Блокировочная втулка Z7B Z7A Z7C с блокировкой питания блокировочные устройства без ключа в сборе сменный термоусадочный диск

 Z7B expansion sleeve,  expandable sleeve, locking devices/Locking Assemblies /Exchangeable Shrink Disc (JB/T7934-1999)

Locking devices (referred to as the expansion joint sleeve) is a new type of advanced mechanical basic parts.

It is a new type of keyless coupling device widely used in the world to realize the transmission of load and friction by tightening 12.9 high-strength screws to achieve the load transmission.

The main function of locking devices is to replace the joint function of the single key and the spline to realize the connection of the mechanical parts (such as gears, flywheels, pulleys, etc.) with the shaft to transmit the load.

Advantages

This has many unique advantages over the general interference joint and keyed joints:
(1) The use of expansion sleeves makes the manufacture and installation of the main parts simple. The machining of the shaft and the hole in which the expansion sleeve is mounted does not require high precision manufacturing tolerances like an interference fit. There is no need to heat, cool or pressurize the expansion sleeve, just tighten the bolts to the required torque. And easy to adjust, the hub can be easily adjusted to the desired position on the shaft. Expansion sleeves can also be used to join parts with poor weldability.
(2) The expansion sleeve has a long service life and high strength. The expansion sleeve relies on the friction transmission, and there is no key groove weakening on the joint member, and there is no relative movement, and no wear occurs during the work.
(3) When the expansion sleeve is overloaded, it will lose the coupling effect and protect the equipment from damage.
(4) The expansion sleeve can bear multiple loads, and its structure can be made into various patterns. Depending on the size of the installed load, it is also possible to use multiple expansion sleeves in series.
(5) The expansion sleeve is easy to disassemble and has good interchangeability. Since the expansion sleeve can combine the hubs with large matching gaps, the bolts can be loosened during disassembly, so that the joints can be easily disassembled. When the expansion is tight, the contact surface is tightly fitted and is not easy to cause rust, and is also easy to be coupled and disassembled.

Application: mining machinery, coal mining machinery, ball mill, belt conveyor, packaging machinery, heavy machinery, light industrial machinery, food machinery, CNC machine tools, metallurgical machinery, textile machinery, printing machinery, plastic machinery, chemical machinery, paper machinery, Marine machinery, tobacco machinery, fans, blowers, reducers, etc.

1, installation:

The expansion sleeve is greased at the factory and can be installed directly. When installing, first screw three bolts 4 into the screw holes of the flange of the other part 1 and spread them evenly around the circumference to open the inner sleeve 1 and the outer sleeve 2. Then place the expansion sleeve into the hub hole of the design position and tighten the bolt with the force gauge. The method of tightening is to screw each bolt to 1/4 of the rated torque at a time. The order of tightening is bounded by the slit. The left and right cross symmetry is tightened one after the other to ensure that the rated torque value is reached. 

2. Disassembly:

Loosen all bolts a few turns before disassembly. Then screw in the bolt 4 top loose sleeve in the disassembled screw hole. 

3. Protection:

MoS2 oil is strictly prohibited during installation to prevent contamination of the expansion sleeve. On machines with poor open air or working environment, rust-proof grease should be applied regularly on the exposed end face and bolts of the expansion sleeve. The expansion sleeve type with better rust resistance should be selected.

Model: Z7B expansion sleeve locking devics

The Z7 expansion sleeve is a keyless coupling device between the shaft and the sleeve.
The device can apply a clamping force to the sleeve from the outside to form a mechanical compression fit between the shaft and the sleeve to transmit torque and expand.
Easy to disassemble and is suitable for transmitting torque at low and medium speeds.

Surface: polished

Material: 45# steel 

Nominal torque/ rated torque:  216Nm-25125Nm 

Hole diameter: 24mm-140mm 

screws of locking devices has a mechanical performance rating of 12.9. 

Application:  Wind power gearbox | Ships | Gearboxes and pulleys.
Features: High torque transmission for easy assembly and disassembly.

Main dimensions for your kind reference.