Using methods of full length mechanical pipe expander
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Using methods of full length mechanical pipe expander

Views:1     Author:Site Editor     Publish Time: 2020-07-17      Origin:Site

Using methods of full length mechanical pipe expander

The machine is divided into main lines of preparation for expansion and diameter expansion: main machine, straightener, feed car, butt weld rotating device, idler roller, front flushing device, rear flushing device, expanding head flushing device, hydraulic system, double The main parts of the line lubrication device and spray lubrication device, the lateral movement tube truck and the electrical system.

 

The following knowledge points are listed below:

Application of full length mechanical pipe expander

Working process of full length mechanical pipe expander 

 

Application of full length mechanical pipe expander

The working principle of the expanding machine is to form the qualified, internally and externally welded steel pipe on the die of the expanding head section by section. As the mold expands outward, the inner wall of the steel pipe expands outward under the action of the mold. Make the pipe flow along the pipe wall, eliminate the singular internal stress caused by the forming and welding of the steel pipe, and evenly distribute the internal stress of the material. Through strict control of the expansion of the mold, the diameter accuracy and roundness of the steel pipe can meet the requirements of the relevant standards.

 

 

Working process of full length mechanical pipe expander 

 

From the inlet pipe to the outlet pipe machine, the following steps must be completed:

                                        

The first step: the horizontal moving pipe transporter lifts the steel pipe from the material conveying roller table and transports it to the front washing center line, and falls on the front washing rotating roller;

Step 2: The flushing nozzle moves forward close to the end face of the steel tube; the front flushing rotating roller rotates, while the flushing head is under high pressure and large flow flushing; after the flushing is completed, the flushing nozzle retreats, and the steel tube is empty (there is a difference in height between the two rotating rollers) ;. Three actions are completed automatically and continuously;

The third step: the horizontal moving pipe transporter lifts the steel pipe from the flushing rotating roller and transports it to the center line of the diameter expansion, and falls on the butt weld rotating roller (the pipe transporting vehicle returns to pick up the incoming material);

Step 4: Rotate the welding seam rotating roller, and monitor with a camera monitor to stop the welding seam on the steel pipe to the 12 o'clock position; (At the same time, it is fed into the opening of the clamp jaws, the ram moves, and the jaws are aligned with the pipe above the steel pipe. Wait behind the wall);

Step 5: Waiting for the incoming vehicle to approach the steel pipe, the clamp clamps the weld of the steel pipe;

Step 6: Two synchronous rollers lift up the steel pipe, the clamps follow the servo motor to rise, and the follower rollers also follow up until the steel pipe is lifted to the height of the center of the expansion head (rising height in advance Adjusted);

Step 7: Feed the vehicle to the steel pipe near the expansion head; (the roller brake is released when feeding and returning the vehicle, and brake at other times)

Step 8: The clamp motor lifts the tube tail; (For each batch of the first steel pipe, manually observe whether the gap between the expanding head and the inner diameter of the steel pipe is uniform, remember the height of the clamp from the theoretical position, and correct the amount of steel pipe bending input to the computer. Use this method to correct whether the steel pipe bending value input to the computer is correct.);

The ninth step: feed into the vehicle stepping feed tube, while the clamp is lowered by a straightening distance, the spray device sprays and lubricates the inner wall of the steel pipe, and the host expands the diameter after being sent to the position; afterwards, repeat the step feed tube, clamp down, spray lubrication, and Expanding action;

Step 10: The front end of the steel pipe exceeds the supporting roller and the swing roller swings down;

The eleventh step: the front end of the steel pipe exceeds the lower roll of the straightener, and the first upper roll is pressed down; the front end of the steel pipe exceeds the third lower roll of the straightener, and the second upper roll is pressed down;

The twelfth step: the clamp of the feed car is released and waiting, the motor of the active head roller drive device runs, the grinding clutch is engaged, the head roller is changed from passive to active, and the steel pipe is stepped to expand the diameter (when the small pipe diameter 3. When it is difficult to feed the small-wall thick steel pipe, the lower roller of the three straightening device changes from passive to active, and is fed into the steel pipe step by step with the head roller);

The thirteenth step: the front end of the steel pipe exceeds the support roller, and the second swing support roller swings down;

The fourteenth step: the full-length expansion of the steel pipe ends, the upper pressure roll of the straightener rises, and the active head roller reversely exits the steel pipe quickly;

Step 15: The front end of the steel pipe retracts past the second swing roller, and the second swing roller is raised;

Step 16: The steel pipe decelerates when approaching the clamp. The pipe wall of the steel pipe enters into the clamp of the feed car at a slow speed. The clamp tightens the wall of the pipe. The head roller is switched to passive, and the steel pipe is quickly withdrawn from the feed car.

Step 17: The front end of the steel pipe retracts past the first swing idler, and the first swing idler rises;

Step 18: After the steel pipe is retracted to the initial position, the clamps are loosened, and the feed car continues to retreat. The following rollers are lowered first, and the two synchronous rollers are lowered later. The steel pipe is dropped to the V-shaped support raised by the second traverse car. Shelf

The eighteenth step: the second horizontal moving vehicle sends the steel pipe to the post-washing station, and the steel pipe falls on the conveying roller table of the station; at the same time, the expanding head washing device flushes the expanding head; it is ready to expand the second steel pipe.

Step 19: The conveying roller quickly conveys the steel pipe to the flushing hood. When the pipe end enters the flushing hood and is close to the nozzle, the conveying speed is changed to the working speed. The inner nozzle and the outer spray ring simultaneously spray the emulsion to wash the inner surface and outer surface of the steel pipe. surface;

Step 20: The back end of the steel pipe is washed by the spray nozzle, the full length of the steel pipe is washed with emulsion; the conveying roller conveys the steel pipe in reverse, the inner nozzle and the outer punch ring are replaced by the clean water pump, and the inner surface and the inner surface of the steel pipe are washed with clean water. The outer surface;

The twenty-first step: the front end of the steel pipe is retracted past the inner nozzle and the outer spray ring, the water pump stops water supply; the conveying roller stops conveying; the steel pipe stops moving.

Step 22: The empty water riser rises, the front end of the steel pipe is lifted, and the water in the pipe is empty;

The twenty-third step: the empty water lifting pipe rack descends, the steel pipe falls on the conveying roller,

Step 24: The conveying roller sends out the steel pipe;


After the above twenty-four steps, the expansion process of a steel pipe is completed.


Flushing before expansion is required to protect the expansion head. Flushing after expansion is set to meet the requirements of the subsequent process. Therefore, the pre-flushing should be performed according to the requirements of the machine. The post-flushing can be based on the post-process Requirements, the process personnel determine the flushing fluid and flushing process.Our company is committed to producing various types of full length mechanical pipe expander.please feel free to contact us if you need full length mechanical pipe expander, Tack welding machinepipe straightening press.


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