Worm Screw Jack Lift Gearbox Worm Gear Screw Jack Lifter Mechanical Jack

Product Description

1.Convenient to adjust
2.Wide range of ratio
3.Easy to install
4.high torque
Application Industries:
Our SWL series screw jacks are widely used in the industries such as metallurgy,mining,hoisting and transportation, electrical
power,energy source,constrction and building material,light industry and traffice industry

Screw Jacks in construction

Often found in climbing mechanism of construction,the screw jacks use physical means to raise and lower loads, which typically range from 5 tons to 30 tons. A screw jack is a common type of mechanical jack, which works via a motor and gearbox by an operator. A screw uses the shape of its threads to raise or lower the load, or a traveling nut does the lifting while the screw turns in place. Mechanical jacks are self-locking(not for ball screw), which means that when power is removed from the jack, the screw stays in place until power resumes. This setup makes mechanical jacks safer than their hydraulic counterparts, because users don't have to fear a loss of power. The main components of screw jacks are; trapezoidal lifting screw also known as lead screw, worm screw, worm gear and gear housing. A worm screw is rotated manually or by a motor. With the rotation of the worm gear, the lead screw in it moves upwards or downwards linearly. The feed rate of the screw depends on the turning speed, the number of teeth of the gears and the size of the screw pitch. In some models of jackscrews, The lifting screw does not move up and down. It only rotates around its axis. A lifting nut (also known as a travelling nut) moves along the lead screw. The lifting nut of the screw jack is made of bronze to decrease friction.

Product Parameters

MODEL		SWL2.5	SWL5	SWL10	SWL15	SWL20	SWL25	SWL35
Maximum lifting force (kN)		25	50	100	150	200	250	350
Screw thread size		Tr30*6	Tr40*7	Tr58*12	Tr58*12	Tr65*12	Tr90*16	Tr100*20
Maximum tension (kN)		25	50	99		166	250	350
Worm gear ratio (mm)	P	1/6	1/8	3/23		1/8	3/32	3/32
	M	1/24	1/24	1/24		1/24	1/32	1/32
Worm non rotating stroke (mm)	P	1.0	0.875	1.565		1.56	1.5	1.875
	M	0.250	0.292	0.5		0.5	0.5	0.625
Maximum elongation of screw rod under tensile load (mm)		1500	2000	2500		3000	3500	4000
Maximum lifting height at maximum pressure load (mm)	The head of the screw rod is not guided	250	385	500	400	490	850	820
	Lead screw head guide	400	770	1000	800	980	1700	1640
Worm torque at full load(N.m)	P	18	39.5	119	179	240	366	464
	M	8.86	19.8	60	90	122	217	253
efficiency(%)	P	22	23	20.5		19.5	16	18
	M	11	11.5	13		12.8	9	11
Weight without stroke(kg)		7.3	16.2	25		36	70.5	87
Weight of screw rod per 100mm(kg)		0.45	0.82	1.67		2.15	4.15	5.20

Detailed Photos

 

 

 

SWL Series worm screw Jack:

1.The elevator is a combination of turbine pair and trapezoid screw rod to complete the lifting and lowering of objects. 2.Compact structure, light weight, safety and reliability, long service life, convenient installation

3.Self-locking function in the static state.

 

1. screw rod	2. nut bolt	3. cover	4.Skeleton oil seal	5.Bearing
6.Worm gear	7.Oil filling hole	8.Case	9.Skeleton oil seal	10.Cover
11. nut bolt	12.Bearing	13.Skeleton oil seal	14.Bearing	15.worm
16.Flat key	17.Bearing	18.Skeleton oil seal	19.Cover	20.Nut bolt

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