The role and precautions of the jack, what should I pay attention to when using the jack?

Jacks are divided into two types: mechanical jacks and hydraulic jacks, and the principles are different. In principle, the principle on which the hydraulic jack is based is Pascal's principle, that is, the pressure of the liquid is consistent everywhere, so that in a balanced system, the pressure exerted on the smaller piston is smaller, and the pressure exerted on the larger piston is also larger, so that the liquid can be kept stationary.

Therefore, through the transfer of liquid, different pressures at different ends can be obtained, so that a transformation purpose can be achieved. The hydraulic jacks we commonly see use this principle to achieve force transmission. The mechanical jack adopts the mechanical principle, in the past, the handle was repeatedly wrenched, the claw was pulled to promote the ratchet clearance to rotate, and the small bevel gear drove the large bevel gear and rotated the lifting screw, so that the lifting sleeve could be lifted or lowered, and the function of lifting and pulling force was achieved.

But it's not as simple as a hydraulic jack.

Before use, it is necessary to check whether the parts are normal.

When using, the provisions in the main parameters should be strictly observed, and overloading should not be avoided, otherwise when the lifting height or lifting tonnage exceeds the regulations, serious oil leakage will occur at the top of the cylinder.

3. If the oil volume of the manual pump body is insufficient, it is necessary to add N33 hydraulic oil that should be fully filtered to the pump before it can work.

4. Please refer to the instruction manual of the electric pump for the electric pump.

5. The center of gravity of the heavy object should be selected moderately, the focus point of the jack should be reasonably selected, the bottom surface should be flattened, and the soft and hard conditions of the ground should be taken into account, whether the tough wood should be lined, and whether the placement should be stable, so as to avoid the weight sinking or tilting.

6. After the jack lifts the heavy object, the heavy object should be supported firmly with a support in time, and it is forbidden to use the jack as a support. If you need to support heavy loads for a long time, please use it.

7. When several jacks need to be lifted at the same time, in addition to the jacks should be placed correctly, multiple diversion valves should be used, and the load of each jack should be balanced, and attention should be paid to keeping the lifting speed synchronized. It is also necessary to consider the possibility of the ground sagging due to uneven weights to prevent the danger of tilting of the weighted object.

8. When using, first dock the quick connector of the hand pump with the top, then select the position, and tighten the oil drain screw on the oil pump to work. In order to lower the piston rod, the manual oil pump handwheel is slightly loosened in the counterclockwise direction, the oil cylinder is unloaded, and the piston rod is gradually lowered. Otherwise, it will be dangerous to descend too quickly.

9. The detached jack is a spring return structure, which can be quickly taken out after lifting, but the connected hose cannot be used to pull the jack.

10. Due to the small lifting stroke of the jack, the user should not exceed the rated stroke when using it, so as not to damage the jack.

11. Violent vibration of the jack should be avoided during use.

12. It is not suitable for use in workplaces with acid, alkali and corrosive gases.

13. Users should regularly inspect and maintain according to the usage.

How to use the car jack correctly, remember these few precautions, it is dangerous to make a mistake in the jack.

1. Before use, check whether all parts are in good condition and whether the oil is clean. It is strictly forbidden to use the safety bolt of the hydraulic jack when it is damaged, or when the thread and rack of the spiral and rack jack are worn by 20%.

2. The jack should be set in a flat and solid place, and be flattened with a skid.

3. The jack must be perpendicular to the load surface, and an anti-slip cushion should be added between the top and the contact surface of the heavy object.

4. It is strictly forbidden to overload the jack, not to lengthen the handle, and not to exceed the specified number of people.

5. When using, no one should stand in front of the safety bolt.

6. In the process of jacking, an insurance cushion should be added under the heavy object with the rise of the heavy object, and the heavy object should be cushioned in time after reaching the jacking height.

7. When two or more jacks are used to lift an object at the same time, the total lifting capacity of the jack should not be less than twice the load. When jacking, it should be commanded by a special person to ensure that the jacking speed and force of each jack are basically the same.

8. The jacking height of the hydraulic jack shall not exceed the limit mark line; The jacking height of screw and rack jacks shall not exceed four-thirds of the height of the screw or rack.

9. The jack shall not bear the load without taking care of it for a long time.

In the process of placing the jack, keep the load center of gravity action line consistent with the jack axis, and strictly prevent the danger of jack deviation and tilt due to the jack foundation deviation or load horizontal displacement in the jacking process. To prevent the jack from sliding in contact with the metal surface of the heavy object or the smooth surface of the concrete, if necessary, a hardwood block should be inserted.

The jacks commonly used in automobiles are divided into two types: hydraulic type and mechanical type, including 3t, 5t, 8t and so on.

When using hydraulic jacks, the hydraulic switch should be tightened first, the jack is placed and aligned with the part to be jacked, and then the handle is pressed, and the work object will gradually rise. When the jack is dropped, the switch can be slowly unscrewed, and the working object will gradually descend.

The following points should be taken into account when using jacks:

The car wheels should be tucked in with triangles before jacking.

If on the soft road surface, the padding board should be added under the jack base to reduce the unit pressure on the ground.

When jacking, make sure that it is vertically aligned with the working object to prevent slipping and causing accidents.

When lifting and lowering the jack, it is strictly forbidden to work under the car.

When the jack is short of oil, it should be filled with the specified oil, and cannot be replaced by other oil.

The jack column is equipped with an adjusting stud, which can be screwed out and screwed in as needed.

The use of jacks is not as difficult as imagined, but it requires a little effort. Although the jack can easily lift the car, we must still do the following safety measures when using it to ensure safety.

1. Fix the vehicle.

Before lifting the car with a jack, we must first fix the car to avoid the car being unstable after being lifted, and hurting people when it falls.

Why do manual transmission cars need to be fixed by gear?

If the car is in neutral, the car is equivalent to braking only by the handbrake, and the handbrake is only for the rear wheels. If one of the rear wheels needs to be replaced, then after the jack lifts the vehicle, it is equivalent to leaving only another rear wheel with braking power, and it is difficult to ensure that the car is fixed; If the gear is engaged, the car will be braked by the engine, and even if one wheel is off the ground, the other three wheels will have braking power, which is obviously more secure.

2. Don't forget to take safety precautions.

After parking the vehicle, we can't ignore the necessary safety warning measures, and quickly put the warning triangle within a safe distance behind the car!

3. Pay attention to fixing the bottom of the jack.

When we use jacks, we must pay attention to the ground conditions, and we should try to choose the ground suitable for jack fixation to operate.

If the car is on soft ground and we can't find a solid and flat road surface to fix the jack, then we can put a large and hard support under the jack, such as wooden boards, floor tiles, iron plates, etc., to help the jack be fixed on the ground.

4. Pay attention to the maximum load-bearing weight of the jack.

Each jack has its own bearing limit, and this weight limit is marked on the jack's label. Before we use a jack, we must understand this maximum load-bearing capacity, as well as the working limit of the jack.

The safest way is to let the jack be "dedicated to the car", and try not to use the jack on the non-matching body, in case the support is not enough to cause accidents.

5. Align the vehicle chassis support point.

On both sides of the chassis of the vehicle, near the wheels, there are support points for the jacks to contact. The lifting part of the jack must be supported on the chassis support point, otherwise it is difficult to fix the vehicle, and it is easy to cause damage to the jack and even damage the chassis.

1.Estimate the weight of the heavy object, choose the right jack, so that the load of the jack does not exceed its rated load. 2.

When using more than two jacks to lift a heavy object at the same time, the load should be balanced, and no one of them should be overloaded. Unified command should be given during work to ensure the steady rise of heavy loads. 3.

According to the center of gravity of the overweight object, the position of the focus point of the jack is selected, so that the creature will not tip over during the lifting process. 4.The placement of the jack should be flat and not skewed, so that the jack will not tip over after being stressed.

1. Choose the right tool to work. When working with hydraulic jacks, be sure to choose the right tonnage. This ensures that the tool can bear enough weight to carry out the work smoothly.

At the same time, it is also necessary to choose the right height of the tool according to the height of the work task, otherwise it is easy to cause the hydraulic jack to get stuck in the machine and cannot be taken out.

2. Check carefully before use. Before using hydraulic jacks to work, careful inspection should be carried out to check whether the tonnage of the product is appropriate, whether the height is appropriate, and whether the product is damaged, and wipe the tool clean before putting it into use after ensuring that the tool is shipped well, so as to ensure the safe and smooth progress of the work.

3. Stable placement. When the hydraulic jack is put into work, it should be placed in a stable place and cannot be tilted to prevent the carrying weight from falling down because of the tilt of the jack. In this way, we can ensure that the product is intact and the task can be completed smoothly.

4. Multiple tools should be uniformly deployed. In the actual work process, because of the different weights, it may be necessary to need multiple jacks to work together, at this time, we must pay attention to the unified deployment of multiple jacks to ensure the balance of the heavy objects, and there will be no tilt.

5. Reasonable storage and regular inspection. In order to ensure the integrity of the tool, the sweet acacia extends its service life. After finishing the work, it should be kept indoors, not exposed to the wind and sun, so as not to damage the machine. At the same time, it is necessary to carry out regular inspections to solve problems with the product in a timely manner.

The jack uses a rigid jacking part as a working device, which is often used to jack a certain point or side of the car in automobile maintenance, so as to carry out the maintenance work of the chassis part. Jacks are divided into two types: mechanical jacks (commonly known as stools) and hydraulic jacks, and there are two types of mechanical jacks: rack type and spiral type. (1) Prepare for a brief lack of staring 1) Before jacking, refer to the vehicle lifting point and support support point described in the maintenance manual.

2) Make sure that the two jacks on the side of the vehicle that needs to be supported are adjusted to the same height, and place them near the vehicle 3) Place the wheel stops in front of the left front tire and the right front tire (if the vehicle is jacked from behind). (2) Lifting 1) Tighten the release handle 2) Put the jack in the specified position and then lift the vehicle, paying attention to the vehicle parts in the direction of the support point. Never place the jack on the torque beam axle for jacking.

3) Bracket with jack 1) Place the bracket according to the instructions and align the rubber groove on the jack with the car body. 2) Recheck the bracket height so that the vehicle is in a horizontal position. 3) Slowly release the release handle, and when the load is placed on the jack, stop and slowly tap the bracket with a hammer to check if they are all in contact with the ground.

4) Remove the jack after the inspection.

Jacks are mainly used in factories, mines, transportation and other departments as vehicle repair and other lifting, support and other work. Its structure is lightweight, strong, flexible and reliable, and can be carried and operated by one person.

In principle, the most basic principle based on hydraulic transmission is Pascal's law, that is, the pressure of the liquid is consistent everywhere, and the common hydraulic jack uses this principle to achieve force transmission.

The screw jack used to pull the handle repeatedly, and the pulling jaw was to promote the ratchet gap to rotate, and the small bevel gear drove the large bevel gear to rotate the lifting screw, so that the lifting sleeve could be lifted or lowered, and the function of lifting and pulling force was achieved, but it was not as simple as the hydraulic jack.

Jack is a common tool whose main role is to lift heavy objects and is a mechanical lifting device. It is usually composed of a base, a lifting column, a lifting rod, a handle, a support plate, etc. Its working principle is to use the power of manual or hydraulic pressure, through some mechanical principles, to transmit the handle or sock loss hydraulic oil to the lifting column and lifting rod to produce a lifting effect.

The jack has a wide range of functions and is suitable for a variety of occasions. For example, when a car tire needs to be replaced, a jack can help lift the body so that the tire can be replaced; In construction work, jacks can be used to lift or move heavy components or concrete slabs; In industrial production, jacks can be used to lift or position equipment or machines; In an airlift operation, jacks can be used to rescue trapped people or lift heavy objects for search and rescue. Although jacks have a high level of safety when used, there are a few things to be aware of when using them.

For example, when using a jack, you need to make sure that the base is securely placed on a stable ground; It is necessary to keep the handle or hydraulic system stable during the lifting process to prevent the jack from sliding or tilting; When using hydraulic jacks, you need to pay attention to the use and replacement of hydraulic oil to ensure the normal operation of the hydraulic system. In short, as a very practical tool, the jack has a wide range of functions, but it is necessary to pay attention to safety when using it to ensure the effectiveness of use.