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Hight tip buckets:
The engine’s kinematics are usually around 45° for discharging and 45° for undermining, which is a total maximum of 90° (mostly around 88/89°).
The role of a high tip bucket is to increase the tipping height by means of a chassis. Thereof, the angles pointed are unchanged in comparison to the original angles on the rehandling bucket, unless the customer’s changing demand and an analysis of possibilities together with the customer.
Consequently, the blade’s level after discharging increases generally between 450 and 550 mm, which depends on the engine’s height and the bucket’s width. Please be careful with the tooth hight
For discharging in a hopper bin or a motor truck you need to check beforehand:
- the passing height
- the discharge weight (1/3 container, middle container, etc…)
- the passing height
- the discharge weight (1/3 container, middle container, etc…)
High tip bucket with integral discharging:
A high tip bucket with integral discharging enables not only a higher tipping hight but also an integral discharging of the material. The tipping angle is higher than 45°, generally between 70 and 90°. This function needs a setting up of a bucket kinematic which will restrict the engine’s max. tipping load.
The supplementary restraints and the amount of work are exalted. That’s why the tipping load for the same engine is inferior to 20% and depends on the engine’s capacity.
Grapples :
Putting a simple or double grapple leads to a surplus of weight and consequently restricts the engine’s capacity. This load reduction is part of the grapple’s offset and consequently of the buckets size. This lost of load is estimated to 10% till 15%.
When do you need a double grapple?
If the materials are not easy to compact the simple grapple is likely to block locally the load. The bucket would only be half-filled. In this case, a double grapple is need. But be careful, this will lead to specific grapple kinematic and to reinforced curved tines grabs. Consequently you have to take into consideration higher costs.
Specificity of the Z kinematics :
Having a Z kinematics leads first of all at the discharging moment to the risk that the lever/winch impacts the top of the bucket. It is possible to make a gap at the bucket’s top and to lower the reinforcing pieces of the bucket. But this is not possible on any type of machine. It is strongly recommended to put this question to MAGSI TP and to give all the machine’s details. A preliminary survey of feasibility will be proposed to you.
Further on, the tensile strength imposed on the small connecting rod at the discharging moment can modify the discharge angles as well as the angles between lever and the small connecting rod. Consequently, it is very important to confirm this point and in cooperation to modify the bucket’s center distance in order to reduce the discharge angle. This is, as it appears, a commitment in the case where there is a interface between machine and bucket. The load offset which follows modifies systematically the of lever/small connecting rod.
The wrenching power applied to the brackets of the small connection rod in the discharge moment implies reinforcing pieces in this zone. Consequently higher costs have to be calculated in addition to the original bucket costs.
Case of the integral discharge with grapple:
The load surplus generated by the grapple restricts srongly the total load capacity at the butt of the machine. The difficulty of lifting up the bucket in this case is twice as in the case of a simple bucket without grapple.
Magsi TP offers you in this case a bucket with a integral discharging possibility, which in fact, discharges in an angle of max. 55°. This angle is normally sufficient for discharging the materials and does not lead to a big loss of load capacity.
If there is a need absolute of a total discharge possibility with grapple, you have to apply the coefficient 0.66 on the load result found after having calculated 2/3 of the total max. load capacity completely pointed.
This is why MAGSI offers you to analyze the kinematics of your machine as well as the max. load capacity.
Case of an hydraulic or manual carrier:
The interposition of a carrier enables a taking-apart and reassembly of an attachment but leads compulsorily to a load offset in the front. Magsi TP designes its carriers measure-made taking into account the details supplied by its customers and reduces the offset and cantilevered as much as possible.
However, you have to work out the load loss on the tipping load turned in 40° which will be of 10%. This 10% have to be added to the security coefficient already calculated as seen above. It follows in most cases the inconsistency to put on a bucket with grapple and total discharge possibility together with a carrier.
It’s in the customer’s responsibility to assure the machine’s safe load and to supply all details necessary for calculation to Magsi TP.
Hydraulics :
A high tip bucket works on a hydraulic line from 120 bars to 120l/mn.
A high tip bucket with a simple or double grapple works with two hydraulic lines from 120 bars and 120 l/mn or on one line which is equipped with a function selector switch (in this case it is necessary to pull a electric line).
In every case, unless the machine allows it, it is necessary to put a pressure limitation valve at the input.
According to the machine’s equipment and for security reasons, it is strongly recommended to install a double control non-return valve in series on the discharge line. In order to avoid this, the pressure carriage in closed center has to be ensured on the machine line.
In the case where there is a funtion selector switch mounted on a high tip bucket with grapple in order to respond to security questions or utilization manuals, it is important to put a double acting non-return valve on the discharge.
Principal:
With the function selector switch you control either the discharge or the grapple, which avoids inopportune manoeuvres. But please be careful and read the utilization manual. It is actually prohibited to discharge in this case with the closed grapple. When the grapple is working without a function selector switch on the discharge and you want to discharge, the bucket risks to get open because of its own heaviness.
Principal:
With the function selector switch you control either the discharge or the grapple, which avoids inopportune manoeuvres. But please be careful and read the utilization manual. It is actually prohibited to discharge in this case with the closed grapple. When the grapple is working without a function selector switch on the discharge and you want to discharge, the bucket risks to get open because of its own heaviness.
In the case of big buckets, it could be necessary and judicious to put an actuator at the outlet of the discharge rams. Indeed, if the total charge is too high, an effect called « syringe » can be produced in the small chamber on the ram side, in which the liquid is inclied to drag off the bucket much faster forward and consequently to chock the bump stop too strongly. This problem can disappear by installing an actuator at the outlet of the ram which will slow down the outlet and the lurching speed. Of course, this is to be settled in accordance with the customer’s needs.
Rigid or supple line? In every case hydraulic lines mounted in supple are favored. Indeed, their primary characteristic is the absorption of vibrations and consequently to avoid leaks in the connection points and to be easily interchangeable by the customer in a case of leak. But in transports of very scratchy or cutting materials (glass) it is judicious to put on rigid lines which offer a better resistance for this type of aggression.
13/01/2012
