CN108106896B - Sand hollow cylinder sample preparation device easy to operate and sample preparation method thereof - Google Patents

Abstract

The invention discloses a sandy soil hollow cylindrical sample preparation device and a sample preparation method thereof, wherein the sample preparation device comprises a base, an outer die, an inner die, a blanking assembly, a discharging compaction assembly and a tamping assembly, the blanking assembly comprises an annular fixed disk, a rotary disk is rotatably arranged on the annular fixed disk and positioned in a through hole, a hopper is arranged below the rotary disk, the discharging compaction assembly comprises a bearing plate, an annular pressure head and force transmission rods, pistons are arranged in the annular pressure head, a sleeve rod is slidably sleeved outside each force transmission rod, the tamping assembly comprises a scale rod, and a tamping hammer is slidably sleeved on the scale rod; the sample preparation method comprises the following steps of lifting the discharging compaction assembly along the guide rod by a certain height, uniformly spraying sandy soil on the upper end surface of the annular pressure head, enabling the sandy soil above the annular pressure head to fall into the bottom of the sample cavity, enabling the bottom of the annular pressure head to be pressed above the sandy soil of the sample cavity, and repeatedly falling the compaction hammer.

Description

Sand hollow cylinder sample preparation device easy to operate and sample preparation method thereof

Technical Field

The invention relates to a sample preparation device and a sample preparation method thereof, in particular to a sandy soil hollow cylindrical sample preparation device and a sample preparation method thereof, which are easy to operate.

Background

In the sample preparation process of the sandy soil hollow cylinder test, a common sample preparation method is a layered compaction method. The compaction tool is typically a long plastic vibrator or ring ram compactor. The long plastic rod vibration has the defects that the thickness of each layer is difficult to control, the flatness of the surface of each layer is difficult to control and the like; the annular pressure head compactor has the defects that the latex films on the inner wall and the outer wall are easily damaged when the pressure head is repeatedly taken out and installed; the method is difficult to effectively adapt to the condition of more layers, so that the layer thickness is larger, the difference between layers is more obvious, and the uniformity of a sample is influenced; and the larger layer thickness is often combined with the heavy hammer with larger self weight, so that the impact force of the hammer is larger, and the problems of cracks and the like in the sample are easily caused. In addition, the inner die matched by a manufacturer consists of a valve inner die and a drawing plate, the lower end of the inner die is embedded in the shallow groove, the upper end of the inner die is free from constraint, and the inner die is easy to incline at the initial stage of sample preparation, so that the wall thickness of a sample is inconsistent.

For example, the present invention, china patent publication No. CN 105181404a, discloses a frozen clay hollow cylindrical sample preparation device, which comprises a forcing rod, a stainless steel three-petal outer cylinder, an inner mold cap, a clamping ring, an upper pressure head with teeth, a fixing screw, a pulling plate, a stainless steel petal inner mold, a clamping ring with lugs, a hollow cylindrical sample, a lower pressure head with teeth, a bolt for fixing the bracket, a bracket and a lower base, wherein the forcing rod has a cross section of "pi" shape, the stainless steel three-petal outer cylinder is arranged in the forcing rod, the stainless steel three-petal outer cylinder is sleeved with the stainless steel petal inner mold, the stainless steel petal inner mold passes through the upper pressure head with teeth to reach the lower pressure head with teeth, the inner mold cap is arranged at the top end of the stainless steel petal inner mold, a pulling plate with a rectangular outer and a bow is embedded in the middle of the stainless steel petal inner mold, the upper pressure head with teeth and the lower pressure head with teeth are separated, the hollow cylindrical sample is arranged between the stainless steel three-petal outer cylinder and the stainless steel petal inner mold, the upper and lower parts of the stainless steel three-piece outer barrel are provided with a clamping ring which is fastened by a fixing screw, the middle part of the stainless steel three-piece outer barrel is provided with a clamping ring with an ear, the clamping ring is connected with a stainless steel bracket and fastened by a bolt of the fixing bracket, and the base is contacted with the bottom of the sample preparation device. For another example, the chinese invention of the prior publication No. CN 104374625 a discloses a "semi-automatic multifunctional geotechnical test sample pressing device", which comprises an oil tank, a motor, a hydraulic pump, a hydraulic cylinder, a control mechanism, and a movable sample pressing platform, wherein the movable sample pressing platform is fixed on a base through a bracket, the motor is connected with the hydraulic pump, the oil tank is connected with the hydraulic pump through a pipeline, and the oil tank is fixed on the bracket; the hydraulic cylinder is arranged in the center of the base, the upper part of the hydraulic cylinder is fixed with the movable sample pressing platform, and a displacement meter for measuring the axial displacement of the movable sample pressing platform is arranged in the movable sample pressing platform; the control mechanism is fixed on the side column, and the position of the movable sample preparation platform is detected in real time through the control motor. However, when the methods are used for remolding soil samples, each time the soil sample is added, the whole sample pressing hammer is taken out of the cavity and installed, and the sample pressing hammer is easy to rub, pull and damage the inner and outer latex films, so that the method is usually used under the condition that the number of layers is less and is generally suitable for the condition that the number of layers is not more than 5.

Disclosure of Invention

The invention aims to solve the first technical problem and provides a sandy soil hollow cylindrical sample preparation device which is simple to operate, can be suitable for the condition that the number of layers of a sample soil body is large, is not easy to damage an inner latex film and an outer latex film, can effectively prepare a sandy soil sample with high uniformity, can effectively fix an inner mould, prevents the inner mould from inclining and has the characteristic of convenience in operation.

The second technical problem to be solved by the invention is to provide a sandy soil hollow cylindrical sample preparation method which is simple to operate, is suitable for the condition that the number of soil layers of a sample is large, is not easy to damage an inner latex film and an outer latex film, can effectively prepare a sandy soil sample with high uniformity, can effectively fix an inner mould, prevents the inner mould from inclining, and has the characteristic of convenience in operation.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides an operation simple and easy hollow cylinder sample preparation device of sand, includes the base, sets up outer mould on the base, sets up the inner mould in outer mould, forms the sample chamber that is used for the shaping sample between outer mould and the inner mould, its characterized in that: the sample preparation device further comprises a blanking assembly, a discharging compaction assembly and a tamping assembly.

The blanking assembly comprises a supporting rod and two guide rods, the supporting rod and the two guide rods are vertically arranged outside the outer die, an annular fixing disc is transversely arranged at the top of the supporting rod, the guide rods penetrate through the annular fixing disc and support the annular fixing disc through fixing rings, a rotary disc is arranged in a through hole in the annular fixing disc, a rotary motor is arranged on the annular fixing disc, the output end of the rotary motor is provided with a worm, a turbine part matched with the worm is formed on the outer wall of the rotary disc, and a funnel is arranged below the rotary disc.

The discharging compaction assembly comprises a stainless steel bearing plate, a stainless steel guide part, a stainless steel annular pressure head and a plurality of stainless steel dowel bars, wherein the stainless steel guide part is connected with the bearing plate and is arranged on the guide rod in a sliding manner; a plurality of through holes are uniformly formed in the annular pressure head in the circumferential direction, a spot facing part is formed in each through hole on the bottom end surface of the annular pressure head, a stainless steel piston in a shape matched with the spot facing part is arranged in each spot facing part, and a net rack connected with each piston is arranged at the upper part of the annular pressure head; the outside slip cover of every dowel steel is equipped with the loop bar, and the lower extreme and the rack of all loop bars are connected, and the upper end and a connecting ring of all loop bars are fixed, and it has the perforation that matches with the dowel steel to open on the connecting ring, and go up the outside of lower extreme loop bar of connecting ring and be provided with the spring, is located to correspond on every dowel steel and is provided with a spring gag lever post under the spring.

The tamping component comprises a top cover which is arranged at the top of the inner mould and is matched with the inner mould, a graduated scale rod which penetrates through the bearing plate and is provided with scales, and a tamping hammer which is sleeved on the graduated scale rod in a sliding way; the upper part of the top cover is fixed with the lower end of the scale rod through threads.

As the improvement, be located every through hole department on the up end of annular pressure head and be formed with the annular, the through hole is located the tank bottom of annular, and the cell wall of annular inclines to through hole bottom direction, and the cell wall top of adjacent annular intersects in a line, through set up an annular on every through hole upper portion, guarantees that the sand in the sample intracavity can more enough fall into to the through hole along the cell wall of annular, prevents that the sand from piling up in the bottom in sample chamber.

And the upper end surface of the annular pressure head is provided with an outer check ring close to the outer diameter, and an inner check ring close to the inner diameter, so that the sandy soil is prevented from falling into a gap between the annular pressure head and the inner wall of the outer mold after being accumulated at a certain height in the sample cavity.

Compared with the prior art, the invention has the advantages of solving the first technical problem: the invention utilizes the rotary motor to drive the rotary disc to rotate through the worm gear and the worm to realize the uniform blanking of the funnel, meanwhile, the invention arranges a spot facing part on the stainless steel annular pressure head and is lapped with a stainless steel piston which is matched with the spot facing part, in the blanking process, the method of compressing the spring by the connecting ring is utilized to force the piston to move downwards to open the countersink part, so that the sand above the annular pressure head uniformly falls into the bottom of the sample cavity, in the compaction process, the self tension of the spring is utilized to ensure that the piston moves upwards to close the countersink part, so that the lower end surface of the annular pressure head is a rigid flat surface, thus not only ensuring that the surface of each layer of sandy soil is flat and uniform, and avoids taking out and installing the device when feeding materials in layers each time, simplifies the sample preparation process, has the advantages of convenient operation and uneasy damage to the inner and outer latex films, in addition, adopts the top cover matched with the top of the inner mould, and the side displacement of the upper end of the inner die is restrained by a graduated rod which is embedded into the top cover and penetrates through the bearing plate.

The technical scheme adopted by the invention for solving the second technical problem is as follows: a sample preparation method for a sandy soil hollow cylinder sample, which is simple to operate, is characterized by comprising the following steps:

(1) designing the times of layered compaction, and calculating the sand and soil amount and the compaction height added each time;

(2) the unloading compaction assembly is lifted for a certain height along the guide rod, in the process, the bearing plate moves upwards along the guide rod, the bearing plate drives the annular pressure head to move upwards through the dowel bar, meanwhile, the bearing plate drives the net rack and the piston to move upwards along with the annular pressure head through the spring and the loop bar, the lifting height is larger than the height of sandy soil formed after the sandy soil is poured into the sample cavity, and the vertical position of the bearing plate is fixed by using the fixing clamp clamped on the guide rod;

(3) adding the sand amount corresponding to the time into the funnel, enabling the rotary motor to act, enabling the worm to drive the whole rotary disc to rotate for 2-5 circles through the turbine, and uniformly spraying the sand in the funnel on the upper end face of the annular pressure head;

(4) the rotary motor stops rotating, the connecting ring is shifted downwards, the connecting ring, the sleeve rod and the piston move downwards, the spring is compressed, each piston in the annular pressure head moves downwards to open the counter boring part, and sandy soil above the annular pressure head falls into the sample cavity;

(5) loosening the connecting ring, and under the tension action of the spring, resetting each piston to block the spot facing part of the annular pressure head again;

(6) loosening the fixing clamp, enabling the discharging compaction assembly to move downwards, and enabling the bottom of the annular pressure head to be pressed above the sandy soil of the sample cavity;

(7) repeatedly dropping the ramming hammer until the bearing plate reaches the design height on the scale rod;

(8) and (5) repeating the steps (2) to (7) until the sample preparation is finished.

Compared with the prior art, the invention has the advantages of solving the second technical problem: the invention utilizes the layering compaction method to prepare the sandy soil hollow cylindrical sample, calculates the amount of sandy soil added each time and the tamping height by presetting the layering times, utilizes a rotary motor to drive a rotary disc to rotate through a worm gear in each compaction process, realizes the uniform blanking of a funnel, simultaneously, the invention arranges a countersink part on a stainless steel annular pressure head and is lapped with a stainless steel piston which is matched with the countersink part, utilizes a method of a connecting ring to compress a spring in the blanking process, forces the piston to move downwards to open the countersink part, ensures that the sandy soil above the annular pressure head uniformly falls into the bottom of a sample cavity, utilizes the self tension of the spring in the compaction process to ensure that the piston moves upwards to seal the countersink part, and ensures that the lower end surface of the annular pressure head is a rigid flat surface, thus not only ensuring that the surface of each layer of sandy soil is flat and uniform, but also avoiding taking out and installing a device in each layering feeding, the sample preparation process is simplified, the sample preparation device has the advantages of convenience in operation and difficulty in damaging the inner and outer latex films, and in addition, the top cover matched with the top of the inner mold is adopted, and the scale rod which is embedded into the top cover and penetrates through the bearing plate restrains the lateral displacement of the upper end of the inner mold.

Drawings

FIG. 1 is a sectional view of a sample preparation device for a sandy soil hollow cylinder sample, which is easy to operate in the embodiment of the present invention;

FIG. 2 is an exploded view of a sample preparation device for a sandy soil hollow cylinder sample, which is easy to operate in the embodiment of the invention;

FIG. 3 is a schematic structural diagram of a sandy soil hollow cylinder sample preparation device which is simple in operation in the embodiment of the invention;

FIG. 4 is a schematic structural view of the bottom of the annular indenter in an embodiment of the present invention;

FIG. 5 is a schematic top view of the top of the annular indenter in an embodiment of the present invention;

FIG. 6 is an enlarged view of a portion of FIG. 1 at A;

FIG. 7 is a schematic view of the connection structure of the connection ring, the loop bar and the spring in the embodiment of the present invention;

fig. 8 is a schematic sectional view along the direction B-B in fig. 7.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 8, the sample preparation device for the sandy soil hollow cylinder sample, which is simple to operate in the embodiment, comprises a base 1, an outer mold 2, an inner mold 3, a blanking assembly 4, a discharging compaction assembly 5 and a tamping assembly 6.

Wherein, the outer die 2 is composed of a three-piece circular arc stainless steel sheet with a certain thickness and a central angle of 120 degrees, and is fixed by an upper and a lower clamping ring. The inner die 3 is formed by butt joint of two semicircular stainless steel cylinders and a stainless steel pulling plate. The bottom ends of the outer mold 2 and the inner mold 3 are embedded in the annular shallow groove on the top surface of the base 1. The inner mold 3 is disposed inside the outer mold 2, and a sample chamber 21 for molding a sample is formed between the outer mold 2 and the inner mold 3.

The blanking component 4 comprises a support rod 41 and a guide rod 42 which are vertically arranged outside the outer die 2, in the embodiment of the invention, the support rod 41 is one, the guide rod 42 is two, an annular fixed disk 43 is transversely arranged on the top of the support rod 41, the guide rod 42 penetrates through the annular fixed disk 43, a through hole is formed in the middle of the annular fixed disk 43, a rotary disk 44 is rotatably arranged on the annular fixed disk 43 and positioned in the through hole, a rotary motor is arranged on the annular fixed disk 43, the output end of the rotary motor is provided with a worm, a turbine part matched with the worm is formed on the outer wall of the rotary disk 44, a gearbox is arranged between the turbine part and the worm, the rotary speed of the rotary disk 44 can be conveniently adjusted according to different soil samples, a funnel 45 is arranged below the rotary disk 44, specifically, the funnel 45 is connected with the rotary disk 44 by adopting a connecting rod, and in order to ensure, so that add enough sandy soil at every turn, the connecting rod of adoption is not the straight-bar, connecting rod upper end and gyration dish 44 junction can 180 degrees of axial rotation, be convenient for add sand in to funnel 45, funnel 45 below is formed with a straight tube 451, be equipped with the valve in the straight tube 451, the valve can be opened when funnel 45 is rotatory, during the unloading, funnel 45 below straight tube is located the centre of interior mould 3 and outer mould 2, and vertical outer mould 2 top edge or deep sample intracavity of being close to, thereby leak outward of soil sample when avoiding the rotation.

Unloading compaction subassembly 5 is including sliding the bearing plate 51 that sets up on guide bar 42, the annular pressure head 54 that sets up in sample chamber 21 slides, six dowel steel 521 of hoop equipartition between bearing plate 51 and the annular pressure head 54 of fixed connection, wherein, annular pressure head 54 and interior mould 3, have 0.5 millimeter's space between the outer mould 2 respectively, and scribble emollient on interior mould 3 outer wall and outer mould 2 inner wall, make things convenient for annular pressure head 54 to remove, the last guide part 511 that has extended of bearing plate 51, guide bar 42 slides and sets up on guide part 511, it has two effects: firstly, the vertical movement of the discharging compaction assembly 5 is ensured; secondly, in cooperation with a fixing clamp, the vertical position of the bearing plate 51 is fixed during discharging, two circles of through holes 541, 12 outer circles and 12 inner circles are uniformly arranged on the annular pressure head 54, a counter-boring part 542 is arranged in each through hole 541 on the lower end surface of the annular pressure head 54, a piston 59 matched with the counter-boring part 542 in shape is arranged in each counter-boring part 542, the shape and structure of the counter-boring part 542 is consistent with that of the piston 59, the bottom surface of the annular pressure head 54 is flat after the piston 59 closes the counter-boring part 542, a net rack 55 connected with each piston 59 is arranged on the upper part of the annular pressure head 54, a sleeve rod 522 is slidably sleeved outside each force transmission rod 521, the lower ends of all the sleeve rods 522 are connected with the net rack 55, the upper ends of all the sleeve rods are fixed with a connecting ring 53, 6 through holes matched with the force transmission rods are arranged on the connecting ring 53, and the connecting ring 53 and the sleeve rods 522 can, the spring 56 is arranged outside the loop bar 522 at the lower end of the connecting ring 53, a spring limiting rod 58 is arranged on each force transmission rod 521 and located below the corresponding spring 56, the bottom end of the spring 56 is prevented from moving downwards, the spring 56 is initially set in a compressed state, the connecting ring 53, the loop bar 522, the net rack 55 and the counter-boring part 542 are forced to move upwards, the counter-boring part 542 is ensured to be completely closed without external force, further, the cross section of the net rack 55 is circular, the diameter of the net rack 55 is 1 mm, sand is ensured not to be accumulated on the net rack, the opening area of the counter-boring part 542 is ensured to be large enough when the counter-boring part 542 is opened, the sand can pass through the net rack 55, the loop bar 522 and the connecting ring 53, and the bearing plate 51, the annular pressure head 54, the force transmission rods 521 and the piston 59 in the.

The tamping component 6 comprises a top cover 61 which is arranged at the top of the inner die 3 and is matched with the inner die, and a graduated rod 62 which is vertically fixed on the top cover 61 and is provided with scales, wherein the graduated rod 62 penetrates through the force bearing plate 51, and a tamping hammer 63 is sleeved on the graduated rod 63 in a sliding manner. It is worth mentioning that the inner mold 3 is most likely to tilt at the initial stage of sample preparation because there is no or little soil around the inner mold 3 at the initial stage of sample preparation, and the lateral constraint is small, and the lateral tilt is likely to occur when there is no constraint or artificial constraint at the upper end, and in addition, although the graduated rod 62 is fixed on the top cover 61, the ramming hammer 63 is rammed on the bearing plate 51, so that the top cover 61 is only affected by gravity and not affected by ramming vibration, and further, the graduated rod 62 may be provided with a movable stopper, so that the ramming hammer 63 falls at a consistent height every time.

In addition, a ring groove 543 is formed at each through hole 541 on the upper end surface of the annular indenter 54, the through holes 541 are located at the bottom of the ring groove 543, the groove walls of the ring grooves 543 incline towards the bottom of the through holes 541, the top of the groove wall of each adjacent ring groove 543 intersects with one line, and by arranging a ring groove 543 on the upper portion of each through hole 541, it is ensured that the sand in the sample chamber 21 can fall into the through holes 541 along the groove walls of the ring grooves 543, preventing the sand from accumulating at the bottom of the sample chamber 21, further, the ring groove 543 is a tapered ring groove, an inner concave surface is formed on the side wall of the ring groove 543, the position of the connecting wall between the adjacent tapered ring grooves is highest, and the connecting wall is also in a tapered design, the slope of the groove wall of the tapered ring groove is 40-60 degrees, and by preferentially adopting a tapered ring groove structure, it is convenient to completely fall the sand above the annular indenter 54 into the bottom of the sample chamber 21, and in addition, an outer convex (ii) a Meanwhile, an outer retainer 545 is arranged on the upper end surface of the annular pressure head 54 close to the outer diameter, an inner retainer 544 is arranged close to the inner diameter, the inner retainer 544 is externally tangent to the transmission rod 521, the wall thickness of the retainer is 1-2mm, and the height of the retainer is 60mm, so that the sandy soil is prevented from falling into a gap between the annular pressure head 54 and the inner wall of the outer die 2 after the sandy soil is accumulated at a certain height in the sample cavity 21.

In addition, the installation method of the sandy soil hollow cylindrical sample preparation device with simple operation comprises a primary assembly step and a subsequent assembly step.

Only installing a discharging compaction assembly during initial assembly, and comprising the following steps:

(1) the lower end of the dowel bar 521 is connected with the annular pressure head 54;

(2) the spring 56 is sleeved outside the loop bar;

(3) the net rack 55, the loop bar 522 and the connecting ring 53 are sleeved on the dowel bar 521, and the spring 56 is positioned above the limiting rod;

(4) connecting the net frame 55 with each piston 59;

(4) and the upper end of the dowel bar 521 is connected with the force bearing plate 51.

Only the subsequent assembly is needed before each test, and the steps are as follows:

(1) firstly, installing a base 1, an outer die 2 and an inner die 3;

(2) a top cover 61 is arranged on the top of the inner die 3;

(3) a supporting rod 41 and a guide rod 42 are installed, and an annular fixed disc 43 is arranged on the supporting rod 41;

(4) a rotary disc 44 and a funnel 45 are installed;

(5) the discharging compaction assembly 5 is installed, and the guide part 511 is sleeved outside the guide rod;

(6) and a scale rod 62 penetrates through the bearing plate 51, is installed on the top cover 61, and a tamping hammer 63 is sleeved on the scale rod 62.

Finally, the invention also provides a sample preparation method of the sandy soil hollow cylindrical sample, which is simple and easy to operate and comprises the following steps:

(1) designing the layering compaction times, and calculating the sand and soil amount and the compaction height added each time, wherein in the embodiment of the invention, the layering compaction times are designed to be 10 layers;

(2) the unloading compaction assembly 5 is lifted to a certain height along the guide rod 42, in the process, the bearing plate 51 moves upwards along the guide rod 42, the bearing plate 51 drives the annular pressure head 54 to move upwards through the force transmission rod 521, meanwhile, the bearing plate 51 drives the net rack 55 and the piston 59 to move upwards along with the annular pressure head 54 through the spring 56 and the loop bar 522, the lifting height is larger than the height of the sandy soil 7 formed after the sandy soil is poured into the sample cavity 21, and the vertical position of the bearing plate 51 is fixed by using a fixing clamp clamped on the guide rod 42, wherein the unloading compaction assembly 5 can move upwards in a manual mode or be lifted by using a lifting device, and the unloading compaction assembly 5 is made of stainless steel, so that the unloading compaction assembly is heavy and has the advantage of labor saving by using the lifting device;

(3) adding the sand amount corresponding to the time into the funnel 45, rotating the motor to act, driving the whole rotating disc 44 to rotate for 2-5 circles by the worm through the turbine, and uniformly spraying the sand 7 in the funnel 45 on the upper end surface of the annular pressure head 54;

(4) the rotary motor stops rotating, the connecting ring 53 is pulled downwards, the connecting ring 53, the loop bar 522 and the net rack 55 move downwards, the spring 56 is compressed, each piston 59 in the annular pressure head 54 moves downwards to open the counter boring part 542, and the sandy soil 7 above the annular pressure head 54 falls into the bottom of the sample cavity 21;

(5) the connecting ring 53 is released, and under the tension of the spring 56, each piston 59 is reset to plug the spot facing portion 542 of the annular pressure head 54 again;

(6) the fixing clamp is loosened, the discharging compaction assembly 5 descends, and the bottom of the annular pressure head 54 is pressed above the sandy soil 7 of the sample cavity 21;

(7) repeatedly dropping the ramming hammer 63 until the force bearing plate 51 reaches the design height on the scale rod 62;

(8) and (5) repeating the steps (2) to (7) until the sample preparation is finished.

The invention utilizes the layering compaction method to prepare the sandy soil hollow cylindrical sample, calculates the sandy soil amount and the tamping height added each time by presetting the layering times, utilizes a rotary motor to drive the rotary disc 44 to rotate through a worm gear and a worm in each compaction process, realizes the uniform blanking of the funnel 45, simultaneously, the invention arranges the counter-boring part 542 on the stainless steel annular pressure head 54 and is overlapped with the adaptive stainless steel piston 59, utilizes the method of the connecting ring 53 to compress the spring 56 in the blanking process, forces the piston 59 to move downwards to open the counter-boring part 542, ensures the sandy soil above the annular pressure head 54 to fall into the bottom of the sample cavity 21 uniformly, utilizes the tension of the spring 56 to ensure that the piston moves upwards to close the counter-boring part 542 in the compaction process, ensures the lower end surface of the annular pressure head 542 to be a rigid flat surface, thus not only ensuring the flat and uniform surface of each layer of sandy soil, but also avoiding taking out and installing devices in each layering feeding, simplified the system appearance process, had convenient operation, should not harm the advantage of inside and outside emulsion membrane, in addition, adopt the top cap 61 with the top looks adaptation of inner mould 3 to through embedding top cap 61 and passing the side direction displacement of the upper end of bearing plate 51 restraint inner mould 3 of scale rod 62.

Claims (4)

1. The utility model provides an operation simple and easy hollow cylinder sample preparation device of sand, includes base (1), sets up outer mould (2) on base (1), sets up interior mould (3) in outer mould (2), forms sample chamber (21) that are used for the shaping sample between outer mould (2) and interior mould (3), its characterized in that: the sample preparation device also comprises a blanking component (4), a discharging compaction component (5) and a tamping component (6),

the blanking assembly (4) comprises a supporting rod (41) and a guide rod (42) which are vertically arranged outside the outer die (2), an annular fixed disc (43) is transversely arranged at the top of the supporting rod (41), the guide rod (42) penetrates through the annular fixed disc (43), a through hole is formed in the middle of the annular fixed disc (43), a rotary disc (44) is rotatably arranged on the annular fixed disc (43) in the through hole, a rotary motor is arranged on the annular fixed disc (43), a worm is arranged at the output end of the rotary motor, a worm wheel part matched with the worm is formed on the outer wall of the rotary disc (44), and a funnel (45) is arranged below the rotary disc (44);

the discharging compaction assembly (5) comprises a bearing plate (51) arranged on a guide rod (42) in a sliding manner, an annular pressure head (54) arranged in a sample cavity (21) in a sliding manner, and a plurality of force transfer rods (521) fixedly connected between the bearing plate (51) and the annular pressure head (54) and uniformly distributed in the circumferential direction, a plurality of through holes (541) are uniformly formed in the annular pressure head (54) in the circumferential direction, countersink parts (542) are formed in each through hole (541) on the lower end face of the annular pressure head (54), a piston (59) with a shape matched with the countersink parts (542) is arranged in each countersink part (542), a net rack (55) connected with each piston (59) is arranged on the upper portion of the annular pressure head (54), a sleeve rod (522) is sleeved outside the force transfer rods (521) in a sliding manner, the lower ends of all the sleeve rods (522) are connected with the net rack (55), and the upper ends of all the sleeve rods (522) are fixed with a, a through hole matched with the dowel bars is formed in the connecting ring (53), springs (56) are sleeved outside a lower end loop bar (522) of the connecting ring (53), and a spring limiting rod (58) is arranged on each dowel bar (521) and is positioned below the corresponding spring (56);

ramming subassembly (6) including set up in interior mould (3) top and with top cap (61) of its looks adaptation, vertical graduated rod (62) that have the scale on being fixed in top cap (61), bearing plate (51) is passed in graduated rod (62), and sliding sleeve is equipped with ramming hammer (63) on graduated rod (62).

2. The sandy soil hollow cylinder sample preparation device easy to operate according to claim 1, characterized in that: and a ring groove (543) is formed in the upper end face of the annular pressure head (54) at each through hole (541), the through holes (541) are located at the bottoms of the ring grooves (543), the groove walls of the ring grooves (543) incline towards the bottom of the through holes (541), and the top parts of the groove walls of the adjacent ring grooves (543) are intersected on a line.

3. The sandy soil hollow cylinder sample preparation device easy to operate according to claim 2, characterized in that: an outer check ring (545) is arranged on the upper end face of the annular pressure head (54) and close to the outer diameter, and an inner check ring (544) is arranged on the upper end face of the annular pressure head and close to the inner diameter.

4. A sample preparation method of the sandy soil hollow cylinder sample preparation device which is easy to operate according to any one of claims 1 to 3, characterized by comprising the following steps:

(1) designing the times of layered compaction, and calculating the sand and soil amount and the compaction height added each time;

(2) the unloading compaction assembly (5) is lifted for a certain height along the guide rod (42), in the process, the bearing plate (51) moves upwards along the guide rod (42), the bearing plate (51) drives the annular pressure head (54) to move upwards through the dowel bar (521), meanwhile, the bearing plate (51) drives the net rack (55) and the piston (59) to move upwards along with the annular pressure head (54) through the spring (56) and the sleeve rod (522), the lifting height is larger than the height of sandy soil (7) formed after the sandy soil is poured into the sample cavity (21), and the vertical position of the bearing plate (51) is fixed by the fixing clamp clamped on the guide rod (42);

(3) adding the sand amount corresponding to the time into the funnel (45), enabling the rotary motor to act, enabling the worm to drive the whole rotary disc (44) to rotate for 2-5 circles through the turbine, and uniformly sprinkling the sand (7) in the funnel (45) on the upper end face of the annular pressure head (54);

(4) the rotary motor stops rotating, the connecting ring (53) is shifted downwards, the connecting ring (53), the loop bar (522) and the net rack (55) move downwards, the spring (56) is compressed, each piston (59) in the annular pressure head (54) moves downwards to open the counter boring part, and the sandy soil (7) above the annular pressure head (54) falls into the bottom of the sample cavity (21);

(5) the connecting ring (53) is loosened, and under the tension action of the spring (56), each piston (59) is reset to re-block the spot facing part (542) of the annular pressure head (54);

(6) the fixing clamp is loosened, the discharging compaction assembly (5) descends, and the bottom of the annular pressure head (54) is pressed above the sand (7) of the sample cavity (21);

(7) repeatedly dropping the ramming hammer (63) until the force bearing plate (51) reaches the design height on the scale rod (62);

(8) and (5) repeating the steps (2) to (7) until the sample preparation is finished.

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