Fabricant chinois de pièces mécaniques à haute résistance, poulie forgée, poulie de courroie de distribution, poulie d'entraînement, poulie à rainure pour grue à conteneurs avec les meilleures ventes

Description du produit

Forged Pulley

Description du produit

ZJD can provide the Pulley according to customers technical specifications.

Nos avantages

Application

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Profil de l'entreprise

ZJD is located in Xihu (West Lake) Dis. Economic Development Zone, Xihu (West Lake) Dis. District, HangZhou, ZheJiang , which has very good transportation convenience and location advantages.ZJD own 1 subsidiary, which is located in HangZhou city, ZheJiang province, which is mainly responsible for EMU accessories for CRRC's factory nearby.
ZJD's production and office space is more than 12,000 square meters, and more than 60 sets of various types of CNC machining and quality control equipment.ZJD's main products are widely used in CHINAMFG CR400, CR300, CR200 series standard EMUs, and expanded to subways, export passenger cars and EMUs and other products.
ZJD has more than 60 employees and more than 20 technical management personnel. The technical management team has many years of working experience in the rail transit industry. 

Certifications

ZJD has obtained the national high-tech enterprise certification, 6 types of products have passed the high-tech certification, and related products have obtained more than 20 patents. 
ZJD has established a comprehensive quality management system and has got ISO9001 quality management system certification, ISO/TS 22163 (IRIS) international railway industry standard certification, EN15085-2 railway vehicles welding system certification, and CHINAMFG product supply service qualification certification. 

FAQ

1. Who are we?

HangZhou ZJD Rail Equipment Co.,Ltd. was established in 2012, which is a professional manufacturer of rail equipment and accessories.

2. Are you a reliable supplier?
ZJD-Excellent Manufacturer focusing on the rolling stock industry
Provide full-process Design, Production, Testing and Service according to customer requirements.

3.What can you buy from us?
We have designed and supplied a series of products such an air duct systems, piping systerms, pneumatic control units,etc.The product are used in various fields such an EMUs,subways,locomotives,wagon engineering vehicles,etc. 

4. What services can we provide?
Provide customized services of heavy industry products for special requirements.
Provide diversified parts and trade services such as port machinery, steel heavy industry, mining machinery, etc.
Provide customized products for new energy equipment
Provide key process technology solutions for special parts in the field of new energy equipment.

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What are the applications of pulleys in the automotive industry?

Pulleys have various applications in the automotive industry, contributing to the operation of different systems within vehicles. Here are some common applications of pulleys in the automotive industry:

1. Engine Systems: Pulleys are extensively used in the engine systems of vehicles. The crankshaft pulley, also known as the harmonic balancer, is connected to the engine crankshaft and drives various engine accessories through the use of belts. These accessories may include the alternator, power steering pump, water pump, air conditioning compressor, and more. The rotation of the crankshaft pulley powers these accessories, allowing them to perform their respective functions.

2. Serpentine Belt Systems: Modern vehicles often use a serpentine belt system, which is a single, long belt that drives multiple engine accessories simultaneously. The serpentine belt travels around various pulleys, including the crankshaft pulley, tensioner pulley, idler pulleys, and accessory pulleys. These pulleys guide and maintain the tension of the serpentine belt, ensuring efficient power transfer to the engine accessories.

3. Timing Belt/Chain Systems: Timing belts or chains are used in internal combustion engines to synchronize the opening and closing of engine valves with the movement of the pistons. Pulleys known as timing belt pulleys or timing sprockets are mounted on the camshafts and crankshafts, and they work together with the timing belt or chain to ensure precise valve timing. These pulleys play a crucial role in maintaining engine performance and preventing valve interference.

4. Supercharger/Blower Systems: Pulleys are integral components in supercharger or blower systems used in performance vehicles. These systems compress the incoming air to increase engine power and performance. The pulley on the supercharger or blower is driven by the engine crankshaft pulley through a belt or a drive system. By changing the size of the pulley, the speed and boost level of the supercharger or blower can be adjusted.

5. Tensioners and Idler Pulleys: Tensioners and idler pulleys are crucial in maintaining proper belt tension and alignment in automotive systems. Tensioner pulleys are designed to apply tension to belts, ensuring they remain properly seated on the pulleys throughout their operation. Idler pulleys guide the belt and help maintain its alignment. These pulleys contribute to the smooth and reliable operation of various belt-driven systems, reducing slippage and preventing premature belt wear.

6. Accessories and Auxiliary Systems: Pulleys are also employed in various auxiliary systems and accessories in vehicles. These may include systems such as power windows, windshield wipers, cooling fans, and more. Pulleys in these systems facilitate the transfer of rotational motion from motors to mechanical components, enabling the desired functionality.

Overall, pulleys play significant roles in the automotive industry by driving engine accessories, maintaining belt tension, synchronizing engine timing, enhancing performance, and supporting various auxiliary systems. Their proper functioning is crucial for the reliable and efficient operation of automotive systems and components.

What role do pulleys play in modern elevators and hoists?

Pulleys play a crucial role in modern elevators and hoists, enabling the smooth and efficient vertical movement of loads. They are integral components of the lifting mechanisms, providing mechanical advantage and facilitating safe and controlled operation. Here's how pulleys are used in modern elevators and hoists:

1. Lifting Mechanism: In elevators and hoists, pulleys are part of the lifting mechanism that moves the load vertically. They are typically combined with cables, ropes, or belts to create a pulley system. By distributing the load's weight across multiple lines and changing the direction of the applied force, pulleys make it easier to lift heavy loads. The number and arrangement of pulleys can vary depending on the specific design and requirements of the elevator or hoist.

2. Counterweight Systems: Modern elevators often utilize counterweight systems to offset the weight of the elevator car and reduce the amount of power required for operation. Pulleys play a crucial role in these systems by guiding the cables connected to the counterweight. As the elevator car moves up or down, the counterweight moves in the opposite direction, balancing the load. The pulleys in the counterweight system help distribute the weight and ensure smooth movement.

3. Traction Control: Pulleys are also involved in the traction control mechanism of elevators and hoists. Traction elevators use ropes or belts that pass over a series of pulleys, known as sheaves, to create traction. An electric motor drives the sheaves, causing the ropes or belts to move. By adjusting the rotational movement of the sheaves, the speed and direction of the elevator or hoist can be controlled. The pulleys in the traction control system enable precise and reliable operation.

4. Safety Systems: Pulleys play a crucial role in the safety systems of elevators and hoists. For example, in traction elevator systems, overspeed governors utilize pulleys to detect excessive speed and activate the safety brakes in case of a malfunction. The pulleys in these safety systems help monitor and control the elevator's speed, ensuring passenger safety.

5. Maintenance and Service: Pulleys in modern elevators and hoists are designed to be durable and require minimal maintenance. They are often equipped with sealed bearings or other lubrication systems to reduce friction and wear. This ensures the longevity and reliability of the pulley systems, minimizing downtime and maintenance costs.

Overall, pulleys are essential components in modern elevators and hoists, enabling vertical movement, providing mechanical advantage, ensuring safety, and facilitating efficient operation. They contribute to the smooth and controlled lifting of loads, making elevators and hoists reliable and indispensable tools in various industries and buildings.

Quelle est la différence entre une poulie fixe et une poulie mobile ?

Une poulie fixe et une poulie mobile sont deux types de poulies distincts qui diffèrent par leur conception et leur fonctionnalité. Voici une explication détaillée de leurs différences :

1. Conception et fixation : une poulie fixe est fixée à une structure stationnaire, comme un plafond ou un mur, à l'aide d'un support de montage ou d'un autre moyen. Elle reste fixe en place et ne bouge pas pendant le fonctionnement. En revanche, une poulie mobile est fixée à la charge déplacée et se déplace avec elle. Elle est généralement suspendue par une corde ou un câble et peut se déplacer librement de haut en bas.

2. Avantage mécanique : En ce qui concerne l'avantage mécanique, une poulie fixe n'offre aucun avantage. Elle modifie la direction de la force appliquée mais ne réduit pas l'effort nécessaire pour soulever la charge. En revanche, une poulie mobile offre un avantage mécanique en réduisant l'effort nécessaire pour soulever la charge. Elle répartit la charge entre les segments de câble attachés à la poulie mobile et au point fixe, ce qui facilite le levage d'objets lourds.

3. Répartition de la force : dans une poulie fixe, la force appliquée à une extrémité de la corde ou de la courroie est redirigée pour changer la direction de la force. La charge est soulevée en tirant sur l'extrémité opposée de la corde. Dans ce cas, la force requise pour soulever la charge est égale au poids de la charge elle-même. Dans une poulie mobile, la charge est attachée à la poulie mobile elle-même. La force requise pour soulever la charge est réduite car le poids de la charge est réparti entre les segments de corde attachés à la poulie mobile et au point fixe.

4. Changement de direction : les poulies fixes et mobiles sont capables de changer la direction de la force appliquée. Cependant, la fonction principale d'une poulie fixe est de changer la direction de la force, tandis qu'une poulie mobile combine le changement de direction de la force avec un avantage mécanique. La poulie mobile permet à l'opérateur d'exercer une force dans une direction plus pratique tout en nécessitant moins d'effort pour soulever la charge.

5. Applications : Les poulies fixes sont couramment utilisées en combinaison avec d'autres poulies pour créer des systèmes plus complexes, tels que des agencements de palans. Elles sont souvent utilisées dans des scénarios où l'objectif principal est de changer la direction de la force. Les poulies mobiles, en revanche, sont fréquemment utilisées dans des systèmes qui nécessitent un avantage mécanique ou une réduction de l'effort nécessaire pour soulever des objets lourds. On les retrouve souvent dans des applications telles que les systèmes de levage, les grues et les ascenseurs.

Globalement, les principales différences entre une poulie fixe et une poulie mobile résident dans leur conception, leur avantage mécanique, la répartition de la force et leurs applications. Alors qu'une poulie fixe modifie principalement la direction de la force, une poulie mobile combine le changement de direction de la force avec un avantage mécanique, ce qui facilite le levage de charges lourdes.

éditeur par CX