GH1 rubber belt shot blasting machine - PWENT

GH1 rubber belt shot blasting machine

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Rubber belt gascylinder steel spareparts, shot blasting machine. 750 mm wide rubber belt with 700 mm diameter.

750 mm wide rubber belt with 700 mm diameter. Max batch 200 kg, 5 kg each. Caps, speare parts cleaning. The GH 1 type shot-blasting equipment is mainly offered for the bulk surface cleaning, surface treatment of cast, wrought, pressed parts.

Options

  • Automatic hydraulic feeding equipment
  • Discharge conveyor belt
  • Electronic rotational speed control of blasting wheel
  • Electronic speed control of rubber belt
  • Magnetic separator for removing forming sand

 

Installation layout: 

 

Technical description

The GH 1 type shot-blasting equipment is mainly offered for the bulk surface cleaning, surface treatment of cast, wrought, pressed parts. The equipment has got one piece of blasting turbine.
The shot-blasting material is led to the turbine axial gravitationally. The turbines are 6- blade constructions, with pre-acceleration, with accurate blasting jet adjustment opportunity. The parts to be blasted are placed on the rubber belt through the door on the front of the machine. With the rotation of the rubber belt, the work-pieces in the machine house move on each other while the shots thrown from the turbine clean their whole surface. As an optional item we can deliver automatic hydraulic feeding equipment, which feeds the prepared work-piece batch into the equipment. For optimal surface cleanliness, the amount of the blasting material and the blasting time can be infinitely variable. As an optional item the turbine can come complete with a frequency converter. Changing the revolution number of the blasting turbine, the impact speed of the shots can be increased or decreased. The inner surface of the blasting cabin in the active zone is covered with highly wear-resistant manganese steel. Shot-blasting can only be done with the doors of the cabin closed. It gives perfect protection against the shots shooting out. The closed and continuous circulation of the shot-blasting material is ensured by the bucket elevator, abrasive cleaning unit and the feeding unit. The cleaned parts can be discharged from the working space by turning the rubber belt backward after finishing the blasting and opening the door. The dust created during shot-blasting is aspirated and separated with the help of cartridge system dust aspirating-separating equipment. The equipment can be controlled from the central control cabinet. Manual mode of operation is possible for service purposes, for normal operation mode automatic mode is available.

Technical description of the APSZ cartridge dust-separator

The aim of the equipment – The equipment is used for filtering the dusty air generated in industrial factories. It is fully automatic and ensures the separation of different kinds of dust with high efficiency.

The operation of the equipment – The air (gas) to be cleaned flows into the air chamber. It flows through the filter cartridges from the outside to the inside and in the meantime the dust is separated at the outer surface of the cartridges. The clean air leaves through the discharge chunk, the separated dust falls into a hopper and then it leaves the filter through the outlet. The cartridges are cleaned by blowing in compressed air. The time span of the blowing-in and that of the break can be changed by means of the electronic control unit.

Constructional description – The equipment is manufactured on the „building cabinet” principle. The filter elements and certain parts of the frame and the control is the same in case of different size dust filters. The air to be cleaned enters the machine through the chunk on its side. The air flows through the cartridges, enters the outlet chamber, and then leaves the equipment through the suction cover. The air can get into the outlet chamber only through the filter cartridges. The back wall of the outlet chamber has a special design in order to hold the cartridges properly. The filter cartridges are fixed with screws. The blowing pipes for cleaning the cartridges are placed in the outlet chamber. They are placed in such a way that the high pressure air coming from the bores can flow into the cartridges to blow the accumulated dust off the surface of the filter cartridges. The air from the air tank gets into the blowing pipes through a membrane valve. The membrane valve is controlled by the electronic control unit. The time span of the blow-off and that of the break can be adjusted. There are large sealed doors on the outlet chamber for changing the filter cartridges and making the maintenance safe. The dust falls into the hopper under the chambers and from there it gets into a dust-collecting vessel through the dust discharger. The quality of the cartridges built into the equipment and the  measurements done so far ensure that the dust emission after the filter is not more than 3 mg/m3, so the clean air can be led back. The inlet and outlet chambers of the machine are made of steel plate. The sealing between the elements prevents dusting out. The machine is mounted in a profile steel frame and can be fixed through the frame elements. The equipment does not need any maintenance. The lifetime of the cartridges is about 3.000 working hours.

Dust aspiration, dust separation

Task: The aspiration of the dust created during shot-blasting and preventing the dust from getting out into the environment.

Elements of dust aspiration system: Radial suction fan, cartridge dust separator, aspiration ducting The aspirated air can be recycled into the work space or it can be led out. Dust content of cleaned air after the dust separator: max 3 mg/m3.

Safety elements The V-belts and chain drives are provided with casing to ensure accessibility.The d oors on the machine house ensure with electric locking that the machine cannot be started when the doors are open. If the door opens during operation, the equipment immediately stops. The electrical equipment on the control panel is secured with a lock to prevent unauthorized operation. The equipment cannot blast without the operation of the dust aspirator. There are 2 emergency stop buttons on the equipment. Pushing either of these buttons the equipment stops immediately. All the units of the equipment are connected into the electric shock protection system. The cables have sealed connection to the motors. The electrical units of the equipment are provided with the necessary standard signs.

The effect of the equipment on the environment1.4.1. Noise level of the shot-blasting equipment

The noise generated by the machine is expected to be 80-84 db(A), measured near the machine.
The value of the noise generated by the dust aspiration and separation unit after noise sealing and sound damping is 70 and 75 db(A). A higher level of noise can be expected at the valves cleaning the cartridges – the impulse noise level is about 80 db(A).
The general noise level of the equipment with sound damping can be less than 80 db(A).

Dust load on the environment

After the dust filter, according to the offer, the quantity of dust in the air is below the value of 3 mg/m3. This is certified by the measurements done so far. The full amount of filtered air can be led out into the environment or it can be recycled into the operation area.
The shot-blasting material in the equipment will be steel shot. Thus the air contaminating material does not contain fibrogenic materials, so according to point 2 of the MSZ-21461-2:1992 standard „Clean air requirements of work-places – Flying dust” the allowable average concentration is 10 mg/m3.

DELIVERY UNITS

Machine house (blasting space)

The machine house is a welded plate construction with profile steel bracing. The inner surface has manganese wear protection. The ABR – 380 type blasting turbine is mounted on the top of the machine house. The turbines are each driven by a 5.5 kW, 2800 rpm electric motor with four V-belts. Tensioning the V-belts can be done by tilting the motor support.
The bottom of the machine house is a cone-shaped trough construction. The fallen shot-blasting material and the heavier contaminations are collected here. There is a screw conveyor in the conical trough and it conveys the shot-blasting material to the bucket elevator. The drive gear turning the rubber belt is placed on the machine house. The driven, endless rubber belt keeps the bulk parts in continuous movement. There is an aspiration stub on the machine house to aspirate the dust created in the machine house, through which the machine house is connected to the dust aspiration network of the complete machine.

Manganese wear protection

The whole inner surface of the blasting space (machine house) is covered by special wear-resistant manganese plate. The thickness of the plate is 5-8 mm. The wear protection protects the structural units of the machine from the harmful wearing effects of the blasting for a long time. A characteristic feature of the steel with 13% manganese content is that its surface is getting harder and harder because of the hitting-wearing effect of the shots (Hadfield steel). Welding the manganese steel is done by special electrodes which have wear protecting characteristics matching the basic material.

Bucket elevator, with maintenance platform

Its main parts: leg, drag and head. The leg includes the lower drum of the elevator with the bearings. The leg is a welded construction made of bent plate, with connecting frames on its side to connect the cross screw conveyor. The drag is a simple rectangular self-supporting structure. The access hole needed for mounting the belt can be found on it. The head consists of the drum ensuring the drive of the bucket elevator, the chain tensioning structure and the outlet aperture. The head is connected to the drag by bolt connection. The driving drum in the head drives the bucket belt which is used for the tensioning of the belt, too. The buckets are fixed to an endless cloth-insertion rubber belt by bolt connection. Conveying capacity: 4 m3/hour, gear performance: 0.75 kW.

Blasting material cleaning and dosing tank

Cleaning the shots is performed by a suction system, two-step blasting material selecting equipment welded of fine plate. The surface of the steps has rubber covering. Suction holes can be found on its door. There is a pipe stub mounted on the back end of the wind sorter. The butterfly valve regulating the air speed can be connected to any end point of it. The dust contamination separated by the wind sorter gets into the dust tank through a rubber hose. The cleaned shots chute into the dosing buffer tank. The blasting material selected in the blasting material cleaner is collected in the dosing tank. At the bottom of the dosing tank a sector gate ensures the regulation of the shot supply of the blasting heads. The sector gate is operated pneumatically. The amount of shot to be blasted can be adjusted by adjusting the bumpers. The blasting material getting into the tank can only flow down through an internal sieve where the bigger size contamination gets tied up which could cause trouble getting into the blasting tank.
Tank volume: 0.25 m3- number of discharging holes: 1 piece. The blasting material flows from the discharge stubs to the blasting turbines through wear-resistant rubber hoses.

Technical details

Blasting space size:

    • Rubber belt width: 750 mm
    • Belt disc diameter: 700 mm
    • Max batch volume: 0,12 m3
    • Max weight of batch: 200 kg
    • Max wieght of each part: 5 kg
    • Material to be blasted: steel

The dimensioons of the shoot blasting machine and necessary space to install:  accortind to the attached drawing

Blasting method: with impeller wheel manual or automatic method

Necessary staff: 1 person

Blasting material: Steel shoot GP type 0,4-1,2 mm

Blasting materia load: 300 kg

The noise level of the machine: 80-84 dB(A)

 

Turbines

Number of turbines: 1 pc

Type: ABRD-380

Diameter: 380 mm

Rotation of the turbines: 2800 turn/minute

Scattering power: 130 kg/min/turbine

Electrical power:: 5,5 kW/turbine

 

 

Consumption

Electrical: 11,4 kW

Compressed air

Pressure: 6 bar

Quantity: 6 m3/hour

Dust separator ventillator power: 2500 m3/h

Electrical data

Voltage: 3 x 400 V

Controlling voltageVezérlőfeszültség: 24 V

Frecvency:  50 Hz