The KKS-10 gantry crane, the technical characteristics of which we will consider later, is an improved version of the KKU-10 console predecessors. The unit is designed for storing assortments in stacks and loading them onto rolling stock. The metal structure of the loader is made of a supporting truss, rigid and flexible supports. The first element is a lattice fixture with a rectangular section, consisting of five sections. They are interconnected by bolting.
Device
Taking into account the technical characteristics of the KKS-10 gantry double-gantry crane, the supporting truss holds the monorail, which is suspended on bolts. A freight cart and an operator’s cabin move along it. In the inner part along the working belt, a special flooring is laid, used for the passage of maintenance personnel. The rail is made of an I-beam, with reinforcement of the lower part in the form of a steel strip.
The right console has two repair surfaces. They are placed in such a way that when installing the cabin opposite the landing pad, the position of the cargo trolley between technical points is ensured. The left console is two meters longer than the right counterpart. This ensures the same hook outreach in the extreme positions of the cargo cradle on both elements.
Design features
According to the technical characteristics of the gantry crane KKS-10, both of its supports are made with a pair of racks. The upper edges of the elements are connected to the supporting truss, the lower ends are supported by four running carts with one wheel. Two of them are drive type. The cradles are located diagonally, which allows to increase the conditions for moving the unit during acceleration and braking.
Between themselves drive and accompanying carts are aggregated using special screeds. The free interior space of 8500 millimeters at the maximum lifting height of the load makes it possible to move materials up to eight meters long without turning the bundle, shifting them from one console to another. Longer loads must be deployed at right angles while skipping past the support. All racks are equipped with a flange connector, which serves as a separator of elements on the upper and lower parts, which is required for the installation of the loader.
Work items
The design, structure and technical characteristics of the KKS-10 gantry crane are designed for the use of rigid support racks. They are designed in the form of lattice truss elements with a triangular cross section increasing upward. Supports of flexible type are reinforced with channel belts. The part is connected to the farm using hinges, which makes it possible to provide some displacement relative to the base if there is a violation of the track gauge of the railway track.
A rigid connection of the supports with the bearing unit is provided by struts. On the flexible part, a staircase with a fence is provided, ending with a sedimentary platform, which serves to enter the cabin. The base is a channel configuration frame. An electric motor is mounted on it, which imparts a torque to the running wheel by means of a cylindrical dual-mode gearbox and an open gear. A high-speed brake pulley is mounted on the high-speed shaft. The bracket of the inclined flange is attached to the frame by welding, with further connection to the lower end of the support. An axle is provided in the cheeks of the bracket for fixing the mounting tackle. An anti-theft capture rack is welded on the reverse side.
Chassis
We study the technical characteristics and the device of the gantry crane KKS-10 in terms of running parts. The main wheel is stably fixed in the bores of the channel sections of the frame. A gear analogue of an open gear is mounted on the axis of a pair of spherical roller bearings.
The drive gear is constantly engaged with the wheel rim. The shaft rotates with a pair of bearings that are connected to a low-speed element of the clutch gearbox. The protective casing acts as a protection for the rotating parts of the drive cart.
Lifting and storage mechanisms
Next, we consider the description and technical characteristics of the gantry crane KKS-10 in terms of attachments for lifting the unit. They are a single-drum winch configuration with an electric drive.
On the mechanism there are two oncoming grooves on which the turns of the branches of the hoisting rope are placed. Shoe type brake mounted on high speed gear shaft. A gear is fixed at one end of the drum, which facilitates the transformation of rotation to the screw of the control switch. He is responsible for the maximum height of the hook.
In accordance with the technical characteristics of the KKS-10 gantry crane, when the screw rotates, its nut receives a longitudinal movement. A certain number of turns corresponds to the maximum boundary height of the hook, the nut aggregates with the pin of the final distributor, which turns off the motor, while the brake stops the lifting device.
The unit’s storage system includes rope branches that go off the drum, bend around the static pulley blocks, are fixed on the traverse with a central hook and a pair of side slings for throwing slings. Such a scheme of storage allows you to avoid distortions on the relatively far apart parts of the chain hoist when working with goods with a shifted center of gravity.
Technical characteristics of the gantry crane KKS-10
Features of the unit under consideration:
- The load rating is 20 or 30 kN, depending on the meter span.
- Departure of consoles in working condition - 8/9 meters.
- Speed indicators (load lifting / trolley movement / crane movement) - 0.25 / 0.67 / 0.60 m / s.
- Power indicators of electric motors - 22.0 / 5.0 / 2.75 kW.
- Equipment weight - 41.4 tons.
At KKS cranes, the crane operator’s cabin moves with the load trolley pivotally connected to an additional two-wheeled model, to which the cabin is suspended.
Freight cart
The transport cradle, according to the technical characteristics of the KKS-10 gantry crane, receives a drive from a single-drum winch through a system of ropes and blocks. The assembly is mounted on a supporting truss base over a flexible support. Torque is transmitted by a low-speed finger coupling with a shaft to a cylindrical gearbox.
The branches work in different directions when winding the traction rope onto the drum. One part is guided along the supporting truss, aggregating with safety rollers, the second branch goes to the cargo trolley bypassing the guide blocks of the near console. Such a winding scheme allows you to reel one coil of rope during operation of the unit, while the second part of the cable will be wound on it. You can change the movement of the cart by activating the reverse mode of the electric motor.
terms of Use
Technical characteristics of the gantry crane KKS-10 involve the supply of electricity using a flexible cable. For its winding, a special drum-type mechanism is provided in the lower compartment of the support. An analog with a smaller diameter is located on the same axis with this element. A cart with a load moving along external guide parts is suspended from the active pulley blocks.
Unwinding the cable creates a certain resistance, which exerts tangential force on the drum. This effect is quite enough to start the rotation of these devices. At this stage, the rope is wrapped around the drum, lifting the cart with the load. If the movement is carried out in the opposite direction, the processed material falls under its own weight, changing the direction of rotation of the cable tray, as a result, the coil is wound on it. The unit can move along a track of up to 200 meters, having a margin of drum capacity per 100 m of cord.
Control system
The KKS-10 gantry crane (technical specifications, design described above) monitors the lifting and locking devices using cam controllers mounted in the operator's cab. The system of these regulators includes starting resistances for transforming the frequency of rotation of electric motors.
The lifting unit has a number of limitations:
- By lifting height and load.
- In terms of moving trolleys along the monorail.
- When moving the crane along its path.
For these purposes, limit switches are used that are in contact with the power supply circuit of fuses and relays serving these mechanisms. When the cart goes to the extreme working position or the load is lifted to the maximum height, the corresponding switch is activated, the serviced part of the mechanism is de-energized, and its braking is performed. Another function of the controllers is to block the entrance door to the cab. If it is not closed, activation of working devices is excluded.
Security
In strong winds, the crane installation is prevented from being stolen along the tracks by special grips mounted in racks of drive trolleys. The elements operate in automatic mode, the measurement of the strength of the air flow is carried out using signaling sensors at the top point of the crane.
The indicators read the pressure indicators of the wind acting in the direction along the working paths. They are mounted so that the measuring part looks along the main truss. Under the influence of air flow, the wing deviates, turning the lever rigidly set on the axis. The design aggregates into a pattern with its rotation in one of the sides, depending on the direction of the wind. Next, the load is applied to the microswitches, which operate at critical values, turning off the undercarriage and activating the brake and anti-theft system. The regulator also includes an alarm system, the device must be set to operate when the wind force is from 2.0 to 4.0 MPa.
Installation Nuances
The technical characteristics of the gantry crane KKS-10 (photo above) provides for its installation using chain hoists having a pulling force of 50 kN. However, the operation of other lifting devices is not required.
The assembled support truss is placed perpendicular to the axis of the working path at a height of 800 millimeters from the rail head. The upper compartments of the struts on hinges are attached to the base, interacting with the lower edges with the supporting flanges of the running carts. The hook elements of the chain hoist are connected to the carts of the supports. With the help of a winch, the cradles are pulled together to raise the truss to a height of about five meters. Under it lay two cells from a solid bar or sleepers. The upper chambers of the racks are connected to the lower counterparts by means of flange parts. The carts with the chain hoist close again, after which the unit is lifted to the design mark.