Content1. What is laboratory jack?
1.1 Working principle of laboratory jack2. Laboratory scissor jack
2.1 Working principle of laboratory scissor jack
2.2 Structure of laboratory scissor jack
2.3 Advantage of laboratory scissor jack3. Type of laboratory jack
3.1 Lab jack4. How to buy laboratory jack?
What is laboratory jack?
Jack is a rigid jacking
part as a working device, through the top of the buttress or the bottom of the small travel to open the weight of the light lifting equipment. The structure of the laboratory jack
is light and strong, flexible and reliable, one person can carry and operate it.
Working principle of laboratory jack
Laboratory jacks are divided into mechanical jacks and hydraulic jacks, etc. The principle of them is different. In terms of principle, the most basic principle on which hydraulic transmission is based is Pascal's law, that is, the pressure of the liquid is the same everywhere. So through the transfer of liquid, you can get different pressure on different ends, and you can achieve a transformation purpose. People commonly see the hydraulic jack as the use of this principle to achieve the transfer of force. The screw jack reciprocally triggers the handle, and pawl that pushes the ratchet gap rotary, the small bevel gear drives the large bevel gear, so that the lifting screw rotation, so that the lifting sleeve gets up or down, and to achieve the function of lifting tension, but not as easy as the hydraulic jack.
Laboratory scissor jack
Laboratory scissor jack
is a kind of jack. It is called a scissor lab jack because its structure is shaped like scissors.Lab scissor jack
, also known as a stand jack, which is light and fast to use and is a major domestic auto factory
with the product. It consists of upper and lower stubs made of sheet metal. The cross-section of the upper strut and the cross-section of the lower strut at and near the teeth is a rectangle with an opening on one side, and the metal plates on both sides of the opening are bent inward. The teeth on the upper and lower stubs are made from the metal plate bent on both sides of the opening, and the width of the teeth is greater than the thickness of the metal plate.
Working principle of laboratory scissor jack
The working principle of the lab scissor jack is based on the length of the two waists of the isosceles triangle remaining unchanged, by shortening the length of the bottom side to raise the length of the shortened bottom side to raise the vertical height of the geometric principle and the design and production of the product. It is through the screw and nut with the screwdriver adjusts the length of the bottom side of the upper and lower two isosceles triangles to achieve the height of the entire scissor jack lifting and lowering.
To give an example of a common tool escalator in daily life, when we use the tool escalator, the vertical height of the escalator is very high when the angle between the two support arms of the escalator is small, and similarly, the vertical height of the escalator is very short when the angle between the two support arms is large.
Structure of laboratory scissor jack
The structure of the scissor jack consists of the following parts, respectively, the base, a set of upper support arms, a set of lower support arms, screws, nuts, a load-bearing table, a swing handle, pins, etc.
Advantage of laboratory scissor jack
a. Product structure tube clean easy to fold and store.
b. Small lifting height and large lifting weight.
c. Beautiful appearance, safe and reliable, easy to use, high-cost performance.
Type of laboratory jack
According to the structural characteristics, the lab jack can be divided into a rack and pinion jack, a screw jack, and a hydraulic (oil pressure) jack three. Other ways can be divided into a separate jack, horizontal jack, claw jack, synchronous jack, hydraulic jack, electric jack, etc.
Hydraulic jack is a jack that uses a plunger or hydraulic cylinder as a rigid jacking member. With a compact structure, smooth work, high jacking force, self-locking, and other characteristics. Hydraulic jack jacking capacity is strong, heavy hydraulic jack jacking force of more than 100t.
Working principle of hydraulic jack
Pump suction process
When lever handles 1 is lifted by hand, the small piston is driven upward, and the sealed working volume in pump body 2 increases. At this time, because the oil discharge check valve 3 and oil drain valve 8 respectively closed their respective oil circuit, so the working volume in the pump body 2 increased to form a partial vacuum. In the role of atmospheric pressure, the oil in the tank through the oil pipe to open the oil suction check valve 4 into pump body 2, completing a suction action.
Pump oil pressure and heavy lifting process
When pressing the lever handle l, drive the small piston down, the pump body 2 in the small oil cavity work volume is reduced, it will squeeze out the oil, push open the oil discharge one-way valve 3 (at this time the suction one-way valve 4 automatically closed the oil circuit to the tank), the oil will enter the hydraulic cylinder (oil cavity) 11 because the hydraulic cylinder (oil cavity) 11 is also a sealed working volume, so the oil into the squeezed and generated by the force will push the big piston up and lift the weight to do work. Repeatedly lifting, and pressing the lever handle, you can make the weight rise, to achieve the purpose of lifting.
Weight falling process
When you need the big piston to return down, the drain valve 8 will open (rotate 90 °), then under the action of the weight's self-weight, the hydraulic cylinder (oil chamber) 11 in the oil flow back to tank 5, the big piston down to the original position.
Through the working process of the hydraulic jack, we can conclude that the working principle of hydraulic transmission is: the oil as the working medium, through the change of the seal volume to transmit the movement, through the internal pressure of the oil to transmit the power. A hydraulic transmission device is essentially an energy conversion device.
Screw jack threads without self-locking effect, equipped with a brake. Relax the brake, the weight can quickly drop on its own, shortening the return time, but this jack structure is more complex. Screw jack can support the weight for a long time, the maximum lifting capacity has reached 100 tons, which is why it is more widely used. And its lower part is mounted on the horizontal screw can also make the weight to do a small distance across.
The electric jack is equipped with an internal pressure-holding device to prevent overpressure, if overpressure, the jack will not return to a certain position, the special structure of the jack can play a double protection role, the lower jack item installed with a dive device, you can achieve a low height to achieve the purpose of high travel.
Use of laboratory jack
a. Lab jack stand. The foundation of the jack should be solid, smooth, and reliable. When setting the jack at the bottom, it should be padded with Dawood or other appropriate materials to expand the force area.
b. The placement of the laboratory jack. If you need to place the jack on the soft ground, it should be padded under the jack to avoid tilting crooked after the force. When the weight is raised, the weight should also be placed under the support mat at any time, but the hand cannot be misplaced in the danger zone. In the process of placing the lab jack, keep the load center of gravity line of action with the jack axis, jacking process to prevents the risk of a skewed, tilted jack due to the jack foundation or load level displacement. To prevent the jack and heavy metal surface or concrete smooth surface contact sliding, if necessary, to pad with hardwood blocks.
c. Laboratory jacking operation. Lab jack jacking height should not exceed the effective jacking range. Lifting large objects (such as beams) should be separated from the two ends of the landing, one end of the landing, the other end must be padded solid, pad firm, and put stable. Laboratory jack is not allowed to use overload.
d. It is not advisable to start the laboratory jack in a hurry. You should have a rhythm of evenly rising and falling slowly. Multiple jacks are used at the same time, to synchronize the operation. Jack’s operation is completed, to carry out a careful inspection, check the oil pressure and hidden problems, and maintain, placed in the appropriate place.
How to buy laboratory jack?
ANTITECK provide lab equipment, lab consumable, manufacturing equipment in life sciences sector.
If you are interested in our laboratory jack or have any questions, please write an e-mail to firstname.lastname@example.org, we will reply to you as soon as possible.