Product Description

Our products include  Rigging hardware ,G80 & G100 rigging,Synthetic lifting sling & harness,Cargo control & Transport products ,Chains & Wire Rope Accessories,Stainless steel rigging,hoist & lifting equipment,marine hardware
 

 Heavy Duty Pulley Snatch Block with Pulley Double Wheels

1. Working Load Limited: 1T to 32T;

2. The Dia of steel wire rope to the pulley block is from 6.2mm to 35mm;

3. Forged wheels within bearings;

4. WIRE ROPE PULLEY BLOCK WITH HOOK, SHACKLE, RING;

5. The Dia of wheels is from 80mm to 270mm;

6. Individually proof test at 3 times working load limit;

7. Breakage test;

8.For the HOOK,SHACKLE AND RING, the material is super alloy steel-Quenched and Tempered;

9.We are willing to product the pulley as your requests or OEM.

 

Size		WLLT	Dia.of rope(mm)		Dia.of Wheel(mm)	Net weight (kg)
			Apply	Largest
Wheel open hook pulley	HQG(L)Z1-0.5	0.5	6.2	7.7	71	1.75
	HQG(L)Z1-5	5.0	15.5	18.5	160	19.00
	HQG(L)Z1-20	20.0	31.0	35.0	355	162.20
Double wheels hook pulley	HQG(L)Z2-1	1.0	6.2	7.7	71	3.15
	HQG(L)Z2-5	5.	12.5	15.5	132	20.00
	HQG(L)Z2-20	20.0	26.0	28.0	280	138.90
Three wheels hook pulley	HQG(L)Z3-3.2	3.2	7.7	11.0	85	8.20
	HQG(L)Z3-10	10.0	15.5	18.5	160	47.00
	HQG(L)Z3-50	50.0	31.0	35.0	355	360.00

 

Company Information

HangZhou CZPT Co.,Ltd is located in HangZhou, China. For many years supplies a range of industrial products that covers lifting, lashing, slings, rigging, marine, mining, towing, transportation, construction, fishing and security applications… We provide not only high quality goods but also more additional benefits for our clients and partners.
With advanced production equipment, superb manufacturing process, strict management and with good quality product.
Under our business ideas “Quality first, Customer first”, our goods are sold better and better.
Facing the market, our company will rely on a strong unity, forge ahead with determination and a leadership and workforce to meet the challenge, in fierce competition in the market ahead waves.
YANFEI will be your best business partner.

• Rigging Hardware
• Stainless Steel Rigging Hardware
• Steel Wire Rope & Fittings
• Chain & Chain Fittings
• Cargo Control Products
• Marine Rigging

FAQ

How to order the products? 

Send the inquiry with detail item description or with ITEM number. Tell us the quantity you need, the size of goods, and the packing. If there is no packing demand we take it as seaway packing. If possible please attach one reference picture to avoid any misunderstanding or any links from our website for we get a better understanding.

About sample:
Cost with free if the quantity small, and the express charge account into buyer’s.

 

About payment:
T/T, LC in U.S. Dollars or EUR, for small orders, PayPal is ok.

About lead time:
Cause all of our products manufacturer according customers order, 

usually within 35days after receipt of your deposit.

How Will My Order Be Shipped?
Usually shipped by sea, small order or urgent order can by air or by courier after received your agreement. 

How long does it take to receive my order?
According the distance from China to your port. Usually from China to European about 22 days. 

To West of American 20 days. To Asia 7 days or more.

By air or by courier will be faster, within 7days.
About mini order:
Different products with different limited, please contact us to confirm.

What’s your quality guarantee?

We have different kinds of products which can meet different quality standard.

YANFEI QC department will teset products before shipping. We have 100% quality guarantee to customers. We will be responsible for any quality problem.

What’s benefit will you bring?

Your client satisfied on the quality.

Your client continued orders.

You can get good reputation from your market and obtain more orders.
 

 

Pulley Type

There are several types of pulleys. These include fixed pulleys, load multipliers and movable pulleys. Below is a description of each pulley type. A load multiplier is a special type of pulley with multiple wheels for increased lifting capacity. It is used in a wide range of applications including power transmission and construction. Some common uses of pulleys are listed below.

moving pulley

Movable pulleys work by transferring the weight of a load to another object of the same mass. Since a live pulley is inherently frictionless and weightless, the force required to lift a load with it is the same as the weight of the load. This principle applies to tall buildings and residences. It is an excellent choice for lifting heavy objects such as furniture and washing machines.
A pulley is a mechanical device with a wheel that rotates on a shaft. The axle is attached to the wheel and is usually fixed. The movable pulley can be fixed or movable, both of which can change the direction of the force on the rope. Some pulleys can also change the magnitude and direction of the force. They are ideal for a variety of applications, from lifting heavy objects to transporting objects.
Another type of movable pulley works by transmitting force to another object. It has a free axis and the total force provided by the rope tension is balanced. Since the tension on the rope is constant in each segment, pulling 1 end of the rope will double the force on the shaft, resulting in 2 mechanical advantages. This mechanical advantage is the main reason why movable pulleys are so versatile.
Another form of moving pulley is called a KWL diagram. The KWL diagram summarizes the basic concepts of the drive wheel. KWL diagrams are an excellent way to assess a student’s understanding of the concepts discussed in the course. Word questions are a great way to check whether students understand concepts. When students answer the word questions correctly, the answer is yes!

Fixed wheel pulley

If you need to move heavy objects, a single fixed wheel pulley is not a good choice. Using a single fixed pulley might be similar to using a handbag, but it’s not very convenient. This type of pulley system relies on friction to transmit motion. As a result, it can slip and isn’t always reliable. Fortunately, you can find other options that work just as well.
Fixed pulleys are the most basic type of pulley. They consist of grooved wheels and ropes attached to objects. These pulleys make lifting easier. Because the rope or cable only moves in 1 direction, the movement of the object feels lighter. And they are also easy to install. However, before you buy a fixed wheel pulley, make sure it is strong enough to support the weight of the load.
The disadvantages of fixed pulleys are obvious. One of them is the lack of mechanical advantage. A fixed pulley pulls up with the same force as a single moving pulley, and a single fixed pulley is not particularly effective as a force multiplier. However, the effect is more pronounced when you combine multiple fixed-wheel pulleys. You will get double the power! So what do fixed wheel pulleys have to offer?
Fixed wheel pulleys can be as small as a ring. A single ring pulley requires twice as much force as the weight being pulled. Adding more loops to the rope will reduce the effort required to pull the weight. The mechanical advantage of a fixed pulley is proportional to the number of strands running to the free pulley. A 100-pound pull on the free end will lift a 300-pound load.

composite pulley

Compound pulleys are pulleys that can be used to change the direction of a control wire. It can also be used to modify the mechanical force of the wire by moving the item it is connected to. In galleons, compound pulleys are more common. They are often combined with other ropes for mechanical advantage. Here are some common uses for composite pulleys.
The ideal mechanical advantage of a pulley is equal to the number of rope segments that pull up the load. This means that the more rope segments, the less force is required. A compound pulley will have the ideal mechanical advantage of 2, which means it will generate more force than a simple pulley. Composite pulleys are also more efficient at transmitting force because their number of rope segments is usually equal to the unit weight.
Composite pulley systems use more than 2 pulleys and ropes. More pulleys will reduce the force required to move heavier objects. They are usually used in large sailboats. The system is also used on construction sites. It can be used for a variety of applications, including lifting large objects or transmitting electricity. You can imagine how it would change your life if you had to move a large sailboat, but the result would be the same: a composite pulley system would make it easier to lift a large sailboat.
Composite pulleys are also known as fixed pulleys. The fixed pulley is stationary, and the movable pulley moves back and forth. The latter is more effective when used with a detachable cord or strap. On the other hand, a moving pulley is a moving pulley and it gives you a mechanical advantage. You can imagine this pulley on a flagpole.

load multiplier

The multiplication system has 3 basic parts: the rope grab, the connector, and the pulley. While some basic multipliers may combine the 3 parts, the concept remains the same. The multiplication system can make pulling the rope easier by reducing the amount of friction that occurs. Below are some examples of multiplication systems. A compact rope grab is a great option for resetting the multiplier.
The load reduction that a pulley system can achieve is proportional to the number of ropes used to support it. Although most utility pulley systems use only 4 ropes, the theoretical maximum load reduction is a quarter of the actual load. In other words, the four-wheel system only reduces the weight of a 1,000-pound load by a quarter. That would require 167 pounds of force, a far cry from the 500-pound load a single pulley system can achieve.
The mechanical advantage of a pulley system can be calculated by calculating the ratio between the forces exerted on each wire. For example, a 90-kilogram load is supported by 3 ropes, each weighing about 30-5 pounds. The ropes on pulleys A and B each carry a load of 60 kg. Using this formula, a single pulley system will yield a mechanical advantage over 2 tractors.
To calculate the force required to pull the rope over the pulley, measure the angle and deflection between the ropes. The deflection angle when added to the included angle should equal 180 degrees. A 75 degree angle requires 159% of the load force. This means a total load multiplier of four. This formula is an important tool for calculating the force multiple of the pulley.

Disadvantages of fixed pulleys

There are 2 basic types of pulleys: movable and fixed. Active pulleys are more advanced, allowing the pulley to move according to the load. They reduce the force required to lift the load. Active roller pulleys are more compact and therefore take up less space. Both types are good for lifting heavier objects, but they each have their pros and cons.
Fixed wheel pulleys can be used to lift heavy objects. This type of pulley consists of a wheel with a fixed shaft that has grooves on its edges for guiding ropes or cables. This is a simple machine as no motor or engine is required to lift objects. When 2 or more wheels are used together, the ropes around the wheels form a powerful hoist.
Single wheel pulleys are not suitable for lifting. They tend to push things down. Also, they are unreliable because they rely on friction and can slip. Also, a single wheel pulley would require a lot of space. Another disadvantage of fixed-wheel pulleys is that they make it difficult to move heavy objects easily. Single fixed-wheel pulleys also tend to slip easily, making them a poor choice for many applications.
Fixed wheel pulleys are also easier to install and maintain than manually operated ones. It requires less space and lubrication than manual pulleys. Manual pulleys can cause injury because the operator will be lifting the full weight of the heavy object. Additionally, rope slippage can lead to muscle strains and rope burns. And the system requires frequent maintenance.