RU2225602C2 - Gear for dynamic balancing of articles - Google Patents

Abstract

FIELD: balancing equipment, dynamic balancing of machines and sets. SUBSTANCE: gear includes bed frame with support for balance of article put on it, two vibration-sensing systems with springy members installed in symmetry. One end of springy member of vibration-sensing system is permanently fixed on support and the other end of springy member of same vibration-sensing system is linked to location seat of balanced article. Besides them gear has rotation motor, balancing mandrel and transducers of rotation and vibration connected to unbalance meter. Gear includes in addition platform attached to one end of springy members of second vibration-sensing system and coupled through turning joint to immobile part of motor, second ends of these springy member are permanently linked to bed frame. Balancing mandrel is connected directly to shaft of rotation motor that is electrically coupled to braking unit. EFFECT: simplified design of gear, increased accuracy of balancing of articles. 2 cl, 1 dwg

Description

 The invention relates to balancing equipment and can be used for dynamic balancing of machine components and assemblies.

 A device is known that contains a fixed base with a rotation motor mounted on the base, supports, vibration-absorbing mechanical system associated with a mounting location for a balancing product, rotation speed and vibration sensors associated with an imbalance meter. The rotation of the balanced product is carried out using a tangential belt drive [Catalog of the company "Schenk" B1124. Balancing machines].

 The disadvantage of this device is the rapid wear of the belt drive belt especially with a rough side surface of the balanced product and the impact on the measurement result of shocks from the instability of the transmission of rotation of the product from the cut of the side surface of the balanced product. When accelerating a balanced product, the belt drive belt can slip, and with a large mass of the balanced product, it is necessary to ensure slow acceleration, which reduces the performance of the device. To stop the balancing product after measurement, an additional braking mechanism is required.

 A device for dynamically balancing rotation details is also known, comprising a fixed base with a rotation motor mounted on it and a transmission mechanism for this rotation with a spindle, the seat of which is connected to the balancing product, and a vibration-absorbing mechanical system with flat springs, one end connected to the base, and the other - with an installation place for the balanced product. The signals removed from the speed and vibration sensors are fed to the imbalance meter. For balancing on this device, the balanced product is mounted on supports, connected to the drive mechanism through the balancing mandrel and spindle, accelerate the product to the balancing frequency, and measure the magnitude and angle of the mass imbalance along the correction planes [Fundamentals of the balancing technique edited by V. Schepetilnikova, M ., Engineering, 1975, v. 1, p. 95].

 The disadvantage of this device is the presence of a technical imbalance introduced by the bearings, misalignment in the joints and runout of the balancing mandrel in the bearings of the transmission mechanism, which leads to power losses, reduces the sensitivity of determining the imbalance components and complicates the design of the device. Due to the immobility of the spindle during rotation of the product with an unbalanced mass, the forces acting on backlash and gaps act on the elastic elements of the vibration-sensing system.

 As a result, the nature of the vibrations of vibration-absorbing elastic elements is determined not only by the imbalance of the balanced product.

 This leads, along with the scatter of readings during measurements, to a decrease in the reliability of the measurement results. The need to use precision parts complicates the design of the device.

 The objective of the invention is improving accuracy and simplifying the design.

 The technical result of this task is achieved by the fact that the device for dynamic balancing, comprising a bed with a support mounted on it for a balancing product, two vibration-sensing systems with symmetrically mounted elastic elements, one end of the elastic elements of the vibration-sensing system is connected to a mounting location for the balancing product, the rotation motor , a balancing mandrel and rotation and vibration sensors connected to an imbalance meter, it further comprises a connected through the articulation to the stationary part of the engine rotational platform attached to one end of the second elastic elements vibrovosprinimayuschey system, and the second ends of these elastic members is fixedly connected to the frame, wherein, balancing the mandrel is connected directly to the motor shaft rotation. The device comprises a braking unit electrically connected to the power winding of the rotation motor. Swivel fixed part of the rotation motor with the platform is made in the form of a spherical bearing.

 The drawing shows a structural diagram of a device for dynamic balancing of products.

 The device comprises a fixed bed 1 with a movable support 2.

 On the bed 1 and on the support 2, the ends of two pairs of elastic elements 3, 4 and 5, 6 are symmetrically fixed, the second ends of one pair 3, 4 are attached to the platform 7, and the second pair 5, 6 to the mounting location 8 for the balanced product 11. On the platform 7, through a swivel joint 8 made in the form of a spherical bearing, the fixed part of the rotation motor 9 is fixed, on the shaft of which a balancing mandrel 10 is fixed, which is connected to the balanced product 11.

 The rotation sensor 12 is installed on the housing of the rotation motor 9, and the movable rods of the vibration sensors 13 are connected to the plane by elastic elements 3, 4 and 5, 6, while the housing of the vibration sensor is mounted on the frame 1. The outputs of the sensors 12 and 13 are connected to the imbalance meter 14. When this rotation motor is electrically connected to the braking unit 15.

 The device operates as follows.

 Using the balancing mandrel 10, the balanced product 11 is connected to the shaft of the rotation motor 9 and rotated to a frequency higher than the oscillation frequency of the platform 7.

 The signals from the sensors 13 from the oscillations of the elastic elements 3, 4 and 5, 6 and the rotational speed sensor 12 are fed to the imbalance meter 14, in which the correction planes are separated, and the imbalance components are determined by the magnitude and location angle of the unbalanced mass.

 After measuring the components of the imbalance, the power from the rotation motor 9 is turned off, and a constant voltage of decreasing amplitude is supplied to the power winding from the braking unit 15.

 The connection of the balanced product with the shaft of the rotation motor through the balancing mandrel without additional structural elements eliminates the influence of friction and beats in the transmission elements on the measurement result, while improving the measurement accuracy and reducing energy consumption.

 When the device is put into operation, the rotation motor is turned on at rated power and due to the equality of angular velocities due to tight coupling, the balanced product quickly accelerates to working revolutions, which increases the performance of the balancing operation.

 Turning on the rotation motor at rated power allows you to go through the resonance of the mechanical system, eliminating significant vibration with a large initial imbalance.

 During acceleration, the overload of the rotation motor in power exceeds the nominal one by no more than 3-4 times, which does not have a significant effect due to the short duration of the overload (not more than 15 s) on the life of the rotation engine. The rotation frequency of the balanced product due to the large moment of inertia of the system "rotor of the rotation motor - balanced product" is stabilized and additional synchronization is not required.

 The use of the hinged support allows to exclude with a large initial imbalance the twisting of the elastic elements and the "fracture" of the link of the rotation motor and the balanced product. Precision parts are excluded from the design.

Claims (3)

1. A device for dynamic balancing, comprising a bed with a support mounted on it for a balanced product, two vibration-sensing systems with symmetrically mounted elastic elements, while one end of the elastic elements of the vibration-sensing system is fixedly mounted on the support, and the second end of the elastic elements of the same vibration-sensing system is connected with mounting location for a balanced product, a rotation motor, a balancing mandrel, and rotation and vibration sensors connected to a disb meter lance, characterized in that it further comprises a platform connected via a hinge to the fixed part of the engine, attached to one end of the elastic elements of the second vibration-sensing system, and the second ends of these elastic elements are fixedly connected to the bed, and the balancing mandrel is connected directly to the shaft of the rotation motor. 2. The device according to claim 1, characterized in that it contains a braking unit, electrically connected to the power winding of the rotation motor. 3. The device according to claim 1, characterized in that the swivel is made in the form of a bearing.