Maximal weight, kg
Maximal diameter, mm
Machine for balancing wheel pairs of railway vehicles
The balancing machine model 9718K is a special equipment whose task is to balance wheel pairs of railway trains with a weight of up to 3000 kg. The machine can be used for balancing wheel pairs of freight and passenger locomotives.
The machine was designed for the repair shops of railway depots, but the modularity of the equipment design and high performance allow using the machine of this model and for the production of wheelsets in small series productions. This special equipment can be easily adapted to work as a part of production lines and complexes.
The 9718K machine can perform the following functions:- Dynamic two-plane balancing of wheelsets;
- Balancing of wheelsets together with a gearbox (optional);
- Quality control of wheelset manufacturing and assembly;
- Quality control of wheelset balancing;
- Control of radial and axial run-out of wheels (option).
The machine consists of two vibratory supports with “pendulum” hangers and roller self-aligning blocks. The machine has a monolithic bed on which the supports can move during changeover. There is also an axial drive in the form of a tailstock in which the electric drive and the machine’s electrical equipment are mounted. The machine and the hardware-software complex PAK-ZhD are controlled from the retractable control panel, in which an industrial computer with a touch screen and a computing unit of the balancing system are also installed.
Transfer of rotation from the electric drive to the wheelset is carried out by means of a cardan gear which is connected to the wheelset neck using an adapter. The electric drive has a smooth adjustment of the rotation speed thanks to a frequency converter.
Machine can be optionally completed with such modules as jack, gearbox fixing bracket, run-out control module and unbalance correction module. If required, the machine can also be supplied with a cabinet guard.
- The machine has the ability to be reconfigured for any type of wheelsets, which extends its functionality;
- The equipment can be equipped with jacks for shock-free installation of the wheelset. This will help to save machine components, ensuring high balancing accuracy for many years and wheelset surfaces for correct installation of axlebox bearings. The jacks are also equipped with catches, which allows you to instantly center the wheelset when installing it;
- If you equip the machine with the gearbox mounting bracket you can easily balance the wheelsets together with the gearbox without having to disassemble and reassemble the wheelset;
- Installation of the unbalance correction module will allow to correct unbalance of the wheelset without removing it from the machine, saving time on the installation / removal of the product from the machine, as well as without distracting other professionals from their processes;
- The module for measuring radial and axial run-out of the wheelset allows you to sort out the wheelsets that do not meet the quality requirements of manufacturing;
- Intuitive interface displays unbalance magnitude and angular position in “real time” in two planes simultaneously on one screen. It also provides prompting when the unbalance tolerance is reached, providing comfortable operation for people of all skill levels;
- Machine calibration takes one minute and is done by the machine operator, which ensures high accuracy at all times and saves time and money in calling out technicians;
- Measurements can even be run at low speeds (200-400 rpm), for safe operation of the machine operator and the people around him;
- The ability to save and print balancing reports allows you to organize control with full reporting.
Specialized Railway Application Engineering
- Dual coordinate system measurementĀ – Provides unbalance measurement in polar coordinates across two planes with display relative to both wheel rolling geometric centers and actual axle bearing rotation axis. This dual-reference capability ensures optimal wheelset performance in real operating conditions.
- Railway-specific load handlingĀ – Engineered to accommodate wheelsets weighing 800-3000 kg with wheel diameters from 700-1350 mm and standard railway axle widths of 2000-2300 mm. The robust construction handles the demanding requirements of traction stock wheelsets while maintaining precision for lighter applications.
- Gearbox-equipped wheelset compatibilityĀ – Features special additional equipment for balancing wheelsets with integrated gearboxes driven from the middle axle section without requiring gearbox removal. This capability significantly reduces preparation time and eliminates complex disassembly procedures.
Precision Measurement & Control Systems
- Three-starts calibration method – PAK-ZhD balancing system employs advanced calibration procedure performed for each new rotor, ensuring consistently high sensitivity and measurement accuracy. This method guarantees optimal machine performance regardless of wheelset variations.
- Real-time processing and analysisĀ – Information processing occurs in real-time mode, allowing continuous tracking of unbalance behavior and enhanced analysis capabilities. The system provides immediate feedback for faster decision-making and improved balancing efficiency.
- Dual-plane simultaneous operationĀ – Balancing system processes two correction planes simultaneously, significantly reducing overall balancing cycle time. This parallel processing capability doubles productivity compared to sequential single-plane systems.
Advanced Mechanical Design
- Lever suspension systemĀ – Employs lever design for movable support suspension, achieving high accuracy at operating speeds of 200-400 rpm while enabling visual analysis of residual unbalance levels. The low natural resonant frequency design guarantees optimal balancing precision.
- Self-aligning roller bearingsĀ – Incorporates cylindrical hardened rollers that eliminate knurling formation on mounting journals, particularly important for low-hardness, high-mass wheelsets. The self-installation function eliminates adjustment requirements and reduces setup time.
- Pneumatic jack installation systemĀ – Equipped with specialized jacks featuring automatic centering catchers for quick, shock-free wheelset installation and removal. This system protects both wheelset bearing journals and machine support rollers from impact damage.
High-Performance Drive System
- Axial cardan drive configurationĀ – Features full-spindle design with quill mechanism capable of transmitting high torque for rapid wheelset acceleration and deceleration. The robust drive system significantly shortens balancing cycles while increasing overall machine reliability.
- Frequency-controlled electric motorĀ – Oversized motor with power reserve reduces acceleration/deceleration times while extending service life through reduced stress operation. The frequency converter provides electrical equipment protection and enables stepless speed regulation.
- Smooth speed transition controlĀ – Integrated frequency converter allows continuous speed adjustment without motor shutdown, optimizing balancing modes for different wheelset types. This capability ensures ideal operating conditions for each specific application.
Operator Interface & Productivity Features
- Industrial PC with touch screen – Windows OS-based system with intuitive touch interface includes comprehensive operational hints and diagnostic diagrams for rapid operator training. The visual interface simplifies information analysis and reduces learning curve requirements.
- Optional milling device integrationĀ – Machine can be equipped with additional milling equipment for direct imbalance correction, eliminating the need for external correction operations. This integrated approach streamlines the complete balancing and correction process.
- Axial and radial runout monitoringĀ – Available sensor options provide comprehensive geometric analysis beyond standard unbalance measurement, ensuring complete wheelset quality assessment. These additional measurements support predictive maintenance and quality control protocols.
The specialized PAK-ZhD balancing system is designed for use with a horizontal balancing machine for railway wheelsets. It provides precise measurement of imbalance in the wheel planes both relative to the axis passing through the geometric centers of the wheel rolling circles and relative to the rotational axis of the wheelset. During measurement, the wheelset is mounted by the journal necks of the axle on the machineās roller supports, ensuring accurate positioning.
The system is built on an industrial fanless computer with a touchscreen and a modern measuring unit, delivering high reliability, noise immunity, and ease of operation.
In addition to measuring the imbalance of the wheelset, the system determines the vector of eccentricity of the wheel rolling circles relative to the journal necks. After calculating the imbalance relative to the journal necks and the eccentricity, the software automatically computes the imbalance values relative to the axis passing through the geometric centers of the rolling circles.
Useful Features for Railway Wheelsets Balancing
- In Balancing mode, the system determines imbalance values relative to the rotational axis of the wheelset.
- In Eccentricity mode, it measures the displacement of the wheel rimsā centers relative to the rotational axis.
- The machine automatically switches between Balancing and Eccentricity modes during the automatic operating cycle.
- Builds a combined vector diagram of the imbalance source relative to the axis passing through the geometric centers of the rolling circles.
- Measures both axial and radial runout of the wheelset in the Runout Measurement mode.
Features of the PAK-ZhD System:
- High-precision dynamic balancing and runout measuring.
- Industrial fanless PC with touchscreen and multi-channel measuring unit.
- Three-run setup method using calibration weights.
- Operator-performed calibration, eliminating annual service costs.
- Real-time display of unbalance magnitude and angular position with correction zone highlighting.
- Output of the āUnbalanceā parameter in grams, gĀ·m, microns.
- Output of the āEccentricityā parameter in microns
- Automatic measurement start at target speed and automatic stop upon completion.
- Generation and printing of balancing reports.
- USB ports and Ethernet interfaces for connecting external devices and network integration.
|
Parameter |
Value |
|---|---|
|
Balancing rotors weight range, kg |
800 – 3000 |
|
Maximum rotor diameter (over the bed), mm |
1350 |
|
Distance between rotor bearing journal centers, mm, min/max |
2000 – 2800 |
|
Rotor bearin journals diameter, mm |
50 – 200 |
|
Machine type |
Soft-bearing |
|
Support type |
Rollers |
|
Minimal achievable residual specific unbalance, gmm/kg |
0.4 |
|
Rotor rotation speed range, rpm |
200 – 600 |
|
Drive type |
Cardan |
|
Electric motor power, kW |
15 |
|
Power supply parameters |
400V Ā± 10%, 3 Ph, 50Hz Ā± 1 |
|
Balancing system |
PAK-ZD |
|
Overall machine dimensions (length x width x height), mm |
4000 x 1140 x 1580 |
|
Machine weight, kg |
2800 |
ADDITIONAL OPTIONS
Option of orienting the wheelset in the angular position to the elimination point for each plane automatically at the push of a button by the operator.
For balancing wheelsets with a reducer in the middle of the axis on, there is a jack supporting the reducer housing, and allowing to carry out balancing without disassembling the reducer housing.
Machine’s working area protective guard.