industry, etc., product categories such as scraping board, e type bolt, u bolt, beams, the sprocket shaft group, dumbbell pin, card block, guard board, dial the stopper, coupling and brake disk connected sets, central trough, chain tensioner, even pick up board, lap board, elastic plate, rack, rack pin, passes, headstock, tail carriage and so on. Scratcher accessories we Henan Shuangzhi do is relatively complete, but also to meet the needs of market customers Scratcher accessories, because of focus, so the quality is guaranteed. Henan scraping machine accessories manufacturers double of henan machinery in order to develop and market needs, product business is expanding, hydraulic support accessories, crusher accessories, move the tail accessories also have involved, as manufacturing, technology and equipment is our bottom spirit and strength, the customer need, we can do, support to sample processing, drawing processing, cooperative diversity, just to give customers a better service!
Large conveyance: Conveyance of bulk materials in a closed case; cement, chemical, and food industries Flow Conveyor Chain moves bulk materials in a closed case. It conveys the particles horizontally, on a slight incline, or vertically in an arrangement shaped like the letter L. This conveyor is sometimes called a Redler Conveyor. Generally, a flow conveyor is used widely in the conveyance of bulk materials such as cement and fertilizer in chemical industries, and grain in food industries. Because it is enclosed, dust from the conveyed materials is contained, and will not pollute the surrounding area. A flow conveyor is not usually used to move sticky, dusty, or low-density products. A flow conveyor set up to move cement has an average capacity of 300 ton/h and a speed of 35 m/min. Usually one strand of chain is used. Specially shaped attachments with large clearances are installed on small pitch or large pitch conveyor chains. The chain operates in a casing filled with conveyed material, such as grain, flour, or ash. This is based on a phenomenon used in a basic science experiment; when you put sand in a long cylinder, closed at one end with paper, and push the sand with all your strength, the paper cannot be broken if the cylinder is long enough. This is because the friction between the sand and the cylinder absorbs all of the pushing force. Conversely, in the flow conveyor, the attachments work as moving walls, and the sand moves along with it. To lift conveyed objects, the friction at the bottom wall of the conveyor must support the weight of the vertical portion, therefore, the conveyor must have a bottom line "L" shape. Because there is very little relative movement among the conveyed materials in this application, breakage is rare. The case width is determined by the attachment dimensions; usually it is less than 750 mm. Chains for flow conveyors include: RF03075 (average tensile strength, 29 kN) through RF26200 (314 kN) for grain conveyance; RF450W (108 kN) through RF36300N (868 kN) for other applications.
Know Us Leveraging on our robust infrastructure and expertise of dexterous workforce, we, IndoChains, are a name to reckon with. Established in the year 1981, we have been successfully catering to the needs of bulk material handling, material conveying, storage, reclaiming & stacking, surface finishing, peening and casting.
Belt width (800mm,1200mm and 1400mm) Composition: Weight per meter (800mm= rubber 9.8kg and steel cord 4.2kg, estimated total length 2,645m) (1200mm= rubber 26.4kg and Steel cord 6.8kg, estimated total length 17,486m) (1400mm= rubber 36.6kg and steel cord 8.2kg, estimated total length 8,381m)
The gear track of the scraper is installed on the gear track seat of the middle slot, which is the track supported and guided by the shearer. It is an important support point for the stability of normal coal mining for the shearer to realize the haulage of the shearer relying on the tooth and rail pin tooth of the scraper. Therefore, scraper conveyor parts manufacturers remind you to use a more durable scraper conveyor gear track. At present, the teeth and rails of the plate scraper in the market mostly adopt the structural forms such as integral die forging, integral casting, split welding and forging welding. Fission welding type rack and forge welding type rack is a compound structure, by putting the two track plate and pin gear processing compound into an organic whole, due to welding and machining accuracy cannot be guaranteed, so prone to open the phenomenon such as welding, fracture, wear, these two kinds of structure of the rack can't meet the need of the high-power coal winning machine supporting the fully mechanized coal face. Although the whole cast gear track avoids the problem of gear track cracking to some extent, the casting strength obviously fails to meet the use requirements, which affects the coal mining efficiency. The integral die forging gear track is strengthened by heat treatment of alloy structural steel. It adopts die forging technology and completes the manufacturing process by a series of procedures such as forging, forming, trimming and punching. Therefore, the overall strength of the tooth and rail of the scraper is higher than the above three technologies, the pin tooth position and tooth shape processing accuracy is more guaranteed, can make the shearer and the tooth and rail better mesh, the impact force in the use process is also smaller, for the large power shearer, conveyor supporting use to provide a guarantee. The integral die forged gear rail can meet the required performance requirements and is more durable. After reading, you choose and buy which scraper gear rail heart roughly spectrum! Henan Shuangzhi produces various types of gear rail forgings, scraper forgings, sprocket components, etc. If you want to know more, you are welcome to contact us in time.
The E bolt is suitable for the scraper conveyer of the fully mechanized mining, and it is the common fittings of the equipment of the fully mechanized mining. The E bolt is used to fix the scraper on the chain (forming the chain of the scraper), and the chain of the scraper bypasses the sprocket for the stepless closed cycle operation to complete the coal transportation. The common material of Type E bolt is 40CR, which can also be determined according to customer's requirement. Common Types of E-bolts: 3TY-48, 3TY-02, 3TY-06, 113S011208-2, 54SA14-3, 121S03/01-4, 15GL-2, 2S06-2B, 4GL-1, 1GL3-2, 15GL01-2, 134S011609-2, 90S012107-2, etc. Specifications of Screw thread of E-bolts: Using M24 studs or M30 studs, some manufacturers will produce some custom bolts, using different studs, there are M22, M26 and other non-standard bolts. The studs of the same standard are slightly different, such as type E bolts of 90S, which are divided into M24*2 filaments and M24*3 coarse filaments. Type E bolts of scraper accessories belong to vulnerable parts, so most commonly used bolts are in stock, from material to processing technology to meet customer requirements. Need scraper, bolt, dumbbell pin and other easy to wear parts, welcome to inquire.
The middle trough of the scraper conveyor is one of the key parts of the scraper conveyor, and it is the fuselage of the scraper conveyor. Only the volume and quality of the scraper conveyor occupies about 70% of the scraper conveyor machine. Scraper parts manufacturer Henan shuangzhi below for you to introduce the scraper middle trough. As an important spare part of the scraper conveyor, the middle trough of the scraper is not only the bearing mechanism of the material and the scraper chain, but also the important fulcrum of the hydraulic support. Each scraper is generally equipped with more than 100 middle slots, the length of the middle slot is mainly 1.5m and 1.75m two types. Therefore, the service life of the scraper and the transport volume are largely determined by the service life of the middle slot. The middle slot is mainly made of the groove side and the middle plate. The material is mainly 16Mn and ZG30SiMn2 of high manganese steel. According to the different manufacturing technology of the middle slot, the middle slot can be divided into welding middle slot, casting middle slot and integral casting middle slot. According to the different structure of the central trough, the central trough can be divided into the open bottom middle trough and the back end middle trough. The middle groove can be divided into the middle groove of the single and the middle groove of the double. The central trough of the scraper is in direct contact with the material, coal gangue and scraper chain, which is easy to be affected by it and will cause scraping and wear for a long time. The middle plate, bottom plate and groove top of the middle slot are the most prone to wear. The main wear forms are abrasive wear, fatigue wear, adhesive wear and corrosion wear. Henan Shuangzhi, as a highly praised scraper conveyor accessories manufacturer in the industry, improves the abrasion resistance of the central slot of the scraper by adopting wear-resistant materials and optimizing the surface strengthening technology of the central slot. About more coal machine accessories product information, please continue to pay attention. If you need coal machine parts, you are welcome to telephone consultation, shuangzhi service for you anytime and anywhere.
Scraper speed reducer is mainly composed of upper box, lower box, one axis assembly, two axis assembly, three axis assembly, four axis assembly, bearing, gear, seals and so on. At present, the different parts of the scraper reducer are mainly lubricate by grease, oil immersion and splash. The main lubricants of plate scraper reducer are no. 150 extreme pressure gear oil or No. 22 hyperbolic gear oil and No. 2 sodium base grease. The bearings and gears on the second, third and fourth shafts of the scraper reducer are lubricated by splashing oil. Scraper reducer in the oil, follow the strict and accurate principle, can not be mixed with different grades of lubricating oil. Lubricating oil shall be loaded from the top viewing hole when the scraper reducer is being lubricated, and the amount of lubricating oil shall be kept at one third of the circle arc bevel gear. After the new reducer is put into use for 200 hours, the oil inside the reducer should be released, cleaned and changed. After the initial cleaning and oil change, wash and oil change every 1000 hours. When the reducer is working, it should be cleaned and changed for oil when the following conditions occur visually. Oil appears to deposit dirt, particulate sediments. The oil darkens, turns black, and even gives off an unpleasant smell. Brown gelatinous material appears on parts of reducer, corrosion marks appear on the surface of parts. Oil body flow difficulty. There are some situations need to be tested, in the reducer lubricating oil sundry content more than 2%, metal abrasive more than 0.5%, water content more than 2%, the need to clean oil change. In strict accordance with the requirements of the timely scraper reducer lubrication, cleaning and oil change can prolong the cycle of the reducer. Henan Shuangzhi Machinery Equipment Co., LTD. Production reducer, axle assembly, two axle assembly, three axle assembly, four axle assembly, arc bevel gear, if there is a need, you can telephone consultation, Shuangzhi machinery is looking forward to working with you.
The middle trough of the scraper machine is also called the slop or trough is the fuselage of the scraper conveyer, which is composed of the middle plate and the groove side steel, etc. The upper trough to transport coal and the lower trough for the scraper chain to be fixed with bolts in the return journey. Double small series to take you to understand the scraper conveyor under the middle trough. Scraper conveyer transport coal and other goods of the main carrier, the middle trough according to the production process to divide, can be divided into the welding middle trough and the casting middle trough. The welding middle groove is mainly composed of groove top steel and middle plate. There are two types of groove top steel, one is M-shaped groove top steel and the other is E-shaped groove top steel. As the name implies, these two types of groove top steel are shaped like capital letters M and E. The central trough of the scraper is mainly used as a channel for transporting coal. Usually a section of the middle groove is composed of two 1.5 meters long groove steel and two middle plates. After the two middle plates are welded to the groove steel, the upper and lower layers are formed, in which the scraper chain runs. The state has clear standards for the steel used to weld the groove top steel of the middle slot, while the middle plate is selected in accordance with the actual application, with ordinary 45 steel, 16 manganese, or other materials, and in order to increase the wear resistance, you can add welding wear strip above. Through the above description, have a basic understanding of the central slot of the scraper, Henan Shuangzhi production chute, scraper and other easy to wear parts, sprocket components new and repaired, structural parts. Welcome new and old customers to consult the factory.
Sprocket wheel is an important component of sprocket assembly. Sprocket assembly is composed of sprocket wheel, sprocket shaft, bearing, bearing housing, sealing ring, etc. Sprocket material is made of 42CrMo, and its mechanical and other aspects of performance are better than other materials. Sprocket wheel of sprocket assembly is mainly produced by forging and quenching process to improve sprocket wear resistance, of course, there are other processing equipment finishing. The processing requirements of sprocket assembly sprocket wheel shall first ensure that the surface of sprocket wheel forgings of sprocket assembly is free from cracks, interlayers, folds, forgings, slag inclusion, crust and other defects, and check to ensure that there is no crack in the middle of the sprocket body. Secondly, the tempering hardness of the sprocket wheel of the sprocket assembly reaches HRC250-280, and the tooth surface is quenched. The quenching hardness of the tooth surface of the sprocket is HRC50-55, and the hardening layer depth is 10mm, so as to improve its wear resistance and extend the service life of the sprocket assembly. Through to the sprocket chain wheel body component processing, can also see that double of henan for scraping machine sprocket components such as all kinds of machine parts production strictly, made of high quality products, customer satisfaction products, has been a double the execution of the standard, we use good products, in exchange for your trust, if you need a scraper conveyor sprocket, welcome to contact us, double of henan look forward to cooperation with you!
S003-0102 sprocket assembly plays an extremely important role in the whole scraper conveyer. Its performance directly affects the production efficiency, product quality and service life of the scraper conveyer. S003-0102 sprocket assembly is mainly composed of bearing cover, bearing housing, roller, sprocket, shaft, floating seal, roller bearing and so on. Power output by the reducer, through the sprocket shaft to the sprocket spline, so that the sprocket drive scraper operation. The s003-0102 sprocket assembly is lubricated by thin oil, sealed by mechanical float, and lubricated by long distance. The s003-0102 sprocket assembly can be disassembled as a whole for easy maintenance without disassembling the transmission. 7S003-0102 sprocket components in the installation and use of daily maintenance, take preventive measures in advance, to extend the service life. If you need sprocket assembly, you are welcome to contact us in time.
The guard plate, also called tongue plate, is suitable for the scraper conveyer, which is located in the head part of the scraper conveyer and belongs to easy wear parts. It is used with the chain splitter. The use of the guard plate facilitates the disassembly of the chain splitter, shorens the maintenance time of the scraper conveyer and improves the utilization rate of the equipment. According to the scraper model plate can be divided into: 630, 730, 800, 830, 880, 900, 1000, 1200 and so on. According to the different use position of the guard plate can be divided into: head guard plate, tail guard plate. According to the supporting main engine plant is divided into: Zhangjiakou coal machine, Shandong mining machine, Shanxi coal machine factory, Northwest Run cattle, Zheng coal machine and so on. According to the type of use can be divided into: scraper tongue plate assembly, transfer machine tongue plate assembly. Installation method of guard plate: the two ends of the plate are fixed with a chain dipper which is symmetrical and perpendicular to the tongue plate, and the chain dipper bolts are arranged symmetrically in the middle of the two chain dippers, and the outer side of the chain dipper is respectively provided with two fork sleeves which can be attached to the upper limit of the pin shaft on the head shell of the conveyor. If you need coal mine conveyor guard plate, you are welcome to contact us in time.
Scraper bolts can be divided into scraper E-bolts and U-bolts, and single bolts, and 134Se bolts is one of the many e-bolts scraper. Today I will take 134Se bolt as an example and talk about the processing technology of E bolt. The processing method of type 134Se bolts is almost the same as that of the scraper. The general process is blanking â?? forging â?? machining â?? heat treatment â?? shot blasting â?? surface treatment â?? finished product inspection â?? packaging and delivery. 134Se type bolts are actually the choice of material when discharging. 40Cr material is used for 134Se type bolts of Henan Shuangzhi Machinery. Its mechanical properties and other aspects are relatively good, which is suitable for the production environment of coal mine. The raw material is melted at high temperature and injected into the 134Se bolt mould. Through continuous forging and pressing of the raw material, the blank of 134Se bolt is formed. The forging and pressing times shall not be less than 5 times. For the 134Se type bolt blanks, the excess flanges of The E type bolts were removed and threaded tapping was carried out. The oxide scale formed on the surface due to high temperature was further treated by shot blasting. Next is the treatment of the surface appearance, burr the 134Se type bolts and other treatment, as well as the appearance of painting, so that the E type bolts on the completion of the molding, and then the finished product inspection, to ensure that the qualified products can leave the factory, to carry out baling packaging shipment. Henan Shuanzhi produces all kinds of bolts. Welcome to contact us if you need.
Sprocket components and scraper chain as the important transmission configuration of scraper conveyor, if there is a fault, it may affect the normal operation of underground coal mining work. So how do you deal with such situations? The sprocket components sometimes has the phenomenon of high temperature in the operation process, the cause may be the insufficient lubricating oil, or the damage of bearing and sprocket may cause the aggravation of friction, which makes the temperature rise. Then the solution is to oil the sprocket assembly, so that the amount of oil to the specified requirements, or replace the worn bearing, sprocket body to make a new replacement. The scraper chain has the condition of jumping teeth at the sprocket assembly, which is caused by many factors, such as too loose scraper chain, twisted chain segment, unequal length or elongation of double-strand chain or different number of rings, as well as the influence of excessive scraper deformation. The correct treatment method is to adjust it: re-tensioning the scraper chain, re-install the twisted chain segment correctly, check the scraper chain length and elongation if unqualified, it should be adjusted and replaced, and must use the odd ring chain, and is to replace the seriously deformed scraper. Inspect the daily maintenance of sprocket assembly and chain of scraper conveyer according to different conditions, deal with and solve the faults in time, reduce the influence of associated problems. Henan Shuangzhi production scraper transfer machine parts, crusher and reducer parts, etc. Welcome new and old customers to visit the factory.
The beam is also called the press plate.The material of the beam is 40Cr.There are two main production processes of beam,forging and casting.After forging,the beam has better strength , toughness and mechanical property. Function: The beam is used to press the chain on the scraper,which is fixed by bolts and is a part of the link chain. The working position of the beam of the coal mine scraper conveyor is located in the middle part of the scraper conveyor. The chain and the scraper are fixed together to form the scraper chain by cooperating with the single-head bolt. Therefore, the function of the beam of the coal mine scraper conveyor is the same as that of the E-bolt and U-bolt. The scraper chain is placed in the central trough of the scraper conveyor, and is driven by the sprocket assembly and other driving departments to transport coal operations. More coal mine scraper conveyor beam and other coal machine parts information, information, welcome to consult Henan Shuangzhi machinery understanding. If you have any purchase requirement in terms of beams, please feel free to contact us.
Different host manufacturer production of scraper conveyor types are different, their agency is also different, so the use of scraper is also different, to host manufacturers scraper type can be divided into zhangjiakou scraper, running of the bulls, scraper, scraper, shandong mining machine for shanxi coal scraper, linzhou heavy scraper, huainan longwall scraper, gansu and scraper, etc., can be seen on the market some other manufacturers of scraper, but the basic it is modeled after the major makers to turn, or simply change the figure number. The type of scraper is divided by the host manufacturer is a general direction, and then subdivided according to the size of the host can be divided into: 630 scraper, 730 scraper, 764 scraper, 800 scraper, 830, 880 scraper, 900 scraper, 960 scraper, 1000 scraper, 1200 scraper, 1250 scraper, 1350 scraper and so on. The type of scraper can also be divided through processing technology, is also known as the two kinds, that is forging scraper, casting scraper. From the performance of the forging scraper is better than the casting scraper, of course, the advantage of the casting scraper is its cost is lower than the forging scraper, customers can choose the appropriate scraper according to their own and coal mine needs. Scraper type division can help you to carry out the scraper, through a range of narrow find correct scraper, right, of course, to a simple or scraper scraper confirmation drawing no., there are specific scraper figure, often can be quickly what kind is the implementation of the scraper, except, of course, not the original factory scraper drawing no., it may need to slowly checked by classification and size. If you need to scraper conveyor scraper, you are welcome to timely contact us.
The hydraulic chain tensioner has the following advantages: (1) The braking mode is reasonable and reliable. In the large scraper conveyor, the excessive torque can not be braking through the brake disc, and the hydraulic motor tight chain system internal braking function braking, the way is more reasonable, more reliable. (2) Low fastening speed is conducive to control. The hydraulic motor tightens the chain, the motor speed is 100 RPM, after the reducer, the drive sprocket speed is lower, the chain speed is lower, more conducive to control. (3) Simple operation, more conducive to control. Compared with the brake disc chain tightening device, the scraper conveyor hydraulic motor chain tightening system only needs to pull the operation handle or press the operation button, and the hydraulic system can complete the chain tightening. (4) High safety factor. Hydraulic motor chain fastener has the advantage of hydraulic system, compared with the brake disc chain fastener of mechanical brake, overload unloading and transmission torque is more stable, high safety. Scraper conveyer hydraulic motor tight chain system progress day by day, together with the coal mine fully mechanized working face automation degree more and more high, will become the future coal machine configuration mainstream. Henan Shuanzhi production of various types of hydraulic chain, brake disc chain, about more scraper accessories, you are welcome to telephone consultation.
The dumbbell pin plays an important role in the normal operation of the scraper conveyer as the connecting member between two adjacent chutes. Today the coal machine parts manufacturer Henan shuanzhi will introduce the dumbbell pin of scraper conveyer for you. Scraper conveyor dumbbell pin shape is like "fitness dumbbell", the middle is thinner, thicker at both ends. The dumbbell pin jams the ends of the two adjacent middle slots by the thicker ends at each end and connects the two adjacent middle slots by the thin middle rod. In addition to the common dumbbell pins described above, there are two types of special shaped dumbbell pins - I-type dumbbell pins and day-type rings. The stress condition of dumbbell pin is more complicated. In the process of hydraulic support moving the middle trough, the dumbbell pin will be pulled by the adjacent middle trough and subjected to shear stress because the adjacent chute is not synchronized. The dumbbell pin of scraper conveyor is a vulnerable part, and the common fault is fracture. The first crack occurred in the neck of the dumbbell pin, mainly because the neck of the dumbbell pin is a region where stress concentration is relatively large. Under long-term working conditions, the dumbbell pin's neck crack growth area diffused to a certain extent, resulting in fatigue fracture, resulting in the fracture of the whole dumbbell pin. Once the dumbbell pin is broken, it will cause the middle slot dislocation or off, the scraper chain is affected by it, easy to break the chain, the chain clip, from the chute off the phenomenon, affecting the scraper conveyor working surface production safety and normal production. Above is the dumbbell pin on the scraper conveyer, do you know? The dumbbell pin of the scraper conveyer produced by Henan Shuangzhi is forged from the selected material of 40Cr, and the quality is comparable to that of the original products after multiple processes such as tempering and quenching. More scraper parts, transfer machine parts, hydraulic bracket parts related product models, product information, you are welcome to consult.
Compared with the casting process, the forging process of 17GL7-1 scraper conveyer can make the hardness, strength and service life of the scraper more in line with the service requirements. But the forging process of 17GL7-1 scraper is difficult to be controlled in the actual production process. The following coal manufacturers double zhi machine will give you the introduction of 17GL7-1 scraper forging process of the three points. 1. Heat the scraping slab The main purpose of heating 17GL7-1 scraper blank is to increase its hardness, toughness and service life. When 17GL7-1 scraping slab is heated and tempered, the oxide layer on the surface of the slab is constantly knocked out to ensure the hardness and toughness of the product, and meanwhile, the smoothness and flatness of the surface of 17GL7-1 scraping slab is also ensured. In the process of shaping the billet, the temperature should be lowered to about 1100 degrees Celsius to achieve a good shaping effect and increase the plasticity of the scraper. 2. Control of quenching temperature After being heated and tempered, the 17GL7-1 scraper needs to be put into water to be quenched, so that the hardness and strength of the 17GL7-1 scraper are strong. Quenching temperature control is the key and difficult point in the forging process of scraper. Good temperature control can ensure the quality of the scraper and the surface flatness. If the temperature difference is too big, it will lead to the surface of the scraper crack. In quenching, the need to choose the appropriate quenching temperature according to different scraper material. When quenching, field tests should be carried out to control the hardness value. After the scraping plate quenching, but also for the scraping plate residual temperature treatment. 3. Impact energy of a forging hammer China's scraper conveyor production started late, the initial use of the type of die forging hammer is relatively small, the hardness and quality of the die forging hammer is greatly limited, the impact energy of the die forging hammer is far unable to reach the production of the strike energy required by the scraper. The hydraulic force is then used to increase the impact energy of the hammer. The impact quality of the die forging hammer meets the requirements of the scraper manufacturing, the production of 17GL7-1 scraper quality, hardness can be qualified. The above is the key and difficult points of 17GL7-1 scraper forging process. Henan Shuangzhi Machinery Equipment Co., Ltd. based on the coal machine industry for many years, mature technology, diversified equipment, the production of coal machine parts forging strength, high hardness, strong toughness, well received by customers, if you have coal machine parts procurement needs, you are welcome to inquire, to visit the factory.
Scraper E bolt is a kind of fastener used in coal mine scraper and transfer machine, in addition, there are scraper U bolt, single bolt. Squeezer E bolt manufacturer Henan Shuangzhi machinery since the establishment of the factory has been engaged in the production and processing of squeezer accessories, and squeezer, bolts are often sold products, is also a large demand of coal mining accessories. As a scraper E-bolt manufacturer, Henan Shuangzhi Machinery produces various types of scraper E-bolt. Compared with Zhangjiakou bolts and Running ox bolts, it also has some parts of Shanxi coal machine bolts and Shandong mining machine bolts. According to the size of the main engine more than 630 E bolt have to do, so say the type specification or more complete. Daily demand for coal mine is more the e type bolt, scraping machine e bolt manufacturers double of henan mechanical simple display for everyone: 3 ty - 06 bolt, 3 ty - 02, 90 s and 113 s bolt, 17 g bolt, sa 54, 134 s bolt, etc., for the market often need to bolt, scraper part we will inventory spot, in order to reduce the delivery cycle, shall implement the principle of the first to set the start, we welcome the advisory order!
