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common problem

What to do if the screws are aging and corroding?

Screws, zinc coatings during transportation often appear white, black, black and other phenomena, mainly due to galvanization and corrosion of corrosive media and atmospheric moisture, oxygen and carbon dioxide.
In order to prevent this phenomenon, you can try to use a good material before the screw is processed. Due to the galvanizing process, the surface of the defective screw is easily penetrated by corrosive media such as acid, alkali and salt, which is difficult to clean and cause corrosion.
To the reasonable choice of packaging materials, to avoid the use of plastic products that are not compatible with zinc, packaging materials such as galvanized iron sheet metal is the best, can be placed in a box with a suitable amount of desiccant to reduce relative humidity and reduce compatibility and reduce harmful gases Treasury erosion.
In order to prevent the anti-corrosion treatment of non-standard screws, it is already degreased, and the Nasdaq derusting and antirust agent water tank rustproof screw nut swims freely, or the zinc and chromium compounds are used to form a protective film on the metal surface, forming a spray method, Drying, cooling, and then repeating the process once, the obtained thickness of about 5 to 8 μ, silver gray, based on the information provided by the manufacturer of the display, is said to have good rust and corrosion resistance.
Phosphate treatment is a chemical treatment of phosphate containing metal to metal surface to form a phosphate protective film. Phosphating treatment solution is insoluble in water and has excellent adhesion of phosphate film as its main purpose. Bottom layer and coating Cold-adsorbed lubricant metal layer. Since the phosphate coating is composed of a series of different sizes of zinc, manganese, hydrogen phosphate and iron phosphate crystals, the film is porous, has a large specific surface area, has good absorption, an adsorbed coating or a large amount of lubricant Therefore, it is often used as a primer, or cold stamping to reduce friction and lubricating layer of steel, cold drawn wire.
The oxidized steel parts will be immersed in an alkali treatment solution containing an oxidant such as potassium hydroxide or sodium hydroxide solution of nitric acid, and keep its boiling point at about 140 ° C, or nitric acid and sodium hydrogen nitrate impregnate the molten salt of steel It is pleasing to remove the surface layer. The black iron oxide film in the composition having a mixture of ferrous oxide and iron oxide can be obtained after the eyes are quenched in water, which is a method to improve the corrosion of ferrous metals.

What is the difference between screws, bolts and studs? _east

The following is the difference between the three screws, bolts, and studs introduced by Jinming Hardware Grid Xiaobian?

Screws are commonly known as "screws" with external threads

The shape of the nut is usually hexagonal, and the inner hole is an internal thread. It is used to cooperate with the bolt and tighten the related parts.

Nuts are commonly known as "nuts" as standard.

The head of the bolt is generally hexagonal, and the stem is provided with external threads. There are whole silk and half silk, preferably according to the national standard code.

The screws are small, the head has a flat head, a cross head, etc., and the rod has external threads.

The stud should actually be called a "double-headed stud", with external threads at both ends, and generally a polished rod in the middle. The long end of the thread is used to connect to the deep hole, and the short one is connected to the nut.

Screw is a more general term.

The exact words should be bolts, screws, and screw caps.

Bolts and screws are round and long objects, with equally spaced threads engraved on them.

Bolts are flat-cylinder; screws are pointed like nails at the front.

Bolts must be used with screw caps or on objects that have already been threaded.

Screws are used on relatively soft or thin objects, and when used, they are drilled forward with their own threaded side rotation.

The threads on the bolts are shallower without sharp edges; the threads on the screws are sharper and deeper, which is good for drilling into objects.

Most bolts and screws require one of the most common simple tools-a screwdriver.

Fastener surface treatment common sense_Dongguan Jinming Hardware Co., Ltd.

Surface treatment is the process of forming a cover layer on the surface of a workpiece by a certain method, the purpose of which is to give the surface of the product an aesthetic and anti-corrosion effect.

:将接受电镀的部件浸于含有被沉积金属化合物的水溶液中,以电流通过镀液,使电镀金属析出并沉积在部件上。 1. Electroplating : immerse the parts that receive electroplating in the aqueous solution containing the deposited metal compound, and pass the current through the plating solution to precipitate and deposit the electroplated metal on the parts. Generally electroplating includes galvanizing, copper, nickel, chromium, copper-nickel alloys, etc. Sometimes boiled (blue), phosphating, etc. are also included.

:通过将碳钢部件浸没温度约为510℃的溶化锌的镀槽内完成。 2. Hot-dip galvanizing : It is completed by immersing carbon steel parts in a zinc plating bath with a temperature of about 510 ° C. As a result, the iron-zinc alloy on the surface of the steel piece gradually becomes passivated zinc on the outer surface of the product. Hot-dip aluminizing is a similar process.

:通过镀层金属的微粒来冲击产品表面,并将涂层冷焊到产品的表面上。 3. Mechanical plating : The particles of the coated metal are used to impact the surface of the product, and the coating is cold-welded to the surface of the product.

电镀的成本一般每公斤为3——4元, 热浸锌一般为6——7元/公斤,不同的颜色成本都不一样。 Generally, the screws are electroplated, but hot-dip zinc is used for hexagonal wood screws such as electricity and highways . The cost of electroplating is generally 3-4 yuan per kilogram, and hot-dip zinc is generally 6-7 yuan / Kg, different colors cost different.

(Color zinc)

(Black zinc)

(Blue zinc)

What are fiberboard nails? How to distinguish from countersunk head tapping screws_Dongguan

应用中,纤维板钉与自攻钉的都较多地应用在家具领域,但因纤维板钉和沉头自攻螺丝非常的相似,常有人将两者混淆。 In the application of fasteners , fiberboard nails and self-tapping screws are mostly used in the field of furniture, but because fiberboard nails and countersunk head self-tapping screws are very similar, some people often confuse the two. Although fiberboard nails and countersunk head self-tapping screws are both types of self-tapping screws, there are still differences between the two. Let me briefly explain it for everyone!

Fiberboard nails, full name fiberboard screws, are now used instead of wood screws in many cases. Their applications are very wide and their sales in China are very large.


The appearance of fiberboard nails is generally silver, with countersinks, semi-sinks, round heads, etc. The threads are spirally rising in a single line, generally full teeth, with specifications of 3mm, 3.5mm, 4mm, 4.5mm, 5mm, and 6mm. The most commonly used in applications are 4mm, 5mm, 6mm.
Fiberboard nails have a high technical content, and the nails are not easy to crack. The problem of cracks in the staples in some hard wood can also be solved by modifying the thread design of ordinary fiberboard nails to make them claw-cut fiberboard nails. Fiberboard nails are most suitable for wood materials and suitable for power tool installation. At present, they are mainly used in furniture manufacturing, cabinets and other fields.
所生产的纤维板钉无论在质量还是价格方面,都是值得选择的。 The fiberboard nails produced by ingenious fasteners are worth choosing in terms of quality and price.




Countersunk head self-tapping screws. There are many types of heads. Generally countersunk heads and pan heads are more commonly used. The surface treatment is generally galvanized white and the color is slightly dim. There is a drill like a drill at the point. It is applied to wood, but its main purpose is to apply it to thin metal plates, such as the connection between thin iron plates and thin iron plates. The countersunk head tapping screw thread rises in a spiral, but the thread is smaller than the fiberboard nail, and the thread surface has a higher hardness. Therefore, in the thin metal plate connection, the internal thread can be tapped in the threaded bottom hole of the connected member, thereby forming the connection.
Therefore, from the design and application of countersunk head tapping screws, it can be known that self tapping screws such as countersunk head tapping screws are not suitable for use on wood.
1: The thread of self-tapping screws such as countersunk head self-tapping screws is shallow. When used for wood such as particle board, it cannot provide sufficient tension. And iron objects have higher hardness, so they can provide sufficient tension.
2: When the screw is screwed in, the connected part will form a threaded hole. The shallower the thread, the smaller the deformation. If a hard object such as iron has sufficient tension, the smaller the deformation, the easier it will be to screw in.

What are fiberboard nails? How to distinguish from countersunk head tapping screws_Dongguan

应用中,纤维板钉与自攻钉的都较多地应用在家具领域,但因纤维板钉和沉头自攻螺丝非常的相似,常有人将两者混淆。 In the application of fasteners , fiberboard nails and self-tapping screws are mostly used in the field of furniture, but because fiberboard nails and countersunk head self-tapping screws are very similar, some people often confuse the two. Although fiberboard nails and countersunk head self-tapping screws are both types of self-tapping screws, there are still differences between the two. Let me briefly explain it for everyone!

Fiberboard nails, full name fiberboard screws, are now used instead of wood screws in many cases. Their applications are very wide and their sales in China are very large.


The appearance of fiberboard nails is generally silver, with countersinks, semi-sinks, round heads, etc. The threads are spirally rising in a single line, generally full teeth, with specifications of 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 6mm. The most commonly used in applications are 4mm, 5mm, 6mm.
Fiberboard nails have a high technical content, and the nails are not easy to crack. The problem of cracks in the staples in some hard wood can also be solved by modifying the thread design of ordinary fiberboard nails to make them claw-cut fiberboard nails. Fiberboard nails are most suitable for wood materials and suitable for power tool installation. At present, they are mainly used in furniture manufacturing, cabinets and other fields.
所生产的纤维板钉无论在质量还是价格方面,都是值得选择的。 The fiberboard nails produced by ingenious fasteners are worth choosing in terms of quality and price.




Countersunk head self-tapping screws. There are many types of heads. Generally countersunk heads and pan heads are more commonly used. The surface treatment is generally galvanized white and the color is slightly dim. There is a drill like a drill at the point. It is applied to wood, but its main purpose is to apply it to thin metal plates, such as the connection between thin iron plates and thin iron plates. The countersunk head tapping screw thread rises in a spiral, but the thread is smaller than the fiberboard nail, and the thread surface has a higher hardness. Therefore, in the thin metal plate connection, the internal thread can be tapped in the threaded bottom hole of the connected member, thereby forming the connection.
Therefore, from the design and application of countersunk head tapping screws, it can be known that self tapping screws such as countersunk head tapping screws are not suitable for use on wood.
1: The thread of self-tapping screws such as countersunk head self-tapping screws is shallow. When used for wood such as particle board, it cannot provide sufficient tension. And iron objects have higher hardness, so they can provide sufficient tension.
2: When the screw is screwed in, the connected part will form a threaded hole. The shallower the thread, the smaller the deformation. If a hard object such as iron has sufficient tension, the smaller the deformation, the easier it will be to screw in.

Jinming Cheats 丨 Are you still worried about screw loosening? Come and teach you

Threaded fastener technology, how to prevent bolts from loosening and loosening: When the machine is in operation, it will generate strong vibration and impact forces, which will cause some screws and bolts on the machine to be loosened and loosened due to impact and vibration. It brings great troubles and hidden dangers to production. These problems often plague producers and consumers in the machinery industry. The problem of bolt loosening is a problem in real life, and how to solve this problem?

There are three commonly used methods to prevent loosening: frictional, mechanical, and permanent. Mechanical and frictional locks are called removable locks, and permanent locks are called non-removable. Common permanent locks are: spot welding, bonding, etc. This method often destroys the threaded fasteners during disassembly and cannot be reused. Common friction prevention methods: use gaskets, self-locking nuts and double nuts. Common mechanical anti-loosening methods: use split pins, stop washers and string steel ropes. The method of mechanical loosening prevention is relatively reliable. For important connections, the method of mechanical loosening prevention is as follows:

Friction prevention:

(1) Spring washers prevent loosening

The spring washer material is spring steel. After assembly, the washer is flattened. Its rebound force can maintain the compression and friction between the threads to achieve anti-loosening.

(2) Anti-loosening of top nut

The use of the nut against the top effect causes the bolt type to receive additional tensile force and associated friction. Since one more nut is used and the operation is not very reliable, it is recommended to use less

(3) Self-locking nut to prevent loosening

A section of the nut is made into a non-circular necking or a radial necking after slitting. When the nut is tightened, the closing mouth is expanded, and the elasticity of the closing mouth is used to compress the screw threads. The anti-loosening structure is simple and reliable, and can be disassembled and installed repeatedly without reducing the anti-loosening performance.

(4) Anti-loosening of elastic ring nut

Fibers or nylon are embedded at the thread entry to increase friction. The elastic ring also functions to prevent liquid leakage.

Mechanical lock

(1) Slot nut and cotter pin prevent loosening

After the slot nut is tightened, use a cotter pin to pass through the small hole at the end of the bolt and the slot of the nut. Or you can tighten it with a common nut for drill pin control

(2) Round nut and stop washer

Insert the inner tongue of the washer into the groove of the bolt (shaft). After tightening the nut, fold one of the outer tongue of the washer into a groove of the nut.

(3) Stop washer

After the nut is tightened, the one- or two-ear stop washers are respectively bent and attached to the side of the nut and the coupled part to achieve loosening prevention. If two bolts are required to be double-locked, double-locking washers can be used.

(4) Anti-loosening of tandem steel wire

Use a low-carbon steel wire to penetrate the hole in the head of each screw, and connect the screws in series to brake each other. This structure requires attention to the direction in which the wire penetrates.

Permanent lock

(1) Punching method to prevent loosening

Punching point at the end of the thread after the nut is tightened to destroy the thread

(2) Bonding and loosening prevention

An anaerobic adhesive is usually applied to the threaded surface. After tightening the nut, the adhesive can be cured by itself, and the loosening effect is good.

Construction units are uneven, gaps exist between garden products and design ideas

Due to the misunderstanding of traditional understanding, some construction units think that the garden engineering is not technical and rigorous, the engineering risk is small, and the profit is high. It is just a simple matter to plant trees and grass, so some are called "urban farmers" A large number of green construction workers have been incorporated into the construction team. They lack the ability to deeply understand the design drawings and lack the systematic knowledge of plant cultivation techniques, which greatly reduces the quality of construction. As everyone knows, "three-point design, seven-point construction", a good design or creativity requires more effort and effort from the constructor, otherwise, the ideal artistic effect is also an aerial tower.

The project manager is responsible for controlling the flow, and the responsibility of the subject is not unified.

Since the promotion of the project manager accountability system, the level of project management in China has grown a lot, but there are still some problems. Due to many reasons, such as the system, the project manager accountability system has not been fully implemented in current landscaping projects, causing the project manager to take responsibility. The system is also superficial and superficial, and some project managers are in an embarrassing situation in which nothing exists, which leads to the phenomenon that project site management is not the project manager himself.

It is common to not strictly follow the drawings or change the design scheme at will

The construction of landscaping projects is to play the landscaping function of plants scientifically and artistically according to the design requirements. Therefore, the design drawings are the soul of landscaping projects. Without the design drawings, the construction of the project will not start. However, in the actual construction process, some constructors and constructors do not strictly follow the drawings for their own interests, subjectively changing the position, variety and specifications of seedlings, resulting in very different landscape effects and design intents; or according to individual wills, arbitrary changes The original design concept and scheme completely changed the designer's original composition.

Seriously inadequate attention to soil replacement and improvement

At present, in the construction of greening projects, the vast majority of planting soil is the damaged original structure soil, which is not conducive to the survival and growth of plants. In order to save costs, some construction units do not carry out soil replacement, and bury the construction waste on-site; do not clean up the soil that meets the planting requirements on the site; the soil improvement that is best known is the symbol of the soil surface Sexually sprinkled some peat soil, it did not improve at all. As everyone knows, the quality of the soil will directly affect the survival rate of the plants after planting and the later growth effects.

Construction of supervision talents lags behind, industry supervision and integrity mechanism exist

Although China's garden industry has developed rapidly in recent years, there have been many problems in the greening industry, such as the lack of professional talents in gardening supervision, the absence of supervision work, and the existence of loopholes in the industry supervision mechanism. Workers and supervisors turned a blind eye to the construction party's violation of the construction specifications, and some supervisors took the initiative to take food, which deteriorated the professional environment of the supervision. In addition, there are fewer mandatory clauses in the "Code for Construction and Acceptance of Urban Greening Projects", and the construction unit has discretion Larger. These problems have brought negative impacts to the supervision work and brought severe challenges to the credibility of the supervision.

Strict implementation of the bidding system and selection of construction units

Landscaping projects must strictly implement the bidding system, raise the industry threshold, and allow construction units with construction qualifications and good construction performance and credibility to participate in bidding. Even small-scale greening projects must also involve companies with greening construction qualifications. The construction quality of the garden project is fundamentally guaranteed. Only by implementing the survival of the fittest can construction units with low construction level and poor reputation be passively withdrawn from the garden construction industry, effectively solving the mixed situation of the landscape construction market.

Responsible for the right subjects, and thoroughly implement the project manager accountability system

Since the implementation of the project manager accountability system, China's project management has been brought into line with international standards and has achieved leapfrog development of China's project management. Although some bottlenecks in details have emerged, they are generally positive and progressive. We can only emancipate our minds and change our concepts. Actively explore and improve the system, unify the responsibilities, rights, and interests, strengthen the supervision of the project manager, strengthen the responsibility of the project manager, weaken the power and benefits of the project manager, pay heavy penalties and reward, and fully implement the project manager responsibility system. Effectively solve the awkward situation that the project manager is responsible for the flow of form and appearance.

Strictly follow the drawings and abide by the "one pen" system for design changes

We must grant and respect the designer's absolute right to speak on the design plan, and strictly follow the plan. If it is really necessary to change the plan, we must strictly follow the change procedure, ask the design unit and the chief designer for permission and signature, and implement the plan change. "Bill" system. For those who do not strictly follow the drawings and do not follow the design plan change procedures, the design unit and designer have the right to refuse to stamp and sign the as-built drawings. Only by strictly observing this basic red line can we guarantee the originality of design drawings from the system and the quality of landscaping projects from the source.

What is the standard of stainless steel bolts_Dongguan Jinming Hardware Co., Ltd.

Stainless steel bolts are one of the professional stainless steel fasteners produced by Jinming Hardware. When purchasing stainless steel bolts, some customers do not understand the standard specifications of stainless steel bolts. The following is a brief introduction of Jinyu screws.

Stainless steel bolt standards can refer to carbon steel bolt standards. Specifically according to international standards such as GB / T6170-2000 and GB / T5782-2000. The mechanical performance grade codes of stainless steel bolts and nuts are: A2-70 (0r18Ni9); A4-70 (0Cr17Ni12Mo2).

High-strength steel bolts and grades for steel joints of standard specifications. This specification covers two types of hardened and quenched and tempered alloy steel, large hexagon bolts for structural use, and tensile strength of 1040-1210 MPa. The American Institute of Building and Industrial Fasteners Association has approved the use of steel structural bolts ASTM A325 and A 490 bolts by the research committee. These bolts can be used in structures. Bolt specifications include bolt diameters M12-M36. They specify the type to indicate the chemical composition as follows: Type Description Description Type 1 Medium carbon alloy steel. This specification applies to research committees using ASTM A 325 and A 490 large hex structural bolts in their published steel structure codes. This standard states that imperial / pound is considered the only unit of measurement. No other unit of measure is included in the standard. This standard is not intended to deal with all potential safety hazards, if any, it has nothing to do with this standard. It is the responsibility of the user to determine the applicability and limitations of this standard before establishing appropriate safety and health practices. American Society for Testing Materials Standard A325. Specifications are A325 heat treated, high strength steel bolts with a minimum tensile strength of 120/105 kB / A 490. Grade A490 high strength bolts 10.9 and 10.9.3 are used for steel structural joints. A 563M Specification for Carbon and Alloy Steel Nuts (Metric) Specifications are A563M carbon steel and alloy steel nuts (metrics). The nut complies with the requirements of the A563M specification and is used in conjunction with the large hexagon bolt specification A 490M. Various grades of nut surface finish requirements are as follows: Bolt Type and Finish Nut Class and Finish Nut final selection. The alloys identified by the American Iron and Steel Institute are, within the maximum range of alloys. Elements exceed one or more of the following ranges: manganese, 1.65%. 0.60%; copper, silicon, 0.60%; or any specified element within a certain range or a clear, MOQ limit, requires the construction of approved alloy steel, aluminum, chromium to: 3.99%, Cobalt, columnum, molybdenum, nickel-titanium, tungsten, vanadium, zirconium, or any other, alloying elements are added to obtain the required alloying effect. Bolts with smaller diameter M24 have lengths ranging from 21.4 D to 2D, but cannot do so. The tensile test shall be the axial tension of the wedge, and shall comply with the minimum tensile load and proof load, or the agency proof load table 4. The bolt has a small diameter and a length M24 shorter than the hardness required for the 2D axial tensile test. After the hardness and tension tests of these two pairs of bolts are completed as required, the first reading with a low hardness is recorded. The purpose of this test is to evaluate the complete and incomplete decarburization and core hardness determined by the presence near different surfaces.
Hexagon socket stainless steel bolt
After comprehensive and comprehensive consideration of these five aspects, the grade, variety, specification and material standard of stainless steel bolts were finally determined.

Ferritic stainless steel

Type 430 ordinary chrome steel, which has better corrosion resistance and heat resistance than type 410 and has magnetic properties, but it cannot be strengthened by heat treatment. It is suitable for stainless steel with general requirements for strength and corrosion resistance and heat resistance. bolt.

Martensitic stainless steel

Types 410 and 416 can be strengthened by heat treatment, hardness is 35 ~ 45HRC, good machining performance, heat-resistant and corrosion-resistant stainless steel bolts for general use. Type 416 has a slightly higher sulfur content and is a free-cutting stainless steel.

Type 420, sulfur content? R0.15%, improved mechanical properties, heat treatment and strengthening, maximum hardness value 53 ~ 58HRC, used for stainless steel bolts requiring higher strength.

Precipitation hardened stainless steel

17-4PH, PH15-7Mo, they can get higher strength than ordinary 18-8 stainless steel, so they are used for high-strength, corrosion-resistant stainless steel stainless steel bolts.

A-286, a non-standard stainless steel, has higher corrosion resistance than the commonly used 18-8 stainless steel, and still has good mechanical properties at elevated temperatures. Used as high-strength, heat-resistant and corrosion-resistant stainless steel bolts, can be used to 650 ~ 700 ℃.

Austenitic stainless steel

The commonly used grades are four grades 302, 303, 304, and 305, the so-called "18-8" austenitic stainless steel. Both the corrosion resistance and the mechanical properties are similar. The starting point chosen is the production process method of stainless steel bolts, which depends on the size and shape of the stainless steel bolts, and also depends on the quantity produced.

Type 302 is used for machined screws and self-tapping bolts.

Type 303 In order to improve cutting performance, a small amount of sulfur is added to type 303 stainless steel, which is used to process nuts using bar stock.

Type 304 is suitable for processing stainless steel bolts by hot heading, such as longer specifications, large diameter bolts, which may exceed the scope of cold heading.

Type 305 is suitable for processing stainless steel bolts by cold heading, such as cold-formed nuts, hexagon bolts.

Types 309 and 310 have higher Cr and Ni contents than 18-8 stainless steel, and are suitable for stainless steel bolts working at high temperatures.

Types 316 and 317 both contain the alloying element Mo, so their high temperature strength and corrosion resistance are higher than those of 18-8 stainless steel.

Types 321 and 347, type 321 contains the more stable alloying element Ti, and type 347 contains Nb, thereby improving the intergranular corrosion resistance of the material. It is suitable for stainless steel standard parts that are not annealed or serviced at 420 ~ 1013 ℃.

What are the mechanical properties of stainless steel standard screws? _Dongguan city

For stainless steel standard parts, we need to understand its characteristics so that we can understand how to use standard parts is appropriate. I summarized four points about the performance of stainless steel standard parts. First, the high temperature resistance of stainless steel standard parts. Because the hardness of stainless steel itself is relatively strong, the standard parts after production have strong anti-oxidation ability, and they can not work normally under high temperature, and will not burn too much interference at high temperature. With passivation, the effect becomes better and better.

Second, the physical properties of stainless steel standard parts have a relatively high charge rate. Compared with carbon steel wire, we can see that the electrical charge rate of stainless steel standard parts is five times higher than that of carbon steel. There is an expansion coefficient in the standard parts. After testing, we know that if the temperature is higher, the expansion coefficient of the stainless steel standard parts will have a certain increase.

Third, the capacity of the force, for stainless steel standard parts, can withstand the load is being compared, although it can not be compared with high-strength bolts, but also meet the needs of normal people.

Fourth, the mechanical properties of stainless steel standard parts. We can see from this word that stainless steel standard parts mainly use stainless steel wire as the raw material, and then a series of processes such as piercing according to the steps of producing standard parts. In mechanical properties, we can know that many of them are related to stainless steel. The wire has a great relationship. For example, no rust and high corrosion resistance are closely related to the properties of stainless steel. With the continuous development of standard parts, these mechanical properties have become stronger and stronger.

Dongguan Jinming Hardware Co., Ltd. All rights reserved 粤 ICP 备 15117322 号 -9

Address: No. 305, Fuyuan District, Songmushan Village, Dalang Town, Dongguan City Phone: 400-0803-020 18929466801 Fax: 0769-83125550 / 83122630/83193372/38807778

Mobile: 18929466801 Contact: Mr. Guo

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