China Good quality Automatic Wastewater Treatment Volute Screw Press Sludge Dewatering Machine supplier

Product Description



DW screw press sludge dewatering machine is a new type of filter press. Its unique mechanical structure makes it have the advantages of small floor area, no blockage, automatic unattended operation, no need of sedimentation tank and sludge thickening tank. Compared with the traditional belt filter pressand plate and frame filter press, the closed design can greatly improve the site environment. The driving motor adopts the gear reducer with low speed and high torque, which has lower energy consumption and noise compared with the centrifuge.The main body of screw filter press is made of multiple fixed plates and moving plates with the screw shaft running through it.The front part is concensed section and the ending part is dewatering section. It can concentrate  and dewater sludge in 1 chamber.Sludge will be transported to the dewatering part after being concentrated in the dewatering section.In the advancing process, great pressure has been produced because of the gradually decreasing filter spacing and screw distance with the block of the back platen .Then the volume decrease continuously,and the purpose of fully dewatering will be achieved.

Model Appearance size(mm) Spiral specifications Power(kw) Net weight(kg) Operating weight(kg)
DW-101 1610 680 950 φ100×1 0.2 150 210
DW-131 1920 730 980 φ130×1 0.3 205 300
DW-132 1920 780 980 φ130×2 0.4 270 420
DW-201 2460 780 1270 φ200×1 0.55 340 490
DW-251 2690 880 1600 φ250×1 0.92 500 805
DW-202 2540 960 1270 φ200×2 1.11 460 680
DW-301 3360 930 1750 φ300×1 0.9 900 1310
DW-302 3560 1250 1750 φ300×2 1.62 1350 2100
DW-303 3820 1600 1750 φ300×3 2.62 1880 2840
DW-304 4100 2000 1750 φ300×4 3.37 2400 3760
DW-351 4571 1150 2200 φ350×1 1.65 1600 2230
DW-352 4210 1550 2200 φ350×2 3.3 2350 3450
DW-353 4420 2150 2200 φ350×3 4.4 3360 4860
DW-354 4640 2650 2200 φ350×4 5.8 4480 6080
DW-401 4560 1250 2400 φ400×1 3 2400 4200
DW-402 4900 1620 2400 φ400×2 4.5 3460 6100
DW-403 5030 2200 2400 φ400×3 6.2 5450 8000
DW-404 5300 3180 2400 φ400×4 8 6850 9580

Model Raw water,Residual sludge,Chemically precipitated sludge scum,Pressurized air flotation sludge Mixed sludge,Aerobic digestion sludge,Municipal sludge
Sludge concentration(TS) 0.2% 1.0% 2.0% 5.0% 3.0%
DW-101 ~2kg-Ds/h(~1.0m³/h) ~3kg-Ds/h(~0.3m³/h) ~5kg-Ds/h(~0.25m³/h) ~10kg-Ds/h(~0.2m³/h) ~13kg-Ds/h(~0.435m³/h)
DW-131 ~4kg-Ds/h(~2.0m³/h) ~6kg-Ds/h(~0.6m³/h) ~10kg-Ds/h(~0.5m³/h) ~20kg-Ds/h(~0.4m³/h) ~26kg-Ds/h(~0.87m³/h)
DW-132 ~8kg-Ds/h(~2.0m³/h) ~12kg-Ds/h(~1.2m³/h) ~20kg-Ds/h(~1.0m³/h) ~40kg-Ds/h(~0.8m³/h) ~52kg-Ds/h(~1.73m³/h)
DW-201 ~8kg-Ds/h(~2.0m³/h) ~12kg-Ds/h(~1.2m³/h) ~20kg-Ds/h(~1.0m³/h) ~40kg-Ds/h(~0.8m³/h) ~52kg-Ds/h(~1.73m³/h)
DW-202 ~16kg-Ds/h(~8.0m³/h) ~24kg-Ds/h(~2.4m³/h) ~40kg-Ds/h(~2.0m³/h) ~80kg-Ds/h(~1.6m³/h) ~104kg-Ds/h(~3.47m³/h)
DW-301 ~20kg-Ds/h(~10m³/h) ~30kg-Ds/h(~3.0m³/h) ~50kg-Ds/h(~2.5m³/h) ~100kg-Ds/h(~2.0m³/h) ~130kg-Ds/h(~4.33m³/h)
DW-302 ~40kg-Ds/h(~20m³/h) ~60kg-Ds/h(~6.0m³/h) ~100kg-Ds/h(~5.0m³/h) ~200kg-Ds/h(~4.0m³/h) ~260kg-Ds/h(~8.67m³/h)
DW-303 ~60kg-Ds/h(~30m³/h) ~90kg-Ds/h(~9.0m³/h) ~150kg-Ds/h(~7.5m³/h) ~300kg-Ds/h(~6.0m³/h) ~390kg-Ds/h(~13m³/h)
DW-304 ~80kg-Ds/h(~40m³/h) ~120kg-Ds/h(~12.0m³/h) ~200kg-Ds/h(~10.0m³/h) ~400kg-Ds/h(~8.0m³/h) ~520kg-Ds/h(~17.34m³/h)
DW-351 ~40kg-Ds/h(~20m³/h) ~60kg-Ds/h(~6.0m³/h) ~100kg-Ds/h(~5.0m³/h) ~200kg-Ds/h(~4.0m³/h) ~260kg-Ds/h(~8.67m³/h)
DW-352 ~80kg-Ds/h(~40m³/h) ~120kg-Ds/h(~12.0m³/h) ~200kg-Ds/h(~10.0m³/h) ~400kg-Ds/h(~8.0m³/h) ~520kg-Ds/h(~17.3m³/h)
DW-353 ~120kg-Ds/h(~60m³/h) ~180kg-Ds/h(~18.0m³/h) ~300kg-Ds/h(~15.0m³/h) ~600kg-Ds/h(~12.0m³/h) ~780kg-Ds/h(~26m³/h)
DW-354 ~160kg-Ds/h(~80m³/h) ~240kg-Ds/h(~24.0m³/h) ~400kg-Ds/h(~20.0m³/h) ~800kg-Ds/h(~16.0m³/h) ~1040kg-Ds/h(~34.68m³/h)
DW-401 ~70kg-Ds/h(~35m³/h) ~100kg-Ds/h(~10.0m³/h) ~170kg-Ds/h(~8.5m³/h) ~340kg-Ds/h(~6.5m³/h) ~442kg-Ds/h(~16m³/h)
DW-402 ~135kg-Ds/h(~67.5m³/h) ~200kg-Ds/h(~20.0m³/h) ~340kg-Ds/h(~17.0m³/h) ~680kg-Ds/h(~13.6m³/h) ~884kg-Ds/h(~29.5m³/h)
DW-403 ~200kg-Ds/h(~100m³/h) ~300kg-Ds/h(~30.0m³/h) ~510kg-Ds/h(~25.5m³/h) ~1571kg-Ds/h(~20.4m³/h) ~1326kg-Ds/h(~44.2m³/h)
DW-404 ~266kg-Ds/h(~133m³/h) ~400kg-Ds/h(~40.0m³/h) ~680kg-Ds/h(~34.0m³/h) ~1360kg-Ds/h(~27.2m³/h) ~1768kg-Ds/h(~58.9m³/h)

Q: Are you trading company or manufacture?
A: We are both manufacture and trading company. We have over many years’ professional experience as a waste water treatment equipment manufacturer and engineering service enterprise.

Q: Where is your factory located?
A: No. 88 Xingjiang Road, Xihu (West Lake) Dis. District, HangZhou City, ZheJiang Province, not far from ZheJiang .

Q: Do you provide OEM service?
A: Yes. 

Q: How about the production capacity of your company?
A: Our factory covers area over 8000M2 and produces machines 1800 sets per year.

Q: How could we trust you and your company? This is first time transaction?
A: Our company has many years professional experience. We cooperate many customers in China and overseas. We export nearly 20 countries all over the world. Welcome to our company and watch our plant production condition any time.

Q: What certificates do you have?

Q: Do you offer after-sales service?
A: Yes. Engineers available.

Q: How long is your warranty?
A: One year after the arrival of the goods. During this period, as long as it is not a man-made damage, we send the damaged parts free of charge.

Q: What about your delivery Time?
A: Normally within 45 days against down payment.

Q: What about the package of your export product?
A: We use anticorrosion wooden case with foam inside.

Q: What kind of payment do you accept?

Q: What kind of transportation do you offer?
A: Customers decide freight mode, Air, Land & Sea .

After-sales Service: Help Check
Warranty: One Year
Type: Sludge Dewatering Machine
Method: Physical Treatment
Usage: Industrial, Home, Agriculture, Hospital
Model No.: 402


Customized Request


Screw Sizes and Their Uses

Screws have different sizes and features. This article will discuss screw sizes and their uses. There are two main types: right-handed and left-handed screw shafts. Each screw features a point that drills into the object. Flat tipped screws, on the other hand, need a pre-drilled hole. These screw sizes are determined by the major and minor diameters. To determine which size of screw you need, measure the diameter of the hole and the screw bolt’s thread depth.

The major diameter of a screw shaft

The major diameter of a screw shaft is the distance from the outer edge of the thread on one side to the tip of the other. The minor diameter is the inner smooth part of the screw shaft. The major diameter of a screw is typically between two and sixteen inches. A screw with a pointy tip has a smaller major diameter than one without. In addition, a screw with a larger major diameter will have a wider head and drive.
The thread of a screw is usually characterized by its pitch and angle of engagement. The pitch is the angle formed by the helix of a thread, while the crest forms the surface of the thread corresponding to the major diameter of the screw. The pitch angle is the angle between the gear axis and the pitch surface. Screws without self-locking threads have multiple starts, or helical threads.
The pitch is a crucial component of a screw’s threading system. Pitch is the distance from a given thread point to the corresponding point of the next thread on the same shaft. The pitch line is one element of pitch diameter. The pitch line, or lead, is a crucial dimension for the thread of a screw, as it controls the amount of thread that will advance during a single turn.

The pitch diameter of a screw shaft

When choosing the appropriate screw, it is important to know its pitch diameter and pitch line. The pitch line designates the distance between adjacent thread sides. The pitch diameter is also known as the mean area of the screw shaft. Both of these dimensions are important when choosing the correct screw. A screw with a pitch of 1/8 will have a mechanical advantage of 6.3. For more information, consult an application engineer at Roton.
The pitch diameter of a screw shaft is measured as the distance between the crest and the root of the thread. Threads that are too long or too short will not fit together in an assembly. To measure pitch, use a measuring tool with a metric scale. If the pitch is too small, it will cause the screw to loosen or get stuck. Increasing the pitch will prevent this problem. As a result, screw diameter is critical.
The pitch diameter of a screw shaft is measured from the crest of one thread to the corresponding point on the next thread. Measurement is made from one thread to another, which is then measured using the pitch. Alternatively, the pitch diameter can be approximated by averaging the major and minor diameters. In most cases, the pitch diameter of a screw shaft is equal to the difference between the two.

The thread depth of a screw shaft

Often referred to as the major diameter, the thread depth is the outermost diameter of the screw. To measure the thread depth of a screw, use a steel rule, micrometer, or caliper. In general, the first number in the thread designation indicates the major diameter of the thread. If a section of the screw is worn, the thread depth will be smaller, and vice versa. Therefore, it is good practice to measure the section of the screw that receives the least amount of use.
In screw manufacturing, the thread depth is measured from the crest of the screw to the root. The pitch diameter is halfway between the major and minor diameters. The lead diameter represents the amount of linear distance traveled in one revolution. As the lead increases, the load capacity decreases. This measurement is primarily used in the construction of screws. However, it should not be used for precision machines. The thread depth of a screw shaft is essential for achieving accurate screw installation.
To measure the thread depth of a screw shaft, the manufacturer must first determine how much material the thread is exposed to. If the thread is exposed to side loads, it can cause the nut to wedge. Because the nut will be side loaded, its thread flanks will contact the nut. The less clearance between the nut and the screw, the lower the clearance between the nut and the screw. However, if the thread is centralized, there is no risk of the nut wedgeing.

The lead of a screw shaft

Pitch and lead are two measurements of a screw’s linear distance per turn. They’re often used interchangeably, but their definitions are not the same. The difference between them lies in the axial distance between adjacent threads. For single-start screws, the pitch is equal to the lead, while the lead of a multi-start screw is greater than the pitch. This difference is often referred to as backlash.
There are two ways to calculate the pitch and lead of a screw. For single-start screws, the lead and pitch are equal. Multiple-start screws, on the other hand, have multiple starts. The pitch of a multiple-start screw is the same as its lead, but with two or more threads running the length of the screw shaft. A square-thread screw is a better choice in applications requiring high load-bearing capacity and minimal friction losses.
The PV curve defines the safe operating limits of lead screw assemblies. It describes the inverse relationship between contact surface pressure and sliding velocity. As the load increases, the lead screw assembly must slow down in order to prevent irreversible damage from frictional heat. Furthermore, a lead screw assembly with a polymer nut must reduce rpm as the load increases. The more speed, the lower the load capacity. But, the PV factor must be below the maximum allowed value of the material used to make the screw shaft.

The thread angle of a screw shaft

The angle between the axes of a thread and the helix of a thread is called the thread angle. A unified thread has a 60-degree angle in all directions. Screws can have either a tapped hole or a captive screw. The screw pitch is measured in millimeters (mm) and is usually equal to the screw major diameter. In most cases, the thread angle will be equal to 60-degrees.
Screws with different angles have various degrees of thread. Originally, this was a problem because of the inconsistency in the threading. However, Sellers’s thread was easier to manufacture and was soon adopted as a standard throughout the United States. The United States government began to adopt this thread standard in the mid-1800s, and several influential corporations in the railroad industry endorsed it. The resulting standard is called the United States Standard thread, and it became part of the ASA’s Vol. 1 publication.
There are two types of screw threads: coarse and fine. The latter is easier to tighten and achieves tension at lower torques. On the other hand, the coarse thread is deeper than the fine one, making it easier to apply torque to the screw. The thread angle of a screw shaft will vary from bolt to bolt, but they will both fit in the same screw. This makes it easier to select the correct screw.

The tapped hole (or nut) into which the screw fits

A screw can be re-threaded without having to replace it altogether. The process is different than that of a standard bolt, because it requires threading and tapping. The size of a screw is typically specified by its major and minor diameters, which is the inside distance between threads. The thread pitch, which is the distance between each thread, is also specified. Thread pitch is often expressed in threads per inch.
Screws and bolts have different thread pitches. A coarse thread has fewer threads per inch and a longer distance between threads. It is therefore larger in diameter and longer than the material it is screwed into. A coarse thread is often designated with an “A” or “B” letter. The latter is generally used in smaller-scale metalworking applications. The class of threading is called a “threaded hole” and is designated by a letter.
A tapped hole is often a complication. There is a wide range of variations between the sizes of threaded holes and nut threads, so the tapped hole is a critical dimension in many applications. However, even if you choose a threaded screw that meets the requisite tolerance, there may be a mismatch in the thread pitch. This can prevent the screw from freely rotating.

China Good quality Automatic Wastewater Treatment Volute Screw Press Sludge Dewatering Machine   supplier China Good quality Automatic Wastewater Treatment Volute Screw Press Sludge Dewatering Machine   supplier
editor by CX


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