Prestressed Mono Jack for 12.7mm Cable Strand
Product Overview:
Single-acting hollow hydraulic jacks are suitable for processing, maintenance, and traction operations. The special hollow piston design enables the draw rod or cable to pass through the entire hydraulic cylinder for lifting or jacking operations, often used for backward pulling and forward squeezing operations; when equipped with interchangeable steel reinforced piston bases, Can also be used for conventional jacking operations.
Prestressed Mono Jack for 12.7mm Cable Strand Details
Description Datils
Multi Mono Strand Jacks can be used for single-hole tensioning and group anchor tensioning one by one. The mono jack is light in weight, easy to operate, high in efficiency, and has a short reserved length of steel strand, which is especially suitable for high-altitude or small-space operations.
Technical Parameters
| Project | Unit | Value |
| Tension | KN | 257 |
| Oil pressure | MPA | 50 |
| Tension piston area | M² | 5.137*10 |
| Return piston area | M² | 1.335*10 |
| Piercing hole diameter | MM | 19 |
| Dimensions | MM | 180*568 |
| Return oil pressure | MPA | ≤ 25 |
Common faults and solutions
1. When lifting a heavy object, the ejector rod cannot rise to the maximum stroke. When the jack reaches a certain height and the maximum stroke is not reached, the ejector rod can no longer rise, which indicates that there is a lack of working oil in the jack and should be replenished.
2. The ejector rod shakes during the ascension process. This is generally because the oil return valve is not closed tightly, and the oil return valve can be tightened counterclockwise. If it is still unstable, observe whether there is oil leakage around the pressure rod. If there is oil leakage, it means that the sealing ring of the ejector rod is damaged and should be replaced. If there is no oil leakage, reconfirm whether the oil return valve and the oil inlet valve are closed tightly, including the condition of the sealing gasket at the joint of the end face of the pressure rod cylinder. If all the above are normal, it means that the sealing ring of the ejector rod is damaged or the fixing screw is loose. The screws should be replaced or tightened.
3. The mandrel cannot rise when it is empty. First check the amount of oil in the jack, and add it if it is insufficient. If the jack is not short of oil, loosen the needle of the oil return valve of the jack, remove the oil plug of the oil filling hole, then step on the base of the jack with your feet, pull up the ejector rod with both hands and then press it down, and repeatedly pull and press the ejector rod several times to Exclude the air. After the above actions, tighten the oil plug of the oil filling hole and the oil return valve, and then try to empty the top. If the ejector rod still cannot rise at this time, put the jack flat, remove the oil return valve, and check the alignment between the valve and the seat. Whether the contact condition is good, if there is dirt, it should be removed, if there are pits, grooves, and unevenness, it should be replaced. Finally, check whether the oil inlet valve is well sealed, whether the sealing ring of the ejector rod is damaged or falls off, and if so, replace it in time.
4. Oil leakage. It can be seen from observation that the oil leakage parts of the jack are mostly at the joint between the base and the cylinder, around the ejector rod, at the locking thread of the oil return valve, at the fixed oil plug of the oil filling hole, around the pressure rod, etc. The reason of oil leakage is mostly that the sealing gasket is damaged and must be replaced in time.
Instructions for use
The jack is connected to the oil pump through a high-pressure oil pipe, and a professional electrician connects the oil pump to the power supply through a power cord.
Turn on the oil pump and run it for no less than 3 minutes.
The jack piston reciprocates no less than 3 times. If there is crawling, it can be increased to 6 times. If there is still crawling, stop the pump for inspection and analyze the reason.
When the jack and the oil pump system are calibrated and before tensioning, the jack must be run dry. Calibration and tension work can only be started after everything is normal.
Calibration is carried out in units recognized/authorized by relevant state departments. Operators are qualified to work.
The calibration procedure shall be carried out according to the regulations of the undertaking calibration unit.
Note: Wax is applied inside the taper hole of the tool clip and tool ring.
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About Zhongtuo
Shaanxi Zhongtuo Mining Equipment Co., Ltd. was located in the ancient city of Xi'an in 2005. The company focuses on the production and development of intelligent equipment, focusing on mining equipment, splitting equipment, prestressing equipment, drilling, and rock drilling equipment, shotcrete grouting equipment, and road equipment! The products are used in bridge construction, tunnel subway construction, mining, and hydropower new energy projects.
Zhongtuo business scope covers drilling rigs, bridge tension jacks, diamond saw machines, mud pump machines, mortar spraying machines, dry-mixed shotcrete machines, high-pressure grouting pumps, rebar processing machines, rock splitters, pavement machinery, rescue tools, and so on.
Business Purpose
Shaanxi Zhongtuo Mining Equipment Co., Ltd. was founded with "credibility first, service and thoughtful" as the purpose of the enterprise, the spirit of "honesty, openness, hard work, innovation" spirit of enterprise, adhering to the scientific development, the quality of survival, to serve the credibility of the guiding principles.
Prospect Future
Become a world-class mine equipment development manufacturer and service provider; "perfect quality, boutique concept, in-depth development, customer first" credo to build the brand and the future; Honesty, seeking economic and social unity, pioneering the development of the times.
