china nucleon crane group: 一月 2017

2017年1月24日星期二

Single girder cranes-nucleon crane group

Single girder cranes

Single girder cranes carry not only the weight

Single-girder crane is a kind of bridge type crane, it relies on hoisting mechanism and two perpendicular direction in the plane of the mobile operation, Can work in the rectangular space and its over, is widely used in industrial and mining enterprises a lifting transport machinery. It has the advantages of large carrying capacity, high reliability, and relatively simple manufacturing process.
After Electric single-beam crane oil pump motor power failure, the hydraulic system due to one-way valve and solenoid valve of the pressure, so that the clamp is always in the open position. However, due to the existence of internal leakage of hydraulic system, after opening the clamp, after a period of time, the degree of opening will be reduced to a certain extent, limit switch,
Will cut off the time relay and connected to the pump motor, re-filling the fuel tank, so that the clamp has returned to fully open position.
Single-girder overhead crane is the most widely used, has the largest single-track operation of a single-girder crane, Its rated weight from several tons to several hundred tons. The most basic form is the universal hook bridge crane, other forms of overhead cranes are derived from the general hook crane on the basis of the development out.
The rail clamp and the locomotive are connected by the hole at the rear end of the clamp shaft. When the locomotive is moving, the guide wheel can roll along the serpentine orbit under the weight pressure of the clip rail when the dragging (moving) clamp moves synchronously. Guide wheel bracket, guide clamp shaft drive clip rail as a whole in the fixed axis along the track surface floating.
Automatic clamping device can automatically electric single-beam crane locked in the track, To prevent accidents by thrust and sliding. The rail clamp is automatically opened when the cart moves, and the other state is automatically clamped. Control system using Siemens PLC control, Without changing the operation of the original machine under the premise, Through the PLC system will be walking crane crane and stop, Brake opening and braking, Clamp opening and clamping movement and other automatic control to improve the machine stability and safety.

For more details, please contact us via info@nucleoncranegroup.com

- See more at: http://www.nucleoncranegroup.com/single-girder-cranes.html

china nucleon crane group: Long Span Gantry Crane

china nucleon crane group: Long Span Gantry Crane: Long Span Gantry Crane Electric Automatic Rectification System of Long Span Gantry Crane double beam gantry crane First, the iss...

Long Span Gantry Crane

Electric Automatic Rectification System of Long Span Gantry Crane

double beam gantry crane

First, the issue raised

Large span greater than 40 meters of the gantry cranes in actual use, due to many factors, such as the height of the rail track and parallel deviation caused by different running resistance, wheel diameter deviation, the motor speed deviation, Time will have a different phenomenon, usually when the deviation near the span of 3/1000, the crane should automatically slow down the correction, the driver can also manually correct deviation deviation indicator; when the deviation exceeds the span of 3/1000, The skew limiter automatically disconnects the running control circuit of the cart, so that the crane automatically stops.

Second, the commonly used electrical automatic correction method

Large-span door to automatic correction, first of all to analyze the causes and phenomena of deviation, and then take the corresponding corrective measures. Usually have the following kinds of electrical automatic correction method:

1, when the leg and the soft leg on both sides of the motor speed is not the same, such as rigid side of the motor side of the average motor speed faster than the soft side of the motor 1/1000, which can be calculated by the pulse encoder PLC pulse number To correct;

2, the main beam and the angle between the soft legs greater than or less than 90 degrees, which can be installed at the top of the soft legs of the angular displacement sensor method to correct;

double girder gantry crane

3, by comparing the rigid leg side carts and soft legs side of the actual running wheel speed of the wheel, which can be used to drive the rubber friction wheel closed-loop control method to correct the deviation;

4, directly in the side of the leg and the soft side of the soft side of the train running next to the rail parallel to install a number of sensing points, the use of proximity switches to measure the side of the leg and the soft side of the action close to the switch and input PLC input method to correct ;

Third, the cart electrical control and automatic correction system

This program uses just, soft leg side of the motor were driven simultaneously with two inverters, using the above method 4 for automatic correction of control. Specific carts electrical control system design guidelines are as follows :,

1, the speed ratio of the cart mechanism is 1:10 or so; one to 5 speed set to 10%, 30%, 50%, 75%, 100% of the fastest speed (the specific speed range see mechanical General Chart);

2, the control mode for the left box linkage master master control; left horizontal body control cart about 5 speed;

3, the cart motor should be added pulse encoder 2, just, soft legs on each side 1;

4, will just, soft leg side of the cart motor PGA, PGB pulse signal feedback to the inverter for closed-loop control;

5, will be just, soft legs next to the actual record of the rail speed pulse +01-S0A / S0B, +02-S0A / S0B pulse signal sent to the PLC input X17, X20;

6, the electrical system uses a variety of protection functions, with motor overload protection, inverter overload protection, power grid over-voltage protection, phase protection, motor speed, stall protection, brake unit overheating protection, door limit switches, Car limit, and so on

Fourth, the electrical automatic correction principle

1, the basic program preparation and parameter setting method is calculated by the speed pulse (rigid) leg side of the side of the actual running distance – using high-performance proximity switch records on the rail anchor plate on the anchor nut on the nut (Of course, accurate calculation can be just in the crane just, soft legs next to the rails equidistant to place some electromagnetic induction point);

2, set the first pulse of the proximity switch side of the actual running speed, the pulse signal immediately into the PLC input X17 (or X20), immediately record speed and automatic correction control.

3, automatic correction method is fast on the way to slow down – such as cranes in the running process, the soft side of the legs faster, soft side of the first switch to the proximity switch to sense the induction nut on the bolt, soft legs close to the control side of the switch Open into the normally closed, the relay K510 pull, PLC input X20 generated input signal can be programmed: LD X20, ANI X17, OUT Y17, then the soft leg of the inverter control input S9B deceleration control signal, The soft side of the four motors immediately deceleration operation, when the rigid side of the proximity switch is also detected bolt nut, it automatically disconnect the S9B input signal, so that soft, rigid side of the motor and at the same time Of the speed of stable operation;

4, such as the crane in the course of running, just the side of the leg faster, rigid side of the proximity switch first sensor to the nut on the bolt, rigid legs close to the control side of the switch from normally open to normally closed, the relay K509 pull, PLC input Side X17 produces the input signal, the program can be programmed: LD X17, ANI X20, OUT Y16, then the control unit S9 of the rigid-legged inverter inputs the deceleration control signal, the four motors on the rigid leg side immediately decelerate, The soft leg side of the proximity switch is also detected on the bolt nut, it automatically disconnect the S9 input signal, so that just, soft leg side of the motor and the same speed and stable operation;

fifth, concluding remarks

Large-span gantry crane electrical automatic correction methods are also many, such as the use of global positioning system GPS, etc., but the installation and maintenance costs are relatively high. The advantages of this program is simple circuit, the deviation of the sampling part with the sensor nut 5-20mm away from the normal work can be close to the electromagnetic switch, the switch protection level is greater than IP67, no rotation, friction parts, long life, installation and commissioning Maintenance is very convenient.

For more details, please contact us via info@nucleoncranegroup.com

- See more at: http://www.nucleoncranegroup.com/long-span-gantry-crane.html

types of gantry cranes-nucleon crane group

types of gantry cranes

Four types of gantry cranes

1.General gantry crane:

This crane is the most widely used, can handle a variety of pieces of goods and bulk materials,the weight below 100 tons, the span of 4 to 35 meters. General gantry crane with grapple work level is higher.
2.Hydropower gantry crane:

mainly used for lifting and opening closing gates, but also for installation operations.Lifting capacity of 80 to 500 tons, a smaller span, 8 to 16 meters; lifting speed is low, 1 to 5 m / min. Although this crane is not often lifting, but once the use of work is very heavy, it is necessary to properly improve the work level.
3.Shipbuilding gantry crane:

for the ship’s hull assembly, standing with two lifting trolley:One with two main hooks, running on the rails of the bridge flange;From the weight is generally 100 to 1500 tons; span of 185 meters;Lifting speed of 2 to 15 m / min, there are 0.1 to 0.5 m / min fretting speed.
4.Container gantry crane:

for container terminals. Trailer The container unloading container from the ship to the yard or rear, by the container gantry crane stacking or direct loading, can speed up the container carrying bridge or other crane turnover.
Stackable high 3 to 4 layers, 6 rows wide container yard, generally with the tire type, but also useful rail type. Container gantry crane compared with the container straddle, its span and mast height on both sides are large.
In order to meet the transport needs of the port terminal, the crane’s work level is higher.Lifting speed of 8 to 10 m / min,The span is determined by the number of container rows that need to be crossed,A maximum of about 60 meters corresponds to 20-foot, 30-foot, 40-foot long containers weighing approximately 20 tons, 25 tons and 30 tons respectively.
5.Carrying bridge crane:

By the gantry crane to expand the span to the development a bridge crane, also known as loading and unloading bridge. For open storage yard, ports and railway cargo terminals.The general carrier bridge is similar in structure to the large gantry crane.
Features are: (1) mainly for bulk material handling object② large span, generally 30 meters or more, and some up to 170 meters; ③ frequent operations, high productivity, generally 500 to 1500 tons / hour, high speed, lifting speed of 60 to 70 m / min, Speed of 100 ~ 350 m / min, the higher the level of work.
④The operating mechanism of the bridge is only used to adjust the working position, and it is a non-working organization. When the span is large, the bridge of the carrier bridge is supported on a rigid leg and a flexible leg.Bridge and two legs can be bolted; and flexible legs can also be connected through the ball hinge or column hinge,So that the flexible leg can be deflected to a certain extent relative to the bridge.The bridge consists of a trussed beam that runs on the track of its upper or lower chord.Some have rotary boom, be equivalent to a frame running in bridge crane boom type.

The container-carrying bridge, which runs on the shore of the harbor, is a special structure of large cranes,Dedicated to the ship’s container handling work.
Both sides are generally rigid outrigger, forming a solid mast which is supported on an upper frame integral with the gantry crane.Trolley with a container spreader (see the straddle car) running on the bridge. Long cantilevers extending towards the sea are usually pitchable. Non-operating state, the cantilever can be hoisted at 80 ° ~ 85 ° elevation.So that the bridge over the ship to the highest point. Operation cantilever flat. Some cantilevers are also fixed.

- See more at: http://www.nucleoncranegroup.com/types-of-gantry-cranes.html

2017年1月23日星期一

The installation of 10 ton Electric winch

The installation of 10 ton Electric winch

China Nucleon Crane Group

#Web http://www.nucleoncranegroup.com/electric-winch.html

#Contact Skype:nucleoncranegroup OR Email:info@nucleoncranegroup.com

Variable Frequency Speed Bridge Crane-nucleon crane group

Variable Frequency Speed Bridge Crane

Practical Application of Variable Frequency Speed Regulation Technology in Bridge Crane

1 Introduction

Bridge Crane in industrial and mining enterprises have a wide range of applications, mainly used to achieve the object movements and transport. Alumina industry distribution department packaging workshop bridge crane, a device every day into and out of aluminum oxide powder amounted to more than 2,000 tons, the use of frequent, heavy workload, and the environment is bad (with alkaline corrosion dust). Bridge crane can directly affect the normal work of the packaging workshop production efficiency and the completion of the task, and even related to the personal, equipment safety.

2 issues raised

The Department of the packaging plant used the original bridge crane drag system with winding AC induction motor, the rotor loop into the multi-level external resistor to grading speed, the use of cam controller, relay contactor control, which Speed regulation is simple, but there are many shortcomings:

(1) winding rotor resistance of the mechanical characteristics of the speed control soft, slow speed performance;

(2) series resistor speed control is a step-speed mode, through the contactor to complete the division of the rotor series resistance switch, which adjusts the motor speed, resistance switching will be on the power grid and the crane mechanical parts Unavoidable impact;

(3) The main circuit in the use of positive and negative contactor to achieve the motor commutation, the actual operation of the bridge crane operator in order to adjust the working condition, the frequent use of reverse braking (commonly known as playing anti-car), switching current, And the motor working condition is bad, equipment maintenance cost is very high;

(4) Crane start, the speed of the rotor when the string resistance is pure energy-consuming components, waste a lot of power. In addition, due to the speed resistance of the restrictions, narrow speed range, starting torque is small, extended start time, affecting production efficiency;

(5) the system brake is carried out in the state of motion, the brake is damaged, brake wear serious.

In view of the actual production problems, decided to implement the packaging crane bridge crane by the new linkage, PLC and high-performance frequency control devices consisting of the overall technological transformation solutions.

3 system transformation program implementation

3.1 System Configuration

Packaging workshop bridge crane electric drive system with cart motor 7.5kW × 2 units, car motor 2.2kW × 1 units, winch motor 15kW × 1 units. Implementation of the technological transformation program uses three sets of frequency converter control of four motors, including hoist motor and car motor with an ACS800-01-0040-3 and ACS800-01-0005-3 inverter drive, cart two motors Then use an ACS800-01-0030-3 inverter drive, to achieve synchronous operation, each inverter configuration of the energy consumption of braking components, the location of potential energy and braking energy consumption. System configuration Siemens S7-200 small programmable logic controller constitutes the center of the entire control system, configure the new linkage control console to replace the original cam controller, to achieve system operation.

3.2 The main features of the control system

(1) the original four AC induction motor rotor center point directly shorted, all the rotor circuit of the cable, resistors, frequency sensitive rheostat and contactor all canceled.

(2) in the traffic upload 3 stainless steel control cabinet, protection class IP54. The winch frequency conversion control cabinet is one, the big, the car frequency conversion + PLC control cabinet one, the brake resistance cabinet one, the stainless steel cabinet has realized the anticorrosion, the moistureproof, the dustproof goal, adapts the alumina profession to have the corrosive dust harsh working environment request.

(3) The frequency changer chooses ABB ACS800 series high performance frequency changer, the frequency changer system which controls the winch motor uses the hoist application macro, the control big, the small car electrical machinery frequency changer system software selects the standard application macros.

(4) PLC selection SIEMENS S7-200 series, the control handle issued to the PLC to open, stop, fast, slow, upgrade, decentralization and other instructions, the corresponding PLC command to control the inverter forward and reverse speed, in order to achieve Optimal Control of Bridge.

(5) When the inverter generates the braking torque, the motor receives the mechanical energy from the load and turns it into the electrical energy into the inverter, which causes the DC voltage to rise. At this moment, the inverter must deal with this part of energy, otherwise the DC circuit capacitance Over-voltage protection action will stop its operation, so the inverter DC circuit set braking unit and braking resistor, the crane in the descending brake release of energy consumed in the braking resistor.

(6) PLC according to the control procedures, input control signals and upgrade, decentralization and other instructions to complete the various conditions of the crane coordination and control.

(7) linkage console has two, multi-speed control.

Winch linkage console: Winch independent control of a single handle operation, has to improve fast, medium and slow third gear speed, decentralized fast, medium and slow third gear speed, and parking and other items.

Large and small car linkage console: large car sharing a handle operation for the full range of operating handle, you can control large and small cars, also have fast, medium and slow and stop control functions.

3.3 system fault protection and fault diagnosis of the main features

The inverter has perfect protection functions for the motor and the inverter itself, such as overheating, overload, overcurrent, overvoltage, phase loss, grounding, etc., so as to avoid equipment from abnormal operation for a long time and protect equipment from damage.

In addition to fault information can accurately indicate the point of failure, but also shows the cause of the failure and troubleshooting measures, which greatly facilitates the maintenance staff troubleshooting.

Operation in the event of failure to stop operation is also very simple to reset operation, as long as the failure to press the fault reset can be.

4 after the transformation of the control system to achieve the actual results

(1) the use of frequency control after the transformation to achieve a smooth speed, and the efficiency is extremely high, and the original series resistor speed mode, start more stable, more accurate positioning;

(2) The system is controlled by the control handle to the output of the inverter, adjust the motor speed, easy operation, speed range, can be set to run speed;

(3) ABB inverter and dedicated hoist application macro are used in the system to realize the full torque output (up to 300% of rated torque) of the inverter at zero speed and the internal integrated brake logic control, Improve the stability and reliability of system application;

(4) winch, the size of the car starting, braking, acceleration, deceleration and other processes more stable and fast, more accurate positioning, energy-saving effect is obvious, according to test energy-saving rate of up to 35%;

(5) the control loop is simple, to achieve a soft start, soft stop, no impact on the gear, the motor, low failure rate, easy to maintain, greatly reducing maintenance costs;

(6) As the system has further functional expansion of the interface, according to the actual needs of the future expansion of wireless remote control, field bus communication and other functions;

(7) from the transformation put into operation 1 # packaging plant 2 bridge crane situation, a good solution to the motor starting and stopping the impact of current, coupled with the motor to improve the protection of the motor, Greatly improving the reliability of the traffic and safety, extended service life.

5 Conclusion

Since the system has been put into operation, it has achieved the expected purpose of reforming, and its operation is good. It has excellent speed performance, stable starting, accurate positioning, safe and reliable operation, simple operation, remarkable energy saving and small size. It has wide application in the same industry. value.

- See more at: http://www.nucleoncranegroup.com/variable-frequency-speed-bridge-crane.html

2017年1月22日星期日

Long Span Gantry Crane-nucleon crane group