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

The invention relates to a sampling device for soil monitoring, and belongs to the technical field of soil monitoring. The sampling device for the soil monitoring comprises a machine frame; sliding rails are mounted in the machine frame; a sliding plate is arranged on the sliding rails; the sliding plate is provided with a hydraulic driving device and a rotating motor; a screw rod with a drill bitis mounted at the lower end of the rotating motor; an annular post is mounted outside the screw rod; a cutter head is mounted at the lower end of the annular post. According to the sampling device for soil monitoring, the pressure of the annular post entering soil is greatly reduced by matching the screw rod with the drill bit with the rotating motor and the hydraulic driving device; the samplingspeed and the sampling depth are improved; through an electric telescopic rod and a sampler which is rotationally connected with the electric telescopic rod, the required soil at various depths can be taken out at one time conveniently; the sampling error caused by mutual contaminating of the soil at different depths is avoided; and the work efficiency is improved.

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.

The invention relates to a submarine sampling device and aims at providing a bolt-free gravity piston type long cylindrical sediment fidelity sampler. The sampler comprises a fidelity sampling barrel, a stream guidance cabin, an accumulator, a hermetic cabin, a movement weight mechanism, a hanging bracket, and the like. The stream guidance cabin is sleeved with the upper end of a fidelity barrel body; and the hermetic cabin is movably sleeved with the fidelity barrel body and separated from the stream guidance cabin. The hanging bracket comprises plywood, a piston, a main cable and a hermetic cabin cable, wherein the main cable penetrates through the plywood and connects with the piston positioned in a bushing; and the hermetic cabin cable penetrates through the plywood and connects with the upper end of the hermetic cabin. The bolt-free gravity piston type long cylindrical sediment fidelity sampler based on sampling caliber optimization increases the sampling depth. The sampler scheme of a bolt-free mechanism avoids sample pressure maintaining failure caused by the miswork of a bolt. Based on a water flushing technology on the wall of a cofferdam, the sampler enhances the sealing property of the lower seal of the lower hermetic cabin.

The invention discloses a cyclone type jetting drill bit. The drill bit comprises a drill bit body with a hollow cavity, wherein the middle of the end part of the drill bit body is provided with a sampling port communicated with the hollow cavity, the end part of the drill bit body is provided with a cutting tool bit used for drilling and sampling, the position on the wall of the drill bit body, which is close to the cutting tool bit, is provided with an eddy-flow jetting hole communicated with the hollow cavity, and the central line of the eddy-flow jetting hole and the axis of the drill bit body are mutually staggered in the space. According to the cyclone type jetting drill bit disclosed by the invention, coal dust is pressed into a sampling passage by jetting out rotary compressed air so as to achieve the aim of quickly and accurately carrying out the operation of sampling; and moreover, the sampling time can be saved, the sampling time is reduced to about 2 to 5 minutes, the increase of the sampling depth reaches more than 100 meters, the working efficiency and the safety of the sampling of a coal mine are enhanced, and the disaster accident of gas is lowered.

The invention relates to the field of environmental detection devices, and specifically discloses a soil sampling and detection device. The soil sampling and detection device comprises a vehicle body,a control system and a soil detector provided on the vehicle body, a platform connected to the vehicle body, and a soil sampler connected to the platform, and further comprises a first plate body anda second plate body connected to the platform, wherein both the first plate body and the second plate body can be inserted into soil, the first plate body can be tilted back and forth along the platform to dig out, in cooperation with the second plate body, the soil in an area between the first plate body and the second plate body, and the soil sampler is located outside an area surrounded by thefirst plate body and the second plate body and is arranged near the second plate body. According to the soil sampling and detection device, after the soil on one side of the soil sampler is dig out by using the first plate body and the second plate body, the soil sampler is inserted into a target area near an area where the soil has been dig out by using sampling cylinders, and thus resistance from the surrounding soil to the soil sampler during which the soil sampler is inserted into soil is reduced, sampling efficiency is improved, and sampling depth is deepened.

The invention discloses an aggregate sampling device, a hot aggregate bin and an asphalt mixing plant. The aggregate sampling device comprises a sampling tube (1), screw conveying blades (2) and a rotary driving device, wherein a sampling port is arranged at one end of the sampling tube (1), the sampling port extends into the hot aggregate bin, the other end of the sampling tube (1) is fixed on the side wall of the hot aggregate bin, a mounting seat is arranged at the fixed end, an unloading outlet is arranged on the sampling tube (1), and the unloading outlet is connected with an unloading branch (5); the screw conveying blades (2) are mounted in the sampling tube (1) and used for conveying aggregate to the unloading branch (5); and one end of a rotating shaft of the screw conveying blades (2) is mounted on the mounting seat and fixedly connected with the rotary driving device, and the rotary driving device is used for driving the screw conveying blades (2) to rotate. By adopting the aggregate sampling device, the sampling depth can be increased, so that the accuracy in aggregate sampling can be further improved, and the operation is simple and convenient.

The invention discloses a sampling device for soil heavy metal detection. The sampling device comprises a sampling cylinder, a knocking assembly and a stabilizing assembly, the knocking assembly comprises a hammer head, a traction rope, a bundling barrel and a power assembly; the hammer head is vertically arranged above the sampling cylinder in a hoisting manner; the stabilizing assembly comprises a sleeve and a voltage divider; the lower end of the sleeve is correspondingly embedded into the ground; the sampling cylinder comprises a plurality of unit sections which are spliced with one another; and the unit sections are sequentially inserted into the sleeve from the top in an embedded mode and hit into an underground area through the hammer head. By smashing the sampling cylinder into the ground, it can be guaranteed that personnel are far away from equipment during construction, and safety is high; and the stabilizing assembly with high stability is used for guiding the deep path of the sampling cylinder, so that the sampling precision is further improved.

The invention relates to a sampling calculating method of tobacco-planting soil acidification degree. The method includes steps of (1), confirming a testing point; (2), excavating a sampling pit; (3), confirming a sampling level; (4), sampling every sampling layer; (5), testing pH value of the soil sample; (6), determining every level of sample above the middle part of the pit as the sample of a plough layer; taking the sampling layer in the middle part of the pit as the sample of the transition layer, and taking samples as the reference data; taking the sample of every sampling layer beneath the middle part of the pit as a bottom layer sample; (7), calculation of acidification layer. Through classifying the sample of every soil layer, the influence ranges of ecological condition, farming, fertilizing and other change factors on pH value are confirmed, the influence range of soil mother rock, vegetation type and other fixing factors on the pH value are determined, thereby providing exact basis for the calculation of the acidification layer. Compared with the regular method such as sampling calculating method or testing method in calendar years, the application method is more exact, and more capable of preventing and controlling soil acidification.

The invention relates to the technical field of soil detectors, and discloses a soil detector for detecting soil acidity and alkalinity properties, the soil detector comprises a first mounting plate, a second mounting plate and a third mounting plate, and the first mounting plate, the second mounting plate and the third mounting plate are sequentially arranged from bottom to top. The soil sampling mechanism is improved, a guide sleeve is arranged, when sampled soil is conveyed to a lifting sleeve, due to the fact that the bottom end of the guide sleeve is subjected to closing-up treatment, blocky soil is ground at the closed-up position in the conveying process, the ground soil is granular, the granular soil is conveyed by a spiral conveying guide strip, and the soil sampling efficiency is improved. The soil entering the lifting sleeve can be ground again, so that the soil is in a sand grain state, and the device has the advantages that after the sampled soil is ground, in the detection process, the pH value in the soil can be more conveniently released, the pH value releasing and diluting speed is increased, the detection efficiency is improved, and more time is saved.

The invention belongs to the technical fields of geotechnical engineering and geological engineering, relates to a soft rock sampling device, and especially relates to a test device for onsite investigation and sampling of geotechnical engineering. The main body structure of the device includes wheels, a rotating support, a handle, an electrical controller, a connecting wire, a driving motor, a thin walled sampler, a top soil plate, a water discharging hole, a vertical spiral propelling rod, a rack and pinion steering gear, a vehicle frame, a horizontal spiral propelling rod and a precession block. The device has the advantages of reduction of the disturbance to an undisturbed soil sample, realization of the study of the engineering characteristics of a rock mass, according with the engineering practice of the rock mass, increase of the sampling efficiency, realization of sampling and studying at any time, and reduction of the influences of the stress history on the rock sample.

The invention discloses a helical dual-tube tailing area slag sampling device and a method thereof. The sampling device comprises an outer tube and an inner tube, wherein the outer tube main body is an outer tube body; an outer wall of the outer tube body is provided with a thread; an outer side of an upper part of the outer tube body is provided with a beeline handle; the beeline handle is provided with an outer tube fixing hole, and matched with an L-shaped fixing bolt; a lower part of the outer tube body is provided with a sampling door opening and a conical head; the inner tube main body is an inner tube body; an outer side of an upper part of the inner tube body is provided with a cross-shaped handle; the cross-shaped handle is provided with an inner tube fixing hole; the side edge ofthe lower part of the inner tube body is provided with a sampling door; and the sampling door is connected with the inner tube body through a spring hinge. The helical dual-tube tailing area slag sampling device has the advantages of simple structure, low cost, durability, convenience in carrying, high sampling efficiency, wide applicability and the like.

The invention relates to a submarine sampling device and aims at providing a bolt-free gravity piston type long cylindrical sediment fidelity sampler. The sampler comprises a fidelity sampling barrel, a stream guidance cabin, an accumulator, a hermetic cabin, a movement weight mechanism, a hanging bracket, and the like. The stream guidance cabin is sleeved with the upper end of a fidelity barrelbody; and the hermetic cabin is movably sleeved with the fidelity barrel body and separated from the stream guidance cabin. The hanging bracket comprises plywood, a piston, a main cable and a hermetic cabin cable, wherein the main cable penetrates through the plywood and connects with the piston positioned in a bushing; and the hermetic cabin cable penetrates through the plywood and connects withthe upper end of the hermetic cabin. The bolt-free gravity piston type long cylindrical sediment fidelity sampler based on sampling caliber optimization increases the sampling depth. The sampler scheme of a bolt-free mechanism avoids sample pressure maintaining failure caused by the miswork of a bolt. Based on a water flushing technology on the wall of a cofferdam, the sampler enhances the sealing property of the lower seal of the lower hermetic cabin.

The invention discloses a sampling device. The sampling device comprises a main sampling pipe and at least one accessory sampling pipe; the accessory sampling pipe and the main sampling pipe are connected via a locking assembly; the locking assembly comprises a locking female joint and a locking male joint; the locking female joint is provided with a locking groove, and the locking male joint is provided with a locking key capable of realizing matched clamp connection with the locking groove; the locking assembly also comprises a locking buckle used for preventing slipping of the locking key from the locking groove. According to the sampling device, the sampling device is provided with the locking assembly, so that when the main sampling pipe and the accessory sampling pipe are inserted into a grain heap, the whole sampling device is capable of realizing anticlockwise and clockwise moving, losening of the connection part of the main sampling pipe with the accessory sampling pipe is avoided, sampling depth of the sampling pipes are increased effectively, downward movement efficiency of the sampling pipes in sampling process is increased, the reliability of the connection part of the sampling pipes is improved, the service life of the sampling device is prolonged, and rapid connecting and detaching of the main sampling pipe with the accessory sampling pipe can be realized, and sampling time is shortened.

The invention provides an on-site sampling device for slurry in a goaf filling process and a use method thereof, belonging to the technical field of mine filling sampling. The device includes an outer sleeve, an inner sleeve, a cover plate and an L-shaped steel plate bracket. The outer sleeve is provided with an outer sleeve guide rail, and the inner sleeve is provided with an inner sleeve slide rail and a chute. Accurate, the inner casing can be inserted into the outer casing, the cover plate can be inserted into the chute, and the outer casing is fixed by a pair of L-shaped steel plate brackets and bottom plate fixing expansion bolts. The device adopts a separate casing structure, which can be assembled flexibly according to the sampling requirements. The structure is simple and the installation is quick. The inner casing can be reused to reduce costs, and the outer casing is retained in the filling body, which can be used as a reinforcement structure to improve the overall strength of the filling body. The sampling depth is large, typical and representative, and the sampling success rate is high. According to production needs, filling slurry can be taken out in situ, and filling bodies of different ages can also be taken out to meet different production inspection and test needs.

The invention discloses soil detection equipment for detecting deep soil, relates to the technical field of soil detection, and solves the problems that the detection depth of the detection equipment used at present is preferential, and the sampling depth cannot be greatly increased in a splicing combination manner. The soil detection equipment for detecting deep soil comprises a movable base, wherein the movable base further comprises a power socket and a square hole; four sets of universal wheels are fixedly arranged on the periphery of the bottom of the movable base; the middle of the top of the movable base is integrally provided with the power socket, the power socket is internally provided with a storage battery, sampling barrels are arranged and can go deep into the ground to directly sample soil, the sampling barrels can be combined and spliced through bolts, the sampling depth can be increased, and compared with common detection equipment, the sampling is more complete; and the sampling barrel is driven by a rotating sleeve to rotate, so that the soil can be directly extracted, and convenience is provided for detection.

The invention belongs to the technical field of sediment sampling equipment and relates to an undisturbed high-frequency vibration sediment sampler. The sampler comprises an outer bin; an inner bin is arranged on the upper portion of the interior of the outer bin; an eccentric motor is installed in the inner bin; the output end of the bottom of the eccentric motor is connected with an inner pipe; an outer pipe is arranged on the outer side of the inner pipe; a sampling mechanism is installed at the bottom end of the inner pipe; side holes are formed in the outer walls of the two sides of the outer bin; fixing rods are detachably connected to the outer walls of the two sides of the inner bin; a base is installed at the bottom of the outer bin; each fixing rod is of an L-shaped structure; The outer bin of the undisturbed high-frequency vibration sediment sampler can perform high-frequency vibration, so that a continuous sediment sample is obtained; undisturbed collection of seabed sediments is ensured; the internal sampling mechanism extends into the sample to perform sampling, so that the sampling depth can be increased, the structure of the sediment sample is prevented from being damaged, and the sediment sampling quality is improved.

The invention provides a slurry field sampling device in a goaf filling process and a use method thereof, and belongs to the technical field of mine filling sampling. The device comprises an outer sleeve, an inner sleeve, a cover plate and L-shaped steel plate supports; the outer sleeve is provided with an outer sleeve guide rail, the inner sleeve is provided with an inner sleeve sliding rail and a sliding groove, the inner sleeve sliding rail is aligned with the outer sleeve guide rail, the inner sleeve is inserted into the outer sleeve, the cover plate can be inserted into the sliding groove, and the outer sleeve is fixed through a pair of L-shaped steel plate supports and a bottom plate fixing expansion bolt. The device adopts a separated sleeve structure, can be flexibly assembled according to sampling requirements, and is simple in structure and quick to mount. The inner sleeve can be reused, the cost is reduced, the outer sleeve is reserved in filling bodies and can serve as a reinforcing structure, and the overall strength of the filling bodies is improved. The sampling depth is large, typical representativeness is achieved, and the sampling success rate is high. According to production requirements, filling slurry can be taken out in situ, and filling bodies of different ages can also be taken out, so that different production inspection and test requirements are met.

The invention discloses an undisturbed deep-scale sampling system for a seabed sedimentary layer, which comprises a sampling pipe mechanism, and the sampling pipe mechanism comprises a guide floral pipe, a heavy hammer, a sampling pipe, a lining pipe, a petal-type elastic sheet assembly and a knife edge; the lowering and recycling mechanism comprises a mooring rope connected with the heavy hammer; and the lowering and recycling mechanism drags the heavy hammer through the cable to lower the sampling pipe mechanism to the seabed and then release the traction force. The undisturbed deep-scale sampling system for the seabed sedimentary layer is simple and reasonable in structure and convenient to install and use. During sampling, disturbance to seabed sediment samples is small, and sample disturbance can be reduced or non-disturbance sampling can be achieved. The sampling depth is large, the rod-shaped heavy hammer strikes for 1-2 times during sampling each time, the sampling length can be controlled to be about 1m at one time, and the sampling depth can reach 40m after the operation is repeated. The length of the sample can be automatically calculated through the meter recording assembly. And large-area popularization and application are worthy.

The present invention is suitable for the electronic information technology field, and provides a circuit, method and device used for the array radar signal digitlization. The circuit comprises N sampling channels, M analog-to-digital converters and a logic controller, each sampling channel comprises L sampling unit sets, each sampling unit set comprises M sampling units, and each sampling unit comprises an input switch, a sampling and storage capacitor and an output switch. In each sampling unit, one end of the sampling and storage capacitor is connected with the input switch and the output switch simultaneously, in each sampling unit set, the other ends of the output switches of the M sampling units are in one-to-one correspondence connection with the M analog-to-digital converters, a writing control line and a reading control line of the logic controller are connected with the input switches and the output switches respectively, and N, M and L are natural numbers, thereby effectively improving the sampling depth of the array radar signals, at the same time, improving the sampling speed and the conversion precision of the array radar signals.

The invention belongs to the technical field of integrated circuits, and particularly provides an FPGA logic test method and device. The method comprises the following steps: based on a to-be-tested signal bandwidth and a sampling depth of a to-be-tested logic source code, determining a required resource storage amount required for testing the to-be-tested logic source code; if the required resource storage amount is smaller than the residual storage amount of the FPGA on-chip memory, determining that the storage mode is on-chip storage, otherwise, determining that the storage mode is off-chip storage, wherein the memory corresponding to the on-chip memory is an FPGA on-chip memory, and the memory corresponding to the off-chip memory is an external memory; and testing the to-be-tested logic source code based on the kernel of the embedded logic analyzer, and storing sampling data generated by the test into a corresponding memory according to the determined storage mode. According to the invention, the problem of low sampling depth caused by an internal storage space during FPGA testing can be avoided, so that the sampling depth during testing is effectively improved.

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.

The invention discloses a method for accurately locating a distribution network fault based on a D-PMU device. The method includes: 1) establishing a fault diagnosis model according to the configuration of the D-PMU of the distribution network; real-time communication acquisition based on the D-PMU and upload measurement data; 2) sort out the measurement data before and after the failure; judge whether there is a T connection line at both ends of the failure place, if it is to perform step 3), if not perform step 4); 3) identify the fault line and For non-fault lines, the measurement information of non-fault lines is merged; 4) Use the measurement data before and after the fault to solve the fault diagnosis model of the distribution network; 5) Calculate and sort out the fault location. The invention acquires the location of the fault and determines the exact location of the distribution network fault, which meets the needs of practical applications.

The invention discloses an ice-breaking seawater sampling device for sub-ice water environment monitoring, and relates to the technical field of marine monitoring. The ice-breaking seawater sampling device for sub-ice water environment monitoring includes a slide plate on which a rotating mechanism, an ice-breaking mechanism, a rewinding mechanism and a sampling mechanism are arranged. The first opening of the first opening is provided with a lower pressing rod, and the bottom end of the pressing rod extends to the bottom of the slide plate and is provided with a suction cup. The ice-breaking seawater sampling device for sub-ice water environment monitoring can not only increase the efficiency of seawater sampling through the cooperation of the second installation frame, the fixed plate, the third motor, the third rotating shaft, the rope winding frame and the traction rope. depth, while also increasing the sampling range of the device and reducing the time for seawater sampling.

The invention discloses an icebreaking type seawater sampling device for monitoring water environment under ice, and relates to the technical field of ocean monitoring. The icebreaking type seawater sampling device for monitoring the water environment under ice comprises a sliding plate; a rotating mechanism, an icebreaking mechanism, a winding mechanism and a sampling mechanism are arranged on the sliding plate; a mounting transverse plate is fixedly mounted at the top of the sliding plate; a first opening penetrating up and down is formed in the sliding plate, and a pressing rod is arrangedin the first opening; and the bottom end of the pressing rod extends to the position under the sliding plate and is provided with a sucker. According to the icebreaking type seawater sampling device for monitoring the water environment under ice, through cooperative use of a second mounting frame, a fixing plate, a third motor, a third rotating shaft, a rope winding frame and a traction rope, theseawater sampling depth can be increased, meanwhile, the sampling range of the device is increased, and the seawater sampling time is shortened.

The invention discloses engineering geology deep soil sampling equipment, and relates to the technical field of soil sampling, the engineering geology deep soil sampling equipment comprises a support, a sampling straight pipe is arranged in the middle of the support, the outer end of the sampling straight pipe is respectively connected with a moving frame and a shell from inside to outside, and the bottom end of the sampling straight pipe is provided with a base; the lower end of the base is slidably connected with a plurality of evenly-distributed soil scraping supports, the soil scraping supports can move to the outer side of the base in the direction away from the center position of the base, a vertically-through inclined groove is formed in the middle of each soil scraping support, and a soil scraping tool with the bottom end extending to the lower side of the corresponding soil scraping support is arranged in each inclined groove. The soil scraping device has the technical effects that the soil scraping support in an unfolded state can bear downward acting force applied by soil above the soil scraping support, so that upward counter-acting force borne by the soil scraping support in the soil cutting process is resisted, and the situation that equipment jumps and inclines due to the counter-acting force in the soil cutting process is avoided.

The invention discloses deep sampling equipment for geological detection, relates to the technical field of geological detection sampling detection, and mainly solves the problems that an existing geological detection sampling device is complex in structure, large in sampling rod size and inconvenient to carry. The device comprises a fixed column; a step table is arranged on the fixed column; a damping spring is arranged on the step table; a mounting plate is mounted on the fixed column; the mounting plate is connected with a damping spring through a locking nut; a motor is arranged on the mounting plate; the motor is connected with the output shaft; a driving gear is mounted on the output shaft; the driving gear is meshed with the driven gear; the driven gear is connected with a limitingframe; the limiting frame is connected with a connecting frame through a connecting column; the connecting frame is arranged to be in an L shape; a transmission rod is inserted into the driven gear; the transmission rod is connected with an extension rod; and the extension rod is connected with a drill bit. Large-depth sampling is achieved through the transmission rod, the extension rod and the drill bit.