The symmetric drilling system is designed to drill and case a hole
simultaneously through unstabled ground conditions. The driver bit
incorporated with a satisficial ring or reusable ring makes a full
face head design which significantly improves the penetration rate
and hole straightness of drilling. The internal flushing grooves
together with the built-in casing shoes gives a good seal to the
button of the drilling hole, and thus minimising the disruption of
the surronding of the drill hole.
Application Range: It is suitable for drilling water wells ,
geothermal wells , short mircopiles ,medium mini-type grouting hole
of building , dam and harbour project .
1. Ring bit and casing shoe assembly is welded to casing prior to
drilling. Lock the assembly into pilot bit with hammer. The pilot
bit's upper shoulder engages the shoulder of the casing shoe.
2. Hammer's percussive energy is transferred through the pilot and
ring bits, crushing rock . Part of impact energy advances casing.
3. On completion of drilling and casing , the drill string with
pilot bit is retrieved by a slight reverse rotation to unlock the
bayonet coupling . The ring bit stays in the hole , and can be
recovered only if the casing is retrieved
4. Drilling continues to the desired depth in the bedrock using a
When drilling, the reamer bit will rotate out to enlarge the hole
which enough for the casing tube slide down behind the reamer. When
reached required depth,the drill pipe will drill to the reverse
direction and the reamer bit will retract, it is allowing the whole
drilling system to pass through the casing.
The below size of Eccentric systems which are available, and the
special design is upon customer’s requirement:
Eccentric 90, Eccentric 114, Eccentric 140, Eccentric 165,
Eccentric 190 and Eccentric 240
Widely used in mines, quarries, earthworks and other engineering
drilling blasting hole, guardrail hole, mountain reinforcement,
anchorage and other engineering holes,geothermal exploration hole,
Well bore and other fields.
1. price commitment: in order to ensure the high reliability of
products, high-quality brand products are selected for raw material
selection. Under the same competitive conditions, no more products
will be provided to customers at a favorable price, based on the
reduction of the technical performance of products.
2. Quality commitment: product manufacturing and testing have
quality records and inspection data; the performance of the product
can withstand customer inspection.
3. Customer service: in order to create new diamond brand, enhance
the visibility of enterprises,establish corporate image, we serve
customers with the principle of "preferential prices, good service,
reliable product quality"principle.
The appearance of the picture is different from that of the actual
product, and the actual product is the standard.