A pile foundation sampling device for road and bridge construction

Abstract

The present invention relates to the technical field of road detection devices, and specifically provides a pile foundation sampling device for road and bridge construction, which includes a cylinder frame. A driving disk is arranged inside the cylinder frame, and at least three milling cutter bits are rotatably arranged on the driving disk. The three milling cutter bits revolve along a circular trajectory and rotate at high speed. Compared with traditional cylinder drills, the contact area is reduced, the sampling accuracy is higher, and the surface of the sample core is smoother. A cleaning roller is also arranged on the driving disk, and the roller brush of the cleaning roller performs secondary treatment and cleaning on the surface of the sample core, facilitating subsequent processing of the sample core and improving the detection efficiency. At the same time, a rotating sleeve, a belt pulley and a limiting belt are arranged on the outer circumference of the drill rod of the milling cutter bit. The sample core is limited by multiple limiting belts, the limiting area is increased, the vibration of the sample core is reduced, and the stability is improved. In addition, a film covering component is arranged, and the sample core can automatically cover the film after entering the cover cylinder, effectively blocking the long-term contact between the sample core and air, preventing the oxidation of the surface of the sample core, improving the protection effect, and ensuring the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of road detection devices, and particularly to a pile foundation sampling device for road and bridge construction. Background Art

[0002] Road pile foundation sampling devices are mainly used to extract samples from road pile foundations for the detection and evaluation of material properties.

[0003] For example, Chinese Patent CN116718419A discloses a drilling and sampling device for road and bridge detection. The solution includes a support frame, a drill barrel, a knocking component, a detection component, and a driving component. Driven by the first driving unit and the second driving unit in the driving component, the drill barrel gradually samples on the road or bridge. After the drill barrel finishes sampling, the detection component detects whether there is a sample core inside the drill barrel. If the detection component detects that there is a sample core inside the drill barrel, the third driving unit starts to drive the knocking block to slide reciprocally along the slide rail, and the knocking block knocks the drill barrel to knock out the sample core stuck inside the drill barrel.

[0004] However, in the above solution, when sampling with a drill barrel, the contact area with the sample core is large, resulting in a large frictional force. The heat generated by friction will cause the properties of the surface layer of the sample core to change, and after sampling, the sample core needs to be processed twice, which is not conducive to the detection efficiency. Summary of the Invention

[0005] Based on this, in view of the problem of the large contact area between the current barrel drill and the sample core during sampling, it is necessary to provide a pile foundation sampling device for road and bridge construction.

[0006] The above object is achieved by the following technical solutions:

[0007] A pile foundation sampling device for road and bridge construction, comprising:

[0008] A cylinder frame, on which a driving disk is coaxially and rotatably arranged, and at least three milling cutter drills are rotatably arranged on the driving disk, and the three milling cutter drills are evenly distributed along the circumferential direction of the driving disk;

[0009] A driving component, which is used to drive the driving disk and the milling cutter drills to rotate around their own axes respectively;

[0010] A cover cylinder, which is located at the bottom of the cylinder frame, and the bottom of the cover cylinder is higher than the tops of the three milling cutter drills;

[0011] A cleaning roller, which is rotatably arranged on the driving disk, a roller brush is arranged on the outer periphery of the cleaning roller, the inside of the cleaning roller is hollow, and a negative pressure is formed inside the cleaning roller to adsorb debris.

[0012] Further, a rotating sleeve is coaxially and rotatably connected to the outer periphery of the drill pipe of the milling cutter drill bit. A belt pulley is coaxially and fixedly arranged on the outer periphery of the rotating sleeve. A limiting belt is wound around the three belt pulleys, and the inner surface of the limiting belt abuts against the outer surface of the sample core.

[0013] Further, a film covering assembly is arranged on the inner surface of the covering cylinder, and the film covering assembly can cover and seal the sample core entering the covering cylinder.

[0014] Further, the film covering assembly includes a film covering sleeve and a top plate. The film covering sleeve is coaxially and rotatably arranged on the inner circumference of the covering cylinder. The side wall of the film covering sleeve is filled with folded film. One end of the film is fixedly connected to the film covering sleeve. The top plate is axially slidably arranged on the inner circumference of the film covering sleeve, and the bottom of the top plate is fixedly connected to the other end of the film.

[0015] Further, a guiding telescopic rod is arranged inside the top plate and the covering cylinder, and an elastic member is arranged on the outer periphery of the guiding telescopic rod.

[0016] Further, the driving assembly includes a first driving motor and a second driving motor. The first driving motor is fixedly arranged inside the cylinder frame. The rotating shaft of the first driving motor is coaxially and fixedly connected to the driving disc. The second driving motor is coaxially and fixedly arranged at the bottom of the driving disc. The rotating shaft of the second driving motor is in belt transmission with the outer peripheries of the three milling cutter drill bits.

[0017] Further, transmission wheels are coaxially and fixedly arranged on the outer peripheries of the drill pipes of the three milling cutter drill bits, and a transmission belt is arranged between the outer periphery of the transmission wheel and the outer periphery of the rotating shaft of the second driving motor.

[0018] Further, a transmission gear is fixedly arranged on the outer periphery of the connecting shaft of the cleaning roller. A toothed ring is arranged on the inner side wall of the cylinder frame. The axis of the toothed ring coincides with the axis of the cylinder frame. The transmission gear meshes with the toothed ring.

[0019] Further, the upper end of the cylinder frame has a cavity. The upper end surface of the cavity has an opening. The opening is communicated with an air extraction pump. A filter screen is arranged on the opening. The connecting shaft of the cleaning roller is hollow and the top end is located inside the cavity.

[0020] Further, a holding handle is fixedly arranged on the upper end surface of the cylinder frame.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention adopts a milling cutter type drilling tool, which reduces the contact area compared with the traditional cylinder drill, makes the sampling accuracy higher, and the surface of the sample core smoother. Moreover, the roller brush of the cleaning roller is used to perform secondary treatment and cleaning on the surface of the sample core, which is convenient for subsequent sample core treatment and improves the detection efficiency.

[0023] In the present invention, a rotating sleeve, a belt pulley and a limiting belt are arranged on the outer periphery of the drill pipe of the milling cutter drill bit. The core samples are limited by a plurality of limiting belts, the limiting area is increased, the vibration of the core samples is reduced, and the stability is improved.

[0024] By arranging a film covering assembly in the cover cylinder in the present invention, the core samples can automatically cover the film after entering the cover cylinder, effectively blocking the long-term contact between the core samples and air, preventing the surface oxidation of the core samples, improving the protection effect, and ensuring the detection accuracy.

[0025] The cleaning roller of the present invention is driven by meshing with the gear ring, and rotates while revolving. The roller brush on its outer periphery can perform secondary grinding on the surface of the core samples and remove debris; the inside of the cleaning roller is hollow, and the connecting shaft is also hollow. Cooperating with the air extraction pump and the filter screen, it can effectively suck the drilling debris, reduce the dust, absorb part of the heat, and avoid damaging the air extraction pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a pile foundation sampling device for road and bridge construction provided by an embodiment of the present invention;

[0027] Figure 2 It is Figure 1 The front view of the pile foundation sampling device for road and bridge construction provided by an embodiment in

[0028] Figure 3 It is Figure 2 The sectional view taken along A-A of the pile foundation sampling device for road and bridge construction provided by an embodiment in

[0029] Figure 4 It is Figure 3 The partial enlarged view of part X of the pile foundation sampling device for road and bridge construction provided by an embodiment in

[0030] Figure 5 It is Figure 2 The sectional view taken along B-B of the pile foundation sampling device for road and bridge construction provided by an embodiment in

[0031] Figure 6 It is Figure 2 The sectional view taken along C-C of the pile foundation sampling device for road and bridge construction provided by an embodiment in

[0032] Figure 7 It is Figure 1 The top view of the pile foundation sampling device for road and bridge construction provided by an embodiment in

[0033] Figure 8 It is Figure 7 The sectional view taken along E-E of the pile foundation sampling device for road and bridge construction provided by an embodiment in

[0034] Figure 9 It isFigure 8 Partial enlarged view of part Y of the pile foundation sampling device for road and bridge construction provided by one embodiment;

[0035] Figure 10 Internal structure schematic diagram of the pile foundation sampling device for road and bridge construction provided by one embodiment of the present invention in the first state;

[0036] Figure 11 For Figure 10 Partial enlarged view of part Z of the pile foundation sampling device for road and bridge construction provided by one embodiment in the first state;

[0037] Figure 12 Internal structure schematic diagram of the pile foundation sampling device for road and bridge construction provided by one embodiment of the present invention in the second state;

[0038] Figure 13 For Figure 12 Partial enlarged view of part U of the pile foundation sampling device for road and bridge construction provided by one embodiment in the second state.

[0039] Wherein:

[0040] 100, cylinder frame; 110, holding handle; 120, cavity; 130, opening; 140, filter screen; 150, drive disk; 160, connection disk; 170, dust cover;

[0041] 200, milling cutter bit; 210, drill pipe; 220, rotating sleeve; 230, belt pulley; 240, limiting belt; 250, transmission wheel; 260, transmission belt; 270, limiting ring;

[0042] 300, cleaning roller; 310, connecting shaft; 320, transmission gear; 330, gear ring;

[0043] 400, cover cylinder; 410, film-covered sleeve; 420, receiving groove; 430, film; 440, top plate; 450, guiding telescopic rod; 460, elastic member; 470, connecting ear;

[0044] 500, first driving motor; 510, second driving motor;

[0045] 600, sample core. Detailed implementation manners

[0046] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] The serial numbers assigned to the components in this text itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The "connection" and "coupling" as used in this invention, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of this invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this invention.

[0048] In this invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0049] The following refers to Figures 1-13 to describe a pile foundation sampling device for road and bridge construction provided by this invention.

[0050] A pile foundation sampling device for road and bridge construction, which is applicable to the sampling of road pile foundations, includes a barrel frame 100. A driving disk 150 is rotatably arranged inside the barrel frame 100. Three milling cutter drill bits 200 are rotatably arranged on the driving disk 150. Specifically, the drill rods 210 of the three milling cutter drill bits 200 are rotatably connected to the driving disk 150. The three milling cutter drill bits 200 are evenly distributed along the circumference of the driving disk 150. The three milling cutter drill bits 200 are located at the bottommost part of the barrel frame 100. And a driving assembly is arranged on the barrel frame 100. The driving assembly can drive the driving disk 150 to rotate around its own axis and at the same time can drive the three milling cutter drill bits 200 to rotate around their own axes, so that the driving disk 150 drives the three milling cutter drill bits 200 rotating around their own axes to revolve. And the revolution trajectories of the three milling cutter drill bits 200 are circular, so as to be able to drill a cylindrical core sample 600. A cover barrel 400 is arranged at the bottom of the barrel frame 100. The bottom of the cover barrel 400 is higher than the tops of the three milling cutter drill bits 200. The three milling cutter drill bits 200 do not contact the cover barrel 400. As the barrel frame 100 is pressed down, the core sample 600 drilled by the three milling cutter drill bits 200 moves upward relative to the cover barrel 400. The cylindrical core sample 600 gradually enters the cover barrel 400. And a cleaning roller 300 is also rotatably arranged on the driving disk 150. The connecting shaft 310 of the cleaning roller 300 is rotatably connected to the driving disk 150. The cleaning roller 300 and the milling cutter drill bits 200 are in the same plane. A roller brush (not shown in the figure) is arranged on the outer circumference of the cleaning roller 300. The roller brush contacts the outer circumference of the core sample 600 at the bottom of the cover barrel 400. When the cleaning roller 300 rotates around its own axis, it can make the roller brush rub against the outer circumference of the core sample 600, so as to be able to polish and clean the outer circumference of the core sample 600 for the second time.

[0051] At the same time, the cleaning roller 300 in the present invention is hollow inside. There are through holes at the bottom of the cleaning roller 300. The bottom of the cleaning roller 300 is slightly higher than the bottom of the milling cutter drill bits 200, so that the cleaning roller 300 can suck up the debris generated during the sampling of the milling cutter drill bits 200, thereby reducing the dust phenomenon in the environment. And the suction force of the cleaning roller 300 can absorb a part of the heat generated when the milling cutter drill bits 200 drill the core sample 600.

[0052] It can be understood that by adopting a milling cutter type drilling tool in the present invention, compared with the traditional barrel drilling method, the contact area is reduced, the precision is higher, the surface of the core sample 600 is smoother, and the surface of the core sample 600 is further processed and cleaned by using the roller brush of the cleaning roller 300, which can make the subsequent processing of the core sample 600 more convenient and greatly improve the detection efficiency of the core sample 600.

[0053] Specifically, a rotating sleeve 220 is coaxially and rotatably connected to the outer circumference of the lower part of the drill rod 210 of the milling cutter drill bit 200 in this embodiment. Two bearings are arranged between the outer circumference of the drill rod 210 of the milling cutter drill bit 200 and the inner circumference of the rotating sleeve 220, such as Figure 3 andFigure 4 As shown, two bearings are respectively located at the upper and lower positions. Using bearing connection can improve the stability when the two rotate relative to each other. At the upper position of the outer periphery of the rotating sleeve 220, a belt pulley 230 is coaxially and fixedly sleeved. The same is true for the outer periphery of the drill rod 210 of each milling cutter drill bit 200. A limiting belt 240 is wound around the outer peripheries of the three belt pulleys 230, and the inner surface of the limiting belt 240 can contact the outer surface of the sample core 600 so as to stabilize the sample core 600 and reduce the vibration of the sample core 600.

[0054] It should be noted that, in order to further reduce the vibration of the sample core 600 in the present invention, three belt pulleys 230 are axially arranged on the outer periphery of the rotating sleeve 220 on the outer periphery of the drill rod 210. Limiting belts 240 are provided on the outer peripheries of the three belt pulleys 230, with a total of three limiting belts 240. The different heights of the three limiting belts 240 make the area where the sample core 600 is limited larger, so as to further improve the stability of the sample core 600.

[0055] In a further embodiment, a film covering assembly is provided in the cover cylinder 400 of the present invention. The film covering assembly can cover the sample core 600 entering the cover cylinder 400 with a film 430 to seal the sample core 600, preventing the surface of the sample core 600 from having an oxidation reaction due to long-term contact with the outside air and affecting the detection of the sample core 600.

[0056] Specifically, as Figure 10 、 Figure 11 、 Figure 12 and Figure 13 shown, the film covering assembly in this embodiment includes a film covering sleeve 410 and a top plate 440. The film covering sleeve 410 is coaxially and rotatably arranged on the inner periphery of the cover cylinder 400. An annular groove is provided on the inner periphery of the bottom of the cover cylinder 400, and the film covering sleeve 410 is rotatably connected in the annular groove. The outer periphery of the film covering sleeve 410 is in sliding contact with the bottom of the annular groove, so that the film covering sleeve 410 can rotate in the annular groove, but the film covering sleeve 410 cannot axially move relative to the annular groove. A receiving groove 420 is provided on the side wall of the film covering sleeve 410, and a folded film 430 is filled in the receiving groove 420. One end of the film 430 is fixed in the receiving groove 420, and the other end of the film 430 extends out of the receiving groove 420 and is connected to the top plate 440. The top plate 440 is axially slidably arranged on the inner periphery of the film covering sleeve 410. The top plate 440 can move axially along the film covering sleeve 410, and the bottom of the top plate 440 is connected to the film 430.

[0057] When the sample core 600 comes into contact with the top plate 440, under their mutual action, the sample core 600 exerts an upward thrust on the top plate 440, prompting the top plate 440 to move axially upward inside the cover cylinder 400. During the upward movement of the top plate 440, relying on its connection with the thin film 430, it pulls the thin film 430, causing the thin film 430 to gradually extend from the receiving groove 420 of the film sleeve 410. Finally, the thin film 430 completely covers the surface of the sample core 600, constructing an effective isolation barrier, effectively blocking the long-term contact between the sample core 600 and the air, and significantly improving the protection effect on the sample core 600.

[0058] Specifically, to ensure that the top plate 440 can move along the axial direction of the film sleeve 410, a guiding telescopic rod 450 is arranged inside the cover cylinder 400. The guiding telescopic rod 450 contains gas inside, and the gas can be compressed to have a telescopic function and is initially in an extended state. One end of the guiding telescopic rod 450 is fixed to the top end inside the cover cylinder 400, and the other end of the guiding telescopic rod 450 is fixed to the upper end of the top plate 440. When the push rod drives the top plate 440 to move upward, the guiding telescopic rod 450 will shorten synchronously, guiding the top plate 440 to move along the established axis.

[0059] A compression spring is sleeved outside the guiding telescopic rod 450 as the elastic member 460. The upper end of the elastic member 460 is fixed to the top end inside the cover cylinder 400, and the lower end abuts against the top end of the top plate 440. In the initial state, the elastic member 460 maintains its original length. As the top plate 440 moves up and down, the elastic member 460 expands and contracts accordingly, which can not only buffer the impact force during the movement of the top plate 440 but also help the top plate 440 to reset.

[0060] It should be noted that due to the certain length of the guiding telescopic rod 450 arranged inside the cover cylinder 400, the limit distance of the axial upward movement of the top plate 440 inside the cover cylinder 400 will be affected by the guiding telescopic rod 450, resulting in the sample core 600 not being completely covered by the thin film 430. Therefore, in the present invention, the upper end of the guiding telescopic rod 450 is slidably arranged at the top of the cover cylinder 400, so that one end of the guiding telescopic rod 450 can slide out of the cover cylinder 400, thereby reducing the influence of the length of the guiding telescopic rod 450 on the limit distance of the upward movement of the top plate 440 inside the cover cylinder 400. That is to say, when the top plate 440 moves upward inside the cover cylinder 400, the upper end of the guiding telescopic rod 450 can move upward at the top of the cover cylinder 400. When the upper end moves to the limit distance, the guiding telescopic rod 450 begins to shorten, enabling the top plate 440 to move a greater distance upward inside the cover cylinder 400.

[0061] Specifically, as Figure 10 and Figure 12As shown in the figure, a guiding cylinder is provided at the top of the cover cylinder 400. The bottom of the guiding cylinder communicates with the cover cylinder 400. The upper end of the guiding telescopic rod 450 can be accommodated inside the guiding cylinder. When the guiding telescopic rod 450 moves upward, it can enter the guiding cylinder through the guiding of the guiding cylinder.

[0062] In this embodiment, the cover cylinder 400 is arranged to be able to slide along the axial direction of the cylinder frame 100. Three connecting ears 470 are fixedly arranged on the outer periphery of the cover cylinder 400. The three connecting ears 470 are slidably sleeved on the outer periphery of the drill rod 210 of the milling cutter drill bit 200, so that the cover cylinder 400 can move along the axial direction of the cylinder frame 100. And a limiting ring 270 is arranged on the outer periphery of the rotating sleeve 220 on the outer periphery of the drill rod 210 of the milling cutter drill bit 200, so as to limit the distance of the upward movement of the cover cylinder 400 in the axial direction. As Figure 3 、 Figure 10 and Figure 12 shown, in the initial state, the lower end of the cover cylinder 400 is closest to the top end of the milling cutter drill bit 200. When the milling cutter drill bit 200 starts to drill the sample core 600, the top end of the sample core 600 will abut against the top plate 440 and move upward. Since there is an elastic member 460 between the top plate 440 and the cover cylinder 400, the sample core 600 will first push the entire cover cylinder 400 to move upward. When the three connecting ears 470 on the cover cylinder 400 move to contact the limiting ring 270, the upward movement stops. At this time, the top plate 440 starts to compress the elastic member 460, and the top plate 440 starts to move upward relative to the cover cylinder 400, thereby gradually covering the thin film 430 inside the cover cylinder 400 on the outer periphery of the sample core 600, avoiding the sample core 600 from contacting the air for a long time.

[0063] In a further embodiment, the drive assembly in the present invention includes a first drive motor 500 and a second drive motor 510. The first drive motor 500 is firmly anchored to the top end of the cylinder frame 100 by means of a suitable mounting base. Its output rotating shaft is coaxially and rigidly fixed to the central part of the drive disk 150 through a high concentricity connection process. When the first drive motor 500 receives a start command, according to the motor operation principle, the output rotating shaft takes the drive disk 150 as a load and drives it to perform a fixed-axis rotation movement around its own axis. Driven by the drive disk 150, the three milling cutter drill bits 200 mechanically connected thereto synchronously perform a circular orbit revolution movement, and the drilling operation of the target sample core 600 is realized by virtue of this movement mode.

[0064] The second drive motor 510 is accurately installed at the geometric center position at the bottom of the drive disk 150 through specific tooling positioning. A transmission wheel 250 is coaxially assembled on the outer circumferential surface of the drill rod 210 of each milling cutter drill bit 200 by means of reliable fixing methods such as key connection. According to the mechanical transmission principle, as Figure 5As shown, a drive belt 260 successively surrounds the inner circumferential surfaces of three drive wheels 250 according to a predetermined winding rule, and forms a reliable friction drive connection with the outer circumferential surface of the output rotating shaft of the second drive motor 510. When the second drive motor 510 is started, the output rotating shaft drives the drive belt 260 to perform a circular motion by virtue of the frictional force between the drive belt 260, and then synchronously transmits the rotational driving torque to the three drive wheels 250, driving the milling cutter drill bit 200 to perform a synchronous self-rotation motion, providing cutting power for the core 600 drilling operation.

[0065] Specifically, a dust-proof cover 170 is provided on the second drive motor 510 in this embodiment. The dust-proof cover 170 can effectively block external dust, powder and other impurities from entering the interior of the second drive motor 510, preventing dust from accumulating on components such as the motor winding and iron core, thereby reducing problems such as poor heat dissipation and decreased insulation performance caused by dust accumulation, and extending the service life of the motor.

[0066] In a further embodiment, to endow the cleaning roller 300 with a rotating function, a transmission gear 320 is coaxially and fixedly installed on the outer circumference of the connecting shaft 310 of the cleaning roller 300 by reliable means such as key connection or interference fit. A toothed ring 330 is provided on the inner wall of the cylinder frame 100. The axis of the toothed ring 330 coincides with the axis of the cylinder frame 100 and forms a meshing transmission relationship with the transmission gear 320.

[0067] Since the cleaning roller 300 is rotatably installed on the driving disk 150, when the driving disk 150 starts to rotate driven by the first drive motor 500, the cleaning roller 300 revolves around the central axis of the cylinder frame 100. Because the transmission gear 320 is installed on the connecting shaft 310 of the cleaning roller 300 and the toothed ring 330 is fixed on the inner wall of the cylinder frame 100, during the revolution of the cleaning roller 300, the transmission gear 320 and the toothed ring 330 are continuously meshed. According to the principle of gear meshing transmission, the cleaning roller 300 will rotate around its own axis while revolving. This motion characteristic enables the roller brush on the outer circumference of the cleaning roller 300 to perform secondary grinding on the surface of the core 600 and effectively remove debris and other impurities on the surface of the core 600.

[0068] It should be noted that to ensure the smooth rotation of the cleaning roller 300 and the milling cutter drill bit 200, a connecting disk 160 is also rotatably provided in the cylinder frame 100. There are three cleaning rollers 300 in this embodiment, so six rotating holes are provided on the connecting disk 160. The six rotating holes are paired in twos. The drill rods 210 of the three milling cutter drill bits 200 respectively pass through three of the rotating holes, and the connecting shafts 310 of the three cleaning rollers 300 respectively pass through the other three rotating holes. When the driving disk 150 rotates, it can drive the connecting disk 160 to rotate through the connecting shafts 310 of the three cleaning rollers 300 and the drill rods 210 of the three milling cutter drill bits 200. The connecting disk 160 makes the rotation of the cleaning roller 300 and the milling cutter drill bit 200 smoother.

[0069] In a further embodiment, to enable the cleaning roller 300 to suck impurities, the connecting shaft 310 of the cleaning roller 300 is set to be hollow, and a cavity 120 is provided at the upper end of the cylinder frame 100. The top of the cavity 120 has an opening 130, and the opening 130 is connected to an air extraction pump (not shown in the figure). A filter screen 140 is provided on the opening 130. The top of the connecting shaft 310 of the cleaning roller 300 is also located in the cavity 120. When the air extraction pump is started, a negative pressure is formed in the cavity 120, so that a negative pressure is also formed inside the cleaning roller 300, thereby being able to suck the debris generated when the milling cutter drill bit 200 drills the sample core 600 into the cavity 120. The setting of the filter screen 140 can prevent impurities from entering the air extraction pump and damaging the air extraction pump.

[0070] Specifically, as Figure 3 shown, the driving disk 150 in the present invention is rotationally and sealingly connected in the cylinder frame 100. A cavity 120 is formed between the driving disk 150 and the top end of the cylinder frame 100. The top end of the connecting shaft 310 of the cleaning roller 300 passes through the driving disk 150 and is located in the cavity 120. The hollow of the connecting shaft 310 enables the inside of the cleaning roller 300 to communicate with the cavity 120 as well. Therefore, when a negative pressure is formed in the cavity 120, the cleaning roller 300 can adsorb debris through the hollow connecting shaft 310 and suck the debris into the cavity 120. To facilitate the rotational connection of the connecting shaft 310 of the cleaning roller 300 on the driving disk 150, two bearings are also provided at the connection between the connecting shaft 310 of the cleaning roller 300 and the driving disk 150. One of the two bearings, the lower end face of the upper bearing, abuts against the upper end face of the driving disk 150, and the upper end face abuts against the nut above the connecting shaft 310 of the cleaning roller 300; similarly, the upper end face of the lower bearing abuts against the lower end face of the driving disk 150, and the lower end face abuts against the nut below the connecting shaft 310 of the cleaning roller 300.

[0071] Specifically, two holding handles 110 are fixedly provided at the top of the cylinder frame 100 in the present invention. During the core sampling operation, the operator moves the cylinder frame 100 through the two holding handles 110 and applies a force to the holding handles 110, so that the cylinder frame 100 has a tendency to move downward, and further enables the three milling cutter drill bits 200 to revolve in a circular trajectory and rotate around their own axes while being able to move downward to gradually drill the sample core 600.

[0072] Combined with the above embodiments, the specific working process of a pile foundation sampling device for road and bridge construction provided by the present invention is described as follows:

[0073] Place the pile foundation sampling device for road and bridge construction at the designated position. The operator firmly holds the handle 110 and presses downwards, and starts the first driving motor 500 and the second driving motor 510. The first driving motor 500 drives the driving disk 150 to rotate around its own axis. The driving disk 150 then drives the three milling cutter drill bits 200 and the three cleaning rollers 300 to revolve around the axis of the driving disk 150. And because the transmission gear 320 on the outer circumference of the connecting shaft 310 of the cleaning roller 300 meshes with the gear ring 330 in the barrel frame 100, the connecting shaft 310 of the cleaning roller 300 drives the cleaning roller 300 to rotate around its own axis. The second driving motor 510 drives the drill pipes 210 of the three milling cutter drill bits 200 to rotate synchronously through the transmission belt 260 and the transmission wheel 250. The three milling cutter drill bits 200 rotate at high speed around their own axes to start drilling the sample core 600.

[0074] During the process of drilling the sample core 600, when the cleaning roller 300 rotates around its own axis, the roller brush on its outer circumference can secondarily polish the outer circumference of the sample core 600. And start the air extraction pump (not shown in the figure). When the air extraction pump extracts air, a negative pressure is formed in the cavity 120. The upper end of the connecting shaft 310 of the cleaning roller 300 is located in the cavity 120. So the bottom of the cleaning roller 300 can suck air to suck the debris drilled by the three milling cutter drill bits 200 into the cavity 120. The filter screen 140 at the top end of the cavity 120 can prevent the debris from damaging the air extraction pump.

[0075] As the length of the sample core 600 gradually increases, the outer circumference of the sample core 600 will be limited by the three limiting bands 240, so that the sample core 600 can stably enter the cover cylinder 400. After the sample core 600 enters the cover cylinder 400, it contacts the top plate 440. As the sample core 600 moves upward, the sample core 600 can push the cover cylinder 400 to move upward synchronously. When the cover cylinder 400 moves until the three connecting ears 470 contact the limiting ring 270, it stops moving upward. The top plate 440 starts to compress the elastic member 460. The top plate 440 axially moves upward relative to the film covering sleeve 410 in the cover cylinder 400. Since the film covering sleeve 410 is rotatably arranged on the inner circumference of the cover cylinder 400, the film covering sleeve 410 and the top plate 440 can be stationary in the circumferential direction relative to the sample core 600, while the film covering sleeve 410 and the top plate 440 rotate circumferentially relative to the cover cylinder 400. So that the top plate 440 can smoothly pull out the film 430 inside the film covering sleeve 410 to cover the outer circumference of the sample core 600. After the core sampling is completed, a layer of film 430 covers the outer circumference of the sample core 600 to reduce the long-term contact between the surface of the sample core 600 and the outside air, thus avoiding affecting the subsequent detection accuracy of the sample core 600.

[0076] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0077] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A pile foundation sampling device for road and bridge construction, characterized in that: include: A cartridge rack, on which a drive disc is coaxially and rotatably arranged, on which at least three milling cutter bits are rotatably arranged, and the three milling cutter bits are evenly distributed along the circumference of the drive disc; A driving assembly, the driving assembly is used to drive the driving disc and the milling cutter drill bit to rotate around their own axes respectively; A cover cylinder, wherein the cover cylinder is located at the bottom of the cylinder frame, and the bottom of the cover cylinder is higher than the tops of the three milling cutter bits; A cleaning roller is rotatably arranged on the driving disk, a roller brush is arranged on the periphery of the cleaning roller, the interior of the cleaning roller is hollow, and negative pressure is formed inside the cleaning roller for absorbing debris.

2. The pile foundation sampling device for road and bridge construction according to claim 1, characterized in that: The drill rod of the milling cutter drill bit is coaxially and rotatably connected to a rotating sleeve, the rotating sleeve is coaxially and fixedly provided with a pulley on its outer periphery, and limiting belts are wound around three pulleys, and the inner surface of the limiting belts abuts against the outer surface of the sample core.

3. The pile foundation sampling device for road and bridge construction according to claim 1, characterized in that: The inner surface of the cover cylinder is provided with a film covering component, and the film covering component can cover and seal the sample core entering the cover cylinder.

4. The pile foundation sampling device for road and bridge construction according to claim 3 is characterized in that: The coating assembly includes a coating sleeve and a top plate. The coating sleeve is coaxially and rotatably arranged on the inner periphery of the cover sleeve. The side wall of the coating sleeve is filled with a folded film. One end of the film is fixedly connected to the coating sleeve. The top plate is axially slidably arranged on the inner periphery of the coating sleeve. The bottom of the top plate is fixedly connected to the other end of the film.

5. The pile foundation sampling device for road and bridge construction according to claim 4, characterized in that: A guiding telescopic rod is arranged inside the top plate and the cover tube, and an elastic member is arranged on the outer periphery of the guiding telescopic rod.

6. The pile foundation sampling device for road and bridge construction according to claim 1, characterized in that: The driving assembly includes a first driving motor and a second driving motor. The first driving motor is fixedly arranged in the drum frame. The rotating shaft of the first driving motor is coaxial with and fixedly connected to the driving disk. The second driving motor is coaxially and fixedly arranged at the bottom of the driving disk. The rotating shaft of the second driving motor is driven by the peripheral transmission belts of three milling cutter drill bits.

7. The pile foundation sampling device for road and bridge construction according to claim 6, characterized in that: The outer circumferences of the drill rods of the three milling cutter drill bits are coaxially and fixedly provided with transmission wheels, and the outer circumferences of the transmission wheels and the outer circumference of the rotating shaft of the second driving motor are provided with transmission belts.

8. The pile foundation sampling device for road and bridge construction according to claim 6, characterized in that: A transmission gear is fixedly arranged on the outer periphery of the connecting shaft of the cleaning roller, a gear ring is arranged on the inner side wall of the cartridge frame, the axis of the gear ring coincides with the axis of the cartridge frame, and the transmission gear meshes with the gear ring.

9. The pile foundation sampling device for road and bridge construction according to claim 8, characterized in that: The upper end of the drum frame has a cavity, the upper end surface of the cavity has an opening, the opening is connected to an air pump, a filter is arranged on the opening, the connecting shaft of the cleaning roller is hollow and the top end is located in the cavity.

10. The pile foundation sampling device for road and bridge construction according to claim 1, characterized in that: A holding handle is fixedly arranged on the upper end surface of the cartridge frame.

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