Tag Archives: rigid couplings

China Standard Flange Cast Iron Coupling Steel Universal Joint Cardan Pump Rubber Motor Disc Curved Tooth Flex Rigid Drive Shaft Nm Yox Fluid Jaw Flexible Chain Gear Couplings gear coupling

Product Description

 Flange Cast Iron Coupling Steel Universal Joint Cardan Pump Rubber Motor Disc CHINAMFG Flex Rigid Drive Shaft NM yox Fluid Jaw Flexible Chain Gear Couplings

Manufacturer of Couplings, Fluid Coupling, JAW Coupling, can interchange and replacement of lovejoy coupling and so on.

A coupling can interchange and replacement of lovejoy coupling is a device used to connect 2 shafts together at their ends for the purpose of transmitting power. The primary purpose of couplings is to join 2 pieces of rotating equipment while permitting some degree of misalignment or end movement or both. In a more general context, a coupling can also be a mechanical device that serves to connect the ends of adjacent parts or objects. Couplings do not normally allow disconnection of shafts during operation, however there are torque limiting couplings which can slip or disconnect when some torque limit is exceeded. Selection, installation and maintenance of couplings can lead to reduced maintenance time and maintenance cost.

 

Coupling is a jaw type coupling that works for a variety of light duty to heavy duty motors used in electric power transmission.

This is 1 of our safest types of products. The reason being that these couplings work even when the elastomer fails and there is no metal to metal contact.

They perform in well-standing oil, grease, moisture, sand, and dirt and nearly 850,000 bore combinations that can be customised as per the customer’s needs.

They are used in light-weight, medium, or heavy electrical motors and devices for power transmission through internal combustion.

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flange coupling

Selection of Gear Couplings for Specific Applications

Choosing the appropriate gear coupling for a specific application involves considering several factors to ensure optimal performance and reliability. Here are the key steps in the selection process:

  1. Identify Application Requirements: Understand the specific requirements of the application, including the torque and speed requirements, operating conditions, and the amount of angular and axial misalignment expected in the system.
  2. Calculate Torque and Speed: Determine the required torque and speed ratings for the gear coupling based on the power transmission needs of the application. Consider both peak and continuous torque requirements.
  3. Consider Misalignment: Evaluate the amount and type of misalignment that the gear coupling needs to accommodate. Different gear coupling designs have varying degrees of misalignment capabilities, so it’s essential to choose one that can handle the expected misalignment in the system.
  4. Check Space Constraints: Consider the available space for installing the gear coupling. Some applications may have limited space, requiring compact or specially designed couplings to fit properly.
  5. Assess Environmental Conditions: Determine if the application involves exposure to extreme temperatures, corrosive substances, or other harsh environmental factors. Select a gear coupling made from materials that can withstand the specific environmental conditions.
  6. Consider Maintenance Requirements: Evaluate the maintenance needs of the gear coupling. Some designs may require more frequent maintenance than others. For applications where regular maintenance is challenging, consider maintenance-free gear coupling options.
  7. Check Industry Standards and Certifications: Ensure that the selected gear coupling meets relevant industry standards and certifications to guarantee quality and safety.
  8. Consult with Experts: If needed, seek guidance from coupling manufacturers or engineering experts who can provide valuable insights and recommendations based on their experience and expertise.

By carefully considering these factors and understanding the specific demands of the application, you can select the most suitable gear coupling that will provide reliable and efficient power transmission while minimizing the risk of premature failure or downtime.

China Standard Flange Cast Iron Coupling Steel Universal Joint Cardan Pump Rubber Motor Disc Curved Tooth Flex Rigid Drive Shaft Nm Yox Fluid Jaw Flexible Chain Gear Couplings  gear couplingChina Standard Flange Cast Iron Coupling Steel Universal Joint Cardan Pump Rubber Motor Disc Curved Tooth Flex Rigid Drive Shaft Nm Yox Fluid Jaw Flexible Chain Gear Couplings  gear coupling
editor by CX 2023-10-03

China supplier Flange Cast Iron Coupling Steel Universal Joint Cardan Pump Rubber Motor Disc Curved Tooth Flex Rigid Drive Shaft Nm Yox Fluid Jaw Flexible Chain Gear Couplings gear coupling

Product Description

 Flange Cast Iron Coupling Steel Universal Joint Cardan Pump Rubber Motor Disc CZPT Flex Rigid Drive Shaft NM yox Fluid Jaw Flexible Chain Gear Couplings

Manufacturer of Couplings, Fluid Coupling, JAW Coupling, can interchange and replacement of lovejoy coupling and so on.

A coupling can interchange and replacement of lovejoy coupling is a device used to connect 2 shafts together at their ends for the purpose of transmitting power. The primary purpose of couplings is to join 2 pieces of rotating equipment while permitting some degree of misalignment or end movement or both. In a more general context, a coupling can also be a mechanical device that serves to connect the ends of adjacent parts or objects. Couplings do not normally allow disconnection of shafts during operation, however there are torque limiting couplings which can slip or disconnect when some torque limit is exceeded. Selection, installation and maintenance of couplings can lead to reduced maintenance time and maintenance cost.

 

Coupling is a jaw type coupling that works for a variety of light duty to heavy duty motors used in electric power transmission.

This is 1 of our safest types of products. The reason being that these couplings work even when the elastomer fails and there is no metal to metal contact.

They perform in well-standing oil, grease, moisture, sand, and dirt and nearly 850,000 bore combinations that can be customised as per the customer’s needs.

They are used in light-weight, medium, or heavy electrical motors and devices for power transmission through internal combustion.

Production workshop:
Company information:

flange coupling

What Industries Commonly Use Gear Couplings for Power Transmission?

Gear couplings are widely used in various industries for power transmission due to their ability to transmit high torque loads and accommodate misalignments. Some of the industries that commonly utilize gear couplings include:

  • Steel Industry: Gear couplings are extensively used in the steel industry for connecting heavy-duty equipment like rolling mills, continuous casting machines, and other steel processing machinery.
  • Mining and Quarrying: In mining and quarrying applications, gear couplings are employed to transmit power in conveyor systems, crushers, and heavy excavating machinery.
  • Pulp and Paper: The pulp and paper industry uses gear couplings in machines like paper mills, pulp refiners, and stock preparation equipment.
  • Marine: Gear couplings are utilized in marine propulsion systems, providing a reliable connection between the engine and the propeller shafts.
  • Oil and Gas: Gear couplings find use in the oil and gas industry for connecting pumps, compressors, and other equipment used in upstream and downstream operations.
  • Power Generation: Gear couplings are employed in power plants to connect generators, turbines, and other rotating equipment.
  • Automotive: Gear couplings are used in automotive applications, particularly in heavy-duty vehicles and machinery like off-road vehicles, construction equipment, and agricultural machinery.
  • Chemical and Petrochemical: In chemical processing plants, gear couplings are employed in agitators, mixers, and various equipment where power transmission is crucial.
  • Cement and Aggregate: Gear couplings are used in cement plants and aggregate processing equipment for power transmission in crushers, kilns, and conveyors.

These are just a few examples, and gear couplings can be found in various other industries where reliable power transmission is essential. Their robust design and ability to withstand harsh operating conditions make them a popular choice for heavy-duty applications across different sectors.

China supplier Flange Cast Iron Coupling Steel Universal Joint Cardan Pump Rubber Motor Disc Curved Tooth Flex Rigid Drive Shaft Nm Yox Fluid Jaw Flexible Chain Gear Couplings  gear couplingChina supplier Flange Cast Iron Coupling Steel Universal Joint Cardan Pump Rubber Motor Disc Curved Tooth Flex Rigid Drive Shaft Nm Yox Fluid Jaw Flexible Chain Gear Couplings  gear coupling
editor by CX 2023-08-31

China high quality Rigidity Shaft High-Precision Couplings Rigid Coupling for Auto Parts coupling element

Product Description

Product Description:
Coupling is used to link the 2 different organizations shaft (driving shaft and driven shaft) to rotate to common transmission torque of mechanical parts.The overloaded power transmission at high speed, some coupling and buffer, vibration and enhance the role of shaft system dynamic performance.Coupling consists of 2 parts, respectively, and the driving shaft and driven shaft connection.

Brand SHAC
Raw material Aluminum
Inner Diameter 4-60MM
Length 25-140MM
Model number JM1,JM2,JDM,JM-T,JH,TM1/TM2/TM3/TM4,JB,JG,JT
Packing Plastic bag+inner box.According to customer’s request
Sample Free sample and catalogue available
Certification ISO 9001 , ISO 14001 , ISO 14000
Application CNC machines, medical and food machinery, fitness machinery, packaging machinery, printing machinery, and other machinery supporting equipment. 



Service:
1,Our Team:
We have experienced and qualified team of marketing and sales representatives to serve our valued customers with the finest products and unsurpassed service.And have professional engineers team to assessment and development the new precision products,and make the OEM customized more easily,experienced QC team to test the products quaity ensure the goods quality before delivery out.
2,Our products:
Quality is the life .We use only the best quality material to ensure the precision of our
Product.All products we sold out are strictly selected and tested by our QC department.
3,Payment:
We accept payment via TT (Bank transfer), L/C,Western Union.
4,Shipping method:
Including DHL, UPS, TNT, FEDEX,EMS, Airfreight and by Sea,as customer required.

Standard Or Nonstandard: Standard
Shaft Hole: Different Size as Requirement
Torque: More Than 10n.M
Bore Diameter: 4mm~60mm,Different Size with Different
Speed: Different Size Maximum Rpm Different as Standard
Structure: Flexible
Samples:
US$ 0/Piece
1 Piece(Min.Order)

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Request Sample

Customization:
Available

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Customized Request

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Types of Couplings

A coupling is a device used to join two shafts together and transmit power. Its purpose is to join rotating equipment while permitting a degree of end movement and misalignment. There are many types of couplings, and it is important to choose the right one for your application. Here are a few examples of couplings.

Mechanical

The mechanical coupling is an important component in power transmission systems. These couplings come in various forms and can be used in different types of applications. They can be flexible or rigid and operate in compression or shear. In some cases, they are permanently attached to the shaft, while in other cases, they are removable for service.
The simplest type of mechanical coupling is the sleeve coupling. It consists of a cylindrical sleeve with an internal diameter equal to the diameter of the shafts. The sleeve is connected to the shafts by a key that restricts their relative motion and prevents slippage. A few sleeve couplings also have threaded holes to prevent axial movement. This type of coupling is typically used for medium to light-duty torque.
Another type of mechanical coupling is a jaw coupling. It is used in motion control and general low-power transmission applications. This type of coupling does not require lubrication and is capable of accommodating angular misalignment. Unlike other types of couplings, the jaw coupling uses two hubs with intermeshing jaws. The jaw coupling’s spider is typically made of copper alloys. In addition, it is suitable for shock and vibration loads.
Mechanical couplings can be made from a variety of materials. One popular choice is rubber. The material can be natural or chloroprene. These materials are flexible and can tolerate slight misalignment.

Electrical

Electrical coupling is the process in which a single electrical signal is transferred from a nerve cell to another. It occurs when electrical signals from two nerve cells interact with each other in a way similar to haptic transmission. This type of coupling can occur on its own or in combination with electrotonic coupling in gap junctions.
Electrical coupling is often associated with oscillatory behavior of neurons. The mechanism of electrical coupling is complex and is studied mathematically to understand its effect on oscillatory neuron networks. For example, electrical coupling can increase or decrease the frequency of an oscillator, depending on the state of the neuron coupled to it.
The site of coupling is usually the junction of opposing cell membranes. The cellular resistance and the coupling resistance are measured in voltage-clamp experiments. This type of coupling has a specific resistance of 100 O-cm. As a result, the coupling resistance varies with the frequency.
The authors of this study noted that electrotonic coupling depends on the ratio between the resistance of the nonjunctional membranes and the junctional membranes. The voltage attenuation technique helps reveal the differences in resistance and shunting through the intercellular medium. However, it is unclear whether electrotonic coupling is electrostatically mediated.
Electrical coupling has also been suggested to play a role in the intercellular transfer of information. There are many examples that support this theory. A message can be a distinct qualitative or quantitative signal, which results in a gradient in the cells. Although gap junctions are absent at many embryonic interaction sites, increasing evidence suggests a role in information transfer.

Flexible

When it comes to choosing the right Flexible Coupling, there are several factors that you should take into account. Among these factors is the backlash that can be caused by the movement of the coupling. The reason for this problem is the fact that couplings that do not have anti-fungal properties can be easily infected by mold. The best way to avoid this is to pay attention to the moisture content of the area where you are installing the coupling. By following these guidelines, you can ensure the best possible installation.
To ensure that you are getting the most out of your flexible couplings, you must consider their characteristics and how easy they are to install, assemble, and maintain. You should also look for elements that are field-replaceable. Another important factor is the coupling’s torsional rigidity. It should also be able to handle reactionary loads caused by misalignment.
Flexible couplings come in many different types. There are diaphragm and spiral couplings. These couplings allow for axial motion, angular misalignment, and parallel offset. They have one-piece construction and are made from stainless steel or aluminum. These couplings also offer high torsional stiffness, which is beneficial for applications requiring high torques.
Flexible couplings have several advantages over their rigid counterparts. They are designed to handle misalignments of up to seven degrees and 0.025 inches. These characteristics are important in motion control applications. Flexible couplings are also inexpensive, and they do not require maintenance.
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Beam

A beam coupling is a type of mechanical coupling, usually one solid piece, that connects two mechanical parts. Its performance is largely determined by the material used. Typical materials include stainless steel, aluminum, Delrin, and titanium. The beam coupling is rated for different speeds and torques. The coupling should be selected according to the application. In addition to the material, the application should also consider the speed and torque of the system.
There are two main types of beam couplings. The first is the helical beam coupling, which has a continuous multi spiral cut. This type of coupling offers a high degree of flexibility and compensates for a high degree of misalignment. The second type of beam coupling is the helical shaft coupling, which has a low torsional stiffness, which makes it ideal for small torque applications.
Another type of beam coupling is the multiple beam design, which combines two beams. It allows for more tolerance in manufacturing and installation and protects expensive components from excessive bearing loads. It also helps keep beams shorter than a single beam coupling. This type of coupling also enables a higher torque capacity and torsional stiffness.
Beam couplings can be manufactured with different materials, including stainless steel and aluminum. The “A” series is available in aluminum and stainless steel and is ideal for general-purpose and light-duty applications. It is also economical and durable. This type of coupling can also be used with low torque pumps or encoder/resolver systems.

Pin & bush

The Pin & bush coupling is a versatile, general-purpose coupling with high tensile bolts and rubber bushes. It can tolerate a wide range of operating temperatures and is suitable for use in oil and water-resistance applications. Its unique design enables it to be used in either direction. In addition, it requires no lubrication.
The pin bush coupling is a fail-safe coupling with a long service life and is used for high-torque applications. It provides torsional flexibility and dampens shocks, making it a flexible coupling that protects equipment and reduces maintenance costs. Its hubs are forged from graded cast iron for strength and durability. Besides, the coupling’s elastomer elements reduce vibration and impact loads. It also accommodates a misalignment of up to 0.5 degrees.
Pin & bush couplings are a popular choice for a variety of different applications. This coupling features a protective flange design that protects the coupling flange from wear and tear. The coupling nut is secured to one flange, while a rubber or leather bush sits between the other flange. Its unique design makes it ideal for use in applications where misalignment is a small factor. The rubber bushing also helps absorb vibration and shock.
gearbox

Mesh tooth

Mesh tooth couplings are used to transfer torque between two shafts and reduce backlash. However, mesh tooth couplings have some limitations. One disadvantage is the break-away friction factor in the axial direction. This problem is caused by the high contact force between the tooth and gear mesh. This can cause unpredictable forces on the shafts.
In this paper, we present a FEM model for mesh tooth coupling. We first validate the mesh density. To do so, we compute the bolt stress as a uniaxial tensile during the tightening process. We used different mesh sizes and mesh density to validate our results.
The mesh stiffness of gear pairs is influenced by lead crown relief and misalignment. For example, if one tooth is positioned too far in the axis, the mesh stiffness will be decreased. A misaligned gear pair will lose torque capacity. A mesh tooth coupling can be lubricated with oil.
An ideal mesh tooth coupling has no gaps between the teeth, which reduces the risk of uneven wear. The coupling’s quality exposed fasteners include SAE Grade 5 bolts. It also offers corrosion resistance. The couplings are compatible with industrial environments. They also eliminate the need for selective assembly in sleeve couplings.
China high quality Rigidity Shaft High-Precision Couplings Rigid Coupling for Auto Parts   coupling elementChina high quality Rigidity Shaft High-Precision Couplings Rigid Coupling for Auto Parts   coupling element
editor by CX 2023-05-18

China Rigid Chain Couplings for Mechanical Couplings with Best Sales

Merchandise Description

Chain Coupling Selection
 

In general, the torque capacity of the coupling exceeds the normal torque transmitted by the biggest shaft size that the coupling can accommodate.

 

As a result, choose the smallest coupling which accommodates both shaft diameters.

 

Exactly where there is reverse procedure, shock masses, or any other severe operating problem, it is advisable that the subsequent coupling size up is chosen.

 

Procedure
 

In order to ensure that the highest support life of the coupling is accomplished, the go over collectively with the equipped ‘O’ rings should always be used. This is even much more important when the push is operating at substantial speeds or in a moist environment. The space between the protect and chain, should be stuffed with a delicate to medium consistency grease.

ZheJiang Shine Transmission Machinery Co., Ltd is specialized in producing and offering transmission products. Our goods are exported to the world well-known machinery organization in Europe, The usa, South Africa, Australia, Southeast Asia and many others.

Our primary goods incorporate: European pulley, American pulley, Couplings, taper bushing, QD bush, lock factor, adjustable motor base, motor rail, sprockets, chain, bolt on hubs, weld on hubs, jaw crusher tools & spare areas and all varieties of non-standard casting items and so forth.

Size Range: 3012-12022
Bore Size of Hubs: Pilot Bore or Finished
Surface Treatment: Black Oxide or Made to Order
Material of Cover: Structure: Flanges Flexible or Rigid: Rigid Stand
Color: Orange
Transport Package: Plywood Case

###

Customization:
Size Range: 3012-12022
Bore Size of Hubs: Pilot Bore or Finished
Surface Treatment: Black Oxide or Made to Order
Material of Cover: Structure: Flanges Flexible or Rigid: Rigid Stand
Color: Orange
Transport Package: Plywood Case

###

Customization:

Types of Coupling

A coupling is a device used to join two shafts together and transmit power. Its primary function is to join rotating equipment and allows for some end movement and misalignment. This article discusses different types of coupling, including Magnetic coupling and Shaft coupling. This article also includes information on Overload safety mechanical coupling.

Flexible beam coupling

Flexible beam couplings are universal joints that can deal with shafts that are offset or at an angle. They consist of a tube with couplings at both ends and a thin, flexible helix in the middle. This makes them suitable for use in a variety of applications, from motion control in robotics to attaching encoders to shafts.
These couplings are made of one-piece materials and are often made of stainless steel or aluminium alloy. However, they can also be made of acetal or titanium. While titanium and acetal are less common materials, they are still suitable for high-torque applications. For more information about beam couplings, contact CZPT Components.
Flexible beam couplings come in a variety of types and sizes. W series couplings are good for general purpose applications and are relatively economical. Stainless steel versions have increased torque capacity and torsional stiffness. Flexible beam couplings made of aluminum are ideal for servo and reverse motion. They are also available with metric dimensions.
Flexible beam couplings are made of aluminum alloy or stainless steel. Their patented slot pattern provides low bearing load and high torsional rigidity. They have a long operational life. They also require zero maintenance and can handle angular offset. Their advantages outweigh the disadvantages of traditional beam couplings.
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Magnetic coupling

Magnetic coupling transfers torque from one shaft to another using a magnetic field. These couplings can be used on various types of machinery. These types of transmissions are very useful in many situations, especially when you need to move large amounts of weight. The magnetic field is also very effective at reducing friction between the two shafts, which can be extremely helpful if you’re moving heavy items or machinery.
Different magnetic couplings can transmit forces either linearly or rotated. Different magnetic couplings have different topologies and can be made to transmit force in various geometric configurations. Some of these types of couplings are based on different types of materials. For example, a ceramic magnetic material can be used for applications requiring high temperature resistance.
Hybrid couplings are also available. They have a hybrid design, which allows them to operate in either an asynchronous or synchronous mode. Hysterloy is an alloy that is easily magnetized and is used in synchronous couplings. A synchronous magnetic coupling produces a coupled magnetic circuit.
Magnetic coupling is a key factor in many physical processes. In a crystal, molecules exhibit different magnetic properties, depending on their atomic configuration. Consequently, different configurations produce different amounts of magnetic coupling. The type of magnetic coupling a molecule exhibits depends on the exchange parameter Kij. This exchange parameter is calculated by using quantum chemical methods.
Magnetic couplings are most commonly used in fluid transfer pump applications, where the drive shaft is hermetically separated from the fluid. Magnetic couplings also help prevent the transmission of vibration and axial or radial loads through the drive shaft. Moreover, they don’t require external power sources, since they use permanent magnets.

Shaft coupling

A shaft coupling is a mechanical device that connects two shafts. The coupling is designed to transmit full power from one shaft to the other, while keeping the shafts in perfect alignment. It should also reduce transmission of shock loads. Ideally, the coupling should be easy to connect and maintain alignment. It should also be free of projecting parts.
The shaft couplings that are used in machines are typically made of two types: universal coupling and CZPT coupling. CZPT couplings are designed to correct for lateral misalignment and are composed of two flanges with tongues and slots. They are usually fitted with pins. The T1 tongue is fitted into flange A, while the T2 tongue fits into flange B.
Another type of shaft coupling is known as a “sliced” coupling. This type of coupling compensates for inevitable shaft misalignments and provides high torque. Machined slits in the coupling’s outer shell help it achieve high torsional stiffness and excellent flexibility. The design allows for varying engagement angles, making it ideal for many different applications.
A shaft coupling is an important component of any machine. Proper alignment of the two shafts is vital to avoid machine breakdowns. If the shafts are misaligned, extra force can be placed on other parts of the machine, causing vibration, noise, and damage to the components. A good coupling should be easy to connect and should ensure precise alignment of the shaft. Ideally, it should also have no projecting parts.
Shaft couplings are designed to tolerate a certain amount of backlash, but it must be within a system’s threshold. Any angular movement of the shaft beyond this angle is considered excessive backlash. Excessive backlash results in excessive wear, stress, and breakage, and may also cause inaccurate alignment readings. It is therefore imperative to reduce backlash before the shaft alignment process.
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Overload safety mechanical coupling

Overload safety mechanical couplings are devices that automatically disengage when the torque applied to them exceeds a specified limit. They are an efficient way to protect machinery and reduce the downtime associated with repairing damaged machinery. The advantage of overload couplings is their fast reaction time and ease of installation.
Overload safety mechanical couplings can be used in a wide range of applications. Their automatic coupling mechanisms can be used on any face or edge. In addition, they can be genderless, incorporating both male and female coupling features into a single mechanism. This means that they are both safe and gender-neutral.
Overload safety couplings protect rotating power transmission components from overloads. Overload protection devices are installed on electric motors to cut off power if the current exceeds a certain limit. Likewise, fluid couplings in conveyors are equipped with melting plug elements that allow the fluid to escape when the system becomes too hot. Mechanical force transmission devices, such as shear bolts, are designed with overload protection in mind.
A common design of an overload safety mechanical coupling consists of two or more arms and hubs separated by a plastic spider. Each coupling body has a set torque threshold. Exceeding this threshold may damage the spider or damage the jaws. In addition, the spider tends to dampen vibration and absorb axial extension. This coupling style is nearly backlash free, electrically isolating, and can tolerate very little parallel misalignment.
A mechanical coupling may also be a universal joint or jaw-clutch coupling. Its basic function is to connect the driver and driven shafts, and limits torque transfer. These devices are typically used in heavy-duty industries, such as steel plants and rolling mills. They also work well with industrial conveyor systems.
gearbox

CZPT Pulley

The CZPT Pulley coupling family offers a comprehensive range of couplings for motors of all types. Not only does this range include standard motor couplings, but also servo couplings, which require ultra-precise control. CZPT Pulley couplings are also suitable for engine applications where high shocks and vibrations are encountered.
CZPT Pulley couplings have a “sliced” body structure, which allows for excellent torsional stiffness and strength. They are corrosion-resistant and can withstand high rotational speeds. The couplings’ design also ensures accurate shaft rotation while limiting shaft misalignment.
CZPT Pulley has introduced the CPU Pin Type couplings, which are effective at damping vibration and maintain zero backlash. They are also made from aluminum and are capable of absorbing heat. They come with recessed tightening screws. They can handle speeds up to 4,000 RPM, and are RoHS-compliant.
China Rigid Chain Couplings for Mechanical Couplings     with Best Sales China Rigid Chain Couplings for Mechanical Couplings     with Best Sales
editor by czh 2023-01-02