Common Knowledge of Mechanical Equipment - Straightening and Cutting Machine Chapter (2)

4、 Next, we will focus on the steel bar straightening machine.

The structure of the steel bar straightening machine is adjusted by rotating the high-speed rotor to adjust the angle of the straight wire mold, achieving the effect of straightening, and then feeding the wire forward through the feeding wheel. After reaching the required size, the thread touches the positioning key and pushes the runway forward by 5 millimeters. The upper punch presses the vertical wire cutter and immediately cuts it. The thread passes through the pressure plate on the vertical wire cutter and presses the open bearing. The thread automatically falls into the support frame. If you want to change the length, move the positioning key

1) Scope of use of steel bar straightening machine: The Jin Dun straightening machine has the characteristics of reasonable structure, convenient operation, safety and reliability, and is suitable for straightening wires for chicken cages, rabbit cages, building mesh, various welding wires, Shu Le board wire cutting, and irregular mesh.

2) Function and characteristics of steel bar straightening machine:

(1) Cutting the length of steel bars without error,

(2) Double headed pulling style,

(3) Until the last meter of steel reinforcement is adjusted and pulled out,

(4) The construction wire is made of tungsten steel molds,

(5) The product thread adopts a ball end mold, and the steel bars produced will not damage the surface.

3) The working principle of the steel bar straightening machine: Firstly, the electric motor drives the speed increase through the belt, causing the straightening cylinder to rotate at high speed. The steel bars passing through the straightening cylinder are straightened, and the rust on the surface of the steel bars is removed by the straightening mold; The electric motor drives the hammer head up and down through another pair of reduction belts and a gear reducer. On the one hand, it drives two conveying pressure rollers to pull the steel bars forward, and on the other hand, it drives the crank wheel to move the hammer head up and down. When the steel bars are adjusted to the predetermined length, the hammer strikes the knife holder to cut the steel bars. When the cut steel bars fall into the receiving frame, due to the action of the spring, the knife holder returns to its original position, completing a cycle.

4) Installation precautions for steel bar straightening machine:

(1) The installation site has a solid and sturdy drainage system, and a reliable equipment foundation is established.

(2) Warning areas and signs should be set up around the steel bar straightening machinery processing site, and safety protection fences should be erected.

(3) Safety guardrails and anti smashing sheds should be erected within the radius of rotation of outdoor and tower cranes. Electricity should be used safely and in accordance with regulations, and there should be neutral, grounding, and leakage protection devices.

(4) Operators must receive safety operation skill training and only those who pass the training can take up their posts.

5) Correct operating procedures for steel bar straightening machine:

(1) The equipment must be managed by a dedicated person and certified for duty.

(2) Operators are not allowed to leave the machinery too far during homework, and must stop the machine when hanging up, threading, or cutting off the lead.

(3) During the process of straightening the steel bars, if the steel bars jump out of the tray guide groove, fail to reach the fixed length mechanism, or have loose threads or steel bars detached from the frame, the limit switch should be pressed in a timely manner to stop cutting the steel bars. Only after the adjustment is completed can it be used.

(4) When adjusting each steel bar to the end or straightening short steel bars, the steel bars should be escorted to the guide and straightening cylinder with a sleeve in hand to avoid injury accidents when they are freely swung.

(5) Before the straightening formwork is fixed and the protective cover is not properly covered, it is not allowed to penetrate the reinforcement to prevent the straightening formwork from flying out of the machine and injuring people.

(6) During the operation of the machinery, the drum must not be adjusted, gloves are strictly prohibited for operation, and maintenance work is strictly prohibited during the operation of the machinery.

(7) The steel bars that have been straightened or cut should be neatly stacked in small bundles according to their specifications and number, and should not be stacked randomly to prevent quality accidents caused by different steel bar compositions and properties. After the operation is completed, the power supply must be cut off.

(8) Strictly implement the "cross operation policy" to ensure that the machinery is in good working condition.

6) Improvement measures for steel bar straightening machine

There are safety hazards in the steel bar straightening machine, and improvements should be made to address this situation: a bell mouth shaped inlet tube should be made at the steel bar inlet of the steel bar straightening machine, using a 40mm x 40mm square tube. A frame with appropriate height should be made according to the shape of the bell mouth, and the height should match the height at the inlet of the steel bar straightening machine. The production of the horn mouth adopts a three-level threaded steel with a diameter of 14mm as the main reinforcement, with a length of 2.5m and a spacing of no more than 200mm evenly distributed at the entrance. The 10mm diameter steel bars are welded with spiral stirrups to the main reinforcement. The diameter of the large mouth of the horn is 1m, and the diameter of the small mouth is 0.2m. The straightening of the round steel bar is carried out in a straight line through the horn mouth and enters the steel bar straightening machine. This not only ensures safety but also reduces damage to the machinery, eliminating the potential danger of harm to pedestrians and operators during the laying out of the round steel bar. The straightening of steel bars should be carried out in accordance with safety regulations to ensure the quality and safety of the straightening of round steel bars. To ensure the quality of steel bar engineering, the first step of construction technology for steel bar processing should be done well.

7) Common problems and corresponding solutions of steel bar straightening and cutting machines

(1) A solution to the problem of steel bars not being straightened.

The steel bars that have been pulled out are drilled out from under the discharge frame, and there is a large bend in the steel bars. The middle six straightening wheels should be tightened in an appropriate amount at the same time. If the steel bars being pulled out have small tadpole bends, loosen the middle six straightening wheels outward at the same time.

(2) The problem of steel bars not being fed can be solved from the following aspects.

1. Tighten the traction wheel downwards appropriately.

2. Pay attention to forward and reverse rotation.

(3) There is a solution that does not cut off.

1. The fixed length is not tightly pressed.

2. If the horizontal blade is loose, screw it in and fix it appropriately.

3. The reset top spring of the cutting table is too tight, which prevents the pressure spring of the upright tool rod from bouncing up and cutting off. The reset top spring of the cutting table should be relaxed appropriately or replaced with a thinner reset top spring.

4) After cutting a standard length of steel bar, the situation of one or two small short material heads appearing can be solved from the following aspects.

1. The feeding speed is too fast, and the cutting table cannot return to its position. The two knife tables should be reset and the horizontal top springs should be appropriately tightened or slowly straightened for feeding.

2. The discharge rack is not smooth or lubricated well, to the point where the cutting table cannot be quickly reset. The upper, lower, left, and right positions of the discharge rack should be adjusted so that the cutting table is flat on the bottom plate, so that the discharge rack and the host are in a straight line. Add lubricating oil.

5) The problem of steel bars not falling off after cutting and drilling out from the material rack after cutting once can be solved from the following aspects.

1. Adjust the pressure wheel seat in front of the cutting table so that its bearing presses against the opening and closing pressure plate of the discharge frame.

When the machine is used for more than a month, the wear-resistant cover above the cutting table * will have rounded corners, which will cause the above phenomenon. The wear-resistant cover should be replaced in a timely manner or the rounded corners should be welded with wear-resistant welding rods, and then smoothed with a grinding wheel to form a right angle.

6) The steel bars pulled out have scratches, which may be caused by the following 5 points.

1. Excessive pressure on the straightening wheel;

2. The new machine has a short usage time, and the straightening wheel and steel bars are not running in enough;

3. Grinding marks on the steel bars at the same feeding port or straightening frame axis hole;

If there are strict requirements for steel bar scratches, you can order straightening wheels with softer materials from the manufacturer, which can effectively solve this problem.

In general, after using a new machine for a period of time, the scratches will become less and less until they disappear.

If you want to learn more about related knowledge, please feel free to contact us by hotline at 13819758083. Jietuo Electromechanical is a company specializing in the production and export of portable hydraulic electric steel bar quick breakers, steel bar cutting machines, steel bar bending machines, shear pliers and other tools. With years of production experience, we bring you the best steel bar processing machinery products and high-quality services, making you feel at ease when using them.

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