The working principle and structural characteristics of pipe bender

China Aluminum profile cutting machine suppliers

The pipe bender is a new type of pipe bending tool with a pipe bending function and lifting function. You can bend all kinds of pipes to the position you want to reach. The pipe bender has many advantages, such as reasonable structure, safe use, convenient operation, reasonable price, fast loading and unloading, multiple uses in one machine, etc., and occupies a large share in the domestic hydraulic pipe bender market.

 

The working principle structure of pipe bender:

A pipe bender is generally composed of an electric oil pump, high-pressure oil pipe, quick joint, working cylinder, plunger, bending parts [including upper flower plate, lower flower plate, die head, roller shaft. The high-pressure oil output by the electric oil pump is fed into the working cylinder through the high-pressure oil pipe, and the high-pressure oil pushes the plunger in the working cylinder to generate thrust and bends the pipe through the elbow part.

 

Structural characteristics of CNC pipe bender

  • The CNC pipe bender adopts an all-steel welding structure, which has sufficient strength and rigidity.
  •  Hydraulic transmission, the cylinders at both ends of the machine are placed on the slider to directly drive the sliding work.
  •  The slider synchronization mechanism uses a torsion shaft to force synchronization.
  •  The mechanical gear block structure is adopted, which is stable and reliable.
  • Quick adjustment of slider stroke, manual fine adjustment, counter display.
  • Inclined wedge type deflection compensation mechanism to ensure high bending accuracy.
  • These structural characteristics of the CNC pipe bender determine that it has excellent characteristics.

What kind of pipe bender do I need to use in the pipeline installation process?

The pipeline installation process involves many skills, so in the pipeline installation project, a large number of bends at various angles, such as 90° and 45° bends, B-shaped bends (back and forth bends), bends (curved bends), square telescopic devices, etc., are selected according to the construction site tool conditions and elbow pipe diameter size, which can be processed on-site or in the processing plant.

Equipment required for pipe installation: manual pipe bender, pulley pipe bender, electric or hydraulic pipe bender, automatic pipe bender, hair dryer, mold, steel plate ruler, oven, workbench, acetylene generator, welding and cutting tools, etc.

Elbow conditions: Construction drawings and standard drawings have been completed and reviewed. (There are construction sites and workbenches that meet safety requirements. All pipes with certificates of conformity are entered on site. A technical handover has been carried out. Familiar with the specifications, sizes, and angles of each processing part and make up the material brand. When bending with a manual pipe bender, the operator must avoid the bent steel pipe on the face to avoid slipping off and injuring people.

When simmering with fire, people are prohibited from standing at the pipe entrance to prevent gunfire from injuring people. The location of the coal stove should be contacted with the fire department. The surrounding flammable materials must be removed, and the fire must be extinguished before leaving work to prevent accidents.
The acetylene generator must be equipped with a safety device to prevent tampering. Oil contamination is strictly prohibited on safety chains, oxygen cylinders, oxygen meters, and welding and cutting tools.

 

What protective measures should be taken in the workplace of the pipe bender?

The automatic pipe bender is suitable for pipe installation and repair in factories, warehouses, docks, buildings, railways, automobiles, etc. In addition to its pipe bending function, it can also remove the elbow part (cylinder) and use it as a separate hydraulic capping machine.

What should I pay attention to when using a pipe bender? Workplaces should be fenced. Before the operation, it should be operated without load, confirmed normal, and then die bent pipe. The pipe mold should be selected according to the diameter of the processed pipe and should be placed in order. Oil must not be added between the tube and the tube mold.
The machine should be clamped, and the guide plate support mechanism should be reversed in time according to the direction of the elbow. During work, non-operators and auxiliary personnel are not allowed to stay around the machine to watch. After work, cut off the power supply, lock the electric gate box, and do a good job of daily maintenance.
When the pipe bender works, only strict adherence to the 7 operating rules of the pipe bender can ensure the quality and safety of the bender, and the maintenance of the machine is durable for a long time.

 

How to prevent angular deviation in oil temperature of pipe bender?

We all know that hydraulic pipe bender mainly relies on the hydraulic oil pump to input hydraulic oil and thus relies on hydraulic solenoid valves to provide control hydraulic power to the cylinder piston to realize the operation of each part. It was originally set at 90° under normal conditions, but after the oil temperature gets higher, there may be an angle deviation of 100° or 70°. How can we solve this situation?

Hydraulic oil runs back and forth in the oil pump motor and then to the solenoid valve to push to achieve high-pressure input; in this mode, our oil temperature will soon rise, especially in the hot summer, all kinds of pipe bender, including metal circular, saw machine automatic pipe cutter and pipe shrinking machine, etc., will appear, oil leakage cannot lock the oil so that the pipe cutter head falls, the pipe shrinking machine has insufficient pressure, bending angle of the pipe bending machine The error is very large.

Of course, this is more troublesome unless it is generally not needed in special circumstances. The best way is to add some hydraulic oil appropriately at the beginning of summer and turn off the machine when the hydraulic pipe bender equipment is in operation.

Our hydraulic pipe bender works 8 hours a day. Normally, this kind of problem does not occur, but if these conditions occur, it can be solved according to the above methods.

We should determine the working time of the hydraulic pipe bender when no one is operating the machine, try to turn it off so that the hydraulic motor stops running, and check the hydraulic oil tank, whether the hydraulic oil is enough or not enough to add hydraulic oil when summer comes, we should add some hydraulic oil appropriately, only if there is enough hydraulic oil, the oil temperature will not rise so fast, can be inserted into the cooling pump on our pipe bender equipment to achieve The circulation of water cools down.

 

What are the solutions to elbow defects

1) How to solve the crease of the elbow:

  •  Replacement of thick-walled pipe fittings.
  • Increase the bending radius.
  • If the above conditions do not allow, add an anti-wrinkle mold and add a mandrel. Square tubes and rectangular tubes can be reinforced on the bending die.

2) Solution to the poor fullness of the elbow:

  • Increase core drawing for bending.
  • Increase the clamping force to prevent slipping.
  • Increase side thrust to reduce the roundness of the elbow.
  • By increasing the feeding servo, a strong rear top thrust is given when bending the pipe.

3) Solution to the outer thinning of the elbow:

  • Increase the bend radius to reduce the rate of material deformation within a unit angle.
  •  Reduce the diameter of the mandrel to appropriately reduce the fullness of the pipe bender.
  •  Improve the finish of the mandrel to reduce friction with the outside of the elbow.
  • Increase lubrication and reduce friction resistance of elbows and mandrel by using a good elbow to stretch oil.
  • Increase lateral auxiliary thrust to reduce the amount of thinning of the outer wall of the elbow.
  • By increasing the feeding servo, a strong rear top thrust is given when bending the pipe.
  •  Reduce the bending speed of the pipe bender appropriately.

 

 

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