Semi Gantry Cranes is a small or middle crane, widely used in mechanical processing workshops for materials handling, outdoor place, and warehouse for loading and unloading.
|Lifting Capacity||2 to 80 tons|
|Lifting Height||Custom lifting height|
|Span||8 m to 20 m|
|Lifting speed||6 to 11.5m/min|
|Trolley running speed||20 to 40m/min|
|Crane running speed||20 to 40 m/min|
Semi Gantry Crane is a kind of crane material handling equipment that runs on rails, which can be used outside the factory building for loading and unloading materials.
Bridge cranes are usually used inside the plant, but if your plant uses a bridge crane, or because the steel structure of the factory can only be installed on one side of the steel structure, then this kind of semi-gantry crane can be used instead for a long time.
Since one side of the semi-gantry crane needs the top steel structure to support, the requirements for the multi-user environment will be higher than other overhead cranes, such as gantry cranes or overhead cranes.
What can we offer you?
We can provide you with a common semi gantry crane with a lifting weight of 1 ton to 80 tons, a span of 8m to 20m, a lifting height of 6m to 20m, and working duty (A3, A4, A5, A6).
The above semi gantry crane parameters are only common parameters if they can’t meet your needs.
WeiHuaCrane also provides customized design gantry crane services you can leave your needs, our designers will design the best material handling equipment for you.
The main purpose of Semi Gantry Crane?
Semi Gantry Crane is a kind of light and small material handling equipment that runs on rails.
Main places of use: material handling on different occasions such as mechanical production workshops, factories, warehouses, stockyards, etc.
Semi gantry cranes cannot be used in special flammable, explosive, and corrosive environments (special material handling equipment).
If you are in a special industry, please write down your industry when you leave a message, and our engineers will customize a gantry crane that meets your industry standards.
- The crane has simple and compact structure;
- It is easy to install and operate;
- It needs less and easy maintenance;
- It has light dead weight;
- It can be customized according to special work needs;
- The crane works reliably and efficiently without failure during lifting work;
- It can be used for many different work occasions, including indoor and outdoor occasions;
- The crane is supplied with very reasonable price.
Semi-gantry cranes can be used in stations, wharves, warehouses, freight yards, construction sites, cement products yards, machinery or structural assembly yards, hydropower stations, and other open-air work sites for lifting, transportation, loading, and unloading, and can also be used in indoor workshops.
Main Structure and Feature
The semi gantry crane is mainly composed of four parts: bridge frame, cart operating mechanism, hoisting mechanism, and electrical.
The bridge frame of the semi gantry crane is mainly composed of the main girder, upper girder, lower girder, outrigger, and ladder platform.
- The main girder of the semi gantry crane is the main load-bearing component of the hoist crane, and it is also the running track for the suspension of the electric hoist
- The main girder of the semi gantry crane is formed by welding a U-shaped groove formed by cold bending of steel plate and I-steel.
- The steel plate material of the semi gantry crane is Q235B or Q345B (similar to foreign steel Fe37 or Fe52)
- The camber F of the main girder of the semi gantry crane should be (1/1000～1.4/1000)S, and the maximum camber shall be within the range of S/10 in the middle of the span.
- The electric hoist trolley of the semi gantry crane runs on the I-beam flange. When the hoist is in the middle of the main girder, the full-load natural vibration frequency of the main girder is not less than 2Hz.
- The two ends of the main girder of the semi gantry crane are equipped with buffers to ensure the safe operation of the trolley on the main girder.
Upper beam, lower beam
- The upper and lower beams of the semi gantry crane are the foundation for supporting the main beam and the load, as well as the link between the main beam and the running mechanism, and are one of the main load-bearing components of the crane metal structure
- The semi gantry crane is mainly tailor-welded by steel plates into a box-shaped structure, which is light in structure, good in rigidity, beautiful in appearance and good in welding process performance
- Buffers are provided at the end of the beam of the semi gantry crane
- The upper beam of the semi gantry crane is arranged above the upper rail, and the lower beam is arranged above the lower rail.
PS: Generally, the lower beam is longer than the upper beam, and the difference in length depends on the length and angle of the outriggers.
- The outriggers of the semi gantry crane are composed of upper flange, lower flange and box-shaped support columns assembled by steel plates.
- The upper flange of the semi gantry crane is large and the lower flange is small, so that the outriggers become a variable cross-section structure with a large upper and a small lower section, which can effectively carry vertical and horizontal loads.
- The main beam and the upper cross-end beam of the semi gantry crane are contacted by a bolt plus/minus load flange hanging contaction structure. The structure is simple, the installation is convenient, and it is convenient for transportation and storage.
- The main girder of the semi gantry crane and the two legs symmetrically arranged on both sides of the main girder are fastened by bolts to the two flanges, and the two legs are narrowed up and wide down to form a certain angle to form an “A” The font structure improves the stability of the crane.
- The outriggers of the semi gantry crane and the lower beam are contacted by bolts.
The ladder platform of the semi gantry crane is welded by angle steel, flat steel, round steel, etc., and is contacted with the angle steel welded on the outrigger through bolts, avoiding on-site welding and making it easy to disassemble.
Crane Travelling Mechanism
The trolley running mechanism of the semi gantry crane is driven separately, which is mainly composed of a running motor, a running reducer, and a wheelset. The whole device is simple in structure, small in size, low in noise, generous in appearance, safe and reliable in use, and convenient in installation and maintenance.
The trolley running mechanism of the semi gantry crane adopts the ZDY series brake type motor, and the motor has its own brake for reliable braking. The motor is arranged above the lower beam to save space.
The trolley running mechanism of the semi gantry crane adopts the LDAC or LDHC type vertical “three-in-one” reducer + open gear transmission type, the reducer is small in width, and there is no coupling.
- The trolley running mechanism of the semi gantry crane adopts LDA type wheels with double wheel edges, which is not easy to cause the wheel climbing and falling off the track.
- The end baffle of the cross beam of the trolley running mechanism of the semi gantry crane is contacted by bolts, which is detachable and convenient for installation and maintenance.
- The electrical part of the semi gantry crane adopts a pressure type lifting limiter, an alarm point is set, the sensor is directly installed on the wire rope, and the original wire rope structure is retained. The control instrument can be installed together with the sensor, or separately installed in an electrical cabinet or other Location
- The electrical part of the semi gantry crane is easy to install and debug, stable in quality, intelligent, and small in size.
Power supply mode
(1) safety slide wire
(2) soft cable
(3) cable drum
(1) cable pulley
The slideway of soft cable and cable pulley could be wire rope slideway, I beam slideway or deformed steel slideway.
Wire and cable
Wire and cable with Copper, multistrand and insulating sheath used all over the crane
Multistrand single cable, whose cross-area of control wire≥1.5mm2 and 1.0mm2 multistrand multicore cable, cross-area of power line≥2.5mm2
The cables set in trunkings or tubes with a thickness of 1.5mm~2mm
Protection devices at the parts of mechanical injury, chemical corrosion, or soil erosion
Pendant: control the actions of all mechanisms by pressing the buttons
Remote control: control the actions of all mechanisms with industrial remote control
Cabin control: control the actions of all mechanisms with the buttons, master switches, cam controller, or linkage in the cabin
The crane could also have two sets of control devices, such as pendant + remote control or cabin + remote control. Two control modes could not be used together for safety.
Electric protection system
Short circuit protection
Automatic air-breaker switch in main power circuit as short circuit protection of the crane control circuit.
The circuit structure has Voltage-loss protect function, the start button must be repressed to restart the crane when power restoration after breaking in case of the crane automatic operating.
Emergency power switch
- Rotating reset type emergency power switch like a red mushroom used for switching off power quickly in emergency condition;
- Emergency power switch set in convenient place.
Overload limiter will send a hint alarm signal when the load reach 90% rated capacity
The power for lifting will be cut together with a prohibitive alarm signal when reaching 110% rated capacity
The sensor is linked with the control box, moistureproof and anti-seismic, anti-interference.
Fire limiter in lifting mechanism as the switch to limit the lifting height, at the same time, protect the controller
Traveling limiter in crane traveling mechanism, composed of traveling limit switch on the crane and safety rule at the place get out of the crane travel, ensure the safe travel of the crane.
A wind-proof rail clamp is installed at one end of the ground beam when used outside. Limit switch on rail clamp interlocks with main power switch, that is to say, the crane could not start when it is locked on the rail by rail clamp.
Zero position and interlock protection
The cabin control crane has zero position and interlock protect function
Zero position protection prevent the motor automatic operating when restoring power after power off, avoiding accidents
The interlocking of the door and switches avoid accidents like people or objects falling down from the door when the crane starts suddenly as the door opens.
Three-phase fault & voltage fault protection
Comprehensive protection in-circuit system will cut off main power automatically when three-phase fault or voltage fault in case of damaging people and equipment.
Metacor of crane and metal shell, raceway, the low side of the transformer of electric equipment all have grounding. Total grounding resistance≤4Ω, and the crane rails could be as a ground wire. Insulation resistance to ground≥1MΩ at normal temperature (it is a measured value of 500V megger at normal temperature).
Semi Gantry Crane Parameters
|Capacity||Span||Lifting height||Lifting speed||Trolley speed||Crane speed||Work duty||Track type|
|16 ton||12~30||6~12||7.9||40.1||40.1||A3~A6||P43 QU70|
|20 ton||12~30||6~12||7.2||40||40.1||A3~A6||P43 QU70|
|32 ton||12~30||6~12||6||37||38||A3~A6||P50 QU80|
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