The middle of the push-pull main shaft on the rotary oil cylinder is connected with the oil pipe by a rotary oil distribution sleeve. The specific connection method is sliding processing between the telescoping spindle and the outer cylinder liner. The lower part of the spindle is processed with an oil-resistant rubber ring groove, which is placed in the oil-resistant rubber ring. The upper part of the outer cylinder liner is processed with a large hollow screw cap, and the hollow screw cap is processed with oil resistance. The rubber ring groove is placed in an oil-resistant rubber ring to seal the main shaft, and the oil cylinder is pushed and pulled to rotate the main shaft. This is how the middle is connected.
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