China Eccentric Screw pump Spare Parts Coupling Rod,Stator ,Rotor ,Drive shaft ,Boot, Retaining sleeve, Guide bush brass screw shaft

Warranty: 1 years
Customized support: OEM
Model Number: BN1-24
Pump Parts & Accessries: Pump shaft
NAME: Coupling Rod
Packaging Details: Carton packaging for a single product A number of products with wooden box packaging, each box does not exceed 30 kg
Port: FoShan City of China

The introduction of screw pump coupling rod
1.The connecting Rod Group consists of connecting rod, universal joint,coupling rod, guide bush, rubber rings, and a rubber sheath, connecting rod pin, retaining sleeve,steel wire rings, drive shaft, etc.

2 The connecting Rod Group is in addition to withstanding not only the force of drive shaft, but also to bear the force of its own swinging longitudinal and transverse, the size and direction of these forces are cyclical, so the connecting rods are subjected to alternating loads such as compression and stretching.The size and direction of these forces are cyclical, so the connecting rods are subjected to force of compression, stretching and so on.

3 The coupling rod must have sufficient fatigue strength and structural stiffness. If the fatigue strength is insufficient, it will lead to break the connecting rod body or connecting rod interface, and then produce the major accident whole machine damage.

4 If the rigidity of the connecting rod is not enough, it will cause the bending deformation of the rod body and the universal joint, resulting in the eccentric grinding of the coupling rod, guide bush, thecoupling rod bush, etc.

Function of connecting rod:
The connecting rod is used to connect the drive shaft and the rotor , and transmit the actuator force to the rotor, thus driving the rotor to rotate the motion. According to the requirements of the media, the joint shaft can be installed with a broken bridge aid flow device

Material of connecting rod:
The main damage form of the connecting rod is fatigue fracture and excessive deformation. Generally, the fatigue fracture area is 3 high stress areas on the connecting rod. The working condition of the connecting rod requires that the connecting rod has high strength and anti-fatigue performance, and it also requires sufficient rigidity and toughness. Traditionally, the materials used in the process of connecting rod are 304, 316L, 40Cr, 2Cr13, 2205, 904L and so on.

The material of coupling rod we commonly used :
SUS304 ; SUS316; 2Cr13, 40Cr, 2205 , 904L etc.

S T D factory availability
1)There are all kinds of accessories in the S T D’s factry, we offer a fast turnaround to help reduce the downtime of equipment, you don’ 3571 Single row tapered roller bearings 55x120x31.5 mm t need to have a lot of inventory.
2)For the spare parts, can be quickly shipped, to ensure that the production won’t be interrupted or reduced to the minimum downtime. With good service and very competitive price, customer can earn time an profit from the cooperation with us.

Highly competitive pricing
During customers become more and more focused on running and maintaining costs,in evaluating the conservation and efficiency of factory, we need to consider priority the price and supply capacity of spare parts.

STD company is using their engineering knowledgeand production capacity, is capable of producing excellent quality and price competitiveness spare parts ( the spare parts of NETZSCH, SPEEDEX, MONO ,VISCOTEC, STD etc. )

Quality Assurance
S T D is a professional R & D and manufacturer of single screw pump and the spare parts, product quality was inspected and approved by customers in professional market, has won customer’s recognition and highly praise.

S T D Universal Parts overview
S T D has a reputation for quality in both equipment and parts. Over recent years it has been our mission to use our manufacturing and engineering expertise to expand our product offering to include a range of high quality S T D Universal Parts, suitable for many other brands of progressing cavity (PC) pumps.
We provide S T D Universal Parts to be used with the following ranges of other brands of progressing cavity pumps. For others not listed, please contact S T D

International excellent brand screw pump parts supply
STD use their own expertise, manufacturing capabilities and channels to provide the world’s major brands (Germany’s Netzsch,Seepex, Mono,and so on) a full range of screw pump parts, these accessories performance is good, rugged, durable, including: stator, rotor, transmission shaft, joint shaft, PIN, PIN, or a complete set of rotating parts, etc.





1)What products does S T D offer ? STD offers screw pump, Screw pump accessories, and the global solution of the fluid system product.
The product range summary of STD
Progressive cavity pumps for conveying and metering low to highly viscous media with or without solids
Macerators for macerating CZPT and fibrous components in the medium
Control systems for monitoring, regulating and controlling processes
Services: consulting, commissioning, maintenance, H agricultural machinery spare parts harvesting implements clutch assemble loader clutch assemble 258mm clutch assemble CZPT ,SEEPEX, and MONO Universal Spare parts, repairs and various service contracts
2)Does S T D supply custom-made pumps ?
Yes, this is our specialty, we customize different design and material combinations for each application’s modular system. This means that we develop the best technology and the most economical solution for your needs.
3)Can S T D spare parts be ordered online ? Yes, S T D screw pumps and spare parts as well as other brands (NETZSCH,SEEPEX.MONO) Universal accessories can be ordered online. For order please contact us.
4)How fast can my S T D pump be delivered ?
Normally, standard pumps are delivered in 4 to 6 weeks. In urgent cases, delivery times between 2 to 5 days may be possible. Please contact us .Telephone: –
1) Standard export packing: We will pack pump and accessories in wooden boxes, put into container. shipmentby sea and air. .
2) The marks on the packing box are executed according to the international standard
3) Please check the packaging and integrity of goods when receiving them, Ifany damaged, please immediately report to the carrier.
4) Please kindly notice us if you have special packing requirements.
6)Product quality guarantee
According to the international standard, whole pump 1 year warranty,
Spare parts 6 months warranty

Buyers Attention:
1)Can screw pump dry running ?
No, the conveying elements are permanently in contact with 1 another, which means that dry running must be avoided in progressive cavity pumps. The S T D dry-running protection device offers reliable protection.
2)What temperatures is suitable for using S T D pump ? S T D progressive cavity pumps can be used at temperatures from -20 °C to 150° C (-4 to 302° F).

Company Introduction
ZheJiang Standard Fluid Systems Co., Ltd. the largest professional manufacturer in South China about : screw pump, screw valve, emptying system screw products
The screw pump, screw valve, emptying system screw products are advanced technology, perfect structure, various forms, complete specifications, durability, is widely used in sewage treatment, chemical industry, paper, food processing, pharmaceutical, energy, environmental protection, 3D printing and other industries.
The company has an experienced, mature technology, high-quality, reliable screw pump design, manufacturing, high quality fast shipping AC Servo Motor 1.2KW 110ST-M04030 4N.m 12WhatsApp: Wechat: Attn: Ms. June ZhangShowroom:

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 Eccentric Screw pump Spare Parts Coupling Rod,Stator ,Rotor ,Drive shaft ,Boot, Retaining sleeve, Guide bush     brass screw shaftChina Eccentric Screw pump Spare Parts Coupling Rod,Stator ,Rotor ,Drive shaft ,Boot, Retaining sleeve, Guide bush     brass screw shaft
editor by czh 2023-03-24