Electrical Protection System of Double Girder Gantry Crane

Short circuit protection: the main power supply circuit is equipped with automatic air switch as the short circuit protection of crane; the control circuit is set with small capacity automatic air switch as short circuit protection.

Loss of voltage protection: the circuit structure has the function of voltage loss protection. When the power supply is restored after power failure, the crane can only run again by pressing the start button again, thus eliminating the possibility of self operation when the crane is powered on.

Emergency power-off switch: the crane is equipped with a red mushroom head rotary reset emergency power-off switch, which is used to quickly cut off the main power supply and control circuit of the crane in emergency. The emergency power-off switch shall be installed at a place convenient for personnel to operate.

Overload limiter: when the load reaches 90% of the rated lifting capacity, it will send out a prompt alarm signal. When the load reaches 110% of the rated lifting capacity, it will immediately cut off the lifting power supply and send out a prohibitive alarm signal. The sensor of overload limiter has the characteristics of moisture-proof and anti-seismic. The sensor is connected with the control box to reduce the interference of sensor signal.

MG32T double girder gantry crane
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Travel switch: the lifting mechanism is equipped with ascending and descending fire break limiters. As the limit switch of lifting mechanism lifting range, it also has the protection function against the adhesion of the controller; the crane mechanism is equipped with operation limit limiter, which is composed of travel limit switch and safety ruler. The travel limit switch is installed on the crane, and the safety ruler is installed on the rail bearing beam or wall where the crane is running, the crane can be operated within the safe range; the crane limit limiter can be either an ordinary limit switch or a photoelectric switch or a laser anti-collision device with higher performance, smaller volume and more accurate limit distance.

Zero position and interlock protection: air operated crane has zero position protection and interlock protection function of door switch. The zero position protection function prevents the occurrence of motor automatic operation when the crane recovers power supply after power failure and prevents accidents. The interlock of door switch can avoid the occurrence of people or objects falling from the door because the safety door on the crane is not closed and the cart suddenly runs.

Protection of phase failure, phase staggering, over-voltage and under-voltage: the integrated protector in the crane circuit system has the protection functions of phase failure, phase staggering, over-voltage and under-voltage. When the above four situations occur, the general power supply of the crane will be automatically cut off to prevent personal injury and equipment damage.

Grounding protection: the metal mechanism of crane and all electrical equipment metal shell, pipe groove and low voltage side of transformer are provided with reliable grounding, and the total grounding resistance is less than or equal to 4 Ω, and the crane rail is allowed to be used as the grounding wire. The insulation resistance of crane to ground at normal temperature shall not be less than 1m Ω (this value is the measured value of 500V meg-ohmmeter at room temperature).

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Gantry Crane Types

AQ-MH electric hoist gantry crane: simple structure, low purchase cost, must be used with the hoist products. Generally, the lifting capacity is 3-20t, the span is 10-35m, the working level is A3, and the working environment temperature is – 20 ° C-40 ° C. It is widely used for handling and loading in open places and warehouses. Its operation modes include ground wired handle, ground wireless remote control, cab operation and the combination of two operation modes. Because of its low working level, it can not be used in places with large lifting capacity and frequent work.

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AQ-MDG single girder gantry crane (or L-type gantry crane): mainly composed of gantry crane, crane operation mechanism, trolley assembly and electrical equipment. It is mainly applicable to open warehouse, freight yard, outdoor equipment production site and cargo handling, etc. Generally, the lifting capacity is 5-32t, the span is 10-35m, the working level is a5-a6, and the working environment temperature is – 20 ° C-40 ° C. The operation modes include ground wireless remote control, cab operation and the combination of two operation modes.

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AQ-MG double girder gantry crane: mainly composed of gantry crane, crane operation mechanism, trolley assembly and electrical equipment. It is mainly applicable to open warehouse, freight yard, outdoor equipment production site and cargo handling, etc. Generally, the lifting capacity is 5-600 tons, the span is 18-35m, the working level is a5-a6, and the working environment temperature is – 20 ° C-40 ° C. The operation modes include ground wireless remote control, cab operation and the combination of two operation modes.

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U-type double girder gantry crane: mainly composed of gantry crane, crane operation mechanism, trolley assembly and electrical equipment. It is mainly applicable to open warehouse, freight yard, outdoor equipment production site and cargo handling, etc. Generally, the lifting capacity is 5 ~ 50t, the span is 18 ~ 35m, the working level is a5-a6, and the working environment temperature is – 20 ° C ~ 40 ° C. The operation modes include ground wireless remote control, cab operation and the combination of two operation modes.

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Container gantry crane: used for handling and loading of international standard containers, mainly composed of gantry crane, crane operation mechanism, trolley assembly, electrical equipment, container spreader, spreader anti sway device, etc. According to different crane operating mechanism, it can be divided into rail type container gantry crane (RMG) and tire type container gantry crane (RTG). It has a lifting capacity of 30.5t, 35t, 40.5t, 45t and 50t, a span of 20-40m, a working level of A6, and a working environment temperature of – 20 ° C-40 ° C. The operation mode is mainly cab operation.

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Shipbuilding gantry crane: it is used for shipbuilding operation in the manufacturing site (dock and dock) of the shipyard. It has single lifting, double lifting, three lifting and air turning lifting parts, which are used for the process of hull lifting and hull turning. The lifting capacity is 2×50 + 100 tons, 2×75 + 120 tons, 2×100 + 200 tons, 2×150 + 250 tons, 2×300 + 450 tons, with a span of 50-230 meters and a working level of A5. The operation mode is mainly cab operation.

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Inspection of Crane Lifting Mechanism

The lifting part of crane is the most important part of crane inspection and maintenance, because it directly affects the frequency of a crane accident.

General steps of crane lifting mechanism inspection:

  1. Check the drum surface for wear, surface lubrication, wire rope jumping, drum rust, etc.
  2. Check whether the steel wire rope has defects, damages, broken strands, broken wires, loose strands and other phenomena, and check whether the pressure block of the steel wire rope is loose.
  3. Whether there is any damage on the outside of the hook, whether the bolts are loose, whether the safety buckle is in good condition, and whether the hook head rotates freely.
  4. Check whether the lifting limit switch is fixed, whether the lock nut is tight, and whether the functions and wiring of the limit switch are loose.
  5. Check whether the fixing of the lifting motor is reliable, whether the wiring inside the junction box is firm and whether there is noise when the motor is running.

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Preparation before Crane Operation

  1. All aspects of preparations must be done before lifting operation to prevent accidents due to unexpected situations. The contents of operation preparation are: preparation and inspection of lifting appliances, including wire rope, shackle, clamp, basket, etc.; preparation of auxiliary appliances, including skid, crowbar, wire hook, etc.; determination and cleaning of the falling place, which shall be flat and spacious.
  2. The contact signal is the bridge between the driver and the crane operator. Many accidents are caused by information exchange errors. Therefore, both ground command signal and crane warning signal shall be contacted according to the specified standards. In particular, the crane driver can only operate after confirming the command signal, hanging status, operation channel and landing space.
  3. Before binding components or equipment, the appropriate binding point shall be determined according to the shape and center of gravity position; secondly, the angle between the steel wire rope and the horizontal plane during lifting shall be considered for binding heavy objects, and in the case of stress, the angle shall be 45 °. Then when binding the objects with edges and corners, board, tire, sack and other objects shall be padded to avoid damage to the steel wire rope. Next, it is necessary to consider whether it is convenient to remove the lifting object when binding the heavy object, and whether the sling will be pressed or damaged after the heavy object is placed in place; finally, when lifting various spare parts, it is necessary to adopt suitable clamps to ensure stable lifting.

In the process of crane lifting, the area endangered by the impact, swing and fall of the crane is called the dangerous area. In the operation, the operators are often in the dangerous area. Therefore, it is very important to choose the safe location according to the characteristics of the dangerous area under the specific conditions.

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Characteristics of Rail Container Gantry Crane

1. Lower lifting speed and higher crane running speed.According to the demand of container yard, the lifting height of rail type container gantry crane is determined by stacking three over four or stacking four over five. Because the lifting height is not high, the lifting speed is relatively low. However, the length of the container yard is generally long along the running track direction. In order to achieve a certain productivity, the crane runs at a high speed.

2. The running speed of the trolley can be determined according to the span of the bridge and the extension distance of both ends. When the span and cantilever length are small, the running speed and productivity requirements of the trolley can be relatively small. When the span is large and the length of the cantilever is large, the running speed of the trolley can be correspondingly increased to meet the productivity requirements.

3. When the span is more than 40m, due to the different running resistance of the legs on both sides of the gantry, there will be offset during the high-speed operation of the gantry. Therefore, a synchronization device is set to keep the running speed of the running mechanisms on both sides synchronized through the electrical control system.

4. In order to meet the higher requirements, the electric drive control system adopts thyristor DC or AC speed regulating drive control system to achieve better speed control and control performance.

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Gantry Crane Specification

Gantry crane specification plays a vital role in installing and maintaining the crane, and the gantry crane’s service life is likely to be extended by complying with the crane specifications strictly.

1. Product Description

Different from bridge crane, gantry crane achieves its lifting work by supporting several legs on the ground, which is free from the limitation of plants. Consisting of main frame, cab, trolley travelling system, crane travel equipment, electric control system, etc. gantry crane system is of large span and large lifting capacity.inquiry

2. Main Application

This kind of product is widely used in different kinds of places such as rail-way lines, warehouses, docks, material yards, shipyards, container ports, etc. Nowadays, it has been regarded to be the necessary machinery equipment of improving the labor conditions and efficiency.

It mainly used with different types of electric hoists or lifting hook for general lifting purposes, if it is necessary to use in other special environment, please contact us, we can provide best solution to you.

3. Gantry Crane Specifications, Models&Structure

  • Gantry Crane Specifications:

·Lifting Capacity: 0.5~200t
· Span Length: 3~35m
· Lifting Height: 2.5~18m
· Working Class: A2~A6
· Structure: Box-shaped or Truss Crane

  • Gantry Crane Models:

· Single Girder “A” Leg Electric Hoist Gantry Crane
· “L” Leg Single Girder Gantry Crane
· “U” Leg Double Girder Gantry Crane
· “A” Leg Double Girder Gantry Crane
· Single Girder Electric Hoist Semi Gantry Crane
· Double Girder Semi Gantry Crane
· European Electric Hoist Gantry Crane
· Adjustable Gantry Crane(Small Gantry Crane/Portable Gantry Crane)
· Single Girder Truss Gantry Crane
· Double Girder Truss Gantry Crane

4. Transmission Structure&Operating Principle

  • Lifting Trolley

Hoisting Mechanism
Hoisting mechanism mainly consists of driving device, wire rope coiling system, loading device, and safety protection devices. Among this, driving device contains electric motor, gear reducer, brakes, group reel, and couplings, which drives the whole machine operating.

Trolley Travel Mechanisms
Travelling mechanism drives the trolley move, generally, it is mainly featured of low speed shaft.

  • Gantry Frame

Frame gantry is composed of main beam, end beam, bottom crossbeam, supporting legs, trolley track, platform, handrail, cab, and stepladder, etc. They are made up of the basic foundation of one gantry crane.

· Main Beam: Generally, applying Q235B model material of the beam is for the purpose of staying rigidity and stability.
· End Beam, the main beam and end beam is connected by high-strength bolt to ensure its safety, every bolt is marked before delivery.
· Supporting Leg: Adopting the rigid leg and flexible leg when the span length of the crane exceeded to 35 meters, it can improve the flexibility and affordability of the whole set.
· Bottom Crossbeam: To increase the carrying capacity of the crane, it is connected by high strength bolt to protect the crane’s stability.
· Cab: the arrangement of cab’s setting are fully considered of operator’s safety, easy-operating and maintenance.

  • Crane Travelling Equipment

· The crane gantry achieves its separating travel by the supporting of wheels。
· The structure of crane’s driving mechanism is convenient to the installation, maintenance and disassembling.

  • Electrical Control System

· Three-phase voltage or customized by the clients’ demand.
· Power supply mode: sliding cable lines, cable reels, or diesel generation.
· The circuit structure for the function of out-voltage protection.

5. Installation&Debugging

  • The operator must install the crane with its qualified license.
  • Practical setup project should be scheduled before installation.
  • Debugging the machine after installing the crane, rectify and debug until it come up to the national standard.

6. Test&Examination

  • Inspection and acceptance of the structure, basic dimension of the crane at buyer’s site.
  •  Testing loading capacity after installation and debugging, going approval rating and filling in the inspection report.

7. Safe Operation

The qualified operators should operate the gantry crane according to the safe specifications strictly in order to protect the crane safety.

8. Equipment Maintenance

Carrying out routine maintenance according to maintenance plan, ensuring the crane is in line with safety requirements.

Besides, our company can help the customer do crane repair if it is necessary.

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What is a Gantry Crane

What is a gantry crane? Speaking of gantry crane definition, as the deformation of the overhead cranes, it is a gantry lifting equipment that used in different working occasions, such as container port, shipyards, dock, offshore, etc. For its appearance and structure looks like a portal or a gate, it has been called gantry crane.

The Basic Component and Structure of a Gantry-crane

What is a gantry? A crane gantry mainly consists of bridge, supporting legs, electric control system, crane travelling system, trolley travel mechanism, lifting organ, cab, etc.

1. Basic Frame of A Gantry Crane

The basic frame of gantries such as main beam and supporting legs are composed of box-shaped or truss structure. Different structures are of their own advantages. Box-shaped crane is for the advantages of strong-rigidity and easy-maintenance, while the truss-shaped structure is of strong wind-resistance ability but light lifting capacity.

2. Electric Control System

Electric control system in gantry mainly refers to gear reducer, brakes, electric motor, etc. The three of them controls the travelling of the trolley machines and cranes.

SEW motor
SEW motor

3. Crane and Trolley Travelling Systems

Crane travelling system and trolley travel mechanisms can achieve running once energized. And there are three power supply mode of gantries, cable reels supply, diesel generators and sliding wires supply.

We adopt to advanced level wheels in the crane. All wheels are of compact structure and smooth moving, which ensure the smooth operation and high-safety of the whole set.

Trolley Specifics of Ellsen Machinery
Trolley Specifics

4. The Settings on Cab

Ground operation and air operation are two forms of gentry crane. In order to decrease the labor intensity and guarantee safety of the operators, it is necessary to build a cab on the crane, besides, operators control in the cab can also increase the accuracy of the goods and materials handling.

Gantry Crane Cab
Gantry Crane Cab

Gantry Crane Features and Advantages

1. Widely used in outdoor and indoor places for material handling works.
2. Compared with overhead crane, gantry crane is of low demand on the plants.
3. Once exceed to 30 meters in span length, flexible leg and rigid leg need to be set to improve the safety of gantries.
4. Ground sill is required in heavy-duty gantry cranes.
5. Cantilever cranes need to be used with saddle to improve safety.

Gantry Crane Innovation&Breakthrough in Technics

1. Our electric control system adopts to the advanced lever ABM three-in-one or SEW three-in-one motor, which proves the integration of gear reducer, brakes and electric motor.
2. Advanced buffer and intelligent overhead limiter ensure safety operation.
3. First-class emergency shutdown system in our Gantry crane.
4. Guard net in trolley travelling mechanism to protect safety.
5. European type crane and electric hoist can be matched to enhance working efficiency and extend lifetime services.

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