Heated gas spring to drive the sealing technique

As shown in the original inflation method, the rubber column 6 is pre-stressed to block the air passage, and the pressure of the air source against the elastic force of the rubber column is used to charge the gas into the spring. When the pressure gauge reaches a certain value, the inflation is stopped. The inflation is completed. The disadvantage of this method is that the gauge pressure is not equal to the internal pressure of the spring, and the difference between the two is the pressure difference of the rubber column 6 by the elastic force $P. Since the material of the rubber column 6 is not uniform, the elastic force of the same size rubber column 6 is different. Due to manufacturing reasons, the height error of the cavity in which the rubber column is placed, etc., causes the pressure of the gas to open the rubber column 6 to be different, that is, the difference of $P for each Gas Spring. PN=PB-$P, if PN is set to 315MPa, $P is set to 011MPa, then the gauge pressure PB is 316MPa. If $P is higher than the set value of 011MPa, PN is less than the set value, resulting in insufficient gas spring elasticity. The gas spring will be scrapped in advance.

11 pressure 1 air pipe (air source) 31 inflatable seal 41 air inlet (air passage) 51 gas spring housing 61 rubber column 71 snap ring 81 air chamber 91 telescopic rod original inflation method structure new inflation method for this inflatable process Improvements have been made and the new process is as shown.

A head 5 is pre-positioned in the airway, and a hydraulically driven striker 2 is arranged above the airway. When the air source is opened, the gas enters the spring chamber through the gap between the head 5 and the air passage. That is, the pressure of the air chamber, that is, PB=PN, after reaching the specified pressure, the striker 2 hits the head 5 to cause plastic deformation to block the air passage, and achieves the purpose of sealing the air. It is not difficult to see that the accuracy of the inflation at this time depends on the accuracy of the pressure gauge.

11 hydraulic device 21 striker 31 seal ring 41 air passage outer port 51 head new air method structure air passage outer port plugging air passage outer port 5 is sealed by electric welding, the shell material is 1Cr18Ni9Ti, the electrode type is A102, the diameter is <215mm. The process is manual arc welding. Since the welding rod and the workpiece are easy to bond, the arc can only be induced in advance, causing waste of the welding rod, and because the outer port of the air passage is small, the diameter is <214 mm, the strip is not easy to be aligned, and the pores and slag inclusions must be repaired, if the air is inflated according to the old process. At this time, the spring may be completely scrapped. Because the rubber column may be charred by heat, it can no longer be used. For this reason, the external port is sealed. As shown, the electrode 4 is clamped on the chuck 3. The chuck 3 rotates with the motor 2, and the gas spring 6 is connected to the welder ground. The welder and the upper end of the motor The head is connected by a brush. During operation, the electrode 4 is lowered, and the welding time is controlled by a timing device to control the size of the solder joint. The speed of the welding rod 4 is adjusted by the speed regulating motor, generally about 400r/min. When the arc is triggered, the rotating contact between the welding rod 4 and the welding element is equivalent to the scratching of the welding rod and the welding piece during manual arc welding, due to the forced rotation of the welding rod 4. The welding rod 4 has no adhesion to the weldment, and production practice confirms this. The rotation of the welding rod causes the droplet to stir the molten pool, so that the composition of the molten pool is uniform, the condition of the molten pool is greatly improved, the slag is floated, and the elimination of harmful gases is also facilitated. The agitation of the molten pool improves the appearance quality of the solder joint, and reduces the protrusion height of the welding point of the gas spring air passage outside the welding head of the welding electrode 11 Concentric rings.

Conclusion 11 After more than 2 years of production practice, the improved gas encapsulation process is practical. The initial encapsulation process has a success rate of only 80%, and the new process has a 95% success rate. The original external sealing process has an average of one electrode per electrode. Sealed 89 ports, and the efficiency is low, and the operation is difficult. The new process seals 1,618 ports per electrode, which is less difficult to operate. 21 The airway outside the mouth blocked by the new technology, the appearance quality has reached the appearance quality of the imported gas springs in the UK. Due to the new process, the internal pressure of the gas spring is uniform, and the service life of the gas spring is increased by 6%.31 The sealing method of the air passage of the gas spring is also valuable for other welding production.