33results about How to "Increase sampling depth" patented technology

The invention discloses a grain quantitative sampler which comprises a body. A negative-pressure device, a sampling chamber, a splitting device and a sampling mechanism are arranged on the body. The negative-pressure device is connected to the sampling chamber and used for generating negative pressure in the sampling chamber, the wall surface of the sampling chamber is provided with a sampling port connected with a sampling tube, the bottom of the sampling chamber is provided with a discharging port, and a sampling switch mechanism is arranged at the discharging port which is connected to thesplitting device. An outlet of the splitting device is connected to the sampling mechanism, and the sampling mechanism comprises a sampling hopper for sample receiving and a weighing device for bearing the sampling hopper. The grain quantitative sampler has advantages that sampling is performed by vacuum suction, sampled samples are proportionally split through the splitting device and weighed inreal time through the weighing device, sampling quality of each layer of grains can be accurately controlled, and sample representativeness is guaranteed.

The invention discloses an anti-sloughing hole reverse circulation sampling bit comprising a bit body with an inner cavity and a hollow annular ejector arranged in the bit body. One end of the bit body is provided with inner, middle and outer cutter heads from interior to exterior, a sampling port is arranged on the inner cutter head, a clearance groove used for slagging is arranged between the middle and outer cutter heads, an annular ejector is fixedly arranged in the cavity of the bit body and forms an annular cavity with the inner wall of the bit body, and the sampling port is communicated with the hollow annular ejector; the bit body is provided with an ejecting hole correspondingly, and the ejecting hole is communicated with the annular inner cavity. The bit is easy to operate and is capable of sampling from soft and outburst seams rapidly and accurately, the sampling time is saved, the sampling depth is increased, the mine sampling efficiency and safety are improved, and the rate of gas accidents is decreased.

The invention discloses a D-PMU device-based power distribution network fault accurate positioning method. The method comprises the steps of 1) establishing a fault diagnosis model according to a D-PMU configuration condition of a power distribution network; acquiring and uploading measurement data based on real-time communication of the D-PMU; 2) arranging measurement data before and after a fault occurs; judging whether T-connection lines exist at the two ends of the fault position or not, if yes, executing the step 3), and if not, executing the step 4); 3) identifying a faulty line and a non-faulty line, and combining the measurement information of the non-faulty line; 4) solving the power distribution network fault diagnosis model by using the measurement data before and after the fault, and 5) performing calculating and sorting to complete fault positioning. According to the power distribution network fault diagnosis method, the position of the fault is obtained, the accurate position of the fault of the power distribution network is determined, and the requirements in practical application are met.

The invention relates to a monitoring and early-warning platform based on a biogas system energy utilizing efficiency method. The monitoring and early-warning platform comprises a body, a biogas slurry detecting unit, a biogas slurry storing unit, a biogas slurry collecting unit, a lifting unit and a warning unit, wherein the biogas slurry storing unit moves up and down relatively to the body; a water inlet valve and a water outlet valve of the biogas slurry storing unit are respectively arranged on a water inlet and a water outlet; a cushioning cavity is arranged at the water inlet valve; an impeller unit is arranged in the cushioning cavity and comprises a variable-pitch helical impeller assembly, a positioning bearing and a rotating shaft; for the blade shape of the nth (n is larger than or equal to 1 and less than or equal to N) variable-pitch helical impeller of the variable-pitch helical impeller assembly, the equations of a locus from one end near the water inlet valve to the other end of the variable-pitch helical impeller are Xi=r*cos (thetai+2PI*n / N), Yi=r*sin (thetai+2PI*n / N), Zi=(n-1)*(L+a) / N+(thetai / 2PI) m*(L-(N-1)a) / N; the biogas slurry collecting unit is used for conveying the biogas slurry in the cushioning cavity; and the lifting unit is used for enabling the biogas slurry storing unit to move up and down.

The invention discloses a lacustrine core sampling device for sediments in lakes with different depths. The lacustrine core sampling device comprises a handle rod, a drilling rod and a rotary core capturing device which are sequentially fixedly connected from top to bottom, wherein the rotary core capturing device comprises a sample pipe and a rotary blade, a sample pipe body is a semicircular groove body, a connecting rod connected with the drilling rod is arranged at the top end of the semicircular groove body, a drill bit is fixedly arranged on the outer side surface of the bottom end of the semicircular groove body, and two ends of the rotary blade are respectively rotatably connected to the top end and the bottom end of the semicircular groove body. According to the lacustrine core sampling device, the defect of an existing mechanical sediment sampler is overcome, the sampling success rate and the sample integrity are increased, lacustrine cores of water bodies and marshes in different depths are sampled through the arrangement of prolongable drilling rod and a hammer, the dismantling link is greatly simplified, the time is effectively saved, and the demand on research is also met.