6 THINGS TO CONSIDER WHEN PURCHASING A VIBRATING SCREENER

 

 

Vibrating screeners are one of the highly effective units that ease the grading and screening of raw materials of different sizes. The demand for vibration screening equipment is increasing owing to the fact that they can handle complex and low precision material screening and classification easily and quickly compared to similar other products available in the market. There are a wide range of vibrating screeners available in several designs and drive sources for more efficient, more precise screening in food, pharmaceutical, chemical, steel, and mining industries. With so many vibrating screen models available in the market it often becomes a confusing task for the users to make the right purchase. This post is thus intended to provide you with information on how to purchase vibrating screener that rightly suits the purpose, location, and working conditions.

 

The Easy-to-Follow Guide to Vibrating Screener Purchase

There might be several questions bothering you when you look out to buy a vibrating screener. This is because of the multitude of options available in the market. So how to go about purchasing the right vibration screener for your applications. The following points will really help.

Varied Types: As mentioned earlier, when it comes to vibratory feeders, there are several types to choose from. Circular screeners, rectangular screeners and gyratory mechanical screeners are the most utilized forms of a vibrating screener. Each type is designed to serve a specific purpose. For instance, choose circular screeners when your application demands grading/screening minimal quantity of material. However, rectangular screeners are rightly suitable for heavy duty applications, which demand screening of a higher quantity of raw materials. Last but not least, gyratory mechanical screeners are the ones suitable for bulk sorting and grading.

Size of the Screen: It is the screen in the vibrating machine that determines the grading/sorting quality. Choosing a machine with the right screen size, thus holds an important consideration. Available in several aperture sizes, screen in the machine must also be chosen based on the type of raw materials that need to be graded.

Capacity: Consider the production needs and choose a model wisely. It is always a good decision to choose a circular type if there are relatively fewer materials to be sorted and if there is a space constraint at your facility. On the other hand, there is no point of choosing a circular or rectangular screener if you need to sort a large quantity in less time.

Application Areas:There are some sensitive areas like food processing and clean room wherein dust and noise generated by the machine would distract the other operations. Communicate with the manufacturer if you have such special requirements.

Longevity: If your application demands vibrating screeners that are ought to work continuously for a long time, then you must opt for one with a high quality vibrating motor. This guarantees continuous and stable functioning of the vibrating screen equipment without any downtime due to motor from burning and exploding.

Nature of Raw Materials: It is advisable to buy a vibrating screener after analyzing the type of materials to be sorted or screened. Look for the special characteristics of the materials such as high static electricity, strong adsorption, and sanitary requirements before deciding on a vibratory equipment model.

Other than the things aforementioned, you must also check for the following when looking out to purchase vibrating screener.

Cost:

• Maintenance requirements

• Operating temperature and speed

• Performance and operating conditions

• Bearing type and arrangement

• Materials of construction

• Space constraints in the application area

• Installation location (indoors or outdoors)

Once these aforesaid points are analyzed, you will certainly get an idea what to choose. From the variety of options available, you will definitely be left with a very few models that serve your purpose. Hence, the selection becomes simple and to the specific requirements. You can also seek help from the supplier from whom you are sourcing the item. If you are opting to buy a vibrating screener from leading suppliers, then they will surely have a team of experts who can help you locate the right model after analyzing your requirements. One such leading name who can offer you a large variety of vibrating screener along with unmatched customer assistance is Changsong Industrial.

How to Choose Your Hydraulic Fitting

 

 

Hydraulic fittings can connect a variety of materials, including tubes, pipes or hoses to components such as pumps, valves or cylinders. When combining these components, you create a leak free system that hydraulic fluid allows for safe transmission. There’s a multitude of fitting configurations and variations to choose from. So, designers have the ability to change the direction of flow, split flows and alter the elevation of lines. Therefore, we have put together some information on how to choose your hydraulic fitting.

 

What Makes Each Hydraulic Fitting Unique?

There are a large variety of fittings available, including the following:

• plugs

• unions

• elbows

• crosses

The threads of the connections is what significantly differentiates these fittings. In addition, SAE, NFPA and ISO documents can also help you distinguish your standard which will help you confirm the diameter and type of thread your fitting has.

The connection of fittings is possible in the following ways:

• welding

• threaded

• flanged

• barbed

• quick disconnect

• push to connect

• 37° flare

• 24° flare

• staple lock

• face seal

• push-fit

• press fit

With a non-flanged fitting, these products will have a gender of one of the following that join together to form a union:

• male (threads on the outside)

• female (threads on the inside)

 

 

Factors to Consider When Choosing Your Hydraulic Fitting

When deciding on which type of fitting to select for your system, there a few important factors to consider. These include the following:

• working pressure

• vibration

• fitting configuration

• desired attachment

• size of piping

• flow

• material of the conductor or component you are connecting to

• pricing requirements

Equally as important is the use of a seal. The fluid power industry is slowly converting to elastomeric seals to help prevent leakage. However, depending on your application, you must ensure that your seal is compatible with the type of hydraulic fluid flowing through your system. Very few applications will require anything other than Buna Nitrile or Viton.

The majority of fitting types are available in different materials including the following:

• plastic

• brass

• copper

• steel

• stainless steel

• specialty materials

Base your material selection on the fluid flowing through your hydraulic system as well as ambient conditions. Depending on what you need for your application, each material will have different performance characteristics. Often times, the first obstacle to tackle is matching your fitting to a similar material to the conductor or component that you will connect it to.

Another important component is choosing the geometry of your fitting. Generally, the geometry fitting is the alphabet letter the fitting resembles. There are fittings that can change the direction of flow and various increments (45° or 90° elbows [L]), or a swivel that allows two jointed sections the ability to rotate. You can also find fittings that have the capability to split or combine flows with the following:

• run or branch tees (T)

• “wahys” (Y)

• crosses (+)

 

Hydraulic Fitting Dash Sizes

Depending on your system, you may need larger or smaller sizes to fit flow demands. The expression of fitting connection size is typically in dimensionless terms representing 1/16 of an inch.

For instance, if someone calls out a “-0.6 thread,” they man the size is 3/8 or 6/16 of an inch. A “dash 32” size is a 2-inch connection or 32/16 of an inch. Also, the thread type of the fitting will determine the connection sizes.

These are just a few important factors to determine how to choose your hydraulic fitting. Contact us here at Changsong for more information!

Home >> News >> News How Do I Route Hydraulic Hoses? -10 Suggestions

 

 

Safety and security and also performance are top considerations when using hydraulic hose. To assure performance and also avoid potential risks in the work environment, proper setup is critical. A secure workplace and desired performance both need appropriate hydraulic hose directing, and these handy installation pointers are one method to guarantee efficiency and also aid avoid early hose failure.

 

Do Not Exceed Minimum Bend Radius

Use tools to avoid exceeding the minimum bend radius. Bending hose beyond the recommended bend radius places excessive stress on hose reinforcement can create large holes between strands of hose reinforcement, and severely reduces the hose's pressure capacity. Exceeding the minimum bend radius can result in a burst hose. The minimum bend radii for each hose is stated in the hose tables in the catalog.

 

Allow for Slack

Use tools that provide enough slack to allow for changes in length to occur when hose is pressurized. Hydraulic hose is capable of elongating up to 2% or contracting up to 4%, depending on construction. The hose length must be determined so that the hose assembly has enough slack to allow the system components to move or vibrate without creating tension in the hose. The service life of hose is reduced if hose assemblies do not permit adequate flexing and allow for length changes due to expansion or contraction. When pressurized, a hose that is too short may stress the hose fitting connections or pull loose from its fittings, causing premature metallic or seal failures. It is important not to allow too much slack and therefore introduce the risk of the hose snagging on other equipment or rubbing on other components.

 

Use Elbow Fittings or Adapters When Necessary

A general rule of thumb for hose installation is if the hose needs to bend immediately before the metal fitting, you should keep it straight for at least twice the outside diameter (O.D.). If that’s not possible, use a 90 or 45-degree elbow fitting. This prevents fluid under pressure, traveling at high speeds, from directly impacting the core tube, which can deteriorate the hose and cause premature failure. Adapters ease port connections and hose installation and can be used to change thread configuration. Adapters should be used sparingly to keep assembly components at a minimum to avoid longer assembly time and cost, and prevent potential leak points in hose assembly.

 

Avoid Twisting the Hose

Avoid placement that requires twisting the hose during installation, as it misaligns the reinforcement and reduces a hose’s capacity to withstand pressure. A simple way to identify twisting is to look at the layline, which is the continuous line of information printed on a hose with the part number, pressure, etc. If the layline is twisted like a candy cane, it means that the hose was twisted during installation, which can cause premature hose failure.

 

The Plane of Movement Must be Considered

Be sure to route high-pressure hydraulic hose parallel to machine contours using elbows or adapters. This decreases the length of hose lines and reduces hard angle bends that restrict flow and strain the hose, saving money and maximizing hose capability.

 

Avoid Abrasive Influences

Avoid placing hose near any object with sharp or abrasive surfaces, or too close to other hoses as direct surface contact with equipment components, hoses, or material in the operating environment will cause abrasive wearing of the outer cover, risking exposure of the reinforcement. However, if the application is such that contact cannot be avoided, either a hose with a higher abrasion resistant hose cover or a protective sleeve should be used. Parker ToughCover (TC) or SuperTough (ST) covers offer 80 times and 450 times respectively the abrasion resistance of standard rubber covers.

 

There is a Right and Wrong Way to Clamp Hoses

Keep in mind the mechanical movement and vibration of hose when bundling. Crossing or clamping high- and low-pressure hoses together can lead to wear in the hose covers, decreasing productivity and risking safety hazards. Correct clamping should be exercised to securely route the hose and avoid the hose contacting surfaces that will cause the hose damage. If hose follows a compound bend, it should be coupled into separate segments or clamped into segments that flex on a single plane.

 

Do Not Mix Hoses and Fittings

To ensure maximized service life and safe function, do not mix and match hoses and fittings from different manufacturers. It is vital to work capability and safety that the hose and fitting manufacturer are the same, and that the assembly uses the recommended equipment, parts, and procedures as per the manufacturer. Correct fittings can avoid unnecessary strain on the hose, excess length, or multiple threaded joints.

 

Plan for Future Maintenance

Few things are more aggravating that having to take apart adjoining assemblies to access a specific hose that needs maintenance. Avoid this scenario by using different combinations of hose ends and tube fittings, such as short and long straights, or short and long elbows. Taking this step when installing a hose reduces maintenance effort and downtime. Avoid unnecessary hose strain by utilizing elbows and adapters for ease of routing. These tools help to relieve strain on the assembly and allow for clean, accessible installations. Inspection and maintenance might be necessary, so prohibitive design routings of hose assemblies should be avoided.

 

Temperature Directly Affects Hose Life

Keep hydraulic hoses away from external heat sources, as high ambient temperatures shorten hose life. Temperature increases of can lead to cracking and shorten hose life. The more extreme the ambient temperature is, weather hot or cold, the more durable the hose cover needs to be. Another option would be installing sleeves, which can help protect hose from hot equipment parts and other high temperature sources that are potentially hazardous.

 

We are a Hydraulic Hoses supplier, please feel free to contact us if you need them!

Vibrating Screens Use General Knowledge

 

 

Do you know what you need to pay attention to when using a vibrating screen? Read on for more tips on how to use a vibrating screen.

 

Installation of vibrating screen

1. Remove the transport support. Since the base of the sieve machine and the screen frame are connected by springs, the upper part of the sieve machine is firmly supported by transport support during transportation. After entering the installation site, the transport support should be taken down. It is strictly forbidden to try the machine without taking the transport support.

2. The sieve machine should be installed on a horizontal foundation. In the occasion of not playing the foundation, should be laid between the table and the machine seat anti-vibration rubber plate.

3. The vibrating motor and the cable line in the screen machine are subjected to severe vibration, and the standard ground should be connected for safety.

 

Adjustment of the phase angle of the upper and lower weights of the motor

1. Changing the phase angle of upper and lower hammers can change the trajectory and residence time of materials on the net. In order to make the sieve machine adapt to the separation state required by various materials, such as the distribution of materials, processing capacity, separation efficiency, over the net rate, and other changes. It should be adjusted to the best condition.

Note: The direction of operation of the two motors is reversed to each other! Two motors can run inward or outward at the same time.

2. motor phase angle adjustment. The phase angle of the upper and lower weights decreases or increases, and its effect is to increase or decrease the excitation force of the sieve machine. According to the number of layers of the user's sieve machine, the material-specific gravity is different to increase or decrease the excitation force. Adjustment of the phase angle of the motor weight can achieve the best screening effect. The phase angle of the motor up and down must be the same.

3. sometimes due to the specific gravity of the material, humidity, stacking tilt angle, and other parameters, the above adjustment phase is not possible to adjust successfully at once. So please ask the user to have sufficient patience to adjust, so that the sieve machine can play the high efficiency as it should.

 

Test run

1. Close the power switch, run 20-30 minutes air rotation, the motor should normally run in a counterclockwise direction, if the direction is not correct, please adjust the three-phase power supply.

2. should confirm that the vibration motor is running within the rated current, at the beginning of the operation, especially in low-temperature occasions, the current will be slightly higher, but within 20-30 minutes, it should be reduced to the rated current value.

3. Vibrating screen shall not have abnormal sound occurring, if the abnormal sound occurs, the machine shall be quickly shut down for inspection, the occurrence of abnormal sound is generally caused by the fastening part loosening. Especially in the transport and disassembly and reassembly, pay attention to the fastening of the parts. Sieve machine in the start and stop when there is a momentary resonance area (1-3 seconds) when the amplitude and noise will increase significantly, is a normal phenomenon.

4. After the empty operation, a small amount of material can enter the sieve machine through the inlet, and then slowly increase to the required and can withstand the amount of material, at this time should be adjusted according to the net surface out of the heavy hammer, so that the efficiency of the sieve machine to achieve the best state.

5. The general material of this series screen machine is not equipped with a bouncing ball device to meet the screening requirements, special materials need to be equipped with bouncing ball device separately designed and installed, no-load noise will increase at this time.

 

Screen mesh replacement

1. When the screen is found to be broken and needs to be replaced with a new screen, just loosen the external locking handle, take off the screen grid, take out the screen frame, remove the rubber seal, fasten bolts, and loosen the fastening bolts of the screen frame to replace the broken screen.

2. Then replace the screen with a new one, and reassemble it according to 6.1 in reverse order. Note: the net must be flat and solid, to lock the lower bolt of the screen frame first, and then lock the upper bolt, the two external V-groove bolts must be tightened.

 

Maintenance of equipment

1. The equipment should be refueled frequently when it is running, twice a week, inject Shell, Avalanche, RL3 grease.

2. every three months to carry out minor repairs and maintenance, 6-12 months for a major overhaul, overhaul to check the motor, the fasteners are not loose, disassemble the vibrator to clean and check the bearings, oil seals, serious wear should be replaced.

3. regularly check the cable (three months to change the motor lead)

 

We are a vibrating screen supplier, please feel free to contact us if you need them.

How Does a Swivel Joint Work?

 

 

Swivel Joints come in various shapes and sizes based upon the application and the environment where it goes through. While style consideration needs to be provided to outside elements, all the swivel joints have 2 primary components: a shaft as well as real estate.

The idea behind a swivel allows the shaft to rotate while the real estate remains fixed-ready. The shaft has actually pierced holes of varying size and also depth beginning with its leading surface area. Variable opening midsts, as well as markings, define the circulation path of fluid within the swivel. Via inner design, the fluid is performed the shaft right into and also out of the swivel joint.

The real estate system includes machined flow as well as grooves to assist in liquid transfer within the swivel and also protect against cross leakages. Phoned number markings are found on the real estate outer diameter surface area and also the same can be discovered on the leading surface area of the shaft.

These numbers specify where an individual would anticipate the fluid to move in/out in between shafts as well as real estate via the machined inner passages. A collection of very carefully selected inner elements are fitted between the shaft as well as real estate at specified locations. These include seals, breaks rings, O rings, wearings, tiny bearings in specific applications.

The choice of interior parts is of vital importance while designing a swivel joint as severe interest needs to be given to the tolerances as well as the inner layout of the real estate grooves. Failing to comply with the advised layout and also machining requirements leads to leaking elements.

The flow of power, as well as signals, are sometimes required for particular applications and industries. Slide rings can be incorporated with the swivel joint via passing electrical cable televisions within the hollow inner size of the shaft.

 

Exactly how to Select a Swivel Joint?

 

In contrast to various other rotary parts in the exact same industries, a swivel joint mostly endures interior loads while functional. This is a direct outcome of pressurized fluid flowing within its interior components. To pick an appropriate swivel joint, multiple influencing factors should be thought about.

The most influencing element on a swivel joint is the inner securing option between the shaft and also housing. Really precise tolerances have to be preserved during the machining phase to create the required grooves for seals as well as inner elements to be fit.

Seals, o-rings, use rings, and bearings are inserted within these internal grooves and have to be able to endure the pressures caused by the fluid Swivel joints are rated by the manufacturer regarding their recommended operating pressures, temperatures, and speeds.

These values are directly associated with the interior elements requirements, geometric machining tolerances, and type of liquid used the substantial layout as well as area factors to consider the need to be given for a swivel joint and its ports.

Based on application needs, a swivel joint might have up to 9 different ports to provide fluid with various flows. A greater variety of paths result in substantial dimension as well as product boost.

Swivel joints can be customized in dimension as well as port dimensions with respect to application requirements. Space constraints, lots requirements, task cycle, as well as environmental surroundings are all variables that are taken into consideration while choosing an appropriate part

 

We are a swivel joints supplier, please contact us if you need them.

Know About Swivel Joint

 

 

What is a Swivel Joint?

 

Swivel joints, also known as rotary unions are made use of in applications where a continuous transmission of fluids from a stationary resource to a revolving resource is called for without cross-contamination or leak. Normal applications use swivel joints to allow for 360-degree rotation while maintaining hoses from obtaining tangles as elements transform. In return, mechanical stress and anxieties that would result from hose pipe turning, flexing, as well as extending can be alleviated.

Swivel joints are crafted to operate at a variety of pressure and also temperature levels for a variety of conditions as well as settings. Based upon market needs, the swivel joint can be designed to have numerous flows as well as can transfer different sorts of liquid all at once at numerous rotational rates. Generally, as the number of passages increases, the size boosts, and the rate will certainly be reduced.

 

How Does a Swivel Joint Work?

 

Swivel Joints come in various shapes and sizes based upon the application and the environment where it goes through. While style consideration needs to be provided to outside elements, all the swivel joints have 2 primary components: a shaft as well as real estate.

The idea behind a swivel allows the shaft to rotate while the real estate remains fixed-ready. The shaft has actually pierced holes of varying size and also depth beginning with its leading surface area. Variable opening midsts, as well as markings, define the circulation path of fluid within the swivel. Via inner design, the fluid is performed the shaft right into and also out of the swivel joint.

The real estate system includes machined flow as well as grooves to assist in liquid transfer within the swivel and also protect against cross leakages. Phoned number markings are found on the real estate outer diameter surface area and also the same can be discovered on the leading surface area of the shaft.

These numbers specify where an individual would anticipate the fluid to move in/out in between shafts as well as real estate via the machined inner passages. A collection of very carefully selected inner elements are fitted between the shaft as well as real estate at specified locations. These include seals, breaks rings, O rings, wearings, tiny bearings in specific applications.

The choice of interior parts is of vital importance while designing a swivel joint as severe interest needs to be given to the tolerances as well as the inner layout of the real estate grooves. Failing to comply with the advised layout and also machining requirements leads to leaking elements.

The flow of power, as well as signals, are sometimes required for particular applications and industries. Slide rings can be incorporated with the swivel joint via passing electrical cable televisions within the hollow inner size of the shaft.

 

Exactly How to Select a Swivel Joint?

 

In contrast to various other rotary parts in the exact same industries, a swivel joint mostly endures interior loads while functional. This is a direct outcome of pressurized fluid flowing within its interior components. To pick an appropriate swivel joint, multiple influencing factors should be thought about.

The most influencing element on a swivel joint is the inner securing option between the shaft and also housing. Really precise tolerances have to be preserved during the machining phase to create the required grooves for seals as well as inner elements to be fit.

We are a Swivel Joint supplier, please contact us if you need them.

What Are the Types of Vibrating Screens?

 

 

Do you know the types of vibrating screens? Read on for more information.

 

Inclined screen

 

The inclined screen is the simplest type of screen, mounted on a frame inclined at an angle between 15° and 30°. The entire screen body oscillates on circular coil springs with the same characteristics, and the material flow is fed by gravity acceleration.

 

Inclined screens consist of eight basic components, namely side walls, bridges, screen material, exciter, electric motor, motor support, spring and spring supports. The main critical factor of inclined screens is their flawless design. All the parts mentioned here are assembled with nuts and bolts to prevent the screen body from breaking and failing due to welding.

 

The inclination of the tilting screen is fixed, but the stroke can be adjusted to the desired level. The general working stroke of a tilting screen is between 8 and 12 mm, and the design of tilting screens allows this stroke to be changed by adding or removing additional eccentric weights on the exciter.

 

Tilt screen exciters are usually driven by an external electric motor that transmits power through a belt and pulley mechanism. Oscillating exciters are not used for tilt screens because of their rigid operating principle. The advantage of the circular vibratory exciter mechanism used in tiltable screens is its simplicity, low maintenance requirements, and economical design.

 

Tiltable screens are usually equipped with multiple decks so that the material can be classified into 2 to 5 classes. In addition, these screens are usually equipped with an impact zone just before the start of the screen section, which breaks up the material and ensures that the long pieces are deposited horizontally during screening.

 

Horizontal screen

 

A horizontal screen is an unconventional design with unique features that distinguish it from other conventional screen types. Its most obvious advantage is its working angle. While conventional screens operate at an angle between 15° and 30°, horizontal screens are placed parallel to the ground or at a slight angle between 0° and 5° degrees.

 

The stroke of horizontal screens can be adjusted in the range of 14 to 20 mm, although they generally operate with a stroke of 16 to 18 mm and a rotational speed of 750 rpm. The flow velocity of the material in the screening medium varies between 0.2 m/s and 0.25 m/s. The mass throughput depends on the phase angle differences between the eccentric masses.

 

Horizontal screens are equipped with a triple drive mechanism that produces an elliptical oscillatory motion with the desired stroke and inclination. As mentioned in the previous section on the excitation mechanism, the triple drive mechanism combines the linear and circular vibration modes into one elliptical vibration. In this way, the advantages of both types of vibration are combined in a horizontal screen so that the material is transported horizontally at a speed determined by the linear vibration motion, while the circular vibration characteristic of the elliptical motion prevents sedimentation.

 

Horizontal screens have brought many advantages to screening operation, although they also have some disadvantages, the most important of which is the complexity of the triple drive mechanism. Although the triple drive mechanisms are designed to be robust enough to withstand all conditions, the maintenance procedures are not short, although the robustness of the design makes frequent maintenance unnecessary.

 

Dewatering screen

 

Dewatering screens are designed to remove water from the slurry and reduce the water content of the material. These systems consist of a pair of vibration motors, support for the vibration motor, screen support, and a screen. The screen surface is slightly inclined (between 0° and 5°) to facilitate dewatering, and the operating speed is between 1000 and 1500 RPM.

 

Unlike screens for dry materials, dewatering screens operate with G-forces greater than 5 g and ensure perfect dewatering. Generally, a range of 5 g and 6 g is used. This condition is necessary for good dewatering.

 

The counter-rotating vibrators generate a linear vibration that causes the screen body to vibrate with the slurry. The water contained in the slurry is dewatered by the vibration and runs off the bottom of the screen surface as the material is advanced. In this way, a pool of water forms in the valley, while the sand accumulates on the downward sloping surface. The upward slope of the grate, combined with a drainage channel, creates a deep bottom that serves as a filter medium and retains material much finer than the grate openings.

 

Due to the humid and corrosive environment of the dewatering silo, rubber springs must be used in the support legs to absorb the vibration load of the moving frame, extending the life and maintenance time of the screen.

 

High-frequency screens

 

High-frequency screens are designed to provide higher throughput and more efficient classification than conventional screens. High-frequency screens use aggressive vibrations that act directly on the screen, providing the highest capacity on the market for removing fines and cleaning chips, dry sand, and more.

 

The high frequency and low amplitude provide higher speed material movement without loss of screening efficiency. This combination of high frequency and amplitude is ideal for fine material screening, where coarse particles are lifted higher while finer particles remain closer to the screen, increasing the likelihood of separation with high-frequency screens.

 

Unlike other types of screens, the vibration motors of high-frequency screens are mounted in each plane rather than in the screen housing. The aggressive vibrations are transmitted directly to the material being screened in the range of 3600 to 5000 rpm, resulting in higher productivity and more efficient screening than conventional screens. Under the influence of the high-frequency vibrations, the depth at the bottom is reduced, allowing stratification and better screening performance.

 

We are a Vibrating Screen supplier, please feel free to contact us if you need them.