12inch DTH Hammer Symmetric System with Ring Bit

• Customization: Available
• Type: Core Drilling Rig
• Material: Alloy Steel
• Model NO.: 77-785MM
• Power Type: Electric
• Condition: New
• Brand: Prodrill
• Air Pressure: 20 Bar
• Color: Gold, Red
• Hammer Type: 3inch, 4inch
• Outer Dia. of Casing Tube: 114 ~ 168mm
• Inner Dia. of Casing Tube: 101 ~ 148mm
• Wall Thichness of Casing Tube: 6.5 ~ 10.5mm
• Transport Package: Wood Package
• Specification: CE
• Trademark: PRODRILL
• Origin: China
• HS Code: 82071990
• Production Capacity: 10000pec/Months

Product Description

Advantage:
- Straight Holes and Fast Penetration Rate.
- Less Torque in all ground conditions.
- Easy System to lock and Unlock Ring.
- Drilling at any angle required.
- More Holes and Low investment.



The Pro Drill symmetric/Concentric drilling system is designed to drill and case a hole simultaneously through unstable 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 minimizing the disruption of the surrounding of the drill hole. 

Application Range: It is suitable for drilling water wells , geothermal wells , short miscopies ,medium mini-type grouting hole of building , dam and harbor 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 conventional drilling.

Outer Dia. of Casing Tube	Inner Dia. of Casing Tube	Reamed Dia.	Min. Inner Dia. of Casing Shoe	Drill Pipes	Max. Outer Dia. of Normal Bit
mm	Mm	mm	mm	mm	mm
108	93-99	118	86	76	77
114	101-103	127	91	76	82
127	114-116	136	101	76	92
140	124-127	152	117	76	105
146	127-132	154	117	76	105
168	149-155	184	140	76,89	125
178	159-165	194	150	76,89	140
193	173-180	206	164	89,114	150
219	199-206	234	184	89,114	165
244	224-231	260	210	114	190
273	251-257	305	240	114,127	220
323	301-310	348	284	127	255
406	382-388	440	364	140	340
457	433-439	488	413	140	385
508	484-490	538	464	140	440

Concentric (or Symmetrix) Overburden Casing System with Blocks
Model: 1) Casing Shoe + pilot bit + 2 pcs Blocks; Or
2) Casing Shoe + pilot bit + 3 pcs Blocks; Or
3) Casing Shoe + pilot bit + 4 pcs Blocks.


Concentric (or Symmetric or Symmetrix) Overburden Casing System With Wings
Symmetric or Symmetrix Overburden Casing Drilling System With Wings
Symmetrix Overburden Casing Drilling System With Two Wings

Concentric Overburden Casing System

Outstanding:
1. The stable and reliable working performance and the less vibration of drill rig.
2. Flexible to open and close.

Design Principles:
Make the casing follow easy and the equipment and operation simple
The stable and reliable working performance and the less virbration of drill rig.

Operation Procedure:
1. When the drilling starts, the blocks slides down through the grooves on pilot bit, and reams to drive the casing shoes and tubes into the hole.

2. When finished the drilling in overburden rock formations, raise the drilling tools and the blocks will get closed through the grooves, and the drilling tools can be pulled out from the hole.

3. Next construction can be followed.

Dear Sir or Madam: You can order
1) Wings (2pcs) + Locking System + Guide Device = Assembly
2) Or order separately.
3) If you need o. Dia. 178mm or above, we suggest to use our SLIDE BLOCKS model.





Application Range and Examples:
It is recommended to drill in rock formation where contains some ovals and fractures.

Warranty
The company is responsible for any problem caused by defaulty of material and maching.
The broken parts will be replaced at the sight of photos and product serial code.
 

Product Name:	Concentric casing system with ring bit & Concentric casing system (Permanent)
Material:	carbide
MOQ:	5pcs
Design Principles	Make the casing follow easy and the equipment and operation simple
Type	Concentric casing system
Application	It is recommended to drill in rock formation where contains some ovals and fractures.
Certificate	ISO9001   SONCAP
Outstanding Advantages	The stable and reliable working performance and the less vibration of drill rig and flexible to open and close.