This paper will mainly introduce the unfixing holding-latch hydraulic jack, Hydraulic jack is one of the key products of WINCOO ENGINEERING CO.,LTD.
Here is the content list:
What is the working principle of unfixing holding-latch hydraulic jack?
What are the characteristics of unfixing holding-latch hydraulic jack?
What are the possible faults and solutions in use?
What is the working principle of unfixing holding-latch hydraulic jack?
Hydraulic lifting device (package unit) is evenly distributed around tank inner wall. Tank top and upper (the first layer) wall plates are lifted first and then install and weld wall plates of tank body. Self locking hydraulic jack and hydraulic hoist composing of lifting frame and lifting rod are adopted. When oil enters hydraulic jack, upper clamp fastens and lifts lifting rod and expansion ring and mobilize tank (including tank top) to ascend upward. When oil returns to jack, upper clamp returns with piston and lower clamp automatically fastens lifting rod without gliding. The jack repeats the movement and make lifting rod ascend with tank to designated height (spare height for next layer of plate). After butt weld of next layer of wall plates, open upper and lower loosening device and loosen upper and lower clamp to make lifting rod and expansion ring descend to lower expanded and welded rib plate of the next layer of wall plates and then lift. Repeat the process and ascend welded tan till the last layer of wall plates are installed and welded. The installation of the whole storage tank is completed.
What are the characteristics of unfixing holding-latch hydraulic jack?
1.Hydraulic lifting is stable, safe and reliable. The system adopts uniform control and single or partial (several) adjustment can be realized, so the lifting process is relatively stable. Characteristics of unfixing jack determine its good self-locking performance, without tank or heavy object gliding or falling due to power outage, which ensures safe and reliable hydraulic lifting.
2.Construction quality is guaranteed. Lifting height can be precisely controlled because of adjustable function (slightly descending). Welding quality if rank is guaranteed for the reasons given above.
3. Equipment is easy for operation with good working environment and efficiency.
4. The equipment has good adaptability. This set of equipment is applicable to hydraulic lifting of large-scale storage tanks with various volumes ranging from tens of thousands of cubic meters only by regulating hydraulic hoist (unfixing jack, hoisting frame, lifting rod, etc.)
5. Hydraulic pump station can be arranged at proper position as per actual working conditions. For large scale storage tanks, hydraulic pump station can be placed inside the tank, outside the tank or space between two tanks (when one pump station controls two tanks installation) for construction control.
6. Hydraulic pump station has manual and automatic controls with apparent features as strong adaptability and good technical performance price ratio.
7.Short construction period, low cost and good economic returns. Due to high modernization of package unit and fast lifting speed, the unit has low construction cost and good economic returns. The techniques has such advantages as easier for centralized control, convenient operation, safety and reliability (no falling), precise control of weld clearance and lifting height, which guarantees project quality, saves labor and reduces cost with remarkable economical benefit.
8.Unfixing jack is widely used in project installation due to its scientific structural design. The jack is composed of upper clamp, oil cylinder, lower clamp and support. Upper and lower clamps are equipped with self locking device. Upper clamp automatically locks lifting rod when oil cylinder ascends and lower clamp automatically loosens. During stroke return, upper clamp loosens and lower clamp locks lifting rod, thus, lifting rod cannot descend and lift heavy object to designated height step by step. The heavier the object is, the tighter the locking device locks. Heavy objects will not fall even during sudden power cut or oil pipe burst. This lifting mode is proven to be safe and efficient with low cost compared with pneumatic jack, big stroke jack and high altitude stranded wire lifting. These modes are not comparable to unfixing jack in terms of safety and practicability and it is the optimal product and installation for substitution. Unfixing jack is rapidly developed and applied in inversed lifting installation of storage tanks, power plant absorption tower and stack steel lining. This jack has slight descending function, which is convenient for plate to plate butt weld. As long as chaining fixing of support and lifting point are sufficient for bearing object load, the jack can lift object to designated place safely and efficiently.
What are the possible faults and solutions in use?
Faults | Possible causes | Solutions |
The jack cannot lift or lifting stroke is inadequate | 1. Lifting rod is partially deformed or inclined | A. Shake or vibrate lifting rod prior to lifting. B. Replace or adjust lifting rod straight |
2. Upper and lower oil path is mistakenly connected | Connect oil path as specified. |
3. Upper and lower clamp block teeth are severely worn. Clamp block support is damaged or spring fatigued or lost | Replace clamp block, base or spring |
4. Backspring fractures or severely deforms | Replace backspring |
5. Insufficient oil supply pressure | Adjust working pressure of oil pump |
6. Heavy load | Take measures to decrease load or add jack |
7. Jack piston seal is damaged | Replace damaged seal ring |
Oil penetration or oil leakage | 1. Seal element is damaged, severely worm or invalid for aging | Replace corresponding seal element. |
2. Cylinder galling | Repair or replace cylinder |
3. Loose connection or damaged seal element | Fasten connection thread or replace corresponding seal element |
Oil leakage at quick coupler | Coupler or O-ring damaged | Replace coupler or corresponding O-ring |
Stepping up failure | Reversed rotation of motor | Adjust motor rotation direction |
Solenoid valve fails | Check and replace new solenoid valve |
Low oil level | Replenish hydraulic oil till surpassing red scale |
Oil pump severely damaged or worn | Replace oil pump |
Above, we introduced the principle of hydraulic jack, characteristics and possible problems and solutions. I believe you have a more detailed understanding of the hydraulic jack. When hydraulic jack homework need the cooperation of all parts, any accessories problems may make hydraulic jack cannot normal use, therefore, to know hydraulic jack structures not only help us to understand the principle of it, will also help us in a timely manner when it fails to distinguish and confirm fault promptly eliminate, can let hydraulic jack to provides us with better services.
