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  Test Poltava GOK (Ukraine)

It is for the first time in the world that inventors of Anvik LLC developed the Theory of dynamic interaction of the cutter bits with borehole bottom in the process of drilling, which allows to have a feedback, that is according to the wear of the worked out cutter bits it will be possible to improve design of the bits. The concept of inventors of Anvik LLC is that wear of the bearing part of the rolling cutter bits was a little faster than wear of hard alloyed equipment of the teeth of the cutter bits.

CERTIFICATE

ABOUT HOLDING COMPARATIVE TESTS AT OJSC “POLTAVA MINING AND BENEFICIATION PLANT” OF TESTED ROLLING CUTTER BITS 244.5 OK- 2.331---1 30% MNC-BITS (US PATENT #7195086) AND CONVENTIONAL BITS 244.5 OK- 2.331-, BEFORE THEIR MODERNIZATION, DESIGNED BY BIELGOROD CJSC “GORMASH”.

According to the confirmed by the administration of OJSC “Poltava mining and beneficiation plant” and approved by management of “Anvik LLC”, “Program and methodology of holding comparative tests at OJSC “Poltava mining and beneficiation plant”, committee composed of:

From OJSC “Poltava mining and beneficiation plant”

D.G.Bykov Chief engineer of Dniprovsk mining department

O.A.Afonin Deputy chief engineer of Dniprovsk mining department

S.L.Heleta Chief of CPBR

From “Anvik” LLC

V.A.Lytvynenko Deputy director of “Anvik” LLC, Chief designer of MNC technology

  1. From March 3, 2010 to March 14, 2010 comparative tests were held in the quarry of Dniprovsk mining department of OJSC “Poltava mining and beneficiation plant” for three couples of testing, modernized rolling cutter bits 244.5 OK- 2.331---1 (30%MNC-bits) and conventional bits 244.5 OK- 2.331-, designed by Bielgorod CJSC “Gormash”.


 

The tested bits differ from the conventional ones by using varied pitches between the hard-alloyed teeth of the cutter bits, instead of even pitches in conventional cutter bits. In the drilling process tracking is excluded and also dimension of fraction of the drilled slurry is bigger, due to fine mathematical calculation OF THE MANAGED BLOCKED CHIPPING (MNC-effect) while drilling specific hard rocks, which allows SIMULTENEOUSLY to increase footage (m), speed of drilling and hourly durability of the bit work while decreasing the number of the hard-alloyed teeth.

The tested cutter bits had fewer number of the number of the hard-alloyed teeth by 6 pcs (120 g per bit).

  1. GOAL OF THE TESTS.

To define technical and economical indices of the compared pairs of the cutter bits with full timing of their work under identical conditions.

  1. PLACE, CONDITIONS OF THE TESTS.

    1. The tests were held on the drilling machines #10 and #8 on blocks -265-29, -20-68, -42-286 in the quarry of Dniprovsk mining department of OJSC “Poltava mining and beneficiation plant”.

Hardness of rock is 16 units.

    1. The compared pairs of tested and conventional bits are worked out under real conditions of drilling of blast holes of the quarry of OJSC “Poltava mining and beneficiation plant”, with full timing of drilling of each rod, with identical hardness of the drilled rock with registering operating conditions of the worked out cutter bits.

    2. Working of the conventional and tested rolling cutter bits was made by alternation method, that is one conventional bit and one tested bit in strictly identical mining and geological conditions of Dniprovsk mining department, according to the approved “Program and methodology of tests”. Both tested and conventional bits worked out until obvious signs of their failure appeared: jamming or sludging of the bits, breakage of the bit tops, wearing of the instruments, etc, when the compared pairs are worn out completely.

    3. For each compared pair an Initial Act of results registering was made for full timing of the bits work, signed (by shifts) by a drilling machine operator and a timekeeper. All the bits that are in the used in the comparative tests, are registered in the logbook of the drilling machine.

  1. RESULTS OF THE TESTS.

    1. Three compared pairs of tested and conventional cutter bits were worked out:

1st pair: tested bit #172396 and conventional cutter bit #171368 (drilling machine #10, block #-265-29, ore, rock hardness 16, load per bit is 22 tons);

2nd pair: tested bit #172394 and conventional cutter bit #170983 (drilling machine #10, block #-265-29, ore, rock hardness 16; drilling machine #8, block #-20-68, ore, rock hardness 16, load per bit is 22 tons);

3rd pair: tested bit #172395 and conventional cutter bit #171004 (drilling machine #8, block #-20-68, ore, rock hardness 16, load per bit is 22 tons).

    1. Results of the comparative data of working out of the tested and conventional cutter bits are given in Table 1 and are represented well on the result charts of the comparative tests.

Table 1. RESULTS OF THE COMPARATIVE TESTS OF THE TESTED 30% MNC BITS 244.5 OK- 2.331---1 (US PATENT #7195086) AND CONVENTIONAL BITS 244.5 OK- 2.331-, DESIGNED BY BIELGOROD CJSC “GORMASH” HELD FROM MARCH 03, 2010 TO MARCH 14, 2010 IN THE QUARRY OF OJSC “POLTAVA MINING AND BENEFICIATION PLANT”.

First pair

Item

Indices

Tested cutter bit 172396

80 rpm

Conventional cutter bit 171368

100 rpm

Difference of indices

Percentage %

1

Total footage (m)

345 m

240 m

+105 m

+43%

2

Total time of drilling (min, h)

1364 min 22 hours 44 min

821 min 13 hours 41 min

9 hours

+66%

3

Total speed of drilling (m/min)

0.25 m/min

0.29 m/min

0.04

-16%



Second pair

Item

Indices

Tested cutter bit 172394

100 rpm

Conventional cutter bit 170983

100 rpm

Difference of indices

Percentage %

1

Total footage (m)

401 m

309 m

92 m

+29.8%

2

Total time of drilling (min, h)

1247 min 20 hours 47 min

1023 min 17 hours 03 min

3 hours 44 minutes

+21.9%

3

Total speed of drilling (m/min)

0.32 m/min

0.3 m/min

0.02

+7%



Third pair

Item

Indices

Tested cutter bit 172395

110 rpm

Conventional cutter bit 171004

110 rpm

Difference of indices

Percentage %

1

Total footage (m)

438 m

360.5 m

77.5 m

+21.4%

2

Total time of drilling (min, h)

1310 min 21 hours 50 min

1196 min 19 hours 56 min

2 hours

+9.5

3

Total speed of drilling (m/min)

0.334 m/min

0.3 m/min

0.034

+10 %



The results of the tests show positive properties of the tested cutter bits, expressed in simultaneous increase of footage (in meters from 21.4% to 43%), speed of drilling (up to 10%), hourly durability of the tested cutter bits (from 9.5% to 66%). Depending on modifying revolutions of rotation of the cutter bits from 80 to 110 rpm, there is an obvious saving of hard-alloyed teeth or 120 g per a cutter bit.

Diagrams. THE RESULTS OF THE COMPARATIVE TESTS OF THE TESTED 30% MNC BITS 244.5 OK- 2.331---1 AND CONVENTIONAL BITS, DESIGNED BY BIELGOROD CJSC “GORMASH” HELD FROM MARCH 03, 2010 TO MARCH 14, 2010 IN THE QUARRY OF OJSC “POLTAVA MINING AND BENEFICIATION PLANT”


4.3 Processing in block 42-286 to drill drilling machine 8 (hole number 71 - a Tested cutter bit (30% MNC bit), hole number 74 - Conventional cutter bit) sampled sludge to visually determine the increase in slurry fractions from MNC effect, the effect of drilling blasting holes.

Analysis of the slurry fraction shows that the tested cutter bits showed up to 2.8 times the coarse constituent of the slurry fractions (slurry fraction is bigger than 5 mm) and decreasing of fine slurry fraction up to 2.6 times (slurry fraction is smaller than 5 mm). It demonstrates clearly the work of the tested cutter bits, using MNC effect, when drilling holes at OJSC “Poltava mining and beneficiation plant”.

4.4 During the tests, the photos were taken from the worked out compared pairs.

 

Tested cutter bit No 172396 (US patent No 7195086)

80 rpm

100 rpm

Conventional cutter bit No 171368

Footage – 345 m (+43.75%)

Footage – 240 m

Durability – 22 hours 44 minutes (+66%)

Durability – 13 hours 41 min

Speed of drilling – 0.25 m/min (-15%)

Speed of drilling – 0.29 m/min

Saved – 6 teeth (120 g)

 

The cutter bits rotate

1st pair

Full wear

Tested cutter bit No 172394

100 rpm

100 rpm

Conventional cutter bit No 170983 (CJSC “Gormash”)

Footage – 401 m (+29,7%)

Footage – 309 m

Durability – 20 hours 47 minutes (+22%)

Durability – 17 hours 05 min

Speed of drilling – 0.32 m/min (+7,0%)

Speed of drilling – 0.3 m/min

Saved – 6 teeth (120 g) of hard alloyed equipment

 

All the three cutter bits rotate

2nd pair

Full wear

 

Tested cutter bit No 172395

110 rpm

110 rpm

Conventional cutter bit No 171004

Footage – 438 m (+21.4%)

Footage – 360.5 m

Durability – 21 hours 50 minutes

Durability – 17 hours 03 min

Speed of drilling – 0.33 m/min (+10%)

Speed of drilling – 0.3 m/min

Saved – 6 teeth (120 g)

 

Two cutter bits rotate, one is sludged

3rd pair

Wear of the rod

 

It is for the first time in the world that inventors of “Anvik” LLC developed the “Theory of dynamic interaction of the cutter bits with borehole bottom in the process of drilling”, which allows to have a feedback, that is according to the wear of the worked out cutter bits it will be possible to improve design of the bits. The concept of inventors of “Anvik” LLC is that wear of the bearing part of the rolling cutter bits was a little faster than wear of hard alloyed equipment of the teeth of the cutter bits.

Analysis of the worked out bits showed that conventional bits with even pitch between teeth and bearing unit of the rolling cutter bit is more accelerated than that of the tested rolling cutter bits. All the rolling cutter bits of the three pairs of the conventional cutter bits were jammed with full wear and did not rotate by hand, due to a big quantity of fine slurry fraction, received while drilling the holes by conventional rolling cutter bits.

First and second pairs of the tested bits were worn in the part of hard-alloyed equipment of the teeth with working rods. All the rolling cutter bits were rotated by hand, due to big quantity of coarse slurry fraction, received while drilling boreholes by tested cutter bits and smaller sludging of the bearing unit of the cutter bits.

One rolling cutter bit of the third pair was sludged which led to taking away the cutter bit from testing, and the other two cutter bits could be rotated by hand with relatively intact hard alloyed equipment of the teeth.

In order to increase efficiency of the designs of the tested cutter bits, according to the wear results, it is possible to make a conclusion: the design of the tested MNC cutter bits have to be strengthened by equipping, in order to approximate wear of the teeth to the wear of the rod, and also to improve the system of antisludging of the bearing units.

All the above mentioned improvements of the tested rolling cutter bits can be solved when using the US patent 7195086 and “Theory of dynamic interaction of the cutter bits with borehole bottom in the process of drilling” by “Anvik LLC”.

  1. CONCLUSIONS AND RECOMMENDATIONS.

    1. Designs of the tested rolling cutter bits 244.5 OK- 2.331---1 (30% of MNC cutter bits), developed by “Anvik” LLC, according to US patent No 7195086 and manufactured by Bielgorod CJSC “Gormash” – are functional under conditions of the quarry of OJSC “Poltava mining and beneficiation plant”.

    2. The results of the tests are given in Table 1 and the charts.

    3. Positive results of the compared tests give grounds to use in practice while drilling boreholes in the quarry of Dniprovsk mining department of OJSC “Poltava mining and beneficiation plant” modernized for work with using MNC effect of the conventional rolling cutter bits in the process of drilling, according to the US patent No 7195086, manufactured not only by Bielgorod CJSC “Gormash”, but also other plants-manufacturers of the rolling cutter bits with even pitch in the CIS countries and abroad.


 

  
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