φ38.1x2.77mm Integrated vinyl hydraulic tube expander expansion head

φ38.1x2.77mm Integrated vinyl hydraulic tube expander expansion head 

Instructions for expanding head

The expansion head is a special part for the expansion machine, which is the key part of the expansion machine to complete the expansion joint. When using the expansion head, the following requirements should be met:

1. before the formal expansion, no-load boot preheat the machine for 3-5 minutes.

2. Before expanding the tube, the sharp mouth and burr at the end of the heat exchanger must be removed to avoid damaging the expansion head.

3. Before installing or replacing the expansion rod, use a syringe or other methods to fill the expansion rod with water or the selected expansion tube medium to exclude the air in the expansion rod.

4. In each replacement of the hose and expansion head, the air in the ultra-high pressure system must be emptied, and the expansion medium must be supplemented in time to avoid affecting the work efficiency and ensure the safety of operation.

5. the expansion of the heat exchanger expansion hole extension line (opposite the heat exchanger) should not stand, otherwise the application of steel plate or other methods for protection.

6. for the part of the tube that can not be inserted into the expansion head, the outer circle of the expansion head can be ground small, the gap between the inner diameter of the tube and the outer diameter of the expansion head should not exceed 0.3 mm, too large a gap will greatly reduce the service life of the expansion head.

7. During the expansion operation, the expansion head can be pulled out only after the pressure is completely relieved. Before the expansion pressure is completely removed, it is strictly prohibited to pull out the expansion head, otherwise it will seriously damage the expansion rod.

8. When inserting or pulling out the expansion head, it is strictly prohibited to twist the expansion head.

9. It is forbidden to carry out expansion operation before the expansion rod is inserted into the pipe hole or not yet fully inserted into the pipe hole, so as not to damage the expansion rod.

Service life

1. The life of the expansion rod is achieved by controlling the total clearance (the sum of the gap between the inner diameter of the tube plate hole and the outer diameter of the heat exchange tube and the gap between the inner diameter of the heat exchange tube and the outer diameter of the expansion rod) between 0.6-0.8mm.

Therefore, the total clearance <0.6mm, the life will be longer; Total clearance >0.8mm, life will be reduced; Total clearance >1mm, life will be lower.

2. the life of the expansion rod is an average, the same specification, the more the number, the longer the average life, on the contrary, the shorter, less than 10 can not ensure life; With different specifications, the larger the diameter of the pipe, the longer the average life, and the shorter the vice versa. At different lengths, the longer the expansion rod, the shorter the average life, and the longer the vice versa.

3. in the implementation of strength expansion joint, the expansion rod liquid bag (rubber part) on both sides of the edge must be controlled more than 8mm from the edge of the tube plate slot, to prevent the liquid bag edge of the rubber joint expanded in the slot, otherwise it will seriously affect the life of the expansion rod.