Doosan forklifts

Jewll recently completed a project for a high-end customer where it was necessary to completely flameproof two Doosan forklifts in order for them to comply to the DMR regulations. We pride ourselves with absolute quality work and to always ensure safety comes first, as some mistakes are permanent.

 
 

Brokk

The Brokk machine, better known as a remote-controlled demolition robot, is a typical example of Jewll’s innovation to take a non-flameproof, standard machine and convert it to a flameproof machine that is safe to use in hazardous areas underground. Jewll is able to convert almost any machine to these standards. The Brokk is also a popular choice for underground mining applications as it features an excellent power-to-weight ratio and can be used in areas that do not have a power supply. Different machine models are available to suit every possible underground need.

 

Scoop

A scoop is better known as a battery-powered underground flameproof machine which can be used to clean up sections and transport coal from the face to the feeder breaker. This machine consists of a bucket, a mainframe and an interchangeable battery bank. The scoop usually works on the basis of an eight-hour shift, as to where a three-cassette battery system is interchanged with a charged battery. This battery will be charged and balanced with a specific charger designed for the application. The scoop is fitted with a Saminco Control-and-Drive System which is rated as one of the best in the world.  Many well-known brands are also fitted with the same system. Jewll can repair and manufacture all parts of any brand of scoop worldwide and it can be fitted with lights, sirens, cameras and alarms as per customer specification. Full flameproof certification is done on all machines and parts by approved ATLs in South Africa. 

 

Diesel stop interphase system : flameproof and non-flameproof

The DSS (Diesel Stop System) has been developed to control the mechanical governed engine using a drive-by-wire system.

When the warning zone is entered, the PDS system sends a signal to the relevant solenoids and the engine acceleration is destroked to a pre-set level, regardless of the input of the operator on the accelerator.

When the danger zone is entered, the PDS system sends another signal to the relevant solenoids and the engine acceleration is completely destroked and the brakes of the vehicle are fully engaged.

In order for this system to function, it requires the intercepting of the air and hydraulic systems of the vehicle.

The DSS system is supplied with signals from the PDS system in order for the destroking functionality to work.

When the warning zone is entered, a signal is sent to the DSS system accelerator, which then destrokes the engine to a pre-set level and the brakes are applied proportionally.

When the danger zone is entered, the accelerator completely destrokes the engine and a signal is sent to the brakes and they are fully engaged. It should be noted that the DSS system only works in conjunction with another controller and/or a display screen, of which the screen is a minimum requirement.

This system can be fine-tuned to user specification as it is electronically based. This also prohibits any tampering to take place on the system.

The signals received from the PDS system to the DSS can be used to switch on the cameras and record events as they are happening. This will provide better insight into various events such as accidents and help determine what caused these events.

The system also allows for data logging which monitors the PDS system and how it responds.

The system can still be used as a safety precaution system when an electronic dash is not available.

The DSS system consists of a specialised accelerator pedal, actuator controller and ground speed sensor. The system also utilises the PDS system as well as a battery box and alternator.

The basic system comprises the following components:

  • The throttle controller

  • The electronic module

  • The actuator

  • PV display unit

  • Operator ID

  • Input and output module

  • Inclination sensor

    

 

Diesel rebuilt flameproof and non-flameproof Machines and engines

With the cost of new mining machines, it has become the norm to rebuild mining machines, back to or as close as possible to the original standards and specifications. In most cases it is more cost effective than a new machine.

It is also recommended to upgrade the machine to comply with DMR regulations during the rebuild process that might have changed after the machine was built, for example to prepare the machine to be PDS ready.

The process is structured as follows

  • Strip the machine

  • Compile the cost and prepare a quotation to submit to the customer

  • Receive the order from the customer

  • Compile a project plan with progress meeting dates

  • Strip the machine for shot blasting

  • Dyno test and X-ray of machine structure

  • Overhaul engine

  • Dyno test engine

  • Test hydraulic components

  • Overhaul gearbox

  • Overhaul converter

  • Inspect and repair flameproof equipment

  • Assemble the machine

  • Conduct a field test with the customer

  • Final inspection and prepare machine for delivery

 

GEHL

The skid steer loader was retro-fitted with a Jewll flameproof system. The cooling system on the GEHL is a dry scrubber system which is known to be a very low maintenance system. There are two versions available, namely an electrical and a mechanical system.

 

Belt-cleaning System

We offer a system to aid in cleaning hard-to-reach places such as underneath conveyor belts.
This system allows for fully remote operated use, allowing the machine to move into places previously inaccessible.

A wide variety of attachments are also available.

 

Stone duster

Featuring a hopper to the stone dust, and hydraulically-powered ejector blades, the stone duster ensures a speedy job in covering practically any surface. By using rotating flingers, the stone duster delivers an effective solution to stone dusting. Designed to work off of any vehicle with a QDS attachment, the stone duster is driven by a hydraulic PTO, delivering a supply of 60 litres per minute at 12.8 MPa or 13.8 MPa depending on the size of the duster. Attached to a vehicle travelling at 5km/h, the stone duster is able to apply 20 kg per meter of roadway travelled , thus covering a distance of 60 m in a mere 30 seconds. Each stone duster consists of a hopper that will hold all of the stone dust, hydraulically operated ejector blades, a flinger auger, a composite auger and rotating flingers.

 

Case

A standard CASE machine was fitted with a Jewll flameproof diesel system. A Kabota engine was transformed from a non-flameproof engine to a flameproof engine by converting the inlet, outlet and various other parts into flameproof components. The machine was then fitted with a water tank and scrubber unit to last the full duration of an eight-hour shift as expected from a flameproof machine, and this is known as a wet-cooling system. All the necessary flameproof lights, cameras, sirens and alarms were attached to the machine. The CASE’s field test reports were remarkable. Watch the video.

 

Bobcat

Rock and coal? No problem! The Bobcat Company is an American-based manufacturer of farm and construction equipment. The world-renowned Bobcat brand stands for proven dependability and rugged durability. These reliable machines are skid-steer loaders that are small enough to get into the tight spots, yet tough enough to get you out. When paired with a genuine Bobcat® attachment, each skid-steer model is a force to be reckoned with on your job-site. There are over a dozen sizes to choose from. Jewll has the capacity and experience to turn these wonderful creations into a fully flameproof underground “CAT” that can get the job done, above and underground.

 

Diesel repairs

The focus is on responsiveness coupled with quality workmanship. Safe, reliable equipment is required to handle the demanding conditions both on surface and underground.