4results about How to "Avoid depressurization" patented technology

The utility model discloses a continuous pressurizing device which comprises a continuous pressurizing assembly which comprises an air bag, an air outlet head communicated with the bottom face of the air bag, an air inlet head communicated with the side face of the air bag and a to-be-tested instrument tube arranged below the air bag. A connecting assembly, the connecting assembly comprises a round pipe arranged below the air outlet head, a threaded pipe communicating with the round pipe, a first groove opening formed in the outer wall of the round pipe, a connecting pipe arranged below the threaded pipe, a first internal thread formed in the connecting pipe, an annular baffle fixed to the outer wall of the connecting pipe and a conical connector communicating with the connecting pipe. The air inlet pipe is arranged at the air inlet head; and the valve is connected with the air inlet pipe. According to the utility model, the continuous pressurizing assembly and the connecting assembly are matched with each other, so that long-time continuous air pressure can be provided under the condition of no power supply, even if air inlet is interrupted, continuous pressurizing can still be ensured, the use is convenient, the cost is low, and the chromatography efficiency of the chromatographic column is improved.

The invention discloses a land surveying and mapping calibration device convenient to operate, and belongs to the technical field of land surveying and mapping calibration. A pressing plate is horizontally and fixedly mounted at the top end of the inserting rod, a mounting rod is vertically and fixedly mounted on the top wall of the pressing plate, and a marker post is arranged at the top end of the mounting rod; in the process that the threaded rod is rotated to adjust the height of the marker post, the piston rod moves downwards, on one hand, the deep anchoring clamping rod is mechanically driven to transversely stretch out to penetrate into soil according to the wedge-shaped principle, and deep anchoring is formed; on the other hand, the piston rod serves as an air pump piston to compress air in the cavity, the pneumatic telescopic rod on the earth surface is driven by the air supply mechanism to stretch and abut against the ground, and triangular support of the wide base is formed. The composite fixing mode of deep ground gripping and ground surface foundation expansion effectively solves the problem that a traditional surveying and mapping rod shakes due to the fact that the head is heavy and the bottom is light, additional power sources or tedious operation steps are not needed, and the stability of the device under wind interference or soft soil is remarkably improved.

A water pressure testing device, a clamping mechanism for clamping the product to be tested is installed on the workbench, a water pump is used to pump water in the water tank into the sealed pressure tank, an air pump is used to supply pressurized air to the sealed pressure tank, a first valve is arranged on the air path between the air outlet of the air pump and the air inlet of the sealed pressure tank, a second valve is arranged on the water path between the water outlet of the water tank and the water inlet of the sealed pressure tank, a third valve is arranged on the air path between the air outlet of the sealed pressure tank and the air inlet of the product to be tested, a fourth valve is arranged on the water path between the water outlet of the sealed pressure tank and the water inlet of the product to be tested, and a fifth valve is arranged on the water path between the water outlet of the product to be tested and the water tank. The water pressure testing device pressurizes the inside of the product to be tested with the air pump, the pressurization speed is faster, there is almost no loss of test water during the pressurization process, and the air pressure during pressurization is used for pressure relief and drainage, avoiding the need for additional equipment to depressurize the sealed pressure tank, and the structure is simple and reasonable.

This utility model provides a loss-in-weight scale with a leak-proof structure, including a box, support, clamping plate, dust cover, feeding assembly, first screening frame, second screening frame, loss-in-weight scale body, leak-proof assembly, feeding auger, drive motor, electric telescopic rod, rotating rod, and rotary motor. A clamping plate is provided at the feeding assembly position on the top of the box, and a dust cover is installed between the clamping plates. A support is also provided at the bottom of the box. Inside the box, a first screening frame is provided next to the feeding assembly, and multiple sets of electric telescopic rods are provided on both sides of the first screening frame. Each set of electric telescopic rods is equipped with a corresponding drive motor connected to the side of the box. A second screening frame is located directly below the first screening frame. This utility model has a reasonable structure, which can not only break up agglomerated powder particles but also remove impurities before weighing, greatly improving the accuracy of the loss-in-weight scale when weighing powder.