Jiaozuo brake

Crane winch disc brake manufacturer

Research level and current status of noise inside and outside of service brakes

The early research on brake noise focused on the drum brake which was widely used at that time. Now the disk brake has become the focus of research because of its wide application. The systematic research on brake vibration and noise from both theoretical and technical perspectives began in the 1950s. So far, many practical engineering methods and various mechanical models have been accumulated to solve specific problems. But so far, there has been no consistent conclusion on the research of this problem from the mechanism to the analysis method. The measures used in engineering to suppress the generation of screams are basically empirical and do not have universality.

The frequency range of braking noise of winch disc brake of crane is very wide. It can range from tens of hertz to tens of thousands of hertz. During a braking session, the braking noise is mostly a single tone, with occasional occurrences of two or three tones simultaneously. In the perception of the human ear, the high-frequency components generally within a few million hertz are harsh and difficult to eliminate. They are the main component of braking noise and are also the focus that manufacturers need to study and solve. Throughout the 1950s, the characteristics of friction materials themselves were considered the fundamental cause of brake squealing. There are two main theories at this stage. The theory attributes the brake squeal to the frictional characteristics of the friction pair. Based on this theory, the study can simply attribute the brake squeal to the self-excited vibration problem of the braking system when the static friction coefficient is greater than the dynamic friction coefficient or the change rate of the dynamic friction coefficient f with the relative sliding speed v. Caliper disc brakes were used only as central brakes in the past, but now they are increasingly used as wheel brakes by various cars and trucks. The full disc brake is only used for a few vehicles, mainly heavy vehicles as wheel brakes, and can also be used as a retarder in some cases.

The winch disc brake of crane, especially the floating caliper disc brake, is widely used because it has the following advantages:

A. The output torque of the disc brake is less affected by the temperature change, and the performance is stable and reliable;

B. Most of the brake discs of the disc brake are exposed to the air, so the heat dissipation capacity is strong, and the temperature change of the brake disc is small during braking;

C. After the temperature of the brake disc rises, the variation along the thickness direction is much smaller than the radial variation of the brake drum, resulting in smaller changes in pedal travel and brake air conditioning, and a relatively stable time for the brake to function;

D. The braking performance of the disc brake recovers quickly after wading, and it only needs one or two times of braking to return to normal;

E. When the output braking torque is the same, the size and mass are generally smaller;

F. It is easier to achieve clearance action adjustment, and other maintenance and repair operations are also simpler.

The theory of friction characteristics of winch disc brake of crane can explain some phenomena of brake squeal, but it is inconsistent with many test results. Even with the same friction pair, the tendency to squeal varies greatly for brakes with different structures. R. The research results of TSpur indicate that sometimes unrelated braking screams still occur, and even if they are large, braking screams may not necessarily occur, leading to the emergence of a second theory, the Sprag slip theory. The Sprag Slip theory explains that when the friction coefficient is constant (that is, f is independent of), the self-excited vibration of the system can be caused only by the improper selection of the geometric characteristics of the friction pair. The further development of this theory has led to the formation of the geometric characteristic coupling theory. The coupling theory of geometric characteristics emphasizes the influence of structural coupling characteristics (friction coupling between friction surfaces and elastic coupling between various components) on brake squeal. The f-characteristic of friction materials is not a necessary condition for generating brake squeal, and f itself is also an important factor affecting brake squeal. For driving, brakes are not only working devices but also safety devices. With the development of technology and the improvement of energy-saving and environmental protection requirements, more and more permanent magnet synchronous gearless traction machines will replace traditional worm gear and worm type traction machines. Therefore, there may be no need to install a separate upstream overspeed protection device. The brake of this type of permanent magnet synchronous gearless traction machine (which should undergo type testing) has an upstream overspeed protection function. The disc brake uses the end face of the disc as the contact surface of the friction pair. Crane winch disc brake

Disc brake is also called disc brake, which is named after its shape as its name implies. It is controlled by hydraulic pressure and its main components include brake discs, wheel cylinders, brake calipers, oil pipes, etc. The brake disc is made of alloy steel and fixed on the wheel. It rotates with the wheel. The friction brake can be divided into disc brake, external holding block brake, internal expanding shoe brake, band brake, comprehensive band brake, double shoe brake, multi shoe brake, simple single band brake, single disc brake, multi disc brake, fixed caliper brake, floating brake, etc. In 1991, it was awarded the Henan Province High Quality Product Award. In 1993, it was awarded the Brake Product Quality Approval Certificate by the National Center for Quality Supervision and Inspection of Lifting and Transportation Machinery. In 1994, it was awarded the Contract and Credit Enterprise by the Provincial Administration for Industry and Commerce. In 2002, it was the first to pass the International ISO9001:2000 Standard Quality Approval Certificate. In 2006, it was awarded the National "Special Equipment Type Test and Verification Certificate". Passed the international "Coal Mine Safety Certification" and "Explosion Proof Certificate" in 2011; Our company's products are now widely used and highly praised in industries such as metallurgy, ports, construction, hydraulic engineering, and lifting transportation nationwide. Our company aims to provide high-quality products, reasonable product prices, and comprehensive pre-sales and after-sales services. We are willing to sincerely cooperate with new and old friends for common development.

Crane winch disc brake

Hydraulic disc brake

SB50, SB100, SB160, SB250, SB315, SB400, YQP50, YQP100, YQP160, YQP250, YQP315, YQP400

SBD100-A, SBD125-A, SBD160-A, SBD200-A, SBD250-A

SBD80-B, SBD160-B, SBD250-C, SBD365-C, SBD425-C, SBD120-D, SBD240-D,

ST1SH, ST2SH, ST3SH, ST4SH, ST5SH, ST10SH, ST16SH, ST25SH, ST25SH-A, ST25SH-C, ST40SH, ST1SH-A

450SH, 4SH, 3SH, 5SH, 904SH

ST, SBD, SH images