Tag Archives: screw conveyor machine

China manufacturer Twin Screw PP PE PA PS Pet ABS PC Pelletizing Machine screw conveyor shaft alignment

Product Description

GS mach which is a manufacturing vendor, specializing in the twin screw extruder pelletizing line and spare parts, with high quality machine and competitive price.

Here are some of our hot sale production lines for your kind reference
1. PLA PBAT+ corn starch biodegradable pellets making line
2. PET bottle flakes recycling and pelletizing line
3. EVA hot melt adhesive pelletizing line
4. PP/PE/EVA etc.+CaCO3/Talc/TiO2 filler pelletizing line;
5. PE/PP/ABS/AS/PA/EVA/PET etc. color/white/black masterbatch pelletizing line
6. HDPE/LDPE/LLDPE/MDPE/EVA/PVC/PP etc. cable compounding line
 7. TPU/TPE/TPR/TPV thermoplastic elastomer pelletizing line
8. Glass/carbon fiber reinforced PA/PP/PBT/ABS/AS/PC/POM/PET etc.
9. Various twin Screw elements, screw barrels, side feeders, heaters, etc.

For more details about our machine specification and configuration, pls kindly contact us:
Looking forward to hearing back from you. We are always glad to be at your service.

Twin Screw Extruder Compound Machine

Machine Type Choice:


Composition of twin-screw compound machine:

Metering Feeder—Main Motor—Gear Box—Barrel—Screw Shaft—Soft Water Cooling System—Die Head–Cutting System

1. Twin-screw extruder with high-precision barrel and modular combination, lateral split, easy to change color
2. The segmented barrel body adopts the automatic control system of efficient heat exchange, non-solidification
3. Screw components can be freely combined according to technical requirements
4. Extruder twin screw, barrel and conveying parts are made of special alloy materials, making the machine more durable
5. Strong self-cleaning, strong shear force and high mixing efficiency
6. Gearbox is equipped with independent lubrication and cooling system, with high torque, low noise + 60DB, high wear resistance and long life
7. Twin-screw extruder adopts touch screen computer control system, safe operation


  1. Parallel co-rotating twin screw extruders have excellent mixing performance,good self cleaning performance and flexible modular configuration characteristics.
  1. The suitable for processing different types of material systems,and are extensively used in fields of polymer processing ,foodstuff  processing and chemical products, especially for various high molecular materials.
  1. In most cases ,parallel co-rotating twin screw extruders are used as mixing equipment.In processing high molecular materials,the modification process and master batch preparation of Polyolefin material and engineering plastics require sufficient and intensive mixing,which differs depending on material systems, Excellent equipment performance,reasonable mixing process, advanced combination technique and rich processing experience are the key factors determining the success and efficiency of mixing.

Processing Raw Material:

Color Masterbatch:
PE,PP,PS,ABS,EVA,PET+Pigment and additives

Filling & Modification:
PE,PP,PS,EVA+CaCO3,Talcum Powder,TiO2
PP,PA6,PA66.ABS+Ferrous Powder,Magnetic Powder,Ceramic Powder


Various Cable Material
HDPE, LDPE, LLDPE, MDPE insulating bush, cable shield
PE Six-XLPE cable compounds,PE chemical crosslink cable compounds,
PE radiation crosslinking cable compounds,H-cable compounds PVC wire&cable compounds;HFFR,Polyolefine cable compounds

Powder Coating
Polyester coating,Polyurethane coating,epoxy resin coating,Propyl
Coating;Pcrylic coating

Phenolic aldehyde+glass-fiber,Urea-formaldehyde,Compounds epoxide powder caoating,Potting material,etc
Varions of Thermosets with serial production

Functional Masterbatch
CB masterbatch:PE,PP,PS ABS,EVA… +carbon
Flame retardant masterbatch:PE,ABS,PA PBT…+flame retardant& additives Degradative masterbatch:PE,PS+Starch;PP+CaCO3,Talcum powder
Safeguard function masrerbatch:Masterbatch of hest insulator…

Glass Fiber(carbon fiber, wood fiber)Reinfcrsersen
PE,ABS,AS,PBT,PET,PA,PC+Carbon fiber
PP,ABS,AS,PBT,PET,PA,PC,PPO…+long glass fiber or short glass fiber

Different Types Cutting Systems: 

  • Water Strand Cutting System:water tank–dryer–pelletizer machine,
  • Hot Air Cutting System:hot face die head cutting–blower–first cyclone–second cyclone–vibrate screen-silo
  • Water Ring Cutting System:Water ring pelletizer–Centrifugal dehydrator–vibrating Screen–Cyclone Silo.

Underwater cutting system:Underwater pelletizer–Tempered Water System–By-pass pipes–Centrifugal Dehydrator.

1. PLA PBAT+ corn starch biodegradable pellets making line
2. PET bottle flakes recycling and pelletizing line
3. EVA hot melt adhesive pelletizing line
4. PP/PE/EVA etc.+CaCO3/Talc/TiO2 filler pelletizing line;
5. PE/PP/ABS/AS/PA/EVA/PET etc. color/white/black masterbatch pelletizing line
6. HDPE/LDPE/LLDPE/MDPE/EVA/PVC/PP etc. cable compounding line
 7. TPU/TPE/TPR/TPV thermoplastic elastomer pelletizing line
8. Glass/carbon fiber reinforced PA/PP/PBT/ABS/AS/PC/POM/PET etc.
9. Various twin Screw elements, screw barrels, side feeders, heaters, etc.
For more details about our machine specification and configuration, pls kindly contact us:
Looking forward to hearing back from you. We are always glad to be at your service.

After-sales Service: Yes
Warranty: 1 Year
Type: Sheet Extruder
Plastic Processed: PP
Product Type: Granulating Extruder
Feeding Mode: One Feed


Customized Request


Screw Shaft Types

If you’re looking for a screw shaft, but aren’t sure which type to buy, you’re in luck. In this article, we’ll talk about the different types, including Threaded shank, Round head, and Machined. Once you’ve read it, you’ll know which type to buy. Then, you can decide whether you want a ball screw nut or a threaded shank.

Machined screw shafts

Besides the standard stainless steel shaft, manufacturers also provide a variety of other materials, such as titanium, bronze, and brass. In addition to stainless steel, manufacturers also provide a variety of top-coating options, including zinc, brass, and chromium. Aluminum screws are not particularly durable and are easily affected by weather. Most screw shafts feature self-locking mechanisms. They are especially useful in C-clamps, vises, and screw-top container lids.
For applications where accuracy is vital, a ball screw shaft needs to be annealed. A heat treatment can be performed on the ball screw shaft to ensure that both ends are heated evenly. In this process, the shaft will be more durable, while maintaining its high-precision properties. These screw shafts are a key component in computer-controlled motion-control systems, wire bonding, and other industries that require high-precision and high-quality performance.
Depending on the material used, screw shafts can be made of stainless steel or titanium. High-precision CNC machines and lathes are typically used to manufacture screw shafts. Various shapes and sizes are available, each with a specific application. Whether you need a small or large screw, you can find one to fit your needs. And since each size requires a different material, your choice of material is important as well.
In general, the materials used for machining screw shafts are steel, stainless steel, titanium, brass, bronze, and aluminum. Metals that resist corrosion are also commonly used. Other materials for screw shafts are Teflon, nylon, and nylon. You can also find threaded screw shafts in materials such as porcelain, glass, and ceramic. If you want to use your screws in a unique material, consider purchasing a customized one.

Ball screw nuts

If you have a screw shaft, the last thing you want to worry about is the ball nut slipping off. To prevent this, you can place a temporary stop in the shaft’s grooves to ensure that the ball nut does not slide off. When you remove the stop, you can then install the ball screw nut. But, before you can install the ball screw nut, you have to make sure that you have a good grip on the shaft.
When selecting ball screw nuts, it’s important to consider how much preload you need to apply to avoid excessive backlash. Preloading eliminates this problem by making the ball nut compact. It also prevents backlash, which is lost motion caused by clearance between the ball and nut. Backlash disrupts repeatability and accuracy. This is where spacer preloading comes in. You can insert a spacer between the two ball nuts to transmit the force to the nut. However, you should keep in mind that this method reduces the load capacity of the ball screw.
The critical speed of a screw is the maximum rotating speed before it whips. This critical speed is influenced by several factors, including the diameter of the screw shaft, the number of support elements, and the material. By adjusting these factors, you can reduce the number of components used and the amount of time it takes to assemble the screw shaft. In addition, you can also reduce the number of components and avoid stacking tolerances. However, the critical speed of plastic nuts is limited due to sliding friction.
The ball screw nut has several characteristics that make it unique. Its most prominent feature is the presence of ball bearings. These balls help reduce friction between the screw nut and the shaft. Without ball bearings, the friction would be too high to function properly. Another important characteristic is the groove profile of the nut and ball. These two features ensure that the ball and the nut meet at two points. You’ll be amazed by the results of the work of these ball screw nuts.

Threaded shank

Wood screws are usually not fully threaded because the shank has an unthreaded portion at the top. This shoulder part forces the screw to compress two pieces of wood, which prevents the screw from overheating and compromising the materials strength. As the screw is threaded partially up, it is not as difficult to remove as a fully threaded screw. However, it is important to note that a wood screw will not hold as tightly as one with a fully threaded shank.
In addition to being universal, screw threads can be of different sizes. For example, a M8 screw has a thread pitch of 1.25 mm. To avoid confusion, screw thread pitches are commonly given with a multiplication sign. For example, M8x1 means that the screw is eight mm in diameter but has a thread pitch of one mm per 360-degree rotation. Those who are not familiar with these dimensions may find it confusing.
The OD of the threaded portion of a bolt is generally smaller than the OD of the nut. If the shank is too deep for the nut to fit, the threads may bottom out. This is why it’s important to use a thread-cutting bit with a small thread diameter. You can use a micrometer or caliper to measure the thread diameter. This tool will also allow you to easily identify which screw size fits where and how well.
The metric system is the most widely used. Fasteners with DIN numbers are generally metric in size. This makes them very useful for industrial settings. You can find metric-sized screws anywhere, as long as you buy them from a reputable manufacturer. These fasteners also come with a dog point, which is used for safety wire. If the screw needs to be replaced, the shank can be drilled with a hole for a safety wire or for a dog-point.

Round head

A round head screw is the most common type used for machine screws. Other common types include truss head, flat head, and hexed head. Each has a different profile and are used for different purposes. A round head screw is typically wider than a flat or a hexed head, and has a slightly rounded surface. These screws are useful for projects involving sheet metal or sheet-metal parts. Round heads are usually slightly wider than a hex head screw, and they may also be used as a substitute for washers in certain applications. However, truss heads are not necessary for every project.
A wood screw has a smooth shank that protrudes above the surface of the material it is attaching. A metal screw has a threaded shaft that is fully threaded from head to point, and a fully threaded shaft provides more bite. Two common head styles are round head and pan head. If the task requires the screw to be flush or countersunk, the round head will be the best choice.
Another type is the Reed & Prince screw drive. These are similar to Phillips screws but have a 75-degree V shape. They are commonly used in marine hardware and are also known as BNAE NFL22-070. This type is also used for steel plate hangers. In addition to round head and pan head screws, there are a variety of other screw types. You can even get a head with a slotted head if you know where to look.
Screw diameters are specified according to the ISO 261 or ISO 262 standards. An M8 screw has a diameter of 8.25 mm. The M8 screw has a pitch of 1.25 mm, which is equivalent to one mm per 360 degrees. There are several other standard screw sizes and thread diameters available. You can find them all by consulting the relevant standards. But remember, the metric system is the most popular.

Self-locking mechanism

A self-locking mechanism for a screw shaft is a device that secures the screw to its supporting member in a failure position. The locking mechanism provides a positive connection between the screw shaft and the control surface during normal operation, and locks the screw to its supporting member when the screw fails. Previous attempts to solve this problem have typically used secondary nuts with free play on the screw, which were intentionally designed to jam when loaded. However, such a device can be unreliable, which is why the present invention offers a more robust and reliable locking mechanism.
The self-locking function of a screw depends on several factors, including its pitch angle and the coefficient of friction of the threads. The angle of friction must be less than the tangent of the material pairing to prevent untightening of the screw. Screws with self-locking mechanisms have an efficiency e lower than 50%, which is less than half. Self-locking screws also have the benefit of being less efficient than a standard screw.
Unlike a normal screw, a self-locking screw can be turned in either direction. The nut 22 rotates with the screw shaft, and the member 23 is translated in an axial direction. Regardless of the direction of the rotation of the screw, this axial translation will result in the opposite moment to that input moment. While screw self-locking mechanisms are typically less expensive, they are more reliable and durable.
Another important feature of self-locking screws is that they are not susceptible to independent loosening. The screw cannot rotate without a certain amount of torque. In addition, a self-locking screw shaft must have a small wedge with a smaller half-angle than the arctangent of the static friction. This means that the torque applied by the driver must be greater than the torque needed to overcome the friction.

China manufacturer Twin Screw PP PE PA PS Pet ABS PC Pelletizing Machine   screw conveyor shaft alignmentChina manufacturer Twin Screw PP PE PA PS Pet ABS PC Pelletizing Machine   screw conveyor shaft alignment
editor by CX 2023-11-22

China Factory custom for cnc machine stepper motor clamp type helical beam Flexible shaft Coupling Coupler screw conveyor shaft

Warranty: 6 months
Applicable Industries: Hotels, Garment Shops, Building Material Shops, Manufacturing Plant, Machinery Repair Shops, Food & Beverage Factory, Farms, Home Use, Retail, Printing Shops, Construction works , Energy & Mining, Other, Advertising Company
Customized support: OEM, ODM
Flexible or Rigid: Flexible
Material: Aluminium alloy
Product name: Flexible shaft Coupling Coupler
Brand: AST.ZG
Keyword: Shaft coupling
Application:: Cnc Machines module,Ball screw,Stepper motor
Shaft size: 4,5,6, 6.35 ,7,8,9,10, PTO Slip Clutch, Male 1-38 x 6 Spline; Female 1-38 x 6 Spline 12,15,18,19,20,20 etc.
Type: Flexible Clamp Coupling
Body Material: Aluminum Alloy
Length: 21-50mm
Bore Diameter(d1~d2):: 3-25mm
Port: HangZhou

Products Description

Product name clamp type helical beam flexible coupling
Bore Diameter(d1-d2)3mm-20mm
Outer Diameter(D)15mm-50mm
Bore ToleranceISO standard H7
Keyway ToleranceDIN6885/1 JS9
MaterialAluminum Alloy, Steel, Stainless Steel, Iron, Metal, PVC
FeatureSmall dimension, low weight, high transmitted torque
FinishingAnodized, Black Oxide, Polished
AdvantageCompensating the axial relative drift, buffer and vibration reduction
Product Specification Packaging Company Profile Aisite Transmission technology Co., LTD. is a years experience manufacture in china specializing in research and development of linear guide, ball screw, Linear Module,shaft coupling,Bearing,and other CNC mashine parts .Products are widely used in automationequipment, placement machine, laminating machine, 0E 315571571 For BMW X3X4X5X6F15F25F26F16 front differential case (front drive axle) front teeth I=4113=3,15 automation Welding assembly equipment, instrumentation, medical equipment,printing equipment, precision machinery equipment, grinding machines, and automatic machinery equipment. Beside our AST.ZG Brand ,we offer OEM&ODM seravice for many brand in worldwide.Our Professional engineers and Designers team who can make products according to your all request , drawing or samples, our skilled and qualified QC can ensure the quality . With good quality products in reasonable price , punctual delivery , perfect after-sales service received lots of good feedback from the new market till now.we sincerely looking CZPT to cooperate with you . Why Choose Us1.Years experience , professional engineer and designer team 2.Small order acceptble with LOGO OEM .stock enough , delivery in time 3.Good quality products in reasonable price 4.Good feedbac and after service ,Sales teams 24hour online to help you . Production Process Testing Equipment FAQ Q1: Wonder if you accept small orders?A1: Do not worry. we accept small order.Q2: Can you make small order with customed LOGO ?A2: Yes, we can make your own logo print , even packege boxes with your company marks .Q3: Can you send products to my country Door to door ? A3: Sure, we can. If you do not have your own ship forwarder, we can help you. Q4: Can you do OEM for me?A4: We accept all OEM orders,just contact us and give me your design.we will offer you a reasonable price and make samples for you ASAP.Q5: What’s your payment terms ?A5: By T/T,LC AT SIGHT,30% deposit in advance, 5086666AB Front Right Axle Shaft for Dodge Ram Pickup 03-08 Driver Side Stub Axle Factory 4571735 balance 70% before shipment. Q6: How long is your production lead time?A6:It depends on product and order qty. Normally, it takes us 15 days for an order.


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 Factory custom for cnc machine stepper motor clamp type helical beam Flexible shaft Coupling Coupler     screw conveyor shaftChina Factory custom for cnc machine stepper motor clamp type helical beam Flexible shaft Coupling Coupler     screw conveyor shaft
editor by czh 2023-06-27