By adopting the above scheme, a wedge-shaped mechanism is arranged between the base plate and the support plate. The wedge-shaped mechanism includes an upper wedge block and a lower wedge block. The upper surface of the upper wedge block is fixedly connected with the support plate by bolts, and the lower wedge block is driven to move by external force. The upper wedge block will move up and down along the slope of the lower wedge block, driving the support plate to move up and down, and then the height of the injection pipe can be adjusted.

The lower wedge block is fixedly connected with a screw, the screw is fixedly connected with a bearing, the screw is fixedly connected with the inner ring of the bearing, and the outer ring of the bearing is fixedly connected with the bottom plate.

By adopting the above scheme, by applying external force to the screw, the screw rotates in the bearing, and then drives the movement of the lower wedge block. The use of the screw is convenient for applying the force on the lower wedge block.

One end of the screw is provided with a hand wheel.

By adopting the above scheme, it is convenient to apply the force on the screw.

The upper surface of the bottom plate is provided with a sliding groove, and the wedge mechanism is slidably connected with the sliding groove.

By adopting the above scheme, the chute is favorable for the sliding of the wedge-shaped mechanism on the base plate, and plays a role in positioning the wedge-shaped mechanism.

The return pipe is fixedly connected with the return pipe, and the other end of the return pipe fixedly connected with the return pipe is inserted into the tank from the top of the feeding tank.

By adopting the above scheme, when there are too many crude oil drag reducers in the feed pipe of gear pump, the pressure of the pipe will be too large. The crude oil drag reducers will return more crude oil drag reducers to the feeding tank through the return pipe to avoid waste of crude oil drag reducers. In addition, the crude oil drag reducers in the return pipe will flow out of the bottom end of the feeding tank and into the top end of the feeding tank, It also stirs the crude oil drag reducer in the feeding tank.

The bottom end of the platform is fixedly connected with a directional wheel.

By adopting the above scheme, the bottom end of the platform is fixedly connected with a directional wheel to facilitate the movement of the platform.

The top of the charging tank is provided with a stirrer.

By adopting the above scheme, the top of the feeding tank is equipped with an agitator, which can agitate the crude oil drag reducer in the feeding tank, prevent the crude oil drag reducer from settling and affect the effect of the crude oil drag reducer.

In conclusion, the utility model has many beneficial effects: the device has compact structure, convenient installation, simple operation and high working efficiency.