Vacuum priming machine (hereinafter referred to as “oil injection machineâ€) is a special equipment for oil filling of three-cone bit reservoirs used for oil drilling. It integrates functions such as vacuum pumping, grease injection and residual grease blowing. MoS2 grease can be injected into three oil pockets of a three-cone bit at the same time. After being modified, it can also be used to inject grease into other similar equipment or products requiring a high proportion of grease injection.
Vacuum injection is a very important process in the processing of three-cone bit. The level of grease injection directly determines the service life of the drill. For each drilled well, the cost of changing the drill is often as high as hundreds of thousands. According to investigations, China's current use of similar grease injection equipment mainly depends on imports. The successful development of this grease injection machine will help enterprises to improve economic efficiency. The injection machine has a rod cavity oil pressure by the injection cylinder and the injection grease cylinder The grease in the rod chamber is pressed into the oil sac. It is required that the pressure of the grease can be arbitrarily adjusted in the range of 0.4 to 2.0 MPa, and the speed of the grease injection is 2.3L/min. Because these two indexes are relatively easy to implement in the hydraulic system, the following No longer discussed.
Since three grease pockets are to be greased at the same time, three grease injection cylinders are to be set. After the grease in the grease injection cylinder is filled, the grease is injected into the grease injection cylinder through the high pressure grease pump. The hydraulic oil in the hydraulic cylinder There must not be any leakage into the grease end, otherwise it will affect the service life of the drill bit. It takes a total of 5 minutes for each drill bit to tighten the seal head from the preparation of grease injection to the end of grease injection, and the hydraulic system pressure grease injection time does not exceed 90s. It only accounts for a small part of the working cycle time. Therefore, the system must consider the energy saving problem.
After the hydraulic pump is started, the entire system enters the working state. When the grease needs to be injected, the 1DT is energized. After the hydraulic oil passes through the one-way pressure reducing valve 11, it acts on the rod cavity of the grease injection cylinder and presses the grease contained in the rodless cavity. In the grease filling cavity of the roller cone drill bit, until sufficient time has passed to fill the grease injection cavity. When it is necessary to adjust the injection pressure, it can be adjusted by the remote relief valve.
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