Percussion drilling is employed when auger or wash boring is not possible in very stiff soil or rock. It also can be used in most soil types.
Here the advancement of a hole is achieved by alternatively lifting and dropping a heavy cutting or hammering bit that is attached to a rope or cable that is lowered into an open hole or inside a temporary casing (casings are hollow cylindrical pipes used for borehole stability and to prevent the loss of drilling fluid through the boreholes).
Usually a tripod is used to support the cable. The stroke of bit varies according to the ground condition. The major disadvantage of this method is that it is not possible to get good-quality undisturbed samples. In very hard rock (and especially fractured hard rock), down-the-hole (DTH) drilling can be employed. In this case the hammer, applying repeated percussive pressure, is located just behind the drill bit inside the hole, unlike the open percussion drilling, where the hammer is on top of the drilling string.
The drilling string provides the necessary force and rotation to the hammer and bit, as well as compressed air or fluids to the hammer and for the flushing of cuttings.
This arrangement also allows for much deeper percussion drilling. However, the DTH drills are typically more expensive.
Percussion Drilling Rig,Cable Percussion Drilling,Percussion Drilling Equipment,Deep Foundation Engineering Percussion Rig Henan YK Prospecting Machinery Co., Ltd , https://www.yyphotovoltaicpilingrig.com
Elastic Tape Strech Testing Equipment
Purpose:Â
The instrument is designed for measuring the extensibility and repeatability of elastic tape, cloth and other elastic materials under the maximum stretch.
Principle:Â
Using ecceantric wheel to conduct repeating movement that stretches the elastic material to the maximum extension. Periodically, check and inspect the condition of material. Stop the test when the specimen is suffered severe abrasion more than the expectation, or until the counter reaches a set value.
Standard: SATRA TM103
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ItemSpecifications
Speed
65± 5 rpm
Stroke of movable grip
0~200 mm
Grip width
140mm
Timer
LCD Display 0~999,999
Dimension (approx.)W*D*H
65cm×44cm×41cm
Power
1∮ AC 220VÂ Â 2.5A or specified by customer
Company Profile
   Dongguan Hongsheng Testing Instrument Co., Ltd., is a high-tech enterprise which is professional in all kinds of precision testing instruments. The company founded in 2010, its Chinese headquarters is located in Dongguang city, Guangdong province, China. The company also owns its subsidiary in Hongkong. It is an international-oriented company that focuses on design, production, R&D, sales.Â
   Our products are mainly used to test the physical properties of various materials and to determine and improve the quality of products. We have more than ten series, hundreds kinds of products until now and they are widely applied in scientific research and quality inspection institutions. The Materials and products like plastic, rubber, paper packaging, building materials, wire and cable, footwear, leather, textile, furniture office chairs, bags and sports are all can be tested if necessary. Besides, our machines and equipments are with world standards and regulations i. e. ISO, ASTM, DIN, EN, UL, CSA, UDE and so on.Â
   We are always seeking excellent technology and top quality products with fair prices and a lot of well-known quality inspections institutions and enterprises such as , Adidas, Puma are using our products.Â
   Our entire staff sincerely and warmly welcome friends from all the world to visit our company for cooperation and create a bright future hand-in-hand.
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ServiceÂ
Installation And Training Service
Hongsheng Installation and Training Services ensure smooth set-up and training forr new instrument(s).
Trained technicians are available to install the instrument and train all of the operators to save the downtime cost and facilitate immediate use.
Training is available at customers'facility or ours, or by remote assistant , vedio (which can reduce travel cost) etc.
Repair and maintenance
Hongsheng offers full repair service of instruments to reduce the repair cost of customers themselves.              Â
Before delivery, a detailed checklist of tasks is carefully executed and the results will be delivered to customer.
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AccessoriesÂ
Normally, the machine will run well for many years and in case of meet any parts problem, we will offer parts /Â accessories without any charge within one year.