Tyre coupling

Tire coupling tire body is one of the necessary spare parts of tire coupling, correspondingly divided into UL, LA, LB tire bodies.Tire couplings are divided into two categories: convex and concave. The convex is divided into three types: integral with frame, integral without bone and radial incision.The inner side of the tire ring is bonded to the steel frame by a vulcanization method, and the bolt holes on the frame are welded with nuts.When assembling, bolts are used to connect the flanges of the two coupling halves. The friction force generated between the tire and the flange end faces by tightening the bolts is used to transmit torque. The torsional shear deformation of the tire ring occurs when the tire ring is working, so the tire coupling It has a high elasticity, a large ability to compensate the relative displacement of the two shafts, and has good damping, and has a simple structure, does not require lubrication, and is relatively convenient for assembly and disassembly and maintenance.The disadvantage is that the bearing capacity is not high and the external dimension is large. As the relative torsion angle of the two shafts increases, the tire shape is twisted, and the axial dimension is slightly reduced, which will generate a large additional axial force on the two shafts. Increase the bearing load and reduce the life.When the tire coupling is running at high speed, the outer edge of the tire expands outward due to the centrifugal force, which will further increase the additional axial force.For this reason, measures should be taken when installing the coupling to make the direction of stress in the tire opposite to the direction of stress generated during work to offset part of the additional axial force and improve the working conditions of the coupling and the two bearings.

Chinese name tire coupling type convex and concave type classification UL, LA, LB tire body attributes necessary spare parts for tire coupling

Imbalance

Due to various reasons, the center of mass or inertial principal axis of the tire coupling does not coincide with the axis of rotation, and the phenomenon of unbalanced centrifugal inertia force, centrifugal inertia couple and dynamic deflection (vibration shape) will occur during operation. Balance phenomenon, this imbalance phenomenon will inevitably cause the vibration of the shaft system, which will affect the normal operation and service life of the machine, so it must be paid attention to.

In order to correct or minimize the unbalance of the tire coupling, the appropriate balance level should be selected according to the needs, and after the product is manufactured and installed on the machine, it is on the specified balance (correction) plane of the coupling , Through the method of increasing or reducing the appropriate quality, so that it reaches the balance level requirements. This process is called balance correction, or balance for short.

The degree of unbalance (unbalance U) is usually expressed by the product mr of the mass m of the rotor and the distance r from the center of mass to the axis of rotation of the rotor, which is called the product of mass diameter. It is also expressed by the product of mass diameter per unit mass, which is called eccentricity. Distance e (not geometrically eccentric.) The mass diameter product mr is a relative quantity related to the rotor mass, while the eccentricity e is an absolute quantity that has nothing to do with the rotor mass. The former is more intuitive and often used for specific rotors Balancing operation, the latter is used to measure the pros and cons of the rotor balance or to detect the balance accuracy, and the balance grade standard of the tire coupling is evaluated by e.

Analysis of advantages and disadvantages

Analysis of the advantages and disadvantages of LLB tire couplings: tire couplings are divided into two categories: convex and concave. The convex is divided into three types: integral with skeleton, integral without bone and radial incision. Their common features The tire ring is bolted to connect the two halves of the coupling to realize the connection of the two shafts. The inner side of the tire ring is bonded to the steel frame by a vulcanization method, and the bolt hole on the frame is welded with a nut.When assembling, bolts are used to connect the flanges of the two halves of the coupling, and the torque is transmitted by the friction generated between the tire and the end face of the flange by tightening the bolts. The torsional shear deformation of the tire ring occurs when the tire ring is working, so the tire coupling It has high elasticity, has a large ability to compensate the relative displacement of the two shafts, and has good damping, and the structure is simple, does not require lubrication, and is relatively convenient for assembly and disassembly and maintenance.

The disadvantage of the LLB tire coupling is that the load capacity is not high and the overall size is large. As the relative torsion angle of the two shafts increases, the tire shape is twisted, and the axial size is slightly reduced, which will produce a larger size on the two shafts. The additional axial force of the bearing increases the bearing load and reduces the life. When the tire coupling is running at high speed, the centrifugal force of the outer edge of the tire expands outwards, which will further increase the additional axial force. For this reason, install the coupling Measures should be taken to make the direction of stress in the tire opposite to the direction of stress generated during work to offset part of the additional axial force and improve the working conditions of the coupling and the two bearings.

Classification and characteristics

The main types of tire couplings are: UL tire coupling, LLB tire coupling, LLA tire coupling, DL polygonal rubber coupling, LAK saddle block elastic coupling, etc. UL type, LLB type, and LLA type are several models that are more commonly used.Below we will focus on the characteristics of these couplings: UL tire coupling specifications are mainly UL1-18, nominal torque: 10-25000, allowable speed: 5000-800, shaft hole diameter: 11 -180mm, shaft hole length: 22-302mm, weight: 0.7-818, material: 45# round steel, cast steel, forged steel. UL tire coupling has good shock absorption and cushioning performance, which solves the cushioning effect that cannot be achieved by general couplings.

LLB type tire coupling specifications

LLB type tire coupling specifications: LLB1-13 type tire body model: LTB1-13, standard number (JBT10541-2005) original standard (JBZQ4018-85) material cast steel, cast iron and 45# round steel, other materials are also available from our factory Can be customized, nominal torque: 10-20000 allowable speed: 5000-1000 shaft hole diameter: 6-200mm shaft hole length: 16-382mm, quality: 0.4-340. LLB tire couplings are mostly used in metallurgical equipment, so they are also called tire couplings for metallurgical equipment. The tire coupling for LLB metallurgical equipment is a highly elastic coupling with good shock absorption and excellent inter-axis offset compensation performance. It is suitable for humidity, dust, shock, vibration, and more forward and reverse rotation. The working conditions are frequently changed and started, and it is easy to disassemble and assemble.

LLA tire coupling specifications

LLA Tire Coupling for Metallurgical Equipment Specification: LA1-11 Nominal Torque: 10-20000 Permissible Speed: 5000-800 Shaft Hole Diameter: 5-180 Shaft Hole Length: 14-302 Weight: 0.35-373kg Material: Cast Iron Cast steel, suitable for working conditions such as humidity, dust, shock, vibration, changeable forward and reverse rotation, and frequent starting. It is easy to disassemble and assemble without lubrication, and is durable and reliable.

UL type tire coupling specifications

Among the three kinds of couplings, the UL type tire coupling is the most commonly used. The tire bodies of the three tire couplings are different, and the tire bodies of the UL and LLB tire couplings are not open. Yes, the tire body of the LLA tire coupling is open. Under the same model, the LLB tire body is thicker than the UL tire body. The tire body of the tire coupling adopts high-quality rubber, and the rubber has nylon threads inside. , Nylon cloth, so the tire body quality is reliable, elastic, long life and other characteristics, which is not common tire body.